Abstract: A load control system for controlling the amount of power delivered from an AC power source to a plurality of electrical load includes a plurality of independent units responsive to a broadcast controller. Each independent unit includes at least one commander and at least one energy controller for controlling at least one of the electrical loads in response to a control signal received from the commander. The independent units are configured and operate independent of each other. The broadcast controller transmits wireless signals to the energy controllers of the independent units. The energy controllers do not respond to control signals received from the commanders of other independent units, but the energy controllers of both independent units respond to the wireless signals transmitted by broadcast controller. The energy controller may operate in different operating modes in response to the wireless signals transmitted by the broadcast controller.

Abstract: A system includes a voltage regulator connected to a voltage source for providing a regulated voltage at a first level in a first mode of operation and at least one second level in a second mode of operation. The second voltage level is higher than the first voltage level. A control processor provides control signals to select between the first and the second modes of operation. A component associated with the voltage regulator. The component is disabled in the first mode of operation and enabled in the second mode of operation. The control processor generates control signals to configure the voltage regulator to generate the voltage at the first level in the first mode of operation when the component is disabled and to configure the voltage regulator to generate the voltage at the at least one second level in the second mode of operation when the component is enabled.

Abstract: Within an electronic device, a voltage regulator powers a load. The voltage regulator has adjustable operating parameters that can be set during operation of the electronic device. The adjustable operating parameters are set or reset in accordance with a state of the electronic device, or a portion thereof having the load, in order to optimize power usage. The state is selectable from at least three predetermined states. Values for the operating parameters are selectable from a plurality of sets of values. Each set of values corresponds to at least one of the predetermined states.

Abstract: A supply arrangement, a supply unit and a method in which a switching element is connected in series to an operating voltage and an electrical load, wherein a supply unit supplies an electronic unit with power independently of the switching state of the switching element.

Abstract: A DC-DC converter includes an interface to receive data having voltage values. A first circuit carries out a voltage transition from a previously received voltage value to a received voltage value (VSEL). A second circuit activates or inactivates the first circuit in response to an activation signal or a stop signal provided by the interface. A third circuit configures the second circuit so that, when new data including a new voltage value is received during a voltage transition, the second circuit interprets the stop signal as an activation signal for the first circuit to carry out a new voltage transition. The setting circuit sets at least one parameter needed by the first circuit to carry out the new voltage transition in response to the new data and before the end of the new voltage transition.

Abstract: There is provided a power supply device, including a connection state determiner that determines a connection state between an external power recipient device and a power line on which electric power is transmitted, a communication control unit that, in a case where the connection state determiner determines that the external power recipient device is connected to the power line, causes information related to power receiving capability corresponding to the external power recipient device to be acquired by wireless communication, a power receiving capability specifier that specifies the power receiving capability of the external power recipient device on the basis of the acquired information related to the power receiving capability, and a power control unit that causes electric power compatible with the external power recipient device to be transmitted on the basis of the specified power receiving capability.

Abstract: Circuitry, which includes a direct current (DC)-DC converter having a first switching power supply is disclosed. The first switching power supply includes a first switching converter, an energy storage element, a first inductive element, which is coupled between the first switching converter and the energy storage element, and a first snubber circuit, which is coupled across the first inductive element. The first switching power supply receives and converts a DC power supply signal to provide a first switching power supply output signal based on a setpoint.

Abstract: A household appliance (1) includes an electronic command device (3) configured to reduce standby-state energy consumption of the electric household appliance (1). The electronic command device (3) includes an electronic control unit (20) and a switching mode low power supply unit (6) with a switching regulator unit (13) having a first control terminal (11) and at least an output terminal (9) which supplies a main prefixed supply voltage (VB) to the electronic control unit (20). The switching mode low power supply unit (6) is further configured to switch from a standby state to an operating state, when a prefixed voltage variation (?V) on the first control terminal (11) is detected. The switching mode low power supply unit (6) includes auxiliary supply means (14) which supply a low supply voltage (V1) different than zero to the first control terminal (11) during at least the standby state.

Abstract: A command system of a power conditioning system of the present invention receives return pattern information including a time instance and an upper output limit, and issues a command with respect to the upper output limit of the power conditioning system, the return pattern information being for preventing the frequency of an isolated power system, which is calculated by a planning server, from causing a sharp change.

