CN111337815A - Electric automobile, vehicle-mounted charger and fault detection method and device thereof - Google Patents
Electric automobile, vehicle-mounted charger and fault detection method and device thereof Download PDFInfo
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- CN111337815A CN111337815A CN201811556954.5A CN201811556954A CN111337815A CN 111337815 A CN111337815 A CN 111337815A CN 201811556954 A CN201811556954 A CN 201811556954A CN 111337815 A CN111337815 A CN 111337815A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an electric automobile, a vehicle-mounted charger and a fault detection method and device thereof, wherein the method comprises the following steps: acquiring direct-current bus voltage when each phase of a Power Factor Correction (PFC) circuit is independently conducted and current when a corresponding staggered phase of the PFC circuit works; judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than a preset current threshold value; and if the voltage of the direct current bus meets a preset condition or the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value, judging that the PFC circuit has a conducting phase fault. According to the fault detection method of the vehicle-mounted charger, after some phases in the PFC circuit are determined to be broken, other phases which are not broken can be controlled to work, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to an electric automobile, a vehicle-mounted charger and a fault detection method and device thereof.
Background
With the development of electric vehicle commercialization, an on-board charger on an electric vehicle has become one of important parts on the electric vehicle. At present, the characteristics of the Power Factor (PF) and the THD (total harmonic Distortion) of the vehicle charger also become important performance indexes for measuring the performance of the vehicle charger.
In the related art, Power Factor Correction is performed by using a polyphase interleaved PFC (Power Factor Correction) on the ac side.
However, in the whole charging process, the first phase to the fourth phase of the PFC circuit are switched on and off at 90 degrees in a fixed and staggered manner, and if one phase fails, the PFC circuit cannot continue to operate, so that the efficiency is greatly reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a method for detecting a fault of a vehicle-mounted charger, which can control other phases that do not have faults to work after confirming that some phases in a PFC circuit have faults and are damaged, so as to flexibly control different staggered phases of the PFC circuit to work to implement rectification, thereby avoiding the occurrence of a situation that a certain phase in the PFC circuit cannot work due to the occurrence of the certain phase, effectively improving the efficiency of the vehicle-mounted charger, and improving the performance of the vehicle-mounted charger.
A second object of the present invention is to provide a failure detection device for an in-vehicle charger.
A third object of the present invention is to provide an in-vehicle charger.
The fourth purpose of the invention is to provide an electric automobile.
A fifth object of the invention is to propose an electronic device.
A sixth object of the invention is to propose a non-transitory computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for detecting a fault of an onboard charger, including the following steps: acquiring direct-current bus voltage when each phase of a Power Factor Correction (PFC) circuit is independently conducted and current when the PFC circuit works corresponding to a staggered phase; judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value; and if the voltage of the direct current bus meets a preset condition, or the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value, judging that the PFC circuit has a conducting phase fault.
In addition, the fault detection method of the vehicle-mounted charger according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: if the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the PFC circuit to stop working; if three phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling one phase which does not have faults in the PFC circuit to work; if two phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the two phases which do not have faults in the PFC circuit to work in a staggered mode by 180 degrees; and if one of the 1 st phase to the 4 th phase in the PFC circuit has a fault, controlling the three phases which do not have the fault in the PFC circuit to work in a staggered mode by 120 degrees.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: if the working phase number of the PFC circuit is one phase, setting the current allowable charging power of the vehicle-mounted charger to be less than or equal to a first preset threshold value when the vehicle-mounted charger works; if the number of the working phases of the PFC circuit is two, setting the current allowable charging power to be less than or equal to a second preset threshold value when the vehicle-mounted charger works; and if the working phase number of the PFC circuit is three phases, setting the current allowable charging power to be less than or equal to a third preset threshold value when the vehicle-mounted charger works.
According to an embodiment of the present invention, the first preset threshold is one fourth of the maximum charging power of the vehicle-mounted charger; the second preset threshold is one half of the maximum charging power of the vehicle-mounted charger; the third preset threshold is three-quarters of the maximum charging power of the vehicle-mounted charger.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: when the 1 st phase of the PFC circuit has a fault, recording the 1 st phase fault of the PFC circuit; when the phase 2 of the PFC circuit has a fault, recording the phase 2 fault of the PFC circuit; when the 3 rd phase of the PFC circuit fails, recording the 3 rd phase failure of the PFC circuit; when the 4 th phase of the PFC circuit fails, recording the 4 th phase failure of the PFC circuit.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: and if the number of the working phases of the PFC circuit is four, controlling the phases from 1 st to 4 th of the PFC circuit to work in a staggered way by 90 degrees.
