《电力电子技术》课程教学课件（PPT讲稿）Topic 16 Thyristor and Thyristor control circuit、Thyristors Rectifiers

Topic 16Main contentsThyristor and Thyristor control circuitThyristors Rectifiers

Main contents • Thyristor and Thyristor control circuit • Thyristors Rectifiers Topic 16

2-3 Thyristors (SCRs)In some applications such as battery chargers anddc motor drives it is necessary for dc voltage to becontrollable. The ac to controlled-dc conversion isaccomplished by means of thyristors.cathode?anodegate

In some applications such as battery chargers and dc motor drives it is necessary for dc voltage to be controllable. The ac to controlled-dc conversion is accomplished by means of thyristors. 2-3 Thyristors (SCRs)

Thyristors, usually be called “Silicon ControlledRectifiers (SCR)”:ThyristorOpenedthepowerelectronics era1956,invention,Bell Laboratories1957, development of the 1st product, GE1958,1st commercialized product, GEThyristor replaced vacuum devices in almost everypowerprocessing area.Still used in very high power levels such as utilityapplications. Thyristor still has the highest power-handling capability

Thyristors, usually be called “Silicon Controlled Rectifiers (SCR)” . Thyristor Opened the power electronics era 1956, invention, Bell Laboratories 1957, development of the 1st product, GE 1958, 1st commercialized product, GE Thyristor replaced vacuum devices in almost every power processing area. Still used in very high power levels such as utility applications. Thyristor still has the highest power￾handling capability

(外形)1AppearancecathodeEOOanodeKGqtmtegateCathodeGateAnode

1 Appearance（外形） Cathode Gate Anode 4

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2Physicsofdeviceoperation（器件工作机理）（1)Reverse-blockingstate（反向阻断状态）：When a reverse (vAk<0) voltage is applied, the flowof current is blocked by the junctions J, and J3A?AP1JiJ1(N)QAN1JJ2Q20G'3G(N+)13N2JK6K10

2 Physics of device operation (器件工作机理) (1)Reverse-blocking state（反向阻断状态）: When a reverse (vAK<0) voltage is applied, the flow of current is blocked by the junctions J1 and J3 . 10