Comparison of the advantages and disadvantages of three dimming color power supply architectures

Entering this era, consumers are not satisfied with the simple lighting that turns on the light, and the LED light based on semiconductor technology brings unlimited development space for intelligent control.

In the popularization stage of LED lights in 2011-2014, the “light-adjustable” and “color-temperature adjustable” lamps have been adopted by major brands in 2015. In the double eleven in 2015, Opodore and others launched the smart lighting package as a double eleven main battle weapon.

It is expected that 2016 will be the first year of smart lighting, and dimming will become the main choice for home decoration.

First, a brief introduction to the structure of the dimming color grading lamp:

Dimming:

The brightness is adjustable from 3% to 100%. Commonly used scenes such as --- night children look at 3% of the moonlight, 30% warm white light when watching TV, 100% warm white light for dinner and party.

Toning:

The color temperature is adjusted between warm white and white, and white can enhance people's attention and is suitable for reading and learning. Warm white makes people feel relaxed and suitable for leisure and entertainment. Of course, due to the change of color, Zhengbai is also suitable for hot weather, while warm white makes people feel warmer in winter.

The combination of warm and cold color temperature and brightness will be suitable for various scenes of the family, and the dimming color lamp with little increase in cost will replace the ordinary LED lamp to become the main force of home lighting and office lighting.

To sum up, the difference between dimming and color luminaires and ordinary LED luminaires is mainly as follows:

There are two color temperature lamps in white and warm white (also manufacturers have introduced two-color lamp beads);

Use dimming color power: dimming color power supply is to output two currents, all the way to warm white light beads, the other light up the white light beads. Different brightness and different color temperatures can be achieved by adjusting the magnitude and proportion of the two currents.

Power supply

Dimming color power supplies mainly have three architectures: "output adjustment type", "double transformer type" and "chip linkage type".

First of all, let's talk about the characteristics of LED. Everyone knows that LED is a constant current type. If the current is changed, the color temperature will change. How to maintain constant current during current regulation? PWM adjustment is required.

Here we have a special term for science - PWM dimming:

Generally speaking, PWM dimming means that the current is in the switching state, which is 280mA when it is turned on and 0mA when it is turned off. If the opening time is 10%, then it is 28mA, so changing the ratio of open time (duty ratio) can be different. Average current.

The figure below shows the opening times in PWM: 10%, 30%, 50% and 90%.

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Jiangmen City Pengjiang District Qihui Lighting Electrical Appliances Co., Ltd , https://www.qihuilights.com