Charging circuit and charging device

Abstract

The utility model provides a charging circuit and a charging device, and the charging circuit comprises a DC main input loop which comprises a DC circuit breaker, and the input end of the DC circuit breaker is connected to the input port of the charging circuit; the DC output loop comprises a DC / DC rectification unit and a high-voltage DC contactor group, the input end of the DC / DC rectification unit is coupled with the output end of the DC circuit breaker, and the output end of the DC / DC rectification unit is coupled with the input end of the high-voltage DC contactor group; and the output end of the high-voltage direct-current contactor group is connected to the output port of the charging circuit. According to the utility model, the charging requirement in a specific scene can be met, and as an off-grid mobile energy complementing scheme, the charging device is more flexible and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy charging, in particular to a charging circuit and a charging device. Background Art

[0002] With the increasing use of pure electric vehicles, the demand for charging them is also increasing dramatically. The electric vehicle charging market is placing increasingly high demands on the convenience and timeliness of charging. Convenient, safe, and fast charging methods are the unanimous market demand for vehicle charging.

[0003] Existing fixed DC charging piles require an initial estimate of charging demand at the time of construction, and the selection of the appropriate power capacity based on the predicted charging demand is then reported. Construction is then completed, and charging services are provided to vehicles within the coverage area in the form of charging stations. The advantage of this type of fixed charging station lies in its scale and volume, which can serve a sufficient number of vehicles at the same time for rapid energy replenishment. However, in some specific scenarios such as communities, ports, and mining areas, there are often limited sites or power capacity, making the scale of the charging station unable to meet the charging needs of new vehicles at the current stage or in the next stage. At the same time, during holidays, due to excessive traffic, fixed DC charging piles are also unable to meet the charging needs of holiday vehicles, resulting in obstructed vehicle traffic and, to a certain extent, affecting the promotion of electric vehicles.

[0004] Therefore, it is necessary to provide a charging circuit and a charging device to solve the above problems existing in the prior art. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a charging circuit and a charging device to solve the problem that the prior art cannot flexibly meet the charging needs in specific scenarios.

[0006] To achieve the above-mentioned and other related objectives, the first aspect of the present invention provides a charging circuit, comprising:

[0007] a DC main input circuit, comprising a DC circuit breaker, wherein an input end of the DC circuit breaker is connected to an input port of the charging circuit;

[0008] A DC output circuit includes a DC / DC rectifier unit and a high-voltage DC contactor group. The input end of the DC / DC rectifier unit is coupled to the output end of the DC circuit breaker, and the output end of the DC / DC rectifier unit is coupled to the input end of the high-voltage DC contactor group. The output end of the high-voltage DC contactor group is connected to the output port of the charging circuit.

[0009] In some embodiments of the present application, the DC main input circuit further includes a first fuse, a first shunt, and a DC meter connected in parallel to the first shunt, and the first fuse and the first shunt are electrically connected to the two output lines of the DC circuit breaker respectively.

[0010] In some embodiments of the present application, the high-voltage DC contactor group includes a first high-voltage DC contactor group, the DC / DC rectifier unit includes a first DC / DC rectifier module group and a second DC / DC rectifier module group, the first high-voltage DC contactor group is connected between the output end of the first DC / DC rectifier module group and the output end of the second DC / DC rectifier module group, the output end of the first DC / DC rectifier module group and one end of the first high-voltage DC contactor group are coupled to the first output port of the charging circuit by a lead, and the output end of the second DC / DC rectifier module group and the other end of the first high-voltage DC contactor group are coupled to the second output port of the charging circuit by a lead.

[0011] In some embodiments of the present application, the DC output circuit further includes: a second fuse, a second shunt, a third fuse, a third shunt and a dual-circuit DC meter; a first circuit and a second circuit are led out between the output end of the first DC / DC rectifier module group and one end of the first high-voltage DC contactor group; a third circuit and a fourth circuit are led out between the output end of the second DC / DC rectifier module group and the other end of the first high-voltage DC contactor group; the first circuit and the second circuit are respectively connected to the input end of the second fuse and the input end of the second shunt, the third circuit and the fourth circuit are respectively connected to the input end of the third fuse and the input end of the third shunt, and the dual-circuit DC meter is connected in parallel with the second shunt and the third shunt, respectively.

