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Central Operation Console for High Frequency Welding Machine
1.1 The solid state H.F. welder adopts Germany IXYS company IXFN38N100Q2 38A/1000V high-power MOSFET and DSEI 2×61-12B 60A/1200V rapid recovery diode to compose series type invertible circuit.
1.2 The solid state H.F. welder adopts modularization design with more compact structure which makes maintenance and high-power realization much easier.
1.3 It has particular technology of bridge-divided over-current protection that guarantees equipment safety.
1.4 It combines international advanced control method of same products, adopts advanced technologies like fixed angle phase-locking control, upper frequency limit/lower frequency limit lock-lost protection and etc. With these technologies, the equipments run more stably, more efficiently, more accurate and effective protections to the inductor short-circuit and open-circuit malfunction during pipe welding production.
1.5 Line-in end of solid state H.F. welder does not need step-up /step-down rectifier transformer, compared with vacuum tube welder and parallel type welder; it has significant energy-saving effects (Under same welding condition, energy-saving ≥30% compared with vacuum tube welder).
2. Model instructions for solid state H.F. welder
3. Working principle of solid state H.F. welder
3.1 Main circuit structure of solid state H.F. welder
Solid state H.F. welder main circuit structure is as follows fig.1; it is a typical AC-DC-AC variable frequency structure. Rectifier adopts 3-phase bridge style thyristor phase-control rectifier circuit, DC side adopts inductor, capacitor to compose LC filter which meet the working requirements of voltage type inverter. The voltage type inverter adopts modularization parallel structure to extend power supply power, each inverter module is single phase MOSFET bridge style circuit connected with series resonance tank circuit by H.F. matching transformer. On one hand, the matching transformer realizes power combination and impedance matching; on the other hand it realizes electric isolation of load and power supply. To put effective and swift protection on over-current malfunction of voltage type inverter, our company introduces special and stable over-current protection circuit which guarantees safe and stable running of inverter.
4. Brief introduction for solid state H.F. welder
4.1 Switchgear rectifying cabinet
Designed with integration of switchgear cabinet and rectifying part, except achieving switchgear cabinet functions, it also has rectifying control functions of solid state H.F. welders.
l Installed line-in switch, line-in current meter, voltage meter (can be switched) and line-in voltage indication lamp;
l Installed 3-phase full-controlled thyristor rectification bridge to realize power adjustment of the HF welder;
l Installed flat-wave reactor, flat-wave capacitor and filter to improve the flat-wave coefficient.
4.2 Inverter output cabinet
l The inverter part is consisted of MOSFET single-phase inverter bridge connected in parallel. The power of single-phase bridge is 120kW; the inverter bridge adopts the building block method to realize power superposition. Every piece of bridge plates is designed in the shape of a drawer, which is very easy to install and repair;
l The matching transformer is adopted for power combination, also it adopts the output method by of secondary resonance and non-welding transformer, tank circuit resonance capacitor (low voltage) resonates with the inductor directly, and the output pole plate offers required power transmission for pipe welding;
l Adopted sealed equipment case, installed with air conditioner.
4.3 Connecting optical fiber
Switchgear rectifying cabinet and inverter output cabinet are connected with optical fiber to make sure control system can not be disturbed by high frequency signal, which enhances the reliability of equipment.
4.4 Circulation soft water cooling system
Water-water cooling system adopts plate type heat exchanger for the cooling of switchgear rectifying cabinet, inverter output cabinet, resonance tank circuit etc with designing of indication and protection of temperature and water level.
4.5 Central operation console
It realizes the functions of remote operation, power adjustment, status monitoring and malfunction diagnosis for solid state H.F. welder.
l Mounted with HMI composed of PLC and LCD touch screen, which is easy to be operated and monitored by user at site.
l Installed with various AC and DC meters and operation buttons for the working status display for the welder.
4.6 Mechanical adjustment device
For inverter output cabinet installation and inductor position adjustment.
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Audited Supplier 
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