Circuit breaker, drive system and control method thereof

Abstract

The application discloses a circuit breaker, a driving system and a control method thereof. The circuit breaker comprises a shell, a circuit breaking part, at least a part of the circuit breaking part is arranged in the shell, and an induction chip is integrated in the shell. According to the circuit breaker, the occupied volume is small, and the space utilization of the whole vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of driving device, in particular to a circuit breaker, a driving system and a control method thereof. BACKGROUND

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

[0003] In the related art, the circuit breaker receives a melting signal of an external sensor by means of an external 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 has a large hardware volume itself, which occupies a certain vehicle space and is not conducive to the integration and functionalization of the automobile assembly. SUMMARY

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

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

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

[0007] The circuit breaker according to the first aspect of the present application comprises a housing, a circuit breaking piece, and a sensing chip, at least a part of the circuit breaking piece is arranged in the housing, and the sensing chip is integrated in the housing.

[0008] The circuit breaker according to the present application integrates the sensing chip in the housing. Compared with a conventional sensor (for example, a Hall sensor) arranged independently, the sensing chip has the function of the conventional sensor and has a small hardware volume itself. Integrating the sensing chip in the existing housing of the circuit breaker is more conducive to the integration of the circuit breaker and improves the space utilization of the vehicle.

[0009] According to some embodiments of the present application, the circuit breaker further comprises a circuit board arranged in the housing, the sensing chip is integrated in the circuit board, and the sensing chip detects a working signal of the circuit breaking piece.

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

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

[0012] According to some embodiments of the present application, the arc extinguishing piece is arranged on the shielding piece.

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

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

[0015] According to some embodiments of the present application, one end of the first ground wire extends out of the shell.

[0016] According to some embodiments of the present application, the circuit breaking member comprises a connecting section, at least part of the connecting section extends out of the shell, and a flow passing section connected to the connecting section, and the flow passing section is provided with a cutting groove.

[0017] According to some embodiments of the present application, the connecting section comprises a first connecting section, one end of the first connecting section extends out of the shell through a side wall of the shell, and the other end of the first connecting section is connected to one end of the flow passing section, and a second connecting section, one end of the second connecting section extends out of the shell through another side wall of the shell, and the other end of the second connecting section is connected to the other end of the flow passing section.

[0018] According to some embodiments of the present application, the flow passing section first bends and extends towards the side close to the circuit board, and then bends and extends towards the side away from the circuit board.

[0019] According to some embodiments of the present application, the circuit breaker further comprises a signal member provided on the shell, and the signal member is adapted to communicate with a control board.

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

[0021] According to some embodiments of the present application, the circuit breaker further comprises a combustion chamber provided in the shell, the combustion chamber has a fuel therein, when the voltage on the signal member is greater than or equal to a preset voltage, the fuel is ignited to trigger the cutting of the circuit breaking member, and a pushing device provided between the combustion chamber and the circuit breaking member, the fuel combustion pushes the pushing device to be movable towards the circuit breaking member to cut the circuit breaking member.

[0022] According to some embodiments of the present application, the fuel comprises: a first fuel, combustion of which generates a force acting on the inference device to push the inference device to move towards the breaking piece to cut off the breaking piece.

[0023] According to some embodiments of the present application, the fuel further comprises: a second fuel, combustion of which generates a gas to transfer an arc generated by the breaking piece to an arc extinguishing piece.

[0024] According to some embodiments of the present application, the sensing chip comprises a Hall sensor chip.

[0025] According to some embodiments of the present application, the circuit board is provided with a plurality of wires, at least including a second ground wire, a power supply wire and a communication wire.

[0026] According to some embodiments of the present application, one end of each of the plurality of wires penetrates through the shell to the outside of the shell.

[0027] According to the driving system of the second aspect of the embodiments of the present application, the driving system comprises: an electric control unit, the electric control unit comprising an inverter; a motor; a breaker, the breaker being the breaker according to the first aspect of the embodiments of the present application, the breaker being connected between the inverter and the motor.

[0028] According to some embodiments of the present application, the inverter comprises three bridge arms in parallel; the motor has three power input channels, each of the three power input channels being connected to a midpoint of each of the three bridge arms, at least two of the three power input channels being provided with the breaker between the corresponding bridge arm.

[0029] According to some embodiments of the present application, the electric control unit further comprises: a control board, the control board controlling the breaking of the breaker.

[0030] According to some embodiments of the present application, the electric control unit further comprises: a driving board, the driving board driving the inverter to work, a driving chip of the driving board detecting an IPM fault.

[0031] According to some embodiments of the present application, the control board comprises a controller chip and a signal processing chip, the controller chip being in communication with the signal processing chip, the driving chip and the breaker sensing chip respectively, and the signal processing chip being in communication with the signal piece of the breaker.

[0032] According to the control method of the driving system of the third aspect of the embodiments of the present application, the control method comprises the following steps:

[0033] Obtaining state information of an electric control unit;

[0034] If the IPM fault is not reported, continue to detect the state information of the electric control unit; if the IPM fault is reported, acquire the state information of the motor;

[0035] If the second fault is not reported, re-acquire the state information of the electric control unit; if the second fault is reported, control the circuit breaker to be opened.

[0036] According to some embodiments of the present application, the second fault includes that the current of the power input channel of the motor exceeds a preset current threshold, whether the rotating speed of the motor exceeds a preset rotating speed threshold, whether the temperature of the power input channel of the motor exceeds a preset temperature threshold, or whether the counter electromotive force of the motor is abnormal.

[0037] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0039] Figure 1 is a schematic diagram of a circuit breaker according to an embodiment of the present application;

[0040] Figure 2 is an exploded view of a circuit breaker according to an embodiment of the present application;

[0041] Figure 3 is a schematic diagram of a shielding member and a circuit board of a circuit breaker according to an embodiment of the present application;

[0042] Figure 4 is an assembly diagram of a circuit breaking member, an arc extinguishing member, a combustion chamber and a push-out device of a circuit breaker according to an embodiment of the present application;

[0043] Figure 5 is a schematic diagram of a circuit breaker according to another embodiment of the present application;

[0044] Figure 6 is a topological circuit structure diagram of a drive system according to an embodiment of the present application;

[0045] Figure 7 is a control strategy flow chart of a drive system according to an embodiment of the present application.

[0046] REFERENCE NUMERALS:

[0047] 100, circuit breaker; 200, drive system; 201, battery pack;

[0048] 1, housing; 11, first housing; 12, second housing;

[0049] 2, circuit breaking member; 20, connecting section; 21, first connecting section; 22, second connecting section;

[0050] 23, overcurrent section; 231, cutting groove;

[0051] 3, circuit board; 31, sensing chip; 32, wire;

[0052] 4, arc extinguishing member; 5, shielding member; 51, first ground wire;

[0053] 6, signal member;

[0054] 7, combustion chamber; 71, fuel; 711, first fuel; 712, second fuel;

[0055] 8, inferring device; 81, inferring structure;

[0056] 9, electronic control unit; 91, control board;

[0057] 92, inverter; 921, bridge arm;

[0058] 10, motor. DETAILED DESCRIPTION

[0059] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary, and the following description refers to the accompanying drawings in which Figures 1-5 A circuit breaker 100 according to an embodiment of the present application is described below.

