SYSTEM FOR COMMUNICATING WITH ELECTRONIC EQUIPMENT, ADAPTER FOR SUCH A SYSTEM, AND CONTAINER FOR SUCH ELECTRONIC EQUIPMENT

Abstract

SYSTEM FOR COMMUNICATING WITH ELECTRONIC EQUIPMENT, ADAPTER FOR SUCH A SYSTEM, AND CONTAINER FOR SUCH ELECTRONIC EQUIPMENT. One aspect of the invention aims to enable communication of electronic equipment (2) enclosed in a container (4) without compromising the transmitted data. It relates in particular to a communication system (3) comprising: an authorized transmitter (31); and a receiver (32), connected to the equipment (2), the transmitter and receiver being configured to communicate contactlessly, the receiver only allowing communication to and from the electronic equipment when a key (61) is detected in the data received (510) by the transmitter. Thus, the electronic equipment can only be queried by an authorized transmitter. An unauthorized transmitter (not knowing the key) has little chance of establishing communication with the electronic equipment. Figure to be published with the abstract: Figure 2

Description

Title of the invention: SYSTEM FOR COMMUNICATING WITH ELECTRONIC EQUIPMENT, ADAPTER FOR SUCH A SYSTEM AND CONTAINER FOR SUCH ELECTRONIC EQUIPMENT. TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention is that of communication with electronic equipment, for example to carry out a diagnosis of this equipment, even when said equipment is conditioned, for example packed in a container. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0002] Establishing communication with electronic equipment, for example during diagnostics, is generally based on connecting said equipment to an external interrogation device, also called a "test device" or "test bench." This test device typically includes a power supply for the electronic equipment and a communication terminal. Therefore, performing the diagnostics requires: • transport the equipment from its storage location to a dedicated workshop; • unpack the equipment from its container or packaging; • Connect the equipment to the power supply and the test terminal.

[0003] These operations monopolize many material, software and human resources, are time-consuming, reduce the availability of electronic equipment and impact their operation.

[0004] The document [“Application Note - Wireless power transfer solution for high performance including data transmission”, Würth Elektronik, https: / / www.we-online.com / en / support / knowledge / application-notes?d=anp070-proprietary-wireless-power-transfer-solution-for-high-performance-including-data-transmission, 22-10-2018] discloses a system 1, illustrated in [Fig. 1], enabling communication with an electronic device 2. In particular, it enables the powering of said device 2 without contact and the acquisition of data from the electronic device 2.

[0005] The disclosed system 1 comprises a primary circuit 11, referred to as the "emitter," and a secondary circuit 12, referred to as the "receiver." The emitter 11 comprises a square wave oscillator with a 50% duty cycle and an LC-type resonant circuit, including a coil 111. The receiver 12 also comprises an LC-type resonant circuit, also including a coil 121. The excitation of the resonant circuit of Transmitter 11 generates a carrier wave via coil 111, specifically a magnetic field oscillating at the fundamental frequency of the input square wave signal. Receiving this carrier wave through coil 121 of receiver 12 generates a high-frequency signal in the receiver, which can then be used to supply electrical power (in this case, after signal rectification). Thus, connecting coils 111 and 121 of the two resonant circuits allows for contactless coupling of transmitter 11 and receiver 12 to power the electronic equipment 2 connected to receiver 12.

[0006] The disclosed receiver 12 also includes a means 122 for modulating the resonant frequency of the resonant circuit. Modulating this resonant frequency modulates a reflection of the carrier by the receiver 12, measurable at the transmitter 11. Modulating the resonant frequency of the receiver 12 thus provides a means of transmitting information from the receiver 12 to the transmitter 11. This reflection modulation can be seen as a second carrier emitted by the receiver 12, the variation in whose amplitude allows information to be conveyed from the receiver 12 to the transmitter 11 (known as "amplitude-shift keying" or "ASK").

[0007] The receiver 12, connected to the electronic equipment 2, can be connected and conditioned with this equipment 2. It thus allows this equipment 2 to be powered without contact and data to be transmitted, without the need to uncondition the equipment 2.

[0008] The type of system illustrated in [Fig. 1] has a limitation in that it offers no security regarding the data transmitted by the conditioned electronic equipment 2. A malicious person can therefore interrogate the equipment and obtain data (concerning, for example, the state of the equipment or its usage history). This person only needs to be able to generate a carrier wave and measure its reflection on the receiver 12.

[0009] Moreover, by using amplitude modulation, the system illustrated in [Fig. 1] remains less robust to coupling variations which significantly impact the signal amplitude during data communication by the electronic equipment 2. This system is also sensitive to electromagnetic amplitude noise.

[0010] There is therefore a need to improve the security of the data communicated by the conditioned electronic equipment 2, as well as the integrity of the signal when data is communicated by the electronic equipment 2. Summary of the invention

[0011] The invention makes it possible to solve at least in part the aforementioned problems.

