Identification circuit for an ac conversion device and ac conversion device

Abstract

The application relates to an identification circuit of an alternating current conversion device and the alternating current conversion device. The identification circuit comprises a first voltage division module, a second voltage division module and a detection control module; a first end of the first voltage division module is connected with a first live wire end, a second end of the first voltage division module is connected with a first end of the second voltage division module, the second end of the first voltage division module is also connected with a second live wire end or a second zero line end, and a second end of the second voltage division module is connected with a first zero line end; and the detection control module is used for identifying the access compliance conditions of the first access end and the second access end according to the voltage difference between the two ends of the first voltage division module and the voltage difference between the two ends of the second voltage division module. The identification circuit can identify the phenomenon that the two ends of the alternating current conversion device are connected on the electric energy interfaces of inverters or the electric energy interfaces of a power grid system, thereby being beneficial to prolonging the service life of the alternating current conversion device.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to an identification circuit for an AC conversion device and an AC conversion device. Background Technology

[0002] In fields such as distributed generation and new energy utilization, inverters, as key components for power conversion, can be connected to the power grid system to realize power transmission between the inverter and the power grid system.

[0003] In related technologies, the power interface of the inverter is connected to the power interface of the power grid system through an AC conversion device.

[0004] However, in related technologies, in order to facilitate plug-and-play operation of inverters, the power interface of inverters is usually designed to be the same as that of the power interface of the power grid system. This can easily lead to the phenomenon that both ends of the AC conversion equipment are connected to the power interface of the inverter or to the power interface of the power grid system, which can easily damage the AC conversion equipment. Summary of the Invention

[0005] Based on this, this application provides an identification circuit and an AC conversion device that can identify the phenomenon that both ends of the AC conversion device are connected to the power interface of the inverter or to the power interface of the power grid system, thereby helping to improve the lifespan of the AC conversion device.

[0006] In a first aspect, this application provides an identification circuit for an AC converter. The AC converter has a first access terminal and a second access terminal. The first access terminal includes a first live wire terminal and a first neutral wire terminal, and the second access terminal includes a second live wire terminal and a second neutral wire terminal. The identification circuit includes: a first voltage divider module, a second voltage divider module, and a detection and control module.

[0007] The first end of the first voltage divider module is connected to the first live wire end, the second end of the first voltage divider module is connected to the first end of the second voltage divider module, the second end of the first voltage divider module is also connected to the second live wire end or the second neutral wire end, and the second end of the second voltage divider module is connected to the first neutral wire end.

[0008] The detection control module is used to identify the access compliance status of the first access terminal and the second access terminal based on the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module.

[0009] In some embodiments, the detection control module is further configured to identify that the first access terminal and the second access terminal are connected to the same voltage source when the voltage difference across the first voltage divider module is less than the voltage threshold and the voltage difference across the second voltage divider module is greater than or equal to the voltage threshold, or when the voltage difference across the first voltage divider module is greater than or equal to the voltage threshold and the voltage difference across the second voltage divider module is less than the voltage threshold. Connecting to the same voltage source indicates non-compliant access.

[0010] The detection and control module is also used to identify different voltage sources connected to the first access terminal and the second access terminal when the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module are both greater than or equal to a voltage threshold. Connecting to different voltage sources indicates that the access is compliant.

[0011] In some embodiments, the detection control module is further configured to, when the second terminal of the first voltage divider module is connected to the second live wire terminal, identify that the first access terminal and the second access terminal are connected to a voltage source in phase if the voltage difference across the first voltage divider module is less than a voltage threshold and the voltage difference across the second voltage divider module is greater than or equal to a voltage threshold; and identify that the first access terminal and the second access terminal are connected to a voltage source out of phase if the voltage difference across the first voltage divider module is greater than or equal to a voltage threshold and the voltage difference across the second voltage divider module is less than a voltage threshold. Alternatively...

[0012] The detection and control module is also used to identify that the first access terminal and the second access terminal are connected to the voltage source out of phase when the second terminal of the first voltage divider module is connected to the second neutral terminal, if the voltage difference across the first voltage divider module is less than the voltage threshold and the voltage difference across the second voltage divider module is greater than or equal to the voltage threshold; if the voltage difference across the first voltage divider module is greater than or equal to the voltage threshold and the voltage difference across the second voltage divider module is less than the voltage threshold, then the first access terminal and the second access terminal are connected to the voltage source in phase.

[0013] In some embodiments, the detection control module is further configured to control the first live wire terminal to be connected to the second live wire terminal and the first neutral wire terminal to be connected to the second neutral wire terminal when the access of the first access terminal and the second access terminal is compliant.

[0014] The detection and control module is also used to maintain the disconnection between the first live wire terminal and the second live wire terminal and / or the disconnection between the first neutral wire terminal and the second neutral wire terminal in the event that the access of the first access terminal and the second access terminal is non-compliant.

[0015] In some embodiments, the identification circuit further includes a switching module; the input terminal of the switching module is connected to the second live wire terminal or the second neutral wire terminal, and the output terminal of the switching module is connected to the second terminal of the first voltage divider module.

[0016] The detection and control module is also used to control the switching module to turn on when a voltage source is connected to the first access terminal and the second access terminal; and to control the switching module to turn off when the first live wire terminal is connected to the second live wire terminal and the first neutral wire terminal is connected to the second neutral wire terminal.

[0017] In some embodiments, the switching module includes a relay and a switching unit; the first conducting terminal of the relay is connected to the second live wire terminal or the second neutral wire terminal, and the second conducting terminal of the relay is connected to the second terminal of the first voltage divider module.

[0018] The detection and control module is also used to output a first level signal when a voltage source is connected to the first access terminal and the second access terminal; the switching unit is used to drive the relay to conduct when the first level signal is received.

[0019] The detection and control module is also used to output a second level signal when the first live wire terminal is connected to the second live wire terminal and when the first neutral wire terminal is connected to the second neutral wire terminal; the switching unit is also used to drive the relay to disconnect when the second level signal is received.

[0020] In some embodiments, the detection control module includes a first arithmetic unit, a second arithmetic unit, and a control unit;

[0021] The first arithmetic unit is used to convert the voltage across the first voltage divider module into a voltage difference and output the voltage difference across the first voltage divider module; the second arithmetic unit is used to convert the voltage across the second voltage divider module into a voltage difference and output the voltage difference across the second voltage divider module.

[0022] The control unit is used to identify the access compliance status of the first access terminal and the second access terminal based on the voltage difference between the two ends of the first voltage divider module and the second voltage divider module.

[0023] In some embodiments, the first arithmetic unit includes a first voltage divider subunit, a second voltage divider subunit, and a first differential amplifier subunit;

[0024] The first end of the first voltage divider subunit is connected to the first end of the first voltage divider module, and the second end of the first voltage divider subunit is connected to the positive input end of the first differential amplifier subunit.

[0025] The first end of the second voltage divider subunit is connected to the second end of the first voltage divider module, and the second end of the second voltage divider subunit is connected to the inverting input of the first differential amplifier subunit.

[0026] The output of the first differential amplifier subunit is connected to the control unit.

[0027] In some embodiments, the second arithmetic unit includes a third voltage divider unit, a fourth voltage divider unit, and a second differential amplifier unit;

[0028] The first end of the third voltage divider subunit is connected to the first end of the second voltage divider module, and the second end of the third voltage divider subunit is connected to the positive input end of the second differential amplifier subunit.

[0029] The first end of the fourth voltage divider subunit is connected to the second end of the second voltage divider module, and the second end of the fourth voltage divider subunit is connected to the inverting input of the second differential amplifier subunit.

[0030] The output of the second differential amplifier subunit is connected to the control unit.

[0031] Secondly, this application provides an AC conversion device having a first access terminal and a second access terminal. The first access terminal includes a first live wire terminal and a first neutral wire terminal, and the second access terminal includes a second live wire terminal and a second neutral wire terminal. The second live wire terminal or the second neutral wire terminal is either the second live wire terminal or the second neutral wire terminal, and both the first live wire terminal and the first neutral wire terminal are connected to an identification circuit of the AC conversion device as described in the first aspect.

[0032] In the technical solution provided in this application embodiment, the first end of the first voltage divider module is connected to the first live wire end, the second end of the first voltage divider module is connected to the first end of the second voltage divider module, the second end of the first voltage divider module is also connected to the second live wire end or the second neutral wire end, and the second end of the second voltage divider module is connected to the first neutral wire end. In this way, the access status of the first access end and the second access end can be identified based on the voltage difference between the two ends of the first voltage divider module and the voltage difference between the two ends of the second voltage divider module. That is, it can identify the non-compliant access phenomenon where both ends of the AC conversion equipment are connected to the power interface of the inverter or both are connected to the power interface of the power grid system, thereby helping to improve the lifespan of the AC conversion equipment. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the identification circuit of the AC conversion device provided in the first embodiment;

[0035] Figure 2 A schematic diagram of the identification circuit of the AC conversion device provided in the second embodiment;

[0036] Figure 3 A schematic diagram of the identification circuit of the AC conversion device provided in the third embodiment;

[0037] Figure 4A schematic diagram of the identification circuit of the AC conversion device provided in the fourth embodiment;

[0038] Figure 5 A schematic diagram of the identification circuit of the AC conversion device provided in the fifth embodiment;

[0039] Figure 6 A schematic diagram of the identification circuit of the AC conversion device provided in the sixth embodiment;

[0040] Figure 7 A schematic diagram of the identification circuit of the AC conversion device provided in the seventh embodiment;

[0041] Figure 8 A schematic diagram of the structure of the AC conversion device provided in the first embodiment;

[0042] Figure 9 A schematic diagram of the structure of the AC conversion device provided in the second embodiment;

[0043] Figure 10 A schematic diagram of the AC conversion device provided in the third embodiment. Detailed Implementation

[0044] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0046] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined. In the description of the embodiments of this application, "each" means each of the multiple options, unless otherwise explicitly defined.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] AC conversion equipment is used to connect the inverter of the energy storage power supply to the power grid system to realize the energy conversion between the energy storage power supply and the power grid system. For example, electrical energy in the power grid system can be transmitted to the inverter through the AC conversion equipment, and electrical energy output by the inverter can be transmitted to the power grid system through the AC conversion equipment.

[0050] However, to facilitate plug-and-play operation of inverters, the power interface of inverters is usually designed to be the same as that of the power grid system. For example, both the power interface of the inverter and the power interface of the power grid system are sockets, and both input terminals of the AC conversion equipment are plugs.

[0051] When using AC converters, one terminal needs to be connected to the inverter's power interface, and the other terminal to the power grid's power interface. However, because the inverter's power interface and the power grid's power interface look similar, and user behavior is unpredictable, it's easy for both ends of the AC converter to be connected to either the inverter's power interface or both to the power grid's power interface, which can easily damage the AC converter.

[0052] Based on this, the present application provides an identification circuit for an AC conversion device, which can identify the phenomenon that both ends of the AC conversion device are connected to the power interface of the inverter or to the power interface of the power grid system, thereby helping to improve the lifespan of the AC conversion device.

