FR3020679A1 - Detection device with optimized operation - Google Patents

Detection device with optimized operation Download PDF

Info

Publication number
FR3020679A1
FR3020679A1 FR1453993A FR1453993A FR3020679A1 FR 3020679 A1 FR3020679 A1 FR 3020679A1 FR 1453993 A FR1453993 A FR 1453993A FR 1453993 A FR1453993 A FR 1453993A FR 3020679 A1 FR3020679 A1 FR 3020679A1
Authority
FR
France
Prior art keywords
sensor
connected
voltage
detection device
power supply
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
Application number
FR1453993A
Other languages
French (fr)
Other versions
FR3020679B1 (en
Inventor
Frederic Bocage
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Electronics and Defense SAS
Original Assignee
Safran Electronics and Defense SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Safran Electronics and Defense SAS filed Critical Safran Electronics and Defense SAS
Priority to FR1453993 priority Critical
Priority to FR1453993A priority patent/FR3020679B1/en
Publication of FR3020679A1 publication Critical patent/FR3020679A1/en
Application granted granted Critical
Publication of FR3020679B1 publication Critical patent/FR3020679B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps, of tanks; Tyre cooling arrangements
    • B60C23/02Signalling devices actuated by tyre pressure
    • B60C23/04Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0408Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
    • B60C23/041Means for supplying power to the signal- transmitting means on the wheel
    • B60C23/0413Wireless charging of active radio frequency circuits

Abstract

A sensing device comprising a sensor for producing an electrical output signal in response to its environment, a power supply unit connected to the sensor by an output line, and an antenna by an input line for transforming a sinusoidal signal received by the antenna in at least one continuous signal supplying the sensor, and a modulation unit connected to the sensor and the input line for modulating an input impedance of the detection device according to the output signal of the sensor, power supply unit comprising at least one shunt diode for defining a reference voltage for supplying the sensor. The power supply unit comprises a multiplier arranged so that the voltage at the cathode of the reference voltage defining diode is always sufficient so that the reference voltage is substantially constant despite the impedance modulation applied by the unit. modulation.

