Single-Stage LED Driver Circuit with Integrated Control
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Solution Overview
Problem
Conventional three-stage LED driver systems are complex, inefficient, and costly, with a large size, which makes them unsuitable for precise current and voltage regulation needed for LED driving.
Innovation Solution
A light-emitting element driver system with a power conversion circuit and control circuit that includes a primary circuit with a switch, a transformer, rectified circuits, and a control circuit to regulate both AC and DC signals, allowing for precise control of the LED driving signals using feedback loops and compensation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional three-stage LED driver system is used, then voltage and current conversion functions are provided, but the system becomes complex, large in size, and low in efficiency
Solution Approach 1:
The patent merges the functions of multiple stages into a single integrated LED driver circuit. The single-stage design combines voltage conversion, current regulation, and LED driving functions in one unified circuit structure, eliminating the need for separate PFC stage, isolated DC/DC converter stages, and LED driver stage. This integration directly reduces system complexity while maintaining the necessary voltage and current conversion capabilities through a unified control approach.
Solution Approach 2:
The LED driver circuit in the patent performs multiple functions simultaneously: it converts voltage, regulates current, provides isolation, and drives LED panels. The single-stage circuit is designed to handle both voltage conversion and current regulation tasks that were previously distributed across multiple specialized stages, making the circuit universal in its capabilities while simplifying the overall system architecture.
2Device complexity
If a single-stage LED driver system is used, then the structure is simplified and cost is reduced, but precise regulation of both voltage and current signals becomes more difficult
Solution Approach 1:
The patent implements feedback control mechanisms within the single-stage LED driver circuit. The control circuit monitors output voltage and current signals and adjusts switching duty cycles accordingly to maintain precise regulation. This feedback approach enables the simplified single-stage design to achieve the same regulation precision as complex multi-stage systems by continuously adjusting operating parameters based on actual output conditions.
Solution Approach 2:
The LED driver circuit employs dynamic switching control where the duty cycle of switching elements is continuously adjusted based on load conditions and desired output parameters. This dynamic regulation capability allows the single-stage circuit to adapt to varying operating conditions and maintain precise voltage and current control despite the simplified structure, overcoming the limitation of fixed-parameter designs.
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 system achieves high signal precision with a simple structure and low cost, enabling efficient regulation of both current and voltage signals simultaneously, thus improving the LED driving efficiency.
Implementation Method 1
a transformer, comprising a primary winding, a first secondary winding and a second secondary winding, the primary winding is coupled to the primary circuit to receive the AC signal
Data Source
AI summary
A light-emitting element driver system has a power conversion circuit, a second switch and a control circuit, the power conversion circuit has a primary circuit, a transformer, a first rectified circuit and a second rectified circuit, the second rectified circuit provides a first signal, the second switch has a first terminal coupled to an output terminal of the first rectified circuit and a second terminal to provide a second signal, when a dimming signal is in a first state, the control circuit provides a first control signal to control the power conversion circuit based on the first signal, and meanwhile provides a second control signal to control the second switch based on the second signal.