Battery feed circuit

Details Battery feed circuit Battery feed circuit

1981-06-08

1983-02-08

Schreyer, Stafford D.

179170NC, 179 16F, 179 81R, H04M 1900

Patent

active

043731180

ABSTRACT:
Electronic battery feed circuits are connected across the communication pair, in parallel with the voice transformer, and serve as a dc path for loop current. These electronic battery feed circuits must provide both a low dc impedance to sink loop current and a high ac impedance so as not to shunt the ac signal away from the transformer. Prior art electronic battery feed circuits draw their bias current directly from the communication pair and this configuration tends to unbalance the line, provide too low an ac impedance, and provide too high a dc impedance. The subject electronic battery feed circuit obtains a low level bias current from the voice transformer and presents a low dc impedance to loop current. This particular circuit configuration eliminates hybrid balance problems and ac shunting of the voice transformer.

REFERENCES:
patent: 3789803 (1974-02-01), Davis et al.
patent: 4039766 (1977-08-01), Picandet

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