LABEL LOCALIZATION SYSTEM

Description

FIELD OF INVENTION

[0001] The present invention relates to a label localization system TECHNOLOGICAL BACKGROUND

[0002] WO 2015 / 136,146 describes an electronic price tag including a photovoltaic module.

[0003] In industry and logistics, storing objects in a location for a period of time is a common practice. For example, in logistics, an object enters a warehouse, is stored there for a certain period, and then leaves. If necessary, the object can be moved from one location to another within the warehouse.

[0004] There is currently a need for greater traceability of objects in these contexts. Indeed, it sometimes happens that, for various operational reasons, an object is not located where it would be expected to be.

[0005] Several solutions have been proposed for geolocating objects in this context. One option is to use a geolocated tag (using the technology known as GPS, for Ground Positioning System) attached to the object to be located. By monitoring the tag's location, information about the object's position can be obtained. One drawback of this solution is its high energy consumption. The tags are powered by an integrated battery whose charge level cannot be monitored. If the tag's battery is depleted, the associated object can no longer be located. This results in reliability issues with the overall solution. To resolve this problem, all tags must be regularly inspected for individual battery replacements, or battery replacement campaigns must be implemented, which is complex to manage.

[0006] The invention thus aims to provide a robust solution to this monitoring need. SUMMARY OF THE INVENTION

[0007] Thus, the invention relates to a system for locating labels in an environment, comprising: at least one anchor, suitable for fixing in the environment, and comprising at least one anchor communication module, at least one flexible label, the flexible label comprising: a flexible printed circuit board comprising at least one label communication module suitable for communicating with the anchor communication module, and a printed circuit board electrical connection element, a flexible photovoltaic module assembled to the flexible printed circuit board, the flexible photovoltaic module comprising a photovoltaic layer and at least one electrical connection element suitable for electrical connection to the printed circuit board electrical connection element, the printed circuit board further comprising a supercapacitor interposed between the printed circuit board electrical connection element and the label communication module, the flexible printed circuit board comprising an analog comparator circuit between the supercapacitor and the label communication module,and exhibiting hysteresis, triggering the power supply to the tag communication module for a first input voltage, and suspending the power supply to the tag communication module for a second input voltage lower than the first input voltage.

[0008] These features allow the object being monitored to be tracked without risk of battery depletion. This results in increased system reliability and, consequently, greater public acceptance.

[0009] Although the invention has been presented above in the context of a warehouse, it is applicable to other fields. For example, in the industrial sector, it is known that an object being manufactured or packaged is moved from one workstation to another within a factory, undergoing various treatments at each workstation. Thus, the invention is also applicable to this scenario.

[0010] Depending on various aspects, it is possible to predict one and / or the other of the characteristics below taken alone or in combination.

[0011] According to one embodiment, the flexible printed circuit board includes at least one capacitor in parallel with the supercapacitor.

[0012] According to one embodiment, the flexible printed circuit board includes an electronic protection circuit between the photovoltaic module and the supercapacitor.

[0013] According to one embodiment, the label further comprises a flexible housing assembled to the flexible printed circuit board and the flexible photovoltaic module, the flexible printed circuit board being interposed between the housing and the flexible photovoltaic module.

[0014] According to one embodiment, the flexible printed circuit board includes a processor adapted to implement processing dependent on a power supply parameter of the flexible printed circuit board by the photovoltaic module.

[0015] According to one embodiment, the localization system further includes a processor adapted to determine a position of the label from a communication received at the anchor communication module.

[0016] According to one embodiment, the processor includes a computerized control module adapted to issue a notification after comparing received communications with a checklist or a route programmed for a label.

