Signal acquisition circuit and device

Abstract

The utility model relates to a signal acquisition circuit and device, and the circuit comprises a signal interface which is used for the access of a signal to be acquired, and the signal to be acquired comprises a high-voltage control signal, a low-voltage control signal, and a dry contact signal; the acquisition unit is used for outputting a state indication signal capable of representing the state of the to-be-acquired signal when the to-be-acquired signal is received; the high-impedance acquisition channel is connected between the signal interface and the acquisition unit and is conducted when the signal to be acquired is a high-voltage control signal; the low-impedance acquisition channel is connected between the signal interface and the acquisition unit and is conducted when the signal to be acquired is a low-voltage control signal; and the dry contact acquisition channel is connected between the signal interface and the acquisition unit and is used for conducting when the to-be-acquired signal is a dry contact signal. According to the utility model, various types of equipment control signals can be acquired, the circuit structure is simple, the size and the weight are small, the portability is strong, and the acquisition efficiency of the control signals can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nuclear power plant equipment overhauling technical field especially relates to signal acquisition circuit and device. BACKGROUND

[0002] Nuclear power plant generates on-site to have various equipment control signals, such as 48V control signal, 24V control signal, dry contact signal (namely passive switch signal) etc., and in the overhauling process, staff usually needs special equipment to collect equipment control signal, can determine whether the transmission signal between equipment is normal according to actual working condition. But because the type of equipment control signal is different, leads to obvious difference such as working voltage or signal characteristic, leads to needing to use different acquisition equipment when collecting different equipment control signals, and the compatibility of different acquisition equipment is different, when staff attention is insufficient, error is easy, for example, using the equipment that collects 48V control signal to collect 24V control signal or dry contact signal, thus leading to instrument or equipment overvoltage damage, influence the safety of nuclear power plant. SUMMARY

[0003] The utility model solves the technical problem in at, provide a kind of signal acquisition circuit and device.

[0004] The utility model solves the technical problem and adopts the technical scheme that a kind of signal acquisition circuit is structured, comprising:

[0005] Signal interface, the signal interface is used to access signal to be collected, wherein the signal to be collected includes high voltage control signal, low voltage control signal and dry contact signal;

[0006] Acquisition unit is used to output the state indication signal capable of representing the state of the signal to be collected when receiving the signal to be collected;

[0007] High-impedance acquisition channel is connected between the signal interface and the acquisition unit, and is used to be conducted when the signal to be collected is the high voltage control signal;

[0008] Low-impedance acquisition channel is connected between the signal interface and the acquisition unit, and is used to be conducted when the signal to be collected is the low voltage control signal;And

[0009] Dry contact acquisition channel is connected between the signal interface and the acquisition unit, and is used to be conducted when the signal to be collected is the dry contact signal.

[0010] Preferably, the high-impedance acquisition channel includes a first switch, a first resistive unit and a second resistive unit;

[0011] The first end of the first switch is connected to the positive end of the signal interface, the second end of the first switch is connected to the negative end of the signal interface through the first resistive unit, the second resistive unit and the acquisition unit, and the first switch is turned on when the signal to be acquired is the high-voltage control signal.

[0012] Preferably, the low-impedance acquisition channel comprises a second switch;

[0013] The second switch is connected in parallel with the second resistive unit, and the second switch and the first switch are turned on when the signal to be acquired is the low-voltage control signal.

[0014] Preferably, the dry contact acquisition channel comprises a third switch, a fourth switch, a fifth switch and a sixth switch;

[0015] The first end of the third switch is connected to a first direct current voltage, the second end of the third switch is connected to the positive end of the signal interface, the negative end of the signal interface is connected to a connection node between the acquisition unit and the second resistive unit through the fourth switch, the sixth switch connects the acquisition unit and the negative end of the signal interface, and a node connected between the sixth switch and the acquisition unit is also connected to the fifth switch. The third switch, the fourth switch and the fifth switch are turned on and the sixth switch is turned off when the signal to be acquired is the dry contact signal, and the third switch, the fourth switch and the fifth switch are turned off and the sixth switch is turned on when the signal to be acquired is the high-voltage control signal or the low-voltage control signal.

