The importance of voltage regulator and UI power supply to

As an important tool for doctors to diagnose and treat patients, medical equipment plays a very important role in the development of the hospital. In order to ensure the normal operation of medical equipment, the branch must have stable and reliable power supply. The quality of power supply directly affects the use of medical equipment.
With the progress of medical science and technology, a variety of precision instruments and equipment are widely used in the medical field. The introduction of these equipment plays an important role in the diagnosis and treatment of patients. Due to the high requirements for the quality and voltage of the power supply, if the quality of the power supply is poor, it is easy to cause the data loss caused by the crash, component damage and program execution error in the operation process of the medical equipment, which will cause great potential medical safety hazard and bring a lot of economic losses to the hospital. At present, hospitals generally use AC voltage regulator and UI UI to ensure the normal and safe operation of medical equipment.
Selection of stabilized power supply
At present, there are many kinds of regulated power supply in the market, such as electronic voltage regulator, AC compensation voltage regulator, numerical control contactless voltage regulator, etc. the following aspects should be paid attention to when telling the regulated power supply:
One
The response time of the power supply and the response time of the voltage regulator will be directly reflected on the medical equipment. Shenzhen Jingyuan science and technology swdt CNC contactless voltage regulator is an electronic module structure. It uses sinusoidal energy distributor technology to achieve the purpose of voltage regulator control by controlling the size of thyristor conduction angle, and integrates voltage stabilization and anti-interference. Its response speed is 4ms / step, which is the fastest of all AC voltage regulators. The general mechanical voltage regulator uses the rotation of the motor to drive the carbon brush to slide back and forth on the autotransformer to achieve the purpose of voltage stabilization. Its production cost is relatively low, economical and practical, and can meet the voltage stabilizing requirements of most equipment. But in terms of response speed, swdt NC contactless voltage regulator is undoubtedly dominant. It is usually used in the voltage stabilization of high-precision equipment such as B-ultrasound and hemodialysis machine.
Two
The voltage stabilization accuracy of mechanical voltage regulator is ± 2%. Generally, Dr, CT, Mr NMR instrument and other instruments do not have high requirements on voltage stabilization accuracy, so mechanical voltage regulator can be selected. However, due to power grid quality and neutral point deviation, the output phase voltage of 220 V and line voltage of 380 V can not all achieve the expected voltage stabilization effect. In view of this situation, Shenzhen Jingyuan Technology Co., Ltd Ltd. developed a zero line generator, with the use of AC voltage regulator, can make the phase and line voltage can be accurate output.
Three
Whether there is filtering performance in medical equipment, some imported instruments, such as blood cell analyzer, have very high requirements for power supply. Usually, the power supply it needs has a high voltage stabilizing ability. Some subtle changes may cause it to fail to work normally. In this case, it is necessary to use the swdt NC contactless voltage regulator whose harmonic content of the final output waveform is less than 5%.
Selection of UI
According to statistics, medical equipment in villages and towns suffers more than 50 times of power supply interference every month, which mainly includes voltage change, power failure (including short-term power failure in milliseconds), phase loss, poor phase balance, etc. Most of these interferences can not be perceived and can not be distinguished by naked eyes, so they are easy to be ignored. However, they usually affect the normal and safe use of equipment. Therefore, through the installation of UI in medical equipment, it can effectively prevent the impact of equipment instantaneous current impact, data loss caused by sudden power failure or sudden stop of work on the equipment. In the selection of UI UI UI, the following points should be noted:
One
Usually, the power value of UI is expressed by va. when choosing the UI power supply, the VA value of medical equipment should be calculated first and a certain margin should be reserved to determine the power of UI.
Two
The types of UI output waveforms are usually divided into square wave backup mode, sine wave online interactive mode and online mode. Zero second harmonic conversion is characteristic of sine wave. Medical equipment is a kind of high-precision instrument, which requires high quality of power supply. In the actual use process, online UI power supply is usually selected to avoid power interference.
