Transcription of Chapter 5 Protection Circuit Design
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Chapter 5 Protection Circuit Design
Chapter 5 Protection Circuit Design 5-1 CONTENTS Page 1 Short Circuit (overcurrent) Protection .. 5-2 2 Overvoltage Protection .. 5-6 This section explains the Protection Circuit Design . Chapter 5 Protection Circuit Design 5-2 1 Short Circuit (overcurrent) Protection 1. 1 Short Circuit withstand capability In the event of a short Circuit , first the IGBT s collector current will rise, once it has reached a certain level, the C-E voltage will spike. Depending on the device s characteristics, during the short- Circuit , the collector current can be kept at or below a certain level, however the IGBT will still continue to be subjected to a heavy load, that is, high voltage and high current. Therefore, this condition must be removed as soon as possible. However, the amount of time allowed between the start of a short Circuit until the current is cut off, is limited by the IGBT s short Circuit withstand capability, which is determined by the amount of time, as illustrated in Fig.
protective circuit built in, thereby simplifying the drive circuit design. For more details, refer to Chapter 7 “Drive Circuit Design”. Fig. 5-4 shows an IGBT waveform during short circuit protection. + +
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