[0016] Preferably, the first to sixth switches respectively comprise optocoupler relays;

[0017] The input end of the optocoupler relay comprised by the first switch is connected to the positive end of the signal interface, and the output end of the optocoupler relay comprised by the first switch is connected to the first resistive unit;

[0018] The input end and the output end of the optocoupler relay comprised by the second switch are connected in parallel with the second resistive unit;

[0019] The input end of the optocoupler relay comprised by the third switch is connected to a second direct current voltage, and the output end of the optocoupler relay comprised by the third switch is connected to the positive end of the signal interface;

[0020] The input end of the optocoupler relay comprised by the fourth switch is connected to the negative end of the signal interface, and the output end of the optocoupler relay comprised by the fourth switch is connected to the connection node between the acquisition unit and the second resistive unit;

[0021] The input end of the optocoupler included in the fifth switch is connected to a connection node between the collection unit and the sixth switch, and the output end of the optocoupler included in the fifth switch is grounded.

[0022] The input end of the optocoupler included in the sixth switch is connected to the input end of the optocoupler included in the fifth switch, and the output end of the optocoupler included in the fifth switch is connected to the negative end of the signal interface.

[0023] The power supply ends of the optocouplers included in the first to sixth switches are all connected to a third direct current voltage, the ground ends of the optocouplers included in the first switch and the sixth switch are used to connect to a first control signal, the ground end of the optocoupler included in the second switch is used to connect to a second control signal, and the ground ends of the optocouplers included in the third switch, the fourth switch and the fifth switch are used to connect to a third control signal.

[0024] Preferably, the first to sixth switches further respectively include a first current-limiting resistor, and the power supply ends of the optocouplers included in the first to sixth switches are respectively connected to the third direct current voltage through the first current-limiting resistor.

[0025] Preferably, the signal collection circuit further includes an inverter, which is used to connect to a fourth control signal and output the first control signal or the third control signal.

[0026] Preferably, the collection unit includes an optocoupler and a third resistive unit.

[0027] The power supply end of the optocoupler included in the collection unit is connected to a connection node between the fourth switch and the second resistive unit, the ground end of the optocoupler included in the collection unit is connected to a connection node between the fifth switch and the sixth switch, the input end of the optocoupler included in the collection unit is connected to a fourth direct current voltage, and the output end of the optocoupler included in the collection unit is connected to the ground through the third resistive unit and outputs the state indication signal.

[0028] Preferably, the signal interface includes a fuse, a protection tube, a second current-limiting resistor, a first interface used to connect a positive pole of the signal to be collected, and a second interface used to connect a negative pole of the signal to be collected.

[0029] The first interface is connected to a first end of the fuse, a second end of the fuse corresponds to a positive end of the signal interface and is connected to the second interface through the protection tube, the second interface is further connected to a first end of the second current-limiting resistor, and a second end of the second current-limiting resistor corresponds to a negative end of the signal interface.

[0030] The utility model also constructs a kind of signal acquisition device, including the signal acquisition circuit described above.

[0031] The technical scheme of the utility model can collect various types of equipment control signals, such as high-voltage control signals, low-voltage control signals, dry contact signals, etc., has compatibility for various equipment control signals, so that the nuclear power plant staff does not need to carry various acquisition equipment to the site operation, avoids the damage of equipment or instrument caused by wrong acquisition equipment, and the utility model circuit structure is simple, small in size and weight, has the advantage of portability, facilitates the staff to carry to the scene to implement acquisition work, improves the acquisition efficiency of control signals. BRIEF DESCRIPTION OF DRAWINGS

[0032] The utility model will be further described below in combination with drawings and examples, and the drawings are as follows:

[0033] Figure 1 is the circuit structure block diagram of signal acquisition circuit in some embodiments of the utility model;

[0034] Figure 2 is the circuit principle diagram of signal acquisition circuit in some embodiments of the utility model;

[0035] Figure 3 is the circuit principle diagram of inverter in some embodiments of the utility model.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] Signal interface 1;Fuse 11;Protective tube 12;First current-limiting resistor 13;First interface 14 and second interface 15;Acquisition unit 2;Optocoupler relay 21;Third resistive unit 22;Second diode 10;High-impedance acquisition channel 3;First switch 31;First resistive unit 32;Second resistive unit 33;Low-impedance acquisition channel 4;Second switch 41;Dry contact acquisition channel 5;Third switch 51;Fourth switch 52;Fifth switch 53;Sixth switch 54;Second current-limiting resistor 6;Third current-limiting resistor 8;First diode 9. DETAILED DESCRIPTION

[0038] In order to have more clear understanding of the technical features, objects and effects of the utility model, the specific implementation mode of the utility model will be described in detail with reference to the drawings.

