Soft-start capacitor discharge circuit

Details Soft-start capacitor discharge circuit Soft-start capacitor discharge circuit

1985-06-28

1986-11-04

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 56, 323901, 323908, H02H 7122

Patent

active

046213139

ABSTRACT:
In a switched mode power supply during start-up, an increasing charge on a soft-start capacitor controls a pulse width modulator for increasing the length of drive pulses provided to a pair of switching transistors until a reference voltage level is reached, after which stable power supply operation ensues. Detection circuitry senses a low power supply output voltage such as arising from input line interruptions and rapidly discharges the soft-start capacitor and prevents the recurrence of the soft-start mode of operation before the soft-start capacitor is fully discharged to prevent overloading of power supply output semiconductor devices upon the resumption of normal input voltage to the power supply.

REFERENCES:
patent: 4207516 (1980-06-01), Babcock
patent: 4315304 (1982-02-01), Marez et al.
patent: 4473759 (1984-09-01), Mahabadi
patent: 4494064 (1985-01-01), Harkness

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