AC-DC Integrated Charging System and Its Control Method

Abstract

The present invention discloses an integrated AC-DC charging system and its control method, which includes an AC-DC charging stand, a cable, an on-vehicle charger, and a power battery. The AC-DC charging stand includes an AC interface and a DC interface. At least one AC terminal is arranged in the AC interface, and at least one DC terminal is arranged in the DC interface. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end, and the common output end is sequentially connected to the on-vehicle charger and the power battery through the cable; the on-vehicle charger is configured such that the current identification module executes an AC charging mode or a DC charging mode according to the current waveform identified by the current identification module. Among them, the AC charging mode or the DC charging mode is to charge the power battery through the AC charging management unit or the DC charging management unit respectively. In the present invention, the AC and DC outputs of the AC-DC charging stand share the same line, reducing the usage of charging harnesses and the number of accessories on the harness, and greatly reducing the cost.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive connectors, and particularly to an AC / DC integrated charging system and its control method. Background Art

[0002] With the rapid development of new energy technologies, electric vehicles have become popular. Currently, there are many charging interface standards for charging seats in the market, such as national standards, European standards, or American standards. In addition, there are DC charging interfaces and AC charging interfaces. Therefore, in order for electric vehicles to adapt to multiple charging interfaces, automotive charging sockets generally integrate AC interfaces and DC interfaces, and the AC interface and the DC interface are respectively connected to the charger and the vehicle-mounted battery by cables. Due to the large charging current, the wire diameter of the charging harness cable is relatively thick, and the number of accessories for auxiliary assembly on the charging harness is also very large, which greatly increases the weight and cost of the charging harness.

[0003] Therefore, there is an urgent need for a new technical solution to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an AC / DC integrated charging system and its control method, which can solve the problems of large consumption of charging harnesses and a large number of accessories on the harness, resulting in waste of costs.

[0005] The present invention provides an AC / DC integrated charging system, including an AC / DC charging seat, a cable, a vehicle-mounted charger, and a power battery.

[0006] The AC / DC charging seat includes an AC interface and a DC interface. At least one AC terminal for accessing alternating current is provided in the AC interface, and at least one DC terminal for accessing direct current is provided in the DC interface. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end, and the common output end is connected to the vehicle-mounted charger through the cable. The output end of the vehicle-mounted charger is connected to the power battery.

[0007] The vehicle-mounted charger is integrated with a current identification module, a DC charging management unit, and an AC charging management unit. The vehicle-mounted charger is configured to obtain the current waveform of the common output end by the current identification module and execute an AC charging mode or a DC charging mode according to the current waveform. Among them, the AC charging mode or the DC charging mode is to charge the power battery through the AC charging management unit or the DC charging management unit respectively.

[0008] Preferably, the AC terminal includes an AC negative terminal, an AC PE terminal, and an AC positive terminal, the DC terminal includes a DC negative terminal, a DC PE terminal, and a DC positive terminal, the output end of the AC positive terminal is transferred to the output end of the DC positive terminal through a first transfer structure, the output end of the AC negative terminal is transferred to the output end of the DC negative terminal through a second transfer structure, the output end of the AC PE terminal is transferred to the output end of the DC PE terminal through a third transfer structure, and the output ends of the DC positive terminal, the DC negative terminal, and the DC PE terminal together form the common output terminal.

[0009] Preferably, each of the first transfer structure, the second transfer structure, and the third transfer structure is any one or a combination of a transfer row or a transfer wire.

[0010] Preferably, the AC terminal includes an AC negative terminal, an AC PE terminal, and an AC positive terminal, the DC terminal includes a DC negative terminal, a DC PE terminal, and a DC positive terminal, the output end of the AC positive terminal and the output end of the DC positive terminal are connected through a first output structure, the output end of the AC negative terminal and the output end of the DC negative terminal are connected through a second output structure, the output end of the AC PE terminal and the DC PE terminal are connected through a third output structure, and the first output structure, the second output structure, and the third output structure together form the common output terminal.

[0011] Preferably, each of the first output structure, the second output structure, and the third output structure is any one or a combination of a transfer row or a transfer wire.

[0012] Preferably, the common output terminal is connected to the input end of the current identification module through the cable, the DC charging management unit and the AC charging management unit are connected in parallel, the output end of the current identification module is respectively connected to the input ends of the DC charging management unit and the AC charging management unit, and the output ends of the DC charging management unit and the AC charging management unit are connected to the power battery.

