Transmission module and transmission circuit

Abstract

The present invention relates to the field of high-precision semiconductor measurement and provides a transmission module and a transmission circuit. The transmission module includes a main signal transmission layer, which includes a main signal transmission line and a first internal protection line, a first intermediate protection line, and a first external protection line arranged sequentially from the inside out on the same side of the main signal transmission line. The main signal transmission line also includes a second internal protection line, a second intermediate protection line, and a second external protection line arranged sequentially from the inside out on the other side of the main signal transmission line. The main signal transmission line transmits a first main signal to obtain a second main signal, the first internal protection line and the second internal protection line transmit the second main signal to obtain a first sampling signal, the first intermediate protection line and the second intermediate protection line transmit a protection signal, the protection signal having the same voltage as the first sampling signal, and the first external protection line and the second external protection line are connected to a ground signal. This reduces leakage current generated in the transmission module and reduces electromagnetic interference.

Description

Technical Field

[0001] The present invention relates to the field of semiconductor high-precision measurement, and in particular to a transmission module and a transmission circuit. Background Art

[0002] With the development of semiconductor technology and processing technology, the development of high-precision manufacturing technology and the requirements of nm-level wafer processing, femtoampere (fA)-level current measurement is needed. During the current measurement process, leakage current will be generated in the transmission module, and as the line in the tested transmission module becomes longer, the line voltage drop in the transmission module will increase, making the leakage current generated in the transmission module even larger, even reaching picoampere (pA) or even nanoampere (nA). For femtoampere (fA)-level current measurement, the accuracy of high-precision measurement will be affected, resulting in measurement failure. In the existing technology, the following methods are often used: Figure 1 The transmission module shown is a PCB transmission line. Since only one side of the core line in the main signal transmission layer has an internal protection line, leakage current is generated between the core line in the main signal transmission layer and the adjacent intermediate protection line due to the voltage difference. In addition, the core line will also generate leakage current with the intermediate protection line in the first intermediate protection layer and the intermediate protection line in the second intermediate protection layer due to the voltage difference. Therefore Figure 1 A large leakage current will occur in the transmission module shown. Summary of the Invention

[0003] An object of the present invention is to provide a transmission module and a transmission circuit for reducing leakage current generated in the transmission module.

[0004] The present invention provides a transmission module, comprising a main signal transmission layer,

[0005] The main signal transmission layer includes a main signal transmission line, a first inner protection line, a second inner protection line, a first middle protection line, a second middle protection line, a first outer protection line, and a second outer protection line extending in the same direction;

[0006] The first outer protection line and the second outer protection line are respectively arranged on both sides of the main signal transmission line, the first middle protection line is arranged between the first outer protection line and the first inner protection line, the second middle protection line is arranged between the second outer protection line and the second inner protection line, the first inner protection line is arranged between the first middle protection line and the main signal transmission line, and the second inner protection line is arranged between the second middle protection line and the main signal transmission line;

[0007] The main signal transmission line is used to transmit the first main signal to obtain the second main signal, and transmit the remote sampling signal with a voltage equal to that of the second main signal to the first internal protection line and the second internal protection line. The first internal protection line and the second internal protection line are respectively used to transmit the remote sampling signal and obtain the first sampling signal. The first intermediate protection line and the second intermediate protection line are respectively used to transmit the protection signal. The protection signal has a voltage equal to that of the first sampling signal. The first external protection line and the second external protection line are connected to the ground signal.

[0008] The present invention also provides a transmission circuit connected to an external source circuit and a load circuit, the transmission circuit includes a transmission module and a first drive isolation module.

[0009] The main signal transmission line is used to receive a first main signal emitted by an external source circuit and transmit the first main signal to the first end of the load circuit to obtain a second main signal, use a voltage signal at the first end of the load circuit that is equal to the voltage of the second main signal as a remote sampling signal, and transmit the remote sampling signal to the first internal protection line and the second internal protection line. The first internal protection line and the second internal protection line transmit the remote sampling signal to obtain a first sampling signal, and transmit the first sampling signal to the first drive isolation module.

[0010] The first driving isolation module is used to receive the first sampling signal and convert the sampling signal into a protection signal. It is also used to isolate the current input from the input end of the first driving isolation module from the current output from the output end of the first driving isolation module. The voltage of the protection signal is equal to that of the second main signal.

[0011] The beneficial effects of the present invention are:

[0012] 1. The transmission module of the present invention provides a first internal protection line and a second internal protection line on both sides of a main signal transmission line in a main signal transmission layer. Both lines are used to transmit a second main signal transmitted from the main signal transmission line and obtain a first sampling signal. The first intermediate protection line and the second intermediate protection line are both used to transmit a protection signal having a voltage equal to the first sampling signal. This ensures that the voltage difference between the first internal protection line and the first intermediate protection line, as well as the voltage difference between the second internal protection line and the second intermediate protection line, is very small and nearly zero. Consequently, leakage current generated between the first internal protection line and the first intermediate protection line, as well as between the second internal protection line and the second intermediate protection line, is very small and nearly zero, thereby reducing leakage current generated in the transmission module.

[0013] 2. In the transmission circuit of the present invention, since the voltage of the first sampling signal obtained through the first internal protection line and the second internal protection line is equal to the voltage of the protection signal output to the first intermediate protection line and the second intermediate protection line, the voltage difference between the first internal protection line and the first intermediate protection line and the voltage difference between the second internal protection line and the second intermediate protection line are very small and almost zero. Therefore, the leakage current generated between the first internal protection line and the first intermediate protection line and between the second internal protection line and the second intermediate protection line due to the voltage difference is also very small and almost zero, thereby reducing the leakage current generated in the transmission circuit. In addition, most of the leakage current generated between the main signal transmission line and the first internal protection line and between the main signal transmission line and the second internal protection line flows to the load circuit, further reducing the leakage current generated in the transmission circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A longitudinal cross-sectional view of a PCB transmission line in the prior art;

[0015] Figure 2 It is a schematic diagram of a transmission circuit in the prior art;

[0016] Figure 3 A longitudinal cross-sectional view of a transmission module according to an embodiment of the present disclosure;

[0017] Figure 4 is a longitudinal sectional view of a transmission module according to another embodiment of the present disclosure;

[0018] Figure 5 A transmission circuit diagram of an embodiment of the present disclosure;

[0019] Figure 6 A transmission circuit diagram of another embodiment of the present disclosure;

[0020] Figure 7 A transmission circuit diagram of yet another embodiment of the present disclosure;

[0021] Figure 8 4 is an equivalent diagram of the third transmission circuit according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The words "including" and similar words used in this article mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0023] The transmission module of the prior art, for example, a PCB transmission line, such as Figure 1 As shown, it includes a main signal transmission layer 21, a first intermediate protective layer 22, a second intermediate protective layer 23, a first outer protective layer 24 and a second outer protective layer 25. The first intermediate protective layer 22, the second intermediate protective layer 23, the first outer protective layer 24 and the second outer protective layer 25 are symmetrically arranged on the upper and lower sides of the main signal transmission layer 21. The main signal transmission layer 21 includes a core line 211 and an intermediate protective line 213 and an outer protective line 215 sequentially arranged on the left side of the core line 211, and also includes a signal sampling line 212 and a signal sampling line 215 sequentially arranged on the right side of the core line 211. The middle protection line 214 and the outer protection line 216; the first middle protection layer 22 includes the middle protection line 221 and the outer protection line 222 and the outer protection line 223 arranged on the left and right sides of the middle protection line 221; the second middle protection layer 23 includes the middle protection line 231 and the outer protection line 232 and the outer protection line 233 arranged on the left and right sides of the middle protection line 231; the first outer protection layer 24 includes the outer protection line 241, and the second outer protection layer 25 includes the outer protection line 251. The transmission circuit of the prior art is as follows Figure 2 As shown, Figure 2The transmission module in the circuit is a PCB transmission line, which only includes the main signal transmission layer 21. The connection relationship is as follows: the external source circuit 2 is electrically connected to the A end of the core line 211, the B end of the core line 211 is electrically connected to the first end of the load circuit 3, the first end of the load circuit 3 is electrically connected to the B end of the signal sampling line 212 in the main signal transmission layer 21, the A end of the signal sampling line 212 is electrically connected to the input end of the second precision voltage driving module, the output end of the second precision voltage driving module is electrically connected to the voltage measurement module 6, and is also electrically connected to the input end of the first precision voltage driving module. Connection, the output end of the first precision voltage driving module is electrically connected to the A end of the intermediate protection line 213 and the A end of the intermediate protection line 214, the A end of the external protection line 215 and the A end of the external protection line 216 are both electrically connected to the ground signal AGND, the A end of the intermediate protection line 213 is connected to the A end of the intermediate protection line 214, the B end of the intermediate protection line 213 is connected to the B end of the intermediate protection line 214, the B end of the external protection line 215 is connected to the B end of the external protection line 216, and the second end of the load circuit 3 is connected to the ground signal AGND. The external source circuit 2 outputs the first main signal Force+ and transmits it to the A and B ends of the core line 211. The first main signal Force+ becomes the second main signal F+ (because the first main signal Force+ has a voltage drop when it is transmitted on the core line 211, the second main signal F+ is used to refer to the first main signal Force+ after the voltage drop change). The signal is then transmitted from the B end of the core line 211 to the first end of the load circuit 3. The remote sampling signal S+ of the first end of the load circuit is transmitted from the first end of the load circuit 3 to the B end of the signal sampling line 212. The voltage of the remote sampling signal S+ is equal to the voltage of the second main signal. The signal is then transmitted from the B end of the signal sampling line 212 to the A end. The remote sampling signal S+ becomes the first sampling signal. The first sampling signal Vsense+ is transmitted from the A end of the signal sampling line 212 to the input end of the second precision voltage driving module; the second precision voltage driving module converts the first sampling signal Vsense+ into a second sampling signal Vsense, and outputs it from the output end of the second precision voltage driving module to the voltage measurement module 6. At the same time, the second sampling signal Vsense is transmitted to the input end of the first precision voltage driving module. The first precision voltage driving module converts the second sampling signal Vsense into a protection signal Guard, and outputs it from the output end of the first precision voltage driving module to the A end and the B end of the middle protection line 213, as well as the A end and the B end of the middle protection line 214. Figure 2In the circuit, the voltage of the first main signal Force+ is V1, the voltage of the second main signal F+ and the remote sampling signal S+ are both V0, the voltage of the first sampling signal Vsense+ is V3, the voltage of the second sampling signal Vsense is V4, and the voltage of the protection signal Guard is V2. Due to the difference between V1 and V2, a leakage current ILeakage0 will be generated between the core line 211 and the middle protection line 213 due to the voltage difference. Similarly, there is a difference between V1 and V3, so a leakage current ILeakage3 will be generated between the core line 211 and the signal sampling line 212 due to the voltage difference. In addition, there is a difference between V2 and V3, so a leakage current ILeakage1 will be generated between the signal sampling line 212 and the middle protection line 214 due to the voltage difference. Therefore, the input current Iin of the core line 211 in the PCB transmission line is Iout+ILeakage0 +ILeakage3, where ILeakage0 is the leakage current between the core line 211 and the intermediate protection line 213 in the PCB transmission line, and Leakage3 is the leakage current generated between the core line 211 and the signal sampling line 212. However, part of Leakage3 is ILeakage1 and ILeakage2, and the rest flows to the load circuit 3 and is not counted as leakage current. ILeakage1 is the leakage current between the signal sampling line 212 and the intermediate protection line 214 in the PCB transmission line. Therefore, the leakage current ILeakage generated in the PCB transmission line = ILeakage0 + ILeakage1 +ILeakage2, and for Ileakage2, since the selection of the second precision voltage driving module can ensure that it is very small, basically at the fA level, the value of ILeakage2 is very small. In addition, the voltage difference between the intermediate protection line 214 and the signal sampling line 212 is very small, so the leakage current ILeakage1 generated based on this voltage difference is also very small. Therefore, the actual impact on the leakage current of the transmission circuit is ILeakage0. This part of the leakage current can reach the pA level, 1000fA=1pA, which is still relatively large compared to the leakage current of the fA level. Therefore, it is necessary to further improve the transmission module and transmission circuit of the existing technology to reduce the leakage current generated in the transmission module and the transmission circuit.