[0039] In the following description, it needs to be understood that the directions or position relations indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or position relations shown in the drawings, constructed and operated in a particular direction, only for the convenience of describing the technical solutions, and cannot be understood as indicating that the devices or elements indicated must have a particular direction, therefore it cannot be understood as a limitation on the utility model.

[0040] The utility model provides a kind of signal acquisition circuit, which can collect various types of device control signals, including high-voltage control signals (such as 48V control signal), low-voltage control signals (such as 24V control signal), dry contact signals, etc.

[0041] As shown in Figure 1 , the signal acquisition circuit can include a signal interface 1, an acquisition unit 2, a high-impedance acquisition channel 3, a low-impedance acquisition channel 4, and a dry contact acquisition channel 5.

[0042] The signal interface 1 is used to access the signals to be collected. Among them, the signals to be collected can include high-voltage control signals, low-voltage control signals, and dry contact signals.

[0043] In some embodiments, as shown in Figure 2 , the signal interface 1 can include a fuse 11, a protection tube 12, a third current-limiting resistor 13, a first interface 14, and a second interface 15. The first interface 14 is used to connect the positive electrode of the signal to be collected, and the second interface 15 is used to connect the negative electrode of the signal to be collected. The first interface 14 is connected to the first end of the fuse 11, the second end of the fuse 11 corresponds to the positive end of the signal interface 1, and the second end of the fuse 11 is also connected to the second interface 15 through the protection tube 12. The second interface 15 is also connected to the first end of the third current-limiting resistor 13, and the second end of the third current-limiting resistor 13 corresponds to the negative end of the signal interface 1.

[0044] Optionally, the protection tube 12 can include an electrostatic discharge diode (i.e., ESD tube) and / or a transient voltage suppression diode (i.e., TVS tube). Since some devices may generate static electricity during operation due to friction with air, when the protection tube 12 is an ESD tube, it can prevent static electricity from damaging electronic devices in the signal acquisition circuit. The TVS tube prevents surge voltage from entering the signal acquisition circuit, thereby preventing damage to electronic devices. In addition, the first current-limiting resistor 13 can include a first resistor, wherein the resistance of the first resistor ranges from 100 ohms to 1000 ohms. The first current-limiting resistor 13 limits the loop current of the signal to be collected, preventing overcurrent and protecting instruments and devices.

[0045] Please refer to Figure 1The acquisition unit 2 is connected with the high-impedance acquisition channel 3, the low-impedance acquisition channel 4 and the dry contact acquisition channel 5. The acquisition unit 2 is configured to output a state indication signal capable of representing the state of the to-be-acquired signal when receiving the to-be-acquired signal. Specifically, the to-be-acquired signal is input into the acquisition unit 2 through one of the high-impedance acquisition channel 3, the low-impedance acquisition channel 4 and the dry contact acquisition channel 5, for acquisition by the acquisition unit 2. The state indication signal can represent the state of the to-be-acquired signal by high and low levels or an analog signal. When the state indication signal is a digital signal, the state of the to-be-acquired signal can be represented by high and low levels. For example, a high level can represent that the high-voltage control signal is at a high level, the low-voltage control signal is at a high level or the dry contact signal is in a closed state. When the state indication signal is at a low level, it can represent that the high-voltage control signal is at a low level, the low-voltage control signal is at a low level or the dry contact signal is in an open state. When the state indication signal is an analog signal, the state of the to-be-acquired signal can be represented by the size of the analog quantity.

[0046] Please refer to Figure 1 The high-impedance acquisition channel 3 is connected between the signal interface 1 and the acquisition unit 2. The high-impedance acquisition channel 3 is configured to be conductive when the to-be-acquired signal is a high-voltage control signal (such as a 48V control signal), so that the acquisition unit 2 can acquire the high-voltage control signal.

[0047] In some embodiments, as shown in Figure 2 The high-impedance acquisition channel 3 can include a first switch 31, a first resistive unit 32 and a second resistive unit 33. The first end of the first switch 31 is connected to the positive terminal of the signal interface 1. The second end of the first switch 31 is connected to the negative terminal of the signal interface 1 through the first resistive unit 32, the second resistive unit 33 and the acquisition unit 2. The first switch 31 is conductive when the to-be-acquired signal is a high-voltage control signal, so that the signal interface 1, the first switch 31, the first resistive unit 32, the second resistive unit 33 and the acquisition unit 2 form a signal path, and the acquisition unit 2 acquires the high-voltage control signal.

