A drive fault feedback method and feedback system

Abstract

The application provides a driving fault feedback method and a feedback system. The method first determines frequency segments corresponding to different fault types; then feedbacks a detected fault level signal for logical processing; evaluates fault priority, changes the fault level signal to a low level according to the priority, changes the low level to a high level after a plurality of counting points, takes the high level as an initial value, and continuously outputs frequency signals corresponding to different fault types; finally collects the frequency signals, counts values between two rising edges, and determines a fault type according to the obtained counting values and the fault type frequency segments. The method uses a single channel to feedback fault information, transfers fault information according to feedback pulse frequency, and different frequency bands represent different faults, so that different fault types can be distinguished. By setting a wide fault frequency band and a frequency interval zone, the influence of interference can be greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of semiconductor device fault driving technology, specifically relating to a fault feedback method and feedback system. Background Technology

[0002] With the maturity of power semiconductor technology, the application of high-power semiconductor devices (IGBT, SiC MOSFET) is becoming increasingly widespread, and the power rating of converters is also increasing. Meanwhile, to ensure the safe and reliable operation of converters, fault detection, handling, and feedback are crucial. Existing drive fault feedback methods mainly include multi-channel feedback drive faults and single-channel pulse width feedback. However, in the long-term application of converters, it has been found that multi-channel feedback drive fault methods suffer from high costs, difficulty in distinguishing startup fault types, and interference-induced false triggering, while single-channel pulse width feedback drive fault methods suffer from pulse width loss and insufficient interference immunity.

[0003] Multi-channel level feedback for drive faults: This solution uses separate channels for different faults, such as short-circuit faults and drive undervoltage faults. Figure 1 As shown. The implementation method is as follows: When a fault is detected, different faults are fed back through independent channels (signal transmission channel 1 is the undervoltage fault level signal, signal transmission channel 2 is the short circuit fault signal). The signal conversion module is used to convert the signals required by the transmission channel signals and the signals required by the logic processing circuit. The medium of the fault feedback signal transmission channel can be an optical signal or an electrical signal. The high or low transmission level represents the fault information. When the control circuit receives the relevant fault signal, it performs the corresponding internal logic processing.

[0004] Multi-channel feedback driven fault waveforms, such as Figure 2 As shown, during normal operation, the feedback fault signal terminal outputs a high level. When a fault occurs in the feedback cable, the feedback fault signal will remain at a low level. When the fault detection circuit detects a fault, either a short circuit fault or an undervoltage fault will change its respective feedback fault channel from a normal high level to a low level, depending on its condition.

[0005] Single-channel pulse width feedback fault: This solution uses single-channel feedback, where different pulse widths of the feedback signal represent different faults, such as... Figure 3 As shown. The implementation method is as follows: When the fault detection circuit detects a fault (short circuit, undervoltage, etc.), the logic processing circuit 1 inside the drive circuit first performs logic processing, and then outputs square waves with different pulse widths for fault feedback. The signal conversion module in the drive circuit is used to convert the signals required for the transmission channel. The medium for the fault signal transmission channel can be an optical signal or an electrical signal, and the pulse width W of the transmitted signal is... fdRepresenting different fault information, when the relevant part of the control circuit receives a fault signal, the signal conversion module is used to convert the signal required by the logic processing circuit 2. The logic processing circuit 2 first performs pulse width W on the received pulse signal. fd The system determines the fault condition based on the information represented by different pulse widths and feeds the fault condition back to the control circuit. The control circuit then performs protection processing such as blocking control pulses.

[0006] The normal waveform for single-channel pulse width feedback is as follows: Figure 4 As shown, during normal operation, when the input signal is turned off, after a delay, the fault feedback port will output a pulse width of W. fd1 A single pulse.

[0007] A schematic diagram of a single-channel pulse width feedback fault waveform is shown below. Figure 5 As shown, when a feedback channel cable fault occurs, the fault feedback port will continuously output a low level. When the fault detection circuit detects a fault, if a short circuit fault is detected, the fault feedback port will output a pulse width of W. fd2 If an undervoltage fault is detected, the fault feedback port will output a pulse width of W when the low level is detected. fd3 The low level, and after the response delay time, the input signal V of the power device ge closure.

