CN113364249A - Protection device and method for IGBT (insulated gate bipolar transistor) driving board and frequency converter - Google Patents
Protection device and method for IGBT (insulated gate bipolar transistor) driving board and frequency converter Download PDFInfo
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- CN113364249A CN113364249A CN202110759022.6A CN202110759022A CN113364249A CN 113364249 A CN113364249 A CN 113364249A CN 202110759022 A CN202110759022 A CN 202110759022A CN 113364249 A CN113364249 A CN 113364249A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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Abstract
The invention discloses a protection device and a method for an IGBT (insulated gate bipolar transistor) drive board and a frequency converter, wherein the device comprises the following components: a control unit configured to transmit a driving signal; the driving unit is configured to generate a secondary side driving signal by taking the driving signal as a primary side driving signal so as to drive the IGBT module by using the secondary side driving signal; a detection unit configured to detect a waveform of the primary side drive signal and a waveform of the secondary side drive signal to output a fault signal that the waveform of the secondary side drive signal is abnormal in a case where the waveform of the secondary side drive signal is abnormal; and the control unit is also configured to stop sending the driving signals according to the fault signal of the abnormal waveform of the secondary side driving signals so as to protect the IGBT driving board in the case of the abnormal waveform of the secondary side driving signals. According to the scheme, the IGBT driving board can perform feedback and protection aiming at the condition that the secondary side driving signal is interfered in the transmission process.
Description
Technical Field
The invention belongs to the technical field of frequency converters, and particularly relates to a protection device and a protection method for an IGBT (insulated gate bipolar transistor) drive board and a frequency converter, in particular to a device and a method for detecting and controlling a waveform of an original side gate pole and a secondary side gate pole of the IGBT drive board of a magnetic suspension frequency converter and the frequency converter.
Background
An IGBT (insulated gate bipolar transistor) driving board, which is one of the core components of a magnetic suspension frequency converter, has important output stability and operation reliability, and thus, the requirements for fault capture and fault protection of the IGBT driving board are high.
In a related scheme, short circuit desaturation detection, protection of an original secondary side IGBT drive board and Vce voltage (namely voltage between a collector and an emitter of the IGBT) detection are also configured on the IGBT drive board, and short circuit protection, undervoltage protection and overvoltage protection are realized through related circuit design. However, the cause of the short-circuit fault may be a substantial short-circuit (that is, a short-circuit does occur between different phases), or a short-circuit that occurs due to a direct connection caused by the upper and lower arms of a certain phase being simultaneously turned on due to interference of the driving waveform during transmission. In the related scheme, the IGBT driving board has no corresponding feedback and protection problems aiming at the condition that the secondary side driving signal is interfered in the transmission process.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a protection device and a protection method of an IGBT (insulated gate bipolar transistor) drive board and a frequency converter, which are used for solving the problem that the IGBT drive board has no corresponding feedback and protection aiming at the interference condition of a secondary side drive signal in the transmission process, and achieving the effect of performing feedback and protection aiming at the interference condition of the secondary side drive signal in the transmission process by the IGBT drive board.
The invention provides a protection device of an IGBT drive board, wherein the IGBT drive board comprises: the device comprises a driving unit, an IGBT module and a control unit; the protection device of IGBT drive plate includes: a detection unit; wherein the control unit is configured to transmit a driving signal; the driving unit is configured to generate a secondary side driving signal by taking the driving signal as a primary side driving signal so as to drive the IGBT module by using the secondary side driving signal; the detection unit is configured to detect a waveform of the primary side drive signal and a waveform of the secondary side drive signal to output a fault signal that the waveform of the secondary side drive signal is abnormal when the waveform of the secondary side drive signal is abnormal; the control unit is further configured to stop sending the driving signal according to a fault signal that the waveform of the secondary side driving signal is abnormal, so as to protect the IGBT driving board under the condition that the waveform of the secondary side driving signal is abnormal.
In some embodiments, the detection unit comprises: the device comprises a waveform comparison module and a fault feedback module; the detecting unit detects a waveform of the primary side driving signal and a waveform of the secondary side driving signal to output a fault signal that the waveform of the secondary side driving signal is abnormal when the waveform of the secondary side driving signal is abnormal, and the detecting unit includes: the waveform comparison module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, so as to determine that the waveform of the secondary side driving signal is normal under the condition that the waveform of the primary side driving signal and the waveform of the secondary side driving signal are both high level or low level; when the waveform of the secondary side driving signal is compared with the waveform of the primary side driving signal, and the situation that pulses in a set amplitude range are pulled down to a set negative voltage or pulled up to a set positive voltage occurs, determining that the waveform of the secondary side driving signal is abnormal, and generating a fault signal of the abnormal waveform of the secondary side driving signal; the fault feedback module is configured to feed back a fault signal that the waveform of the secondary side driving signal is abnormal to the control unit.
