Abstract: A voltage adjusting circuit includes an inducing circuit configured to induce a voltage from electromagnetic waves, a first rectifying circuit configured to rectify an output signal of the inducing circuit, a second rectifying circuit configured to rectify the output signal of the inducing circuit, a first regulator configured to regulate an output signal of the first rectifying circuit, and a second regulator configured to regulate an output signal of the second rectifying circuit.

Abstract: Embodiments of the present invention relate to a rectifier circuit and methods of making the same for use in wireless devices (e.g., RFID tags). The present invention is drawn to a rectifier circuit comprising first and second diode-wired transistors in series, each having a gate oxide layers of the same target thickness. The first diode-wired transistor receives an alternating current and the second diode-wired transistor provides a rectifier output. The first and second diode-wired transistors are configured to divide between them a first voltage differential across the rectifier circuit. The gate oxides are exposed to a peak stress that is similar to a stress on the gate oxide of logic transistors made using the same process.

Abstract: An energy scavenging interface has an input port receiving an electrical signal from a storage element of a transducer, and an output port supplying an output signal to an electrical load. The interface includes a first switch receiving the input signal; a second switch that supplying the output signal; and control logic configured to close the first switch and open the second switch for a first time interval having at least a first temporal duration and until current through the first switch reaches a threshold. A scaled copy of a peak value of current through the first switch is obtained during the first time interval. The control logic is further operable to open the first switch and close the second switch to supply current to the electrical load as long as the current of the output signal remains greater than the value of said scaled copy of the peak value.

Abstract: A power adapter, including an AC input terminal, an AC-DC power converter, a DC-DC power converter, and an output terminal, wherein the AC-DC power converter and the DC-DC power converter are separate components, and wherein the power AC input terminal, AC-DC power converter, DC-DC power converter and the output terminal are connected sequentially via a plurality of cords.

Abstract: A voltage source converter for a HVDC power transmission system is disclosed. According to one aspect, the voltage source converter includes at least one phase element having series connected diodes configured to interconnect, in use, a DC network and an AC network. The voltage source converter further includes at least one auxiliary converter configured to act as a waveform synthesizer to modify the DC voltage presented to the DC side of one or more phase elements.

Abstract: A power supply switch apparatus includes a voltage decreasing circuit, a rectification circuit, a comparison circuit, and a control circuit. The voltage decreasing circuit receives a first alternating voltage output from a power supply and converts the first alternating voltage to a second alternating voltage. The rectification circuit receives the second alternating voltage and converts the second alternating voltage to a first direct voltage. The voltage regulating circuit receives the first direct voltage and converts the first direct voltage to a second direct voltage. The comparison circuit receives the second direct voltage, compares the second direct voltage with a reference voltage, and outputs a control signal. The control circuit receives the control signal and connects the power supply to different circuits according to the control signal.

Abstract: A rectification processor includes rectifier elements that control charge to batteries independently for each of the batteries. A charge-state detector detects charge states of the batteries from their voltages, and determines whether to select the batteries for charging in a half-cycle determined beforehand in accordance with the detected result. A synchronous signal detector detects a signal synchronized with the phase of the 3-phase alternate current (AC) generator from the 3-phase AC generator, and outputs a synchronous signal. A charge controller controls the charge in the rectification processor in synchronization with the 3-phase AC generator according to the synchronous signal from the synchronous signal detector, and, in accordance with the charge states of the batteries output from the charge-state detector, controls charge amounts to the battery/batteries that was determined for selection.

Abstract: A power supply unit has one end on the low potential side, said end being connected to a switching element on the power supply line side, and serves as an operation power supply for outputting a switch signal to the switching element. A switching element includes a first and a second electrode, and renders an electric current in only a direction from the second electrode to the first electrode conducting. A diode is connected in parallel to the switching element while the cathode thereof is directed to a power supply line. A capacitor has one end connected to the first electrode of the switching element and the other end connected to the other end of the power supply unit, and serves as an operation power supply for outputting a switch signal to the switching element.

