Protection circuit, high-voltage circuit, electrical device, control method, device and medium

Abstract

Embodiments of the present application provide a protection circuit, a high-voltage loop, a power consumption device, a control method, equipment and a medium. The safety protection circuit comprises: at least two auxiliary switch units, the at least two auxiliary switch units correspond to at least two first control switch units one by one; a semiconductor switch unit, the semiconductor switch unit is connected in parallel with the first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit; a control module; wherein the first control switch unit is arranged on the power transmission line of the battery. According to the embodiments of the present application, the power consumption safety of the battery high-voltage loop can be improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to protection circuits, high-voltage circuits, electrical devices, control methods, equipment, and media. Background Art

[0002] With the rapid development of battery technology, there is an increasing demand for battery control, especially for high-voltage and high-current batteries.

[0003] However, when the main positive relay, charging positive relay and other relays connected to the battery are turned on or off, safety issues often arise due to the impact of instantaneous large current or arcing, adhesion and other reasons.

[0004] Therefore, a technical solution is needed to improve the power safety of high-voltage circuits. Summary of the Invention

[0005] The embodiments of the present application provide a protection circuit, a high-voltage circuit, an electrical device, a control method, equipment, and a medium, which can improve the electrical safety of a battery high-voltage circuit.

[0006] In a first aspect, an embodiment of the present application provides a safety protection circuit, the circuit comprising:

[0007] At least two auxiliary switch units, the at least two auxiliary switch units corresponding one-to-one to the at least two first control switch units, wherein N first control switch units are arranged on the power transmission line of the battery, and N is an integer greater than or equal to 2;

[0008] A semiconductor switch unit, the semiconductor switch unit being connected in parallel with a first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit;

[0009] a control module configured to receive a target control instruction; enter a target phase in response to the target control instruction; and in the target phase, control an auxiliary switch unit corresponding to a target switch unit among the N first control switch units to be in a first on-off state, and control the semiconductor switch unit to be in a second on-off state;

[0010] The target phase includes: a pre-charging phase corresponding to the target switch unit and / or a switching phase in which the target switch unit switches between on and off states;

[0011] If the target phase includes a pre-charge phase, the first on-off state is a continuous on-state, and the second on-off state is an intermittent on-state;

[0012] If the target operating condition includes a switching phase, the first on-off state is a continuous on-state, and the second on-off state is a continuous on-state.

[0013] In a second aspect, the embodiments of the present application provide a circuit control method, applied to the safety protection circuit provided in the first aspect or any of the embodiments of the first aspect,

[0014] The control method comprises:

[0015] receiving a target control instruction;

[0016] in response to the target control instruction, entering a target phase, and in the target phase, controlling the auxiliary switch unit corresponding to the target switch unit in the N first control switch units to be in a first on-off state, and controlling the semiconductor switch unit to be in a second on-off state;

[0017] The target phase comprises a pre-charge phase corresponding to the target switch unit and / or a switching phase for switching the on-off state of the target switch unit.

[0018] If the target phase comprises the pre-charge phase, the first on-off state is a continuous conduction state, and the second on-off state is an interval conduction state.

[0019] If the target phase comprises the switching phase, the first on-off state is a continuous conduction state, and the second on-off state is a continuous conduction state.

[0020] In a third aspect, the embodiments of the present application provide a battery high-voltage loop, comprising:

[0021] The safety protection circuit provided in the first aspect or any of the optional embodiments of the first aspect;

[0022] and the first control switch unit, wherein the first control switch unit is arranged on the power transmission line of the battery.

[0023] In a fourth aspect, a power consumption device is provided, comprising:

[0024] The battery high-voltage circuit provided in the second aspect or any of the optional embodiments of the second aspect;

[0025] and the battery.

[0026] In a fifth aspect, a circuit control device is provided, comprising:

[0027] a processor and a memory storing computer program instructions;

[0028] The processor reads and executes the computer program instructions to realize the circuit control method provided in the second aspect or any of the optional embodiments of the second aspect.

[0029] In a fourth aspect, a computer storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the circuit control method provided by the second aspect or any optional implementation of the second aspect is implemented.

[0030] The protection circuit, high-voltage circuit, electrical device, control method, equipment and medium of the embodiments of the present application, since the semiconductor switch unit passes through each auxiliary switch unit and is connected in parallel with the first control switch unit corresponding to each auxiliary switch unit, when in the switching stage before the on-off state of the first control switch unit changes, the auxiliary switch unit and the semiconductor switch unit are controlled to be in a continuous on state, and the semiconductor switch unit can be controlled to be intermittently turned on and off during the corresponding pre-charging process, avoiding safety risks such as arcing or adhesion of the relay contacts, and improving the power safety of the battery high-voltage circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0032] Figure 1 It is a circuit diagram of a battery high voltage circuit and its pre-charge circuit;

[0033] Figure 2 This is a schematic structural diagram of a battery high-voltage circuit provided in an embodiment of the present application;

[0034] Figure 3 is a schematic structural diagram of an exemplary battery high-voltage circuit provided in an embodiment of the present application;

[0035] Figure 4 This is a schematic structural diagram of another battery high-voltage circuit provided in an embodiment of the present application;

[0036] Figure 5 This is a structural diagram of another battery high-voltage circuit provided in an embodiment of the present application;

[0037] Figure 6 is a schematic structural diagram of an exemplary battery high-voltage circuit provided in an embodiment of the present application;

[0038] Figure 7 This is a flow chart of a circuit control method provided in an embodiment of the present application;

[0039] Figure 8 is a flow chart of another circuit control method provided in an embodiment of the present application;

[0040] Figure 9 This is a flow chart of another circuit control method provided in an embodiment of the present application;

[0041] Figure 10 1 is a flow chart of another circuit control method provided in an embodiment of the present application;

[0042] Figure 11 A schematic diagram of the hardware structure of a circuit control device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0045] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0047] In some cases, Figure 1 This is a circuit diagram of a battery high voltage circuit and its pre-charge circuit. Figure 1 As shown, the battery high-voltage circuit includes: a main positive switch unit K1+, a positive charging switch unit K2+, and a first power switch unit K3+. Among them, the main positive switch unit K1+, the positive charging switch unit K2+, and the first power switch unit K3+ can all be relays.

[0048] First, for the main positive switch unit K1+. The main positive switch unit K1+ is set between the positive electrode of the battery P1 and the motor ( Figure 1 (not shown). Specifically, one end of the main positive switch unit K1+ is connected to the positive electrode of battery P1, and the other end of the main positive switch unit K1+ is connected to the motor positive terminal connection port A1+. The motor positive terminal connection port A1+ is used to connect to the positive terminal of the motor. The negative terminal of the motor is connected to the negative terminal of battery P1 via the motor negative terminal connection port A1- and the main negative switch unit K1-.

[0049] Next, regarding the positive charging switch unit K2+, the positive charging switch unit K2+ is set between the positive electrode of the battery P1 and the external charging device ( Figure 1 (not shown). Specifically, one end of the positive charging switch unit K2+ is connected to the positive electrode of battery P1, and the other end of the positive charging switch unit K2+ is connected to the positive charging port A2+. The positive charging port A2+ is used to connect to the positive port of an external charging device. The negative port of the external charging device is connected to the negative electrode of battery P1 through the negative charging port A2- and the negative charging switch unit K2-.

[0050] Next, regarding the first power switch unit K3+, the first power switch unit K3+ is provided between the positive electrode of the battery P1 and the high voltage power device ( Figure 1Specifically, one end of the first power switch unit K3+ is connected to the positive electrode of the battery P1, and the other end of the first power switch unit K3+ is connected to the high-voltage output port A3+. The high-voltage output port A3+ is used to connect one end of a high-voltage electrical device.

[0051] Continue to see Figure 1 The pre-charging circuit includes a first pre-charging switch K41, a second pre-charging switch K42, a third pre-charging switch K43, a first pre-charging resistor R1, a second pre-charging resistor R2, and a third pre-charging resistor R3. The first pre-charging switch K41, the second pre-charging switch K42, and the third pre-charging switch K43 are all relays.

[0052] The first pre-charging switch K41 and the first pre-charging resistor R1 are connected in series in parallel with the main positive switch unit K1+. Specifically, one end of the first pre-charging switch K41 is connected to one end of the main positive switch unit K1+, the other end of the first pre-charging switch K41 is connected to one end of the first pre-charging resistor R1, and the other end of the first pre-charging resistor R1 is connected to the other end of the main positive switch unit K1+. Before the main positive switch unit K1+ is closed, the first pre-charging switch K41 remains on to pre-charge the motor.

