Induction Trash Can Infrared Circuit Sleep-Wake Standby Power Saving
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Solution Overview
Problem
Conventional induction trash cans have high standby power consumption due to active infrared sensing circuits, leading to short battery life and increased costs, with daily standby power consumption significantly exceeding action power consumption.
Innovation Solution
A power-saving method for induction trash can circuits that incorporates a microcontroller with a sleep function and watchdog timer to control the active infrared sensor's power supply, reducing standby current by intermittently powering the sensor and utilizing a low electricity-consuming chip, thereby extending battery life and reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active infrared sensor operates continuously in standby state, then the sensing function is maintained, but the standby power consumption is high
Solution Approach 1:
The patent implements periodic sensing by controlling the infrared sensor to operate only during watchdog timer intervals. The microcontroller enters sleep mode between timer events, activating the sensor periodically rather than continuously. This periodic operation maintains sensing capability while dramatically reducing standby power consumption from 1.5mA to approximately 0.03mA during sleep periods.
2Speed
If the microcontroller remains in working state continuously, then the response speed is fast, but the power consumption increases
Solution Approach 1:
The patent uses a watchdog timer to preemptively wake the microcontroller from sleep mode before actual sensing is needed. The timer is configured to trigger at optimal intervals, ensuring the microcontroller is awake and ready to respond immediately when the infrared sensor detects a target, while spending most time in low-power sleep state. This preliminary activation maintains fast response capability without continuous operation.
3Measurement precision
If the infrared sensor is always powered on, then the detection accuracy is maintained, but the battery life is short
Solution Approach 1:
The patent implements periodic sensing by controlling the infrared sensor to operate only during watchdog timer intervals. The microcontroller enters sleep mode between timer events, activating the sensor periodically rather than continuously. This periodic operation maintains sensing capability while dramatically reducing standby power consumption from 1.5mA to approximately 0.03mA during sleep periods.
Solution Approach 2:
The patent dynamically adjusts the power state of the infrared sensor based on system needs. The sensor is powered on during watchdog timer intervals for accurate detection, then powered off during sleep periods to conserve battery. This dynamic power management extends battery life from approximately 13 days to potentially several months while maintaining detection accuracy when needed.
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
The method significantly reduces standby current, extends battery life, lowers user costs, and decreases pollution from used batteries by optimizing power usage in induction trash can circuits.
Implementation Method 1
the microcontroller controls the active infrared sensor to emit an infrared pulse signal to the induction area
Data Source
AI summary
An induction trash can circuit includes an active infrared sensor, a microcontroller, a driving circuit and a motor for controlling the opening and closing of a lid. The power-saving method is achieved through the following steps: in a standby state, the microcontroller controls the active infrared sensor to emit an infrared pulse signal to an induction area; if no obstacle exit in the induction area, the active infrared sensor outputs no signals, the program of the microcontroller immediately enters a sleep state; after the program of the microcontroller sleeps for a period of time, a watchdog timer in the microcontroller wakes up the microcomputer controller to make the microcontroller re-enter a working state; and if the microcontroller is in a standby state, the above process is repeated.