Bidirectional DC / DC converter overload processing method, device, storage medium and terminal

Abstract

The present invention provides an overload processing method for a bidirectional DC / DC converter, the method comprising: detecting the DC current corresponding to the power battery side or the inverter side of the bidirectional DC / DC converter at a preset time interval; obtaining the current level matched by the DC current; and performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level. The present invention maximizes the voltage management of the DC side of the inverter, solves the problem that the bidirectional DC / DC converter is prone to failure or even damage, protects the components in the bidirectional DC / DC converter, and solves the problem that the driving process is highly likely to fail and the bidirectional DC / DC converter is prone to failure or even damage when using a bidirectional DC / DC converter in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of information technology, and in particular to an overload processing method, device, storage medium and terminal for a bidirectional DC / DC converter. Background Art

[0002] In existing electric drive systems of new energy vehicles, the power battery is either directly connected to the inverter or connected to the inverter through a first-level bidirectional DC / DC converter.

[0003] Among them, the method of directly connecting the power battery to the inverter cannot achieve level conversion between DC high and low voltages. As the power of the power battery decreases, the battery voltage will also decrease, limiting the maximum driving capacity of the entire vehicle.

[0004] The power battery is connected to the inverter through a bidirectional DC / DC converter, which can manage the terminal voltage on the DC side of the inverter in real time, and the maximum driving capacity will not be limited due to insufficient voltage level of the power battery. However, the bidirectional DC / DC converter will increase the possibility of failure in the driving process. If the bidirectional DC / DC converter fails, the electric drive system will directly exit the voltage management on the DC side of the inverter, so that the power obtained by the electric drive system from the power battery is limited; if the driving power exceeds the overload capacity of the bidirectional DC / DC converter, the electric drive system will also turn off the fully controlled switching device. Once high power feedback occurs, it is easy for the bidirectional DC / DC converter to fail or even be damaged due to excessive voltage. Summary of the invention

[0005] The present invention provides a method, device, storage medium and terminal for overload processing of a bidirectional DC / DC converter, so as to solve the problems in the prior art that when a bidirectional DC / DC converter is used, the possibility of failure of the driving process is high and the bidirectional DC / DC converter is prone to failure or even damage.

[0006] A method for handling overload of a bidirectional DC / DC converter, comprising:

[0007] Detecting a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval;

[0008] Obtaining a current level matched by the direct current;

[0009] The bidirectional DC / DC converter is overloaded according to the overload processing method corresponding to the current level.

[0010] Optionally, when the current level is a first current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0011] When the DC current matches the first current level, the first timer and the second timer are reset to zero respectively;

[0012] Canceling the current limiting threshold of the bidirectional DC / DC converter;

[0013] Control the third timer and the fourth timer to start timing respectively;

[0014] When the third timer reaches a third time upper limit and the fourth timer reaches a fourth time upper limit, the fully controlled switching device in the bidirectional DC / DC converter is controlled in a preset manner.

[0015] Optionally, when the current level is the second current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0016] When the DC current matches the second current level, controlling the first timer to start timing;

[0017] Determine whether the first timer reaches a first time limit;

[0018] If so, setting a current limiting threshold of the bidirectional DC / DC converter;

[0019] Detect the DC current after the current limit threshold is set;

[0020] When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter;

[0021] Controlling the second timer to start timing;

[0022] When the second timer reaches the second time upper limit, the pressure limiting state is exited.

[0023] Optionally, when the current level is a third current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0024] When the direct current matches the third current level, setting a current limiting threshold of the bidirectional DC / DC converter;

[0025] Detect the DC current after the current limit threshold is set;

[0026] When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter;

[0027] Controlling the second timer to start timing;

[0028] When the second timer reaches the second time upper limit, the pressure limiting state is exited.

[0029] Optionally, when the current level is a fourth current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0030] When the DC current matches the fourth current level, clearing the third timer;

[0031] The fully controlled switch device located in the upper bridge arm of the bidirectional DC / DC converter is started, and the fully controlled switch device located in the lower bridge arm is turned off.

