Short-circuit protection device for a DC control element

Details Short-circuit protection device for a DC control element Short-circuit protection device for a DC control element

1982-03-05

1984-03-27

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 94, 361 31, 363 55, 363 56, 363 58, 363 50, H02H 308, H02H 720, H02H 710

Patent

active

044398069

ABSTRACT:
A short-circuit protection device for a DC control element has at least one transistor which is addressed by timing pulses obtained by comparison of a triangular voltage with a control voltage. Each such transistor is provided with a separate overcurrent protection device which, after a short circuit, blocks the associated transistor until the beginning of a new switching-on pulse. The control voltage assumes values which are above the maximum value of the triangular voltage.
In the event of a short circuit, the transistor concerned is switched off very fast, but is switched on again by the next succeeding switching-on pulse and a determination is made as to whether the short circuit is still present. If the control voltage rises to values which are above the maximum value of the triangular voltage because the actual value of the load current deviates heavily from the reference value due to the disconnection of the transistors, the transistors remain switched off until the DC control element is restored to operation by external intervention.

REFERENCES:
patent: 3976919 (1976-08-01), Vandevier et al.
patent: 4017781 (1977-04-01), Muller
patent: 4047235 (1977-09-01), Davis
patent: 4290000 (1981-09-01), Sun

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