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Digital flip flop of three phase full bridge controllable silicon welding power source main loop

A technology of digital triggering and welding power supply, which is applied in the direction of welding power supply, welding equipment, arc welding equipment, etc., to achieve the effect of ensuring consistency and stability

Inactive Publication Date: 2005-08-10
SHANGHAI JIAO TONG UNIV +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although this design is compared with the two design methods of discrete components and ASICs to realize the trigger control of the thyristor three-phase full-controlled bridge, it has advantages in the anti-interference of the trigger, flexibility and the symmetry of the three-phase trigger pulse. It has been greatly improved, but discrete analog devices are still used in the synchronous pulse forming circuit to realize the synchronization of the synchronous voltage signal and the power frequency signal, that is, there are still disadvantages of using analog control circuits

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  • Digital flip flop of three phase full bridge controllable silicon welding power source main loop
  • Digital flip flop of three phase full bridge controllable silicon welding power source main loop

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Embodiment Construction

[0015] Such as figure 1 As shown in and 2, the present invention includes: a main circuit, a trigger driving circuit, and a synchronous circuit.

[0016]The composition and connection mode of the main circuit are: the primary side of the main circuit transformer is connected in a star shape, the secondary side is composed of a three-phase fully-controlled bridge rectifier circuit and a synchronous transformer, and the fully-controlled bridge rectifier circuit is connected in a delta, and its thyristor S1 , the cathodes of S2 and S3 are connected together as the positive output of the power supply, the anodes of SCR S4, S5 and S6 are connected together and connected with the filter inductor L of the main circuit, and the resistor R10 is connected across the filter inductor Between the positive output terminal of the power supply, the other end of the filter inductor L is used as the other end of the power output, the anode of the thyristor S1 is connected to the cathode of S4, ...

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Abstract

A digital trigger for the main loop of three-phase full-bridge SCR power supply used for welding is composed of main circuit, trigger driver and synchronizer. Its main loop consists of synchronizer, synchronous transformer, resistors and voltage stabilizing diodes. The output voltage or current can be controlled in closed-loop mode. Its advantages are high real-time control accuracy, and high reliability, symmetricity and stability.

Description

technical field [0001] The invention relates to a main circuit of a welding power supply, in particular to a digital trigger circuit of the main circuit of a three-phase full-bridge thyristor welding power supply, belonging to the technical field of electric welding machines. Background technique [0002] The large current feed system composed of thyristor rectifier bridge is widely used in industrial production. It is a very common circuit to use thyristor as the power device in the main circuit in the welding power supply. The high-power rectifier bridge has high requirements for the thyristor trigger circuit: high control precision, good real-time performance, high symmetry, strong stability, and safe and reliable triggering. At present, the thyristor trigger circuit mainly adopts two design methods of discrete components and application-specific integrated circuits. The trigger circuit designed with discrete components has a large dispersion of multi-phase circuit perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/10B23K11/24
Inventor 宋政吴毅雄徐鸣华学明李芳刘伟
Owner SHANGHAI JIAO TONG UNIV
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