Buck chopped wave switching power supply circuit diagram

Published:2011/3/24 21:42:00 Author:Nicole | Keyword: switching power supply | From:SeekIC

This is a buck chopped wave switching power supply circuit diagram. When the switching element VT is controlled as saturated conduction, the energy is stored in inductor L and capacitor C, and also is fed to the load. When the switching element VT is controlled as cut-off state, the energy stored in inductor and capacitor continue to supply the load, the diode VD constitute a current loop. Because of the switching element VT in series with the load resistor RL, so it is called series switching power supply. Chopped wave switching power supply is a DC power supply, can obtain unidirectional square wave from switch circuit, and then can get a different steady DC which is different from the input voltage after filtered. The buck is whether the input voltage Ui is positive or negative, the output voltage Uo is always lower than the input voltage Ui, that is | Uo | ≤ | Ui |. If the adjustment switching element VT has been conducting, the off-time is zero, then Uo = Ui; if VT has been cut-off, on-time is zero, then Uo = 0V. As the ratio of ton and toff is different, the output voltage Uo is between O ~ Ui.



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