Abstract: An active filter suppresses harmonic current components flowing through a power supply, to which a compensation object load including a harmonic component source and a capacitive load is coupled. The active filter supplies a compensation current Ic in accordance with an output of a subtracter coupled to current transformers for detecting the load current I1 and the capacitive load current If, respectively. Thus, the compensation current Ic supplied from the active filter corresponds to and compensates only for the harmonic current components generated by the harmonic component source. The capacitive load current If is excluded from control operation. Thus, the positive feedback of the system is avoided, and stable control operation can be obtained.

Abstract: A subharmonic noise reduction circuit having an input terminal and an output terminal. The circuit has a first differential amplifier with a first non-inverting input, a first inverting input and a first output. The overall circuit input terminal is connected to the first non-inverting input. A low-pass filter is connected between the first output and the first inverting input. A second differential amplifier has a second non-inverting input, a second inverting input and a second output. The second output is connected to the overall circuit output terminal. A first resistor is connected between the second output and the second inverting input. A second resistor is connected between the first non-inverting input and the second non-inverting input. The circuit operates at unity gain of the DC voltage component and thus the DC output voltage follows the DC input voltage.

Abstract: A security system for controlling the operation of releasing a lock mechanism for locking a steering mechanism of a mobile medium such as a vehicle. This system is provided with at least one information medium such as a license card on which information which identifies the operator of the mobile medium stored, a reading device for reading out the information stored in the information medium, a memory device in which information which is the same as the information stored on the information medium is stored previously and a comparing device which compares an output from the reading device with the contents of the memory device and which outputs a lock-release signal for releasing the lock mechanism when a match occurs in this comparison. The security system further may include writing means by which the contents of the memory device may be rewritten if the output of the reading device coincides with the contents of the memory device.

Abstract: A vehicle anti-theft device includes a lock body carried on the vehicle and having a key receiving a slot. A pair of bore holes are spaced apart from each other in a predetermined pattern and extend through the lock body, which is transparent to a particular frequency of electromagnetic radiation. The key includes a first radiation reflective area aligned with one of the bore holes and a second non-reflective area aligned with the other bore hole. A systems controller includes a pair of radiation emitters and associated radiation detectors. A pair of fiber optic cables connect the radiation emitters and the radiation detectors to the bore holes. The systems controller generates control signals in response to radiation reflected from the key through the optic cables. If a proper pattern of radiation is reflected through the optic cables, the vehicle will be operated in a normal manner.

Abstract: An improved interior lighting system for use in an automobile incorporates a traditional manual switch and door switch for turning the interior light of the automobile on and off, and provides circuitry for causing the interior light to rise transiently to a maximum level when activated to turn on and for causing the interior light to decay transiently to a minimum level when activated to turn off. Circuitry is also provided to automatically turn off the interior light after a predetermined time lapses from the interior light being manually activated by the manual switch, when the ignition to the automobile is turned off. The lighting system also includes circuitry to cause the interior light to remain on for a predetermined time after the door of the automobile is opened, and circuitry to override the predetermined time delay when the ignition of the automobile is turned on.

Abstract: Automobiles such as a cash carrying car, truck, police car and so on, are prevented from being ridden away during loading or unloading cash or goods or being robbed by robbers after having been forcibly stopped on road. When a door of the automobile is opened, a opened-door detection switch operates and a first-control means stores in its memory the switch's action and cuts off an engine start-up circuit. The engine can be restarted when a registered password is entered into the device through a password inputting means, whereby a second-control means stores the signal and enters a resetting signal into the first control means to restore the engine start-up circuit. At the same time, a resetting signal produced by a reset signal generating means is inputted into the second control means which is thereby restored to the initial state.

Abstract: The invention features a theft resistant security system for motor vehicles. The system has receptacle with a coupling coil. A SAW (surface acoustical wave) device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction with the receptacle coupling coil. A testing mechanism is connected to the receptacle for determining whether the code of the SAW device is valid for operation of the motor vehicle. Problems of crosstalk and wave reflection may produce spurious code pulses in systems of this type. The invention provides techniques for eliminating or reducing these unwanted pulses.

