How does the switching power supply to adjust the color temperature of the LED light and LED strip?
To adjust the color temperature of the LED lights and LED strips by the power supply,
The dimming terminal of power supply is controlled by PWM1 signal, and the OUTPUT current Io of LED is adjusted by adjusting the duty ratio of PWM1 to achieve the dimming of LED lamps.
In order to achieve color temperature adjustment, one cold white LED array and one warm white LED array with relatively close on-voltage drop are connected to the output end of power supply, and power switch MOS1 and MOS2 are used to control the on-off of cold white LED array and the on-off of warm white LED array respectively.
PWM2 signal is connected to MOS1 grid to control the conduction time of cold white LED array. PWM2 signal is obtained after the inverter. PWM3 is connected to MOS2 grid to control the conduction time of warm white LED array.
PWM2 is at high power level, PWM3 is at low level, so the cold white LED array is on, the warm white LED array is off, and vice versa. Adjust the duty cycle of PWM2 to adjust the turn-on time ratio of cold white LED array and warm white LED array in unit time, and use the transient time of human eye presence to achieve the effect of color temperature change.
There are one model of the LED dimmable power supplies for your reference,more details please check the below pictures,thanks!
Also KAIHUI has the engineers team,so if you have any good ideas please contact us(E-mail:amy@gzkaihui.c),the customized power supply is welcomed.
