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.
Figure 1 Led display basic architecture
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.
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
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!
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.
12V
Dc Motor Can drive under the rated voltage 12 v dc motor, most of the products our company can achieve the 12 v voltage drive, speed can be customized according to customer demand.
Characteristics: 12V dc
motor With torque, low noise, small size, light weight, easy to use, constant speed operation, etc, also can match all kinds of reducer in order to achieve the purpose of changing the output speed and torque
Application field: 12V Dc Motor part of the armature iron core, armature, commutator and other devices, dc motor is suitable for most of the electronic products, such as electric toothbrush, razor, medical apparatus and instruments, breeze machine, mixer, etc
Method of use: the best stable in horizontal plane, installed on the 12V Dc Motor output shaft parts, cannot use a hammer to knock, knock prone to press into the 12V dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
12V dc motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a 12V dc motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
12V dc motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of geared motors is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
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