The handheld POS machine is a multi-function terminal. It can be installed in the special merchants and acceptance outlets of credit cards to connect to the computer to form a network to realize the automatic transfer of electronic funds. It has the functions of supporting consumption, pre-authorization, balance inquiry, and transfer, etc., It is safe, fast, and reliable to use. It is difficult to obtain basic operating information in large transactions, and the introduction of POS systems is mainly to solve the blind spots of information management in the retail industry. An important part of the chain store management information system.
1. POS machine smart lithium battery design requirements:
According to customer requirements and specifications, design the POS machine smart battery pack that is matched with the host, and integrate the smart fuel gauge with communication protocol, lithium battery, and safety protection performance into the solution, which can reach the smart lithium battery pack and the POS machine host Information sharing, and finally realize a reasonable, efficient and safe battery management plan. In the design process of the whole scheme, the direction is to achieve the most perfect integration with the host, to ensure the safety of the battery, battery pack, and the entire system, and to meet the corresponding design regulations and certification regulations as the first consideration. At the same time, in order to ensure the safety and reliability of the lithium battery, multilayer protection must be adopted inside the battery pack to prevent the lithium battery from being damaged due to overcharge, over-discharge or short circuit.
2. POS machine smart lithium battery design scheme:
1) Protection Board (PCM): Mainly a protection circuit designed for rechargeable smart battery packs. Due to the chemical characteristics of the lithium battery itself, it needs to provide smart power calculation, overcharge, over-discharge, short circuit, overcurrent, and overtemperature, etc. Protective function. In order to avoid dangers such as burning and explosion.
2) Protection IC (Protection IC): The main protection function chip of the design scheme, which performs online monitoring of overcharge, over-discharge, overcurrent, short circuit, and other functions of the cell. Make the batteries work in a safe, stable, and efficient range.
3) Overcurrent protection chip (PTC): Mainly designed for secondary protection function. The PTC recoverable fuse has the dual function of overcurrent protection and automatic recovery. The PTC in battery products can prevent the occurrence of battery high-temperature discharge and unsafe high current. 4) 103450 Li-ion cell/103450 Li-ion cell (SANYO).
5) Field-effect tube (MOSFET): MOSFET, which acts as a switch in the protection circuit, will always keep the voltage at both ends of the load from increasing or decreasing, ensuring voltage stability.
6) Power management control chip (BQ26500): a fully functional power meter, with an analog-to-digital converter (ADC) for measuring voltage and temperature and an analog-to-digital converter for measuring current and charging sensing. The power meter has a microprocessor, which is responsible for executing the power meter and can provide information such as the remaining power state (Remaining State of Capacity), and the BQ26500 product also provides the remaining run time (Run Time to Empty). The host can query this information with the fuel gauge at any time, and notify the user of the battery information. The power meter is very convenient to use. Allow users to keep track of battery power at any time.
7) Battery pack packaging: plastic shell.
8) Schematic diagram of POS machine smart battery design scheme:
3. POS machine smart lithium battery product realization diagram:
