Power supply circuit

Details Power supply circuit Power supply circuit

1998-11-13

2000-05-09

Riley, Shawn

Electricity: power supply or regulation systems

Output level responsive

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

G05F 140

Patent

active

060608692

ABSTRACT:
A power supply circuit for supplying power which may be used to drive a liquid crystal display unit in a multiline addressing scheme, in which drive voltages VH, VL and Vi on the common side of the liquid crystal display unit can satisfy the relationship VH-Vi=Vi-Vt with high accuracy, comprises a switching regulator for generating a first output voltage of a first polarity, a resistor connected to the first switching regulator to divide the first output voltage and produce a divided output voltage, and a second, constant-voltage power supply circuit which includes an error amplifier that inputs the divided output voltage as one of a supply voltage and a reference voltage and which generates a second output voltage opposite in polarity to the first polarity so that a constant relationship is maintained between the first and second output voltages.

REFERENCES:
patent: 4626766 (1986-12-01), Musil
patent: 5412308 (1995-05-01), Brown

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