Lighting Device with Phase-Inverted Light Strings
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Solution Overview
Problem
Human visual fatigue and stress caused by prolonged exposure to flickering lighting environments, which can lead to dizziness, eye pressure, and decreased visual acuity, necessitate a solution for managing flickering light effectively in lighting devices.
Innovation Solution
A lighting device configuration featuring a driving power source, a first light string, a second light string, a constant current controller, and a pulse width modulation controller, where the second light string emits flickering light with controlled pulse frequency, and the first light string is 180 degrees out of phase with the second, reducing human visual perception of flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lighting device uses visible flickering light to meet specific requirements, then certain therapeutic or stimulation requirements are complied with, but human visual fatigue and stress increase
Solution Approach 1:
The lighting device is divided into multiple light strings (first light string and second light string) that can be independently controlled. The second light string produces flickering light for therapeutic purposes while the first light string produces non-flickering light to compensate for visual fatigue, segmenting the functional roles within a single device.
Solution Approach 2:
Different parts of the lighting device have different lighting characteristics - the second light string provides flickering light with specific pulse frequencies for therapeutic effects, while the first light string provides stable non-flickering light. Each light string has localized different quality to fulfill different functions simultaneously.
2Adaptability or versatility
If the second light string emits flickering light at controlled pulse frequency for therapeutic purposes, then specific diseases or symptoms can be treated, but human visual perception of flicker increases
Solution Approach 1:
The first light string is driven by a pulsating current that is 180 degrees out of phase with the second light string. This preliminary anti-action compensates for the flicker produced by the second light string, reducing the net flicker perceived by human vision while maintaining the therapeutic pulse frequency stimulation.
3Device complexity
If a single light string is used to provide both therapeutic flickering light and stable illumination, then device complexity is reduced, but the ability to provide both flickering and non-flickering light simultaneously is compromised
Solution Approach 1:
The lighting device achieves multi-functionality by incorporating multiple light strings that can operate in different modes. The device can provide both flickering light for therapy and non-flickering light for general illumination simultaneously, with each light string serving multiple potential functions based on control settings.
Data Source
AI summary
A lighting device includes a driver, a first light string, a second light string, a constant current controller and a pulse width modulation controller. The driver is configured to provide a DC driving current to a shunt node. The first light string is electrically coupled between the shunt node and a ground terminal, and the first light string is driven by a first pulsating direct current. The second light string and the constant current controller are electrically coupled in series between the shunt node and the ground terminal. The pulse width modulation controller is configured to provide a pulse signal to the constant current controller, and the constant current controller controls a pulse frequency of a second pulsating direct current supplied for the second light string according to the pulse signal.