[0060] The circuit breaker 100 according to the first aspect embodiment of the present application comprises a housing 1, a circuit breaking member 2, and a sensing chip 31.

[0061] In combination with Figure 1 , Figure 2 and Figure 5 , at least a portion of the circuit breaking member 2 is arranged inside the housing 1. The "at least a portion" as described above means that at least a portion of the circuit breaking member 2 is covered inside the housing 1. In this way, the housing 1 can protect the circuit breaking member 2 and prevent the metal sheet inside the circuit breaker 100 from flying out when the circuit breaking member 2 is in working condition. When the circuit breaker 100 is used in the drive system 200 of a vehicle, the two ends of the circuit breaking member 2 are adapted to be connected to the motor 10 and the inverter 92 respectively. For example, in combination with Figure 1 , the right side of the circuit breaking member 2 outside the housing 1 is connected to the inverter 92, and the left side of the circuit breaking member 2 outside the housing 1 is connected to the motor 10. In this way, the motor 10 and the inverter 92 are connected via the two ends of the circuit breaking member 2, and when the drive chip is under voltage, the motor 10 is short-circuited, overcurrent or over-temperature overheating, etc. Working conditions, the circuit breaker 100 can cut off the circuit in time to protect the circuit of the drive system 200.

[0062] In combination with Figure 2The inductive chip 31 is integrated in the shell 1. For example, the inductive chip 31 can be integrated in the internal space of the shell 1. Of course, it can also be integrated at other positions of the shell. For example, the integrated inductive chip 31 can be understood as integrating a large number of transistors, resistors, capacitors and other elements and multiple functional circuits on a tiny chip, reducing the number of components on the circuit breaker 100, greatly reducing the space occupation of the inductive chip 31, and further improving the integration of the inside of the circuit breaker 100, which is conducive to the production, processing, installation and use of the circuit breaker 100.

[0063] According to the circuit breaker 100 of the embodiment of the present application, the motor 10 and the inverter 92 are connected via the circuit breaking piece 2, and when the driving chip under-voltage, motor 10 short circuit, over-current or over-temperature overheating and other working conditions occur, the circuit breaker 100 can timely cut off the circuit to protect the safety of the circuit of the driving system 200. The inductive chip 31 is integrated on the shell 1, compared with the traditional sensor (such as a Hall sensor) arranged independently, the inductive chip 31 (such as a Hall sensor chip) has the function of the traditional sensor (such as a Hall sensor) and has a small hardware volume itself, and integrating it on the existing shell 1 of the circuit breaker 100 is more conducive to the integration of the circuit breaker 100, and improves the space utilization of the whole vehicle.

[0064] Optionally, the inductive chip 31 can be fixed on the shell 1 by welding. The welding can form a metal connection between the inductive chip 31 pin and the shell 1, and the inductive chip 31 fixed by welding can be firmly attached to the shell 1, which can prevent the inductive chip 31 from falling off during long-term operation of the circuit breaker 100.

[0065] According to some embodiments of the present application, in combination with Figure 2 and Figure 3 The circuit breaker 100 further comprises a circuit board 3 arranged in the shell 1, the inductive chip 31 is integrated in the circuit board 3, and the inductive chip 31 detects the working signal of the circuit breaking piece 2.

[0066] In combination with Figure 2The circuit board 3 is disposed within the housing 1. For example, the circuit board 3 can be a PCB. A PCB is a sheet-like material composed of an insulating substrate, conductive patterns, and holes. Through a specific manufacturing process, the electrical connection circuits for various electronic components are printed on the insulating substrate, achieving electrical connections and mechanical fixation between the electronic components. It also provides insulation, isolation, and heat dissipation, ensuring the stability and reliability of the electronic device. Therefore, integrating the sensing chip 31 into the circuit board 3 facilitates the function of the sensing chip 31 and the control of other components by the circuit board 3. Furthermore, the sensing chip 31 is adapted to communicate with the control board 91 of the electronic control unit 9. The sensing chip 31 can detect the current signal flowing through the circuit breaker 2 or other operating signals such as voltage and temperature. When the sensing chip 31 detects a fault (e.g., an overcurrent flowing through the circuit breaker 2 or an overtemperature of the circuit breaker 2), it can quickly transmit a fault signal to the control board 91 of the electronic control unit 9, triggering the next step, disconnecting the circuit breaker 100 and ensuring vehicle safety. In addition, by integrating the sensing chip 31 on the circuit board 3, the sensing chip 31 occupies less space on the circuit board 3, 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 entire vehicle can be improved.

[0067] According to some embodiments of the present invention, Figure 2 and Figure 3 The side of the circuit board 3 facing the disconnecting element 2 has a shielding element 5 .

[0068] Specifically, combined Figure 2 and Figure 3 A shielding member 5 is provided on the upper side of the circuit board 3, near the circuit breaker 2. This arrangement creates capacitive coupling between the various circuit components on the circuit board 3, potentially leading to signal crosstalk and transmission distortion. Placing the shielding member 5 on the upper side of the circuit board 3 reduces capacitive coupling between the circuit breaker 100 and other circuit components, minimizing signal interference and ensuring accurate and stable signal transmission within the circuit. Furthermore, it effectively reduces interference from external electromagnetic signals when the sensor chip 31 is operating in a high-voltage state, ensuring that the sensor chip 31 monitors the operating status of the circuit breaker 2, enabling quick and accurate responses and control of the circuit breaker 2.

[0069] According to some embodiments of the present invention, Figure 2 and Figure 4 The circuit breaker 100 further includes at least one arc extinguishing member 4, which is located between the circuit breaker 2 and the shielding member 5. The above-mentioned "at least one" means that there is at least one arc extinguishing member 4, and may be multiple.

[0070] For example, in Figure 2 In the example of the shielding member 5, in the thickness direction (ieFigure 2 The arc extinguishing member 4 is arranged on the upper side of the circuit breaker 100 in the vertical direction. When the circuit breaker 100 is tripped to cut off the circuit, an arc is generated. The arc extinguishing member 4 is arranged to have good heat conduction performance, so that the arc extinguishing member 4 can quickly absorb the heat of the arc and dissipate the heat, thereby rapidly reducing the temperature of the arc, weakening the energy of the arc, and further extinguishing the arc. In addition, the arc extinguishing member 4 can divide the arc into multiple small arcs, which is conducive to extinguishing the arc. Moreover, the arc extinguishing member 4 can quickly extinguish the arc generated when the circuit is tripped, thereby shortening the time during which the arc exists, protecting the circuit components and making the circuit components quickly return to the normal working state, and improving the working efficiency of the circuit breaker 100.

[0071] In addition, referring to Figure 2 , the arc extinguishing member 4 is arranged inside the housing 1. In this way, the arc extinguishing member 4 is arranged inside the housing 1, so that the internal structure of the circuit breaker 100 is more compact, which is conducive to the integration of the circuit breaker 100 and improves the space utilization of the vehicle. Moreover, the arc generated when the circuit is tripped by the circuit breaker 100 can be effectively limited in the housing 1, so as to avoid the arc from causing harm to the surrounding personnel and equipment, and improve the safety of the circuit breaker 100.

