• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for controlling an inverter and an inverter having a DC / DC stage with at least one main switch (S2) and a relief circuit, and a DC / AC stage, the relief circuit being constituted by a series connection of a bidirectional switching element comprising two switches ( SA 1, SA2), and an inductance is formed and means for controlling the switches (SA 1, SA2) is provided and arranged such that alternately a switch (SA 1, SA2) is turned on and its turn-on before a switch-off of the main switch (S2) is determined by the control device.
    公开号:AT513991A1
    申请号:T50145/2013
    申请日:2013-03-05
    公开日:2014-09-15
    发明作者:
    申请人:Fronius Int Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a method for controlling an inverter and an inverter, in particular a photovoltaic inverter.
    The object of the invention is to achieve a switching discharge of the main switch and thus to achieve a higher efficiency and power density.
    The object is achieved by a method for controlling an inverter with a DC / DC stage with at least one main switch (S2) and a discharge circuit, and a DC / AC stage, wherein the discharge circuit by a series circuit of a bidirectional switching element comprising two Switch (SA1, SA2), and an inductance is formed and the switches (SAl, SA2) are controlled such that alternately a switch (SAl, SA2) is turned on and set its on-time before a switch-off of the main switch (S2) of the scheme becomes.
    The object is also achieved by an inverter having a DC / DC stage with at least one main switch (S2) and a discharge circuit, and a DC / AC stage, wherein the discharge circuit is formed by a series connection of a bidirectional switching element comprising two switches (SAl , SA2), and an inductance is formed and a means for controlling the switches (SAl, SA2) is provided and is designed such that alternately a switch (SAl, SA2) is turned on and its turn-on before a switch-off of the main switch (S2) is determined by the control device.
    It is advantageous here that the provision of an auxiliary voltage source necessary for the discharge circuit takes place without additional components, so that the losses and costs are kept to a minimum. Accordingly, this has a positive effect on the efficiency.
    Furthermore, a symmetrical distribution of the voltages across the capacitors / electrolytic capacitors in the DC link can be achieved thereby also improving the efficiency.
    The inventive circuit according to FIG. 1 will now be described below. 2/13 2
    The basic circuit is correspondingly a boost converter, wherein two capacitors or electrolytic capacitors are connected in series at the output. An output node thus arises between the capacitors. It is also possible to use only the lower capacitor. The discharge circuit is arranged between the center and the node of input inductor or input inductance, switch S2 and diode of the boost converter. The input choke is supplied in accordance with at least one solar generator or solar module.
    The discharge circuit comprises a series connection of an inductor or choke and a bidirectional switching element, comprising the switches SA1 and SA2.
    At the output node while the partial voltage Uzt is tapped, with the DC link voltage Uz applied across both capacitors.
    At the node, the voltage Us2 is tapped, which has an influence on the control method. Furthermore, the current through the throttle of the discharge circuit Ilr is relevant. The throttle can also be designed as a resonance throttle.
    The control method will now be described with reference to FIG. 2.
    After the first switching cycle from the main switch S2 - ie after switching off - the voltage Us2 increases because the input choke via the diode keeps the current flow upright. With the switch-off of S2, SA2 is simultaneously turned on, whereby the current ILR starts to flow through the choke of the discharge circuit. After the Us2 has reached the partial voltage Uzt, the current ILR turns back around and drops to zero. Us2 essentially remains in line with the value of the intermediate circuit voltage Uz until SA2 is switched off and SA1 is switched on. At this time, the throttle of the relief circuit begins to charge in the opposite direction, as seen on the course of ILR. Also, substantially at this time, the voltage Us2 begins to decrease, and the switch SA1 is turned on.
    After Us2 has dropped to zero, the main switch S2 can be switched on without loss, ie without voltage, thus starting the next cycle. Within one cycle, the energy balance of ILR is relevant. That is, it should be the positive half-wave and the negative half-wave equal, so in total zero. If this is the case, the partial voltage Uzt is one-half of Uz. Thus, the ratio of DC link voltage to partial voltage 2: 1, which is required. If this is not the case, as shown, Uzt has a higher value. 3/13 3
    The regulation is thus anxious to reduce the value of Uzt in the next cycle. This is achieved according to the invention by switching SA2 on before S2 is switched off. This causes the throttle of the discharge circuit is charged longer and correspondingly the partial voltage Uzt decreases.
    Accordingly, the turn-on time of SA2 is adjusted each cycle until it sets the ratio of 2: 1. Thus, the voltages on the capacitors are maintained at substantially the same level. The difference between the switch-on time of SA2 and the switch-off time of S2 is thus adjusted according to the current ratio of Uz to Uzt. Depending on the switching frequency, the difference is in the range of a few hundred ns. The controlled variable is the differential voltage from Uz to Uzt.
