EP0421516A2 - Power supply arrangement with voltage regulation and current limiting - Google Patents

Power supply arrangement with voltage regulation and current limiting Download PDF

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Publication number
EP0421516A2
EP0421516A2 EP90202535A EP90202535A EP0421516A2 EP 0421516 A2 EP0421516 A2 EP 0421516A2 EP 90202535 A EP90202535 A EP 90202535A EP 90202535 A EP90202535 A EP 90202535A EP 0421516 A2 EP0421516 A2 EP 0421516A2
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EP
European Patent Office
Prior art keywords
voltage
control
resistor
transistor
power supply
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Granted
Application number
EP90202535A
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German (de)
French (fr)
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EP0421516A3 (en
EP0421516B1 (en
Inventor
Thomas Dipl.-Ing Riedger
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Nokia of America Corp
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Publication of EP0421516A3 publication Critical patent/EP0421516A3/en
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    • 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
    • G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S323/00—Electricity: power supply or regulation systems
    • Y10S323/908—Inrush current limiters

Definitions

  • the invention relates to a power supply device with a power transistor controlled by a control transistor, the switching path of which lies in each case between a pole of an unregulated DC input voltage and a regulated supply voltage, with a current measuring resistor, with a first control amplifier which drives the control transistor via a first electrode and which has a derivable from the supply voltage Comparing voltage with a first reference voltage, and with a second control amplifier, which compares a measuring voltage that can be tapped at the current measuring resistor with a second reference voltage.
  • DC voltages are required at which a desired voltage value is maintained within a certain tolerance range, even in the event of mains voltage fluctuations, load current fluctuations and temperature fluctuations.
  • a DC voltage obtained, for example, from the mains voltage by rectification is not directly suitable as an operating voltage for electronic circuits, but must be stabilized and smoothed by a downstream voltage regulation and current limitation.
  • a power supply device of the type mentioned is known from US-PS 4,346,342.
  • the voltage control is formed from a first control amplifier, which has a voltage at the inverting input, obtained at the tap of an output-side voltage divider, with a voltage at the non-inverting input compares the reference voltage.
  • the output of the first control amplifier is connected to the base of the control transistor.
  • the current limitation is formed by a second control amplifier, which compares a measuring voltage that can be tapped at the current measuring resistor with a second reference voltage.
  • the output of the second control amplifier is also connected to the base of the control transistor via a diode, while the emitter of the control transistor is connected to a reference potential via a resistor.
  • the base of the control transistor is thus driven both by the first control amplifier for voltage regulation and by the second control amplifier for current limitation.
  • the reference voltages of the two control amplifiers are generated from two separate reference voltages.
  • the invention is based on the object of specifying a power supply device of the type mentioned at the outset which has a low outlay on components and an adequate dynamic control behavior.
  • the first electrode is in particular the base and the second electrode is the emitter of the control transistor and the control transistor operates in the emitter circuit with active voltage regulation and in the base circuit with active current limitation.
  • the first control amplifier for voltage regulation is then active in normal operation. over If the measuring voltage across the current measuring resistor rises to the limit value specified by the second reference voltage and its output voltage rises, the control transistor is operated in the basic circuit and the load current of the control transistor drops to the extent that the measuring voltage rises.
  • a resistor between the output of the second control amplifier and the emitter of the control transistor.
  • a current negative feedback is achieved with the help of the resistor, so that in particular the temperature and current dependency of the gain of the control transistor and the dependency due to sample scatter is reduced.
  • the inverting input of the second control amplifier is connected to the pole of the regulated supply voltage via a resistor. This results in a declining characteristic of the regulated supply voltage as a function of the output current.
  • the first and the second reference voltage are obtained from a single reference voltage source.
  • This is designed, for example, as a zener diode or as a bandgap reference element.
  • the first reference voltage is obtained directly from the reference voltage source, while the second reference voltage is obtained from the reference voltage source, for example with the aid of a voltage divider can be won. Obtaining the two reference voltages from a single reference voltage source leads to further component savings.
  • a rectifier diode is located antiparallel to the base-emitter path of the control transistor. This limits the voltage on the base-emitter path and thus prevents a possible breakdown that occurs when switching from voltage control to current limitation, i.e. can occur during the transition of the operating state of the control transistor from the emitter circuit to the base circuit.
  • the first control amplifier is fed back through the series connection of a resistor and a capacitor. This enables a frequency response correction of the first control amplifier.
  • the second control amplifier is fed back through the series connection of a resistor and a capacitor. This makes it possible to correct the frequency response of the second control amplifier independently of that of the first control amplifier.
  • the figure shows a power supply device with voltage regulation and current limitation.
  • the voltage regulation and current limitation lie between a power supply device 1, which supplies an unregulated direct voltage UE (input voltage) and one Load resistor RL through which an output current I flows and to which a regulated supply voltage UA (output voltage) is present.
  • a first series branch ZW1 there is a PNP power transistor T1, the base-emitter path of which is connected via a resistor R4.
  • the power transistor T1 is driven by a control transistor T2.
  • the collector of the control transistor T2 is connected to the base of the power transistor T1.
  • a capacitor C3 and the series connection of a first resistor R1 and a second resistor R2 are connected in parallel with the load resistor RL.
  • the center tap of the resistors R1, R2 is connected to the inverting input of a first control amplifier OP1.
  • a reference voltage source Uref is located between the non-inverting input of the first control amplifier OP1 and the negative reference potential UA- of the output voltage UA.
  • the pole of the reference voltage source Uref connected to the non-inverting input of the first control amplifier OP1 is connected via a resistor R6 to the inverting input of a second control amplifier OP2.
  • the inverting input of the second control amplifier OP2 is also connected via a resistor R7 to the positive pole UA + of the output voltage UA.
  • a current measuring resistor R10 In a second series branch ZW2, between the negative pole UE- of the unregulated input voltage UE and the negative pole UA- of the regulated output voltage UA, there is a current measuring resistor R10, to which a measuring voltage UM is applied.
  • the connection of the current measuring resistor R10 connected to the negative pole UA- of the output voltage UA is connected to the non-inverting input of the second control amplifier OP2 and the connection connected to the negative pole UE- of the unregulated direct voltage UE is connected via a resistor R8 to the inverting input of the second control amplifier OP2 connected.
  • the control amplifier OP1 and the output of the first control amplifier OP1 connected to the base of the control transistor T2 are connected in series with a resistor R3 and a capacitor C1.
  • the series connection of a resistor R9 and a capacitor C2 lies between the inverting input of the second control amplifier OP2 and the output of the second control amplifier OP2.
  • the output of the second control amplifier OP2 is connected via a resistor R5 to the emitter of the control transistor T2.
  • a rectifier diode D1 is arranged antiparallel to the base-emitter path of the control transistor T2.
  • the two control amplifiers OP1, OP2 have a common voltage supply with a positive connection VCC and a negative connection VEE.
  • the voltage required for this is tapped directly from the direct voltage UE.
  • the positive connection VCC is connected to the positive pole UE + and the negative connection VEE is connected to the negative pole UE- of the unregulated direct voltage UE.
  • their supply voltage can also be obtained via a simple stabilization circuit.
  • the first control amplifier OP1 In normal operation, the first control amplifier OP1 is active for voltage regulation. In this operating state, the output current I is not limited by the second control amplifier OP2. The output of the second control amplifier OP2 is at the potential VEE. Thus, the connection of the resistor R5 connected to the emitter of the control transistor T2 is at the potential VEE and the control transistor T2 operates in an emitter circuit with current feedback.
  • the collector current of the control transistor T2 and thus also the base current of the power transistor T1 is proportional to the base voltage of the control transistor T2 as a result of the negative current feedback of the control transistor T2 through the resistor R5.
  • the output current I and thus also the collector current of the power transistor T1 is in turn proportional to the base current of the power transistor T1.
  • the output current I is regulated as a function of the instantaneous value of the load resistor RL so that the supply voltage UA at the load resistor RL remains constant.
  • the output voltage of the first control amplifier OP1 and thus the voltage at the base of the control transistor T2 are such that the voltage present at the inverting input of the first control amplifier OP1, which is formed by division via the voltage divider R1, R2, is equal to that at the non-inverting one Input reference voltage Uref.
  • the current feedback of the control transistor T2 through the emitter resistor R5 has the advantage that the gain of the control transistor T2 remains largely stable and is essentially determined by the resistance value of the emitter resistor R5 and is less dependent on the non-linear transmission characteristic of the control transistor T2. This also reduces the temperature and current dependency of the gain of the control transistor T2 and the dependency due to sample scatter.
  • the first regulating amplifier OP1 operating as a voltage regulator now tries to maintain the base current of the power transistor T1 by further increasing its output voltage until it finally reaches the positive modulation limit VCC.
  • the base of the control transistor T2 is now at a fixed potential VCC and the control transistor T2 thus operates in the basic circuit.
  • the collector current of the control transistor T2 and thus the output current I decrease to the extent that the output voltage of the second control amplifier OP2 increases.
  • the resistor R7 connected between the positive pole UA + of the output voltage UA and the inverting input of the second control amplifier OP2 achieves a declining characteristic of the supply voltage UA as a function of the output current I.
  • the combination of the two output signals of the first control amplifier OP1, which operates as a voltage regulator, and of the second control amplifier OP2, which operates as a current limiter, takes place only by one component, that is to say by the control transistor T2, which, depending on whether the voltage regulation or the current limitation is active, either in the emitter circuit or in Basic circuit works.
  • a double operation amplifier integrated in one component is used for the first and second control amplifiers OP1, OP2, the common-mode input voltage range of which includes the value of the potential VEE.
  • the use of a double operation amplifier leads not only to component reduction, but also to space and cost savings.
  • the polarity of the voltage of the base-emitter path of the control transistor T2 can be reversed.
  • the diode D1 antiparallel to the base-emitter path limits the voltage and thus prevents a breakdown of the base-emitter path.
  • the series connections of the capacitor C1 and the resistor R3 or of the capacitor C2 and the resistor R9 form negative feedback networks of the control amplifiers OP1, OP2, which are used for frequency response correction. They can be dimensioned independently for the respective control amplifier OP1, OP2.
  • the reference voltage Uref is generated, for example, using a zener diode or a bandgap reference element. Both the setpoints of the first and the second control amplifier are obtained from the one reference voltage Uref.
  • the power supply device with voltage control and current limitation also works reliably with very small differences between the input voltage UE and the supply voltage UA (low drop-out voltage). This results in higher efficiency and a higher supply voltage for the smallest input voltage.
  • a power supply device can be implemented in which all voltages and currents have the opposite polarity compared to the embodiment shown in the figure.
  • all transistors are replaced by their complementary types and the anode and cathode are interchanged for the diode D1.
  • a type is used whose common mode input voltage range includes the value of the potential VCC.

