CN112448425B

CN112448425B - Fault processing method, system and storage medium thereof

Info

Publication number: CN112448425B
Application number: CN201910814685.6A
Authority: CN
Inventors: 刘伟冬; 王兴辉; 王超
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2023-03-14
Anticipated expiration: 2039-08-30
Also published as: CN112448425A

Abstract

The application relates to the technical field of electronics, and provides a fault positioning method, a fault positioning system and a storage medium thereof, wherein the fault processing method is applied to a circuit comprising a boosting module, the boosting module comprises at least three-phase bridge arms, and the fault processing method comprises the following steps: when a fault signal is received, acquiring a first power parameter of the output end of the boosting module; judging whether the current fault is a sustainable charging fault or not according to the first power parameter; if the charging failure is a sustainable charging failure, controlling at least one phase of bridge arm of the boosting module to enter a working state, acquiring a second power parameter of the output end of the boosting module in the current working state, and analyzing the second power parameter to determine a failed bridge arm of the boosting module; if the non-sustainable charging fails, the charging operation is stopped. The problem of have in the prior art when some bridge arms of on-vehicle charger that contains heterogeneous boost circuit broke down, can't fix a position the trouble bridge arm, can't realize carrying out accurate maintenance to the trouble bridge arm, and then leads to the extravagant resource is solved.

Description

Fault processing method, system and storage medium thereof

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a fault handling method and system, and a storage medium thereof.

Background

In recent years, as the technology of electric vehicles is continuously mature, the market acceptance of electric vehicles is continuously improved, more and more electric vehicles enter the society and families, great convenience is brought to people going out, and the vehicle-mounted charger is used as an important part on the electric vehicle and can guarantee the charging and discharging process of a battery. Currently, a multiphase boost converter or step-up converter is mostly adopted in the market to correct a power factor in a direct current charging process, so as to improve the efficiency and quality of battery charging. However, the multi-phase boost circuit generally needs to adopt multi-phase bridge arms, when some of the bridge arms have faults, the vehicle-mounted charger cannot work, and meanwhile, because the fault bridge arms in the multi-phase boost circuit cannot be positioned currently, the fault bridge arms in the multi-phase boost circuit cannot be maintained when some of the bridge arms have faults.

In summary, when some of the bridge arms in the on-board chargers in the market are failed, the failed bridge arm in the on-board charger cannot be located, so that the on-board charger or the entire multiphase booster circuit needs to be replaced. Therefore, in the prior art, when a part of bridge arms in a vehicle-mounted charger comprising a multi-phase booster circuit have faults, the fault bridge arms cannot be positioned, and the fault bridge arms cannot be accurately maintained, so that the problem of resource waste is caused.

Disclosure of Invention

The application aims to provide a fault processing method, a fault processing system and a storage medium thereof, and aims to solve the problems that when part of bridge arms in a vehicle-mounted charger comprising a multi-phase booster circuit have faults, the fault bridge arms cannot be positioned, the fault bridge arms cannot be accurately maintained, and further resources are wasted.

A first embodiment of the present application provides a fault location method, which is applied to a circuit including a boost module, where the boost module includes at least a three-phase bridge arm, and the fault processing method includes:

when a fault signal is received, acquiring a first power parameter of the output end of the boosting module;

judging whether the current fault is a sustainable charging fault or not according to the first power parameter;

if the charging failure is a sustainable charging failure, controlling at least one phase of bridge arm of the boosting module to enter a working state, acquiring a second power parameter of the output end of the boosting module in the current working state, and analyzing the second power parameter to determine a failed bridge arm of the boosting module;

if the non-sustainable charging fails, the charging operation is stopped.

A second embodiment of the present application provides a fault location system, comprising:

the first power parameter acquisition module is used for acquiring a first power parameter of the output end of the boosting module when the fault information is received;

the judging module is used for judging whether the current fault is a sustainable charging fault according to the first power parameter;

the fault bridge arm positioning module is used for controlling at least one phase of bridge arm of the boosting module to enter a working state if the charging is a sustainable charging fault, acquiring a second power parameter of the output end of the boosting module in the current working state and analyzing the second power parameter to determine a fault bridge arm of the boosting module;

and the charging stopping execution module is used for stopping the charging operation if the non-sustainable charging fails.

