Shutdown path detection method, circuit and storage medium for DCDC converter

Abstract

The present application belongs to the technical field of new energy vehicles, and specifically relates to a shutdown path detection method, circuit and storage medium for a DCDC converter of a new energy vehicle. A first trigger signal is sent to a common protection unit; a first shutdown signal and a second shutdown signal are used to control a first shutdown path switch unit and a second shutdown path switch unit to perform a shutdown operation respectively; a first actual state signal of the first shutdown path switch unit after performing a shutdown operation and a second actual state signal of the second shutdown path switch unit after performing a shutdown operation are obtained; wherein the first actual state signal is used to indicate whether the first shutdown path switch unit successfully performs a shutdown operation; the second actual state signal is used to indicate whether the second shutdown path switch unit successfully performs a shutdown operation; based on the first actual state signal, it is determined whether there is a shutdown abnormality in the first shutdown path; based on the second actual state signal, it is determined whether there is a shutdown abnormality in the second shutdown path.

Description

Technical Field

[0001] The present application belongs to the technical field of new energy vehicles, and specifically relates to a shutdown path detection method, circuit and storage medium of a DC (Direct Current) DC converter for new energy vehicles. Background Art

[0002] In new energy vehicles, the DCDC converter can achieve bidirectional conversion, that is, on the one hand, it can convert high-voltage DC into low-voltage DC to power low-voltage batteries and loads, and on the other hand, it can convert low-voltage DC into high-voltage DC to power high-voltage batteries.

[0003] The DCDC converter in the related art includes an energy conversion path, which is used to achieve the above-mentioned direct current bidirectional conversion.

[0004] The energy conversion path includes an energy conversion unit, a high-voltage battery and a low-voltage battery. The energy conversion unit includes a first input-output terminal and a second input-output terminal, the first input-output terminal is connected to the high-voltage battery through a first switch unit, and the second input-output terminal is connected to the low-voltage battery and a load through a second switch unit.

[0005] The DCDC converter also includes a shut-down path, which is used to determine whether to shut down the energy conversion path according to the state information of the energy conversion unit. The shut-down path includes a protection unit, a coordination unit, a drive unit, and a switch unit including a first switch unit and a second switch unit.

[0006] The protection unit is used to monitor the state of the energy conversion unit based on the sampling signals obtained from the first input and output terminals and the second input and output terminals. When the energy conversion unit fails, the protection unit controls the closing of the switch units including the first switch unit and the second switch unit through the coordination unit and the drive unit, thereby shutting off the energy transmission path.

[0007] However, when any unit in the shutdown path of the DCDC converter is abnormal, the shutdown process of the energy transmission path may fail. Once the shutdown failure occurs when the energy transmission path needs to be shut down, it will have an adverse effect on the energy conversion path. Summary of the invention

[0008] The present application provides a shutdown path detection method for a DCDC converter, which can solve the problem in the related art that when the energy transmission path needs to be shut down, the shutdown path fails due to failure to detect the presence of a faulty unit in the shutdown path.

[0009] In order to solve the technical problem described in the background technology of the present application, the first aspect of the present application provides a shutdown path detection method of a DCDC converter, wherein the shutdown path detection method of the DCDC converter is executed by a control unit, and comprises the following steps:

[0010] Sending a first trigger signal to the common protection unit;

[0011] The first trigger signal is used to trigger the common protection unit to respond, and send a first shutdown signal to the first shutdown path switch unit through the first shutdown path, and send a second shutdown signal to the second shutdown path switch unit through the second shutdown path; the first shutdown signal and the second shutdown signal are used to control the first shutdown path switch unit and the second shutdown path switch unit to perform shutdown operations respectively;

[0012] Acquire a first actual state signal of the first shut-off path switch unit after performing a shut-off operation, and a second actual state signal of the second shut-off path switch unit after performing a shut-off operation;

[0013] The first actual state signal is used to indicate whether the first shut-off path switch unit successfully performs the shut-off operation; the second actual state signal is used to indicate whether the second shut-off path switch unit successfully performs the shut-off operation;

[0014] Based on the first actual state signal, determining whether there is a shutdown abnormality in the first shutdown path;

[0015] Based on the second actual state signal, it is determined whether there is a shutdown abnormality in the second shutdown path.

[0016] Optionally, after the step of determining whether there is a shutdown abnormality in the first shutdown path and the second shutdown path, the following steps are further performed:

[0017] Sending a second trigger signal to the first dedicated protection unit;

[0018] The second trigger signal is used to trigger the first dedicated protection unit to respond with a first response signal; the state of the first response signal can indicate whether the first dedicated protection unit successfully responds to the second trigger signal;

[0019] Based on the state of the first response signal, determining whether there is an abnormality in the first dedicated protection unit in the first shutdown path;

[0020] Sending a third trigger signal to the second dedicated protection unit;

[0021] The third trigger signal is used to trigger the second dedicated protection unit to respond with a second response signal; the state of the second response signal can indicate whether the second dedicated protection unit successfully responds to the third trigger signal;

[0022] Based on the state of the second response signal, it is determined whether there is an abnormality in the second dedicated protection unit in the second shutdown path.

[0023] Optionally, the step of: judging whether there is an abnormality in the first dedicated protection unit in the first shutdown path based on the state of the first response signal comprises the steps of:

[0024] When the first response signal is in the first state, it is determined that the first dedicated protection unit in the first shutdown path is normal; otherwise, it is determined that the first dedicated protection unit in the first shutdown path is abnormal.

[0025] The step of judging whether the second dedicated protection unit in the second shutdown path is abnormal based on the state of the second response signal comprises the following steps:

[0026] When the second response signal is in the first state, it is determined that the second dedicated protection unit in the second shutdown path is normal; otherwise, it is determined that the second dedicated protection unit in the second shutdown path is abnormal.

