CN109444522B - Lightning stroke detection trigger circuit - Google Patents
Lightning stroke detection trigger circuit Download PDFInfo
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- CN109444522B CN109444522B CN201811610695.XA CN201811610695A CN109444522B CN 109444522 B CN109444522 B CN 109444522B CN 201811610695 A CN201811610695 A CN 201811610695A CN 109444522 B CN109444522 B CN 109444522B
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- 238000001514 detection method Methods 0.000 title claims abstract description 164
- 208000025274 Lightning injury Diseases 0.000 title claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 181
- 238000012545 processing Methods 0.000 claims description 41
- 230000009471 action Effects 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 18
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- 238000001914 filtration Methods 0.000 claims description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
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Abstract
The invention relates to a lightning stroke detection trigger circuit, comprising: the lightning strike protection circuit comprises a sampling circuit, a positive polarity lightning strike trigger circuit and a negative polarity lightning strike trigger circuit; the sampling circuit is respectively connected with the input end of the positive polarity lightning strike trigger circuit and the input end of the negative polarity lightning strike trigger circuit; the sampling circuit is used for receiving the lightning current signal and outputting a first sampling signal to the positive polarity lightning trigger circuit and the negative polarity lightning trigger circuit according to the lightning current signal; the output end of the positive polarity lightning strike trigger circuit is used for being connected with a lightning strike current detection device. According to the lightning current detection device, the lightning current detection device can be triggered aiming at lightning currents with different polarities, and the lightning currents with two polarities can be covered, so that the lightning current is monitored more comprehensively.
Description
Technical Field
The invention relates to the technical field of lightning detection, in particular to a lightning stroke detection trigger circuit.
Background
When lightning occurs, larger lightning stroke current can be generated, power equipment can be damaged, in order to reduce loss caused by the lightning, besides the lightning protection device is required to protect, the lightning is required to be monitored generally, the characteristics and the activity rule of the lightning and the lightning stroke weak points of a power grid are analyzed through monitoring results, more effective lightning protection measures are selected according to analysis, and a more perfect lightning protection device is established.
However, the generation of lightning has uncertainty, so that in order to ensure the integrity of a monitoring result, the monitoring equipment needs to be in a working state for a long time, and the energy consumption is high.
Disclosure of Invention
Based on this, it is necessary to provide a lightning strike detection trigger circuit capable of comprehensively monitoring lightning current.
A lightning strike detection trigger circuit, comprising: the lightning strike protection circuit comprises a sampling circuit, a positive polarity lightning strike trigger circuit and a negative polarity lightning strike trigger circuit; the sampling circuit is respectively connected with the input end of the positive polarity lightning strike trigger circuit and the input end of the negative polarity lightning strike trigger circuit; the sampling circuit is used for receiving the lightning current signal, outputting a first sampling signal to the positive polarity lightning trigger circuit and the negative polarity lightning trigger circuit according to the lightning current signal, wherein the first sampling signal is a positive polarity sampling signal when the lightning current signal is a positive polarity lightning current signal, and is a negative polarity sampling signal when the lightning current signal is a negative polarity lightning current signal; the output end of the positive polarity lightning strike trigger circuit is used for connecting a lightning strike current detection device; the positive polarity lightning stroke trigger circuit is used for conducting when the first sampling signal is a positive polarity sampling signal and outputting a positive polarity trigger signal to the lightning stroke current detection device; the output ends of the negative polarity lightning strike trigger circuits are all used for connecting a lightning strike current detection device; and the negative polarity lightning strike trigger circuit is used for being conducted when the first sampling signal is a negative polarity sampling signal and outputting a negative polarity trigger signal to the lightning strike current detection device.
In one embodiment, the sampling circuit includes a current signal receiving unit and a sampling unit; the current signal receiving unit is connected with the sampling unit and is used for receiving the lightning current signal and outputting the lightning current signal to the sampling unit; the sampling unit is connected with the input end of the positive polarity lightning stroke trigger circuit and the input end of the negative polarity lightning stroke trigger circuit and is used for converting lightning stroke current signals into first sampling signals which are output to the positive polarity lightning stroke trigger circuit and the negative polarity lightning stroke trigger circuit.
In one embodiment, a positive polarity lightning strike trigger circuit includes: a first edge capturing unit and a first switching unit; the input end of the first edge capturing unit is connected with the sampling unit, the output end of the first edge capturing unit is connected with the first switch unit, and the first edge capturing unit is used for outputting a positive polarity action signal to the first switch unit when capturing a first rising edge signal of a positive polarity sampling signal; the output end of the first switch unit is used for being connected with the lightning current detection device, acts after receiving the positive polarity action signal, and outputs a positive polarity trigger signal to the lightning current detection device.