In some embodiments, the waveform comparison module comprises: a waveform processing module and an exclusive-nor module; the waveform comparing module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and includes: the waveform processing module is configured to output a waveform of the secondary side driving signal after the secondary side driving signal is shaped; the exclusive-nor module is configured to compare the waveform of the secondary side driving signal with the waveform of the primary side driving signal as a reference.
In some embodiments, the waveform processing module comprises: the device comprises a voltage division module, a first filtering module and a Schmitt trigger module; and the secondary side driving signal is shaped after passing through the voltage division module, the first filtering module and the Schmitt trigger module.
In some embodiments, the waveform comparison module further comprises: a current limiting module; the current limiting module is configured to limit the current of the primary side driving signal, so that the waveform of the primary side driving signal after current limiting is input to the exclusive-nor module.
In some embodiments, the fault feedback module comprises: the switch tube module and the optocoupler module; the output end of the waveform comparison module is connected to the control end of the switch tube module; the first connecting end of the switch tube module is connected with a direct-current power supply; the first connecting end of the switch tube module is also connected to an anode of a diode side in the optical coupling module; the second connecting end of the switch tube module is connected to a cathode of a diode side in the optical coupling module; and a collector electrode at the transistor side in the optical coupling module is used as an output end of the optical coupling module, and under the condition that the waveform of the secondary side driving signal is abnormal, a fault signal of the secondary side driving signal with the abnormal waveform is fed back to the control unit.
In some embodiments, the fault feedback module further comprises: at least one of a second filtering module and a third filtering module; under the condition that the fault feedback module further comprises a second filtering module, the second filtering module is arranged at the control end of the switch tube module; and under the condition that the fault feedback module further comprises a third filtering module, the third filtering module is arranged at the output end of the optical coupling module.
In some embodiments, the fault feedback module further comprises: a clamping module; and the clamping module is arranged at the output end of the optical coupling module.
In accordance with the above apparatus, another aspect of the present invention provides a frequency converter, including: the protection device of the IGBT drive board is described above.
In matching with the frequency converter, a further aspect of the present invention provides a method for protecting an IGBT driver board, where the IGBT driver board includes: the device comprises a driving unit, an IGBT module and a control unit; the protection method of the IGBT drive board comprises the following steps: sending a driving signal through a control unit; generating a secondary side driving signal by using the driving signal as a primary side driving signal through a driving unit so as to drive the IGBT module by using the secondary side driving signal; detecting the waveform of the primary side driving signal and the waveform of the secondary side driving signal through a detection unit so as to output a fault signal with abnormal waveform of the secondary side driving signal under the condition that the waveform of the secondary side driving signal is abnormal; and stopping sending the driving signal through a control unit according to a fault signal with abnormal waveform of the secondary side driving signal so as to protect the IGBT driving board under the condition of abnormal waveform of the secondary side driving signal.
Therefore, according to the scheme of the invention, the primary side driving signal and the secondary side driving signal of the IGBT driving board in the frequency converter are detected, the waveform of the primary side driving signal of the IGBT driving board in the frequency converter is compared with the waveform of the secondary side driving signal after shaping, and when the abnormal secondary side driving signal caused by interference is found, fault protection is carried out in time; therefore, the IGBT drive board can carry out feedback and protection aiming at the condition that the secondary side drive signal is interfered in the transmission process, so that short-circuit protection is carried out on the IGBT drive board in advance, and double insurance is provided for the short-circuit protection.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a protection device for an IGBT driver board according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a primary and secondary side waveform detection and control topology of an IGBT drive board according to the present invention;
FIG. 3 is a schematic diagram of the original secondary waveform and the corresponding waveform of the fault in the present invention;
FIG. 4 is a schematic diagram of an embodiment of a primary and secondary waveform detection and fault feedback circuit according to the present invention;
fig. 5 is a schematic flow chart of an embodiment of the protection method for the IGBT driver board according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a protection device of an IGBT driving board. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The IGBT drive board includes: the device comprises a driving unit, an IGBT module and a control unit. And a driving unit, such as a driving core circuit. And a control unit, such as a DSP control circuit. The control unit can send a primary side driving signal to the driving unit. The driving unit can generate a secondary side driving signal according to the primary side driving signal and drive the IGBT module by using the secondary side driving signal. Protection device of IGBT drive plate includes: a detection unit. The detection units, such as a waveform detection circuit and a fault feedback isolation circuit.
Wherein the control unit is configured to transmit a driving signal. The driving signal is a signal for driving the IGBT module.
The driving unit is configured to generate a secondary side driving signal by using the driving signal as a primary side driving signal, so as to drive the IGBT module by using the secondary side driving signal. For example: the primary side driving signal, namely a PWM waveform signal of 0/+15V or 0/+5V sent by the controller unit, is converted into an isolated +15/-10VPWM waveform signal through the driving plate, and is used as a secondary side driving signal to control the on/off of the IGBT.
