IGBT and its Usage in Motor Control

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The IGBT, Insulated Gate Bipolar Transistor, is a switching transistor that is driven by voltage applied to the gate terminal. Device structure and operation are identical to those of an Insulated Gate Field Effect Transistor, generally known as a MOSFET. The primary dissimilarity between the two device types is that the IGBT uses conductivity modulation to reduce on-state conduction losses which MOSFET does not do.

IGBT is a device that integrates the voltage feature of a bipolar transistor (collector – emitter) and the drive feature of a MOSFET. The key reason behind the flourishing popularity of IGBT is its superiority at high speed switching applications. This device is well-known for integrating high efficiency and fast switching. It is mainly used as an electronic switch in many modern appliances: variable-frequency drives (VFDs), electric cars, trains, variable speed refrigerators, air-conditioners and even stereo systems with switching amplifiers. Today we will discuss about usage of IGBT in motor control.

Advancements of highly capable motor drives are very essential for industrial applications. Satisfactory dynamic speed command tracking and load regulating response are two must needs, for a high performance motor drive system. DC motors excel in terms of speed control for acceleration and deceleration. The power supply of a DC motor joins right away to the field of the motor which approves for accurate voltage control, and is required for pace and torque control applications. Because of their simpleness, ease of application, dependability and auspicious cost, DC drives have long been a mainstay of industrial applications. Because of low horsepower ratings, DC drives are usually less costly in comparison with AC drive systems. DC motors are being used as adjustable speed machines traditionally and an extensive extent of options has developed for this intention.

To obtain sufficient levels of power handling capability, especially in motor control applications those demand multiple drive elements, power integrated circuits have been developed using hybrid constructions of the distinct transistors. Hybrid techniques have been necessary and useful due to the power handling limitations of monolithic power integrated circuit technology. Power integrated circuit design has often been limited by the absence of power packages that provide the low thermal impedance and high performance switching necessary for reliable operation. The switching elements of these modules, which may be Insulated Gate Bipolar Transistors (IGBTs) or various forms of thyristors, “chop” low-frequency (e.g., 60 Hz or dc) voltages /currents at the input / output port into high-frequency square wave pulses of variable width (20 to 200 ms).

The silicon GTO was the only available power semiconductor switching device until the 1990s. It had power conducting ability compatible for motor control applications. The ratings of IGBTs had adequately developed in the 1990s. It overcame one Megawatt which allowed entrance of the IGBT into the traction market. The availableness of the IGBT made allowance for notable advancements in the motor drive technology due to exclusion of snubber circuits and an raise in the operating frequency of the inverter circuit employed to transfer power to the motors.

History of IGBT and its Impact in our Life

The full form of IGBT is Insulated gate Bipolar Transistor. It is a three terminal power semiconductor device basically used as an electronic switch which can maintain high efficiency during fast switching. It has been utilized in many recent appliances:

Electric cars, trains, variable-frequency drives (VFDs), variable speed refrigerators, air-conditioners, stereo systems with switching amplifiers and even lamp ballasts and vacuum cleaners.

The IGBT is a hybrid device obtained by the integration of a BJT and a MOSFET in a
Darlington configuration. The IGBT allows a great reduction of conduction losses even for high voltage rating (low on-state resistance), low power gate drive losses (insulated grid) and it can switch today in of less than 100 ns, whereas only 3 μs about 20 years ago. In addition, the current density of IGBT is 20 times larger as compared to MOSFET and 5 times as compared to BJT. The IGBT is, basically, a horizontal channel and vertical current MOSFET cell (VDMOS), except for the N+ Drain layer, which is substituted by a P+
layer at the collector.

The IGBT is a semiconductor device with four variable tiers (P-N-P-N) that are handled by a metal-oxide-semiconductor (MOS) gate structure without resurgent operation. This way of action was first introduced by Yamagami in his Japanese patent S47-21739, which was filed in 1968. This method of action was initially reported as an experiment in the lateral four layer device (SCR) by B.W. Scharf and J.D. Plummer in 1978. This method of operation was also experimentally revealed in vertical device in 1979 by B. J. Baliga. Plummer filed a patent application for IGBT mode of operation in the four layer device (SCR) in 1978. USP No.4199774 was issued in 1980 and B1 Re33209 was reissued in 1995 for the IGBT mode operation in the four layer device (SCR).

An identical device was invented by Hans W. Becke and Carl F. Wheatley for which they filed a patent application in 1980, and which they referred to as “power MOSFET with an anode region”. This patent has been called “the seminal patent of the insulated gate bipolar transistor.”

Hands-on devices susceptible of operating over an extended current extent were first reported by Baliga et al. in 1982. An alike paper was also presented by J.P. Russel et al. to IEEE Electron Device Letter in 1982. The applications for the device were initially regarded by the power electronics community to be severely restricted by its slow switching speed and latch-up of the parasitic thyristor structure inherent within the device. However, it was demonstrated by Baliga and also by A.M. Goodman et al. in 1983 that the switching speed could be adjusted over a broad range by using electron irradiation. This was followed by demonstration of operation of the device at elevated temperatures by Baliga in 1985. Complete suppression of the parasitic thyristor action and the resultant non-latch-up IGBT operation for the entire device operation range was achieved by A. Nakagawa et al. in 1984. Today, IGBT modules are available with the capability of handling over 1000-amperes and sustaining more than 5000-volts.

The performance of IGBT advances gradually with the development of technology as it is a fairly modern invention. In power applications, bipolar transistor has already been replaced completely by IGBT; a power module is within reach in which several IGBT devices are attached in parallel, making it compatible for power levels up to few megawatts, which thrusts farther the limit at which thyristors and GTOs turn out to be the only option. According to its working principle, an IGBT is a bipolar transistor primarily, guided by a power MOSFET; it has the benefits of being a minority carrier device (satisfactory performance in the on-condition, even for high voltage apparatuses), with the high input impedance of a MOSFET (a very small volume of power can operate it on or off).

Nowadays, IGBTs are extensively used in industrial, medical, consumer, transportation, financial, aircraft and renewable power generation sectors of the economy. This lead to increased ease, favor and standard of life for billions of people all over the world. Over the last 20 years, the growing influence of the advanced efficiency of IGBT-powered applications have been a total worth saving of $ 2.7 Trillion for U.S. customers and $ 15.8 Trillion for global customers. Besides this, the promoted effectiveness generated by IGBT-powered applications has produced an aggregate diminution in carbon dioxide emissions by 35 Trillion pounds in the United States and 78 Trillion pounds globally by the last 20 years. We can’t deny the role of IGBT to make a viable worldwide society with uplifted living norms along with alleviating the environmental influence.

At this moment, a few manufacturers are the major product providers for the global market of IGBT. Infineon (Formerly Eupec), Fuji Electric, Mitsubishi, Powerex, Semikron, Toshiba etc companies are leading the IGBT world now.


http://www.uscomponent.com/history-igbt-impact-life/

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