The advantages and disadvantages of a new generation of power devices IGBT, Yuan Sheng Da take you to understand

        In understandingIGBTBefore the pros and cons of this device, we need to understand how it works,IGBTWill be strong current, high voltage application and fastTerminal equipment Vertical powerMOSFETThe natural evolution ofIGBTThere areNChannel pattern sumPThere are two types of channel, the mainstreamNchannelIGBTThe circuit diagram symbols and their equivalent circuits are as follows:

So the whole process is simple:
When gridGFor high electric times,NMOSConduction, soPNPtheCEAlso conduction, current fromCEFlow through.
When gridGFor low electricity levels,NMOSCut off, soPNPtheCECut off. No current is flowing.

IGBTwithMOSFETDifferent, there is no parasitic reverse diode inside, so in practical use(Inductive load)Need to be paired with the appropriate fast recovery diode.

IGBTThe advantages are as follows:

1, with higher voltage and current processing capabilities.

2, very high input impedance.

3Can use very low voltage to switch very high current.4Voltage control device, that is, it has no input current and low input loss.

5The grid drive circuit is simple and cheap, which reduces the requirement of grid drive

6It can easily be turned on by applying a positive voltage and turned off by applying a zero or slightly negative voltage.

7, has very low on-resistance.

8, has a high current density, enabling it to have a smaller chip size.

9, property ratio BJT and MOS Tube for higher power gain.

10, property ratio BJT Higher switching speed.

11Low control voltage can be used to switch high current levels.

12, bipolar properties, enhanced conductivity.

13, safe and reliable.

IGBTThe disadvantages are as follows:

1, the switching speed is lower than MOSTube.

2Because it is one-way, it cannot be processed without additional circuitsACWaveform.

3, cannot block higher reverse voltage.

4Ratio, ratio BJT and MOSThe price is higher.

5, resembling a thyristorP-N-P-NStructure, so it has latching problems

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