A method comprises providing a resonant converter comprising a switching network comprising a plurality of switches, a resonant tank coupled between the switching network and a transformer, wherein the resonant tank comprises a series resonant inductor coupled to a switching network and the transformer and a series resonant capacitor coupled to the switching network and the transformer and a driver having an adjustable bias voltage and in response to a startup process of the resonant converter, configuring the switching network to operate a switching frequency higher than a resonant frequency of the resonant tank.

Startup Method and System for Resonant Converters

There is disclosed an electronic half-bridge converter. The electronic converter (12) comprises an input (110, GND 1 ) comprising two terminals for receiving a first power signal ( V in ), and an output (106, GND 2 ) comprising two terminals for providing a second power signal ( V o , i o ). On the primary side, the converter comprises a half-bridge (S 1 , S 2 ), a transformer (T) and a first capacitor (C RP ). Specifically, the first capacitor (C RP ) and the primary winding (T1) of the transformer are connected in series between the intermediate point of the half-bridge and an input terminal (110, GND 1 ). On the secondary side, the converter comprises a diode (D), a second capacitor (C RS ) and an inductor (L o ). Specifically, the second capacitor (C RS ) and the secondary winding (T2) of the transformer (T) are connected in series between the cathode and the anode of the diode (D), and the inductor (L o ) and the output (106, GND 2 ) are connected in series between the cathode and the anode of said diode (D). Specifically, the electronic converter comprises a third capacitor (C RS2 ) and at least one electronic switch (S 1 ) adapted to selectively connect the third capacitor (C RS2 ) in parallel with the second capacitor (C RS ).

Electronic converter and related method of operating an electronic converter

An on-board charger for charging a battery of an eco-friendly vehicle and a method for charging a battery using the on-board charger are provided. The on board charger reduces an output current ripple by improving a snubber circuit unit of the on-board charger for charging a battery in plug-in hybrid and electric vehicles. In addition, the on-board charger for charging a battery of an eco-friendly vehicle reduces a surge voltage generated in a rectifier diode and reduces an output current ripple by arranging two capacitors and three diodes in a transformer secondary rectifier of the on-board charger.

On-board charger for charging battery

First FET switches control supply of electricity from an external power supply to a primary winding of a transformer A condenser is connected, in series, to a secondary winding of the transformer A second FET switch is connected, in parallel, to the secondary winding and the condenser The diode is connected, in parallel, to the second FET switch A switch control unit acquires a value obtained by measuring a current flowing through the first FET switches and the second FET switch and controls, on the basis of the measurement result of the current, conduction of the first FET switches and the second FET switch

Power supply device and control method of power supply device

A resonant power converter is disclosed with a driving circuit generating a switching signal connecting power to a resonant tank circuit, with a voltage monitoring circuit measuring a voltage output and a load current. A micro-controller is operable with a control circuit for multiple step sampling with the switching signal at a switching frequency to settle the resonant circuit determined from the voltage output and load current. A fast load transient response at a high frequency with the resonant circuit provides the multiple step sampling to ensure enough time for micro-controller to calculate. Optimal trajectory control facilitates a burst mode of high frequency with the resonant circuit using adaptive multiple step sampling for an on-time to extend the burst operation range. A soft start-up process uses the micro-controller processing in multiple stages.

Multi-Step Simplified Optimal Trajectory Control (SOTC) Based on Only Vo and I Load

In a DC power supply including a transformer, for making a semiconductor switch operate with a high frequency, an auxiliary circuit that reduces switching loss and a countermeasure circuit for a surge voltage generated in a rectifier diode are provided. In a DC power supply in which a DC power source 101 and a transformer T are connected via a power conversion circuit and a secondary winding of the transformer T is connected to a load RL via a rectifier diode bridge and a filter circuit to supply power to the load RL, a resonance reactor Lz is provided on an output side of the transformer T, a resonant switch circuit 103 including a parallel circuit of a diode Dz and a semiconductor switch Qz and a resonant capacitor Cz is connected in parallel to the rectifier diode bridge and a snubber circuit including a snubber capacitor Cs, a snubber diode Ds1 and a diode Ds2 for discharge is connected to a serial resonant circuit including the resonance reactor Lz and the resonant capacitor Cz in the resonant switch circuit 103 to absorb a surge voltage.

DC power supply

A DC power supply including a resonant circuit on a secondary side of a transformer suppresses a surge voltage during power recovery of diodes constituting a rectifier circuit, correctly estimates a load current from a secondary current of the transformer, and adjusts supplied power when a load is light. The DC power supply includes a DC voltage source, a converter, a transformer, a rectifier circuit, a resonant circuit composed of a resonant switch and a resonant capacitor, a filter reactor, a filter capacitor, a snubber diode, a snubber capacitor, a load, first and second voltage sensors, a current sensor, and a controller for controlling gate pulses of semiconductor devices constituting a converter and the resonant switch and a signal for adjusting operation timings of A/D converters converting the signals of these sensors.

Tetsuo Kojima

Papers

DC power supply

DC power supply including resonant circuit for reducing switching losses