EP2949037A1 - Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable - Google Patents

Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable

Info

Publication number
EP2949037A1
EP2949037A1 EP14743944.2A EP14743944A EP2949037A1 EP 2949037 A1 EP2949037 A1 EP 2949037A1 EP 14743944 A EP14743944 A EP 14743944A EP 2949037 A1 EP2949037 A1 EP 2949037A1
Authority
EP
European Patent Office
Prior art keywords
drive
error condition
input line
voltage
frequency
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.)
Withdrawn
Application number
EP14743944.2A
Other languages
German (de)
English (en)
Other versions
EP2949037A4 (fr
Inventor
Nathan Thomas WEST
Benjamin James SYKORA
David Marshall FOYE
Korwin Jay ANDERSON
William James WATERS
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.)
Trane International Inc
Original Assignee
Trane International Inc
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 Trane International Inc filed Critical Trane International Inc
Publication of EP2949037A1 publication Critical patent/EP2949037A1/fr
Publication of EP2949037A4 publication Critical patent/EP2949037A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/50—Reduction of harmonics

Definitions

  • BACKGROUND Variable frequency drives offer a number of potential advantages for heating, ventilation, air conditioning, or refrigeration (HVACR) applications including opportunities for enhanced efficiency, control, and performance. Yet they also pose a number of design challenges including the need to mitigate harmonic losses due to power line input harmonic currents and/or terminal voltages.
  • Various techniques have been proposed to mitigate harmonics including link chokes, line reactors, multiphase techniques, harmonic filters, and combinations of these and other techniques. Active harmonic attenuation, cancellation or damping techniques may also be used to mitigate harmonics.
  • AHM active harmonic mitigation
  • exemplary controls and diagnostics include operating a variable frequency drive which converts an AC input line voltage to a DC voltage, generates a motor drive signal using the DC voltage, and drives an electric motor with the motor drive signal.
  • a harmonic mitigation signal is provided to the drive and is configured to at least partially mitigate harmonics during the operation of the drive.
  • the harmonic mitigation signal is inhibited based upon presence of an error condition associated with the drive input.
  • the inhibiting is terminated based upon the absence of the error condition.
  • a diagnostic fault condition is based upon a number of occurrences of the error condition.
  • FIG. 1 is a schematic of an exemplary HVACR system.
  • Fig. 2 is a schematic of an exemplary variable frequency drive and permanent magnet motor.
  • Figs. 3 and 4 are flow diagrams illustrating exemplary control and diagnostic processes.
  • Fig. 5 is a block diagram illustrating exemplary controls and diagnostics.
  • FIG. 1 there is illustrated an exemplary HVACR system 100 which includes a refrigerant loop comprising a compressor 110, a condenser 120, and an evaporator 130.
  • Refrigerant flows through system 100 in a closed loop from compressor 1 10 to condenser 120 to evaporator 130 and back to compressor 110.
  • Various embodiments may also include additional refrigerant loop elements including, for example, valves for controlling refrigerant flow, refrigerant filters, economizers, oil separators and/or cooling components and flow paths for various system components.
  • Compressor 110 is driven by a drive unit 150 including a permanent magnet electric motor 170 which is driven by a variable frequency drive 155.
  • variable frequency drive 155 is configured to output a three- phase PWM drive signal
  • motor 170 is a surface magnet permanent magnet motor.
  • Use of other types and configurations of variable frequency drives and permanent magnet electric motors such as interior magnet permanent magnet motors are also contemplated. It shall be appreciated that the principles and techniques disclosed herein may be applied to a broad variety of drive and motor configurations including inductance motor systems, reluctance motor systems and other motor systems.
  • Condenser 120 is configured to transfer heat from compressed refrigerant received from compressor 110.
  • condenser 120 is a water cooled condenser which receives cooling water at an inlet 121, transfers heat from the refrigerant to the cooling water, and outputs cooling water at an output 122.
  • other types of condensers may be utilized, for example, air cooled condensers or evaporative condensers.
  • references herein to water include water solutions comprising additional constituents unless otherwise limited.
