Inverter

Abstract

Provided in the present application is an inverter. The inverter is disposed on an electric energy transmission line from a power generation device to an electric end. The inverter comprises a double-contact relay, wherein the double-contact relay comprises: a main contact, which is disposed on the electric energy transmission line; an auxiliary contact linked with the main contact; and an electromagnetic coil, which is used for generating a magnetic field when being energized, so as to drive the main contact to act, thereby changing the on-off state of the electric energy transmission line and driving in a linked manner the auxiliary contact to act.

Description

An inverter

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202323599580.4 and title “A Kind of Inverter” filed with the Patent Office of China on December 27, 2023. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of inverters, and in particular to an inverter. Background Art

[0004] Conventional technology uses a single-contact relay in the inverter. This requires checking for relay failures when starting the inverter and real-time monitoring when connecting to and disconnecting from the grid. In the event of a grid failure, the inverter must be able to power off-grid loads. Maintenance personnel inspecting the grid must constantly check for adhesion in the grid-connected inverter to ensure their safety. However, a single-contact relay detects a fault by measuring the voltage across the relay. However, the voltage across the neutral and ground wires of a relay is always zero, making it impossible to accurately determine if the relay is faulty.

[0005] Summary of the Invention

[0006] In view of this, the purpose of this application is to provide an inverter that can set a double-contact relay on the power transmission line from the power generation equipment to the power consumption end, so that when the main contact of the relay is actuated, it will drive the auxiliary contact to perform an action, thereby determining whether the relay is faulty by detecting the action of the auxiliary contact, thereby solving the technical problem in the prior art that the relay on the neutral line and the ground line cannot detect faults, and achieving the technical effect of improving the safety of the inverter.

[0007] In a first aspect, an embodiment of the present application provides an inverter, which is arranged on an electric energy transmission line from a power generation device to a power consumption end, and includes a double-contact relay, wherein the double-contact relay includes: a main contact, which is arranged on the electric energy transmission line; an auxiliary contact linked to the main contact; and an electromagnetic coil, which is used to generate a magnetic field when power is turned on to drive the main contact to operate, so as to change the on / off state of the electric energy transmission line and link the auxiliary contact to operate.

[0008] Optionally, the inverter further includes an identification module, wherein the identification module includes: a first pin, connected to the auxiliary contact; a second pin, connected to the electromagnetic coil, for controlling the power-on state of the electromagnetic coil; wherein the identification module is configured to determine whether the level signal of the auxiliary contact is correct based on the power-on state of the electromagnetic coil, so as to perform fault detection on the double-contact relay.

[0009] Optionally, the power-consuming end includes AC power and power-consuming equipment, the power transmission line includes a first power transmission line and a second power transmission line, and a preset connection point is set on the connecting line between the output end of the power generation equipment and the input end of the AC power. The first power transmission line refers to the power transmission line from the output end of the power generation equipment to the preset connection point, and the second power transmission line refers to the power transmission line from the preset connection point to the input end of the power-consuming equipment. The input end of the power-consuming equipment is used to connect to the preset connection point.

[0010] Optionally, the double-contact relay includes an inverter double-contact relay and / or a grid-connected double-contact relay, wherein the inverter double-contact relay is arranged on the first power transmission line, and the grid-connected double-contact relay is arranged on the second power transmission line, so that when the inverter double-contact relay is disconnected, the power generation equipment is controlled to stop transmitting power, and when only the grid-connected double-contact relay is disconnected, the power generation equipment is controlled to transmit power only to the power-consuming equipment.

[0011] Optionally, the preset connection point includes a first preset connection point and a second preset connection point, the first preset connection point is a point on the connection line between the positive output pin of the power generating device and the first live wire input pin of the mains, the second preset connection point is a point on the connection line between the negative output pin of the power generating device and the first neutral wire input pin of the mains, the first power transmission line includes a first live wire power transmission line and a first neutral wire power transmission line, the first live wire power transmission line refers to the power transmission line from the positive output pin of the power generating device to the first preset connection point, the first neutral wire power transmission line refers to the power transmission line from the negative output pin of the power generating device to the second preset connection point, the second power transmission line includes a second live wire power transmission line and a second neutral wire power transmission line, the second live wire power transmission line refers to the power transmission line from the first preset connection point to the first live wire input pin of the mains, and the second neutral wire power transmission line refers to the power transmission line from the second preset connection point to the first neutral wire input pin of the mains.

