Electrically powered vehicle and method of charging an electrical energy storage device of an electrically powered vehicle
First Claim
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1. An electrically powered vehicle, comprising:
- a drive apparatus having an electric machine and an electrical energy storage device connected to said electric machine;
a charging device connected to said electrical energy storage device for a wireless transfer of energy by way of an alternating magnetic field, said charging device having an electronic coil configured to interact with the alternating magnetic field; and
a settable compensating circuit connected to said electronic coil, said compensating circuit including an adjustable first capacitor having an adjustable capacitance connected to form with said electronic coil a series circuit, and an adjustable second capacitor having an adjustable capacitance connected in parallel with said series circuit formed of said electronic coil and said first capacitor; and
a control device connected to said compensating circuit and configured for adjusting said first capacitor to maximize a power level of a charging operation and for subsequently adjusting said second capacitor to maximize an efficiency of the charging operation.
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Abstract
An electrically powered vehicle has a drive apparatus which includes an electric machine and an electrical energy storage device connected to the electric machine. A charging device is connected to the electrical energy storage device for the wireless transfer of energy by way of an alternating magnetic field. For that purpose, the charging device has an electronic coil which interacts with the alternating magnetic field. The electronic coil is connected to an adjustable compensating circuit.
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Citations
9 Claims
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1. An electrically powered vehicle, comprising:
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a drive apparatus having an electric machine and an electrical energy storage device connected to said electric machine; a charging device connected to said electrical energy storage device for a wireless transfer of energy by way of an alternating magnetic field, said charging device having an electronic coil configured to interact with the alternating magnetic field; and a settable compensating circuit connected to said electronic coil, said compensating circuit including an adjustable first capacitor having an adjustable capacitance connected to form with said electronic coil a series circuit, and an adjustable second capacitor having an adjustable capacitance connected in parallel with said series circuit formed of said electronic coil and said first capacitor; and a control device connected to said compensating circuit and configured for adjusting said first capacitor to maximize a power level of a charging operation and for subsequently adjusting said second capacitor to maximize an efficiency of the charging operation. - View Dependent Claims (2, 3)
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4. A method of operating a charging device of an electrically powered vehicle, the vehicle having a drive apparatus with an electric machine and an electrical energy storage device connected to the electric machine, the method comprising:
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receiving with the charging device energy from an alternating magnetic field by way of an electronic coil disposed to interact with the alternating magnetic field and to feed the energy to the electrical energy storage device in the form of electrical energy; setting the charging device with a settable compensating circuit connected to the electronic coil and controlled by a control device by the following steps; setting a power transferred to the charging device by the alternating magnetic field by adjusting a capacitance of a first adjustable capacitor of the compensating circuit connected in series with the electronic coil; continuing the step of setting the power until a pre-determined comparison value for the transferred power is reached; and subsequently setting an efficiency level in relation to a power transferred by adjusting a capacitance of a second adjustable capacitor of the compensating circuit connected in parallel with a series connection formed of the electronic coil and the first capacitor; and continuing the step of setting the efficiency level until a maximum value for the efficiency level is reached. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification