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DE102005014992A1 - Switching arrangement for DC power supply, has switching controller whose feedback branch is controlled such that potential between juncture of voltage divider and connection point of load is varied based on output current - Google Patents

Switching arrangement for DC power supply, has switching controller whose feedback branch is controlled such that potential between juncture of voltage divider and connection point of load is varied based on output current Download PDF

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DE102005014992A1
DE102005014992A1 DE200510014992 DE102005014992A DE102005014992A1 DE 102005014992 A1 DE102005014992 A1 DE 102005014992A1 DE 200510014992 DE200510014992 DE 200510014992 DE 102005014992 A DE102005014992 A DE 102005014992A DE 102005014992 A1 DE102005014992 A1 DE 102005014992A1
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Prior art keywords
load
connection point
output current
voltage divider
feedback branch
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DE200510014992
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German (de)
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Arnold Klamm
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Siemens Corp
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Siemens Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Es wird eine Schaltungsanordnung mti einem Schaltregler (Sr) vorgeschlagen, welcher zur Versorgung einer Last (RL) mit einem Ausgangsstrom (Ia) vorgesehen ist. Durch geeignete Maßnahmen ist die Schaltungsanordnung für einen Einsatz in parallel zu schaltenden Stromversorgungen einsetzbar.A circuit arrangement with a switching regulator (Sr) is proposed which is provided for supplying a load (RL) with an output current (Ia). By suitable measures, the circuit arrangement can be used for use in parallel to switching power supplies.

Description

Die Erfindung betrifft eine Schaltungsanordnung mit einem Schaltregler, welcher zur Versorgung einer Last mit einem Ausgangsstrom vorgesehen ist, gemäß dem Oberbegriff des Anspruchs 1.The Invention relates to a circuit arrangement with a switching regulator, which is intended to supply a load with an output current is, according to the generic term of claim 1.

Eine derartige Schaltungsanordnung ist allgemein bekannt und wird beispielsweise in DC-Stromversorgungen für Automatisierungsgeräte eingesetzt. Die mit einem Strom zu versorgende Last ist parallel zu einem Spannungsteiler geschaltet, welcher an einem Bezugspotential und an einem Anschlusspunkt angeschlossen ist. Dabei ist ein Rückkopplungszweig des Schaltreglers an einem Verbindungspunkt dieses Spannungsteilers angeschlossen, wobei der Schaltregler unabhängig vom Ausgangsstrom am Rückkopplungszweig eine konstante Spannung einstellt. Es kann nun vorkommen, dass aufgrund einer Laständerung ein Versorgungsstrom erforderlich ist, welcher den maximalen Versorgungsstrom einer DC-Stromversorgung überschreitet.A Such circuitry is well known and will, for example in DC power supplies for automation devices used. The load to be supplied with a current is parallel connected to a voltage divider, which at a reference potential and connected to a connection point. Here is a feedback branch the switching regulator at a connection point of this voltage divider connected, wherein the switching regulator independent of the output current at the feedback branch sets a constant voltage. It can happen now that due a load change a supply current is required, which is the maximum supply current exceeds a DC power supply.

In diesem Fall werden gewöhnlich DC-Stromversorgungen parallel geschaltet, wobei jede DC-Stromversorgung in Reihe zu der Last mit geeigneten Widerständen versehen ist. Nachteilig ist dabei allerdings die hohe Verlustleistung, welche durch diese Widerstände bewirkt wird.In this case will become ordinary DC power supplies are connected in parallel, with each DC power supply in series with the load is provided with suitable resistors. adversely However, this is the high power loss, which by this resistors is effected.