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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)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Die Erfindung betrifft eine Stromversorgungseinrichtung mit einem von einem Steuertransistor angesteuerten Leistungstransistor (T1), dessen Schaltstrecke jeweils zwischen einem Pol (UE+, UA+) einer ungeregelten Eingangsgleichspannung (UE) und einer geregelten Versorgungsspannung (UA) liegt, mit einem Strommeßwiderstand (R10), mit einem über eine erste Elektrode den Steuertransistor (T2) ansteuernden ersten Regelverstärker (OP1), der eine aus der Versorgungsspannung (UA) ableitbare Spannung mit einer ersten Referenzspannung (Uref) vergleicht, und mit einem zweiten Regelverstärker (OP2), der eine am Strommeßwiderstand (R10) abgreifbare Meßspannung (UM) mit einer zweiten Referenzspannung vergleicht. Die Spannungs- und Stromregelung soll einen geringen Bauteileaufwand sowie ein ausreichendes dynamisches Regelverhalten aufweisen. Es wird vorgeschlagen, daß der Ausgang des zweiten Regelverstärkers (OP2) an eine zweite Elektrode des Steuertransistors (T2) angeschlossen ist, wobei der Steuertransistor (T2) bei aktiver Spannungsregelung in Emitterschaltung und bei aktiver Strombegrenzung in Basisschaltung arbeitet.The invention relates to a power supply device with a power transistor (T1) controlled by a control transistor, the switching path of which lies between a pole (UE +, UA +) of an unregulated DC input voltage (UE) and a regulated supply voltage (UA), with a current measuring resistor (R10) a first control amplifier (OP1) which controls the control transistor (T2) via a first electrode and which compares a voltage which can be derived from the supply voltage (UA) with a first reference voltage (Uref), and with a second control amplifier (OP2) which R10) comparable measuring voltage (UM) with a second reference voltage. The voltage and current control should have a low component expenditure as well as sufficient dynamic control behavior. It is proposed that the output of the second control amplifier (OP2) be connected to a second electrode of the control transistor (T2), the control transistor (T2) working in the emitter circuit when the voltage control is active and in the base circuit when the current limitation is active.

