Charging control method, system, and vehicle

Abstract

A charging control method, system, and vehicle are disclosed, the method including the steps of: acquiring phase voltages and line voltages of any two of M-phase first terminals when a first end of a switch circuit (102) is connected to an external power source (105); determining a power supply mode of the external power source (105) based on the phase voltages and the line voltages; and controlling the switch circuit (102) and the charging circuit (103) to charge the target battery (106) based on the power supply mode.

Description

[Technical Field]

[0001] (Reference to related applications) This disclosure claims priority to a Chinese patent application bearing application number 202111276297.0 and entitled "Charging Control Method, System and Vehicle," filed with the State Intellectual Property Office of the People's Republic of China on October 29, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of charging, and more particularly to a charging control method, system, and vehicle. [Background technology]

[0003] In recent years, with the continuous development of new energy technologies, more and more new energy vehicles have been adopted in society and homes, bringing great convenience to people's travel. To improve vehicle charging efficiency, the on-board charging control system of a new energy vehicle can support charging the vehicle with a three-phase power source. To accommodate single-phase power sources, the on-board charging control system also needs to support charging the vehicle with a single-phase power source. To accommodate both three-phase and single-phase power sources, the charging control system needs to identify the power source mode. However, in related art, the charging control system may encounter power source mode identification errors, which affect the vehicle charging efficiency and ultimately lead to charging failure. Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide a charging control method, system, and vehicle to solve the above problems existing in the related art. [Means for solving the problem]

[0005] In order to achieve the above object, a charge control method according to a first aspect of the present disclosure is applied to a controller in a charge control system, the charge control system including a controller, a switch circuit, and a charging circuit, a first terminal of the switch circuit is connected to an external power supply, a second terminal of the switch circuit is connected to a first terminal of the charging circuit, the second terminal of the charging circuit is connected to a target battery to be charged, the controller is connected to the switch circuit and the charging circuit, the first terminal of the switch circuit includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power supply, and the method includes: acquiring phase voltages and line voltages of any two of the M-phase first terminals when a first end of the switch circuit is connected to the external power supply; determining a power supply mode of the external power supply based on the phase voltages and the line voltages; and controlling the switch circuit and the charging circuit to charge the target battery based on the power supply mode.

[0006] Preferably, the M-phase first terminal includes a three-phase first terminal, and a power supply mode of the external power supply includes a single-phase power supply mode and a three-phase power supply mode, and the step of determining the power supply mode of the external power supply based on the phase voltages and the line voltages includes: determining that the power supply mode of the external power supply is a single-phase power supply mode if the phase voltage is equal to or greater than the line voltage; or If the phase voltage is less than the line voltage, determining that the voltage mode of the external power supply is a three-phase power supply mode.

[0007] Preferably, the three-phase first terminals include an A phase terminal, a B phase terminal, and a C phase terminal, the second end of the switch circuit includes an A' phase terminal, a B' phase terminal, and a C' phase terminal, the switch circuit further includes a first switch, a second switch, a third switch, a first pre-charge resistor, a second pre-charge resistor, and a third pre-charge resistor, the first switch connects the A phase terminal and the A' phase terminal, the second switch connects the B phase terminal and the B' phase terminal, the third switch connects the C phase terminal and the C' phase terminal, the first pre-charge resistor is connected in parallel to the first switch, the second pre-charge resistor is connected in parallel to the second switch, and the third pre-charge resistor is connected in parallel to the third switch, the step of controlling the switch circuit and the charging circuit to charge the target battery based on the power supply mode, If the power supply mode is a three-phase power supply mode, obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit; and when the first differential value is less than or equal to a first voltage threshold, controlling the first switch, the second switch, and the third switch to be all turned on, and controlling the charging circuit to charge the target battery according to a three-phase charging mode.

[0008] Preferably, the switch circuit further includes a fourth switch, the fourth switch connects the A phase terminal and the B phase terminal, and the step of controlling the switch circuit and the charging circuit to charge the target battery based on the power supply mode includes: If the power supply mode is a single-phase power supply mode, obtaining a second difference value between the phase voltage and a second bus voltage of the charging circuit; If the second difference value is less than or equal to a second voltage threshold, controlling the first switch, the second switch, and the fourth switch to be all turned on and the third switch to be off, and controlling the charging circuit to charge the target battery according to a single-phase charging mode.

[0009] Preferably, the method comprises: controlling the first switch, the second switch, the third switch, and the fourth switch to be all turned off when controlling the charging circuit to charge the target battery according to the single-phase charging mode has finished; acquiring a third voltage at the A phase terminal and a fourth voltage at the B' phase terminal; determining that a short circuit fault exists in the fourth switch if the third voltage is greater than or equal to a third voltage threshold and the fourth voltage is greater than or equal to a fourth voltage threshold.

[0010] Preferably, the charging circuit includes a power factor correction circuit and an inverter circuit, a second terminal of the switch circuit is connected to a first terminal of the power factor correction circuit, a second terminal of the power factor correction circuit is connected to a first terminal of the inverter circuit, and a second terminal of the inverter circuit is connected to the target battery, and the method includes: When control of the charging circuit to charge the target battery in accordance with the single-phase charging mode has finished, controlling the first switch, the second switch, the third switch, and the fourth switch to turn them all off, and controlling the external power supply to stop power supply; a step of inversely converting the DC voltage of the target battery into a single-phase voltage by the inverter circuit and the power factor correction circuit and transmitting the single-phase voltage to the A-phase terminal; acquiring a fifth voltage at the A-phase terminal and a sixth voltage at the B-phase terminal; determining that a short circuit fault exists in the fourth switch if the fifth voltage is greater than or equal to a fifth voltage threshold and the sixth voltage is greater than or equal to a sixth voltage threshold.