[0017] In another aspect, the invention relates to a flexible label, comprising: a flexible printed circuit board comprising at least one label communication module adapted to communicate with an anchor communication module, and a printed circuit board electrical connection element, a flexible photovoltaic module assembled to the flexible printed circuit board, the flexible photovoltaic module comprising a photovoltaic layer and at least one electrical connection element adapted for electrical connection to the printed circuit board electrical connection element, the printed circuit board further comprising a supercapacitor interposed between the electrical connection element of the printed circuit board and the tag communication module, the flexible printed circuit board comprising an analog comparator circuit between the supercapacitor and the tag communication module, and exhibiting hysteresis triggering the power supply to the tag communication module for a first input voltage, and suspending the power supply to the tag communication module for a second input voltage lower than the first input voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Embodiments of the invention will be described below with reference to the drawings, briefly described below: [ Fig. 1 ] represents a schematic view of an environment in which the invention is implemented according to an example embodiment. Fig. 2] is a perspective view that represents a label according to a particular embodiment. Fig. 3 ] is an exploded view of the embodiment of the figure 2 . [ Fig. 4 ] is a schematic cross-sectional view of the label of the figure 2 . [ Fig. 5 [ ] is an illustrative diagram of an electronic circuit according to one embodiment. Fig. 6 ] is a fictitious time diagram representing the voltage Vin over time in different operating phases.

[0019] In the drawings, identical references designate identical or similar objects. DETAILED DESCRIPTION

[0020] There figure 1This schematically represents an environment 1 in which the invention, according to one embodiment, is implemented. Environment 1 is, for example, a covered space. In particular, it may be a space enclosed by a structure 31. The structure 31 thus defines an interior and an exterior. Such an enclosed space may include openings, which may be temporarily closable, for transfer into or out of environment 1. In the context of the invention, environment 1 typically has a surface area of ​​at least 10 square meters (m²). Environment 1 is, for example, typically a factory, a warehouse, a workshop, a railway or bus station, an airport, or a venue for events, such as a museum, a stadium, or the like.

[0021] Environment 1 may have an enclosure 31 that is at least partially translucent, allowing sunlight to enter the enclosure. For example, the enclosure 31 may include translucent surfaces 32, made of glass or plastic, such as glazed doors, windows, skylights, etc. Where applicable, only a portion of the interior is exposed to sunlight, and a portion of the interior receives no sunlight, either temporarily or permanently.

[0022] Within the framework of the invention, a place is considered to receive no sunlight when, at that place, the light intensity is less than a predetermined threshold.

[0023] The local natural illumination inside the location is likely to vary over time, due on the one hand to the cycle of illumination by the sun (daily cycle, but also dependent on the seasons) and on the other hand to the obstruction of access routes to sunlight, by the partial or total closure of doors, shutters, curtains or other devices that block out the environment 1.

[0024] Environment 1 may include artificial lighting 4. Artificial lighting 4 may include one or more objects capable of emitting light, particularly when they receive energy, especially electrical energy. Artificial lighting 4 may include, for example, one or more light bulbs, fluorescent tubes, LEDs, or other similar devices. Furthermore, artificial lighting 4 may be controlled by an interrupt system 33, thus allowing all or part of the artificial lighting 4 to be switched on or off.

[0025] The invention is applicable to an environment 1 comprising natural lighting and / or artificial lighting.

[0026] Within environment 1, there is one or more objects 2. Object 2 is mobile relative to environment 1. Object 2 is not necessarily fixed to environment 1 and can enter and / or leave it. For example, consider the following cases: object 2 is created in environment 1 and then leaves; object 2 enters environment 1 and is deconstructed or destroyed there; object 2 enters environment 1, remains there for a certain time, and then leaves; object 2 is created in environment 1 (or is already present there) and is used without leaving it.

[0027] As a purely illustrative example, environment 1 is a factory comprising several workstations 3. We will designate two distinct workstations, spaced apart, as "3a" and "3b". Object 2 may be located successively at one workstation and then at another, 3a, 3b. At these workstations, object 2 may be stored and / or processed. Object 2 is mobile from one workstation 3a to another, 3b, by any appropriate means, for example, by being moved manually and / or via a mechanized conveyor or other means.

[0028] For example, in one embodiment, a process for processing object 2 is provided that requires it to spend a first instant of duration d1 at the first workstation 3a, and then be transported to the second workstation 3b where it spends a second instant of duration d2. The transfer between the first workstation 3a and the second workstation 3b can typically be of duration d3. The steps undergone by object 2 before the first workstation 3a and after the second workstation 3b are not described here. For example, object 2 enters environment 1 before the first workstation 3a and exits environment 1 after the second workstation 3b. However, other alternatives are possible.

