智能型动态功率因数监测和补偿系统_孙海定.pdf

2007 17 256 # # 智能型动态功率因数监测与补偿系统 孙海定, 邴林林 ( 430074) :描述了基于单片机为控制核心的低电压动态功率因数监测与 偿系统该系统将 MOC3041 与可控硅 BT 137 结合作为 偿电容投入的控制开关, 同时利用 MOC3041 内部的过零比较器来实现延时控制作用, 成功解决了 偿电容投入 时可能产生的电流冲击问题在软件上采用PWM 技术,控制/ 开关0 通断时间及频率来改变 偿电容投入时的等效电容量, 使 偿电容量连续可调该电容 偿技术很好地实现了对当前电路稳定可靠精确的检测和控制 :单片机; 功率因数; 偿; PWM :T P23 : B : 1004- 373X( 2007) 17- 133- 04 System of Intelligent Dynamic Power Factor of Monitoring and Compensation SUN H aiding, BING inlin ( Electric Electronic Innovation Center of Science Technology,Huazhong U niversity of Science and Technology, Wuhan, 430074,China) Abstract: This paper mainly presents a system of an intelligent dynamic low voltage power factor monitoring and compen- sation based on t he single chip microcomputer. By using of a sw itch and a crossing- zero comparator,the system successfully solves the difficult problem of impulse current w hen the compensat ion capacitors are connected to the circuit. The sw itch, com- posed of MOC3041 and thyrister BT 137, controls shunt compensation capacitors connected to t he load. And t he crossing- zero comparator in MOC3041 realizes delay- time control for the sw itch.In softw are design, the system successfully uses PWM to control the switch on and off to change the equivalent capacitance of the com pensat ion capacitors ( and urge) , so that the capac- itance can be adjusted continuously. The method of compensation capacitors makes the system more stably, reliably and im- proves the accuracy of monitoring and compensation. Keyw ords: single chip microcomputer; pow er factor; compensation; PWM , , , , ,