Alternating-current / direct-current integrated charging system and control method therefor

Abstract

An alternating-current / direct-current integrated charging system and a control method therefor. The alternating-current / direct-current integrated charging system comprises an alternating-current / direct-current charging base (1), a cable, a vehicle-mounted charger and a power battery. The alternating-current / direct-current charging base (1) comprises an alternating-current interface (11) and a direct-current interface (12), at least one alternating-current terminal is provided in the alternating-current interface (11), and at least one direct-current terminal is provided in the direct-current interface (12). The output end of the alternating-current terminal and the output end of the direct-current terminal are connected to form a common output end, and the common output end is sequentially connected to the vehicle-mounted charger and the power battery by means of the cable. The vehicle-mounted charger is configured to perform an alternating-current charging mode or a direct-current charging mode on the basis of a current waveform recognized by a current recognition module. The alternating-current charging mode or the direct-current charging mode is to charge the power battery by means of an alternating-current charging management unit or a direct-current charging management unit.

Description

AC / DC integrated charging system and control method thereof

[0001] Related applications

[0002] This application claims priority to the Chinese invention patent application with application number 202311083331.1 filed on August 25, 2023, and cites the entire contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present application relates to the technical field of automobile connectors, and in particular to an AC / DC integrated charging system and a control method thereof. Background Art

[0004] With the rapid development of new energy technologies, electric vehicles are becoming increasingly popular. Currently, charging docks on the market offer a wide range of charging interface standards, including national, European, and American standards, as well as DC and AC charging interfaces. Therefore, to accommodate these multiple charging interfaces, electric vehicles typically have integrated AC and DC interfaces. The AC and DC interfaces connect the charger to the vehicle battery, respectively, using cables. Due to the high charging current, the charging harness cable diameter is also relatively thick, and the number of accessories used to assist assembly is also high, significantly increasing the weight and cost of the harness.

[0005] Therefore, a new technical solution is urgently needed to solve the above problems.

[0006] Summary of the Invention

[0007] The purpose of this application is to provide an AC / DC integrated charging system and a control method thereof, so as to solve the problem of large usage of charging harnesses and a large number of accessories on the harnesses, which wastes costs.

[0008] The present application provides an AC / DC integrated charging system, including an AC / DC charging station, cables, an onboard charger, and a power battery.

[0009] The AC / DC charging station includes an AC interface and a DC interface. The AC interface is provided with at least one AC terminal for receiving AC power, and the DC interface is provided with at least one DC terminal for receiving DC power. The output end of the AC terminal and the output end of the DC terminal are respectively connected to form a common output end. The common output end is connected to the on-board charger through the cable, and the output end of the on-board charger is connected to the power battery.

[0010] The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit. The on-board 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.

[0011] Optionally, the AC terminal includes an AC negative terminal, an AC PE terminal and an AC positive terminal, and 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, 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 end of the DC positive terminal, the output end of the DC negative terminal and the output end of the DC PE terminal together form the common output end.

[0012] Optionally, the first adapter structure, the second adapter structure, and the third adapter structure are any one or a combination of adapter bars or adapter lines.

[0013] Optionally, the AC terminal includes an AC negative terminal, an AC PE terminal and an AC positive terminal, and 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, 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.

[0014] Optionally, the first output structure, the second output structure, and the third output structure are any one or a combination of a patch bar or a patch cord.

[0015] Optionally, 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 connected to the input ends of the DC charging management unit and the AC charging management unit respectively, and the output end of the DC charging management unit and the output end of the AC charging management unit are connected to the power battery.

[0016] Optionally, a high-voltage distribution unit and a BMS are connected in series between the output ends of the DC charging management unit and the AC charging management unit and the power battery.

[0017] Optionally, the AC charging management unit is integrated with a rectifier and converts the AC power output from the common end into DC power through the rectifier.

[0018] Optionally, the DC charging management unit includes a step-down circuit and a control module. The step-down 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 step-down circuit, and the first output capacitor is connected between the positive and negative poles of the output voltage of the step-down 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 end 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, and 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.