[0053] Figure 1 This is a schematic diagram of the identification circuit of the AC conversion device provided in the first embodiment. Figure 2A schematic diagram of the identification circuit of the AC conversion device provided in the second embodiment is shown below. Figure 1 and Figure 2 As shown, the AC conversion device has a first access terminal and a second access terminal. The first access terminal includes a first live wire terminal and a first neutral wire terminal, and the second access terminal includes a second live wire terminal and a second neutral wire terminal. The identification circuit includes a first voltage divider module, a second voltage divider module, and a detection and control module.

[0054] The first end of the first voltage divider module is connected to the first live wire, the second end of the first voltage divider module is connected to the first end of the second voltage divider module, and the second end of the second voltage divider module is connected to the first neutral wire.

[0055] exist Figure 1 In the illustrated embodiment, the second end of the first voltage divider module is also connected to the second live wire end. Figure 2 In the embodiment shown, the second end of the first voltage divider module is also connected to the second neutral wire end.

[0056] The detection and control module is used to identify the access compliance status of the first access terminal and the second access terminal based on the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module. Both ends of the first voltage divider module and both ends of the second voltage divider module are connected to the detection and control module.

[0057] In the embodiments of this application, when the first access terminal is an input terminal, the second access terminal is an output terminal; or, when the first access terminal is an output terminal, the second access terminal is an input terminal.

[0058] In this embodiment, the voltage divider module includes resistors (the first voltage divider module includes resistor R1, and the second voltage divider module includes resistor R2). In other embodiments besides those in this application, the voltage divider module may include other devices, such as inductors or capacitors, or combinations of at least two of inductors, capacitors, and resistors.

[0059] In some embodiments, the resistance value of the first voltage divider module is the same as that of the second voltage divider module. In other embodiments, the resistance values ​​of the first voltage divider module and the second voltage divider module are different.

[0060] The detection and control module is also used to detect the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module.

[0061] For example, access compliance status includes access compliance and access non-compliance. Identifying the access compliance status of the first access terminal and the second access terminal may include: identifying access compliance of the first access terminal and the second access terminal, or identifying access non-compliance of the first access terminal and the second access terminal. For example, access compliance of the first access terminal and the second access terminal indicates that the first access terminal and the second access terminal are connected to different voltage sources. Access non-compliance of the first access terminal and the second access terminal indicates that the first access terminal and the second access terminal are connected to the same voltage source.

[0062] In some embodiments, the detection control module is further configured to output an alarm signal if it identifies that the access of the first access terminal and the second access terminal is non-compliant. For example, the alarm signal may indicate that the access of the first access terminal and the second access terminal is non-compliant, or it may indicate that the first access terminal and the second access terminal are connected to the same voltage source.

[0063] In some embodiments, the detection control module can be a module with data processing function. The detection control module can detect the voltage across the first voltage divider module and the voltage across the second voltage divider module, calculate the voltage difference between the first voltage divider module and the second voltage divider module, and identify the access compliance status of the first access terminal and the second access terminal based on the voltage difference between the first voltage divider module and the second voltage divider module.

[0064] The following is Figure 1 The working principle of the identification circuit of the AC conversion device in this application embodiment is illustrated by the following example:

[0065] If the first and second access terminals are connected to different voltage sources, the voltages of the first live wire, the first neutral wire, the second live wire, and the second neutral wire will all be different. Let the voltage of the first live wire be ACout_L, the voltage of the first neutral wire be ACout_N, the voltage of the second live wire be ACin_L, and the voltage of the second neutral wire be ACin_N. Since the second live wire cannot form a loop, the current output from the first live wire flows through resistors R1 and R2 to the first neutral wire. The current will not pass through the second live wire, so the voltage of the second live wire will not affect the current in resistors R1 and R2, and therefore will not affect the voltage across resistors R1 and R2. Therefore, the voltage across the first terminal of resistor R1 is ACout_L, and the voltage across the second terminal of resistor R1 is... The voltage across the first terminal of resistor R2 is The voltage across the second terminal of resistor R2 is ACout_N. Since both resistors R1 and R2 can divide the voltage normally, the voltage difference across resistor R1 and the voltage difference across resistor R2 are both greater than or equal to the voltage threshold. Alternatively, the absolute value of the difference between the voltage difference across resistor R1 and the voltage difference across resistor R2 is less than the voltage threshold.

[0066] If the first access terminal and the second access terminal are connected to the same voltage source, then the voltage of the first live wire terminal is the same as the voltage of the second live wire terminal, and the voltage of the first neutral wire terminal is the same as the voltage of the second neutral wire terminal. Taking the voltage of the first live wire terminal and the second live wire terminal as ACout_L, and the voltage of the first neutral wire terminal and the second neutral wire terminal as ACout_N as an example, the voltage across resistor R1 is ACout_L, resistor R1 is short-circuited, the voltage difference across resistor R1 is less than the voltage threshold, the voltage difference across resistor R2 is ACout_L-ACout_N, the voltage difference across resistor R2 is greater than or equal to the voltage threshold, or the absolute value of the difference between the voltage difference across resistor R1 and the voltage difference across resistor R2 is greater than or equal to the voltage threshold.