[0072] Referring to Figure 2 , the circuit 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., the vertical direction in Figure 2 , and the arc extinguishing member 4 is located between the circuit breaking member 2 and the shielding member 5. In this way, the internal structure of the circuit breaker 100 is more compact. The arc extinguishing member 4 cooperates with the circuit breaking member 2 and the shielding member 5 to reasonably utilize the space and improve the internal space utilization of the circuit breaker 100. In addition, the shielding member 5 can block the electromagnetic interference generated by the arc from being transmitted outward, and the arc extinguishing member 4 is arranged close to the circuit breaking member 2, which is conducive to extinguishing the arc by the arc extinguishing member 4 and enables the shielding member 5 to better play a role in protecting the surrounding electronic equipment from the electromagnetic interference and improving the stability and reliability of the entire drive system 200.

[0073] According to some embodiments of the present application, in combination with Figure 2 and Figure 4 , the arc extinguishing member 4 is arranged on the shielding member 5. For example, in Figure 2In the 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. The arc extinguishing member 4 is arranged on the shielding member 5 to achieve a better arc guidance effect. When the circuit is blown and an arc is generated, the arc extinguishing member 4 is arranged on the shielding member 5 to achieve the effect of guiding the arc to move upward, which can effectively increase the contact area and heat dissipation effect between the arc and the surrounding medium, and accelerate the cooling and extinction of the arc. In addition, the generation and extinction process of the arc will be accompanied by the release of electromagnetic energy, which may cause electromagnetic interference to surrounding electronic equipment and communication lines. Therefore, 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, reduce interference with the surrounding electromagnetic environment, and ensure the normal operation of other circuit breakers 100.

[0074] According to some embodiments of the present invention, 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 circuit breaker 2. In the description of the present invention, the meaning of "multiple" is two or more.

[0075] For example, in Figure 2 In the 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 circuit breaker 2 (for example, Figure 2 ) on both sides of the circuit breaker 2 (in the direction indicated by the arrow A). Thus, the two arc extinguishing members 4 are arranged along the length of the circuit breaker 2, which can fully utilize the lateral space and make the internal structure of the circuit breaker 100 more compact, thereby improving the integration of the circuit breaker 100 and facilitating the integrated development of the circuit breaker 100. Moreover, this arrangement can accommodate more arc extinguishing components, such as the arc extinguishing members 4, within a limited space, thereby improving the arc extinguishing efficiency. Furthermore, it is also conducive to forming a more 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 actual conditions to better meet practical applications.

[0076] According to some embodiments of the present invention, Figure 2 and Figure 4 Each arc extinguishing member 4 includes quartz sand, a fuse or a plurality of stacked conductive sheets.

[0077] For example, quartz sand has excellent insulation properties and high thermal conductivity. When an arc occurs within the circuit breaker 100, the quartz sand can quickly absorb the heat generated by the arc, reducing the arc temperature, accelerating the cooling and extinction of the arc, and effectively improving arc extinguishing efficiency. Furthermore, the quartz sand can form a physical barrier, preventing splashes generated during the arc combustion process from damaging surrounding equipment and circuits. Therefore, the quartz sand contained in the arc extinguishing element 4 can absorb the heat of the arc, accelerate the extinction and cooling of the arc, and control the arc within a certain spatial range, preventing splashing and improving circuit safety.

[0078] A fuse is usually a thin metal wire or strip that melts when an electric current through it exceeds its rating, thereby breaking the circuit and protecting the electrical devices in the circuit from damage due to overcurrent.

[0079] When an arc occurs in the circuit, the arc forms multiple small segments between the different conductive pieces, increasing the length of the arc. According to the volt-ampere characteristic of the arc, the arc voltage increases after the arc lengthens, making it more difficult to maintain the arc, thereby accelerating the extinction of the arc. The conductive pieces absorb the heat of the arc during the arc burning process, and multiple stacked conductive pieces can provide a larger heat dissipation area to accelerate the dissipation of the arc heat, rapidly reducing the temperature of the arc. When the temperature of the arc decreases to a certain extent, the plasma in the arc rapidly recombines, thereby achieving arc extinction. In addition, the arc-extinguishing piece 4 formed by stacking multiple conductive pieces has a more stable overall structure and is less likely to deform or be damaged, ensuring the normal operation of the arc-extinguishing piece 4.

[0080] According to some embodiments of the present application, in combination Figure 1 A first ground wire 51 is provided on the shielding piece 5.

[0081] For example, the first ground wire 51 is led out on the shielding piece 5, and multiple small arcs generated during arc extinction of the arc-extinguishing piece 4 can be grounded through the first ground wire 51. The first ground wire 51 is connected to the ground, which can shield and discharge electromagnetic energy, reduce the influence of electromagnetic interference generated during arc extinction on surrounding electrical equipment and signal transmission, and weaken the generated arc, 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 first ground wire 51 can also shield the interference of electromagnetic signals.

[0082] According to some embodiments of the present application, in combination Figure 1 One end of the first ground wire 51 extends through the housing 1 to the outside of the housing 1. For example, in combination Figure 1 The first ground wire 51 extends through the housing 1 to the outside of the housing 1 and is 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 piece 4 can maintain equipotential with the ground in normal or fault state. When there is current to pass through the shielding piece 5, since the potential of the ground is zero and the capacity is infinite, the current will preferentially flow into the ground through the first ground wire 51, rather than through the human body or the circuit breaker 100, thereby achieving protection and auxiliary arc extinction functions, which can effectively ensure the safety of the human body or the circuit breaker 100.

[0083] According to some embodiments of the present application, in combination Figure 1 and Figure 4The circuit breaking member 2 comprises a connecting section 20 and a flow passing section 23. Specifically, at least part of the connecting section 20 extends outside the housing 1 through the side walls of the housing 1. The flow passing section 23 is connected to the connecting section 20, and the flow passing section 23 is formed with a cutting groove 231.

[0084] For example, in the example of Figure 2 and Figure 4 , the circuit breaking member 2 is composed of the connecting section 20 and the flow passing section 23. In this example, the connecting section 20 extends left and right along the length direction of the circuit breaker 100 (for example, the direction indicated by arrow A in Figure 2 ), and at least part of the connecting section 20 extends outside the housing 1 through the left and right side walls of the housing 1, while the flow passing section 23 is entirely covered inside the housing 1. In this way, the left and right ends of the connecting section 20 can extend outside the housing 1 through the left and right side walls of the housing 1, respectively, so as to be connected to the motor 10 and the inverter 92, respectively. In addition, the flow passing section 23 is entirely covered inside the housing 1, which can prevent the parts from splashing when the circuit breaker 100 cuts off the circuit, and protect the circuit elements inside and near the circuit breaker 100 from being damaged. Moreover, the connecting section 20 and the flow passing section 23 have simple structures, which reduces the processing difficulty of the circuit breaking member 2, and is conducive to the mass production of the circuit breaking member 2, and improves the production efficiency.

