The technology of RFID (Radio Frequency Identification, RFID) as a rapid, real time, accurate information gathering and processing of high technology and information based on standardization, has been recognized as World’s Top Ten key technologies of this century, one in production, logistics, retail, transportation and other miscellaneous industries prospects have wide application. The radio frequency identification technology has gradually become enterprises to improve management of the logistics supply chain, reduce costs, information Management Company, to participate in international economic circuit, strengthening the competitiveness tools and resources needed. IBM ThinkPad R52 battery IBM ThinkPad T40 battery

Based on RFID technology, the logistics supply chain implementation of the management system, requires a variety of RFID read-write device. Handheld RFID reader because of its easy to carry, easy to use features of applications in logistics are a big market. But now on the market for the majority of handheld devices RFID reader, the high energy consumption to extend their working hours, need for high capacity lithium battery power, how to provide a battery lithium fast charge a certain way, it is this need to explore a problem. In this paper, the design to meet RFID combined power DC-DC converter circuit, and the corresponding lithium battery fast charge circuit.

Two step-up circuits

A single voltage lithium battery supply of 3.7 V, the RFID read-write device operating voltage is 5V, so for RFID handhelds need a boost circuit. Dell Latitude D820 battery  Dell Latitude X1 battery

2.1 The basic principle of step-up circuit

Strengthening the principle of the circuit to stimulate the town as shown in literature. The realization of the circuit step-up process work can be divided into two stages: the process of loading and unloading process. The first step is the charging process: When the transistor Q1 turns on, the inductance load, the equivalent circuit shown in Figure 1 (a) as indicated. Power to the load inductor, a diode to prevent the capacitor discharges to the ground. As the input is DC, so inductor current on a certain ratio of the first linear increase in this ratio and the size of the inductor. As the inductor current increases, a large amount of energy stored in the inductor.

The second step is the discharge process: When the transistor Q1 cut-off, discharge the inductor, the equivalent circuit of Figure 2 (b) below. When the transistor Q1 into cutoff by the tower, because of the inductance to maintain the characteristics of current through the inductor will become equal to 0 in an instant, but slowly by the conclusions of the value of the charge becomes 0. The original routes have been disconnected, so that the F3172A PB995A new discharge circuit inductance, which began charging inductor capacitor voltage across the capacitor increases, this time the capacitor voltage can reach higher than the value of input voltage.

2.2 Boost Circuit

Step-up circuit using RichTek Technology RT9266B high efficiency DC-DC step-up chip RT9266B a low quiescent current, conversion efficiency, the external circuit is simple and so on. Chip with control loop adaptive PWM, the error amplifier, comparator and so on, through the circuit of external feedback, the output voltage can be adjusted all the necessary amplitude, with a precision high voltage. Circuit illustrated in Figure 2.

Figure 2 shows the circuit through the external inductor 10uH boost energy storage, using resistors R1 and R2 feedback control circuit output voltage pulse, using internal self-RT9266B VGP-BPS9A/B VGP-BPS9/S PWM Controller NMOS conduction pipe and closed to control the step-up circuit output current. Because the chip PWM controller adaptive, able to adapt to a greater load range.

With the boost circuit boosting polymer 3.7V 2000mAh Li-ion battery to 5V, the ripple of the output voltage is only 40mV, the maximum output current up to 500mA.

3 circuit load

3.1 Li-ion battery charging circuit of the basic principles of

Charging process of lithium can be divided into three stages: pre-load, load at a constant current and constant voltage. When the voltage of the lithium battery is less than the minimum charge voltage, then the first to enter the pre-charging phase, a small current (typically 10% of the current standard) to load the battery until the battery voltage reaches its minimum load voltage. At this stage of pre-charge to prevent over-lithium discharge directly after high-current damage constant load current. When the battery voltage is above the minimum charge voltage, charge in the phase of constant current load. Constant charging current is usually taken as 0.5C (C for the capacity of lithium batteries). When the voltage of the lithium PA3399U-2BAS PA3399U-2BRS battery is up to the standard voltage in constant voltage charging status, charging current is continuously reduced until the current is reduced to 100mA

Figure 2 shows the circuit through the external inductor 10uH boost energy storage, using resistors R1 and R2 feedback control voltage output circuit to stimulate the use of internal self-RT9266B the PWM controller to NMOS conduction pipe and closed to control the step-up circuit output current. Because the chip PWM controller adaptive, able to adapt to a greater load range.

