Power Supply Control Apparatus Temperature Calculation Suspension
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Solution Overview
Problem
Existing power supply control apparatuses consume high power due to continuous time-series calculation of temperature differences, even when the calculated difference is zero, leading to inappropriate switching off of power supply and potential risks of overheating.
Innovation Solution
A power supply control apparatus that suspends time-series calculation of temperature differences when the switch is off and resumes it by setting an initial temperature difference based on the elapsed time since suspension, using equations such as ΔTc=ΔTp×exp(−te/τ) or ΔTc=−As×te+ΔTs to approximate the actual temperature difference, thereby reducing power consumption and ensuring accurate temperature calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-series calculation of temperature difference is continuously performed, then temperature monitoring accuracy is maintained, but power consumption remains high
Solution Approach 1:
The patent implements periodic suspension and resumption of time-series calculation based on switch state. When the switch is off, calculation is suspended; when the switch is on, calculation resumes. This periodic action reduces power consumption while maintaining temperature monitoring accuracy during active periods.
Solution Approach 2:
The patent performs preliminary action by storing the last calculated temperature difference value before suspending calculation. When calculation resumes, this stored value is used as the initial temperature difference, eliminating the need to recalculate from zero and ensuring continuous accurate monitoring without unnecessary computation.
2Use of energy by moving object
If time-series calculation is suspended to reduce power consumption, then power consumption decreases, but temperature difference calculation accuracy deteriorates upon resumption
Solution Approach 1:
Before suspending calculation, the system performs preliminary action by storing the last calculated temperature difference value. This stored value serves as the foundation for accurate calculation resumption, ensuring that the initial temperature difference upon resumption reflects the actual thermal state rather than being reset to zero.
Solution Approach 2:
The system uses feedback by continuously monitoring the switch state and using the most recent temperature difference calculation as input for resumption. This feedback mechanism ensures that when calculation resumes, it starts from the correct thermal state, maintaining accuracy while enabling power-saving suspension during inactive periods.
3Device complexity
If initial temperature difference is set to zero upon resumption, then calculation is simplified, but temperature monitoring accuracy deteriorates
Solution Approach 1:
Instead of simplifying by setting initial temperature difference to zero, the system performs preliminary action by storing and retrieving the last calculated temperature difference value. This approach maintains calculation accuracy upon resumption while adding minimal complexity through value storage and retrieval operations.
Solution Approach 2:
The patent introduces an intermediary mechanism (storage of last temperature difference value) that bridges the suspension and resumption phases. This intermediary preserves thermal state information across calculation interruptions, maintaining accuracy without requiring complex recalculation logic upon resumption.
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 reduces power consumption by suspending calculation during periods of low activity and ensures accurate temperature difference calculation upon resumption, preventing overheating and improving safety by correctly switching off power supply when necessary.
Implementation Method 1
calculates the temperature difference between an ambient temperature of the electrical wire and an electrical wire temperature in time series, based on a value of current flowing through the electrical wire
Implementation Method 2
calculate the temperature difference based on a previous temperature difference calculated previously and the value of the current
Data Source
AI summary
A control circuit controls power supplied via an electrical wire, by turning a FET provided on the electrical wire on/off. A control unit calculates the temperature difference between the ambient temperature of the electrical wire and the electrical wire temperature in time series, based on a previous temperature difference between the ambient temperature of the electrical wire 5 and the electrical wire temperature that was calculated previously, and the value of current flowing through the electrical wire. The control unit is configured to suspend this time-series calculation of the temperature difference, and clocks the elapsed time from suspension to resumption of calculation of the temperature difference. The control unit, in the case where calculation of the temperature difference is resumed, sets an initial temperature difference to be used as the previous temperature difference, based on the clocked elapsed time, in an initial calculation of the temperature difference after resumption.