CN114362333A

CN114362333A - Charging device and vehicle with same

Info

Publication number: CN114362333A
Application number: CN202011091548.3A
Authority: CN
Inventors: 刘伟冬; 王超; 王兴辉
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2022-04-15
Anticipated expiration: 2040-10-13

Abstract

The invention provides a charging device and a vehicle with the same, wherein the charging device comprises: the PFC circuit module at least comprises a three-phase bridge arm; the first end of the switch module is connected with the input end of the PFC circuit module, and the second end of the switch module is connected with the alternating current input end and used for controlling the on-state of a three-phase bridge arm in the PFC circuit module; the voltage detection module is connected with the output end of the PFC circuit module and used for detecting the bus voltage; and the control module is respectively connected with the PFC circuit module and the control end of the switch module and is used for controlling the switch state of the switch module according to the charging mode and carrying out fault detection and fault positioning on a three-phase bridge arm of the PFC circuit module according to the bus voltage. The charging device can realize a self-checking function before starting charging, and the problem that a certain phase bridge arm cannot work normally due to failure is avoided.

Description

Charging device and vehicle with same

Technical Field

The invention relates to the technical field of vehicles, in particular to a charging device and a vehicle with the same.

Background

With the commercialization progress of electric vehicles, a DC (Direct Current) converter and an OBC (ON-Board Controller) have become one of important parts of the electric vehicles.

In the related art, for any power level, when the vehicle-mounted charger starts charging, all the switch tubes are controlled to be turned on, for example, the switch tubes are controlled to be turned on and off at a fixed staggered angle of 180 degrees, so that all the switch tubes are in a working state to ensure normal output, and after the vehicle-mounted charger starts charging, whether a product is damaged is determined by judging whether energy is normally output, so that when one phase of the product is abnormal, for example, when hardware of some phases of the former-stage multi-phase staggered PFC has an unrecoverable fault, the whole charger cannot work normally.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a charging device, which can implement a self-checking function before starting charging, so as to avoid the problem that a certain phase bridge arm fails to work normally.

The second purpose of the invention is to provide a vehicle.

In order to solve the above problem, an embodiment of a first aspect of the present invention provides a charging device, including: the PFC circuit module is used for carrying out power factor correction on input alternating current and outputting a direct current signal after the power factor correction, and at least comprises a three-phase bridge arm; the first end of the switch module is connected with the input end of the PFC circuit module, and the second end of the switch module is connected with the alternating current input end and used for controlling the on-state of a three-phase bridge arm in the PFC circuit module; the voltage detection module is connected with the output end of the PFC circuit module and used for detecting the bus voltage; and the control module is respectively connected with the PFC circuit module and the control end of the switch module and is used for controlling the switch state of the switch module according to a charging mode and carrying out fault detection and fault positioning on a three-phase bridge arm of the PFC circuit module according to the bus voltage.

According to the charging device of the embodiment of the invention, the control module controls the switch state of the switch module based on the charging mode, so as to control the on-state of the three-phase bridge arm, so that the PFC circuit module rectifies the input alternating current to realize the purpose of charging, in addition, in the embodiment of the invention, the control module carries out fault detection and fault location on the three-phase bridge arm of the PFC circuit module according to the bus voltage, so that the self-detection of the charging device can be realized, therefore, before charging is started, when the hardware of some phases in the PFC circuit module is detected to have non-recoverable faults, the control module can control other phase bridge arms to work to realize charging by adjusting the switching state of the switching module, so as to avoid the problem that one phase bridge arm cannot work normally due to the fault, and the control module is used for positioning the fault position in the three-phase bridge arm, so that a user can conveniently process the fault phase bridge arm in time.

An embodiment of a second aspect of the invention provides a vehicle, including a power battery and a storage battery; in the charging device according to the above embodiment, the charging device is connected to the power battery and the storage battery respectively, and is configured to charge the power battery and the storage battery.

According to the vehicle provided by the embodiment of the invention, by adopting the charging device provided by the embodiment, the self-checking of the charging device can be realized while the power battery and the storage battery are charged, and the problem that the charging device cannot normally work due to the fault of a certain phase bridge arm is avoided.

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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a block diagram of a charging device according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram of a charging device according to one embodiment of the present invention;

fig. 3 is a schematic diagram of the switching state of a charging device after a second phase leg failure in accordance with one embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of a charging device according to another embodiment of the present invention;

fig. 5 is a schematic diagram of the switching state after a failure of the second phase leg of the charging device according to another embodiment of the invention;

fig. 6 is a block diagram of a vehicle according to an embodiment of the invention.

Reference numerals:

a vehicle 100;

a charging device 10; a power battery 30; a storage battery 40;

a PFC circuit module 1; a switch module 2; a voltage detection module 3; a control module 4; a first dc conversion module 5; a second direct current conversion module 6;

a first switching unit 21; a second switching unit 22; a third switching unit 23; a fourth switching unit 24; a fifth switching unit 25; a sixth switching unit 26; a seventh switching unit 27; a first phase arm 11; a second phase leg 12; a third phase arm 13; and a bus capacitor unit 14.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

In order to solve the above problem, an embodiment of a first aspect of the present invention provides a charging device, which can implement a self-checking function, and avoid a problem that a certain phase bridge arm fails to work normally due to a fault.

Fig. 1 is a block diagram of a charging device according to an embodiment of the present invention, and as shown in fig. 1, a charging device 10 according to an embodiment of the present invention includes a PFC circuit module 1, a switch module 2, a voltage detection module 3, and a control module 4.

In an embodiment, the PFC circuit module 1 is configured to perform power factor correction on an input alternating current and output a direct current electrical signal after the power factor correction, and the PFC circuit module 1 at least includes a three-phase bridge arm; the first end of the switch module 2 is connected with the input end of the PFC circuit module 1, and the second end of the switch module 2 is connected with an alternating current input end such as a power grid, and is used for controlling the on-state of a three-phase bridge arm in the PFC circuit module 1; the voltage detection module 3 is connected with the output end of the PFC circuit module 1 and used for detecting the bus voltage; the control module 4 is connected to the control terminals of the PFC circuit module 1 and the switch module 2, and is configured to control the switch state of the switch module 2 according to the charging mode, and perform fault detection and fault location on the three-phase bridge arm of the PFC circuit module 1 according to the bus voltage.

In the embodiment, based on the fact that the switch module 2 is respectively connected to the ac input terminal, such as the power grid, the PFC circuit module 1, the charging device 10 according to the embodiment of the present invention controls the on state of the three-phase bridge arm by controlling different switching modes of the switch module 2, so as to not only enable the PFC circuit module 1 to rectify the input ac to achieve the purpose of charging, but also enable the PFC circuit module 1 to self-check by switching the switching state of the switch module 2, specifically, by controlling different switching modes of the switch module 2 by the control module 4 to control the on or off of the three-phase bridge arm to match the three-phase charging mode or the single-phase charging mode, so as to achieve the rectification of the PFC circuit module 1 to perform charging, and before starting charging, by controlling different combination forms of the switch module 2 based on the control module 4 to control the on state of the three-phase bridge arm, and detecting the bus voltage by the voltage detection module 3, therefore, the control module 4 can detect a fault of each phase of bridge arm in the PFC circuit module 1 according to the bus voltage to realize self-checking of the charging device 10, so that when an unrecoverable fault of some phases of hardware in the PFC circuit module 1 is detected, the control module 4 can effectively identify and record the faulty phase of bridge arm, further can control the faulty phase of bridge arm to be disconnected by adjusting the switching state of the switch module 2, and can continue to complete charging by working through other non-faulty phase of bridge arms, thereby avoiding the problem that a certain phase of bridge arm cannot normally work due to a fault, and when a certain phase of bridge arm fails, the control module 4 can effectively identify and record the faulty phase of bridge arm to realize fault location, so that a user can conveniently determine a fault position to process the fault position.

According to the charging device 10 of the embodiment of the present invention, the control module 4 controls the on-off state of the switch module 2 based on the charging mode to control the on-state of the three-phase bridge arms, so that the PFC circuit module 1 rectifies the input ac power to achieve the purpose of charging, and in the embodiment of the present invention, the control module 4 performs fault detection on each phase of the bridge arms in the PFC circuit module 1 according to the bus voltage to achieve self-detection on the charging device 10, so that before starting charging, when detecting that some phases of hardware in the PFC circuit module 1 have unrecoverable faults, the control module 4 can control other phase of bridge arms to work to achieve charging by adjusting the on-off state of the switch module 2, thereby avoiding the problem that some phase of bridge arms fail to work normally due to faults, and positioning the fault positions in the three-phase of bridge arms through the control module 4, and the user can conveniently process the fault phase bridge arm in time.

In some embodiments, as shown in fig. 2, the charging device 10 according to the embodiment of the present invention further includes a first dc conversion module 5, an input end of the first dc conversion module 5 is connected to an output end of the PFC circuit module 1, an output end of the first dc conversion module 5 is connected to the power battery 30, and is configured to convert a dc signal after power factor correction into a dc signal required by the power battery to charge the power battery 30, and the control module 4 is connected to a control end of the first dc conversion module 5 and is further configured to control the first dc conversion module 5 to start to discharge the bus voltage after performing fault detection and fault location on a three-phase bridge arm of the PFC circuit module 1.

