Circuit breaker, driving system and control method thereof

Abstract

The invention discloses a circuit breaker, a driving system and a control method of the driving system. The circuit breaker comprises a shell; at least one part of the circuit breaking piece is arranged in the shell; and a sensing chip, wherein the sensing chip is integrated on the shell. According to the circuit breaker, the occupied volume is small, and the space utilization rate of the whole vehicle can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of driving devices, and in particular, to a circuit breaker, a driving system, and a control method thereof. Background Art

[0002] A circuit breaker is an electrical component that plays an electrical protection role in a circuit.

[0003] In related technologies, the circuit breaker receives the fusing signal of an external sensor by means of an externally connected sensor (for example, a Hall sensor is separately fixed on a three-phase copper bar). However, the Hall sensor separately fixed on the three-phase copper bar itself has a relatively large hardware volume, which will occupy a certain space in the whole vehicle, and is not conducive to the integration and functionality of the vehicle assembly. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a circuit breaker with a small occupied volume, which can improve the space utilization rate of the whole vehicle.

[0005] Another object of the present invention is to provide a driving system using the above circuit breaker.

[0006] Still another object of the present invention is to provide a control method for a driving system.

[0007] The circuit breaker according to the first aspect embodiment of the present invention includes: a housing, a breaking member, and an induction chip, at least a part of the breaking member is disposed in the housing; the induction chip is integrated in the housing.

[0008] For the circuit breaker according to the embodiment of the present invention, the induction chip is integrated in the housing. Compared with a conventional sensor (such as a Hall sensor) that is separately disposed, the induction chip has the functions of a conventional sensor and a small hardware volume itself. Integrating it on the existing housing of the circuit breaker is more conducive to the integration of the circuit breaker and improves the space utilization rate of the whole vehicle.

[0009] According to some embodiments of the present invention, the circuit breaker further includes: a circuit board, the circuit board is disposed in the housing, the induction chip is integrated on the circuit board, and the induction chip detects the working signal of the breaking member.

[0010] According to some embodiments of the present invention, one side of the circuit board facing the breaking member has a shielding member.

[0011] According to some embodiments of the present invention, the circuit breaker further includes at least one arc extinguishing member, and the arc extinguishing member is located between the breaking member and the shielding member.

[0012] According to some embodiments of the present invention, the arc extinguishing member is disposed on the shielding member.

[0013] According to some embodiments of the present invention, there are a plurality of arc extinguishing members, and the plurality of arc extinguishing members are arranged along the length direction of the circuit breaking member.

[0014] According to some embodiments of the present invention, a first ground wire is provided on the shielding member.

[0015] According to some embodiments of the present invention, one end of the first ground wire passes through the housing and extends to the outside of the housing.

[0016] According to some embodiments of the present invention, the circuit breaking member includes: a connection section, at least part of the connection section passes through the housing and extends to the outside of the housing; an overcurrent section, the overcurrent section is connected to the connection section, and a cutting groove is formed on the overcurrent section.

[0017] According to some embodiments of the present invention, the connection section includes: a first connection section, one end of the first connection section passes through the side wall of the housing and extends to the outside of the housing, and the other end of the first connection section is connected to one end of the overcurrent section; a second connection section, one end of the second connection section passes through the other side wall of the housing and extends to the outside of the housing, and the other end of the second connection section is connected to the other end of the overcurrent section.

[0018] According to some embodiments of the present invention, in the direction from the other end of the first connection section towards the other end of the second connection section, the overcurrent section first bends and extends towards the side where the circuit board is located, and then bends and extends away from the side where the circuit board is located.

[0019] According to some embodiments of the present invention, the circuit breaker further includes: a signal member, the signal member is provided on the housing, and the signal member is adapted to communicate with the control board.

[0020] According to some embodiments of the present invention, there are two signal members, the two signal members are respectively a positive signal wire and a negative signal wire, and the two signal members are adapted to receive the voltage signal of the control board to trigger the cutting off of the circuit breaking member.

[0021] According to some embodiments of the present invention, the circuit breaker further includes: a combustion chamber, the combustion chamber is provided in the housing, and the combustion chamber contains fuel. When the voltage on the signal member is greater than or equal to a preset voltage, the fuel is ignited to trigger the cutting off of the circuit breaking member; an inference device, the inference device is provided between the combustion chamber and the circuit breaking member, and the fuel burns to push the inference device towards the circuit breaking member so as to be movable to cut off the circuit breaking member.

[0022] According to some embodiments of the present invention, the fuel includes: a first fuel that burns to generate a force acting on the inference device to push the inference device towards the circuit breaker to cut off the circuit breaker.

[0023] According to some embodiments of the present invention, the fuel further includes: a second fuel that burns to generate a gas to transfer the arc generated by the disconnection of the circuit breaker to the arc extinguishing component.

[0024] According to some embodiments of the present invention, the induction chip includes a Hall sensor chip.

[0025] According to some embodiments of the present invention, a plurality of wires are provided on the circuit board, and at least the second ground wire, the power supply wire, and the communication wire are included in the plurality of wires.

[0026] According to some embodiments of the present invention, one ends of the plurality of wires respectively pass through the housing and extend to the outside of the housing.

[0027] The drive system according to the second aspect embodiment of the present invention includes: an electronic control unit, the electronic control unit includes an inverter; a motor; a circuit breaker, the circuit breaker is the circuit breaker described in the above first aspect embodiment, and the circuit breaker is connected between the inverter and the motor.

[0028] According to some embodiments of the present invention, the inverter includes three parallel bridge arms; the motor has three power input channels, and the three power input channels are respectively connected to the midpoints of the three bridge arms, and at least two of the three power input channels are provided with the circuit breaker between them and the corresponding bridge arms.

[0029] According to some embodiments of the present invention, the electronic control unit further includes: a control board that controls the circuit breaker to disconnect.

[0030] According to some embodiments of the present invention, the electronic control unit further includes: a drive board that drives the inverter to work, and the drive chip of the drive board detects IPM faults.

[0031] According to some embodiments of the present invention, the control board includes a controller chip and a signal processing chip, the controller chip communicates with the signal processing chip, the drive chip, and the circuit breaker induction chip respectively, and the signal processing chip communicates with the signal component of the circuit breaker.

[0032] The control method of the drive system according to the third aspect embodiment of the present invention includes the following steps: Obtain the status information of the electronic control unit; If no IPM fault is reported, continue to detect the status information of the electronic control unit; if an IPM fault is reported, obtain the status information of the motor. If no second fault is reported, re-obtain the status information of the electronic control unit; if a second fault is reported, control the circuit breaker to open.

[0033] According to some embodiments of the present invention, the second fault includes that the current in the power input channel of the motor exceeds a preset current threshold, whether the rotation speed of the motor exceeds a preset rotation speed threshold, the temperature in the power input channel of the motor exceeds a preset temperature threshold, or the back electromotive force of the motor is abnormal.

[0034] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a schematic diagram of a circuit breaker according to an embodiment of the present invention; Figure 2 is an exploded view of a circuit breaker according to an embodiment of the present invention; Figure 3 is a schematic diagram of a shielding part and a circuit board of a circuit breaker according to an embodiment of the present invention; Figure 4 is an assembly diagram of a breaking part, an arc extinguishing part, a combustion chamber and an inference device of a circuit breaker according to an embodiment of the present invention; Figure 5 is a schematic diagram of a circuit breaker according to another embodiment of the present invention; Figure 6 is a topological circuit structure diagram of a drive system according to an embodiment of the present invention; Figure 7 is a control strategy flowchart of a drive system according to an embodiment of the present invention.

[0036] REFERENCE SIGNS: 100, circuit breaker; 200, drive system; 201, battery pack; 1, housing; 11, first housing; 12, second housing; 2, breaking part; 20, connecting section; 21, first connecting section; 22, second connecting section; 23, overcurrent section; 231, cutting groove; 3, circuit board; 31, induction chip; 32, wire; 4, arc extinguishing part; 5, shielding part; 51, first ground wire; 6. Signal component; 7. Combustion chamber; 71. Fuel; 711. First fuel; 712. Second fuel; 8. Deduction device; 81. Deduction structure; 9. Electronic control unit; 91. Control board; 92. Inverter; 921. Bridge arm; 10. Motor. Detailed implementation manners

[0037] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Below, reference is made to Figures 1 - 5 Describe the circuit breaker 100 according to the embodiments of the present invention.

