According to some embodiments, an electronic drive circuit is disclosed. The electronic drive circuit includes an energy storage device and a first bridge circuit coupled to the energy storage device. The first bridge circuit includes at least one leg having two switches. The electronic drive circuit also includes a transformer. The transformer includes a first winding coupled to the first bridge circuit and a second winding coupled to the energy storage device through a center tap. The electronic drive circuit further includes a second bridge circuit coupled to the second winding of the transformer. The second bridge circuit includes a pair of switches operable to conduct in both directions and block voltage in both directions. The electronic drive circuit additionally includes a DC bus coupled to the second bridge circuit and a controller, which is configured to buck or boost a DC voltage from the energy storage device to supply to the DC bus as well as buck or boost a DC voltage from the DC bus to supply to the energy storage device.

A method and apparatus include a primary transformer coil, a secondary transformer coil, and a center tapped inductor coupled to the secondary transformer coil. A first switch may be in electrical communication with the center tapped inductor and may be configured to affect the first output voltage. A second switch may be in electrical communication with the center tapped inductor and may be configured to affect the second output voltage. In a particular example with an analog current (AC) output voltage, the two output voltages are out of phase to each other. In a direct current (DC) implementation, the transformer may be operated to output a positive and a negative output voltage. The apparatus may function as a resonant converter, or may operate in non-resonant mode. In one implementation, an H bridge may provide reactive power support. An inductor filter may be in electrical communication with the secondary transformer coil. Where desired, a diode bridge may be in electrical communication with the primary transformer coil.

A resonant core power supply includes a core with excitation, resonant, and load windings where the resonant winding is coupled to a tank circuit and a controller manipulates the phase, amplitude and waveform of an excitation signal applied to the excitation winding.

A converter of an input voltage into at least one output voltage, including a pair of first and second piezoelectric assemblies; a first bridge including two first switching branches each having at least one first switch; a second bridge including two second switching branches each having at least one second switch; each piezoelectric assembly including a first end connected to the first bridge and a second end connected to the second bridge; each first switch being connected between a terminal of the input voltage and a first end; each second switch being connected between a terminal of the output voltage and a second end. It includes at least one complementary switch connected directly between the ends of a pair of piezoelectric assemblies, connected to a same bridge,

Disclosed are a power supply control circuit and a display device. An output terminal of the power factor correction circuit is connected to the resonance circuit; a first output terminal of the resonance circuit is connected to the backlight module through the first rectification filter circuit, and a second output terminal of the resonance circuit is connected to the control circuit board and the communication circuit through the second rectification filter circuit; a third output terminal of the resonance circuit is connected to the control system and the communication circuit; the control circuit board is connected to the control system through the communication circuit; a first signal output terminal of the control system is connected to the power factor correction circuit; and a second signal output terminal of the control system is connected to the resonance circuit.

The present DC power supply and distribution system comprises: a plurality of power distribution lines each connected to a respective one of a plurality of loads; a first converter to receive an AC voltage from a commercial AC power source, convert the received AC voltage into a plurality of DC voltages and supply each of the plurality of DC voltages to a respective one of the plurality of power distribution lines; a second converter to receive a DC power from a power generating and/or storing source, convert the received DC power into a plurality of DC powers, and supply each of the plurality of DC powers to a respective one of the plurality of power distribution lines; and a controller to enhance the second converter in efficiency by controlling the first converter so that a ratio of the plurality of DC voltages is a predetermined first ratio.

A direct current to direct current (DC-DC) converter can include a chip embedded integrated circuit (IC), one or more switches, and an inductor. The IC can be embedded in a PCB. The IC can include driver, switches, and PWM controller. The IC and/or switches can include eGaN. The inductor can be stacked above the IC and/or switches, reducing an overall footprint. One or more capacitors can also be stacked above the IC and/or switches. Vias can couple the inductor and/or capacitors to the IC (e.g., to the switches). The DC-DC converter can offer better transient performance, have lower ripples, or use fewer capacitors. Parasitic effects that prevent efficient, higher switching speeds are reduced. The inductor size and overall footprint can be reduced. Multiple inductor arrangements can improve performance. Various feedback systems can be used, such as a ripple generator in a constant on or off time modulation circuit.

A switching mode power supply with improved power balance is discussed. It has a transformer, a primary circuit having a primary power switch coupled to a primary side of the transformer, and a plurality of secondary circuits coupled in parallel with each other at a secondary side of the transformer. A plurality of output voltages are provided at each of the secondary circuits; and each of the secondary circuits has a secondary power switch. If any of the output voltage deviates from a reference voltage, an ON time length of the corresponding secondary power switch is extended.

A power system for a vehicle includes a traction battery having an output voltage, a transformer including a coil, and a power converter including a plurality of capacitors and a plurality of switches arranged such that when a first subset of the switches are ON, two of the capacitors are in parallel, an AC voltage across the coil is in a positive half cycle, and a voltage across each of the two of the capacitors is half the output voltage.

A control method is provided for operating a power converter with a power switch and an inductive device. A current-sense signal is provided to represent an inductor current through the inductive device. An ON time of the power switch is determined in response to a feedback signal and a saw-wave signal, to operate the power converter in a non-power-saving mode. The feedback signal is generated according to an output voltage of the power converter. The power converter can be operated in a power-saving mode, a burst mode. Operating in the burst mode, the ON time is determined in response to the current-sense signal and a current-limiting signal, which is increased during a soft burst-in time and is decreased during a soft burst-out time.