Sensing circuit with electromagnetic interference protection

Abstract

The application relates to a sensing circuit with electromagnetic interference protection function, comprising an operation element and a sensing module. The operation element has a first end and a second end, and is used for outputting a sensing result according to a voltage difference between the first end and the second end. The sensing module has a first contact, a second contact, a third contact and a fourth contact, the first contact is electrically connected to the first end, the second contact is electrically connected to the second end and grounded through a first circuit, the third contact is electrically connected to the first contact and used for receiving an electric signal, and the fourth contact is electrically connected to the second contact and grounded through a second circuit, wherein the first circuit is the same as the second circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to a sensing circuit, in particular to a sensing circuit with electromagnetic interference protection function. BACKGROUND

[0002] With the development of short video and cloud service, the demand for data storage of servers is getting higher and higher. The power consumption of processors is getting higher and higher. Nowadays, manufacturers choose to increase the frequency to get higher performance, which is accompanied by the increase of the power consumption of processors. Under the demand of such trend, the system power consumption is getting higher and higher, and the signal frequency is getting faster and faster.

[0003] Under the trend of increasing power consumption of processors, the selection of large current becomes inevitable. When there is current flowing through a wire, a ring-shaped magnetic field will be formed around it. If the current is relatively large and starts to change, a relatively large magnetic field will be generated. The changing current will generate a changing magnetic field, which will generate a changing electric field, and the changing electric field will generate a changing magnetic field. They will alternately propagate from near to far, so that the relatively sensitive electrical equipment in them may not work normally or may have poor performance. SUMMARY

[0004] In view of the above, the present application provides a sensing circuit with electromagnetic interference protection function.

[0005] According to an embodiment of the present application, the sensing circuit with electromagnetic interference protection function comprises an operation element and a sensing module. The operation element has a first end and a second end, and is used to output a sensing result according to the voltage difference between the first end and the second end. The sensing module has a first contact point, a second contact point, a third contact point and a fourth contact point. The first contact point is electrically connected to the first end, the second contact point is electrically connected to the second end and grounded through a first circuit, the third contact point is electrically connected to the first contact point and used to receive an electric signal, and the fourth contact point is electrically connected to the second contact point and grounded through a second circuit. The first circuit is the same as the second circuit, and the first circuit is connected to the node between the second contact point and the second end.

[0006] In one embodiment, the sensing module comprises a first connector, a liquid leakage detection rope and a second connector. The first connector has a first contact point, a second contact point, a fifth contact point and a sixth contact point. The first contact point is electrically connected to the fifth contact point, and the second contact point is electrically connected to the sixth contact point. The liquid leakage detection rope comprises a first detection line and a second detection line. One end of the first detection line is electrically connected to the fifth contact point, and one end of the second detection line is electrically connected to the sixth contact point. The second connector has a seventh contact point, an eighth contact point, a third contact point and a fourth contact point. The seventh contact point is electrically connected to the other end of the first detection line, and the eighth contact point is electrically connected to the other end of the second detection line.

[0007] In one of the embodiments, the first connector and the second connector are each a connector suitable for signal transmission of the mainboard.

[0008] In one of the embodiments, the sensing module is disposed adjacent to a processor of the mainboard and is located in a magnetic field interference area formed by high-frequency signals of the processor.

[0009] In one of the embodiments, the first circuit and the second circuit are each a wire.

[0010] In one of the embodiments, the operation element is a comparator.

[0011] In one of the embodiments, the distance between the node and the operation element is less than the distance between the midpoint of the second contact and the fourth contact and the node.

[0012] In one of the embodiments, the sensing module includes at least one of a piezoresistor, a thermistor, a magnetic sensitive component, and a relay.

[0013] Through the above structure, the sensing circuit with electromagnetic interference protection function disclosed by the embodiments of the present application can be simply and effectively achieved by grounding the signal input end of the operation element through the same grounding mode as the grounding end of the sensing module. Compared with the method of externally adding a layer or shell with electromagnetic shielding function, the sensing circuit of the present application not only facilitates implementation, but also can avoid the situation of insufficient shielding capability and unable to solve the electromagnetic interference problem from the root, so that the electromagnetic sensitive sensing circuit can still maintain the normal sensing and operation function even in the magnetic field change environment filled with high-frequency signals.

