IGBT fault feedback signal circuit, frequency converter and frequency conversion control equipment

Abstract

The present application relates to an IGBT fault feedback signal circuit, a frequency converter and a frequency conversion control device, and belongs to the field of IGBT fault feedback technology. The present application includes: a plurality of IGBT modules; a voltage divider circuit module connected to the plurality of IGBT modules, wherein when each IGBT module works normally, the voltage divider circuit module outputs a normal voltage divider signal through an output terminal, and when one or more IGBT modules fail, the voltage divider circuit module outputs a fault voltage divider signal representing the failed IGBT module through the output terminal. Through the present application, it is helpful to clarify the source of the IGBT module failure, and at the same time, it is helpful to improve the interface utilization and maintenance efficiency of the main control chip.

Description

Technical Field

[0001] The present application belongs to the technical field of IGBT fault feedback, and specifically relates to an IGBT fault feedback signal circuit, a frequency converter and a frequency conversion control device. Background Art

[0002] At present, inverter products (such as photovoltaic inverters) have rectifier modules and inverter modules, which require more and more IGBT modules, which objectively increases the failure rate of IGBT modules. For a large number of IGBT modules (such as more than a dozen IGBT modules), the transmission of their fault feedback signals becomes a problem. In order to improve the system protection speed, we usually protect each IGBT module by means of parallel connection such as AND gate circuits, but it is impossible to analyze which specific IGBT module is damaged, and the transmission of each module alone will cause a large amount of main control chip interface investment. Summary of the invention

[0003] In order to overcome the problems existing in the related art to at least a certain extent, the present application provides an IGBT fault feedback signal circuit, a frequency converter and a frequency conversion control device, which helps to clarify the source of the IGBT module failure, and at the same time helps to improve the interface utilization and maintenance efficiency of the main control chip.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] First,

[0006] The present application provides an IGBT fault feedback signal circuit, comprising:

[0007] Multiple IGBT modules;

[0008] A voltage divider circuit module is connected to the plurality of IGBT modules, wherein when each of the IGBT modules operates normally, the voltage divider circuit module outputs a normal voltage divider signal through an output end, and when one or more of the IGBT modules fails, the voltage divider circuit module outputs a fault voltage divider signal representing the faulty IGBT module through the output end.

[0009] Furthermore, the voltage divider circuit module includes:

[0010] A plurality of first diodes having the same number as the plurality of IGBT modules, wherein the cathode of each of the first diodes is connected to a corresponding IGBT module;

[0011] a plurality of first resistors, the number of which is the same as the number of the plurality of IGBT modules, wherein the resistance values ​​of the first resistors are different, and one end of each of the first resistors is correspondingly connected to the positive electrode of one of the first diodes;

[0012] The second resistor is connected to the other end of each of the first resistors respectively, and the output end of the voltage divider circuit module is formed on a side where the second resistor is connected to each of the first resistors.

[0013] Furthermore, the voltage divider circuit module further includes:

[0014] A plurality of first capacitors having the same number as the plurality of IGBT modules, one end of each of the first capacitors correspondingly connected to the anode of one of the first diodes, and the other end connected to the ground.

[0015] Furthermore, the voltage divider circuit module further includes:

[0016] A plurality of second capacitors are connected in parallel, one end of the second capacitors is connected to the output end of the voltage divider circuit module, and the other end is grounded.

[0017] Furthermore, the IGBT fault feedback signal circuit further includes:

[0018] an integration circuit module, connected to the voltage-dividing circuit module, receiving the normal voltage-dividing signal or the fault voltage-dividing signal output by the voltage-dividing circuit module, and generating an integration output signal with an increasing slope or a decreasing slope;

[0019] A comparison circuit module is connected to the integration circuit module, receives the integration output signal output by the integration circuit module, generates a frequency signal that is positively correlated with the normal voltage division signal or the fault voltage division signal, and controls the switching of the slope of the integration output signal output by the integration circuit module to increase and decrease.

