1. Comparison of EPS power supply and self-contained battery lighting plans
Because battery-powered lights are widely distributed—ranging from hundreds to thousands in typical public buildings—and it's impractical to perform simultaneous charging and discharging protection on all of them, individual protection is necessary (simultaneous protection could paralyze the entire emergency lighting system). Lighting manufacturers require monthly charging and discharging protection, which, at 3-6 hours per light, is practically impossible to achieve. Even if completed, it consumes significant manpower and resources. This is the biggest advantage of EPS (Emergency Powered Lighting) compared to battery-powered lights. Due to these advantages, EPS has gained a substantial market share in the emergency lighting field within just a few years.
2. Differences and comparisons between EPS power supplies and UPS power supplies
UPS stands for Uninterruptible Power System, emphasizing the "uninterrupted" aspect of power supply parameters. It achieves this by having the rectifier and inverter operate online, with no break in the connection between the battery and the inverter's DC bus, thus ensuring continuous output power. Its operating principle is that when the grid power is normal, it rectifies the grid power into DC to power the inverter, which operates online continuously to supply power to the load. When the grid power fails, although the rectified DC power disappears, the battery continues to power the inverter. In UPS operation, online operation is the method to achieve uninterrupted power supply, but it is also the cause of problems. Currently, the losses in the rectification and inverter stages are generally 10%-15%, and when the UPS is operating online, this loss is dissipated as heat. EPS, on the other hand, operates as backup or thermal backup, with almost no loss when the battery is fully charged. The differences in operating principles and application scenarios indicate that UPS cannot replace EPS, especially in fire protection lighting and power applications (UPS online operation itself is a fire hazard).
Equipment requiring millisecond-level power outages, such as computers, program-controlled exchanges, data processing systems, and precision electronic instruments, should not use EPS as backup power; instead, UPS power supplies should be used.
In conclusion, while EPS and UPS are related in classical theory, they address different problems and employ different methods. There is no difference in technological advancement, nor is there a question of which is more advanced or less advanced. They may seem tangent, but they are not concentric circles. In most cases, they are not interchangeable.
3. Comparison of EPS power supply plan and generator set power supply plan
When using a diesel generator for power supply, there is a startup time of about 10 minutes. This 10-minute dead zone is fatal in a fire scene. However, EPS power supply does not have this problem, and the switching time is generally 2-5 seconds.
With the increasing application of EPS (Emergency Power Supply), power-type emergency power supplies will have significant market potential. A terminal-type dedicated emergency power supply control cabinet has obtained a national patent. This patent organically combines emergency power supply, power equipment starting, and power equipment control. Without adding EPS components, it solves the problem of limited power supply failing to start power equipment, achieving a 1:1 capacity starting ratio for EPS-connected motor-type loads. The widespread application of this technology has significantly advanced the global theme of energy conservation and environmental protection in the field of emergency power supply for power equipment.
Because EPS (Electric Power Supply) produces no exhaust, smoke, noise, or vibration and causes no environmental pollution, it is a suitable emergency power supply for locations where environmental protection requirements preclude the use of diesel generator sets.
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