[0013] Preferably, between the output ends of the DC charging management unit and the AC charging management unit and the power battery, a high-voltage distribution unit and a BMS are sequentially connected in series.

[0014] Preferably, the AC charging management unit integrates a rectifier and converts the alternating current output from the common terminal into direct current through the rectifier.

[0015] Preferably, the DC charging management unit includes a buck circuit and a control module. The buck circuit includes a first input capacitor, a first power switch, a first diode, a first inductor, and a first output capacitor. The first input capacitor is connected between the positive and negative poles of the input voltage of the buck circuit, and the first output capacitor is connected between the positive and negative poles of the output voltage of the buck circuit. The first diode is connected in parallel between the first input capacitor and the first output capacitor. The base of the first power switch is connected to the output terminal of the control module, the collector of the first power switch is connected to the positive pole of the input voltage, the emitter of the first power switch is connected to one end of the first inductor, the other end of the first inductor is connected to the positive pole of the output voltage, the anode of the first diode is connected between the negative pole of the input voltage and the negative pole of the output voltage, and the cathode of the first diode is connected between the emitter of the power switch and the first inductor.

[0016] Preferably, the DC charging management unit includes a boost circuit and a control module. The boost circuit includes a second input capacitor, a second power switch, a second diode, a second inductor, and a second output capacitor. The second input capacitor is connected between the positive and negative poles of the input voltage of the boost circuit, and the second output capacitor is connected between the positive and negative poles of the output voltage of the boost circuit. The second power switch is connected in parallel between the second input capacitor and the second output capacitor. The base of the second power switch is connected to the output terminal of the control module, the collector of the second power switch is connected to one end of the second inductor and the anode of the second diode, the emitter of the second power switch is connected to the negative pole of the input voltage and the negative pole of the output voltage, the other end of the second inductor is connected to the positive pole of the input voltage, and the cathode of the second diode is connected to the positive pole of the output voltage.

[0017] Preferably, the control module is configured to control the on / off of the first power switch or the second power switch.

[0018] Preferably, the first power switch is any one of an N-channel insulated gate field effect transistor, a P-channel field effect transistor, an NPN transistor, a PNP transistor, or an insulated gate bipolar transistor; and / or

[0019] The first diode is a Schottky diode.

[0020] Preferably, the second power switch is any one of an N-channel insulated gate field effect transistor, a P-channel field effect transistor, an NPN transistor, a PNP transistor, or an insulated gate bipolar transistor; and / or

[0021] The second diode is a Schottky diode.

[0022] On the other hand, this article provides a control method applied to the AC-DC integrated charging system described in any of the above embodiments. The AC-DC integrated charging system includes an AC-DC charging stand, a cable, an on-vehicle charger, and a power battery.

[0023] The AC-DC charging stand includes an AC interface and a DC interface. At least one AC terminal for accessing alternating current is provided in the AC interface, and at least one DC terminal for accessing direct current is provided in the DC interface. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end. The common output end is connected to the on-vehicle charger through the cable, and the output end of the on-vehicle charger is connected to the power battery. The on-vehicle charger is integrated with a current identification module, a DC charging management unit, and an AC charging management unit.

[0024] The control method includes:

[0025] The on-vehicle charger obtains a current waveform by the current identification module and executes different charging modes according to the current waveform.

[0026] If the current waveform obtained by the current identification module is an alternating current waveform, the alternating current is converted into direct current by the AC charging management unit and then supplied to the power battery.

[0027] If the current waveform obtained by the current identification module is a direct current waveform, the power battery is supplied with power by the DC charging management unit.

[0028] Preferably, the charging mode includes a charging current type and a charging communication protocol type.

[0029] Preferably, the DC charging management unit includes a buck circuit. The control method includes: the DC charging management unit converts the high-voltage power from the AC-DC charging stand into the preset required electric energy required by the power battery through the buck circuit, and then supplies the preset required electric energy to the power battery.

[0030] Preferably, the DC charging management unit includes a boost circuit. The control method includes: the DC charging management unit converts the low-voltage power from the AC-DC charging stand into the preset required electric energy required by the power battery through the boost circuit, and then supplies the preset required electric energy to the power battery.

[0031] Preferably, the AC charging management unit is integrated with a rectifier. The control method includes: the rectifier converts the alternating current output from the common end into direct current and then supplies the direct current to the power battery.

[0032] Preferably, the AC / DC integrated charging system communicates with the vehicle via CAN, and the control method includes: the on-vehicle charger communicates with and controls the vehicle via the current identification module to perform AC charging or DC charging operations.