Description

The present invention relates to a detection device such as a device for detecting the pressure of a tire of a vehicle wheel. There are detection devices that are powered by a remote acquisition device by means of alternating electromagnetic signals and which communicate with the acquisition device by these same signals. Such a detection device generally comprises at least one sensor for producing an electrical output signal in response to its environment, a power supply unit connected to the sensor by an output line and an antenna by an input line to transform an sinusoidal signal received by the antenna in a continuous supply signal of the sensor. The power supply unit comprises a rectifier bridge, a capacitor and at least one Zener diode or a regulator for defining a reference DC voltage for the power supply of the sensor. The detection device comprises a modulation unit connected to the sensor and to the input line for modulating the input impedance (in voltage and / or current) of the detection device according to at least one binary information characteristic of the measurements made by the sensor (eg back-scattering modulation). When the sensor is powered, it produces an output signal that depends on the reference voltage that powers it and the size at which the sensor is sensitive, such as the pressure of the air surrounding it. The detection device also comprises an analog-to-digital converter and an FPGA-type processing circuit for providing the output binary signal characteristic of the sensor measurements, as well as possibly monitoring measures of the detection device when it incorporates built-in test test means. The acquisition device, which corresponds to the remote computer which receives and processes the measurement or measurements made by the detection device, sends a sinusoidal signal to the input line of the detection device (possibly by a wire link such as a shielded twisted pair of large length and one or more electromagnetic couplings per antenna) for supplying the detection device when the acquisition unit needs measurements of the sensor. The binary output signal is transmitted to the acquisition device by the modulation unit which will cause a modulation of the input impedance of the detection device (or "back-scattering"), which modulation will be detected by the device in the form of amplitude variations in voltage or current of the sinusoidal signal supplied, this amplitude variation occurring at the same rate as the binary output signal transmitted by the detection device. Different types of binary coding can be used to transmit the information (eg NRZ, Manchester ...). The signal received by the acquisition device is then processed (demodulated and interpreted) to extract the binary output signal containing the measurement results made by the sensor of the detection device. Modulating the input impedance of the sensing device during transmission of the sinusoidal signal causes ripples in the input voltage of the sensing unit of the sensing device. These corrugations come on the one hand from a residual of the AC voltage received at the input by the antenna of the detection device and on the other hand from a variation of the input voltage induced by the modulation of the impedance of input of the detection device when transferring the data to the acquisition device. These ripples can be significant and disrupt the operation of the processing circuit, for example reduce the accuracy of the physical measurements made by the sensor. During voltage drops, the various components fed by the power unit pull on the capacitor whose voltage drops. The capacitor makes it possible to maintain the voltage at the input of the sensor at a level sufficient to supply the reference voltage of the sensor so that capacitance of the capacitor is decisive in maintaining the performance of the sensor. It has been thought, to secure the proper operation of the sensor, to increase the capacity of the capacitor, which allows better filter the residual of the AC component and reduce the impact of the voltage variation during modulation. This amounts to using a capacitor of greater bulk incompatible with the space available in the sensor, in particular for a pressure sensing application of a vehicle wheel tire. In addition, in this latter application, the operating temperature rises to 175 ° C for an aircraft landing gear wheel. However, at these temperatures, it is difficult to find capacitors of high capacity and small footprint, the technologies responding to this double constraint being incompatible with high temperatures. An object of the invention is to provide a means to ensure proper operation of such a detection device. For this purpose, there is provided, according to the invention, a detection device comprising a sensor for producing an electrical output signal in response to its environment, a power unit connected to the sensor by an output line and an antenna by an input line for transforming a sinusoidal signal received by the antenna into at least one continuous signal supplying the sensor, and a modulation unit connected to the sensor and the input line for modulating an input impedance of the input sensing device according to the output signal of the sensor. The power supply unit comprises at least one component for defining a reference voltage for supplying the sensor. The power supply unit comprises a multiplier arranged so that the output voltage thereof is always sufficient for the reference voltage to be substantially constant despite the impedance modulation applied by the modulation unit. Thus, the multiplier provides a voltage sufficient to power the sensor despite the voltage drops resulting from the modulation. The multiplier therefore makes it possible to increase the voltage level supplied by the antenna so that the output voltage level of the multiplier remains sufficient during the modulation. There is therefore no DC voltage drop during modulation. It is therefore not necessary to provide energy storage (high value capacity having a large footprint especially with the temperatures to reach) to maintain the power supply.

Other features and advantages of the invention will emerge on reading the following description of particular non-limiting embodiments of the invention. Reference will be made to the appended drawings, among which: FIG. 1 is a schematic view of the detection device according to the invention; FIG. 2 is a partial view of the electronic circuit of this detection device.

With reference to the figures, the invention is here described in application to a detection device, generally designated 1, intended to be mounted on a vehicle wheel for detecting the inflation pressure of a tire of this wheel. The detection device is arranged to be powered by an acquisition or control unit 100 mounted on a part of the vehicle supporting the wheel and to transmit an output signal to the control unit 100. The control unit 100 is connected to an antenna for example by a wired connection (shielded or not). Several successive couplings by antennas can also exist between the control device 100 and the detection device 1, for example to pass from the fixed part of the vehicle to the wheel.

