| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 96 === The main purpose of the study was to explore a pulsed current charging self-excited circuit system based on Van der Pol`s differential equation. Most of battery charger at past time are taking constant current method, but the concentration polarization of the battery caused by these methods make the energy consumed and battery life decreased. The pulsed current charging method is not constant current form, can restrain battery polarization effectively. The study was to present the charger system in pulsed current form designed including of stability and the nonlinear resistance quality.
The system during negative resistance domain of nonlinear resistance will converge to one stable range, but not run far away this domain. The region conducted the Van der Pol`s equation make the system oscillate converged within the limit cycle, and form a self-excited periodical oscillation. The signals from the design circuit accroding to the concept pass to the switch, and the current from the power supply can inject into the battery in pulse current form. The system compared to the continuing current system is better obrviously in the charging efficiency.
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