In some embodiments, as shown in fig. 2, the switch module 2 of the embodiment of the present invention includes a first switch unit 21, a second switch unit 22, a third switch unit 23, and a fourth switch unit 24.

The first switch unit 21 includes a first stationary contact K2, a first idle contact K1, and a first switch S1, the first stationary contact K2 is connected to the first ac input end a, the first idle contact K1 is idle, a first end of the first switch S1 is connected to a first phase bridge arm in the three-phase bridge arm, a second end of the first switch S1 is selectively connected to the first stationary contact K2 or the first idle contact K1, and the first switch unit 21 is configured to control a connection state of the first phase bridge arm.

And the second switch unit 22 includes a second stationary contact K3, a third stationary contact K4, and a second switch S2, the second stationary contact K3 is connected to the second phase alternating current input terminal B, the third stationary contact K4 is connected to the first phase alternating current input terminal a, a first end of the second switch S2 is connected to the second phase bridge arm in the three-phase bridge arm, a second end of the second switch S2 is selectively connected to the second stationary contact K3 or the third stationary contact K4, and the second switch unit 22 is configured to control a connection state of the second phase bridge arm.

And the third switching unit 23 includes a fourth stationary contact K5, a fifth stationary contact K6 and a third switch S3, the fourth stationary contact K5 is connected to the third phase alternating current input terminal C, the fifth stationary contact K6 is connected to the first phase alternating current input terminal a, a first end of the third switch S3 is connected to the third phase bridge arm of the three phase bridge arms, a second end of the third switch S3 is selectively connected to the fourth stationary contact K5 or the fifth stationary contact K6, and the third switching unit 23 is configured to control a connection state of the third phase bridge arm.

And the fourth switch unit 24 includes a sixth stationary contact K7, a second idle contact K8 and a fourth switch S4, the sixth stationary contact K7 is connected to the neutral input terminal N, the second idle contact K8 is idle, a first end of the fourth switch S4 is connected to the charging circuit connection terminal of the PFC circuit module 1, a second end of the fourth switch S4 is selectively connected to the sixth stationary contact K7 or the second idle contact K8, and the fourth switch unit 24 is configured to control the on state of the single-phase charging circuit.

In some embodiments, as shown in fig. 2, the first phase bridge arm 11 of the embodiment of the present invention includes a first switching tube Q1 and a second switching tube Q2, a first end of the first switching tube Q1 is connected to a first input end of the first dc converting module 5, a second end of the first switching tube Q1 is connected to a first end of the second switching tube Q2, a control end of the first switching tube Q1 is connected to the control module 4, a second end of the second switching tube Q2 is connected to a second input end of the first dc converting module 5, a first node is located between the second end of the first switching tube Q1 and the first end of the second switching tube Q2, and the first node is connected to a first end of the first switch S1 through a first inductor L1.

And the second phase arm 12 comprises a third switch tube Q3 and a fourth switch tube Q4, a first end of the third switch tube Q3 is connected with a first input end of the first dc conversion module 5, a second end of the third switch tube Q3 is connected with a first end of the fourth switch tube Q4, a control end of the third switch tube Q3 is connected with the control module 4, a second end of the fourth switch tube Q4 is connected with a second input end of the first dc conversion module 5, a control end of the fourth switch tube Q4 is connected with the control module 4, a second node is arranged between the first end of the fourth switch tube Q4 and the second end of the third switch tube Q3, and the second node is connected with a first end of the second switch S2 through a second inductor L2.

And the third phase arm 13 includes a fifth switching tube Q5 and a sixth switching tube Q6, a first end of the fifth switching tube Q5 is connected to the first input end of the first dc conversion module 5, a second end of the fifth switching tube Q5 is connected to the first end of the sixth switching tube Q6, a control end of the fifth switching tube Q5 is connected to the control module 4, a second end of the sixth switching tube Q6 is connected to the second input end of the first dc conversion module 5, a control end of the sixth switching tube Q6 is connected to the control module 4, a third node is provided between the first end of the sixth switching tube Q6 and the second end of the fifth switching tube Q5, and the third node is connected to the first end of the third switch S3 through a third inductor L3.

And the PFC circuit module 1 further includes a bus capacitor unit 14, the bus capacitor unit 14 includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 is connected to a first end of the first switch tube Q1, a first end of the third switch tube Q3, and a first end of the fifth switch tube Q5, respectively, a second end of the first capacitor C1 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is connected to a second end of the second switch tube Q2, a second end of the fourth switch tube Q4, and a second end of the sixth switch tube Q6, respectively, a fourth node is provided between the second end of the first capacitor C1 and the first end of the second capacitor C2, and the fourth node is connected to a first end of the fourth switch S4. The PFC circuit module 1 further includes a first resistor R1, a first end of the first resistor R1 is connected to a first end of the first capacitor C1, and a second end of the first resistor R1 is connected to a second end of the second capacitor C2.

The following describes a process of the charging device implementing self-checking in different combinations of the switch modules when in the three-phase charging mode according to the embodiment of the present invention with reference to fig. 2.

In some embodiments, referring to fig. 2, when controlling the switching state of the switch module 2 according to the charging mode and performing fault detection and fault location on the three-phase arm of the PFC circuit module 1 according to the bus voltage, the control module 4 is specifically configured to, during the three-phase charging mode, control the second terminal of the fourth switch S4 to be connected to the sixth stationary contact K7, and control the second terminal of the first switch S1 to be connected to the first stationary contact K2, obtain the bus voltage at two ends of the bus capacitor unit 14, where the bus voltage is within the bus voltage threshold range, determine that the switching tube of the first-phase arm 11 is normal, or determine that the switching tube of the first-phase arm 11 has a fault when the bus voltage exceeds the bus voltage threshold range.

For example, as shown in fig. 2, when the three-phase charging mode is performed, the switch S4 is connected to the contact K7, and then the switch S1 is connected to the contact K2, if the switching tubes in the first-phase arm 11 are all normal, the first ac input end, i.e., the a ac voltage, is uncontrollably rectified through the first switching tube Q1 and the second switching tube Q2 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage across the bus capacitor unit 14 is detected through the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is indicated that the switching tubes in the first-phase arm 11 are normal, otherwise, the phase abnormality is recorded.

Or, referring to fig. 2, in the three-phase charging mode, controlling the second end of the fourth switch S4 to be connected to the sixth stationary contact K7, and controlling the second end of the second switch S2 to be connected to the second stationary contact K3, obtaining the bus voltage at two ends of the bus capacitor unit 14, where the bus voltage is within the bus voltage threshold range, determining that the switching tube of the second phase bridge arm 12 is normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the second phase bridge arm 12 fails.

For example, as shown in fig. 2, when the three-phase charging mode is performed, after the detection of the first phase arm 11 is completed, the second phase arm 12 is detected, specifically, the switch S4 is connected to the contact K7, then the switch S2 is connected to the contact K3, if the switching tubes in the second phase arm 12 are all normal, the second phase ac input end, that is, the B ac voltage, is uncontrollably rectified by the third switching tube Q3 and the fourth switching tube Q4 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage at the two ends of the bus capacitor unit 14 is detected by the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is determined that the switching tubes in the second phase arm 12 are normal, otherwise, the phase abnormality is recorded.

Or, referring to fig. 2, in the three-phase charging mode, controlling the second end of the fourth switch S4 to be connected to the sixth stationary contact K7, and controlling the second end of the third switch S3 to be connected to the fourth stationary contact K5, obtaining the bus voltage at two ends of the bus capacitor unit 14, where the bus voltage is within the bus voltage threshold range, determining that the switching tubes of the third phase bridge arm 13 are normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tubes of the third phase bridge arm 13 are failed.

For example, as shown in fig. 2, when the three-phase charging mode is performed, after the detection of the second phase arm 12 is completed, the third phase arm 13 is detected, specifically, the switch S4 is connected to the contact K7, then the switch S3 is connected to the contact K5, if the switching tubes in the third phase arm 13 are all normal, the ac voltage at the third phase input end, i.e., the C ac voltage, is rectified uncontrollably by the fifth switching tube Q5 and the sixth switching tube Q6 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage at both ends of the bus capacitor unit 14 is detected by the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is determined that the switching tubes in the third phase arm 13 are normal, otherwise, the phase is recorded as abnormal.

In some embodiments, referring to fig. 2, the control module 4 is further configured to control the second terminal of the fourth switch S4 to switch to connect with the second dummy contact K8, control the second terminal of the first switch S1 to switch to connect with the first dummy contact K1, and activate the first dc conversion module 5 to bleed the bus voltage across the bus capacitor unit 14.

For example, as shown in fig. 2, in the three-phase charging mode, after the detection of the first phase arm 11 is completed, the switch S4 is connected to the contact K8, the switch S1 is connected to the contact K1, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to bleed off the voltages of the first capacitor C1 and the second capacitor C2 of the bus, convert the energy of the first capacitor C3583 to the battery side, and drop the voltage of the bus at two ends of the bus capacitor unit 14 to 0, so as to avoid the influence on the detection of the second phase arm 12, and improve the accuracy and the safety of the self-detection.