The detection unit is configured to detect a waveform of the primary side drive signal and a waveform of the secondary side drive signal to output a fault signal that the waveform of the secondary side drive signal is abnormal when the waveform of the secondary side drive signal is abnormal.
The control unit is further configured to stop sending the driving signal according to a fault signal that the waveform of the secondary side driving signal is abnormal, so as to protect the IGBT driving board under the condition that the waveform of the secondary side driving signal is abnormal.
In order to confirm whether a short-circuit fault occurs substantially or due to a waveform abnormality of a driving signal caused by interference during transmission. The invention provides a scheme for detecting and controlling the primary and secondary side gate electrode waveforms of an IGBT driving plate of a magnetic suspension frequency converter. According to the scheme for detecting and controlling the original secondary side gate electrode waveform of the IGBT drive board of the magnetic suspension frequency converter, the original secondary side waveform of the IGBT drive board is detected and compared, fault protection is timely carried out when an abnormal secondary side drive signal caused by interference is found, so that the abnormal secondary side drive signal is used as pre-protection of short-circuit protection, short-circuit protection is carried out on the IGBT drive board in advance, double insurance is provided for short-circuit protection, and the problem that the IGBT drive board does not have corresponding feedback and protection aiming at the condition that the secondary side drive signal is interfered in the transmission process in the related scheme is solved.
For example: and judging whether the secondary side driving waveform is interfered or not by comparing the original secondary side waveform. Therefore, by detecting the original secondary side waveform, the false on-off in the off-off process can be found in time, the off-wave protection is carried out, and double guarantee is provided for short-circuit protection.
Meanwhile, the scheme of the invention can detect and compare the original secondary side waveform of the IGBT drive board, find abnormal secondary side drive signals caused by interference, facilitate the positioning of fault reasons under short-circuit fault, and solve the fault positioning problem that the frequency converter reports the IGBT drive short-circuit fault under the condition that substantial short circuit does not occur.
For example: and whether the secondary side driving waveform is interfered or not is judged by comparing the original secondary side waveform, so that fault positioning is facilitated. Therefore, the short-circuit fault reason caused by the interference of the driving waveform can be quickly confirmed through the waveform detection fault feedback, the short-circuit fault is conveniently positioned, and the fault solving time is saved.
In addition, according to the scheme of the invention, through waveform comparison faults, the interference condition under the current driving operation environment can be more visually represented, whether driving abnormity is caused is judged, and further EMC (electromagnetic compatibility) optimization is facilitated. That is to say, through the wave form detection trouble, can confirm the interference condition of converter operational environment, be convenient for EMC rectification.
Of course, the protection device for the IGBT driving board further includes: short-circuit protection unit, undervoltage protection unit, and overvoltage protection unit. Therefore, in the scheme of the invention, the IGBT drive board is designed to be provided with short circuit desaturation detection, protection of the original secondary side IGBT drive board and protection of the Vce IGBT drive board, and the detection function of driving the original secondary side gate electrode waveform detection fault is added. In the original secondary side waveform detection, whether the secondary side driving signal is abnormal or not is judged by comparing the original secondary side driving signal, and the abnormal waveform is output and output is actively closed, so that the probability of short-circuit fault of the current driving board is reduced, the protection of the IGBT driving board is enhanced, the reliability is improved, and the fault reason after the short-circuit fault is conveniently positioned.
That is, in order to verify whether a short-circuit fault of the IGBT module occurs substantially, or a short-circuit fault occurs due to a waveform abnormality caused by interference during transmission of the driving signal. That is to say, the scheme of the invention provides a method for detecting and controlling the original secondary side gate pole waveform of a magnetic suspension frequency converter driving plate, which judges whether the secondary side driving signal is abnormal or not by comparing the original secondary side driving signal, outputs a fault to the abnormal waveform and actively closes the output, thereby reducing the probability of short-circuit fault of the current driving, strengthening IGBT driving protection, improving reliability and simultaneously facilitating the positioning of the fault reason after the short-circuit fault.
The driving waveform is interfered in the transmission process, so that the upper bridge arm and the lower bridge arm of a certain phase are simultaneously switched on to cause direct connection and short circuit, short circuit protection can be obtained, but the reason of the short circuit fault is inconvenient to confirm. According to the scheme, the double protection of short circuit can be provided and fault location can be facilitated by comparing the waveforms, and if the IGBT fault is stopped and a desaturation fault + the waveform abnormal fault signal is read, the fact that the waveform is interfered in the transmission process can be determined. The fault detection scheme of the invention is an optimized scheme, namely, the original drive fault detection can provide protection under the fault condition, and the fault detection of the scheme of the invention is only considered to be added under the application condition to be more beneficial to application, so that the engineering problem in use, namely the fault positioning problem, and whether the drive waveform of the drive plate is influenced under the operation environment can be really solved.