In one embodiment, a negative polarity lightning strike trigger circuit includes: a second edge capturing unit and a second switching unit; the input end of the second edge capturing unit is connected with the sampling unit, the output end of the second edge capturing unit is connected with the second switching unit, and the second edge capturing unit is used for outputting a negative polarity action signal to the second switching unit when capturing a first falling edge signal of a negative polarity sampling signal; the output end of the second switch unit is used for being connected with the lightning current detection device, acts after receiving the negative polarity action signal, and outputs a negative polarity trigger signal to the lightning current detection device.
In one embodiment, the lightning strike detection trigger circuit further comprises: a current detection circuit and a processing unit; the current signal receiving unit is also used for receiving leakage current signals generated by the lightning overvoltage protection device and outputting the leakage current signals to the sampling unit; the sampling unit is also used for converting the leakage current signal into a second sampling signal, and outputting the second sampling signal to the current detection circuit, wherein the second sampling signal is a voltage signal; the input end of the current detection circuit is connected with the sampling unit, the output end of the current detection circuit is connected with the processing unit and is used for receiving the second sampling signal, amplifying the second sampling signal and then outputting a detection signal to the processing unit; the processing unit is used for processing the detection signal to obtain a detection result of the leakage current signal.
In one embodiment, the current detection circuit comprises a first detection circuit and a second detection circuit which are respectively used for detecting leakage current signals in different range ranges; the input end of the first detection circuit is connected with the sampling unit, and the output end of the first detection circuit is connected with the processing unit; the input end of the second detection circuit is connected with the sampling unit, and the output end of the second detection circuit is connected with the processing unit.
In one embodiment, the current signal receiving unit includes: the secondary side of the current sensor is connected with the sampling unit in parallel, and the primary side of the current sensor is used for receiving lightning current signals and leakage current signals.
In one embodiment, the current sensor is a low reluctance current sensor.
In one embodiment, the first switching unit includes: an NPN triode; the base electrode of the NPN triode is connected with the output end of the first edge capturing unit, the emitter electrode is grounded, and the collector electrode is used for being connected with a power supply and a lightning stroke current detection device.
In one embodiment, the second switching unit includes: a PNP triode; the base electrode of the PNP triode is connected with the output end of the second edge capturing unit, the emitter electrode is connected with a power supply, and the collector electrode is used for being connected with the lightning current detection device and the grounding.
Above-mentioned trigger circuit utilizes sampling circuit to sample the thunderbolt electric current, triggers thunderbolt electric current detection device through positive polarity thunderbolt trigger circuit and negative polarity thunderbolt trigger circuit respectively to the thunderbolt electric current of different polarity, can trigger again when producing the thunderbolt and detect thunderbolt electric current detection device, reduces the energy consumption to can cover the thunderbolt electric current of two polarities, make more comprehensive to the monitoring of thunderbolt electric current.
Drawings
FIG. 1 is a schematic diagram of a trigger circuit in one embodiment;
FIG. 2 is a schematic diagram of a trigger circuit and its internal components in one embodiment;
FIG. 3 is a schematic diagram of a trigger circuit according to another embodiment;
FIG. 4 is a schematic diagram of a circuit configuration of a trigger circuit in one embodiment;
fig. 5 is a schematic circuit diagram of a trigger circuit according to another embodiment.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In a specific embodiment, a lightning strike detection trigger circuit, as shown in FIG. 1, includes: sampling circuit 100, positive polarity lightning strike trigger circuit 200, and negative polarity lightning strike trigger circuit 300; the sampling circuit 100 is connected with the input end of the positive polarity lightning strike trigger circuit 200 and the input end of the negative polarity lightning strike trigger circuit 300 respectively; the sampling circuit 100 is configured to receive a lightning current signal, output a first sampling signal to the positive polarity lightning trigger circuit 200 and the negative polarity lightning trigger circuit 300 according to the lightning current signal, wherein the first sampling signal is a positive polarity sampling signal when the lightning current signal is a positive polarity lightning current signal, and the first sampling signal is a negative polarity sampling signal when the lightning current signal is a negative polarity lightning current signal; the output end of the positive polarity lightning strike trigger circuit 200 is used for connecting a lightning strike current detection device; the positive polarity lightning strike trigger circuit 200 is used for conducting when the first sampling signal is a positive polarity sampling signal, and outputting a positive polarity trigger signal to the lightning strike current detection device; the output ends of the negative polarity lightning strike trigger circuit 300 are all used for connecting a lightning strike current detection device; the negative polarity lightning strike trigger circuit 300 is used for being conducted when the first sampling signal is a negative polarity sampling signal, and outputting a negative polarity trigger signal to the lightning strike current detection device.