[0067] The following example uses a first voltage divider module including resistor R1 and a second voltage divider module including resistor R2. Figure 2 The working principle of the identification circuit of the AC conversion device in this application embodiment is illustrated by the following example:

[0068] If the first and second access terminals are connected to different voltage sources, the voltages of the first live wire, the first neutral wire, the second live wire, and the second neutral wire will all be different. Let the voltage of the first live wire be ACout_L, the voltage of the first neutral wire be ACout_N, the voltage of the second live wire be ACin_L, and the voltage of the second neutral wire be ACin_N. Since the second neutral wire cannot form a loop, the current output from the first live wire flows through resistors R1 and R2 to the first neutral wire. The current will not pass through the second neutral wire, so the voltage of the second neutral wire will not affect the current in resistors R1 and R2, and therefore will not affect the voltage across resistors R1 and R2. Therefore, the voltage at the first end of resistor R1 is ACout_L, and the voltage at the second end of resistor R1 is... The voltage across the first terminal of resistor R2 is The voltage across the second terminal of resistor R2 is ACout_N. Since both resistors R1 and R2 can divide the voltage normally, the voltage difference across resistor R1 and the voltage difference across resistor R2 are both greater than or equal to the voltage threshold. Alternatively, the absolute value of the difference between the voltage difference across resistor R1 and the voltage difference across resistor R2 is less than the voltage threshold.

[0069] If the first access terminal and the second access terminal are connected to the same voltage source, then the voltage of the first live wire terminal is the same as the voltage of the second live wire terminal, and the voltage of the first neutral wire terminal is the same as the voltage of the second neutral wire terminal. Taking the voltage of the first live wire terminal and the second live wire terminal as ACout_L, and the voltage of the first neutral wire terminal and the second neutral wire terminal as ACout_N as an example, the voltage across resistor R2 is ACout_N, resistor R2 is short-circuited, and the voltage difference across resistor R2 is less than the voltage threshold. Alternatively, the absolute value of the difference between the voltage difference across resistor R1 and the voltage difference across resistor R2 is greater than or equal to the voltage threshold.

[0070] In the technical solution provided in this application embodiment, the first end of the first voltage divider module is connected to the first live wire end, the second end of the first voltage divider module is connected to the first end of the second voltage divider module, the second end of the first voltage divider module is also connected to the second live wire end or the second neutral wire end, and the second end of the second voltage divider module is connected to the first neutral wire end. In this way, the access status of the first access end and the second access end can be identified based on the voltage difference between the two ends of the first voltage divider module and the voltage difference between the two ends of the second voltage divider module. That is, it can identify the non-compliant access phenomenon where both ends of the AC conversion equipment are connected to the power interface of the inverter or both are connected to the power interface of the power grid system, thereby helping to improve the lifespan of the AC conversion equipment.

[0071] In some embodiments, the detection control module is further configured to identify that the first access terminal and the second access terminal are connected to the same voltage source when the voltage difference across the first voltage divider module is less than a voltage threshold and the voltage difference across the second voltage divider module is greater than or equal to a voltage threshold, or when the voltage difference across the first voltage divider module is greater than or equal to a voltage threshold and the voltage difference across the second voltage divider module is less than a voltage threshold. Connecting to the same voltage source indicates non-compliant access.

[0072] In some embodiments, the detection control module is further configured to identify different voltage sources connected to the first access terminal and the second access terminal when the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module are both greater than or equal to a voltage threshold, and the connection to different voltage sources indicates that the connection is compliant.

[0073] For example, in addition to using voltage thresholds to identify the access compliance status of the first access terminal and the second access terminal, the absolute value of the difference between the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module can also be used to identify the access compliance status of the first access terminal and the second access terminal.

[0074] In some embodiments, the detection control module is further configured to identify that the first access terminal and the second access terminal are connected to the same voltage source when the absolute value of the difference between the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module is greater than or equal to a voltage threshold, and the connection to the same voltage source indicates that the connection is non-compliant.

[0075] In some embodiments, the detection control module is further configured to identify that the first access terminal and the second access terminal are connected to different voltage sources when the absolute value of the difference between the voltage difference across the first voltage divider module and the voltage difference across the second voltage divider module is less than a voltage threshold, and the connection to different voltage sources indicates that the connection is compliant.

[0076] For example, the voltage threshold can be a fixed value. For instance, the voltage threshold can be greater than 0V and less than or equal to 20V. For example, the voltage threshold can be 1V, 2V, 5V, 10V, or 20V, etc.

[0077] As another example, the voltage threshold can be determined based on the voltage difference between the voltage connected to the first live wire and the voltage connected to the first neutral wire. For example, if the voltage difference between the voltage connected to the first live wire and the voltage connected to the first neutral wire is 220V, the voltage threshold can be less than or equal to M×220V. M is between 0.01 and 0.2. For example, M is 0.01, 0.1, or 0.2.

[0078] In the technical solution provided in this application embodiment, the access of the first access terminal and the second access terminal is identified as compliant based on the relationship between the voltage difference across the first voltage divider module and the voltage threshold, and based on the relationship between the voltage difference across the second voltage divider module and the voltage threshold, thereby improving the accuracy of identifying whether the access of the first access terminal and the second access terminal is compliant.

[0079] The identification circuit in this embodiment can not only identify whether the first access terminal and the second access terminal are connected to the same voltage source, but also identify whether the first access terminal and the second access terminal are connected in reverse phase when connected to the same voltage source.

[0080] Specifically, when the first access terminal and the second access terminal are connected in phase (i.e., not out of phase), the first live wire terminal and the first neutral wire terminal are respectively connected to the live wire and the neutral wire of the voltage source, and the second live wire terminal and the second neutral wire terminal are respectively connected to the live wire and the neutral wire of the voltage source; or, the first live wire terminal and the first neutral wire terminal are respectively connected to the neutral wire and the live wire of the voltage source, and the second live wire terminal and the second neutral wire terminal are respectively connected to the neutral wire and the live wire of the voltage source. When the first access terminal and the second access terminal are connected in reverse, the first live wire terminal and the second live wire terminal are respectively connected to the neutral wire and the live wire of the voltage source, and the second live wire terminal and the second neutral wire terminal are respectively connected to the live wire and the neutral wire of the voltage source; or, the first live wire terminal and the first neutral wire terminal are respectively connected to the live wire and the neutral wire of the voltage source, and the second live wire terminal and the second neutral wire terminal are respectively connected to the neutral wire and the live wire of the voltage source.

