EP2553797A1 - Dc-dc converter with cuk circuit and load current detection - Google Patents

Dc-dc converter with cuk circuit and load current detection

Info

Publication number
EP2553797A1
EP2553797A1 EP10712418A EP10712418A EP2553797A1 EP 2553797 A1 EP2553797 A1 EP 2553797A1 EP 10712418 A EP10712418 A EP 10712418A EP 10712418 A EP10712418 A EP 10712418A EP 2553797 A1 EP2553797 A1 EP 2553797A1
Authority
EP
European Patent Office
Prior art keywords
converter
circuit
load
measuring resistor
cuk
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP10712418A
Other languages
German (de)
French (fr)
Inventor
Volker Radtke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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 Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP2553797A1 publication Critical patent/EP2553797A1/en
Withdrawn legal-status Critical Current

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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
    • 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
    • H02M3/005—Conversion of dc power input into dc power output using Cuk converters

Definitions

  • the invention relates to a DC-DC converter with Cuk-circuit and a measuring ⁇ resistance for load current detection.
  • the ratio of a duty cycle to a turn-off duration of a controlled switch of the converter can be adjusted.
  • the choice of the ratio of duty cycle to off duration is often made in response to the load current.
  • the load current should be regulated.
  • a signal to a controller a signal to a controller.
  • a pulse width modulation (PWM) is used for the control.
  • Cuk-type DC-DC converters are described, for example, in the document "Designing a Boost-Buck (Cuk) Converter with HV9930 / AT9933", Supertex Inc.
  • Cuk-type DC-DC converters have a controlled switch and a so-called switching diode which serve to commutate the current between different branches of the circuit.
  • the output voltage of a DC-DC converter with Cuk-circuit is always negative compared to the reference potential.
  • the voltage picked up at the measuring resistor in the load circuit is therefore negative and can not easily be replaced by the common microcontact Rollers, such as the HV9930 Supertex Inc. supplied, which are adapted for a signal that has a positive voltage with respect to the reference potential.
  • the common microcontact Rollers such as the HV9930 Supertex Inc. supplied
  • the invention has for its object to improve a DC-DC converter with a Cuk-circuit so that a signal adjustment of the measuring signal by an inverter is superfluous.
  • the measuring resistor is arranged in series with the switching diode.
  • the measuring resistor is not arranged in the load circuit of the DC-DC converter but in a, upstream of the load circuit secondary circuit, which is only temporarily passed through, namely with an open controlled switch of the converter.
  • the mean value of the current arranged by the measuring resistor corresponds to the load current, which is why this indirectly indicates the load current. Since the load current of a DC-DC converter is a DC, the load current always flows through the switching diode, even if a smoothing capacitor is arranged parallel to the output of the DC-DC converter.
  • the measuring resistor can be connected with a first terminal to a cathode of the switching diode and with a second terminal to a reference potential of the DC converter. Parallel to the measuring resistor, a capacitor may be arranged. This capacitor can serve the averaging.
  • the first terminal of the measuring resistor can be connected to an input of an integrated circuit, in particular an operational amplifier or a microcontroller.
  • the first connection of the measuring resistor may be connected to an integrator circuit.
  • the integrator circuit may be part of the microcontroller.
  • An output of the integrator circuit may be connected to an input of a means for generating a PWM signal whose output is connected to a controlled switching element of the Cuk circuit.
  • the means for generating a PWM signal may also be part of the microcontroller.
  • DC converter and a load may be configured so that the load is connected on the one hand to an output of the DC adjuster and on the other hand to the reference potential of the DC adjuster.
  • the load can also be connected on the one hand to an output of the DC adjuster and on the other hand to a positive input-side potential of the DC adjuster.
  • a filter in particular a passive filter can be arranged.
  • FIG. 1 shows a circuit arrangement according to the invention from a DC converter according to the invention and a load only with representation of the power paths
  • Fig. 2 shows the circuit arrangement of FIG. 1, however, in the representation of a shading for controlling the DC-DC converter and
  • Fig. 3 shows an extension of the circuit arrangement according to FIG. 2 for an optional connection of the load
  • the inventive DC-DC converter W shown in Figures 1 to 3 has an input which is connected to a DC voltage source UB. To the output of the converter W, a load RL is connected, which is shown as an ohmic load.
