Constant voltage generating circuit having step-up circuit

Details Constant voltage generating circuit having step-up circuit Constant voltage generating circuit having step-up circuit

1994-11-30

1996-03-12

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With voltage multiplication means

363 60, 327536, H02M 318, G05F 316

Patent

active

054991838

ABSTRACT:
A constant voltage generating circuit comprises a charge pump circuit for generating a high voltage on a high voltage output terminal, a clamp circuit having a P-channel MOSFET having a drain and a gate interconnected to each other and a source connected to the high voltage output terminal and an anode-grounded zener diode having a cathode connected to the drain of the P-channel MOSFET. A charge detecting circuit generates a charge detection signal when the amount of electric charge having flowed through the clamp circuit reaches a predetermined value. A clock control circuit includes a RS flipflop reset by a reset signal and set by the charge detection signal, and operates to stop application of a clock signal to the charge pump circuit on the basis of an output of the RS flipflop.

REFERENCES:
patent: 4871979 (1989-10-01), Shearer et al.
patent: 4876462 (1989-10-01), Kobatake et al.
patent: 5197033 (1993-03-01), Watanabe et al.
patent: 5394027 (1995-02-01), Park
patent: 5432469 (1995-07-01), Tedrow et al.
patent: 5436821 (1995-07-01), Inoue

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