Temperature Sensing Device Using Diode Capacitor Switching
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Solution Overview
Problem
Existing temperature sensing devices are limited in their ability to efficiently measure multiple temperatures simultaneously, particularly in wearable electronic devices, where accurate and versatile temperature monitoring is crucial.
Innovation Solution
A temperature sensing apparatus comprising at least one first diode and one second diode, a capacitor, and control circuitry that switches between charging and discharging configurations to measure two different temperatures by determining the time taken to charge and discharge the capacitor through each diode, allowing for simultaneous measurement of distinct temperature regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single temperature sensor is used, then the device complexity is reduced, but the ability to measure multiple temperatures simultaneously is limited
Solution Approach 1:
The patent applies multi-functionality by enabling a single temperature sensing apparatus to measure multiple temperatures simultaneously through sequential charging and discharging operations. The same capacitor and diode are reused in different configurations to capture temperature data from multiple regions, eliminating the need for separate sensor circuits for each temperature measurement point.
Solution Approach 2:
The patent implements periodic action through alternating charging and discharging cycles of the capacitor. During charging phases, the diode senses one temperature; during discharging phases, the same components sense another temperature. This periodic switching between measurement modes allows multiple temperature readings to be obtained sequentially from a single apparatus, resolving the contradiction between measurement versatility and device complexity.
2Measurement precision
If multiple temperature measurements are performed sequentially, then measurement precision is improved, but the measurement time increases
Solution Approach 1:
The patent uses rapid periodic switching between charging and discharging modes to perform multiple temperature measurements in quick succession. The capacitor charges through the diode during one phase and discharges through the same diode during another phase, with each phase providing a temperature measurement. This periodic operation enables multiple precise measurements without requiring extended time periods, as the switching occurs rapidly between measurement cycles.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that the temperature measurement process continues uninterrupted through alternating charge and discharge cycles. Rather than pausing between measurements, the system continuously alternates between charging (providing one temperature reading) and discharging (providing another temperature reading), thereby achieving multiple precise measurements within a compressed time frame without idle periods.
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
Enables accurate and efficient measurement of two different temperatures using the same apparatus, with the option to connect multiple diodes in parallel for enhanced current and reduced measurement time, suitable for wearable electronic devices and energy harvesting applications.
Implementation Method 1
The capacitor is charged by a reverse saturation current flowing throughout the reverse biased diode.
Implementation Method 2
the time taken to discharge the at least one capacitor to a lower threshold provides an indication of a second temperature
Data Source
Figure 1~2B
Figure 3~4
AI summary
The application relates to a temperature sensing apparatus and devices such as wearable devices or energy harvesting devices which may comprise temperature sensing apparatus. The temperature sensing apparatus comprises at least one first diode and at least one second diode, at least one capacitor configured to be charged though the at least one first diode and discharged through the at least one second diode, and at least one switch having a first configuration and a second configuration. When the at least one switch is in the first configuration it enables the at least one capacitor to be charged through the at least one first diode and when the at least one switch is in the second configuration it enables the at least one capacitor to be discharged through the at least one second diode. The apparatus also comprises control circuitry configured to enable the at least one switch to be switched between the first configuration and the second configuration.