Monitoring device of power module and power system

Abstract

The utility model discloses a monitoring device of a power module and a power system. The monitoring device of the power module comprises a first sampling module which is connected with the power module and is used for collecting a first electric signal of the power module; the control module is connected with the first sampling module, and the control module is used for controlling the power module to be turned off under the condition that the difference value between the first electric signal and the preset voltage is larger than a set threshold value; when the difference value between the first electric signal and the preset voltage is smaller than or equal to a set threshold value, the voltage of the power module is adjusted; the second sampling module is connected between the power module and the control module and is used for collecting a feedback signal of the power module and inputting the feedback signal into the control module; wherein the feedback signal is a voltage value of the power module after voltage regulation; the control module is used for controlling the power module to output target power according to the feedback signal. According to the technical scheme provided by the embodiment of the utility model, the applicability of the monitoring device of the power module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a monitoring device for a power module and a power system. Background Art

[0002] With the rapid development of power electronic devices, a large number of power modules based on power electronic devices have been put into use. Current power electronic devices have many different types of topologies, such as two-level, three-level and H-bridge. Therefore, different monitoring devices need to be matched for each topology to ensure the reliable operation of the power module.

[0003] However, the monitoring equipment provided by the prior art can only monitor power modules of one type of topology structure. When a system has power modules of multiple types of topologies, multiple monitoring equipment needs to be set up. Therefore, the existing power module monitoring device has poor applicability. Utility Model Content

[0004] The utility model provides a monitoring device for a power module and a power system, so as to solve the problem of poor applicability of the monitoring device for the power module.

[0005] According to one aspect of the utility model, a monitoring device for a power module is provided, comprising:

[0006] A first sampling module, connected to the power module, and used to collect a first electrical signal from the power module;

[0007] a control module connected to the first sampling module, the control module being used to control the power module to shut down when the difference between the first electrical signal and the preset voltage is greater than a set threshold; and to adjust the voltage of the power module when the difference between the first electrical signal and the preset voltage is less than or equal to the set threshold;

[0008] The second sampling module is connected between the power module and the control module, and is used to collect the feedback signal of the power module and input it into the control module; wherein the feedback signal is the voltage value after the power module performs voltage regulation; the control module is used to control the power module to output the target power according to the feedback signal.

[0009] Optionally, the first sampling module includes:

[0010] At least two input optical couplers are connected between the power supply input end of the power module and the control module, and the input optical couplers are used to collect the first electrical signal from the power supply input end and input the first electrical signal into the control module.

[0011] Optionally, the second sampling module includes:

[0012] At least two input photoelectric converters are connected between the driving circuit of the power module and the control module. The input photoelectric converters are used to collect feedback signals output by the driving circuit and convert the feedback signals into electrical signals before inputting them into the control module.

[0013] Optionally, the monitoring device for the power module further includes:

[0014] A unidirectional conduction module, connected between the power module and the control module, the unidirectional conduction module is used to transmit the first control signal output by the control module to the power module and control the power module to shut down;

[0015] A signal conversion module is connected between the power module and the control module, and is used to convert the second control signal output by the control module into an optical signal, and the optical signal is used to adjust the voltage of the power module.

[0016] Optionally, the one-way conduction module includes:

[0017] at least two output optical couplers; the power module comprises a main switch, the drive circuit and a power electronic device; the drive circuit is connected to the power electronic device and is used to drive the power electronic device to perform power regulation;

[0018] The input end of the main switch is connected to the power supply input end of the power module, the control end of the main switch is connected to the output optical coupler, and the output end of the main switch is connected to the drive circuit;

[0019] The output optical coupler is connected to the control module, and is used to input the first control signal into the control end of the main switch and control the main switch to be turned off.

[0020] Optionally, the signal conversion module includes:

[0021] At least two output photoelectric converters are connected between the control module and the driving circuit of the power module, and are used to convert the second control signal into an optical signal, input the optical signal into the driving circuit of the power module, and adjust the voltage of the power module.