[0038] The circuit breaker 100 according to the embodiment of the first aspect of the present invention includes a housing 1, a breaking component 2, and an induction chip 31.

[0039] Combined with Figure 1 , Figure 2 and Figure 5 , at least a part of the breaking component 2 is arranged inside the housing 1. The above "at least a part" means that at least a part of the area in the breaking component 2 is covered by the housing 1 inside it. Thus, when the breaking component 2 is in the working state, the housing 1 can play a good protective role for the breaking component 2 and prevent the metal sheets inside the circuit breaker 100 from splashing outwards. When the circuit breaker 100 is used in the drive system 200 of a vehicle, both ends of the breaking component 2 are respectively adapted to be connected to the motor 10 and the inverter 92. For example, combined with Figure 1 , the area on the right side of the breaking component 2 outside the housing 1 is connected to the inverter 92, and the area on the left side of the breaking component 2 outside the housing 1 is connected to the motor 10. Thus, the motor 10 and the inverter 92 are connected via both ends of the breaking component 2. When working conditions such as under-voltage of the drive chip, short circuit, over-current, or over-temperature of the motor 10 occur, the circuit breaker 100 can cut off the circuit in time to protect the circuit safety of the drive system 200.

[0040] Combined with Figure 2 , the induction chip 31 is integrated into the housing 1. For example, the induction chip 31 can be integrated in the internal space of the housing 1. Of course, it can also be integrated at other positions of the housing. For example, integrating the induction chip 31 can be understood as integrating a large number of components such as transistors, resistors, capacitors, etc. and multiple functional circuits on a tiny chip, reducing the number of components on the circuit breaker 100 and also greatly reducing the space occupied by the induction chip 31, thereby further improving the integration inside the circuit breaker 100 and being beneficial to the production, processing, installation, and use of the circuit breaker 100.

[0041] According to the circuit breaker 100 of an embodiment of the present invention, the motor 10 and the inverter 92 are connected via a circuit breaker component 2. When operating conditions such as under-voltage of the drive chip, short circuit of the motor 10, over-current, or over-temperature occur, the circuit breaker 100 can cut off the circuit in time to protect the circuit safety of the drive system 200. An induction chip 31 is integrated on the housing 1. Compared with traditional sensors (such as Hall sensors, etc.) that are independently arranged, the induction chip 31 (such as a Hall sensor chip) has the functions of traditional sensors (such as Hall sensors) and its own hardware volume is small. Integrating it on the existing housing 1 of the circuit breaker 100 is more conducive to the integration of the circuit breaker 100 and improves the space utilization rate of the whole vehicle.

[0042] Optionally, the induction chip 31 can be fixed to the housing 1 by welding. Welding can form a metal connection between the pins of the induction chip 31 and the housing 1. The induction chip 31 fixed by welding can be firmly attached to the housing 1, which can prevent the induction chip 31 from falling off during the long-term operation of the circuit breaker 100.

[0043] According to some embodiments of the present invention, in combination with Figure 2 and Figure 3 , the circuit breaker 100 further includes a circuit board 3. The circuit board 3 is arranged inside the housing 1, and the induction chip 31 is integrated on the circuit board 3. The induction chip 31 detects the working signal of the circuit breaker component 2.

[0044] In combination with Figure 2 , the circuit board 3 is arranged inside the housing 1. For example, the circuit board 3 can be set as a PCB board. A PCB board is a board-like material composed of insulating substrates, conductive patterns, holes, etc. Through specific manufacturing processes, the electrical connection lines of various electronic components are printed on the insulating substrate to achieve the electrical connection and mechanical fixation between electronic components. At the same time, it also plays roles such as insulation, isolation, and heat dissipation, ensuring the stability and reliability of electronic devices. Thus, integrating the induction chip 31 on the circuit board 3 is beneficial to the realization of the functions of the induction chip 31 and is also beneficial to the control of other components by the circuit board 3. In addition, the induction chip 31 is suitable for communicating with the control board 91 of the electronic control unit 9. The induction chip 31 can be used to detect current signals or other working signals (such as voltage and temperature, etc.) flowing through the circuit breaker component 2. When the induction chip 31 detects a fault (such as over-current of the current flowing through the circuit breaker component 2, over-temperature of the circuit breaker component 2, etc.), it can quickly transmit the fault signal to the control board 91 of the electronic control unit 9, thereby triggering the next action to cut off the circuit breaker 100 and ensuring the safety of the vehicle. Additionally, by integrating the induction chip 31 on the circuit board 3, the space occupied by the induction chip 31 on the circuit board 3 is small, which is more conducive to the integration of the circuit breaker 100. When the circuit breaker 100 is used in a vehicle, the space utilization rate of the whole vehicle can be improved.

[0045] According to some embodiments of the present invention, in combination with Figure 2 and Figure 3 , one side of the circuit board 3 facing the disconnector 2 is provided with a shielding member 5.

[0046] Specifically, in combination with Figure 2 and Figure 3 , a shielding member 5 is provided at a position on the upper side in the height direction of the circuit board 3 close to the disconnector 2. With such a setting, there is a capacitance coupling phenomenon between various circuit components on the circuit board 3, which may lead to signal crosstalk and transmission distortion. Setting the shielding member 5 on the upper side of the circuit board 3 can reduce the capacitance coupling between the circuit breaker 100 and other circuit components, reduce signal interference, and ensure the accuracy and stability of signal transmission in the circuit. In addition, it can effectively reduce the interference of external electromagnetic signals when the induction chip 31 is in a high-voltage working state, ensure the monitoring of the working state of the disconnector 2 by the induction chip 31, so as to quickly and accurately make a response, and realize the control of the disconnector 2.

[0047] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 , the circuit breaker 100 further includes at least one arc extinguishing member 4, and the arc extinguishing member 4 is located between the disconnector 2 and the shielding member 5. The above "at least one" means that the arc extinguishing member 4 is at least one, and may also be multiple.

[0048] For example, in the example of Figure 2 , an arc extinguishing member 4 is provided on the upper side in the thickness direction of the shielding member 5 (that is, the up and down direction in Figure 2 ). When a circuit fails, an arc is generated when the disconnector 2 disconnects to cut off the circuit. With such a setting, the arc extinguishing member 4 has good heat conduction performance, can quickly absorb the heat of the arc and dissipate it, so that the arc temperature is rapidly reduced, the energy of the arc is weakened, and then the arc is extinguished. In addition, the arc extinguishing member 4 can divide the arc into multiple small arcs, which helps to extinguish the arc. Moreover, the presence of the arc extinguishing member 4 can quickly extinguish the arc generated when the circuit is disconnected, thereby shortening the existence time of the arc, protecting the circuit components and enabling them to return to the normal working state faster, and improving the working efficiency of the circuit breaker 100.

[0049] In addition, referring to Figure 2 , the arc extinguishing member 4 is arranged inside the housing 1. With such a setting, arranging the arc extinguishing member 4 inside the housing 1 makes the internal structure of the circuit breaker 100 more compact, is more conducive to the integration of the circuit breaker 100, and improves the space utilization rate of the whole vehicle. Moreover, it can effectively limit the arc generated when the circuit breaker 100 cuts off the circuit inside the housing 1, avoid the arc from causing harm to the surrounding personnel and equipment, and improve the safety of using the circuit breaker 100.

[0050] Referring to Figure 2, the breaking member 2, the arc extinguishing member 4 and the shielding member 5 are arranged along the height direction of the circuit breaker 100 (i.e., Figure 2 the up and down direction in

[0051] ), and the arc extinguishing member 4 is located between the breaking member 2 and the shielding member 5. Thus, this layout can make the internal structure of the circuit breaker 100 more compact. The arc extinguishing member 4 cooperates with the breaking member 2 and the shielding member 5, rationally utilizes the space, and improves the utilization rate of the internal space of the circuit breaker 100. In addition, the shielding member 5 can block the electromagnetic interference generated by the arc from spreading outwards. The arc extinguishing member 4 is arranged close to the breaking member 2, which is more conducive to the arc extinguishing of the arc extinguishing member 4 and can also enable the shielding member 5 to better play its role, protecting the surrounding electronic devices from the influence of electromagnetic interference and improving the stability and reliability of the entire drive system 200. Figure 2 and Figure 4 , the arc extinguishing member 4 is arranged on the shielding member 5. For example, in Figure 2 's example, the arc extinguishing member 4 is connected to the upper surface of the shielding member 5. The shielding member 5 has certain high-temperature resistance and insulation properties. Arranging the arc extinguishing member 4 on the shielding member 5 can achieve a better effect of guiding the arc. When an arc is generated due to circuit fusing, arranging the arc extinguishing member 4 on the shielding member 5 can achieve the effect of guiding the arc to move upwards, which can effectively increase the contact area between the arc and the surrounding medium and the heat dissipation effect, and accelerate the cooling and extinguishing of the arc. In addition, the generation and extinguishing process of the arc will be accompanied by the release of electromagnetic energy, which may generate electromagnetic interference to the surrounding electronic devices and communication lines. Thus, arranging the arc extinguishing member 4 on the shielding member 5 can play a certain electromagnetic shielding role, reduce the electromagnetic radiation generated by the arc, and reduce the interference to the surrounding electromagnetic environment, ensuring the normal operation of other circuit breakers 100.

