LED Headlight Matrix Control With Series-Shunt Driver Reduction
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Solution Overview
Problem
Current LED-based vehicle headlight designs with individual LED drivers for each LED string are inefficient, leading to high power consumption, increased heat generation, and poor system efficiency due to the need for multiple drivers and parallel connections.
Innovation Solution
A series-shunt topology where multiple LEDs are connected in series to a single driver, utilizing shunts for individual control of LED functions, and employing time division multiplexing, angle domain multiplexing, and volt-second analysis to manage electrical flow, reducing the number of drivers and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual LED drivers are used for each LED string in parallel connection, then each LED can be independently controlled, but the system complexity and power consumption increase significantly
Solution Approach 1:
Multiple LED strings that were previously controlled by separate driver circuits are merged into a single series-connected string controlled by one driver circuit. The patent connects LED strings in series configuration where a single driver circuit controls the entire chain, eliminating the need for multiple parallel drivers and reducing system complexity while maintaining independent control capability through selective activation of different LED groups.
Solution Approach 2:
A single driver circuit is designed to control multiple LED strings that serve different functions (low beam, high beam, turn signals, daytime running lights). The driver circuit universally controls all these different LED functions by selectively activating specific LEDs or groups of LEDs within the series-connected string, making one driver perform the work of multiple dedicated drivers.
2Adaptability or versatility
If multiple LED driver circuits are used in parallel configuration, then each LED function can be driven independently, but power consumption and heat generation increase
Solution Approach 1:
The patent merges multiple parallel LED driver circuits into a single series-connected driver system. By connecting LED strings in series and using one driver circuit to control the entire chain, the system reduces the number of active components and minimizes power consumption associated with multiple driver circuits operating simultaneously in parallel configuration.
Solution Approach 2:
The system uses time-division multiplexing where different LED functions (low beam, high beam, turn signals) are activated at different time intervals rather than simultaneously. The single driver circuit periodically switches between controlling different LED groups, allowing each function to operate independently in time while sharing the same physical infrastructure, thereby reducing overall power consumption compared to having all drivers active at once.
3Measurement precision
If individual driver circuits are used for each LED, then precise control is achieved, but the number of components and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple separately-controlled LED strings into a single series-connected LED string controlled by one driver circuit. This merging reduces the number of components that need to be assembled and wired, simplifying manufacturing and assembly processes while maintaining the ability to precisely control which LEDs are activated through the single driver's selective switching capability.
Data Source
AI summary
The present disclosure includes methods and systems for creating, using, and controlling LED headlight topologies and matrices that require fewer parts, electricity, and power, while allowing for advanced features such as bend lighting. The disclosed methods and systems can enable the use of smaller electrical systems, including control systems for LED and other headlight topologies. The disclosed methods and systems can also take advantage of pixel pairing and time multiplexing, among other methods, to manage electrical flow to minimize power needed over the circuit at given times, thus reducing the amount of material needed to create the LED headlight topology and related methods and systems for creating, using, and controlling the LED headlight topology.