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How to maintain DC/DC converter of electric cars?

DC is the abbreviation of Direct Current in English, and AC is the abbreviation of Alternating Current in English.

More dry knowledge of electric vehicle on-board charger OBC and on-board DC/DC converter can be found in the "Dilong Power Supply" public account, from easy to difficult, from shallow to deep, all-round learning.

DC/DC converters are used in new energy vehicles such as pure electric vehicles, hybrid electric vehicles and fuel cell vehicles. There are mainly three forms of Step-down,step-up,and voltage regulation.

The function of the step-down converter is to convert the high-voltage direct current of the power battery pack into low-voltage direct current, which is used for the low-voltage electrical equipment of the whole vehicle and for charging the low-voltage battery of the automobile.

The DC/DC converter is an important component that participates in energy conversion in electric vehicles, and is an indispensable part of electric vehicles.

Since it is so important, we naturally have to maintain and maintain it. Let's learn how to maintain the DC/DC converter.


Check whether the casing of the DC/DC converter is deformed or has obvious collision marks, and then check whether there are foreign objects between the cooling fins.

If there is foreign matter,it is available by compressed air to blow away, so as not to affect the heat dissipation performance of the DC/DC converter.


Check whether the DC/DC converter connecting wire harness is firm and free of looseness, damage or cracks.

If there is any, it should be replaced or repaired in time to avoid leakage or short circuit.


Check whether the fastening bolts of the DC/DC converter are corroded and whether the fastening force is sufficient to avoid loosening of the DC/DC converter due to falling off.


Measure whether the output voltage of the DC/DC converter is normal, and judge whether it is working normally. The measurement method ensures that the wiring harness of the whole vehicle is connected normally, and the voltage at both ends of the 12V battery is measured before power-on.

Power on the vehicle, turn off the electrical appliances on the vehicle, and continue to read the value of the multimeter to check the changes.


Detect the insulation performance of the DC/DC converter, and use an insulation resistance meter to detect the insulation resistance value of the high-voltage interface of the DC/DC converter. The above is the maintenance and maintenance method of the DC/DC converter, I hope it will be helpful to everyone.

A special reminder that there is high voltage inside the electric vehicle, and non-professionals should not maintain it by themselves.

In addition, the manufacturer of the DC/DC converter shown in the picture is Dilong New Energy Technology Hebei Co., Ltd. Dilong New Energy is a manufacturer specializing in the research, development and production of on-board DC/DC converters and on-board chargers. It is a leading enterprise of domestic vehicle DC/DC converters and an expert in electric vehicle DC/DC converter solutions. The company has a standardized professional factory certified by the automotive-grade IATF16949 system. It has completed the fully automated mounting and welding process, fully automated testing, aging and other processes, which can meet the monthly production capacity of 100,000 sets.

Dilong New Energy has always adhered to independent research and development, and is a high-tech enterprise with strong research and development strength.

It has mastered the relevant core technologies of DC/DC converters earlier in the industry, and has successfully implemented the application, realizing the mass production and shipment of high-quality products. The company's products adopt international advanced LLC resonance technology, full digital control technology, soft switching technology...etc. Equipped with a high-speed DSP chip processor, it has the core advantages of high efficiency, high power density, small size, reliable and stable operation, long life and high security.

At present, the company's products have been exported to dozens of countries and regions such as South Korea, Japan, Southeast Asia, Europe and the United States.

Through unremitting efforts, Dilong New Energy has become a world-renowned supplier of automotive DC/DC converters. The output power of the company's products covers the power range of 0.3KW-5KW, which fully meets the market demand for different power products.

It is widely used in various new energy vehicles such as pure electric vehicles and plug-in hybrid vehicles.