[0053] The second pre-charge switch K42 and the second pre-charge resistor R2 are connected in series in parallel with the positive charging switch unit K2+. Specifically, one end of the second pre-charge switch K42 is connected to one end of the positive charging switch unit K2+, the other end of the second pre-charge switch K42 is connected to one end of the second pre-charge resistor R2, and the other end of the second pre-charge resistor R2 is connected to the other end of the positive charging switch unit K2+. Before the positive charging switch unit K2+ is closed, the second pre-charge switch K42 remains on to pre-charge the external charging device.

[0054] The third pre-charge switch K43 and the third pre-charge resistor R3 are connected in parallel with the first power switch unit K3+. Specifically, one end of the third pre-charge switch K43 is connected to one end of the first power switch unit K3+, the other end of the third pre-charge switch K43 is connected to one end of the third pre-charge resistor R3, and the other end of the third pre-charge resistor R3 is connected to the other end of the first power switch unit K3+. Before the first power switch unit K3+ is closed, the third pre-charge switch K43 remains on to pre-charge the high-voltage electrical components.

[0055] Also, see Figure 1The battery high-voltage circuit may further include a first sampling module 11 for collecting the voltage of a first sampling port P1, a second sampling module 12 for collecting the voltage of a second sampling port P2, and a third sampling module 13 for collecting the voltage of a third sampling port P3. The first sampling port P1 is located at the other end of the main positive switch unit K1+, the second sampling port P2 is located at the other end of the charging positive switch unit K2+, and the third sampling port P3 is located at the other end of the first power switch unit K3+.

[0056] In addition, the battery high-voltage circuit may further include a control module 20. The control module 20 determines whether to end the corresponding pre-charging process based on the voltages collected by the first sampling port P1, the second sampling module 12, and the third sampling module 13, and thus based on the voltage of the other end P1 of the main positive switch unit K1+, the voltage of the other end P2 of the charging positive switch unit K2+, and the voltage of the first power switch unit K3+.

[0057] In addition, see Figure 1 The battery high voltage circuit may also include: a main negative switch unit K1-, a charge negative switch unit K2- and a second power switch unit ( Figure 1 not shown).

[0058] One end of the main negative switch unit K1- is connected to the negative electrode of the battery P1, and the other end of the main negative switch unit K1- is connected to the negative electrode of the motor. 1- connect.

[0059] One end of the charge-negative switch unit K2- is connected to the negative electrode of the battery P1, and the other end of the charge-negative switch unit K2- is connected to the negative charging port A 2- connect.

[0060] One end of the second power switch unit is connected to the negative electrode of battery P1, and the other end of the second power switch unit is connected to the high-voltage output port. It should be noted that this connection relationship is not shown in the figure. In some cases, the other end of the high-voltage electrical device and the negative electrode of battery P1 can both be grounded. In this case, the other end of the high-voltage electrical device can be considered to be directly connected to the negative electrode of battery P1.

[0061] However, the voltage high-voltage circuit and pre-charge circuit in the above situation have the following technical problems: (1) During the high-voltage power-on and power-off process of the main positive switch unit K1+, the positive charging switch unit K2+ and the first power switch unit K3+, there are safety risks such as arcing or adhesion of the relay contacts, as well as load closing and load disconnection. (2) The main positive switch unit K1+, the positive charging switch unit K2+ and the first power switch unit K3+ all need to be connected in parallel with a pre-charge branch, which causes problems such as structural redundancy and cost waste. (3) It is necessary to set up multiple sampling modules and multiple sampling ports respectively, which causes problems such as structural redundancy and cost waste. (4) During the pre-charge process, the pre-charge switch is continuously turned on, resulting in low pre-charge efficiency due to the low pre-charge current.

[0062] Therefore, a technical solution is needed that can solve at least one of the above-mentioned defects.

[0063] Based on this, the embodiments of the present application provide a protection circuit, a high-voltage circuit, an electrical device, a control method, equipment and a medium, which can be applied to application scenarios that improve the electrical safety of the battery high-voltage circuit. For example, it can be specifically applied to a specific application scenario in which the first control switch unit provided on the power transmission circuit of the battery is turned on, the first control switch unit is disconnected, or the first control switch unit is pre-charged. Compared with the above-mentioned related technologies, since the semiconductor switch unit can be connected in parallel with the first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit, during the switching stage of the on-off state of the first control switch unit, the auxiliary switch unit and the semiconductor switch unit are controlled to be in a continuous on state, and the semiconductor switch unit can be controlled to be intermittently turned on and off during the corresponding pre-charging process, thereby avoiding safety risks such as arcing or adhesion of the relay contacts, and improving the electrical safety of the battery high-voltage circuit.

[0064] First, in order to better understand the present application, the embodiments of the present application provide specific explanations of concepts such as batteries, semiconductor switch units, mechanical switches, and high-voltage electrical devices.

[0065] (1) Batteries. The batteries in the embodiments of the present application may be lithium-ion batteries, lithium metal batteries, lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-sulfur batteries, lithium-air batteries or sodium-ion batteries, etc., which are not limited here. In terms of scale, the batteries in the embodiments of the present application may be single cells, battery modules or battery packs, which are not limited here. In terms of application scenarios, the batteries can be used in power plants such as automobiles and ships. For example, they can be used in electric vehicles to power the motors of electric vehicles and serve as a power source for electric vehicles. The batteries can also power other electrical devices in electric vehicles, such as in-car air conditioners, car players, etc.

[0066] (2) A semiconductor switch unit, which refers to a switch made of semiconductor. For example, the semiconductor switch unit can be specifically implemented as a triode, a metal-oxide-semiconductor field-effect transistor (MOSFET), or an insulated gate bipolar transistor (IGBT). The specific type of the semiconductor switch unit Q1 is not limited.

[0067] (3) Mechanical switch: A mechanical switch is a switch that uses mechanical contact to change the on / off state of a circuit. In addition, a mechanical switch can also have an electrical isolation function. For example, the mechanical switch can be a relay or other mechanical switch, which is not limited to this.

[0068] (4) High-voltage electrical devices. In the embodiments of the present application, high-voltage electrical devices refer to electrical devices other than motors that use batteries as power sources. For example, for a battery installed in a car, high-voltage electrical devices may include a direct current-direct current (DCDC) converter, an on-board charger (OBC), a power distribution unit (PDU), an oil pump, a water pump, an air conditioner (AC) compressor, etc.

[0069] After introducing the above concepts, in order to better understand the present application, the safety protection circuit, battery high-voltage circuit and electrical device according to the embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that these embodiments are not intended to limit the scope of disclosure of the present application.

[0070] First, the embodiment of the present application first provides a detailed description of the electrical device.

[0071] The electrical device in the embodiment of the present application may refer to a device that uses the battery P1 as a power source, such as an electric car, an electric boat, and the like.

[0072] Specifically, the power battery may include a battery P1 and a battery high-voltage circuit, wherein the battery high-voltage circuit may include a safety protection circuit and a first control switch unit.

[0073] First, before introducing the first control switch unit, the embodiment of the present application first specifically explains the control switch unit on the battery P1 transmission line. The battery P1 transmission line includes a positive transmission line and a negative transmission line. The positive transmission line represents the connection line between the positive electrode of the battery P1 and devices such as the motor, external charging device, and high-voltage electrical devices. Correspondingly, the negative transmission line represents the connection line between the negative electrode of the battery P1 and the above-mentioned devices. In one example, the positive transmission line of the battery includes: N of the positive transmission lines between the battery P1 and the motor, the positive transmission line between the battery P1 and the external charging device, and the positive transmission line between the battery P1 and the high-voltage electrical devices. In another example, the negative transmission line of the battery includes: M of the negative transmission lines between the battery P1 and the motor, the negative transmission line between the battery P1 and the external charging device, and the negative transmission line between the battery P1 and the high-voltage electrical devices.

