WO2002058269A1 - Device for preventing loss of high frequency signals - Google Patents

Device for preventing loss of high frequency signals Download PDF

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Publication number
WO2002058269A1
WO2002058269A1 PCT/AU2002/000052 AU0200052W WO02058269A1 WO 2002058269 A1 WO2002058269 A1 WO 2002058269A1 AU 0200052 W AU0200052 W AU 0200052W WO 02058269 A1 WO02058269 A1 WO 02058269A1
Authority
WO
WIPO (PCT)
Prior art keywords
high frequency
power supply
output
frequency signals
transformer
Prior art date
Application number
PCT/AU2002/000052
Other languages
French (fr)
Inventor
Paul Stephen-Daly
Marek Robert WAMBIER
Lindsay Alfred Champion
Charles Corneles Van Dongen
Original Assignee
Sequred Pty Limited
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 Sequred Pty Limited filed Critical Sequred Pty Limited
Priority to AU2002224658A priority Critical patent/AU2002224658B8/en
Publication of WO2002058269A1 publication Critical patent/WO2002058269A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit

Definitions

  • This invention relates to devices that allow transmission of high frequency signals through remote power supplies associated with electronic appliances or equipment.
  • Some electronic appliances and equipment are powered by remote power supplies.
  • Typical examples are appliances such as facsimile machines, telephone answering machines, and cordless telephones which are powered by AC adaptors that convert the AC mains power into either AC or DC outputs at various voltages, typically from six (6) to fifteen (15) volts.
  • remote power supplies contain a transformer with or without a rectifier, or a switch mode power supply, or other componentry or circuitry which performs an equivalent power conversion function, that usually blocks the transmission of high frequency signals.
  • the invention provides a device to prevent loss of high frequency signals transmitted over a power supply system to an appliance or other electronic equipment powered by a remote power supply incorporating power conversion circuitry which blocks high frequency signals, including first means providing a high frequency signal path to bypass the power conversion circuitry, and second means for coupling the high frequency signal bypassed by the first means to the output of the remote power supply
  • FIGS. 1 to 3 are circuit diagrams illustrating remote power supplies incorporating preferred circuitry embodying the invention. Description of Preferred Embodiments
  • the system embodying the invention includes high frequency electronic circuitry and componentry, such as detailed in Figures 1 to 3, integrated with and typically installed in the same housing or enclosure as, the power conversion circuitry of the remote power supply.
  • This circuitry and componentry is designed to allow high frequency signals picked up from the incoming mains power supply side of a remote power supply to be transmitted to an appliance or equipment connected to the output of the remote power supply, without attenuation or interference.
  • the high frequency signals received at the appliance or equipment are decoded and used to perform the functions which are dependent on these signals.
  • Remote power supplies fitted with this high frequency electronic circuitry and componentry are also compatible with appliances or equipment which do not require high frequency signals picked up from the mains power supply.
  • Figure 1 illustrates the circuitry and componentry of one preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry.
  • the power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals.
  • High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1, capacitors C1 and C3, and high frequency choke L1.
  • the input voltage 3 is applied via connectors CON1 and CON2 and the output is obtained via connectors CON3, CON4 and (optional) CON5.
  • the output 4 of the remote power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4.
  • the output of the remote power supply minus high frequency signals may be obtained via connectors CON4 and CON5.
  • the high frequency signals may be obtained via connectors CON3 and CON5, or via connectors CON3 and CON4.
  • This alternative 3-wire output connection avoids the need for additional componentry and circuitry at the appliance or other electronic equipment to separate the high frequency signals from the output of the remote power supply.
  • the primary winding of transformer T1, and capacitor C1 form a series resonant circuit tuned to the centre frequency of the high frequency signals.
  • the secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1.
  • transformer T1 Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated, while signals at other frequencies (eg noise) are attenuated.
  • the output level of the high frequency signals is set by the turns ratio of transformer T1.
  • Transformer T1 also maintains electrical isolation between the incoming power supply and the low voltage output of the remote power supply.
  • Capacitor C3 is provided to prevent the output current of the remote power supply flowing through the secondary winding of transformer T1 when the optional 3-wire connection is not used, which could cause saturation of the core, and adversely affect transformer action.
  • High frequency choke L1 provides a low impedance path for the output of the remote power supply while presenting a high impedance to the high frequency signals, thus ensuring effective transmission of the high frequency signals to the appliance.
  • Appropriate circuitry and componentry in the appliance are used to separate the high frequency signals from the output of the remote power supply.
  • Figure 2 illustrates the circuitry and componentry of a second preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry.
  • the power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals.
  • High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1 and capacitor C1.
  • the input voltage 3 is applied via connectors CON1 and CON2 and the output 4 is obtained via connectors CON3, CON4 and (optional) CON5..
  • the output of the remote power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4.
  • the output of the remote power supply minus high frequency signals may be obtained via connectors CON4 and CON5 utilising the optional 3-wire connection shown.
  • the high frequency signals may be obtained via connectors CON3 and CON5, or via connectors CON3 and CON4.
  • This alternative 3-wire connection avoids the need for additional componentry and circuitry at the appliance or other electronic equipment to separate the high frequency signals from the output of the remote power supply.
  • the primary winding of transformer T1, and capacitor C1 form a series resonant circuit, tuned to the centre frequency of the high frequency signals.
  • the secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1. Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated.-while signals at other frequencies (eg noise) are attenuated.
  • the output level of the high frequency signals is set by the turns ratio of transformer T1.
  • Transformer T1 also maintains electrical isolation between the incoming power supply and the low voltage output of the remote power supply.
  • Transformer T1 is so designed that when the optional 3-wire connection is not used, its secondary winding can cany the full rated output current of the remote power supply without causing core saturation, which would adversely affect transformer action.
  • Appropriate circuitry and componentry in the appliance are used to separate the high frequency signals from the output of the remote power supply when the optional 3-wire connection is not used.
  • FIG 3 illustrates the circuitry and componentry of a third preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry.
  • the power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals.
  • High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1 and capacitors C1 and C3.
  • the input voltage 3 is applied via connectors CON1 and CON2 and the output 4 is obtained via connectors CON3 and CON4.
  • the output of the remote power supply, with superimposed high frequency signals is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4.
  • the primary winding of transformer T1, and capacitor C1 form a series resonant circuit, tuned to the centre frequency of the high frequency signals.
  • the secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1. Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated, while signals at other frequencies (eg noise) are attenuated.

