SCR Rectifier What is the SCR rectifier of the UPS? UPS (Uninterruptible Power System), that is, uninterruptible power supply, is the battery (mostly lead-acid maintenance-free battery) connected with the host, through the host inverter and other modules to convert DC into mains system equipment The Mainly used for a single computer, computer network systems or other power electronic equipment such as solenoid valves, pressure transmitters, etc. to provide a stable, uninterrupted power supply. When the mains input is normal, the UPS will be powered by the mains supply to the load, this time the UPS is an AC mains regulator, and it also charge the battery to the machine; when the electricity interruption (accident power failure) , The UPS immediately to the battery DC power, through the inverter zero switching method to continue to supply 220V AC load, so that the load to maintain normal work and protect the load soft, the hardware is not damaged. UPS equipment is usually too high voltage or voltage can provide protection.
SCR Rectifier UPS is for China's power grid environment and network monitoring and network systems, medical systems and other power requirements of the reliability, to overcome the large and medium-sized computer network system power supply caused by the increasingly serious power grid environment, with a new digital technology developed The third generation of pure frequency on-line intelligent UPS. DC power supply, is to maintain the circuit to form a steady current device. Such as dry batteries, batteries, DC generators and so on.
UPS and DC power supply is an important power supply protection equipment, the traditional maintenance management include: ① daily inspection appearance, regular replacement of batteries, filter capacitors, fans and other wearing parts, overhaul to do battery activation; ② transformation or use of alternative equipment , Use advanced tools to test battery performance. This kind of management way enterprise input cost is high, the maintenance personnel workload is big, it is not easy to grasp the equipment operation state and the key data in real time, the equipment accident prevention ability is low. Implementation of online maintenance management to avoid the shortcomings of the traditional way, get good benefits.
UPS is the abbreviation of "Uninterruptible Power System", which can ensure that the computer system will continue to work for a period of time after the power outage so that the user can save the file so that the user will not cause the power outage Affect work or loss of data.
The UPS power supply system consists of five parts: mains, bypass, battery and other power input circuit, AC / DC converter rectifier (REC), DC / AC converter inverter (INV), inverter and bypass output Switching circuits and storage batteries. The regulator function of the system is usually completed by the rectifier, rectifier device using thyristor or high-frequency switching rectifier itself has a change in the control of the output according to the external power of the function, so when the external changes (the change should meet the system Required), the output amplitude is basically constant rectified voltage. Purification function from the energy storage battery to complete, due to the rectifier pulse interference can not be eliminated, the rectified voltage is still interference pulse. Energy storage battery in addition to the function can be stored directly DC, the rectifier is like a large container capacitor, the equivalent capacity of the size, and storage battery capacity is proportional to the size. As the voltage at both ends of the capacitor can not be mutated, that is, the use of the smooth pulse characteristics of the capacitor to eliminate the pulse interference, played a purification function, also known as interference shielding. The stability of the frequency is done by the converter, and the frequency stability depends on the stability of the oscillation frequency of the converter. In order to facilitate the daily operation and maintenance of UPS power supply system, the design of the system work switch, the host self-test failure after the automatic bypass switch, maintenance bypass switch and other switch control.
SCR Rectifier When the grid voltage is working normally, the power supply to the load is shown in Figure 1-1, and the battery is charged at the same time. When the power is off, the UPS power supply starts to work, and the power supply from the energy storage battery is (As indicated by the dashed line); when the load is seriously overloaded due to production needs, the grid voltage is rectified to supply power directly to the load (as indicated by the dashed line).
SCR Rectifier When the electricity is normal for the 380 / 220VAC, the DC main circuit has a DC voltage, supply DC-AC AC inverter, the output stable 220V or 380V AC voltage, while the mains after the rectification of the battery charge. When any of the mains undervoltage or sudden power failure, by the battery through the isolation diode switch to the DC circuit to send power. There is no switching time from power supply to the battery. When the battery energy is about to run out, uninterruptible power supply sound and light alarm, and the battery discharge point to stop the inverter work, long alarm. The uninterruptible power supply also has an overload protection function that, when overloaded (150% load), jumps to the bypass state and automatically returns when the load is normal. When a severe overload (over 200% of the rated load) occurs, the uninterruptible power supply immediately stops the inverter output and jumps to the bypass state, and the front input air switch may trip. Eliminate the fault, just close the switch, restart the machine began to resume work.