[0074] In order to facilitate the control of the power transmission process of the battery P1, in one case, a positive control switch unit and a negative control switch unit are respectively provided on the positive power transmission line and the negative power transmission line of the battery P1. Figure 2 This is a schematic diagram of the structure of a battery high voltage circuit provided by an embodiment of the present application. Figure 2 As shown, the positive transmission line of battery P1 is provided with positive control switch units K61+ to K6N+, and the negative transmission line of battery P1 is provided with negative control switch units K61- to K6M-. Wherein, M and N are any positive integers, for example, M and / or N are greater than or equal to 2.

[0075] In another case, a positive control switch unit is provided on the positive transmission line of the battery P1, such as a main positive switch unit, a positive charging switch unit and a first power switch unit. Figure 2 Positive control switch units K61+ to K6N+ are provided on the positive transmission line of battery P1, and negative control switch units are not provided on the negative transmission line of battery P1.

[0076] In another embodiment, the negative transmission line of battery P1 is provided with negative control switch units, such as a main negative switch unit, a charging negative switch unit, and a second power switch unit. For example, no positive control switch unit is provided on the positive transmission line of battery P1, and negative control switch units K61- to K6M- are provided on the negative transmission line of battery P1.

[0077] After introducing the positive control switch unit and the negative control switch unit, the following part of the embodiment of the present application specifically describes the first control switch unit.

[0078] In one case, that is, when a positive control switch unit is provided on the positive transmission line of the battery P1, the first control switch unit is a positive control switch unit, for example, Figure 2 , the first control switch unit may be a positive control switch unit K61+ to K6N+.

[0079] In one embodiment, the first control switch units K61+ to K6N+ may be N of the main positive switch unit, the charging positive switch unit, and the first power switch unit. The external charging device may be a charging pile or a vehicle charger or other charging device.

[0080] Among them, the first control switch units K61+ to K6N+ can be determined by the function of the electrical device. In one example, if the electrical device does not have a charging function, the first control switch units K61+ to K6N+ may include a main positive switch unit and a power switch unit. In another example, if the high-voltage electrical device of the electrical device is powered by a power source other than the battery P1, the first control switch units K61+ to K6N+ may include a main positive switch unit and a charging positive switch unit. In another example, if the electrical device has a charging function and the high-voltage electrical device can be powered by the battery P1, the first control switch units K61+ to K6N+ may include a main positive switch unit, a charging positive switch unit and a power switch unit. It should be noted that, depending on the function of the electrical device, the first control switch unit may also exist in other combinations, and the embodiments of the present application do not specifically limit this. It should be noted that the specific contents of the main positive switch unit, the charging positive switch unit and the power switch unit can be found in the above embodiments of the present application in combination with the above embodiments. Figure 1 The relevant description will not be repeated here.

[0081] In another case, that is, when a negative electrode control switch unit is provided on the negative electrode transmission line of the battery P1, the first control switch unit is a negative electrode control switch unit, for example, Figure 2 The first control switch unit may be a negative electrode control switch unit K61- to K6M-. In a specific example, the first control switch unit K61- to K6M- may be M of the main negative switch unit, the charging negative switch unit, and the second power switch unit.

[0082] Among them, in one example, if the electrical device does not have a charging function, the first control switch unit K61- to K6M- may include a main negative switch unit and a first electrical switch unit. In another example, if the high-voltage electrical device of the electrical device is powered by a power source other than the battery P1, the first control switch unit K61- to K6M- may include a main negative switch unit and a charging and negative switch unit. In another example, if the electrical device has a charging function and the high-voltage electrical device can be powered by the battery P1, the first control switch unit K61- to K6M- may include a main negative switch unit, a charging and negative switch unit, and a second electrical switch unit. It should be noted that, depending on the function of the electrical device, the first control switch unit may also exist in other combinations, and the embodiments of the present application do not specifically limit this. It should be noted that the specific contents of the main negative switch unit, the charging and negative switch unit, and the second electrical switch unit can be found in the above embodiments of the present application in combination with the above embodiments. Figure 1 The relevant description will not be repeated here.

[0083] In another case, that is, when a positive control switch unit and a negative control switch unit are respectively provided on the positive and negative transmission lines of battery P1, the first control switch unit may include positive control switch units K61+ to K6N+ and / or negative control switch units K61- to K6M-. For the first control switch unit, reference may be made to the relevant description of the above embodiments of the present application, and no further description is given here.

[0084] After introducing the first control switch unit, the following part of the embodiment of the present application will provide a detailed description of the safety protection circuit.

[0085] For ease of understanding, the following parts of the embodiments of this application will continue to combine Figure 2 The safety protection circuit is described in detail. It should be noted that: Figure 2 Only one case in which the first switch control unit is a positive-pole control switch unit is shown. In other cases, the first switch control unit may also include a negative-pole control switch unit. If the first switch control unit includes only a negative-pole control switch unit, then the semiconductor switch unit Q1 is sequentially connected in parallel with the M negative-pole control switch units via M auxiliary switch units. Furthermore, if the first control switch unit includes a positive-pole control switch unit and a negative-pole control switch unit, then there are two semiconductor switch units, one of which is sequentially connected in parallel with the N positive-pole control switch units via N auxiliary switch units, and the other semiconductor switch unit is sequentially connected in parallel with the M negative-pole control switch units via M auxiliary switch units.

[0086] Continue to see Figure 2 The safety protection circuit includes: N auxiliary switch units K51 to K5N, a semiconductor switch unit Q1 and a control module 30.

[0087] First, regarding the auxiliary switch units, the N auxiliary switch units K51 to K5N correspond one-to-one to the N first control switch units K61+ to K6N+. That is, the auxiliary switch unit K51 corresponds to the first control switch unit K61+, the auxiliary switch unit K52 corresponds to the first control switch unit K62+, ..., and the auxiliary switch unit K5N corresponds to the first control switch unit K6N+.

[0088] In one embodiment, the N auxiliary switch units K51 to K5N may be mechanical switches.

[0089] In the embodiment of the present application, the auxiliary switch units K51 to K5N are set as mechanical switches, which has the following advantages compared to the solution of setting them as semiconductor switch units: (1) the conduction loss can be reduced; (2) the risk of thermal runaway caused by the heat generation of the semiconductor switch unit is reduced; (3) since there is no need to set up a separate heat dissipation structure, the risk of thermal failure and the problem of increased cost are reduced; (4) the electrical characteristics of the semi-mechanical switch are utilized to achieve electrical isolation of the safety protection circuit, so that the safety protection circuit meets the automotive grade isolation standard.

[0090] Next, let's consider the semiconductor switch unit Q1.

[0091] The semiconductor switch unit Q1 is connected in parallel with the first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit. Figure 2 One end of the semiconductor switch unit Q1 is connected to the positive electrode of the battery P1, and the other end of the semiconductor switch unit Q1 is connected to the other end of the first control switch unit K61+ through the auxiliary switch unit K51. One end of the first control switch unit K61+ is connected to the positive electrode of the battery P1. .... One end of the semiconductor switch unit Q1 is connected to the positive electrode of the battery P1, and the other end of the semiconductor switch unit Q1 is connected to the other end of the first control switch unit K6N+ through the auxiliary switch unit K5N. One end of the first control switch unit K6N+ is connected to the positive electrode of the battery P1.

[0092] Next, regarding the control module 30 .

[0093] The control module 30 can control the on / off of the semiconductor switch unit Q1 and at least one auxiliary switch unit K51 to K5N during the pre-charging phase and / or during the switching phase in which at least one first control switch unit K61+ to K6N+ switches between on and off states. Specifically, the control module 30 can be implemented as a microcontroller (MCU). In one example, the control module 30 can be implemented as a high-voltage power distribution unit (PDU).

[0094] Specifically, the control module 30 may receive a target control instruction; in response to the target control instruction, enter a target phase. In the target phase, the auxiliary switch unit corresponding to the target switch unit in the N first control switch units is controlled to be in a first on-off state, and the semiconductor switch unit is controlled to be in a second on-off state. The target switch unit corresponds to the pre-charge phase and / or the switching phase in which the target switch unit switches the on-off state. In one example, see Figure 2 , the target switch unit may be one or more of the first control switch units K61+ to K6N+.

[0095] In some embodiments, the control module 30 is further configured to control the auxiliary switch unit corresponding to the target switch unit to be in a continuously disconnected state, and control the semiconductor switch unit to be in a continuously disconnected state after the target phase ends.

[0096] In some embodiments, the control module 30 may include a first control unit and a second control unit.

[0097] The first control unit is used to control the auxiliary switch unit corresponding to the target switch unit to enter a first on-off state.