A third embodiment of the present application provides a storage medium storing a computer program which, when executed by a processor, implements the fault localization method as provided by the first embodiment of the present application.

The application provides a fault processing method, a system and a storage medium thereof, in the fault processing method, firstly, when a fault signal is received, a first power parameter of an output end of a boost module is obtained, then whether a current fault is a sustainable charging fault or not is judged according to the first power parameter, if the current fault is the sustainable charging fault, at least one phase bridge arm of the boost module is controlled to enter a working state, a second power parameter of the output end of the boost module in the current working state is obtained, the second power parameter is analyzed to determine a fault bridge arm of the boost module, and if the current fault is a non-sustainable charging fault, the charging operation is stopped. Through the implementation of the method and the device, whether the fault circuit can be continuously charged or not can be judged, and the fault circuit in the fault bridge arm in the boost module is positioned, so that the fault bridge arm can be accurately maintained, and the problem of resource waste caused by the damage of the boost module is reduced.

Drawings

Fig. 1 shows a block schematic diagram of a PFC module according to a first embodiment of the present application;

fig. 2 shows a further block schematic diagram of a PFC module according to a first embodiment of the present application;

fig. 3 shows a circuit topology of a PFC module according to a first embodiment of the present application;

FIG. 4 is a schematic diagram showing the steps of the fault handling method according to the first embodiment of the present application;

FIG. 5 is a schematic diagram illustrating steps of another fault handling method according to the first embodiment of the present application;

FIG. 6 is a schematic circuit flow diagram illustrating a first embodiment of the present application;

FIG. 7 shows a further circuit flow diagram of the first embodiment of the present application;

FIG. 8 shows a further circuit flow diagram of the first embodiment of the present application;

FIG. 9 is a further circuit flow diagram of the first embodiment of the present application;

FIG. 10 shows a further circuit flow diagram of the first embodiment of the present application;

FIG. 11 shows a further circuit flow diagram of the first embodiment of the present application;

fig. 12 is a diagram showing an example of a circuit structure of an application scenario of the fault handling method according to the first embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

A first embodiment of the present application provides a fault handling method that should be applied to a circuit including a boost module that includes at least three-phase legs, as shown in fig. 1.

In order to more clearly understand the technical content of the present embodiment, the following describes the circuit structure of the boost module in detail:

as shown in fig. 1, the first ends of the arms in the boost module are connected together to form a first bus end of the boost module, the second ends of the arms in the boost module are connected together to form a second bus end of the boost module, the midpoint of each arm in the boost module is connected to the first end of the dc port 21 through an inductor, the first bus end is connected to the first end of the power battery 22, and the second bus end is connected to the second end of the dc port 21 and the second end of the power battery 22.

When the boost module works and the direct current port 21 outputs direct current, each bridge arm in the boost module outputs boosted direct current according to a time sequence or simultaneously so as to supply power to the power battery 22.

Note that the dc port 21 can output dc power, or dc power can be input to the dc port 21; the power cell 22 can output direct current, or direct current can be input to the power cell 22. Meanwhile, the working state that the direct current is input into the direct current port 21 and the power battery 22 receives the direct current is regarded as a charging mode; the working state that the power battery 22 outputs direct current and the direct current port 21 receives the direct current is regarded as a discharging mode; since the currents of the charging mode and the discharging mode are just opposite, and the process of operating the boosting module at the same time is similar, the working state of the boosting module in the charging mode will be described in the present application, and the working state of the boosting module in the discharging mode will not be described again.

In addition, when the dc port 21 outputs dc power, the dc port 21 should be connected to dc electric equipment; when dc power is input to the dc port 21, the dc port 21 should be connected to a dc power supply apparatus. While the power cell 22 described in this embodiment is capable of storing or releasing electrical energy.

