张续凯　张文明　周海勇

摘 要:根据电涡流测功机试验过程中的技术要求,设计了一种直流线性稳压电源。基于可控整流电路并结合模拟电子技术设计,采用晶闸管三相桥式移相控制和功率MOSFET调整两个控制环联合控制的方法,输出可调的线性直流电压。设计了过载保护电路、缺相保护电路、过热保护电路等措施,以保障设备的正常使用。经连续负载试验,该设备输出电压线性可调,输出电压稳定度符合电涡流测功机要求。在系统过载、输入三相电源缺相以及设备过热等模拟故障条件下均可迅速切断电源。采用晶闸管三相桥式移相控制和功率MOSFET调整两个控制环联合控制方法设计的电源可以满足电涡流测功机对加载器输入电压的要求。

关键词:电涡流测功机;直流线性稳压;二级电压控制;模拟故障

中图分类号:TP274文献标识码:B

文章编号:1004-373X(2009)10-189-04

New Type of High-power Linear DC Voltage-stabilized Power

Source in Eddy Current Dynamometer

ZHANG Xukai,ZHANG Wenming,ZHOU Haiyong

(Shanghai Internal Combustion Engine Research Institute,Shanghai,200438,China)

Abstract:A new type of power source used for excitation voltage control in eddy current dynamometer in designed.Based on the SCR rectification circuit and analog technology,using the fully three phase position controlled bridge of SCR and power MOSFET regulation to output linear DC voltage.Over-load protection circuit,open-phase protection circuit and thermal-shutdown circuit are designed for equipment reliability.Experimental results show that the equipment can output linear DC voltage and the voltage stablilty fulfil the needs of eddy dynamometer.The equipment also can quickly shutdown when at fault status such as over-loads,open-phase and overheat.The power source designed by the fully three phase position controlled bridge of SCR and power Mosfet regulation can fulfil the needs of voltage of eddy dynamometer.

Keywords:eddy dynamometer;DC linear voltagecd

stabilized;secondary voltage control;analog fault

测功机是发动机台架检测系统中重要的组成部分,用于测量发动机的有效功率。对测功机来讲,为了满足发动机所有转速和负荷范围内都保持稳定运转工况,并且可以平顺且精细地调节负荷,需要一个稳定的加载器来满足发动机实验的要求,需要对加载器提供稳定且可线性变化的电源。在电涡流测功机中,需要对励磁电机提供的直流电源进行驱动,以完成发动机台架检测。

由于电涡流测功机励磁电机要求磁场恒定,故要求电源提供的负载电压恒定不变,而且磁场一般都是稳定的,还要求有较好的电压稳定度,即要求即使输入电压发生一定变化时,输出电压应保持不变。……