电气工程及其自动化专业英语 Chapter 3 Power Electronic Technology
94页1、Chapter 3 Power Electronic Technology,Section 1 Semiconductor Switches,Text,New Words and Expressions,Exercises,End,Transition of part of speech,Section 1 Semiconductor Switches,Semiconductor switches are very important and crucial components in power electronic systems. These switches are meant to be the substitutions of the mechanical switches, but they are severely limited by the properties of the semiconductor materials and the process of manufacturing.,Section 1 Semiconductor Switches,Switc
2、hing lossesPower losses in the power electronic converters are comprised of the switching losses and the parasitic losses. The parasitic losses account for the losses due to the winding resistances of the inductors and transformers, the dielectric losses of capacitors, the eddy and the hysteresis losses. The switching losses are significant and can be managed. They can be further divided into three components: (a) the on-state losses, (b) the off-state losses and the losses in the transition sta
3、tes.,Section 1 Semiconductor Switches,On-State LossesThe electrical switches conduct heavy current and have nonzero voltage across the switch in the on-state. The on-state power losses are given by,(3-1),The uson and if are respectively the switch voltage in the on-state and the forward current through the switch. For example, the typical power diodes and the power transistors have nearly 0.5 to l volt across them in the on-state. The forward currents can be hundreds to thousands of amperes. The
4、 on-state,Section 1 Semiconductor Switches,power losses are very significant. Off-State LossesThe electrical switches withstand high voltages and have nonzero leakage current through the switch in the off-state. The off-state power losses are given by,(3-2),Section 1 Semiconductor Switches,The usoff and ir are respectively the reverse bias voltage in the off-state and the reverse current through the switch. For example, the typical power diodes and the power transistors have high reverse voltage
5、s in hundreds to thousands of volts and microamps to milliamps through them in the off state. Transition-State LossesThe practical switching devices have limited capabilities of rate of voltage transition and the rate of current steering. These nonabrupt transition rates,Section 1 Semiconductor Switches,give rise to power losses in the switching devices. We will examine these switching losses in two cases separately: the inductive and capacitive loads. Switching with Inductive LoadThe inductor i
《电气工程及其自动化专业英语 Chapter 3 Power Electronic Technology》由会员飞***分享,可在线阅读,更多相关《电气工程及其自动化专业英语 Chapter 3 Power Electronic Technology》请在金锄头文库上搜索。
人教版一年级下册数学第二单元20以内的退位减法测试卷精品【考试直接用】
人教版一年级下册数学第二单元20以内的退位减法测试卷(实用)word版
人教版一年级下册数学第二单元20以内的退位减法测试卷及答案(夺冠)
人教版一年级下册数学第二单元20以内的退位减法测试卷(典型题)
人教版一年级下册数学第二单元20以内的退位减法测试卷精品(a卷)
人教版一年级下册数学第二单元20以内的退位减法测试卷及答案【精品】
部编版二年级上册道德与法治期中测试卷 (考试直接用)
部编版二年级上册道德与法治期中测试卷 带答案(培优)
部编版二年级上册道德与法治期中测试卷 含答案(精练)
部编版二年级上册道德与法治期中测试卷 及答案【各地真题】
部编版二年级上册道德与法治期中测试卷 及完整答案【名校卷 】
部编版二年级上册道德与法治期中测试卷 【考点精练】
部编版三年级上册道德与法治期末测试卷 (重点)
部编版三年级上册道德与法治期末测试卷 (模拟题)word版
部编版三年级上册道德与法治期末测试卷 附答案(预热题)
部编版三年级上册道德与法治期末测试卷 附参考答案(b卷 )
部编版三年级上册道德与法治期末测试卷 答案下载
部编版三年级上册道德与法治期末测试卷 含答案【夺分金卷 】
部编版三年级上册道德与法治期末测试卷 含完整答案【网校专用】
部编版三年级上册道德与法治期末测试卷 及答案(最新)
2024-02-20 37页
2024-02-20 62页
2024-02-10 31页
2024-02-02 50页
2024-02-02 16页
2024-02-02 21页
2024-02-02 23页
2024-02-02 26页
2024-02-02 26页
2024-02-02 25页