[0012] To this end, the invention relates to an adapter for ensuring communication without contact between an authorized transmitter and electronic equipment, including: • a first resonant circuit, called the "first upstream resonant circuit", configured to receive a first carrier emitted by the authorized transmitter and convert the first carrier into a first electrical signal; The adapter is remarkable in that it also includes: • a first switch connected to the first upstream resonant circuit and configured to transmit, when closed, the first electrical signal to the electronic equipment; • a first demodulator, configured to demodulate the first electrical signal and obtain a digital data stream; • a first digital comparator including a first memory configured to store a first digital key, the first digital comparator being configured to: • compare the digital data stream from the first demodulator with the first digital key; and • close the first switch when the first digital key is detected in the digital data stream from the first demodulator.

[0013] The adapter can be inserted into the communication channel between the transmitter and the equipment. The implementation of a first upstream resonant circuit makes it possible to establish a contactless (also called "wireless") connection with the transmitter.

[0014] The adapter allows the transmission of the first electrical signal to the equipment only when the first digital key is detected in the data stream from the transmitter.

[0015] In other words, an authorized transmitter, that is, one knowing the first digital key, can insert this first digital key into the data stream modulating the first carrier. Therefore, the detection of this key by the adapter authorizes the transmission of the first signal to the electronic equipment.

[0016] Conversely, an unauthorized sender, that is, one not knowing the first digital key, cannot insert the correct digital key into the first data stream modulating the first carrier. Consequently, the transmission of the first signal to the electronic equipment remains interrupted, protecting the equipment from malicious attack or unauthorized communication.

[0017] Advantageously, the first switch is configured to transmit, when closed, a second electrical signal from the electronic equipment to the authorized transmitter.

[0018] The first switch only allows the passage of the second electrical signal when it is closed, that is, when the first key has been detected in the first An electrical signal (in other words, when an authorized transmitter interacts with the adapter) is required. Therefore, communication from the electronic equipment will only be established with the use of an authorized transmitter. Even powering the electronic equipment by another means (for example, a battery) does not force the transfer of the second electrical signal to the transmitter.

[0019] Advantageously, the adapter includes: • a second switch, configured to transmit, when closed, a second electrical signal from the electronic equipment to the authorized transmitter; • a second demodulator, configured to demodulate the second electrical signal and obtain a digital data stream; • a second digital comparator including a second memory configured to store a second digital key, the second digital comparator being configured to: • compare the digital data stream from the second demodulator with the second digital key; and • close the second switch when the second digital key is detected in the digital data stream from the second demodulator.

[0020] A second switch, dedicated to the transmission of the second electrical signal, thus controls the transmission of the second signal from the electronic equipment to the authorized transmitter. Transmission is only authorized if the electronic equipment is authorized, that is, if it knows the second digital key. Therefore, the adapter blocks data destined for the transmitter if the authorized electronic equipment is exchanged for another unauthorized electronic device (that is, one that does not know the second digital key).

[0021] Advantageously, the first upstream resonant circuit is configured to modulate the first carrier from the second electrical signal.

[0022] Modulating the first carrier establishes a connection to the transmitter. The second signal can then be sent to the transmitter to communicate data from the electronic equipment.

[0023] Alternatively, the adapter includes a second upstream resonant circuit configured to convert the second electrical signal into a second carrier for the authorized transmitter.

[0024] The second carrier allows a connection to be established to the transmitter. The second signal can thus be sent to the transmitter to communicate data from the electronic equipment.

[0025] A misalignment of the resonant circuits, and in particular of the sensitive elements of These circuits (for example, a coil or a piezoelectric element) can interrupt communication, in either direction, between the transmitter and the adapter. Using a single upstream resonant circuit makes it easier to maintain proper alignment between the transmitter and the adapter.

[0026] However, using a single upstream resonant circuit to communicate with the transmitter limits the choice of modulation for the first carrier. Indeed, the modulation used must be different from that used by the transmitter. When the first carrier is modulated by the transmitter using Frequency-Shift Keying (FSK), it must be modulated differently by the adapter, for example, using Amplitude-Shift Keying (ASK). Using a second resonant circuit allows the modulation type of the second carrier to be chosen independently of the modulation type of the first carrier. This can be either ASK or FSK modulation.

[0027] Advantageously, the adapter includes a third resonant circuit, called the "first downstream resonant circuit", configured to emit a third carrier to the electronic equipment, from the first electrical signal and when the first switch is closed.

[0028] The emission of a third carrier by the adapter allows the establishment of a contactless connection between the adapter and the electronic equipment.

[0029] Advantageously, the first downstream resonant circuit is also configured to convert a modulation of the third carrier performed by the electronic equipment into a second electrical signal.

[0030] The conversion of the modulation of the third carrier allows the establishment of a wireless connection to transmit data from the electronic equipment to the transmitter.

[0031] Alternatively, the adapter includes a fourth resonant circuit, called the second downstream resonant circuit, configured to receive a fourth carrier emitted by the electronic equipment and convert the fourth carrier into a second electrical signal.