  • Evaporator 130 is configured to receive refrigerant from condenser 120, expand the received refrigerant to decrease its temperature and transfer heat from a cooled medium to the refrigerant.
  • evaporator 130 is configured as a water chiller which receives water provided to an inlet 131, transfers heat from the water to the refrigerant, and outputs chilled water at an outlet 132. It is contemplated that a number of particular types of evaporators and chiller systems may be utilized, including dry expansion evaporators, flooded type evaporators, bare tube evaporators, plate surface evaporators, and finned evaporators among others.
  • HVACR system 100 further includes a controller 160 which outputs control signals to variable frequency drive 155 to control operation of the motor 170 and compressor 1 10. Controller 160 also receives information about the operation of drive unit 150. In exemplary embodiments controller 160 receives information relating to motor current, motor terminal voltage, and/or other operational characteristics of the motor including those described herein below. It shall be appreciated that the controls, control routines, and control modules described herein may be implemented using hardware, software, firmware and various combinations thereof and may utilize executable instructions stored in a non-transitory computer readable medium or multiple non-transitory computer readable media. It shall further be understood that controller 160 may be provided in various forms and may include a number of hardware and software modules and components such as those disclosed herein. Furthermore, it shall be appreciated that controller 160 is one example of a controller which may be configured to implement the exemplary controls and diagnostics disclosed herein, in whole or in part in combination with other systems, modules or components.
  • FIG. 2 there is illustrated an exemplary circuit diagram for a variable frequency drive 200.
  • Drive 200 is connected to a power source 210, for example, a 400/480 VAC utility power supply which provides three-phase AC power to line filter module 220.
  • Line filter module 220 is configured to provide a sync signal and serve as an RF filter.
  • Three-phase AC power is then provided to a rectifier 290 which converts the AC power to DC power and provides the DC power to a DC bus 291.
  • the DC bus is connected to inverter 280.
  • rectifier 290, DC bus 291, and inverter 280 are shown as discrete blocks.
  • Inverter module 280 includes switches 285, 286 and 287 which are connected to the positive and negative lines of the DC bus 291.
  • Switches 285, 286 and 287 are preferably configured as IGBT and diode based switches, but may also utilize other types of power electronics switching components such as power MOSFETs or other electrical switching devices.
  • Switches 285, 286 and 287 provide output to motor terminals 275, 276 and 277.
  • Current sensors 281, 282 and 283 are configured to detect current flowing from inverter module 280 to motor 270 and send current information to ID module 293.
  • Voltage sensors are also operatively coupled with motor terminals 275, 276 and 277 and configured to provide voltage information from the motor terminals to ID module 293.
  • ID module 293 includes burden resistors used in connection with current sensing to set the scaling on current signals ultimately provided to analog to digital converters for further processing.
  • ID module 293 tells the VFD what size it is (i.e. what type of scaling to use on current post ADC) using identification bits which are set in hardware on the ID module 293.
  • ID module 293 also outputs current and voltage information to gate drive module 250 and also provides identification information to gate drive module 250 which identifies the type and size of the load to which gate drive module 250 is connected.
  • ID module 293 may also provide current sensing power supply status information to gate drive module 250.
  • ID module 293 may also provide scaling functionality for other parameters such as voltage or flux signals in other embodiments.
  • Gate drive module 250 provides sensed current and voltage information to analog to digital converter inputs of DSP module 260.
  • DSP module 260 processes the sensed current and voltage information and also provides control signals to gate drive module 250 which control signals gate drive module 250 to output voltages to boost modules 251, 252 and 253, which in turn output boosted voltages to switches 285, 286 and 287.
  • the signals provided to switches 285, 286 and 287 in turn control the output provided to terminals 275, 276 and 277 of motor 270.
