Dual input power supply

Details Dual input power supply Dual input power supply

1990-05-02

1992-08-11

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to connect the input to diverse power sources

363 53, 361190, H02M 704

Patent

active

051385473

ABSTRACT:
A simplified dual input power supply of the type which automatically responds to either a low level AC supply voltage (e.g. 115 volts) or a high level AC supply voltage (e.g. 230 volts) to provide a single level DC output voltage (e.g. 300 volts). The power supply switches between a voltage doubler operation and a full-wave rectifier operation dependent upon the level of the AC supply voltage. For a low level AC supply voltage an energizing circuit is completed to a relay, or the like, which switches in the voltage doubler circuit configuration. For a high level AC supply voltage, a Zener diode circuit conducts and breaks the energizing circuit to de-energize the relay so as to switch in the full-wave rectifier configuration. A protective circuit is provided to prevent the power supply from switching back to its low input voltage mode less the input voltage drops below a predetermined level for a predetermined time interval.

REFERENCES:
patent: 4590546 (1986-05-01), Maile
patent: 4780805 (1988-10-01), Chewuk et al.
patent: 4845607 (1989-07-01), Nakao et al.

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