Description

Die Erfindung betrifft eine Stromversorgungseinrichtung mit einem von einem Steuertransistor angesteuerten Lei­stungstransistor, dessen Schaltstrecke jeweils zwischen einem Pol einer ungeregelten Eingangsgleichspannung und einer geregelten Versorgungsspannung liegt, mit einem Strommeßwiderstand, mit einem über eine erste Elektrode den Steuertransistor ansteuernden ersten Regelverstärker, der eine aus der Versorgungsspannung ableitbare Spannung mit einer ersten Referenzspannung vergleicht, und mit ei­nem zweiten Regelverstärker, der eine am Strommeßwider­stand abgreifbare Meßspannung mit einer zweiten Referenz­spannung vergleicht.The invention relates to a power supply device with a power transistor controlled by a control transistor, the switching path of which lies in each case between a pole of an unregulated DC input voltage and a regulated supply voltage, with a current measuring resistor, with a first control amplifier which drives the control transistor via a first electrode and which has a derivable from the supply voltage Comparing voltage with a first reference voltage, and with a second control amplifier, which compares a measuring voltage that can be tapped at the current measuring resistor with a second reference voltage.

Zum Betrieb von elektronischen Schaltungen benötigt man Gleichspannungen, bei denen ein gewünschter Spannungswert auch bei Netzspannungsschwankungen, Laststromschwankungen sowie Temperaturschwankungen innerhalb eines bestimmten Toleranzbereiches eingehalten wird. Aus diesen Gründen ist eine, beispielsweise aus der Netzspannung durch Gleichrichtung gewonnene, Gleichspannung nicht direkt als Betriebsspannung für elektronische Schaltungen geeignet, sondern muß durch eine nachgeschaltete Spannungsregelung und Strombegrenzung stabilisiert und geglättet werden.To operate electronic circuits, DC voltages are required at which a desired voltage value is maintained within a certain tolerance range, even in the event of mains voltage fluctuations, load current fluctuations and temperature fluctuations. For these reasons, a DC voltage obtained, for example, from the mains voltage by rectification, is not directly suitable as an operating voltage for electronic circuits, but must be stabilized and smoothed by a downstream voltage regulation and current limitation.

Eine Stromversorgungseinrichtung der eingangs genannten Art ist aus US-PS 4,346,342 bekannt. Die Spannungsrege­lung wird dabei aus einem ersten Regelverstärker gebil­det, der eine am invertierenden Eingang liegende, am Ab­griff eines ausgangsseitigen Spannungsteilers gewonnene, Spannung mit einer am nichtinvertierenden Eingang liegen­ den Referenzspannung vergleicht. Der Ausgang des ersten Regelverstärkers ist mit der Basis des Steuertransistors verbunden. Die Strombegrenzung wird aus einem zweiten Re­gelverstärker gebildet, der eine am Strommeßwiderstand abgreifbare Meßspannung mit einer zweiten Referenzspan­nung vergleicht. Der Ausgang des zweiten Regelverstärkers ist über eine Diode ebenfalls mit der Basis des Steuer­transistors verbunden, während der Emitter des Steuer­transistors über einen Widerstand mit einem Bezugspoten­tial verbunden ist. Somit wird die Basis des Steuertran­sistors sowohl von dem ersten Regelverstärker zur Span­nungsregelung als auch von dem zweiten Regelverstärker zur Strombegrenzung angesteuert. Darüber hinaus werden die Referenzspannungen der beiden Regelverstärker aus zwei getrennten Referenzspannungen erzeugt.A power supply device of the type mentioned is known from US-PS 4,346,342. The voltage control is formed from a first control amplifier, which has a voltage at the inverting input, obtained at the tap of an output-side voltage divider, with a voltage at the non-inverting input compares the reference voltage. The output of the first control amplifier is connected to the base of the control transistor. The current limitation is formed by a second control amplifier, which compares a measuring voltage that can be tapped at the current measuring resistor with a second reference voltage. The output of the second control amplifier is also connected to the base of the control transistor via a diode, while the emitter of the control transistor is connected to a reference potential via a resistor. The base of the control transistor is thus driven both by the first control amplifier for voltage regulation and by the second control amplifier for current limitation. In addition, the reference voltages of the two control amplifiers are generated from two separate reference voltages.

Der Erfindung liegt die Aufgabe zugrunde, eine Stromver­sorgungseinrichtung der eingangs genannten Art anzugeben, die einen geringen Bauteileaufwand sowie ein ausreichen­des dynamisches Regelverhalten aufweist.The invention is based on the object of specifying a power supply device of the type mentioned at the outset which has a low outlay on components and an adequate dynamic control behavior.

Diese Aufgabe wird bei einer Stromversorgungseinrichtung der eingangs genannten Art dadurch gelöst, daß der Aus­gang des zweiten Regelverstärkers an eine zweite Elektro­de des Steuertransistors angeschlossen ist, wobei der Steuertransistor bei aktiver Spannungsregelung in Emit­terschaltung und bei aktiver Strombegrenzung in Basis­schaltung arbeitet.This object is achieved in a power supply device of the type mentioned above in that the output of the second control amplifier is connected to a second electrode of the control transistor, the control transistor operating in the emitter circuit with active voltage control and in the base circuit with active current limitation.

