LED Driver Voltage Deviation Detection
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Solution Overview
Problem
Existing driver devices for solid-state light applications, such as LED modules, fail to provide continuous stable power when the mains voltage is distorted, as their control loops and parameters are designed for nominal input signals and cannot adapt to variations in mains voltage wave shape and amplitude.
Innovation Solution
A driver device with a detection mechanism that measures input voltage deviations and adjusts the control loop parameters to allow deviations from predefined conditions when the input voltage exceeds a threshold, ensuring continuous power delivery by switching between primary and secondary control commands based on voltage deviation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control loop and parameters are designed for nominal input signals to ensure compliance with mains harmonics regulations, then power factor correction is achieved, but the driver cannot provide continuous stable power when mains voltage is distorted
Solution Approach 1:
The driver device dynamically switches between a first control loop (for power factor correction under normal conditions) and a second control loop (for stable power delivery under distorted conditions) based on detection of mains voltage distortion. This dynamic adaptation allows the system to maintain reliability across varying input conditions while resolving the contradiction between harmonics compliance and distortion tolerance.
Solution Approach 2:
The system changes control parameters by selecting different control loops based on the detected input voltage conditions. When distortion is detected, the system transitions from power factor correction parameters to stable power delivery parameters, enabling continuous operation despite mains voltage distortion while maintaining compliance during normal operation.
2Power
If the driver device strictly controls input current according to predefined conditions to meet harmonics regulations, then power factor is improved, but power delivery falls below required levels during partial mains dropout or flat topped mains
Solution Approach 1:
The driver device dynamically adjusts its control strategy by switching between control loops based on detected mains conditions. During partial mains dropout or flat-topped mains, the system transitions to a second control loop that prioritizes power delivery over strict harmonics compliance, ensuring sufficient power reaches the load while minimizing distortion impact.
Solution Approach 2:
The detection device continuously monitors input voltage conditions and provides feedback to the control system. Based on this feedback, the system determines when to switch from power factor correction mode to stable power delivery mode, enabling adaptive power management that responds to actual mains conditions and resolves the contradiction between power delivery and harmonics control.
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The present invention relates to a driver device (10) for driving a load (14), in particular a light unit (14) having one or more light emitters, comprising input terminals for receiving an input voltage (V10) from an external power source (12), output terminals for providing electrical power to the load for powering the load (14), a driver stage (16) connected to the input terminals and to the output terminals, wherein the driver stage (16) is adapted to control an input current (I1) drawn from the external power supply(12) and to control the electrical power provided to the output terminal shaving a predefined level, a detection device (24) for measuring at least one electrical parameter (V10, V12, I2, V20) of the driver stage (16) and for determining an input voltage deviation from predefined supply conditions on the basis of the electrical parameter (V10, V12, I2, V20), wherein the driver stage (16) is adapted to control the input current (I1) according to predefined conditions if the input voltage deviation is lower than a threshold level (63) and to allow a deviation of the input current (I1) from the predefined conditions if the input voltage deviation exceeds the threshold level (63).