LED Lamp Control System Using Two-Wire Signal Encoding
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Solution Overview
Problem
Existing LED lamp control systems require multiple control lines, increasing layout complexity and structure size, and can cause stroboscopic lighting effects due to PWM signal dimming.
Innovation Solution
An LED lamp control system utilizing a power supply with a MOS transistor, signal encoding and decoding modules, and a DC/DC converter, which reduces the number of transmission and control lines to two, and converts PWM signals into dimming signals to avoid stroboscopic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple control lines are used to control cool color and warm color LED lamps separately, then the control precision and independence of each LED set is improved, but the device complexity and layout difficulty increase
Solution Approach 1:
The patent combines the control of cool color and warm color LED lamps into a single control line by encoding separate control signals for both LED sets into one transmitted signal. The receiving end decodes this single signal to independently control each LED set, thereby reducing the number of control lines while maintaining independent control capability.
Solution Approach 2:
The single control line is designed to carry multiple functions simultaneously - it transmits both control signals for cool color LEDs and warm color LEDs through the same physical medium. This multi-functional approach eliminates the need for separate dedicated control lines for each LED color temperature setting.
2Measurement precision
If PWM signal dimming is used to adjust brightness, then the brightness control range and precision are improved, but stroboscopic lighting effects occur causing harmful visual impact
Solution Approach 1:
The patent converts the potentially harmful PWM dimming approach into a beneficial solution by using high-frequency PWM signals that are imperceptible to the human eye. The stroboscopic effect is eliminated by operating at frequencies above the human visual threshold, while still maintaining the precision benefits of PWM control for brightness adjustment.
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 layout and structure of the lamp while preventing stroboscopic lighting, allowing for efficient control of LED lamp parameters using only two wires and improving light quality.
Implementation Method 1
a power supply configured to convert a utility power into a DC constant voltage output
Implementation Method 2
a MOS transistor electrically connected to one of the first and second power supply output terminals, a signal encoding module for controlling the on and off of the MOS transistor
Implementation Method 3
the signal decoding module is configured to convert a PWM signal loaded on the power supply output terminal connected to the MOS transistor into a dimming signal
Implementation Method 4
the DC/DC converter is configured to control the output parameters of the LED lamp according to the dimming signal
Implementation Method 5
a filter capacitor electrically connected to the first lamp input end and the second lamp input end
Data Source
Figure 1
Figure 2
AI summary
An LED lamp control system comprises a power supply, a MOS transistor, a signal encoding module, a control signal input module, a signal change judging module, a MOS transistor control module, an LED lamp, a filter capacitor, and a signal decoding module, and a DC/DC converter. The signal encoding module is configured to convert the control signal output by the control signal input module into a PWM signal, and the output of the signal encoding module is connected to the gate of the MOS transistor and output a PWM signal to control the on and off of the MOS transistor, the signal decoding module is configured to convert a PWM signal loaded onto the power supply output which is connected to a MOS transistor to a dimming signal. The DC/DC converter controls the output parameters of the LED lamp according to the dimming signal. The invention makes the connection between the power supply and the LED lamp only use two wires to complete the connection between the lamp and the power supply, thereby helping to reduce the typographical difficulty of the lamp line and also facilitating the control of the structure size of the lamp.