Charging system, vehicle-mounted circuit system and vehicle

Abstract

The utility model discloses a charging system, a vehicle-mounted circuit system and a vehicle. The charging system comprises a first charging loop, a second charging loop and a photovoltaic interface. Wherein the first charging loop is used for being connected with a vehicle-mounted battery; the second charging loop is used for being connected with the vehicle-mounted battery; the photovoltaic interface is used for connecting a photovoltaic power generation panel, and the photovoltaic interface is connected with the first charging loop and the second charging loop in an on-off manner; when the photovoltaic interface and the first charging loop are conducted, the photovoltaic power generation panel supplies power to a vehicle-mounted battery through the first charging loop; and when the photovoltaic interface and the second charging loop are conducted, the photovoltaic power generation panel supplies power to the vehicle-mounted battery through the second charging loop. No extra DC boost loop is needed, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of electricity, and more specifically to a charging system, an on-board circuit system and a vehicle. Background Art

[0002] The charging system installed on the electric vehicle includes an AC charging system and a DC charging system, wherein the AC system is usually used for slow charging, and the DC charging system is usually used for fast charging. In order to use solar energy to charge electric vehicles, photovoltaic panels are usually provided on electric vehicles to charge the on-board batteries. In the related art, an additional set of DC boost circuits is used, and the photovoltaic panels charge the on-board batteries through the additional DC boost circuits. However, this solution requires the addition of a DC boost circuit, resulting in higher costs. Utility Model Content

[0003] The present utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a charging system is provided, the charging system comprising: a first charging circuit, a second charging circuit and a photovoltaic interface; wherein the first charging circuit is used to connect to a vehicle battery; the second charging circuit is used to connect to the vehicle battery; the photovoltaic interface is used to connect to a photovoltaic power generation panel, and the photovoltaic interface is connected to the first charging circuit and the second charging circuit in a disconnectable manner; when the photovoltaic interface is connected to the first charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the second charging circuit.

[0004] In one embodiment of the present application, the first charging circuit is an AC charging circuit, and the second charging circuit is a DC charging circuit; when the photovoltaic power generation panel supplies power to the vehicle battery through the second charging circuit, the first charging circuit is connected to the AC charging port, and the AC charging device connected to the AC charging port simultaneously supplies power to the vehicle battery through the AC charging circuit; when the photovoltaic power generation panel supplies power to the vehicle battery through the first charging circuit, the second charging circuit is connected to the DC charging port, and the DC charging device connected to the DC charging port simultaneously supplies power to the vehicle battery through the DC charging circuit.

[0005] In one embodiment of the present application, the first charging circuit includes a first DC-DC circuit for connecting to the vehicle battery, and the second charging circuit includes a second DC-DC circuit for connecting to the vehicle battery; the charging system also includes a switch component; the switch component is configured to: control the conduction and disconnection between the photovoltaic interface and the first DC-DC circuit, and control the conduction and disconnection between the photovoltaic interface and the second DC-DC circuit; when the switch component is configured to conduct the photovoltaic interface with the first DC-DC circuit, the first DC-DC circuit is configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery; when the switch component is configured to conduct the photovoltaic interface with the second DC-DC circuit, the second DC-DC circuit is configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery.

[0006] In one embodiment of the present application, the switch component includes: a first switch and a second switch; wherein the first switch is configured to: control the conduction and disconnection between the positive pole of the photovoltaic interface and the positive pole of the first DC-DC circuit, and control the conduction and disconnection between the positive pole of the photovoltaic interface and the positive pole of the second DC-DC circuit; the second switch is configured to: control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the first DC-DC circuit, and control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the second DC-DC circuit.

[0007] In one embodiment of the present application, the first switch is a first single-pole double-throw switch, and the second switch is a second single-pole double-throw switch; wherein the common end of the first single-pole double-throw switch is connected to the positive pole of the photovoltaic interface, the first switching end of the first single-pole double-throw switch is connected to the positive pole of the first DC-DC circuit, and the second switching end of the first single-pole double-throw switch is connected to the positive pole of the second DC-DC circuit; the common end of the second single-pole double-throw switch is connected to the negative pole of the photovoltaic interface, the first switching end of the second single-pole double-throw switch is connected to the negative pole of the first DC-DC circuit, and the second switching end of the second single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit.

[0008] In one embodiment of the present application, the first charging circuit is an AC charging circuit, and the AC charging circuit further includes: a PFC circuit, and an AC charging port that can be connected to the PFC circuit; wherein the output positive electrode of the PFC circuit is connected to the positive electrode of the first DC-DC circuit, and the output negative electrode of the PFC circuit is connected to the negative electrode of the first DC-DC circuit; and the first switching end of the first single-pole double-throw switch is connected to the output positive electrode of the PFC circuit and the positive electrode of the first DC-DC circuit, and the first switching end of the second single-pole double-throw switch is connected to the output negative electrode of the PFC circuit and the negative electrode of the first DC-DC circuit.

[0009] In one embodiment of the present application, the AC charging port includes: a first phase line terminal, a second phase line terminal, a third phase line terminal and a negative terminal; the PFC circuit includes: three bridge arms and three inductors; the three bridge arms are respectively a first bridge arm, a second bridge arm and a third bridge arm connected in parallel, and the three inductors are respectively a first inductor, a second inductor and a third inductor; wherein, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the first phase line terminal in a switchable manner; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the second phase line terminal in a switchable manner; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the third phase line terminal in a switchable manner; and the second end of the third inductor is also connected to the negative terminal in a switchable manner.

[0010] In one embodiment of the present application, when the second end of the first inductor is connected to the first phase line terminal, the second end of the second inductor is connected to the second phase line terminal, and the second end of the third inductor is connected to the third phase line terminal, the AC charging circuit is configured to charge the vehicle battery; when the second end of the third inductor is connected to the negative terminal, if the second end of the first inductor is connected to the first phase line terminal, or / and, the second end of the second inductor is connected to the second phase line terminal, then the AC charging circuit is configured to discharge the vehicle battery to the outside.

[0011] In one embodiment of the present application, the second charging circuit is a DC charging circuit, and the DC charging circuit further includes: a DC charging port that can be connected to the second DC-DC circuit.

[0012] In one embodiment of the present application, the first charging circuit is an AC charging circuit, and the AC charging circuit also includes: an AC charging port, and a PFC circuit connected to the first DC-DC circuit; the second charging circuit is a DC charging circuit, and the DC charging circuit also includes a DC charging port; the switch component includes a first switch component and a second switch component; wherein the first switch component is configured as: the conduction and disconnection between the PFC circuit and the AC charging port, and the conduction and disconnection between the PFC circuit and the photovoltaic interface; and when the PFC circuit is connected to the photovoltaic interface, the PFC circuit and the first DC-DC circuit are configured to input the electric energy output by the photovoltaic power generation panel into the vehicle battery after boosting; the second switch component is configured as: the conduction and disconnection between the second DC-DC circuit and the DC charging port, and the conduction and disconnection between the second DC-DC circuit and the photovoltaic interface.

[0013] In one embodiment of the present application, the first switch component includes: a third switch and a fourth switch; wherein the third switch is configured to: turn on and off the input positive pole of the PFC circuit and the positive pole of the AC charging port, and turn on and off the input positive pole of the PFC circuit and the positive pole of the photovoltaic interface; the fourth switch is configured to: turn on and off the input negative pole of the PFC circuit and the negative pole of the AC charging port, and turn on and off the input negative pole of the PFC circuit and the negative pole of the photovoltaic interface.

[0014] In one embodiment of the present application, the third switch is a third single-pole double-throw switch, and the fourth switch is a fourth single-pole double-throw switch; wherein the common end of the third single-pole double-throw switch is connected to the input positive pole of the PFC circuit, the first switching end of the third single-pole double-throw switch is connected to the positive pole of the AC charging port, and the second switching end of the third single-pole double-throw switch is connected to the positive pole of the photovoltaic interface; the common end of the fourth single-pole double-throw switch is connected to the input negative pole of the PFC circuit, the first switching end of the fourth single-pole double-throw switch is connected to the negative pole of the AC charging port, and the second switching end of the fourth single-pole double-throw switch is connected to the negative pole of the photovoltaic interface.

[0015] In one embodiment of the present application, the PFC circuit includes: an input positive electrode, an input negative electrode, three bridge arms and three inductors; the three bridge arms are respectively a first bridge arm, a second bridge arm and a third bridge arm connected in parallel, and the three inductors are respectively a first inductor, a second inductor and a third inductor; wherein, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the input positive electrode; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the input positive electrode; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the input negative electrode.

[0016] In one embodiment of the present application, the AC charging port includes: a phase line terminal and a negative terminal, wherein the input positive pole and the phase line terminal are connected in an on-off manner, and the input negative pole and the negative terminal are connected in an on-off manner; and when the input positive pole is conductively connected to the phase line terminal and the input negative pole is conductively connected to the negative terminal, the AC charging circuit is configured to charge the vehicle battery.

[0017] In one embodiment of the present application, the second switch component includes: a fifth switch and a sixth switch; wherein the fifth switch is configured to: turn on and off the positive pole of the second DC-DC circuit and the positive pole of the DC charging port, and turn on and off the positive pole of the second DC-DC circuit and the positive pole of the photovoltaic interface; the sixth switch is configured to: turn on and off the negative pole of the second DC-DC circuit and the negative pole of the DC charging port, and turn on and off the negative pole of the second DC-DC circuit and the negative pole of the photovoltaic interface.

[0018] In one embodiment of the present application, the fifth switch is a fifth single-pole double-throw switch, and the sixth switch is a sixth single-pole double-throw switch; wherein the common end of the fifth single-pole double-throw switch is connected to the positive pole of the second DC-DC circuit, the first switching end of the fifth single-pole double-throw switch is connected to the positive pole of the DC charging port, and the second switching end of the fifth single-pole double-throw switch is connected to the positive pole of the photovoltaic interface; the common end of the sixth single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit, the first switching end of the sixth single-pole double-throw switch is connected to the negative pole of the DC charging port, and the second switching end of the sixth single-pole double-throw switch is connected to the negative pole of the photovoltaic interface.

[0019] According to the second aspect of the present application, a vehicle-mounted circuit system is also provided, which includes: a vehicle-mounted battery, a photovoltaic power generation panel, and any one of the charging systems described above; wherein the vehicle-mounted battery is connected to the first charging circuit and the second charging circuit, and the photovoltaic interface is connected to the photovoltaic power generation panel.