Es ist auch möglich, parallel geschaltete DC-Stromversorgungen mit Symmetrierschaltungen in Form von so genannten Loadshare-Controllern zu versehen. Diese Loadshare-Controller tauschen über eine geeignete Kommunikationsverbindung Informationen aus, um einen entsprechenden Versorgungsstrom in jeder DC-Stromversorgung einzustellen. Dabei ist die Kommunikation zwischen Loadshare-Controllern störanfällig, wodurch die Information im Hinblick auf die einzustellenden Ströme der jeweiligen Stromversorgungen fehlerhaft sein kann.It is possible, too, Parallel-connected DC power supplies with balancing circuits in the form of so-called load-share controllers. These Loadshare controllers exchange a suitable communication connection information out to a set the appropriate supply current in each DC power supply. The communication between load-share controllers is susceptible to interference, which means the information with regard to the currents to be set of the respective Power supplies may be faulty.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung der eingangs genannten Art zu schaffen, welche für einen Einsatz in parallel zu schaltenden Stromversorgungen geeignet ist.Of the present invention is based on the object, a circuit arrangement of the type mentioned above, which for use in parallel suitable for switching power supplies.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Maßnahmen gelöst.These The object is specified by the characterizing part of claim 1 Measures resolved.

Vorteilhaft ist, dass auf einen Einsatz von Loadshare-Controllern verzichtet werden kann. Darüber hinaus ist es möglich, DC-Stromversorgungen parallel zu schalten, deren maximalen Versorgungsströme unterschiedlich sind, wobei eine gleichmäßige prozentuale Auslastung der DC-Stromversorgungen bezogen auf deren jeweiligen maximalen Versorgungsstrom bewirkt wird.Advantageous is that can be dispensed with the use of load-share controllers. About that It is also possible DC power supplies in parallel whose maximum supply currents differ are, being a uniform percentage Utilization of the DC power supplies based on their respective maximum supply current is effected.

Die Erfindung geht von der Idee aus, die Widerstandskennlinie am Ausgang der Schaltungsanordnung elektronisch nachzubilden. Der Ausgangsstrom steigt von einem Wert 0 (Leerlaufspannung, keine Last angeschlossen) bis zu einem Maximalwert, wobei die Spannung von einem Maximalwert (Leerlaufspannung) bis zu einem Minimalwert (Volllast, maximaler Strom) abfällt. Durch diese elektronische Nachbildung wird im Vergleich zu einer Beschaltung der DC-Stromversorgungen mit in Reihe geschalteten Widerständen keine Verlustleistung erzeugt.The Invention is based on the idea, the resistance characteristic at the output imitate the circuit arrangement electronically. The output current rises from a value 0 (open circuit voltage, no load connected) up to a maximum value, the voltage being from a maximum value (Open circuit voltage) up to a minimum value (full load, maximum Current) drops. This electronic replica is compared to a Wiring of DC power supplies with resistors in series None Power loss generated.

In einer Ausgestaltung der Erfindung gemäß den im Anspruch 2 angegebenen Maßnahmen ist vorgesehen, mit einem einfachen Differenzverstärker die Widerstandskennlinie elektronisch nachzubilden.In An embodiment of the invention according to the specified in claim 2 activities is provided with a simple differential amplifier the Imitate resistance characteristic electronically.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung veranschaulicht ist, werden im Folgenden die Erfindung, deren Ausgestaltungen sowie Vorteile näher erläutert.Based the drawing in which an embodiment The invention is illustrated below, the invention, their embodiments and advantages explained in more detail.

Es zeigen:It demonstrate:

1 eine Schaltungsanordnung zur Versorgung einer Last mit einem Ausgangsstrom, 1 a circuit arrangement for supplying a load with an output current,

2 zwei parallel geschaltete Schaltungsanordnungen und 2 two parallel circuit arrangements and

3 eine Darstellung von Widerstandskennlinien. 3 a representation of resistance characteristics.