[0024] To reduce the leakage current generated in the transmission module, such as Figure 3As shown, the embodiment of the present disclosure discloses a transmission module 1, including a main signal transmission layer 11, the main signal transmission layer 11 includes a main signal transmission line 111, a first internal protection line 112, a second internal protection line 113, a first middle protection line 114, a second middle protection line 115, a first external protection line 116 and a second external protection line 117 extending in the same direction; the first external protection line 116 and the second external protection line 117 are respectively arranged on both sides of the main signal transmission line 111, the first middle protection line 114 is arranged between the first external protection line 116 and the first internal protection line 112, the second middle protection line 115 is arranged between the second external protection line 117 and the second internal protection line 113, the first internal protection line 112 is arranged between the first middle protection line 114 and the main signal transmission line 111, and the second internal protection line 113 is arranged between the second middle protection line 114 and the main signal transmission line 111. protection line 115 and the main signal transmission line 111; further, in the main signal transmission layer 11, with the main signal transmission line 111 as the center, a first internal protection line 112, a second internal protection line 113, a first middle protection line 114, a second middle protection line 115, a first external protection line 116 and a second external protection line 117 are arranged on the left and right sides of the main signal transmission line 111 from the inside to the outside. In addition, the right side of the first internal protection line 112 covers the left side of the main signal transmission line 111, and the left side of the second internal protection line 113 covers the right side of the main signal transmission line 111. This arrangement can prevent the main signal transmission line 111 from crossing the first internal protection line 112 and the second internal protection line 113 and generating leakage current with other lines, thereby further reducing the leakage current generated between the signal lines of the main signal transmission layer in the transmission module 1. The left and right sides described here are only based on Figure 3 The positional relationship is not limited to the left and right sides, as long as they are arranged on both sides in relative directions. It should be noted that in the main signal transmission layer 11, the first internal protection line 112 and the second internal protection line 113 can be symmetrically arranged with the main signal transmission line 111 as the center, and the first middle protection line 114 and the second middle protection line 115 can be symmetrically arranged with the main signal transmission line 111 as the center. However, in other cases, the first internal protection line 112, the second internal protection line 113, the first middle protection line 114 and the second middle protection line 115 only need to be arranged on both sides of the main signal transmission line 111, and the technical effects of the disclosed embodiments of the present invention can also be achieved.

[0025] The main signal transmission line 111 is used to transmit the first main signal Force+ to obtain the second main signal F+, and transmit the remote sampling signal S+ with the same voltage as the second main signal F+ to the first internal protection line 112 and the second internal protection line 113. The first internal protection line 112 and the second internal protection line 113 are respectively used to transmit the remote sampling signal S+ and obtain the first sampling signal Vsense+. The first intermediate protection line 114 and the second intermediate protection line 115 are respectively used to transmit the protection signal Guard. The protection signal Guard is related to the first sampling signal Vsense+. The voltage of ense+ is equal, the first external protection line 116 and the second external protection line 117 are connected to the ground signal AGND. Specifically, the A end of the main signal transmission line 111 receives the first main signal Force+, and transmits the first main signal Force+ from the A end of the main signal transmission line 111 to the B end of the main signal transmission line 111 to obtain the second main signal F+ (because the main signal transmission line 111 has a resistor, Force+ will have a voltage drop change on the main signal transmission line 111, and F+ is used to refer to Force+ after the voltage drop change). The remote sampling signal S+ and the second main signal F+ are signals collected at different locations, but the voltage of the remote sampling signal S+ and the second main signal F+ are equal. The remote sampling signal S+ is transmitted from the B end of the first internal protection line 112 to the A end of the first internal protection line 112 and from the B end of the second internal protection line 113 to the A end of the second internal protection line 113, and the first sampling signal Vsense+ is obtained. (Since the first internal protection line 112 and the second internal protection line 113 have resistance, there will be a certain voltage drop in the process of transmitting the remote sampling signal S+. The sampling signal S+ will become the first sampling signal Vsense+, but this voltage drop is very small). The A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115 receive the protection signal Guard and transmit the protection signal Guard from their respective A ends to their respective B ends. The voltage of the protection signal Guard is equal to that of the first sampling signal Vsense+. The A end of the first external protection line 116 and the A end of the second external protection line 117 are connected to the ground signal AGND and transmit the ground signal AGND from their respective A ends to their respective B ends.

[0026] The transmission module 1 disclosed in the embodiment of the present disclosure sets a first internal protection line 112 and a second internal protection line 113 on both sides of the main signal transmission line 111 in the main signal transmission layer 11, both of which are used to transmit a remote sampling signal S+ with a voltage equal to the second main signal F+ transmitted from the main signal transmission line 111, and obtain a first sampling signal Vsense+. The first intermediate protection line 114 and the second intermediate protection line 115 are both used to transmit a protection signal Guard with a voltage equal to the first sampling signal, so that the voltage difference between the first internal protection line 112 and the first intermediate protection line 114 and the voltage difference between the second internal protection line 113 and the second intermediate protection line 115 are very small and almost zero. Therefore, the leakage current generated between the first internal protection line 112 and the first intermediate protection line 114 and between the second internal protection line 113 and the second intermediate protection line 115 is very small and almost zero. The leakage current of the main signal transmission layer 11 of the transmission module 1 is very small, thereby reducing the leakage current generated in the transmission module 1. At the same time, a first external protection line 116 and a second external protection line 117 connected to the ground signal AGND are provided to reduce electromagnetic interference to the signal in the main signal transmission line.

[0027] In some embodiments, the transmission module 1 further includes a first internal protective layer 12 and a second internal protective layer 13 stacked with the main signal transmission layer 11, and the first internal protective layer 12 and the second internal protective layer 13 are respectively arranged on both sides of the main signal transmission layer 11; further, the first internal protective layer 12 and the second internal protective layer 13 are arranged on the upper and lower sides of the main signal transmission layer 11, and the upper and lower sides described here are relative, as long as they are arranged on both sides in the relative directions; the first internal protective layer 12 includes a third intermediate protective line 122, a third internal protective line 121, and a first internal protective line 123 extending in the same direction. The fourth middle protection line 123, the third outer protection line 124 and the fourth outer protection line 125 are arranged on both sides of the third inner protection line 121, the third middle protection line 122 is arranged between the third outer protection line 124 and the third inner protection line 121, and the fourth middle protection line 123 is arranged between the fourth outer protection line 125 and the third inner protection line 121. In addition, in a direction perpendicular to the first inner protection layer 12, the third inner protection line 121 covers the main signal transmission line 111. Specifically, the third inner protection line 121 can be arranged perpendicular to the first inner protection layer 12. In the direction of the first internal protection layer 12, the orthographic projection of the third internal protection line 121 covers the orthographic projection of the main signal transmission line 111, and the orthographic projection of the third internal protection line 121 overlaps at least partially with the orthographic projection of the first internal protection line 112 and the orthographic projection of the second internal protection line 113, respectively. In the direction perpendicular to the main signal transmission line 111 and the third internal protection line 121, the main signal transmission line 111 will not cross the third internal protection line 121 and generate leakage current with other lines, especially reducing the leakage current between the main signal transmission layer 11 and the first internal protection layer 12, ensuring further reduction. The leakage current generated in the transmission module is reduced; further, in the first internal protection layer 12, a third intermediate protection line 122, a fourth intermediate protection line 123, a third external protection line 124 and a fourth external protection line 125 are arranged on the left and right sides of the third internal protection line 121, that is, the third intermediate protection line 122 and the third external protection line 124 are on the left side of the third internal protection line 121, and the fourth intermediate protection line 123 and the fourth external protection line 125 are on the right side of the third internal protection line 121. The left and right sides described here are relative, and it is sufficient to arrange them on both sides in relative directions.

