Synchronization/reference pulse-based powerline pulse position modulated communication system
A transmitting controller is connected to a powerline and on command places a reference signal and a series of signal pulses in the powerline at a series of signal timing positions related to zero voltage crossing points so that the signals pulses are substantially in the powerline temporal quiet zone. The receiving controller is connected to the powerline and has a filter circuit therein which filters away the powerline AC signal and noise to leave the reference and signal pulses. The signal pulses are compared to the position of starting reference pulses to determine in which signal timing position the pulses have occurred. Digital data is communicated over the powerline in accordance with the nature placement of the data pulses related to the reference pulse positions. The timing zone for transmission and signals is preferably about 500 to about 1000 microseconds away from zero voltage crossing.
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This invention is a continuation-in-part of my prior application Ser. No. 09/656,160 entitled “POWERLINE PULSE POSITION MODULATED COMMUNICATION APPARATUS AND METHOD”, filed Sep. 6, 2000.
FIELD OF THE INVENTIONThis invention is directed to an apparatus which enables digital communication between two or more devices wherein the devices are connected to the same powerline and use the same powerline to receive power and as a physical channel for electronic intercommunication.
BACKGROUND OF THE INVENTIONThere are devices which are more conveniently used if they can be remotely controlled. In a household, such devices are mostly appliances and lighting loads. The appliances and lighting loads may be remotely controlled for a number of different reasons. For example, for night security, some lights may be controlled by a timer. In other cases, different lighting intensity and different lighting distribution may be desirable in a single room, depending upon its use. The room may be used for reading, conversation or watching displays, such as television. Each suggest a different lighting level and different lighting distribution. Normally, people do not make such changes because it is inconvenient to do so. Unless there is a convenient way to accomplish it, such adjustment of the lighting system is rarely done. Therefore, it is desirable to have a convenient, reliable way to remotely control lighting systems.
In addition to lighting systems, other devices can be conveniently remotely controlled. For example, powered gates and garage doors can be remotely controlled. An electric coffee pot may be turned on at an appropriate morning hour. Powered draperies may be opened and closed, depending upon sun altitude.
As electronic technology has advanced, inventors have produced a variety of control systems capable of controlling lighting and other electric loads. In order to be useful as a whole-house lighting control system, there are certain requirements that must be met. A system must permit both small and large groups of lights to be controlled on command. The problem is the connection between the controller and the lighting load. Such connection may be hard-wired, but such is complex and very expensive to retrofit into an existing home. Another connection system may operate at radio frequency, but this has proven difficult to implement because the FCC requires low signal levels which are subject to interference and because the transmission and receiving circuitry is complex and expensive.
It must be noted that both the controller and the load to be controlled are connected to the same powerline. It would be useful to use the powerline as the communication-connecting channel. Prior powerline communication schemes have had difficulties employing the powerline as a communication channel because the communication signals after being attenuated by the powerline circuitry are very small compared to the background noise. It is impossible to avoid the fact that between certain locations in a residence there will be very high attenuation of any transmitted signals. It has been difficult to reliably separate the highly attenuated communication signals from the background noise on the powerline.
The situation is further aggravated and complicated by the fact that the noise and attenuation parameters are constantly and unpredictably changing as loads are connected and disconnected both inside the primary residence and inside any of the many neighboring residences attached to the same mains power transformer. In reality the powerline circuit used for communication in a residence includes all the residences attached to the mains power transformer. There is no practical way to avoid the complications caused by this fact.
SUMMARY OF THE INVENTIONIn order to aid in the understanding of this invention, it can be stated in essentially summary form that it is directed a powerline pulse position modulated communication apparatus and method. The transmitting portion of the apparatus senses the zero voltage crossing point in the powerline and transmits a series of signal pulses at a set of specified positions, the position of the data pulse relative to the starting reference pulses representing digital data in the form of a digital number. The set of all possible relative positions is in the quiet zone adjacent, but spaced from the main voltage zero crossing point. The receiving circuit also senses the voltage zero crossing point and can reliably detect the signal pulse in the background powerline noise because of the knowledge of where the signal pulse is expected in the quiet zone adjacent, but away from the zero crossing point and because of the high magnitude of the very robust signal pulse even after significant residential attenuation. After determining in which one of the possible relative positions the signal pulse was located, the associated digital data in the form of a digital number is easily determined. Thus digital data is communicated from one device through the powerline to another device using this method of powerline pulse position modulation.
