Power supply circuit for selectively supplying normal read volta

Details Power supply circuit for selectively supplying normal read volta Power supply circuit for selectively supplying normal read volta

1995-02-27

1997-09-09

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With voltage multiplication means

H02M 700

Patent

active

056662769

ABSTRACT:
The power supply circuit of the present invention comprises a first transfer circuit provided between a first power supply terminal and a supply voltage output terminal; a second transfer circuit provided between a second power supply terminal and said supply voltage output terminal; a first control circuit for making the first transfer circuit nonconductive at least when a first supply voltage is applied to the first power supply terminal, and a second supply voltage higher than the first supply voltage is applied to the second power supply terminal; and a second control circuit for making the second transfer circuit conductive only when said first supply voltage is applied to the first power supply terminal, and the second supply voltage is applied to the second power supply terminal.

REFERENCES:
patent: 4405868 (1983-09-01), Lockwood
patent: 4964084 (1990-10-01), Jung et al.
patent: 4979088 (1990-12-01), Misaki et al.
patent: 5093586 (1992-03-01), Asari
patent: 5412331 (1995-05-01), Jun et al.
patent: 5412337 (1995-05-01), Kumakura

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