With the boost circuit boosting polymer 3.7V 2000mAh Li-ion battery to 5V, the ripple of the output voltage is only 40mV, the maximum output current up to 500mA.

3 circuit load

3.1 Li-ion battery charging circuit of the basic principles of

Charging process of lithium can be divided into three stages: pre-load, load at a constant current and constant voltage. When the voltage of the lithium battery is less than the minimum charge voltage, then the first to enter the pre-charging phase, a small current (typically taking 10% of the current standard) to charge the battery up ‘that the battery voltage reaches its minimum load voltage. At this stage of pre-charge to prevent over-lithium discharge directly after high-current damage constant load current. When the battery voltage is above the minimum charge voltage, the charger into the charging phase constant current. Constant charging current is usually taken as 0.5C (C for the capacity of lithium A1060 M8403 batteries). When the voltage of the lithium battery is up to the standard voltage in constant voltage charging status, charging current is continuously reduced until the current is reduced to about 100 mA, load finished.

3.2 Li-ion battery charging circuit

Charging the lithium schematic circuit diagram of Figure 3, using the implementation of IT in the bq2057. bq2057 series is an advanced lithium-ion battery charge management IC for a single festival (4.1V or 4.2V) or dual (8.2V or 8.4V) Li-ion and lithium-polymer battery charging needs. BQ2057 can dynamically compensate for the internal resistance of lithium batteries to reduce the load time with optional battery monitoring, temperature, using temperature sensors to detect the battery in the temperature of the battery when the temperature the battery exceeds the target range BQ2057 to charge the battery, the internal integration of the constant voltage constant current device with a high / low side current sensing and a programmable charge current, the identification of state supported by the output of LED light or with the master interface, with automatic re-charge, the minimum charge current termination, low power consumption in sleep, stress and high precision (better than ± 1%) and other functions. Using the external charger circuit design chip is relatively simple and very suitable for compact portable electronics design needs.

The circuit through the NHS with COMP both ends of the DC-side sensing resistor R5 to set the PWM wave output for controlling the frequency of the transistor Q1 turn-on and cut, which would result in the maximum charge current control.

The tour through the actual testing, 3.7V 2000mAh Lithium-polymer BATCL50L  LCBTP03003 battery, a load current up to 810mA, 3 hours for the battery is full. Charging data in Table 1 below:

As can be seen from the table when the load circuit when the show full battery voltage of 4.12V measured with the standard 4.2V voltage difference between the 0.5V. The error reason is that the charging process, lithium battery life of current fluctuations in an instant when the current is below a certain threshold, bq2057 that charging is complete, turn-off circuit load.

4 Conclusions

This paper has developed a battery of the RFID device fast charge circuit, experimental data show that the use of RT9266B and bq2057 designed lithium battery charging and boost circuit to meet the needs of practical applications, and both chips to teach a small package size, the external circuit is simple and very appropriate for the management of portable power.

Innovations author: This paper has developed a battery of the RFID device fast charge circuit, the circuit can quickly use the handset to charge lithium batteries RFID.

Electric vehicle batteries are lead acid batteries, while the waste lead-acid batteries, but hazardous waste. Scrapped Lead acid batteries contain a sulfuric acid solution, there is a large amount of lead. Some electric vehicles, batteries wear out on the treaty as a waste sold regular income people would select their own waste, the battery open, drained the liquid inside. In doing so, is not only dangerous but also pollute the environment.

If we can extend the battery life, but also the equivalent of reducing pollution and make electric vehicles more green. Currently, the county will have a repair shop can be used effectively lead acid batteries, Kan said at a hospital in the battery. “This battery “hospital” batteries restoration project has also received in late November last year, “Tyrone Cup” on the roof of Youth Entrepreneurship Competition design project third prize.

+ Physiotherapy “chemotherapy” comprehensive fix for the PB991A PB992A battery, “longevity”

Ordinary lead-acid battery life of 3-5 years of design, but rarely, under normal use, the battery can be used for 5 years. On the electric car, the battery better Nengcheng three years, the general is bound to two years, poor battery or unreasonable burden, the battery will expire in one year. Some stockpiles too long, do not use the failure discarded. Premature Retirement batteries resources also threaten the safety of the environment.

This is called “Xiao Qiang dealers” and “hospital Battery” People’s Road East, used in physical therapy and chemotherapy, and use the repair method.

