Device for charging a battery of a motor vehicle on the basis of a single-phase power supply network, and method of controlling the device

A device for charging a battery, or charging a battery of an electric-traction motor vehicle, from a single-phase power supply network, the device comprising:

• a filtering stage configured to be connected to the single-phase network;
• a voltage step-down stage connected to the filtering stage;
• a voltage step-up stage configured to be connected to the battery and coupled to the voltage step-down stage via an inductive component or an inductance coil;
• and
• a control unit configured to impose chopping duty cycles on the voltage step-down stage and the voltage step-up stage,
• wherein the control unit includes means for compensating for a phase shift between an input current of the voltage step-down stage and an input voltage of the voltage step-down stage,
• wherein the control unit includes a first open-loop control module configured to determine a chopping duty cycle of the voltage step-down stage as a function of a voltage of the single-phase power supply network, a setpoint power, and an intensity of current flowing through the inductive component, to compensate for the phase shift between the input current of the voltage step-down stage and the input voltage of the voltage step-down stage, and to control power received by the battery as a function of the setpoint power, and
• wherein the control unit includes a second control module configured to determine a chopping duty cycle of the voltage step-up stage as a function of a voltage at an output of the voltage step-down stage, a voltage of the battery, and a difference between the setpoint induction intensity and the intensity of the current flowing through the inductive component, providing closed-loop control of an intensity of a current flowing through the battery.

A method for controlling charging of a battery, or a battery of a motor vehicle, from a single-phase network, in which an input voltage is filtered, electrical power is taken from a network to the battery via a voltage step-down stage and a voltage step-up stage coupled via an inductive component or an inductance coil, the method comprising:

• compensating for a phase shift between an input current of the voltage step-down stage and an input voltage of the voltage step-down stage;
• controlling the input current of the voltage step-down stage via an open-loop control of a chopping duty cycle of the voltage step-down stage as a function of a voltage of the single-phase power supply network, a setpoint power, and an intensity of the current flowing through the inductive component, to compensate for the phase shift between the input current of the voltage step-down stage and the input voltage of the voltage step-down stage, and to control power received by the battery as a function of the setpoint power;
• and
• locking an intensity of a current flowing through the battery to a reference battery intensity via a closed-loop control of a chopping duty cycle of the voltage step-up stage as a function of a voltage at an output of the voltage step-down stage, a voltage of the battery, and a difference between a setpoint induction intensity and an intensity of the current flowing through the inductive component.