Bleep control circuit, bleep system, vehicle, and bleep control method

Abstract

The invention relates to a discharge control circuit, a discharge system, a vehicle and a discharge control method. The discharge control circuit comprises a discharge interruption module; and the discharge interruption module is used for being electrically connected with the discharge circuit, detecting the discharge state of the discharge circuit, and controlling the discharge circuit to be disconnected when the discharge state represents that the discharge circuit has abnormal continuous discharge, so that the discharge circuit stops discharge. According to the invention, interruption control can be carried out in time when abnormal continuous discharge occurs, energy is not wasted, the risk of burnout of the discharge circuit is reduced, and serious accidents such as fire are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a discharge control circuit, a discharge system, a vehicle, and a discharge control method. Background Art

[0002] Motor control, power conversion, and other circuits require high-voltage bus capacitors for energy storage and filtering. Under normal circumstances, when the system is in an emergency shutdown or rapid switching state, the high-voltage bus capacitors need to be quickly discharged. This is often achieved by using a discharge circuit connected in parallel with the high-voltage bus capacitors. The discharge circuit can be turned on when the high-voltage bus capacitors need to be discharged, forming a corresponding discharge circuit to complete the discharge operation.

[0003] However, when the system encounters abnormal conditions such as discharge drive failure or failure of the high-voltage busbar to disconnect, the discharge circuit will experience abnormal and continuous discharge. If the discharge continues, it will not only waste energy, but also easily burn the discharge circuit, and may even cause serious accidents such as fire. Summary of the Invention

[0004] Embodiments of the present application provide a discharge control circuit, a discharge system, a vehicle, and a discharge control method. A discharge interruption module is provided. The discharge interruption module can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect, so that the discharge circuit stops discharging, thereby at least partially solving the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a discharge control circuit is provided, comprising a discharge interruption module;

[0006] The discharge interrupt module is used to be electrically connected to the discharge circuit, and is used to detect the discharge state of the discharge circuit, and control the discharge circuit to be disconnected when the discharge state indicates that the discharge circuit has abnormal continuous discharge, so that the discharge circuit stops discharging.

[0007] Optionally, the discharge interruption module includes a control switch and a switch control unit;

[0008] The controlled end of the control switch is electrically connected to the output end of the switch control unit, the first access end of the control switch is used to be electrically connected to the controlled end of the discharge circuit, the second access end of the control switch is used to be grounded or used to be connected to the working voltage, and the input end of the switch control unit is used to be electrically connected to the discharge circuit;

[0009] The switch control unit is used to detect the discharge state of the discharge circuit and output a target control signal to the control switch when the discharge state indicates that the discharge circuit has abnormal and continuous discharge, so as to turn on the control switch so that the controlled end of the discharge circuit is connected to the discharge drive signal indicating that the discharge circuit is disconnected.

[0010] Optionally, the discharge interruption module includes a control switch and a switch control unit;

[0011] The controlled end of the control switch is electrically connected to the output end of the switch control unit, the first access end and the second access end of the control switch are used to be connected in series in the discharge circuit, and the input end of the switch control unit is used to be electrically connected to the discharge circuit;

[0012] The switch control unit is used to detect the discharge state of the discharge circuit and output a target control signal to the control switch when the discharge state indicates that the discharge circuit has abnormal and continuous discharge, so as to disconnect the discharge circuit by disconnecting the control switch.

[0013] Optionally, the first input terminal of the switch control unit is used to be electrically connected to a first detection node in the discharge circuit, and the second input terminal of the switch control unit is used to be electrically connected to a second detection node in the discharge circuit;

[0014] The switch control unit is used to detect a target pressure difference between the first detection node and the second detection node, and output a target control signal to the control switch when the target pressure difference indicates that the discharge circuit has abnormal and continuous discharge.

[0015] Optionally, the first input terminal of the switch control unit is used to be electrically connected to the first terminal of the bleeder resistor in the bleeder circuit, and the second input terminal of the switch control unit is used to be electrically connected to the second terminal of the bleeder resistor;

[0016] The switch control unit is used to detect the resistance voltage difference across the discharge resistor and output a target control signal to the control switch when the resistance voltage difference is greater than a preset voltage difference and lasts longer than a preset time; the target voltage difference includes the resistance voltage difference.