[0012] Optionally, the inverter double-contact relay includes a first inverter double-contact relay and a second inverter double-contact relay, wherein the first inverter double-contact relay is arranged on one of the first live wire power transmission line and the first neutral wire power transmission line, and the second inverter double-contact relay is arranged on the other of the first live wire power transmission line and the first neutral wire power transmission line.

[0013] Optionally, the grid-connected double-contact relay includes a first grid-connected double-contact relay and a second grid-connected double-contact relay, wherein the first grid-connected double-contact relay is arranged on one of the second live wire power transmission line and the second neutral wire power transmission line, and the second grid-connected double-contact relay is arranged on the other of the second live wire power transmission line and the second neutral wire power transmission line.

[0014] Optionally, the power transmission circuit also includes a third power transmission circuit, which is used to connect the ground wire and the ground input pin of the electrical equipment. The double-contact relay also includes a ground double-contact relay, which is arranged on the third power transmission circuit.

[0015] Optionally, the inverter further includes a first connection port, a second connection port, and a third connection port arranged on the packaging shell of the inverter, wherein the first connection port is used to connect to the output end of the power generation equipment, the second connection port is used to connect to the input end of the mains power, and the preset connection point leads to the third connection port for connecting to the input end of the power-consuming equipment.

[0016] Optionally, the first connection port includes a first connection pin and a second connection pin, the first connection pin is used to connect one of the positive output pin and the negative output pin of the power generating device, the second connection pin is used to connect the other of the positive output pin and the negative output pin of the power generating device, the second connection port includes a third connection pin and a fourth connection pin, the third connection pin is used to connect one of the first live wire input pin and the first neutral wire input pin of the mains power, the fourth connection pin is used to connect the other of the first live wire input pin and the first neutral wire input pin of the mains power, the third connection port includes a fifth connection pin, a sixth connection pin and a seventh connection pin, the fifth connection pin is used to connect one of the second live wire input pin and the second neutral wire input pin of the power consuming device, the sixth connection pin is used to connect the other of the second live wire input pin and the second neutral wire input pin of the power consuming device, and the seventh connection pin is used to connect the ground connection pin of the power consuming device.

[0017] An inverter provided in an embodiment of the present application is arranged on an electric energy transmission line from a power generation device to a power consumption end. The inverter includes a double-contact relay, wherein the double-contact relay includes: a main contact arranged on the electric energy transmission line; an auxiliary contact linked to the main contact; and an electromagnetic coil for generating a magnetic field when energized to drive the main contact to operate, thereby changing the on / off state of the electric energy transmission line and linking the auxiliary contact to operate. By arranging the double-contact relay on the electric energy transmission line from the power generation device to the power consumption end, when the main contact of the relay operates, the auxiliary contact will also operate, thereby determining whether the relay is faulty by detecting the operation of the auxiliary contact. This solves the technical problem in the prior art that relays on the neutral line and ground line cannot detect faults, thereby achieving the technical effect of improving the safety of the inverter.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] FIG1 shows one of the structural schematic diagrams of an inverter provided in an embodiment of the present application.

[0021] FIG2 shows a second structural schematic diagram of an inverter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work falls within the scope of protection of the present application.

[0023] In the prior art, in order to ensure electricity safety, it is necessary to detect whether there is a fault in the relay in the inverter. The fault condition is determined by detecting the voltage on both sides of the relay. However, the voltage on both sides of the relay set on the neutral line and the ground line is continuously zero, so the fault condition of the relay set on the neutral line and the ground line cannot be determined.

[0024] To address the above-mentioned issues, embodiments of the present application provide an inverter. By disposing a dual-contact relay on the power transmission line from the power generation equipment to the power consumption end, when the main contact of the relay actuates, it drives the auxiliary contact to actuate. Thus, by detecting the actuation of the auxiliary contact, it is possible to determine whether the relay is faulty. This solves the technical problem in the prior art where relays on the neutral line and the ground line cannot detect faults, thereby achieving the technical effect of improving the safety of the inverter. The specific details are as follows:

[0025] Please refer to Figure 1, which is a schematic diagram of the structure of an inverter provided in an embodiment of the present application. As shown in Figure 1, the inverter provided in an embodiment of the present application includes an inverter 101 disposed on an electric energy transmission line from a power generation device 102 to a power consumption end 103. The inverter includes a double-contact relay 1011, wherein the double-contact relay includes: a main contact disposed on the electric energy transmission line; an auxiliary contact linked to the main contact; and an electromagnetic coil for generating a magnetic field when power is applied to drive the main contact to operate, thereby changing the on / off state of the electric energy transmission line and linking the auxiliary contact to operate.