[0085] In addition, the flow passing section 23 is formed with the cutting groove 231, and the circuit breaking member 2 is cut off at the cutting groove 231 to cut off the circuit connection between the inverter 92 and the motor 10. When the two signal members 6 receive the voltage signal from the signal processing chip, the two signal members 6 will generate current to ignite the fuel 71 in the combustion chamber 7, and the energy and pressure generated by the combustion of the fuel 71 will rapidly drive the pushing device 8 to move, so that the circuit breaking member 2 is cut off at the bottom of the cutting groove 231, thereby cutting off the circuit and achieving the protection effect on the circuit. In addition, the cutting groove 231 is in close contact with the pushing device 8, so that the position of the circuit breaking member 2 being cut off is more accurate. Moreover, the cutting groove 231 has a simple structure, which simplifies the structure of the circuit breaking member 2, reduces the production difficulty, and further improves the production efficiency.

[0086] According to some embodiments of the present application, in combination with Figure 1 and Figure 4 , the connecting section 20 comprises a first connecting section 21 and a second connecting section 22. Specifically, one end of the first connecting section 21 extends outside the housing 1 through the side wall of the housing 1, and the other end of the first connecting section 21 is connected to one end of the flow passing section 23. One end of the second connecting section 22 extends outside the housing 1 through the other side wall of the housing 1, and the other end of the second connecting section 22 is connected to the other end of the flow passing section 23.

[0087] For example, in combination with Figure 4 , the first connecting section 21 and the second connecting section 22 both extend along the horizontal direction (for example, Figure 2The first connecting section 21 and the second connecting section 22 extend in the direction indicated by the arrow A, and the mutually distal ends of the first connecting section 21 and the second connecting section 22 respectively extend through the side walls of the left and right sides of the shell 1 to the outside of the shell 1. The aforementioned one end of the first connecting section 21 is adapted to be connected to the inverter 92, and the aforementioned one end of the second connecting section 22 is adapted to be connected to the motor 10, and the aforementioned other end of the first connecting section 21 and the second connecting section 22 is connected to the overcurrent section 23.

[0088] Thus, the first connecting section 21 and the second connecting section 22 respectively extend through the shell 1 to the outside of the shell 1 to be respectively connected to the motor 10 and the inverter 92. In addition, the one end of the first connecting section 21 and the second connecting section 22 inside the shell 1 is respectively connected to the overcurrent section 23, thereby forming a complete circuit breaking piece 2. Moreover, the first connecting section 21, the second connecting section 22 and the overcurrent section 23 have simple structures, which reduces the processing difficulty of the circuit breaking piece 2, is conducive to batch production and processing of the circuit breaking piece 2, and improves production efficiency.

[0089] According to some embodiments of the present application, in combination Figure 2 and Figure 4 , the overcurrent section 23 first bends and extends towards the side close to the circuit board 3, and then bends and extends towards the side away from the circuit board 3 from the direction of the other end of the first connecting section 21 towards the other end of the second connecting section 22.

[0090] For example, in the example of Figure 2 and Figure 4 , the circuit breaking piece 2 has a shape of two flat sides and a concave middle, and the overcurrent section 23 can be provided in a semicircular structure. That is, the first connecting section 21 and the second connecting section 22 are flat plates, and the overcurrent section 23 protrudes towards the side of the circuit board 3, i.e. the lower side in the height direction of the circuit breaker 100. In this way, the concave area of the circuit breaking piece 2 can be provided with other components of the circuit breaker 100, such as the combustion chamber 7 and the tripping device 8, to facilitate the tripping device 8 to cut off the cutting groove 231, and also facilitate the use of space inside the shell 1, and the arrangement of the components inside the shell 1 is more compact.

[0091] According to some embodiments of the present application, in combination Figure 1 and Figure 2 , the circuit breaker 100 further comprises a signal piece 6 provided on the shell 1, and the signal piece 6 is adapted to communicate with the control board 91. For example, in combination Figure 1 and Figure 2 , the signal piece 6 is provided at the upper end in the height direction of the shell 1 and extends to the outside of the shell 1. The signal piece 6 can be used to receive the voltage signal transmitted by the signal processing chip on the control board 91 to control the circuit breaking piece 2 to be disconnected, thereby protecting the motor 10 or the inverter 92 from being damaged by short-circuit current or arc.

[0092] According to some embodiments of the present application, in combination Figure 1 andFigure 2 The two signal pieces 6 are positive and negative signal lines, which are adapted to receive voltage signals from the control board 91 to trigger the cutting-off of the circuit breaker 2. In other words, the two signal pieces 6 can be regarded as positive and negative poles in the circuit, which are used to receive voltage signals transmitted from a signal processing chip on the control board 91.

[0093] 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 an IPM fault signal (i.e. the first fault) fed back from the driving chip on the driving board, and the current of the power input channel of the motor 10 exceeds the preset current threshold, the rotating speed of the motor 10 exceeds the preset rotating speed threshold, the temperature of the power input channel of the motor 10 exceeds the preset temperature threshold, or the counter electromotive force of the motor 10 is abnormal (i.e. the second fault), 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 pieces 6. According to Ohm's law, at this time, there is a current of 2A in the signal piece 6. When the current in the signal piece 6 is greater than or equal to 1.5A, the fuel 71 in the combustion chamber 7 will be ignited, and the fuel 71 will burn to generate a force to push the pushing device 8 towards the circuit breaker 2 to cut off the circuit breaker 2 (e.g. a three-phase copper bar) to cut off the circuit, thereby protecting the circuit elements and the nearby operators.

[0094] According to some embodiments of the present application, in combination with Figure 2 and Figure 4 The circuit breaker 100 further comprises a combustion chamber 7 and a pushing device 8. Specifically, the combustion chamber 7 is arranged in the housing 1, and the combustion chamber 7 has fuel 71 therein. When the voltage on the signal piece 6 is greater than or equal to a preset voltage, the fuel 71 is ignited to trigger the cutting-off of the circuit breaker 2. The pushing device 8 is arranged between the combustion chamber 7 and the circuit breaker 2, and the fuel 71 burns to push the pushing device 8 towards the circuit breaker 2 to cut off the circuit breaker 2.

[0095] For example, in the example of Figure 2 The combustion chamber 7 and the pushing device 8 are arranged in the housing 1, and the combustion chamber 7 and the pushing device 8 are arranged above the overcurrent section 23. The pushing device 8 is opposite to the cutting groove 231. In addition, the pushing device 8 is opposite to the cutting groove 231. The combustion chamber 7 is mainly used to provide a reaction environment for the ignition of the fuel 71. The lower ends of the two signal pieces 6 extend into the combustion chamber 7, and the fuel 71 is placed in the combustion chamber 7.

[0096] For example, when the two signal pieces 6 receive the voltage signal of the signal processing chip, the two signal pieces 6 are electrified to generate current. When the current generated by the two signal pieces 6 is greater than or equal to a preset current, for example, the preset current is 1.5A, and the current on the two signal pieces 6 is greater than or equal to 1.5A, 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 large pressure and impact force can be generated to push the inference device 8 to move in a short time, so as to make the components (such as the circuit breaking piece 2) connected to the circuit break, thereby quickly cutting off the main circuit of the power system, avoiding the existence of short-circuit current, preventing the battery from overheating, fire, and even explosion and other more serious safety accidents. In addition, a strong electric arc will be generated at the moment when the circuit is cut off, 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, and make the electric arc extinguish faster, thereby improving the service life and reliability of the circuit breaker 100.

