Development of Shante Uninterruptible Power SupplyBefore the era of battery use, uninterruptible power supply (UPS) used flywheels and internal combustion engines to provide power for loads. This kind of UPS is called flywheel or rotary UPS.
Before the era of battery use, uninterruptible power supply (UPS) used flywheels and internal combustion engines to provide power for loads. This kind of UPS is called flywheel or rotary UPS. Flywheel UPS consists of rectifier, DC motor, flywheel, diesel engine (or gasoline engine) and generator. In the case of power supply by the grid, the DC motor provided by the rectifier drives the flywheel to rotate, and the generator supplies power for the load. Because of the inertia of the flywheel, the speed of the generator can be balanced, and the uninterrupted power supply can filter the power grid interference. When the power grid is cut off, the flywheel continues to drive the rotor of the generator to rotate, while starting the diesel engine to drive the generator to generate electricity, replacing the original power grid to supply power for the load.
Because flywheel uninterruptible power supply uses internal combustion engine to provide power, it will produce greater noise and larger volume, so it is generally used in emergency situations and some adverse natural conditions. Usually, uninterruptible power supply will use batteries to supply power.
Battery type uninterruptible power supply
Uninterruptible power supply (UPS) has been improved since the research and production of UPS by General Electric Corporation of the United States in the 1960s, but its basic principle has not changed significantly.
Modern uninterruptible power supply consists of battery pack, inverter and control circuit. One end connects the power grid and the other end connects the electrical load. Under normal grid voltage, uninterruptible power supply uses grid power supply to charge itself. When the grid is abnormal, uninterruptible power supply releases the energy stored in the battery for load use. It can be divided into two types according to its working mode: on-line mode and backup mode (also known as off-line mode); according to the output waveform, it can be divided into sinusoidal mode and approximate sinusoidal mode (using stepped square wave to fit sinusoidal wave).