  • the converter W has parallel to the input to a first capacitor Cp, which serves to smooth the input voltage.
  • This first capacitor can be omitted.
  • a first inductor L1 is connected to the input.
  • the throttle is connected with its the input of the converter W remote terminal via a transistor T1 as a controlled switch to the reference potential.
  • the first throttle is connected to a second capacitor Ck.
  • the second capacitor Ck With its connection facing away from the inductor L1, the second capacitor Ck is connected to the output of the converter W via a second inductor L2. In addition, this terminal of the second capacitor Ck is connected to the anode of a diode D1, hereinafter referred to as a switching diode. Parallel to the output of the converter W, a third capacitor Cs is arranged.
  • the transducer W corresponds to a converter known from the prior art.
  • a prior art converter would have in series with the output a sense resistor across which a voltage equivalent to the load current would drop.
  • the transducer W according to the invention has a measuring resistor elsewhere, namely in series with the switching diode D1, between the cathode of the switching diode and the reference potential.
  • the load current IL flows via this measuring resistor Rs.
  • a current flows, which corresponds to the load current IL in the time average. Therefore, after simple averaging, the voltage across the sense resistor can be used as a signal to the load current.
  • the averaging can take place in a first step through a capacitor Ca, which is connected in parallel to the measuring resistor Rs.
  • the voltage across the parallel circuit of the measuring resistor and the capacitor Ca can be supplied for a more accurate averaging of an integrator circuit.
  • the cathode of the switching diode D1 can do this via a resistor R1 a inverting input of an operational amplifier OP, as shown in Figs. 2 and 3.
  • a reference voltage is then connected via a further resistor R2.
  • the output error of the operational amplifier OP is, as usual with integrator circuits, fed back via a capacitor Cint to the inverting input of the operational amplifier.
  • the output error is connected to the input of a regulator PWM, which generates a pulse width modulated signal for driving the transistor T1 and whose output is connected to the gate g of the transistor.
  • the circuit arrangement shown in Figure 3 corresponds to the circuit arrangement shown in Figure 2, wherein the circuit arrangement shown in Figure 2 is supplemented by a switch U in series with the load RL and a connection from the switch U to the input of the converter W.
  • the changeover switch it is possible to change between a so-called economy topology and a circuit arrangement shown in FIG. 2, without a change in the detection of the load current having to take place.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention relates to a DC-DC converter (W) with a Cuk circuit and a measuring resistor (Rs) for load current detection (IL), wherein the Cuk circuit has a switching diode (D1), wherein the measuring resistor (Rs) is arranged in series with the switching diode (D1).

Description

Gleichstromwandler mit Cuk-Schaltung und Laststromerfassung  DC-DC converter with Cuk-circuit and load current detection
Beschreibung description
Die Erfindung betrifft einen Gleichstromwandler mit Cuk-Schaltung und einem Mess¬ widerstand zur Laststromerfassung. The invention relates to a DC-DC converter with Cuk-circuit and a measuring ¬ resistance for load current detection.
Aus dem Stand der Technik sind neben Tiefsetzwandlern, Hochsetzwandlern und Sperrwandlern auch Wandler mit Cuk-Schaltung zum Wandeln von Gleichstrom bzw. Gleichspannung in einen Gleichstrom bzw. eine Gleichspannung mit einem anderen Betrag bekannt. Mit Sperrwandlern und Wandlern mit Cuk-Schaltung können Eingangsspannungen der Wandler sowohl herauf- als auch herabgesetzt werden. In addition to Tiefsetzwandlern, Hochsetzwandlern and flyback converters and converters with Cuk circuit for converting DC or DC voltage into a DC or a DC voltage with a different amount are known from the prior art. With flyback converters and Cuk-switched converters, the input voltages of the converters can be both increased and decreased.
