Method for the contactless charging of the battery of an electric automobile
First Claim
1. 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:
- 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, by using an analog circuit, a phase shift between the current and the voltage;
converting the phase shift into a numerical value; and
slaving a frequency of the setpoints dispatched to the inverter to the numerical value of the phase shift,wherein the slaving is implemented by a proportional integral regulator, a value of a proportional gain of the proportional integral regulator and a value of an integral gain of the proportional integral regulator optimize a rate of convergence of the frequency of the inverter to the predetermined value.
1 Assignment
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Accused Products
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.
4 Citations
7 Claims
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1. 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, by using an analog circuit, a phase shift between the current and the voltage; converting the phase shift into a numerical value; and slaving a frequency of the setpoints dispatched to the inverter to the numerical value of the phase shift, wherein the slaving is implemented by a proportional integral regulator, a value of a proportional gain of the proportional integral regulator and a value of an integral gain of the proportional integral regulator optimize a rate of convergence of the frequency of the inverter to the predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for contactless charging by magnetic induction of a battery of an electric automotive vehicle comprising 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 control board which emits as an output setpoints to the inverter; and an analog-digital converter for converting the phase shift into a numerical value, the control board being configured to slave a frequency of the 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, wherein the slaving is implemented by a proportional integral regulator, a value of a proportional gain of the proportional integral regulator and a value of an integral gain of the proportional integral regulator optimize a rate of convergence of the frequency of the inverter to the predetermined value.
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Specification