Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2002-05-15
2003-06-24
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S219000, C315S225000, C315S206000, C315S283000, C315S290000, C315SDIG004, C315SDIG007
Reexamination Certificate
active
06583586
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a brightness-regulating voltage-transforming circuit for high-pressure discharge lamp that provides better performance as compared with conventional circuits designed for the same purpose.
FIG. 1
is a circuit diagram of a conventional brightness-regulating voltage-transforming circuit for high-pressure discharge lamp previously designed by the same applicant of the present invention. As shown, the circuit mainly includes a voltage-transforming circuit consisting of a primary coil of a transformer T
1
, a first transistor Q
2
, a second transistor Q
3
, a first feedback resistance R
10
, a second feedback resistance R
11
, and a buffer inductance L
1
; and a brightness control circuit consisting of a transistor Q
1
, a buffer inductance L
1
, a diode D
1
, and other relevant resistors. The buffer inductance L
1
for the brightness control circuit is the same one buffer inductance L
1
included in the voltage-transforming circuit. That is, the brightness control circuit and the voltage-transforming circuit use the same one buffer inductance L
1
. When the transistor Q
1
is made, current passes through the buffer inductance L
1
, and a part of energy accumulates on the buffer inductance L
1
. When the transistor Q
1
is cut out, energy accumulated on the buffer inductance L
1
is released to produce high temperature and noise interference that has adverse influences on the high-pressure discharge lamp.
It is therefore desirable to develop an improved brightness-regulating voltage-transforming circuit for high-pressure discharge lamp to eliminate drawbacks existing in the conventional circuit designed for the same purpose.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a brightness-regulating voltage-transforming circuit for high-pressure discharge lamp that is able to reduce noise interference with the high-pressure discharge lamp and to increase the working efficiency thereof.
To achieve the above and other objects, the brightness-regulating voltage-transforming circuit for high-pressure discharge lamp of the present invention incorporates a diode into a brightness control circuit thereof. The diode is connected at an end to a juncture of a primary side of a transformer and an end of a buffer inductance, and at another end to a voltage source. When a transistor in the brightness control circuit is cut out, energy stored in the buffer inductance is regenerated and sent to the voltage source via the diode. As a result, the high-pressure discharge lamp has reduced noise interference and increased working efficiency.
REFERENCES:
patent: 3921005 (1975-11-01), Watrous
patent: 4204148 (1980-05-01), Gaertner
patent: 4398130 (1983-08-01), McFadyen et al.
patent: 4808886 (1989-02-01), Lathom et al.
Hwa Youn Co., Ltd.
Philogene Haissa
Pro-Techotr Inter-National Services
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