Abstract: Device for operative connection between a subsea step out cabie far end and subsea toads such as pumps, compressors and control systems, distinctive in that the device is a subsea DC provider (SDCP), and it comprises: a SDCP unit for altering alternating current power received from the step out cable to direct current power for delivery to said loads, a gas and/or liquid filled vessel into which said unit is arranged, and the device is a SDCP for subsea location at a far end of a subsea step out cable connected to at least one AC power source at the step out cable near end, and the step out length is long, which means long enough to cause, stability problems at frequency and power levels feasible for subsea pump and compressor motors, and where the device via the step out cable receives input electrical power at a low enough frequency to have stable transmission and the device, operativeSy connected to the subsea motors, delivers a DC output electrical amperage and voltage feasible for operation of connected

Abstract: A voltage adjusting circuit is provided includes an inducing circuit configured to induce a voltage from electromagnetic waves, a first rectifying circuit configured to rectify an output voltage of the inducing circuit, a control circuit configured to control an output voltage of the first rectifying circuit in response to the output voltage of the first rectifying circuit, and a second rectifying circuit configured to simultaneously rectify and regulate the output voltage of the inducing circuit in response to the output voltage of the first rectifying circuit.

Abstract: A power supply circuit enabling provision of good energy efficiency and downsizing is provided. A power supply circuit 1 according to the present invention includes: input terminals 2, 2 connected to a commercial power supply 10; a winding 4 serially connected between the input terminals 2, 2 via input conductors 3; and a plurality of output terminals 6A, 6B connected to opposite ends of respective windings 4A and 4B resulting from dividing the entire winding 4 into a plurality of parts via output conductors, the respective output terminals 6A and 6B being independently connected to respective loads 20A and 20B.

Abstract: A three-phase reactor power saving device, comprising: a first capacitor set, connected electrically to a three-phase AC power supply, to store electric energy; a reactor set, connected electrically to said first capacitor set, to convert said electric energy into AC self-induced energy; a three-phase transformer, connected electrically to said reactor set, to boost said AC self-induced energy into boosted AC self-induced energy; a second capacitor set, connected electrically to said three-phase transformer, to store said boosted AC self-induced energy; a rectifier circuit, connected electrically to said three-phase transformer, to rectify current of said boosted AC self-induced energy into a DC current; a power regulating capacitor, connected electrically to said rectifier circuit; and a first DC reactor and a second DC reactor, connected electrically to said rectifier circuit, to output first DC self-induced energy and second DC self-induced energy to said load, to raise power saving efficiency.

Abstract: Exemplary embodiments are directed to power conversion. A device may include a controllable switch coupled between an AC network and a DC network. The device may further include control circuitry configured to modify a configuration of the switch based on a detected difference between a reference signal and an output signal at the DC network.

Abstract: The present invention is directed to an electrical supply apparatus having an input for connecting the electrical supply apparatus to a mains supply which provides an alternating voltage as input voltage, having an output for connecting the electrical supply apparatus to a load, wherein the output provides a DC voltage as output voltage, having a rectifier which rectifies the input voltage to form a rectified input voltage, having a PFC module which comprises a smoothing device for smoothing the rectified input voltage and an active power factor correction device, wherein the power factor correction device is designed to form a time-dependent supply current for the smoothing device depending on a time-dependent current form signal in such a way that a time-dependent input current in the PFC module is matched to the current form signal, wherein the current form signal is produced by an analogue circuit.

Abstract: A linear transformer power supply is disclosed that extracts a high level of energy from a linear transformer during the full cycle of AC input voltage.

Abstract: A common mode filter and a power supply device having the same are provided. The common mode filter includes a first inductor having a first winding number, a second inductor facing the first inductor and having a second winding number, a first intermediate terminal branching from an intermediate portion of a coil of the first inductor, and a second intermediate terminal branching from an intermediate portion of a coil of the second inductor. The effects of two filters are obtained from one common mode filter and the volume is reduced, so that a light, thin, short, and short module is provided.

Abstract: A power converter is provided that has an alternating-current (AC) to direct-current (DC) switched-mode power converter circuit that converts alternating-current power into direct-current power for powering an attached electronic device. Power can be conserved by automatically placing the power converter circuit in a low-power standby mode of operation whenever the electronic device is detached from the power converter. A monitoring circuit can be powered by a capacitor or other energy storage element while the power converter is operating in the standby mode. If the monitoring circuit detects an output voltage change that is indicative of attachment of the electronic device or if the storage element needs to be replenished, the monitoring circuit can place the power converter circuit in an active mode of operation.

Abstract: A method of controlling a photovoltaic system includes providing a photovoltaic device having a variable DC voltage output and a variable DC current output. The photovoltaic device has a combination of a voltage output level and a current output level corresponding to a maximum power point. A DC power supply is connected in a parallel and/or series combination with the photovoltaic device. A DC load is connected in series to the combination of the DC power supply and the photovoltaic device such that the load is powered by the combination. A characteristic of the DC power supply is adjusted such that the voltage output and the current output of the photovoltaic device substantially match the voltage output level and the current output level corresponding to the maximum power point or other desired power point.