[0020] Furthermore, the integration circuit module specifically includes:

[0021] A first comparator, a third capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an electronic switch tube;

[0022] in,

[0023] One end of the third capacitor is connected to the negative input end of the first comparator, and the other end is connected to the output end of the first comparator;

[0024] One end of the third resistor is connected to the output end of the voltage divider circuit module, and the other end is connected to one end of the fourth resistor;

[0025] The other end of the fourth resistor is connected to the negative input terminal of the first comparator;

[0026] One end of the fifth resistor is connected to the output end of the voltage divider circuit module, and the other end is connected to the positive input end of the first comparator;

[0027] One end of the sixth resistor is connected to the positive input terminal of the first comparator, and the other end is connected to the ground;

[0028] The input end of the electronic switch tube is connected to one end of the fourth resistor, the output end of the electronic switch tube is grounded, and the control end of the electronic switch tube is used to receive the control signal output by the comparison circuit module.

[0029] Further, each resistance value of the fifth resistor and the sixth resistor is greater than the resistance value of the second resistor.

[0030] Furthermore, the comparison circuit module specifically includes:

[0031] a second comparator, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;

[0032] in,

[0033] The negative input terminal of the second comparator is connected to the output terminal of the first comparator;

[0034] One end of the seventh resistor is connected to the positive input end of the second comparator, and the other end is connected to the output end of the second comparator;

[0035] One end of the eighth resistor is connected to the positive input terminal of the second comparator, and the other end is connected to the ground;

[0036] One end of the ninth resistor is connected to the positive input end of the second comparator, and the other end is connected to the control end of the electronic switch tube;

[0037] One end of the tenth resistor is connected to one end of the ninth resistor, and the other end is connected to the output end of the electronic switch tube.

[0038] Furthermore, the IGBT fault feedback signal circuit further includes:

[0039] The clamping circuit module is used to be connected to the output end of the comparison circuit module.

[0040] Furthermore, the clamping circuit module includes:

[0041] an eleventh resistor, a second diode and a third diode;

[0042] in,

[0043] One end of the eleventh resistor is connected to the output end of the comparison circuit module;

[0044] The anode of the second diode is connected to the other end of the eleventh resistor, and the cathode is used to connect to the clamping power supply;

[0045] The cathode of the third diode is connected to the other end of the eleventh resistor, and the anode is grounded.

[0046] Furthermore, the IGBT fault feedback signal circuit further includes:

[0047] The control module is used to receive the frequency signal through the clamping circuit module, analyze whether each of the IGBT modules is normal based on the frequency signal based on a preset frequency range, and when it is analyzed that an IGBT module fails, analyze the fault frequency signal to determine the IGBT module that has failed.

[0048] Second,

[0049] The present application provides a frequency converter, comprising: an IGBT fault feedback signal circuit as described in any one of the above items.

[0050] Thirdly,

[0051] The present application provides a frequency conversion control device, including: the frequency converter as described above.

[0052] This application adopts the above technical solution, which has at least the following beneficial effects:

[0053] The voltage divider circuit module of the present application can achieve that when each IGBT module is working normally, the voltage divider circuit module outputs a normal voltage divider signal through an output end, and when one or more IGBT modules fail, the voltage divider circuit module outputs a fault voltage divider signal representing the failed IGBT module through the output end. The fault voltage divider signal can clearly identify the source of the IGBT module failure, and when multiple IGBT modules fail, the fault signals of different IGBT modules are combined to form a fault voltage divider signal, which is output through the output end, which helps to improve the interface utilization and maintenance efficiency of the main control chip.

[0054] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be 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 paying creative work.

[0056] Figure 1 is a structural schematic diagram of an IGBT fault feedback signal circuit according to an exemplary embodiment;

[0057] Figure 2 is a structural schematic diagram of an IGBT fault feedback signal circuit according to another exemplary embodiment;

[0058] Figure 3 is a flow chart of IGBT fault feedback frequency signal processing according to an exemplary embodiment;

[0059] Figure 4 is a block diagram schematic diagram of a frequency converter according to an exemplary embodiment;

[0060] Figure 5 It is a block diagram schematic diagram of a frequency conversion control device according to an exemplary embodiment. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application.

[0062] See also Figure 1 , Figure 1 is a schematic structural diagram of an IGBT fault feedback signal circuit according to an exemplary embodiment. Figure 1 As shown, the IGBT fault feedback signal circuit 1 includes:

[0063] A plurality of IGBT modules 10;

[0064] The voltage divider circuit module 11 is connected to the plurality of IGBT modules 10, wherein when each of the IGBT modules 10 operates normally, the voltage divider circuit module 11 outputs a normal voltage divider signal through an output end, and when one or more of the IGBT modules 10 fails, the voltage divider circuit module 11 outputs a fault voltage divider signal representing the faulty IGBT module 10 through the output end.

