Voltage Regulators are the electronic devices that regulate or control the voltage of sources of power within the acceptable limits. They helps in keeping the voltage of any equipment within the specified limit that can be accepted by the electrical equipment. The Voltage Regulators have numerous applications in all type of motor vehicles to match the electrical load with the output voltage of their generator and also to their battery charging requirements. These regulators are also widely used in those electrical equipments where excessive voltage variations are found.