Integrated Lamp Module Circuit for Seamless High-Low Beam Switching
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Solution Overview
Problem
Existing vehicular lamp systems have large size and cost due to independent high-beam and low-beam function circuits, which complicates assembly and may result in both functions being unlit during switching, affecting safety.
Innovation Solution
A lamp module with a drive circuit providing constant-current output for both light sources, including a first light source with M LEDs and a second light source with N LEDs, connected in series and parallel configurations, and a switching circuit that controls the flow of current between the light sources based on a switching signal to enable seamless switching between functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent circuits are used for high-beam and low-beam functions, then each function can operate independently, but the cost and size of the vehicular lamp increase
Solution Approach 1:
The patent combines the high-beam and low-beam circuits into a single integrated circuit structure. The switching element selectively connects the light emitting elements to different circuit nodes (first node for high-beam, second node for low-beam) based on the input signal, eliminating the need for separate independent circuits while maintaining functional independence of both beam modes.
2Device complexity
If a single drive circuit is used for both light sources, then cost and size are reduced, but switching between functions may cause both functions to be unlit temporarily
Solution Approach 1:
The switching element is designed to pre-establish the correct circuit connection before transitioning between high-beam and low-beam modes. When switching occurs, the circuit configuration ensures that light emitting elements remain continuously connected to either the first node or second node through the switching element, preventing any temporary state where both functions would be unlit.
3Device complexity
If light emitting elements are connected in series, then current control is simplified, but the circuit may be interrupted during switching
Solution Approach 1:
The switching element acts as an intermediary component that maintains continuous current flow through the light emitting elements during switching operations. By strategically placing the switching element at specific circuit nodes and controlling its on/off states based on input signals, the patent ensures that series-connected light emitting elements remain continuously energized without circuit interruption during transitions between high-beam and low-beam modes.
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
This configuration reduces the size and cost of the lamp module, ensures both light sources remain illuminated during switching, and maintains low-beam luminance during high-beam operation, enhancing safety and thermal management.
Implementation Method 1
Each of the light sources 12H and 12L includes a plurality of light emitting elements (for example, LEDs)
Implementation Method 2
a first light source including M light emitting elements and a first switch that are connected in series to an output of the drive circuit
Data Source
AI summary
A lamp module includes a drive circuit; a first light source; a second light source; and a switching circuit configured to receive a switching signal for indicating switching between a first function and a second function, and to control a first switch and a second switch such that the first switch is in an on state and the second switch is in an off state while the first function is indicated, the first switch is in an off state and the second switch is in an on state while the second function is indicated, and both the first switch and the second switch are in the on states at a time of switching between the first function and the second function.