Input terminal protection circuit, electric energy conversion equipment and electric energy conversion system

Abstract

The utility model discloses an input terminal protection circuit, an electric energy conversion device and an electric energy conversion system. The protection circuit comprises a clamping module and a control module. The input terminal board is provided with at least one input terminal and a conductive structure corresponding to the input terminal, and the conductive structure is arranged around the corresponding input terminal; the protection circuit further comprises temperature control switches corresponding to the input terminals, and the temperature control switches are sequentially connected between the first input end and the second input end of the control module in series. The temperature control switch is located within a preset distance of the conductive structure corresponding to the corresponding input terminal, and is configured to be switched off when the temperature of the corresponding conductive structure is greater than a temperature threshold value; and the clamping module is configured to clamp the potential of the second input end of the control module to a second potential when the at least one temperature control switch is switched off, so that the control module disconnects the connection between each input terminal and the power supply module, the over-temperature protection of the input terminals is realized, the control is simple, and the cost is relatively low.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially, and it is input terminal protection circuit and electric energy conversion equipment, electric energy conversion system. BACKGROUND

[0002] With the power of group string type photovoltaic inverter more and more big, power density also more and more high, corresponding power module short-circuit current also more and more big, then photovoltaic inverter's input terminal bears the current also more and more high, once the improper selection or contact is bad, it is easy to cause input terminal temperature to be too high, and even possible cause fire. Therefore, temperature monitoring and over-temperature protection for input terminal are particularly important. SUMMARY

[0003] The utility model provides a kind of input terminal protection circuit and electric energy conversion equipment, electric energy conversion system, to realize the temperature monitoring of input terminal, realize over-temperature protection, and control is simple, and cost is lower.

[0004] According to an aspect of the utility model, an input terminal protection circuit is provided, comprising: an embedding module and a control module;

[0005] At least one input terminal and a conductive structure corresponding to the input terminal are provided on the input terminal plate, and the conductive structure is provided around the corresponding input terminal;

[0006] The input terminal protection circuit further includes a temperature control switch corresponding to the input terminal, and each temperature control switch is connected in series between the first input and the second input of the control module; the first input of the control module is connected to a first potential;

[0007] The temperature control switch is located within a preset distance of the conductive structure corresponding to the corresponding input terminal, and is configured to be disconnected when the temperature of the corresponding conductive structure is greater than a temperature threshold;

[0008] The embedding module is connected to the second input of the control module, and is configured to embed the potential of the second input of the control module to a second potential when at least one temperature control switch is disconnected;

[0009] The control module is configured to disconnect the connection between each input terminal and a power module providing current to each input terminal in response to the second potential of the second input.

[0010] Optionally, the embedding module includes a current limiting unit and a storage unit.

[0011] The first end of the current-limiting unit is connected to the second potential, the second end of the current-limiting unit is connected to the first end of the storage unit, and the second end of the storage unit is connected to the first potential.

[0012] Optionally, the current-limiting unit comprises a resistor, and the storage unit comprises a capacitor.

[0013] The first end of the resistor is connected to the second potential, the second end of the resistor is connected to the first end of the capacitor, and the second end of the capacitor is connected to the first potential.

[0014] Optionally, the temperature control switch is attached to the corresponding conductive structure.

[0015] Optionally, the temperature control switch is attached to the corresponding conductive structure.

[0016] According to another aspect of the present application, an electric energy conversion device is provided, comprising: an electric energy conversion circuit, an input terminal plate, and an input terminal protection circuit according to the previous aspect.

[0017] The input terminal plate is provided with at least one input terminal and a conductive structure corresponding to the input terminal, and the conductive structure is arranged around the corresponding input terminal.

[0018] For any input terminal:

[0019] The input terminal and the switch module are connected in series between the power module and the input terminal of the electric energy conversion circuit.

[0020] The control module is connected to the switch module, and the control module is configured to control the switch module to be turned off when the potential of the second input terminal is the second potential.

[0021] Optionally, the power module comprises at least two series-connected power units, the switch module comprises a switch group corresponding to the power unit, the switch group comprises a first control switch and a second control switch, the input terminal plate is provided with an input terminal group corresponding to the switch group, and the input terminal group comprises two input terminals, namely a first input terminal and a second input terminal.