[0029] In one embodiment, the location system includes at least one processor 6. Furthermore, the location system includes at least one anchor 5. This anchor 5 is fixed in environment 1. The anchor 5 includes a first communication module adapted to communicate with the processor 6. Any communication mode can be used to enable communication between the anchor 5 and the processor 6, such as GSM, TCP / IP, or others. The anchor 5 can also be mobile, provided that the anchor's position is determined or determinable by itself or by the processor 6. The anchor 5 is, for example, implemented in a smartphone.

[0030] At the processor 6 level, the location of anchor 5 is known. The location of anchor 5 can be stored in a memory 7 accessible to processor 6 during system configuration.

[0031] Anchor 5 can be characterized by an identifier. This can be particularly useful if the localization system includes several anchors. In this case, the identifier of each anchor is associated with its location.

[0032] In the example shown, the location system includes, for example, an anchor 5a fixed to the ceiling at the right of workstation 3a, and an anchor 5b fixed to the ceiling at the right of workstation 3b.

[0033] Anchor 5 further includes a second communication module 9. The second communication module 9 is adapted to communicate by radio waves with a tag 8 described later.

[0034] The location system also includes at least one label 8, such as is represented for example on the figure 2 .

[0035] Such a label 8 is flexible. By "flexible," we mean that the radius of curvature of the label 8 is less than 8 centimeters. The flexibility of the label 8 allows it to adapt more easily to different types of environments or objects 2, and to withstand significant mechanical stress without damage.

[0036] As depicted on the figure 2 The label 8 is typically an object with a thickness of approximately 1 to 3 millimeters (mm) and dimensions in the other two directions of approximately 1 to 10 centimeters (cm), or even larger as needed. The label 8 includes a main face 10 designed to be oriented towards a light source. As can be seen more precisely on the figure 3In exploded view, the label 8 comprises a flexible photovoltaic module 11 and a flexible printed circuit board 12. The photovoltaic module 11 and the flexible printed circuit board 12 are fixed to each other. For example, they can both be fixed to a flexible housing 34 of the label 8, for example, made of foam. Alternatively, the photovoltaic module 11 and the flexible printed circuit board 12 can be stacked one on top of the other. In one example, the photovoltaic module 11 is glued to the housing 34, and the flexible printed circuit board 12 is sandwiched between these two components. A recess 35 can be provided in the photovoltaic module 11 and / or the housing 34, which accommodates the surface-mounted electronic components of the flexible printed circuit board 12.

[0037] The flexible photovoltaic module 11 comprises one or more photovoltaic cells 13. Organic photovoltaic cells, also known by the acronym "OPV", are provided for example. These photovoltaic cells 13 comprise a layer of material that transforms the incident light radiation into electricity, a series of first electrodes on a first face, for example the main face 10 of the label 8, and a series of second electrodes on a second face 16 opposite the first face 10. The series of first electrodes is electrically connected to a first electrical contact 17, and the series of second electrodes is electrically connected to a second contact 18.

[0038] The flexible printed circuit board 12 includes a flexible insulating substrate 19 carrying electronic components 20. The substrate 19 has a first face 21 and a second face 22 opposite the first face 21. In the example shown, the second face 22 is turned away from the photovoltaic module and carries the electronic components 20. The electronic components 20 are thus positioned between the housing 34 and the flexible substrate 19, and are thereby protected. The substrate 19 also carries electronic traces for the electrical connection of the electronic components 20. The flexible printed circuit board 12 has a first electrical contact 23 intended to be electrically connected to the first electrical contact 17 of the photovoltaic module 11. This electrical connection is made, for example, via an electrical wire 24 or a conductive ribbon.The flexible printed circuit board 12 includes a second electrical contact 25 intended to be electrically connected to the second electrical contact 18 of the photovoltaic module 11. This electrical connection is made, for example, by means of an electrically conductive adhesive, if the electrical contacts 18 and 25 are juxtaposed. Other implementations of electrical connection between the photovoltaic module 11 and the flexible printed circuit board 12 include, for example, the use of two electrical wires or conductive tapes, or the use of conductive adhesive for each contact. In Alternatively, the electronic components 20 are arranged on the face 21 of the flexible printed circuit 12 facing the photovoltaic module 11. A layer of foam can then be provided between the flexible printed circuit 12 and the photovoltaic module 11.