[0014] The above description of the embodiments of the present application and the following description of the embodiments are used to illustrate and explain the spirit and principle of the present application, and provide further explanation of the claims of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic diagram of a sensing circuit with electromagnetic interference protection function according to an embodiment of the present application.

[0016] Figure 2 FIG. 2 is a schematic diagram of a sensing circuit with electromagnetic interference protection function according to another embodiment of the present application.

[0017] Figure 3 FIG. 3 is a schematic diagram of a detection state of a liquid leakage detection rope of a sensing circuit with electromagnetic interference protection function according to another embodiment of the present application.

[0018] LEGEND DESCRIPTION:

[0019] 100, sensing circuit, 100', sensing circuit, 1, operation element, 2, sensing module, 2', sensing module, 20, liquid leakage detection rope, 20a, first detection line, 20b, second detection line, 21, first connector, 22, second connector, 3, first circuit, 4, second circuit, T1, first end, T2, second end, P1, first junction, P2, second junction, P3, third junction, P4, fourth junction, P5, fifth junction, P6, sixth junction, P7, seventh junction, P8, eighth junction, N, node, V1, electrical signal, d1, distance, d2, distance. DETAILED DESCRIPTION

[0020] The detailed description is made below in the embodiments to describe the detailed features and advantages of the present application in sufficient details so that those of ordinary skill in the art can understand the technical contents of the present application and implement the same. Based on the contents disclosed in the present specification, the scope of the application and the drawings, anyone of ordinary skill in the art can easily understand the related purposes and advantages of the present application. The following examples further illustrate the ideas of the present application, but do not limit the scope of the present application in any way.

[0021] Please refer to Figure 1 , Figure 1 is a schematic diagram of a sensing circuit with electromagnetic interference protection function according to an embodiment of the present application. As shown in Figure 1 , the sensing circuit with electromagnetic interference protection function 100 includes an operation element 1, a sensing module 2, a first circuit 3 and a second circuit 4. The operation element 1 has a first end T1 and a second end T2, for outputting a sensing result according to the voltage difference between the first end T1 and the second end T2. The sensing module 2 has a first junction P1, a second junction P2, a third junction P3 and a fourth junction P4, the first junction P1 is electrically connected to the first end T1, the second junction P2 is electrically connected to the second end T2 and grounded through the first circuit 3, the third junction P3 is electrically connected to the first junction P1 through the internal circuit of the module and used to receive an electrical signal V1, the fourth junction P4 is electrically connected to the second junction P2 through the internal circuit of the module and grounded through the second circuit 4, wherein the circuit composition of the first circuit 3 is the same as that of the second circuit 4, and the first circuit 3 is connected to the node N between the second junction P2 and the second end T2.

[0022] In the embodiment of the present application, the operation element 1 can be implemented by an operational amplifier or a comparator, for generating a sensing result according to the voltage difference between the first terminal T1 and the second terminal T2. For example, when the voltage difference between the first terminal T1 and the second terminal T2 is higher than a predetermined value, the operation element 1 can output a first result, and when the voltage difference between the first terminal T1 and the second terminal T2 is less than or equal to the predetermined value, the operation element 1 can output a second result. The sensing module 2 can include at least one of a liquid leakage detection component, a pressure sensitive resistor, a thermistor, a magnetic sensitive component, and a relay. One side of the sensing module 2 is used for receiving the electrical signal V1, and the other side is used for connecting to the operation element 1.