Zum Regeln der Ausgangsgröße eines Wandlers mit Cuk-Schaltung kann, wie auch bei anderen bekannten Gleichstromwandlern, das Verhältnis von einer Einschaltdauer zu einer Ausschaltdauer eines gesteuerten Schalters des Wandlers eingestellt werden. Die Wahl des Verhältnisses von Einschaltdauer zur Ausschaltdauer wird häufig in Abhängigkeit des Laststroms getroffen. Häufig soll der Laststrom geregelt werden. Zum Regeln des Laststroms bei Wandlern mit Cuk-Schaltung wird nach dem Stand der Technik über einen Messwiderstand im Lastkreis ein Signal an einen Regler gegeben. Häufig wird zur Regelung eine Pulsweitenmodulation (PWM) genutzt. For controlling the output of a Cuk-connected converter, as with other known DC-DC converters, the ratio of a duty cycle to a turn-off duration of a controlled switch of the converter can be adjusted. The choice of the ratio of duty cycle to off duration is often made in response to the load current. Often the load current should be regulated. To regulate the load current in converters with Cuk-circuit is given according to the prior art via a measuring resistor in the load circuit, a signal to a controller. Frequently, a pulse width modulation (PWM) is used for the control.
Beispiele für Gleichstromwandler mit Cuk-Schaltung sind zum Beispiel in dem Dokument„Designing a Boost-Buck (Cuk) Converter with HV9930/AT9933", Supertex Inc. beschrieben. Examples of Cuk-type DC-DC converters are described, for example, in the document "Designing a Boost-Buck (Cuk) Converter with HV9930 / AT9933", Supertex Inc.
Gleichstromwandler mit Cuk-Schaltung weisen einen gesteuerten Schalter und eine sogenannte Schaltdiode auf, die der Kommutierung des Stroms zwischen verschiedenen Zweigen der Schaltung dienen. Cuk-type DC-DC converters have a controlled switch and a so-called switching diode which serve to commutate the current between different branches of the circuit.
Die Ausgangspannung eines Gleichstromwandlers mit Cuk-Schaltung ist immer negativ gegenüber dem Bezugspotential. Die am Messwiderstand im Lastkreis abgegriffene Spannung ist daher negativ und kann nicht ohne weiteres den gängigen Mikrocont- rollern, wie zum Beispiel dem HV9930 der Supertex Inc. zugeführt werden, die für ein Signal angepasst sind, das bezüglich dem Bezugspotential eine positive Spannung hat. Derzeit ist daher eine Signalanpassung, zum Beispiel mit Invertern notwendig. The output voltage of a DC-DC converter with Cuk-circuit is always negative compared to the reference potential. The voltage picked up at the measuring resistor in the load circuit is therefore negative and can not easily be replaced by the common microcontact Rollers, such as the HV9930 Supertex Inc. supplied, which are adapted for a signal that has a positive voltage with respect to the reference potential. Currently, therefore, a signal adaptation, for example, with inverters necessary.
Eine Inverterstufe erhöht aber den Schaltungsaufwand und die Toleranzen. However, an inverter stage increases the circuit complexity and the tolerances.
Hier setzt die vorliegende Erfindung an. This is where the present invention begins.
Der Erfindung liegt die Aufgabe zugrunde einen Gleichstromwandler mit einer Cuk- Schaltung so zu verbessern, dass eine Signalanpassung des Messsignals durch einen Inverter überflüssig ist. The invention has for its object to improve a DC-DC converter with a Cuk-circuit so that a signal adjustment of the measuring signal by an inverter is superfluous.
Diese Aufgabe wird dadurch gelöst, dass der Messwiderstand in Reihe zur Schaltdiode angeordnet ist. This object is achieved in that the measuring resistor is arranged in series with the switching diode.