Abstract: Methods, systems, and apparatus, for wirelessly controlling a power supply device that controls a load. A wireless adapter includes a wireless communication device that receives transmissions from a wireless controller, a serial interface for a serial data connection to a power supply processing device integrated in the power supply device, an adapter processing device that receives the control signals the wireless communication device outputs, generates the control commands from the control signals, and outputs the control commands to the serial interface to cause the power supply processing device to control power provided to the load in a manner specified by the control commands, and an adapter power circuit that receives regulated direct current (DC) power from the power supply device and is powered from the regulated DC power received, and provides power to the wireless communication device and the adapter processing device.

Abstract: An electronic device for inductive load switching is described. The electronic device includes a voltage sensor module that monitors a voltage waveform. The electronic device also includes a current sensor module that monitors a current waveform. The electronic device additionally includes a computing module coupled to the voltage sensor module and to the current sensor module that determines a power factor based on the voltage waveform and the current waveform. The electronic device further includes a controller module coupled to the computing module that switches off an inductive load based on the power factor. The electronic device has dimensions for fitting within a wall box.

Abstract: An apparatus and method is described herein for providing a dynamic pulse scheme for a voltage supply. A load (current) demand event of a processor is either predicted and/or detected. In response to the current demand event, such as a change in the current demand; a temporary, transient voltage pulse is generated by a voltage supply to compensate for the current transient demand. As result, dynamic voltage supply pulses generated based on the load current or the prediction of the load current demand increases performance, decreases power consumption, and saves expensive addition of compensation components, such as capacitors to a processor package.

Abstract: A power control method of servers is disclosed, where each of the servers includes a corresponding baseboard management controller. This method includes steps as follow. A rack management device is used for acquiring identification codes of the servers, wherein the identification codes of the servers are different from each other. Then, delay times based on the identification codes of the servers are generated by means of the rack management device, so that when each time passing through one of the delay times, the rack management device can send a power-on command to the corresponding server. The baseboard management controller can supply the power to the server according to the power-on command.

Abstract: An apparatus and a method for raising an output efficiency in a mobile communication terminal are provided. The apparatus includes a supply modulator and a power amplifier. The supply modulator includes a DC-DC converter, a voltage regulator, and a switching regulator. The supply modulator modulates an envelope component of an input signal to generate power. The power amplifier amplifies a phase component of the input signal using the power generated by the supply modulator as a power source of a collector/drain. The DC-DC converter raises battery power of the mobile communication terminal. The voltage regulator determines an output voltage of the supply modulator using the power raised by the DC-DC converter. The switching regulator determines an output current of the supply regulator using the battery power of the mobile communication terminal.

Abstract: An active load management system (ALMS) controllably restarts electrical service to service points in a utility service area after a power outage. The ALMS includes client devices installed at the service points and a central controller. In one embodiment, the controller associates numbers with the service points and stores the associations. Each service point may be associated with a unique number or a group of service points may share a number. After receiving notification that power is available, the controller determines a number and communicates the number to one or more of the client devices. Where the number was determined randomly, the client devices associated with the number may restart electrical service upon receipt of the number. Where the number was determined sequentially, a client device may determine its own random number and compare it to the received number. If a match occurs, electrical service can be restarted.

Abstract: An image processing apparatus that is capable of being instructed to power off, by a power switch or a command from an external apparatus, and is capable of executing the restart thereof under appropriate conditions. When power-off is instructed, shutdown is started. Upon completion of the shutdown, if the power switch is on, and at the same time the power-off has been instructed by the power switch of the apparatus, the restart of the apparatus is executed, whereas upon completion of the shutdown, if the power-off has been instructed by a command from the external apparatus, the restart of the apparatus is not executed.

Abstract: A power supply includes a power circuit for converting an input voltage or current to an output voltage or current, at least one interface port for receiving signals from one or more external devices, and a control circuit coupled to the power circuit and the at least one interface port. The control circuit is adapted to operate the power circuit in response to control signals having a plurality of different control signal formats that are received by the at least one interface port.

Abstract: Disclosed are a wired long-distance constant-voltage electricity-feeding method with a wake-up function and a system. A smart electricity supply module of a central electricity supply device generates a feed voltage from a central electricity source, and feeds the voltage to a terminal electricity source module through a feed line. Said smart electricity supply module can continuously provide electricity at a constant voltage to the terminal electricity source module and can change feed voltage polarity according to set rules when the terminal electricity module in sleep-mode must be remotely waken up. A voltage polarity monitoring module of said terminal electricity source module can determine, by monitoring the polarity of the voltage of the centrally fed electricity, whether to wake up the terminal electricity source module from sleep-mode to enter a normal electricity-supplying mode.

