F2700AA06【PDF 88/92 页】POWER ENTRY FILTERED 6A FASTON

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Technical Considerations

Meeting Emissions Standards

The emissions limits that a piece of equipment must

meet will depend on the intended market for that piece

of equipment. If there is more than one market, more

than one emission standard may have to be met. This

can have a substantial effect on the circuit, size, and cost

of a filter. Standards like the CISPR’s or the FCC Rules

Part 15 have frequency limits of 150 kHz to 30 MHz.

FCC 15 AND CISPR CONDUCTED EMISSION LIMITS

DIGITAL EQUIPMENT

(Line Impedance Stabilization Network) and using

signal generators to inject RF of varying amplitude and

frequency, some insight can be gained as to the nature

of the problem. However, the criteria for acceptable

performance will have to be decided upon so that a

filter yielding this level of performance can be obtained

from the test procedure. Unfortunately, this still does not

eliminate the need for final testing in the actual operating

environment which, in many cases, occurs in the field.

Selection of a suitable filter can best be based on

the type of power supply or input impedance of the

equipment and on the mode of the offending RFI noise.

80 –

78 –

Quasi-peak

Noise Modes

dBμV

76 –

74 –

72 –

70 –

68 –

66 –

64 –

62 –

60 –

58 –

Average

Quasi-peak

Class A Industrial

Class A Industrial

Class B

Residential

Power line filters attenuate noise in two different modes.

Common Mode: Also known as line-to-ground noise

measured between the power line and ground

potential.

Differential Mode: Also known as line-to-line noise

measured between the lines of power.

Power line filters are designed to attenuate either

one or both modes of noise. The need for one design

over another will depend on the magnitude of each

56 –

noise type present. The attenuation is measured in dB

54 –

52 –

50 –

48 –

46 –

Average

Class B

Residential

(decibels) at various frequencies of signal.

Circuit Con ? guration

Power line RFI filters are generally built with two or

0,15

0,5

Frequency (MHz)

5

30

three-pole filter networks. As the number of poles and

the corresponding component count increases, the

EMI measurements are generally made using

Spectrum Analyzers with Average or Quasi-Peak

detectors in accordance with methods described

in CISPR 16. Quasi-Peak differs from Average

measurements by weight-averaging the peaks into

the total.

Equipment meeting these specifications can

utilize a filter with a fairly high cutoff frequency. Other

standards like FCC 18 with a low frequency limit of 10

kHz will result in the equipment using lower cutoff filters.

As might be expected, the lower the cutoff frequency,

the larger the physical size and the higher the cost of

the filter.

Conducted RFI Susceptibility

The problem of susceptibility can be extremely difficult

to deal with because the amplitude and frequency of

the offending RF noise are seldom known and are often

intermittent. If the malfunction can be duplicated by

isolating the equipment from the power line with LISN’s

cost will increase also. Trying to typify an equipment’s

impedance as either high or low for purposes of filter

selection may not be successful. If it is a complex

impedance, it could probably be low at some

frequencies, high at others, and some intermediate

value at still other frequencies.

Although we have been generally successful in

recommending a two-pole network for linear power

supplies and three-pole networks for switching power

supplies and synchronous motors, you should not limit

your testing to just one circuit type if either additional

circuit performance or lower cost is desired. Consider

the following: If the equipment looked strictly capacitive,

the performance of a two-pole network would be

reduced to that of a single-pole filter.

Figure 1a.

A signal source (E) with

its internal impedance

driving a capacitive load.

86

www.curtisind.com

Curtis Industries

A Division of Powers Holdings, Inc.

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