[0022] Optionally, the monitoring device for the power module further includes:

[0023] A third sampling module, connected between the control module and the bus-side sensor of the power module, and used for collecting a second electrical signal output by the bus-side sensor;

[0024] The third sampling module includes: at least two signal conditioning units connected to the bus-side sensor, and used to collect the second electrical signal and reduce the voltage of the second electrical signal;

[0025] an analog-to-digital conversion unit, connected between the signal conditioning unit and the control module, and configured to convert the stepped-down second electrical signal into a digital signal and input the digital signal into the control module;

[0026] The control module is also used to generate a third control signal when the difference between the second electrical signal and the preset bus voltage is greater than a set threshold, and output the third control signal through the unidirectional conduction module and / or the signal conversion module, and the third control signal is used to control the power module to shut down.

[0027] Optionally, the control module includes:

[0028] a processor unit, connected to the first sampling module and the unidirectional conduction module, and configured to collect the first electrical signal and generate the first control signal and / or the second control signal;

[0029] a programmable logic unit, connected to the second sampling module, the signal conversion module, the third sampling module and the processor unit, and configured to collect the feedback signal and send it to the processor unit;

[0030] The programmable logic unit is further used to collect the second electrical signal and send it to the processor unit, and the processor unit generates the third control signal according to the second electrical signal;

[0031] The programmable logic unit acquires the feedback signal and the second electrical signal at a speed faster than the processor unit acquires the first electrical signal.

[0032] According to another aspect of the present invention, a power system is provided, comprising: at least one power module and at least one monitoring device for the power module as described in any embodiment of the present invention.

[0033] Optionally, the power system comprises: at least two of the power modules and at least two monitoring devices of the power modules;

[0034] The monitoring devices of the power modules are arranged and connected to the power modules in a one-to-one correspondence; the monitoring devices are connected in cascade and perform data transmission;

[0035] The control module of the monitoring device of the power module is used to generate different second control signals according to the data, and different second control signals correspond to different target powers output by the power module.

[0036] The technical solution provided by the embodiment of the utility model realizes voltage detection of the power module by setting a first sampling module. When the voltage of the power module is too high, the power module can be shut down by the control module, thereby protecting the power module from overvoltage. By setting a second sampling module, feedback detection of the voltage regulation of the power module is realized, and the output power of the power module is continuously adjusted according to the feedback signal until the set target power is reached. The power module monitoring device provided by the embodiment of the utility model has high applicability to power modules of different topological structures. By connecting the first sampling module and the second sampling module with different types of power modules, the first electrical signal and the feedback signal of the power module can be detected, thereby realizing control of different power modules, and the control process is simple and efficient.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of a monitoring device for a power module provided according to an embodiment of the utility model;

[0040] Figure 2 It is a structural schematic diagram of another power module monitoring device provided according to an embodiment of the utility model;

[0041] Figure 3 It is a structural schematic diagram of another power module monitoring device provided according to an embodiment of the utility model;

[0042] Figure 4 It is a structural schematic diagram of another power module monitoring device provided according to an embodiment of the utility model;

[0043] Figure 5 It is a structural schematic diagram of another power module monitoring device provided according to an embodiment of the utility model;

[0044] Figure 6 It is a structural schematic diagram of a power system provided according to an embodiment of the utility model;

[0045] Figure 7 It is a structural schematic diagram of another power system provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] An embodiment of the utility model provides a monitoring device for a power module. Figure 1 A schematic diagram of the structure of a power module monitoring device provided by an embodiment of the utility model. Figure 1 , the monitoring device of the power module includes: a first sampling module 1, a control module 3 and a second sampling module 2. The first sampling module 1 is connected to the power module 4, and is used to collect the first electrical signal of the power module 4. The control module 3 is connected to the first sampling module 1, and the control module 3 is used to control the power module 4 to shut down when the difference between the first electrical signal and the preset voltage is greater than the set threshold; and to adjust the voltage of the power module 4 when the difference between the first electrical signal and the preset voltage is less than or equal to the set threshold. The second sampling module 2 is connected between the power module 4 and the control module 3, and is used to collect the feedback signal of the power module 4 and input it into the control module 3; wherein the feedback signal is the voltage value after the power module 4 is adjusted; the control module 3 is used to control the power module 4 to output the target power according to the feedback signal.