Im Unterschied zum Stand der Technik ist der Messwiderstand nicht im Lastkreis des Gleichstromwandlers angeordnet sondern in einem, dem Lastkreis vorgeschalteten Sekundärkreis, der nur zeitweise, nämlich bei geöffnetem gesteuertem Schalter des Wandlers stromdurchflossen ist. Der Mittelwert des durch den Messwiderstand angeordneten Stromes entspricht allerdings dem Laststrom, weshalb dieser mittelbar den Laststrom angibt. Da der Laststrom eines Gleichstromwandlers ein Gleichstrom ist, fließt der Laststrom auch dann immer durch die Schaltdiode, auch wenn parallel zum Ausgang des Gleichstromwandlers ein Glättungskondensator angeordnet ist. In contrast to the prior art, the measuring resistor is not arranged in the load circuit of the DC-DC converter but in a, upstream of the load circuit secondary circuit, which is only temporarily passed through, namely with an open controlled switch of the converter. However, the mean value of the current arranged by the measuring resistor corresponds to the load current, which is why this indirectly indicates the load current. Since the load current of a DC-DC converter is a DC, the load current always flows through the switching diode, even if a smoothing capacitor is arranged parallel to the output of the DC-DC converter.
Der Messwiderstand kann mit einem ersten Anschluss mit einer Kathode der Schaltdiode und mit einem zweiten Anschluss mit einem Bezugspotential des Gleichstromwandlers verbunden sein. Parallel zum Messwiderstand kann ein Kondensator angeordnet sein. Dieser Kondensator kann der Mittelwertbildung dienen. The measuring resistor can be connected with a first terminal to a cathode of the switching diode and with a second terminal to a reference potential of the DC converter. Parallel to the measuring resistor, a capacitor may be arranged. This capacitor can serve the averaging.
Der erste Anschluss des Messwiderstandes kann erfindungsgemäß mit einem Eingang eines integrierten Schaltkreises, insbesondere eines Operationsverstärkers oder eines Mikrocontrollers verbunden sein. Der erste Anschluss des Messwiderstandes kann mit einer Integratorschaltung verbunden sein. Die Integratorschaltung kann Teil des Mikrocontrollers sein. According to the invention, the first terminal of the measuring resistor can be connected to an input of an integrated circuit, in particular an operational amplifier or a microcontroller. The first connection of the measuring resistor may be connected to an integrator circuit. The integrator circuit may be part of the microcontroller.
Ein Ausgang der Integratorschaltung kann mit einem Eingang eines Mittels zum Erzeugen eines PWM-Signals verbunden sein, dessen Ausgang mit einem gesteuerten Schaltelement der Cuk-Schaltung verbunden ist. Auch das Mittel zum Erzeugen eines PWM-Signals kann Teil des Mikrocontrollers sein. An output of the integrator circuit may be connected to an input of a means for generating a PWM signal whose output is connected to a controlled switching element of the Cuk circuit. The means for generating a PWM signal may also be part of the microcontroller.
Eine erfindungsgemäße Schaltungsanordnung aus einem erfindungsgemäßen A circuit arrangement according to the invention of an inventive
Gleichstromwandler und einer Last, kann so ausgestaltet sein, dass die Last einerseits an einen Ausgang des Gleichstromstellers und andererseits an das Bezugspotential des Gleichstromstellers angeschlossen ist. DC converter and a load may be configured so that the load is connected on the one hand to an output of the DC adjuster and on the other hand to the reference potential of the DC adjuster.
Die Last kann aber auch einerseits an einen Ausgang des Gleichstromstellers und andererseits an ein positives eingangseitiges Potential des Gleichstromstellers angeschlossen sein. The load can also be connected on the one hand to an output of the DC adjuster and on the other hand to a positive input-side potential of the DC adjuster.
Zwischen dem Ausgang und der Last kann ein Filter, insbesondere ein passives Filter angeordnet sein. Between the output and the load, a filter, in particular a passive filter can be arranged.
