Why needs EMI Filter?

The function of the EMI Filter

The basic function of the AC power filter is to suppress the conducted radiation (namely noise), generated by the power converter from entering the AC power line. Line filters must be designed to suppress conducted emissions to a level low enough to pass regulatory limits. For example, FCC Part 15. Products that do not meet regulatory requirements will not be allowed on the market.

EMI Filter Classification

EMI Filter can be classified as Passive EMI Filter and Active EMI Filter by function. Their similarities and main differences can be summarized as follows.

Similarities

Their basic function is the same. Namely reducing conducted radiation to a level low enough.

Differences

The Active EMI Filter is an active power filter. It has a high impedance to the AC grid in a certain frequency range.

Superiorities

Active EMI Filter in a lot lighter and less bulky, lower cost, lower power consumption, shorter designing time and etc.

Our Products

Power Entry Connector

Power Supply Plug with build-in Active EMI Filter

Active EMI Filter Modules

Active Differential Mode

Active Common Mode

Active Mixed Mode

Applications:

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Power supply for data center
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Server power supply
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Power supply for gaming PC 
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Power adapters 
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Portable chargers for power tools 
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High power density applications
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Any power supply system that requires 
high mobility

Electrical Characteristics:

Symbol	Parameter	Conditions	Min	Typ	Max	Units
High voltage circuit						Hz
fLINE_MAX	Max. AC Line Frequency	\|VAC_PEAK\| ≦ 450V		60		Hz
fLINE_MIN	Min. AC Line Frequency	\|VAC_PEAK\| ≦ 450V		50		V
VAC_PEAK	Peak AC_Line Voltage	50Hz ≦ fLINE ≦ 60Hz			450	W
PIN_MAX	Maximum Input Power	VAC_LINE = 220VAC VAC_LINE = 110VAC			2000 1000	W W
IIN_MAX	Maximum Input Current	VAC_LINE = 220VAC			10 10	ARMS ARMS
RDC_MAX	DC resistance across HV1 and HV2			15	17	mΩ
DC supply
VVCC-MAX	Max. DC supply Voltage	VCC = VV+ – VV-			15	V
VVCC-MIN	Max. DC supply Voltage	VCC = VV+ – VV-	12			V
Iq-VCC	Vcc quiescent Current	VCC = 12V HV1, HV2 and EN pin floating		18	TBD	mA
Pq-VCC	Quiescent power consumption	VCC = 12V HV1, HV2 and EN pin floating		0.22	TBD	W
Low power shut-down
ISD-VCC	Shut-down Current	VCC = 12V VEN = 0V		10	TBD	µA
Pq-VCC	Quiescent power consumption	VCC = 12V VEN = 0V		120	TBD	µW
VEN-TH-SD	EN pin voltage threshold for device enable	VCC = 12V VEN rise from 0V		3	3.5	V
Differential-mode noise suppression
fFILTER-MIN	Minimum frequency of differential mode noise suppression	VCC = 12V EN pin floating		150		kHz
fFILTER-MAX	Maximum frequency of differential mode noise suppression	VCC = 12V EN pin floating		1		MH
GAIN150kHz	Noise Attenuation at 150 kHz	VAC_LINE = 220VAC Line Impedance = 50Ω	TBD	-30		dB
GAIN1MHz	Noise Attenuation at 1 MHz	VAC_LINE = 220VAC Line Impedance = 50Ω	TBD	TBD		dB