[0017] Optionally, the switch control unit includes an XOR gate and a delay subunit;

[0018] The first input end of the XOR gate is used to be electrically connected to the first end of the discharge resistor, the second input end of the XOR gate is used to be electrically connected to the second end of the discharge resistor, the output end of the XOR gate is electrically connected to the input end of the delay subunit, and the output end of the delay subunit is electrically connected to the controlled end of the control switch.

[0019] Optionally, the switch control unit further includes a latch and an inverter;

[0020] The input end of the inverter is electrically connected to the output end of the delay subunit, the output end of the inverter is electrically connected to the first input end of the latch, the second input end of the latch is used to access the discharge control signal, and the output end of the latch is electrically connected to the controlled end of the control switch.

[0021] Optionally, the switch control unit further includes an OR gate;

[0022] The first input end of the OR gate is electrically connected to the output end of the delay subunit and the input end of the inverter respectively, the second input end of the OR gate is used to access the discharge control signal, and the output end of the OR gate is electrically connected to the second input end of the latch.

[0023] Optionally, the discharge control circuit further includes a discharge drive module;

[0024] The input terminal of the discharge drive module is used to receive the discharge control signal;

[0025] The output end of the discharge driving module is used to be electrically connected to the controlled end of the discharge circuit, and is used to output a discharge driving signal to the discharge circuit according to the input discharge control signal.

[0026] Optionally, the discharge control circuit further includes a filtering module;

[0027] The first end of the filter module is electrically connected to the input end of the discharge driving module, and the second end of the filter module is used for grounding;

[0028] The filter module is used to filter the discharge control signal connected to the discharge drive module.

[0029] Optionally, the filter module includes a filter capacitor and a filter resistor;

[0030] The first end of the filter capacitor is electrically connected to the first end of the filter resistor and the input end of the discharge driving module respectively, and the second end of the filter capacitor and the second end of the filter resistor are used for grounding respectively.

[0031] According to a second aspect of the present application, a discharge system is provided, comprising a discharge circuit and the discharge control circuit in any one of the above embodiments;

[0032] The discharge circuit is connected in parallel with the bus capacitor and is used to discharge the energy on the bus capacitor.

[0033] According to a third aspect of the present application, a vehicle is provided, comprising the discharge system in any one of the above embodiments.

[0034] According to a fourth aspect of the present application, a discharge control method is provided, which is applied to the discharge control circuit in any of the above embodiments. The discharge control method includes:

[0035] The discharge interruption module detects the discharge state of the discharge circuit and controls the discharge circuit to be disconnected when the discharge state indicates that the discharge circuit is abnormally and continuously discharging, so that the discharge circuit stops discharging.

[0036] The discharge control circuit of the embodiment of the present application is provided with a discharge interruption module. The discharge interruption module can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect so that the discharge circuit stops discharging. The interruption control can be performed in time when abnormal continuous discharge occurs, which does not waste energy, reduces the risk of burning the discharge circuit, and avoids serious accidents such as fire.

[0037] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0039] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0040] Figure 1 is a schematic diagram of a relief system provided in an exemplary embodiment of the present application;

[0041] Figure 2 1 is a schematic diagram of a discharge interruption module in a discharge system provided in an exemplary embodiment of the present application, including a switch control unit and a control switch;

[0042] Figure 3 is a schematic diagram of a discharge control circuit provided in an exemplary embodiment of the present application further including a filtering module;

[0043] Figure 4 is a schematic diagram of a specific circuit implementation of a discharge system provided in an exemplary embodiment of the present application;

[0044] Figure 5 It is a schematic flow chart of the main discharge operation provided in an exemplary embodiment of the present application;

[0045] Figure 6 is a schematic diagram of a specific circuit implementation of a discharge system in which the switch control unit provided in an exemplary embodiment of the present application further includes a latch and an inverter;

[0046] Figure 7 1 is a schematic diagram of a specific circuit implementation of a discharge system in which the switch control unit provided in an exemplary embodiment of the present application further includes an OR gate;

[0047] Figure 8It is a flowchart of the detection and protection work provided in the exemplary embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0049] According to the first aspect of this application, Figure 1 As shown, a discharge control circuit 100 is provided, including a discharge interruption module 110 .

[0050] Among them, the discharge interrupt module 110 is used to be electrically connected to the discharge circuit 200, used to detect the discharge state of the discharge circuit 200, and control the discharge circuit 200 to be disconnected when the discharge state indicates that the discharge circuit 200 has abnormal continuous discharge, so that the discharge circuit 200 stops discharging.

