Abstract: An intelligent voltage and current controlled PWM microcontroller type battery charger includes an electromagnetic interference filter, a bridge rectifier, a transformer and a switching power supply of a rectifier as a main structure and operates with a microcontroller unit of a PWM controller for charging various chargeable batteries. The microcontroller unit operated with a battery charging protection block include a battery charging loop circuit connected to two PWM controllers for modulating outputs if constant voltage values and constant current values to control a feedback of the switching power supply. A current detection block, a voltage detection block and a temperature protection block are operated with the microcontroller unit. A battery charging protection block and a delay startup battery charging protection system are connected to the microcontroller unit. The invention can achieve the effects of charging different types of batteries, saving energy, reducing carbon and protecting environment.