Three-Phase LED Power Supply with Active FET Rectification
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Solution Overview
Problem
Existing LED systems face issues with power losses due to heat dissipation and susceptibility to overvoltage, which affect their efficiency and reliability.
Innovation Solution
A three-phase power supply system that uses field-effect transistors (FETs) in conjunction with a microcontroller to actively control the rectification process, minimizing energy losses and incorporating passive zero segments and antistatic protection to manage voltage and prevent electrostatic discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional rectification methods are used in LED systems, then the system can operate with simple circuitry, but power losses due to heat dissipation increase significantly
Solution Approach 1:
The patent implements dynamic control of rectification by using field-effect transistors (FETs) that are actively switched based on the instantaneous voltage levels of the three-phase AC supply. The microcontroller monitors the phase voltages and controls the FETs to conduct only during favorable voltage intervals, enabling the rectification process to adapt dynamically to supply conditions and minimize power losses while maintaining manageable circuit complexity
Solution Approach 2:
The patent changes the operational parameters of the rectification process by controlling the switching timing of FETs based on instantaneous voltage measurements. By adjusting when the FETs conduct during each AC cycle based on voltage thresholds and phase relationships, the system optimizes energy transfer efficiency and reduces heat dissipation without requiring overly complex circuit architecture
2Reliability
If standard power supply circuits are used, then the design is simple, but the system becomes susceptible to overvoltage damage
Solution Approach 1:
The patent incorporates feedback control by using the microcontroller to continuously monitor the voltage levels from the three-phase AC supply and adjust the switching states of the FETs accordingly. This feedback mechanism detects overvoltage conditions and prevents them from reaching the LED modules by controlling the rectification process, enhancing reliability while keeping the added circuit complexity minimal
Solution Approach 2:
The patent implements preliminary protection by proactively controlling the rectification process before overvoltage can damage the LED system. The microcontroller predicts potentially harmful voltage conditions and adjusts FET switching in advance to block or redirect excessive voltage, preventing damage before it occurs rather than relying on reactive protection circuits
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 significantly reduces power losses and enhances the reliability of the LED system by minimizing heat dissipation and protecting against overvoltage, while maintaining high efficiency and stability.
Implementation Method 1
A three-phase power supply system that uses field-effect transistors (FETs) in conjunction with a microcontroller to actively control the rectification process
Implementation Method 2
The three-phase power supply has an input connected to the three-phase power supply line and an output connected to a switching system of a LED sequencer
Data Source
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AI summary
In a three-phase power supply comprising a rectifier bridge circuit of six rectifying diodes and having for each phase one unit of two rectifying diodes (101, 102, 103, 104, 105, 106) connected in series at a connection point (121, 123, 125), whereby an unconnected cathode of each unit of two rectifying diodes is connected to a pole of a DC power supply system, especially supplying a LEDs system with LED segments, and an unconnected anode of another diode of each unit of two rectifying diodes (101, 102, 103, 104, 105, 106) connected at the connection point (121, 123, 125) is connected to (-U) pole of the DC power supply system supplying the electronic device provided with a control, to each rectifying diode (101, 102, 103, 104, 105, 106) of the rectifier bridge circuit of six rectifying diodes is connected directly in parallel a field-effect transistor (FET) of a rectifying unit (111, 112, 113, 114, 115, 116) carrying electric current in the same direction as the rectifying diode bypassed by the field-effect transistor (FET).