[0051] Among them, when the discharge circuit 200 is performing a discharge operation, its corresponding loop is turned on, there is current in the loop, and a corresponding voltage difference is generated when the current passes through the corresponding impedance, so that the discharge interrupt module 110 can determine whether the discharge circuit 200 is performing a discharge operation by detecting the on-off, current and / or pressure difference of the discharge circuit 200.

[0052] Furthermore, to ensure energy consumption and safety, the duration of the discharge operation can be limited to a reasonable range. When the discharge interruption module 110 detects that the discharge operation duration of the discharge circuit 200 exceeds the limited reasonable range, it indicates that if the discharge circuit 200 continues to discharge, it will significantly affect energy consumption and safety. The discharge circuit 200 can be further determined to be abnormally continuously discharging, and the discharge operation of the discharge circuit 200 can be interrupted. Similarly, when the discharge interruption module 110 detects that the discharge operation duration of the discharge circuit 200 does not exceed the limited reasonable range, it indicates that if the discharge circuit 200 continues to discharge, it will not significantly affect energy consumption and safety. The discharge operation of the discharge circuit 200 can be further determined to be abnormally continuously discharging, and the discharge operation of the discharge circuit 200 can be maintained.

[0053] The discharge operation of the discharge circuit 200 is based on the conduction of the corresponding loop. Therefore, the discharge interruption module 110 can interrupt the discharge operation by controlling the discharge circuit 200 to be disconnected.

[0054] Specifically, the discharge circuit 200 can control its own on and off by the connected discharge drive signal drive, so the discharge interruption module 110 can realize the discharge interruption of the discharge circuit 200 by controlling the discharge drive signal drive connected to the discharge circuit 200; the discharge interruption module 110 can also directly use the switching device connected in series in the discharge circuit 200 to directly control the on and off of the discharge circuit 200 to realize the discharge interruption of the discharge circuit 200.

[0055] The discharge control circuit of the embodiment of the present application is provided with a discharge interruption module. The discharge interruption module can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect so that the discharge circuit stops discharging. The interruption control can be performed in time when abnormal continuous discharge occurs, which does not waste energy, reduces the risk of burning the discharge circuit, and avoids serious accidents such as fire.

[0056] like Figure 1 As shown, optionally, the discharge control circuit 100 further includes a discharge driving module 120 .

[0057] Among them, the input end of the discharge driving module 120 is used to receive the discharge control signal ctrl, and the output end of the discharge driving module 120 is used to be electrically connected to the controlled end of the discharge circuit 200, and is used to output the discharge driving signal drive to the discharge circuit 200 according to the received discharge control signal ctrl.

[0058] Among them, when the input end of the discharge driving module 120 is connected to the discharge control signal ctrl representing the execution of discharge, the output end of the discharge driving module 120 outputs the discharge driving signal drive representing conduction to the controlled end of the discharge circuit 200, so that the discharge circuit 200 is turned on and performs the corresponding discharge operation; similarly, when the input end of the discharge driving module 120 is connected to the discharge control signal ctrl representing the stop of discharge, the output end of the discharge driving module 120 outputs the discharge driving signal drive representing disconnection to the controlled end of the discharge circuit 200, so that the discharge circuit 200 is disconnected and stops the corresponding discharge operation.

[0059] When a driving failure occurs in the discharge driving module 120 , the discharge driving module 120 abnormally and continuously outputs a discharge driving signal drive indicating conduction to the discharge circuit 200 , thereby causing the discharge circuit 200 to abnormally and continuously discharge.

[0060] The discharge drive module 120 is controlled by a superior controller. When a program error occurs in the superior controller, the controller may abnormally and continuously output a discharge control signal ctrl indicating discharge execution to the discharge drive module 120. This may cause the discharge drive module 120 (which is not at fault) to abnormally and continuously output a discharge drive signal drive indicating conduction to the discharge circuit 200, causing the discharge circuit 200 to abnormally and continuously discharge.

[0061] Among them, the upper-level controller usually controls the discharge based on the feedback of the bus voltage. When the high-voltage bus is not disconnected, the controller will continue to detect the bus voltage that meets the discharge requirements. This causes the controller that has not experienced program failure to abnormally continue to output the discharge control signal ctrl representing the discharge execution to the discharge drive module 120, which in turn causes the discharge drive module 120 that has not failed to abnormally continue to output the discharge drive signal drive representing conduction to the discharge circuit 200, causing the discharge circuit 200 to abnormally continue to discharge.

