剩余电压测试仪的研制

Development of Residual Voltage Testing Equipment

针对现有常用剩余电压测量仪不能在峰值处精确断电、以及同步显示断电瞬间波形等问题,该文提出了一种新的剩余电压检测方法并研制成功了一种新的剩余电压测试仪。首先采用电压过零检测技术检测供电电源的零点,并将检测到的零点时刻转变成脉冲信号输入到单片机,再延时到电压峰值。其次,在电压峰值瞬间,单片机发出信号控制继电器切断待测仪器的供电电源以实现峰值瞬间断电。最后,断电后待测仪器电源线各插头上的残余电压值输送到上位机显示待测仪器断电后的放电波形及残余电压值,或者利用示波器显示剩余电压的结果。实验结果表明,该文研制的仪器能够精确地在电压峰值处断电且同时显示放电波形及残余电压值,1 s后的剩余电压值的标准差小于0.2 V。

For the existing measurement methods of residual voltage which can＆#39;t turn the power off at peak voltage exactly and simultaneously display waveforms, a new residual voltage detection method is put forward in this paper. First, the zero point of the power supply is detected with zero cross detection circuit and is inputted to a single-chip microcomputer in the form of pulse signal. Secend, when the zero point delays to the peak voltage, the single-chip microcomputer sends control signal to power off the relay. At last, the waveform of the residual voltage is displayed on a principal computer or osciloscope. The experimental results show that the device designed in this paper can turn the power off at peak voltage and is able to accurately display the voltage waveform immediately after power off and the standard deviation of the residual voltage is less than 0.2 V at exactly one second and later.