EP0306437A2 - Circuit hacheur pour l'alimentation de bobines d'électro-aimant et/ou de moteurs pas à pas, en particulier pour une imprimante - Google Patents

Circuit hacheur pour l'alimentation de bobines d'électro-aimant et/ou de moteurs pas à pas, en particulier pour une imprimante Download PDF

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Publication number
EP0306437A2
EP0306437A2 EP88730168A EP88730168A EP0306437A2 EP 0306437 A2 EP0306437 A2 EP 0306437A2 EP 88730168 A EP88730168 A EP 88730168A EP 88730168 A EP88730168 A EP 88730168A EP 0306437 A2 EP0306437 A2 EP 0306437A2
Authority
EP
European Patent Office
Prior art keywords
current
driver circuit
digital control
control logic
input
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Withdrawn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
EP88730168A
Other languages
German (de)
English (en)
Other versions
EP0306437A3 (fr
Inventor
Manfred Ing. Grüner (grad)
Franz Riedl
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0306437A2 publication Critical patent/EP0306437A2/fr
Publication of EP0306437A3 publication Critical patent/EP0306437A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/32—Energising current supplied by semiconductor device
    • H01H47/325—Energising current supplied by semiconductor device by switching regulator

Definitions

  • the invention relates to a chopper circuit for the control of electromagnetic and / or stepper motor coils, in particular for a matrix printer, the inductance of which, in conjunction with the applied voltage, generates a maximum current, but which is set lower by a desired factor, the current ripples being caused by chopping can be generated.
  • the control of electromagnetic coils in matrix printheads takes place via driver circuits, the task of which is to build up the magnetic field as quickly as possible and to allow it to swing out as quickly as possible when physically unavoidable counterinductions (DE-PS 31 39 502).
  • the aim here is more to be able to energize the electromagnetic coil again in order to cause the same pressure needle to be fired at shorter intervals, i.e. to achieve faster printing.
  • the object of the invention is therefore to change the current ripples generated during chopping as a function of the frequency, inductance and resistance of an electromagnetic coil or a magnetic coil winding, i.e. optimally set.
  • a driver circuit for the electromagnetic coil or a bridge circuit for the stepper motor coil is assigned a current measurement value acquisition with current cutoff, and in that digital control logic is provided which is switched in time with an upstream frequency transmitter Control signal generated, which is in interaction with the power cut as an on or off signal at the input of the driver circuit or the bridge circuit. Due to the predetermined frequency, which is adapted to the inductance and the resistance of the coil, it is possible to generate the on or off signal at the input of the driver circuit or the bridge circuit. In other words, such a digital control logic together with the current measurement value acquisition / current shutdown enables the range of action of the electromagnetic or stepper motor coils for different frequencies.
  • the digital control logic consists of an RS flip-flop (reset / set), the only output line of which is fed back to the reset input. Due to this teaching, considerable savings are made in the necessary lines or connection poles.
  • the line used for this as input and output has the advantage that only half of the lines or connection poles that are otherwise required are required.
  • the current measured value acquisition consists of a comparator, the positive input of which is connected to a reference voltage and the negative input of which is connected to a sensor resistor, and that the output of the comparator is linked to the digital control logic and to the input of the driver circuit.
  • Another improvement of the invention provides that the digital control logic is part of an ASIC and that the driver circuit, the current measurement value acquisition and the current cutoff are arranged separately. Such an embodiment allows the digital control logic to be made part of a single chip.
  • the pulse curve A (FIG. 1) triggers a logic "1" at the higher level and a logic "0" at the lower level.
  • the frequency pulse curve F shows the currently set frequency via negative control signals 2.
  • the associated frequency generator 3 is indicated in FIG. 2.
  • the frequency generator 3 generates a constant frequency.
  • the voltage pulse curve B occurs at the output 4 as an on signal, logic "1” or as an off signal, logic "0".
