Overcurrent protection circuit, power supply interface and mobile terminal

Abstract

The invention relates to the technical field of power supplies and discloses an overcurrent protection circuit, a power supply interface and a mobile terminal. The circuit comprises an integrating circuit, a voltage sampling circuit, a field effect transistor Q1, a field effect transistor Q2 and a voltage dividing resistor R1, wherein the input terminal of the integrating circuit is connected with a power supply system and the drain electrode of the field effect transistor Q1, the output terminal of the integrating circuit is connected to the grid of the field effect transistor Q1 and one end of the voltage dividing resistor R1, the source electrode of the field effect transistor Q1 is connected to the load system and the input terminal of the voltage sampling circuit, the other end of the voltage dividing resistor R1 is connected to the source electrode of the field effect transistor Q2, the output terminal of the voltage sampling circuit is connected to the grid of the field effect transistor Q2, and the drain electrode of the field effect transistor Q2 is grounded. Through the integration circuit and the field effect transistors, the load capacity is ensured while the rapid overcurrent protection function is achieved at the same time, to avoid the power system from abnormal operation due to the load system short circuit or overcurrent.

Description

technical field [0001] The invention relates to the technical field of power supplies, and more specifically, to an overcurrent protection circuit, a power supply interface and a mobile terminal. Background technique [0002] At present, most smartphones use Type-C interface, which is a little more complicated than the previous Micro interface and has more pins. However, some Type-C data cables on the market cut corners, and the quality is not reliable. The power supply is short-circuited, and the protection time of some platforms exceeds 10 μS. In the case of a power supply short-circuit, the system will be shut down. Contents of the invention [0003] The main purpose of the present invention is to propose an overcurrent protection circuit, a power interface and a mobile terminal. Through the integral circuit and the field effect tube, while ensuring the load capacity, the fast overcurrent protection function can be realized, and the short circuit of the power supply sys...

AI Technical Summary

Problems solved by technology

[0002] At present, smartphones mostly use Type-C interface, which is a little more complicated than the previous Micro interface and has more pins. However, some Type-C data cables on the market cut corners, and the quality is not reliable. The power supply is short-circuited. Some platforms take more than 10 μS to start protection. In the case of a power supply short-circuit, it will cause the system to shut down

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