Alternatively, referring to fig. 2, the second terminal of the fourth switch S4 is controlled to switch to connect with the second idle contact K8, and the second terminal of the second switch S2 is controlled to float, and the first dc conversion module 5 is activated to drain the bus voltage across the bus capacitor unit 14.

For example, as shown in fig. 2, in the three-phase charging mode, after the detection of the second phase arm 12 is completed, the switch S4 is connected to the contact K8, the switch S2 is suspended, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to discharge the voltages of the first capacitor C1 and the second capacitor C2 of the bus, convert the energy of the voltages to the battery side, and drop the voltage of the bus at the two ends of the bus capacitor unit 14 to 0, so as to avoid affecting the detection of the third phase arm 13, and improve the accuracy and the safety of the self-detection.

Alternatively, referring to fig. 2, the second terminal of the fourth switch S4 is controlled to switch to connect with the second idle contact K8, and the second terminal of the third switch S3 is controlled to float, and the first dc conversion module 5 is started to drain the bus voltage across the bus capacitor unit 14.

For example, as shown in fig. 2, in the three-phase charging mode, after the detection of the third phase leg 13 is completed, the switch S4 is connected to the contact K8, the switch S3 is suspended, and the first dc conversion module 5 is started, that is, the seventh switching tube Q7-the tenth switching tube Q10 are controlled to operate, so as to bleed off the voltages of the first capacitor C1 and the second capacitor C2 of the bus, so that the energy of the first capacitor C1 and the second capacitor C2 is converted to the battery side, and the voltage of the bus at two ends of the bus capacitor unit 14 is reduced to 0.

The following describes a process of the charging device implementing self-checking in different combinations of the switch modules when in the single-phase charging mode with reference to fig. 2.

In some embodiments, referring to fig. 2, when controlling the switching state of the switch module 2 according to the charging mode and performing fault detection and fault location on the three-phase arm of the PFC circuit module 1 according to the bus voltage, the control module 4 is specifically configured to, in the single-phase charging mode, control the second terminal of the fourth switch S4 to be connected to the sixth stationary contact K7, and control the second terminal of the first switch S1 to be connected to the first stationary contact K2, obtain the bus voltage at two ends of the bus capacitor unit 14, where the bus voltage is within the bus voltage threshold range, determine that the switching tubes of the first phase arm 11 are normal, or determine that the switching tubes of the first phase arm 11 have a fault when the bus voltage exceeds the bus voltage threshold range.

For example, as shown in fig. 2, when the single-phase charging mode is performed, the switch S4 is connected to the contact K7, and then the switch S1 is connected to the contact K2, if the switching tubes in the first-phase arm 11 are all normal, the first ac input end, i.e., the a ac voltage, is uncontrollably rectified through the first switching tube Q1 and the second switching tube Q2 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage across the bus capacitor unit 14 is detected through the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is indicated that the switching tubes in the first-phase arm 11 are normal, otherwise, the phase abnormality is recorded.

Or, referring to fig. 2, in the single-phase charging mode, controlling the second end of the fourth switch S4 to be connected to the sixth stationary contact K7, and controlling the second end of the second switch S2 to be connected to the third stationary contact K4, obtaining the bus voltage at two ends of the bus capacitor unit 14, where the bus voltage is within the bus voltage threshold range, determining that the switching tube of the second phase bridge arm 12 is normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the second phase bridge arm 12 fails.

For example, as shown in fig. 2, when the single-phase charging mode is performed, after the detection of the first phase arm 11 is completed, the second phase arm 12 is detected, specifically, the switch S4 is connected to the contact K7, then the switch S2 is connected to the contact K4, if the switching tubes in the second phase arm 12 are all normal, the second phase ac input end, that is, the B ac voltage, is uncontrollably rectified by the third switching tube Q3 and the fourth switching tube Q4 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage at the two ends of the bus capacitor unit 14 is detected by the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is determined that the switching tubes in the second phase arm 12 are normal, otherwise, the phase abnormality is recorded.

Or, referring to fig. 2, in the single-phase charging mode, controlling the second end of the fourth switch S4 to be connected to the sixth stationary contact K7, and controlling the second end of the third switch S3 to be connected to the fifth stationary contact K6, obtaining the bus voltage at the two ends 14 of the bus capacitor unit, where the bus voltage is within the bus voltage threshold range, determining that the switching tube of the third phase arm 13 is normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the third phase arm 13 fails.

For example, as shown in fig. 2, when the single-phase charging mode is performed, after the detection of the second phase arm 12 is completed, the third phase arm 13 is detected, specifically, the switch S4 is connected to the contact K7, then the switch S3 is connected to the contact K6, if the switching tubes in the third phase arm 13 are all normal, the ac voltage at the third phase input end, i.e., the C ac voltage, is rectified uncontrollably by the fifth switching tube Q5 and the sixth switching tube Q6 to charge the first capacitor C1 and the second capacitor C2 bus, and the bus voltage at both ends of the bus capacitor unit 14 is detected by the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is determined that the switching tubes in the third phase arm 13 are normal, otherwise, the phase is recorded as abnormal.

In some embodiments, referring to fig. 2, the control module 4 is further configured to control the second terminal of the fourth switch S4 to switch to connect with the second dummy contact K8, and control the second terminal of the first switch S1 to switch to connect with the first dummy contact K1, so as to activate the first dc conversion module 5 to drain the bus voltage across the bus capacitor unit 14.

For example, as shown in fig. 2, in the single-phase charging mode, after the detection of the first phase arm 11 is completed, the switch S4 is connected to the contact K8, the switch S1 is connected to the contact K1, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to bleed off the voltages of the first capacitor C1 and the second capacitor C2 of the bus, convert the energy of the first capacitor C3583 to the battery side, and drop the voltage of the bus at two ends of the bus capacitor unit 14 to 0, so as to avoid the influence on the detection of the second phase arm 12, and improve the accuracy and the safety of the self-detection.

Or, the second end of the fourth switch S4 is controlled to be switched to be connected with the second idle contact K8, and the second end of the second switch S2 is controlled to be suspended, so as to start the first dc conversion module 5, and thus the bus voltage across the bus capacitor unit 14 is discharged.

For example, as shown in fig. 2, in the single-phase charging mode, after the detection of the second phase arm 12 is completed, the switch S4 is connected to the contact K8, the switch S2 is suspended, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to discharge the voltages of the first capacitor C1 and the second capacitor C2 of the bus, convert the energy of the voltages to the battery side, and drop the voltage of the bus at the two ends of the bus capacitor unit 14 to 0, so as to avoid affecting the detection of the third phase arm 13, and improve the accuracy and the safety of the self-detection.

Or, the second end of the fourth switch S4 is controlled to be switched to be connected with the second idle contact K8, and the second end of the third switch S3 is controlled to be suspended, so as to start the first dc conversion module 5, and thus the bus voltage across the bus capacitor unit 14 is discharged.

For example, as shown in fig. 2, in the single-phase charging mode, after the detection of the third phase leg 13 is completed, the switch S4 is connected to the contact K8, the switch S3 is suspended, and the first dc conversion module 5 is started, that is, the seventh switching tube Q7-the tenth switching tube Q10 are controlled to operate, so as to bleed off the voltage of the first capacitor C1 and the second capacitor C2 of the bus, so that the energy of the first capacitor C1 and the second capacitor C2 is converted to the battery side, and the bus voltage at two ends of the bus capacitor unit 14 is reduced to 0.

Through the embodiment shown in fig. 2, the self-checking function of the charging devices under different power grids can be realized, the failed phase bridge arm is effectively identified and recorded, and a corresponding strategy is made to try to continue working according to the recorded fault data, so that charging is realized.

In some embodiments, referring to fig. 2, the control module 4 is further configured to determine that all the switching tubes of the three-phase bridge arm have a fault, which indicates that the charging device 10 is completely damaged and cannot be charged, so as to control the second terminal of the first switch S1, the second terminal of the second switch S2, and the third terminal of the third switch S3 to be suspended, so as to stop charging, and ensure charging safety.

Or determining that the switching tube of any one phase of the three-phase bridge arms has a fault, controlling the second end of the switch connected with the failed bridge arm to be suspended, controlling the second end of the fourth switch S4 to be connected with the sixth stationary contact K7, controlling the second ends of the switches connected with the two-phase bridge arms which do not have the fault to be connected with the first alternating current input end A, and controlling the two-phase bridge arms which do not have the fault to be switched on at the preset staggered angle. That is, when it is determined that any one of the three-phase arms is failed, the three-phase charging mode is stopped and the single-phase charging mode is attempted.

Or determining that the switching tubes of two-phase bridge arms in the three-phase bridge arms are in fault, controlling the second ends of the switches connected with the two-phase bridge arms in fault to be suspended, controlling the second ends of the switches connected with the one-phase bridge arms in non-fault to be connected with the first-phase alternating current input end A, and controlling the one-phase bridge arms in non-fault to work at preset power. For example, when any two-phase bridge arm fails, the switch correspondingly connected with the failed phase bridge arm is suspended, and the only normal phase bridge arm works at 1/3 with rated power to realize charging.

