Buck-Boost LED Circuit With Individual Current Control
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Solution Overview
Problem
Conventional buck-boost converting circuits for LEDs connected in series lack individual current control, leading to inefficient power consumption and reduced efficiency when all LEDs must be turned on simultaneously, and dividing the circuit into buck and boost converters results in low overall efficiency.
Innovation Solution
A buck-boost converting circuit with an LED current regulator and bypass switches controlled by PWM signals, allowing for independent control of LED currents and integration of buck and boost modes to prevent unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional buck-boost converting circuit controls currents of LEDs connected in series in batches through one path, then the circuit structure is simple, but it is impossible to selectively use only an LED at a specific location and all LEDs must be turned on in batches, causing power consumption to increase in proportion to the number of LEDs
Solution Approach 1:
The patent divides the series-connected LED string into multiple parallel paths, with each path containing at least one LED. This segmentation allows independent control of each LED or group of LEDs through individual current regulators and bypass switches, enabling selective operation and reducing overall power consumption when not all LEDs need to be active.
2Ease of operation
If a buck-boost converting circuit is divided into a buck converter and a boost converter to individually control currents of LEDs, then individual LED current control is achieved, but the total efficiency is represented as the multiplication of efficiency of the boost converter and efficiency of the buck converter, causing sudden decrease in total efficiency when one converter's efficiency decreases
Solution Approach 1:
The patent merges the buck converter and boost converter into a single integrated buck-boost converting circuit. This unified structure eliminates the efficiency multiplication problem by having one converter handle both buck and boost operations, thereby maintaining higher overall efficiency while still enabling individual LED current control through the segmented LED paths with current regulators.
3Use of energy by moving object
If all LEDs are turned off, then power consumption is reduced, but excessive currents may still flow into the LEDs through bypass switches, causing unnecessary power consumption
Solution Approach 1:
The patent incorporates LED current regulators in each parallel path that actively monitor and control the current flowing through the LEDs and bypass switches. This feedback mechanism ensures that when bypass switches are activated to turn off LEDs, the current regulators prevent excessive current flow, thereby eliminating unnecessary power consumption while maintaining the ability to selectively control LED operation.
Data Source
AI summary
Provided is a buck-boost converting circuit including an LED current regulator and bypass switches. The buck-boost converting circuit includes switches coupled in a matrix form in order to individually control a plurality of LEDs connected in series, an LED current regulator, and a circuit capable of buck-boost conversion.