一, Principle of Infinite Dimming Technology: Evolution from Analog to Digital
The core of infinite dimming lies in achieving continuous changes in the brightness of the light source, and its technical path can be divided into two categories: analog dimming and digital dimming:
1. Simulated dimming: Linear control based on current
Simulated dimming achieves brightness changes by adjusting the magnitude of the LED driving current. Its typical implementation methods include:
Resistance voltage control: By using adjustable resistors to change the voltage division in the circuit, the current flowing through the LED can be adjusted. For example, in a bidirectional thyristor dimming circuit, the conduction angle is controlled by adjusting the charging speed of the capacitor, thereby changing the power supply time of the lamp during the AC cycle and achieving stepless brightness adjustment.
Constant current power regulation: using analog linear technology to directly adjust the output current of the driving module. For example, a 0-10V dimming system controls the reference value of the driver's steady current loop through an external voltage signal, allowing the output current to continuously vary within the range of 0% -100%.
This type of technology has lower costs, but there is an issue of efficiency loss. For example, in current limiting mode dimming, when the transistor operates as a variable resistor, some of the electrical energy is dissipated in the form of thermal energy, resulting in a decrease in driving efficiency.
2. Digital dimming: high-frequency PWM and intelligent integration
Digital dimming is based on pulse width modulation (PWM) technology, which adjusts the average current by controlling the duty cycle of the square wave signal
High frequency PWM dimming: using a chopping frequency of hundreds to thousands of hertz, making flicker imperceptible to the human eye. For example, a certain brand of linear lamp generates high-frequency PWM signals through CPWM chips, adjusts the duty cycle from 1% to 100%, and achieves smooth brightness transition.
Intelligent Stepless Dimming: Integrated with Bluetooth, Wi Fi, or infrared modules, remote adjustment can be achieved through a mobile app or voice control. For example, the OC7102 chip released in 2024 supports integrated touch control and PWM dimming, marking the maturity of single-chip solutions.
The advantages of digital dimming are high precision, fast response, and the ability to optimize flicker indicators through algorithms. For example, the adaptive stepless dimming algorithm utilizes neural PID control to achieve dynamic brightness adjustment in tunnel lighting, while controlling the flicker effect visibility (SVM) below 0.3.
二, The core advantages of infinite dimming LED linear lights
1. Health lighting: eliminate flicker hazards
Traditional dimming methods, such as TRIAC dimming, may produce low-frequency flicker at low brightness, causing visual fatigue, headaches, and even photosensitive epilepsy. And infinite dimming can increase the flicker frequency to kilohertz level through high-frequency PWM or analog DC dimming, completely eliminating the flicker that can be perceived by the human eye. For example, a laboratory test showed that a linear lamp using high-frequency PWM dimming had an SVM value of only 0.12 at 50% brightness, far below the safety limit of SVM<1 in the IEEE Std 1789 standard.
2. Scene adaptation: comprehensive coverage from functionality to atmosphere
Infinite dimming supports 1% -100% brightness adjustment and continuous color temperature changes from 2700K to 6000K, meeting the needs of multiple scenarios:
Office space: Enhance focus with 5000K cool white light and create a meeting atmosphere with 3000K warm light.
Home environment: Before going to bed, adjust the brightness to 10% and 2700K warm light to help sleep, and switch to 50% brightness and 4000K neutral light when reading.
Commercial display: The jewelry cabinet adopts high color rendering (Ra>90) linear lights, which highlight the texture of the goods through infinite dimming.
3. Energy saving and lifespan: balance between efficiency and durability
Infinite dimming reduces energy consumption by adjusting brightness as needed. For example, in corridor lighting, linear lights can be dynamically adjusted to 30% brightness based on pedestrian flow, saving 70% energy compared to fixed brightness mode. Meanwhile, by avoiding the impact of frequent switching on the LED, the lifespan of the lamp can be extended to over 50000 hours.
三, Industry Applications and Case Analysis
1. Commercial space: the combination of light and shadow art and functionality
In high-end shopping malls, infinite dimming linear lights create an immersive shopping experience through embedded installation and dynamic color temperature adjustment. For example, a flagship store of a certain brand uses adjustable linear light strips, highlighting the texture of the fabric through 6000K cold light in the clothing display area, and switching to 3000K warm light in the rest area to create a comfortable atmosphere. Test data shows that this solution increases customer stay time by 40% and sales by 25%.
2. Office scenario: Healthy lighting and efficiency improvement
A certain technology company's office adopts an infinite dimming linear light system, combined with human body sensors to achieve automatic brightness adjustment:
Working hours: Maintain a color temperature of 5000K and a brightness of 70%, ensuring a desktop illumination of 500lx.
Lunch break: Switch to 3000K color temperature and 20% brightness to reduce visual fatigue.
Meeting mode: Use the APP to uniformly dim the brightness to 40% and use it in conjunction with a projector.
After the implementation of the project, the complaint rate for employee headaches decreased by 60% and work efficiency increased by 18%.
3. Industrial sector: Dual guarantee of safety and energy conservation
In the automobile manufacturing workshop, the infinite dimming linear lamp solves the mechanical operation error caused by flicker through high-frequency PWM dimming. For example, after installing linear lights with SVM<0.5 on the assembly line in a certain factory, the accident rate caused by visual interference decreased from 3 to 0 per year. At the same time, the intelligent dimming system dynamically adjusts the brightness according to the natural light intensity, saving up to 120000 kWh of electricity annually.
