Trigger pulse circuit and system

Abstract

The invention discloses a trigger pulse circuit and system, and relates to the field of measurement, and a time-delay controllable trigger circuit arranged in the trigger pulse circuit can convert a received CMOS level trigger signal into a CMOS level trigger pulse signal which can be recognized by a neutron generator high-voltage circuit when a first preset time after power-on is reached. And the neutron generator high-voltage circuit generates a neutron targeting pulse signal after receiving the CMOS level trigger pulse signal and transmits the neutron targeting pulse signal to the neutron tube, so that the neutron targeting operation can be carried out only when the storage type logging instrument is electrified for a first preset time. Neutron targeting caused by abnormal work of the storage type PNN logging instrument on the ground can be prevented, personal injury is completely eradicated, and the safety of the scheme is improved.

Description

Technical Field

[0001] This invention relates to the field of measurement, and in particular to a trigger pulse circuit and system. Background Technology

[0002] PNN (Pulse Neutron-Neutron) logging tools are saturation logging instruments used in oilfield production and development. PNN instruments work by emitting high-energy fast neutrons (14.1 MeV) into the formation and detecting the thermal neutrons that have been slowed down by the formation and are not yet trapped. This method can provide more accurate measurements even in formations with low salinity and low porosity.

[0003] When logging is required using a storage-type PNN logging tool, since the storage-type PNN logging tool is battery powered, the logging working mode needs to be set on the surface. Under normal circumstances, after the storage-type PNN logging tool is delivered to the bottom of the well, after the set time has elapsed, the storage segment in the storage-type PNN logging tool sends a trigger pulse to the neutron generator, and the neutron target circuit starts to work.

[0004] Neutron sources pose a significant radiation hazard to the human body. While storage-type PNN logging tools utilize controlled neutron sources and do not produce neutrons unless a target is triggered, once the battery is connected and the operating mode is set on the surface, the instrument begins operation. At this point, the instrument's operational status is unknown and cannot be directly observed. However, various unpredictable factors (such as accidental settings errors, misoperation, or instrument malfunctions) can accidentally trigger a neutron target trigger (emitting high-energy fast neutrons), causing irreparable and severe radiation damage to on-site personnel. Currently, there is an urgent need for a method that ensures the normal operation of the storage-type PNN logging tool while preventing neutron target triggering caused by abnormal operation on the surface, thus eliminating the risk of personal injury. Summary of the Invention

[0005] The purpose of this invention is to provide a trigger pulse circuit and system. This solution can not only enable the normal operation of the storage-type PNN logging tool, but also prevent the storage-type PNN logging tool from being hit by neutrons on the ground due to abnormal operation, thus eliminating personal injury and improving the safety of the solution.

[0006] To solve the above-mentioned technical problems, the present invention provides a trigger pulse circuit, comprising:

[0007] The output terminal of the time-delay controllable trigger circuit is connected to the input terminal of the high-voltage circuit of the neutron generator, and the power supply terminal is connected to the first power supply. It is used to convert the received CMOS level trigger signal into a CMOS level trigger pulse signal that can be recognized by the high-voltage circuit of the neutron generator when the first preset time after the first power supply is powered on is reached.

[0008] The input terminal of the high-voltage circuit of the neutron generator is connected to the neutron tube, and is used to generate a neutron firing pulse signal after receiving the CMOS level trigger pulse signal, and transmit the neutron firing pulse signal to the neutron tube.

[0009] Optionally, the delay-controllable trigger circuit includes: a shaping circuit, a microcontroller circuit, and a level conversion circuit;

[0010] The shaping circuit is connected to the input terminal of the microcontroller circuit and is used to convert the received CMOS level trigger signal into a corresponding TTL level signal.

[0011] The power supply terminal of the microcontroller circuit is connected to the first power supply and is used to transmit the TTL level signal to the level conversion circuit after receiving the TTL level signal and delaying for the first preset time when the first power supply is powered on.

[0012] The level conversion circuit is connected to the output terminal of the microcontroller circuit, and the output terminal is connected to the input terminal of the neutron generator high-voltage circuit. It is used to convert the TTL level signal into the CMOS level trigger pulse signal that can be recognized by the neutron generator high-voltage circuit.

