Abstract: An apparatus for controlling a switching DC-DC converter with a first half-bridge circuit including a first switch and a second switch, with a second half-bridge circuit including a third switch and a fourth switch and with an inductance connected between the center taps of the first and the second half-bridge circuit includes, according to embodiments, a control unit that is configured to adapt, in dependence on an input voltage and an output voltage at the switching DC-DC converter, a switching frequency of the switches of the DC-DC converter, the duty cycles of the first and fourth switch and the time delay between switching on the first and the fourth switch. The control unit is configured to determine the switching frequency, the first duty cycle, the second duty cycle and the time delay based on an output current of the switching DC-DC converter.

Abstract: A power device includes a semiconductor relay and a pre-charger that has a reference voltage generator and a controller. The semiconductor relay is disposed at a position between a battery supplying electric power to a power converter that serves as a load and a smoothing capacitor connected on a battery side of the power converter in parallel with the power converter. The reference voltage generator generates a reference voltage having a gradually-increasing voltage value in a pre-charge period, prior to a turning ON of the semiconductor relay accompanying a turning ON of an ignition switch. The controller controls the semiconductor relay such that a charge voltage which is an inter-terminal voltage of the smoothing capacitor is set to a preset value according to the reference voltage.

Abstract: A device and method for controlling a power supply. The method includes: monitoring a feedback signal of a feedback terminal; determining whether the feedback signal of the feedback terminal is not a pulse signal; and terminating an on/off operation of a switching element when the feedback signal of the feedback terminal is not a pulse signal. Therefore, an abnormal status of the device can be correctly detected with a simple structure when the feedback terminal is open or is shorted with other terminals, while an error operation and a damage of the device can be avoided.

Abstract: A DC-DC switching converter soft start method is provided, using a scaled switch size. An increased switch resistance, higher than the normal operating switch resistance, is achieved during the startup of the switching converter. The on-resistance of the high side switch, together with a minimum duty cycle, reduces the peak inductor current of the switching converter. After a startup period, the switching converter reverts back to a normal switch resistance.

Abstract: Systems and methods for providing self-driven active AC rectification are provided. In particular, a power conversion system for providing self-driven active AC rectification can be provided. The system can include an input for receiving AC power, a first capacitor and a second capacitor electrically connected in series. The first and second capacitors can also be electrically connected in parallel with a rectifier's load. The system can include a low-side switching element and a shunt resistor electrically connected between the rectifier's load and a system ground. The power conversion system can also include a low-side feedback control loop configured to obtain a low-side feedback signal based on a voltage across the shunt resistor and the low-side feedback control loop can be further configured to control the low-side switching element based, at least in part, on the low-side feedback signal.

Abstract: A power circuit for regulating power transfer includes: a power converter circuit having an input and an output and arranged to be connected between a power supply and a load to regulate power transfer therebetween; an input capacitor connected across the input of the power converter circuit; a series pass element arranged to be connected between the power supply and the input capacitor; and a control circuit, operably connected with the series pass element and the power converter circuit, for controlling operation of the series pass element. The power circuit further includes an input capacitor power control circuit operably connected with the input capacitor and arranged to provide power to the input capacitor to facilitate charging of the input capacitor when a voltage across the series pass element is detected to be above a voltage threshold as a result of an increase in a voltage of the power supply.

Abstract: Systems and methods are provided for power conversion system regulation. A system controller includes: a first signal processing component configured to receive a first signal associated with an auxiliary winding of a power conversion system and generate a second signal based at least in part on the first signal, the power conversion system further including a primary winding and a secondary winding; and a drive component configured to receive the second signal and output a drive signal to open or close a switch to affect a current flowing through the primary winding. The first signal processing component is further configured to: detect a plurality of valleys of the first signal, the plurality of valleys corresponding to a same demagnetization process of the power conversion system; select a valley from the plurality of valleys; and change the second signal at the selected valley.

Abstract: An inverter assembly for a power system is provided. The inverter assembly includes a plurality of stackable housing members and a plurality of inverter units received within the plurality of stackable housing members. Each of the plurality of inverter units includes a filter capacitor having a plurality of auxiliary connectors extending outwardly. The inverter assembly also includes a bus bar configured to be connected to the plurality of auxiliary connectors of the filter capacitor of each of the plurality of inverter units to establish electrical connection among the plurality of inverter units.

Abstract: A system and method includes parallel power converters, at least one current sensor, and a first feedback control circuit. A first power converter is configured to convert a first input power to a first output power, and is controlled using pulse width modulation having a first switching period. One or more second power converters are connected in parallel with the first power converter and configured to convert a second input power to a second output power. The first output power and the second output power are provided to a load. The at least one current sensor is positioned to sense first output current of the first output power, and the first feedback control circuit is configured to calculate a first metric based on the first sensed current at each of a plurality of first edges of each half switching period of the first switching period, and at intermediate points between each of the plurality of first edges.

Abstract: A converter circuit is disclosed. The converter circuit includes a transformer and a primary circuit connected to the primary side of the transformer, where the primary circuit includes a first switch connected to a ground. The converter circuit also includes a second switch connected to the first switch, and a clamping capacitor connected to the second switch and to the input. The converter circuit also includes a secondary circuit connected to the secondary side of the transformer, where the secondary circuit includes a rectifying element, and an output capacitor connected to the rectifying element. In addition, the output capacitor has a substantial effect on resonance of the converter circuit.

Abstract: The present invention relates to a power conversion device, comprising: at least one resonant circuit comprising at least one resonant inductor and at least one resonant capacitor; a first transformer comprising a first primary winding which is electrically connected to the resonant circuit and at least one first secondary winding; and a second transformer comprising a second primary winding which is electrically connected to the resonant circuit and at least one second secondary winding, the second primary winding and the first primary winding are connected in parallel and have the same number of coil turns, and the second secondary winding and the first secondary winding have the same number of coil turns; an deviation of inductance between the first primary winding and the second primary winding meets |Lm1?Lm2|/(Lm1+Lm2)<=30%, Lm1 is the inductance of the first primary winding, and Lm2 is the inductance of the second primary winding.

