EP2740179A1 - Ensemble de deux equipements electroniques relies par une liaison filaire formant antenne - Google Patents
Ensemble de deux equipements electroniques relies par une liaison filaire formant antenneInfo
- Publication number
- EP2740179A1 EP2740179A1 EP12743964.4A EP12743964A EP2740179A1 EP 2740179 A1 EP2740179 A1 EP 2740179A1 EP 12743964 A EP12743964 A EP 12743964A EP 2740179 A1 EP2740179 A1 EP 2740179A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- processing unit
- wire
- wire link
- antenna
- coupling means
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2233—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in consumption-meter devices, e.g. electricity, gas or water meters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
- H01Q1/46—Electric supply lines or communication lines
Definitions
- the present invention relates to a set of two electronic equipment connected by a wired connection.
- the invention more particularly relates to an assembly of a first equipment and a second equipment which respectively have electronic circuits connected by a two-wire link.
- the circuit of the first equipment comprises a switch mounted to deliver pulses.
- the second equipment circuit includes a pulse processing unit provided by the switch, a pull resistance mounted between the two-wire link and the processing unit to define a pulse level, and a transmit / receive unit connected to the processing unit and arranged to exchange data with the outside.
- the gas or electricity meter and the associated pulse sensor thus constitutes such an assembly.
- the pulse sensor generally comprises a pulse counting unit connected to a transmitting / receiving unit for communicating with an external receiver for transmitting data from the processing unit to the external receiver, such as an ID number. equipment set (allowing identification of the subscriber) and the number of pulses detected.
- the gas or electricity meter generally comprises a circuit with an open collector transistor activated each time a predetermined volume of gas or electricity is consumed (the word "index" is commonly used to designate this volume). .
- the collector is connected to the positive potential (via a pull resistance defining the high level of the circuit) and to the processing unit by a wire of the two-wire link dedicated to the counting of pulses and the emitter is connected to ground by a ground wire of the two-wire link. This assembly allows the processing unit to detect the activation of the transistor.
- the latter is provided with an antenna tuned to the communication frequency, for example 169 MHz.
- the presence of this antenna causes constraints on the installation of the pulse sensor due to its size.
- Such an antenna is also a significant cost considering the cost of the entire sensor.
- An object of the invention is to provide a means to overcome all or part of these disadvantages.
- a set of a first equipment and a second equipment the first equipment comprises an electrical circuit comprising a switch which has two states for delivering pulses and which is connected via a two-wire link to an electrical circuit of the second equipment which comprises a pulse processing unit, a pull resistance mounted between the two-wire link and the processing unit to define a pulse level and a transmission / reception unit connected to the processing unit and arranged to exchange data of the processing unit with the outside, characterized in that the circuit of the second equipment comprises means for coupling the two-wire link with the transmitting / receiving unit, the coupling means and the two-wire link being arranged so that at least a portion of the two-wire link constitutes a radiating antenna at a frequency definite whatever the state of the switch.
- the two-wire link constitutes an antenna for communicating the transmitting / receiving unit with an external receiver.
- the predetermined frequency is for example equal to 169 MHz. It is therefore no longer necessary to provide a dedicated antenna such as that of previous sets.
- the coupling means may be of the inductive or capacitive type.
- the part of the antenna-forming two-wire link having a length less than k times one quarter of the wavelength corresponding to the predetermined frequency, k being an odd integer
- the coupling means comprise an element inductive, such as a transformer or inductor, between the transmitting / receiving unit and the two-wire link.
- the impedance of the antenna is capacitive and the inductive coupling means can artificially increase the length of the antenna.
- the part of the antenna-forming two-wire link having a length equal to k times a quarter of the wavelength corresponding to the predetermined frequency, k being an odd integer
- the coupling means comprise a capacitance .
- the part of the antenna two-wire link has a length equal to half the wavelength corresponding to the predetermined frequency and comprises a first coaxial wire having an external conductor returned to one half of the length of the wire and connected to ground and an internal conductor connected on the one hand to the processing unit and to the transmitting / receiving unit and, on the other hand, to the terminal corresponding switch, and a second wire connected to the corresponding terminal of the switch and a shock choke mounted in the second equipment and connected to the ground to form the coupling means.