[0049] Among them, the power module 4 can be used to convert the input electrical energy into different forms of electrical energy. For example, AC to DC, DC to AC, etc. The power of the electrical energy can also be adjusted. When the power module 4 is running, the first sampling module 1 can sample the first electrical signal of the power module 4 and input it into the control module 3. The first electrical signal can be the input voltage of the power module. When the control module 3 detects that the difference between the first electrical signal and the preset voltage value is greater than the set threshold, the control module 3 can control the power module 4 to shut down, which is equivalent to cutting off the connection between the power module 4 and the power supply, thereby preventing the power module 4 from being damaged due to excessive voltage.

[0050] When the control module 3 detects that the difference between the first electrical signal and the preset voltage value is less than or equal to the set threshold, it means that the voltage of the power module 4 is a normal value, and at this time, the power module 4 can operate normally. The control module 3 controls the power module 4 to adjust the voltage, and collects the feedback signal of the power module 4 through the second sampling module 2. The control module 3 continues to adjust the power module 4 according to the feedback signal until the output power of the power module 4 reaches the set target power.

[0051] The power module 4 can control the opening or closing of each power electronic device in the power module 4 through the built-in driving circuit, thereby realizing the voltage regulation. Exemplarily, the power electronic device may include a variety of topological structures, such as H-bridge IGBT (Insulated Gate Bipolar Transistor), three-level IGBT, two-level IGBT, H-bridge IGCT (Integrated Gate-Commutated Thyristor), two-level IGCT and three-level IGCT and other devices. The first sampling module 1 and the second sampling module 2 provided by the utility model can be directly connected to the power module 4, and the collected signal is input into the control module 3, thereby realizing the control of the power module 4 by the monitoring device, without the need to replace different monitoring devices for different topological structures, and has good applicability.

[0052] The technical solution provided by the embodiment of the utility model realizes the voltage detection of the power module 4 by setting the first sampling module 1. When the voltage of the power module 4 is too high, the power module 4 can be shut down by the control module 3, so as to protect the power module 4 from overvoltage. By setting the second sampling module 2, feedback detection of the voltage regulation of the power module 4 is realized, and the output power of the power module 4 is continuously adjusted according to the feedback signal until the set target power is reached. The power module monitoring device provided by the embodiment of the utility model has high applicability to power modules 4 of different topological structures. By connecting the first sampling module 1 and the second sampling module 2 with different types of power modules 4, the first electrical signal and the feedback signal of the power module 4 can be detected, and then the control of different power modules 4 can be realized. The control process is simple and efficient.

[0053] Figure 2 This is a schematic diagram of the structure of another power module monitoring device provided by an embodiment of the utility model. Figure 2 On the basis of the above embodiments, optionally, the first sampling module 1 includes: at least two input optical couplers 11, connected between the power supply input end of the power module 4 and the control module 3, the input optical coupler 11 is used to collect the first electrical signal of the power supply input end, and input the first electrical signal into the control module 3.

[0054] The input optical coupler 11 has a unidirectional transmission property of the signal, which can be used to prevent reverse interference of the signal and prevent the first electrical signal from being interfered by the outside world or leaking electricity during the transmission process, thereby ensuring the accuracy of the first electrical signal.

[0055] The number of input optical couplers 11 can be multiple to match different power modules 4. For example, when the power module 4 can be connected to the control module 3 through only one input optical coupler 11, other input optical couplers 11 can be used as backup. This setting can improve the applicability and reliability of the monitoring device.

[0056] Continue to refer Figure 2 On the basis of the above embodiments, optionally, the second sampling module 2 includes: at least two input photoelectric converters 21, connected between the driving circuit of the power module 4 and the control module 3, the input photoelectric converter 21 is used to collect the feedback signal output by the driving circuit, and convert the feedback signal into an electrical signal and then input it into the control module 3.

