The selection, load power, and delay time of the UPS power supply are introduced and the maintenance of the battery is introduced.
The rapid development of modern medical technology, medical equipment is constantly updating, some high, fine, and pointed equipment are increasingly applied to clinical. These advanced equipment requirements for power supply systems are also increasingly high, and various sensitive electronic components in the equipment require a sustained power supply. (Especially some import equipment, they are designed in accordance with the international standard grid environment indicators, these equipment can work normally within the standard grid range, and have less fault, long life. But in my country’s grid conditions, it will appear Unstable work, high failure rate, shortening life.
The reason is mainly the current public power system in my country. There are many unstable factors. For example, the grid voltage is sometimes high, low, surge, impact and sudden interruption, etc., which seriously affects the safe operation of medical equipment, and even damage equipment and causing serious economic losses. Therefore, UPS (Uninterruptible
Power
The use of System Uninterruptible Power Supply has become the key to protecting important equipment. At present, most hospitals have some important devices equipped with the corresponding UPS power supply. For example, our hospital is equipped with UPS power supplies for MR, CT, Color ultrasound, biochemical analyzer, and blood cell counter, and these UPS powerways have become the protection of our important medical equipment. Therefore, how to use and maintain the UPS power supply, it has considerable practical significance.
1 Selection of UPS power type
The UPS power is divided into rear-standlash, online interactive, and online. When the rear-columerization UPS power supply is normally supplied, it supplies the voltage supplied to the load to the mainstay of the mainstay of the mainstay. When the market is not normal, it provides a stable square wave to the load. power supply. When the online interactive UPS power supply is normal, it provides a sine wave voltage that is supplied to the load to the load, and only when the market is not normal, only the user load provides inverter. Sine wave power supply. Both the rear preparation and the online interactive UPS power supply can provide a standard sine wave voltage to the load in real time.
The online UPS power supply is different. As long as there is a load work, the inverter has been working, it provides the load to the load, the reliable and stable sine wave power supply after inverting, and the voltage stability is better than the backup and online interactive UPS power supply, and The instantaneous response characteristics of the output voltage have good "purification" and safety protection functions, and the anti-interference ability is very strong. Therefore, there is a large-scale medical device with a relatively large market, and a high voltage stable UPS power supply should be selected. The medical unit equipment basically matches online UPS, in principle, the rear-collaborative UPS power supply can only be used in devices that are not high on output waveforms, such as office equipment, etc., and cannot drive sensitive loads. As our college color ultrasound, it is a 5
KVA rear-standing UPS, the results found that there was always a strip-shadow interference on the screen. After changing a online UPS power supply, the fake shadow phenomenon disappeared.
