Electricity: power supply or regulation systems – External or operator controlled – Using a three or more terminal semiconductive device as the...
Patent
1994-04-06
1997-03-11
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using a three or more terminal semiconductive device as the...
323351, 323272, 327403, 327401, G05F 110
Patent
active
056105070
ABSTRACT:
According to a first aspect of the invention, a power control switch comprises two solid state switching elements (14, 15) in parallel, the second switching element (15) having a higher resistance but faster turn-off time than the first element. In operation the switch is pulse width modulated and the first element is switched off after the second element to establish a guard period, the duration of which is controlled in dependence upon the duty cycle to provide efficient switching. According to a second aspect of the invention a power control switch comprises a switching element (14 or 15) controlled by a field programmable gate array (5) which is preferably programmed by an erasable programmable read only memory (EPROM), thereby providing a reconfigurable control means.
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Casey, Esq. Donald C.
GEC Marconi Ltd.
Riley Shawn
Wong Peter S.
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