WO2000031603A1 - Circuit pour produire une tension d'alimentation stabilisee destinee a plusieurs consommateurs - Google Patents

Circuit pour produire une tension d'alimentation stabilisee destinee a plusieurs consommateurs Download PDF

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Publication number
WO2000031603A1
WO2000031603A1 PCT/DE1999/003516 DE9903516W WO0031603A1 WO 2000031603 A1 WO2000031603 A1 WO 2000031603A1 DE 9903516 W DE9903516 W DE 9903516W WO 0031603 A1 WO0031603 A1 WO 0031603A1
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WO
WIPO (PCT)
Prior art keywords
voltage
circuit arrangement
input
output
arrangement according
Prior art date
Application number
PCT/DE1999/003516
Other languages
German (de)
English (en)
Inventor
Michael Lenz
Frank-Lothar Schwertlein
Heinrich Gschloessl
Original Assignee
Infineon Technologies 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 Infineon Technologies Ag filed Critical Infineon Technologies Ag
Publication of WO2000031603A1 publication Critical patent/WO2000031603A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/577—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices for plural loads

Definitions

  • Circuit arrangement for generating a stabilized supply voltage for several consumers
  • the invention relates to a circuit arrangement for generating a stabilized supply voltage for several consumers with a voltage regulator, which converts a first voltage at its input into a second voltage and makes it available at its output.
  • Electronic control units are used to supply various components, e.g. a microcontroller, sensors for detecting certain operating states or actuators for setting desired setpoints, stabilized voltages are required.
  • the generation of a constant and stabilized voltage is implemented, for example, by analog voltage regulators or clocked switching regulators.
  • Various embodiments of linear voltage regulators are described, for example, in Tietze, Schenk, Semiconductor Circuit Technology, 10th Edition, Springer-Verlag, 1993, pages 542 to 555. Due to the ever increasing number of electrical consumers in electronic systems and the increasing complexity of the electronic controls, the power loss occurring in a voltage regulator rises sharply due to the ever increasing current. This power loss requires complex cooling measures.
  • FIG. 1 shows a basic circuit arrangement with a voltage regulator, which supplies several consumers with a constant voltage, as is known from the prior art.
  • the circuit arrangement has a control unit 10, on which a voltage regulator 3, a microprocessor 7, and two drivers 8, each of which controls a consumer 4, 5 located outside the control unit 10.
  • the consumer 4 is shown by way of example as an actuator; this can be a servomotor, for example.
  • the sensor 5 detects, for example, the temperature or speed of an electric motor.
  • the control unit 10 has a first supply potential connection 1, which forms the input of the voltage regulator 3.
  • the positive supply voltage Vbb is present at this. If the circuit arrangement were used in a motor vehicle, this would be 12 V, for example.
  • the voltage regulator 3 also has a reference potential connection 9, which advantageously represents the ground potential.
  • voltage regulator 3 supplies a constant output voltage Vref, which is 5 V, for example.
  • the voltage Vref present at the output 2 represents the supply voltage for the microcontroller 7 and the consumers 4, 5.
  • the control unit could be used in the automotive sector and could represent an electronic control unit (ECU) that monitors and controls various sensors or actuators in the car.
  • ECU electronice control unit
  • An application would be conceivable, for example, in an ABS or an airbag control.
  • the voltage regulator 3 This is determined from the voltage drop between output 2 and input 1 of voltage regulator 3 and the current flowing depending on the number of consumers. As already mentioned, the power loss due to the voltage regulator necessitates cooling measures.
  • a disadvantage of the known circuit arrangement is that the function of the entire circuit arrangement can be impaired in the event of a short circuit on one of the supply lines 20. If the reference potential is present on one of the supply lines 20 due to a fault, this inevitably leads to the destruction of the controller 7, which carries out the control of all consumers. If the microcontroller 7 fails, the entire circuit arrangement fails. Voltage regulators, however, are usually designed to be short-circuit proof. Likewise, the circuit arrangement can be impaired if an overload can occur due to a fault in the consumer.
  • the object of the present invention is therefore to provide a circuit arrangement for generating stabilized voltage for a plurality of consumers, which can provide each consumer with exactly the same reference voltage. Furthermore, the power loss occurring during operation can be dissipated or distributed in a simple manner. This object is achieved with the features of patent claim 1.
  • the voltage present at the output of the voltage regulator is fed to at least one impedance converter at its control input, the output of the impedance converter being connected to exactly one consumer each and the voltage present at the output of the voltage regulator being present at the control input of the impedance converter. corresponds to the tension.
  • the voltage generated by the voltage regulator can be "passed on” to other consumers decoupled. Consequently, only an expensive voltage regulator is required, while the reference voltage is provided by the impedance converters, which are connected between the output of the voltage regulator and the supply potential connection of the respective consumer.
  • the supply voltage input of the impedance converter is connected to the input of the voltage regulator. This means nothing other than that the positive supply voltage is present at the supply voltage input of the impedance converter.
  • the output of the impedance converter is connected to the supply voltage input via the load path of a power transistor.
