EP1851849A1 - Procede et circuit pour detecter le courant d'un moteur electrique commande par modulation d'impulsions en largeur - Google Patents

Procede et circuit pour detecter le courant d'un moteur electrique commande par modulation d'impulsions en largeur

Info

Publication number
EP1851849A1
EP1851849A1 EP05821651A EP05821651A EP1851849A1 EP 1851849 A1 EP1851849 A1 EP 1851849A1 EP 05821651 A EP05821651 A EP 05821651A EP 05821651 A EP05821651 A EP 05821651A EP 1851849 A1 EP1851849 A1 EP 1851849A1
Authority
EP
European Patent Office
Prior art keywords
switching device
semiconductor switching
current
sample
hold member
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Withdrawn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
EP05821651A
Other languages
German (de)
English (en)
Inventor
Andreas Mueller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1851849A1 publication Critical patent/EP1851849A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
    • 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
    • H02P27/08—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 with pulse width modulation
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

Definitions

  • the invention is based on a method and a circuit arrangement for detecting the current of a fed from a DC power supply, controlled by pulse width modulation electric motor according to the preamble of claims 1 and 6, as they have become known for example from DE 197 56 461 A.
  • This document discloses a method for influencing the electrical power of a load with a pulse width modulated signal, the detection of a
  • the current detection evaluates the inductive voltage drop at an inductive element using an integrator, which adds up the current changes to the inductive element and from this provides a signal which is proportional to the current through the inductive load.
  • the current detection arrangement Upon the occurrence of an overcurrent, the current detection arrangement generates a signal which modifies the pulse width modulated signal for the control of the load current.
  • Pulse width modulation operated electric motor and because of the constantly alternating current pulses and current pauses, however, it is difficult to determine the actual height of the motor current without complex detection and evaluation measures and to realize an accurate current control.
  • the invention has for its object to realize using a low-cost analog control arrangement, a direct and accurate measurement of the current absorbed by the electric motor. This is achieved by the characterizing features of the preceding claims 1 and 6.
  • a particularly simple and inexpensive circuit construction is obtained by the fact that the semiconductor switching device used as well as the sample and hold element of the current detection of the same control unit, preferably directly controlled by the PWM control unit and in this case at least at the shutdown of the motor current, the signal for driving the semiconductor switching device is delayed. In this way, it is ensured that at the time of detection of the motor current in the form of the voltage drop at the arranged in the motor circuit shunt of the detection device still flows the full motor current.
  • the semiconductor switching device expediently switches on and off in a delayed manner relative to the sample and hold element. This is technically easy to implement; Measurement errors with small pulse widths are tolerable in practice.
  • both the semiconductor switching device and the sample and hold member are delayed on and off, wherein the delay is selected to be larger in the semiconductor switching device than in the sample and hold member. In this way, the turn-on of the semiconductor switching device can be attenuated more than would be necessary for the pure measurement process, so that the electromagnetic compatibility of the switching arrangement is improved.
  • a particularly expedient circuit arrangement results if both the semiconductor switching device and the shunt arrangement between the motor and the ground line of the DC voltage network and in this case the shunt arrangement, a sample and hold element (sample and hold) is connected in parallel.
  • the semiconductor switching device no control voltage, which is above the supply voltage and therefore causes additional costs for their provision, on the other hand, the
  • the delay of the signals are selected to be greater for both the driving of the semiconductor switching device and for driving the switch of the sample and hold element is carried out in a particularly simple manner by a respective low-pass, wherein the time constant ⁇ i of the low-pass filter for the semiconductor switching device needs than the time constant ⁇ 2 for the actuation of the switch of the sample and hold member, wherein expediently both switches are designed as MOSFETs - with large motor currents optionally with a parallel connection of several MOSFETs in the load circuit.
  • FIG. 1 shows a circuit arrangement for detecting the current of a fed from a DC power supply, controlled by pulse width modulation electric motor and in
  • FIG. 2 diagrams of the various control voltages, the resulting current through the semiconductor switching device and the administratleitives ⁇ (T 2 ) of the switching element of the sample and hold member.
  • FIG. 1 denoted by 10 is a DC motor, which serves as a drive for the fan of a motor vehicle.
  • the engine will - A -
  • the motor current Il flows from the positive pole 12 of the DC voltage network via a supply line 16 to the electric motor 10 and from this first via a semiconductor switching device 18 in the form of a single or optionally also a plurality of parallel-connected MOSFETs Tl and a shunt 20 and a ground line 22 to the lying on ground Negative pole 14 of the DC voltage network.
  • a freewheeling diode 24 is connected in parallel to the electric motor 10.
  • the shunt device 20 is designed as a low-impedance precision resistor and supplies a measurement voltage XJ SH , which can be fed to a capacitor 26 via a switch T2.
  • the switch T2 is also a MOSFET, which together with the
  • Capacitor 26 forms a sample and hold circuit for the shunt voltage U SH .
  • the gate electrodes of both MOSFETs Tl and T2 are driven by the same PWM control unit, wherein, however, a low pass of a resistor 28 and a capacitor 30 between the PWM control unit 32 and the gate electrode of the MOSFET Tl has a larger time constant ⁇ i> ⁇ 2 than a parallel-arranged low pass having a resistor 34 and a capacitor 36 between the PWM control unit 32 and the gate electrode of the MOSFET T2 of the sample and hold member.
  • the switching arrangement according to the invention is completed by a current regulator 38 and a voltage regulator 40.
  • the current regulator 38 receives at its inputs on the one hand, the charging voltage of the capacitor 26 and on the other hand, a voltage value corresponding to a predetermined desired value of the motor current I so u.
