Localized Solder Joint Heating for Precise PCB Desoldering
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Solution Overview
Problem
Existing methods for desoldering electronic components from printed circuit boards often require heating the entire board, which can introduce moisture and mask faults, and lack precision in targeting the soldered joints.
Innovation Solution
A heating device with specific electrical-connection and heating means is used to target and melt soldered joints between electronic components and the board, allowing selective heating and desoldering without affecting adjacent components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the entire printed circuit board is heated using a bell to melt solder, then the soldered joints are effectively melted for desoldering, but moisture ingress into the board and electronic components occurs and faults may be masked
Solution Approach 1:
The heating device concentrates thermal energy specifically at the soldered joint location through a focused heating element positioned directly against the joint, while the rest of the printed circuit board remains at ambient temperature. This localized heating approach melts the solder for desoldering without subjecting the entire board to elevated temperatures that would cause moisture ingress or mask faults.
2Temperature
If a bell is used to heat the electronic component and printed circuit board, then soldered joints can be melted, but the heating is not precise and affects adjacent components
Solution Approach 1:
The heating element is designed with a focused geometry that concentrates thermal energy precisely at the target soldered joint, creating a localized high-temperature zone. The heating device can be positioned and oriented to apply heat only where needed, preventing thermal spread to adjacent components and circuits.
Solution Approach 2:
The heating device acts as an intermediary tool that transfers thermal energy from a power source directly to the specific soldered joint location. This intermediary mechanism provides controlled, precise heating without requiring blanket heating of the entire board, enabling selective desoldering of specific components.
3Temperature
If the electronic component is placed in an oven for heating, then the entire board is heated uniformly, but this causes moisture-related faults to disappear and reduces diagnostic accuracy
Solution Approach 1:
Instead of uniform oven heating that raises the temperature of the entire board and masks moisture-related faults, the heating device applies localized thermal energy only to the specific soldered joint requiring desoldering. This preserves the ambient temperature of the rest of the board, maintaining any moisture-induced fault conditions for accurate diagnosis.
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 enables precise desoldering of components while minimizing thermal impact on the board, improving fault diagnosis reliability and reducing the risk of moisture ingress.
Implementation Method 1
heating means suitable for reaching a temperature at least equal to the melting point of the material of which the solder is made
Implementation Method 2
heating means suitable for reaching a temperature at least equal to the melting point of the material of which the solder is made
Implementation Method 3
reaching a temperature at least equal to the melting point of the material of which the solder is made
Data Source
AI summary
A heating device suitable for heating at least one soldered joint between an electronic component including at least a first contact mound and a printed circuit board. The soldered joint on the one hand securing the electronic component to the printed circuit board and on the other hand, while providing electrical continuity, the electronic component also having an electronic-component width, and an electronic-component thickness, wherein it includes an electrical-connection suitable for being coupled to an electrical power supply and a heater suitable for reaching a temperature at least equal to the melting point of the solder.