Dabei ist die erste Elektrode insbesondere die Basis und die zweite Elektrode der Emitter des Steuertransistors und der Steuertransistor arbeitet bei aktiver Spannungs­regelung in Emitterschaltung und bei aktiver Strombegren­zung in Basisschaltung. Im Normalbetrieb ist dann der er­ste Regelverstärker zur Spannungsregelung aktiv. Über­ steigt die Meßspannung am Strommeßwiderstand den durch die zweite Referenzspannung vorgegebenen Grenzwert und steigt dessen Ausgangsspannung an, so wird der Steuer­transistor in Basisschaltung betrieben und der Laststrom des Steuertransistors sinkt in dem Maße, in dem die Meß­spannung ansteigt. Somit wird auf einfache Weise durch die Verknüpfung der beiden Regelverstärker mit Hilfe des Steuertransistors entweder die Spannungsregelung oder die Strombegrenzung aktiv und bei geringem Bauteileaufwand ein ausreichendes dynamisches Regelverhalten der Strom­versorgungseinrichtung erreicht.The first electrode is in particular the base and the second electrode is the emitter of the control transistor and the control transistor operates in the emitter circuit with active voltage regulation and in the base circuit with active current limitation. The first control amplifier for voltage regulation is then active in normal operation. over If the measuring voltage across the current measuring resistor rises to the limit value specified by the second reference voltage and its output voltage rises, the control transistor is operated in the basic circuit and the load current of the control transistor drops to the extent that the measuring voltage rises. Thus, by linking the two control amplifiers with the aid of the control transistor, either the voltage control or the current limitation is activated in a simple manner and sufficient dynamic control behavior of the power supply device is achieved with a low component expenditure.

Bei einer vorteilhaften Ausgestaltungsform liegt zwischen dem Ausgang des zweiten Regelverstärkers und dem Emitter des Steuertransistors ein Widerstand. Mit Hilfe des Wi­derstands wird eine Stromgegenkopplung erreicht, so daß insbesondere die Temperatur- und Stromabhängigkeit der Verstärkung des Steuertransistors sowie die Abhängigkeit durch Exemplarstreuungen verringert wird.In an advantageous embodiment, there is a resistor between the output of the second control amplifier and the emitter of the control transistor. A current negative feedback is achieved with the help of the resistor, so that in particular the temperature and current dependency of the gain of the control transistor and the dependency due to sample scatter is reduced.

Bei einer Ausgestaltungsform ist der invertierende Ein­gang des zweiten Regelverstärkers über einen Widerstand mit dem Pol der geregelten Versorgungsspannung verbun­den. Hierdurch wird eine rückläufige Kennlinie der gere­gelten Versorgungsspannung in Abhängigkeit des Ausgangs­stroms erreicht.In one embodiment, the inverting input of the second control amplifier is connected to the pole of the regulated supply voltage via a resistor. This results in a declining characteristic of the regulated supply voltage as a function of the output current.

Bei einer weiteren Ausgestaltungsform wird die erste und die zweite Referenzspannung aus einer einzigen Referenz­spannungsquelle gewonnen. Diese ist beispielsweise als Zenerdiode oder als Bandabstandsreferenzelement ausgebil­det. Dabei wird beispielsweise die erste Referenzspannung direkt aus der Referenzspannungsquelle gewonnen, während die zweite Referenzspannung beispielsweise mit Hilfe ei­nes Spannungsteilers aus der Referenzspannungsquelle ge­ wonnen werden kann. Die Gewinnung der beiden Referenz­spannungen aus einer einzigen Referenzspannungsquelle führt zu einer weiteren Bauteileeinsparung.In a further embodiment, the first and the second reference voltage are obtained from a single reference voltage source. This is designed, for example, as a zener diode or as a bandgap reference element. For example, the first reference voltage is obtained directly from the reference voltage source, while the second reference voltage is obtained from the reference voltage source, for example with the aid of a voltage divider can be won. Obtaining the two reference voltages from a single reference voltage source leads to further component savings.

Bei einer weiteren Ausgestaltungsform liegt antiparallel zur Basis-Emitter-Strecke des Steuertransistors eine Gleichrichterdiode. Diese begrenzt die Spannung an der Basis-Emitter-Strecke und verhindert so einen möglichen Durchbruch, der beim Übergang von Spannungsregelung auf Strombegrenzung, d.h. beim Übergang des Betriebszustandes des Steuertransistors von Emitterschaltung in Basisschal­tung, auftreten kann.In a further embodiment, a rectifier diode is located antiparallel to the base-emitter path of the control transistor. This limits the voltage on the base-emitter path and thus prevents a possible breakdown that occurs when switching from voltage control to current limitation, i.e. can occur during the transition of the operating state of the control transistor from the emitter circuit to the base circuit.

Bei einer Ausgestaltungsform ist der erste Regelverstär­ker über die Reihenschaltung eines Widerstands und eines Kondensators gegengekoppelt. Hierdurch wird eine Fre­quenzgangkorrektur des ersten Regelverstärkers ermög­licht.In one embodiment, the first control amplifier is fed back through the series connection of a resistor and a capacitor. This enables a frequency response correction of the first control amplifier.

Bei einer weiteren Ausgestaltungform ist der zweite Re­gelverstärker über die Reihenschaltung eines Widerstands und eines Kondensators gegengekoppelt. Hierdurch ist eine Frequenzgangkorrektur des zweiten Regelverstärkers unab­hängig von der des ersten Regelverstärkers möglich.In a further embodiment, the second control amplifier is fed back through the series connection of a resistor and a capacitor. This makes it possible to correct the frequency response of the second control amplifier independently of that of the first control amplifier.

Im folgenden wird die Erfindung anhand des in der Figur dargestellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail below on the basis of the exemplary embodiment shown in the figure.

Die Figur zeigt eine Stromversorgungseinrichtung mit Spannungsregelung und Strombegrenzung.The figure shows a power supply device with voltage regulation and current limitation.

