CN112448458A

CN112448458A - Fault processing method, system and storage medium thereof

Info

Publication number: CN112448458A
Application number: CN201910814704.5A
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: 2021-03-05
Anticipated expiration: 2039-08-30
Also published as: CN112448458B

Abstract

The application relates to the technical field of electronics, and provides a fault processing method, a system and a storage medium thereof, wherein the fault processing method is applied to a circuit comprising a PFC module, and comprises the following steps: when a fault signal is received, acquiring a first power parameter of an output end of a PFC module; judging whether the current fault is a sustainable charging fault or not according to the first power parameter; if the charging fault is a sustainable charging fault, controlling at least one phase bridge arm and a power frequency bridge arm of the high-frequency bridge arm module to enter a working state, acquiring a second power parameter of the output end of the PFC module in the current working state, and analyzing the second power parameter to determine a fault bridge arm of the high-frequency bridge arm module; if the non-sustainable charging fails, the charging operation is stopped. Through the implementation of the application, the problems that when a part of bridge arms in the existing vehicle-mounted charger comprising the multiphase staggered PFC circuit are in fault, the fault bridge arms cannot be positioned, the fault bridge arms cannot be accurately maintained, and further resources are wasted can be 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 method and a system for processing a fault 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. In the market, a multiphase staggered PFC circuit (Power Factor Correction) is mostly adopted for Power Factor Correction in an alternating current charging process so as to improve the efficiency and quality of battery charging. However, the multiphase interleaving PFC circuit generally needs to adopt multiphase bridge arms, and when some of the bridge arms have faults, the vehicle-mounted charger cannot work, and meanwhile, because the faulty bridge arm in the multiphase interleaving PFC circuit cannot be located at present, the faulty bridge arm in the multiphase interleaving PFC circuit cannot be maintained when some of the bridge arms have faults.

In summary, when some bridge arms in the vehicle-mounted charger in the market are in fault, the fault bridge arm in the vehicle-mounted charger cannot be positioned, so that the vehicle-mounted charger or the whole multiphase staggered PFC circuit needs to be replaced. Therefore, in the prior art, when a part of bridge arms in the vehicle-mounted charger including the multiphase staggered PFC circuit are in fault, 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 of an existing vehicle-mounted charger comprising a multiphase staggered PFC circuit have faults, the fault bridge arms cannot be positioned, accurate maintenance of the fault bridge arms cannot be realized, and resources are wasted.

A first embodiment of the present application provides a fault processing method applied to a circuit including a PFC module, where the PFC module includes a high-frequency bridge arm module and a power-frequency bridge arm, and the high-frequency bridge arm 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 an output end of a PFC module;

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

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

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 that, when executed by a processor, implements the fault handling 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, wherein the fault processing method is applied to a circuit containing a PFC module, the PFC module comprises a high-frequency bridge arm module and a power-frequency bridge arm module, and the high-frequency bridge arm module comprises at least three-phase bridge arms; firstly, when a fault signal is received, acquiring a first power parameter of an output end of a PFC module, judging whether a current fault is a sustainable charging fault according to the first power parameter, if the current fault is the sustainable charging fault, controlling at least one phase bridge arm and a power frequency bridge arm of a high-frequency bridge arm module to enter a working state, acquiring a second power parameter of the output end of the PFC module in the current working state, analyzing the second power parameter to determine a fault bridge arm of the high-frequency bridge arm module, and if the fault signal is a non-sustainable charging fault, stopping charging operation. When a fault signal is received, a first power parameter is obtained, whether the current fault is a sustainable fault or not is judged according to the first power parameter, when the current fault is the sustainable fault, the high-frequency bridge arm module and the power-frequency bridge arm are controlled to enter a working state, a second power parameter is obtained, the second power parameter is analyzed to determine a fault bridge arm in the high-frequency bridge arm module, and when the current fault is a non-sustainable charging fault, the charging operation is stopped. By 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 high-frequency bridge arm module is positioned, so that the fault bridge arm can be accurately maintained, and the problem of resource waste caused by damage of the high-frequency bridge arm 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 illustrating the steps of a fault handling method according to a first embodiment of the present application;

FIG. 5 is a schematic diagram illustrating steps of a further 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 shows 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 shows a circuit topology of the first embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 and includes any and all possible combinations of one or more of the associated listed items.

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 PFC module, as shown in fig. 1, where the PFC module includes a high-frequency leg module 11 and a power-frequency leg 12, and the high-frequency leg module 11 includes at least a three-phase leg.