In some embodiments, the detection unit comprises: the device comprises a waveform comparison module and a fault feedback module. And a waveform comparing module, such as a waveform detecting circuit. Fault feedback modules, such as fault feedback isolation circuits.
The detecting unit detects a waveform of the primary side driving signal and a waveform of the secondary side driving signal to output a fault signal that the waveform of the secondary side driving signal is abnormal when the waveform of the secondary side driving signal is abnormal, and the detecting unit includes:
the waveform comparison module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, so as to determine that the waveform of the secondary side driving signal is normal under the condition that the waveform of the primary side driving signal and the waveform of the secondary side driving signal are both at a high level or a low level. And when the waveform of the secondary side driving signal is compared with the waveform of the primary side driving signal and the situation that the pulse within the set amplitude range is pulled down to a set negative voltage or pulled up to a set positive voltage occurs, determining that the waveform of the secondary side driving signal is abnormal and generating a fault signal of the abnormal waveform of the secondary side driving signal.
The fault feedback module is configured to feed back a fault signal that the waveform of the secondary side driving signal is abnormal to the control unit.
The scheme of the invention is suitable for the field of primary and secondary side waveform detection and control of the IGBT drive plate of the high-power magnetic suspension frequency converter, and in order to enable a person in the technical field to more clearly understand the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described below by combining specific operations and referring to the attached drawings.
Fig. 2 is a schematic structural diagram of an embodiment of a primary and secondary side waveform detection and control topology of an IGBT driver board according to the present invention. Fig. 2 can illustrate the original secondary side waveform detection and control topology of the IGBT drive board. As shown in fig. 2, the topology or circuit for detecting and controlling the primary and secondary side waveforms of the IGBT driver board includes: the device comprises a DSP control circuit, an interlocking circuit, a Schmidt shaping circuit, a driving core circuit, an IGBT module and a primary and secondary side waveform detection and fault feedback circuit (namely a waveform detection circuit and a fault feedback isolation circuit).
The interlocking circuit is a circuit which processes the primary side driving signal to prevent the primary side driving signal from being at the same high level, and can ensure that the signal transmitted to the driving plate is normal.
The schmitt shaping circuit, as well as the waveform processing circuit used for shaping the secondary drive signal in fig. 4, serves the purpose of shaping the PWM wave and makes the rising and falling edges steeper.
The DSP control circuit outputs a driving PWM wave, and the driving PWM wave is used as a primary side driving signal after being subjected to PWM wave shaping by the Schmitt trigger and is input to a primary side of the driving core circuit. The driving core circuit includes, but is not limited to, a driving core and a driving chip. The driver boards in some schemes are generally two schemes, one based on a separate scheme of driver ICs, such as the british flying manufacturer 1ED020I 12; the other is a driving core scheme such as PI 2SC 0435T. A peripheral protection circuit and other circuits are added on the basis of a driving IC or a driving core to finally form a driving board, but the driving IC or the driving core is the core.
The primary side driving signal is converted into a secondary side driving signal after passing through the driving core circuit, and drives the rear-stage IGBT module. The waveform detection circuit judges whether the PWM waveform output by the driving secondary side is abnormal or not by comparing the original secondary side driving waveform, if so, the waveform detection fault is changed into low level and is fed back to the DSP control circuit through the optical coupling isolation circuit, and the DSP control circuit actively closes the PWM waveform output to protect after receiving a fault signal. If the drive plate triggers the short-circuit fault due to the abnormal secondary drive waveform, the fault location can be detected through the feedback waveform, so that the short-circuit fault is triggered due to the interference of the drive signal, and the fault reason location is facilitated. And detecting and positioning faults through the feedback waveforms, for example, a fault feedback circuit, namely a Complex Programmable Logic Device (CPLD) and a peripheral circuit, is adopted, characteristic faults are returned by processing a plurality of different faults, and the control circuit DSP can read out corresponding fault types by reading and judging the characteristic fault waveforms.
In some embodiments, the waveform comparison module comprises: a waveform processing module and an exclusive-nor module. The exclusive OR gate module is like an exclusive OR gate arithmetic unit U2.
The waveform comparing module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and includes:
the waveform processing module is configured to output the waveform of the secondary side driving signal after the secondary side driving signal is shaped.
The exclusive-nor module is configured to compare the waveform of the secondary side driving signal with the waveform of the primary side driving signal as a reference, so as to determine that the waveform of the secondary side driving signal is normal under the condition that the waveform of the primary side driving signal and the waveform of the secondary side driving signal are both at a high level or a low level. And when the waveform of the secondary side driving signal is compared with the waveform of the primary side driving signal and the situation that the pulse within the set amplitude range is pulled down to a set negative voltage or pulled up to a set positive voltage occurs, determining that the waveform of the secondary side driving signal is abnormal and generating a fault signal of the abnormal waveform of the secondary side driving signal.
