LED Current Control Circuit Using Single-Connection Digital Coding
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Solution Overview
Problem
Existing methods for controlling the brightness of LEDs often rely on external resistors, which introduce undesirable side-effects and lack precise current regulation, leading to undesirable brightness variations.
Innovation Solution
A device and method that control an analog signal via a single connection without an external resistive element, using a control unit to generate a precisely controlled current based on coded data, with modes for default, programmable, testing, and shutdown operations, employing one-shot timers and decode protocols to regulate current flow through LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external resistors are used to modulate current through LED, then current control is achieved, but noise and energy consumption increase
Solution Approach 1:
The patent removes the external resistor from the system entirely, extracting the harmful element that caused noise and energy consumption issues. Instead of using an external resistor for current modulation, the invention integrates current control functionality directly into the LED package, eliminating the source of noise and unnecessary energy loss.
Solution Approach 2:
The patent combines multiple functions (current regulation, signal processing, and LED control) into a single integrated circuit within the LED package. This merging eliminates the need for separate external components like resistors, thereby reducing noise while maintaining precise current control capability.
2Measurement precision
If external resistors are used to modulate current through LED, then current control is achieved, but device complexity increases
Solution Approach 1:
The patent integrates the control circuit, signal processing unit, and current regulation functionality into a single integrated circuit within the LED package. This consolidation reduces device complexity by eliminating multiple external components and interconnections while maintaining precise current control capability.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously: it processes control signals, regulates current, and drives the LED. This multi-functionality reduces overall device complexity by replacing multiple specialized external components with a single universal control unit.
3Ease of operation
If voltage changes are applied to LED, then current changes occur, but brightness variations become uncontrolled
Solution Approach 1:
The patent implements a feedback control mechanism within the integrated circuit that monitors the actual current through the LED and adjusts the drive signal accordingly. This feedback loop ensures that brightness remains precisely controlled even when voltage changes are applied, maintaining stable LED operation.
Solution Approach 2:
The control circuit dynamically adjusts the current drive signal in real-time based on the applied voltage and LED characteristics. This dynamic control ensures precise brightness regulation while maintaining ease of voltage control flexibility throughout operation.
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
Enables precise and flexible control of current through LEDs without external resistors, reducing noise and energy consumption while allowing user-defined brightness settings, applicable to various LED types and applications.
Implementation Method 1
A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction of the p-n junction. This effect is a form of electroluminescence.
Data Source
AI summary
Techniques pertaining to device and method for controlling an analog signal are disclosed. Using a single connection (e.g., a connector or a pin) without an external resistive element (e.g., a resistor), an analog output is digitally controlled and produced. In one embodiment, a precisely controlled current is generated from coded data. A control unit is designed to control a working mode based on an input signal from the connection. The working mode includes a default mode, a programmable mode, a testing mode and a shutdown mode. Under the programmable mode, a user determines a signal coupled in from the connection as desired, and a code unit codes the signal in accordance with a predefined protocol. The code unit then sends the coded data to a decode unit. The decode unit is designed to generate or control the current by the decoded data.