[0019] Optionally, 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, 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 end 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, and the cathode of the second diode is connected to the positive pole of the output voltage.

[0020] Optionally, the control module is configured to control the on / off of the first power switch tube or the second power switch tube.

[0021] Optionally, 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or

[0022] The first diode is a Schottky diode.

[0023] Optionally, 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or

[0024] The second diode is a Schottky diode.

[0025] Another aspect of the present invention provides a control method for the AC / DC integrated charging system described in any of the above embodiments, wherein the AC / DC integrated charging system includes an AC / DC charging station, a cable, an onboard charger, and a power battery;

[0026] The AC / DC charging station includes an AC interface and a DC interface. The AC interface is provided with at least one AC terminal for receiving AC power, and the DC interface is provided with at least one DC terminal for receiving DC power. The output ends of the AC terminal and the output ends of the DC terminal are respectively connected to form a common output end. The common output end is connected to the on-board charger via the cable. The output end of the on-board charger is connected to the power battery. The on-board charger integrates a current identification module, a DC charging management unit, and an AC charging management unit.

[0027] The control method includes:

[0028] The on-board charger obtains the current waveform from the current identification module and executes different charging modes according to the current waveform;

[0029] If the current waveform acquired by the current identification module is an AC waveform, the AC charging management unit converts the AC into DC and then supplies power to the power battery;

[0030] If the current waveform acquired by the current identification module is a direct current waveform, the power battery is powered by the direct current charging management unit.

[0031] Optionally, the charging mode includes a charging current type and a charging communication protocol type.

[0032] Optionally, the DC charging management unit includes a step-down circuit, and the control method includes: the DC charging management unit converts the high voltage electricity from the AC / DC charging stand into the preset required electrical energy required by the power battery through the step-down circuit, and then supplies the preset required electrical energy to the power battery.

[0033] Optionally, the DC charging management unit includes a boost circuit, and the control method includes: the DC charging management unit converts the low voltage electricity from the AC / DC charging stand into 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.

[0034] Optionally, the AC charging management unit is integrated with a rectifier, and the control method includes: the rectifier converts the AC power output from the common end into DC power, and then supplies the DC power to the power battery.

[0035] Optionally, the AC / DC integrated charging system communicates with the vehicle CAN, and the control method includes: the on-board charger communicates and controls with the vehicle via the current identification module to perform AC charging or DC charging.

[0036] After identifying the AC signal of the AC power or the DC signal of the DC power, the current identification module uploads the AC signal or the DC signal to the vehicle CAN bus, and the AC charging management unit converts AC power to DC power to perform DC charging, or the DC charging management unit directly performs DC charging.

[0037] Beneficial effects of this application:

[0038] The output ends of the AC terminals in the AC interface of the AC / DC charging stand of the present application and the output ends of the DC terminals in the DC interface are respectively connected to form a common output end. The common output end is connected to the on-board charger and the power battery in sequence through cables, thereby eliminating the output cables of the AC terminal output end or the DC terminal output end. The cables are only connected at the common output end, and the AC and DC are connected on the same line. This reduces the amount of charging wiring harness and the number of all wiring harness accessories such as cable ties, tapes, and brackets used for the wiring harness, thereby greatly reducing costs.

[0039] The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit; the on-board 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-board charger has a two-in-one charging management function of the DC charging management unit and the AC charging management unit.

[0040] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0042] FIG1 is a block diagram of the structural principle of an AC / DC integrated charging system according to an embodiment of the present application.

[0043] FIG2 is a connection diagram of an AC / DC integrated charging system according to an embodiment of the present application.

[0044] FIG3 is a schematic structural diagram of an AC interface and a DC interface according to an embodiment of the present application.

[0045] FIG4 is a structural diagram showing that the output end of the AC terminal and the output end of the DC terminal are connected to form a common output end according to an embodiment of the present application.

[0046] FIG5 is a structural diagram showing another embodiment of the present application in which the output end of the AC terminal and the output end of the DC terminal are respectively connected to form a common output end.

