In the power supply application, to ensure the stability and the safety of the power supply, peripheral protection circuits are often designed to ensure that the power supply is not damaged during use. Peripheral circuits include surge protection circuit, electrostatic protection circuit, EMI filter circuit, and pulse group anti-interference circuit. This paper will discuss the use and selection methods of MOV applied in surge protection circuits. Ⅰ. What are Metal Oxide Varistors? MOV stands for Metal Oxide Varistors, a voltage-limiting protection device with nonlinear volt-ampere characteristics. It is a matrix structure composed of zinc oxide particles. The grain boundaries between the particles have electrical characteristics similar to bidirectional PN junctions. Application of MOV: MOV is often used in parallel with the protection device to clamp the voltage when the circuit is subjected to overvoltage, absorbing excessive current to protect the subsequent circuit. Main charac...

An important point to consider when choosing a power module is whether to use an isolated or non-isolated power solution. Before proceeding with the discussion, let us first understand the concept of isolated power supply and the main characteristics of isolated and non-isolated power. What is the isolated power supply? The isolated power supply is defined conceptually as the conversion of the voltage through a transformer to realize the isolation between input and output. Then, what are the isolation features? For example, safety isolation, common-mode noise isolation, ground loop elimination, or for occasions with floating ground requirements, are its key features. In addition to isolation, voltage conversion is also one of the important characteristics of power supply, including AC to DC, DC to AC, conversion between high and low voltage, and so on. What is more, with some peripheral devices, it can also stabilize the voltage, so as to protect and filter noise. What are the adva...

Introduction of 305VAC Input 15-150W LMxx-23BxxThe LMxx-23Bxx series of enclosed power supply in MORNSUN 305RAC(reliable under all conditions) family, it can be used not only in the normal operating conditions, but also in applications with higher requirements for input voltage, temperature, humidity, altitude, and electromagnetic interference for long time. The input voltage range is as wide as 85-305VAC, and the power range covers 15-150W. The only 25mm height is more superior to the industry level. At the same time, it has the advantages of isolation voltage as high as 4000VAC, no-load power as low as 0.5W, and efficiency as high as 88%. It adopts a double Y design and meets IEC/EN/UL62368/CCC certification standards. Main Operation Condition of 305VAC Input 15-150W LMxx-23Bxx 1) Voltage Fluctuation The input voltage range is 85-305VAC/100-430VDC, which solves the three major shortcomings of conventional 85-264VAC input products: LM-23B a. The universal input voltage of 85-305VAC...

Production The LMFxx-23Bxx series of enclosed power supply in MORNSUN 305RAC(reliable under all conditions) family, can be used not only in the normal operating conditions, but also in applications with higher requirements for input voltage, temperature, humidity, altitude, and electromagnetic interference for long time. The input voltage range is as wide as 85-305VAC, so it is reliable for long time when the voltage exceeds 264VAC due to power grid fluctuations or some operation conditions such as generators. And the power range covers 100, 150, 200, 320W. At the same time, it has the advantages of isolation voltage as high as 4000VAC and high PF (power factor) of 0.95. It accepts AC or DC input, and meets UL62368, EN62368, CB62368 and GB4943certification standards. Main Challenging Condition: Voltage Fluctuation The input voltage range is 85-305VAC/100-430VDC, which solves the three major shortcomings of conventional 85-264VAC input products: 1,The universal input voltage of 85-305V...

Introduction The LS-R3 series received a warm response from the market since launched because of flexible peripheral design, high reliability, and attractive cost. By refining client’s needs, pursuing comprehensive cost performance, and achieving another breakthrough in dimensions and cost, we are pleased to extend LS10-13BxxR3P series to our "305RAC" family for the applications where voltage accuracy is not strictly required. Advantages 1）Miniaturization and light weightThe dimensions is only 28.84*17.2*14.05mm, and the weight is only 8.2g, which greatly improves the space utilization for customers. 2）Wide input voltage：85 - 305VAC/90-430VDCThis series meets global voltage requirements such as 110/220/277VAC standard voltages; 3）All-rounder periphery The series shoot customer's troubles with the all-matching core design with a flexible peripheral circuit. By adopting different peripheral circuits, the series can be used in almost all applications including low-cost cons...

Introduction Aiming at miniaturization, light weight, non-isolation trend of IoT and smart home applications, MORNSUN launched ultra-light and compact non-isolated AC/DC power supplies with 1~5W in the "305RAC (reliable under all conditions)" family——LSxx-K3BxxSS. The series with 5W is only 16.13 * 15.10 * 9.50mm, and it also features low consumption of 0.1W and high efficiency of 77%. Advantages 1）Miniaturization and light weightThe dimensions is only 16.13 * 15.10 * 9.50mm, and the weight is only 4.5g, which greatly improves the space utilization for customers. 2）Wide input voltage：85 - 305VAC/70-430VDCThis series meets global voltage requirements such as 110/220/277VAC standard voltages; 3）All-round periphery The series shoot customer's troubles with the all-matching core design with a flexible peripheral circuit. By adopting different peripheral circuits, the series can be used in almost all applications including low-cost consumer products and even high-end power ...

As a primary power supply of the user system, AC/DC converter is the cornerstone to ensure the stable and efficient operation of the system. When choosing medium and high power AC/DC, most users prefer to use the mature conventional power supply and often take the cost as the main factor. Medium and high power AC/DC should not only consider the cost but also include thermal design, safety regulations, dimensions, reliability. While MORNSUN ultra-compact AC/DC power supply LOF series balance the above contradictions very well. 1.7W/cm3 power density Our new ultra-compact LOF Series makes them very suitable for applications with space limitation, such as LOF225: 4"×2"×1" (1.7W/cm3), LOF120: 3"×2"×1.2" (1W/cm3), LOF350: 5 "×3"×1" (1.4W/cm3). It can be installed easily with the JST connector. Excellent performance for integration, efficiency and thermal design. Based on our latest circuit topology and adopting digital control, the LOF serie...

The flyback converter in the switching power supply is the most common AC/DC power supply. With the development of integrated circuit technology, most of the circuits in the flyback converter are integrated into the IC, and there are few peripheral components. That makes it possible to build a power supply that has general functions with just adding a suitable transformer. It’s simple but not optimized for personalized and differentiated needs, engineers are always puzzled to balance the design cycle, cost, reliability, ease of use, dimensions, performance, and personalization of power supply. And now, MORNSUN's newest AC/DC Converter "LS-R3" series can resolve this puzzlement. Save Cost from Multi-dimension The cost of the power supply section accounts for a large proportion of the cost of electronic devices, forcing many customers to use discrete solutions to reduce costs. But discrete solutions can only reduce raw material cost, there’re still multiple types of cost ...