Multifunctional charging circuit topological structure, control method and control device

Abstract

The invention discloses a multifunctional charging circuit topological structure, a control method and a control device. A magnetic device L2 is electrically connected with a power conversion assembly and a direct current charging seat, and a rechargeable battery is electrically connected with the power conversion assembly; during wireless charging, the magnetic device L2 serves as a coupler to be magnetically coupled with a coupler at the ground end through on-off of a switch in the power conversion assembly, the magnetic device L2 is converted into alternating current in the form of an alternating high-frequency electromagnetic field, and the alternating current is rectified into direct current through the power conversion assembly to be input to a rechargeable battery; during boost charging, through conversion control of the power conversion assembly, the magnetic device assembly serves as a boost inductor, and the direct current input by the direct current charging base is boosted and input to a rechargeable battery. The wireless charging system has the advantages that two charging functions, namely wireless charging and direct-current variable-voltage charging, are realized at the same time, additional power devices do not need to be introduced, the utilization rate of a system switch, a controller, a capacitor, a magnetic core device and the like is improved, the use of materials is reduced, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to a multifunctional charging circuit topology structure, a control method and a control device, and belongs to the technical field of power conversion. Background Art

[0002] Wireless charging of electric vehicles can avoid manual operation and greatly improve the convenience of charging. However, wireless charging has a complex structure and high cost.

[0003] In addition, the output of existing wired DC charging piles is mostly around 400V, while the power batteries of electric vehicles are generally using high-voltage batteries of around 800V, resulting in the inability of existing installed charging piles to adapt to new 800V power battery vehicles, resulting in a waste of resources. A potential solution is to introduce a DC-DC converter (boost converter) on the vehicle side to achieve direct voltage matching between the charging pile and the battery.

[0004] However, the existing electric vehicles are equipped with boost converters and wireless chargers at the same time, which is not only costly, but also occupies space in the vehicle and increases the weight of the vehicle. The existing integration technology of boost converters and wireless chargers requires the introduction of at least one additional large-volume power inductor or capacitor or switch to switch the working mode (boost converter and wireless charger mode switching), but as a high-frequency switching power supply circuit, the switch introduced in the circuit is subject to large voltage and current stress, which easily causes reliability problems of the switch, and the switch is usually costly and is not suitable for mass-produced vehicles. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multifunctional charging circuit topology structure, a control method and a control device.

[0006] In order to solve the above technical problems, the present invention provides a multifunctional charging circuit topology structure, including a power conversion component, a magnetic device L2, a DC charging seat and a rechargeable battery; The magnetic device L2 is electrically connected to the power conversion component and the DC charging seat respectively, and the rechargeable battery is electrically connected to the power conversion component; During wireless charging, the switch in the power conversion component is turned on and off, so that the magnetic device L2 acts as a coupler to be magnetically coupled with the coupler at the ground end, and is converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery; During boost charging, the power conversion component is controlled to make the magnetic component act as a boost inductor to boost the DC power input from the DC charging stand and input it to the rechargeable battery.

[0007] Furthermore, it also includes: a capacitor C2, wherein the capacitor C2 is electrically connected to the magnetic device L2, the power conversion component and the DC charging seat respectively; During wireless charging, the capacitor C2 is used as a resonant capacitor to form a resonant unit with the inductance of the magnetic device L2; During boost charging, the capacitor C2 is used as an input filter capacitor to filter the input voltage of the DC charging station.

[0008] Furthermore, the inductance is self-inductance or leakage inductance.

[0009] Further, the magnetic device L2 includes a first magnet and a first winding wound around the first magnet; One end of the first winding is connected to the power conversion component, and the other end is connected to the capacitor C2 and the positive electrode of the DC charging base respectively.

[0010] Furthermore, the first magnet is in a bar shape, a mouth shape, a ring shape or a U shape.

[0011] Furthermore, the power conversion component includes a first diode D 11 and a fourth switch S4; The first and second diode D 11 The positive electrodes of the first diode D 11 The negative electrode of is connected to the positive electrode of the rechargeable battery, the other end of the fourth switch S4 is respectively connected to the negative electrode of the rechargeable battery, the negative electrode of the DC charging stand and one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected to the positive electrode of the DC charging stand and the other end of the magnetic device L2.