[0020] According to a third aspect of the present application, a vehicle is also provided, comprising any one of the above-mentioned on-board circuit systems.

[0021] According to the charging system, vehicle circuit system and vehicle provided by the embodiment of the present application, the photovoltaic interface is connected to the first charging circuit and the second charging circuit in an on-off manner; when the photovoltaic interface is connected to the first charging circuit, the photovoltaic panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic panel supplies power to the vehicle battery through the second charging circuit. Thus, the reuse of the two charging circuits is realized, and there is no need to set up an additional DC boost circuit, which reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A circuit topology diagram of a charging system according to an embodiment of the present utility model;

[0024] Figure 2 A circuit topology diagram of a charging system according to another embodiment of the present utility model;

[0025] Figure 3 This is a state diagram of a switch component in one charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0026] Figure 4 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0027] Figure 5 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0028] Figure 6 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0029] Figure 7 A circuit topology diagram of a charging system according to another embodiment of the present utility model;

[0030] Figure 8 A circuit topology diagram of a charging system according to another embodiment of the present utility model;

[0031] Fig. 9This is a state diagram of a switch component in one charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0032] Fig.10 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0033] Fig.11 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model;

[0034] Fig.12 This is a state diagram of a switch component in another charging working mode of a photovoltaic power generation panel according to an embodiment of the utility model. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0036] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0037] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0038] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0039] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0040] In the related technology, the charging system installed on the electric vehicle includes an AC charging system and a DC charging system. Among them, the AC charging system includes an AC charging pile and an on-board charger (OBC). The on-board charger is generally divided into a PFC circuit + an isolated high-voltage DC-DC circuit in terms of electrical principle topology. For electric vehicles that support high-voltage platforms (the maximum voltage of the power battery is higher than 500V), the DC charging system includes a DC fast charging pile and an on-board boost circuit. The on-board boost circuit generally uses a DC-DC boost circuit or a motor boost circuit.

[0041] In the related technology, photovoltaic panels are installed on electric vehicles to generate electricity using solar energy. Since the output power of photovoltaic panels is unstable, a DC-DC conversion circuit needs to be added to achieve maximum power point tracking (MPPT). Adding a DC-DC conversion circuit and its control system to electric vehicles requires higher material costs and system complexity. More and more electric vehicles are considering reusing existing on-board system circuits when designing solar charging systems to reduce the additional material costs and system complexity as much as possible. The details are as follows:

[0042] 1) Specifically for photovoltaic panels, a BOOST boost circuit and its control system are added. This solution requires a considerable increase in material cost and system complexity. In addition, the added BOOST boost circuit does not work at all in a non-sunlight environment and has a low utilization rate.

[0043] 2) The DC-DC circuit in the OBC is used to boost the photovoltaic panel. However, this solution cannot realize the OBC and the photovoltaic panel to charge the power battery at the same time in a sunlight environment, resulting in energy waste of the photovoltaic panel.

[0044] 3) The DC-DC circuit in the DC charging loop is used to boost the photovoltaic panels. However, when the DC fast charging is performed in the sunlight environment, it is limited by the charging power of the DC-DC boost circuit and can only be charged at the maximum charging power of the DC-DC boost circuit. Under this condition, the actual charging power of the electric vehicle is still limited and the charging speed cannot be increased.

[0045] The above-mentioned technical problems existing in the related technologies can be solved by the technical solutions shown in some embodiments of the present application.

[0046] The present application embodiment provides a charging system, referring to Figure 1 , Figure 2 , Figure 7 and Figure 8The charging system includes: a first charging circuit, a second charging circuit and a photovoltaic interface; wherein the first charging circuit is used to connect to a vehicle battery; the second charging circuit is used to connect to a vehicle battery; the photovoltaic interface is used to connect to a photovoltaic power generation panel, and the photovoltaic interface is connected to the first charging circuit and the second charging circuit in an on-off manner; when the photovoltaic interface is connected to the first charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the second charging circuit.

[0047] In the above scheme, the photovoltaic interface is connected to the first charging circuit and the second charging circuit in an on-off manner; when the photovoltaic interface is connected to the first charging circuit, the photovoltaic panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic panel supplies power to the vehicle battery through the second charging circuit. Thus, the reuse of the two charging circuits is realized, and there is no need to set up an additional DC boost circuit, which reduces costs. The above structures are described in detail below in conjunction with the accompanying drawings.

[0048] When setting the first charging circuit and the second charging circuit, one of the first charging circuit and the second charging circuit may be a DC charging circuit, and the other charging circuit may be an AC charging circuit, that is, the two charging circuits support different current types. For example, the first charging circuit may be an AC charging circuit, and the second charging circuit may be a DC charging circuit. Of course, the opposite setting method may also be adopted.

[0049] For example, when the first charging circuit is an AC charging circuit and the second charging circuit is a DC charging circuit, different charging circuits can also be connected to the charging ports of the corresponding charging circuits in a disconnectable manner. For example, the AC charging circuit is connected to the AC charging port in a disconnectable manner, and the DC charging port is connected to the DC charging port in a disconnectable manner.

[0050] For example, when the photovoltaic panel supplies power to the vehicle battery through the second charging circuit, the first charging circuit can be connected to the AC charging port, and the AC charging device connected to the AC charging port can simultaneously supply power to the vehicle battery through the AC charging circuit. That is, when the charging device only has an AC charging device but no DC charging device, the photovoltaic panel can supply power to the vehicle battery through the second charging circuit while the AC charging circuit is connected to the AC charging port, so that the AC charging device connected to the AC charging port can simultaneously supply power to the vehicle battery through the AC charging circuit, thereby improving the charging efficiency of the vehicle battery.

[0051] Exemplarily, when the photovoltaic panel supplies power to the vehicle battery through the first charging circuit, the second charging circuit is connected to the DC charging port, and the DC charging device connected to the DC charging port supplies power to the vehicle battery through the DC charging circuit at the same time. That is, when the charging device only has a DC charging device but no AC charging device, the photovoltaic panel can supply power to the vehicle battery through the first charging circuit while the DC charging circuit is connected to the DC charging port, so that the DC charging device connected to the DC charging port supplies power to the vehicle battery through the DC charging circuit at the same time, thereby improving the charging efficiency of the vehicle battery.

[0052] Exemplarily, the first charging circuit may include a first DC-DC circuit for connecting to a vehicle battery, and the second charging circuit may include a second DC-DC circuit for connecting to a vehicle battery. The charging system may further include a switch assembly. The switch assembly is configured to: control the conduction and disconnection between the photovoltaic interface and the first DC-DC circuit, and control the conduction and disconnection between the photovoltaic interface and the second DC-DC circuit; when the switch assembly is configured to conduct the photovoltaic interface with the first DC-DC circuit, the first DC-DC circuit is configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery; when the switch assembly is configured to conduct the photovoltaic interface with the second DC-DC circuit, the second DC-DC circuit is configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery.

[0053] In the above-mentioned embodiment, the photovoltaic interface is configured to be connected to the first DC-DC circuit in the AC charging circuit, or to be connected to the second DC-DC circuit in the DC charging circuit, through the switch component. When the switch component is configured so that the photovoltaic interface is connected to the first DC-DC circuit, the first DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting; when the switch component is configured so that the photovoltaic interface is connected to the second DC-DC circuit, the second DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting. In this way, the reuse of the DC-DC circuit in the AC charging circuit or the DC charging circuit is realized, and there is no need to set up an additional DC boost circuit, thereby reducing costs.

[0054] When setting up the AC charging circuit as the first charging circuit, various methods can be used. For example, refer to Figure 1 and Figure 7 The AC charging circuit includes a first DC-DC circuit, which is used to convert the voltage of direct current to charge the vehicle battery or discharge the vehicle battery. There are many ways to set the first DC-DC circuit. For example, Figure 1 and Figure 7The first DC-DC circuit shown in the figure can adopt a high-voltage isolated bilateral DC-DC conversion circuit, wherein the high voltage refers to a voltage exceeding a certain threshold, and the isolated bilateral refers to a transformer being provided in the first DC-DC circuit, so that the input and output ends of the first DC-DC circuit are isolated. Figure 1 The first DC-DC circuit shown is composed of a transformer and two groups of bridge arms, each group of bridge arms includes two bridge arms connected in parallel, and the connection method of the bridge arms is as follows: Figure 1 As shown, the bus positive pole of one group of bridge arms is connected to the positive pole of the vehicle battery, and the bus negative pole is connected to the negative pole of the vehicle battery. The bus positive pole of another group of bridge arms is connected to the output positive pole of the PFC circuit in the AC charging circuit, and the bus negative pole is connected to the output negative pole of the PFC circuit in the AC charging circuit.

[0055] Exemplary, reference Figure 1 and Figure 7 , the first charging circuit is an AC charging circuit, and the AC charging circuit also includes a PFC circuit and an AC charging port that can be connected to the PFC circuit. The AC charging port is used to plug and connect with the charging gun on the external AC charging pile. The AC charging port can be set in any type of plug connector. The PFC circuit is used for rectification. When the AC charging pile charges the vehicle battery through the AC charging circuit, the PFC circuit is used to rectify the AC power into DC power. For example, refer to Figure 1 and Figure 7 The PFC circuit has an input end and an output end, wherein the input end of the PFC circuit is connected to the AC charging port in an on-off manner, and the output end of the PFC circuit is connected to the first DC-DC circuit. Thus, when the vehicle battery is not charged through the AC charging port, the AC charging port and the first DC-DC circuit can be connected; when the vehicle battery is charged through the AC charging port, the AC charging port and the first DC-DC circuit can be disconnected.

[0056] Exemplarily, the bridge arms in the PFC circuit in the AC charging loop and the first DC-DC circuit may reuse the bridge arms in the motor or the motor controller, or may use separately provided bridge arms.

