Electric car charger repair

by:Mainbon     2021-05-31
Because the input circuit of the electric tricycle charger works under high voltage and too much current, the failure rate is the highest. Such as high-voltage and high-current rectifier transistors, filter capacitors, switching power tubes, etc.; the second most vulnerable are the rectifier diodes, protection diodes, filter capacitors, current limiting resistors, etc. of the output rectification part; and then the feedback part of the pulse width modulation controller and Protection circuit part. In general, the blown fuse tube indicates that the internal circuit of the charger has a short-circuit or over-current fault. This is due to the fact that the charger has a high failure rate of internal devices when working at high voltage and high current for a long time. In addition, fluctuations in the grid voltage and surges will cause the current in the charger to increase instantaneously and cause the fuse to blow. First, carefully check the various components on the circuit board to see if the appearance of these components is burnt or there is electrolyte overflow, and whether there is any strange smell. Then measure the resistance value of the power input terminal. If it is less than 20OkΩ, it means that there is a partial short circuit at the back end. Then measure the positive and negative resistance values u200bu200bof the 4 rectifier diodes and the resistance values u200bu200bof the two current limiting resistors to see if there is a short circuit or burnout. If there is still no such situation, then measure whether the input power line and output power line are short-circuited internally. Generally speaking, rectifier diodes, power filter capacitors, switching power tubes, and UC3842 are vulnerable parts in the fuse fusing fault, and the probability of damage can reach more than 95%. It is easy to troubleshoot the fault by checking these components. Finally, measure whether the filter capacitor of the power supply can be charged and discharged normally, whether the switching power tube is broken down and damaged, whether the UC3842 and surrounding components are broken down, burned out, etc. It should be noted that because it is measured on the road, it may make the measurement result wrong or cause misjudgment. Therefore, if necessary, the components can be welded down for measurement.
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