[0032] The reception of the fourth carrier by the adapter allows the establishment of a wireless connection to transmit data from the electronic equipment to the transmitter.

[0033] Advantageously, the adapter is configured to be connected to the electronic equipment by means of a wired connection.

[0034] In this way, the first and second signals can be sent directly to the electronic equipment. This solution has the advantage of consuming less electrical energy than the transmission / reception of a carrier and the conversion of this last in electrical signal.

[0035] Advantageously, the first upstream resonant circuit includes an AC / DC voltage converter configured to generate a DC voltage from the first signal, the DC voltage powering the first demodulator and the first digital comparator.

[0036] Therefore, the adapter components that detect the first key and open the first switch are only supplied with electrical energy during the reception of the first carrier signal. An interruption in the reception of the first carrier signal for a sufficient duration stops the first demodulator and the first digital comparator from being powered, and causes the first switch to open. Consequently, the first signal ceases to be transmitted to the electronic equipment. The second electrical signal, if present, also ceases to be transmitted to the transmitter.

[0037] Advantageously, the DC voltage also powers the second demodulator and the second digital comparator.

[0038] An interruption in the reception of the first carrier for a sufficient time also stops powering the second demodulator and the second digital comparator. This therefore causes the second switch to open. Consequently, the second electrical signal ceases to be transmitted to the transmitter.

[0039] Advantageously, the first upstream resonant circuit includes a coil, sensitive to an oscillating magnetic field.

[0040] In this way, the adapter can be coupled, without contact, to a transmitter adapted to emit such an oscillating field. The adapter can therefore be placed in a transparent package exposed to an oscillating magnetic field and ensure communication between the transmitter and the electronic equipment.

[0041] Advantageously, the first upstream resonant circuit includes a piezoelectric element, sensitive to an ultrasonic wave.

[0042] In this way, the adapter can be coupled through a solid wall to a transmitter adapted to emit such a wave, even if this solid wall has electromagnetic shielding, for example opaque to an oscillating magnetic field.

[0043] The invention further relates to a system for contactless communication with electronic equipment comprising: • an adapter according to the invention, to ensure contactless communication between an authorized transmitter and the electronic equipment; and • an authorized issuer, including • a modulator configured to modulate, using a digital key, an electrical signal destined for the electronic equipment, said digital key being identical to the first key digital data stored in the adapter's first memory; and • a resonant circuit, configured to convert the electronic signal into a first carrier for the adapter.

[0044] Communication can be established between the authorized transmitter and the electronic equipment via the system adapter. The first carrier wave emitted by the transmitter can then be received by the adapter and converted into a first electrical signal. Since the carrier wave is emitted by an authorized transmitter, the first signal includes the first digital key. The adapter will therefore authorize (by closing the first switch) the sending of the first electrical signal to the electronic equipment. The powered electronic equipment can then communicate data (for example, data related to a self-diagnostic test).

[0045] The invention also relates to a container for electronic equipment comprising: • an adapter according to the invention to ensure contactless communication between an authorized transmitter and the electronic equipment; and • a wall delimiting an interior volume to the wall, said interior volume housing the adapter and being intended to house the electronic equipment, a portion of the container wall, called a "window", adapted to allow the passage of a first carrier emitted by an authorized emitter from outside the wall to the interior volume of the wall.

[0046] The container thus allows the electronic equipment to be stored in order to protect it from shocks, electromagnetic waves and / or the surrounding air while also providing an adapter allowing communication to be established with an authorized transmitter only.

[0047] Advantageously, the wall includes, outside of the window, electromagnetic shielding.

[0048] Electromagnetic shielding makes it possible to ensure, at least in part, the electromagnetic compatibility (known as "EMC") of the electronic equipment with respect to electromagnetic waves that may propagate in the external volume.

[0049] Advantageously, the window comprises a dielectric material and the window has a thickness allowing the passage of an oscillating magnetic field from the outer volume of the container to the inner volume of the container.

[0050] Dielectric materials are transparent to oscillating magnetic fields. They therefore allow inductive coupling between a permitted emitter and the adapter in the container. The window thus allows inductive coupling between the permitted emitter and the adapter in the container. For example, the first resonant circuit of the adapter can be sensitive to an oscillating magnetic field while a second resonant circuit of the adapter is sensitive to a ul- wave trasonore.

[0051] Advantageously, the window includes electromagnetic shielding and the window has a thickness allowing the passage of an ultrasonic wave from the outer volume of the container to the inner volume of the container.

[0052] Thus, the electronic equipment is totally protected from electromagnetic waves. However, a first carrier, in the form of an ultrasonic wave, can still be transmitted to the first resonant circuit of the adapter. BRIEF DESCRIPTION OF THE FIGURES

[0053] The invention and its various applications will be better understood upon reading the following description and examining the accompanying figures. The figures are provided for illustrative purposes only and are not intended to limit the scope of the invention. Unless otherwise specified, the same element appearing in different figures refers to a single element.

