Soft start solid state switch

Details Soft start solid state switch Soft start solid state switch

H - Electricity

05

B

318/120, 323/4,

H05B 39/02 (2006.01)

Patent

CA 1314070

GE-28SP1387 Abstract of the Invention 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 by the use of the novel control circuitry.

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