[0098] The second control unit is configured to control the semiconductor switch unit to enter the second on-off state after a preset time period has passed since the auxiliary switch unit corresponding to the target switch unit enters the first on-off state.

[0099] The following part of this application will respectively describe the control module 30 in detail in conjunction with the pre-charging stage and the switching stage of the on-off state switching.

[0100] First, focus on the pre-charge stage.

[0101] If the target phase is the pre-charge phase corresponding to the target switch unit, the first on-off state is a continuous on state, and the second on-off state is an intermittent on state, wherein the intermittent on state is a state where the device is on for part of the time and off for the other part of the time.

[0102] That is, in the pre-charging stage, the control module 30 is specifically configured to control the auxiliary switch unit corresponding to the target switch unit to be continuously turned on, and to control the semiconductor switch unit Q1 to be intermittently turned on during the pre-charging process corresponding to the target switch unit.

[0103] For the specific control method of the switch during the pre-charging process. Exemplarily, if the target switch unit includes a main positive switch unit, then in the process of pre-charging the capacitor of the motor, the auxiliary switch unit K51 is controlled to be continuously turned on, and the semiconductor switch unit Q1 is controlled to be intermittently turned on. Another exemplary embodiment, if the target switch unit includes a charging positive switch unit, then in the process of pre-charging the capacitor of the external charging device, the auxiliary switch unit K52 is controlled to be continuously turned on, and the semiconductor switch unit Q1 is controlled to be intermittently turned on. In another exemplary embodiment, if the target switch unit includes a power switch unit, then in the process of pre-charging the capacitor of the high-voltage electrical device, the auxiliary switch unit K53 is controlled to be continuously turned on, and the semiconductor switch unit Q1 is controlled to be intermittently turned on. It should be noted that the specific implementation methods of the target switch unit being the main negative switch unit, the charging negative switch unit or the second power switch unit are similar and will not be repeated here.

[0104] For example, the control signal that causes the semiconductor switch unit Q1 to be intermittently turned on and off can be input to the control terminal of the semiconductor switch unit Q1 to control the semiconductor switch unit Q1 to be intermittently turned on. For example, the pulse signal can be a pulse width modulation (PWM) signal.

[0105] In one example, the period and duty cycle of the PWM signal required for the capacitor to be charged to 95% or more of the power supply voltage within the required pre-charge time can be calculated based on the parameters of the load capacitor and the pre-charge time requirements. Then, when the circuit current remains within a safe range, the PWM control unit outputs the PWM signal with this specific period and specific duty cycle. The PWM signal can be output to the control end of the semiconductor switch unit Q1, such as the gate of the semiconductor switch. In addition, the PWM signal can also be transmitted synchronously to the MCU.

[0106] In a specific example,

[0107] The first control unit is used to control the auxiliary switch unit corresponding to the target switch unit to enter a continuously conducting state. The target switch unit may be one or more switch units in the first control switch unit. In one example, the first control unit may control the auxiliary switch unit corresponding to the target switch unit to close in response to a pre-charge instruction. For example, the pre-charge instruction may be sent by a battery management system (BMS).

[0108] In one example, the first control unit can enter a pre-charging process of the motor capacitor after receiving the power-on request instruction of the electric device. For example, the electric device can be an electric vehicle. In another example, the first control unit can enter a pre-charging process of the capacitor of the external charging device after receiving the charging request instruction of the battery P1. In yet another example, the first control unit can enter a pre-charging process of the capacitor of the high-voltage electric device after receiving the power-on request instruction of the high-voltage electric device.

[0109] The second control unit is configured to control the semiconductor switch unit to be intermittently turned on after a preset time period from the closing of the corresponding auxiliary switch unit. In one example, in order to prevent the risk of arc, it can be ensured that the semiconductor switch unit Q1 can be turned on earlier than the auxiliary switch unit. At this time, the preset time period is greater than or equal to the time period required for the auxiliary switch unit to be turned on from the off state, for example, the preset time period can be 20 milliseconds (ms). It should be noted that the preset time period can also be set according to the specific scene and actual demand, which is not limited here.

[0110] In the embodiments of the present application, compared with the scheme of controlling the pre-charging switch to be continuously turned on, the pre-charging current can be controlled according to the turn-on frequency, the duty cycle of the control signal and other parameters, and then the pre-charging rate can be flexibly adjusted, thereby improving the flexibility of the entire pre-charging process.

[0111] In addition, in the embodiments of the present application, the semiconductor switch unit Q1 is controlled to be intermittently turned on, and there is no risk of arc or sticking of the semiconductor switch unit, thereby improving the power safety of the pre-charging process.

[0112] In one embodiment, in order to improve the power safety, the control module 30 can further include a third control unit.

[0113] The third control unit is configured to control the target switch unit to be closed first, and then control the semiconductor switch unit and the auxiliary switch unit corresponding to the target switch unit to be sequentially opened after the pre-charging process is completed. In one example, whether to stop the pre-charging process can be determined according to whether the voltage value of the other end of the target switch unit collected by the sampling module is close to the voltage value of the battery. In yet another example, in order to improve the judgment accuracy, whether to stop the pre-charging process can be determined according to whether the voltage value of the other end of the target switch unit is close to the voltage value of the battery and whether the current value in the pre-charging loop is close to zero. It should be noted that one end of the target switch unit is connected to the positive electrode of the battery.

[0114] Next, the target switch unit is switched to an on-off state, wherein the target switch unit can be switched from an off state to an on state, or from an on state to an off state.

[0115] The control module 30 is configured to control the auxiliary switch unit and semiconductor switch unit Q1 corresponding to the target switch unit to be in a continuously conductive state during the switching phase in which the target switch unit switches between on and off states. Specifically, the auxiliary switch unit and semiconductor switch unit Q1 corresponding to the target switch unit can be controlled to be conductive before the target switch unit is turned on or off. In other words, during the switching phase, the semiconductor switch unit and auxiliary switch unit can first be controlled to enter a continuously conductive state, and then the target switch unit can be controlled to switch from an off state to an on state, or from an on state to an off state.

[0116] In one embodiment, if the auxiliary switch unit is a mechanical switch, to prevent arcing or sticking, the auxiliary switch unit can be turned on first, followed by the semiconductor switch unit Q1. Specifically, after the auxiliary switch unit K5i is turned on, a preset time period elapses before the semiconductor switch unit Q1 is turned on. The preset time period can be found in the description of the above embodiments of this application and will not be further described. Wherein, i is any positive integer less than or equal to N.

[0117] In one embodiment, after the on-off state of the target switch unit is switched, the semiconductor switch unit Q1 and the auxiliary switch unit may be controlled to be turned off in sequence.

[0118] In an embodiment of the present application, since safety risks such as arcing may exist during the switching of the on-off state of the first control switch unit, the auxiliary switch unit and the semiconductor switch unit are controlled to be turned on first before the on-off state of the first control switch unit is switched, thereby avoiding safety risks such as arcing and improving safety.

[0119] According to the safety protection circuit provided in the embodiment of the present application, since the semiconductor switch unit is connected in parallel with the first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit, during the on-off state switching stage of the first control switch unit, the auxiliary switch unit and the semiconductor switch unit are controlled to be turned on, and the semiconductor switch unit can be controlled to be intermittently turned on and off during the corresponding pre-charging process, thereby avoiding safety risks such as arcing or adhesion of the relay contacts, and improving the power safety of the battery high-voltage circuit.

[0120] In addition, since only one semiconductor switch unit is needed to control multiple first control switch units, multiplexing of semiconductor switch units is achieved, thereby saving costs and simplifying the circuit structure. Figure 3 Taking the example that the first control switch unit may include a main positive switch unit, a charging positive switch unit and a power switch unit, the specific connection structure of the safety protection circuit is described in detail.

[0121] Figure 3 This is a schematic diagram of an exemplary safety protection circuit provided in an embodiment of the present application. Figure 3 As shown, the first control switch unit includes a main positive switch unit K61+, a charging positive switch unit K62+ and a power switch unit K63+.

[0122] Correspondingly, the safety protection circuit includes: an auxiliary switch unit K51, an auxiliary switch unit K52, an auxiliary switch unit K53 and a semiconductor switch unit Q1.