It is a purpose and advantage of this invention to provide a method and apparatus for reliable communication of digital data over the powerline by means of a powerline pulse position modulation communication method.
It is a further purpose and advantage of this invention to provide a method and apparatus for powerline pulse communication wherein the voltage zero crossing is sensed and the communication signal pulse is transmitted and sensed in a receiver based on the signal position relative to the starting point of the previous pulse.
It is a further purpose and advantage of this invention to provide a method and apparatus by a powerline pulse position modulation communication method for the purpose of remote electrical load control.
It is a further purpose and advantage of this invention to provide a method and apparatus wherein the voltage zero crossing is sensed, and digital pulse windows are defined with respect to the zero voltage crossing, but spaced from the zero voltage crossing so as not to interfere with zero voltage crossing equipment.
It is a further purpose and advantage of this invention to provide a method and apparatus by a powerline pulse position modulation communication method for the purpose of remotely retrieving operational data from residential appliances.
It is a further purpose and advantage of this invention to provide a method and apparatus by a powerline pulse position modulation communication method for the purpose of remotely controlling residential loads for utility company energy management.
It is another purpose and advantage of this invention to provide a powerline pulse position modulated communication apparatus and method which complies with FCC regulations relating to apparatus which is connected to and communicating on the powerline.
The features of this invention which are believed to be novel are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages thereof, may be best understood by reference to the following description, taken in conjunction with the accompanying drawings.
The purpose of the powerline pulse position modulated communication apparatus of this invention as shown in
Lighting Control System
A lighting control system as shown in FIG. 2 and
In
Also connected to the powerline 18 and neutral 14 are lighting load receiving controllers 20, 22 and 24. These receiving controllers are respectively connected to loads 26, 28 and 30. The loads are electric lights, in this example, but may be heater or motor loads as described above. Furthermore, the receiving controllers 20, 22 and 24 are capable of receiving digital commands which change the supply of power to the loads and may supply different levels of power to the loads to control the brightness of the lighting load. The transmitting controller 10 emits its digital commands into the powerline 18 for transmission to the receiving controllers 20, 22 and 24 by pressing one or more of the command buttons 32, 34 and 36 on transmitting controller 10. Thus, the receiving controllers 20, 22 and 24 receive digital commands from the transmitting controller 10 to control the loads 26, 28 and 30, respectively. No separate wiring or radio frequency communication is required, but the transmitting controller places signals in the powerline 18. Such transmitted signals are coded so that they can be detected by all of the receiving controllers.
A similar arrangement is seen in
In addition, transmitting master controller 44 is connected to the powerline. It is identical to the transmitting controllers 10, 38, 40 and 42, but it is programmed differently to send out digital data signals which command receiving controllers to control their loads individually. The fact that transmitting controller 44 is connected only between powerline 18 and neutral 14 does not interfere with its ability and function to send signals to receiving controllers connected between powerline 16 and neutral 14.
Transmission and Receiving Circuit Operation
The transmitting controllers 10 and the receiving controllers 20 are identical, in the sense that they contain the same transmitting and receiving circuitry. They are programmed differently so as to achieve the desired different results. The controller 10 is schematically illustrated in FIG. 1. It has a transmitting circuit 46, which is connected to powerline 16 through line 48 and to neutral through line 49. The transmitting circuit comprises triac 50 which is connected in series with energy storage capacitor 52. Inductor 54 is also in the series connection between line 48 and capacitor 52. Capacitor 56 forms a low pass filter with inductor 54 to minimize high frequency emissions so that the transmitter meets the FCC requirements. Triac 50 is controlled by line 58 which is the output from digital control integrated circuit 60. Hereinafter, the conventional abbreviation “IC” will be used in place of the term “integrated circuit.” When the digital control IC sends an appropriate firing signal on line 58, the triac fires and puts a pulse in line 16 with respect to the neutral 14.
