Voltage step-up circuit and its control circuit

Details Voltage step-up circuit and its control circuit Voltage step-up circuit and its control circuit

1997-03-26

1998-08-04

Hecker, Stuart N.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

G05F 110

Patent

active

057899053

ABSTRACT:
This circuit improves power efficiency and reduces number of parts required in a voltage step-up circuit. This circuit includes a switching control circuit and a voltage transformer circuit. The control circuit is a push-pull circuit comprising a constant-current-on type transistor Tr1 and a differential-pulse-on type transistor Tr2. The transformer circuit comprises an NPN type switching transistor Tr3, a coil L1, a diode D1, and a electrolytic capacitor C2. With Tn being the duration of the ON state of Tr3, and Tf the duration of the OFF state, the output voltage is Vcc(Tn+Tf)/Tf. Since the constant-current-on type transistor Tr1 is laid closer to the power source than the differential-pulse-on type transistor Tr2, the switching transistor Tr3 can be driven directly and no PNP type transistor is necessary.

REFERENCES:
patent: 4355277 (1982-10-01), Davis et al.
patent: 4961006 (1990-10-01), Pace et al.
patent: 5321299 (1994-06-01), Ohkawa et al.
patent: 5677617 (1997-10-01), Tokai et al.

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