SYSTEMS AND METHODS FOR ADJUSTING INPUT POWER AND/OR OUTPUT POWER OF CHARGING SYSTEMS

System controller and method for changing an input power and/or an output power of a charging system. For example, a system controller for changing an input power of a charging system that is configured to receive an input voltage and charge a device includes: a first controller terminal configured to receive a first voltage indicating a temperature; and a second controller terminal configured to output a second voltage to affect the input power of the charging system; wherein the system controller is further configured to, if the first voltage indicates that the temperature is higher than a temperature threshold: in response to the temperature increasing, decrease the input power of the charging system; and in response to the temperature decreasing, increase the input power of the charging system.