Consumer electrical equipment is used everywhere in our daily lives and is often driven by common operators (such as 3D printers in a factory, mass spectrometry analyzers in a laboratory, or mobile medical carts in a hospital). These electrical equipment often have several electrical components integrated for their operation. For example, a 3D printer consists of a motor for printing, an LCD screen for display and control, sensors to drive the printer head, and heating elements, etc. These peripheral components operate with different DC voltages, requiring multiple AC/DC power supplies, which often causes the equipment to not meet the low earth leakage current (500Μa – 750μA) requirement set by electrical standards. safety, because the equipment earth leakage current is the total earth leakage current of each AC/DC power supply. Since the person who handles this equipment is a common operator, regulatory compliance establishes such a low leakage current, thus minimizing the danger for said operators.
To meet the requirement of low leakage current, a multi-output AC/DC power supply is used, because it consists of only one front output and multiple outputs that can be configured to meet the voltage and power requirements of the drivers. peripheral components. Figures 1 and 2 show the leakage current test results of the MEAN WELL Modular Power Supplies: NMP1K2-HHEKC # -01, consisting of four outputs of 5V, 12V, 24V, and 48V, and the total leakage current. four power supplies: MSP-600-24, MSP-300-48, MSP-300-12 and MSP-100-5. The earth leakage current of the NMP1K2-HHEKC # -01 is found to be 234μA at 230Vac, which is much less than the total earth leakage current of 856μA of the four MSP power supplies. Therefore, the NMP1K2-HHEKC # -01 leakage current meets the 500μA – 750μA leakage current requirement of consumer electrical equipment.
In addition to meeting the leakage current requirement, a configurable multiple output power supply allows us to save space due to its compact size and favoring the system design, occupying less. It also simplifies input (AC) wiring to reduce electromagnetic interference (EMI) in equipment, and limits the need for EMI scrubbing compared to using multiple power supplies, which often require an additional EMI filter. , to pass the electromagnetic interference tests. MEAN WELL's NMP series is an intelligent and configurable power supply with high performance, high reliability and compact (1U height). Not only does it have multiple independent configurable outputs, but it is also certified to ITE 62368-1 and 60601-1 industrial and medical safety standards, respectively, with an earth leakage current of less than 400μA. Therefore, the NMP series has all the advantages over multiple power supplies for consumer electrical equipment and other medical equipment.