[0032] Optionally, when the current level is the fifth current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0033] When the DC current matches the fifth current level, clearing the fourth timer;

[0034] All fully controlled switching devices in the bidirectional DC / DC converter are turned off.

[0035] Optionally, the bidirectional DC / DC converter includes at least one phase bridge arm.

[0036] An overload processing device for a bidirectional DC / DC converter, comprising:

[0037] A detection module, used to detect a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval;

[0038] An acquisition module, used for acquiring a current level matched by the DC current;

[0039] A processing module is used to perform overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level.

[0040] A terminal comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned overload processing method for a bidirectional DC / DC converter when executing the computer program.

[0041] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the overload processing method of the bidirectional DC / DC converter as described above is implemented.

[0042] In the overload handling method of the bidirectional DC / DC converter provided in the embodiment of the present invention, the DC current flowing through the bidirectional DC / DC converter is graded in advance, and when the DC current corresponding to the power battery side or the inverter side of the bidirectional DC / DC converter is detected, the current level matched by the DC current is obtained, and the bidirectional DC / DC converter is overloaded according to the overload handling method corresponding to the current level. By performing overload handling on the DC / DC converter in a graded manner, it is avoided that the electric drive system directly exits the voltage management of the DC side of the inverter and shuts down the fully controlled switching device when the bidirectional DC / DC converter fails, and the voltage management of the DC side of the inverter is guaranteed to the maximum extent, solving the problem of high possibility of failure of the driving process when using a bidirectional DC / DC converter in the prior art, and also solving the problem that the bidirectional DC / DC converter is prone to failure or even damage, thereby protecting the components in the bidirectional DC / DC converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 is a schematic structural diagram of a bidirectional DC / DC converter provided by an embodiment of the present invention;

[0045] Figure 2 is a flow chart of an implementation method of an overload processing method of a bidirectional DC / DC converter provided by an embodiment of the present invention;

[0046] Figure 3 is a flow chart of an implementation method of an overload processing method of a bidirectional DC / DC converter provided by another embodiment of the present invention;

[0047] Figure 4 It is a principle block diagram of an overload processing device of a bidirectional DC / DC converter in one embodiment of the present invention;

[0048] Figure 5 is a schematic diagram of a computer device in one embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] The following is a detailed description of the overload handling method of the bidirectional DC / DC converter provided in this embodiment. In the manner in which the power battery is connected to the inverter through a bidirectional DC / DC converter, when the bidirectional DC / DC converter fails, the electric drive system will directly exit the voltage management of the DC side of the inverter, so that the power obtained by the electric drive system from the power battery is limited; if the overload capacity of the bidirectional DC / DC converter is exceeded, the electric drive system will also turn off the fully controlled switching device. Once a large power feedback occurs, it is easy for the bidirectional DC / DC converter to fail or even be damaged due to excessive voltage. In view of this, the embodiment of the present invention grades the DC current flowing through the bidirectional DC / DC converter and implements graded overload processing, which maximizes the voltage management of the DC side of the inverter, solves the problem that the bidirectional DC / DC converter is prone to failure or even damage, and effectively protects the components in the bidirectional DC / DC converter.

[0051] In this embodiment, the bidirectional DC / DC converter includes at least one phase bridge arm. Each phase bridge arm includes an upper bridge arm and a lower bridge arm with the same structure, and each bridge arm includes a fully controlled switch device and an uncontrolled switch device connected in parallel. The fully controlled switch device includes but is not limited to IGBT. The uncontrolled switch device includes but is not limited to power crystal diode. Figure 1 , which is a schematic diagram of the structure of a bidirectional DC / DC converter provided by an embodiment of the present invention. Figure 1 The bidirectional DC / DC converter includes a single-phase bridge arm, the upper bridge arm includes a fully controlled switch device VT1 and an uncontrolled switch device VD1, and the lower bridge arm includes a fully controlled switch device VT2 and an uncontrolled switch device VD2. The left side of the bidirectional DC / DC converter is connected to a power battery, and the right side is connected to an inverter. The other end of the inverter is connected to a motor.

