CN113472336A - Narrow pulse processing structure and processing method thereof - Google Patents
Narrow pulse processing structure and processing method thereof Download PDFInfo
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- CN113472336A CN113472336A CN202110657587.3A CN202110657587A CN113472336A CN 113472336 A CN113472336 A CN 113472336A CN 202110657587 A CN202110657587 A CN 202110657587A CN 113472336 A CN113472336 A CN 113472336A
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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
- H03K17/72—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 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
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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
- H03K17/04—Modifications for accelerating switching
- H03K17/041—Modifications for accelerating switching without feedback from the output circuit to the control circuit
- H03K17/04113—Modifications for accelerating switching without feedback from the output circuit to the control circuit in bipolar transistor switches
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Abstract
The invention discloses a narrow pulse processing structure and a processing method thereof, wherein the structure comprises: a current signal conversion unit for converting a current detected in the device into a voltage signal; the comparator module is connected with the current signal conversion unit, compares the voltage value of the voltage signal with a voltage reference value and outputs a corresponding digital signal according to a comparison result; and the logic processing module is connected with the comparator module, acquires a current interval corresponding to the current according to the digital signal and judges whether the current interval is smaller than the safe turn-off current or not. The invention makes the local board not need to process the narrow pulse, reduces the software overhead of the control board and improves the application range of the drive board.
Description
Technical Field
The invention belongs to the field of signal processing, and particularly relates to a narrow pulse processing structure and a processing method thereof.
Background
The turn-off capability of thyristor type devices (such as thyristors, integrated gate commutated thyristors IGCT, emitter turn-off thyristors ETO, etc.) under shorter conduction signals (commonly called narrow pulses) is greatly weakened, and if drive control is not performed on the narrow pulse signals, the failure probability of the thyristor type devices is greatly increased.
The existing narrow pulse processing methods are generally two, one is that the narrow pulse processing method is implemented through drive plate processing, a drive plate receives a conduction instruction of an on-site floor (the on-site floor is a full-name on-site control plate which is located near the drive plate and can be connected with one or more drive plates through optical fiber communication), then a thyristor type device is switched on, signals received by the on-site floor are shielded, and the signals are received until the conduction time is longer than the minimum time of the narrow pulse, and then the signals are received, so that the processing method has the risk of misjudgment of the on-site floor faults (the on-site floor sends a switching-off instruction to the drive plate, but the drive plate is still in a conducting state for shielding the narrow pulse, and the drive plate is misjudged to have a switching-off fault by the on-site floor); the other method is that the local board is processed, the local board sends a conduction command to the driving board after receiving the conduction command of the valve control system, and then the receiving signal of the valve control system is shielded until the conduction time is longer than the minimum time of the narrow pulse and then the signal is received.
Disclosure of Invention
In view of the above problems, the present invention provides a narrow pulse processing structure and a processing method thereof, which can reduce the failure probability of a thyristor.
In order to achieve the purpose, the invention adopts the technical scheme that: a narrow pulse processing structure comprising:
a current signal conversion unit for converting a current detected in the device into a voltage signal;
the comparator module is connected with the current signal conversion unit, compares the voltage value of the voltage signal with a voltage reference value and outputs a corresponding digital signal according to a comparison result; and
and the logic processing module is connected with the comparator module, acquires a current interval corresponding to the current according to the digital signal and judges whether the current interval is smaller than the safe turn-off current or not.
Optionally, the current signal conversion unit includes:
the detection module is used for detecting current and converting the current into an analog signal;
and the signal conditioning module is connected with the detection module and used for converting the analog signal into a voltage signal.
Optionally, the detection module is a current sensor.
Optionally, the signal conditioning module comprises an operational amplifier.
Optionally, the comparator module includes a plurality of operational amplifier comparison circuits, negative input pins of the operational amplifier comparison circuits are connected to voltages with different reference values, a positive input pin is connected to the current signal conversion unit, and an output pin is connected to the logic processing module.
Optionally, the voltage reference values accessed by the plurality of operational amplifier comparison circuits are sequentially and gradually increased and respectively correspond to the current reference values, the voltage signal outputs a digital signal through the plurality of operational amplifier comparison circuits, and the logic processing module obtains a corresponding current interval according to the digital signal comparison with the current reference values.
Optionally, the processing structure further includes a driving board and a control board connected to the driving board, and the logic processing module is mounted on the driving board.
And, a shutdown circuit, comprising:
the narrow pulse processing structure described above; and
the cathode of the thyristor is connected with the input end of the current signal processing unit of the narrow pulse processing structure, and a switching-on module and a switching-off module which are arranged in parallel are connected between the gate pole of the thyristor and the logic processing module of the narrow pulse processing structure.
And, a narrow pulse processing method, comprising the steps of:
converting the current detected in the device into a voltage signal;
comparing the voltage value of the voltage signal with a voltage reference value by using a comparison circuit, and outputting a corresponding digital signal according to a comparison result;
obtaining a current interval corresponding to the current according to the digital signal;
and judging whether the current interval is smaller than the safe turn-off current or not.
Optionally, in the step of converting the current detected in the device into a voltage signal, specifically:
detecting a current and converting the current into an analog signal;
converting the analog signal to a voltage signal.
Optionally, the number of the comparison circuits is multiple, and the comparison circuits correspond to multiple voltage reference values with gradually increasing values, the multiple voltage reference values respectively correspond to current reference values, and the multiple current reference values with gradually increasing values form multiple current intervals;
in the step of outputting the digital signal and obtaining the current interval, the method specifically comprises the following steps:
comparing the voltage signals with a plurality of comparison circuits and outputting the digital signals;
obtaining voltage reference values which are closest to two ends of the magnitude of the voltage signal value according to the digital signal;
and obtaining two corresponding current reference values according to the voltage reference value to form a current interval.
Optionally, if the current interval is judged to be smaller than the safe turn-off current, performing turn-off operation;
and if the current interval is judged to be larger than or equal to the safe turn-off current, delaying to wait for the current flowing through the device to enter the safe turn-off current and then carrying out turn-off operation.
Optionally, before the step of converting the current detected in the device into a voltage signal, the method further comprises the steps of:
the logic processing module receives a turn-off instruction sent by the control panel;
judging whether the current of the current device is in a narrow pulse stage;
if the pulse is in the narrow pulse stage, voltage signal conversion is carried out;
and if the pulse is not in the narrow pulse stage, performing turn-off operation.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the local board does not need to process the narrow pulse, so that the software overhead of the control board is reduced, and the application range of the drive board is improved;
under the condition of failure, the drive plate can be prevented from being influenced by narrow pulses to the maximum extent and is turned off in time, and the failure probability of the thyristor is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a block diagram of a narrow pulse processing architecture according to an embodiment of the invention;
FIG. 2 is a diagram illustrating a current pass current setting of a device in relation to a digital signal according to an embodiment of the present invention;
fig. 3 shows a logic diagram of the shutdown process in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present 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.
As shown in fig. 1, the narrow pulse processing structure of the embodiment of the present invention includes a current signal conversion unit, a comparator module, and a logic processing module. The current signal conversion unit is used for converting the current detected in the device into a voltage signal; the comparator module is connected with the current signal conversion unit, compares the voltage value of the voltage signal with a voltage reference value and outputs a corresponding digital signal according to a comparison result; the logic processing module is connected with the comparator module, acquires a current interval corresponding to the current according to the digital signal, and judges whether the current interval is smaller than the safe turn-off current.
Based on the above narrow pulse processing structure according to the embodiment of the present invention, a narrow pulse processing method according to the embodiment of the present invention is further described, which includes the following steps:
s1: converting the current detected in the device into a voltage signal;
in the present embodiment, a current signal conversion unit is specifically used to convert a current detected in the device into a voltage signal.
S2: comparing the voltage value of the voltage signal with a voltage reference value by using a comparison circuit, and outputting a corresponding digital signal according to a comparison result;
s3: obtaining a current interval corresponding to the current according to the digital signal;
s4: and judging whether the current interval is smaller than the safe turn-off current or not.
Further, the narrow pulse processing structure according to the embodiment of the present invention may be applied to a turn-off circuit, as shown in fig. 1, the turn-off circuit includes the narrow pulse processing structure and a thyristor GCT, wherein a cathode of the thyristor GCT is connected to an input end of a current signal processing unit of the narrow pulse processing structure, and a turn-on module and a turn-off module, which are connected in parallel, are connected between a gate of the thyristor GCT and a logic processing module of the narrow pulse processing structure.
In this embodiment, the current signal conversion unit includes a detection module and a signal conditioning module, the detection module is configured to detect a current and convert the current into an analog signal, and the signal conditioning module is connected to the detection module and configured to convert the analog signal into a voltage signal. The detection module is a current sensor, and the signal conditioning module comprises an operational amplifier.
Based on the above, in step S1 of the narrow pulse processing method according to the embodiment of the present invention, specifically:
s11: the current sensor detects the currents of the anode and cathode of the thyristor device and converts the currents into weak analog signals;
s12: and converting the analog signal into a voltage signal with proper unipolar character through an operational amplifier of the signal conditioning module, and transmitting the voltage signal to the comparator module.
