Start-up timer for a switching power supply

Details Start-up timer for a switching power supply Start-up timer for a switching power supply

1979-03-22

1982-08-10

Shoop, William M.

Electric power conversion systems

Current conversion

With starting arrangement

363 26, 363 97, H02P 1322

Patent

active

043441246

ABSTRACT:
Improved start-up circuitry is disclosed for a switching power supply including transformer inverting circuitry that is responsive to a pulse-width-modulated gating signal for providing a DC output voltage from an AC input voltage. The switching power supply further includes comparing circuitry for comparing the DC output voltage to a reference voltage and providing an error signal proportional to the difference therebetween, and control circuitry for pulse-width modulating the gating signal in response to the error signal. After initial AC power turn-on or after subsequent AC power interruptions, the start-up circuitry momentarily enables the control circuitry to pulse-width modulate the gating signal at a maximum duty cycle. The gating signal is otherwise pulse-width modulated at a minimum duty cycle by the control circuitry until the error signal is established. By momentarily pulse-width modulating the gating signal at a maximum duty cycle, the switching power supply may deliver a large amount of energy for quickly providing the DC output voltage under full load conditions.

REFERENCES:
patent: 4121282 (1978-10-01), Ohsawa
patent: 4180852 (1979-12-01), Koizumi et al.
C. J. Palmucci, "Switching Regulator Start-Up Circuit", IBM Technical Disclosure Bulletin, vol. 19, No. 3, Aug. 1976, pp. 978-979.

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