Abstract: An isolated DC-DC converter includes a transformer, a main switch, an active clamp circuit and a control unit. The transformer has a primary winding. The main switch and the active clamp circuit are connected to the primary winding. The active clamp circuit has an auxiliary switch and a clamp capacitor connected in series. The control unit is provided for controlling the main switch and the auxiliary switch. The control unit performs a soft start operation of the converter before a normal operation. The control unit performs anti-saturation control before starting the soft start operation. The anti-saturation control includes an act of controlling the main switch and the auxiliary switch so that the auxiliary switch performs ON-OFF operation with the main switch kept OFF until voltage of the clamp capacitor drops below a level at which the transformer is to be magnetically saturated after starting the soft start operation.

Abstract: Apparatus and associated methods involve a controllable supply adapted for controlling switch phasing and pulse width to substantially equalize power in adjacent quadrants of a sinusoidal source voltage waveform to regulate reactive power drawn from the source. In an illustrative example, the supply may, in some embodiments, deliver power to a load at a level responsive to a commanded input signal. In some examples, the power supplied to the load may be adjusted according to the command input signal to a selected value within an operating range. In some examples, the operating range may include a portion or all of 0 to 100% of rated load. Various embodiments may be adapted to supply unipolar or bipolar load excitation. In some embodiments, high power factor may be maintained over a substantial range of commanded power to the load. Certain embodiments may enhance supply efficiency by capturing and recycling inductive load energy.

Abstract: A circuit arrangement includes a rectifier circuit having a first and a second load terminal, a first semiconductor device having a load path and a control terminal and a plurality of n, with n>1, second semiconductor devices, each having a load path between a first load terminal and a second load terminal and a control terminal. The second semiconductor devices have their load paths connected in series and connected in series to the load path of the first semiconductor device. The series circuit with the first semiconductor device and the second semiconductor devices are connected between the load terminals of the rectifier circuit. Each of the second semiconductor devices has its control terminal connected to the load terminal of one of the other second semiconductor devices. One of the second semiconductor devices has its control terminal connected to one of the load terminals of the first semiconductor device.

Abstract: The present invention is related to an energy recycling device. The energy recycling device includes a substrate, multiple miniature receivers, for receiving infrared radiation, on the substrate and multiple current rectifiers electrically connected to the miniature receivers respectively. The miniature receivers transform the infrared radiation into alternating currents (AC). The current rectifiers rectify the alternating currents (AC) so as to transform the alternating currents (AC) into direct currents (DC). Thereby, the infrared radiation received by the miniature receivers can be first transformed into the alternating currents (AC) with extremely high frequencies, and then the alternating currents (AC) with extremely high frequencies can be transformed into direct currents (DC) usable by an electronic device. Accordingly, infrared can be used to supply power.

Abstract: In a switching power supply apparatus, an alternating-current input power supply is input to the input terminals of a power factor correction converter and a DC-DC converter is connected to output terminals. A load is connected to the output of the DC-DC converter. A digital signal processing circuit takes the product of an output voltage error and a detection value of the input voltage as a current reference amplitude value and controls the on period of a switching element in accordance with the difference between the current reference amplitude value and the current flowing through an inductor. The target value of the output voltage or the output voltage error is corrected using a value that is proportional to the current reference amplitude value such that the output voltage rises as the load goes from a light to a heavy load state.

Abstract: A DC power supply apparatus comprising: a rectifying circuit including, a first rectifying portion, a second rectifying portion, a third rectifying portion and a fourth rectifying portion; a current detection portion; a first switching portion; and a second switching portion; wherein each of the first rectifying portion cooperatively operating with the first switching portion and the second rectifying portion cooperatively operating with the second switching portion is a semiconductor element which is formed by using a Schottky junction formed between silicon carbide or gallium nitride and metal and has a withstanding voltage property with respect to a voltage of an AC power supply.

Abstract: An RMS responding voltage converter for LED lights is disclosed.