[0012] Furthermore, the first diode D 11 Replaced by the first switch S1.

[0013] Furthermore, the power conversion component includes a first diode D 11 , the second diode D 12 , a third switch S3 and a fourth switch S4; The first and second diode D 11 And the second diode D 12 The negative poles of the two diodes D 11 The positive electrodes of the second diode D are connected to one end of the magnetic device L2 and one end of the fourth switch S4. 12 The positive electrode of the DC charging base is connected to one end of the capacitor C2 and one end of the third switch S3, the negative electrode of the rechargeable battery is connected to the other end of the third switch S3, the other end of the fourth switch S4 and the negative electrode of the DC charging base, and the positive electrode of the DC charging base is connected to the other end of the magnetic device L2 and the other end of the capacitor C2.

[0014] Furthermore, the first diode D 11 , the second diode D 12 They are replaced by the first switch S1 and the second switch S2 respectively.

[0015] A control method for a multifunctional charging circuit topology structure, comprising: Determine whether a charging gun is inserted into the DC charging station; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the on-board battery manager to determine whether a voltage boost is required; if a voltage boost is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after the voltage boost; if a voltage boost is not required, the rechargeable battery is directly charged; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the coupler on the ground end, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

[0016] Further, the determining whether a charging gun is inserted into the DC charging seat includes: The charging gun measures whether there is voltage at both ends of the DC charging seat. If so, it is determined that the charging gun has been inserted into the DC charging seat. Otherwise, it is determined that the charging gun has not been inserted into the DC charging seat.

[0017] Furthermore, before the magnetic device L2 is used as a coupler to perform magnetic coupling with the coupler at the ground end, the method further includes: The detection is the matching of the magnetic device L2 and the coupler at the ground end, including: detecting the inductance change of the coupler at the ground end, and after the change, detecting whether the mutual inductance between the coupler at the ground end and the magnetic device L2 meets the preset requirements, and confirming the matching if it meets the requirements.

[0018] A control device for a multifunctional charging circuit topology structure, comprising: A measurement module, used to measure voltage information at both ends of a DC charging station based on a charging gun; A judgment module, used to judge whether a charging gun is inserted into the DC charging seat according to the measurement information of the measurement module; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the on-board battery manager to determine whether a voltage boost is required; if a voltage boost is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after the voltage boost; if a voltage boost is not required, the rechargeable battery is directly charged; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the coupler on the ground end, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

[0019] The beneficial effects achieved by the present invention are: The present invention realizes two charging functions simultaneously, namely wireless charging and DC variable voltage charging, and does not need to introduce additional power devices, thereby improving the utilization rate of system switches, controllers, capacitors and magnetic core devices, etc., reducing the use of materials and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit diagram of a half-bridge rectifier - a single switch and a single diode; Figure 2 It is a circuit diagram of a half-bridge rectifier - two switches; Figure 3 It is a circuit diagram when the power conversion device is a full bridge; Figure 4 is a circuit schematic diagram in which the second switch of the full-bridge circuit is in a closed state; Figure 5 It is a circuit diagram of a full-bridge rectifier consisting of four switches; Figure 6 It is a schematic diagram of the boost state of the magnetic device L2 in scheme 1; Figure 7 This is a schematic diagram of the wireless charging state of the magnetic device L2 in scheme 1; Figure 8 is a three-dimensional schematic diagram of scheme 1 of the magnetic device L2; Fig. 9 It is a schematic diagram of boost state of scheme 2 of magnetic device L2; Fig.10 This is a schematic diagram of the wireless charging state of the magnetic device L2 in scheme 2; Fig.11 This is a schematic diagram of the boost state of the magnetic device L2 in scheme three; Fig.12 This is a schematic diagram of the wireless charging state of the magnetic device L2 in scheme 3; Fig.13 It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0022] The present invention introduces a multifunctional charging circuit topology structure, which can realize both wireless charging function and boost charging function, including a power conversion component, a magnetic device L2, a DC charging seat and a rechargeable battery; The magnetic device L2 is electrically connected to the power conversion component and the DC charging seat respectively, and the rechargeable battery is electrically connected to the power conversion component; During wireless charging, the switch in the power conversion component is turned on and off, so that the magnetic device group L2 acts as a coupler to be magnetically coupled with the coupler at the ground end, and is converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery; During boost charging, the power conversion component is controlled to make the magnetic component act as a boost inductor to boost the DC power input from the DC charging stand and input it into the rechargeable battery; Wireless charging and boost charging do not work at the same time.

