Source range plate member test circuit and apparatus

Abstract

The utility model relates to source range board piece test circuit and device, and its circuit includes: analog quantity input unit for connecting the impulse processing board piece among source range board piece, and gathers the impulse processing signal of impulse processing board piece output, analog quantity output unit for connecting the high voltage board piece among source range board piece, and exports high voltage reference signal to high voltage board piece, pulse generation unit for connecting impulse processing board piece, and exports pulse signal to impulse processing board piece, load control unit for connecting high voltage board piece, and control high voltage board piece load size, and main control unit is connected with analog quantity input unit, analog quantity output unit, pulse generation unit and load control unit, is used for receiving impulse processing signal to control analog quantity output unit, pulse generation unit and load control unit work. The utility model has realized the off line test of source range board piece, helps to improve source range board piece's test efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of extra-core neutron measurement systems, and in particular to a source range board test circuit and device. Background Technology

[0002] Source range boards are used to monitor reactor neutron flux and are crucial for reactor protection. Their proper functioning is critical to nuclear power plant safety; therefore, the high-voltage and pulse processing components within the source range board must be tested periodically. Because the load on the high-voltage board lacks control mechanisms during reactor shutdown, current technologies typically require testing the source range board without shutting down the reactor. Therefore, nuclear power plants urgently need a solution for offline testing of source range boards. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a source range board test circuit and device.

[0004] The technical solution adopted by this utility model to solve its technical problem is: constructing a source range board test circuit, including:

[0005] The analog input unit is used to connect to the pulse processing board in the source range board and to acquire the pulse processing signal output by the pulse processing board.

[0006] An analog output unit is used to connect to the high-voltage board in the source range board and output a high-voltage reference signal to the high-voltage board.

[0007] A pulse generation unit is used to connect to the pulse processing board and output a pulse signal to the pulse processing board;

[0008] A load control unit is used to connect to the high-voltage board and control the load on the high-voltage board; and

[0009] The main control unit is connected to the analog input unit, analog output unit, pulse generation unit, and load control unit. It is used to receive the pulse processing signal, output the test result, and control the operation of the analog output unit, pulse generation unit, and load control unit.

[0010] Preferably, the load control unit includes a plurality of resistive units and a plurality of control switches corresponding one-to-one with the plurality of resistive units; the resistive units are connected in series to form a series chain; the first end of the resistive unit located at the first end of the series chain is connected to the main control unit, and the second end of each resistive unit is connected to the high-voltage board via the corresponding control switch; each control switch is also connected to the main control unit for disconnecting or closing the connection between the corresponding resistive unit and the high-voltage board.

[0011] Preferably, each resistive unit includes a plurality of first resistors R1, and the first resistors R1 in each resistive unit are connected in series, in parallel, or in both series and parallel.

[0012] Preferably, each of the control switches includes a relay K1, a fourth resistor R4, a unidirectional conduction unit, and a relay control unit;

[0013] The first contact of relay K1 is connected to the second end of the resistive unit. The second contact of relay K1 is connected to the high-voltage board via the unidirectional conduction unit. The second contact of relay K1 is also connected to the high-voltage ground via the fourth resistor R4. The first end of the excitation coil of relay K1 is connected to the second DC voltage. The second end of the excitation coil of relay K1 is connected to the relay control unit. The relay control unit is also connected to the main control unit.

[0014] Preferably, the relay control unit includes a switching transistor Q1 and a second resistor R2. The input terminal of the switching transistor Q1 is connected to the second terminal of the excitation coil of the relay K1, the output terminal of the switching transistor Q1 is connected to digital ground, the control terminal of the switching transistor Q1 is connected to the main control unit, and the control terminal of the switching transistor Q1 is also connected to digital ground via the second resistor R2.

[0015] Preferably, the load control unit further includes a voltage follower unit, the input terminal of which is connected to each of the control switches, and the output terminal of which is used to connect to the high-voltage board.

[0016] Preferably, the pulse generating unit includes an adjustable pulse generator.