Further, as shown in fig. 2, the boost module of the present embodiment may further include m inductance and capacitance modules 14, where the number of bridge arms in the boost module is m, m is greater than or equal to 3, and m is a positive integer.

As shown in fig. 2, the first ends of the m inductors are connected to the dc port 21, the second ends of the m inductors are connected to the middle points of the bridge arms in the boost module in a one-to-one correspondence manner, the first end of the capacitor module 14 is connected to the first bus end, and the second end of the capacitor module 14 is connected to the second bus end.

Further, in order to understand the structure of the boost module in this embodiment more clearly, as shown in fig. 3, a circuit topology diagram of the boost module in this embodiment is described in detail.

As shown in fig. 3, the boost module includes a first phase arm 11, a second phase arm 12, and a third phase arm 13, the capacitor module 14 includes C1, and the three inductors are respectively an inductor L1, an inductor L2, and an inductor L3.

Specifically, the first phase bridge arm 11 includes a first power switch Q1 and a second power switch Q2 connected in series, the second phase bridge arm 12 includes a third power switch Q3 and a fourth power switch Q4 connected in series, the third phase bridge arm 13 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series, first ends of the first power switch Q1, the third power switch Q3 and the fifth power switch Q5 are connected in common to form a first junction end, second ends of the second power switch Q2, the fourth power switch Q4 and the sixth power switch Q6 are connected in common to form a second junction end, a common point formed by a second end of the first power switch Q1 and a first end of the second power switch Q2 is a midpoint of the first phase bridge arm 11, a common point formed by a second end of the third power switch Q3 and a first end of the fourth power switch Q4 is a midpoint of the second phase bridge arm 12, a common junction formed by the second end of the fifth power switch Q5 and the first end of the sixth power switch Q6 is used as a midpoint of the third phase arm 13, a common junction formed by the first end of the inductor L1, the first end of the inductor L2, and the first end of the inductor L3 is connected to the first end of the dc port 21, the second end of the inductor L1, the second end of the inductor L2, and the second end of the inductor L3 are connected to the midpoint of the first phase arm 11, the midpoint of the second phase arm 12, and the midpoint of the third phase arm 13 in a one-to-one correspondence manner, the capacitor C1 is connected between the first bus end and the second bus end, the first bus end is connected to the first end of the power battery 22, and the second bus end is connected to the second end of the dc port 21 and the second end of the power battery 22, respectively.

When the direct current port 21 is connected with a direct current power supply device, the inductor L1 and the second power switch Q2 form a direct current charging energy storage loop, and the direct current power supply device, the inductor L1, the second power switch Q1 and the power battery 22 form a direct current charging energy release loop; the direct current power supply equipment, the inductor L2 and the fourth power switch Q4 form a direct current charging energy storage loop, and the direct current power supply equipment, the inductor L2, the fourth power switch Q3 and the power battery 22 form a direct current charging energy release loop; the direct-current power supply equipment, the inductor L3 and the sixth power switch Q6 form a direct-current charging energy storage loop, and the direct-current power supply equipment, the inductor L3, the sixth power switch Q5 and the power battery form a direct-current charging energy release loop.

In the process of the direct current charging energy storage loop, energy storage of the inductor is completed, and in the direct current charging energy release loop, the boosted direct current is output by the boosting module to supply power to the direct current electric equipment while energy storage and release of the inductor are completed.

The circuit module of the boost module applied to the fault handling method of the present embodiment is described above, and the circuit topology shown in fig. 3 is taken as an example to explain the circuit structure of the boost module.

It should be noted that, in order to be able to describe the technical content of the first embodiment of the present application in more detail, the fault handling method of the first embodiment will be described below with a circuit topology diagram of a boost module as shown in fig. 3. In addition, the circuit topology shown in fig. 3 should not be taken as evidence for limiting the first embodiment of the present application, and is only used for illustrating the scheme of the first embodiment of the present application.

