Supply Circuit with Feedback Control for LED Stability
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Solution Overview
Problem
Prior art supply circuits experience fluctuations in output signals due to input signal or voltage drop variations, leading to inconsistent brightness in light emitting diodes.
Innovation Solution
A supply circuit comprising a first circuit for converting input signals into pulse signals, a second circuit with a resonance circuit for supplying the output signal, and a third circuit with a generator to control the transistors, reducing dependency between input and output signals by introducing a control loop that adjusts the output signal independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a prior art supply circuit is used with a half bridge configuration and impedance circuit, then the circuit structure is relatively simple, but the output signal fluctuates due to input signal and voltage drop variations
Solution Approach 1:
The patent implements a feedback mechanism where the output signal is monitored and fed back to the control circuit. The control circuit adjusts the pulse signal based on the feedback from the output, creating a closed-loop system that compensates for fluctuations in input signal and voltage drops, thereby stabilizing the output signal while managing circuit complexity.
Solution Approach 2:
The patent dynamically changes operating parameters (such as pulse width, frequency, or duty cycle) based on detected output conditions. By adjusting these parameters in real-time through the control circuit, the system maintains stable output performance despite variations in input conditions, resolving the contradiction between reliability and complexity.
2Illumination intensity
If the output signal is directly supplied without active control, then the device complexity is low, but the brightness of light emitting diodes fluctuates
Solution Approach 1:
The control circuit receives feedback information about the output signal and LED operating conditions, then adjusts the pulse signal parameters accordingly. This feedback loop ensures consistent LED brightness by compensating for variations in input voltage and LED forward voltage drops, achieving stable illumination intensity while justifying the added control circuit complexity.
Solution Approach 2:
The control circuit automatically adjusts operating parameters based on real-time conditions without external intervention. The system self-regulates the pulse signal to maintain optimal LED brightness, eliminating the need for manual adjustment and providing stable illumination while managing the complexity through automated control.
3Reliability
If a control loop is introduced to reduce dependency between input and output signals, then the output signal stability is improved, but the device complexity increases
Solution Approach 1:
The control loop implements feedback by monitoring the output signal and adjusting the input pulse signal accordingly. This closed-loop control reduces the dependency between input signal variations and output signal fluctuations, achieving constant output while the added complexity is managed through efficient feedback implementation.
Solution Approach 2:
The control loop dynamically changes pulse signal parameters (width, frequency, duty cycle) based on output conditions to decouple the relationship between input and output signals. This parameter adjustment strategy achieves output constancy while managing control loop complexity through targeted parameter optimization.
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 provides a relatively constant output signal to the load, reducing fluctuations in output voltage and current, and allows for adjustable output signals by adjusting reference signals, resulting in improved stability and control over the lighting system.
Implementation Method 1
a second circuit for receiving the pulse signal and for supplying the output signal to the load, which second circuit comprises a resonance circuit
Data Source
AI summary
Supply circuits (1-3,101-102,201-203) for supplying output current signals to loads (6,106,206) and comprising first circuits (1,101,201) with transistors (11-14,111-112,211-212) for converting input voltage signals into pulse signals and comprising second circuits (2,102,202) with resonance circuits for receiving the pulse signals and for supplying the output current signals to the loads (6,106,206) are provided with third circuits (3,203) for controlling the first circuits (1,101,201), which third circuits (3,203) comprise generators (35-37) for generating control signals for controlling the transistors (11-14,111-112,211-212) for reducing dependencies between the input voltage signals and the output current signals. The third circuits (3,203) supply the control signals in dependence of the input voltage signals and independently from the output current signals. The transistors (11-14,111-112,211-212) may form a full bridge, a full bridge operated in a half bridge mode, or a half bridge.