GB2224407A - Reducing impedance of mains supply and mains filter - Google Patents

Reducing impedance of mains supply and mains filter Download PDF

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Publication number
GB2224407A
GB2224407A GB8825225A GB8825225A GB2224407A GB 2224407 A GB2224407 A GB 2224407A GB 8825225 A GB8825225 A GB 8825225A GB 8825225 A GB8825225 A GB 8825225A GB 2224407 A GB2224407 A GB 2224407A
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GB
United Kingdom
Prior art keywords
shunt
mains
filter
supply
impedance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8825225A
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GB8825225D0 (en
Inventor
David Michael Rusby
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8825225A priority Critical patent/GB2224407A/en
Publication of GB8825225D0 publication Critical patent/GB8825225D0/en
Publication of GB2224407A publication Critical patent/GB2224407A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)

Abstract

A method of reducing the impedance of the mains supply comprises connecting either a shunt inductor or a shunt inductor in parallel with a shunt capacitor across the supply. A specific application of this invention relates to a mains filter where a shunt inductor 5 in conjunction with a shunt capacitor 4 act to reduce the increase in impedance of the mains supply caused by the series inductors 3. <IMAGE>

Description

A method reducing the impedance of the mains supply by storing electrical energy and a mains filter incorporating apparatus to carry out such a method.
This invention relates to a method of storing electrical energy to reduce the impedance of the mains supply and to a mains filter incorporating apparatus to carry out such a method.
It is a well known fact that the domestic mains supply also contains very high voltage transients and high frequency noise which are harmful to sensitive electronic equipment such as a computer or a Hi-Fi system. Mains filters have appeared on the market to combat these problems. These filters are based on a combination of series inductance and shunt capacitance to attenuate the high frequency noise and often some sort of voltage clamp to limit the transient.
However the series inductance used in these types of filter to provide a barrier to high frequency noise, also increase the impedance of the supply to the equipment at higher frequencies.
Even without a filter the self-inductance of the mains wiring itself increases the impedance of the supply at high frequencies. This impairs the performance of some electrical equipment e.g. computers and seriously degrades the sound of an audio system by slowing the music down.
According to a first aspect of the invention there is provided a method of reducing the impedance of a mains supply wherein shunt inductance is effected across the supply.
According to a second aspect of the invention there is provided a method of reducing the impedance of a mains supply wherein shunt inductance is effected in parallel to shunt capacitance.
According to a third aspect of the invention there is provided a method of storing readily accessible energy to reduce the impedance of the mains supply wherein shunt inductance is effected across the supply.
According to a fourth aspect of the invention there is provided a method of storing readily accessible energy to reduce the impedance of the mains supply wherein shunt inductance is effected in parallel to shunt capacitance.
According to a fifth aspect of the invention there is provided an apparatus for carrying out the method of reducing the impedance of the mains supply comprising a shunt inductor.
According to a sixth aspect of the invention there is provided an apparatus for carrying out the method of reducing the impedance of the mains supply comprising a shunt inductor and a shunt capacitor.
According to a seventh aspect of the invention there is provided an apparatus for carrying out the method of reducing the impedance of the mains supply in relation to a mains filter.
Three embodiments of the invention will now be described by way of example only with reference to the accompanying drawing in which: Figure 1 is a diagram of a conventional mains filter.
Figure 2 is a diagram of the first embodiment of the invention.
Figure 3 is a diagram of the second embodiment of the invention.
Figure 4 is a diagram of the third embodiment of the invention.
In figure 1 a circuit is provided between an input 1 and an output 2 with series inductors 3 and a shunt capacitor 4 to provide attenuation of high frequency noise from the input.
The embodiment of figure 2 shows, in accordance with the invention, a shunt inductor 5 which in conjunction with the shunt capacitor 4 provides the high frequency energy that cannot be obtained from the supply due to the series inductors 3. The value of the inductor used at 5 should be large to store as much energy as possible. The primary winding of a suitable transformer may be used. The embodiment of Figure 3 shows series resistors 6 instead of series inductors to further reduce the high frequency impedance of the supply at the expense of increasing the low frequency impedance. The embodiment of Figure 4 shows the use of a lower voltage shunt capacitor 4 and shunt inductor 5 to perform the same kind of energy store after the mains transformer 7 found in most electrical equipment.