[0013] Optionally, the high-voltage circuit of the neutron generator includes:

[0014] A neutron high voltage generating circuit, wherein the input terminal of the neutron high voltage generating circuit is connected to the output terminal of the delay controllable trigger circuit, and is used to generate a corresponding voltage after receiving the CMOS level trigger pulse signal transmitted by the delay controllable trigger circuit, wherein the voltage is greater than a preset voltage threshold.

[0015] A neutron high-voltage discharge circuit is provided, wherein the input terminal of the neutron high-voltage discharge circuit is connected to the output terminal of the neutron high-voltage generation circuit and the output terminal of the delay controllable trigger circuit, and the output terminal is connected to the neutron tube. The circuit is used to generate the neutron target-hitting pulse signal after receiving the voltage and the CMOS level trigger pulse signal, and transmit the neutron target-hitting pulse signal to the neutron tube.

[0016] Optionally, the microcontroller circuit includes: a crystal oscillator circuit, a first capacitor, a first resistor, and a microcontroller;

[0017] The crystal oscillator circuit is connected to the clock input pin and clock output pin of the microcontroller, respectively, and is used to transmit a preset clock signal to the microcontroller.

[0018] The power supply terminal of the microcontroller is connected to the power supply, the signal input terminal is connected to the output terminal of the shaping circuit, and the signal output terminal is connected to the signal input terminal of the level conversion circuit through the first resistor. This is used to enable the response function after the first power supply is powered on and a preset number of preset clock signals are received, after a first preset time delay. After the microcontroller enables the response function, the TTL level signal transmitted by the shaping circuit is transmitted to the level conversion circuit through the first resistor, and the current state of the microcontroller is reset.

[0019] The first end of the first capacitor is connected to the power supply, and the second end is connected to the reset pin of the microcontroller.

[0020] Optionally, the crystal oscillator circuit includes: a crystal oscillator, a second capacitor, and a third capacitor;

[0021] The first end of the crystal oscillator is connected to the first end of the second capacitor and the clock input pin of the microcontroller, respectively, and the second end is connected to the first end of the third capacitor and the clock output pin of the microcontroller, respectively.

[0022] The second terminal of the second capacitor and the second terminal of the third capacitor are both grounded.

[0023] Optionally, the microcontroller circuit further includes:

[0024] The second resistor, the first end of which is connected to the microcontroller;

[0025] The display prompt device is connected to the second terminal of the first power supply and the second resistor respectively, and is used to issue a first display prompt when the first power supply is powered on, and to issue a second display prompt after the microcontroller enables the response function.

[0026] Optionally, the display prompt device is a light-emitting diode (LED), with the anode of the LED connected to the first power supply and the cathode connected to the second end of the second resistor, for issuing a first display prompt when the first power supply is powered on, and issuing a second display prompt after the microcontroller enables the response function.

[0027] Optionally, the shaping circuit includes: a fourth capacitor, a third resistor, and a Zener diode;

[0028] The first terminal of the fourth capacitor is connected to the storage logging tool, and the second terminal is connected to the first terminal of the third resistor and the cathode of the Zener diode, respectively.

[0029] The second end of the third resistor is connected to the signal input terminal of the microcontroller.

[0030] The anode of the Zener diode is connected to ground.

[0031] Optionally, the level conversion circuit is a preset integrated chip. The signal input terminal of the preset integrated chip is connected to the signal output terminal of the microcontroller through the first resistor, the power supply terminal is connected to the second power supply, and the signal output terminal is connected to the input terminal of the neutron generator high-voltage circuit. It is used to convert the TTL level signal into the CMOS level trigger pulse signal that can be recognized by the neutron generator high-voltage circuit.

[0032] Optionally, the microcontroller circuit further includes: a resistor array and a DIP switch;

[0033] The N first terminals of the resistor array are all connected to the power supply, and the N second terminals are respectively connected to the N first terminals of the DIP switch and the N control pins of the microcontroller.

[0034] All N second terminals of the DIP switch are connected to ground and are used to pre-encode the level transmitted from the resistor array to the microcontroller based on a preset control signal. This enables the microcontroller to activate the response function after a second preset time delay following the first power supply being powered on and receiving the pre-encoded level. Furthermore, the microcontroller activates the response function after a third preset time delay following the first power supply being powered on, receiving the pre-encoded level, and a preset number of preset clock signals. The third preset time is the sum of the first preset time and the second preset time.

[0035] To address the aforementioned technical problems, the present invention also provides a trigger pulse system, comprising: a neutron tube and a trigger pulse circuit as described above, wherein the trigger pulse circuit is connected to the neutron tube.

