DE102013005808B4 - DC converter - Google Patents

DC converter

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Publication number
DE102013005808B4
DE102013005808B4 DE102013005808.2A DE102013005808A DE102013005808B4 DE 102013005808 B4 DE102013005808 B4 DE 102013005808B4 DE 102013005808 A DE102013005808 A DE 102013005808A DE 102013005808 B4 DE102013005808 B4 DE 102013005808B4
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dc
connected
in2
in1
inputs
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DE102013005808A1 (en
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Götz-Martin Bertelsmann
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SEW Eurodrive GmbH and Co KG
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SEW Eurodrive GmbH and Co KG
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M2001/0077Plural converter units whose outputs are connected in series

Abstract

DC-DC converter, having two or more inputs (IN1, IN2), to each of which at least one DC voltage source (S1, S2) can be connected, and a common output (OUT) for providing a DC voltage, wherein the two or more inputs (IN1, IN2) are connected in series via at least one throttle (L1); each input (IN1, IN2) is connected to at least one switching element (SW1, SW2) in its negative branch and / or in its positive branch; and the switching elements (SW1, SW2) connected to the different inputs (IN1, IN2) are independently controllable, characterized in that the common output (OUT) is connected in series with at least two further capacitors (C3, C4); and a center tap of the at least two further capacitors (C3, C4) is connected via at least one further switching element (SW3) to one end of the inductor (L1) and connected via at least one further switching element (SW4) to another end of the inductor (L1) is, with the other switching elements (SW3, SW4) are controlled alternately, so that they are closed at any time simultaneously.

Description

  • The present invention relates to a DC-DC converter with two or more inputs, in particular for an inverter circuit.
  • DC-DC converters (boost converter, buck converter) are very often used in power supplies of various kinds. As with all power electronic assemblies, it is a goal to achieve the highest possible efficiency at the lowest possible cost.
  • An inverter usually requires an intermediate circuit voltage of a certain height to generate an alternating voltage. An optimal efficiency is usually achieved when the DC link voltage is adjusted exactly to the AC voltage to be generated.
  • Depending on the incidence of light, the temperature and the number of interconnected modules, solar generators generally deliver a strongly fluctuating DC voltage. The wider the range of DC input voltage that an inverter can process, the more possibilities of matching module combinations are available. To adapt the solar generator to the inverter, therefore, a step-up converter is often used which boosts the variable DC voltage to a relatively constant DC link voltage.
  • The basic form of a conventional boost converter (cf. 1 of the DE 10 2011 011 329 A1 ) has an input and an output. A feeding source supplies a DC voltage which can be tapped as an input voltage at the input of the boost converter. This input voltage is set high with the boost converter (consisting in particular of a throttle, a switching element and a rectifying element) to a higher output voltage, which is provided at the output of the boost converter.
  • The switching element is periodically switched on and off, wherein the clock ratio is selected via control electronics so that sets a desired output voltage or a desired output current. Capacitors connected in parallel with the input and / or output of the boost converter serve to buffer ripple currents.
  • To increase the efficiency suggests the DE 10 2008 050 402 A1 a boost converter with multiple input, which is fed from two DC voltage sources simultaneously, which are connected via the common boost converter that they are connected in parallel with the output when the switching element is closed in series and with open switching element via freewheeling diodes. The duty cycle of the switching element is chosen so that set the desired voltages or currents at the output. The energy that must be stored in the chokes, or the circulating reactive power is much smaller compared to the basic form of the boost converter described above. As a result, the size of the chokes and their losses are significantly reduced.
  • A further development of this conventional boost converter with multiple input is in the DE 10 2010 006 124 A1 disclosed. This conventional boost converter has two series-connected switching elements connected between the two inputs and connected to a potential approximately halfway between the potentials of the output, thereby reducing the voltage swings at each of the two switching elements.
  • Another development of this conventional multi-input boost converter is in the DE 10 2011 011 329 A1 disclosed. By at least two chokes are connected in parallel via switching elements in a series connection of the inputs, the current can be divided between the chokes, which is why smaller chokes can be used.
