Current sampling circuit for collecting signals of nuclear radiation detector and high-voltage power supply

Abstract

The invention discloses a current sampling circuit for collecting signals of a nuclear radiation detector and a high-voltage power supply, the current sampling circuit is arranged in the nuclear radiation detector comprising the high-voltage power supply, the high-voltage power supply comprises a voltage transformation assembly, and the current sampling circuit comprises a sampling resistance adjustable collecting unit and a resistance adjusting unit. The sampling resistance value adjustable acquisition unit is connected with the secondary side of the voltage transformation assembly, and the sampling resistance value adjustable acquisition unit is used for acquiring the voltage of the secondary side of the voltage transformation assembly and outputting the acquired voltage. And the resistance value adjusting unit is connected with the sampling resistance value adjustable acquisition unit and is used for controlling the sampling resistance value of the sampling resistance value adjustable acquisition unit to dynamically change until the sampling resistance value is stable according to the first voltage. Wherein the current of the nuclear radiation detector is the ratio of the target voltage to the target resistance value, the target resistance value is the sampling resistance value when the sampling resistance value adjustable acquisition unit adjusts the resistance value to be stable, and the target voltage is the voltage collected by the sampling resistance value adjustable acquisition unit under the target resistance value.

Description

Technical Field

[0001] The present application relates to the field of nuclear radiation detector measurement technology, and in particular to a current sampling circuit and a high-voltage power supply for collecting nuclear radiation detector signals. Background Art

[0002] In the field of nuclear radiation detector measurement, the nuclear instrument system of a nuclear power plant is one of the most critical systems of the reactor. The reactor neutron injection rate level is monitored by using the nuclear measurement detectors distributed outside the reactor pressure vessel, thereby monitoring the reactor power. When detecting the neutron injection rate level, it is necessary to provide a high-voltage power supply to the nuclear radiation detector to ionize the gas molecules, and the current of the nuclear radiation detector needs to be measured.

[0003] However, the high-voltage power supply device of the nuclear radiation detector generally does not have a current recovery function, so an independent current measuring device is required to measure the current of the nuclear radiation detector. Summary of the invention

[0004] The present application aims to propose a current sampling circuit and a high-voltage power supply for collecting nuclear radiation detector signals, which can solve the problem of needing to use an independent current measuring device to measure the current of the nuclear radiation detector.

[0005] In a first aspect, an embodiment of the present application provides a current sampling circuit, which is arranged in a nuclear radiation detector including a high-voltage power supply, wherein the high-voltage power supply includes a transformer component, and the current sampling circuit includes:

[0006] A sampling resistance adjustable acquisition unit is connected to the secondary side of the transformer assembly, and the sampling resistance adjustable acquisition unit is used to collect the voltage of the secondary side of the transformer assembly and output the collected voltage;

[0007] A resistance adjustment unit connected to the sampling resistance adjustable acquisition unit, the resistance adjustment unit is used to control the dynamic change of the sampling resistance of the sampling resistance adjustable acquisition unit according to a first voltage until the sampling resistance of the sampling resistance adjustable acquisition unit is adjusted to be stable, and the first voltage is the voltage collected by the sampling resistance adjustable acquisition unit;

[0008] Among them, the current of the nuclear radiation detector is the ratio between the target voltage and the target resistance, the target resistance is the sampling resistance adjusted to a stable resistance by the sampling resistance adjustable acquisition unit, and the target voltage is the voltage collected by the sampling resistance adjustable acquisition unit at the target resistance.

[0009] According to some embodiments of the present application, the resistance adjustment unit includes:

[0010] A window comparison subunit, wherein the sampling resistance adjustable acquisition unit is connected to the window comparison subunit, and the window comparison subunit is used to confirm whether the first voltage is within a preset voltage range, and output a control signal if the first voltage is not within the preset voltage range;

[0011] a counting subunit, the window comparison subunit being connected to the counting subunit, and the counting subunit being used for counting when receiving the control signal;

[0012] The decoding subunit is connected to the counting subunit, the decoding subunit is connected to the sampling resistance adjustable acquisition unit, and the decoding subunit is used to control the sampling resistance change of the sampling resistance adjustable acquisition unit according to the counting value of the counting subunit.

[0013] According to some embodiments of the present application, the window comparison subunit includes:

[0014] A first comparator, wherein the sampling resistance adjustable acquisition unit is connected to a first input terminal of the first comparator, a second input terminal of the first comparator is used to input a voltage upper limit value of the preset voltage range, an output terminal of the first comparator is connected to a first input terminal of the counting subunit, and the first comparator is used to control the counting subunit to count according to a comparison result of the voltage upper limit value and the first voltage;

[0015] A second comparator, wherein the first input terminal of the second comparator is used to input the voltage lower limit value of the preset voltage range, the second input terminal of the second comparator is connected to the sampling resistance adjustable acquisition unit, the output terminal of the second comparator is connected to the second input terminal of the counting subunit, and the second comparator is used to control the counting subunit to count according to the comparison result of the voltage lower limit value and the first voltage.