[0054] The [Fig.1], described above, presents a system for interrogating electronic equipment according to a prior art.

[0055] Figure 2 presents a first embodiment of a communication system according to the invention as well as an embodiment of a container according to the invention.

[0056] Figure 3 presents a second embodiment of the communication system according to the invention. DETAILED DESCRIPTION

[0057] Figures 2 and 3 schematically illustrate, respectively, the first and second embodiments of a communication system 3 with an electronic device 2. This communication system 3 aims to secure access to the electronic device 2, particularly when it is housed in a container 4 that does not allow easy access to a power plug or a communication interface. The container 4 is, for example, sealed and / or shielded against electromagnetic waves. The system 3 thus ensures contactless communication with the device 2.

[0058] The system 3 according to the invention is also suitable for equipment 2 that must be powered by a carrier wave. A carrier wave is understood to be a wave carrying energy. This could be, for example, an oscillating magnetic field, an electromagnetic field known as "radio frequency" or "RF," or a sound or ultrasonic wave. Equipment 2 includes, for example, a receiver as described in the technological background. The receiver allows, for example, the conversion of a carrier wave into an electrical signal which, once rectified and smoothed, can power components of equipment 2.

[0059] Fig. 2 presents the first embodiment of the communication system 3. It also features a container 4 and electronic equipment 2.

[0060] System 3 comprises: • an authorized transmitter 31, intended to communicate with the equipment 2; and • an adapter 32 intended to ensure communication between the authorized transmitter 31 and an electronic equipment 2.

[0061] The container 4 includes a wall 40 delimiting an internal volume 41 (also referred to as the "interior") from an external volume 42 (also simply referred to as the "exterior"). The internal volume 41 houses the adapter 32 of the communication system 3 and the electrical equipment 2. The authorized transmitter 31 is located outside the container 4.

[0062] The electronic equipment 2 is connected to the adapter 32 either by means of a wired connection or by means of a wireless (also called contactless) connection. The connection between the adapter 32 and the equipment 2 is adapted to transfer a first electrical signal 51, from the transmitter 31, to the equipment 2. It can also be adapted to transfer data from the equipment 2 (for example, a self-diagnostic result) or to the equipment 2 (for example, a command or a parameter for self-diagnostics). It is preferably adapted to allow the transfer of electrical energy from the transmitter 31 to the equipment 2.

[0063] The authorized transmitter 31 and the adapter 32 can be connected to each other by means of a wireless connection. This wireless connection allows, in particular, the transfer of electrical energy and / or data. For this purpose, the wall 40 of the container 4 has at least one portion referred to as a "window" allowing a connection to be established between the transmitter 31 and the adapter 32.

[0064] The transmitter 31 is said to be "authorized" because it is recognized by the adapter 32 as being authorized to establish a transmission of data and / or electrical energy to the equipment 2.

[0065] The transmitter 31 is configured to transmit a first carrier wave to the adapter 32. To this end, the transmitter 31 includes a resonant circuit configured to convert a first electrical signal 51 into the first carrier wave for the adapter 32. In the embodiment of [Fig. 2], the resonant circuit of the transmitter 31 comprises an LC-type resonant circuit. It includes, in particular, an inductor, specifically a coil, in series with a capacitor. The coil thus enables the transmission of an oscillating magnetic field to the adapter 32.

[0066] The transmitter 31 also includes a modulator configured to modulate the first electrical signal 51 using digital data 510, 61. Thus, the transmitter 31 can transmit digital data via the first carrier. The modulator can be configured to modulate the frequency, amplitude, and / or phase of the first electrical signal 51. Preferably, the first electrical signal 51 is frequency modulated.

[0067] In this embodiment, the resonant circuit of the transmitter 31 can be configured to measure and convert a modulation of the first carrier by the adapter 32. The resonant circuit of the transmitter 31 then converts this modulation into a second electrical signal 52. The transmitter 31 includes, for example, a demodulator configured to demodulate digital data 520 from the second electrical signal 52.

[0068] In the embodiment of [Fig. 2], the adapter 32 includes a first resonant circuit 321, referred to as the "first upstream resonant circuit" and more particularly in this embodiment as the "upstream resonant circuit". The upstream resonant circuit 321 is configured to: • receive the first carrier, emitted by transmitter 31; and • convert this into a first electrical signal 51.

[0069] The upstream resonant circuit 321 is called "upstream" because, for the adapter 32, it is positioned upstream of a transmission from the transmitter 31 to the equipment 2. In other words, it is called "upstream" because it interacts with the authorized transmitter 31. The upstream resonant circuit 321 is, in this embodiment, of the LC type. It comprises an inductor, in this case a coil, and two capacitors in series with the coil. Thus, the upstream resonant circuit 321 is sensitive to a carrier wave of the oscillating magnetic field type.