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

as shown in fig. 1, a first end of each of the high-frequency bridge arms 11 and a first end of the power frequency bridge arm 12 are connected together to form a first bus end of the PFC module, a second end of each of the high-frequency bridge arms 11 and a second end of the power frequency bridge arm 12 are connected together to form a second bus end of the PFC module, a midpoint of each of the high-frequency bridge arms 11 is connected to the first end of the ac port 21 through an inductor, a midpoint of the power frequency bridge arm 12 is connected to the second end of the ac port 21, a first end of the power battery 22 is connected to the first bus end, and a second end of the power battery 22 is connected to the second bus end.

When the PFC module operates and the ac port 21 outputs ac power, the first phase bridge arm 111 and the power frequency bridge arm 12 form a rectifying full bridge, or the second phase bridge arm 112 and the power frequency bridge arm 12 form a rectifying full bridge, or the third phase bridge arm 113 and the power frequency bridge arm 12 form a rectifying full bridge, and the three rectifying full bridges rectify the ac power output from the ac port 21 into dc power to be transmitted to the power battery 22 for charging operation.

Further, when the power battery 22 outputs the direct current, the first phase bridge arm 111 and the power frequency bridge arm 12 form an inverter full bridge, or the second phase bridge arm 112 and the power frequency bridge arm 12 form an inverter full bridge, or the third phase bridge arm 113 and the power frequency bridge arm 12 form an inverter full bridge, and the three inverter full bridges invert the direct current output by the power battery 22 into an alternating current to be transmitted to the alternating current port 21 for discharging operation.

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

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

Further, as shown in fig. 2, the PFC module of this embodiment may further include m inductance and capacitance modules 13, where the number of the bridge arms in the high-frequency bridge arm module 11 is m, m is greater than or equal to 3, and m is a positive integer.

As shown in fig. 2, first ends of the m inductors are connected to the ac port 21, second ends of the m inductors are connected to midpoints of the bridge arms in the high-frequency bridge arm module 11 in a one-to-one correspondence manner, first ends of the capacitor modules 13 are connected to the first bus terminal, and second ends of the capacitor modules 13 are connected to the second bus terminal.

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

As shown in fig. 3, in this case, the high-frequency bridge arm module 11 includes a first phase bridge arm 111, a second phase bridge arm 112, and a third phase bridge arm 113, the capacitor module 13 includes C1, and the three inductors are an inductor L1, an inductor L2, and an inductor L3, respectively.

Specifically, the first phase bridge arm 111 includes a first power switch Q1 and a second power switch Q2 connected in series, the second phase bridge arm 1212 includes a third power switch Q3 and a fourth power switch Q4 connected in series, the third phase bridge arm 113 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series, the power frequency bridge arm 12 includes a seventh power switch Q7 and an eighth power switch Q8 connected in series, first ends of the first power switch Q1, the third power switch Q3, the fifth power switch Q5 and the seventh power switch Q7 are connected in common to form a first junction end, second ends of the second power switch Q2, the fourth power switch Q4, the sixth power switch Q6 and the eighth power switch Q8 are connected in common to form a second junction end, a common junction point formed by the second end of the first power switch Q1 and the first end of the second power switch Q2 is used as a common junction point of the first phase bridge arm 111, and a midpoint formed by a common junction point of the second end of the third power switch Q4 and the fourth power switch Q4 is used as a common junction point formed by the first end of the first phase bridge arm 111 and the second phase switch Q3 In this regard, a common junction formed by the second terminal of the fifth power switch Q5 and the first terminal of the sixth power switch Q6 serves as a midpoint of the third phase leg 113, a common junction formed by the second terminal of the seventh power switch Q7 and the first terminal of the eighth power switch Q8 serves as a midpoint of the power frequency leg 12, a common junction formed by the first terminal of the inductor L1, the first terminal of the inductor L2, and the first terminal of the inductor L3 is connected to the first terminal of the ac port 21, the second terminal of the inductor L1, and the second terminal of the inductor L2, the second end of the inductor L3 is connected with the midpoint of the first phase bridge arm 111, the midpoint of the second phase bridge arm 112 and the midpoint of the third phase bridge arm 113 in a one-to-one correspondence manner, the midpoint of the power frequency bridge arm 12 is connected with the second end of the alternating current port 21, the capacitor C1 is connected between the first bus end and the second bus end, the first bus end is connected with the first end of the power battery 22, and the second bus end is connected with the second end of the power battery 22.