[0016] According to some embodiments of the present application, the sampling resistance adjustable acquisition unit includes:

[0017] A plurality of sampling resistors, one end of each of the sampling resistors is connected to the secondary side of the transformer component;

[0018] A switch subunit, the other ends of the plurality of sampling resistors are all connected to the switch subunit, the resistance value adjustment unit is connected to the switch subunit, and the switch subunit is used to control the operation of any one of the plurality of sampling resistors.

[0019] The sampling resistance of the sampling resistance adjustable acquisition unit is the resistance of the sampling resistor in operation.

[0020] According to some embodiments of the present application, it further includes:

[0021] The absolute value unit, the sampling resistance adjustable acquisition unit is connected to the absolute value unit, the absolute value unit is connected to the resistance adjustment unit, and the absolute value unit is used to process the absolute value of the first voltage and output it to the resistance adjustment unit.

[0022] According to some embodiments of the present application, the absolute value unit includes:

[0023] A reverse amplifying subunit, the reverse amplifying subunit is connected to the sampling resistance adjustable acquisition unit, and the reverse amplifying subunit is used to obtain a second voltage according to the first voltage when the first voltage is a positive voltage, and output the second voltage, wherein the second voltage is negative twice of the first voltage;

[0024] A reverse adding subunit, the reverse adding subunit is connected to the reverse amplifying subunit, the reverse adding subunit is connected to the sampling resistance adjustable acquisition unit, the reverse adding subunit is used for, when the first voltage is a positive voltage, summing the first voltage and the second voltage to obtain a summed voltage, and then performing reverse processing on the summed voltage and outputting it to the resistance adjusting unit, and when the first voltage is a negative voltage, performing reverse processing on the first voltage and outputting it to the resistance adjusting unit.

[0025] According to some embodiments of the present application, the reverse amplification subunit includes:

[0026] A first resistor, wherein the sampling resistance adjustable acquisition unit is connected to one end of the first resistor;

[0027] a first operational amplifier, wherein the other end of the first resistor is connected to an inverting input terminal of the first operational amplifier, and a non-inverting input terminal of the first operational amplifier is grounded;

[0028] a first diode, wherein the output end of the first operational amplifier is connected to the anode of the first diode, and the cathode of the first diode is connected to the inverting input end of the first operational amplifier;

[0029] a second diode, wherein the output end of the first operational amplifier is connected to the cathode of the second diode;

[0030] a second resistor, wherein the anode of the second diode is connected to one end of the second resistor, and the other end of the second resistor is connected to the inverting input end of the first operational amplifier;

[0031] A third resistor, wherein the anode of the second diode is connected to one end of the third resistor, and the other end of the third resistor is connected to the reverse adding subunit.

[0032] According to some embodiments of the present application, the reverse addition subunit includes:

[0033] A second operational amplifier, wherein the reverse amplification subunit is connected to an inverting input terminal of the second operational amplifier, a non-inverting input terminal of the second operational amplifier is grounded, and an output terminal of the second operational amplifier is connected to the resistance adjustment unit;

[0034] a fourth resistor, one end of which is connected to the sampling resistance adjustable acquisition unit, and the other end of which is connected to the inverting input end of the second operational amplifier;

[0035] A fifth resistor, one end of the fifth resistor is connected to the inverting input end of the second operational amplifier, and the other end of the fifth resistor is connected to the output end of the second operational amplifier.

[0036] According to some embodiments of the present application, it further includes:

[0037] A high-voltage sampling unit, the high-voltage sampling unit is connected to the second operational amplifier, the high-voltage sampling unit is used to collect a third voltage and output it to the inverting input terminal of the second operational amplifier, so as to use the third voltage to correct the first voltage, and the third voltage is the output terminal voltage of the secondary side of the transformer component.

[0038] According to some embodiments of the present application, it further includes:

[0039] A triode, wherein the collector of the triode is used to connect to a low-voltage power supply, and the emitter of the triode is connected to the primary side of the transformer assembly;

[0040] A first error amplifier, wherein the non-inverting input terminal of the first error amplifier is used to input a preset target voltage, the inverting input terminal of the first error amplifier is connected to the high-voltage sampling unit, the output terminal of the first error amplifier is connected to the base of the transistor, and the first error amplifier is used to adjust the base voltage of the transistor according to the error between the third voltage and the preset target voltage, thereby adjusting the input voltage of the primary side of the transformer component, so that the output terminal of the secondary side of the transformer component stably outputs the preset target voltage.

[0041] In a second aspect, an embodiment of the present application provides a high-voltage power supply, including a current sampling circuit as described above.

[0042] In the embodiment of the present application, the voltage on the secondary side of the transformer assembly is collected by the sampling resistance adjustable collection unit, and the resistance adjustment unit controls the dynamic change of the sampling resistance of the sampling resistance adjustable collection unit according to the voltage collected by the sampling resistance adjustable collection unit, until the sampling resistance of the sampling resistance adjustable collection unit is adjusted to be stable, and the current of the nuclear radiation detector can be calculated according to the sampling resistance adjusted to the stable sampling resistance by the sampling resistance adjustable collection unit and the voltage collected by the sampling resistance adjustable collection unit at the target resistance. Compared with the traditional nuclear radiation detector measurement technology, the embodiment of the present application can perform high-precision sampling of the current of the nuclear radiation detector without using an independent current measurement device.