[0052] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 , there are multiple arc extinguishing members 4, and the multiple arc extinguishing members 4 are arranged along the length direction of the breaking member 2. In the description of the present invention, the meaning of "multiple" is two or more.

[0053] For example, in Figure 2 's example, there are two arc extinguishing members 4, and the two arc extinguishing members 4 are respectively close to the shielding member 5 along the length direction of the breaking member 2 (for example, Figure 2On both sides of the direction indicated by arrow A in the figure). Thus, the two arc extinguishing members 4 are arranged along the length direction of the breaking member 2, which can make full use of the horizontal space, make the internal structure of the circuit breaker 100 more compact, thereby improving the integration of the circuit breaker 100 and being conducive to the integrated development of the circuit breaker 100. Moreover, this arrangement can accommodate more arc extinguishing components such as the arc extinguishing member 4 in a limited space, improving the arc extinguishing efficiency. In addition, it is also conducive to forming a relatively uniform electric field, thereby improving the arc extinguishing effect. It should be noted that the number and arrangement position of the arc extinguishing members 4 can be set according to the actual situation to better meet the actual application.

[0054] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 , each arc extinguishing member 4 includes quartz sand, a fuse, or a plurality of stacked conductive sheets.

[0055] For example, quartz sand has good insulation performance and high thermal conductivity. When an arc appears inside the circuit breaker 100, the quartz sand can quickly absorb the heat generated by the arc, reduce the arc temperature, accelerate the cooling and extinguishing of the arc, and effectively improve the arc extinguishing efficiency. In addition, the quartz sand can also form a physical barrier to prevent the splashes generated during the combustion of the arc from damaging the surrounding equipment and circuits. Thus, the arc extinguishing member 4 containing quartz sand can absorb the arc heat, accelerate the extinguishing and cooling of the arc, and control the arc within a certain space range to prevent its splashing, improving the safety of the circuit.

[0056] The fuse is usually a fusible metal wire or metal sheet. When the current in the circuit exceeds its rated current, the fuse will melt due to heat, thereby cutting off the circuit and preventing the electrical equipment in the circuit from being damaged due to overload.

[0057] When a fault occurs in the circuit and an arc is generated, the arc will form multiple small segments between different conductive sheets, increasing the length of the arc. According to the volt-ampere characteristic of the arc, when the arc is elongated, the arc voltage increases, making it more difficult to maintain the arc, thereby accelerating the extinguishing of the arc. The conductive sheets will absorb the heat of the arc during the combustion of the arc. Multiple stacked conductive sheets can provide a larger heat dissipation area, accelerating the dissipation of the arc heat and rapidly reducing the arc temperature. When the arc temperature drops to a certain degree, the plasma in the arc will quickly recombine, thereby achieving arc extinguishing. In addition, the overall structure of the arc extinguishing member 4 formed by stacking multiple conductive sheets is more stable, and it is not easy to deform, damage, etc., ensuring the normal operation of the arc extinguishing member 4.

[0058] According to some embodiments of the present invention, in combination with Figure 1 , a first ground wire 51 is provided on the shielding member 5.

[0059] For example, a first ground wire 51 is led out from the shielding member 5. Multiple small electric arcs generated during the arc extinguishing of the arc extinguishing member 4 can be grounded through the first ground wire 51. The first ground wire 51 is connected to the ground, which can play a role in shielding and discharging electromagnetic energy, reducing the influence of electromagnetic interference generated during the arc extinguishing process on surrounding electrical equipment and signal transmission, and weakening the generated electric arcs, ensuring the normal operation of the circuit breaker 100. Moreover, the first ground wire 51 can also ensure the safety of the human body or the circuit breaker 100. In addition, the setting of the first ground wire 51 can also shield the interference of electromagnetic signals.

[0060] According to some embodiments of the present invention, in combination with Figure 1 , one end of the first ground wire 51 passes through the housing 1 and extends to the outside of the housing 1. For example, in combination with Figure 1 , the first ground wire 51 passes through the housing 1 and extends to the outside of the housing 1 to be connected to the ground. According to the equipotential principle of the grounding system, the first ground wire 51 is connected to the ground, so that the arc extinguishing member 4 can maintain equipotential with the ground in both normal and fault states. When there is current to pass through the shielding member 5, since the potential of the ground is zero and the capacitance is infinite, the current will preferentially flow into the ground through the first ground wire 51 instead of through the human body or the circuit breaker 100, thereby realizing functions such as protection and auxiliary arc extinguishing, and effectively ensuring the safety of the human body or the circuit breaker 100.

[0061] According to some embodiments of the present invention, in combination with Figure 1 and Figure 4 , the breaking member 2 includes a connecting section 20 and an overcurrent section 23. Specifically, at least part of the connecting section 20 passes through the housing 1 and extends to the outside of the housing 1. The overcurrent section 23 is connected to the connecting section 20, and a cutting groove 231 is formed on the overcurrent section 23.

[0062] For example, in the examples of Figure 2 and Figure 4 , the breaking member 2 is composed of a connecting section 20 and an overcurrent section 23. Among them, the connecting section 20 extends left and right along the length direction of the circuit breaker 100 (for example, the direction indicated by the arrow A in Figure 2 ), and at least part of the connecting section 20 passes through the left and right side walls of the housing 1 and extends to the outside of the housing 1, while the overcurrent section 23 is covered inside the housing 1. Thus, the left end and the right end of the connecting section 20 can respectively pass through the left side wall and the right side wall of the housing 1 and extend to the outside of the housing 1 to be respectively adapted to be connected to the motor 10 and the inverter 92. In addition, the overcurrent section 23 is covered inside the housing 1, which can prevent the situation of part splashing when the circuit breaker 100 operates to cut off the circuit, protecting the internal circuit elements of the circuit breaker 100 and the circuit elements nearby from being damaged. Moreover, the structures of the connecting section 20 and the overcurrent section 23 are simple, reducing the processing difficulty of the breaking member 2, being conducive to the mass production and processing of the breaking member 2, and improving production efficiency.

[0063] In addition, a cutting groove 231 is formed on the overcurrent section 23. After the cutting groove 231 is cut, the circuit breaker 2 is disconnected to cut off the circuit connection between the inverter 92 and the motor 10. When the two signal components 6 receive the voltage signal from the signal processing chip, the two signal components 6 will generate current to ignite the fuel 71 in the combustion chamber 7. The energy and pressure generated by the combustion of the fuel 71 quickly push the inference device 8 to move, causing the cutting groove 231 at the bottom of the circuit breaker 2 to be disconnected, thereby cutting off the circuit and realizing the protection of the circuit. In addition, the cutting groove 231 fits with the inference device 8, making the position where the circuit breaker 2 is cut more accurate. Moreover, the structure of the cutting groove 231 is simple, which simplifies the structure of the circuit breaker 2, reduces the production difficulty, and thus can improve the production efficiency.

[0064] According to some embodiments of the present invention, in combination with Figure 1 and Figure 4 , the connecting section 20 includes a first connecting section 21 and a second connecting section 22. Specifically, one end of the first connecting section 21 passes through the side wall of the housing 1 and extends outside the housing 1, and the other end of the first connecting section 21 is connected to one end of the overcurrent section 23. One end of the second connecting section 22 passes through the other side wall of the housing 1 and extends outside the housing 1, and the other end of the second connecting section 22 is connected to the other end of the overcurrent section 23.

