LED Converter IC Switching Between Resonant Flyback and LLC
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Solution Overview
Problem
Existing LED converters are tailored for specific applications, resulting in different DC/DC stages and circuit topologies, which limits their adaptability and efficiency across varying requirements and load ranges.
Innovation Solution
An integrated circuit that selectively controls an isolating resonant LED converter as either a resonant hybrid Flyback converter or an LLC converter based on external signal values, utilizing an active full wave bridge rectifier and isolating transformer to adjust switch configurations and achieve multiple circuit topologies within a single converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED converters are tailored for specific applications with different DC/DC stages and circuit topologies, then each converter can be optimized for its specific requirements, but the adaptability and efficiency across varying requirements and load ranges is limited
Solution Approach 1:
The patent implements a universal LED converter design that can operate in multiple circuit topologies (Flyback and LLC modes) using the same physical components. The converter achieves this by selectively activating different switches based on operating conditions, allowing a single device to serve multiple application requirements without needing separate optimized converters for each topology.
Solution Approach 2:
The converter dynamically switches between different circuit topologies (Flyback and LLC modes) based on real-time operating conditions such as load range and output requirements. This dynamic reconfiguration is achieved through control circuitry that selectively activates different switches, enabling the system to adapt its behavior to match optimal operating modes for varying conditions.
2Productivity
If multiple circuit topologies are implemented to handle different load ranges, then efficiency across varying requirements improves, but the device complexity and additional components increase
Solution Approach 1:
The same physical switches and components are used for both Flyback and LLC mode operations. The converter achieves multiple topology functionality without adding extra components by selectively activating different switches based on the desired operating mode, thereby maintaining high efficiency across load ranges without increasing device complexity.
Solution Approach 2:
The patent merges the Flyback and LLC circuit topologies into a single unified converter design. By combining the switch sets and using a common control strategy that can activate different switch combinations, the system achieves the functional equivalence of multiple separate converters while using fewer physical components.
Data Source
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AI summary
Disclosed is an integrated circuit (1) for control of an isolating resonant LED converter (2). The LED converter (2) comprises an active full wave bridge rectifier (23) and an isolating transformer (221, 222). The active full wave bridge rectifier (23) comprises a first switch (231, Q1) and a second switch (232, Q2) in series, and a third switch (233, Q3) and a fourth switch (234, Q4) in series. The isolating transformer (221, 222), comprises a secondary winding (222), interconnecting a common terminal of the first switch (231, Q1) and the second switch (232, Q2), and a common terminal of the third switch (233, Q3) and the fourth switch (234, Q4). The integrated circuit (1) is configured to selectively control the LED converter (2) as a resonant hybrid Flyback converter or as a resonant LLC converter in response to a first value (S 1) or a second value (S2) of an external signal (S), respectively. This offers the benefits of different circuit topologies within one LED converter.