[0036] The purpose of this invention is to provide a trigger pulse circuit and system. The delay-controllable trigger circuit in the trigger pulse circuit can convert the received CMOS level trigger signal into a CMOS level trigger pulse signal recognizable by the neutron generator high-voltage circuit at the first preset time after power-on. The neutron generator high-voltage circuit generates a neutron firing pulse signal after receiving the CMOS level trigger pulse signal and transmits it to the neutron tube. This ensures that the storage-type logging tool performs neutron firing only at the first preset time after power-on. This solution can not only realize the normal operation of the storage-type PNN logging tool, but also prevent neutron firing caused by abnormal operation of the storage-type PNN logging tool on the ground, thus eliminating personal injury and improving the safety of the solution. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 A schematic diagram of a trigger pulse circuit provided by the present invention;

[0039] Figure 2 A schematic diagram of another trigger pulse circuit provided by the present invention;

[0040] Figure 3 This is a schematic diagram of a delay-controllable trigger circuit provided by the present invention;

[0041] Figure 4 This is a schematic diagram of a delay trigger control strategy for a microcontroller provided by the present invention. Detailed Implementation

[0042] The core of this invention is to provide a trigger pulse circuit and system. This solution can not only enable the normal operation of the storage-type PNN logging tool, but also prevent the storage-type PNN logging tool from being hit by neutrons on the ground due to abnormal operation, thus eliminating personal injury and improving the safety of the solution.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Please refer to Figure 1 , Figure 1 A schematic diagram of a trigger pulse circuit provided by the present invention. The trigger pulse circuit includes:

[0045] The output terminal of the time-delay controllable trigger circuit 1 is connected to the input terminal of the neutron generator high voltage circuit 2, and the power supply terminal is connected to the first power supply. It is used to convert the received CMOS level trigger signal into a CMOS level trigger pulse signal that can be recognized by the neutron generator high voltage circuit 2 when the first preset time after the first power supply is powered on is reached.

[0046] The input terminal of the high-voltage circuit 2 of the neutron generator is connected to the neutron tube and is used to generate a neutron firing pulse signal after receiving a CMOS level trigger pulse signal, and transmit the neutron firing pulse signal to the neutron tube.

[0047] In this invention, after receiving a CMOS (Complementary Metal Oxide Semiconductor) level trigger signal, the delay-controllable trigger circuit 1 converts the CMOS level trigger signal into a CMOS level trigger pulse signal recognizable by the neutron generator high-voltage circuit 2, and transmits the CMOS level trigger pulse signal to the neutron generator high-voltage circuit 2. The neutron generator high-voltage circuit 2 then generates a neutron firing pulse signal upon receiving the CMOS level trigger pulse signal and transmits the neutron firing pulse signal to the neutron tube, so that the neutron tube emits neutrons upon receiving the neutron firing pulse signal. The trigger pulse circuit provided by this solution can ensure that there is a delay before the neutron tube performs the neutron firing operation, ensuring that the storage-type PNN logging tool will not perform neutron firing operation on the ground, eliminating personal injury and improving the safety of the solution.

[0048] It should be noted that, as Figure 2 As shown, compared with the old trigger pulse circuit, this application adds a time-delay controllable trigger circuit 1 before the CMOS level trigger signal enters the neutron high voltage generator circuit. The main function of the time-delay controllable trigger circuit 1 is that when the stored PNN is connected to the battery, the entire string of instruments starts to work. However, for the target-hitting circuit, during the initial period of operation (the stage when the ground instrument is preparing to go down into the well), even if a CMOS level trigger signal arrives, a target-hitting pulse cannot be generated, and the neutron generator cannot work, so it cannot cause neutron radiation hazards on the ground. After a certain delay (when the instrument has entered the well), the circuit is allowed to receive the CMOS level trigger signal and control the generation of neutron target-hitting pulses.

[0049] It should also be noted that, in practical applications, the trigger pulse circuit provided in this application can also be applied to direct-reading PNN logging tools. As long as a preset time delay is performed before neutron target hitting, the occurrence of neutron target hitting during instrument surface operation can be prevented. The time delay can be further delayed based on the basic delay time. The delay time can be set to cope with the time delay caused by possible situations on the surface when the instrument is ready to be lowered into the well.

