Power module with controllable current direction

Abstract

The utility model provides a power module with a controllable current direction. The power module is formed by packaging a partial or whole current direction conversion circuit. The current direction conversion circuit comprises an NTC resistor, a protection circuit, a first branch circuit and a second branch circuit, the NTC resistor is arranged in parallel with the first branch circuit and the second branch circuit, and the two ends of the NTC resistor, the first branch circuit and the second branch circuit are all connected with an external control module; the first branch circuit is connected with the second branch circuit, and the first branch circuit and the second branch circuit are both connected with the protection circuit; according to the power module with the controllable current direction, the arrangement of a circuit structure in the power module can be effectively simplified, the flexibility and the safety of the circuit for regulating and controlling the current direction are improved, the cost of the power module is reduced, and the space occupied by the circuit in the power module can be flexibly regulated according to requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy power system energy storage technical field, specifically, it relates to a current direction controllable power module. BACKGROUND

[0002] The core performance indexes such as efficiency, reliability and safety of battery energy storage system are crucial for safe operation and successful commercial deployment of the energy storage system. Digital energy storage system changes the physical hard connection mode between battery PACKs into flexible connection mode controlled by program through discretization and digitization of battery PACK module energy flow, thereby realizing the transformation from analog battery energy storage system to digital battery energy storage system. This transformation fundamentally solves the industry pain points of safety and economy caused by the short board effect of battery system, and realizes seamless connection with information internet. As a disruptive technology of energy internet, digital energy storage has far-reaching significance in the future development of the energy storage industry.

[0003] In the prior art patent CN107508293A, a control device and method for improving the frequency stability of a double-region interconnected power system are mentioned. The control device adopts a power smoother and IGBT in the current transformer to adjust the output power of the wind turbine, but the structure cannot control the direction of the current, and cannot meet the requirements of the connection equipment between the battery PACKs. Moreover, the structure is complex, and occupies a large space in the control device, which increases the cost of the device.

[0004] Therefore, in the digital energy storage system, it is important to study how to optimize the structure of the connection equipment between the battery PACKs to control the direction of the current, the circuit switch and ensure the safe operation of the battery PACK and the system. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a current direction controllable power module to solve the problems that the power smoother and the current transformer cannot flexibly control the direction of the current, and the overall circuit structure occupies a large space in the control device, and the device structure is complex and the cost is high. The utility model simplifies the circuit structure in the power module, improves the flexibility and safety of the circuit in controlling the direction of the current, reduces the cost of the power module, and adjusts the size of the space occupied by the circuit in the power module flexibly according to the requirements.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] The utility model relates to a kind of power module of current direction controllable, a kind of power module of current direction controllable, the power module is formed by the current direction conversion circuit package of part or whole;Current direction conversion circuit includes NTC resistance, protection circuit, first branch and second branch, NTC resistance is respectively arranged with first branch, second branch, and the both ends of NTC resistance, first branch, second branch are connected with external control module;First branch is connected with second branch, and first branch, second branch are connected with protection circuit.

[0008] Further, NTC resistance is provided at least one.

[0009] Further, NTC resistance is provided two, and the both ends of two NTC resistances are respectively connected with external control module.

[0010] Further, protection circuit includes battery monitoring one pin J1, battery monitoring two pins J2, battery monitoring three pins J3 and TVS device;Battery monitoring one pin J1 is connected with battery monitoring two pins J2, battery monitoring three pins J3 respectively by TVS device, and the both ends of first branch are respectively connected with battery monitoring one pin J1, battery monitoring two pins J2, and the both ends of second branch are respectively connected with battery monitoring one pin J1, battery monitoring three pins J3.

[0011] Further, TVS device is provided at least two.

[0012] Further, first branch and second branch include at least two switch groups.

[0013] Further, each described switch group includes n power semiconductor switches, n is positive integer, and n≥1;When n>1, n power semiconductor switches in each switch group are connected in parallel.

[0014] Further, first branch contains two switch groups, and first branch includes first switch group, second switch group, branch one pin G11, branch two pin S1 and branch three pin G12;Drain of first switch group is connected with battery monitoring one pin J1, gate of first switch group is connected with branch one pin G11, source of first switch group is connected with branch two pin S1 and source of second switch group respectively, gate of second switch group is connected with branch three pin G12, and drain of second switch group is connected with battery monitoring two pins J2.

