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What is the working principle of emergency power supply?

 EPS Emergency Power Supply in broad sense refers to the interruption of the normal Power Supply, can be short-term Power load to the user's important independent Emergency Power Supply units (EPS Emergency Power Supply), the general appellation of course includes Emergency diesel generator set. As static inverter power supply should be as urgent in building fire power application gradually, the current domestic power supply and fire fighting in the industry is the abbreviation for EPS mainly points to the power electronic technology is static inverter emergency power system (unified EPS for short below).

EPS emergency power system mainly includes rectifier charger, battery pack, inverter, mutual investment device and system controller. The inverter is the core, which usually adopts DSP or single chip CPU to control the inverter to obtain good communication waveform output. The function of the rectifier charger is to recharge the battery pack when the market input is normal. The function of inverter is to convert the direct current of the battery storage unit into alternating current output when the market is abnormal, and the supply load equipment is stable and continuous. The mutual investment device guarantees the smooth switching between the power and the output of the inverter. System controller in real time control of the whole system, and can receive the remote signal fault alarm and linkage control signal, can be realized through a standard communication interface by the upper machine and the EPS system of remote monitoring.

The basic working principle of EPS is:

When the electricity input is normal in the market, input is provided to the important load by the power supply of the municipal electricity, while the system controller automatically detects the municipal electricity and USES the charging machine to charge the battery charge. Often EPS charger capacity equivalent to only 10% of battery capacity (Ah), only provide battery floating or supplement electricity function, does not need to be directly to the inverter's ability to provide dc power supply. At this time, the market power supply to the user's emergency load through EPS. At the same time, under the control of EPS system controller, the inverter stop working in automatic shutdown state. The user load is actually used at this time as the power grid power, which is usually called the EPS emergency power source in the sleep state, which can effectively achieve the effect of energy saving.

2 when the input mains power outage or mains voltage transfinite (15% plus or minus or plus or minus 20% of the rated input voltage), the system controller instructions for each device will be in (0.1 ~ 4) S to inverter power supply, in a short period of time in EPS system under the support of dc energy provided by the battery, the power supply to the user load.

(3) when the input mains voltage return to normal work, the EPS system controller issue instructions for inverter performs shutdown operation, at the same time also by mutual throw switch execution from the inverter power supply to ac bypass switch operation. After that, the EPS will supply the electricity to the load on the ac by-pass supply channel and continue to charge the battery pack through the rectifying charger.

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