Short-circuit protected switched output circuit

Details Short-circuit protected switched output circuit Short-circuit protected switched output circuit

1989-08-03

1990-12-11

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361101, 361 57, H02H 308

Patent

active

049774778

ABSTRACT:
A short-circuit protected switched output circuit having: an input node (I10) for receiving an input switching signal; an output node (O10) for outputting a switched output signal; switch means (Q10) connected between the input and output nodes; and a Schmitt trigger NAND gate oscillator arrangement (C10, D11, D12, NG10, R12, R13, R14) having an input coupled to the output node and having an output coupled via diode means to the input node, whereby the oscillator arrangement produces a low frequency, low duty-cycle, fixed-frequency signal at the output node in the event of the output node being short-circuited. An alternative circuit using a Schmitt trigger inverter are also disclosed.

REFERENCES:
patent: 4750079 (1988-06-01), Foy et al.
patent: 4849850 (1989-07-01), Brahms

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