[0052] Figure 2 The present invention provides a flow chart of an overload processing method for a bidirectional DC / DC converter. Figure 2 As shown, the overload processing method includes:

[0053] In step S101, a direct current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter is detected at a preset time interval.

[0054] Here, this embodiment detects the direct current flowing through the bidirectional DC / DC converter in real time according to a preset time interval. The direct current may be the direct current of the bidirectional DC / DC converter connected to the power battery side, such as Figure 1 The DC current may also be the DC current of the bidirectional DC / DC converter connected to the inverter side, such as Figure 1 The current at sampling point B.

[0055] In step S102, the current level matched by the direct current is obtained.

[0056] Here, this embodiment divides multiple current levels according to the urgency of overload processing. Each current level corresponds to a current interval and an overload processing method. When the detected DC current falls within a current interval corresponding to a current level, the DC current matches the current interval.

[0057] In step S103, overload processing is performed on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level.

[0058] Optionally, in this embodiment, the overload processing methods are divided according to the urgency of the overload processing, including but not limited to primary current limiting and voltage reduction, secondary current limiting and voltage reduction, and exiting the voltage management on the DC side of the inverter, etc., with the severity increasing in turn. Each overload processing method corresponds to a current level. This embodiment performs different current limiting processing for different urgency levels according to the overload processing method corresponding to the current level matched by the detected DC current.

[0059] By performing overload processing on the DC / DC converter in different levels, the electric drive system is prevented from directly exiting the voltage management on the DC side of the inverter when the bidirectional DC / DC converter fails, thereby ensuring the voltage management on the DC side of the inverter to the maximum extent. The problem of the bidirectional DC / DC converter being prone to failure or even damage due to frequent shutdown of the fully-controlled switching devices by the electric drive system is also avoided, thereby effectively protecting the components in the bidirectional DC / DC converter.

[0060] Optionally, as a preferred example of the present invention, the current level includes five levels, namely, the first current level, the second current level, the third current level, the fourth current level and the fifth current level. Among them, the first current level is a normal current range, and the bidirectional DC / DC converter can operate normally under the first current level. The second current level, the third current level, the fourth current level and the fifth current level are abnormal current ranges, and the bidirectional DC / DC converter needs to be overloaded under the second current level or the third current level or the fourth current level or the fifth current level. Among them, the current intervals corresponding to the second current level, the third current level, the fourth current level and the fifth current level increase in sequence, and the overload processing degree of the bidirectional DC / DC converter deepens in sequence. The overload processing method corresponding to the second current level is a primary current limiting and voltage reduction processing, the overload processing method corresponding to the third current level is a secondary current limiting and voltage reduction processing, the overload processing method corresponding to the fourth current level is the upper bridge arm shutdown, and the overload processing method corresponding to the fifth current level is the full bridge arm shutdown.

[0061] When the current level includes a first current level, such as Figure 3 As shown, the step S103 of performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0062] In step S301, when the direct current matches the first current level, the first timer and the second timer are reset to zero respectively.

[0063] Here, the first timer and the second timer are both buffer delay timers in the overload processing mode corresponding to the second current level and the third current level. When the DC circuit matches the first current level, it means that the bidirectional DC / DC converter is not overloaded, or the bidirectional DC / DC converter recovers to normal after being overloaded. At this time, the values ​​of the first timer and the second timer are reset to zero to clear the overload processing mode corresponding to the second current level or the third current level, so as to prepare for the subsequent DC current overload again.

[0064] In step S302, the current limiting threshold of the bidirectional DC / DC converter is cancelled.

[0065] In this embodiment, if the current limiting threshold is cancelled, the current limiting and voltage reducing process of the bidirectional DC / DC converter is cancelled to ensure that the bidirectional DC / DC converter exits the current limiting and voltage reducing process corresponding to the second current level or the third current level.

[0066] In step S303, the third timer and the fourth timer are controlled to start timing respectively.

[0067] Here, the third timer and the fourth timer are respectively the recovery delay timers in the overload processing methods corresponding to the fourth current level and the fifth current level.

[0068] In step S304, it is determined whether the third timer reaches the third time limit and whether the fourth timer reaches the fourth time limit.

