| 摘要 |
A power supply device has a soft starting circuit 12, which is composed of a transistor Tr9 having its emitter connected to the emitter of a transistor T r1 of which the base serves as a non-inverting input terminal of a comparator 11 a nd having its collector grounded, a clamp circuit 10 connected between the base of the transistor Tr1 and the base of the transistor Tr9, a constant-current source 7 receiving a supply voltage Vcc through a switch 2, a capacitor Cs having one end connected to the base of the transistor Tr9 and having the other end grounde d, a switch 9 connected to the capacitor Cs, having its contact "c" connected to the constant-current source 7, and having its contact "d" connected to a dischar ge circuit 8, and the discharge circuit 8.
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