Bei dem in der Figur dargestellten Ausführungsbeispiel liegt die Spannungsregelung und Strombegrenzung zwischen einer Stromversorgungseinrichtung 1, die eine ungeregelte Gleichspannung UE (Eingangsspannung) liefert und einen von einem Ausgangsstrom I durchflossenen Lastwider­stand RL, an dem eine geregelte Versorgungsspannung UA (Ausgangsspannung) anliegt. In einem ersten Längs­zweig ZW1 liegt ein PNP-Leistungstransistor T1, dessen Basis-Emitter-Strecke über einen Widerstand R4 verbunden ist. Der Leistungstransistor T1 wird von einem Steuer­transistor T2 angesteuert. Dazu ist der Kollektor des Steuertransistors T2 mit der Basis des Leistungstransis­tors T1 verbunden. Parallel zum Lastwiderstand RL liegt ein Kondensator C3 sowie die Reihenschaltung eines ersten Widerstands R1 und eines zweiten Widerstands R2. Der Mittenabgriff der Widerstände R1, R2 ist mit dem inver­tierenden Eingang eines ersten Regelverstärkers OP1 ver­bunden. Zwischen dem nichtinvertierenden Eingang des er­sten Regelverstärkers OP1 und dem negativen Bezugspoten­tial UA- der Ausgangsspannung UA liegt eine Referenz­spannungsquelle Uref. Der mit dem nichtinvertierenden Eingang des ersten Regelverstärkers OP1 verbundene Pol der Referenzspannungsquelle Uref ist über einen Wider­stand R6 mit dem invertierenden Eingang eines zweiten Re­gelverstärkers OP2 verbunden. Der invertierende Eingang des zweiten Regelverstärkers OP2 ist außerdem über einen Widerstand R7 mit dem Positiven Pol UA+ der Ausgangs­spannung UA verbunden. In einem zweiten Längszweig ZW2 liegt zwischen dem negativen Pol UE- der ungeregelten Eingangsspannung UE und dem negativen Pol UA- der gere­gelten Ausgangsspannung UA ein Strommeßwiderstand R10, an dem eine Meßspannung UM anliegt. Der mit dem negativen Pol UA- der Ausgangsspannung UA verbundene Anschluß des Strommeßwiderstands R10 ist mit dem nichtinvertierenden Eingang des zweiten Regelverstärkers OP2 und der mit dem negativen Pol UE- der ungeregelten Gleichspannung UE ver­bundene Anschluß über einen Widerstand R8 mit dem inver­tierenden Eingang des zweiten Regelverstärkers OP2 ver­bunden. Zwischen dem invertierenden Eingang des ersten Regelverstärkers OP1 und dem mit der Basis des Steuer­transistors T2 verbundenen Ausgang des ersten Regelver­stärkers OP1 liegt die Reihenschaltung eines Wider­stands R3 und eines Kondensators C1. Zwischen dem inver­tierenden Eingang des zweiten Regelverstärkers OP2 und dem Ausgang des zweiten Regelverstärkers OP2 liegt die Reihenschaltung eines Widerstands R9 und eines Kondensa­tors C2. Der Ausgang des zweiten Regelverstärkers OP2 ist über einen Widerstand R5 mit dem Emitter des Steuertran­sistors T2 verbunden. Antiparallel zur Basis-Emitter-­Strecke des Steuertransistors T2 ist eine Gleichrichter­diode D1 angeordnet.In the exemplary embodiment shown in the figure, the voltage regulation and current limitation lie between a power supply device 1, which supplies an unregulated direct voltage UE (input voltage) and one Load resistor RL through which an output current I flows and to which a regulated supply voltage UA (output voltage) is present. In a first series branch ZW1 there is a PNP power transistor T1, the base-emitter path of which is connected via a resistor R4. The power transistor T1 is driven by a control transistor T2. For this purpose, the collector of the control transistor T2 is connected to the base of the power transistor T1. A capacitor C3 and the series connection of a first resistor R1 and a second resistor R2 are connected in parallel with the load resistor RL. The center tap of the resistors R1, R2 is connected to the inverting input of a first control amplifier OP1. A reference voltage source Uref is located between the non-inverting input of the first control amplifier OP1 and the negative reference potential UA- of the output voltage UA. The pole of the reference voltage source Uref connected to the non-inverting input of the first control amplifier OP1 is connected via a resistor R6 to the inverting input of a second control amplifier OP2. The inverting input of the second control amplifier OP2 is also connected via a resistor R7 to the positive pole UA + of the output voltage UA. In a second series branch ZW2, between the negative pole UE- of the unregulated input voltage UE and the negative pole UA- of the regulated output voltage UA, there is a current measuring resistor R10, to which a measuring voltage UM is applied. The connection of the current measuring resistor R10 connected to the negative pole UA- of the output voltage UA is connected to the non-inverting input of the second control amplifier OP2 and the connection connected to the negative pole UE- of the unregulated direct voltage UE is connected via a resistor R8 to the inverting input of the second control amplifier OP2 connected. Between the inverting input of the first The control amplifier OP1 and the output of the first control amplifier OP1 connected to the base of the control transistor T2 are connected in series with a resistor R3 and a capacitor C1. The series connection of a resistor R9 and a capacitor C2 lies between the inverting input of the second control amplifier OP2 and the output of the second control amplifier OP2. The output of the second control amplifier OP2 is connected via a resistor R5 to the emitter of the control transistor T2. A rectifier diode D1 is arranged antiparallel to the base-emitter path of the control transistor T2.

Die beiden Regelverstärker OP1, OP2 weisen eine gemeinsa­me Spannungsversorgung mit einem Positiven Anschluß VCC und einem negativen Anschluß VEE auf. Die dazu benötigte Spannung wird dabei direkt an der Gleichspannung UE abge­griffen. Dazu ist der positive Anschluß VCC mit dem posi­tiven Pol UE+ und der negative Anschluß VEE mit dem nega­tiven Pol UE- der ungeregelten Gleichspannung UE verbun­den. In Anwendungsfällen, in denen die ungeregelte Ein­gangsgleichspannung die maximal zulässige Versorgungs­spannung der Regelverstärker OP1, OP2 übersteigt, kann deren Versorgungsspannung auch über eine einfache Stabi­lisierungsschaltung gewonnen werden.The two control amplifiers OP1, OP2 have a common voltage supply with a positive connection VCC and a negative connection VEE. The voltage required for this is tapped directly from the direct voltage UE. For this purpose, the positive connection VCC is connected to the positive pole UE + and the negative connection VEE is connected to the negative pole UE- of the unregulated direct voltage UE. In applications in which the unregulated DC input voltage exceeds the maximum permissible supply voltage for the control amplifiers OP1, OP2, their supply voltage can also be obtained via a simple stabilization circuit.