[0015] Further, in first branch or second branch, TVS device is provided at least three;TVS device is transient voltage suppression diode.

[0016] Further, the first branch is provided with three TVS devices, and the three TVS devices are respectively TVS one D1, TVS two D2 and TVS three D3; the TVS one D1 and the TVS two D2 are provided in parallel with the first switch group and the second switch group; one end of the TVS one D1 is connected with the battery monitoring one pin J1 and one end of the TVS three D3, the other end of the TVS one D1 is connected with the branch two pin S1 and one end of the TVS two D2, and the other end of the TVS two D2 is connected with the other end of the TVS three D3 and the battery monitoring two pin J2.

[0017] Compared with the prior art, the power module with controllable current direction has the following beneficial effects:

[0018] Through the setting of the power module, the setting of the circuit structure in the power module can be effectively simplified, the flexibility and safety of the circuit in regulating the current direction are improved, the cost of the power module is reduced, and the size of the space occupied by the circuit in the power module can be flexibly adjusted according to the requirement. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein for explanation by reference. The present embodiments and their alternatives will be best understood from the following detailed description taken in conjunction with the accompanying drawings, of which:

[0020] Figure 1 It is a schematic diagram of the overall circuit structure in the power module;

[0021] Figure 2 It is a schematic diagram of the current flow direction when the large current flows through the TVS device in different switch groups, taking the first switch group as an example;

[0022] Figure 3 It is a schematic diagram of the current flow direction when the large current flows through the TVS device in different branches, taking the first branch as an example;

[0023] Figure 4 It is a schematic diagram of the first current flow mode in the first branch;

[0024] Figure 5 It is a schematic diagram of the second current flow mode in the first branch;

[0025] Figure 6 It is a schematic diagram of the third current flow mode in the first branch;

[0026] Figure 7 It is a schematic diagram of the first current flow mode in the second branch;

[0027] Figure 8 It is a schematic diagram of the second current flow mode in the second branch;

[0028] Figure 9 The third current flow mode is shown in the schematic diagram of the second branch.

[0029] Legend: 1, first switch group; 2, second switch group; 3, third switch group; 4, fourth switch group. DETAILED DESCRIPTION

[0030] The utility novel concepts of the present disclosure will be described below using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. However, these utility novel concepts can be embodied in many different forms, and thus should not be considered limited to the embodiments described herein.

[0031] It should be noted that the embodiments in the present utility novel and the features in the embodiments can be combined with each other without conflict.

[0032] The present utility novel will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] The present embodiment is aimed at the new energy power system, which is the same as the conventional new energy power system, and the overall structure is composed of wires, batteries and switches.

[0034] In order to solve the problem that the power smoother and the current transformer in the prior art cannot realize flexible control of the current direction, and the overall circuit structure occupies a large space in the control device, and the device structure is complex and the cost is high, the present embodiment provides a power module with controllable current direction, which is formed by packaging part or whole of the current direction conversion circuit. The current direction conversion circuit includes an NTC resistor, a protection circuit, a first branch and a second branch, the NTC resistor is arranged in parallel with the first branch and the second branch respectively, and the two ends of the NTC resistor, the first branch and the second branch are connected with an external control module; the first branch is connected with the second branch, and the first branch and the second branch are connected with the protection circuit.

[0035] Through the arrangement of the two branches in the power module, the arrangement of the circuit structure in the power module can be effectively simplified, the flexibility and safety of the circuit in controlling the current direction are improved, the cost of the power module is reduced, and the size of the space occupied by the circuit in the power module can be flexibly adjusted according to the needs. In addition, the power module is connected with the battery, which can be used to control the charging and discharging of the battery. In addition, the power module is equivalent to two built-in switch devices that can control the current direction, which can be used to control the use of the battery, and can also be connected in series in the required circuit to replace the switch.

