WO2016000658A1 - 光伏逆变器的保护电路 - Google Patents

光伏逆变器的保护电路 Download PDF

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Publication number
WO2016000658A1
WO2016000658A1 PCT/CN2015/083275 CN2015083275W WO2016000658A1 WO 2016000658 A1 WO2016000658 A1 WO 2016000658A1 CN 2015083275 W CN2015083275 W CN 2015083275W WO 2016000658 A1 WO2016000658 A1 WO 2016000658A1
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protection
circuit
photovoltaic inverter
benefit
safety
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PCT/CN2015/083275
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English (en)
French (fr)
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张嘉鑫
卓森庆
游剑波
马鑫
李发顺
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珠海格力电器股份有限公司
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Publication of WO2016000658A1 publication Critical patent/WO2016000658A1/zh

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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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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  • the invention relates to the field of photovoltaic power generation inverter technology, in particular to a protection circuit of a photovoltaic inverter.
  • a photovoltaic inverter is a power conversion device that inverts a direct current generated by a solar panel into an alternating current.
  • the output voltage and output power of a single solar panel have certain limitations. In practical applications, the solar panels need to be connected in series or in parallel according to the input voltage and output power of the photovoltaic inverter.
  • Series solar panels can increase their output voltage to match the input voltage of the PV inverter; parallel solar panels can increase their output current, depending on the actual output power of the PV inverter, one or more input terminals .
  • the present invention provides a protection circuit for a photovoltaic inverter that has a simple structure and prevents accidental electric shock accidents.
  • the present invention provides a protection circuit for a photovoltaic inverter, the photovoltaic inverter including an input terminal, an output terminal, and an internal circuit, wherein the input terminal and the output terminal are respectively electrically connected to the internal circuit Connected, the protection circuit includes a safety protection switch device;
  • the input terminal and the internal circuit are electrically connected by the safety protection switch device;
  • the safety protection switch device includes a plurality of parallel protection switches, and each of the input terminals corresponds to one of the protection switches.
  • the number of the protection switches is the same as the number of the input terminals, and one-to-one correspondence.
  • the number of the protection switches is eight.
  • the safety protection switching device is fixed to a main board of the internal circuit.
  • a control box is further included;
  • the internal circuit and the safety protection switching device are disposed in the control box.
  • the safety protection switch device is fixed to a side wall of the control box.
  • the protection switch is a knife switch, a push button switch or a toggle switch.
  • the protection switch is a short circuit block, a short circuit cap or a circlip type on-off structure having an on-off function.
  • the protection circuit of the photovoltaic inverter of the invention comprises a safety protection switch device, which is arranged between the input terminal and the internal circuit, and is used for realizing the safety protection function of the input terminal of the photovoltaic inverter, and can also realize other functions.
  • the safety protection switch device comprises a plurality of parallel protection switches, and each input terminal corresponds to a protection switch for opening or closing the connection between the input terminal and the internal circuit.
  • FIG. 1 is a schematic structural view of an embodiment of a protection circuit of a photovoltaic inverter of the present invention.
  • an embodiment of the present invention provides a protection circuit for a photovoltaic inverter.
  • the photovoltaic inverter includes an input terminal 1 , an output terminal 2 , an internal circuit 4 , and an input terminal 1 and an output terminal 2 respectively and an internal circuit 4 .
  • the electrical connection, the protection circuit comprises a safety protection switch device 3; the input terminal 1 and the internal circuit 4 are electrically connected by the safety protection switch device 3; the safety protection switch device 3 comprises a plurality of parallel protection switches, each of which corresponds to a protection switch .
  • a protection circuit for a photovoltaic inverter provided by an embodiment of the present invention, wherein the photovoltaic inverter includes an input terminal 1 for accessing a solar panel output for accessing a mains grid, outputting single-phase alternating current or three-phase alternating current An output terminal 2 and an internal circuit for inverting current, the protection circuit comprising a safety protection switching device 3 disposed between the input terminal 1 and the internal circuit 4, the safety protection switching device 3 comprising a plurality of parallel protection switches, and each The input terminal 1 corresponds to a protection switch, one end of the protection switch is electrically connected to the input terminal 1, and one end is electrically connected to the internal circuit 4 for disconnection.
  • the photovoltaic inverter generally has a plurality of input terminals 1, each of which corresponds to a protection switch, which can ensure the safety of the input terminal 1.
  • a protection switch which can ensure the safety of the input terminal 1.
  • the number of protection switches is the same as the number of input terminals 1, and one-to-one correspondence.
  • the number of the protection switches is set to be the same as the number of the input terminals 1, and one-to-one correspondence ensures that each of the input terminals 1 can be disconnected from the internal circuit 4, thereby ensuring the safety of the input terminal 1.
  • the implementer does not need to consider which input terminals 1 should be connected to the wires, and which input terminals can not access the wires. For the implementer, the complexity of the operation is reduced, and the implementation is simple.
  • the number of protection switches is eight.
  • 8 protection switches are respectively a first protection switch S1, a second protection switch S2, a third protection switch S3, and a fourth protection.
  • the switch S4 the fifth protection switch S5, the sixth protection switch S6, the seventh protection switch S7, and the eighth protection switch S8.
  • One end of the first protection switch S1 is electrically connected to the first input terminal, and the other end is electrically connected to the internal circuit 4; one end of the second protection switch S2 is electrically connected to the second input terminal, and the other end is electrically connected to the internal circuit 4; One end of the protection switch S3 is electrically connected to the third input terminal, and the other end is electrically connected to the internal circuit 4; one end of the fourth protection switch S4 is electrically connected to the fourth input terminal, and the other end is electrically connected to the internal circuit 4; the fifth protection switch One end of S5 is electrically connected to the fifth input terminal, and the other end is electrically connected to the internal circuit 4; one end of the sixth protection switch S6 is electrically connected to the sixth input terminal, and the other end is electrically connected to the internal circuit 4; the seventh protection switch S7 One end is electrically connected to the seventh input terminal, and the other end is electrically connected to the internal circuit 4; one end of the eighth protection switch S8 is electrically connected to the eighth input terminal, and the other end is electrical
  • Each input terminal 1 corresponds to a protection switch. When the input terminal 1 is not connected to the wire, the corresponding protection switch is disconnected from the internal circuit 4 to prevent the photovoltaic inverter from being suspended during normal operation.
  • the input terminal 1 is electrically touched by a strong electric current.
  • the safety protection switching device 3 is fixed to the main board of the internal circuit 4.
  • the safety protection switch device 3 is fixed on the main board of the internal circuit, and the safety protection switch device 3 can be soldered to the main board of the internal circuit, or can be electrically connected to the main board of the internal circuit 4 by means of a connector or the like to prevent it from moving freely.
  • the circuit is faulty.
  • a control box 5 is also included, and the internal circuit 4 and the safety protection switching device 3 are disposed in the control box 5.
  • the internal circuit 4 and the safety protection switching device 3 are disposed in the control box 5, which can prevent the safety failure caused by the internal circuit 4 and the safety protection switching device 3, and can ensure the clean and beautiful appearance of the photovoltaic inverter.
  • the safety protection switching device 3 is fixed to the side wall of the control box 5.
  • the safety protection switch device 3 can be fixed to the side wall of the control box 5 by screws or bolts, which is convenient for the operator to operate and prevents it from moving at will.
  • the protection switch is a knife switch, a push button switch or a toggle switch.
  • the protection switch is a short-circuit block, a short-circuit cap or a circlip-type on-off structure having an on-off function.
  • protection switch is not limited to the switches and structures in the above embodiments, and may be other structures having an on-off function.