Anhand der beigefügten Zeichnungen wird die Erfindung nachfolgend näher erläutert. Dabei zeigt: Reference to the accompanying drawings, the invention is explained in more detail below. Showing:
Fig. 1 eine erfindungsgemäße Schaltungsanordnung aus einem erfindungsgemäßen Gleichstromwandler und einer Last nur mit Darstellung der Leistungspfade, 1 shows a circuit arrangement according to the invention from a DC converter according to the invention and a load only with representation of the power paths,
Fig. 2 die Schaltungsanordnung gemäß Fig. 1 jedoch bei Darstellung einer Beschattung zum Regeln des Gleichstromwandlers und  Fig. 2 shows the circuit arrangement of FIG. 1, however, in the representation of a shading for controlling the DC-DC converter and
Fig. 3 eine Erweiterung der Schaltungsanordnung gemäß Fig. 2 für einen optionalen Anschluss der Last  Fig. 3 shows an extension of the circuit arrangement according to FIG. 2 for an optional connection of the load
Der in den Figuren 1 bis 3 dargestellte erfindungsgemäße Gleichstromwandler W weist einen Eingang auf, der an einen Gleichspannungsquelle UB angeschlossen ist. An den Ausgang des Wandlers W ist eine Last RL angeschlossen, die als ohmsche Last dargestellt ist. The inventive DC-DC converter W shown in Figures 1 to 3 has an input which is connected to a DC voltage source UB. To the output of the converter W, a load RL is connected, which is shown as an ohmic load.
Der Wandler W weist parallel zum Eingang einen ersten Kondensator Cp auf, der zur Glättung der Eingangspannung dient. Dieser erste Kondensator kann entfallen. The converter W has parallel to the input to a first capacitor Cp, which serves to smooth the input voltage. This first capacitor can be omitted.
Innerhalb des Wandlers W ist an den Eingang eine erste Drossel L1 angeschlossen. Die Drossel ist mit ihrem dem Eingang des Wandlers W abgewandten Anschluss über einen Transistor T1 als gesteuertem Schalter mit dem Bezugspotential verbunden. Mit dem gleichen Anschluss ist die erste Drossel mit einem zweiten Kondensator Ck verbunden. Within the converter W, a first inductor L1 is connected to the input. The throttle is connected with its the input of the converter W remote terminal via a transistor T1 as a controlled switch to the reference potential. With the same connection, the first throttle is connected to a second capacitor Ck.
Mit seinem von der Drossel L1 abgewandeten Anschluss ist der zweite Kondensator Ck über eine zweite Drossel L2 mit dem Ausgang des Wandlers W verbunden. Außerdem ist dieser Anschluss des zweiten Kondensators Ck mit der Anode einer Diode D1 , die nachstehend als Schaltdiode bezeichnet wird, verbunden. Parallel zum Ausgang des Wandlers W ist ein dritter Kondensator Cs angeordnet. With its connection facing away from the inductor L1, the second capacitor Ck is connected to the output of the converter W via a second inductor L2. In addition, this terminal of the second capacitor Ck is connected to the anode of a diode D1, hereinafter referred to as a switching diode. Parallel to the output of the converter W, a third capacitor Cs is arranged.
In soweit entspricht der Wandler W einem aus dem Stand der Technik bekannten Wandler. Ein Wandler gemäß dem Stand der Technik hätte allerdings in Reihe zum Ausgang einen Messwiderstand, über dem eine dem Laststrom äquivalente Spannung abfiele. Der erfindungsgemäße Wandler W weist einen Messwiderstand an anderer Stelle auf, nämlich in Reihe zu der Schaltdiode D1 , zwischen der Kathode der Schaltdiode und dem Bezugspotential. Über diesen Messwiderstand Rs fließt zwar nicht der Laststrom IL. Es fließt allerdings ein Strom, der im zeitlichen Mittel dem Laststrom IL entspricht. Daher kann nach einfacher Mittelwertbildung die über dem Messwiderstand abfallende Spannung als Signal für den Laststrom verwendet werden. In that regard, the transducer W corresponds to a converter known from the prior art. However, a prior art converter would have in series with the output a sense resistor across which a voltage equivalent to the load current would drop. The transducer W according to the invention has a measuring resistor elsewhere, namely in series with the switching diode D1, between the cathode of the switching diode and the reference potential. Although not the load current IL flows via this measuring resistor Rs. However, a current flows, which corresponds to the load current IL in the time average. Therefore, after simple averaging, the voltage across the sense resistor can be used as a signal to the load current.
