LED Driver Control Circuit for Battery Voltage Flickering
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Solution Overview
Problem
Conventional lighting apparatuses using direct-current power supplies from storage batteries often cause flickering of LED illumination loads due to variations in input voltage, leading to unstable light output.
Innovation Solution
A lighting apparatus with a power supply circuit and current measuring device, controlled by a circuit that adjusts output current to match a target value through multiple control modes, including one that stabilizes the target value regardless of input voltage fluctuations, thereby reducing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant current control is applied when battery voltage is within normal range, then LED unit operates normally, but output current varies in short cycle when battery voltage varies, causing flickering
Solution Approach 1:
The control circuit continuously monitors the output current and adjusts the power supply circuit accordingly to maintain the target current value. This feedback mechanism compensates for battery voltage variations, preventing output current fluctuations and LED flickering while maintaining reliable operation.
Solution Approach 2:
The control circuit dynamically adjusts the target output current value based on real-time battery voltage conditions. By making the target value adaptive rather than fixed, the system maintains stable LED operation across varying battery voltage conditions without causing flickering.
2Reliability
If output current is reduced when battery voltage falls below normal range, then LED unit is protected, but light intensity decreases
Solution Approach 1:
The control circuit changes the target current parameter based on battery voltage conditions. When battery voltage is sufficient, the target current is set to maintain normal light intensity. When battery voltage drops below the normal range, the target current is reduced to protect the LED while minimizing light intensity loss.
3Adaptability or versatility
If multiple control modes are implemented to handle different battery voltage conditions, then system adaptability improves, but control circuit complexity increases
Solution Approach 1:
The control circuit implements multiple control modes by changing operational parameters rather than adding complex hardware. The same control circuit structure can switch between different control strategies (normal mode, low-voltage mode, etc.) by adjusting target current values and control algorithms, achieving high adaptability with minimal complexity increase.
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 stabilizes the output current and light intensity, reducing flickering and ensuring consistent illumination even with varying input voltage, thus protecting the battery and maintaining reliable lighting.
Implementation Method 1
a power supply circuit configured to perform voltage conversion of a first direct-current voltage into a second direct-current voltage to apply the second direct-current voltage to an illumination load
Data Source
AI summary
A lighting apparatus includes a control circuit configured to control a power supply circuit such that a measurement value of an output current measured by a current measuring device approaches a target value. The control circuit is configured to execute a control mode alternatively selected from the plurality of control modes to control the power supply circuit. The plurality of control modes of the control circuit includes at least a first control mode and a second control mode. The first control mode is a control mode of adjusting the target value in accordance with a first direct-current voltage. The second control mode is a control mode which includes adjusting the target value regardless of the first direct-current voltage.