WO2001017086A1 - Circuit de protection pour un montage en serie constitue d'un commutateur de fin de course a semi-conducteur de puissance et d'un moteur - Google Patents

Circuit de protection pour un montage en serie constitue d'un commutateur de fin de course a semi-conducteur de puissance et d'un moteur Download PDF

Info

Publication number
WO2001017086A1
WO2001017086A1 PCT/DE2000/002933 DE0002933W WO0117086A1 WO 2001017086 A1 WO2001017086 A1 WO 2001017086A1 DE 0002933 W DE0002933 W DE 0002933W WO 0117086 A1 WO0117086 A1 WO 0117086A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
peak
pwm
power semiconductor
reference voltage
Prior art date
Application number
PCT/DE2000/002933
Other languages
German (de)
English (en)
Inventor
Harald Eisenhardt
Rolf Falliano
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 WO2001017086A1 publication Critical patent/WO2001017086A1/fr

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
    • H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
    • 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

Definitions

  • the invention relates to a protective circuit for a series circuit comprising a power semiconductor limit switch and a motor as an inductive consumer, in which the power semiconductor limit switch can be switched on and off by a PWM controller by means of pulse-width-modulated control signals.
  • Power semiconductor limit switches and the motor are protected against overloads. This is particularly important for the motor as it can be overloaded and damaged or destroyed if it is difficult to move or is blocked. It is known to assign an independent overload protection to the motor, in particular the motor winding.
  • PWM blower controllers are also known which implement motor protection by linear operation when predetermined protection characteristics are exceeded, but which require more control effort and require higher power losses.
  • a reference voltage which is proportional or quasi-proportional to the pulse width ratio can be derived from the PWM control signal, which with a peak measuring voltage corresponding to the peak current through the power semiconductor limit switch or with the peak voltage occurring at the power semiconductor limit switch Peak drain voltage is compared, and that the pulse width ratio is reduced if the reference voltage is exceeded.
  • the protection can be increased further in that the activation of the power semiconductor limit switch can be switched off at least for a predetermined or predeterminable period of time if the peak measuring voltage or the peak drain voltage exceeds the reference voltage derived from the PWM control signals despite a reduction in the PWM ratio , With this protection circuit, a complete one is only used in PWM mode
  • the protective circuit takes advantage of the knowledge that the peak currents in the series circuit consisting of a power semiconductor limit switch and motor, in contrast to the average current values, are not better proportional to the pulse width ratio and are therefore better suited to differentiate between normal operation and failure.
  • the protective circuit is of particular advantage, especially in the case of a small pulse width ratio, since in this case, when the average current values are detected, very high demands must be placed on the measuring accuracy of the measuring device in the PWM blower controller in order to be able to reliably perform a protective function.
  • the protective circuit uses a reference voltage which is completely proportional to the pulse width ratio of the PW control signals or at least quasi-proportional and which defines the maximum permissible limit curve for the peak current. If the peak current exceeds or falls below this specification, the pulse width ratio of the PWM control signals is reduced until a stable, uncritical operating state is reached or the control of the power semiconductor limit switch by the PWM control is switched off at least for a predetermined or predeterminable time, so There must be no thermal overload for the power semiconductor limit switch and the connected motor.
  • the peak measuring voltage is derived and applied to a measuring resistor which is looped into the series circuit comprising the power semiconductor limit switch and the motor a capacitor charged by the voltage drop across this measuring resistor via a resistor is detected as the peak charging voltage.
  • the peak currents can also be detected by tapping the peak drain voltage at a capacitor as a peak charging voltage, which is charged via a resistor from the voltage drop at the drain-source path of the power semiconductor limit switch.
  • the capacitors are not absolutely necessary, but are only used advantageously to suppress interference spikes.
  • the proportional reference voltage can be derived via a semiconductor switch which can be controlled by the PWM control signal and controls the charging circuit of a capacitor and that the charging voltage of the capacitor represents the reference voltage or that the quasi-proportional reference voltage can be specified by the PWM controller in binary stages in accordance with the pulse width ratio.
  • the detection of a limit value for the peak current is indicated in that the reference voltage and the peak measuring voltage or the peak drain voltage can be fed to a comparison circuit which, when the reference voltage is exceeded or undershot by the peak measuring voltage or the peak voltage. Drain voltage outputs an output signal to the PWM controller.
  • a further development has proven to be advantageous, which is characterized in that the comparison circuit is provided with a latching circuit which maintains the output signal for the PWM control after the comparison circuit has responded.
  • the derivation of a quasi-proportional reference voltage from the pulse width ratio of the PWM control signals is achieved in such a way that the quasi-proportional reference voltage can be transmitted from the PWM controller to the comparison circuit in 2n steps via n control lines.