Specifically, as shown in fig. 4, the fault handling method includes the following steps:

s1: when the fault signal is received, a first power parameter of the output end of the boosting module is obtained.

For the step S1, the fault signal includes a related signal indicating that the boost module is detected to be abnormal; the output end of the boosting module comprises a first junction end and a second junction end; the first power parameter includes a voltage difference between the first bus terminal and the second bus terminal. That is, when a fault signal is received, a voltage difference between the first bus end and the second bus end of the boost module needs to be detected; taking the circuit topology shown in fig. 3 as an example, at this time, the voltage across the capacitor C1 is detected, and the voltage across the capacitor is taken as the first power parameter.

S2: and judging whether the current fault is a sustainable charging fault or not according to the first power parameter.

For the step S2, when a sustainable charging fault occurs, the boost module can continue to charge, and at this time, the boost module should include at least one non-faulty bridge arm; under the condition that a non-sustainable charging fault occurs, the boosting module cannot continue to charge, and all bridge arms in the boosting module are in a fault state at the moment.

S31: and if the charging failure is a sustainable charging failure, controlling at least one phase of bridge arm of the boost module to enter a working state, acquiring a second power parameter of the output end of the boost module in the current working state, and analyzing the second power parameter to determine a failed bridge arm of the boost module.

For the above step S31, the second power parameter includes a voltage value difference between the first bus terminal and the second bus terminal. It should be noted that at least one phase of bridge arm of the boost module is controlled to enter a working state, a second power parameter of the output end of the boost module in the current working state is acquired, the second power parameter is analyzed, and whether a faulty bridge arm exists in the at least one phase of bridge arm entering the working state in the current state is judged.

Further, as an implementation manner of this embodiment, the step S31 includes the following steps:

at least two phases of bridge arms of the boosting module enter a working state; acquiring a second power parameter of the output end of the boosting module in the current working state;

the step of analyzing the second power parameter to determine a failed leg of the boost module includes:

judging whether the second power parameter is a second preset threshold value or not; if the current value is the second preset threshold value, judging that at least two phases of bridge arms have fault bridge arms; and if the current is not the second preset threshold, judging that no fault bridge arm exists in at least two phase bridge arms.

Specifically, the second power parameter includes a voltage difference between the first bus terminal and the second bus terminal; the second preset threshold value represents a range corresponding to a voltage difference value between the first bus end and the second bus end when the a-phase bridge arm is controlled to enter a working state, and represents 1-a-1 phase bridge arm is in a fault state, wherein a is more than or equal to 2, and a is a positive integer.

In addition, whether the bridge arm in the working state has a fault can be judged by judging the current in the boosting module. For example. Specifically, the current of the first phase arm 11, or the second phase arm 12, or the third phase arm 13 may be a current, and when the first phase arm 11, or the second phase arm 12, or the third phase arm 13 is in an operating state, the corresponding arm should have a current, and the current should reach an expected value. That is, when the current passing through the corresponding bridge arm reaches the expected current magnitude, the corresponding bridge arm should have no fault, and when the current does not reach the expected current magnitude, the corresponding bridge arm should have a fault.

In this embodiment, whether a fault exists in at least two phases of bridge arms can be known by judging whether the second power parameter is the second preset threshold.

Further, as an embodiment of the present invention, after the step of determining that the failed bridge arm exists in at least two phase bridge arms, the method includes:

and controlling at least one phase of bridge arms of the at least two phase of bridge arms to enter a working state, acquiring a third power parameter of the output end of the boost module in the current working state, and analyzing the third power parameter to determine a fault bridge arm in the at least two phase of bridge arms.

Wherein the third power parameter is a voltage difference between the first bus terminal and the second bus terminal. Since the analysis and determination process of the third power parameter is similar to that of the second power parameter, it is not described herein again. If the current phase bridge arm enters the working state, whether the current phase bridge arm is a fault bridge arm can be judged by analyzing the third power parameter, and if the current phase bridge arm is the fault bridge arm, the phase bridge arm is recorded; if the current bridge arm is not a failed bridge arm, the judgment of the other bridge arms is continued, and the specific judgment operation is similar to the judgment operation, which is not described again.

