WO2009033861A1 - Drive circuit - Google Patents

Drive circuit Download PDF

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Publication number
WO2009033861A1
WO2009033861A1 PCT/EP2008/059443 EP2008059443W WO2009033861A1 WO 2009033861 A1 WO2009033861 A1 WO 2009033861A1 EP 2008059443 W EP2008059443 W EP 2008059443W WO 2009033861 A1 WO2009033861 A1 WO 2009033861A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
integrated switch
integrated
arrangement according
circuit arrangement
Prior art date
Application number
PCT/EP2008/059443
Other languages
German (de)
French (fr)
Inventor
Christoph Wenger
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 WO2009033861A1 publication Critical patent/WO2009033861A1/en

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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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • 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
    • H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature

Definitions

  • the invention relates to a drive circuit, for example for driving lamps in motor vehicles with the features of claim 1.
  • the power loss of the drive circuit is limited depending on the PCB or controller temperature so that the allowable peak temperature is not exceeded.
  • This advantage is achieved by the switching frequency of the drive circuit is kept variable and is controlled or regulated in dependence on the temperature.
  • the control or regulation of the switching frequency is performed only above a predeterminable limit temperature.
  • the calculation and the generation of the switching frequency and the on and off ratio is advantageously carried out by means of a controller or by means of an integrated into an ASIC calculator.
  • a further advantageous embodiment of the invention uses an analog controller.
  • the printed circuit board temperature is a suitable
  • Temperature sensor used advantageously a voltage divider with an NTC resistor serves as a temperature sensor.
  • a lamp 10 or an LED with the aid of an integrated switch 11 is to be controlled.
  • the integrated switch 11 receives the voltage via KL 30 or a corresponding connection to a battery 12.
  • the control of the integrated switch 11 takes place by means of a microprocessor 13.
  • the microprocessor 13 is connected via a voltage divider with the resistor 14 and the NTC resistor 15 a Reference voltage supplied, which is reduced by the voltage drop across the resistor 14 to U_Ref.
  • the associated terminal, via which the reference voltage U_Ref is supplied, is also referred to as the reference voltage terminal.
  • the other side of the voltage divider 14, 15 is grounded.
  • the NTC resistor 15 and the integrated switch 11 are thermally coupled to one another, resulting in a particularly good thermal property of the overall system.
  • Essential to the invention is that initially the switching frequency with which the integrated switch 11 operates, is kept constant. At higher temperatures, the switching frequency is variable and is regulated as a function of the temperature. A control of the switching frequency is possible. In particular, in load scenarios that are outside the specified range, ie, for example, particularly high load requirements as well as extremely unfavorable tolerance of the components and loads can be significantly improved with minor functional impairment reliability.
  • the influencing of the switching frequency of the integrated switch 10 can take place both via a controller and via a control and is with the aid of
  • Microprocessor 13 realized.
  • the desired frequency range is in the range of 30 Hz to 200 Hz.
  • the switch is switched on constantly.
  • the resulting reduction in the life of the light bulb is accepted in favor of the lower temperature control unit.
  • the calculation and the generation of the switching frequency and the switch-on and switch-off ratio takes place in the controller 13.
  • the controller 13 Alternatively, also in an ASIC integrated calculator or an analog controller are possible.
  • the voltage divider with the NTC resistor whose output voltage is measured by means of the controller 13 or an analog-to-digital converter which is integrated into the latter and is not shown in the figure is used to measure the printed circuit board temperature.
  • other temperature sensors or the use of a temperature model based on him vehicle already existing input variables are possible. These input variables are, for example, the outside temperature, the water temperature, the battery temperature, the driving speed and / or the expected load profile.

Abstract

The invention describes a drive circuit for an integrated switch, in which the integrated switch can be driven with the aid of a microprocessor. The integrated switch is used for driving loads, for example lamps or LEDs, in particular in motor vehicles. The driving takes place in such a way that a constant frequency is used below a predeterminable temperature and a temperature-dependent frequency is used above said predeterminable temperature. In order to determine the temperature, an NTC thermistor is used, for example.