For example, as shown in fig. 3, taking a fault of one phase of three-phase bridge arms as an example, the switch in the faulty phase of bridge arm is suspended, the other two phase of bridge arm continues to operate, and the two phase of normal bridge arm is operated by switching 180 degrees alternately, for example, as shown in fig. 4, if the second phase of bridge arm 12 has a fault, the switch S2 is controlled to be suspended, the switch S1 is connected to the contact K2, the switch S3 is connected to the contact K6, and the switch S4 is connected to the contact K7, so that the charging device is in a single-phase charging mode, and the operating power is controlled to be 2/3 of the rated power.

Therefore, according to the charging device shown in fig. 2, in the embodiment of the present invention, the control module 4 performs fault detection and fault location on the three-phase bridge arm of the PFC circuit module 1 according to the bus voltage, so that when detecting that the hardware of some phases in the PFC circuit module 1 has an unrecoverable fault, the control module 4 can still control the other phase bridge arms to work by adjusting the switching state of the switch module 2 to realize charging, that is, the self-checking function is realized before the charging device 10 is started, thereby avoiding the problem that the bridge arm of some phase cannot work normally due to the fault.

Alternatively, in some embodiments, as shown in fig. 4, the switch module 2 of the present embodiment includes a fifth switch unit 25, a sixth switch unit 26, and a seventh switch unit 27.

The fifth switch unit 25 includes a seventh stationary contact K9, an eighth stationary contact K10, and a fifth switch S5, the seventh stationary contact K9 is connected to the first ac input end a, the eighth stationary contact K10 is connected to the second phase ac input end B, a first end of the fifth switch S5 is connected to the first phase arm in the three-phase arm, and a second end of the first switch S5 is selectively connected to the seventh stationary contact K9 or the eighth stationary contact K10, so as to control a connection state of the first phase arm.

And the sixth switch unit 26 comprises a ninth stationary contact K11, a tenth stationary contact K12 and a sixth switch S6, the ninth stationary contact K11 is connected with the second-phase alternating-current input end B, the tenth stationary contact K12 is connected with the first-phase alternating-current input end a, a first end of the sixth switch S6 is connected with the second-phase bridge arm in the three-phase bridge arm, and a second end of the sixth switch S6 is selectively connected with the ninth stationary contact K11 or the tenth stationary contact K12, and is used for controlling the connection state of the second-phase bridge arm.

And the seventh switch unit 27 includes an eleventh stationary contact K13, a twelfth stationary contact K14, and a seventh switch S7, the eleventh stationary contact K13 is connected to the third phase ac input terminal C, the twelfth stationary contact K14 is connected to the neutral input terminal N, a first end of the seventh switch S7 is connected to the third arm in the three-phase arm, and a second end of the seventh switch S7 is selectively connected to the eleventh stationary contact K13 and the twelfth stationary contact K14, so as to control the connection state of the third arm.

In some embodiments, as shown in fig. 4, the first phase bridge arm 11 of the embodiment of the present invention includes a first switching tube Q1 and a second switching tube Q2, a first end of the first switching tube Q1 is connected to a first input end of the first dc converting module 5, a second end of the first switching tube Q1 is connected to a first end of the second switching tube Q2, a control end of the first switching tube Q1 is connected to the control module 4, a second end of the second switching tube Q2 is connected to a second input end of the first dc converting module 5, a first node is located between the second end of the first switching tube Q1 and the first end of the second switching tube Q2, and the first node is connected to a first end of the fifth switch S5 through a first inductor L1.

And the second phase arm 12 comprises a third switch tube Q3 and a fourth switch tube Q4, a first end of the third switch tube Q3 is connected with a first input end of the first dc conversion module 5, a second end of the third switch tube Q3 is connected with a first end of the fourth switch tube Q4, a control end of the third switch tube Q3 is connected with the control module 4, a second end of the fourth switch tube Q4 is connected with a second input end of the first dc conversion module 5, a control end of the fourth switch tube Q4 is connected with the control module 4, a second node is arranged between the first end of the fourth switch tube Q4 and the second end of the third switch tube Q3, and the second node is connected with a first end of the sixth switch S6 through a second inductor L2.

And the third phase leg 13 includes a fifth switching tube Q5 and a sixth switching tube Q6, a first end of the fifth switching tube Q5 is connected to the first input end of the first dc conversion module 5, a second end of the fifth switching tube Q5 is connected to the first end of the sixth switching tube Q6, a control end of the fifth switching tube Q5 is connected to the control module 4, a second end of the sixth switching tube Q6 is connected to the second input end of the first dc conversion module 5, a control end of the sixth switching tube Q6 is connected to the control module 4, a third node is provided between the first end of the sixth switching tube Q6 and the second end of the fifth switching tube Q5, and the third node is connected to the first end of the seventh switch S7 through a third inductor L3.

The PFC circuit module 1 further includes a third capacitor C3 and a second resistor R2, a first end of the third capacitor C3 is connected to a first end of the first switch tube Q1, a first end of the third switch tube Q3, and a first end of the fifth switch tube Q5, a second end of the first capacitor C1 is connected to a second end of the second switch tube Q2, a second end of the fourth switch tube Q4, and a second end of the sixth switch tube Q6, a first end of the second resistor R2 is connected to a first end of the third capacitor C3, and a second end of the second resistor R2 is connected to a second end of the third capacitor C3.

The following describes a process of the charging device implementing self-checking in different combinations of the switch modules when in the three-phase charging mode, with reference to fig. 4.

In some embodiments, referring to fig. 4, when controlling the switching state of the switch module 2 according to the charging mode and performing fault detection and fault location on the three-phase arm of the PFC circuit module 1 according to the bus voltage, the control module 4 is specifically configured to, during the three-phase charging mode, control the second terminal of the seventh switch S7 to be connected to the twelfth stationary contact K14, and control the second terminal of the fifth switch S5 to be connected to the seventh stationary contact K9, obtain the bus voltage across the third capacitor C3, where the bus voltage is within the bus voltage threshold range, determine that the switching tubes of the first phase arm 11 and the third phase arm 13 are both normal, or determine that the switching tube of the first phase arm 11 or the third phase arm 13 fails when the bus voltage exceeds the bus voltage threshold range.

Or, in the three-phase charging mode, controlling the second end of the seventh switch S7 to be connected with the twelfth stationary contact K14, and controlling the second end of the sixth switch S6 to be connected with the ninth stationary contact K11, obtaining the bus voltage at two ends of the third capacitor C3, wherein the bus voltage is within the bus voltage threshold range, determining that the switching tubes of the second phase arm 12 and the third phase arm 13 are normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the second phase arm 12 or the third phase arm 13 has a fault.

For example, as shown in fig. 4, when in the three-phase charging mode, switch S7 is connected to contact K14, and then switch S5 is connected to contact K9, if the switching tubes in first phase arm 11 and third phase arm 13 are normal, the first ac input end, i.e., the a ac voltage, is rectified uncontrollably through first switching tube Q1 and second switching tube Q2, fifth switching tube Q5 and sixth switching tube Q6 to charge the bus of third capacitor C3, and the bus voltage across third capacitor C3 is detected by voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is indicated that the switching tubes in first phase arm 11 and third phase arm 13 are normal, otherwise, one of the abnormal conditions is recorded. Furthermore, switch S7 is connected to contact K14, then switch S6 is connected to contact K11, if the switching tubes in second and

third phase arms

12 and 13 are normal, the second phase ac input end, i.e., the B-phase ac voltage, is rectified uncontrollably through third and fourth switching tubes Q3 and Q4, fifth switching tube Q5, and sixth switching tube Q6 to charge the bus of third capacitor C3, and the bus voltage across third capacitor C3 is detected by voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is indicated that the switching tubes in second and

third phase arms

12 and 13 are normal, otherwise, some abnormal condition is recorded.

Further, in combination with the above description, whether a fault occurs in the three-phase bridge arm is determined according to the detection results recorded by detecting the first phase bridge arm 11 and the third phase bridge arm 13, and detecting the second phase bridge arm 12 and the third phase bridge arm 13, specifically, if it is detected that the switching tubes in the first phase bridge arm 11 and the third phase bridge arm 13 are both normal and the switching tubes in the second phase bridge arm 12 and the third phase bridge arm 13 are both normal, it is determined that the PFC circuit module 1 has not failed, and the charging device 10 can operate normally; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are both normal and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are abnormal, it is indicated that the switching tube in the second phase arm 12 has a fault; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are abnormal and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are both normal, it is indicated that the switching tube in the first phase arm 11 has a fault; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are abnormal, and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are abnormal, it indicates that the switching tubes in the three phase arms are both failed or that the switching tube in the third phase arm 13, which is a power frequency bridge, is abnormal. Therefore, when the three-phase charging mode is realized through the detection, the self-checking process of the high-frequency switch bridge arm of the charging device is realized.

The following describes a process of the charging device implementing self-checking in different combinations of the switch modules when in the single-phase charging mode with reference to fig. 4.