According to the fault detection method of the vehicle-mounted charger, provided by the embodiment of the invention, the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current of the PFC circuit corresponding to the staggered phase during working can be obtained, whether the direct-current bus voltage is greater than a preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than a preset current threshold value is judged, and the conduction phase fault of the PFC circuit is judged when the direct-current bus voltage meets a preset condition or the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value. Therefore, after confirming that some phases in the PFC circuit are broken down and damaged, the rectification can be realized by flexibly controlling the work of other phases which are not broken down, so that the condition that the phases in the PFC circuit cannot work due to the appearance of a certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
In order to achieve the above object, a second aspect of the present invention provides a fault detection device for an in-vehicle charger, including: the acquisition module is used for acquiring the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current when the PFC circuit works corresponding to the staggered phase; the judging module is used for judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value; and the judging module is used for judging the conducting phase fault of the PFC circuit when the voltage of the direct current bus meets a preset condition or the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value.
In addition, the fault detection device of the vehicle-mounted charger according to the above-described embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the first control module is used for controlling the PFC circuit to stop working when the 1 st phase to the 4 th phase in the PFC circuit have faults; the second control module is used for controlling one phase which does not have faults in the PFC circuit to work when three phases from the 1 st phase to the 4 th phase in the PFC circuit have faults; the third control module is used for controlling two phases which do not have faults in the PFC circuit to work in a staggered mode by 180 degrees when two phases from the 1 st phase to the 4 th phase in the PFC circuit have faults; and the fourth control module is used for controlling three phases which do not have faults in the PFC circuit to work in a staggered mode by 120 degrees when one phase from the 1 st phase to the 4 th phase in the PFC circuit has faults.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the first setting module is used for setting the current allowable charging power of the vehicle-mounted charger to be less than or equal to a first preset threshold when the working phase number of the PFC circuit is one phase and the vehicle-mounted charger works; the second setting module is used for setting the current allowable charging power to be smaller than or equal to a second preset threshold when the working phase number of the PFC circuit is two phases and the vehicle-mounted charger works; and the third setting module is used for setting the current allowable charging power to be less than or equal to a third preset threshold when the working phase number of the PFC circuit is three and the vehicle-mounted charger works.
According to an embodiment of the present invention, the first preset threshold is one fourth of the maximum charging power of the vehicle-mounted charger; the second preset threshold is one half of the maximum charging power of the vehicle-mounted charger; the third preset threshold is three-quarters of the maximum charging power of the vehicle-mounted charger.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the first recording module is used for recording the 1 st phase fault of the PFC circuit when the 1 st phase of the PFC circuit has the fault; the second recording module is used for recording the 2 nd phase fault of the PFC circuit when the 2 nd phase of the PFC circuit has the fault; the third recording module is used for recording the 3 rd phase fault of the PFC circuit when the 3 rd phase of the PFC circuit has the fault; and the fourth recording module is used for recording the 4 th phase fault of the PFC circuit when the 4 th phase of the PFC circuit has the fault.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: and the fourth control module is used for controlling the 1 st phase to the 4 th phase of the PFC circuit to work in a 90-degree staggered mode when the number of the working phases of the PFC circuit is four.
According to the fault detection device of the vehicle-mounted charger, the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current of the PFC circuit corresponding to the staggered phase during working are obtained through the obtaining module, whether the direct-current bus voltage is larger than the preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value is judged through the judging module, and the conducting phase fault of the PFC circuit is judged through the judging module when the direct-current bus voltage meets the preset condition or the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value. Therefore, after some phases in the PFC circuit are determined to be broken down and damaged, the other phases which are not broken down can be controlled to work, so that the rectification is realized by flexibly controlling the different staggered phases of the PFC circuit, the condition that the phases cannot work due to the fact that some phases in the PFC circuit appear is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
In order to achieve the above object, a third aspect of the present invention provides an in-vehicle charger including the failure detection device of the in-vehicle charger.
According to the vehicle-mounted charger provided by the embodiment of the invention, after some phases in the PFC circuit are determined to be failed and damaged, the other phases which are not failed can be controlled to work through the fault detection device of the vehicle-mounted charger, so that the different staggered phases of the PFC circuit can be flexibly controlled to work to realize rectification, the condition that the certain phase in the PFC circuit cannot work due to the occurrence of the certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
In order to achieve the above object, a fourth aspect of the present invention provides an electric vehicle, which includes the above vehicle-mounted charger.
According to the electric automobile provided by the embodiment of the invention, after some phases in the PFC circuit are determined to be failed and damaged, other phases which are not failed can be controlled to work through the vehicle-mounted charger, so that the different staggered phases of the PFC circuit can be flexibly controlled to realize rectification, the situation that the certain phase in the PFC circuit cannot work due to the occurrence of the certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
In order to achieve the above object, a fifth embodiment of the present invention provides an electronic device, which includes a processor memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method for detecting a fault of an onboard charger is implemented.