Fig. 3 is a schematic diagram of waveforms of an original secondary side waveform and a corresponding fault waveform. Fig. 3 can illustrate a waveform diagram corresponding to the primary and secondary sides and the fault. As shown in fig. 3, when the primary and secondary gate waveforms of the driving core circuit (i.e., the core circuit of the driving board) are detected and compared, and the secondary waveform is detected to be abnormal compared with the primary input waveform, the waveform detection fault outputs a low-level feedback fault signal.
The primary side waveform is a comparative reference waveform, the secondary side signal sets turning voltages V + and V-through a Schmidt trigger, wherein V + is the switching-on threshold voltage of an IGBT module, V-is the switching-off threshold voltage of the IGBT module, the turning voltages are input into an exclusive-OR gate comparator for comparison after shaping, when the primary side waveform and the secondary side shaped waveform have the same high level or the same low level, namely under the normal condition, the exclusive-OR gate outputs the high level, and the fault signal is finally output to a high level signal of a DSP control circuit. When the narrow pulse is pulled down to V-under the condition of the primary side high level of the waveform after the secondary side is shaped or the narrow pulse is pulled up to straighten V + under the condition of the primary side low level, namely, the same or gate outputs the low level under the fault state, and the fault signal finally outputs the low level signal.
In some embodiments, the waveform processing module comprises: the device comprises a voltage division module, a first filtering module and a Schmitt trigger module. The voltage dividing module is composed of a resistor R2 and a resistor R3. A first filtering module, such as a capacitor C1. Schmitt trigger modules, such as schmitt trigger U1.
And the secondary side driving signal is shaped after passing through the voltage division module, the first filtering module and the Schmitt trigger module so as to obtain the waveform of the secondary side driving signal.
Fig. 4 is a schematic structural diagram of an original secondary side waveform detection and fault feedback circuit according to an embodiment of the present invention. Fig. 4 can illustrate a circuit diagram of primary and secondary waveform detection and fault feedback. As shown in fig. 4, the primary and secondary side waveform detection and fault feedback circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a Schmidt trigger U1.
IN the primary and secondary waveform detection and fault feedback circuit shown IN fig. 4, the primary PWM driving signal PWM _ IN and the secondary PWM driving signal PWM _ OUT are processed by a waveform processing circuit formed by dividing voltage by a resistor R2 and a resistor R3, filtering by a capacitor C1, and triggering by a schmitt trigger U1.
In some embodiments, the waveform comparison module further comprises: a current limiting module such as resistor R1.
The current limiting module is configured to limit the current of the primary side driving signal, so that the waveform of the primary side driving signal after current limiting is input to the exclusive-nor module.
Preferably, after the current of the waveform of the primary side driving signal is limited by a current limiting resistor, such as a resistor R1, the exclusive-nor module can protect the safety of the input signal of the schmitt trigger module with reference to the waveform of the primary side driving signal after the current limiting.
In some embodiments, the fault feedback module comprises: switch tube module and opto-coupler module. And a switching tube module, such as a MOS switching tube Q1. And the optical coupling module is an optical coupler U3.
The output end of the waveform comparing module is connected to the control end of the switching tube module, such as the gate of a MOS switching tube Q1. The first connection end of the switching tube module, such as the drain of the MOS switching tube Q1, is connected to a dc power supply, preferably a +15V dc power supply via a resistor R5.
The first connecting end of the switch tube module is also connected to an anode of a diode side in the optical coupling module. And a second connection end of the switch tube module, such as a source electrode of the MOS switch tube Q1, is connected to a cathode on the side of a diode in the optical coupling module.
And a collector electrode at the transistor side in the optical coupling module is used as an output end of the optical coupling module, and under the condition that the waveform of the secondary side driving signal is abnormal, a fault signal of the secondary side driving signal with the abnormal waveform is fed back to the control unit.
As shown in fig. 4, the primary and secondary side waveform detection and fault feedback circuit further includes: the circuit comprises a resistor R4, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, a MOS switch tube Q1, an optical coupling isolation device U3, a diode D1 and a diode D2. The emitter of the transistor side in the optically coupled isolation device U3 is connected to digital DGND.
Wherein, the logic of the waveform detection fault feedback is as follows: when the waveform comparison result is normal, the same or gate outputs a high level, the high level enables the MOS switch tube Q1 to be switched on, the output signal is pulled down to the common ground GND, the light-emitting LED in the optical coupling isolation device U3 does not emit light, and the output is the high level. When the waveform comparison result is abnormal, the same or gate outputs low level, the MOS switch tube Q1 is turned off, the output signal is pulled up to +15V, the light-emitting LED in the optical coupling isolation device U3 emits light, and the output is low level.
In some embodiments, the fault feedback module further comprises: at least one of the second filtering module and the third filtering module. And a second filtering module, such as a filter formed by a resistor R4 and a capacitor C2. And a third filtering module, such as a filtering module consisting of a resistor R6 and a capacitor C3.
