Electrolytic capacitor polarity detection circuit and detection device

Abstract

The invention discloses an electrolytic capacitor polarity detection circuit, which includes a power supply circuit, a detection circuit for connecting to a capacitor to be tested, a comparison circuit for outputting different levels when the capacitor to be tested is inserted forwardly or reversely inserted, and a circuit for controlling A control indicator circuit for indicating the working state of the load in the circuit; the power supply circuit includes a first voltage divider circuit; the detection circuit is coupled with the first voltage divider circuit, and connected to the inverting input terminal of the comparison circuit to input in phase with the comparison circuit Compared with the preset voltage at the terminal, the comparison circuit outputs a level signal; the control indicator circuit is connected to the output terminal of the comparison circuit, and the working state of the control indicator circuit is controlled by the level signal output by the comparison circuit. The invention also discloses an electrolytic capacitor polarity detection device using the above circuit. The invention is applied to detect whether the capacitance on the circuit board is reversely inserted, solves the problem of inaccurate detection, and has the advantages of accurate results, no damage to devices, and the like.

Description

technical field [0001] The invention relates to the field of capacitance detection, in particular to the field of electrolytic capacitor polarity detection circuit and inspection device. Background technique [0002] Electrolytic capacitors are divided into positive polarity and negative polarity. When the electrolytic capacitor is integrated on the circuit board, the polarity may be reversed. The reversed polarity of the electrolytic capacitor may cause the reliability of the circuit board to decrease and the function to fail. At present, when detecting whether the electrolytic capacitor is inserted backward, it mainly relies on manual detection or AO equipment for comparative analysis. In addition, it uses the difference in leakage between the positive and negative electrodes and the shell for detection. [0003] An online capacitor polarity tester is disclosed in Chinese invention patent CN202443090U. This patent utilizes the principle of different leakage between the po...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned tester can detect the polarity of capacitance detection, it needs the probe to be in contact with the shell to detect the polarity of the capacitor, which may cause damage to the capacitor shell, and it is difficult to ensure good contact with the shell, resulting in inaccurate detection

The tester can only test the capacitance, and cannot perform subsequent circuit function tests, and the efficiency is low

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