[0043] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0045] Figure 1 A functional block diagram of an embodiment of a current sampling circuit provided by the present application;

[0046] Figure 2 A circuit diagram of a sampling resistance adjustable acquisition unit and a resistance adjustment unit in an embodiment of a current sampling circuit provided in the present application;

[0047] Figure 3 A circuit diagram of an absolute value unit in an embodiment of a current sampling circuit provided by the present application;

[0048] Figure 4 A circuit diagram of a first error amplifier and a first current limiting unit in an embodiment of a current sampling circuit provided by the present application;

[0049] Figure 5 This is a circuit diagram of a voltage doubler rectifying unit and a filter unit in an embodiment of a current sampling circuit provided in the present application.

[0050] Reference numerals:

[0051] Window comparison subunit 100, counting subunit 110, decoding subunit 120, switch subunit 130, absolute value unit 140, reverse amplification subunit 150, reverse addition subunit 160, high-voltage sampling unit 170, second current limiting unit 180, first current limiting unit 190, voltage doubling rectifier unit 200, filtering unit 210, proportional amplification unit 220, oscillator 230. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0053] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In the description of this application, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0055] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0056] Refer to the following Figures 1 to 5 A current sampling circuit and a high-voltage power supply for collecting nuclear radiation detector signals according to an embodiment of the present application are described.

[0057] The embodiment of the present application provides a current sampling circuit, which is arranged in a nuclear radiation detector including a high-voltage power supply, the high-voltage power supply including a transformer component T1, and the current sampling circuit includes:

[0058] The sampling resistance adjustable acquisition unit is connected to the secondary side of the transformer component T1, and is used to collect the voltage on the secondary side of the transformer component T1 and output the collected voltage;

[0059] A resistance adjustment unit, the resistance adjustment unit is connected to the sampling resistance adjustable acquisition unit, and the resistance adjustment unit is used to control the dynamic change of the sampling resistance of the sampling resistance adjustable acquisition unit according to the first voltage, until the sampling resistance of the sampling resistance adjustable acquisition unit is adjusted to be stable, and the first voltage is the voltage collected by the sampling resistance adjustable acquisition unit;

[0060] Among them, the current of the nuclear radiation detector is the ratio between the target voltage Vsi and the target resistance, the target resistance is the sampling resistance adjusted to a stable sampling resistance by the sampling resistance adjustable acquisition unit, and the target voltage Vsi is the voltage collected by the sampling resistance adjustable acquisition unit at the target resistance.

[0061] In the embodiment of the present application, the voltage on the secondary side of the transformer component T1 is collected by the sampling resistance adjustable collection unit, and the resistance adjustment unit controls the dynamic change of the sampling resistance of the sampling resistance adjustable collection unit according to the voltage collected by the sampling resistance adjustable collection unit, until the sampling resistance of the sampling resistance adjustable collection unit is adjusted to be stable, and the current of the nuclear radiation detector can be calculated according to the sampling resistance adjusted to the stable sampling resistance by the sampling resistance adjustable collection unit and the voltage collected by the sampling resistance adjustable collection unit at the target resistance. Compared with the traditional nuclear radiation detector measurement technology, the embodiment of the present application can perform high-precision sampling of the current of the nuclear radiation detector without using an independent current measurement device.

[0062] The transformer assembly T1 includes a transformer. The sampling resistance adjustable acquisition unit can use a variable resistor to collect the voltage on the secondary side of the transformer assembly T1. Under the control of the resistance adjustment unit, the variable resistor can realize the dynamic change of the sampling resistance, thereby changing the sampling range.

[0063] It should be noted that the resistance adjustment unit can use an MCU, and the MCU controls the dynamic change of the sampling resistance of the sampling resistance adjustable acquisition unit according to the first voltage until the first voltage is within the working voltage range of the sampling resistance adjustable acquisition unit and the sampling resistance is stable. The sampling accuracy of the sampling resistance adjustable acquisition unit can be improved, and the sampling resistance adjustable acquisition unit can be prevented from being burned out due to an excessively large first voltage.

[0064] In one embodiment of the present application, Figure 1 As shown, the resistance adjustment unit includes:

[0065] The window comparison subunit 100, the sampling resistance adjustable acquisition unit is connected to the window comparison subunit 100, and the window comparison subunit 100 is used to confirm whether the first voltage is within the preset voltage range, and output a control signal if the first voltage is not within the preset voltage range;

[0066] The counting subunit 110, the window comparison subunit 100 is connected to the counting subunit 110, and the counting subunit 110 is used to count when receiving a control signal;

[0067] The decoding subunit 120 is connected to the counting subunit 110 , and the decoding subunit 120 is connected to the sampling resistance adjustable acquisition unit. The decoding subunit 120 is used to control the sampling resistance change of the sampling resistance adjustable acquisition unit according to the counting value of the counting subunit 110 .

[0068] In this embodiment, the preset voltage range is the working voltage range of the sampling resistance adjustable acquisition unit. The window comparison subunit 100 determines whether the first voltage is within the preset voltage range. If the first voltage is not within the preset voltage range, a control signal is output to the counting subunit 110. The counting subunit 110 counts according to the control signal, thereby changing the count value. The decoding subunit 120 controls the sampling resistance of the sampling resistance adjustable acquisition unit according to the count value to adjust the sampling resistance. When the first voltage changes with the sampling resistance until it is within the preset voltage range, the window comparison subunit 100 does not output a control signal, and the count value of the counting subunit 110 remains unchanged. Therefore, the decoding subunit 120 does not adjust the count value to control the sampling resistance of the sampling resistance adjustable acquisition unit, and the sampling resistance is stable.

