Battery charging system for electric vehicles
First Claim
1. A battery charging system comprising:
- a main battery for driving a vehicle;
an auxiliary battery for driving an auxiliary device of the vehicle, the battery charging system charging the main battery and the auxiliary battery when a supply of electric power is received from a commercial AC power source;
a rectification circuit for rectifying electric power from the commercial AC power source;
a converter for converting the rectified electric power to AC input power;
a transformer to transform the AC input power, the transformer including an output winding having a first part to output first AC power and a second part to output second AC power;
a first output part, connected to the first part of the output winding of the transformer, to rectify the first AC power and to supply the first AC power to the main battery; and
a second output part, connected to the second part of the output winding of the transformer, to rectify the second AC power and to supply the second AC power to the auxiliary battery; and
a converting Circuit, included in the first output part, to convert, when the battery charging system does not receive the electric power from the commercial AC power source, electric power of the main battery to the second AC power to provide electric power from the main battery to the auxiliary battery through the first part and the second part of the output winding.
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Accused Products
Abstract
A battery charger includes a primary side circuit, a transformer, a secondary side circuit and a control circuit. The secondary side circuit includes a first output unit and a second output unit. The battery charges a main battery and an auxiliary battery. The first output unit, which is connected to a main battery, includes an integrated rectifier-converter and a smoothing circuit. The integrated rectifier-converter is formed using MOSFETs. When charging the auxiliary battery with power from the main battery, power from the main battery is converted by the integrated rectifier-converter to AC power which induces power in an output winding of a transformer connected to the auxiliary battery.
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Citations
23 Claims
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1. A battery charging system comprising:
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a main battery for driving a vehicle; an auxiliary battery for driving an auxiliary device of the vehicle, the battery charging system charging the main battery and the auxiliary battery when a supply of electric power is received from a commercial AC power source; a rectification circuit for rectifying electric power from the commercial AC power source; a converter for converting the rectified electric power to AC input power; a transformer to transform the AC input power, the transformer including an output winding having a first part to output first AC power and a second part to output second AC power; a first output part, connected to the first part of the output winding of the transformer, to rectify the first AC power and to supply the first AC power to the main battery; and a second output part, connected to the second part of the output winding of the transformer, to rectify the second AC power and to supply the second AC power to the auxiliary battery; and a converting Circuit, included in the first output part, to convert, when the battery charging system does not receive the electric power from the commercial AC power source, electric power of the main battery to the second AC power to provide electric power from the main battery to the auxiliary battery through the first part and the second part of the output winding.
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2. A battery charging system for an electric vehicle, the battery charging system comprising:
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a rectification circuit for rectifying electric power from a commercial AC power source; a DC/AC converter for converting the rectified electric power into AC input power; a transformer for stepping up/down an output from the DC/AC converter, the transformer including a first output winding and a second output winding; a first output part, connected to the first output winding, comprised of a rectifying device which rectifies a first output voltage of the first output winding by allowing current to flow bidirectionally therethrough, the first output part outputting the rectified first output voltage of the first output winding to a main battery of the electric vehicle when electric power is supplied from the commercial AC power source, and, when the battery charging system does not receive the electric power from the commercial AC power source, the first output part converting DC voltage of the main battery to regenerated AC voltage and applying the regenerated AC voltage to the first output winding to induce a second output voltage in the second output winding; and a second output part, connected to the second output winding, to rectify the second output voltage and output the second output voltage to the auxiliary battery for driving an auxiliary electric load. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 17, 18, 19, 20, 21, 22)
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11. A battery charging system for an electric vehicle comprising:
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an inductive coupler provided with a primary coil and a secondary coil separable from each other for stepping up/down voltage supplied to the primary coil and outputting the same to a secondary coil side; a first output part comprised of a bidirectional device which can bidirectionally flow current for rectifying an output voltage of a first part of the secondary coil of the inductive coupler and outputting the same to the main battery for driving the vehicle when electric power is supplied to the primary coil of the inductive coupler, and performing high-frequency AC conversion when the auxiliary battery is charged with an input of electric power from the main battery; and a second output part for rectifying an output voltage of a second part of the secondary coil of the inductive coupler and outputting the same to an auxiliary battery for driving an auxiliary electric load. - View Dependent Claims (12, 13, 14, 15, 16)
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23. A battery charging system comprising:
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a transformer having a primary winding on a primary side and a first secondary winding and a second secondary winding on a secondary side; a first rectification circuit, connected to a connection for a commercial AC power source, to convert commercial AC power to a DC voltage; a DC/AC converter, connected to the primary winding of the transformer, to convert the DC voltage to AC input power; a rectification/converting device, connected to the first secondary winding of the transformer, to rectify AC voltage across the first secondary winding, when electric power is supplied from the commercial AC power source, to charge a main battery, and to convert DC voltage from the main battery to regenerated AC power, when the battery charging system does not receive the electric power from the commercial AC power source, and applying the regenerated AC voltage to the first secondary winding of the transformer to induce a second AC voltage in the second secondary winding; and a second rectification device, connected to the second secondary winding, to rectify the second AC voltage across the second secondary winding and to output the rectified second AC voltage to the auxiliary battery.
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Specification