Control protection circuit of inverter and inverter system

Abstract

The utility model relates to a control protection circuit of an inverter and an inverter system. The control protection circuit comprises a power supply management module which is connected with the inverter and is used for providing a DC voltage signal for the inverter so as to control the operation and stop of the inverter; the signal acquisition control module is connected with the inverter and is used for acquiring operating parameters of the inverter, judging that the inverter is in an abnormal working state when the operating parameters meet preset conditions and generating an abnormal state signal; and the self-locking module is respectively connected with the signal acquisition control module and the power supply management module and is used for generating a first control signal according to the abnormal state signal, and the first control signal is used for controlling the power supply management module to generate a direct current voltage signal for controlling the inverter to stop. And the influence of the abnormal state on the inverter is reduced, so that the inverter is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic power, in particular to a control protection circuit and an inverter system of an inverter. Background Art

[0002] During the grid-connected operation of the inverter, due to the influence of the external environment, different abnormal situations may occur. If not handled in time, the inverter will be damaged. How to protect the inverter when abnormal situations occur has become an urgent problem to be solved. Utility Model Content

[0003] Based on this, it is necessary to provide an inverter control protection circuit and an inverter system that can detect abnormal conditions of the inverter and protect the inverter.

[0004] A control protection circuit for an inverter, comprising:

[0005] A power management module, connected to the inverter, for providing a DC voltage signal to the inverter to control the operation and stop of the inverter;

[0006] A signal acquisition control module, connected to the inverter, for acquiring operating parameters of the inverter, and determining that the inverter is in an abnormal working state when the operating parameters meet preset conditions, and generating an abnormal state signal;

[0007] The self-locking module is connected to the signal acquisition control module and the power management module respectively, and is used to generate a first control signal according to the abnormal state signal, and the first control signal is used to control the power management module to generate a DC voltage signal for controlling the inverter to stop.

[0008] In one of the embodiments, the operating parameters include at least one of output voltage, output current and operating temperature, and the signal acquisition control module determines that the inverter is in an abnormal operating state when any of the operating parameters meets a preset condition.

[0009] In one embodiment, the signal acquisition control module includes:

[0010] A collection submodule, the input end of which is connected to the inverter and is used to collect the operating parameters;

[0011] The operation submodule is connected to the output end of the acquisition submodule, and is used to determine that the inverter is in an abnormal working state and generate an abnormal state signal when the operating parameter meets the preset condition.

[0012] In one embodiment, the operating parameters include output voltage, output current and operating temperature, and the acquisition submodule includes:

[0013] A voltage collection unit, wherein an input end of the voltage collection unit is connected to the inverter and is used to collect an output voltage of the inverter when the inverter is running;

[0014] A current collection unit, wherein an input end of the current collection unit is connected to the inverter and is used to collect an output current of the inverter when the inverter is running;

[0015] A temperature acquisition unit, wherein an input end of the temperature acquisition unit is connected to the inverter and is used to acquire the operating temperature of the inverter when the inverter is running;

[0016] The operation submodule is further used to determine that the inverter is in an abnormal voltage state and generate the abnormal state signal when the output voltage meets the preset voltage condition; it is also used to determine that the inverter is in an abnormal current state and generate the abnormal state signal when the output current meets the preset current condition; it is also used to determine that the inverter is in an abnormal temperature state and generate the abnormal state signal when the operating temperature meets the preset temperature condition;

[0017] Among them, the output end of the voltage acquisition unit, the output end of the current acquisition unit and the output end of the temperature acquisition unit are the output ends of the acquisition submodule.

[0018] In one of the embodiments, the operation submodule is further used to determine that the inverter is in an overvoltage state when the output voltage is greater than a first voltage threshold and is maintained for a first preset time period, and to determine that the inverter is in an undervoltage state when the output voltage is less than a second voltage threshold and is maintained for a second preset time period; the operation submodule is further used to determine that the inverter is in an overcurrent state when the output current is greater than a current threshold and is maintained for a third preset time period; the operation submodule is further used to determine that the inverter is in an overtemperature state when the operating temperature is greater than a temperature threshold and is maintained for a fourth preset time period.

[0019] In one embodiment, the self-locking module comprises:

[0020] A power supply submodule, one end of which is connected to the signal acquisition control module, and the other end of which is connected to the power supply end of the power management module, and is used to generate a power supply signal according to the abnormal state signal;

[0021] A setting submodule, one end of which is connected to the signal acquisition control module and the other end of which is connected to the feedback end of the power management module, and is used to generate a setting signal according to the abnormal state signal;

[0022] The first control signal includes the power supply signal and the set signal, both of which have level states opposite to those of the abnormal state signal.

