Thyristor Power Switches
Thyristor Power Switches
Transient and harmonics-free, noiseless power control.Thyristor Power Switches also known as SCR Power Switches are based on the concept of zero crossover switching. They are designed to control power delivery by turning the AC power ON and OFF proportional to the control signal. These switches incorporate a Silicon Rectifier (SCR) or Thyristor as the primary controlling device. The zero crossover triggering circuit provides gate cathode firing pulses to control the delivery of power. They feature an adjustable cycle time which determines the ON and OFF periods of the Thyristor device with respect to the control signal level.
Why use Thyristor Power Switches?
Thyristor Power Switches are an excellent replacement for legacy electromechanical contactors. They don’t cause any arcing/sparking or generate harmonic distortion. Unlike conventional contactors, Thyristor Power Switches can accept logic pulses or analog signals which are then converted into equivalent PWM logic pulses.
Libratherm offers Thyristor Power Switches ranging from 10A to 1000A load. They can be paired with Libratherm's PID Controllers and Ramp Soak Controllers for precise temperature control for various applications.
Some of the applications where Libratherm Power Switches are successfully implemented:
- Aluminium Melting Furnaces
- Holding Furnaces
- Air Handling Units
- Dehumidifiers
- Boilers
- Hot Air Generators and Hot Air Dryers
- Very high temperature furnaces built using Silicon Carbide/MoSi2 heating elements
- Microwave dryers
- Multi-zone Drying and Curing Ovens
- Heat Transfer Printing Machines
- Food Grains, Paper and Printing drying ovens made using Quartz tube Medium wave IR and Ceramic coated IR heaters
- Pet bottles Pre Forms preheating tunnel ovens made using IR heaters
- Plastic Injection moulding requiring multi-zone heating for manifold moulds
- Plastic Pipes and Sheets extrusion
- Metal sheets welding systems