  • At the inputs of the voltage regulator 40 are the terminal voltage of the motor 10 and a target voltage U so u corresponding to the predetermined
  • the output of the voltage regulator 40 is on the one hand to the input of the PWM control unit 32 and on the other hand connected via a rectifier element 42 to the output of the current regulator 38.
  • the circuit operates as follows:
  • the fan blower of a motor vehicle air conditioning system shown schematically, are at the input of the voltage regulator 40, a target voltage U so u and the hereby to be compared terminal voltage of the motor 10th
  • the PWM control unit 32 is driven and supplies at its output pulse width modulated control signals U PWM for the gate of the semiconductor switching device 18 in the form of the MOSFET switch Tl.
  • the drive signals U PWM are not directly but via a low pass from the resistor 28 and the capacitor 30 as the control voltage U T i to the gate of the MOSFET Tl.
  • Parallel to the low-pass with the resistor 28 and the capacitor 30 is located at the output of the PWM control unit 32, a second low pass of a resistor 34 and a capacitor 36 which delays the gate of the further MOSFET switch T2 with the output of the PWM control unit 32nd connects.
  • the dimensioning of the resistors and capacitors of the two low-pass circuits is chosen such that for the low-pass of the resistor 28 and the capacitor 30, a time constant ⁇ i results, which is greater than the time constant ⁇ 2 for the low-pass of the resistor 34 and the capacitor 36th
  • the resistors 28 and 34 are set equal in size, each having a resistance of 10 k ⁇
  • the capacitance of the capacitor 30 is twice that of the capacitor 36 having values of 100 pF and 50 pF, so that the time constant ⁇ i is twice as large is like the time constant ⁇ 2 .
  • the MOSFET switch Tl is in the exemplary embodiment for a load current of the motor leading semiconductor power switching device 18, which can be constructed at high motor currents and several parallel-connected MOSFET switches. in the
  • Motor circuit is still the shunt 20 at which a motor current Il corresponding voltage U SH drops.
  • the shunt 20 can be installed at any point of the load circuit.
  • the shunt 20 is connected directly to ground with one connection and is connected with its other connection to the source electrode of the MOSFET T1, so that at the shunt 20 only the measurement voltage in mV - Range and not the supply voltage UB is applied, whereby the measurement error is significantly reduced.
  • the MOSFET switch T2 lies with its drain electrode via a capacitor 26 likewise at the ground line 22 and with its source electrode at the terminal remote from the earth of the shunt 20, so that the switch T2 and the capacitor 26 is a sample and hold circuit (Sample and Hold) for the measuring voltage U SH at the shunt 20.
  • the facing away from the ground electrode of the capacitor 26 is connected to an input of the current controller 38, whose second input receives the setpoint value I as appropriate and the load current Ii reference value, while the output of the current regulator 38 is connected to the cathode of a diode 42 whose Anode at a connection 44 of the connecting line between the voltage regulator 40 and the PWM control unit 32 is located.
  • the output value of the current controller 38 and the input value of the PWM control unit 32 is lowered when the load current Ii exceeds the set value I so u and a compensating current flows from the terminal 44 via the diode 42 to the output of the current controller 38th
  • FIG. 2 shows, in a schematic form, the course of the various relevant voltages, the motor current Ii and the conductance K of FIG the charging current I 2 of the capacitor 26 leading switch T2 of the circuit arrangement according to the invention.
  • the uppermost diagram shows the circuit sequence determining output voltage U PWM of the PWM control unit 32.
  • a pulse of the control voltage U PWM lasts from the time t 0 to the time ti and determined
  • the switch-on point t 2 for the current Il and the earlier switch-on point t 4 for the current I 2 at the switch Tl In accordance with the switch-off points t 3 and t 5 in each case on half of the falling edges of the control voltages U T i and U ⁇ 2 , the switch-off point t 3 of the current Ii is later than the switch-off point t 5 of the current I 2 . In this way, it is ensured that the switch T2 in each case switches on earlier and earlier than the switch T1, so that the correct start and end value of the measuring voltage U SH are applied to the capacitor 26 acting as a holding element. In contrast, a delayed drop in the MOSFET switch T2 on the capacitor 26 would already be a reduced voltage drop across the shunt 20 due to a decaying motor current Ii via the switch Tl and lead to a false measurement result.
  • the shunt 20 on the side of the electric motor 10 facing the ground connection 14, because in this case the measuring voltage applied to the shunt 20 in the mV range is measured only with respect to ground and is not set in relation must be to the full voltage U B the DC voltage network, which is in applications in the motor vehicle at about 14 V and thus orders of magnitude above the measurement voltage U SH , to which they would have to be set in proportion.
  • the semiconductor switching device 18 on the ground-facing side of the electric motor 10. In this case, no gate voltage is required for the control of the MOSFET switch, which is above the mains DC voltage and would cause additional costs for their provision.
  • the inventive method and the associated circuit arrangement for measuring the current consumption of a fed from a DC power supply, controlled by pulse width modulation electric motor thus results in advantages that allow for mass production applications such as a Klimage blower motor for a motor vehicle significant cost savings.
  • the inexpensive analog components used thus replace an integrated circuit and in particular a microcontroller.
  • a motor current limit allows without additional effort.
  • the voltage drop produced by the motor current Ii at the shunt 20 can be precisely determined by detecting the peak value of the current Ii instead of an average because the sample and hold circuit is activated earlier than the power switch Tl and thus at the grounded current regulator terminal 46 a DC voltage is present, which is proportional to the motor current Ii.
  • the time constant ⁇ i must be on the one hand greater than the time constant ⁇ 2 , but on the other hand can be selected in that the electromagnetic compatibility of the circuit arrangement is improved by the delayed connection of the circuit breaker Tl. A small error in the measurement result with very small pulse width ratios is negligible in practice.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