[0047] FIG6 is a circuit schematic diagram of a step-down circuit of a DC charging management unit according to an embodiment of the present application.

[0048] FIG7 is a circuit diagram of a boost circuit of a DC charging management unit of the present application.

[0049] The markings in the figure are as follows: 1. AC / DC charging station; 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.

[0050] Explanation of the symbols in the accompanying drawings: Cin1, first input capacitor; Q1, first power switch tube; D1, first diode; L1, first inductor; Cout1, first output capacitor; Cin2, second input capacitor; Q2, second power switch tube; D2, second diode; L2, second inductor; Cout2, second output capacitor. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0052] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0053] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the above-mentioned technologies, methods, and equipment should be considered part of the specification.

[0054] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0055] The AC / DC integrated charging system, as shown in Figures 1 to 5, includes: an AC / DC charging station 1, cables, an on-board charger, and a power battery.

[0056] The AC / DC charging station 1 includes an AC interface 11 and a DC interface 12. The AC interface 11 is equipped with at least one AC terminal for receiving AC power, and the DC interface 12 is equipped with at least one DC terminal for receiving DC power. The output of the AC terminal and the output of the DC terminal are connected to form a common output terminal, which is connected to the onboard charger via a cable. The output of the onboard charger is connected to the power battery.

[0057] The onboard charger integrates a current identification module, a DC charging management unit, and an AC charging management unit. The onboard charger is configured so that the current identification module detects the current waveform at the common output terminal and, based on the current waveform, initiates either AC or DC charging mode. In AC or DC charging mode, the power battery is charged via the AC or DC charging management unit, respectively.

[0058] With the rapid development of new energy technologies, electric vehicles are becoming increasingly popular. Currently, charging ports on the market have a variety of charging interface standards, such as national, European, or American standards. These standards also include DC and AC charging interfaces. Therefore, to accommodate multiple charging interfaces, electric vehicles typically have integrated AC and DC interfaces 11 and 12. The AC and DC interfaces 11 and 12 connect the charger to the vehicle battery, respectively, using cables. Due to the high charging current, the cable diameter of the charging harness is also relatively thick, and the number of accessories used to assist assembly is also high, significantly increasing the weight and cost of the charging harness.

[0059] The output end of the AC terminal in the AC interface 11 of the AC / DC charging stand 1 of the present application and the output end of the DC terminal in the DC interface 12 are respectively connected to form a common output end, which is connected to the on-board charger and the power battery in sequence through cables, thereby eliminating the output cable of the AC terminal output end or the DC terminal output end, and only connecting cables at the common output end. The AC and DC are connected on the same line, which reduces the amount of charging harness and the number of all harness accessories such as cable ties, tapes and brackets used for the charging harness, greatly reducing costs. The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit. The on-board 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-board charger has a two-in-one charging management function of the DC charging management unit and the AC charging management unit.

[0060] Optionally, as shown in FIG4 , the AC terminals include an AC negative terminal 112, an AC PE terminal 113, and an AC positive terminal 111; and the DC terminals include a DC negative terminal 122, a DC PE terminal 123, and a DC positive terminal 121. The output of the AC positive terminal 111 is connected to the output of the DC positive terminal 121 via a first adapter structure 13; the output of the AC negative terminal 112 is connected to the output of the DC negative terminal 122 via a second adapter structure 14; and the output of the AC PE terminal 113 is connected to the output of the DC PE terminal 123 via a third adapter structure 15. The outputs of the DC positive terminal 121, the DC negative terminal 122, and the DC PE terminal 123 collectively form a common output terminal.

[0061] The output end of the AC terminal is transferred to the output end of the DC terminal through a transfer structure. Only the output end of the DC positive terminal 121, the output end of the DC negative terminal 122 and the output end of the DC PE terminal 123 of the DC terminal form a common output end, and are connected to the on-board charger through a cable. The output end of the on-board charger is connected to the power battery, which can reduce the number of AC cables connected to the output end of the AC terminal and all accessories such as cable ties, tapes and brackets used for the cables, thereby greatly reducing costs.

