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Parallel IGBT Medium/Superaudio Frequency Induction Hating Equipment

Author:Sifang Sanyi    Date:2013-11-25 18:40

product picture

 

Application Scope

 Metal heat penetration, hot forging, heat preservation, composite brazing, metal workpiece shrinkage fitting, metal quenching, annealing, normalizing and tempering.

 

Function Structure

The parallel IGBT medium/superaudio induction heating power supply adopts AC-DC-AC variable frequency power supply structure. The rectifier of the power supply adopts 3-phase thyristor rectifying or diode and IGBT chopper mode. 12-pulse rectifier can be adopted for large power equipment to decrease grid side harmonic current. The inverter adopts high voltage large power IGBT module and large power fast recovery diode 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.


The whole unit of equipment is composed of parallel induction heating power supply, resonant tank circuit, circulation soft water cooling system, console (optional), automatic control system (optional).

 

Technical Features

 

       Ø Perfect structure design

1. Integration design of switchgear rectifying cabinet and inverter output cabinet, with compact structure and small size.

2. DC chopper mode is selected to ensure the grid side power coefficient≥0.92 and a relative lower harmonic content.

3. Power combination of the inverter bridge is accomplished by the way of power unit superposition, which is convenient for installation and repair. Each IGBT power unit is designed to be 100kW or 200kW.

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 users actual requirement with convenient and flexible site layout.


Ø  Full digital control system

1.3-phase rectifier (DC chopper) 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.

 

Ø 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

Rated power coefficient

Rated DC voltage

Rated DC current

Frequency

Scope

Working status

GZP50-2000kW

/0.5-10kHz-B

3AC380V

50/60Hz

0.92

500V

100A

4000A

500Hz

10 kHz

continuous

incontinuous

GZP50-2000kW

/10-20kHz-B

3AC380V

50/60Hz

0.92

500V

100A

4000A

10~

20 kHz

continuous

incontinuous

GCYP50-1000kW

/20-50kHz-B

3AC380V

50/60Hz

0.92

450V

100A

2000A

20~

50 kHz

continuous

incontinuous

* Can be customized according to user’s grid.

 

Equipment  Selection

1.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


2.frequency

 

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


3.distribution capacity
 
(simultaneity factor) 0.8~0.9