LED Current Balancing Circuit Using Capacitive Elements
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Solution Overview
Problem
Current balancing techniques for LED assemblies, such as using independent drivers or common chokes, complicate circuitry, increase manufacturing costs, and fail to achieve uniform current distribution, leading to non-uniform luminance and reduced longevity of LEDs.
Innovation Solution
A current balancing circuit employing capacitors as current-equaling elements, connected between AC power generators and LED assemblies in parallel configurations, to balance currents flowing through multiple LED assemblies, simplifying circuitry and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent drivers are used to individually drive each LED assembly, then current control capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple LED assemblies are connected in parallel reverse order to share a common AC power source and current-equaling elements, merging the power supply function into a single shared component rather than using separate drivers for each assembly
Solution Approach 2:
The AC power generator and current-equaling elements serve multiple LED assemblies simultaneously, making the power supply system multi-functional rather than dedicated to single assemblies
2Measurement precision
If common chokes are used to equalize currents, then current balancing is achieved, but manufacturing cost and circuit size increase due to multiple magnetic elements
Solution Approach 1:
The patent uses non-magnetic current-equaling elements (resistors or capacitors) instead of expensive magnetic chokes, replacing magnetic components with simpler, cheaper electronic components that achieve the same current equalization function
Solution Approach 2:
The magnetic elements (chokes) are extracted and removed from the circuit, replacing them with non-magnetic current-equaling elements that eliminate the need for magnetic components while maintaining current balancing functionality
3Measurement precision
If common chokes are used for current equalization, then current balancing is attempted, but current balancing effect deteriorates due to magnetizing current induction
Solution Approach 1:
The patent converts the problematic magnetic effect into a non-magnetic solution by using resistive or capacitive elements, eliminating the harmful magnetizing current while maintaining the beneficial current equalization function
Solution Approach 2:
Magnetic field-based current equalization (using chokes) is replaced with electric field or resistive-based equalization (using capacitors or resistors), substituting magnetic mechanisms with electrical mechanisms to eliminate magnetizing current
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
The solution provides effective current balancing with improved uniformity and longevity of LEDs, while maintaining a simple and compact design, outperforming conventional methods in terms of current balancing efficacy and cost.
Implementation Method 1
a current balancing circuit, including a plurality of light-emitting diode assemblies... a first current-equaling element connected between the AC power generator and the first common node for balancing the current of the first light-emitting diode assembly and the current of the second light-emitting diode assembly
Data Source
AI summary
The invention provides a current balancing circuit, which includes a plurality of light-emitting diode assemblies; an AC power generator for providing currents required by the light-emitting diode assemblies; and a plurality of current-equaling elements connected to the AC power generator, each of which is connected to a common mode connecting two light-emitting diode assemblies for balancing currents of the light-emitting diode assemblies.