SiC Inversion Welding Power Supply for High-Frequency Control
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Solution Overview
Problem
Existing argon arc welding power supplies face limitations in switching speed and control precision due to the use of IGBT or MOSFET high-frequency inverters, making it difficult to achieve high dynamic response and fine control of the welding process, especially with advanced materials in industries like marine engineering and aerospace.
Innovation Solution
A DSC-based all-digital SiC inversion type multi-function argon arc welding power supply with a main circuit and DSC control circuit, utilizing SiC power devices for high-frequency switching and a DSC minimum system for precise digital control, enabling closed-loop control and optimization of the welding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If IGBT or MOSFET high-frequency inverter is used, then the welding power supply can meet most metal material welding requirements, but the switching speed and switching losses limit the inverter frequency and dynamic response speed
Solution Approach 1:
The patent changes the material parameter of the power device from traditional IGBT or MOSFET to SiC (silicon carbide) devices. This material parameter change enables higher switching frequencies (up to 100kHz or higher) while reducing switching losses, directly resolving the contradiction between switching speed and energy loss.
2Measurement precision
If analog control or simple microprocessor-based digital control is used, then the control system is simpler, but fine control of the argon arc welding process based on welding arc design is difficult to achieve
Solution Approach 1:
The patent replaces traditional analog control or simple digital control with DSC (Digital Signal Controller) based all-digital control. This substitution enables precise digital control of the welding process with sampling frequencies up to 100kHz, achieving fine control based on welding arc design while managing system complexity through integrated digital control architecture.
Solution Approach 2:
The patent implements real-time feedback control using DSC to continuously monitor and adjust welding parameters. The digital control system samples welding current and voltage at high frequencies, compares actual values with target values, and dynamically adjusts control signals to maintain precise welding process control.
3Productivity
If traditional power devices are used, then the structure is more conventional, but the inverter frequency cannot be increased further to improve dynamic response speed
Solution Approach 1:
The patent changes the physical parameters of the power device to SiC materials, which have superior electrical characteristics including higher breakdown voltage, lower on-resistance, and faster switching speeds. This enables the inverter frequency to be increased to 100kHz or higher, significantly improving dynamic response speed for welding process control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves high control accuracy, fast response, reduced energy consumption, and improved welding quality by increasing switching frequency, reducing the size and weight of power transformers, and enhancing thermal resistance, leading to better reliability and adaptability in welding processes.
Implementation Method 1
utilizing SiC power devices for high-frequency switching
Implementation Method 2
an SiC inversion and commutation module
Implementation Method 3
a power transformer
Implementation Method 4
a SiC rectification and smoothing module
Data Source
AI summary
The invention provides a DSC-based full-digital SiC inversion type multi-function argon arc welding power supply, which includes a main circuit and a DSC control circuit; the main circuit includes a common mode noise suppression module, a power frequency rectification and filter module, a SiC inversion and commutation module, power transformer, a SiC rectification and smoothing module and a non-contact arc ignition module connected in sequence and are respectively connected to external arc load; the DSC control circuit includes a DSC minimum system, a human-machine interaction module, a fault diagnosis and protection module, a SiC high-frequency drive module connected to SiC inversion and commutation module, and an electrical load signal detection module connected to the arc load. The argon arc welding power supply has a simple structure, high control accuracy, fast response, small size, high efficiency, low energy consumption and excellent process adaptability, which can improve the quality of welding process.