In some embodiments, referring to fig. 4, when controlling the switching state of the switch module 2 according to the charging mode and performing fault detection and fault location on the three-phase arm of the PFC circuit module 1 according to the bus voltage, the control module 4 is specifically configured to, in the single-phase charging mode, control the second terminal of the seventh switch S7 to be connected to the twelfth stationary contact K14, and control the second terminal of the fifth switch S5 to be connected to the seventh stationary contact K9, obtain the bus voltage across the third capacitor C3, where the bus voltage is within the bus voltage threshold range, determine that the switching tubes of the first phase arm 11 and the third phase arm 13 are normal, or determine that the switching tube of the first phase arm 11 or the third phase arm 13 is faulty if the bus voltage exceeds the bus voltage threshold range.

Or, in the single-phase charging mode, controlling the second end of the seventh switch S7 to be connected with the twelfth stationary contact K14, and controlling the second end of the sixth switch S6 to be connected with the tenth stationary contact K12, obtaining the bus voltage at two ends of the third capacitor C3, wherein the bus voltage is within the bus voltage threshold range, determining that the switching tubes of the second phase arm 12 and the third phase arm 13 are normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the second phase arm 12 or the third phase arm 13 has a fault.

In some embodiments, referring to fig. 4, the control module 4 is further configured to determine that the PFC circuit module 1 is normal when the switching tubes of the first phase leg 11 and the third phase leg 13 are normal and the switching tubes of the second phase leg 12 and the third phase leg 13 are determined to be normal.

Or when the switching tubes of the first phase arm 11 and the third phase arm 13 are normal and it is determined that the switching tube of the second phase arm 12 or the switching tube of the third phase arm 13 fails, it is determined that the second phase arm 12 fails.

Or, when the switching tubes of the first phase arm 11 or the third phase arm 13 are failed and it is determined that the switching tubes of the second phase arm 12 and the third phase arm 13 are normal, it is determined that the first phase arm 11 is failed.

Or when the switching tubes of the first phase arm 11 or the third phase arm 13 are in fault and the switching tubes of the second phase arm 12 or the third phase arm 13 are determined to be in fault, determining that all the three phase arms are in fault or determining that the third phase arm 13 is in fault.

For example, as shown in fig. 4, when in the single-phase charging mode, the switch S7 is connected to the contact K14, and then the switch S5 is connected to the contact K9, if the switching tubes of the first phase arm 11 or the third phase arm 13 are normal, the first ac input end, i.e., the a ac voltage, is rectified uncontrollably by the first switching tube Q1 and the second switching tube Q2, the fifth switching tube Q5, and the sixth switching tube Q6 to charge the bus of the third capacitor C3, and the bus voltage across the third capacitor C3 is detected by the voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is determined that the switching tubes of the first phase arm 11 and the third phase arm 13 are normal, otherwise, one of the phases is recorded as abnormal. Furthermore, switch S7 is connected to contact K14, then switch S6 is connected to contact K12, if the switching tubes of second and

third phase arms

12 and 13 are normal, the B-phase alternating current input end, i.e., the B-phase alternating current voltage, is rectified uncontrollably through third and fourth switching tubes Q3 and Q4, fifth switching tube Q5, and sixth switching tube Q6 to charge the bus of third capacitor C3, and the bus voltage across third capacitor C3 is detected by voltage detection module 3, if the detected bus voltage value is within the bus voltage threshold range, it is indicated that the switching tubes of second and

third phase arms

12 and 13 are normal, otherwise, some abnormal condition is recorded.

Further, in combination with the above description, whether a fault occurs in the three-phase bridge arm is determined according to the detection results recorded by detecting the first phase bridge arm 11 and the third phase bridge arm 13, and detecting the second phase bridge arm 12 and the third phase bridge arm 13, specifically, if it is detected that the switching tubes in the first phase bridge arm 11 and the third phase bridge arm 13 are both normal and the switching tubes in the second phase bridge arm 12 and the third phase bridge arm 13 are both normal, it is determined that the PFC circuit module 1 has not failed, and the charging device 10 can operate normally; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are both normal and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are abnormal, it is indicated that the switching tube in the second phase arm 12 has a fault; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are abnormal and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are both normal, it is indicated that the switching tube in the first phase arm 11 has a fault; or, if it is detected that the switching tubes in the first phase arm 11 and the third phase arm 13 are abnormal, and it is detected that the switching tubes in the second phase arm 12 and the third phase arm 13 are abnormal, it indicates that the switching tubes in the three phase arms are both failed or that the switching tube in the third phase arm 13, which is a power frequency bridge, is abnormal. Therefore, when the single-phase charging mode is realized through the detection, the self-checking process of the bridge arm of the high-frequency switch of the charging device is realized.

In some embodiments, referring to fig. 4, the control module 4 is further configured to control the second terminal of the seventh switch S7 to be floating and the second terminal of the fifth switch S5 to be floating, and activate the first dc conversion module 5 to drain the bus voltage across the third capacitor C3.

For example, as shown in fig. 4, after the detection of the first phase arm 11 and the third phase arm 13 is completed, the switch S7 is controlled to be suspended, the switch S5 is suspended, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to bleed off the capacitor voltage of the bus C3, convert the energy thereof to the battery side, and drop the voltage across the bus C3 to 0, so as to avoid the influence on the subsequent detection and improve the accuracy and safety of the self-detection.

Alternatively, the second terminal of the seventh switch S7 is controlled to be floating, the second terminal of the sixth switch S6 is controlled to be floating, and the first dc converting module 5 is activated to drain the bus voltage across the third capacitor C3.

For example, as shown in fig. 4, after the detection of the second phase arm 12 and the third phase arm 13 is completed, the switch S7 is controlled to be suspended, the switch S6 is suspended, the first dc conversion module 5 is started, that is, the seventh switching tube Q7 to the tenth switching tube Q10 are controlled to operate, so as to bleed off the capacitor voltage of the bus C3, convert the energy thereof to the battery side, and drop the voltage across the bus C3 to 0, so as to avoid the influence on the subsequent detection and improve the accuracy and safety of the self-detection.

Through the embodiment shown in fig. 4, the self-checking function of the charging devices under different power grids can be realized, the failed phase bridge arm is effectively identified and recorded, and a corresponding strategy is made to try to continue working according to the recorded fault data, so that charging is realized.

In some embodiments, the control module 4 is further configured to indicate that the charging device 10 is completely damaged and cannot be charged when the third phase leg 13 fails or both the first phase leg 11 and the second phase leg 12 fail, so as to control the second end of the first switch S1, the second end of the second switch S2, and the second end of the third switch S3 to be suspended, so as to stop charging, and ensure charging safety.

Or when the first phase arm 11 or the second phase arm 12 fails, controlling the second end of the third switch S3 to be connected with the twelfth stationary contact K14, controlling the second ends of the switches connected with the failed one of the first phase arm 11 and the second phase arm 12 to be suspended, and controlling the PFC circuit module 1 to operate in the single-phase charging mode. That is, when it is determined that the first phase arm 11 or the second phase arm 12 is out of order, the three-phase charging mode is stopped and the single-phase charging mode is attempted. For example, when charging, no matter the charging device 10 is in a three-phase power supply system or a single-phase power supply system, the S7 switch is controlled to be connected to the contact K14, and simultaneously the switch correspondingly connected to the failed phase arm is suspended, and at this time, the charging power is only 3.3 KW.

For example, as shown in fig. 5, taking the second phase arm 12 as an example of a fault, the switch S6 is suspended, the switch S5 is connected to the contact K9, and the switch S7 is connected to the contact K14, so that the charging device 10 is in the single-phase charging mode, and the operating power is 1/2 of the single-phase rated power.

In some embodiments, as shown in fig. 2 or 4, the first dc conversion module 5 of the embodiment of the present invention includes a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9, a tenth switching tube Q10, a first transformer U1, an eleventh switching tube Q11, a twelfth switching tube Q12, a thirteenth switching tube Q13, a fourteenth switching tube Q14, and a sixth capacitor C6.

Wherein, the first end of the seventh switch tube Q7 and the first end of the ninth switch tube Q9 are connected together to form a first input end of the first dc conversion module 5, and the second end of the eighth switch tube Q8 and the second end of the tenth switch tube Q10 are connected together to form a second input end of the first dc conversion module 5; a first end of the seventh switching tube Q7 is connected to a first end of the fifth switching tube Q5, a second end of the seventh switching tube Q7 is connected to a first end of the eighth switching tube Q8, a control end of the seventh switching tube Q7 is connected to the control module 4, a second end of the eighth switching tube Q8 is connected to a second end of the sixth switching tube Q6, a control end of the eighth switching tube Q8 is connected to the control module 4, and a fifth node is provided between the first end of the eighth switching tube Q8 and the second end of the seventh switching tube Q7.

And a first end of the ninth switching tube Q9 is connected to the first end of the seventh switching tube Q7, a second end of the ninth switching tube Q9 is connected to the first end of the tenth switching tube Q10, a control end of the ninth switching tube Q9 is connected to the control module 4, a second end of the tenth switching tube Q10 is connected to the second end of the eighth switching tube Q8, a control end of the tenth switching tube Q10 is connected to the control module 4, and a sixth node is arranged between the first end of the tenth switching tube Q10 and the second end of the ninth switching tube Q9.

