Guo Yifeng

Study on the fast charging method of lead-acid battery with negative pulse discharge

In order to improve electric vehicle lead-acid battery charging speed, analysis the feasibility of shortening the charging time used the charge method with negative pulse discharge, presenting the negative pulse parameters determined method for the fast charging with pulse discharge, determined the negative pulse amplitude and negative pulse duration in the pulse charge with negative pulse. Experiments show that the determined parameters with this method has some Advantages such as short charging time, small temperature rise etc, and the method of negative pulse parameters determined can used for different capacity of lead-acid batteries.

Notice of Retraction The Charging Technology for Lead-Acid Battery with a Negative Pulse

For the problem of lead-acid battery charging for a long time, analyzing the causes, discusses the principle of the negative pulse charging based on fuzzy control, made the specific system circuits; shows the simulation and testing results of the system; the results show that the system for improving the lead-acid battery charging time is feasible and effective.

Study on the method of fuzzy PID control for DC/DC converter

Article proposed a control method of predictive fuzzy PID for DC/DC converter based on the topology of zero-voltage zero-current switching PWM full-bridge converter whichs control chip is 9212dp256. The method is fully compensated digital control system to control delays, greatly saving resources of digital controller. Final results show that the method is a good control, and its control performance is achieved the desired specifications.

Notice of Retraction The Low-Power Design for Handheld RFID Readers

According to meet the requirement of the low power consumption in the handheld RFID reader, it is introduced that a design strategy of power consumption and a scheme of component selection in the design of an handheld RFID reader based on the MSP430F149 MCU, and a method, when combined with the working status of the RFID reader, is proposed to reduce the power consumption through adjusting the clock frequency of MSP430F149 MCU and intelligent managements of system working mode. Test results indicate that the method is useful to reduce the system power consumption.