Current Control Circuit for LED Thyristor Dimmer Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional thyristor dimmer driving circuits face challenges in maintaining a conductive state for LED assemblies across various types of thyristors, leading to increased power consumption and flash issues due to differing holding currents and non-inverting conduction voltages.
Innovation Solution
A current control circuit that includes a transistor M1 and a transistor control circuit, where the transistor M1 is turned on or off based on feedback voltage to provide a compensation current for the thyristor, ensuring the thyristor remains in a conductive state without excessive power consumption, by setting a preset current based on the holding current of the thyristor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive current of the LED assembly is set higher to maintain the thyristor in a conductive state, then the thyristor can maintain a conductive state for various types, but the power consumption increases
Solution Approach 1:
The patent segments the current path by introducing a parallel branch with transistor Q1 that is independent from the LED assembly current path. This allows the thyristor holding current to be supplied separately through the transistor branch rather than forcing higher current through the LED assembly, thus maintaining reliability while reducing power consumption.
Solution Approach 2:
The transistor Q1 acts as an intermediary component that provides the necessary holding current to the thyristor without requiring the LED assembly to carry excess current. The transistor mediates between the power supply and the thyristor, enabling reliable thyristor operation while keeping the LED assembly current at optimal levels.
2Adaptability or versatility
If the number of LED assemblies is decreased to lower the non-inverting conduction voltage, then the thyristor can be turned on at lower voltage, but the operating current cannot be maintained and the thyristor does not work properly
Solution Approach 1:
The patent separates the voltage function (turning on the thyristor) from the current function (maintaining operation). The LED assemblies provide the voltage trigger to turn on the thyristor, while the transistor Q1 independently provides the current needed to maintain the thyristor in the on state. This segmentation allows the system to work at lower voltages without compromising thyristor operation.
Solution Approach 2:
The transistor Q1 serves as an intermediary that decouples the voltage and current requirements. It allows the system to use fewer LED assemblies for voltage triggering while ensuring the thyristor receives adequate holding current through the transistor branch, thus maintaining reliable operation at lower voltages.
3Adaptability or versatility
If the conductive current is set higher to accommodate various types of thyristors with different holding currents, then the circuit can apply to maximum variety of thyristors, but the power consumption increases
Solution Approach 1:
The transistor Q1 provides a dynamic current path that can adapt to different thyristor holding current requirements. By adjusting the base current to the transistor, the circuit can accommodate various thyristor types without requiring a fixed high current setting, thus achieving versatility while minimizing power consumption for each specific application.
Solution Approach 2:
The transistor acts as an adaptive intermediary between the power supply and the thyristor, allowing the circuit to match different thyristor holding current requirements without forcing a high current through the LED assembly. This enables compatibility with various thyristor types while maintaining efficient power consumption.
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 current control circuit reduces power consumption by not requiring a higher conductive current for the LED assembly, maintains the thyristor in a conductive state throughout the AC period, and prevents flash states by adjusting the transistor's operation according to the preset current.
Implementation Method 1
a first transistor M1 and a transistor control circuit 205, wherein a drain of the first transistor M1 is connected to the anode of the LED assembly, a gate of the first transistor is connected to a control voltage output terminal of the transistor control circuit 205, the first transistor M1 is turned on or turned off according to a control voltage provided by the control voltage output terminal of the transistor control circuit
Implementation Method 2
a rectifier 203, and a thyristor 204, the thyristor 204 is connected in series between an AC power supply and the rectifier 203, the rectifier 203 rectifies an input AC voltage provided by the thyristor
Data Source
AI summary
The present invention provides a current control circuit for a driving circuit system of a LED assembly, wherein the driving circuit system includes a current module, a rectifier, and a thyristor, the thyristor is connected in series between an AC power supply and the rectifier, the rectifier rectifies an input AC voltage provided by the thyristor and provides a rectified voltage to an anode of the LED assembly, and an input terminal of the current module and a cathode of the LED assembly are connected to set a current flowing through the LED assembly.