And the first transformer U1 includes a primary winding and a secondary winding, a first end of the primary winding is connected to the fifth node through a fourth inductor L4, and a second end of the primary winding is connected to the sixth node through a fourth capacitor C4.

And a first end of an eleventh switching tube Q11 is connected with a first end of the power battery 30, a second end of the eleventh switching tube Q11 is connected with a first end of a twelfth switching tube Q12, a control end of the eleventh switching tube Q11 is connected with the control module 4, a second end of the twelfth switching tube Q12 is connected with a second end of the power battery 30, a control end of the twelfth switching tube Q12 is connected with the control module 4, a seventh node is arranged between the first end of the twelfth switching tube Q12 and the second end of the eleventh switching tube Q11, and the seventh node is connected with the first end of the secondary coil through a fifth inductor L5.

And a first end of a thirteenth switching tube Q13 is connected with a first end of the power battery 30, a second end of a thirteenth switching tube Q13 is connected with a first end of a fourteenth switching tube Q14, a control end of the thirteenth switching tube Q13 is connected with the control module 4, a second end of the fourteenth switching tube Q14 is connected with a second end of the power battery 30, a control end of the fourteenth switching tube Q14 is connected with the control module 4, an eighth node is arranged between the first end of the fourteenth switching tube Q14 and the second end of the thirteenth switching tube Q13, and the eighth node is connected with a second end of the secondary coil through a fifth capacitor C5.

A first end of the sixth capacitor C6 is connected to the first end of the thirteenth switching tube Q13 and the first end of the power battery 30, respectively, and a second end of the sixth capacitor C6 is connected to the second end of the fourteenth switching tube Q14 and the second end of the power battery 30, respectively.

In summary, according to the charging apparatus of the embodiment of the present invention, the control module 4 controls the switch state of the switch module 2 based on the charging mode, so as to control the on-state of the three-phase bridge arm, so that the PFC circuit module 1 rectifies the input alternating current to realize the purpose of charging, and, in the embodiment of the invention, the control module 4 carries out fault detection and fault location on the three-phase bridge arm of the PFC circuit module 1 according to the bus voltage, so that before charging is started, when the hardware of some phases in the PFC circuit module 1 is detected to have unrecoverable faults, the control module 4 flexibly adjusts the on-off state of the switch module 2 to control the different staggered phase bridge arms of the PFC circuit module 1 to work to realize charging, that is, as long as at least one of the two-phase arms of the high-frequency arm in the PFC circuit module 1 is normal, the charging can be realized, so that the problem that one phase of bridge arm fails to work normally due to the fault is avoided.

In some embodiments, as shown in fig. 2 or 4, the charging device 10 according to the embodiment of the present invention further includes a second dc conversion module 6, an input end of the second dc conversion module 6 is connected to the power battery 30, and an output end of the second dc conversion module 6 is connected to the storage battery 40, for converting the output voltage of the power battery into a voltage required by the storage battery.

In some embodiments, as shown in fig. 2, the second dc conversion module 6 of the embodiment of the present invention includes a seventh capacitor C7, the first half-bridge LLC circuit unit 51 and the second half-bridge LLC circuit unit 52. The control end of the first half-bridge LLC circuit unit 51 and the control end of the second half-bridge LLC circuit unit 52 are both connected with the control module 4, the control module 4 is used for controlling the first half-bridge LLC circuit unit 51 and the second half-bridge LLC circuit unit 52 at intervals of a preset phase angle in a staggered manner, so that a direct current signal output by the first direct current conversion module 5 is converted into a direct current signal required by the storage battery 40, and the first half-bridge LLC circuit unit 51 and the second half-bridge LLC circuit unit 52 are controlled to be switched on in a staggered manner, so that the efficiency of the half-bridge LLC circuit unit can be effectively improved, and the output voltage current ripple is reduced.

In an embodiment, as shown in fig. 2, an input terminal of the first half-bridge LLC circuit unit 51 is connected to the power battery 30, and an output terminal of the first half-bridge LLC circuit unit 51 is connected to the storage battery 40; the input end of the second half-bridge LLC circuit unit 52 is connected with the power battery 30, and the output end of the second half-bridge LLC circuit unit 52 is connected with the storage battery 40; a first terminal of the seventh capacitor C7 is connected to the output terminal of the first half-bridge LLC circuit unit 51, and a second terminal of the seventh capacitor C7 is connected to the output terminal of the second half-bridge LLC circuit unit, so as to perform a filtering function.

In some embodiments, the first half-bridge LLC circuit unit 51 includes a nineteenth switching tube Q19, a twentieth switching tube Q20, a second transformer U2, a fifteenth switching tube Q15, and a sixteenth switching tube Q16.

As shown in fig. 2, a first end of a fifteenth switching tube Q15 is a first input end of the first half-bridge LLC circuit unit 51, a first end of the fifteenth switching tube Q15 is connected to the power battery 30, and a control end of the fifteenth switching tube Q15 is connected to the control module 4. A first end of a sixteenth switching tube Q16 is connected to a second end of a fifteenth switching tube Q15, a second end of the sixteenth switching tube Q16 is a second input end of the first half-bridge LLC circuit unit 51, a second end of the sixteenth switching tube Q16 is connected to the power battery 30, a control end of the sixteenth switching tube Q16 is connected to the control module 4, and a ninth node is provided between the first end of the sixteenth switching tube Q16 and the second end of the fifteenth switching tube Q15.

And the second transformer U2 is used for transforming the dc signal output by the first dc conversion module 5, i.e. converting the dc signal output by the first dc conversion module 5 into a low-voltage dc signal required by the battery 40, so as to supply power to the battery 40. A first end of the second transformer U2 is connected to the ninth node through the sixth inductor L6 and the eighth capacitor C8, a second end of the second transformer U2 is connected to a second end of the nineteenth switching tube Q19, a second end of the twentieth switching tube Q20 is connected to a third end of the second transformer U2, and a control end of the nineteenth switching tube Q19 and a control end of the twentieth switching tube Q20 are both connected to the control module 4. The first end of the nineteenth switching tube Q19 is connected to the first end of the twentieth switching tube Q20 and the first end of the battery 30, and the control module 4 controls the nineteenth switching tube Q19, the twentieth switching tube Q20, the fifteenth switching tube Q15 and the sixteenth switching tube Q16 to be turned on and off so as to supply power to the battery 40.

In some embodiments, the second half-bridge LLC circuit unit 52 includes a seventeenth switching tube Q17, an eighteenth switching tube Q18, a third transformer U3, a twenty-first switching tube Q21, and a twenty-second switching tube Q22.

As shown in fig. 2, a first end of the seventeenth switching tube Q17 is a first input end of the second half-bridge LLC circuit unit 52, a first end of the seventeenth switching tube Q17 is connected to the power battery 30, and a control end of the seventeenth switching tube Q17 is connected to the control module 4. The first end of the eighteenth switching tube Q18 is connected to the second end of the seventeenth switching tube Q17, the second end of the eighteenth switching tube Q18 is the second input end of the second half-bridge LLC circuit unit 52, the second end of the eighteenth switching tube Q18 is connected to the power battery 30, the control end of the eighteenth switching tube Q18 is connected to the control module 4, and a tenth node is provided between the first end of the eighteenth switching tube Q18 and the second end of the seventeenth switching tube Q17.

And the third transformer U3 is configured to transform the dc signal output by the first dc conversion module 5, that is, convert the dc signal output by the first dc conversion module 5 into a low-voltage dc signal required by the battery 40, so as to supply power to the battery 40. A first end of the third transformer U3 is connected to the tenth node through the seventh inductor L6 and the ninth capacitor C8, a second end of the third transformer U3 is connected to a second end of the twenty-first switching tube Q21, a second end of the twenty-second switching tube Q22 is connected to a third end of the second transformer U2, and a control end of the twenty-first switching tube Q21 and a control end of the twenty-second switching tube Q22 are both connected to the control module 4. The first end of the twenty-first switching tube Q21 is connected with the first end of the twenty-second switching tube Q22 and the first end of the storage battery 30, and the control module 4 is turned on and turned off by controlling the seventeenth switching tube Q17, the eighteenth switching tube Q18, the twenty-first switching tube Q21 and the twenty-second switching tube Q22, so as to supply power to the storage battery 40.

A vehicle 100 according to an embodiment of the present invention includes a power battery 30, a storage battery 40, and the charging device 10 according to the above embodiment, as shown in fig. 6.

In the embodiment, as shown in fig. 2 or 3, the charging device 10 is connected to the power battery 30 and the storage battery 40 respectively, and is used for charging the power battery 30 and the storage battery 40.