[0027] Optionally, the shutdown path detection method of the DCDC converter further includes:

[0028] Based on the result of determining whether the first shut-down path has a shut-down abnormality, counting the number of times the first shut-down path has a shut-down abnormality;

[0029] Based on the result of determining whether the second shut-down path has a shut-down abnormality, counting the number of times the second shut-down path has a shut-down abnormality;

[0030] The number of times the first shutoff path has a shutoff abnormality and the number of times the second shutoff path has a shutoff abnormality are stored.

[0031] Optionally, the first trigger signal can also trigger the common protection unit to respond and generate a third response signal and a fourth response signal;

[0032] The states of the third response signal and the fourth response signal can indicate whether the common protection unit successfully responds to the first trigger signal;

[0033] The shutdown path detection method of the DCDC converter further includes:

[0034] Acquire the third response signal and the fourth response signal sent by the common protection unit;

[0035] Based on the state of the third response signal, it is determined whether the first shutdown path has a shutdown abnormality, and based on the state of the fourth response signal, it is determined whether the second shutdown path has a shutdown abnormality.

[0036] Optionally, when the third response signal is in a state other than the first state, it is determined that a shutdown abnormality exists in the first shutdown path;

[0037] When the fourth response signal is in a state other than the first state, it is determined that a shutdown abnormality exists in the second shutdown path.

[0038] Optionally, the step of: judging whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the steps of:

[0039] When the first actual state signal is in a connected state, determining that a shutdown abnormality exists in the first shutdown path;

[0040] The step of determining whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps:

[0041] When the second actual state signal is in a connected state, it is determined that a shutdown abnormality exists in the second shutdown path.

[0042] Optionally, the step of obtaining a first actual state signal of the first shut-off path switch unit after performing a shut-off operation and a second actual state signal of the second shut-off path switch unit after performing a shut-off operation comprises the following steps:

[0043] Acquire a first buck-end actual state signal of the buck-end switch of the first turn-off path switch unit after the turn-off operation is performed, and a first boost-end actual state signal of the boost-end switch of the first turn-off path switch unit after the turn-off operation is performed;

[0044] A second buck-end actual state signal of the buck-end switch of the second turn-off path switch unit after the turn-off operation is performed, and a second boost-end actual state signal of the boost-end switch of the second turn-off path switch unit after the turn-off operation is performed are obtained.

[0045] Optionally, the step of: judging whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the following steps:

[0046] When the actual state signal of the first step-down terminal is in a connected state, it is determined that there is a shutdown abnormality in the first shutdown path, or,

[0047] When the actual state signal of the first boost terminal is in a connected state, determining that a shutdown abnormality exists in the first shutdown path;

[0048] The step of determining whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps:

[0049] When the actual state signal of the second step-down terminal is in the connected state, it is determined that the second shut-off path has a shut-off abnormality, or,

[0050] When the actual state signal of the second boost terminal is in a connected state, it is determined that a shutdown abnormality exists in the first shutdown path.

[0051] Optionally, the step of obtaining a first buck-end actual state signal of the buck-end switch of the first turn-off path switch unit after performing a turn-off operation, and a first boost-end actual state signal of the boost-end switch of the first turn-off path switch unit after performing a turn-off operation, comprises the following steps:

[0052] Acquire a first voltage difference between a buck-end switch input terminal and an output terminal of the first off-path switch unit, and a second voltage difference between a boost-end switch output terminal and an input terminal of the first off-path switch unit;

[0053] Wherein, the first voltage difference is used as the actual state signal of the first buck terminal; the second voltage difference is used as the actual state signal of the first boost terminal;

[0054] The step of obtaining a second buck-end actual state signal of the buck-end switch of the second turn-off path switch unit after the turn-off operation is performed, and a second boost-end actual state signal of the boost-end switch of the second turn-off path switch unit after the turn-off operation is performed, comprises the following steps:

[0055] Acquire a third voltage difference between the input and output ends of the buck-end switch of the second off-path switch unit, and a fourth voltage difference between the output and input ends of the boost-end switch of the second off-path switch unit;

[0056] The third voltage difference is used as the actual state signal of the second step-down terminal; and the fourth voltage difference is used as the actual state signal of the second step-up terminal.

[0057] Optionally, the step of: judging whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the following steps:

[0058] When the first voltage difference does not reach the first threshold, it is determined that the first shut-off path has a shut-off abnormality, or,

[0059] When the second pressure difference does not reach a second threshold value within a first predetermined time period, it is determined that a shutdown abnormality exists in the first shutdown path;

[0060] The first threshold and the first predetermined time period are preset.

[0061] Optionally, the step of: judging whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps:

[0062] When the third voltage difference does not reach the first threshold, it is determined that the second shut-off path has a shut-off abnormality, or,

[0063] When the fourth pressure difference does not reach the second threshold value within the first predetermined time period, it is determined that the second shut-off path has a shut-off abnormality;

[0064] The first threshold and the first predetermined time period are preset.

[0065] In order to solve the technical problems described in the background technology, the second aspect of the present application provides a shutdown path detection circuit of a DCDC converter, wherein the shutdown path detection circuit of the DCDC converter includes a control unit, and the control unit is used to execute the shutdown path detection method of the DCDC converter described in the first aspect of the present application.

[0066] Optionally, the DCDC converter includes a first energy conversion unit and a second energy conversion unit;

[0067] The shutdown path detection circuit of the DCDC converter further includes: a first shutdown path, a second shutdown path and a common protection unit;

[0068] The first shut-off path includes a first shut-off path switch unit, the first shut-off path switch unit is connected to the output end of the first energy conversion unit, and is used to control the on-off of the output end of the first energy conversion unit;

[0069] The second shut-off path includes a second shut-off path switch unit, the first shut-off path switch unit is connected to the output end of the first energy conversion unit, and is used to control the on-off of the output end of the first energy conversion unit;

[0070] The first shutoff path is communicatively connected with the control unit and the common protection unit, so that signal interaction can be performed between the first shutoff path switch unit, the control unit and the common protection unit;

[0071] The second shutoff path is communicatively connected with the control unit and the common protection unit, so that signal interaction can be performed between the second shutoff path switch unit, the control unit and the common protection unit.