[0062] Optionally, the first adapter structure 13 , the second adapter structure 14 and the third adapter structure 15 are any one or a combination of adapter bars or adapter lines.

[0063] The first adapter structure 13, the second adapter structure 14 and the third adapter structure 15 all use conductive adapter bars or adapter wires. The adapter bars can be copper bars or aluminum bars. The copper bars are also called copper busbars or copper busbars. They are made of copper and are long conductors with rectangular or chamfered (rounded) rectangular cross-sections (rounded copper bars are generally used to avoid tip discharge). They are high-current conductive products that play the role of transmitting current and electrical connection in the circuit.

[0064] Aluminum busbars are long aluminum products with a rectangular cross-section made of aluminum or aluminum alloy, sometimes also called busbars.

[0065] The adapter cable is a conductive cable, which is a conductive component used to connect the AC terminal and the DC terminal (for example, a conductive component connected between the AC terminal and the DC terminal).

[0066] Optionally, as shown in FIG5 , the AC terminals include an AC negative terminal 112, an AC PE terminal 113, and an AC positive terminal 111; and the DC terminals include a DC negative terminal 122, a DC PE terminal 123, and a DC positive terminal 121. The output of the AC positive terminal 111 and the output of the DC positive terminal 121 are connected via a first output structure 16; the output of the AC negative terminal 112 and the output of the DC negative terminal 122 are connected via a second output structure 17; and the output of the AC PE terminal 113 and the DC PE terminal 123 are connected via a third output structure 18. The first output structure 16, the second output structure 17, and the third output structure 18 collectively form a common output terminal.

[0067] The output end of the AC terminal and the output end of the DC terminal are connected through the first output structure 16 (for example, they can also be connected through the first output structure 16, the second output structure 17 and the third output structure 18). The first output structure 16, the second output structure 17 and the third output structure 18 together form a common output end, and then connected to the on-board charger through a cable. The output end of the on-board charger is connected to the power battery, which can reduce the number of cables connected to the output ends of the AC terminal or the DC terminal and all accessories such as cable ties, tapes and brackets used for the cables, thereby greatly reducing costs.

[0068] Optionally, the first output structure 16 , the second output structure 17 and the third output structure 18 are any one or a combination of adapter bars or adapter wires.

[0069] The first output structure 16, the second output structure 17, and the third output structure 18 all use conductive adapter bars or adapter wires. The adapter bars can be copper bars or aluminum bars. Copper bars, also known as copper busbars or copper busbars, are made of copper and are long conductors with rectangular or chamfered (rounded) rectangular cross-sections (rounded copper bars are generally used to avoid tip discharge). They are high-current conductive products that carry current and provide electrical connections in circuits.

[0070] Aluminum busbars are long aluminum products with a rectangular cross-section made of aluminum or aluminum alloy, sometimes also called busbars.

[0071] The adapter cable is a conductive cable, which is a conductive component used to connect the AC terminal and the DC terminal (for example, a conductive component connected between the AC terminal and the DC terminal).

[0072] Optionally, the common output end is connected to the input end of the current identification module through a 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 connected to the input end of the DC charging management unit and the AC charging management unit respectively, and the output end of the DC charging management unit and the output end of the AC charging management unit are connected to the power battery.

[0073] It can be understood as follows: the current identification module identifies the current waveform of the common output end, and the on-board charger executes the charging mode according to the current waveform. When it is an AC waveform or a DC waveform, the power battery is charged through the AC charging management unit or the DC charging management unit.

[0074] Optionally, a high-voltage distribution unit and a BMS (Battery Management System) are connected in series between the output ends of the DC charging management unit and the AC charging management unit and the power battery.

[0075] The high-voltage distribution unit (HDU) is a control unit that distributes energy from the power battery and is a key component in electric vehicles. It primarily distributes power and provides short-circuit and overload protection, supplying power to the power battery and onboard electrical components.