Controller 10 also contains a receiver circuit 62. The important components of the receiver circuit 62 form a band pass filter circuit. This includes capacitor 66, capacitor 68, capacitor 76, inductor 70, inductor 74 and inductor 64. Resistor 72 limits the current through the circuit. Resistor 78 is connected in series to limit the current in signal line 80. This circuit filters the signal pulse out of the powerline 60 cycle voltage and background noise.
Signal line 80 is connected into digital control IC 60 as its signal input. As a particular example, digital control IC 60 is a microprocessor Microchip model PIC16C622. The input signal line 80 is connected between two clipping diodes 82 and 84 to protect the digital control IC 60 from excessively high and low voltages. The signal input line 80 is connected to comparator 86 where the signal voltage is compared to internal voltage reference 88. The voltage reference 88, which is adjustable by the digital control IC 60 allows the digital control IC 60 to automatically adjust the receiving signal level to be set above the noise level. This is a form of automatic gain control which is essential so that the digital control IC 60 can discriminate between noise and real signal pulses. The comparator output 90 carries the received digital signal to the internal processing circuitry of the digital control IC.
There are additional inputs to the digital control IC 60. Zero crossing detector 92 is connected to powerline 16 and neutral 14. It has an output to the digital control IC 60. Power supply 94 supplies power to the digital control IC and to the EEPROM memory 96. There may be a plurality of the input switches, one of which is indicated at 98, for causing the digital control IC 60 to perform some internal operation or to issue transmitted commands. The commands of switch 98 correspond to the command buttons 32, 34 and 36 seen in FIG. 2. It is desirable that there be some method of visual feedback to the user for a variety of programming and control uses. This is provided by indicator light 100, which may be energized by the digital control IC 60. When the controller 10 is acting as a receiver load controller, it has an output circuit which controls the load. This output device 102 is in the form of a relay, triac, or the like. It controls the flow of power from line 16 to the load 104.
Pulse Position Modulation of Digital Data
Transmitter Operation
In
In the current embodiment of the invention the first two pulses in any message are special reference pulses placed in predetermined fixed positions. These reference pulses do not encode any data. All following data pulses are referenced as to the reference pulse positions.
Each pulse after the first two synchronization pulses represents one transmitted data number. The number transmitted can range from 1 to N where N is the total number of possible positions of one pulse. In
In order that the receiver may know the exact position of the signal pulses relative to the transmitter, a pair of start pulses or reference pulses is transmitted at the beginning of each series of data pulses, see FIG. 9. These two pulses will be referred to as reference pulses or Reference A and Reference B pulses. These reference pulses do not carry data but serve to establish a reference time for the determination of the position of the following data pulses.
The reason there are two reference pulses is that the pulses generated by discharging a positively charged capacitor appear differently to the receive circuit and digital control IC than the pulses generated by discharging a negatively charged capacitor.
Because the receive circuit only can sense positive voltage only, relative to ground, only the positive pulses such as 222, 224 and 228 can be sensed. An example is positive pulse 204 shown in FIG. 10.
The same logic applies to pulses of Type B where the first wave 230 is negative and the second wave 228 is positive. Only the second wave 208 can be sensed by the comparator. This pulse at 228, 230, 208, and 210 is called a Type B pulse and if it is a Reference pulse it is called Reference B Pulse.
This phenomenon leads to the fact that on positive half cycles the receive circuit senses the first wave of a pulse, and on the negative half cycles the receive circuit senses the second wave of a pulse. The time difference caused by this phenomenon produces a fixed offset in the time of pulse arrival sensed by the digital control IC that is equal to the width of the first wave. Since this offset is stable and fixed it is very simple for the digital control IC to measure this difference and then compensate for it throughout the series of data pulses.
This phenomenon is shown as a 10uS difference in FIG. 10. The two reference pulses are transmitted by the transmitter at exactly 8333uS apart so that he receiver can measure the difference between the received pulses. This difference or offset remains the same throughout the transmission, appearing as a fixed offset on every other half cycle.
When a powerline pulse is desired, the first need is to charge the capacitor 52 in FIG. 1. Before the initial charging the initial charge stale of the capacitor 52 is unknown. The digital control IC puts an initial trigger pulse 106, see
It is the position of the data pulse relative to the reference pulse, which determines what digit has been encoded in that pulse. In the example in
Because only one pulse can be produced every half cycle, the pulse may be placed in only one of the sixteen positions. If there are 16 possible positions then one and only one of the digits 0 to 15 may be encoded by the position of the pulse. If the pulse is located in position #3 as shown as 134 cycle T7 in
The two pulses 130 and 132 in cycles T5 and T6 are the reference pulses and are both located in position 0. Because they are used to establish the reference points for all following data pulses, there position is by definition position number 0.
