Single-Channel SMPS for Vehicle Lighting
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Solution Overview
Problem
Dual mode vehicle lighting systems require a dual channel driver, increasing electrical component count, system complexity, and leading to electromagnetic compatibility issues due to asynchronous operation of low and high intensity channels.
Innovation Solution
A single channel switch mode power supply (SMPS) with a mode switch controller and electronic switch, allowing the system to short circuit or remove the short circuit across secondary LEDs based on input signals, eliminating the need for a dual channel driver and ensuring synchronized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual channel driver is used to control low intensity and high intensity functions, then the lighting system can provide both lighting modes, but the electrical component count and system complexity increase
Solution Approach 1:
The patent combines two independent driver channels into a single integrated driver circuit. The single channel driver uses a mode switch controlled by a control signal to selectively connect either the low intensity LEDs or high intensity LEDs to the power supply, eliminating the need for separate dual channel driver circuits while maintaining both lighting functions.
Solution Approach 2:
The single channel driver is designed to perform multiple functions by switching between different operating modes. The same driver circuit can drive both low intensity LEDs and high intensity LEDs by changing the switch state, making the driver universal rather than requiring dedicated circuits for each intensity level.
2Adaptability or versatility
If a dual channel driver is used to control low intensity and high intensity functions, then both lighting modes can be controlled independently, but the number of electrical components increases
Solution Approach 1:
The patent merges two separate driver channels into one unified driver circuit with a mode switch. Instead of having two independent driver circuits each with their own components, a single driver circuit controls both low and high intensity outputs through switching, significantly reducing the total component count.
Solution Approach 2:
The patent extracts the intensity control function from separate driver channels and consolidates it into a single driver with a mode switch. The switching mechanism selectively extracts and connects only the required LED set (low or high intensity) to the power supply, eliminating redundant components.
3Adaptability or versatility
If both channels operate at different frequencies, then each channel can be optimized for its specific LED requirements, but electromagnetic compatibility issues arise due to asynchronous operation
Solution Approach 1:
The patent merges the operating frequencies of both channels by using a single unified switching frequency for the mode switch. This ensures that both low and high intensity LED sets operate synchronously at the same frequency, eliminating electromagnetic interference caused by asynchronous operation while still allowing optimization through duty cycle control.
Solution Approach 2:
The control circuit monitors the operating conditions and adjusts the mode switch timing to maintain synchronous operation. By using feedback control, the system ensures that switching occurs at optimal moments for both LED sets, maintaining electromagnetic compatibility while adapting to different operational requirements.
Data Source
AI summary
A vehicle lighting system includes a first LED, a second LED, a mode switch controller, and an electronic switch. The first LED is electrically connected in series with the second LED. The mode switch controller is electrically connected to each of the first and second LEDs. The electronic switch is electrically connected to the mode switch controller between the first and second LEDs. The electronic switch is configured to short circuit the second LED in a primary mode, and to remove the short circuit in a secondary mode. The mode switch controller is configured to control the electronic switch to short circuit the second LED in the first mode, receive an input indicative of the secondary mode from a vehicle controller, and in response, control the electronic switch to remove the short circuit.