[0026] That is to say, the inverter is used to transmit the electric energy generated by the power generation device to the power-consuming equipment, and a double-contact relay is set in the inverter, and the main contacts are set on the power transmission line from the power generation equipment to the power-consuming end. The main contacts are driven by the electromagnetic coil, so that the auxiliary contacts linked with the main contacts will produce corresponding actions.

[0027] The main contact and the auxiliary contact can perform the same action. For example, if the main contact is a normally closed contact, then when the main contact opens, the auxiliary contact also opens. The main contact and the auxiliary contact can also perform different actions. For example, if the main contact is a normally closed contact, then when the main contact opens, the auxiliary contact closes. In other words, the auxiliary contact will produce a corresponding action when the main contact moves.

[0028] The inverter also includes an identification module, wherein the identification module includes: a first pin, connected to the auxiliary contact; a second pin, connected to the electromagnetic coil, for controlling the power-on state of the electromagnetic coil; wherein the identification module is configured to determine whether the level signal of the auxiliary contact is correct based on the power-on state of the electromagnetic coil, so as to perform fault detection on the double-contact relay.

[0029] That is to say, the second pin is used to control whether the electromagnetic coil is energized, and then the main contact performs an action when the electromagnetic coil is energized, thereby driving the auxiliary contact to act, and then the level signal of the auxiliary contact is determined through the first pin, that is, the corresponding level of the auxiliary contact when the electromagnetic coil is energized or not is determined, thereby determining whether the auxiliary contact performs the corresponding action, so as to determine the state of the relay.

[0030] That is to say, in the event of a relay failure, the main contacts cannot operate accordingly according to the power supply status of the electromagnetic coil, and thus cannot drive the auxiliary contacts to operate, which in turn makes it impossible to change the on and off state of the low-voltage coil connected to the auxiliary contacts, resulting in the level signal of the auxiliary contacts unable to produce corresponding changes, and thus it can be determined whether the relay is faulty.

[0031] Please refer to Figure 2, which is a second schematic diagram of the structure of an inverter provided in an embodiment of the present application. As shown in Figure 2, the power consumption end includes a mains 1031 and a power consumption device 1032, and the power transmission line includes a first power transmission line and a second power transmission line. A preset connection point is set on the connection line between the output end of the power generation device and the input end of the mains. The first power transmission line refers to the power transmission line from the output end of the power generation device to the preset connection point, and the second power transmission line refers to the power transmission line from the preset connection point to the input end of the power consumption device. The input end of the power consumption device is used to connect to the preset connection point.

[0032] The inverter connects the output of the power generation device to the input of the mains electricity. A power transmission line is extended from the power transmission line between the output of the power generation device and the input of the mains electricity to connect to the input of the power consumption device, thereby enabling the inverter to transmit the electric energy generated by the power generation device to the mains electricity and the power consumption device. Furthermore, the point where the power transmission line extending from the output of the power generation device to the input of the mains electricity is connected to the power consumption device is designated as a predetermined connection point. The predetermined connection point divides the power transmission line between the output of the power generation device and the input of the mains electricity into a first power transmission line and a second power transmission line.

[0033] The double-contact relay includes an inverter double-contact relay K1 and / or a grid-connected double-contact relay K2, wherein the inverter double-contact relay is arranged on the first power transmission line, and the grid-connected double-contact relay is arranged on the second power transmission line, so that when the inverter double-contact relay is disconnected, the power generation equipment is controlled to stop transmitting power, and when only the grid-connected double-contact relay is disconnected, the power generation equipment is controlled to transmit power only to the power-consuming equipment.

[0034] That is to say, when there is only the inverter double-contact relay, when the inverter double-contact relay is closed, the electric energy generated by the power generation equipment is transmitted to the mains and the power consumption equipment, and when the inverter double-contact relay is disconnected, the electric energy generated by the power generation equipment cannot be transmitted to the mains and the power consumption equipment; when there is only the grid-connected double-contact relay, when the grid-connected double-contact relay is closed, the electric energy generated by the power generation equipment is transmitted to the mains and the power consumption equipment, and when the grid-connected double-contact relay is disconnected, the electric energy generated by the power generation equipment is only transmitted to the power consumption equipment; when both the inverter double-contact relay and the grid-connected double-contact relay are set, when only the inverter double-contact relay is closed, the electric energy generated by the power generation equipment is only transmitted to the power consumption equipment, so that there is no electric energy transmission on the mains to facilitate maintenance of the mains, and when only the grid-connected double-contact relay is closed, the power generation equipment cannot output electric energy to the mains and the power consumption equipment, and when both the inverter double-contact relay and the grid-connected double-contact relay are closed, the electric energy generated by the power generation equipment is transmitted to the mains and the power consumption equipment.