[0057] The number of input photoelectric converters 21 can be adaptively increased or decreased according to different types of power modules 4. For example, when the power electronic device is an H-bridge IGBT, it can be connected to the control module 3 through three input photoelectric converters 21, and when the power electronic device is a three-level IGCT, it can be connected to the control module 3 through six input photoelectric converters 21.

[0058] After the driving circuit controls each power electronic device in the power module 4 to adjust the voltage, it outputs a feedback signal, which may be an optical signal. The input photoelectric converter 21 is a photoelectric conversion device for optical fiber communication, which may be used to convert the feedback signal into an electrical signal and input it into the control module 3, thereby enabling the control module 3 to read the feedback signal.

[0059] Figure 3 A schematic diagram of the structure of another power module monitoring device provided by an embodiment of the utility model. Figure 3 On the basis of the above embodiments, optionally, the monitoring device of the power module further includes: a unidirectional conduction module 5 and a signal conversion module 6. The unidirectional conduction module 5 is connected between the power module 4 and the control module 3, and is used to transmit the first control signal output by the control module 3 to the power module 4 and control the power module 4 to shut down. The signal conversion module 6 is connected between the power module 4 and the control module 3, and is used to convert the second control signal output by the control module 3 into an optical signal, and the optical signal is used to adjust the voltage of the power module 4.

[0060] When the control module 3 detects that the difference between the first electrical signal and the preset voltage value is greater than the set threshold, the control module 3 can generate a first control signal. By setting the unidirectional conduction module 5, the first control signal can be input into the power module 4, and the control module 3 cuts off the connection between the power module 4 and the power supply according to the first control signal to prevent the power module 4 from being damaged due to overvoltage.

[0061] When the control module 3 detects that the difference between the first electrical signal and the preset voltage value is less than or equal to the set threshold value, it means that the voltage of the power module 4 is a normal value, and at this time, the power module 4 can operate normally. The control module 3 can generate a second control signal, and the second control signal is used to control the power module 4 to adjust the voltage. Exemplarily, the second control signal can be an electrical signal, and the electrical signal can be converted into an optical signal by setting the signal conversion module 6, and the voltage of the power module 4 can be adjusted. Compared with electrical signals, the control method using optical signals has a faster transmission speed and a more effective control effect.

[0062] Continue to refer Figure 3, based on the above embodiments, optionally, the unidirectional conduction module 5 includes: at least two output optical couplers 51. The power module 4 includes a main switch, a drive circuit and a power electronic device; the drive circuit is connected to the power electronic device and is used to drive the power electronic device to perform power regulation. The input end of the main switch is connected to the power supply input end of the power module 4, the control end of the main switch is connected to the output optical coupler 51, and the output end of the main switch is connected to the drive circuit. The output optical coupler 51 is connected to the control module 3, and the output optical coupler 51 is used to input the first control signal into the control end of the main switch and control the main switch to turn off.

[0063] The output optical coupler 51 has a signal transmission direction opposite to that of the input optical coupler 11, and is used to output the first control signal. Exemplarily, the output optical coupler 51 can be configured to have the same structure as the input optical coupler 11. Therefore, the output optical coupler 51 also has a unidirectional transmission property of the signal, which can be used to prevent reverse interference of the first control signal. It can also prevent the first control signal from being interfered with by other factors or leakage during transmission, thereby ensuring the accuracy of the first control signal.

[0064] The output optical coupler 51 is connected to the control end of the main switch. When the main switch is turned on, the electric energy can be transmitted to the drive circuit, so that the drive circuit can drive each power electronic device to adjust the voltage. When the control module 3 outputs the first control signal, it indicates that the electric energy input to the power module 4 is abnormal. The control end of the main switch receives the first control signal and disconnects the main switch, thereby cutting off the power supply of the power module 4, so that the power module 4 can be reliably turned off by the first control signal.

