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The electric welder is an indispensable equipment in the field of industrial cattle production and processing. Among them, the inverter welder has excellent performance due to its small size, light weight, good control performance, fast dynamic response and easy real-time control of the welding process. The mainstream development direction of products.
Most of the inverter welding products in the target market work in the hard-switching state, the switching loss is serious, and the switching frequency is limited to a few kHz to several tens of kHz, which can not fully exert the characteristics of miniaturization and portability of the inverter welding machine. In addition, the power consumption of welding equipment accounts for 5‰ of China's total annual power generation, and is listed as one of the top ten high-energy products. Therefore, the introduction of soft switching technology into the field of inverter welding is of vital importance for reducing switching losses, increasing switching frequency, reducing bulk and energy, and saving energy. Due to the characteristics of its own structure, the full-bridge converter can easily work in a variety of soft-switching modes, and has the advantages of small voltage rating of the power device, high utilization of the transformer, small filter inductance, and can work in both voltage and current. Mode. The current mode is particularly suitable for use in the control of high frequency inverter welders.
Therefore, this paper designs a full-bridge phase-shift resonant inverter arc welding power supply based on peak current control mode.
Structural composition and function
The block diagram of the full-bridge phase-shifting resonant inverter arc welding power supply system based on the peak current mode is shown in Figure 1. 
The 220V AC mains is rectified and filtered as the DC input of the full-bridge inverter. The output is a high-frequency AC voltage square wave with adjustable pulse width. After being isolated and stepped down by the high-frequency transformer, it is satisfied by the output rectification and filtering. DC power required for soldering.