ADB Lamp Power Supply Feedback for Voltage Stability
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Solution Overview
Problem
Adaptive Driving Beam (ADB) lamps face issues with power supply voltage regulation, leading to unnecessary power consumption, flickering, and high costs due to large current requirements, as well as the lack of disconnection detection in the power supply circuit.
Innovation Solution
A lamp system with a variable light distribution light source featuring a power supply circuit that includes a DC/DC converter, a voltage setting circuit, and a converter controller, which uses a sense terminal and feedback circuit to adjust the output voltage and detect electrical states, reducing power consumption and enabling disconnection detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power supply circuit without disconnection detection is used, then the device complexity is reduced, but the reliability deteriorates due to inability to detect electrical abnormalities
Solution Approach 1:
The patent implements a feedback mechanism where the converter controller continuously monitors the power supply cable connection status and adjusts its operation accordingly. When disconnection is detected, the controller receives feedback and changes the operating state, ensuring reliable detection of electrical abnormalities without requiring complex additional detection circuits.
2Use of energy by moving object
If the power supply voltage is not regulated, then the device complexity is reduced, but the use of energy increases due to unnecessary power consumption
Solution Approach 1:
The voltage setting circuit provides feedback control to the converter controller, enabling dynamic regulation of power supply voltage based on actual load requirements. This feedback mechanism allows the system to optimize power consumption by adjusting voltage levels according to operational needs, rather than maintaining constant high voltage.
Solution Approach 2:
The power supply circuit transitions from a static voltage supply to a dynamic regulated supply where the converter controller actively adjusts output voltage based on load conditions. This dynamic adaptation reduces unnecessary power consumption while maintaining adequate voltage levels for LED operation.
3Ease of manufacture
If a simple power supply circuit without disconnection detection is used, then the ease of manufacture is improved, but the reliability deteriorates
Solution Approach 1:
The converter controller integrates disconnection detection functionality into its existing feedback control mechanism. By monitoring voltage and current parameters through its feedback circuitry, the controller can detect cable disconnections without requiring separate detection hardware, maintaining ease of manufacture while improving reliability.
4Use of energy by moving object
If voltage regulation components are added to reduce power consumption, then the use of energy is improved, but the device complexity increases
Solution Approach 1:
The converter controller performs multiple functions including voltage regulation, current control, and disconnection detection through a single integrated circuit. This multi-functionality allows the system to achieve power consumption optimization without proportionally increasing device complexity, as the same controller hardware handles multiple tasks.
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 stabilizes power supply voltage, reduces power consumption, and detects electrical abnormalities, thereby improving the reliability and efficiency of the ADB lamp system while reducing costs.
Implementation Method 1
a DC/DC converter 224
Implementation Method 2
a feedback circuit 226 configured to generate a feedback voltage VFB based on the correction voltage VCMP and a control target voltage VCNT
Data Source
AI summary
A variable light distribution light source includes an array-type light-emitting device. The array-type light-emitting device includes a power supply terminal and multiple pixel circuits electrically coupled and spatially arranged in a matrix. A power supply circuit includes a power supply unit that supplies electric power to the array-type light-emitting device. An output of a DC/DC converter is coupled to the power supply terminal VDD of the array-type light-emitting device via an output terminal. A voltage setting circuit generates a controllable correction voltage. A feedback circuit generates a feedback voltage based on the correction voltage and the control target voltage that corresponds to the output voltage of the DC/DC converter, and supplies the feedback voltage to a feedback pin of a converter controller.