[0036] The NTC resistor is arranged at least one. The two NTC resistors are arranged two, and two ends of the two NTC resistors are connected with the control module in the external converter of the driving power module respectively, for detecting the temperature change of each branch in the power module, and timely transmitting information to the external control module. The two NTC resistors are arranged at positions corresponding to the first branch and the second branch respectively, the distance between the first branch and the corresponding NTC resistor is L, the distance between the second branch and the corresponding NTC resistor is L, L is a positive number, and the value range of L is determined according to the required measurement accuracy, environmental conditions, and the type and application scene of the NTC resistor. Preferably, L<200mm. Specifically, the circuit composed of the NTC resistor, the protection circuit, the first branch and the second branch is packaged into a power module, or part of the circuit composed of the NTC resistor, the protection circuit, the first branch and the second branch is packaged into a power module. In the embodiment, the two NTC resistors are a first NTC resistor and a second NTC resistor, the first NTC resistor and the second NTC resistor are arranged in parallel with the first branch and the second branch, the distance between the first NTC resistor and the first branch is equal to the distance between the second NTC resistor and the second branch. The shapes of the two pins NTC1 and NTC-C1 of the first NTC resistor and the two pins NTC2 and NTC-C2 of the second NTC resistor are needle-shaped, and the two pins NTC1 and NTC-C1 of the first NTC resistor and the two pins NTC2 and NTC-C2 of the second NTC resistor are connected with the external control module.

[0037] The power module is packaged with one or two NTC resistors, and the external control module reads the resistance value of the NTC resistor through the pins at both ends of the NTC resistor, so as to indirectly monitor the temperature inside the power module. Specifically, the current temperature inside the power module is calculated according to the relationship between the resistance value of the NTC resistor and the temperature, so as to facilitate real-time monitoring of the temperature inside the power module. In addition, through the arrangement of the two NTC resistors, the internal circuit of the power module has two temperature sampling points, which can improve the real-time monitoring of the temperature inside the power module by the external control module, and avoid damage to the internal circuit of the power module due to high internal temperature. In addition, the two temperature sampling points monitor the internal temperature of the power module at all times, and the internal temperature is determined by the current flowing through the power module and the heat dissipation measures of the power module. Without additional heat dissipation measures, the greater the current, the higher the temperature; in the case of a certain current, the better the heat dissipation measures, the lower the internal temperature of the module. Therefore, through the arrangement of the NTC resistor in the circuit, the safety of the internal circuit of the power module can be greatly improved.

[0038] The protection circuit comprises a battery monitoring pin J1, a battery monitoring pin J2, a battery monitoring pin J3 and a TVS device. The battery monitoring pin J1 is connected with the battery monitoring pin J2 and the battery monitoring pin J3 through the TVS device, the two ends of the first branch are connected with the battery monitoring pin J1 and the battery monitoring pin J2 respectively, and the two ends of the second branch are connected with the battery monitoring pin J1 and the battery monitoring pin J3 respectively. Among them, at least two TVS devices are arranged. Usually, two TVS devices are arranged, one TVS device is arranged between the battery monitoring pin J1 and the battery monitoring pin J2, and the other TVS device is arranged between the battery monitoring pin J1 and the battery monitoring pin J3. And it should be noted that the working voltage of the circuit cannot exceed the clamping voltage of the TVS, and when the working voltage exceeds the clamping voltage of the TVS device, the TVS starts to work. In addition, the battery monitoring pin J1, the battery monitoring pin J2 and the battery monitoring pin J3 are the lead-out points of the power module after packaging, that is, the pins. The current flows into or out of the power module through the pins.

[0039] Through the cooperation of the pins J1, J2 and J3 in the protection circuit and the TVS device, when a large current suddenly appears in the circuit, the current flow direction in the TVS device can be upward along the direction from S1 to J1 or downward along the direction from J1 to S1. This is conducive to improving the protection of the circuit during operation, avoiding damage to the circuit by transient high voltage and surge current, and enhancing the safety of the circuit.

[0040] The first branch and the second branch each comprise at least two switch groups. Each switch group comprises n power semiconductor switches, n is a positive integer, and n≥1. When n>1, the n power semiconductor switches in each switch group are connected in parallel. A body diode is arranged in each of the n power semiconductor switches; for protecting the power semiconductor switch. As shown in Figure 1 Q1-Q12 are all power semiconductor switches.

