Color LED Driving Circuit High-Voltage Isolation
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Solution Overview
Problem
Conventional color LED driving circuits with discrete components like opto-couplers and MOS transistors result in complex structures with low efficiency due to high current consumption and demanding manufacturing processes.
Innovation Solution
A color LED driving circuit with a switch assembly and separate controllers, where the ground terminal of the first controller is separated from the reference terminal of the second controller, allowing for natural high-voltage isolation without additional isolation islands, reducing manufacturing demands and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete components such as opto-coupler and MOS transistors are used to implement color LED driving circuit, then the circuit can achieve color-adjusting function, but the structure becomes complex and efficiency decreases due to high current consumption
Solution Approach 1:
The patent merges the opto-coupler and MOS transistor functions into a single integrated opto-MOS device. The opto-MOS integrates the opto-coupler's light isolation function and the MOS transistor's switching function in one component, reducing the number of discrete components and simplifying the circuit structure while maintaining the color-adjusting capability.
Solution Approach 2:
The opto-MOS device serves multiple functions: it acts as both an optical isolator and a voltage-controlled switch. This multi-functional component replaces the need for separate opto-coupler and MOS transistor, reducing circuit complexity while preserving the ability to control LED color output.
2Reliability
If opto-coupler is used for high-voltage isolation, then isolation function is achieved, but current consumption increases and efficiency decreases
Solution Approach 1:
The opto-MOS integrates the opto-coupler and MOS transistor into a single device where the opto-coupler's isolation function is combined with the MOS transistor's low-current switching capability. This integration reduces the overall current consumption while maintaining high-voltage isolation reliability.
Solution Approach 2:
The patent changes the operating parameters by using the integrated opto-MOS device which has optimized current characteristics. The device operates with lower current consumption compared to discrete opto-coupler configurations, improving efficiency while maintaining the isolation function through integrated design.
3Reliability
If high-voltage die with fully isolated high-voltage island is used, then high-voltage isolation is achieved, but manufacturing process demands increase
Solution Approach 1:
The opto-MOS device merges the isolation function and switching function in a single integrated component that can be manufactured using standard semiconductor processes. This eliminates the need for complex fully isolated high-voltage islands on the die, as the isolation is achieved through the integrated opto-coupler structure within the opto-MOS device itself.
Solution Approach 2:
The patent extracts the high-voltage isolation function into the opto-MOS device's internal structure rather than requiring a separate fully isolated high-voltage island on the die. This extraction of the isolation function to the component level simplifies the manufacturing process while maintaining reliable high-voltage isolation.
Data Source
AI summary
The present application provides a color LED driving circuit, which comprises a set of switches and a color controller. The switch assembly has a first switch and a second switch, respectively having a first terminal, a second terminal and a control terminal. The first terminal of the first switch is configured to be coupled to a first LED load, and the first terminal of the second switch is configured to be coupled to a second LED load. The color controller comprises a first controller and a second controller. A ground terminal of the first controller is coupled to ground. The first controller is used to generate an output signal according to a PWM signal, and transmit the output signal to the second controller. The second controller is used to generate a first driving signal and a second driving signal according to the output signal, and output the first driving signal and the second driving signal to the control terminals of the first switch and the second switch through a first driving terminal and a second driving terminal, respectively. A reference terminal of the second controller is coupled to the second terminal of the first switch and the second terminal of the second switch, and potential of the reference terminal is different from a potential of the ground terminal of the first controller.