In 1 ist mit Sr ein Schaltregler bezeichnet, welcher aus einer Eingangsspannung Ue eine Ausgangsspannung Ua für eine an einem Anschlusspunkt Ap angeschlossene Last RL erzeugt. Der Schaltregler Sr ist mit einem Rückkopplungszweig Rz versehen, welcher an einem Verbindungspunkt Vp eines parallel zur Last RL geschalteten, mit Widerständen Ra, Rb versehenen Spannungsteilers angeschlossen ist. Unabhängig von einem Ausgangsstrom Ia stellt der Schaltregler Sr an diesem Rückkopplungszweig Rz eine konstante Spannung URb ein. Zur Beeinflussung dieses Rückkopplungszweiges Rz ist ein Differenzverstärker Dv vorgesehen, welcher den Ausgangsstrom Ia über einen Messwiderstand Rs erfasst. In Abhängigkeit des Ausgangsstromes Ia variiert am Ausgang Da des Differenzverstärkers Dv eine Spannung UaDv zwischen einem Wert 0 V (Ausgangsstrom Ia = 0, Leerlauf) und einem maximalen Wert (maximaler Ausgangsstrom, Volllast), wobei die Beschaltung des Differenzverstärkers Dv mit Widerständen R1, R2, R3, R4 und des Spannungsteilers mit den Widerständen Ra, Rb so dimensioniert ist, dass die Spannung UaDv am Ausgang Da des Differenzverstärkers Dv die Spannung URb am Verbindungspunkt Vp des Spannungsteilers nicht überschreitet.In 1 Sr is a switching regulator which generates an output voltage Ua from an input voltage Ue for a load RL connected to a connection point Ap. The switching regulator Sr is provided with a feedback branch Rz which is connected to a connection point Vp of a voltage divider connected in parallel to the load RL and provided with resistors Ra, Rb. Irrespective of an output current Ia, the switching regulator Sr sets a constant voltage U Rb at this feedback branch Rz. In order to influence this feedback branch Rz, a differential amplifier Dv is provided, which detects the output current Ia via a measuring resistor Rs. Depending on the output current Ia, the output Da of the differential amplifier Dv varies a voltage U aDv between a value 0 V (output current Ia = 0, open circuit) and a maximum value (maximum output current, full load), the connection of the differential amplifier Dv with resistors R1, R2, R3, R4 and the voltage divider with the resistors Ra, Rb is dimensioned such that the voltage U aDv at the output Da of the differential amplifier Dv does not exceed the voltage U Rb at the connection point Vp of the voltage divider.

In einem praktischen Ausführungsbeispiel der Erfindung ist folgende Dimensionierung vorgesehen: R1 = R3; R2 = R4; R1/R2 = R3/R4 = 1/50; Ra = Rb/2; Rf = Rb; Rs = 50 mΩ; URb = 2,5 V(1) In a practical embodiment of the invention the following dimensions are provided: R1 = R3; R2 = R4; R1 / R2 = R3 / R4 = 1/50; Ra = Rb / 2; Rf = Rb; Rs = 50mΩ; U Rb = 2.5V (1)

Im Folgenden wird angenommen, dass zunächst keine Last RL am Anschlusspunkt Ap angeschlossen ist (Leerlauf) und der Schaltregler Sr eine Ausgangsspannung von 5 V erzeugt. Die Spannung am Ausgang Da des Differenzverstärkers Dv errechnet sich zu

Figure 00040001
In the following it is assumed that initially no load RL is connected to the connection point Ap (idling) and the switching regulator Sr generates an output voltage of 5 V. The voltage at the output Da of the differential amplifier Dv is calculated to
Figure 00040001

Aufgrund der in (1) angegebenen Dimensionierung beträgt die Ausgangsspannung des Differenzverstärkers Dv

Figure 00040002
Due to the dimensioning given in (1), the output voltage of the differential amplifier is Dv
Figure 00040002

Ein zwischen dem Ausgang des Differenzverstärkers Dv und dem Schaltregler Sr angeordneter Widerstand Rf, mit Rf = Rb, liegt somit auf Massepotential, wodurch am Widerstand Ra die Spannung

Figure 00040003
abfällt.An arranged between the output of the differential amplifier Dv and the switching regulator Sr resistor Rf, where Rf = Rb, is thus at ground potential, whereby at the resistor Ra, the voltage
Figure 00040003
drops.

Es wird nun angenommen, dass eine Last am Anschlusspunkt Ap angeschlossen wird, die einen Strom von Ia = 0,5 A zieht. Aufgrund der angegebenen Dimensionierung (1), der Gleichung (2) und der Gleichung U– = U+ – Ia·Rs (3)ergibt sich demnach am Ausgang Da des Differenzverstärkers Dv eine Spannung zu UaDv = 1,25 V. It is now assumed that a load is connected at the connection point Ap, which draws a current of Ia = 0.5 A. Due to the given dimensioning (1), the equation (2) and the equation U - = U + - Ia · Rs (3) Accordingly, a voltage results at the output Da of the differential amplifier Dv U aDv = 1.25 V.