[0011] In a second aspect, a charge control system according to the present disclosure includes a controller, a switch circuit, and a charging circuit, a first terminal of the switch circuit is connected to an external power supply, a second terminal of the switch circuit is connected to a first terminal of the charging circuit, and the second terminal of the charging circuit is connected to a target battery to be charged, the controller is connected to the switch circuit and the charging circuit, the first terminal of the switch circuit includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power supply, and the controller: acquiring phase voltages and line voltages of any two of the M-phase first terminals when a first end of the switch circuit is connected to the external power supply; determining a power supply mode of the external power supply based on the phase voltages and the line voltages; and controlling the switch circuit and the charging circuit to charge the target battery based on the power supply mode.

[0012] Preferably, the M-phase first terminal includes a three-phase first terminal, and the controller: determining that the power supply mode of the external power supply is a single-phase power supply mode if the phase voltage is equal to or greater than the line voltage; or If the phase voltage is smaller than the line voltage, determining that the voltage mode of the external power supply is a three-phase power supply mode is performed.

[0013] Preferably, the three-phase first terminals include an A phase terminal, a B phase terminal, and a C phase terminal, the second end of the switch circuit includes an A' phase terminal, a B' phase terminal, and a C' phase terminal, the switch circuit further includes a first switch, a second switch, a third switch, a first pre-charge resistor, a second pre-charge resistor, and a third pre-charge resistor, the first switch connects the A phase terminal and the A' phase terminal, the second switch connects the B phase terminal and the B' phase terminal, the third switch connects the C phase terminal and the C' phase terminal, the first pre-charge resistor is connected in parallel to the first switch, the second pre-charge resistor is connected in parallel to the second switch, and the third pre-charge resistor is connected in parallel to the third switch, The controller If the power supply mode is a three-phase power supply mode, obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit; If the first difference value is less than or equal to a first voltage threshold, control the first switch, the second switch, and the third switch to be all turned on, and control the charging circuit to charge the target battery according to a three-phase charging mode.

[0014] Preferably, the switch circuit further includes a fourth switch, the fourth switch connecting the A phase terminal and the B phase terminal, and the controller If the power supply mode is a single-phase power supply mode, obtaining a second difference value between the phase voltage and a second bus voltage of the charging circuit; If the second difference value is less than or equal to a second voltage threshold, control the first switch, the second switch, and the fourth switch to be all turned on, control the third switch to be off, and control the charging circuit to charge the target battery according to a single-phase charging mode.

[0015] Preferably, the controller further comprises: controlling the first switch, the second switch, the third switch, and the fourth switch to be all turned off when controlling the charging circuit to charge the target battery according to the single-phase charging mode has finished; acquiring a third voltage at the A phase terminal and a fourth voltage at the B' phase terminal; determining that a short circuit fault exists in the fourth switch if the third voltage is greater than or equal to a third voltage threshold and the fourth voltage is greater than or equal to a fourth voltage threshold.

[0016] Preferably, the charging circuit includes a power factor correction circuit and an inverter circuit, a second terminal of the switch circuit is connected to a first terminal of the power factor correction circuit, a second terminal of the power factor correction circuit is connected to a first terminal of the inverter circuit, and a second terminal of the inverter circuit is connected to the target battery, and the controller further comprises: When control of the charging circuit to charge the target battery in accordance with the single-phase charging mode has finished, controlling the first switch, the second switch, the third switch, and the fourth switch to turn them all off, and controlling the external power supply to stop power supply; a step of inversely converting the DC voltage of the target battery into a single-phase voltage by the inverter circuit and the power factor correction circuit and transmitting the single-phase voltage to the A-phase terminal; acquiring a fifth voltage at the A-phase terminal and a sixth voltage at the B-phase terminal; determining that a short circuit fault exists in the fourth switch if the fifth voltage is greater than or equal to a fifth voltage threshold and the sixth voltage is greater than or equal to a sixth voltage threshold.

[0017] In a third aspect, a vehicle according to the present disclosure includes the charging control system according to the second aspect of the present disclosure.

[0018] Using the above technical means, when the first end of the switch circuit is connected to the external power supply, the phase voltages and line voltages of any two of the M-phase first terminals are obtained, the power supply mode of the external power supply is determined based on the phase voltages and line voltages, and the switch circuit and the charging circuit are controlled to charge the target battery based on the power supply mode. In this way, by determining the power supply mode of the external power supply by combining the phase voltages and line voltages, the accuracy of power supply mode identification is improved and the problem of power supply mode identification errors can be avoided, which can also prevent reduced charging efficiency or charging failure due to power supply mode identification errors.

[0019] Other features and advantages of the present disclosure are described in detail in the specific embodiments that follow. [Brief explanation of the drawings]

[0020] The drawings are intended to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the following specific embodiments illustrate, but do not limit, the disclosure.

[0021] [Figure 1] 1 is a block diagram of a charging control system according to an embodiment of the present disclosure. [Figure 2] FIG. 10 is a block diagram of another charging control system according to an embodiment of the present disclosure. [Figure 3] FIG. 10 is a block diagram of another charging control system according to an embodiment of the present disclosure. [Figure 4] 1 is a flowchart of a charge control method according to an embodiment of the present disclosure. [Figure 5] FIG. 1 is a block diagram of a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0022] Specific embodiments of the present disclosure will be described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are merely for the purpose of illustrating and interpreting the present disclosure, and are not intended to limit the present disclosure.

[0023] It should be noted that in this disclosure, the terms "first," "second," etc. are used merely for distinguishing purposes of description and should not be understood as indicating or suggesting relative importance, nor as indicating or suggesting an order. The terms "S101," "S102," "S201," "S202," etc. are used to distinguish steps and should not be understood as necessarily performing method steps in a particular order or sequential order. When the following description refers to drawings, the same numerals in different drawings indicate the same or similar elements unless otherwise stated.