[0123] Continue to see Figure 3 One end of the semiconductor switch unit Q1, one end of the main positive switch unit K61+, one end of the charging positive switch unit K62+, and one end of the power switch unit K63+ are all connected to the positive electrode of the battery P1.

[0124] The other end of the semiconductor switch unit Q1 is connected to the other end of the main positive switch unit K61+ through the auxiliary switch unit K51.

[0125] The other end of the semiconductor switch unit Q1 is connected to the other end of the charging switch unit K62+ through the auxiliary switch unit K52.

[0126] The other end of the semiconductor switch unit Q1 is connected to the other end of the power switch unit K63+ through the auxiliary switch unit K53.

[0127] In some embodiments, the control module 30 may control the main positive switch unit K61+ to be turned on according to the power-on request instruction of the electrical device. Accordingly, the control module 30 may include:

[0128] The first control unit is configured to receive a high-voltage power-on request instruction from an electrical device and control the auxiliary switch unit K51 to be turned on after a preset time (greater than the reaction time required for relay closure, such as 20ms).

[0129] The second control unit is used to control the semiconductor switch unit Q1 to be intermittently turned on after the auxiliary switch unit K51 is turned on and a preset time has passed, so as to pre-charge the motor capacitor.

[0130] The third control unit is configured to control the main positive switch unit K61+ to be turned on when the pre-charging is completed and the semiconductor switch unit Q1 and the auxiliary switch unit K51 remain in the on state.

[0131] It should be noted that if the first control switch unit includes a negative control switch unit, the specific control method of the control module 30 after receiving the power-on request instruction of the electrical device is similar to that of the positive control switch unit, and is not repeated here.

[0132] In one example, the control module 30 further includes:

[0133] The fourth control unit is configured to control the semiconductor switch unit Q1 and the auxiliary switch unit K51 to be turned off in sequence after the main positive switch unit K61+ is turned on and a preset time has passed.

[0134] It should be noted that after the main positive switch unit K61+ is turned on, the semiconductor switch unit Q1 and the auxiliary switch unit K51 are controlled to be disconnected, which can avoid energy loss of the semiconductor switch unit Q1 and avoid heating of the semiconductor switch unit Q1 after the vehicle is powered on. No additional thermal design is required, which reduces costs.

[0135] In one example, the control module 30 further includes:

[0136] The fifth control unit is used to diagnose the status of the semiconductor switch unit Q1 before the main positive switch unit K61+ is turned on. Specifically, if the semiconductor switch unit Q1 is in the on state, the semiconductor switch unit status is determined to be normal, and the main positive switch unit K61+ can be controlled to conduct normally. If the semiconductor switch unit Q1 is in the off state, a fault is reported and the vehicle power-off process is executed.

[0137] It should be noted that the fifth control unit can ensure that the main positive switch unit K61+ will not face the abnormal working condition of load closing, further avoiding the occurrence of risks such as arcing in the main positive switch unit K61+, thereby further improving the safety of electricity use.

[0138] In some embodiments, the control module 30 may control the positive charging switch unit K62+ to be turned on according to the charging request instruction of the battery P1. Accordingly, the control module 30 includes:

[0139] The sixth control unit is configured to control the auxiliary switch unit K52 to be turned on after receiving a charge request instruction from the battery P1 and after a preset time has passed.

[0140] The seventh control unit is used to control the semiconductor switch unit Q1 to be intermittently turned on after the auxiliary switch unit K52 is turned on and a preset time has passed, so as to pre-charge the capacitor of the external charging device.

[0141] The eighth control unit is used to control the positive charging switch unit K62+ to be turned on when the pre-charging is completed and the semiconductor switch unit Q1 and the auxiliary switch unit K52 remain in the on state.

[0142] It should be noted that if the first control switch unit includes a negative electrode control switch unit, the specific control method of the control module 30 after receiving the charging request instruction of the battery P1 is similar to that of the positive electrode control switch unit, and is not repeated here.

[0143] In one example, the control module 30 further includes:

[0144] The ninth control unit is configured to control the semiconductor switch unit Q1 and the auxiliary switch unit K52 to be turned off in sequence after the positive charging switch unit K62+ is turned on and a preset time has passed.

[0145] In one example, the control module 30 further includes:

[0146] The tenth control unit is configured to diagnose the status of the semiconductor switch unit Q1 before the positive charging switch unit K62+ is turned on. Specifically, if the semiconductor switch unit Q1 is in the on state, the semiconductor switch unit Q1 is determined to be normal, and the positive charging switch unit K62+ can be controlled to be turned on normally. If the semiconductor switch unit Q1 is in the off state, a fault is reported and the vehicle power-off process is executed.

[0147] It should be noted that the tenth control unit can ensure that the charging switch unit K62+ will not face the abnormal working condition of load closure, further avoiding the occurrence of risks such as arcing in the charging switch unit K62+, thereby further improving the safety of electricity use.

[0148] In some embodiments, the control module 30 may control the main positive switch unit K61+ to disconnect according to the power-off request instruction of the power-consuming device. Accordingly, the control module 30 may include:

[0149] The eleventh control unit is configured to control the auxiliary switch unit K51 to be turned on after receiving the power-off request instruction of the electric device. In one example, the control module 30 may also control the high-voltage components of the electric device to discharge in response to the power-off request instruction of the electric device.

[0150] The twelfth control unit is configured to control the semiconductor switch unit Q1 to be turned on after the auxiliary switch unit K51 is turned on and a preset time has passed.

[0151] The thirteenth control unit is configured to control the main positive switch unit K61+ to be turned off after the semiconductor switch unit Q1 is turned on and a preset time period has passed.

[0152] It should be noted that if the first control switch unit includes a negative electrode control switch unit, the specific control method of the control module 30 after receiving the power-off request instruction of the battery P1 is similar to that of the positive electrode control switch unit, which will not be repeated here.

[0153] In one example, the control module 30 further includes:

[0154] The fourteenth control unit is configured to control the semiconductor switch unit Q1 and the auxiliary switch unit K51 to be disconnected in sequence after the main positive switch unit K61+ is disconnected and a preset time has passed.

[0155] In some embodiments, to further improve safety, the control module 30 further includes a fifteenth control unit.

[0156] The fifteenth control unit is configured to control the main negative switch unit K61- to be disconnected after the semiconductor switch unit Q1 and the auxiliary switch unit K51 are disconnected and a preset time period has passed.

[0157] In one example, the control module 30 further includes:

[0158] The sixteenth control unit is configured to diagnose the status of the semiconductor switch unit Q1 before disconnecting the main positive switch unit K61+. Specifically, if the semiconductor switch unit Q1 is in the on state, the semiconductor switch unit Q1 is determined to be normal, and the main positive switch unit K61+ may be controlled to disconnect normally. If the semiconductor switch unit Q1 is in the off state, the fault is reported and an emergency power-off procedure is executed. In a specific example, the emergency power-off procedure may include first disconnecting the main negative switch unit K61- and then disconnecting the main positive switch unit K61+.

[0159] It should be noted that the sixteenth control unit can ensure that the main positive switch unit K61+ will not face the abnormal working condition of load disconnection, further avoiding the occurrence of risks such as arcing in the main positive switch unit K61+, thereby further improving the safety of electricity use.

[0160] In some embodiments, the control module 30 can control the positive charging switch unit K62+ to be safely disconnected after the battery is fully charged. Accordingly, the control module 30 includes:

[0161] The seventeenth control unit is configured to control the auxiliary switch unit K52 to be turned on after receiving a battery charging end request instruction.

[0162] The eighteenth control unit is configured to control the semiconductor switch unit Q1 to be turned on after the auxiliary switch unit K52 is turned on and a preset time has passed.

[0163] The nineteenth control unit is used to control the positive charging switch unit K62+ to be turned off after the semiconductor switch unit Q1 is turned on.

[0164] It should be noted that if the first control switch unit includes a negative electrode control switch unit, the specific control method of the control module 30 after receiving the end charging request instruction is similar to that of the positive electrode control switch unit, and is not repeated here.

[0165] In one example, the control module 30 further includes:

[0166] The twentieth control unit is used to control the semiconductor switch unit Q1 and the auxiliary switch unit K52 to be turned off in sequence after the positive charging switch unit K62+ is turned off and a preset time has passed.

[0167] In some embodiments, to further improve safety, the control module 30 further includes a twenty-first control unit.

