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US 6,275,013 B1Granted
Switching power supply employing an internal resistance in series with a zener diode to stabilize a DC output
AssigneeFunai Electric Co., Ltd.
InventorYoshio Higuchi
Life of this patent
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Abstract
A switching power supply includes a rectifying and smoothing circuit 6 coupled to an inductor L1 and a zener diode D2 coupled to the output of the rectifying and smoothing circuit 6. An internal resistor on the inductor L1 side viewed through the rectifying and smoothing circuit 6 is employed as a serial resistor for generating the voltage drop which is required for the zener diode D2 to absorb voltage fluctuation, whereby the voltage of the DC output 22 is stabilized.
Claims6
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;
- and
- a 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, and
- wherein an output of said auxiliary coil is introduced to said switching element to perform a switching operation in said switching element.
6 more elements
Dependencies are inferred from the claim text.