[0097] In addition, the inference device 8 is arranged between the combustion chamber 7 and the circuit breaking piece 2, and the inference device 8 can move to be close to the circuit breaking piece 2 and fit the cutting groove 231 of the circuit breaking piece 2. Therefore, the cutting of the inference device 8 is more accurate, which is more conducive to cutting off the circuit breaking piece 2. Figure 4 In addition, the inference device 8 is arranged between the combustion chamber 7 and the circuit breaking piece 2, and the inference device 8 can move to be close to the circuit breaking piece 2 and fit the cutting groove 231 of the circuit breaking piece 2. Therefore, the cutting of the inference device 8 is more accurate, which is more conducive to cutting off the circuit breaking piece 2.

[0098] According to some embodiments of the present application, in combination with 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 to move towards the circuit breaking piece 2 to cut off the circuit breaking piece 2.

[0099] According to some embodiments of the present application, in combination with Figure 2 The fuel 71 in the combustion chamber 7 includes a first fuel 711. The first fuel 711 is ignited to rapidly react and explode to generate a strong thrust to push the inference device 8 to move downward to cut off the circuit breaking piece 2, so as to quickly cut off the circuit of the driving system 200. The first fuel 711 provides a main energy source for the entire circuit cutting action, and the energy generated by the combustion of the first fuel 711 acts on the inference device 8 to make the inference device 8 move downward, so as to achieve a fast and accurate circuit cutting effect.

[0100] According to some embodiments of the present application, in combination Figure 2 and Figure 4 , the fuel 71 further comprises a second fuel 712, which burns to generate gas to transfer the arc generated by the breaking of the circuit breaker 2 to the arc extinguishing member 4. Referring to Figure 2 , the fuel 71 in the combustion chamber 7 further comprises a second fuel 712. A large arc will be generated when the high-voltage circuit is cut off, and the second fuel 712 will generate gas during the reaction. The generated gas can cool the arc and mix the plasma of the arc with the surrounding air, transfer the arc to the arc extinguishing member 4 through electromagnetic interaction, and further decompose the arc into multiple series of arcs, i.e., into arcs with smaller voltages, thereby achieving the effect of extinguishing the arc and reducing the damage of the arc to the circuit and surrounding components.

[0101] According to some embodiments of the present application, in combination Figure 3 , the sensing chip 31 comprises a Hall sensor chip.

[0102] For example, a Hall sensor is a sensor that measures physical quantities such as magnetic fields, currents, displacements, etc. using the Hall effect. The Hall sensor does not need to be in direct contact with the measured object, and can detect changes in the magnetic field, respond quickly to changes in the magnetic field, and provide high measurement accuracy.

[0103] In this application, the sensing 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 integration of components 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 and the occupied space of the circuit board 3. Due to the small size and relatively small number of pins of the Hall sensor chip, the Hall sensor chip can be stably 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 the production efficiency. When current passes through the circuit breaker 100, a corresponding magnetic field is generated, which acts on the Hall sensor chip to generate a Hall voltage. By detecting the size of the Hall voltage, the size of the current passing through the circuit breaker 100 can be indirectly measured. When the current flowing through the circuit breaker 2 exceeds the preset current threshold (i.e., when the phase current is overcurrent), the signal can be fed back to the control board 91 to control the breaking of the circuit breaker 2.

[0104] In this way, by fixing the Hall sensor chip on the circuit board 3 through welding, the sensing chip 31 has the function of the Hall sensor while effectively reducing the space occupied by the Hall sensor in the circuit breaker 100, which is conducive to the integration of the circuit breaker 100 and thus the integration and functionalization of the electric vehicle assembly. In addition, the integration of the Hall sensor chip further improves its anti-interference capability, thereby ensuring the reliability and detection sensitivity of its measurement results.

[0105] In some 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 circuit breaking member 2 works, 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 the voltage threshold, the temperature sensor chip and the voltage detection chip will transmit signals to the controller chip, thereby triggering the circuit breaker 100 to cut off the circuit and protect the circuit. It should be noted that the types of chips included in the sensing chip 31 can be set according to actual conditions, which are not limited here.

[0106] According to some embodiments of the present application, in combination with Figure 1 and Figure 3 , the circuit board 3 is provided with a plurality of wires 32, at least including a second ground wire, a power supply wire and a communication wire. Specifically, the second ground wire is mainly used for 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 live. At this time, the second ground wire can introduce current into the ground to avoid electric shock accidents when operating personnel come into contact with the circuit breaker 100. At the same time, the second ground wire can also shield interference, reduce the influence of external electromagnetic interference on the circuit, and improve the stability and reliability of the circuit. The power supply wire mainly functions to transmit voltage and provide power to the circuit. It carries high-potential current output from the power supply (such as a transformer, a generator, etc.) to deliver 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.

[0107] According to some embodiments of the present application, in combination with Figure 1 and Figure 3 , one end of each of the plurality of wires 32 extends to the outside of the housing 1 through the housing 1. In combination with Figure 1 and Figure 3The plurality of wires 32 are arranged near the edge of the circuit board 3, and one end of each of the plurality of wires 32 extends through the shell 1 to the outside of the shell 1. In this way, the plurality of wires 32 extend through the shell 1 to the outside of the shell 1, and the second ground wire extends to the outside and is connected to a dedicated grounding device, so that when a fault such as a leakage occurs in the circuit board 3, the current can quickly flow into the ground through the second ground wire, thereby protecting the equipment and personnel. In addition, the shielding effect of the shell can also be used to reduce the interference of external electromagnetic fields on the communication line, ensuring the stability and reliability of communication.

[0108] According to some embodiments of the present application, the circuit breaking member 2 comprises a copper bar or an aluminum bar.

[0109] For example, the circuit breaking member 2 is a three-phase copper bar. Copper has good electrical conductivity, and a large number of free-moving electrons exist inside it. When the circuit is turned on, these free electrons move directionally under the action of the electric field to form a current, so that the copper bar can transmit the current from one end of the circuit to the other end, realizing the transmission 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 bar has good electrical conductivity and mechanical strength, and can withstand the electric power and heat generated by the short circuit current for a short time without being damaged immediately, giving the circuit breaker 100 time to cut off the circuit.

[0110] Aluminum can easily form a dense layer of aluminum oxide film in the air, which can protect the inside of the aluminum bar from corrosion by the external environment, and has good corrosion resistance. In some harsh working environments, such as humid and chemically corrosive gas environments, the aluminum bar can maintain good electrical and mechanical properties, thereby prolonging the service life of the circuit breaker 100. In addition, aluminum has a smaller density and good processing performance. When the aluminum bar is used as the circuit 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 low compared to copper, and using an aluminum bar as the circuit breaking member 2 can reduce the manufacturing cost of the circuit breaker 100.

