With the advancement of medical science and technology, various sophisticated instruments and equipment are widely used in the medical field, and the introduction of this equipment plays an important role in the diagnosis and treatment of patients. Because medical equipment has high requirements on the quality and voltage of the power supply, if the quality of the power supply is poor, it is easy to cause the medical equipment to crash during operation, damage to components and data loss caused by program execution errors, etc., which will cause great damage. It is a hidden danger to medical safety and brings a lot of economic losses to the hospital. At present, hospitals generally use AC voltage stabilizers and UPS uninterruptible power supplies to ensure the normal and safe operation of medical equipment.

1. Selection of regulated power supply

At present, there are many types of regulated power supplies on the market, such as electronic regulators, AC compensation regulators, numerically controlled non-contact regulators, etc. The following aspects should be paid attention to when telling the regulated power supply:

• The response time of the power supply the response time of the voltage regulator will be directly reflected on the medical equipment. It is usually used in the voltage stabilization of high-precision equipment such as B-ultrasound and hemodialysis machines.  
• In the selection process, the voltage regulation accuracy needs to be considered. Usually, PET, DR, CT, MR nuclear magnetic resonance instruments, etc. have high requirements on the voltage regulation accuracy. It can quickly solve the voltage instability.

2. The choice of uninterruptible power supply

According to statistics, medical equipment is disturbed by power supply more than 80 times per month. These disturbances mainly include voltage changes, power outages (including short-term power outages in milliseconds), phase loss, and poor phase balance. Among these disturbances, a large part of the situation is easy to be ignored because it cannot be perceived or distinguished by the naked eye, but it usually affects the normal and safe use of the equipment. By installing UPS uninterruptible power supply in medical equipment, it can be effectively prevented the impact of the instantaneous current impact of the device, the loss of data caused by a sudden power failure, or the sudden stop of work on the device.

When choosing UPS uninterruptible power supply, you should pay attention to the following points:

• The power of UPS is usually expressed in VA. When choosing UPS power supply, first calculate the VA value of medical equipment and Leave enough margins to determine the power of the UPS power supply.  
• The types of UPS output waveforms are usually divided into square wave backup type, sine wave online interactive type and online type. Sine waves are characterized by no harmonics, zero second transitions. Medical equipment is a high-precision instrument and has very high requirements on the quality of the power supply. In the actual use process, an online UPS power supply is usually selected, which can well avoid the phenomenon of power supply interference.  
• Selection of battery capacity the capacity of the backup battery can be divided into two types: the standard machine and the extension machine. The standard machine has a built-in battery, which can generally extend the use time of the equipment for 10 to 15 minutes after a power failure, while the extension machine is generally equipped with a battery cabinet. It can usually be extended for a longer period of time. In practical applications, it is usually selected according to needs.

3. Measures to ensure the stable operation of medical equipment:
At present, problems such as unstable power supply and electromagnetic interference generally exist during the use of medical equipment, which have certain potential safety hazards for the normal use of medical equipment.  

• Branch power supply In the case of unstable voltage, multi-branch isolation transformers can be used, which will separate power supply for equipment with very high power requirements, which can effectively avoid the mutual interference of various equipment when using electricity, and can also provide power to the equipment. Some important equipment is equipped with a dedicated AC voltage stabilizer or UPS uninterruptible power supply to ensure the safe operation of medical equipment.  
• Equipped with power quality purification device. By using AC voltage stabilizer and high-frequency power filter, the stable operation of the equipment can be ensured, and the interference of electromagnetic waves on the power line transmission process can also be reduced. By adding an AC voltage stabilizer, it can also effectively suppress the instantaneous high voltage and instantaneous drop caused by the surge. In addition, the external interference to the power supply can be reduced by connecting the ground wire.  

Medical equipment is a kind of equipment that has very high requirements on power quality. The decline of power quality will make the use of medical equipment unstable, ranging from suspension of use of medical equipment, and damage to equipment in severe cases, causing medical accidents. Therefore, the configuration of regulated power supply and UPS uninterruptible power supply plays an important role in ensuring the safe and normal use of medical equipment, which is of great significance to further improve the quality of medical care.

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