[0062] like Figure 2 As shown, optionally, the discharge interruption module 110 includes a control switch 112 and a switch control unit 111 .

[0063] Among them, the controlled end of the control switch 112 is electrically connected to the output end of the switch control unit 111, the first access end of the control switch 112 is used to be electrically connected to the controlled end of the discharge circuit 200, the second access end of the control switch 112 is used to be grounded, and the input end of the switch control unit 111 is used to be electrically connected to the discharge circuit 200.

[0064] The switch control unit 111 is used to detect the discharge state of the discharge circuit 200, and output a target control signal to the control switch 112 when the discharge state indicates that the discharge circuit 200 is abnormally and continuously discharging, so as to turn on the control switch 112 so that the controlled end of the discharge circuit 200 is connected to the discharge drive signal indicating that the discharge circuit 200 is disconnected.

[0065] The above embodiments have described in detail how the discharge interrupt module 110 detects the discharge state of the discharge circuit 200 and determines whether abnormal continuous discharge occurs. Therefore, in this embodiment, the switch control unit 111 can adopt the same method, which will not be repeated here.

[0066] Taking high and low levels as an example, if the discharge circuit 200 is turned on when a high-level discharge drive signal drive is connected to its controlled end and is turned off when a low-level discharge drive signal drive is connected to it, then the control switch 112 needs to be turned on when a target control signal is connected to its controlled end to pull the discharge drive signal drive low, thereby turning off the discharge circuit 200; further, if the controlled end of the control switch 112 is turned on when a high-level target control signal is connected to it and is turned off when a low-level target control signal is connected to it, then the switch control unit 111 needs to output a high-level target control signal to the controlled end of the control switch 112 when it detects that the discharge circuit 200 has abnormal continuous discharge.

[0067] The second input terminal of the control switch 112 can also be used to input an operating voltage, and the switch control unit 111 is further configured to output a target control signal to the control switch 112, so that the controlled terminal of the discharger circuit 200 receives a discharge drive signal indicating that the discharger circuit 200 is disconnected. Still taking the high and low levels as an example, if the discharger circuit 200 is turned on when its controlled terminal receives a low-level discharge drive signal drive and is disconnected when it receives a high-level discharge drive signal drive, the control switch 112 needs to be turned on when its controlled terminal receives the target control signal to pull the discharge drive signal drive high, thereby disconnecting the discharger circuit 200. Furthermore, if the controlled terminal of the control switch 112 is turned on when it receives a high-level target control signal and is disconnected when it receives a low-level target control signal, the switch control unit 111 needs to output a high-level target control signal to the controlled terminal of the control switch 112 when detecting abnormal continuous discharge of the discharger circuit 200.

[0068] Optionally, the discharge interruption module includes a control switch and a switch control unit.

[0069] The controlled end of the control switch is electrically connected to the output end of the switch control unit. The first access end and the second access end of the control switch are used to be connected in series in the discharge circuit. The input end of the switch control unit is used to be electrically connected to the discharge circuit.

[0070] The switch control unit is used to detect the discharge state of the discharge circuit and output a target control signal to the control switch when the discharge state indicates that the discharge circuit has abnormal and continuous discharge, so as to disconnect the discharge circuit by disconnecting the control switch.

[0071] In the above embodiment, it has been mentioned that a control switch can be provided to control the discharge drive signal connected to the controlled end of the discharge circuit. In this embodiment, the control switch can be directly connected in series with the discharge circuit. When the switch control unit detects that the discharge circuit has abnormal and continuous discharge, it outputs a target control signal to the control switch to directly disconnect the discharge circuit through the control switch.

[0072] It should be noted that since the discharge circuit is a high-voltage environment, if the control switch is set in series in the discharge circuit, this requires the control switch to have corresponding voltage resistance, and the switch control unit needs to have corresponding driving capability.

[0073] Optionally, the first input terminal of the switch control unit is used to be electrically connected to a first detection node in the discharge circuit, and the second input terminal of the switch control unit is used to be electrically connected to a second detection node in the discharge circuit;

[0074] The switch control unit is used to detect a target pressure difference between the first detection node and the second detection node, and output a target control signal to the control switch when the target pressure difference indicates that the discharge circuit has abnormal and continuous discharge.

[0075] The above embodiments have mentioned that the on / off state, voltage difference, and current of the bleeder circuit can be detected. In this embodiment, the voltages of the first detection node and the second detection node can be detected to determine the target voltage difference between them. The bleeder circuit can be composed of a bleeder resistor and a bleeder switch connected in series. The target voltage difference can reflect the voltage drop when current flows through the bleeder resistor or whether the switch device is conductive.