The circuit module of the PFC module applied in 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 describe the circuit structure of the PFC module.

It should be noted that, in order 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 the PFC 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 PFC module is obtained.

For the step S1, the fault signal includes a relevant signal for detecting the abnormality of the PFC module; the output end of the PFC module comprises a first bus end and a second bus end of the PFC module; 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 terminal and the second bus terminal of the PFC 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.

In step S2, when a sustainable charging failure occurs, the PFC module can continue to charge, and at this time, the high-frequency bridge arm module 11 in the PFC module should include at least one non-failed bridge arm, and the power-frequency bridge arm 12 is in a non-failed state; when a non-sustainable charging fault occurs, the PFC module cannot continue to charge, and all the bridge arms in the high-frequency bridge arm module 11 in the PFC module are in a fault state, and/or the power-frequency bridge arm 12 is in a fault state.

S31: and if the charging fault is a sustainable charging fault, controlling at least one phase bridge arm of the high-frequency bridge arm module 11 and the power-frequency bridge arm 12 to enter a working state, acquiring a second power parameter of the output end of the PFC module in the current working state, and analyzing the second power parameter to determine a fault bridge arm of the high-frequency bridge arm module 11.

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 bridge arm of the high-frequency bridge arm module 11 and the power-frequency bridge arm 12 are controlled to enter a working state, a second power parameter of the output end of the PFC module in the current working state is obtained, the second power parameter is analyzed, and whether a faulty bridge arm exists in the at least one phase bridge arm that enters 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 and a power frequency bridge arm of the high-frequency bridge arm module simultaneously enter a working state; acquiring a second power parameter of the output end of the PFC module under the current working state;

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

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.

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 the second preset threshold value represents that the 1-a-1-phase bridge arm is in a fault state, wherein a is not less than 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 PFC module. For example. Specifically, the current of the first phase bridge arm 111, the second phase bridge arm 112, or the third phase bridge arm 113 may be larger, and when the first phase bridge arm 111, the second phase bridge arm 112, or the third phase bridge arm 113 is in a working state, the corresponding bridge arm should have a current, and the current should reach an expected current. 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.

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

and controlling at least one phase of the at least two phase of bridge arms and the power frequency bridge arm 12 to enter a working state, acquiring a third power parameter of the output end of the PFC 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 and the power frequency bridge arm 12 enter the working state, whether the current phase bridge arm is a fault bridge arm can be judged by analyzing the third power parameter; if the current phase bridge arm is a fault bridge arm, recording the phase bridge arm; if the current bridge arm is not the failed bridge arm, the judgment of the other bridge arm is continued, and the specific judgment operation is similar to the judgment operation, which is not described herein again.

Preferably, a bisection method is adopted to control at least one phase of bridge arm in the high-frequency bridge arm module 11, so that a fault bridge arm and a non-fault bridge arm in the high-frequency bridge arm module 11 can be quickly acquired.

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

one phase bridge arm of the high-frequency bridge arm module 11 and the power frequency bridge arm 12 simultaneously enter a working state; acquiring a second power parameter of the output end of the PFC module in the current working state;

the step of analyzing the second power parameter to determine a faulty bridge arm of the high-frequency bridge arm module 11 includes:

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 is not the third preset threshold, judging that the bridge arm of one phase is not the 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 step S32, when the result of the determination according to the first power parameter indicates that the PFC module has a non-sustainable charging fault, the method includes: and all bridge arms of the high-frequency bridge arm module have faults, and/or the power frequency bridge arm has faults, so that the PFC module cannot continue to be charged and stops charging.

Preferably, when the PFC module has a non-sustainable charging fault, the power frequency bridge arm 12 should be replaced, and then the operations are performed according to the above steps, when a fault signal is not received, it indicates that the high frequency bridge arm module 11 has no fault, and when a fault signal is received, it indicates that the high frequency bridge arm module 11 has a fault.

In this embodiment, when a fault signal is received, a first power parameter of the output end of the PFC module is obtained, and then it is determined whether the current fault is a sustainable charging fault according to the first power parameter, if the current fault is a sustainable charging fault, at least one phase bridge arm of the high-frequency bridge arm module 11 and the power-frequency bridge arm 12 are controlled to enter a working state, and a second power parameter of the output end of the PFC module in the current working state is obtained, and the second power parameter is analyzed to determine a faulty bridge arm of the high-frequency bridge arm module 11, and if the current fault is a non-sustainable charging fault, the charging operation is stopped. By implementing the embodiment, whether the fault circuit can be continuously charged can be judged, and the fault circuit in the fault bridge arm in the high-frequency bridge arm module 11 is positioned, so that the fault bridge arm can be accurately maintained, and the problem of resource waste caused by damage of the high-frequency bridge arm module 11 is reduced.

