Power Assemblies > Standard Power Assembly

Standard Power Assemblies

Driven by the manufacturing of highly efficient power assemblies that deliver on performance and reliability for specific customer applications, Dynex offer a varied range of industry standard power assemblies.

Controlled Rectifiers

AC Switch - Force Air Cooled

AC Switch -Water Cooled

Up to 1800V - Antiparallel Thyristor Module for Soft Start

Our Offerings

In order to maximise the semiconductor performance in an assembly, the type of heatsink, transient conditions, overloads, ambient temperature, surface finish (e.g. black anodised) and the method of cooling (air, liquid or phase change) is considered.

Our engineers encompass a wealth of experience and design assemblies with a range of bipolar and IGBT power semiconductor devices to ensure standard power assemblies are optimised for customer applications.

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If you need to talk to us about any of our products or services, get in touch.

+44 (0)1522 502 901

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Rectifiers

Single phase controlled and uncontrolled rectifier assemblies
3-phase and dual 3-phase rectifier assemblies
3-phase (6 pulse) and dual 3-phase (12 pulse) controlled rectifier assemblies

Stack Assemblies

Stick stacks for high voltage/high current applications
MV soft starts Thyristor/GTO assemblies with anti-parallel diode combinations
Air cooled and water cooled stack assemblies

Inverters Converters

3-phase thyristor inverter power units
IGBT chopper H-Bridge inverter modules
IGBT full 3-phase inverters for motor control
Frequency converters

Assemblies

Air Cooled Bipolar Assemblies

VDRM: ≤15kV Irms: ≤1500A

Application:

Locomotive
Industry
Converter

Features:
Thyristor/diode available, extruded aluminium heat pipe heat sinks.

Assemblies

Water Cooled Bipolar Assemblies

VDRM: ≤20kV Irms: ≤3000A

Application:

Locomotive
Industry
Converter

Features:
Thyristor/diodes IGCT available, gate drive and protection.

Assemblies

Pulse Power Bipolar Assemblies

VDRM:≤40kV Irms:≤4000A@500μs

Application:

Pulse power supply
High power microwave

Features:
Pulsed power device based for single switch application, gate drive and protection.

Assemblies

Locomotive Rectifier

Vibration resistance

Application:

Traction converter for locomotive

Features:
Alloyed diodes based air-cooling structure, vibration resistance and high reliability.

Assemblies

Soft Start Module

Thyristor Base

Application:

Traction converter for locomotive

Features:
Alloyed diodes based air-cooling structure, compact and lightweight, stable and reliable performance.

Assemblies

IGCT Assemblies

VDRM:≤40kV Irms:≤4000A@500μs

Application:

Rolling mill drive
Off-shore wind power

Features:
IGCT/FRD based water cooling compact structure, up to 14 MVA.

What types of applications are the 3-phase rectifies used in ?

A high-power thyristor 3-phase bridge as supplied by Dynex Power Assemblies team can be used anywhere that requires conversion of large AC power to controllable DC (rectifier mode) or DC back to AC (inverter mode). The most common users are steel/aluminium industries, railways, HVDC stations, and heavy industrial motor drives.

Heavy Industry (DC Power Supply Needs)

Steel Plants – for electric arc furnaces (EAFs), ladle furnaces, and rolling mills (where high-power DC required).
Aluminium Smelters – use large DC rectifiers for electrolytic reduction processes.
Electrochemical Plants - copper refining, chlorine production - where large DC currents needed.

Motor Drives and Propulsion

Large DC motor drives – cranes, mining hoists, rolling mills, paper mills.
Railway traction systems – for locomotives and metro trains (thyristor bridges provide controlled DC to traction motors).
Ship propulsion – marine vessels with large DC drive systems.

Power Transmission & Distribution

HVDC converter stations – thyristor 3-phase bridges are the core of line-commutated converters (LCC-HVDC).
Static VAR Compensators (SVCs) – sometimes include controlled rectifier bridges in combination with reactors and capacitors.

Large-Scale Power Supplies

Plasma heating and furnaces – controlled DC for arc furnaces or plasma torches.
Testing facilities – high-current DC test supplies for cables, transformers, and motors.

Infrastructure & Utilities

Railway substations – AC from the grid is rectified to DC for traction systems.
Research labs – particle accelerators, fusion experiments, and magnet power supplies often use large thyristor rectifiers.

Types of applications where AC Switch assemblies are used?

A high-power AC switch is used anywhere that needs fast, reliable, and repeated switching of very large AC currents. These are commonly used in utilities (for grid stability), heavy industries, renewable operators, railways, and advanced research facilities.

Electric Utilities and Grid Operators

Flexible AC Transmission Systems (FACTS) devices (like SVCs and STATCOMs) use thyristor switches to connect/disconnect capacitors or reactors.
HVAC transmission systems – to rapidly switch compensation banks for voltage control.
Solid-state circuit breakers – for ultra-fast fault interruption.

Heavy Industry

Steel plants – for electric arc furnaces, induction furnaces, ladle heating (fast AC power control).
Cement, paper and chemical industries – where large inductive motors or furnaces need controlled switching.
Mining operations – to switch large compressors, crushers and pumps.

Renewable Energy and Storage

Wind farms and solar plants – to switch capacitor banks, filters or dynamic reactive power devices.
Battery energy storage systems (BESS) – for high-power grid integration and rapid switching.

Transportation & Infrastructure

Railway traction substations – to switch large AC loads or feed sections of the rail grid.
Ship propulsion systems – high-power AC motor control and load switching.
Airports/metros – for stable high-power distribution.

Specialised Applications

High-power test laboratories – to switch massive loads during equipment testing.
Pulse power and research facilities – particle accelerators, fusion experiments - where AC switching must be extremely fast.
HVAC motor soft-starters –thyristor-based AC switches are used for smooth motor startup.