AC Surge Filter Hybrid Filter Technology

 

Hybrid Filter Technology

While equipment damage due to lightning strikes and power surges between line and neutral (Normal Mode) are more dramatic, they are less frequent and overall less of a problem than ground line (Common Mode) and general high frequency interference. Juice Goose recognizes and addresses all modes of AC power disturbances with its Hybrid Filter Technology. By integrating noise filtration and surge suppression technology into a single protection circuit, Juice Goose RX Series products clean AC line noise and provide power protection on the hot, neutral and ground power leads.

RX Series products clean up both normal mode and common mode noise without contaminating the ground - reducing common mode (neutral to ground) interference to less than 1 volt, while limiting normal mode surges to under 10 volts. Plus, RX Series products feature patented circuitry which protects from over voltages and in-wall wiring faults.

Common Problems

Digital, binary logic, whether within computers or other processor driven components, is based on discreet small differences in voltage. The injection of common mode interference into this dynamic can cause digital confusion by adding to or subtracting from processor voltages that should be indicating certain logic states needed for computation. By limiting common mode interference to less than one volt, the Juice Goose Hybrid Filter circuit improves digital processor dependability.

Line Noise

Standard AC current in the US is supposed to fluctuate at 60 cycles per second. Often, equipment operating on a power grid can inject additional frequencies into the power line. These higher frequencies can sometimes be heard or seen on audio or video components. The effects of this line noise can be experienced as audio "hiss" or video "snow". Juice Goose RX Series products reduce a wide range of interfering frequencies by 60dB to 80dB. Compare this performance to an isolation transformer many times the size and cost of a Juice Goose RX Series product.

How it works

The Hybrid Filter design uses a series mode differential transformer and fast acting voltage clamping components. Together they act as a low pass, line conditioning filter. These components plus a quite large capacitor between neutral and ground comprise the foundation of the circuit which blocks normal mode and common mode AC surges and line noise without adversely affecting the ground line.

 

Block Diagram of the Hybrid Filter design

Compare RX Series Performance
(Based on published data.)
Click here for a pdf file of this table

JUICE GOOSE
RX SERIES

FURMAN
PRO SERIES

 

SURGEX

TRANSIENT ENERGY ABSORPTION (JOULES)

1020

550

"UNLIMITED"
MAX APPLIED SURGE CURRENT (A)

3000

N/L

3000

MAX APPLIED SURGE PULSE (V)

6000

N/L

6000

LET THROUGH SLEW RATE (V)

L-N

10

N/L

28

N-G

0.5

N/L

UNCHANGED

MAXIMUM CLAMPING VOLTS

N/A

400

N/A

RESPONSE TIME (THEORETICAL nS)

N/A

1

N/A

COMMON MODE (N - G)
Noise Reduction in dB

100kHz

30

N/L

0

300kHz

77

N/L

0

1 MHz

80

>60

0

10MHz

80

>60

0

30MHz

80

>60

0

NORMAL MODE (L-N)
Noise Reduction in dB

100kHz

21

N/L

38

300kHz

56

N/L

50

1 MHz

60

>40

50

10MHz

60

>40

50

30MHz

60

>40

50

Notes to Table: N/L = information not listed in company's published specifications. N/A = specification not relevant to the particular product design (e.g. inductors and filters in the RX Series do not "clamp" as do MOVs and "crowbar" type devices - and so, have no technical response time). All information was obtained from published data sheets or web sites and was believed to be accurate at the time of this publication.

A 2004 LAB TEST

In an electronics testing and design laboratory, the RX Series circuit and a Surgex SX 908 were subjected to the same high voltage surge events using sophisticated surge generation and recording equipment. The Juice Goose RX Series circuit outperformed Surgex in reducing the voltage let through on both normal and common mode.

In the Normal Mode test both devices were subjected to a 6,000 volt surge. The RX Series circuit allowed 3.7 volts to pass. The Surgex device allowed passage of 196.0 volts. In the Common Mode test, surge input voltage was reduced somewhat. The Juice Goose circuit was subjected to a 3,000 volt surge. It allowed 0.287 volts (i.e. 287 millivolts) to pass through. The Surgex device was subjected to one third that amount of surge, 1,000 volts. It allowed a substantial 855.0 volts through.

The charts below are actual electronic photo images take from the oscilloscopes at the time the tests were performed. Click here to download a pdf of the Normal Mode test or the Common Mode test.

RX Series
Normal Mode Let Through
Subjected to 6000V @ 200A
Ring Wave

normalmodegraph1.jpg (54673 bytes)

Note the maximum surge voltage let through is -3.70 volts.

SurgeX SX908
Normal Mode Let Through
Subjected to 6000V @ 200A
Ring Wave

normalmodegraph2.jpg (55169 bytes)

Note the maximum surge voltage let through is -196.0 volts.

RX Series
Common Mode Let Through
Subjected to 3000V @ 200A
Ring Wave
commonmodegraph 1.jpg (53961 bytes)

Note the maximum surge voltage let through is 0.287 volts (287.5 millivolts).

SurgeX SX908
Common Mode Let Through
Subjected to 1000V @ 200A
Ring Wave

commonmodegraph 2.jpg (54997 bytes)

Note the maximum surge voltage let through is 855.0 volts.

RX15-DPC Component Detail

The RX Series products include
5 Levels of Power Protection

1 High Voltage Surge and Lightning Protection Stops dangerous surges from damaging equipment
2 Common Mode Low Voltage Filtration Decreases equipment malfunction and emitted noise
3 High Frequency Noise Reduction Acts like an isolation transformer to reduce RFI and EMI noise
4 Over Voltage Protection Protects against prolonged exposure to high voltage
5 Wiring Fault Protection Protects against absent ground and reverse polarity
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