In order to achieve the above object, a sixth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the method for detecting a fault of an in-vehicle charger described above.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a fault detection method of an in-vehicle charger according to an embodiment of the present invention;
FIG. 2 is a circuit schematic of an on-board charger according to one embodiment of the present invention;
fig. 3 is a flowchart of a fault detection method of an in-vehicle charger according to one embodiment of the present invention;
FIG. 4 is a flow chart of a method of fault detection for an on-board charger according to an embodiment of the invention;
fig. 5 is a block schematic diagram of a fault detection device of an in-vehicle charger according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electric vehicle, a vehicle-mounted charger, and a fault detection method and device thereof according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a fault detection method of an in-vehicle charger according to an embodiment of the present invention. As an example, as shown in fig. 2, the vehicle-mounted charger may include a PFC circuit 101, a rectifier circuit 102, and an inverter circuit 103, wherein an input terminal of the rectifier circuit 102 may be connected to an external alternating current power source AC, and the rectifier circuit 102 is configured to rectify an alternating current provided by the external alternating current power source AC to output a first direct current; an input terminal of the PFC circuit 101 is connected to an output terminal of the rectifier circuit 102, the PFC circuit 101 having 4 phases, wherein L1, Q1, and D1 are configured as a 1 st phase of the PFC circuit 101, L2, Q2, and D2 are configured as a 2 nd phase of the PFC circuit 101, L3, Q3, and D3 are configured as a 3 rd phase of the PFC circuit 101, and L4, Q4, and D4 are configured as a 4 th phase of the PFC circuit 101, the PFC circuit 101 being operable to power correct a first direct current to obtain a first direct current bus voltage V1; an input end of the inverter circuit 103 is connected to an output end of the PFC circuit 101, and the inverter circuit 103 may invert the voltage V1 to the first dc bus to output a first ac power.
As shown in fig. 2, the vehicle-mounted charger may further include a transformer 104 and a converting circuit 105, a primary of the transformer 104 is connected to an output terminal of the inverter circuit 103, a secondary of the transformer 104 is connected to an input terminal of the converting circuit 105, the transformer 104 is configured to output a second alternating current according to the first alternating current, an output terminal of the converting circuit 105 is connected to a power battery 200 of the electric vehicle, the converting circuit 105 is configured to rectify the second alternating current to obtain a second direct current bus voltage V2, and the second direct current bus voltage V2 is configured to be provided to the power battery 200 to charge the power battery 200.
Further, as shown in fig. 2, the vehicle-mounted charger may further include a first capacitor C1, a second capacitor C2, and a third capacitor C3, wherein the first capacitor C1 is connected in parallel to the input terminal of the rectifying circuit 102, the second capacitor C2 is connected in parallel to the input terminal of the inverter circuit 103, and the third capacitor C3 is connected in parallel to the output terminal of the converting circuit 105.
As an example, the rectifying circuit 102 may be a rectifying bridge composed of 4 diodes, the inverter circuit 103 may be an inverter bridge composed of 4 IGBT transistors, i.e., T1, T2, T3, and T4, and the inverter circuit 105 may be a rectifying bridge composed of 4 IGBT transistors, i.e., T5, T6, T7, and T8.
Specifically, as shown in fig. 1, the fault detection method of the vehicle-mounted charger includes the following steps:
and S1, acquiring the direct current bus voltage when each phase of the PFC circuit is independently conducted and the current when the PFC circuit works corresponding to the staggered phase. As shown in fig. 2, the dc bus voltage may be the first dc bus voltage V1.
Specifically, as shown in fig. 2, when acquiring the dc bus voltage and the current of the PFC circuit during the operation corresponding to the alternate phase, the first phase Q1 of the PFC circuit may be turned on, the second phase Q2 of the PFC circuit, the third phase Q3 of the PFC circuit, and the fourth phase Q4 of the PFC circuit may be turned off, and the dc bus voltage and the current of the PFC circuit during the operation corresponding to the alternate phase may be acquired; secondly, turning on a second phase Q2 of the PFC circuit, turning off a first phase Q1 of the PFC circuit, a third phase Q3 of the PFC circuit and a fourth phase Q4 of the PFC circuit, and acquiring the voltage of a direct-current bus and the current of the PFC circuit when the corresponding alternate phase works; thirdly, turning on a third phase Q3 of the PFC circuit, turning off a first phase Q1 of the PFC circuit, a second phase Q2 of the PFC circuit and a fourth phase Q4 of the PFC circuit, and acquiring the voltage of a direct-current bus and the current of the PFC circuit when the corresponding alternate phase works; and finally, turning on a fourth phase Q4 of the PFC circuit, turning off a first phase Q1 of the PFC circuit, a second phase Q2 of the PFC circuit and a third phase Q3 of the PFC circuit, and acquiring the voltage of the direct-current bus and the current of the PFC circuit when the corresponding alternate phase works. The obtaining of the dc bus voltage and the current of the PFC circuit during the operation corresponding to the alternate phase may be a measurement method in the related art, for example, the measurement method is directly obtained by software, and details are not described here in order to avoid redundancy.