  • a driver circuit controls the power transistor so that the control input applied voltage at the output of the impedance converter is available.
  • the advantage of this circuit arrangement is that the current is conducted past the voltage regulator, so that the power loss is generated in the impedance converter.
  • the power transistor is advantageously a PNP transistor.
  • Another advantage is the high precision of the reference voltage made available to the consumers. The risk of a malfunction of the circuit arrangement due to a short circuit or overcurrent is further reduced.
  • a differential amplifier is advantageously provided in the impedance converter of the circuit arrangement according to the invention, the negative input of which is connected to the connection point of the collector of the power transistor to the output of the impedance converter.
  • the positive input of the differential amplifier is connected to the control input of the impedance converter, the output of the differential amplifier controlling a transistor which regulates the voltage drop across the load path of the power transistor.
  • the collector-emitter path of this transistor is located between the base of the power transistor and a reference potential connection.
  • a further transistor is provided, the base connection of which is connected to the control input of the impedance converter and the collector-emitter path is connected in series with a current source between the supply voltage input and the reference potential connection.
  • the connection point between the current source and the emitter of a further transistor is connected to an operating potential connection of the differential amplifier.
  • a saturation control for the power transistor is advantageously provided, which reduces the reverse current in the case of an inverse operation and controls the base current in the drop mode.
  • Inverse operation can occur, for example, due to a short-circuit in the supply voltage, with a brief interruption of the supply voltage, or with reverse polarity.
  • the reverse current is prevented by the bipolar power transistor, which, in contrast to a MOSFET, does not have an integrated, anti-parallel diode.
  • the backflow is also limited by the saturation control. This is described, for example, in EP 0 374 288 B1.
  • the control of the base current in drop mode leads to an optimized power control of the power transistor.
  • the base current is regulated against the reference potential, advantageously the ground potential.
  • the impedance converter is advantageously designed in a monolithically integrated form. As a separate component, it can be placed in a circuit arrangement in a simple manner at the desired locations.
  • the voltage present at the control input of the impedance converter is controlled via a microcontroller.
  • the voltage specified by the microcontroller can change between the second voltage, that is to say the voltage present at the output of the main voltage regulator, and a reference potential.
  • the control input of the impedance converter is alternately acted upon by the voltage present at the output of the main voltage converter and by a voltage value below a threshold value which puts the impedance converter into the sleep mode. It is thus possible, for example, to read out information from a sensor only at certain times, that is to say to only supply the sensor with a voltage while it is in the rest mode in the rest of the time. This enables a very effective power saving mode. It is also possible, as already mentioned, to use the impedance converter as a high-side switch, which switches the voltage present at the supply voltage input of the impedance converter.
  • the circuit arrangement according to the invention is advantageously used in an electrical control unit in the motor vehicle sector.
  • FIG. 1 shows a basic circuit arrangement known from the prior art with a voltage regulator
  • FIG. 2 shows the basic structure of the circuit arrangement according to the invention, which has a number of impedance converters corresponding to the number of consumers,
  • FIG. 3 shows the circuit implementation of the impedance converter described in FIG. 2 and Figure 4 shows another embodiment of the circuit arrangement according to the invention and
  • FIG. 2 shows a circuit arrangement that could be used as a control unit in a motor vehicle, for example.
  • the control unit 10 differs from the control unit shown in FIG. 1 mainly in that, in addition to a voltage regulator 3, a microcontroller 7, drivers 8 and consumers 4, 5, it has an impedance converter 6, each between the supply voltage connection of the consumers 4, 5 and the output 2 of the voltage regulator 3 are switched.
  • FIG. 2 shows two consumers 4, 5, each of which is assigned an impedance converter 6.
  • An impedance converter 6 each has a supply voltage input IN, which is connected to the first supply potential connection 1, to which a positive supply voltage Vbb is present.
  • a control input ADJ is connected to output 2 of the voltage regulator, to which a reference voltage Vref is present.
  • the reference voltage is generally less than the supply potential Vbb and is predetermined by the output of the voltage regulator 3.
  • An output Q which is regulated in such a way that the same voltage is applied to it as at the control input ADJ, is connected to the consumer 4 or 5 and serves this as a supply potential connection.
  • Each of the impedance converters is connected to a reference potential connection 9, as is the voltage regulator 3.
  • the reference potential connections 9 can be connected to one another internally.
  • the advantage of this circuit arrangement is that the power loss is no longer generated at the voltage regulator 3, but at the impedance converters 6.
  • the current required by the consumer is conducted around the voltage regulator 3.
  • the power loss caused by the voltage regulator 3 is now only due to the current it needs and the falling voltage.
