Power supply with automatic shutdown

Details Power supply with automatic shutdown Power supply with automatic shutdown

1976-12-29

1978-05-30

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 89, H02M 118

Patent

active

040927113

ABSTRACT:
A power supply provides a low-level DC voltage to DC load circuits by first rectifying the standard AC voltage and thereafter reducing the rectified AC voltage to the low-level DC voltage. The reduction of the rectified AC voltage to the low-level DC voltage is accomplished by a power transformer which is switched on or off by a pair of switching transistors. The switching transistors are operated in a "push-pull" mode by a pair of control transformers operating in combination with a control circuit. The control circuit produces various pulse conditions in the control transformers which turn their respective switching transistors on and off in a prescribed manner. An overcurrent sensing and control device prevents damage to components. The power on/fail circuit signals the load as to the status of the regulated load voltage and guarantees power for orderly shutdown after an input power outage.

REFERENCES:
patent: 3341748 (1967-09-01), Kammiller
patent: 3457560 (1969-07-01), McKinley
patent: 3505663 (1970-04-01), Yule
patent: 3571707 (1971-03-01), Houck
patent: 3789242 (1974-01-01), Cantor
patent: 3795905 (1974-03-01), Wright
patent: 3836854 (1974-09-01), Wehman
patent: 3918043 (1975-11-01), Beck

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