Abstract

一种光伏逆变器的保护电路,光伏逆变器包括输入端子(1)、输出端子(2)和内部电路(4),输入端子和输出端子分别与内部电路电连接,保护电路包括安全保护开关装置(3);输入端子和内部电路通过安全保护开关装置电连接;安全保护开关装置包括多个并联的保护开关(S1-S8),每个输入端子对应一个保护开关。该保护电路结构简单、易于实施,可防止触电等安全事故的发生,提高光伏逆变器的安全性。

Description

光伏逆变器的保护电路
相关申请
本专利申请要求2014年7月4日申请的,申请号为201410316978.9,名称为“光伏逆变器的保护电路”的中国专利申请的优先权,在此将其全文引入作为参考。
技术领域
本发明涉及光伏发电逆变技术领域,特别是涉及一种光伏逆变器的保护电路。
背景技术
光伏逆变器是将太阳能电池板产生的直流电逆变为交流电的电能变换装置。单块太阳能电池板的输出电压、输出功率都有一定的限制,实际应用中,需要根据光伏逆变器的输入电压、输出功率等指标,将太阳能电池板进行串联或并联。串联的太阳能电池板可以提高其输出电压以匹配光伏逆变器的输入电压;并联的太阳能电池板可以增大其输出电流,根据光伏逆变器实际输出功率的需要,有一路或多路输入端子。
光伏逆变器的输入端子处,预留有多路太阳能电池板的输入接口,这些输入接口在外部是独立的,但在内部电路却直接进行电气连接。当有一路太阳能电池板输出接入光伏逆变器的输入端子时,其余的输入端子悬空,但是由于所有输入端子内部是电气连接的,这些悬空的输入端子也将带电。而悬空的这些输入端子一般位于光伏逆变器控制箱的外部,方便接线,但很可能会使人误认为没电,从而放松警惕,不小心触摸或触碰这些悬空的输入端子,发生触电等安全事故。
发明内容
针对传统技术易发生触电安全事故的问题,本发明提供了一种结构简单,防止发生意外触电事故的光伏逆变器的保护电路。
为达到发明目的,本发明提供一种光伏逆变器的保护电路,所述光伏逆变器包括输入端子、输出端子和内部电路,所述输入端子和所述输出端子分别与所述内部电路电连接,所述保护电路包括安全保护开关装置;
所述输入端子和所述内部电路通过所述安全保护开关装置电连接;
所述安全保护开关装置包括多个并联的保护开关,每个所述输入端子对应一个所述保护开关。
作为一种可实施例,所述保护开关的数量与所述输入端子的数量相同,且一一对应。
作为一种可实施例,所述保护开关的数量为8个。
作为一种可实施例,所述安全保护开关装置固定在所述内部电路的主板上。
作为一种可实施例,还包括控制箱;
所述内部电路和所述安全保护开关装置设置在所述控制箱内。
作为一种可实施例,所述安全保护开关装置固定在所述控制箱的侧壁上。
作为一种可实施例,所述保护开关为闸刀式开关、按键式开关或拨动式开关。
作为一种可实施例,所述保护开关为具有通断作用的短路块、短路帽或卡簧式通断结构。
本发明的有益效果包括:
本发明的光伏逆变器的保护电路,包括安全保护开关装置,设置在输入端子和内部电路之间,用于实现对光伏逆变器输入端子的安全保护功能,也可实现其他的功能。该安全保护开关装置包括多个并联的保护开关,且每个输入端子对应一个保护开关,保护开关用于断开或闭合输入端子和内部电路之间的连接。当光伏逆变器正常工作时,没有接入太阳能电池板导线的输入端子对应的保护开关断开,可以防止触电等安全事故的发生,提高了光伏逆变器的安全性,且其结构简单、易于实施。
附图说明
图1为本发明的光伏逆变器的保护电路的一实施例的结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例对本发明光伏逆变器的保护电路进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。
参见图1所示,本发明实施例提供一种光伏逆变器的保护电路,光伏逆变器包括输入端子1、输出端子2、内部电路4,输入端子1和输出端子2分别与内部电路4电连接,保护电路包括安全保护开关装置3;输入端子1和内部电路4通过安全保护开关装置3电连接;安全保护开关装置3包括多个并联的保护开关,每个输入端子1对应一个保护开关。
本发明实施例提供的光伏逆变器的保护电路,其中光伏逆变器包括用于接入太阳能电池板输出的输入端子1,用于接入市电电网、输出单相交流电或三相交流电的输出端子2和用于逆变电流的内部电路,保护电路包括安全保护开关装置3,设置在输入端子1和内部电路4之间,该安全保护开关装置3包括多个并联的保护开关,且每个输入端子1对应一个保护开关,保护开关一端与输入端子1电连接,一端与内部电路4电连接,用于断开 或闭合内部电路与输入端子之间的连接,光伏逆变器一般都有多个输入端子1,每个输入端子1对应一个保护开关,可以保证输入端子1的安全性。当太阳能电池板的输出功率较大时,单根导线的通流能力有限,需要采用多根导线分别接入光伏逆变器的多个输入端子1;当太阳能电池板的输出功率较小时,可能只需采用一根或几根导线分别接入光伏逆变器的一个或多个输入端子1。当光伏逆变器正常工作时,存在输入端子1没有和太阳能电池板通过导线连接而悬空,则通过保护开关手动断开这些悬空的输入端子1和内部电路4的连接,使悬空的输入端子1不带电,进而防止人不小心触摸或触碰这些悬空的输入端子1而发生触电等安全事故,提高了光伏逆变器的安全性,且该光伏逆变器的保护电路结构简单、易于实施。
作为一种可实施方式,保护开关的数量与输入端子1的数量相同,且一一对应。
设置保护开关的数量与输入端子1的数量相同,且一一对应,可以保证每个输入端子1都能与内部电路4断开,从而保证输入端子1的安全性。采用该实施例,实施者不用考虑哪些输入端子1应该接入导线,哪些输入端子可以不接入导线,对于实施者,降低了操作的复杂度,实施简便。
作为一种可实施方式,保护开关的数量为8个。
如图1所示,在该实施例中,输入端子1和保护开关都有8个,8个保护开关分别为第一保护开关S1、第二保护开关S2、第三保护开关S3、第四保护开关S4、第五保护开关S5、第六保护开关S6、第七保护开关S7和第八保护开关S8。第一保护开关S1的一端与第一输入端子电连接,另一端与内部电路4电连接;第二保护开关S2的一端与第二输入端子电连接,另一端与内部电路4电连接;第三保护开关S3的一端与第三输入端子电连接,另一端与内部电路4电连接;第四保护开关S4的一端与第四输入端子电连接,另一端与内部电路4电连接;第五保护开关S5的一端与第五输入端子电连接,另一端与内部电路4电连接;第六保护开关S6的一端与第六输入端子电连接,另一端与内部电路4电连接;第七保护开关S7的一端与第七输入端子电连接,另一端与内部电路4电连接;第八保护开关S8的一端与第八输入端子电连接,另一端与内部电路4电连接。每个输入端子1都对应一个保护开关,当输入端子1没有接入导线时,断开其对应的保护开关,使其断开与内部电路4的连接,防止光伏逆变器正常工作时,悬空的输入端子1因本身带有的强电引起的误触电。
作为一种可实施方式,安全保护开关装置3固定在内部电路4的主板上。
安全保护开关装置3固定在内部电路的主板上,安全保护开关装置3可以焊接在内部电路的主板上,也可以以插接件等方式电连接在内部电路4的主板上,防止其随便移动带来的电路故障。
作为一种可实施方式,还包括控制箱5,内部电路4和安全保护开关装置3设置在控制箱5内。
内部电路4和安全保护开关装置3设置在控制箱5中,既能防止内部电路4和安全保护开关装置3带来的安全故障,又能保证光伏逆变器的整洁美观。
作为一种可实施方式,安全保护开关装置3固定在控制箱5的侧壁上。
安全保护开关装置3可通过螺钉或螺栓固定在控制箱5的侧壁上,既方便实施者操作,又能防止其随意移动。
作为一种可实施方式,保护开关为闸刀式开关、按键式开关或拨动式开关。
作为一种可实施方式,保护开关为具有通断作用的短路块、短路帽或卡簧式通断结构。
值得说明的是,保护开关不限于上述实施例中的开关和结构,还可以为其他具有通断作用的结构。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。

