Back-to-back capacitor charge pumps

Details Back-to-back capacitor charge pumps Back-to-back capacitor charge pumps

1990-04-05

1991-04-16

Stephan, Steven L.

Electric power conversion systems

Current conversion

With voltage multiplication means

307110, 363 59, H02M 318

Patent

active

050087991

ABSTRACT:
A charge pump circuit is provided comprising a first MOSFET capacitor ("pumping capacitor"), two other MOSFET capacitors ("back-to-back capacitors") connected together with a common junction of the back-to-back capacitor in series with the pumping capacitor, a voltage clamp connected to the common node of all three MOSFET capacitors, and a diode for output of the charge pumped. A number of these charge pump circuits may be cascaded to form a multi-stage charge pump circuit. Each charge pump circuit may attain output voltage higher than the oxide breakdown voltage of each individual MOS capacitor. This charge pump circuit can also operate under low voltage power supply conditions.

REFERENCES:
patent: 4559548 (1985-12-01), Iizuka et al.
patent: 4636930 (1987-01-01), Bingham et al.
patent: 4752699 (1988-06-01), Cranford et al.
patent: 4807104 (1989-02-01), Floyd et al.
patent: 4812961 (1989-03-01), Essaff et al.
patent: 4888677 (1989-12-01), Grimm et al.
patent: 4935644 (1990-06-01), Tsujimoto

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