Description

Beschreibung description
Titel AnsteuerschaltungTitle control circuit
Stand der TechnikState of the art
Die Erfindung betrifft eine Ansteuerschaltung, beispielsweise zur Ansteuerung von Lampen in Kraftfahrzeugen mit den Merkmalen des Anspruchs 1.The invention relates to a drive circuit, for example for driving lamps in motor vehicles with the features of claim 1.
Zur Ansteuerung von Lampen werden heute im Kraftfahrzeug üblicherweise integrierter Halbleiterschalter eingesetzt. Neben anderen Vorteilen bieten diese auch die Möglichkeiten, bei höheren Betriebsspannungen, wie sie im Kraftfahrzeug auftreten können, durch zyklisches schnelles Ein- und Ausschalten den Effektivstrom und damit die Temperatur der Glühwendel der Lampe zu reduzieren und in einem zulässigen Bereich zu halten. Dadurch ergibt sich neben einer von der Betriebsspannung weitestgehend unabhängigen Leuchtstärke auch eine Vermeidung der verstärkten Alterung bei hohen Spannungen. Da die Schaltgeschwindigkeit der eingesetzten Schalter endlich ist, ergibt sich jedoch während des Schaltvorgangs eine nicht vernachlässigbare zusätzliche Verlustleistung. Diese kann je nach verwendeter Schaltfrequenz im Bereich derFor driving lamps today integrated semiconductor switches are usually used in the motor vehicle. Among other advantages, these also offer the possibilities, at higher operating voltages, such as those that can occur in the motor vehicle, to reduce the effective current and thus the temperature of the incandescent filament of the lamp by cyclically rapid switching on and off, and to keep it within a permissible range. This results in addition to a largely independent of the operating voltage luminous intensity also avoiding the increased aging at high voltages. Since the switching speed of the switch used is finite, however, results during the switching operation, a non-negligible additional power loss. This can vary depending on the switching frequency used in the
Leitverluste durch den Ohm'schen Anteil des Schalters liegen.Lead losses are due to the ohmic portion of the switch.
Offenbarung der ErfindungDisclosure of the invention
Die erfindungsgemäße Lösung mit den Merkmalen des Anspruchs 1 hat denThe solution according to the invention with the features of claim 1 has the
Vorteil, dass die Verlustleistung der Ansteuerschaltung abhängig von der Leiterplatten- bzw. Steuergerätetemperatur so begrenzt wird, dass die zulässige Spitzentemperatur nicht überschritten wird. Erzielt wird dieser Vorteil, indem die Schaltfrequenz der Ansteuerschaltung variabel gehalten wird und in Abhängigkeit von der Temperatur gesteuert oder geregelt wird. In einer vorteilhaften Ausgestaltung der Erfindung wird die Steuerung oder Regelung der Schaltfrequenz nur oberhalb einer vorgebbaren Grenztemperatur durchgeführt.Advantage that the power loss of the drive circuit is limited depending on the PCB or controller temperature so that the allowable peak temperature is not exceeded. This advantage is achieved by the switching frequency of the drive circuit is kept variable and is controlled or regulated in dependence on the temperature. In an advantageous embodiment of the invention, the control or regulation of the switching frequency is performed only above a predeterminable limit temperature.
Die Berechnung und die Erzeugung der Schaltfrequenz und das Ein- und Ausschaltverhältnis erfolgt in vorteilhafter Weise mittels eines Controllers oder mittels eines in ein ASIC integrierten Rechenwerks. Eine weitere vorteilhafte Ausgestaltung der Erfindung verwendet einen analogen Regler. Zur Messung der Temperatur, insbesondere der Leiterplattentemperatur wird ein geeigneterThe calculation and the generation of the switching frequency and the on and off ratio is advantageously carried out by means of a controller or by means of an integrated into an ASIC calculator. A further advantageous embodiment of the invention uses an analog controller. For measuring the temperature, in particular the printed circuit board temperature is a suitable
Temperatursensor eingesetzt, in vorteilhafter Weise dient ein Spannungsteiler mit einem NTC-Widerstand als Temperatursensor.Temperature sensor used, advantageously a voltage divider with an NTC resistor serves as a temperature sensor.
Zeichnungdrawing
Ein Ausführungsbeispiel der Erfindung ist in der Figur dargestellt und wird in der zugehörigen Beschreibung näher erläutert.An embodiment of the invention is illustrated in the figure and is explained in more detail in the accompanying description.
