Testing system for DC-DC converter of fuel cell vehicle

Abstract

The invention, which relates to the technical field of power electronics of the fuel cell vehicle, discloses a testing system for a DC-DC converter of a fuel cell vehicle. The system comprises a boost type DC-DC converter, a buck type DC-DC converter, a low-voltage storage battery group, a high-voltage storage battery group, a pre-charging and protection circuit, and an upper computer communication network. The boost type DC-DC converter and the buck type DC-DC converter form an energy cycle system. The low-voltage storage battery group and the high-voltage storage battery group adjust a step-up ratio and a step-down ratio of the DC-DC converters stably. The pre-charging and protection circuit is used for realizing pre charging of internal capacitors of the DC-DC converters and over-current protection on the testing system. The upper computer communication network controls and monitors the states of the DC-DC converters. According to the system, various working states of the boost type DC-DC converter and / or the buck type DC-DC converter in the fuel cell vehicle power system can be tested flexibly and comprehensively; only a few energy losses are caused; and functional and economic requirements of the DC-DC converter testing system are met.

Description

technical field [0001] The invention relates to a test system suitable for a DC-DC converter of a fuel cell vehicle, belonging to the technical field of fuel cell vehicle power electronics. Background technique [0002] Fuel cell vehicles are new energy vehicles with high efficiency, low emissions and long driving range. In order to effectively utilize energy, existing fuel cell vehicles usually add battery packs and / or supercapacitors as auxiliary power sources to achieve functions such as dynamic power supplementation and braking energy recovery. To this end, a DC-DC converter is required to connect the two power sources, adjust the power output of the fuel cell, and match the voltage levels of the two power sources. [0003] The DC-DC converter is at the core of the fuel cell vehicle power system. The power level of the DC-DC converter used for fuel cell vehicles is between tens to hundreds of kilowatts. Generally, the control mode of controlling the terminal current of ...

AI Technical Summary

Problems solved by technology

If a resistive load is used to test the DC-DC converter of a fuel cell vehicle with high power for a long time, even if the test conditions required by the DC-DC converter can be met, a large amount of energy will be consumed, and all of it will be dissipated in the form of heat

According to the above analysis, for the existing test system, it is very difficult to meet the functional and economic conditions of the test of the fuel cell vehicle DC-DC converter under laboratory conditions

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