[0023] In one embodiment, the power supply submodule includes a voltage divider resistor R1, a voltage divider resistor R2, a voltage divider resistor R3, a filter capacitor C1, a filter capacitor C2, a switch tube Q1 and a switch tube Q2;

[0024] Among them, one end of the voltage-dividing resistor R1 is connected to the power supply end of the power management circuit, and the other end of the voltage-dividing resistor R1 is connected to one end of the voltage-dividing resistor R2 and the input end of the switch tube Q1; the other end of the voltage-dividing resistor R2 is connected to the control end of the switch tube Q1, the input end of the switch tube Q2, and the signal acquisition control circuit; one end of the voltage-dividing resistor R3 is connected to the output end of the switch tube Q1 and the control end of the switch tube Q2; the other end of the voltage-dividing resistor R3 and the output end of the switch tube Q2 are connected to the high-voltage equivalent grounding end; the filter capacitor C1 is connected in parallel to both ends of the voltage-dividing resistor R2; the filter capacitor C2 is connected in parallel to both ends of the voltage-dividing resistor R3.

[0025] In one embodiment, the setting submodule includes:

[0026] A diode D1, wherein the anode of the diode D1 is connected to the feedback end of the power management module, and the cathode of the diode D1 is connected to the signal acquisition control module.

[0027] In one embodiment, the control protection circuit further includes:

[0028] A filtering module, wherein the input end of the filtering module is connected to the output end of the signal acquisition control module, and the output end of the filtering module is connected to the input end of the self-locking module, and is used to obtain a filtered signal after filtering the abnormal state signal.

[0029] In one embodiment, the filtering module includes a filtering resistor R6 and a filtering capacitor C3, one end of the filtering resistor R6 is connected to one end of the filtering capacitor C3, and together serve as the input end of the filtering module, the other end of the filtering resistor R6 is the output end of the filtering module, and the other end of the filtering capacitor C3 is connected to the low-voltage equivalent grounding end.

[0030] In one embodiment, the control protection circuit further includes:

[0031] A signal transmission module, wherein the input end of the signal transmission module is connected to the output end of the filtering module, and the output end of the signal transmission module is connected to the self-locking module, and is used to transmit the filtered signal to the self-locking module.

[0032] In one embodiment, the signal transmission module includes a light emitting device and a photosensitive device, and the control protection circuit further includes:

[0033] A switch module, wherein an input end of the switch module is connected to an output end of the filter module, and an output end of the switch module is connected to the light emitting device, and is used to control the turning on and off of the light emitting device according to the filter signal;

[0034] Wherein, the photosensitive device is connected to the self-locking module.

[0035] In one embodiment, the light emitting device includes a light emitting diode, the photosensitive device includes a phototransistor, and the switch module includes a voltage divider resistor R4, a voltage divider resistor R5, a switch tube Q3, a bias resistor R7 and a filter capacitor C4;

[0036] Among them, one end of the voltage-dividing resistor R4 is connected to the power supply, and the other end of the voltage-dividing resistor R4 is connected to the positive electrode of the light-emitting diode and one end of the voltage-dividing resistor R5; the other end of the voltage-dividing resistor R5 is connected to the negative electrode of the light-emitting diode and the input end of the switch tube Q3; the control end of the switch tube Q3 is connected to one end of the bias resistor R7 and one end of the filter capacitor C4, and together serve as the input end of the switch module; the output end of the switch tube Q3, the other end of the bias resistor R7, and the other end of the filter capacitor C4 are connected to the low-voltage equivalent grounding end.

[0037] In one embodiment, the control protection circuit further includes:

[0038] A status display module is connected to the signal acquisition control module and is used to acquire and display the abnormal working state of the inverter according to the abnormal state signal.

[0039] In the control and protection circuit of the above-mentioned inverter, the signal acquisition control module acquires the operating parameters of the inverter and generates an abnormal state signal when the operating parameters meet the preset conditions. The self-locking module generates a first control signal according to the received abnormal state signal to control the power management module to generate a DC voltage signal for controlling the inverter to stop, thereby realizing the detection of the abnormal state of the inverter, and when the inverter has an abnormal condition, the inverter is controlled to stop running, reducing the impact of the abnormal state on the inverter, thereby protecting the inverter.

[0040] An inverter system, comprising:

[0041] Inverter;

[0042] A control protection circuit for an inverter as described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 is a structural block diagram of a control protection circuit of an inverter in one embodiment;

[0045] Figure 2 is a structural block diagram of a control protection circuit of an inverter in another embodiment;

[0046] Figure 3 A structural block diagram of a control protection circuit of an inverter in yet another embodiment;

[0047] Figure 4 A partial circuit diagram of a control protection circuit of an inverter in one embodiment;

[0048] Figure 5 FIG. 4 is a circuit diagram of an inverter in an embodiment.

[0049] Description of reference numerals:

[0050] 100, power management module; 200, inverter; 202, photovoltaic panel; 204, energy storage battery; 206, first EMI filter; 208, second EMI filter; 210, boost circuit; 212, boost-buck circuit; 214, power inverter circuit; 216, three-level drive circuit; 300, signal acquisition control module; 302, acquisition submodule; 3002, voltage acquisition unit; 3004, current acquisition unit; 3006, temperature acquisition unit; 304, operation submodule; 400, self-locking module; 402, power supply submodule; 404, setting submodule; 500, status display module; 600, filtering module; 700, signal transmission module; 800, switch module; 900, feedback loop. DETAILED DESCRIPTION

[0051] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0054] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, sub-modules, units, etc. have electrical signals or data transmission between each other.