Im Normalbetrieb ist der erste Regelverstärker OP1 zur Spannungsregelung aktiv. In diesem Betriebszustand er­folgt keine Begrenzung des Ausgangsstroms I durch den zweiten Regelverstärker OP2. Der Ausgang des zweiten Re­gelverstärkers OP2 liegt auf dem Potential VEE. Damit liegt auch der mit dem Emitter des Steuertransistors T2 verbundene Anschluß des Widerstands R5 auf dem Poten­tial VEE und der Steuertransistor T2 arbeitet in Emitter­schaltung mit Stromgegenkopplung.In normal operation, the first control amplifier OP1 is active for voltage regulation. In this operating state, the output current I is not limited by the second control amplifier OP2. The output of the second control amplifier OP2 is at the potential VEE. Thus, the connection of the resistor R5 connected to the emitter of the control transistor T2 is at the potential VEE and the control transistor T2 operates in an emitter circuit with current feedback.

Der Kollektorstrom des Steuertransistors T2 und damit auch der Basisstrom des Leistungstransistors T1 ist in Folge der Stromgegenkopplung des Steuertransistors T2 durch den Widerstand R5 proportional zur Basisspannung des Steuertransistors T2. Der Ausgangsstrom I und damit auch der Kollektorstrom des Leistungstransistors T1 ist wiederum proportional zum Basisstrom des Leistungstran­sistors T1. Der Ausgangsstrom I wird in Abhängigkeit vom momentanen Wert des Lastwiderstands RL so geregelt, daß die Versorgungsspannung UA am Lastwiderstand RL konstant bleibt. Dabei stellt sich die Ausgangsspannung des ersten Regelverstärkers OP1 und damit die Spannung an der Basis des Steuertransistors T2 so ein, daß die am invertieren­den Eingang des ersten Regelverstärkers OP1 anliegende Spannung, die durch Teilung über den Spannungsteiler R1, R2 gebildet wird, gleich der am nichtinvertierenden Ein­gang anliegenden Referenzspannung Uref ist. Die Stromge­genkopplung des Steuertransistors T2 durch den Emitter­widerstand R5 hat den Vorteil, daß die Verstärkung des Steuertransistors T2 weitgehend stabil bleibt und im we­sentlichen durch den Widerstandswert des Emitterwider­stands R5 bestimmt wird und weniger von der nichtlinearen Übertragungskennlinie des Steuertransistors T2 abhängig ist. Somit wird auch die Temperatur- und Stromabhängig­keit der Verstärkung des Steuertransistors T2 sowie die Abhängigkeit durch Exemplarstreuungen reduziert.The collector current of the control transistor T2 and thus also the base current of the power transistor T1 is proportional to the base voltage of the control transistor T2 as a result of the negative current feedback of the control transistor T2 through the resistor R5. The output current I and thus also the collector current of the power transistor T1 is in turn proportional to the base current of the power transistor T1. The output current I is regulated as a function of the instantaneous value of the load resistor RL so that the supply voltage UA at the load resistor RL remains constant. The output voltage of the first control amplifier OP1 and thus the voltage at the base of the control transistor T2 are such that the voltage present at the inverting input of the first control amplifier OP1, which is formed by division via the voltage divider R1, R2, is equal to that at the non-inverting one Input reference voltage Uref. The current feedback of the control transistor T2 through the emitter resistor R5 has the advantage that the gain of the control transistor T2 remains largely stable and is essentially determined by the resistance value of the emitter resistor R5 and is less dependent on the non-linear transmission characteristic of the control transistor T2. This also reduces the temperature and current dependency of the gain of the control transistor T2 and the dependency due to sample scatter.