[0076] A BMS is a battery management system. Its primary function is to intelligently manage and maintain individual battery cells, prevent overcharging and over-discharging, extend battery life, and monitor battery status. As the battery management system for electric vehicles, the BMS is the crucial link between the onboard power battery and the electric vehicle. The BMS collects, processes, and stores crucial information about the battery pack's operation in real time, exchanging information with external devices such as the vehicle controller. This information addresses key issues in lithium-ion battery systems, including safety, availability, usability, and service life.

[0077] Optionally, the AC charging management unit is integrated with a rectifier, and the AC power output from the common end is converted into DC power through the rectifier.

[0078] The rectifier integrated into the AC charge management unit is an electrical device that converts alternating current, which periodically reverses direction, into direct current, which flows in only one direction.

[0079] Optionally, the DC charging management unit includes a step-down circuit and a control module, as shown in Figure 6. The step-down 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 step-down circuit, and the first output capacitor is connected between the positive and negative poles of the output voltage of the step-down 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 end 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, and 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.

[0080] The step-down circuit is also called the Buck circuit. The step-down principle is: when the power switch tube is turned on, the input voltage increases instantaneously, and the inductor has an obstructive effect. At this time, the inductor is connected in series to both ends of the power supply, so the inductor must share a part of the voltage, and the output voltage must be lower than the input voltage; when the power switch tube is turned off, the input voltage and the circuit are disconnected, and the inductor becomes the power supply. At this time, the energy stored in the inductor is released to the load, and the voltage of the inductor must be lower than the input voltage, as can be seen from the first state.

[0081] Optionally, the DC charging management unit includes a boost circuit and a control module, as shown in Figure 7. 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 end 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, and the cathode of the second diode is connected to the positive pole of the output voltage.

[0082] A boost circuit, also known as a voltage-boosting circuit, works like this: During the charging process, the power switch is closed. The input voltage flows through the inductor, while the diode prevents the capacitor from discharging to ground. Since the input is DC, 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 discharge process, the power switch is turned off. Due to the current-holding characteristic of the inductor, the current flowing through the inductor does not immediately drop to zero. Instead, it slowly decreases from its value at the time of charging. Since the original circuit is disconnected, the inductor can only discharge through the new circuit. This means that the inductor begins to charge the capacitor, causing the voltage across the capacitor to rise. At this point, the voltage is higher than the input voltage, and the voltage boost is complete. The boost process is an energy transfer process within the inductor. During charging, the inductor absorbs energy, and during discharging, it releases energy. If the capacitance is large enough, a continuous current can be maintained at the output during the discharge process. Repeating this on-off cycle continuously results in a voltage across the capacitor that is higher than the input voltage.

[0083] Optionally, the control module is configured to control the on / off of the first power switch tube or the second power switch tube.

[0084] It can be understood that: the control module controls the first power switch tube to cooperate with the buck circuit to reduce the voltage, or the control module controls the on and off of the second power switch tube to cooperate with the boost circuit to increase the voltage.

[0085] Optionally, 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or

[0086] The first diode is a Schottky diode.

[0087] Optionally, 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or

[0088] The second diode is a Schottky diode.

[0089] The first power switch tube and the second power switch tube can be selected from any one of N-channel insulated gate field effect transistors, P-channel field effect transistors, NPN transistors, PNP transistors or insulated gate bipolar transistors according to circuit usage requirements. The first diode and the second diode can be selected from Schottky diodes because Schottky diodes have the advantages of high switching frequency and low forward voltage drop.

[0090] On the other hand, the present invention provides a control method for an AC / DC integrated charging system applicable to any of the above embodiments. The AC / DC integrated charging system includes an AC / DC charging base 1, a cable, an on-board charger, and a power battery.

[0091] The AC / DC charging station 1 includes an AC interface 11 and a DC interface 12. The AC interface 11 is provided with at least one AC terminal for receiving AC power, and the DC interface 12 is provided with at least one DC terminal for receiving DC power. The output end of the AC terminal and the output end of the DC terminal are respectively connected to form a common output end, which is connected to the on-board charger via a cable. The output end of the on-board charger is connected to the power battery. The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit.