[0065] For example, in combination with Figure 4 , both the first connecting section 21 and the second connecting section 22 extend in the horizontal direction (for example, Figure 2 the direction indicated by the arrow A in

[0066] ), and the mutually remote ends of the first connecting section 21 and the second connecting section 22 respectively pass through the side walls on the left and right sides of the housing 1 and extend outside the housing 1. The above-mentioned one end of the first connecting section 21 is adapted to be connected to the inverter 92, the above-mentioned one end of the second connecting section 22 is adapted to be connected to the motor 10, and the above-mentioned other ends of the first connecting section 21 and the second connecting section 22 are connected to the overcurrent section 23. Thus, it is convenient for the first connecting section 21 and the second connecting section 22 to pass through the housing 1 and extend outside the housing 1 to be respectively connected to the motor 10 and the inverter 92. In addition, the ends of the first connecting section 21 and the second connecting section 22 located inside the housing 1 are respectively connected to the overcurrent section 23, thereby forming a complete circuit breaker 2. Moreover, the structures of the first connecting section 21, the second connecting section 22, and the overcurrent section 23 are simple, reducing the processing difficulty of the circuit breaker 2, facilitating the mass production and processing of the circuit breaker 2, and improving the production efficiency.

[0067] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4, in the direction from the other end of the first connecting section 21 towards the other end of the second connecting section 22, the current-carrying section 23 first bends and extends towards the side where the circuit board 3 is located, and then bends and extends towards the side away from the side where the circuit board 3 is located.

[0068] For example, in Figure 2 and Figure 4 's example, the circuit breaker 2 has a shape with flat sides and a concave middle, and the current-carrying section 23 can be set in a semi-circular structure. That is, the first connecting section 21 and the second connecting section 22 are flat plates, and the current-carrying section 23 protrudes towards the side where the circuit board 3 is located, that is, the lower side in the height direction of the circuit breaker 100. With such a setting, other components of the circuit breaker 100, such as the combustion chamber 7 and the inference device 8, can be arranged in the concave area of the circuit breaker 2, which is beneficial for the inference device 8 to cut off the cutting groove 231 and is also beneficial for the utilization of the space inside the housing 1, and the arrangement of the components inside the housing 1 is more compact.

[0069] According to some embodiments of the present invention, in combination with Figure 1 and Figure 2 , the circuit breaker 100 further includes a signal member 6, the signal member 6 is provided on the housing 1, and the signal member 6 is adapted to communicate with the control board 91. For example, in combination with Figure 1 and Figure 2 , the signal member 6 is provided at the upper end in the height direction of the housing 1 and extends to the outside of the housing 1. The signal member 6 can be used to receive the voltage signal transmitted by the signal processing chip on the control board 91 to control the circuit breaker 2 to disconnect and protect the motor 10 or the inverter 92 from being damaged by short-circuit current or electric arc.

[0070] According to some embodiments of the present invention, in combination with Figure 1 and Figure 2 , there are two signal members 6, the two signal members 6 are respectively a positive signal line and a negative signal line, and the two signal members 6 are adapted to receive the voltage signal of the control board 91 to trigger the cutting off of the circuit breaker 2. That is, the two signal members 6 can be regarded as the positive and negative poles in the circuit and can be used to receive the voltage signal transmitted by the signal processing chip on the control board 91.

[0071] For example, in the present application, the circuit breaker 100 can be regarded as a 6Ω resistor. When the controller chip on the control board 91 receives the IPM fault signal (i.e., the first fault) fed back by the drive chip on the drive board, and fault signals such as the current in the power input channel of the motor 10 exceeding the preset current threshold, the speed of the motor 10 exceeding the preset speed threshold, the temperature of the power input channel of the motor 10 exceeding the preset temperature threshold, or the back electromotive force of the motor 10 being abnormal (i.e., the second fault) fed back by the induction chip 31, the controller chip transmits the fault signal to the signal processing chip on the control board 91, and the signal processing chip outputs a 12V voltage signal to the two signal components 6. According to Ohm's law, there is a current of 2A in the signal component 6 at this time. When the current in the signal component 6 is greater than or equal to 1.5A, the fuel 71 in the combustion chamber 7 will be ignited, and the combustion of the fuel 71 generates a force to push the inference device 8 towards the breaking member 2 to cut off the breaking member 2 (such as a three-phase copper bar) to cut off the circuit, thereby ensuring the safety of circuit components and nearby operators.

[0072] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 , the circuit breaker 100 further includes a combustion chamber 7 and an inference device 8. Specifically, the combustion chamber 7 is provided in the housing 1, and the combustion chamber 7 is provided with fuel 71. When the voltage on the signal component 6 is greater than or equal to the preset voltage, the fuel 71 is ignited to trigger the cutting off of the breaking member 2. The inference device 8 is provided between the combustion chamber 7 and the breaking member 2, and the combustion of the fuel 71 pushes the inference device 8 towards the breaking member 2 to cut off the breaking member 2.

[0073] For example, in Figure 2 example, the combustion chamber 7 and the inference device 8 are provided in the housing 1, the combustion chamber 7 and the inference device 8 are provided above the overcurrent section 23, and the inference device 8 is vertically opposite to the cutting groove 231. In addition, the inference device 8 is vertically opposite to the cutting groove 231. The combustion chamber 7 is mainly used to provide a reaction environment for the detonation of the fuel 71. The lower ends of the two signal components 6 extend into the combustion chamber 7, and the fuel 71 is placed in the combustion chamber 7.

[0074] For example, when two signal components 6 receive the voltage signal from the signal processing chip, the two signal components 6 are energized to generate current. When the current generated by the two signal components 6 is greater than or equal to a preset current, for example, the preset current is 1.5 A, and the current on the two signal components 6 is greater than or equal to 1.5 A, the fuel 71 in the combustion chamber 7 will be ignited. At the moment when the fuel 71 in the combustion chamber 7 is ignited, a relatively large pressure and impact force can be generated, which can push the inference device 8 to move within a short period of time, so that the component connecting the circuit (such as the breaking component 2) is disconnected, thereby quickly cutting off the main circuit of the power system, avoiding the continuous existence of short-circuit current, and preventing more serious safety accidents such as battery overheating, fire, and even explosion. In addition, a strong electric arc will be generated at the moment of cutting off the circuit, and the gas generated by the combustion of the combustion chamber 7 can change the shape and propagation path of the electric arc, reduce the energy of the electric arc, make the electric arc extinguish faster, and improve the service life and reliability of the circuit breaker 100.

[0075] In addition, the inference device 8 is arranged between the combustion chamber 7 and the breaking component 2, and the inference device 8 can move to be close to the breaking component 2 and fit with the cutting groove 231 of the breaking component 2. Thus, the cutting of the inference device 8 is more accurate, which is more conducive to cutting off the breaking component 2. Combining Figure 4 , the bottom of the inference device 8 has an inference structure 81, such as a tungsten carbide cutting blade. When the fuel 71 in the combustion chamber 7 is ignited, the combustion of the fuel 71 drives the combustion chamber 7 to push the inference device 8 towards the breaking component 2, that is, the inference device 8 moves towards the lower side in the height direction of the circuit breaker 100, so that the tungsten carbide cutting blade at the bottom of the inference device 8 quickly cuts off the copper busbar, and then cuts off the circuit. Moreover, the combustion chamber 7 is located above the inference device 8 and is relatively close to the position of the signal component 6. When the signal component 6 receives the trigger signal, it can quickly ignite the fuel 71 in the combustion chamber 7, thereby disconnecting the circuit connection within an extremely short time.

[0076] According to some embodiments of the present invention, combining Figure 2 and Figure 4 , the fuel 71 includes a first fuel 711, and the first fuel 711 burns to generate a force acting on the inference device 8 to push the inference device 8 towards the breaking component 2 to cut off the breaking component 2.

[0077] Referring to Figure 2 , the fuel 71 in the combustion chamber 7 includes a first fuel 711. After the first fuel 711 is ignited, it quickly reacts and explodes, generating a strong thrust to push the inference device 8 to move downward to cut off the breaking component 2, so that the breaking component 2 connecting the circuit is disconnected, thereby quickly cutting off the circuit of the drive system 200. Among them, the combustion of the first fuel 711 provides the main energy source for the entire circuit cutting action, and the energy generated by its combustion acts on the inference device 8 to make the inference device 8 move downward, which can achieve a fast and accurate circuit cutting effect.