[0072] Optionally, the first energy conversion unit and the second energy conversion unit both include a boost output terminal and a buck output terminal;

[0073] The first energy conversion unit and the second energy conversion unit are capable of converting low-voltage direct current into high-voltage direct current and outputting the high-voltage direct current from their respective boost output terminals;

[0074] The first energy conversion unit and the second energy conversion unit are also capable of converting high voltage direct current into low voltage direct current and outputting the low voltage direct current from their respective step-down output terminals;

[0075] The first off-path switch unit and the second off-path switch unit each include a respective boost-end switch and a buck-end switch;

[0076] The boost end switch of the first shut-off path switch unit is connected to the boost output end of the first energy conversion unit; the buck end switch of the first shut-off path switch unit is connected to the buck output end of the first energy conversion unit;

[0077] The boost end switch of the second shut-off path switch unit is connected to the boost output end of the second energy conversion unit; the buck end switch of the second shut-off path switch unit is connected to the buck output end of the second energy conversion unit.

[0078] Optionally, signal interaction can be performed between the switch unit, the control unit and the common protection unit;

[0079] The second shutoff path further includes a second dedicated protection unit, and signal interaction can be performed among the second dedicated protection unit, the second shutoff path switch unit, the control unit and the common protection unit.

[0080] In order to solve the technical problem described in the background technology, the third aspect of the present application provides a computer-readable storage medium, in which at least one program is stored, and the program is used to implement the shutdown path detection method of the DCDC converter as described in the first aspect of the present application.

[0081] The technical solution of the present application includes at least the following advantages: a control unit first sends a trigger signal to a common protection unit used by the first shutdown path and the second shutdown path, and the common protection unit generates a first shutdown signal in response to the trigger signal and outputs it to the first shutdown path switch unit, generates a second shutdown signal and outputs it to the second shutdown path switch unit, judges whether the first shutdown path switch unit can successfully respond to the first shutdown signal, and judges whether the second shutdown path switch unit can successfully respond to the second shutdown signal to determine whether there is a shutdown abnormality in the corresponding shutdown path, so that when a shutdown abnormality exists in the shutdown path, it can be discovered and handled in time to avoid adverse effects on the energy conversion path of the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0083] Figure 1 A DCDC converter shutdown path detection circuit provided by the present application is shown;

[0084] Figure 2 Shown in Figure 1 Based on this, a timing diagram of a shutdown path detection method of a DCDC converter shown in an embodiment of the present application;

[0085] Figure 3 Shown in Figure 1 Based on another embodiment, a DCDC converter shutdown path detection circuit diagram is shown;

[0086] Figure 4 Shown in Figure 3 Based on the structure shown, a schematic diagram of a shutdown path detection circuit of a DCDC converter provided in other embodiments of the present application;

[0087] Figure 5 Another embodiment of the present application provides a method for detecting Figure 4 The timing diagram of the shutdown path detection method of the DCDC converter of the circuit shown. DETAILED DESCRIPTION

[0088] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0089] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0090] In the description of this application, it should 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0091] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0092] Figure 1 The present application provides a DCDC converter shutdown path detection circuit, wherein the DCDC converter 100 includes a first energy conversion unit 101 and a second energy conversion unit 102. Figure 1 It can be seen from FIG. 1 that the DCDC converter shutdown path detection circuit includes: a first shutdown path 210 , a second shutdown path 220 , a control unit 130 and a common protection unit 140 .

[0093] The first shutoff path 210 includes a first shutoff path switch unit 110 . The first shutoff path switch unit 110 is connected to the output end of the first energy conversion unit 101 and is used to control the on / off of the output end of the first energy conversion unit 101 .

[0094] The second shutoff path 220 includes a second shutoff path switch unit 120 . The first shutoff path switch unit 120 is connected to the output end of the second energy conversion unit 102 and is used to control the on and off of the output end of the second energy conversion unit 102 .

[0095] The first shutdown path 210 is communicatively connected with the control unit 130 and the common protection unit 140, so that signal interaction can be performed between the first shutdown path switch unit 110, the control unit 130 and the common protection unit 140. The first shutdown path 210 controls the on-off of the output end of the first energy conversion unit 101 by turning on and off the first shutdown path switch unit 110.

[0096] The second shutoff path 220 is communicatively connected with the control unit 130 and the common protection unit 140, so that signal interaction can be performed between the second shutoff path switch unit 120, the control unit 130 and the common protection unit 140, and the second shutoff path 220 controls the on-off of the output end of the second energy conversion unit 102 by turning on and off the second shutoff path switch unit 120.

[0097] When the output end of the first energy conversion unit 101 or the second energy conversion unit 102 is connected to a battery, it is used to supply power to the battery.

[0098] Figure 2 Shown in Figure 1 Based on this, a timing diagram of a shutdown path detection method of a DCDC converter shown in an embodiment of the present application is shown in FIG. Figure 2 It can be seen that the shutdown path detection method of the DCDC converter includes the following steps S21 to S24 performed in sequence:

[0099] Step S21: the control unit 130 sends a first trigger signal to the common protection unit 140;

[0100] The first trigger signal is used to trigger the common protection unit 140 to respond, and send a first shutdown signal to the first shutdown path switch unit 110 through the first shutdown path 210, and send a second shutdown signal to the second shutdown path switch unit 120 through the second shutdown path 220; the first shutdown signal and the second shutdown signal are respectively used to control the first shutdown path switch unit 110 and the second shutdown path switch unit 120 to perform shutdown operations.