Abstract

The invention provides a device to prevent loss of high frequency signals transmitted over a power supply system to an appliance or other electronic equipment powered by a power supply incorporating power conversion circuitry (1) which blocks high frequency signals, including first means providing a high frequency signal path (2) to by pass the power conversion circuitry, and second means for coupling the high frequency signal bypassed by the first means to the output (4) of the power supply. The input voltage (3) is applied via connectors CON1 and CON2 and the ouput (4) is obtained via connectors CON3, CON4 and optional CON5. The output (4) of the power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4.

Description

DEVICE FOR PREVENTING LOSS OF HIGH FREQUENCY SIGNALS
Field of the Invention
This invention relates to devices that allow transmission of high frequency signals through remote power supplies associated with electronic appliances or equipment.
Background of the Invention
Some electronic appliances and equipment are powered by remote power supplies. Typical examples are appliances such as facsimile machines, telephone answering machines, and cordless telephones which are powered by AC adaptors that convert the AC mains power into either AC or DC outputs at various voltages, typically from six (6) to fifteen (15) volts.
In general, remote power supplies contain a transformer with or without a rectifier, or a switch mode power supply, or other componentry or circuitry which performs an equivalent power conversion function, that usually blocks the transmission of high frequency signals.
The functions of some electronic appliances or equipment are dependent upon high frequency signals received through the incoming mains power supply. Consequently, when a remote power supply or other device, eg. a line filter or uninterruptable power supply, is interposed between the mains power supply and the appliance or equipment, the high frequency signals are severely attenuated by the power conversion circuitry in the remote power supply or other device. This renders inoperative those functions in the appliance or equipment which are dependent on the high frequency signals.
Summary of the Invention
The invention provides a device to prevent loss of high frequency signals transmitted over a power supply system to an appliance or other electronic equipment powered by a remote power supply incorporating power conversion circuitry which blocks high frequency signals, including first means providing a high frequency signal path to bypass the power conversion circuitry, and second means for coupling the high frequency signal bypassed by the first means to the output of the remote power supply
Brief Description of Drawings
Figures 1 to 3 are circuit diagrams illustrating remote power supplies incorporating preferred circuitry embodying the invention. Description of Preferred Embodiments
The system embodying the invention includes high frequency electronic circuitry and componentry, such as detailed in Figures 1 to 3, integrated with and typically installed in the same housing or enclosure as, the power conversion circuitry of the remote power supply. This circuitry and componentry is designed to allow high frequency signals picked up from the incoming mains power supply side of a remote power supply to be transmitted to an appliance or equipment connected to the output of the remote power supply, without attenuation or interference. The high frequency signals received at the appliance or equipment are decoded and used to perform the functions which are dependent on these signals. Remote power supplies fitted with this high frequency electronic circuitry and componentry are also compatible with appliances or equipment which do not require high frequency signals picked up from the mains power supply.
Figure 1 illustrates the circuitry and componentry of one preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry. The power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals. High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1, capacitors C1 and C3, and high frequency choke L1. The input voltage 3 is applied via connectors CON1 and CON2 and the output is obtained via connectors CON3, CON4 and (optional) CON5. The output 4 of the remote power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4. Alternatively, the output of the remote power supply minus high frequency signals may be obtained via connectors CON4 and CON5. In the latter case, the high frequency signals may be obtained via connectors CON3 and CON5, or via connectors CON3 and CON4. This alternative 3-wire output connection avoids the need for additional componentry and circuitry at the appliance or other electronic equipment to separate the high frequency signals from the output of the remote power supply. The primary winding of transformer T1, and capacitor C1 form a series resonant circuit tuned to the centre frequency of the high frequency signals. The secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1. Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated, while signals at other frequencies (eg noise) are attenuated. The output level of the high frequency signals is set by the turns ratio of transformer T1. Transformer T1 also maintains electrical isolation between the incoming power supply and the low voltage output of the remote power supply. Capacitor C3 is provided to prevent the output current of the remote power supply flowing through the secondary winding of transformer T1 when the optional 3-wire connection is not used, which could cause saturation of the core, and adversely affect transformer action. High frequency choke L1 provides a low impedance path for the output of the remote power supply while presenting a high impedance to the high frequency signals, thus ensuring effective transmission of the high frequency signals to the appliance. Appropriate circuitry and componentry in the appliance are used to separate the high frequency signals from the output of the remote power supply. Figure 2 illustrates the circuitry and componentry of a second preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry. The power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals. High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1 and capacitor C1. The input voltage 3 is applied via connectors CON1 and CON2 and the output 4 is obtained via connectors CON3, CON4 and (optional) CON5.. The output of the remote power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4. Alternatively, the output of the remote power supply minus high frequency signals may be obtained via connectors CON4 and CON5 utilising the optional 3-wire connection shown. In the latter case, the high frequency signals may be obtained via connectors CON3 and CON5, or via connectors CON3 and CON4. This alternative 3-wire connection avoids the need for additional componentry and circuitry at the appliance or other electronic equipment to separate the high frequency signals from the output of the remote power supply. The primary winding of transformer T1, and capacitor C1 form a series resonant circuit, tuned to the centre frequency of the high frequency signals. The secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1. Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated.-while signals at other frequencies (eg noise) are attenuated. The output level of the high frequency signals is set by the turns ratio of transformer T1. Transformer T1 also maintains electrical isolation between the incoming power supply and the low voltage output of the remote power supply. Transformer T1 is so designed that when the optional 3-wire connection is not used, its secondary winding can cany the full rated output current of the remote power supply without causing core saturation, which would adversely affect transformer action. Appropriate circuitry and componentry in the appliance are used to separate the high frequency signals from the output of the remote power supply when the optional 3-wire connection is not used.
Figure 3 illustrates the circuitry and componentry of a third preferred embodiment of a remote power supply fitted with high frequency detection and coupling circuitry. The power conversion circuitry 1 may consist of a transformer with or without an output rectifier, or a switch mode power supply, or other circuitry to perform an equivalent function and which would block the passage of high frequency signals. High frequency signals on the incoming supply are detected and coupled to the output by means of high frequency circuitry 2, comprising transformer T1 and capacitors C1 and C3. The input voltage 3 is applied via connectors CON1 and CON2 and the output 4 is obtained via connectors CON3 and CON4. The output of the remote power supply, with superimposed high frequency signals, is connected to the appliance or other electronic equipment via output socket connectors CON3 and CON4. The primary winding of transformer T1, and capacitor C1 form a series resonant circuit, tuned to the centre frequency of the high frequency signals. The secondary winding of transformer T1 is used as a sensing winding, which replicates the high frequency signals flowing in the primary winding of transformer T1. Because of the resonant circuit formed by T1 primary and capacitor C1, signals at the resonant frequency (ie the desired signals) are accentuated, while signals at other frequencies (eg noise) are attenuated.

