source:Industry News Popular:adapter release time:2021-08-20 10:50:00 Article author:sznbone
Low noise supplies
Electrical devices switching on and off create electrical noise having a spectrum consisting of a fundamental at the switching frequency as well as numerous harmonics. Another source of conducted electromagnetic interference (EMI) is ripple in the converter output. Ripple can be a factor because rectification and filtering of a switching supply’s output causes an ac component that rides the dc output. Typical ripple noise levels are on the order of hundreds of microvolts to tens of millivolts. This level is unacceptable in medical equipment, low-noise amplifiers, signal processing, data acquisition, automatic test equipment and laboratory test equipment.
Linear regulated power supplies have little ripple and little output noise, making them suitable for laboratory, medical and instrumentation applications. Equipment that generates and manages X-ray data, requiring reliable, consistent and clean power is an example. In one case, a linear power supply handled a dark room environment for developing X-ray imagery. All LED indicators and digital meters on the supply could be switched off while the power system was in use; toggle switches on the front panel provided individual control of LED indicators and digital meter backlighting.
For the defense industry, components must withstand the extreme environmental conditions that the military faces. In particular, power supply systems must be designed and qualified to strict manufacturing, environmental and operational Military Specifications (MIL-SPEC).
MIL-STD-704 (Aircraft Electrical Power Characteristics) for instance, is a U.S. military standard that defines a standard power interface between a military aircraft and its equipment and carriage stores. The standard covers such topics as voltage, frequency, phase, power factor, ripple, maximum current, electrical noise and abnormal conditions for both ac and dc systems. A point to note is the requirements and specifications for defense applications are unique. Such requirements may prevent standard switching power supplies from meeting military design needs.
Online tools that power supply manufacturers provide can speed the supply selection process. An example is the online Acopian custom system builder. Engineers can use this tool to easily custom-design dc-dc and ac-dc power supplies with just a few clicks, selecting options that range from the number of outputs to the topology of the supply circuit.
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