Illuminating Device Control Circuit for Gradual Brightness Adaptation
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Solution Overview
Problem
Current illuminating devices abruptly change brightness when turned on or off, causing discomfort and potential temporary blindness, especially at night, as they reach maximum brightness within 1 second, which is undesirable for human adaptation.
Innovation Solution
A control circuit for illuminating devices that includes a detecting unit, central control unit, and illumination mode control unit, allowing the device to automatically adjust between daylight and night operation modes based on ambient brightness, using a photoresistive element and voltage-dividing resistor for detection and a reference voltage adjusting circuit for gradual brightness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illuminating device reaches maximum brightness within 1 second when turned on, then the illumination intensity is improved, but the human eye adaptation deteriorates causing discomfort and temporary blindness
Solution Approach 1:
The patent implements periodic action by using a pulse width modulation (PWM) signal to control the illuminating device. The PWM signal alternates between on and off states, creating a periodic control pattern that enables gradual brightness increase through duty cycle adjustment, thereby resolving the contradiction between rapid illumination and eye adaptation
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the duty cycle of the PWM signal over time. The duty cycle parameter is increased gradually from 0% to 100%, which controls the average brightness of the illuminating device to increase progressively, allowing human eyes to adapt while still achieving maximum illumination intensity
2Ease of operation
If manual control methods such as wall adjustors or remote controls are used, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent implements self-service by incorporating an ambient light sensor that automatically detects the surrounding light conditions and adjusts the illuminating device's brightness accordingly. This eliminates the need for manual wall adjustors or remote controls, reducing device complexity while maintaining ease of operation through automatic adaptation to environmental lighting
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 enables illuminating devices to turn on and off gradually, reducing eye strain and discomfort by automatically adapting to ambient light conditions, thus improving user satisfaction with a compact and cost-effective design.
Implementation Method 1
the detecting unit includes a first serial branch formed by a photoresistive element and a voltage-dividing resistor that are serially connected for detecting the ambient brightness
Data Source
AI summary
The present invention relates to a control circuit for an illuminating device, characterized in that the control circuit comprises a detecting unit, a central control unit and an illumination mode control unit, the detecting unit detects ambient brightness and generates a detection signal, the central control unit controls the illumination mode control unit, according to the detection signal, to generate a plurality of first driving signal enabling the illuminating device to operate in a first illumination mode or a plurality of second driving signal enabling the illuminating device to operate in a second illumination mode. The control circuit can automatically adjust the illuminating device to be in different operation modes according to different ambient brightness.