[0069] The window comparison subunit 100 can use a window comparator, set the upper threshold of the window comparator to the upper voltage limit of the preset voltage range, and set the lower threshold of the window comparator to the lower voltage limit of the preset voltage range, and use the window comparator to determine whether the first voltage is between the upper threshold and the lower threshold.

[0070] The counting subunit 110 can control the delay time of each change of the sampling resistance value by counting the length, and after waiting for the delay time of the sampling resistance value changing once, the decoding subunit 120 performs decoding to collect the current under the corresponding sampling range.

[0071] It should be noted that if Figure 2 As shown, the counting subunit 110 includes a counter U1, the output end of the window comparison subunit 100 is connected to the input end of the counter U1, and the output end of the counter U1 is connected to the input end of the decoding subunit 120. The counter U1 counts according to the control signal output by the window comparison subunit 100, and outputs the count value to the decoding subunit 120 through the output end.

[0072] like Figure 2 As shown, the counter U1 has multiple output terminals, and the multiple output terminals of the counter U1 are all connected to the decoding subunit 120, and the count value is output to the decoding subunit 120 through the multiple output terminals. The counting subunit 110 also includes an AND gate module U3, and the AND gate module U3 has multiple input terminals. The multiple output terminals of the counter U1 are correspondingly connected to the multiple input terminals of the AND gate module U3, and the output terminal of the AND gate module U3 is connected to the reset terminal of the counter U1. The counter U1 counts cyclically between multiple count values. When the multiple output terminals of the counter U1 are all high levels, it indicates that each count value has been counted, and the output terminal of the AND gate module U3 outputs a high level to the reset terminal of the counter U1, so that the counter U1 is reset and starts counting again. The AND gate module U3 includes an AND gate logic circuit. The model used by the counter U1 can be SN74HC193D.

[0073] The decoding subunit 120 may use a decoder U2, and the model of the decoder U2 may be SN74HC138D.

[0074] In one embodiment of the present application, Figure 2 As shown, the window comparison subunit 100 includes:

[0075] A first comparator A1, a sampling resistance adjustable acquisition unit connected to a non-inverting input terminal of the first comparator A1, an inverting input terminal of the first comparator A1 for inputting a voltage upper limit value of a preset voltage range, an output terminal of the first comparator A1 connected to a first input terminal of the counting subunit 110, and the first comparator A1 is used to control the counting subunit 110 to count according to a comparison result of the voltage upper limit value and the first voltage;

[0076] The second comparator A2, the non-inverting input terminal of the second comparator A2 is used to input the voltage lower limit value of the preset voltage range, the inverting input terminal of the second comparator A2 is connected to the sampling resistance adjustable acquisition unit, the output terminal of the second comparator A2 is connected to the second input terminal of the counting subunit 110, and the second comparator A2 is used to control the counting subunit 110 to count according to the comparison result of the voltage lower limit value and the first voltage.

[0077] In this embodiment, the voltage upper limit value of the preset voltage range is compared with the first voltage by the first comparator A1. When the first voltage is greater than the voltage upper limit value, the first comparator A1 outputs a high level to the counting subunit 110, so that the counting subunit 110 counts up. The voltage lower limit value of the preset voltage range is compared with the first voltage by the second comparator A2. When the voltage lower limit value is greater than the voltage lower limit value, the second comparator A2 outputs a high level to the counting subunit 110, so that the counting subunit 110 counts down.

[0078] In one embodiment of the present application, Figure 1 As shown, the sampling resistance adjustable acquisition unit includes:

[0079] A plurality of sampling resistors Rs, one end of each of the plurality of sampling resistors Rs is connected to the secondary side of the transformer component T1;

[0080] The switch subunit 130, the other ends of the multiple sampling resistors Rs are all connected to the switch subunit 130, the resistance adjustment unit is connected to the switch subunit 130, and the switch subunit 130 is used to control any one of the multiple sampling resistors Rs to work.

[0081] The sampling resistance of the sampling resistance adjustable acquisition unit is the resistance of the sampling resistor Rs in operation.

[0082] In this embodiment, the plurality of sampling resistors Rs have different resistance values, and the plurality of sampling resistors Rs correspond to a plurality of ranges. The resistance value adjustment unit can turn on any one of the plurality of sampling resistors Rs by controlling the switch subunit 130, so that the turned-on sampling resistor Rs works, and the resistance value of the turned-on sampling resistor Rs is the sampling resistance value of the sampling resistance adjustable acquisition unit.

[0083] like Figure 2 As shown, the switch subunit 130 includes a plurality of relays, and the plurality of relays correspond to the plurality of sampling resistors Rs one by one, and the plurality of relays are correspondingly connected to the plurality of sampling resistors Rs. The resistance value adjustment unit is respectively connected to the control ends of the plurality of relays, and can respectively control the on and off states of the plurality of relays, thereby being able to control any one of the plurality of sampling resistors Rs to work.