[0065] The voltage divider circuit module 11 of the present application can realize that when each IGBT module 10 is working normally, the voltage divider circuit module 11 can output a normal voltage divider signal through an output end, and when one or more IGBT modules 10 fail, the voltage divider circuit module 11 outputs a fault voltage divider signal representing the failed IGBT module 10 through the output end. The fault voltage divider signal can clearly identify the source of the IGBT module 10 failure, and when multiple IGBT modules 10 fail, the fault signals of different IGBT modules 10 are combined to form a fault voltage divider signal, which is output through the output end, which helps to improve the interface utilization and maintenance efficiency of the main control chip.

[0066] The voltage divider circuit module 11 of the present application is described below through a specific embodiment.

[0067] See also Figure 1 In one embodiment, the voltage divider circuit module 11 includes:

[0068] A plurality of first diodes (D11, D12, D13...) having the same number as the plurality of IGBT modules 10 (IGBT1, IGBT2, IGBT3...), wherein the cathode of each first diode is connected to a corresponding IGBT module 10;

[0069] a plurality of first resistors (R11, R12, R13...) having the same number as the plurality of IGBT modules 10 (IGBT1, IGBT2, IGBT3...), wherein each of the first resistors has a different resistance value, and one end of each of the first resistors is correspondingly connected to the positive electrode of one of the first diodes;

[0070] The second resistor R10 is connected to the other end of each of the first resistors respectively, and the output end of the voltage divider circuit module 11 is formed on one side where the second resistor R10 is connected to each of the first resistors.

[0071] Specifically, the above embodiment utilizes a second resistor R10, multiple first resistors (R11, R12, R13...) and multiple first diodes (D11, D12, D13...) to output a normal voltage division signal when each IGBT module 10 is operating normally, and when one or more IGBT modules 10 fail, output a fault voltage division signal representing the faulty IGBT module 10. Figure 1 In the embodiment, U1 provides a power supply voltage, and by utilizing the single-phase conduction characteristic of the diode, when each IGBT module 10 works normally, each IGBT module 10 outputs a high level, each first diode does not conduct and remains turned off, and a normal voltage division signal is output through the second resistor R10.

[0072] When an IGBT module 10 fails, the faulty IGBT module 10 forms a low level, and its corresponding first diode is turned on. Correspondingly, the corresponding first resistor participates in voltage division to form a fault voltage division signal. Assuming that IGBT1 fails, at this time, the resistance values ​​of R3 and R4 are much greater than the resistance values ​​of R10, R11, R12, etc., and the overall current flow direction can be regarded as U1-R10-R11-D11-ground. R10 and R11 form a resistance voltage division and output a fault voltage division signal. In this application, the resistance values ​​of each first resistor (R11, R12, R13...) are different, so that when different IGBT modules 10 fail, the fault voltage division signals formed are different. Reasonable allocation of the resistance ratios of R10 and R11, R12, R13, etc. can achieve one or more groups of module fault identification. When multiple IGBT modules 10 fail, the fault signals of different faulty IGBT modules 10 can be merged to form a fault voltage division signal, which can distinguish which IGBT modules 10 have failed.

[0073] See also Figure 1 In one embodiment, the voltage divider circuit module 11 further includes:

[0074] A plurality of first capacitors (C11, C12, C13, ...) having the same number as the plurality of IGBT modules 10, one end of each of the first capacitors correspondingly connected to the anode of one of the first diodes, and the other end connected to the ground.

[0075] Specifically, by setting each first capacitor (C11, C12, C13...) corresponding to each first diode (D11, D12, D13...), the first capacitor can absorb the current impact when the corresponding first diode is turned on or off, so as to achieve rapid protection processing and improve the safety of the circuit.

[0076] See also Figure 1 In one embodiment, the voltage divider circuit module 11 further includes:

[0077] A plurality of second capacitors (C21, C22, ...) are connected in parallel, one end of the second capacitors is connected to the output end of the voltage divider circuit module 11, and the other end is grounded.

