Overheat Detection Circuit for Power System Thermal Control
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Solution Overview
Problem
Existing power systems face challenges in accurately controlling the temperature of the output circuit due to errors in feedback control mechanisms that adjust the duty ratio based solely on output current, which can lead to overheating issues.
Innovation Solution
A power system that includes a control circuit, a power conversion circuit, a current detection circuit, and an overheat detection circuit, where the overheat detection circuit generates a correction current based on the actual temperature of the power conversion circuit, allowing for dynamic adjustment of the feedback control to maintain the temperature within a safe range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control adjusts duty ratio based on output current, then output current control is achieved, but temperature control accuracy deteriorates due to errors in control circuit and non-proportionality between output current and temperature
Solution Approach 1:
The patent introduces a temperature feedback mechanism by adding an overheat detection circuit that directly monitors the temperature of the output circuit. This circuit generates a correction current proportional to the temperature, which is fed back to the control circuit to adjust the duty ratio. This dual feedback (current + temperature) resolves the contradiction by providing accurate temperature information to improve temperature control precision while maintaining output current control reliability
Solution Approach 2:
The patent changes the control parameter from solely output current to a combination of output current and temperature. The overheat detection circuit converts temperature into a correction current parameter that modifies the duty ratio adjustment. This parameter expansion allows the system to account for the non-proportional relationship between current and temperature, thereby improving temperature control accuracy without sacrificing current control reliability
2Device complexity
If feedback control is based solely on output current, then control simplicity is maintained, but temperature monitoring accuracy deteriorates because output current is not proportional to temperature
Solution Approach 1:
The patent introduces an overheat detection circuit as an intermediary component that directly measures temperature and converts it into a correction current. This intermediary bridges the gap between temperature and control signals, providing accurate temperature monitoring without significantly increasing overall system complexity. The correction current serves as a mediator that translates temperature information into actionable control adjustments
Solution Approach 2:
The overheat detection circuit performs multiple functions: it monitors temperature, generates correction current, and integrates with the existing current detection circuit. This multi-functionality allows accurate temperature monitoring to be achieved while maintaining relatively simple control architecture. The correction current mechanism works universally to adjust duty ratio based on both current and temperature conditions
Data Source
AI summary
A power system includes a control circuit, a power conversion circuit, a current detection circuit and a overheat detection circuit. The control circuit is for generating one or more pulse signal. The power conversion circuit is electrically coupled to the control circuit, for generating an output current according to the pulse signal. The current detection circuit is electrically coupled to the power conversion circuit, for generating a sensing current according to the output current. The overheat detection circuit is electrically coupled to the current detection circuit and the control circuit, for generating the correction current according to a temperature of the power conversion circuit. The control circuit adjusts a duty ratio of the pulse signal according to a correction sensing current to adjust the output current, and the correction sensing current is a sum of the value of the sensing current and the correction current.