Capacitor charging circuit with a soft-start function

Details Capacitor charging circuit with a soft-start function Capacitor charging circuit with a soft-start function

2007-02-13

2007-02-13

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Capacitor charging or discharging

Reexamination Certificate

active

10710997

ABSTRACT:
When a primary winding current increases to an upper limit determined by a reference voltage having a soft-start characteristic, a power switch is turned OFF. When a secondary winding current decreases to a lower limit determined by another predetermined reference voltage, the power switch is turned ON. A minimum ON-time limiting unit prevents the power switch from being turned OFF before a minimum ON-time expires. The minimum ON-time may be provided with a soft-start modulation. A minimum OFF-time limiting unit prevents the power switch from being turned ON before a minimum OFF-time expires. A maximum ON-time limiting unit prevents the power switch from still remaining ON after a maximum ON-time expires.

REFERENCES:
patent: 6411064 (2002-06-01), Brink
patent: 6417649 (2002-07-01), Brink
patent: 6518733 (2003-02-01), Schenkel et al.
patent: 6597221 (2003-07-01), Hall et al.
patent: 6636021 (2003-10-01), Schenkel et al.
patent: 6683442 (2004-01-01), Ferencz et al.
patent: 2004/0130359 (2004-07-01), Tzeng et al.

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