The lightning strike current signal generated by the lightning strike may be a positive polarity lightning strike current signal or a negative polarity lightning strike current signal, after the sampling circuit 100 receives the lightning strike current signal, the lightning strike current signal is converted into a voltage signal and is output to the positive polarity lightning strike trigger circuit 200 as a first sampling signal, and the negative polarity lightning strike trigger circuit 300, when the lightning strike current signal is the positive polarity lightning strike current signal, the sampling circuit 100 outputs the positive polarity sampling signal, the negative polarity lightning strike trigger circuit 300 is not conducted, the positive polarity lightning strike trigger circuit 200 is conducted, and the positive polarity trigger signal V1 is output to the lightning strike current detection device to trigger the lightning strike current detection device to detect the positive polarity lightning strike current signal, and the lightning strike current detection device may include a single chip microcomputer with a current detection function in some embodiments, and may also include a current detection circuit; when the lightning current signal is a lightning current signal with negative polarity, the sampling circuit 100 outputs a sampling signal with negative polarity, the lightning trigger circuit 200 with positive polarity is not conducted, the lightning trigger circuit 300 with negative polarity is conducted, and the lightning trigger signal V2 with negative polarity is output to the lightning current detection device to trigger the lightning current detection device to detect the lightning current signal with negative polarity.
The trigger circuit disclosed by the invention can be suitable for lightning strike current with two polarities, the lightning strike current detection device is indirectly triggered after the sampling signal is used for conducting the positive polarity lightning strike trigger circuit 200 or the negative polarity lightning strike trigger circuit 300 by sampling the received lightning strike current signal, the triggering reliability is ensured, and the circuit is prevented from being damaged due to overlarge lightning strike current signal.
In one embodiment, as shown in fig. 2, the sampling circuit 100 includes a current signal receiving unit 110 and a sampling unit 120; the current signal receiving unit 110 is connected with the sampling unit 120, and is used for receiving lightning current signals and outputting the lightning current signals to the sampling unit 120; the sampling unit 120 is connected to the input end of the positive polarity lightning strike trigger circuit 200 and the input end of the negative polarity lightning strike trigger circuit 300, and is configured to convert the lightning strike current signal into a first sampling signal, and output the first sampling signal to the positive polarity lightning strike trigger circuit 200 and the negative polarity lightning strike trigger circuit 300, where the first sampling signal is a voltage signal.
The current signal receiving unit 110 is configured to receive the lightning current signal and output the lightning current signal to the sampling unit 120, and the sampling unit 120 is configured to convert the received lightning current signal into a voltage signal as a first sampling signal and output the voltage signal to the positive polarity lightning triggering circuit 200 and the negative polarity lightning triggering circuit 300. Compared with directly outputting the lightning current signal to the measurement circuit for triggering, the current signal receiving unit 110 can ensure that the sampling unit 120 can output the first sampling signal for triggering as long as the lightning current signal is received, so that the detection result of the lightning current signal can be obtained as completely as possible.
In one embodiment, as shown in FIG. 2, a positive polarity lightning strike trigger circuit 200 includes: a first edge capturing unit 210 and a first switching unit 220; the input end of the first edge capturing unit 210 is connected to the sampling unit 120, and the output end is connected to the first switching unit 220, for outputting a positive polarity operation signal to the first switching unit 220 when capturing a first rising edge signal of the positive polarity sampling signal; the output end of the first switch unit 220 is used for connecting with a lightning current detection device, and acts after receiving the positive polarity action signal, and outputs a positive polarity trigger signal to the lightning current detection device.
Since the current signal generated by the lightning strike discharge is a signal with oscillation attenuation change, in order to ensure that the lightning strike current can be detected as completely as possible, the triggering is performed in an edge triggering manner, when the first sampling signal is a positive polarity sampling signal, the first rising edge signal of the positive polarity lightning strike signal is captured by the first edge capturing unit 210 as a positive polarity action signal, the subsequent oscillation attenuation signal is filtered, the positive polarity action signal is output to the first switching unit 220 for triggering, the first switching unit 220 is triggered after receiving the positive polarity action signal, the positive polarity trigger signal V1 is output to the lightning strike current detection device, the positive polarity lightning strike current is triggered after receiving the positive polarity trigger signal V1, and the positive polarity lightning strike current is detected, and when the first sampling signal is a negative polarity sampling signal, the first switching unit 220 is not triggered.
