基于可控硅的流可调变压器.doc

[摘要] 目前使用的交流可调电压源,普遍是改变自耦变压器滑动触点位置的调压方式。其调压精度低，响应速度慢，结构复杂,可靠性差。本设计将探求一种新型交流调压稳压技术，用一片89C51单片机作控制器，通过采用整周波过零关断和触发技术，对自耦变压器的次级不等量输出。绕组用双向可控硅进行组合控制，从而输出可调交流电压，由于没有滑动触点且可控硅采用过零触发，输出的交流电压波形是连续不断，且几乎不失真的，也不产生高次谐波的空间辐射。 [关键词] 单片机；过零触发；可控硅开关；交流调压 [Abstract] At present the use of the exchange adjustable voltage source, the general is to change the auto-transformers sliding contact location of the surge way. Surge of its low accuracy in response to slow, complex structures, poor reliability. The design will explore a new type of exchange regulator regulator technology, with a 89 C51 microcontroller for the controller, through the use of the whole cycle off and on the trigger, the auto-transformer sub-ranging output. Winding with two-way combination of SCR control, output voltage adjustable exchange, in the absence of sliding contact and the use of SCR is triggered, the output voltage of the exchange was continuing, and really almost yet, nor have a high Harmonic space radiation. [Key words] MCU ；zero trigger SCR Abstract: the present uses exchange adjustable potential source, is generally the change presses the way from the pair transformer sliding contact position accent. Its accent presses the precision to be low, the speed of response is slow, the structure is complex, the reliability is bad. This design will seek one kind of new exchange accent to press the constant voltage technology, makes the controller with a piece of 89C51 monolithic integrated circuit, through uses the entire cycle zero crossing shutdown and the triggering technology, to from pair transformers secondary not isometric output. The winding carries on the composite control with the bidirectional silicon-controlled rectifier, thus outputs the adjustable alternating voltage, because does not have the sliding contact and the silicon-controlled rectifier uses zero crossing triggering, the output alternating voltage profile is continuously, and nearly not distorted, also does not produce the higher harmon