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

Abstract

A device for charging a battery, in particular a battery of an electric traction motor vehicle, on the basis of a single-phase power supply network, including a filtering stage intended to be connected to the single-phase network, a voltage step-down stage connected to the filtering stage, a voltage step-up stage intended to be connected to the battery and coupled to the voltage step-down stage via an inductive component such as an induction coil, a regulating unit able to impose chopping duty ratios on the voltage step-down stage and on the voltage step-up stage. The regulating unit includes means for compensating for the phase shift between the imput current of the voltage step-down stage and the imput voltage of the voltage step-down stage.

1 . A device for charging a battery ( 13 ), in particular a battery of an electric-traction motor vehicle, from a single-phase power supply network, comprising a filtering stage ( 2 ) intended to be connected to the single-phase network, a voltage step-down stage ( 3 ) connected to the filtering stage ( 2 ), a voltage step-up stage ( 4 ) intended to be connected to the battery ( 13 ) and coupled to the voltage step-down stage ( 3 ) via an inductive component (L d ) such as an inductance coil, a control unit ( 15 ) able to impose chopping duty cycles (a, a s ) on the voltage step-down stage ( 3 ) and the voltage step-up stage ( 4 ),
 characterized in that the control unit ( 15 ) includes means for compensating for the phase shift between the input current (I f ) of the voltage step-down stage ( 3 ) and the input voltage (V c ) of the voltage step-down stage ( 3 ),   the control unit ( 15 ) including a first open-loop control module ( 16 ) able to determine a chopping duty cycle (a) of the voltage step-down stage ( 3 ) as a function of the voltage (V e ) of the single-phase power supply network, a setpoint power (P bat   ref ), and the intensity (I d ) of the current flowing through the inductive component (L d ), to compensate for the phase shift between the input current (I f ) of the voltage step-down stage ( 3 ) and the input voltage (V c ) of the voltage step-down stage ( 3 ), and to control the power (P bat ) received by the battery as a function of the setpoint power P bat   ref ),   the control unit ( 15 ) including a second control module ( 17 ) able to determine a chopping duty cycle (a s ) of the voltage step-up stage ( 4 ) as a function of the voltage (V kn ) at the output of the voltage step-down stage ( 3 ), the voltage (V bat ) of the battery ( 13 ), and the difference between the setpoint induction intensity (I d   ref ) and the intensity (I d ) of the current flowing through the inductive component (L d ), providing closed-loop control of the intensity (I bat ) of the current flowing through the battery ( 13 ).