The voltage converter, also called a power converter or voltage inverter is an electrical or electromechanical device that supplies devices whose current-voltage parameters does not allow a direct connection to the receiver. The task of the power converter is a change in the current and voltage in a way which meets the requirements of the powered receiver with the smallest possible power losses. Low power losses are synonymous with high efficiency converter.
Power converters are used both in systems that require the introduction of significant differences between the voltages (and thus multiple increases or decreases in voltage) and when the receiver requires a certain value of the supply voltage, which can not be provided by the used power source, for example, discharging of the battery cells. The task of the power converter can also be to change the frequency of alternating current, or change of dc to ac or vice versa.