Power Bank, also known as charging treasure, travel charger and so on. A set of power supply and charging functions in one of the portable charger, you can give mobile phones, tablet PCs and other digital devices anytime, anywhere charge. Generally by the lithium batteries (or dry batteries, less common) as a storage unit, easy to use.
The core technology of Power Bank is to give the phone when the discharge current and voltage curve is smooth, it is related to whether it will damage the charging equipment, an important technical indicators, the discharge curve test must look at the third party authority test report.
For Power Bank, it has a certain emergency function, in a large number of digital power supply can not be stored in the case, you can power through some devices, so that digital products to achieve the normal work results. Such as the market appears solar Power Bank, hand-cranked Power Bank, intelligent machine backup power.
Power Bank technology refers to the product design into the consumer's public or minority aesthetic. As a portable and has a certain function of electronic products, consumers pay attention to the appearance of its aesthetics, so the mainstream manufacturers not only increase the battery power management technology innovation, but also increase in line with the aesthetic appearance of consumer product development The
Function expansion circuit
Functional expansion covers the common needs of outdoor activities, with emergency night lighting, outdoor security alarm, camping mosquito repellent.
Internal is divided into four kinds: traditional separation, software triple, hardware triple, synchronous rectification, software triple synchronous rectification.
Traditional separation is MCU, charge management, DC-DC separation, 1A efficiency 88%, the advantage is already widely accepted by the market. The most serious problem is the 2A output case, the efficiency is low (83%), PCB fever is very serious.
Software triple-MCU plus external MOS, synchronous rectification, 1A efficiency of about 91%.
Hardware triple is achieved through hardware, software can not be modified. 1A efficiency of about 86%. The problem is that non-synchronous rectification, low efficiency, 2A output when the heat is serious.
Synchronous rectification is 1A efficiency up to 93%, 2A efficiency up to 88%. The biggest advantage is that small size, low fever. The disadvantage is that synchronous rectification of DC-DC chips is too high.
Software triple synchronous rectification, 1A efficiency up to 95%, 2A up to 90%, can be charged and discharged high efficiency does not heat, low cost performance. The disadvantage is the need for strong software + hardware technology design.