Abstract: The present invention relates to a wireless charger for a mobile communication terminal, which allows charging a plurality of batteries in a conveniently way without any terminal connection of the batteries to chargers for various mobile communication terminals such as a cellular phone and PDA and also allows intercepting electromagnetic waves while the charger is used, by means of Faraday's law. The wireless charger of the present invention includes a charger body having an electromagnetic wave intercepting means; a charging pad received in the charger body; and at least one battery that is to be charged by means of induced electromotive force generated by the charging pad, wherein the charger body includes a power supply means, a housing having a receiver for receiving the charging pad and connected to the power supply means, and a cover hinged to the housing.

Abstract: A power factor correction converter includes an output voltage error amplifier which functions as a proportioning device in a low-frequency range in order to stabilize the output voltage by feedback control and obtains a reference current amplitude value vm by multiplying an error ev between a desired output voltage value Vref and a detected output voltage value vo by a predetermined proportionality factor. A factor element multiplies the reference current amplitude value by a predetermined factor and adds the resulting value to a reference value to obtain a desired output voltage value. The factor element functions as a low-pass filter by changing the desired output voltage value Vref in accordance with the reference current amplitude value vm in a low-frequency range and reducing the factor value in a high-frequency range.

Abstract: A method is specified for operating a rotating electrical machine, in which the rotating electrical machine is connected in terms of phase to a converter circuit, having a DC voltage circuit, for connecting at least two voltage levels, and the phases of the converter circuit are connected to the DC voltage circuit in accordance with a selected switching state combination of switching states for power semiconductor switches in the converter circuit. In order for operation of the rotating electrical machine to be possible in an event, over a number L of sampling times various values are determined, and a switching state combination is set as the selected switching state combination with which a sum of determined values is at its smallest.

Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.

Abstract: A power device includes a power supply module, a first electrical isolation unit, a second electrical isolation unit, a feedback control unit, and a comparing unit. The power supply module includes a feedback compensating terminal and an output terminal, the feedback compensating terminal provides a related voltage of output power, and the output terminal provides an output voltage. When the related voltage of output power is smaller than the predetermined voltage, the comparing unit controls the first electrical isolation unit to change operation of the feedback control unit and the second electrical isolation unit, to allow the power supply module to adjust the output voltage.

Abstract: A method and apparatus for converting DC input power to AC output power. The apparatus comprises a conversion module comprising an input capacitor, and a first feedback loop for determining a maximum power point (MPP) and operating the conversion module proximate the MPP. The apparatus additionally comprises a second feedback loop for determining a difference in energy storage and delivery by the input capacitor, producing an error signal indicative of the difference, and coupling the error signal to the first feedback loop to adjust at least one operating parameter of the conversion module to drive toward the MPP.

Abstract: A switching power supply includes an energy-storing device, a power switch, a driving circuit and a thermal sensing device. The energy-storing device is coupled to an input power source and controlled by the power switch to increase or decrease the power therein. The power switch has a control terminal connected to the driving circuit for switching. The thermal sensing device is connected to the control terminal of the power switch and powered by the driving circuit. When sensing an operation temperature exceeding a predetermined range, the thermal sensing device disables the driving circuit.

Abstract: In a method for optimizing a space vector pulse width modulation, a voltage is connected to a load, by combining discrete switching states of a plurality of switches to control the load, the load being switched to zero potential by two of the switching states. In the case the maximum degree of control is increased, during a pulse width modulation period, at least one of the switching states, that switches to zero potential, is omitted.

Abstract: A method and circuit for controlling feedback in, for example, a power factor converter circuit. A current sense signal is compared with a reference signal to generate a comparison signal. A clipped signal is generated from the comparison signal where the signal is a periodic waveform that transitions between two levels that are symmetrically positioned about a reference signal. The clipped signal is used to generate a summed signal at the input of an integrator. The integrator generates a feedback signal suitable for use in, for example, a power factor converter circuit.

