Xi'an Xianyang display screen martial arts display screen distributor in Shaanxi

Xianyang display (13572469943) Xi'an, Shaanxi screen display of martial arts display new LED lighting products distributor of a wide variety, but it must be used in common DC power supply and a single device operating voltage is low, the conversion circuit must be used when the use of electricity. For different usage in the technology LED power converters have different solutions. Depending on the supply voltage level, the LED driver can be divided into three categories: First, powered by batteries, mainly used in portable electronic products, drive low-power and medium-power white LED; the second is supply more than 5, the power supply or battery power supply, such as buck, buck-boost DC can be a few (converter; three direct mains (110V or 220V) or the corresponding high-voltage direct current (eg} 40 ~ 400V) power supply, mainly for camel moving power white LED, such as step-down DC / DC converter 1, a battery-powered driving program battery supply voltage is generally 0.8 ~ 1.65V led display for such a low-power lighting device, which is a common usage, this method is mainly used in portable electronic products, drive low-power and medium-power white LED, such as LED flashlight, LED emergency lights, energy saving lamps, etc. Taking into account possible with a 5 batteries work, but also has the smallest volume, and therefore its the best technical solution is the charge pump boost converter, such as the use Boost DC Zhuang (or boost converter (or buck-boost) charge pump converter uses a small number of drive LDO circuit. 2 low voltage power supply program, the driving voltage of senior cadres and program voltage higher than 5 using a dedicated power supply or battery power supply, LED power supply to a voltage value is always higher than the LED voltage drop, which is always greater than 5V, such as 6V, 9V, 12V , 24V or higher. In this case, mainly by power supply or battery power supply for driving the LED lights. This program must solve the power supply problem down, typical applications are solar lawn lights, solar garden lights, 3 lighting system for automobiles, etc., driven directly by the program or high-voltage DC power supply This solution directly by the mains (100V or 220V) or the corresponding high-voltage direct current power supply, mainly for driving high-power white LED lights. City electric drive is a cost-effective LED lighting application power supply, LED lighting is the development direction of universal application. To solve problems with blood pressure and mains rectifier drive LED, but also a relatively high conversion efficiency, smaller volume and low cost. In addition, it should solve the security problem isolation. Taking into account the impact on the grid, but also solve the problem of electromagnetic interference, and power factor for medium and small power LED, the optimum circuit configuration is a single isolated flyback converter for high power applications, you should use the bridge conversion circuit for LED driver, the main challenge is nonlinear led display. This is mainly reflected in the LED's forward voltage with the current and temperature changes, there will be differences between the forward voltage LED devices, LED "color point" will drift with the current and temperature, and LED must work within the scope of regulatory requirements, in order to achieve reliable operation of the main drive .LED role is to limit the current working conditions, regardless of input conditions and forward voltage variation for LED driver circuits, in addition to constant current regulator, there are other key requirements. For example, if the need for LED dimming, the the need to provide PWM technology, but typical for LED dimming PWM frequency is 1 ~ 3kHz. In addition, power handling capability LED driver circuit must be sufficient and powerful, can withstand a variety of fault conditions, and be easy to implement. It is worth mentioning that, due to the LED at the optimum current is not always in the drift. Led display driver in the selection of the program, in the past that there is an inductor step-up DC / DC In recent years, charge pump drives the current output has increased from a few hundred mA to 1.2A with up and down, so that the two Chi actuator type of production almost. (Source: HC LED screen network)