A fully integrated electric vehicle flasher driver chip

Abstract

The invention discloses a fully integrated electric vehicle flasher driver chip, which is integrated with 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, and a frequency division circuit. 1. Power tube drive module; the drive chip is packaged with VCC pins, OUT pins, BEEP pins and CEXT pins. There is a CEXT capacitor connected between the CEXT pin and the OUT pin, and between the BEEP pin and the battery power terminal. A passive buzzer is connected, and a light bulb is connected between the OUT pin and the ground. The chip circuit of the present invention integrates a clock circuit inside, has a stable flicker frequency, realizes the function of a flasher, has built-in overheating shutdown protection, short circuit shutdown protection and self-recovery function after protection, and the DC withstand voltage of the chip can reach 40V, with high reliability, and The chip circuit only needs a peripheral 1μF capacitor for power supply, which reduces the peripheral components and reduces the cost of the flasher.

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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