La présente invention concerne un procédé et un circuit pour détecter le courant d'un moteur électrique (10) commandé par modulation d'impulsions en largeur et alimenté à partir d'un réseau à courant continu (12, 14). Ce moteur électrique peut être connecté au réseau à courant continu par l'intermédiaire d'un dispositif de commutation à semi-conducteur (18) et d'un dispositif de dérivation (20). Une chute de tension au niveau du dispositif de dérivation permet de faire varier la commande du dispositif de commutation à semi-conducteur. Selon cette invention, afin de déterminer et de réguler le courant du moteur (I<SUB>1</SUB>), la chute de tension (U<SUB>SH</SUB>) au niveau du dispositif de dérivation (20) est détectée par un élément de balayage et de maintien (T2, 26) et le dispositif de commutation à semi-conducteur est déconnecté au moins de manière retardée par rapport à l'élément de balayage et de maintien, afin d'assurer qu'une valeur de mesure proportionnelle à la grandeur effective du courant du moteur (I<SUB>1</SUB>) soit détectée et que la régulation soit basée sur celle-ci.
EP05821651A 2005-02-14 2005-12-14 Procede et circuit pour detecter le courant d'un moteur electrique commande par modulation d'impulsions en largeur Withdrawn EP1851849A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005006503A DE102005006503A1 (de) 2005-02-14 2005-02-14 Verfahren und Schaltungsanordnung zur Erfassung des Stromes eines durch Pulsweitenmodulation gesteuerten Elektromotors
PCT/EP2005/056770 WO2006084520A1 (fr) 2005-02-14 2005-12-14 Procede et circuit pour detecter le courant d'un moteur electrique commande par modulation d'impulsions en largeur

Publications (1)

Publication Number Publication Date
EP1851849A1 true EP1851849A1 (fr) 2007-11-07

Family

ID=35996351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05821651A Withdrawn EP1851849A1 (fr) 2005-02-14 2005-12-14 Procede et circuit pour detecter le courant d'un moteur electrique commande par modulation d'impulsions en largeur

Country Status (3)

