Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-07-10
2007-07-10
Vu, Bao Q. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S224000, C323S285000
Reexamination Certificate
active
11278822
ABSTRACT:
A control circuit for DC-DC converters and a control method therefor wherein unstable operation in which output voltage fluctuates can be detected and the unstable operation be prevented from continuing are provided. The control circuit includes: an error amplifier ERA1that has an inverting input terminal to which detecting voltage V1detected according to output voltage is inputted and a non-inverting input terminal to which reference voltage e1is inputted, and amplifies the difference voltage of detecting voltage relative to reference voltage e1; and a detection unit50that detects that an error output signal VOP of the error amplifier ERA1stays at a predetermined voltage level. The detection unit50includes: a signal determination unit that determines that the predetermined voltage level is out of a normal operating range; and a duration count unit that detects that the predetermined voltage level stays out of the normal operating range for a predetermined time by the signal determination unit.
REFERENCES:
patent: 5396165 (1995-03-01), Hwang et al.
patent: 5818707 (1998-10-01), Seong et al.
patent: 6987378 (2006-01-01), Steele
patent: 2005-117784 (2005-04-01), None
Arent & Fox LLP
Fujitsu Limited
Vu Bao Q.
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