[0017] Preferably, the adjustable pulse generator has a pulse amplitude range of 0V to 5V, a frequency range of 0MHz to 10MHz, and a pulse duty cycle range of 1% to 99%.

[0018] Preferably, the analog input unit includes an analog-to-digital converter circuit, which is connected between the pulse processing board and the main control unit. The analog-to-digital converter circuit converts the pulse processing signal output by the pulse processing board into a digital signal and feeds it back to the main control unit.

[0019] Preferably, the analog output unit includes a digital-to-analog converter circuit, which is connected between the high-voltage board and the main control unit. The digital-to-analog converter circuit is used to output a high-voltage reference signal to the high-voltage board according to the control of the main control unit.

[0020] This utility model also constructs a source range board testing device, including the source range board testing circuit described herein.

[0021] The present invention provides the following advantages: It provides a source range board test circuit. First, an analog output unit outputs a high-voltage reference signal to the high-voltage board, which controls the output high voltage level. A pulse generation unit outputs a pulse signal to the pulse processing board. A load control unit controls the load on the high-voltage board, thus creating an environment for offline testing of the source range board. Next, an analog input unit acquires the pulse processing signal output by the pulse processing board. Then, a main control unit receives the pulse processing signal and generates corresponding test results, achieving offline testing of the source range board and improving its testing efficiency. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0023] Figure 1 This is a circuit structure block diagram of the source range board test circuit in some embodiments of this utility model;

[0024] Figure 2 This is a circuit diagram of the load control unit in some embodiments of this utility model;

[0025] Figure 3 This is a circuit diagram of the voltage follower unit in some embodiments of this utility model. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] Figure 1 This is a circuit structure block diagram of the source range board test circuit in some embodiments of this utility model. The source range board test circuit may include an analog input unit 1, an analog output unit 2, a pulse generation unit 3, a load control unit 4, and a main control unit 5.

[0028] Analog input unit 1 is used to connect to the pulse processing board in the source range board and to acquire the pulse processing signal output by the pulse processing board. The pulse processing signal is an analog signal that can characterize the magnitude of the neutron fluence rate.

[0029] In some embodiments, the analog input unit 1 may include an analog-to-digital converter (ADC) circuit connected between the pulse processing board and the main control unit 5. The ADC circuit converts the pulse processing signal output by the pulse processing board into a digital signal and feeds it back to the main control unit 5. The ADC circuit can be any existing ADC circuit capable of converting the pulse processing signal into a digital signal, and is not limited thereto.

[0030] Analog output unit 2 is used to connect to the high-voltage board in the source range board and output a high-voltage reference signal to the high-voltage board. The high-voltage reference signal is used to control the output high voltage of the high-voltage board.

[0031] In some embodiments, the analog output unit 2 may include a digital-to-analog converter (DAC) circuit connected between the high-voltage board and the main control unit 5. The DAC circuit is used to output a high-voltage reference signal to the high-voltage board according to the control of the main control unit 5. The DAC circuit can be any existing DAC circuit capable of converting the high-voltage reference signal into an analog signal, and is not limited thereto.

[0032] Pulse generation unit 3 is used to connect to the pulse processing board and output pulse signals to the pulse processing board. The pulse signals are used to simulate the output signals of the neutron detector, enabling testing of the pulse processing board even when it is offline or shut down.

[0033] In some embodiments, the pulse generating unit 3 may include an existing adjustable pulse generator. The pulse amplitude range of the adjustable pulse generator is preferably 0V to 5V, the frequency range is preferably 0MHz to 10MHz, and the pulse duty cycle range is preferably 1% to 99%.

[0034] The load control unit 4 is used to connect to the high-voltage board and control the load on the high-voltage board. The load control unit 4 can control the load intensity of the high-voltage board, thereby verifying the high-voltage status of the source range board.