  • the impedance converters 6 are advantageously designed as individual, packaged semiconductor components. elements, therefore the power loss can be spatially distributed.
  • Another advantage is the increased reliability of the entire circuit arrangement. If a short circuit or overcurrent occurs on the supply line 20, which is, for example, outside the control unit 10, the consumer 4, 5 can be damaged as a result, but the entire circuit arrangement is not impaired.
  • the impedance converter 6 is advantageously designed for current and overvoltage, so that this damage is prevented by this control unit 10. A decoupling of the various outputs to the consumers from the control unit is thus achieved.
  • Another advantage of the circuit arrangement according to the invention is that only a precise voltage regulator is required, which is generally expensive and complex to manufacture. This is the voltage regulator 3 in FIG. 2.
  • the impedance converters 6 use the precision and accuracy of the voltage regulator 3 and precisely regulate this predetermined reference voltage. Accordingly, every consumer receives the same reference voltage. The use of several voltage regulators, which could lead to problems in the entire circuit arrangement due to the different reference voltages, is thus avoided.
  • the circuit arrangement according to the invention is also significantly cheaper.
  • FIG. 3 shows the circuit implementation of the impedance converter described in Figure 2.
  • the supply potential of the entire circuit arrangement for example the control unit, is present at the supply voltage input IN.
  • the supply voltage input IN is over the
  • the PNP transistor 11 is a so-called
  • the drop voltage that is to say the voltage dropping minimally across the PNP transistor between the emitter and the collector, is kept as small as possible in order to enable the precision of the impedance converter to be achieved even with a slightly higher supply voltage Vbb than the voltage present at the control input ADJ 6 is not affected. This is particularly important in the automotive sector, where, for example, a sharp drop in the supply voltage of 12 V can be observed during the starting process. With a small drop voltage, however, the voltage present at output Q, which is identical to the voltage present at control input ADJ, remains at a stable value.
  • the differential amplifier works in its common mode range. This means that the control loop remains closed.
  • a saturation regulator 16 is provided which reduces a reverse current in the event of a possible inverse operation of the impedance converter.
  • the control loop of the impedance converter 6 at output Q is compensated for ground by a capacitor that has a small ⁇ F capacitance. If the supply voltage at the supply voltage input IN breaks down during operation, the voltage results a significantly higher value at output Q than for the supply voltage, since voltage is still present at the capacitive load. For example, in the event of a short circuit at the supply voltage input IN - caused, for example, by switching off the voltage supply at which other consumers are connected - the voltage at the supply voltage input IN goes to zero, while at its output Q the voltage is initially maintained by the smoothing compensator.
  • the impedance converter according to FIG. 3 has a further bipolar transistor 14 which is connected with its base connection to the control input ADJ.
  • the collector of the further transistor 14 is connected to the reference potential connection 9 in
  • the connection point between the current source 15 and the emitter of the transistor 14 is connected to an operating potential connection of the differential amplifier 12.
  • control input ADJ is therefore expediently supplied with a voltage by a microcontroller. It is also possible to use the impedance converter shown in FIG. 3 as a high-side switch. For this purpose, the control input ADJ is switched to the potential at the supply voltage input IN or above. The differential amplifier is then in large-signal operation and therefore fully controls the power transistor 11. The saturation control then takes on the task of optimally controlling the base current of the power transistor 11, so that the lowest possible voltage drops from the collector-emitter path when the base current is optimized.
  • An impedance converter used as a high-side switch has short on / off times. Furthermore, it requires only a small amount of current in sleep mode.
  • the control as to whether the impedance converter is used as a controller or switch is selected by the voltage at the control input ADJ.
  • FIG. 4 shows a further exemplary embodiment of the circuit arrangement according to the invention.
  • the impedance converter 6 is constructed as described in FIG. 3.
  • the supply voltage Vbb present at the first supply potential connection 1 is regulated down to a reference voltage Vref via a voltage regulator 3 at the output 2 of the voltage regulator.
  • This is fed to a microcontroller 7, which can generate a digital signal at the output 21 of the microcontroller 7 via two transistors 17 and 18 connected in series with its load path.
  • either the reference voltage Vref can be applied to the control input ADJ, so that exactly this voltage is corrected at the output Q of the impedance converter 6.
  • the reference potential can be applied to the control input ADJ, so that the impedance converter is switched to the sleep mode.
  • the output Q of the impedance converter 6 and the voltage regulator 2 are connected to compensation capacitors 22 and 23.
  • the transistors 17 and 18 are of the opposite conduction type and are made of one in a known manner Driver 19 in the microcontroller 7 controlled.
  • the two transistors 17 and 18 form an inverter.
  • the controller 7 can of course have a large number of inverter stages, so that a large number of impedance converters 6 can also be controlled.
  • the number of impedance converters depends on the use of the entire circuit arrangement.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

