Inductance multiplier circuit

Details Inductance multiplier circuit Inductance multiplier circuit

1987-10-22

1988-08-30

Wong, Peter S.

Electricity: power supply or regulation systems

Including a transformer or an inductor

With compensation

379413, H01F 2742

Patent

active

047679808

ABSTRACT:
A circuit for increasing the apparent inductance presented by a transformer to a differential signal. The circuit may be used in a battery feed interface circuit for providing battery power to a subscriber's telephone or in a current sink interface circuit for providing a low impedance DC loop closure toward a telephone line feed circuit while maintaining a high impedance for differential AC signals. In either usage the inductance multiplier circuit always multiplies the primary inductance of the transformer by a factor which is one plus a positive number. The transformer has three windings. The multiplication is accomplished by a current source which provides to the third winding a current which flows therein in a manner so as to oppose the current flowing in that winding due to the voltage induced in that winding when the first and second windings are excited by the differential AC signal.

REFERENCES:
patent: 3714548 (1973-01-01), Macrander
patent: 3881149 (1975-04-01), Kiko
patent: 3959718 (1976-05-01), Hasegawa
patent: 4046967 (1977-09-01), O'Neill
patent: 4064449 (1977-12-01), Macrander
patent: 4241239 (1980-12-01), Pernyeszi
patent: 4463307 (1984-07-01), Kiko et al.
patent: 4503289 (1985-03-01), Spires

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