[0111] Preferably, since the conductive performance of the aluminum bar is lower than that of the copper bar, the overcurrent capacity of the copper bar is more conducive to transmitting current and reducing power loss due to the aluminum bar. For example, in the protection of the motor 10, one end of the copper bar is fixed by bolt connection at one end of the inverter 92, and the other end is fixed at the output end of the inverter 92, forming a complete circuit path. When a short circuit or other fault occurs in the motor 10 or the inverter 92, the circuit breaker 100 quickly works to push the cutting device 8 to cut the copper bar, thereby cutting off the circuit, ensuring the safety of the circuit system. In addition, the thickness and surface area of the copper bar have a greater impact on its overcurrent capacity. According to Ohm's law, under the condition that other conditions remain unchanged, the resistance will decrease as the thickness of the copper bar increases and the cross-sectional area increases. As can be seen from Ohm's law, under the condition that 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, in the case of heat generated by the current passing through the copper bar, the larger the surface area, the better the heat dissipation effect, the more heat that can be dissipated, and the smaller the temperature rise of the copper bar. The smaller the temperature rise, the greater the current that the copper bar can pass within the allowable operating temperature range. That is, 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 working conditions.

[0112] In combination Figure 1 The shell 1 can be provided as a plastic shell, and the shell 1 includes a first shell 11 and a second shell 12 connected together. The circuit board 3 is connected to the bottom of the second shell 12, and the lower side of the first shell 11 is connected to the top of the second shell 12. The circuit board 3, the first shell 11 and the second shell 12 together define an internal space for mounting the combustion chamber 7, the cutting device 8 and the like. The first shell 11 is in the shape of a cylinder, and the diameter and height of the cylinder can be set according to the requirements in actual applications. The second shell 12 is in the shape of a cuboid or a square, and the length, width and height of the cuboid can be set according to actual conditions.

[0113] Thus, the shell 1 can cover the internal parts of the circuit breaker 100, providing good protection for the internal parts of the circuit breaker 100 and preventing the internal parts of the circuit breaker 100 from splashing. The first shell 11 and the second shell 12 are respectively in the shape of a cylinder and a cuboid, and the shell 1 is regular in shape and low in molding difficulty, effectively reducing the overall molding difficulty of the circuit breaker 100. In addition, the shell 1 is made of plastic, which makes the processing cost of the shell 1 lower, thereby effectively controlling the processing cost of the circuit breaker 100. Moreover, the plastic shell 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 precision of the shell 1 is also improved, and the circuit breaker 100 is convenient to install at different positions.

[0114] In some embodiments, the sensing chip 31 (for example, a Hall sensing chip or the like) can be integrated on the circuit board 3 inside the circuit breaker 100. The volume of the sensing 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 improve the space utilization of the whole vehicle. In addition, the distance between the circuit board 3 and the circuit breaker 2 is short, which can effectively shorten the signal transmission path, effectively reduce the interference and attenuation in the signal transmission process, and ensure the accuracy and stability of the detection signal, so that the sensing chip 31 can quickly and accurately detect the signal of the circuit breaker 2, and the circuit breaker 100 can quickly and accurately detect the fault and act to cut off the circuit breaker 100 in time. Further, other functions of the sensing chip 31 can be linked with the controller of the motor 10.

[0115] According to the second aspect of the present application, the driving system 200 is combined with Figure 6 , which 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 according to the circuit breaker 100 in the above-mentioned first aspect of the embodiment, and the circuit breaker 100 is connected between the inverter 92 and the motor 10, and the control board 91 controls the disconnection of the circuit breaker 100.

[0116] Specifically, the driving system 200 includes an electronic control unit 9, a motor 10 and a circuit breaker 100, and the inverter 92 of the electronic control unit 9 and the motor 10 are provided with the circuit breaker 100, which acts 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, the signal piece 6 of the circuit breaker 100 receives the voltage signal of the signal processing chip of the control board 91 to generate a current, thereby igniting the fuel 71 in the combustion chamber 7, pushing the breaking device 8 to move towards the circuit breaker 2 to cut off the circuit breaker 2, and the circuit breaker 100 is disconnected, thereby protecting the circuit elements and the safety of the nearby operators.

[0117] According to the second aspect of the present application, the driving system 200 is combined with

[0118] According to some embodiments of the present application, combined with Figure 6The inverter 92 includes three bridge arms 921 in parallel, the motor 10 has three power input channels, the three power input channels are connected to the midpoints of the three bridge arms 921 respectively, the three power input channels are connected to the three bridge arms 921 respectively, and at least two of the three power input channels are provided with the circuit breaker 100 between the corresponding bridge arms 921.

[0119] In combination Figure 6 , the inverter 92 in the electric control unit 9 in the present application is a three-phase inverter. The inverter 92 mainly includes a direct current power supply, a power switching device, a control circuit, a filter circuit and the like. The inverter 92 includes three bridge arms 921 (as shown in Figure 6 , the three bridge arms 921 are composed of three groups of upper and lower bridge arms Q1-Q6). The inverter 92 can provide constant power output, so that the motor 10 and the like can run smoothly. The inverter 92 contains six power switching devices, which are two by two, corresponding to the three bridge arms 921 of the three-phase power. By controlling the on and off states of the six power switching devices, the conversion from direct current to three-phase alternating current can be realized.

[0120] The motor 10 has three power input channels, the three power input channels are connected to the midpoints of the three bridge arms 921 one by one, and at least two of the three power input channels are provided with the circuit breaker 100 between the corresponding bridge arms 921. Therefore, by arranging the circuit breaker 100 in at least two channels, it is not necessary to connect each bridge arm 921 to the circuit breaker 100, and only two circuit breakers 100 can cut off the electrical connection between the inverter 92 and the motor 10, so that the circuit design is simpler, and the number of circuit breakers 100 is also reduced.

[0121] Specifically, in combination 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 filters the direct current to obtain smoother direct current. The inverter 92 inverts the direct current into alternating current, and finally outputs to the motor 10 through the circuit breaker 100 to drive the motor 10 to work. Two bridge arms 921 between the motor 10 and the inverter 92 are connected to one circuit breaker 100 respectively, when the control panel 91 receives the first fault and the second fault, the control panel 91 drives the circuit breaker 100 to cut off the circuit in time, at this time the alternating current cannot form a closed loop, avoiding the back electromotive force from being back-irrigated to the inverter 92, ensuring that the automobile can be safely and smoothly parked when the inverter 92 fails. For example, the circuit breaker 100 is applied to the protection of the battery pack 201 of the electric vehicle, in combination with the control strategy of the inverter 92, the circuit breaker 100 is triggered to quickly disconnect any two bridge arms 921 in the inverter 92, further improving the safety and reliability of the electric vehicle.

[0122] According to some embodiments of the present application, in combination Figure 6 The control panel 91 is the core component of the electric control unit 9, which can be used to receive signals from various sensors of the vehicle, such as temperature, pressure, speed, position, etc., and convert these analog signals into digital signals, and process and analyze them, so as to realize accurate control of various parts of the vehicle. For example, when the control panel 91 receives a fault signal, the control panel 91 can transmit a voltage signal to the circuit breaker 100 to control the circuit breaker 100 to open, so as to ensure the safety of the circuit.

[0123] According to some embodiments of the present application, the electric control unit 9 further comprises a drive panel, which drives the inverter 92 to work, and the drive chip of the drive panel detects IPM faults. For example, the drive panel 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 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, overtemperature and overheating, the power module will act quickly, and after the drive chip detects the IPM fault, it will feedback the signal to the controller chip of the control panel 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 equipment from being damaged, and to ensure the safe and stable operation of the entire drive system 200. Thus, the drive chip can detect the IPM fault signal in time, which is conducive to the control of the work of the circuit breaker 100.