[0055] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0056] Figure 1 FIG. 1 is a structural block diagram of a control protection circuit of an inverter in an embodiment. Figure 1 As shown, in this embodiment, a control protection circuit of an inverter is provided, which is used to protect the inverter 200. The control protection circuit includes: a power management module 100, a signal acquisition control module 300 and a self-locking module 400; the power management module 100 is connected to the inverter 200, and is used to provide a DC voltage signal to the inverter 200 to control the operation and stop of the inverter 200; the signal acquisition control module 300 is connected to the inverter 200, and is used to collect the operating parameters of the inverter 200. When the operating parameters meet the preset conditions, it is determined that the inverter 200 is in an abnormal working state and generates an abnormal state signal; the self-locking module 400 is respectively connected to the signal acquisition control module 300 and the power management module 100, and is used to generate a first control signal according to the abnormal state signal, and the first control signal is used to control the power management module 100 to generate a DC voltage signal for controlling the inverter 200 to stop.

[0057] Specifically, the inverter 200 has two states: running and stopping. When the inverter 200 is running, it provides electric energy to the load, such as providing AC power (mains power) or DC power; the operating parameters are the parameters when the inverter is running, and the preset conditions are the range or conditions of the operating parameters when the inverter is in an abnormal working state; the DC voltage signal received during the operation of the inverter 200 controls the operation of the inverter 200. The power management module 100 is responsible for the management and control of the auxiliary power supply of the inverter. The entire inverter is composed of various functional sub-modules, such as DC / DC circuit, AC / DC circuit, MCU control circuit, communication circuit, operational amplifier circuit, drive circuit, etc., and these circuits need to be powered by the auxiliary power circuit.

[0058] In the control and protection circuit of the above-mentioned inverter 200, the signal acquisition control module 300 acquires the operating parameters of the inverter 200, and generates an abnormal state signal when the operating parameters meet the preset conditions. The self-locking module 400 generates a first control signal according to the received abnormal state signal to control the power management module 100 to generate a DC voltage signal for controlling the inverter 200 to stop, thereby realizing the detection of the abnormal state of the inverter 200, and when an abnormal condition occurs in the inverter 200, the inverter 200 is controlled to stop running, reducing the impact of the abnormal state on the inverter 200, thereby protecting the inverter 200.

[0059] In one embodiment, the operating parameters include at least one of the output voltage, output current and operating temperature during the operation of the inverter 200, and the signal acquisition control module 300 determines that the inverter 200 is in an abnormal working state when any of the operating parameters meets the preset conditions. In practical applications, the type and selection position of the operating parameters can be set as needed (the speed or size of the change of the operating parameters with different abnormalities). Exemplarily, the signal acquisition control module 300 collects any one, any two or three operating parameters of the output voltage, output current and operating temperature. As long as there are operating parameters that meet the preset conditions, it is determined that the inverter 200 is in an abnormal working state, and then the inverter 200 is controlled to stop, reducing the operating time of the inverter 200 in the abnormal working state, so as to achieve the purpose of protecting the inverter 200. When the inverter 200 is in different abnormal working states, there are certain differences in the impact on different operating parameters and the speed of the impact. By setting the type and quantity of the operating parameters, it is possible to quickly detect that the inverter 200 is in an abnormal working state, and then control the inverter 200 to stop.

[0060] Figure 2 FIG. 1 is a structural block diagram of a control protection circuit of an inverter in another embodiment. Figure 2As shown, in one embodiment, the signal acquisition control module 300 includes: an acquisition submodule 302 and an operation submodule 304; the input end of the acquisition submodule 302 is connected to the inverter 200 for acquiring the operating parameters; the operation submodule 304 is connected to the output end of the acquisition submodule 304, and is used to determine that the inverter 200 is in an abnormal working state when the operating parameters meet the preset conditions, and generate an abnormal state signal, and the output end of the operation submodule 304 is connected to the self-locking module 400, and is used to send the abnormal state signal to the self-locking module 400. The acquisition of operating parameters is realized by the acquisition submodule 302, and the operating parameters are processed by the operation submodule 304. When the inverter 200 is in an abnormal working state, an abnormal state signal is generated and sent. Exemplarily, the cloud submodule 304 includes but is not limited to a comparator, a memory, a calculator, a single-chip microcomputer, and other modules or submodules that have digital operations and generate functions to represent the operation results.