- the shock inductor makes it possible to give the ground wire of the two-wire link a high impedance at the predetermined frequency so as to cancel the possible effects of the switch on the antenna formed by the two-wire link.
- FIG. 1 is a circuit diagram of the assembly according to a first embodiment of the invention
- FIG. 2 is a circuit diagram of the assembly according to a variant of the first embodiment
- FIG. 3 is a circuit diagram of the assembly according to a second embodiment
- FIG. 4 is a circuit diagram of the assembly according to a third embodiment.
- the assembly according to the invention comprises first equipment 1 and second equipment 2 which respectively have electronic circuits 3, 4 connected to each other by a two-wire link 5.
- the first equipment here is a gas or electricity meter whose circuit 3 (represented only in part) is arranged to deliver a pulse to whenever a predetermined volume of gas or electricity has been consumed.
- the circuit 3 comprises for this purpose a switch 6 having two states for delivering pulses.
- the switch 6 is here an open collector transistor for delivering a pulse at each closure.
- the circuit 3 is known in itself, it will not be more detailed here.
- the circuit 4 of the second equipment 2 which comprises a processing unit 7 of the pulses and a radio transmission / reception unit 8 connected to the processing unit 7 and arranged to exchange data of the processing unit with the outside .
- the processing unit 7 is here a microcontroller programmed to detect the pulses (and more precisely the transitions between the two states) and memorize the number of pulses detected.
- the processing unit 7 is connected to an input branch 9 of the circuit 4.
- the input branch 9 is connected at a point 10, on the one hand, to the positive potential Vcc of the circuit 4 through a pulling resistor R1 and, on the other hand, to the ground of the circuit 4 through A capacitor C1.
- the pulling resistor R1 is used to set a default value of the circuit, in this case the high value (so-called "pull-up" resistance). This allows a more reliable counting of the high-level pulses (Vcc).
- the transmission / reception unit 8 is arranged to transmit to an external receiver (not shown) data of the processing unit 7 and in particular an identifier of the set of equipment concerned and the number of pulses stored.
- the two-wire link 5 comprises:
- a wire 5.1 having an end connected to the collector of the transistor forming the switch 6 and an opposite end connected to the input branch 9;
- a wire 5.2 having one end connected to the emitter of the transistor forming the switch 6 and an opposite end connected to the ground of the circuit 4.
- the circuit 4 comprises means for coupling the two-wire link 5 with the transmitting / receiving unit 8.
- the coupling means and the two-wire link 5 are arranged so that the wire 5.1 of the two-wire link 5 constitutes a radiating antenna.
- a predetermined frequency F regardless of the state of the switch 6.
- the predetermined frequency F corresponds for example to the 169 MHz ISM band. At the predetermined frequency F corresponds to the wavelength ⁇ .
- the coupling means may be of the inductive or capacitive type depending on the length of the wire 5.1 of the two-wire antenna link.
- the antenna is tuned in kX / 4 but the wire 5.1 of the two-wire link has a length less than k times a quarter of the wavelength (k being a odd integer).
- the coupling means here are of the inductive type.
- the coupling means comprise a transformer 20 connecting the circuit of the second equipment to the two-wire link 5.
- a first winding of the transformer 20 connects the input branch 9 and the wire 5.1 and the second winding of the transformer 20 connects the transmitting / receiving unit 8 to the wire 5.2.
- the antenna formed by the wire 5.1 of the two-wire link 5 is a capacitive antenna and the inductance of the transformer 20 makes it possible to increase the effective length of the antenna thus formed.
- the transformer 20 furthermore provides an electrical insulation function, for example against electrostatic discharges, between the transmitting / receiving unit 8 and the processing unit 7.
- the wire 5.1 of the two-wire link having a length less than k times the quarter of the wavelength (k being an odd integer)
- the coupling means are always of inductive type but the transformer is replaced by a simple inductor.
- the coupling means then comprise an inductance L1 connected to the transmission / reception unit via a capacitor C2 and at a point of the input branch 9 connecting the wire 5.1 of the two-wire link 5 to the processing unit 7
- An additional resistor R2 is connected in series with the input branch 9 between said point and the processing unit 7.
- the additional resistor R2 has a negligible value with respect to the pulling resistor R1 and has a high impedance at the predetermined frequency F.
