Overcurrent protection circuit module

Abstract

The invention discloses an overcurrent protection circuit module. The overcurrent protection circuit module comprises a current sampling circuit and an overcurrent protection delay circuit, wherein the current sampling circuit comprises a sampling circuit, a reference circuit and a comparator, output ends of the sampling circuit and the reference circuit are electrically connected with an input end of the comparator, the sampling circuit is used for detecting the size of a current in the circuit, the comparator is used for comparing a sampling value and a reference value and giving out an overcurrent signal when the sampling value is larger than the reference value, and the overcurrent protection delay circuit comprises an overcurrent protection time setting unit and an overcurrent loop MOS tube control unit and is used for controlling a MOS tube in an overcurrent loop and protection time. By the overcurrent protection circuit module, the problems of overcurrent, short circuit and thelike of a power supply are solved; and the circuit is simple, the protection time can be freely set, an auxiliary circuit is not needed to be additionally arranged, and the safety and the stability ofthe power circuit are improved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an overcurrent protection circuit module. Background technique [0002] As the power supply equipment of all electronic products, in addition to the performance that meets the requirements of power supply products, its own protection measures are also very important, such as overvoltage, overcurrent, and overheat protection. Once an electronic product fails, such as a short circuit on the input side of the electronic product or an overcurrent or short circuit on the output side, the power supply must turn off its output voltage to protect the power MOSFET and output devices from being burned, otherwise it may cause further damage to the electronic product. Damage, and even cause the operator's electric shock and fire. Therefore, the overcurrent protection function of the power supply must be perfect. The main disadvantages of the existing technology: ...

AI Technical Summary

Problems solved by technology

[0003] (1) A separate power supply is required, and a set of auxiliary windings needs to be added to the transformer of the power supply, resulting in an increase in the size of the transformer

[0004] (2) There are many components used and the circuit is complicated. Generally, the hiccup mode is used for protection, and the overcurrent protection time cannot be set arbitrarily

Images