[0023] In the embodiment of the present application, the judgment reference of the operation element 1 is related to the voltage value of the electrical signal V1. Specifically, the sensing module 2 can change to different states according to the sensed environmental changes. For example, when the sensing module 2 is in a first state, the voltage difference between the first contact P1 and the second contact P2 can be equal to the voltage difference between the third contact P3 and the fourth contact P4, i.e. the electrical signal V1, and accordingly, the operation element 1 can detect that the sensing module is in the first state. Alternatively, when the sensing module 2 is in a second state, the voltage difference between the first contact P1 and the second contact P2 can be different from the electrical signal V1, and accordingly, the operation element 1 can detect that the sensing module is in the second state. In the embodiment of the present application, the first circuit 3 and the second circuit 4 are the same, for example, the same resistor component.

[0024] The sensing circuit 100 with electromagnetic interference protection function in the embodiment of the present application can be arranged in a magnetic field interference environment to maintain the normal operation of the operation element 1 and the sensing module 2. For example, although the sensing module 2 is in the first state, it is located in a magnetic field interference environment, resulting in that the voltage difference between the first contact P1 and the second contact P2 is affected by the magnetic field and changed to be different from the electrical signal V1. However, through the first circuit 3 symmetrically arranged with the second circuit 4, the voltage difference received by the first terminal T1 and the second terminal T2 of the operation element 1 is not disturbed by the external magnetic field, so that the sensing module 2 in the first state can be successfully distinguished, and the false alarm condition caused by the magnetic field interference can be avoided.

[0025] Based on Figure 1The embodiments of the sensing circuit 100 are described below. The first circuit 3 and the second circuit 4 can both be wires, i.e. the fourth contact P4 of the sensing module 2 and the second end T2 of the operation element 1 can be directly grounded. In this way, even if the sensing module 2 is disturbed by the ambient magnetic field and the voltage changes in the middle, the operation element 1 can accurately measure the voltage difference between the first end T1 and the second end T2. In addition, the distance between the node N and the operation element 1 can be less than the distance between the midpoint of the second contact P2 and the fourth contact P4 and the node N, that is, the closer the node N is to the ground, the more effectively the voltage change caused by the magnetic field disturbance of the sensing module located at a remote position can be suppressed, and the occurrence of detection errors can be further reduced.

[0026] Please refer to Figure 2 , Figure 2 The sensing circuit with electromagnetic interference protection function according to another embodiment of the present application is shown in the schematic diagram. As shown in Figure 2 , the sensing circuit with electromagnetic interference protection function 100' includes an operation element 1, a sensing module 2', a first circuit 3 and a second circuit 4. The operation element 1 has a first end T1 and a second end T2 for outputting a sensing result according to the voltage difference between the first end T1 and the second end T2. The sensing module 2' includes a liquid leakage detection rope 20, a first connector 21 and a second connector 22. The first connector 21 has a first contact P1, a second contact P2, a fifth contact P5 and a sixth contact P6, the first contact P1 is electrically connected to the fifth contact P5 through an internal circuit, and the second contact P2 is electrically connected to the sixth contact P6 through an internal circuit. The liquid leakage detection rope 20 includes a first detection line 20a and a second detection line 20b, one end of the first detection line 20a is electrically connected to the fifth contact P5, and one end of the second detection line 20b is electrically connected to the sixth contact P6. The second connector 22 has a seventh contact P7, an eighth contact P8, a third contact P3 and a fourth contact P4, the third contact P3 is electrically connected to the seventh contact P7 through an internal circuit, and the fourth contact P4 is electrically connected to the eighth contact P8 through an internal circuit, wherein the seventh contact P7 is electrically connected to the other end of the first detection line 20a, and the eighth contact P8 is electrically connected to the other end of the second detection line 20b. The first contact P1 is electrically connected to the first end T1, the second contact P2 is electrically connected to the second end T2 and grounded through the first circuit 3, the third contact P3 is electrically connected to the first contact P1 through the first liquid leakage detection line 20a and used for receiving an electrical signal V1, and the fourth contact P4 is electrically connected to the second contact P2 through the second liquid leakage detection line 20b and grounded through the second circuit 4, wherein the first circuit 3 is the same as the second circuit 4, and the first circuit 3 is connected to the node N between the second contact P2 and the second end T2.