[0024] First, the application scenario of the present disclosure will be described. The present disclosure can be applied to charging scenarios, particularly scenarios in which a new energy vehicle uses AC power to charge its power battery. To improve vehicle charging efficiency, the on-board charging control system of the new energy vehicle can charge the power battery using a three-phase power source or a single-phase power source by identifying the power mode of the external power source.

[0025] FIG. 1 is a block diagram of a charging control system according to an embodiment of the present disclosure. As shown in FIG. 1, the charging control system may include a controller 101, a switch circuit 102, and a charging circuit 103. A first terminal of the switch circuit 102 is connected to an external power source 105, a second terminal of the switch circuit 102 is connected to a first terminal of the charging circuit 103, and a second terminal of the charging circuit 103 is connected to a target battery 106 to be charged. The controller 101 is connected to the switch circuit 102 and the charging circuit 103. The first terminal of the switch circuit 103 includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power source.

[0026] In the related art, a charging control system can identify a power supply mode based on the phase voltage detected at the M-phase first terminal. For example, when M is 3, if the phase voltages detected at the three-phase first terminals are all greater than a certain voltage threshold, it can determine that the power supply mode of the external power supply is a three-phase power supply mode. However, because the charging circuit 103 may have a capacitor for voltage stabilization or filtering, the detected phase voltages may not match the input of the external power supply due to the effect of the capacitor. For example, if the external power supply is a single-phase power supply, a voltage is input to only phase A, but due to the effect of the capacitor, non-zero voltages are detected in the other two phases, leading to an error in identifying the power supply mode.

[0027] To solve the above problems, the charging control method, system, and vehicle disclosed herein acquire phase voltages and line voltages, and identify the power supply mode of the external power supply by determining the combination of the phase voltages and line voltages. This improves the accuracy of power supply mode identification, and avoids the problem of power supply mode identification errors, thereby also avoiding the problem of reduced charging efficiency or inability to charge due to power supply mode identification errors.

[0028] Specific embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0029] As shown in FIG. 1, a controller 101 in a charging control system according to an embodiment of the present disclosure includes: When the first end of the switch circuit is connected to the external power supply, the following steps may be performed: acquiring phase voltages and line voltages of any two of the M phase first terminals; determining a power supply mode of the external power supply based on the phase voltages and line voltages; and controlling the switch circuit and the charging circuit to charge the target battery based on the power supply mode.

[0030] Exemplarily, the controller can obtain a voltage value between any of the M-phase first terminals of the switch circuit shown in FIG. 1 and zero line, and set the voltage value as a phase voltage corresponding to the first terminal. For example, the M-phase first terminals may include at least a first-phase first terminal and a second-phase first terminal, and the controller can obtain a first-phase voltage of the first-phase first terminal and a second-phase voltage of the second-phase first terminal, and set a difference value between the first phase voltage and the second phase voltage as a line voltage.

[0031] If the phase voltages of the M-phase first terminals are all equal to or less than a predetermined minimum voltage, for example, 0, it can be determined that the first terminal of the switch circuit is not connected to the external power supply, and if the phase voltage of any one of the M-phase first terminals is greater than the predetermined minimum voltage, it can be determined that the first terminal of the switch circuit is connected to the external power supply. The predetermined minimum voltage can be any predetermined voltage, for example, 10 V or 220 V.

[0032] In another embodiment of the present disclosure, the M-phase first terminal includes a three-phase first terminal, and the power supply mode of the external power supply includes a single-phase power supply mode and a three-phase power supply mode, and the controller: If the phase voltage is equal to or greater than the line voltage, determining that a power supply mode of the external power source is a single-phase power supply mode, and if the power supply mode is the single-phase power supply mode, controlling the charging circuit to charge the target battery according to a single-phase charging mode, which may include a single-phase alternating charging mode or a single-phase non-alternating charging mode.

[0033] Alternatively, the method may perform the steps of: determining that the voltage mode of the external power source is a three-phase power source mode if the phase voltage is less than the line voltage; and, if the power source mode is a three-phase power source mode, controlling the charging circuit to charge the target battery according to a three-phase charging mode.

[0034] Note that, when the power supply mode of the external power supply is three-phase power supply mode, theoretically, the instantaneous values ​​of the phase voltages at the three-phase first terminals are vectors with the same amplitude but a phase difference of 120 degrees, and therefore the effective values ​​of the phase voltages at the three-phase first terminals are approximately equal, and the effective values ​​of the line voltages between each of the two phase first terminals are also approximately equal, with the line voltage being approximately 1.414 times the phase voltage.

[0035] When the power supply mode of the external power supply is single-phase, theoretically, only the phase voltage at one phase first terminal (e.g., the first phase first terminal) is greater than zero, and the phase voltages at the other two phase first terminals are all zero (e.g., the first phase voltage at the first phase first terminal is greater than zero, and the second phase voltage at the second phase first terminal and the third phase voltage at the third phase first terminal are all theoretically zero). However, in an actual charging control system, the charging circuit includes capacitor X for voltage stabilization or filtering, so the other second and third phase voltages are also greater than zero even in single-phase power supply mode. Therefore, determining the power supply mode of the external power supply based solely on whether the three phase voltages are zero is likely to result in an erroneous determination. The inventors discovered that in single-phase power supply mode, the second and third phase voltages due to capacitor X are in phase with the first phase voltage, i.e., there is no 120-degree phase difference as in the three-phase power supply mode. Therefore, the phase voltages obtained in single-phase power supply mode are greater than the line voltages. Based on the above analysis, the phase voltages in three-phase power supply mode are less than the line voltages. Therefore, by using the above method, the power supply mode of the external power supply can be accurately obtained based on the phase voltage and the line voltage.

