推挽正激式高频环节逆变器研究
图 3.9 SPWM控制逆变器的方框图........................................................................32
图 3.10电压电流双闭环控制逆变器简化系统模型图...........................................33
图 4.1逆变器结构示意图.........................................................................................36
图 4.2基准正弦波发生器电路图.............................................................................38
图 4.3阶梯波合成示意图.........................................................................................38
图 4.4阶梯波合成分压示意图.................................................................................39
图 4.5 SPWM控制生成调制信号电路示意图........................................................41 图 4.6推挽正激功率开关管S2的驱动信号产生电路............................................42
图 4.7吸收回路驱动信号产生电路.........................................................................42
图 4.8逆变桥控制信号产生电路.............................................................................43 图 4.9逆变桥功率开关S1～S7驱动电路................................................................43
图 4.10 PM磁芯示意图............................................................................................44
图 4.11滤波等效电路和幅频特性...........................................................................47
图 4.12空载时滤波电感电流、滤波电容电压、吸收电容电压波形...................49
图 5.1基准电压、载波和正弦脉宽调制波形.........................................................51
图 5.2各个功率管驱动信号.....................................................................................52
图 5.3各种负载情况下输出电压和电流波形.........................................................54
图 5.4阻性负载时系统外特性.................................................................................55
图 5.5阻性负载时系统效率曲线.............................................................................55
表 4.1 PM62×49磁芯尺寸.....................................................................................................45 表 5.1输入电压为额定值27VDC时的试验数据...............................................................54
VI
