A constant power output control circuit

By generating a power reference signal through current and voltage sampling, and combining it with current loop and voltage loop control, constant power output is achieved, which solves the power imbalance problem caused by load fluctuations, extends the life of LED lamps, supports dimming function, and improves the stability and reliability of LED lighting systems.

CN122248601APending Publication Date: 2026-06-19DONGGUAN BECKY ELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGGUAN BECKY ELECTRONICS TECH CO LTD
Filing Date
2026-04-28
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing constant voltage or constant current control methods are difficult to maintain constant power when the load changes, which leads to overheating and aging of LED beads, accelerated light decay, and color shift of light emission. In addition, they lack support for dimming function and cannot meet users' needs for smooth dimming.

Method used

It employs a current sampling and amplification module, an output voltage sampling module, a multiplication operation module, a current loop control module, a voltage loop control module, and a power main control module. By sampling the output current and voltage in real time, it generates a power reference signal and adjusts the output current to achieve constant power control, and combines overvoltage protection and PWM dimming functions.

Benefits of technology

It effectively avoids power imbalance caused by load fluctuations, reduces light decay and color shift of LED light sources, extends product lifespan, improves the stability and reliability of lighting systems, and enables flexible dimming.

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Abstract

This invention discloses a constant power output control circuit, relating to the field of switching power supply control technology. It includes a current sampling and amplification module, an output voltage sampling module, a multiplication operation module, a current loop control module, a voltage loop control module, and a power main control module. By sampling the output current and voltage in real time, a power reference signal is generated through multiplication. The current loop compares the difference and adjusts the output current to achieve constant power control, while the voltage loop provides overvoltage protection. This circuit effectively avoids power imbalance caused by load fluctuations, reduces LED light decay and color shift, extends lifespan, and supports smooth PWM dimming. It has the advantages of simple structure, good dynamic response, and high reliability.
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