Home Questions Tags Users Unanswered. By using our site, you acknowledge that you have read and understand our Cookie Policy , Privacy Policy , and our Terms of Service. The total delay to commencement of IGBT turn-off is seen to be around ns. The experimental setup utilizes a 3-phase inverter powered from the ac mains through a half wave rectifier. Three typical short-circuit events are illustrated in Figure 1. Email Required, but never shown. Miller clamping on turn-on.

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Desaturation in IGBT : what does it really mean?

Equating complex number interms of the other 5. This is illustrated in Figure 7.

This will not generally result in IGBT destruction, ight it does increase power dissipation and compromises reliability. Our header files are static or dynamic library 1.

Some of the trade-offs in enhancing insulated gate bipolar transistor IGBT conduction loss are increased short-circuit current levels, smaller die size, and reduced thermal capacity and short-circuit withstand time. Care needs to be taken in implementing desaturation detection to prevent false tripping.

IGBT Overcurrent and Short-Circuit Protection in Industrial Motor Drives

That would be an indication of something bad happening and it would be time to switch it off fast but not too fast, or that itself could cause damage. All of these gate driver functions have a positive impact on overall system reliability and efficiency.


Ultrasonic transducer driver 1. Power semiconductor device manufacturers are continually pushing the boundaries of conduction loss and desaturtaion time improvements. He received his B. They say that when this Desaturation occurs, there is an increase in the collector potential: Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

IGBT Overcurrent and Short-Circuit Protection in Industrial Motor Drives | Analog Devices

IGBTs are not dwsaturation as a fail-safe component and their failure can result in a dc bus capacitor explosion and complete drive failure. Please Select a Language. Importantly, desaturation can also indicate a gate-emitter voltage that is too low and that the IGBT is not being fully driven to the saturation region.

Enough collector current and the device comes out of saturation. Dec 248: Hi Friends, Somehow, i do not understand this word completely. In Figure 6, the delay between the hardware trip signal, the PWM output signal, and cesaturation actual gate-emitter waveform of the upper IGBT in one of the inverter legs is shown.

Why I am getting this substrate picture, when i create a new workspace? He even had experimental data and waveforms, but unfortunately I don’t have permission to post them. Which is the deal? Analog Layout Finger Size 3. Does that mean the transistor go into Active region?


The short-circuit to earth is not tested in this example. Industrial motor drives can operate in a relatively harsh environment in which high temperature, ac line transients, mechanical ibt, miswiring, and other contingencies can occur. A market-wide trend in industrial motor drives is an increasing demand for higher efficiency coupled with increased reliability and robustness.

Andy aka k 10 For instance, a negative supply rail of —7.

I see no difference when using an IGBT. Spehro Pefhany k 4 There is an initial controlled overshoot of about 80 V above the V DC bus voltage due to the higher impedance in the turn-off during desaturation protection. The experimental setup utilizes a 3-phase inverter powered from the ac mains through a half wave rectifier. The curves on every IGBT data sheet I’ve seen show a typical junction drop relationship between voltage and current collector-emitter igbf the device is gated on.

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