[0101] Step S22: the control unit 130 acquires a first actual state signal of the first turn-off path switch unit 110 after performing a turn-off operation, and a second actual state signal of the second turn-off path switch unit 120 after performing a turn-off operation.

[0102] The first actual state signal is used to indicate the actual on-off state of the first turn-off path switch unit 110 , that is, the first actual state signal can indicate whether the first turn-off path switch unit 110 successfully performs the turn-off operation.

[0103] If the first shut-off path switch unit 110 is normal, after the first shut-off path switch unit 110 receives the first shut-off signal, the first shut-off path switch unit 110 can successfully perform a shut-off operation, so that the first actual state signal of the first shut-off path switch unit 110 is in an off state.

[0104] If the first shutoff path switch unit 110 is abnormal, after the first shutoff path switch unit 110 receives the first shutoff signal, the first shutoff path switch unit 110 fails to perform a shutoff operation, so that the first actual state signal of the first shutoff path switch unit 110 is in a connected state.

[0105] The second actual state signal is used to indicate the actual on-off state of the second turn-off path switch unit 120 , that is, the second actual state signal can indicate whether the second turn-off path switch unit 120 successfully performs the turn-off operation.

[0106] Similar to the first shut-off path switch unit 110, if the second shut-off path switch unit 120 is normal, after the second shut-off path switch unit 120 receives the second shut-off signal, the second shut-off path switch unit 120 can successfully perform the shut-off operation, so that the second actual state signal of the second shut-off path switch unit 120 is in the disconnected state.

[0107] If the second shutoff path switch unit 120 is abnormal, after the second shutoff path switch unit 120 receives the second shutoff signal, the second shutoff path switch unit 120 fails to perform a shutoff operation, so that the second actual state signal of the second shutoff path switch unit 120 is in a connected state.

[0108] Step S23: the control unit 130 determines whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal.

[0109] When the first actual state signal is in a connected state, it is determined that a shutdown abnormality exists in the first shutdown path.

[0110] When the first actual state signal is in a connected state, it indicates that the first shutoff path switch unit 110 fails to successfully respond to the first shutoff signal, so that the first shutoff path switch unit 110 is abnormal, that is, the first shutoff path is shutoff abnormal.

[0111] Step S24: the control unit 130 determines whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal.

[0112] When the second actual state signal is in a connected state, it is determined that a shutdown abnormality exists in the second shutdown path.

[0113] When the second actual state signal is in a connected state, it indicates that the second shutoff path switch unit 120 fails to successfully respond to the second shutoff signal, so that the second shutoff path switch unit 120 is abnormal, that is, the second shutoff path has a shutoff abnormality.

[0114] In this embodiment, the control unit first sends a trigger signal to the common protection unit used by the first shutdown path and the second shutdown path. The common protection unit generates a first shutdown signal in response to the trigger signal and outputs it to the first shutdown path switch unit, generates a second shutdown signal and outputs it to the second shutdown path switch unit, judges whether the first shutdown path switch unit can successfully respond to the first shutdown signal, and judges whether the second shutdown path switch unit can successfully respond to the second shutdown signal to determine whether there is a shutdown abnormality in the corresponding shutdown path, so that when a shutdown abnormality exists in the shutdown path, it can be discovered and handled in time to avoid adverse effects on the energy conversion path of the related technology.

[0115] Figure 3 Shown in Figure 1 A DCDC converter shutdown path detection circuit diagram is shown based on another embodiment.

[0116] In this embodiment, the first energy conversion unit 101 and the second energy conversion unit 102 both include a boost output terminal 310 and a buck output terminal 320. The first energy conversion unit 101 and the second energy conversion unit 102 can convert low-voltage direct current into high-voltage direct current and output it to the high-voltage battery from the boost output terminal 310. The first energy conversion unit 101 and the second energy conversion unit 102 can also convert high-voltage direct current into low-voltage direct current and output it to the low-voltage battery from the buck output terminal 320.

[0117] The first turn-off path switch unit 110 and the second turn-off path switch unit 120 each include a boost-end switch and a buck-end switch.

[0118] The boost end switch 111 of the first off-path switch unit is connected to the boost output end 310 of the first energy conversion unit 101 ; the buck end switch 112 of the first off-path switch unit is connected to the buck output end 320 of the first energy conversion unit 101 .

[0119] The boost end switch 121 of the second off path switch unit is connected to the boost output end 310 of the second energy conversion unit 102 ; the buck end switch 122 of the second off path switch unit is connected to the buck output end 320 of the second energy conversion unit 102 .

[0120] based on Figure 3 The circuit shown, Figure 2 The step S22 shown in FIG. 1 : the control unit 130 acquires the first actual state signal of the first shut-off path switch unit 110 after performing the shut-off operation, and the second actual state signal of the second shut-off path switch unit 120 after performing the shut-off operation, which may include the following steps S221 to S222 performed in sequence:

[0121] Step S221: the control unit 130 obtains the first buck-end actual state signal of the buck-end switch 112 of the first turn-off path switch unit after performing the turn-off operation, and the first boost-end actual state signal of the boost-end switch 111 of the first turn-off path switch unit after performing the turn-off operation.

[0122] The first buck-end actual state signal is used to indicate the actual on-off state of the buck-end switch 112 of the first shut-off path switch unit, that is, the first buck-end actual state signal can indicate whether the buck-end switch 112 of the first shut-off path switch unit successfully performs the shut-off operation.

[0123] The first boost end actual state signal is used to indicate the actual on-off state of the boost end 112 switch of the first shut-off path switch unit, that is, the first boost end actual state signal can indicate whether the boost end 112 switch of the first shut-off path switch unit successfully performs the shut-off operation.

[0124] If the first turn-off path switch unit 110 is normal, after the first turn-off path switch unit 110 receives the first turn-off signal, the first turn-off path switch unit 110, its buck-end switch 112 and boost-end switch 111, each successfully perform a turn-off operation, so that the actual state signals of the buck-end switch 112 and the boost-end switch 111 are both in the disconnected state.

