Device designers have been demanding SMPS with smaller packages. The smaller EMI filter not only effectively reduces the magnitude of the electromagnetic emissions before they reach the main line, but also reduces the volume of the main line filter. The modular SMPS gives designers greater flexibility in designing medical devices . In the redesign or upgrade process, the original SMPS can be replaced with a higher power level modular SMPS without the need to redesign the electromechanical systems that support the SMPS and equipment.
Reduce the level of conducted emissions using a base noise filter
Under the combination of the base noise filter and the conductive line filter, the substrate noise is introduced into the ground through a conductive line filter, which is effectively reduced before the substrate noise enters the grounding system of the building. As a result, the noise in the building setup is reduced. At the same time, in some cases, the use of a substrate noise filter can reduce electromagnetic emissions at the input conductors of the conductive line filter, which also reduces the size of the line filter.
The base noise filter is placed between the overall system ground and the line filter ground. This placement will reduce the electromagnetic emissions at the input of the line filter and reduce the electromagnetic emissions introduced into the ground conductor. Both methods can reduce the leakage current of medical devices (this current is often difficult to control because additional filtering in the line filter will generate more leakage current).
A microcomputer noise filter is used for the microcomputer in the electronic medical device. The base noise filter is used here to isolate the noise generated by the microcomputer so that it does not affect the rest of the circuit, and vice versa. This setup effectively breaks the high frequency ground loop in the circuit.
Substrate noise in medical facilities The noise floor in a medical facility often affects the operation of imaging sensitive electronic medical devices such as ultrasound equipment, magnetic resonance imaging equipment (MRI), and computed tomography equipment (CT).
To improve image quality, field engineers sometimes spend a lot of time looking for grounding problems and/or substrate noise problems. Subsystem equipment is sometimes replaced if it is not possible to determine if the substrate noise will affect the image quality. With the replacement of expensive imaging components, the use of a substrate noise filter to improve image quality can be more cost effective. Additionally, the use of a substrate noise filter on the ground of the imaging system can reduce noise (generated by the imaging system) into the facility grounding system.
Base noise noise within the medical facility will enter the facility and propagate within the facility's grounding system. Substance noise can also occur in all equipment within the facility, and these noises will collect at the facility ground point and will reach extremely high noise levels. The cycle of substrate noise can also occur between different switchboards, between different devices, between switchboards and devices, which can eventually lead to EMI problems within the device. Using one or more base noise filters in a facility grounding system will be very effective in reducing EMI problems, as shown in Figure 6.
in conclusion
As medical device technology advances and medical facilities expand, new methods are needed to reduce the magnitude of conducted emissions. Many medical facilities need to address serious substrate noise problems. The strategic use of one or more base noise filters will reduce substrate noise within the medical facility and will eliminate the substrate noise loop. The strategic placement of the filter will reduce the chance of EMI problems and/or increase the chances of solving existing EMI problems. The reduction in the volume of the conductive line filter saves equipment space, reduces weight and reduces costs. There are many locations in the circuit design where the substrate noise filter can be placed, and many related experiments and studies are currently underway. These experiments and research will make it possible to achieve more effective diagnosis and patient care in medical facilities around the world.
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