[0069] When the third timer reaches the third time limit and the fourth timer reaches the fourth time limit, step S305 is executed; otherwise, the process returns to step S304 to continue timing.

[0070] In step S305, the fully controlled switching devices in the bidirectional DC / DC converter are controlled in a preset manner.

[0071] The third time limit and the fourth time limit can be the same or different, and are set according to actual needs. When the third timer reaches the third time limit and the fourth timer reaches the fourth time limit, the overload processing method corresponding to the fourth current level or the overload processing method corresponding to the fifth current level is exited, and the fully controlled switch device in the bidirectional DC / DC converter is controlled again according to the preset conventional logic, so that the bidirectional DC / DC converter resumes normal use.

[0072] In this embodiment, the first current level corresponds to the current range of normal operation of the bidirectional DC / DC converter. As long as the DC current of the bidirectional DC / DC converter matches the first current level, the overload processing corresponding to the second current level, the third current level, the fourth current level, or the fifth current level is exited to prepare for subsequent current detection and overload processing, thereby maximizing the voltage management of the DC side of the inverter.

[0073] As mentioned above, in the current limiting and voltage reduction processing, this embodiment is divided into two current levels, wherein the overload processing method corresponding to the second current level is the first-level current limiting and voltage reduction processing, and the overload processing method corresponding to the third current level is the second-level current limiting and voltage reduction processing. The difference between the first-level current limiting and voltage reduction processing and the second-level current limiting and voltage reduction processing lies in the response time.

[0074] like Figure 3 As shown, the step S103 of performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0075] In step S306, when the direct current matches the second current level, the first timer is controlled to start timing.

[0076] Here, the first timer is used as a buffer delay timer for current limiting processing in the overload processing method corresponding to the second current level, and is used to determine the buffer response time of current limiting processing in the overload processing method corresponding to the second current level. When the DC current matches the second current level, the first timer is controlled to start timing to start the buffer delay.

[0077] In step S307, it is determined whether the first timer reaches a first time upper limit.

[0078] When the first timer reaches the first time upper limit, step S308 is executed; otherwise, the first timer continues timing.

[0079] In step S308, a current limiting threshold of the bidirectional DC / DC converter is set.

[0080] When the first timer reaches the first time limit, the current limiting threshold of the bidirectional DC / DC converter is set, and the bidirectional DC / DC converter is current limited to reduce the maximum voltage on the DC side of the inverter, so as to reduce the DC current of the bidirectional DC / DC converter. The current limiting threshold can be a current value in the first current level.

[0081] In step S309, the DC current after the current limiting threshold is set is detected.

[0082] After the current limiting threshold is set, the direct current of the bidirectional DC / DC converter continues to be detected at preset time intervals.

[0083] In step S310, it is determined whether the DC current after the current limiting threshold is set is less than the current limiting threshold.

[0084] If the DC current after the current limiting threshold is set is less than the current limiting threshold, step S311 is executed, otherwise the process returns to step S309 to continue the detection.

[0085] In step S311 , the maximum value of the adjustable voltage on the DC side of the inverter is set to the current voltage on the DC side of the inverter.

[0086] After setting the current limiting threshold, when the DC current is less than the current limiting threshold, the current voltage on the DC side of the inverter is taken as the maximum value of the adjustable voltage on the DC side of the inverter to perform voltage limiting processing on the bidirectional DC / DC inverter.

[0087] In step S312, the second timer is controlled to start timing.

[0088] Here, the second timer is used as a buffer delay timer for the voltage limiting process in the overload processing mode corresponding to the second current level, and is used to determine the response duration of the voltage limiting process in the overload processing mode corresponding to the second current level. While the voltage limiting process is in progress, the second timer starts timing.

[0089] In step S313, when the second timer reaches the second time upper limit, the current and voltage limiting state is exited.

[0090] When the second timer reaches the second time limit, that is, the duration of the maximum value of the adjustable voltage on the DC side of the inverter being maintained at the set voltage reaches the second time limit, the current and voltage limiting process is exited. This embodiment effectively avoids the problem of frequent voltage fluctuations on the DC side of the inverter and ensures the stability of the DC voltage by performing voltage limiting processing on the bidirectional DC / DC converter and adding buffering measures when the DC current is less than the current limiting threshold.

