How to solve the problem of excessive voltage of electric vehicle battery

Many consumers are always confused about various faults when they are cycling. What if the battery voltage of the electric vehicle is too high? Today, I will share with you the basic fault judgment and analysis the solution:

Electric car charger failure one: how to solve the electric vehicle battery voltage is too high

Maintenance methods:

The overvoltage protection circuit can be disconnected so that the voltage protection circuit does not work, and then the mains voltage of the power supply at the instant of power-on is measured.

If the measured value is more than 1 v higher than normal, explain the reason of the output voltage is too high indeed in the control loop. At this point should be focused on checking whether the sampling resistor values or damaged, precision reference voltage source (TL431) or optical coupling device (PC817) is bad performance, deterioration or damage.

Electric vehicle charger fault 2: DC voltage output is too low

Electric vehicle battery voltage is too high: maintenance method

First check with a multimeter, under the high voltage dc filter capacitor whether metamorphism, capacity is reduced, can charge and discharge normally.

Above if no problem, then the measure of switch power tube electrode current limiting resistor and the source of the over-current protection undertaker to measure resistance value. Spoiled or open welding, poor contact. If no problem, then check if the core of high frequency transformer is in good condition.

The electric car charger fault three, a cooling fan did not turn

Maintenance methods:

First of all, under the control of the fan is measured with a multimeter triode whether damaged, if measured this tube is not damaged, there may be a fan itself is damaged, can put the fan pull down from the circuit board

In addition, connect a 12V DC (note the positive and negative poles) to see if it is turning, and if there is any foreign matter stuck. If you swing the wires of the lower fan and the fan rotates, it means that there is a broken wire inside the wire or the connector is not in good contact. If it still does not turn, the fan will definitely be broken.

How to solve the problem that the battery voltage of the electric vehicle is too high, we have some understanding through the above introduction, I hope I can help everyone!

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