[0033] After the current identification module identifies the AC signal of the alternating current or the DC signal of the direct current, it uploads the AC signal or the DC signal to the vehicle CAN bus, and the AC charging management unit converts the alternating current to direct current to perform the DC charging operation, or the DC charging management unit directly performs the DC charging operation.

[0034] Advantages of the present invention:

[0035] In this design, the output ends of the AC terminals in the AC interface and the output ends of the DC terminals in the DC interface of the AC / DC charging socket are respectively connected to form a common output terminal. The common output terminal is sequentially connected to the on-vehicle charger and the power battery through a cable. The output cables of the output ends of the AC terminals or the DC terminals are cancelled, and only the cable is connected at the common output terminal. The AC and DC share the same line, reducing the amount of charging harness and the number of all harness accessories such as cable ties, tapes, and brackets used for the harness, and greatly reducing the cost.

[0036] The on-vehicle charger integrates a current identification module, a DC charging management unit, and an AC charging management unit. The on-vehicle charger obtains the current waveform of the common output terminal according to the current identification module and executes the AC charging mode or the DC charging mode. The on-vehicle charger has the charging management function of integrating the DC charging management unit and the AC charging management unit into one.

[0037] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings incorporated in and forming a part of this specification illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0039] Figure 1 It is a structural principle block diagram of the AC / DC integrated charging system of the present invention.

[0040] Figure 2 It is a connection schematic diagram of the AC / DC integrated charging system of the present invention.

[0041] Figure 3 It is a structural schematic diagram of the AC interface and the DC interface of the present invention.

[0042] Figure 4This is a schematic diagram of a structure in which the output ends of the AC terminal and the DC terminal of the present invention are respectively connected to form a common output end.

[0043] Figure 5 This is another schematic diagram of a structure in which the output ends of the AC terminal and the DC terminal of the present invention are respectively connected to form a common output end.

[0044] Figure 6 This is a circuit schematic diagram of the buck circuit of the DC charging management unit of the present invention.

[0045] Figure 7 This is a circuit schematic diagram of the boost circuit of the DC charging management unit of the present invention.

[0046] The markings in the figure are as follows: 1, AC / DC charging socket; 11, AC interface; 12, DC interface; 111, AC positive terminal; 112, AC negative terminal; 113, AC PE terminal; 121, DC positive terminal; 122, DC negative terminal; 123, DC PE terminal; 13, first transfer structure; 14, second transfer structure; 15, third transfer structure; 16, first output structure; 17, second output structure; 18, third output structure.

[0047] Explanation of the reference symbols in the drawings:

[0048] Cin1, first input capacitor; Q1, first power switch tube;

[0049] D1, first diode; L1, first inductor;

[0050] Cout1, first output capacitor; Cin2, second input capacitor;

[0051] Q2, second power switch tube; D2, second diode;

[0052] L2, second inductor; Cout2, second output capacitor. Detailed implementation manners

[0053] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, the numerical expressions and values do not limit the scope of the present invention.

[0054] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present invention and its application or use.

[0055] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0056] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0057] An integrated AC / DC charging system, such as Figures 1-5 as shown, includes: an AC / DC charging dock 1, a cable, an on-vehicle charger, and a power battery.

[0058] The AC / DC charging dock 1 includes an AC interface 11 and a DC interface 12. At least one AC terminal for accessing alternating current is provided inside the AC interface 11, and at least one DC terminal for accessing direct current is provided inside the DC interface 12. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end. The common output end is connected to the on-vehicle charger through the cable, and the output end of the on-vehicle charger is connected to the power battery.

[0059] The on-vehicle charger is integrated with a current identification module, a DC charging management unit, and an AC charging management unit. The on-vehicle charger is configured to obtain the current waveform of the common output end by the current identification module and execute an AC charging mode or a DC charging mode according to the current waveform. Wherein, the AC charging mode or the DC charging mode is to charge the power battery through the AC charging management unit or the DC charging management unit respectively.

[0060] With the rapid development of new energy technologies, electric vehicles have become popular. There are many charging interface standards for charging docks in the current market, such as national standards, European standards, or American standards. In addition, there are also DC charging interfaces and AC charging interfaces. Therefore, in order to adapt to various charging interfaces, automotive charging sockets generally integrate an AC interface 11 and a DC interface 12, and the AC interface 11 and the DC interface 12 are respectively connected to the charger and the on-vehicle battery by cables. Due to the large charging current, the wire diameter of the cable of the charging harness is relatively thick, and the number of accessories for auxiliary assembly on the charging harness is also very large, which greatly increases the weight and cost of the charging harness.

