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Articles by Gary Bocock
XP Power: När patienten är elektriskt kopplad till instrumentet
Isolering, läckström, beröringsström, EMC, användningsmiljö och antalet effektutgångar – den här artikeln går igenom vad du behöver tänka på när du konstruerar strömförsörjning till ett instrument som kan stå i elektrisk kontakt med patienten. Det heter att sådan utrustning har applicerade delar (”applied parts”). För att vara riktigt noga gäller denna beteckning bara de kontaktytor som har med apparatens funktion att göra.
Modular EMI Filter Selection for AC-DC Converters
Modular AC line filters are often seen in end-equipment, either chassis-mounted or integral to Heading 5 a connector, particularly in environments such as ITE, healthcare, and industrial electronics. The purpose of the filter is to attenuate emissions that originate from the equipment from a combination of power supplies, internal electronics, high-speed data lines, etc.
Modular EMI AC Line Filters
Figure 1: This typical modular EMI filter uses the CX capacitors to attenuate differential mode noise and an inductor-capacitor combination to reduce common mode noise. Capacitor CX attenuates differential mode noise, signals, and spikes that appear from line to neutral created by rapid changes in current within the converter. Capacitors will be rated as X1, X2, or X3 for their ability to withstand voltage transients on the AC line.
Match modular EMI AC line filters to application’s DC supply needs
For AC mains-powered equipment, it’s common practice to use a modular AC line filter fitted either integral to a connector or as a chassis mount part, particularly in professional environments such as industrial, healthcare, and ITE. The equipment typically includes an embedded AC-DC converter, or power supply, which might also be chassis-mount or sometimes rack- or PCB-mounted.
Digital power: Challenges and opportunities for power designs
July 26th, 2019, Published in Articles: EngineerIT, Featured: EngineerIT by Gary Bocock, XP Power Digital power has experienced rapid growth over the last five years, taking advantage of the many benefits that digital control can bring to a traditionally analogue domain. The increasing adoption of digital control has been supported by the many new products from microcontroller vendors which specifically target the digital power market.
Installing open frame and U-channel PSUs for safety and performance
Many (if not most) AC/DC power supply units (PSUs) are delivered in an open frame format, meaning that they are not fully enclosed. As they are typically installed inside equipment, this approach allows any forced air cooling to be used most efficiently and save cost. As these devices require professional installation, they are considered to be components and, therefore, rely on the product housing for safety and to protect them from the elements.
Electrolytic capacitor lifetime in power supplies
The service life of these electrolytic capacitors is an increasingly key design parameter in power supplies Electrolytic capacitors are an essential ingredient in AC/DC power supplies, providing high Capacitance x Voltage (CV) and low Equivalent Series Resistance (ESR) in low-volume packages that simply cannot be achieved cost-effectively using alternative parts.
Safety of Household and Similar Electrical Appliances - How EN 60335 Compares
EN 60335 Part 1 defines how household and similar electrical appliances can meet the overall requirements of the ‘Low Voltage Directive’ and other legislation When designing to meet the requirements of EN 60335, engineers have to adopt a different mind-set. Compared with the familiar IT and medical standards, not only are some design limits different but also the potential users and end products are much more varied.
Power Systems for Medical Equipment Must Ensure Patient Safety
Medical electrical equipment that comes into contact with patients is that it must be safe A fundamental tenet of medical electrical equipment that comes into contact with patients is that it must be safe to use, both for the patient and the operator.
Installing Open-Frame and U-Channel AC-DC Power Supplies
Download this article in PDF format. Engineers must be wary of safety, electromagnetic-compatibility, and thermal-management factors when installing open-frame and U-channel power supplies. Typically, power supplies are supplied in what is known by the industry as an open-frame format. Open frame generally describes a PCB-only-construction, component power supply designed to be installed into an end-equipment application that provides the enclosure for the entire product (Fig. 1). 1.
Powering patient-connected equipment
This paper discusses two approaches for power systems within medical equipment for patient-connected applications. The part of the equipment that comes into contact with the patient is known as the ‘applied part’. The applied part is defined as the part of a medical device which, to enable the overall device to perform its function, deliberately comes into direct contact with a patient. This also applies to parts likely to come into contact with the patient.
Product How to: Power Systems for Patient-Connected Equipment
This paper discusses two approaches for power systems within medical equipment for patient-connected applications. The part of the equipment that comes into contact with the patient is known as the ‘applied part’. The applied part is defined as the part of a medical device which, to enable the overall device to perform its function, deliberately comes into direct contact with a patient. This also applies to parts likely to come into contact with the patient.
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