  • Further, the DE 10 2011 018 355 A1 a DC-DC converter having two DC voltage inputs and a DC output, wherein the DC voltage inputs are connected in series via a throttle and each DC voltage input is connected to at least one switching element in its negative or positive branch.
  • In the aforementioned conventional DC-DC converters, a good efficiency is achieved in particular when the currents and voltages of the DC voltage sources connected to the plurality of inputs are more or less the same.
  • The invention has for its object to provide an improved DC-DC converter with multiple input, which can achieve good efficiency even with different input currents and / or voltages.
  • This object is achieved by a DC-DC converter having the features of claim 1. Particularly preferred embodiments and further developments of the invention are the subject of the dependent claims.
  • The DC-DC converter according to the invention has two or more inputs which in each case at least one DC voltage source can be connected, and a common output for providing a DC voltage. The two or more inputs are connected in series via at least one throttle; each input is connected to at least one switching element in its negative branch and / or in its positive branch; and the switching elements connected to the various inputs are independently controllable.
  • In addition, a series connection of at least two further capacitors is connected in parallel to the common output and a center tap of the at least two further capacitors is connected via at least one further switching element to one end of the (at least one) inductor and via at least one further switching element to another end of the ( at least one) throttle connected, the other switching elements are driven alternately so that they are closed at any time simultaneously. The at least two further capacitors are preferably dimensioned essentially symmetrically and thus form a capacitor half-bridge.
  • With the thus constructed DC-DC converter of the invention can be in the case of DC voltage sources with different currents and / or voltages achieve good efficiency by the individual DC voltage sources - in particular depending on their current and voltage values - independently switched on and off. Compared to conventional DC-DC converters, greater flexibility in the application possibilities for the DC-DC converter can be achieved. The DC-DC converter according to the invention also requires only a small number of components, in particular of chokes and switching elements, which leads to a reduction of component and assembly costs.
  • By connecting the center tap of the capacitor half-bridge at the output of the DC-DC converter to one or the other end of the at least one throttle, on the one hand a voltage swing at the throttle can be reduced and / or the output or its capacitor half-bridge can be balanced. Reducing the voltage swing across the inductor can in turn reduce the switching losses per translated power in the switching elements, since the freewheeling does not occur against the higher potential of the output, which can increase the efficiency. In addition, construction volume, weight and cost of components and cooling can be significantly reduced.
  • The DC-DC converter has a plurality, d. H. two, three, four or more inputs. At each of these inputs, at least one, i. H. one, two, three or more, connected in series or parallel DC voltage sources. In this context, a "DC voltage source" is to be understood as any type of device or circuit which provides a DC voltage. DC sources in this sense include, but are not limited to, solar generators, fuel cells, thermoelectric generators, batteries, supercapacitors, electromagnetic generators, AC / DC converters, DC / DC converters, and the like.
  • The two or more inputs are connected in series via at least one throttle. Ie. two inputs each are connected in series with at least one throttle. Preferably, the plurality of inputs are each connected in series with exactly one throttle. Optionally, two or more chokes connected in parallel or in series may be connected in series between the inputs. In this context, the series connection of the multiple inputs should be considered as a series circuit with closed switching elements, i. H. switched inputs are understood.
  • At least one switching element is arranged in a positive branch and / or in a negative branch of each input. Preferably, exactly one switching element is arranged in a positive branch or a negative branch of each input. In this context, the positive branch is to be understood as the line connection connected to the positive input terminal (positive pole), to which a positive pole of a DC voltage source can be connected; In this context, the negative branch is to be understood as the line connection connected to the negative input terminal (negative pole), to which a negative pole of a DC voltage source can be connected.
  • In this context, a switching element is to be understood as any type of device or electronic component which is suitable for optionally closing or disconnecting an electrical connection. The switching elements are preferably semiconductor switching elements or power semiconductor switches, preferably MOSFETs, IGBTs, JFETs, HEMTs, cascode circuits and the like.
  • The switching elements are preferably controlled by control electronics. The control electronics are preferably constructed analog, digital or as a mixed digital-analog controller. The Switching elements are preferably controlled periodically, wherein the duty cycles are selected so that adjusts a (e) desired current or voltage at the input and / or output of the DC-DC converter. The timing of the switching elements is preferably carried out by means of pulse width modulation with a fixed or variable frequency. The flow in the throttle can be regulated to a continuous or a lopsided course.