Since only one pulse can be transmitted per half cycle with this circuit design, one and only one number can be transmitted each half cycle. The reason this method of modulating data is called “pulse position modulation” herein is because the value of the data is encoded in the position of the pulse.
Because of attenuation, background noise, and other periodic and intermittent random pulses present on the powerline, these signal pulses would ordinarily be difficult to detect. However, in accordance with this invention, when the pulse is located near the zero voltage crossing point for the power voltage wave, there is a quiet zone in the powerline voltage waveform in which the signal pulse can be more reliably detected.
To summarize, there are four primary reasons the area from 1000 uS to 500 uS before zero crossing is selected for our transmission period. First, because a relatively large pulse is generated because the capacitor is charged to a large voltage. Second, because there is a relatively uniform voltage from the beginning of this period to the end of this period. Third, because there is little interference caused by the communication pulses to devices that utilize the powerline zero crossing for various purposes, such as clocks or light dimmers. Fourth, because there is very little noise from pulse producing devices, such as light dimmers, during this period.
Receiver Operation
The manner of operation of this receiving circuit 62 in
These times, shown as X1 and X2, which are the positions of the two starting reference pulses, are placed at the beginning of the quiet zone and define for the following data pulses the reference position. The reference pulse 150 is timed from the previous zero crossing 105 and is set to be about 1024 microseconds before the next zero crossing 107. Since it is not desired to use the about 500 microseconds before zero crossing 107, that space is left free of signals.
These times, shown as X3 and X4 in
In
The method of calculating the data from the time period after which a data pulse follows a reference pulse is very straightforward. For example the pulse 142 follows the reference pulse 130 by the time X7. If the reference pulse 130 is in data position 0 then the data encoded in pulse 142 is (X7−3*16666 msec)/32 msec. This is assuming the data positions are each 32 msec wide.
This is the fundamental method of transmitting and receiving numerical data. This series of numerical data is stored in the Digital control IC and processed according to the application program requirements. If the device is a lighting controller, the data would most likely represent lighting system addresses and command instructions. Other applications would have other meanings for the decoded data. Some application devices such as a powerline modem might use the invention for pure communication of data and may not have a specific application function.
This invention has been described in its presently contemplated best embodiment, and it is clear that it is susceptible to numerous modifications, modes and embodiments within the ability of those skilled in the art and without the exercise of the inventive faculty. Accordingly, the scope of this invention is defined by the scope of the following claims.
Claims
1. A powerline pulse position modulated communication transmitter comprising:
- first and second connections for connecting to an AC powerline;
- a chargeable capacitor and a switch in series therewith coupled to said first and second connections for connection in parallel to the powerline;
- a digital control integrated circuit;
- a zero voltage crossing detector circuit coupled to said first and second connections and to said digital control integrated circuit;
- a signal source to actuate said digital control integrated circuit, said digital control integrated circuit being coupled to said switch in series with said capacitor to actuate said switch in a series of half cycles of the AC powerline in order to produce a series of pulses in said series of half cycles;
- said pulses comprising at least one preliminary synchronization reference pulse referenced to the zero crossing time followed at least one half cycle later by one or more data pulses which are within about 1,000 microseconds of a following zero crossing in which each data pulse encodes a binary number determined by the relative position of said data pulse to said preliminary synchronization reference pulse;
- said digital control integrated circuit being coupled to said switch in series with said capacitor to actuate said switch in one of a predetermined number of a plurality of signal time positions referenced to said reference pulse position in the powerline to discharge said capacitor into the powerline to produce a data pulse in the powerline at said one of said signal time positions.
2. The powerline pulse position modulated communication transmitter of claim 1 wherein there is a memory connected to said digital control integrated circuit, said memory being organized to cause said digital control integrated circuit to provide an appropriate series of said signal pulses representing digitally encoded data in response to said signal source to actuate said digital control integrated circuit.
