EP1004953B1 - Dispositif de commande d'un générateur de courant - Google Patents

Dispositif de commande d'un générateur de courant Download PDF

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Publication number
EP1004953B1
EP1004953B1 EP19980122165 EP98122165A EP1004953B1 EP 1004953 B1 EP1004953 B1 EP 1004953B1 EP 19980122165 EP19980122165 EP 19980122165 EP 98122165 A EP98122165 A EP 98122165A EP 1004953 B1 EP1004953 B1 EP 1004953B1
Authority
EP
European Patent Office
Prior art keywords
current
generator
voltage
transistor
circuit
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.)
Expired - Lifetime
Application number
EP19980122165
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German (de)
English (en)
Other versions
EP1004953A1 (fr
Inventor
Stefan Hermann
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE59814063T priority Critical patent/DE59814063D1/de
Priority to EP19980122165 priority patent/EP1004953B1/fr
Publication of EP1004953A1 publication Critical patent/EP1004953A1/fr
Application granted granted Critical
Publication of EP1004953B1 publication Critical patent/EP1004953B1/fr
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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc
    • G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/26—Current mirrors
    • G05F3/262—Current mirrors using field-effect transistors only

Definitions

  • the invention relates to a circuit arrangement for operating a power generator.
  • a power generator is usually arranged between the poles of a power source.
  • the energy source is designed in particular as a DC voltage source. Operation of the power generator requires a minimum voltage drop on the power generator as the supply voltage.
  • a known circuit arrangement ( EP 0 793 343 A1 ) discloses a circuit block which generates a reference current depending on the value of an external resistor and the circuitry limits an output current in response to this reference current.
  • a circuit arrangement is known ( FR 2 750 244 A ), which measures a supply current of an electromagnetic actuator via a Hall sensor and thus adjusts the force of the electromagnetic actuator, regardless of voltage changes and influences of the air gap of the electromagnet.
  • Circuit arrangements are further known which describe the generation of a reference current proportional to a first current ( EP 0 647 894 A2 .
  • EP 0 715 239 A1 such as EP 0 760 555 A1 ).
  • a circuit arrangement which monitors a connection line of a current source for ground faults ( US 5,075,628A ).
  • This circuit has a current transformer and a Hall sensor.
  • the Hall sensor generates a fault current, which is detected by the transformer.
  • the object of the invention is to provide a supply voltage necessary for the operation of a power generator.
  • a current mirror circuit mirrors the generator current in a fixed ratio and feeds the mirrored current into a preferably high-impedance measuring resistor.
  • the current mirror circuit preferably contains a first transistor arranged in series with the current generator through which the generator current flows. The control input of this first transistor is connected to the control input of another transistor of the current mirror circuit, so that this second transistor is traversed by the measuring current proportional to the generator current.
  • the voltage drop at the power generator which are also regarded as the supply voltage of the power generator can, and the voltage drop across the current mirror circuit, so the voltage drop across the part of the current mirror circuit, which is arranged in series with the current generator - here the voltage drop across the first transistor, in sum, the voltage supplied by the DC voltage source.
  • the voltage drop at the first transistor and thus at the current mirror circuit is essentially dependent on the type of transistor used and its technology and is for example in a bipolar transistor 0.7 volts and in a transistor in MOS technology 3 to 3.5 volts. Due to the voltage drop across the current mirror circuit, the voltage drop across the current generator may fall below a minimum voltage required for proper operation of the power generator.
  • the power generator is preferably designed as a Hall sensor, which supplies a further usable measuring current as a generator current
  • the Hall sensor is only ready for operation, if a allergiesspsnnung of about 6 volts at the electrodes of the Hall sensor is applied.
  • the transistor of the current mirror circuit is designed as a transistor in MOS technology, a drain-source voltage of 3 volts usually drops across it. With an available battery voltage of 8 volts DC, the supply voltage at the Hall sensor is reduced to 5 volts. Thus, a perfect operation of the Hall sensor is no longer guaranteed.
  • the voltage drop across the current mirror circuit and in particular at the transistor of the current mirror circuit arranged in series with the current generator is regulated to a desired value.
  • the setpoint is dimensioned such that a minimum voltage drops on the power generator, which requires this for its operation.
  • the trouble-free operation of a power generator is ensured by the invention, since its supply voltage remains constant and in particular does not fall below a minimum voltage. On the other hand, remains unaffected by this voltage regulation of the generator current. It can be mirrored in an advantageous manner via the current mirror circuit in a predetermined ratio. The mirrored current is then fed to a measuring resistor, which preferably has a high resistance of greater than one kiloohm. The voltage drop across this measuring resistor is measured. Based on the voltage drop, the known resistance value of the measuring resistor and the known factor of the current mirror circuit, the generator current can be determined. The thus determined generator current can be used as a measured variable and processed as a control or controlled variable.
  • the power generator is designed as a Hall sensor.
  • the Hall sensor is used to determine the open or closed state of a buckle in the motor vehicle.
  • the single FIGURE shows a circuit diagram as an embodiment of the invention and its developments.
  • a trained as a DC voltage source with the poles + and - power source 1 provides a voltage of 12 volts.
  • This DC voltage source is for example the vehicle battery.
  • the circuit arrangement further includes a current generator 3 in the form of a Hall sensor, a current mirror circuit 5 with the transistors T1 and T2, a measuring resistor RM, a control device 4 and a further energy source 2 in the form of a DC voltage source which supplies 8 volts.
  • the power generator may generally be configured, for example, as a sensor, as an actuator or as an electrical component which can be charged with voltage, for example as a resistor.
  • the transistors T1 and T2 are formed as MOS field effect transistors with the terminals drain D, source S and gate / control input G.
  • the first transistor T1 is arranged in series with the current generator 3, the second transistor T2 in series with the measuring resistor RM. Both series circuits T1, 3 and T2, RM are arranged between the poles of the power source 1. The series circuits T1, 3 and T2, RM are arranged parallel to each other.
  • the supply voltage U3 drops.
  • the current generator 3 supplies the generator current I.
  • the measuring voltage UM drops at the measuring resistor RM; the measuring resistor RM is traversed by the measuring current IM.
  • the control device 4 is the control difference from a supplied from the further energy source 2 setpoint USOLL and the voltage at the node S1.
  • the voltage at the circuit point S1 is based on the negative potentials / poles of the energy sources 1 and 2, the voltage dropping across the first transistor T1 U5.
  • the exit the control device 4 is connected to the control inputs G of the transistors T1 and T2.
  • the circuit behaves in operation as follows:
  • the power generator supplies the Generaorstrom I, which represents in particular a measured variable.
  • the generator current I in a predetermined ratio, e.g. with the ratio one without amplification effect or with the ratio 20 with amplifying effect, mirrored and supplies the measuring current IM, which is fed into the measuring resistor RM.
  • the transistors T1 and T2 are the same type and thus provide the same current:
  • the mirror factor is one.
  • the measuring resistor is preferably high impedance.
  • the measuring voltage UM at the measuring resistor RM can be tapped and indirectly supplies the generator current I as a measured variable.
  • the voltage drop U5 of the current mirror circuit 5 is regulated by the control device 4 to a desired value USOLL.
  • the desired value USOLL is to be determined in such a way that the sum of the minimum voltage at the current generator and the voltage USOLL is smaller than the minimum voltage of the energy source 1.
  • the regulating device 4 is designed as a per se known regulator which acts on the transistors T1 and T2 as actuators ,
  • the current mirror voltage U5 is the controlled variable, which is returned. This achieves a constant voltage drop U5 between the circuit points S1 and S2 at the current mirror circuit and thus ensures a minimum supply voltage U3.
  • a regulation of the voltage at the circuit point S1 relative to the positive pole + the power source 1 is also protected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Control Of Eletrric Generators (AREA)

