Control circuit having two-level under voltage lockout...

Details Control circuit having two-level under voltage lockout... Control circuit having two-level under voltage lockout...

2007-12-18

2007-12-18

Nguyen, Matthew V. (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C363S021120, C363S056010

Reexamination Certificate

active

11360445

ABSTRACT:
The invention presents a switching power control circuit including two levels of under voltage lockout to improve the protection of the power supply. An input terminal of control circuit is connected to a supplied capacitor to supply the power of the control circuit. The supplied capacitor is charged through a start resistor for the start-up. Once the input voltage reaches a start-up voltage, the control circuit will start the operation. After that, the power is further supplied from a transformer of the power supply. If a fault condition is occurred, the switching of the control circuit will be stop and the supplied capacitor will be discharged. When the input voltage is discharged lower than a first under-voltage lockout threshold, the circuits of control circuit are shut down to consume lower power. Furthermore, once the input voltage is discharged lower than a second under-voltage lockout threshold, the control circuit will enable the start-up again. During the discharge period from the first under-voltage lockout threshold to second under-voltage lockout threshold, the switching of the control circuit is off and the discharge time is increased which reduces of the switching duty cycle and improves the protection of the power supply.

REFERENCES:
patent: 4210947 (1980-07-01), Koizumi
patent: 5784231 (1998-07-01), Majid et al.
patent: 6807075 (2004-10-01), Miermans
patent: 6922345 (2005-07-01), Nishida et al.
patent: 6980443 (2005-12-01), Nagano et al.

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