Start-up circuit for negative inductance multiplier

Details Start-up circuit for negative inductance multiplier Start-up circuit for negative inductance multiplier

1982-10-26

1984-08-21

Wong, Peter S.

Electricity: power supply or regulation systems

Including a transformer or an inductor

With compensation

323901, 179170G, H01F 2742, H01F 4014

Patent

active

044672691

ABSTRACT:
A circuit for increasing the inductance of a transformer as used in a telephone line circuit. An operational amplifier with appropriate feedback is connected across a separate winding of the transformer to provide the reactive inductance. To compensate for changes in resistance of the winding, a field effect transistor is controlled by the same amplifier output to provide a positive resistance in the feedback path and thus maintain balance. An operational amplifier and diode are arranged to cooperate with the negative inductor to prevent lock-up.

REFERENCES:
patent: 3684975 (1972-08-01), Valfre
patent: 3881149 (1975-04-01), Kiko
patent: 4027118 (1977-05-01), Poppe
patent: 4096363 (1978-06-01), Earp
G. Orengo & M. Ferry, "DC Flux Compensating Circuit for Reducing the Size of Transformers", IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 223-224.

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