[0168] The twenty-first control unit is used to control the charging and negative switching unit K62- to be disconnected after the semiconductor switch unit Q1 and the auxiliary switch unit K52 are disconnected and a preset time period has passed.

[0169] In one example, the control module 30 further includes:

[0170] The twenty-second control unit is configured to diagnose the status of the semiconductor switch unit Q1 before disconnecting the main positive switch unit K61+. Specifically, if the semiconductor switch unit Q1 is in the on state, the semiconductor switch unit Q1 is determined to be normal, and the charging positive switch unit K62+ can be controlled to disconnect normally. If the semiconductor switch unit Q1 is in the off state, the fault is reported and an emergency power-off procedure is executed. In a specific example, the emergency power-off procedure may include first disconnecting the charging negative switch unit K62- and then disconnecting the charging positive switch unit K62+.

[0171] It should be noted that the twenty-second control unit can ensure that the charging switch unit K62+ will not face the abnormal working condition of load disconnection, further avoiding the occurrence of risks such as arcing in the charging switch unit K62+, thereby further improving the safety of electricity use.

[0172] In some embodiments, the control module 30 may control the first power switch unit K3+ to be turned on according to the power-on request instruction of the high-voltage electrical device. Accordingly, the control module 30 may include:

[0173] The twenty-third control unit is configured to control the auxiliary switch unit K53 to be turned on after receiving a power-on request instruction for the high-voltage component.

[0174] The twenty-fourth control unit is configured to control the semiconductor switch unit Q1 to be turned on after the auxiliary switch unit K53 is turned on and a preset time period has passed.

[0175] The twenty-fifth control unit is configured to control the first power switch unit K3+ to be turned on after the semiconductor switch unit Q1 is turned on.

[0176] It should be noted that if the first control switch unit includes a negative control switch unit, the specific control method of the control module 30 after receiving the power-on request instruction of the high-voltage electrical device is similar to that of the positive control switch unit, which will not be repeated here.

[0177] In one example, the control module 30 further includes:

[0178] A twenty-sixth control unit is configured to control the first power switch unit K3+ to be turned off after the first power switch unit K3+ is turned on and a preset time has passed.

[0179] This embodiment can avoid energy loss of the semiconductor switch unit Q1 and heat generation of the semiconductor switch unit Q1 during conduction of the first power switch unit K3+, without requiring additional thermal design and thus reducing costs.

[0180] In one example, the control module 30 further includes:

[0181] The twenty-seventh control unit is configured to diagnose the status of the semiconductor switch unit Q1 before the first power switch unit K3+ is turned on. Specifically, if the semiconductor switch unit Q1 is in the on state, the semiconductor switch unit Q1 is determined to be normal, and the charging positive switch unit K62+ can be controlled to normally turn off. If the semiconductor switch unit Q1 is in the off state, a fault is reported, and further processing is performed based on the fault type.

[0182] In some embodiments, the control module 30 may control the first power switch unit K3+ to disconnect according to the power-off request instruction of the high-voltage electrical device. Accordingly, the control module 30 may include:

[0183] The twenty-eighth control unit is configured to control the auxiliary switch unit K53 to be turned on after receiving a power-off request instruction from a high-voltage electrical device. In one example, after receiving a power-off request instruction from a high-voltage component of an automobile, the control unit controls the high-voltage component to discharge.

[0184] The twenty-ninth control unit is configured to control the semiconductor switch unit Q1 to be turned on after the auxiliary switch unit K53 is turned on and a preset time period has passed.

[0185] The 30th control unit is used to control the first power switch unit K3+ to be turned off after the semiconductor switch unit Q1 is turned on.

[0186] It should be noted that if the first control switch unit includes a negative control switch unit, the specific control method of the control module 30 after receiving the power-off request instruction of the high-voltage electrical device is similar to that of the positive control switch unit, which will not be repeated here.

[0187] In one example, the control module 30 further includes:

[0188] The thirty-first control unit is configured to control the first power consumption switch unit K3+ to be turned off after the first power consumption switch unit K3+ is turned off and a preset time duration elapses.

[0189] In one example, the control module 30 further comprises:

[0190] The thirty-second control unit is configured to perform state diagnosis on the semiconductor switch unit Q1 before the first power consumption switch unit K3+ is turned off. Specifically, if the semiconductor switch unit Q1 is in a conducting state, it is determined that the semiconductor switch unit Q1 is in a normal state, and in this case, the positive charging switch unit K62+ can be controlled to be normally turned off; if the semiconductor switch unit Q1 is in an off state, a fault is reported, and the next step is performed according to the fault type.

[0191] Figure 4 is another structural diagram of a battery high-voltage loop provided by an embodiment of the present application. As shown in Figure 4 The safety protection circuit further comprises a buffer protection module 40.

[0192] The buffer protection module 40 is connected in parallel with the semiconductor switch unit Q1, that is, one end of the buffer protection module 40 is connected to one end of the semiconductor switch unit Q1, and the other end of the buffer protection module 40 is connected to the other end of the semiconductor switch unit Q1.

[0193] The buffer protection module 40 is configured to slow down the impact of inrush current on the semiconductor switch unit Q1, that is, the semiconductor switch unit Q1 can be prevented from being damaged due to overvoltage or overcurrent. In addition, the buffer protection module 40 can consume excess energy in the circuit of the semiconductor switch unit Q1. For example, the buffer protection module 40 can be implemented as an RCD absorption circuit, or an RC buffer circuit, or a C buffer circuit, etc.

[0194] In some embodiments, the safety protection circuit can further comprise a sampling module. Alternatively, the safety protection circuit can comprise both the sampling module and the isolation module.

[0195] For example, Figure 5 is another structural diagram of a battery high-voltage loop provided by an embodiment of the present application.

[0196] As shown in Figure 5 The safety protection circuit can further comprise a sampling module 50 and an isolation module 60.

[0197] The sampling module 50 is configured to collect voltage from the other end of the semiconductor switch unit Q1.

[0198] The isolation module 60 is used to achieve electrical isolation between other components in the battery high-voltage circuit and the control module 30. In one example, the isolation module 60 can be specifically implemented as a transformer including a primary coil and a secondary coil. Alternatively, it can be implemented as a photoelectric sensor, such as an optocoupler. Alternatively, it can be implemented as a capacitor. It should be noted that the isolation module 60 can also be implemented as other isolation modules with electrical isolation functions, which is not limited in the embodiments of the present application.

[0199] At this time, the control module 30 can receive the voltage collected by the sampling module 50 through the isolation module 60, thereby realizing the monitoring of the battery high-voltage circuit and other components of the safety protection circuit. In one embodiment, when the voltage value at the sampling point is equal to the preset voltage value, it is determined that the target stage is over. For example, when the target stage is the pre-charge stage, if the first control switch unit is set on the positive transmission line, the preset voltage value can be the positive electrode voltage of the battery P1. For another example, if the first control switch unit is set on the negative transmission line, the preset voltage value can be the negative electrode voltage of the battery P1.

[0200] In this embodiment, Figure 1 The difference of the battery high-voltage circuit shown is that only one sampling module is used to monitor the voltages of multiple safety protection branches, that is, the voltage of the first safety protection branch composed of the auxiliary switch unit K51 and the semiconductor switch unit Q1, and so on, the voltage of the Nth safety protection branch composed of the auxiliary switch unit K5N and the semiconductor switch unit Q1, thereby realizing multiplexing of the sampling module 50, simplifying the circuit structure and saving circuit costs. Figure 6 This is a schematic diagram of an exemplary battery high voltage circuit provided in an embodiment of the present application. Figure 6 As shown, the sampling module 50 includes a first resistor R1 and a second resistor R2.

[0201] One end of the first resistor R1 is connected to the other end of the semiconductor switch unit Q1, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the negative electrode of the battery P1, and the other end of the first resistor R1 serves as the signal sampling point D1. Figure 6 The other end of the second resistor R2 can be connected to the negative electrode of the battery P1 through the main negative switch unit K61-.

[0202] Correspondingly, one end of the isolation module 60 is connected to the signal sampling point D1 , and the other end of the isolation module 60 is connected to the control module 30 .

[0203] In one embodiment, during the pre-charging process, the control module 30 is further configured to obtain a sampled voltage value from the signal sampling point D1 via the isolation module 60 and determine that the pre-charging process is complete when the sampled voltage value is equal to the positive electrode voltage of the battery.