According to the vehicle 100 of the embodiment of the present invention, by using the charging device 10 provided in the above embodiment, the self-test of the charging device 100 can be realized while the power battery 30 and the storage battery 40 are charged, and the problem that a certain phase arm fails to work normally due to a failure is avoided.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A charging device, comprising:

the PFC circuit module is used for carrying out power factor correction on input alternating current and outputting a direct current signal after the power factor correction, and at least comprises a three-phase bridge arm;

the first end of the switch module is connected with the input end of the PFC circuit module, and the second end of the switch module is connected with the alternating current input end and used for controlling the on-state of a three-phase bridge arm in the PFC circuit module;

the voltage detection module is connected with the output end of the PFC circuit module and used for detecting the bus voltage;

and the control module is respectively connected with the PFC circuit module and the control end of the switch module and is used for controlling the switch state of the switch module according to a charging mode and carrying out fault detection and fault positioning on a three-phase bridge arm of the PFC circuit module according to the bus voltage.

2. The charging device of claim 1, further comprising:

the input end of the first direct current conversion module is connected with the output end of the PFC circuit module, and the output end of the first direct current conversion module is connected with a power battery and used for converting a direct current signal after power factor correction into a direct current signal required by the power battery;

the control module is connected with the control end of the first direct current conversion module and is further used for controlling the first direct current conversion module to start after fault detection and fault location are carried out on a three-phase bridge arm of the PFC circuit module so as to discharge the bus voltage.

3. The charging device of claim 2, wherein the switch module comprises:

the first switch unit comprises a first static contact, a first idle contact and a first switch, the first static contact is connected with a first alternating current input end, the first idle contact is idle, a first end of the first switch is connected with a first phase bridge arm in the three-phase bridge arms, a second end of the first switch is selectively connected with the first static contact or the first idle contact, and the first switch unit is used for controlling the connection state of the first phase bridge arm;

the second switch unit comprises a second stationary contact, a third stationary contact and a second switch, the second stationary contact is connected with a second-phase alternating current input end, the third stationary contact is connected with the first-phase alternating current input end, a first end of the second switch is connected with a second-phase bridge arm in the three-phase bridge arms, a second end of the second switch is selectively connected with the second stationary contact or the third stationary contact, and the second switch unit is used for controlling the connection state of the second-phase bridge arm;

the third switch unit comprises a fourth stationary contact, a fifth stationary contact and a third switch, the fourth stationary contact is connected with a third-phase alternating current input end, the fifth stationary contact is connected with the first-phase alternating current input end, a first end of the third switch is connected with a third phase bridge arm in the three-phase bridge arms, a second end of the third switch is selectively connected with the fourth stationary contact or the fifth stationary contact, and the third switch unit is used for controlling the communication state of the third phase bridge arm;

the fourth switch unit comprises a sixth stationary contact, a second idle contact and a fourth switch, the sixth stationary contact is connected with a neutral input end, the second idle contact is idle, a first end of the fourth switch is connected with a charging loop connecting end of the PFC circuit module, a second end of the fourth switch is selectively connected with the sixth stationary contact or the second idle contact, and the fourth switch unit is used for controlling the connection state of a single-phase charging loop.

4. A charging arrangement as claimed in claim 3,

the first phase bridge arm comprises a first switch tube and a second switch tube, wherein a first end of the first switch tube is connected with a first input end of the first direct current conversion module, a second end of the first switch tube is connected with a first end of the second switch tube, a control end of the first switch tube is connected with the control module, a second end of the second switch tube is connected with a second input end of the first direct current conversion module, a first node is arranged between the second end of the first switch tube and the first end of the second switch tube, and the first node is connected with the first end of the first switch through a first inductor;

the second phase bridge arm comprises a third switching tube and a fourth switching tube, wherein the first end of the third switching tube is connected with the first input end of the first direct current conversion module, the second end of the third switching tube is connected with the first end of the fourth switching tube, the control end of the third switching tube is connected with the control module, the second end of the fourth switching tube is connected with the second input end of the first direct current conversion module, the control end of the fourth switching tube is connected with the control module, a second node is arranged between the first end of the fourth switching tube and the second end of the third switching tube, and the second node is connected with the first end of the second switch through a second inductor;

the third phase bridge arm comprises a fifth switching tube and a sixth switching tube, wherein the first end of the fifth switching tube is connected with the first input end of the first direct current conversion module, the second end of the fifth switching tube is connected with the first end of the sixth switching tube, the control end of the fifth switching tube is connected with the control module, the second end of the sixth switching tube is connected with the second input end of the first direct current conversion module, the control end of the sixth switching tube is connected with the control module, a third node is arranged between the first end of the sixth switching tube and the second end of the fifth switching tube, and the third node is connected with the first end of the third switch through a third inductor;

the PFC circuit module further comprises a bus capacitor unit, the bus capacitor unit comprises a first capacitor and a second capacitor, a first end of the first capacitor is connected with a first end of the first switch tube, a first end of the third switch tube and a first end of the fifth switch tube respectively, a second end of the first capacitor is connected with a first end of the second capacitor, a second end of the second capacitor is connected with a second end of the second switch tube, a second end of the fourth switch tube and a second end of the sixth switch tube respectively, a fourth node is arranged between the second end of the first capacitor and the first end of the second capacitor, and the fourth node is connected with a first end of the fourth switch;

the PFC circuit module further comprises a first resistor, wherein a first end of the first resistor is connected with a first end of the first capacitor, and a second end of the first resistor is connected with a second end of the second capacitor.

5. The charging device according to claim 4, wherein the control module is specifically configured to control the switch states of the switch modules according to a charging mode, and perform fault detection and fault location on the three-phase bridge arm of the PFC circuit module according to the bus voltage,

in a three-phase charging mode, controlling a second end of a fourth switch to be connected with the sixth stationary contact, controlling a second end of the first switch to be connected with the first stationary contact, obtaining bus voltages at two ends of the bus capacitor unit, wherein the bus voltages are within a bus voltage threshold range, determining that a switching tube of the first-phase bridge arm is normal, or determining that the switching tube of the first-phase bridge arm has a fault when the bus voltages exceed the bus voltage threshold range;

or, in a three-phase charging mode, controlling a second end of a fourth switch to be connected with the sixth stationary contact, and controlling a second end of the second switch to be connected with the second stationary contact, so as to obtain a bus voltage at two ends of the bus capacitor unit, wherein the bus voltage is within a bus voltage threshold range, and determining that a switching tube of the second phase bridge arm is normal, or determining that the switching tube of the second phase bridge arm has a fault when the bus voltage exceeds the bus voltage threshold range;

or, in a three-phase charging mode, controlling a second end of a fourth switch to be connected with the sixth stationary contact, controlling a second end of the third switch to be connected with the fourth stationary contact, obtaining bus voltages at two ends of the bus capacitor unit, wherein the bus voltages are within a bus voltage threshold range, determining that a switching tube of the third phase bridge arm is normal, or determining that the switching tube of the third phase bridge arm has a fault if the bus voltages exceed the bus voltage threshold range.

6. The charging device according to claim 4, wherein the control module is configured to, when controlling the switch states of the switch modules according to a charging mode and performing fault detection and fault location on the three-phase bridge arm of the PFC circuit module according to the bus voltage, specifically, when performing the single-phase charging mode,

controlling a second end of the fourth switch to be connected with the sixth stationary contact, and controlling a second end of the first switch to be connected with the first stationary contact, so as to obtain bus voltages at two ends of the bus capacitor unit, wherein the bus voltages are within a bus voltage threshold range, and determining that a switching tube of the first-phase bridge arm is normal, or determining that the switching tube of the first-phase bridge arm is failed when the bus voltages exceed the bus voltage threshold range;

or controlling a second end of the fourth switch to be connected with the sixth stationary contact, and controlling a second end of the second switch to be connected with the third stationary contact, so as to obtain bus voltages at two ends of the bus capacitor unit, wherein the bus voltages are within a bus voltage threshold range, and determining that a switching tube of the second phase bridge arm is normal, or determining that the switching tube of the second phase bridge arm is failed when the bus voltages exceed the bus voltage threshold range;

or controlling the second end of the fourth switch to be connected with the sixth stationary contact and controlling the second end of the third switch to be connected with the fifth stationary contact, obtaining bus voltages at two ends of the bus capacitor unit, wherein the bus voltages are within a bus voltage threshold range, determining that the switch tube of the third phase bridge arm is normal, or determining that the switch tube of the third phase bridge arm has a fault when the bus voltages exceed the bus voltage threshold range.

7. A charging arrangement as claimed in claim 5 or 6, in which the control module is also adapted to,

controlling the second end of the fourth switch to be switched to be connected with the second idle contact, controlling the second end of the first switch to be switched to be connected with the first idle contact, and starting the first direct current conversion module to work so as to discharge the bus voltage at two ends of the bus capacitor unit;

or, the second end of the fourth switch is controlled to be switched to be connected with the second idle contact, the second end of the second switch is controlled to be suspended, and the first direct current conversion module is started to discharge the bus voltage at the two ends of the bus capacitor unit;

or the second end of the fourth switch is controlled to be switched to be connected with the second idle contact, the second end of the third switch is controlled to be suspended, and the first direct current conversion module is started to discharge the bus voltage at the two ends of the bus capacitor unit.