[0008] The disadvantage of multi-channel feedback-driven faults is:

[0009] (1) High cost. Since short circuit faults and drive undervoltage faults are fed back through separate channels, the cost of the feedback channel devices increases by nearly double.

[0010] (2) When using the multi-channel drive fault feedback method, if a fault occurs when the drive circuit starts, it is difficult to distinguish whether it is a feedback cable fault, undervoltage, or short circuit fault.

[0011] (3) The single-channel pulse width feedback fault uses level triggering, and a low level is considered a fault. Therefore, when there is interference, it is easy to generate false triggering. If the anti-interference capability of the system is increased, a high-reliability filter needs to be equipped, but at the same time, the feedback delay time is also increased.

[0012] The disadvantages of single-channel pulse width feedback faults are:

[0013] (1) This method has turn-on delay and turn-off delay in hardware devices. If the difference between the two is large, it will cause a large pulse loss, which will lead to inaccurate pulse width at the acquisition end. Therefore, this places higher demands on the difference between the turn-on delay and turn-off delay of the devices in the feedback path.

[0014] (2) This method has poor anti-interference capability. Since the feedback pulse of the channel only occurs when it is turned off or when there is a fault, and it is only a single pulse, when a fault occurs, if the single pulse is interfered with, it is easy to cause the control system to not respond in time. To solve this interference, a filter needs to be added or software processing is required. However, software processing will greatly increase the complexity of the upper control system and is not suitable for convenient application by users. Summary of the Invention

[0015] To address the technical problems of high cost, difficulty in distinguishing fault types, and interference-induced false triggering in multi-channel feedback drive faults, as well as pulse width loss and poor anti-interference capability in single-channel pulse width feedback faults, this invention provides a frequency-based drive fault feedback method and system. It employs a single channel for fault information feedback, transmitting fault information based on the feedback pulse frequency. Different frequency bands represent different faults, allowing for the differentiation of different fault types. Furthermore, it eliminates the pulse width loss problem inherent in single-channel pulse width feedback. By setting a wider fault frequency band and frequency interval, the impact of interference can be significantly reduced.

[0016] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0017] This invention provides a method for driving fault feedback, comprising the following steps:

[0018] Determine the frequency segments corresponding to different fault types;

[0019] The detected fault level signal is fed back for logical processing;

[0020] The fault priority is assessed, and the fault level signal is changed to low level according to the priority. After a certain number of counting points, the low level is changed to high level. The high level is used as the initial value to continuously output the frequency signal corresponding to different fault types.

[0021] Collect frequency signals, count the value between two rising edges, and determine the fault type based on the obtained count value and the fault type frequency segment.

[0022] Furthermore, the frequency segments corresponding to different fault types are determined, and the frequency segments sequentially include the fiber fault frequency region, the low-frequency discard region, the normal operating frequency region, the first frequency interval, the undervoltage fault frequency region, the second frequency interval, the short-circuit fault frequency region, and the high-frequency discard region.

[0023] Furthermore, the fiber optic fault frequency region is 0Hz, and the low-frequency discard region is 0Hz to f. N1 The normal operating frequency range is f N1 ~f N2 The first frequency interval is f N2 ~f U1The undervoltage fault is f U1 ~f U2 The second frequency interval is f U1 ~f S1 The short-circuit fault is f S1 ~f S2 The high-frequency discard region is f S2 ~+∞Hz.

[0024] Furthermore, (f N1 +f N2 The value of f / 2 ranges from 100kHz to 200kHz. N1 =90% (f N1 +f N2 ) / 2, f N2 =110%(f) N1 +f N2 ) / 2;(f U1 +f U2 The value of f / 2 ranges from 400kHz to 600kHz. U1 =90% (f U1 +f U2 ) / 2, f U2 =110%(f) U1 +f U2 ) / 2;(f S1 +f S2 The value of f / 2 ranges from 800kHz to 1.2MHz. S1 =80% (f S1 +f S2 ) / 2, f S2 =120%(f) S1 +f S2 ) / 2.

