Published:2011/4/22 18:53:00 Author:Nicole | Keyword: switching power supply | From:SeekIC
This is a pulse Ni switching power supply circuit diagram, it is Kaige 4D17U produced by radio four factory in Shanghai. The power supply of 35cm black and white TV.
The main technical indicators are as follows: Output voltage: 12V; Output Current: 1A; power consumption <20W; efficiency> 64%; resistance <0.075Ω; ripple <15mV; mains voltage: 160 ~ 240V.
As shown, 6VDl, 6VD2 form full-wave rectifier circuit; 6C3is filter capacitor; 6C1, 6C2 are used to weaken the inrush current; 6VT7, 6VT2, 6VT3 and 6R4, 6C9 constitute the self-excited multivibrator, 6VT7 also is the switching tube.
When the 12V output voltage decreases for some reason, the base of error amplification 6VT5 obtain the voltage from the sampling circuit 6R6, 6R9, 6R8 also drop, the collector voltage of 6VT5 rises, potential base 6VT3 increases, the output pulse of switch controls tube 6VT7 widen, then the reducing voltage rises again. On the contrary, to adjust on the opposite by the above process when the output voltage goes down, to make the output voltage stable.
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