Electricity: power supply or regulation systems – Including an impedance – In a bridge
Patent
1983-10-21
1985-07-16
Wong, Peter S.
Electricity: power supply or regulation systems
Including an impedance
In a bridge
324106, 73204, G01F 158
Patent
active
045300445
ABSTRACT:
A self-balancing DC-substitution measuring system includes a temperature dependant resistor (TDR) which is placed in one leg of a Wheatstone Bridge circuit, diagonally opposed first and second nodes of the bridge being driven respectively by the outputs of two operational amplifiers such that the potential at each of these first and second nodes, when measured with respect to a common reference point is equal in magnitude and opposite in polarity to the other. Each of the amplifiers has a pair of differential inputs and each of these inputs are connected to either of the remaining third and fourth nodes of the bridge circuit or to the common reference point, no two inputs from the same amplifier being connected to the same point and each of the third and fourth nodes and the common reference point having at least one amplifier input connected to it. The arrangement of the connections to the amplifier inputs is such that the third and fourth nodes of the bridge are kept at a potential substantially equal to that at the reference point and the amplifiers are prevented from saturating. Variations in the resistance of the TDR in this circuit, will result in an inbalance in the bridge which in turn causes a change in the potential applied to the first and second nodes of the bridge by the respective amplifiers. The change in potential at the first and second nodes will in turn cause a change in the current flowing through the TDR thereby changing the power being dissipated by the TDR and ultimately changing the temperature of the TDR, and its resistance, such that the bridge is again balanced.
REFERENCES:
patent: 2997652 (1961-08-01), Engen
patent: 3597676 (1971-08-01), Moore
patent: 3611130 (1971-10-01), Larsen et al.
patent: 4008610 (1985-01-01), Larsen et al.
N. T. Larsen, A New Self-balancing DC-Substitution RF Power Meter, Dec. 1976.
Jones Judson H.
Unisearch Limited
Wong Peter S.
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