Today, customers have many more options, and one of the best choices is to select the MEAN WELL NMP650/1K2 series or UMP-400 series medical-grade modular power supplies, both medical-grade certified and distributed by Olfer Electronics.
The UMP-400 series is a low-profile (1U) modular power supply. Its flexible, modular design makes it a unique power supply on the market. It can be used not only as a single-output power supply but also as a multi-output power supply by installing the available NID35/65/100 series DC-DC converters on the UMP-400 PCB.
The UMP-400 series, in its standard configuration, provides only one output channel, either 24V or 48V. If you require multiple output channels, please contact MEAN WELL; they can provide customized services immediately. Up to four output voltage channels can be provided to meet the needs of various equipment or applications requiring multiple outputs.
The NMP650 and NMP1K2 series are medical-grade power supplies with independent output modules and an ultra-wide output voltage range. This allows users to configure and modify the output voltage, current, and power according to their needs. The NMP series is equipped with intelligent control functions, such as voltage and current control, remote power on/off, overheat warning, and a DC-OK signal, providing remote control and monitoring options. The fan speed is automatically adjusted via its internal temperature sensing function for temperature control. The miniaturized (1U) design significantly increases power density. Regarding certifications, the NMP series complies with medical (60601-1) and industrial (TI 62368-1) safety regulations. Multiple functions and high quality meet the demands of all industries. With a five-year warranty and quality verification, the NMP family is a high-performance, reliable, multi-module intelligent power supply.
Key reasons why we recommend our medical-grade power supplies, UMP-400 and NMP series:
1. Low ground leakage current requirement.
Medical equipment typically contains several components, such as a 3D printer, an LCD screen for display and control, sensors to guide the print head, and heating elements. These peripheral components operate at different DC voltages, requiring multiple AC/DC power supplies. This often results in the equipment not meeting the low ground leakage current requirement (500μA-750μA) established by safety standards, because the equipment's ground leakage current is the sum of the leakage currents of each AC/DC power supply. Regulatory compliance mandates a low leakage current to minimize hazards to operators handling this equipment. To meet the low leakage current requirement, a multi-output power supply is used. This type of power supply consists of a single front end and multiple outputs that can be configured to meet the voltage and power requirements of the peripheral components.
Figures 1 and 2 show the leakage current test results for the MEAN WELL NMP 1K2-HHEKC #-01 device, which consists of four outputs of 24V, 12V, 48V, and 5V, and the total leakage current of four power supplies: MSP-600-24, MSP-300-12, MSP-300-48, and MSP-100-5.
The ground leakage current of the NMP 1K2-HHEKC #-01 is 234 μA at 230 V AC, significantly lower than the total ground leakage current of 856 μA of the four MSP power supplies. Therefore, the leakage current of the NMP 1K2-HHEKC #-01 meets the 500 μA–750 μA leakage current requirement for consumer electrical equipment.
Figure 1: Leakage current of 138uA below 120Vac - Leakage current of 234uA below 230Vac
Figure 2: Leakage current of 476uA below 120Vac - Leakage current of 856uA below 230Vac
2. High Output Voltage Accuracy:
Most users expect to choose the "most convenient power supply," where the output voltage of each channel remains accurate as long as the input and output changes of the selected power supply do not exceed the nominal parameter. However, most multi-output power supplies are unsatisfactory; therefore, choosing the UMP and NMP series is your best option.
As shown in Figure 3, a UMP-400-48 is configured with one NID100-15 and one NID100-12, for a total of three outputs.
From the test data in Table 2, the voltage accuracy of each group can reach ±0.5%. This meets the voltage accuracy requirements for most electronic equipment.
Figure 3. Voltage Test of the UMP-400-48KJ.
As shown in Figure 4, the UMP-400 series offers multiple configurations. However, due to the design of the NID modules, some notes are necessary.
1. The NID modules are designed with a non-isolated buck converter. The input voltage must be higher than the output voltage; the NID35/65/100-24 modules should function when paired with a 48V front-end.
2. Only channel 4 (V4) can be used as a negative output voltage. As shown in Figure 5, when the NID35/65/100 is selected as a negative voltage, this input voltage must be less than 30V DC; therefore, only the UMP-400-24 module can be used.
Author: Willard Wu /Technical Dept.
Translation: Olfer Electronics Marketing Department.