[0028] The second inner protective layer 13 includes a fifth middle protective line 132, a fourth inner protective line 131, a sixth middle protective line 133, a fifth outer protective line 134, and a sixth outer protective line 135 extending in the same direction. The fifth outer protective line 134 and the sixth outer protective line 135 are arranged on both sides of the fourth inner protective line 131. The fifth middle protective line 132 is arranged between the fifth outer protective line 134 and the fourth inner protective line 131. The sixth middle protective line 133 is arranged between the sixth outer protective line 135 and the fourth inner protective line 131. In a direction perpendicular to the second inner protective layer 13, the fourth inner protective line 131 covers the main signal transmission line 111. Specifically, in a direction perpendicular to the second inner protective layer 13, the orthographic projection of the fourth inner protective line 131 covers the orthographic projection of the main signal transmission line 111, and the orthographic projection of the fourth inner protective line 131 is respectively aligned with the orthographic projection of the first inner protective line 112. and the positive projection of the second internal protection line 113 at least partially overlap, in the direction perpendicular to the main signal transmission line 111 and the fourth internal protection line 131, so that the main signal transmission line 111 will not cross the fourth internal protection line 131 and generate leakage current with other lines, especially reducing the leakage current between the main signal transmission layer 11 and the second protection layer 13, and further reducing the leakage current generated in the transmission module; further, in the second internal protection layer 13, a fifth intermediate protection line 132, a sixth intermediate protection line 133, a fifth external protection line 134 and a sixth external protection line 135 are arranged on the left and right sides of the fourth internal protection line 131, the fifth intermediate protection line 132 and the fifth external protection line 134 are on the left side of the fourth internal protection line 131, and the sixth intermediate protection line 133 and the sixth external protection line 135 are on the right side of the fourth internal protection line 131. The left and right sides described here are relative, as long as they are arranged on both sides in relative directions.It should be noted that the first internal protection layer 12 and the second internal protection layer 13 can be symmetrically arranged with the main signal transmission layer 11 as the center, but in other cases, the first internal protection layer 12 and the second internal protection layer 13 only need to be arranged on both sides of the main signal transmission layer 11, and the technical effects of the embodiments disclosed in the present invention can also be achieved; the third intermediate protection line 122 and the fourth intermediate protection line 123 can be symmetrically arranged with the third internal protection line 121 as the center, and the third external protection line 124 and the fourth external protection line 125 can be symmetrically arranged with the third internal protection line 121 as the center, but in other cases, the third intermediate protection line 122, the fourth intermediate protection line 123, the third external protection line 124 and the fourth external protection line 125 only need to be respectively arranged on both sides of the third internal protection line 121, and the technical effects of the embodiments disclosed in the present invention can also be achieved; the fifth intermediate protection line 132 and the sixth middle protection line 133 can be symmetrically arranged with the fourth inner protection line 131 as the center, and the fifth outer protection line 134 and the sixth outer protection line 135 can be symmetrically arranged with the fourth inner protection line 131 as the center. However, in other cases, the fifth middle protection line 132, the sixth middle protection line 133, the fifth outer protection line 134 and the sixth outer protection line 135 only need to be respectively arranged on both sides of the fourth inner protection line 131, and the technical effects of the disclosed embodiments of the present invention can also be achieved; in addition, the orthographic projections of the third inner protection line 121 at least partially overlap with the orthographic projections of the first inner protection line 112 and the second inner protection line 113, respectively, and the orthographic projections of the fourth inner protection line 131 at least partially overlap with the orthographic projections of the first inner protection line 112 and the second inner protection line 113, respectively. The "at least partially overlapping" described here can be complete overlapping or even covering.

[0029] The third internal protection line 121 and the fourth internal protection line 131 are respectively used to transmit the remote sampling signal S+ and obtain the first sampling signal Vsense+. The third intermediate protection line 122, the fourth intermediate protection line 123, the fifth intermediate protection line 132, and the sixth intermediate protection line 133 are respectively used to transmit the protection signal Guard. The third external protection line 124, the fourth external protection line 125, the fifth external protection line 134, and the sixth external protection line 135 are all connected to the ground signal AGND. Specifically, a signal equal to the voltage of the second main signal F+ is transmitted as the remote sampling signal S+ from the B end of the third internal protection line 121 to the A end of the third internal protection line 121, and is transmitted from the B end of the fourth internal protection line 131 to the A end of the fourth internal protection line 131, and the first sampling signal Vsense+ is obtained. The A end of the third intermediate protection line 122, the A end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, and the A end of the sixth intermediate protection line 133 receive the protection signal Guard and transmit the protection signal Guard from their respective A ends to their respective B ends. The protection signal Guard has the same voltage as the first sampling signal Vsense+. The A end of the third external protection line 124, the A end of the fourth external protection line 125, the A end of the fifth external protection line 134, and the A end of the sixth external protection line 135 are all connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends. In this embodiment, the main signal transmission line 111 in the main signal transmission layer 11 does not cross the third internal protection line 121 and generate leakage current with other lines. Furthermore, the main signal transmission line 111 does not cross the fourth internal protection line 131 and generate leakage current with other lines. This particularly reduces leakage current between the main signal transmission layer 11 and the first internal protection layer 12, and also reduces leakage current between the main signal transmission layer 11 and the second internal protection layer 13. Furthermore, within the first internal protection layer 12, the voltage differential between the third internal protection line 121 and the third intermediate protection line 122, and between the third internal protection line 121 and the fourth intermediate protection line 123 is very small, nearly zero. Consequently, the voltage differential between the third internal protection line 121 and the third intermediate protection line 122, and between the third internal protection line 121 and the fourth intermediate protection line 123 is very small, nearly zero. Consequently, leakage current in the first internal protection layer 12 of the transmission module is very low, and similarly, leakage current in the second internal protection layer 13 is also very low, further reducing leakage current in the transmission module 1. Meanwhile, a third outer protection line 124 and a fourth outer protection line 125 are provided in the first inner protection layer 12 , and a fifth outer protection line 134 and a sixth outer protection line 135 are provided in the second inner protection layer 13 , which can reduce electromagnetic interference.

[0030] In some embodiments, the transmission module 1 further includes a first intermediate protective layer 14 stacked with the first internal protective layer 12 and a second intermediate protective layer 15 stacked with the second internal protective layer 13. The first internal protective layer 12 is arranged between the main signal transmission layer 11 and the first intermediate protective layer 14, and the second internal protective layer 13 is arranged between the main signal transmission layer 11 and the second intermediate protective layer 15. Furthermore, the first intermediate protective layer 14 and the second intermediate protective layer 15 are arranged on the upper and lower sides of the main signal transmission layer 11. The upper and lower sides described here are relative, as long as they are arranged on both sides in the relative directions. The first intermediate protective layer 14 includes a seventh intermediate protective line 141, a seventh external protective line 142, and an eighth external protective line 143 extending in the same direction. The seventh outer protection line 143, the seventh outer protection line 142 and the eighth outer protection line 143 are arranged on both sides of the seventh middle protection line 141, and in the direction perpendicular to the first middle protection layer 14, the seventh middle protection line 141 covers the third inner protection line 121. Specifically, in the direction perpendicular to the first middle protection layer 14, the orthographic projection of the seventh middle protection line 141 covers the orthographic projection of the third inner protection line 121, and the orthographic projection of the seventh middle protection line 141 at least partially overlaps with the orthographic projection of the third middle protection line 122 and the orthographic projection of the fourth middle protection line 123, respectively. In the direction perpendicular to the third inner protection line 121 and the seventh middle protection line 141, the third inner protection line 121 does not cross the seventh middle protection line The line 141 generates leakage current with other lines, especially reducing the leakage current between the first intermediate protection layer 14 and the first internal protection layer 12, further reducing the leakage current generated in the transmission module; further, the seventh external protection line 142 and the eighth external protection line 143 are arranged on the left and right sides of the seventh intermediate protection line 141. The left and right sides described here are relative, as long as they are arranged on both sides in the relative directions; the second intermediate protection layer 15 includes an eighth intermediate protection line 151, a ninth external protection line 152 and a tenth external protection line 153 extending in the same direction. The ninth external protection line 152 and the tenth external protection line 153 are arranged on both sides of the eighth intermediate protection line 151 and in a direction perpendicular to the second intermediate protection layer 15. The eighth middle protection line 151 covers the fourth inner protection line 131. Specifically, in a direction perpendicular to the second middle protection layer 15, the orthographic projection of the eighth middle protection line 151 covers the orthographic projection of the fourth inner protection line 131, and the orthographic projection of the eighth middle protection line 151 at least partially overlaps with the orthographic projections of the fifth middle protection line 132 and the sixth middle protection line 133, respectively. In a direction perpendicular to the fourth inner protection line 131 and the eighth middle protection line 151, the fourth inner protection line 131 does not cross the eighth middle protection line 151 and generate leakage current with other lines. This can particularly reduce leakage current between the second middle protection layer 15 and the second inner protection layer 13, further reducing leakage current generated in the transmission module 1.Furthermore, the ninth external protection line 152 and the tenth external protection line 153 are arranged on the left and right sides of the eighth intermediate protection line 151. The left and right sides described here are relative, and they can be arranged symmetrically on both sides in relative directions. It should be noted that the first intermediate protection layer 14 and the second intermediate protection layer 15 can be symmetrically arranged with the main signal transmission layer 11 as the center, but in other cases, the first intermediate protection layer 14 and the second intermediate protection layer 15 only need to be arranged on both sides of the main signal transmission layer 11, and the technical effects of the embodiments disclosed in the present invention can also be achieved; the seventh external protection line 142 and the eighth external protection line 143 can be symmetrically arranged with the seventh intermediate protection line 141 as the center, but in other cases, the seventh external protection line 142 and the eighth external protection line 143 only need to be respectively arranged on both sides of the seventh intermediate protection line 141, and the technical effects of the embodiments disclosed in the present invention can also be achieved; the ninth external protection line 152 The ninth and tenth outer protection lines 152 and 153 may be symmetrically arranged about the eighth middle protection line 151. However, in other cases, the ninth and tenth outer protection lines 152 and 153 only need to be arranged on either side of the eighth middle protection line 151 to still achieve the technical effects of the disclosed embodiments of the present invention. Furthermore, the orthographic projection of the seventh middle protection line 141 at least partially overlaps with the orthographic projections of the third and fourth middle protection lines 122 and 123, respectively. The orthographic projection of the eighth middle protection line 151 at least partially overlaps with the orthographic projections of the fifth and sixth middle protection lines 132 and 133, respectively. The phrase "at least partially overlapping" herein may include complete overlap or even overlapping.