Preferably, at least one phase of bridge arm in the boost module is controlled by adopting a bisection method, so that a fault bridge arm and a non-fault bridge arm in the boost module can be quickly acquired.

Further, as an implementation manner of this embodiment, the step S31 further includes the following steps:

one phase of bridge arm of the boosting module enters a working state at the same time; acquiring a second power parameter of the output end of the boosting module in the current working state;

judging whether the second power parameter is a third preset threshold value or not; if the current bridge arm is the third preset threshold, judging that one phase of bridge arm is a fault bridge arm; and if the current bridge arm is not the third preset threshold, judging that one phase bridge arm is not a fault bridge arm.

The third preset threshold is the range of the voltage difference between the first bus end and the second bus end when the previous phase bridge arm is in fault.

When the second power parameter is a third preset threshold, the current phase bridge arm is a fault bridge arm; and when the current phase bridge arm is not a fault bridge arm, judging that the current voltage difference between the first bus end and the second bus end reaches the voltage difference when the current phase bridge arm is not in fault.

S32: if the non-sustainable charging fails, the charging operation is stopped.

For the step S32, when the result of the first power parameter judgment indicates that the voltage boosting module has the non-sustainable charging fault, the following steps are performed: all bridge arms of the boosting module have faults, so that the boosting module cannot continue to be charged and further stops charging.

In this embodiment, first, when a fault signal is received, a first power parameter of an output end of the boost module is obtained, then, whether a current fault is a sustainable charging fault is determined according to the first power parameter, if the current fault is the sustainable charging fault, at least one phase of bridge arm of the boost module is controlled to enter a working state, a second power parameter of the output end of the boost module in the current working state is obtained, the second power parameter is analyzed, so as to determine a faulty bridge arm of the boost module, and if the current fault is a non-sustainable charging fault, the charging operation is stopped. Through the implementation of the embodiment, whether the fault circuit can be continuously charged or not can be judged, and the fault circuit in the fault bridge arm in the boost module is positioned, so that the fault bridge arm can be accurately maintained, and the problem of resource waste caused by the damage of the boost module is reduced.

Further, as an embodiment of the present embodiment, the step S2 specifically includes the following steps:

judging whether the first power parameter is a first preset threshold value or not; if the current fault is the first preset threshold, judging the current fault non-sustainable charging fault; if the current fault is not the first preset threshold, the current fault is judged to be a sustainable charging fault.

Specifically, the first preset value threshold is zero, that is, when the voltage difference between the first bus end and the second bus end is zero, it is determined that the current fault is a non-sustainable charging fault, and at this time, the boost module is in a full fault state; when the voltage difference between the first bus end and the second bus end is not zero, at least one phase of bridge arm in the boosting module has no fault.

In this embodiment, by determining whether the first power parameter is the first preset threshold, it can be determined whether the boost module can continue to perform charging, and if the current fault is a sustainable charging fault, a faultless bridge arm in the boost module can be used to enable the boost module to continue to perform charging operation.

Further, as an implementation manner of this embodiment, after step S31, the following is also included:

and recording the determined fault bridge arm to obtain fault bridge arm information, and sending the fault bridge arm information to the outside.

The fault bridge arm information comprises the number of the fault bridge arms and the corresponding positions of the fault bridge arms. It should be noted that the above "outside" should be in a state that can be known by a serviceman, which is not particularly limited to the outside of the booster module or the outside of the vehicle.

In addition, when partial bridge arms in the boosting module are in fault and fault information is sent to the outside, the electric control device receives a charging signal and responds to the charging signal, and the charging process is realized through the rest non-fault bridge arms.

In the embodiment, the fault information is sent to the outside, so that the maintenance personnel can obtain the specific information of the fault bridge arm to maintain, the whole boost module does not need to be replaced, only the fault bridge arm is maintained or replaced, and the waste of resources is reduced.

