Real-time online detection device for series voltage source

The utility model provides a real-time online detection device for series voltage source, comprises a plurality of voltage sampling modules, each consisting of a sampling circuit, a control circuit and a microcontroller, wherein a resistor with resistance error of 1% is utilized by a sampling resistor in the sampling circuit, a photocoupler is utilized by a control element in the control circuit, a control end of the control circuit is connected with an output end of the microcontroller, the photocouplers are controlled by the microcontroller to be switched on according to a set order, a sampling end of the sampling circuit is connected with a main controller for computing a single battery or capacitor voltage and total voltage in the series voltage source through an A/C converter, the main controller is further connected with an input end of the microcontroller for controlling the working state of the microcontroller. The utility model has the advantages of simple circuit structure, small volume, low power consumption, high efficiency, and high detection precision, which is capable of realizing inlaid mount, accurately detecting any abnormal in series voltage and greatly improving the working efficiency.