Question 1

How do I select the right AC/DC power supply for a medical device?

Accepted Answer

Start with the load profile (continuous and peak watts), required output voltages and regulation, then confirm the safety and EMC framework: IEC/EN 60601-1 3rd Edition with 2×MOPP isolation, IEC 60601-1-2 4th Edition immunity, and leakage-current limits for patient-contact equipment. Mechanical envelope, cooling method and expected service life should be evaluated next. Our applications engineers review the full system architecture before recommending a standard or modified platform.

Question 2

What is the difference between a three-phase Delta and three-phase WYE EMI filter?

Accepted Answer

A Delta filter is used on three-wire three-phase systems with no distributed neutral, while a WYE filter is designed for four-wire systems that carry a neutral conductor. The WYE topology filters line-to-neutral noise paths and generally requires higher current-rated neutral components. Selecting the wrong topology can leave common-mode noise unattenuated and cause conducted-emissions failures.

Question 3

Why choose a liquid-cooled power supply instead of an air-cooled unit?

Accepted Answer

Liquid cooling removes heat far more efficiently than forced air, which enables much higher power density in a small footprint, eliminates fan noise and fan-related failure modes, and keeps particulate-sensitive environments such as semiconductor fabs and cleanrooms clean. It is the preferred approach when kilowatt-class power must fit into 1U or a sealed enclosure.

Question 4

Does Astrodyne TDI modify standard power supplies or build fully custom designs?

Accepted Answer

Both. Many programs begin as a modified standard platform — different output voltage, connectors, potting, coating, firmware or mechanical interface — which shortens qualification time. For requirements that cannot be met by a modification, our engineering teams develop ground-up custom power supplies, EMI filters, transformers and integrated power subsystems.

Question 5

What does SEMI F47 compliance mean for semiconductor equipment power supplies?

Accepted Answer

SEMI F47 defines the voltage-sag envelope that single-phase equipment must ride through without interrupting operation. A compliant power supply continues to deliver regulated output during specified short-duration line sags, preventing tool aborts and scrapped wafers. It applies to single-phase input equipment and is a standard requirement for fab capital equipment.