Architectural lighting usually involves a variety of digital tube lamps, including LED light strips commonly used for contour lighting, LED digital tubes; LED floodlights, floodlights, xenon lamps, wall washers commonly used for wall lighting; Architectural design of LED corrugated lamps; square pools, fountains for underwater lights; buried lights, lawn lights; and various indoor lighting and so on. Under the premise that governments around the world strongly advocate green buildings, the energy-saving advantages brought by LED lighting are receiving more and more attention, and the application ratio is increasing significantly. On the other hand, an urgent problem facing LED architectural lighting is: how to get rid of It is simply a simple design process such as light hooking and beating, but the LED lighting and artistic creativity are perfectly integrated. This not only requires lighting designers to further master the technical characteristics of LEDs; it also requires manufacturers from different industries in the LED industry chain to work together to provide higher quality products and technologies to support them according to specific market needs.

How to measure the digital tube pins, the total yin and the common yang?

Looking for public sympathy and public yang: First, we find a power supply (3 to 5 volts) and a 1K (several hundred ohms) resistor, VCC connected to a resistor and GND connected to any 2 feet There are a lot of combinations, but there is always one LED that will illuminate. Finding one is enough, then GND does not move, VCC (string resistance) touches the remaining feet one by one, if there are multiple LEDs (generally 8), Then it is the common shade. Instead, use VCC to move, GND touches the remaining feet one by one. If there are multiple LEDs (usually 8), then it is common. Instead, use VCC to move, GND touches the remaining feet one by one. If there are multiple LEDs (generally 8), then it is common. You can also use a digital multimeter directly. The red pen is the positive pole of the power supply, and the black test pen is the negative pole of the power supply.

And non-constant current drive on the digital tube

1, display effect:

Since the light-emitting diode is basically a current-sensitive device, its forward voltage drop is highly dispersive and also related to temperature. In order to ensure good brightness uniformity of the digital tube, it is necessary to have a constant operating current, and cannot Affected by temperature and other factors. In addition, when the temperature changes, the driver chip must be able to automatically adjust the output current to achieve color difference balance temperature compensation.

2. Security:

Even a short-time current overload can cause permanent damage to the LED. After using the constant-current drive circuit, it can prevent large-scale damage of the digital tube caused by current failure. In addition, the VLSI we use also has a cascaded delay switching feature that prevents damage to the LED from reverse spike voltages. Very large scale integrated circuits also have thermal protection that automatically shuts off when the temperature of any piece exceeds a certain value, and can see the fault display in the control room.

The question of brightness consistency is a common problem in the industry.

There are two big factors that affect brightness consistency.

One is to use the selection of raw material chips, and the other is to control the way when using digital tubes.

1. Raw materials - The VF and brightness and wavelength of the chip are a normal distribution. Even if the chip is screened, the VF and brightness and wavelength are already in a small range. The produced product is still in a range, and the result is brightness. Inconsistent.

　　2, to ensure the same brightness of the digital tube, there are differences in the choice of control methods The best way is constant current control, the current flowing through each LED is the same, so the LED looks the same brightness. For example, the constant voltage control causes the currents of the LEDs with different VFs to be different, so the brightness is also different.