[0036] In this way, when the first end of the switch circuit is connected to the external power supply, the system obtains the phase voltages and line voltages of any two of the M-phase first terminals, determines the power supply mode of the external power supply based on the phase voltages and line voltages, and controls the switch circuit and the charging circuit to charge the target battery based on the power supply mode. By identifying the power supply mode of the external power supply by determining a combination of the phase voltages and line voltages, the accuracy of power supply mode identification is improved, and problems such as reduced charging efficiency or inability to charge due to power supply mode identification errors can be avoided.

[0037] FIG. 2 is a block diagram of another charge control system according to an embodiment of the present disclosure. As shown in FIG. 2 , the M-phase first terminal includes a three-phase first terminal, a power supply mode of the external power supply includes a single-phase power supply mode and a three-phase power supply mode, and the three-phase first terminal may include an A-phase terminal, a B-phase terminal, and a C-phase terminal. A second end of the switch circuit includes an A'-phase terminal, a B'-phase terminal, and a C'-phase terminal. The switch circuit may further include a first switch S1, a second switch S2, and a third switch S3, where the first switch connects the A-phase terminal and the A'-phase terminal, the second switch connects the B-phase terminal and the B'-phase terminal, and the third switch connects the C-phase terminal and the C'-phase terminal. The switch circuit may further include a first pre-charge resistor Rx1, a second pre-charge resistor Rx2, and a third pre-charge resistor Rx3. The first pre-charge resistor Rx1 is connected in parallel to the first switch S1, the second pre-charge resistor Rx2 is connected in parallel to the second switch S2, and the third pre-charge resistor Rx3 is connected in parallel to the third switch S3, and the first terminal of the charging circuit 103 may be connected to the zero line connection port LN of the external power supply.

[0038] The controller If the power supply mode is a three-phase power supply mode, the method may perform the steps of obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit, and if the first difference value is less than or equal to a first voltage threshold, controlling the first switch, the second switch, and the third switch to be all on, and controlling the charging circuit to charge the target battery according to a three-phase charging mode.

[0039] The first voltage threshold may be 0 or a smaller voltage value (eg, 2V or 10V).

[0040] The first switch, second switch, and third switch of the charging control system are in the off state by default. In this way, when charging starts, all of the switches are in the off state, and the target battery is precharged by the first precharge resistor, second precharge resistor, and third precharge resistor, which prevents damage to internal components of the charging control system due to an initial charging voltage that is too high, and improves the reliability of the charging control system.

[0041] Furthermore, as shown in FIG. 2, the switch circuit may further include a fourth switch S4, which connects the A phase terminal and the B phase terminal, and the controller may further: If the power supply mode is a single-phase power supply mode, obtaining a second difference value between the phase voltage and a second bus voltage of the charging circuit; If the second difference value is less than or equal to a second voltage threshold, controlling the first switch, the second switch, and the fourth switch to be all on, controlling the third switch to be off, and controlling the charging circuit to charge the target battery according to a single-phase charging mode may be performed.

[0042] 3 is a block diagram of another charging control system according to an embodiment of the present disclosure. As shown in FIG. 3, the charging circuit 103 may include a power factor correction circuit 1031 and an inverter circuit 1032. The power factor correction circuit may include a three-phase first bridge arm and a one-phase second bridge arm. The first-phase first bridge arm may be formed by connecting switch transistors Q1 and Q2 in series. The second-phase first bridge arm may be formed by connecting switch transistors Q3 and Q4 in series. The third-phase first bridge arm may be formed by connecting switch transistors Q5 and Q6 in series. The second bridge arm may be formed by connecting switch transistors Q7 and Q8 in series. The switch transistors Q1 to Q8 may be IGBTs or MOS transistors.

[0043] The power factor correction circuit 1031 converts AC power input from an external power source into DC power and transmits the DC power to the inverter circuit 1032, thereby charging the target battery.

[0044] For example, the step of controlling the charging circuit to charge the target battery in accordance with the three-phase charging mode may include the step of controlling, based on the phase of an external three-phase power supply, switch transistors Q1 and Q2 to be complementarily conductive, switch transistors Q3 and Q4 to be complementarily conductive, switch transistors Q5 and Q6 to be complementarily conductive, switch transistor Q7 to be in an on state, and switch transistor Q8 to be in an off state, thereby converting three-phase AC power input from an external power supply into DC power and transmitting the DC power to the inverter circuit.

[0045] Furthermore, for example, the step of controlling the charging circuit to charge the target battery in accordance with a single-phase alternating charging mode may include the step of controlling switch transistors Q5 / Q6 so that they are all in an off state, and controlling switch transistors Q1 and Q2 to be complementarily conductive, switch transistors Q3 and Q4 to be complementarily conductive, and switch transistors Q7 and Q8 to be complementarily conductive based on the phase of the external power supply, thereby converting AC power input from the external power supply into DC power and transmitting the DC power to the inverter circuit.

[0046] Furthermore, for example, the step of controlling the charging circuit to charge the target battery in accordance with a single-phase non-alternating charging mode may include the step of controlling switch transistors Q3 / Q4 / Q5 / Q6 to be all in an off state, and controlling switch transistors Q1 and Q2 to be complementarily conductive and switch transistors Q7 and Q8 to be complementarily conductive based on the phase of the external power supply, thereby converting single-phase AC power input from the external power supply into DC power and transmitting the DC power to the inverter circuit.

[0047] In this way, the normal bridge arm and the second bridge arm of the three-phase first bridge arm can convert AC power input from an external power source into DC power according to different modes and transmit the DC power to the inverter circuit, which can then charge the target battery.

[0048] 3, the charging circuit 103 may further include a first inductor L11, a second inductor L12, a third inductor L13, and a fourth inductor L14, and the midpoint of the first-phase first bridge arm may be connected to the A'-phase terminal of the second end of the switch circuit via the first inductor L11, the midpoint of the second-phase first bridge arm may be connected to the B'-phase terminal of the second end of the switch circuit via the second inductor L12, the midpoint of the third-phase first bridge arm may be connected to the C'-phase terminal of the second end of the switch circuit via the third inductor L13, and the midpoint of the second bridge arm may be connected to the zero line connection port LN of the external power supply via the fourth inductor L14.

