What are the LLVD and BLVD in the switching power supply?
Distribution of the AC power into the switching power supply, after rectification, transformer output -48 volts, while the battery pack float, are charged operation. When the mains input interrupt, the battery pack began to discharge, to access the switching power supply load such as base station equipment (BTS), transmission equipment (Guangduan Ji), to ensure the normal operation of the base station. When the battery voltage drops to the switching power supply set a voltage, the switching power supply off the power terminal connected to a non-critical business load; battery continues to discharge, to the second power supply terminal above the important business load , When the battery voltage drops to the second voltage, the switching power supply to cut off all the load to protect the battery pack will not appear over discharge phenomenon, over discharge on the battery is fatal, and is irreversible, will cause the whole group of batteries scrapped , But tens of thousands of dollars it
????Generally the base station equipment (BTS) access to a power, the transmission equipment (Optical) and other access to the second power.
Once, the second power supply voltage settings are in the switching power supply, the specific parameters according to the battery capacity, battery life, load power and other parameters set.
Simply said that a power and the second power is the main circuit and the control circuit, respectively, in the mobile base station, the popular point that a power out of the equipment in addition to the transmission equipment are stopped to ensure that other Station to connect the station to transfer the station to work properly, the second power is to protect the battery and power failure, then all the equipment are stopped.
(LLVD) a power down;
????(BLVD) secondary power;
The so-called power, the second power is on the switching power supply (power cabinet) said.
Often, the electrical equipment of the power plant and substation is divided into two main categories: equipment and secondary equipment. A device: refers to the direct use of electrical equipment for the production, transmission and distribution of electricity, through the completion of these equipment to produce electricity and power to the user's task. By a certain device connected according to a certain law for the completion of the power of the hair, change, lose, with the task of the composition of the circuit, known as the electrical main wiring, also known as a circuit or a system. Secondary equipment: refers to the work of a device to monitor, measure, operate and control equipment. The circuit that represents the secondary device interconnection relationship is called secondary wiring, also called secondary circuit or secondary system.
