随后，本文给出了380V电源供电的二电平变频加热电源的主电路和控制电路的设计与实现。
Secondly, the paper designs and realizes the two level variable frequency heating power supply with line of 380V.
然后分别介绍控制电路和主电路设计原理与思路，重点论述了混合电平逻辑设计中的接口解决方案、A/D采样电路、SPI通讯接口电路及主电路的保护等；
The key points lies in interface resolve method in hybrid voltage-logic design, A/D sampling circuit, SPI communication port and the protect of the main circuit.
该系统主电路采用三电平PWM变频器，以16位单片机80 98为核心组成数字控制系统，并采用空间电压矢量法的控制方法。
The device uses three-level PWM transducer as the main electric circuit of the system, 16 bits CPU 8098 as the the core of the digital control system.
DSTATCOM采用预测电流控制的双环控制方法和三电平逆变器的主电路设计。
DSTATCOM is designed with double loop control method of predictive current and 3-level inverter for its main circuit.
DSTATCOM采用预测电流控制的双环控制方法和三电平逆变器的主电路设计。
DSTATCOM is designed with double loop control method of predictive current and 3-level inverter for its main circuit.
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