| 摘要 |
PURPOSE: An auxiliary power supply stabilization circuit is provided, which can stabilize an output voltage of an auxiliary power supply circuit by making an input voltage induced to the input part of the auxiliary power supply constant. CONSTITUTION: The first and the second rectification device(BD1,BD2) rectify the first input AC power into a main and an auxiliary DC power respectively, and the first inductor(L1) is connected serially to an output port of the first rectification device. An anode of the first diode(D1) is connected between the output port of the first rectification device and the first inductor and a cathode of the first diode is connected to the first output port(+385V) of the main DC power. An anode of the second diode(D2) is connected to another side of the first inductor and a cathode of the second diode is connected to the first output port of the main DC power. The first switching device(SW1) is connected to the first output port of the main DC power and to the cathodes of the first and the second diode, and another side of the first switching device is connected to the second output port of the main DC power. A primary part of a transformer(T1) is connected between an output port of the second rectification device and a ground port(GND) and a secondary part of the transformer is connected to an output port(AUX) of the auxiliary DC power. One side of a thermistor is connected to the cathodes of the first and the second diodes and to the first output port of the main DC power, and another side of the transformer is connected to an anode of the third diode. And the anode of the third diode is connected to the thermistor and a cathode of the third diode is connected to the output port of the second rectification device. And one side of the second switching device(SW2) is connected to the ground port, and another side of the second switching device is connected to the primary part of the transformer.
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