Vehicular Lamp Power Supply Circuit for LED Array Flicker Control
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Solution Overview
Problem
Adaptive Driving Beam (ADB) lamps with LED array devices face issues of excessive power consumption and flickering due to voltage drops across power supply cables, leading to inefficient operation and potential glare problems.
Innovation Solution
A lamp system with a power supply circuit that includes a DC/DC converter and a power supply control circuit, which dynamically adjusts the target voltage based on the light distribution pattern and voltage drops to maintain optimal operating voltage, reducing unnecessary power consumption and preventing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply voltage is increased to compensate for voltage drops in the power supply cable, then the operating reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable rather than fixed. The power supply control circuit dynamically changes the power supply voltage based on the actual operating conditions (number of illuminated pixels, cable resistance, temperature) to maintain reliable operation while minimizing power consumption. This resolves the contradiction by adapting the voltage level to actual needs rather than always using a high fixed voltage.
Solution Approach 2:
The patent changes the parameter of power supply voltage from a constant value to a variable value that is adjusted according to operating conditions. The control circuit monitors parameters such as the number of illuminated pixels, cable resistance, and temperature, then adjusts the power supply voltage accordingly. This parameter change allows the system to maintain reliability while reducing unnecessary power consumption when full voltage is not needed.
2Use of energy by moving object
If the power supply voltage is dynamically adjusted based on operating conditions, then the power consumption is reduced, but the control complexity increases
Solution Approach 1:
The patent implements feedback control where the power supply control circuit continuously monitors operating parameters (number of illuminated pixels, cable resistance, temperature) and adjusts the power supply voltage accordingly. This feedback mechanism automates the voltage adjustment process, reducing the need for complex manual control while optimizing power consumption. The feedback loop simplifies the overall control by making the system self-regulating based on actual conditions.
3Reliability
If a fixed high power supply voltage is used, then the operating reliability is improved, but the unnecessary power consumption increases
Solution Approach 1:
The patent transforms the fixed power supply voltage into a dynamic voltage that adapts to operating conditions. By using a power supply control circuit that adjusts the voltage based on the number of illuminated pixels, cable resistance, and temperature, the system maintains reliability when needed while avoiding unnecessary power consumption during normal operation. This dynamic approach eliminates the waste of using high voltage when lower voltage would suffice.
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 power consumption and maintains stable operation by dynamically adjusting the target voltage, ensuring the power supply voltage remains above the minimum operating voltage, thus preventing flickering and glare issues.
Implementation Method 1
a DC/DC converter 224 configured to output a constant voltage
Implementation Method 2
an array-type light-emitting device 212 including multiple pixel circuits PIX1 through PIXn... each pixel circuit PIXj includes a light-emitting element 213_j
Implementation Method 3
Each pixel (which will also be referred to as a 'pixel circuit') is configured including an LED 12 and an LED driver 14
Data Source
AI summary
An array-type light-emitting device includes multiple pixel circuits electrically coupled in parallel and spatially arranged in a matrix. A power supply circuit supplies electric power to the array-type light-emitting device. A DC/DC converter has an output coupled to a power supply terminal of the array-type light-emitting device via a power supply line. A power supply control circuit sets a target value that corresponds to a light distribution pattern, and controls the DC/DC converter such that the control target voltage approaches the target value.