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? What special requirements does it have for security? How do we choose a medical power supply?
To this end, on October 30th, the "OFweek 2016 China Internet Medical Health Industry Conference" hosted by China's high-tech industry portal and "OFweek Medical Network", Mr. Liang Hui, application engineering manager from Artesyn Technology, The series of questions made a keynote speech on “The Elements of Medical Power Designâ€.
Yatson Technology Application Engineering Manager Liang Hui
Mr. Liang Hui first gave us the process of continuous development and progress of medical power. He said that 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. In 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 supplies are constantly increasing.
The safety of medical power supplies is a problem that must be faced. Mr. Liang Hui mentioned that there are two major safety certifications for power supply, information technology equipment IEC 60950-1 and medical equipment IEC 60601-1. Medical equipment may come into contact with patients, 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 United States, CAN/CSA C22.2 No. 606.1 in Canada, and EN 60601-1 in the European Union (BS EN 60601- in the UK). 1). Mr. Liang Hui also talked about AC leakage current, medical equipment certification standard ISO13485, as well as classification and regulatory elements of medical equipment, as well as electrical requirements, mechanical requirements and environmental, safety and regulatory issues for medical power supplies.
So how do you choose a medical power supply? According to Liang Hui, custom medical power supplies can be designed and manufactured according to specified specifications. Many power suppliers provide technical support. There are many types of standard medical power supplies available from many manufacturers. He also talked about their respective strengths and weaknesses, as well as the specific power source to choose from. He concluded that in the early stage of medical power supply design, the power requirements should be defined and determined as early as possible, and the power supply specifications should be formulated according to the requirements of the terminal medical system. If allowed, standard medical power sources can be used, and other methods can be considered.
For more content of the conference, please pay attention to the post-meeting special report .
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