Anti-Interference Lighting Circuit with Segmented Pull-Up Resistors
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Solution Overview
Problem
Current lighting devices suffer from self-interference issues, where direct irradiation of light onto photosensitive components causes flickering or reduced brightness, and mutual interference occurs when multiple devices are turned on simultaneously, limiting their application range.
Innovation Solution
A lighting device with an anti-interference light control circuit that includes a photosensitive element, pull-up resistors, a current-limiting detecting resistor, a controller, and a pull-up resistance adjusting circuit, which provides a special pull-up resistance adjusting mechanism and time delay control to mitigate interference from ambient light changes and self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photosensitive component is used in the light control circuit, then the device can detect ambient light to control the light source, but self-interference occurs when the light source directly irradiates the photosensitive component, causing flickering or reduced brightness
Solution Approach 1:
The patent divides the pull-up resistance into two separate resistors: a first pull-up resistor connected to the photosensitive component and a second pull-up resistor connected to the controlling end of the switch. This segmentation isolates the photosensitive component from direct interference by the light source, preventing self-interference while maintaining light control functionality.
Solution Approach 2:
The patent introduces a controller as an intermediary between the photosensitive component and the light source driver. The controller processes the detection signal from the photosensitive component and generates the control signal for the light source, preventing direct interference while enabling sophisticated control functions including anti-interference mechanisms.
2Illumination intensity
If multiple lighting devices are turned on simultaneously, then the lighting coverage is improved, but mutual interference occurs between devices, affecting the application range
Solution Approach 1:
The patent segments the control circuit into independent units with separate pull-up resistors and controllers for each device. This allows multiple devices to operate independently without mutual interference, as each device's photosensitive component only responds to its own light source through the isolated circuit architecture.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by introducing separate pull-up resistors with specific resistance values, which modifies the detection signal characteristics and enables the controller to distinguish between self-light and external light sources, preventing mutual interference between multiple devices.
3Device complexity
If a simple light control circuit is used, then the device complexity is reduced, but the circuit cannot effectively prevent interference from ambient light changes
Solution Approach 1:
The patent maintains relative circuit simplicity while adding anti-interference capability by segmenting the pull-up resistance into two resistors and adding a controller. This modular approach enhances reliability without significantly increasing overall complexity, as the segmentation provides clear functional separation.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the detection signal from the photosensitive component and adjusts the control signal accordingly. This feedback loop enables the system to distinguish between legitimate ambient light changes and self-interference, improving anti-interference performance while maintaining manageable circuit complexity.
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 effectively prevents abnormal flickering and brightness reduction, ensuring stable light output and enhanced performance, making the device suitable for various environments and applications while maintaining a simple and cost-effective design.
Implementation Method 1
The light control circuit of currently available lighting devices is composed of a photosensitive component (such as a photoresistor, photodiode, etc.)
Data Source
AI summary
A lighting device includes a photosensitive element, a first pull-up resistor, a light source driver, a current-limiting detecting resistor, a controller and a pull-up resistance adjusting circuit. The two ends of the photosensitive element are respectively connected to a first node and a grounding point. The two ends of the first pull-up resistor are respectively connected to the first node and a second node (connected to an operating voltage source). The detecting signal input end of the controller is connected to the first node via the current-limiting detecting resistor. The voltage input end of the controller is connected to the second node. The driving signal output end of the controller is connected to the light source driver. The first end, second end and third end of the pull-up resistance adjusting circuit are respectively connected to the first node, second node and control signal output end.