[0057] Exemplarily, the second charging circuit may be a DC charging circuit. When setting the DC charging circuit, refer to Figure 1 and Figure 2 The DC charging circuit includes a second DC-DC circuit for connecting to the vehicle battery, and the second DC-DC circuit is also used to convert the voltage of the DC power to charge the vehicle battery. There are many ways to set the second DC-DC circuit. For example, Figure 1 and Figure 2The second DC-DC circuit shown uses a non-isolated DC-DC conversion circuit. In other embodiments, an isolated DC-DC conversion circuit may also be used. Figure 1 The second DC-DC circuit in the embodiment is composed of a bridge arm and an inductor. Figure 2 The second DC-DC circuit in the embodiment is composed of three groups of bridge arms and inductors. Exemplarily, the bridge arms and inductors in the second DC-DC circuit can reuse the bridge arms and inductors in the motor.

[0058] Exemplary, reference Figure 1 and Figure 7 The second charging circuit is a DC charging circuit, and the DC charging circuit may include a DC charging port, which is used to plug and connect with the charging gun on the external DC charging pile. The type of the DC charging port can be any type of plug connector. The DC charging port and the second DC-DC circuit are connected in a switchable manner, so that when the vehicle battery is not charged through the DC charging port, the DC charging port and the second DC-DC circuit can be connected; when the vehicle battery is charged through the DC charging port, the DC charging port and the second DC-DC circuit can be disconnected.

[0059] When setting up the PV interface, refer to Figure 1 , the photovoltaic interface is used to connect photovoltaic panels. Figure 1 The photovoltaic interface has a positive electrode and a negative electrode. The positive electrode of the photovoltaic interface is connected to the positive electrode of the photovoltaic power generation panel, and the negative electrode of the photovoltaic interface is used to connect the negative electrode of the photovoltaic power generation panel. The photovoltaic interface can be set in a variety of ways. Exemplarily, the photovoltaic interface can use connectors such as but not limited to connectors, pads, pins, etc.

[0060] When setting the switch component, the switch component is configured to: control the conduction and disconnection between the photovoltaic interface and the first DC-DC circuit, and control the conduction and disconnection between the photovoltaic interface and the second DC-DC circuit. That is, the photovoltaic interface and the first DC-DC circuit can be connected or disconnected by configuring the switch component; the photovoltaic interface and the second DC-DC circuit can also be connected or disconnected by configuring the switch component. Among them, when the switch component is configured to make the photovoltaic interface and the first DC-DC circuit conductive, the first DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting, that is, at this time, the photovoltaic power generation panel charges the vehicle battery through the first DC-DC circuit. When the switch component is configured to make the photovoltaic interface and the second DC-DC circuit conductive, the second DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting, that is, at this time, the photovoltaic power generation panel charges the vehicle battery through the second DC-DC circuit.

[0061] When setting the switch assembly, a variety of methods can be used, and several setting methods are introduced as examples below.

[0062] In some embodiments, the photovoltaic interface charges the vehicle battery through the first DC-DC circuit in the AC charging circuit but not through the PFC circuit in the AC charging circuit, such as Figure 1 to Figure 6 In other embodiments, the photovoltaic interface is used to charge the vehicle battery through the PFC circuit and the first DC-DC circuit in the AC charging circuit in sequence, such as Figure 7 to Figure 12 The setting method shown in is this setting method. The following will introduce them separately.

[0063] First, let’s introduce Figure 1 to Figure 6 The photovoltaic interface shown in the figure does not charge the vehicle battery through the PFC circuit in the AC charging circuit. Based on this design concept, multiple embodiments can also be extended.

[0064] Exemplary, reference Figure 1 and Figure 2 , the switch component may include: a first switch and a second switch. Among them, the first switch is configured to: control the conduction and disconnection between the positive pole of the photovoltaic interface and the positive pole of the first DC-DC circuit, and control the conduction and disconnection between the positive pole of the photovoltaic interface and the positive pole of the second DC-DC circuit. That is, the first switch is used to determine whether the positive pole of the photovoltaic interface is connected to the positive pole of the first DC-DC circuit, or to determine the conduction between the positive pole of the photovoltaic interface and the positive pole of the second DC-DC circuit. If the first switch is configured to connect the positive pole of the photovoltaic interface to the positive pole of the first DC-DC circuit, then after the negative pole of the photovoltaic interface is connected to the negative pole of the first DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the first DC-DC circuit. Of course, the first switch can also be configured to connect the positive pole of the photovoltaic interface to the positive pole of the second DC-DC circuit. After the negative pole of the photovoltaic interface is connected to the negative pole of the second DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the second DC-DC circuit. Of course, the first switch can also be configured so that the positive pole of the photovoltaic interface is neither connected to the positive pole of the first DC-DC circuit nor to the positive pole of the second DC-DC circuit, that is, the positive pole of the photovoltaic interface is disconnected from both the positive pole of the first DC-DC circuit and the positive pole of the second DC-DC circuit.

[0065] The second switch is configured to: control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the first DC-DC circuit, and control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the second DC-DC circuit. That is, the second switch is used to determine whether the negative pole of the photovoltaic interface is connected to the negative pole of the first DC-DC circuit, or to determine the conduction between the negative pole of the photovoltaic interface and the negative pole of the second DC-DC circuit. If the first switch is configured to connect the negative pole of the photovoltaic interface to the negative pole of the first DC-DC circuit, then after the positive pole of the photovoltaic interface is connected to the positive pole of the first DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the first DC-DC circuit. Of course, the first switch can also be configured to connect the negative pole of the photovoltaic interface to the negative pole of the second DC-DC circuit. After the positive pole of the photovoltaic interface is connected to the positive pole of the second DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the second DC-DC circuit. Of course, the first switch can also be configured so that the negative pole of the photovoltaic interface is neither connected to the negative pole of the first DC-DC circuit nor to the negative pole of the second DC-DC circuit, that is, the negative pole of the photovoltaic interface is disconnected from both the negative pole of the first DC-DC circuit and the negative pole of the second DC-DC circuit.

[0066] For example, refer to Figure 1 and Figure 3 When the first switch is configured to connect the positive pole of the photovoltaic interface to the positive pole of the first DC-DC circuit, and the second switch is configured to connect the negative pole of the photovoltaic interface to the negative pole of the first DC-DC circuit, the photovoltaic interface is connected to the first DC-DC circuit, and the first DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting. That is, the photovoltaic power generation panel charges the vehicle battery through the first DC-DC circuit.

[0067] For example, refer to Figure 4 and Figure 6 When the first switch is configured to connect the positive pole of the photovoltaic interface with the positive pole of the second DC-DC circuit, and the second switch is configured to connect the negative pole of the photovoltaic interface with the negative pole of the second DC-DC circuit, the photovoltaic interface is connected to the second DC-DC circuit, and the second DC-DC circuit is configured to input the electric energy output by the photovoltaic power generation panel to the vehicle battery after boosting. That is, the photovoltaic power generation panel charges the vehicle battery through the second DC-DC circuit.

[0068] When setting the first switch and the second switch, various methods may be used. Figure 1 and Figure 2, the first switch may be a first single-pole double-throw switch. The common end of the first single-pole double-throw switch is connected to the positive pole of the photovoltaic interface, the first switching end of the first single-pole double-throw switch is connected to the positive pole of the first DC-DC circuit, and the second switching end of the first single-pole double-throw switch is connected to the positive pole of the second DC-DC circuit. Figure 1 and Figure 3 As shown, the common end of the first single-pole double-throw switch is connected to the first switching end by the handle of the first single-pole double-throw switch, so that the positive electrode of the photovoltaic interface is connected to the positive electrode of the first DC-DC circuit; or as Figure 4 and Figure 6 As shown, the common end of the first single-pole double-throw switch is connected to the second switching end through the handle of the first single-pole double-throw switch, so that the positive electrode of the photovoltaic interface is connected to the positive electrode of the second DC-DC circuit.

[0069] Exemplarily, the second switch may be a second single-pole double-throw switch. The common end of the second single-pole double-throw switch is connected to the negative pole of the photovoltaic interface, the first switching end of the second single-pole double-throw switch is connected to the negative pole of the first DC-DC circuit, and the second switching end of the second single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit. Figure 1 and Figure 3 As shown, the common terminal of the first single-pole double-throw switch is connected to the second switching terminal by the handle of the first single-pole double-throw switch, so that the negative electrode of the photovoltaic interface is connected to the negative electrode of the first DC-DC circuit; or as Figure 4 and Figure 6 As shown, the common end of the first single-pole double-throw switch is connected to the second switching end through the handle of the first single-pole double-throw switch, so that the negative pole of the photovoltaic interface is connected to the negative pole of the second DC-DC circuit.

[0070] For example, when the photovoltaic interface is not passed through the PFC circuit in the AC charging circuit, multiple methods can be used. Figure 1 to Figure 6 , the output positive pole of the PFC circuit is connected to the positive pole of the first DC-DC circuit, and the output negative pole of the PFC circuit is connected to the negative pole of the first DC-DC circuit. And the first switching end of the first single-pole double-throw switch is connected to the output positive pole of the PFC circuit and the positive pole of the first DC-DC circuit, and the first switching end of the second single-pole double-throw switch is connected to the output negative pole of the PFC circuit and the negative pole of the first DC-DC circuit. It should be noted that the output positive pole of the PFC circuit is the positive pole of the output bus in the PFC circuit, which is connected to the positive pole in the first DC-DC circuit; the output negative pole of the PFC circuit is the negative pole of the output bus in the PFC circuit, which is connected to the negative pole in the first DC-DC circuit. Thereby, the photovoltaic interface is set to charge the vehicle battery only through the first DC-DC circuit in the AC charging circuit without passing through the PFC circuit.

[0071] At this time, when setting the connection between the AC charging port and the PFC circuit, various methods can be used. For example, in some embodiments, the AC charging port can also have the function of discharging the vehicle battery externally.

[0072] Exemplary, reference Figure 1 to Figure 6 , the AC charging port may include: a first phase line terminal, a second phase line terminal, a third phase line terminal and a negative terminal. The PFC circuit includes: three bridge arms and three inductors. The three bridge arms are respectively the first bridge arm, the second bridge arm and the third bridge arm connected in parallel, and the three inductors are respectively the first inductor, the second inductor and the third inductor. Among them, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the first phase line terminal in a switchable manner; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the second phase line terminal in a switchable manner; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the third phase line terminal in a switchable manner; and the second end of the third inductor is also connected to the negative terminal in a switchable manner.

