Driver circuit for switching on lamp with low cold resistance

Details Driver circuit for switching on lamp with low cold resistance Driver circuit for switching on lamp with low cold resistance

1989-05-05

1991-01-15

Stephan, Steven L.

Electric power conversion systems

Current conversion

With starting arrangement

323315, 315291, 315310, 363 20, 363 55, H02M 742, H02H 7122

Patent

active

049858203

ABSTRACT:
A driver circuit for switching on lamps with low cold resistance. The circuit includes a power transistor (T5) of which the collector-emitter path is connected to the lamp (12) in a series circuit which lies between a positive terminal and a ground terminal of a supply voltage source. The circuit further includes an RC member comprising a resistor (R1) which is connected on one side to the ground terminal and a capacitor (C) which is connected in series with the resistor and on one side to the positive terminal of the supply voltage source. A comparator (38) compares the voltage at the resistor (R1) with the voltage at the collector of the power transistor (T5) and furnishes at an output a blocking signal for the power transistor (T5) when the voltage at the resistor (R1) is more negative than the voltage at the collector. A limiting member (T4) limits the voltage at the resistor (R1) to a voltage value lying above the saturation voltage of the power transistor (T5).

REFERENCES:
patent: 3204175 (1965-08-01), Kuriger
patent: 4423478 (1983-12-01), Bullock et al.
patent: 4503365 (1985-03-01), Kirk
patent: 4563733 (1986-01-01), Schlenk
patent: 4617496 (1986-10-01), Samodovitz
patent: 4644229 (1987-02-01), Masaki
patent: 4818953 (1989-04-01), Feldstein
patent: 4819117 (1989-04-01), Brennan et al.

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