In der Figur ist ein Ausführungsbeispiel dargestellt, bei dem eine Lampe 10 bzw. eine LED mit Hilfe eines integrierten Schalters 11 angesteuert werden soll. Der integrierte Schalter 11 erhält die Spannung über KL 30 oder eine entsprechende Verbindung zu einer Batterie 12. Die Ansteuerung des integrierten Schalters 11 erfolgt mit Hilfe eines Mikroprozessors 13. Dem Mikroprozessor 13 wird über einen Spannungsteiler mit dem Widerstand 14 und dem NTC-Widerstand 15 eine Referenzspannung zugeführt, die um den Spannungsabfall im Widerstand 14 gegenüber U_Ref verringert ist. Der zugehörige Anschluss, über den die Referenzspannung U_Ref zugeführt wird, wird auch las Referenzspannungsanschluss bezeichnet. Die andere Seite des Spannungsteilers 14, 15 liegt auf Masse.In the figure, an embodiment is shown, in which a lamp 10 or an LED with the aid of an integrated switch 11 is to be controlled. The integrated switch 11 receives the voltage via KL 30 or a corresponding connection to a battery 12. The control of the integrated switch 11 takes place by means of a microprocessor 13. The microprocessor 13 is connected via a voltage divider with the resistor 14 and the NTC resistor 15 a Reference voltage supplied, which is reduced by the voltage drop across the resistor 14 to U_Ref. The associated terminal, via which the reference voltage U_Ref is supplied, is also referred to as the reference voltage terminal. The other side of the voltage divider 14, 15 is grounded.
Der NTC-Widerstand 15 sowie der integrierter Schalter 11 sind miteinander thermisch gekoppelt, wodurch sich eine besonders gute thermische Eigenschaft des Gesamtsystems ergibt. Erfindungswesentlich ist, dass zunächst die Schaltfrequenz mit der der integrierte Schalter 11 arbeitet, konstant gehalten wird. Bei höherer Temperatur ist die Schaltfrequenz variabel und wird in Abhängigkeit von der Temperatur geregelt. Auch eine Steuerung der Schaltfrequenz ist möglich. Insbesondere bei Lastszenarien, die außerhalb des spezifizierten Bereichs liegen, also beispielsweise bei besonders hohen Lastanforderungen sowie auch bei extrem ungünstiger Toleranzlage der Bauelemente und Lasten kann bei geringfügiger Funktionseinschränkung die Betriebssicherheit deutlich verbessert werden. Die Beeinflussung der Schaltfrequenz des integrierten Schalters 10 kann sowohl über eine Steuerung als auch über eine Regelung erfolgen und wird mit Hilfe desThe NTC resistor 15 and the integrated switch 11 are thermally coupled to one another, resulting in a particularly good thermal property of the overall system. Essential to the invention is that initially the switching frequency with which the integrated switch 11 operates, is kept constant. At higher temperatures, the switching frequency is variable and is regulated as a function of the temperature. A control of the switching frequency is possible. In particular, in load scenarios that are outside the specified range, ie, for example, particularly high load requirements as well as extremely unfavorable tolerance of the components and loads can be significantly improved with minor functional impairment reliability. The influencing of the switching frequency of the integrated switch 10 can take place both via a controller and via a control and is with the aid of
Mikroprozessors 13 realisiert. Der angestrebte Frequenzbereich liegt im Bereich von 30 Hz bis 200 Hz. Das dadurch bei Lampen, insbesondere bei LEDs resultierende Flackern wird zugelassen.Microprocessor 13 realized. The desired frequency range is in the range of 30 Hz to 200 Hz. The resulting flickering in lamps, especially LEDs, is permitted.
Falls die erzielte Leistungsreduktion nicht ausreicht, wird der Schalter konstant eingeschaltet. Die dabei entstehende Reduktion der Lebensdauer der Glühlampe wird zugunsten der niedrigeren Steuergerätetemperatur in Kauf genommen. Die Berechnung und die Erzeugung der Schaltfrequenz und das Ein- und Ausschaltverhältnis erfolgt im Controller 13. Alternativ sind auch in ein ASIC integriertes Rechenwerk oder auch ein analoger Regler möglich.If the achieved power reduction is insufficient, the switch is switched on constantly. The resulting reduction in the life of the light bulb is accepted in favor of the lower temperature control unit. The calculation and the generation of the switching frequency and the switch-on and switch-off ratio takes place in the controller 13. Alternatively, also in an ASIC integrated calculator or an analog controller are possible.
Zur Messung der Leiterplattentemperatur dient der Spannungsteiler mit dem NTC-Widerstand, dessen Ausgangsspannung über den Controller 13 bzw. einen in diesen integrierten und in der Figur nicht dargestellten Analog-Digital- Umsetzer gemessen wird. Alternativ sind auch andere Temperatursensoren oder auch der Einsatz eines Temperaturmodells auf Basis von ihm Fahrzeug bereits vorhandener Eingangsgrößen möglich. Diese Eingangsgrößen sind beispielsweise die Außentemperatur, die Wassertemperatur, die Batterietemperatur, die Fahrgeschwindigkeit und/oder das zu erwartende Lastprofil. The voltage divider with the NTC resistor whose output voltage is measured by means of the controller 13 or an analog-to-digital converter which is integrated into the latter and is not shown in the figure is used to measure the printed circuit board temperature. Alternatively, other temperature sensors or the use of a temperature model based on him vehicle already existing input variables are possible. These input variables are, for example, the outside temperature, the water temperature, the battery temperature, the driving speed and / or the expected load profile.

