Title:
POWER CIRCUIT FOR ELECTRIC APPARATUS
Document Type and Number:
Japanese Patent JPH01148060
Kind Code:
A
Abstract:
PURPOSE:To perform a stabilized power supply by operating an apparatus through a forced driving pulse with a frequency higher than that of an audible range at the time of an ordinary operation and by setting the frequency of the pulse at a specified value within a stable operating range higher than the frequency of the ordinary operation in standby operation with a light load. CONSTITUTION:At the time of an ordinary operation, a power mode switching signal applied to a terminal 15 shows a low level, transistors(Trs) Q1-Q3 are operated to feed a supply voltage to terminals 13, 14. In this case, the Tr Q1 is forced to operate by a horizontal retrace line pulse 18a from a pulse generator circuit 18 and an operating frequency is made constant without being affected by load variations. At the time of a power standby mode, a power mode switching signal applied to the terminal 15 is changed to a high level, the Tr Q5, Q4 are turned ON, and the Tr Q1 performs a self-oscillation operation. By the self-oscillation operation, a power output of the terminal 13 is forced to fall in a lightly loaded state for an oscillation at a high frequency. In this manner, an auxiliary power output for driving a load circuit such as a remote control signal receiving circuit 19 is stably supplied from the terminal 14.
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Inventors:
ZENITANI KENZO
NAKAJIMA HIROSHI
NAKAJIMA HIROSHI
Application Number:
JP30710687A
Publication Date:
June 09, 1989
Filing Date:
December 03, 1987
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
H02M3/155; H02M3/28; (IPC1-7): H02M3/155; H02M3/28
Attorney, Agent or Firm:
Susumu Ito