High Voltage Constant Current Driver Chip for LED Arrays
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Solution Overview
Problem
The existing flashing LED lamp strings require current limiting elements and additional rectifier circuits when connected to an AC power supply, increasing costs and reducing design flexibility due to the limited number of flashing lamps.
Innovation Solution
A light emitting semiconductor integrated circuit that includes a high voltage constant current driver chip connected in series with a light emitting semiconductor lamp body, allowing the chip to convert AC power to a DC constant current source, eliminating the need for current limiting elements and rectifier circuits, and enabling arbitrary adjustment of the number of flashing lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current limiting elements and rectifier circuits are added to connect flashing LED lamps to AC power supply, then the LED lamp string can be powered by AC, but the cost increases and the appearance is affected
Solution Approach 1:
The patent integrates the rectifier circuit and constant current driver functions into a single integrated driver chip. This chip simultaneously performs AC-to-DC rectification and constant current regulation, eliminating the need for separate current limiting elements and rectifier circuits. The integration reduces component count, simplifies the circuit structure, and maintains AC power supply compatibility while avoiding the appearance and cost issues of discrete components.
Solution Approach 2:
The integrated driver chip serves multiple functions: it acts as a rectifier circuit to convert AC to DC, functions as a constant current driver to regulate LED current, and provides over-voltage and over-current protection. This multi-functional design eliminates the need for separate dedicated components for each function, thereby reducing overall circuit complexity while maintaining full AC power supply adaptability.
2Reliability
If non-flashing LED lamps are added to increase reverse blocking voltage in flashing LED lamp strings, then the reverse voltage is sufficient, but the number of flashing lamps is limited and design flexibility is reduced
Solution Approach 1:
The integrated driver chip incorporates an internal high-voltage withstand capability with a reverse breakdown voltage greater than 200V. This parameter change in the driver chip's voltage tolerance allows the circuit to handle high reverse voltages without requiring additional non-flashing LED lamps for voltage blocking. Consequently, all LED lamps in the string can be flashing lamps, and the ratio of flashing to non-flashing lamps can be freely adjusted, greatly enhancing design flexibility.
3Reliability
If the ratio of flashing lamps to non-flashing LED lamps is fixed at 1:4 or 1:5, then the reverse blocking voltage is sufficient, but the flexibility of lamp string design is greatly affected
Solution Approach 1:
The integrated driver chip is designed with a high reverse breakdown voltage threshold (>200V) that inherently provides sufficient reverse voltage blocking capability. This parameter enhancement eliminates the need for fixed lamp ratio configurations (such as 1:4 or 1:5) that were previously necessary to achieve adequate reverse voltage protection. Users can now freely design lamp strings with any desired ratio of flashing to non-flashing lamps, or use exclusively flashing lamps, without compromising electrical 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 allows for flexible design and arbitrary adjustment of the number of flashing lamps, reduces manufacturing costs by eliminating unnecessary circuits, and ensures uniform brightness across varying input voltages.
Implementation Method 1
a high voltage constant current driver chip configured to connect to an external AC power supply and to convert the external AC power supply into a DC constant current source
Implementation Method 2
a light emitting semiconductor lamp body having a plurality of non-flashing LED lamps and/or flashing LED lamps connected in series
Data Source
AI summary
Disclosed are a light emitting semiconductor integrated circuit including a light emitting semiconductor lamp body and a high voltage constant current driver chip. The lamp body has a plurality of non-flashing LED lamps and/or flashing LED lamps connected in series. An input voltage of the high voltage constant current driver chip has a preset input voltage range, a first reverse breakdown voltage of the high voltage constant current driver chip has a preset breakdown voltage range, a first output current of the high voltage constant current driver chip has a preset output current range, and a first threshold voltage of the high voltage constant current driver chip has a preset threshold voltage range.