Fully-integrated electric vehicle flasher driving chip

Abstract

The invention discloses a fully-integrated electric vehicle flasher driving chip. A CEXT capacitor charging module, a reference voltage source module, an oscillator, a logic control unit, an over-temperature protection circuit, an over-current protection circuit, a frequency division circuit and a power tube driving module are integrated in a driving chip; a VCC pin, an OUT pin, a BEEP pin and a CEXT pin are packaged outside the driving chip; a CEXT capacitor is connected between the CEXT pin and the OUT pin; a passive buzzer is connected between the BEEP pin and a battery power supply end; and a bulb is connected between the OUT pin and a grounding end. A clock circuit is integrated in a chip circuit, and therefore, a flashing frequency is stable, the function of a flasher; an overheatingturn-off protection function, a short circuit turn-off protection function and a post-protection self-recovery function are built in the driving chip; the direct-current withstand voltage of the chipcan reach 40 V; reliability is high; and the chip circuit only needs one peripheral 1 microfarad capacitor for power supply, and therefore, peripheral components are reduced, and the cost of the flasher is reduced.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle flashers, and in particular relates to a fully integrated electric vehicle flasher drive chip. Background technique [0002] The main modules of electric vehicles are generally divided into battery modules, control modules, motor modules and body shells. The control module is the core connecting the various modules of the electric vehicle, and its performance determines the function of the overall electric vehicle. Among the many control modules, the control module of the indicator light is a safety guarantee in the driving process, so the flasher control module must be more safe, reliable and stable in performance. Early flasher control modules have a large number of peripheral circuits, resulting in disadvantages such as high cost, high power consumption, short life, etc., which can no longer meet the needs of the current market. Because of its superior performance, the flasher chip c...

AI Technical Summary

Problems solved by technology

Among them, although the structure of the heating wire flasher is relatively simple and the production cost is low, the reliability of use is too low due to the large output frequency error and the degree of flickering of the turn signal is not obvious; although the capacitive flasher can complete small error Frequency output, but the working mode does not have high reliability; although the wing-type flasher occupies a small area, the output frequency error is small, and the working method is simple, but it generates a lot of noise; the electronic flasher has better working performance and stable output frequency

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