Single-Stage LED Driver with Synchronous Switch Control
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Solution Overview
Problem
Conventional high-voltage LED drivers are bulky and heavy, making them unsuitable for applications where size and weight constraints are a concern.
Innovation Solution
A single-stage driver system comprising a rectifier, a DC-to-DC converter with at least two switches, a resistor, and a controller that synchronously controls the switches to maintain a constant current through the LED device, allowing for efficient operation under high voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional two-stage LED drivers are used for high voltage conditions, then the driver can provide stable current to LED device, but the driver has large volume and heavy weight
Solution Approach 1:
The patent combines the rectifier and DC-to-DC converter into a single integrated driver circuit, eliminating the need for separate two-stage components. This merging reduces the overall volume and weight while maintaining the ability to provide stable current to the LED device under high voltage conditions.
Solution Approach 2:
The single-stage driver is designed to perform multiple functions: rectification, voltage conversion, and current regulation, all within one compact circuit. This multi-functionality allows the driver to handle high voltage inputs and provide stable LED current without requiring additional separate components, thus reducing volume.
2Reliability
If conventional two-stage LED drivers are used for high voltage conditions, then the driver can provide stable current to LED device, but the driver has heavy weight
Solution Approach 1:
The patent combines the rectifier and DC-to-DC converter into a single integrated driver circuit, eliminating the need for separate two-stage components. This merging reduces the overall weight while maintaining the ability to provide stable current to the LED device under high voltage conditions.
3Volume of moving object
If single-stage driver with synchronous switch control is used, then the driver achieves compact size and lightweight, but the driver must handle high voltage conditions efficiently
Solution Approach 1:
The patent employs dynamic synchronous control of switches within the single-stage driver, allowing the circuit to efficiently adapt to high voltage conditions. The switches are controlled to operate in synchronization, enabling the compact driver to handle high power inputs while maintaining current stability and efficient energy conversion.
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 enables a compact and lightweight LED driver system capable of handling high voltage inputs, providing a stable current to LED devices while optimizing size and weight constraints.
Implementation Method 1
a rectifier, configured to be coupled to the power supply and convert an alternating voltage from the power supply into a first direct voltage
Implementation Method 2
a DC-to-DC converter, coupled between the rectifier and the LED device and configured to receive the first direct voltage and provide a constant current to the LED device
Implementation Method 3
a controller, coupled between the resistor and the switches and configured to keep the current through the LED device stable around a predetermined current value by controlling the switches based on a voltage across the resistor
Data Source
AI summary
A single-stage driver for an LED device, configured to be coupled between a power supply and the LED device, comprises: a rectifier, a DC-to-DC converter, a resistor and a controller. The rectifier is configured to be coupled to the power supply and convert an alternating voltage from the power supply into a first direct voltage. The DC-to-DC converter, which comprises at least two switches, is coupled between the rectifier and the LED device and configured to receive the first direct voltage and provide a constant current to the LED device. The resistor is configured to be coupled in series with the LED device. The controller is coupled between the resistor and the at least two switches, and configured to keep the current through the LED device stable around a predetermined current value by controlling the switches based on a voltage across the resistor, wherein all the at least two switches are turned on or off synchronously.