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一种商用车仪表干扰保护电路与设计方法

2021-01-16程春林周斌李文董琦飞

汽车科技 2021年6期

程春林 周斌 李文 董琦飞

程春林

毕业于哈尔滨理工大学,现就职于东风电驱动系统有限公司,任技术中心电子商品开发部主任工程师,主要研究方向为汽车电子电路可靠性分析与设计。已发表论文2篇。

摘要:本文针对一款商用车彩屏仪表系统电源电路的设计,为提升仪表抗干扰能力,抑制整车抛负载电压对仪表的冲击,从电源主芯片、TVS管选型等方面对方案的可行性进行分析,通过IS0 16750-2:2012沿电源线传导抗干扰Sa波形的实验对该方案进行了验证,并给出实验数据。实验及仪表批量应用三包结果证明,按该方法设计的仪表电源电路指标满足主机和国标实验要求,满足车辆安全行驶的需要且具有良好的电磁兼容性,对进一步实现不同类型汽车仪表抛负载瞬变电压保护电路的设计、改进和升级具有一定的指导和参考意义。

关键词:仪表;电路设计;抛负载;电磁兼容性

中图分类号:U463.7 文献标识码:A 文章编号:1005-2550( 2021) 06-0099-06 A Commercial Dehicle Instrument Interference Protection Circuit

and Design

CHENG Chun-Iin, ZHOU Bin, LI Wen, DONG Qi-fei ( Dongfeng Electric Drive System Co., Ltd. Technology Center, Xiangyang 441001, China)

Abstract: Aiming at the design of power supply circuit for a commercial vehicle colorscreen instrument system, in order to improve the anti-interference ability of the instrumentand restrain the impact of vehicle load voltage on the instrument, this paper analyzes thefeasibility of the scheme from the aspects of main power chip and TVs tube selection, andverifies the scheme by conducting anti-interference SA waveform along the power Iine in ISO16750-2:2012, The experimental data are given. The results of experiments and batchapplication of three guarantees show that the instrument power supply circuit designed by thismethod meets the requirements of host and national standard experiments, meets the needs ofvehicle safe driving, and has good electromagnetic compatibility. It has certain guidance andreference significance for further realizing the design, improvement and upgrading of loadthrowing transient voltage protection circuit of different types of automobile instruments.

Key Words: Instrument; Circuit Design; Throwing Load; Electromagnetic Compatibility

1 前言

儀表是汽车的主要显示界面,其功能是为用户提供实时的燃油、车速、发动机转速、水温等车辆信息显示,以及防抱死制动系统( Anti-IockBrake System,ABS)、电子制动力分配系统( Electronic Brake Force Distribution, EBD)等报警灯的显示。当车辆行驶过程中,仪表系统应该正常工作,并具有抵抗各种电磁骚扰的能力[1]。

据汽车电路保护专家Littelfuse公司的高级工程师戴泰初介绍,在汽车系统中,在各种汽车控制系统(如ABS、Airbag等)与发电机之间,会有一个蓄电池。正常情况下发电机给蓄电池充电,但是当线束老化或……

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