The detection device 1 here comprises a sensor 10 (but the device could comprise several) arranged to produce an electrical output signal depending on the pressure of the gas contained in the tire, a supply unit 20 connected to the sensor 10 by an output line 30 and an antenna 40 by an input line 50, and a modulation unit 60 connected to the antenna 40 and the power supply unit 20 for modulating an input impedance of the detection device 1 according to the binary signal to be transmitted by the detection device. The power supply unit 20 is connected to the antenna 40 by an electromagnetic compatibility input stage 70 comprising, for example, a set of capacitors 71 in parallel for filtering the high frequency disturbances coming from the antenna 40. input stage is in the example mounted in common mode but the entire device could be set to differential mode. The sensor 10 comprises a pressure-sensitive element 11 arranged to be mounted on the tire valve, and an acquisition unit 12. The analog processing converter unit 14 for producing coding (here according to the method The processing circuit 14 used to parameterize the sensitive 11 is connected to a branch 31 of the acquisition line 12 comprises a digital 13 and a circuit of the binary output signal to Manchester) and to transmit. In addition, the converter can also be a converter 13. The output power unit 20 for receiving a voltage signal Vl and the input of the analog-to-digital converter 13. The analog-to-digital converter 13 is connected to the processing circuit 14 to receive its setting and / or return the acquired data. The processing circuit 14 is of the FPGA type (or alternatively microcontroller) and is connected to the power supply unit 20 by a branch 32 of the output line 30 to receive a voltage signal V2 and by a branch 33 of the output line 30 for receiving a voltage signal V3. The voltages V2 and V3 are the voltages necessary for the operation of the processing circuit 14 (input-output voltages and voltage of the digital core of said processing circuit 14). The digital analog converter 13 is powered by the voltage V1 and further uses the voltage signal Vl as the reference voltage of the analog-digital converter for digitizing the signal coming from the sensitive element 11 in order to obtain a ratio-metric measurement of the physical quantity measured by the sensor. The processing circuit 14 is arranged to transmit, according to a predefined protocol, the commands necessary to define the acquisition parameters of the analog-to-digital converter 13, to start the acquisition, to recover the data acquired, to code the data and to modulating the input impedance of the detection device via the modulation stage. In general, the detection device also comprises a reset device making it possible to guarantee a level of the different power supplies sufficient to guarantee proper operation as well as a clock signal generator 80 making it possible to generate a clock signal H for the signal circuit. processing 14 from the AC signal recovered via the antenna 40 of the detection device. The actual reinitialization of the sensor being managed by the breaking of the AC voltage at the output of the control unit 100. When the reset signal is active, it causes the interruption of the operation of the processing circuit 14. sensor 10 is known in itself, it will not be described here. The modulation unit 60 is connected to the processing circuit 14 and to the input line 50, between the input stage 70 and the supply unit 20. The modulation unit 60 comprises a resistor 61 arranged to be used to generate an impedance modulation on the input line 50 (so-called back-scattering process). The processing circuit 14 drives a MOS transistor 62 connected to the resistor 61 of the modulation unit 60 in such a way that the impedance modulation corresponds to the binary output signal constructed by the processing circuit 14 and is detectable by the control unit 100. Of course, other modulation principles can be proposed and for example the modulation of a capacity by a bidirectional switch. The power supply unit 20 is arranged to transform a sinusoidal signal received by the antenna 40 for example into three continuous signals supplying the sensor 10, namely the signals V1, V2, V3. The signals V1, V2, V3 come from three voltage-defining circuits 21, 22, 23 respectively. Each voltage-defining circuit 21, 22, 23 comprises a shunt regulator (also called a shunt diode) 211, 221, 231 and a capacitor 212, 222, 232 connected in parallel with the shunt regulator 211, 221, 231. The voltage V1 is worth for example 3.3 V, voltage V2 2.5 V, voltage V3 1.2 V.