  • FIG. 1 shows a PWM blower regulator with a protective circuit which uses the peak current in the power semiconductor limit switch for comparison with a proportional reference voltage derived from the pulse width ratio of the PWM control signals
  • FIG. 2 shows a PWM blower regulator with a protective circuit which uses the drain peak voltage at the power semiconductor limit switch for comparison with a quasi-proportional (step-by-step) reference voltage derived from the pulse width ratio of the PWM control signals.
  • the PWM blower regulator is fed by a DC voltage which is connected to the connection of UBATT with the positive potential and to the connection GND with the negative potential. Is fed including a PWM control PWM-St which, depending on a predetermined or predefinable setpoint SOLL, outputs PWM control signals to a power semiconductor limit switch T1 at the output st.
  • the pulse width ratio of the PWM control signals can increase proportionally with the desired value TARGET.
  • the DC voltage is smoothed with a buffer capacitor C1, since the series circuit comprising the power semiconductor limit switch T 1 and a motor M for the fan is clocked via the PWM control signals.
  • a free-wheeling diode D1 is connected in parallel to the motor M and is permeable to the switch-off voltage of the motor M.
  • the source connection of the power semiconductor limit switch T1 - which is a MOS
  • FET-in-low-side circuit - leads via a measuring resistor R1 to the GND connection.
  • the voltage drop across this measuring resistor R1 is used via a resistor R2 to charge a capacitor C2, which charges up to a peak charging voltage corresponding to the peak current, which is supplied as a peak measuring voltage Ui to a connection of a comparison circuit V.
  • a reference voltage Urf is fed to the second connection of the comparison circuit V and is tapped at a capacitor C3.
  • the capacitor C3 is charged via a resistor R5 which, depending on the PWM control signal st, alternately via the resistor R3 and a transistor T2 with the potential of the connection GND or via this
  • Resistor R4 is connected to the potential of the connection UBATT.
  • the control of the transistor T2 takes over the PWM control signal st via a resistor R6.
  • the protective circuit is designed so that it can be connected to the one
  • Resistor R7 outputs an output signal p at the output connected to connection UBATT when the peak measuring voltage Ui exceeds the reference voltage Urf.
  • the design of the protective circuit can also be such that it emits an output signal p when the peak measuring voltage Ui falls below the reference voltage Urf.
  • Output signal p of the comparison circuit V can result in a reduction in the pulse width ratio of the PWM control signals st, the reduction ending until a stable, non-critical operating state is reached, i.e. the reduction can lead to the power stage being switched off.
  • a limited or permanent shutdown of the PWM control signals st can also be carried out with the output signal p of the comparison circuit V.
  • the PWM blower regulator according to FIG. 1 differs from the exemplary embodiment according to FIG. 1 in the protective circuit.
  • the drain-peak voltage Udr is used for comparison.
  • the voltage drop tapped at the drain-source path of the power semiconductor limit switch T1 is used via the resistor R8 to charge the capacitor C2.
  • the peak charging voltage corresponds to the peak drain voltage Udr.
  • a quasi-proportional signal is supplied to the comparison circuit V as the reference voltage.
  • the capacitor C3 at the input of the comparison circuit V is charged via the binary graduated resistors R3, R4, R5 and R6, the connection via the control lines rf1 to rfn in the PWM control PWM-St, depending on the pulse width ratio of the PWM control signals st.
  • n tax Lines rf1 to rfn generate a number of 2 ⁇ stages of a reference voltage Urf 1 to Urfn and transmit them to the comparison circuit V.
  • a diode D5 is connected as a latching circuit, which can continuously maintain the output signal p of the comparison circuit V.
  • the latch circuit can also be canceled via a reset connection rs of the PWM control PWM-St.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne un circuit de protection destiné à un montage en série constitué d'un commutateur de fin de course (T1) à semi-conducteur de puissance et d'un moteur (M) formant la charge inductive, dans lequel le commutateur de fin de course à semi-conducteur de puissance peut être fermé et ouvert par une commande à modulation d'impulsions en largeur émettant des signaux de commande à modulation d'impulsions en largeur. Une protection contre les surcharges dans des conditions de fonctionnement avec modulation d'impulsions en largeur est obtenue, selon l'invention, par le fait, qu'à partir du signal de commande à modulation d'impulsions en largeur peut être dérivée une tension de référence (UrF) proportionnelle ou quasi-proportionnelle au rapport des largeurs d'impulsions, tension de référence qui est comparée (V) avec une tension de mesure de pointe (Ui) correspondant à un courant de pointe traversant le commutateur de fin de course à semi-conducteur ou avec la tension de drain de pointe apparaissant au niveau du commutateur de fin de course à semi-conducteur de puissance, et par le fait que le rapport des largeurs d'impulsions diminue ou que la commande du commutateur de fin de course à semi-conducteur peut être coupée au moins pendant une période prédéterminée ou pouvant être prédéterminée, lorsque la tension de mesure de pointe ou la tension de drain de pointe est supérieure ou inférieure à la tension de référence dérivée des signaux de commande à modulation d'impulsions en largeur.
PCT/DE2000/002933 1999-09-01 2000-08-26 Circuit de protection pour un montage en serie constitue d'un commutateur de fin de course a semi-conducteur de puissance et d'un moteur WO2001017086A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19941488.2 1999-09-01
DE19941488A DE19941488A1 (de) 1999-09-01 1999-09-01 Schutzschaltung für eine Reihenschaltung aus Leistungshalbleiter-Endschalter und Motor

