Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1984-10-01
1985-10-01
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
330207P, 330298, 361 89, 361 86, H02H 308
Patent
active
045449813
ABSTRACT:
A general purpose, short circuit protector/controller circuit for drivers and amplifiers which is external to the internal circuit of the driver amplifier, which is arranged to drive a load such as electronic instrumentation. In this circuit, current sensing resistors are placed in both the positive and negative power supply input lines to the amplifier, and the voltage across each of the current sensing resistors is monitored independently for an overload condition. The voltage across each current sensing resistor is proportional to the current therethrough which drives the load, and is compared to a reference voltage, which is an equivalent representation of an overload or short circuit limit. When the sensed voltage across either resistor is greater than the reference voltage, the amplifier is tri-stated (disconnected from the load). In the preferred embodiment the amplifier is tri-stated for a period T.sub.OFF, protecting the amplifier, and is subsequently reconnected to the load for a period T.sub.ON. If the current limit violation persists, the above cycle is repeated.
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Eisenzopf Reinhard J.
Harris Corporation
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