[0065] Continue to refer Figure 3 On the basis of the above embodiments, optionally, the signal conversion module 6 includes: at least two output photoelectric converters 61, connected between the control module 3 and the driving circuit of the power module 4, for converting the second control signal into an optical signal, inputting the optical signal into the driving circuit of the power module 4, and adjusting the voltage of the power module 4.

[0066] Among them, the output photoelectric converter 61 is a photoelectric conversion device that can convert an electrical signal into an optical signal. By setting the output photoelectric converter 61, the second control signal sent by the control module 3 can be converted from an electrical signal to an optical signal, and input into the driving circuit of the power module 4, thereby driving each power electronic device to adjust the voltage. Compared with the control method that directly uses electrical signals, this setting method has a faster control speed and makes the adjustment of power electronic devices more accurate.

[0067] Figure 4 A schematic diagram of the structure of another power module monitoring device provided by an embodiment of the utility model. Figure 4On the basis of the above embodiments, optionally, the monitoring device of the power module further includes: a third sampling module 7, connected between the control module 3 and the bus-side sensor of the power module 4, for collecting the second electrical signal output by the bus-side sensor. The third sampling module 7 includes: an analog-to-digital conversion unit 72 and at least two signal conditioning units 71. The signal conditioning unit 71 is connected to the bus-side sensor, for collecting the second electrical signal and reducing the voltage of the second electrical signal. The analog-to-digital conversion unit 72 is connected between the signal conditioning unit 71 and the control module 3, for converting the reduced-voltage second electrical signal into a digital signal, and inputting it into the control module 3. The control module 3 is also used to generate a third control signal when the difference between the second electrical signal and the preset bus voltage is greater than a set threshold, and output the third control signal through the unidirectional conduction module 5 and / or the signal conversion module 6, and the third control signal is used to control the power module 4 to shut down.

[0068] Among them, the signal conditioning unit 71 is used to collect the second electrical signal detected by the bus side sensor. Since the second electrical signal is the voltage on the bus side and has a higher voltage value, the second electrical signal can be reduced in voltage by setting the signal conditioning unit 71, and the reduced-voltage second electrical signal can be converted into a digital signal through the analog-to-digital conversion unit 72 to convert it into a signal value applicable to the control module 3.

[0069] The signal conditioning unit 71 may be provided in a plurality. Exemplarily, the bus side sensor may include a voltage sensor and a current sensor. Each sensor may be connected to a corresponding signal conditioning unit 71, thereby realizing simultaneous detection of the bus current and bus voltage. The signal conditioning unit 71 may also be provided with a certain margin, and the redundant signal conditioning unit 71 may be used as a backup.

[0070] When the control module 3 detects that the voltage on the bus side is too high, a third control signal is generated. In order to protect the power module 4 to the greatest extent, the signal conversion module 6 and the unidirectional conduction module 5 can simultaneously receive and transmit the third control signal, and drive each power electronic device to shut down through the drive circuit to adjust the voltage to zero. At the same time, the control end of the main switch controls the main switch to shut down, cutting off the power supply of the power module 4, thereby preventing the bus side voltage from damaging the power module 4.

[0071] Figure 5 A schematic diagram of the structure of another power module monitoring device provided by an embodiment of the utility model. Figure 5On the basis of the above embodiments, the control module 3 optionally includes: a processor unit 31 and a programmable logic unit 32. The processor unit 31 is connected to the first sampling module 1 and the unidirectional conduction module 5, and is used to collect the first electrical signal and generate the first control signal and / or the second control signal. The programmable logic unit 32 is connected to the second sampling module 2, the signal conversion module 6, the third sampling module 7 and the processor unit 31, and is used to collect the feedback signal and send it to the processor unit 31. The programmable logic unit 32 is also used to collect the second electrical signal and send it to the processor unit 31, and the processor unit 31 generates the third control signal according to the second electrical signal. Among them, the acquisition speed of the feedback signal and the second electrical signal by the programmable logic unit 32 is greater than the acquisition speed of the first electrical signal by the processor unit 31.

