UPS power system consists of five parts: main circuit, bypass, battery and other power input circuits, rectifier (REC) for AC/DC conversion, and inverter (INV) for DC/AC conversion , inverter and bypass output switching circuits and energy storage batteries.
Uninterruptible power supplies are widely used in: mining, aerospace, industry, communications, national defense, hospitals, computer business terminals, network servers, network equipment, data storage equipment, emergency lighting systems, railways, shipping, transportation, Power plants, substations, nuclear power plants, fire safety alarm systems, wireless communication systems, program-controlled switches, mobile communications and other fields.
Extended information
Power supply working principle:
1. AC-DC conversion:
Put the alternating current from the power grid through the autotransformer Step down, full-wave rectification, and filtering into DC voltage, which is supplied to the inverter circuit. The AC-DC input has a soft-start circuit to avoid impact on the power grid when starting up.
2. DC-AC inverter circuit:
Using a high-power IGBT module full-bridge inverter circuit, which has a large power margin and special output impedance within the output dynamic range. Small, with fast response characteristics. Due to the use of high-frequency modulation current limiting technology and fast short-circuit protection technology, the inverter can work safely and reliably regardless of supply voltage transients, load shocks, or short circuits.
3. Control drive:
Control drive is the core of complete machine function control. In addition to providing detection, protection, synchronization and various switch and display drive signals, it also completes SPWM sinusoidal pulse width modulation control uses static and dynamic dual voltage feedback. The dynamic characteristics and stability of the inverter are greatly improved.
Baidu Encyclopedia-Uninterruptible Power Supply