Two-way output normal shock type 150W precision switch stabilized voltage supply

Published:2011/4/20 5:07:00 Author:May | Keyword: Two-way output, normal shock type, 150W, precision switch, stabilized voltage supply | From:SeekIC

+5V, +12V two-way output normal shock type 150W precision switch stabilized voltage supply is shown in the diagram. This power supply uses one pieces of TOP227Y(IC1), linearity optical couple CNY17-2 (IC2, the production of Germany Telefunken company) , adjustable precision parallel regulator TL431 (IC3). AC input voltage is 110V/220V. When it is low voltage input, power supply's efficiency can reach 77% (typical value). S is power supply choosing switch. When S is closed, it is choosing AC voltage IIOV voltage doubling rectifying circuit. Its working principle is shown in the following diagram. Supposing the positive half period a point of AC is positive potential, b point is negative potential, at this time, the diode VDb and VDd on rectifier bridges is breaking over, VDa an VDd is cutting off, shown in diagram (a). 110V AC can charge to C1 according to the following ways: u→a→C1→VDc→b, it can charge Uc1 to about ×llOV=155V, its polarity is that up end is positive and down end is negative. When in negative half period, b point is positive potential, a point is changing to negative potential, the equivalent circuit is shown in diagram (b). At this time, VDa, VDd is breaking over, VDb, VDc is cutting off, the current can charge to C10 according to following ways: u→b→VDa→C10→a, it can make Uc10≈115V, and the polarity is also that up end is positive and down end is negative.



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