LED Driver Auxiliary Winding Segmentation for Vcc Stability
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Solution Overview
Problem
Conventional LED drivers face challenges in maintaining consistent Vcc voltage across different load states, leading to increased losses and potential failure to meet DC power requirements for control devices, especially due to the consistent dotted terminals of auxiliary and secondary windings which result in varying output voltages.
Innovation Solution
The LED driver incorporates two auxiliary windings connected in series with their dotted terminals consistent with either the primary or secondary side winding, along with rectifying devices and a voltage regulator, allowing for selective power supply by either winding or both under different voltage conditions to ensure consistent Vcc voltage and reduce losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single auxiliary winding with consistent dotted terminal is used, then the circuit structure is simple and cost is low, but the Vcc voltage cannot meet DC power supplying requirements under light load state
Solution Approach 1:
The auxiliary winding is divided into two separate windings (first auxiliary winding and second auxiliary winding) with different turns ratios. This segmentation allows each winding to be optimized for different load conditions, resolving the contradiction between structural simplicity and voltage stability reliability.
Solution Approach 2:
The circuit dynamically switches between using only the first auxiliary winding, only the second auxiliary winding, or both windings together based on load conditions. This dynamic adaptation ensures Vcc voltage meets requirements under both heavy and light load states while maintaining reasonable structural complexity.
2Reliability
If the auxiliary winding is configured to ensure Vcc voltage meets requirements under light load, then voltage stability is improved, but losses increase under heavy load state
Solution Approach 1:
The circuit dynamically selects which auxiliary winding(s) to use based on load conditions. Under heavy load, only the first auxiliary winding is used to minimize losses. Under light load, the second auxiliary winding or both windings are used to ensure voltage sufficiency, thus dynamically optimizing the trade-off between reliability and energy loss.
Solution Approach 2:
The circuit changes the effective turns ratio parameter by selecting different auxiliary windings or combinations based on load conditions. This parameter change allows optimization of the Vcc voltage output to match the actual power requirements, reducing energy losses when full voltage is not needed.
3Device complexity
If a single auxiliary winding is used, then the device complexity is low, but the adaptability to different load states is insufficient
Solution Approach 1:
The auxiliary power supply is segmented into two windings with different characteristics, enabling the system to adapt to different load states. This segmentation provides the necessary adaptability while keeping each individual winding relatively simple in structure.
Solution Approach 2:
The dual auxiliary winding configuration provides multi-functionality, where the system can operate in multiple modes (first winding only, second winding only, or both windings together) to adapt to various load conditions, enhancing versatility without excessive complexity.
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
This configuration ensures that Vcc voltage consistently meets the DC power requirements of control devices across heavy and light load states while minimizing losses by selectively engaging the auxiliary windings based on input or output voltage conditions.
Implementation Method 1
an auxiliary winding W13 which provides required DC electricity for respective control devices in the LED driver 1 after rectification of a diode D11
Implementation Method 2
after rectification of a diode D11
Data Source
AI summary
The present application discloses a LED driver including: a first and a second auxiliary windings connected in series with each other; a first rectifying device coupled with a terminal of the first auxiliary winding while the other terminal is coupled with the second auxiliary winding; a second rectifying device coupled with a terminal of the second auxiliary winding; a first voltage regulator coupled with the first rectifying device; an unidirectional conducting device having a positive and a negative terminals; and a DC output terminal coupled with the negative terminal of the unidirectional conducting device and configured to provide required DC electricity to a control circuit in the LED driver. The LED driver can guarantee that Vcc voltages provided under a heavy or light load state can always meet the DC power supplying requirements of respective control devices in the driver and meanwhile losses can be reduced.