Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device
Patent
1993-01-29
1994-11-29
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Utilizing three or more electrode solid-state device
361101, 363 97, 327478, 327438, 327374, H03K 1756
Patent
active
053693086
ABSTRACT:
A power transistor switching circuit includes a switching transistor. A switching signal triggers a control device which, via a delay device and a control amplifier applies a first control signal to a control electrode of the switching transistor. A thyristor is coupled to the control electrode of the switching transistor. The thyristor has a first trigger gate and a second trigger gate. A measuring circuit generates a measuring signal proportional to the current in the switching transistor. A comparison device compares the measuring signal with a reference signal for applying a second trigger signal to the thyristor second trigger gate. The control device includes a further control amplifier having an input coupled to the switching signal and an output which applies a further control signal to the first trigger gate. The delay device delays the first control signal with respect to the further control signal. When the switching transistor is turned on, the further control amplifier and the delay device prevent unwanted triggering of the thyristor due to the high impedance of the signal source which supplies the second trigger signal.
REFERENCES:
patent: 4092710 (1978-05-01), Wadsworth
patent: 4581540 (1986-04-01), Guajardo
patent: 5006949 (1991-04-01), Guajardo
Halberstadt Johan C.
Schoofs Franciscus A. C. M.
Dudek Jim
Franzblau Bernard
Sikes William L.
U.S. Philips Corporation
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