[0039] As depicted on the figure 5The flexible printed circuit board 12 carries an electronic circuit that includes a load 29 comprising at least one processor 26 and a communication module 27 adapted to communicate by radio waves with the second communication module 9 of the anchors 5. The load 29 may also include a sensor (not shown). This could, for example, be an ambient temperature sensor. The load 29 may also include one or more light-emitting diodes (LEDs). The communication module 27 includes an antenna 36 drawn on the flexible printed circuit board 12. The load 29 is designed to consume a very low electrical current. For example, the average electrical current consumed by the load is less than 10 microamperes (µA). The average electrical current includes episodes of peak consumption and episodes of very low consumption. The episodes of peak consumption are spaced out over time.For example, the duty cycle of load 29, from the active time period to the operating period, is less than 0.01. In addition, the electrical current consumed during the active period, corresponding to the signal emission, is very low, for example less than 10 milliamperes (mA). In particular, the communication module 27 of tag 8 and the second communication module 9 of anchor 5 are complementary modules, enabling wireless communication, via radio waves, between these two modules.

[0040] The load 29 of the electronic circuit carried by the flexible printed circuit board 12 does not include a battery, nor is it connected to a battery or to a charging connector that can be plugged into an external charger.

[0041] The flexible printed circuit board 12 is supplied with electrical energy by the photovoltaic module 11. More specifically, the photovoltaic module 11 charges a supercapacitor 30 which is used to power the load 29 (comprising at least the processor 26 and the communication module 27). The supercapacitor 30 is, for example, an electrochemical double-layer capacitor (known by the acronym "EDLC" for "Electrochemical double-layer capacitor"). According to an exemplary embodiment, as shown in the figure 5 A capacitor can be used in parallel with the supercapacitor 30. This capacitor could be, for example, another supercapacitor 30, or even, as shown, two other supercapacitors 30, or a capacitor with low internal resistance. This reduces the equivalent resistance of this portion of the circuit, and therefore reduces the risk of the input voltage of the downstream analog comparator circuit dropping below V_UVLO-.

[0042] An electronic protection circuit 37 is interposed between the photovoltaic module 11 and the supercapacitor 30 to prevent the supercapacitor 30 from discharging back into the photovoltaic module 11 and to protect the photovoltaic module 11 when the voltage across the supercapacitor 30 exceeds the voltage supplied by the photovoltaic module 11. For example, a circuit known as TRCB (True Reverse Current Blocking), such as that described in US2013 / 063,116, incorporated herein in its entirety by reference for any purpose, may be used. An analog comparator circuit 28 is interposed between the supercapacitor 30 and the load 29.

[0043] In one embodiment, the analog comparator circuit 28 is used to ensure that the photovoltaic module 11 only supplies power to the load 29 if the delivered voltage is above a predetermined minimum threshold voltage V_UVLO+. The initial power supply to the load 29 creates an energy inrush that causes the voltage delivered by the supercapacitor 30 to drop. If this inrush causes the voltage to drop below a predetermined value V_UVLO-, the load 29 would no longer be properly powered, and the load 29 would not start correctly and could be damaged. The value of the predetermined minimum threshold voltage V_UVLO+ is such that the voltage drop due to the start-up of the load 29 does not cause the voltage delivered by the photovoltaic module 11 to fall below said predetermined value V_UVLO-.

[0044] Once charging has started, the supercapacitor 30 provides the load with an input voltage greater than V_UVLO-, as long as it is sufficiently charged.

[0045] Thus, the flexible printed circuit board 12 does not include a maximum power point tracking (MPPT) circuit. The absence of MPPT eliminates the energy consumption required for its operation.