[0076] Specifically, when the first detection node and the second detection node are the first and second access terminals of a discharge switch, if the discharge switch is on, the corresponding detected target voltage difference is the bus voltage; if the discharge switch is off, the corresponding detected target voltage difference is substantially zero. Based on the substantially zero target voltage difference and the duration, if the duration is greater than a preset time, it can be determined that the discharge circuit is experiencing abnormal and continuous discharge.

[0077] Optionally, the first input terminal of the switch control unit is used to be electrically connected to the first terminal of the bleeder resistor in the bleeder circuit, and the second input terminal of the switch control unit is used to be electrically connected to the second terminal of the bleeder resistor.

[0078] The switch control unit is used to detect the resistance voltage difference across the discharge resistor and output a target control signal to the control switch when the resistance voltage difference is greater than a preset voltage difference and lasts longer than a preset time; the target voltage difference includes the resistance voltage difference.

[0079] Among them, the above embodiment has mentioned that the discharge state of the discharge circuit can be determined by detecting the on and off of the discharge switch. However, it should be noted that when the energy on the bus capacitor has been discharged, if the discharge switch is still in conduction, although the corresponding discharge circuit can be formed, the discharge operation will not continue, so there will be no significant impact on energy waste and safety. If this situation is determined to be abnormal continuous discharge, it will reduce the accuracy of detection. Therefore, to address this problem, this embodiment specifically targets the discharge resistor in the discharge circuit and detects the target voltage difference across the discharge resistor. When the target voltage difference is greater than the preset voltage difference, it means that the discharge circuit is not only formed, but also that the discharge operation is occurring, thereby improving the accuracy of detection.

[0080] In one embodiment, the switch control unit may include a current transformer, so as to use the current transformer to detect the current in the discharge circuit. If the detected target current is greater than the preset current, it means that the discharge circuit is not only formed, but also a discharge operation exists, which can also improve the accuracy of detection.

[0081] like Figure 3 As shown, optionally, the discharge control circuit 100 further includes a filtering module 130 .

[0082] The first end of the filter module 130 is electrically connected to the input end of the discharge driving module 120 , and the second end of the filter module 130 is grounded.

[0083] The filtering module 130 is configured to filter the discharge control signal ctrl received by the discharge driving module 120 .

[0084] The filtering module 130 can prevent noise signals from being mixed into the discharge control signal ctrl, thereby preventing the control accuracy of the discharge driving module 120 from being affected.

[0085] like Figure 4 As shown, optionally, the discharge drive module includes a drive chip drive IC, the filter module includes a filter capacitor C1 and a filter resistor R3, and the discharge circuit includes a second MOS tube Q2 as a discharge switch and a discharge resistor R5.

[0086] The first end of the filter capacitor C1 is electrically connected to the first end of the filter resistor R3 and the input end of the drive IC, respectively. The second end of the filter capacitor C1 and the second end of the filter resistor R3 are grounded, respectively.

[0087] Among them, Figure 5As shown, when the driver chip U3 is connected to the high-level discharge control signal ctrl representing the discharge execution through the terminal Iuput, the high-level discharge control signal ctrl continuously charges the filter capacitor C1. When the voltage value on the filter capacitor C1 reaches the driving condition of the driver chip U3, the driver chip U3 outputs the high-level discharge drive signal drive, the second MOS transistor Q2 is turned on, and the discharge circuit performs a discharge operation to discharge the energy on the bus capacitor HV-CAP. Similarly, when the driver chip U3 is connected to the low-level discharge control signal ctrl representing the discharge stop through the terminal Iuput, the low-level discharge control signal ctrl stops charging the filter capacitor C1, and the energy on the filter capacitor C1 is discharged through the filter resistor R3. When the voltage value on the filter capacitor C1 cannot reach the driving condition of the driver chip U3, the driver chip U3 outputs the low-level discharge drive signal drive, the second MOS transistor Q2 is turned off, and the discharge circuit stops the discharge operation, indicating that the energy on the bus capacitor HV-CAP has been completely discharged or the energy is less and no longer needs to be discharged.

[0088] like Figure 4 As shown, optionally, the switch control unit includes an XOR gate U1 and a delay sub-unit U2, and the control switch includes a first MOS transistor Q1.