Abstract: The present technology is generally related to Triac dimmer compatible driving circuits and methods thereof. The present technology also provides an electronic transformer that is integrated in the Traic dimmer compatible driving circuit. In one embodiment, the electronic transformer detects the conduction angles of an output AC voltage from the Triac dimmer and converts said output AC voltage into a PWM DC voltage having a duty cycle regulated by said conduction angles. Said PWM DC voltage is then applied to a WLED driver for driving a WLED.

Abstract: A rotating electrical machine control device includes an inverter; a resolver; a unit; a three-phase/two-phase modulation switching unit; and a motor control unit that switches to a two-phase modulation in a specific region where an electric noise given to the resolver by a rotating electrical machine is large, even in a region where the modulation ratio is smaller than the three-phase/two-phase modulation switching boundary.

Abstract: Embodiments of the invention relate to a method and apparatus for a zero voltage processor sleep state. A voltage regulator may be coupled to a processor to provide an operating voltage to the processor. During a transition to a zero voltage power management state for the processor, the operational voltage applied to the processor by the voltage regulator may be reduced to approximately zero while an external voltage is continuously applied to a portion of the processor to save state variables of the processor during the zero voltage management power state.

Abstract: Provided are a voltage application time period measuring circuit which does not require a battery, and a power supply apparatus including the voltage application time period measuring circuit. Each of a voltage application time period memory (32) and a set time period memory (33) is a nonvolatile memory, and hence it is unnecessary to provide a battery for holding information stored in each of the memories in the outside of the voltage application time period measuring circuit (30) and a power supply apparatus cost is reduced correspondingly.

Abstract: An apparatus for monitoring current for a motor drive including at least high-side and low-side switching transistors includes a driver circuit for driving a gate of the low-side switching transistor. First circuitry measures a drain to source voltage across the low-side switching transistor and generates a voltage output responsive thereto. Second circuitry has a first state of operation that samples the voltage output of the first circuitry when the low-side switching transistor is turned on and has a second state of operation to sample the voltage output of the first circuitry when the low-side switching transistor is turned off. The second circuitry further generates a monitored output current responsive to the sampled voltage output.

Abstract: An interleaved-PWM power module system and method for operating the same are disclosed. The power system includes at least two power modules, each of which has a specific ID number. The power module with an extreme value of the specific ID number is set as a master power module and the remaining power modules are set as slave power modules. The master power module sends the sync signal to all of the slave power modules. Each of the slave power modules performs a phase-locking operation with reference to a specific phase offset to generate a frequency switching signal, where the frequency switching signal is synchronized with the sum of the sync signal and the phase offset for each slave power module. The power module outputs the frequency switching signal for PWM signal generation.

Abstract: A method of operating an inverter for converting a DC power into AC power by use of a pulse width modulation switching scheme is provided is disclosed. The inverter is controlled by use of the pulse width modulation switching scheme to provide an alternating current based on a current demand signal defining an alternating current provided by the inverter. An upper current threshold and a lower current threshold are provided. An instantaneous value of the alternating current is measured. When the instantaneous value of the alternating current overshoots the upper current threshold or undershoots the lower current threshold, the pulse width modulation switching scheme is replaced by an amended switching scheme which controls the instantaneous value of the alternating current to be between the upper current threshold and the lower current threshold. The upper current threshold and the lower current threshold oscillate with at least one alternating phase.

Abstract: A contactless power receiver is provided with a dynamically tuned pick up coil. The power transfer capacity of this power receiver is dynamically tuned using semiconductor devices that are operated in linear mode over part of their operation. The semiconductor devices are driven by a controller that is configured to implement a range of control strategies depending on system requirements. The semiconductor device may be used by itself or in conjunction with reactive elements to dynamically tune the pick up coil. In some implementations the contactless power receiver maybe configured to work with a consumer electronic or a wireless sensor device. The contactless power receiver can be integrated with the energy storage component of the device to provide a retrofit solution for existing products. The device can then be placed in vicinity of a planar magnetic field generated by a charging pad.

