18 May Hence, the development of Gate Turn off Thyristor (GTO) addresses the major problem of the thyristor by ensuring the turn OFF mechanism. Production of GTOs commenced in the mid s. A GTO is a thyristor that can be turned off by applying a current to the gate in the reverse direction to that. The conventional thyristor can only be turned off by effectively reducing the anode current to zero, but the gate turn off thyristor.

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It was invented at General Electric. Navigate Search Login layouts-flyoutmenu-cart. I need more information ABB Sales. Please select country from the list below. Substantial snubber circuits are added around the device to limit the rise of voltage at turn off. These gate turn-off thyristors are useful in a number of areas, particularly within variable speed motor drives, high power, inverters and similar areas.


The key capability of the gate turn-off thyristor is its ability to be turned off by the use of the gate electrode on the device. Power management RF technology Test Wireless.

Gate Turn Off Thyristors Dynex Semiconductor is committed to the continued manufacture of GTOs to service the maintenance market that exists because of the long service life of traction equipment.

Gate turn-off thyristors (GTO)

Rate this page General impression. GTOs are increasingly being replaced by integrated gate-commutated thyristorswhich are an evolutionary development of the GTO, and insulated gate bipolar transistorswhich are members of the transistor family. Thyristors are switched ON by a gate signalbut bto after the gate signal is de-asserted removedthe thyristor remains in the ON-state until a turn-off condition occurs which can be the application of a reverse voltage to the terminals, or a decrease of the forward current below a certain threshold value known as the “holding current”.

Show on map Hide map. GTO thyristors can be fabricated with a reverse conducting diode in the yhyristor package. The turn on phenomenon in GTO is however, not as reliable as that of a standard thyristor and small positive gate current must be maintained even after turn on to improve reliability.


Please see our Privacy Policy for more information on how we protect and manage your submitted data. In other projects Wikimedia Commons. Send me more information. The GTO can be turned on by a gate signal, and can also be turned off by a gate signal of negative polarity. This is determined by the doping level and thickness of the n type base region. Reset of the saturable reactor usually places a minimum off time requirement on GTO based circuits.

High current devices, i.

Like the standard thyristor, the thgristor turn-off thyristor is a four layer device having three junctions. For this country please use ABB’s partner contact details.

Gate Turn-Off Thyristor, GTO

This thyrsitor stops the injection into the base region of TR1 and this prevents current flow in this transistor. The device turn off is achieved by applying a negative bias to the gate with respect to the cathode.

For other uses of the word, see GTO disambiguation. Another key parameter for a gate turn-off thyristor is the maximum forward blocking voltage. Production of GTOs commenced in the mid s. Please select a language below. A GTO is a gho that can be turned off by applying a current to the gate in the reverse direction to that required to turn it on.

Gate turn-off thyristors (GTO) | ABB

Accordingly the gate turn off thyristor is a useful tool for many applications. Usually, the reverse blocking voltage rating and forward blocking voltage rating are the same. Some of the forward current about one-third to one-fifth is “stolen” and used to induce a cathode-gate voltage which in turn causes the forward current to fall and the GTO will switch off transitioning to the ‘blocking’ state.

The resulting voltage drop in the base starts to reverse bias the junction and yhyristor stopping the current flow in this transistor – TR2. This is to provide good emitter efficiency for which the doping level should be low, while providing a good turn off characteristic for which a high doping level is needed. A gate turn-off thyristor GTO is a special type of thyristorwhich is a high-power semiconductor device.

Login to myABB There was a problem with your request. Events Customer events Investor events Media events. In this non-conducting thuristor the gate turn-off thyristor is said to be in its forward blocking mode.


The gate turn off thyristor is behaves somewhat differently to a standard thyristor which can thyristot be turned on and cannot be turned off via the gate. An error occurred and your inquiry could not be sent. For turn-off, the GTO requires a device that limits the rate of voltage rise, in essence a capacitor.

It can be thought of as being one PNP and one NPN transistor being connected in a regenerative configuration whereby once turned on the system maintains itself in this state. When a potential is applied across the gate turn-off thyristor between the anode and cathode, thhristor current gtp flow because neither device is turned on.

Please try again later or go to https: The turn on phenomenon in GTO is however, not as reliable as an SCR thyristor and small positive gate current must be maintained even after turn on to improve reliability. Normal thyristors silicon-controlled rectifiers are not fully controllable switches a “fully controllable switch” can be turned on and off at will.

Gate turn-off thyristor – Wikipedia

The gate turn off thyristor, GTO can be turned-on by a gate signal, and it can also be turned-off by a gate signal of negative polarity. If the voltage rises too fast at turn off, not all of the device will turn off and the GTO will fail, often explosively, due to the high voltage and current focused on a small portion of the device. The first thyristors were developed in the mids and established their place in the market as a high current high voltage switch.

The gate turn-off thyristor, GTO was not developed until later and only entered the market around GTO thyristors are available with or without reverse blocking capability.

GTOs are, by nature, relatively slow switches. Are you looking for support or purchase information? Select the products you are interested in by ticking the related checkbox.