Abstract: A three-phase reactor power saving device, comprising: a first capacitor set, connected electrically to a three-phase AC power supply, to store electric energy; a reactor set, connected electrically to said first capacitor set, to convert said electric energy into AC self-induced energy; a three-phase transformer, connected electrically to said reactor set, to boost said AC self-induced energy into boosted AC self-induced energy; a second capacitor set, connected electrically to said three-phase transformer, to store said boosted AC self-induced energy; a rectifier circuit, connected electrically to said three-phase transformer, to rectify current of said boosted AC self-induced energy into a DC current; a power regulating capacitor, connected electrically to said rectifier circuit; and a first DC reactor and a second DC reactor, connected electrically to said rectifier circuit, to output first DC self-induced energy and second DC self-induced energy to said load, to raise power saving efficiency.

Abstract: A three phase rectifier rectifies received three phase a.c. power to generate a ripple d.e. voltage. A power distribution bus conveys distribution power comprising the ripple d.c. voltage or an a.c. voltage derived therefrom to a location of an LED based lamp that is distal from the three phase rectifier. Additional circuitry disposed with the LED based lamp drives the LED based lamp using the distribution power.

Abstract: Parallel stage power output rectifiers for radio-frequency identification (RFID) devices and related components and methods are disclosed. An RFID tag receives a radio-frequency (RF) signal comprising RF input energy through an input such as an antenna. The RF input energy provided to a rectifier splits the RF input energy into two or more stages having parallel electrical outputs. The parallel electrical outputs allow for a more efficient use of the input energy in terms of current draw and improves voltage droop, thus improving the range and operation of the RFID tag.

Abstract: A power converting apparatus is configured with single-phase sub-converters (4) connected to AC input lines of individual phases of a three-phase main converter (3) in series therewith. In a control device (12) for performing output control of the power converting apparatus, a current command value calculating circuit (20) which adjusts a DC voltage command given to the main converter (3) so that DC voltages of the sub-converters (4) follow a command and generates AC current commands so that a DC voltage of the main converter (3) follows the DC voltage command is configured with a CPU, and AC currents are controlled by switching output voltage levels of the sub-converters (4) at an AC side thereof so that deviations of instantaneous AC current values from the AC current commands become smaller.

Abstract: A power supply circuit includes a pulse width modulation (PWM) chip, a number of phase circuits, a voltage output end, and a spike suppression circuit. The spike suppression circuit is connected to each of the phase circuits and the voltage output end. The PWM chip controls all of the phase circuits to alternately output power supply voltages according to a predetermined sequence. The spike suppression circuit receives the power supply voltages, and filters out voltage spikes in the power supply voltages, thereby outputting steady voltages to the voltage output end.

Abstract: A power regeneration apparatus includes a power conversion unit, an AC reactor, a voltage detecting unit, a phase detecting unit, a drive control unit for controlling the power conversion unit based on a phase detection value, and a reactive current component detecting unit. The phase detecting unit detects the phase of the AC power supply. The reactive current component detecting unit detects a reactive current component of a current. The drive control unit includes a phase correction section. The phase correction section corrects the phase detection value based on the reactive current component.

Abstract: A single-phase voltage source AC/DC converter according to the present invention generates a second axis voltage command from difference between a DC voltage detection value at a DC terminal and a DC voltage command value and controls a DC voltage by increasing and decreasing active power with the second axis voltage command. For example, the voltage at the DC terminal is increased by decreasing active power when the DC voltage detection value at the DC terminal is lower than the DC voltage command, while the DC voltage detection value at the DC terminal is decreased by increasing the active power when the DC voltage detection value at the DC terminal is higher than the DC voltage command.

Abstract: A semiconductor device 101 in a bi-directional switch includes: a first electrode 109A, a second electrode 109B, a first gate electrode 112A, and a second gate electrode 112B. In a transition period: when the potential of the first electrode 109A is higher than the potential of the second electrode 109B, a voltage lower than the first threshold voltage is applied to the first gate electrode 112A and a voltage higher than the second threshold value voltage is applied to the second gate electrode 112B; and otherwise, a voltage higher than the first threshold value voltage is applied to the first gate electrode, and a voltage lower than the second threshold value voltage is applied to the second gate electrode.

Abstract: An isolated power converter that includes, in one embodiment, a first magnetic core having a primary winding and a secondary winding around the first magnetic core. The power converter includes a second magnetic core having a first leg, a second leg coupled to the first leg, and a third leg coupled to the first and second legs, wherein a part of the third leg is equidistant from the first leg and the second leg. The power converter also includes a first winding encircling the first leg, a first end of the first winding coupled to the secondary winding, a second winding encircling the second leg, a first end of the second winding coupled to the secondary winding, and a third winding encircling the third leg, a first end of the third winding coupled to a second end of the first winding and to a second end of the second winding.

