Charging circuit and charging device

Abstract

The utility model discloses a charging circuit and charging equipment, and belongs to the technical field of electronics and electrics. The charging circuit is provided with a power grid interface, a charging interface and at least one battery interface, and comprises at least one first charging unit and at least one second charging unit, and an input port of the at least one first charging unit and an input port of the at least one second charging unit are respectively connected with the power grid interface. The output port of the at least one first charging unit is connected with the first port, and the output port of the at least one second charging unit is connected with the second port; the first switch unit is arranged between the first port and the charging interface; the second switch unit is arranged between the second port and a third port, and the third port is connected with each battery interface; and the third switch unit is arranged between the second port and the charging interface. The problem that the vehicle charging device is low in charging efficiency utilization rate can be relieved.

Description

Technical Field

[0001] The present application relates to electronic and electrical technology, and in particular to a charging circuit and a charging device. Background Art

[0002] With the continuous development and application of new energy vehicle related technologies, more and more electric-powered vehicle equipment and their charging devices (such as charging piles, charging stations, etc.) are appearing in people's daily lives. However, most of the current charging devices have the problem of low charging efficiency utilization. For example, if the charging pile works in a light load working mode where the actual output power is less than half of the rated output power, its charging efficiency may be less than 90%, resulting in a large degree of energy waste; moreover, during the peak hours of electricity consumption every day, a large number of vehicles and equipment are charged at the same time, which will bring huge pressure to the power grid, and it is easy to cause each charging pile to be able to allocate a low capacity share of the transformer, resulting in a situation where charging is not only slow but also inefficient. Summary of the invention

[0003] The present application provides a charging circuit and a charging device, which can help alleviate the problem of low charging efficiency utilization rate of vehicle charging devices.

[0004] An embodiment of the present application provides a charging circuit, the charging circuit having a power grid interface, a charging interface and at least one battery interface, and the charging circuit includes:

[0005] at least one first charging unit and at least one second charging unit, wherein an input port of the at least one first charging unit and an input port of the at least one second charging unit are respectively connected to the power grid interface, an output port of the at least one first charging unit is respectively connected to the first port, and an output port of the at least one second charging unit is respectively connected to the second port;

[0006] a first switch unit, the first switch unit being arranged between the first port and the charging interface to control the conduction and disconnection of a current path from the first port to the charging interface;

[0007] a second switch unit, the second switch unit being arranged between the second port and the third port to control the conduction and disconnection of the current path between the second port and the third port, the third port being connected to each of the battery interfaces respectively; and

[0008] A third switch unit is provided between the second port and the charging interface to control the conduction and disconnection of a current path from the second port to the charging interface.

[0009] In some possible implementations, the grid interface includes three AC terminals, each input port of the first charging unit and each input port of the second charging unit includes three input terminals, and the three input terminals are connected one-to-one to the three AC terminals.

[0010] In some possible implementations, the output port of each of the first charging units, the output port of each of the second charging units, the first port, the second port, the third port, the charging interface and each of the battery interfaces each include a positive terminal and a negative terminal; each of the first charging units and each of the second charging units each include a voltage converter capable of converting a three-phase AC power signal from the grid interface into a DC power signal.

[0011] In some possible implementations, the first switch unit includes a first switch and a second switch, the first switch is arranged between the positive terminal of the first port and the positive terminal of the charging interface, and the second switch is arranged between the negative terminal of the first port and the negative terminal of the charging interface; the second switch unit includes a third switch and a fourth switch, the third switch is arranged between the positive terminal of the second port and the positive terminal of the battery interface, and the fourth switch is arranged between the negative terminal of the second port and the negative terminal of the battery interface; the third switch unit includes a fifth switch and a sixth switch, the fifth switch is arranged between the positive terminal of the second port and the positive terminal of the charging interface, and the sixth switch is arranged between the negative terminal of the second port and the negative terminal of the charging interface.

[0012] In some possible implementations, the charging circuit also includes at least one of a first fuse and a second fuse, the first fuse is arranged between the first switch and the positive terminal of the charging interface, and the second fuse is arranged between the positive terminal of the second port and the third switch.