[0049] Preferably, the charging control system may further include a first voltage stabilizing capacitor Cx1, a second voltage stabilizing capacitor Cx2, and a third voltage stabilizing capacitor Cx3, where the first voltage stabilizing capacitor Cx1 connects the A-phase terminal and the N-phase terminal, the second voltage stabilizing capacitor Cx2 connects the B-phase terminal and the N-phase terminal, and the third voltage stabilizing capacitor Cx3 connects the C-phase terminal and the N-phase terminal. In this way, the three voltage stabilizing capacitors filter the voltage input from the external power source, prevent damage to devices in the charging control system due to voltage fluctuations, and improve the reliability of the charging control system.

[0050] 3, the inverter circuit 1032 may include a transformer, the low-voltage side of which is connected to a first full-bridge switch circuit, and the high-voltage side of which is connected to a second full-bridge switch circuit, the first full-bridge switch circuit including two bridge arms formed by switch transistors Q9-Q12, and the second full-bridge switch circuit including two bridge arms formed by switch transistors Q13-Q16, the switch transistors Q9-Q12 being synchronous rectifier tubes, and the switch transistors Q13-Q16 including the switch transistors Q13 and Q14 being complementary-conducting at variable frequencies, and the switch transistors Q15 and Q16 being complementary-conducting at variable frequencies. When the vehicle is in charging mode, the inverter circuit can convert the DC power provided by the power factor correction circuit to high voltage to charge the vehicle's power battery.

[0051] Furthermore, a first capacitor C1 and a first resistor R1 may be connected between the power factor correction circuit 1031 and the inverter circuit 1032, and the first capacitor C1 and the first resistor R1 may filter and stabilize the DC power output from the power factor correction circuit. Similarly, a second capacitor C2 may be connected between the inverter circuit 1032 and the target battery, and the second capacitor C2 may filter and stabilize the voltage output from the inverter circuit.

[0052] After the charging control system finishes single-phase charging, the fourth switch S4 needs to be turned off. However, if a fault occurs in the fourth switch S4, for example, if the current is too large and the fourth switch S4 is closed (i.e., short-circuited), and a short-circuit fault occurs in the fourth switch, when charging again in a three-phase power supply mode, two live connection ports of the external power supply (e.g., the two live connection ports L1 and L2 in FIG. 3) will be short-circuited by the fourth switch, causing a fault in the external power supply. Therefore, in another embodiment of the present disclosure, the controller can also detect the fourth switch using the following method 1 or method 2 to determine whether a short-circuit fault exists in the fourth switch.

[0053] In method 1, when the charging circuit is controlled to charge the target battery in a single-phase charging mode, the first switch, the second switch, the third switch, and the fourth switch are all controlled to be turned off, and a third voltage at the A phase terminal and a fourth voltage at the B' phase terminal are obtained. If the third voltage is greater than or equal to a third voltage threshold and the fourth voltage is greater than or equal to a fourth voltage threshold, it is determined that a short-circuit fault exists in the fourth switch.

[0054] In this method, after single-phase charging is completed, the external power source may still be conductive, i.e., current may still be input to the external power source. Thus, an electrical state is still maintained at the A phase terminal. Therefore, the third voltage at the A phase terminal may be equal to or greater than the third voltage threshold. When the fourth switch is normally turned off, the current at the B phase terminal and the B' phase terminal also disappears. When a short-circuit fault occurs in the fourth switch, i.e., when the controller controls the fourth switch to be turned off but the fourth switch is still in a short-circuit state, due to the existence of the charging circuit, the current flow direction is from the first live line connection port L1 of the external power source to the A phase port of the switch circuit to the shorted fourth switch to the second pre-charge resistor Rs2 of the switch circuit to the B' phase terminal of the switch circuit, and a certain voltage (e.g., equal to or greater than the fourth voltage threshold) exists at the B' phase terminal. The third and fourth voltage thresholds may be preset based on the voltage of an external power source, and the fourth voltage threshold may be smaller than the third voltage threshold. For example, the third voltage threshold may be 220V or 380V, and the fourth voltage threshold may be 200V or 360V.

[0055] In method 2, when the control of the charging circuit to charge the target battery in accordance with the single-phase charging mode is completed, the first switch, the second switch, the third switch, and the fourth switch are controlled to be all turned off, and the external power supply is controlled to stop power supply, and the inverter circuit and the power factor correction circuit inversely convert the DC voltage of the target battery to a single-phase voltage and transmit the single-phase voltage to the A-phase terminal, and obtain a fifth voltage at the A-phase terminal and a sixth voltage at the B-phase terminal, and if the fifth voltage is equal to or greater than a fifth voltage threshold and the sixth voltage is equal to or greater than a sixth voltage threshold, it is determined that a short-circuit fault exists in the fourth switch.

[0056] For example, the external power source may be a charging pile, and the charging circuit may send a message according to a charging pile protocol to control the charging pile to stop power supply (i.e., all of L1, L2, and L3 of the external power source do not output current). To detect whether a short-circuit fault occurs in the fourth switch, an inverter circuit and a power factor correction circuit may inversely convert the DC voltage of the target battery into a single-phase voltage and transmit the single-phase voltage to the A-phase terminal. Similarly, when the fourth switch is normally turned off, there is no current or voltage in the B-phase terminal. When a short-circuit fault occurs in the fourth switch (i.e., when the controller controls the fourth switch to be turned off but the fourth switch remains short-circuited), the current flows from the A'-phase terminal of the switch circuit to the first pre-charge resistor Rs1 of the switch circuit to the A-phase port of the switch circuit to the shorted fourth switch to the B-phase terminal of the switch circuit to the capacitor Cx2, resulting in a certain voltage (e.g., greater than or equal to the sixth voltage threshold) being present in the B-phase terminal. The fifth and sixth voltage thresholds may be preset based on the voltage of the power battery, and the sixth voltage threshold may be lower than the fifth voltage threshold, for example, the fifth voltage threshold may be 220V or 380V, and the sixth voltage threshold may be 200V or 360V.

