principal voltage

The arc current and arc voltage are the input of the electrode controller which is the principal section of the electric arc furnace control system. It is the premise of assuring the normal working of electrode controller that arc current and arc voltage are measured accurately.

电弧电流和电弧电压是电弧炉控制系统最重要环节电极控制器的输入，精确测量电弧电流和电弧电压是保证电极控制器正常工作的前提。

Although small driving voltage could be obtained, NG FED structure is not suitable for thick film process considering of the process and working principal. So it is difficult to cut down the fabrication cost, which is essential for large panel display.

虽然前栅极结构可以获得较小的驱动电压，但是无论从工艺制造还是器件工作特性方面考虑，均不适合采用厚膜制造工艺，因此这种结构不易降低制造成本，在大屏幕显示的应用方面非常困难。

Under current, over voltage, overload protection function, DSS, quasi-resonant mode, jitter period principal were all analyzed.

分析了准谐振模式变换器中的欠电流 、 过电压 、 过载保护等功能 、 动态自供电(DSS) 、 准谐振工作、跳跃周期工作原理.