Abstract: Systems and methods of operating a voltage converter are provided. The converter includes an output inductor and an output capacitor coupled to a rectifier circuit. The converter also includes a clamp circuit having a clamping diode and a clamping capacitor coupled in series, with the serial combination in parallel with the output inductor. The clamp circuit can also include a recovery inductor coupled to the output capacitor, and a switch configured to selectively couple and decouple the recovery inductor in parallel with the clamping capacitor.

Abstract: An AC-DC converter is provided which suppresses a harmonic current and improves power factor at low cost. Such an AC-DC converter includes a rectifier connected to an AC power supply via a reactor, capacitors connected in series across the output terminals of the rectifier, a first bidirectional switch having one end connected to one input terminal of the rectifier and the other end connected to a connecting point of capacitors, a second bidirectional switch having one end connected to the other input terminal of the rectifier and the other end connected to the other end of the first bidirectional switch, and a control circuit for actuating the first and second bidirectional switches during a half cycle of the AC power supply so as to control a voltage inputted to the rectifier to a desired output voltage.

Abstract: A power rectification system includes power electronics configured to rectify an alternating current (AC) waveform to produce a direct current (DC) output voltage, a control circuit configured to control the power electronics based upon an error value, and a voltage reference control portion configured to provide the error value based upon a variable voltage reference and the DC output voltage. The variable voltage reference varies between the DC output voltage and a fixed voltage reference.

Abstract: This document discusses, among other things, an improved bridgeless power factor correction (PFC) circuit. In an example, the PFC circuit can include a first switch and a control circuit, the control circuit configured to provide a switching cycle, to generate a carrier signal corresponding to the switching cycle, and to generate a control signal for the first switch during the switching cycle. In an example, the control circuit can receive a first signal indicative of current through the first switch and generate a duty cycle for the first switch using a comparison of the first signal and the carrier signal. In an example, the control circuit can initiate the carrier signal at the beginning of the switching cycle and provide a carrier signal duration corresponding to a fraction of a duration of the switching cycle of the PFC circuit (e.g., one-half, one-third, etc.).

Abstract: A signal processing circuit is provided that includes a CMOS bridge rectifier circuit having a first input terminal and a second input terminal for receiving a rectangular wave form that includes a data sequence. A first output terminal and a second output terminal provides a rectified dc output voltage. A first data output terminal is connected to one of the first and the second input terminals, and a second data output terminal is connected to one of the first and the second output terminals, wherein the data output terminals provide an output signal representative of the data sequence. A substantially resistive load may be operatively coupled between the first and second voltage output terminals, the resistive load without a discrete parallel capacitor.

Abstract: In a battery charger, the rectifier includes rectifying elements provided for respective three phases. The rectifier supplies, for the respective phases, currents for rectifying three-phase AC voltages so as to charge a battery. A voltage detector detects whether or not the battery is charged. Switching units are provided for the respective rectifying elements, and rectify the AC voltages to charge the battery in the off-state. Switch controllers output gate signals in accordance with a timing of zero-cross detection upon receiving a detection signal indicating that all the gate signals for turning on and off the respective switching units for the respective phases are supplied in the order of the phases.

Abstract: Power from an AC source at a source voltage is converted for delivery to a load at a DC load voltage, where the source voltage may vary between a high line voltage and a low line voltage in a normal operating range. DC-DC voltage transformation and isolation are provided in a first power conversion stage, the first stage having a CA input for receiving power from the source and a CA output for delivering a galvanically isolated unregulated AC adapter module (UAAM) voltage. First stage circuitry for performing the first power conversion stage is provided in a self-contained adapter module having input terminals for connection to the AC source and an output connected to the CA output for providing power to a second power conversion stage wherein the second power conversion stage is external to the adapter module.

Abstract: A method and apparatus for controlling the feed rate of a rectified AC pulses via a gated rectifier in a low DC voltage and current power supply is disclosed. The gated rectifier outputs gated AC pulses to an input capacitor via a current control diode and/or a zener diode and/or a resistor for charging the input capacitor to a voltage level and a charge capacity commensurate with the low voltage regulator and the low DC current drain. A gate capacitor for accumulating incremental charges of rectified AC pulses fed via a divider network is pre-configured to trigger the gated rectifier, timed by discharging the aggregated charge of a predetermined number of charges to the gate. The input capacitor charged by the gated AC pulses at a rate of one per said determined number to the input capacitor feeds the voltage regulator for powering a low DC current consuming device.