[0061] The output ends of the AC terminals in the AC interface 11 of the AC-DC charging socket 1 of this design and the output ends of the DC terminals in the DC interface 12 are respectively connected to form a common output end. The common output end is sequentially connected to the on-vehicle charger and the power battery through a cable. The output cables of the output ends of the AC terminals or the output ends of the DC terminals are cancelled, and only the cable is connected to the common output end. The AC and DC share the same line, reducing the usage amount of the charging harness and the quantity of all harness accessories such as cable ties, tapes, and brackets used for the harness, greatly reducing the cost. The on-vehicle charger integrates a current identification module, a DC charging management unit, and an AC charging management unit. The on-vehicle charger obtains the current waveform of the common output end according to the current identification module and executes the AC charging mode or the DC charging mode. The on-vehicle charger has a charging management function that combines the DC charging management unit and the AC charging management unit into one.

[0062] Preferably, as Figure 4 shown, the AC terminals include an AC negative terminal 112, an AC PE terminal 113, and an AC positive terminal 111. The DC terminals include a DC negative terminal 122, a DC PE terminal 123, and a DC positive terminal 121. The output end of the AC positive terminal 111 is transferred to the output end of the DC positive terminal 121 through a first transfer structure 13. The output end of the AC negative terminal 112 is transferred to the output end of the DC negative terminal 122 through a second transfer structure 14. The output end of the AC PE terminal 113 is transferred to the output end of the DC PE terminal 123 through a third transfer structure 15. The output ends of the DC positive terminal 121, the DC negative terminal 122, and the DC PE terminal 123 together form the common output end.

[0063] The output ends of the AC terminals are transferred to the output ends of the DC terminals through a transfer structure. Only the output ends of the DC positive terminal 121, the DC negative terminal 122, and the DC PE terminal 123 of the DC terminals together form the common output end and are connected to the on-vehicle charger through a cable. The output end of the on-vehicle charger is connected to the power battery, which can reduce the number of AC cables connected to the output ends of the AC terminals and all accessories such as cable ties, tapes, and brackets used for the cables, greatly reducing the cost.

[0064] Preferably, the first transfer structure 13, the second transfer structure 14, and the third transfer structure 15 are any one or a combination of transfer rows or transfer wires.

[0065] The first transfer structure 13, the second transfer structure 14, and the third transfer structure 15 all adopt conductive transfer rows or transfer wires.

[0066] The transfer busbar can be a copper busbar or an aluminum busbar. The copper busbar, also known as the copper bus or copper busbar, is made of copper and is a long conductor with a rectangular or chamfered (rounded) rectangular cross-section (usually a rounded copper busbar to avoid tip discharge). It is a high-current conducting product that plays the role of transmitting current and making electrical connections in a circuit.

[0067] Aluminum busbar: It is a long aluminum product with a rectangular cross-section made of aluminum and its alloys, and is sometimes also called the busbar.

[0068] The transfer wire is a conductive cable used to connect the AC terminal and the DC terminal.

[0069] Preferably, as Figure 5 shown, the AC terminal includes an AC negative terminal 112, an AC PE terminal 113, and an AC positive terminal 111. The DC terminal includes a DC negative terminal 122, a DC PE terminal 123, and a DC positive terminal 121. The output end of the AC positive terminal 111 and the output end of the DC positive terminal 121 are connected by a first output structure 16. The output end of the AC negative terminal 112 and the output end of the DC negative terminal 122 are connected by a second output structure 17. The output end of the AC PE terminal 113 and the DC PE terminal 123 are connected by a third output structure 18. The first output structure 16, the second output structure 17, and the third output structure 18 together form the common output terminal.

[0070] The output ends of the AC terminal and the DC terminal are connected by the first output structure 16. The first output structure 16, the second output structure 17, and the third output structure 18 together form the common output terminal, and then are connected to the on-vehicle charger through a cable. The output end of the on-vehicle charger is connected to the power battery, which can reduce the number of cables connected to the output ends of the AC terminal or DC terminal, as well as all accessories such as cable ties, tapes, and brackets used for the cables, greatly reducing the cost.

[0071] Preferably, the first output structure 16, the second output structure 17, and the third output structure 18 are each any one or a combination of a transfer busbar or a transfer wire.

[0072] The first output structure 16, the second output structure 17, and the third output structure 18 all adopt conductive transfer busbars or transfer wires.