[0013] In some possible implementations, the charging circuit also includes: a first current detector, which is arranged between the positive terminal of the first port and the first switch to detect the current value of the current passing through the first port; a second current detector, which is arranged between the positive terminal of the second port and the fifth switch to detect the current value of the current passing through the second port; and an energy meter, which is arranged between the sixth switch and the negative terminal of the charging interface to detect the value of the electric energy passing through the charging interface during each working period of the energy meter.

[0014] In some possible implementations, the charging circuit also includes: at least one first anti-reverse unit corresponding one-to-one to the at least one first charging unit, each of the first anti-reverse units being arranged between the output port of the corresponding first charging unit and the first port to prevent current from flowing from the first port to the corresponding first charging unit; and at least one second anti-reverse unit corresponding one-to-one to the at least one second charging unit, each of the second anti-reverse units being arranged between the output port of the corresponding second charging unit and the second port to prevent current from flowing from the second port to the corresponding second charging unit.

[0015] An embodiment of the present application also provides a charging device, which is any one of the charging circuits described above.

[0016] In some possible implementations, the charging device further includes at least one battery module, and a power interface of the at least one battery module is connected one-to-one with at least one battery interface of the charging circuit.

[0017] In some possible implementations, the charging device further includes a charging gun, and a power interface of the charging gun is connected to a charging interface of the charging circuit.

[0018] It can be seen that in the charging circuit of the embodiment of the present application, different working states of the charging circuit can be switched by changing the switch states of the first, second and third switch units - when the first and second switch units are turned on and the third switch unit is turned off, the charging circuit can supply power to the charging interface while charging the external battery through the battery interface, so that the actual output power can be closer to the rated output power, and the power utilization efficiency of the charging circuit is improved to adapt to light load application scenarios; when the first and third switch units are turned on and the second switch unit is turned off, the charging circuit can supply power to the charging interface with all the power received by the grid interface to adapt to heavy load application scenarios; when the first, second and third switch units are all turned on, the external battery can supply power to the charging interface together with the auxiliary charging circuit through the battery interface to adapt to application scenarios where the power supply of the grid interface is insufficient; when the first switch unit is turned off and the second and third switch units are turned on, the external battery can supply power to the charging interface alone through the battery interface to adapt to application scenarios where the grid interface is powered off. In this way, the charging circuit can switch between different working states to flexibly adapt to different application scenarios. Therefore, the embodiments of the present application can help alleviate the problem of low charging efficiency utilization of the vehicle charging device, as well as the problem of slow and inefficient charging when the power grid pressure is too large. It helps to shorten the vehicle charging time, improve the power utilization efficiency of the vehicle charging device, save energy, and help reduce the peak-to-valley difference of the power grid load, helping the power grid to achieve a balance between power generation and power consumption.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a structural block diagram of a charging circuit in an embodiment of the present application;

[0022] Figure 2 It is a schematic block diagram of the structure of a charging device in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Figure 1 It is a structural block diagram of a charging circuit in an embodiment of the present application. Figure 1 , the charging circuit has a power grid interface S1, a charging interface S2 and at least one battery interface S3. In an application scenario example, the power grid interface S1 of the charging circuit is connected to the mains power grid, the charging interface S2 is connected to the device to be charged through a component such as a charging gun, and each battery interface S3 is connected to a battery module, so that the charging circuit can use the power provided by the power grid and / or the battery module to charge the device to be charged.

[0026] See also Figure 1The charging circuit includes at least one first charging unit 11, at least one second charging unit 12, a first switch unit 13, a second switch unit 14 and a third switch unit 15, wherein: the input port of at least one first charging unit 11 and the input port of at least one second charging unit 12 are respectively connected to the power grid interface S1, the output port of at least one first charging unit 11 is respectively connected to the first port P1, and the output port of at least one second charging unit 12 is respectively connected to the second port P2; the first switch unit 13 is arranged between the first port P1 and the charging interface S2 to control the conduction and disconnection of the current path from the first port P1 to the charging interface S2; the second switch unit 14 is arranged between the second port P2 and the third port P3 to control the conduction and disconnection of the current path between the second port P2 and the third port P3, and the third port P3 is respectively connected to each battery interface S3; the third switch unit 15 is arranged between the second port P2 and the charging interface S2 to control the conduction and disconnection of the current path from the second port P2 to the charging interface S2. It should be noted that each of the above-mentioned ports and interfaces may have one terminal or multiple different terminals, and the number of terminals of a port connected to a port / interface should be the same as the number of terminals of the connected port / interface; in addition, any terminal may correspond to a physical connection structure (such as a contact, a connection point), or may only correspond to a circuit node on the circuit diagram.