These devices can be improved by adding transistor to stabilize the shunt regulators by limiting the current flowing through them. The power supply unit 20 comprises a multiplier 24 arranged so that the voltage at the cathode of the shunt regulators 211, 221, 231 is always sufficient for the voltage of the voltage signals V1, V2, V3 to be substantially constant despite the modulation of the voltage. impedance applied by the modulation unit 60. This is achieved by ensuring that a sufficient current (and not zero) passes in the shunt regulators 211, 221, 231 regardless of the consumption of the loads on these regulators and whatever the input voltage of the detection device. The multiplier 24 comprises a first input capacitor or capacitor 241 connected in series with the input line 50 and with the anode of a first diode 242 whose cathode forms the output of the multiplier 24. The multiplier 24 also comprises a second capacitor 243 connected to the anode of the diode 242 and to the ground and a second diode 242 'having an anode connected to the ground and a cathode connected between the capacitor 241 and the cathode of the diode 242. The multiplier 24 thus ensures a multiplication (here by a factor of about 2) and a recovery of the input voltage. The capacitor 243 also makes it possible to perform a first smoothing of the input voltage supplied by the antenna 40, which greatly reduces the residual ripple of the current supplied to the remainder of the circuit via the resistor 244 mounted at the output of the multiplier 24. This thus makes it possible to have a better dynamic stability of the voltages V1, V2 and V3 provided by the shunt regulators 211, 221 and 231. The resistor 244 is optional and can therefore optionally be omitted. At the output of the multiplier 24 is connected, via the resistor 244, a current generator 25 for setting an intensity of the constant current flowing in the detection device on the line 30 and therefore in the voltage-defining circuits 21, 22, 23, and more generally in all circuits of the device consuming current. The intensity is set at the maximum value necessary for the proper functioning of the device and which is defined by the maximum current consumed at the output of the different shunt regulators and the minimum current necessary for the proper operation of these shunt regulators. The current generator 25 comprises in series on the line 30 a resistor 251 and a transistor 252 having its emitter connected to the resistor 251 and its collector connected to the voltage-defining circuit 22. The current generator 25 also comprises a first branch extending between the line 30 upstream of the resistor 251 and the ground and having in series a resistor 253 connected to the ground, a transistor 254 connected to the resistor 253 by its collector and a shunt regulator 255, connected to the transmitter of the transistor 254. The current generator 25 further comprises a second branch extending between the base of the transistor 252 and the ground and having a resistance connected to the ground at the base of the transistor 252 and the base of the transistor 254. The transistors 254 and 252 are paired to obtain near base-emitter voltages over the entire operating temperature range of the sensing device. The voltage across the resistor 251 is then substantially equal to the reference voltage of the shunt regulator 255, which defines the current consumed at the output of the multiplier 24, the consumption in the branch of the regulator 255 being kept negligible thanks to the value of 253. This assembly has the advantage of stabilizing the overall consumption of the detection device regardless of the amplitude of the input voltage obtained via the antenna 40. The current generator thus has a current limiting function which ensures a substantially constant consumption regardless of the input voltage (which is potentially highly variable) and to limit the unnecessary dissipation in the voltage references when the input voltage is high (the series transistor of the current limiter will potentially be the only component providing significant dissipation).

The different capacities of the power supply unit 20 are chosen so as to limit the ripples of the voltage signals V1, V2, V3. Capacitors are here ceramic capacitors whose temperature resistance is adapted to the conditions of use of the detection device 1 (up to 175 ° C in operation). With the multiplier 24 the main function of these capacitors is no longer energy storage but filtering, which allows to greatly limit the value and therefore the size.

The detection device 1 also comprises a generator 80 of a clock signal H (already mentioned above) sent to the processing circuit 14. The generator 80 is connected to the input line 50 and receives the voltage signal V2 . The clock signal H is conventionally used by the processing circuit 14 during its operation. The generator 80 here comprises a resistor 81 connected to the ground and to the anode of a first diode 82 whose cathode is connected to the input line 50 between the input stage 70 and the modulation unit 60. A second diode 83 has its cathode connected to the output line branch 32 and its anode connected between the resistor 81 and the anode of the first diode 82. The signal H is taken from the anode of the diode 83. The anode of the first diode 82 is then subjected to the input voltage while the anode of the second diode 83 is then subjected to the voltage V2. This arrangement makes it possible to supply a clock signal to the processing unit 14 based on the frequency of the signal received by the antenna 40 and with voltage levels compatible with the supply voltage V2 of the processing unit 14. A logic gate may be added between the clock circuit 80 and the processing circuit 14 to limit the impact of the leakage currents at the input of the processing circuit 14.

