Integrated LED Lamp Power Circuit for Compact Brightness Control
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Solution Overview
Problem
Existing power supply circuits for color-changing LED lamps have a complex circuit structure due to separate PWM controllers and MOS transistors, leading to a large number of components and hindering miniaturization.
Innovation Solution
A power supply circuit integrating a MT3612 chip that combines a power switch transistor and PWM controller, along with other components like rectification and filtering circuits, reducing the number of components and simplifying the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate PWM controller and MOS transistor are used, then the circuit can achieve lamp brightness adjustment, but the circuit structure becomes complex and occupies large PCB area
Solution Approach 1:
The patent combines the PWM controller and MOS transistor into a single integrated driver chip, merging two previously separate components into one unified device. This integration directly reduces the number of components on the PCB, simplifies the circuit structure, and decreases the occupied area while maintaining the brightness adjustment functionality through the chip's internal control mechanisms.
2Ease of operation
If separate PWM controller and MOS transistor are used, then the circuit can achieve lamp brightness adjustment, but the number of components increases
Solution Approach 1:
The patent merges the PWM controller and MOS transistor functions into a single integrated driver chip, reducing the total component count. This consolidation eliminates the need for separate peripheral components that would be required for the independent PWM controller and MOS transistor, thereby decreasing the overall number of components while preserving the brightness control capability.
3Ease of operation
If separate PWM controller and MOS transistor are used, then the circuit can achieve lamp brightness adjustment, but the PCB area occupied increases
Solution Approach 1:
The patent integrates the PWM controller and MOS transistor into one compact driver chip, significantly reducing the space required on the PCB. This integration eliminates the need for separate component footprints, trace routing, and associated peripheral components, thereby minimizing the overall PCB area occupied while maintaining full brightness adjustment functionality.
Data Source
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AI summary
Embodiments of the present invention discloses a power supply circuit for a color changing LED lamp, including an input rectification circuit, an input filtering circuit, a control circuit, a transformer T1, an output rectification circuit, and an output filtering circuit; an input terminal of the input rectification circuit is connected to an AC power, an output terminal of the input rectification circuit is connected to the input filtering circuit. The input filtering circuit and the control circuit are both connected to an original side of the transformer T1; the output rectification circuit and the output filtering circuit are both connected to a secondary side of the transformer T1. The control circuit includes a first chip U1, which is in a model of MT3612. Through the above arrangement, the circuit is more integrated, the number of components in the circuit can be reduced, the circuit structure can be simplified, and the size of circuit board can be reduced.