METHOD FOR THE CONTACTLESS CHARGING OF A BATTERY OF AN ELECTRIC MOTOR VEHICLE

• US 20150048788A1
• Filed: 03/05/2013
• Published: 02/19/2015
• Est. Priority Date: 03/19/2012
• Status: Active Grant

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Doffin, Hugues, Cregut, Samuel
• Granted Patent: US 9,738,166 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/39 with position-responsive activation of primary coils
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A method for contactless charging of a battery of an electric motor vehicle by magnetic induction using a transmitter coil of a charging device and a receiver coil of the vehicle, the method including: controlling electrical power supply and instructions of an inverter at terminals of which the transmitter coil is connected, according to a variable frequency; measuring, in an analog circuit, at least one analog signal relative to a current or to a voltage at terminals of the transmitter coil; digitally processing at least two incoming digital signals by a control board, a first incoming signal being relative to the voltage and a second incoming signal being relative to the current; transmitting output signals from the control board to the inverter to lock the inverter to a value of a phase difference calculated between the current and the voltage.

Claims

1-12. -12. (canceled)

13. A method of contactless charging of a battery of an electric motor vehicle by magnetic induction between a resonant transmitter circuit including a transmitter coil of a charging device and a resonant receiver circuit of the vehicle including a receiver coil, the vehicle being positioned above the transmitter coil to provide magnetic coupling between the transmitter coil and the receiver coil, the method comprising:

a) controlling electrical power supply and instructions of an inverter to terminals of which the transmitter coil is connected according to a variable frequency;

b) measuring in an analog circuit at least one analog signal relating to a current or to a voltage across terminals of the transmitter coil;

c) digitally processing, by a control card, at least two incoming signals, of a first incoming digital signal relating to the voltage and a second incoming digital signal relating to the current, to calculate a phase difference between the current and the voltage;

d) transmitting digital output signals from the control card to the inverter to lock the inverter to the calculated value of the phase difference between the current and the voltage.

14. The method as claimed in claim 13, further comprising:

converting the at least one analog signal to at least one digital signal.

15. The method as claimed in claim 14, wherein:

during c), the at least two incoming digital signals are formed by a digital signal relating to the voltage and a digital signal relating to the current, these two signals resulting from the converting.

16. The method as claimed in claim 14, wherein, during c), the at least two incoming digital signals are formed, according to choice, by:

a digital signal relating to the current and resulting from the converting, and an output digital signal relating to the voltage, or

a digital signal relating to the voltage and resulting from the converting, and an output digital signal relating to the current.

17. The method as claimed in claim 13, further comprising:

comparing;

a number of incrementations of a first counter associated with the digital signal relating to a first physical quantity of voltage type or of current type during a period; and

a number of incrementations of a second counter associated with the digital signal relating to a second physical quantity, different from the first physical quantity, of the current type or of the voltage type, when the digital signal relating to the first physical quantity begins a new period;

the first and second counters being incremented regularly in time;

calculating a difference in incrementation between the first and second counters;

determining a phase difference between the first and second physical quantities as a function of the difference in incrementation between the first and second counters.

18. The method as claimed in claim 13, wherein the locking by the digital processing is implemented by a proportional-integral controller in which a value of the proportional gain and a value of the integral gain are chosen to optimize a speed of convergence of an inverter frequency to the predetermined value.

19. The method as claimed in claim 13, further comprising at least filtering the value of the phase difference.

20. A non-transitory computer readable medium including a computer program, including instructions for executing the method of contactless charging of a battery of a motor vehicle as claimed in claim 13, when the program is executed by a computer.

21. A system of contactless charging, by magnetic induction, of a battery of an electric motor vehicle, in which a resonant receiver circuit includes a receiver coil, the system comprising:

a resonant transmitter circuit comprising a transmitter coil;

an inverter, to terminals of which the transmitter coil is connected;

an analog and digital motherboard on which a control card is located, at least one analog signal relating to a physical quantity of a current or voltage type at terminals of the transmitter coil being measured to be digitally processed by the control card, at least two digital signals including a first digital signal relating to a voltage and a second digital signal relating to a current being injected into an input of the digital control card, which transmits from its output at least one digital signal forming a switching instruction for the inverter, the control card digitally processing the at least two digital signals injected into the input of the control card for calculating a phase difference between the current and the voltage;

the control card being configured to lock a frequency of the switching instructions sent to the inverter to a value of the phase difference by digital processing, so that magnetic coupling can be provided between the transmitter coil and the receiver coil when the vehicle is positioned above the transmitter coil.

22. The system as claimed in claim 21, wherein a converter is provided on the analog motherboard and is configured to convert at least one analog signal to at least one digital signal.

23. The system as claimed in claim 22, wherein the first and second signals injected into the input of the control card are output from the converter.

24. The system as claimed in claim 21, wherein the first signals and second signals, injected into the input of the control card, are output from the converter and from the control card respectively.