In one embodiment, as shown in FIG. 2, the negative polarity lightning strike trigger circuit 300 includes: a second edge capturing unit 310 and a second switching unit 320; the input end of the second edge capturing unit 310 is connected to the sampling unit 120, and the output end is connected to the second switching unit 320, so as to output a negative polarity action signal to the second switching unit 320 when capturing the first falling edge signal of the negative polarity sampling signal; the output end of the second switch unit 320 is used for connecting with the lightning current detection device, and acts after receiving the negative polarity action signal, and outputs a negative polarity trigger signal to the lightning current detection device.
When the first sampling signal is a negative polarity sampling signal, a first falling edge signal of the negative polarity lightning strike signal is captured by the second edge capturing unit 310 as a negative polarity action signal, a subsequent oscillation attenuation signal is filtered, the negative polarity action signal is output to the second switch unit 320 to trigger, the second switch unit 320 is triggered to act after receiving the negative polarity action signal, the negative polarity trigger signal V2 is output to the lightning strike current detection device, the lightning strike current detection device is triggered after receiving the negative polarity trigger signal V2, and the negative polarity lightning strike current is detected, and when the first sampling signal is a positive polarity sampling signal, the second switch unit 320 is not triggered to act.
In one embodiment, as shown in FIG. 3, the lightning strike detection trigger circuit further comprises: a current detection circuit 400 and a processing unit (not shown); the current signal receiving unit is also used for receiving leakage current signals generated by the lightning overvoltage protection device and outputting the leakage current signals to the sampling unit; the sampling unit is also used for converting the leakage current signal into a second sampling signal, and outputting the second sampling signal to the current detection circuit, wherein the second sampling signal is a voltage signal; the input end of the current detection circuit 400 is connected with the sampling unit 120, and the output end is connected with the processing unit, and is used for receiving the sampling signal, amplifying the second sampling signal and then outputting a detection signal to the processing unit; the processing unit is used for processing the detection signal to obtain a detection result of the leakage current signal.
The current signal receiving unit 110 is configured to receive, in addition to the lightning current signal, a leakage current generated by an overvoltage protection device in the lightning protection device, and output a detection current signal to the sampling unit 120 according to the received leakage current, where the sampling unit 120 converts the detection current signal into a voltage signal and then samples the voltage signal, and outputs a second sampling signal to the current detection circuit 400, and the current detection circuit 400 amplifies the second sampling signal and outputs the second sampling signal to the processing unit for processing, where the processing unit may be a single chip microcomputer or a computer device, and the processing unit outputs the sampling signal to the current detection circuit 400 when receiving the leakage current and the lightning current signal, and determines and distinguishes the detection signal output by the current detection circuit 400 through the processing unit, so as to obtain a detection result of the leakage current.
The invention can stably trigger the lightning stroke current detection device, monitor the overvoltage protection device when no lightning stroke is generated at ordinary times, and indicate that the overvoltage protection device is failed or damaged when the leakage current is larger than the threshold value, so that the maintenance or the replacement can be performed in time.
In one embodiment, as shown in fig. 5, the current detection circuit 400 includes a first detection circuit and a second detection circuit for detecting leakage current signals with different range ranges, respectively; the input end of the first detection circuit is connected with the sampling unit 120, and the output end of the first detection circuit is connected with the processing unit; the input end of the second detection circuit is connected with the sampling unit 120, and the output end of the second detection circuit is connected with the processing unit.
The first detection circuit and the second detection circuit which can detect currents in different measuring ranges are arranged according to the requirements, the measuring range of leakage current is enlarged, and in some embodiments, detection circuits with more measuring ranges can be arranged.
In one embodiment, the current signal receiving unit 110 includes: the current sensor, the secondary side of which is connected in parallel with the sampling unit 120, and the primary side of which is used for receiving lightning current signals and leakage current signals.
Because the lightning strike discharge current is generally larger, if the received lightning strike current signal is directly processed, a circuit or other equipment can be damaged, so that the lightning strike discharge current is received by using a current sensor, the primary side of the current sensor is used for receiving the lightning strike current signal and the leakage current of the overvoltage protection device, and the secondary side outputs the induction current according to the current received by the primary side and then processes the induction current to protect the circuit and other power equipment.
In one embodiment, the current sensor is a low reluctance current sensor.