[0078] Specifically, the plurality of second capacitors (C21, C22, . . .) are used to achieve voltage stabilization and filtering of the output of the voltage divider circuit module 11, thereby improving the safety of the circuit.

[0079] In practical applications, by analyzing the voltage division signal output by the voltage division circuit module 11, the source of the fault of the IGBT module 10 can be clearly identified when the IGBT module 10 fails. However, the amplitudes of various voltage division signals are large, and the resistance errors are also large. In this regard, the present application further provides the following related solutions.

[0080] See also Figure 2 , Figure 2 is a schematic structural diagram of an IGBT fault feedback signal circuit according to another exemplary embodiment. Figure 2 As shown, the IGBT fault feedback signal circuit 1 also includes:

[0081] an integration circuit module 12, connected to the voltage-dividing circuit module 11, receiving the normal voltage-dividing signal or the fault voltage-dividing signal output by the voltage-dividing circuit module 11, and generating an integration output signal with an increasing slope or a decreasing slope;

[0082] The comparison circuit module 13 is connected to the integration circuit module 12, receives the integration output signal output by the integration circuit module 12, generates a frequency signal that is positively correlated with the normal voltage division signal or the fault voltage division signal, and controls the switching of the slope of the integration output signal output by the integration circuit module 12 to increase and decrease.

[0083] After the voltage divider circuit module 11 generates different voltage divider signals according to whether each IGBT module 10 is normal or fails, the integration circuit module 12 and the comparison circuit module 13 cooperate with each other to realize that the integration circuit module 12 converts the normal voltage divider signal or the fault voltage divider signal into an integral output signal with a rising slope or a falling slope, and then the comparison circuit converts it into a frequency signal that is positively correlated with the normal voltage divider signal or the fault voltage divider signal for output.

[0084] See also Figure 2 In one embodiment, the integration circuit module 12 specifically includes:

[0085] A first comparator L1, a third capacitor C3, a third resistor R1, a fourth resistor R2, a fifth resistor R3, a sixth resistor R4 and an electronic switch tube G1,

[0086] in,

[0087] One end of the third capacitor C3 is connected to the negative input end of the first comparator L1, and the other end is connected to the output end of the first comparator L1;

[0088] One end of the third resistor R1 is connected to the one output end of the voltage divider circuit module 11, and the other end is connected to one end of the fourth resistor R2;

[0089] The other end of the fourth resistor R2 is connected to the negative input end of the first comparator L1;

[0090] One end of the fifth resistor R3 is connected to the one output end of the voltage divider circuit module 11, and the other end is connected to the positive input end of the first comparator L1;

[0091] One end of the sixth resistor R4 is connected to the positive input end of the first comparator L1, and the other end is grounded;

[0092] The input end of the electronic switch tube G1 is connected to one end of the fourth resistor R2 , the output end of the electronic switch tube G1 is grounded, and the control end of the electronic switch tube G1 is used to receive the control signal output by the comparison circuit module 13 .

[0093] Specifically, different models of the third capacitor C3, the third resistor R1 and the fourth resistor R2 can change the slope of the output of the integration circuit module 12, and the third resistor R1 and the fourth resistor R2 can also control the duty cycle of the output pulse. Different models of the fifth resistor R3 and the sixth resistor R4 can change the size of the output of the integration circuit module 12. The electronic switch tube G1 receives the control signal output by the comparison circuit module 13 to control the switching of the slope of the integration output signal output by the integration circuit module 12 to rise and fall.

[0094] Furthermore, the resistance of each of the fifth resistor R3 and the sixth resistor R4 is greater than the resistance of the second resistor R10.

[0095] In the above embodiment, the influence on the voltage divider circuit can be reduced. Specifically, in practical applications, the fifth resistor R3 and the sixth resistor R4 can be selected to be much larger than the second resistor R10.