  • The switching elements assigned to the various inputs can be controlled independently of one another according to the invention. Preferably, each switching element of the DC-DC converter can be controlled independently of all other switching elements, which are assigned to an input, preferably independent of their operating states, duty cycles and / or Tastfrequenzen. The control of the switching elements is preferably carried out dynamically or statically.
  • In a preferred embodiment of the invention, the switching elements connected to the various inputs are clocked synchronized with each other. Ie. the switching elements are each switched on synchronously at a common time, but optionally switched off at a common time or at different times.
  • In a preferred embodiment of the invention, the switching elements connected to the various inputs with mutually different duty cycles can be controlled. Preferably, the switching elements associated with a lower power input (i.e., lower power and / or lower voltage) are operated at lower duty cycles (i.e., shorter turn-on times)
  • In a preferred embodiment of the invention, at least one passive or active rectifying element is connected in parallel to each of the inputs. The rectifier elements connected in parallel to the inputs each form a freewheeling path for the open operating state of the switching element assigned to the respective input. The rectifying elements preferably have semiconductor diodes and / or synchronous rectifiers. In the former case, the circuit functionality is reduced to a pure boost converter. If the rectifying elements are designed as synchronous rectifiers, a reverse energy flow through the DC-DC converter is also possible. An application example is for example the charging and discharging of accumulators.
  • In a preferred embodiment of the invention, the negative or positive branch of an input, in which the at least one switching element is arranged, is connected via at least one further rectifying element to a negative terminal of the output (negative pole) or positive terminal of the output (positive pole). The further rectifying element preferably has at least one semiconductor diode and / or one synchronous rectifier, preferably with a very low forward voltage. The rectifying element connecting the positive / negative branch of the input to the positive / negative terminal of the output forms a bypass path through which the output can be supplied directly from this input. This is particularly advantageous if the DC voltage source connected to this input provides a voltage / current whose height reaches or exceeds a value that is to be provided by the DC-DC converter at its output.
  • Preferably, the negative or positive branch of the input, in which the at least one switching element is arranged, connected via a series circuit of at least one further rectifying element and at least one further switching element to the negative or positive terminal of the output. With the help of this further switching element in series with the rectifying element of the bypass path can be flexibly switched on and off. The further switching element is preferably a semiconductor switching element, such as a MOSFET, an IGBT, a JFET, a HEMT, a cascode circuits or the like, which is preferably controlled by control electronics.
  • In a preferred embodiment of the invention, a negative pole of one of the inputs is connected to a negative pole of the output and a positive pole of another of the inputs is connected to a positive pole of the output. With this configuration, radio interference can be reduced because the inputs have no potential jumps with respect to the output.
  • In a preferred embodiment of the invention, at least one capacitor is connected in parallel to each of the inputs. These capacitors serve as buffer capacitors, in particular for buffering ripple currents.
  • In a preferred embodiment of the invention, at least one further capacitor is connected in parallel with the common output. This further capacitor serves as a buffer capacitor, in particular for buffering ripple currents. The at least one further capacitor preferably forms an intermediate circuit for a component connected to the output (DC electrical consumer, DC network, electronic device such as inverters).
  • Preferably, the center tap of the at least two further capacitors is connected via a series circuit of the at least one further switching element and a further rectifying element to one end of the inductor and / or via a series circuit of the at least one further switching element and a still further rectifying element with the other End of the throttle connected. In this case, the series connection of the further switching element and the further rectifying element can preferably also be an integral part of a component such as, for example, a reverse-blocking IGBT.
  • The further switching elements are preferably semiconductor switching elements or power semiconductor switches, preferably MOSFETs, IGBTs, JFETs, HEMTs, cascode circuits and the like. The still further rectifying elements preferably have semiconductor diodes and / or synchronous rectifiers.
  • The (further) switching elements of the DC-DC converter are preferably connected in parallel with antiparallel freewheeling diodes (internal or external).