[0061] Continue to refer Figure 2In one embodiment, the operating parameters include output voltage, output current and operating temperature, and the acquisition submodule 302 includes: a voltage acquisition unit 3002, a current acquisition unit 3004 and a temperature acquisition unit 3006; the input end of the voltage acquisition unit 3002 is connected to the inverter 200, and is used to collect the output voltage of the inverter 200 when the inverter 200 is running; the input end of the current acquisition unit 3002 is connected to the inverter 200, and is used to collect the output current of the inverter 200 when the inverter 200 is running; the temperature acquisition unit 3006 is connected to the input end of the current acquisition unit 3004 and is used to collect the output current of the inverter 200 when the inverter 200 is running; The input end of the collection unit 3006 is connected to the inverter 200, and is used to collect the operating temperature of the inverter 200 when the inverter 200 is running; by setting the voltage collection unit 3002, the current collection unit 3004 and the temperature collection unit 3006, the output voltage, output current and operating temperature of the inverter 200 during operation can be collected simultaneously, avoiding the problem that a single collection module cannot collect multiple operating parameters at the same time, and can simultaneously detect abnormal working conditions that cause changes in the output voltage, output current and operating temperature during the operation of the inverter 200, thereby achieving the purpose of diversified abnormality detection. Among them, the output end of the voltage acquisition unit 3002, the output end of the current acquisition unit 3004 and the output end of the temperature acquisition unit 3006 are the output ends of the acquisition submodule 302, and the operation submodule 304 is also used to determine that the inverter 200 is in an abnormal voltage state when the output voltage meets the voltage preset condition, and generate an abnormal state signal representing the voltage abnormality, and the voltage abnormality includes overvoltage abnormality and undervoltage abnormality; the operation submodule 304 is also used to determine that the inverter 200 is in an abnormal current state when the output current meets the current preset condition, and generate an abnormal state signal representing the current abnormality, and the current abnormality includes overcurrent abnormality; it is also used to determine that the inverter is in an abnormal temperature state when the operating temperature meets the temperature preset condition, and generate an abnormal state signal representing the operating temperature abnormality, and the temperature abnormality includes overtemperature abnormality. At this time, the type of abnormal state of the inverter 200 can be obtained through the abnormal state signal, and then the cause of the abnormal working state can be found, thereby improving the working efficiency of the inverter 200, reducing the probability of damage to the inverter 200, and reducing the maintenance cost of the inverter 200 during operation.

[0062] In one embodiment, the operation submodule 304 is further used to determine that the inverter 200 is in an overvoltage state when the output voltage is greater than the first voltage threshold and maintained for a first preset time period, and to determine that the inverter 200 is in an undervoltage state when the output voltage is less than the second voltage threshold and maintained for a second preset time period; the operation submodule 304 is further used to determine that the inverter 200 is in an overcurrent state when the output current is greater than the current threshold and maintained for a third preset time period; the operation submodule 304 is further used to determine that the inverter 200 is in an overtemperature state when the operating temperature is greater than the temperature threshold and maintained for a fourth preset time period. In this way, the abnormal working state of the inverter 200 is refined, and the cause of the abnormal working state is found out easily.

[0063] Specifically, the first voltage threshold here is the maximum output voltage that is maintained for an unlimited time when the inverter 200 operates normally. When the time for which the inverter 200 continuously runs when the output voltage is greater than the first voltage threshold is less than the first preset time period, the inverter 200 operates normally without abnormalities. When the time for which the inverter 200 continuously runs when the output voltage is greater than the first voltage threshold is greater than or equal to the first preset time period, the inverter 200 will have an abnormality. The second voltage threshold here is the minimum output voltage that is maintained for an unlimited time when the inverter 200 operates normally. When the time for which the inverter 200 continuously runs when the output voltage is less than the second voltage threshold is less than the second preset time period, the inverter 200 will have no abnormalities. When the time for which the inverter 200 continuously runs when the output voltage is less than the second voltage threshold is greater than or equal to the second preset time period, the inverter 200 will have an abnormality. The current threshold here is the maximum output current that is not limited in time when the inverter 200 is operating normally. When the inverter 200 continuously operates for less than the third preset time period when the output current is greater than the current threshold, the inverter 200 is normal. When the inverter 200 continuously operates for more than or equal to the third preset time period when the output current is greater than the current threshold, the inverter 200 is abnormal. The temperature threshold here is the maximum operating temperature that is not limited in time when the inverter 200 is operating normally. When the inverter 200 continuously operates for less than the fourth preset time period when the operating temperature is greater than the temperature threshold, the inverter 200 is normal. When the inverter 200 continuously operates for more than or equal to the fourth preset time period when the operating temperature is greater than the temperature threshold, the inverter 200 is abnormal.

[0064] Figure 3 FIG. 1 is a structural block diagram of a control protection circuit of an inverter in another embodiment. Figure 3As shown, in one embodiment, the control protection circuit also includes: a status display module 500, which is connected to the signal acquisition control module 300, and is used to obtain and display the abnormal working state of the inverter 200 according to the abnormal state signal. The abnormal type of the inverter 200 can be directly obtained through the status display module 500, thereby reducing maintenance time and simplifying maintenance difficulty.

[0065] In one embodiment, the status display module 500 includes a setting module, and the status display module 500 performs different settings according to the abnormal working state represented by the abnormal state signal, and the abnormal working state includes at least one of the voltage abnormal state, the current abnormal state and the temperature abnormal state. Exemplarily, the abnormal working state includes the voltage abnormal state (overvoltage abnormality and undervoltage abnormality), the current abnormal state (overcurrent abnormality) and the temperature abnormal state (overtemperature abnormality). The setting of the status display module 500 includes the overvoltage protection flag, the overcurrent protection flag and the overtemperature protection flag. When the abnormal state signal represents the overvoltage state, the status display module 500 sets the overvoltage protection flag according to the received abnormal state signal; when the abnormal state signal represents the undervoltage abnormality, the status display module 500 sets the undervoltage protection flag according to the received abnormal state signal; when the abnormal state signal represents the overtemperature abnormality, the status display module 500 sets the overtemperature protection flag according to the received abnormal state signal. At this time, the abnormal working state that occurs when the inverter 200 is running can be known according to the setting of the status display module 500. In other embodiments, the status display module 500 includes a multi-color light, which is set differently according to the abnormal working state represented by the abnormal status signal, and the abnormal working state that occurs when the inverter 200 is running can be known according to the color displayed after the setting.