[0084] An embodiment of the present application further includes:

[0085] Absolute value unit 140, sampling resistance adjustable acquisition unit is connected to the absolute value unit 140, the absolute value unit 140 is connected to the resistance adjustment unit, and the absolute value unit 140 is used to process the absolute value of the first voltage and output it to the resistance adjustment unit.

[0086] In this embodiment, the absolute value unit 140 can perform absolute value processing on the first voltage output by the sampling resistance adjustable acquisition unit, and then output the first voltage after the absolute value processing, that is, output the target voltage Vsi.

[0087] The absolute value unit 140 may adopt a full-wave rectification circuit.

[0088] In one embodiment of the present application, Figures 1 to 2 As shown, the absolute value unit 140 includes:

[0089] A reverse amplifying subunit 150, the reverse amplifying subunit 150 is connected to the sampling resistance adjustable acquisition unit, and is used for obtaining a second voltage according to the first voltage when the first voltage is a positive voltage, and outputting the second voltage, wherein the second voltage is negative twice of the first voltage;

[0090] The reverse adding subunit 160 is connected to the reverse amplifying subunit 150, and is connected to the sampling resistance adjustable acquisition unit. The reverse adding subunit 160 is used for summing the first voltage and the second voltage to obtain a summed voltage when the first voltage is a positive voltage, and then performing reverse processing on the summed voltage and outputting it to the resistance adjusting unit. When the first voltage is a negative voltage, the first voltage is reversely processed and outputted to the resistance adjusting unit.

[0091] In this embodiment, when the first voltage output by the sampling resistance adjustable acquisition unit is a positive voltage, the reverse amplification subunit 150 obtains a second voltage according to the first voltage, and outputs the second voltage, the second voltage being negative twice the first voltage, the reverse addition subunit 160 sums the first voltage and the second voltage to obtain a summed voltage, and then performs reverse processing on the summed voltage before outputting it, so the first voltage remains unchanged, and the voltage output by the reverse addition subunit 160 to the resistance adjustment unit is still the first voltage. When the first voltage output by the sampling resistance adjustable acquisition unit is a negative voltage, the reverse amplification subunit 150 does not process the first voltage, the reverse amplification subunit 150 outputs a voltage of 0, the reverse addition subunit 160 performs reverse processing on the first voltage before outputting it, so that the first voltage becomes a positive voltage, and the voltage output by the reverse addition subunit 160 to the resistance adjustment unit is the first voltage converted to a positive voltage.

[0092] In one embodiment of the present application, Figure 3 As shown, the reverse amplification subunit 150 includes:

[0093] A first resistor R1, a sampling resistance adjustable acquisition unit is connected to one end of the first resistor R1;

[0094] A first operational amplifier A3, the other end of the first resistor R1 is connected to an inverting input terminal of the first operational amplifier A3, and a non-inverting input terminal of the first operational amplifier A3 is grounded;

[0095] A first diode D1, an output end of the first operational amplifier A3 is connected to the anode of the first diode D1, and a cathode of the first diode D1 is connected to the inverting input end of the first operational amplifier A3;

[0096] A second diode D2, the output end of the first operational amplifier A3 is connected to the cathode of the second diode D2;

[0097] A second resistor R2, an anode of the second diode D2 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the inverting input end of the first operational amplifier A3;

[0098] The third resistor R4 and the anode of the second diode D2 are connected to one end of the third resistor R4 , and the other end of the third resistor R4 is connected to the reverse adding sub-unit 160 .

[0099] In this embodiment, when the first voltage is a positive voltage, the first diode D1 is turned off, the second diode D2 is turned on, the first resistor R1, the second resistor R2, the third resistor R4 and the first operational amplifier A3 jointly amplify the first voltage, and by setting the proportional relationship between the first resistor R1, the second resistor R2 and the third resistor R4, the first voltage is amplified twice and reversed to obtain the second voltage, and the second voltage is output by the third resistor R4 to the reverse adding subunit 160. When the first voltage is a negative voltage, the first diode D1 is turned on, the second diode D2 is turned off, and at this time, the first operational amplifier A3 clamps the voltage of one end of the second resistor R2 to 0, and the voltage of one end of the third resistor R4 is 0 under the feedback of the reverse adding subunit 160, so that no current passes through the reverse amplifying subunit 150 and it does not work.

[0100] In one embodiment of the present application, Figure 3 As shown, the reverse addition subunit 160 includes:

[0101] The second operational amplifier A4, the reverse amplifier subunit 150 is connected to the inverting input terminal of the second operational amplifier A4, the non-inverting input terminal of the second operational amplifier A4 is grounded, and the output terminal of the second operational amplifier A4 is connected to the resistance adjustment unit;

[0102] A fourth resistor R3, one end of the fourth resistor R3 is connected to the sampling resistance adjustable acquisition unit, and the other end of the fourth resistor R3 is connected to the inverting input end of the second operational amplifier A4;

[0103] A fifth resistor R5 , one end of the fifth resistor R5 is connected to the inverting input end of the second operational amplifier A4 , and the other end of the fifth resistor R5 is connected to the output end of the second operational amplifier A4 .

