Electric Pump PWM Sleep Control for Low Quiescent Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The microcontroller in electric pump control systems continues to consume power even when the electric pump is stationary, leading to increased quiescent current and power consumption due to its inability to enter a sleep mode when stopped.
Innovation Solution
A mode control method and system that utilizes a pulse-width modulation (PWM) signal to determine the target rotational speed of the electric pump, entering a sleep mode when the speed remains zero for a set duration, thereby reducing power consumption by shutting down peripheral circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the microcontroller continues to run when the electric pump is stationary, then the control system can respond quickly to restart commands, but the quiescent current and power consumption increase significantly
Solution Approach 1:
The microcontroller dynamically adjusts its operating state based on the electric pump's status. When the pump is stationary for an extended period, the microcontroller enters sleep mode to reduce power consumption. When the pump needs to operate, the microcontroller transitions back to working mode, achieving dynamic adaptation between power saving and operational readiness
Solution Approach 2:
The system changes the operational parameters of the microcontroller by switching between working mode and sleep mode. This parameter change includes adjusting the clock frequency, enabling/disabling peripheral circuits, and modifying the operational state based on the pump's rotational speed and duration, thereby optimizing power consumption while maintaining necessary control capabilities
2Use of energy by moving object
If the microcontroller enters sleep mode to reduce power consumption, then energy usage decreases, but the system response time may increase
Solution Approach 1:
The microcontroller performs preliminary actions by maintaining a ready state or entering shallow sleep modes when the pump is temporarily stationary, allowing for faster wake-up and response. The system predicts potential restart needs based on operational patterns, keeping critical functions partially active to minimize response time while still achieving power savings
Solution Approach 2:
The system implements periodic monitoring and status checking mechanisms that allow the microcontroller to efficiently transition between sleep and working modes. By using periodic duty cycles and timed wake-up intervals, the system maintains energy efficiency while ensuring timely response to operational requirements
3Reliability
If the microcontroller remains in working mode continuously, then all control functions are always available, but the quiescent current increases
Solution Approach 1:
The microcontroller's functionality is segmented into critical and non-critical components. During sleep mode, non-critical functions are deactivated while critical control functions remain accessible. This segmentation allows the system to reduce quiescent current by shutting down peripheral circuits while maintaining essential control availability through a streamlined core function set
Solution Approach 2:
An intermediary low-power state is introduced between full working mode and complete shutdown. This intermediate state allows critical control functions to remain available while non-essential functions are suspended, effectively reducing quiescent current while maintaining necessary system reliability and control capability
Data Source
AI summary
Provided is a mode control method that includes obtaining a PWM signal; obtaining a duty cycle of the PWM signal; obtaining a target rotational speed of an electric pump based on the duty cycle of the PWM signal; in response to determining that the target rotational speed of the electric pump is equal to 0 and the target rotational speed of the electric pump remains equal to 0 for the set duration, entering the sleep mode by the microcontroller; and in response to determining that the target rotational speed of the electric pump is not equal to 0 or the target rotational speed of the electric pump does not remain equal to 0 for the set duration, entering the working mode by the microcontroller. Further provided are a mode control system, an electronic device and a storage medium.