Further, as an embodiment of the present invention, 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, all bridge arms in the high-frequency bridge arm module 11 have a fault, and/or the power frequency bridge arm 12 has a fault, it is determined that the current fault is a non-sustainable charging fault, and at this time, the high-frequency bridge arm module 11 and/or the power frequency bridge arm 12 are in all fault states; 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 high-frequency bridge arm module 11 has no fault, and the power frequency bridge arm 12 has no damage.

In this embodiment, by determining whether the first power parameter is the first preset threshold, it can be determined whether the charging can be continued through the PFC module, and if the current fault is a non-sustainable charging fault, all the arms in the power-frequency arm 12 or the high-frequency arm 11 can be replaced, so that the PFC module can operate normally.

Further, as an implementation manner of this embodiment, after step 31, 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 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 to a serviceman, which is not particularly limited to being outside the PFC module or outside the vehicle.

In addition, when all the bridge arms in the high-frequency bridge arm module 11 and/or the power-frequency bridge arm 12 have faults and send fault information to the outside, the external electric control device receives the charging signal or the driving signal and does not respond to the charging signal or the driving signal.

When the high-frequency bridge arm 12 is not damaged and part of bridge arms in the high-frequency bridge arm module have faults and fault information is sent to the outside, an external electric control device receives a charging signal and responds to the charging signal, and the charging process is realized through the rest non-faulty bridge arms and the power-frequency bridge arm 12.

In the embodiment, the fault information is sent to the outside, so that the maintenance personnel can acquire the specific information of the fault bridge arm to maintain, the maintenance personnel can only maintain or replace the fault bridge arm without replacing the whole PFC module, 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 high-frequency bridge arm module, when the bridge arm with the electric control is charged and the fault of the bridge arm of the high-frequency bridge arm module is detected, the driving request is not responded when the driving request is received, the electric control driving motor of the bridge arm with the fault is avoided, and therefore the driving 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 high-frequency bridge arm module 11.

Wherein, 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 allowable 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 the national standard, and the maximum charging power Pn of the grid current on the charging pile side can be sampled in the grid and calculated according to the voltage and the current 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 explanation, ac charging using a high-frequency bridge arm module including a three-phase bridge arm is exemplified.

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

If two-phase fault bridge arms exist: when P1 is not less than P0/4, P0/4 is the optimum charging power, and when P1 < P0/4, P0/4 is the optimum 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 and a power frequency bridge arm 12 in the high-frequency bridge arm module 11 to enter a working state so as to continuously execute the charging operation.

Each non-fault bridge arm and the power frequency bridge arm 12 form each rectifying full bridge to convert alternating current into direct current.

In addition, it should be noted that part of the non-faulty bridge arm and the power frequency bridge arm 12 may also be turned on to continue the charging operation.

In the present embodiment, through the implementation of steps S33 to S35, the charging can be performed by using the non-failed arm in the high-frequency arm module 11, so that the charging circuit including the PFC module can still be charged by using the PFC module when a part of the arms fail, and the flexibility of the application of the charging circuit including the PFC module is greatly improved.

Further, as an implementation manner of this embodiment, a total number M of bridge arms in the high-frequency bridge arm module 11 is obtained, and the 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 larger 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 have a phase difference of 360/K degrees.

It should be noted that when K is equal to 1, one phase of the non-faulty bridge arm in the high-frequency bridge arm module 11 and the power-frequency bridge arm 12 form a rectifying full bridge, and can still convert the alternating current into the direct current to supply power to the power battery.

In the embodiment, the non-fault bridge arms with more than two phases are controlled to carry out power by adopting the staggered control method, so that the current ripple generated when the PFC module works can be effectively reduced, the probability of damaging electronic components comprising 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:

the first phase bridge arm 111 and the power frequency bridge arm 12 are independently conducted, after the preset time is reached, the voltage at two ends of the capacitor C1 is detected, and when the voltage value does not reach the voltage at two ends of the capacitor C1 when the first phase bridge arm 111 is not in fault, the fault of the first phase bridge arm 111 is judged and recorded; and if the voltage of the two ends of the capacitor C1 when the first phase bridge arm 111 is not in fault is reached, judging that the first phase bridge arm 111 is not in fault and recording the fault. 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 111 is not in fault, judging that the first phase bridge arm 111 is not in fault and recording; when the current does not reach the current of the power switch in the on state when the first phase bridge arm 111 is not in fault, the first phase bridge arm 111 is judged to be in fault and recorded.

