Soft start solid state switch

Details Soft start solid state switch Soft start solid state switch

1988-03-17

1991-05-14

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Discharge control discharge device in the supply circuit

315307, 315311, 315DIG7, 330134, H05B 3700, G05F 100, H01D 512

Patent

active

050159216

ABSTRACT:
The junction temperature rise of a power MOSFET serially connected to a lamp whose resistance nonlinearly increases during turn-on is moderated by the use of control circuitry which initially sets up a relatively low essentially constant current flow through the lamp and transistor and then automatically after the lamp resistance reaches a preselected level, the lamp is allowed to draw significantly more current. The size and therefore cost of the power MOSFET is reduced significantly because the magnitude of the current spike generated by turning on the lamp is significantly reduced the use of the novel control circuitry.

REFERENCES:
patent: 3441866 (1967-05-01), Barber et al.
patent: 3898516 (1975-08-01), Nakasone
patent: 3938000 (1976-02-01), Higashicle
patent: 4009385 (1977-02-01), Sell
patent: 4115828 (1978-09-01), Rowe et al.
patent: 4395661 (1983-07-01), Becker
patent: 4417183 (1983-11-01), Popard et al.
patent: 4486070 (1968-04-01), Engel
patent: 4855647 (1989-08-01), Schaller et al.
patent: 4855649 (1989-08-01), Masaki

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