[0073] The transfer busbar can be a copper busbar or an aluminum busbar. The copper busbar, also known as the copper bus or copper busbar, is made of copper and is a long conductor with a rectangular or chamfered (rounded) rectangular cross-section (usually a rounded copper busbar to avoid tip discharge). It is a high-current conducting product that plays the role of transmitting current and making electrical connections in a circuit.

[0074] Aluminum busbar: It is a long aluminum product with aluminum and aluminum alloy as raw materials and a rectangular cross-section. Sometimes it is also called a busbar.

[0075] The adapter cable is a conductive cable used to connect the conductive components between the AC terminal and the DC terminal.

[0076] Preferably, the common output terminal is connected to the input terminal of the current identification module through the cable. The DC charging management unit is connected in parallel with the AC charging management unit. The output terminal of the current identification module is respectively connected to the input terminals of the DC charging management unit and the AC charging management unit. The output terminals of the DC charging management unit and the AC charging management unit are connected to the power battery.

[0077] It can be understood that the current identification module identifies the current waveform at the common output terminal. The on-vehicle charger executes the charging mode according to the current waveform. When it is an AC waveform or a DC waveform, it charges the power battery through the AC charging management unit or the DC charging management unit.

[0078] Preferably, between the output terminals of the DC charging management unit and the AC charging management unit and the power battery, a high-voltage distribution unit and a BMS are sequentially connected in series.

[0079] The high-voltage distribution unit is a control unit for distributing the energy of the power battery and is one of the key components of an electric vehicle. It mainly plays the roles of power distribution, short-circuit and overload protection, and supplies power to the power battery and electrical components on the vehicle.

[0080] BMS (Battery Management System) is a system for managing batteries. BMS mainly aims to intelligently manage and maintain each battery unit, prevent the battery from overcharging and over-discharging, extend the service life of the battery, and monitor the state of the battery. BMS is an important link connecting the on-vehicle power battery and the electric vehicle. BMS real-time collects, processes, and stores important information during the operation of the battery pack, exchanges information with external devices such as the vehicle controller, and solves key problems such as safety, availability, usability, and service life in the lithium battery system.

[0081] Preferably, the AC charging management unit integrates a rectifier and converts the alternating current output from the common terminal into direct current through the rectifier.

[0082] The rectifier integrated in the AC charging management unit is an electrical device that can convert the alternating current with a periodically reversed direction into direct current flowing only in one direction.

[0083] Preferably, the DC charging management unit includes a buck circuit and a control module, such as Figure 6As shown, the buck circuit includes a first input capacitor, a first power switch, a first diode, a first inductor, and a first output capacitor. The first input capacitor is connected between the positive and negative poles of the input voltage of the buck circuit, and the first output capacitor is connected between the positive and negative poles of the output voltage of the buck circuit. The first diode is connected in parallel between the first input capacitor and the first output capacitor. The base of the first power switch is connected to the output terminal of the control module. The collector of the first power switch is connected to the positive pole of the input voltage. The emitter of the first power switch is connected to one end of the first inductor. The other end of the first inductor is connected to the positive pole of the output voltage. The anode of the first diode is connected between the negative pole of the input voltage and the negative pole of the output voltage. The cathode of the first diode is connected between the emitter of the power switch and the first inductor.

[0084] The buck circuit is also known as the Buck circuit. The buck principle is as follows: When the power switch is turned on, the input voltage increases instantaneously. Due to the blocking effect of the inductor, at this time, the inductor is connected in series across the power supply, so the inductor must share a part of the voltage. Then the output voltage must be less than the input voltage. When the power switch is turned off, the input voltage is disconnected from the circuit. At this time, the inductor becomes the power supply, and the energy stored in the inductor is released to the load. It should be noted that the voltage of the inductor must be less than the input voltage, as can be seen from the first state.

[0085] Preferably, the DC charging management unit includes a boost circuit and a control module, as Figure 7 As shown, the boost circuit includes a second input capacitor, a second power switch, a second diode, a second inductor, and a second output capacitor. The second input capacitor is connected between the positive and negative poles of the input voltage of the boost circuit, and the second output capacitor is connected between the positive and negative poles of the output voltage of the boost circuit. The second power switch is connected in parallel between the second input capacitor and the second output capacitor. The base of the second power switch is connected to the output terminal of the control module. The collector of the second power switch is connected to one end of the second inductor and the anode of the second diode. The emitter of the second power switch is connected to the negative pole of the input voltage and the negative pole of the output voltage. The other end of the second inductor is connected to the positive pole of the input voltage. The cathode of the second diode is connected to the positive pole of the output voltage.

