Classifications

• • 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
  • H02M3/1582—Buck-boost converters
• • 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
  • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
  • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
  • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
  • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• • 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
  • H02M1/00—Details of apparatus for conversion
  • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
  • H02M1/007—Plural converter units in cascade

Definitions

• the invention relates to an inverter with a bridge circuit having four switching elements, in which two opposite terminals of the bridge circuit are connected to the DC voltage part of the inverter, and the other two terminals of the bridge circuit are connected to the AC voltage part of the inverter, wherein by suitable control of the switching elements Gleich - and AC voltage are interconvertible, according to the preamble of claim 1.
• Inverters are widely used in electrical engineering, particularly in alternative power generation systems such as fuel cell systems and photovoltaic systems (so-called “dormant systems”), or wind turbines (so-called “rotating systems”).
• dormant systems require an inverter that converts the resulting DC power into AC power and feeds it to the grid.
• Rotating systems generate AC power, which is usually converted into DC power first and then converted back into AC power, on the one hand, to expand the working range (eg speed range) on the mechanical side of the generator on the other hand, but also to ensure the required for a grid feed quality of the AC voltage.
• Inverters thereby enable a separation of the supply-side electrical parameters from those of the network-side parameters such as frequency and voltage, and thus represent the central link between the supply side and the network.
• inverters are often used with a bridge circuit having four switching elements, in which two opposite connection terminals the bridge circuit are connected to the DC voltage part of the inverter, and the other two terminals of the bridge circuit are connected to the AC voltage part of the inverter, wherein DC and AC voltage can be converted into each other by suitable control of the switching elements.
• expensive components are usually required for the switching elements of the bridge circuit, such as FRED (Fast Recovery Epitax Diode) FETs, since sometimes high switching frequencies must be ensured. This has a negative effect on the cost of conventional circuit arrangements, and also affects the efficiency of conventional inverters, since with each switching operation unavoidable switching losses are connected.
• Inverter topology in conjunction with the real behavior of the components to achieve an increase in efficiency and power quality at a lower cost.
• Claim 1 relates to an inverter with a bridge circuit comprising four switching elements, in which two opposite terminals of the bridge circuit are connected to the DC voltage part of the inverter, and the other two terminals of the bridge circuit are connected to the AC voltage part of the inverter, wherein by appropriate control of the Switching elements DC and AC voltage are interconvertible.
• a first DC side switching element is coupled in the DC voltage part to the positive DC voltage terminal, to which an inductance connected in series between the first switching element and a first terminal of the bridge circuit and a diode are arranged.
• Claim 2 provides an embodiment that is particularly advantageous when the input voltage on the DC side is less than the maximum value of the output side grid voltage.
• Claim 2 provides for this purpose that in the series connection between the inductor and the diode on the one hand, and a second terminal of the bridge circuit on the other hand, a second, DC side switching element is connected, which connects the inductance with the second terminal of the bridge circuit in the closed state.
• the DC voltage-side input voltage can be boosted by suitable switching of the second switching element.
• the use of a single inductance allows further cost savings.
• Claims 3 to 5 provide advantageous developments of the inventive changer.
• an AC-side smoothing capacitor is connected, and in the DC voltage part a DC-side smoothing capacitor.
• the DC-side switching elements are semiconductor switching elements, in particular a power MOSFET or IGBT.
• FIG. 1 shows the basic circuit diagram of the inverter according to the invention in a first representation
• Fig. 2 shows the basic circuit diagram of the inverter according to the invention in a second representation
• Fig. 3 shows the time course of voltage and control signal for the switching elements in the energy flow in the AC voltage part of the inverter according to the invention.
• the inverter according to the invention has a bridge circuit with four switching elements S3, S4, S5 and S6, in which two opposite terminals 1, 2 of the bridge circuit are connected to the DC voltage part of the inverter, and the two other terminal terminals 3, 4 of the bridge circuit the AC voltage part of the inverter.
