一种新型电容储能焊机的电路设计

Design of circuit about new capacitor stored energy spot welding machine

关键词:  电容储能焊机  斩波器  超级电容

Key words:  capacitor stored energy spot welding machine  chopper  super capacitor

摘要:

介绍了一种新型电容储能焊机的电路系统设计。储能电容采用超级电容,由其组成低压的大容量电容器组结构代替传统的高压电容器组;充电电路采用直流斩波充电方式,其中斩波电路采用Buck降压变换器,IGBT为主功率开关器件,SG3525为PWM控制芯片,SKHI22AH4为驱动电路,引入电流负反馈实现恒电流充电;放电电路利用大功率晶闸管的浪涌特性,采取通过晶闸管放电开关直接大电流放电的方法;以80C552单片机为主控芯片的控制系统控制焊机的工作流程,实现焊接自动化。所研制的焊机已经成功应用于生产,焊接效果良好。

Abstract:

This paper introduces the design method of a new capacitor stored energy spot welding machine. The new power uses super capacitor to form low voltage capacitor groups instead of high voltage one.The capacitor is charged with direct current chopper circuit, which takes IGBT as the main power machine piece, SKHI22AH4 as the drive circuit, SG3525 as the control chip for PWM, and current feedback in order to get the constant current. In the discharge circuit, the large current is discharged directly through large power SCR without the welding transformer. For the software, 80C552 is the main control chip of the controlling system, so the welding machine could work automatically.The new machine designed has already been used in production and the fine effect was gained to improve the welding quality.