[0096] See also Figure 2 In one embodiment, the comparison circuit module 13 specifically includes:

[0097] a second comparator L2, a seventh resistor R5, an eighth resistor R6, a ninth resistor R7 and a tenth resistor R8,

[0098] in,

[0099] The negative input terminal of the second comparator L2 is connected to the output terminal of the first comparator L1;

[0100] One end of the seventh resistor R5 is connected to the positive input end of the second comparator L2, and the other end is connected to the output end of the second comparator L2;

[0101] One end of the eighth resistor R6 is connected to the positive input end of the second comparator L2, and the other end is grounded;

[0102] One end of the ninth resistor R7 is connected to the positive input end of the second comparator L2, and the other end is connected to the control end of the electronic switch tube G1;

[0103] One end of the tenth resistor R8 is connected to one end of the ninth resistor R7 , and the other end is connected to the output end of the electronic switch tube G1 .

[0104] Specifically, different models of the seventh resistor R5 and the eighth resistor R6 can control the output rise and fall limits of the integration circuit module 12, thereby adjusting the corresponding frequency F size in the absence of a fault, and can set the program protection values ​​T1 and T2 for subsequent programs and set the corresponding counting interval. Through the setting of the ninth resistor R7 and the tenth resistor R8, the comparison circuit module 13 outputs a control signal to the electronic switch tube G1 of the integration circuit module 12 to control the on and off of the electronic switch tube G1.

[0105] The implementation of the above-mentioned related embodiments is described in detail below.

[0106] When the system operates normally, each IGBT signal is at a high level, each first diode (D11, D12, D13...) remains turned off due to the single-phase conduction characteristic, and the voltage divider circuit module 11 outputs a normal voltage divider signal:

[0107]

[0108] The third capacitor C3 of the integration circuit module 12 is charged, and the current flows to Lin-R1-R2-C3, where Lin is the input current of the integration circuit module 12;

[0109]

[0110]

[0111] From the above two formulas we can get:

[0112]

[0113] Wherein, Uout1 is the output of the first comparator L1, and t is time.

[0114] When calculating, R3:R4 uses 2:1, then the calculation result

[0115]

[0116] If R1, R2 and C3 are fixed, the falling slope of Uout1 is proportional to Ka*Uin, where Ka is a fixed coefficient;

[0117] The voltage of L2 output Uout2 of comparison circuit module 13 returns to When Uout1 drops below U(L2+), Uout2 outputs a fixed positive voltage Uout2+, G1 is turned on, the integral capacitor C3 is discharged, and the main control chip receives a high-level signal.

[0118] The capacitor C3 of the integrating circuit is discharged, and the discharge loop is Ic1-C3-R2-G1-ground.

[0119]

[0120]

[0121] When calculating, R3:R4 uses 2:1, then the calculation result

[0122]

[0123] If R1, R2 and C3 are fixed, the rising slope of Uout1 is proportional to Kb*Uin, and Kb is a fixed coefficient;

[0124] The comparison circuit L2 outputs the voltage Uout2 back to When Uout1 rises higher than U(L2+), Uout2 outputs a fixed negative voltage Uout2-, G1 is closed, the integral capacitor C3 is charged, and the main control chip receives a low level signal.

[0125] In this way, the output signal of Uout1 changes to a triangle wave. The overall waveform of Uout1 cycles in a triangular wave pattern between Kp*Uout2+ and Kp*Uout2-.

[0126] The slope is proportional to the input K*Uin, that is, the output period Tout is proportional to K*Uin, K is a positive value, and K is the above-mentioned Ka or Kb. If Uin is fixed, the frequency F1 of the system is fixed under normal circumstances, the system detection count is within a fixed range, and the system output is normal without fault.

[0127] When the system fails to operate, it corresponds to a fault in one or several groups of IGBT modules 10. The corresponding diode of the fault voltage-dividing circuit of the IGBT module 10 is turned on. The corresponding circuit voltage-dividing causes different and unique Uinn (Uinn is the fault voltage-dividing signal) to correspond to different situations. Then, it passes through the integration and comparison circuit and is input to the main control chip. Since Uinn≠Uin, its Toutnn≠Tout (Tout is the normal output pulse period, Toutnn is the fault pulse output period).

[0128] See also Figure 2 In one embodiment, the IGBT fault feedback signal circuit 1 further includes:

[0129] The clamping circuit module 14 is used to be connected to the output end of the comparison circuit module 13 .

[0130] Specifically, the stability and reliability of the frequency signal is ensured by a clamping circuit.

