Global and U.S. Direct-Light-Triggered Thyristors Market Report, Published by QY Research.

A high-voltage DC transmission (HVDC) operator in Germany encountered reliability issues and signal latency in converter stations using electrically triggered thyristors. The traditional gate-drive circuits required complex insulation systems and additional control wiring, which increased electromagnetic interference (EMI) and maintenance costs. To overcome these limitations, the company adopted Direct-Light-Triggered Thyristors (LTTs) - power semiconductor devices that use optical fibers to trigger the thyristor directly via laser light, eliminating the need for electrical gate connections. The optical triggering improved noise immunity, simplified converter design, and allowed precise synchronization of multiple devices under extreme voltages (up to 8 kV per device). After implementation, the HVDC system achieved higher switching reliability, reduced control complexity by 25%, and improved overall energy transmission efficiency. LTTs are now widely used in grid interconnectors, traction systems, and pulsed power equipment where ultra-reliable, low-latency switching is critical.

https://www.qyresearch.com/reports/5431588/direct-light-triggered-thyristors

Core Market Data

Global market size: USD 870 million
CAGR (2024-2030): 5.6%
Average price: USD 410 per unit
Annual production: 2.1 million units
Gross margin: 37%
Production capacity: 2.6 million units

List of Main Players

Littelfuse (USA)
Infineon Technologies (Germany)
STMicroelectronics (Switzerland)
Vishay Intertechnology (USA)
Mitsubishi Electric (Japan)
Hitachi Energy (Switzerland)
Semikron Danfoss (Germany)
Zhejiang Liujing Rectifier (China)
Dynex Semiconductor (UK)
Darrah Electric (USA)

1. By Voltage Rating

Medium-voltage LTTs (1-3 kV)
High-voltage LTTs (3-8 kV)
Ultra-high-voltage LTTs (8-12 kV)

2. By Triggering Method

Fiber-Optic Laser Triggered
LED-Triggered
Integrated Opto-Sensor Modules

3. By Cooling Method

Air-Cooled Modules
Liquid-Cooled Assemblies

4. By Symmetric Type

Asymmetric LTTs
Symmetric LTTs

5. By End-Use Sector

Power & Energy
Railway Systems
Aerospace & Defense
Industrial

Case Study for Bidding

Time: May 2024
Supplier: Infineon Technologies AG (Germany)
Buyer: Siemens Energy (Germany)
Product: 6.5 kV direct-light-triggered thyristor modules for HVDC converter stations
Quantity: 42,000 units
Contract Value: USD 21 million
Delivery Timeline: November 2025

Case Study for End Using

End User: ABB Power Grids (Switzerland)

Application: Integrated into HVDC converter valves for long-distance power transmission systems.

Installation Location

Mounted in series-stacked converter modules inside valve halls.
Coupled with fiber-optic laser triggering systems for precise synchronization.
Encapsulated in press-pack housings for uniform current distribution and heat dissipation.

Purpose

Enables optical isolation and noise-free triggering in high-voltage environments.
Reduces switching latency and eliminates gate-drive electronics.
Improves long-term operational reliability in HVDC converter operation.

Effect

Increased system efficiency by 15% due to reduced control losses.
Enhanced insulation coordination and EMI immunity by 25%.
Simplified converter valve architecture with fewer control circuits.

Alternative Devices

Electrically triggered thyristors and GTOs can handle high current but require complex drive isolation and higher maintenance.
Therefore, Direct-Light-Triggered Thyristors remain essential for next-generation HVDC, pulsed power, and high-energy conversion systems demanding compactness, high reliability, and optical control precision.

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