[0022] The first end of the first control switch is connected to the first power terminal of the corresponding power unit, the second end of the first control switch is connected to the first input terminal in the corresponding input terminal group, and the first input terminal is also connected to the first power terminal of the electric energy conversion circuit.

[0023] The first end of the second control switch is connected with the second power supply end of the corresponding power supply unit, the second end of the second control switch is connected with the second input terminal in the corresponding input terminal group, and the second input terminal is also connected with the second power supply end of the electric energy conversion circuit.

[0024] The control module is configured to control the first control switch and the second control switch in each switch group to be disconnected in response to the second potential of the second input terminal.

[0025] Optionally, the power supply module comprises at least two power supply units connected in series, the switch module comprises a switch group corresponding to the power supply unit, and the switch group comprises a first control switch and a second control switch; the input terminal plate is provided with an input terminal group corresponding to the switch group, and the input terminal group comprises two input terminals, namely a first input terminal and a second input terminal.

[0026] The first power supply end of the power supply unit is connected with the first input terminal in the corresponding input terminal group, the first input terminal is connected with the first end of the first control switch in the corresponding switch group, and the second end of the first control switch is connected with the first power supply end of the electric energy conversion circuit.

[0027] The second power supply end of the power supply unit is connected with the second input terminal in the corresponding input terminal group, the second input terminal is connected with the first end of the second control switch in the corresponding switch group, and the second end of the second control switch is connected with the second power supply end of the electric energy conversion circuit.

[0028] The control module is configured to control the first control switch and the second control switch in each switch group to be disconnected when the potential of the second input terminal is the second potential.

[0029] Optionally, the electric energy conversion circuit is a DC / AC conversion circuit, and the electric energy conversion circuit is configured to convert the direct current of the power supply module into alternating current and output when the potential of the second input terminal of the control module is the first potential.

[0030] According to another aspect of the utility model, an electric energy conversion system is provided, which comprises a power supply module, a switch module and the electric energy conversion device of the above aspect, and the power supply module is directly or through the switch module connected with at least two input terminals on the input terminal plate.

[0031] The technical scheme of the embodiment of the utility model discloses temperature control switch corresponding to input terminal is set, and each temperature control switch is connected in series between the first input terminal and the second input terminal of the control module in turn, when the temperature of any input terminal is greater than the temperature threshold value, the corresponding temperature switch is opened, then the embedding module embeds the potential of the second input terminal of the control module to the second potential, so that the control module controls the disconnection between the input terminal and the power module, and the input terminal is protected, and the circuit is simple and low in cost.

[0032] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0034] Figure 1 The structural schematic diagram of an input terminal protection circuit provided by the embodiment of the utility model is shown in the figure.

[0035] Figure 2 The structural schematic diagram of an input terminal plate provided by the embodiment of the utility model is shown in the figure.

[0036] Figure 3 The structural schematic diagram of a temperature control switch on the conductive structure provided by the embodiment of the utility model is shown in the figure.

[0037] Figure 4 The structural schematic diagram of an electric energy conversion device provided by the embodiment of the utility model is shown in the figure. DETAILED DESCRIPTION

[0038] In order to make the person in the art better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of the protection of the utility model.

[0039] It should be noted that the terms "first", "second", and the like in the description and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 A structure diagram of an input terminal protection circuit is provided for the embodiments of the utility model, the input terminal protection circuit comprises: an embedding module 10 and a control module 11;

[0041] At least one input terminal and a conductive structure corresponding to the input terminal are arranged on the input terminal plate, and the conductive structure is arranged around the corresponding input terminal;

[0042] The input terminal protection circuit further comprises a temperature control switch corresponding to the input terminal, and each temperature control switch is connected in series between the first input terminal I1 and the second input terminal I2 of the control module 11 in turn; The first input terminal I1 of the control module 11 is connected to the first potential;

[0043] The temperature control switch is located within a preset distance of the conductive structure corresponding to the corresponding input terminal 121, and is configured to be disconnected when the temperature of the corresponding conductive structure is greater than the temperature threshold;

[0044] The embedding module 10 is connected with the second input terminal I2 of the control module 11, and is configured to embed the potential of the second input terminal I2 of the control module 11 to the second potential U1 when at least one temperature control switch is disconnected;

[0045] The control module 11 is configured to disconnect the connection between each input terminal and the power module providing current to each input terminal in response to the second potential U1 of the second input terminal I2 of the control module 11.

