DC/DC converter apparatus, vehicle, fuel cell system, and method of driving DC/DC converter apparatus

Abstract

PROBLEM TO BE SOLVED: To downsize and lighten a 6in1 module (having such a structure that upper and lower three arm elements are fixed onto one heat radiating plate), which constitutes a three-phase DC / DC converter.SOLUTION: Switching is rotated in order such that UVW-phase arms, which constitute three-phase arms, are switched in turns, such that drive signals UH UL, VH, VL, WH and WL, when switching on the phase arms of a DC / DC converter consisting of three-phase arms, and that the lower arm element of U-phase arm is switched on after switching on the upper arm of some phase arm, for example, the U-phase arm, and then the upper arm element of the V-phase arm being the next phase arm is switched on and then the lower arm element of the V-phase arm is switched on, when switching them in turns.

Description

technical field [0001] The present invention relates to a DC / DC converter for raising and lowering DC voltage, a DC / DC converter device, a vehicle or a fuel cell system equipped with the DC / DC converter device, and a driving method for the DC / DC converter device. Background technique [0002] Conventionally, DC / DC converter devices, which are switching power supplies using switching elements such as MOSFETs and IGBTs, have been widely used. [0003] For example, as one form of a vehicle using an electric motor as a driving source for travel, a vehicle equipped with a DC / DC converter device for stepping up or down DC voltage between a power storage device and an inverter-driven motor has been proposed (herein , known as electric vehicles). In this electric vehicle, when the motor is driven, the voltage of the power storage device is boosted by the DC / DC converter and applied to the inverter, and when the motor is regenerated, the regenerative voltage generated in the invert...

AI Technical Summary

Problems solved by technology

[0020] However, as shown in FIG. 19B , when three transistors are simultaneously on, in the case of heat transfer from each transistor shown shaded , the heat is concentrated in the part of the double shadow, and the heat dissipation efficiency is very poor

In order to satisfy heat conditions such as the maximum allowable temperature of the transistor, it is necessary to increase the volume and surface area of ​​the radiator plate 12, and at the same time, it is necessary to increase the flow rate of cooling water for cooling the radiator plate 12, resulting in the size of the DC / DC converter device 16. The problem of upscaling

Images