And S2, judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than a preset current threshold value.
The preset voltage threshold and the preset current threshold can be obtained by a person skilled in the art through a lot of experiments, for example, the preset current threshold may be 1A.
Specifically, after the direct-current bus voltage and the current of the PFC circuit during the operation of the alternate phase are obtained, it may be determined whether the direct-current bus voltage is greater than a preset voltage threshold, or whether the current of the PFC circuit during the operation of the alternate phase is smaller than a preset current threshold, or simultaneously whether the direct-current bus voltage is greater than the preset voltage threshold, and whether the current of the PFC circuit during the operation of the alternate phase is smaller than the preset current threshold.
And S3, if the voltage of the direct current bus meets a preset condition, or the current of the PFC circuit when working corresponding to the staggered phase is smaller than a preset current threshold, judging that the PFC circuit has a conducting phase fault.
Specifically, if the voltage of the direct current bus is judged to reach the preset voltage threshold, or the current of the PFC circuit when working corresponding to the staggered phase is smaller than the preset current threshold, if the current is smaller than 1A, it is judged that the PFC circuit has a conducting phase fault.
In one example, when the first phase Q1 of the PFC circuit is turned on separately, and the second phase Q2 of the PFC circuit, the third phase Q3 of the PFC circuit, and the fourth phase Q4 of the PFC circuit are all turned off, if the dc bus voltage satisfies a preset condition, or the current of the PFC circuit operating corresponding to the alternate phase is less than a preset current threshold, it is determined that the first phase Q1 of the PFC circuit has a fault;
in another example, when the second phase Q2 of the PFC circuit is turned on alone and the first phase Q3 of the PFC circuit, the third phase Q3 of the PFC circuit, and the fourth phase Q4 of the PFC circuit are all turned off, if the dc bus voltage satisfies a preset condition or the current of the PFC circuit when operating corresponding to the alternate phase is less than a preset current threshold, it is determined that the second phase Q2 of the PFC circuit has a fault.
Note that, the determination method of turning on the third phase Q3 of the PFC circuit alone, turning on the fourth phase Q4 of the PFC circuit alone, turning on the first phase Q1 of the PFC circuit alone, or turning on the second phase Q2 of the PFC circuit alone is the same, and will not be described in detail here in order to reduce redundancy.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: if the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the PFC circuit to stop working; if three phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the one phase which does not have faults in the PFC circuit to work; if two phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the two phases which do not have faults in the PFC circuit to work in a staggered mode by 180 degrees; and if one of the phases from the 1 st phase to the 4 th phase in the PFC circuit is failed, controlling the three phases which are not failed in the PFC circuit to work by staggering 120 degrees.
Specifically, there are 4 cases where the 1 st phase to the 4 th phase in the PFC circuit fail, such as failure of all four phases in the PFC circuit, failure of three phases in the PFC circuit, failure of two phases in the PFC circuit, and failure of only one phase in the PFC circuit.
Specifically, when it is determined that all of the phases 1 to 4 in the PFC circuit have a fault, it indicates that the vehicle-mounted charger cannot normally output, and it is necessary to control the PFC circuit to stop operating.
If three phases of the 1 st phase to the 4 th phase in the PFC circuit have faults, such as the 2 nd phase to the 4 th phase in the PFC circuit, the 1 st phase of the PFC circuit can be controlled to work; if the 1 st phase, the 3 rd phase and the 4 th phase in the PFC circuit have faults, the 2 nd phase of the PFC circuit can be controlled to work; if the 1 st phase, the 2 nd phase and the 4 th phase in the PFC circuit have faults, the 3 rd phase of the PFC circuit can be controlled to work; if the 1 st phase to the 3 rd phase in the PFC circuit are failed, the 4 th operation of the PFC circuit can be controlled.
If two phases of the 1 st phase to the 4 th phase in the PFC circuit are failed, such as the 1 st phase and the 2 nd phase in the PFC circuit, the 3 rd phase and the 4 th phase of the PFC circuit can be controlled to work, and the 3 rd phase and the 4 th phase of the PFC circuit are staggered by 180 degrees, such as the driving signal of the 4 th phase of the PFC circuit lags behind the driving signal of the 3 rd phase of the PFC circuit by 180 degrees; if the 3 rd phase and the 4 th phase in the PFC circuit are failed, the 1 st phase and the 1 st phase of the PFC circuit can be controlled to work, and the 1 st phase and the 2 nd phase of the PFC circuit work by staggering 180 degrees. That is, when two phases from phase 1 to phase 4 in the PFC circuit fail, the remaining two phases operate by 180 ° in a staggered manner, and details are not repeated herein to avoid redundancy.