[0089] Among them, the first input end of the XOR gate U1 is used to be electrically connected to the first end of the bleeder resistor R5, the second input end of the XOR gate U1 is used to be electrically connected to the second end of the bleeder resistor R5, the output end of the XOR gate U1 is electrically connected to the input end of the delay sub-unit U2, and the output end of the delay sub-unit U2 is electrically connected to the gate of the first MOS transistor Q1.

[0090] When the target voltage difference across the bleeder resistor R5 is greater than the preset voltage difference, the first and second input terminals of the XOR gate U1 are connected to different voltage values, causing the output terminal of the XOR gate U1 to output a high level, thereby connecting the input terminal of the delay sub-unit U2 to a high level. When the target voltage difference across the bleeder resistor R5 is greater than the preset voltage difference and lasts longer than a preset time, the delay sub-unit U2 reaches a delay trigger condition, causing the output terminal of the delay sub-unit U2 to output a high level to the gate of the first MOS transistor Q1, thereby turning on the first MOS transistor Q1 and pulling down the gate voltage of the second MOS transistor Q2. The gate of the second MOS transistor Q2 is connected to a low-level discharge drive signal drive, turning off the second MOS transistor Q2, and disconnecting the discharge circuit.

[0091] like Figure 6 As shown, optionally, the switch control unit further includes a latch U4 and an inverter U5.

[0092] Among them, the input end of the inverter U5 is electrically connected to the output end of the delay sub-unit U2, the output end of the inverter U5 is electrically connected to the first input end S of the latch U4, the second input end R of the latch U4 is used to receive the discharge control signal ctrl, and the output end Q of the latch U4 is electrically connected to the gate of the first MOS transistor Q1.

[0093] Among them, the latch U4 can output a high level through the output terminal R when the first input terminal S is connected to a low level and the second input terminal R is connected to a high level. The latch U4 can also output a low level through the output terminal R when the first input terminal S is connected to a high level and the second input terminal R is connected to a low level.

[0094] Specifically, when there is abnormal continuous discharge and the upper controller issues a discharge execution instruction, the delay subunit U2 outputs a high level and the discharge control signal ctrl is a high level indicating discharge, so that the input end of the inverter U5 is connected to a high level and the second input end R of the latch U4 is connected to a high level. After the inversion of the inverter U5, the first input end S of the latch U4 is connected to a low level, so that the output end Q of the latch U4 outputs a high level, the first MOS tube Q1 is turned on, the second MOS tube Q2 is connected to the low-level discharge drive signal drive, the second MOS tube Q2 is turned off, and the discharge circuit stops discharging. Similarly, when the abnormal continuous discharge disappears and the superior controller issues an instruction to stop the discharge, the delay subunit U2 outputs a low level and the discharge control signal ctrl is a low level representing the discharge, so that the input end of the inverter U5 is connected to the low level and the second input end R of the latch U4 is connected to the low level. After the inversion of the inverter U5, the first input end S of the latch U4 is connected to the high level, so that the output end Q of the latch U4 outputs a low level, the first MOS tube Q1 is turned off, and the on and off of the second MOS tube Q2 depends on the connected discharge drive signal drive, thereby realizing reset after the discharge stops.

[0095] The latch U4 can determine whether to reset the output after the abnormal continuous discharge disappears, combined with the level of the discharge control signal ctrl. That is, the reset operation is performed only when the abnormal continuous discharge disappears and the discharge control signal ctrl is at a low level, thereby ensuring the stability of the discharge interruption.

[0096] like Figure 7 As shown, optionally, the switch control unit further includes an OR gate U6.

[0097] Among them, the first input end of the OR gate U6 is electrically connected to the output end of the delay sub-unit U2 and the input end of the inverter U5 respectively, the second input end of the OR gate U6 is used to access the discharge control signal ctrl, and the output end of the OR gate U6 is electrically connected to the second input end R of the latch U4.

[0098] In the above embodiment, it has been mentioned that the latch U4 can output a low level through the output terminal Q to achieve reset when the first input terminal S is connected to a high level and the second input terminal R is connected to a low level. However, in actual situations, because the discharge control signal ctrl is controlled by the upper controller, when a driving fault occurs in the driver chip U3, the abnormal discharge may continue without disappearing, but the discharge control signal ctrl may be at a low level. This causes the first input terminal S and the second input terminal R of the latch U4 to be connected to a low level at the same time, which will cause the latch U4 to be in an uncontrollable disabled state.

