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2022-03
Some tips for switching power supplies of medical equipment, do you know
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Do you know some maintenance skills for switching power supplies of medical equipment? With the high development of medical electronic technology, there are more and more types of medical equipment, and the relationship between medical equipment and modern medical diagnosis and treatment is increasingly close, and any medical equipment is inseparable. Safe and stable power supply, and most of them are switching power supplies. In the process of daily diagnosis and treatment, it is often encountered that equipment cannot be used due to power failure. At this time, clinical medical engineers of medical service institutions are required to combine their own experience and professional knowledge to provide rapid and efficient services to clinical departments. Due to the particularity of medical equipment, the interchangeability of equipment power supply is poor, and some even lack technical drawings, which brings great inconvenience to maintenance work.
Switching power supplies for medical equipment can generally be divided into two categories: AC/DC and DC/DC. The input of the AC/DC converter of the primary power supply is 50/60Hz, 220V AC, which must be rectified and filtered. Larger filter electrolytic capacitors cannot be used. less, and the AC input must be added with EMC filtering and the use of safety standard devices. The secondary power supply DC/DC converter is used for power conversion. It is the core part of the switching power supply. In addition, there are circuits such as startup, overcurrent and overvoltage protection, and noise filtering. The output sampling circuit detects the output voltage change and compares it with the reference voltage. The error voltage is amplified and pulse width modulated (PWM) circuit, and then the drive circuit controls the duty cycle of the power device, so as to achieve the purpose of adjusting the output voltage.
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