[0072] Among them, when the first sampling module 1 collects the first electrical signal, if the difference between the first electrical signal and the preset voltage value is greater than the set threshold, the processor unit 31 generates a first control signal, and directly inputs the control end of the main switch through the unidirectional conduction module 5, so that the main switch cuts off the connection with the power supply to prevent damage to the power module 4 due to overvoltage. Exemplarily, the processor unit 31 can be ARM (Advanced RISC Machines), DSP (Digital Signal Processor), MCU (Microcontroller Unit), etc.

[0073] If the difference between the first electrical signal and the preset voltage value is less than or equal to the set threshold, the processor unit 31 generates a second control signal and inputs it into the programmable logic unit 32. The programmable logic unit 32 quickly processes the second control signal, transmits it to the signal conversion module 6, and controls and drives each power electronic device to perform voltage regulation. After voltage regulation, the programmable logic unit 32 can also receive a feedback signal issued by the drive circuit, which is sent to the processor unit 31 by the programmable logic unit 32. If the output power of the power module 4 does not reach the target power, the processor unit 31 continues to control the power module 4 to perform voltage regulation until the output power of the power module 4 reaches the target power. Exemplarily, the programmable logic unit 32 can be an FPGA (Field-Programmable Gate Array).

[0074] The embodiment of the utility model also provides a power system. Figure 6 A schematic diagram of a power system provided by an embodiment of the utility model. Figure 6The power system includes: at least one power module 4 and at least one monitoring device for the power module as provided in any embodiment of the utility model. The beneficial effects of the monitoring device for the power module provided in any of the above embodiments are not described here.

[0075] Figure 6 The structure of two monitoring devices and two power modules 4 is exemplarily shown. The data of one monitoring device can be output through the output photoelectric converter 61 and received by the input photoelectric converter 21 of another connected monitoring device, thereby realizing data interaction.

[0076] Figure 7 A schematic diagram of another power system provided by an embodiment of the utility model. Figure 6 and Figure 7 The power system includes: at least two power modules 4 and at least two monitoring devices for the power modules. The monitoring devices for the power modules are arranged and connected to the power modules 4 in a one-to-one correspondence; the monitoring devices are cascaded and transmit data. The control module 3 of the monitoring device for the power module is used to generate different second control signals according to the data, and different second control signals correspond to different target powers output by the power modules 4.

[0077] in, Figure 7 The example shows a signal conversion module 6 having six output photoelectric converters 61 and a second sampling module 2 having six input photoelectric converters 21. The two power modules are cascade-connected via the input photoelectric converters 21 and the output photoelectric converters 61. The two control modules 3 can perform data transmission via the input photoelectric converters 21 and the output photoelectric converters 61.

[0078] Exemplarily, when the power system has 6 power modules 4 and corresponding monitoring devices for 6 power modules are set, the 6 control modules 3 can generate different second control signals according to the different functions of each power module 4. For example, the control module 3 can generate different operating schedules according to the functions of each power module 4. When the power system needs to invert the electric energy input to the system after rectification. The control module 3 outputs a second control signal to control the power of each power module 4 used for rectification to adjust the power. After the rectification is completed, the control module 3 outputs a different second control signal to control the power of each power module 4 used for inversion to adjust the power. Multiple power modules 4 can have the same topology or different topologies. Through this setting method, time-sharing control of multiple power modules 4 can be achieved, so that each power module 4 can work in coordination, and then the power system can achieve different functions, which has high applicability.

[0079] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0080] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A monitoring device for a power module, characterized in that: include: A first sampling module, connected to the power module, and used to collect a first electrical signal from the power module; a control module connected to the first sampling module, the control module being used to control the power module to shut down when the difference between the first electrical signal and the preset voltage is greater than a set threshold; and to adjust the voltage of the power module when the difference between the first electrical signal and the preset voltage is less than or equal to the set threshold; The second sampling module is connected between the power module and the control module, and is used to collect the feedback signal of the power module and input it into the control module; wherein the feedback signal is the voltage value after the power module performs voltage regulation; the control module is used to control the power module to output the target power according to the feedback signal.

