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Practical circuit of full bridge switching stabilized voltag

2015-03-20 22:42  
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Practical circuit of full bridge switching stabilized voltage supply
The diagram is practical circuit of full bridge switching stabilized voltage supply. It is 1500W double pole power switching stabilized voltage supply circuit controlled by CW194. In the circuit, four double pole high back voltage transistors F661 are switching tube. Controlled by integrated circuit CW494, two pairs tubes are breaking over and cutting off in turns. It can change DC to high frequency AC. Then the high frequency AC is passing high frequency transformer to step-down. After rectifying and filtering, it will get 12V DC stabilized voltage. F661 power switching tube's BVceo≥400V. Time of toff is 1μs. So in the conditionwith high power, its power consumption is small. The core component of this circuit is high-frequency transformer. Its magnetism performance has high requirement: frequency characteristic requires to reach megahertz; saturation magnetic flux density must reach to 5000Gs; magnetic hysteresis loss must be small; when it uses EC70 magnetic core, output power is 1000W; when it uses EC90 magnetic core, output power is 2000W.