Abstract: A semiconductor arrangement includes a circuit carrier, bonding wire and at least N half bridge circuits. The circuit carrier includes a first metallization layer, a second metallization layer, an intermediate metallization layer arranged between the first metallization layer and the second metallization layer, a first insulation layer arranged between the intermediate metallization layer and the second metallization layer, and a second insulation layer arranged between the first metallization layer and the intermediate metallization layer. Each half bridge circuit includes a controllable first semiconductor switch and a controllable second semiconductor switch. The first semiconductor switch and the second semiconductor switch of each half bridge circuit are arranged on that side of the first metallization layer of the circuit carrier facing away from the second insulation layer. The bonding wire is directly bonded to the intermediate metallization layer of the circuit carrier at a first bonding location.

Abstract: A brushless fan motor control circuit assembly consists of a high-frequency filter circuit, a rectifier circuit, a power factor enhancing circuit, a current-limit and voltage regulation circuit and a brushless fan motor driving circuit. By means of the high-frequency filter circuit to suppress high frequency noises, the power factor enhancing circuit to enhance the power factor and to save power consumption, the current-limit and voltage regulation circuit to limit the current and to achieve overload protection, the brushless fan motor control circuit assembly controls the operation of a motor of an electric accurately and safely, avoiding fan vibration.

Abstract: A power factor correction converter and a control method thereof are provided includes an interleaving control tube set, an interface to an alternating current power supply, a first inductor, a second inductor, a third inductor, a capacitor, a first bridge arm and a second bridge arm. Abridge arm includes a first switch tube and a second switch tube connected in series; The first bridge arm, the second bridge arm, and the capacitor are connected to each other in parallel; the alternating current power supply and the first inductor are connected in series, and the second inductor and the third inductor are connected in parallel, and then connected to the first inductor in series; the second inductor is connected to the first bridge arm, and the second inductor is connected to the second bridge arm; and the alternating current power supply and the first inductor are connected in series.

Abstract: A power factor correction converter includes a diode bridge that rectifies an alternating-current voltage input from an alternating-current input power supply Vac, a series circuit including an inductor and a switching element, a rectifying smoothing circuit connected in parallel with the switching element and including a diode and a smoothing capacitor, and a digital signal processing circuit that controls turning on and off of the switching element such that the input current input from the alternating-current input power supply Vac comes to have a similar shape to the alternating-current voltage. The current flowing through the inductor in the off period of the switching element is detected by using a current detection resistor, the operation mode is determined on the basis of the inductor current IL at a predetermined timing and the switching element is optimally controlled in accordance with the operation mode.

Abstract: Apparatus and method for generating a rectified output signal in a RFID tag from first and second alternating signals. A dual-terminal rectifier device has first and second input terminals to which the first and second alternating signals are applied, and further has a gate configured to form a conductive channel to electrically couple the first and second input terminals to the output terminal in response to a gate voltage. The dual-terminal rectifier device is configured to rectify a combination of the alternating input signals applied to the input terminals of the semiconductor device to generate a rectified output signal at an output terminal.

Abstract: Rectifier circuits which are usable, instead of diodes, for rectifying alternating voltages, and which, like diodes, form two-terminal networks having a cathode terminal and an anode terminal. The power loss of these rectifier circuits is clearly less that the power loss of silicon p-n diodes. These rectifier circuits also include voltage clamping functions.

Abstract: A method of and system for monitoring condition of a large capacitor connected across an output of a rectifier circuit in an operating electrical power transmission circuit in order to anticipate capacitor failure and facilitate appropriate corrective action is disclosed. The method includes measuring a ripple voltage on the capacitor and ripple current through the capacitor, determining from a representative signal whether the signal exceeds a predetermined threshold; and sending an output to a controller on a system operator if the signal exceeds the predetermined threshold. The ripple current and ripple voltage measurements may be provided as inputs to a digital to analog converter which produces and sends the representative signal to a microprocessor to generate the output to the controller.

Abstract: The present invention is a control architecture for an active rectifier. The control architecture monitors the AC input voltage provided to the active rectifier at a sampling rate grater than the frequency of the AC input voltage and calculates, in response, a phase estimate associated with the monitored AC input voltage that is updated with each new sample of the AC input voltage. Based on the phase and frequency estimates, along with monitoring of the AC input current and DC output voltage, the control architecture calculates voltage commands that are used to generate the pulse-width modulation (PWM) controls signals for provision to solid-state switching devices in the active rectifier.