Abstract: The problem of reducing harmonic content of AC bus voltage in a power system (10) is minimized using a controller (30) for a PWM inverter (38). The controller (30) develops a duty cycle command on a line (40) for controlling operation of the PWM inverter (38). The controller (30) develops the duty cycle command to maintain the PWM inverter output voltage at a desired level. This duty cycle command is modulated in accordance with the harmonic content evident on a DC bus (34) which supplies power to the PWM inverter (38).

Abstract: An electronic lock security system includes a coded key and a multiple position key receiver switch having a code sensing circuit for generating signals indicative of the key's code. A decoder compares the key's code to a preset code and when a match is determined outputs a control code to a switch control circuit. A switch control circuit includes flip-flops for remembering when switch positions intermediate the off and last positions have been accessed and output control signals upon receipt of the decoder's control signal. The flip-flop outputs are consecutively ANDed together down to the last position to permit operation of a power switch to provide working power to a solenoid operated device only when all positions of the multiple key receiver have been accessed during operation.

Abstract: A theft resistant security system for motor vehicles. The system has a receptacle with a coupling coil. A surface acoustical wave device associated with the receptacle for relative movement thereto is also provided. The SAW device has a code and its own coupling coil for interaction with the receptacle coupling coil. A testing mechanism is connected to the receptacle for determining whether the code of the SAW device is valid for operation of the motor vehicle.

Abstract: A filter system for removing selected frequencies from AC power provided on at least two phase lines and a neutral line includes a phase-to-phase filter for removing a first selected AC component at a first frequency from the AC power wherein the frequency component has a line-to-phase displacement within first or second ranges. A phase-to-neutral filter is also provided for removing a second selected AC component at a second frequency different from the first frequency from the AC power wherein the second frequency component has a line-to-line phase displacement outside of the first and second ranges.

Abstract: An electric noise absorber, comprising divided magnetic substances made of ferrite, a holding member for holding the magnetic substances at its holding projections, and engaging members formed in the magnetic substances which engage with the holding projections. The electric noise absorber is attached to and detached from an electric cable easily without removing the electric cable and is composed of a minimum number of units.

Abstract: A disabling device for electronic circuits includes a female connector with an easily accessible front surface and an inaccessible rear surface. A large array of contact pairs are found in the female connector. A predetermined number of input/output wires join the female connector in series with the circuit across randomly selected contact pairs in the array. A number of non-functional dummy wires also connect in the array to further complicate the non-uniform connection pattern. When a male connector containing an internal arrangement of jumper wires is inserted into the female connector, the jumper wires short across the proper contact pairs and close the circuit. Subsequent removal of the male element again opens and disables the circuit.

Abstract: Filter equipment for power lines has a double-tuned shunt filter (F1) which has a series resonance circuit (C1, L1) connected in series with a parallel resonance circuit (C2, L2). The capacitor banks of the two resonance circuits are formed so as to have opposite signs on the temperature coefficent of the capacitor capacitance.

Abstract: A locking device for vehicles includes a card including a microprocessor and a transmitter for generating and transmitting commands for locking and unlocking the doors of a motor vehicle. A lock control device includes a microprocessor and a receiver for receiving the commands transmitted by the lock command device. The lock control device will only carry out a receive command if the command is applied to a specific motor vehicle and the motor vehicle is in the proper state to implement the command. Change data is generated by the lock control device and transmitted to the lock command device to change the value of the next subsequent lock command so that the lock command can be uniquely identified with the motor vehicle.

Abstract: A control device for an active filter according to the present invention comprises a ROM circuit for producing output signals sin .theta. and cos .theta. from a phase signal generated from a PLL circuit, a first multiplier for multiplying a load current detection signal by the output signals sin .theta. and cos .theta., a sample-holding circuit for integrating the output signal of the first multiplier and holding the integrated value to produce peak values of valid current component and invalid current component for constituting the basic wave component of the load current, a second multiplier for multiplying the peak values by the output signals sin .theta. and cos .theta., and a PWM control circuit for PWM-controlling the input current of the active filter with a harmonic current signal obtained as the difference between a basic wave current signal of the load current during a period of next one period of the single-phase a.c.

