LED Driver Circuit Shared Inductance Buck-Boost Topology
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Solution Overview
Problem
Existing driver circuits for light-emitting diode arrangements cannot efficiently convert input voltage to either higher or lower output voltage levels required for different numbers of series-connected LEDs, necessitating complex H-bridge circuits for buck-boost conversions.
Innovation Solution
A driver circuit utilizing a boost converter inductance and a buck converter inductance with a single switching unit, along with a rectifying unit and storage capacitance, allows for both boost and buck conversions without the need for a complex H-bridge circuit, enabling efficient voltage regulation for light-emitting diode arrangements with varying numbers of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex H-bridge circuit is used for buck-boost conversion, then both boost and buck conversions can be achieved, but the device complexity increases significantly
Solution Approach 1:
The patent combines the boost converter inductance and buck converter inductance into a single shared inductance component. This merging eliminates the need for separate inductors and the complex H-bridge switching circuitry, achieving both boost and buck voltage conversion capabilities while significantly reducing device complexity. The single inductance serves dual purposes in different switching states, resolving the contradiction between versatility and complexity.
2Measurement precision
If a driver circuit is designed for a specific number of series-connected LEDs, then the current control is precise, but the adaptability to different LED configurations is limited
Solution Approach 1:
The driver circuit is designed with a shared inductance and controlled switching mechanism that enables it to function as a boost converter, buck converter, or either mode depending on the switching state. This universal design allows the same circuit to adapt to different numbers of series-connected LEDs (1-14 LEDs as mentioned in the patent) and different input voltage ranges (6V-20V), maintaining precise current control across all configurations without requiring circuit redesign.
3Use of energy by moving object
If separate inductors are used for boost and buck converters, then the voltage conversion is efficient, but the component quantity and circuit complexity increase
Solution Approach 1:
The patent merges the boost converter inductance and buck converter inductance into a single shared inductance component. This reduces the component quantity from two separate inductors to one, while the controlled switching mechanism ensures that the inductance operates efficiently in either boost or buck mode as needed, maintaining voltage conversion efficiency while reducing component count and circuit complexity.
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 simplifies the component layout and control process, reducing the need for multiple switching units and enabling precise current control, while also providing a dimming function, thus effectively addressing the voltage conversion requirements for a wide range of LED configurations.
Implementation Method 1
a boost converter inductance in order to convert an input voltage from the voltage source to a higher voltage level for the light-emitting diode arrangement
Implementation Method 2
a buck converter inductance connected between the rectifying unit and the anode terminal and/or between the cathode terminal and the circuit node
Data Source
AI summary
A driver circuit for a light-emitting diode arrangement has a supply terminal for connecting a voltage source. A boost converter inductance connects the supply terminal to a common circuit node. A switching unit connects the circuit node to ground depending on a switching signal. A rectifying unit connects the circuit node to an anode terminal for the light-emitting diode arrangement by way of a circuit branch to which a terminal of a storage capacitance and a terminal of an RC element are connected. A cathode terminal for the cathode side of the light-emitting diode arrangement is electrically connected to the circuit node. A buck converter inductance is connected in each case between the rectifying unit and the anode terminal and/or between the cathode terminal and the circuit node.