67results about How to "Achieve high frequency" patented technology

The invention discloses a non-complementary flyback active clamp converter. The non-complementary flyback active clamp converter comprises a transformer, a main switching tube, a clamp switching tube, a clamp capacitor and a drive module. The drive module outputs main drive signals to the drive end of the main switching tube, and the driving signals are used for controlling the main switching tube to be alternately switched on and switched off. The drive module outputs clamp drive signals to the drive end of the clamp switching tube. The clamp drive signals and the main drive signals have the same period. Each period comprises a first pulse signal which is generated when the switching-on state of the main switching tube is converted to the switching-off state, a second pulse signal which is generated when the main switching tube is in the switching-off state, and a signal which is generated at the remaining time and used for controlling the switching-on and the switching-off of the clamp switching tube, wherein the first pulse signal and the second pulse signal are independent of each other and both used for controlling the switching-on and the switching-off of the clamp switching tube. By the adoption of the non-complementary flyback active clamp converter, it is guaranteed that a high-frequency current generated when the clamp capacitor is charged fully flows through the clamp switching tube and avoids a backward diode of the clamp switching tube.

The present invention is one inverter includes one step-down modulating and filtering output circuit comprising one power source, two power switching transistors, filtering inductor, filtering capacitor and two freewheeling diodes; and one other step-down modulating and filtering output circuit comprising one other power source, two other power switching transistors, one other filtering inductor, the said filtering capacitor and two other freewheeling diodes. In the circuit, each power switching transistors has a voltage stress only one time that of the output voltage, and from the bridge arm, three-state voltage waveform may be output, so that low voltage HF power transistors may be used for high switching frequency, reduced volume and weight and fast dynamic response. The present invention proposes no-bias current half-period operation mode of the inverter with optimized operation efficiency and corresponding control method.