hätävirranlähde

Hätävirranlähde, also known as an emergency power supply or uninterruptible power supply (UPS), is a device that provides backup power to electrical equipment when the primary power source fails. It typically consists of a battery, an inverter, and a transfer switch. When the main power is interrupted, the transfer switch detects the outage and disconnects the equipment from the failed mains supply. Simultaneously, the battery begins to discharge, and the inverter converts the battery's direct current (DC) into alternating current (AC) that the equipment can use.

The primary purpose of a hätävirranlähde is to prevent data loss or system shutdowns in critical applications such as computers, servers, medical equipment, and security systems. It allows for a graceful shutdown of the equipment or provides sufficient time for a generator to start up. The runtime of a hätävirranlähde varies depending on the battery capacity and the power consumption of the connected devices.

There are different types of hätävirranlähde, including standby, line-interactive, and online UPS systems. Standby UPS systems are the most basic, switching to battery power only when an outage is detected. Line-interactive UPS systems offer some voltage regulation even when on mains power. Online UPS systems provide continuous power conditioning and isolation, constantly supplying power through the inverter, thus offering the highest level of protection. Choosing the right type and capacity of hätävirranlähde depends on the specific needs and criticality of the equipment it is intended to protect.