Claw type vacuum pump, claw type air pump, claw type water pump, etc., after connecting the power supply, the power supply voltage should be stable under any load and working condition. With switching power supply is a better solution. If the power supply is not regulated, the voltage may be very high when the pump is not connected. Once the pump is connected, the power supply voltage will drop sharply. Even if the voltage after connecting the pump is equal to the rated working voltage. At this time, the power supply voltage will fluctuate abnormally, leading to the pump's work will be completely disordered.
It is also not advisable to divide and depressurize by resistance, because the working current of pump will change when the load of gas (water) circuit changes, which will lead to the change of resistance voltage. Therefore, the power supply must have voltage stabilizing function. In actual purchase, with and without voltage stabilizing function, the price difference is very small, it is recommended to buy with voltage stabilizing function.
The output current that the power supply can provide must be larger than the working current of the pump, so as to ensure the energy demand of the pump. And choose power supply, must not choose the price is too cheap switching power supply. In order to attract customers to buy this kind of power supply, the parameters usually have false mark and false report.
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