Battery charger for electric vehicles
First Claim
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1. A battery charger for electric vehicles, the battery charger comprising:
- at least one converter unit composed of three converter modules and having a power supply circuit configured to be switched between a three-phase supply mode and a single-phase supply mode;
wherein the power supply circuit comprises three first bridge circuits by which, in the three-phase supply mode, input sides of the converter modules are connected phase-against-phase in a triangular configuration, and three second bridge circuits by which, in the single phase mode, the input sides of the converter modules are connected phase-against-ground in a star configuration;
wherein the converter modules comprise identical current controlled DC-DC converter modules having reverse current protected outputs connected in parallel to a charge terminal of a vehicle battery.
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Abstract
A battery charger for electric vehicles includes at least three identical current controlled AC-DC converter modules having reverse current protected outputs connected in parallel to a charge terminal of the battery.
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Citations
22 Claims
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1. A battery charger for electric vehicles, the battery charger comprising:
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at least one converter unit composed of three converter modules and having a power supply circuit configured to be switched between a three-phase supply mode and a single-phase supply mode; wherein the power supply circuit comprises three first bridge circuits by which, in the three-phase supply mode, input sides of the converter modules are connected phase-against-phase in a triangular configuration, and three second bridge circuits by which, in the single phase mode, the input sides of the converter modules are connected phase-against-ground in a star configuration; wherein the converter modules comprise identical current controlled DC-DC converter modules having reverse current protected outputs connected in parallel to a charge terminal of a vehicle battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A battery charger for electric vehicles, the battery charger comprising:
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at least three identical current controlled AC-DC converter modules having reverse current protected outputs connected in parallel to a charge terminal of a vehicle battery; wherein the converter modules are configured as resonant converters; a controller configured to individually control output currents of the converter modules in accordance with a variable demand signal such that a current demand is met with the smallest possible number of active converter modules, with as many converter modules as possible operating at full power; wherein each of the converter modules has at least two different modes of operation which cover different ranges of output currents; wherein the converter modules comprise a power supply circuit configured to be switched between a three-phase supply mode and a single-phase supply mode; wherein the power supply circuit comprises three first bridge circuits by which, in the three-phase supply mode, input sides of the converter modules are connected phase-against-phase in a triangular configuration, and three second bridge circuits by which, in the single phase mode, the input sides of the converter modules are connected phase-against-ground in a star configuration; and the controller is configured to control the converter modules, in response to a change of the demand signal, such that a step-wise change of the output current caused by switching the mode of operation is compensated by changing a switching frequency of the resonant converter, so that the output current becomes a continuous function of the demand signal.
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Specification