[0046] There figure 6This illustrates a load supply cycle during variations in ambient illumination. The x-axis represents time, and the y-axis represents the output voltage of the supercapacitor 30. It is assumed that time t=1 corresponds to an instant when label 8 changes from complete darkness to exposure to light, natural or artificial, for example sunrise, access to light (removal of a cover or mask from the photovoltaic module), switching on artificial lighting, etc... in an initial state where the supercapacitor 30 is completely discharged.

[0047] During the first phase P1, above a certain luminance level, for example 50 lux, the photovoltaic module 11 charges the supercapacitor 30, and the voltage across it increases until it reaches the voltage V_UVLO+. This stage can typically last at least 15 minutes, particularly in the case of sunrise. At this point, the analog comparator circuit 28 detects that the voltage Vin is greater than V_UVLO+ and allows the load 29 to be powered, enabling it to start. Due to the start-up, the voltage Vin drops to a value V_Qinit greater than V_UVLO-. The load 29 then operates.

[0048] Regularly, during this P2 operating phase, the processor 26 commands the communication module 27 to transmit. The communication frequency is, for example, on the order of one communication every second to one communication every hour, or even one communication every second to one communication every minute. The communication module 27 transmits, for example, an identifier of the label 8. If the label 8 has a sensor, the communication module 27 can also transmit the value of at least one recent measurement from the sensor. The second communication module 9 of an anchor 5 detects the transmitted signal. This is particularly the case if an anchor 5 is close to the label 8. If the system includes several anchors 5, it is possible that only some, or even just one, of the anchors 5 will detect the signal transmitted by the label 8.

[0049] As seen on the figure 6, during this second phase P2, the light power arriving on the photovoltaic module is greater than a threshold power, and the load 29 is powered by the photovoltaic module 11.

[0050] At a certain point, the available light power falls below the threshold power. This can occur, for example, at sunset, during a power outage, or when the photovoltaic module 11 is shaded (for example, covered by an opaque object). In this third phase P3, the supercapacitor 30 continues to supply power to the load 29. As long as the voltage drops but remains above V_UVLO-, the load 29 continues to be powered and to operate.

[0051] Once the voltage Vin falls below V_UVLO-, the analog comparator circuit 28 detects that the voltage Vin is below V_UVLO- and cuts off the power supply to the load 29. Thus, the analog comparator circuit 28 implements hysteresis to compare the voltage Vin to a threshold voltage V_UVLO+ for powering the load 29 and to a threshold voltage V_UVLO- lower than V_UVLO+ to cut off the power supply to the load 29. In a fourth phase P4, the load 29 is no longer powered and ceases to function. However, for example, the light level remains sufficient for the supercapacitor 30 to continue delivering a non-zero voltage.

[0052] The supercapacitor 30 is sized according to environment 1, so that cases where the voltage Vin becomes less than V_UVLO- remain exceptional.

[0053] In a fifth phase P5, the photovoltaic module 11 receives light again. It is assumed that this light power is low, and less than the power required for the operation of the load 29. The voltage Vin increases while remaining below V_UVLO+, and the load 29 remains off.

[0054] At a certain point, as described above, the analog comparator circuit 28 detects that the voltage Vin is greater than V_UVLO+, and allows the load 29 to be powered, enabling it to start. Due to the start-up, the voltage Vin drops to a value V_Qinit greater than V_UVLO-. The load 29 then operates, in this sixth phase P6.

[0055] However, since the light output is less than the operating power of load 29, the voltage Vin drops, in this sixth phase P6, to V_UVLO-. The analog comparator circuit 28 detects that the voltage Vin is less than V_UVLO-, and cuts off the power supply to load 29.

[0056] The operation of label 8 can continue according to the principles presented above.

[0057] The processor 26 can be programmed to control the power supply to one or more LEDs on the label according to certain predefined conditions. For example, if sufficient power is available, the processor 26 controls the lighting of an LED, for example periodically.