[0050] This embodiment provides a trigger pulse circuit. The delay-controllable trigger circuit 1 in the trigger pulse circuit can convert the received CMOS level trigger signal into a CMOS level trigger pulse signal that can be recognized by the neutron generator high-voltage circuit 2 at the first preset time after power-on. The neutron generator high-voltage circuit 2 will generate a neutron firing pulse signal after receiving the CMOS level trigger pulse signal and transmit it to the neutron tube. This ensures that the storage-type logging tool will only perform neutron firing operation at the first preset time after power-on. This solution can not only realize the normal operation of the storage-type PNN logging tool, but also prevent neutron firing caused by abnormal operation of the storage-type PNN logging tool on the ground, thus eliminating personal injury and improving the safety of the solution.

[0051] Based on the above embodiments:

[0052] As an optional embodiment, the delay-controllable trigger circuit 1 includes: a shaping circuit, a microcontroller circuit, and a level conversion circuit;

[0053] The shaping circuit is connected to the input terminal of the microcontroller circuit and is used to convert the received CMOS level trigger signal into the corresponding TTL level signal;

[0054] The power supply terminal of the microcontroller circuit is connected to the first power supply and is used to transmit the TTL level signal to the level conversion circuit after receiving the TTL level signal and delaying for a first preset time when the first power supply is powered on.

[0055] The level conversion circuit is connected to the output terminal of the microcontroller circuit, and the output terminal is connected to the input terminal of the neutron generator high voltage circuit 2. It is used to convert the TTL (Transistor Transistor Logic) level signal into a CMOS level trigger pulse signal that can be recognized by the neutron generator high voltage circuit 2.

[0056] In this invention, the delay-controllable trigger circuit 1 includes a shaping circuit, a microcontroller circuit, and a level conversion circuit. The shaping circuit converts the received CMOS level trigger signal into a corresponding TTL level signal and transmits the TTL level signal to the microcontroller circuit. This allows the microcontroller circuit to receive a TTL level signal when the first power supply is turned on, and then delays for a first preset time before transmitting the TTL level signal to the level conversion circuit. The level conversion circuit then converts the TTL level signal into a CMOS level trigger pulse signal that can be recognized by the neutron generator high-voltage circuit 2, and transmits the CMOS level trigger pulse signal to the neutron generator high-voltage circuit 2, thus ensuring the accuracy of the delay process.

[0057] It should be noted that, as Figure 3As shown, the first part is the shaping circuit. This circuit receives a CMOS level trigger signal from the control section. The high level of the CMOS level trigger signal is typically around 11V, with a pulse width of approximately 30 microseconds. The shaping circuit converts this into a TTL level signal that the microcontroller U1 can receive. The shaping circuit consists of a fourth capacitor C4, a third resistor R3, and a Zener diode Z1. The fourth capacitor C4 is a 0.1uF, 0805 packaged high-temperature surface-mount capacitor; the Zener diode Z1 is a 5V Zener diode in a surface-mount package; and the first resistor R1 is a 100-ohm, 0805 packaged high-temperature surface-mount resistor.

[0058] Secondly, the microcontroller circuit is the core of the entire control system. After the instrument is powered on, there is a reasonable delay to ensure the PNN logging instrument safely enters the oil well before receiving the trigger signal from the shaping circuit. Simultaneously, the microcontroller circuit outputs a trigger signal to the level conversion circuit. The microcontroller circuit consists of a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a resistor array R4, a DIP switch S1, a Zener diode Z1, a crystal oscillator M1, and the microcontroller U1. The crystal oscillator M1, the second capacitor C2, and the third capacitor C3 form the clock oscillation circuit for the microcontroller U1. The second capacitor C2 and the third capacitor C3 are 20pF, 0805 packaged high-temperature surface-mount capacitors, and the crystal oscillator M1 is a 24MHz high-temperature crystal oscillator. The first capacitor, C1, is a 1uF, 1210-package high-temperature surface-mount capacitor. It is connected to VCC (the first power supply) and the reset terminal of microcontroller U1, forming the power-on reset of microcontroller U1. The resistor array R4 and the DIP switch S1 form the input level combinations for the P1 port of microcontroller U1. The resistor array R4 is a 4.7K resistor, and the DIP switch S1 is an 8-bit DIP switch. The 8-bit DIP switch S1 allows for 0-255 input combinations to the P1 port. The second resistor, R2, and the LED L1 form the output indicator for microcontroller U1. The working status of microcontroller U1 can be observed during operation based on the LED's indication. The second resistor R2 is a 1K, 0805-package high-temperature surface-mount resistor, and the LED L1 is a 0805-package surface-mount LED. Microcontroller U1 is a high-temperature microcontroller U189C2051PA. The trigger pulse output by the microcontroller U1 is connected to the level conversion circuit via the first resistor R1. The first resistor R1 is a 100-ohm, 0805 packaged high-temperature surface-mount capacitor.