Claims (4)

  1. Disposition de circuit pour entraîner un générateur de courant, dans laquelle le générateur de courant (3) est disposé entre les pôles (+,-) d'une source d'énergie (1),
    comportant un circuit de miroir de courant (5) pour alimenter, avec un courant de mesure (IM) proportionnel au courant de générateur (I), une résistance de mesure (RM) sur laquelle peut être appliquée une tension de mesure (U1) qui est proportionnelle au courant de générateur (I),
    comportant un dispositif de réglage (4) pour régler la chute de tension (U5) au circuit de miroir de courant (5) sur une valeur de consigne (USOLL),
    dans laquelle le circuit de miroir de courant (5) contient un premier transistor (T1) en série avec le générateur de courant (3) et un deuxième transistor (T2) en série avec la résistance de mesure (RM),
    caractérisée en ce que le dispositif de réglage (4) agit directement sur l'entrée de commande (G) des transistors (T1, T2).
  2. Disposition de circuit suivant la revendication 1, dans laquelle la résistance de mesure (RM) et le deuxième transistor (T2) sont disposés entre les pôles (+,-) de la source d'énergie (1).
  3. Disposition de circuit suivant la revendication 1 ou 2, dans laquelle la chute de tension (U5) au premier transistor (T1) sert de grandeur de réglage.
  4. Disposition de circuit suivant l'une des revendications précédentes, dans laquelle le générateur de courant (3) est réalisé sous la forme d'un détecteur de Hall.
EP19980122165 1998-11-25 1998-11-25 Dispositif de commande d'un générateur de courant Expired - Lifetime EP1004953B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59814063T DE59814063D1 (de) 1998-11-25 1998-11-25 Schaltungsanordnung zum Betreiben eines Stromgenerators
EP19980122165 EP1004953B1 (fr) 1998-11-25 1998-11-25 Dispositif de commande d'un générateur de courant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980122165 EP1004953B1 (fr) 1998-11-25 1998-11-25 Dispositif de commande d'un générateur de courant

Publications (2)

Publication Number Publication Date
EP1004953A1 EP1004953A1 (fr) 2000-05-31
EP1004953B1 true EP1004953B1 (fr) 2007-07-18

Family

ID=8233015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980122165 Expired - Lifetime EP1004953B1 (fr) 1998-11-25 1998-11-25 Dispositif de commande d'un générateur de courant

Country Status (2)

Country Link
EP (1) EP1004953B1 (fr)
DE (1) DE59814063D1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645650B1 (fr) * 1989-04-06 1991-09-27 Merlin Gerin Systeme de controle d'isolement d'un reseau a courant continu
GB9320991D0 (en) * 1993-10-12 1993-12-01 Philips Electronics Uk Ltd A circuit for providing a current source
DE69427479T2 (de) * 1994-11-30 2002-01-17 Stmicroelectronics S.R.L., Agrate Brianza Hochgenauer Stromspiegel für niedrige Versorgungsspannung
DE69533696D1 (de) * 1995-08-31 2004-12-02 St Microelectronics Srl Strom-Generatorschaltung mit einem breiten Frequenzgang
EP0793343B1 (fr) * 1996-02-29 2001-07-18 Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno Circuit programmable avec limitation de courant pour les actuateurs de puissance
FR2750244B1 (fr) * 1996-06-20 1998-11-06 Clausin Jacques Dispositif de commande proportionnelle de force delivree par un electro-aimant independant des variations des tensions d'alimentation et des entrefes

Also Published As

Publication number Publication date
EP1004953A1 (fr) 2000-05-31
DE59814063D1 (de) 2007-08-30

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