The invention relates to measurement devices and discloses a device for measuring the
voltage difference between LED string lights. According to the device for measuring the
voltage difference between the LED string lights, the
voltage difference between the LED string lights when the LED string lights work can be detected rapidly, so that the production yield of a
production line is increased, and the reliability of products is guaranteed. The device for measuring the voltage difference between the LED string lights comprises a voltage following circuit unit, a voltage distribution unit, an analog-
digital converter, a
signal processor, an analog-
digital converter and a same-phase proportional
operational amplifier unit, wherein the voltage following circuit unit, the voltage distribution unit, the analog-
digital converter, the
signal processor, the analog-digital converter and the same-phase proportional
operational amplifier unit are connected in sequence, the input
signal of the voltage following circuit unit serves as the negative-
electrode voltage of the LED string lights, the output signal of the voltage following circuit unit enters the corresponding analog-digital converter after voltage distribution is conducted on the output signal through the voltage distribution unit, the voltage obtained through analog-
digital conversion is input into the signal processor, so that maximum voltage and minimum voltage distinguishing and difference value calculating are conducted, an
analog signal is obtained through conversion of the corresponding analog-digital converter, the output signal of the corresponding analog-digital converter is connected to the input end of the same-phase proportional
operational amplifier unit, and the output value obtained after
signal amplification is the voltage difference between the maximum value and the minimum value of a target voltage. The device is suitable for voltage testing of the LED string lights.