Electric Heater Ramp-Up Control Using Dynamic Current Feedback
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Solution Overview
Problem
Existing thermal systems with resistive heating elements face inefficiencies in reaching temperature setpoints due to standard ramp rates, resulting in non-productive manufacturing time and potential overheating or underheating issues.
Innovation Solution
A method and control system that dynamically adjust the ramp rate of power applied to resistive heating elements based on temperature changes and electric current levels, allowing for variable ramp rates and reducing the risk of overheating by monitoring and adjusting the power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standard ramp rate is used to reach the temperature setpoint, then the heater can be controlled in a simple manner, but the time spent changing temperature increases, resulting in non-productive manufacturing time
Solution Approach 1:
The patent implements dynamic ramp rate adjustment by continuously monitoring the heater's temperature and comparing it to the setpoint. The control system modifies the ramp rate in real-time based on the temperature differential, allowing faster heating when the gap is large and slower heating when approaching the setpoint. This dynamic approach reduces total ramp time while maintaining temperature precision, directly addressing the productivity-time loss contradiction.
Solution Approach 2:
The system changes the heating parameter (ramp rate) from a fixed standard value to a variable value that adapts based on temperature conditions. By adjusting the power delivery parameters dynamically, the system optimizes the heating process to minimize time loss without sacrificing manufacturing productivity, resolving the contradiction between fast heating and precise temperature control.
2Productivity
If a higher ramp rate is applied to reduce temperature ramp time, then productivity improves, but the risk of overheating and temperature control issues increases
Solution Approach 1:
The patent employs continuous feedback control by monitoring the heater's temperature and using this information to adjust the power delivery. The control system compares the actual temperature to the setpoint and dynamically modifies the ramp rate to prevent overheating. This feedback mechanism maintains reliability by ensuring temperature stability even during rapid heating, resolving the contradiction between productivity and temperature control stability.
Solution Approach 2:
The system transitions from a static, fixed ramp rate to a dynamic ramp rate that automatically adjusts based on real-time temperature conditions. When the heater approaches the setpoint or shows signs of overheating, the ramp rate is automatically reduced, preventing temperature control issues while maintaining high productivity during the heating phase.
3Manufacturing precision
If a variable ramp rate is implemented to optimize heating efficiency, then temperature control precision improves, but the device complexity increases
Solution Approach 1:
The patent uses feedback control to achieve precise temperature setpoint accuracy. By continuously monitoring temperature and adjusting the ramp rate based on the differential between actual and target temperatures, the system maintains high manufacturing precision. The feedback mechanism automates the complexity, requiring minimal additional hardware while significantly improving temperature control accuracy.
Solution Approach 2:
The control system performs self-adjustment by automatically modifying the ramp rate based on temperature feedback without requiring external intervention. This self-service capability handles the increased complexity internally, allowing the system to maintain precise temperature control while keeping the user interface and operational complexity minimal.
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 approach enables more efficient and controlled temperature adjustments in thermal systems, reducing non-productive time and preventing overheating or underheating by dynamically managing the power delivery to the heating elements.
Implementation Method 1
a heater having resistive heating elements
Data Source
AI summary
A method for controlling temperature of a heater including a resistive heating element. The method includes applying power to the resistive heating element of the heater at a variable ramp rate to increase temperature of the heater to a desired temperature setpoint. The variable ramp rate is set to a desired ramp rate. The variable ramp rate varies based on a temperature change of the resistive heating element with respect to time, and a control system dynamically adjusts the variable ramp rate to define different rates of ramping the applied power. The method further includes monitoring an electric current flowing through the resistive heating element of the heater, and reducing the variable ramp rate from the desired ramp rate to a permitted ramp rate in response to the electric current being greater than a lower limit of an electric current limit band.