1. Comparison of Core Technical Parameters

　　Medical-grade 300W switching power supplies must meet stringent patient safety and equipment compatibility standards, with key parameters of mainstream products focusing on isolation performance and low-interference characteristics (information integrated from technical whitepapers of multiple medical power supply brands):

　　XP Power DMS300 Series: Features an input range of 85-264VAC (wide-range adaptation for global power grids), with digitally programmable output voltage adjustable between 12-48V DC and corresponding rated current of 6.25-25A. Core safety indicators reach 2×MOPP isolation level (4kVAC isolation voltage), with patient leakage current ≤10μA (meeting Class CF equipment requirements) and efficiency up to 93%. Equipped with short-circuit, overload (constant current limiting mode), and overtemperature (shutdown at 95℃) protection, it includes a PMBus digital monitoring interface, ripple and noise ≤50mVp-p, and operating temperature range of -20~+70℃.

　　TRACO TIM300 Compact Type: Compatible with 85-264VAC input, offering dual output specifications of 12V/25A and 24V/12.5A. It has 4kVAC isolation voltage (2×MOPP certified) and earth leakage current <50μA (suitable for Class BF equipment). Efficiency ranges from 88% to 90%, ripple and noise ≤100mVp-p, and it adopts a fanless natural convection cooling design (dimensions: 177×119×39mm) supporting wide-temperature operation of -40~+70℃. Protection functions include short-circuit (auto-recovery), overload, and overvoltage, complying with IEC 60601-1 Edition 4.

　　RECOM RACM300-G: Accepts 85-264VAC input and provides 24V/12.5A output, with 4kVAC reinforced isolation (2×MOPP) and patient leakage current ≤10μA. Efficiency reaches 92%, and it features redundant current sharing function (supporting N+1 parallel connection). Ripple and noise ≤80mVp-p, with temperature-controlled fan cooling (noise ≤30dB), overtemperature protection triggering at 85℃, MTBF of 500,000 hours, and operating temperature range of -10~+60℃.

　　2. Key Selection Criteria for Medical Equipment Adaptation

　　2.1 Safety Class Matching Principle

　　Select based on equipment contact type:

　　Class CF equipment (direct cardiac contact, e.g., cardiac monitors): Requires leakage current ≤10μA and 2×MOPP isolation (e.g., XP Power DMS300)

　　Class BF equipment (contact with human mucous membranes, e.g., ultrasound probes): Requires leakage current ≤100μA and 1×MOPP isolation (e.g., TRACO TIM300)

　　Non-contact equipment (e.g., analyzers): Leakage current can be relaxed to ≤500μA

　　2.2 Isolation and Electric Shock Protection Design

　　Must meet the following requirements:

　　Isolation voltage ≥4kVAC (per IEC 60601-1)

　　Reinforced insulation resistance ≥100MΩ (tested at 500VDC)

　　Double insulation structure to avoid electric shock risks from single-point failures

　　2.3 Mandatory EMC Requirements

　　Must pass EN 55032 Class B conducted/radiated emission tests, as well as IEC 61000-4-2 (ESD) and IEC 61000-4-4 (electrical fast transient) immunity tests to prevent interference with sensitive equipment such as ECG monitors and pacemakers.

　　2.4 Comprehensive Safety Certifications

　　Global market coverage required: UL 60601-1 (North America), EN 60601-1 (Europe), GB 9706.1 (China National Standard). Class CF equipment additionally requires IEC 60601-1-2 Edition 4 certification.

　　3. Mainstream Products and Application Scenarios

　　XP Power DMS300: Key advantages include digitally programmable output (12-48V adjustable), ultra-low leakage current (≤10μA), and PMBus monitoring function. Suitable for mobile monitors and portable ultrasound diagnostic equipment, it is a high-end customized solution with a reference price of \(450-\)500 and 5-year warranty.

　　TRACO TIM300: Highlights include compact fanless design (only 39mm thick) and wide-temperature operation (-40~+70℃). Adaptable for operating room embedded equipment (e.g., high-frequency electrosurgical unit auxiliary power supplies) and outdoor emergency equipment. Priced at approximately \(300-\)350, it supports PCB direct soldering installation.

　　RECOM RACM300-G: Advantages include redundant current sharing support (parallel connection for power expansion) and quiet cooling (30dB). Suitable for life-support equipment (e.g., ventilators, hemodialysis machine auxiliary power supplies), it is a high-reliability solution with a reference price of \(350-\)400 and MTBF of 500,000 hours.

　　4. Key Design and Application Considerations

　　4.1 Leakage Current Control and Testing

　　Leakage current must be measured at the complete equipment level: current between patient contact terminals and protective earth ≤10μA (Class CF), and current between power input terminal and earth ≤0.25mA. It is recommended to connect a leakage current limiting resistor (100kΩ/2W) in series and calibrate monthly using a medical-specific leakage current tester .

　　4.2 Isolation and Grounding Design

　　Adopt an independent floating ground structure, with primary-secondary grounding resistance ≤0.1Ω and secondary circuit-chassis insulation resistance ≥50MΩ. Parallel-connected multiple devices must share a single-point grounding to avoid interference from ground loops .

　　4.3 Maintenance and Compliance Assurance

　　Conduct insulation strength tests every 6 months (applying 4kVAC for 1 minute without breakdown); clean dust filters of fan-cooled models quarterly (e.g., RECOM RACM300-G) to prevent overtemperature protection triggering due to dust accumulation. Lithium battery backup power supplies must link with medical-grade power supplies, with switching time ≤10ms (meeting IEC 60601-1-2 backup power requirements).

　　4.4 Redundancy Configuration Techniques

　　N+1 redundant design is recommended for life-support equipment (e.g., 2 units of 300W power supplies in parallel for 450W load). Achieve load balancing through current sharing resistors (0.1Ω/5W) with automatic switching in case of failure, and switching time <5ms .

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