[0027] It can be seen that in the charging circuit of the embodiment of the present application, different working states of the charging circuit can be switched by changing the switching states of the first switch unit 13, the second switch unit 14 and the third switch unit 15 - when the first switch unit 13 and the second switch unit 14 are turned on and the third switch unit 15 is turned off, the charging circuit can supply power to the charging interface S2 while charging the external battery through the battery interface S3, so that the actual output power can be closer to the rated output power, and the power utilization efficiency of the charging circuit is improved to adapt to the application scenario of light load; when the first switch unit 13 and the third switch unit 15 are turned on and the second switch unit 14 .... When the first switch unit 13, the second switch unit 14 and the third switch unit 15 are all turned on, the external battery can supply power to the charging interface S2 through the battery interface S3 to assist the charging circuit, so as to adapt to the application scenario where the power supply of the power grid interface S1 is insufficient; when the first switch unit 13 is disconnected and the second switch unit 14 and the third switch unit 15 are turned on, the external battery can supply power to the charging interface S2 through the battery interface S3 alone, so as to adapt to the application scenario where the power grid interface S1 is powered off. In this way, the charging circuit can switch between different working states to flexibly adapt to different application scenarios. Therefore, the embodiment of the present application can help alleviate the problem of low charging efficiency utilization of the vehicle charging device, as well as the problem of slow and inefficient charging when the power grid pressure is too large, which helps to shorten the vehicle charging time, improve the power utilization efficiency of the vehicle charging device, save energy, and help reduce the peak-to-valley difference of the power grid load, and help the power grid to achieve a balance between power generation and power consumption.

[0028] It should be noted that any of the above-mentioned charging units can be implemented, for example, by using a circuit structure with a voltage conversion function (such as an AC-DC converter, a DC-DC converter, etc.), and any of the above-mentioned switch units can be implemented, for example, by using a circuit structure with a switch function (such as a relay, a transistor, a mechanical switch, etc.); in addition, it can be noted that the above-mentioned first switch unit 13 and the third switch unit 15 control the conduction and disconnection of the unidirectional current path, while the above-mentioned second switch unit 14 controls the conduction and disconnection of the bidirectional current path. One possible implementation method is that each switch unit includes a bidirectional switch element, and a circuit structure with a unidirectional conduction function (such as a diode or its equivalent circuit, not shown in the drawings) connected in series with the bidirectional switch element is added to the first switch unit 13 and the third switch unit 15. Another implementation method is that each switch unit includes a bidirectional switch element, and a first anti-reverse unit (such as a diode or its equivalent circuit, not shown in the drawings) is set between the output port of each first charging unit 11 and the first port P1, and a second anti-reverse unit (such as a diode or its equivalent circuit, not shown in the drawings) is set between the output port of each second charging unit 12 and the second port P2. For example, the charging circuit may include: at least one first anti-reverse unit corresponding to at least one first charging unit 11, each first anti-reverse unit is arranged between the output port of the corresponding first charging unit 11 and the first port P1 to prevent the current from flowing from the first port P1 to the corresponding first charging unit 11; and at least one second anti-reverse unit corresponding to at least one second charging unit 12, each second anti-reverse unit is arranged between the output port of the corresponding second charging unit 12 and the second port P2 to prevent the current from flowing from the second port P2 to the corresponding second charging unit 12. It can be seen that the former implementation can help reduce the number of unidirectional conduction circuit structures required, while the latter implementation is more conducive to protecting each charging unit from the impact of reverse current. In addition, in some implementations, the first anti-reverse unit is set as a component of the first charging unit, and / or the second anti-reverse unit is set as a component of the second charging unit, which is not limited in this application.