Country Link
EP (1) EP1851849A1 (fr)
DE (1) DE102005006503A1 (fr)
WO (1) WO2006084520A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010029315A1 (de) 2010-05-26 2011-12-01 Robert Bosch Gmbh Verfahren zur elektronischen Kommutierung in Gleichstrom-Elektromotoren
EP2730022B8 (fr) 2011-07-07 2015-06-17 Robert Bosch GmbH Procede de commutation électronique en moteurs electriques dc

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5689162A (en) * 1995-06-07 1997-11-18 Sgs-Thomson Microelectronics, Inc. Apparatus and method for current sensing for motor driver in pwm mode
US5650715A (en) * 1996-04-19 1997-07-22 Intel Corporation Method and apparatus for sensing current in power supplies
US5874818A (en) * 1997-06-11 1999-02-23 Agile Systems, Inc. Method and apparatus for sensing load current in a motor controller
US6069471A (en) * 1998-05-14 2000-05-30 Intel Corporation Dynamic set point switching regulator
DE10244522B4 (de) * 2002-09-25 2005-06-30 Karl Dungs Gmbh & Co. Kg Ansteuereinrichtung für eine Magnetspule

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006084520A1 *

Also Published As

Publication number Publication date
WO2006084520A1 (fr) 2006-08-17
DE102005006503A1 (de) 2006-08-24

Similar Documents

Publication Publication Date Title
DE102015105488B4 (de) System und verfahren für eine getaktete leistungsversorgung
DE112007001630B4 (de) Verfahren und Vorrichtung zur Bestimmung der Rotorposition bei einem bürstenlosen und sensorlosen Elektromotor
DE102004034462A1 (de) Einrichtung und Verfahren zur Motorsteuerung
DE102010030866A1 (de) Multiphasen DC/DC Aufwärtswandler
DE102005024068A1 (de) Verfahren zur Steuerung eines aus einem Gleichspannungsnetz gespeisten Elektromotors
DE102007031995A1 (de) Steuervorrichtung für ein Schaltgerät mit Anzugs- und/oder Haltespule sowie Verfahren zum Steuern des durch die Spule fließenden Stroms
EP1703629B1 (fr) Procédé pour la commande digitale de courant
EP1949114B1 (fr) Procede pour mesurer le courant d&#39;un moteur
DE102012209276B4 (de) Steuervorrichtunq für Halbleiterschalter eines Wechselrichters, Antriebssystem und Verfahren zum Ansteuern eines Wechselrichters
EP0556191B1 (fr) Circuit pour la commande d&#39;un servomoteur
DE102014018182A1 (de) Passives Eingangsfilter mit einstellbarer Klemmung für Shunt-Messungen
EP1531544B1 (fr) Méthode pour utiliser un moteur électrique controlé en PWM
DE102019210566B4 (de) Vorrichtung und Verfahren zum Messen eines durch eine PWM-angesteuerte induktive Last fließenden Stromes
EP1851849A1 (fr) Procede et circuit pour detecter le courant d&#39;un moteur electrique commande par modulation d&#39;impulsions en largeur
DE102011120841B4 (de) Wechselrichter mit Totzeitkorrektur sowie Verfahren zur Korrektur der Totzeit in einem Wechselrichter
EP3413459B1 (fr) Procédé de détection de blocage des moteurs électriques à commutation électrique
EP2582044B1 (fr) Mesure du courant de sortie d&#39;un circuit d&#39;amplification
EP1715573B1 (fr) Méthode et dispositif pour entrainer des charges électriques
EP2044682B1 (fr) Circuiterie de mesure de la consommation de courant d&#39;un moteur à courant continu commandé par modulation d&#39;impulsions en durée
EP0929925B1 (fr) Circuit pour commander un moteur avec un dispositif de reconnaissance de surcharge
DE202014009500U1 (de) Stromversorgung mit einem Schaltwandler
DE3809110C2 (de) Einrichtung zur Gasmassenstrommessung
DE102009047172A1 (de) Verfahren und Vorrichtung zur temperaturabhängigen Steuerung der Ausgangsleistung eines Kraftfahrzeuggenerators
DE102007028083A1 (de) pi-Filter mit Begrenzung des Eingangsstroms
DE102015216848A1 (de) Verfahren zum Betreiben eines piezoelektrischen Elements, Vorrichtung zur Durchführung des Verfahrens, Steuergerät-Programm und Steuergerät-Programmprodukt

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: 20070914

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR IT SE

DAX Request for extension of the european patent (deleted)
RBV Designated contracting states (corrected)

Designated state(s): DE ES FR IT SE

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: 20150701