[0070] The resonant circuits of the transmitter 31 and the receiver 32, placed opposite each other, respectively enable the transmission and reception of the first carrier wave. Thus, a contactless connection can be established between the transmitter 31 and the adapter 32 so as to transmit the first signal 51 from the transmitter 31 to the adapter 32. In this embodiment, this transmission is achieved by the transmission and reception of an oscillating magnetic field.

[0071] Alternatively, the connection between the resonant circuits of the transmitter 31 and the receiver 32 can be made by means of an ultrasonic wave. Each of these resonant circuits then comprises a piezoelectric element. Thus, they enable the transmission and reception of an ultrasonic wave.

[0072] The adapter 32 also includes a first functional block 323 for detecting a digital key 61 in the first electrical signal 51 so as to authenticate the transmitter 31 (it is then called an "authorized transmitter" or "authenticated transmitter"). If the latter is authenticated, then the first electrical signal 51 can be transmitted to the electronic equipment 2. Conversely, if the transmitter 31 is not authenticated, the first electrical signal 51 is not transmitted to the electronic equipment 2.

[0073] The first functional detection block 323 of [Fig.2] comprises: • a first signal splitter 3234, which can also be called the "first signal separator" (called "splitter" in English); • a first switch 3232; • a first 3233 demodulator; and • a first digital comparator 3231 including a first memory.

[0074] The first signal splitter 3234 is connected: • to the upstream resonant circuit 321 on the one hand; and • to the first switch 3232 and to the first demodulator 3233 on the other hand.

[0075] It is configured to duplicate the first signal 51 and distribute it between the demodulator 3233 and the first switch 3232. A low-cut filter can be inserted between the first resonant circuit 321 and the first signal splitter 3234 in order to retain only an alternative component of the first signal 51.

[0076] The first switch 3232 allows: • when open, block the transmission of the first signal 51 to equipment 2; and • when it is closed, allow this transmission.

[0077] The switch 3232 is preferably monostable and, in the absence of a command, in its open position. Thus, in the absence of a contrary instruction, the transmission of the first signal 51 to the equipment 2 is blocked.

[0078] The demodulator 3233 is configured to demodulate one of the signals from the first splitter 3234, which corresponds to the first signal 51. This demodulation yields a digital data stream 510, also called a "digital sequence". This is the data stream 510 used by the transmitter 31 to modulate the first signal 51.

[0079] The first digital comparator 3231 performs two tasks. Initially, it is configured to compare the data stream 510 from the first demodulator 3233 with a first digital key 61. Subsequently, it closes the first switch 3232 when the first digital key 61 is detected in the data stream 510 from the first demodulator 3233.

[0080] In this way, when the first digital key 61 is detected in the data 510, it causes the switch 3232 to close and thus the first signal 51 to be transmitted to the electronic equipment 2.

[0081] The first comparator 3231, for example, sends a close command to the first switch 3232. It preferentially maintains this close command for a predefined duration from the detection of the first key 61 in the data 510. Thus, unless the first key 61 is redetected in the data 510, the first switch will open upon expiration of the predefined time. The first comparator 3231 can also maintain the close command as long as it is powered. Thus, when the power supply to the first detection function block 323 is cut off, the first switch 3232 opens, interrupting the transmission of the first signal 51 to equipment 2.

[0082] The first digital memory is configured to store the first digital key 61. The first memory is preferably non-volatile, for example, flash memory. Storing this first key 61 allows verification of the authentication of the transmitter 31. Indeed, it is sufficient for the transmitter 31, when authorized, to insert the first key 61 into the data 510 transmitted to the adapter 32, to allow the transmission of the first signal 51 to the equipment 2. The transmitter 31 therefore preferably also includes a memory to store a copy of the first digital key 61.

[0083] The adapter 32 of [Fig. 2] also includes an AC / DC voltage converter 322 configured to generate a DC voltage from the first signal 51. The converter 322 includes, for example, a diode bridge 3221 and a capacitor. It may also include a voltage regulator 3222 configured to maintain a fixed voltage even under varying load conditions.

[0084] The converter 322 is connected to the first detection functional block 323. It supplies, in particular, the first demodulator 3233 and the first digital comparator 3232. The conversion of the first carrier into the first electrical signal 51, which, once converted into a direct current voltage, powers the first functional block 323 of the adapter 32. Thus, it is the reception of the first carrier by the adapter 32 that powers the first functional block 323 and keeps it in operation.

[0085] Therefore, an interruption in the reception of the first carrier, resulting for example from the misalignment of the resonant circuits of the transmitter 31 and the adapter 32, or even from the removal of the transmitter 31, stops the supply of the first functional block 323 and cuts off the transmission of the first signal.

[0086] Thus, the authorized transmitter 31 cannot be removed and replaced by an unauthorized transmitter.

[0087] A misalignment of the resonant circuits of the transmitter 31 and the adapter 32 can induce a voltage drop which can also imply, when this voltage is lower than the supply voltage of the first detection functional block 323, an opening of the first switch 3232.

