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Standby power is one of the basic elements of a security monitoring system. The system that lacks the backup power supply has hidden fatal flaws and cannot be put into practical use, because it is very likely to delay the fighters, stop and lock down, and paralyze the entire system at a critical moment, resulting in irrecoverable losses.
The security monitoring system normally uses 220 volts of utility power, but in the special case of power failure and mains destruction, it should also work for a certain period of time. This requires the use of backup power to maintain the normal operation of the monitoring system during this period of time. Backup power supply has two or more power supply, battery pack power supply, generator power supply, UPS power supply and so on. However, UPS uninterruptible power supply is usually used as backup power source for security monitoring system.
First, the working principle of UPS (uninterrupted power supply)
The UPS power supply consists of a battery, an inverter, a charger, a voltage stabilizer, and a changeover switch. When the utility power is input normally, the UPS will supply the load after the utility voltage is regulated, at the same time, the internal battery pack will be charged, and the energy will be stored in the battery; when the utility power is interrupted (accidental power failure) or the input fault, the UPS will immediately The energy conversion of the battery will continue to be used by the load with 220 volts alternating current, so that the load can maintain normal operation and protect the load hardware and software from damage. UPS power supply is divided into backup, online, online interactive three categories:
1. Standby UPS When the mains supply is normal, the mains supply the power directly to the load via the AC bypass channel via the transfer switch. The inverter in the UPS is in a stop working state. At this time, the UPS power is essentially equivalent to A single-purpose utility voltage regulator. In addition to the improvement in the amplitude fluctuation of the mains voltage, it has basically no adverse effects on the frequency instability of the voltage, waveform distortion, and intrusion from the grid. Only when the mains power supply is interrupted or lower than 170V, the battery will immediately supply power to the inverter and provide the load with a square wave AC voltage with constant voltage and frequency stabilization.
2. When the on-line UPS power supply is powered normally, it first rectifies the mains AC power supply into a DC power supply, and then performs pulse width modulation, filtering, and reconverts the DC power supply into a sine wave AC power supply via the inverter. Power is supplied to the load. Once the commercial power is interrupted, the DC supplied by the battery is immediately replaced by an inverter, pulse width modulation, and filtering to provide a sine wave AC power supply to the load.
Therefore, for on-line UPS, under normal circumstances, whether there is no electricity, it is powered by the inverter of the UPS power supply to the load, thus avoiding all the voltage fluctuations caused by the mains grid and * Impact.
Obviously, the power quality of the online UPS power supply is obviously better than that of the standby UPS power supply because it can achieve stable frequency and stable power supply to the load. Moreover, when the mains is converted to the battery power supply, the conversion time is basically zero, and the user is provided with a pure sine wave power supply with a high-quality stable voltage and frequency stability, thereby providing the power supply protection required by the security monitoring system.
Online interactive UPS power supply combines many advantages of standby UPS and online UPS, and it is also a very good form of transformation. However, because it uses a power frequency transformer, it has a bulky and bulky problem.
Second, how to configure the security monitoring system UPS power supply UPS is the birth of the computer and the emergence of backup power. In the security monitoring system, more and more applications of computer technology, so the higher and higher requirements for power supply quality. UPS can not only comprehensively improve the quality of power supply, but also provide comprehensive protection for the entire system and even network data. It can also ensure the normal operation and operation under the special conditions of mains power failure and human damage. Because the security monitoring system requires higher power supply, it usually chooses on-line (sine wave, mains power) UPS power supply.
When UPS power supply is provided to the security monitoring system, the power consumption of the entire system equipment should be estimated first. The safety factor is generally 1.2-1.5, which is sufficient for the power supply system to have sufficient redundancy. Second, according to the system requirements delay power supply time, calculate and configure the battery pack. Finally, we should pay attention to the use of the environment, moisture-proof ventilation, focus on cooling, to extend the average time between failures and improve the reliability of the system. The UPS power supply should be set up in the monitoring room to implement unified management. When the commercial power is abnormal, it can provide uninterrupted power supply to the system equipment in time to ensure that the system works normally.
How to configure the UPS power supply for security monitoring system
UPS is an abbreviation for "uninterruptible power system". It is the "heart" part that powers the security monitoring system. It provides an important external equipment for the security monitoring system to provide continuous, stable, uninterrupted power supply. At present, there are a wide variety of UPS power supply devices on the market, and the output power is also different. UPS uninterruptible power supply can be divided into standby type and online type according to the working mode. According to its output waveform is divided into square wave output and sine wave output two. This article describes the working principle of the UPS power supply, and how to configure the UPS power supply of the security monitoring system.