System for contactless energy transfer, use of a system for contactless energy transfer and vehicle with a system for contactless energy transfer between a first vehicle component and a second vehicle component
First Claim
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1. A system for contactless energy transmission, comprising:
- a resonant transformer with a primary winding in a primary core, a secondary winding in a secondary core mechanically not connected to the primary core, and at least one capacitor,a primary control unit,a secondary control unit,a measuring device connected to the secondary winding and to the secondary control unit for acquiring an electrical state variable in the secondary winding,a primary inverter, connected to the primary winding, with variable frequency, anda modulator-demodulator device for transmitting data between the primary control unit and the secondary control unit by way of the transformer,wherein the primary control unit is connected in a controlling manner to the primary inverter, and the primary control unit is configured to change the frequency of the primary inverter when the primary control unit receives a frequency change signal, andthe secondary control unit is configured, depending on the change in the electrical state variable, to transmit a signal for a frequency change in the primary inverter to the primary control unit such that a frequency of a primary voltage present at the primary winding corresponds to a resonance frequency of the resonant transformer during power transmission,wherein the system further comprises a coupling device configured to individually connect one of a plurality of primary inverters selectively to one of a group of primary windings.
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Abstract
A system for contactless energy transmission includes a transformer formed by a primary winding and a secondary winding, which transformer is designed so as to be resonant as a result of capacitors. By measuring and comparing electrical state variables on the primary side and on the secondary side the efficiency of the transmission of electrical power from the primary side to the secondary side is determined, and by varying the resonance frequency of the transformer or of the frequency of a primary voltage applied to the primary winding the resonance frequency and the primary voltage frequency are attuned to each other.
20 Citations
13 Claims
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1. A system for contactless energy transmission, comprising:
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a resonant transformer with a primary winding in a primary core, a secondary winding in a secondary core mechanically not connected to the primary core, and at least one capacitor, a primary control unit, a secondary control unit, a measuring device connected to the secondary winding and to the secondary control unit for acquiring an electrical state variable in the secondary winding, a primary inverter, connected to the primary winding, with variable frequency, and a modulator-demodulator device for transmitting data between the primary control unit and the secondary control unit by way of the transformer, wherein the primary control unit is connected in a controlling manner to the primary inverter, and the primary control unit is configured to change the frequency of the primary inverter when the primary control unit receives a frequency change signal, and the secondary control unit is configured, depending on the change in the electrical state variable, to transmit a signal for a frequency change in the primary inverter to the primary control unit such that a frequency of a primary voltage present at the primary winding corresponds to a resonance frequency of the resonant transformer during power transmission, wherein the system further comprises a coupling device configured to individually connect one of a plurality of primary inverters selectively to one of a group of primary windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle, comprising a system for wireless energy transmission, the system comprising:
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a resonant transformer with a primary winding in a primary core, a secondary winding in a secondary core mechanically not connected to the primary core, and at least one capacitor, a primary control unit, a secondary control unit, a measuring device connected to the secondary winding and to the secondary control unit for acquiring an electrical state variable in the secondary winding, a primary inverter, connected to the primary winding, with variable frequency, and a modulator-demodulator device for transmitting data between the primary control unit and the secondary control unit by way of the transformer, wherein the primary control unit is connected in a controlling manner to the primary inverter, and the primary control unit is configured to change the frequency of the primary inverter when the primary control unit receives a frequency change signal, and the secondary control unit is configured, depending on the change in the electrical state variable, to transmit a signal for a frequency change in the primary inverter to the primary control unit, wherein the system further comprises a coupling device configured to individually connect one of a plurality of primary inverters selectively to one of a group of primary windings. - View Dependent Claims (11, 12, 13)
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Specification