[0088] The converter 322 may include a capacitor to smooth out brief interruptions.

[0089] The electronic equipment 2 can be configured to emit a second electrical signal 52 to the transmitter 31. The second signal 52 is, for example, an alternating signal modulated in frequency, amplitude, or phase, to carry information. This information is, for example, the result of a self-diagnosis performed by the equipment 2.

[0090] In the embodiment of [Fig. 2], the first and second signals 51, 52 pass through the first switch 3232. The upstream resonant circuit 321 can be configured to modulate the first carrier, emitted by the transmitter 31, from the second signal 52. This mode of operation of the adapter 32 is called "half-duplex" because the same lines are used to transmit the first signal from the transmitter 31 to the equipment 2 and the second signal 52 from the equipment 2 to the transmitter 31. The data flows sequentially in one direction and then the other, but not simultaneously in both directions.

[0091] Thus, it is the detection of the first digital key 61 in the first signal 51 that allows a bidirectional connection to be established with the equipment 2. Without the detection of the first key 61, the adapter 32 blocks communications in both directions.

[0092] Figure 3 schematically presents a second embodiment of the communication system 3. Only the communication system 3 is shown. Unlike the embodiment of Figure 2, which allows the adapter 32 to operate in "half-duplex" mode, this embodiment allows operation in "duplex" mode. That is to say, different lines are used to transmit, simultaneously, the first signal from the transmitter 31 to the equipment 2 and the second signal 52 from the equipment 2 to the transmitter 31.

[0093] For example, the adapter 32 of [Fig.3] includes a second resonant circuit 326 called the "upstream second resonant circuit", configured to convert the second signal 52 from the electronic equipment 2 into a second carrier, destined for the transmitter 31. This second resonant circuit 326 is also called "upstream" because it interacts with the transmitter 31. The transmitter 31 includes, by mirroring effect, a second resonant circuit enabling it to receive the second carrier and thus obtain the second electrical signal 52.

[0094] The second upstream resonant circuit 326 may be of the same type as the first upstream resonant circuit 321. In the example shown in [Fig. 3], the second upstream resonant circuit 326 is of the LC type. It may also be of a different type, thus avoiding interference between the first and second carriers. The second upstream resonant circuit 326 may, for example, include a piezoelectric element.

[0095] Duplex mode allows the use of electrical signals 51, 52 modulated in the same way without creating interference. They can both be modulated by FSK or ASK. However, in order to reduce the risk of interference between the first and second carriers, the first and second signals 51, 52 can be modulated using different methods. For example, the first signal 51 can be modulated by FSK while the second signal 52 can be modulated by ASK.

[0096] The first and second upstream resonant circuits 321, 326 may also have different resonant frequencies to prevent crosstalk. Thus, the same modulations, for example FSK or ASK, can be used simultaneously.

[0097] It is also possible to implement two half-duplex links in parallel with the first and second upstream circuits 321,326.

[0098] In the embodiment of [Fig. 2], the adapter 32 establishes a wireless connection with the electronic equipment 2. For this purpose, the adapter 32 includes a third resonant circuit 324, referred to as the "first downstream resonant circuit" or, in this embodiment, the "downstream resonant circuit." It is called "downstream" because, for the adapter 32, it is located downstream of a transmission from the transmitter 31 to the equipment 2. It also interacts directly with the equipment 2. The downstream circuit 324 is configured to convert the first signal 51 into a third carrier for the equipment 2. The downstream resonant circuit 324 is also configured to measure and convert a modulation of the third carrier produced by the equipment 2 into a second signal.

[0099] The use of a single downstream resonant circuit 324 to establish communication with the equipment 2 constrains the choice of modulations for the first and second electrical signals 51, 52. In order to avoid interference, the first and second signals 51, 52 are preferably modulated using different methods. For example, the first signal 51 can be modulated by FSK while the second signal 52 can be modulated by ASK.

[0100] In the embodiment of [Fig. 3], the adapter 32 is connected to the electronic equipment 2 by means of two independent connections. A first wired connection allows the first signal 51 to be transmitted to the equipment 2. A second wired connection allows the second signal 52 to be transmitted to the adapter 32 (and then transmitted to the transmitter 31).

[0101] The two independent connections illustrated between the adapter 32 and the equipment 2 are wired. They could also be wireless. For example, the adapter 32 may include a third resonant circuit (as in the example in [Fig. 3]), called the "first downstream resonant circuit," and a fourth resonant circuit, called the "second downstream resonant circuit," respectively configured to convert the first signal 51 into a third carrier and to convert a fourth carrier emitted by the equipment into a second signal 52 into a fourth carrier. However, the wired connection may be preferred because it requires less power consumption compared to a wireless connection.