[0086] The boost circuit, also known as the boost converter, works on the principle of boosting voltage. During the charging process, the power switch is closed. At this time, the input voltage flows through the inductor, and the diode prevents the capacitor from discharging to the ground. Since the input is direct current, the current in the inductor increases linearly at a certain rate. As the inductor current increases, some energy is stored in the inductor. During the discharging process, the power switch is turned off. When the power switch is in the cut-off state, due to the current-holding characteristic of the inductor, the current flowing through the inductor does not immediately become zero but slowly changes from the value at the end of charging to zero. Since the original circuit is disconnected, the inductor can only discharge through the new circuit, that is, the inductor starts to charge the capacitor, and the voltage across the capacitor rises. At this time, the voltage is already higher than the input voltage, and the boosting is completed. The boosting process is an energy transfer process of the inductor. During charging, the inductor absorbs energy, and during discharging, the inductor releases energy. If the capacitance is large enough, a continuous current can be maintained at the output during the discharging process. If this on-off process is repeated continuously, a voltage higher than the input voltage can be obtained across the capacitor.

[0087] Preferably, the control module is configured to control the on / off of the first power switch or the second power switch.

[0088] It can be understood that the control module controls the first power switch to cooperate with the buck circuit to step down the voltage, or the control module controls the on / off of the second power switch to cooperate with the boost circuit to step up the voltage.

[0089] Preferably, the first power switch is any one of an N-channel insulated-gate field-effect transistor, a P-channel field-effect transistor, an NPN-type transistor, a PNP-type transistor, or an insulated-gate bipolar transistor; and / or

[0090] The first diode is a Schottky diode.

[0091] Preferably, the second power switch is any one of an N-channel insulated-gate field-effect transistor, a P-channel field-effect transistor, an NPN-type transistor, a PNP-type transistor, or an insulated-gate bipolar transistor; and / or

[0092] The second diode is a Schottky diode.

[0093] The first power switch and the second power switch can be selected from any one of an N-channel insulated-gate field-effect transistor, a P-channel field-effect transistor, an NPN-type transistor, a PNP-type transistor, or an insulated-gate bipolar transistor according to the requirements of the circuit. The first diode and the second diode can be selected as Schottky diodes because Schottky diodes have the advantages of high switching frequency and low forward voltage drop.

[0094] On the other hand, the present invention provides a control method applied to the AC-DC integrated charging system described in any of the above embodiments. The AC-DC integrated charging system includes an AC-DC charging stand 1, a cable, an on-vehicle charger, and a power battery;

[0095] The AC-DC charging stand 1 includes an AC interface 11 and a DC interface 12. At least one AC terminal for accessing alternating current is provided in the AC interface 11, and at least one DC terminal for accessing direct current is provided in the DC interface 12. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end. The common output end is connected to the on-vehicle charger through the cable, and the output end of the on-vehicle charger is connected to the power battery; The on-vehicle charger is integrated with a current identification module, a DC charging management unit, and an AC charging management unit;

[0096] The control method includes:

[0097] The on-vehicle charger obtains a current waveform by the current identification module and executes different charging modes according to the current waveform;

[0098] If the current waveform obtained by the current identification module is an alternating current waveform, the alternating current is converted into direct current by the AC charging management unit and then supplied to the power battery;

[0099] If the current waveform obtained by the current identification module is a direct current waveform, the power battery is supplied with power by the DC charging management unit.

[0100] Preferably, the charging mode includes a charging current type and a charging communication protocol type.

[0101] That is, it can be understood that the input end of the current identification module is connected to the common output end, and the electrical energy type and the charging communication protocol type of the charging pile docked with the AC-DC charging stand 1 can be identified.

[0102] Preferably, the DC charging management unit includes a buck circuit. The control method includes: the DC charging management unit converts the high-voltage power from the AC-DC charging stand 1 into the preset required electrical energy required by the power battery through the buck circuit, and then supplies the preset required electrical energy to the power battery.

[0103] Preferably, the DC charging management unit includes a boost circuit. The control method includes: the DC charging management unit converts the low-voltage power from the AC-DC charging stand 1 into the preset required electrical energy required by the power battery through the boost circuit, and then supplies the preset required electrical energy to the power battery.

[0104] Preferably, the AC charging management unit is integrated with a rectifier, and the control method includes: the rectifier converts the alternating current output from the common terminal into direct current, and then supplies the direct current to the power battery.