[0041] After packaging part or all of the power semiconductor, the volume of the device can be effectively reduced. It can also protect the device from environmental factors such as moisture, dust, chemicals and extreme temperatures, prevent corrosion, short circuit and performance degradation. It can also enhance the electrical insulation between circuits, prevent short circuit and accidental interaction between devices, ensure the integrity of the electrical path, and enable the device to operate safely. In addition, it can also reduce the impact of external pressure and potential failure on the power semiconductor switch, significantly improve the reliability of the overall circuit, and prolong the service life of the power semiconductor switch.

[0042] When the first branch includes two switch groups, the first branch includes a first switch group 1, a second switch group 2, a branch one pin G11, a branch two pin S1 and a branch three pin G12. The drain of the first switch group 1 is connected to the battery monitoring one pin J1 through a wire, the gate of the first switch group 1 is connected to the branch one pin G11 through a wire, the source of the first switch group 1 is connected to the branch two pin S1 and the source of the second switch group 2 through wires respectively, the gate of the second switch group 2 is connected to the branch three pin G12 through a wire, and the drain of the second switch group 2 is connected to the battery monitoring two pin J2 through a wire.

[0043] When the second branch includes two switch groups, the second branch includes a third switch group 3, a fourth switch group 4, a branch four pin G21, a branch five pin S2 and a branch six pin G22. The drain of the third switch group 3 is connected to the battery monitoring one pin J1 through a wire, the gate of the third switch group 3 is connected to the branch four pin G21 through a wire, the source of the third switch group 3 is connected to the branch five pin S2 and the source of the fourth switch group 4 through wires respectively, the gate of the fourth switch group 4 is connected to the branch six pin G22 through a wire, and the drain of the fourth switch group 4 is connected to the battery monitoring three pin J3 through a wire. Among them, each switch group can increase or decrease the number of parallel power semiconductor switches according to the power size required by the use scene.

[0044] Each branch can effectively reduce the space size occupied by the circuit in the power module through the flexible setting of the upper and lower two switch groups. Combined with the flexible setting of the number of power semiconductor switches in the switch group, the flexible adjustment of the space size occupied by the circuit in the power module can also be realized.

[0045] In the first branch or the second branch, at least three TVS devices are provided; the TVS device is a transient voltage suppression diode.

[0046] Specifically, three TVS devices are provided in the first branch, and the three TVS devices are TVS one D1, TVS two D2 and TVS three D3. The TVS one D1 and the TVS two D2 are arranged in parallel with the first switch group 1 and the second switch group 2 respectively. One end of the TVS one D1 is connected to the battery monitoring one pin J1 and one end of the TVS three D3 respectively, the other end of the TVS one D1 is connected to the branch two pin S1 and one end of the TVS two D2 respectively, the other end of the TVS two D2 is connected to the other end of the TVS three D3 and the battery monitoring two pin J2 respectively. Among them, the TVS one D1 and the TVS two D2 are used to protect the first switch group 1 and the second switch group 2 respectively, and the TVS three D3 is used to protect the first branch.

[0047] The second branch is provided with three TVS devices, and the three TVS devices are TVS four-tube D4, TVS five-tube D5 and TVS six-tube D6. The TVS four-tube D4 and the TVS five-tube D5 are arranged in parallel with the third switch group 3 and the fourth switch group 4 respectively. One end of the TVS four-tube D4 is connected with the battery monitoring one pin J1 and one end of the TVS six-tube D6 respectively, and the other end of the TVS four-tube D4 is connected with the branch five pin S2 and one end of the TVS five-tube D5 respectively. The other end of the TVS five-tube D5 is connected with the other end of the TVS six-tube D6 and the battery monitoring three pin J3 respectively. The TVS four-tube D4 and the TVS five-tube D5 are used for protecting the third switch group 3 and the fourth switch group 4 respectively, and the TVS six-tube D6 is used for protecting the second branch.

