Three-Phase LED Tunnel Lamp Driver IC for Low-Strobe Power Control
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Solution Overview
Problem
Existing LED driving circuits for tunnel lamps using three-phase alternating-current mains power supply face issues such as complex wiring, high power consumption, harmonic distortion, and optical strobe, with a lack of dimming functionality and poor reliability, particularly due to inadequate connection and arrangement of chip pins.
Innovation Solution
An integrated circuit and driving application circuit design that separates chip power supply, load current sampling, and load switch control ports, allowing flexible adjustment of resistors to optimize power consumption and harmonic distortion, while improving current sampling accuracy and switching control, and enabling convenient and standardized SMD assembly and dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If switching power source is used to drive LED, then power factor and conversion efficiency are improved, but circuit complexity and reliability deteriorate
Solution Approach 1:
The patent extracts the high-voltage switching circuit from the LED driving system and replaces it with a direct AC drive approach. The integrated circuit directly controls LED strings connected to three-phase AC power supply without requiring high-voltage switching components, thereby eliminating the complex switching circuit while maintaining high power factor through the inherent properties of AC direct drive.
Solution Approach 2:
The patent introduces an intermediary integrated circuit that acts as a mediator between the three-phase AC power supply and the LED loads. This intermediary circuit provides current sampling, pulse generation, and control functions without requiring complex high-voltage switching, thus achieving high power factor operation with simplified circuitry.
2Use of energy by moving object
If switching power source is used to drive LED, then power conversion efficiency is improved, but reliability and service life deteriorate
Solution Approach 1:
The patent removes the high-voltage switching components and electrolytic capacitors from the circuit, which are the primary sources of failure. The direct AC drive approach maintains high conversion efficiency by eliminating switching losses while dramatically improving reliability through the use of solid-state components only.
Solution Approach 2:
The patent replaces expensive, fragile high-voltage switching components with inexpensive, highly reliable solid-state integrated circuits and resistors. The simplified circuit uses only robust components that have long service lives and high reliability, eliminating the need for maintenance-prone switching elements.
3Device complexity
If alternating-current direct-drive LED technology is used, then circuit simplicity and reliability are improved, but optical strobe occurs
Solution Approach 1:
The patent employs periodic pulse generation based on the three-phase AC power supply frequency. The integrated circuit generates control pulses synchronized with the AC cycles, and by strategically controlling LED switching across multiple phases, it achieves continuous illumination effect that eliminates optical strobe while maintaining circuit simplicity.
Solution Approach 2:
The patent ensures continuous useful action by overlapping the conduction periods of multiple LED strings connected to different phases. The control circuit generates pulses that keep at least one LED string conducting at any given moment, thereby eliminating strobe effects while maintaining the simplicity of direct AC drive.
4Power
If existing LED driving circuits are used, then basic LED illumination is achieved, but dimming functionality and adaptability are insufficient
Solution Approach 1:
The patent implements dynamic control capability through the integrated circuit that can adjust pulse width and frequency based on control signals. The system accepts external control inputs to dynamically adjust LED brightness, enabling dimming functionality while maintaining the ability to adapt to different operating conditions and control requirements.
Data Source
AI summary
The invention relates to an integrated circuit and a driving application circuit for a LED tunnel lamp using a three-phase alternating-current mains power supply. The integrated circuit includes a voltage stabilizing circuit (1), an under-voltage protection circuit (2), a comparison amplification circuit (3), and a low-voltage control circuit (4). The invention has the characteristics of high LED driving power source efficiency, high power factor (PF), small harmonic distortion, high reliability, good optical strobe resistance, low cost, etc. In addition, as a result of the three-phase alternating-current mains power supply, an input voltage is high, and for tunnel lamps with the same power, the current flowing through a wire cable of an illumination system is particularly small, such that the cost of the wire cable can be greatly reduced, the power source conversion efficiency is greater than 95%, the PF is greater than 0.92, the harmonic distortion is less than 20%, the optical strobe depth is less than 20%, and the luminous efficacy is increased by more than 20%.