3. The powerline pulse position modulated communication transmitter of claim 1 wherein said switch in series with said capacitor is a triac and said triac is connected to be actuated by said transmitting digital control integrated circuit so that said triac permits charging of said capacitor in either polarity of the powerline.
4. The powerline pulse position modulated communication transmitter of claim 3 wherein said digital control integrated circuit is programmed to actuate said triac to permit charging of said capacitor before signal pulses are desired, in order to have a charge on said capacitor when an actuating pulse actuates said triac to cause a signal pulse in the powerline in a selected signal position.
5. The powerline pulse position modulated communication transmitter of claim 1 wherein said digital control integrated circuit senses voltage zero crossing in the powerline and emits actuating pulses to said switch to cause one or more reference pulses at timing positions within a predetermined time range within the quiet zone prior to the zero crossing time.
6. The powerline pulse position modulated communication transmitter of claim 5 wherein said digital control integrated circuit reference pulse positions in the powerline and emits actuating pulses to said switch to cause one or more data pulses at timing positions within a predetermined time range prior to the zero crossing time.
7. The powerline pulse position modulated communication transmitter of claim 6 wherein there are at least four signal timing positions prior to zero crossing.
8. The powerline pulse position modulated communication transmitter of claim 1 wherein said transmitter is one of two controller parts of a system, both said controller parts being connectable to the same powerline for communication therebetween on the powerline, said system comprising two controllers, one acting as said transmitting controller and the other acting as a receiving controller, each said transmitting controller and said receiving controller respectively containing a transmitting digital control integrated circuit and a receiving digital control integrated circuit and each having a zero voltage crossing detector circuit connected thereto, and each said controller having both a transmitting circuit and a receiving circuit so that either said controller can act as a transmitting controller or as a receiving controller, utilizing the same digital control integrated circuit.
9. The powerline pulse position modulated communication system of claim 8 wherein each said controller has a transmitting circuit comprised of a triac serially connected to a capacitor, said serially connected triac and capacitor being coupled to the powerline, said triac being coupled to be controlled by said digital control integrated circuit; and
- each said apparatus having a receive circuit comprising a filter circuit for connection to the powerline, said filter having an output signal line connected to said digital control integrated circuit so that said digital control integrated circuit can detect the timing of a signal pulse with respect to the zero voltage crossing.
10. The powerline pulse position modulated communication system of claim 9 wherein a memory is connected to said digital control integrated circuit, said memory being programmed to define signal timing positions prior to and spaced from zero crossing so that said transmitting digital control integrated circuit can transmit a one or more reference pulses to the powerline at a selected signal timing positions when acting as a transmitter, and said receiving digital control integrated circuit can determine at which signal timing position a reference signal pulse occurs when said apparatus is acting as a receiving controller.
11. The powerline pulse position modulated communication system of claim 9 wherein a memory is connected to said digital control integrated circuit, said memory being programmed to define signal timing positions prior to and spaced from zero crossing so that said transmitting digital control integrated circuit can transmit a one or more data pulses to the powerline at a selected signal timing positions related to the position of said reference pulses in when acting as a transmitter, and said receiving digital control integrated circuit can determine at which signal timing position a data signal pulse occurs relative to said reference pulse when said apparatus is acting as a receiving controller.
12. The powerline pulse position modulated communication system of claim 1 wherein there is an output driver connected to said digital control integrated circuit, said output driver being connectable to a load so that said output driver can be actuated to energize the load.
13. A powerline pulse position modulated communication system comprising:
- a transmitter, first and second connections for connecting said transmitter to an AC powerline, said transmitter having a zero voltage crossing detector connected to said connections, said transmitter having a circuit for producing a pulse;
- a signal source connected to said circuit to actuate said transmitter circuit so as to produce a reference pulse in the powerline at reference pulse position which is in one of a plurality of signal time positions relative to the zero crossing time and said signal source being actuated to produce a plurality of subsequent data pulses in one of said plurality of signal time positions away from zero crossing and within about 1000 microseconds of zero crossing prior to subsequent powerline zero crossings, said subsequent pulses being in selected signal time positions referenced to and following said reference pulse; and
- a receiver having first and second connections for connecting to the same AC powerline, a zero voltage crossing detector in said receiver connected to said first and second connections and a circuit responsive to a reference pulse so that subsequent pulses following the reference pulse in one of the signal time positions can be detected as a function of the time after the reference pulse.