[0048] One TVS device is arranged in parallel with each switch group, that is, as shown in FIG. 1, the transient voltage suppression diodes D1, D2, D4 and D5 protect the switch groups. Since the TVS device is a protection element specially used for suppressing transient voltage, when overvoltage occurs in the circuit, the TVS device can quickly conduct and absorb the overvoltage energy to prevent the overvoltage from being conducted to the protected equipment, thereby protecting the safe operation of the electronic equipment. Therefore, when the voltage between J1 and S1 exceeds the working voltage of the switch group, D1 will quickly conduct to absorb the overvoltage energy, thereby protecting the switch group from being damaged. In addition, one TVS device is arranged in parallel with each branch for protection, that is, as shown in FIG. 1, the transient voltage suppression diodes D3 and D6; when the voltage between J1 and J2 exceeds the working voltage of the switch group, D3 will quickly conduct to absorb the overvoltage energy, thereby protecting the two switch groups in the branch 1 from being damaged. With the cooperation of different TVS devices, the safety and reliability of the circuit can be greatly improved, and the stable operation of the circuit is ensured. Figure 1 Figure 1

[0049] Working principle: The switch groups in the power module can be controlled respectively. The control mode is to apply DC 15V voltage on the gate pin and the source pin of different switch groups through an external control module. The external control module controls the opening and closing of different switch groups, thereby realizing the control of the current flowing direction of different branches in the power module. Specifically, the external control module can control the opening and closing of different switch groups in the first branch and the second branch to select the exchange of the current path, that is, the current can flow through the first branch, the current can flow through the second branch, and the current can flow through the first branch and the second branch at the same time. Specifically, as shown in examples 1-7, MOS tubes are selected as power semiconductor switches in examples 1-7.

[0050] Example 1: When DC 15V voltage is applied between G11 and S1, the first switch group 1 is opened; the second switch group 2, the third switch group 3 and the fourth switch group 4 are closed. ​​

[0051] Specifically, such as Figure 4 As shown, current flows from J1 through the parallel MOSFET in the first switch group 1 to S1. The second switch group 2 is in the off state, and current can only flow unidirectionally to J2 through the body diode in the second switch group 2. The final direction of the current flow is J1→S1→J2. In this embodiment, the body diode refers to the diode included in Q4, Q5, and Q6.

[0052] Example 2: When a DC 15V voltage is applied between G12 and S1, the second switch group 2 is turned on; the first switch group 1, the third switch group 3, and the fourth switch group 4 are turned off to stop the current flow.

[0053] Specifically, such as Figure 5 As shown, current flows from J2 through the parallel MOSFET in the second switch group 2 to S1. The first switch group 1 is in the off state, and current can only flow unidirectionally to J1 through the body diode within the first switch group 1. The final current flow direction is J2→S1→J1. In this embodiment, the body diode refers to the diode included in Q1, Q2, and Q3.

[0054] Example 3: When a DC 15V voltage is applied between G21 and S2, the third switch group 3 is turned on; the first switch group 1, the second switch group 2, and the fourth switch group 4 are turned off to stop the current flow.

[0055] Specifically, such as Figure 7 As shown, when a DC 15V voltage is applied between G21 and S2, the third switch group 3 is turned on, and current flows from J1 through the parallel MOSFET in the third switch group 3 to S2. The fourth switch group 4 is in the off state, and current can only flow unidirectionally to J3 through the body diode in the fourth switch group 4. The final current flow direction is J1→S2→J3. In this embodiment, the body diode refers to the diode included in Q10, Q11, and Q12.

[0056] Example 4: When a DC 15V voltage is applied between G22 and S2, the fourth switch group 4 is turned on; the first switch group 1, the second switch group 2, and the third switch group 3 are turned off to stop the current flow.

[0057] Specifically, such as Figure 8 As shown, current flows from J3 through the parallel MOSFET in the fourth switch group 4 to S2. The third switch group 3 is in the off state, and current can only flow unidirectionally to J1 through the body diode in the third switch group 3. The final current flow direction is J3→S2→J1. In this embodiment, the body diode refers to the body diode included in Q7, Q8, and Q9.

[0058] Example 5: When a DC 15V voltage is applied simultaneously between G11 and S, and between G12 and S1, the first switch group 1 and the second switch group 2 will be turned on simultaneously; the third switch group 3 and the fourth switch group 4 will be turned off to stop the current flow.

[0059] Specifically, as shown in Figure 6 The current can flow bidirectionally through the parallel MOS tubes in the first switch group 1 and the second switch group 2.