[0046] The input terminal protection circuit can be applied to an electric energy conversion device to monitor the temperature of the input terminal on the input terminal plate in the electric energy conversion device and over-temperature protection. Wherein, the input terminal plate comprises a plurality of input terminals, and the plurality of input terminals are used to connect with the power module to transmit the electric energy provided by the power module to the electric energy conversion device for electric energy conversion.

[0047] The input terminal plate can be a PCB plate, the conductive structure can be copper foil, the conductive structure corresponds to the input terminal one by one, and the input terminal corresponds to the temperature control switch one by one, so the temperature control switch also corresponds to the conductive structure one by one. The shape of the conductive structure can be annular, arranged around the corresponding input terminal and can be in contact with the input terminal. The temperature control switch is located within a preset distance of the conductive structure corresponding to the corresponding input terminal 121, so that the ambient temperature where the temperature control switch is located is the temperature of the conductive structure, and the temperature of the conductive structure can be used to represent the temperature of the corresponding input terminal, so that the temperature control switch can be turned on or turned off in response to the temperature of the input terminal. The temperature control switch can adopt any one of the switches on the market that is turned on or turned off by temperature. When the temperature of the environment where the temperature control switch is located is less than or equal to the temperature threshold, the temperature control switch is closed. When the temperature of the environment where the temperature control switch is located is greater than the temperature threshold, the temperature control switch is turned off. The temperature threshold is the minimum temperature at which the temperature control switch is turned off. Optionally, the temperature control switch can be set to 95°C.

[0048] When the input terminal protection circuit includes only one temperature control switch, the temperature control switch is connected in series between the first input terminal I1 and the second input terminal I2 of the control module 11. When the input terminal protection circuit includes multiple temperature control switches, the multiple temperature control switches are connected in series between the first input terminal I1 and the second input terminal I2. In the present embodiment, m temperature control switches S1-Sm are exemplarily shown to over-temperature protect the temperature of m input terminals, and m is an integer greater than or equal to 2. The first potential is greater than the second potential U1, or the first potential is less than the second potential U1. In the present embodiment, the first potential is exemplarily shown to be less than the second potential U1. Optionally, the first potential can be a ground potential, i.e., the first input terminal I1 of the control module 11 is grounded GND, and the second potential U1 is 5V. When the temperatures of the m conductive structures corresponding to the m input terminals are all less than or equal to the temperature threshold, each temperature control switch is closed, and the potential of the second input terminal I2 of the control module 11 is equal to the first potential. If the input terminal is improperly selected or has poor contact, the input terminal will continuously heat up, the conductive structure corresponding to the input terminal will accumulate a large amount of heat, causing the temperature of the conductive structure to continuously rise. If the temperature of at least one of the m conductive structures corresponding to the m input terminals is greater than the temperature threshold, the corresponding temperature control switch is turned off, and the control module 11 embeds the potential of the second input terminal I2 to the second potential. When the potential of the second input terminal I2 is the second potential U1, the control module 11 cuts off the connection between the power supply module and each input terminal, so as to avoid the power supply module further inputting current to the input terminal and avoid high temperature damaging the input terminal and the electric energy conversion device.

[0049] The technical scheme of the embodiment of the utility model discloses a temperature control switch corresponding to each input terminal, and the temperature control switches are connected in series between the first input terminal and the second input terminal of the control module. When the temperature of any input terminal is greater than the temperature threshold, the corresponding temperature control switch is turned off, and then the embedding module embeds the potential of the second input terminal of the control module to the second potential, so that the control module controls the disconnection between the input terminal and the power module. When the temperature of any input terminal is too high, the temperature control switch is turned off, and the control module disconnects the input terminal and the power module, thereby protecting the input terminal, and the circuit is simple and low in cost.

[0050] Figure 2 A structural diagram of an input terminal plate is provided for the embodiment of the utility model, Figure 3 A structural diagram of a temperature control switch on a conductive structure is provided for the embodiment of the utility model, referring to Figure 1 、 Figure 2 and Figure 3 Optionally, the temperature control switch is attached to the corresponding conductive structure 121.