[0073] Exemplarily, the bridge arm in the AC charging circuit can reuse the bridge arm in the motor controller. For example, the bridge arm in the PFC circuit can reuse the bridge arm in the motor controller to achieve the reuse of the bridge arm, thereby reducing the number of bridge arms. Exemplarily, the three bridge arms in the PFC circuit can reuse the three bridge arms in the motor controller. Of course, part or all of the bridge arms in the first DC-DC circuit can reuse the bridge arms in the motor controller. Exemplarily, part or all of the bridge arms in the second DC-DC circuit in the DC charging circuit can also reuse the bridge arms in the motor controller. Exemplarily, the inductor in the PFC circuit can reuse the windings in the motor. For example, the first inductor, the second inductor and the third inductor in the PFC circuit can reuse the three windings in the motor respectively. Thereby, the windings in the motor are reused and the number of inductors is reduced.

[0074] For example, when an external AC charging pile charges the vehicle battery through an AC charging circuit, refer to Figure 6 When the second end of the first inductor is connected to the first phase line end, the second end of the second inductor is connected to the second phase line end, and the second end of the third inductor is connected to the third phase line end, the AC charging circuit is configured to charge the vehicle battery. That is, the second end of the first inductor can be connected to the first phase line end, the second end of the second inductor can be connected to the second phase line end, and the second end of the third inductor can be connected to the third phase line end, so that the external AC charging pile can charge the vehicle battery with high power.

[0075] Exemplary, reference Figure 4When the vehicle battery is discharged through the AC charging port, the second end of the third inductor can be connected to the negative terminal. At this time, if the second end of the first inductor is connected to the first phase line terminal, or / and the second end of the second inductor is connected to the second phase line terminal, the AC charging circuit is configured to discharge the vehicle battery. Figure 4 In the single-phase discharge connection mode shown, the second end of the third inductor is connected to the negative terminal, and the second end of the first inductor is connected to the first phase line terminal, so that the vehicle battery can discharge to the outside. In other embodiments, the second end of the third inductor can be connected to the negative terminal, and the second end of the second inductor can be connected to the second phase line terminal, which can also enable the vehicle battery to discharge to the outside. In another embodiment, the second end of the third inductor is connected to the negative terminal, the second end of the first inductor is connected to the first phase line terminal, and the second end of the second inductor is connected to the second phase line terminal, which can also enable the vehicle battery to discharge to the outside. At this time, the discharge mode is two-phase discharge, which can support a larger discharge function.

[0076] The following is combined with Figure 1 to Figure 6 , an example of the configuration of the switch component when applying is introduced exemplarily. Figure 1 As shown, the circuit topology of the technical solution for the charging system connected to the photovoltaic power generation panel when the second DC-DC circuit of the DC charging loop adopts a DC / DC boost circuit. Figure 2 As shown, it is a technical solution circuit topology when the second DC-DC circuit of the DC charging loop of the charging system connected to the photovoltaic power generation panel adopts the boost circuit of the motor.

[0077] like Figure 1As shown, the OBC unit (PFC circuit + first DC-DC circuit) in the AC charging circuit and the DC charging circuit are both charging systems that are already standard in the vehicle itself. The AC charging circuit is connected to the AC charging pile to convert AC power into DC power to charge the vehicle battery. The DC charging circuit is connected to the DC charging pile to convert DC power into DC power to charge the vehicle battery. The AC charging circuit includes the front-stage "single-phase / three-phase PFC circuit" and the rear-stage "high-voltage isolated DC / DC circuit (first DC-DC circuit)" and its control system. The front-stage PFC circuit realizes AC / DC conversion, and the rear-stage DC / DC circuit realizes isolation and voltage conversion. The output voltage of the PFC circuit is the input voltage of the high-voltage isolated DC / DC circuit, also known as the PFC bus voltage Vpfc. The AC charging circuit shown in the figure has single-phase charging, three-phase charging, single-phase inverter discharge and three-phase inverter discharge functions at the same time. The DC charging circuit includes a second DC-DC circuit and its control system, and its input terminal voltage is Vb. The voltage of the vehicle battery is Vbat. The output voltage of the photovoltaic panel is Vpv. The technical solution of this embodiment is based on the original charging system of the vehicle. When a photovoltaic panel is added to the charging system, only two additional single-pole double-throw switches S1 and S2 (a first single-pole double-throw switch and a second single-pole double-throw switch) need to be added, thereby improving the reuse rate of the charging system circuit and reducing the additional material cost and system complexity.

[0078] like Figure 2 As shown, Figure 1 The only difference lies in the second DC-DC circuit in the DC charging circuit. The DC charging circuit in this embodiment reuses the vehicle's traction motor, traction motor inverter circuit and its controller as the second DC-DC circuit of the DC charging circuit, thereby further improving the circuit reuse rate of the entire vehicle and further reducing the material cost and system complexity of the entire vehicle.

[0079] exist Figure 1 to Figure 6 In the design concept shown, when reusing the AC charging circuit, only the subsequent "high-voltage isolation DC / DC circuit (second DC-DC circuit)" is reused. It is necessary to lead out a high-voltage DC interface from the busbar of the PFC circuit. It is suitable for occasions where high-power photovoltaic panels are connected, such as when the power level of the AC charging circuit and the photovoltaic panel is 11kW or above.

[0080] Below, Figure 1 Based on the circuit topology shown, taking the DC / DC boost circuit of the second DC-DC circuit of the DC charging loop using the BOOST circuit topology as an example, the working mode and working principle of the vehicle charging system at this time are explained.

[0081] 1. Solar charging working mode: When the vehicle is in driving state or stationary but not plugged in the AC charging gun / DC charging gun, the switching state of S1 and S2 (the first single-pole double-throw switch and the second single-pole double-throw switch) is controlled by the control signal to connect the output end of the photovoltaic panel to the output end of the PFC circuit of the AC charging circuit, or to the input end of the second DC-DC circuit of the DC charging circuit.

[0082] The equivalent circuit diagram when the output end of the photovoltaic panel is connected to the output end of the PFC circuit of the AC charging circuit is as follows: Figure 3 This connection method is suitable for AC charging circuits that do not require inverter discharge.

[0083] The control signals of S1 and S2 (the first single-pole double-throw switch and the second single-pole double-throw switch) come from the power battery management system (BMS), and the BMS sends a control command to the AC charging circuit control system through the CAN communication network to make the AC charging circuit enter the solar charging working mode. The AC charging circuit controls the voltage gain of the high-voltage isolated DC / DC circuit (the first DC-DC circuit) to achieve the output voltage change of the photovoltaic panel to track the maximum output power point (MPPT) of the photovoltaic panel and maintain operation at the maximum power point to achieve solar energy charging of the power battery. The high-voltage isolated DC / DC circuit (the second DC-DC circuit) of the AC charging circuit adopts a bidirectional CLLC resonant circuit, and its power semiconductor switching device operates in a soft switching mode, with low circuit system loss and high power conversion efficiency.

[0084] The equivalent circuit diagram when the output end of the photovoltaic panel is connected to the input end of the second DC-DC circuit of the DC charging circuit is as follows: Figure 4 This connection method is suitable for when the AC charging circuit has a need for inverter discharge. Here, only single-phase inverter discharge is taken as an example.

[0085] The control signals of S1 and S2 (the first single-pole double-throw switch and the second single-pole double-throw switch) come from the power battery management system (BMS), and the BMS sends a control command to the DC control system through the CAN communication network to let its second DC-DC circuit enter the solar charging working mode. The DC controller controls the voltage gain of the second DC-DC circuit to realize the output voltage change of the photovoltaic panel to track the maximum output power point (MPPT) of the photovoltaic panel and keep it running at the maximum power point to realize solar energy charging of the power battery. The second DC-DC circuit of the DC charging loop adopts a bidirectional BOOST circuit, whose power semiconductor switching device works in hard switching mode. The circuit system loss is slightly higher than that of the bidirectional CLLC resonant circuit, and the power conversion efficiency is slightly lower.

[0086] When the vehicle is in motion or stationary but not plugged into an AC charging gun / DC charging gun, in the above two working modes, the photovoltaic panels convert sunlight into electrical energy to efficiently charge the vehicle's on-board battery, truly realizing power replenishment anytime and anywhere without affecting the use of the original inverter function of the AC charging circuit.

[0087] When the control system of the AC charging circuit or the control system of the DC charging circuit enters the above-mentioned solar charging mode, it is necessary to monitor the output power of the photovoltaic panel in real time (using the original voltage and current sampling sensors of the circuit) and run the MPPT algorithm. When the maximum charging power of the photovoltaic panel (after MPPT) is monitored to be lower than a certain value, it is determined that the light environment at that time is in the state of night or cloudy or the sun is blocked, and the photovoltaic panel cannot effectively output power. At this time, the control system of the AC charging circuit or the control system of the DC charging circuit stops the solar charging working mode, and sends the status information to the BMS through the CAN communication network, and finally enters the dormant state to reduce the static power consumption of the whole vehicle until the next time the BMS sends a command through the CAN communication network to wake up the control system of the AC charging circuit or the control system of the DC charging circuit and re-enter the solar charging working mode. The BMS can identify the light environment of the vehicle at that time by adding a light sensor, and can also use the real-time time and weather conditions fed back by the vehicle multimedia system to assist in determining the light environment of the electric vehicle, thereby improving the accuracy of the light environment determination.

[0088] 2. Solar energy and DC charging circuit working mode at the same time: When the vehicle is stationary and the DC charging gun is plugged in, the switch state of S1 and S2 (the first single-pole double-throw switch and the second single-pole double-throw switch) is controlled by the control signal to connect the output end of the photovoltaic panel to the output end of the PFC circuit of the AC charging circuit. The equivalent circuit diagram is as follows Figure 5 shown.

[0089] The control signals of S1 and S2 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the AC charging circuit through the CAN communication network to make the AC charging circuit enter the solar charging working mode. The control system of the AC charging circuit controls the voltage gain of the high-voltage isolation DC / DC circuit (the first DC-DC circuit) to achieve the output voltage change of the photovoltaic panel, so as to track the maximum output power point of the photovoltaic panel (MPPT process) and maintain operation at the maximum power point to realize solar energy charging of the power battery.

[0090] The DC charging port is connected to the DC charging pile by inserting the charging gun. After the control guidance program, the DC charging pile outputs DC power. The control system of the DC charging circuit converts the electric energy output by the DC charging pile into the electric energy of the vehicle battery by controlling the voltage gain of the DC / DC boost circuit (the second DC-DC circuit), thereby realizing high-power DC fast charging.