[0035] In some embodiments, such as Figure 2 As shown, the load control unit 4 may include multiple resistive units 41 and multiple control switches 42 corresponding to each resistive unit 41. The resistive units 41 are connected in series to form a series chain; the first end of the resistive unit 41 located at the first end of the series chain is connected to the main control unit 5, and the second end of each resistive unit 41 is connected to the high-voltage board via the corresponding control switch 42; each control switch 42 is also connected to the main control unit 5 to disconnect or close the connection between the corresponding resistive unit 41 and the high-voltage board according to the control of the main control unit 5.

[0036] Understandably, in this embodiment, the main control unit 5 can control one of the control switches 42 to be turned on according to the load demand, thereby controlling the magnitude of the voltage signal HV_AD_OUT input to the high-voltage board. For example, the control switch 42 connected to the resistive unit 41 at the beginning of the series chain (corresponding to...) Figure 2 When the rightmost control switch 42 is turned on, the voltage signal HV_AD_OUT is at its maximum. When the control switch 42 (corresponding to the control switch 42 connected to the resistive unit 41 at the end of the series link) is turned on, the voltage signal HV_AD_OUT is at its maximum. Figure 2 When the leftmost control switch 42) is turned on, the voltage signal HV_AD_OUT is at its minimum.

[0037] In some embodiments, such as Figure 2 As shown, each resistive unit 41 may include several first resistors R1, and the first resistors R1 in each resistive unit 41 may be connected in series, in parallel, or in both series and parallel. It should be noted that the number and resistance value of the first resistors R1 in each resistive unit 41 may be the same or different, and the specific number and resistance value can be designed according to the actual situation.

[0038] In some embodiments, such as Figure 2 As shown, each control switch 42 may include a relay K1, a fourth resistor R4, a unidirectional conduction unit 421, and a relay control unit 422. The first contact of relay K1 is connected to the second end of the resistive unit 41, the second contact of relay K1 is connected to the high-voltage board via the unidirectional conduction unit 421, and the second contact of relay K1 is also connected to the high-voltage ground via the fourth resistor R4. The first end of the excitation coil of relay K1 is connected to the second DC voltage, and the second end of the excitation coil of relay K1 is connected to the relay control unit 422. The relay control unit 422 is also connected to the main control unit 5.

[0039] It should be noted that the resistance value of the fourth resistor R4 in each control switch 42 can be the same or different.

[0040] In some embodiments, the unidirectional conduction unit 421 may include a first diode D1, the anode of which is connected to the second contact of the relay K1, and the cathode of which is connected to a high-voltage board. The first diode D1 is used to prevent current from flowing back to the second contact of the relay K1.

[0041] In some embodiments, such as Figure 2As shown, each relay control unit 422 may include a switching transistor Q1 and a second resistor R2. The input terminal of the switching transistor Q1 is connected to the second terminal of the excitation coil of the relay K1, the output terminal of the switching transistor Q1 is connected to digital ground, the control terminal of the switching transistor Q1 is connected to the main control unit 5, and the control terminal of the switching transistor Q1 is also connected to digital ground via the second resistor R2. In this embodiment, the switching transistor Q1 can be an NMOS transistor, and the input terminal, control terminal, and output terminal of the switching transistor Q1 correspond to the drain, gate, and source of the NMOS transistor, respectively. In addition, the second resistor R2 acts as a pull-down resistor to prevent the switching transistor Q1 from being mis-turned on.

[0042] In addition, such as Figure 2 As shown, each relay control unit 422 may also include a fifth resistor R5 for current limiting, which is connected in series between the control terminal of the switching transistor Q1 and the main control unit 5.

[0043] In some embodiments, each control switch 42 may also include a second diode D2, the cathode and anode of which are connected in sequence to the first and second contacts of the relay K1 to provide a freewheeling function and prevent the relay K1 from being damaged by the reverse voltage.

