Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1997-02-06
1998-08-25
Berhane, Adolf
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323207, 363 89, G05F 1613, G05F 170
Patent
active
057986355
ABSTRACT:
A combination PFC-PWM integrated circuit converter controller having a power factor correction stage and a pulse-width modulation stage. The power factor correction stage provides unity power factor and a regulated intermediate output voltage by sensing a current in the power factor correction circuit and by sensing the regulated intermediate output voltage in a voltage control loop. The regulated intermediate output voltage is sensed by an error amplifier that includes a current mirror. A dc supply voltage for powering the integrated circuit is generated that is representative of the regulated intermediate output voltage. The dc supply voltage is sensed for an overvoltage protection function. By sensing the intermediate regulated output voltage in the voltage control loop and by sensing the dc supply voltage for overvoltage protection, a component failure is less likely to affect both functions than if a single voltage was sensed for both functions. The pulse-width modulation stage waits a predetermined delay time after start up for the output voltage to rise before beginning the pulse-width modulation function. The delay time is determined by an amount of time taken to charge a capacitor to a predetermined voltage after start up. The capacitor is charged by a current source that is switched on and off according to a clock signal such that the capacitor is charged only a portion of time. Therefore, a larger current source may be used than otherwise which results in more reliable control of the delay time.
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Chee Alland
Hsu Calvin
Hwang Jeffrey H.
Yu Donald
Berhane Adolf
Micro Linear Corporation
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