The current sensor for receiving lightning current commonly used at present is a rogowski coil, the rogowski coil has the advantages of high current unsaturation and excellent high-frequency characteristic, but the change rate of the lightning current is extremely high, the edge is steep, the current can quickly rise to a peak value, the current duration is short, the lightning current detection device is directly awakened by the current output by the secondary side of the rogowski coil, partial current data or whole lightning current data of the lightning start can not be acquired, and compared with the rogowski coil, the low-reluctance current sensor is more sensitive and reliable, and the complete acquisition of the lightning current data can be realized.
In one embodiment, as shown in fig. 4 and 5, the first switching unit 220 includes: NPN triode Q1; the base of NPN triode Q1 is connected to the output of first edge capture unit 210, the emitter is grounded, and the collector is connected to power supply VCC and lightning current detection device.
The first switch unit 220 is configured to operate when the sampling signal is a positive polarity lightning strike signal, and perform switch control through the NPN triode Q1, the first edge capturing unit 210 outputs a positive polarity operating signal to the base, the NPN triode Q1 is turned on, and the collector outputs a positive polarity trigger signal V1 to the lightning strike current detection device.
In one embodiment, as shown in fig. 4 and 5, the second switching unit 320 includes: PNP transistor Q2; the base of PNP triode Q2 is connected with the output end of second edge capturing unit 310, the emitter is connected with power VCC, and the collector is used for connecting lightning current detection device and grounding.
The second switch unit 320 is configured to operate when the sampling signal is a negative polarity lightning strike signal, and perform switch control through the PNP transistor Q2, the second edge capture unit 310 outputs a negative polarity operating signal to the base, the PNP transistor Q2 is turned on, and the collector outputs a negative polarity trigger signal V2 to the lightning strike current detection device.
In one embodiment, the principles of the present invention are described in detail in connection with FIG. 5:
the primary side of the current transformer T is used for receiving lightning strike discharge current and leakage current of an overvoltage protection device, the transient voltage suppression protection diode D5 is used for protecting a circuit to prevent components or circuits from being damaged due to overlarge current, the sampling unit 120 comprises a sampling resistor R8, when the primary side of the current transformer T receives positive polarity lightning strike discharge current signals, the secondary side outputs positive polarity lightning strike signals to the sampling resistor R8, the sampling resistor R8 converts the positive polarity lightning strike signals into sampling signals and simultaneously outputs the sampling signals to a positive polarity lightning strike trigger circuit, a negative polarity lightning strike trigger circuit and a current detection circuit, the first end of the sampling resistor R8 is respectively connected with the positive polarity lightning strike trigger circuit, the negative polarity lightning strike trigger circuit and the current detection circuit, the second end of the sampling resistor R8 is grounded, the sampling signals of the positive polarity lightning strike signals are also positive polarity, the lightning strike trigger circuit does not act, the current detection circuit detects the sampling signals and outputs the positive polarity lightning strike discharge current signals to the processing device to select, and the processing device judges that the detection results do not belong to the leakage current of the overvoltage protection device; the first edge capturing unit 210 of the positive polarity lightning strike trigger circuit comprises a capacitor C1 and a resistor R1, filters a sampling signal, captures a first rising edge signal as a positive polarity action signal and outputs the positive polarity action signal to a base electrode of an NPN triode Q1 in the first switch unit 220, an emitter electrode of the NPN triode Q1 is grounded, a collector electrode is connected with a power supply VCC through a resistor R2, a diode D1 is connected between the base electrode and the emitter electrode, an anode of the diode D1 is connected with the emitter electrode, a cathode is connected with the base electrode and is used for protecting the NPN triode Q1 from reverse high voltage breakdown, a collector electrode of the NPN triode Q1 is connected with a lightning strike current detection device through a resistor R3, a diode D2 and a capacitor C2 are further arranged for protection and filtering, an anode of the diode D2 is grounded, a cathode is connected with the emitter electrode, a first end of the resistor R3 is connected with the emitter electrode, a second end of the capacitor C2 is connected with a second end of the resistor R3, and a second end of the capacitor C2 is grounded; the NPN triode Q1 is conducted after receiving the positive polarity action signal, and outputs a positive polarity trigger signal V1 to the lightning stroke current detection device.