  • In addition, measures or means for the currentless and / or de-energized switching of the (further) switching elements of the DC-DC converter are preferably provided.
  • In a preferred embodiment of the invention, a device for carrying out a maximum power point (MPP) tracking of the DC voltage sources connected to the inputs of the DC / DC converter (s) is also provided. The control electronics for driving the (further) switching elements is preferably part of this device.
  • The invention also provides an inverter circuit which has at least one DC-DC converter of the invention described above and at least one inverter for converting the DC voltage provided by the at least one DC-DC converter into an AC voltage at its output.
  • It is also possible to operate two or more DC-DC converters of the invention in parallel, in series or in cascade.
  • The inputs of the DC-DC converter are preferably connected to solar generators, wherein the inverter is preferably a solar inverter. The inverter can be coupled in the usual way with a grid (power grid, stand-alone grid) or a consumer. Single-phase or multi-phase inverters can be used.
  • In a preferred embodiment of the invention, the output voltage of the at least one DC-DC converter is dynamically controllable so that the at least one inverter operates in its optimum operating state.
  • The DC-DC converter can also be used for direct supply of DC loads or DC networks.
  • The above and other features and advantages of the invention will become more apparent from the following description of preferred, non-limiting embodiments with reference to the accompanying drawings. Show:
  • 1 a schematic block diagram of an inverter circuit with a DC-DC converter for illustrating the basic principle of the present invention;
  • 2 a diagram illustrating the timing of the switching elements of the DC-DC converter of the present invention; and
  • 3 a schematic block diagram of a DC-DC converter according to an embodiment of the present invention.
  • In 1 an inverter circuit is shown with a DC-DC converter, which is used as the starting point of in 3 illustrated DC-DC converter according to the invention is used. The invention will be explained in more detail below using the example of a solar inverter circuit in boost converter mode, without the invention being limited to this photovoltaic application, the combination of the DC-DC converter with an inverter or the operation of the DC-DC converter as boost converter.
  • The boost converter has two inputs IN1 and IN2, to each of which at least one DC voltage source in the form of a solar generator S1 or S2 can be connected, and a common output OUT, to which a solar inverter WR is connected. Each of the two inputs IN1, IN2 is connected in parallel with a buffer capacitor C1 or C2 for buffering ripple currents. The output OUT is connected in series with at least two further buffer capacitors C3, C4 for buffering ripple currents. The further buffer capacitors C3, C4 simultaneously form an intermediate circuit of the inverter WR connected to the output OUT.
  • The negative branch of the first input IN1 is directly connected to the negative terminal of the output OUT. In the positive branch of the first input IN1, a first switching element SW1 (for example, a semiconductor switch such as MOSFET, IGBT, JFET, HEMT, cascode, etc.) is arranged. The negative and positive branches of the first input IN1 are also connected to each other via a first rectifying element D1 (for example, a semiconductor diode or a synchronous rectifier).
  • Likewise, the positive branch of the second input IN2 is directly connected to the positive terminal of the output OUT. In the negative branch of the second input IN2, a second switching element SW2 (for example, a semiconductor switch such as MOSFET, IGBT, JFET, HEMT, cascode, etc.) is arranged. The negative and positive branches of the second input IN2 are also connected to each other via a second rectifying element D2 (for example, a semiconductor diode or a synchronous rectifier). The first and second rectifying elements D1, D2 have the same transmission direction.
  • In this way, the negative pole of the first input IN1 is connected to the negative pole of the output OUT and the positive pole of the second input IN2 is connected to the positive pole of the output OUT. Thus, radio interference can be reduced because the inputs IN1, IN2 with respect to the output OUT have no potential jumps. But in principle, other circuit arrangements are conceivable. Thus, for example, the switching element SW1 could also be connected to the negative pole of the first input IN1 and / or the switching element SW2 could also be connected to the positive pole of the second input IN2.
  • As in 1 illustrated, the two inputs IN1, IN2 (in the closed state of the two switching elements SW1, SW2) via a throttle L1 connected in series. The two ends of the inductor L1 are each connected via one of the rectifying elements D1, D2 to the common output OUT.
