title: COSEL Power Supply, Noise Filter 2025 Product Catalog

Summary

COSEL Power Supply, Noise Filter 2025 Product Catalog

1Noise Basics4Propagation Paths of Noisea. Conductive noiseRefers to noise that propagates through a power line orPCB tracing.b. Inductive noiseRefers to noise that is induced due to electromagneticor electrostatic induction caused by a power line or asignal line of a peripheral device when it is placednear a line or pattern in which noise current flows andpropagates through the line.c. Radiated noiseNoise radiated by an antenna (or a line be having asan antenna) that propagates to other devices throughthe air.6Types of Conductive NoiseNoise is divided into two types based on its generationmode: normal mode noise and common modenoise. Normal mode noise is also called differentialmode noise, and refers to noise generated betweenpower lines. Common mode noise refers to noisegenerated between a power line and ground line.Input[Normal Mode]Power sourcemachineNoisesource[Common Mode]InputPower sourcemachineNoise sourcePowersupplyOther apparatusRadiated noiseFigure 1.6.1 Noise Generation Paths(Example in which a noise source is within power equipment)5Power electronics devices(inverters and switchingpower source)Other apparatusConductive noiseOther apparatusFigure 1.4.1 Propagation Paths of NoiseBasics of Noise ReductionLoadInductive noiseThe propagation of noise consists of a noise source,an entity that is affected by the noise, and propagationpath that connects both. To reduce noise:Reduce the noise level of a noise sourceMake it more difficult for noise to propagateMake equipment less vulnerable to noiseIn addition to the abore, designs must considerstandards, quality and cost of noise reduction methods.7Types of and Countermeasures for NoiseKinds of Noisea. High-frequency noiseb. Pulse noisec. Surge noisea. High-frequency noiseAlso called EMI noise or power supply noise andrefers to high-frequency components such as theclock frequency of a computer and switchingfrequency of power sources. As an antinoisemeasure, an EMI filter should be installed on theinput side. An appropriate filter should be selectedbased on requirements such as attenuation, mechanicaldesign and cost.EMI FilterLINE LOADMotordriverMotorNoise SourcesPropagationPathsEquipment affectedby a noise failure1009080EN55011 Group2 ClassAQPFigure 1.5.1 Overview of Noise Generationand Propagation PathLevel [dBμV]7060504030No EMI FilterWith EMI FilterAV20100 0.1 1 10 100Frequency [MHz]Figure 1.7.1 Example of Noise Reductionby an EMI FilterEMI/EMCFilter? 761 ?Technical Notes-3