Multivoltage Welding Apparatus With Segmented DC-DC Converters
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Solution Overview
Problem
Conventional welding power supplies face challenges in providing stable and flexible power distribution to welding apparatuses due to variations in input voltages, leading to inefficiencies in cost, stability, and complexity.
Innovation Solution
The proposed solution involves an apparatus with an input circuit to generate a first DC voltage from AC input, a boost converter to output a fixed DC voltage for welding power, a control DC-DC converter for control signals, and an auxiliary AC power source to generate AC auxiliary voltage, enabling stable operation and flexible power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DC-DC converter is used to provide both welding power and control power, then device complexity is reduced, but power distribution flexibility and stability deteriorate
Solution Approach 1:
The power conversion system is segmented into two independent DC-DC converters: a first DC-DC converter dedicated to generating welding power from the rectified DC voltage, and a second DC-DC converter dedicated to generating control power for controlling the first converter. This segmentation allows each converter to be optimized for its specific function, improving overall system stability and flexibility while maintaining manageable complexity through modular architecture.
2Reliability
If AC voltage from mains is used to supply control circuitry, then independence from DC bus is achieved, but system complexity and cost increase
Solution Approach 1:
The control power supply is merged with the DC bus system by using the rectified DC voltage as the input to the second DC-DC converter. This integration eliminates the need for separate AC-to-DC conversion circuitry for control purposes, reducing system complexity and cost while maintaining reliability through the dedicated converter architecture.
3Device complexity
If boost converter generates constant DC voltage for both welding and auxiliary components, then system simplicity is improved, but power stability for auxiliary components deteriorates
Solution Approach 1:
The power distribution is segmented into two independent pathways: one through the first DC-DC converter for welding power delivery, and another through the second DC-DC converter for auxiliary component power supply. This segmentation ensures that fluctuations in welding power demands do not affect the stability of auxiliary power, as each converter independently regulates its output based on its specific load requirements.
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
This configuration ensures stable and flexible power supply to welding apparatuses, reducing complexity and costs by providing a fixed DC voltage for welding and auxiliary AC power, enhancing operational stability and efficiency.
Implementation Method 1
an AC power input may be rectified to generate a rectified input voltage
Implementation Method 2
a boost converter that generates power at a constant DC voltage for welding, may also be configured to distribute the constant DC voltage
Data Source
AI summary
An apparatus may include an input circuit to receive an AC input voltage having a first magnitude within a range of AC input voltages, and generate a first DC voltage; a boost converter to receive the first DC voltage and output a second DC voltage having a fixed magnitude that is not dependent upon the first magnitude of the AC input voltage; an output circuit to receive the second DC voltage and convert the second DC voltage into welding type power; a control DC-DC converter to receive the first DC voltage and output a control power signal as a third DC voltage; a boost converter control component to receive the control power signal and generate a control signal to control operation of the boost converter; and an auxiliary AC power source to receive the second DC voltage output by the boost converter and to generate an AC auxiliary output voltage.