Claims (22)

1. A method of reducing the impedance of a mains supply wherein shunt inductance is effected across the supply.
2. A method of reducing the impedance of a mains supply wherein shunt inductance is effected in parallel to shunt capacitance.
3. A method of storing readily accessible electrical energy to reduce the impedance of the mains supply wherein shunt inductance is effected across the supply.
4 A method of storing readily accessible electrical energy to reduce the impedance of the mains supply wherein shunt inductance is effected in parallel to shunt capacitance.
5. An apparatus for carrying out the method of claim 1, comprising a shunt inductor.
6. An apparatus for carrying out the method of claim 2, comprising a shunt inductor and shunt capacitor.
7. An apparatus for carrying out the method of claim 3 comprising a shunt inductor.
8. An apparatus for carrying out the method of claim 4 comprising a shunt inductor and a shunt capacitor.
9. A mains filter for carrying out the method of claim 1 comprising a shunt inductor.
10. A mains filter for carrying out the method of claim 2 comprising a shunt capacitor and a shunt inductor placed across the capacitor.
11. A mains filter for carrying out the method of claim 3 comprising a shunt inductor.
12. A mains filter for carrying out the method of claim 4 comprising a shunt capacitor and a shunt inductor placed across the capacitor.
13. A mains filter as claimed in claims 10 and 12 wherein the shunt inductor is located after a conventional filter incorporating series inductance and shunt capacitance.
14. A mains filter as claimed in claims 10 and 12 wherein the shunt induction is located after a conventional filter incorporating series inductance and shunt capacitance.
15. A mains filter as claimed in claims 9 and 11 wherein the shunt inductor is located after a mains input transformer.
16. A mains filter as claimed in claims 10 and 12 wherein the shunt inductor and shunt capacitor are located after a mains input transformer.
17. A method of storing readily accessible electrical energy, substantially as hereinbefore described with reference to Figure 2 of the accompanying drawing.
18. A method of storing readily accessible electrical energy, substantially as hereinbefore described with reference to Figure 3 of the accompanying drawing.
19. A method of storing readily accessible electrical energy, substantially as hereinbefore described with reference to Figure 4 of the accompanying drawing.
20. A mains filter substantially as hereinbefore described with reference to Figure 2 of the accompanying drawing.
21. A mains filter sustantially as hereinbefore described with reference to Figure 3 of the accompanying drawing.
22. A mains filter substantially as hereinbefore described with reference to Figure 4 of the accompanying drawing.
GB8825225A 1988-10-28 1988-10-28 Reducing impedance of mains supply and mains filter Withdrawn GB2224407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8825225A GB2224407A (en) 1988-10-28 1988-10-28 Reducing impedance of mains supply and mains filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8825225A GB2224407A (en) 1988-10-28 1988-10-28 Reducing impedance of mains supply and mains filter

Publications (2)

Publication Number Publication Date
GB8825225D0 GB8825225D0 (en) 1988-11-30
GB2224407A true GB2224407A (en) 1990-05-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8825225A Withdrawn GB2224407A (en) 1988-10-28 1988-10-28 Reducing impedance of mains supply and mains filter

Country Status (1)

Country Link
GB (1) GB2224407A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012041367A1 (en) * 2010-09-29 2012-04-05 Siemens Transformers Austria Gmbh & Co Kg Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472411A (en) * 1974-09-19 1977-05-04 Inductotherm Corp Harmonic and power factor compensation for power systems
GB2148643A (en) * 1983-11-07 1985-05-30 Emlux Ltd Filtering electrical signals
EP0222261A2 (en) * 1985-11-11 1987-05-20 Siemens Aktiengesellschaft High-pass filter of a filter arrangement for an AC network connected with a converter
GB2198605A (en) * 1986-11-22 1988-06-15 Emlux Ltd Filtering electrical signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472411A (en) * 1974-09-19 1977-05-04 Inductotherm Corp Harmonic and power factor compensation for power systems
GB2148643A (en) * 1983-11-07 1985-05-30 Emlux Ltd Filtering electrical signals
EP0222261A2 (en) * 1985-11-11 1987-05-20 Siemens Aktiengesellschaft High-pass filter of a filter arrangement for an AC network connected with a converter
GB2198605A (en) * 1986-11-22 1988-06-15 Emlux Ltd Filtering electrical signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012041367A1 (en) * 2010-09-29 2012-04-05 Siemens Transformers Austria Gmbh & Co Kg Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core
CN103270562A (en) * 2010-09-29 2013-08-28 奥地利西门子公司 Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core
US9183980B2 (en) 2010-09-29 2015-11-10 Siemens Aktiengesellschaft Arrangement and method for the compensation of a magnetic unidirectional flux in a transformer core

Also Published As

Publication number Publication date
GB8825225D0 (en) 1988-11-30

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)