[0102] The adapter 32 of [Fig. 3] also includes a second functional block 325 for detecting a second digital key 62 in the second electrical signal 52 so as to authenticate the electronic equipment 2. Thus, the adapter 32 can prevent the transmission of equipment 2 that would not be authorized (i.e., that does not know the second digital key 62).

[0103] The second detection functional block 326 operates similarly to the first detection functional block 323. It includes for this purpose: • a second signal distributor 3254; • a second switch 3252; • a second 3253 demodulator; and • a second digital comparator 3251 including a second memory.

[0104] The second signal splitter 3254 is connected: • to electronic equipment 2 on the one hand; and • to the second switch 3252 and to the second demodulator 3253 on the other hand.

[0105] It is configured to duplicate the second signal 52 and distribute the latter between the second demodulator 3253 and the second switch 3252. A low-cut filter can be inserted between the electronic equipment 2 and the second signal splitter 3254 in order to retain only an alternative component of the second signal 52.

[0106] The second switch 3252 allows you to: • when closed, allow transmission of the second signal 52 from the equipment; and • when it is open, cut off this transmission.

[0107] The second switch 3252 is, similarly to the first switch 3232, preferably monostable and, in the absence of a command, in its open position. Thus, in the absence of a contrary instruction, the transmission of the second signal 52 to the transmitter 31 is interrupted.

[0108] The second demodulator 3253 is configured to demodulate the second signal 52 (or at least a replica from the second splitter 3254). This demodulation makes it possible to obtain a digital data stream 520 from equipment 2. This data stream 520 is, for example, the result of a self-diagnosis performed by equipment 2.

[0109] The second digital comparator 3251 is configured to compare the data stream 520 from equipment 2 with a second digital key 62. The second digital comparator 3251 is also configured to close the second switch 3252 when the second digital key 62 is detected in the data stream 520 from equipment 2.

[0110] In this way, the detection of the second digital key 62 in the data stream 520 allows the transmission of the second signal 52 from the electronic equipment 2 to the transmitter 31.

[0111] The second comparator 3251 sends a close command to the second switch 3252 and preferentially maintains this close command for a predefined duration after the second key 62 is detected. The second comparator 3251 can also maintain this close command as long as it is powered. Thus, when the power supply to the second detection function block 325 is cut off, the second switch 3252 opens, interrupting the transmission of the second signal 52 to the transmitter 2.

[0112] The second digital memory is configured to store the second digital key 62. It is preferably non-volatile, for example of the flash type.

[0113] According to one development, the first and second digital keys 61, 62 are identical.

[0114] The AC / DC voltage converter 322 is configured to generate a DC voltage from the first signal 51. In [Fig. 3], the converter 322 is connected to the second detection function block 325. It thus powers the second demodulator 3253 and the second digital comparator 3252. Reception of the first carrier therefore powers the first and second function blocks 323, 325 of the adapter 32. Consequently, an interruption in the reception of the first carrier stops the power supply to the first and second function blocks 323, 325 and cuts off the transmission of the first and second signals 51, 52.

[0115] Figure 2 illustrates a container 4 comprising a wall 40, delimiting the inner volume 41 from the outer volume 42. The wall 40 includes at least one portion, called a "window", adapted to allow a wireless connection between the transmitter 31 and the adapter 32. For example, when the transmitter 31 is located outside 42 of the container 4 and the adapter 32 is located inside 41 of the container 4, the window allows the passage of the first carrier emitted by the transmitter 31 to the inner volume 41 of the container 4.

[0116] The window may include a dielectric material. For example, it may be made of a dielectric material in the form of a single layer (such as a plastic wall) or in the form of a multilayer (such as a superposition of plastic layers). For example, it may be made of a plastic material.

[0117] The wall 40 is preferably continuous at the window. It thus forms a physical barrier to the intrusion of an object and / or a fluid. Therefore, the wall 40 can provide a watertight seal around the interior volume. In other words, the window is not expected to be a simple opening in the wall. That is to say, air, which is a dielectric material, is not considered a portion of the wall, nor even a window.

[0118] A window made of dielectric material allows an oscillating magnetic field to pass through. The first and / or second carriers implemented by the emitter 31 and The 32 adapter can therefore be an oscillating magnetic field.

[0119] The level of coupling between the resonant circuits of the emitter 31 and the adapter 32 depends strongly on the distance between the two coils used by these resonant circuits. It is therefore advisable that the window thickness be as small as possible, for example a few millimeters, in order to guarantee a sufficient level of coupling.

[0120] In order to protect the electronic equipment 2 and / or the adapter 32 from external magnetic fields, the container 4 can be shielded. For example, the wall 40 of the container can include electromagnetic shielding. The wall 40 comprises, for example, a layer of material having high magnetic permeability, such as a soft permalloy.

[0121] The window allowing the transfer of an oscillating magnetic field may, however, be an exception by offering an unshielded portion and a dielectric material in place of the shielding.

[0122] According to an alternative embodiment, the window may comprise a material allowing the propagation of a sound or ultrasonic wave. The first and / or second carriers implemented by the emitter 31 and the adapter 32 may therefore be an ultrasonic wave.