[0044] The working principle of control switch 42 is as follows: Please refer to... Figure 2 Taking the leftmost control switch 42 as an example, when the control terminal of its switching transistor Q1 is set to a high level by the main control unit 5, and the control terminals of the switching transistors Q1 in other control switches 42 are all set to a low level, the switching transistor Q1 is turned on, the excitation coil of its relay K1 is energized, and the relay K1 is turned on. The entire series chain and the fourth resistor R4 in the control switch 42 form a voltage divider circuit. Since the resistance of the series chain is at its maximum at this time, the voltage signal HV_AD_OUT is at its minimum. Similarly, taking the rightmost control switch 42 as an example, when the control terminal of its switching transistor Q1 is set to a high level by the main control unit 5, and the control terminals of the switching transistors Q1 in other control switches 42 are all set to a low level, the relay K1 of the rightmost control switch 42 is turned on. At this time, it is equivalent to only the resistive unit 41 located at the beginning of the series chain being connected in series with the high-voltage board, and the voltage signal HV_AD_OUT is at its maximum.

[0045] In some embodiments, such as Figure 2 As shown, each control switch 42 may also include a third resistor R3 and a sixth resistor R6. The first end of the third resistor R3 is connected to the cathode of the first diode D1, and the second end of the third resistor R3 is used to connect to the high-voltage board. The third resistor R3 plays a role in increasing the output impedance, which helps to improve the stability of the voltage signal HV_AD_OUT.

[0046] To improve the signal stability input to the high-voltage board from the load control unit 4, in some embodiments, the load control unit 4 may further include, for example: Figure 3 The voltage follower unit is shown. The input terminal of the voltage follower unit is simultaneously connected to the second terminal of the third resistor R3 in each control switch 42, and the output terminal of the voltage follower unit is used to connect to the high-voltage board.

[0047] In some embodiments, such as Figure 3 As shown, the voltage follower unit may include an operational amplifier U1, a first capacitor C1, a tenth resistor R10, and a twelfth resistor R12. The non-inverting input of operational amplifier U1 is connected to the second terminal of the third resistor R3 in all control switches 42. The non-inverting input of operational amplifier U1 is also connected to high voltage ground via the first capacitor C1. The inverting input of operational amplifier U1 is connected to the output of operational amplifier U1 via the tenth resistor R10. The output of operational amplifier U1 is connected to the first terminal of the twelfth resistor R12, and the second terminal of the twelfth resistor R12 is used to connect to the high-voltage board. In this embodiment, the twelfth resistor R12 is typically a low-resistance resistor (even a 0-ohm resistor), and its function is to perform impedance matching.

[0048] The main control unit 5 is connected to the analog input unit 1, the analog output unit 2, the pulse generation unit 3, and the load control unit 4. The main control unit 5 is used to receive pulse processing signals, output test results, and control the operation of the analog output unit 2, the pulse generation unit 3, and the load control unit 4.

[0049] In some embodiments, the main control unit 5 may include a microprocessor and a human-machine interface (HMI) device (such as a touch screen), and the microprocessor may be an STM32F407. Specifically, the microprocessor can control the analog output unit 2 to operate according to the operation of the HMI device, thereby setting the output high voltage of the high-voltage board; the microprocessor also controls the load control unit 4 to operate according to the operation of the HMI device, thereby controlling the load output of the high-voltage board. The microprocessor also controls the pulse generation unit 3 to output a pulse signal to the pulse processing board, thereby constructing a test environment. Then, the microprocessor can receive the pulse processing signal from the analog input unit 1 and execute an existing computer program to determine the neutron fluence rate based on the pulse processing signal. The microprocessor also sends the test results to the HMI device to display the test results. The test results include, but are not limited to, the pulse processing signal (or neutron fluence rate), the high voltage reference signal, and the comparison results between the pulse processing signal and the pulse theoretical signal.

[0050] The technical solution of this utility model first outputs a high-voltage reference signal to the high-voltage board through an analog output unit, which can control the output high voltage of the high-voltage board. The pulse generation unit outputs a pulse signal to the pulse processing board, and the load control unit controls the load of the high-voltage board to create an environment that can test the source range board offline. Then, the analog input unit collects the pulse processing signal output by the pulse processing board, and then the main control unit receives the pulse processing signal and generates the corresponding test results, realizing the offline testing of the source range board and helping to improve the testing efficiency of the source range board.