[0029] Figure 2 : is a schematic block diagram of the structure of a charging device in an embodiment of the present application. The charging device in an embodiment of the present application may be, for example, any vehicle charging device, and its form may be, for example, a charging pile, a charging box, a charging station, a charging system, a charging circuit assembly, etc., and the embodiment of the present application does not limit this. Figure 2 ,exist Figure 2In the example shown, the charging device further includes a charging gun 20 and at least one battery module 30 on the basis of the above-mentioned charging circuit, wherein the power interface of at least one battery module 30 is connected one-to-one with at least one battery interface S3 of the charging circuit, and the power interface of the charging gun is connected with the charging interface S2 of the charging circuit. In addition, in the above-mentioned charging circuit, the grid interface S1 includes three AC terminals, and the input port of each first charging unit 11 and the input port of each second charging unit 12 include three input terminals connected one-to-one with the three AC terminals; and the output port of each first charging unit 11, the output port of each second charging unit 12, the first port P1, the second port P2, the third port, the charging interface S2 and each battery interface S3 each include a positive terminal and a negative terminal.

[0030] In this way, each of the at least one first charging unit 11 and the at least one second charging unit 12 has three input terminals and two positive and negative output terminals, and thus each may include a voltage converter capable of converting a three-phase AC signal from the grid interface S1 into a DC signal, so that each charging unit can independently output a charging signal that complies with the charging standards of the charging interface S2 and the battery interface S3. Each charging unit may have the same or different circuit structures, and its implementation method may refer to the circuit structure of a voltage converter having the function of converting a three-phase AC signal into a DC signal in the related art.

[0031] As an example, see Figure 2 , the first switch unit 13 includes a first switch K1 and a second switch K2, the first switch K1 is arranged between the positive terminal of the first port P1 and the positive terminal of the charging interface S2, and the second switch K2 is arranged between the negative terminal of the first port P1 and the negative terminal of the charging interface S2; the second switch unit 14 includes a third switch K3 and a fourth switch K4, the third switch K3 is arranged between the positive terminal of the second port P2 and the positive terminal of the battery interface S3, and the fourth switch K4 is arranged between the negative terminal of the second port P2 and the negative terminal of the battery interface S3; the third switch unit 15 includes a fifth switch K5 and a sixth switch K6, the fifth switch K5 is arranged between the positive terminal of the second port P2 and the positive terminal of the charging interface S2, and the sixth switch K6 is arranged between the negative terminal of the second port P2 and the negative terminal of the charging interface S2. Thus, when the two switches of each switch unit are closed, the current path between the two ends of the switch unit is conducted; and when the two switches of each switch unit are opened, the current path between the two ends of the switch unit is disconnected.

[0032] As an example, see Figure 2The charging circuit may further include at least one of a first fuse FU1 and a second fuse FU2, wherein the first fuse FU1 is arranged between the first switch K1 and the positive terminal of the charging interface S2, and the second fuse FU2 is arranged between the positive terminal of the second port P2 and the third switch K3. In this way, when the current passing through the charging interface S2 is too high, the first fuse FU1 can play an overcurrent protection role, and when the current passing through the third port P3 is too high, the second fuse FU2 can play an overcurrent protection role.

[0033] As an example, see Figure 2 The charging circuit may further include a first current detector H1 and a second current detector H2, wherein the first current detector H1 is disposed between the positive terminal of the first port P1 and the first switch K1, and the second current detector H2 is disposed between the positive terminal of the second port P2 and the fifth switch K5, so as to detect the current values ​​of the current passing through the first port P1 and the second port P2, respectively, so as to provide a reference for the switch control of each switch unit. In addition, see Figure 2 The charging circuit may also include an energy meter ( Figure 2 In the example, the circuit structure consisting of the shunt RS1 and the electric energy meter PJ connected in parallel is used as an example), and the electric energy meter is arranged between the sixth switch K6 and the negative terminal of the charging interface S2 to detect the value of the electric energy passing through the charging interface S2 in each working period of the electric energy meter. In one example, the electric energy meter may accumulate the amount of electric energy (for example, in joules or milliampere hours) passing through the electric energy meter PJ each time it is reset, so that by reading the reading on the electric energy meter PJ, the value of the electric energy actually output by the charging circuit through the charging interface S2 since the last reset can be understood, thereby providing a reference for the actual working conditions of the charging circuit and the charging device.

[0034] In some examples, when the charging device includes a large number of battery modules 30, each battery module 30 can be configured in one or more energy storage cabinets according to application requirements to meet application requirements of application scenarios such as large charging stations.