[0092] Control methods include:

[0093] The on-board charger obtains the current waveform through the current identification module and executes different charging modes according to the current waveform; specifically,

[0094] If the current waveform obtained by the current identification module is an AC waveform, the AC charging management unit converts the AC into DC and then supplies power to the power battery;

[0095] If the current waveform obtained by the current identification module is a direct current waveform, power is supplied to the power battery through the direct current charging management unit.

[0096] Optionally, the charging mode includes a charging current type and a charging communication protocol type.

[0097] It can be understood that the input end of the current identification module is connected to the common output end, so as to identify the power type and charging communication protocol type of the charging pile connected to the AC / DC charging station 1.

[0098] Optionally, the DC charging management unit includes a step-down circuit, and the control method includes: the DC charging management unit converts the high voltage electricity from the AC / DC charging station 1 into preset required electrical energy required by the power battery through the step-down circuit, and then supplies the preset required electrical energy to the power battery.

[0099] Optionally, the DC charging management unit includes a boost circuit, and the control method includes: the DC charging management unit converts the low voltage electricity from the AC / DC charging station 1 into 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.

[0100] Optionally, the AC charging management unit is integrated with a rectifier, and the control method includes: the rectifier converts the AC power output from the common end into DC power, and then supplies the DC power to the power battery.

[0101] The rectifier integrated into the AC charge management unit is an electrical device that converts alternating current, which periodically reverses direction, into direct current, which flows in only one direction. This process is called rectification because it straightens the direction of the current. Rectifiers come in many forms, including vacuum tube diodes, wet chemical cells, mercury arc valves, copper and selenium oxide plate assemblies, semiconductor diodes, silicon-controlled rectifiers, and other silicon-based semiconductor switches.

[0102] Optionally, the AC / DC integrated charging system communicates with the vehicle's CAN (Controller Area Network), and the control method includes: the on-board charger communicates and controls the vehicle via the current identification module, performing AC charging or DC charging.

[0103] After identifying the AC signal of AC power or the DC signal of DC power, the current identification module uploads the AC signal or DC signal to the vehicle CAN bus. The AC charging management unit converts AC power to DC power to perform DC charging, or the DC charging management unit directly performs DC charging.

[0104] Specifically, it can be understood that if the current identification module identifies an AC signal of AC power, the AC charging management unit converts AC power to DC power and performs DC charging. If the current identification module identifies a DC signal of DC power, the DC charging management unit performs DC charging. The current identification module uploads the AC signal or DC signal to the vehicle CAN bus for signal monitoring, AC communication and control.

[0105] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An AC / DC integrated charging system, comprising an AC / DC charging station, a cable, an on-board charger and a power battery, characterized in that: The AC / DC charging station includes an AC interface and a DC interface, wherein the AC interface is provided with at least one AC terminal for receiving AC power, and the DC interface is provided with at least one DC terminal for receiving DC power, and the output end of the AC terminal and the output end of the DC terminal are respectively connected to form a common output end, and the common output end is connected to the on-board charger through the cable, and the output end of the on-board charger is connected to the power battery; as well as The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit. The on-board charger is configured to obtain the current waveform of the common output terminal 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.

2. The AC / DC integrated charging system according to claim 1, characterized in that: The AC terminal includes an AC negative terminal, an AC PE terminal and an AC positive terminal, and 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, 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 end of the DC positive terminal, the output end of the DC negative terminal and the output end of the DC PE terminal together form the common output end.

3. The AC / DC integrated charging system according to claim 2, characterized in that: The first adapter structure, the second adapter structure and the third adapter structure are any one or a combination of adapter bars or adapter lines.

4. The AC / DC integrated charging system according to claim 1, characterized in that: The AC terminal includes an AC negative terminal, an AC PE terminal and an AC positive terminal, and 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 end.

5. The AC / DC integrated charging system according to claim 4, characterized in that: The first output structure, the second output structure and the third output structure are any one or a combination of adapter bars or adapter wires.

6. The AC / DC integrated charging system according to claim 1, characterized in that: The common output end is connected to the input end 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 end of the current identification module is connected to the input ends of the DC charging management unit and the AC charging management unit respectively, and the output ends of the DC charging management unit and the AC charging management unit are connected to the power battery.