[0081] Please continue reading. Figure 1 The detection and control module is also used to identify that the first access terminal and the second access terminal are connected in phase to the voltage source when the second terminal of the first voltage divider module is connected to the second live wire terminal. If the voltage difference between the two ends of the first voltage divider module is less than the voltage threshold and the voltage difference between the two ends of the second voltage divider module is greater than or equal to the voltage threshold, then the first access terminal and the second access terminal are connected in phase to the voltage source. If the voltage difference between the two ends of the first voltage divider module is greater than or equal to the voltage threshold and the voltage difference between the two ends of the second voltage divider module is less than the voltage threshold, then the first access terminal and the second access terminal are connected in phase to the voltage source.

[0082] The following is Figure 1 The working principle of the identification circuit of the AC conversion device in this application embodiment is illustrated by the following example:

[0083] If the voltage at the second live wire terminal is ACout_L, the voltage at the first live wire terminal is ACout_L, and the voltage at the first neutral wire terminal is ACout_N, then the voltage across R1 is less than the voltage threshold, and the voltage across R2 is greater than or equal to the voltage threshold. Therefore, based on the fact that the voltage across R1 is less than the voltage threshold and the voltage across R2 is greater than or equal to the voltage threshold, it can be identified that the first access terminal and the second access terminal are connected to the voltage source in positive phase.

[0084] If the voltage at the second live wire terminal is ACout_N, the voltage at the first live wire terminal is ACout_L, and the voltage at the first neutral wire terminal is ACout_N, then the voltage across R2 is less than the voltage threshold, and the voltage across R1 is greater than or equal to the voltage threshold. Therefore, based on the fact that the voltage across R2 is less than the voltage threshold and the voltage across R1 is greater than or equal to the voltage threshold, it can be identified that the first access terminal and the second access terminal are connected to the voltage source out of phase.

[0085] Please continue reading. Figure 2The detection and control module is also used to identify that the first access terminal and the second access terminal are connected to the voltage source out of phase when the second terminal of the first voltage divider module is connected to the second neutral terminal, if the voltage difference across the first voltage divider module is less than the voltage threshold and the voltage difference across the second voltage divider module is greater than or equal to the voltage threshold; if the voltage difference across the first voltage divider module is greater than or equal to the voltage threshold and the voltage difference across the second voltage divider module is less than the voltage threshold, then the first access terminal and the second access terminal are connected to the voltage source in phase.

[0086] The following is Figure 2 The working principle of the identification circuit of the AC conversion device in this application embodiment is illustrated by the following example:

[0087] If the voltage at the second neutral terminal is ACout_L, the voltage at the first live terminal is ACout_L, and the voltage at the first neutral terminal is ACout_N, then the voltage across R1 is less than the voltage threshold, and the voltage across R2 is greater than or equal to the voltage threshold. Therefore, based on the fact that the voltage across R1 is less than the voltage threshold and the voltage across R2 is greater than or equal to the voltage threshold, it can be identified that the first access terminal and the second access terminal are connected to the voltage source out of phase.

[0088] If the voltage at the second neutral terminal is ACout_N, the voltage at the first live terminal is ACout_L, and the voltage at the first neutral terminal is ACout_N, then the voltage across R2 is less than the voltage threshold, and the voltage across R1 is greater than or equal to the voltage threshold. Therefore, based on the fact that the voltage across R2 is less than the voltage threshold and the voltage across R1 is greater than or equal to the voltage threshold, it can be identified that the first access terminal and the second access terminal are connected to the voltage source in positive phase.

[0089] In some embodiments, the alarm signal output by the detection control module can also indicate that the first access terminal and the second access terminal are connected in a wrong phase.

[0090] In some embodiments, the detection and control module is further configured to control the first live wire terminal to be connected to the second live wire terminal and the first neutral wire terminal to be connected to the second neutral wire terminal, provided that the access of the first access terminal and the second access terminal is compliant. Thus, by connecting the first live wire terminal to the second live wire terminal and the first neutral wire terminal to the second neutral wire terminal, the AC conversion device can transmit electrical energy.

[0091] In some embodiments, the detection control module is further configured to maintain the disconnection between the first live wire and the second live wire and / or the first neutral wire and the second neutral wire in the event of non-compliant access at the first access terminal and the second access terminal. Thus, by disconnecting the first live wire and the second live wire and / or the first neutral wire and the second neutral wire, the AC converter can cut off the power transmission path, avoiding large circulating currents in the main circuit of the AC converter and improving the lifespan of the AC converter.

[0092] Figure 3 A schematic diagram of the identification circuit of the AC conversion device provided in the third embodiment is shown below. Figure 3 As shown, this identification circuit is compared to Figure 1 or Figure 2 The difference in this embodiment is that the identification circuit further includes a switching module; the input terminal of the switching module is connected to the second live wire terminal or the second neutral wire terminal, and the output terminal of the switching module is connected to the second terminal of the first voltage divider module. Exemplarily, the control terminal of the switching module is also connected to a detection control module.

[0093] In some embodiments, the detection control module is further configured to control the switching module to turn on when a voltage source is connected to the first access terminal and the second access terminal.

[0094] In some embodiments, the detection control module is further configured to control the switching module to disconnect when the first live wire terminal is connected to the second live wire terminal and the first neutral wire terminal is connected to the second neutral wire terminal.

[0095] In the technical solution provided in this application embodiment, when the first live wire terminal and the second live wire terminal are connected, and the first neutral wire terminal and the second neutral wire terminal are connected, the control switching module is disconnected, thereby avoiding the influence of the identification circuit of the AC conversion equipment on the power transmitted by the AC conversion equipment.