And under the condition that the fault feedback module further comprises a second filtering module, the second filtering module is arranged at the control end of the switch tube module.
And under the condition that the fault feedback module further comprises a third filtering module, the third filtering module is arranged at the output end of the optical coupling module.
IN the original secondary side waveform detection and fault feedback circuit shown IN fig. 4, a waveform of a secondary side driving signal PWM _ OUT processed by a waveform processing circuit formed by voltage division by a resistor R2 and a resistor R3, filtering by a capacitor C1, and triggering by a schmitt trigger U1 is compared with a waveform of a primary side PWM driving signal PWM _ IN by an exclusive nor gate and output to control a rear stage MOS switch tube Q1, and then is fed back to a DSP control circuit by a filter circuit formed by an opto-isolator U3, a resistor R6, and a capacitor C3. And the resistor R1 is used for limiting current. A resistor R4 and a capacitor C2 for filtering. And the resistor R5 is used for limiting current.
In some embodiments, the fault feedback module further comprises: a clamping block, such as one consisting of diode D1 and diode D2. And the clamping module is arranged at the output end of the optical coupling module.
As shown in fig. 4, the primary and secondary side waveform detection and fault feedback circuit further includes: diode D1 and diode D2. Diode D1 and diode D2 for clamping.
IN the example shown IN fig. 4, the secondary side driving signal PWM _ OUT is subjected to waveform processing and then input to an exclusive or operator for waveform comparison with the primary side driving signal PWM _ IN. For the exclusive-nor operator, when the input driving waveform of the primary side driving signal PWM _ IN and the waveform output by the secondary side driving signal PWM _ OUT after being shaped are not switched on or off simultaneously, that is, the secondary side driving signal PWM _ OUT is switched on or off by mistake, the exclusive-nor operator outputs a low level signal, and then a FAULT feedback and isolation circuit at the rear end of the exclusive-nor operator feeds a FAULT signal FAULT _ DSP back to the DSP control circuit to trigger protection (for example, trigger driving waveform abnormal protection). The diagonal lines in fig. 3 indicate time slices, and the waveform after restart follows the diagonal lines.
In the above embodiments, the parameters including specific values are exemplified, but it should be understood that the parameters are not necessarily exactly equal to the corresponding values, and should be determined according to actual situations.
In the above embodiments, the examples include, but are not limited to, comparing the original secondary side waveform with the or gate, and comparing the waveform with the fault feedback.
Through a large number of tests, the technical scheme of the invention is adopted, and the waveform of the primary side driving signal of the IGBT driving board in the frequency converter and the waveform of the shaped secondary side driving signal are compared by detecting the primary side driving signal and the secondary side driving signal of the IGBT driving board in the frequency converter, so that when the abnormal secondary side driving signal caused by interference is found, fault protection is carried out in time. Therefore, the IGBT drive board can carry out feedback and protection aiming at the condition that the secondary side drive signal is interfered in the transmission process, so that short-circuit protection is carried out on the IGBT drive board in advance, and double insurance is provided for the short-circuit protection.
According to the embodiment of the invention, the frequency converter corresponding to the protection device of the IGBT driving board is also provided. The frequency converter may include: the protection device of the IGBT drive board is described above.
Since the processing and functions implemented by the frequency converter of this embodiment substantially correspond to the embodiments, principles, and examples of the foregoing apparatus, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
Through a large number of tests, the technical scheme of the invention is adopted, the primary side driving signal and the secondary side driving signal of the IGBT driving board in the frequency converter are detected, the waveform of the primary side driving signal of the IGBT driving board in the frequency converter and the waveform of the shaped secondary side driving signal are compared, when the abnormal secondary side driving signal caused by interference is found, the fault protection is carried out in time, and the fault location problem that the IGBT driving short-circuit fault is reported when the frequency converter is not in a substantial short-circuit condition is solved.
According to the embodiment of the present invention, there is also provided a protection method for an IGBT driver board corresponding to a frequency converter, as shown in fig. 5, which is a schematic flow chart of an embodiment of the method of the present invention. The IGBT drive board includes: the device comprises a driving unit, an IGBT module and a control unit. And a driving unit, such as a driving core circuit. And a control unit, such as a DSP control circuit. The control unit can send a primary side driving signal to the driving unit. The driving unit can generate a secondary side driving signal according to the primary side driving signal and drive the IGBT module by using the secondary side driving signal. The protection method of the IGBT driving board comprises the following steps: step S110 to step S140.
At step S110, a driving signal is transmitted by the control unit. The driving signal is a signal for driving the IGBT module.
In step S120, a secondary driving signal is generated by the driving unit using the driving signal as a primary driving signal, so as to drive the IGBT module with the secondary driving signal.
