Power supply gradually developing an output voltage when switche

Details Power supply gradually developing an output voltage when switche Power supply gradually developing an output voltage when switche

1989-01-31

1989-10-31

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With starting arrangement

307 85, 307228, 323901, H02M 7517, H02M 75375

Patent

active

048781649

ABSTRACT:
The damaging effects caused by an abrupt rise of the supply voltage on particularly sensitive circuits when power is returned to the distribution network after a blackout, are prevented by providing the power supply with means for controlling a gradual rise of the output voltage thereof in accordance with a pre-established ramp when the power supply is switched-on. These means utilize a microprocessor driving at least one low-to-high type level shifter having a load formed by a network of resistors with scaled values, for generating an output analog voltage signal corresponding to a digital value presented by the microprocessor at the logic gate driving the level shifter circuit. The analog voltage signal, properly buffered, is applied to a control terminal of the power supply.

REFERENCES:
patent: 4375614 (1983-03-01), Steiner
patent: 4417218 (1983-11-01), Berke
patent: 4598351 (1986-07-01), Fair et al.
patent: 4628431 (1986-12-01), Kayser

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