[0091] In the simultaneous operation mode of solar energy and DC charging, the second DC-DC circuit of the DC charging circuit charges the electric vehicle power battery at full power with the maximum charging power capacity of the established design, while the output power of the photovoltaic panel is used to charge the vehicle battery at maximum power through the high-voltage isolation DC / DC circuit (first DC-DC circuit) of the AC charging circuit. The DC charging circuit of the vehicle is completely independent from the charging circuit of the photovoltaic panel, and is not affected or restricted by each other. The actual power of the vehicle charging is the sum of the DC charging power and the photovoltaic panel charging power, which increases the actual power of the vehicle charging and the charging speed.

[0092] This connection method does not affect the inverter discharge work of the AC charging circuit of the vehicle while the vehicle is performing DC fast charging (such as some models need to be discharged inverted to the discharge socket in the car to meet the charging of electronic devices such as laptops and mobile phones). As long as the high-voltage isolation DC / DC circuit (the first DC-DC circuit) is controlled in the reverse working mode, the PFC circuit is in the inverter mode. However, when in this working mode, the adjustment range of the PFC circuit bus voltage Vpfc is limited by the inverter output AC voltage, that is, the output voltage range of the photovoltaic panel is narrow, and the output power of the solar cell may not be able to track the maximum power point, which may cause a certain amount of power loss.

[0093] 3. Solar power and AC slow charging working mode: When the vehicle is stationary and the AC charging gun is plugged in (taking the three-phase charging mode as an example), the switch state of S1 and S2 is controlled by the control signal, and the output end of the photovoltaic power generation case is connected to the input end of the second DC-DC circuit of the DC charging loop. The equivalent circuit diagram is as follows Figure 6 shown.

[0094] The control signals of S1 and S2 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the DC charging circuit through the CAN communication network, so that its second DC-DC circuit enters the solar charging working mode. The controller of the DC charging circuit controls the voltage gain of the second DC-DC circuit to realize the output voltage change of the photovoltaic panel, so as to track the maximum output power point of the photovoltaic panel (MPPT process) and keep it running at the maximum power point to realize solar energy charging of the power battery.

[0095] The AC charging port is connected to the AC charging pile by inserting the charging gun. After the control guidance program, the AC charging pile outputs AC power. The control system of the AC charging circuit converts the AC voltage into a DC voltage Vpfc by controlling the PFC circuit, and converts the DC power output by the PFC circuit into the power of the vehicle battery by controlling the voltage gain of the high-voltage isolation DC / DC circuit (the first DC-DC circuit), thereby realizing AC charging.

[0096] In the solar and AC charging mode, the PFC circuit and high-voltage isolated DC / DC circuit (first DC-DC circuit) of the AC charging circuit fully charge the vehicle battery with the maximum charging power capacity of the established design, while the output power of the photovoltaic panel is used to charge the vehicle battery with the maximum power through the second DC-DC circuit of the DC charging circuit. The vehicle's AC charging circuit and the photovoltaic panel charging circuit are completely independent and are not affected or restricted by each other. The actual power of the vehicle charging is the sum of the AC charging power and the photovoltaic panel charging power, which increases the actual power of the vehicle charging and the charging speed.

[0097] Exemplarily, the first charging circuit is an AC charging circuit, and the AC charging circuit further includes: an AC charging port, and a PFC circuit connected to the first DC-DC circuit. The second charging circuit is a DC charging circuit, and the DC charging circuit further includes a DC charging port. Figure 7 to Figure 12 The photovoltaic interface shown in the figure charges the vehicle battery through the PFC circuit and the first DC-DC circuit in the AC charging circuit. Based on this design concept, multiple embodiments can also be extended.

[0098] Under this design concept, the AC charging circuit needs to have the function of charging the vehicle battery with the AC charging pile, and also needs to have the function of charging the vehicle battery with the photovoltaic panel, so the PFC circuit needs to be configured with different functions in different situations. For example, when the AC charging pile charges the vehicle battery through the AC charging circuit, the PFC circuit needs to have the function of rectifying AC power into DC power when implementing rectification. When the photovoltaic panel charges the vehicle battery, the current output by the photovoltaic panel is DC power, so the PFC circuit does not need to have the function of rectifying AC power into DC power, but only needs to rectify the input DC power.

[0099] At this time, since the input end of the PFC circuit is connected to both the AC charging port and the photovoltaic interface in an on-off manner, it is possible to set a switch at the input end of the PFC circuit without setting a switch at the photovoltaic interface. Correspondingly, since it is possible not to set a switch at the photovoltaic interface, a switch can be set between the DC charging port and the photovoltaic interface for the on-off connection between the photovoltaic interface and the second DC-DC circuit.

[0100] Exemplary, reference Figure 7 to Figure 12 , the switch component may include a first switch component and a second switch component. Among them, the first switch component is used to configure: the conduction and disconnection between the PFC circuit and the AC charging port, and the conduction and disconnection between the PFC circuit and the photovoltaic interface. That is, the first switch component is arranged between the AC charging port, the input end of the PFC circuit and the photovoltaic interface, and is used to configure whether the PFC circuit is connected to the AC charging port, or the PFC circuit is connected to the photovoltaic interface. When the PFC circuit is connected to the AC charging port, the PFC circuit and the first DC-DC circuit are used to configure the AC power input from the AC charging port to be converted from AC to DC and the voltage is converted to charge the vehicle battery. When the PFC circuit is connected to the photovoltaic interface, the PFC circuit and the first DC-DC circuit are configured to input the electric energy output by the photovoltaic power generation panel into the vehicle battery after boosting.

[0101] The second switch component is used to configure: the conduction and disconnection between the second DC-DC circuit and the DC charging port, and the conduction and disconnection between the second DC-DC circuit and the photovoltaic interface. That is, the second switch component is arranged between the DC charging port, the input end of the second DC-DC circuit and the photovoltaic interface, and is used to configure whether the second DC-DC circuit is connected to the DC charging port, or the second DC-DC circuit is connected to the photovoltaic interface. When the second DC-DC circuit is connected to the DC charging port, the second DC-DC circuit is configured to charge the vehicle battery after the voltage conversion of the DC power input from the DC charging port. When the second DC-DC circuit is connected to the photovoltaic power generation panel, the second DC-DC circuit is configured to charge the vehicle battery after the voltage conversion of the DC power input from the photovoltaic power generation panel.

[0102] When setting the first switch component, various methods can be used. For example, refer to Figure 7 to Figure 12, the first switch component may include: a third switch and a fourth switch. Among them, the third switch is used to configure: the conduction and disconnection between the input positive pole of the PFC circuit and the positive pole of the AC charging port, and the conduction and disconnection between the input positive pole of the PFC circuit and the positive pole of the photovoltaic interface. The third switch is used to determine whether the positive pole of the photovoltaic interface is connected to the input positive pole of the PFC circuit, or to determine the conduction between the positive pole of the AC charging port and the input positive pole of the PFC circuit. If the third switch is configured to connect the positive pole of the photovoltaic interface to the input positive pole of the PFC circuit, then after the negative pole of the photovoltaic interface is connected to the input negative pole of the PFC circuit, the photovoltaic power generation panel can charge the vehicle battery through the PFC circuit and the first DC-DC circuit. Of course, the third switch can also be configured to connect the positive pole of the AC charging port to the input positive pole of the PFC circuit. After the negative pole of the AC charging port is connected to the input negative pole of the PFC circuit, the external AC charging pile can charge the vehicle battery through the PFC circuit and the first DC-DC circuit. Of course, the third switch can also be configured so that the input positive pole of the PFC circuit is neither connected to the positive pole of the photovoltaic interface nor to the positive pole of the AC charging port, that is, the input positive pole of the PFC circuit is disconnected from both the positive pole of the photovoltaic charging port and the positive pole of the AC charging port.

[0103] The fourth switch is used to configure: the conduction and disconnection between the input negative pole of the PFC circuit and the negative pole of the AC charging port, and the conduction and disconnection between the input negative pole of the PFC circuit and the negative pole of the photovoltaic interface. The fourth switch is used to determine whether the negative pole of the photovoltaic interface is connected to the input negative pole of the PFC circuit, or to determine the conduction between the negative pole of the AC charging port and the input negative pole of the PFC circuit. If the fourth switch is configured to connect the negative pole of the photovoltaic interface to the input negative pole of the PFC circuit, then after the positive pole of the photovoltaic interface is connected to the input positive pole of the PFC circuit, the photovoltaic power generation panel can charge the vehicle battery through the PFC circuit and the first DC-DC circuit. Of course, the fourth switch can also be configured to connect the negative pole of the AC charging port to the input negative pole of the PFC circuit. After the positive pole of the AC charging port is connected to the input positive pole of the PFC circuit, the external AC charging pile can charge the vehicle battery through the PFC circuit and the second DC-DC circuit. Of course, the fourth switch can also be configured so that the input negative pole of the PFC circuit is neither connected to the negative pole of the photovoltaic interface nor to the negative pole of the AC charging port, that is, the input negative pole of the PFC circuit is disconnected from both the negative pole of the photovoltaic charging port and the negative pole of the AC charging port.

[0104] When setting the third switch, various methods can be used. For example, refer to Figure 7 to Figure 12The third switch may be a third single-pole double-throw switch. The common end of the third single-pole double-throw switch is connected to the positive input electrode of the PFC circuit, the first switching end of the third single-pole double-throw switch is connected to the positive electrode of the AC charging port, and the second switching end of the third single-pole double-throw switch is connected to the positive electrode of the photovoltaic interface. Fig.10 As shown, the common end of the third single-pole double-throw switch is connected to the first switching end through the handle of the third single-pole double-throw switch, so that the positive electrode of the AC charging port is connected to the input positive electrode of the PFC circuit; as shown Fig. 9 As shown, the common end of the third single-pole double-throw switch is connected to the second switching end through the handle of the third single-pole double-throw switch, so that the positive electrode of the photovoltaic interface is connected to the input positive electrode of the PFC circuit.

