Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
1999-12-16
2003-02-25
Trieu, Van (Department: 2635)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S635000, C340S007320
Reexamination Certificate
active
06525666
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a power circuit for domestic electrical appliances having a remote control function, and more particularly to a power circuit which reduces a current consumed in the household electrical appliances during a waiting period of time.
As a conventional power circuit for household or domestic electrical appliances having a remote control function, there has been known a power circuit using means for converting an a.c. voltage into a d.c. voltage (hereinafter referred to as “AC-DC converter”) as shown in a circuit diagram of FIG.
3
. That is, an output voltage of the AC-DC converter
101
permits a control circuit for remote control, in this example, a microcomputer and an infrared ray receiving circuit,
103
for producing an output signal
110
in response to an infrared signal
115
received from an external controller to be driven.
SUMMARY OF THE INVENTION
In the circuit of
FIG. 3
, in a domestic electrical appliance such as a television, power must be continuously applied to the infrared ray receiving circuit and the microcomputer because the electrical appliance receives a remote control signal even if an image reception turns off. This is called “waiting-time consumed power”. However, the efficiency of the AC-DC converter is low, and a power of about 1 W is consumed only for such a waiting-time consumed power. Under existing environmental issues, a demand has been made to reduce the consumed power at the waiting time as much as possible, which cannot be achieved by the existing circuit structure at all.
In order to solve the above problem, electricity is stored in electric charge storing means such as a secondary battery or an electric double layer capacitor so as to supply power to the microcomputer and the infrared ray receiving circuit without always operating the AC-DC converter. Before a voltage across the electric charge storing means becomes lower than a given value, specifically, the lowest operating voltage of the microcomputer and the infrared ray receiving circuit, the AC-DC converter is operated to charge the electric charge storing means whereas before the voltage rises to and the given voltage, specifically, the highest operating voltage of the microcomputer and the infrared ray receiving circuit, the AC-DC converter stops charging the electric charge storing means. With the above operation, the operating frequency of the AC-DC converter is reduced so that the power consumed by the AC-DC converter which is the worst in power efficiency is reduced, thereby making it possible to reduce the entire waiting-time consumed power.
REFERENCES:
patent: 5216349 (1993-06-01), Kanouda et al.
patent: 5596261 (1997-01-01), Suyama
patent: 5734254 (1998-03-01), Stephens
patent: 5802467 (1998-09-01), Salazar et al.
patent: 5898234 (1999-04-01), Kitagawa
patent: 6025704 (2000-02-01), Elliott
patent: 6082122 (2000-07-01), Madenokouji et al.
patent: 0632563 (1995-01-01), None
patent: 2292828 (1996-03-01), None
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