Publications (1)

Publication Number Publication Date
WO2001017086A1 true WO2001017086A1 (fr) 2001-03-08

Family

ID=7920313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/002933 WO2001017086A1 (fr) 1999-09-01 2000-08-26 Circuit de protection pour un montage en serie constitue d'un commutateur de fin de course a semi-conducteur de puissance et d'un moteur

Country Status (2)

Country Link
DE (1) DE19941488A1 (fr)
WO (1) WO2001017086A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107517A (zh) * 2013-03-01 2013-05-15 深圳市怡化电脑有限公司 直流电机的过载保护方法及系统

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123680A1 (de) * 2001-04-20 2002-11-21 Siemens Ag Verfahren zum Überlastschutz einer Endstufe eines Stellgliedes, insbesondere für einen Lageregler
DE10149390C1 (de) * 2001-09-28 2002-10-10 Stribel Gmbh Steuergerät
DE10242790A1 (de) 2002-09-14 2004-03-25 Robert Bosch Gmbh Verfahren zum Regeln des Stroms durch ein elektromagnetisches Stellglied
DE10313520A1 (de) * 2003-03-26 2004-10-14 Robert Bosch Gmbh Verfahren und Steuerschaltung zum Feststellen eines Betriebszustandes bei der Ansteuerung eines Lüftermotors
CN100574031C (zh) * 2007-04-06 2009-12-23 广州金升阳科技有限公司 一种电源变换器输出保护电路

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255067A1 (fr) * 1986-07-29 1988-02-03 Siemens Aktiengesellschaft Circuit limiteur de courant
EP0749189A1 (fr) * 1994-12-19 1996-12-18 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de prevention des surintensites d'alimentation
US5757214A (en) * 1995-07-19 1998-05-26 Stoddard; Robert J. PWM driver for an inductive load with detector of a not regulating PWM condition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0255067A1 (fr) * 1986-07-29 1988-02-03 Siemens Aktiengesellschaft Circuit limiteur de courant
EP0749189A1 (fr) * 1994-12-19 1996-12-18 Yamaha Hatsudoki Kabushiki Kaisha Dispositif de prevention des surintensites d'alimentation
US5757214A (en) * 1995-07-19 1998-05-26 Stoddard; Robert J. PWM driver for an inductive load with detector of a not regulating PWM condition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107517A (zh) * 2013-03-01 2013-05-15 深圳市怡化电脑有限公司 直流电机的过载保护方法及系统
CN103107517B (zh) * 2013-03-01 2015-05-20 深圳怡化电脑股份有限公司 直流电机的过载保护方法

Also Published As

Publication number Publication date
DE19941488A1 (de) 2001-03-15

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