Übersteigt der Spannungsabfall UM am Strommeßwider­stand R10 den durch die Widerstände R6, R7, R8 sowie die Referenzspannung Uref vorgegebenen Grenzwert, so steigt die Ausgangsspannung des zweiten Regelverstärkers OP2 an. In diesem Betriebszustand wird der zweite Regelver­stärker OP2 zur Strombegrenzung aktiv. Dadurch sinkt der Kollektorstrom des Steuertransistors T2 und somit eben­falls der Basisstrom des Leistungstransistors T1. Der als Spannungsregler arbeitende erste Regelverstärker OP1 ver­sucht jetzt durch weiteres Erhöhen seiner Ausgangsspan­nung den Basisstrom des Leistungstransistors T1 aufrecht zu erhalten, bis diese schließlich die Positive Aussteu­erungsgrenze VCC erreicht. Die Basis des Steuertransi­stors T2 liegt jetzt auf festem Potential VCC und der Steuertransistor T2 arbeitet somit in Basisschaltung. Der Kollektorstrom des Steuertransistors T2 und damit der Ausgangsstrom I sinken in dem Maße, in dem die Ausgangs­spannung des zweiten Regelverstärkers OP2 ansteigt. Bei dem in der Figur dargestellten Ausführungsbeispiel wird durch den zwischen dem positivem Pol UA+ der Ausgangs­spannung UA und dem invertierenden Eingang des zweiten Regelverstärkers OP2 geschalteten Widerstand R7 eine rückläufige Kennlinie der Versorgungsspannung UA in Ab­hängigkeit des Ausgangsstroms I erreicht. Die Verknüpfung der beiden Ausgangssignale des als Spannungsregler arbei­tenden ersten Regelverstärkers OP1 und des als Strombe­grenzung arbeitenden zweiten Regelverstärkers OP2 erfolgt lediglich durch ein Bauteil, d.h. durch den Steuertransi­stor T2, der abhängig davon, ob die Spannungsregelung oder die Strombegrenzung aktiv ist, entweder in Emitter­schaltung oder in Basisschaltung arbeitet. Durch die Stromgegenkopplung mit dem Widerstand R5 wird erreicht, daß die Verstärkung des Steuertransistors T2 in beiden Betriebszuständen weitgehend konstant bleibt. Bei einer vorteilhaften Ausgestaltungsform wird für den ersten und zweiten Regelverstärker OP1, OP2 ein in einem Bauteil in­tergrierter Doppeloperationsverstärker verwendet, dessen Gleichtakt-Eingangsspannungsbereich den Wert des Poten­tials VEE einschließt. Der Einsatz eines Doppelopera­tionsverstärkers führt neben einer Bauteilereduzierung auch zu einer Platz- und Kosteneinsparung.If the voltage drop UM at the current measuring resistor R10 exceeds the limit value specified by the resistors R6, R7, R8 and the reference voltage Uref, the output voltage of the second control amplifier OP2 increases. In this operating state, the second control amplifier OP2 becomes active for current limitation. As a result, the collector current of the control transistor T2 and thus also the base current of the power transistor T1 decrease. The as The first regulating amplifier OP1 operating as a voltage regulator now tries to maintain the base current of the power transistor T1 by further increasing its output voltage until it finally reaches the positive modulation limit VCC. The base of the control transistor T2 is now at a fixed potential VCC and the control transistor T2 thus operates in the basic circuit. The collector current of the control transistor T2 and thus the output current I decrease to the extent that the output voltage of the second control amplifier OP2 increases. In the exemplary embodiment shown in the figure, the resistor R7 connected between the positive pole UA + of the output voltage UA and the inverting input of the second control amplifier OP2 achieves a declining characteristic of the supply voltage UA as a function of the output current I. The combination of the two output signals of the first control amplifier OP1, which operates as a voltage regulator, and of the second control amplifier OP2, which operates as a current limiter, takes place only by one component, that is to say by the control transistor T2, which, depending on whether the voltage regulation or the current limitation is active, either in the emitter circuit or in Basic circuit works. The current feedback with the resistor R5 ensures that the gain of the control transistor T2 remains largely constant in both operating states. In an advantageous embodiment, a double operation amplifier integrated in one component is used for the first and second control amplifiers OP1, OP2, the common-mode input voltage range of which includes the value of the potential VEE. The use of a double operation amplifier leads not only to component reduction, but also to space and cost savings.

Beim Übergang von Spannungsregelung auf Strombegrenzung, d.h. beim Übergang des Betriebszustands des Steuertransi­stors T2 von Emitterschaltung in Basisschaltung, kann sich die Polarität der Spannung der Basis-Emitter-Strecke des Steuertransistors T2 umkehren. Die antiparallel zur Basis-Emitter-Strecke liegende Diode D1 begrenzt in die­sem Fall die Spannung und verhindert so einen Durchbruch der Basis-Emitter-Strecke. Die Reihenschaltungen des Kon­densators C1 und des Widerstands R3 bzw. des Kondensa­tors C2 und des Widerstands R9 bilden Gegenkopplungsnetz­werke der Regelverstärker OP1, OP2, die der Frequenzgang­korrektur dienen. Sie können unabhängig für den jeweili­gen Regelverstärker OP1, OP2 dimensioniert werden. Die Referenzspannung Uref wird beispielsweise mit Hilfe einer Zenerdiode oder einem Bandabstandsreferenzelement er­zeugt. Aus der einen Referenzspannung Uref werden sowohl die Sollwerte des ersten als auch des zweiten Regelver­stärkers gewonnen. Die Stromversorgungseinrichtung mit Spannungsregelung und Strombegrenzung arbeitet auch noch zuverlässig bei sehr kleinen Differenzen zwischen der Eingangsspannung UE und der Versorgungsspannung UA (Low-­Drop-Out-Voltage). Dadurch ergibt sich ein höherer Wir­kungsgrad sowie eine höhere Versorgungsspannung bei der kleinsten vorkommenden Eingangsspannung.When changing from voltage regulation to current limitation, ie when the operating state of the control transistor T2 changes from the emitter circuit to the base circuit, the polarity of the voltage of the base-emitter path of the control transistor T2 can be reversed. In this case, the diode D1 antiparallel to the base-emitter path limits the voltage and thus prevents a breakdown of the base-emitter path. The series connections of the capacitor C1 and the resistor R3 or of the capacitor C2 and the resistor R9 form negative feedback networks of the control amplifiers OP1, OP2, which are used for frequency response correction. They can be dimensioned independently for the respective control amplifier OP1, OP2. The reference voltage Uref is generated, for example, using a zener diode or a bandgap reference element. Both the setpoints of the first and the second control amplifier are obtained from the one reference voltage Uref. The power supply device with voltage control and current limitation also works reliably with very small differences between the input voltage UE and the supply voltage UA (low drop-out voltage). This results in higher efficiency and a higher supply voltage for the smallest input voltage.

Bei einer weiteren, in der Figur nicht dargestellten Aus­führungsform ist eine Stromversorgungseinrichtung reali­sierbar, bei der gegenüber dem in der Figur dargestellten Ausführungsbeispiel alle Spannungen und Ströme umgekehr­te Polarität aufweisen. Zudem sind alle Transistoren durch ihre Komplementärtypen ersetzt und bei der Diode D1 Anode und Kathode vertauscht. Für den zweiten Regelver­stärker OP2 wird ein Typ verwendet, dessen Gleichtakt-­Eingangsspannungsbereich den Wert des Potentials VCC ein­schließt.In a further embodiment, not shown in the figure, a power supply device can be implemented in which all voltages and currents have the opposite polarity compared to the embodiment shown in the figure. In addition, all transistors are replaced by their complementary types and the anode and cathode are interchanged for the diode D1. For the second control amplifier OP2, a type is used whose common mode input voltage range includes the value of the potential VCC.