[0099] To address this problem, in this embodiment, an OR gate U6 is additionally provided so that when abnormal continuous discharge does not disappear but the discharge control signal ctrl is at a low level, the first input terminal and the second input terminal of the OR gate U6 are respectively connected to a high level and a low level, and the OR gate U6 outputs a high level. At this time, the first input terminal S of the latch U4 is connected to a low level but the second input terminal R is still connected to a high level, thereby preventing the latch U4 from being in an uncontrollable prohibited state, thereby improving the reliability of the system.

[0100] like Figure 7 and Figure 8 As shown, the specific operations performed by each component in the discharge control circuit are as follows:

[0101] The XOR gate U1 detects the discharge state of the discharge circuit by detecting the target voltage difference of the discharge resistor R5, and the delay subunit U2 performs timing according to the discharge state.

[0102] If the timing exceeds the preset time, the delay subunit U2 outputs a high level, otherwise it outputs a low level.

[0103] If the delay subunit U2 outputs a high level, the inverter U5 switches to a low level, the latch U4 enters a protection state and latches, outputs a high level, and the first MOS tube Q1 is turned on.

[0104] If the delay subunit U2 outputs a low level, the inverter U5 switches to a high level. If the discharge control signal ctrl is a low level, the protection state of the latch U4 is cleared, the output is a low level, and the first MOS transistor Q1 is turned off.

[0105] According to a second aspect of the present application, a discharge system is provided, comprising a discharge circuit and the discharge control circuit in any one of the above embodiments;

[0106] The discharge circuit is connected in parallel with the bus capacitor and is used to discharge the energy on the bus capacitor.

[0107] The discharge system of the embodiment of the present application is provided with a discharge interruption module. The discharge interruption module can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect so that the discharge circuit stops discharging. The interruption control can be performed in time when abnormal continuous discharge occurs, which will not waste energy, reduce the risk of burning the discharge circuit, and avoid serious accidents such as fire.

[0108] According to a third aspect of the present application, a vehicle is provided, comprising the discharge system in any one of the above embodiments.

[0109] The vehicle in the embodiment of the present application is provided with a discharge interruption module, which can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect so that the discharge circuit stops discharging. The discharge interruption module can timely perform interruption control when abnormal continuous discharge occurs, without wasting energy, reducing the risk of burning the discharge circuit, and avoiding serious accidents such as fire.

[0110] According to a fourth aspect of the present application, a discharge control method is provided, which is applied to the discharge control circuit in any of the above embodiments. The discharge control method includes:

[0111] The discharge interruption module detects the discharge state of the discharge circuit and controls the discharge circuit to be disconnected when the discharge state indicates that the discharge circuit is abnormally and continuously discharging, so that the discharge circuit stops discharging.

[0112] In the above specific embodiments of the discharge control circuit, it has been mentioned that the discharge control can be implemented by hardware. In this embodiment, the discharge control can also be implemented by software.

[0113] The discharge control method of the embodiment of the present application is applied to a discharge control circuit provided with a discharge interruption module. The discharge interruption module can detect in real time whether the discharge circuit has abnormal continuous discharge and control the discharge circuit to disconnect so that the discharge circuit stops discharging. The method can timely perform interruption control when abnormal continuous discharge occurs, avoid wasting energy, reduce the risk of burning the discharge circuit, and avoid serious accidents such as fire.

[0114] The vehicle may be a pure fuel vehicle, or a pure electric vehicle, a plug-in hybrid vehicle, an extended-range hybrid vehicle or other new energy vehicle, and this application does not make any specific restrictions on this.

[0115] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0116] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0118] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. In the embodiments of the present application, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant content of other embodiments. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A discharge control circuit, characterized in that: Includes discharge interruption module; The discharge interruption module is used to be electrically connected to the discharge circuit, and is used to detect the discharge state of the discharge circuit, and when the discharge state indicates that the discharge circuit has abnormal continuous discharge, control the discharge circuit to disconnect, so that the discharge circuit stops discharging.

2. The discharge control circuit according to claim 1, characterized in that: The discharge interruption module includes a control switch and a switch control unit; The controlled end of the control switch is electrically connected to the output end of the switch control unit, the first access end of the control switch is used to be electrically connected to the controlled end of the discharge circuit, the second access end of the control switch is used to be grounded or used to be connected to the working voltage, and the input end of the switch control unit is used to be electrically connected to the discharge circuit; The switch control unit is used to detect the discharge state of the discharge circuit and output a target control signal to the control switch when the discharge state indicates that the discharge circuit is abnormally and continuously discharging, so as to control the control switch to be turned on so that the controlled end of the discharge circuit is connected to the discharge drive signal indicating that the discharge circuit is disconnected.