Die Mittelwertbildung (siehe Fig. 2 und 3) kann in einem ersten Schritt durch einen Kondensator Ca erfolgen, der parallel zum Messwiderstand Rs geschaltet ist. Die Spannung über der Parallelschaltung aus dem Messwiderstand und dem Kondensator Ca kann für eine genauere Mittelwertbildung einer Integratorschaltung zugeführt werden. Die Kathode der Schaltdiode D1 kann dazu über einen Widerstand R1 einem invertierenden Eingang eines Operationsverstärkers OP zugeführt werden, wie es in Fig. 2 und 3 dargestellt ist. Am nicht invertierenden Eingang des Operationsverstärkers OP ist dann über einen weiteren Widerstand R2 eine Referenzspannung angeschlossen. Der Ausgang error des Operationsverstärkers OP ist, wie bei Integratorschaltungen üblich, über einen Kondensator Cint zum invertierenden Eingang des Operationsverstärkers zurückgeführt. Außerdem ist der Ausgang error mit dem Eingang eines Reglers PWM verbunden, der ein Pulsweitenmoduliertes Signal zum Ansteuern des Transistors T1 erzeugt und dessen Ausgang mit dem Gate g des Transistors verbunden ist. The averaging (see FIGS. 2 and 3) can take place in a first step through a capacitor Ca, which is connected in parallel to the measuring resistor Rs. The voltage across the parallel circuit of the measuring resistor and the capacitor Ca can be supplied for a more accurate averaging of an integrator circuit. The cathode of the switching diode D1 can do this via a resistor R1 a inverting input of an operational amplifier OP, as shown in Figs. 2 and 3. At the non-inverting input of the operational amplifier OP, a reference voltage is then connected via a further resistor R2. The output error of the operational amplifier OP is, as usual with integrator circuits, fed back via a capacitor Cint to the inverting input of the operational amplifier. In addition, the output error is connected to the input of a regulator PWM, which generates a pulse width modulated signal for driving the transistor T1 and whose output is connected to the gate g of the transistor.
Die in Figur 3 dargestellte Schaltungsanordnung entspricht der in Figur 2 dargestellten Schaltungsanordnung, wobei die in Figur 2 dargestellte Schaltungsanordnung um einen Umschalter U in Reihe zur Last RL und eine Verbindung vom Umschalter U zum Eingang des Wandlers W ergänzt ist. Mittels des Umschalters ist es möglich zwischen einer so genannten Spartopologie und einer in Figur 2 dargestellten Schaltungsanordnung zu wechseln, ohne dass eine Änderung bei der Erfassung des Laststroms erfolgen muss. The circuit arrangement shown in Figure 3 corresponds to the circuit arrangement shown in Figure 2, wherein the circuit arrangement shown in Figure 2 is supplemented by a switch U in series with the load RL and a connection from the switch U to the input of the converter W. By means of the changeover switch, it is possible to change between a so-called economy topology and a circuit arrangement shown in FIG. 2, without a change in the detection of the load current having to take place.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
W Gleichstromwandler W DC-DC converter
UB Gleichspannungsquelle  UB DC voltage source
Ca Kondensator Ca capacitor
Cp erster Kondensator  Cp first capacitor
Ck zweiter Kondensator Ck second capacitor
Cs dritter Kondensator Cs third capacitor
Cint Kondensator des Integrators  Cint capacitor of the integrator
L1 erste Drossel L1 first throttle
L2 zweite Drossel  L2 second throttle
T1 Transistor T1 transistor
D1 Schaltdiode  D1 switching diode
RL Last am Ausgang RL load at the output
IL Laststrom  IL load current
R1 Widerstand R1 resistance
RS Messwiderstand  RS measuring resistor
OP OperationsverstärkerOP operational amplifier
U Umschalter U switch
PWM Regler  PWM controller

Claims

Gleichstromwandler mit Cuk-Schaltung und Laststromerfassung Patentansprüche DC-DC converter with Cuk-circuit and load current detection Patent claims
1. Gleichstromwandler (W) mit Cuk-Schaltung und einem Messwiderstand (Rs) zur Laststromerfassung, wobei die Cuk-Schaltung eine Schaltdiode (D1 ) aufweist, 1. DC converter (W) with Cuk-circuit and a measuring resistor (Rs) for load current detection, wherein the Cuk-circuit has a switching diode (D1),
dadurch gekennzeichnet, dass  characterized in that
der Messwiderstand (Rs) in Reihe zur Schaltdiode (D1 ) angeordnet ist.  the measuring resistor (Rs) is arranged in series with the switching diode (D1).
