Aspects of an efficient, wide voltage range, power converter system are described. In one example, a power converter system includes a first power converter, a second power converter, and a controller for the power converter. An input of the first power converter and an input of the second power converter are connected in series across an input voltage for the power converter system, and an output of the first power converter and an output of the second power converter are connected in parallel at an output of the power converter system. The controller is configured to regulate the second power converter and to determine whether or not to regulate the first power converter based on the input voltage for the power converter system and an output voltage of the power converter system, among other factors, for greater efficiency of the power converter system over wider input and output voltage ranges.

A multi-stage driver system includes a switched mode power circuit for providing power to different electrical load(s). Multi-stage driver system includes a control block including at least one microcontroller coupled to control operations of the switched mode power circuit. Switched mode power circuit includes a high voltage region, a low voltage region, and an isolation barrier. High voltage region of the switched mode power circuit includes a switched rectifier and a switched bridge circuit configured to produce a high voltage bidirectional pulse train signal for output to an isolation barrier. Low voltage region of the switched mode power circuit includes a rectification circuit coupled to the isolation barrier and at least one switched converter circuit coupled to the rectification circuit. Control block receives real-time input signals (e.g., analog voltage reading(s)) from the high and low voltage regions and responsively produces control signals to the high and low voltage regions.

A direct electrical power converter, DPX, that connects a primary port including a DC or AC energy source, with a secondary port including a DC or AC load, comprising a transformer or autotransformer; a first power switch between two nodes, having two power terminals and a first control terminal; and a second power switch between other different two nodes having two power terminals, and a second control terminal wherein said switches are configured to connect the primary port energy source to the secondary port load, through the transformer or autotransformer. The cited first and second power switches are configured to be operated simultaneously under the action of a logic control signal providing a conducting status with all the power switches being simultaneously in an On state or with all the power switches simultaneously in an Off state, connecting or disconnecting said transformer to said primary port and said secondary ports simultaneously.

Disclosed is an asymmetric half-bridge flyback converter and a control method, comprising: in an initial switching cycle of the asymmetric half-bridge flyback converter, obtaining a pre-turnoff time of the second switch transistor, and controlling the second switch transistor to be turned off after a delay which lasts for a first time and starts at the pre-turnoff time of the second switch transistor; in a non-initial switching cycle of the asymmetric half-bridge flyback converter, obtaining a judgment result by judging whether the first switch transistor is operated with zero-voltage switching in a current switching cycle, and adjusting a length of the first time based on the judgment result. The present disclosure can realize zero-voltage switching of the asymmetric half-bridge flyback converter, and at the same time, satisfy a requirement for achieving more ideal dead-time setting under a wider range of input voltage and a wider range of output voltage.

An LLC resonance converter includes a switching circuit, a resonance tank, a transformer, a synchronous rectification unit, and a control unit. The switching circuit includes a first switch controlled by a first control signal and a second switch controlled by a second control signal. The synchronous rectification unit includes a first synchronous rectification switch controlled by a first rectification control signal and a second synchronous rectification switch controlled by a second rectification control signal. The first control signal, the first rectification control signal, the second control signal, and the second rectification control signal include an operation frequency and a phase shift amount. When the operating frequency is lower to a specific value or the phase shift amount is higher to a specific value, the control unit fixes one of them to extend a hold-up time of the LLC resonance converter.

An inductive power outlet is disclosed. The inductive power outlet has a primary inductor, for wirelessly powering an inductive power receiver. The inductive power outlet has a secondary inductor. The primary inductor and the secondary inductor form a resonant frequency. The inductive power outlet comprises a driver generating an oscillating voltage to the primary coil at a frequency higher than the resonant frequency. The inductive power outlet comprises a signal detector. The signal detector comprises a peak detector configured to detect voltage peaks across the primary inductor or current peaks of a current supplied to the primary inductor. The signal detector comprises a processor configured to determine a frequency of either the voltage peaks or the current peaks.

Some embodiments may include a nanosecond pulser comprising a plurality of solid state switches; a transformer having a stray inductance, L.sub.s, a stray capacitance, C.sub.s, and a turn ratio n; and a resistor with a resistance, R, in series between the transformer and the switches. In some embodiments, the resonant circuit produces a Q factor according to $Q=\frac{1}{R}\sqrt{\frac{L_s}{C_s}};$
and the nanosecond pulser produces an output voltage V.sub.out from an input voltage V.sub.in, according to V.sub.out=QnV.sub.in.

A switching power supply unit includes a pair of input terminals, a pair of output terminals, a transformer, an inverter circuit, a rectifying and smoothing circuit, and a driver. The inverter circuit includes first to fourth switching devices, a first capacitor, a resonant inductor, and a resonant capacitor. The rectifying and smoothing circuit includes a rectifying circuit including rectifying devices, and a smoothing circuit. The first to fourth switching devices are coupled in series in this order between two input terminals constituting the pair of input terminals. The first capacitor is disposed between a connection point between the first and second switching devices and a connection point between the third and fourth switching devices. The resonant inductor, the resonant capacitor, and a primary winding are coupled in series in no particular order between a connection point between the second and third switching devices and one of the two input terminals.

[Problem] To provide a single-direction insulative DC-DC power converter using a single-direction switch circuit capable of realizing soft switching even with a simple circuit configuration and a method for controlling the DC-DC power converter. [Solution] A power converter comprising a primary circuit and a secondary circuit connected via a high-frequency transformer, wherein a circuit having a switching element is provided to the primary circuit, the secondary circuit has, connected in parallel, a DC capacitor and a diode rectifying circuit including four diodes U+, U−, V+, and V− each having a resonance capacitor C.sub.r connected in parallel, and a resonance circuit formed by the resonance capacitor C.sub.r and a leakage inductance L of a the high-frequency transformer is formed in the secondary circuit.

A resonant inductive power transfer circuit has a power converter to supply to a load, and the converter is concurrently controlled to create a controlled reactance that substantially compensates for variability in the coupling with the another resonant inductive power transfer circuit and/or changes in the load supplied by the power converter.