A VOLTAGE SELECTIVE NONLINEAR BRIDGE

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Abstract
The important property of the simple series resonance circuit employing resistance, capacitance and an iron core reactor arranged to saturate is the abrupt increase in current at a certain critical voltage. This phenomenon is identified as a quasi‐resonant condition, and is compared to resonance in linear circuits. An experimental study is made of a nonlinear bridge circuit comprising two branches of the above type. This bridge is voltage selective in such a manner that the load is only energized thru a certain range (of the supply voltage), which may be small. The variation of bridge output voltage (effective) with bridge supply voltage may be critical. In one case it is observed that 1/100 percent change in supply voltage changes the output (load) voltage by 100 percent. The properties of the bridge circuit are applied to the problem of voltage selective relays which permit the control of many circuits by means of a two wire system. For a bridge comprising identical capacitance and inductance units, but dissimilar resistance, a constant voltage characteristic is noted.

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