[0125] If the first shutdown path switch unit 110 is abnormal, after the first shutdown path switch unit 110 receives the first shutdown signal, the buck-end switch 112 or the boost-end switch 111 of the first shutdown path switch unit does not successfully perform the shutdown operation, so that the actual state signal of the buck-end switch 112 or the boost-end switch 111 of the first shutdown path switch unit is a connected state.

[0126] Exemplarily, the above step S221 may include the following steps S2211:

[0127] Step S2211: obtaining a first voltage difference between the input and output ends of the buck-end switch 112 of the first off-path switch unit and a second voltage difference between the output and input ends of the boost-end switch 111 of the first off-path switch unit.

[0128] The first voltage difference is used as the actual state signal of the first step-down terminal; and the second voltage difference is used as the actual state signal of the first step-up terminal.

[0129] Continue to refer to Figure 3The first voltage difference is equal to V3a minus V4a, where V3a represents the voltage value of the input terminal of the buck-end switch 112 of the first off-path switch unit, and V4a represents the voltage value of the output terminal of the buck-end switch 112 of the first off-path switch unit.

[0130] The second voltage difference is equal to V1 minus V2a, where V1 represents the voltage value of the output terminal of the boost end switch 111 of the first off path switch unit, and V2a represents the voltage value of the input terminal of the boost end switch 111 of the first off path switch unit.

[0131] Step S222: the control unit 130 obtains the second buck-end actual state signal of the buck-end switch 122 of the second shut-down path switch unit after performing the shut-down operation, and the second boost-end actual state signal of the boost-end switch 111 of the second shut-down path switch unit after performing the shut-down operation.

[0132] The buck-end switch 122 and the boost-end switch 111 of the second off-path switch unit have the same working principle as that of the first off-path switch unit 110 in step S221 , and are not described in detail herein.

[0133] The above step S222 may include the following steps S2221:

[0134] Step S2221: obtaining a third voltage difference between the input and output ends of the buck-end switch 122 of the second off-path switch unit and a fourth voltage difference between the output and input ends of the boost-end switch 121 of the second off-path switch unit.

[0135] The third voltage difference is used as the actual state signal of the second step-down terminal; and the fourth voltage difference is used as the actual state signal of the second step-up terminal.

[0136] Continue to refer to Figure 3 The third voltage difference is equal to V3b minus V4b, where V3b represents the voltage value of the input end of the buck end switch 122 of the second off path switch unit, and V4b represents the voltage value of the output end of the buck end switch 122 of the second off path switch unit.

[0137] The fourth voltage difference is equal to V1 minus V2b, where V1 also represents the voltage value of the output end of the boost end switch 121 of the second off path switch unit, and V2b represents the voltage value of the input end of the boost end switch 121 of the second off path switch unit.

[0138] based on Figure 3 The circuit shown, Figure 2 Step S23 shown in FIG. 2 : based on the first actual state signal, determining whether there is a shutdown abnormality in the first shutdown path includes the following steps:

[0139] Step S231: when the actual state signal of the first step-down terminal is in the connected state, determining that a shutdown abnormality exists in the first shutdown path; or when the actual state signal of the first step-up terminal is in the connected state, determining that a shutdown abnormality exists in the first shutdown path.

[0140] It can be understood that when the buck-end switch 112 of the first shut-off path switch unit 110 is in a connected state, it means that the buck-end switch 112 of the first shut-off path switch unit has not been successfully shut down; thus, there is a shut-off abnormality in the first shut-off path. When the boost-end switch 111 of the first shut-off path switch unit 110 is in a connected state, it means that the boost-end switch 111 of the first shut-off path switch unit has not been successfully shut down; thus, there is a shut-off abnormality in the first shut-off path.

[0141] Exemplarily, when the first voltage difference is used as the actual state signal of the first buck terminal, and the second voltage difference is used as the actual state signal of the first boost terminal, the above step S231 may include the following steps:

[0142] Step S2311: When the first voltage difference does not reach the first threshold, it is determined that there is a shutdown abnormality in the first shutdown path, or, when the second voltage difference does not reach the second threshold within a first predetermined time period, it is determined that there is a shutdown abnormality in the first shutdown path; wherein the first threshold and the first predetermined time period are pre-set.

[0143] Continue to refer to Figure 3 , when the first voltage difference of V3a minus V4a does not reach the first threshold, it is determined that the step-down end switch 112 of the first shut-off path switch unit fails to shut down, that is, it is determined that the first shut-off path has a shut-off abnormality. Alternatively, within a first predetermined time period, the second voltage difference of V1 minus V2a never reaches the second threshold, it is determined that the step-up end switch 111 of the first shut-off path switch unit fails to shut down, that is, it can also be determined that the first shut-off path has a shut-off abnormality.

[0144] Optionally, there may be a plurality of buck-end switches 112 of the first turn-off path switch unit, and the buck-end switches 112 of the plurality of first turn-off path switch units are connected in series at the output end of the first energy conversion unit 101 .

[0145] based on Figure 3 The circuit shown, Figure 2 The step S24 shown in : based on the second actual state signal, judging whether there is a shutdown abnormality in the second shutdown path includes the following steps:

[0146] Step S241: when the actual state signal of the second step-down terminal is in the connected state, determining that the second shutdown path has a shutdown abnormality, or when the actual state signal of the second step-up terminal is in the connected state, determining that the first shutdown path has a shutdown abnormality.

[0147] It can be understood that when the buck-end switch 122 of the second shut-off path switch unit 120 is in a connected state, it means that the buck-end switch 122 of the second shut-off path switch unit has not been successfully shut down; thus, there is a shut-off abnormality in the second shut-off path. When the boost-end switch 131 of the second shut-off path switch unit 120 is in a connected state, it means that the boost-end switch 121 of the second shut-off path switch unit has not been successfully shut down; thus, there is a shut-off abnormality in the second shut-off path.

