# Insulated gate bipolar transistor igbt theory and design pdf

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### The IGBT Device Physics, Design And Applications Of The

IGBT is a voltage controlled semiconductor which enables large collector emitter currents with almost zero gate current drive. In the above image the equivalent circuit of IGBT is shown. In case of the BJT, we calculate the gain which is denoted as Beta , by dividing the output current by the input current.

Thus the gain is the ratio of output voltage changes with the input voltage changes. This is true for the IGBT. In the above image, symbol of IGBT is shown.

The three terminals are shown as Gate, collector and Emitter. Same thing happens for the BJT transistor. The difference between Gate to Emitter voltage is called as Vge and the voltage difference between collector to emitter is called as Vce.

As the current flow is relatively same in both collector and emitter, the Vce is very low. IGBT is mainly used in Power related applications. IGBT applications are vast in electronics field. Due to low on resistance, Very high current rating, high switching speed, zero gate drive, IGBTs are used in High power motor control, Inverters, switched mode power supply with high frequency converting areas.

In the above image, basic switching application is shown using IGBT. The voltage difference across the load is denoted as VRL. The load can be inductive also. And on the right side a different circuit is shown. The load is connected across collector where as a current protection Resistor is connected across the emitter.

The current will flow from collector to emitter in both cases. On the right side circuit, the current flowing through the load is depends on the voltage divided by the RS value. In the above image, I-V characteristics are shown depending on the different gate voltage or Vge.

The X axis denotes collector emitter voltage or Vce and the Y axis denotes the collector current. During the off state the current flowing through the collector and the gate voltage is zero. When we change the Vge or the gate voltage the device goes in to the active region. Stable and continuous voltage across gate provides continuous and stable current flow through the collector.

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## Insulated Gate Bipolar Transistor

It consists of three terminals with a vast range of bipolar current carrying capacity. It combines the best assets of both to achieve the optimal device characteristics. The applications of the insulated gate bipolar transistor include power circuits, pulse width modulation , power electronics, uninterruptible power supply and many more. This device is used to increase the performance, efficiency and reduces the audible noise level. It is also fixed in resonant-mode converter circuits. Optimized insulated gate bipolar transistor is accessible for both low conduction and switching loss. The insulated gate bipolar transistor is a three terminal semiconductor device and these terminals are named as gate, emitter and collector.

A comprehensive and "state-of-the-art" coverage of the design and fabrication of IGBT. All-in-one resource; Explains the fundamentals of MOS.

### Basic Construction of IGBT

An insulated-gate bipolar transistor IGBT is a three-terminal power semiconductor device primarily used as an electronic switch, which, as it was developed, came to combine high efficiency and fast switching. Although the structure of the IGBT is topologically the same as a thyristor with a "MOS" gate MOS-gate thyristor , the thyristor action is completely suppressed, and only the transistor action is permitted in the entire device operation range. It is used in switching power supplies in high-power applications: variable-frequency drives VFDs , electric cars , trains, variable-speed refrigerators, lamp ballasts, arc-welding machines, and air conditioners. Since it is designed to turn on and off rapidly, the IGBT can synthesize complex waveforms with pulse-width modulation and low-pass filters , so it is also used in switching amplifiers in sound systems and industrial control systems. In switching applications modern devices feature pulse repetition rates well into the ultrasonic-range frequencies, which are at least ten times higher than audio frequencies handled by the device when used as an analog audio amplifier.

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Two-dimensional numerical simulation of equivalent silicon insulated gate bipolar transistors IGBT and static induction thyristors SITh with a trench structure in the conductive and blocking states has been performed. Comparative analysis of the results has shown that the blocking characteristics of the SITh and IGBT are almost the same but breakdown voltage U b varies in the range of 1. The reason for this is the relatively low injection efficiency of the cathode emitter of the IGBT, leading to a strong decrease in nonequilibrium charge carrier concentration near the cathode and a corresponding increase of the field strength.

### Related subjects

IGBT is a voltage controlled semiconductor which enables large collector emitter currents with almost zero gate current drive. In the above image the equivalent circuit of IGBT is shown. In case of the BJT, we calculate the gain which is denoted as Beta , by dividing the output current by the input current. Thus the gain is the ratio of output voltage changes with the input voltage changes. This is true for the IGBT. In the above image, symbol of IGBT is shown. The three terminals are shown as Gate, collector and Emitter.

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Introduction So far, we have treated transistors as ideal switches An ON transistor passes a finite amount of current. Theory , Transistor , Cmos , Vlsi , Cmos transistor theory.

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Applications of IGBT. Main page. On 27 Jun, By qiso With 0 Comments. The insulated gate bipolar transistor IGBT is being used for large variety of applications that do not fit into the previous chapters. Smart homes are being enabled with improved communication systems and power management using IGBTs. The IGBT is used to control heating in printing and copying machines to fix the toner.

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• #### Bonfilia A. 06.05.2021 at 03:07

But, both these components had some limitations to be used in very high current applications.

• #### Jesper C. 14.05.2021 at 02:00

A comprehensive and state-of-the-art coverage of the design and fabrication of IGBT. All-in-one resource Explains the fundamentals of MOS and bipolar physics.

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