LED Bypass Switch Circuit for Vehicle Lighting Continuity
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Solution Overview
Problem
The complexity of lighting circuits using LEDs in vehicle lighting devices can lead to poor continuity issues, such as contact failures or disconnections, which are difficult to manage effectively with existing bypass systems.
Innovation Solution
A light source control device with a driver circuit, first and second bypass switches, and an abnormality detection auxiliary circuit that forces both bypass switches on when poor continuity is detected, ensuring proper operation even with line discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bypass switch is disposed in parallel to each LED to enable individual switch-on/off control, then fine light distribution control is achieved, but the lines around the LEDs become complicated and the possibility of poor continuity increases
Solution Approach 1:
The patent merges the control of two adjacent LEDs (2n-1 and 2n) into a single bypass switch unit. Each bypass switch controls two LEDs simultaneously, reducing the total number of bypass switches and connection lines by half compared to individual LED control, thereby simplifying the circuit while maintaining control functionality.
Solution Approach 2:
The patent segments the LED array into groups of two adjacent LEDs controlled by one bypass switch. This segmentation strategy divides the complex individual control problem into manageable units, where each unit controls a pair of LEDs, reducing overall system complexity while preserving control capability.
2Ease of operation
If multiple bypass switches are used to control individual LEDs, then light distribution control is improved, but the reliability of the lighting circuit deteriorates due to increased contact failures and disconnections
Solution Approach 1:
By merging the control function for two LEDs into one bypass switch, the patent reduces the total number of switches and connection points in the circuit. Fewer connection points mean fewer potential failure locations, thereby improving reliability while maintaining the ability to control light distribution effectively.
Solution Approach 2:
The patent converts the potential harm of complex wiring into a benefit by demonstrating that controlled simplification through paired LED control actually improves reliability. The reduced complexity directly translates to fewer contact failures and disconnections, turning the initial problem of complexity into a solution that enhances system reliability.
3Device complexity
If bypass switches are connected in series to reduce line complexity, then the number of connection lines is reduced, but the ability to individually control LEDs is limited
Solution Approach 1:
The patent applies local quality by making each bypass switch unit have a specific localized function of controlling exactly two adjacent LEDs. This localized control approach maintains flexibility within each unit while reducing overall complexity, as each switch independently controls its designated pair without affecting other units.
Solution Approach 2:
The patent creates a dynamic control system where bypass switches can be selectively activated in different patterns. By controlling pairs of LEDs rather than individuals, the system offers flexible lighting patterns (such as controlling odd or even positioned LEDs) while maintaining simpler wiring, providing dynamic adaptability without excessive complexity.
Data Source
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AI summary
A light source control device comprises a first bypass switch connected in parallel to one part of semiconductor light sources, and a second bypass switch connected in series to the first bypass switch and in parallel to another part of the semiconductor light sources. In a connection line connecting a connection node between the first and the second bypass switches and a connection node between the one part and the another part of the semiconductor light sources, a polarity of a current flowing in the connection line when the first bypass switch is off and the second bypass switch is on is opposite to a polarity of the current flowing in the connection line when the first bypass switch is on and the second bypass switch is off. When a poor continuity is generated in the connection line, the first and the second bypass switches are forcedly turned on.