An intermediate frequency inverter resistance spot welding power supply system

Abstract

The invention discloses an intermediate frequency inverter resistance spot welding power supply system, which includes a main circuit and a control system. The main circuit includes a power switch connected in sequence, an input rectification filter circuit, a power inverter circuit, an intermediate frequency transformer, and an output rectification filter circuit. The control system includes a control transformer and a control circuit; the control transformer and the input rectification and filtering circuit are respectively connected to the power frequency AC grid through a power switch, the output rectification and filtering circuit is connected to the load, and the control circuit is connected to the power inverter circuit, keyboard, The display devices are connected respectively, and the control circuit is also connected with the output terminal of the power inverter circuit. The invention is simple, easy to operate, high efficiency, high control precision, fast response speed, adopts three-stage heating, has output functions such as constant current, constant voltage, constant power, fixed pulse width, etc., 15 welding parameters are adjustable, and 20 groups of welding Parameter storage.

Description

technical field [0001] The invention relates to a spot welding power supply in the field of welding, in particular to an intermediate frequency inverter resistance spot welding power supply system. Background technique [0002] The resistance spot welding power supply mainly has the following types: single-phase power frequency power supply, three-phase low-frequency power supply, thyristor secondary rectification power supply, capacitor energy storage power supply, inverter power supply, etc. The first four power supplies are used in The spot welding process mainly has the following problems: [0003] (1) The energy output control and time control accuracy cannot meet the requirements. The current mainstream AC spot welding power supply has a response speed of 20ms, and the control response speed and adjustment resolution are insufficient; [0004] (2) Most power supplies use power frequency transformers, which are bulky, heavy, low in efficiency, and consumable; [0005...

AI Technical Summary

Problems solved by technology

[0003] (1) Energy output control and time control accuracy cannot meet the requirements

The current mainstream AC spot welding power supply has a response speed of 20ms, and the control response speed and adjustment resolution are insufficient;

[0004] (2) Most power supplies use power frequency transformers, which are bulky, heavy, low in efficiency, and consumable;

[0005] (3) Most of them are open-loop systems, some with current and voltage feedback control, and the power supply is not stable enough

[0010] (1) The lagging arm switching tube will lose the zero voltage switching function under light load;

[0011] (2) In order to realize the ZVS of the lagging arm, an inductor must be connected in series in the circuit, which will cause the loss of the duty cycle and increase the current rating of the primary side;

[0012] (3) There is a large circulation on the primary side, which increases the on-state loss of the system

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