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Time：2021-08-09Views：0
For many products, if the power supply is reversed, the product will burn, or the insurance will be burned. Then the power cord of the cooling fan will burn if the power cord is reversed? This needs to be divided into several situations
1. The drive chip of the cooling fan has no polarity protection function.
2. If the driver chip has a built-in polarity protection function, if the cooling fan is plugged in reversely, the current will become larger, and it will not burn in a short time, but it will cause the motor temperature rise to increase, because the driver chip is very separate from the motor. Recently, if the temperature rise of the motor exceeds the temperature of the chip, some chips will be in a protected state, and some chips will be thermally broken down.
3. There is a reverse diode on the PCB control board of the cooling fan, and the power cord connection will not burn
After the power is turned on, if you find that the cooling fan does not work, the first thing you worry about is whether the cooling fan is faulty. In fact, it is not necessarily. The following situations are caused by non-matching
1. Use a constant current source as the power supply. If the output current of the constant current source is inconsistent with the current of the cooling fan, the cooling fan will not rotate, which will be very abnormal.
2. Use the power supply after the voltage regulator, if the voltage is lower than the starting voltage of the cooling fan, it will also cause the fan to fail to rotate
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2021-10-18
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