Three
Battery capacity selection: the capacity of backup battery can be divided into standard machine and extension machine. The battery of standard machine is built-in, which can extend the service time of equipment by 10-15 minutes after power failure. The extension machine is generally equipped with battery cabinet, which can extend the time for a longer time. In practical application, it is usually selected according to the needs.Measures to ensure the stable operation of medical equipment at present, in the use of medical equipment, there are common problems such as power instability and electromagnetic interference, which have certain security risks for the normal use of medical equipment. One Branch power supply can adopt multi branch isolation transformer to supply power separately for equipment with high power requirements, which can effectively avoid mutual interference of various equipment in power consumption. At the same time, some important equipment can be equipped with special AC voltage regulator or UI uninterruptible power supply, so as to ensure the safe operation of medical equipment. 2. Equipped with power quality purification device, the stable operation of the equipment can be ensured by using AC voltage regulator and high frequency power filter, and the interference of electromagnetic wave on power line transmission process can be reduced. Through the installation of AC voltage regulator, it can also effectively suppress the occurrence of transient high voltage and instantaneous drop caused by surge. In addition, the external interference to the power supply can be reduced by connecting the ground wire. Conclusion end medical equipment is a kind of equipment with very high requirements for power quality. The decline of power quality will make the use of medical equipment unstable, which may cause medical equipment to stop using, or even damage the equipment, causing medical accidents. Therefore, the configuration of regulated power supply and UI 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 medical quality. Application of industrial UI in automobile welding robot anti electric shock (industry consultation) original he Chun UI application on November 7, 2017, the most widely used robot in the industrial manufacturing field is welding robot. In particular, in the automobile manufacturing industry, the use of robots accounts for about 30% of the total industrial robots, and the number of welding robots accounts for about 60%. For the imported original welding robot, the manufacturer added a regulated power supply in front of the input terminal of the controller. However, this measure obviously has serious deficiencies. Only industrial UI can perfectly solve the power problem, especially the voltage sag commonly seen in the industrial field, namely "power swing".The traditional manual welding has the disadvantages of large amount of labor, high labor cost and bad working environment. The welding accuracy is affected by the quality of workers and the efficiency is low. It can not meet the requirements of quality and output of modern high-tech products. Therefore, to ensure the stability of welding product quality, improve productivity and improve labor conditions have become the problems to be solved urgently in the development of modern welding manufacturing technology, thus the welding robot in the field of industrial manufacturing emerges as the times require. At present, the welding robot is the most widely used robot in the industrial manufacturing field. Especially in the automobile manufacturing industry, the robot usage accounts for about 30% of the total industrial robots, and the number of welding robots accounts for about 60%. The production process of automobile welding robot is complex, there are many interlocking devices, and various detection signals affect each other. If any robot in the production line stops due to electrical fault, the operation of the whole production line will be affected. In 2015, a famous automobile manufacturer, in its newly started welding branch, had frequent failures of welding robots on the production line. The reason is that the voltage sag caused by the large number of servo motors of dozens of welding robots can not be solved by adding a regulated power supply in front of the controller input terminal when the imported industrial robot manufacturer is in complete set. In Figure 1, the main task of the industrial robot controller is to control the robot's motion position, posture and trajectory, operation sequence and action time in the workspace. The degree of freedom of a robot depends on the number of joints it can move. The more the number of joints, the higher the degree of freedom, the better the displacement accuracy, and the more servo motors need to be used; in other words, the more precise the industrial robot, the more servo motors there are. There are three types of servo motor: 1. Hydraulic and pneumatic drive: slow response speed and low precision. With the improvement of response speed and control accuracy requirements of welding robot servo drive system, hydraulic and pneumatic drive are gradually withdrawn from the market; 2. DC Motor Service: DC servo has the advantages of high precision and simple control system, which is the mainstream of current servo system. However, there is a brush mechanical reversing mechanism, which may cause harm to the safety of the work site. At the same time, the mechanical reversing mechanism is easy to wear, which is not conducive to the continuous and reliable work of the servo system, and the maintenance is difficult;
Three
AC permanent magnet synchronous motor servo: small mass power ratio, no mechanical reversing mechanism, easy to maintain, but the control system is more complex, not easy to achieve high-precision control. With the development of technology, AC synchronous motor gradually has good technical performance, such as wide speed range, high speed stability precision, fast dynamic response and four quadrant operation, and is gradually replacing DC motor.
Each multi axis robot is controlled by a set of control system, which means that the performance of the controller is required to be high. Once the controller misoperation, shutdown or even data loss occurs due to power problems (power failure, surge, overvoltage, low voltage, etc.), it will lead to a major accident. After analyzing the failure of the power supply added in front of the controller's input terminal, it is found that 98% of the failure of the regulated power supply can not work normally, which is caused by voltage sag, i.e. "power swing". The configuration of regulated power supply has inherent defects, so industrial UI should be selected.
We know that no matter how much the power supply bureau spends to improve the power grid, it still can not avoid the occurrence of voltage sag or rise, voltage surge, harmonic interference, frequency drift, transient peak / high voltage, power outage and other power quality problems, which will bring adverse effects to power users. This is because there are a large number of loads on the power grid, some of their working state and fault state, as well as natural disasters, will affect the security and reliability of the power grid. Such as: lightning and rainstorm, strong wind and snow, misoperation of crane and excavator personnel in construction, animal contact line, other large motor starting, short circuit fault, line switching power distribution device fault, etc.
According to statistics, the voltage sag ranges from 70% to 90% of the rated value (residual voltage), and the typical duration is 10ms-1s. The number of sags encountered by each user in a year varies from more than ten times to hundreds of times. Among all kinds of power quality problems, voltage sag is the most important factor that causes abnormal operation or shutdown of electrical equipment. According to EPRI statistics, more than 90% of power quality events are voltage sags. Voltage sag has the characteristics of high frequency of occurrence and the cause of accident is not easy to detect.