[0025] Furthermore, the fault priority is that the response to a short-circuit fault is greater than that to an undervoltage fault.

[0026] Furthermore, the method for outputting frequency signals corresponding to different fault types is as follows:

[0027] First, a short-circuit fault is detected. If a short-circuit fault is detected, the short-circuit fault information is latched, and the output fault square wave is changed to a low level. After several counting points, the output fault signal is set high, and the output frequency is continuously set to (f) with the high level as the initial value. S1 +f S2 ) / 2, a square wave with a duty cycle of 50%;

[0028] Then, it checks if there is an undervoltage fault. If there is, it latches the undervoltage fault information, changes the output fault square wave to a low level, and after several counting points, sets the output fault signal high, with the high level as the initial continuous output frequency of (f U1 +f U2 ) / 2, a square wave with a duty cycle of 50%;

[0029] If no fault signal is detected, it is operating normally, and the continuous output frequency is (f N1 +f N2 A square wave with a duty cycle of 50% (2 / 2).

[0030] The present invention also provides a drive fault feedback system, including a drive circuit and a control circuit;

[0031] The driving circuit includes

[0032] Fault detection circuit, used to detect fault signals;

[0033] The first logic processing circuit is used to determine the fault priority, change the fault signal of the drive circuit to low level according to the priority, and change the low level to high level after several counting points. Using this high level as the initial value, it continuously outputs the frequency signal corresponding to different fault types.

[0034] A signal conversion module is used to convert the output signal in the first logic processing circuit into the signal required in the transmission medium.

[0035] The control circuit includes

[0036] A signal conversion module is used to convert signals in the transmission medium into signals required by the second logic circuit.

[0037] The second logic processing circuit is used to process the fault signals of the drive circuit, count the count value between two rising edges, calculate the frequency of the feedback pulse, and determine the fault type according to the frequency segmentation of the fault type.

[0038] Furthermore, the transmission medium is a shielded metal wire or an optical fiber; the first and second logic processing circuits are digital logic processors (FPGAs) equipped with a 200MHz crystal oscillator.

[0039] The beneficial effects of this invention compared to the prior art are as follows:

[0040] The present invention provides a driving fault feedback method and feedback system, which uses a single channel for fault information feedback, which can significantly reduce the cost of devices. At the same time, the fault information is transmitted according to the feedback pulse frequency, and different frequency bands represent different faults, which can clearly distinguish different fault types. Moreover, there is no pulse width loss problem in single-channel pulse width feedback. By setting a wider fault frequency band and frequency interval, the impact of interference can be greatly reduced. Attached Figure Description

[0041] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0042] Figure 1 A block diagram for multi-channel feedback fault drive;

[0043] Figure 2 This is a schematic diagram of a fault waveform driven by multi-channel feedback.

[0044] Figure 3 A block diagram of a single-channel pulse width feedback fault.

[0045] Figure 4 This is a schematic diagram of a normal waveform for single-channel pulse width feedback.

[0046] Figure 5 This is a schematic diagram of a single-channel pulse width feedback fault waveform.

[0047] Figure 6 A block diagram of a frequency-based drive fault feedback system provided for a specific embodiment of the present invention;

[0048] Figure 7 A schematic diagram showing the correspondence between single-channel pulse width feedback frequency bands and fault types provided for a specific embodiment of the present invention;

[0049] Figure 8 A flowchart of the signal processing of the first logic processing circuit provided in a specific embodiment of the present invention;

[0050] Figure 9 A flowchart of the signal processing of the second logic processing circuit provided in a specific embodiment of the present invention;

[0051] Figure 10 This is a schematic diagram of the normal waveform of the drive fault feedback method provided in a specific embodiment of the present invention;

[0052] Figure 11This is a schematic diagram of the fault waveform of the drive fault feedback method provided in a specific embodiment of the present invention;

[0053] Figure 12 This is a schematic diagram of the desaturation detection circuit;

[0054] Figure 13 This is a schematic diagram of an undervoltage protection circuit. Detailed Implementation

[0055] Specific embodiments of the present invention will now be described in detail. In the following description, specific details are set forth for purposes of explanation and not limitation, in order to aid in a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced in other embodiments departing from these specific details.

