Uninterrupted power supply of telecommunication equipment is the basic and inseparable pillar of telecommunication centers. In order to provide an uninterrupted power supply, UPS devices have been produced and entered the market. When the electricity in the city is cut off, the electrical devices in the residential and office environments will stop working. This problem can be solved by using a UPS. Every UPS has two sources of energy, the primary source of energy or the city electricity and the second source which is known as the secondary source is the same battery in the UPS that enters the circuit when the city electricity is cut off. In telecommunication equipment, it is better to prepare UPSs that have a wide range of input voltage, because this increases the battery life. If the UPS has high energy efficiency, this will reduce the wastage of electrical energy and save the costs of consumers.