    Of course, the diode can also be replaced by a switch, such as mosfets.
    Likewise, ILR can also be used as a controlled variable by controlling the sum to zero per cycle.
    This is illustrated by way of example in FIG. 3, which represents a multilevel DC / DC stage. This is used in particular for three-phase DC / AC stages with higher input voltage ranges.
    If the unloading circuit is used in a step-down converter, the functions of SA1 and SA2 must be exchanged.
    When the relieving circuit is used in a DC / AC stage, such as a bridge circuit, the function of SA1 and SA2 and their regulation is adjusted depending on the mode of operation currently used, ie either boost converter or buck converter.
    In the following figures, DC / AC stages are still shown, which can be combined with the inventive circuit. The blocks represent the unloading circuit. 4/13 4
    4 shows a single-phase DC / AC stage with an H4 bridge, which can be used, for example, in a so-called microinverter directly on the solar module.
    Fig. 5 shows a B6 circuit for three-phase DC / AC stages.
    In Fig. 6, finally, a circuit topology for single-phase and three-phase DC / AC stages is shown, in which case the neutral or Stempunkt depends on the half-DC link voltage. An advantage here is a so-called static generator. 5.13
    权利要求:
    Claims (7)
    [1]
    A method of controlling an inverter having a DC / DC stage with at least one main switch (S2) and a discharge circuit, and a DC / AC stage, the relief circuit being connected in series by a bidirectional switching element comprising two switches (SA1, SA2), and an inductance is formed and the switches (SA1, SA2) are controlled such that alternately a switch (SA1, SA2) is turned on and its turn-on before a turn-off time of the main switch (S2) is determined by the scheme ,
    [2]
    2. The method according to claim 1, characterized in that an intermediate circuit voltage (Uz) at the output of the DC / DC stage and a partial voltage (Uzt) of the intermediate circuit voltage (Uz) is detected and the switch-on of a switch (SAl, SA2) in response to a Ratio of the intermediate circuit voltage (Uz) to the partial voltage (Uzt) is set.
    [3]
    3. The method according to claim 2, characterized in that the switches (SAl, SA2) of the discharge circuit are controlled such that the partial voltage (Uzt) substantially equal to half the intermediate circuit voltage (Uz).
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that the switches (SAl, SA2) of the bidirectional switching element are switched equal to each other.
    [5]
    5. Inverter with a DC / DC stage with at least one main switch (S2) and a discharge circuit, and a DC / AC stage, wherein the discharge circuit by a series circuit of a bidirectional switching element comprising two switches (SAl, SA2), and an inductance is formed and a device for controlling the switch (SAl, SA2) is provided and is designed such that alternately a switch (SAl, SA2) is turned on and whose turn-on before a switch-off of the main switch (S2) is determined by the control device ,
    [6]
    6. Inverter according to claim 5, characterized in that the DC / DC stage is a boost converter. 6.13
    [7]
    7. Inverter according to claim 5 or 6, characterized in that the DC / DC stage is a buck converter. 7.13
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    同族专利:
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    引用文献:
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    US20080094866A1|2006-07-06|2008-04-24|Jennifer Bauman|Capacitor-switched lossless snubber|
    AT505801A1|2007-09-20|2009-04-15|Siemens Ag Isterreich|METHOD FOR OPERATING AN ELECTRONICALLY CONTROLLED INVERTER|
    CN101610038A|2009-07-13|2009-12-23|南京航空航天大学|The photovoltaic combining inverter of Boost and Buck cascade and control method thereof|
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    US7589986B2|2006-04-19|2009-09-15|International Rectifier Corporation|Single stage integrated boost inverter motor drive circuit|US9112550B1|2014-06-25|2015-08-18|Kandou Labs, SA|Multilevel driver for high speed chip-to-chip communications|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50145/2013A|AT513991B1|2013-03-05|2013-03-05|Method for controlling an inverter and inverter|ATA50145/2013A| AT513991B1|2013-03-05|2013-03-05|Method for controlling an inverter and inverter|
    PCT/AT2014/050046| WO2014134647A1|2013-03-05|2014-02-28|Method for regulating an inverter, and inverter|
    US14/772,937| US9812988B2|2013-03-05|2014-02-28|Method for controlling an inverter, and inverter|
    EP14712186.7A| EP2951912B1|2013-03-05|2014-02-28|Method for regulating an inverter, and inverter|
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