8. A charging arrangement as claimed in claim 5 or 6, in which the control module is also adapted to,

determining that all the switch tubes of the three-phase bridge arm have faults, and controlling the second end of the first switch, the second end of the second switch and the third end of the third switch to be suspended to stop charging;

or determining that a switching tube of any one phase of the three-phase bridge arms fails, controlling a second end of a switch connected with the failed bridge arm to be suspended, controlling a second end of a fourth switch to be connected with a sixth stationary contact, controlling second ends of switches connected with two non-failed bridge arms to be connected with a first alternating current input end, and controlling the two non-failed bridge arms to be switched on by a preset angle in a staggered manner;

or determining that the switching tubes of two-phase bridge arms in the three-phase bridge arms are in fault, controlling the second ends of the switches connected with the two-phase bridge arms in fault to be suspended, controlling the second ends of the switches connected with the one-phase bridge arms in non-fault to be connected with the first alternating current input end, and controlling the one-phase bridge arms in non-fault to work at preset power.

9. The charging device of claim 2, wherein the switch module comprises:

the fifth switch unit comprises a seventh stationary contact, an eighth stationary contact and a fifth switch, the seventh stationary contact is connected with the first alternating-current input end, the eighth stationary contact is connected with the second-phase alternating-current input end, the first end of the fifth switch is connected with the first-phase bridge arm in the three-phase bridge arms, and the second end of the first switch is selectively connected with the seventh stationary contact or the eighth stationary contact and used for controlling the connection state of the first-phase bridge arm;

a sixth switch unit, including a ninth stationary contact, a tenth stationary contact and a sixth switch, where the ninth stationary contact is connected to the second-phase ac input end, the tenth stationary contact is connected to the first-phase ac input end, a first end of the sixth switch is connected to a second-phase bridge arm in the three-phase bridge arms, and a second end of the sixth switch is selectively connected to the ninth stationary contact or the tenth stationary contact, and is configured to control a connection state of the second-phase bridge arm;

the seventh switch unit comprises an eleventh stationary contact, a twelfth stationary contact and a seventh switch, the eleventh stationary contact is connected with the third-phase alternating-current input end, the twelfth stationary contact is connected with the neutral-line input end, the first end of the seventh switch is connected with the third bridge arm in the three-phase bridge arm, and the second end of the seventh switch is selectively connected with the eleventh stationary contact and the twelfth stationary contact and used for controlling the connection state of the third-phase bridge arm.

10. A charging arrangement as claimed in claim 9,

the first phase bridge arm comprises a first switch tube and a second switch tube, wherein a first end of the first switch tube is connected with a first input end of the first direct current conversion module, a second end of the first switch tube is connected with a first end of the second switch tube, a control end of the first switch tube is connected with the control module, a second end of the second switch tube is connected with a second input end of the first direct current conversion module, a first node is arranged between the second end of the first switch tube and the first end of the second switch tube, and the first node is connected with a first end of a fifth switch through a first inductor;

the second phase bridge arm comprises a third switching tube and a fourth switching tube, wherein the first end of the third switching tube is connected with the first input end of the first direct current conversion module, the second end of the third switching tube is connected with the first end of the fourth switching tube, the control end of the third switching tube is connected with the control module, the second end of the fourth switching tube is connected with the second input end of the first direct current conversion module, the control end of the fourth switching tube is connected with the control module, a second node is arranged between the first end of the fourth switching tube and the second end of the third switching tube, and the second node is connected with the first end of the sixth switch through a second inductor;

the third phase bridge arm comprises a fifth switching tube and a sixth switching tube, wherein the first end of the fifth switching tube is connected with the first input end of the first direct current conversion module, the second end of the fifth switching tube is connected with the first end of the sixth switching tube, the control end of the fifth switching tube is connected with the control module, the second end of the sixth switching tube is connected with the second input end of the first direct current conversion module, the control end of the sixth switching tube is connected with the control module, a third node is arranged between the first end of the sixth switching tube and the second end of the fifth switching tube, and the third node is connected with the first end of the seventh switch through a third inductor;

the PFC circuit module further comprises a third capacitor and a second resistor, wherein the first end of the third capacitor is connected with the first end of the first switch tube, the first end of the third switch tube and the first end of the fifth switch tube respectively, the second end of the first capacitor is connected with the second end of the second switch tube, the second end of the fourth switch tube and the second end of the sixth switch tube respectively, the first end of the second resistor is connected with the first end of the third capacitor, and the second end of the second resistor is connected with the second end of the third capacitor.

11. The charging device according to claim 10, wherein the control module is specifically configured to control the switch states of the switch modules according to a charging mode, and perform fault detection and fault location on the three-phase bridge arm of the PFC circuit module according to the bus voltage,

in a three-phase charging mode, controlling a second end of a seventh switch to be connected with the twelfth stationary contact, controlling a second end of a fifth switch to be connected with the seventh stationary contact, obtaining a bus voltage at two ends of the third capacitor, wherein the bus voltage is within a bus voltage threshold range, determining that switching tubes of the first phase bridge arm and the third phase bridge arm are normal, or determining that the bus voltage exceeds the bus voltage threshold range, and determining that the switching tube of the first phase bridge arm or the third phase bridge arm fails;

or, in a three-phase charging mode, controlling a second end of a seventh switch to be connected with the twelfth stationary contact and controlling a second end of the sixth switch to be connected with the ninth stationary contact, obtaining a bus voltage at two ends of the third capacitor, wherein the bus voltage is within a bus voltage threshold range, determining that the switching tubes of the second phase bridge arm and the third phase bridge arm are both normal, or determining that the switching tube of the second phase bridge arm or the third phase bridge arm is failed when the bus voltage exceeds the bus voltage threshold range.

12. The charging device according to claim 10, wherein the control module is configured to, when controlling the switch states of the switch modules according to a charging mode and performing fault detection and fault location on the three-phase bridge arm of the PFC circuit module according to the bus voltage, specifically, when performing a single-phase charging mode,

controlling a second end of the seventh switch to be connected with the twelfth stationary contact, and controlling a second end of the fifth switch to be connected with the seventh stationary contact, so as to obtain a bus voltage at two ends of the third capacitor, wherein the bus voltage is within a bus voltage threshold range, and determining that the switching tubes of the first phase bridge arm and the third phase bridge arm are normal, or determining that the switching tubes of the first phase bridge arm or the third phase bridge arm are in fault when the bus voltage exceeds the bus voltage threshold range;

or controlling the second end of the seventh switch to be connected with the twelfth stationary contact and controlling the second end of the sixth switch to be connected with the tenth stationary contact, so as to obtain a bus voltage at two ends of the third capacitor, wherein the bus voltage is within a bus voltage threshold range, and determining that the switching tubes of the second phase bridge arm and the third phase bridge arm are both normal, or determining that the switching tubes of the second phase bridge arm or the third phase bridge arm are in fault when the bus voltage exceeds the bus voltage threshold range.

13. A charging arrangement as claimed in claim 11 or 12, in which the control module is also adapted to,

when the switching tubes of the first phase bridge arm and the third phase bridge arm are normal and the switching tubes of the second phase bridge arm and the third phase bridge arm are determined to be normal, determining that the PFC circuit module is normal;

or when the switching tubes of the first phase bridge arm and the third phase bridge arm are normal and the switching tubes of the second phase bridge arm or the third phase bridge arm are determined to be in fault, determining that the second phase bridge arm is in fault;

or when the switching tubes of the first phase bridge arm or the third phase bridge arm have faults and the switching tubes of the second phase bridge arm and the third phase bridge arm are determined to be normal, determining that the first phase bridge arm has faults;

or when the switching tubes of the first phase bridge arm or the third phase bridge arm have faults and the switching tubes of the second phase bridge arm or the third phase bridge arm have faults, determining that all the three phase bridge arms have faults or determining that the third phase bridge arm has faults.

14. A charging arrangement as claimed in claim 11 or 12, in which the control module is also adapted to,

controlling a second end of the seventh switch to be suspended and a second end of the fifth switch to be suspended, and starting the first direct current conversion module to discharge bus voltage at two ends of the third capacitor;

or controlling the second end of the seventh switch to be suspended and the second end of the sixth switch to be suspended, and starting the first direct current conversion module to discharge the bus voltage at the two ends of the third capacitor.

15. A charging arrangement as claimed in claim 11 or 12, in which the control module is also adapted to,

when the third phase bridge arm fails or both the first phase bridge arm and the second phase bridge arm fail, controlling the second end of the first switch, the second end of the second switch and the second end of the third switch to be suspended so as to stop charging;

or when the first phase bridge arm or the second phase bridge arm fails, controlling the second end of the third switch to be connected with the twelfth stationary contact, controlling the second end of the switch connected with the failed bridge arm of the first phase bridge arm and the second phase bridge arm to be suspended, and controlling the PFC circuit module to operate in a single-phase charging mode.

16. The charging device of claim 2, further comprising:

and the input end of the second direct current conversion module is connected with the power battery, and the output end of the second direct current conversion module is connected with the storage battery and used for converting the output voltage of the power battery into the voltage required by the storage battery.

17. A vehicle, characterized by comprising:

a power cell and a storage battery;

the charging device of any one of claims 1-16, wherein the charging device is connected to the power battery and the storage battery respectively, and is used for charging the power battery and the storage battery.