Motor Current Feedback Control for Electronic Garbage Can Power Saving
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Solution Overview
Problem
Conventional electronic garbage cans face significant power consumption issues due to inefficient motor control, leading to energy wastage and reduced battery life, especially when the battery voltage is high, causing the motor to remain in a rotation-blocked condition for extended periods.
Innovation Solution
A power-saving control device incorporating a microcomputer control unit, sampling resistor, and analog-digital converter to monitor and compare real-time motor current with a set reference value, immediately stopping power supply when the rotation-blocked condition occurs, thus reducing power consumption and extending battery life without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed rotation time of 1 second is assigned to the motor for lid opening/closing, then the lid can be fully opened and closed even in low battery capacity conditions, but the motor remains in rotation-blocked condition for extended periods when battery voltage is high, causing excessive energy waste
Solution Approach 1:
The patent implements feedback control by continuously monitoring the motor current through a current detection circuit. When the lid reaches the fully opened or closed position, the motor current drops to a predetermined threshold value, triggering the control circuit to immediately stop power supply to the motor. This feedback mechanism replaces the fixed time control with dynamic current-based control, ensuring the lid is fully opened/closed while preventing excessive energy waste during rotation-blocked condition.
Solution Approach 2:
The patent changes the control parameter from fixed time duration to dynamic current threshold. By monitoring motor current as the control parameter and comparing it against a predetermined threshold, the system adapts the power supply duration based on actual motor load conditions. This parameter change enables the motor to stop immediately when the lid reaches the designated position, regardless of battery voltage level, thereby resolving the contradiction between reliability and energy efficiency.
2Loss of energy
If photoelectric sensor or hall-sensor is used to determine when the lid has been opened or closed to the designated position, then the motor can stop power supply timely, but the circuit becomes complex and cost increases
Solution Approach 1:
The patent applies the self-service principle by using the motor's own current characteristics to detect the lid position. The motor current naturally drops to a predetermined threshold value when the lid reaches the fully opened or closed position, providing self-generated feedback signals. This eliminates the need for external sensors like photoelectric or hall-sensors, thereby reducing circuit complexity and cost while achieving timely motor power supply termination.
Solution Approach 2:
The patent makes the motor current serve multiple functions: both driving the motor operation and providing position detection feedback. The same current that powers the motor also contains information about the lid position, which can be used to trigger power supply termination. This multi-functionality approach eliminates the need for separate sensing components, reducing device complexity while maintaining energy efficiency.
3Reliability
If the motor rotation time is extended to 1 second for low voltage conditions, then the lid can be fully opened and closed, but when battery voltage is high, the motor completes the action in only 0.5 second, leaving the motor in rotation-blocked condition for the remaining 0.5 second
Solution Approach 1:
The patent uses feedback control based on motor current monitoring to dynamically adjust the power supply duration. When the lid reaches the fully opened or closed position, the motor current drops to a predetermined threshold, immediately triggering power supply termination. This feedback mechanism ensures the motor operates for exactly the duration needed (0.5 second at high voltage, 1 second at low voltage), preventing unnecessary rotation-blocked condition while ensuring complete lid opening/closing.
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 solution significantly reduces power consumption and extends battery life by promptly stopping motor power during rotation-blocked conditions, achieving up to 3.5 times less energy usage compared to conventional methods while maintaining simplicity and low costs.
Implementation Method 1
a sampling resistor (4) which is connected with an analog-digital converter (21)... the sampling resistor (4) outputs a real-time current analog value
Implementation Method 2
an analog-digital converter (21)... converting the real-time current analog value into a real-time current digital value
Data Source
AI summary
A power-saving control device for operation of an electronic garbage can includes a rotation-blocked current setting register, a sampling resistor, an analog-digital converter, an analog-digital conversion result register, and a comparing unit, which are electrically connected in sequence. The comparing unit compares a current value obtained in real time with a reference current value in the rotation-blocked current setting register, and when the real-time current value is greater than the reference current value, the microcomputer control unit stops supplying power to a motor by controlling the motor positive and negative rotation driving circuit. The power-saving control device has greatly reduced power consumption during operation of an electronic garbage can and a prolonged service life of its battery.