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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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.

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GTO Thyristors – Power Semiconductors | Dynex Semiconductor | Dynex

When we do, we usually picture men in white shirts and dark glasses hunched over calculators and slide rules. This is determined by the doping level and thickness of the n type base region. Ghyristor turn-off thyristors GTO. As the gate-cathode behaves like PN junctionthere will be some relatively small voltage between the terminals.

Gate Turn-Off Thyristor, GTO ::

The minimum on and off time is handled in DC motor chopper circuits by using a variable switching frequency at the lowest and highest duty cycle. The typical on-off switching frequency is in the range of – hertz for most applications.

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. GTOs are, by nature, relatively slow switches. The gate turn off thyristor is behaves somewhat differently to a standard thyristor which can only be turned on and cannot be turned off via the gate.

Many aspects of the Gate turnoff thyristor, GTO are very similar to that of the ordinary thyristor. This then stops the injection into the base region of TR1 and this prevents current flow in this transistor. They typically have a reverse breakdown rating in the tens of volts.


Reset of the saturable reactor usually places a minimum off time requirement on GTO based circuits. I need service or support Thyrlstor Service. The first thyristors were developed in the mids and established their place in the market as a high current thyritor voltage switch. The resulting voltage drop in the base starts to reverse bias the junction and thereby stopping the current flow in this transistor – TR2.

It may be noted however, that the turn off time of a GTO is approximately ten times faster than that of a comparable SCR.

Gate turn-off thyristor

Features Double side cooling High reliability in service High voltage capability Fault protection without fuses High surge current capability Turn-off capability.

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These high current density areas become hot, and can cause device failure if the current is not extinguished quickly. Please try again later or go to thhristor Accordingly it is not as well known in many circles as the more familiar thyristor, although within its own area, it is widely known and used. An error occurred and your inquiry could not be sent. Go to myABB Logout. When a potential is applied across the gate turn-off thyristor between the anode and cathode, no current will flow because ggo device is turned on.

Thyristors are switched ON by a gate signalbut even after the gate signal is de-asserted removedthe thyristor remains thydistor 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”.

If the voltage rises too fast at turn off, not all of the device will turn off and the Thhristor will fail, often explosively, due to the high voltage and current focused on a small portion of the device. A distributed buffer gate turn-off thyristor DB-GTO is a thyristor with additional PN layers in the drift region to reshape the field profile and increase the voltage blocked in the off state.

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. Turn off is accomplished by a “negative voltage” pulse between the gate and cathode terminals.


This has the drawback that it renders the junction nearest to the cathode normally referred to as J3 with a low breakdown voltage – typically 40 volts. This pulls the collector of this transistor down towards the emitter voltage and in turn this turns on the other transistor – TR1. GTOs are increasingly being replaced by integrated gate-commutated thyrietorwhich are an evolutionary development of the GTO, and insulated gate bipolar transistorswhich are members of the transistor family.

When this is done, it turns on TR2 in the diagram. The fact that TR1 is now switched on ensures current flows into the thyristo of TR2, and thus this feedback process ensures that once the gate turn-off thyristor like any other thyristor is turned on it remains on. To turn the device on it is necessary to inject current into gate circuit of the device.

High current devices, i. In this non-conducting state the gate turn-off thyristor is said to be in its forward blocking mode. Navigate Search Login layouts-flyoutmenu-cart.

Gate turn-off thyristors (GTO)

By staying here you are agreeing to our use of cookies. GTO thyristors suffer from long switch off times, whereby after the forward current falls, there is a long tail time where residual current continues to flow until all remaining charge from the device is taken away. When the current filaments are extinguished, the overall current flow stops and the depletion layers around the junctions grow – the gate turn-off thyristor enters its forward blocking state again.

It was invented at General Electric.

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