CPAP Controller Power Allocation for Humidifier and Tube Heater
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Solution Overview
Problem
Existing CPAP devices do not effectively manage power supply to humidifiers and heating pipes, leading to potential impairment of air temperature and humidity levels, which can affect user comfort and therapy efficacy.
Innovation Solution
A CPAP device with a controller that calculates and adjusts the power supply to the blower, tube heater, and humidifier, ensuring that the sum total of power consumption does not exceed a predetermined limit by prioritizing power to the blower and tube heater while minimizing the impact on the humidifier, thereby maintaining air temperature and humidity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the controller decreases supply power to the humidifier and heating pipe when power consumption exceeds rated power, then the overall power consumption is controlled within limits, but the air temperature and humidity levels may deteriorate, affecting user comfort
Solution Approach 1:
The controller dynamically adjusts power allocation between the humidifier and heating pipe based on real-time power consumption levels. When power consumption exceeds the rated value, the controller selectively decreases power to the heating pipe while maintaining or adjusting humidifier power, creating a dynamic power management system that adapts to varying power availability while preserving thermal comfort.
Solution Approach 2:
The controller changes the power supply parameters to individual components (humidifier and heating pipe) rather than applying uniform power reduction. By independently controlling the power parameters of each component, the system can optimize the balance between power consumption limits and maintaining adequate air temperature and humidity levels for user comfort.
2Power
If the controller decreases supply power to the humidifier and heating pipe when power consumption exceeds rated power, then the overall power consumption is controlled within limits, but the air humidity levels may deteriorate, affecting user comfort
Solution Approach 1:
The controller dynamically adjusts power allocation between the humidifier and heating pipe based on real-time power consumption levels. When power consumption exceeds the rated value, the controller selectively decreases power to the heating pipe while maintaining or adjusting humidifier power, creating a dynamic power management system that adapts to varying power availability while preserving thermal comfort.
Solution Approach 2:
The controller changes the power supply parameters to individual components (humidifier and heating pipe) rather than applying uniform power reduction. By independently controlling the power parameters of each component, the system can optimize the balance between power consumption limits and maintaining adequate air temperature and humidity levels for user comfort.
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
This solution ensures that air temperature and humidity levels are maintained, preventing user discomfort and ensuring continuous therapy effectiveness even when power consumption exceeds initial limits, by gradually reducing power to the humidifier and maintaining heating functions.
Implementation Method 1
a tube heater that heats the air in the tube
Implementation Method 2
a humidifier that humidifies the air blown into the tube
Data Source
AI summary
A CPAP device includes a blower, a tube heater, a humidifier, and a controller that controls power supply to these components. The controller calculates each of first supply power to the blower, second supply power to the tube heater, and third supply power to the humidifier. The controller provides the first supply power to the blower and the second supply power to the tube heater. In contrast, the controller provides, to the humidifier, lower one of the third supply power and remainder power obtained by subtracting the first supply power and the second supply power from the predetermined upper limit. If the sum total of the first supply power to the third supply power exceeds the upper limit, the controller decreases the second supply power until the sum total decreases to or below the upper limit.