- the antenna formed by the wire 5.1 of the two-wire link 5 is a capacitive antenna and the inductance Ll makes it possible to increase the effective length of the antenna.
- This embodiment is particularly simple.
- the wire 5.1 of the two-wire link has a length less than k times a quarter of the wavelength (where k is an odd integer).
- the coupling means are of the capacitive type. This embodiment is identical to the above variant of the first embodiment but the inductance L1 has been removed.
- the coupling means comprise the capacitor C2 connecting the transmitting / receiving unit 8 to a point of the input branch 9, the additional resistor R2 being connected in series with the input branch 9 between said point and the processing unit 7.
- the additional resistor R2 has a negligible value with respect to the pulling resistor R1 and has a high impedance at the predetermined frequency F.
- the resistor R2 may be replaced by a shock choke.
- wire 5.2 having a length equal to k times a quarter of the wavelength with k odd and having one end of said wire connected to the mass.
- the wire 5.2 then constitutes an impedance transformer and has at its opposite end a high impedance.
- the wire 5.2 may be longer than the antenna wire 5.1.
- the two-wire link 5 has a length equal to half the wavelength ⁇ corresponding to the predetermined frequency F.
- the wire 5.1 is here coaxial and has an external conductor 5.11 turned over half of the length of the wire 5.1 and connected to the ground and an inner conductor 5.12 stripped on the other half of the length of the wire 5.1.
- circuit 4 and the coupling means are identical to those of the second embodiment.
- the wire 5.2 has a length equal to half the wavelength and is connected to the ground of the circuit 4 by a shock inductor L1. Wire 5.2 has a high impedance at both ends.
- the shock inductor L1 is arranged to give the ground wire 5.2 a high impedance at the predetermined frequency to prevent the operation of the circuit 3 does not disturb the operation of the antenna constituted by the two-wire link 5.
- the switch may be of a type other than that described to it and be formed by an example by an electromagnetic relay and in particular a relay type "reed".
Landscapes
- Near-Field Transmission Systems (AREA)
- Transceivers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1157085A FR2978874B1 (fr) | 2011-08-02 | 2011-08-02 | Ensemble de deux equipements electroniques relies par une liaison filaire formant antenne |
| PCT/EP2012/065070 WO2013017636A1 (fr) | 2011-08-02 | 2012-08-01 | Ensemble de deux equipements electroniques relies par une liaison filaire formant antenne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2740179A1 true EP2740179A1 (fr) | 2014-06-11 |
| EP2740179B1 EP2740179B1 (fr) | 2019-10-02 |
Family
ID=46639490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12743964.4A Active EP2740179B1 (fr) | 2011-08-02 | 2012-08-01 | Ensemble de deux equipements electroniques relies par une liaison filaire formant antenne |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2740179B1 (fr) |
| FR (1) | FR2978874B1 (fr) |
| WO (1) | WO2013017636A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018105903A1 (de) | 2018-03-14 | 2019-09-19 | Vega Grieshaber Kg | Feldgerät mit einem Metallgehäuse, einer durch eine Kabeldurchführung geführten Anschlussleitung und einem Funkmodul mit einer Antenne |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4730152A (en) * | 1986-11-17 | 1988-03-08 | General Motors Corporation | Vehicle power antenna control with drive stress limiting |
| US4897662A (en) * | 1988-12-09 | 1990-01-30 | Dallas Semiconductor Corporation | Integrated circuit with wireless freshness seal |
| US5757320A (en) * | 1993-04-12 | 1998-05-26 | The Regents Of The University Of California | Short range, ultra-wideband radar with high resolution swept range gate |
| US7099781B1 (en) * | 2005-04-25 | 2006-08-29 | Heidl Jeremy N | Portable hydrant meter and system of use thereof |
-
2011
- 2011-08-02 FR FR1157085A patent/FR2978874B1/fr not_active Expired - Fee Related
-
2012
- 2012-08-01 WO PCT/EP2012/065070 patent/WO2013017636A1/fr not_active Ceased
- 2012-08-01 EP EP12743964.4A patent/EP2740179B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2978874A1 (fr) | 2013-02-08 |
| WO2013017636A1 (fr) | 2013-02-07 |
| FR2978874B1 (fr) | 2014-01-24 |
| EP2740179B1 (fr) | 2019-10-02 |
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