14. A powerline pulse position modulated communication receiver comprising:
- first and second connections for connecting to an AC powerline;
- a digital control integrated circuit;
- a filter circuit coupled to said first and second connections for filtering out power voltages and passing signal pulses, said digital control integrated circuit being connected to said filter circuit to receive signal a message composed of at least one synchronization/reference pulse followed by one or more data pulses passed by said filter circuit; and
- a zero voltage crossing detector circuit coupled to said first and second connections and to said digital control integrated circuit, said digital control integrated circuit being programmed to compare the timing of the data pulses to the timing of said synchronization/reference pulse to determine at which one of a plurality of signal timing positions the data pulse is in relative to said synchronization/reference pulse position, said digital control integrated circuit deriving an encoded digital data number from the position of said data pulse being located in said one of said plurality of possible said timing positions relative to said synchronization/reference pulse position.
15. The powerline pulse position modulated communication receiver of claim 14 wherein said digital control integrated circuit senses signal pulses only at predetermined liming positions within a predetermined time range close to the zero crossing time.
16. The powerline pulse position modulated communication receiver of claim 15 wherein there are at least four signal timing positions before but not at zero crossing.
17. The powerline pulse position modulated communication receiver of claim 14 wherein said apparatus is one of two parts of a system, both being connectable to the same powerline for communication therebetween on the powerline, said system comprising two of said apparatus, one acting as a transmitting controller and the other acting as a receiving controller, each said transmitting controller and each said receiving controller respectively containing a digital control integrated circuit which can be programmed to act as a transmitting digital control integrated circuit or a receiving digital control integrated circuit, each said apparatus having a zero voltage crossing detector circuit connected thereto, and each said apparatus having both a transmitting circuit and a receiving circuit so that either said apparatus can act as a transmitting controller or as a receiving controller, utilizing the same digital control integrated circuit.
18. The powerline pulse position modulated communication receiver of claim 14 wherein said received signal pulses are received by a circuit incorporating a means for automatically adjusting the receive detection voltage level to provide automatic gain control.
19. A powerline pulse communication apparatus comprising:
- a transmitting controller and a receiving controller, said transmitting controller and said receiving controller each having connections for connecting to an alternating current powerline;
- said transmitting controller having a zero voltage crossing detector circuit with connections for connecting to the alternating current powerline, said transmitting controller having a digital control integrated circuit therein, said zero voltage crossing detector circuit having an output connected to said digital control integrated circuit;
- a command input connected to said digital control integrated circuit so that when said command input is actuated said digital control integrated circuit emits a trigger signal;
- a serially connected switch and capacitor having connections for coupling to the alternating current power supply so that, when said switch is actuated, said capacitor is charged by the alternating current power supply, said switch being connected to receive at least one trigger signal from said digital control integrated circuit, said digital control integrated circuit being programmed so that the synchronization/reference pulse trigger signal is within a predetermined time period referenced to a prior zero crossing so that said capacitor is discharged and the synchronization/reference pulse is added to the powerline within said predetermined time period near to but spaced from a zero crossing time;
- said digital control integrated circuit being programmed so that the one or more data pulse trigger signals are produced within a predetermined time period so that said capacitor is discharged and at least one data pulse is added to the powerline within one of a plurality of time positions within said predetermined time period referenced to said prior synchronization/reference time position.
20. The powerline pulse communication apparatus of claim 19 wherein said digital control integrated circuit is programmed to rum on said switch at a time to produce a powerline synchronization/reference pulse at one of a plurality of predetermined temporal positions referenced to the zero voltage crossing point.
21. The powerline pulse communication apparatus of claim 19 wherein said digital control integrated circuit is programmed to turn on said switch at a time to produce the powerline data pulse at one of a plurality of predetermined temporal positions referenced to the synchronization/reference pulse position.
22. The powerline pulse communication apparatus of claim 20 wherein there are at least four temporal positions separately defined by said digital control integrated circuit within the quiet zone within about 1,000 to 500 microseconds of zero voltage crossing.
