What is an emergency power supply?
EPS emergency power supply is also known as EPS, EPS emergency power supply, and fire emergency power supply. The new national standard is "Fire Emergency Lighting and Evacuation Indication System". It is an emergency power supply used for power protection and fire safety in important buildings today. It is mainly composed of input and output units, charging modules, battery packs, inverters, monitors, and output switching devices. It is widely used in energy-saving power supply, building lighting, road traffic lighting, tunnel lighting, electric power, industrial and mining enterprises, fire elevators, etc.
What is a UPS power supply?
UPS uninterruptible power supply is system equipment that connects the storage battery (currently many lead-acid batteries are changed to lithium iron phosphate batteries) and the host, and converts DC power into mains power through the host inverter and other module circuits. It is mainly used to provide a stable and uninterrupted power supply to a single computer, computer network system, or other power electronic equipment such as solenoid valves, pressure transmitters, etc. When the mains input is normal, the UPS will stabilize the mains and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery inside the machine; when the mains is interrupted (accidental power failure) Immediately, UPS will continue to supply 220V AC power to the load through the method of inverter zero-switching conversion from the battery's DC power, so that the load can maintain normal operation and protect the load's software and hardware from damage. UPS equipment usually provides protection against over-voltage or under-voltage.
The difference between EPS emergency power supply and UPS power supply
1. Different applications
In China, EPS emergency power supplies are mainly used for electrical equipment in the fire protection industry, emphasizing the function of continuous power supply.
UPS uninterruptible power supplies are generally used for precision instrument loads (such as computers, servers, and other IT industry equipment), requiring high power supply quality, emphasizing the requirements of inverter switching time, output voltage, frequency stability, and purity of the output waveform.
2, EPS emergency power supply and UPS uninterruptible power supply have different structures
EPS emergency power inverter has a large redundancy, the incoming and outgoing cabinets are both inside the EPS, and the motor load has a variable frequency start. The casing and wires have flame-retardant measures and have multi-channel mutual input power, which can be linked with fire protection.
UPS uninterruptible power supply inverter redundancy is relatively small, has nothing to do with fire protection, no flame retardant, no mutual input function.
EPS emergency power supply load is generally inductive and resistive. It can be equipped with motors, lighting, fans, water pumps, and other equipment. It is an emergency fire-fighting product and a dedicated emergency fire-fighting lighting power supply for a centralized emergency power supply.
UPS uninterruptible power supply load is a capacitive load, and the main band equipment is generally a computer, which is mainly used in large computer rooms to ensure uninterrupted power supply and voltage stabilization.
Different functions
Both EPS emergency power supply and UPS uninterruptible power supply have mains bypass and inverter circuits. The functional difference is: EPS emergency power supply has a continuous power supply function, and generally does not require high inverter switching time, and is used in special occasions. It has certain requirements, has multiple outputs, and has monitoring and detection functions for each output and a single battery. The daily focus is on the bypass power supply, and it is switched to the inverter power supply when the mains power fails, and the power utilization rate is high.
UPS power supply such as online type has only one total output, generally emphasizes its three major functions: (A) voltage stabilization and frequency stabilization (B) uninterrupted power supply that requires extremely high switching time (C) can purify the mains. The daily focus is on the rectifier/inverter double conversion circuit for power supply, and the inverter is switched to bypass power supply only when the inverter fails or is overloaded, and the power utilization rate is not high (usually 80%-90%).