[0096] Figure 4 A schematic diagram of the identification circuit of the AC conversion device provided in the fourth embodiment is shown below. Figure 4 As shown, this identification circuit is compared to Figure 3 The difference in the embodiments is that: the switching module includes a relay RLY and a switching unit; the first conducting terminal of the relay RLY is connected to the second live wire terminal or the second neutral wire terminal, and the second conducting terminal of the relay RLY is connected to the second terminal of the first voltage divider module; for example, the first control terminal of the relay RLY is connected to the output terminal of the switching unit, the second control terminal of the relay RLY is connected to the voltage VCC, and the input terminal of the switching unit is connected to the detection and control module.

[0097] The detection and control module is also used to output a first level signal when a voltage source is connected to the first access terminal and the second access terminal; the switching unit is used to drive the relay RLY to turn on when the first level signal is received.

[0098] The detection and control module is also used to output a second level signal when the first live wire terminal is connected to the second live wire terminal and when the first neutral wire terminal is connected to the second neutral wire terminal; the switching unit is also used to drive the relay RLY to disconnect when the second level signal is received.

[0099] For example, the detection control module can output an AC_CK signal, which can be a first-level signal or a second-level signal.

[0100] For example, the first level signal can be a high level signal, and the second level signal can be a low level signal.

[0101] like Figure 4 As shown, the switching unit may include an NPN transistor Q1, resistors R3 and R4. The first end of resistor R3 is connected to the detection and control module, and the second end of resistor R3 is connected to the base of NPN transistor Q1. The first end of resistor R4 is connected to the base of NPN transistor Q1, and the second end of resistor R4 is grounded. The collector of NPN transistor Q1 is connected to the first control terminal of relay RLY, and the emitter of NPN transistor Q2 is grounded. When a high-level signal is received, the base of NPN transistor Q1 conducts, thereby driving relay RLY to conduct; when a low-level signal is received, it de-converts, thereby driving relay RLY to de-convert.

[0102] Figure 5 A schematic diagram of the identification circuit of the AC conversion device provided in the fifth embodiment is shown below. Figure 5 As shown, this identification circuit is compared to Figure 1 or Figure 2 The difference in the embodiments is that the detection control module includes a first arithmetic unit, a second arithmetic unit, and a control unit. For example, the first input terminal of the first arithmetic unit is connected to the first terminal of the first voltage divider module, the second terminal of the first arithmetic unit is connected to the second terminal of the first voltage divider module, the first input terminal of the second arithmetic unit is connected to the first terminal of the second voltage divider module, the second input terminal of the second arithmetic unit is connected to the second terminal of the second voltage divider module, and the output terminals of both the first and second arithmetic units are connected to the control unit.

[0103] The first arithmetic unit is used to convert the voltage across the first voltage divider module into a voltage difference and output the voltage difference across the first voltage divider module; the second arithmetic unit is used to convert the voltage across the second voltage divider module into a voltage difference and output the voltage difference across the second voltage divider module.

[0104] The control unit is used to identify the access compliance status of the first access terminal and the second access terminal based on the voltage difference between the two ends of the first voltage divider module and the second voltage divider module.

[0105] Figure 6 A schematic diagram of the identification circuit of the AC conversion device provided in the sixth embodiment is shown below. Figure 6 As shown, this identification circuit is compared to Figure 5 The difference in the embodiments is that the first arithmetic unit includes a first voltage divider unit, a second voltage divider unit, and a first differential amplifier unit.

[0106] The first end of the first voltage divider subunit is connected to the first end of the first voltage divider module, and the second end of the first voltage divider subunit is connected to the positive input of the first differential amplifier subunit; the first end of the second voltage divider subunit is connected to the second end of the first voltage divider module, and the second end of the second voltage divider subunit is connected to the inverting input of the first differential amplifier subunit; the output of the first differential amplifier subunit is connected to the control unit.

[0107] This identification circuit is compared to Figure 5 The difference in the embodiments is that the second arithmetic unit includes a third pressure divider unit, a fourth pressure divider unit, and a second differential amplifier unit.

[0108] The first end of the third voltage divider subunit is connected to the first end of the second voltage divider module, and the second end of the third voltage divider subunit is connected to the positive input of the second differential amplifier subunit; the first end of the fourth voltage divider subunit is connected to the second end of the second voltage divider module, and the second end of the fourth voltage divider subunit is connected to the inverting input of the second differential amplifier subunit; the output of the second differential amplifier subunit is connected to the control unit.

[0109] For example, the first voltage divider unit includes resistors R5 and R6, the second voltage divider unit includes resistors R7 and R8, the third voltage divider unit includes resistors R9 and R10, and the second voltage divider unit includes resistors R11 and R12.

[0110] The first terminal of resistor R5 is connected to the first terminal of the first voltage divider module. The second terminal of resistor R5 is connected to the first terminal of resistor R6. The second terminal of resistor R6 is connected to the positive input terminal of the first differential amplifier subunit. The first terminal of resistor R7 is connected to the second terminal of the first voltage divider module. The second terminal of resistor R7 is connected to the first terminal of resistor R8. The second terminal of resistor R8 is connected to the inverting input terminal of the first differential amplifier subunit. The first terminal of resistor R9 is connected to the first terminal of the second voltage divider module. The second terminal of resistor R9 is connected to the first terminal of resistor R10. The second terminal of resistor R10 is connected to the positive input terminal of the second differential amplifier subunit. The first terminal of resistor R11 is connected to the second terminal of the second voltage divider module. The second terminal of resistor R11 is connected to the first terminal of resistor R12. The second terminal of resistor R12 is connected to the inverting input terminal of the second differential amplifier subunit.