[0048] Please refer to Figure 1 The low-impedance acquisition channel 4 is connected between the signal interface 1 and the acquisition unit 2. The low-impedance acquisition channel 4 is configured to be conductive when the to-be-acquired signal is a low-voltage control signal (such as a 24V control signal), so that the acquisition unit 2 can acquire the low-voltage control signal.

[0049] It should be noted that the pass-through impedance when the low-impedance acquisition channel 4 is turned on is less than the pass-through impedance when the high-impedance acquisition channel 3 is turned on (the impedance difference between the two is between 4300 ohms and 5100 ohms, and preferably 4700 ohms), so that after the to-be-acquired signal flows through the high-impedance acquisition channel 3, it will be stepped down, and the purpose of stepping down is to prevent damage to the subsequent circuit, and to reduce the to-be-acquired signal to a voltage range that can be detected by the acquisition unit 2, so that the acquisition unit 2 can accurately acquire the high-voltage control signal. The to-be-acquired signal flows through the low-impedance acquisition channel 4, and the amplitude of the stepped-down signal is relatively small, and the main purpose is to reduce the to-be-acquired signal to a voltage range that can be detected by the acquisition unit 2.

[0050] In some embodiments, the first resistive unit 32 and the second resistive unit 33 can respectively include a second resistor, and the resistance value of the second resistor is in a range of 4300 ohms to 5100 ohms, and preferably 4700 ohms.

[0051] In some embodiments, as shown in Figure 2 The low-impedance acquisition channel 4 can include a second switch 41, the first resistive unit 32 in the high-impedance acquisition channel 3, and the first switch 31 in the high-impedance acquisition channel 3. The second switch 41 is connected in parallel with the second resistive unit 33, and the second switch 41 and the first switch 31 are turned on when the to-be-acquired signal is a low-voltage control signal, so that the signal interface 1, the first switch 31, the first resistive unit 32, the second switch 41, and the acquisition unit 2 form a signal path, and the acquisition unit 2 obtains the low-voltage control signal.

[0052] It should be noted that in the present embodiment, the low-impedance acquisition channel 4 and the high-impedance acquisition channel 3 share the first resistive unit 32 and the first switch 31, which can simplify the circuit structure and save costs. Of course, a resistive unit and a switch can be added to replace the functions of the first resistive unit 32 and the first switch 31, specifically: the added resistive unit is connected in parallel with the first resistive unit 32, and the added switch is connected in parallel with the first switch 31, and when the low-impedance acquisition channel 4 needs to be turned on, the added switch and the second switch 41 are controlled to be turned on at the same time.

[0053] Please refer to Figure 1 The dry contact acquisition channel 5 is connected between the signal interface 1 and the acquisition unit 2, and is used to be turned on when the to-be-acquired signal is a dry contact signal, so that the acquisition unit 2 obtains the dry contact signal to perform acquisition work.

[0054] In some embodiments, as shown in Figure 2As shown, the dry contact signal acquisition channel 5 can include a third switch 51, a fourth switch 52, a fifth switch 53 and a sixth switch 54. The first end of the third switch 51 is connected to the first direct current voltage (+24V), the second end of the third switch 51 is connected to the positive end of the signal interface 1, the negative end of the signal interface 1 is connected to the connection node between the second resistive unit 33 and the acquisition unit 2 through the fourth switch 52, the sixth switch 54 connects the acquisition unit 2 and the negative end of the signal interface 1, and the node after the sixth switch 54 is connected to the acquisition unit 2 is also connected to the fifth switch 53. When the signal to be acquired is a dry contact signal, the third switch 51, the fourth switch 52 and the fifth switch 53 are turned on, and the sixth switch 54 is turned off, so that the third switch 51, the signal interface 1, the fourth switch 52, the acquisition unit 2 and the fifth switch 53 form a signal path, and the acquisition unit 2 obtains the dry contact signal. The function of the sixth switch 54 being turned off is to disconnect the connection between the acquisition unit 2 and the negative end of the signal interface 1, so as to prevent the dry contact signal from being input to the acquisition unit 2 without passing through the negative end of the signal interface 1 and the fourth switch 52, and to ensure that the acquisition unit 2 normally acquires the dry contact signal. Further, when the signal to be acquired is a high-voltage control signal or a low-voltage control signal, the third switch 51, the fourth switch 52 and the fifth switch 53 are turned off, and the sixth switch 54 is turned on, so that the high-voltage control signal or the low-voltage control signal flows back to the negative end of the signal interface 1 through the sixth switch 54, and the acquisition unit 2 can form a signal path when acquiring the high-voltage control signal or the low-voltage control signal.

