Selecting a suitable U-shaped bare board power supply requires considering core factors such as the device's power requirements, installation space, and operating environment, combined with key indicators such as power supply performance and safety. The specific steps and key points are as follows:

1. Matching core electrical parameters to meet basic power supply needs:

• Determining voltage and current: First, clarify the rated output voltage (such as common specifications like 5V, 12V, 24V, etc.) and the maximum operating current required by the device. Then, calculate the device power using the power formula (Power = Voltage × Current), and ensure that the power supply's rated power has a 20%-30% margin. For example, if the device requires 60W of power, a power supply of 75W or higher should be selected to avoid overheating and shortened lifespan due to full-load operation, and to handle the instantaneous peak current during device startup. If the device requires multiple power supplies (such as simultaneously requiring +12V and +5V), the power distribution of each output of the power supply must also be checked for compatibility.

• Adapting to the input voltage range: For use in home or office environments, prioritize power supplies with a wide input range of 85-264V AC to adapt to fluctuations in the domestic 220V power grid; for special scenarios such as in-vehicle or industrial equipment, the corresponding DC input specifications must be matched (such as 12V for vehicles, 380V three-phase for industrial use) to prevent power supply failure or damage due to incompatible voltage.

2. Checking performance indicators to ensure stable device operation:
• Focusing on output stability: The higher the accuracy requirements of the device's power supply, the more important it is to consider the power supply's ripple and noise, and voltage regulation rate. For sensitive equipment such as medical testing instruments and precision sensors, a power supply with ripple noise below 50mVpp should be selected to avoid interference with the accuracy of device data; for ordinary equipment, this can be relaxed to within 100mVpp. At the same time, the voltage regulation rate should be controlled as much as possible within ±1% to ensure stable output voltage when the input voltage or load changes.

• Prioritizing high-efficiency models: Power supplies with higher efficiency have lower energy loss and heat generation, and a longer lifespan. For devices that operate for extended periods (such as NAS servers and industrial control modules), it is recommended to choose power supplies with 80 PLUS Bronze certification or higher, whose conversion efficiency is usually above 85%, which can save electricity costs and reduce heat dissipation pressure.

3. Matching Installation Dimensions and Fixing Methods
One of the core advantages of U-shaped open-frame power supplies is their adaptability to compact spaces. When selecting a power supply, it is necessary to accurately measure the dimensions (length, width, and height) of the installation area inside the equipment. For example, small IT equipment such as soft routers with Mini-ITX motherboards require a small U-shaped open-frame power supply suitable for 1U rack mounting; for equipment in industrial control cabinets, it is necessary to confirm whether the power supply's mounting holes and fixing methods (such as screw fixing or snap-in) match the reserved space in the equipment to avoid installation problems due to incompatible dimensions.

4. Selecting Suitable Features Based on the Operating Environment
• Addressing Temperature and Protection Requirements: For outdoor traffic monitoring, logistics tracking equipment, etc., choose a power supply with a wide operating temperature range (such as industrial-grade -40°C to +85°C), and check the power derating curve to ensure that the power supply can still meet the power supply requirements in high-temperature environments; if used in humid and dusty environments, pay attention to the power supply's dustproof and waterproof rating (such as IP67) to prevent dust and moisture from damaging power supply components.

• Considering Anti-interference and Anti-vibration: In industrial workshops, roadsides, and other environments prone to vibration or electromagnetic interference, prioritize U-shaped open-frame power supplies with reinforced frames and built-in filters. This can prevent components from loosening due to vibration and reduce the impact of electromagnetic interference on the equipment and the power supply itself.

5. Ensuring Safety and Certification to Avoid Usage Risks
• Confirming Essential Protection Functions: High-quality power supplies must have overcurrent, overvoltage, short-circuit, and overtemperature protection functions. Overcurrent/short-circuit protection prevents damage to the power supply and load in case of equipment failure and short circuits; overtemperature protection prevents the power supply from overheating and catching fire. These functions are crucial for ensuring safe use and are indispensable.
• Verifying Corresponding Safety Certifications: Different scenarios have different certification requirements. Power supplies sold and used domestically require CCC certification; those exported to the EU require CE certification, and those exported to the United States require UL certification. If used in medical equipment, a medical-grade power supply that complies with the IEC 60601 standard must be selected. These power supplies have higher isolation levels and lower leakage current to avoid high-voltage conduction that could pose a safety risk to humans. 6. Balancing Special Needs and Brand Assurance
• Adapting to special functional requirements: If the equipment needs to operate unattended, consider power supplies with remote switches and status feedback for convenient remote monitoring of the power supply status. If there are customized requirements (such as special interfaces or pin definitions), choose manufacturers that offer customization services.
• Prioritizing reliable brands and after-sales service:  Whenever possible, choose well-known brands such as Mean Well and Mornsun. These products typically have a mean time between failures (MTBF) exceeding 100,000 hours, offering higher reliability. Also, ensure the manufacturer can provide detailed specifications, test reports, and comprehensive after-sales service to avoid unresolved issues later on.