Analysis of the importance of regulated power supply and UPS power supply for medical equipment
Selection of regulated power supply
( 1) Response time of power supply
The response time of the regulated power supply will be directly reflected on the medical equipment. The interior of the LC AC purification stabilized voltage power supply is an electronic module structure. It uses the sinusoidal energy divider technology to achieve the purpose of voltage stabilization control by controlling the conduction angle of the thyristor, and integrates voltage stabilization and anti-interference. Its response speed is the fastest among all regulated power supplies, and its response speed is less than 4ms. SBW and SVC power supplies are mechanically stabilized voltage supplies, which use the rotation of the motor to drive the carbon brushes to slide back and forth on the autotransformer to achieve the purpose of voltage stabilization. Since the interior is a mechanical structure, this will inevitably have a certain impact on its response speed. From the perspective of response speed, LC AC purification and regulated power supply is undoubtedly the best choice. It is usually applied to the voltage stabilization of high-precision equipment such as B-ultrasound and hemodialysis machines.
( 2) Voltage regulation accuracy
In general, electronic regulated power supplies have higher voltage regulation accuracy than mechanical regulated power supplies. The voltage regulation accuracy of LC AC purification regulated power supply is less than 1%, while the voltage regulation accuracy of mechanical regulated power supplies such as SBW and SVC is between 1% and 5%. Under normal circumstances, for medical equipment such as CT machines and nuclear magnetic resonance instruments that do not require high voltage regulation accuracy, the selection of SBW and SVC regulated power supplies can meet the requirements of the equipment.
normal and safe operation.
(3) Whether there is filtering performance
In medical equipment, some imported instruments, such as hematology analyzers, have very high requirements on the power supply. Usually, it requires the power supply to have a high voltage stabilizing ability, and some slight changes may cause it to fail to work normally. In this case, it is necessary to use an LC AC purification regulated power supply whose harmonic content of the final output waveform is lower than 5%.
Uninterruptible power supply options
According to statistics, under normal circumstances, general medical equipment is subjected to more than 100 power disturbances per month, and these disturbances mainly include voltage changes and power outages. Some of these interferences are easily overlooked because they cannot be distinguished by the naked eye, but usually affect the normal and safe use of the equipment. Therefore, by installing UPS power supply in medical equipment, it can effectively prevent data loss caused by sudden power failure and the sudden stop of equipment, and at the same time, it can effectively avoid the impact of voltage drop on the equipment. When choosing a UPS power supply, the following points should be paid attention to:
(1) UPS power
Typically, UPS power ratings are expressed in VA (volt-amperes). When selecting UPS power supply, first calculate the VA value of medical equipment and leave a certain margin to determine the power of UPS power supply.
( 2) Types of UPS output waveforms
The output waveform of UPS power supply is usually divided into backup type, online interactive type and online type. Medical equipment is a high-precision instrument and has very high requirements on the quality of the power supply. In the actual use process, it is usually equipped with online
UPS power supply, this kind of power supply can well avoid power interference.
(3) Selection of UPS battery capacity
According to the capacity of the back battery, UPS can be divided into two types: standard UPS and extended UPS. The standard UPS can generally extend the operating time of the equipment by 10 minutes after power failure, while the extended UPS can usually prolong the operation of the equipment for several hours after power failure. In actual application, the selection of UPS power supply is usually carried out according to actual needs.
Measures to ensure the stable operation of medical equipment
At present, problems such as voltage instability and electromagnetic interference are common in the use of medical equipment. This has a certain impact on the normal use of medical equipment, and even causes certain hidden safety hazards and medical accidents.
branch power supply
In the case of voltage instability, multi-branch isolation transformers can be used to separate power supplies for devices with very high power requirements, which can effectively avoid mutual interference between devices when using electricity. At the same time, some important medical equipment can be equipped with a power regulator or an online UPS power supply to ensure the safe and stable operation of the medical equipment.
