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                        • Dongguan Weiqing Electronics Co.,Ltd
                          Home > News > Content

                          Varistor Selection Tips

                          Dongguan Weiqing Electronics Co.,Ltd | Updated: Jan 30, 2019

                          Nominal voltage selection

                          Generally speaking, the varistor is used in parallel with the protected device or device. Under normal conditions, the DC or AC voltage across the varistor should be lower than the nominal voltage, even when the power supply fluctuation is the worst. The maximum continuous operating voltage selected in the rated value, the nominal voltage value corresponding to the maximum continuous operating voltage value is the selected value. For overvoltage protection applications, the varistor voltage should be greater than the actual circuit voltage. Generally, use the following formula to select: VmA=av/bc where: a is the circuit voltage fluctuation coefficient, generally 1.2; v is the circuit DC Working voltage; b is the varistor voltage error, generally 0.85; c is the aging coefficient of the component, generally 0.9; the actual value of VmA calculated is 1.5 times of the DC operating voltage, and the peak value is also considered in the AC state. The calculation result should be expanded by 1.414 times. In addition, you must also pay attention to the selection:

                          3d奖号715前后关系(1) It must be ensured that the continuous operating voltage will not exceed the maximum allowable value when the voltage fluctuation is maximum, otherwise the service life of the varistor will be shortened;

                          (2) When a varistor is used between the power supply line and the ground, the voltage between the line and the ground may rise due to poor grounding. Therefore, a varistor with a higher nominal voltage than the line-to-line use is usually used. The surge current absorbed by the varistor should be less than the maximum flux of the product.

                          Dongguan Weiqing Electronics Co.,Ltd

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