[0031] The seventh intermediate protection line 141 and the eighth intermediate protection line 151 are each used to transmit a protection signal Guard. The seventh external protection line 142, the eighth external protection line 143, the ninth external protection line 152, and the tenth external protection line 153 are all connected to the ground signal AGND. Specifically, the A terminals of the seventh intermediate protection line 141 and the eighth intermediate protection line 151 receive the protection signal Guard and transmit the protection signal Guard from their respective A terminals to their respective B terminals. The A terminals of the seventh external protection line 142, the eighth external protection line 143, the ninth external protection line 152, and the tenth external protection line 153 are connected to the ground signal AGND and transmit the ground signal AGND from their respective A terminals to their respective B terminals. In this embodiment, a first intermediate protective layer and a second intermediate protective layer are provided, which can reduce the leakage current between the first internal protective layer and the first intermediate protective layer, and at the same time reduce the leakage current between the second internal protective layer and the second intermediate protective layer, further reducing the leakage current of the transmission module 1; at the same time, different external protection lines are respectively provided in the first intermediate protective layer and the second intermediate protective layer, which can avoid external electromagnetic interference during signal transmission.

[0032] In some embodiments, as Figure 4 As shown, the transmission module 1 also includes a first external protective layer 16 stacked with the first intermediate protective layer 14 and a second external protective layer 17 stacked with the second intermediate protective layer 15. The first intermediate protective layer 14 is arranged between the first internal protective layer 12 and the first external protective layer 16, and the second intermediate protective layer 15 is arranged between the second internal protective layer 13 and the second external protective layer 17. Further, the first external protective layer 16 and the second external protective layer 17 are arranged on the upper and lower sides of the main signal transmission layer 11. The upper and lower sides described here are relative, as long as they are arranged on both sides in relative directions. The first external protective layer 16 is an eleventh external protection line 161. In the direction perpendicular to the first external protective layer 16, the eleventh external protection line 161 covers the seventh intermediate protection line 141. Specifically, in the direction perpendicular to the first external protective layer 16, the orthographic projection of the eleventh external protection line 161 covers The seventh middle protection line 141, and the orthographic projection of the eleventh external protection line 161 at least partially overlap with the orthographic projection of the seventh external protection line 142 and the orthographic projection of the eighth external protection line 143 respectively; the second external protection layer 17 is the twelfth external protection line 171, and in the direction perpendicular to the second external protection layer 17, the twelfth external protection line 171 covers the eighth middle protection line 151, specifically, in the direction perpendicular to the second external protection layer 17, the orthographic projection of the twelfth external protection line 171 covers the eighth middle protection line 151, and the orthographic projection of the twelfth external protection line 171 at least partially overlaps with the orthographic projection of the ninth external protection line 152 and the orthographic projection of the tenth external protection line 153 respectively; the A end of the eleventh external protection line 161 and the A end of the twelfth external protection line 171 are connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends. It should be noted that the orthographic projection of the eleventh external protection line 161 at least partially overlaps with the orthographic projection of the seventh external protection line 142 and the orthographic projection of the eighth external protection line 143, and the orthographic projection of the twelfth external protection line 171 at least partially overlaps with the orthographic projection of the ninth external protection line 152 and the orthographic projection of the tenth external protection line 153. The "at least partial overlap" described here can be complete overlap or even covering.

[0033] In some embodiments, as Figure 4As shown, the first outer protection line 116, the second outer protection line 117, the third outer protection line 124, the fourth outer protection line 125, the fifth outer protection line 134, the sixth outer protection line 135, the seventh outer protection line 142, the eighth outer protection line 143, the ninth outer protection line 152, the tenth outer protection line 153, the eleventh outer protection line 161 and the twelfth outer protection line 171 together form an outer shielding ring wrapped by the first middle protection line 114, the second middle protection line 115, the third middle protection line 122, the fourth middle protection line 123, the The intermediate shielding ring composed of the fifth intermediate protection line 132, the sixth intermediate protection line 133, the seventh intermediate protection line 141 and the eighth intermediate protection line 151, the intermediate shielding ring wrapped around the internal shielding ring composed of the first internal protection line 112, the second internal protection line 113, the third internal protection line 121 and the fourth internal protection line 131, and the internal shielding ring wrapped around the main signal transmission line 111. This arrangement can enhance leakage protection and electromagnetic shielding, reduce interference to related signals, make related signals more complete and stable during transmission, and improve signal transmission quality. It should also be noted that in the direction perpendicular to the main signal transmission layer 11, the first external protection line 116, the third external protection line 124, the seventh external protection line 142, the fifth external protection line 134, and the ninth external protection line 152 are at least partially overlapped, for example, their respective orthographic projections in the direction perpendicular to the main signal transmission layer 11 completely coincide with each other, and the second external protection line 117, the fourth external protection line 125, the eighth external protection line 143, the sixth external protection line 135, and the tenth external protection line 153 are also at least partially overlapped, for example, their respective orthographic projections in the direction perpendicular to the main signal transmission layer 11 completely coincide with each other. This arrangement ensures a better electromagnetic shielding effect.

[0034] In some embodiments, the main signal transmission layer 11 and the first inner protective layer 12, the main signal transmission layer 11 and the second inner protective layer 13, the first inner protective layer 12 and the first intermediate protective layer 14, the second inner protective layer 13 and the second intermediate protective layer 15, the first intermediate protective layer 14 and the first outer protective layer 16, and the second intermediate protective layer 15 and the second outer protective layer 17 are all isolated by insulating materials, and the main signal transmission line 111 and the first inner protective line 112, the main signal transmission line 111 and the second inner protective line 113, the first inner protective line 112 and the first intermediate protective line 114, the second inner protective line 113 and the second intermediate protective line 115, the first intermediate protective line 114 and the first outer protective line 116, the second intermediate protective line 115 and the second outer protective line 117, and the third inner protective line 118 are separated. The inner protective wire 121 and the third middle protective wire 122, the third inner protective wire 121 and the fourth middle protective wire 123, the third middle protective wire 122 and the third outer protective wire 124, the fourth middle protective wire 123 and the fourth outer protective wire 125, the fourth inner protective wire 131 and the fifth middle protective wire 132, the fourth inner protective wire 131 and the sixth middle protective wire 133, the fifth middle protective wire 132 and the fifth outer protective wire 134, the sixth middle protective wire 133 and the sixth outer protective wire 135, the seventh middle protective wire 141 and the seventh outer protective wire 142, the seventh middle protective wire 141 and the eighth middle protective wire 151, the eighth middle protective wire 151 and the ninth outer protective wire 152, and the eighth middle protective wire 151 and the tenth outer protective wire 153 are all isolated by insulating materials. It should be noted that Figure 3 The main signal transmission line 111, the first internal protection line 112, the second internal protection line 113, the first intermediate protection line 114, the second intermediate protection line 115, the first external protection line 116, the second external protection line 117 and the transmission module 1 are shown. Figure 4The signal transmission line 111, the first internal protection line 112, the second internal protection line 113, the first intermediate protection line 114, the second intermediate protection line 115, the first external protection line 116, the second external protection line 117, the third internal protection line 121, the third intermediate protection line 122, the fourth intermediate protection line 123, the third external protection line 124, the fourth external protection line 125, the fourth internal protection line 131, the fifth intermediate protection line 132, the sixth intermediate protection line 133, the fifth external protection line 134, the sixth external protection line 135, the seventh intermediate protection line 141, the seventh external protection line 142, the eighth external protection line 143, the eighth intermediate protection line 151, the ninth external protection line 152, the tenth external protection line 153, the eleventh external protection line 161 and the twelfth external protection line 171 in the transmission module 1 are all wrapped with insulating material, and no side is exposed to the external environment. Figure 3 and Figure 4 Not fully represented.

[0035] like Figure 5 As shown, the embodiment of the present disclosure also discloses a transmission circuit, which is connected to an external source circuit 2 and a load circuit 3, including Figure 3In the transmission module 1 and the first driving isolation module 4 shown, the external source circuit 2 sends a first main signal Force+ and transmits the first main signal Force+ to the A end of the main signal transmission line 111. The main signal transmission line 111 transmits the first main signal Force+ from the A end of the main signal transmission line 111 to the B end of the main signal transmission line 111, and transmits the first main signal Force+ from the B end of the main signal transmission line 111 to the first end of the load circuit 3 to obtain the second main signal F+. The voltage signal of the first end of the load circuit 3 equal to the voltage of the second main signal F+ is used as the remote sampling signal S+, but the current of the remote sampling signal S+ is very The first end of the load circuit 3 transmits the remote sampling signal S+ to the B end of the first internal protection line 112 and the second internal protection line 113. During the process of the remote sampling signal S+ being transmitted from the B end of the first internal protection line 112 to the A end of the first internal protection line 112, and the remote sampling signal S+ being transmitted from the B end of the second internal protection line 113 to the A end of the second internal protection line 113, the first internal protection line 112 and the second internal protection line 113 have resistances, which will result in a certain voltage drop (it should be noted that this voltage drop is very small). The remote sampling signal S+ will change and become the first sampling signal Vsense. +, the first sampling signal Vsense+ is transmitted from the A end of the first internal protection line 112 and the A end of the second internal protection line 113 to the input end of the first driving isolation module 4, and the first driving isolation module 4 converts the received first sampling signal Vsense+ into a protection signal Guard having a voltage equal to the received first sampling signal Vsense+ (the voltages of the first sampling signal Vsense+ and the protection signal Guard recorded here are equal in theory. In practice, due to the voltage drop on the transmission line and the error of the first driving isolation module 4, the actual voltages of the first sampling signal Vsense+ and the protection signal Guard are different. The first drive isolation module 4 is not equal to the first drive isolation module 4, but the difference between the two is very small and can be ignored, so they are stated as equal here), and transmits the protection signal Guard from the output end of the first drive isolation module 4 to the A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115. The A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115 receive the protection signal Guard output by the first drive isolation module 4, and transmit the protection signal Guard from their respective A ends to their respective B ends. The first drive isolation module 4 is further used to isolate the current input from the input end of the first drive isolation module 4 from the current output from the output end of the first drive isolation module 4.