2. The monitoring device for a power module according to claim 1, characterized in that: The first sampling module comprises: At least two input optical couplers are connected between the power supply input end of the power module and the control module, and the input optical couplers are used to collect the first electrical signal from the power supply input end and input the first electrical signal into the control module.

3. The monitoring device for a power module according to claim 1, characterized in that: The second sampling module comprises: At least two input photoelectric converters are connected between the driving circuit of the power module and the control module. The input photoelectric converters are used to collect feedback signals output by the driving circuit and convert the feedback signals into electrical signals before inputting them into the control module.

4. The monitoring device for a power module according to claim 3, characterized in that: The monitoring device of the power module also includes: A unidirectional conduction module, connected between the power module and the control module, the unidirectional conduction module is used to transmit the first control signal output by the control module to the power module and control the power module to shut down; A signal conversion module is connected between the power module and the control module, and is used to convert the second control signal output by the control module into an optical signal, and the optical signal is used to adjust the voltage of the power module.

5. The monitoring device for a power module according to claim 4, characterized in that: The one-way conduction module comprises: at least two output optical couplers; the power module comprises a main switch, the drive circuit and a power electronic device; the drive circuit is connected to the power electronic device and is used to drive the power electronic device to perform power regulation; The input end of the main switch is connected to the power supply input end of the power module, the control end of the main switch is connected to the output optical coupler, and the output end of the main switch is connected to the drive circuit; The output optical coupler is connected to the control module, and is used to input the first control signal into the control end of the main switch and control the main switch to be turned off.

6. The monitoring device for a power module according to claim 4, characterized in that: The signal conversion module comprises: At least two output photoelectric converters are connected between the control module and the driving circuit of the power module, and are used to convert the second control signal into an optical signal, input the optical signal into the driving circuit of the power module, and adjust the voltage of the power module.

7. The monitoring device for a power module according to claim 4, characterized in that: The monitoring device of the power module also includes: A third sampling module, connected between the control module and the bus-side sensor of the power module, and used for collecting a second electrical signal output by the bus-side sensor; The third sampling module includes: at least two signal conditioning units connected to the bus-side sensor, and used to collect the second electrical signal and reduce the voltage of the second electrical signal; an analog-to-digital conversion unit, connected between the signal conditioning unit and the control module, and configured to convert the stepped-down second electrical signal into a digital signal and input the digital signal into the control module; The control module is also used to generate a third control signal when the difference between the second electrical signal and the preset bus voltage is greater than a set threshold, and output the third control signal through the unidirectional conduction module and / or the signal conversion module, and the third control signal is used to control the power module to shut down.

8. The monitoring device for a power module according to claim 7, characterized in that: The control module comprises: a processor unit, connected to the first sampling module and the unidirectional conduction module, and configured to collect the first electrical signal and generate the first control signal and / or the second control signal; a programmable logic unit, connected to the second sampling module, the signal conversion module, the third sampling module and the processor unit, and configured to collect the feedback signal and send it to the processor unit; The programmable logic unit is further used to collect the second electrical signal and send it to the processor unit, and the processor unit generates the third control signal according to the second electrical signal; The programmable logic unit acquires the feedback signal and the second electrical signal at a speed faster than the processor unit acquires the first electrical signal.

9. A power system, characterized in that: include: At least one power module and at least one monitoring device for the power module according to any one of claims 1-8.

10. The power system according to claim 9, characterized in that: The power system comprises: at least two of the power modules and at least two monitoring devices of the power modules; The monitoring devices of the power modules are arranged and connected to the power modules in a one-to-one correspondence; the monitoring devices are connected in cascade and perform data transmission; The control module of the monitoring device of the power module is used to generate different second control signals according to the data, and different second control signals correspond to different target powers output by the power module.

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