Claims

The output level of the high frequency signals is set by the turns ratio of transformer T1. Transformer T1 also maintains electrical isolation between the incoming power supply and the output of the remote power supply. Capacitor C3 prevents current from the output of the power conversion circuitry flowing through the secondary winding of transformer T1 and possibly causing saturation of the core, which would adversely affect transformer action. Appropriate circuitry and componentry in the appliance are used to separate the high frequency signals from the output of the remote power supply.Claims
1. A device to prevent loss of high frequency signals transmitted over a power supply system to an appliance or other electronic equipment powered by a remote power supply incorporating power conversion circuitry which blocks high frequency signals, including first means providing a high frequency signal path to bypass the power conversion circuitry, and second means for coupling the high frequency signal bypassed by the first means to the output of the remote power supply
2. The device of Claim 1, wherein the first means includes a high frequency transformer, and at least one capacitor configured as a resonant circuit to detect and couple the high frequency signal to the output of the remote power supply.
3. The= device of Claim 2, wherein the high frequency transformer is such that core saturation cannot occur at current outputs up to the maximum rated output current of the remote power supply.
4. The device of Claim 2, further including a further capacitor connected to prevent the output current of the remote power supply flowing through the secondary of the high frequency transformer, and a choke connected to provide a low impedance path for the output current of the adaptor, while presenting high impedance to the high frequency signals.
5. The device of Claim 2, configured as a three-wire output device such that the output of the power conversion circuitry and the high frequency signals are electrically independent at the device, and no additional circuitry or componentry are required at the appliance or equipment to separate the high frequency signals from the output of the power conversion circuitry.
PCT/AU2002/000052 2001-01-22 2002-01-18 Device for preventing loss of high frequency signals WO2002058269A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002224658A AU2002224658B8 (en) 2001-01-22 2002-01-18 Device for preventing loss of high frequency signals

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPR2639 2001-01-22
AUPR2639A AUPR263901A0 (en) 2001-01-22 2001-01-22 Invention of and circuitry to allow the transmission of high frequency signals through a remote plug pack

Publications (1)

Publication Number Publication Date
WO2002058269A1 true WO2002058269A1 (en) 2002-07-25

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WO (1) WO2002058269A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5187865A (en) * 1990-06-19 1993-02-23 Intel Corporation Method of coupling lf signals by means of power line communications coupler

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5187865A (en) * 1990-06-19 1993-02-23 Intel Corporation Method of coupling lf signals by means of power line communications coupler

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AUPR263901A0 (en) 2001-02-15

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