Device for protecting a ballast circuit from excess voltage

Details Device for protecting a ballast circuit from excess voltage Device for protecting a ballast circuit from excess voltage

1994-07-26

1995-09-19

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315224, 315291, 315209R, 361 15, 361 18, 363 37, H05B 3702

Patent

active

054518458

ABSTRACT:
A device for protecting a ballast circuit from excess voltage and excess current includes a switch for disconnecting the ballast circuit from the power source and a control circuit for operating this switch; the control circuit monitoring a control point, from which control point a first resistor connects to a first terminal of the power source, a second resistor connects to a second terminal of the power source, and a third resistor connects to a point between the switch and the ballast, the switch being brought into off-state when the voltage between the control point and the first terminal of the power source exceeds a given value, thus leading to a hysteresis between an input voltage for switching the device off and an input voltage for switching the device back on again, with positive feedback being provided by the third resistor for decreasing the switch-off time and the corresponding switching losses.

REFERENCES:
patent: 4441053 (1984-04-01), Daspit
patent: 4710682 (1987-12-01), Zuchtriegel
patent: 4891728 (1990-01-01), Preis et al.
patent: 4935836 (1990-06-01), Labbus et al.
patent: 4996464 (1991-02-01), Dodd et al.
patent: 5032968 (1991-07-01), Mikami et al.
patent: 5313145 (1994-05-01), Francis, Jr. et al.

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