  • voltage pulses 6 of the same size are set. Accordingly, the chopper curve J shows a chopped current profile 7 with current ripples 7a in accordance with the voltage profile according to the voltage pulse curve B.
  • the chopper circuit for a pressure needle electromagnetic coil 8 with an inductance has a driver circuit 9 with a driver transistor Tr, furthermore a current measurement value acquisition 10 with current cutoff 11 and finally digital control logic 12.
  • the frequency generator 3 generates the negative control signal 2 at constant time intervals that can be set via the frequency generator 3.
  • the digital control logic 12 consists of an RS flip-flop 14 (reset / set) which is provided with a single output line 15 which is fed back to the reset input 16.
  • the current value detection 10 has a comparator 17, via the positive input 18 of which a reference voltage 19 is connected and the negative input 20 of which is connected to a sensor resistor 21 (Rs).
  • the Output 22 of comparator 17 is linked to digital control logic 12 and to input 13 of driver circuit 9.
  • the digital control logic 12 on the one hand and the current measured value acquisition 10 or the current cutoff 11 and the driver circuit 9 are connected bidirectionally to one another.
  • the pulse curve (signal) A is switched to logic "1".
  • the negative control signals 2 cause a gate output I logic “1” and the gate output II logic “0".
  • the signal at the input 13 of the driver circuit 9 (voltage pulse curve B) otherwise also becomes logic “0", so that the following driver circuit 9 remains inactive.
  • the signal of the pulse curve A (controlled by a data source or a character generator) is set to logic "0” and the output (Q) of a gate II is also logic "0”
  • the output "Q" of a gate III set to logic "1”
  • likewise the output Q of a gate VI if this is connected to a pull-up resistor 23 and is connected to a higher voltage + U1.
  • the output 22 of the comparator 17 has a high resistance, because at this moment no current flows in the driver circuit 9.
  • the driver circuit 9 is activated.
  • the current increases in the driver circuit 9 and causes a voltage drop across the sensor resistor 21 (Rs) which, after the reference voltage 19 has been reached, the output 22 of the comparator 17 to logic "0" and the output 4 and the gate input V also to logic "0""pulls.
  • the driver circuit 9 is now inactive again, the current in the electromagnetic coil 8 decreasing again after an e-function.
  • the RS flip-flop 14 consisting of the gates I and II is reset again via the gates IV and V.
  • This blocking state of the driver circuit 9 is maintained until a signal of the frequency pulse curve F occurs due to a short (approx. 500 nsec) set pulse for the RS flip-flop 14.
  • the RS flip-flop output signal (Q) is then logic "0" and consequently the output of gate III is logic "1".
  • the driver circuit 9 is thus reactivated. This interplay continues until the pulse of the pulse curve A becomes logic “1” again and sets the driver circuit 9 inactive via a signal of the voltage pulse curve B with the logic level "0".
  • the chopper circuit for a stepper motor solenoid 26 (FIG. 4) operates as described above.
  • the reference numerals used in FIG. 1 and the associated description also apply to FIG. 3.
  • FIG. 4 shows the chopper circuit for a stepper motor.
  • the same reference numerals as in FIG. 2 also apply to FIG. 4 and the parts of the description belonging to FIG. 2.
  • the digital control logic 12 is double for the control of a stepper motor for each stepper motor solenoid 26. Accordingly, pulse curves A1 and A2 are available. As a result, there are two voltage pulse curves B1 and B2.
  • Each stepper motor solenoid 26 forms a bridge circuit 27.
  • a bridge branch considered in FIG. 3 is formed by transistors 24 and 29 or 25 and 28.
  • Freewheeling diode pairs 30 are connected to the stepper motor solenoids 26.
  • Inverting amplifiers 31 and 32 and non-inverting amplifiers 33 and 34 are respectively connected between the output lines 15 and the transistors 24, 29 or 25 and 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Stepping Motors (AREA)
  • Dot-Matrix Printers And Others (AREA)
EP19880730168 1987-08-12 1988-07-28 Circuit hacheur pour l'alimentation de bobines d'électro-aimant et/ou de moteurs pas à pas, en particulier pour une imprimante Withdrawn EP0306437A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3727283 1987-08-12
DE19873727283 DE3727283A1 (de) 1987-08-12 1987-08-12 Chopperschaltung fuer die ansteuerung von elektromagnet- und/oder schrittmotoren-spulen, insbesondere fuer einen matrixdrucker

Publications (2)

Publication Number Publication Date
EP0306437A2 true EP0306437A2 (fr) 1989-03-08
EP0306437A3 EP0306437A3 (fr) 1990-10-17

