Electric vehicle charger burnt resistance is usually caused by the following reasons:
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1. Overload or short circuit: If the electric vehicle charger encounters overload or short circuit during charging, the current will exceed the rated carrying capacity of the resistor, resulting in overheating and damage to the resistor.
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2. Overvoltage: If the electric vehicle charger is subjected to too high a voltage that exceeds its design and withstand range, the resistor may not be able to withstand such a voltage, resulting in the resistance burning out.
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3. Resistor quality problems: The resistor itself may have quality problems, such as poor welding, inappropriate materials, damage or aging. This can cause the resistor to be damaged or overheated during use.
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When the resistor burns, it usually smells of burning or smoke, and the charger may stop working.
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If the electric vehicle charger burns the resistance, it is recommended to take the following measures:
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1. Stop using the charger: After the resistor is found to be burned, stop using the charger immediately to avoid further damage or failure.
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2. Check the charger and power supply: Check whether the wires and plugs of the charger and power supply are damaged or abnormal. Make sure there are no other obvious problems and try to use another charger for charging.
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3. Repair or replace the charger: If the resistor burns out, it is recommended to send the charger to a professional electric vehicle repair center or contact the charger manufacturer for repair or replacement.
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It should be noted that the resistor burn out may be a signal that there is a problem with the charger, which may involve the failure of the circuit or other components. Therefore, before any repair operation, it is best to consult a professional electric vehicle repair technician who can more accurately diagnose the problem and provide the appropriate fix. At the same time, ensure the use of qualified chargers and charging equipment that meet safety standards.
Reasons for the electric car charger to burn resistance:
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1. The charger works for a long time in the state of high voltage and high current, and the internal circuit is short circuit or overcurrent.
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2, the fluctuation of the grid voltage, the surge will cause the current in the charger to increase instantaneously and make the fuse blown.
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3, the power load is too heavy, the rectifier diode in the high-frequency rectifier filter circuit is broken down.
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maintenance methods
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First carefully look at the various components on the circuit board to see if the appearance of these components has burnt or electrolyte overflow, and there is no difference in smell. Measure the power input resistance, if less than 20okω indicates that there is a local short circuit phenomenon at the back end, then the measured rectifier diode only has 4 resistance values and 2 current limiting resistance values, there is a short circuit or burn out;
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Finally, measure whether the power filter capacitor can be charged and discharged normally, whether the switching power tube is damaged or not, and whether the surrounding components are damaged or not.