[0111] The first differential amplifier subunit includes a first differential amplifier U1, resistors R13 and R14, capacitors C1, C2, and C3. The non-inverting input of the first differential amplifier U1 is connected to the second terminal of resistor R6, and the first terminal of resistor R13 is connected to the first terminal of resistor R13, with the second terminal of R13 grounded. The non-inverting input of the first differential amplifier U1 is also connected to the first terminal of capacitor C1, with the second terminal of capacitor C1 grounded. The inverting input of the first differential amplifier U1 is connected to the second terminal of resistor R8, and the second terminal of resistor R14 is connected to the output terminal of the first differential amplifier U1. The inverting input of the first differential amplifier U1 is also connected to capacitor C2, with the second terminal of capacitor C2 connected to the output terminal of the first differential amplifier U1. The power supply terminal of the first differential amplifier U1 is connected to voltage VCC1 (VCC1 can be the same as or different from VCC), and the power supply terminal of the first differential amplifier U1 is also grounded through capacitor C3. The first differential amplifier U1 is also grounded.

[0112] The second operational unit includes a second differential amplifier U2, resistors R15 and R16, capacitors C4, C5, and C6. The non-inverting input of the second differential amplifier U2 is connected to the second terminal of resistor R10, and the first terminal of resistor R15 is also connected to it; the second terminal of resistor R15 is grounded. The non-inverting input of the second differential amplifier U2 is also connected to the first terminal of capacitor C4, and the second terminal of capacitor C4 is grounded. The inverting input of the second differential amplifier U2 is connected to the second terminal of resistor R12, and the second terminal of resistor R16 is connected to it; the second terminal of resistor R16 is connected to it; the inverting input of the second differential amplifier U2 is also connected to it, and the second terminal of capacitor C5 is connected to it. The power supply terminal of the second differential amplifier U2 is connected to voltage VCC1, and it is also grounded through capacitor C6. The second differential amplifier U2 is also grounded.

[0113] Figure 7 A schematic diagram of the identification circuit of the AC conversion device provided in the seventh embodiment is shown below. Figure 7 As shown, this identification circuit is for the above Figure 4 and Figure 6 The combination of. Figure 7 The descriptions of each component are as described in the above embodiments and will not be repeated here. Figure 7 In the illustrated embodiment, the control unit is connected to the input of the switching unit.

[0114] Figure 8 A schematic diagram of the AC conversion device provided in the first embodiment is shown below. Figure 8As shown, the AC conversion device has a first access terminal and a second access terminal. The first access terminal includes a first live wire terminal and a first neutral wire terminal, and the second access terminal includes a second live wire terminal and a second neutral wire terminal. The second live wire terminal, the first live wire terminal, and the first neutral wire terminal are all connected to the identification circuit of the AC conversion device as described in any of the above embodiments.

[0115] Figure 9 A schematic diagram of the AC conversion device provided in the second embodiment is shown below. Figure 8 As shown, the AC conversion device has a first access terminal and a second access terminal. The first access terminal includes a first live wire terminal and a first neutral wire terminal, and the second access terminal includes a second live wire terminal and a second neutral wire terminal. The second neutral wire terminal, the first live wire terminal, and the first neutral wire terminal are all connected to the identification circuit of the AC conversion device as described in any of the above embodiments.

[0116] In some embodiments, the first live wire terminal is also connected to the second live wire terminal, and the first neutral wire terminal is also connected to the second neutral wire terminal. The identification circuit of the AC converter is used to control the power transmission path between the first live wire terminal and the second live wire terminal, and the power transmission path between the first neutral wire terminal and the second neutral wire terminal. The identification circuit of the AC converter is also used to control the power transmission path between the first live wire terminal and the second live wire terminal to be disconnected and / or the power transmission path between the first neutral wire terminal and the second neutral wire terminal to be disconnected.

[0117] Figure 10 A schematic diagram of the AC conversion device provided in the third embodiment is shown below. Figure 10 As shown, the AC conversion device has a first access terminal and a second access terminal. The first access terminal includes a first live wire and a first neutral wire, and the second access terminal includes a second live wire and a second neutral wire. The second live wire and the second neutral wire of the second access terminal are respectively connected to the first live wire and the first neutral wire of the AC input socket. The second live wire and the second neutral wire of the AC input socket are respectively connected to the first live wire and the first neutral wire of a voltage converter (e.g., an AC-AC converter). The second live wire and the second neutral wire of the voltage converter are respectively connected to the first live wire and the first neutral wire of a grid-connected controller. The second live wire and the second neutral wire of the grid-connected controller are respectively connected to the first live wire and the first neutral wire of an AC output socket. The second live wire and the second neutral wire of the AC output socket are respectively connected to the first live wire and the first neutral wire of the first access terminal. Exemplarily, the grid-connected controller may include the identification circuit of the AC conversion device in any of the above embodiments. For example, in the grid-connected controller, the first live wire terminal and the second live wire terminal are connected through a relay, and the first neutral wire terminal and the second neutral wire terminal are connected through another relay. The identification circuit of the AC conversion equipment realizes the connection or disconnection of the first access terminal and the second access terminal by controlling the relay to turn on or off.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0119] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An identification circuit for an AC converter, the AC converter having a first access terminal and a second access terminal, the first access terminal including a first live wire terminal and a first neutral wire terminal, the second access terminal including a second live wire terminal and a second neutral wire terminal, characterized in that, The identification circuit comprises a first voltage division module, a second voltage division module and a detection control module. A first end of the first voltage division module is connected to the first live wire end, a second end of the first voltage division module is connected to a first end of the second voltage division module, and the second end of the first voltage division module is also connected to the second live wire end or the second zero line end, and a second end of the second voltage division module is connected to the first zero line end. The detection control module is configured to identify that the first access end and the second access end access the same voltage source in a case where a voltage difference between two ends of the first voltage division module is less than a voltage threshold value, and a voltage difference between two ends of the second voltage division module is greater than or equal to the voltage threshold value, or in a case where the voltage difference between two ends of the first voltage division module is greater than or equal to the voltage threshold value, and the voltage difference between two ends of the second voltage division module is less than the voltage threshold value, and the access to the same voltage source indicates an illegal access. The detection control module is further configured to identify that the first access end and the second access end access different voltage sources in a case where the voltage difference between two ends of the first voltage division module and the voltage difference between two ends of the second voltage division module are both greater than or equal to the voltage threshold value, and the access to the different voltage sources indicates a legal access.

