Contactless power supply device
First Claim
1. A contactless power supply device comprising:
- an inverter circuit which outputs high-frequency power;
a control circuit which controls the inverter circuit;
a primary winding which is supplied with the high-frequency power from the inverter circuit, to transmit power through electromagnetic induction by resonating with a first capacitor;
a drive voltage detection unit which detects a drive voltage of the inverter circuit;
a drive current detection unit which detects a drive current of the inverter circuit; and
a primary component extraction unit which extracts, from the drive voltage and the drive current, a primary drive voltage and a primary drive current, that is, the first order frequency-components having the same frequency as a drive frequency of the inverter circuit,wherein the primary winding transmits power to a secondary winding which comes into a position opposite to the primary winding through a spatial gap, and the control circuit calculates, on the basis of the primary drive voltage and the primary drive current, magnitude and phase of impedance of an inverter load, andthe control circuit detects how large the spatial gap is created between the primary winding and the secondary winding based on a stored relationship among the spatial gap and parameters of the measured magnitude and phase of impedance of the inverter load.
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Accused Products
Abstract
In order to obtain a contactless power supply device which, even when a spatial gap between a primary winding and a secondary winding varies, is capable of not only accurately detecting whether or not the primary winding and the secondary winding come into the position opposite to each other, but also detecting how large the spatial gap between the primary winding and the secondary winding is created, the contactless power supply device is provided with a drive voltage detection unit which detects the drive voltage of an inverter circuit, a drive current detection unit which detects the drive current of the inverter circuit, and a primary component extraction unit which, from the drive voltage and the drive current, extracts a primary drive voltage and a primary drive current including the first order frequency-components having the same frequency as a drive frequency of the inverter circuit.
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Citations
9 Claims
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1. A contactless power supply device comprising:
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an inverter circuit which outputs high-frequency power; a control circuit which controls the inverter circuit; a primary winding which is supplied with the high-frequency power from the inverter circuit, to transmit power through electromagnetic induction by resonating with a first capacitor; a drive voltage detection unit which detects a drive voltage of the inverter circuit; a drive current detection unit which detects a drive current of the inverter circuit; and a primary component extraction unit which extracts, from the drive voltage and the drive current, a primary drive voltage and a primary drive current, that is, the first order frequency-components having the same frequency as a drive frequency of the inverter circuit, wherein the primary winding transmits power to a secondary winding which comes into a position opposite to the primary winding through a spatial gap, and the control circuit calculates, on the basis of the primary drive voltage and the primary drive current, magnitude and phase of impedance of an inverter load, and the control circuit detects how large the spatial gap is created between the primary winding and the secondary winding based on a stored relationship among the spatial gap and parameters of the measured magnitude and phase of impedance of the inverter load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification