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.

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该仪器的电路部分采用了线阵CCD进行光谱数据采集，采用USB接口进行通讯和系统供电。

The circuit of spectrometer used CCD for spectrum data collection, and used USB interface for communication and system's power.

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在硬件设计中对电压、电流采样电路，IGBT驱动电路以及通讯和人机接口电路进行了设计。

In part of hardware design, voltage and current sampling circuit, IGBT driving circuit communication and man-machine interface circuit are designed.

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