[0035] The preset connection point includes a first preset connection point and a second preset connection point, the first preset connection point is a point on the connection line between the positive output pin of the power generating device and the first live wire input pin of the mains, the second preset connection point is a point on the connection line between the negative output pin of the power generating device and the first neutral wire input pin of the mains, the first power transmission line includes a first live wire power transmission line and a first neutral wire power transmission line, the first live wire power transmission line refers to the power transmission line from the positive output pin of the power generating device to the first preset connection point, the first neutral wire power transmission line refers to the power transmission line from the negative output pin of the power generating device to the second preset connection point, the second power transmission line includes a second live wire power transmission line and a second neutral wire power transmission line, the second live wire power transmission line refers to the power transmission line from the first preset connection point to the first live wire input pin of the mains, and the second neutral wire power transmission line refers to the power transmission line from the second preset connection point to the first neutral wire input pin of the mains.

[0036] The output end of the power generating device includes a positive output pin and a negative output pin, and the input end of the mains power includes a first live wire input pin and a first neutral wire input pin. The positive output pin of the power generating device is connected to the first live wire input pin of the mains power, and the negative output pin of the power generating device is connected to the first neutral wire input pin of the mains power. The first preset connection point is located on the connection line between the positive output pin of the power generating device and the first live wire input pin of the mains power, and the second preset connection point is located on the connection line between the negative output pin of the power generating device and the first neutral wire input pin of the mains power.

[0037] Furthermore, the first power transmission line includes a first live wire power transmission line from the positive output pin of the power generating device to the first preset connection point and a first neutral wire power transmission line from the negative output pin of the power generating device to the second preset connection point, and the second power transmission line includes a second live wire power transmission line from the first preset connection point to the first live wire input pin of the mains and a second neutral wire power transmission line from the second preset connection point to the first neutral wire input pin of the mains.

[0038] The electrical equipment includes a second live wire input pin and a second neutral wire input pin. An electric energy transmission line is led out from the first preset connection point and connected to the second live wire input pin, and an electric energy transmission line is led out from the second preset connection point and connected to the second neutral wire input pin.

[0039] The inverter double-contact relay K1 includes a first inverter double-contact relay K11 and a second inverter double-contact relay K12, wherein the first inverter double-contact relay is arranged on one of the first live wire power transmission line and the first neutral wire power transmission line, and the second inverter double-contact relay is arranged on the other of the first live wire power transmission line and the first neutral wire power transmission line.

[0040] The grid-connected double-contact relay K2 includes a first grid-connected double-contact relay K21 and a second grid-connected double-contact relay K22, wherein the first grid-connected double-contact relay is arranged on one of the second live wire power transmission line and the second neutral wire power transmission line, and the second grid-connected double-contact relay is arranged on the other of the second live wire power transmission line and the second neutral wire power transmission line.

[0041] That is, a double-contact relay is provided on each of the first live power transmission line and the first neutral power transmission line, serving as an inverter double-contact relay in the inverter. A double-contact relay is provided on each of the second live power transmission line and the second neutral power transmission line, serving as a grid-connected double-contact relay in the inverter.

[0042] The power transmission line also includes a third power transmission line, which is used to connect the ground wire PE and the ground input pin GND of the electrical equipment. The double-contact relay also includes a ground double-contact relay K3, which is arranged on the third power transmission line.

[0043] Among them, the input end of the electrical equipment also includes a ground input pin, which is used to connect the ground wire. Furthermore, a ground double-contact relay is set on the power transmission line between the ground wire and the ground input pin of the electrical equipment to detect the level signal of the auxiliary contact of the ground double-contact relay to determine the fault condition of the ground double-contact relay.

[0044] The inverter also includes a first connection port, a second connection port, and a third connection port arranged on the packaging shell of the inverter, wherein the first connection port is used to connect to the output end of the power generation equipment, the second connection port is used to connect to the input end of the mains power, and the preset connection point leads to the third connection port for connecting to the input end of the power-consuming equipment.

