BIDIRECTIONAL ENERGY-CONVERSION APPARATUS OF A DC-DC TYPE OPERATING BETWEEN A LOW-VOLTAGE SYSTEM AND A HIGH-VOLTAGE SYSTEM OF A VEHICLE COMPRISING AN ENERGY-RECOVERY STAGE, AND CORRESPONDING METHOD

摘要

A bidirectional energy-conversion apparatus of a DC-DC type operating between a low-voltage system (LV) and a high-voltage system (HV) of a vehicle comprising an energy-recovery stage (30), said low-voltage system (LV), which operates at a first voltage (V_bat), comprising a battery (14) that supplies said first voltage (V_bat) on a low-voltage bus (LV), said high-voltage system (HV), which operates at a second voltage (V_inDCDC, V_DClink) higher than said first voltage (V_bat), comprising said energy-recovery stage (30) of the vehicle that supplies said second voltage (V_inDCDC; V_DClink), said second voltage (V_inDCDC, V_DClink) being supplied through an intermediate energy-storage system (40) to a DC-DC conversion module (23; 123), which converts said second voltage (V_inDCDC, V_DClink) into said first voltage (V_bat) for said low-voltage bus (LV). The aforesaid DC-DC conversion module (123) comprises a bidirectional DC-DC converter (124) connected between the intermediate energy-storage stage (40) and the vehicle battery (14). Said apparatus is configured for selecting a direction of conversion of said bidirectional converter (124), from high voltage (HV) to low voltage (LV) or from low voltage (LV) to high voltage (HV) via a control circuit (140) as a function of the value of the voltage (V_DClink) on the high-voltage bus (HV).