[0055] In some embodiments, as shown in Figure 2 The signal acquisition circuit further includes a third current-limiting resistor 8 and a first diode 9. The third current-limiting resistor 8 is connected between the first end of the third switch 51 and the first direct current voltage (+24V). The first diode 9 is connected between the second end of the third switch 51 and the positive end of the signal interface 1, which prevents the current signal from flowing back to the second end of the third switch 51 when the signal to be acquired is a high-voltage control signal or a low-voltage control signal, thereby playing a protection role.

[0056] In some embodiments, as shown in Figure 2 The first to sixth switches 54 can respectively include optocoupler relays.

[0057] Please refer to Figure 2The input end of the opto-coupler included in the first switch 31 is connected to the positive terminal of the signal interface 1 (i.e. the second terminal of the fuse 11), and the output end of the opto-coupler included in the first switch 31 is connected to the first terminal of the first resistive unit 32. The input end and the output end of the opto-coupler included in the second switch 41 are connected in parallel to the second resistive unit 33. The input end of the opto-coupler included in the third switch 51 is connected to the second DC voltage (+24V), and the output end of the opto-coupler included in the third switch 51 is connected to the positive terminal of the signal interface 1 (i.e. the second terminal of the fuse 11). The input end of the opto-coupler included in the fourth switch 52 is connected to the negative terminal of the signal interface 1 (i.e. the second terminal of the first current-limiting resistor 13), and the output end of the opto-coupler included in the fourth switch 52 is connected to the connection node between the acquisition unit 2 and the second resistive unit 33. The input end of the opto-coupler included in the fifth switch 53 is connected to the connection node between the acquisition unit 2 and the sixth switch 54, and the output end of the opto-coupler included in the fifth switch 53 is connected to the ground. The input end of the opto-coupler included in the sixth switch 54 is connected to the input end of the opto-coupler included in the fifth switch 53, and the output end of the opto-coupler included in the fifth switch 53 is connected to the negative terminal of the signal interface 1 (i.e. the second terminal of the first current-limiting resistor 13). The power supply terminals of the opto-couplers included in the first to sixth switches 54 are connected to the third DC voltage (+5V), the ground terminal of the opto-coupler included in the first switch 31 and the sixth switch 54 is used to connect to the first control signal (the network label corresponds to / DRY_CTR), the ground terminal of the opto-coupler included in the second switch 41 is used to connect to the second control signal (the network label corresponds to 24_CTR), and the ground terminals of the opto-couplers included in the third switch 51, the fourth switch 52 and the fifth switch 53 are used to connect to the third control signal (the network label corresponds to DRY_CTR).

[0058] In some embodiments, the first control signal / DRY_CTR, the second control signal 24_CTR and the third control signal DRY_CTR can be provided by a control module capable of outputting high-level and low-level signals such as a processor, wherein the voltage of the high level is derived from the third DC voltage, and it is close to and equal to the third DC voltage.

[0059] In other embodiments, the operation switch can be manually controlled by setting the operation switch. For example, the first control signal / DRY_CTR is connected to the ground at one end of the operation switch, and the other end of the operation switch is connected to the ground of the optocoupler included in the first switch 31 and the sixth switch 54. When the operation switch is closed, it is equivalent to setting the first control signal / DRY_CTR to low. At this time, the optocoupler included in the first switch 31 and the sixth switch 54 is powered on and turned on. Conversely, when the operation switch is opened, it is equivalent to the first control signal / DRY_CTR being suspended. At this time, the optocoupler included in the first switch 31 and the sixth switch 54 is powered off and turned off. It can be understood that the control of the second control signal 24_CTR and the third control signal DRY_CTR can also be realized by using similar technical solutions, which will not be described here.