[0059] The microcontroller U1 is the core of the entire circuit, and its flowchart is as follows: Figure 4As shown, the program consists of two parts: the main program and the interrupt routine. After the main program powers on and starts working, it first sets the working mode and time of timer T0, illuminates the indicator light to indicate that the microcontroller U1 has started working, disables interrupts (does not respond to trigger signals), and then waits for 1 hour (basic preparation time before going down the mine). After the time expires, it reads the level signal of port P1. According to the DIP switch S1, it can be set from 0 to 255, with each bit representing one minute, that is, from 0 to 256 minutes, to further delay (the delay time can be further set according to the specific situation on site). After the delay time expires, the indicator light is turned off to indicate that the waiting time has ended. At this time, the interrupt is enabled so that the interrupt routine can run and trigger pulse input is allowed. After the interrupt is enabled, if there is a trigger pulse input at the interrupt port INT0, the interrupt routine starts working. The interrupt routine first sends a 30µs wide pulse through the microcontroller U1 P37 port (consistent with the input trigger pulse), then changes the state of the indicator light (LED, Light Emitting Diode, LED L1) (indicating that a trigger pulse has been received), and finally clears the interrupt flag (waiting for the next interrupt) and exits the interrupt service routine.

[0060] The level conversion circuit converts the TTL level trigger pulse signal output by the microcontroller U1 into a CMOS level trigger pulse signal that can be recognized by the high-voltage circuit 2 of the neutron generator. The circuit is composed of an integrated circuit, specifically the TC4427 chip. The output level is controlled by the voltage at pin 6 and is connected to a 12V (secondary power supply) voltage.

[0061] As an optional embodiment, the neutron generator high-voltage circuit 2 includes:

[0062] The neutron high voltage generating circuit has its input terminal connected to the output terminal of the delay controllable trigger circuit 1. It is used to generate a corresponding voltage after receiving the CMOS level trigger pulse signal transmitted by the delay controllable trigger circuit 1. The voltage is greater than the preset voltage threshold.

[0063] The neutron high-voltage discharge circuit has its input terminals connected to the output terminals of the neutron high-voltage generation circuit and the delay-controlled trigger circuit 1, respectively. Its output terminal is connected to the neutron tube. It is used to generate a neutron target-hitting pulse signal after receiving voltage and CMOS level trigger pulse signals, and transmit the neutron target-hitting pulse signal to the neutron tube.

[0064] In this invention, the high-voltage circuit 2 of the neutron generator is equipped with a neutron high-voltage generation circuit and a neutron high-voltage discharge circuit. The neutron high-voltage generation circuit generates a corresponding voltage after receiving the CMOS level trigger pulse signal transmitted by the delay-controllable trigger circuit 1. The neutron high-voltage discharge circuit generates a neutron target-hitting pulse signal after receiving the voltage output by the neutron high-voltage generation circuit and the CMOS level trigger pulse signal transmitted by the delay-controllable trigger circuit 1, and transmits the neutron target-hitting pulse signal to the neutron tube, thus ensuring the accuracy of the neutron target-hitting pulse signal generation process.

[0065] As an optional embodiment, the microcontroller circuit includes: a crystal oscillator circuit, a first capacitor C1, a first resistor R1, and a microcontroller U1;

[0066] The crystal oscillator circuit is connected to the clock input pin and clock output pin of the microcontroller U1 respectively, and is used to transmit the preset clock signal to the microcontroller U1.

[0067] The power supply terminal of the microcontroller U1 is connected to the power supply, the signal input terminal is connected to the output terminal of the shaping circuit, and the signal output terminal is connected to the signal input terminal of the level conversion circuit through the first resistor R1. It is used to enable the response function after the first power supply is powered on and a preset number of preset clock signals are received and a first preset time is delayed. After the microcontroller U1 enables the response function, the TTL level signal transmitted by the shaping circuit is transmitted to the level conversion circuit through the first resistor R1 and the current state of the microcontroller U1 is reset.

[0068] The first terminal of the first capacitor C1 is connected to the power supply, and the second terminal is connected to the reset pin of the microcontroller U1.

