LED panel light drive power supply and its development history

LED panel light is the first commercial and mature LED luminaire in the strict sense. Its structure and optical characteristics are based on LED technology, and it is a good product that meets lighting needs with a new design.

Since its inception, ultra-thin structure, ultra-high light efficiency, low light decay, and long life have become the research and development direction of the technical teams of various LED panel light manufacturers. From the perspective of driving power, LED panel light has roughly gone through the following development periods. Interested partners may wish to spend a few minutes with Xinjielighting to see the development of LED panel light drive power.

1 LED panel light constant current power supply

For LED panel light, the traditional grille light housing was used at first, and the T8 lamp tube assembly was replaced by the LED light board to make the direct lighting. The driving power is mostly built-in constant current power supply.

2 LED panel light constant voltage external power supply

Drawing on the mobile phone backlight scheme, using a new design of aluminum profile + light guide plate + side lighting structure, LED panel light in the true sense was born. At this stage, the driving power supply mostly adopts constant voltage external power supply, mainly the existing adapter power supply (the PF value of the adapter power supply below 75W is not required, generally around 0.5).

The constant voltage adapter power supply is used as the power supply for the LED panel light (the purpose of constant current is achieved through the chip resistor on the LED light board), one is for the convenience of procurement and subsequent maintenance, and the other is that this stage has not yet It matches the mature LED constant current power supply.

3 LED constant current drive power supply

Since 2012, with the expansion of the market share and the improvement of the luminous flux of lamp beads, for the consideration of LED life and luminous efficiency, LED constant current drive power is more widely used in LED panel light. Endows LED panel light with more product attributes and value.

Basic concept of LED driver power supply

First of all, we clarify some basic concepts of LED driving power.

What is PFC?

In general, PFC is power factor correction. Through the PFC circuit, the harmonic pollution of electrical appliances to the public power grid can be reduced. For the needs of energy saving and emission reduction, to show the health and friendliness of LED lighting products, most of the certified products around the world put forward clear requirements for the PF of LED drivers.

What is strobe?

The stroboscopic and stroboscopic effects are two mutually causal physical quantities for the electric light source, the fluctuation depth of the luminous flux and the resulting harmful effect (called the stroboscopic effect). Flicker refers to the depth of fluctuations in the luminous flux of an electric light source. The greater the luminous flux fluctuation depth, the more serious the stroboscopic. The fluctuation depth of the luminous flux of the electric light source is directly related to the technical solution of the electric light source.

How to test strobe?

Human eyes are not sensitive to flicker above 60Hz, and the output frequency of LED constant current power supply is generally 100Hz and above. The test method of sampling LED lighting with CCD photosensitive imaging (mobile phone, camera) is not necessarily accurate, but it is a simple test method.

The traditional test method is: rotating the black and white gyroscope under sunlight, the pattern will form a stable ring, and the color ring will not change with the rotation speed and rotation direction. Under the tested light, turn the black and white gyroscope to observe the phenomenon: if the color of the pattern or the ring structure changes, it means that the light has stroboscopic, and the more obvious the change, the more severe the stroboscopic. But there is no way to make an accurate judgment on the depth of the strobe.

The most scientific test method is to use the Light Flickering Analyzer, the core of which is an ultra-fast photometer with a sampling frequency of 10kS/s (10,000 tests per second).

Scan the luminous curve of the luminous object (similar to an oscilloscope), and calculate the parameters such as the flicker index to obtain the fluctuation depth of the light (optical ripple coefficient).

What volatility depth is acceptable?

The need for no stroboscopic is developed in response to the needs of the market. At present, there are clear technical requirements in the US regulations, but most markets do not have a unified standard to strictly require the stroboscopic depth of the light source. At present, some customers require fluctuation depth <8%, some require <5%, and some require <1%.

Through the introduction of the above content, I believe that everyone has some understanding of the driving power supply of LED panel light and its development history. I hope that the content brought to you by LED panel light supplier Xinjielighting today will be helpful to you. More LED panel light related For information please click below:

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