[0051] This utility model also provides a source range board testing device, including the source range board testing circuit provided in the embodiments of this utility model.

[0052] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A source range board test circuit, characterized in that, include: Analog input unit (1) is used to connect to the pulse processing board in the source range board and to acquire the pulse processing signal output by the pulse processing board; Analog output unit (2) is used to connect to the high voltage board in the source range board and output a high voltage reference signal to the high voltage board; A pulse generation unit (3) is used to connect to the pulse processing board and output a pulse signal to the pulse processing board; A load control unit (4) is used to connect to the high-voltage board and control the load size of the high-voltage board; as well as The main control unit (5) is connected to the analog input unit (1), analog output unit (2), pulse generation unit (3) and load control unit (4), and is used to receive the pulse processing signal, output the test result, and control the analog output unit (2), pulse generation unit (3) and load control unit (4) to work.

2. The source range board test circuit according to claim 1, characterized in that, The load control unit (4) includes a plurality of resistive units (41) and a plurality of control switches (42) corresponding one-to-one with the plurality of resistive units (41); each resistive unit (41) is connected in series to form a series chain; the first end of the resistive unit (41) located at the first end of the series chain is connected to the main control unit (5), and the second end of each resistive unit (41) is connected to the high voltage board via the corresponding control switch (42); each control switch (42) is also connected to the main control unit (5) for disconnecting or closing the connection between the corresponding resistive unit (41) and the high voltage board.

3. The source range board test circuit according to claim 2, characterized in that, Each of the resistive units (41) includes a plurality of first resistors R1, wherein the first resistors R1 in each of the resistive units (41) are connected in series, in parallel, or in series and in parallel with each other.

4. The source range board test circuit according to claim 2, characterized in that, Each of the control switches (42) includes a relay K1, a fourth resistor R4, a unidirectional conduction unit (421), and a relay control unit (422); The first contact of the relay K1 is connected to the second end of the resistive unit (41), the second contact of the relay K1 is connected to the high voltage board via the unidirectional conduction unit (421), the second contact of the relay K1 is also connected to the high voltage ground via the fourth resistor R4, the first end of the excitation coil of the relay K1 is connected to the second DC voltage, the second end of the excitation coil of the relay K1 is connected to the relay control unit (422), and the relay control unit (422) is also connected to the main control unit (5).

5. The source range board test circuit according to claim 4, characterized in that, The relay control unit (422) includes a switch Q1 and a second resistor R2. The input terminal of the switch Q1 is connected to the second terminal of the excitation coil of the relay K1. The output terminal of the switch Q1 is connected to digital ground. The control terminal of the switch Q1 is connected to the main control unit (5). The control terminal of the switch Q1 is also connected to digital ground via the second resistor R2.

6. The source range board test circuit according to any one of claims 2 to 5, characterized in that, The load control unit (4) further includes a voltage follower unit, the input of which is connected to each of the control switches (42), and the output of which is connected to the high voltage board.

7. The source range board test circuit according to claim 1, characterized in that, The pulse generating unit (3) includes an adjustable pulse generator; wherein the pulse amplitude range of the adjustable pulse generator is 0V to 5V, the frequency range of the adjustable pulse generator is 0MHz to 10MHz, and the pulse duty cycle range of the adjustable pulse generator is 1% to 99%.

8. The source range board test circuit according to claim 1, characterized in that, The analog input unit (1) includes an analog-to-digital converter circuit, which is connected between the pulse processing board and the main control unit (5). The analog-to-digital converter circuit converts the pulse processing signal output by the pulse processing board into a digital signal and feeds it back to the main control unit (5).

9. The source range board test circuit according to claim 1, characterized in that, The analog output unit (2) includes a digital-to-analog converter circuit, which is connected between the high-voltage board and the main control unit (5). The digital-to-analog converter circuit is used to output a high-voltage reference signal to the high-voltage board according to the control of the main control unit (5).

10. A source range plate testing device, characterized in that, Includes the source range board test circuit as described in any one of claims 1 to 9.

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