[0069] In this invention, the microcontroller circuit includes a crystal oscillator circuit, a first capacitor C1, a first resistor R1, and a microcontroller U1. The crystal oscillator circuit provides a preset clock signal. Since the preset clock signal corresponds to a fixed and relatively short time, this solution allows sufficient time for the storage-type PNN logging tool to reach the well from the surface. The microcontroller U1 is powered on by the first power supply and receives a preset number of preset clock signals. After a first preset time delay, the microcontroller U1 activates its response function. After activating the response function, the TTL level signal transmitted by the shaping circuit is transmitted to the level conversion circuit, and the current state of the microcontroller U1 is reset. The first capacitor C1 acts as a filter, and the first resistor R1 acts as a voltage limiter, improving the reliability of the delay process.

[0070] As an optional embodiment, the crystal oscillator circuit includes: a crystal oscillator M1, a second capacitor C2, and a third capacitor C3;

[0071] The first end of the crystal oscillator M1 is connected to the first end of the second capacitor C2 and the clock input pin of the microcontroller U1, and the second end is connected to the first end of the third capacitor C3 and the clock output pin of the microcontroller U1.

[0072] The second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are both grounded.

[0073] In this invention, the crystal oscillator circuit includes a crystal oscillator M1, a second capacitor C2, and a third capacitor C3. The crystal oscillator circuit can transmit a corresponding signal, namely a preset clock signal, to the microcontroller U1 to ensure that the microcontroller U1 can successfully perform a delayed response.

[0074] As an optional embodiment, the microcontroller circuit further includes:

[0075] The second resistor R2, the first end of which is connected to the microcontroller U1;

[0076] The display device is connected to the first power supply and the second terminal of the second resistor R2 respectively. It is used to issue a first display prompt when the first power supply is powered on, and to issue a second display prompt after the microcontroller U1 enables the response function.

[0077] In this invention, the microcontroller circuit also includes a second resistor R2 and a display device. The second resistor R2 serves as a voltage limiter. When the first power supply is turned on, i.e., when the microcontroller U1 is powered on, a first display prompt is issued, indicating that the microcontroller U1 has started working but has not yet activated its response function. When the microcontroller U1 activates its response function, a second display prompt is issued, indicating that the microcontroller U1 has activated its response function. The display device allows users to intuitively see the working status of the microcontroller U1. If the microcontroller U1 starts working but has not activated its response function for a long time, the fault can be identified in a timely manner, facilitating subsequent maintenance.

[0078] It should be noted that in practical applications, devices with prompting functions, such as sound prompting devices, can be used instead of display prompting devices.

[0079] As an optional embodiment, the display prompt device is a light-emitting diode L1. The anode of the light-emitting diode L1 is connected to the first power supply, and the cathode is connected to the second end of the second resistor R2. It is used to issue a first display prompt when the first power supply is powered on, and to issue a second display prompt after the microcontroller U1 enables the response function.

[0080] In this invention, the display device is a light-emitting diode L1, which has the advantages of being robust, durable, highly reliable, and energy-efficient.

[0081] It should be noted that in practical applications, the display device can be a light-emitting diode (LED) L1, or it can be a light bulb or other display device.

[0082] As an optional embodiment, the shaping circuit includes: a fourth capacitor C4, a third resistor R3, and a Zener diode Z1;

[0083] The first terminal of the fourth capacitor C4 is connected to the storage logging tool, and the second terminal is connected to the first terminal of the third resistor R3 and the cathode of the Zener diode Z1.

[0084] The second end of the third resistor R3 is connected to the signal input terminal of the microcontroller U1;

[0085] The anode of the Zener diode Z1 is connected to ground.

[0086] In this invention, the shaping circuit includes a fourth capacitor C4, a third resistor R3, and a Zener diode Z1. The third resistor R3 and the fourth capacitor C4 form an RC filter circuit, while the Zener diode Z1 stabilizes the voltage. This solution utilizes the characteristic that the reverse voltage of the Zener diode Z1 does not change with the reverse current within a certain reverse current range after reverse breakdown, thus achieving voltage stabilization. This not only converts the received CMOS level trigger signal into a corresponding TTL level signal but also protects the entire trigger pulse circuit.