  • The two switching elements SW1, SW2 are controlled by control electronics (not shown). As in 2 illustrated, the two switching elements SW1, SW2 are independently controlled such that they synchronized clocked to each other (ie simultaneously closed), but operated with different duty cycles (ie open at different times). In this case, the switching element (here SW2), which is assigned to the input (in this case IN2) with the lower power, is driven with a shorter duty cycle, ie opened earlier. But there are also other controls of the switching elements SW1, SW2 conceivable; For example, the switching elements can also be clocked with different clock frequencies and / or duty cycles.
  • The control of the switching elements SW1, SW2 is preferably carried out dynamically, d. H. preferably with constant clock frequency, but with variable duty cycles. This occurs in particular as a function of the currents and voltages available at the inputs IN1, IN2 and the voltage and current values desired at the output.
  • If both switching elements SW1, SW2 are closed, the two inputs IN1, IN2 are connected in series, so that energy flows from the two solar generators S1, S2 to the output OUT, into the capacitors C3, C4 and into the inductor L1. If, for example, the second switching element SW2 is opened, thereby disconnecting the second input IN2, then the output OUT, the capacitors C3, C4 and the inductor L1 are only supplied by the solar generator S1 connected to the first input IN1.
  • If subsequently also the first switching element SW1 is opened and thus also the first input IN1 is disconnected, then the inductor L1 releases (at least partially) the energy stored in it via the freewheeling diodes D1, D2 to the output OUT. The two capacitors C3, C4 discharge (at least partially) to the output OUT.
  • With the boost converter of 1 In particular, it is also possible to connect DC voltage sources S1, S2 with different powers to the inputs IN1, IN2 and still operate the boost converter with a good efficiency. In addition, the boost converter can be composed of relatively few components, in particular, only a few expensive chokes are needed.
  • As in 1 1, the negative branch of the second input IN2 may be connected via a further rectifying element D3 to the negative branch of the first input IN1 or the negative terminal of the output OUT. Optionally, another switching element (not shown) is connected in series with this further rectifying element D3. The rectifying element D3 forms a bypass path to the first input IN1.
  • In the same way, the positive branch of the first input IN1 can be connected via a further rectifying element D4 to the positive branch of the second input IN2 or the positive terminal of the output OUT. Optionally, another switching element (not shown) is also connected in series with this further rectifying element D4. The rectifying element D4 forms a bypass path to the second input IN2.
  • The so-formed bypass paths to the inputs IN1, IN2 can be used in particular when one of the DC voltage sources S1, S2 alone already provides a power (current and / or voltage) which satisfies the desired output at the output, d. H. in the case of the boost converter reaches or exceeds the desired output power. Since in this also the inductor L1 can be bypassed, the reactive power of the circuit can be reduced and thus the efficiency of the boost converter can be improved.
  • Semiconductor diodes with very low forward voltage are particularly suitable as further rectifying elements D3, D4 in these bypass paths.
  • If it is known in advance to which of the inputs IN1, IN2 a (possibly at any time) more powerful solar generator S1, S2 is connected, so can be optionally omitted on the bypass path to this input.
  • The in 1 can also be extended to more than two inputs. Preferably, a throttle is then provided in each case between two inputs of the series connection. The bypass paths to the individual inputs can also be extended to all inputs in a corresponding manner.
  • 3 shows an embodiment of the DC-DC converter according to the invention as an extension of the in 1 illustrated, described above DC-DC converter.
  • In addition to the above in connection with the 1 described components and modes of operation, this DC-DC converter has a connection of the further buffer capacitors C3, C4 with the series connection of the inputs IN1, IN2.
  • In particular, a center tap of the capacitor half-bridge C3, C4 is connected via a series circuit of another switching element SW3 and another rectifying element D5 to the end of the inductor L1 connected to the first input IN1 and / or via a series connection of a further switching element SW4 and another rectifying element D6 is connected to the end of the inductor L1 connected to the second input IN2. The two further switching elements SW3, SW4 are also driven, for example, by the (not shown) control electronics for the switching elements SW1, SW2.
  • The other two switching elements SW3, SW4 are controlled alternately, so that they are closed at any time simultaneously. For example, when the switching element SW3 is closed, only the capacitor C4 is charged, while when the switching element SW4 is closed, only the capacitor C3 is charged.