[0124] According to some embodiments of the present application, the control panel 91 comprises a controller chip and a signal processing chip, the controller chip communicates with the signal processing chip, the drive chip and the sensing chip 31 of the circuit breaker 100 respectively, and the signal processing chip communicates with the signal piece 6 of the circuit breaker 100.

[0125] For example, the controller chip is the core of the vehicle electric control unit 9, which communicates with other control units such as the signal processing chip, the drive chip and the sensing chip 31 of the circuit breaker 100 at high speed, realizes information sharing and cooperative work between modules. For example, when the vehicle starts, the controller chip communicates with the signal processing chip, the drive chip and the sensing chip 31 of the circuit breaker 100, etc., to obtain the state information of the vehicle, so as to ensure that the vehicle is in a safe driving state. That is, the controller chip can accept various fault signals fed back by the drive chip and the sensing chip 31, and transmit the signals to the signal processing chip, and the signal processing chip outputs a voltage signal to open the circuit breaker 100. For example, the controller chip can be a CPLD chip.

[0126] The signal processing chip is a microprocessor chip specially used for digital signal processing. When an abnormal condition such as overload, overheating, short circuit, etc. of the motor 10 occurs, the signal processing chip controls the work of other components, for example, controls the disconnection of the circuit breaker 100, to ensure the safe operation of the vehicle. For example, the signal processing chip can be set as a DSP chip.

[0127] When a fault occurs in the circuit of the driving system, for example, a driving chip under-voltage, a motor 10 over-temperature or over-current, etc. fault, a 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 generates a 12V voltage signal, and transmits the voltage signal to the signal piece 6, thereby generating a current of 2A. When the current in the circuit is greater than or equal to 1.5A, the circuit breaker 100 will be cut off, thereby protecting the circuit components and the safety of the nearby personnel.

[0128] 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 inductive chip 31 to receive the signal transmission of the inductive chip 31. For example, the integrated chip on the circuit board 3 can be as follows: first, the circuit board 3 integrates a Hall sensor chip alone. Second, the circuit board 3 integrates a Hall sensor chip and a controller chip. Third, the circuit board 3 integrates a Hall sensor chip and a signal processing chip. Fourth, the circuit board 3 integrates a Hall sensor chip, a controller chip and a signal processing chip, etc. But not limited to this.

[0129] For example, when the circuit board 3 simultaneously integrates a Hall sensor chip, a controller chip and a signal processing chip, the distance between the Hall sensor and the circuit breaker 2, and the distance between the signal processing chip and other components in the circuit breaker 100 such as the signal piece 6 are relatively short, which is conducive to the communication between the chips, and also conducive to the controller chip receiving the fault signal and timely feeding back to the signal processing chip, thereby being more conducive to the control of the signal processing chip to the circuit breaker 2.

[0130] The control method of the driving system 200 according to the third aspect embodiment of the present application comprises the following steps:

[0131] Obtaining the state information of the driving board of the electronic control unit 9;

[0132] If no IPM fault is reported, continue to detect the state information of the electronic control unit 9; if the IPM fault is reported, obtain the state information of the motor 10;

[0133] If the second fault is not reported, the status information of the electronic control unit 9 is reacquired; if the second fault is reported, the circuit breaker 100 is controlled to be disconnected.

[0134] The working strategy of the circuit breaker 100 in the present application adopts a two-stage triggering mode, that is, the first-stage triggering signal comes from the IPM fault signal of the driving chip. The power module (IPM) integrates various protection mechanisms such as overcurrent protection, overheat protection, short circuit protection, etc. The IPM fault can be a power module self-fault or a fault caused by abnormality of the motor 10 or the peripheral circuit. In the process of running of the motor 10, the power module can monitor the parameters such as the current and temperature of the motor 10 in real time. For example, when the motor 10 appears abnormal conditions such as overload, short circuit, overcurrent, overtemperature and overheating, the power module will act quickly, the driving chip detects the IPM fault, and then feeds back the signal to the controller chip of the control board 91, the controller chip communicates with the signal processing chip, the signal processing chip controls the circuit breaker 100 to be disconnected to cut off the circuit or takes other protection measures, so as to prevent the motor 10 and other related equipment from being damaged, and to ensure the safe and stable operation of the whole driving system 200. The second-stage triggering signal is the second fault, which comes from the signal detected by the inductive chip 31. When the triggering conditions of the first-stage triggering condition and the second-stage triggering condition are met at the same time, the driving circuit breaker 100 completely disconnects the circuit, so as to avoid further damage to the whole vehicle system.

[0135] For example, in combination with Figure 7, the control strategy for triggering the circuit breaker 100 to open protection of the driving system 200. When the driving system 200 is in a working state, first, the state information of the electronic control unit 9 is acquired, and it is judged by the driving chip whether IPM failure is reported. For example, IPM module temperature too high caused by poor heat dissipation of the motor 10 heat dissipation fin, short circuit phenomenon caused by internal short circuit of the IPM module or external line damage, internal circuit element loosening of the IPM module, and unstable power supply voltage, and under-voltage of the driving chip on the driving board will cause the driving chip to report IPM failure. If the driving chip judgment result is no, the condition for triggering the circuit breaker 100 to open is not met, at this time the system will return to the original condition. If the driving chip reports IPM failure, the first level triggering condition is met, at this time it is continued to be judged whether the second level triggering condition is met, that is, the current of the power input channel of the motor 10 exceeds the preset current threshold, whether the rotating speed of the motor 10 exceeds the preset rotating speed threshold, and the like are judged by the sensing chip 31 (for example, a Hall sensor chip). When the sensing chip 31 does not detect the phase current overcurrent signal, other second level triggering signals are continued to be detected, if none of the set second level triggering signals is detected, the condition for triggering the circuit breaker 100 to open is not met, and the initial condition is returned. When the sensing chip 31 detects the phase current overcurrent signal of the motor 10 or detects other second level triggering signals, the second level triggering condition is met, at this time the circuit breaker 100 is triggered to open. Thus, in order to avoid IPM false failure, only when the first and second level triggering conditions are met, the circuit breaker 100 is triggered to open to protect the electronic control unit 9 and the battery pack 201.

[0136] According to some embodiments of the present application, in combination Figure 7 , the second failure includes that the current of the power input channel of the motor 10 exceeds a preset current threshold, whether the rotating speed of the motor 10 exceeds a preset rotating speed threshold, whether the temperature of the power input channel of the motor 10 exceeds a preset temperature threshold, or abnormal back electromotive force of the motor 10.

[0137] For example, the circuit breaker 100 is arranged between the power input channel of the motor 10 (i.e., the circuit breaking piece 2 of the motor 10) and the bridge arm 921, and the current of the power input channel of the motor 10 exceeding the preset current threshold or the temperature of the power input channel of the motor 10 exceeding the preset current threshold can be identified by detecting the temperature or current value of the circuit breaker 100.