Abstract: The present subject matter relates to methods, systems, and networks for making available identified generator reserve capacity to provided compensation for lost generator capacity on a temporary basis. The present subject matter provides for increasing the power output of currently operating synchronous generators to provide substantially instantaneous supply of additional power upon loss of other generating capability. The system takes into consideration and makes available to system operators the general availability of additional real power output capability of operating generators even though such power generation may be provided at less than optimal operating characteristics of the individual generators providing the additional power.

Abstract: A system and method for charging a merchandise item is presented. A power supply system for charging the merchandise item includes: a power supply unit, a power cable with a cable control logic. The power supply unit includes a variable power supply and power supply control logic. The power supply can be attached at one end to a power socket of the merchandise item and at the other end to the power supply unit. The cable control logic reads a power requirement from a charge adaptor logic located near the end of the cable connected to the merchandise item and communicates it over the power cable to the power supply control logic. The power supply control logic controls the variable power supply based, at least in part, on the power requirement so that the variable power supply generates a supplied voltage onto the power cable to power the merchandise item.

Abstract: A system for controlling electrical loads in a house, apartment, office or any living environment, comprising the following units: Smart load control unit (LCU), Remote control unit (RCU), Sensors unit (SU), Computer interface unit (CIU), Infrared control unit (IRU) and Keypad unit (KU). Each LCU is so devised as to replace a wall switch or other electrical load power control device and comprises means for controlling an electric power delivered to the load responsive to a user's commands. Each RCU comprises means for activating LCU units, and each SU comprises sensor means. Each unit further includes means for connecting by wireless to the other units to exchange data or commands therebetween.

Abstract: The present invention provides a power-supply device, which can continuously supply a voltage from a power supply to a load even if a breakdown of a circuit is generated. The power-supply device includes a booster circuit, a normally-closed bypass relay, a CPU, and a switching circuit. A first switch of the switching circuit is turned on by a switching signal from the CPU, and a second switch is turned on by a boosting request signal from a boosting request signal generator. In the case that one of or both the switching signal and the boosting request signal are not input to the switching circuit 14, because a coil of a bypass relay is not energized, a contact turns on, and a voltage is supplied from a DC power supply to the load through the contact.

Abstract: A device for classifying electrical contacting between a first connecting element of a battery and a second connecting element, which is directly or indirectly connected to an electrical load. A temperature sensor is provided for detecting the temperature of the first connecting element and/or of the second connecting element and a control device, which is coupled to the temperature sensor and which is configured, on the basis of a detecting signal of the temperature sensor, to classify the electrical contacting between the first connecting element and the second connecting element. A corresponding method and to a battery system, as well as a battery receiving system including such a device for classifying electrical contacting. Moreover, there is provided an electrical power supply system with such a battery system and such a battery receiving system.

Abstract: Methods, systems, and apparatus, for wirelessly controlling a power supply device that controls a load. A wireless adapter includes a wireless communication device that receives transmissions from a wireless controller, a serial interface for a serial data connection to a power supply processing device integrated in the power supply device, an adapter processing device that receives the control signals the wireless communication device outputs, generates the control commands from the control signals, and outputs the control commands to the serial interface to cause the power supply processing device to control power provided to the load in a manner specified by the control commands, and an adapter power circuit that receives regulated direct current (DC) power from the power supply device and is powered from the regulated DC power received, and provides power to the wireless communication device and the adapter processing device.

Abstract: A power supply system includes a battery and a power management system. The power management system is coupled to the battery and to an external power source that is operable to charge the battery using a first charge level. The power management system is operable to determine that a battery power level of the battery is greater than a first predetermined level that depends on a battery storage option and, in response, disable power from being supplied from the external power source such that power is supplied from the battery until the battery power level is below the first predetermined level. The power management system is also operable to determine that the battery power level of the battery is less than the first predetermined level and, in response, charge the battery with a second charge level that is less than the first charge level until the battery power level is above a second predetermined level that depends on the battery storage option.

Abstract: A system comprises an AC/DC adapter having a connector. The system also comprises a portable computer that receives said connector. The portable computer comprising a delay circuit coupled to a power transistor that is coupled in parallel with a resistor. The delay circuit causes the power transistor to activate following a time delay after current from the adapter begins to flow through the resistor. As a result of a user beginning to remove the connector from the portable computer, a control transistor is activated to reset the delay circuit.