[0087] As an optional embodiment, the level conversion circuit is a preset integrated chip U2. The signal input terminal of the preset integrated chip U2 is connected to the signal output terminal of the microcontroller U1 through the first resistor R1, the power supply terminal is connected to the second power supply, and the signal output terminal is connected to the input terminal of the neutron generator high voltage circuit 2. It is used to convert the TTL level signal into a CMOS level trigger pulse signal that can be recognized by the neutron generator high voltage circuit 2.

[0088] In this invention, the level conversion circuit is a preset integrated chip U2. The function of the preset integrated chip U2 is to convert the TTL level signal into a CMOS level trigger pulse signal that can be recognized by the high voltage circuit 2 of the neutron generator, thus ensuring the integrity of the solution.

[0089] As an optional embodiment, the microcontroller circuit also includes: a resistor array R4 and a DIP switch S1;

[0090] All N first terminals of the resistor array R4 are connected to the power supply, and the N second terminals are respectively connected to the N first terminals of the DIP switch S1 and the N control pins of the microcontroller U1.

[0091] All N second terminals of the DIP switch S1 are connected to ground. They are used to preset encode the level transmitted from the resistor R4 to the microcontroller U1 based on the preset control signal. This allows the microcontroller U1 to start the response function after a second preset time delay when the first power supply is turned on and the preset encoded level is received. The third preset time is the sum of the first and second preset times.

[0092] In this invention, the microcontroller circuit also includes a resistor array R4 and a DIP switch S1. The DIP switch S1 can preset the level output from the resistor array R4 to the microcontroller U1 according to the received preset control signal. For example, if both the resistor array R4 and the DIP switch S1 are four-bit, the encoded level can be 0010, 1011, etc. After receiving the encoded level, the microcontroller U1 will determine its corresponding delay time. In actual operation, if the preset clock signal transmitted by the crystal oscillator circuit cannot meet the actual needs, then after the microcontroller U1 is powered on and receives a preset number of preset clock signals transmitted by the crystal oscillator circuit, if it receives the encoded level, the microcontroller U1 will delay by a second preset time corresponding to the encoded level on the basis of the first preset time. In fact, it will delay by a third preset time before starting the response function. Without changing the crystal oscillator circuit parameters, the delay time of the microcontroller U1's response function is accurately and directly controlled.

[0093] The present invention also provides an embodiment of a trigger pulse system, comprising: a neutron tube and a trigger pulse circuit as described above, wherein the trigger pulse circuit is connected to the neutron tube.

[0094] The trigger pulse system provided in this embodiment corresponds to the trigger pulse circuit described above, and therefore has the same beneficial effects as the trigger pulse circuit described above. Therefore, for the embodiment of the trigger pulse system, please refer to the description of the embodiment of the trigger pulse circuit, which will not be repeated here.

[0095] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0096] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A trigger pulse circuit, characterized in that, include: The output terminal of the time-delay controllable trigger circuit is connected to the input terminal of the high-voltage circuit of the neutron generator, and the power supply terminal is connected to the first power supply. It is used to convert the received CMOS level trigger signal into a CMOS level trigger pulse signal that can be recognized by the high-voltage circuit of the neutron generator when the first preset time after the first power supply is powered on is reached. The input terminal of the high-voltage circuit of the neutron generator is connected to the neutron tube, and is used to generate a neutron firing pulse signal after receiving the CMOS level trigger pulse signal, and transmit the neutron firing pulse signal to the neutron tube.

2. The trigger pulse circuit of claim 1, wherein, The delay-controllable trigger circuit includes: a shaping circuit, a microcontroller circuit, and a level conversion circuit; The shaping circuit is connected to the input terminal of the microcontroller circuit and is used to convert the received CMOS level trigger signal into a corresponding TTL level signal. The power supply terminal of the microcontroller circuit is connected to the first power supply and is used to transmit the TTL level signal to the level conversion circuit after receiving the TTL level signal and delaying for the first preset time when the first power supply is powered on. The level conversion circuit is connected to the output terminal of the microcontroller circuit, and the output terminal is connected to the input terminal of the neutron generator high-voltage circuit. It is used to convert the TTL level signal into the CMOS level trigger pulse signal that can be recognized by the neutron generator high-voltage circuit.

