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How to choose a high-quality electric vehicle charger – Semco University


With the development of science and technology and the improvement of people’s living standards, digital products have become a necessity in people’s lives. Because of the large demand, there are many kinds of products on the market, and the quality is also uneven. So how should we identify the quality of the charger? Let me briefly explain it to you. If there is any incomprehensive, I hope to point out common progress.
High Quality Electric vehicle chargers will inevitably face some non-human reasons such as damage and failure in the process of use, which will be delayed. In previous years, the fire caused by the failure of electric vehicle chargers (ev vehicle charger) has been seen. The government has proposed to prohibit families from pulling wire charging, but because the inferior chargers sold by bad merchants have caught fire because of too much current. If there is a hidden fire hazard, once the electrical appliance catches fire, it will be too difficult to extinguish it.


I don’t know if some friends will find that every time the electric car is charged and un‐plugged the charger, it will feel hot. This means that your charger conversion efficiency is not so high. For safety, try to replace your charger to avoid danger.

1. How to Choose an High Quality Electric Vehicle Charger?

What indicators should I see for a good charger?

A charger is a converter that converts AC to DC, turning the AC 220v into rechargeable DC. It can be said to be a power supply. From the perspective of the direction of the power supply, the measure is efficiency.

How much can be effectively converted, effective conversion means reducing heat. Generally, a good charger can achieve a maximum efficiency of 95%, that is to say, 95% of the electrical energy can be effectively converted, and only 5% of the electric energy can be converted into heat. Because thermal energy is not good for the charger, efficiency is an indicator to measure the charger. A good charger has overheating protection. If it is overheated, it will stop charging.

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2. Analysis of Inferior Chargers

If it’s a bad charger, it’s basically unprotected if it’s overheated, it’s very dangerous. Once the overheating time is long, the charger is prone to spontaneous combustion, so it is necessary to have a good fan, a good heat exhaust system, high efficiency and a good air-cooling system. Secondly, the charger life and various resistance capacitors, especially some intermediate and high-frequency transformers in some electrolytic capacitors, should be better. Then there is the internal charging curve, because the charger now usually has a single-chip microcomputer (MCU) with a fixed curve. What voltage is your battery, how much current the charging process gives the battery, and how many temperatures and how many currents are. A good charger can also introduce the surface temperature of the battery as a control indicator, so that a charging curve will not harm the battery.

3. How to Detect the Quality of a Charger

1. Safety

Generally speaking, the circuit structure, mechanical structure and electrical performance of the product should meet certain safety requirements. Whether the product is in a normal working state or abnormal working state (such as output overload or short circuit, internal component failure or circuit failure, etc.), the safety of people and property should not be endangered. In order to achieve this goal, the safety requirements of charger products (such as shock protection performance, insulation performance, temperature, etc.) should meet the requirements of the national mandatory standard GB4943-2001.

2. Electromagnetic Compatibility

For charger products, the electromagnetic compatibility requirements are mainly reflected in electromagnetic harassment. Electromagnetic harassment is divided into conduction harassment and radiation harassment. Due to the many advantages of switching power supply, the switching power supply circuit is generally used for chargers. However, the high-frequency on and off of switching devices in the switching power supply will generate high-frequency harmonic signals. The trans-mission of these high-frequency signals through power grids or through space radiation will bring electromagnetic pollution to the environment, harass the normal operation of surrounding electronic equipment, and may also have adverse effects on the safe operation of the power grid and human health. Therefore, in order to reduce the electromagnetic pollution of the environment, it is required that the electrical terminal (or interface terminal) harassing voltage and radiation harassment field intensity should be less than a certain limit when the electronic product works.

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3. Performance

Different types of batteries have different charging requirements, mainly charging methods, charging current, charging voltage and other parameters.

(1) Charging method: It is stipulated that the charger charges the battery in a constant current mode or constant voltage.

(2) Charging current: The maximum output current of the charger is specified. The size of the charging current should match the capacity of the adapted battery, and generally should not be greater than 1C5A.

(3) Charging voltage: The maximum output voltage of the charger is specified. The charging voltage depends on the charging limit voltage of the battery


As long as it can meet the above views, it is generally not easy to overheat and heat up and other key problems. Ads you to remind you that when charging electric vehicles, don’t pull the wires without permission to block the charger vents, which will overheat the charger, and if it is light, it will damage the battery and easily cause fire.

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History of Lithium Battery Development,
Production problems of lithium batteries,

Formation Process of Lithium Battery,
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Electric Vehicle Maintenance Practical Dry Goods,
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