Capacitor polarity detection circuit and method

Abstract

The present invention discloses a capacitor polarity detection circuit and method. The method comprises the steps of: controlling a first single pole triple throw simulation switch to be switched to an ADC1 by an MCU, and controlling a second single pole triple throw simulation switch to be switched to an ADC2 by the MCU; reading and calculating a voltage difference of the ADC1 and the ADC2, and storing the voltage difference as X1; controlling the first single pole triple throw simulation switch to be connected with a sixth discharge resister by the MCU, controlling the second single pole triple throw simulation switch to be connected with a seventh discharge resister by the MCU to perform capacitor discharge; controlling the first single pole triple throw simulation switch to be switchedto an ADC2 by the MCU, controlling the second single pole triple throw simulation switch to be switched to the ADC1, reading and calculating the voltage difference of the ADC1 and the ADC2, and storing the voltage difference as X2; and X1 is larger than X2, determining that a pin of a capacitor to be detected connected with A is a positive pole and a pin of the capacitor to be detected connectedwith B is a negative pole. The capacitor polarity detection circuit and method can be applied to a production line test tool for online test of the polarity welding error problem of the capacitor on aproduct, and the capacitor polarity detection circuit and method is low in cost and convenient to apply and can perform automatic test with no need for manual intervention.

Description

technical field [0001] The invention relates to the technical field of single-chip electronic detection, in particular to a capacitor polarity detection circuit and method. Background technique [0002] Electrolytic capacitors usually play the role of power supply filtering, decoupling, signal coupling, time constant setting and DC blocking in power supply circuits or intermediate frequency and low frequency circuits. Electrolytic capacitors have the characteristics of a very large capacitance per unit volume, a very large rated capacity, and an overwhelming price advantage over other types. The equipment for manufacturing electrolytic capacitors is also common industrial equipment, which can be mass-produced at a low cost. relatively low. Therefore, electrolytic capacitors are often used in various electronic devices at present. Electrolytic capacitors are capacitors with polarity. If the polarity is incorrectly welded, it may cause explosion after the device is powered on...

AI Technical Summary

Problems solved by technology

Therefore, electrolytic capacitors are often used in various electronic devices at present. Electrolytic capacitors are capacitors with polarity. If the polarity is incorrectly welded, it may cause explosion after the device is powered on, and seriously cause production safety accidents.

At present, the detection of capacitor polarity on the production line generally adopts the visual method, and the accuracy can be guaranteed when the production volume is small and the time is sufficient. When the production volume is relatively large and the detection time is tight, errors are prone to occur.

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