Parallel Buck-Boost DC/DC Converter for Stable Electrofusion Welding
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Solution Overview
Problem
Conventional power supplies, including AC generators, are not suitable for providing precise and consistent output voltage required for electrofusion welding, especially when using batteries as a power source, which deplete quickly and struggle to maintain necessary voltage levels for high-current applications.
Innovation Solution
A DC to DC power convertor system configured in a buck-boost configuration, connected in parallel, with control logic to manage switches and operate in either buck or boost mode, ensuring a constant output voltage even as the battery voltage depletes, and capable of charging the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a battery is used as a power source for electrofusion welding, then portability is improved, but the battery depletes quickly and cannot maintain necessary voltage levels for high-current applications
Solution Approach 1:
The patent employs a DC-DC converter with dynamic switching between buck and boost modes to adapt to changing battery voltage conditions. As the battery depletes and voltage drops, the converter dynamically adjusts its operation to maintain stable output voltage, thereby extending the effective operational duration of the battery power source while preserving portability.
Solution Approach 2:
The system changes operational parameters by switching between different converter modes (buck/boost) based on battery state. This parameter adaptation allows the system to maintain optimal performance across varying battery charge levels, effectively extending usable battery life while keeping the portable power source configuration.
2Ease of operation
If a battery is used as a power source, then portability is improved, but voltage control precision deteriorates as battery voltage drops
Solution Approach 1:
The DC-DC converter incorporates feedback control mechanisms that continuously monitor battery voltage and adjust switching parameters accordingly. This feedback ensures precise output voltage control even as the battery voltage fluctuates during discharge, maintaining welding quality while preserving the portability benefits of battery power.
Solution Approach 2:
The converter dynamically adjusts its duty cycle and switching frequency based on real-time battery voltage conditions. This dynamic parameter adjustment compensates for battery voltage drop, maintaining precise voltage control throughout the battery's discharge cycle while keeping the system portable.
3Power
If conventional AC generators are used, then power output is sufficient for high-current applications, but the equipment becomes large and heavy
Solution Approach 1:
The patent replaces the mechanical AC generator system with an electrical DC-DC conversion system. This substitution eliminates the need for heavy combustion engines and mechanical power generation components, achieving sufficient power output for electrofusion welding while dramatically reducing equipment weight and improving portability.
Solution Approach 2:
The system changes the fundamental power source parameter from AC generation to DC conversion. By using a battery-powered DC-DC converter architecture, the system delivers the necessary high-current power output without the weight penalty of conventional AC generators, enabling portable electrofusion welding applications.
4Measurement precision
If specialist power units with AC generators are used, then voltage control precision is improved, but device complexity and weight increase
Solution Approach 1:
The patent replaces complex AC generation and rectification systems with a streamlined DC-DC converter architecture. This substitution maintains precise voltage control capability while eliminating unnecessary mechanical components, filters, and conversion stages, thereby reducing overall system complexity without sacrificing voltage precision.
Solution Approach 2:
The DC-DC converter is designed to perform multiple functions: voltage regulation, current control, and adaptation to varying battery conditions. This multi-functionality consolidates what would otherwise require separate specialized components in conventional systems, reducing complexity while maintaining precise voltage control for electrofusion welding.
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 a consistent and controlled output voltage for electrofusion welding, extending battery life by efficiently managing voltage levels and allowing for precise control of the heating process, even as the battery energy declines.
Implementation Method 1
The DC to DC power convertors are arranged in a buck-boost configuration which can operate in a boost mode in which the first voltage level is less than the second voltage level and in a buck mode in which the first voltage level is greater than the second voltage level
Implementation Method 2
a current is applied to the wire heating coil which melts adjacent regions of the weld coupler and pipe sections
Data Source
AI summary
A power convertor configured to output power to an electrofusion welding coupler for performing electrofusion welding. The power convertor comprises an array of connected DC to DC power convertor circuits. In use, the array of connected DC to DC power convertor circuits is configured to receive, at a first interface, power at a first voltage level from a battery and output power, at a second interface, at a second voltage level to provide power to electrofusion welding cable means. The DC to DC power convertors are arranged in a buck-boost configuration which can operate in a boost mode in which the first voltage level is less than the second voltage level and in a buck mode in which the first voltage level is greater than the second voltage level.