[0131] See also Figure 2 In one embodiment, the clamping circuit module 14 includes:

[0132] an eleventh resistor R9, a second diode D2 and a third diode D3;

[0133] in,

[0134] One end of the eleventh resistor R9 is connected to the output end of the comparison circuit module 13;

[0135] The anode of the second diode D2 is connected to the other end of the eleventh resistor R9, and the cathode is used to connect to the clamping power supply;

[0136] The cathode of the third diode D3 is connected to the other end of the eleventh resistor R9, and the anode is grounded.

[0137] Specifically, clamping is achieved by the second diode D2 and the third diode D3.

[0138] See also Figure 2 In one embodiment, the IGBT fault feedback signal circuit 1 further includes:

[0139] The control module 15 is used to receive the frequency signal through the clamping circuit module 14, analyze whether each of the IGBT modules 10 is normal based on the preset frequency range through the frequency signal, and when it is analyzed that the IGBT module 10 is faulty, analyze the fault frequency signal to determine the IGBT module 10 that has failed.

[0140] For details, please refer to Figure 3 , Figure 3It is a flowchart of IGBT fault feedback frequency signal processing according to an exemplary embodiment. The frequency signal is displayed by high and low levels. Under normal system conditions, the frequency is fixed. The system detection count is within the fixed range Room1 or Room2. The system output is normal and has no faults. The system is operating with a fault, corresponding to one or several groups of IGBT modules 10 faults. The corresponding diode of the IGBT module 10 fault voltage divider circuit is turned on, and the corresponding circuit voltage divider leads to different and unique Uinn corresponding to different situations. Then, it is input to the main control chip through the integration and comparison circuit. Since Uinn≠Uin, its Toutnn≠Tout (Tout normal output pulse cycle, Toutnn fault pulse output cycle). When the system detection counter exceeds the set interval, it is directly determined that the system IGBT module 10 is faulty and corresponding emergency processing is performed to protect the circuit. At the same time, the fault frequency signal is analyzed, thereby locking the faulty IGBT module 10.

[0141] See also Figure 4 , Figure 4 is a block diagram of a frequency converter according to an exemplary embodiment. Figure 4 As shown, the frequency converter 4 includes:

[0142] An IGBT fault feedback signal circuit 1 as described in any one of the above items.

[0143] Regarding the frequency converter 4 of the present application, the IGBT fault feedback signal circuit 1 has been described in detail in the relevant embodiments, and will not be elaborated here. The frequency converter 4 of the present application can be a photovoltaic frequency converter 4, a common frequency converter 4, etc., which contains multiple groups of IGBT modules 10, so as to realize the conversion of multiple IGBT module 10 faults into frequency signals for transmission, and quickly respond to module faults while clarifying the location of the faulty module. That is, the fault protection response is guaranteed, and the fault inspection and repair efficiency of the IGBT module 10 is greatly improved.

[0144] See also Figure 5 , Figure 5 is a block diagram of a frequency conversion control device according to an exemplary embodiment. Figure 5 As shown, the frequency conversion control device 5 includes: the frequency converter 4 as described above.

[0145] Regarding the frequency conversion control device 5 of the present application, the IGBT fault feedback signal circuit 1 has been described in detail in the relevant embodiments, and will not be elaborated here.

[0146] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0147] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" and "multiple" refers to at least two.

[0148] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. In addition, the "connection" used here may include wireless connection; the wording "and / or" used includes any unit and all combinations of one or more associated listed items.

[0149] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0150] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0151] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0152] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0153] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0154] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0155] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An IGBT fault feedback signal circuit, characterized in that: include: Multiple IGBT modules; A voltage-dividing circuit module is connected to the plurality of IGBT modules, wherein when each of the IGBT modules works normally, the voltage-dividing circuit module outputs a normal voltage-dividing signal through an output terminal, and when one or more of the IGBT modules fails, the voltage-dividing circuit module outputs a fault voltage-dividing signal indicating the faulty IGBT module through the output terminal; Wherein, the voltage divider circuit module comprises: A plurality of first diodes having the same number as the plurality of IGBT modules, wherein the cathode of each of the first diodes is connected to a corresponding IGBT module; a plurality of first resistors, the number of which is the same as the number of the plurality of IGBT modules, wherein the resistance values ​​of the first resistors are different, and one end of each of the first resistors is correspondingly connected to the positive electrode of one of the first diodes; a second resistor, connected to the other end of each of the first resistors respectively, and forming the output end of the voltage divider circuit module on a side where the second resistor is connected to each of the first resistors; Also includes: an integration circuit module, connected to the voltage-dividing circuit module, receiving the normal voltage-dividing signal or the fault voltage-dividing signal output by the voltage-dividing circuit module, and generating an integration output signal with an increasing slope or a decreasing slope; A comparison circuit module is connected to the integration circuit module, receives the integration output signal output by the integration circuit module, generates a frequency signal that is positively correlated with the normal voltage division signal or the fault voltage division signal, and controls the switching of the slope of the integration output signal output by the integration circuit module to increase and decrease.