Abstract: The device can be applied to vehicles provided with an electronic control device for the vehicle engine. The protecting device for includes a keyboard for entering a user's code, a microprocessor for converting entered data coming from the keyboard into an output message containing the user's code, programmable and non-volatile memory for storing the code for unlocking the engine electronic control device, a microprocessor for comparing the unlocking code stored in the memory with the user's code contained in said message coming from the keyboard and unlocking the engine electronic control device when there is coincidence of the code contained in the memory with that contained in said output message, and the microprocessor and the memory being capable of effecting replacement of the unlocking code of the engine control device with a new unlocking code through action on the keyboard.

Abstract: A vehicular anti-theft system which combines a mechanical key and an electronic key involving a code light signal. A light emitting element is provided in a casing attached to a base end of the shank of the mechanical key while a light receiving element is provided adjacent to an open end of the key hole so that the conventional action of fitting the key shank into the key hole causes the transmission of a code light signal between these elements. Advantageously, the light emitting element can be additionally equipped with the function of locking and unlocking a vehicle door so that the user can obtain the benefits of both a remote control entry system and a highly effective anti-theft engine start system.

Abstract: A high-pass element of a filter assembly for a line connected to static converters having a high voltage level for filtering harmonics and damping resonance sites includes a first series circuit including a first capacitor, a first choke coil, and a second choke coil. A resistor is connected in parallel with the choke coils. A second series circuit is connected directly in parallel with the second choke coil. The second series circuit includes a second capacitor and a damping resistor. On the other hand, the second capacitor and the damping resistor may be in parallel with the second choke coil and at least one other series circuit may be connected in parallel with the second choke coil. The at least one other series circuit includes a series capacitor and a series resistor.

Abstract: A method by which a turbine generator (1, 2, 3) can be protected against sub-synchronous frequencies occurring in an electric network which is connected to the turbine generator and which incorporates capacitors. The method is based on de-equalizing the subsynchronous natural frequencies of the three phases, so as to weaken the coherence of the frequencies. This is achieved by incorporating in each of two of the phases a respective inductance L of mutually different size and by changing the capacitance equivalently with a series capacitance C such as to fulfill the condition 1/LC=.omega..sub.o.sup.2, where .omega..sub.o is the network frequency.

Abstract: A security system has a key including a transmitter for emitting a coded signal and a receiver for the signal and connected to a latch of the vehicle for unlocking a door secured by the latch only when the coded signal is received. A column bolt is displaceable in a housing fixed around the steering column between a locking position preventing the column from rotating and a freeing position. A barrel rotatable in the housing is formed with an axially open pocket generally complementary to the key. A switch is actuatable in one end position of the barrel for starting the vehicle and a locking pin is displaceable in the barrel and engageable into the pocket and into a lateral recess of the key when same is fitted in the pocket. A lever can engage in the recess of the barrel in the other of the end positions and can also engage in this other end position with the pin to push same into the pocket and into the recess of the key therein.

Abstract: An active filter unit comprising a first active filter which operates under low-frequency PWM control for controlling the fundamental and low-order harmonic capacity and a second active filter which operates under high-frequency PWM control for controlling the high-order harmonic capacity. The first and second active filters are connected in series through associated transformers that are in serial connection across the power lines. The divided filter arrangement reduces the required power rating of high-frequency switching devices.

Abstract: An automotive antitheft key arrangement for locking and unlocking an automotive vehicular door and for operating an ignition system includes a transmitter, first and second receiving means for receiving an input code signal sent from the transmitter unit, and a discriminator including a comparator which compares the input code signal received by the first or second receiving means with a present code signal. The discriminator produces a first or second comparator output when these signals match each other. In response to the first or second comparator output, electrical power is applied to a door lock mechanism for locking and unlocking the door or a starter motor for causing the engine starting operation. The door lock system further includes means for preventing either the first or second comparator output from being produced in response to turn ON or OFF of a starting switch so that the first comparator output is not produced when the second comparator output is produced, and vice versa.

Abstract: The invention relates to a vehicle use, wireless signal controlled locking and unlocking system. This system includes a user-carriable, userside controller and a vehicle side controller. The former controller takes the form of a card. Both these controllers are mutually communicatable by way of wireless communication and adapted for control of door-locking and unlocking operations. Switches are provided at the vehicle outside door handle and trunk, while a buzzer and a timer are provided within the vehicle interior. The buzzer is operated for a predetermined short time period, for instance 5 seconds, when the door has been brought to its locked position under such a condition that when the userside controller had been left in the vehicle with carelessness. In this case, however, the door can be opened by simple manipulation of the handle switch so far as the buzzer is kept in operation.