Further, under the condition that the bridge arm with electric control is reused as the bridge arm of the boost module, when the bridge arm of the boost module is detected to have a fault during charging, the drive request is not responded when the drive request is received, and the adoption of the electric control drive motor with the fault bridge arm is avoided, so that the drive safety is improved.

Further, as an implementation manner of this embodiment, after the step S31, as shown in fig. 5, the following is also included:

s33: and (3) taking the actual charging power at the charging pile side, obtaining the maximum allowable charging power at the charging vehicle side, and obtaining the number N of the fault bridge arms in the boosting module.

The actual charging power P1 is the actual charging power output by the charging pile side; the maximum allowable charging power P0 on the charging vehicle side is the minimum value among the cable allowable maximum charging power Pcc, the maximum power Pcp output from the charging box, the maximum charging power Pbms allowed on the vehicle side, and the maximum charging power Pn of the grid current on the charging pile side.

Specifically, the maximum allowable charging power Pcc of the cable and the maximum power Pcp output by the charging box can be obtained according to national standards, and the maximum charging power Pn of the grid current on the charging pile side can be sampled in the grid and obtained through the voltage and current calculation of the grid.

S34: and determining the optimal charging power according to the actual charging power, the maximum allowable charging power and the number N of the fault bridge arms.

For more detailed description, the dc charging is exemplified by using a boost module including a three-phase arm.

If there is a one-phase failed leg: when P1 is not less than P0/2, P0/2 is used as the optimum charging power, and when P1 is less than P0/2, P0/2 is used as the optimum charging power.

If two-phase fault bridge arms exist: when P1 is larger than or equal to P0/4, P0/4 is taken as the optimal charging power, and when P1 is smaller than P0/4, P0/4 is taken as the optimal charging power.

S35: and adjusting the current charging power of the electric pile side to the optimal charging power, and controlling a non-fault bridge arm in the boosting module to enter a working state so as to continuously execute the charging operation.

In addition, it should be noted that some of the non-failed legs may also be turned on to continue the charging operation.

In the present embodiment, by implementing steps S33 to S35, the charging can be performed by using the non-failed arm in the boost module, so that the charging circuit including the boost module can still be charged by using the boost module when some arms fail, and the flexibility of the application of the charging circuit including the boost module is greatly improved.

Further, as an implementation manner of this embodiment, a total number M of bridge arms in the boost module is obtained, and a number K of non-failed bridge arms is obtained according to the total number M of bridge arms and the number N of failed bridge arms; and when K is more than or equal to 2, the K-phase non-fault bridge arms are controlled in a staggered mode, and control signals of the K-phase non-fault bridge arms sequentially differ in phase by 360/K degrees.

It should be noted that when K =1, the non-faulty bridge arm in one phase in the control boost module can still convert the dc power output from the dc port 21 into a boosted dc power to power the power battery 22.

In the embodiment, the power of the non-fault bridge arm with more than two phases is controlled by adopting a staggered control method, so that the current ripple generated when the boost module works can be effectively reduced, the probability of damaging electronic components including the capacitor module is reduced, the charging quality is improved, and the circuit is protected.

In order to more clearly understand the technical content of the present embodiment, a method for determining a faulty bridge arm in the present embodiment will be described below by taking a circuit topology as shown in fig. 3 as an example:

independently conducting the first phase bridge arm 11, detecting the voltage at two ends of the capacitor C1 after the preset time is reached, and judging and recording the fault of the first phase bridge arm 11 when the voltage value does not reach the voltage at two ends of the capacitor C1 when the first phase bridge arm 11 is not in fault; and if the voltage at the two ends of the capacitor C1 reaches the voltage when the first phase bridge arm 11 is in the non-fault state, judging that the first phase bridge arm 11 is in the non-fault state and recording. Or detecting the current of the power switch in the conducting state, and when the current reaches the magnitude of the current of the power switch in the conducting state when the first phase bridge arm 11 is in a non-fault state, judging that the first phase bridge arm 11 is in a non-fault state and recording the non-fault state; when the current does not reach the current of the power switch in the on state when the first phase bridge arm 11 is not in fault, the first phase bridge arm 11 is judged to be in fault and recorded.