[0091] After step S313, the process returns to step S101. Since the DC current is less than the current limiting threshold, that is, until the DC current drops to the first current level, the first timer and the second timer are reset to zero respectively, and the current limiting threshold of the bidirectional DC / DC converter is cancelled. When the third timer reaches the third time upper limit and the fourth timer reaches the fourth time upper limit, the fully controlled switch device in the bidirectional DC / DC converter is controlled in a preset manner, so that the bidirectional DC / DC converter returns to normal.

[0092] like Figure 3 As shown, when the DC current matches the third current level, since the urgency of the third current level is higher than that of the second current level, the overload handling method corresponding to the third current level, compared with the overload handling method corresponding to the second current level, does not need to be buffered by the first timer for delay timing, and directly jumps to step S308 to set the current limiting threshold of the bidirectional DC / DC converter.

[0093] This embodiment can effectively reduce the maximum voltage on the DC side of the inverter by performing current and voltage limiting processing on the bidirectional DC / DC converter, and then divide the current into two levels, namely the second current level and the third current level. The first timer in the overload processing method corresponding to the second current level can avoid easily triggering the current limiting processing, especially in the case of a short-term current spike that is acceptable to the bidirectional DC / DC converter; the overload processing method corresponding to the second current level and the second timer in the overload processing method corresponding to the third current level can avoid frequent voltage fluctuations on the DC side of the inverter after the current limiting processing is triggered, so that the bidirectional DC / DC converter will not easily exit the voltage management on the DC side of the inverter.

[0094] When the current level includes a fourth current level, as Figure 3 As shown, the step S103 of performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0095] In step S314, when the direct current matches the fourth current level, the third timer is cleared.

[0096] As shown above, the third timer is a recovery delay timer in the overload processing method corresponding to the fourth current level, which is used to determine the delay time for the bidirectional DC / DC converter to resume normal control. Therefore, when the DC current matches the fourth current level, the third timer needs to be cleared first to prepare for the subsequent overload processing method corresponding to the fourth current level.

[0097] In step S315, the fully-controlled switching device located in the upper bridge arm of the bidirectional DC / DC converter is started, and the fully-controlled switching device located in the lower bridge arm is turned off.

[0098] For each phase bridge arm in the bidirectional DC / DC converter, the fully controlled switch device of the lower bridge arm is turned off, while the fully controlled switch device of the upper bridge arm is kept in the started state, and the DC voltage on the DC side of the inverter is no longer adjusted. Here, starting the fully controlled switch device of the upper bridge arm and turning off the fully controlled switch device of the lower bridge arm is a transition state of the fully controlled switch device from the fully open state to the fully closed state. By only turning off the fully controlled switch device of the lower bridge arm, the voltage management on the DC side of the inverter can be exited to reduce the component loss in the bidirectional DC / DC converter, and the normal motor drive and feedback functions can be guaranteed to enable the electric vehicle to run normally.

[0099] After step S315, when the direct current drops to the first current level, the process returns to step S101, triggering the third timer and the fourth timer to start timing. When the third timer reaches the third time limit and the fourth timer reaches the fourth time limit, the fully controlled switch device in the bidirectional DC / DC converter is controlled in a preset manner to restore the bidirectional DC / DC converter to normal.

[0100] When the current level includes a fifth current level, as Figure 3 As shown, the step S103 of performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes:

[0101] In step S316, when the DC current matches the fifth current level, the fourth timer is cleared.

[0102] As shown above, the fourth timer is a recovery delay timer in the overload processing method corresponding to the fifth current level, and is used to determine the delay time for the bidirectional DC / DC converter to resume normal control after executing the overload processing method corresponding to the fifth current level. Therefore, when the DC current matches the fifth current level, the fourth timer needs to be cleared first to prepare for the subsequent overload processing method corresponding to the fifth current level.

[0103] In step S317, all fully-controlled switching devices in the bidirectional DC / DC converter are turned off.