The invention makes it possible to guarantee this good operation even with a high variability of the voltage received by the antenna 40 at the input of the detection device, by greatly reducing the residual level of the AC input voltage and by canceling out any voltage variation. during modulation, with a reduced sensor surface and in a harsh environment (high temperature). Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims. In particular, the current generator is not essential and could be replaced for example by a current limiting resistor whose value would be defined by the same constraints on consumption. This circuit 25 may also consist of a current mirror structure. The resistor 61 can be replaced by any impedance allowing a modification of the input impedance of the detection device.

Resistor 244 is optional. The reset circuit may also require a logic gate to match the input leakage current of the processor unit 14.

The whole of the input structure, including the multiplier, can be in differential mode structure according to the requirements of resistance to electromagnetic environments and lightning. Other multiplier structures are furthermore conceivable. The invention is usable in the context of the detection of other physical quantities than the pressure and for example the measurement of tire gas temperature in parallel with the pressure measurement or a measurement of deformation. More generally, the invention is applicable to the supply of a sensor via an antenna, in particular in the case of a modulation of the measurement result by back-scattering or any method of modulation of the input signals of the sensor ( voltage, current, impedance), regardless of the physical quantity detected.

Claims (5)

  1. REVENDICATIONS1. A sensing device comprising a sensor for producing an electrical output signal in response to its environment, a power supply unit connected to the sensor by an output line, and an antenna by an input line for transforming a sinusoidal signal received by the antenna in at least one continuous signal supplying the sensor, and a modulation unit connected to the sensor and the input line for modulating an input impedance of the detection device according to the output signal of the sensor, power supply unit comprising at least one component for defining a reference voltage for supplying the sensor, characterized in that the power supply unit comprises a multiplier arranged so that the output voltage thereof is still sufficient for the reference voltage to be substantially constant despite the impedance modulation applied by the modulation unit.
  2. The device of claim 1, wherein the multiplier (24) comprises a first capacitor (241) connected in series with the input line (50) and the anode of a first diode (242) having a cathode forming the output of the multiplier, a second capacitor (243) connected to the anode of the first diode and ground and a second diode (242 ') having an anode connected to ground and a cathode connected between the first capacitor (241) ) and the cathode of the first diode (242).
  3. 3. Device according to claim 1 or claim 2, wherein the defining component of the reference voltage is a zener diode or a shunt regulator.
  4. 4. Device according to claim 3, in which a capacitor is connected in parallel with the component for defining the reference voltage.
  5. 5. Device according to claim 1, wherein the power supply unit comprises a current generator (25) for setting an intensity of the current flowing in the detection device, in order to limit the power consumption of the detection device as well as the heat dissipation of the components that constitute it, while guaranteeing the function.
FR1453993A 2014-04-30 2014-04-30 Detection device with optimized operation Active FR3020679B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR1453993 2014-04-30
FR1453993A FR3020679B1 (en) 2014-04-30 2014-04-30 Detection device with optimized operation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1453993A FR3020679B1 (en) 2014-04-30 2014-04-30 Detection device with optimized operation

Publications (2)

Publication Number Publication Date
FR3020679A1 true FR3020679A1 (en) 2015-11-06
FR3020679B1 FR3020679B1 (en) 2018-11-02

Family

ID=51063690

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1453993A Active FR3020679B1 (en) 2014-04-30 2014-04-30 Detection device with optimized operation

Country Status (1)