  • In this way, for example, the capacitor half-bridge C3, C4 or the intermediate circuit formed by these for the inverter WR can be symmetrized, i. H. the capacitors C3, C4 of the bridge branches are brought to a substantially same state of charge. In addition, with a closed switching element SW3 or SW4, a smaller voltage swing at the reactor L1 decreases because the freewheeling is no longer against the potential of the output OUT, so that the reactive powers of the boost converter can be reduced.
  • Also in this embodiment of the boost converter, the bypass paths with the rectifying elements D3, D4 are optionally provided.

Claims (9)

  1. DC-DC converter, having two or more inputs (IN1, IN2), to each of which at least one DC voltage source (S1, S2) can be connected, and a common output (OUT) for providing a DC voltage, wherein the two or more inputs (IN1, IN2) are connected in series via at least one throttle (L1); each input (IN1, IN2) is connected to at least one switching element (SW1, SW2) in its negative branch and / or in its positive branch; and the switching elements (SW1, SW2) connected to the various inputs (IN1, IN2) are independently controllable, characterized in that the common output (OUT) is connected in series with at least two further capacitors (C3, C4); and a center tap of the at least two further capacitors (C3, C4) is connected via at least one further switching element (SW3) to one end of the inductor (L1) and connected via at least one further switching element (SW4) to another end of the inductor (L1) is, with the other switching elements (SW3, SW4) are controlled alternately, so that they are closed at any time simultaneously.
  2. DC-DC converter according to claim 1, characterized in that the switching elements (SW1, SW2) connected to the various inputs (IN1, IN2) are clocked synchronized with each other.
  3. DC voltage converter according to claim 1 or 2, characterized in that associated with the different inputs (IN1, IN2) connected to the switching elements (SW1, SW2) can be controlled with mutually different duty cycles.
  4. DC-DC converter according to one of the preceding claims, characterized in that each of the inputs (IN1, IN2) in each case at least one rectifying element (D1, D2) is connected in parallel.
  5. DC-DC converter according to one of the preceding claims, characterized in that the negative or positive branch of an input (IN1, IN2), in which the at least one switching element (SW1, SW2) is arranged via at least one further rectifying element (D3, D4) with a negative or positive terminal of the output (OUT) is connected.
  6. DC-DC converter according to one of the preceding claims, characterized in that each of the inputs (IN1, IN2) in each case at least one capacitor (C1, C2) is connected in parallel.
  7. DC-DC converter according to one of the preceding claims, characterized in that the common output (OUT) at least one further capacitor (C3, C4) is connected in parallel.
  8. DC-DC converter according to one of the preceding claims, characterized in that the center tap of the at least two further capacitors (C3, C4) via a series circuit of the at least one further switching element (SW3) and a still further rectifying element (D5) with the one end of the throttle ( L1) is connected and / or via a series circuit of the at least one further switching element (SW4) and a still further rectifying element (D6) to the other end of the throttle (L1) is connected.
  9. Inverter circuit, in particular solar inverter circuit, with at least one DC-DC converter according to one of the preceding claims and at least one inverter (WR) for converting the provided by the at least one DC-DC converter at its output (DC) DC voltage into an AC voltage.
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DE4422409A1 (en) * 1994-06-29 1996-01-11 Fraunhofer Ges Forschung Method and device for exchanging charges between a plurality of energy stores or converters connected in series
DE102008050402A1 (en) * 2008-10-04 2010-04-08 Diehl Ako Stiftung & Co. Kg Circuit arrangement with a boost converter and inverter circuit with such a circuit arrangement
DE102010006124A1 (en) * 2010-01-29 2011-08-04 Diehl AKO Stiftung & Co. KG, 88239 Circuit arrangement with a boost converter and inverter circuit with such a circuit arrangement
DE102011011329A1 (en) * 2010-11-05 2012-05-10 Diehl Ako Stiftung & Co. Kg Boost converter
DE102011018355A1 (en) * 2011-04-20 2012-10-25 Diehl Ako Stiftung & Co. Kg DC converter

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