Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-02-24
1999-04-20
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, 307 44, 307 97, H02M 3335, H02J 110, H01H 3134
Patent
active
058962786
ABSTRACT:
A non-contact electric power transmission apparatus including a power supply unit and a load unit. The power supply unit has a first oscillation circuit, a signal secondary winding, a filter circuit, and a driving control circuit. The load unit has a power secondary winding, a signal primary winding, and a second oscillation circuit. The first oscillation circuit has a power primary winding and intermittently oscillates at a first oscillation frequency. When the load unit is placed at a predetermined position with respect to the power supply unit, since signals are induced in the power secondary winding by the signals in the power primary winding, the second oscillation circuit oscillates at a second oscillation frequency which is different from the first oscillation frequency. The signals from the second oscillation circuit are transmitted from the signal primary winding to the signal secondary winding. When the signals having the second oscillation frequency is input from the signal secondary winding to the driving control circuit through the filter circuit, the driving control circuit controls the first oscillation circuit to successively oscillates.
REFERENCES:
patent: 3925772 (1975-12-01), Miller et al.
patent: 4187536 (1980-02-01), Govaert et al.
patent: 4318008 (1982-03-01), Nall
Katsura Yoshinori
Tamura Hideki
Yamashita Mikihiro
Matsushita Electric & Works Ltd.
Patel Rajnikant B.
Wong Peter S.
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