ELECTRONIC CONTROL METHOD FOR A PLANAR INDUCTIVE BATTERY CHARGING APPARATUS
First Claim
1. A planar battery charging system comprising;
- a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and
a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when a said secondary winding is placed on said charging surface;
wherein a said primary winding is energized by a control circuit comprising a first-stage power converter and a second-stage power inverter, wherein the first-stage power converter provides a variable DC-link voltage, and wherein the second-stage power inverter generates a fixed-frequency constant AC current to said primary winding.
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Abstract
This invention provides an electronic control method for a planar inductive battery charging apparatus on which one or more electronic loads such as mobile phones, MP3 players etc can be placed and charged simultaneously. The power control circuit of the charging pad consists of two power conversion stages. Depending on the nature of the input power supply, the first power stage is an AC-DC power converter with variable output voltage control and a second stage is a DC-AC power inverter with constant current control. The combination of the two stages provides power control of the charging pad and generates AC magnetic flux of ideally constant magnitude over the charging areas within a group of primary windings that are excited.
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Citations
12 Claims
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1. A planar battery charging system comprising;
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a primary power transmission side formed of an array of primary windings adapted to generate magnetic flux substantially perpendicular to a charging surface; and a secondary power receiving side comprising a secondary winding associated with a battery to be charged and being adapted to receive said magnetic flux when a said secondary winding is placed on said charging surface; wherein a said primary winding is energized by a control circuit comprising a first-stage power converter and a second-stage power inverter, wherein the first-stage power converter provides a variable DC-link voltage, and wherein the second-stage power inverter generates a fixed-frequency constant AC current to said primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification