CN112467705A - Lightning protection device and inverter - Google Patents
Lightning protection device and inverter Download PDFInfo
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- CN112467705A CN112467705A CN201910841661.XA CN201910841661A CN112467705A CN 112467705 A CN112467705 A CN 112467705A CN 201910841661 A CN201910841661 A CN 201910841661A CN 112467705 A CN112467705 A CN 112467705A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- 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
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- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention provides a lightning protection device and an inverter, wherein the lightning protection device comprises a first overvoltage protector and a second overvoltage protector which are connected between a protected line and the ground in series, and the first overvoltage protector is connected with the protected line and the second overvoltage protector is grounded. Moreover, the lightning protection device also comprises a voltage regulating circuit, and the voltage regulating circuit at least comprises a first voltage dividing circuit connected in parallel at two ends of the second overvoltage protector. When the lightning protection device is in a normal working condition, the first voltage division circuit is used for adjusting the voltage drop on the first overvoltage protector or the second overvoltage protector. The voltage drop on the second overvoltage protector (or the first overvoltage protector) is reduced by adjusting the impedance value of the first voltage division circuit, so that the requirement on the voltage resistance of the second overvoltage protector (or the first overvoltage protector) is reduced, and the hardware cost of the lightning protection device is further reduced.
Description
Technical Field
The invention belongs to the technical field of lightning protection, and particularly relates to a lightning protection device and an inverter.
Background
At present, a lightning protection device usually adopts a mode of combining a metal-oxide varistor (MOV) and a GAS discharge tube (GAS), because the equivalent impedance of the MOV is about tens of mega ohms, and the equivalent impedance of the GAS discharge tube is very large, usually reaching to giga ohms, the impedance of the GAS discharge tube is far greater than that of the MOV, the voltage division is higher according to the higher impedance in a series circuit, most of voltage of a protected circuit is borne by the GAS discharge tube under normal conditions, especially in a high-voltage system, therefore, the GAS discharge tube with very high voltage resistance needs to be selected, but the GAS discharge tube with large voltage resistance in the market is very few, and the cost is very high.
Disclosure of Invention
In view of the above, the present invention is directed to a lightning protection device and an inverter, so as to reduce the requirement for the voltage endurance of the lightning protection device. The adopted specific technical scheme is as follows:
in a first aspect, the present invention provides a lightning protection device, including: the overvoltage protection circuit comprises a first overvoltage protector, a second overvoltage protector and a voltage regulating circuit;
the first overvoltage protector and the second overvoltage protector are connected between a protected line and the ground in series, the first overvoltage protector is connected with the protected line, and the second overvoltage protector is grounded;
the voltage regulating circuit comprises a first voltage dividing circuit, the first voltage dividing circuit is connected in parallel to two ends of the second overvoltage protector, and the first voltage dividing circuit is used for adjusting the voltage drop of the first overvoltage protector or the voltage drop of the second overvoltage protector.
In one possible implementation, an equivalent impedance of the first voltage divider circuit is less than or equal to an equivalent impedance of the first overvoltage protector, wherein the equivalent impedance of the first overvoltage protector is less than the equivalent impedance of the second overvoltage protector;
alternatively, the first and second electrodes may be,
the equivalent impedance of the first voltage division circuit is larger than that of the first overvoltage protector and smaller than that of the second overvoltage protector.
In one possible implementation, the first voltage dividing circuit is a chip resistor or a piezoresistor.
In one possible implementation, the protected line includes at least two lines;
the first overvoltage protector comprises at least two first overvoltage protection devices, and the number of the first overvoltage protection devices is the same as that of the protected lines; the second overvoltage protector comprises a second overvoltage protection device;
one end of each first overvoltage protection device is connected with different protected lines, the other end of each first overvoltage protection device is connected with one end of the second overvoltage protection device, and the other end of the second overvoltage protection device is grounded.
In one possible implementation, the protected line is at least one of a dc input bus and an ac output phase line of the inverter.
In a possible implementation manner, the voltage regulating circuit further includes a second voltage dividing circuit, where the second voltage dividing circuit includes voltage dividing devices equal in number to the number of protected lines;
one end of each voltage division device is connected with a protected line which is different from each other, and the other end of each voltage division device is connected with a common point of the first overvoltage protector and the second overvoltage protector.
In a possible implementation manner, the voltage dividing device in the second voltage dividing circuit is a switch type overvoltage protection device or a voltage limiting type overvoltage protection device.
In a possible implementation, the first overvoltage protector comprises a switching type overvoltage protection device or a voltage limiting type overvoltage protection device.
In a second aspect, the present invention further provides an inverter, including an inverter module and a lightning protection device connected to the inverter module, where the lightning protection device is provided in any one of the possible implementation manners of the first aspect.
In one possible implementation, the lightning protection device includes: a first lightning protection device and a second lightning protection device;
the first lightning protection device is connected with a direct current input bus of the inverter module;
and the second lightning protection device is connected with an alternating current output phase line of the inversion module.
The lightning protection device provided by the invention comprises a first overvoltage protector and a second overvoltage protector which are connected in series between a protected line and the ground, wherein the first overvoltage protector is connected with the protected line, and the second overvoltage protector is grounded. Moreover, the lightning protection device also comprises a voltage regulating circuit, and the voltage regulating circuit at least comprises a first voltage dividing circuit connected in parallel at two ends of the second overvoltage protector. When the lightning protection device is in a normal working condition, the first voltage division circuit is used for adjusting the voltage drop on the first overvoltage protector or the second overvoltage protector. The voltage drop on the second overvoltage protector (or the first overvoltage protector) is reduced by adjusting the impedance value of the first voltage division circuit, so that the requirement on the voltage resistance of the second overvoltage protector (or the first overvoltage protector) is reduced, and the hardware cost of the lightning protection device is further reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a lightning protection device according to the present invention;
FIG. 2 is a schematic structural diagram of another lightning protection device provided by the present invention;
fig. 3 is a schematic structural diagram of a lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 4 is a schematic structural diagram of another lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 5 is a schematic structural diagram of another lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 6 is a schematic structural diagram of a further lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 7 is a schematic structural diagram of another lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 8 is a schematic structural diagram of another lightning protection device applied to a dc input side of an inverter according to the present invention;
fig. 9 is a schematic structural diagram of a lightning protection device applied to an ac output side of an inverter according to the present invention;
fig. 10 is a schematic structural diagram of another lightning protection device applied to an ac output side of an inverter according to the present invention;
fig. 11 is a schematic structural diagram of an inverter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a lightning protection device provided by the present invention is shown, and as shown in fig. 1, the lightning protection device includes a first overvoltage protector (i.e., SPD1), a second overvoltage protector (i.e., SPD2), and a voltage regulating circuit.
SPD1 and SPD2 are connected in series between the protected line and ground (i.e., PE), SPD1 is connected to the protected line, and SPD2 is connected to the PE.
The voltage regulating circuit at least comprises a first voltage dividing circuit which is connected in parallel with two ends of the SPD2 and is used for regulating the voltage drop of the first overvoltage protector or the second overvoltage protector.
In one application scenario, the SPD1 employs a voltage-limiting overvoltage protection device such as an MOV, the SPD2 employs a switching overvoltage protection device such as a GAS, the equivalent impedance of the MOV is in the M Ω level, the equivalent impedance of the GAS is in the G Ω level, and it can be seen that the equivalent impedance of the SPD1 is much smaller than that of the SPD 2.
In this application scenario, when the equivalent impedance of the first voltage-dividing circuit is less than or equal to the equivalent impedance of SPD1, the first voltage-dividing circuit is connected in parallel with SPD2, and the parallel impedance is less than the impedance of any one of the parallel branches, so that the parallel equivalent impedance of the first voltage-dividing circuit and SPD2 is much less than SPD 2. Since the equivalent impedance of SPD1 is not changed, the overall impedance in the lightning protection device is reduced, which leads to an increase in current in the overall circuit, and thus an increase in voltage drop across SPD1, and finally a reduction in voltage drop across SPD 2.
When the equivalent impedance of the first voltage division circuit is greater than that of the SPD1, the parallel equivalent impedance of the first voltage division circuit and the SPD2 can be greater than that of the SPD1, and at this time, the voltage drop of the first voltage division circuit is greater than that of the SPD1, so that the requirement on the voltage withstanding performance of the SPD1 can be reduced.
It should be noted that in other embodiments of the present invention, SPD2 may employ a voltage limiting type over-voltage protection device, such as an MOV.
A switching type overvoltage protection device is one in which the switching type overvoltage protection device is turned on when the voltage in the circuit exceeds its breakdown voltage, and the voltage drop across it is substantially 0, for example, a gas discharge tube is one type of switching type overvoltage protection device.
The voltage limiting overvoltage protection device clamps the voltage at a certain voltage limit value when the voltage at two ends of the voltage limiting overvoltage protection device reaches the withstand voltage of the voltage limiting overvoltage protection device. For example, MOVs belong to voltage limiting overvoltage protection devices.
In this embodiment, as shown in fig. 1, the voltage regulator circuit includes only the first voltage divider circuit, the first voltage divider circuit is connected in parallel to two ends of the SPD2, and the voltage drop across the SPD2 or the SPD1 can be effectively reduced by reasonably configuring the equivalent impedance of the first voltage divider circuit with reference to the equivalent impedance of the SPD 1.
In another possible implementation manner of the present invention, as shown in fig. 2, the voltage regulating circuit includes a first voltage dividing circuit and a second voltage dividing circuit, the second voltage dividing circuit is connected in parallel to two ends of SPD1, and the second voltage dividing circuit is connected in parallel to two ends of SPD 2.
The equivalent impedance of the first voltage division circuit is reasonably configured by referring to the equivalent impedance of the second voltage division circuit, and the voltage drop of the SPD2 or the SPD1 is effectively reduced.
It should be noted that, the first voltage dividing circuit and the second voltage dividing circuit may both adopt a chip resistor or a voltage limiting type overvoltage protection device (e.g., MOV), and are not limited herein.
The lightning protection device provided by the embodiment is additionally provided with the voltage regulating circuit, and the voltage regulating circuit at least comprises a first voltage dividing circuit connected to two ends of the second overvoltage protector in parallel. When the lightning protection device is in a normal working condition, the first voltage division circuit is used for adjusting the voltage drop on the first overvoltage protector or the second overvoltage protector. The voltage drop on the second overvoltage protector (or the first overvoltage protector) is reduced by adjusting the impedance value of the first voltage division circuit, so that the requirement on the voltage resistance of the second overvoltage protector (or the first overvoltage protector) is reduced, and the hardware cost of the lightning protection device is further reduced.
In a photovoltaic power generation system, an inverter is a core device, and the stability of the inverter directly affects the operation stability of the whole power grid. Therefore, lightning protection is one of the important protection functions to be implemented by the inverter. The direct current input side and the alternating current output side of the inverter need to be provided with lightning protection devices.
The following description will first be made by taking, as an example, a lightning protection device provided on a dc input side of an inverter:
referring to fig. 3, a schematic structural diagram of a lightning protection device applied to a dc input side of an inverter according to the present invention is shown, where the lightning protection device is applied to a dc input end of the inverter, that is, a protected line is a dc bus connected to the dc input end of the inverter.
As shown in fig. 3, in the present application scenario, the dc bus to which the inverter is connected includes a positive dc bus and a negative dc bus. The SPD1 includes two first overvoltage protection devices, MOV1 and MOV2 respectively; also, SPD2 is a GAS discharge tube GAS.
One end of the MOV1 is connected to the positive DC bus PV +, the other end of the MOV1 is connected to one end of the GAS, and the other end of the GAS is connected to the PE terminal.
One end of the MOV2 is connected to the negative DC bus PV-, and the other end of the MOV2 is connected to the common terminal of GAS and MOV 1.
The first voltage divider circuit includes a resistor R connected in parallel across the GAS.
In one application, where it is desirable to select a GAS with a very low breakdown voltage, the resistance value of R can be configured to be less than or equal to the self-impedance of MOV1 or MOV 2.
The MOV has self-impedance of M omega level, so the resistance of R is M omega level; and the impedance of GAS is in G omega level, and the parallel equivalent impedance of R and GAS after being connected in parallel is smaller than the resistance value of R. The total impedance in the circuit is reduced, under the condition of a certain voltage, the current in the circuit becomes larger, and the impedance of the MOV1 or the MOV2 is not changed, so that the voltage drop on the MOV1 or the MOV2 is increased; and because the voltage is constant, the voltage drop on the GAS is small. In summary, the GAS with the smaller breakdown voltage can be selected to ensure that the GAS is not broken down under normal operating conditions.
In another application scenario, it is desirable to select an MOV with a small withstand voltage, and the resistance value of R may be configured to be larger than the self-impedance of MOV1 or MOV2, so that the voltage across MOV1 (or MOV2) is lower than the voltage across GAS, and at this time, an MOV with a small withstand voltage may be selected, and it is certainly necessary to ensure that GAS is not broken down under normal operating conditions.
Referring to fig. 4, a schematic structural diagram of another lightning protection device is shown, which is different from the embodiment shown in fig. 3 in that: the voltage regulating circuit comprises a first voltage dividing circuit and a second voltage dividing circuit, wherein the first voltage dividing circuit is R3, and the second voltage dividing circuit is R1 and R2.
As shown in fig. 4, R1 is connected in parallel across MOV1, R2 is connected in parallel across MOV2, and R3 is connected in parallel across GAS.
In the present embodiment, the resistance value of R3 can be configured with reference to the resistance values of R1 and R2;
since R1 is in parallel with MOV1, the voltage drop across R1 is the same as the voltage drop across MOV 1; similarly, the voltage across R2 is the same as the voltage across MOV 2.
If the impedance of R3 is configured to be less than or equal to the impedance of R1 (or R2), it can be achieved that the voltage across R3 is less than or equal to the voltage across R1 (or R2). Also, since R3 is connected in parallel with the GAS, the voltage across R3 is equal to the voltage across the GAS, so the voltage across the GAS is less than or equal to the voltage across MOV1 (or MOV 2). At the moment, the GAS with small breakdown voltage can be selected to ensure that the GAS cannot be broken down under the normal working condition.
Similarly, if the impedance of R3 is configured to be greater than the impedance of R1 (or R2), the voltage across MOV1 (or MOV2) can be smaller than the voltage across GAS, so an MOV with a smaller withstand voltage can be selected, and it is necessary to ensure that GAS will not break down under normal operating conditions.
Further, in the lightning protection device shown in fig. 4, the impedances of R1 and R2 may be configured to be smaller than the self-impedance of MOV2 or MOV 2. Therefore, R3 may be selected to have a lower impedance value, thereby further reducing cost.
In addition, the lightning protection device composed of MOV + GAS shown in fig. 3 and fig. 4 has a residual voltage of substantially 0V on GAS after lightning conduction, and only the residual voltage formed by MOV1 or MOV2 exists in the whole loop, so that the residual voltage in the whole loop of the lightning protection device composed of MOV + GAS is lower than that of the lightning protection device composed of MOV, thereby reducing the requirement of withstand voltage of the circuit at the rear stage.
In another embodiment of the present invention, the SPD2 in the lightning protection apparatus shown in fig. 3 may also be implemented by a voltage limiting type overvoltage protection device, as shown in fig. 5, the SPD2 is implemented by MOV; the working process of the whole lightning protection device is the same as that of the embodiment shown in fig. 3, and is not described herein again.
In another embodiment of the present invention, the SPD2 in the lightning protection device shown in fig. 4 may also be implemented by a voltage limiting type overvoltage protection device, as shown in fig. 6, the SPD2 is implemented by an MOV, and the rest is the same as the embodiment shown in fig. 4, and will not be described here again.
In other embodiments of the present invention, the lightning protection device is applied to the input of an inverter comprising multiple inputs, the inverter comprising a plurality of positive dc buses and a negative dc bus. In this application scenario, the SPD1 includes a plurality of first overvoltage protection devices, and the number of the first overvoltage protection devices is the same as the number of the dc buses of the inverter, where the first overvoltage protection devices may be voltage-limiting overvoltage protection devices, such as MOVs.
As shown in fig. 7, one end of the MOV1 is connected to the positive dc bus PV1+, and the other end of the MOV1 is connected to one end of the GAS; one end of the MOV2 is connected with the positive direct current bus PV2+, and the other end of the MOV2 is connected with one end of the GAS; by analogy, one end of the MOVin is connected with the positive direct current bus PVn +, and one end of the MOVin +1 is connected with the negative direct current bus PV-.
In one embodiment of the invention, the voltage regulation circuit includes only a first voltage divider circuit connected in parallel across SPD 2.
The first voltage division circuit may be implemented by a chip resistor, or may be implemented by a voltage limiting protection device.
The SPD2 in the lightning protection device shown in fig. 7 is implemented by GAS, and in other embodiments, the SPD2 may also be implemented by other switch type overvoltage protection devices or voltage limiting type overvoltage protection devices, which are not limited herein.
In another embodiment of the present invention, as shown in fig. 8, the voltage regulating circuit may further include a second voltage dividing circuit on the basis of the first voltage dividing circuit, and the second voltage dividing circuit includes the same number of voltage dividing devices as the number of lines to be protected, and each voltage dividing device is connected in parallel with one MOV.
As shown in fig. 8, R1 is connected in parallel across MOV1, and so on, Rn is connected in parallel across MOVn and Rn +1 is connected in parallel across MOVn + 1. The second voltage division circuit comprises Rn +2, and the Rn +2 is connected in parallel across the SPD 2.
The working process of the lightning protection device shown in this embodiment is the same as that of the lightning protection device shown in fig. 4, and is not described herein again.
The alternating current output side of the inverter also needs to be provided with a lightning protection device, and in the application scene, the protected line is an alternating current output phase line of the inverter.
Referring to fig. 9, a schematic structural diagram of a lightning protection device on an ac output side of an inverter according to the present invention is shown.
As shown in fig. 9, the ac output phase lines of the inverter are L1, L2, and L3, i.e., the protected lines are L1, L2, and L3, respectively.
The SPD1 includes three first overvoltage protection devices, MOV1, MOV2 and MOV 3; SPD2 is GAS. One end of the MOV1 is connected to L1, the other end of the MOV1 is connected to one end of the GAS, and the other end of the GAS is grounded; MOV2 is connected between L2 and GAS and MOV3 is connected between L3 and GAS.
In this embodiment, the voltage regulating circuit includes a first voltage dividing circuit connected in parallel across SPD 2.
The working process of the lightning protection device provided in this embodiment is the same as the working process of the lightning protection device shown in fig. 3, and is not described here again.
The voltage regulating circuit in the lightning protection device shown in fig. 9 may further include a second voltage dividing circuit on the basis of the first voltage dividing circuit, so as to obtain the lightning protection device shown in fig. 10.
As shown in fig. 10, the voltage regulating circuit in the lightning protection device includes a first voltage dividing circuit and a second voltage dividing circuit, where the second voltage dividing circuit includes R1, R2, and R3, and the first voltage dividing circuit includes R4.
R1 is connected in parallel with MOV1, R2 is connected in parallel with MOV2, R3 is connected in parallel with MOV3, and R4 is connected in parallel with SPD 2.
The R4 impedance is configured by referring to the R1, R2 or R3 impedance values, and the specific configuration process is the same as that of the embodiment shown in fig. 4, which is not repeated herein.
In other embodiments of the present invention, SPD2 of the embodiment shown in fig. 9 and 10 may also be implemented with other switching type overvoltage protection devices, or with voltage limiting type overvoltage protection devices, which are not limited herein.
On the other hand, the invention also provides an inverter provided with the lightning protection device provided by the embodiment.
Referring to fig. 11, a schematic structural diagram of an inverter according to the present invention is shown, and as shown in fig. 11, the inverter includes an inverter module, a first lightning protection device, and a second lightning protection device.
The first lightning protection device is connected with the direct current input end of the inversion module, and the second lightning protection device is connected with the alternating current output end of the inversion module.
The dc input terminal of the inverter module shown in fig. 11 includes a positive input terminal PV + and a negative input terminal PV —, in this case, the first lightning protection device may be any one of the lightning protection devices shown in fig. 3 to 6.
In another application scenario, the dc input end of the inverter module includes n positive input ends and one negative input end, and in such an application scenario, the first lightning protection device may adopt any one of the lightning protection devices with the structures shown in fig. 7 to 8 and other possible structures, which is not described in detail herein.
The second lightning protection means may be any one of the lightning protection means shown in the structures of fig. 9-10 and other possible structures.
The dc-to-ac converter that this embodiment provided all is provided with foretell lightning protection device at the direct current input of contravariant module and exchanges the output, and this kind of lightning protection device increases the voltage regulator circuit in order to adjust the voltage at first overvoltage protector or second overvoltage protector both ends, reduces first overvoltage protector or second overvoltage protector's voltage endurance requirement to the hardware cost of lightning protection device has been reduced, and then has reduced the hardware cost of dc-to-ac converter.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The steps in the method of the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs.
The device and the modules and sub-modules in the terminal in the embodiments of the present application can be combined, divided and deleted according to actual needs.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, the division of a module or a sub-module is only one logical division, and there may be other divisions when the terminal is actually implemented, for example, a plurality of sub-modules or modules may be combined or integrated into another module, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules or sub-modules described as separate parts may or may not be physically separate, and parts that are modules or sub-modules may or may not be physical modules or sub-modules, may be located in one place, or may be distributed over a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional module or sub-module in the embodiments of the present application may be integrated into one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated into one module. The integrated modules or sub-modules may be implemented in the form of hardware, or may be implemented in the form of software functional modules or sub-modules.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A lightning protection device, comprising: the overvoltage protection circuit comprises a first overvoltage protector, a second overvoltage protector and a voltage regulating circuit;
the first overvoltage protector and the second overvoltage protector are connected between a protected line and the ground in series, the first overvoltage protector is connected with the protected line, and the second overvoltage protector is grounded;
the voltage regulating circuit comprises a first voltage dividing circuit, the first voltage dividing circuit is connected in parallel to two ends of the second overvoltage protector, and the first voltage dividing circuit is used for adjusting the voltage drop of the first overvoltage protector or the voltage drop of the second overvoltage protector.
2. The lightning protection device of claim 1, wherein:
the equivalent impedance of the first voltage division circuit is smaller than or equal to the equivalent impedance of the first overvoltage protector, wherein the equivalent impedance of the first overvoltage protector is smaller than the equivalent impedance of the second overvoltage protector;
alternatively, the first and second electrodes may be,
the equivalent impedance of the first voltage division circuit is larger than that of the first overvoltage protector and smaller than that of the second overvoltage protector.
3. The lightning protection device of claim 1 or 2, wherein the first voltage divider circuit is a chip resistor or a varistor.
4. The lightning protection device of claim 1, wherein the protected line comprises at least two lines;
the first overvoltage protector comprises at least two first overvoltage protection devices, and the number of the first overvoltage protection devices is the same as that of the protected lines; the second overvoltage protector comprises a second overvoltage protection device;
one end of each first overvoltage protection device is connected with different protected lines, the other end of each first overvoltage protection device is connected with one end of the second overvoltage protection device, and the other end of the second overvoltage protection device is grounded.
5. The lightning protection device of claim 4, wherein the line being protected is at least one of a DC input bus and an AC output phase line of an inverter.
6. The lightning protection device according to 1, 2, 4 or 5, wherein the voltage regulating circuit further comprises a second voltage dividing circuit, wherein the second voltage dividing circuit comprises voltage dividing devices with the number equal to that of the protected lines;
one end of each voltage division device is connected with a protected line which is different from each other, and the other end of each voltage division device is connected with a common point of the first overvoltage protector and the second overvoltage protector.
7. The lightning protection device according to claim 6, wherein the voltage dividing device in the second voltage dividing circuit is a switch type overvoltage protection device or a voltage limiting type overvoltage protection device.
8. Lightning protection device according to claim 1, 2, 4 or 5, characterized in that said first overvoltage protector comprises a switching type overvoltage protection device or a voltage limiting type overvoltage protection device.
9. An inverter, characterized by comprising an inverter module and the lightning protection device of any one of claims 1 to 8 connected to the inverter module.
10. The inverter of claim 9, wherein the lightning protection device comprises: a first lightning protection device and a second lightning protection device;
the first lightning protection device is connected with a direct current input bus of the inverter module;
and the second lightning protection device is connected with an alternating current output phase line of the inversion module.
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| CN201910841661.XA CN112467705A (en) | 2019-09-06 | 2019-09-06 | Lightning protection device and inverter |
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| CN201910841661.XA CN112467705A (en) | 2019-09-06 | 2019-09-06 | Lightning protection device and inverter |
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| CN112467705A true CN112467705A (en) | 2021-03-09 |
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