[0066] like Figure 3 As shown, in one embodiment, the control protection circuit also includes: a filtering module 600, the input end of the filtering module 600 is connected to the output end of the signal acquisition control module 300, and the output end of the filtering module 600 is connected to the input end of the self-locking module 400, and is used to obtain a filtered signal after filtering the abnormal state signal. The filtering module 600 can remove the interference signal in the abnormal state signal, thereby obtaining a filtered signal without interference, thereby avoiding the influence of the interference signal on the control protection circuit.

[0067] Continue to refer Figure 3In one embodiment, the control protection circuit further includes: a signal transmission module 700, the input end of the signal transmission module 700 is connected to the output end of the filter module 600, and the output end of the signal transmission module 700 is connected to the self-locking module 400, for transmitting the filtered signal to the self-locking module 400. The signal transmission module 700 can transmit the filtered signal obtained by removing the interference signal to the self-locking module 400, thereby realizing electrical isolation between the modules directly or indirectly connected to the input end of the signal transmission module 700 (such as the signal acquisition control module 300, the filter module 600 and the subsequent switch module 800) and the modules directly or indirectly connected to the output end of the signal transmission module 700 (such as the self-locking module 400 and the power supply light module 100), while not affecting the transmission of the signal, thereby increasing the anti-interference ability of the control protection circuit and the signal transmission efficiency.

[0068] like Figure 3 As shown, in one embodiment, the signal transmission module 700 includes a light-emitting device and a photosensitive device, the light-emitting device is the input end of the signal transmission module 700, and the photosensitive device is the output end of the signal transmission module 700, and the control protection circuit also includes: a switch module 800, the input end of the switch module 800 is connected to the output end of the filter module 600, and the output end of the switch module 800 is connected to the light-emitting device, and is used to control the opening and closing of the light-emitting device according to the filter signal; wherein the photosensitive device is connected to the self-locking module 400, and the opening and closing of the switch module 800 is controlled by the filter signal (abnormal state signal), thereby realizing the transmission of the filter signal (abnormal state signal) between the input end and the output end of the signal transmission module 700.

[0069] Figure 4 FIG. 1 is a partial circuit diagram of a control protection circuit of an inverter in an embodiment. Figure 4As shown, in one embodiment, the self-locking module 400 includes: a power supply submodule 402 and a setting submodule 404; one end of the power supply submodule 402 is connected to the signal acquisition control module 300, where the connection can be a direct connection or an indirect connection, and the other end of the power supply submodule 402 is connected to the power supply terminal K of the power management module 100, for generating a power supply signal according to the abnormal state signal; one end of the setting submodule 404 is connected to the signal acquisition control module 300, and the other end of the setting submodule 404 is connected to the feedback terminal Com of the power management module 100, for generating a setting signal according to the abnormal state signal; wherein the first control signal includes the power supply signal and the setting signal, both of which have the opposite level state to the abnormal state signal. Exemplarily, the abnormal state signal is at a high level, and the power supply signal and the setting signal are at a low level. The setting signal can avoid the risk of burning the control protection circuit when the first control signal is a power supply signal and the power supply signal winding has a strong load capacity.

[0070] like Figure 4 As shown, in one embodiment, the power supply submodule 402 includes a voltage-dividing resistor R1, a voltage-dividing resistor R2, a voltage-dividing resistor R3, a filter capacitor C1, a filter capacitor C2, a switch tube Q1 and a switch tube Q2; wherein, one end of the voltage-dividing resistor R1 is connected to the power supply terminal K of the power management circuit 100, and the other end of the voltage-dividing resistor R1 is connected to one end of the voltage-dividing resistor R2 and the input end of the switch tube Q1; the other end of the voltage-dividing resistor R2 is connected to the control end of the switch tube Q1, the input end of the switch tube Q2, and the signal acquisition control circuit 300; one end of the voltage-dividing resistor R3 is connected to the output end of the switch tube Q1 and the control end of the switch tube Q2; the other end of the voltage-dividing resistor R3 and the output end of the switch tube Q2 are connected to the high-voltage equivalent grounding terminal; the filter capacitor C1 is connected in parallel to both ends of the voltage-dividing resistor R2; the filter capacitor C2 is connected in parallel to both ends of the voltage-dividing resistor R3. The high voltage equivalent grounding terminal and the subsequent low voltage equivalent grounding terminal are both equivalent grounding terminals. The difference between the two is that the reference points are different. Among them, the high voltage equivalent grounding terminal is the equivalent grounding terminal of the high voltage, and the low voltage equivalent grounding terminal is the equivalent grounding terminal of the low voltage.

