Heating resistor driving circuit which suppresses current spikes

Details Heating resistor driving circuit which suppresses current spikes Heating resistor driving circuit which suppresses current spikes

1989-04-20

1990-05-29

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219209, 219497, 361101, 361111, 307117, H05B 102

Patent

active

049298151

ABSTRACT:
A heating resistor drive circuit includes a first switching transistor, connected in series to the resistor, for connecting and cutting off a current flow supplied from a power source to the heating resistor, and a second switching transistor connected in series to the base of the first transistor. The second transistor is turned on in response to an actuation signal. The drive circuit further includes a suppressing circuit for raising gradually a base current for the first transistor up to a predetermined level while the second transistor is conductive, so as to suppress a current spike flowing through the heating resistor.

REFERENCES:
patent: 3819952 (1974-06-01), Enomoto et al.
patent: 3838248 (1974-09-01), Uchida et al.
patent: 3962559 (1976-06-01), Drda et al.
patent: 4057844 (1977-11-01), Smedley
patent: 4449032 (1984-05-01), Frerking
patent: 4484244 (1984-11-01), Avery
patent: 4678950 (1987-07-01), Mitake
patent: 4712152 (1987-12-01), Iio

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