Modular Welding Power Supply with Segmented Boost Circuits
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Solution Overview
Problem
Welding-type power supplies face challenges with portability and adaptability to different input voltages and frequencies, leading to inconsistent outputs, harmonic distortion, and increased power dissipation due to discontinuous conduction in three-phase rectifiers, which compromises efficiency and thermal design.
Innovation Solution
A modular welding-type system with three single-phase boost power circuits and an input power distribution module that connects each module to a unique single-phase power signal, allowing for both single and three-phase operation, with a controller managing the distribution and ensuring balanced output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a three-phase rectifier is used in welding-type power supplies, then the system can accept three-phase input power, but discontinuous conduction occurs causing harmonic distortion and reduced power factor
Solution Approach 1:
The three-phase power supply is divided into three separate single-phase power circuits, each processing one phase independently. This segmentation eliminates the discontinuous conduction problem in three-phase rectifiers by ensuring continuous current flow in each single-phase circuit, thereby reducing harmonic distortion and improving power factor while maintaining three-phase input capability
2Power
If a three-phase rectifier is used, then the system can handle high power input, but line current requirements increase leading to higher power dissipation
Solution Approach 1:
By dividing the high-power three-phase input into three separate single-phase circuits, each circuit handles one-third of the total power with continuous conduction. This reduces peak current demands and associated I²R losses in each circuit, lowering overall power dissipation while maintaining high power handling capability
Solution Approach 2:
The single-phase power circuits are designed to operate with continuous conduction mode, ensuring that current flows continuously through the power switches and inductors. This continuity eliminates the discontinuous conduction losses present in traditional three-phase rectifiers, reducing power dissipation while maintaining high power transfer efficiency
3Adaptability or versatility
If welding-type power supplies are designed for portability and different input voltages, then the system can be moved and used with various inputs, but output consistency becomes difficult to maintain
Solution Approach 1:
The power supply system is designed with three universal single-phase power circuits that can each accept different input voltages and frequencies (115V, 230V, 460V, 575V at 50Hz or 60Hz). The controller selectively activates the appropriate circuits based on detected input conditions, ensuring consistent welding-type output regardless of input variations, thus achieving both portability and output consistency
4Object-generated harmful factors
If single-phase power circuits are used instead of three-phase, then harmonic distortion is reduced, but power handling capability decreases
Solution Approach 1:
Three separate single-phase power circuits are merged in parallel to achieve high power handling capability. Each single-phase circuit operates independently with continuous conduction to minimize harmonics, and their combined output delivers the required high power, thus achieving both low harmonic distortion and high power capability
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 system maintains high power factor and efficiency by reducing line current requirements, minimizing harmonic distortion, and optimizing thermal design through balanced power distribution and modular design, enabling consistent output across varying input conditions.
Implementation Method 1
a first single-phase boost power circuit (501) and a second single-phase boost power circuit (505) that receive the single phase input and provide an intermediate bus (520) having an intermediate voltage that is higher than a voltage of the single phase input
Implementation Method 2
a first isolated dc-dc converter (503) and a second isolated dc-dc converter (507) that receive the intermediate bus (520) and provide an output bus (540) having an output voltage that is different from the intermediate voltage
Data Source
AI summary
A method and apparatus for providing welding-type power includes receiving an input that may be either a single or a three phase input voltage. Three power modules, each having a single phase boost power circuit, and an output circuit process the input power. A weld output circuit receives and combines the outputs of the three power modules. An input power distribution module connects the three power modules such that each receives a unique single phase power signal. A controller controls the three power modules and the input power distribution module.