When a primary side of the current transformer T receives a negative-polarity lightning strike discharge current signal, a secondary side outputs a negative-polarity lightning strike signal to a sampling resistor R8, the sampling resistor R8 converts the negative-polarity lightning strike signal into a sampling signal and outputs the sampling signal to a negative-polarity lightning strike trigger circuit, a positive-polarity lightning strike trigger circuit and a current detection circuit simultaneously, a first end of the sampling resistor R8 is respectively connected with the positive-polarity lightning strike trigger circuit, the negative-polarity lightning strike trigger circuit and the current detection circuit, a second end of the sampling resistor R8 is grounded, and the sampling signal of the negative-polarity lightning strike signal is also negative, so that the positive-polarity lightning strike trigger circuit does not act, the current detection circuit detects the sampling signal and outputs the sampling signal to a processing device for selection, and the processing device judges that the detection result does not belong to leakage current of the overvoltage protection device; the second edge capturing unit 310 of the negative polarity lightning strike trigger circuit comprises a capacitor C3 and a resistor R4, the sampling signal is filtered, the first falling edge signal is captured and output to a base electrode of a PNP triode Q2 in the second switch unit 320 as a negative polarity action signal, an emitter electrode of the PNP triode Q2 is connected with a power supply VCC, the collector electrode is grounded through the resistor R6, a diode D3 and a resistor R5 which are connected in parallel are connected between the base electrode and the emitter electrode, an anode of the diode D3 is connected with the base electrode, a cathode is connected with the emitter electrode, the resistor R5 is connected with two ends of the diode D3 in parallel and is commonly used for protecting the PNP triode Q2 from being broken down by reverse high voltage, a collector electrode of the PNP triode Q2 is connected with a lightning strike current detection device through the resistor R7, the diode D4 and the capacitor C4 are further arranged for protection and filtering, the anode of the diode D4 is grounded, a first end of the resistor R7 is connected with the collector electrode, a second end of the resistor R4 is connected with the lightning strike current detection device, and a second end of the capacitor C4 is grounded; the PNP triode Q2 is conducted after receiving the negative polarity action signal, and outputs a negative polarity trigger signal V2 to the lightning stroke current detection device.
When the primary side of the current transformer T receives leakage current of the overvoltage protection device, the secondary side outputs detection current signals to a sampling resistor R8, the sampling resistor R8 converts the detection current signals into sampling signals and outputs the sampling signals to a current detection circuit, a negative polarity lightning strike trigger circuit and a positive polarity lightning strike trigger circuit simultaneously, the first end of the sampling resistor R8 is respectively connected with the positive polarity lightning strike trigger circuit, the negative polarity lightning strike trigger circuit and the current detection circuit, and the second end is grounded, and because the sampling signals of the detection current signals are generally smaller, the conduction conditions for triggering the positive polarity lightning strike trigger circuit and the negative polarity lightning strike trigger circuit are not met, the positive polarity lightning strike trigger circuit and the negative polarity lightning strike trigger circuit do not act, the current detection circuit detects the sampling signals and outputs the sampling signals to a processing device for selection, and the processing device judges that the detection results belong to the leakage current of the overvoltage protection device and records or carries out other processing on the detection results; the current detection circuit comprises a protection unit, a first detection circuit and a second detection circuit, wherein the protection unit comprises a resistor R9, a diode D6 and a capacitor C5, the first end of the resistor R9 is connected with the first end of a sampling resistor R8, the second end of the resistor R9 is respectively connected with the first detection circuit and the second detection circuit, the cathode of the diode D6 is connected with the second end of the resistor R9, the anode is grounded, and the first end of the capacitor C5 is connected with the second end of the resistor R9 and the second end is grounded; the first detection circuit is used for measuring large current, the second detection circuit is used for measuring small current, a first end of a resistor R11 in the first detection circuit is connected with a second end of a resistor R9, the second end of the resistor R11 is connected with a positive input end of the amplifier, a negative input end of the amplifier is grounded through a resistor R10, a first end of a resistor R12 is connected with a negative input end of the amplifier, the second end of the resistor R12 is connected with an output end of the amplifier, an output end of the amplifier is connected with a processing device through a resistor R14, and one end of the resistor R14, which is used for being connected with the processing device, is grounded through a capacitor C6; and the processing device is used for amplifying the received heavy current and outputting a detection result V3 to the processing device. The first end of a resistor R16 in the second detection circuit is connected with the second end of a resistor R9, the second end of the resistor R16 is connected with the positive electrode input end of the amplifier, the negative electrode input end of the amplifier is grounded through a resistor R15, the first end of a resistor R17 is connected with the negative electrode input end of the amplifier, the second end of the resistor R17 is connected with the output end of the amplifier, the output end of the amplifier is connected with the processing device through a resistor R18, and one end of the resistor 18 used for being connected with the processing device is grounded through a capacitor C7; and the processing device is used for amplifying the received small current and outputting a detection result V4 to the processing device.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A lightning strike detection trigger circuit, comprising: the lightning strike protection circuit comprises a sampling circuit, a positive polarity lightning strike trigger circuit and a negative polarity lightning strike trigger circuit;