23. The powerline pulse communication apparatus of claim 22 wherein each of said temporal positions is approximately 32 microseconds apart.
24. The powerline pulse communication apparatus of claim 16 wherein said receiving controller also has a zero voltage crossing detector circuit and a receiving digital control integrated circuit, said zero voltage crossing detector circuit being connected to said receiving digital control integrated circuit;
- a filter circuit having connections for connection to the household powerlines to receive power signals and communication pulses superimposed therein by a transmitting controller, said filter circuit substantially filtering out all signals except any command pulse in the powerline, said filter circuit being connected to said receiving digital control integrated circuit, said receiving digital control integrated circuit being programmed to be sensitive only to signal pulses within a predetermined time period near to but spaced from zero crossing.
25. The powerline pulse communication apparatus of claim 24 wherein said receiving digital control integrated circuit is programmed to distinguish between different temporal positions within said predetermined time period near to but spaced from zero crossing.
26. The powerline pulse communication apparatus of claim 24 wherein said receiving digital control integrated circuit is programmed to distinguish between different temporal positions within said predetermined time period relative to the position of reference pulses.
27. The powerline pulse communication apparatus of claim 24 wherein there is an output controller connected to said receiving digital control integrated circuit and said output controller is for connection to the alternating current powerline and to an electrical load, said output controller turning on said load when said receiving digital control integrated circuit detects pulses in said powerline corresponding to a command to energize the load.
28. The powerline pulse communication apparatus of claim 21 wherein said transmitting digital control integrated circuit is programmed to turn on said switch at a time to produce the powerline pulse within one of several temporal positions near to zero voltage crossing.
29. The powerline pulse communication apparatus of claim 21 wherein there are at least four possible temporal positions separately defined by said processor within said predetermined time period near to zero crossing.
30. The powerline pulse communication apparatus of claim 25 wherein each of said temporal positions is approximately 32 microseconds apart.
31. A powerline pulse position modulated communication system comprising:
- a transmitter, first and second connections on said transmitter for connecting to an AC powerline, a zero voltage crossing detector connected to said connection, a circuit in said transmitter for producing a pulse to said connections for producing a pulse in the powerline, said circuit receiving zero voltage crossing information from said zero voltage crossing detector and creating at least one synchronization/reference pulse in the powerline in a quiet zone window which is positioned in a predetermined quiet time period near to zero voltage crossing but not at the zero crossing time, followed by at least one data pulse time referenced to said synchronization/reference pulse; and
- a receiver having first and second connections for connecting to the same AC powerline, a zero voltage crossing detector in said receiver and a circuit in said receiver connected to said first and second connections and to said zero voltage crossing detector, said circuit being conditioned by the zero voltage crossing detector to receive at least one synchronization/reference pulse from said transmitter through the powerline said synchronization/reference being positioned in a predetermined quiet time period near to zero voltage crossing but not at the zero crossing time;
- said circuit being conditioned to receive subsequent data pulses from the powerline within the quiet zone which is positioned in a predetermined quiet time period near to zero voltage crossing but not at the zero crossing time; said subsequent data pulses being located at positions which are referenced to said synchronization/reference pulse position and not to the subsequent zero crossing times.
32. The powerline pulse position modulated communication system of claim 31 wherein said predetermined quiet time period is between about 500 microseconds and 1000 microseconds away from zero voltage crossing.
33. A powerline pulse position modulated communication method for remotely controlling a load, comprising the steps of:
- providing a transmitting controller for connection to the powerline;
- sensing zero voltage crossing in the powerline;
- sensing a load control command and causing the discharging of a capacitor across the powerline and causing the transmission of a reference pulse related to the zero crossing sensing and the load control command;
- causing the discharging of a capacitor across the powerline for causing transmission of a series of actuating data pulses related to the position of the reference pulse and the load control command;
- sensing at a receiving controller the zero voltage crossing, sensing the reference pulse, sensing the data pulses and determining in which signal timing positions the data pulses are located as compared to position that the reference pulse occurred; and
- actuating the load depending upon in which signal timing positions the data pulses occurred.
34. The method of claim 33 wherein the discharging of the capacitor to place a pulse in the powerline is caused by actuating a triac to become conductive with the triac-actuating signal being produced by a transmitting controller digital control integrated circuit.