If one of the phases from the 1 st phase to the 4 th phase in the PFC circuit is failed, such as the 1 st phase in the PFC circuit is failed, the phases from the 2 nd phase to the 4 th phase of the PFC circuit can be controlled to work, and the phases from the 2 nd phase to the 4 th phase of the PFC circuit are staggered by 120 degrees, such as the driving signal of the 3 rd phase of the PFC circuit lags behind the driving signal of the 2 nd phase of the PFC circuit by 120 degrees, and the driving signal of the 4 th phase of the PFC circuit lags behind the driving signal of the 3 rd phase of the PFC circuit by 120 degrees. That is, when one of the phases 1 to 4 in the PFC circuit fails, the remaining three phases operate at 120 ° in a staggered manner, and details thereof are not repeated herein to avoid redundancy.
Therefore, after some phases in the PFC circuit are determined to be failed and damaged, the PFC circuit can be in a rectification state by controlling the operation of other phases which are not failed, so as to maintain the stability of the first dc bus V1, as shown in fig. 2, the IGBT tubes, i.e., T1, T2, T3 and T4, in the inverter circuit, and the 4 IGBT tubes, i.e., T5, T6, T7 and T8, in the inverter circuit are controlled to be turned on and off, so as to convert the first dc bus V1 into the second dc bus voltage V2, thereby charging the power battery, avoiding the occurrence of a situation that a certain phase in the PFC circuit cannot operate due to the occurrence of the certain phase, effectively improving the efficiency of the vehicle-mounted charger, and improving the performance of the vehicle-mounted charger.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: if the working phase number of the PFC circuit is one phase, setting the current allowable charging power of the vehicle-mounted charger to be less than or equal to a first preset threshold value; if the number of working phases of the PFC circuit is two, setting the current allowable charging power to be less than or equal to a second preset threshold; and if the number of the working phases of the PFC circuit is three, setting the current allowable charging power to be less than or equal to a third preset threshold value.
According to one embodiment of the invention, the first preset threshold is one fourth of the maximum charging power of the vehicle-mounted charger; the second preset threshold is one half of the maximum charging power of the vehicle-mounted charger; the third preset threshold is three-quarters of the maximum charging power of the vehicle-mounted charger.
Specifically, if the number of working phases of the PFC circuit is one, it indicates that three phases in the PFC circuit have a fault, and the current allowed charging power of the vehicle-mounted charger may be smaller than or equal to a first preset threshold, for example, the first preset threshold may be 1/4 of the maximum output power of the vehicle-mounted charger; if the number of the working phases of the PFC circuit is two, it indicates that two phases in the PFC circuit have a fault, and at this time, the current allowed charging power of the vehicle-mounted charger may be less than or equal to a second preset threshold, for example, the second preset threshold may be 1/2 of the maximum output power of the vehicle-mounted charger; if the number of the working phases of the PFC circuit is three, which indicates that one phase of the PFC circuit has a fault, at this time, the current allowed charging power of the vehicle-mounted charger may be less than or equal to a third preset threshold, for example, the first preset threshold may be 3/4 of the maximum output power of the vehicle-mounted charger. It should be noted that the maximum output power of the vehicle-mounted charger is the maximum charging power allowed when the vehicle-mounted charger is not in fault, and the first preset threshold, the second preset threshold, and the third preset threshold may also be set according to an actual situation, which is not specifically limited herein.
For example, as shown in fig. 3, in an embodiment of the present invention, the method for detecting a fault of an onboard charger includes the following steps:
step S301, confirming that the PFC circuit has a failure.
Step S302, determining whether the 1 st phase to the 4 th phase in the PFC circuit all have faults, if yes, executing step S303, otherwise, executing step S304.
In step S303, the in-vehicle charger stops operating.
Step S304, judging whether three phases in the PFC circuit have faults, if so, executing step S305, otherwise, executing step S306.
In step S305, the PFC circuit operates alone without a fault, and the output power is set to 1/4 equal to or less than the maximum output power.
Step S306, determining whether two phases in the PFC circuit have faults, if yes, executing step S307, otherwise, executing step S308.
In step S307, two phases of the PFC circuit that do not have a fault operate at 180 ° in a staggered manner, and the output power is set to 1/2 which is equal to or less than the maximum output power.
Step S308, determining whether only one phase in the PFC circuit fails, if so, executing step S309.