the sampling circuit is respectively connected with the input end of the positive polarity lightning strike trigger circuit and the input end of the negative polarity lightning strike trigger circuit; the sampling circuit is used for receiving a lightning stroke current signal, outputting a first sampling signal to the positive polarity lightning stroke trigger circuit and the negative polarity lightning stroke trigger circuit according to the lightning stroke current signal, wherein the first sampling signal is a positive polarity sampling signal when the lightning stroke current signal is a positive polarity lightning stroke current signal, and the first sampling signal is a negative polarity sampling signal when the lightning stroke current signal is a negative polarity lightning stroke current signal;
the output end of the positive polarity lightning strike trigger circuit is used for being connected with a lightning strike current detection device; the positive polarity lightning stroke trigger circuit is used for being conducted when the first sampling signal is a positive polarity sampling signal, and outputting a positive polarity trigger signal to the lightning stroke current detection device; the positive polarity trigger signal is obtained from a first rising edge signal of the positive polarity sampling signal;
the output ends of the negative polarity lightning strike trigger circuits are all used for being connected with a lightning strike current detection device; the negative lightning strike trigger circuit is used for being conducted when the first sampling signal is a negative sampling signal and outputting a negative trigger signal to the lightning strike current detection device; the negative polarity trigger signal is obtained from a first falling edge signal of the negative polarity sampling signal;
the sampling circuit comprises a current transformer T and a sampling resistor R8; when the primary side of the current transformer T receives a positive polarity lightning strike discharge current signal, the secondary side outputs a positive polarity lightning strike signal to a sampling resistor R8, the sampling resistor R8 converts the positive polarity lightning strike signal into a sampling signal, and the sampling signal is simultaneously output to a positive polarity lightning strike trigger circuit, a negative polarity lightning strike trigger circuit and a current detection circuit;
the first end of the sampling resistor R8 is respectively connected with the positive polarity lightning strike trigger circuit, the negative polarity lightning strike trigger circuit and the current detection circuit, and the second end is grounded;
the positive polarity lightning strike trigger circuit comprises a first edge capturing unit and a first switch unit, wherein the first edge capturing unit comprises a capacitor C1 and a resistor R1, a sampling signal is filtered, a first rising edge signal is captured and used as a positive polarity action signal to be output to a base electrode of an NPN triode Q1 in the first switch unit, an emitter electrode of the NPN triode Q1 is grounded, a collector electrode is connected with a power supply VCC through a resistor R2, a diode D1 is connected between the base electrode and the emitter electrode, an anode of the diode D1 is connected with the emitter electrode, a cathode of the diode D1 is connected with the base electrode and used for protecting the NPN triode Q1 from being broken down by reverse high voltage, a collector electrode of the NPN triode Q1 is connected with a lightning strike current detection device through a resistor R3, a diode D2 and the capacitor C2 are also arranged for protection and filtering, an anode of the diode D2 is grounded, a cathode of the diode R3 is connected with the emitter electrode, a first end of the resistor R3 is connected with the lightning strike current detection device, and a second end of the capacitor C2 is connected with a second end of the resistor R3; the NPN triode Q1 is conducted after receiving the positive polarity action signal, and outputs a positive polarity trigger signal V1 to the lightning stroke current detection device;
when the primary side of the current transformer T receives a negative polarity lightning strike discharge current signal, the secondary side outputs a negative polarity lightning strike signal to the sampling resistor R8, the sampling resistor R8 converts the negative polarity lightning strike signal into a sampling signal, and the sampling signal is simultaneously output to a negative polarity lightning strike trigger circuit, a positive polarity lightning strike trigger circuit and a current detection circuit,
the negative polarity lightning strike trigger circuit comprises a second edge capturing unit and a second switch unit; the second edge capturing unit comprises a capacitor C3 and a resistor R4, the sampling signal is filtered, the first falling edge signal is captured and output to a base electrode of a PNP triode Q2 in the second switching unit as a negative polarity action signal, an emitter electrode of the PNP triode Q2 is connected with a power VCC, the collector electrode is grounded through a resistor R6, a diode D3 and a resistor R5 which are connected in parallel are connected between the base electrode and the emitter electrode, an anode of the diode D3 is connected with the base electrode, a cathode is connected with the emitter electrode, the resistor R5 is connected with two ends of the diode D3 in parallel and is used for protecting the PNP triode Q2 from being broken down by reverse high voltage, a collector electrode of the PNP triode Q2 is connected with a lightning stroke current detection device through a resistor R7, the diode D4 and the capacitor C4 are also arranged for protection and filtering, the anode of the diode D4 is grounded, a first end of the resistor R7 is connected with the collector electrode, a second end of the capacitor C4 is connected with the lightning stroke current detection device, and a first end of the capacitor C4 is connected with a second end of the resistor R7; the PNP triode Q2 is conducted after receiving the negative polarity action signal, and outputs a negative polarity trigger signal V2 to the lightning stroke current detection device.