[0104] When the DC current flowing through the bidirectional DC / DC converter reaches the fifth current level, this embodiment immediately turns off the fully-controlled switching devices of the upper bridge arm and the lower bridge arm in the bidirectional DC / DC converter, and exits the voltage management of the DC side of the inverter to perform self-protection and reduce component losses in the bidirectional DC / DC converter.

[0105] After step S317, when the direct current drops to the first current level, the process returns to step S101, triggering the third timer and the fourth timer to start timing. When the third timer reaches the third time limit and the fourth timer reaches the fourth time limit, the fully controlled switch device in the bidirectional DC / DC converter is controlled in a preset manner to restore the bidirectional DC / DC converter to normal.

[0106] This embodiment implements a graded overload handling method by grading the DC current flowing through the bidirectional DC / DC converter, thereby maximally ensuring the voltage management function of the bidirectional DC / DC converter on the DC side of the inverter and effectively reducing the component loss in the bidirectional DC / DC converter.

[0107] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0108] In one embodiment, a bidirectional DC / DC converter overload processing device is provided, and the bidirectional DC / DC converter overload processing device corresponds to the bidirectional DC / DC converter overload processing method in the above embodiment. Figure 4 As shown, the overload processing device of the bidirectional DC / DC converter includes a detection module 41, an acquisition module 42, and a processing module 43. The functional modules are described in detail as follows:

[0109] A detection module 41, configured to detect a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval;

[0110] An acquisition module 42, used for acquiring a current level matched by the DC current;

[0111] The processing module 43 is used to perform overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level.

[0112] Optionally, when the current level is the first current level, the processing module 43 is used to:

[0113] When the DC current matches the first current level, the first timer and the second timer are reset to zero respectively;

[0114] Canceling the current limiting threshold of the bidirectional DC / DC converter;

[0115] Control the third timer and the fourth timer to start timing respectively;

[0116] When the third timer reaches a third time upper limit and the fourth timer reaches a fourth time upper limit, the fully controlled switching device in the bidirectional DC / DC converter is controlled in a preset manner.

[0117] Optionally, when the current level is the second current level, the processing module 43 is used to:

[0118] When the DC current matches the second current level, controlling the first timer to start timing;

[0119] Determine whether the first timer reaches a first time limit;

[0120] If so, setting a current limiting threshold of the bidirectional DC / DC converter;

[0121] Detect the DC current after the current limit threshold is set;

[0122] When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter;

[0123] Controlling the second timer to start timing;

[0124] When the second timer reaches the second time upper limit, the pressure limiting state is exited.

[0125] Optionally, when the current level is the third current level, the processing module 43 is used to:

[0126] When the direct current matches the third current level, setting a current limiting threshold of the bidirectional DC / DC converter;

[0127] Detect the DC current after the current limit threshold is set;

[0128] When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter;

[0129] Controlling the second timer to start timing;

[0130] When the second timer reaches the second time upper limit, the pressure limiting state is exited.

[0131] Optionally, when the current level is the fourth current level, the processing module 43 is used to:

[0132] When the DC current matches the fourth current level, clearing the third timer;

[0133] The fully controlled switch device located in the upper bridge arm of the bidirectional DC / DC converter is started, and the fully controlled switch device located in the lower bridge arm is turned off.

[0134] Optionally, when the current level is the fifth current level, the processing module 43 is used to:

[0135] When the DC current matches the fifth current level, clearing the fourth timer;

[0136] All fully controlled switching devices in the bidirectional DC / DC converter are turned off.

[0137] Optionally, the bidirectional DC / DC converter includes at least one phase bridge arm.

[0138] For the specific definition of the overload processing device of the bidirectional DC / DC converter, please refer to the definition of the overload processing method of the bidirectional DC / DC converter in the above text, which will not be repeated here. Each module in the above-mentioned overload processing device of the bidirectional DC / DC converter can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0139] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for handling overload of a bidirectional DC / DC converter is implemented.

[0140] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0141] Detecting a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval;

[0142] Obtaining a current level matched by the direct current;

[0143] The bidirectional DC / DC converter is overloaded according to the overload processing method corresponding to the current level.