[0036] In some embodiments, the connection relationship of the transmission circuit is: the external source circuit 2 is electrically connected to the first end of the main signal transmission line 111, the second end of the main signal transmission line 111 is electrically connected to the first end of the load circuit 3, the second end of the first internal protection line 112 and the second end of the second internal protection line 113 are respectively electrically connected to the first end of the load circuit 3, the first end of the first internal protection line 112 and the first end of the second internal protection line 113 are respectively electrically connected to the input end of the first drive isolation module 4, and the output end of the first drive isolation module 4 is electrically connected to the first intermediate protection line 114 and the second intermediate protection line 115. Specifically, the external source circuit 2 is electrically connected to the A end of the main signal transmission line 111, the B end of the main signal transmission line 111 is electrically connected to the first end of the load circuit 3, the B end of the first internal protection line 112 and the B end of the second internal protection line 113 are respectively electrically connected to the first end of the load circuit 3, the A end of the first internal protection line 112 and the A end of the second internal protection line 113 are respectively electrically connected to the input end of the first driving isolation module 4, the output end of the first driving isolation module 4 is electrically connected to the A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115, the B end of the first intermediate protection line 114 is connected to the B end of the second intermediate protection line 115, the second end of the load circuit 3 is connected to the ground signal AGND, and can actually also be connected to other circuits as needed. The A ends of the first external protection line 116 and the second external protection line 117 are both connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends.

[0037] In the transmission circuit disclosed in the embodiment of the present disclosure, since the voltage of the first sampling signal Vsense+ obtained through the first internal protection line 112 and the second internal protection line 113 is equal to the voltage of the protection signal Guard output to the first intermediate protection line 114 and the second intermediate protection line 115, the voltage difference between the first internal protection line 112 and the first intermediate protection line 114 and the voltage difference between the second internal protection line 113 and the second intermediate protection line 115 are very small and almost zero. Therefore, the leakage current generated due to the voltage difference between the first internal protection line 112 and the first intermediate protection line 114 and between the second internal protection line 113 and the second intermediate protection line 115 is also very small and almost zero, thereby reducing the leakage current generated in the transmission circuit. In addition, the leakage current generated between the main signal transmission line 111 and the first internal protection line 112 flows to the input end of the first drive isolation module 4, the first intermediate protection line 114 and the load circuit 3, and the main signal transmission line 111 and the second internal protection line 115. The leakage current generated between the guard lines 113 flows to the input end of the first driving isolation module 4, the second intermediate protection line 115 and the load circuit 3. However, since the first isolation module is used to isolate the current input from the input end of the first driving isolation module 4 from the current output from the output end of the first driving isolation module 4, the leakage current flowing to the input end of the first driving isolation module 4 is very small, and the voltage of the first sampling signal Vsense+ is equal to the voltage of the protection signal Guard output to the first intermediate protection line 114 and the second intermediate protection line 115. Therefore, the leakage current between the first internal protection line 112 and the first intermediate protection line 114 and the leakage current between the second internal protection line 113 and the second intermediate protection line 115 is very small and almost zero. Therefore, most of the leakage current generated between the main signal transmission line 111 and the first internal protection line 112 and between the main signal transmission line 111 and the second internal protection line 113 flows to the load circuit 3, which further reduces the leakage current generated in the transmission circuit.

[0038] In some embodiments, the second end of the third internal protection line 121 and the second end of the fourth internal protection line 131 are respectively electrically connected to the first end of the load circuit 3, the first end of the third internal protection line 121 and the first end of the fourth internal protection line 131 are respectively electrically connected to the input end of the first driver isolation module 4, and are both used to transmit the remote sampling signal S+ and obtain the first sampling signal Vsense+. The output end of the first driver isolation module 4 is respectively electrically connected to the third intermediate protection line 122, the fourth intermediate protection line 123, the fifth intermediate protection line 132 and the sixth intermediate protection line 133, and are respectively used to transmit the protection signal Guard. The third external protection line 124, the fourth external protection line 125, the fifth external protection line 134 and the sixth external protection line 135 are all connected to the ground signal AGND.Specifically, the B end of the third internal protection line 121 and the B end of the fourth internal protection line 131 are respectively electrically connected to the first end of the load circuit 3, and the A end of the third internal protection line 121 and the A end of the fourth internal protection line 131 are respectively electrically connected to the input end of the first drive isolation module 4. The A end of the third internal protection line 121 and the A end of the fourth internal protection line 131 transmit the second main signal F+ from the first end of the load circuit 3 as the remote sampling signal S+ to their respective B ends, and obtain the first sampling signal Vsense+, and transmit the first sampling signal Vsense+ from their respective B ends to the first drive isolation module 4. The output end of the first driving isolation module 4 is also electrically connected to the A end of the third intermediate protection line 122, the A end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, and the A end of the sixth intermediate protection line 133, respectively, to convert the received first sampling signal Vsense+ into a protection signal Guard with a voltage equal to the first sampling signal Vsense+, and transmit the protection signal Guard to the A end of the third intermediate protection line 122, the A end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, and the A end of the sixth intermediate protection line 133, and then transmit the protection signal Guard from the A end of each of the three intermediate protection lines. The ends are transmitted to their respective B ends. The A end of the first intermediate protection line 114, the A end of the second intermediate protection line 115, the A end of the third intermediate protection line 122, the A end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, and the A end of the sixth intermediate protection line 133 can be connected together. For example, they can be connected through the via holes provided in the transmission module 1. The B end of the first intermediate protection line 114, the B end of the second intermediate protection line 115, the B end of the third intermediate protection line 122, the B end of the fourth intermediate protection line 123, the B end of the fifth intermediate protection line 132, and the B end of the sixth intermediate protection line 133 can be connected together. For example, The A end of the third external protection line 124, the A end of the fourth external protection line 125, the A end of the fifth external protection line 134 and the A end of the sixth external protection line 135 can be connected through the via hole of the transmission module 1, and the ground signal AGND is transmitted to the respective B ends. The B end of the first external protection line 116, the B end of the second external protection line 117, the B end of the third external protection line 124, the B end of the fourth external protection line 125, the B end of the fifth external protection line 134 and the B end of the sixth external protection line 135 can be connected together, for example, through the via hole of the transmission module 1.

[0039] In some embodiments, the output ends of the first drive isolation module 4 are electrically connected to the seventh intermediate protection line 141 and the eighth intermediate protection line 151, and are respectively used to transmit the protection signal Guard. The seventh external protection line 142, the eighth external protection line 143, the ninth external protection line 152 and the tenth external protection line 153 are all connected to the ground signal AGND. Specifically, the output ends of the first driving isolation module 4 are electrically connected to the A end of the seventh intermediate protection line 141 and the A end of the eighth intermediate protection line 151. The A end of the seventh intermediate protection line 141 and the A end of the eighth intermediate protection line 151 receive the protection signal Guard converted from the first sampling signal Vsense+ by the first driving isolation module 4, and transmit the protection signal Guard to their respective B ends. The A end of the first intermediate protection line 114, the A end of the second intermediate protection line 115, the A end of the third intermediate protection line 122, the A end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, the A end of the sixth intermediate protection line 133, the A end of the seventh intermediate protection line 141 and the A end of the eighth intermediate protection line 151 can be connected together. For example, the B end of the first intermediate protection line 114, the B end of the second intermediate protection line 115, the B end of the third intermediate protection line 122, the B end of the fourth intermediate protection line 123, the A end of the fifth intermediate protection line 132, the A end of the sixth intermediate protection line 133, the A end of the seventh intermediate protection line 141 and the A end of the eighth intermediate protection line 151 can be connected together. For example, the B end of the first intermediate protection line 114, the B end of the second intermediate protection line 115, the B end of the third intermediate protection line 122, the B end of the fourth intermediate protection line 123, the B end of the fifth intermediate protection line The B end of the line 132, the B end of the sixth intermediate protection line 133, the B end of the seventh intermediate protection line 141, and the B end of the eighth intermediate protection line 151 can be connected together, for example, through the via hole provided by the transmission module 1, and the A end of the seventh external protection line 142, the A end of the eighth external protection line 143, the A end of the ninth external protection line 152, and the A end of the tenth external protection line 153 are all connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends. The B ends of the first external protection line 116, the B end of the second external protection line 117, the B end of the third external protection line 124, the B end of the fourth external protection line 125, the B end of the fifth external protection line 134, the B end of the sixth external protection line 135, the B end of the seventh external protection line 142, the B end of the eighth external protection line 143, the B end of the ninth external protection line 152 and the B end of the tenth external protection line 153 can be connected together, specifically, they can be connected through the via holes provided in the transmission module 1.