[0051] The input terminal plate 12 includes a plurality of input terminals, which are divided into two categories. One category is the first input terminal a1, and the other category is the second input terminal a0. The first input terminal a1 can be a male head, and the second input terminal a0 can be a female head. In this embodiment, only one first input terminal a1 on the input terminal plate 12 is exemplarily shown, the temperature control switch corresponding to the first input terminal a1 is the first temperature control switch S1, and the conductive structure 121 corresponding to the first input terminal a1 is also shown. The temperature control switch can be attached to the corresponding conductive structure 121 by adhesive, so that the temperature of the conductive structure 121 is better transmitted to the temperature control switch, and the temperature of the conductive structure sampled by the temperature control switch is more accurate. Further, the distance between the temperature control switch and the corresponding input terminal is less than a distance threshold. The distance threshold is the maximum distance value at which the temperature of the position of the temperature control switch can represent the temperature of the input terminal. The closer the position of the temperature control switch on the conductive structure 121 to the input terminal, the closer the temperature collected by the temperature control switch to the temperature of the input terminal, and the more accurate the control of the over-temperature protection.

[0052] Continuing to refer to Figure 1 Optionally, the embedding module 10 includes a current limiting unit 101 and a storage unit 102.

[0053] The first end of the current limiting unit 101 is connected to the second potential U1, the second end of the current limiting unit 101 is connected to the first end of the storage unit 102, and the second end of the storage unit 102 is connected to the first potential.

[0054] When all the temperature control switches are closed, the second input terminal I2 of the control module 11 is in communication with the first input terminal I1, and the potential of the second input terminal I2 is the second potential.Under the condition that at least one temperature control switch is opened, the connection between the second input terminal I2 and the first input terminal I1 is disconnected.Taking the example that the second potential U1 is greater than the first potential, the second potential charges the storage unit 102 through the current limiting unit 101 until the storage unit 102 is charged to the second potential U1, and the second potential U1 is input to the second input terminal I2.The control module 11 controls the connection between each input terminal and the power module to be disconnected in response to the second potential U1 input by the second input terminal I2, thereby protecting the input terminal and the power conversion device from damage.

[0055] Further, the current limiting unit 101 includes a resistor R1, and the storage unit 102 includes a capacitor C1.

[0056] The first end of the resistor R1 is connected to the second potential U1, the second end of the resistor R1 is connected to the first end of the capacitor C1, and the second end of the capacitor C2 is connected to the first potential.

[0057] In the embodiment, the embedding module only includes a resistor and a capacitor, and the structure is simple and easy to implement.Compared with the operational amplifier circuit, the over-temperature protection of the input terminal can be realized by the temperature control switch, the resistor and the capacitor in the embodiment, and the structure is simple and the cost is low.

[0058] Figure 4 A structural schematic diagram of a power conversion device is provided for the embodiment of the utility model, and the structural schematic diagram is shown in Figures 1-4 The power conversion device 1 includes a power conversion circuit 15, an input terminal plate 12 and the input terminal protection circuit in any of the above embodiments.

[0059] The input terminal plate 12 is provided with at least one input terminal and a conductive structure 121 corresponding to the input terminal, and the conductive structure 121 is arranged around the corresponding input terminal.

[0060] For any input terminal:

[0061] The input terminal is connected in series with the switch module 13 between the power module 14 and the input end of the power conversion circuit 15.

[0062] The control module 11 is connected with the switch module 13, and the control module 11 is configured to control the switch module 13 to be closed in response to the second potential U1 of the second input terminal I2.

[0063] The input terminal plate 12 and the switch module 13 can be connected in series between the input end of the power module 14 and the input end of the electric energy conversion circuit 15, or the switch module 13 and the input terminal plate can be connected in series between the power module 14 and the electric energy conversion circuit. In the photovoltaic power supply scene, the electric energy conversion device 1 in the embodiment can be a string inverter, and the electric energy conversion circuit can be a DC / AC conversion circuit, which is used to convert the direct current output by the power module 14 into alternating current and output. In an optional implementation, the electric energy conversion device is a box, the electric energy conversion circuit 15 and the control module 11 are arranged in the box, the input terminal plate 12 is arranged on one side of the box, and the input terminals are exposed to the outside of the box, so as to be connected with the power module 14 or connected with the power module 14 through the switch module 13.