Abstract: The present invention pertains to an AC electrical distribution system. The AC distribution system includes at least one nonlinear load. The nonlinear load causes distortion voltage in the AC distribution system. The AC distribution system also includes a zone filter which provides voltage to the AC distribution system. The AC distribution system can have a first zone which includes a nonlinear load and can have a second zone which includes at least one sensitive load. The zone filter regulates the voltage in the first zone as applied to the second zone and essentially eliminates the distortion voltage in the first zone as applied to the second zone. The zone filter can include a transformer device which provides a voltage to the AC distribution system. There is also a device for supplying power to the transformer device.

Abstract: A harmonic suppressing device provided in a power system such as, for example, a transmission and distribution system or a power generating system, to filter higher harmonic currents generated by a higher harmonic current source of the power system such as, for example, a cycloconverter. The harmonic suppressing device comprises, as the principal components thereof, a passive filter serving as a high-order higher harmonic filtering unit for filtering higher harmonic currents of comparatively high order among those generated by the higher harmonic current source, and an active filter serving as low-order higher harmonic filtering unit for filtering higher harmonic currents of comparatively low orders among those generated by the higher harmonic current source.

Abstract: Damping of supersynchronous oscillations in an ac power system is accomplished by a damping circuit connected between a power line and a system neutral potential. The damping means includes a tuned circuit having a resonant frequency above the system operating frequency. Preferably, the tuned circuit further has an antiresonant frequency at the system frequency. The supersynchronous damping circuit in accordance with the invention can be used with subsynchronous damping circuits known in the prior art to enhance the damping of oscillations in the ac power system.

Abstract: Centralized control receiver for power distribution networks, includes an input section containing at least one digital filter, an evaluating device, and an output section, the digital filter having a frequency response effecting selective damping of harmonic frequencies of at least one of the frequency of a respective network and control frequencies of at least one of adjacent centralized control services and of network-specific interference frequency ranges.

Abstract: Damping of supersynchronous oscillations in an ac power system is accomplished by a damping circuit connected between a power line and a system neutral potential. The damping means includes a tuned circuit having a resonant frequency above the system operating frequency. Preferably, the tuned circuit further has an antiresonant frequency at the system frequency. The supersynchronous damping circuit in accordance with the invention can be used with subsynchronous damping circuits known in the prior art to enhance the damping of oscillations in the ac power system.

Abstract: An inductive pulse generator for converting a rotary movement into a frequency proportional therewith. The pulse generator includes a measuring wheel (1) provided with poles (3) of magnetic material evenly distributed over the circumference of the measuring wheel. The pulse generator further includes a stator (4) provided with a magnetic core (6) with plate-shaped pole shoes (10) in a coil carrier (8) out of which end portions (12) of the pole shoes (10) project. The end portions (12) face the measuring wheel (1). A coil (7) surrounds the magnet core (6), at which coil (7) a pulsating voltage can be picked off with a frequency proportional to the number of revolutions of the measuring wheel (1), outside the area of the pole shoe (10) end portions (12) facing the measuring wheel (1). The thickness of the pole shoes (10) is increased by additional magnetic material (11) so as to increase the pulsating voltage which can be picked off at the coil (7).

Abstract: A circuit arrangement for large power transformers with a low-voltage winding, a main high-voltage winding and a step winding as well as a step switching device at a Y-point side thereof, includes, at a location between a point connecting the step winding to the high-voltage main winding and the Y-point of the transformer, a capacitor in series with a resistor is connected electrically parallel to respectively current-carrying steps of the step winding, the capacitor and the resistor being of such dimensions as to decrease resonance amplitudes of the connecting point to ground, the capacitor being constructed of spirally wound strip lines formed of a resistance alloy, the strip lines being also of such dimensions as to reduce resonance amplitudes of the connecting points.

Abstract: At least two active conditioners are connected in series with a common DC source, and are mounted as a unit between two pairs of AC terminals to act either as a tie-in link between two AC power sources, as a buck/boost regulator between one AC power source and its load, or as VAR compensator as well as active power conditioner between phases of a multiphase AC option.