Abstract: A system is provided for the feeding of an inductive load, with electric power of continuous current, generated from an energy source and, more in particular, to a feeding system for a vibratory pump from solar or aeolic energy, which processes the electric power of continuous current supplied by a bank of solar cells or aeolic generator, in a compatible form, using a circuit of electronic command by digital micro controller, for the control and actuation of vibratory pump, independent of the electric power variations supplied by the sources as solar cells, due to the alterations in the level of solar radiation; or in aeolic generator, due to wind speed variations.

Abstract: A power distribution system comprises a power conversion module for performing power conversion between a DC voltage at a DC side and an AC power at an AC side, and a conversion control system. The AC side of the power conversion module is electrically coupled to a grid. The conversion control system includes a phase-locked-loop circuit for receiving a multi-phase reference signal of a grid voltage and for generating a synchronized signal, a regulator for receiving reference commands, a two-phase grid feedback signal, and the synchronized signal and for generating a control signal for the power conversion module, and a phase compensation circuit for receiving the synchronized signal and the multi-phase reference signal of the grid voltage, for obtaining a phase displacement signal, and for generating a phase compensation signal for compensating the reference commands or for compensating the synchronized signal when the phase displacement signal exceeds a threshold value.

Abstract: Electronic circuits couple energy storage devices, such as double layer capacitors or rechargeable battery cells, to a power supply output, thereby improving noise suppression and extending ride-through capability of the power supply. In a typical circuit, an energy storage device is coupled in series with a switch that controls the charging current into the energy storage device. The switch is controlled by a comparator that receives a signal related to the voltage level of the power supply. In some embodiments, the comparator also receives a feedback signal related to a charging current flowing into the energy storage device. The circuit is configured so that the switch limits the charging current to a predetermined current level, or does not allow the charging current to flow until the output voltage of the power supply reaches a predetermined voltage level.

Abstract: A battery-voltage detection circuit comprising: a first-capacitor; an operational-amplifier; a second-capacitor; a voltage-application-circuit to sequentially apply one and the other-battery-terminal-voltages to the other-first-capacitor-end; a discharge circuit to allow the second-capacitor to discharge before the other-battery-terminal-voltage is applied to the other-first-capacitor-end; a constant current circuit to output a constant-current causing predetermined-speed-discharge of electric charge accumulated in the second-capacitor in response to a discharge-start-signal input after voltage is applied to the other-first-capacitor-end; a comparator; and a measurement-circuit to measure a time-period from a time when the discharge-start-signal is input until a time when an comparator-output-signal changes to one logic level as a time-period corresponding to a battery-voltage, at least one of the operational-amplifier and the comparator being provided with an offset so that the comparator-output-signal chang

Abstract: An integrated circuit and method for monitoring and controlling power and for identifying an open circuit state at an output port is disclosed. A circuit is implemented to determine whether an open circuit state exists based on a comparison of data received from the output port and attached loads. The data received from the output port and attached loads is compared to a minimum open circuit current value of the output port, wherein the minimum open circuit current value is based on the hardware characteristics of the output port and attached loads. A possible open circuit state at the output port is reported based on the comparison.

Abstract: An electrical power conversion system and method for connecting an electrical power source to an electrical grid, the system comprises an input module for generating a high voltage DC power signal from a variable low DC power signal of the electrical power source based on a voltage command. The system further comprises an output module connected to the high voltage DC power signal for generating an AC power signal with a peak voltage based on said voltage command according to a frequency command and a phase command. The system further comprises an electrical grid interface for selectively connecting said AC power signal to the electrical grid and to measure an electrical grid waveform for generating an electrical grid measurement including voltage, phase and frequency.

Abstract: An internal voltage generation circuit includes a signal generation unit which generates first and second level signals and first and second control signals from a reference voltage generated by voltage-dividing an internal power and generates first and second driving signals by comparing levels of the internal power and the reference voltage, a driving control unit which receives the first and second level signals and drives the internal voltage in response to an active signal, and a driving unit which receives the first and second driving signals and drives the internal voltage.

Abstract: A power supply circuit includes continuous conduction mode power factor correction (PFC). The PFC may be performed by generating a carrier signal voltage at a beginning of a switching cycle of the power supply, generating a sampling voltage indicative of drain current of a drive transistor, and detecting when the carrier signal voltage has decreased to the same level as the sampling voltage at an intersection time. The ON time of the drive transistor may be set to twice the intersection time.