7. The AC / DC integrated charging system according to claim 6, characterized in that: A high voltage distribution unit and a BMS are connected in series in sequence between the output end of the DC charging management unit, the output end of the AC charging management unit and the power battery.

8. The AC / DC integrated charging system according to claim 1, characterized in that: The AC charging management unit is integrated with a rectifier and converts the AC power output from the common end into DC power through the rectifier.

9. The AC / DC integrated charging system according to claim 1, characterized in that: The DC charging management unit includes a step-down circuit and a control module. The step-down 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 electrodes of the input voltage of the step-down circuit, and the first output capacitor is connected between the positive and negative electrodes of the output voltage of the step-down 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 end of the control module, the collector of the first power switch tube is connected to the positive electrode of the input voltage, the emitter of the first power switch tube is connected to one end of the first inductor, and the other end of the first inductor is connected to the positive electrode of the output voltage. The anode of the first diode is connected between the negative electrode of the input voltage and the negative electrode 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.

10. 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 electrodes of the input voltage of the boost circuit, and the second output capacitor is connected between the positive and negative electrodes 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 end 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 electrode of the input voltage and the negative electrode of the output voltage, the other end of the second inductor is connected to the positive electrode of the input voltage, and the cathode of the second diode is connected to the positive electrode of the output voltage.

11. The AC / DC integrated charging system according to claim 9 or 10, 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.

12. The AC / DC integrated charging system according to claim 9, characterized in that: 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or The first diode is a Schottky diode.

13. The AC / DC integrated charging system according to claim 10, characterized in that: 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 transistor, a PNP transistor or an insulated gate bipolar transistor; and / or The second diode is a Schottky diode.

14. A control method for an AC / DC integrated charging system according to any one of claims 1 to 13, wherein the AC / DC integrated charging system comprises an AC / DC charging station, a cable, an on-board charger and a power battery; The AC / DC charging station includes an AC interface and a DC interface, wherein the AC interface is provided with at least one AC terminal for receiving AC power, and the DC interface is provided with at least one DC terminal for receiving DC power, and the output end of the AC terminal and the output end of the DC terminal are respectively connected to form a common output end, and the common output end is connected to the on-board charger through the cable, and the output end of the on-board charger is connected to the power battery; as well as The on-board charger integrates a current identification module, a DC charging management unit and an AC charging management unit; in, The control method comprises: The on-board charger obtains the current waveform from the current identification module and executes different charging modes according to the current waveform; If the current waveform acquired by the current identification module is an alternating current waveform, the alternating current is converted into direct current by the alternating current charging management unit and then supplied to the power battery; and If the current waveform acquired by the current identification module is a direct current waveform, the power battery is powered by the direct current charging management unit.

15. The control method according to claim 14, characterized in that: The charging mode includes a charging current type and a charging communication protocol type.

16. The control method according to claim 14, characterized in that: The DC charging management unit includes a step-down circuit, and the control method includes: the DC charging management unit converts the high voltage electricity from the AC / DC charging station into preset required electrical energy required by the power battery through the step-down circuit, and then supplies the preset required electrical energy to the power battery.

17. The control method according to claim 14, characterized in that: The DC charging management unit includes a boost circuit, and the control method includes: the DC charging management unit converts the low voltage electricity from the AC / DC charging station into 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.

18. The control method according to claim 14, characterized in that: The AC charging management unit is integrated with a rectifier, and the control method includes: the rectifier converts the AC power output from the common terminal into DC power, and then supplies the DC power to the power battery.

19. The control method according to claim 14, characterized in that: The AC / DC integrated charging system communicates with the vehicle CAN, and the control method includes: the on-board charger communicates and controls with the vehicle via the current identification module to perform AC charging or DC charging. After identifying the AC signal of the AC power or the DC signal of the DC power, the current identification module uploads the AC signal or the DC signal to the vehicle CAN bus, and the AC charging management unit converts AC power to DC power to perform DC charging, or the DC charging management unit directly performs DC charging.

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