[0071] Exemplarily, the control protection circuit of the inverter also includes: a starting resistor, one end of the starting resistor is connected to the power supply terminal K of the power management circuit 100, the other end of the starting resistor is connected to one end of the voltage-dividing resistor R1, and a voltage-dividing resistor R0, one end of the voltage-dividing resistor R0 is connected to the power supply Vcc, and the other end of the voltage-dividing resistor R0 is connected to the other end of the starting resistor and one end of the voltage-dividing resistor R1; the switch tube Q1 and the switch tube Q2 are turned on and off according to the received abnormal state signal (filter signal), and when the switch tube Q1 and the switch tube Q2 are turned on, the power supply submodule 402 including the voltage-dividing resistor R1, the voltage-dividing resistor R2, the voltage-dividing resistor R3, the filter capacitor C1 and the filter capacitor C2 is turned on, and The series circuit formed by the power supply terminal K of the power management module 100 and the starting resistor is connected in parallel, and the power supply voltage provided by the power supply power source Vcc to the power supply submodule 402 becomes smaller (from the original power supply power source Vcc to the divided voltage of the power supply power source Vcc on the power supply submodule 402), and the total current of the power supply submodule 402 and the power supply terminal K of the power management module 100 remains unchanged. After the power supply submodule 402 is shunted, the power supply current of the starting resistor to the power supply terminal K of the power management module 100 (the power supply voltage provided to the power supply terminal K of the power management module 100) becomes smaller and locked, that is, a power supply signal is provided to the power supply terminal K of the power management module 100, and at the same time, the interference in the power supply submodule 402 can be filtered out by the filter capacitor.

[0072] Exemplarily, the switch tube Q1 and the switch tube Q2 are both thyristor switch tubes. After the switch tube Q1 and the switch tube Q2 are turned on, the power supply current of the power supply terminal K of the power management module 100 is locked and remains unchanged until the total power supply of the control protection circuit of the inverter 200 is turned off, and then the lock can be released. Exemplarily, the switch tube Q1 includes a PNP transistor, and the switch tube Q2 includes an NPN transistor.

[0073] In one embodiment, the setting submodule 404 includes: a diode D1, the anode of the diode D1 is connected to the feedback terminal Com of the power management module 100, and the cathode of the diode D1 is connected to the signal acquisition control module 300. The diode D1 provides a locked setting voltage to the feedback terminal Com of the power management module 100 according to the abnormal state signal (filtered signal), that is, provides a fixed setting signal to the feedback terminal Com of the power management module 100.

[0074] like Figure 4As shown, in one embodiment, the filter module 600 includes a filter resistor R6 and a filter capacitor C3, one end of the filter resistor R6 is connected to one end of the filter capacitor C3, and together serve as the input end of the filter module 600, the other end of the filter resistor R6 is the output end of the filter module 600, and the other end of the filter capacitor C3 is connected to the low-voltage equivalent grounding end, and the interference in the abnormal state signal can be filtered out by the filter resistor R6 and the filter capacitor C3.

[0075] like Figure 4 As shown, in one embodiment, the light-emitting device includes a light-emitting diode, and the photosensitive device includes a photosensitive transistor. In this case, the signal transmission module 700 is a photoelectric isolator, and the switch module 800 includes a voltage-dividing resistor R4, a voltage-dividing resistor R5, and a switch tube Q3; wherein one end of the voltage-dividing resistor R4 is connected to a power supply, and the power supply here is a constant voltage source with a constant voltage, such as a 5V battery, and the other end of the voltage-dividing resistor R4 is connected to the positive electrode of the light-emitting diode and one end of the voltage-dividing resistor R5; the other end of the voltage-dividing resistor R5 is connected to the negative electrode of the light-emitting diode, The input end of the switch tube Q3 is connected; the control end of the switch tube Q3 is connected to one end of the bias resistor R7 and one end of the filter capacitor C4, which together serve as the input end of the switch module 800; the output end of the switch tube Q3, the other end of the bias resistor R7, and the other end of the filter capacitor C4 are connected to the low-voltage equivalent grounding end, and the switch tube Q3 is turned on and off by the abnormal state signal (filter signal), thereby controlling the light emitting diode to emit light or not, and realizing the transmission of the abnormal state signal (filter signal) between the light emitting diode and the phototransistor. Exemplarily, the switch tube Q3 includes an NPN transistor.

[0076] like Figure 4 As shown, in one embodiment, the control protection circuit of the inverter also includes a feedback loop 900, which is connected to the feedback terminal Com of the power management module 100, and is used to feed back the control voltage output by the power management module 100 to the power management module 100, so as to implement regulation of the control voltage and reduce the fluctuation of the control voltage.

[0077] Figure 5 is a circuit diagram of an inverter in one embodiment, such as Figure 5As shown, the inverter 200 includes a photovoltaic panel 202, an energy storage battery 204, a first EMI filter 206, a second EMI filter 208, a boost circuit 210, a boost-buck circuit 212, a power inverter circuit 214 and a three-level drive circuit 216; the power management module 100 provides a DC voltage signal to the three-level drive circuit 216, and the three-level drive circuit 216 is used to control the opening and closing of the power inverter circuit 214 according to the received DC voltage signal; the photovoltaic panel 202 includes a solar cell, which is used to convert light energy into first electrical energy, and according to the power inverter circuit 214 Control to provide the first electric energy; the energy storage battery 204 is used to store the first electric energy provided by the photovoltaic panel 202 or provide the second electric energy to the load according to the control of the power inverter circuit 214; the first EMI filter 206 is used to filter out the radiation interference in the first electric energy; the second EMI filter 208 is used to filter out the radiation interference in the second electric energy; the boost circuit 210 boosts the first electric energy according to the control of the power inverter circuit 214; the boost-buck circuit 212 boosts the second electric energy according to the control of the power inverter circuit 214, or bucks the first electric energy that needs to be stored.

