Ups uninterruptible power supply
The UPS power supply mainly has four parts: rectification, energy storage, conversion and switch control.
The main function of the rectifier is to ensure the stability of the entire UPS power system. The rectifier device generally uses a thyristor or high-frequency switching rectifier, which can control the output amplitude according to the change of external power, so that when the external power changes (the change should be Meet the system requirements), the output voltage is basically the same as the rectified voltage. The purging function is performed by the energy storage battery. Since the rectifier can not eliminate the transient pulse interference, the rectified voltage still has interference pulses. In addition to the function of storing direct current energy, the energy storage battery is like a large container capacitor for the rectifier, and its equivalent capacitance is proportional to the capacity of the energy storage battery. Since the voltage across the capacitor cannot be abruptly changed, that is, the smoothing characteristic of the capacitor is used to eliminate the pulse interference, and the purification function is also used, which is also called the shielding of the interference. 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 the UPS power system, the system work switch, the automatic bypass switch after the host self-test fault, and the bypass switch such as the bypass switch are designed.
When the grid voltage is working normally, the load is supplied as shown, and at the same time, the energy storage battery is charged; when the power failure occurs, the UPS power supply starts to work, and the energy storage battery supplier supplies the power required by the load to maintain normal production; When the load is severely overloaded due to production requirements, the grid voltage is directly rectified to supply power to the load.
The UPS power system is mainly divided into two parts, the main unit and the energy storage battery. The rated output power depends on the host part and is related to the nature of the load. Because the UPS power supply has different load driving capabilities for different performances, the load power should normally meet 70% of the rated power of the UPS power supply. The selection of the energy storage battery capacity depends on the length of the backup time after the load power is determined. This time varies depending on the situation of each enterprise. It is mainly determined by the access time of the backup power supply, usually in a few minutes or several hours. .
Ups uninterruptible power supply working principle
AC-DC conversion: The AC power from the power grid is stepped down by an autotransformer, full-wave rectified, and filtered into a DC voltage for supply to the inverter circuit. The AC-DC input has a soft-start circuit to avoid the impact on the grid when it is turned on.
DC-AC inverter circuit: It adopts high-power IGBT module full-bridge inverter circuit, which has a large power margin. The output impedance is extremely small in the output dynamic range and has 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 whether it is a supply voltage transient or a load shock or short circuit.
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 due to static and dynamic dual voltage feedback. . The dynamic characteristics and stability of the inverter are greatly improved.
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