[0148] Exemplarily, the third voltage difference is used as the actual state signal of the second buck terminal; the fourth voltage difference is used as the actual state signal of the second boost terminal, and the above step S24 may include the following steps:

[0149] Step S2411: When the third voltage difference does not reach the first threshold, it is determined that the second shutdown path has a shutdown abnormality, or, when the fourth voltage difference does not reach the second threshold within a first predetermined time period, it is determined that the second shutdown path has a shutdown abnormality; wherein the first threshold and the first predetermined time period are pre-set.

[0150] Continue to refer to Figure 3 , when the third voltage difference of V3b minus V4b does not reach the first threshold, it is determined that the step-down end switch 122 of the second shut-off path switch unit fails to shut down, that is, it is determined that the second shut-off path has a shut-off abnormality. Alternatively, within the first predetermined time period, the third voltage difference of V1 minus V2b never reaches the second threshold, it is determined that the step-up end switch 121 of the second shut-off path switch unit fails to shut down, that is, it can also be determined that the second shut-off path has a shut-off abnormality.

[0151] Figure 4 Shown in Figure 3 Based on the structure shown, other embodiments of the present application provide schematic diagrams of a shutdown path detection circuit for a DCDC converter.

[0152] from Figure 4 It can be seen that the first shutoff path further includes a first dedicated protection unit 150 , and signal interaction can be performed between the first dedicated protection unit 150 , the first shutoff path switch unit 110 , the control unit 130 and the common protection unit 140 .

[0153] The second shutoff path further includes a second dedicated protection unit 160 , and signal interaction can be performed among the second dedicated protection unit 160 , the second shutoff path switch unit 120 , the control unit 130 and the common protection unit 140 .

[0154] Figure 5 Another embodiment of the present application provides a method for detecting Figure 4 The shutdown path detection method timing diagram of the DCDC converter of the circuit shown in FIG. Figure 5 It can be seen from the figure that in this embodiment Figure 2 Based on the embodiment shown, the following steps S25 to S28 are also included after step S24 is completed:

[0155] Step S25: Send a second trigger signal to the first dedicated protection unit, wherein the second trigger signal is used to trigger the first dedicated protection unit to respond to the first response signal; the state of the first response signal can also indicate whether the first dedicated protection unit successfully responds to the second trigger signal.

[0156] Step S26: Based on the state of the first response signal, determine whether there is an abnormality in the first dedicated protection unit in the first shutdown path.

[0157] When the first response signal is in the first state, it is determined that the first dedicated protection unit in the first shutdown path is normal; otherwise, it is determined that the first dedicated protection unit in the first shutdown path is abnormal.

[0158] It needs to be explained that when the first response signal issued by the first dedicated protection unit is in the first state, it is determined that the first dedicated protection unit successfully responds to the second trigger signal; otherwise, it is determined that the first dedicated protection unit has not successfully responded to the second trigger signal, that is, the first dedicated protection unit is abnormal.

[0159] Step S27: Send a third trigger signal to the second dedicated protection unit, wherein the third trigger signal is used to trigger the second dedicated protection unit to respond to the second response signal; the status of the second response signal can also indicate whether the second dedicated protection unit successfully responds to the third trigger signal.

[0160] Step S28: Based on the state of the second response signal, determine whether there is an abnormality in the second dedicated protection unit in the second shutdown path.

[0161] When the second response signal is in the first state, it is determined that the second dedicated protection unit in the second shutdown path is normal; otherwise, it is determined that the second dedicated protection unit in the second shutdown path is abnormal.

[0162] It needs to be explained that when the second response signal issued by the second dedicated protection unit is in the first state, it is determined that the second dedicated protection unit successfully responds to the third trigger signal; otherwise, it is determined that the second dedicated protection unit has not successfully responded to the third trigger signal, that is, the second dedicated protection unit is abnormal.

[0163] for Figure 2 or Figure 5 In any of the figures, the first trigger signal shown therein can also trigger the common protection unit to respond and generate a third response signal and a fourth response signal, and the state of the third response signal and the state of the fourth response signal can indicate whether the common protection unit successfully responds to the first trigger signal.

[0164] When the third response signal and the fourth response signal sent by the common protection unit are both in the first state, it is determined that the common protection unit successfully responds to the first trigger signal; otherwise, it is determined that the common protection unit does not successfully respond to the first trigger signal, that is, the common protection unit is abnormal.

[0165] thereby Figure 2 or Figure 5 The shutdown path detection method of the DCDC converter shown further includes the following steps:

[0166] S51: The control unit obtains the third response signal and the fourth response signal sent by the common protection unit.

[0167] S52: Based on the state of the third response signal, determine whether there is a shutdown abnormality in the first shutdown path; based on the state of the fourth response signal, determine whether there is a shutdown abnormality in the second shutdown path.

[0168] When the third response signal is in a state other than the first state, it is determined that a shutdown abnormality exists in the first shutdown path.

[0169] When the fourth response signal is in a state other than the first state, it is determined that a shutdown abnormality exists in the second shutdown path.

[0170] It can be understood that when the third response signal is in a state other than the first state, it indicates that the shared protection unit fails to successfully respond to the first trigger signal sent by the control unit. When the fourth response signal is in a state other than the first state, it indicates that the shared protection unit fails to normally respond to the first trigger signal sent by the control unit.

[0171] for Figures 1 to 5 In any of the figures, after the step of determining whether there is a shutdown abnormality in the first shutdown path and the second shutdown path, the control unit further performs the following steps:

[0172] Based on the result of determining whether the first shut-down path has a shut-down abnormality, counting the number of times the first shut-down path has a shut-down abnormality;

[0173] Based on the result of determining whether the second shut-down path has a shut-down abnormality, counting the number of times the second shut-down path has a shut-down abnormality;

[0174] The number of times the first shutoff path has a shutoff abnormality and the number of times the second shutoff path has a shutoff abnormality are stored.