[0057] In addition, the inverter circuit may be a bidirectional inverter circuit, and may transform the DC power output from the power factor correction circuit before charging the target battery, or may transform the DC power of the target battery before outputting it to the power factor correction circuit.

[0058] After the target battery has been charged in the single-phase charging mode using the above method 1 or 2, it can be detected whether a short circuit fault exists in the fourth switch.

[0059] Furthermore, if a short circuit fault exists in the fourth switch, the controller generates alarm information including the short circuit fault and displays the alarm information on a display device, for example, on an in-vehicle display, or by sound or indicator light, to prompt the user to perform fault handling in the charging circuit. The controller may also record the fault state of the fourth switch, and prohibit charging the target battery in three-phase charging mode during the next charging, and charge the target battery using single-phase charging mode.

[0060] In this way, the reliability of the charging control system can be further improved.

[0061] FIG. 4 illustrates a charging control method according to an embodiment of the present disclosure. As shown in FIG. 4, the method may be performed by a controller in a charging control system. The charging control system may include a controller, a switch circuit, and a charging circuit. A first terminal of the switch circuit is connected to an external power supply, a second terminal of the switch circuit is connected to a first terminal of the charging circuit, and the second terminal of the charging circuit is connected to a target battery to be charged. The controller is connected to the switch circuit and the charging circuit. The first terminal of the switch circuit includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power supply. The method may include S401 to S403.

[0062] In S401, when the first terminal of the switch circuit is connected to the external power supply, the phase voltages and line voltages of any two phase first terminals among the M phase first terminals are acquired.

[0063] For example, a voltage value between any of the M-phase first terminals of the switch circuit shown in FIG. 1 and the zero line can be obtained, and the voltage value can be set as the phase voltage corresponding to the first terminal. For example, the M-phase first terminals may include at least a first-phase first terminal and a second-phase first terminal, and a first-phase voltage of the first-phase first terminal and a second-phase voltage of the second-phase first terminal can be obtained, and a difference value between the first-phase voltage and the second-phase voltage can be set as the line voltage.

[0064] If the phase voltages of the M-phase first terminals are all equal to or less than a predetermined minimum voltage, for example, 0, it can be determined that the first terminal of the switch circuit is not connected to the external power supply, and if the phase voltage of any one of the M-phase first terminals is greater than the predetermined minimum voltage, it can be determined that the first terminal of the switch circuit is connected to the external power supply. The predetermined minimum voltage can be any predetermined voltage, for example, 10 V or 220 V.

[0065] In S402, the power supply mode of the external power supply is determined based on the phase voltage and the line voltage.

[0066] In S403, the switch circuit and the charging circuit are controlled to charge the target battery based on the power supply mode.

[0067] For example, if the phase voltage is equal to or greater than the line voltage, it can be determined that the power supply mode of the external power source is a single-phase power supply mode, and if the power supply mode is a single-phase power supply mode, the charging circuit can be controlled to charge the target battery according to a single-phase alternating charging mode.

[0068] Furthermore, for example, if the phase voltage is smaller than the line voltage, it can be determined that the voltage mode of the external power supply is a three-phase power supply mode, and if the power supply mode is a three-phase power supply mode, the charging circuit can be controlled to charge the target battery according to a three-phase charging mode.

[0069] When the first end of the switch circuit is connected to the external power supply, the phase voltages and line voltages of any two of the M-phase first terminals are obtained, and the power supply mode of the external power supply is determined based on the phase voltages and line voltages. The switch circuit and the charging circuit are controlled to charge the target battery based on the determined power supply mode. By identifying the power supply mode of the external power supply through a combination of the phase voltages and line voltages, the accuracy of power supply mode identification is improved, and power supply mode identification errors can be avoided, resulting in reduced charging efficiency or inability to charge.

[0070] In another embodiment of the present disclosure, the three-phase first terminals include an A phase terminal, a B phase terminal, and a C phase terminal, a second end of the switch circuit includes an A′ phase terminal, a B′ phase terminal, and a C′ phase terminal, the switch circuit further includes a first switch, a second switch, a third switch, a first pre-charge resistor, a second pre-charge resistor, and a third pre-charge resistor, the first switch connecting the A phase terminal and the A′ phase terminal, the second switch connecting the B phase terminal and the B′ phase terminal, the third switch connecting the C phase terminal and the C′ phase terminal, the first pre-charge resistor connected in parallel with the first switch, the second pre-charge resistor connected in parallel with the second switch, and the third pre-charge resistor connected in parallel with the third switch; In this way, step S403 is First, when the power supply mode is a three-phase power supply mode, obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit; Next, if the first difference value is less than or equal to a first voltage threshold, controlling the first switch, the second switch, and the third switch to be all turned on, and controlling the charging circuit to charge the target battery according to a three-phase charging mode.

[0071] Furthermore, the switch circuit further includes a fourth switch, which connects the A-phase terminal and the B-phase terminal. Thus, the above step S403 can be First, when the power supply mode is a single-phase power supply mode, obtaining a second difference value between the phase voltage and a second bus voltage of the charging circuit; Next, if the second difference value is less than or equal to a second voltage threshold, controlling the first switch, the second switch, and the fourth switch to be all turned on and the third switch to be turned off, and controlling the charging circuit to charge the target battery according to a single-phase charging mode.