Abstract: A voltage conversion circuit apparatus that adjusts a timing skew between the switching control of the first switching element and the switching control of the second switching element includes: a skew storage portion that stores a timing skew between the switching controls of the first and second switching elements after the voltage conversion circuit apparatus is manufactured; and a timing adjustment portion that corrects the stored timing skew and thereby adjusts the timing relation between a first pulse signal and a second pulse signal so as to bring within a permissible range the timing skew that occurs when the switching controls of the first and second switching elements are performed by using the first pulse signal and the second pulse signal.

Abstract: A power supply management apparatus and a burglarproof power supply system that uses the power supply management apparatus. The power supply management apparatus manages power supplied to an electronic apparatus, such as a vehicle, a solar apparatus, a mobile communication apparatus or a notebook computer that need power to operate. The power supply management apparatus includes a battery, a management module, a power outputting port and an operation module. A user is allowed to command the management module, by using the operation module, to generate management power that is output to the electronic apparatus. If the output management power does not satisfy the requirements for actuating the electronic apparatus, the actuation of the electronic apparatus is restricted under an inoperable condition. Therefore, a burglarproof effect is achieved, a risk that the electronic apparatus is stolen is greatly reduced, and a standby time of the electronic apparatus is increased.

Abstract: An area efficient distributed device for integrated voltage regulators comprising at least one filler cell coupled between a pair of PADS on I/O rail of a chip and at least one additional filler cell having small size replica of said device is coupled to said I/O rails for distributing replicas of said device on the periphery of said chip. The device is coupled as small size replica on the lower portion of said second filler cell for distributing said device on the periphery of said chip and providing maximal area utilization.

Abstract: A method and system for aggregating messages. In one embodiment, the system comprises a plurality of distributed generators (DGs) and a controller, communicatively coupled to the plurality of distributed generators, for (i) receiving a plurality of messages from the plurality of DGs, (ii) correlating at least two messages in the plurality of messages based on at least one time parameter, and (iii) generating a summary message based on the at least two messages.

Abstract: A portable electronic apparatus is connected to a power supply device via a transmission line, and it includes a designated connector, a charge control circuit, and a judgment circuit. The designated connector includes five terminals respectively corresponding to five pins of a USB connector of the power supply device. When the power supply device is connected to the portable electronic apparatus, the first terminal of the designated connector is logic high, the fourth terminal of the designated connector is logic high, and the third terminal of the designated connector is logic high after pulling up the voltage level of the second terminal, the judgment circuit pulls down the voltage level of the third terminal and detects the voltage level of the third terminal so as to generate a determining result for determining a type of the power supply device.

Abstract: A smart device is discussed, which is connected to a smart grid to perform a power saving function. According to an embodiment, the smart device includes a power information receiving unit configured to receive power information through the smart grid network; a power saving control unit configured to perform the power saving function for at least one apparatus based on the power information in a power saving mode; at least one mode switching unit configured to switch from the power saving mode to a manual mode according to a user command; and a manual mode operational time determining unit configured to determine a manual mode operational time for operating the at least one apparatus in the manual mode, the at least one mode switching unit further configured to switch from the manual mode back to the power saving mode, automatically, when the manual mode operational time expires.

Abstract: An exemplary power supply circuit for providing a driving voltage to a load includes a pulse width modulation (PWM) control circuit, a transformer, a voltage output terminal, and a temperature compensation circuit. The PWM control circuit is configured for outputting a pulse signal. The transformer is configured for converting a first direct current (DC) voltage to a second DC voltage according to the pulse signal. The voltage output terminal is configured for outputting the driving voltage based on the second DC voltage. The temperature compensation circuit includes a temperature sensor for detecting an operation temperature of the load and correspondingly generating a detecting signal, and a feedback signal transmitter for outputting a feedback signal based on the detecting signal. The PWM control circuit adjusts a duty ratio of the pulse signal according to the feedback signal outputted by the temperature compensation circuit.

Abstract: A power adapter comprises a microprocessor, a wireless communication module, a relay, a circuit board, a casing, a power input end, and a power output end. The microprocessor generates a switching signal according to a wireless control signal. The wireless communication module receives the wireless control signal and transmits the wireless control signal to the microprocessor. An input end of the relay electrically coupled to the power input end receives an alternative current (AC) power, and a control end of the relay electrically coupled to the microprocessor receives the switching signal. The relay outputs the AC power from the input end to the output end of the relay electrically coupled to the power output end according to the switching signal. The structure of the power input end corresponds to a power outlet. The structure of the power output end corresponds to a power plug of an electrical appliance.