Abstract: In this context, a frequency converter generates a multiphase alternating current of variable frequency which current feeds an alternating-current machine via alternating-current lines into which for each alternating current phase line one commutating choke is integrated for limiting the change of current with respect to time di/dt. Since the efficiency of a synchronous motor is best when fed with a sinusoidal alternating current, a frequency-variable filter is provided as a bypass circuit to the synchronous motor which makes the alternating current sinusoidal within a predeterminable frequency range. The frequency of the alternating current is measured with a frequency meter and monitored for exceeding a limit in a frequency limit detector. The filter can be tuned step-by-step by means of switching signals to different frequencies by changing the inductance or capacitance of series-tuned circuits step-by-step. Undesirable harmonic frequencies can thus be attenuated with-in a relatively large frequency range.

Abstract: In this three-phase filter circuit system for static converter systems and particularly high-voltage direct-current short ties, at least two high-pass filters are provided which are connected in parallel. Each high-pass filter consists of a choke connected in parallel with a resistance and, in series with both, a capacitor and can be individually connected to the three-phase busbar via a switch. The filter circuits are used not only for reducing harmonics but also as compensating devices, which can be switched in steps, for the reactive power requirement of the static converters so that in the lower partial load range of the system one of the filter circuits is disconnected for reasons of reactive power balance. In order to improve the filtering effect in this lower partial load range, a bus-coupler switch connecting in each case the common junctions of capacitor, resistance and choke of the high-pass filters is closed.

Abstract: A driver circuit for applying a first signal having a desired wave form, frequency and peak to peak voltage to a coaxial transmission line which also has applied to it a second signal having a substantially higher frequency. An operational amplifier has the first signal applied to its noninverting input terminal. The output of the operational amplifier is applied across the primary winding of a driver coupling transformer through an inductor which provides high impedance to the second signal. The voltages induced in the secondary winding of the driver transformer are applied to the transmission line. The primary winding of a feedback transformer is connected in parallel with the secondary winding of the driver transformer. The voltage induced in the secondary winding in the feedback transformer are applied by a feedback circuit including an R.C. filter to the inverting input terminal of the operational amplifier. The signal applied to the inverting input terminal includes both an A.C. component and a D.C.

Abstract: A DC power supply circuitry comprises an AC power source transformer with its secondary winding having a center tap; a rectifier circuit; a smoothing circuit; and a bidirectional switching circuit having predetermined threshold values, interposed in between the center tap and the smoothing circuit.

Abstract: A commutator motor having a radio noise preventing device, where a common ground terminal of radio noise preventing capacitors is connected to a stator core. The stator core has two opposed arcuately faced poles around which field windings are respectively wound. A pair of non-magnetic metal pieces are provided between the poles in opposing relation, so that they surround an armature with the poles.

Abstract: Reactance means serially connected in a power line is shunted by selectively bidirectional conduction means which is triggered in response to half-cycle time periods of current waves exceeding a desired half-cycle time period and also in response to an over voltage across the reactance means.

Abstract: A d.c. power transmission line comprises two wire-type systems providing for lightning protection of line conductors (2,3). One of the wire-type systems comprises at least two wires (9) in a spaced relation to each other and is located above a line conductor (2) connected to a negative pole (6) of a d.c. power supply (7). A second wire-type system comprises a single wire (11) and is located above a line conductor (3) connected to a positive pole (8) of the d.c. power supply (7).

Abstract: A brush holder assembly is designed so as to be prefabricated in automatic assembly machines. All the components of the assembly are located on a single side of an insulated carrier plate. The components are connected together by means of electrically conductive grommets which are fixed in the carrier plate. A vibration-resistant holder assembly is thus formed which can be assembled with less cost than other such assemblies which require hand labor.

Abstract: Two spaced capacitors are connected in parallel across each supply lead of a brush-commutator type electric motor and the motor frame to provide a PI filter for each brush in which the length of brush lead between the capacitors comprises the inductor element of the filter. To facilitate this arrangement, one of the capacitors for each brush is mounted upon one side of an annular support member of an insulating material and an electrically conductive plate arranged to electrically engage the motor frame upon assembly is mounted upon the other side with electrical connections extending through the support member to interconnect one terminal end of each of the capacitors to the conductive plate and to secure the conductive plate to the support member.

