The concept of energy-saving LED display has quietly risen, becoming the highlight of its most attractive to consumers, and it is also the reason for the rapid growth in recent years. Of course, after years of mad growth, the industry is now in a stalemate to reshuffle. In this dilemma, there are bound to be many enterprises that have been affected by this and have been badly hurt, and even went bankrupt. Of course, many enterprises will go out of their haze and gain more long-term development. This is the law of development of the industry. Any enterprise can't escape this disaster. How to regenerate in the disaster is a problem that every enterprise is currently paying attention to. In this era of high energy-saving calls, the further energy-saving of led display has become a support point for this industry. Many companies have made improvements in various aspects at this point, and have improved to a certain extent, achieving energy-saving effects, but there is still a long way to go to achieve greater energy conservation, which requires the common industry Work hard. Figure 2 CYT62726 driver led small module To reduce the power supply to red 2.8V, green 3.8V, blue 3.8V, we can save the 1V*Iled power consumption on the IC channel, and the LED display can be saved without changing other devices. At least 15% or more, plus the reduction of the cooling requirements of the LED screen can also achieve a certain degree of energy saving, which is already a considerable number for a large screen, I believe customers will be happy to accept!
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Figure 1 Led display basic architecture
Recently, there have been a few energy-saving LED display screens on the market. Through the improvement of the power supply, the energy-saving effect of the LED display has been greatly improved, attracting the attention of many consumers and giving a very high expectation. Many LED display manufacturers are eager to try, and are ready to introduce this technology first, and gain the opportunity to develop. Based on the current technology, how is the energy-saving effect of the energy-saving LED display achieved?
We use a small LED module to analyze its power consumption! As shown in Figure 2, it is a small LED module with CYT62726 as the driver chip introduced by Changyuntong Optoelectronics. Its power supply voltage is 5V. The power consumption of peripheral devices is not calculated first because they account for a very small proportion in the whole screen. The power consumed by the entire screen is on the lamp. First calculate the power of the lamp point as Pled=n*Uvf*Iled (n is the number of channels, Uvf is the voltage drop of the LED lamp point, Iled is the set current value) CYT62726 driver IC The voltage drop of the pin is generally about 0.6V, and the voltage drop of the red, green and blue lamp points is 1.8V, 3.0V, 3.0V, so that each channel only needs 4V (3.0+0.6V) to work normally, conservatively. Can be set to 2.8V red channel, blue and green channel 3.8V and actually our supply voltage is 5V, which is equivalent to increase the power consumption of 1V * Iled inside the IC, so as can be imagined only 
We can further analyze the principle of energy saving!
First of all, from the perspective of power supply, Figure 3 is a schematic diagram of a traditional switching power supply. If 5V is to be reduced to 4V, the forward voltage drop of the rectified Schottky will increase the proportion of the output voltage, and the output voltage of the switching power supply will be lower. The higher the specific gravity of the rectified Schottky forward voltage (its specific gravity X=V voltage drop/V output, the output is reduced from 5V to 4V, and the voltage drop is 0.5V, the specific gravity will increase from 0.1 to 0.125, 25%), the lower the power output efficiency, which is not obvious for the overall energy saving effect of the LED screen. Therefore, the power supply design principle is obviously unable to achieve the improvement of the power supply efficiency. At the same time, 5V is the nominal voltage, which is quite mature in the market. The new switching power supply voltage is enabled, which reduces the efficiency and increases the cost. The quality is difficult to guarantee and the implementation is difficult.
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The design of the power supply is a relatively mature field, and another design idea can be used to realize the power supply of the display screen, such as synchronous rectification technology. The basic principle is shown in Figure 4. Q10 is a power MOSFET. In the positive half cycle of the secondary voltage, Q10 is turned on, and Q10 is rectified. In the negative half cycle of the secondary voltage, Q10 is turned off, and the power loss of the synchronous rectifier circuit mainly includes Q10. Conduction loss and gate drive loss. When the switching frequency is lower than 60KHz, the conduction loss is dominant; when the switching frequency is higher than 60KHz, the gate driving loss is dominant. When driving a higher power synchronous rectifier, a CMOS high speed power MOSFET driver can also be used when the gate peak drive current IG(PK) ≥ 1A is required. Synchronous rectification instead of Schottky rectification can effectively reduce the proportion of consumption in the output power. The use of synchronous rectification technology is a must. 
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