[0138] The motor 10 rotating speed threshold refers to the upper limit or lower limit value of the rotating speed that the motor 10 is allowed to reach under normal operation or specific conditions. Sudden load reduction, unreasonable preset rotating speed threshold setting in the motor 10 control system, and the like can cause the rotating speed of the motor 10 to exceed the preset rotating speed threshold. Too high motor 10 rotating speed can increase the centrifugal force of the motor 10, which can cause damage to the mechanical structure of the motor 10 or abnormal heating of the motor 10, affecting the use performance and service life of the motor 10.

[0139] The back electromotive force anomaly of the motor 10 can be understood as follows: during operation of the motor 10, the back electromotive force generated in the winding of the motor 10 deviates from the normal working range. For example, under normal circumstances, a relatively high back electromotive force is generated during operation of the motor 10, and the ASC (Active Stability Control) in the vehicle can consume part of the back electromotive force. However, when the ASC does not work, the back electromotive force of the motor 10 can be higher than the output voltage of the battery pack 201 outputting direct current, that is, the back electromotive force of the motor 10 is considered to be abnormal. It should be noted that when the pressure difference between the back electromotive force of the motor 10 and the output voltage of the battery pack 201 outputting direct current is higher than a certain value, it is determined to be abnormal, and the specific value needs to be determined according to the actual use of the battery pack 201.

[0140] In this way, the second fault not only refers to the phase current signal of the circuit breaker 2, but also can detect whether the second fault exists according to the motor speed of the motor 10, the temperature of the power input channel of the motor 10, the back electromotive force of the motor 10, and the like, thereby enriching the triggering conditions of the second fault and the determination conditions of the secondary triggering, and making the control strategy of the driving system 200 more accurate. Of course, the second fault is not limited to this, and other signal detection sensors can be set according to actual use to detect other fault signals.

[0141] When the sensing chip 31 on the circuit board 3 of the circuit breaker 100 reports an IPM fault and meets the primary triggering condition, it is necessary to continue to determine whether the secondary triggering condition is met. At this time, the secondary triggering determination condition is whether the back electromotive force of the motor 10 is greater than the voltage of the battery pack 201, the current of the power input channel of the motor 10 exceeds the preset current threshold, the motor speed of the motor 10 exceeds the preset motor speed threshold, the temperature of the power input channel of the motor 10 exceeds the preset temperature threshold, and the like. When the controller chip receives any of the above faults, the secondary triggering condition is met. At this time, the driving system 200 meets the primary and secondary triggering conditions at the same time, the circuit breaker 100 is triggered to be disconnected, 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.

[0142] For example, in some other embodiments of the present application, a temperature sensor chip and a voltage detection chip can also be integrated on the circuit board 3. The temperature sensor chip can be used to detect the working temperature of the circuit breaker 2, and the voltage detection chip can be used to detect the voltage signal flowing into the motor 10. When the corresponding chip on the circuit board 3 detects the above over-temperature or over-voltage fault, the secondary triggering condition is met, and the signal processing chip controls the disconnection of the circuit breaker 2, and the circuit breaker 100 is disconnected. That is, for the detection of the second fault, different chips integrated on the circuit board 3 can be used for detection.

[0143] The circuit breaker 100, the drive system 200 and the control method according to the embodiments of the present application have other configurations and operations known to those skilled in the art, and thus detailed descriptions thereof are omitted herein.

[0144] In the description of the present application, it needs to 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" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and thus cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as a limitation on the present application.

[0145] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like 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 application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example.

[0146] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application 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 which is disposed within the housing (1); A circuit board (3), the circuit board (3) being arranged in the housing (1), and a shielding member (5) being provided on a side of the circuit board (3) facing the circuit breaker (2); A sensing chip (31), the sensing chip (31) being integrated into the circuit board (3), and the sensing chip (31) detecting a working signal of the circuit breaker (2); At least one arc extinguishing member (4), the arc extinguishing member (4) being located between the circuit breaker member (2) and the shielding member (5), and the arc extinguishing member (4) being provided on the shielding member (5).

2. The circuit breaker (100) according to claim 1, 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).

3. The circuit breaker (100) according to claim 1, characterized in that A first ground wire (51) is provided on the shielding member (5).

4. The circuit breaker (100) according to claim 3, 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).

5. The circuit breaker (100) according to claim 1, characterized in that The circuit breaker (2) comprises: a connecting section (20), at least a portion of the connecting section (20) passing through the housing (1) and extending outside the housing (1); A flow-through section (23), the flow-through section (23) is connected to the connecting section (20), and a cutting groove (231) is formed on the flow-through section (23).

6. The circuit breaker (100) according to claim 5, 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 outside 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 outside the shell (1), and the other end of the second connecting section (22) is connected to the other end of the flow section (23).

7. The circuit breaker (100) according to claim 6, 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 overflow 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).

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

9. The circuit breaker (100) according to claim 8, characterized in that There are two signal members (6), and the two signal members (6) are respectively a positive signal line and a negative signal line. 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).

10. The circuit breaker (100) according to claim 9, 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) ignites to trigger the disconnection element (2); An inference device (8) is provided between the combustion chamber (7) and the circuit breaker (2), and the fuel (71) burns to push the inference device (8) toward the circuit breaker (2) to cut off the circuit breaker (2).

11. The circuit breaker (100) according to claim 10, characterized in that The fuel (71) comprises: A first fuel (711) is burned to generate a force acting on the inference device (8) to push the inference device (8) toward the circuit breaker (2) to cut off the circuit breaker (2).

12. The circuit breaker (100) according to claim 11, characterized in that The fuel (71) further comprises: A second fuel (712) is burned to generate gas to transfer the arc generated by the circuit breaker (2) to the arc extinguishing member (4).

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

14. The circuit breaker (100) according to any one of claims 1-13, characterized in that The circuit board (3) is further provided with a plurality of conductors (32), and the plurality of conductors (32) include at least a second ground wire, a power line, and a communication line.

15. The circuit breaker (100) according to claim 14, 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).

16. 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 15, and the circuit breaker (100) is connected between the inverter (92) and the motor (10).

17. The drive system (200) according to claim 16, characterized in that The inverter (92) includes 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).

18. The drive system (200) according to claim 16, characterized in that The electronic control unit (9) further includes: A control panel (91), wherein the control panel (91) controls the circuit breaker (100) to be disconnected.

19. The drive system (200) according to claim 18, characterized in that The electronic control unit (9) further includes: A drive board, the drive board drives the inverter (92) to work, and a drive chip of the drive board detects power module failure.

20. The drive system (200) according to claim 19, characterized in that 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 sensing chip (31) of the circuit breaker (100) respectively. The signal processing chip communicates with the signal element (6) of the circuit breaker (100).

21. A control method for a drive system (200) according to any one of claims 16-20, characterized in that: The steps include: Obtaining status information of the electronic control unit (9); If no power module fault is reported, then continue to detect the status information of the electronic control unit (9); if a power module fault is reported, then obtain the status information of the motor (10); If the second fault is not reported, the state information of the electric control unit (9) is reacquired; if the second fault is reported, the circuit breaker (100) is controlled to be disconnected.

22. The control method of the drive system (200) according to claim 21, characterized in that: The second fault includes the current of the power input channel of the motor (10) exceeding a preset current threshold, the speed of the motor (10) exceeding a preset speed threshold, the temperature of the power input channel of the motor (10) exceeding a preset temperature threshold, or the back electromotive force of the motor (10) being abnormal.

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