• 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:
    DC-DC converter reducer and elevator, CC-CC conversion method, and photovoltaic plant that incorporates said converter. Converter (10) and method of converting direct current to direct current with reduction capacity and current rise, which incorporates a recovery circuit that uses the energy stored in parasitic inductances of an autotransformer (A), transferring it to an auxiliary capacitor (Cs), and partially to the output capacitance (Coss), when opening an input switch (S). It is thus possible to use the parasitic energy of the autotransformer (A) advantageously, achieving an optimized performance, for applications without the need to incorporate galvanic isolations, in addition the topology and operating mode favors achieving a rapid dynamic response and smooth switching. The converter and its associated method can be applied both to photovoltaic systems for serial connection of panels and portable devices powered by batteries, LEDs, etc. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2681127A1
    申请号:ES201730311
    申请日:2017-03-09
    公开日:2018-09-11
    发明作者:Andrés BARRADO BAUTISTA；David LÓPEZ DEL MORAL HERNÁNDEZ；Clara Marina SANZ GARCÍA；Antonio LÁZARO BLANCO；Cristina FERNÁNDEZ HERRERO；Pablo ZUMEL VAQUERO；María Del Carmen RAGA ARROYO；Emilio OLÍAS RUIZ
    申请人:Universidad Carlos III de Madrid；
    IPC主号:
    专利说明:

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    System performance panel converter.
    In addition, the converter and conversion method of the invention can be advantageously applied to other applications outside of photovoltaic systems, such as for example
    5 the power of portable systems such as PDAs, mobile phones, tablets, etc. which are powered by a battery whose voltage level varies depending on the consumption or recovery of battery power.
    The evolution of the voltage in the battery means that this voltage can be greater, equal or
    10 less than necessary for the proper functioning of the circuits to be fed, so a converter that has a reductive-lifting capacity, good performance, simple and with good dynamic performance is required.
    In short, the converter, conversion method, and photovoltaic plant described 15 provide the following advantages over the alternatives known in the state of the
    Technique:  Ability to act as a booster and tension reducer  High efficiency, because only part of the output power is processed
    magnetically.
    20  Good dynamic behavior.  Only two windings are required in the autotransformer.  Autotransformer demagnetization is carried out without winding of
    demagnetization and not including galvanic isolation.  Autotransformer dispersion inductance is used as an advantage instead
    25 as a disadvantage to obtain the zero current switching condition (ZCS), which allows to increase the working frequency and reduce the size of the coils and capacitors.
     The ZCS condition is obtained both in the third diode and in the fourth diode, and both during the on and off half-period.
    30  The ZCS condition is obtained at the MOSFET switch, reducing the electromagnetic interference (EMI) of the resulting 'electromagnetic interference'.
     The operational frequency can be high achieving the reduction of the demagnetization inductance of the autotransformer, and the size of said autotransformer, of the capacitor and of the filtration inductance.  The current through the demagnetization inductance is centered, which
    7
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    Finally, the converter comprises four diodes:
     A first diode (Ds1) with the anode connected to ground and the first terminal (p) of the autotransformer (A), and the cathode connected to the auxiliary capacitor (Cs) and the cathode of the second diode (Ds2).
    5  A second diode (Ds2) with the anode connected to the auxiliary capacitor (Cs) and the cathode of the first diode (Ds1), and the cathode connected to the output coil (L) and cathodes of the third diode (D1) and of the fourth diode (D2). The first diode (Ds1) and the second diode (Ds2), together with the auxiliary capacitor (Cs), make up the recovery circuit of the parasitic inductances of the autotransformer.
    10  A third diode (D1) with the anode connected to the third terminal of the autotransformer
    (A) and the cathode connected to the output coil (L) and to the cathodes of the second diode (Ds2) and the fourth diode (D2).  A fourth diode (D2) with the ground anode and the first terminal (p) of the
    autotransformer (A), and the cathode connected to the output coil (L) and to the 15 cathodes of the second diode (Ds2) and the third diode (D1).
    In alternative embodiments, one or more of the aforementioned diodes may be implemented by power transistors controlled by a control logic, providing a bidirectional circuit.
    Figure 3 exemplifies an application scenario of the converter of the invention, in a photovoltaic plant (20), comprising a plurality of solar panels (30) in a DMPPT architecture, that is, it comprises a plurality of assemblies (40) or strings, so that all assemblies (40) are connected in parallel to provide a
    25 output power at an output voltage (Vs), while the solar panels (30) of each assembly (40) are connected in series with each other through the converters (10). There is, therefore, a converter (10) for each solar panel (30), said converters (10) having the topology described by any of the embodiments of the first aspect of the invention. This configuration, together with the individual benefits of
    30 converter (10), allows to adapt dynamically and efficiently to different conditions of irradiance, temperature, shade, etc.
    Figures 4 to 8 illustrate the operation of a preferred embodiment of the converter and conversion method of the invention, showing the paths followed by the current 35 both when the switch (S) is closed, a state which we will call for simplicity tON, as when it is open, state that we will call tOFF. The tOFF state is
    eleven
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    权利要求:
    Claims (1)
    [1]
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    同族专利:
    公开号 | 公开日
    ES2681127B2|2019-05-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2018-09-11| BA2A| Patent application published|Ref document number: 2681127 Country of ref document: ES Kind code of ref document: A1 Effective date: 20180911 |
    2019-05-07| FG2A| Definitive protection|Ref document number: 2681127 Country of ref document: ES Kind code of ref document: B2 Effective date: 20190507 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201730311A|ES2681127B2|2017-03-09|2017-03-09|DC-DC converter reducer and elevator, CC-CC conversion method, and photovoltaic plant that incorporates said converter.|ES201730311A| ES2681127B2|2017-03-09|2017-03-09|DC-DC converter reducer and elevator, CC-CC conversion method, and photovoltaic plant that incorporates said converter.|
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