The main body of the emergency power supply is a battery. Its most basic function is to store electric energy. In the case of freezing or failure of the vehicle battery, it does not require any AC power supply and can be used as a starting car, truck, ship, etc. Start the system.
EPS emergency power supply refers to an independent emergency power supply (EPS: Emergency Power Supply) that can supply short-time power to the user's important load when the normal power supply is interrupted. This broad name includes the emergency diesel generator set. As static inverter power supply should be used as a gradual application of emergency power supply in building fire protection, the current domestic power supply and fire protection industry is referred to as EPS mainly refers to the use of power electronic technology static inverter emergency power supply system (hereinafter referred to as EPS).
EPS emergency power system mainly includes rectifier charger, battery pack, inverter, mutual investment device and system controller. The inverter is the core, usually adopts DSP or single-chip CPU to perform SPWM modulation control on the inverter part, so that it obtains good AC waveform output; the function of the rectifier charger is to realize the timely timing of the battery pack when the mains input is normal. Charging; the role of the inverter is to convert the DC power stored in the battery pack into an AC output when the mains is abnormal, and supply the load equipment with stable and continuous power; the mutual investment device ensures the load between the mains and the inverter output. Smooth switching; the system controller controls the whole system in real time, and can issue fault alarm signals and receive remote linkage control signals, and can realize remote monitoring of the EPS system by the host computer through the standard communication interface.
The basic working principle of EPS can be clearly illustrated in Figure 1:
(1) When the mains input is normal, the input mains supply powers the important load through the mutual investment device, and the system controller automatically performs the mains detection and the battery pack charging management through the charger. Usually, the capacity of the EPS charger is only equivalent to 10% of the battery pack capacity (Ah). It only needs to provide the battery pack float or recharge function, and does not need to have the ability to directly supply DC power to the inverter. At this time, the utility power supplies power to the emergency load of the user via the mutual investment device in the EPS. At the same time, under the control of the EPS system controller, the inverter stops working in an automatic shutdown state. The user load is actually used as the power grid at this time. At this time, the EPS emergency power source is usually in a sleep state, which can effectively achieve the effect of energy saving.
(2) When the mains power supply is interrupted or the mains voltage is out of limits (±15% or ±20% of the rated input voltage), the system controller commands the mutual input device to switch to (0.1~4)S for a short time. The inverter is powered, and the EPS system supplies power to the user load with the support of the DC energy provided by the battery pack.
(3) When the input mains voltage returns to normal operation, the EPS system controller issues an instruction to perform a shutdown operation on the inverter, and also performs a switching operation from the inverter power supply to the AC bypass power supply through the mutual switch. The EPS then supplies the mains to the load via the AC bypass supply path while continuing to charge its battery pack through the rectification charger.
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Label: Basic working principle of emergency power supply
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