A SWITCHING CIRCUIT FOR SOFT SWITCHING STEP-DOWN CONVERTER WITH HIGH POWER FACTOR

摘要

according to the invention, a diode rectifier circuit and the output switching circuit, in parallel with the capacitance of the input capacitor and the weight loss you type switch of the buck type converter, the output of the voltage of the uc99dub300uc2dc. to improve the power factor, and frequency converter the circuit of the reactor current discontinuous mode operation, according to the current, zero voltage soft switching to the use efficiency of the inverter circuit, and to improve the high frequency converter. soft switching power and the switching circuit in the invention, according to the law. the switching circuit of the buck type converter on the input ac power supply voltage into dc signal (es) in the brain in order to stay put or diode (BD) in the brain. the diode (BD) of the output end of the parallel connected capacitor (c 20), the the diode (BD (out) of the output. one of the associated first switch (S11)and the first diode (D11), the first switch (S11), and the first diode (D11) of each series was the second diode (D12), and the second switch (S12);the switch (S11, S12) and diode (D11, D12) of the connection point is connected to you (the c10) capacitor, the second switch (S12) and the second diode (D12) of the output connection point and the ground connection between the reverse to the reflux diode (d), the smoothing inductor (Lr) and capacitor (Cd ), including the composition of the uce28, dc power voltage and increase the power factor and improve the converter's efficiency, and to increase the effectiveness of the quality is not only a special switching sequence is not necessary to give the power of the will. the current to relieve the pressure of the life of the people to extend the results to the invention is very good.