[0064] The electric energy conversion circuit 15 is a DC / AC conversion circuit, and when the electric energy conversion device 1 is in normal operation, the electric energy conversion circuit 15 is configured to convert the direct current output by the power module 14 into alternating current and output when the potential of the second input end I2 of the control module 11 is the first potential. When the temperature of each input terminal is less than the temperature threshold, the temperature of the conductive structure is less than the temperature threshold, and each temperature control switch is closed, the potential of the second input end I2 of the control module 11 is the first potential. The electric energy output by the power module 14 is transmitted to the input end of the electric energy conversion circuit 15 through the switch module 13 and the input terminals on the input terminal plate 12, the electric energy conversion circuit 15 converts the input electric energy from direct current to alternating current and outputs three-phase alternating current into the power grid 16, realizing electric energy conversion. When the temperature of at least one input terminal is greater than the temperature threshold, the corresponding temperature control switch is opened, so that the potential of the second input end I2 of the control module 11 is the second potential U1, and the control module 11 controls the switch module 13 to be opened in response to the second potential U1 of the second input end I2, cutting off the connection between the power module 14 and the input terminal, to avoid damage to the input terminal and the electric energy conversion device due to continuous temperature rise. The electric energy conversion device in the embodiment is not limited to single-phase inverters, three-phase inverters, PCSs and all devices requiring plate-mounted direct current input terminals.

[0065] With reference to the foregoing Figures 1-4 Optionally, the power module 14 includes at least two power units 141 connected in series, the switch module 13 includes a switch group 131 corresponding to the power units 141, the switch group 131 includes a first control switch k1 and a second control switch k2, the input terminal plate 12 is provided with an input terminal group corresponding to the switch group 131, the input terminal group includes two input terminals, which are a first input terminal a1 and a second input terminal a0.

[0066] The first end of the first control switch k1 is connected with the first power end of the corresponding power supply unit 141, the second end of the first control switch k1 is connected with the first input terminal a1 in the corresponding input terminal group, and the first input terminal a1 is also connected with the first power end of the electric energy conversion circuit 15.

[0067] The first end of the second control switch k2 is connected with the second power end of the corresponding power supply unit 141, the second end of the second control switch k2 is connected with the second input terminal a0 in the corresponding input terminal group, and the second input terminal a0 is also connected with the second power end of the electric energy conversion circuit 15.

[0068] The control module 11 is configured to control the first control switch k1 and the second control switch k2 in each switch group 131 to be both turned off when the potential of the second input terminal I2 is the second potential U2.

[0069] The power supply unit 141 can be a direct current power supply or a battery panel, and in the embodiment, n power supply units 141 are exemplarily shown, that is, power supply unit 1 to power supply unit n. One power supply unit 141 corresponds to two control switches, that is, one first control switch k1 and one second control switch k2, the first power end of the power supply unit 141 is connected with the first power end of the electric energy conversion circuit 15 through the first control switch k1, and the second power end of the power supply unit 141 is connected with the second power end of the electric energy conversion circuit 15 through the second control switch k2. Wherein, the first power end is a positive end, and the second power end is a negative end, or the first power end is a negative end, and the second power end is a positive end.

[0070] In another alternative embodiment, the switch module is connected between the input terminal plate and the electric energy conversion circuit, that is, the switch module is arranged inside the electric energy conversion device. Specifically, the first power end of the power supply unit is connected with the first input terminal in the corresponding input terminal group, the first input terminal is connected with the first end of the first control switch in the corresponding switch group, and the second end of the first control switch is connected with the first power end of the electric energy conversion circuit; the second power end of the power supply unit is connected with the second input terminal in the corresponding input terminal group, the second input terminal is connected with the first end of the second control switch in the corresponding switch group, and the second end of the second control switch is connected with the second power end of the electric energy conversion circuit. The working process is the same, and details are not repeated here. Figure 4

[0071] The utility model embodiment further provides an electric energy conversion system, including power module, switch module and the electric energy conversion device in any one embodiment above, power module is connected with at least two input terminals on input terminal plate directly or through switch module.

[0072] ​The switch module and the input terminal plate are connected in series between the power module and the electric energy conversion circuit, and the power module is connected with the electric energy conversion circuit 15 through the switch module and the input terminal. The electric energy conversion system has the same beneficial effects as the electric energy conversion device, which will not be repeated here.