[0105] When setting the fourth switch, various methods may be used. For example, refer to Figure 7 to Figure 12 The fourth switch may be a fourth single-pole double-throw switch. The common end of the fourth single-pole double-throw switch is connected to the input cathode of the PFC circuit, the first switching end of the fourth single-pole double-throw switch is connected to the cathode of the AC charging port, and the second switching end of the fourth single-pole double-throw switch is connected to the cathode of the photovoltaic interface. Fig.10 As shown, the common end of the fourth single-pole double-throw switch is connected to the first switching end through the handle of the fourth single-pole double-throw switch, so that the negative electrode of the AC charging port is connected to the input negative electrode of the PFC circuit; as shown Fig. 9 As shown, the common end of the fourth single-pole double-throw switch is connected to the second switching end through the handle of the fourth single-pole double-throw switch, so that the negative electrode of the photovoltaic interface is connected to the input negative electrode of the PFC circuit.

[0106] Exemplary, reference Figure 7 to Figure 12 , the PFC circuit at this time may include: an input positive electrode, an input negative electrode, three bridge arms and three inductors. The three bridge arms are respectively the first bridge arm, the second bridge arm and the third bridge arm connected in parallel, and the three inductors are respectively the first inductor, the second inductor and the third inductor; wherein, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the input positive electrode; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the input positive electrode; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the input negative electrode. That is, in this embodiment, the PFC circuit can only support single-phase AC power when applied to the AC charging process, and cannot support three-phase AC power.

[0107] Exemplarily, the bridge arm in the AC charging circuit can reuse the bridge arm in the motor controller. For example, the bridge arm in the PFC circuit can reuse the bridge arm in the motor controller to achieve the reuse of the bridge arm, thereby reducing the number of bridge arms. Exemplarily, the three bridge arms in the PFC circuit can reuse the three bridge arms in the motor controller. Of course, part or all of the bridge arms in the first DC-DC circuit can reuse the bridge arms in the motor controller. Exemplarily, part or all of the bridge arms in the second DC-DC circuit in the DC charging circuit can also reuse the bridge arms in the motor controller. Exemplarily, the inductor in the PFC circuit can reuse the windings in the motor. For example, the first inductor, the second inductor and the third inductor in the PFC circuit can reuse the three windings in the motor respectively. Thereby, the windings in the motor are reused and the number of inductors is reduced.

[0108] Exemplary, reference Figure 7 to Figure 12 , the AC charging port may include: a phase line terminal and a negative terminal, wherein the input positive pole is connected to the phase line terminal in a switchable manner, and the input negative pole is connected to the negative terminal in a switchable manner; and when the input positive pole is connected to the phase line terminal, and the input negative pole is connected to the negative terminal, the AC charging circuit is configured to charge the vehicle battery. In this embodiment, the phase line terminal in the AC charging port is the positive pole of the AC charging port, and the negative terminal of the AC charging port is the negative pole of the AC charging port.

[0109] When setting the second switch component, various methods can be used. Figure 7 to Figure 12 Here are some examples of how to set it up. Figure 1, the second switch component may include: a fifth switch and a sixth switch. Among them, the fifth switch is used to configure: the conduction and disconnection between the positive pole of the second DC-DC circuit and the positive pole of the DC charging port, and the conduction and disconnection between the positive pole of the second DC-DC circuit and the positive pole of the photovoltaic interface. The fifth switch is used to determine whether the positive pole of the second DC-DC circuit is connected to the positive pole of the photovoltaic interface, or to determine whether the positive pole of the second DC-DC circuit is connected to the positive pole of the DC charging port. If the fifth switch is configured to connect the positive pole of the photovoltaic interface to the positive pole of the second DC-DC circuit, then after the negative pole of the photovoltaic interface is connected to the negative pole of the second DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the second DC-DC circuit. Of course, the fifth switch can also be configured to connect the positive pole of the DC charging port to the positive pole of the second DC-DC circuit. After the negative pole of the DC charging port is connected to the negative pole of the second DC-DC circuit, the external DC charging pile can charge the vehicle battery through the second DC-DC circuit. Of course, the fifth switch can also be configured so that the positive pole of the second DC-DC circuit is neither connected to the positive pole of the photovoltaic interface nor to the positive pole of the DC charging port, that is, the positive pole of the second DC-DC circuit is disconnected from both the positive pole of the photovoltaic charging port and the positive pole of the DC charging port.

[0110] The sixth switch is used to configure: the conduction and disconnection between the negative pole of the second DC-DC circuit and the negative pole of the DC charging port, and the conduction and disconnection between the negative pole of the second DC-DC circuit and the negative pole of the photovoltaic interface. The sixth switch is used to determine whether the negative pole of the second DC-DC circuit is connected to the negative pole of the photovoltaic interface, or to determine whether the negative pole of the second DC-DC circuit is connected to the negative pole of the DC charging port. If the sixth switch is configured to connect the negative pole of the photovoltaic interface to the negative pole of the second DC-DC circuit, then after the positive pole of the photovoltaic interface is connected to the positive pole of the second DC-DC circuit, the photovoltaic power generation panel can charge the vehicle battery through the second DC-DC circuit. Of course, the sixth switch can also be configured to connect the negative pole of the DC charging port to the negative pole of the second DC-DC circuit. After the positive pole of the DC charging port is connected to the positive pole of the second DC-DC circuit, the external DC charging pile can charge the vehicle battery through the second DC-DC circuit. Of course, the sixth switch can also be configured so that the negative pole of the second DC-DC circuit is neither connected to the negative pole of the photovoltaic interface nor to the negative pole of the DC charging port, that is, the negative pole of the second DC-DC circuit is disconnected from both the negative pole of the photovoltaic charging port and the negative pole of the DC charging port.

[0111] When setting the fifth switch, various methods may be used. For example, refer to Figure 7 to Figure 12The fifth switch may be a fifth single-pole double-throw switch, wherein the common end of the fifth single-pole double-throw switch is connected to the positive pole of the second DC-DC circuit, the first switching end of the fifth single-pole double-throw switch is connected to the positive pole of the DC charging port, and the second switching end of the fifth single-pole double-throw switch is connected to the positive pole of the photovoltaic interface. Fig.11 As shown, the common end of the fifth single-pole double-throw switch is connected to the first switching end through the handle of the fifth single-pole double-throw switch, so that the positive electrode of the DC charging port is connected to the positive electrode of the second DC-DC circuit; Fig.10 As shown, the common end of the fifth single-pole double-throw switch is connected to the second switching end through the handle of the fifth single-pole double-throw switch, so that the positive electrode of the photovoltaic interface is connected to the positive electrode of the second DC-DC circuit.

[0112] When setting the sixth switch, various methods may be used. For example, refer to Figure 7 to Figure 12 The sixth switch may be a sixth single-pole double-throw switch. The common end of the sixth single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit, the first switching end of the sixth single-pole double-throw switch is connected to the negative pole of the DC charging port, and the second switching end of the sixth single-pole double-throw switch is connected to the negative pole of the photovoltaic interface. Fig.11 As shown, the common end of the sixth single-pole double-throw switch is connected to the first switching end through the handle of the sixth single-pole double-throw switch, so that the negative electrode of the DC charging port is connected to the negative electrode of the second DC-DC circuit; Fig.10 As shown, the common end of the sixth single-pole double-throw switch is connected to the second switching end through the handle of the sixth single-pole double-throw switch, so that the negative pole of the photovoltaic interface is connected to the negative pole of the second DC-DC circuit.

[0113] The following is combined with Figure 7 to Figure 12 , an example of the configuration of the switch component when applying is introduced exemplarily. Figure 7 As shown, the circuit topology of the technical solution for the charging system connected to the photovoltaic power generation panel when the second DC-DC circuit of the DC charging loop adopts a DC / DC boost circuit. Figure 8 As shown, it is a technical solution circuit topology when the second DC-DC circuit of the DC charging loop of the charging system connected to the photovoltaic power generation panel adopts a motor boost circuit.

[0114] like Figure 7As shown, the OBC unit (PFC circuit + first DC-DC circuit) in the AC charging circuit and the DC charging circuit are both standard charging systems of the vehicle itself. The AC charging circuit is connected to the AC charging pile to convert AC power into DC power to charge the vehicle battery. The DC charging circuit is connected to the DC charging pile to convert DC power into DC power to charge the vehicle battery. The AC charging circuit includes the front-stage "single-phase / three-phase PFC circuit" and the rear-stage "high-voltage isolated DC / DC circuit (first DC-DC circuit)" and its control system. The front-stage PFC circuit realizes AC / DC conversion, and the rear-stage DC / DC circuit realizes isolation and voltage conversion. The output voltage of the PFC circuit is the input voltage of the high-voltage isolated DC / DC circuit, also known as the PFC bus voltage Vpfc. The AC charging circuit shown in the figure has both single-phase charging and single-phase inverter discharge functions. The DC charging circuit includes a second DC-DC circuit and its control system, and its input terminal voltage is Vb. The voltage of the vehicle battery is Vbat. The output voltage of the photovoltaic panel is Vpv. The technical solution of this embodiment is based on the original charging system of the vehicle. When adding a photovoltaic power generation panel to the charging system, it is only necessary to change the AC input switch relays S3 and S4 of the AC charging circuit and the second DC-DC circuit input switch S5 and S6 of the DC charging circuit from the original single-pole single-throw switch to a single-pole double-throw switch. The reuse rate of the charging system unit circuit is improved, and the additional material cost and system complexity are reduced.

[0115] like Figure 8 As shown, Figure 7 The only difference lies in the second DC-DC circuit in the DC charging circuit. The DC charging circuit in this embodiment reuses the vehicle's traction motor, traction motor inverter circuit and its controller as the second DC-DC circuit of the DC charging circuit, thereby further improving the circuit reuse rate of the entire vehicle and further reducing the material cost and system complexity of the entire vehicle.

[0116] exist Figure 7 to Figure 12 In the design idea shown, the front-stage PFC circuit and the rear-stage high-voltage isolation DC / DC circuit (the second DC-DC circuit) are reused when the AC charging circuit is reused, and the S3~S6 switches are changed to single-pole double-throw type. The changes to the AC charging circuit and the DC charging circuit are small, which is suitable for occasions where small-power photovoltaic panels are connected, such as when the power level of the AC charging circuit and the photovoltaic panel is 6.6kW or below.

[0117] Below, Figure 7 Based on the circuit topology shown, taking the DC / DC boost circuit of the second DC-DC circuit of the DC charging loop using the BOOST circuit topology as an example, the working mode and working principle of the vehicle charging system at this time are explained.

