A Canaan Bitcoin miner experienced a power supply unit (PSU) failure, leading to significant damage. An analysis suggests two primary causes: inadequate power delivery from an extension cord and the use of a non-compliant USB-C cable.
Theory 1: Inadequate Power Delivery from Extension Cord
The PSU was connected via an extension cord, which may not have supported the required 140W (28V @ 5A) power draw. Extension cords can introduce voltage drops and resistance, leading to overheating and potential failure of connected devices. The Electrical Safety Foundation International advises against using extension cords for high-power devices due to these risks.
Theory 2: Use of Non-Compliant USB-C Cable
The PSU utilized a USB-C cable, but delivering 140W at 28V requires USB Power Delivery (PD) 3.1 Extended Power Range (EPR) compliance. Non-compliant cables can fail to negotiate the correct power levels, leading to overcurrent, overheating, or even device damage. Texas Instruments notes that USB PD 3.1 EPR supports up to 240W, but both the power source and cable must be compliant.
Recommended Replacement PSU
For safe and reliable operation, it’s crucial to use a PSU and cable that support the required power specifications. The HKY 140W USB-C Charger is one such option, offering 28V at 5A with PD 3.1 EPR compliance. This charger is UL and FCC/CE certified, ensuring safety and compatibility with devices like the Avalon Nano 3 BTC Miner.
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