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三相半波可控整流电路是一种通过调节可控硅导通角度来实现半波整流的电路。在电阻负载下,当可控硅导通的角度为α=45°时,其波形图如下:![image](cdn.luogu.cn/upload/image_hosting/8gnsvvfx.png)在整个周期内,可控硅只有在正半周期(0~π)内导通,电压呈周期性的半波整流形态,导通角度为45°时电压峰值的1/√2。在不导通的负半周期(π~2π)内,电阻负载中没有电流通过,因此电压为0。因此,在该电路中,输出的直流电压会随着可控硅导通角度的变化而不同。