[0078] According to some embodiments of the present invention, in combination with Figure 2 and Figure 4 , the fuel 71 further includes a second fuel 712. The second fuel 712 burns to generate gas to transfer the arc generated when the disconnection member 2 disconnects to the arc extinguishing member 4. Refer to Figure 2 . The fuel 71 in the combustion chamber 7 further includes a second fuel 712. A huge arc will be generated when the high-voltage circuit is cut off. The second fuel 712 will generate gas during the reaction process. The generated gas can cool the arc and mix the plasma of the arc with the surrounding air, and transfer the arc to the arc extinguishing member 4 through electromagnetic interaction, and further decompose the arc into multiple series-connected arcs, that is, decomposed into arcs with smaller voltages, so as to achieve the effect of arc extinguishing and reduce the damage of the arc to the circuit and surrounding components.

[0079] According to some embodiments of the present invention, in combination with Figure 3 , the induction chip 31 includes a Hall sensor chip.

[0080] For example, a Hall sensor is a sensor that uses the Hall effect to measure physical quantities such as magnetic fields, currents, and displacements. The Hall sensor does not need to be in direct contact with the object to be measured to detect changes in the magnetic field, can quickly respond to changes in the magnetic field and provide high measurement accuracy.

[0081] In this application, the induction chip 31 can be set as a Hall sensor chip. In addition, other signal detection sensors, such as temperature sensor chips and voltage detection chips, can also be integrated on the circuit board 3 to improve the component integration of the circuit breaker 100 and facilitate the detection of other signals. Specifically, the Hall sensor chip integrates multiple functional modules such as Hall elements, amplifiers, signal processing circuits, and temperature compensation circuits into one chip, greatly reducing the number of external components used and the occupied space of the circuit board 3. Since the Hall sensor chip is small in size and relatively few in pin numbers, the Hall sensor chip can be firmly fixed on the circuit board 3 of the circuit breaker 100 by welding, thereby reducing the installation difficulty and cost of the circuit breaker 100 and improving production efficiency. When there is current passing through the circuit breaker 100, a corresponding magnetic field will be generated, and this magnetic field acts on the Hall sensor chip to generate a Hall voltage. By detecting the magnitude of the Hall voltage, the magnitude of the current passing through the circuit breaker 100 can be indirectly measured. When the current flowing through the disconnection member 2 exceeds the preset current threshold (that is, when the phase current is overcurrent), a signal can be fed back to the control board 91 to control the disconnection of the disconnection member 2.

[0082] With such a setting, by fixing the Hall sensor chip on the circuit board 3 through welding, while the sensing chip 31 has the function of a Hall sensor, the occupied space of the Hall sensor in the circuit breaker 100 is effectively reduced, which is beneficial to the integration inside the circuit breaker 100, and thus beneficial to the integration and functionality of the electric vehicle assembly. In addition, the integration of the Hall sensor chip also further improves its anti-interference ability, thereby ensuring the reliability of its measurement results and detection sensitivity.

[0083] In some other embodiments of the present application, the sensing chip 31 further includes a temperature sensor chip and a voltage detection chip. The temperature sensor chip can be used to detect the temperature at which the breaker 2 operates, and the voltage detection chip can be used to detect the voltage signal in the motor 10. The sensing chip 31 is adapted to communicate with the control board 91 of the electronic control unit 9. When the temperature and voltage detected by the sensing chip 31 exceed the temperature threshold or voltage threshold, the temperature sensor chip and the voltage detection chip will transmit signals to the controller chip, thereby causing the circuit breaker 100 to cut off the circuit and protect the circuit safety. It should be noted that the types of chips included in the sensing chip 31 can be set according to the actual situation and are not specifically limited here.

[0084] According to some embodiments of the present invention, in combination with Figure 1 and Figure 3 , a plurality of wires 32 are provided on the circuit board 3, and at least the second ground wire, power supply wire, and communication wire are included in the plurality of wires 32. Specifically, the second ground wire is mainly used for the safety protection of the circuit breaker 100. For example, when a fault occurs inside the circuit breaker 100, it will cause the circuit breaker 100 to be charged. At this time, the second ground wire can introduce the current into the ground, avoiding electric shock accidents when the operator touches the circuit breaker 100. At the same time, the second ground wire can also play a role in shielding interference, reducing the influence of external electromagnetic interference on the circuit, and improving the stability and reliability of the circuit. The main function of the power supply wire is to transmit voltage and provide electrical energy for the circuit. It carries a high-potential current, outputs from a power source (such as a transformer, generator, etc.), and transports the electrical energy to the sensing chip 31 on the circuit board 3 so that they can work normally. The communication wire can realize the communication interaction between the sensing chip 31 and the controller chip (such as CPLD) on the control board 91.

[0085] According to some embodiments of the present invention, in combination with Figure 1 and Figure 3 , one ends of the plurality of wires 32 respectively pass through the housing 1 and extend to the outside of the housing 1. In combination with Figure 1 and Figure 3, a plurality of wires 32 are provided near the edge of the circuit board 3, and one ends of the plurality of wires 32 respectively pass through the housing 1 and extend to the outside of the housing 1. Thus, the plurality of wires 32 extend through the housing 1 to the outside of the housing 1, and the second ground wire extends to the outside and is connected to a dedicated grounding device, which can ensure that when a leakage or other fault occurs in the circuit board 3, the current can quickly flow into the ground through the second ground wire, thereby protecting the safety of the equipment and personnel. In addition, the shielding effect of the outer shell can be utilized to reduce the interference of the external electromagnetic field on the communication line and ensure the stability and reliability of the communication.

[0086] According to some embodiments of the present invention, the breaking member 2 includes a copper busbar or an aluminum busbar.

[0087] For example, the breaking member 2 is a three-phase copper busbar. Copper has good electrical conductivity, and there are a large number of freely movable electrons inside it. When the circuit is switched on, under the action of the electric field, these free electrons move directionally to form an electric current, so that the copper busbar can transmit the current from one end of the circuit to the other end, realizing the transfer of electrical energy between the circuit breaker 100 and other circuit elements. When a short-circuit fault occurs in the circuit, a short-circuit current far exceeding the normal working current will appear instantaneously. The copper busbar has good electrical conductivity and mechanical strength, and can withstand the electrodynamic force and heat generated by the huge short-circuit current in a short time without being immediately damaged, buying time for the circuit breaker 100 to operate and cut off the circuit.

[0088] Aluminum is easy to form a dense aluminum oxide film in the air. This oxide film can protect the inside of the aluminum busbar from being corroded by the external environment and has good corrosion resistance. In some harsh working environments, such as humid places with chemically corrosive gases, the aluminum busbar can maintain good electrical and mechanical properties, thereby extending the service life of the circuit breaker 100. In addition, aluminum has a relatively small density and good processing performance. When the aluminum busbar is used for the breaking member 2, it is beneficial to reduce the overall weight of the circuit breaker 100, facilitate manufacturing and assembly, and improve production efficiency. Moreover, the price of aluminum is relatively lower than that of copper, and using the aluminum busbar as the breaking member 2 can reduce the manufacturing cost of the circuit breaker 100.

[0089] Preferably, since the electrical conductivity of the aluminum bar is lower than that of the copper bar, the current-carrying capacity of the copper bar is higher than that of the aluminum bar, which is more conducive to transmitting current and reducing power loss. For example, in the protection of the motor 10, one end of the copper bar is fixedly connected to one end of the inverter 92 by bolts, and the other end is fixed to the output end of the inverter 92 to form a complete circuit path. When a fault such as a short circuit occurs in the motor 10 or the inverter 92, the circuit breaker 100 operates quickly to push the inference device 8 to cut the copper bar, thereby cutting off the circuit and ensuring the safety of the circuit system. In addition, the thickness and surface area of the copper bar have a great influence on its current-carrying capacity. According to the resistance law, under the condition that other conditions remain unchanged, when the thickness of the copper bar increases and the cross-sectional area increases, the resistance will decrease. According to Ohm's law, when the voltage is constant, the resistance decreases, and the current passing through the copper bar can be larger, that is, the current-carrying capacity is enhanced. In addition, according to Newton's heat dissipation formula, when current passes through the copper bar to generate heat, the larger the surface area, the better the heat dissipation effect, the more heat can be dissipated, and the smaller the temperature rise of the copper bar. The smaller the temperature rise, within the allowable operating temperature range, the larger the current that the copper bar can pass through. That is to say, within a certain range, the larger the thickness and surface area of the copper bar, the stronger its current-carrying capacity and the better its heat dissipation effect. In the actual circuit breaker 100, the appropriate thickness and surface area of the copper bar can be set according to the actual current condition.

[0090] Combined with Figure 1 , the housing 1 can be set as a plastic housing. The housing 1 includes a connected first housing 11 and a second housing 12. The circuit board 3 is connected to the bottom of the second housing 12, and the lower side of the first housing 11 is connected to the top of the second housing 12. The circuit board 3, the first housing 11 and the second housing 12 jointly define an internal space for installing the combustion chamber 7, the inference device 8, etc. Among them, the first housing 11 is cylindrical, and the diameter and height of the cylinder can be set according to the requirements in actual applications. The second housing 12 is in the shape of a cuboid or a cube, and the length, width and height of the cube of the second housing 12 can be set according to the actual situation.

[0091] Thus, the housing 1 can enclose the internal parts of the circuit breaker 100 inside, which can play a good protective role for the internal parts of the circuit breaker 100 and prevent the internal parts of the circuit breaker 100 from splashing. The first housing 11 and the second housing 12 are cylindrical and cubic respectively, and the shape of the housing 1 is regular, and the molding difficulty is low, effectively reducing the overall molding difficulty of the circuit breaker 100. In addition, the material of the housing 1 is plastic, so that the processing cost of the housing 1 is low, thereby effectively controlling the processing cost of the circuit breaker 100. Moreover, the plastic housing 1 has good insulation effect, which can ensure the safety of the circuit and the working effect of the circuit breaker 100. In addition, the processing accuracy of the housing 1 is improved, and it is convenient to install the circuit breaker 100 at different positions.

[0092] In some embodiments, the induction chip 31 (such as a Hall sensing chip, etc.) can be integrated on the circuit board 3 inside the circuit breaker 100. The volume of the induction chip 31 is much smaller than that of the Hall sensor, which can make full use of the limited space inside the circuit breaker 100, make the overall structure more compact, improve the integration inside the circuit breaker 100, and thus improve the space utilization rate of the whole vehicle. In addition, the distance between the circuit board 3 and the breaking member 2 is short, which can effectively shorten the signal transmission path, effectively reduce the interference and attenuation during signal transmission, ensure the accuracy and stability of the detection signal, so that the induction chip 31 can quickly and accurately detect the signal of the breaking member 2, and then enable the circuit breaker 100 to quickly and accurately detect faults and act in time to cut off the circuit breaker 100. Further, other functions of the induction chip 31 can be linked with the controller of the motor 10.

[0093] According to a second aspect embodiment of the present invention, the drive system 200, in combination with Figure 6 , includes an electronic control unit 9, a motor 10, and a circuit breaker 100. Specifically, the electronic control unit 9 includes an inverter 92. The circuit breaker 100 is the circuit breaker 100 according to the above first aspect embodiment. The circuit breaker 100 is connected between the inverter 92 and the motor 10, and the control board 91 controls the circuit breaker 100 to open.

[0094] Specifically, the drive system 200 includes an electronic control unit 9, a motor 10, and a circuit breaker 100. A circuit breaker 100 is provided between the inverter 92 of the electronic control unit 9 and the motor 10. The circuit breaker 100 functions as a switch to connect and disconnect the circuit connection between the inverter 92 and the motor 10. When the control board 91 receives a fault signal, after the signal member 6 of the circuit breaker 100 receives the voltage signal from the signal processing chip of the control board 91, a current will be generated, thereby igniting the fuel 71 in the combustion chamber 7, pushing the inference device 8 towards the breaking member 2 to cut off the breaking member 2, and the circuit breaker 100 opens, thus ensuring the safety of circuit components and nearby operators.

[0095] According to a second aspect embodiment of the present invention, by adopting the circuit breaker 100 in the above first aspect embodiment, the circuit breaker 100 is arranged between the inverter 92 and the motor 10. When a fault occurs in the motor 10 and the electronic control unit 9, the circuit breaker 100 can quickly cut off the circuit after receiving the signal, ensuring the safety of circuit components and nearby operators. In addition, the induction chip 31 has accurate detection, the signal processing chip has accurate on-off control of the circuit breaker 100, and is sensitive in response, improving the performance of the drive system 200.

[0096] According to some embodiments of the present invention, in combination with Figure 6, the inverter 92 includes three parallel bridge arms 921. The motor 10 has three power input channels, which are respectively connected to the midpoints of the three bridge arms 921. The three power input channels are respectively connected to the three bridge arms 921, and at least two of the three power input channels are provided with circuit breakers 100 between them and the corresponding bridge arms 921.

[0097] Combined with Figure 6 , in this application, the inverter 92 in the electronic control unit 9 is a three-phase inverter. Among them, the inverter 92 is mainly composed of a DC power supply, power switching devices, a control circuit, a filtering circuit, etc. The inverter 92 includes three parallel bridge arms 921 (such as Figure 6 the three bridge arms 921 composed of three groups of upper and lower bridge arms Q1~Q6 in

[0098] The motor 10 has three power input channels, which are respectively and correspondingly connected to the midpoints of the three bridge arms 921. At least two of the three power input channels are respectively provided with circuit breakers 100 between them and the corresponding bridge arms 921. Thus, by setting the circuit breakers 100 in at least two channels, it is not necessary for each bridge arm 921 to be connected to the circuit breaker 100. Only two circuit breakers 100 can cut off the electrical connection between the inverter 92 and the motor 10, making the circuit design simpler and reducing the number of circuit breakers 100 used.

[0099] Specifically, combined with Figure 6 , the battery pack 201 is connected to the power supply of the inverter 92. The battery pack 201 provides direct current to the bus capacitor C for energy storage, stabilizes the current, and at the same time filters the direct current to obtain smoother direct current. The inverter 92 converts the direct current into alternating current and finally outputs it to the motor 10 through the circuit breaker 100 to drive the motor 10 to work. A circuit breaker 100 is respectively connected to two of the bridge arms 921 between the motor 10 and the inverter 92. When the control board 91 receives the first fault and the second fault, the control board 91 promptly drives the circuit breaker 100 to cut off the circuit. At this time, the alternating current cannot form a closed-loop circuit, preventing the back electromotive force from flowing back to the inverter 92 and ensuring that the vehicle can stop safely and smoothly when the inverter 92 fails. For example, applying the circuit breaker 100 to the protection of the electric vehicle battery pack 201, combined with the control strategy of the inverter 92, triggers the circuit breaker 100 to quickly disconnect any two bridge arms 921 in the inverter 92, further improving the safety and reliability of the electric vehicle.

[0100] According to some embodiments of the present invention, in combination with Figure 6 , the electronic control unit 9 further includes a control board 91, and the control board 91 controls the circuit breaker 100 to open. The control board 91 is a core component of the electronic control unit 9. The control board 91 can be used to receive signals from various sensors of the vehicle, such as temperature, pressure, rotational speed, position, etc., convert these analog signals into digital signals, and perform processing and analysis, so as to achieve precise control of various components of the vehicle. For example, when the control board 91 receives a fault signal, the control board 91 can transmit a voltage signal to the circuit breaker 100 to control the circuit breaker 100 to open to ensure circuit safety.

[0101] According to some embodiments of the present invention, the electronic control unit 9 further includes a drive board, and the drive board drives the inverter 92 to work. The drive chip of the drive board detects IPM faults. For example, the drive board can be used to drive the inverter 92 to work, and the drive chip communicates with the power module to detect IPM faults. During the operation of the motor 10, the power module can monitor parameters such as the current and temperature of the motor 10 in real time. For example, when the motor 10 has abnormal conditions such as overload, short circuit, overcurrent, overheating, etc., the power module will act quickly. After the drive chip detects an IPM fault, it will feedback the signal to the controller chip of the control board 91. The controller chip communicates with the signal processing chip, and the signal processing chip controls the circuit breaker 100 to open to cut off the circuit or take other protection measures to prevent the motor 10 and other related devices from being damaged and ensure the safe and stable operation of the entire drive system 200. Thus, the drive chip can detect the IPM fault signal in a timely manner, which is beneficial to the control of the operation of the circuit breaker 100.

[0102] According to some embodiments of the present invention, the control board 91 includes a controller chip and a signal processing chip. The controller chip communicates with the signal processing chip, the drive chip, and the induction chip 31 of the circuit breaker 100 respectively, and the signal processing chip communicates with the signal component 6 of the circuit breaker 100.

[0103] For example, the controller chip is the core of the vehicle electronic control unit 9. The controller chip communicates with other control units, such as the signal processing chip, the drive chip, and the induction chip 31 of the circuit breaker 100, etc., at a high speed to achieve information sharing and collaborative work among various modules. For example, when the vehicle starts, the controller chip will communicate with the signal processing chip, the drive chip, and the induction chip 31 of the circuit breaker 100, etc., to obtain the state information of the vehicle to ensure that the vehicle is in a safe driving state. That is to say, the controller chip can receive various fault signals fed back by the drive chip and the induction chip 31, and transmit the signals to the signal processing chip. The signal processing chip outputs a voltage signal to open the circuit breaker 100. For example, the controller chip can be a CPLD chip.

[0104] The signal processing chip is a microprocessor chip dedicated to digital signal processing. When abnormal conditions such as overload, overheat, and short circuit occur in the motor 10, the signal processing chip will control other components to work, for example, control the circuit breaker 100 to disconnect, ensuring the safe operation of the vehicle. For example, the signal processing chip can be set as a DSP chip.

[0105] When a fault occurs in the circuit of the drive system, such as faults like undervoltage of the drive chip, over-temperature or over-current of the motor 10, the fault signal will be transmitted to the controller chip on the control board 91, and the controller chip will further transmit the fault signal to the signal processing chip. At this time, the signal processing chip will generate a corresponding fault signal, which is usually a specific voltage signal. For example, in the embodiment of the present application, the signal processing chip will generate a 12V voltage signal and transmit the voltage signal to the signal component 6, thereby generating a current of 2A. When the current in the circuit is greater than or equal to 1.5A, it will cause the circuit breaker 100 to cut off the circuit, thus protecting the safety of circuit components and nearby personnel.

[0106] In some other embodiments of the present application, the circuit board 3 can also integrate a controller chip (such as a CPLD) and / or a signal processing chip (such as a DSP chip), etc. The controller chip communicates with the induction chip 31 to receive the signal transmission of the induction chip 31. For example, the situations of integrating chips on the circuit board 3 can be the following several types: First, a Hall sensor chip is separately integrated on the circuit board 3. Second, a Hall sensor chip and a controller chip are integrated on the circuit board 3. Third, a Hall sensor chip and a signal processing chip are integrated on the circuit board 3. Fourth, a Hall sensor chip, a controller chip, and a signal processing chip are integrated on the circuit board 3, etc. But it is not limited to this.

[0107] For example, when a Hall sensor chip, a controller chip, and a signal processing chip are integrated on the circuit board 3 at the same time, the distances between the Hall sensor and the circuit breaker 2, and between the signal processing chip and other components in the circuit breaker 100 such as the signal component 6 are relatively close, which is beneficial to the communication between each chip, and is also beneficial for the controller chip to feedback the fault signal to the signal processing chip in time after receiving it, so as to be more beneficial for the signal processing chip to control the circuit breaker 2.

[0108] According to the control method of the drive system 200 according to the third aspect embodiment of the present invention, it includes the following steps: Obtain the status information of the drive board of the electronic control unit 9; If no IPM fault is reported, continue to detect the status information of the electronic control unit 9; if an IPM fault is reported, obtain the status information of the motor 10; If no second fault is reported, re-obtain the status information of the electronic control unit 9; if a second fault is reported, control the circuit breaker 100 to disconnect.

[0109] The working strategy of the circuit breaker 100 in this application adopts a two - stage triggering mode. That is, the first - stage trigger signal comes from the IPM fault signal of the drive chip. The power module (IPM) integrates various protection mechanisms such as over - current protection, over - heat protection, and short - circuit protection. The IPM fault can be a fault of the power module itself or a fault caused by abnormalities in the motor 10 or the peripheral circuit. During the operation of the motor 10, the power module can monitor parameters such as the current and temperature of the motor 10 in real time. For example, when the motor 10 has abnormal conditions such as overload, short - circuit, over - current, over - temperature, etc., the power module will act quickly. After the drive chip detects the IPM fault, it will feedback the signal to the controller chip of the control board 91. The controller chip communicates with the signal - processing chip, and the signal - processing chip controls the circuit breaker 100 to disconnect the circuit or take other protection measures to prevent the motor 10 and other related devices from being damaged and ensure the safe and stable operation of the entire drive system 200. The second - stage trigger signal is the second fault, which comes from the signal detected by the induction chip 31. When the trigger conditions satisfy both the first - stage trigger condition and the second - stage trigger condition, the drive circuit breaker 100 completely disconnects the circuit to avoid further damage to the vehicle system.

[0110] For example, combined with Figure 7 , the control strategy for triggering the circuit breaker 100 to start protection for the drive system 200. When the drive system 200 is in the working state, first, obtain the status information of the electronic control unit 9 and judge whether there is an IPM fault through the drive chip. For example, phenomena such as too high temperature of the IPM module caused by poor heat dissipation of the motor 10 heat sink, short - circuit phenomena caused by internal short - circuit of the IPM module or damaged external lines, loose circuit components and unstable power supply voltage inside the IPM module, and under - voltage of the drive chip on the drive board will cause the drive chip to report an IPM fault. If the judgment result of the drive chip is negative, it does not meet the condition for triggering the circuit breaker 100 to disconnect, and at this time the system will return to the original condition. If the drive chip reports an IPM fault, it meets the first - stage trigger condition, and at this time it will continue to judge whether the second - stage trigger condition is met, that is, judge whether the current in the power input channel of the motor 10 exceeds the preset current threshold, whether the rotation speed of the motor 10 exceeds the preset rotation speed threshold, etc. through the induction chip 31 (such as a Hall sensor chip). When the induction chip 31 does not detect the phase - current over - current signal, continue to detect other second - stage trigger signals. If none of the set second - stage trigger signals are detected, it does not meet the condition for the circuit breaker 100 to disconnect, and return to the initial condition. When the induction chip 31 detects the phase - current over - current signal of the motor 10 or detects other second - stage trigger signals, it meets the second - stage trigger condition, and at this time trigger the circuit breaker 100 to disconnect. Thus, to avoid false reporting of IPM faults, only when both the first - stage and second - stage trigger conditions are met will the circuit breaker 100 be triggered to disconnect to protect the electronic control unit 9 and the battery pack 201.

[0111] According to some embodiments of the present invention, in combination with Figure 7 , the second fault includes that the current in the power input channel of the motor 10 exceeds a preset current threshold, whether the rotation speed of the motor 10 exceeds a preset rotation speed threshold, whether the temperature of the power input channel of the motor 10 exceeds a preset temperature threshold, or the back electromotive force of the motor 10 is abnormal.

[0112] For example, the circuit breaker 100 is arranged between the power input channel of the motor 10 (i.e., the circuit breaker 2 of the motor 10) and the bridge arm 921. By detecting the temperature or current value of the circuit breaker 100, it can be identified that the current in the power input channel of the motor 10 exceeds the preset current threshold, or the temperature of the power input channel of the motor 10 exceeds the preset current threshold.

[0113] The rotation speed threshold of the motor 10 refers to the upper or lower limit value of the rotation speed that the motor 10 is allowed to reach during normal operation or under specific conditions. Sudden reduction of the load, unreasonable setting of the rotation speed threshold preset in the control system of the motor 10, etc. will cause the rotation speed of the motor 10 to exceed the preset rotation speed threshold. Excessive rotation speed of the motor 10 will increase the centrifugal force of the motor 10, which may cause damage to the mechanical structure of the motor 10 or abnormal heating of the motor 10, affecting the service performance and service life of the motor 10.

[0114] The abnormal back electromotive force of the motor 10 can be understood as follows: during the operation of the motor 10, the back electromotive force generated in its winding deviates from the normal working range. For example, usually, a relatively high back electromotive force will be generated during the operation of the motor 10, and the ASC (Active Stability Control) in the vehicle can consume part of the above-mentioned back electromotive force. However, when the ASC fails to function, at this time, the back electromotive force of the motor 10 may be higher than the output voltage of the battery pack 201 that outputs direct current, and it can be considered that the electromotive force of the motor 10 is abnormal. It should be noted that how much the pressure difference between the back electromotive force of the above-mentioned motor 10 and the output voltage of the battery pack 201 that outputs direct current is determined to be abnormal specifically needs to be judged according to the actually used battery pack 201.

[0115] With such a setting, the second fault not only refers to the phase current signal of the circuit breaker 2, but also can detect whether there is a second fault according to the rotation speed of the motor 10, the temperature of the power input channel of the motor 10, the back electromotive force of the motor 10, etc., enriching the triggering conditions of the second fault and the determination conditions of the secondary trigger, making the control strategy of the drive system 200 more accurate. Of course, the second fault is not limited to this, and other signal detection sensors can also be correspondingly set according to actual use to detect other fault signals.

[0116] When the induction chip 31 on the circuit board 3 of the circuit breaker 100 reports an IPM fault and meets the first-level trigger condition, it is necessary to continue to determine whether it meets the second-level trigger condition. At this time, the second-level trigger determination condition is whether the back electromotive force of the motor 10 is greater than the voltage of the battery pack 201, whether the current in the power input channel of the motor 10 exceeds the preset current threshold, whether the speed of the motor 10 exceeds the preset speed threshold, whether the temperature of the power input channel of the motor 10 exceeds the preset temperature threshold, etc. When the controller chip receives any of the above faults, the second-level trigger condition is satisfied. At this time, the drive system 200 satisfies both the first-level and second-level trigger conditions, triggering the circuit breaker 100 to disconnect, and the connection between the inverter 92 and the motor 10 is disconnected, so that the motor 10 and the battery pack 201 can be protected.

[0117] For example, in some other embodiments of the present application, a temperature sensor chip and a voltage detection chip may also be integrated on the circuit board 3. The temperature sensor chip can be used to detect the temperature at which the breaker 2 operates, and the voltage detection chip can be used to detect the voltage signal flowing through the circuit breaker 100 into the motor 10. When the corresponding chips on the circuit board 3 detect the above over-temperature or over-voltage faults, the second-level trigger condition is satisfied, and the signal processing chip controls the breaker 2 to be cut off, and the circuit breaker 100 is disconnected. That is to say, for the detection of the second fault, it can be detected correspondingly by different chips integrated on the circuit board 3.

[0118] The other components and operations of the circuit breaker 100, the drive system 200 and the control method according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0119] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0121] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A circuit breaker (100), characterized in that: include: Housing (1); A circuit breaker (2), at least a portion of the circuit breaker (2) being arranged in the housing (1); A sensing chip (31), wherein the sensing chip (31) is integrated into the housing (1).

2. The circuit breaker (100) according to claim 1, characterized in that: Also includes: A circuit board (3), the circuit board (3) being arranged in the housing (1), the sensing chip (31) being integrated in the circuit board (3), and the sensing chip (31) detecting a working signal of the circuit breaker (2).

3. The circuit breaker (100) according to claim 2, characterized in that: The side of the circuit board (3) facing the disconnecting element (2) has a shielding element (5).

4. The circuit breaker (100) according to claim 3, characterized in that: The circuit breaker (100) further comprises at least one arc extinguishing element (4), wherein the arc extinguishing element (4) is located between the circuit breaker (2) and the shielding element (5).

5. The circuit breaker (100) according to claim 4, characterized in that: The arc extinguishing member (4) is arranged on the shielding member (5).

6. The circuit breaker (100) according to claim 4, characterized in that: There are a plurality of arc extinguishing members (4), and the plurality of arc extinguishing members (4) are arranged along the length direction of the circuit breaker (2).

7. The circuit breaker (100) according to claim 3, characterized in that: A first ground wire (51) is provided on the shielding element (5).

8. The circuit breaker (100) according to claim 7, characterized in that: One end of the first ground wire (51) passes through the housing (1) and extends to the outside of the housing (1).

9. The circuit breaker (100) according to claim 2, characterized in that: The circuit breaker (2) comprises: a connecting section (20), at least a portion of which passes through the shell (1) and extends out of the shell (1); A flow section (23), the flow section (23) being connected to the connecting section (20), and a cutting groove (231) being formed on the flow section (23).

10. The circuit breaker (100) according to claim 9, characterized in that: The connecting section (20) comprises: a first connecting section (21), one end of the first connecting section (21) passing through the side wall of the shell (1) and extending out of the shell (1), and the other end of the first connecting section (21) being connected to one end of the flow-through section (23); A second connecting section (22), one end of the second connecting section (22) passes through the other side wall of the shell (1) and extends out of the shell (1), and the other end of the second connecting section (22) is connected to the other end of the flow section (23).

11. The circuit breaker (100) according to claim 10, characterized in that: In a direction from the other end of the first connecting section (21) toward the other end of the second connecting section (22), the current flow section (23) first bends and extends toward a side close to the circuit board (3), and then bends and extends toward a side away from the circuit board (3).

12. The circuit breaker (100) according to claim 4, characterized in that: Also includes: A signaling member (6), wherein the signaling member (6) is disposed on the housing (1), and the signaling member (6) is suitable for communicating with a control panel (91).

13. The circuit breaker (100) according to claim 12, characterized in that: There are two signal members (6), the two signal members (6) are respectively a positive signal line and a negative signal line, and the two signal members (6) are suitable for receiving a voltage signal from the control board (91) to trigger the disconnection of the circuit breaker (2).

14. The circuit breaker (100) according to claim 13, characterized in that: Also includes: A combustion chamber (7), the combustion chamber (7) being arranged in the housing (1), the combustion chamber (7) containing fuel (71), and when the voltage on the signal element (6) is greater than or equal to a preset voltage, the fuel (71) is ignited to trigger the disconnection element (2) to be cut off; An inference device (8) is provided between the combustion chamber (7) and the circuit breaker (2), wherein the fuel (71) burns to push the inference device (8) toward the circuit breaker (2) to cut off the circuit breaker (2).

15. The circuit breaker (100) according to claim 14, characterized in that: The fuel (71) comprises: A first fuel (711), wherein the first fuel (711) burns to generate a force acting on the inference device (8) to push the inference device (8) to move toward the circuit breaker (2) to cut off the circuit breaker (2).

16. The circuit breaker (100) according to claim 15, characterized in that: The fuel (71) further comprises: A second fuel (712), wherein the second fuel (712) burns to generate gas to transfer the arc generated by the circuit breaker (2) to the arc extinguishing member (4).

17. The circuit breaker (100) according to claim 1, characterized in that: The sensing chip (31) comprises a Hall sensor chip.

18. The circuit breaker (100) according to any one of claims 2 to 17, characterized in that: The circuit board (3) is also provided with a plurality of conductors (32), and the plurality of conductors (32) at least include a second ground wire, a power wire and a communication wire.

19. The circuit breaker (100) according to claim 18, characterized in that: One end of each of the plurality of wires (32) passes through the housing (1) and extends to the outside of the housing (1).

20. A drive system (200), characterized in that: include: An electric control unit (9), the electric control unit (9) comprising an inverter (92); Motor (10); A circuit breaker (100), wherein the circuit breaker (100) is the circuit breaker (100) according to any one of claims 1 to 19, and the circuit breaker (100) is connected between the inverter (92) and the motor (10).

21. The drive system (200) according to claim 20, characterized in that The inverter (92) comprises three bridge arms (921) connected in parallel; The motor (10) has three power input channels, the three power input channels are respectively connected to the midpoints of the three bridge arms (921), and the circuit breaker (100) is provided between at least two of the three power input channels and the corresponding bridge arms (921).

22. The drive system (200) according to claim 20, characterized in that The electronic control unit (9) further comprises: A control panel (91), wherein the control panel (91) controls the circuit breaker (100) to open.

23. The drive system (200) according to claim 22, characterized in that The electronic control unit (9) further comprises: A drive board, the drive board drives the inverter (92) to work, and a drive chip of the drive board detects an IPM fault.

24. The drive system (200) according to claim 23, characterized in that The control board (91) comprises a controller chip and a signal processing chip, the controller chip communicates with the signal processing chip, the drive chip and the circuit breaker (100) sensing chip (31) respectively, and the signal processing chip communicates with the signal element (6) of the circuit breaker (100).

25. A control method for a drive system (200) according to any one of claims 21-24, characterized in that: The steps include: Obtaining status information of an electronic control unit (9); If no IPM fault is reported, continue to detect the status information of the electronic control unit (9); if an IPM fault is reported, obtain the status information of the motor (10); If the second fault is not reported, the status information of the electric control unit (9) is reacquired; if the second fault is reported, the circuit breaker (100) is controlled to be disconnected.

26. The control method of the drive system (200) according to claim 25, characterized in that: The second fault includes that the current of the power input channel of the motor (10) exceeds a preset current threshold, the speed of the motor (10) exceeds a preset speed threshold, the temperature of the power input channel of the motor (10) exceeds a preset temperature threshold, or the back electromotive force of the motor (10) is abnormal.

Images