35. The method of claim 34 wherein the timing of the trigger pulses to the triac are related to the zero crossing times by discharging the capacitor at a series of signal positions adjacent zero crossing times which correspond to a command for load control.
36. The method of claim 34 wherein the timing of the trigger pulses to the triac are related to the reference pulse times by discharging the capacitor at a series of signal positions adjacent zero crossing times which correspond to a command for load control.
37. The method of claim 33 wherein the signal timing positions are between about 500 and 1000 microseconds away from the zero crossings of the powerline voltage.
38. The method of claim 36 wherein the signal timing positions are approximately 100 microseconds apart.
39. The method of claim 33 wherein the receiving controller filters the signal out of the powerline voltage adjacent the zero crossing where the powerline is substantially quiet and delivers a series of sensed signal pulses to the digital control integrated circuit which determines at which signal timing positions said series of pulses occurred.
40. The method of claim 39 wherein the sensing at which signal timing positions the series of pulses occurred is correlated with a load command to appropriately actuate a load.
41. A method of transmitting data through a powerline comprising:
- providing a powerline having a wave form of a plain sine wave with repeating, alternating positive and negative half-cycle waves;
- transmitting through the powerline one or more electrical reference pulses used as references pulses, each of said electrical reference pulses positioned in one of a plurality of specified time windows located on at least one of the alternating positive and negative half-cycle waves;
- transmitting through the powerline a plurality of electrical data pulses representative of said data, each of said electrical data pulses positioned in one of a plurality of specified time windows located on at least one of the alternating positive and negative half-cycle waves and referenced to said reference pulses; and,
- said data having values determined by the location of which of said specified time windows said electrical data pulses fall within.
42. A method of controlling an electrical device connected to a powerline having a conventional AC sine wave form comprising:
- connecting the electrical device to the powerline, said electrical device adapted to be controlled by two or more control signals;
- generating two or more control signals;
- said control signals comprising at least one reference control signal and at least one data control signal following and referenced to said reference control signal;
- transmitting said control signals through the powerline, each of said control signals transmitted in one of a plurality of specified time windows located at predefined positions on the AC sine wave;
- receiving said control signals; and,
- controlling the device in response to receiving said control signals.
43. An electrical control system comprising:
- an alternating current powerline having a conventional AC sine wave form;
- an electrical system supplied with electrical power from the powerline;
- one or more electrical loads positioned in the electrical system and electrically connected to the powerline;
- the electrical loads adapted to be controlled by electrical pulses transmitted through the powerline, each of said electrical pulses located in one of a plurality of specified time windows;
- said electrical pulses comprising one or more reference pulses and one or more data pulses;
- said data pulses representing numeric data, following and referenced to said reference pulses; and,
- said numeric data determined by in which of said plurality of specified time windows said data pulses occur.
44. A control system comprising: an electrical load connected to an energized, alternating current powerline having a conventional plain sine wave form with repeating, alternating positive and negative half-cycle waves further comprising,
- a control code having at least two predetermined electrical pulse positions on at least one of the alternating positive and negative half-cycle waves;
- a numeric value assigned to each of the pulse positions;
- an electrical pulse generator circuit adapted to generate reference electrical pulses and data electrical pulses and to transmit said reference electrical pulses through said powerline and to transmit said data electrical pulses through said powerline in one or more of said signal pulse positions following and referenced to said reference pulses;
- said control code comprising a series of transmitted numeric values corresponding to said data electrical pulses.
45. The method of claim 41 further providing one or more triggering pulses prior to transmitting through the powerline said reference pulses.
46. The method of claim 42 further providing one or more triggering pulses prior to transmitting through the powerline said at least one reference control signal.
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Type: Grant
Filed: Aug 25, 2006
Date of Patent: Sep 21, 2010
Assignee: Powerline Control Systems, Inc. (Northridge, CA)
Inventor: Marshall E. Lester (Northridge, CA)
Primary Examiner: Daniel Wu
Assistant Examiner: Son M Tang
Attorney: Lewis Brisbois Bisgaard & Smith LLP
Application Number: 11/510,862
International Classification: H03K 7/04 (20060101); H03K 7/06 (20060101); H03K 9/04 (20060101); H03K 9/06 (20060101);