PLL-based battery charge circuit topology

In this paper, a phase-locked battery charger (PLBC) is proposed to show that a phase-locked loop (PLL) is a perfect circuit topology for battery charging. The circuit topology of the PLBC is almost the same as that of the PLL and it inherits the merits of the PLL, such as autotracking, autolocking, and high accuracy. A complete charging process, consisting of three subprocesses: constant current charge, variable current charge, and float charge, can be automatically implemented by using the above inherent characteristics of the PLL. Experimental results show that the PLL is really suitable for carrying out a battery charge controller.