METHOD FOR THE CONTACTLESS CHARGING OF THE BATTERY OF AN ELECTRIC AUTOMOBILE
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Abstract
A method for contactless charging of the battery of an electric automobile by magnetic induction using a transmitter coil of a charging device and a receiver coil of the vehicle, the method including: controlling a power supply of a converter, at terminals of which the transmitter coil is connected, according to a variable frequency; measuring, in an analog circuit, a value of a current and of a voltage at the terminals of the transmission coil; calculating a phase shift between the current and the voltage; converting the phase shift into a digital value; and locking the variable frequency of the converter to the phase-shift value by digital processing.
14 Citations
16 Claims
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1-8. -8. (canceled)
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9. A method of contactless charging of a battery of an electric automotive vehicle by magnetic induction between an emitting resonant circuit including an emitting coil of a charging device and a receiving resonant circuit of the vehicle including a receiving coil, the vehicle being positioned above the emitting coil for magnetic coupling between the emitting coil and the receiving coil, the method comprising:
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commanding an electrical power supply together with setpoints of an inverter across terminals of which is linked the emitting coil in a variable frequency; measuring in an analog circuit a value of a current and of a voltage across the terminals of the emitting coil; computing a phase shift between the current and the voltage; converting the phase shift into a numerical value; and slaving by a digital processing a frequency of the switching setpoints dispatched to the inverter to the numerical value of the phase shift. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system for contactless charging by magnetic induction of a battery of an electric automotive vehicle, a receiving resonant circuit which includes a receiving coil, the system comprising:
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an emitting resonant circuit comprising an emitting coil; an inverter across terminals of which is linked the emitting coil; an analog and digital motherboard on which are disposed an analog circuit and a control board, a current and a voltage across the terminals of the emitting coil being measured and processed by the analog circuit that computes an absolute value of a phase shift between the current and the voltage, a phase shift signal arising from the analog circuit being injected as an input into the digital control board which emits as an output a frequency setpoint to the inverter; and an analog-digital converter for converting the phase shift into a numerical value, the control board being configured to slave by a digital processing a frequency of the switching setpoints dispatched to the inverter to a value of the phase shift, for magnetic coupling between the emitting coil and the receiving coil when the vehicle is positioned above the emitting coil.
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Specification