| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage detection circuit of low cost and a voltage adjustment technique, in a switch mode power source. SOLUTION: In one aspect, the voltage detection circuit which is used for a power source regulator is provided with a transformer including detection winding and output winding. A first diode is connected with the detection winding, a first resistor is connected with the first diode, and a first capacitor is connected with the first resistor and the first diode. A second diode is connected with the first capacitor, the first resistor and the first diode. A second capacitor is connected with the second diode in such a manner that a voltage between both ends of the second capacitor shows a voltage between both ends of the output winding. In one embodiment, the first capacitor is discharged by substantially shorter period than the second capacitor. The second capacitor is charged without being substantially affected by leakage inductance energy from the transformer. COPYRIGHT: (C)2004,JPO
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