Abstract: A power source system, which comprises a converter for converting AC power on an AC bus into DC power, a damped filter connected between the AC bus and ground and including a capacitor and an inductor, a diode-rectifying circuit for taking out and rectifying fundamental and harmonic waves produced across the inductor in the damped filter and a circuit for connecting a DC output circuit in the diode-rectifying circuit in series with a DC output circuit in said converter, and in which the rectified output is regeneratively added to the output of the converter.

Abstract: In order to suppress the high-frequency currents in bearings of shafts, the bearing capacity is arranged in the configuration of an electric quadrupole in such a manner that the high frequency voltage becomes a minimum. In the case of ungrounded shafts, a further impedance is provided between the bearing housing and the housing of the treatment chamber such that the sum of this further impedance and the impedance of the shaft are great compared to the bearing impedance. Additionally, a low resistance in the form of a sliding contact is shunted across the bearing impedance. The further impedance according to one embodiment is a capacitance and in another embodiment is a parallel L-C resonant circuit which is connected in series with the bearing. The capacitance of the L-C circuit is formed by an insulating plate and the inductance by a winding.

Abstract: In order to suppress the high-frequency currents in bearings of shafts, the bearing capacity is arranged in the configuration of an electric quadrupole in such a manner that the high frequency voltage becomes a minimum.

Abstract: A DC-to-DC Converter using four tightly coupled transformer windings, two energy transfer capacitors, and a pair of switching devices connected to remove the ripple from both the input and output current circuits. The switching devices are driven in response to a switching signal.

Abstract: A shoulder strap for the driver of an automotive vehicle is used as a safety device for automatically braking the vehicle, de-energizing the ignition circuit and energizing a warning signal in the event the driver slumps in his seat because of sickness, injury, sleepiness, unconsciousness, or other incapacitating conditions rendering him incapable of properly operating the vehicle. Certain components of the vehicle are controlled whenever the slumping is sufficient to apply tension to the strap against the action of a spring connected with the strap. An extension of the strap beyond the operator's shoulder is readily accessible to passengers for actuation in the event they notice any tendency by the operator to become incapacitated, thereby preventing accidents and consequent injury or death to the occupants and others outside the vehicle.

Abstract: To improve the effect of a filter circuit for the harmonics, which contains an L-C-R series resonant circuit in at least one loop, a variable supplementary current excitation which compensates the residual harmonic current in the consumer arrangement at least approximately, is coupled into the series resonant circuit, the supplementary current excitation preferably being supplied by a compensation transformer which is controlled by the current in the loop, the compensation transformer being excited by a source and controlled by an auxiliary transformer arranged in the loop.

Abstract: The invention is directed to a circuit arrangement and a suppressor-insulator member for suppressing noise in a portable hand-held electric-powered tool such as a double-insulated tool or the like while at the same time providing electrical insulation between voltage-carrying portion within the tool and an exposed part of the tool accessible to the operator of the tool. The suppressor-insulator member for conducting high-frequency noise from the voltage-carrying portion within the tool to the exposed metal part includes two connecting plates connectable to the voltage-carrying portion and the exposed-metal part respectively; and, a plate-like element of insulating material sandwiched between the connecting plates.

Abstract: Method and apparatus for suppressing differential and common mode conducted electromagnetic interference emission in electrical equipment powered from a grounded A.C. line source without creation of a shock hazard. Differential mode interference is suppressed by connecting a capacitor across the power lines and common mode interference is suppressed by an inductor inserted in the ground lead, both positioned within the equipment case or housing. The capacitor and inductor can have substantially fixed values for a wide range of equipment. In the preferred embodiment, the inductor is constructed by winding a few turns of the ground lead itself through a high permeability, ferrite toroid positioned within the case or housing.

Abstract: A static converter equipment comprising at least two converters, each with a DC terminal; each converter having a load with a feeding point connected to the DC terminal of the converter, the converters being arranged to work in offset phase relation to each other. The feeding points are interconnected with impedance means with resistance of at least the same order of magnitude as the load resistance and an impedance at the most of the same order of magnitude as the load impedance.