Claims

Ansprüche claims
1. Ansteuerschaltung zur Versorgung vorgebbarer Verbraucher mit einem integrierten Schalter (11), über den der Verbraucher (10) mit einer Spannungsquelle (13) verbindbar ist und mit einem Prozessor, der den integrierten Schalter (11) ansteuert, dadurch gekennzeichnet, dass dem integrierten Schalter (11) vom Mikrocontroller (13) erzeugte Ansteuersignale zugeführt werden, die den integrierten Schalter (11) abhängig von einer vorgebbaren Temperatur öffnen und schließen.Anspruch [en] A drive circuit for supplying predefinable loads with an integrated switch (11) via which the load (10) can be connected to a voltage source (13) and which has a processor that controls the integrated switch (11), characterized in that the integrated Switches (11) supplied by the microcontroller (13) driving signals are supplied to open and close the integrated switch (11) depending on a predetermined temperature.
2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Temperatur mit Hilfe eines NTC-Widerstandes (15) gemessen wird.2. Circuit arrangement according to claim 1, characterized in that the temperature with the aid of an NTC resistor (15) is measured.
3. Schaltungsanordnung nach Anspruch 2, dadurch gekennzeichnet, dass der NTC-Widerstand Bestandteil eines Spannungsteilers (14, 15) ist, der zwischen einem Referenzspannungsanschluss und Masse liegt.3. A circuit arrangement according to claim 2, characterized in that the NTC resistor is part of a voltage divider (14, 15) which lies between a reference voltage terminal and ground.
4. Schaltungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der NTC-Widerstand (15) und der integrierte Schalter (11) miteinander thermisch gekoppelt sind.4. Circuit arrangement according to one of the preceding claims, characterized in that the NTC resistor (15) and the integrated switch (11) are thermally coupled together.
5. Schaltungsanordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der schaltbare Verbraucher (10) eine Lampe oder eine LED ist. 5. Circuit arrangement according to one of the preceding claims, characterized in that the switchable load (10) is a lamp or an LED.
PCT/EP2008/059443 2007-09-10 2008-07-18 Drive circuit WO2009033861A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007043076A DE102007043076A1 (en) 2007-09-10 2007-09-10 drive circuit
DE102007043076.2 2007-09-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT14190U1 (en) * 2013-11-12 2015-05-15 Tridonic Gmbh & Co Kg Operating device and method for operating at least one light-emitting diode

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
US6060834A (en) * 1998-09-30 2000-05-09 Honda Giken Kogyo Kabushiki Kaisha Protection from overheating of a switching transistor that delivers current to a daytime running light on a vehicle
DE19930174A1 (en) * 1999-06-30 2001-01-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Control circuit for LED and associated operating method
US6366153B1 (en) * 2000-05-09 2002-04-02 Delphi Technologies, Inc. Thermal management of an electronic switch
US6426569B1 (en) * 2000-07-13 2002-07-30 Yazaki North America Adaptive variable frequency PWM lamp-using system
EP1349433A2 (en) * 2002-03-30 2003-10-01 Hella KG Hueck & Co. Controlling device for controlling electric light sources and headlamp with such a controlling device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5783909A (en) * 1997-01-10 1998-07-21 Relume Corporation Maintaining LED luminous intensity
US6060834A (en) * 1998-09-30 2000-05-09 Honda Giken Kogyo Kabushiki Kaisha Protection from overheating of a switching transistor that delivers current to a daytime running light on a vehicle
DE19930174A1 (en) * 1999-06-30 2001-01-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Control circuit for LED and associated operating method
US6366153B1 (en) * 2000-05-09 2002-04-02 Delphi Technologies, Inc. Thermal management of an electronic switch
US6426569B1 (en) * 2000-07-13 2002-07-30 Yazaki North America Adaptive variable frequency PWM lamp-using system
EP1349433A2 (en) * 2002-03-30 2003-10-01 Hella KG Hueck & Co. Controlling device for controlling electric light sources and headlamp with such a controlling device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT14190U1 (en) * 2013-11-12 2015-05-15 Tridonic Gmbh & Co Kg Operating device and method for operating at least one light-emitting diode

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Publication number Publication date
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