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Special requirements for sockets with USB power supply
A socket with USB power supply (usually referred to as a USB socket or smart socket) not only meets the basic requirements of traditional sockets, but also requires additional testing and evaluation for the special characteristics of the USB power supply module. The following is a detailed explanation of the special requirements and related testing items for this type of socket:
1. Logo
USB identification: Clearly label the output parameters of the USB port (such as 5V/2.4A).
Double marking: Simultaneously indicate the rated parameters of the AC socket and USB port.
Durability: The logo should undergo a wipe test (such as wiping with a damp cloth for 15 seconds) to ensure its durability.
2. Dimensional gauge inspection
Socket size: Ensure that the dimensions of the AC socket and USB port comply with relevant standards (such as IEC 60884, GB 2099, etc.).
USB port size: The USB port should comply with the USB-IF standard (such as USB-A, USB-C, etc.).
3. Anti electric shock protection
USB port protection: USB ports should be designed for low voltage output (≤ 60V DC) to ensure that users will not be electrocuted.
AC socket protection: The AC socket part should meet the anti electric shock requirements of traditional sockets (such as protective door design).
4. Grounding resistance test
Grounding continuity: Test the continuity of the grounding terminal of the AC socket to ensure that the grounding resistance meets the standard requirements (usually ≤ 0.1 Ω).
USB grounding: The grounding of USB ports should comply with the safety requirements of low-voltage circuits.
5. Fixed socket structure
Installation method: Provide reliable installation methods (such as screw fixation, embedded installation, etc.).
USB module fixation: Ensure that the USB power module is securely fixed inside the socket.
6. Structure of plugs and mobile sockets
Shell strength: The shell should be able to withstand mechanical impact and pressure.
Flexible wire fixing device: Mobile sockets should be equipped with flexible wire fixing devices to prevent wires from being pulled off.
7. Aging resistance and protection provided by switch housing (IP)
Aging resistance test: Conduct aging tests in high temperature environments to ensure stable material properties.
IP protection level: Choose the appropriate IP level (such as IP20, IP44, etc.) based on the usage environment.
8. Insulation resistance and electrical strength
Insulation resistance test: Measure the insulation resistance of AC sockets and USB ports to ensure compliance with standard requirements (usually ≥ 100M Ω).
Voltage withstand test: Conduct a voltage withstand test at a specified voltage (such as 1500V AC) to ensure no breakdown or flashover.
9. Temperature rise
Temperature rise test: Test the temperature rise of the AC socket and USB port under rated load to ensure that it does not exceed the specified limit.
Thermal protection: Built in thermal protection device to prevent damage caused by overheating.
10. Breaking capacity
Breaking ability test: Test the breaking ability of the AC socket at rated current to ensure that it can safely disconnect the circuit.
11. Normal operation
Plug and unplug test: Simulate normal plug and unplug operations to test the durability of AC sockets and USB ports (e.g. ≥ 10000 times).
Load testing: Test the performance of AC sockets and USB ports under rated load.
12. The force required to unplug the plug
Pull out force test: Measure the force required to pull out the plug, ensuring it is within the specified range (usually 5-40N).
13. Flexible cords and their connections
Soft wire fixing device: Ensure that the soft wire fixing device can withstand the specified tensile force (such as 30N).
Connection reliability: Test the connection reliability between the flexible cord and the plug or socket to prevent loosening.
14. Mechanical strength
Impact testing: testing the reliability of the socket under mechanical impact.
Pressure testing: Apply specified pressure to test the mechanical strength of the casing.
15. Heat resistance (ball pressure)
Ball pressure test: Conduct a ball pressure test in a high-temperature environment to ensure that the material does not deform or soften.
16. Screws, current carrying components, and connections
Torque test: Test the torsional strength of screw connections.
Current carrying capacity: Ensure that current carrying components can withstand rated current without overheating.
17. Creepage distance, electrical clearance, and sealant penetration distance
Creepage distance: Determine the creepage distance based on the voltage level to prevent leakage.
Electrical clearance: Ensure that the minimum distance between live parts meets the standard.
Sealing distance: Ensure the thickness and uniformity of the sealing glue.
18. Insulation materials' resistance to abnormal heat, flame, and electrical traces
Heat resistance test: testing the stability of materials at high temperatures.
Flame retardant test: Test the flame retardant rating of materials according to standards such as UL94.
Tracking resistance: Test the tracking resistance of materials under leakage conditions.
19. Rust prevention performance
Salt spray test: Testing the corrosion resistance of metal components in a salt spray environment.
20. Additional test for pins with insulation sheath
Insulation sheath strength: Test the mechanical strength and electrical performance of the insulation sheath.
Wear resistance test: Simulate insertion and extraction operations to test the wear resistance performance of the insulation sheath.
Special requirements for USB power supply module
Output voltage and current:
Ensure that the output voltage and current of the USB port comply with the USB-IF standard (such as 5V/2.4A).
Short circuit protection:
USB ports should have short-circuit protection function to prevent damage to equipment or fire in case of short circuit.
Overload protection:
USB ports should have overload protection function to prevent device damage in case of overload.
Ripple and noise:
Test the output ripple and noise of the USB port to ensure compliance with standard requirements.
Efficiency testing:
Test the conversion efficiency of the USB power module to ensure compliance with energy efficiency standards such as DoE Level VI, CoC Tier 2, etc.
summary
A socket with USB power supply needs to meet the dual requirements of both traditional sockets and USB power modules. To ensure the safety and reliability of the product, it is recommended to strictly follow relevant international standards (such as IEC 60884, GB 2099, USB-IF standards, etc.) for design and testing. Through comprehensive testing and certification, it can be ensured that the product is competitive in the market and meets user needs.
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