Optoelectronic Circuit with Shared Difference Amplifier for LED Arrays
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Solution Overview
Problem
Existing optoelectronic circuits with light-emitting diodes face challenges when supplied with alternating voltage, including prolonged phases of absence of light emission and high electrical consumption, complexity, and increased manufacturing costs due to the need for multiple difference amplifiers and complex switching mechanisms.
Innovation Solution
An optoelectronic circuit design featuring sets of light-emitting diodes connected in series with a conduction circuit whose electrical conductance varies based on a control signal, utilizing a control circuit with a difference amplifier and current mirrors to slave the voltage to a reference voltage with varying offsets for each conduction circuit, reducing the number of components and enhancing continuous current supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the number of light-emitting diodes is reduced to increase the duration of ON phases, then the light emission continuity is improved, but the electrical power loss in the resistor increases
Solution Approach 1:
The patent applies dynamics by making the number of light-emitting diodes in series dynamically adjustable rather than fixed. The switching device changes the configuration of diodes in series based on the instantaneous supply voltage level, allowing the circuit to adapt between having more diodes (during high voltage) or fewer diodes (during low voltage) to maintain continuous operation and reduce power losses.
2Duration of action of stationary object
If a switching device is added to progressively increase the number of light-emitting diodes during voltage increase phase, then the light emission continuity is improved, but the device complexity and manufacturing cost increase due to requiring a difference amplifier for each group
Solution Approach 1:
The patent merges multiple difference amplifier functions into a single shared difference amplifier. Instead of having one difference amplifier per group of light-emitting diodes, the invention uses one amplifier that sequentially serves multiple groups through the switching device, dramatically reducing component count and circuit complexity while maintaining the same functional capability of progressive diode activation.
Solution Approach 2:
The switching device is designed with multi-functionality, serving both as a configuration switch for different diode groups and as a voltage-responsive control element. The single switching device handles multiple functions: selecting which diode groups are active, responding to voltage levels, and enabling the shared difference amplifier to serve multiple purposes across different operational phases.
3Duration of action of stationary object
If a switching device with multiple difference amplifiers is used to control groups of light-emitting diodes, then the light emission continuity is improved, but the electrical consumption of the optoelectronic circuit increases
Solution Approach 1:
The patent merges multiple difference amplifier functions into a single shared difference amplifier that sequentially controls different groups of light-emitting diodes. This consolidation eliminates the need for multiple parallel amplifiers, significantly reducing the total electrical consumption while maintaining continuous light emission through progressive group activation.
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 design reduces the duration of light emission absence phases, lowers electrical consumption, and simplifies the switching device, thereby improving reliability and reducing manufacturing costs while maintaining efficient power factor and temperature protection.
Implementation Method 1
an optoelectronic circuit comprising light-emitting diodes
Implementation Method 2
When the voltage V ALIM is greater than the sum of the threshold voltages of the light-emitting diodes 16, the light-emitting diodes 16 turn on
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The invention relates to an optoelectronic circuit (20) for receiving a variable voltage (VALIM) containing alternating rising and falling phases. The optoelectronic circuit comprises series-connected arrays of light-emitting diodes (Di), a node (A3) connected to each array (Di) by a conduction circuit (SWi) whose electrical conductance varies according to a control signal (Si), and a control circuit (28) connected to each conduction circuit and adapted to provide each control signal by comparing a first voltage (VSOURCE) at said node to at least one second voltage (VREF). The control circuit comprises a difference amplifier (30) and as many output stages as there are conduction circuits, the control circuit being adapted to lock the first voltage to the second voltage offset by a third voltage, different for each output stage.