Abstract: An electronic device for managing energy is described. The electronic device includes a voltage sensor module that monitors a voltage waveform. The voltage sensor module includes discrete components. The electronic device includes a current sensor module that monitors a current waveform. The current sensor module includes discrete components. The electronic device is coupled to the voltage sensor module and to the current sensor module. The computing module determines a phase margin based on the voltage waveform and the current waveform. The electronic device includes a control module coupled to the computing module. The control module controls a load based on the voltage waveform, current waveform and phase margin. The control module includes discrete components. The voltage sensor module, the current sensor module, the computing module and the control module are housed within a wall box.

Abstract: A system and method for directing a user to configure a power device via an alphanumeric user interface is provided. The power device may include data storage storing a plurality of operational parameters. The method includes acts of prompting, during an initial power-up of the power device, a user to enter an indication of quality of power supplied to the power device, receiving the indication via the user interface, determining a first value for each of the plurality of operational parameters of the power device based at least in part on the indication and applying each first value of the plurality of operational parameters to the power device.

Abstract: Example subject matter disclosed herein relates to apparatuses and/or devices, and/or various methods for use therein, in which an application of an electric potential to a circuit may be initiated and subsequently changed in response to a determination that a snapback event has occurred in a circuit. For example, a circuit may comprise a memory cell that may experience a snapback event as a result of an applied electric potential. In certain example implementations, a sense circuit may be provided which is responsive to a snapback event occurring in a memory cell to generate a feed back signal to initiate a change in an electric potential applied to the memory cell.

Abstract: The feature of the present invention consists in: a processor main circuit for executing program instruction strings on a processor chip; a substrate bias switching unit for switching voltages of substrate biases applied to a substrate of the processor main circuit; and an operation mode control unit for controlling, in response to the execution of an instruction to proceed to a stand-by mode in the processor main circuit, the substrate bias switching unit in such a way that the biases are switched over to voltages for the stand-by mode, and for controlling, in response to an interruption of the stand-by release from the outside, the substrate bias switching unit in such a way that the biases are switched over to voltages for a normal mode, and also for releasing, after the bias voltages switched thereto have been stabilized, the stand-by of the processor main circuit to restart the operation.

Abstract: A power converter capable of activating a control circuit therein without increasing a length of a wiring for conveying an external activation signal. In the power converter, a converter circuit isolates a first voltage of a first power supply, converts the first voltage into a second voltage, and outputs the second voltage to a second power supply. A first power supply connecting circuit connects the first power supply to the converter circuit in response to the activation signal. An activation circuit determines whether or not the activation signal has been received by the first power supply connecting circuit on the basis of a voltage between input terminals of the converter circuit and activates the control circuit when it is determined that the activation signal has been received by the first power supply connecting circuit.

Abstract: In a voltage booster apparatus, a charge control transistor is turned on to charge a coil output capacitor and a booster output capacitor and then turned off, thereby confirming rise of a coil output voltage and a booster output voltage. A power supply relay is turned on to restore a booster operation thereby to check rise of the booster output voltage. If both of a step-up FET and a step-down FET are not in short-circuit failure, ON state of the power supply relay is fixed thereby to restore a power steering system operation.

Abstract: A method for optimizing the parameter setting of at least one energy supply parameter of a field device power supply module. The field device power supply module is, in such case, connected exclusively to one field device. The connected field device is supplied with electrical energy by the field device power supply module. In the method, the system composed of field device and field device power supply module is operated and a parameter setting of at least one energy supply parameter varied. In such case, the operation of the field device is monitored. Parameter settings are ascertained, in the case of which a relatively low energy consumption of the field device and simultaneously a safe operation of the field device can be realized in the relevant operational phase.

Abstract: Systems and methods for providing variable-frequency soft start of an AC load are disclosed. In one exemplary embodiment, a method for starting an alternating current (AC) load with a variable-frequency AC power output includes receiving an indication of a duty cycle for chopping the AC power output during starting of the AC load, and determining a frequency of the AC power output. The method further includes chopping the AC power output at the duty cycle, based on the determined frequency of the AC power output, and providing the chopped AC power output to start the AC load.

Abstract: In one aspect, a method of reducing power consumption in a circuit by adaptive bias current generation of a bias current configured to bias, at least in part, at least one amplifier of the circuit is provided. The method comprises establishing the bias current based, at least in part, on a reference frequency of a reference clock providing a clock signal to at least one component of the circuit, and changing the bias current in response to a change in the reference frequency of the at least one reference clock, the bias current being change non-linearly with respect to the change in the reference frequency of the at least one reference clock. In another aspect, the method comprises establishing the bias current based, at least in part, on a capacitance of a reference capacitor, and changing the bias current in response to a change in the capacitance of the reference capacitor such that the bias current is changed non-linearly with respect to changes in the capacitance of the reference capacitor.