In step S309, the three phases of the PFC circuit that do not have a fault operate at 120 ° in a staggered manner, and the output power is set to 3/4 which is equal to or less than the maximum output power.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: when the 1 st phase of the PFC circuit has a fault, recording the 1 st phase fault of the PFC circuit; when the phase 2 of the PFC circuit has a fault, recording the phase 2 fault of the PFC circuit; when the 3 rd phase of the PFC circuit has a fault, recording the 3 rd phase fault of the PFC circuit; and when the 4 th phase of the PFC circuit fails, recording the 4 th phase failure of the PFC circuit.
It can be understood that, after a certain phase of the PFC circuit fails, the failure information of the phase can be recorded so as to prompt the relevant technicians for timely maintenance. After the maintenance process, the failure information is deleted. Therefore, the fault information can be recorded, the phase with the fault recorded can be not detected during fault detection, the fault is directly determined, the step of acquiring the voltage of the direct-current bus or the current during the working of the staggered phase can be reduced, the fault detection time can be saved, and the efficiency can be improved.
For example, when the 1 st phase of the PFC circuit fails, recording the 1 st phase failure of the PFC circuit; recording faults of the 1 st phase and the 2 nd phase of the PFC circuit when the 1 st phase and the 2 nd phase of the PFC circuit have faults; recording faults of the 1 st phase, the 2 nd phase and the 3 rd phase of the PFC circuit when the 1 st phase, the 2 nd phase and the 3 rd phase of the PFC circuit have faults; when the 1 st phase to the 4 th phase of the PFC circuit are failed, recording the 1 st phase to the 4 th phase of the PFC circuit. That is to say, when a certain phase of PFC circuit breaks down, all can be noted for the maintenance in later stage effectively improves on-vehicle charger's performance.
According to an embodiment of the present invention, the method for detecting a fault of the vehicle-mounted charger further includes: and if the number of the working phases of the PFC circuit is four, controlling the phases 1 to 4 of the PFC circuit to work by staggering 90 degrees.
Specifically, if the number of the working phases of the PFC circuit is four, it indicates that no failure occurs in any of the phases 1 to 4 in the PFC circuit, and the phases 1 to 4 of the PFC circuit may be controlled to operate by being staggered by 90 °. For example, the driving signal of the 2 nd phase of the PFC circuit lags behind the driving signal of the 1 st phase of the PFC circuit by 90 °, the driving signal of the 3 rd phase of the PFC circuit lags behind the driving signal of the 2 nd phase of the PFC circuit by 90 °, and the driving signal of the 4 th phase of the PFC circuit lags behind the driving signal of the 3 rd phase of the PFC circuit by 90 °.
For example, as shown in fig. 4, in an embodiment of the invention, the method for detecting the fault of the vehicle-mounted charger includes the following steps:
step S401, the vehicle-mounted charger fails, charging cannot be normally output, and fault detection of the vehicle-mounted charger is carried out.
Step S402, independently conducting the phase 1 of the PFC circuit, detecting the direct current bus voltage and the current of the PFC circuit corresponding to the staggered phase in work after 10S, judging whether the direct current bus voltage meets a preset condition or whether the current of the PFC circuit corresponding to the staggered phase in work is smaller than a preset current threshold, if so, executing step S403, otherwise, executing step S404.
In step S403, a phase 1 fault of the PFC circuit is recorded.
Step S404, independently conducting the phase 2 of the PFC circuit, detecting the direct current bus voltage and the current of the PFC circuit corresponding to the staggered phase in operation after 10S, and judging whether the direct current bus voltage meets a preset condition or whether the current of the PFC circuit corresponding to the staggered phase in operation is smaller than a preset current threshold, if so, executing step S405, otherwise, executing step S406.
Step S405, recording phase 2 faults of the PFC circuit.
Step S406, independently conducting the 3 rd phase of the PFC circuit, detecting the direct-current bus voltage and the current of the PFC circuit corresponding to the staggered phase in operation after 10S, and judging whether the direct-current bus voltage meets a preset condition or whether the current of the PFC circuit corresponding to the staggered phase in operation is smaller than a preset current threshold, if so, executing step S407, otherwise, executing step S408.
Step S407, recording a phase 3 fault of the PFC circuit.
Step S408, independently conducting the 4 th phase of the PFC circuit, detecting the direct-current bus voltage and the current of the PFC circuit corresponding to the staggered phase after 10S, judging whether the direct-current bus voltage meets a preset condition or whether the current of the PFC circuit corresponding to the staggered phase is smaller than a preset current threshold value, and if so, executing step S409.
And step S409, recording the 4 th phase fault of the PFC circuit.