[0175] The number of shutdown anomalies in the first shutdown path is used to provide a basis for control judgment on whether to enable the first energy conversion unit to work during the subsequent execution of the DCDC converter. When the number of shutdown anomalies in the first shutdown path reaches a predetermined threshold, the first energy conversion unit is not allowed to work during the subsequent execution of the DCDC converter.

[0176] The number of shutdown anomalies in the second shutdown path is used to provide a basis for control judgment on whether to enable the second energy conversion unit to operate during the subsequent execution of the DCDC converter. When the number of shutdown anomalies in the second shutdown path reaches a predetermined threshold, the second energy conversion unit is not allowed to operate during the subsequent execution of the DCDC converter.

[0177] The present application also provides a computer-readable storage medium, wherein at least one program is stored in the computer-readable storage medium, and the program is used to implement Figure 2 or Figure 5 The shutdown path detection method of the DCDC converter is shown.

[0178] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.

Claims

1. A shutdown path detection method for a DCDC converter, characterized in that: The shutdown path detection method of the DCDC converter is executed by a control unit, and comprises the following steps: Sending a first trigger signal to the common protection unit; The first trigger signal is used to trigger the common protection unit to respond, and send a first shutdown signal to the first shutdown path switch unit through the first shutdown path, and send a second shutdown signal to the second shutdown path switch unit through the second shutdown path; the first shutdown signal and the second shutdown signal are used to control the first shutdown path switch unit and the second shutdown path switch unit to perform shutdown operations respectively; Acquire a first actual state signal of the first shut-off path switch unit after performing a shut-off operation, and a second actual state signal of the second shut-off path switch unit after performing a shut-off operation; The first actual state signal is used to indicate whether the first shut-off path switch unit successfully performs the shut-off operation; the second actual state signal is used to indicate whether the second shut-off path switch unit successfully performs the shut-off operation; Based on the first actual state signal, determining whether there is a shutdown abnormality in the first shutdown path; Based on the second actual state signal, it is determined whether there is a shutdown abnormality in the second shutdown path.

2. The shutdown path detection method of the DCDC converter according to claim 1, characterized in that: After the step of determining whether there is a shutdown abnormality in the first shutdown path and the second shutdown path, the following steps are further performed: Sending a second trigger signal to the first dedicated protection unit; The second trigger signal is used to trigger the first dedicated protection unit to respond with a first response signal; the state of the first response signal can indicate whether the first dedicated protection unit successfully responds to the second trigger signal; Based on the state of the first response signal, determining whether there is an abnormality in the first dedicated protection unit in the first shutdown path; Sending a third trigger signal to the second dedicated protection unit; The third trigger signal is used to trigger the second dedicated protection unit to respond with a second response signal; the state of the second response signal can indicate whether the second dedicated protection unit successfully responds to the third trigger signal; Based on the state of the second response signal, it is determined whether there is an abnormality in the second dedicated protection unit in the second shutdown path.

3. The shutdown path detection method of the DCDC converter according to claim 2, characterized in that: The step of determining whether there is an abnormality in the first dedicated protection unit in the first shutdown path based on the state of the first response signal comprises the following steps: When the first response signal is in the first state, it is determined that the first dedicated protection unit in the first shutdown path is normal; otherwise, it is determined that the first dedicated protection unit in the first shutdown path is abnormal; The step of judging whether the second dedicated protection unit in the second shutdown path is abnormal based on the state of the second response signal comprises the following steps: When the second response signal is in the first state, it is determined that the second dedicated protection unit in the second shutdown path is normal; otherwise, it is determined that the second dedicated protection unit in the second shutdown path is abnormal.

4. The shutdown path detection method of the DCDC converter according to claim 1, characterized in that: The shutdown path detection method of the DCDC converter further includes: Based on the result of determining whether the first shut-down path has a shut-down abnormality, counting the number of times the first shut-down path has a shut-down abnormality; Based on the result of determining whether the second shut-down path has a shut-down abnormality, counting the number of times the second shut-down path has a shut-down abnormality; The number of times the first shutoff path has a shutoff abnormality and the number of times the second shutoff path has a shutoff abnormality are stored.

5. The shutdown path detection method of the DCDC converter according to claim 1, characterized in that: The first trigger signal can also trigger the common protection unit to respond and generate a third response signal and a fourth response signal; The states of the third response signal and the fourth response signal can indicate whether the common protection unit successfully responds to the first trigger signal; The shutdown path detection method of the DCDC converter further includes: Acquire the third response signal and the fourth response signal sent by the common protection unit; Based on the state of the third response signal, it is determined whether the first shutdown path has a shutdown abnormality, and based on the state of the fourth response signal, it is determined whether the second shutdown path has a shutdown abnormality.

6. The shutdown path detection method of the DCDC converter according to claim 5, characterized in that: When the third response signal is in a state other than the first state, determining that a shutdown abnormality exists in the first shutdown path; When the fourth response signal is in a state other than the first state, it is determined that a shutdown abnormality exists in the second shutdown path.

7. The shutdown path detection method of the DCDC converter according to claim 1, characterized in that: The step of determining whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the following steps: When the first actual state signal is in a connected state, determining that a shutdown abnormality exists in the first shutdown path; The step of determining whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps: When the second actual state signal is in a connected state, it is determined that a shutdown abnormality exists in the second shutdown path.

8. The shutdown path detection method of the DCDC converter according to claim 1, characterized in that: The step of obtaining a first actual state signal of the first shut-off path switch unit after performing a shut-off operation and a second actual state signal of the second shut-off path switch unit after performing a shut-off operation comprises the following steps: Acquire a first buck-end actual state signal of the buck-end switch of the first turn-off path switch unit after the turn-off operation is performed, and a first boost-end actual state signal of the boost-end switch of the first turn-off path switch unit after the turn-off operation is performed; A second buck-end actual state signal of the buck-end switch of the second turn-off path switch unit after the turn-off operation is performed, and a second boost-end actual state signal of the boost-end switch of the second turn-off path switch unit after the turn-off operation is performed are obtained.

