Ripple Suppression Circuit for LED Power Supply Efficiency
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Solution Overview
Problem
Existing LED power supply systems face challenges with high output ripple, which are typically addressed by using large electrolytic capacitors that consume space and shorten the system's lifetime, or by employing energy-consuming ripple suppression circuits with low system efficiency.
Innovation Solution
A power supply system with a ripple suppression circuit comprising a filter circuit and a follower circuit, where the filter circuit generates a filter signal that is the sum of the average ripple signal and a positive bias signal, and the follower circuit outputs a signal that partially follows the filter signal, reducing ripple and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large capacitor with high capacitance is used at the output of the voltage converter to decrease ripple, then the ripple is suppressed, but the space consumption increases and the lifetime is shortened
Solution Approach 1:
The patent divides the ripple suppression function into two separate circuits: a filter circuit that processes the ripple signal and a follower circuit that outputs the suppressed signal. This segmentation eliminates the need for a single large capacitor, replacing it with smaller components distributed across multiple functional blocks, thereby reducing overall space consumption while maintaining effective ripple suppression.
Solution Approach 2:
The filter circuit acts as an intermediary between the voltage converter and the output, processing the ripple signal before it reaches the follower circuit. This intermediary approach allows ripple suppression to be achieved through active signal processing rather than passive energy storage, enabling the use of smaller capacitors and reducing the volume required for ripple suppression.
2Object-affected harmful factors
If a traditional ripple suppression circuit is used to suppress output ripple, then the ripple is reduced, but the energy consumption increases and system efficiency decreases
Solution Approach 1:
The follower circuit is designed to automatically follow the filter signal without requiring additional energy-consuming control circuits. The circuit uses the filtered signal itself to drive the output stage, eliminating the need for separate error amplifiers, feedback loops, and other energy-intensive components traditionally required for ripple suppression, thereby reducing overall energy consumption and improving system efficiency.
3Reliability
If a single stage PFC voltage converter is used to drive LED, then the power factor is corrected, but high output ripple is generated
Solution Approach 1:
The patent separates the power factor correction function (performed by the single-stage PFC voltage converter) from the ripple suppression function (performed by the filter circuit and follower circuit). This segmentation allows the PFC converter to focus on power factor correction while the dedicated ripple suppression circuit handles ripple reduction, enabling both functions to be optimized independently without compromising either power factor or ripple performance.
Data Source
AI summary
A ripple suppression circuit has a filter circuit and a follower circuit. The filter circuit has a first input terminal coupled to a signal source to receive a ripple signal and an output terminal to output a filter signal which is the sum of the average value of the ripple signal and a positive bias signal. The follower circuit has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is coupled to the signal source to receive the ripple signal, the second input terminal is coupled to the output terminal of the filter circuit to receive the filter signal, the follower circuit provides an output signal at the output terminal, the output signal at least partially follows the filter signal.