[0023] Embodiment 1, as Figure 1 As shown, the power conversion component of the topological structure of the present invention includes a first diode D 11 and a fourth switch S4; Among them, the first and second diodes D 11 The positive electrodes of the first diode D 11 The negative electrode of is connected to the positive electrode of the rechargeable battery, the other end of the fourth switch S4 is respectively connected to the negative electrode of the rechargeable battery, the negative electrode N of the DC charging stand and one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected to the positive electrode P of the DC charging stand and the other end of the magnetic device L2.

[0024] During wireless charging, the capacitor C2 is used as a resonant capacitor to form a resonant unit with the inductance of the magnetic device. The inductance can be a self-inductance or a leakage inductance. The resonant frequency of the resonant unit is close to the system switching frequency. During boost charging, the capacitor C2 is used as an input filter capacitor to filter the input voltage of the DC charging station.

[0025] Its working principle is: Wireless charging: First diode D 11 The fourth switch S4 forms a half-bridge rectifier. When the rectifier is an uncontrolled passive rectifier, the fourth switch S4 performs the function of a diode; when the rectifier is a controllable active rectifier, the fourth switch S4 is controlled by a PWM signal with a certain duty cycle. The size of the duty cycle is related to the voltage gain of the rectifier, and the frequency of the PWM is the same as the switching frequency of the system. The output of the magnetic device L2 and the capacitor C2 is rectified into a DC by the half-bridge rectifier, and the capacitor C2 performs as a resonant capacitor.

[0026] During boost charging: the magnetic device L2 and the first diode D 11 The fourth switch S4 forms a boost converter (BOOST), and the fourth switch S4 is controlled by a PWM signal with a certain duty cycle, the size of which is related to the voltage gain of the boost converter. The output voltage is regulated by the fourth control switch S4, and the capacitor C2 is implemented as an input decoupling capacitor to reduce the input current ripple.

[0027] like Figure 6 , Figure 7 and Figure 8 As shown, the magnetic device L2 includes a first winding 11 and a first magnet 12, wherein the first magnet 1 is in a bar shape; The magnetic device L1 at the ground end includes a second winding 21 and a second magnet 22; During boost charging: the magnetic device L2 is a boost inductor.

[0028] During wireless charging: the magnetic device L2 is a coupler (coupling coil), which forms a magnetic coupling with the magnetic core device L1 to form a magnetic circuit.

[0029] Embodiment 2, as Figure 2 As shown, the difference from Embodiment 1 is that the power conversion component of the topological structure of the present invention includes a first switch S1 and a fourth switch S4; Among them, one end of the first switch S1 is respectively connected to one end of the magnetic device L2 and one end of the fourth switch S4, the other end of the first switch S1 is connected to the positive electrode of the rechargeable battery, the other end of the fourth switch S4 is respectively connected to the negative electrode of the rechargeable battery, the negative electrode N of the DC charging seat and one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected to the positive electrode P of the DC charging seat and the other end of the magnetic device L2.

[0030] Its working principle is: During wireless charging: the first switch S1 and the fourth switch S4 form a half-bridge rectifier. When the rectifier is an uncontrolled passive rectifier, the first switch S1 and the fourth switch S4 perform the function of a diode; when the rectifier is a controllable active rectifier, the first switch S1 and the fourth switch S4 are respectively controlled by a PWM signal with a certain duty cycle, the two PWM signals are different, and the frequency of the PWM is the same as the switching frequency of the system. The output of the magnetic device L2 and the capacitor C2 is rectified into a DC by the half-bridge rectifier, and the capacitor C2 performs as a resonant capacitor.

[0031] During boost charging: the magnetic device L2, the first switch S1 and the fourth switch S4 form a boost converter (BOOST), the first switch S1 performs the function of a diode, and the fourth switch S4 is controlled by a PWM signal with a certain duty cycle, the size of which is related to the voltage gain of the boost converter. The output voltage is adjusted by the fourth control switch S4, and the capacitor C2 acts as an input decoupling capacitor to reduce the input current ripple.