[0060] The working principle of the signal acquisition circuit is shown in the following: Figure 2 , Figure 2 The working principle of the signal acquisition circuit is shown in the following:

[0061] When the signal to be collected is a high-voltage control signal, the optocoupler included in the first switch 31 and the sixth switch 54 is turned on (i.e., the first control signal / DRY_CTR is low), and the optocoupler included in the second switch 41, the third switch 51, the fourth switch 52 and the fifth switch 53 is not turned on (i.e., the second control signal 24_CTR and the third control signal DRY_CTR are high or suspended), so that the signal interface 1, the first switch 31, the first resistive unit 32, the second resistive unit 33, the acquisition unit 2 and the sixth switch 54 form a conduction channel (i.e., the high-impedance acquisition channel is turned on), and the acquisition unit 2 can output a signal according to the state of the high-voltage control signal.

[0062] When the signal to be collected is a low-voltage control signal, the optocoupler included in the first switch 31, the second switch 41 and the sixth switch 54 is turned on (i.e., the first control signal / DRY_CTR and the second control signal 24_CTR are low), and the optocoupler included in the third switch 51, the fourth switch 52 and the fifth switch 53 is not turned on (i.e., the third control signal DRY_CTR is high or suspended), so that the signal interface 1, the first switch 31, the first resistive unit 32, the second switch 41, the acquisition unit 2 and the sixth switch 54 form a conduction channel (i.e., the low-impedance acquisition channel is turned on), and the acquisition unit 2 can output a signal according to the state of the low-voltage control signal.

[0063] When the to-be-acquired signal comprises the dry contact signal, when the to-be-acquired signal and the high-voltage control signal, the opto-coupler included in the first switch 31, the second switch 41 and the sixth switch 54 is not conducting (i.e. the first control signal / DRY_CTR and the second control signal 24_CTR are high or suspended), the opto-coupler included in the third switch 51, the fourth switch 52 and the fifth switch 53 is conducting (i.e. the third control signal DRY_CTR is low), so that the second direct current +24V can flow back to the ground through the third switch 51, the signal interface 1, the fourth switch 52, the acquisition unit 2 and the fifth switch 53, i.e. the dry contact acquisition channel is conducting, and then the acquisition unit 2 can output the state indication signal according to the dry contact signal.

[0064] In order to avoid the overcurrent damage of the opto-coupler, in some embodiments, as shown in FIG. 4, the first to sixth switches 54 can further include a second current-limiting resistor 6 respectively. The power supply end of the opto-coupler included in the first to sixth switches 54 is connected to the third direct current through the second current-limiting resistor 6 in a one-to-one manner. The second current-limiting resistor 6 can include a third resistor. Figure 2

[0065] In some embodiments, as shown in FIG. 5, the acquisition unit 2 can include an opto-coupler 21 and a third resistive unit 22. The power supply end of the opto-coupler 21 included in the acquisition unit 2 is connected to the connection node between the fourth switch 52 and the second resistive unit 33, the ground end of the opto-coupler 21 included in the acquisition unit 2 is connected to the connection node between the fifth switch 53 and the sixth switch 54, the input end of the opto-coupler 21 included in the acquisition unit 2 is connected to the fourth direct current (VCC), the output end of the opto-coupler 21 included in the acquisition unit 2 is connected to the ground through the third resistive unit 22, and the output end of the opto-coupler 21 included in the acquisition unit 2 outputs the state indication signal. It can be understood that when the high-voltage control signal is high, the low-voltage control signal is high or the dry contact signal is in the closed state, the opto-coupler 21 included in the acquisition unit 2 is powered on and conducting, so that the output end of the opto-coupler 21 included in the acquisition unit 2 is set to high, i.e. when the state indication signal is a high signal, it can represent that the high-voltage control signal is high, the low-voltage control signal is high or the dry contact signal is in the closed state. When the high-voltage control signal is low, the low-voltage control signal is low or the dry contact signal is in the open state, the opto-coupler 21 included in the acquisition unit 2 is powered off and disconnected, so that the output end of the opto-coupler 21 included in the acquisition unit 2 is set to low under the pull-down action of the third resistive unit 22, i.e. when the state indication signal is a low signal, it can represent that the high-voltage control signal is low, the low-voltage control signal is low or the dry contact signal is in the open state. Figure 2 In some embodiments, as shown in FIG. 6, the acquisition unit 2 can include a second opto-coupler 23 and a fourth resistive unit 24. The power supply end of the second opto-coupler 23 included in the acquisition unit 2 is connected to the connection node between the fourth switch 52 and the second resistive unit 33, the ground end of the second opto-coupler 23 included in the acquisition unit 2 is connected to the connection node between the fifth switch 53 and the sixth switch 54, the input end of the second opto-coupler 23 included in the acquisition unit 2 is connected to the fourth direct current (VCC), the output end of the second opto-coupler 23 included in the acquisition unit 2 is connected to the ground through the fourth resistive unit 24, and the output end of the second opto-coupler 23 included in the acquisition unit 2 outputs the state indication signal.

