Time： 2019-12-31 17:21:17
USB charger is mainly to connect the mobile phone to the USB port of the computer, which provides power and is full of creativity. Its charger structure is very simple, there is no large transformer, the style and data line are the same, much lighter than the original charger.
Nowadays, many MP3, mobile phones, etc. are equipped with USB chargers. The data line is used as the power line, which is inserted into the computer to automatically start charging. At the same time, it is equipped with a transformer, and the output port is USB interface, which can charge all electrical appliances of the standard socket: for example, MP3 charger can charge mobile phones, which greatly facilitates people's life. This paper introduces the design of several USB chargers, as well as the solutions to the technical problems of charging with USB.
USB charging solution: efficient AC adapter
USB charging solutions for consumer devices are attracting more and more attention. Universal standard for 10W to 25W chargers with multiple USB interfaces, which can power a variety of devices without having to equip each new electronic device with a new wall charger. We need to use some efficient AC / DC converters to meet the continuous development of high-density small-scale adaptation. For example, ucc24610 "green rectifier" and other devices can help improve the efficiency of AC / DC converter and realize the design of high-density USB charger.
USB charger manufacturing steps
In this paper, a USB charger circuit is designed, and the schematic diagram is drawn. This circuit is not complicated and has the function of over current, overload and short circuit protection. Low failure rate, not easy to damage.
Green challenge of mobile USB charging
Mobile phone charger has a great impact on the environment. The mobile phone industry has begun to use universal charging solution (UCS) to solve this problem, which will change the way mobile phone manufacturers design mobile phones. This paper will analyze the factors that need to be considered to realize the safe charging interface.
USB charging and over-voltage protection solutions for Chinese standard mobile phones
The standard "YD / T 1591-2006 mobile communication handset and interface technical requirements and test methods" enforced by the Ministry of information industry of China puts forward corresponding requirements for both the mobile phone side and the charger side. This paper focuses on the charging solution and over-voltage protection solution of the mobile phone side charging circuit.
Data line protection scheme for micro USB port of smart phone
At present, the mainstream mobile phone charger in the market has changed from 500mA ~ 700mA charging current to 1a ~ 2A charging current. With the increase of charging current, the contact reliability of micro USB port is higher. The security protection of micro USB port of smart phone has also become an urgent task for many manufacturers. This paper introduces the scheme of effective temperature protection by using polymer positive temperature coefficient recoverable resistor installed in micro USB data line.
Ncv8852 for vehicle USB power supply (I)
Ncv8852 (2) for vehicle USB power supply
With the popularity of portable devices with large battery capacity, as the USB power supply of vehicle charging interface, more current needs to be increased to meet the needs of the equipment. Considering the reverse polarity protection and line loss, the input voltage of USB power supply will be lower. This is a challenge for the design of USB power supply. This paper introduces the solution of this problem by using buck circuit.
Efficient dual track power supply from USB
The circuit described in this paper was originally used in the design of a thermoluminescence (TL) instrument. The microcontroller, USB interface controller and 10 operational amplifiers in the design are used as small power devices to obtain all power from one USB port. The operation of the equipment requires high performance and low noise pickup, so that the RF radiation of the system is as low as possible. Before the circuit is built, it has been simulated and verified, and then used in TL system. The attraction of this design is that it adopts common components, which improves the repeatability and reduces the cost.
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