Shutdown circuit for a switching power supply

Details Shutdown circuit for a switching power supply Shutdown circuit for a switching power supply

G - Physics

05

F

323/6

G05F 1/46 (2006.01) H02H 7/12 (2006.01) H02M 3/335 (2006.01)

Patent

CA 1127711

CM-78947 AN IMPROVED SHUTDOWN CIRCUIT FOR A SWITCHING POWER SUPPLY ABSTRACT OF THE DISCLOSURE A switching mode power supply provides a D.C. output voltage having a value related to the duty cycle of the supply's controlled oscillator produced signal. The in- ventive shutdown circuit inhibits operation of the supply if the duty cycle increases to a value indicative of failure of the supply to produce a minimum desired output voltage. Operation of the supply is inhibited for a predetermined shutdown interval following which a restart cycle deactivates the shutdown circuit for a period to allow the supply to attempt to establish its desired output.

320213

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