It should be noted that turning on first phase leg 11 may include two ways: as shown in fig. 6, one of them is to turn off the first power switch Q1 and turn on the second power switch Q2 to realize energy storage; as shown in fig. 7, the second is to turn off the second power switch Q2 and turn on the first power switch Q1, and at this time, the voltage at the two ends of the capacitor C1 is detected.

The current flow when detecting the second phase arm 12 is shown in fig. 8 and 9, and the current flow when detecting the third phase arm 13 is shown in fig. 10 and 11. The method for detecting whether a fault occurs in the first phase arm 11, the second phase arm 12 and the third phase arm 13 is similar, and is not described herein again.

In addition, in the present embodiment, the fault handling method can also be applied to the circuit topology shown in fig. 12, a direct current can be output or input through the direct current port 21, and a direct current can be output or input through the power battery 22, that is, the direct current port 21 and the power battery 22 are not only referred to as a direct current charging port or a direct current discharging port, but only one scenario in which the fault handling method is applied is given.

In the first embodiment of the application, whether the fault circuit can be continuously charged can be judged, and the fault circuit in the fault bridge arm in the boost module is positioned, so that the fault bridge arm can be accurately maintained, the problem of resource waste caused by damage of the boost module is reduced, when part of bridge arms in the boost module have faults, the non-fault bridge arms can be used for charging, and even the non-fault bridge arms can be controlled in a staggered mode, so that current ripples generated when the boost module works can be effectively reduced.

A second embodiment of the present application provides a fault handling system, which is applied to a circuit including a boost module, as shown in fig. 1, where the boost module includes at least three-phase bridge arms, and a detailed structure of the boost module is described in detail in the first embodiment of the present application, and is not described herein again.

Specifically, the fault handling system includes:

the first power parameter acquisition module is used for acquiring a first power parameter of the output end of the boosting module when the fault signal is received;

Further, as an implementation manner of this embodiment, the fault location system further includes:

the first judging module is used for judging whether the first power parameter is a first preset threshold value or not; if the current fault is the first preset threshold, judging the current fault non-sustainable charging fault; if the current fault is not the first preset threshold, the current fault is judged to be a sustainable charging fault.

the second judging module is used for judging whether the second power parameter is a second preset threshold value or not; if the current bridge arm is the second preset threshold, judging that at least two bridge arms have a fault bridge arm; and if the current is not the second preset threshold, judging that no fault bridge arm exists in at least two phase bridge arms.

and the first control module is used for controlling at least one phase of bridge arms of the at least two phase of bridge arms to enter a working state, acquiring a third power parameter of the output end of the boosting module in the current working state, and analyzing the third power parameter to determine a fault bridge arm in the at least two phase of bridge arms.

the third judging module is used for judging whether the second power parameter is a third preset threshold value or not; if the current value is the third preset threshold value, judging that one phase of bridge arm is a fault bridge arm; and if the current bridge arm is not the third preset threshold, judging that one phase bridge arm is not a fault bridge arm.

and the fault information sending module is used for recording the determined fault bridge arm to obtain fault bridge arm information and sending the fault bridge arm information to the outside.

and the power acquisition module is used for acquiring the actual charging power of the charging pile side, acquiring the maximum allowable charging power of the charging vehicle side and acquiring the number N of the fault bridge arms in the boosting module.

And the optimal power acquisition module is used for determining the optimal charging power according to the actual charging power, the maximum allowable charging power and the number N of the fault bridge arms.

And the power adjusting module is used for adjusting the current charging power at the electric pile side to the optimal charging power and controlling a non-fault bridge arm in the boosting module to enter a working state so as to continuously execute the charging operation.

the bridge arm number acquisition module is used for acquiring the total number M of bridge arms in the boost module and acquiring the number K of non-fault bridge arms according to the total number M of the bridge arms and the number N of fault bridge arms;

and the staggered control module is used for controlling the K-phase non-fault bridge arms in a staggered manner when K is larger than or equal to 2, and the control signals of the K-phase non-fault bridge arms sequentially have a phase difference of 360/K degrees.