  • DSP module 260 is one example of a controller which may be configured to implement the exemplary controls and diagnostics disclosed herein, in whole or in part in combination with other systems, modules or components.
  • Motor 270 includes a stator 271, a rotor 273, and an air gap 272 between the rotor and the stator.
  • Motor terminals 275, 276 and 277 are connected to windings provided in stator 271.
  • Rotor 273 includes a plurality of permanent magnets 274.
  • magnets 274 are configured as surface permanent magnets positioned about the circumference of rotor 273.
  • the rotor is typically constructed using the permanent magnets in such a way as essentially a constant magnetic flux is present at the surface of the rotor.
  • the electrical conductors forming the windings in the stator are disposed to produce a sinusoidal flux linkage.
  • Other embodiments also contemplate the use of other magnet configurations such as interior magnet configurations. It shall be understood that interior magnet configurations typically have different inductances in the q-axis and the d-axis.
  • Process 300 begins at operation 302 which initializes an active harmonic mitigation ("AHM") control process which is configured and executable to mitigate power line input harmonic currents and/or terminal voltages. From operation 302 process 300 proceeds to conditional 304 which evaluates whether a frequency F, such as the drive input line frequency, is above a minimum frequency MinF and below a maximum frequency MaxF. If conditional 304 returns false, process 300 proceeds to operation 306 which inhibits the AHM process. From operation 306 process 300 proceeds to operation 308 which tests whether a frequency range error FRE is greater than a threshold for frequency range errors THFRE. If conditional 308 returns false, process 300 proceeds to conditional 342.
  • AHM active harmonic mitigation
  • conditional 308 returns true, process 300 proceeds to operation 310 which sets a diagnostic fault DFRE equal to true and proceeds to conditional 342.
  • Conditional 342 tests whether the number of inhibit operations is greater than a limit on the number of inhibit operations Linhibit. If conditional 342 returns true, process 300 proceeds to operation 302 which reinitializes the AHM process or sends a signal indicating that a manual reset is needed. If conditional 342 returns false, process 300 returns to conditional 304. If conditional 304 returns true, process 300 proceeds to operation 312 which sets diagnostic DFRET equal to false. From operation 312 process 300 proceeds to operation 314 which tests for a lost sync signal condition. If conditional 314 returns true, process 300 proceeds to operation 316 which inhibits the AHM process.
  • process 300 proceeds to conditional 318 which tests whether the number of sync signal errors SSE is greater than a threshold THSSE. If conditional 328 returns false, process 300 proceeds to conditional 342. If conditional 328 returns true, process 300 proceeds to operation 330 which sets diagnostic fault code DSSE equal to true. From operation 330 process 300 proceeds to conditional 342. If conditional 342 returns false, process 300 proceeds to operation 340 which sets diagnostic fault code DSSE equal false. From operation 340 process 300 proceeds to conditional 342.
  • Process 400 begins at operation 402 which initializes an AHM process. From operation 402, process 400 proceeds to conditional 404.
  • Conditional 404 tests for a frequency error, a delta frequency error, a line voltage imbalance error, and/or an short term electrical disturbance error, such as an electrical transient, a voltage surge, a ring wave, an electrical fast transient burst, an RF conducted immunity, a voltage variation, a voltage dip, a voltage interruption, or a voltage notch among others. If conditional 404 returns false, process 400 proceeds to conditional 412. If conditional 404 returns true, process 400 proceeds to operation 406 which inhibits the AHM process.
  • process 400 proceeds to operation 408 which tests whether a diagnostic limit has been reached for the frequency error, the delta frequency error, the line voltage imbalance error, and/or the electrical transient error. If operation 408 returns false, process 400 proceeds to conditional 412. If conditional 408 returns true, process 400 proceeds to operation 410 which sets a diagnostic fault code. From operation 410 process 400 proceeds to conditional 412. Conditional 412 tests whether a limit on the number of inhibit operations has been reached. If conditional 412 returns true, process 400 returns to operation 402 which reinitializes the AHM process or sends a signal that a manual reset is needed. If conditional 412 returns false, process 400 returns to conditional 404.
  • FIG. 5 there is illustrated a block diagram of exemplary
