Short circuit detection circuit

Abstract

The invention relates to a short circuit detection circuit which comprises a first detection end, a second detection end, a constant current circuit, a constant voltage circuit, a current amplification circuit, a defective product prompting circuit, a defective product alarm circuit, a non-defective product prompting circuit, a first driving circuit, a second driving circuit, a third driving circuit and a power supply VCC, wherein the first driving circuit is connected with the non-defective product prompting circuit and the second detection end, the first end of the second switching tube, a positive electrode of the diode D1, the non-defective product prompting circuit and the defective product prompting circuit are all connected with the power supply VCC, and the second driving circuit is connected with the first driving circuit, the second detection end and the defective product prompting circuit. The whole circuit is ingenious and reasonable in structural design, the stability and reliability in the detection process are ensured, whether short circuit exists or not can be known independently, the situation can be prompted independently, and mutual interference is avoided; therefore, the short-circuit detection requirements of different occasions can be met.

Description

technical field [0001] The invention relates to the technical field of earphone production, in particular to a short-circuit detection circuit, which is mainly applied to earphones. Background technique [0002] The current earphones are getting smaller and smaller, and the speakers inside are also getting smaller, which leads to the need to make the wiring board on the speakers smaller. However, considering the adhesion of copper and platinum on the wiring board, the surface of the wiring board is maximized, and the edge of copper and platinum is almost flush with the edge of the board. [0003] The thickness of the base material of this wiring board is usually 0.2mm, plus the thickness of 0.1mm glue, that is to say, the distance between the welding point and the metal pot frame of the speaker is often only about 0.3mm. When the lead wire and the speaker are input, the probability of short circuit between the solder joint and the metal frame is very high, which is in contr...

AI Technical Summary

Problems solved by technology

In addition, the existing short-circuit detection circuit also uses a single industrial control indicator to indicate whether it is a good product. Once the industrial control indicator is damaged, it is difficult to get the prompt of the detection result.

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