[0104] In the embodiment of the present application, by setting the proportional relationship between the fourth resistor R3 and the fifth resistor R5, the second operational amplifier A4, the fourth resistor R3 and the fifth resistor R5 work together to play a reverse role. When the first voltage is a positive voltage, the reverse adding subunit 160 sums the first voltage and the second voltage to obtain a summed voltage, and then performs reverse processing on the summed voltage and outputs it to the resistance adjusting unit. When the first voltage is a negative voltage, the first voltage is reversely processed and output to the resistance adjusting unit.

[0105] In one embodiment of the present application, Figure 1 As shown, it also includes:

[0106] The high-voltage sampling unit 170 is connected to the second operational amplifier A4. The high-voltage sampling unit 170 is used to collect the third voltage HV and output it to the inverting input terminal of the second operational amplifier A4, so as to correct the first voltage using the third voltage HV. The third voltage HV is the output terminal voltage of the secondary side of the transformer component T1.

[0107] In the embodiment of the present application, since the sampling resistance adjustable acquisition unit connected to the secondary side of the transformer component T1 consumes current, the first voltage is corrected by the output terminal voltage of the secondary side of the transformer component T1, so that the subsequently obtained target voltage Vsi is more accurate, thereby making the result obtained by calculating the current of the nuclear radiation detector using the target voltage Vsi more accurate.

[0108] The output terminal of the secondary side of the transformer component T1 is used to connect a load.

[0109] like Figure 4 As shown, the high-voltage sampling unit 170 includes a voltage follower A5, which is connected to the output end of the secondary side of the transformer component T1, and the voltage follower A5 is connected to the inverting input end of the second operational amplifier A4. The voltage follower A5 outputs the third voltage HV to the inverting input end of the second operational amplifier A4.

[0110] In one embodiment of the present application, Figure 1 As shown, it also includes:

[0111] Transistor Q1, the collector of the transistor Q1 is used to connect to the low voltage power supply, and the emitter of the transistor Q1 is connected to the primary side of the transformer component T1;

[0112] The first error amplifier A6, such as Figure 4 As shown, the non-inverting input terminal of the first error amplifier A6 is used to input a preset target voltage Vset, the inverting input terminal of the first error amplifier A6 is connected to the high-voltage sampling unit 170, and the output terminal of the first error amplifier A6 is connected to the base of the transistor Q1. The first error amplifier A6 is used to adjust the base voltage of the transistor Q1 according to the error between the third voltage HV and the preset target voltage Vset, thereby adjusting the input voltage on the primary side of the transformer component T1, so that the output terminal on the secondary side of the transformer component T1 stably outputs the preset target voltage Vset.

[0113] In this embodiment, the low-voltage power supply provides voltage to the primary side of the transformer component T1 through the transistor Q1, and the first error amplifier A6 adjusts the base voltage of the transistor Q1 according to the error between the third voltage HV and the preset target voltage Vset, thereby adjusting the input voltage of the primary side of the transformer component T1, so that the output end of the secondary side of the transformer component T1 stably outputs the preset target voltage Vset.

[0114] The collector of the transistor Q1 is connected to the low voltage power supply through the second current limiting unit 180, and the second current limiting unit 180 can play a role in current limiting protection. The second current limiting unit 180 can adopt a MOS tube current limiting protection circuit.

[0115] In one embodiment of the present application, Figure 1As shown, it also includes:

[0116] The proportional amplification unit 220 includes a third operational amplifier A8. The output end of the first error amplifier A6 is connected to the non-inverting input end of the third operational amplifier A8. The output end of the third operational amplifier A8 is connected to the base of the transistor Q1.

[0117] In this embodiment, the third operational amplifier A8 gains the voltage of the first error amplifier A6 and inputs the voltage to the base of the transistor Q1 , thereby adjusting the input voltage of the primary side of the transformer component T1 by controlling the transistor Q1 .

[0118] In one embodiment of the present application, Figure 1 As shown, it also includes:

[0119] The first current limiting unit 190 has an input end connected to the output end of the second operational amplifier A4, and an output end of the first current limiting unit 190 connected to the non-inverting input end of the third operational amplifier A8.

[0120] In this embodiment, the output terminal of the second operational amplifier A4 is connected to the non-inverting input terminal of the third operational amplifier A8 through the first current limiting unit 190, and the first current limiting unit 190 plays a role in short-circuit current protection.

[0121] like Figure 4 As shown, the first current limiting unit 190 includes a second error amplifier A7 and a third diode D3, the inverting input terminal of the second error amplifier A7 is connected to the absolute value unit 140, the non-inverting input terminal of the second error amplifier A7 is used to input a preset reference voltage, the output terminal of the second error amplifier A7 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the non-inverting input terminal of the second error amplifier A7. The second error amplifier A7 calculates the error between the target voltage Vsi output by the absolute value unit 140 and the preset reference voltage, and outputs it to the third diode D3. If the error between the target voltage Vsi and the preset reference voltage is large, the output terminal voltage of the second error amplifier A7 breaks through the third diode D3, and the output terminal voltage of the second error amplifier A7 will be output to the non-inverting input terminal of the third operational amplifier A8, and output to the base of the transistor Q1 after gain through the third operational amplifier A8, so as to adjust the input voltage of the primary side of the transformer component T1 by controlling the transistor Q1, and reduce the output current of the transformer component T1.