Claims (7)

1. Stromversorgungseinrichtung mit einem von einem Steu­ertransistor (T2) angesteuerten Leistungstransistor (T1), dessen Schaltstrecke jeweils zwischen einem Pol (UE+, UA+) einer ungeregelten Eingangsgleichspannung (UE) und einer geregelten Versorgungsspannung (UA) liegt, mit ei­nem Strommeßwiderstand (R10), mit einem über eine erste Elektrode den Steuertransistor (T2) ansteuernden ersten Regelverstärker (OP1), der eine aus der Versorgungsspan­nung (UA) ableitbare Spannung mit einer ersten Referenz­spannung (Uref) vergleicht, und mit einem zweiten Regel­verstärker (OP2), der eine am Strommeßwiderstand (R10) abgreifbare Meßspannung (UM) mit einer zweiten Referenz­spannung vergleicht,
dadurch gekennzeichnet,
daß der Ausgang des zweiten Regelverstärkers (OP2) an ei­ne zweite Elektrode des Steuertransistors (T2) ange­schlossen ist, wobei der Steuertransistor (T2) bei akti­ver Spannungsregelung in Emitterschaltung und bei aktiver Strombegrenzung in Basisschaltung arbeitet.1. Power supply device with a power transistor (T1) controlled by a control transistor (T2), the switching path of which lies between a pole (UE +, UA +) of an unregulated DC input voltage (UE) and a regulated supply voltage (UA), with a current measuring resistor (R10), with a first control amplifier (OP1), which controls the control transistor (T2) and which compares a voltage that can be derived from the supply voltage (UA) with a first reference voltage (Uref), and with a second control amplifier (OP2), which has a current measuring resistor (R10) compares the measurable measuring voltage (UM) with a second reference voltage,
characterized,
that the output of the second control amplifier (OP2) is connected to a second electrode of the control transistor (T2), the control transistor (T2) working in the emitter circuit with active voltage control and in the base circuit with active current limitation. 2. Stromversorgungseinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß zwischen dem Ausgang des zweiten Regelverstär­kers (OP2) und dem Emitter des Steuertransistors (T2) ein Widerstand (R5) liegt.2. Power supply device according to claim 1,
characterized,
that between the output of the second control amplifier (OP2) and the emitter of the control transistor (T2) there is a resistor (R5). 3. Stromversorgungseinrichtung nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,
daß der invertierende Eingang des zweiten Regelverstär­ kers (OP2) über einen Widerstand (R7) mit dem Pol (UA+) der geregelten Versorgungsspannung (UA) verbunden ist.3. Power supply device according to one of claims 1 or 2,
characterized,
that the inverting input of the second control amplifier kers (OP2) is connected via a resistor (R7) to the pole (UA +) of the regulated supply voltage (UA). 4. Stromversorgungseinrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die erste und die zweite Referenzspannung aus einer einzigen Referenzspannungsquelle (Uref) gewonnen wird.4. Power supply device according to one of claims 1 to 3,
characterized,
that the first and the second reference voltage are obtained from a single reference voltage source (Uref). 5. Stromversorgungseinrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß antiparallel zur Basis-Emitter-Strecke des Steuer­transistors (T2) eine Gleichrichterdiode (D1) liegt.5. Power supply device according to one of claims 1 to 4,
characterized,
that a rectifier diode (D1) is antiparallel to the base-emitter path of the control transistor (T2). 6. Stromversorgungseinrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß der erste Regelverstärker (OP1) über die Reihenschal­tung eines Widerstands (R3) und eines Kondensators (C1) gegengekoppelt ist.6. Power supply device according to one of claims 1 to 5,
characterized,
that the first control amplifier (OP1) is fed back through the series connection of a resistor (R3) and a capacitor (C1). 7. Stromversorgungseinrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß der zweite Regelverstärker über die Reihenschaltung eines Widerstands (R9) und eines Kondensators (C2) gegen­gekoppelt ist.7. Power supply device according to one of claims 1 to 6,
characterized,
that the second control amplifier is fed back through the series connection of a resistor (R9) and a capacitor (C2).
EP90202535A 1989-09-30 1990-09-25 Power supply arrangement with voltage regulation and current limiting Expired - Lifetime EP0421516B1 (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0497106A2 (en) * 1991-01-26 1992-08-05 BOSCH TELECOM ÖFFENTLICHE VERMITTLUNGSTECHNIK GmbH Circuit arrangement for voltage and current regulation
EP0497106A3 (en) * 1991-01-26 1993-03-31 Bosch Telecom Oeffentliche Vermittlungstechnik Gmbh Circuit arrangement for voltage and current regulation
EP0576772A1 (en) * 1992-06-25 1994-01-05 STMicroelectronics S.r.l. Programmable-output voltage regulator
US5453678A (en) * 1992-06-25 1995-09-26 Sgs-Thomson Microelectronics S.R.L. Programmable-output voltage regulator
WO1995012916A1 (en) * 1993-10-30 1995-05-11 Robert Bosch Gmbh Remote power supply unit
US6172491B1 (en) 1993-10-30 2001-01-09 Robert Bosch Gmbh Remote feeding device
WO1995031762A1 (en) * 1994-05-16 1995-11-23 Thomson Consumer Electronics, Inc. Voltage regulator
WO1995031761A1 (en) * 1994-05-16 1995-11-23 Thomson Consumer Electronics, Inc. Dual voltage voltage regulator with foldback current limiting
CN102625512A (en) * 2011-01-27 2012-08-01 英飞特电子（杭州）有限公司 Current sharing circuit
EP2637160A1 (en) * 2012-03-07 2013-09-11 Samsung Display Co., Ltd. Power supply unit and organic light emitting display including the same
US9514671B2 (en) 2012-03-07 2016-12-06 Samsung Display Co., Ltd. Power supply unit and organic light emitting display including the same

Also Published As

Publication number Publication date
US5041777A (en) 1991-08-20
JPH03123916A (en) 1991-05-27
EP0421516A3 (en) 1991-08-21
EP0421516B1 (en) 1995-12-20
DE3932776A1 (en) 1991-04-11
DE59009980D1 (en) 1996-02-01

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