Pulse transformer circuit for isolating electrical signals

Details Pulse transformer circuit for isolating electrical signals Pulse transformer circuit for isolating electrical signals

1993-08-12

1996-03-12

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 64, 323902, H02M 3335

Patent

active

054991765

ABSTRACT:
A signal isolator circuit employing a pulse transformer overcomes the disadvantages of both prior art opto-coupler and pulse transformer signal isolator circuits by employing an active signal retrieval circuit which, in a higher accuracy configuration, repetitively performs the following steps on the electrical side of the pulse transformer where the signal information is required: 1) drives a current pulse into the pulse transformer; 2) samples or detects the voltage across the pulse transformer after it has been stabilized; 3) holds or stores the sampled voltage for a full cycle of operation; and, if necessary, 4) filters the sampled signal. On the other electrical side of the pulse transformer, the retrieval circuitry is configured such that when the pulse transformer is being driven by the current pulse, the voltage will be clamped by the source signal reset. In a lower accuracy configuration, the signal retrieval circuit of the present invention performs the same steps set forth above with the exception that, rather than sampling the voltage across the pulse transformer, the reflected impedance is detected as being either high or low, by some quantitative measure, and the detector output will be set to either a high or low voltage corresponding to the detected impedance.

REFERENCES:
patent: 4862339 (1989-08-01), Inou et al.
patent: 4885673 (1989-12-01), Philippe
patent: 4926303 (1990-05-01), Sturgeon

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