[0204] Based on the same application concept, in addition to providing a safety protection circuit, the embodiment of the present application also provides a corresponding circuit control method.

[0205] The circuit control method according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0206] Figure 7 1 is a flow chart of a circuit control method provided by an embodiment of the present application. The execution body of each step of the circuit control method may be the control module 30 shown in the above part of the embodiment of the present application. Figure 7 As shown, the circuit control method 700 includes S710 and S720.

[0207] S710: Receive a target control instruction.

[0208] S720, in response to the target control instruction, enter the target stage, and in the target stage control the auxiliary switch unit corresponding to the target switch unit in the N first control switch units to be in the first on-off state, and control the semiconductor switch unit to be in the second on-off state.

[0209] The target phase includes: a pre-charging phase corresponding to the target switch unit and / or a switching phase in which the target switch unit switches between on and off states;

[0210] If the target phase includes a pre-charge phase, the first on-off state is a continuous on-state, and the second on-off state is an intermittent on-state;

[0211] If the target operating condition includes a switching phase, the first on-off state is a continuous on-state, and the second on-off state is a continuous on-state.

[0212] In some embodiments, Figure 8 This is a flow chart of another circuit control method provided in an embodiment of the present application. Figure 8 and Figure 7 The difference is that S720 includes S721 and S722.

[0213] S721 , in response to the target control instruction, entering the target phase, and controlling the auxiliary switch unit corresponding to the target switch unit to enter the first on-off state in the target phase.

[0214] S722: After the auxiliary switch unit corresponding to the target switch unit enters the first on-off state, after a preset time has passed, control the semiconductor switch unit to enter the second on-off state.

[0215] In some embodiments, Figure 9 is a flowchart of another circuit control method provided by embodiments of the present application. Figure 9 Different from Figure 7 , if the target control instruction is a control instruction for controlling the target switching unit to be turned on, the target stage includes a pre-charge stage and a switching stage, and S720 includes S723-S726 accordingly.

[0216] S723, in response to the target control instruction, entering the pre-charge stage;

[0217] S724, in the pre-charge stage, controlling the auxiliary switching unit corresponding to the target switching unit to be in a continuous conduction state, and controlling the semiconductor switching unit to be in an interval conduction state;

[0218] S725, in the case where a pre-charge stop condition is met, entering the switching stage. In one example, the pre-charge stop condition can include that the voltage value of the other end of the target switching unit approaches the voltage value of the battery and the current value in the pre-charge loop approaches zero.

[0219] S726, in the switching stage, controlling the auxiliary switching unit corresponding to the target switching unit to be in a continuous conduction state, and controlling the semiconductor switching unit to be in a continuous conduction state.

[0220] In some embodiments, the target control instruction is at least one of a power-on request instruction of the electric device, a charging request instruction of the battery, and a power-on request instruction of the high-voltage electric device;

[0221] If the target control instruction includes the power-on request instruction of the electric device, the target switching unit includes the main positive switching unit and / or the main negative switching unit. Wherein, if the auxiliary switching unit includes the auxiliary switching unit corresponding to the main positive switching unit, the target switching unit can include the main positive switching unit when the power-on request instruction is received. Similarly, if the auxiliary switching unit includes the auxiliary switching unit corresponding to the main negative switching unit, the target switching unit can include the main negative switching unit when the power-on request instruction is received.

[0222] If the target control instruction includes the charging request instruction of the battery, the target switching unit includes the charge positive switching unit and / or the charge negative switching unit. Wherein, if the auxiliary switching unit includes the auxiliary switching unit corresponding to the charge positive switching unit, the target switching unit can include the charge positive switching unit when the charging request instruction is received. Similarly, if the auxiliary switching unit includes the auxiliary switching unit corresponding to the charge negative switching unit, the target switching unit can include the charge negative switching unit when the charging request instruction is received.

[0223] If the target control instruction includes a power-on request instruction for a high-voltage electrical device, the target switch unit includes the first power switch unit and / or the second power switch unit. Specifically, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the first power switch unit, then upon receiving the power-on request instruction for the high-voltage electrical device, the target switch unit may include the first power switch unit. Similarly, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the second power switch unit, then upon receiving the power-on request instruction for the high-voltage electrical device, the target switch unit may include the second power switch unit.

[0224] In some embodiments, if the target control instruction is a control instruction for controlling the target switch unit to be disconnected, the target control instruction includes at least one of: a power-off request instruction for an electrical device, a battery charge termination request instruction, and a power-off request instruction for a high-voltage electrical device;

[0225] If the target control instruction includes a power-off request instruction for an electrical device, the target switch unit includes a main positive switch unit and / or a main negative switch unit. If the auxiliary switch unit includes an auxiliary switch unit corresponding to the main positive switch unit, then upon receiving the power-off request instruction from the electrical device, the target switch unit may include the main positive switch unit. Similarly, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the main negative switch unit, then upon receiving the power-off request instruction from the electrical device, the target switch unit may include the main negative switch unit.

[0226] If the target control instruction includes a battery charge termination request instruction, the target switch unit includes a positive charge switch unit and / or a negative charge switch unit. If the auxiliary switch unit includes an auxiliary switch unit corresponding to the positive charge switch unit, then upon receiving the charge termination request instruction, the target switch unit may include the positive charge switch unit. Similarly, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the negative charge switch unit, then upon receiving the charge termination request instruction, the target switch unit may include the negative charge switch unit.

[0227] If the target control instruction includes a power-off request instruction for a high-voltage electrical device, the target switch unit includes the first power switch unit and / or the second power switch unit. Specifically, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the first power switch unit, then upon receiving the power-off request instruction for the high-voltage electrical device, the target switch unit may include the first power switch unit. Similarly, if the auxiliary switch unit includes an auxiliary switch unit corresponding to the second power switch unit, then upon receiving the power-off request instruction for the high-voltage electrical device, the target switch unit may include the second power switch unit.

[0228] In some embodiments, Figure 10 This is a flow chart of another circuit control method provided in an embodiment of the present application. Figure 10 Unlike Figure 7 The method 700 further includes S730 after S720.

[0229] S730, after the target phase ends, controlling the auxiliary switch unit corresponding to the target switch unit to be in a persistent off state, and controlling the semiconductor switch unit to be in a persistent off state.

[0230] Other details of the circuit control method according to the embodiments of the present application are similar to the safety protection circuit described in the above examples, and can achieve the corresponding technical effects. For brevity, they will not be described here. Figures 2 to 6

[0231] A hardware structure schematic diagram of the circuit control device provided by the embodiments of the present application is shown. Figure 11 The circuit control device can include a processor 1101 and a memory 1102 storing computer program instructions.

[0232] Specifically, the processor 1101 described above can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured as one or more integrated circuits that implement the embodiments of the present application.

[0233] The memory 1102 can include a mass storage for data or instructions. By way of example and not limitation, the memory 1102 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In some examples, the memory 1102 can include a removable or non-removable (or fixed) medium, or the memory 1102 is a non-volatile solid state memory. In some embodiments, the memory 1102 can be internal or external to the circuit control device.

[0234] In some examples, the memory 1102 can be a read only memory (ROM). In one example, the ROM can be a mask programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0235]

[0236] ​The memory 1102 can include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software that, when executed (e.g., by one or more processors), is operable to perform the operations described with reference to the methods according to an aspect of the present disclosure.

[0237] The processor 1101 implements the methods, functions Figure 7-10 described in the embodiments by reading and executing computer program instructions stored in the memory 1102. Figure 7-10 The corresponding technical effects achieved by the examples described above are not repeated here for brevity.

[0238] In one example, the circuit control device can further include a communication interface 1103 and a bus 1110. Wherein, as Figure 11 shown, the processor 1101, the memory 1102, the communication interface 1103 are connected through the bus 1110 and complete the communication between each other.

[0239] The communication interface 1103 is mainly used to realize the communication between each module, device, unit and / or equipment in the embodiments of the present application.

[0240] The bus 1110 includes hardware, software or both to couple components of the online data traffic billing device to each other in a known manner. By way of example, and not limitation, the bus can include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association local (VLB) bus, or another suitable bus or a combination of two or more of these. Where appropriate, the bus 1110 can include one or more buses. Although the present embodiments describe and show a particular bus, the present application contemplates any suitable bus or interconnect.