[0078] by Figure 4As an example, the working process of the control protection circuit of the inverter is described. Assuming that the inverter 200 is in an overvoltage state, the signal acquisition control module 300 acquires the output voltage of the inverter. When the output voltage is greater than the first voltage threshold and is maintained for a first preset time period, it is determined that the inverter 200 is in an overvoltage state, and an abnormal state signal Sigal_Crtl representing the overvoltage state is generated. Assuming that the abnormal state signal Sigal_Crtl is at a high level, the filter resistor R6 and the filter capacitor C3 filter out the interference in the abnormal state signal Sigal_Crtl to obtain a high-level filter signal. The switch tube Q3 is turned on according to the high-level filter signal, so that the light-emitting diode in the signal transmission module 700 emits light, and the photosensitive transistor is turned on when the light-emitting diode emits light, so as to realize the transmission of the filter signal; at this time, the self-locking module 400 receives the high-level filter signal; the diode D1 is connected to the low-level filter signal through the turned-on photosensitive transistor. The voltage-equivalent ground terminal is connected to the power management module 100, and a low-level setting signal is provided to the feedback terminal Com of the power management module 100; the switch tube Q1 and the switch tube Q2 are turned on under the control of the high-level filtering signal, and the power supply submodule 402 where the voltage-dividing resistor R1, the voltage-dividing resistor R2, the voltage-dividing resistor R3, the filter capacitor C1 and the filter capacitor C2 are located is turned on. At this time, the voltage across the power supply submodule 402 is the divided voltage of the power supply Vcc on the power supply submodule 402, that is, the power supply voltage provided to the power supply terminal K of the power management module 100 is pulled down from Vcc and locked at the divided voltage of the power supply Vcc on the power supply submodule 402, that is, a low-level power supply signal is provided to the power supply terminal K of the power management module 100; when the switch tube Q1 and the switch tube Q2 are thyristor switch tubes, the power supply Vcc always provides a low-level power supply signal to the power supply terminal K of the power management module 100 until the total power supply of the control protection circuit of the inverter is turned off, and then the unlocking is restored. The power management control module 100 turns off the PWM output according to the received low-level first control signal (set signal and power supply signal), that is, controls the inverter 200 to turn off to avoid overvoltage damage to the inverter 200.

[0079] An inverter system, comprising:

[0080] Inverter;

[0081] A control protection circuit for an inverter as described in any one of the above items.

[0082] In the description of this specification, the descriptions with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 specification.

[0084] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A control protection circuit for an inverter, characterized in that: include: A power management module, connected to the inverter, for providing a DC voltage signal to the inverter to control the operation and stop of the inverter; A signal acquisition control module, connected to the inverter, for acquiring operating parameters of the inverter, and determining that the inverter is in an abnormal working state when the operating parameters meet preset conditions, and generating an abnormal state signal; A self-locking module, connected to the signal acquisition control module and the power management module respectively, for generating a first control signal according to the abnormal state signal, wherein the first control signal is used to control the power management module to generate a DC voltage signal for controlling the inverter to stop; Wherein, the signal acquisition control module includes: A collection submodule, the input end of which is connected to the inverter and is used to collect the operating parameters; A calculation submodule, connected to the output end of the acquisition submodule, for determining that the inverter is in an abnormal working state and generating an abnormal state signal when the operating parameter meets the preset condition; The self-locking module comprises: A power supply submodule, one end of which is connected to the signal acquisition control module and the other end of which is connected to the power supply end of the power management module, and is used to generate a power supply signal according to the abnormal state signal; A setting submodule, one end of which is connected to the signal acquisition control module and the other end of which is connected to the feedback end of the power management module, and is used to generate a setting signal according to the abnormal state signal; The first control signal includes the power supply signal and the set signal, both of which have level states opposite to those of the abnormal state signal.

2. The control protection circuit of the inverter according to claim 1, characterized in that: The operating parameters include at least one of output voltage, output current and operating temperature. When any one of the operating parameters meets a preset condition, the signal acquisition control module determines that the inverter is in an abnormal operating state.

3. The control protection circuit of the inverter according to claim 1, characterized in that: The operating parameters include output voltage, output current and operating temperature, and the acquisition submodule includes: A voltage collection unit, wherein an input end of the voltage collection unit is connected to the inverter and is used to collect an output voltage of the inverter when the inverter is running; A current collection unit, wherein an input end of the current collection unit is connected to the inverter and is used to collect an output current of the inverter when the inverter is running; A temperature acquisition unit, wherein an input end of the temperature acquisition unit is connected to the inverter and is used to acquire the operating temperature of the inverter when the inverter is running; The operation submodule is further used to determine that the inverter is in an abnormal voltage state and generate the abnormal state signal when the output voltage meets the preset voltage condition; it is also used to determine that the inverter is in an abnormal current state and generate the abnormal state signal when the output current meets the preset current condition; it is also used to determine that the inverter is in an abnormal temperature state and generate the abnormal state signal when the operating temperature meets the preset temperature condition; Among them, the output end of the voltage acquisition unit, the output end of the current acquisition unit and the output end of the temperature acquisition unit are the output ends of the acquisition submodule.

