Vehicle Lamp Current Control Apparatus with Segmented Output Pins
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Solution Overview
Problem
Current control technologies for vehicle lamps face challenges in stabilizing current supply while maintaining low manufacturing costs, with existing methods either having complex circuitry, high costs, or being sensitive to electromagnetic waves and requiring large PCB areas.
Innovation Solution
A current control apparatus with multiple output pins, feedback signals, and a comparator to adjust constant current output based on signal differences, allowing for precise current control across a wide range and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC-DC switching control type is used, then brightness stability is improved, but circuit complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the current control function into multiple discrete output pins (first output pin, second output pin) with different current capabilities. This segmentation allows the system to handle different current requirements without requiring complex switching control circuitry, thus maintaining brightness stability while reducing circuit complexity.
Solution Approach 2:
The patent implements dynamic current control by providing multiple output pins that can be selectively activated based on the lamp's current requirements. The system dynamically adjusts the output current by switching between different output pins rather than using complex DC-DC switching control, thereby achieving brightness stability with simpler circuitry.
2Reliability
If linear control type is used, then brightness stability is improved, but PCB area increases due to heating requirements
Solution Approach 1:
The patent divides the current control into multiple output pins with different current capacities. This segmentation eliminates the need for large heat dissipation areas required by linear control types, as each output pin is designed for specific current levels without requiring excessive PCB real estate for thermal management.
Solution Approach 2:
The patent changes the control parameter from voltage-based linear control to current-based multi-pin control. By directly controlling current through multiple output pins with different current capabilities, the system achieves brightness stability without the heat generation and large PCB area requirements inherent in linear control types.
3Ease of manufacture
If resistance control type is used, then manufacturing cost is reduced, but current control precision deteriorates
Solution Approach 1:
The patent segments the current output into multiple discrete pins, each calibrated for specific current values. This segmentation provides constant current control capability at each pin, achieving precise current control without requiring complex resistance control circuits, thus maintaining low manufacturing cost while improving current control precision.
Solution Approach 2:
The patent incorporates feedback mechanisms through output signal feedback parts connected to each output pin. This feedback enables precise constant current control by monitoring and adjusting the output current, achieving manufacturing precision comparable to more expensive control methods while maintaining the simplicity and low cost of resistance control type architecture.
Data Source
AI summary
A current control apparatus for controlling current of a lamp in a vehicle includes: a plurality of output pins to output currents of different values; an output signal feedback part connected to each of the plurality of output pins, and to generate one of a plurality of output feedback signals; a reference signal generation part to generate one of a plurality of reference signals; a signal selection part configured to select one of the plurality of output feedback signals, and to select one of the plurality of reference signals; a comparator to compare the received output feedback signal to the received reference signal, and to output a signal difference between the receive output feedback signal and the received reference signal; and a constant current driver configured to constantly adjust a current output through one of the plurality of output pins based on the signal difference.