According to the fault detection method of the vehicle-mounted charger provided by the embodiment of the invention, the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current of the PFC circuit corresponding to the staggered phase during working can be obtained, whether the direct-current bus voltage is greater than the preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value is judged, and the conduction phase fault of the PFC circuit is judged when the direct-current bus voltage meets the preset condition or the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value. Therefore, after confirming that some phases in the PFC circuit are broken down and damaged, the rectification can be realized by flexibly controlling the work of other phases which are not broken down, so that the condition that the phases in the PFC circuit cannot work due to the appearance of a certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
Fig. 5 is a block diagram schematically illustrating a fault detection apparatus of an in-vehicle charger according to an embodiment of the present invention. As shown in fig. 5, the failure detection device of the in-vehicle charger includes: the device comprises an acquisition module 10, a judgment module 20 and a judgment module 30.
The obtaining module 100 is configured to obtain a dc bus voltage when each phase of the PFC circuit is separately turned on and a current when the PFC circuit operates corresponding to the alternate phase. The determining module 200 is configured to determine whether the dc bus voltage is greater than a preset voltage threshold, and/or whether the current of the PFC circuit during the operation corresponding to the staggered phase is less than a preset current threshold. The determining module 300 is configured to determine a conducting phase fault of the PFC circuit when the dc bus voltage meets a preset condition, or when the current of the PFC circuit during working corresponding to the staggered phase is smaller than a preset current threshold.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the device comprises a first control module, a second control module, a third control module and a fourth control module. The first control module is used for controlling the PFC circuit to stop working when the 1 st phase to the 4 th phase in the PFC circuit are all in fault. The second control module is used for controlling the operation of one phase which does not have faults in the PFC circuit when three phases from the 1 st phase to the 4 th phase in the PFC circuit have faults. The third control module is used for controlling two phases which do not have faults in the PFC circuit to work in a staggered mode by 180 degrees when two phases from the 1 st phase to the 4 th phase in the PFC circuit have faults. The fourth control module is used for controlling three phases which do not have faults in the PFC circuit to work in a staggered mode by 120 degrees when one phase from the 1 st phase to the 4 th phase in the PFC circuit has faults.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the device comprises a first setting module, a second setting module and a third setting module. The first setting module is used for setting the current allowable charging power of the vehicle-mounted charger to be less than or equal to a first preset threshold when the working phase number of the PFC circuit is one phase and the vehicle-mounted charger works. The second setting module is used for setting the current allowable charging power to be smaller than or equal to a second preset threshold when the working phase number of the PFC circuit is two phases and the vehicle-mounted charger works. The third setting module is used for setting the current allowable charging power to be less than or equal to a third preset threshold when the working phase number of the PFC circuit is three phases and the vehicle-mounted charger works.
According to one embodiment of the invention, the first preset threshold is one fourth of the maximum charging power of the vehicle-mounted charger; the second preset threshold is one half of the maximum charging power of the vehicle-mounted charger; the third preset threshold is three-quarters of the maximum charging power of the vehicle-mounted charger.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: the device comprises a first recording module, a second recording module, a third recording module and a fourth recording module. The first recording module is used for recording the 1 st phase fault of the PFC circuit when the 1 st phase of the PFC circuit has the fault. And the second recording module is used for recording the phase 2 fault of the PFC circuit when the phase 2 of the PFC circuit has the fault. The third recording module is used for recording the 3 rd phase fault of the PFC circuit when the 3 rd phase of the PFC circuit has the fault. The fourth recording module is used for recording the 4 th phase fault of the PFC circuit when the 4 th phase of the PFC circuit has the fault.
According to an embodiment of the present invention, the fault detection apparatus of the vehicle-mounted charger further includes: and the fifth control module is used for controlling the phase 1 to the phase 4 of the PFC circuit to work in a staggered way by 90 degrees when the working phase number of the PFC circuit is four.
It should be noted that the foregoing explanation of the embodiment of the fault detection method for the vehicle-mounted charger is also applicable to the fault detection apparatus for the vehicle-mounted charger of the embodiment, and details are not repeated here.
According to the fault detection device of the vehicle-mounted charger, provided by the embodiment of the invention, the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current of the PFC circuit corresponding to the staggered phase during working are obtained through the obtaining module, whether the direct-current bus voltage is greater than the preset voltage threshold value and/or whether the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value is judged through the judging module, and the conducting phase fault of the PFC circuit is judged when the direct-current bus voltage meets the preset condition or the current of the PFC circuit corresponding to the staggered phase during working is smaller than the preset current threshold value through the judging module. Therefore, after some phases in the PFC circuit are determined to be broken down and damaged, the other phases which are not broken down can be controlled to work, so that the rectification is realized by flexibly controlling the different staggered phases of the PFC circuit, the condition that the phases cannot work due to the fact that some phases in the PFC circuit appear is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
The embodiment of the invention provides a vehicle-mounted charger which comprises the fault detection device of the vehicle-mounted charger.