At step S130, detecting, by a detection unit, a waveform of the primary side driving signal and a waveform of the secondary side driving signal to output a fault signal that the waveform of the secondary side driving signal is abnormal, in case the waveform of the secondary side driving signal is abnormal. The detection units, such as a waveform detection circuit and a fault feedback isolation circuit.
In step S140, the control unit stops sending the driving signal according to the fault signal that the waveform of the secondary side driving signal is abnormal, so as to protect the IGBT driving board in case that the waveform of the secondary side driving signal is abnormal.
In order to confirm whether a short-circuit fault occurs substantially or due to a waveform abnormality of a driving signal caused by interference during transmission. The invention provides a scheme for detecting and controlling the primary and secondary side gate electrode waveforms of an IGBT driving plate of a magnetic suspension frequency converter. According to the scheme for detecting and controlling the original secondary side gate electrode waveform of the IGBT drive board of the magnetic suspension frequency converter, the original secondary side gate electrode waveform of the IGBT drive board is detected and compared, fault protection is timely carried out when an abnormal secondary side drive signal caused by interference is found, so that short-circuit protection is carried out on the IGBT drive board in advance, double insurance is provided for short-circuit protection, and the problem that the IGBT drive board does not have corresponding feedback and protection aiming at the situation that the secondary side drive signal is interfered in the transmission process in the related scheme is solved.
For example: and judging whether the secondary side driving waveform is interfered or not by comparing the original secondary side waveform. Therefore, by detecting the original secondary side waveform, the false on-off in the off-off process can be found in time, the off-wave protection is carried out, and double guarantee is provided for short-circuit protection.
Meanwhile, the scheme of the invention can detect and compare the original secondary side waveform of the IGBT drive board, find abnormal secondary side drive signals caused by interference, facilitate the positioning of fault reasons under short-circuit fault, and solve the fault positioning problem that the frequency converter reports the IGBT drive short-circuit fault under the condition that substantial short circuit does not occur.
For example: and whether the secondary side driving waveform is interfered or not is judged by comparing the original secondary side waveform, so that fault positioning is facilitated. Therefore, the short-circuit fault reason caused by the interference of the driving waveform can be quickly confirmed through the waveform detection fault feedback, the short-circuit fault is conveniently positioned, and the fault solving time is saved.
In addition, according to the scheme of the invention, through waveform comparison faults, the interference condition under the current driving operation environment can be more visually represented, whether driving abnormity is caused is judged, and further EMC (electromagnetic compatibility) optimization is facilitated. That is to say, through the wave form detection trouble, can confirm the interference condition of converter operational environment, be convenient for EMC rectification.
Of course, the protection device for the IGBT driving board further includes: short-circuit protection unit, undervoltage protection unit, and overvoltage protection unit. Therefore, in the scheme of the invention, the IGBT drive board is designed to be provided with short circuit desaturation detection, protection of the original secondary side IGBT drive board and protection of the Vce IGBT drive board, and the detection function of driving the original secondary side gate electrode waveform detection fault is added. In the original secondary side waveform detection, whether the secondary side driving signal is abnormal or not is judged by comparing the original secondary side driving signal, and the abnormal waveform is output and output is actively closed, so that the probability of short-circuit fault of the current driving board is reduced, the protection of the IGBT driving board is enhanced, the reliability is improved, and the fault reason after the short-circuit fault is conveniently positioned.
That is, in order to verify whether a short-circuit fault of the IGBT module occurs substantially, or a short-circuit fault occurs due to a waveform abnormality caused by interference during transmission of the driving signal. That is to say, the scheme of the invention provides a method for detecting and controlling the original secondary side gate pole waveform of a magnetic suspension frequency converter driving plate, which judges whether the secondary side driving signal is abnormal or not by comparing the original secondary side driving signal, outputs a fault to the abnormal waveform and actively closes the output, thereby reducing the probability of short-circuit fault of the current driving, strengthening IGBT driving protection, improving reliability and simultaneously facilitating the positioning of the fault reason after the short-circuit fault.
Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the frequency converter, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
Through a large number of tests, the technical scheme of the embodiment is adopted, the primary side driving signal and the secondary side driving signal of the IGBT driving board in the frequency converter are detected, the waveform of the primary side driving signal of the IGBT driving board in the frequency converter and the waveform of the shaped secondary side driving signal are compared, when the abnormal secondary side driving signal caused by interference is found, fault protection is timely carried out, the short-circuit fault reason caused by the interference of the driving waveform can be rapidly confirmed, the short-circuit fault location is convenient, and the fault solving time is saved.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A protection device of an IGBT drive board, characterized in that, the IGBT drive board includes: the device comprises a driving unit, an IGBT module and a control unit; the protection device of IGBT drive plate includes: a detection unit; wherein the content of the first and second substances,
the control unit configured to transmit a driving signal;
the driving unit is configured to generate a secondary side driving signal by taking the driving signal as a primary side driving signal so as to drive the IGBT module by using the secondary side driving signal;
the detection unit is configured to detect a waveform of the primary side drive signal and a waveform of the secondary side drive signal to output a fault signal that the waveform of the secondary side drive signal is abnormal when the waveform of the secondary side drive signal is abnormal;
the control unit is further configured to stop sending the driving signal according to a fault signal that the waveform of the secondary side driving signal is abnormal, so as to protect the IGBT driving board under the condition that the waveform of the secondary side driving signal is abnormal.