[0066] Figure 3 ​​As shown, the acquisition unit 2 can further include a second diode 10, an anode of the second diode 10 is connected to a ground end of the optocoupler relay 21 included in the acquisition unit 2, a cathode of the second diode 10 is connected to a connection node between the fifth switch 53 and the sixth switch 54, the second diode 10 is used to avoid that the high-voltage control signal or the low-voltage control signal is reversely input into the optocoupler relay 21 included in the acquisition unit 2 due to misoperation when the signal interface 1 is reversely connected, so as to cause the optocoupler relay 21 included in the acquisition unit 2 to be damaged, that is, the second diode 10 plays a role of protecting the optocoupler relay 21.

[0067] In order to ensure that the first control signal / DRY_CTR and the third control signal DRY_CTR remain opposite to each other, in some embodiments, the signal acquisition circuit can further include an inverter, the inverter is used to access the fourth control signal DRY and output the first control signal / DRY_CTR or the third control signal DRY_CTR.

[0068] In some embodiments, the inverter can include ​ As shown, the double-pole double-throw relay. The negative end of the excitation coil of the double-pole double-throw relay is connected to the fourth control signal DRY, the positive end of the excitation coil, the first normally open contact and the second normally closed contact of the double-pole double-throw relay are connected to the third direct current +5V, the first normally closed contact and the second normally open contact of the double-pole double-throw relay are grounded, the first common contact outputs the first control signal / DRY_CTR and the second common contact outputs the third control signal DRY_CTR. Wherein, when the excitation coil of the double-pole double-throw relay is energized, the first common contact and the first normally open contact of the double-pole double-throw relay are closed, the first common contact and the first normally closed contact are disconnected, the second common contact and the second normally open contact of the double-pole double-throw relay are closed, and the second common contact and the second normally closed contact are disconnected, when the excitation coil of the double-pole double-throw relay is de-energized, the first common contact and the first normally open contact of the double-pole double-throw relay are disconnected, the first common contact and the first normally closed contact are closed, the second common contact and the second normally open contact of the double-pole double-throw relay are disconnected, and the second common contact and the second normally closed contact are closed.

[0069] It can be understood that the utility model can collect various types of device control signals, such as high-voltage control signals, low-voltage control signals, dry contact signals, etc., and has compatibility for various device control signals, so that the nuclear power plant staff does not need to carry multiple acquisition devices to the site for operation, avoids damage to the device or instrument due to the use of wrong acquisition devices, and further, the utility model also has the advantages of simple circuit structure, small size and weight, which helps to improve portability, facilitates the staff to carry to the site for acquisition work, and improves the acquisition efficiency of the control signal.

[0070] The utility model also provides a signal acquisition device, including the signal acquisition circuit that the utility model embodiment provided.

[0071] It can be understood that the above embodiments only express the preferred embodiments of the utility model, the description is more specific and detailed, but it can not be understood as the limitation of the utility model patent scope; it should be pointed out that for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a plurality of variations and improvements can be made, which belong to the protection scope of the utility model; therefore, all equivalent transformations and modifications with the utility model claim scope should belong to the coverage of the utility model claim.