[0027] In the embodiment of the present application, the operation element 1 can be implemented by, for example, an operational amplifier or a comparator. The sensing module 2' is composed of two connectors and a liquid leakage detection cord, wherein the first connector 21 and the second connector 22 can each be a connector suitable for signal transmission of a mainboard. Specifically, the sensing module 2' can be disposed adjacent to a processor of the mainboard and located in a magnetic field interference area formed by high-frequency signals of the processor. The first circuit 3 and the second circuit 4 are the same, for example, the same resistance components. The sensing circuit 100' with the electromagnetic interference protection function in the embodiment of the present application is particularly related to a liquid leakage sensing circuit. The liquid leakage sensing circuit is disposed adjacent to a liquid cooling module to detect the occurrence of liquid leakage. The liquid cooling module is disposed adjacent to a high-power component to perform cooling operation. However, the liquid leakage detection cord of the liquid leakage sensing circuit is a sensitive device and is easily interfered by external electromagnetic fields.

[0028] Please combine Figure 2 and refer to Figure 3 , Figure 3 is a schematic diagram of the detection state of the liquid leakage detection cord of the sensing circuit with the electromagnetic interference protection function according to another embodiment of the present application. As shown in Figure 3 , the first detection line 20a and the second detection line 20b of the liquid leakage detection cord 20 of the sensing module 2' are covered by a water-absorbable material. Therefore, in a dry condition, the first detection line 20a and the second detection line 20b can be regarded as an open circuit. However, when the liquid leakage detection cord 20 contacts liquid, a short circuit is formed between the first detection line 21 and the second detection line 22, thereby affecting the voltage value at the connection between the first connector and the operation element.

[0029] In the embodiment of the present application, the liquid leakage detection cord 20 is connected to the first connector 21 and the second connector 22 installed on the mainboard at both ends thereof and disposed adjacent to a liquid pipeline of the liquid cooling module. In a normal dry (no liquid leakage) condition, the operation element 1 can measure the voltage difference between the first end T1 and the second end T2 through the first connector 21, the liquid leakage detection cord 20 and the second connector 22, and the electrical signal V1 is substantially the same. In the case where the liquid leakage detection cord 20 contacts liquid leakage, a short circuit is formed between the first detection line 20a and the second detection line 20b, so that the operation element 1 measures the voltage difference between the first end T1 and the second end T2 to be less than the voltage of the electrical signal V1. In the dry (no liquid leakage) condition and the case where the liquid leakage detection cord 20 is located in a magnetic field interference environment, the first detection line 20a and the second detection line 20b can generate interference signals. However, by grounding between the second end T2 of the operation element 1 and the second contact P2, the operation element 1 can measure the voltage difference between the first end T1 and the second end T2 to be the same as the electrical signal V1 to determine that no liquid leakage occurs, and is not interfered by the environmental magnetic field.

[0030] In the embodiment of the present application, the length of the liquid leakage detection rope 20 can reach tens of centimeters to several meters, and the distance d1 between the node N grounded between the second end 12 and the second contact P2 and the operation element 1 is less than the distance d2 between the midpoint of the second contact P2 and the fourth contact P4 and the above-mentioned grounded node N, wherein the distances d1 and d2 can refer to the path length of the relevant electrical signals without being limited to the distance between two points. Through the near-point grounding circuit configuration of the embodiment of the present application, the influence of the change of the environmental magnetic field on the measurement of the operation element 1 can be effectively reduced, the accuracy is improved, and the false alarm rate is reduced. The present application is suitable for other sensitive devices (such as piezoresistors, thermistors, magnetic sensitive components, etc.) and relays that are susceptible to electromagnetic interference. When laying out and designing electronics, electromagnetic interference should be considered, and logic judgment devices can be electromagnetically protected in the manner of the foregoing embodiments.

[0031] Preferably, the first connector 21 described above can use a J27 series connector on the market as the connection between the liquid leakage detection rope 20 and the signal source, and the second connector 22 can use a J41 series connector on the market as the connection between the liquid leakage detection rope 20 and the operation element 1. The electrical signal V1 can be a 3-volt voltage signal. The operation element 1 can use a U29 series comparator on the market to achieve. The above-mentioned specific model connector is suitable for use with the mainboard, the liquid leakage detection rope, and the liquid cooling module. The above-mentioned comparator is suitable for measurement according to the electrical signal (such as 3 volts) applied to one end of the first connector 21 to determine whether the liquid leakage detection rope 20 contacts the liquid leakage.

