With the rapid development of medical technology, medical equipment is constantly being updated, and some high-quality, sophisticated, and pointed devices are increasingly used in clinical practice. These advanced devices are increasingly demanding power supply systems, and various sensitive electronic components in the device require a constant power supply. In particular, some imported equipments are designed according to the international standard grid environment indicators. These equipments can work normally in the standard grid range, with few faults and long service life. However, in China's power grid conditions, there will be unstable operation, high failure rate and shortened life. The reason is mainly because there are many unstable factors in the current public power system in China. For example, the grid voltage is sometimes high, low, surge, shock and sudden interruption, which seriously affects the safe operation of medical equipment and even damages equipment and causes serious economic losses. Therefore, the use of UPS (Uninterruptible power system) has become the key to the protection of important equipment. At present, most hospitals have equipped some important equipment with corresponding UPS. For example, our hospital has equipped UPS for MR, CT, color ultrasound, biochemical analyzer, blood cell counter and other equipment. These UPS have become the protectors of these important medical equipment. Therefore, how to use and maintain the UPS has considerable practical significance.
1. Choice of UPS type
UPS is divided into three types: backup, online interactive and online. When the mains supply is normal, the backup UPS supplies the load with a sinusoidal voltage that is slightly regulated by the mains voltage. When the mains supply is not normal, it provides a stable square wave power to the load. . Online interactive UPS When the mains supply is normal, it supplies the load with a sine wave voltage that is slightly regulated by the mains voltage. Only when the mains supply is not normal, the inverter is supplied to the load. Sine wave power supply. Both backup and online interactive UPSs do not provide a standard sine wave voltage to the load in real time. The online UPS is different. As long as the load works, the inverter works all the time. It provides a reliable and stable sine wave power supply after the inverter, and the voltage stability is better than the backup and online interactive UPS, and the output voltage. It has good transient response characteristics, good "purification" effect and safety protection function, and has strong anti-* ability. Therefore, in areas with large fluctuations in mains power and medical equipment with high requirements for power supply quality, online UPS with good voltage stability should be used. In principle, the backup UPS can only be used in some devices that do not require high output waveforms, such as office equipment, and cannot drive inductive loads. For example, the color ultrasound of our hospital was initially equipped with a 5 KVA backup UPS. It was found that there were always strips of artifacts on the screen*. After changing an online UPS, the artifacts disappeared.
2. Determination of UPS load
The nominal capacity of the UPS is its apparent power. In fact, the load of the UPS is usually a non-linear load, which varies with the load power factor. If the output characteristics of the UPS are not good, the output voltage will drop and the voltage stability will be reduced. Reduce, affect the load safety work. Therefore, when determining the capacity of the UPS, the UPS should be considered with the ability of non-linear load, that is, according to the rated power and power factor provided by the UPS to determine the actual load capacity, to avoid the UPS is not working properly or the UPS is damaged due to excessive load. Inverter. This means that a UPS with a rated output of 1 KVA does not necessarily drive a 1 KVA load. In order to extend the life of the UPS, the UPS should not be operated at full load for a long time. The backup UPS generally selects the load of 60%~70% of the rated power. The online UPS generally selects the load of 70%~80% of the rated power, and the UPS should not be operated under excessive light load for a long time. The battery power supply time is mainly affected by factors such as load size, battery capacity, ambient temperature, and battery discharge cutoff voltage. The formula for calculating the power supply time of the UPS is generally T=V*AH*N*PF/W. Where T is the battery pack power supply time, V is the battery voltage, AH battery is the fixed capacity, PF is the output power factor of the UPS, and W is the load power. For example, the UPS of our hospital CT has a battery voltage of 12 V, a fixed capacity of 100 AH, a power storage capacity of 64 blocks, a power of 0.7, and a load power of 40 KW. Then, its power supply time is T=12* 100*64*0.7/40000=1.344 h is about 80 min, that is, the power supply time can be maintained for about 80 min after power failure.
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