[0144] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0145] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0146] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for handling overload of a bidirectional DC / DC converter, characterized in that: The method comprises: Detecting a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval; Obtaining a current level matched by the direct current; performing overload processing on the bidirectional DC / DC converter according to the overload processing mode corresponding to the current level, wherein the overload processing mode is divided according to the urgency of the overload processing; Wherein, when the current level is the first current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the DC current matches the first current level, the first timer and the second timer are cleared respectively, wherein the first timer and the second timer are both buffer delay timers in the overload processing mode corresponding to the second current level and the third current level; Canceling the current limiting threshold of the bidirectional DC / DC converter; Controlling a third timer and a fourth timer to start timing respectively, wherein the third timer and the fourth timer are recovery delay timers in the overload processing modes corresponding to the fourth current level and the fifth current level respectively; When the third timer reaches a third time upper limit and the fourth timer reaches a fourth time upper limit, the fully controlled switching device in the bidirectional DC / DC converter is controlled in a preset manner.

2. The overload processing method of the bidirectional DC / DC converter according to claim 1, characterized in that: When the current level is the second current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the DC current matches the second current level, controlling the first timer to start timing; Determine whether the first timer reaches a first time limit; If so, setting a current limiting threshold of the bidirectional DC / DC converter; Detect the DC current after the current limit threshold is set; When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter; Controlling the second timer to start timing; When the second timer reaches the second time upper limit, the pressure limiting state is exited.

3. The overload processing method of the bidirectional DC / DC converter according to claim 1, characterized in that: When the current level is the third current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the direct current matches the third current level, setting a current limiting threshold of the bidirectional DC / DC converter; Detect the DC current after the current limit threshold is set; When the DC current after the current limiting threshold is set is less than the current limiting threshold, setting the maximum value of the adjustable voltage on the DC side of the inverter as the current voltage on the DC side of the inverter; Controlling the second timer to start timing; When the second timer reaches the second time upper limit, the pressure limiting state is exited.

4. The overload processing method of the bidirectional DC / DC converter according to claim 1, characterized in that: When the current level is the fourth current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the DC current matches the fourth current level, clearing the third timer; The fully controlled switch device located in the upper bridge arm of the bidirectional DC / DC converter is started, and the fully controlled switch device located in the lower bridge arm is turned off.

5. The overload processing method of the bidirectional DC / DC converter according to claim 1, characterized in that: When the current level is the fifth current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the DC current matches the fifth current level, clearing the fourth timer; All fully controlled switching devices in the bidirectional DC / DC converter are turned off.

6. The overload processing method of a bidirectional DC / DC converter according to any one of claims 1 to 5, characterized in that: The bidirectional DC / DC converter includes at least one phase bridge arm.

7. An overload processing device for a bidirectional DC / DC converter, characterized in that: The device comprises: A detection module, used to detect a DC current corresponding to a power battery side or an inverter side of the bidirectional DC / DC converter at a preset time interval; An acquisition module, used for acquiring a current level matched by the DC current; a processing module, configured to perform overload processing on the bidirectional DC / DC converter according to an overload processing method corresponding to the current level, wherein the overload processing method is divided according to the urgency of the overload processing; Wherein, when the current level is the first current level, performing overload processing on the bidirectional DC / DC converter according to the overload processing method corresponding to the current level includes: When the DC current matches the first current level, the first timer and the second timer are cleared respectively, wherein the first timer and the second timer are both buffer delay timers in the overload processing mode corresponding to the second current level and the third current level; Canceling the current limiting threshold of the bidirectional DC / DC converter; Controlling a third timer and a fourth timer to start timing respectively, wherein the third timer and the fourth timer are recovery delay timers in the overload processing modes corresponding to the fourth current level and the fifth current level respectively; When the third timer reaches a third time upper limit and the fourth timer reaches a fourth time upper limit, the fully controlled switching device in the bidirectional DC / DC converter is controlled in a preset manner.

8. A terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the overload processing method for the bidirectional DC / DC converter according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the overload processing method of the bidirectional DC / DC converter according to any one of claims 1 to 6 is implemented.

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