[0035] It should be noted that the above are only optional embodiments of the present application, and each of the above implementation methods can be appropriately modified according to actual application requirements, such as increasing or decreasing the number of similar components or circuit structures, or adding other circuit structures with corresponding auxiliary functions, etc. The present application does not impose any restrictions on this.

[0036] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A charging circuit, characterized in that: The charging circuit has a power grid interface, a charging interface and at least one battery interface, and the charging circuit includes: at least one first charging unit and at least one second charging unit, wherein an input port of the at least one first charging unit and an input port of the at least one second charging unit are respectively connected to the power grid interface, an output port of the at least one first charging unit is respectively connected to the first port, and an output port of the at least one second charging unit is respectively connected to the second port; a first switch unit, the first switch unit being arranged between the first port and the charging interface to control the conduction and disconnection of a current path from the first port to the charging interface; a second switch unit, the second switch unit being arranged between the second port and the third port to control the conduction and disconnection of the current path between the second port and the third port, the third port being connected to each of the battery interfaces respectively; and A third switch unit is provided between the second port and the charging interface to control the conduction and disconnection of a current path from the second port to the charging interface.

2. The charging circuit according to claim 1, characterized in that: The grid interface includes three AC terminals, each input port of the first charging unit and each input port of the second charging unit includes three input terminals, and the three input terminals are connected to the three AC terminals in a one-to-one manner.

3. The charging circuit according to claim 2, characterized in that: The output port of each of the first charging units, the output port of each of the second charging units, the first port, the second port, the third port, the charging interface and each of the battery interfaces each include a positive terminal and a negative terminal; each of the first charging units and each of the second charging units each include a voltage converter capable of converting a three-phase AC power signal from the grid interface into a DC power signal.

4. The charging circuit according to claim 3, characterized in that: The first switch unit includes a first switch and a second switch, the first switch is arranged between the positive terminal of the first port and the positive terminal of the charging interface, and the second switch is arranged between the negative terminal of the first port and the negative terminal of the charging interface; The second switch unit includes a third switch and a fourth switch, the third switch is arranged between the positive terminal of the second port and the positive terminal of the battery interface, and the fourth switch is arranged between the negative terminal of the second port and the negative terminal of the battery interface; The third switch unit includes a fifth switch and a sixth switch, the fifth switch is arranged between the positive terminal of the second port and the positive terminal of the charging interface, and the sixth switch is arranged between the negative terminal of the second port and the negative terminal of the charging interface.

5. The charging circuit according to claim 4, characterized in that: The charging circuit also includes at least one of a first fuse and a second fuse, the first fuse is arranged between the first switch and the positive terminal of the charging interface, and the second fuse is arranged between the positive terminal of the second port and the third switch.

6. The charging circuit according to claim 4, characterized in that: The charging circuit further comprises: a first current detector, the first current detector being disposed between the positive terminal of the first port and the first switch to detect a current value of a current passing through the first port; a second current detector, the second current detector being disposed between the positive terminal of the second port and the fifth switch to detect a current value of the current of the second port; An electric energy meter is arranged between the sixth switch and the negative terminal of the charging interface to detect the value of the electric energy passing through the charging interface in each working period of the electric energy meter.

7. The charging circuit according to any one of claims 1 to 6, characterized in that: The charging circuit further comprises: at least one first anti-reverse unit corresponding one-to-one to the at least one first charging unit, each of the first anti-reverse units being arranged between an output port of a corresponding first charging unit and the first port to prevent current from flowing from the first port to the corresponding first charging unit; and At least one second anti-reverse unit corresponds one-to-one to the at least one second charging unit, and each second anti-reverse unit is arranged between the output port of the corresponding second charging unit and the second port to prevent current from flowing from the second port to the corresponding second charging unit.

8. A charging device, characterized in that: The charging device comprises the charging circuit according to any one of claims 1 to 7.

9. The charging device according to claim 8, characterized in that: The charging device further comprises at least one battery module, and a power interface of the at least one battery module is connected one-to-one with at least one battery interface of the charging circuit.

10. The charging device according to claim 8 or 9, characterized in that: The charging device also includes a charging gun, and a power interface of the charging gun is connected to the charging interface of the charging circuit.

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