[0123] The window is, for example, made of a solid plastic or a conductive material. A conductive material offering electromagnetic shielding properties can be chosen. This makes it possible to provide a fully shielded container 4.

[0124] The level of coupling between the resonant circuits of the emitter 31 and the adapter 32 also depends strongly on the distance between the two piezoelectric elements by the resonant circuits. It is therefore advisable that the thickness of the window, for example a few millimeters, be as small as possible in order to guarantee a sufficient level of coupling.

[0125] The wall 40 may include a plurality of windows, for example two windows. The plurality of windows allows for several wireless communications between the transmitter 31 and the adapter 32, thus offering the possibility of using duplex operation of the adapter 32.

Claims

Claims

1. Adapter (32) for ensuring contactless communication between an authorized transmitter (31) and electronic equipment (2), comprising: - a first resonant circuit (321), called "first upstream resonant circuit", configured to receive a first carrier emitted by the authorized transmitter (31) and convert the first carrier into a first electrical signal (51); the adapter (32) being characterized in that it also comprises: - a first switch (3232), connected to the first upstream resonant circuit (321) and configured to transmit, when closed, the first electrical signal (51) to the electronic equipment (2); - a first demodulator (3233), configured to demodulate the first electrical signal (51) and obtain a digital data stream (510);- a first digital comparator (3231) comprising a first memory configured to store a first digital key (61), the first digital comparator (3231) being configured to: - compare the digital data stream (510) coming from the first demodulator (3233) with the first digital key (61); and - close the first switch (3232) when the first digital key (61) is detected in the digital data stream (510) coming from the first demodulator (3233).;

2. The adapter (32) of claim 1, wherein the first switch (3232) is configured to transmit, when closed, a second electrical signal (52) from the electronic equipment to the authorized transmitter.

3. Adapter (32) according to claim 1, comprising: - a second switch (3252), configured to transmit, when closed, a second signal (52) coming from the electronic equipment and intended for the transmitter authorized; - a second demodulator (3253), configured to demodulate the second signal (52) and obtain a digital data stream (520); - a second digital comparator (3251) comprising a second memory configured to store a second digital key (62), the second digital comparator (3251) being configured to: - compare the digital data stream (520) coming from the second demodulator (3233), with the second digital key (62); and - close the second switch (3252) when the second digital key (62) is detected in the digital data stream (52) coming from the second demodulator (3253).

4. Adapter (32) according to one of claims 2 or 3, wherein the first upstream resonant circuit (321) is configured to modulate the first carrier (51) from the second signal (52).

5. Adapter (32) according to one of claims 2 or 3, comprising a second upstream resonant circuit (326) configured to convert the second signal (52) into a second carrier intended for the authorized transmitter (31).

6. Adapter (32) according to one of the preceding claims, wherein the first upstream resonant circuit (321) comprises an AC / DC voltage converter (322) configured to generate a DC voltage from the first signal (51), the DC voltage supplying the first demodulator (3233) and the first digital comparator (3232).

7. An adapter (32) according to claim 1, the first upstream resonant circuit (321) comprises a coil, sensitive to an oscillating magnetic field.

8. Adapter (32) according to claim 1, the first upstream resonant circuit (321) comprises a piezoelectric element, sensitive to an ultrasonic wave.

9. System (3) for communicating without contact with electronic equipment (2) comprising: - an adapter (32) according to one of the preceding claims, to ensure contactless communication between an authorized transmitter (31) and electronic equipment (2); and - an authorized transmitter (31), comprising: - a modulator configured to modulate, using a digital key, an electrical signal intended for the electronic equipment (2) with a digital key, said digital key being identical to the first digital key stored in the first memory of the receiver; and - a resonant circuit, configured to convert the electronic signal into a first carrier intended for the adapter (32).

10. Container (4) for electronic equipment (2) comprising: - an adapter (32), according to one of claims 1 to 8, for ensuring contactless communication between an authorized transmitter (31) and the electronic equipment (2); and - a wall (40), delimiting an interior volume (41) to the wall, said interior volume (41) receiving the adapter (32) and being intended to receive the electronic equipment (2), a portion of the wall (40), called a "window", being adapted to allow the passage of a first carrier emitted by an authorized transmitter from the outside of the wall to the interior volume (41) of the wall (41).

11. Container (4) according to claim 10, in which the wall comprises, outside the window, electromagnetic shielding.

12. Container (4) according to one of claims 10 or 11, wherein the window comprises a dielectric material and wherein the window has a thickness allowing the passage of an oscillating magnetic field from the exterior volume (42) of the container (4) to the interior volume (41) of the container (4).

13. Container (4) according to one of claims 10 or 11, and in which the window comprises electromagnetic shielding and in which the window has a thickness allowing the passage of an ultrasonic wave from the external volume (42) of the container (4) to the internal volume (41) of the container (4).

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