Circuitry for supplying DC power to a small-size electronic appa

Details Circuitry for supplying DC power to a small-size electronic appa Circuitry for supplying DC power to a small-size electronic appa

1996-09-26

1998-04-28

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323222, 323290, G05F 140

Patent

active

057449430

ABSTRACT:
A chopper-type switching power-supply circuit having a DC high-potential input terminal, a DC low-potential input terminal, a DC high-potential output terminal, and a DC low-potential output terminal. The power-supply circuit has one terminal of an inductor connected to the DC high-potential input terminal and a capacitor connected to other terminal of the inductor. The output circuit contains the DC high-potential output terminal and the DC low-potential output terminal. A first input terminal is coupled to the other end of the capacitor and a second input terminal coupled to the DC low-potential input terminal. An N-channel MOSFET has a drain electrode connected to the other terminal of the inductor and a source electrode connected to the high-potential output terminal. A control circuit supplies a pulse-width control signal to the gate electrode of the N-channel MOSFET in accordance with the potential at the output terminals of the output circuits, thereby to perform negative feedback chopper control on the N-channel MOSFET.

REFERENCES:
patent: 4760324 (1988-07-01), Underhill
patent: 4961128 (1990-10-01), Bloom
patent: 5109186 (1992-04-01), Lieu
patent: 5257170 (1993-10-01), Sprvijt

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