Digital control system of arc welding inverter power supply based on DSP-EEWORLD

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Arc welding inverter power supply (also called arc welding inverter) is a new type of arc welding power supply that is efficient, energy-saving and lightweight. At present, ICBT is used as a power control device to improve the controllability and stability of the power main circuit, and 8-bit and 16-bit single-chip microcomputers are used as the control core to control the welding program and calculate the welding parameters, which improves the operability of the arc welding inverter power supply. The widespread popularization and application of digital signal processors (DSPs) provide the necessary hardware and software foundation for the full digitalization of arc welding inverter power supply control systems.

Comparative Analysis of DSP and Single Chip Microcomputer Performance

Microcontrollers (MCUs) are widely used in household appliances, industrial control, and smart terminals, mainly for control. DSPs can implement most algorithms that were previously implemented by software at high speed. Table 1 compares the performance indicators of typical microcontrollers and DSPs.

As can be seen from Table 1, compared with the single-chip microcomputer, the advantages of DSP are: strong data processing capability, high computing speed, ability to complete complex calculations in real time, single-cycle multi-function instructions, high PWM resolution, and shorter sampling cycle.

According to the current technical status, it is a good method to combine DSP and MCU to design the system, which can give full play to the strong control ability of MCU and the advantages of DSP's powerful data processing ability and high running speed. It can improve the accuracy and real-time performance of arc welding inverter power supply control system and meet the higher performance requirements of arc welding inverter power supply.

At present, the DSPs suitable for arc welding inverter power control mainly include TI's TMS320C2000 series, ADI's ADSP2100 series, and Motorola's DSP56F800 series. The following uses TI's 16-bit fixed-point TMS320LF2407A as an example to illustrate the structure of DSP.

Improved Harvard structure; pipeline operation; hardware multiplier; fast instruction cycle; TMS320LF2407A clock frequency reaches 40MHz, that is, the instruction cycle is 25ns, and the computing power is 40MIPS (million instructions per second). The chip has a set of instruction systems designed specifically for digital signal processing. The instructions simplify the digital signal processing process, optimize the event management module and peripheral circuits: As shown in Figure 1, the DSP chip integrates A/D conversion, large-capacity memory, timer, comparison unit, capture unit, PWM waveform generator, digital I/O port, SPI, SCI, CAN, among which the combination of 4 general timers and 12 comparison units can generate up to 16 PWM outputs, which is enough to drive the IGBT main circuit.

In addition, TMS320LF2407A has unique features such as fast interrupt processing capability, reverse addressing function of data pointer, hardware addressing control and multiple power saving modes. These features will be conducive to the application of TMS320LF2407A in arc welding inverter power supply control.

Keywords：DSP Reference address：Digital control system of arc welding inverter power supply based on DSP

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