Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-06-21
2005-06-21
Patel, Rajnikant B. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021150
Reexamination Certificate
active
06909616
ABSTRACT:
A power supply and power supply control device for an electronic equipment having a key-off function. A switching mode power supply is controlled by a key-off part and a power supply control part. A power key outputs a key-off signal in response to a manipulation of a user. The power supply is controlled by controlling an output of a pulse width modulator of the switching mode power supply. The key-off part outputs a power-off signal to stop an operation of the pulse width modulator in response to detecting that the key-off signal is output for a predetermined time. The power supply control part outputs a signal to start the operation of the pulse width modulator in response to an externally supplied power-on signal or an on state of a power switch. Holding the power switch in the on state for greater than the predetermined time generates an equivalent key-off signal.
REFERENCES:
patent: 4928220 (1990-05-01), White
patent: 4937728 (1990-06-01), Leonardi
patent: 5313381 (1994-05-01), Balakrishnan
patent: 5617016 (1997-04-01), Borghi et al.
patent: 5852550 (1998-12-01), Majid et al.
Patel Rajnikant B.
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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