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Medical equipment power analysis and medical power selection criteria
time2019/07/01
- Nowadays, due to the improvement of medical level, more and more advanced medical equipment is widely used in various medical situations. Because of the special nature of medical equipment, as an important part of it, medical power supplies have more stringent requirements than other power products. Currently, medical devices are more commonly used as switching power supplies.
Nowadays, due to the improvement of medical level, more and more advanced medical equipment is widely used in various medical situations. Because of the special nature of medical equipment, as an important part of it, medical power supplies have more stringent requirements than other power products. Currently, medical devices are more commonly used as switching power supplies.
With the development of electronic technology, the switching power supply not only greatly reduces the size, but also reduces the weight, and also greatly reduces the energy consumption and improves the reliability. It can be said that the development of medical power has also greatly promoted the development of medical equipment. So, what is the development process of medical power supply? What special requirements does it have in terms of safety? How do we choose medical power supply?
Medical AC/DC and DC/DC power supplies are divided into linear power supplies and switching power supplies. Most medical devices currently use switching power supplies, and AC/DC linear power supplies are rarely used. In the past 20 years, switching power supplies have developed rapidly, efficiency has increased from 70% to over 90%, switching frequency has been improved, magnetic components and components have been greatly reduced in size, switching topology has been continuously developed, and packages have been developed from through-holes to SMDs. The more miniaturized, and the emergence of planar magnetic components, multilayer PCBs.
Until now, most medical power supplies have been digitally controlled, which reduces the number of parts and increases flexibility. On top of the key technologies, medical power supplies now use new semiconductors, which reduce RDS (on-resistance) while reducing gate charge/capacitance, making switching faster, and the benefits of digital control are reduced cost and increased yield. Reducing the number of parts increases reliability and flexibility, adding new features to add as much value as possible. Moreover, the specifications for power density and convection heat dissipation technology of medical power sources are constantly increasing.
The safety of medical power supplies is a problem that must be faced. Now the power supply mainly has two major safety certifications, the information technology equipment IEC 60950-1 and the medical equipment IEC60601-1. The medical equipment may be in contact with the patient, so the safety level is higher. At present, there are three major safety standards for medical power sources in the world, namely ANSI/UL ES 60601-1 in the US, CAN/CSA C22.2 No.606.1 in Canada, and EN 60601-1 in the European Union (BS EN 60601- in the UK). 1).
So, how to choose medical power supply? Customized medical power supply can be designed and manufactured according to the specified specifications. Many power supply suppliers provide technical support; there are many kinds of standard medical power supplies, which are available from many manufacturers. He also talked about their respective strengths and weaknesses, as well as the specific power source to choose from. In the early stage of medical power supply design, the power requirements should be defined and determined as early as possible. The power supply specifications should be formulated according to the requirements of the terminal medical system. If allowed, standard medical power supplies can be used, and other methods can be considered.
Nowadays, there are more and more merchants producing medical power. Everyone knows that the market price will drop if the supply is large. More and more medical power manufacturers have also caused the quality of medical power to be uneven, like the market price. Very low medical power is recommended for small partners not to buy.