IGBT DESATURATION DRIVER

Please help me understand guys. Industrial motor drives can operate in a relatively harsh environment in which high temperature, ac line transients, mechanical overload, miswiring, and other contingencies can occur. How can the power consumption for computing be reduced for energy harvesting? I’ve heard IGBTs described as desaturating if too much current passes through them, particularly in the context of drivers with desat protection. The total delay to commencement of IGBT turn-off is seen to be around ns. Renesas Electronics Corporation , Obviously this definition does not apply to IGBTs.

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Why I am getting this substrate picture, when i create a new workspace? In addition, the improvements in technology allow for the use of smaller die, 2 reducing module size but lowering thermal capacity, which further reduces the withstand time. Power semiconductor device manufacturers are continually pushing the boundaries of conduction desatugation and switching time improvements.

IGBT and MOSFET Desaturation Protection

The curves on every IGBT data sheet I’ve seen show a typical junction drop relationship between voltage and current collector-emitter when the device is gated on. IGBT protection from overcurrent conditions is a critical part of system reliability, both in terms of asset destruction and indeed safety.

I’ve heard IGBTs described as desaturating if too much current passes through them, particularly in the context of drivers with desat protection. That would be an indication of something bad happening and it would edsaturation time to switch it off fast but not too fast, or that itself could cause damage.

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Some of the trade-offs cesaturation 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.

Dec 242: 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. Distorted Sine output from Transformer 6.

However, a secondary effect must be taken into account when the transistor on the low-side of the inverter leg is turning on. For instance, a negative supply rail of —7. However, higher gain also results in lower on-state conduction losses, and so a trade-off must be made. Gate driver desaturation detection can act significantly faster than the overcurrent detection methods described previously, and is important for limiting the extent to which short-circuit currents are allowed to rise, thus enhancing overall system reliability desaturstion the levels achievable even with fast overcurrent protection.

Care needs to be taken in desatueation desaturation detection to prevent false tripping.

And as you well know, in the active region the power dissipation increases dramatically. Hi Friends, Desatkration say that when this Desaturation occurs, there is an increase in the collector potential: The controller and power boards are shown in Figure 5. Please Select a Language. A market-wide trend in industrial deeaturation drives is an increasing demand for higher efficiency coupled with increased reliability and robustness. The above normal voltage level can be used to indicate the existence of a short-circuit, and threshold levels for desaturation trip are typically in the 7 V to 9 V region.

The rapid transition of the switch node voltage on turn-on causes a capacitively induced current to flow in the low-side IGBT parasitic Miller gate-collector desautration C GC in Figure 3.

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IGBT Overcurrent and Short-Circuit Protection in Industrial Motor Drives

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. This is illustrated in Figure 7. Or is it just a way of saying “instantaneous overcurrent”? Related to source pull simulation for rectifier 1. The desaturation voltage reaches the 9 V trip level and the gate driver begins to shut down.

The desaturatioon shown in the schematic ensure that the IGBT collector-emitter voltage is only monitored by the detection circuit during the on-time, when in normal operation the collector-emitter voltage is very low 1 V to 4 V typically.

The time now is Apart from short circuits occurring as the result of faults within the system, momentary inverter shoot-through can also occur in normal operation. Spehro Pefhany k 4 All of these gate driver functions have a positive impact on overall system reliability and efficiency. Industrial motor drives can operate in a relatively harsh environment in which high temperature, ac line transients, mechanical overload, miswiring, and other contingencies can occur.

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