[0122] In one embodiment of the present application, Figure 1 As shown, the high voltage power supply also includes:

[0123] The voltage doubler rectifying unit 200 , the secondary side of the transformer component T1 is connected to the voltage doubler rectifying unit 200 .

[0124] In this embodiment, the voltage doubling rectifier unit 200 can amplify the voltage on the secondary side of the transformer component T1 by multiples and then output it.

[0125] like Figure 5 As shown, the voltage doubler rectifier unit 200 includes a first capacitor C5, a second capacitor C6, a fourth diode D4 and a fifth diode D5. One end of the secondary side of the transformer component T1 is connected to one end of the first capacitor C5, the other end of the first capacitor C5 is connected to the positive electrode of the fifth diode D5, the other end of the secondary side of the transformer component T1 is connected to the positive electrode of the fourth diode D4, the negative electrode of the fourth diode D4 is connected to the positive electrode of the fifth diode D5, the negative electrode of the fifth diode D5 is connected to one end of the second capacitor C6, and the other end of the second capacitor C6 is connected to the other end of the secondary side of the transformer component T1.

[0126] In one embodiment of the present application, Figure 1 As shown, the high voltage power supply also includes:

[0127] The filter unit 210 is connected to the voltage doubler and rectifier unit 200 .

[0128] In this embodiment, the filtering unit 210 can filter the high voltage signal output by the voltage doubling and rectifying unit 200 and then output the signal.

[0129] like Figure 5 As shown, the filtering unit 210 adopts a high-voltage low-pass filtering circuit, which includes a sixth resistor R17, a seventh resistor R18, an eighth resistor R19, a third capacitor C7 and a fourth capacitor C8. One end of the second capacitor C6 is connected to one end of the sixth resistor R17, the other end of the sixth resistor R17 is connected to one end of the third capacitor C7, and the other end of the second capacitor C6 is connected to the other end of the third capacitor C7. One end of the third capacitor C7 is connected to one end of the seventh resistor R18, the other end of the seventh resistor R18 is connected to one end of the fourth capacitor C8, and the other end of the fourth capacitor C8 is connected to the other end of the third capacitor C7. The other end of the seventh resistor R18 is connected to one end of the eighth resistor R19, and the other end of the eighth resistor R19 is used to output a filtered high-voltage signal, and the filtered high-voltage signal is the third voltage HV.

[0130] In one embodiment of the present application, Figure 1 As shown, the high voltage power supply also includes:

[0131] The chopper circuit is connected to the primary side of the transformer component T1.

[0132] In this embodiment, the chopper circuit chops the voltage on the primary side of the transformer component T1 to convert it into a pulse voltage.

[0133] The chopper circuit includes an oscillator 230 and a switch tube Q2, wherein the input end of the switch tube Q2 is connected to the primary side of the transformer component T1, the output end of the switch tube Q2 is grounded, and the output end of the oscillator 230 is connected to the control end of the switch tube Q2. The switch tube Q2 can be a MOS tube. The model used by the oscillator 230 can be NE555D.

[0134] In addition, an embodiment of the present application further provides a high voltage power supply, including the current sampling circuit as described above.

[0135] The nuclear radiation detector provided in the embodiment of the present application can implement each process implemented by the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0136] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A current sampling circuit for collecting nuclear radiation detector signals, characterized in that: It is arranged in a nuclear radiation detector including a high-voltage power supply, wherein the high-voltage power supply includes a transformer component, and the current sampling circuit includes: A sampling resistance adjustable acquisition unit is connected to the secondary side of the transformer assembly, and the sampling resistance adjustable acquisition unit is used to collect the voltage of the secondary side of the transformer assembly and output the collected voltage; A resistance adjustment unit connected to the sampling resistance adjustable acquisition unit, the resistance adjustment unit is used to control the dynamic change of the sampling resistance of the sampling resistance adjustable acquisition unit according to a first voltage until the sampling resistance of the sampling resistance adjustable acquisition unit is adjusted to be stable, and the first voltage is the voltage collected by the sampling resistance adjustable acquisition unit; Among them, the current of the nuclear radiation detector is the ratio between the target voltage and the target resistance, the target resistance is the sampling resistance adjusted to a stable resistance by the sampling resistance adjustable acquisition unit, and the target voltage is the voltage collected by the sampling resistance adjustable acquisition unit at the target resistance.

2. The current sampling circuit according to claim 1, characterized in that: The resistance adjustment unit comprises: A window comparison subunit, wherein the sampling resistance adjustable acquisition unit is connected to the window comparison subunit, and the window comparison subunit is used to confirm whether the first voltage is within a preset voltage range, and output a control signal if the first voltage is not within the preset voltage range; a counting subunit, the window comparison subunit being connected to the counting subunit, and the counting subunit being used for counting when receiving the control signal; The decoding subunit is connected to the counting subunit, the decoding subunit is connected to the sampling resistance adjustable acquisition unit, and the decoding subunit is used to control the sampling resistance change of the sampling resistance adjustable acquisition unit according to the counting value of the counting subunit.