[0040] In some embodiments, the eleventh external protection line 161 and the twelfth external protection line 171 are both connected to the ground signal AGND, the A end of the eleventh external protection line 161 and the A end of the twelfth external protection line 171 are both connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends, the B end of the first external protection line 116, the B end of the second external protection line 117, the B end of the third external protection line 124, the B end of the fourth external protection line 125, the B end of the fifth external protection line 134, the B end of the sixth external protection line 135, the B end of the seventh external protection line 142, the B end of the eighth external protection line 143, the B end of the ninth external protection line 152, the B end of the tenth external protection line 153, the B end of the eleventh external protection line 161 and the B end of the twelfth external protection line 171 can be connected together, specifically through the vias provided by the transmission module 1.

[0041] like Figure 6 As shown, in some embodiments, the transmission circuit is used to connect the voltage measurement module 6, and the transmission circuit also includes a second drive isolation module 5. At this time, the transmission module 1 included in the transmission circuit is only shown as the main signal transmission layer 11. Figure 3In the transmission module 1 shown, the input end of the second driving isolation module 5 receives the first sampling signal Vsense+ transmitted from the A end of the first internal protection line 112 and the A end of the second internal protection line 113. The second driving isolation module 5 converts the first sampling signal Vsense+ into a second sampling signal Vsense with a voltage equal to the first sampling signal Vsense+ (the voltages of the first sampling signal Vsense+ and the second sampling signal Vsense recorded here are theoretically equal, but in reality there will be a certain difference, but the difference is very small and can be ignored), and outputs it from the output end of the second driving isolation module 5 to the voltage measurement module 6 and the input end of the first driving isolation module 4. The first driving isolation module 4 converts the received second sampling signal Vsense into a protection signal Guard with a voltage equal to the received second sampling signal Vsense (the voltages of the second sampling signal Vsense and the protection signal Guard recorded here are also theoretically equal, but in reality there will be a certain difference, but the difference is very small and can be ignored). The first and second intermediate protection lines 114 and 115 transmit the protection signal Guard to their respective B terminals. The second driver isolation module 5 is further configured to isolate the current input from the input terminal of the second driver isolation module 5 from the current output from the output terminal of the second driver isolation module 5. The voltage measurement module 6 is configured to measure the voltage value of the second sampling signal Vsense. The addition of the second driver isolation module 5 is to further isolate other interference during the test of the second sampling signal Vsense to ensure accurate measurement. In addition, most of the leakage current generated between the main signal transmission line 111 and the first and second internal protection lines 112 and 113 will return to the load circuit 3 and be transmitted to the voltage measurement module 6 as part of the first sampling signal Vsense+ through the first and second internal protection lines 112 and 113 and the second driver isolation module 5.

[0042] The electrical connection relationship between the second driving isolation module 5 and the voltage measurement module 6 and the external source circuit 2, the load circuit 3, the main signal transmission line 111, the first internal protection line 112, the second internal protection line 113, the first intermediate protection line 114 and the second intermediate protection line 115 is as follows: the external source circuit 2 is electrically connected to the A end of the main signal transmission line 111, the B end of the main signal transmission line 111 is electrically connected to the first end of the load circuit 3, the B end of the first internal protection line 112 and the B end of the second internal protection line 113 are electrically connected to the first end of the load circuit 3, the A end of the first internal protection line 112 and the A end of the second internal protection line 113 are electrically connected to the input end of the second driving isolation module 5, the output end of the second driving isolation module 5 is electrically connected to the voltage measurement module 6, the output end of the second driving isolation module 5 is also electrically connected to the input end of the first driving isolation module 4, and the output end of the first driving isolation module 4 is electrically connected to the A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115.

[0043] It should be noted that, in some embodiments, the first end of the third internal protection line 121 and the first end of the fourth internal protection line 131 are respectively connected to the input end of the second drive isolation module 5, that is, the A end of the third internal protection line 121 and the A end of the fourth internal protection line 131 are respectively connected to the input end of the second drive isolation module 5.

[0044] In some embodiments, the first drive isolation module 4 is a first precision voltage drive module, and the second drive isolation module 5 is a second precision voltage drive module. The output end of the second precision voltage drive module tracks the voltage of the first sampling signal Vsense+ received at the input end of the second precision voltage drive module in real time, so that the voltage of the second sampling signal Vsense output by the second precision voltage drive module and the voltage of the input first sampling signal Vsense+ are within the error range of the second precision voltage drive module. The output end of the first precision voltage drive module tracks the voltage of the second sampling signal Vsense received at the input end of the first precision voltage drive module in real time, so that the voltage of the protection signal Guard output by the first precision voltage drive module and the voltage of the input second sampling signal Vsense are within the error range of the first precision voltage drive module. This arrangement further ensures that the voltage difference between the first internal protection line 112 and the first intermediate protection line 114 and the voltage difference between the second internal protection line 113 and the second intermediate protection line 115 are within a very small range, further reducing the leakage current caused by the voltage difference between the first internal protection line 112 and the first intermediate protection line 114 and between the second internal protection line 113 and the second intermediate protection line 115. The second precision voltage driving module is designed to further isolate other interference during the test of the second sampling signal Vsense to ensure accurate measurement. In addition, most of the leakage current generated between the main signal transmission line 111 and the first internal protection layer 12 and the second internal protection line 113 will return to the load circuit 3 and be transmitted to the voltage measurement module 6 as part of the first sampling signal Vsense+ through the first internal protection line 112, the second internal protection line 113 and the second precision voltage driving module.

[0045] In some embodiments, both the first precision voltage driver module and the second precision voltage driver module are operational amplifiers. The operational amplifier has a high impedance property, which results in a very small current flowing into the input terminal of the operational amplifier. This, in turn, causes most of the leakage current generated between the main signal transmission line 111 and the first internal protection line 112, and between the main signal transmission line 111 and the second internal protection line 113, to flow into the load circuit 3, further reducing the leakage current generated by the transmission circuit. Furthermore, using the operational amplifier as the second precision voltage driver module can further isolate other interference when testing the second sampling signal Vsense, ensuring accurate measurement. Furthermore, most of the leakage current generated between the main signal transmission line 111 and the first internal protection layer 12 and the second internal protection line 113 will return to the load circuit 3 and be transmitted as part of the first sampling signal Vsense+ through the first internal protection line 112, the second internal protection line 113, and the operational amplifier serving as the second precision voltage driver module to the voltage measurement module 6.

[0046] In choosing Figure 4 In the transmission module 1 shown, the input end of the second driving isolation module 5 is electrically connected to the A end of the first internal protection line 112, the A end of the second internal protection line 113, the A end of the third internal protection line 121 and the A end of the fourth internal protection line 131.

[0047] Based on the above description, a PCB transmission layer including at least one core line (that is, the main signal transmission line 111), at least one first internal protection line 112, at least one second internal protection line 113, at least one first intermediate protection line 114, at least one second intermediate protection line 115, at least one first external protection line 116, and at least one second external protection line 117 is selected for example description. The first precision voltage driving module is used as the first driving isolation module 4, and the second precision voltage driving module is used as the second driving isolation module 5. Then, the following can be obtained: Figure 7 The transmission circuit diagram of the present disclosure shown in the figure has the following electrical connection relationship: the external source circuit 2 is electrically connected to the A end of the core wire, the B end of the core wire is electrically connected to the first end of the load circuit 3, the B end of the first internal protection wire 112 and the B end of the second internal protection wire 113 are electrically connected to the first end of the load circuit 3, the A end of the first internal protection wire 112 and the A end of the second internal protection wire 113 are electrically connected to the voltage measurement module 6, and are also electrically connected to the input end of the second precision voltage driving module, the output end of the second precision voltage driving module is electrically connected to the input end of the first precision voltage driving module, and the first precision voltage The output end of the driving module is electrically connected to the A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115. The A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115 are connected to each other. The A end of the first external protection line 116 and the A end of the second external protection line 117 are connected to the ground signal AGND, and the ground signal AGND is transmitted from their respective A ends to their respective B ends. The B end of the first external protection line 116 and the B end of the second external protection line 117 are connected together. The second end of the load circuit 3 is connected to the ground signal AGND.

[0048] The external source circuit 2 is used to emit a first main signal Force+, the voltage of the first main signal Force+ is V1, the A end of the core line receives the first main signal Force+ and transmits the first main signal Force+ from the A end of the core line to the B end of the core line, the first main signal Force+ becomes the second main signal F+, the second main signal F+ is transmitted from the B end of the core line to the first end of the load circuit 3, and the voltage signal of the first end of the load circuit 3 equal to the second main signal F+ is transmitted as the remote sampling signal S+ to the B end of the first internal protection line 112 and the B end of the second internal protection line 113. The voltage of the remote sampling signal S+ is equal to that of the second main signal F+, both of which are V0. The B end of the first internal protection line 112 and the B end of the second internal protection line 113 receive the remote sampling signal S+ and transmit the remote sampling signal S+ to their respective A ends, the remote sampling signal S+ becomes the first sampling signal Vsense+, and the first sampling signal The voltage of the signal Vsense+ is V3. The A end of the first internal protection line 112 and the A end of the second internal protection line 113 transmit the first sampling signal Vsense+ to the input end of the second precision voltage driving module. The second precision voltage driving module converts the first sampling signal Vsense+ into a second sampling signal Vsense, and outputs it from the output end of the second precision voltage driving module to the voltage measurement module 6, and also outputs it to the input end of the first precision voltage driving module. The voltage of the second sampling signal Vsense is V4. The first precision voltage driving module converts the received second sampling signal Vsense into a protection signal Guard, and outputs the protection signal Guard from the first precision voltage driving module to the A end of the first intermediate protection line 114 and the A end of the second intermediate protection line 115, and transmits the protection signal Guard from their respective A ends to their respective B ends. The voltage of the protection signal Guard is V2.

