Battery charging system and method for cableless charging of a battery with voltage and current sensors on both the primary and secondary sides and a DC-DC converter on the primary side involved in an efficiency calibration power loop
First Claim
1. A battery charging system for cablelessly charging a battery, the battery charging system comprising:
- a primary-side charging unit as a primary side;
a secondary-side charging unit as a secondary side;
a transformer having a primary winding as part of said primary side and a secondary winding as part of said secondary side;
a controller on said primary side and a controller on said secondary side;
a voltage sensor on said primary side and a voltage sensor on said secondary side;
a current sensor on said primary side and a current sensor on said secondary side;
a communication unit on said primary side and a communication unit on said secondary side; and
a DC/DC converter disposed only on said primary side and implemented as a component of a single, primary-side power control loop of the battery charging system for solely indirect control of a charging current of the battery, said power control loop having parameters determined by a calibration process periodically carried out during charging of the battery, and said calibration process determining an efficiency of said transformer based on current and voltage values respectively measured by said secondary-side current sensor and said secondary-side voltage sensor;
said calibration process including testing whether at least one measured value is stable without oscillation;
wherein said single, primary-side control loop is configured to indirectly control the charging current of the battery and to be a sole control loop controlling the charging current of the battery.
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Accused Products
Abstract
A battery charging system for cablelessly charging a battery includes a primary-side charging unit as a primary side, a secondary-side charging unit as a secondary side, a transformer having a primary-side winding as part of the primary side and a secondary-side winding as part of the secondary side, one controller on the primary side and one controller on the secondary side, one voltage sensor on the primary side and one voltage sensor on the secondary side, one current sensor on the primary side and one current sensor on the secondary side, one communication unit on the primary side and one communication unit on the secondary side, and one direct current converter provided on the primary side only.
133 Citations
8 Claims
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1. A battery charging system for cablelessly charging a battery, the battery charging system comprising:
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a primary-side charging unit as a primary side; a secondary-side charging unit as a secondary side; a transformer having a primary winding as part of said primary side and a secondary winding as part of said secondary side; a controller on said primary side and a controller on said secondary side; a voltage sensor on said primary side and a voltage sensor on said secondary side; a current sensor on said primary side and a current sensor on said secondary side; a communication unit on said primary side and a communication unit on said secondary side; and a DC/DC converter disposed only on said primary side and implemented as a component of a single, primary-side power control loop of the battery charging system for solely indirect control of a charging current of the battery, said power control loop having parameters determined by a calibration process periodically carried out during charging of the battery, and said calibration process determining an efficiency of said transformer based on current and voltage values respectively measured by said secondary-side current sensor and said secondary-side voltage sensor; said calibration process including testing whether at least one measured value is stable without oscillation; wherein said single, primary-side control loop is configured to indirectly control the charging current of the battery and to be a sole control loop controlling the charging current of the battery. - View Dependent Claims (2, 3, 4, 5)
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6. A method for cablelessly charging a battery by using a split battery charging system, the method comprising the following steps:
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transferring electric power from a primary side of the battery charging system to a secondary side of the battery charging system using a transformer; connecting the battery to be charged to the secondary side of the battery charging system; controlling a charging current of the battery solely indirectly by a single power control loop disposed on the primary side; and periodically carrying out a calibration process during charging of the battery in which efficiency changes of the transformer are detected and compensated by adjusting parameters of the primary-side power control loop, wherein the calibration process includes testing whether at least one measured value is stable without oscillation. - View Dependent Claims (7, 8)
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Specification