Signal conditioning circuit

Details Signal conditioning circuit Signal conditioning circuit

1986-09-30

1989-01-10

Envall, Jr., Roy N.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 87, H02H 308, H02H 320

Patent

active

047977744

ABSTRACT:
A signal conditioning circuit including power terminals adapted to be connected to a direct current power source, sensor terminals adapted to receive a direct current signal from at least one electrical sensing device and output terminals adapted to be connected to an electrical resistance. The conditioning circuit includes an inverter connected to the power terminals for generating an output signal of opposite polarity to the signal received at the power terminals. An adjustment mechanism is connected to the output terminals for receiving the inverter output signal and adjusting the magnitude of the signal received at the sensor terminals to a desired level. In a second mode of operation, the circuit includes a second set of sensor terminals and the adjustment mechanism operates to deliver an output signal proportional to the difference between the signals received at both the first and second sensor terminals.

REFERENCES:
patent: 4278940 (1981-07-01), Milkovic
patent: 4346332 (1982-08-01), Walden
patent: 4453193 (1984-06-01), Huang et al.
patent: 4475151 (1984-10-01), Philipp

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