3. The discharge control circuit according to claim 1, characterized in that: The discharge interruption module includes a control switch and a switch control unit; The controlled end of the control switch is electrically connected to the output end of the switch control unit, the first access end and the second access end of the control switch are used to be connected in series in the discharge circuit, and the input end of the switch control unit is used to be electrically connected to the discharge circuit; The switch control unit is used to detect the discharge state of the discharge circuit and output a target control signal to the control switch when the discharge state indicates that the discharge circuit has abnormal and continuous discharge, so as to disconnect the discharge circuit by controlling the control switch to be disconnected.

4. The discharge control circuit according to claim 2 or 3, characterized in that: The first input terminal of the switch control unit is used to be electrically connected to the first detection node in the discharge circuit, and the second input terminal of the switch control unit is used to be electrically connected to the second detection node in the discharge circuit; The switch control unit is configured to detect a target pressure difference between the first detection node and the second detection node, and output the target control signal to the control switch when the target pressure difference indicates that abnormal continuous discharge occurs in the discharge circuit.

5. The discharge control circuit according to claim 4, characterized in that: The first input terminal of the switch control unit is used to be electrically connected to the first end of the bleeder resistor in the bleeder circuit, and the second input terminal of the switch control unit is used to be electrically connected to the second end of the bleeder resistor; The switch control unit is used to detect the resistance voltage difference across the discharge resistor and output the target control signal to the control switch when the resistance voltage difference is greater than a preset voltage difference and lasts longer than a preset time; the target voltage difference includes the resistance voltage difference.

6. The discharge control circuit according to claim 5, characterized in that: The switch control unit includes an XOR gate and a delay subunit; The first input end of the XOR gate is used to be electrically connected to the first end of the bleeder resistor, the second input end of the XOR gate is used to be electrically connected to the second end of the bleeder resistor, the output end of the XOR gate is electrically connected to the input end of the delay subunit, and the output end of the delay subunit is electrically connected to the controlled end of the control switch.

7. The discharge control circuit according to claim 6, characterized in that: The switch control unit further includes a latch and an inverter; The input end of the inverter is electrically connected to the output end of the delay sub-unit, the output end of the inverter is electrically connected to the first input end of the latch, the second input end of the latch is used to receive a discharge control signal, and the output end of the latch is electrically connected to the controlled end of the control switch.

8. The discharge control circuit according to claim 7, characterized in that: The switch control unit further includes an OR gate; The first input end of the OR gate is electrically connected to the output end of the delay sub-unit and the input end of the inverter respectively, the second input end of the OR gate is used to access the discharge control signal, and the output end of the OR gate is electrically connected to the second input end of the latch.

9. The discharge control circuit according to claim 1, characterized in that: The discharge control circuit also includes a discharge drive module; The input end of the discharge driving module is used to receive the discharge control signal; The output end of the discharge driving module is used to be electrically connected to the controlled end of the discharge circuit, and is used to output a discharge driving signal to the discharge circuit according to the input discharge control signal.

10. The discharge control circuit according to claim 9, characterized in that: The discharge control circuit further includes a filtering module; The first end of the filter module is electrically connected to the input end of the discharge driving module, and the second end of the filter module is used for grounding; The filtering module is used to filter the discharge control signal connected to the discharge driving module.

11. The discharge control circuit according to claim 10, characterized in that: The filtering module includes a filtering capacitor and a filtering resistor; The first end of the filter capacitor is electrically connected to the first end of the filter resistor and the input end of the discharge driving module respectively, and the second end of the filter capacitor and the second end of the filter resistor are grounded respectively.

12. A discharge system, characterized in that: comprising a discharge circuit and the discharge control circuit according to any one of claims 1 to 11; The discharge circuit is connected in parallel with the bus capacitor and is used to discharge the energy on the bus capacitor.

13. A vehicle, characterized in that: Includes the relief system of claim 12.

14. A discharge control method, characterized in that: Applied to the discharge control circuit according to any one of claims 1 to 5 or the discharge control circuit according to any one of claims 9 to 11, the discharge control method includes: The discharge interruption module detects a discharge state of the discharge circuit and controls the discharge circuit to be disconnected when the discharge state indicates that the discharge circuit is abnormally and continuously discharging, so that the discharge circuit stops discharging.

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