4. The control protection circuit of the inverter according to claim 3, characterized in that: The operation submodule is also used to determine that the inverter is in an overvoltage state when the output voltage is greater than a first voltage threshold and is maintained for a first preset time period, and to determine that the inverter is in an undervoltage state when the output voltage is less than a second voltage threshold and is maintained for a second preset time period; the operation submodule is also used to determine that the inverter is in an overcurrent state when the output current is greater than a current threshold and is maintained for a third preset time period; the operation submodule is also used to determine that the inverter is in an overtemperature state when the operating temperature is greater than a temperature threshold and is maintained for a fourth preset time period.

5. The control protection circuit of the inverter according to claim 1, characterized in that: The power supply submodule includes a voltage divider resistor R1, a voltage divider resistor R2, a voltage divider resistor R3, a filter capacitor C1, a filter capacitor C2, a switch tube Q1 and a switch tube Q2; Among them, one end of the voltage-dividing resistor R1 is connected to the power supply end of the power management module, and the other end of the voltage-dividing resistor R1 is connected to one end of the voltage-dividing resistor R2 and the input end of the switch tube Q1; the other end of the voltage-dividing resistor R2 is connected to the control end of the switch tube Q1, the input end of the switch tube Q2, and the signal acquisition control module; one end of the voltage-dividing resistor R3 is connected to the output end of the switch tube Q1 and the control end of the switch tube Q2; the other end of the voltage-dividing resistor R3 and the output end of the switch tube Q2 are connected to the high-voltage equivalent grounding end; the filter capacitor C1 is connected in parallel to both ends of the voltage-dividing resistor R2; the filter capacitor C2 is connected in parallel to both ends of the voltage-dividing resistor R3.

6. The control protection circuit of the inverter according to claim 1, characterized in that: The positioning submodule comprises: A diode D1, wherein the anode of the diode D1 is connected to the feedback end of the power management module, and the cathode of the diode D1 is connected to the signal acquisition control module.

7. The control protection circuit of the inverter according to any one of claims 1 to 6, characterized in that: The control protection circuit also includes: A filtering module, wherein the input end of the filtering module is connected to the output end of the signal acquisition control module, and the output end of the filtering module is connected to the input end of the self-locking module, and is used to obtain a filtered signal after filtering the abnormal state signal.

8. The control protection circuit of the inverter according to claim 7, characterized in that: The filtering module includes a filtering resistor R6 and a filtering capacitor C3, one end of the filtering resistor R6 is connected to one end of the filtering capacitor C3, and together serve as the input end of the filtering module, the other end of the filtering resistor R6 is the output end of the filtering module, and the other end of the filtering capacitor C3 is connected to the low-voltage equivalent grounding end.

9. The control protection circuit of the inverter according to claim 7, characterized in that: The control protection circuit also includes: A signal transmission module, wherein the input end of the signal transmission module is connected to the output end of the filtering module, and the output end of the signal transmission module is connected to the self-locking module, and is used to transmit the filtered signal to the self-locking module.

10. The control protection circuit of the inverter according to claim 9, wherein the signal transmission module comprises a light emitting device and a photosensitive device, and the control protection circuit further comprises: A switch module, wherein an input end of the switch module is connected to an output end of the filter module, and an output end of the switch module is connected to the light emitting device, and is used to control the turning on and off of the light emitting device according to the filter signal; Wherein, the photosensitive device is connected to the self-locking module.

11. The control protection circuit of the inverter according to claim 10, characterized in that: The light emitting device includes a light emitting diode, the photosensitive device includes a phototransistor, and the switch module includes a voltage dividing resistor R4, a voltage dividing resistor R5, a switch tube Q3, a bias resistor R7 and a filter capacitor C4; Among them, one end of the voltage-dividing resistor R4 is connected to the power supply, and the other end of the voltage-dividing resistor R4 is connected to the positive electrode of the light-emitting diode and one end of the voltage-dividing resistor R5; the other end of the voltage-dividing resistor R5 is connected to the negative electrode of the light-emitting diode and the input end of the switch tube Q3; the control end of the switch tube Q3 is connected to one end of the bias resistor R7 and one end of the filter capacitor C4, and together serve as the input end of the switch module; the output end of the switch tube Q3, the other end of the bias resistor R7, and the other end of the filter capacitor C4 are connected to the low-voltage equivalent grounding end.

12. The control protection circuit of the inverter according to claim 1, characterized in that: The control protection circuit also includes: A status display module is connected to the signal acquisition control module and is used to acquire and display the abnormal working state of the inverter according to the abnormal state signal.

13. An inverter system, characterized in that: include: Inverter; A control protection circuit for an inverter as claimed in any one of claims 1 to 12.

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