The concept of "shaking electricity"
Voltage sag (voltage sag; voltage dip), commonly known as "power swing", refers to the sudden event that the effective value of power supply voltage suddenly drops sharply and returns to normal in a short period of time. Voltage sag is also known as voltage sag, voltage sag, transient voltage fluctuation and voltage sag in China. Most of them are caused by lightning strike, short circuit, heavy load starting, etc., and the voltage of power supply drops sharply or the voltage is interrupted for several seconds for a short time, resulting in the failure of electrical equipment. The amplitude, duration and frequency of voltage sag are usually used to describe voltage sag, and sometimes the abrupt change of phase is also considered. The International Institute of electrical and Electronic Engineers (IEEE) defines the voltage sag as that the effective value of the supply voltage drops rapidly to 90% - 10% of the rated value, and then recovers to the normal value; while the International Electrotechnical Commission (IEC) defines the voltage sag as falling to 90% - 1% of the rated value with a duration of 10ms-1min.
The harm of "shaking electricity"
Most of the motors are controlled by AC contactor, soft starter and frequency converter. The AC contactor will release and the soft starter and frequency converter will be shut down when the power is shaken. And the shutdown of key units will lead to large units, even the whole production plant chain shutdown, and eventually lead to the continuous production process is forced to interrupt, production units are forced to stop operation, thus causing huge economic losses to enterprises, and sometimes fire, explosion and other vicious accidents occur. Figure 2 shows the causes, effects and consequences of "power swing".
According to the needs of users, we adopt integrated solutions to solve the problems of different voltage levels, different frequency levels and not being monitored by UI host in different countries in the original split solution, which not only reduces the floor area, improves the availability, but also saves the cost for users. Through the load analysis of the site and the investigation of the site environment, adhere to the method of "high engineering modularization" and comply with the "industry 4.0" principleWe should carry forward the "craftsman spirit" attitude, overcome difficulties, redesign and adjust the electrical parameters of some components in UI system, and provide customized solutions for users on time. The solution has many advantages, such as strong stability, high reliability and strong expansion. It meets the special requirements of user protection level, simple system architecture, simple operation and system reliability, and ensures that UI can continuously provide high reliable UI power supply under the condition of power supply system outage.
After replacing the imported robot regulated power supply with industrial UI, it has been running well for two years without any emergency repair, which is highly praised by users.
Characteristics of power frequency industrial UI solution
High engineering component system solution
The reliability and applicability of UI system are greatly improved by taking the user as the center and jointly studying and judging the power consumption environment, load environment, space and climate environment.
Safety and reliability
Safe and reliable operation of the system is the most fundamental requirement of every industrial system, and the safety and reliability of power supply (backup power supply or security power supply) system is the lifeblood of the system. For industrial equipment with high degree of automation, the safety and reliability of power system operation is particularly important. According to the above principles, in the preliminary design, the industrial UI system is selected to ensure the safety and reliability of the components. In the design of the cabinet, the grounding, ventilation and moisture-proof design of the cabinet are fully considered, so that the reliability of the whole system is greatly improved in hardware. The structured and modular design of UI software enhances the hierarchical fault-tolerant design of the system, prevents the system from entering the passive out of control state, strengthens the function of fault detection and alarm and emergency treatment, and improves the security of the system.
Real time
The industrial UI core control chip adopts the original imported high-performance digital signal processor and distributed control system. Compared with the traditional equipment composed of microprocessor, UI has higher output voltage quality, better dynamic performance, better real-time performance, and more rapid emergency processing ability. Therefore, it is more suitable for harsh grid environment, The reliability of the whole machine has been improved.
Ease of operation
The design of man-machine operation of the system fully considers its convenience, beauty and practicality. The user interface and interface design fully consider the structural characteristics and visual characteristics of human body to optimize the design; the interface is beautiful and easy to operate, and the LCD display interface is fully Chinese display.
Maintainability
Industrial UI adopts pluggable module design to improve the speed of system maintenance and fault detection, and shorten the average maintenance time of the system (MTTR < 0.5hour).
Progressiveness
On the premise of meeting the overall operation requirements and safety and reliability, the main equipment selection of the system conforms to the development trend of computer technology and power electronic technology, which can ensure that there is no need to update for a long time in the future, so as to realize the smooth upgrading and expansion requirements of the system in the future.
Openness
The selection of the main equipment of the system considers the networking with the computer monitoring system. The monitoring system has good access function of hardware and software, and the hardware and software have good openness, which ensures the interconnection between the power supply system and other systems and the system expansion.
Anti interference
The external interface design of the main equipment of the power supply system adopts special anti-static, anti-high-voltage pulse train and lightning protection design. All electrical equipment are reliably grounded. The software adopts self diagnosis measures and adopts super isolation technology to effectively prevent electromagnetic wave, radio and static interference from intruding into the main equipment of the power supply system, so as to avoid damage and misoperation of the system equipment.