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'集成化直流空压机调速电路道理剖析'

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'集成化,直流,空压机,调速,电路,道理,剖析,'

'集成化直流空压机调速电路，由晶闸管触发脉冲形成电路、PI 调治器及电源电路组成把持电路，由晶闸管功率把持电路组成主电路。 把持电路由专用集成电路N1(KJ004)、N2(KJ042) 和调治器'

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'2019-10-30 09:18:05'

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'<p>集成化直流空压机调速电路，由晶闸管触发脉冲形成电路、PI 调治器及电源电路组成把持电路，由晶闸管功率把持电路组成主电路。</p><p>把持电路由专用集成电路N1(KJ004)、N2(KJ042) 和调治器模块N3(KJTQM) 等构成。</p><p>晶闸管触发脉冲形成电路由N1、N2 等构成，此中，N1形成移相触发脉冲，N2 实现脉冲列调制。</p><p>同步电压取自电源变压器T1的二次侧，经R、R2、C 滤波后，加至N1的输进端(8脚)，经N1的内部电路作用，在其形成锯齿波电压UC。</p><p>UC和移相电压及偏移电压在入行综合比力，再经放年夜，在N1的3脚形成定宽度(宽度由Cn 的值决议) 的触发脉冲送至N2 的2脚。</p><p>N2 将N1送来的触发脉冲实施5~10kHz 的调制后从8脚输出脉冲列到N1的脚。</p><p>这时N1的输出端(D、5脚) 输出的是经调制的脉冲列移相脉冲。</p><p style="text-align: center;"><img alt="空压机脉冲经晶体管" src="2018/1228/841.jpg" /></p><p>这个脉冲经晶体管VT3放年夜及脉冲变压器T2 耦合后驱动晶闸管VS1、VS2 事情，使晶闸管的导通角随输人的移相电压的变化而变化，到达调压调速之目标。</p><p>该电路的触发极性为正，即移相电压增添，输出导通角增年夜。</p><p>电路中a~g点的事情电压波形，PI调治器由N3(F747) 构成。N3 内部为两级放年夜器， 第一级N3A 为电压(或速率) 负反馈，第二级N3B为电流负反馈。</p><p>第一级为电压负反馈或速率负反馈(经由过程变动连线可转换)。给定电压从l5V电源经Rm分压获得，经由过程移相电路参加。</p><p>电压负反馈旌旗灯号取自空压机两头，经RZ、R组成的分压器加到整流桥的输人端(如用速率反馈，其交换旌旗灯号可经整流桥整流成正电压加人)。</p><p>Rm是比例系数调剂电位器，R是第一级负向输出幅度调治电位器，可依据须要调剂。</p><p>第二级为电流负反馈。电流负反馈旌旗灯号由空压机归路所接电流取样电阻R2取得正电压，从电流反馈输进端经R2r参加，反馈的巨细由电位器RP调治。</p><p>RPS是比例系数调治电位器，Rp是第二级负向输出幅度调治电位器，可依据使用须要入行调剂。</p><p>第二级运算放年夜器中引出点a、b的作用是: 打消电容C2上的残余电压(经由过程在未起动前用继电器的动断触点短接，起动时使其断开来实现)，以使1kW 以上的直流空压机调速时光滑起动。</p><p>电压负反馈和速率反馈的转接方式: 为速率反馈接线，速率反馈交换旌旗灯号直接从整流桥输进端输进。</p><p>电压反馈时，将输进旌旗灯号从整流桥两个输人真个任一端(图中虚线所示) 到地输进，并将电位器RP的中央抽头R33改连至R4O。</p><p>该电路合用于4kW 以下直流空压机调速。若直流空压机功率在1kW 以下时， 可以不加电抗器; 若在1kW 以上时，必需加用电抗器。</p><p>若主归路有电源变压器等电抗元件时，可斟酌不加电抗器。</p><p>如输出脉宽分歧适，可调治电容Cn 的数值使之切合要求。</p>'

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'集成化直流空压机调速电路道理剖析_知识百科_技术中心_复盛空压机(华北)总代理'

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