Since the specific definition of the fault handling system in the present application can refer to the definition of the fault handling method in the foregoing, detailed description is omitted here. The respective modules in the fault handling system described above may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

A third embodiment of the present application provides a storage medium storing a computer program that, when executed by a processor, implements the fault handling method as provided by the first embodiment of the present application.

The storage medium in the present embodiment stores a computer program, and the computer program realizes the steps of the fault handling method in the first embodiment of the present application when executed by a processor. Alternatively, the computer program, when executed by the processor, implements the functions of each module of the fault handling system in the second embodiment of the present application, and is not described herein again to avoid repetition.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. 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. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A fault handling method is applied to a circuit containing a boost module, wherein the boost module comprises at least three-phase bridge arms, and the fault handling method comprises the following steps:

if the non-sustainable charging fails, stopping the charging operation;

after the step of analyzing the second power parameter to determine the failed leg of the boost module, the method further includes:

acquiring actual charging power of a charging pile side, acquiring maximum allowable charging power of a charging vehicle side, and acquiring the number N of failed bridge arms in the boosting module;

determining the optimal charging power according to the actual charging power, the maximum allowable charging power and the number N of the fault bridge arms;

and adjusting the current charging power of the electric pile side to the optimal charging power, and controlling a non-fault bridge arm in the boosting module to enter a working state so as to continuously execute the charging operation.

2. The method according to claim 1, wherein the step of determining whether the current fault is a sustainable charging fault according to the first power parameter comprises:

judging whether the first power parameter is a first preset threshold value or not;

if the current fault is the first preset threshold, judging that the current fault is not the sustainable charging fault;

and if the current fault is not the first preset threshold, judging that the current fault is the sustainable charging fault.

3. The fault handling method according to claim 1, wherein at least two phase legs of the boost module enter an operating state;

judging whether the second power parameter is a second preset threshold value or not;

if the current value is the second preset threshold value, judging that the at least two phases of bridge arms have fault bridge arms;

and if the current value is not the second preset threshold value, judging that no fault bridge arm exists in the at least two phase bridge arms.

4. The method according to claim 3, wherein after the step of determining that the at least two-phase bridge arm has the failed bridge arm, the method further comprises:

and controlling at least one of the at least two phase bridge arms to enter a working state, acquiring a third power parameter of the output end of the boost module in the current working state, and analyzing the third power parameter to determine a fault bridge arm in the at least two phase bridge arms.

5. The fault handling method according to claim 1, wherein a phase arm of the boost module enters an operating state;

the step of analyzing the second power parameter to determine a faulty bridge arm of the boost module further includes:

judging whether the second power parameter is a third preset threshold value or not;

if the current phase is the third preset threshold, judging that the one-phase bridge arm is a fault bridge arm;

and if the current phase is not the third preset threshold, judging that the one-phase bridge arm is not a fault bridge arm.

6. The method of claim 1, wherein after the step of analyzing the second power parameter to determine a failed leg of the boost module, comprising:

7. The fault handling method according to claim 1, wherein a total number M of bridge arms in the boost module is obtained, and a number K of non-faulty bridge arms is obtained according to the total number M of bridge arms and the number N of faulty bridge arms;

and when K is more than or equal to 2, the K-phase non-fault bridge arms are controlled in a staggered mode, and control signals of the K-phase non-fault bridge arms sequentially differ in phase by 360/K degrees.

8. A fault handling system, comprising:

the fault bridge arm positioning module is used for controlling at least one phase of bridge arm of the boosting module to enter a working state if the charging is a sustainable charging fault, acquiring a second power parameter of the output end of the boosting module in the current working state, and analyzing the second power parameter to determine a fault bridge arm of the boosting module;

a charging stop execution module for stopping the charging operation if the non-sustainable charging fails;

9. A storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the fault handling method according to any one of claims 1 to 7.