Charge pump circuitry having low saturation voltage and current-

Details Charge pump circuitry having low saturation voltage and current- Charge pump circuitry having low saturation voltage and current-

1987-05-15

1989-03-14

Salce, Patrick R.

Electric power conversion systems

Current conversion

With voltage multiplication means

363 63, H02M 318

Patent

active

048129615

ABSTRACT:
A charge pump circuit is integrated form utilizes a dual emitter transistor switch having low saturation voltage. The low saturation voltage for the transistor is provided by deriving a base bias voltage from the doubled voltage (2V.sub.cc) and a collector voltage from the voltage supply (V.sub.cc). Current-limiting for the transistor is provided by connecting one emitter to the base bias circuitry whereby the second emitter acts as a collector when the transistor saturates, thereby limiting the base drive and causing current-limiting.

REFERENCES:
patent: 2056376 (1936-10-01), Travis
patent: 4679134 (1987-07-01), Bingham et al.

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