[0118] 1. Solar charging working mode: When the vehicle is in driving state or stationary but not plugged into the AC charging gun / DC charging gun, the switch state of S3~S6 is controlled by the control signal to connect the output end of the photovoltaic panel to the AC port input end of the AC charging circuit, or to the input end of the second DC-DC circuit of the DC charging circuit.

[0119] The equivalent circuit diagram when the output end of the photovoltaic panel is connected to the AC port input end of the AC charging circuit is as follows: Fig. 9 This connection method is suitable for AC charging circuits that do not require inverter discharge.

[0120] The control signals of S3 to S6 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the AC charging circuit through the CAN communication network, so that the AC charging circuit enters the solar charging working mode. The control system of the AC charging circuit controls the voltage gain of the PFC circuit to realize the output voltage change of the photovoltaic panel to track the maximum output power point (MPPT) of the photovoltaic panel and keep it running at the maximum power point. At the same time, by controlling the voltage gain of the high-voltage isolated DC / DC circuit (the first DC-DC circuit), the DC power output by the PFC circuit is converted into the power of the vehicle's on-board battery, realizing solar energy charging of the on-board battery.

[0121] The equivalent circuit diagram when the output end of the photovoltaic panel is connected to the input end of the second DC-DC circuit of the DC charging circuit is as follows: Fig.10 This connection method is suitable for AC charging circuits that require inverter discharge.

[0122] The control signals of S3~S6 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the DC charging circuit through the CAN communication network, so that its second DC-DC circuit enters the solar charging working mode. The controller of the DC charging circuit controls the voltage gain of the second DC-DC circuit to achieve the output voltage change of the photovoltaic panel, so as to track the maximum output power point (MPPT) of the photovoltaic panel and keep it running at the maximum power point, so as to realize solar energy charging of the vehicle battery.

[0123] When the vehicle is in motion or stationary but not plugged into an AC charging gun / DC charging gun, the photovoltaic panels in the above two working modes convert sunlight into electrical energy to efficiently charge the vehicle's on-board battery, truly realizing power replenishment anytime and anywhere without affecting the use of the original inverter function of the AC charging circuit.

[0124] When the control system of the AC charging circuit or the control system of the DC charging circuit enters the above-mentioned solar charging mode, it is necessary to monitor the output power of the solar energy in real time (using the original voltage and current sampling sensors of the circuit) and run the MPPT algorithm. When the maximum solar charging power (after MPPT) is monitored to be lower than a certain value, it is determined that the light environment at that time is in the state of night or cloudy or the sun is blocked, and the photovoltaic power generation panel cannot effectively output power. At this time, the control system of the AC charging circuit or the control system of the DC charging circuit stops the solar charging working mode, and sends the status information to the BMS through the CAN communication network, and finally enters the dormant state to reduce the static power consumption of the whole vehicle until the next time the BMS sends a command through the CAN communication network to wake up the control system of the AC charging circuit or the control system of the DC charging circuit and re-enter the solar charging working mode. The BMS can identify the light environment of the vehicle at that time by adding a light sensor, and can also use the real-time time and weather conditions fed back by the vehicle multimedia system to assist in judging the light environment of the vehicle, thereby improving the accuracy of the light environment judgment.

[0125] 2. Solar energy and DC charging working mode: When the vehicle is stationary and the DC charging gun is plugged in, the switch state of S3~S6 is controlled by the control signal to connect the output end of the photovoltaic panel to the AC port input end of the AC charging port. The equivalent circuit diagram is as follows Fig.11 shown.

[0126] The control signals of S3 to S6 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the AC charging circuit through the CAN communication network, so that the AC charging circuit enters the solar charging working mode. The control system of the AC charging circuit controls the voltage gain of the PFC circuit to realize the output voltage change of the photovoltaic panel to track the maximum output power point (MPPT) of the photovoltaic panel and keep it running at the maximum power point. At the same time, by controlling the voltage gain of the high-voltage isolated DC / DC circuit (the first DC-DC circuit), the DC power output by the PFC circuit is converted into the power of the vehicle's on-board battery, realizing solar energy charging of the on-board battery.

[0127] The DC charging port is connected to the DC charging pile by inserting the charging gun. After the control guidance program, the DC charging pile outputs DC power. The DC control system converts the electric energy output by the DC charging pile into the electric energy of the vehicle's on-board battery by controlling the voltage gain of the DC / DC boost circuit (the second DC-DC circuit), thereby realizing high-power DC charging.

[0128] In the solar and DC charging mode, the second DC-DC circuit of the DC charging circuit charges the vehicle battery at full power with the maximum charging power capacity of the established design, while the output power of the photovoltaic panel charges the vehicle battery at maximum power through the PFC circuit of the AC charging circuit and the high-voltage isolation DC / DC circuit (first DC-DC circuit). The vehicle's DC fast charging circuit and the photovoltaic panel charging circuit are completely independent and are not affected or restricted by each other; the actual charging power of the vehicle is the sum of the DC charging power and the photovoltaic panel charging power, which increases the actual charging power of the vehicle and the charging speed.

[0129] 3. Solar energy and AC charging working mode: When the vehicle is stationary and the AC charging gun is plugged in, the switch state of S3~S6 is controlled by the control signal to connect the output of the photovoltaic panel to the input of the second DC-DC circuit of the DC charging loop. The equivalent circuit diagram is as follows Fig.12 shown.

[0130] The control signals of S3 to S6 come from the power battery management system (BMS), and the BMS sends control commands to the control system of the DC charging circuit through the CAN communication network, so that its DC / DC boost circuit (second DC-DC circuit) enters the solar charging working mode. The DC controller controls the voltage gain of the DC / DC boost circuit (second DC-DC circuit) to achieve the output voltage change of the photovoltaic panel to track the maximum output power point of the photovoltaic panel (MPPT process), and maintains operation at the maximum power point to achieve solar energy charging of the vehicle battery.

[0131] The AC charging port is connected to the AC charging pile by inserting the charging gun. After the control guidance program, the AC charging pile outputs AC power. The control system of the AC charging circuit converts the AC voltage into a DC voltage Vpfc by controlling the PFC circuit, and converts the DC power output by the PFC circuit into the power of the electric vehicle power battery by controlling the voltage gain of the high-voltage isolation DC / DC circuit (the first DC-DC circuit), thereby realizing AC charging.

[0132] In the solar and AC charging simultaneous working mode, the PFC circuit and high-voltage isolated DC / DC circuit (first DC-DC circuit) of the AC charging circuit fully charge the vehicle's on-board battery with the maximum charging power capacity of the established design, while the output power of the photovoltaic panel is used to charge the vehicle's on-board battery at maximum power through the DC charging circuit's DC / DC boost circuit (second DC-DC circuit). The vehicle's AC charging circuit and the photovoltaic panel's charging circuit are completely independent and are not affected or restricted by each other. The actual power of the vehicle's charging is the sum of the AC charging power and the photovoltaic panel's charging power, which increases the actual charging power of the vehicle and the charging speed.

[0133] In the various embodiments shown above, the photovoltaic interface is connected to the first charging circuit and the second charging circuit in an on-off manner; when the photovoltaic interface is connected to the first charging circuit, the photovoltaic panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic panel supplies power to the vehicle battery through the second charging circuit. Thus, the reuse of the two charging circuits is achieved, and there is no need to set up an additional DC boost circuit, which reduces costs.

[0134] In some of the above embodiments, the photovoltaic interface is configured to be connected to the first DC-DC circuit in the AC charging circuit, or to be connected to the second DC-DC circuit in the DC charging circuit through the switch component. When the switch component is configured so that the photovoltaic interface is connected to the first DC-DC circuit, the first DC-DC circuit is configured to input the electric energy output by the photovoltaic panel to the vehicle battery after boosting; when the switch component is configured so that the photovoltaic interface is connected to the second DC-DC circuit, the second DC-DC circuit is configured to input the electric energy output by the photovoltaic panel to the vehicle battery after boosting. This enables the reuse of the DC-DC circuit in the AC charging circuit or the DC charging circuit, without the need to set up an additional DC boost circuit, thereby reducing costs.

[0135] In application, based on the circuit topology shown in the embodiment of the present application, the operating scenario characteristics that electric vehicles do not use the AC charging circuit and the DC charging circuit to charge the vehicle battery at the same time can be used. In some embodiments, the photovoltaic interface of the photovoltaic power generation panel is selectively connected to the first DC-DC circuit of the existing AC charging circuit or the second DC-DC circuit of the DC charging circuit through the first single-pole double-throw switch and the second single-pole double-throw switch. By injecting appropriate control strategies into the single-pole double-throw switch, the existing AC control system and the existing DC control system, three operating conditions can be achieved: solar energy charging the vehicle battery, AC charging circuit and solar energy charging the vehicle battery at the same time, and DC charging circuit and solar energy charging the vehicle battery at the same time. Under these three operating conditions, the maximum power point tracking of the photovoltaic power generation panel can be achieved, the utilization rate of the photovoltaic power generation panel can be improved, and there is no need to add an additional DC-DC conversion circuit at the photovoltaic interface end of the photovoltaic power generation panel, which reduces the material cost and system complexity of the whole vehicle. Compared with the related art, in the solution disclosed in this embodiment, when the AC charging circuit and solar energy charge the vehicle battery at the same time, the total charging power is not limited by the charging power of the AC charging circuit; when the DC charging circuit and solar energy charge the vehicle battery at the same time, the total charging power is not limited by the charging power of the DC charging circuit, which truly improves the actual charging power of the electric vehicle and improves the charging speed.

[0136] In addition, the new embodiment of the present application also provides a vehicle-mounted circuit system, which includes: a vehicle-mounted battery, a photovoltaic power generation panel, and any of the above-mentioned charging systems; wherein the vehicle-mounted battery is connected to the first charging circuit and the second charging circuit, and the photovoltaic interface is connected to the photovoltaic power generation panel. The vehicle-mounted battery can adopt various types of batteries. For example, the vehicle-mounted battery can be a power battery that provides driving force for the vehicle, or it can be an energy storage battery. There are many ways to set up the vehicle-mounted battery. Exemplarily, the vehicle-mounted battery can include a battery pack consisting of a plurality of cells connected in series or in parallel. The type of cell can be such as but not limited to a blade cell, a cylindrical cell, etc. The connection between the photovoltaic power generation panel and the photovoltaic interface can be in a variety of ways. Exemplarily, in some embodiments, a plug-in connection method can be adopted between the photovoltaic power generation panel and the photovoltaic interface, and the plug-in can be various types of plug connectors. In some embodiments, the photovoltaic power generation panel and the photovoltaic interface can also be connected by pin welding, pad welding or wire welding.

