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Patent Searching and Data


Title:
SWITCH CIRCUIT
Document Type and Number:
Japanese Patent JPH077844
Kind Code:
A
Abstract:

PURPOSE: To stop a cooling fan unit used for television receivers, etc., at a low temperature and, at the same time, to prevent the occurrence of an excessive rotation of the unit and noise from the unit when the unit is normally operated.

CONSTITUTION: A switch circuit is provided with a switch control circuit 7 which passes or interrupts the signal of the abnormality detection circuit 6 of a cooling fan unit in accordance with the level of the output voltage of a fan rotating speed control circuit 1.


Inventors:
HIRASAWA KAZUO
Application Number:
JP14351293A
Publication Date:
January 10, 1995
Filing Date:
June 15, 1993
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
F04D27/00; G05D23/00; H02H7/085; (IPC1-7): H02H7/085; F04D27/00; G05D23/00
Attorney, Agent or Firm:
Akira Kobiji (2 outside)