[0045] Specifically, the first connection port and the second connection port are connected, thereby connecting the output of the power generation device to the input of the mains. A third connection port is connected between the connection line between the first connection port and the second connection port, so that an energy transmission line is connected to the input of the power consumption device through the connection line between the output of the power generation device and the input of the mains. Furthermore, the power generated by the power generation device is transmitted to the power consumption device and the mains through the inverter.

[0046] The first connection port includes a first connection pin and a second connection pin, the first connection pin is used to connect one of the positive output pin and the negative output pin of the power generating device, and the second connection pin is used to connect the other of the positive output pin and the negative output pin of the power generating device. The second connection port includes a third connection pin and a fourth connection pin, the third connection pin is used to connect one of the first live wire input pin and the first neutral wire input pin of the mains power, and the fourth connection pin is used to connect the other of the first live wire input pin and the first neutral wire input pin of the mains power. The third connection port includes a fifth connection pin, a sixth connection pin and a seventh connection pin, the fifth connection pin is used to connect one of the second live wire input pin and the second neutral wire input pin of the power consuming device, the sixth connection pin is used to connect the other of the second live wire input pin and the second neutral wire input pin of the power consuming device, and the seventh connection pin is used to connect the ground connection pin of the power consuming device.

[0047] That is, the first connection pin and the second connection pin of the first connection port are respectively connected to the positive output pin and the negative output pin of the power generation device, so that the inverter can receive the electric energy generated by the power generation device. The third connection pin and the fourth connection pin of the second connection port are respectively connected to the first live input pin and the first neutral input pin of the mains, so that the mains can receive the electric energy generated by the power generation device. The connection pins in the first connection port and the connection pins of the second connection port are connected according to the corresponding polarity. The fifth connection pin, the sixth connection pin and the seventh connection pin of the third connection port are respectively connected to the second live input pin, the second neutral input pin and the ground connection pin of the power consumption device, so that the power consumption device can use the electric energy generated by the power generation device. Since the third connection port is drawn from the connection line between the first connection port and the second connection port, it is necessary to ensure that each pin of the power consumption device is connected to the connection line between the first connection port and the second connection port with the corresponding polarity.

[0048] Exemplarily, the first connection pin 1L of the first connection port is used to connect to the positive output pin of the power generating device, the second connection pin 1N of the first connection port is used to connect to the negative output pin of the power generating device, the third connection pin 2L of the second connection port is used to connect to the first live wire input pin of the AC power, the fourth connection pin 2N of the second connection port is used to connect to the first neutral wire input pin of the AC power, the fifth connection pin 3L of the third connection port is used to connect to the second live wire input pin of the electrical device, the sixth connection pin 3N of the third connection port is used to connect to the second neutral wire input pin of the electrical device, and the seventh connection pin E of the third connection port is used to connect to the ground wire input pin of the electrical device.

[0049] Therefore, the identification module in the inverter can connect to the auxiliary pins of each dual-contact relay to determine the voltage level of the auxiliary pins, thereby identifying whether the dual-contact relay is faulty and ensuring power safety. This allows for efficient and reliable relay detection without the need for additional voltage detection circuitry, significantly optimizing the detection process and hardware design space.

[0050] For example, the mains electricity in this application refers to the live wire and neutral wire in the power grid, the power generation equipment refers to the photovoltaic panel assembly, and the inverter is also used to convert the direct current generated by the photovoltaic panel assembly into alternating current and then transmit it to the electrical equipment and the mains electricity.

[0051] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0052] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0053] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. Industrial Applicability

[0054] The present application provides an inverter, which solves the technical problem in the prior art that relays on the neutral line and the ground line cannot detect faults, thereby achieving the technical effect of improving the safety of the inverter.

[0055] Furthermore, it can be understood that the inverter of the present application is reproducible and can be widely used in the field of inverter technology.

Claims

1. An inverter, characterized in that, The inverter is arranged on the power transmission line from the power generation device to the power consumption end, and the inverter includes a double-contact relay. Wherein, the double-contact relay includes: A main contact arranged on the power transmission line; An auxiliary contact linked with the main contact; An electromagnetic coil for generating a magnetic field when energized to drive the main contact to act, so as to change the on-off state of the power transmission line and link the auxiliary contact to act.