Preferably, the comparator module includes a plurality of operational amplifier comparison circuits, negative input pins of the operational amplifier comparison circuits are connected to voltages with different reference values, a positive input pin is connected to the current signal conversion unit, and an output pin is connected to the logic processing module. The voltage reference values accessed by the operational amplifier comparison circuits are gradually increased in sequence and are respectively corresponding to current reference values, the voltage signals output digital signals through the operational amplifier comparison circuits, and the logic processing module compares the digital signals with the current reference values to obtain corresponding current intervals.
In this embodiment, as shown in fig. 1, 6 operational amplifier comparison circuits are selected as S1, S2, S3, S4, S5, and S6, voltage reference values accessed to negative pins of the 6 operational amplifier comparison circuits are VOCP1, VOCP2, VOCP3, VOCP4, VOCP5, and VOCP6, values of VOCP1, VOCP2, VOCP3, VOCP4, VOCP5, and VOCP6 are gradually increased, corresponding current reference values are Iocp1, Iocp2, Iocp3, Iocp4, Iocp5, and Iocp6, and a digital signal is set to [ 6.. S1 ].
As shown in fig. 2, when the voltage signal V > VOCP6, the digital signal [ S6.. S1] ═ 111111 "; when VOCP5 < V ≦ VOCP6, [ S6.. S1] ═ 011111 "; when VOCP4 < V ≦ VOCP5, [ S6.. S1] ═ 001111 "; when VOCP3 < V ≦ VOCP4, [ S6.. S1] - "000111"; when VOCP2 < V ≦ VOCP3, [ S6.. S1] ═ 000011 "; when VOCP1 < V ≦ VOCP2, [ S6.. S1] ═ 000001 "; when V ≦ VOCP1, [ S6.. S1] ═ 000000.
As can be seen from the above, when the digital signal [ S6.. S1] "111111", the current I flowing through the corresponding thyristor device GCT is greater than Iocp 6; when [ S6.. S1] ═ 011111 ", Iocp5 < I ≦ Iocp 6; when [ S6.. S1] ═ 001111 ", Iocp4 < I ≦ Iocp 5; when [ S6.. S1] ═ 000111 ", Iocp3 < I ≦ Iocp 4; when [ S6.. S1] ═ 000011 ", Iocp2 < I ≦ Iocp 3; when [ S6.. S1] ═ 000001 ", Iocp1 < I ≦ Iocp 2; when [ S6.. S1] ═ 000000 ", I ≦ Iocp 1. Therefore, the current interval corresponding to the digital signal can be obtained through the logic processing module according to the output digital signal.
It should be noted that, in some other embodiments, a person skilled in the art may adjust the number of the operational amplifier comparison circuits and the magnitude of the voltage reference value to be connected according to actual needs.
Based on the above, in steps S2 and S3 of the narrow pulse processing method according to the embodiment of the present invention, specifically:
s31: comparing the voltage signal with a plurality of voltage reference values through an operational amplifier comparator, and outputting the digital signal;
s32: obtaining voltage reference values which are closest to two ends of the magnitude of the voltage signal value according to the digital signal;
s33: and obtaining two corresponding current reference values according to the voltage reference value to form a current interval.
The processing structure further comprises a driving board and a control board connected with the driving board, and the logic processing module is installed on the driving board. In this embodiment, the control board is a local control board (hereinafter referred to as a "floor"), the local control board is located near the drive board and communicates with the drive board through an optical fiber, and the local control board has a main function of sending a disconnection instruction to the drive board and a main function of processing a fault signal returned by a logic processing module in the drive board.
Before step S1 of the narrow pulse processing method according to the embodiment of the present invention, the method further includes the following steps:
s01: the logic processing module receives a turn-off instruction sent by the local board;
s02: and judging whether the current flowing through the device is in a narrow pulse stage or not. If the pulse is in the narrow pulse stage, performing the steps S1-S4; if the pulse is not in the narrow pulse stage, the drive plate is used for carrying out the turn-off operation.
Specifically, whether the device is in the narrow pulse phase is determined by the device on-time, and as shown in fig. 3, the device belongs to the narrow pulse phase before time t 2.
After step S4 of the narrow pulse processing method according to the embodiment of the present invention, the method further includes the following steps:
s51: if the current interval is judged to be smaller than the safe turn-off current, controlling a turn-off module to perform turn-off operation through a drive plate;
s52: and if the current interval is judged to be larger than or equal to the safe turn-off current, delaying to wait for the current flowing through the device to enter the safe turn-off current and then carrying out turn-off operation.
With reference to the logic diagram of the shutdown processing shown in fig. 3, the principle is as follows: the solid line filling area is the safe turn-off current range of the device, the dotted line is the actual flowing current of the device, wherein t 0-t 2 are narrow pulse stages. When the device receives a turn-off command in a time period from t0 to t1, the device cannot be turned off immediately because the actual current of the device is smaller than the safe turn-off current at the moment, and the device can be turned off after the time is delayed to t 1; when the device receives a turn-off instruction in a time period from t1 to t2, the device can be turned off because the actual current of the device is greater than the safe turn-off current; when the device receives a turn-off command in a period after t2, the device is immediately turned off since it is not in the narrow pulse phase at this time.