Abstract: A power conversion driving circuit is provided. The power conversion drive circuit includes a converting circuit, a control circuit and a load circuit. The converting circuit is coupled to an input voltage. The control circuit is coupled to the converting circuit for controlling the converting circuit to convert the input voltage to an output voltage. The load circuit includes a load detecting unit and a load. The load is coupled to the output voltage, and the load detecting unit is coupled to a detecting voltage source. The load detecting unit generates a load detecting signal to re-start the control circuit when the load circuit is inserted into the power conversion driving circuit.

Abstract: A multi-phase voltage regulator comprises a plurality of current supplying stages, each current supplying stage configured to supply a local output current equaling at least a portion of a load current output from the multi-phase voltage regulator; and a plurality of control circuits, each control circuit coupled to a respective one of the plurality of current supplying stages, wherein each control circuit calculates a control signal based, at least in part, on a sampled current representative of the respective local output current and a sampled current representative of a master output current. The control signal from each control circuit causes the respective current supplying stage to be disabled gradually over a first time interval if the sum of the local output current and the master output current is detected as being below a respective first predetermined level.

Abstract: A power system interconnection system includes: a voltage detecting section configured to detect voltage values of a power system line to generate detection voltage values; and a PWM signal generating section configured to generate a PWM signal such that an output voltage follows the detection voltage values. A voltage converting circuit is configured to generate and supply the output voltage to the power system line by performing a pulse-width-modulation control on the power supplied from a power supply based on the PWM signal.

Abstract: A circuit for reducing the variations of auto-supply voltage of a control circuit of a switching power supply, where the control circuit supplies an activation or deactivation signal of a power transistor, includes an auto-supply voltage generator, a controlled switch capable of selectively connecting the generator to the control circuit, and a driving circuit of the controlled switch that supplies a closing signal of the controlled switch after a predefined delay of time starting from the deactivation command.

Abstract: An internal voltage generator includes a pull-up driver to pull-up drive a supply terminal of an internal voltage, a pull-down driver to pull-down drive the supply terminal of the internal voltage, a pull-up driving control unit to turn on the pull-up driver when a first feedback voltage corresponding to the internal voltage becomes lower than a reference voltage, and a pull-down driving control unit to turn on the pull-down driver when a second feedback voltage becomes higher than the reference voltage, the second feedback voltage having a voltage level corresponding to that of the internal voltage and lower than that of the first feedback voltage.

Abstract: A voltage stabilizing module for bicycle generator includes a voltage input, a rectifier circuit electrically connected to the voltage input, a detective switch electrically connected to the rectifier circuit, a stabilizing integrated circuit selectively electrically connected to the detective switch, a filter circuit electrically connected to the stabilizing integrated circuit, and a voltage output electrically connected to the filter circuit.

Abstract: A device (1) for supplying electric current to the fuel pump (2) of a motor vehicle internal combustion engine (3) comprises a DC/DC converter (13) which increases voltage to a predetermined value in the event of a voltage drop of a direct current source (7). This ensures an adequate voltage supply of the fuel pump (2) even at low voltages of the direct voltage source. When the voltage (15) of the direct voltage source (7) is sufficient, the DC/DC converter (13) is bridged, so that the fuel pump (2) is directly supplied with fuel from the direct voltage source (7). The DC/DC converter is also bridged when the device is faulty.

Abstract: A first comparator compares an output voltage Vout appearing at a capacitor with a maximum threshold voltage Vmax. A second comparator compares the output voltage Vout with a minimum threshold voltage Vmin. An edge detection circuit detects an edge of a synchronization signal SYNC having approximately ½ of frequency of the output voltage Vout and outputs an edge detection signal SE. A charge-discharge control unit refers to the first and the second comparison signal, and sets the charge-discharge circuit to a discharging state when the output voltage Vout becomes higher than the maximum threshold voltage Vmax and sets the charge-discharge circuit to a charging state when the output voltage Vout becomes lower than the minimum threshold voltage Vmin. When the edge signal SE becomes the predetermined level, the charge-discharge control unit switches the charging state and the discharging state of the charge-discharge circuit.