[0032] Embodiment 3, as Figure 3 As shown, the power conversion component of the topological structure of the present invention includes a first diode D 11 , the second diode D 12 , a third switch S3 and a fourth switch S4; The first and second diode D 11 And the second diode D 12 The negative poles of the two diodes D 11 The positive electrodes of the second diode D are connected to one end of the magnetic device L2 and one end of the fourth switch S4. 12 The positive electrode of the DC charging base is respectively connected to one end of the capacitor C2 and one end of the third switch S3, the negative electrode of the rechargeable battery is respectively connected to the other end of the third switch S3, the other end of the fourth switch S4 and the negative electrode N of the DC charging base, and the positive electrode P of the DC charging base is respectively connected to the other end of the magnetic device L2 and the other end of the capacitor C2.

[0033] like Fig. 9 and Fig.10 As shown, the magnetic device L2 includes a first winding 11 and a first magnet 12, wherein the first magnet 1 is in the shape of a mouth or a ring; The magnetic device L1 at the ground end includes a second winding 21 and a second magnet 22; During boost charging: the magnetic device L2 is a boost inductor. Compared with the magnetic device L2 in Embodiment 1, the magnetic circuit of the first magnet 12 of the magnetic device L2 in this embodiment is closed, the magnetic field leakage is small, and the impact on the surrounding environment is small.

[0034] During wireless charging: The magnetic device L2 is a coupler (coupling coil), which forms a magnetic coupling with the magnetic core device L1 to form a magnetic loop. Compared with the bar magnet, the upper half of the ring magnet will generate a small amount of magnetic flux, which is not captured by the first winding and is wasted.

[0035] Its working principle is: Wireless charging: First diode D 11 , the second diode D 12The third switch S3 and the fourth switch S4 form a full-bridge rectifier. When the rectifier is an uncontrolled passive rectifier, the third switch S3 and the fourth switch S4 perform the function of a diode; when the rectifier is a controllable active rectifier, the third switch S3 and the fourth switch S4 are respectively controlled by a PWM signal with a certain duty cycle, the two PWM signals are different, and the frequency of the PWM is the same as the switching frequency of the system. The output of the magnetic device L2 and the capacitor C2 is rectified into a DC by the full bridge, and the capacitor C2 performs as a resonant capacitor.

[0036] During boost charging: the magnetic device L2 and the first diode D 11 The fourth switch S4 forms a boost converter (BOOST), the third switch S3 is in a closed state, and the second diode D 12 The fourth switch S4 is in a blocking state, and is controlled by a PWM signal with a certain duty cycle, the size of which is related to the voltage gain of the boost converter. The output voltage is adjusted by controlling the fourth switch S4, and one end of the capacitor C2 is short-connected to the ground (the negative pole of the DC charging station and the negative pole of the battery) by the third switch S3, so the capacitor C2 acts as an input decoupling capacitor to reduce the input current ripple.

[0037] Embodiment 4, as Figure 4 As shown, the difference from Embodiment 3 is that the power conversion component of the topological structure of the present invention includes a first switch S1, a second switch S2, a third switch S3 and a fourth switch S4; One end of the first switch S1 and the second switch S2 are both connected to the positive electrode of the rechargeable battery, the other end of the first switch S1 is respectively connected to one end of the magnetic device L2 and one end of the fourth switch S4, the other end of the second switch S2 is respectively connected to one end of the capacitor C2 and one end of the third switch S3, the negative electrode of the rechargeable battery is respectively connected to the other end of the third switch S3, the other end of the fourth switch S4 and the negative electrode N of the DC charging stand, and the positive electrode P of the DC charging stand is respectively connected to the other end of the magnetic device L2 and the other end of the capacitor C2.

[0038] Its working principle is: During wireless charging: the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 form a full-bridge rectifier. When the rectifier is an uncontrolled passive rectifier, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 perform the function of a diode; when the rectifier is a controllable active rectifier, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are respectively controlled by a PWM signal with a certain duty cycle, and the four PWM signals are different, and the frequency of the PWM is the same as the switching frequency of the system. The output of the magnetic device L2 and the capacitor C2 is rectified into a DC by the full bridge, and the capacitor C2 performs as a resonant capacitor.