Am Verbindungspunkt Vp gilt:

Figure 00050001
At the connection point Vp:
Figure 00050001

Die Ausgangsspannung Ua bei einem Laststrom Ia = 0,5 A beträgt demnach Ua = URa + URb = 4,375 V. The output voltage Ua at a load current Ia = 0.5 A is therefore U a = U Ra + U Rb = 4.375 V.

Für den Fall, dass eine Last angeschlossen wird, die einen maximalen Ausgangsstrom Ia von beispielsweise 1 A benötigt, vermindert sich die Ausgangsspannung Ua proportional zum Ausgangsstrom Ia.In the case, that a load is connected that has a maximum output current Ia of, for example, 1 A, the output voltage Ua decreases in proportion to the output current Ia.

Aus den Gleichungen (2) und (3) errechnet sich für diesen Fall eine Spannung UaDv am Ausgang Da des Differenzverstärkers Dv UaDv = 2,5 V,was bedeutet, dass am Widerstand Ra eine Spannung

Figure 00050002
abfällt.From equations (2) and (3), a voltage U aDv at the output Da of the differential amplifier Dv is calculated for this case U aDv = 2.5V, which means that the resistor Ra is a voltage
Figure 00050002
drops.

Die Ausgangsspannung Ua = URa + URb sinkt daher bei einem maximalen Ausgangsstrom Ia von 1 A auf 3,75 V ab.The output voltage U a = U Ra + U Rb therefore decreases from 1 A to 3.75 V at a maximum output current Ia.

Es wird nun angenommen, dass eine Last RL anzuschließen ist, die einen Strom von 1,5 A benötigt, die Schaltungsanordnung gemäß 1 allerdings lediglich für einen Strom von maxi mal 1 A ausgelegt ist. In diesem Fall werden zur Versorgung dieser Last zwei derartig dimensionierte Schaltungsanordnungen DC1, DC2 parallel geschaltet (s. 2). Die in den 1 und 2 gleichen Teile sind mit gleichen Bezugszeichen versehen. Aufgrund der gleichen Dimensionierung der Schaltungsanordnungen DC1, DC2 führt jede dieser Schaltungsanordnungen DC1, DC2 der Last RL einen Strom Ia1, Ia2 von 0,75 A zu, so dass die Last RL mit einem Gesamtstrom Ia = 1,5 A versorgt wird.It is now assumed that a load RL requiring a current of 1.5 A is to be connected according to the circuit arrangement 1 However, only for a current of maxi times 1 A is designed. In this case, two such dimensioned circuit arrangements DC1, DC2 are connected in parallel to supply this load (s. 2 ). The in the 1 and 2 the same parts are provided with the same reference numerals. Due to the same dimensioning of the circuit arrangements DC1, DC2, each of these circuit arrangements DC1, DC2 supplies the load RL with a current Ia1, Ia2 of 0.75 A, so that the load RL is supplied with a total current Ia = 1.5 A.

