Title:
POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JPS5924319
Kind Code:
A
Abstract:
PURPOSE:To prevent a drop of the terminal voltage of a battery due to a large current which flows instantaneously to cause an unstable operation of an equipment, by connecting a current limiting circuit between a power supply terminal and a load circuit. CONSTITUTION:When the terminal voltage of a battery 1 is higher than the Zener voltage of a constant voltage diode 13 and voltage VBE of a transistor TR10, the base current of the TR10 flows through a resistance 12. Thus the collector and emitter of the TR10 become conductive, and a resistor 9 is short- circuited. Therefore a fluctuating load 4 is connected directly to the battery 1. While no Zener current flows when the terminal voltage of the battery 1 has a drop. Accordingly the base current to the TR10 does not flow and is converted to cut off state. Then the resistor 9 is set in series to the load 4 and limits the load current. This ensures a stable operation despite an abnormal level of the power supply voltage.
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Inventors:
IKEDA MASAHARU
Application Number:
JP13346082A
Publication Date:
February 08, 1984
Filing Date:
July 29, 1982
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05F1/56; G05F3/18; (IPC1-7): G05F1/56
Domestic Patent References:
| JPS5138050A | 1976-03-30 | |||
| JPS55114122A | 1980-09-03 | |||
| JPS5592531A | 1980-07-14 |
Attorney, Agent or Firm:
Akira Kobiji (2 outside)