Fault detector and interrupt circuit useful in a television sign

Details Fault detector and interrupt circuit useful in a television sign Fault detector and interrupt circuit useful in a television sign

1974-12-30

1976-07-20

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

321 47, 315127, H02M 108, H02M 700

Patent

active

039709159

ABSTRACT:
A supply voltage for signal processing circuits of a television signal processing system is developed in the secondary circuit of a transformer. AC power is coupled to the primary of the transformer through a circuit breaker whose operation is controlled in response to the supply voltage. The circuit breaker includes a normally nonconductive (i.e., high impedance) path which is rendered conductive (i.e., low impedance) with the development of the appropriate supply voltage and rendered nonconductive when the supply voltage falls below a predetermined threshold. A normally conductive (i.e., low impedance) path is coupled across the normally nonconductive path and is rendered nonconductive (i.e., high impedance) as current flows through it. The circuit breaker is particularly useful when the transformer is of the ferroresonant type, since the primary current of a ferroresonant transformer remains substantially constant with changes in the secondary current even under fault conditions.
In an illustrative embodiment the circuit breaker includes a second normally nonconductive path whose conduction is also controlled in response to development of the supply voltage. One portion of the signal processing system is coupled to the supply voltage through the second normally nonconductive path, while another portion is directly coupled to the supply voltage to inhibit lockup conditions arising from the interaction of these portions.

REFERENCES:
patent: 2619525 (1952-11-01), Webb
patent: 3419807 (1968-12-01), Hursh et al.
patent: 3783335 (1974-01-01), Gries

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