Press-pack Power Thyristors

Press-pack (disc) thyristors are designed for high and very high power applications, featuring double-sided cooling for use in stack assemblies and a short-circuit-safe failure mode. Typical applications include large rectifier plants, electrolysers, metallurgical equipment, rolling-mill drives, converters, static transfer switches (STS), SVC/TCR/TSC and other FACTS systems, crowbar circuits, high-voltage power supplies, and high-power induction heating.

Different design solutions:

·         Case dimensions d = 47-112mm

·         Case height h = 14-36 mm

·         Custom dimensions

1. Phase control thyristors are used in DC and AC converters with an operating frequency of up to 1,000 Hz, in inverting and switching circuits of converter setups for electric locomotives and other types of electrically propelled vehicles, in power rectifiers for electroplating baths, for charging batteries, in high-voltage rectifier-inverter units of DC transmission line substations, and in aircraft de-icing equipment.

   Key parameters:

   • Voltage class: 200–6000 V

   • Average on-state current: 100–3200 A;

2. Fast thyristors are used in static power converters, and in various DC and AC power units with a frequency of up to 5,000 Hz, where short on/off switching intervals are required; in various types of electric welding equipment, in frequency converters for electrothermy, in traction systems of electric locomotives and electrified urban transport vehicles, in air ozonizers, in generators, and in modulators.

   Key parameters:

   • Voltage class: 600–2000 V

   • Average on-state current: 250–1250 A;

   • Turn-off time: 20-63 us

3. Fast distributed gate thyristors (high-speed pulse thyristors) are used in oscillators, modulators, inverters, and electric drive systems with thyristor-controlled pulse control with frequency of up to 10,000 Hz, where pulse operating currents, short on/off switching intervals, and high rates of current build-up are primarily required. The thyristors are characterized by high current-carrying capacity at high frequencies.

   Key parameters:

   • Voltage class: 300–4400 V

   • Average on-state current: 320–2500 A;

   • Turn off time: 8-160 us

4. Fast Strong Distributed Gate Thyristors (high-speed pulse thyristors) are designed for performance upon high frequency up to 20 kHz. Strong distributed amplified gate along with turn-off time less than 10 us designates high current drive capability upon high frequency.

   Key parameters:

   • Voltage class: 600–1300 V

   • Average on-state current: 400–1000 A;

   • Turn off time: 6,3-12,5 us

5.   Avalanche thyristors are used in static power converters and in other DC and AC circuits with a frequency of up to 1,000 Hz. Under certain conditions of reverse voltages, they can be used without any additional protection measures.

   Key parameters:

   • Voltage class: 600–1100 V

   • Average on-state current: 400–500 A;