Kaige 4C7108 power supply

Published:2011/11/14 2:03:00 Author:May | Keyword: Kaige, power supply | From:SeekIC

Kaige 4C7108 adopts separated exciting single-end fly-back converter type switching power supply. Oscillating circuit adopts TDA83820. Main power supply output voltage is 115V. Voltage regulator circuit Voltage regulator circuit mainly consists of components of Q503, Q504, IC502, etc. Difference amplifier composed of Q503 and Q504, whichare error sampling circuit. D519 offers reference voltage for Q503. B pole of Q504 changes along with output voltage. When output voltage is too high, the break over level of Q504 is decrease, and Q503's C pole current is dividing, then it will decreasing. The current of IC502 is increasing. Internal resistance of IC502's pin 4, 5 is decreasing. The voltage of IC501's pin 9 is decreasing. The duty factor of widened pulse is decreasing. Then output voltage is decreasing. So it reaches the purpose of voltage regulation. It can change output voltage by adjusting VR504.



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