[0105] The rectifier integrated in the AC charging management unit is an electrical device that can convert alternating current, which periodically reverses direction, into direct current that flows only in one direction. This process is called rectification because it straightens the direction of the current. Rectifiers come in various forms, including vacuum tube diodes, wet chemical cells, mercury arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon controlled rectifiers, and other silicon-based semiconductor switches.

[0106] Preferably, the integrated AC-DC charging system communicates with the vehicle CAN, and the control method includes: the on-vehicle charger conducts AC communication and control with the vehicle via the current identification module, and performs AC charging operations or DC charging operations.

[0107] After the current identification module identifies the AC signal of the alternating current or the DC signal of the direct current, it uploads the AC signal or the DC signal to the vehicle's CAN bus. The AC charging management unit converts the alternating current into direct current to perform DC charging operations, or the DC charging management unit directly performs DC charging operations.

[0108] Specifically, it can be understood that if the current identification module identifies the AC signal of the alternating current, the AC charging management unit converts the alternating current into direct current to perform DC charging operations; if the current identification module identifies the DC signal of the direct current, the DC charging management unit performs DC charging operations. The current identification module uploads the AC signal or the DC signal to the vehicle's CAN bus for signal monitoring, AC communication, and control.

[0109] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An AC / DC integrated charging system, comprising an AC / DC charging dock, a cable, an on-vehicle charger, and a power battery, characterized in that the AC / DC charging dock includes an AC interface and a DC interface. At least one AC terminal for accessing alternating current is arranged in the AC interface, and at least one DC terminal for accessing direct current is arranged in the DC interface. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end. The common output end is connected to the on-vehicle charger through the cable, and the output end of the on-vehicle charger is connected to the power battery; the on-vehicle charger is integrated with a current identification module, a DC charging management unit, and an AC charging management unit. The on-vehicle charger is configured to obtain the current waveform of the common output end by the current identification module and execute an AC charging mode or a DC charging mode according to the current waveform. Among them, the AC charging mode or the DC charging mode is to charge the power battery through the AC charging management unit or the DC charging management unit respectively, the AC terminals include an AC negative terminal, an AC PE terminal, and an AC positive terminal. The DC terminals include a DC negative terminal, a DC PE terminal, and a DC positive terminal. The output end of the AC positive terminal is transferred to the output end of the DC positive terminal through a first transfer structure, the output end of the AC negative terminal is transferred to the output end of the DC negative terminal through a second transfer structure, and the output end of the AC PE terminal is transferred to the output end of the DC PE terminal through a third transfer structure. The output ends of the DC positive terminal, the DC negative terminal, and the DC PE terminal together form the common output end, or, the AC terminals include an AC negative terminal, an AC PE terminal, and an AC positive terminal. The DC terminals include a DC negative terminal, a DC PE terminal, and a DC positive terminal. The output end of the AC positive terminal and the output end of the DC positive terminal are connected through a first output structure, the output end of the AC negative terminal and the output end of the DC negative terminal are connected through a second output structure, and the output end of the AC PE terminal and the DC PE terminal are connected through a third output structure. The first output structure, the second output structure, and the third output structure together form the common output end.

2. The integrated AC-DC charging system according to claim 1, wherein The first transfer structure, the second transfer structure, and the third transfer structure are all any one or a combination of transfer rows or transfer wires.

3. The integrated AC-DC charging system according to claim 1, characterized in that The first output structure, the second output structure, and the third output structure are all any one or a combination of transfer rows or transfer wires.

4. The AC / DC integrated charging system according to claim 1, wherein The common output end is connected to the input end of the current identification module through the cable. The DC charging management unit and the AC charging management unit are connected in parallel. The output end of the current identification module is respectively connected to the input ends of the DC charging management unit and the AC charging management unit. The output ends of the DC charging management unit and the AC charging management unit are connected to the power battery.

5. The integrated AC / DC charging system according to claim 4, characterized in that Between the output terminals of the DC charging management unit and the AC charging management unit and the power battery, a high-voltage distribution unit and a BMS are also connected in series in sequence.

6. The AC-DC integrated charging system according to claim 1, characterized in that, The AC charging management unit integrates a rectifier and converts the alternating current output from the common output terminal into direct current through the rectifier.

