Color temperature adjusting circuit and electronic equipment

By controlling the current ratio of the LED circuit group through a single PWM signal source and an isolated optocoupler U1, the high cost and uneven color temperature caused by multiple PWM signals in the existing technology are solved, achieving precise color temperature adjustment and convenient circuit design.

CN224368007UActive Publication Date: 2026-06-16SHENZHEN SMALITE OPTOELECTRONICS CO LTD
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Patent Information

Application Number
CN202521375465.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2026-06-16
Estimated Expiration
2035-07-01

AI Technical Summary

Technical Problem

The color temperature adjustment circuit of existing LED equipment requires multiple PWM signals, which leads to high MCU storage capacity and program complexity, increases costs, and causes uneven color temperature mixing and flickering.

Method used

By using a single-channel PWM signal source and an isolated optocoupler U1, and controlling the conduction amplitude of drive units Q1 and Q2, multi-segment color temperature adjustment is achieved, simplifying the circuit structure and precisely controlling the current ratio of the LED circuit group.

Benefits of technology

It achieves precise color temperature adjustment, reduces costs, simplifies circuit structure, avoids uneven color temperature mixing and flickering, and improves the convenience and smoothness of color temperature adjustment.

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Abstract

The utility model provides a color temperature adjusting circuit and an electronic device. The color temperature adjusting circuit comprises a power supply VCC, a signal output circuit used for outputting a single-path PWM signal, and an LED circuit group respectively connected with the power supply VCC and the signal output circuit. The signal output circuit comprises a single-path PWM signal source, an isolation optocoupler (U1) and an optocoupler current-limiting resistor (R1) connected with the single-path PWM signal source and the isolation optocoupler (U1), the LED circuit group comprises a first circuit group and a second circuit group, and the single-path PWM signal source, the isolation optocoupler (U1) and the optocoupler current-limiting resistor (R1) control the magnitude of current of the first circuit group and the magnitude of current of the second circuit group to be mixed and proportioned. According to the multi-section color temperature adjusting circuit, accurate proportion control of the multi-path LED circuit group is realized by utilizing the single-path PWM circuit, so that more accurate color temperature adjustment is realized.
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