  • AHM controls 500 Block 550 illustrates the inputs that are provided to line sync algorithm 530 and AHM algorithm 510 which include the amplitude, frequency, source impedance, external loads, waveshapes, noise and transients of the input line voltage provided to a variable frequency drive.
  • Line synch algorithm 530 utilizes the input information to provide synchronization information, for example, information indicating phase angle of an input line, to AHM algorithm 510.
  • AHM algorithm 510 also receives input from AHM oversight controls 520 and field adjustable AHM parameters 540.
  • AHM algorithm 510 utilizes the inputs it receives to provide a signal configured to mitigate current or voltage harmonics input from the line and/or current or voltage harmonics output to the motor, provide phase current balance, and provide a desired amount of DC bus ripple.
  • AHM algorithm 510 also outputs diagnostic information relating to the variable frequency drive and/or the overall system in which the drive is implemented.
  • AHM oversight controls 520 may implement a number of AHM inhibit criteria which inhibit, turn off, or suspend AHM functionality, and a number of AHM diagnostic criteria which set a diagnostic fault code and/or reset the AHM algorithm or the system in which it is implemented. Certain embodiments utilize the criteria listed in Table 1 below.
  • the frequency out of range condition may be determined with through evaluation of the line sync signal.
  • the loss of AHM sync signal may occur over one cycle, one-half cycle, or other numbers of cycles or open windows.
  • AHM sync signal errors may be determined based upon an evaluation of zero crossing events where a M zero crossing events, for example two zero crossing events, are expected per cycle and extra zero crossing events indicate an error state.
  • Certain embodiments utilize additional or alternate criteria for AHM oversight controls 520. Some embodiments criteria suspend, turn off or inhibit AHM functionality based upon the presence or detection of short term electrical disturbances, line voltage imbalance, incoming line frequency, and/or incoming line frequency rate of change.
  • the short term electrical disturbances may include an electrical transient, a voltage surge, a ring wave, an electrical fast transient burst, an RF conducted immunity, a voltage variation, a voltage dip, a voltage interruption, and a voltage notch among others.
  • Field adjustable AHM parameters 540 may include a number of calibratibles which may be utilized in controlling AHM functionality.
  • Exemplary calibratibles include on/off enable/disable calibratibles, gain settings for current regulators and other routines or devices, current injection limits, and calibratibles specifying one or more harmonics to be targeted for mitigation, among others.
  • AHM algorithm outputs 560 may include signals or commands configured to mitigate one or more input line harmonics such as input line harmonics and/or one or more output harmonics. Outputs 560 may also include signals or commands configured to enhance phase current balance and/or mitigate DC bus ripple. Outputs 560 further include diagnostics as to the state of the variable frequency drive such as those disclosed herein. Outputs 560 feed back to or influence inputs 550 in a closed loop fashion, though it shall be understood that open loop controls and diagnostics may also be utilized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention concerne des commandes et des diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable. Des commandes et des diagnostics donnés à titre d'exemple consistent à faire fonctionner un mécanisme d'entraînement à fréquence variable consistant à convertir une tension de ligne d'entrée CA en une tension CC, générer un signal d'entraînement de moteur à l'aide de la tension CC, et entraîner un moteur électrique à l'aide du signal d'entraînement de moteur. Un signal d'atténuation d'harmoniques est fourni au mécanisme d'entraînement configuré pour atténuer au moins partiellement des harmoniques au cours du fonctionnement du mécanisme d'entraînement. Le signal d'atténuation d'harmoniques est inhibé sur la base de la présence d'une condition d'erreur associée à l'entrée d'entraînement. L'inhibition est terminée sur la base de l'absence de la condition d'erreur. Une condition de défaut de diagnostic est basée sur un certain nombre d'occurrences de la condition d'erreur.
EP14743944.2A 2013-01-22 2014-01-22 Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable Withdrawn EP2949037A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361755197P 2013-01-22 2013-01-22
PCT/US2014/012431 WO2014116627A1 (fr) 2013-01-22 2014-01-22 Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable

Publications (2)

Publication Number Publication Date
EP2949037A1 true EP2949037A1 (fr) 2015-12-02
EP2949037A4 EP2949037A4 (fr) 2016-03-23

Family

ID=51227974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14743944.2A Withdrawn EP2949037A4 (fr) 2013-01-22 2014-01-22 Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable

Country Status (3)

Country Link
EP (1) EP2949037A4 (fr)
CN (1) CN105075106B (fr)
WO (1) WO2014116627A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1014253A (ja) * 1996-06-25 1998-01-16 Hitachi Ltd インバータ付き空気調和機
JP2006296114A (ja) * 2005-04-13 2006-10-26 Yaskawa Electric Corp 電力変換装置の電源周波数異常検出装置および方法
EP2034605B1 (fr) * 2006-08-31 2012-03-28 Mitsubishi Electric Corporation Dispositif de commande de moteur électrique, et dispositif de commande de compresseur
US8156757B2 (en) * 2006-10-06 2012-04-17 Aff-Mcquay Inc. High capacity chiller compressor
EP2432110B1 (fr) * 2009-04-23 2018-03-21 Mitsubishi Electric Corporation Dispositif de conversion de puissance
JP5119222B2 (ja) * 2009-08-31 2013-01-16 株式会社日立産機システム コンバータ装置、モータ駆動用モジュール及び冷凍装置
GB201003456D0 (en) * 2010-03-02 2010-04-14 Trw Ltd Current sensor error compensation
JP5615671B2 (ja) * 2010-11-09 2014-10-29 株式会社コロナ モータ制御装置およびモータ制御システム
EP2667503B1 (fr) * 2011-01-18 2021-06-09 Daikin Industries, Ltd. Appareil de conversion d'électricité
CN102185284B (zh) * 2011-05-18 2014-08-20 台达电子企业管理（上海）有限公司 变换装置保护方法、变换装置以及保护装置

Also Published As

Publication number Publication date
WO2014116627A1 (fr) 2014-07-31
CN105075106B (zh) 2018-01-16
EP2949037A4 (fr) 2016-03-23
CN105075106A (zh) 2015-11-18

Similar Documents

Publication Publication Date Title
US10003287B2 (en) Magnet degradation and damage controls and diagnostics for permanent magnet motors
JP4969653B2 (ja) 交流直流変換装置及びその装置を用いた圧縮機駆動装置並びに空気調和機
EP2779406B1 (fr) Convertisseur de puissance et climatiseur comportant celui-ci
JP5119222B2 (ja) コンバータ装置、モータ駆動用モジュール及び冷凍装置
JP2012231672A (ja) モーター駆動制御装置、圧縮機、送風機、空気調和機及び冷蔵庫又は冷凍庫
EP2961051B1 (fr) Circuit de survoltage, module d'entraînement de moteur et appareil de réfrigération
WO2014103745A1 (fr) Circuit d'amplificateur, module de commande moteur et équipement frigorifique
JPWO2011121653A1 (ja) コンバータ装置，モータ駆動用モジュール、及び冷凍機器
EP2073373A2 (fr) Procédé pour contrôler le moteur d'un climatiseur
US9595905B2 (en) Refrigerant compressor drives offering enhanced robustness, efficiency and rated voltage operability
US9654049B2 (en) Variable frequency drive active harmonic mitigation controls and diagnostics
WO2014120651A1 (fr) Commande de multiples charges permettant une atténuation d'harmoniques de variateur de fréquence électronique
JP6085102B2 (ja) モータ制御装置、およびそれを用いた空気調和機
WO2014116627A1 (fr) Commandes et diagnostics d'atténuation d'harmoniques actifs de mécanisme d'entraînement à fréquence variable
KR20190051331A (ko) 전력변환장치 및 이를 구비하는 공기조화기
WO2015111517A1 (fr) Appareil de conversion d'énergie, équipement et système d'équipement
CN116670995A (zh) 电力转换装置、马达驱动装置以及制冷循环应用设备
KR20190075621A (ko) 모터 구동장치 및 이를 구비하는 공기조화기
KR20190108000A (ko) 전력변환장치 및 이를 구비하는 공기조화기
WO2019244228A1 (fr) Convertisseur de courant électrique, dispositif d'entraînement de moteur et dispositif de réfrigération
JPWO2015033427A1 (ja) 空気調和装置
JP2015023785A (ja) 電力変換装置、及び空気調和装置
KR20190107997A (ko) 전력변환장치 및 이를 구비하는 공기조화기
KR20190076668A (ko) 전력변환장치 및 이를 구비하는 공기조화기
KR20160086695A (ko) 전력변환장치, 및 이를 구비하는 공기조화기

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150803

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

A4 Supplementary search report drawn up and despatched

Effective date: 20160224

RIC1 Information provided on ipc code assigned before grant

Ipc: H02P 27/06 20060101AFI20160218BHEP

Ipc: H02M 1/12 20060101ALI20160218BHEP

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20170823

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180103