Claims

1. A signal acquisition circuit, characterized by comprising: The application relates to a signal acquisition device. The signal acquisition device comprises: a signal interface for accessing a signal to be acquired, wherein the signal to be acquired comprises a high-voltage control signal, a low-voltage control signal and a dry contact signal; an acquisition unit for outputting a state indication signal capable of representing the state of the signal to be acquired when the signal to be acquired is received; a high-impedance acquisition channel connected between the signal interface and the acquisition unit, and used for being turned on when the signal to be acquired is the high-voltage control signal; a low-impedance acquisition channel connected between the signal interface and the acquisition unit, and used for being turned on when the signal to be acquired is the low-voltage control signal; and 2. The signal acquisition circuit of claim 1, wherein, a dry contact acquisition channel connected between the signal interface and the acquisition unit, and used for being turned on when the signal to be acquired is the dry contact signal. The high-impedance acquisition channel comprises a first switch, a first resistive unit and a second resistive unit; 3. The signal acquisition circuit of claim 2, wherein, a first end of the first switch is connected to a positive terminal of the signal interface, a second end of the first switch is connected to a negative terminal of the signal interface through the first resistive unit, the second resistive unit and the acquisition unit, and the first switch is turned on when the signal to be acquired is the high-voltage control signal. The low-impedance acquisition channel comprises a second switch; 4. The signal acquisition circuit of claim 3, wherein, the second switch is connected in parallel with the second resistive unit, and the second switch and the first switch are turned on when the signal to be acquired is the low-voltage control signal. The dry contact acquisition channel comprises a third switch, a fourth switch, a fifth switch and a sixth switch; 5. The signal acquisition circuit of claim 4, wherein, a first end of the third switch is connected to a first direct-current voltage, a second end of the third switch is connected to a positive terminal of the signal interface, a negative terminal of the signal interface is connected to a connection node between the acquisition unit and the second resistive unit through the fourth switch, the sixth switch connects the acquisition unit and the negative terminal of the signal interface, and a node connected between the sixth switch and the acquisition unit is also connected to the fifth switch; the third switch, the fourth switch and the fifth switch are turned on and the sixth switch is turned off when the signal to be acquired is the dry contact signal; and the third switch, the fourth switch and the fifth switch are turned off and the sixth switch is turned on when the signal to be acquired is the high-voltage control signal or the low-voltage control signal. The first to sixth switches respectively comprise optocoupler relays; an input end of the optocoupler relay comprised by the first switch is connected to the positive terminal of the signal interface, and an output end of the optocoupler relay comprised by the first switch is connected to the first resistive unit; an input end and an output end of the optocoupler relay comprised by the second switch are connected in parallel with the second resistive unit; an input end of the optocoupler relay comprised by the third switch is connected to a second direct-current voltage, and an output end of the optocoupler relay comprised by the third switch is connected to the positive terminal of the signal interface; an input end of the optocoupler relay comprised by the fourth switch is connected to the negative terminal of the signal interface, and an output end of the optocoupler relay comprised by the fourth switch is connected to the connection node between the acquisition unit and the second resistive unit. The input end of the optocoupler included in the fifth switch is connected to a connection node between the collection unit and the sixth switch, and the output end of the optocoupler included in the fifth switch is grounded. The input end of the optocoupler included in the sixth switch is connected to the input end of the optocoupler included in the fifth switch, and the output end of the optocoupler included in the fifth switch is connected to the negative end of the signal interface. The power supply ends of the optocouplers included in the first to sixth switches are all connected to a third direct current voltage, the ground ends of the optocouplers included in the first switch and the sixth switch are used to input a first control signal, the ground end of the optocoupler included in the second switch is used to input a second control signal, and the ground ends of the optocouplers included in the third switch, the fourth switch and the fifth switch are used to input a third control signal.

6. The signal acquisition circuit of claim 5, wherein, The first to sixth switches further respectively include a first current-limiting resistor, and the power supply ends of the optocouplers included in the first to sixth switches are respectively and one-to-one connected to the third direct current voltage through the first current-limiting resistors.

7. The signal acquisition circuit of claim 5, wherein, The signal collection circuit further includes an inverter, which is used to input a fourth control signal and output the first control signal or the third control signal.

8. The signal acquisition circuit of any one of claims 4 to 7, wherein, The collection unit includes an optocoupler and a third resistive unit. The power supply end of the optocoupler included in the collection unit is connected to a connection node between the fourth switch and the second resistive unit, the ground end of the optocoupler included in the collection unit is connected to a connection node between the fifth switch and the sixth switch, the input end of the optocoupler included in the collection unit is connected to a fourth direct current voltage, and the output end of the optocoupler included in the collection unit is connected to the ground through the third resistive unit and outputs the state indication signal.

9. The signal acquisition circuit of any one of claims 2 to 7, wherein, The signal interface includes a fuse, a protection tube, a second current-limiting resistor, a first interface used to connect the positive pole of the signal to be collected, and a second interface used to connect the negative pole of the signal to be collected. The first interface is connected to the first end of the fuse, the second end of the fuse corresponds to the positive end of the signal interface and is connected to the second interface through the protection tube, the second interface is further connected to the first end of the second current-limiting resistor, and the second end of the second current-limiting resistor corresponds to the negative end of the signal interface.

10. A signal acquisition device, characterized by The signal collection circuit includes the signal collection circuit according to any one of claims 1 to 9.

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