Voltage booster circuit having back-up circuit and battery...

Details Voltage booster circuit having back-up circuit and battery... Voltage booster circuit having back-up circuit and battery...

2006-03-07

2006-03-07

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S283000

Reexamination Certificate

active

07009368

ABSTRACT:
In a voltage booster circuit, a switching transistor turns on and off a flow of an electric current in a booster coil thereby to boost a voltage supplied form a d.c. power source. A back-up circuit is connected to the booster coil to store the boosted voltage as an output voltage. A current detection circuit detects an electric current flowing in the switching transistor and turns off the switching transistor, when the detected current reaches a predetermined level. An off-period control circuit variably controls an off-period of the switching transistor after the switching transistor is turned off. The off-period control circuit varies the off-period in accordance with a voltage difference between the output voltage and an upper limit threshold voltage. The off-period of the switching transistor is increased as the output voltage increases toward the upper limit threshold voltage

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patent: 6222746 (2001-04-01), Kim
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“DC-to-DC Converter Control Circuits—Semiconductor Technical Data” MC34063A, MC33063A,Motorola Analog IC Device Data, Motorola, Inc., 1996 pp. 1-12.

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