Publication

Importance of Quasi-Saturation Effect in the Bipolar Junction of High Voltage NPT- IGBTs for power calculations

Alfred Rufer, Serge Pittet
2001
Conference Papers

Abstract

During the turn-on process insulated gate bipolar transistors (IGBTs) traverse a quasi-saturation region from the off-state to the on-state (saturation). The additional voltage drop due to the quasi-saturation of the junction hardly depends on the DC-link voltage.Even if this voltage drop is low comparing to the DC link voltage, the losses due to this effect are rather big as its time constant is large for high-voltage high-speed IGBTs. Standard ZCS or ZVS circuits can't help to avoid those losses. We will show that at relatively low switching frequency the on-state voltage drop may never reach the static value and the on-state losses are much bigger than expected.

Official source

https://infoscience.epfl.ch/entities/publication/547efc55-1471-42a4-8704-e2fe808f6722

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Alfred Rufer, Serge Pittet
2001
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/547efc55-1471-42a4-8704-e2fe808f6722

About this result

Related concepts (25)

Voltage regulator

A voltage regulator is a system designed to automatically maintain a constant voltage. A voltage regulator may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages. Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elements.

Bipolar junction transistor

A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier. A bipolar transistor allows a small current injected at one of its terminals to control a much larger current flowing between the terminals, making the device capable of amplification or switching. BJTs use two p–n junctions between two semiconductor types, n-type and p-type, which are regions in a single crystal of material.

Voltage multiplier

A voltage multiplier is an electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage, typically using a network of capacitors and diodes. Voltage multipliers can be used to generate a few volts for electronic appliances, to millions of volts for purposes such as high-energy physics experiments and lightning safety testing. The most common type of voltage multiplier is the half-wave series multiplier, also called the Villard cascade (but actually invented by Heinrich Greinacher).

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