Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-06-04
1988-05-24
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307270, 307300, 307570, 323289, H03K 1760, H03K 301, H03K 17687, G05F 140
Patent
active
047468130
ABSTRACT:
A switching circuit for and inductive load with a parallel freewheeling diode comprises a semiconductor switch in series therewith across a power supply and a switch control effective to change the semiconductor switch from a nonconducting to a conducting state by sourcing current to the control electrode to charge the internal capacitance. The switch control means is responsive to the load voltage to produce a lower current rate to the control electrode while the load voltage indicates a condition other than reverse bias for the freewheeling diode in order to reduce RFI by slowing the switching of the semiconductor switch while the freewheeling diode is recovering and a higher current rate as soon as the load voltage indicates reverse bias for the freewheeling diode in order to minimize time spent in the active conduction region of the semiconductor switch and thus minimize resultant heat generation during switching.
REFERENCES:
patent: 4540893 (1985-09-01), Bloomer
patent: 4594636 (1986-06-01), Hamer et al.
patent: 4709160 (1987-11-01), Kinoshita
Davis B. P.
General Motors Corporation
Miller Stanley D.
Sigler Robert M.
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