Transistor chopper protection circuit

Details Transistor chopper protection circuit Transistor chopper protection circuit

1980-06-09

1982-12-07

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 88, 361111, 363 20, 363124, 307253, 307240, H02H 720

Patent

active

043630677

ABSTRACT:
A circuit for protecting the transistor of a high current transistor chopper from damage due to inductive energy stored in the chopper circuit when the transistor is biased nonconductive. The inductive energy charges a capacitor connected in parallel with the transistor, and a return circuit returns the energy stored in the capacitor to the source while the transistor is nonconductive and to the load when the transistor is subsequently biased conductive.

REFERENCES:
patent: 3571614 (1971-03-01), Rolstead
patent: 3599077 (1971-08-01), Lohrmann
patent: 3736495 (1973-05-01), Calkin et al.
patent: 4010387 (1977-03-01), Akamatsu
patent: 4052625 (1977-10-01), Cameron
patent: 4268898 (1981-05-01), Brown
"Switching Stress Reduction in Power Transistor Converters", by Undeland, IAS, 1976, Paper 14-B, pp. 383-392, (IAS-Industry Applications Society).

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