Family

ID=6333856

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880730168 Withdrawn EP0306437A3 (fr) 1987-08-12 1988-07-28 Circuit hacheur pour l'alimentation de bobines d'électro-aimant et/ou de moteurs pas à pas, en particulier pour une imprimante

Country Status (4)

Country Link
US (1) US4989116A (fr)
EP (1) EP0306437A3 (fr)
JP (1) JPS6464598A (fr)
DE (1) DE3727283A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663174A1 (fr) * 1990-06-08 1991-12-13 Syrelec Temporisateur multitension a plage de tensions d'alimentation etendue.
EP0472407A1 (fr) * 1990-08-21 1992-02-26 Seiko Epson Corporation Dispositif d'entraînement pour aiguilles d'impression

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904441A1 (de) * 1987-08-12 1990-08-23 Mannesmann Ag Chopperschaltung fuer die ansteuerung von elektromagnet- und/oder schrittmotoren-spulen, insbesondere fuer einen matrixdrucker
KR930011184B1 (ko) * 1990-08-03 1993-11-25 삼성전자 주식회사 해머 솔레노이드의 바이-레벨(Bi-Level) 구동회로
DE4106597C2 (de) * 1991-03-01 2000-02-17 Siemens Ag Steuerschaltung für Magnetspule
JPH0538847A (ja) * 1991-08-07 1993-02-19 Tokyo Electric Co Ltd ドツトプリンタヘツドの出力制御装置
US5237262A (en) * 1991-10-24 1993-08-17 International Business Machines Corporation Temperature compensated circuit for controlling load current
US5543632A (en) * 1991-10-24 1996-08-06 International Business Machines Corporation Temperature monitoring pilot transistor
US5245261A (en) * 1991-10-24 1993-09-14 International Business Machines Corporation Temperature compensated overcurrent and undercurrent detector
FR2689306B1 (fr) * 1992-03-24 1997-04-30 Valeo Electronique Circuit d'alimentation pour relais electromagnetique.
DE4434179A1 (de) * 1994-09-24 1996-03-28 Teves Gmbh Alfred Schaltungsanordnung zur Überwachung einer Steuerschaltung
US5898288A (en) * 1997-01-29 1999-04-27 Hewlett-Packard Company Inexpensive motion control using DC motors
DE10250359A1 (de) * 2002-10-29 2004-05-19 Infineon Technologies Ag Gleichspannungsschaltregler
HUE050529T2 (hu) * 2015-05-22 2020-12-28 Duerr Systems Ag Felületbevonó berendezés és hozzá kapcsolódó mûködési eljárás

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828678A1 (de) * 1978-06-30 1980-04-17 Bosch Gmbh Robert Verfahren und einrichtung zum betrieb eines elektromagnetischen verbrauchers, insbesondere eines einspritzventils in brennkraftmaschinen
AU526883B2 (en) * 1980-07-17 1983-02-03 Exploration Logging Inc. Direct current control in inductive loads
DE3129610A1 (de) * 1981-07-28 1983-02-17 Bosch und Pierburg System oHG, 4040 Neuss Steuerschaltung fuer stellglieder
US4453194A (en) * 1982-03-01 1984-06-05 International Business Machines Corporation Integrated power circuit with current sensing means
DE3438034A1 (de) * 1984-10-17 1986-04-24 Siemens Ag Schaltnetzteil fuer die speisung einer induktivitaet
DE3529742C2 (de) * 1985-08-20 1995-04-27 Bosch Gmbh Robert Vorrichtung zum Stellen des Stroms durch einen induktiven Verbraucher
DE3530966A1 (de) * 1985-08-30 1987-03-05 Bso Steuerungstechnik Gmbh Verstaerkerschaltung fuer elektromagnete von proportional- oder servoventilen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663174A1 (fr) * 1990-06-08 1991-12-13 Syrelec Temporisateur multitension a plage de tensions d'alimentation etendue.
EP0472407A1 (fr) * 1990-08-21 1992-02-26 Seiko Epson Corporation Dispositif d'entraînement pour aiguilles d'impression

Also Published As

Publication number Publication date
JPS6464598A (en) 1989-03-10
US4989116A (en) 1991-01-29
DE3727283A1 (de) 1989-02-23
EP0306437A3 (fr) 1990-10-17
DE3727283C2 (fr) 1993-06-17

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