[0049] Therefore, according to Figure 7 and Figure 8 The following results are obtained by analyzing V0, V2, V3, and V4. The following calculations are based on Figure 4 The transmission module shown is connected to the PCB transmission line corresponding to the transmission module. The specific content is as follows: the voltage difference ΔV3 between the voltage V3 of the first sampling signal Vsense+ and the voltage V0 of the remote sampling signal S+ is caused by the leakage current ILeakage2 generated during the transmission of the first internal protection line 112 and the second internal protection line 113. However, this leakage current can be guaranteed to be very small due to circuit design, such as materials, so V3 and V0 are approximately equal, and are recorded as V3=V0. In addition, the relationship between the voltage V4 of the second sampling signal Vsense and the voltage V3 of the first sampling signal Vsense+ is:

[0050] V4= V3+ΔV1=V0+ΔV1

[0051] Wherein, ΔV1 is the output error of the second precision voltage driving module. Generally, the value range of ΔV1 is: -3uV≤ΔV0≤3uV. The relationship between the voltage V2 of the protection signal Guard and the voltage V4 of the second sampling signal Vsense can be:

[0052] V2 = V4 + ΔV0 = V0 + ΔV0 + ΔV1

[0053] Wherein, ΔV0 is the output error of the first precision voltage driving module, and generally the value range of ΔV0 is: -3uV≤ΔV1≤3uV.

[0054] The input current of the core wire in the PCB transmission line is Iin=Iout+ILeakage0, where Iout is the output current of the core wire in the PCB transmission line, ILeakage0 is the equivalent leakage current generated between the core wire in the PCB transmission line and the first internal protection line 112, the second internal protection line 113, the third internal protection line 121 and the fourth internal protection line 131. Part of it is used as the input current of the second precision voltage driving module, that is, ILeakage2, and the other part is used as the current between the first internal protection line 112 and the first intermediate protection line 114, between the second internal protection line 113 and the second intermediate protection line 115, between the third internal protection line 121 and the third intermediate protection line 122, and between the third internal protection line 131 and the third intermediate protection line 132. The equivalent leakage current generated between the line 121 and the fourth intermediate protection line 123, between the fourth internal protection line 131 and the fifth intermediate protection line 132, between the fourth internal protection line 131 and the sixth intermediate protection line 133, between the third internal protection line 121 and the seventh intermediate protection line 141, and between the fourth internal protection line 131 and the eighth intermediate protection line 151, that is, ILeakage1. The rest flows to the load circuit 3 and is not included in the leakage current. The leakage current generated by the PCB transmission line ILeakagePCB=ILeakage1, and the leakage current generated by the transmission circuit ILeakageSys=ILeakage1+ILeakage2.

[0055] The voltage difference between the end A of the first internal protection line 112 and the end A of the first intermediate protection line 114 of the PCB transmission line, or the voltage difference between the end A of the second internal protection line 113 and the end A of the second intermediate protection line 115, or the voltage difference between the end A of the third internal protection line 121 and the end A of the third intermediate protection line 122, or the voltage difference between the end A of the third internal protection line 121 and the end A of the fourth intermediate protection line 123, or the voltage difference between the end A of the fourth internal protection line 131 and the end A of the fifth intermediate protection line 132, or the voltage difference between the end A of the fourth internal protection line 131 and the end A of the sixth intermediate protection line 133, or the voltage difference between the end A of the third internal protection line 121 and the end A of the seventh intermediate protection line 141, or the voltage difference between the end A of the fourth internal protection line 131 and the end A of the eighth intermediate protection line 151 is V2-V3=ΔV0+ΔV1≤6uV ; The voltage difference between the B end of the first internal protection line 112 and the B end of the first intermediate protection line 114 of the PCB transmission line, or the voltage difference between the B end of the second internal protection line 113 and the B end of the second intermediate protection line 115, or the voltage difference between the B end of the third internal protection line 121 and the B end of the third intermediate protection line 122, or the voltage difference between the B end of the third internal protection line 121 and the B end of the fourth intermediate protection line 123, or the voltage difference between the B end of the fourth internal protection line 131 and the B end of the fifth intermediate protection line 132, or the voltage difference between the B end of the fourth internal protection line 131 and the B end of the sixth intermediate protection line 133, or the voltage difference between the B end of the third internal protection line 121 and the B end of the seventh intermediate protection line 141, or the voltage difference between the B end of the fourth internal protection line 131 and the B end of the eighth intermediate protection line 151 is V2-V3=V2-V0=ΔV0+ΔV1+voltage drop loss during signal transmission on the internal protection line≤6uV , here the voltage drop loss during signal transmission on the internal protection line is negligible, so

[0056] ΔVsg≤ MAX((V2-V3), (V2-V0 )) ≤ 6uV,

[0057] Therefore, ILeakagePCB = ILeakage0 = ΔVsg / Rsg ≤ 6uV / 5.34* Ω≤1.12* A ≤ 0.112fA, where ΔVsg is the voltage difference between the protection signal Guard and the first sampling signal Vsense+, and Rsg is the equivalent resistance of the resistance between the first internal protection line 112 and the first intermediate protection line 114, the resistance between the second internal protection line 113 and the second intermediate protection line 115, the resistance between the third internal protection line 121 and the third intermediate protection line 122, the resistance between the third internal protection line 121 and the fourth intermediate protection line 123, the resistance between the fourth internal protection line 131 and the fifth intermediate protection line 132, the resistance between the fourth internal protection line 131 and the sixth intermediate protection line 133, the resistance between the third internal protection line 121 and the seventh intermediate protection line 141, and the resistance between the fourth internal protection line 131 and the eighth intermediate protection line 151, for example, 5.34* Ω, much smaller than Figure 2 The leakage current of the prior art shown is at the pA level, so the leakage current generated in the PCB transmission line is greatly reduced compared with the prior art. When the transmission circuit is applied to the load current measurement of the load circuit 3, the measurement result will be more accurate.

[0058] While embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations of these embodiments are possible. However, it should be understood that such modifications and variations are within the scope and spirit of the invention as defined in the appended claims. Furthermore, the invention described herein is susceptible to other embodiments and may be practiced or implemented in a variety of ways.

Claims

1. A transmission module, characterized in that: Including the main signal transmission layer, The main signal transmission layer includes a main signal transmission line, a first inner protection line, a second inner protection line, a first middle protection line, a second middle protection line, a first outer protection line, and a second outer protection line extending in the same direction; The first outer protection line and the second outer protection line are respectively arranged on both sides of the main signal transmission line, the first middle protection line is arranged between the first outer protection line and the first inner protection line, the second middle protection line is arranged between the second outer protection line and the second inner protection line, the first inner protection line is arranged between the first middle protection line and the main signal transmission line, and the second inner protection line is arranged between the second middle protection line and the main signal transmission line; The main signal transmission line is used to transmit the first main signal to obtain the second main signal, and transmit the remote sampling signal with a voltage equal to that of the second main signal to the first internal protection line and the second internal protection line. The first internal protection line and the second internal protection line are respectively used to transmit the remote sampling signal and obtain the first sampling signal. The first intermediate protection line and the second intermediate protection line are respectively used to transmit a protection signal, and the voltage of the protection signal is equal to that of the first sampling signal. The first external protection line and the second external protection line are connected to the ground signal.

2. The transmission module according to claim 1, characterized in that The transmission module further includes a first internal protection layer and a second internal protection layer stacked with the main signal transmission layer, and the first internal protection layer and the second internal protection layer are respectively arranged on both sides of the main signal transmission layer; The first inner protection layer includes a third middle protection line, a third inner protection line, a fourth middle protection line, a third outer protection line, and a fourth outer protection line extending in the same direction. The third outer protection line and the fourth outer protection line are arranged on both sides of the third inner protection line, the third middle protection line is arranged between the third outer protection line and the third inner protection line, and the fourth middle protection line is arranged between the fourth outer protection line and the third inner protection line. In a direction perpendicular to the first inner protection layer, the orthographic projection of the third inner protection line covers the orthographic projection of the main signal transmission line, and the orthographic projection of the third inner protection line at least partially overlaps with the orthographic projection of the first inner protection line and the orthographic projection of the second inner protection line, respectively. The second inner protection layer includes a fifth middle protection line, a fourth inner protection line, a sixth middle protection line, a fifth outer protection line, and a sixth outer protection line extending in the same direction. The fifth outer protection line and the sixth outer protection line are arranged on both sides of the fourth inner protection line, the fifth middle protection line is arranged between the fifth outer protection line and the fourth inner protection line, and the sixth middle protection line is arranged between the sixth outer protection line and the fourth inner protection line. In a direction perpendicular to the second inner protection layer, an orthographic projection of the fourth inner protection line covers an orthographic projection of the main signal transmission line, and an orthographic projection of the fourth inner protection line at least partially overlaps with an orthographic projection of the first inner protection line and an orthographic projection of the second inner protection line, respectively. The third internal protection line and the fourth internal protection line are respectively used to transmit the remote sampling signal and obtain the first sampling signal, the third intermediate protection line, the fourth intermediate protection line, the fifth intermediate protection line, and the sixth intermediate protection line are respectively used to transmit the protection signal, and the third external protection line, the fourth external protection line, the fifth external protection line, and the sixth external protection line are all connected to the ground signal.

