PCB-Based Power Component Temperature Sensing for Electrical Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hot drinks dispensing machines face challenges in effectively controlling the temperature of power components operating at mains voltage while maintaining reinforced electrical insulation, as existing solutions fail to provide reliable and non-bulky temperature monitoring due to distance constraints between high and low voltage components.
Innovation Solution
The electronic system places the temperature sensor on an opposite face of the electronic substrate from the power component, ensuring electrical isolation and allowing for closer proximity without violating insulation requirements, using a thermistor to monitor the triac's temperature and interrupting power supply when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is placed close to the power component on the same side of the PCB, then temperature measurement precision is improved, but electrical insulation requirements are violated
Solution Approach 1:
The patent moves the temperature sensor from the same plane as the power component to the opposite side of the PCB, utilizing the third dimension (depth/thickness of the board) to achieve both close thermal coupling for accurate measurement and sufficient electrical insulation distance. This spatial reconfiguration resolves the contradiction by adding a dimensional aspect to the arrangement.
Solution Approach 2:
The PCB itself acts as an intermediary element between the power component and the temperature sensor. By placing the sensor on the opposite side of the board, the PCB material serves as both a thermal conduction path (through vias and copper traces) and an electrical insulation barrier, enabling the sensor to be close to the power component while maintaining required insulation distances.
2Reliability
If the power component and temperature sensor are placed on opposite faces of the electronic substrate, then electrical insulation is improved, but temperature measurement responsiveness deteriorates
Solution Approach 1:
The patent employs thermal vias and copper traces within the PCB as intermediary thermal conduction paths. These intermediaries bridge the gap between the power component and the temperature sensor on the opposite face, enabling efficient heat transfer that maintains measurement responsiveness despite the physical separation required for electrical insulation.
Solution Approach 2:
The PCB structure with its layered construction and thermal vias acts as a flexible thermal conduction medium. The thin film-like thermal paths through the board thickness allow rapid heat transfer from the power component to the sensor, compensating for the increased distance and maintaining measurement speed.
3Reliability
If the minimum distance of 5 millimeters is maintained between high voltage and low voltage components, then electrical safety is improved, but device compactness deteriorates
Solution Approach 1:
The patent utilizes the vertical dimension (thickness of the PCB) to achieve the required 5mm electrical insulation distance without increasing the horizontal footprint. By placing components on opposite sides of the board and leveraging the board's thickness, the design maintains electrical safety while preserving device compactness in the planar dimensions.
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 enables reliable and responsive temperature measurement of the power component while ensuring electrical safety, reducing the assembly's footprint and meeting regulatory insulation standards, thus preventing overheating and potential malfunctions.
Implementation Method 1
The temperature sensor is a thermistor... quickly perceives said temperature variation
Implementation Method 2
a thermistor to monitor the triac's temperature
Implementation Method 3
a heating element whose temperature is controlled... This is, for example, a resistor that partially dissipates the electrical energy supplied to it in the form of heat
Implementation Method 4
ensuring electrical isolation and allowing for closer proximity without violating insulation requirements
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to an electronic control system for a heating element for a hot beverage dispensing machine, comprising: - an electronic substrate (2) having a first face (2A) and a second face (2B), - at least one operative part of the electronic system having a power component (3) configured to control a power supply to the heating element, - at least one informational part of the electronic system having a temperature sensor (4) configured to generate a signal characteristic of an observed temperature of the power component (3), - means for processing the signal generated by the temperature sensor (4), configured to interrupt the power supply to the power component when said signal exceeds a predetermined threshold, the power component (3) being arranged on the first face (2A) and the temperature sensor being arranged on the second face (2B).