Received a “sick” battery, companies first instruments to detect the battery status to show the seriousness of the situation and make a record, then a company “doctor”, then the battery ” diagnosis “to determine which aspects of, and severity of the problem, and finally the right medication. “It’s similar with the doctor of the hospital. Of course, it can not repair the 6Y270  75UYF battery. “Motors boss Wang Qiang, said.

OK there are over 10 types of agent car repairs, for the different battery “problems.” Overall, the car is OK to add the official instrument repair repair with the use of a combination of methods, the use of li contains a repair agent activator can effectively solve the sulfate ” irreversibility “of the cell” sick “.

Dealers’ debris Repair time of the battery, although the machinery and workers compensation are important, but these are the people and the experience is very important. Which tells us the truth about medical treatment? “Concern Shuangyang boss said.

Practice + theory “Mom and Pop” wish to apply for a patent

Xiaoqiang Motors opened in 2006, which was originally taken from elsewhere gives the agent the battery repair repair. “In 2006, 2007, during the repair of the roof to the battery to increase rapidly, we initially thought that this business is a huge market. I remember when the second half of 2007, the county has more than 10 of these shops. But it is estimated that no more than 5. “Qiang said. IBM ThinkPad T40 battery  IBM ThinkPad T41 battery

“We all felt, repair agents, their effect is unstable, for example, compensation for good results in summer, winter, with the same instrument repair and restoration of agents is not a job. Therefore, we have an idea of their own research. “Risk Shuangyang said.

In 2006, Wang Qiang and Yu Shuangyang found a professor at the University of Wuhan, the famous expert drums, Zhen-Tao, thank you to Professor Wang as a teacher to learn the technique of repairing the battery.

In his analysis of technology at the same time, Wang Qiang and Yu Shuangyang also visited Shanghai, Beijing, road and bridge repairs and other sites inspected the battery market. “We found that this market is not mature yet, but it has great potential.” Risk Shuangyang said. Are now commercially available battery can give a lot by adding “Recharge” shop, the couple had taken a bottle of such a filling “” Please identify Professor Wang. Professor Wang does not expect sternly asked them: Will you do things? “This company can do. Professor Wang told them: “Add water” is essentially distilled water, dehydration can be used to treat the batteries are maintenance in nature, but can not be considered fixed. Dell Inspiron 1525 battery  Dell Inspiron 1526 battery

Professor Wang in the special effects used batteries, repair equipment and technology equivalent “, supported by Wang Qiang and Yu Shuangyang explore and we constantly strive to review and continuously improve restoration techniques and features developed for the battery of more than 10 kinds of agent compensation. “As technology continues to improve, we can say that we are here to fix the battery has a certain level. We want to fix our own R & D patent agents.” Risk Shuangyang said. Then, Xiao-car dealerships will be named Xiao Qiang Qiang repair the battery center.

Extensive market ideas or interests to get bank loans Free

In “Tyrone Youth Cup” winners on the roof for the assistance of entrepreneurship, the Tyrone branch of the proposed roof of the bank restoration was completed assessment batteries inspection, decided to give less than 500,000 yuan of interest free loans.

In addition to battery electric vehicle repair, inspection, maintenance outside the shop and Yu Wang Qiang Shuangyang scope will be extended to other areas.

Lead acid A1008 A1012 batteries because of its economic and practical, stable performance, etc., is also widely used in automotive, communications, computers, electricity, finance, aviation and other various industries, such as emergency lamps, miner’s lamp, UPS (uninterruptible power supply, banks, schools and other large tended to be) all lead-acid battery is available. Therefore, this “hospital” battery “patient” is not limited to electric vehicle batteries, Tongbai Pumped-storage power station of the equipment, the power sector, miner’s lamp, high schools, UPS , battery electric vehicles are the “batteries Hospital” to serve. “We will use bank loans to buy a big machine to improve the efficiency of repair of high-power batteries to improve performance.” Risk Shuangyang said.

According to its introduction, repair, electric bicycles, electric bike batteries replaced with new batteries will cost about one fifth of the warranty after the repair at 7 months. Prices for battery electric cars in 5000-8500, all news will be very expensive repair if you do the battery much cheaper.

If the batteries can not be repaired, the “hospital of the battery” may be responsible for recycling, will be sent to coastal batteries there is a recycling of used lead acid battery recycling qualification processing plant.