Abstract: A system comprises a load and a voltage regulator. The voltage regulator is configured to select a gate drive signal from among a plurality of input voltages. The voltage regulator is configured to use the selected gate drive signal to turn on a power transistor to produce a regulated voltage for the load.

Abstract: Method and apparatus for adding jitter to an oscillator for reducing EMI are disclosed An oscillator circuit includes an oscillator configured to generate a first clock having a first frequency and a frequency jitter circuit including a charge pump configured to charge and discharge first and second capacitors repeatedly for obtaining a time-varying voltage having a second frequency. The time-varying voltage is coupled to the oscillator to vary the first frequency within a frequency range. The charge pump includes a first switch for coupling the first capacitor to a voltage source and a second switch for coupling the first capacitor to the second capacitor. A charge transfer between the first and second capacitors is configured to provide the time-varying voltage.

Abstract: The power converter for solving the above-described problem has a module section and a drive section for operating the module section. The drive section has a drive circuit. The drive circuit is provided so as to correspond to the first semiconductor element which is one of the semiconductor elements comprising the parallel circuit; wherein drive signals for operating the first semiconductor element are output. The drive signals that are output from the drive circuit are electrically branched and output to a second semiconductor element which is a separate semiconductor element from the first semiconductor element of the semiconductor elements comprising the parallel circuit. As a result, the second semiconductor element receives the branched drive signals and operates in the same manner as the first semiconductor element. Thereby, a motor converter favorable for control large current at a low cost is provided.

Abstract: A switched-mode power supply includes a soft-burst circuit to minimize or prevent distracting audible noise. The power supply includes a control circuit for controlling switching of an output transistor to deliver a regulated output voltage to a load. The control circuit adjusts the operating frequency of the power supply based on a control signal. The soft-burst circuit discharges a storage device to minimize or prevent audible noise when the control signal reaches a particular level.

Abstract: An inverter control device includes a DC power supply for outputting a first DC voltage, a voltage conversion unit for converting a voltage level of the DC voltage and supplying a first DC voltage to an inverter, a temperature detection unit for detecting an ambient temperature (element temperature) of the inverter, and a control device. The control device controls the voltage conversion unit such that the voltage VH lowers as the ambient temperature is lower, based on a temperature value representing a result of detection by a temperature sensor. A tolerable surge amount can thus sufficiently be ensured at a low temperature.

Abstract: An electronic ballast including a rectifying circuit to provide a signal representative of the current signal associated with a buck inductor, a monitoring circuit to provide a monitoring circuit signal when the signal representative of the buck inductor is within a specified range, and a comparing circuit coupled to the rectifying circuit and the monitoring circuit and operable to alter the output of the power converter circuit driving the lamps in response to comparisons between the signals from the rectifying circuit and the monitoring circuit to control power conditions in the ballasts.

Abstract: A method of performing loadflow calculations for controlling voltages and power flow in a power network by reading on-line data of given/specified/scheduled/set network variables/parameters and using control means, so that no component of the power network is overloaded as well as there is no over/under voltage at any nodes in the network following a small or large disturbances.

Abstract: The present invention discloses a power converter with extremely low standby power consumption for converting an input AC power to an output DC power, comprising: a DC supply voltage generating unit, used for generating a DC supply voltage; a pulse width modulation controller, used for generating a pulse width modulation signal according to a feedback voltage of the output DC power; and an isolated actuating switch, placed between the DC supply voltage generating unit and the pulse width modulation controller, for controlling the supply of the DC supply voltage to the pulse width modulation controller, according to a switch signal from a loading device.

Abstract: The present invention is intended to prevent the flow of a large input current into a DC/DC converter, to which power is fed from a power supply, before a supply voltage delivered from the power supply reaches a rated output voltage. A control unit included in the DC/DC converter includes a steady state detection block that detects a condition in which an input voltage to be applied to the DC/DC converter has been stabilized, and inhibits the power feed from the DC/DC converter until the input voltage delivered from a power supply in a preceding stage is stabilized.