L'invention concerne un circuit pour produire une tension d'alimentation stabilisée destinée à plusieurs consommateurs, ledit circuit présentant un régulateur de tension qui convertit une première tension, au niveau de son entrée, en une deuxième tension, mise ensuite à disposition au niveau de sa sortie. Cette tension est acheminée à l'entrée de commande d'au moins un transformateur d'impédance raccordé respectivement, par sa sortie, à exactement un consommateur. La tension appliquée à la sortie correspond à la tension appliquée à l'entrée de commande. Il est ainsi possible d'acheminer la même tension de référence à une pluralité de consommateurs. Ce circuit est en outre protégé contre des interférences éventuelles.
PCT/DE1999/003516 1998-11-19 1999-11-03 Circuit pour produire une tension d'alimentation stabilisee destinee a plusieurs consommateurs WO2000031603A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853478.7 1998-11-19
DE19853478 1998-11-19

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WO2000031603A1 true WO2000031603A1 (fr) 2000-06-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10223740B4 (de) * 2001-11-07 2006-04-27 Mitsubishi Denki K.K. Im Fahrzeug befindliche elektronische Steuervorrichtung
KR100810453B1 (ko) * 2000-07-28 2008-03-07 젠타리스 게엠베하 신규한 인돌 유도체 및 이를 포함하는 약제

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191740A2 (fr) * 1985-01-30 1986-08-20 Telefonaktiebolaget L M Ericsson Protection en température et en courant d'un régulateur de tension quadruple
DE3931893A1 (de) * 1988-12-01 1990-06-07 Nagema Veb K Schaltung zur strombegrenzung mit foldback-verhalten
EP0476440A2 (fr) * 1990-09-18 1992-03-25 National Semiconductor Corporation Organe de sortie d'interrupteur-séparateur protégé aux transitoires
EP0805540A1 (fr) * 1996-05-03 1997-11-05 MAGNETI MARELLI S.p.A. Un système d'alimentation pour une pluralité de dispositifs ou unités électroniques à bord d'un véhicule moteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191740A2 (fr) * 1985-01-30 1986-08-20 Telefonaktiebolaget L M Ericsson Protection en température et en courant d'un régulateur de tension quadruple
DE3931893A1 (de) * 1988-12-01 1990-06-07 Nagema Veb K Schaltung zur strombegrenzung mit foldback-verhalten
EP0476440A2 (fr) * 1990-09-18 1992-03-25 National Semiconductor Corporation Organe de sortie d'interrupteur-séparateur protégé aux transitoires
EP0805540A1 (fr) * 1996-05-03 1997-11-05 MAGNETI MARELLI S.p.A. Un système d'alimentation pour une pluralité de dispositifs ou unités électroniques à bord d'un véhicule moteur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100810453B1 (ko) * 2000-07-28 2008-03-07 젠타리스 게엠베하 신규한 인돌 유도체 및 이를 포함하는 약제
DE10223740B4 (de) * 2001-11-07 2006-04-27 Mitsubishi Denki K.K. Im Fahrzeug befindliche elektronische Steuervorrichtung

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