Soft start solid state switch
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United States of America Patent
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May 14, 1991
Grant Date -
N/A
app pub date -
Mar 17, 1988
filing date -
Mar 17, 1988
priority date (Note) -
Expired
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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.
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