2. The IGBT fault feedback signal circuit according to claim 1, characterized in that: The voltage divider circuit module also includes: A plurality of first capacitors having the same number as the plurality of IGBT modules, one end of each of the first capacitors correspondingly connected to the anode of one of the first diodes, and the other end connected to the ground.

3. The IGBT fault feedback signal circuit according to claim 1, characterized in that: The voltage divider circuit module also includes: A plurality of second capacitors are connected in parallel, one end of the second capacitors is connected to the output end of the voltage divider circuit module, and the other end is grounded.

4. The IGBT fault feedback signal circuit according to claim 1, characterized in that: The integration circuit module specifically includes: A first comparator, a third capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an electronic switch tube; in, One end of the third capacitor is connected to the negative input end of the first comparator, and the other end is connected to the output end of the first comparator; One end of the third resistor is connected to the output end of the voltage divider circuit module, and the other end is connected to one end of the fourth resistor; The other end of the fourth resistor is connected to the negative input terminal of the first comparator; One end of the fifth resistor is connected to the output end of the voltage divider circuit module, and the other end is connected to the positive input end of the first comparator; One end of the sixth resistor is connected to the positive input terminal of the first comparator, and the other end is connected to the ground; The input end of the electronic switch tube is connected to one end of the fourth resistor, the output end of the electronic switch tube is grounded, and the control end of the electronic switch tube is used to receive the control signal output by the comparison circuit module.

5. The IGBT fault feedback signal circuit according to claim 4, characterized in that: The resistance values ​​of the fifth resistor and the sixth resistor are both greater than the resistance value of the second resistor.

6. The IGBT fault feedback signal circuit according to claim 4, characterized in that: The comparison circuit module specifically includes: a second comparator, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; in, The negative input terminal of the second comparator is connected to the output terminal of the first comparator; One end of the seventh resistor is connected to the positive input end of the second comparator, and the other end is connected to the output end of the second comparator; One end of the eighth resistor is connected to the positive input terminal of the second comparator, and the other end is connected to the ground; One end of the ninth resistor is connected to the positive input end of the second comparator, and the other end is connected to the control end of the electronic switch tube; One end of the tenth resistor is connected to one end of the ninth resistor, and the other end is connected to the output end of the electronic switch tube.

7. The IGBT fault feedback signal circuit according to claim 1, characterized in that: The IGBT fault feedback signal circuit further includes: The clamping circuit module is used to be connected to the output end of the comparison circuit module.

8. The IGBT fault feedback signal circuit according to claim 7, characterized in that: The clamping circuit module comprises: an eleventh resistor, a second diode and a third diode; in, One end of the eleventh resistor is connected to the output end of the comparison circuit module; The anode of the second diode is connected to the other end of the eleventh resistor, and the cathode is used to connect to the clamping power supply; The cathode of the third diode is connected to the other end of the eleventh resistor, and the anode is grounded.

9. The IGBT fault feedback signal circuit according to claim 7, characterized in that: The IGBT fault feedback signal circuit further includes: The control module is used to receive the frequency signal through the clamping circuit module, analyze whether each of the IGBT modules is normal based on the frequency signal based on a preset frequency range, and when it is analyzed that an IGBT module fails, analyze the fault frequency signal to determine the IGBT module that has failed.

10. A frequency converter, characterized in that: include: An IGBT fault feedback signal circuit as described in any one of claims 1 to 9.

11. A frequency conversion control device, characterized in that: include: The frequency converter as claimed in claim 10.

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