[0039] During boost charging: the magnetic device L2, the first switch S1, and the fourth switch S4 form a boost converter (BOOST), the third switch S3 is in a closed state, the first switch S1 performs the function of a diode, the second switch S2 is in an open state, and the fourth switch S4 is controlled by a PWM signal with a certain duty cycle, the size of which is related to the voltage gain of the boost converter. The output voltage is adjusted by controlling the fourth switch S4, and one end of the capacitor C2 is short-connected to the ground by the third switch S3, so the capacitor C2 acts as an input decoupling capacitor to reduce the input current ripple.

[0040] Embodiment 5, as Fig.11 and Fig.12 As shown, the difference from Embodiment 4 is that the magnetic device L2 includes a first winding 11 and a first magnet 12, wherein the first magnet 1 is U-shaped; During boost charging: the magnetic device L2 is a boost inductor. The magnetic path includes the U-shaped first magnet and the air gap in the U-shaped concave area. The magnetic field leakage on the upper and lower sides of the first magnet is small, which has little impact on the electronic devices on the upper side and the external environment on the lower side. At the same time, the U-shaped magnet is smaller in size and lighter in weight than the mouth-shaped or round-shaped magnet.

[0041] During wireless charging: the magnetic device L2 is a coupler (coupling coil), which forms a magnetic coupling with the magnetic core device L1 to form a magnetic circuit.

[0042] Embodiment 6, as Figure 3 As shown, the present invention also provides a control method for a multifunctional charging circuit topology structure, comprising: Determine whether a charging gun is inserted into the DC charging station; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the on-board battery manager to determine whether a voltage boost is required; if a voltage boost is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after the voltage boost; if a voltage boost is not required, the rechargeable battery is directly charged; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the magnetic device L1, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

[0043] The step of determining whether a charging gun is inserted into a DC charging station includes: The charging gun measures whether there is voltage at both ends of the DC charging seat. If so, it is determined that the charging gun has been inserted into the DC charging seat. Otherwise, it is determined that the charging gun has not been inserted into the DC charging seat.

[0044] Before the magnetic device L2 is used as a coupler to perform magnetic coupling with the magnetic device L1, the method further includes: The detection is to match the magnetic device L2 with the magnetic device L1, including: detecting the change of the inductance of the magnetic device L1, and after the change, detecting whether the mutual inductance between the magnetic device L1 and the magnetic device L2 meets the preset requirements, and confirming the matching if it meets the requirements.

[0045] Embodiment 7, the present invention further provides a control device of a multifunctional charging circuit topology structure, comprising: A measurement module, used to measure voltage information at both ends of a DC charging station based on a charging gun; A judgment module, used to judge whether a charging gun is inserted into the DC charging seat according to the measurement information of the measurement module; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the on-board battery manager to determine whether a voltage boost is required; if a voltage boost is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after the voltage boost; if a voltage boost is not required, the rechargeable battery is directly charged; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the coupler on the ground end, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multifunctional charging circuit topology structure, characterized in that: It includes a power conversion component, a magnetic device L2, a DC charging stand and a rechargeable battery; The magnetic device L2 is electrically connected to the power conversion component and the DC charging seat respectively, and the rechargeable battery is electrically connected to the power conversion component; During wireless charging, the switch in the power conversion component is turned on and off, so that the magnetic device L2 acts as a coupler to be magnetically coupled with the coupler at the ground end, and is converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery; During boost charging, the power conversion component is controlled to make the magnetic component act as a boost inductor to boost the DC power input from the DC charging stand and input it to the rechargeable battery.

2. The multifunctional charging circuit topology structure according to claim 1, characterized in that: Also includes: Capacitor C2, wherein the capacitor C2 is electrically connected to the magnetic device L2, the power conversion component and the DC charging base respectively; During wireless charging, the capacitor C2 is used as a resonant capacitor to form a resonant unit with the inductance of the magnetic device L2; During boost charging, the capacitor C2 is used as an input filter capacitor to filter the input voltage of the DC charging station.

3. The multifunctional charging circuit topology structure according to claim 2, characterized in that: The inductance is self-inductance or leakage inductance.