9. The shutdown path detection method of the DCDC converter according to claim 8, characterized in that: The step of determining whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the following steps: When the actual state signal of the first step-down terminal is in a connected state, it is determined that there is a shutdown abnormality in the first shutdown path, or, When the actual state signal of the first boost terminal is in a connected state, determining that a shutdown abnormality exists in the first shutdown path; The step of determining whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps: When the actual state signal of the second step-down terminal is in the connected state, it is determined that the second shut-off path has a shut-off abnormality, or, When the actual state signal of the second boost terminal is in a connected state, it is determined that a shutdown abnormality exists in the first shutdown path.

10. The shutdown path detection method of the DCDC converter according to claim 8, characterized in that: The step of obtaining a first buck-end actual state signal of the buck-end switch of the first turn-off path switch unit after performing a turn-off operation, and a first boost-end actual state signal of the boost-end switch of the first turn-off path switch unit after performing a turn-off operation, comprises the following steps: Acquire a first voltage difference between a buck-end switch input terminal and an output terminal of the first off-path switch unit, and a second voltage difference between a boost-end switch output terminal and an input terminal of the first off-path switch unit; Wherein, the first voltage difference is used as the actual state signal of the first buck terminal; the second voltage difference is used as the actual state signal of the first boost terminal; The step of obtaining a second buck-end actual state signal of the buck-end switch of the second turn-off path switch unit after the turn-off operation is performed, and a second boost-end actual state signal of the boost-end switch of the second turn-off path switch unit after the turn-off operation is performed, comprises the following steps: Acquire a third voltage difference between the input and output ends of the buck-end switch of the second off-path switch unit, and a fourth voltage difference between the output and input ends of the boost-end switch of the second off-path switch unit; The third voltage difference is used as the actual state signal of the second step-down terminal; and the fourth voltage difference is used as the actual state signal of the second step-up terminal.

11. The shutdown path detection method of the DCDC converter according to claim 10, characterized in that: The step of determining whether there is a shutdown abnormality in the first shutdown path based on the first actual state signal comprises the following steps: When the first voltage difference does not reach the first threshold, it is determined that the first shut-off path has a shut-off abnormality, or, When the second voltage difference does not reach a second threshold value within a first predetermined time period, it is determined that a shutdown abnormality exists in the first shutdown path; The first threshold and the first predetermined time period are preset.

12. The shutdown path detection method of the DCDC converter according to claim 10, characterized in that: The step of determining whether there is a shutdown abnormality in the second shutdown path based on the second actual state signal comprises the following steps: When the third voltage difference does not reach the first threshold, it is determined that the second shut-off path has a shut-off abnormality, or, When the fourth voltage difference does not reach the second threshold value within the first predetermined time period, it is determined that the second shut-off path has a shut-off abnormality; The first threshold and the first predetermined time period are preset.

13. A shutdown path detection circuit of a DCDC converter, characterized in that: The shutdown path detection circuit of the DCDC converter comprises a control unit, wherein the control unit is configured to execute the shutdown path detection method of the DCDC converter according to any one of claims 1 to 12.

14. The shutdown path detection circuit of the DCDC converter according to claim 13, characterized in that: The DCDC converter includes a first energy conversion unit and a second energy conversion unit; The shutdown path detection circuit of the DCDC converter further includes: a first shutdown path, a second shutdown path and a common protection unit; The first shut-off path includes a first shut-off path switch unit, the first shut-off path switch unit is connected to the output end of the first energy conversion unit, and is used to control the on-off of the output end of the first energy conversion unit; The second shut-off path includes a second shut-off path switch unit, the first shut-off path switch unit is connected to the output end of the second energy conversion unit, and is used to control the on-off of the output end of the second energy conversion unit; The first shutoff path is communicatively connected with the control unit and the common protection unit, so that signal interaction can be performed between the first shutoff path switch unit, the control unit and the common protection unit; The second shutoff path is communicatively connected with the control unit and the common protection unit, so that signal interaction can be performed between the second shutoff path switch unit, the control unit and the common protection unit.

15. The shutdown path detection circuit of the DCDC converter according to claim 14, characterized in that: The first energy conversion unit and the second energy conversion unit both include a boost output terminal and a buck output terminal; The first energy conversion unit and the second energy conversion unit are capable of converting low-voltage direct current into high-voltage direct current and outputting the high-voltage direct current from their respective boost output terminals; The first energy conversion unit and the second energy conversion unit are also capable of converting high voltage direct current into low voltage direct current and outputting the low voltage direct current from their respective step-down output terminals; The first off-path switch unit and the second off-path switch unit each include a respective boost-end switch and a buck-end switch; The boost end switch of the first shut-off path switch unit is connected to the boost output end of the first energy conversion unit; the buck end switch of the first shut-off path switch unit is connected to the buck output end of the first energy conversion unit; The boost end switch of the second shut-off path switch unit is connected to the boost output end of the second energy conversion unit; the buck end switch of the second shut-off path switch unit is connected to the buck output end of the second energy conversion unit.

16. The shutdown path detection circuit of the DCDC converter according to claim 14, characterized in that: The first shutoff path further includes a first dedicated protection unit, and the first dedicated protection unit, the first shutoff path switch unit, the control unit and the common protection unit can perform signal interaction; The second shutoff path further includes a second dedicated protection unit, and signal interaction can be performed among the second dedicated protection unit, the second shutoff path switch unit, the control unit and the common protection unit.

17. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program, and the program is used to implement the shutdown path detection method of the DCDC converter according to any one of claims 1 to 12.

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