[0137] In addition, the embodiment of the present application further provides a vehicle, which includes any one of the above-mentioned vehicle-mounted circuit systems. The vehicle can be an electric vehicle such as, but not limited to, a two-wheeled electric bicycle, a three-wheeled electric vehicle, a four-wheeled electric vehicle, or the like.

[0138] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A charging system, characterized in that: include: A first charging circuit, used for connecting to a vehicle battery; A second charging circuit, used to connect to the vehicle battery; A photovoltaic interface, used to connect to a photovoltaic power generation panel and to be connected to the first charging circuit and the second charging circuit in an on-off manner; When the photovoltaic interface is connected to the first charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the first charging circuit; when the photovoltaic interface is connected to the second charging circuit, the photovoltaic power generation panel supplies power to the vehicle battery through the second charging circuit.

2. The charging system according to claim 1, characterized in that: The first charging circuit is an AC charging circuit, and the second charging circuit is a DC charging circuit; When the photovoltaic power generation panel supplies power to the vehicle battery through the second charging circuit, the first charging circuit is connected to the AC charging port, and the AC charging device connected to the AC charging port supplies power to the vehicle battery through the AC charging circuit at the same time; When the photovoltaic power generation panel supplies power to the vehicle battery through the first charging circuit, the second charging circuit is connected to the DC charging port, and the DC charging device connected to the DC charging port simultaneously supplies power to the vehicle battery through the DC charging circuit.

3. The charging system according to claim 1, characterized in that: The first charging circuit includes a first DC-DC circuit for connecting to the vehicle battery, and the second charging circuit includes a second DC-DC circuit for connecting to the vehicle battery; The charging system further includes: a switch component configured to: control the conduction and disconnection between the photovoltaic interface and the first DC-DC circuit, and control the conduction and disconnection between the photovoltaic interface and the second DC-DC circuit; Wherein, when the switch assembly is configured to conduct the photovoltaic interface with the first DC-DC circuit, the first DC-DC circuit is configured to input the electric energy output by the photovoltaic panel into the vehicle-mounted battery after boosting; When the switch component is configured to conduct the photovoltaic interface with the second DC-DC circuit, the second DC-DC circuit is configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery.

4. The charging system according to claim 3, characterized in that: The switch assembly includes: a first switch and a second switch; Wherein, the first switch is configured to: control the conduction and disconnection between the positive electrode of the photovoltaic interface and the positive electrode of the first DC-DC circuit, and control the conduction and disconnection between the positive electrode of the photovoltaic interface and the positive electrode of the second DC-DC circuit; The second switch is configured to control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the first DC-DC circuit, and to control the conduction and disconnection between the negative pole of the photovoltaic interface and the negative pole of the second DC-DC circuit.

5. The charging system according to claim 4, characterized in that: The first switch is a first single-pole double-throw switch, and the second switch is a second single-pole double-throw switch; The common end of the first single-pole double-throw switch is connected to the positive electrode of the photovoltaic interface, the first switching end of the first single-pole double-throw switch is connected to the positive electrode of the first DC-DC circuit, and the second switching end of the first single-pole double-throw switch is connected to the positive electrode of the second DC-DC circuit; The common end of the second single-pole double-throw switch is connected to the negative pole of the photovoltaic interface, the first switching end of the second single-pole double-throw switch is connected to the negative pole of the first DC-DC circuit, and the second switching end of the second single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit.

6. The charging system according to claim 5, characterized in that: The first charging circuit is an AC charging circuit, and the AC charging circuit further includes: a PFC circuit, and an AC charging port that can be connected to the PFC circuit; Wherein, the output positive electrode of the PFC circuit is connected to the positive electrode of the first DC-DC circuit, and the output negative electrode of the PFC circuit is connected to the negative electrode of the first DC-DC circuit; The first switching end of the first single-pole double-throw switch is connected to the output positive electrode of the PFC circuit and the positive electrode of the first DC-DC circuit, and the first switching end of the second single-pole double-throw switch is connected to the output negative electrode of the PFC circuit and the negative electrode of the first DC-DC circuit.

7. The charging system according to claim 6, characterized in that: The AC charging port includes: a first phase line terminal, a second phase line terminal, a third phase line terminal and a negative terminal; The PFC circuit comprises: three bridge arms and three inductors; the three bridge arms are respectively a first bridge arm, a second bridge arm and a third bridge arm connected in parallel, and the three inductors are respectively a first inductor, a second inductor and a third inductor; Among them, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the first phase line end in a switchable manner; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the second phase line end in a switchable manner; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the third phase line end in a switchable manner; and the second end of the third inductor is also connected to the negative terminal in a switchable manner.

8. The charging system according to claim 7, characterized in that: When the second end of the first inductor is connected to the first phase line terminal, the second end of the second inductor is connected to the second phase line terminal, and the second end of the third inductor is connected to the third phase line terminal, the AC charging circuit is configured to charge the vehicle battery; When the second end of the third inductor is connected to the negative terminal, if the second end of the first inductor is connected to the first phase line terminal, or / and, the second end of the second inductor is connected to the second phase line terminal, the AC charging circuit is configured to discharge the vehicle battery to the outside.

9. The charging system according to claim 4, characterized in that: The second charging circuit is a DC charging circuit, and the DC charging circuit further includes: a DC charging port that can be connected to the second DC-DC circuit.

10. The charging system according to claim 3, characterized in that: The first charging circuit is an AC charging circuit, and the AC charging circuit further includes: an AC charging port, and a PFC circuit connected to the first DC-DC circuit; the second charging circuit is a DC charging circuit, and the DC charging circuit further includes a DC charging port; The switch assembly includes a first switch assembly and a second switch assembly; Wherein, the first switch component is configured to: turn on and off the PFC circuit and the AC charging port, and turn on and off the PFC circuit and the photovoltaic interface; and when the PFC circuit and the photovoltaic interface are turned on, the PFC circuit and the first DC-DC circuit are configured to boost the electric energy output by the photovoltaic panel and input it to the vehicle battery; The second switch component is configured to: turn on and off the second DC-DC circuit and the DC charging port, and turn on and off the second DC-DC circuit and the photovoltaic interface.

11. The charging system according to claim 10, characterized in that: The first switch assembly includes: a third switch and a fourth switch; The third switch is configured to: turn on and off the input positive pole of the PFC circuit and the positive pole of the AC charging port, and turn on and off the input positive pole of the PFC circuit and the positive pole of the photovoltaic interface; The fourth switch is configured to: connect and disconnect the input negative pole of the PFC circuit and the negative pole of the AC charging port, and connect and disconnect the input negative pole of the PFC circuit and the negative pole of the photovoltaic interface.

12. The charging system according to claim 11, characterized in that: The third switch is a third single-pole double-throw switch, and the fourth switch is a fourth single-pole double-throw switch; The common end of the third single-pole double-throw switch is connected to the input positive pole of the PFC circuit, the first switching end of the third single-pole double-throw switch is connected to the positive pole of the AC charging port, and the second switching end of the third single-pole double-throw switch is connected to the positive pole of the photovoltaic interface; The common end of the fourth single-pole double-throw switch is connected to the input negative pole of the PFC circuit, the first switching end of the fourth single-pole double-throw switch is connected to the negative pole of the AC charging port, and the second switching end of the fourth single-pole double-throw switch is connected to the negative pole of the photovoltaic interface.

13. The charging system according to any one of claims 10 to 12, characterized in that: The PFC circuit comprises: an input positive electrode, an input negative electrode, three bridge arms and three inductors; the three bridge arms are respectively a first bridge arm, a second bridge arm and a third bridge arm connected in parallel, and the three inductors are respectively a first inductor, a second inductor and a third inductor; Among them, the first end of the first inductor is connected to the midpoint of the first bridge arm, and the second end of the first inductor is connected to the input positive electrode; the first end of the second inductor is connected to the midpoint of the second bridge arm, and the second end of the second inductor is connected to the input positive electrode; the first end of the third inductor is connected to the midpoint of the third bridge arm, and the second end of the third inductor is connected to the input negative electrode.

14. The charging system according to claim 13, characterized in that: The AC charging port includes: a phase line terminal and a negative terminal, wherein the input positive pole is connected to the phase line terminal in an on-off manner, and the input negative pole is connected to the negative terminal in an on-off manner; When the input positive electrode is connected to the phase line terminal and the input negative electrode is connected to the negative terminal, the AC charging circuit is configured to charge the vehicle-mounted battery.

15. The charging system according to claim 10, characterized in that: The second switch assembly includes: a fifth switch and a sixth switch; The fifth switch is configured to: turn on and off the positive electrode of the second DC-DC circuit and the positive electrode of the DC charging port, and turn on and off the positive electrode of the second DC-DC circuit and the positive electrode of the photovoltaic interface; The sixth switch is configured to: connect and disconnect the negative pole of the second DC-DC circuit and the negative pole of the DC charging port, and connect and disconnect the negative pole of the second DC-DC circuit and the negative pole of the photovoltaic interface.

16. The charging system according to claim 15, characterized in that: The fifth switch is a fifth single-pole double-throw switch, and the sixth switch is a sixth single-pole double-throw switch; The common end of the fifth single-pole double-throw switch is connected to the positive pole of the second DC-DC circuit, the first switching end of the fifth single-pole double-throw switch is connected to the positive pole of the DC charging port, and the second switching end of the fifth single-pole double-throw switch is connected to the positive pole of the photovoltaic interface; The common end of the sixth single-pole double-throw switch is connected to the negative pole of the second DC-DC circuit, the first switching end of the sixth single-pole double-throw switch is connected to the negative pole of the DC charging port, and the second switching end of the sixth single-pole double-throw switch is connected to the negative pole of the photovoltaic interface.

17. A vehicle-mounted circuit system, characterized in that: include: A vehicle-mounted battery, a photovoltaic power generation panel, and a charging system as claimed in any one of claims 1 to 16; wherein the vehicle-mounted battery is connected to the first charging circuit and the second charging circuit, and the photovoltaic interface is connected to the photovoltaic power generation panel.

18. A vehicle, characterized in that: Comprising the vehicle-mounted circuit system as claimed in claim 17.

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