Claims (8)

  1. 一种光伏逆变器的保护电路,所述光伏逆变器包括输入端子、输出端子和内部电路,所述输入端子和所述输出端子分别与所述内部电路电连接,其特征在于:
    所述保护电路包括安全保护开关装置;
    所述输入端子和所述内部电路通过所述安全保护开关装置电连接;
    所述安全保护开关装置包括多个并联的保护开关,每个所述输入端子对应一个所述保护开关。
  2. 根据权利要求1所述的光伏逆变器的保护电路,其特征在于,所述保护开关的数量与所述输入端子的数量相同,且一一对应。
  3. 根据权利要求2所述的光伏逆变器的保护电路,其特征在于,所述保护开关的数量为8个。
  4. 根据权利要求1所述的光伏逆变器的保护电路,其特征在于,所述安全保护开关装置固定在所述内部电路的主板上。
  5. 根据权利要求1所述的光伏逆变器的保护电路,其特征在于,还包括控制箱;
    所述内部电路和所述安全保护开关装置设置在所述控制箱内。
  6. 根据权利要求5所述的光伏逆变器的保护电路,其特征在于,所述安全保护开关装置固定在所述控制箱的侧壁上。
  7. 根据权利要求1至6任一项所述的光伏逆变器的保护电路,其特征在于,所述保护开关为闸刀式开关、按键式开关或拨动式开关。
  8. 根据权利要求1至6任一项所述的光伏逆变器的保护电路,其特征在于,所述保护开关为具有通断作用的短路块、短路帽或卡簧式通断结构。
PCT/CN2015/083275 2014-07-04 2015-07-03 光伏逆变器的保护电路 WO2016000658A1 (zh)

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CN201410316978.9 2014-07-04
CN201410316978.9A CN104113222A (zh) 2014-07-04 2014-07-04 光伏逆变器的保护电路

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