Die Schaltungsanordnungen können selbstverständlich für unterschiedliche Maximalströme ausgelegt sein. In diesem Fall stellt sich in jeder DC-Stromversorgung ein im Wesentlichen gleicher prozentualer Anteil des jeweiligen maximalen Versorgungsstroms ein. Unterschiedliche Maximalströme der Schaltungsanordnungen DC1, DC2 können dadurch bewirkt werden, dass beispielsweise die Messwiderstände Rs der Schaltungsanordnungen DC1, DC2 unterschiedlich dimensioniert werden. Für den Fall, dass der Widerstandswert des Widerstandes Rs der Schaltungsanordnung DC1 50 mΩ und der der Schaltungsanordnung DC2 100 mΩ beträgt, versorgt – unter der in (1) vorausgesetzten Dimensionierung – die Schaltungsanordnung DC1 die Last RL mit Strom von maximal 1 A, Schaltungsanordnung DC2 mit einem Strom von maximal 0,5 A, so dass die Last RL mit einem maximalen Gesamtstrom von 1,5 A versorgt werden kann. Unterschiedliche Maximalströme der Schaltungsanordnungen DC1, DC2 können auch dadurch bewirkt werden, dass die Verstärkungsfaktoren R2/R1 der jeweiligen Differenzverstärker der Schaltungsanordnung DC1, DC2 unterschiedlich ausgelegt werden.The Circuit arrangements can Of course for different maximum currents be designed. In this case, turns in any DC power supply a substantially equal percentage of each maximum supply current. Different maximum currents of the circuit arrangements DC1, DC2 can be effected, for example, that the measuring resistors Rs the Circuit arrangements DC1, DC2 are dimensioned differently. For the Case that the resistance of the resistor Rs of the circuit DC1 50mΩ and the circuit arrangement DC2 is 100 mΩ, supplied - under the presupposed in (1) dimensioning - the circuit DC1 the load RL with current of maximum 1 A, circuit arrangement DC2 with a maximum current of 0.5A, so that the load RL with a maximum Total current of 1.5 A can be supplied. Different maximum currents of the circuit arrangements DC1, DC2 can also be effected by the gain factors R2 / R1 of the respective differential amplifier the circuit arrangement DC1, DC2 are designed differently.

Im Folgenden wird auf 3 verwiesen, in welcher der Zusammenhang zwischen den Ausgangsströmen Ia1, Ia2 und der Ausgangsspannung Ua der Schaltungsanordnungen DC1, DC2 dargestellt ist. Dabei wird angenommen, dass die Schaltungsanordnungen DC1, DC2 so dimensioniert sind, dass diese für unterschiedliche Maximalströme Ia1max, Ia2max ausgelegt sind. Bei einem Laststrom von Ia = Ia1 + Ia2 stellt sich eine „gemeinsame" Ausgangsspannung Ua ein, wobei sich eine gleich mäßige prozentuale Auslastung der Schaltungsanordnungen DC1, DC2 bezogen auf deren jeweiligen maximalen Versorgungsstrom ergibt.The following will be on 3 referenced, in which the relationship between the output currents Ia1, Ia2 and the output voltage Ua of the circuits DC1, DC2 is shown. It is assumed that the circuit arrangements DC1, DC2 are dimensioned so that they are designed for different maximum currents Ia1 max , Ia2 max . At a load current of Ia = Ia1 + Ia2 sets a "common" output voltage Ua, resulting in a uniform percentage utilization of the circuits DC1, DC2 based on their respective maximum supply current.

Es gilt:

Figure 00070001
The following applies:
Figure 00070001

Claims (3)

