Vehicle Lamp Switching Converter Layout for Noise Shielding
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Solution Overview
Problem
Switching converters with high power consumption generate significant noise, and when placed on a substrate, they complicate noise reduction and increase the substrate size due to the need for longer wiring patterns.
Innovation Solution
A lighting control apparatus with a conductive cover shielding noise and a substrate design that includes a first switching converter between conduction parts, along with connectors oriented to intersect the input region, improving wiring efficiency and reducing substrate size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a switching converter with large power consumption is provided on a substrate, then drive capability is improved, but noise generation increases and noise reduction becomes difficult
Solution Approach 1:
The substrate is divided into a noise source region (housing the switching converter) and a noise affected region (housing sensitive circuits), with a noise reduction region positioned between them. This spatial segmentation isolates the noise-generating components from noise-sensitive components, allowing high power switching converters to be used without compromising overall system noise performance.
Solution Approach 2:
A ground potential region acts as an intermediary between the noise source region and the noise affected region. This ground region serves as a noise barrier, providing a low-impedance path for noise currents and preventing noise propagation from the switching converter to sensitive circuits, thereby enabling high-power operation with controlled noise.
2Ease of operation
If the longitudinal direction of the connector is provided in parallel to the input region, then connection is simplified, but wiring pattern length increases and substrate size increases
Solution Approach 1:
The connector is designed with an asymmetric orientation where its longitudinal direction intersects the input region at an angle (optimally perpendicular) rather than running parallel. This asymmetric arrangement, combined with providing connection terminals on both outer sides of the connector, creates an efficient wiring layout that minimizes total wiring length while maintaining connection simplicity.
Solution Approach 2:
Connection terminals are provided on both outer sides of the connector in the transverse direction, utilizing the two-dimensional substrate space more efficiently. This dimensional approach allows wiring to connect to terminals on either side of the connector, reducing the need for long wiring patterns that would extend in one direction only, thereby minimizing substrate area while maintaining ease of connection.
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 reduces noise and minimizes substrate size by using a conductive cover and optimized connector placement, enhancing overall apparatus performance.
Implementation Method 1
a first cover which is formed of a conductive material and covers at least a part of components of the first switching converter
Implementation Method 2
a first switching converter which includes a switching element, a coil, and a first output capacitor and is configured to generate a first drive voltage corresponding to a first light source of the vehicle lamp based on a power source voltage
Data Source
AI summary
A lighting control apparatus is configured to be applied to a vehicle lamp. The lighting control apparatus includes a first switching converter, a substrate on which the first switching converter is provided, and a first cover. The first switching converter includes a switching element, a coil, and a first output capacitor and is configured to generate a first drive voltage corresponding to a first light source of the vehicle lamp based on a power source voltage. The first cover is formed of a conductive material and covers at least a part of components of the first switching converter in one surface of the substrate. The substrate includes a first conduction part and a second conduction part which are in conductive contact with the first cover. The first switching converter is provided between the first conduction part and the second conduction part. The first output capacitor is provided in a vicinity of one part of the first conduction part and the second conduction part.