Switching regulator with high efficiency starting resistor...

Details Switching regulator with high efficiency starting resistor... Switching regulator with high efficiency starting resistor...

H - Electricity

02

M

321/29

H02M 3/335 (2006.01) H02H 7/12 (2006.01) H02M 1/00 (2006.01)

Patent

CA 1130857

ABSTRACT OF THE DISCLOSURE A switching regulator includes an inrush current protec- tive resisitor and a starter circuit for a pulse width modulator consisting of a starting resistor and a capacitor. At initial starting mode, the inrush current protective resistor is connected to the starter circuit, and after starting resistor are discon- current protective resistor and starting resistor are discon- nected so as to reduce power dissipation or consumption thereby. At the same time, a DC voltage source for the pulse width modula- tor is derived from a rectified secondary voltage through the starting capacitor. -1-

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