Boost power supply with clock period compensation

Details Boost power supply with clock period compensation Boost power supply with clock period compensation

1995-08-24

1997-03-11

Krishnan, Aditya

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

363 89, G05F 146

Patent

active

056105029

ABSTRACT:
A boost supply has an inductor coupled to supply voltage and connected to ground through a charging switch and connected through a diode to charge a storage capacitor when the switch is open to attain a boost voltage higher than supply voltage. A clock for controlling the switch operation is an astable circuit having an operational amplifier with an RC timing feedback to one input and a hysteresis feedback to the other input. The hysteresis circuit includes a resistor coupled at one end to a reference voltage and through a diode to the amplifier output. This circuit has an increasing frequency with increasing supply voltage to reduce switch closed time and limit the increase of inductor current to safe levels.

REFERENCES:
patent: 5001620 (1991-03-01), Smith

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