2. The protection device for an IGBT driving board according to claim 1, wherein the detection unit includes: the device comprises a waveform comparison module and a fault feedback module; wherein the content of the first and second substances,
the detecting unit detects a waveform of the primary side driving signal and a waveform of the secondary side driving signal to output a fault signal that the waveform of the secondary side driving signal is abnormal when the waveform of the secondary side driving signal is abnormal, and the detecting unit includes:
the waveform comparison module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, so as to determine that the waveform of the secondary side driving signal is normal under the condition that the waveform of the primary side driving signal and the waveform of the secondary side driving signal are both high level or low level; when the waveform of the secondary side driving signal is compared with the waveform of the primary side driving signal, and the situation that pulses in a set amplitude range are pulled down to a set negative voltage or pulled up to a set positive voltage occurs, determining that the waveform of the secondary side driving signal is abnormal, and generating a fault signal of the abnormal waveform of the secondary side driving signal;
the fault feedback module is configured to feed back a fault signal that the waveform of the secondary side driving signal is abnormal to the control unit.
3. The protection device for the IGBT drive board according to claim 2, wherein the waveform comparison module comprises: a waveform processing module and an exclusive-nor module; wherein the content of the first and second substances,
the waveform comparing module is configured to receive the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and compare the waveform of the primary side driving signal and the waveform of the secondary side driving signal, and includes:
the waveform processing module is configured to output a waveform of the secondary side driving signal after the secondary side driving signal is shaped;
the exclusive-nor module is configured to compare the waveform of the secondary side driving signal with the waveform of the primary side driving signal as a reference.
4. The protection device for the IGBT drive board according to claim 3, wherein the waveform processing module comprises: the device comprises a voltage division module, a first filtering module and a Schmitt trigger module; wherein the content of the first and second substances,
and the secondary side driving signal is shaped after passing through the voltage division module, the first filtering module and the Schmitt trigger module.
5. The protection device for an IGBT driver board according to claim 3, wherein the waveform comparison module further comprises: a current limiting module;
the current limiting module is configured to limit the current of the primary side driving signal, so that the waveform of the primary side driving signal after current limiting is input to the exclusive-nor module.
6. The protection device for an IGBT drive board according to any one of claims 2 to 5, wherein the fault feedback module comprises: the switch tube module and the optocoupler module; wherein the content of the first and second substances,
the output end of the waveform comparison module is connected to the control end of the switch tube module; the first connecting end of the switch tube module is connected with a direct-current power supply;
the first connecting end of the switch tube module is also connected to an anode of a diode side in the optical coupling module; the second connecting end of the switch tube module is connected to a cathode of a diode side in the optical coupling module;
and a collector electrode at the transistor side in the optical coupling module is used as an output end of the optical coupling module, and under the condition that the waveform of the secondary side driving signal is abnormal, a fault signal of the secondary side driving signal with the abnormal waveform is fed back to the control unit.
7. The protection device for an IGBT driver board according to claim 6, wherein the fault feedback module further comprises: at least one of a second filtering module and a third filtering module; wherein the content of the first and second substances,
under the condition that the fault feedback module further comprises a second filtering module, the second filtering module is arranged at the control end of the switch tube module;
and under the condition that the fault feedback module further comprises a third filtering module, the third filtering module is arranged at the output end of the optical coupling module.
8. The protection device for an IGBT driver board according to claim 6, wherein the fault feedback module further comprises: a clamping module; and the clamping module is arranged at the output end of the optical coupling module.
9. A frequency converter, comprising: protection device of an IGBT driver board according to any one of claims 1 to 8.
10. A protection method of an IGBT drive board is characterized in that the IGBT drive board comprises the following steps: the device comprises a driving unit, an IGBT module and a control unit; the protection method of the IGBT drive board comprises the following steps:
sending a driving signal through a control unit;
generating a secondary side driving signal by using the driving signal as a primary side driving signal through a driving unit so as to drive the IGBT module by using the secondary side driving signal;
detecting the waveform of the primary side driving signal and the waveform of the secondary side driving signal through a detection unit so as to output a fault signal with abnormal waveform of the secondary side driving signal under the condition that the waveform of the secondary side driving signal is abnormal;
and stopping sending the driving signal through a control unit according to a fault signal with abnormal waveform of the secondary side driving signal so as to protect the IGBT driving board under the condition of abnormal waveform of the secondary side driving signal.
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