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 invention provides a DC power supply apparatus. In the case of applying an AC power supply voltage about 100V - 240V to a DC power supply apparatus connected with an industry power supply for the high-frequency switch, there is a problem that there is no high voltage resistance and high current resistance rectifying element which can track the high-speed switch action of an semiconductor switch element of a high-frequency switch. Further, when the switching frequency is increased in the constituent components of the related art, the loss of each of the semiconductor elements, that is, the rectifying elements and the semiconductor switch elements on a path for flowing the current from the DC power supply apparatus becomes large. Thus, there arise problems that the efficiency of the DC power supply apparatus reduces and the semiconductor elements can not withstand heat generated by the loss and are burnt. The rectifying element cooperatively operating with the switching action of the semiconductor switch element is a semiconductor element which is formed by using a Schottky junction formed between silicon carbide or gallium nitride and metal and has a withstanding voltage property with respect to a voltage of an AC power supply.

The invention relates to electric-power, electron and electric-energy circuits, aim to provide an isolated soft switching two-diode forward resonant DC / DC (direct-current / direct-current) circuit. The circuit comprises a power source, two switching diodes, two clamping diodes, a high-frequency isolation transformer, a primary winding, a secondary winding, an output rectifier diode and an output filter capacitor, and further comprises an input side inductor, a resonant inductor and a resonant capacitor. The resonant capacitor Cr is connected with the power source in parallel, and the input side inductor is located between the resonant capacitor and the power source. The resonant inductor is connected with the transformer primary winding in series. Load formed by the resonant inductor, the resonant capacitor and the output voltage forms resonant circuits in series. By the isolated soft switching two-diode forward resonant DC / DC circuit, a power switching diode operates while zero voltage switches on and quasi-zero current is in switched off state, voltage at two ends of the power switching diode is reduced, overlap time of current passing through the power switching diode is reduced, and switching consumption of the power switching diode is reduced; energy on parasitic inductors or capacitors can be recovered, and energy converting efficiency is improved; energy consumption on the circuit is reduced, and energy is saved.

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.