What are the DOE limits for external power supplies?

Notably, the DoE limits now incorporate external power supplies with an output power greater than 250W. Devices that require Federal approval as a medical device are exempt from the DoE legislation. Energy efficiency for external power supplies (EPS). Detailed, concise power supplies blog - read now!

Are power supplies a viable no-load consumption?

Driven by the proliferation of external power supply products and the environmental impact of leaving power supplies always turned on despite the load not being in use, most legislation set limits for what is considered to be a viable no-load consumption.

Is there a code of Conduct for external power supplies?

There is also the EU Code of Conduct for external power supplies that is voluntary. In Canada, there is Natural Resources Canada (NRCan) and in Australia the Minimum Energy Performance Standard (MEPS). Recently both the US DoE and the EU CoC have updated their energy efficiency standards.

How many tiers does a power supply need?

Initially requiring a power supply to meet an efficiency target at a 10% load requirement, the new standard has two tiers intended to assist in defining new developments. The DoE and EU CoC were both introduced in early 2014 with both the DoE and EU CoC tier 2 requirements coming into force in 2016.