2. Gleichstromwandler (W) nach Anspruch 1 , dadurch gekennzeichnet, dass der Messwiderstand (Rs) mit einem ersten Anschluss mit einer Kathode der Schaltdiode (D1 ) und mit einem zweiten Anschluss mit einem Bezugspotential des Gleichstromwandlers (W) verbunden ist. 2. DC converter (W) according to claim 1, characterized in that the measuring resistor (Rs) is connected to a first terminal to a cathode of the switching diode (D1) and to a second terminal to a reference potential of the DC-DC converter (W).
3. Gleichstromwandler (W) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass parallel zum Messwiderstand (Rs) ein Kondensator (Ca) angeordnet ist. 3. DC converter (W) according to claim 1 or 2, characterized in that parallel to the measuring resistor (Rs), a capacitor (Ca) is arranged.
4. Gleichstromwandler (W) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der erste Anschluss des Messwiderstandes (Rs) mit einem Eingang eines integrierten Schaltkreises, insbesondere eines Operationsverstärkers (OP) oder eines Mikrocontrollers verbunden ist. 4. DC converter (W) according to one of claims 1 to 3, characterized in that the first terminal of the measuring resistor (Rs) is connected to an input of an integrated circuit, in particular an operational amplifier (OP) or a microcontroller.
5. Gleichstromwandler (W) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der erste Anschluss des Messwiderstandes (Rs) mit einer Integratorschaltung verbunden ist. 5. DC-DC converter (W) according to one of claims 1 to 4, characterized in that the first terminal of the measuring resistor (Rs) is connected to an integrator circuit.
6. Gleichstromwandler (W) nach Anspruch 5, dadurch gekennzeichnet, dass ein Ausgang des Integrators mit einem Eingang eines Mittels (PWM) zum Erzeugen eines PWM-Signals verbunden ist, dessen Ausgang mit einem gesteuerten Schaltelement (T1 ) der Cuk-Schaltung verbunden ist. 6. DC converter (W) according to claim 5, characterized in that an output of the integrator is connected to an input of a means (PWM) for generating a PWM signal whose output is connected to a controlled switching element (T1) of the Cuk-circuit ,
7. Schaltungsanordnung aus einem Gleichstromwandler (W) nach einem der Ansprüche 1 bis 6 und einer Last (RL), dadurch gekennzeichnet, dass die Last (RL) einerseits an einen Ausgang des Gleichstromwandlers (W) und andererseits an das Bezugspotential des Gleichstromwandlers (W) angeschlossen ist. 7. Circuit arrangement of a DC converter (W) according to one of Claims 1 to 6 and a load (RL), characterized in that the load (RL) is connected on the one hand to an output of the DC-DC converter (W) and on the other hand to the reference potential of the DC-DC converter (W).
8. Schaltungsanordnung aus einem Gleichstromwandler (W) nach einem der 8. Circuit arrangement of a DC converter (W) according to one of
Ansprüche 1 bis 6 und einer Last (RL), dadurch gekennzeichnet, dass die Last (RL) einerseits an einen Ausgang des Gleichstromwandlers (W) und andererseits an ein positives eingangsseitiges Potential des Gleichstromwandlers (W) angeschlossen ist.  Claims 1 to 6 and a load (RL), characterized in that the load (RL) is connected on the one hand to an output of the DC-DC converter (W) and on the other hand to a positive input side potential of the DC-DC converter (W).
9. Schaltungsanordnung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass zwischen dem Ausgang und der Last (RL) ein Filter, insbesondere ein passives Filter angeordnet ist. 9. Circuit arrangement according to claim 7 or 8, characterized in that between the output and the load (RL) a filter, in particular a passive filter is arranged.
EP10712418A 2010-03-31 2010-03-31 Dc-dc converter with cuk circuit and load current detection Withdrawn EP2553797A1 (en)

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