Published:2011/11/21 21:19:00 Author:May | Keyword: ringing choke type, switching, stabilized voltage supply | From:SeekIC
Ringing choke type is a kind of self-oscillation feedback converting model. Its basic principle is shown in the diagram. When it adds input power supply, the current passes Rg and flows to the base of switching tube VT1 to make VT1 break over. At this time, thediode of transformer secondary polarity is in reverse bias. The diode has no current. So the current of VT1 collector and transformer winding Np is the same. Rg is called starting resistor.
Once VT1 is breaking over, transformer primary winding Np is added input voltage, and coil NB also generates induction voltage UB. Also, coil NB adds current IB to the base of VT1to make VT1 further breaking over.
Transformer generates electromotive force, of which the polarity is the contrary of input voltage's polarity. When VT1 is cutting off, its power is the samewith thetransformer before VT1 is cut off.
The diode of transformer secondary polarity is breaking over due to the function of reverse electromotive force. The power transformer stored in unit time is equal to output power.
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