Patent ID: 6275013
Filing Date: 2001-08-14
Classification: H02M

Abstract:
A switching power supply circuit, comprising:an inductor having a first terminal coupled to a DC power supply,a switching element coupled to a second terminal of said inductor,a rectifying and smoothing circuit coupled to said second terminal of said inductor; anda zener diode coupled to an output of said rectifying and smoothing circuit,an auxiliary coil magnetically coupled to said inductor,wherein current flowing through said inductor is switched by using said switching element to obtain a boosted DC output,wherein an internal resistance of said circuit on said inductor side viewed through said rectifying and smoothing circuit is employed as a serial resistor that generates a voltage drop required for said zener diode to absorb voltage fluctuations to stabilize a voltage of the boosted DC output, andwherein an output of said auxiliary coil is introduced to said switching element to perform a switching operation in said switching element.