Technical Discussion on Temperature Performance and Safety of Avalon Nano3 Power Adapter

Dear Avalon Nano Users,

Recently, through customer service, we’ve noticed that some users have raised concerns about the surface temperature of the Avalon Nano3 power adapter during operation. We take user feedback and experience very seriously, so we’ve conducted additional internal testing. In this document, we provide detailed technical discussions and explanations of the product features and test results to help distinguish between normal conditions and potential quality issues, ensuring you have peace of mind.

I. Problem Description

Some users have reported that the power adapter becomes quite hot to the touch during operation, raising concerns about whether the product can continue to operate safely and reliably. We fully understand these concerns and take them seriously. However, it's important to note that the Avalon Nano3 power adapter is designed and tested according to multiple international safety standards.

 For example, under the CCC 2021 certification, the maximum allowed surface temperature of the adapter is 77°C (previously 95°C), while UL60950 permits a plastic shell temperature of up to 95°C.

Different users may perceive heat differently, and a temperature of 77°C can certainly feel hot to the touch. This discomfort is understandable and should be taken seriously. To address these concerns and provide users with detailed technical data, we have conducted thorough testing and analysis on the adapter.

II. Product Specifications and Completed Tests

A： Key product specifications

• Output power: maximum 140W (maximum 28V 5A)
• Operating temperature range: 0 ℃ -40 ℃
• Operating environment requirements: The maximum ambient temperature is 40 ℃. Do not cover the adapter.

B:  Standard Certification

• This product has passed UL, CCC, CE certifications.

C： Testing process details

• Test A

Test environment: ambient temperature 25℃, operating output power: 140W (greater than the actual usage load of about 127W).

Test results

Using a thermal imaging camera, the highest temperature recorded at the top of the power supply was approximately 50.2℃, and at the back, it was about 46.7℃, in a 25℃ environment. Both 50.2℃ and 46.7℃ are far below the temperature standards of CCC/UL, indicating better-than-required performance.

• Test B

Test environment: Ambient temperature 35°C, operating output power: 140W (greater than the actual use load of about 127W)

After two hours of continuous operation, the temperature was recorded: the highest temperature of the test shell was 65.40°C, which is better than the temperature rise value of the mandatory standard (the shell temperature must not exceed 77°C at 30°C). The test environment and test results are shown in the below pictures.

• Test on Output current quality

We conducted tests and found that the power adapter's output current quality was minimally affected by rising temperatures.

At cold condition, the power ripple measured 122mV. After two hours of aging, the ripple dropped to 89.6mV (as the ESR value of the capacitor decreases with rising temperatures, leading to lower ripple at higher temperatures). The output voltage decreased by about 30mV. The test environment and ripple test waveform are shown in the pictures below:

III. Reminder of Maintenance and Application Requirement

Here we'd like to remind all Nano 3 users to use it within the maximum ambient temperature and do not cover the adapter.

We have randomly inspected some adapters that have recently been used beyond their range and conducted a series of protection function tests, including over temperature operation (outputting 140W power for a long time at an ambient temperature of 45 degrees Celsius), over power, short circuit protection, etc. The test results indicate that in these cases, the adapter can successfully activate various protection functions to ensure user safety.

• test results of over-temperature operation:

Over-temperature operation: Due to variations between devices, the adapter may trigger output protection when operating at 45°C or higher at 140W for an extended period, resulting in a loss of output power. Once the over-temperature protection is activated, you will need to allow the product to cool down before restarting it to restore power output.

• Over power protection (over current protection) test:

• Short circuit protection test:

IV. Product external and internal class clearance drawings

For users to see the design and materials of the product as much as possible, our third-party testing company provides an internal teardown diagram of the power adapter so that users can have a perceptual understanding and trust in the applied materials and its safety.(Original article:https://www.chongdiantou.com/archives/342931.html)

We place great importance on user experience and safety and want to emphasize that the Avalon Nano3 power adapter adheres to the highest global standards. We hope this technical article helps address any concerns and provides clear guidance for product support.

Thank you for your valuable feedback. We will continue to improve to deliver the best products and services.