Periodic Wake-Sleep Sensing Control for Low-Power IoT Nodes
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Solution Overview
Problem
The high initial and maintenance costs associated with powering and maintaining a large number of sensing devices in IoT systems due to their high power consumption.
Innovation Solution
A sensing device with a microprocessor that periodically activates to control power supply to the controller, sensing element, and communication element, allowing for efficient power management by sleeping after data transmission to reduce overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sensing devices are deployed in large numbers for IoT systems, then the sensing coverage and data collection capability are improved, but the initial cost and maintenance cost increase due to required power supply wirings
Solution Approach 1:
The patent extracts the power supply function from external centralized power infrastructure and relocates it to individual sensing devices through integrated battery power supplies. This allows each sensing device to operate independently without requiring external power wiring, thereby reducing initial installation costs while maintaining large-scale deployment capability for IoT systems
Solution Approach 2:
The patent segments the power supply system from a centralized external source into distributed individual battery power supplies at each sensing device. This segmentation enables independent operation of each device, eliminating the need for complex power distribution wiring across the network while allowing flexible deployment of numerous sensing devices
2Reliability
If sensing devices operate continuously to ensure data collection, then the data availability is improved, but the power consumption increases leading to higher maintenance costs
Solution Approach 1:
The patent implements periodic action through the microprocessor's sleep mode operation, where the device alternates between active sensing/communication states and low-power sleep states. The microprocessor periodically wakes up to control the sensing element and communication element, then returns to sleep mode, thereby maintaining data collection functionality while significantly reducing average power consumption compared to continuous operation
Solution Approach 2:
The patent applies dynamics by making the power supply state variable rather than static. The power supply dynamically switches between active and sleep modes based on operational requirements, with the microprocessor controlling the timing and duration of active periods. This dynamic power management allows the system to adapt power consumption to actual data collection needs, ensuring data availability while minimizing energy usage
Data Source
AI summary
A sensing device includes a power supply, a sensing element, a communication element, a controller and a microprocessor. The controller is configured to control the sensing element and the communication element. The microprocessor is configured to be activated from the sleep state periodically according to a time period. The microprocessor is configured to control the power supply to supply power to the controller, the sensing element and the communication element, such that the sensing element senses the environment to acquire a plurality of sensing values. After the communication element transmits the sensing values to a server, the microprocessor controls the power supply to stop supplying power to the controller, the sensing element and the communication element, and also the microprocessor enters the sleep state.