Three-crystal overcurrent protection type A circuit voltage regulating chip in unloading low-overvoltage zone

Abstract

A three-crystal overcurrent protection type A circuit voltage regulator chip in the load dump low overvoltage region, including: the emitter of the first transistor Q1 is grounded, the collector of Q1 is connected to the positive pole B+ of the power supply through the resistor R1, and the collector is also connected to the third transistor The gate of Q3 is connected to the input terminal of the energy storage delay unit 5; the source of the transistor Q3 is grounded E, and its drain is connected to the collector of the second transistor Q2, and the base of the transistor Q2 is connected to the output terminal of the energy storage delay unit 5, and the energy storage delay unit The ground terminal of 5 is grounded, the emitter of transistor Q2 is connected to the base of transistor Q1 through the threshold adjustment unit 4, and the drain of transistor Q3 is the excitation terminal F; the sampling unit 7 is connected to the positive pole of the power supply and the ground, and its output terminal is connected to transistor Q1 through the reference unit 8 The freewheeling unit 9 is connected between the excitation terminal and B+; it has simple chip circuit, high withstand voltage, overcurrent protection function, good temperature resistance, low load dump overvoltage zone, low cost, and wide application range , The advantages of high reliability.

Description

technical field [0001] The invention belongs to the technical field of automobile generator control, and relates to a three-crystal overcurrent protection type A circuit voltage regulation chip in a load dump low overvoltage region. Background technique [0002] Automobile generators work in special working environment conditions with wide temperature range, long baking time at high temperature, large vibration, large electromagnetic interference, and large voltage fluctuation. [0003] Among them, the vast majority of current automobile generators are built-in voltage regulator structures, requiring generator voltage regulators to adapt to the above-mentioned relatively harsh working environment, and it is difficult for general electronic components and circuits to operate in such a large temperature range. , Long-term stable work in the environment of high temperature for a long time. Practice has shown that many electronic chips of voltage regulators have vicious failure...

AI Technical Summary

Problems solved by technology

This poses a greater threat to electronic modules such as generator stator windings, rectifier bridges, voltage regulation chips, electrical equipment, especially computer boards, and instrument panels. It is best to install overvoltage absorbing (peak chopping) components inside each module, such as setting TVS, etc., but in actual vehicle operation, many electronic modules are still broken down by overvoltage, and many electronic modules are expensive and bring If the vehicle fails or breaks down during operation, driving safety is affected. One of the root causes is to optimize the excitation of the generator to reduce the probability of failure at the source.

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