Title:
CONSTANT-VOLTAGE CIRCUIT
Document Type and Number:
Japanese Patent JPS5731014
Kind Code:
A
Abstract:
PURPOSE:To greatly reduce the power consumption of a controlling transistor, by providing a self-holding type switching circuit between the base of the controlling transistor inserted in series into one line, and the other line. CONSTITUTION:When voltage of a point (b) of the output side of a rectifying circuit 2 rises along a half-wave rectifier waveform, a controlling transistor TR31 becomes conducting. Therefore, a capacitor 41 is charged, and voltage of a point C rises. When voltage of this point C exceeds threshold voltage of a constant-voltage diode 33, a current starts to flow to the gate of a thyristor through a resistance 342. When voltage of the point C further rises, the thyristor 341 is turned on, a current which has been flowing through a resistance 32 flows into the thyristor 341, the thyristor 341 self-holds the on state, and also the TR31 is cut off. This state is continued until an anode current of the thyristor 341 becomes below a holding current. Subsequently, while the TR31 is off, to a load circuit 42 is supplied electric power by charge stored in the capacitor 41.
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Inventors:
WATANABE YASUYUKI
MIYAKE RIYOUICHI
OGATA KAZUYUKI
MIYAKE RIYOUICHI
OGATA KAZUYUKI
Application Number:
JP10571180A
Publication Date:
February 19, 1982
Filing Date:
July 31, 1980
Export Citation:
Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
G05F1/56; (IPC1-7): G05F1/56
Domestic Patent References:
| JPS52110442A | 1977-09-16 |