[0058] In one embodiment, the processor 26 is programmed to perform processing based on a power supply parameter. The power supply parameter is, for example, a value of the voltage delivered by the photovoltaic module 11, which can be provided as an analog input to the processor 26. Depending on the power supply parameter, the processor 26 can perform one or both of the following functions. The processor 26 can modify the communication frequency of the communication module 27, for example, spacing out the communications if the power supply parameter indicates a power supply drop. The processor 26 can modify the nature of the information communicated, for example, reducing the information communicated to the bare minimum (the tag identifier) ​​if the power supply parameter indicates a power supply drop.Processor 26 can modify the activation parameters of a light-emitting diode (LED), for example, turning on the LED if the power parameter indicates a power drop. Processor 26 can also modify the operation of electronic components, for example, cutting off the power to a sensor if the power parameter indicates a power drop.

[0059] Label 8 is therefore not very sensitive to variations in illumination in the environment (alternation of day / night or summer / winter, passing clouds, additional or non-additional use of artificial lighting, frequency of use and nature thereof, distance of the label from the light sources, etc.).

[0060] According to one alternative embodiment, as shown on the figure 5, the electronic circuit carried by the flexible printed circuit board 12 includes a safety electronic component 38 adapted to limit the output voltage of the photovoltaic module 11 applied to the supercapacitor 30.

[0061] According to one embodiment, the electronic circuit carried by the flexible printed circuit board 12 includes a surface-mounted solid-state battery upstream of the supercapacitor 30.

[0062] According to one alternative embodiment, as shown on the figure 5 The electronic circuit carried by the flexible printed circuit board 12 includes a passive component 39 between the analog comparator circuit 28 and the load 29. This passive component 39, of the diode type for example, prevents an uncontrolled low voltage from supplying the load 29, outside the operating ranges.

[0063] Regularly, the anchors 5 communicate to the processor 6, via their communication module, the signals they have received from the tags 8 and the identifiers of those tags. The processor 6 determines the position of a tag 8 based on the known position of an anchor 5 or the anchors 5 that have detected it.

[0064] The system described above can be used in an environment 1 where it is necessary to regularly determine the position of objects 2. To do this, an object 2 is attached to a label 8. There are various ways to attach it. Preferably, the side of the label 8 with the photovoltaic module 11 remains facing the ambient light during this attachment. For example, the object 2 is placed in a tray, and the label 8 is attached to the tray. Alternatively, the correctly oriented label 8 can be placed in a flexible, translucent sleeve attached to the tray (which also contains, for example, paper documents relating to the object 2, such as traceability or quality control documents). The sleeve is, for example, fixed to the outside of the side of the tray, thus allowing the trays to be stacked while still allowing the labels 8 to be exposed to light.

[0065] In Alternatively, label 8 may have an adhesive side (the side opposite side 10) that can be attached by gluing to object 2 or to an object attached to it. Label 8 may then have a peelable film (not shown) that is removed before being attached by gluing to object 2. The flexibility of label 8 allows it to be glued to a non-flat and / or rough surface of object 2, and therefore adaptable for different uses.

[0066] The processor 6 includes a computerized control module adapted to control the labels 8 present in environment 1.

[0067] For example, the computerized control module accesses a checklist of tag IDs 8 entered by an operator and likely to be present in the environment, and compares this with the IDs of tags 8 whose position has been determined over a predetermined period of time. If the computerized control module determines that the position of a tag 8 on the checklist has not been determined, this may mean that the tag 8 is unexpectedly outside of environment 1 or more, which is powered by solar energy. The computerized control module can then issue an alarm signal or notification including at least the ID of that tag 8.

[0068] If memory 7 includes previous positions determined for this label 8, the notification may include the last position determined for label 8.

[0069] For example, when object 2 enters the environment, it is assigned a label 8, and label 8 is added to the identifier checklist. When object 2 leaves the environment, it is unassigned the label 8, and the label is removed from the identifier checklist.

[0070] In another embodiment, the computerized control module compares the actual route of a tag with a programmed route for that tag. In a first example, a programmed route includes a maximum duration for a tag to remain at a given position. Based on a plurality of tag position detections, the computerized control module determines the tag's route and compares it with the programmed route. If there is a difference between the detected route and the programmed route, an alarm signal or notification can be issued. This notification may include the position of the tag in question, or even its identifier.