It should be noted that turning on first phase leg 111 may include two ways: as shown in fig. 6, one of them is to turn on the first power switch Q1, turn off the second power switch Q2, turn off the seventh power switch Q7 and turn on the eighth power switch Q8 to realize energy storage; as shown in fig. 7, the second is to turn off the first power switch Q1, turn on the second power switch Q2, turn on the seventh power switch Q7, and turn off the eighth power switch Q8, at this time, the voltage across the capacitor C1 is detected.

The current flow when the second phase arm 112 is detected is shown in fig. 8 and 9, and the current flow when the third phase arm 113 is detected is shown in fig. 10 and 11. The method for detecting whether the first phase bridge arm 111, the second phase bridge arm 112 and the third phase bridge arm 113 have faults is similar, and is not described herein again.

In the present embodiment, the fault processing method can also be applied to a circuit topology shown in fig. 12, in which ac power can be output or input from the ac port 21 and dc power can be output or input from the power battery 22.

In the first embodiment of the present application, whether a fault circuit can be continuously charged can be determined, and the fault circuit in the fault bridge arm in the high-frequency bridge arm module 11 can be located, which is helpful for implementing accurate maintenance on the fault bridge arm, and reduces the problem of resource waste caused by damage of the high-frequency bridge arm module 11.

A second embodiment of the present application provides a fault handling system, which is applied to a circuit including a PFC module, as shown in fig. 1, where the PFC module includes a high-frequency bridge arm module 11 and a power-frequency bridge arm 12, the high-frequency bridge arm module 11 includes at least a three-phase bridge arm, and a detailed structure of the PFC 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 fault bridge arm positioning module is used for controlling at least one phase bridge arm of the high-frequency bridge arm module 11 and the power-frequency bridge arm 12 to enter a working state if the charging fault is a sustainable charging fault, acquiring a second power parameter of the output end of the PFC module in the current working state, and analyzing the second power parameter to determine a fault bridge arm of the high-frequency bridge arm module 11; and

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 the at least two phase of bridge arms and the power frequency bridge arm 12 to enter a working state, acquiring a third power parameter of the output end of the PFC 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 bridge arm is the third preset threshold, judging that one phase of bridge arm is a fault bridge arm; and if the current is not the third preset threshold, judging that the bridge arm of one phase is not the 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 high-frequency bridge arm module 11.

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 the non-fault bridge arm and the power frequency bridge arm 12 in the high-frequency bridge arm module 11 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 high-frequency bridge arm module 11 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 from 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.

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 Direct RAM (RDRAM), direct 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 processing method is applied to a circuit containing a PFC module, wherein the PFC module comprises a high-frequency bridge arm module and a power-frequency bridge arm, and the high-frequency bridge arm module comprises at least a three-phase bridge arm, and is characterized by comprising the following steps:

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

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

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

2. The fault handling 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 phases of the bridge arm of the high frequency bridge arm module and the power frequency bridge arm enter an operating state simultaneously;

the step of analyzing the second power parameter to determine a faulty bridge arm of the high-frequency bridge arm module includes:

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 the at least two phase 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 the at least two phase bridge arms.

4. The fault handling method according to claim 3, wherein after the step of determining that the at least two-phase leg has the faulty leg, the method comprises:

and controlling at least one phase of the at least two phase of bridge arms and the power frequency bridge arm to enter a working state, acquiring a third power parameter of the output end of the PFC 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.

5. The fault handling method according to claim 1, wherein a phase bridge arm of the high-frequency bridge arm module and the power-frequency bridge arm simultaneously enter an operating state;

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 fault handling method of claim 1, wherein after the step of analyzing the second power parameter to determine the faulty leg of the high frequency leg module, further comprising:

7. The fault handling method of claim 1, wherein after the step of analyzing the second power parameter to determine the faulty leg of the high frequency leg module, further comprising:

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 fault bridge arms in the high-frequency bridge arm 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 and the power frequency bridge arm in the high-frequency bridge arm module to enter a working state so as to continuously execute the charging operation.

8. The fault handling method according to claim 7, wherein a total number M of bridge arms in the high-frequency bridge arm 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 larger 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 by phases of 360/K degrees.

9. A fault handling system, comprising:

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

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

10. 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 8.