Uninterruptible power supply work process
Control drive: control drive is the core of the completion of the whole function control, which in addition to providing detection, protection, synchronization and a variety of switches and display drive signal, but also to complete SPWM sine pulse width modulation control, due to the use of static and dynamic dual voltage feedback The Greatly improving the dynamic characteristics of the inverter and stability. Uninterruptible power supply works block diagram as shown:
In fact, ups uninterruptible power supply works is to protect the power grid stability and computer systems continue to work after a power outage, ups power is widely used in the special requirements of the power grid environment, network systems and medical systems and other fields. Specifically, it is through the AC-DC conversion: the grid to the AC power by the autotransformer buck, full-wave rectifier, filter into a DC voltage, the inverter circuit. AC-DC input has a soft-start circuit, to avoid the impact of the power grid when the boot. DC-AC inverter circuit: the use of high-power IGBT module full-bridge inverter circuit, with a large power margin, the output dynamic range of the output impedance is particularly small, with fast response characteristics. Due to the use of high-frequency modulation current limiting technology, and fast short-circuit protection technology, so that the inverter regardless of the supply voltage transient or load impact or short circuit, can be safe and reliable work.
When the electricity is normal for the 380 / 220VAC, the DC main circuit has a DC voltage, DC-AC AC inverter, the output stable 220V or 380V AC voltage, while the mains after the rectifier 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, the uninterruptible power supply sound and light alarm, and the battery discharge point to stop the inverter work, long warning. 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.
