H-Bridge Two-Line LED Dimming Circuit for Polarity-Free Color Control
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Solution Overview
Problem
Existing LED driving power supplies face high manufacturing costs and complexity due to complex circuits, especially in dual-color light control, which hinders product miniaturization and requires complex wiring.
Innovation Solution
An H-bridge dimming and color temperature adjusting two-line output circuit using MOS transistors and signal generators with complementary duty cycles, allowing for simple circuit connection and two-line dimming without distinguishing between positive and negative electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex circuits are adopted to provide better dimming experience, then dimming performance is improved, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The H-bridge circuit structure enables the power supply to simultaneously achieve dimming control and color temperature adjustment through a single circuit architecture. By using four switch transistors (Q1-Q4) arranged in an H-bridge configuration, the circuit can control both cold and warm light groups through two signal lines, eliminating the need for separate control circuits for different lighting functions.
Solution Approach 2:
The patent combines multiple control functions (dimming and color temperature adjustment) into a single integrated power supply circuit. The H-bridge structure merges the control of cold light group and warm light group into one unified circuit, reducing the overall system complexity while maintaining full functionality.
2Adaptability or versatility
If complex circuits are adopted for dual-color light control, then color temperature adjustment capability is improved, but device volume increases
Solution Approach 1:
The H-bridge circuit serves multiple functions simultaneously: it controls dimming levels and adjusts color temperature by selectively activating different switch transistors. The same four transistors (Q1-Q4) and two signal lines handle both cold and warm light group control, eliminating the need for additional dedicated circuits for color temperature adjustment.
Solution Approach 2:
The patent uses complementary duty cycle PWM signals on two signal lines to control four switch transistors in an H-bridge configuration. This dimensional approach allows control of multiple lighting parameters (brightness and color temperature) through a reduced number of control lines by utilizing the temporal dimension of complementary PWM waveforms.
3Manufacturing precision
If complex wiring requirements are imposed, then control precision is improved, but ease of installation deteriorates
Solution Approach 1:
The H-bridge circuit achieves precise control of both dimming and color temperature through a single two-line interface. The complementary PWM signals on these two lines simultaneously control the four switch transistors, enabling precise control of cold and warm light groups without requiring separate dedicated wiring for each control function.
Solution Approach 2:
The patent merges multiple control signals into two complementary PWM signal lines that control the entire H-bridge circuit. This consolidation reduces the number of required wiring connections while maintaining precise control capability through the coordinated switching of Q1-Q4 transistors based on the complementary signal phases.
Data Source
AI summary
The present invention discloses an H-bridge dimming and color temperature adjusting two-line output circuit and an LED dimming power supply. The H-bridge dimming and color temperature adjusting two-line output circuit includes a first signal generator U1, a second signal generator U2, a first switch transistor Q1, a second switch transistor Q2, a third switch transistor Q3, and a fourth switch transistor Q4. Through the above structure, it is possible to achieve two-line dimming and color temperature adjustment without distinguishing between positive and negative electrodes. The H-bridge dimming and color temperature adjusting two-line output circuit has the advantages of simple circuit connection, fewer devices, low cost, stable performance, and smooth dimming.