[0056] It should be noted that, in order to avoid obscuring the invention with unnecessary details, only the device structure and / or processing steps closely related to the solution of the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0057] This invention provides a method for driving fault feedback, comprising the following steps:

[0058] Determine the frequency segments corresponding to different fault types;

[0059] The detected fault level signal is fed back for logical processing;

[0060] The fault priority is assessed, and the fault level signal is changed to low level according to the priority. After passing through a number of counting points (corresponding to a time of 200ns) by the logic processing circuit, the low level is changed to high level. The high level is used as the initial value to continuously output the frequency signal corresponding to different fault types.

[0061] Collect frequency signals, count the values ​​between two rising edges, and determine the fault condition based on the obtained count values ​​and the fault type frequency segmentation table.

[0062] This invention provides a drive fault feedback system, such as Figure 6As shown, the circuit includes a drive circuit and a control circuit. The drive circuit includes a fault detection circuit, a first logic processing circuit, and a signal conversion module. The fault detection circuit detects fault conditions, and the first logic processing circuit processes fault logic information. If the circuit is operating normally, it continuously outputs a signal corresponding to the frequency under normal operating conditions. If a fault signal is detected, the fault priority is first evaluated (set as needed, e.g., a short-circuit fault response is greater than an undervoltage fault), then the fault information is latched, and then the drive circuit fault signal is changed to a low level according to priority. After several counting points (corresponding to a time of 200ns), the low level is changed to a high level, and this high level is used as the initial to continuously output frequency signals corresponding to different fault types. The signal conversion module mainly converts the output signal in the first logic processing circuit into the signal required by the transmission medium. The control circuit includes a signal conversion module and a second logic processing circuit. The signal conversion module converts the signal in the transmission medium into the signal required by the second logic circuit. The second logic processing circuit processes the fault signal fed back from the drive circuit, counts the count value between two rising edges, and this count value reflects the frequency of the feedback pulse. Then, the fault condition is determined according to the frequency segmentation of the fault type.

[0063] Specifically, the drive fault feedback method provided by this invention includes the following steps:

[0064] Step 1: First, determine the frequency segments corresponding to different situations, specifically as follows: Figure 7 As shown, 0Hz indicates a fiber optic fault; 0Hz~f N1 This is a low-frequency discard zone. Because the frequency in this region is low, the fault response is relatively slow, so this region is discarded. N1 ~f N2 This is the normal operating pulse feedback frequency range. Since the response level under normal operating conditions is lower than that under-voltage fault, the frequency range under normal operating conditions is set in a lower frequency region, where (f N1 +f N2 The value of f / 2 is generally between 100kHz and 200kHz. N1 =90% (f N1 +f N2 ) / 2, f N2 =110%(f) N1 +f N2 ) / 2;f N2 ~f U1 The frequency interval is 1. The purpose of setting this region is to reduce malfunctions caused by interference, and to provide feedback on interference; f U1 ~f U2 For undervoltage faults, since the response level of undervoltage faults is lower than that of short-circuit faults, the frequency range of undervoltage faults should be lower than that of short-circuit faults, where (f U1 +f U2The value of f / 2 is generally between 400kHz and 600kHz. U1 =90% (f U1 +f U2 ) / 2, f U2 =110%(f) U1 +f U2 ) / 2;f U1 ~f S1 The frequency interval is 2. The purpose of setting this region, besides reducing malfunctions caused by interference, is also to facilitate the differentiation between undervoltage faults and short-circuit faults; f S1 ~f S2 It is a short-circuit fault because short-circuit faults have the most stringent time response requirements, among which (f S1 +f S2 The value of f / 2 is generally between 800kHz and 1.2MHz. S1 =80% (f S1 +f S2 ) / 2, f S2 =120%(f) S1 +f S2 ) / 2;f S2 The range of 100Hz to +∞Hz is a high-frequency discard region because interference has the most significant impact on the high-frequency band, so this region is also discarded.