[0072] After the charging control system finishes single-phase charging, the fourth switch S4 needs to be turned off. However, the fourth switch S4 may fail under certain circumstances, for example, the current may be too large and the fourth switch may be closed (i.e., short-circuited). If a short-circuit fault occurs in the fourth switch, when charging again in a three-phase power supply mode, two live connection ports of the external power supply (e.g., the two live connection ports L1 and L2 in FIG. 3) may be short-circuited by the fourth switch, causing a fault in the external power supply. Therefore, in another embodiment of the present disclosure, the charging control method may also detect the fourth switch using the following method 1 or method 2 to determine whether a short-circuit fault exists in the fourth switch.

[0073] In method 1, when the charging circuit is controlled to charge the target battery in a single-phase charging mode, the first switch, the second switch, the third switch, and the fourth switch are all controlled to be turned off, and a third voltage at the A phase terminal and a fourth voltage at the B' phase terminal are obtained. If the third voltage is greater than or equal to a third voltage threshold and the fourth voltage is greater than or equal to a fourth voltage threshold, it is determined that a short-circuit fault exists in the fourth switch.

[0074] In method 2, when the control of the charging circuit to charge the target battery in accordance with the single-phase charging mode is completed, the first switch, the second switch, the third switch, and the fourth switch are controlled to be all turned off, and the external power supply is controlled to stop power supply, and the inverter circuit and the power factor correction circuit inversely convert the DC voltage of the target battery to a single-phase voltage and transmit the single-phase voltage to the A-phase terminal, and obtain a fifth voltage at the A-phase terminal and a sixth voltage at the B-phase terminal, and if the fifth voltage is equal to or greater than a fifth voltage threshold and the sixth voltage is equal to or greater than a sixth voltage threshold, it is determined that a short-circuit fault exists in the fourth switch.

[0075] Furthermore, if a short circuit fault exists in the fourth switch, the controller generates alarm information including the short circuit fault and displays the alarm information on a display device, for example, on an in-vehicle display, or by sound or indicator light, to prompt the user to perform fault handling in the charging circuit. The controller may also record the fault state of the fourth switch, and prohibit charging the target battery in three-phase charging mode during the next charging, and charge the target battery using single-phase charging mode.

[0076] In this way, the reliability of the charging control system can be further improved.

[0077] For the specific implementation of each step in the above method embodiment, please refer to the detailed description in the above charging control system embodiment, and detailed description will be omitted here.

[0078] FIG. 5 is a block diagram of a vehicle according to an embodiment of the present disclosure. As shown in FIG. 5, the vehicle includes the charging control system 100 described above.

[0079] Although preferred embodiments of the present disclosure have been described in detail above with reference to the drawings, the present disclosure is not limited to the specific contents of the above embodiments, and multiple simple modifications can be made to the technical means of the present disclosure within the scope of the technical idea of ​​the present disclosure, and all of these simple modifications fall within the scope of protection of the present disclosure.

[0080] It should be noted that the specific technical features described in the above specific embodiments can be combined in any suitable manner if not contradictory, and in order to avoid unnecessary duplication, the present disclosure does not separately describe every possible combination manner.

[0081] Furthermore, the various embodiments of the present disclosure can be combined in any manner, and should be considered as being disclosed in the present disclosure unless they deviate from the spirit of the present disclosure.

Claims

1. A charge control method is applied to a controller (101) in a charge control system (100), the charge control system (100) including a controller (101), a switch circuit (102), and a charging circuit (103), a first terminal of the switch circuit (102) is connected to an external power source (105), a second terminal of the switch circuit (102) is connected to a first terminal of the charging circuit (103), and a second terminal of the charging circuit (103) is connected to a target battery (106) to be charged, the controller (101) is connected to the switch circuit (102) and the charging circuit (103), the first terminal of the switch circuit (102) includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power source (105), the method comprising: When a first end of the switch circuit (102) is connected to the external power supply (105), acquiring phase voltages and line voltages of any two of the M-phase first terminals; determining a power supply mode of the external power supply (105) based on the phase voltage and the line voltage; and controlling the switch circuit (102) and the charging circuit (103) based on the power supply mode to charge the target battery (106); the M-phase first terminal includes a three-phase first terminal, and a power supply mode of the external power supply (105) includes a single-phase power supply mode and a three-phase power supply mode, and the step of determining the power supply mode of the external power supply (105) based on the phase voltages and the line voltages includes: determining that the power supply mode of the external power supply (105) is a single-phase power supply mode if the phase voltage is equal to or greater than the line voltage; and determining that the voltage mode of the external power source (105) is a three-phase power mode if the phase voltage is less than the line voltage; The step of controlling the switch circuit (102) and the charging circuit (103) to charge the target battery (106) based on the power supply mode includes: If the power supply mode is a three-phase power supply mode, obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit (103); and if the first difference value is less than or equal to a first voltage threshold, controlling the charging circuit (103) to charge the target battery (106) according to a three-phase charging mode. A charging control method comprising:

2. The three-phase first terminals include an A-phase terminal, a B-phase terminal, and a C-phase terminal, and the second end of the switch circuit (102) includes an A'-phase terminal, a B'-phase terminal, and a C'-phase terminal, and the switch circuit (102) further includes a first switch (S1), a second switch (S2), a third switch (S3), a first pre-charge resistor (Rs1), a second pre-charge resistor (Rs2), and a third pre-charge resistor (Rs3), and the first switch (S1) is connected to the A-phase terminal and the the second switch (S2) connects the B phase terminal and the B' phase terminal, the third switch (S3) connects the C phase terminal and the C' phase terminal, the first pre-charge resistor (Rs1) is connected in parallel with the first switch (S1), the second pre-charge resistor (Rs2) is connected in parallel with the second switch (S2), and the third pre-charge resistor (Rs3) is connected in parallel with the third switch (S3); The step of controlling the switch circuit (102) and the charging circuit (103) to charge the target battery (106) based on the power supply mode includes: and controlling the first switch (S1), the second switch (S2), and the third switch (S3) to be all turned on when the first difference value is less than or equal to the first voltage threshold, and controlling the charging circuit (103) to charge the target battery (106) according to the three-phase charging mode.

