go to jove.com

HIGH SCHOOL

Engineering

Science Experiments

Engineering

This is a free preview. For full access

Electrical Engineering

Controlling SCR Half-Wave Rectification

Description

Thyristors, also called silicon controlled rectifiers (SCRs), are used to control current in a rectifier circuit. Like diodes, they let current pass from the anode to the cathode and block current in the opposite direction. Unlike a diode, a thyristor can be turned on with a gate terminal that receives a small current pulse....

Transcript

晶闸管(也称为硅控整流器,即SCR)是一种电子器件,常用于调光器、电机速度控制器和电压调节器中。与二极管类似,晶闸管具有阳极和阴极,仅允许电流单向导通。实际上,晶闸管的电路符号类似于二极管,但多出一个代表门极的第三端子,用于控制电流的通断。然而,与二极管不同的是,必须在门极施加一个微小的电流脉冲,才能将晶闸管导通,从而使正向电流从阳极流向阴极。当该正向电流降至保持阈值以下时,晶闸管将关断。在关断状态下,晶闸管在两个方向上均阻断电流导通。这种通断能力使晶闸管能够实现整流功能,即只允许单一极性的电流通过,并调节输送至负载的交流电功率。本视频将演示如何在交流电周期的不同相位触发门极,以实现对晶闸管的控制。

晶闸管由四层交替的P型和N型半导体材料构成,形成PNPN结构。阳极引线连接...

More videos by Standards