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Secondly, the operating principle and the mathematical model and the control method about the three-level voltage source high power factor PWM converter are analysed .The generation of the PWM trigging pulse control signal are introduced emphatically. On the basis of this, the hardware experimentation circuits are built with DSP and CPLD, and the trigging pulse signal is generated exactly. The feasibility of the circuit is verified by the experiment result.

其次，分析了三相电压型变流器的原理、模型、控制方法并着重研究其PWM 触发脉冲控制信号发生技术，并以DSP、CPLD 等芯片搭接了硬件试验电路，产生了正确地触发脉冲信号，试验结果证明了设计的合理性。

Main control circuit adopts electric controlled to exchange electronic switch technology and passing zero detection techniqueing advanced electronic device, which realize to pass zero level and smooth to its cutting ,shuting floodgate and bludgoning into , no over voltage when operating it , there is no electric arc to fire again to shove to have to throw condenser bank, condenser need is it can come into operation again to discharge, its cutting restriction of number of times to throw.

主控制电路采用电力电子器件可控交流电子开关技术和先进的过零检测技术，实现电容器组的过零平滑投切、无合闸涌流冲击、无操作过电压、无电弧重燃，电容器无需放电即可重新投入使用，并且不受投切次数的限制。

The result shows that higher voltage gradient supplemented with proper mechanic pressure is beneficial to electro-osmotic dewatering ; and optimization of operating condition can result in reducing energy consumption.

城市污水厂污泥的电渗透脱水技术具有脱水效果好的特点，但能耗较高，为此考察了电压梯度、泥饼厚度和机械压力等操作条件对脱水效果的影响。

In the course of design and analysis for Buck DC/DC converter, it is very important to analize the output voltage ripple formed in operating.

在Buck DC/DC变换器的分析与设计中，对开关工作时所形成的电压纹波的分析是至关重要的。

The ZU4T Series electric pumps, which weigh between 32-36kg, employ a p1.25kW universal motor that provides a high power-to-weight ratio and excellent low voltage operating characteristics, the company says.

据公司介绍，ZU4T系列的电动泵，重量在32-36kg之间，使用p1.25kW的通用式电动机，可以提供很高的重力/电力比以及极好的低压运行特性。

Dynamic large-signal, DC, and small-signal circuit models including parasitic resistances and current ripples of nonideal synchronous rectifier buck converter operating in CCM are established. Closed-loop modeling of nonideal synchronous rectifier buck converter for voltage-mode control is studied. Transfer functions are obtained. Effects of parasitic components on control loop design of the converter are explored. Systematic simulation analysis is performed. All the results show that it is necessary to include parasitic components of converters into equivalent models.

首次建立了考虑寄生电阻和电流纹波的同步整流 Buck 变换器在连续工作模式下的大信号平均模型、DC 和小信号电路模型，研究了电压控制的闭环建模，导出了传递函数，剖析了变换器的寄生参数对其控制电路设计的影响，进行了小信号特性的仿真研究，进一步阐明了考虑变换器的寄生参数建模的必要性。

Eatures · Compatible with MCS-51 Products · 2K Bytes of Reprogrammable Flash Memory – Endurance: 1,000 Write/Erase Cycles · 2.7V to 6V Operating Range · Fully Static Operation: 0 Hz to 24 MHz · Two-Level Program Memory Lock · 128 x 8-Bit Internal RAM · 15 Programmable I/O Lines · Two 16-Bit Timer/Counters · Six Interrupt Sources · Programmable Serial UART Channel · Direct LED Drive Outputs · On-Chip Analog Comparator · Low Power Idle and Power Down Modes Description The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K Bytes of Flash programmable and erasable read only memory.

eatures ·兼容MCS - 51的产品·及2k字节的编程快闪记忆体-耐力： 1 000写/擦除周期·在2.7 V至6 V的操作范围·完全静态的运作： 0 Hz至24兆赫·两个层次的程式记忆体锁· 128 × 8位内部RAM · 15个可编程I / O线·两个16位定时器/计数器· 6中断源·可编程串行UART的频道·直接驱动LED产出·单晶片模拟比较·低功耗的闲置和掉电模式描述该AT89C2051的是一个低电压，高性能的CMOS 8位微机与及2k字节的Flash可编程和可擦除唯读记忆体。

The IGBT shortcircuit protection circuit with perfect performance is designed and studied on the basis of the principle of collector emitter voltage desaturation dectection and the limitation of IGBT shortcircuit safe operating area.

根据集电极退饱和检测短路原理及IGBT的短路安全工作区限制，设计出具有较完善性能的IGBT短路保护电路。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。