Switch Element Smoking Prevention via Adjusted Heat Dissipation
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Solution Overview
Problem
Conventional power supply control devices do not adequately consider the thermal characteristics of switch elements, leading to a risk of switch element damage when high currents flow, as they only set allowable temperatures based on the smoking characteristics of electrical wires.
Innovation Solution
A power supply control device that includes a switch element, a current detection unit, a temperature estimation unit, and a control unit, which estimates the smoking temperature of the switch element by adjusting the heat dissipation time constant of the electrical wire, ensuring the switch element is turned off before it exceeds its smoking temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the heat dissipation time constant is kept at the electrical wire's actual value, then the temperature estimation accurately reflects the wire's thermal state, but it fails to account for the switch element's different thermal characteristics and lower smoking temperature
Solution Approach 1:
The invention introduces an intermediary approach by using a modified heat dissipation time constant that acts as a mediator between the wire's actual thermal characteristics and the switch element's thermal characteristics. This intermediary parameter allows the system to estimate a temperature that is relevant to the switch element's smoking point without requiring separate temperature sensors for both components.
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
Prevents both electrical wires and switch elements from smoking or igniting by setting an allowable temperature that accounts for the thermal characteristics of both, effectively protecting the switch element from high currents and the electrical wire from prolonged heat exposure.
Implementation Method 1
calculates a temperature difference between the wire ambient temperature and the wire temperature over time based on the value of current flowing through the electrical wire
Implementation Method 2
estimates a wire temperature of the electrical wire based on a thermal resistance, a conductor resistance, the heat dissipation time constant, and the current value
Implementation Method 3
estimates a smoking temperature of the switch element by changing a heat dissipation time constant of the electrical wire used in temperature calculation to a smaller value
Data Source
AI summary
A power supply control device prevents an electrical wire and a switch element from smoking. The power supply control device includes a switch element provided at a midpoint in an electrical wire that connects a power supply and a load. A current detection unit detects the current value of current flowing in the electrical wire. A temperature estimation unit estimates the wire temperature of the electrical wire based on the current value detected by the current detection unit. A control unit turns on or off the switch element based on the wire temperature estimated. The control unit estimates the smoking temperature of the switch element by changing the heat dissipation time constant of the electrical wire used in temperature calculation to a smaller value, and turns off the switch element if the wire temperature is greater than or equal to the estimated smoking temperature of the switch element.