7. The integrated AC / DC charging system according to claim 1, characterized in that, The DC charging management unit includes a buck circuit and a control module. The buck circuit includes a first input capacitor, a first power switch tube, a first diode, a first inductor, and a first output capacitor. The first input capacitor is connected between the positive and negative poles of the input voltage of the buck circuit, and the first output capacitor is connected between the positive and negative poles of the output voltage of the buck circuit. The first diode is connected in parallel between the first input capacitor and the first output capacitor. The base of the first power switch tube is connected to the output terminal of the control module. The collector of the first power switch tube is connected to the positive pole of the input voltage. The emitter of the first power switch tube is connected to one end of the first inductor. The other end of the first inductor is connected to the positive pole of the output voltage. The anode of the first diode is connected between the negative pole of the input voltage and the negative pole of the output voltage, and the cathode of the first diode is connected between the emitter of the power switch tube and the first inductor.

8. The AC / DC integrated charging system according to claim 1, characterized in that, The DC charging management unit includes a boost circuit and a control module. The boost circuit includes a second input capacitor, a second power switch tube, a second diode, a second inductor, and a second output capacitor. The second input capacitor is connected between the positive and negative poles of the input voltage of the boost circuit, and the second output capacitor is connected between the positive and negative poles of the output voltage of the boost circuit. The second power switch tube is connected in parallel between the second input capacitor and the second output capacitor. The base of the second power switch tube is connected to the output terminal of the control module. The collector of the second power switch tube is connected to one end of the second inductor and the anode of the second diode. The emitter of the second power switch tube is connected to the negative pole of the input voltage and the negative pole of the output voltage. The other end of the second inductor is connected to the positive pole of the input voltage. The cathode of the second diode is connected to the positive pole of the output voltage.

9. The AC / DC integrated charging system according to claim 7 or 8, characterized in that, The control module is configured to control the on and off of the first power switch tube or the second power switch tube.

10. The AC-DC integrated charging system according to claim 7, wherein the first power switch tube is any one of an N-channel insulated gate field effect transistor, a P-channel field effect transistor, an NPN-type transistor, a PNP-type transistor, or an insulated gate bipolar transistor; and / or the first diode is a Schottky diode.

11. The AC-DC integrated charging system according to claim 8, wherein the second power switch tube is any one of an N-channel insulated gate field effect transistor, a P-channel field effect transistor, an NPN-type transistor, a PNP-type transistor, or an insulated gate bipolar transistor; and / or the second diode is a Schottky diode.

12. A control method for an AC-DC integrated charging system according to any one of claims 1-11, wherein the AC-DC integrated charging system comprises an AC-DC charging dock, a cable, an on-vehicle charger and a power battery; The AC-DC charging dock includes an AC interface and a DC interface. At least one AC terminal for accessing alternating current is provided in the AC interface, and at least one DC terminal for accessing direct current is provided in the DC interface. The output ends of the AC terminals and the output ends of the DC terminals are respectively connected to form a common output end, and the common output end is connected to the on-vehicle charger through the cable. The output end of the on-vehicle charger is connected to the power battery; The on-vehicle charger is integrated with a current identification module, a DC charging management unit and an AC charging management unit; Characterized in that, The control method includes: The on-vehicle charger obtains a current waveform by the current identification module and executes different charging modes according to the current waveform; If the current waveform obtained by the current identification module is an alternating current waveform, the alternating current is converted into direct current by the AC charging management unit and then supplied to the power battery; If the current waveform obtained by the current identification module is a direct current waveform, the power battery is supplied with power by the DC charging management unit.

13. The control method according to claim 12, wherein The charging mode includes a charging current type and a charging communication protocol type.

14. The control method according to claim 12, wherein The DC charging management unit includes a buck circuit. The control method includes: the DC charging management unit converts the high-voltage power from the AC-DC charging dock into the preset required electric energy required by the power battery through the buck circuit, and then supplies the preset required electric energy to the power battery.

15. The control method according to claim 12, characterized in that, The DC charging management unit includes a boost circuit. The control method includes: the DC charging management unit converts the low-voltage power from the AC-DC charging dock into the preset required electric energy required by the power battery through the boost circuit, and then supplies the preset required electric energy to the power battery.

16. The control method according to claim 12, wherein The AC charging management unit is integrated with a rectifier. The control method includes: the rectifier converts the alternating current output from the common output end into direct current, and then supplies the direct current to the power battery.

17. The control method according to claim 12, wherein The AC-DC integrated charging system communicates with the vehicle CAN. The control method includes: the on-vehicle charger performs AC communication and control with the vehicle via the current identification module, and executes an AC charging action or a DC charging action, After the current identification module identifies the AC signal of the alternating current or the DC signal of the direct current, the AC signal or the DC signal is uploaded to the vehicle CAN bus, and the AC charging management unit performs AC-to-DC conversion to execute a DC charging action or the DC charging management unit directly performs a DC charging action.

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