Light Source Driving Circuit Voltage Segmentation
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Solution Overview
Problem
Conventional light source driving circuits experience a decrease in power efficiency and poor heat dissipation when the input AC voltage increases, leading to larger power loss and noticeable variations in brightness.
Innovation Solution
The proposed light source driving circuit employs a dual-switch control mechanism, where the first and second switches are selectively turned on or off based on the DC voltage range, with current regulators and controllers managing the current through multiple LED strings to maintain constant output power and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional driving circuit uses a single switch and control mechanism, then the device complexity is low, but the power efficiency decreases and heat dissipation becomes poor when input AC voltage increases
Solution Approach 1:
The patent divides the LED array into multiple strings with different numbers of LEDs, and assigns different switches and control mechanisms to each string. This segmentation allows each string to be independently controlled based on voltage conditions, improving overall power efficiency while managing complexity through modular design
Solution Approach 2:
The patent implements dynamic control where the system automatically switches between different operating modes (single string mode, dual string mode, etc.) based on the input AC voltage level. The control circuitry dynamically selects which switches to activate and which LED strings to drive, optimizing power efficiency across varying voltage conditions
2Power
If the input AC voltage increases, then the available power increases, but the power efficiency decreases and brightness becomes unstable
Solution Approach 1:
The patent changes the operating parameters by selecting different LED string configurations based on input voltage levels. When input voltage is high, the system activates more LED strings or adjusts switch configurations to match the available power, preventing energy waste while maintaining stable output. The control circuit monitors voltage and dynamically adjusts the number of active strings
3Illumination intensity
If a conventional driving circuit uses fixed switch control, then the ease of operation is high, but noticeable brightness variations occur with voltage changes
Solution Approach 1:
The control circuit incorporates feedback mechanisms that monitor the actual voltage level and adjust the switch control signals accordingly. This feedback ensures that the LED strings are activated in a way that maintains constant brightness output, compensating for voltage variations without requiring manual intervention
Data Source
AI summary
A light source driving circuit for powering a first light source and a second light source by a DC voltage includes a first control circuitry and a second control circuitry. If the DC voltage is within a first range, then the first control circuitry controls a first switch and the second control circuitry controls a second switch to turn on the first light source and to regulate a current flowing through the first light source. If the DC voltage is within a second range, then the first control circuitry controls a third switch and the second control circuitry controls a fourth switch to turn on the first light source and the second light source and to regulate a current flowing through the first light source and the second light source.