[0073] It should be understood that the steps can be reordered, added, or deleted using the various forms of flow shown above. For example, the steps described in the present application can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0074] The above specific embodiments do not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An input terminal protection circuit characterized by comprising: The input terminal protection circuit comprises: a control module and an embedding module; an input terminal plate, at least one input terminal and a conductive structure corresponding to the input terminal are arranged on the input terminal plate, and the conductive structure is arranged around the corresponding input terminal; the input terminal protection circuit further comprises a temperature control switch corresponding to the input terminal, and each temperature control switch is connected in series between a first input terminal and a second input terminal of the control module; the first input terminal of the control module is connected to a first potential; the temperature control switch is located within a preset distance of the conductive structure corresponding to the corresponding input terminal, and is configured to be disconnected when the temperature of the corresponding conductive structure is greater than a temperature threshold; the embedding module is connected to the second input terminal of the control module, and is configured to embed the potential of the second input terminal of the control module to a second potential when at least one temperature control switch is disconnected; the control module is configured to disconnect the connection between each input terminal and a power module providing current to each input terminal in response to the second potential of the second input terminal.

2. The input terminal protection circuit according to claim 1, characterized in that, The embedding module comprises a current limiting unit and a storage unit; the first end of the current limiting unit is connected to the second potential, the second end of the current limiting unit is connected to the first end of the storage unit, and the second end of the storage unit is connected to the first potential.

3. The input terminal protection circuit according to claim 2, characterized in that, The current limiting unit comprises a resistor, and the storage unit comprises a capacitor; the first end of the resistor is connected to the second potential, the second end of the resistor is connected to the first end of the capacitor, and the second end of the capacitor is connected to the first potential.

4. The input terminal protection circuit of claim 1, wherein The temperature control switch is attached to the corresponding conductive structure.

5. The input terminal protection circuit of claim 4, wherein The distance between the temperature control switch and the corresponding input terminal is less than a distance threshold.

6. An electric energy conversion device, characterized by The input terminal protection circuit comprises: an electric energy conversion circuit, an input terminal plate and the input terminal protection circuit of any one of claims 1-5; at least one input terminal and a conductive structure corresponding to the input terminal are arranged on the input terminal plate, and the conductive structure is arranged around the corresponding input terminal; for any input terminal: the input terminal and a switch module are connected in series between a power module and an input terminal of the electric energy conversion circuit; the control module is connected to the switch module, and the control module is configured to control the switch module to be turned off in response to the second potential of the second input terminal.

7. The electrical energy transformation device of claim 6, wherein, The power module comprises at least two series-connected power units, the switch module comprises a switch group corresponding to the power unit, the switch group comprises a first control switch and a second control switch; the input terminal plate is provided with an input terminal group corresponding to the switch group, and the input terminal group comprises two input terminals, namely a first input terminal and a second terminal; the first end of the first control switch is connected to the first power terminal of the corresponding power unit, the second end of the first control switch is connected to the first input terminal in the corresponding input terminal group, and the first input terminal is also connected to the first power terminal of the electric energy conversion circuit; The first end of the second control switch is connected with the second power supply end of the corresponding power supply unit, the second end of the second control switch is connected with the second input terminal in the corresponding input terminal group, and the second input terminal is also connected with the second power supply end of the electric energy conversion circuit; The control module is configured to control the first control switch and the second control switch in each switch group to be both turned off when the potential of the second input terminal is the second potential.

8. The electrical energy transformation device of claim 6, wherein, The power supply module includes at least two power supply units connected in series, the switch module includes a switch group corresponding to the power supply unit, the switch group includes a first control switch and a second control switch, and the input terminal plate is provided with an input terminal group corresponding to the switch group. The first power supply end of the power supply unit is connected with the first input terminal in the corresponding input terminal group, the first input terminal is connected with the first end of the first control switch in the corresponding switch group, and the second end of the first control switch is connected with the first power supply end of the electric energy conversion circuit. The second power supply end of the power supply unit is connected with the second input terminal in the corresponding input terminal group, the second input terminal is connected with the first end of the second control switch in the corresponding switch group, and the second end of the second control switch is connected with the second power supply end of the electric energy conversion circuit. The control module is configured to control the first control switch and the second control switch in each switch group to be both turned off when the potential of the second input terminal is the second potential.

9. The electrical energy transformation device of claim 6, wherein, The electric energy conversion circuit is a DC / AC conversion circuit, and the electric energy conversion circuit is configured to convert the direct current of the power supply module into alternating current and output when the potential of the second input terminal of the control module is the first potential.

10. An electric energy conversion system, characterized by The electric energy conversion device includes a power supply module, a switch module and the electric energy conversion device according to any one of claims 6-9, and the power supply module is directly or through the switch module connected with at least two input terminals on the input terminal plate.

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