According to the vehicle-mounted charger provided by the embodiment of the invention, through the fault detection device of the vehicle-mounted charger, after some phases in the PFC circuit are determined to be in fault and damaged, the other phases which do not have faults can be controlled to work, so that the different staggered phases of the PFC circuit are flexibly controlled to work to realize rectification, the condition that the certain phase in the PFC circuit cannot work due to the occurrence of the certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
The embodiment of the invention provides an electric automobile which comprises the vehicle-mounted charger.
According to the electric vehicle provided by the embodiment of the invention, after some phases in the PFC circuit are determined to be failed and damaged, other phases which are not failed can be controlled to work through the vehicle-mounted charger, so that the different staggered phases of the PFC circuit can be flexibly controlled to realize rectification, the situation that a certain phase in the PFC circuit cannot work due to the occurrence of the certain phase is avoided, the efficiency of the vehicle-mounted charger is effectively improved, and the performance of the vehicle-mounted charger is improved.
The embodiment of the invention provides electronic equipment which comprises a processor memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the fault detection method of the vehicle-mounted charger is realized.
An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for detecting a fault of an in-vehicle charger described above.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A fault detection method of a vehicle-mounted charger is characterized by comprising the following steps:
acquiring direct-current bus voltage when each phase of a Power Factor Correction (PFC) circuit is independently conducted and current when the PFC circuit works corresponding to a staggered phase;
judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value; and
and if the voltage of the direct current bus meets a preset condition, or the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value, judging that the PFC circuit has a conducting phase fault.
2. The method for detecting a malfunction of an in-vehicle charger according to claim 1, further comprising:
if the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the PFC circuit to stop working;
if three phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling one phase which does not have faults in the PFC circuit to work;
if two phases from the 1 st phase to the 4 th phase in the PFC circuit have faults, controlling the two phases which do not have faults in the PFC circuit to work in a staggered mode by 180 degrees;
and if one of the 1 st phase to the 4 th phase in the PFC circuit has a fault, controlling the three phases which do not have the fault in the PFC circuit to work in a staggered mode by 120 degrees.
3. The method for detecting a malfunction of an in-vehicle charger according to claim 2, further comprising:
if the working phase number of the PFC circuit is one phase, setting the current allowable charging power of the vehicle-mounted charger to be less than or equal to a first preset threshold value when the vehicle-mounted charger works;
if the number of the working phases of the PFC circuit is two, setting the current allowable charging power to be less than or equal to a second preset threshold value when the vehicle-mounted charger works;
and if the working phase number of the PFC circuit is three phases, setting the current allowable charging power to be less than or equal to a third preset threshold value when the vehicle-mounted charger works.
4. The method of detecting a malfunction of an in-vehicle charger according to claim 3,
the first preset threshold is one fourth of the maximum charging power of the vehicle-mounted charger;
the second preset threshold is one half of the maximum charging power of the vehicle-mounted charger;
the third preset threshold is three-quarters of the maximum charging power of the vehicle-mounted charger.
5. The method for detecting a malfunction of an in-vehicle charger according to claim 1, further comprising:
when the 1 st phase of the PFC circuit has a fault, recording the 1 st phase fault of the PFC circuit;
when the phase 2 of the PFC circuit has a fault, recording the phase 2 fault of the PFC circuit;
when the 3 rd phase of the PFC circuit fails, recording the 3 rd phase failure of the PFC circuit;
when the 4 th phase of the PFC circuit fails, recording the 4 th phase failure of the PFC circuit.
6. The method for detecting a malfunction of an in-vehicle charger according to claim 1 or 2, further comprising:
and if the number of the working phases of the PFC circuit is four, controlling the phases from 1 st to 4 th of the PFC circuit to work in a staggered way by 90 degrees.
7. A failure detection device of an on-vehicle charger, characterized by comprising:
the acquisition module is used for acquiring the direct-current bus voltage when each phase of the PFC circuit is independently conducted and the current when the PFC circuit works corresponding to the staggered phase;
the judging module is used for judging whether the voltage of the direct current bus is greater than a preset voltage threshold value and/or whether the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value; and
and the judging module is used for judging the conducting phase fault of the PFC circuit when the voltage of the direct current bus meets a preset condition or the current of the PFC circuit in the working process of the corresponding staggered phase is smaller than a preset current threshold value.
8. An in-vehicle charger characterized by comprising the failure detection device of the in-vehicle charger according to claim 7.
9. An electric vehicle characterized by comprising the in-vehicle charger according to claim 8.
10. An electronic device comprising a processor memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method of detecting a malfunction of an in-vehicle charger according to any one of claims 1 to 6 when executing the program.
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| CN201811556954.5A CN111337815A (en) | 2018-12-19 | 2018-12-19 | Electric automobile, vehicle-mounted charger and fault detection method and device thereof |
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| CN201811556954.5A CN111337815A (en) | 2018-12-19 | 2018-12-19 | Electric automobile, vehicle-mounted charger and fault detection method and device thereof |
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