[0060] Example 6: When DC 15V voltage is applied between G21 and S2 and between G22 and S2 simultaneously, the third switch group 3 and the fourth switch group 4 are opened simultaneously; the first switch group 1 and the second switch group 2 are closed to the current flow direction.

[0061] Specifically, as shown in Figure 9 When DC 15V voltage is applied between G21 and S2 and between G22 and S2, the third switch group 3 and the fourth switch group 4 are opened, and the current can flow bidirectionally through the parallel MOS tubes in the third switch group 3 and the fourth switch group 4.

[0062] Example 7: When DC 15V voltage is applied between G11 and S1, between G12 and S1, between G21 and S2 and between G22 and S2 simultaneously, the first switch group 1, the second switch group 2, the third switch group 3 and the fourth switch group 4 are opened simultaneously.

[0063] In the utility model, for any new energy power system, can include the power module structure that the current direction of the present embodiment is controllable, and on the basis that the related structure and the assembly relation of TVS device, NTC resistance provided in the present embodiment, the new energy power system still includes the conventional component of wire, battery, switch and the like structure, in view of its all are prior art, do not make superfluous repetition here.

[0064] The above only is the preferred embodiment of the utility model, and does not use to limit the utility model, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A power module with controllable current direction, characterized in that The power module is formed by a partial or whole current direction conversion circuit package; the current direction conversion circuit includes an NTC resistor, a protection circuit, a first branch and a second branch, the NTC resistor is arranged in parallel with the first branch and the second branch respectively, and the two ends of the NTC resistor, the first branch and the second branch are connected with an external control module; the first branch is connected with the second branch, and the first branch and the second branch are connected with the protection circuit.

2. A power module with controllable current direction according to claim 1, characterized in that The NTC resistor is provided with at least one.

3. A power module with controllable current direction according to claim 1, characterized in that The NTC resistor is provided with two, and the two ends of the two NTC resistors are respectively connected with the external control module.

4. The power module of claim 1, wherein, The protection circuit includes a battery monitoring one pin J1, a battery monitoring two pin J2, a battery monitoring three pin J3 and a TVS device; the battery monitoring one pin J1 is connected with the battery monitoring two pin J2 and the battery monitoring three pin J3 through the TVS device, the two ends of the first branch are respectively connected with the battery monitoring one pin J1 and the battery monitoring two pin J2, and the two ends of the second branch are respectively connected with the battery monitoring one pin J1 and the battery monitoring three pin J3.

5. A power module with controllable current direction according to claim 4, characterized in that The TVS device is provided with at least two.

6. A power module with controllable current direction according to claim 1, characterized in that The first branch and the second branch each include at least two switch groups.

7. A power module with controllable current direction according to claim 6, characterized in that Each switch group includes n power semiconductor switches, n is a positive integer, and n≥1; when n>1, the n power semiconductor switches in each switch group are connected in parallel.

8. A power module with controllable current direction according to claim 6, characterized in that The first branch includes two switch groups, and the first branch includes a first switch group (1), a second switch group (2), a branch one pin G11, a branch two pin S1 and a branch three pin G12; the drain of the first switch group (1) is connected with the battery monitoring one pin J1, the gate of the first switch group (1) is connected with the branch one pin G11, the source of the first switch group (1) is connected with the branch two pin S1 and the source of the second switch group (2), the gate of the second switch group (2) is connected with the branch three pin G12, and the drain of the second switch group (2) is connected with the battery monitoring two pin J2.

9. A power module with controllable current direction according to claim 5, characterized in that In the first branch or the second branch, at least three TVS devices are provided; the TVS device is a transient voltage suppression diode.

10. A power module with controllable current direction according to claim 9, characterized in that The first branch is provided with three TVS devices, and the three TVS devices are a TVS one D1, a TVS two D2 and a TVS three D3; the TVS one D1 and the TVS two D2 are arranged in parallel with the first switch group (1) and the second switch group (2) respectively; one end of the TVS one D1 is connected with the battery monitoring one pin J1 and one end of the TVS three D3, the other end of the TVS one D1 is connected with the branch two pin S1 and one end of the TVS two D2, the other end of the TVS two D2 is connected with the other end of the TVS three D3 and the battery monitoring two pin J2.

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