[0032] Through the above structure, in the sensing circuit with electromagnetic interference protection function provided by the embodiment of the present application, the signal input end of the operation element is grounded in the same grounding manner as the grounding end of the sensing module, which can simply and effectively achieve the effect of electromagnetic interference protection. Compared with the method of externally adding a layer or shell with electromagnetic shielding function, the sensing circuit of the embodiment of the present application not only facilitates implementation, but also can avoid the situation that the shielding ability is insufficient and the electromagnetic interference problem cannot be solved from the root, so that the electromagnetic sensitive sensing circuit can still maintain the normal sensing and operation function even in a magnetic field change environment with high frequency signal. In addition, the sensing circuit of the embodiment of the present application can effectively reduce the influence of the change of the environmental magnetic field on the measurement of the operation element, improve the accuracy, and reduce the false alarm rate. The embodiment of the present application can be applied to various sensitive devices (such as liquid leakage detection components, piezoresistors, thermistors, magnetic sensitive components, etc.) and relays that are susceptible to electromagnetic interference.

[0033] Although the present application is disclosed as above with the foregoing embodiments, it is not intended to limit the present application. Without departing from the spirit and scope of the present application, any modification and improvement made thereto shall fall within the scope of the patent protection of the present application. For the scope of protection of the present application, please refer to the scope of the appended claims.

Claims

1. A sensing circuit with electromagnetic interference protection function, characterized in that, The application relates to a sensing module and a liquid leakage detection device. The sensing module comprises: an operation element having a first end and a second end for outputting a sensing result according to a voltage difference between the first end and the second end; a sensing module having a first contact point, a second contact point, a third contact point and a fourth contact point, the first contact point being electrically connected to the first end, the second contact point being electrically connected to the second end and grounded through a first circuit, the third contact point being electrically connected to the first contact point and used for receiving an electric signal, and the fourth contact point being electrically connected to the second contact point and grounded through a second circuit; wherein the first circuit is the same as the second circuit, and the first circuit is connected to a node between the second contact point and the second end.

2. The sensing circuit having an electromagnetic interference shielding function according to claim 1, characterized by, The sensing module comprises: a first connector having the first contact point, the second contact point, a fifth contact point and a sixth contact point, the first contact point being electrically connected to the fifth contact point, and the second contact point being electrically connected to the sixth contact point; a liquid leakage detection rope comprising a first detection line and a second detection line, one end of the first detection line being electrically connected to the fifth contact point, and one end of the second detection line being electrically connected to the sixth contact point; and a second connector having a seventh contact point, an eighth contact point, the third contact point and the fourth contact point, the seventh contact point being electrically connected to the other end of the first detection line, and the eighth contact point being electrically connected to the other end of the second detection line.

3. The sensing circuit having an electromagnetic interference shielding function according to claim 2, characterized by, The first connector and the second connector are connectors suitable for signal transmission of a mainboard.

4. The sensing circuit having an electromagnetic interference shielding function according to claim 2, characterized by, The sensing module is arranged adjacent to a processor of the mainboard and located in a magnetic field interference area formed by high-frequency signals of the processor.

5. The sensing circuit having an electromagnetic interference shielding function according to claim 1, characterized by, The first circuit and the second circuit are wires.

6. The sensing circuit having an electromagnetic interference shielding function according to claim 1, characterized by, The operation element is a comparator.

7. The sensing circuit having an electromagnetic interference shielding function according to claim 1, characterized by, The distance between the node and the operation element is smaller than the distance between a midpoint of the second contact point and the fourth contact point and the node.

8. The sensing circuit having an electromagnetic interference shielding function according to claim 1, characterized by, The sensing module comprises at least one of a pressure-sensitive resistor, a thermistor, a magnetic-sensitive component and a relay.

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