This paper presents a theoretical analysis on the electromagnetic process of three-phase magnetic amplifier of the transductor type with bridge rectifieroutput circuit .
本文对工作绕组为串联或并联的三相扼流磁放大器（带桥式整流输出）的电磁过程进行了理论分析；
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Then the sensor output signal, amplified by the rectifier to change the coil current until the coil back to bit, its current strength and the object's gravity is called proportional.
The difference of output voltage of inverter and 220v is set as control signal, controller change the PWM signal to regulate buck-boost converter and three-phase rectifier.