Double-ended converting circuit switching power supply circuit diagram

Published:2011/3/22 21:24:00 Author:Nicole | Keyword: switching power supply | From:SeekIC

Push-pull converter is double-ended converter. The high-frequency transformer work both sides of the hysteresis loop, it is a simple design and reasonable line for a wide application. The typical circuit as shown. Switching transistor VTl, VT2 turned on and off by the base drive circuit alternating incentive, inputing DC voltage Ui converted into high frequency square wave AC voltage. VTl turns on, Ui through VT1 added to the primary winding Nl of the transformer T1. Due to the role of the transformer, the cut-off transistor VT2 will be imposed on 2 times input voltage, that is 2Ui. When the base incentive disappears, VTl, VT2 tubes are closed. The collector voltage is input voltage Ui. Next half cycle, VT2 turn on, VT1 stop, VTl 2 is imposed on 2 times input voltage, followed by another two cut-off, the next cycle to start again. The main disadvantage of push-pull circuit is the voltage of switching transistor should reach 2 times of the input power. The peak voltage, take the network voltage of 220 (1 ± 10%) V for example, the maximum steady cut-off voltage is 680V, ​​coupled with the dynamic process of voltage spikes, switching transistors have to withstand more than 800V voltage.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/Switching-Regulator_Circuit/Double_ended_converting_circuit_switching_power_supply_circuit_diagram.html

Print this Page | Comments | Reading(3)