Title:
POWER SOURCE CIRCUIT
Document Type and Number:
Japanese Patent JPS61134821
Kind Code:
A
Abstract:
PURPOSE:To prevent the malfunction of a control part at the time when a power source is off, by providing a constant-voltage element between an output of a main power source part and a power source of a part to which power is supplied. CONSTITUTION:A power source circuit is constituted of a main power source part 1, a logic circuit power source part 2, a control part 3 and a part 4 to be controlled. In this case, a constant-voltage element 71 is connected between an output of the main power source part 1 and the part 4 to be controlled. As a result, a power supply voltage of the part to be controlled 4 becomes (an output voltage of the main power source part 1)-(a both-end voltage of the constant-voltage element 71), therefore, the time when the part to be controlled 4 becomes a state impossible for operation after the power source has been turned off can be made shorter than a fall of the control part 3. In this way, it does not occur that the part to be controlled 4 becomes inope rable, and the part 4 to be controlled causes malfunction, before an output signal of the control part 3 becomes indefinite.
Inventors:
MOCHIDA YOSHIO
SHIMADA HIROMICHI
SHIMADA HIROMICHI
Application Number:
JP25806084A
Publication Date:
June 21, 1986
Filing Date:
December 06, 1984
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05F3/18; (IPC1-7): G05F3/18
Domestic Patent References:
| JPS5812026A | 1983-01-24 | |||
| JPS5836409B2 | 1983-08-09 |
Attorney, Agent or Firm:
Akira Kobiji (2 outside)