[0065] Step 2: First, fault detection is performed through the short circuit or undervoltage fault detection circuit, and then the detection level signal is fed back to the logic processing circuit 1.

[0066] Step 3: After receiving the detection level signal, logic processing circuit 1 first checks whether it is a short circuit fault. If it is a short circuit fault, it first latches the short circuit fault information and simultaneously changes the output fault square wave to a low level. After a 200ns counting period, the logic processing circuit sets the output fault signal high and continuously outputs a frequency of (f) with the high level as the initial value. S1 +f S2 A square wave with a duty cycle of 50% is generated. Then, an undervoltage fault is detected. If an undervoltage fault is detected, the undervoltage fault information is latched, and the output fault square wave is changed to a low level. After a 200ns logic processing circuit counts the points, the output fault signal is set high, and the output frequency is continuously maintained at a high level for an initial period of (f) / 2. U1 +f U2 A square wave with a duty cycle of 50% is output at a frequency of 1 / 2. If no fault signal is detected, and the system is in normal operating condition, the continuous output frequency is (f N1 +f N2 A square wave with a duty cycle of 50% (2) / 2. Figure 8 As shown.

[0067] Step 4: The signal conversion module of the drive circuit section converts the output signal of the logic processing circuit 1 into the signal required in the transmission medium.

[0068] Step 5: The signal from the output of the drive circuit is transmitted to the control circuit via a shielded metal wire or optical fiber.

[0069] Step 6: The signal in the transmission medium is converted into the signal required by the input of the logic processing circuit 2 through the signal conversion module of the control circuit section.

[0070] Step 7: After receiving the feedback signal, the logic processing circuit 2 in the control circuit section first determines the rising edge and counts based on the rising edge until the next rising edge. This count value yields the frequency of the signal transmission. Then, based on the frequency segments determined in Step 1, different situations are identified and fed back to the control system. The processing procedure is as follows: Figure 10 As shown. If the condition is ultimately determined to be a fault, the control circuit should immediately block the pulse.

[0071] This invention provides a driving fault feedback method and system. Using a single channel for fault information feedback significantly reduces device costs. Furthermore, by transmitting fault information based on the feedback pulse frequency, different frequency bands represent different faults, clearly distinguishing different fault types. It also avoids the pulse width loss problem inherent in single-channel pulse width feedback. By setting a wider fault frequency band and frequency interval, the impact of interference can be greatly reduced. Specific effects are shown below:

[0072] Frequency-based drive fault feedback method, normal waveform as follows Figure 10 As shown, when operating normally, logic processing circuit 1 will output a frequency of (f N1 +f N2 A continuous pulse of 1 / 2. The fault waveform is as follows: Figure 11 As shown, when a fault feedback cable fault occurs, the drive circuit outputs a low-level pulse with a feedback signal frequency of 0Hz. When a short-circuit fault occurs, the drive circuit outputs a feedback signal with a frequency of (f S1 +f S2 A continuous pulse of ) / 2, when an undervoltage fault occurs, the drive circuit outputs a feedback signal with a frequency of (f) / 2. U1 +f U2 A continuous pulse of ) / 2).

[0073] The feedback signal transmits the electrical or optical signal to the control circuit via a shielded metal wire or optical fiber.

[0074] After receiving the feedback signal, logic processing circuit 2 in the control circuit performs signal acquisition and processing according to step 7 to obtain the frequency of the feedback signal. If the received feedback pulse frequency is 0Hz, the fiber optic cable is faulty; if the received feedback signal pulse frequency is within f... N1 ~f N2 If the received feedback signal pulse frequency is within f, then it is working normally; U1 ~f U2 If the received feedback signal pulse frequency is at f, then it is an undervoltage fault; S1 ~f S2 If the received feedback signal pulse frequency is between 0Hz and f, then it is a short circuit fault; N1 This is the low-frequency discard zone, which helps avoid slow fault response; if the received feedback signal pulse frequency is within f... N2 ~f U1 If the frequency interval is 1, this area setting reduces malfunctions caused by interference; if the received feedback signal pulse frequency is at f U2 ~f S1 The frequency interval is 2. This setting clearly distinguishes between undervoltage faults and short-circuit faults, while reducing malfunctions caused by interference; the received feedback signal pulse frequency is at f S2 ~+∞Hz is the high-frequency discard zone. This zone is set to avoid interference affecting the high-frequency band.