2. The lightning strike detection trigger circuit of claim 1, wherein the sampling circuit comprises a current signal receiving unit and a sampling unit;
the current signal receiving unit is connected with the sampling unit and is used for receiving the lightning current signal and outputting the lightning current signal to the sampling unit;
the sampling unit is connected with the input end of the positive polarity lightning strike trigger circuit and the input end of the negative polarity lightning strike trigger circuit, and is used for converting the lightning strike current signal into a first sampling signal, outputting the first sampling signal to the positive polarity lightning strike trigger circuit and the negative polarity lightning strike trigger circuit, wherein the first sampling signal is a voltage signal.
3. The lightning strike detection trigger circuit of claim 2, wherein the positive polarity lightning strike trigger circuit comprises: a first edge capturing unit and a first switching unit;
the input end of the first edge capturing unit is connected with the sampling unit, the output end of the first edge capturing unit is connected with the first switch unit, and the first edge capturing unit is used for outputting a positive polarity action signal to the first switch unit when capturing a first rising edge signal of the positive polarity sampling signal;
the output end of the first switch unit is used for being connected with the lightning stroke current detection device, acts after receiving the positive polarity action signal, and outputs a positive polarity trigger signal to the lightning stroke current detection device.
4. The lightning strike detection trigger circuit of claim 3 wherein the negative polarity lightning strike trigger circuit comprises: a second edge capturing unit and a second switching unit;
the input end of the second edge capturing unit is connected with the sampling unit, the output end of the second edge capturing unit is connected with the second switch unit, and the second edge capturing unit is used for outputting a negative polarity action signal to the second switch unit when capturing a first falling edge signal of the negative polarity sampling signal;
the output end of the second switch unit is used for being connected with the lightning current detection device, acts after receiving the negative polarity action signal, and outputs a negative polarity trigger signal to the lightning current detection device.
5. The lightning strike detection trigger circuit of claim 4, further comprising: a current detection circuit and a processing unit;
the current signal receiving unit is also used for receiving leakage current signals generated by the lightning overvoltage protection device and outputting the leakage current signals to the sampling unit;
the sampling unit is also used for converting the leakage current signal into a second sampling signal, and outputting the second sampling signal to the current detection circuit, wherein the second sampling signal is a voltage signal;
the input end of the current detection circuit is connected with the sampling unit, the output end of the current detection circuit is connected with the processing unit and is used for receiving the second sampling signal, amplifying the second sampling signal and then outputting a detection signal to the processing unit;
the processing unit is used for processing the detection signal to obtain a detection result of the leakage current signal.
6. The lightning strike detection trigger circuit of claim 5, wherein the current detection circuit comprises a first detection circuit and a second detection circuit for detecting different range leakage current signals, respectively;
the input end of the first detection circuit is connected with the sampling unit, and the output end of the first detection circuit is connected with the processing unit;
and the input end of the second detection circuit is connected with the sampling unit, and the output end of the second detection circuit is connected with the processing unit.
7. The lightning strike detection trigger circuit of claim 5, wherein the current signal receiving unit comprises: the current sensor is provided with a sensor for detecting the current,
the secondary side of the current sensor is connected with the sampling unit in parallel, and the primary side of the current sensor is used for receiving the lightning stroke current signal and the leakage current signal.
8. The lightning strike detection trigger circuit of claim 7, wherein the current sensor is a low reluctance current sensor.
9. The lightning strike detection trigger circuit of any one of claims 3 to 8, wherein the first switching unit comprises: an NPN triode;
and the base electrode of the NPN triode is connected with the output end of the first edge capturing unit, the emitter electrode is grounded, and the collector electrode is used for connecting a power supply and the lightning stroke current detection device.
10. The lightning strike detection trigger circuit according to any one of claims 4 to 8, wherein the second switching unit includes: a PNP triode;
and the base electrode of the PNP triode is connected with the output end of the second edge capturing unit, the emitter electrode of the PNP triode is connected with the power supply, and the collector electrode of the PNP triode is used for connecting the lightning current detection device and the grounding.
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