Power Control Device Calibration via Microcontroller PWM
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Solution Overview
Problem
Conventional dimmer and fan speed control devices are not compatible with various types of lighting and motor loads, limiting their ability to adjust power settings effectively, and often require expensive and bulky trim potentiometers for calibration, which is costly and unsafe.
Innovation Solution
A power control device with a user-settable control knob, calibration button, and regulation circuit that allows for wide-range power setting calibration, using a microcomputer to control PWM signals and optimize power delivery to different loads, including LED and CFL devices, through a series pass element and zero-cross detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional trim potentiometers are used for calibration, then power control device can be calibrated, but the device becomes expensive and bulky
Solution Approach 1:
The patent replaces the mechanical trim potentiometer with an electronic calibration system using a push-button interface and microcontroller. The microcontroller reads calibration values from non-volatile memory and configures the PWM duty cycle accordingly, eliminating the need for physical potentiometers and reducing device complexity while maintaining calibration precision.
Solution Approach 2:
The patent stores calibration values in non-volatile memory (EEPROM or Flash) instead of using physical potentiometers. This allows the calibration settings to be copied and retained without requiring mechanical adjustment components, reducing both size and cost while preserving the ability to accurately set power control parameters.
2Measurement precision
If power control device is designed for specific load types, then control precision is improved, but adaptability to different load types decreases
Solution Approach 1:
The patent implements a universal power control device that can work with multiple load types (incandescent, CFL, LED, motor loads) through automatic load detection and adaptive PWM control. The microcontroller identifies the load type and adjusts control parameters accordingly, maintaining precision across different applications while maximizing versatility.
Solution Approach 2:
The patent uses dynamic control parameters that automatically adjust based on the detected load type. The PWM duty cycle, frequency, and other control parameters are modified in real-time according to the load characteristics, allowing precise control for each specific load type while maintaining a single universal device design.
3Device complexity
If simple ON/OFF switch is used, then device simplicity is maintained, but energy saving capability is lost
Solution Approach 1:
The patent implements periodic PWM control where power is delivered in pulsed cycles rather than continuously. By adjusting the duty cycle of these periodic pulses, the device maintains simplicity while enabling energy savings through variable power delivery to lights and motors, eliminating the need for complex continuous analog control circuits.
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
Enables safe, cost-effective, and efficient power control over a wide range of settings for various electrical loads, reducing energy consumption and extending lamp life, while maintaining compatibility with diverse lighting and motor types.
Implementation Method 1
using a microcomputer to control PWM signals and optimize power delivery to different loads
Implementation Method 2
through a series pass element and zero-cross detection
Data Source
AI summary
The present invention is directed to an electrical wiring device that includes a housing assembly having a plurality of terminals at least partially disposed therein, the plurality of terminals being configured to be coupled to an AC power source and at least one electrical load, the plurality of terminals being configured to provide the electrical wiring device with regulated AC power in a device energized state. At least one variable control mechanism is coupled to the housing assembly, the at least one variable control mechanism being configured to regulate power to the at least one electrical load by way of a control knob being user settable between a first adjustment stop and a second adjustment stop. A user accessible calibration button is included. At least one series pass element coupled to the at least one variable control mechanism, the at least one series pass element being configured to provide load power to the at least one electrical load in accordance with a user setting of the control knob. A regulation circuit is coupled to the user accessible calibration button and the at least one series pass element, the regulation circuit being configured to enter a calibration mode when the control knob is at or near the first adjustment stop or the second adjustment stop and the user manually actuates the calibration button, the regulation circuit establishing at least one pre-determined load power setting when the calibration button is actuated when the regulation circuit is in the calibration mode.