By the scheme, the local board does not need to process the narrow pulse, so that the software overhead of the local board is reduced, and the application range of the driving board is widened; under the condition of a fault, the drive board can be prevented from being influenced by narrow pulses to the maximum extent and is turned off in time, and the failure probability of the thyristor GCT is reduced.
It should be noted that, in the technical solution of the present invention, the steps are denoted by S1, S2, and S3
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A narrow pulse processing architecture, comprising:
a current signal conversion unit for converting a current detected in the device into a voltage signal;
the comparator module is connected with the current signal conversion unit, compares the voltage value of the voltage signal with a voltage reference value and outputs a corresponding digital signal according to a comparison result; and
and the logic processing module is connected with the comparator module, acquires a current interval corresponding to the current according to the digital signal and judges whether the current interval is smaller than the safe turn-off current or not.
2. The narrow pulse processing architecture of claim 1, wherein said current signal converting unit comprises:
the detection module is used for detecting current and converting the current into an analog signal;
and the signal conditioning module is connected with the detection module and used for converting the analog signal into the voltage signal.
3. The narrow pulse processing architecture as defined in claim 2, wherein said detection module is a current sensor.
4. The narrow pulse processing architecture defined in claim 2 wherein the signal conditioning module comprises an operational amplifier.
5. The narrow pulse processing architecture of claim 1, wherein the comparator module comprises a plurality of operational amplifier comparison circuits, and negative input pins of the operational amplifier comparison circuits are connected to voltages with different reference values, a positive input pin is connected to the current signal conversion unit, and an output pin is connected to the logic processing module.
6. The narrow pulse processing architecture of claim 5, wherein voltage reference values accessed by a plurality of operational amplifier comparison circuits are sequentially and gradually increased and respectively correspond to current reference values, the voltage signals output digital signals through the plurality of operational amplifier comparison circuits, and the logic processing module obtains corresponding current intervals according to the digital signals comparing the current reference values.
7. The narrow pulse processing architecture defined in claim 1, wherein said processing architecture further comprises a driver board and a control board connected to said driver board, said logic processing module being mounted to said driver board.
8. A shutdown circuit, comprising:
the narrow pulse processing structure of any one of claims 1-7; and
the cathode of the thyristor is connected with the input end of the current signal processing unit of the narrow pulse processing structure, and a switching-on module and a switching-off module which are arranged in parallel are connected between the gate pole of the thyristor and the logic processing module of the narrow pulse processing structure.
9. A method of narrow pulse processing, comprising the steps of:
converting the current detected in the device into a voltage signal;
comparing the voltage value of the voltage signal with a voltage reference value by using a comparison circuit, and outputting a corresponding digital signal according to a comparison result;
obtaining a current interval corresponding to the current according to the digital signal;
and judging whether the current interval is smaller than the safe turn-off current or not.
10. The narrow pulse processing method according to claim 9, wherein in the step of converting the current detected in the device into a voltage signal, specifically:
detecting a current and converting the current into an analog signal;
converting the analog signal to a voltage signal.
11. The method according to claim 9, wherein the comparing circuits are plural in number and correspond to plural voltage reference values with gradually increasing values, the plural voltage reference values respectively correspond to current reference values, and the plural current reference values with gradually increasing values form plural current intervals;
in the step of outputting the digital signal and obtaining the current interval, the method specifically comprises the following steps:
comparing the voltage signals with a plurality of comparison circuits and outputting the digital signals;
obtaining voltage reference values which are closest to two ends of the magnitude of the voltage signal value according to the digital signal;
and obtaining two corresponding current reference values according to the voltage reference value to form a current interval.
12. The narrow pulse processing method according to claim 9,
if the current interval is judged to be smaller than the safe turn-off current, turning off operation is carried out;
and if the current interval is judged to be larger than or equal to the safe turn-off current, delaying to wait for the current flowing through the device to enter the safe turn-off current and then carrying out turn-off operation.
13. The narrow pulse processing method according to claim 9, further comprising, before the step of converting the current detected in the device into a voltage signal, the steps of:
the logic processing module receives a turn-off instruction sent by the control panel;
judging whether the current of the current device is in a narrow pulse stage;
if the pulse is in the narrow pulse stage, voltage signal conversion is carried out;
and if the pulse is not in the narrow pulse stage, performing turn-off operation.
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| CN202110657587.3A CN113472336A (en) | 2021-06-13 | 2021-06-13 | Narrow pulse processing structure and processing method thereof |
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