4. The multifunctional charging circuit topology structure according to claim 2, characterized in that: The magnetic device L2 includes a first magnet and a first winding wound around the first magnet; One end of the first winding is connected to the power conversion component, and the other end is connected to the capacitor C2 and the positive electrode of the DC charging base respectively.

5. The multifunctional charging circuit topology structure according to claim 4, characterized in that: The first magnet is in a bar shape, a mouth shape, a ring shape or a U shape.

6. The multifunctional charging circuit topology structure according to any one of claims 2 to 5, characterized in that: The power conversion component includes a first diode D 11 and a fourth switch S4; The first and second diode D 11 The positive electrodes of the first diode D 11 The negative electrode of is connected to the positive electrode of the rechargeable battery, the other end of the fourth switch S4 is respectively connected to the negative electrode of the rechargeable battery, the negative electrode of the DC charging stand and one end of the capacitor C2, and the other end of the capacitor C2 is respectively connected to the positive electrode of the DC charging stand and the other end of the magnetic device L2.

7. The multifunctional charging circuit topology structure according to claim 6, characterized in that: The first diode D 11 Replaced by the first switch S1.

8. The multifunctional charging circuit topology structure according to any one of claims 2 to 5, characterized in that: The power conversion component includes a first diode D 11 , the second diode D 12 , a third switch S3 and a fourth switch S4; The first and second diode D 11 And the second diode D 12 The negative poles of the two diodes D 11 The positive electrodes of the second diode D are connected to one end of the magnetic device L2 and one end of the fourth switch S4. 12 The positive electrode of the DC charging base is connected to one end of the capacitor C2 and one end of the third switch S3, the negative electrode of the rechargeable battery is connected to the other end of the third switch S3, the other end of the fourth switch S4 and the negative electrode of the DC charging base, and the positive electrode of the DC charging base is connected to the other end of the magnetic device L2 and the other end of the capacitor C2.

9. The multifunctional charging circuit topology structure according to claim 8, characterized in that: The first diode D 11 , the second diode D 12 They are replaced by the first switch S1 and the second switch S2 respectively.

10. A control method based on the multifunctional charging circuit topology structure according to any one of claims 1 to 9, characterized in that: include: Determine whether a charging gun is inserted into the DC charging station; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the vehicle battery manager to determine whether a voltage boost is required; If boosting is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after boosting; if boosting is not required, the rechargeable battery is charged directly; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the coupler on the ground end, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

11. The control method of the multifunctional charging circuit topology structure according to claim 10, characterized in that: The step of determining whether a charging gun is inserted into a DC charging station includes: Disconnect the switch of the power conversion component, and the detection circuit measures whether there is voltage at both ends of the DC charging seat. If so, it is determined that the charging gun has been inserted into the DC charging seat. Otherwise, it is determined that the charging gun has not been inserted into the DC charging seat.

12. The control method of the multifunctional charging circuit topology structure according to claim 11, characterized in that: Before the magnetic device L2 is used as a coupler to perform magnetic coupling with the coupler at the ground end, the method further includes: The detection is the matching of the magnetic device L2 and the coupler at the ground end, including: detecting the inductance change of the coupler at the ground end, and after the change, detecting whether the mutual inductance between the coupler at the ground end and the magnetic device L2 meets the preset requirements, and confirming the matching if it meets the requirements.

13. A control device based on the multifunctional charging circuit topology structure according to any one of claims 1 to 9, characterized in that: include: A measurement module, used to measure voltage information at both ends of a DC charging station based on a charging gun; A judgment module, used to judge whether a charging gun is inserted into the DC charging seat according to the measurement information of the measurement module; If the charging gun is inserted into the DC charging station, the voltage of the DC charging station is detected, and the detected voltage is compared with the required voltage of the vehicle battery manager to determine whether a voltage boost is required; If boosting is required, a PWM signal is output to the switch in the power conversion component to adjust the output voltage and current, and the rechargeable battery is charged after boosting; if boosting is not required, the rechargeable battery is charged directly; If the charging gun is not inserted into the DC charging socket, the switch of the power conversion component is controlled to be on and off, and the magnetic device L2 is used as a coupler to magnetically couple with the coupler on the ground end, and converted into alternating current in the form of an alternating high-frequency electromagnetic field, which is rectified into direct current by the power conversion component and input into the rechargeable battery.

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