3. The transmission module according to claim 2, characterized in that The transmission module further includes a first intermediate protective layer stacked with the first inner protective layer and a second intermediate protective layer stacked with the second inner protective layer, the first inner protective layer being disposed between the main signal transmission layer and the first intermediate protective layer, and the second inner protective layer being disposed between the main signal transmission layer and the second intermediate protective layer; The first intermediate protective layer includes a seventh intermediate protective line, a seventh outer protective line, and an eighth outer protective line extending in the same direction. The seventh outer protective line and the eighth outer protective line are arranged on both sides of the seventh intermediate protective line. In a direction perpendicular to the first intermediate protective layer, the orthographic projection of the seventh intermediate protective line covers the orthographic projection of the third inner protective line, and the orthographic projection of the seventh intermediate protective line at least partially overlaps with the orthographic projections of the third intermediate protective line and the fourth intermediate protective line, respectively. The second intermediate protective layer includes an eighth intermediate protective line, a ninth outer protective line, and a tenth outer protective line extending in the same direction, the ninth outer protective line and the tenth outer protective line being arranged on either side of the eighth intermediate protective line, and in a direction perpendicular to the second intermediate protective layer, an orthographic projection of the eighth intermediate protective line overlaps an orthographic projection of the fourth inner protective line, and the orthographic projection of the eighth intermediate protective line at least partially overlaps with an orthographic projection of the fifth intermediate protective line and an orthographic projection of the sixth intermediate protective line, respectively; The seventh middle protection line and the eighth middle protection line are respectively used to transmit the protection signal, and the seventh outer protection line, the eighth outer protection line, the ninth outer protection line and the tenth outer protection line are all connected to the ground signal.

4. The transmission module according to claim 3, characterized in that The transmission module further includes a first outer protective layer stacked with the first intermediate protective layer and a second outer protective layer stacked with the second intermediate protective layer, the first intermediate protective layer being disposed between the first inner protective layer and the first outer protective layer, and the second intermediate protective layer being disposed between the second inner protective layer and the second outer protective layer; The first outer protection layer is an eleventh outer protection line. In a direction perpendicular to the first outer protection layer, an orthographic projection of the eleventh outer protection line covers an orthographic projection of the seventh intermediate protection line, and the orthographic projection of the eleventh outer protection line at least partially overlaps with an orthographic projection of the seventh outer protection line and an orthographic projection of the eighth outer protection line, respectively. The second outer protection layer is a twelfth outer protection line. In a direction perpendicular to the second outer protection layer, the orthographic projection of the twelfth outer protection line covers the orthographic projection of the eighth intermediate protection line, and the orthographic projection of the twelfth outer protection line at least partially overlaps with the orthographic projections of the ninth outer protection line and the tenth outer protection line, respectively. The eleventh external protection line and the twelfth external protection line are both connected to the ground signal.

5. A transmission circuit, characterized in that: Connecting an external source circuit and a load circuit, the transmission circuit includes the transmission module according to claim 1 and a first drive isolation module, The main signal transmission line is used to receive a first main signal emitted by the external source circuit and transmit the first main signal to the first end of the load circuit to obtain a second main signal, use a voltage signal at the first end of the load circuit that is equal to the voltage of the second main signal as a remote sampling signal, and transmit the remote sampling signal to the first internal protection line and the second internal protection line. The first internal protection line and the second internal protection line transmit the remote sampling signal to obtain the first sampling signal, and transmit the first sampling signal to the first drive isolation module. The first driving isolation module is used to receive the first sampling signal and convert the sampling signal into a protection signal. It is also used to isolate the current input from the input end of the first driving isolation module from the current output from the output end of the first driving isolation module. The protection signal is equal to the voltage of the second main signal.

6. The transmission circuit according to claim 5, characterized in that The external source circuit is electrically connected to the first end of the main signal transmission line, the second end of the main signal transmission line is electrically connected to the first end of the load circuit, the second end of the first internal protection line and the second end of the second internal protection line are respectively electrically connected to the first end of the load circuit, the first end of the first internal protection line and the first end of the second internal protection line are respectively electrically connected to the input end of the first drive isolation module, and the output end of the first drive isolation module is electrically connected to the first intermediate protection line and the second intermediate protection line.

7. The transmission circuit according to claim 6, wherein: The transmission module further includes a first internal protection layer and a second internal protection layer stacked with the main signal transmission layer, and the first internal protection layer and the second internal protection layer are respectively arranged on both sides of the main signal transmission layer; The first inner protection layer includes a third middle protection line, a third inner protection line, a fourth middle protection line, a third outer protection line, and a fourth outer protection line extending in the same direction. The third outer protection line and the fourth outer protection line are arranged on both sides of the third inner protection line, the third middle protection line is arranged between the third outer protection line and the third inner protection line, and the fourth middle protection line is arranged between the fourth outer protection line and the third inner protection line. In a direction perpendicular to the first inner protection layer, the orthographic projection of the third inner protection line covers the orthographic projection of the main signal transmission line, and the orthographic projection of the third inner protection line at least partially overlaps with the orthographic projection of the first inner protection line and the orthographic projection of the second inner protection line, respectively. The second inner protection layer includes a fifth middle protection line, a fourth inner protection line, a sixth middle protection line, a fifth outer protection line, and a sixth outer protection line extending in the same direction. The fifth outer protection line and the sixth outer protection line are arranged on both sides of the fourth inner protection line, the fifth middle protection line is arranged between the fifth outer protection line and the fourth inner protection line, and the sixth middle protection line is arranged between the sixth outer protection line and the fourth inner protection line. In a direction perpendicular to the second inner protection layer, an orthographic projection of the fourth inner protection line covers an orthographic projection of the main signal transmission line, and an orthographic projection of the fourth inner protection line at least partially overlaps with an orthographic projection of the first inner protection line and an orthographic projection of the second inner protection line, respectively. The second end of the third internal protection line and the second end of the fourth internal protection line are respectively electrically connected to the first end of the load circuit, the first end of the third internal protection line and the first end of the fourth internal protection line are respectively electrically connected to the input end of the first drive isolation module, and are both used to transmit the remote sampling signal and obtain the first sampling signal. The output end of the first drive isolation module is respectively electrically connected to the third intermediate protection line, the fourth intermediate protection line, the fifth intermediate protection line, and the sixth intermediate protection line, and are respectively used to transmit the protection signal. The third external protection line, the fourth external protection line, the fifth external protection line, and the sixth external protection line are all connected to the ground signal.

8. The transmission circuit according to claim 7, wherein: The transmission module further includes a first intermediate protective layer stacked with the first inner protective layer and a second intermediate protective layer stacked with the second inner protective layer, the first inner protective layer being disposed between the main signal transmission layer and the first intermediate protective layer, and the second inner protective layer being disposed between the main signal transmission layer and the second intermediate protective layer; The first intermediate protective layer includes a seventh intermediate protective line, a seventh outer protective line, and an eighth outer protective line extending in the same direction. The seventh outer protective line and the eighth outer protective line are arranged on both sides of the seventh intermediate protective line. In a direction perpendicular to the first intermediate protective layer, the orthographic projection of the seventh intermediate protective line covers the orthographic projection of the third inner protective line, and the orthographic projection of the seventh intermediate protective line at least partially overlaps with the orthographic projections of the third intermediate protective line and the fourth intermediate protective line, respectively. The second intermediate protective layer includes an eighth intermediate protective line, a ninth outer protective line, and a tenth outer protective line extending in the same direction, the ninth outer protective line and the tenth outer protective line being arranged on either side of the eighth intermediate protective line, and in a direction perpendicular to the second intermediate protective layer, an orthographic projection of the eighth intermediate protective line overlaps an orthographic projection of the fourth inner protective line, and the orthographic projection of the eighth intermediate protective line at least partially overlaps with an orthographic projection of the fifth intermediate protective line and an orthographic projection of the sixth intermediate protective line, respectively; The output ends of the first drive isolation module are electrically connected to the seventh intermediate protection line and the eighth intermediate protection line, and are respectively used to transmit the protection signal. The seventh external protection line, the eighth external protection line, the ninth external protection line and the tenth external protection line are all connected to the ground signal.

9. The transmission circuit according to claim 8, characterized in that The transmission module further includes a first outer protective layer stacked with the first intermediate protective layer and a second outer protective layer stacked with the second intermediate protective layer, the first intermediate protective layer being disposed between the first inner protective layer and the first outer protective layer, and the second intermediate protective layer being disposed between the second inner protective layer and the second outer protective layer; The first outer protection layer is an eleventh outer protection line. In a direction perpendicular to the first outer protection layer, an orthographic projection of the eleventh outer protection line covers an orthographic projection of the seventh intermediate protection line, and the orthographic projection of the eleventh outer protection line at least partially overlaps with an orthographic projection of the seventh outer protection line and an orthographic projection of the eighth outer protection line, respectively. The second outer protection layer is a twelfth outer protection line. In a direction perpendicular to the second outer protection layer, the orthographic projection of the twelfth outer protection line covers the orthographic projection of the eighth intermediate protection line, and the orthographic projection of the twelfth outer protection line at least partially overlaps with the orthographic projections of the ninth outer protection line and the tenth outer protection line, respectively. The eleventh external protection line and the twelfth external protection line are both connected to the ground signal.

10. The transmission circuit according to any one of claims 5 to 9, characterized in that: The transmission circuit is also used to connect to a voltage measurement module; The transmission circuit further includes a second driving isolation module, which is used to convert the received first sampling signal into a second sampling signal having a voltage equal to that of the first sampling signal, and output the second sampling signal to the input end of the first driving isolation module instead of the first sampling signal, and output the second sampling signal to the voltage measurement module, and is further used to isolate the current input from the input end of the second driving isolation module from the current output from the output end of the second driving isolation module. The first driving isolation module is used to convert the second sampling signal received from the second driving isolation module into the protection signal having a voltage equal to the second sampling signal output by the second driving isolation module. The voltage measurement module is used to measure the voltage of the second sampling signal.

11. The transmission circuit according to claim 10, characterized in that: The input end of the second driving isolation module is connected to the first end of the first internal protection line and the first end of the second internal protection line, the output end of the second driving isolation module is connected to the input end of the first driving isolation module, and the output end of the second driving isolation module is also connected to the voltage measurement module.

12. The transmission circuit according to claim 10, wherein: The first drive isolation module and the second drive isolation module are both precision voltage drive modules. The output end of the precision voltage drive module tracks the voltage of the signal received by the input end of the precision voltage drive module in real time, so that the voltage signal output by the precision voltage drive module and the voltage signal input are within the error range of the precision voltage drive module.

13. The transmission circuit according to claim 12, wherein: The precision voltage driving module is an operational amplifier.

Images