Switching Circuit with Tunable Capacitor for IoT Load Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of Internet of Things (IoT) systems, loads such as illuminating devices can be inadvertently activated due to high current peak or average values, leading to inefficiencies and potential safety issues.
Innovation Solution
A switching circuit incorporating a live wire power obtaining circuit, a control circuit, and a tunable capacitor array that performs zero-crossing detection to manage power supply, reducing current peak and average values by strategically charging or discharging the capacitor array based on switch states and detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the control circuit continuously scans all channels, then the network module can detect all available devices, but the current peak value and average value become too high causing loads to be activated by mistake
Solution Approach 1:
The control circuit implements periodic channel scanning instead of continuous scanning. The scanning unit scans channels periodically at predetermined intervals, and the sleeping unit allows the processor to enter sleeping mode between scans. This periodic operation reduces the current peak value and average value to prevent load activation while still maintaining the ability to detect available devices.
Solution Approach 2:
The scanning unit performs channel scanning in advance before the processor enters sleeping mode. By completing the scanning operation beforehand, the system ensures that device detection is performed before the high-current period, thus avoiding load activation during the scanning process.
2Measurement precision
If the processor operates continuously to scan channels, then device detection is thorough, but energy consumption increases causing load activation
Solution Approach 1:
The processor alternates between operating mode and sleeping mode. The scanning unit performs device detection when the processor is active, then the processor enters sleeping mode to conserve energy. This periodic operation pattern reduces energy consumption and current draw while maintaining device detection capability.
Solution Approach 2:
The scanning function is extracted and performed by a dedicated scanning unit that operates independently during active periods. This allows the main processor to enter sleeping mode while the scanning unit completes its detection tasks, separating the detection function from continuous processor operation.
3Use of energy by moving object
If the control circuit enters sleeping mode frequently to save energy, then current consumption decreases, but device detection may be missed
Solution Approach 1:
The scanning unit performs channel scanning in advance before the processor enters sleeping mode. By completing the scanning operation beforehand, the system ensures that device detection is performed while the processor is still active, thus avoiding missed detections while still enabling energy-saving sleeping mode operation.
Solution Approach 2:
The control circuit monitors the operational state and uses feedback to determine when to switch between scanning and sleeping modes. The scanning unit detects available devices and provides feedback to the control logic, which then manages the processor's operational and sleeping states to balance detection reliability with energy conservation.
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
Effectively prevents unintended activation of loads by managing current values, ensuring stable operation of IoT systems and extending the life of energy storage components by avoiding high current peaks.
Implementation Method 1
The live wire power obtaining circuit is coupled to a live wire to receive an alternating current voltage
Implementation Method 2
The control circuit is configured to perform a zero-crossing detection to the alternating current voltage
Implementation Method 3
The tunable capacitor array is coupled to the live wire power obtaining circuit and the control circuit. The control circuit is configured to control the live wire power obtaining circuit to supply power to the control circuit or the tunable capacitor array to discharge to supply power to the control circuit
Data Source
AI summary
A switching circuit includes a live wire power obtaining circuit, a control circuit, and a tunable capacitor array. The live wire power obtaining circuit is coupled to a live wire to receive an alternating current (AC) voltage. The control circuit is configured to perform a zero-crossing detection to the alternating current voltage. The tunable capacitor array is coupled to the live wire power obtaining circuit and the control circuit. The control circuit is configured to control the live wire power obtaining circuit to supply power to the control circuit or the tunable capacitor array to discharge to supply power to the control circuit based on a state of a first switch and a zero-crossing detection result.