Protection unit for wide bandgap power switching device and method for operating the wide bandgap power switching device

The invention relates to a method for operating a power switching device, particularly a wide bandgap power switching device, in a power application, particularly in a converter, comprising the steps of:- checking (S2) a transient voltage of or related to a voltage drop across the switching device (22, 23) against a predetermined first threshold (Vref1,UP, Vref1,LOW) ;- reducing (S3) conductivity of the switching device (22, 23) if it is determined that the value of the transient voltage exceeds the predetermined first threshold (Vref1,UP, Vref1,LOW);- after reducing the conductivity, checking (S4) the voltage drop across the switching device (22, 23);- deactivating (S5) the operation of the switching device (22, 23) if it is determined that the voltage drop is larger than a predetermined second threshold (Vref2,UP, Vref2,LOW).

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Drazen Dujic, Chengmin Li
2023
Patent

Abstract

Official source

https://infoscience.epfl.ch/record/302904?ln=en

About this result

Related concepts (28)

Related publications (38)

Related MOOCs (6)

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A power semiconductor device is a semiconductor device used as a switch or rectifier in power electronics (for example in a switch-mode power supply). Such a device is also called a power device or, when used in an integrated circuit, a power IC. A power semiconductor device is usually used in "commutation mode" (i.e., it is either on or off), and therefore has a design optimized for such usage; it should usually not be used in linear operation. Linear power circuits are widespread as voltage regulators, audio amplifiers, and radio frequency amplifiers.

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.

Voltage spike

In electrical engineering, spikes are fast, short duration electrical transients in voltage (voltage spikes), current (current spikes), or transferred energy (energy spikes) in an electrical circuit. Fast, short duration electrical transients (overvoltages) in the electric potential of a circuit are typically caused by Lightning strikes Power outages Tripped circuit breakers Short circuits Power transitions in other large equipment on the same power line Malfunctions caused by the power company Electromagnetic pulses (EMP) with electromagnetic energy distributed typically up to the 100 kHz and 1 MHz frequency range.

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