2. The inverter according to claim 1, characterized in that, The inverter further includes an identification module. Wherein, the identification module includes: A first pin connected to the auxiliary contact; A second pin connected to the electromagnetic coil for controlling the energization state of the electromagnetic coil; Wherein, the identification module is configured to determine whether the level signal of the auxiliary contact is correct according to the energization state of the electromagnetic coil, so as to perform fault detection on the double-contact relay.

3. The inverter according to claim 1, characterized in that, The power consumption end includes the commercial power and the electrical equipment. The power transmission line includes a first power transmission line and a second power transmission line. A preset connection point is arranged on the connection line between the output end of the power generation device and the input end of the commercial power. The first power transmission line refers to the power transmission line from the output end of the power generation device to the preset connection point, and the second power transmission line refers to the power transmission line from the preset connection point to the input end of the electrical equipment. The input end of the electrical equipment is used to connect to the preset connection point.

4. The inverter according to claim 3, characterized in that, The double-contact relay includes an inverter double-contact relay and / or a grid-connected double-contact relay. Wherein, the inverter double-contact relay is arranged on the first power transmission line, and the grid-connected double-contact relay is arranged on the second power transmission line, so as to control the power generation device to stop delivering power when the inverter double-contact relay is disconnected, and control the power generation device to only deliver power to the electrical equipment when only the grid-connected double-contact relay is disconnected.

5. The inverter according to claim 4, characterized in that, The preset connection point includes a first preset connection point and a second preset connection point. The first preset connection point is a point on the connection line between the positive output pin of the power generation device and the first live wire input pin of the commercial power, and the second preset connection point is a point on the connection line between the negative output pin of the power generation device and the first neutral wire input pin of the commercial power. The first power transmission line includes a first live wire power transmission line and a first neutral wire power transmission line. The First live wire power transmission line refers to the power transmission line from the positive output pin of the power generation device to the first preset connection point, and the first neutral wire power transmission line refers to the power transmission line from the negative output pin of the power generation device to the second preset connection point. The second power transmission line includes a second live wire power transmission line and a second neutral wire power transmission line. The second live wire power transmission line refers to the power transmission line from the first preset connection point to the first live wire input pin of the commercial power, and the second neutral wire power transmission line refers to the power transmission line from the second preset connection point to the first neutral wire input pin of the commercial power.

6. The inverter according to claim 5, wherein The inverse double-contact relay includes a first inverse double-contact relay and a second inverse double-contact relay. Among them, the first inverse double-contact relay is arranged on one of the first live wire power transmission line and the first neutral wire power transmission line, and the second inverse double-contact relay is arranged on the other of the first live wire power transmission line and the first neutral wire power transmission line.

7. The inverter according to claim 5, characterized in that, The grid-connected double-contact relay includes a first grid-connected double-contact relay and a second grid-connected double-contact relay. Among them, the first grid-connected double-contact relay is arranged on one of the second live wire power transmission line and the second neutral wire power transmission line, and the second grid-connected double-contact relay is arranged on the other of the second live wire power transmission line and the second neutral wire power transmission line.

8. The inverter according to claim 3, characterized in that, The power transmission line further includes a third power transmission line, and the third power transmission line is used to connect the ground wire to the ground wire input pin of the electrical equipment. The double-contact relay further includes a ground wire double-contact relay, and the ground wire double-contact relay is arranged on the third power transmission line.

9. The inverter according to claim 3, wherein The inverter further includes a first connection port, a second connection port and a third connection port arranged on the packaging shell of the inverter. Among them, the first connection port is used to connect the output end of the power generation equipment, the second connection port is used to connect the input end of the commercial power, and the preset connection point leads out the third connection port for connecting the input end of the electrical equipment.

10. The inverter according to claim 9, characterized in that, The first connection port includes a first connection pin and a second connection pin. The first connection pin is used to connect one of the positive output pin and the negative output pin of the power generation equipment, and the second connection pin is used to connect the other of the positive output pin and the negative output pin of the power generation equipment. The second connection port includes a third connection pin and a fourth connection pin. The third connection pin is used to connect one of the first live wire input pin and the first neutral wire input pin of the commercial power. The fourth connection pin is used to connect the other of the first live wire input pin and the first neutral wire input pin of the commercial power. The third connection port includes a fifth connection pin, a sixth connection pin and a seventh connection pin. The fifth connection pin is used to connect one of the second live wire input pin and the second neutral wire input pin of the electrical equipment. The sixth connection pin is used to connect the other of the second live wire input pin and the second neutral wire input pin of the electrical equipment. The seventh connection pin is used to connect the ground connection pin of the electrical equipment.

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