Abstract: A method and apparatus for limiting or preventing electromagnetic interferences in a switching converter are presented. In particular, a power circuit provided with an active electromagnetic interference filter is presented. There is an electromagnetic interference EMI reduction circuit for use with a switching converter. This EMI reduction circuit has a current source and is adapted to regulate a voltage across the current source to provide a current having a constant average value. The switching converter is adapted to provide a converter current, and the current source constant average value may be substantially equal to an average value of the converter current. The circuit has a variable resistance; and an adjuster adapted to adjust the variable resistance based on the converter current. The adjuster may have a comparator, which is adapted to compare a voltage value at a terminal of a transistor switch, and a reference value.

Abstract: A transformation system capable of efficiently transforming electrical power from one dc voltage to one or more other dc voltages or of regulating power flow within a network of constant nominal voltage; in each case without intermediate magnetic transformation. The transformation system is based on periodic and resonant delivery of charge from the first of two dc nodes to a system of capacitors, electrical reconfiguration of those capacitors, then delivery of power to one or more other dc nodes.

Abstract: A Power Factor Correction (PFC) controller includes an error amplifier for amplifying a difference between Vout and intended Vout to provide a power demand (Pdem) output at a compensation pin. A burst mode controller includes soft-start circuitry coupled to receive Pdem and to a drive pin which provides pulses to a control node of a power switch of a DC-DC converter during burst periods. The pulses slow ramping of line current over a first 2 to 36 switching cycles at a beginning of bursts when energizing the inductor to reduce a line current slope as compared to without ramping up, and for slowing ramping down of line current over the last 2 to 36 switching cycles to reduce a line current slope when de-energizing the inductor as compared to a line current without ramping down. The PFC controller does not utilize zero-crossings of the line voltage for burst period synchronization.

Abstract: A current transformer and a direct current source based on a current transformer are disclosed. In an embodiment, the current transformer includes two output ends; a first winding and a second winding connected in series between the two output ends; a main core; a bypass core, arranged to be magnetically coupled with the main core. The first winding is wound on a part of the main core and a part of the bypass core, and the second winding is wound on apart of the bypass core. In an embodiment, the current transformer also includes a high-frequency bypass, connected in parallel with the first winding, and used to filter a high-frequency signal. The high-frequency bypass provides a low-impedance path for a high-frequency signal in a primary conductor under measurement, such that the bypass core with the second winding presents less obstruction to the main core, thereby reducing heating.

Abstract: A switching power supply device includes a first converter of boost type to which a full-wave rectified AC power supply is input, and a second converter of current resonant type to which an output of the first converter is supplied as an input voltage. The second converter has a normal mode for performing power supply control by continuously outputting an output of an oscillator to a switching element of the second converter and a standby mode for performing power supply control by intermittently outputting the output of the oscillator thereto under light load by comparing a feedback voltage from a secondary side of an isolation transformer with a threshold voltage. The second converter corrects the threshold voltage according to an output voltage of the first converter.

Abstract: A wireless power receiver IC in which the power path can be reconfigured as either a low-dropout regulator (LDO), a switched-mode power supply (SMPS) or a power switch (PSW) is provided. All three modes share the same pass device to reduce die area and share the same output terminal to reduce pin. In an inductive wireless receiver, the power path can be reprogrammed on the fly to LDO or PSW mode or can be reprogrammed on the fly to SMPS or PSW mode. In a resonant or multi-mode wireless receiver, the power path can be reprogrammed on the fly to SMPS or PSW mode. Furthermore, to achieve high power transfer efficiency performance, using N-channel MOSFET as its pass device has better efficiency and smaller die area than P-channel MOSFET pass device.

Abstract: A physical topology for receiving top and bottom power electronic switches comprises a top collector trace connected to a positive voltage power supply tab and having a connection area for a collector of a top power electronic switch, a bottom emitter trace connected to a negative voltage power supply tab and having a connection area for an emitter of the bottom power electronic switch, and a middle trace connected to a load tab and having a connection area for an emitter of the top power electronic switch and a connection area for a collector of the bottom power electronic switch. Sampling points are provided on the traces for voltages on the emitters of the top and bottom power electronic switches, on the trace for voltage of the collector of the bottom power electronic switch, and on the negative voltage power supply tab. The topology defines parasitic inductances.

Abstract: A voltage dropping apparatus may include: a voltage dropping unit receiving an input voltage, outputting the input voltage in a first mode, and dropping a level of the input voltage in a second mode; a voltage output unit connected to the voltage dropping unit, receiving and outputting the input voltage in the first mode, and receiving and outputting the dropped voltage in the second mode; and a control unit receiving a mode signal and controlling a mode change of the voltage dropping unit and the voltage output unit based on a value of the mode signal.

Abstract: A magnetic component comprising: a magnetic core comprising an upper magnetic core portion, a lower magnetic core portion, and four core columns; a first winding wound around any two core columns which form a first closed magnetic circuit with the upper and lower magnetic core portions therebetween; and a second winding wound around remaining two core columns which form a second closed magnetic circuit with the upper and lower magnetic core portions therebetween. A sum of an AC flux peak-peak value within single core column of the first closed magnetic circuit, and an AC flux peak-peak value within single core column of the second closed magnetic circuit is larger than not only an AC flux peak-peak value within the upper magnetic core portion, but also an AC flux peak-peak value within the lower magnetic core portion. The first winding and the second winding are not connected in series directly.