Title:
CONSTANT VOLTAGE REGULATED POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JPS56164412
Kind Code:
A
Abstract:
PURPOSE:To obtain a stable outout voltage with less power loss, by controlling a current of a power transistor in which the emitter is taken as a nonregulated power supply input and the collector is taken as the output side of a constant voltage, by a control circuit supplying power from a constant voltage source side only. CONSTITUTION:A reference voltage generator 6 produces a reference voltage at start, and an output current of a differential voltage amplifier 5 increases the output voltage until the base current of an output transistor 3 can be increased. Further, when an output voltage is a set value, a start circuit independently of a feedback loop is provided and the reference voltage of a generator 6 and the amplifying power of the amplifier 5 are supplied from the constant voltage output only of constant voltage output terminals 7, 8. Thus, the amplification factor of the differential voltage amplifier 5 can be made stable easily and the stability of the output voltage can be made excellent.
Inventors:
SHIROKAWA MICHIO
Application Number:
JP6654980A
Publication Date:
December 17, 1981
Filing Date:
May 21, 1980
Export Citation:
Assignee:
KIGAWA DENSHI GIKEN KK
International Classes:
G05F1/56; (IPC1-7): G05F1/56