What is Desat protection?

The VCE(sat) detection (DESAT detection) circuit which detects the rise of the collector or drain voltage (VCE) when an over-current flows into the power semiconductor switch device (hereinafter referred to ‘power device’) driven by the gate driver by causes, such as a short circuit of load, makes the power device turn …

What is IGBT Desat?

During desaturation, the IGBT current and power dissipation rise drastically and the device overheats, possibly to failure. To prevent such damage, desaturation fault detection turns off the IGBT in a controlled manner. The IGBT collector-emitter voltage, VCE(SAT), is monitored by the DESAT pin of the coupler.

What is blocking voltage of IGBT?

Large IGBT modules typically consist of many devices in parallel and can have very high current-handling capabilities in the order of hundreds of amperes with blocking voltages of 6500 V. These IGBTs can control loads of hundreds of kilowatts.

How does desaturation protection work on an IGBT?

The longer it takes to turn an IGBT off the more energy will be dissipated. Below is the basic circuit for the IGBT control with desaturation protection, using a microcontroller is a lot more concise than using logic circuits.

Which is advanced gate driver for IGBTs and power MOSFETs?

This device is an advanced gate driver for IGBTs and power MOSFETs. Control and protection functions are included and allow the design of high reliability systems. The innovative active Miller clamp function eliminates the need for negative gate drive in most applications and allows the use of a simple bootstrap supply for the high side driver.

When does an IGBT and MOSFET over saturate?

IGBT and MOSFET Desaturation Protection When an IGBT or MOSFET are fully “on” they are known to be saturated, when they exceed their maximum current ratings they are known to “over saturate” which will eventually cause failure of the device.

Which is an example of IGBT overcurrent protection?

Examples of IGBT overcurrent protection techniques. Desaturation detection utilizes the IGBT itself as the current measurement component.