Schaltungsanordnung mit einem Schaltregler (Sr), welcher zur Versorgung einer Last (RL) mit einem Ausgangsstrom (Ia) vorgesehen ist, wobei – ein an einem Bezugspotential und an einem Anschlusspunkt (Ap) der Last (RL) angeschlossener Spannungsteiler (Ra, Rb) parallel zur Last (RL) geschaltet ist, – ein Rückkopplungszweig (Rz) des Schaltreglers (Sr) an einem Verbindungspunkt (Vp) des Spannungsteilers (Ra, Rb) angeschlossen ist, wobei der Schaltregler (Sr) unabhängig vom Ausgangsstrom (Ia) am Rückkopplungszweig (Rz) eine konstante Spannung (URb) einstellt, gekennzeichnet durch Mittel (Dv), welche den Rückkopplungszweig (Rz) derart beeinflussen, dass sich das Potential (URa) zwischen dem Verbindungspunkt (Vp) des Spannungsteilers (Ra, Rb) und dem Anschlusspunkt (Ap) der Last (RL) in Abhängigkeit des Ausgangsstroms (Ia) ändert.Circuit arrangement with a switching regulator (Sr) which is provided for supplying a load (RL) with an output current (Ia), wherein - a voltage divider (Ra, Rb) connected to a reference potential and to a connection point (Ap) of the load (RL) a feedback branch (Rz) of the switching regulator (Sr) is connected to a connection point (Vp) of the voltage divider (Ra, Rb), the switching regulator (Sr) being independent of the output current (Ia) at the feedback branch (Rz) sets a constant voltage (U Rb ), characterized by means (Dv) which influence the feedback branch (Rz) such that the potential (U Ra ) between the connection point (Vp) of the voltage divider (Ra, Rb) and the connection point (Ap) of the load (RL) in response to the output current (Ia) changes. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel (Dv) in Form eines Differenzverstärkers (DV) ausgebildet sind, welcher über einen Messwiderstand (Rs) den Ausgangsstrom (Ia) erfasst, wobei der Ausgang (Da) des Differenzverstärkers (Dv) über einen Widerstand (Rf) an den Verbindungspunkt (Vp) des Spannungsteilers (Ra, Rb) angeschlossen ist.Circuit arrangement according to Claim 1, characterized that the means (Dv) in the form of a differential amplifier (DV) are formed, which over a measuring resistor (Rs) detects the output current (Ia), wherein the output (Da) of the differential amplifier (Dv) via a resistor (Rf) on the connection point (Vp) of the voltage divider (Ra, Rb) connected is. DC-Stromversorgung zur Versorgung einer Last (RL) mit mindestens zwei parallel geschalteten Schaltungsanordnungen (DC1, DC2) nach Anspruch 1 oder 2.DC power supply to supply a load (RL) with at least two parallel circuits (DC1, DC2) according to claim 1 or 2.
DE200510014992 2005-04-01 2005-04-01 Switching arrangement for DC power supply, has switching controller whose feedback branch is controlled such that potential between juncture of voltage divider and connection point of load is varied based on output current Ceased DE102005014992A1 (en)

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DE200510014992 Ceased DE102005014992A1 (en) 2005-04-01 2005-04-01 Switching arrangement for DC power supply, has switching controller whose feedback branch is controlled such that potential between juncture of voltage divider and connection point of load is varied based on output current

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101841241A (en) * 2009-03-20 2010-09-22 西门子公司 Devices with DC power supply units connected in parallel
EP2249469A1 (en) 2009-05-08 2010-11-10 Siemens Aktiengesellschaft Switching assembly for supplying a load with an output current
DE102016222367A1 (en) 2016-09-13 2018-03-15 Dialog Semiconductor (Uk) Limited Multiphase DC-DC converter with asymmetrical GM

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Irving,B.T., Jovanovic,M.M.: Analysis, design, and performance evaluation of droop current-sharing method Fifteenth Annual IEEE Applied Power Elec- tronics Conference and Exposition, 6-10 Feb. 2000, Volume 1, Page(s): 235-241
Irving,B.T., Jovanovic,M.M.: Analysis, design, andperformance evaluation of droop current-sharing method Fifteenth Annual IEEE Applied Power Elec- tronics Conference and Exposition, 6-10 Feb. 2000,Volume 1, Page(s): 235-241 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101841241A (en) * 2009-03-20 2010-09-22 西门子公司 Devices with DC power supply units connected in parallel
EP2230742A1 (en) 2009-03-20 2010-09-22 Siemens Aktiengesellschaft Assembly with DC electricity supply units switch in parallel
US8237309B2 (en) 2009-03-20 2012-08-07 Siemens Ag Arrangement having parallel-connected DC power supply units
CN101841241B (en) * 2009-03-20 2013-05-01 西门子公司 Assembly with DC electricity supply units switch in parallel
EP2249469A1 (en) 2009-05-08 2010-11-10 Siemens Aktiengesellschaft Switching assembly for supplying a load with an output current
CN101882868A (en) * 2009-05-08 2010-11-10 西门子公司 Circuit arrangement for powering a load with output current
US9479057B2 (en) 2009-05-08 2016-10-25 Siemens Aktiengesellschaft Circuit arrangement for supplying an output current to a load
DE102016222367A1 (en) 2016-09-13 2018-03-15 Dialog Semiconductor (Uk) Limited Multiphase DC-DC converter with asymmetrical GM

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