3. The current sampling circuit according to claim 2, characterized in that: The window comparison subunit comprises: A first comparator, wherein the sampling resistance adjustable acquisition unit is connected to a first input terminal of the first comparator, a second input terminal of the first comparator is used to input a voltage upper limit value of the preset voltage range, an output terminal of the first comparator is connected to a first input terminal of the counting subunit, and the first comparator is used to control the counting subunit to count according to a comparison result of the voltage upper limit value and the first voltage; A second comparator, wherein the first input terminal of the second comparator is used to input the voltage lower limit value of the preset voltage range, the second input terminal of the second comparator is connected to the sampling resistance adjustable acquisition unit, the output terminal of the second comparator is connected to the second input terminal of the counting subunit, and the second comparator is used to control the counting subunit to count according to the comparison result of the voltage lower limit value and the first voltage.

4. The current sampling circuit according to claim 1, characterized in that: The sampling resistance adjustable acquisition unit comprises: A plurality of sampling resistors, one end of each of the sampling resistors is connected to the secondary side of the transformer component; A switch subunit, the other ends of the plurality of sampling resistors are all connected to the switch subunit, the resistance value adjustment unit is connected to the switch subunit, and the switch subunit is used to control the operation of any one of the plurality of sampling resistors. The sampling resistance of the sampling resistance adjustable acquisition unit is the resistance of the sampling resistor in operation.

5. The current sampling circuit according to claim 1, characterized in that: Also includes: The absolute value unit, the sampling resistance adjustable acquisition unit is connected to the absolute value unit, the absolute value unit is connected to the resistance adjustment unit, and the absolute value unit is used to process the absolute value of the first voltage and output it to the resistance adjustment unit.

6. The current sampling circuit according to claim 5, characterized in that: The absolute value unit comprises: A reverse amplifying subunit, the reverse amplifying subunit is connected to the sampling resistance adjustable acquisition unit, and the reverse amplifying subunit is used to obtain a second voltage according to the first voltage when the first voltage is a positive voltage, and output the second voltage, wherein the second voltage is negative twice of the first voltage; A reverse adding subunit, the reverse adding subunit is connected to the reverse amplifying subunit, the reverse adding subunit is connected to the sampling resistance adjustable acquisition unit, the reverse adding subunit is used for, when the first voltage is a positive voltage, summing the first voltage and the second voltage to obtain a summed voltage, and then performing reverse processing on the summed voltage and outputting it to the resistance adjusting unit, and when the first voltage is a negative voltage, performing reverse processing on the first voltage and outputting it to the resistance adjusting unit.

7. The current sampling circuit according to claim 6, characterized in that: The reverse amplification subunit comprises: A first resistor, wherein the sampling resistance adjustable acquisition unit is connected to one end of the first resistor; a first operational amplifier, wherein the other end of the first resistor is connected to an inverting input terminal of the first operational amplifier, and a non-inverting input terminal of the first operational amplifier is grounded; a first diode, wherein the output end of the first operational amplifier is connected to the anode of the first diode, and the cathode of the first diode is connected to the inverting input end of the first operational amplifier; a second diode, wherein the output end of the first operational amplifier is connected to the cathode of the second diode; a second resistor, wherein the anode of the second diode is connected to one end of the second resistor, and the other end of the second resistor is connected to the inverting input end of the first operational amplifier; A third resistor, wherein the anode of the second diode is connected to one end of the third resistor, and the other end of the third resistor is connected to the reverse adding subunit.

8. The current sampling circuit according to claim 6, characterized in that: The reverse addition subunit includes: A second operational amplifier, wherein the reverse amplifying subunit is connected to an inverting input terminal of the second operational amplifier, a non-inverting input terminal of the second operational amplifier is grounded, and an output terminal of the second operational amplifier is connected to the resistance adjusting unit; a fourth resistor, one end of which is connected to the sampling resistance adjustable acquisition unit, and the other end of which is connected to the inverting input end of the second operational amplifier; A fifth resistor, one end of the fifth resistor is connected to the inverting input end of the second operational amplifier, and the other end of the fifth resistor is connected to the output end of the second operational amplifier.

9. The current sampling circuit according to claim 8, characterized in that: Also includes: A high-voltage sampling unit, the high-voltage sampling unit is connected to the second operational amplifier, the high-voltage sampling unit is used to collect a third voltage and output it to the inverting input terminal of the second operational amplifier, so as to use the third voltage to correct the first voltage, and the third voltage is the output terminal voltage of the secondary side of the transformer component.

10. The current sampling circuit according to claim 9, characterized in that: Also includes: A triode, wherein the collector of the triode is used to connect to a low-voltage power supply, and the emitter of the triode is connected to the primary side of the transformer assembly; A first error amplifier, wherein the non-inverting input terminal of the first error amplifier is used to input a preset target voltage, the inverting input terminal of the first error amplifier is connected to the high-voltage sampling unit, the output terminal of the first error amplifier is connected to the base of the transistor, and the first error amplifier is used to adjust the base voltage of the transistor according to the error between the third voltage and the preset target voltage, thereby adjusting the input voltage of the primary side of the transformer component, so that the output terminal of the secondary side of the transformer component stably outputs the preset target voltage.

11. A high voltage power supply, characterized in that: The method comprises the current sampling circuit as claimed in any one of claims 1 to 10.

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