Chapter 2 Overview of Power Semiconductor Devices. Introduction Diodes Thyristors Ideal switches Bipolar transistors MOSFETs MOS-Controlled Thyristors Comparison of controllable switches. Thyristors. Semi-controlled device Latches ON by a gate-current pulse if forward biased - PowerPoint PPT Presentation
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Chapter 2 Power Semiconductor Switches: An Overview
2-8
Generic Switch Symbol
• Idealized switch symbol• When on, current can flow only in the direction of the arrow• Instantaneous switching from one state to the other• Zero voltage drop in on-state• Infinite voltage and current handling capabilities
Chapter 2 Power Semiconductor Switches: An Overview
2-10
• Small leakage current in off state• Small on state voltage• Short turn-on and turn-off• Large forward and reverse voltage• High on state current rating• Positive temperature coefficient• Small control power required to switch• Capability to survive rated voltage and rated current simultaneously
Chapter 2 Power Semiconductor Switches: An Overview
2-16
MOSFETs #1
• Easy to control by the gate• Optimal for low-voltage operation at high switching frequencies• On-state resistance a concern at higher voltage ratings