3. The trigger pulse circuit of claim 1, wherein, The high-voltage circuit of the neutron generator includes: A neutron high voltage generating circuit, wherein the input terminal of the neutron high voltage generating circuit is connected to the output terminal of the delay controllable trigger circuit, and is used to generate a corresponding voltage after receiving the CMOS level trigger pulse signal transmitted by the delay controllable trigger circuit, wherein the voltage is greater than a preset voltage threshold. A neutron high-voltage discharge circuit is provided, wherein the input terminal of the neutron high-voltage discharge circuit is connected to the output terminal of the neutron high-voltage generation circuit and the output terminal of the delay controllable trigger circuit, and the output terminal is connected to the neutron tube. The circuit is used to generate the neutron target-hitting pulse signal after receiving the voltage and the CMOS level trigger pulse signal, and transmit the neutron target-hitting pulse signal to the neutron tube.

4. The trigger pulse circuit of claim 2, wherein, The microcontroller circuit includes: a crystal oscillator circuit, a first capacitor, a first resistor, and a microcontroller; The crystal oscillator circuit is connected to the clock input pin and clock output pin of the microcontroller, respectively, and is used to transmit a preset clock signal to the microcontroller. The power supply terminal of the microcontroller is connected to the power supply, the signal input terminal is connected to the output terminal of the shaping circuit, and the signal output terminal is connected to the signal input terminal of the level conversion circuit through the first resistor. This is used to enable the response function after the first power supply is powered on and a preset number of preset clock signals are received, after a first preset time delay. After the microcontroller enables the response function, the TTL level signal transmitted by the shaping circuit is transmitted to the level conversion circuit through the first resistor, and the current state of the microcontroller is reset. The first end of the first capacitor is connected to the power supply, and the second end is connected to the reset pin of the microcontroller.

5. The trigger pulse circuit of claim 4, wherein, The crystal oscillator circuit includes: a crystal oscillator, a second capacitor, and a third capacitor; The first end of the crystal oscillator is connected to the first end of the second capacitor and the clock input pin of the microcontroller, respectively, and the second end is connected to the first end of the third capacitor and the clock output pin of the microcontroller, respectively. The second terminal of the second capacitor and the second terminal of the third capacitor are both grounded.

6. The trigger pulse circuit of claim 4, wherein, The microcontroller circuit also includes: The second resistor, the first end of which is connected to the microcontroller; The display prompt device is connected to the second terminal of the first power supply and the second resistor respectively, and is used to issue a first display prompt when the first power supply is powered on, and to issue a second display prompt after the microcontroller enables the response function.

7. The trigger pulse circuit of claim 6, wherein, The display prompt device is a light-emitting diode (LED). The anode of the LED is connected to the first power supply, and the cathode is connected to the second end of the second resistor. The LED is used to issue a first display prompt when the first power supply is powered on, and to issue a second display prompt after the microcontroller enables the response function.

8. The trigger pulse circuit of claim 2, wherein, The shaping circuit includes: a fourth capacitor, a third resistor, and a Zener diode; The first terminal of the fourth capacitor is connected to the storage logging tool, and the second terminal is connected to the first terminal of the third resistor and the cathode of the Zener diode, respectively. The second end of the third resistor is connected to the signal input terminal of the microcontroller. The anode of the Zener diode is connected to ground.

9. The trigger pulse circuit of claim 2, wherein, The level conversion circuit is a preset integrated chip. The signal input terminal of the preset integrated chip is connected to the signal output terminal of the microcontroller through the first resistor, the power supply terminal is connected to the second power supply, and the signal output terminal is connected to the input terminal of the neutron generator high voltage circuit. It is used to convert the TTL level signal into the CMOS level trigger pulse signal that can be recognized by the neutron generator high voltage circuit.

10. A trigger pulse circuit as claimed in any one of claims 4 to 7, characterized in that The microcontroller circuit also includes: a resistor array and a DIP switch; The N first terminals of the resistor array are all connected to the power supply, and the N second terminals are respectively connected to the N first terminals of the DIP switch and the N control pins of the microcontroller. All N second terminals of the DIP switch are connected to ground and are used to pre-encode the level transmitted from the resistor array to the microcontroller based on a preset control signal. This enables the microcontroller to activate the response function after a second preset time delay following the first power supply being powered on and receiving the pre-encoded level. Furthermore, the microcontroller activates the response function after a third preset time delay following the first power supply being powered on, receiving the pre-encoded level, and a preset number of preset clock signals. The third preset time is the sum of the first preset time and the second preset time.

11. A triggered pulse system, characterized by include: The neutron tube and the trigger pulse circuit as described in any one of claims 1 to 10, wherein the trigger pulse circuit is connected to the neutron tube.

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