Sample-and-hold circuit for a switched-mode power supply

Details Sample-and-hold circuit for a switched-mode power supply Sample-and-hold circuit for a switched-mode power supply

1997-07-28

1999-02-23

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 95, 327 96, G11C 2702

Patent

active

058748415

ABSTRACT:
A sample-and-hold circuit is provided for a switched-mode power supply of the type having a transformer with a primary winding, an auxiliary winding and a secondary winding, with a switching transistor coupled in series with the primary winding and a sample-and-hold capacitor for storing a voltage proportional to an output voltage of the auxiliary winding and coupled to a controlled terminal of the switching transistor in a feedback loop which normally operates in a closed-loop mode for switchably regulating the power supply. To prevent the feedback loop from being driven to an open-loop or "stuck" mode of operation, a discharge capacitor is provided which is switchably coupled in parallel with the sample-and-hold capacitor to discharge excess voltage from the sample-and-hold capacitor and thereby restore the feedback loop to its normal closed-loop operating mode.

REFERENCES:
patent: 4004190 (1977-01-01), Simpson
patent: 5453921 (1995-09-01), Shutts
patent: 5498995 (1996-03-01), Szepesi et al.
patent: 5650715 (1997-07-01), Massie

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