Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1999-09-29
2000-08-22
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 19, H02M 3335
Patent
active
061082163
ABSTRACT:
A non-contact electrical power transmission system is capable of providing a large supply current of uniform level at an optimum transmission efficiency. The system includes a power circuit including a power supply of providing a high frequency voltage across a power winding, and a load circuit for energizing a load. The load circuit is composed of a secondary winding, a matching capacitor, a rectifier, and a choke coil. The secondary winding is magnetically coupled to the power winding so as to generate an induced high frequency voltage and to provide a leakage inductance to the load circuit. The matching capacitor is connected across the secondary winding to be cooperative with the leakage inductance and with the secondary winding to form an oscillatory circuit which provides an oscillating voltage across the matching capacitor for generating a supply current being fed through the rectifier and the choke coil to the load. The matching capacitor is selected to have a specific capacitance such that the oscillating voltage reaches its extreme each time the inducted high frequency voltage reverses its polarity. The choke coil is connected in circuit to smoothen the supply current. Thus, the supply current of uniform level can be fed to the load, reducing a possibility of incurring a noise on the supply current, yet minimizing an impedance between the supply circuit and the load circuit for realizing an optimum efficiency of converting the high frequency voltage into the supply current.
REFERENCES:
patent: 5638260 (1997-06-01), Bees
patent: 5886516 (1999-03-01), Barrett
Hideaki Abe, et al. "A Non-Contact Charger Using a Resonant Converter with Parallel Capacitor of the Secondary Coil", IEEE, 1998, pp. 136-141. no month.
Abe Hideaki
Harada Kosuke
Sakamoto Hiroshi
Matsushita Electric & Works Ltd.
Riley Shawn
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