Tubular LED Ballast Buck-Boost Converter Dynamic Mode Switching
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Solution Overview
Problem
Conventional LED ballasts struggle with efficiently adapting to varying input voltages, leading to suboptimal performance and efficiency across different voltage ranges, as they are typically limited to static converter modes that do not dynamically adjust to changing input conditions.
Innovation Solution
A tubular LED ballast incorporating a buck-boost converter circuit with a switchable topology that dynamically switches between buck, boost, and buck-boost modes based on input voltage, utilizing transistors and freewheeling diodes to optimize energy transfer and maintain efficiency across a wide range of input voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static converter mode is used in conventional LED ballasts, then the device complexity is reduced, but the efficiency and performance adaptability to varying input voltages deteriorates
Solution Approach 1:
The patent implements a dynamic switching mechanism that automatically selects between buck and boost converter modes based on the relationship between input voltage (V_IN) and output voltage (V_OUT). When V_IN > V_OUT, the circuit operates in buck mode; when V_IN < V_OUT, it operates in boost mode. This dynamic adaptation allows the ballast to efficiently handle varying input voltages without requiring manual configuration or complex control systems.
Solution Approach 2:
The circuit design integrates both buck and boost converter capabilities into a single universal ballast circuit that can perform both voltage stepping-down and voltage stepping-up operations. By incorporating switchable topology with complementary switching elements (Q1, Q2) and diodes (D1, D2), the circuit achieves multi-functionality, eliminating the need for separate auxiliary power supplies and reducing overall system complexity despite the enhanced adaptability.
2Use of energy by moving object
If a single converter mode is used, then the device complexity is reduced, but the energy efficiency across different voltage ranges deteriorates
Solution Approach 1:
The patent utilizes parameter changes in the switching elements to optimize energy efficiency across different voltage conditions. The switching elements (Q1, Q2, D1, D2) are controlled to change their conduction states based on the input voltage level, enabling the circuit to operate in the most efficient mode for each condition. This parameter-based switching minimizes energy losses associated with inappropriate converter mode selection.
Solution Approach 2:
The dynamic mode switching between buck and boost configurations allows the circuit to maintain optimal energy efficiency regardless of whether the input voltage is higher or lower than the output voltage. The automatic selection of converter mode ensures that energy conversion occurs through the most efficient pathway available, reducing wasteful energy dissipation and improving overall system efficiency.
3Reliability
If separate auxiliary power supplies are used, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent achieves the reliability benefits of multiple power supply configurations through a single universal ballast circuit that can operate in both buck and boost modes. The switchable topology with complementary switching elements provides the functional equivalence of separate auxiliary power supplies while reducing the actual number of components required. This eliminates the need for multiple separate power supply units, reducing device complexity and potential failure points while maintaining system reliability.
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 solution enables the tubular LED ballast to achieve improved efficiency by dynamically selecting the ideal converter mode, enhancing power factor and reducing the need for separate auxiliary power supplies, with expected efficiency improvements of 3%-5% over static converters.
Implementation Method 1
an inductor including a first end and a second end
Implementation Method 2
a capacitor including a first end and a second end
Implementation Method 3
a first diode including a cathode end and an anode end, a second diode including a cathode end and an anode end
Data Source
AI summary
A buck-boost converter may include a first switch, an inductor, a first diode, a second switch, a second diode, and a capacitor. A cathode end of the first diode may be coupled to a first end of the inductor and a second end of the first switch. An anode end of the second diode may be coupled to a second end of the inductor and a first end of the second switch. A second end of the capacitor may be coupled to a second end of the second switch and an anode end of the first diode. A first end of the capacitor may be coupled to a cathode end of the second diode.