Abstract: A current providing system, for providing an output current, which comprises: a frequency detecting circuit, for receiving at least one input signal, and for detecting a frequency of the input signal; a frequency-controlled current providing circuit, for providing the output current according to the input signal frequency when the input signal frequency is in a first predetermined range; and a predetermined current providing circuit, for providing the output current with a first predetermined current value, when the input signal frequency is not in the first predetermined range.

Abstract: A power supply includes a direct current (DC) voltage converter, a display, a voltage output interface, and a main controller. The DC voltage converter is connected to a voltage terminal of a peripheral interface. The display displays an input interface to allow a voltage value to be inputted therein. The main controller includes a voltage obtaining module and a control module. The voltage obtaining module is used to obtain the inputted voltage value, and output the inputted voltage value. The control module is used to output a pulse width modulation (PWM) signal to the DC voltage converter according to a proportion relationship between the inputted voltage value and the value of a predetermined voltage value. The DC voltage converter is used to convert the first voltage into a second voltage according to the PWM signal, and outputs the second voltage through the voltage output interface.

Abstract: A client device manages consumption of power supplied by an electric utility to one or more power consuming devices. Power flow to the power consuming devices is controlled by one or more controllable devices, which are controlled by the client device. The client device receives a power control message, such as from a remote system controller. The power control message may have been issued in furtherance of a power reduction event initiated by the electric utility. The power control message indicates an amount of electric power to be reduced and/or identification of at least one controllable device to be instructed to disable a flow of electric power to one or more associated power consuming devices. Responsive to the power control message, a flow of electric power is disabled or otherwise reduced to at least one power consuming device based on the contents of the power control message.

Abstract: A power supply to provide electrical power to one or more loads. The power supply may include a resonant air core transformer to provide an adjustable and adaptable source of power to electronic devices. The power supply may include isolated primary-side circuitry and secondary-side circuitry. The primary-side circuitry may include control circuitry that, among other things, provides drive waveforms for the primary-side switching circuitry. In embodiments configured to produce AC output, the secondary-side circuitry may also include switching circuitry. The primary-side control circuitry may provide drive waveforms for the secondary-side switching circuitry. The secondary-side circuitry may include measurement circuitry that measures the current and/or voltage of the output and provides those measurements to the control circuitry through isolation circuitry. The control circuitry may adjust the drive waveforms for the primary-side and/or secondary-side switching circuitry as a function of the measured values.

Abstract: A controller and methodology for a power supply are disclosed. The controller includes output channels for providing a pulse width modulation (PWM) voltage signal for driving a load, for example, a microprocessor. Each channel provides a portion of the PWM signal. The controller receives user input information and uses that information to automatically determine window sizes. A window size defines the maximum output current level for a given window. The controller uses feedback signals to determine the current being drawn by the load, and selects the number of windows and channels that are needed to adequately provide that current. The controller selectively activates and deactivates the output channels accordingly. In response a change in the user input information the controller automatically adjusts the window sizes.

Abstract: An image processing apparatus that is capable of being instructed to power off, by a power switch or a command from an external apparatus, and is capable of executing the restart thereof under appropriate conditions. When power-off is instructed, shutdown is started. Upon completion of the shutdown, if the power switch is on, and at the same time the power-off has been instructed by the power switch of the apparatus, the restart of the apparatus is executed, whereas upon completion of the shutdown, if the power-off has been instructed by a command from the external apparatus, the restart of the apparatus is not executed.

Abstract: An LED driver circuit operating from the AC power line providing high efficiency, good line and load regulation, high power factor, low line current harmonics, low conducted EMI, high LED utilization, and lamp dimming compatibility, while consisting of a minimal number of components. No inductors, nor capacitors (including electrolytics), nor high current switching transistors are employed. The top of a string of series connected LED segments is connected to the output of a rectifier, which in turn is connected to an AC sine wave power source. The string is tapped at various locations, including the bottom of the string. Each segment can consists of any number of serial or parallel connected LEDs. Current control elements or regulators sink current at each tap and are sequentially turned on and off one at a time, tracking the rectified sine wave voltage. Voltage across each regulator and current when conducting is individually controllable.