2. The identification circuit according to claim 1, wherein The detection control module is further configured to identify that the first access end and the second access end access the same voltage source in a case where the voltage difference between two ends of the first voltage division module is less than a voltage threshold value, and a voltage difference between two ends of the second voltage division module is greater than or equal to the voltage threshold value, or in a case where the voltage difference between two ends of the first voltage division module is greater than or equal to the voltage threshold value, and the voltage difference between two ends of the second voltage division module is less than the voltage threshold value, and the access to the same voltage source indicates an illegal access. The detection control module is further configured to identify that the first access end and the second access end access the same voltage source in a case where the voltage difference between two ends of the first voltage division module is less than a voltage threshold value, and a voltage difference between two ends of the second voltage division module is greater than or equal to the voltage threshold value, or in a case where the voltage difference between two ends of the first voltage division module is greater than or equal to the voltage threshold value, and the voltage difference between two ends of the second voltage division module is less than the voltage threshold value, and the access to the same voltage source indicates an illegal access.

3. The identification circuit of claim 1, wherein, The first voltage division module comprises a first resistor, and the second voltage division module comprises a second resistor.

4. The identification circuit according to any one of claims 1-3, wherein The detection control module is further configured to control the first live wire end and the second live wire end to be conductive, and the first zero line end and the second zero line end to be conductive in a case where the first access end and the second access end access legal voltage sources. The detection control module is further configured to maintain the first live wire end and the second live wire end disconnected and / or the first neutral wire end and the second neutral wire end disconnected in the case that the first access end and the second access end do not access the power supply.

5. The identification circuit according to any one of claims 1 to 3, characterized in that The identification circuit further comprises a switching module, an input end of the switching module being connected to the second live wire end or the second neutral wire end, and an output end of the switching module being connected to a second end of the first voltage dividing module. The detection control module is further configured to control the switching module to be turned on in the case that the first access end and the second access end access the power supply, and to control the switching module to be turned off in the case that the first live wire end and the second live wire end are turned on and the first neutral wire end and the second neutral wire end are turned on.

6. The identification circuit of claim 5, wherein, The switching module comprises a relay and a switching unit, a first conducting end of the relay being connected to the second live wire end or the second neutral wire end, and a second conducting end of the relay being connected to the second end of the first voltage dividing module. The detection control module is further configured to output a first level signal in the case that the first access end and the second access end access the power supply, and the switching unit is configured to drive the relay to be turned on when the first level signal is received. The detection control module is further configured to output a second level signal in the case that the first live wire end and the second live wire end are turned on and the first neutral wire end and the second neutral wire end are turned on, and the switching unit is further configured to drive the relay to be turned off when the second level signal is received.

7. The identification circuit according to any one of claims 1 to 3, characterized in that The detection control module comprises a first operation unit, a second operation unit and a control unit. The first operation unit is configured to convert the voltage difference between the two ends of the first voltage dividing module into a voltage difference, and output the voltage difference between the two ends of the first voltage dividing module, and the second operation unit is configured to convert the voltage difference between the two ends of the second voltage dividing module into a voltage difference, and output the voltage difference between the two ends of the second voltage dividing module. The control unit is configured to identify the access compliance status of the first access end and the second access end according to the voltage difference between the two ends of the first voltage dividing module and the voltage difference between the two ends of the second voltage dividing module.

8. The identification circuit of claim 7, wherein, The first operation unit comprises a first voltage dividing subunit, a second voltage dividing subunit and a first differential amplification subunit. A first end of the first voltage dividing subunit is connected to a first end of the first voltage dividing module, and a second end of the first voltage dividing subunit is connected to a positive input end of the first differential amplification subunit. A first end of the second voltage dividing subunit is connected to a second end of the first voltage dividing module, and a second end of the second voltage dividing subunit is connected to a negative input end of the first differential amplification subunit. An output end of the first differential amplification subunit is connected to the control unit.

9. The identification circuit of claim 7, wherein, The second operation unit comprises a third voltage dividing subunit, a fourth voltage dividing subunit and a second differential amplification subunit. A first end of the third voltage dividing subunit is connected to a first end of the second voltage dividing module, and a second end of the third voltage dividing subunit is connected to a positive input end of the second differential amplification subunit. The first end of the fourth voltage dividing sub-unit is connected to the second end of the second voltage dividing module, and the second end of the fourth voltage dividing sub-unit is connected to the inverting input end of the second differential amplification sub-unit; The output end of the second differential amplification sub-unit is connected to the control unit.

10. An AC conversion device, characterized by The AC conversion device has a first access end and a second access end, the first access end includes a first live wire end and a first neutral wire end, the second access end includes a second live wire end and a second neutral wire end, the second live wire end or the second neutral wire end, and the first live wire end and the first neutral wire end are connected to the identification circuit of the AC conversion device as claimed in any one of claims 1 to 9.

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