Pulse width modulated power supply circuit

H - Electricity – 02 – M

Patent

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321/29

H02M 3/335 (2006.01) H02M 1/08 (2006.01) H02P 13/22 (1980.01)

Patent

CA 1077136

ABSTRACT OF THE DISCLOSURE In a power supply circuit having a circuit for supplying an input DC voltage through a switching element to a winding, a circuit for producing a desired DC voltage by switching the switching element with a pulse and a circuit for detecting the level of the DC output voltage, and changing the duty ratio of the pulse with the detected output so as to stabilize the DC output voltage at a constant value. There is provided a circuit which limits the maximum value of the duty ratio of the pulse. -1-

270190

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