Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-09-08
1994-09-13
Wolfe, Willis R.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307571, 361159, H01H 4700, H03K 1708
Patent
active
053471695
ABSTRACT:
A circuit in which the source-to-drain conduction path of a power switching transistor is connected in series with an inductive load between first and second power terminals includes a voltage transient clamping transistor having its source-to-drain conduction path connected between the drain and gate of the switching transistor. In response to a turn-off signal applied to the gate of the switching transistor, a transient voltage is generated at the drain of the switching transistor. When the transient voltage at the drain of the power switching transistor exceeds a predetermined value, the clamping transistor is turned-on. The conduction of the clamping transistor limits the voltage rise at the drain of the switching transistor and tends to maintain the switching transistor conducting temporarily to aid in the discharge of the energy stored in the inductive load. A unidirectional conducting element connected in series with the clamping transistor ensures that only current of a polarity to discharge the inductive load flows through the clamping transistor.
REFERENCES:
patent: 4581540 (1986-04-01), Guajardo
patent: 4728826 (1988-03-01), Einzinger et al.
patent: 4774624 (1988-09-01), Qualich
patent: 4952827 (1990-08-01), Leipold et al.
patent: 5028811 (1991-07-01), Le Roux et al.
Giordano Raymond L.
Preslar Donald R.
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