2 Determination of UPS power load
The nominal capacity of the UPS power supply means that the load is dependent on the power. The load that is actually the UPS power supply is usually non-linear load, which varies with the change of the load power factor. If the output characteristics of the UPS are not good, the output voltage will drop, voltage The stability is reduced, affecting the safety work. Therefore, the ability to determine the capacity of the UPS should be considered for the UPS to determine the actual load capacity according to the rated power and power factor provided by the UPS power supply, and the UPS is avoided because the load is too heavy or damaged. UPS inverter. That is, the rated output power is 1
KVA的UPS电源并不一定能驱动1
KVA的负载。
为了延长UPS的使用寿命，UPS电源不宜长期处于满负荷状态下运行。后备式UPS电源一般选取额定功率的60%~70%的负载量，在线式UPS电源一般选取额定功率的70%~80%的负载量，同时UPS也不宜长期处于过度轻载状态下运行。电池供电时间主要受负载大小、电池容量、环境温度、电池放电截止电压等因素影响，一般计算UPS电池供电时间的公式为T=V*AH*N*P.F/W。其中T是蓄电池组供电时间，V是蓄电池电压，AH蓄电池是定格容量，P.F是UPS电源的输出功率因素，W是负载功率。例如我院CT配备的UPS的蓄电池电压为12
V，定格容量为100 AH，蓄电数量为64块，功率因为为0.7，负载功率为40
KW，那么，它的供电时间则为T=12*100*64*0.7/40000=1.344 h约为80 min，即停电后可维持供电时间约为80 min。
3 UPS电源主机的正确使用 在使用UPS电源之前应认真仔细阅读随机使用说明书。UPS电源适宜长期不间断工作，不宜每天或经常开关机。对负载确需断电的，可在UPS电源输出端与负载之间串接空气开关，关闭空气开关即可断开负载的电源。应定期(半年)对UPS电源做一次清洁除尘工作，以防止灰尘进入机箱影响电子器件散热，而损坏电子器件。应定期检查及更换UPS的散热风扇和大容量电容器。 4 UPS蓄电池的维护 由于UPS电源使用的是免维护蓄电池，每只12 V，基本上都采用串联工作方式，一般是几只至几十只串联不等。只要其中一只电池内阻增高或损坏，则整组电池就不能按设计容量供电，就有可能造成停电事故。所以，必需定期检查和维护蓄电池。 4.1 新购买的UPS电源或新更换的蓄电池要先给电池充足电后再使用 由于UPS电源从生产到用户安装使用，需要一段时间，这段时间内，蓄电池由于自放电造成容量减少，达不到所标称的延时时间，为确保正常供电，UPS在初次使用时必须按产品使用手册上的要求充电数小时。 4.2 环境温度 蓄电池的使用要注意环境温度，蓄电池一般应在0 ℃~30
℃之间环境温度中使用。温度过高蓄电池的寿命将大大缩短，对密封式免维护蓄电池来说，当环境温度超过25 ℃时，温度每升高10
℃，电池的使用寿命将缩短一半。温度过低，蓄电池实际可释放的容量也将大大减少。 4.3 蓄电池组长期处于充电状态下，其内阻会增大或永久性损坏
因此，避免将蓄电池长期置于“浮充”状态，对于那些很少长时间停电的地区运行的UPS电源必须每隔3个月就要人为地放电一次，即关掉UPS电源的交流输入电源，让UPS电源处于电池模式供电，电池放电电流≥0.1
A. 4.4 应避免蓄电池深度放电或长时间小电流过电量放电
当蓄电池小电流放电时，由于从蓄池的端电压下降速度比大电流时缓慢，所以当UPS电源保护关机时，蓄电池实际上已经过电量放电，造成蓄电池失效或寿命缩短。如果蓄电池深度放电，也会影响其寿命，当蓄电池组放电后一般需要8
h~12 h时间充电才能将蓄电池充好。
4.5 定期检查 定期(三个月)检查蓄电池组中每只蓄电池的端电压及其容量，每只蓄电池间端电压不超过1 V若超过1 V就需要进行维护，即用均衡衡压限流0.5 A充电或更换该电池。电池组使用4 a~5 a后需要全组更换,以保证UPS电源的正常使用。
鸿宝是专业从事电源领域产品的科研、开发、生产、销售及技术服务于一体的外向型企业。 The company has more than 1,800 employees, including more than 200 scientific and technological personnel, with an asset of 1 billion yuan, 128,000 square meters of production plants, and continuously won the star enterprises for many years. Honorary title and other credit enterprises.
The company’s main sales, maintenance, maintenance products are: EPS emergency power supply, UPS uninterruptible power supply, inverter, battery, DC screen, fire patrol cabinet, fire power monitoring system, SVC, SBW AC regulator power supply, DC power supply, JJW purification AC power supply, CWY anti-interference AC parameter power supply, SJW microcomputer without contact compensation power regulator, SBW high-power fully automatic compensation power regulator, HBR1 motor soft starter, inverter, charger, voltage regulator More than 30 series of transformers, circuit breakers, micro motors, electric welding machines, energy-saving lamps, 800 varieties, all products are underwritten by Chinese people’s insurance companies.
Changchun Hongbao is an export-oriented enterprise specializing in research, development, production, sales and technical services in power field products.
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