There are also many types of switching power supply control chips, which are mainly divided into two categories: current control type and voltage control type. The voltage control type only samples the output voltage, as a reaction signal to stop the closed-loop control, and uses PWM technology to adjust the output voltage. From the perspective of control theory, this is a single-loop control system. The current control type is based on the voltage control type, adding a current negative reaction link, making it a double loop control system, thereby improving the performance of the power supply.
In terms of product classification, it can be roughly divided into two categories: AD/DC and DC/DC. Over the years, the development of product application technology has formed a certain misunderstanding of the industry's understanding of DC/DC power supplies, thinking that DC/DC is difficult to do, and AC/DC is easy to do.
Even so, AC/DC and DC/DC are still very different. From the perspective of product design, device selection requirements, and reliability objectives: AC/DC is far more complicated than DC/DC and difficult to do. This is many years. Engaged in the research and development of AC/DC power supply, and has a deep understanding of consumption.
First of all, from the input side comparison, AC/DC is far more difficult to do than DC/DC. Because AC/DC is directly connected to the public network, it is well known that the public network is very complicated. Some municipal electricity is directly small hydropower, which can be as high as 350VAC at night; some are connected to the wrong phase line and the direct voltage is 380VAC, and low voltage can reach Below 130 volts. In addition, there are many devices with different input characteristics connected to the public network. There are rational loads and capacitive loads. There are many spikes and noises on the power grid, and multiple harmonic components, lightning induced by thunderstorms and other factors. The combined influence makes the public network more complicated. The input voltage of DC/DC usually comes from a rectifier or a battery. There are four commonly used voltages: 12V/24V/48V/60V. The rectifier is AC/DC, which has been isolated once.
Secondly, from the perspective of device selection and reliability, AC/DC design is more difficult than DC/DC. From the above description, AC/DC is directly facing high voltage. The choice of input devices, especially power MOSFETs, the higher the voltage, the greater the conduction voltage drop and the switching loss, and the more difficult it is to meet the thermal design of the power supply. Other diodes, The triode also has the same problem, high pressure is difficult to choose, low pressure is better. At the same time, the safety level of AC/DC power supply requirements is much higher than that of DC/DC. In terms of circuit structure, AC/DC generally requires two-stage conversion, while DC/DC only needs one-stage conversion, and the main power conversion circuit used by DC/DC is relatively simple in comparison.
Switching power supply chip modelThere are many models of power-off thick die chips, so here are a few examples: STR456A, STR5412, STR6020S, STR6601, STR-F6454, STR-F66600, STR-F6707, STR-G5653, STR-S6309, STR-S6708, STR- S6709 and so on.
The most common is the 384x series, the older power supplies, 494/7500 are also more common.
The self-developed power supply series of elanpo UnionPay Electronic Technology Co., Ltd. has been widely recognized. It has considerable advantages in the power market competition and has a large number of applications in the market. The advantage of elanpo UnionPay in the domestic market depends on the high-efficiency, low-power, low-price, safe and stable single-chip switching power supply series. There are multiple unique series on the power chip, and nearly a hundred models of products are circulating in the market. And it has close cooperation with well-known domestic companies such as Huawei, TCL, Midea, ZTE, Saiwei, PFC, MEAN WELL Electronics, etc. Among the commonly used switching power supply chips, typical products such as: TB6806 and TB6818 are successfully applied. Power solutions of major manufacturers
The commonly used switching power supply chip TB6806 has an efficiency that meets the six-level energy efficiency requirements. It is a multi-mode (Multi-Mode) controlled high-precision primary side feedback control (PSR) constant current and constant voltage (CC/CV) controller. This chip has built-in power MOS, uses SOP/DIP-8 package, minimizes the number of system components, and uses frequency modulation to improve system efficiency and reduce electromagnetic interference. Built-in loop compensation can save additional compensation or filter capacitors, and also built-in cable voltage drop compensation, thereby achieving good load regulation. Now it is widely used in charger adapter power supply manufacturers. 
TB6806 and TB6818
The efficiency meets the six-level energy efficiency requirements. Low standby power consumption is less than 70mW. Primary-side feedback, built-in 600V power MOSFET QR-PSR control improves work efficiency ±4% constant voltage and constant current accuracy, multi-mode PSR control
Built-in soft start, ultra-low start current, pin floating protection,
Intelligent short-circuit protection technology, which can realize short-circuit protection even when the leakage inductance is large and the VDD voltage is high
Common chip selection1. DC-DC power converter
Low-power switching DC-DC power converter uses ADP3000 chip; step-up dc-dc power converter uses LM2703 chip; low-noise 1A step-down DC-DC power converter uses MAX1684 chip
Two, linear regulator
The HIP5600 chip is used for the high-voltage linear regulator; the MC33998 chip is used for the regulator with a linear regulator
Three, AC-DC controller and converter
PWM switching power supply controller uses FAN7556 chip; step-down monolithic AC-DC converter uses HV-2405E chip; high-power thick film power switching power converter STR-F6654 chip
Switching power supply chip selection considerationsFirst: performance. We have selected the IC to be used in the product, and the product is to be certified. From the perspective of business survival, products must be approved by customers, so performance must be put in place. However, it is impossible to see the performance of a chip at a glance. We can use the following three ways to judge its performance:
1. Look at the products of the peers: If the peers have success, use cases, of course, there is no problem, because no one is stupid enough to use their own products to serve the promoters. If this is used in a product of a peer (for example, a larger one), there is probably no problem, but this is not easy to follow, because you can't easily see the core technology of the peer, and What the promoters say, you won't completely believe it.
2. Engineer recommendation: In the past when communication was extremely inconvenient, we could only rely on books when we encountered technical problems. And now with the development of the Internet, communication has become extremely convenient. The big coffees in the major forums have successful experiences and are happy to help you. So in this case, we have to see if the peers have practical application experience, such as test results, etc.
Second: cost performance, that is, the match between price and performance. It is not easy for us to develop something, and now the economy is in crisis. If the cost is too high, our company cannot survive. Heavy is the light of the economic crisis, which will let us find a way out! Therefore, the price-performance ratio must be considered. It is also necessary to shop around here, because our line is still based on peer-to-peer dumping, and the quotations of different people will be very different. So when you come across a good movie, don’t cancel it just because the family tells you a high price. (That will increase our labor!) In this regard, my advice to everyone is: Go online and search, because the main thing is to do The distributors of the film will have a certain network advantage.
Today let`s talk about touch screen laptop. Sometimes people take Yoga Laptop or 2 In 1 Laptop or 360 Laptop as foldable touch screen laptop. Cause the later ones usually with touch screen function. The difference is that touch screen laptop specials can`t be flipped up to 360 degree, usually 180 degree. Do you think which kind of person love 2 in 1 touch screen laptop more? Business people is the right answer, cause they care more performance, touch screen function, 180 rotating, which are the very important points for businessman, especially teaching in person, do presentation, etc.
Do you think what other business laptop businessman love also except touch screen laptop under 20000? 14 inch 11th Laptop and 15.6inch 11th or 10th Laptop should be the top levels.
As a professional manufacturer, also customizing Android Tablet, Mini PC , and all in one except laptop. So believe you can always get the most competitive one at this store, balancing the quality and cost at top.
Any other special demand, you can just contact us freely. Will try our best to back you up.
Touch Screen Laptop,Touch Screen Laptop Specials,Touch Screen Laptop Under 20000,Foldable Touch Screen Laptop,2 In 1 Touch Screen Laptop
Henan Shuyi Electronics Co., Ltd. , https://www.shuyicustomtablet.com