3. The switch circuit (102) further includes a fourth switch (S4), and the fourth switch (S4) connects the A-phase terminal and the B-phase terminal, and the step of controlling the switch circuit (102) and the charging circuit (103) to charge the target battery (106) based on the power supply mode includes: If the power supply mode is a single-phase power supply mode, obtaining a second difference value between the phase voltage and a second bus voltage of the charging circuit (103); 3. The method of claim 2, further comprising: when the second difference value is equal to or less than a second voltage threshold, controlling the first switch (S1), the second switch (S2), and the fourth switch (S4) to be all turned on and controlling the third switch (S3) to be off, and controlling the charging circuit (103) to charge the target battery (106) according to a single-phase charging mode.

4. When control of the charging circuit (103) to charge the target battery (106) according to the single-phase charging mode is completed, controlling the first switch (S1), the second switch (S2), the third switch (S3), and the fourth switch (S4) to turn them all off; acquiring a third voltage at the A-phase terminal and a fourth voltage at the B'-phase terminal; 4. The method of claim 3, further comprising: determining that a short circuit fault exists in the fourth switch (S4) if the third voltage is greater than or equal to a third voltage threshold and the fourth voltage is greater than or equal to a fourth voltage threshold.

5. The charging circuit (103) includes a power factor correction circuit (1031) and an inverter circuit (1032), a second terminal of the switch circuit (102) is connected to a first terminal of the power factor correction circuit (1031), a second terminal of the power factor correction circuit (1031) is connected to a first terminal of the inverter circuit (1032), and a second terminal of the inverter circuit (1032) is connected to the target battery (106), and the method includes: When control of the charging circuit (103) to charge the target battery (106) according to the single-phase charging mode is completed, controlling the first switch (S1), the second switch (S2), the third switch (S3), and the fourth switch (S4) to turn them all off, and controlling the external power source (105) to stop power supply; a step of inversely converting the DC voltage of the target battery (106) into a single-phase voltage by the inverter circuit (1032) and the power factor correction circuit (1031) and transmitting the single-phase voltage to the A-phase terminal; acquiring a fifth voltage at the A-phase terminal and a sixth voltage at the B-phase terminal; and determining that a short circuit fault exists in the fourth switch (S4) if the fifth voltage is greater than or equal to a fifth voltage threshold and the sixth voltage is greater than or equal to a sixth voltage threshold.

6. 5. The method of claim 3 or 4, further comprising the step of, if it is determined that a short circuit fault exists in the fourth switch (S4), recording the fault state of the fourth switch (S4) by the controller (101) and controlling the charging control system (100) to charge the target battery (106) using a single-phase charging mode during a next charging attempt.

7. The battery includes a controller (101), a switch circuit (102), and a charging circuit (103), wherein a first terminal of the switch circuit (102) is connected to an external power source (105), a second terminal of the switch circuit (102) is connected to a first terminal of the charging circuit (103), and a second terminal of the charging circuit (103) is connected to a target battery (106) to be charged, the controller (101) is connected to the switch circuit (102) and the charging circuit (103), the first terminal of the switch circuit (102) includes an M-phase first terminal, and the M-phase first terminal is connected to a live line connection port of the external power source (105), and the controller (101) When a first end of the switch circuit (102) is connected to the external power supply (105), acquiring phase voltages and line voltages of any two of the M-phase first terminals; determining a power supply mode of the external power supply (105) based on the phase voltage and the line voltage; and controlling the switch circuit (102) and the charging circuit (103) based on the power supply mode to charge the target battery (106). The M-phase first terminal includes a three-phase first terminal, and the power supply mode of the external power supply (105) includes a single-phase power supply mode and a three-phase power supply mode, and the controller (101) determining that the power supply mode of the external power supply (105) is a single-phase power supply mode if the phase voltage is equal to or greater than the line voltage; If the phase voltage is less than the line voltage, determining that the voltage mode of the external power source (105) is a three-phase power mode. The controller (101) If the power supply mode is a three-phase power supply mode, obtaining a first difference value between the line voltage and a first bus voltage of the charging circuit (103); if the first difference value is less than or equal to a first voltage threshold, controlling the charging circuit (103) to charge the target battery (106) according to a three-phase charging mode. A charging control system (100).

8. The three-phase first terminals include an A-phase terminal, a B-phase terminal, and a C-phase terminal, and the second end of the switch circuit (102) includes an A'-phase terminal, a B'-phase terminal, and a C'-phase terminal, and the switch circuit (102) further includes a first switch (S1), a second switch (S2), a third switch (S3), a first pre-charge resistor (Rs1), a second pre-charge resistor (Rs2), and a third pre-charge resistor (Rs3), and the first switch (S1) is connected to the A-phase terminal and the the second switch (S2) connects the B phase terminal and the B' phase terminal, the third switch (S3) connects the C phase terminal and the C' phase terminal, the first pre-charge resistor (Rs1) is connected in parallel with the first switch (S1), the second pre-charge resistor (Rs2) is connected in parallel with the second switch (S2), and the third pre-charge resistor (Rs3) is connected in parallel with the third switch (S3); The controller (101) 8. The system of claim 7, further comprising: when the first difference value is equal to or less than the first voltage threshold, controlling the first switch (S1), the second switch (S2), and the third switch (S3) to be all turned on, and controlling the charging circuit (103) to charge the target battery (106) according to the three-phase charging mode.

9. A vehicle comprising a charging control system (100) according to claim 7 or 8.

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