Power-factor-corrected single-stage inductive charger
First Claim
1. An inductive charger system comprising:
- an AC line rectifier;
a filter capacitor coupled across the line rectifier;
an inverter coupled to the line rectifier and the filter capacitor;
a series resonant tank circuit coupled to the inverter;
a charge coupler and inductive inlet comprising a transformer and a parallel resonant tank circuit for coupling energy to a load;
a controller for regulating power supplied to the load by increasing the operating frequency of the system to reduce output current for a given voltage;
wherein the parallel resonant tank circuit comprises a parallel inductance and a parallel capacitor, andwherein the parallel inductance and parallel filter capacitor are disposed in the inductive inlet.
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Accused Products
Abstract
The present invention comprises a power-factor-corrected, single-stage inductive charger that may be used to charge a load, such as batteries of an electric vehicle. The inductive charger system is a single stage inductive charger compatible with the Society of Automotive Engineers inductive charging standard SAE J-1773. The single stage power processing provided by the inductive charger system includes both power factor correction and output power regulation using a relatively low parts count. The inductive charger system is fully soft switched over the line voltage and power range, resulting in high efficiency. The inductive charger system uses the current source operation of a series-parallel resonant converter feeding the SAE J- 1773 interface to provide voltage gain for power factor correction over the full AC line cycle. The operating frequency of the converter is modulated around the current-source frequency to regulate the output power from zero to full load.
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Citations
12 Claims
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1. An inductive charger system comprising:
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an AC line rectifier; a filter capacitor coupled across the line rectifier; an inverter coupled to the line rectifier and the filter capacitor; a series resonant tank circuit coupled to the inverter; a charge coupler and inductive inlet comprising a transformer and a parallel resonant tank circuit for coupling energy to a load; a controller for regulating power supplied to the load by increasing the operating frequency of the system to reduce output current for a given voltage; wherein the parallel resonant tank circuit comprises a parallel inductance and a parallel capacitor, and wherein the parallel inductance and parallel filter capacitor are disposed in the inductive inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An inductive charger system for a vehicle comprising:
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an AC line rectifier; a filter capacitor coupled across the line rectifier; an inverter coupled to the line rectifier and the filter capacitor; a series resonant tank circuit coupled to the inverter; a charge coupler and inductive inlet for coupling power to the vehicle comprising a transformer and a parallel resonant tank circuit; and a controller for regulating power supplied to the vehicle by increasing the operating frequency of the system to reduce output current for a given voltage. - View Dependent Claims (10)
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11. An inductive charger system for a vehicle comprising:
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a first charging circuit comprising; an AC line rectifier; a filter capacitor coupled across the line rectifier; an inverter coupled to the line rectifier and the filter capacitor; a series resonant tank circuit coupled to the inverter; a second charging circuit located in the vehicle that electromagnetically couples to said first charging circuit to transfer electrical energy from said first charging circuit to said second charging circuit using a charge coupler and inductive inlet comprising a transformer and a parallel resonant tank circuit; and a controller for regulating power supplied to the load by increasing the operating frequency of the system to reduce output current for a given voltage. - View Dependent Claims (12)
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Specification