Just with some RC components and a switchtransformer , you can make a basic switching power adapter.
The main working principle of the ordinary half-bridge switching power adapter is the switching of the upper and lower bridges (the switch is VMOS when the frequency is high). Turn on, first current flows through the upper bridge switch tube, and uses the storage function of the coil to concentrate the electric energy in the coil and finally close it. The bridge switch tube, the open switch tube of the lower bridge, the inductor coil and the capacitor continue to supply power to the outside. Then turn off the lower bridge switch, then open the upper bridge to let the current enter, and then repeat. Because it is necessary to turn the two switches in turn, it is called a switching power adapter.
As a switching power supply IC in an AC-DC power adapter.
Main advantages of AC/DC switching power adapter:
a: small size and light weight (20% to 30% of volume and weight for linear power adapters),
b: high efficiency (typically 60% to 70%, while linear power adapters only 30% to 40%),
Strong anti-interference, wide output voltage range, modular.
Common low-voltage AC switching power adapter will be 220VAC After being EMI filter, it is directly rectified into an AC voltage of about 300V, and the switch is controlled by the circuit to perform high-speed conduction and cut-off and then converted to high-frequency AC power. The transformer is transformed to produce one or more sets of voltages that are required, and then rectified into AC power of the required voltage.
Converted to high frequency AC The reason for the electric is that the efficiency of the high-frequency AC in the transformer transformer circuit is much higher than 50Hz, so the main transformer can be made very small, and the magnetic core is used, and it is not very hot when it is working. I believe that many people who have used Maojie Power ic know that Maojie's chips cover smart home appliances, mobile phones and tablets, charging & adapters, LED lighting, smart meters, industrial control equipment, etc. AC-DC, DC-DC.Sensor IC, in the field of adapters and chargers, AC-DC's AC-DC has a complete power section of AC/DC switching power supply chip products, providing customers with 5-10W built-in high-voltage start-up and power tube PSR Series, 10-18W built-in high voltage start-up and power tube 55 series, 15-90W external MOS controller series and other architecture products, and provide cost-effective, high performance, stable quality power adjustment system system reference design
As the aC-DC power adapter application industry, the company has been providing a wide range of power adapter solutions for many partners in the past eight years. Collaborators, consumer electronics applications, ups power supplies. Industrial machine electronics applications, tc/pc adapter applications, all kinds of civil / industrial charging, intelligent security equipment, drones power, and remote sensing and control, smart appliances, automotive electronics, automotive electronics, grid circuits , various types of medium and low voltage power grid security equipment and other aspects have important applications,
Maojie Semiconductor is an IC design domestic power IC chip company specializing in pure analog circuits and digital-analog hybrid ICs. The company's senior R&D team will be advanced in the industry. Design technology is combined with the local advantageous industrial chain in the Asia-Pacific region to serve the global market, providing customers with high-efficiency, low-power, low-risk, low-cost, green product solutions and services. Helps chargers, adapters, lighting, Lithium battery charging, sensors, audio amplifiers, small power appliances, and other industries. Maojie Semiconductor's main: domestic AC / DC series power chip, LED chip, lithium battery charging IC chip, sensor application IC chip, audio power amplifier IC and other IC chips, its products have the advantages of excellent performance, high cost performance, good compatibility, etc., and can be compatible with advantages such as Angbao, Jingfeng Mingyuan, Silan Micro, Qida, 矽Lijie, Silicon Power, Saiwei, Weimeng and other brands drive IC chips, and the pin is PIN for PIN, most brand driver ICs are compatible after replacement PCB board Need to make any changes, and test parameters compare other brands There are advantages,Most manufacturers have mass production.
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