[0075] The control circuit makes judgments based on the different situations determined by the logic processing circuit 2. If it is a fault situation, the pulse should be blocked immediately according to the different situations.

[0076] The drive fault feedback method proposed in this invention can be applied to drivers of high-power switching devices (IGBT, SiC MOSFET).

[0077] The fault detection circuit in the drive circuit section mainly includes short-circuit protection circuits and undervoltage protection circuits. The short-circuit protection circuit can be a desaturation detection circuit, a Rogowski coil current detection circuit, an inductor current detection circuit, etc. Figure 12 As shown, it is mainly used to protect high-power devices from short circuits; the undervoltage protection circuit can be built with a voltage monitoring chip and its peripheral circuit, or it can be built with independent components such as transistors. Figure 13 As shown, it is mainly used to protect against faults such as undervoltage of the drive voltage.

[0078] Logic processing circuit 1 selects a digital logic processor (FPGA) and is equipped with a 200MHz crystal oscillator. First, it checks for short-circuit faults. If a short-circuit fault is detected, the fault information is latched, and the output fault square wave is changed to a low level. After a 200ns counting period in the logic processing circuit, the output fault signal is set high, and the output frequency is continuously set to (f...). S1 +f S2 A square wave with a duty cycle of 50% is generated. Then, it checks for undervoltage faults. If an undervoltage fault is detected, the fault information is latched, and the output fault square wave is changed to a low level. After a 200ns logic processing circuit counts the points, the output fault signal is set high, and the output frequency is continuously maintained at a high level for an initial period of (f...). U1 +f U2 A square wave with a duty cycle of 50% (f / 2). If the detection is under normal operating conditions, the continuous output frequency is (f / 2). N1 +f N2 A square wave with a duty cycle of 50% (e.g.) / 2 Figure 8 As shown.

[0079] The signal conversion module of the drive circuit mainly converts the output signal of the logic processing circuit 1 into the signal in the transmission medium. The light generator HFBR1521 can be selected.

[0080] The transmission medium can be shielded metal wire or optical fiber, etc.

[0081] The signal conversion module in the control circuit section mainly converts the signal in the transmission medium into the signal required by the logic processing circuit 2. The optical receiver HFBR2521 can be selected.

[0082] Logic processing circuit 2 selects a digital logic processor FPGA and is equipped with a 200MHz crystal oscillator. The logic processing program flow is as follows: Figure 9 As shown. When logic processing circuit 2 receives the feedback signal, it first detects the rising edge signal. If no rising edge signal is detected, the counter is incremented by 1. If a rising edge signal is detected, the frequency is obtained based on the current count value, and the count value is cleared. The frequency is then used to determine which frequency range the signal falls within. If the received feedback pulse frequency is 0Hz, the fiber optic cable is faulty; if the received feedback pulse frequency is within f... N1 ~f N2 If the received feedback signal pulse frequency is within f, then it is working normally; U1 ~f U2 If the received feedback signal pulse frequency is at f, then it is an undervoltage fault; S1 ~f S2 If the received signal falls within a certain frequency range, it is considered a short circuit fault; if the received signal falls within other frequency ranges, it is considered interference.

[0083] Finally, the control circuit makes a judgment based on the different situations determined by the logic processing circuit 2. If it is a fault situation, the pulse should be blocked immediately according to the different situations.

[0084] This invention employs a single channel for fault information feedback, resulting in low cost. When a feedback cable fault occurs, a continuous high-level output is provided; when an undervoltage or short-circuit fault occurs, pulses of different frequencies are output, clearly distinguishing different faults. By setting low-frequency and high-frequency discard zones, and intervals 1 and 2, this invention can filter out waveforms of other frequencies caused by interference. Furthermore, the feedback pulses are continuous, allowing for multiple confirmations of fault information based on interference conditions, greatly increasing system reliability and program simplicity. Since this invention uses frequency to transmit fault information, there is no issue of pulse width loss.

