Function Structure
1. SCR medium frequency induction heating power supply adopts AC-DC-AC variable frequency power supply structure. The rectifier of the power supply adopts 3-phase thyristor rectifying. 12-pulse thyristor rectifier can be adopted for large power equipment to enhance power grade and decrease grid side harmonic current. The inverter adopts high voltage large power high speed thyristor module to form inverter power unit, to realize large power output through the superposition of inverter power unit. The resonant tank circuit adopts parallel resonance, and parallel, multivoltage or transformer mode can be selected for different load heating.
2. The whole unit of equipment is composed of SCR medium frequency power supply, resonant tank circuit, circulation soft water cooling system, console (optional), automatic control system (optional).

Technical Features
       Perfect structure design
       1. Integration design of switchgear rectifying cabinet and inverter output cabinet, with compact structure and small size.
       2.The grid side power coefficient≥0.92. 12-pulse thyristor rectifier can be adopted for large power equipment with high DC voltage and small grid side harmonic current.
      3.Power combination of the inverter bridge is accomplished by the way of power unit superposition, which is convenient for installation and repair.
      4.High standard electromagnetism compatibility design, electromagnetism radiation meets national standard. Closed cabinet design, meeting rigor environmental requirements on site.
      5.Resonant tank circuit mode is an independent design as per user’s actual requirement with convenient and flexible site layout.

      Full digital control system
       1. 3-phase rectifier adopts high cost performance MCU controlling to realize precise synchronism trigger with high control precision and small grid-side non characteristic harmonic.
       2.Resonant inverter adopts CPLD to form full-digital control system that is characterized by their automatic constant angle, high phase-lock precise and wide scope of phase-lock.
       3. The power supply has perfect protection function with reliable working and low failure rate.

      HMI and fault diagnosis system (optional)
      1.Adopt PLC and touch screen to form perfect HMI system.
      2.Realize integrated automatic control of power supply system.
      3. Fault display and diagnosis system.

Main Technical Parameter

model	AC input	Rectifying mode	Power coefficient	Rated DC voltage	Rated DC current	Frequency Scope	Working status
KGPS 500-2000kW /0.5-3kHz	3AC380V 50/60Hz	6	0.95	500V	1000A－ 4000A	500－ 3000Hz	continuous incontinuous
KGPS 2000-10000kW /0.1-2kHz	3AC380V* 50/60Hz	12	0.95	1000V	2000A－ 10000A	100~ 2000Hz	continuous incontinuous
KGPS 10000-20000kW /0.1-1kHz	3AC600V* 50/60Hz	12	0.95	1500V	6600A－ 13000A	100~ 1000 Hz	continuous incontinuous

Reference for Selection of Medium Frequency Induction Heating Equipment for Thyristor

power：


：(weight of heated metal per second) kg；
：(temperature rise)℃；
：(specific heat capacity of metal)，(steel) 0.165，(copper) 0.085，(Aluminum) 0.14；
：(heating efficiency)，(copper)0.3，(Aluminum)0.4，(steel, below the Curie point) 0.75、(steel, above the Curie point) 0.6.


frequency：

   
(when  , the equipment has the highest heating efficiency).


distribution capacity：

  ：(simultaneity factor) 0.8~0.9




Can be customized according to user’s grid; General design, can be designed as per user’s technics; For more information, please contact EECTECH