Country Link
FR (1) FR3020679B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2441502A1 (en) * 1978-11-20 1980-06-13 Pappas Dennis Insufficient tyre pressure alarm device - has pressure sensor at each wheel transmitting to receiver in driver's cabin
FR2817509A1 (en) * 2000-12-05 2002-06-07 Trw France Car tire state measuring system having wheel detector with tuned frequency moving antenna and central unit with fixed proximity antenna providing transponder monitoring.
FR2852556A3 (en) * 2003-03-18 2004-09-24 Whetron Ind Co Ltd Car tire pressure and temperature sensing device, has pressure and temperature sensor supplied with power in capacitor, and microprocessor activating alarm to inform driver for stopping car if sensed value exceeds standard value
EP1870261A1 (en) * 2006-06-22 2007-12-26 Silicon Valley Micro C Corporation Tire parameter monitoring system with inductive power source
US20100134269A1 (en) * 2008-11-28 2010-06-03 Silicon Valley Micro C Corporation Tire parameter monitoring system with sensor location using RFID tags
US20130285647A1 (en) * 2012-04-30 2013-10-31 Terry Pennisi Self powered wireless system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2441502A1 (en) * 1978-11-20 1980-06-13 Pappas Dennis Insufficient tyre pressure alarm device - has pressure sensor at each wheel transmitting to receiver in driver's cabin
FR2817509A1 (en) * 2000-12-05 2002-06-07 Trw France Car tire state measuring system having wheel detector with tuned frequency moving antenna and central unit with fixed proximity antenna providing transponder monitoring.
FR2852556A3 (en) * 2003-03-18 2004-09-24 Whetron Ind Co Ltd Car tire pressure and temperature sensing device, has pressure and temperature sensor supplied with power in capacitor, and microprocessor activating alarm to inform driver for stopping car if sensed value exceeds standard value
EP1870261A1 (en) * 2006-06-22 2007-12-26 Silicon Valley Micro C Corporation Tire parameter monitoring system with inductive power source
US20100134269A1 (en) * 2008-11-28 2010-06-03 Silicon Valley Micro C Corporation Tire parameter monitoring system with sensor location using RFID tags
US20130285647A1 (en) * 2012-04-30 2013-10-31 Terry Pennisi Self powered wireless system

Also Published As

Publication number Publication date
FR3020679B1 (en) 2018-11-02

Similar Documents

Publication Publication Date Title
CN104396222B (en) For passing through method and the equipment of single signal operate accessory interface function
CN105379120B (en) It is detected using Δ/Σ conversion capacitive proximity
TWI565183B (en) Wireless power receiving unit, wireless power transmitting unit, and method for wireless load modulation
CN105324914B (en) Wireless power supply and its control method
US20150255995A1 (en) Physical Property Sensor With Active Electronic Circuit And Wireless Power And Data Transmission
JP4742103B2 (en) Insulation resistance detector
US7168624B2 (en) Semiconductor device and IC card
ES2543787T3 (en) Battery system of batteries with simplified supervision
US10309841B2 (en) Temperature detecting apparatus
US8797701B2 (en) Electronic load for testing voltage stability
US20130057408A1 (en) Utility meter arc detection system
DE112011101945T5 (en) Robust capacitive measuring system
US9212951B2 (en) Object detection device
DE102014004791B3 (en) Method for checking a connection between a low-voltage network and a battery and motor vehicle
WO2012130990A1 (en) Device for measuring a supply voltage in electric vehicles
EP2806253B1 (en) Measuring arrangement for determining a measured variable
JP5697233B2 (en) Environmental information measuring apparatus, environmental information measuring system, and environmental information measuring method
TWI481144B (en) Method of sensing current signal for supplying-end module of induction type power supply system
JP6348573B2 (en) Pressure detection device
CN101762335B (en) Temperature detection circuit
CN102288322B (en) Differential thermistor circuit
EP2879023B1 (en) Capacitive stylus pen
JP6319294B2 (en) Management device, communication device, management method, and management system
JP6337468B2 (en) Ground fault detection device
CN102298345B (en) Communication method of M-BUS (meter-BUS)

Legal Events

Date Code Title Description
PLFP Fee payment

Year of fee payment: 2

PLSC Search report ready

Effective date: 20151106

PLFP Fee payment

Year of fee payment: 3

CD Change of name or company name

Owner name: SAFRAN ELECTRONICS & DEFENSE, FR

Effective date: 20170111

PLFP Fee payment

Year of fee payment: 4

PLFP Fee payment

Year of fee payment: 5

PLFP Fee payment

Year of fee payment: 7