[0085] The features described and / or illustrated above with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, and / or in combination with or in lieu of features in other embodiments.

[0086] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, components, or combinations thereof.

[0087] Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the invention are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0089] The parts of this invention not described in detail are techniques known to those skilled in the art.

Claims

1. A method for driving fault feedback, characterized in that, Includes the following steps Determine the frequency segments corresponding to different fault types; The detected fault level signal is fed back for logical processing; The fault priority is assessed, and the fault level signal is changed to low level according to the priority. After a certain number of counting points, the low level is changed to high level. The high level is used as the initial value to continuously output the frequency signal corresponding to different fault types. Collect frequency signals, count the value between two rising edges, and determine the fault type based on the obtained count value and the fault type frequency segment; The frequency segments corresponding to different fault types are determined as follows: the frequency segments include the fiber fault frequency region, the low frequency discard region, the normal operating frequency region, the first frequency interval, the undervoltage fault frequency region, the second frequency interval, the short circuit fault frequency region, and the high frequency discard region. The fiber optic fault frequency region is 0Hz, and the low-frequency discard region is 0Hz~ f N1 The normal operating frequency range is f N1 ~ f N2 The first frequency interval is f N2 ~ f U1 The undervoltage fault is f U1 ~ f U2 The second frequency interval is f U1 ~ f S1 The short-circuit fault is f S1 ~ f S2 The high-frequency discard region is f S2 ~+∞Hz; The method for outputting frequency signals corresponding to different fault types is as follows: First, check for a short circuit fault. If a short circuit fault is detected, latch the fault information, change the output fault square wave to a low level, and after several counting points, set the output fault signal high. The output frequency is then continuously maintained at a high level as the initial value. f S1 + f S2 ) / 2, a square wave with a duty cycle of 50%; Then, it checks if there is an undervoltage fault. If there is an undervoltage fault, it latches the undervoltage fault information, changes the output fault square wave to a low level, and after several counting points, sets the output fault signal high, with the high level as the initial continuous output frequency of ( f U1 + f U2 ) / 2, a square wave with a duty cycle of 50%; If no fault signal is detected, it is operating normally, and the continuous output frequency is ( f N1 + f N2 A square wave with a duty cycle of 50% (2 / 2).

2. The drive fault feedback method according to claim 1, characterized in that, ( f N1 + f N2 The value of ) / 2 ranges from 100kHz to 200kHz. f N1 =90%( f N1 + f N2 ) / 2, f N2 =110%( f N1 + f N2 ) / 2;( f U1 + f U2 The value of ) / 2 ranges from 400kHz to 600kHz. f U1 =90%( f U1 + f U2 ) / 2, f U2 =110%( f U1 + f U2 ) / 2;( f S1 + f S2 The value of ) / 2 ranges from 800kHz to 1.2MHz. f S1 =80%( f S1 + f S2 ) / 2, f S2 =120%( f S1 + f S2 ) / 2.

3. The drive fault feedback method according to claim 1, characterized in that, The fault priority is that short-circuit fault response is greater than undervoltage fault response.

4. A drive fault feedback system, characterized in that, The system comprising a drive circuit and a control circuit is used in any one of claims 1 to 3; The driving circuit includes Fault detection circuit, used to detect fault signals; The first logic processing circuit is used to determine the fault priority, change the fault signal of the drive circuit to low level according to the priority, and change the low level to high level after several counting points. Using this high level as the initial value, it continuously outputs the frequency signal corresponding to different fault types. A signal conversion module is used to convert the output signal in the first logic processing circuit into the signal required in the transmission medium. The control circuit includes A signal conversion module is used to convert signals in the transmission medium into signals required by the second logic circuit. The second logic processing circuit is used to process the fault signals of the drive circuit, count the count value between two rising edges, calculate the frequency of the feedback pulse, and determine the fault type according to the frequency segmentation of the fault type.

5. The drive fault feedback system according to claim 4, characterized in that, The transmission medium is a shielded metal wire or optical fiber; the first and second logic processing circuits are digital logic processors (FPGAs) equipped with a 200MHz crystal oscillator.

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