[0241] The circuit control device can execute the circuit control method in the embodiment of the present invention, thereby realizing the combination Figures 2 to 10 The circuit control method and device are described.

[0242] In addition, in conjunction with the circuit control method in the above embodiments, embodiments of the present invention may provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the circuit control methods in the above embodiments is implemented.

[0243] It should be understood that the present invention is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted. In the above embodiments, several specific steps are described and illustrated as examples. However, the method of the present invention is not limited to the specific steps described and illustrated. Those skilled in the art may make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present invention.

[0244] The functional blocks shown in the above structured block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in unit, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0245] It should also be noted that the exemplary embodiments described herein describe methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the steps described above. In other words, the steps may be performed in the order described in the embodiments, or in a different order, or several steps may be performed simultaneously.

[0246] Aspects of the present disclosure have been described above with reference to the flowcharts and / or block diagrams of the methods, devices, equipment, and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0247] The above is only a specific embodiment of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

[0248] The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited to this. Any technician familiar with this technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of this application.

[0249] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A safety protection circuit, characterized in that: include: N auxiliary switch units, each corresponding one-to-one to each of the N first control switch units, wherein the N first control switch units are arranged on a power transmission line of the battery, N is an integer greater than or equal to 2, and the N auxiliary switch units are mechanical switches; a semiconductor switch unit, wherein the semiconductor switch unit is connected in parallel with the first control switch unit corresponding to each auxiliary switch unit through each auxiliary switch unit; a control module configured to receive a target control instruction; enter a target phase in response to the target control instruction; and in the target phase, control an auxiliary switch unit corresponding to a target switch unit among the N first control switch units to be in a first on-off state, and control the semiconductor switch unit to be in a second on-off state; The target phase includes: a pre-charging phase corresponding to the target switch unit and / or a switching phase in which the target switch unit switches between on and off states; If the target phase includes the pre-charge phase, the first on-off state is a continuous on-state, and the second on-off state is an intermittent on-state; If the target operating condition includes the switching stage, the first on-off state is a continuous on-state, and the second on-off state is a continuous on-state; the control module is configured to: in the switching stage, first control the semiconductor switch unit and the auxiliary switch unit corresponding to the target switch unit to enter the continuous on-state, and then control the target switch unit to switch from the off state to the on state, or from the on state to the off state.

2. The circuit according to claim 1, wherein: The circuit further comprises: A buffer protection module is connected in parallel with the semiconductor switch unit.

3. The circuit according to claim 1, wherein: The power transmission line of the battery includes: a positive power transmission line of the battery and / or a negative power transmission line of the battery; If the power transmission line of the battery includes a positive power transmission line of the battery, the N first control switch units include at least two of a main positive switch unit, a charging positive switch unit, and a first power switch unit; If the power transmission line of the battery includes a negative power transmission line of the battery, the N first control switch units include at least two of a main negative switch unit, a charging negative switch unit, and a second power switch unit; It is characterized in that one end of the main positive switch unit is connected to the positive electrode of the battery, and the other end of the main positive switch unit is connected to the positive electrode connection port of the motor; One end of the positive charging switch unit is connected to the positive electrode of the battery, and the other end of the positive charging switch unit is connected to the positive charging port; One end of the first power switch unit is connected to the positive electrode of the battery, and the other end of the first power switch unit is connected to the high-voltage output port; One end of the main negative switch unit is connected to the negative electrode of the battery, and the other end of the main negative switch unit is connected to the negative electrode connection port of the motor; One end of the charge-negative switch unit is connected to the negative electrode of the battery, and the other end of the charge-negative switch unit is connected to the negative electrode charging port; One end of the second power switch unit is connected to the negative electrode of the battery, and the other end of the power switch unit is connected to the high-voltage output port.

4. A circuit control method, said method being applied to the safety protection circuit according to any one of claims 1 to 3, characterized in that: The method comprises: The control module receives a target control instruction; The control module enters a target phase in response to the target control instruction, and in the target phase controls the auxiliary switch unit corresponding to the target switch unit among the N first control switch units to be in a first on-off state, and controls the semiconductor switch unit to be in a second on-off state; Characterized in that, the target phase includes: a pre-charging phase corresponding to the target switch unit and / or a switching phase in which the target switch unit switches between on and off states; If the target phase includes the pre-charge phase, the first on-off state is a continuous on-state, and the second on-off state is an intermittent on-state; If the target operating condition includes the switching stage, the first on-off state is a continuous on-state, and the second on-off state is a continuous on-state; in the switching stage, the semiconductor switch unit and the auxiliary switch unit corresponding to the target switch unit are first controlled to enter the continuous on-state, and then the target switch unit is controlled to switch from the off-state to the on-state, or from the on-state to the off-state.

5. The method according to claim 4, characterized in that After the control module controls the auxiliary switch unit corresponding to the target switch unit in the N first control switch units to be in the first on-off state, and controls the semiconductor switch unit to be in the second on-off state, the method further includes: After the target phase ends, the control module controls the auxiliary switch unit corresponding to the target switch unit to be in a continuously disconnected state, and controls the semiconductor switch unit to be in a continuously disconnected state.

6. The method according to claim 4, characterized in that The control module controls the auxiliary switch unit corresponding to the target switch unit in the N first control switch units to be in a first on-off state, and controls the semiconductor switch unit to be in a second on-off state, including: The control module controls the auxiliary switch unit corresponding to the target switch unit to enter a first on-off state; The control module controls the semiconductor switch unit to enter the second on-off state after a preset time period has passed since the auxiliary switch unit corresponding to the target switch unit enters the first on-off state.

7. The method according to claim 4, characterized in that If the target control instruction is a control instruction for controlling the target switch unit to be turned on, the target phase includes: the pre-charge phase and the switching phase; The control module enters a target phase in response to the target control instruction, and controls the auxiliary switch unit corresponding to the target switch unit among the N first control switch units to be in a first on-off state, and controls the semiconductor switch unit to be in a second on-off state in the target phase, including: The control module enters the pre-charging phase in response to the target control instruction; The control module controls the auxiliary switch unit corresponding to the target switch unit to be in a continuously conducting state, and controls the semiconductor switch unit to be in an intermittently conducting state during the pre-charging stage; The control module enters the switching phase when the pre-charging stop condition is met; During the switching phase, the control module controls the auxiliary switch unit corresponding to the target switch unit to be in a continuously on state, and controls the second on-off state to be in a continuously on state.

8. The method according to claim 7, characterized in that The target control instruction is at least one of a power-on request instruction of an electric device, a charge request instruction of the battery, and a power-on request instruction of a high-voltage electric device; If the target control instruction includes a power-on request instruction for the electrical device, the target switch unit includes a main positive switch unit and / or a main negative switch unit; If the target control instruction includes a charge request instruction for the battery, the target switch unit includes a positive charge switch unit and / or a negative charge switch unit; If the target control instruction includes a power-on request instruction for the high-voltage electrical device, the target switch unit includes a first power switch unit and / or a second power switch unit.

9. The method according to claim 4, characterized in that If the target control instruction is a control instruction for controlling the target switch unit to be disconnected, the target control instruction includes at least one of: a power-off request instruction for an electrical device, a charge termination request instruction for the battery, and a power-off request instruction for a high-voltage electrical device; If the target control instruction includes a power-off request instruction for the electrical device, the target switch unit includes a main positive switch unit and / or a main negative switch unit; If the target control instruction includes a charge termination request instruction for the battery, the target switch unit includes a positive charge switch unit and / or a negative charge switch unit; If the target control instruction includes a power-off request instruction for a high-voltage electrical device, the target switch unit includes a first power switch unit and / or a second power switch unit.

10. A battery high voltage circuit, characterized in that: include: The safety protection circuit according to any one of claims 1 to 3; And, a first control switch unit is characterized in that the first control switch unit is arranged on the power transmission line of the battery.

11. An electrical device, characterized in that: The electrical device comprises: The safety protection circuit according to any one of claims 1 to 3; and, a first control switch unit, characterized in that the first control switch unit is arranged on a power transmission line of the battery; and batteries.

12. A circuit control device, characterized in that: The device includes: a processor and a memory storing computer program instructions; The processor reads and executes the computer program instructions to implement the circuit control method according to any one of claims 4 to 9.

13. A computer storage medium, characterized in that The computer storage medium stores computer program instructions, which, when executed by a processor, implement the circuit control method according to any one of claims 4 to 9.

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