[0071] Thus, if it is determined that a tag spends more time than expected in a given position, an alarm can be issued with the position identified.

[0072] Other solutions are possible. LIST OF REFERENCE SIGNS

[0073] 1: Environment 2: Object 3: Workstation 4: Artificial lighting 5: Anchor 6: Processor 7: Memory 8: Label 9: Second communication module 10: Main face 11: Photovoltaic module 12: Flexible printed circuit board 13: Photovoltaic cells 14: First electrodes 15: Second electrodes 16: Second face 17: First electrical contact 18: Second electrical contact 19: Substrate 20: Electronic components 21: First face 22: Second face 23: First electrical contact 24: Electrical wire 25: Second electrical contact 26: Processor 27: Communication module 28: Analog comparator circuit 29: Load 30: Supercapacitor 31: Enclosure 32: Translucent surface 33: Interrupt system 34: Housing 35: Housing 36: Antenna 37: Electronic protection circuit 38: Electronic safety component 39: passive component

Claims

1. System for locating labels in an environment, comprising: - at least one anchor (5), adapted to be arranged in the environment, and comprising at least one anchor communication module, - at least one flexible label (8), the flexible label comprising: . a flexible printed circuit (12) comprising at least one label communication module (27) adapted to communicate with the anchor communication module, and an electrical connection member (23, 25) of the printed circuit, . a flexible photovoltaic module (11) assembled to the flexible printed circuit (12), the flexible photovoltaic module (11) comprising a photovoltaic layer and at least one electrical connection member (17, 18) adapted for electrical connection to the electrical connection member (23, 25) of the printed circuit, the printed circuit (12) further comprising a supercapacitor (30) interposed between the printed circuit electrical connection member (23, 25) and the label communication module (27), wherein the flexible printed circuit (12) comprises an analog comparator circuit (28) between the supercapacitor (30) and the label communication module (27), and having a hysteresis triggering the power supply to the label communication module (27) for a first input voltage, and suspending the power supply to the label communication module (27) for a second input voltage lower than the first input voltage.

2. The system for locating labels of claim 1, wherein the flexible printed circuit (12) comprises at least one capacitance in parallel with the supercapacitor (30).

3. System for locating labels according to one of claims 1 to 2, wherein the flexible printed circuit (12) comprises an electronic protection circuit (37) between the photovoltaic module (11) and the supercapacitor (30).

4. System for locating labels according to one of claims 1 to 3, wherein the label (8) further comprises a flexible housing (34) assembled to the flexible printed circuit (12) and to the flexible photovoltaic module (11), the flexible printed circuit (12) being interposed between the housing (34) and the flexible photovoltaic module (11).

5. System for locating labels according to one of claims 1 to 4, in which the flexible printed circuit (12) comprises a processor (26) adapted to implement a processing dependent on a parameter of the power supply of the flexible printed circuit (12) by the photovoltaic module (11).

6. A system for locating labels according to one of claims 1 to 5, further comprising a processor (6) adapted to determine a position of the label (8) from a communication received at the anchor communication module.

7. A system for locating labels according to claim 6, wherein the processor (6) comprises a computerized control module adapted to issue a notification after comparing the received communications with a control list or a programmed route for a label (8).

8. Flexible label, including: . a flexible printed circuit (12) comprising at least one label communication module (27) adapted to communicate with an anchor communication module, and an electrical connection member (23, 25) of the printed circuit, . a flexible photovoltaic module (11) assembled to the flexible printed circuit (12), the flexible photovoltaic module (11) comprising a photovoltaic layer and at least one electrical connection member (17, 18) adapted for electrical connection to the electrical connection member (23, 25) of the printed circuit, the printed circuit (12) further comprising a supercapacitor (30) interposed between the printed circuit electrical connection member (23, 25) and the label communication module (27), characterized in that the flexible printed circuit (12) comprises an analog comparator circuit (28) between the supercapacitor (30) and the label communication module (27), and having a hysteresis triggering the power supply to the label communication module (27) for a first input voltage, and suspending the power supply to the label communication module (27) for a second input voltage lower than the first input voltage.