电力电子技术的特点具体内容

12：BCD
13：C
14：ABCD
15：这个题有问题,不准确,如果一定要选择,那就选AB
16：B
17：看不清题意,器件的损耗应该有开关损耗和通态损耗两部分,频率越高,开关损耗比重越大.
这是什么老师出的题?感觉不是很懂电力电子.
19：ABD
20：ACD
21：A
22：B

这个真心不太好翻,主要是中英文不太好对,我又不懂.但素,还是做到了~~
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Course Description:
This course familiarizes the students with basic power switch technology and associated electronic circuits. In this course power electronic circuits and switching devices such as power transistors, and their applications in AC/DC, DC/DC, DC/AC and AC/AC converters as well as switching power supplies are studied. .Students are expected to analyze, model, and predict the performance of basic power converter configuration, and to explain the power electronics topologies and to design proper switching circuits
Course main content:
•Power Semiconductor Devices
•AC to DC (rectifier)
•DC/AC Inverter
•DC/DC Converter
•AC/AC Voltage controller
•switch mode power converters, motor drives & their control

Power electronic technology has developed into a complete and independent system technology which power supply technology belongs to and the development of it led to the growth of power supply technology that effectively promoted the development of the power industry.So far,Power supply has become a very important basic technology and industry,and has been widely used in various fields.It tends to develop with high frequency,high efficiency,low voltage,great current and multiplication.This paper talks about the development of modern power technology,attaches an importance to the development of switching power supply and its application fields,and at last analyses the basic principle of it.
自己翻译的,绝对没有语法错误!

题的解答是按照安全裕量来计算的,所以乘了1.5或2倍,得出95.55,选择100A.但是题目里确实写的是“不考虑安全裕量”,所以答案应当是63.7

1、不能正常放大,问题出在C1上,因电容相对于交流信号可以看成短路的,所以C1把三极管BE电位拉低到零,不满足三极管发射结正偏压了.
2、(A+B)(B+C)(C+A)=(AB+AC+B+BC)(C+A)=ABC+AB+AC+BC=AB+BC+AC
3、Uo=（-1）（R3/R2）Ui

In recent years, as servo motor technology, power electronic technology and computer control technology development makes the servo control system toward control circuit operation.this digital and the modular direction. And MCU use technology has also gradually mature, in various fields can be widely used. This paper introduces the AT89C51 as control core dc servo control system, and the working principle of hardware design and software design from two aspects of dc servo control system is introduced the idea and method of design, it includes the main program design, given a program design, modify the program design, start programs design and T0 interruption program design and PWM system driver circuit design and its relevant protection circuits. Through quantitative and feedback to the amount of compare and PID control procedures, the output of certain voltage, to implement the accurate tracking system to position

1、处理对象为高电压,大电流,强功率.
2、处理的内容为电能的相关转换,包括AC-DC转换,AC-AC转换,DC-DC转换和DC-AC转换.
3、处理的方式采用弱点控制强点
4、其应用范围广泛分布与各个生产生活环节.
5、整个课程具有电路多,波形图多,公式多等特点.

中间用到了个代换,在V导通时候,Uc1与UL2等值相反

待逆变就是电力电子器件(如晶闸管)已经满足逆变工作的部分条件,但并是完全满足条件,使得逆变并不能真正得以进行.比如此时晶闸管的控制角已推到逆变区（>90度）,但如果此时逆变的直流电势仍小于电网的电压,则逆变并不能进行,此时的状态就叫待逆变状态,简称待逆变.直到逆变的直流电势大于电网的电压后,逆变才能真正进行.
同样待整流也是一样,指已部分满足整流的工作条件,整流并未真正进行时的工作状态.

高手支招啊,我也不清楚.我认为是LB太小按照高数的知识可以忽略吧