Abstract: In one embodiment, a power conversion system may include a controller to cause a power stage to control power to or from an energy storage device. In another embodiment, a power conversion system may include a push-pull stage and an energy storage device following the push-pull stage. In another embodiment, an integrated circuit may include power control circuitry to provide power control to a power converter, and a power switch coupled to the power control circuitry to operate the power converter. In another embodiment, a power conversion system may include two or more power converters having power control.

Abstract: A method and device for providing redundant control of a controllable current valve in a converter of a power transmission system. A first converter control unit sends a first valve control signal. A first active/standby indicator is associated with the first converter. A second converter control unit sends a second valve control signal. A second active/standby indicator is associated with the second converter control unit. The device also includes a valve control unit. An active/standby indicator indicates if a corresponding converter control unit is active or standby. Only one indicator indicates an active unit at a given point in time. The valve control unit receives the active/standby indicators and valve control signals, selects a valve control signal to be applied if the corresponding active/standby indicator indicates an active converter control unit and controls the current valve using the selected valve control signal.

Abstract: A circuit and method of determining the power output for a converter circuit includes determining a time averaged voltage from a rectified voltage of a winding of the transformer and multiplying the time averaged voltage by a constant determined at least in part by an average current of a winding of the transformer. By one approach, a rectified voltage from a primary side of the transformer is time averaged using a filter circuit. The current can be known or preset or controlled by the converter circuit such that the time averaged voltage reading, assuming a constant current, can be compared to a preset voltage such that the voltage reading approximates a power reading for the transformer. By another approach, the time averaged voltage is multiplied by the current to obtain a power output reading.

Abstract: Among many embodiments, a power conversion apparatus and a method for converting power are disclosed. The power conversion apparatus may include switching components configured to create an alternating current; a preemptive detector arranged and configured to provide, in advance of the alternating current reaching a zero-crossing, a control signal responsive to the alternating electrical current approaching the zero-crossing; and a controller configured, at least in part, to change a state of the switching components before the zero crossing, in response to the control signal.

Abstract: There is provided an integrated control method for eliminating a low frequency ripple in a power conversion system for a fuel cell, more particularly, a control method of a power conversion system capable of eliminating a low frequency ripple, controlling a DC link voltage, and controlling an output power and a system using the same control method. A power conversion system (PCS) that converts an output of a DC power supply received from an external power supply includes a converter that converts a voltage of the input power supply; an inverter that converts an output voltage of the converter into an AC voltage; and a converter control module that outputs a PWM signal for controlling a switch of the converter, and after receiving a power instruction value, the converter control module generates the PWM signal for controlling the converter based on the power instruction value.

Abstract: This invention discloses an AC/DC modulation conversion system, which comprises a control signal transmitter, a control signal receiver and a control signal/modulation signal converter. The control signal transmitter transmits a control signal, the control signal receiver receives the control signal, the control signal/modulation signal converter converts the control signal into a pulse width modulation signal or a DC level modulation signal. Therefore, this AC/DC modulation conversion system can be applied to controllable DC load circuits such as a controllable DC heater, a controllable DC motor or a controllable DC lamp etc for respectively controlling the temperature, speed or brightness etc.

Abstract: An inverter for converting the direct current provided by a solar generator to alternating current includes a control providing a control signal for a drive of the solar generator, for allowing tracking the solar generator after the sun, wherein the control is integrated in the inverter.

Abstract: A matrix converter includes a matrix converter main circuit, an input voltage detector group configured to detect an input voltage of an alternating current source, a gate driver configured to drive a bidirectional switch, and a controller having a pulse width modulation operation unit and a commutation operation unit. The pulse width modulation operation unit is configured to fix one output phase in a conduction state, configured to pulse-width-modulate one of remaining two output phases by using all three input phases, and configured to pulse-width-modulate the other output phase by using only two input phases of a reference input voltage and a middle input voltage.