• the conversion of DC voltage into AC voltage is carried out via the four switching elements S3, S4, S5 and S6 in the bridge circuit, which represents a full bridge, in a conventional manner by suitable control of the switching elements S3, S4, S5 and S6 DC. and AC voltage are interconvertible.
• a first, Gleichwoods wornes switching element Sl is coupled to the positive DC voltage terminal, to which a connected between the first switching element Sl and a first Anschlußklemnme 1 of the bridge circuit in series inductance Ll and a diode D2 are arranged downstream.
• a second, Gleichwoods wornes switching element S2 is switched, which connects the inductance Ll with the second terminal 2 of the bridge circuit in the closed state.
• the diode D2 is connected between the positive DC voltage terminal and the first terminal 1 of the bridge circuit in the forward direction.
• the DC part is the DC voltage source U e .
• AC voltage side smoothing capacitor C 0 In the AC voltage part is further connected an AC voltage side smoothing capacitor C 0 , and in
• the switching elements S1, S2, S3, S4, S5 and S6 are preferably semiconductor switching elements, in particular a power MOSFET.
• FIG. 2 shows the embodiment according to FIG. 1 in an alternative embodiment.
• FIG. 3 firstly explains the switch-on phase of the switching sequence in the positive half-cycle in the case of the inventive inverter according to FIG. 1, the energy flowing from the DC voltage part into the AC voltage part.
• the control of the switching elements and in particular their timing can be taken from the lower diagrams of FIG.
• the switching elements S4 and S6 always remain closed, ie conductive, while the switching elements S3 and S5 always remain switched off, ie they are not conductive, in order to generate the positive half wave at the output terminals of the AC voltage part.
• the duty cycle as can be seen in FIG.
• the first, DC-side switching element S1 is closed with increasing duty cycle, and for the descending region of the positive half-wave with decreasing ON duration.
• the first Heidelbergelemnt Sl clocked on the DC side via the inductance Ll and the diode D2 power into the network. If the mains voltage exceeds the same voltage-side input voltage, the latter is set by means of the second, DC-side switching element S2 high.
• the first switching element Sl remains closed, that is conductive, while an increase in voltage is brought about by suitable timing of the second switching element S2.
• a diode D1 which is connected between the second terminal 2 of the bridge circuit and the first DC side switching element S1, may be provided in the DC voltage part, the anode side being connected to the second terminal 2 of the bridge circuit, and the cathode side being connected to the first switching element S1 is.
• the freewheeling of the inductance L1 is thus effected via the diode D2 connected to the first connection terminal 1 of the bridge circuit, the load on the AC side, and the diode D1 connected to the second connection terminal 2 of the bridge circuit.
• the switching elements S3 and S5 are always closed, that is conductive, while the switching elements S4 and S6 always remain switched off, so are not conductive.
• the duty cycle as shown in FIG. 3 can be seen, selected so that the first, DC-side switching element Sl is closed with increasing duty cycle, and for the rising range of the negative half-wave with decreasing duty cycle.
• the first switching element S1 on the DC side clocks current into the network via the inductance L1 and the diode D2. If the mains voltage exceeds the DC voltage-side input voltage, the latter can in turn be boosted by means of the second, DC-side switching element S2.
• the first switching element S1 remains closed, that is to say conductive, while an increase in voltage for generating the negative maximum value is brought about by suitable timing of the second switching element S2.
• the switching elements S3, S4, S5 and S6 of the bridge circuit only have to be switched at zero crossing with the line frequency. Only the first, DC side switching element Sl is clocked to feed the current quickly, so that even at this switching element Sl significant switching losses.
• the efficiency of the inverter according to the invention can thereby be significantly increased in any case, up to 98%. If the DC voltage-side input voltage is lower than the mains voltage, an additional, second switching element S2 can be used.
• the switching elements S3, S4, S5 and S6 of the bridge circuit can also use less expensive components, whereby the cost of the overall circuit can be reduced.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Inverter Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=39512710

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (8)

Family Cites Families (12)

• 2007
  • 2007-02-16 AT AT0024707A patent/AT504944B1/de not_active IP Right Cessation
• 2008
  • 2008-01-17 US US12/527,244 patent/US20100118575A1/en not_active Abandoned
  • 2008-01-17 JP JP2009549384A patent/JP2010518806A/ja active Pending
  • 2008-01-17 EP EP08707968A patent/EP2118994A1/de not_active Withdrawn
  • 2008-01-17 WO PCT/EP2008/050521 patent/WO2008098812A1/de active Application Filing
  • 2008-01-17 KR KR1020097018929A patent/KR20090108668A/ko not_active Application Discontinuation
  • 2008-01-17 CN CN200880005176A patent/CN101669276A/zh active Pending

Non-Patent Citations (1)

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