[0012] In some embodiments of the present application, the high-voltage DC contactor group also includes a second high-voltage DC contactor group and a third high-voltage DC contactor group, the output end of the second fuse and the output end of the second shunt are both connected to one end of the second high-voltage DC contactor group, and the output end of the third fuse and the output end of the third shunt are both connected to one end of the third high-voltage DC contactor group.

[0013] In some embodiments of the present application, a first auxiliary circuit is also led out from the input end of the DC / DC rectifier unit, and the first auxiliary circuit includes a 12V DC-DC switching power supply, a 24V DC-DC switching power supply, and a 12V battery and a 24V battery connected to the input end of the DC / DC rectifier unit, and the 12V DC-DC switching power supply and the 24V DC-DC switching power supply are electrically connected to the corresponding power consumption system; the 12V battery and the 24V battery are respectively electrically connected to the power consumption system through an isolation diode; the 12V DC-DC switching power supply is connected to the 12V battery, and the 24V DC-DC switching power supply is connected to the 24V battery.

[0014] In some embodiments of the present application, a second auxiliary circuit is also led out from the input end of the DC / DC rectifier unit, and the second auxiliary circuit includes a 12V AC-DC switching power supply and a 24V AC-DC switching power supply; the input ends of the 12V AC-DC switching power supply and the 24V AC-DC switching power supply are connected to the mains, and the output ends are electrically connected to the corresponding power consumption system.

[0015] In some embodiments of the present application, both the input port and the output port of the charging circuit are configured with an insulation detection module.

[0016] A second aspect of the present invention provides a charging device, comprising:

[0017] electrical energy storage devices;

[0018] As described above, the charging circuit has an input port electrically connected to the electric energy storage device for inputting electric energy from the electric energy storage device; and an output port electrically connected to the device to be charged for outputting electric energy to the device to be charged.

[0019] In some embodiments of the present application, the input port is electrically connected to the electric energy storage device through a first charging gun, and the output port is electrically connected to the device to be charged through a second charging gun.

[0020] As described above, the charging circuit and charging device of the present invention have the following beneficial effects:

[0021] The input port of the charging circuit is connected to the energy storage device. After drawing power from the energy storage device through the charging circuit, it passes through the DC circuit breaker of the DC main input circuit, the DC / DC rectifier unit of the DC output circuit, and the high-voltage DC contactor group in sequence. The output end of the high-voltage DC contactor group is connected to the output port of the charging circuit, and the output port of the charging circuit is connected to the device to be charged, thus forming a complete charging circuit. In specific scenarios where there are no fixed charging piles or the number of charging piles cannot meet the charging needs, flexible charging of the device to be charged is achieved. As an off-grid mobile energy replenishment solution, it fills the gaps in vehicle emergency charging needs and off-grid charging energy replenishment needs in certain specific scenarios in the current market, and meets the vehicle charging energy replenishment needs in specific scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1-Figure 2 Shown is a schematic diagram of a charging circuit in one embodiment of the present invention.

[0023] Figure 3 Shown is a schematic diagram of a first auxiliary circuit in a charging circuit in one embodiment of the present invention.

[0024] Figure 4 Shown is a schematic diagram of a second auxiliary circuit in a charging circuit in one embodiment of the present invention.

[0025] Figure 5 Shown is a schematic diagram of an auxiliary control circuit in one embodiment of the present utility model.

[0026] Figure 6 Shown is a schematic diagram of a charging device in one embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0028] In the embodiments of this application, terms such as "first" and "second" are used to distinguish between identical or similar items with substantially the same function or effect. For example, the first XX and the second XX are merely used to distinguish between different XXs and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or order of execution, and that terms such as "first" and "second" do not necessarily define differences.

[0029] It should be noted that in the embodiments of this application, words such as "exemplary" or "for example" represent examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0030] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b, c can be single or multiple.

[0031] Before further explaining the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are subject to the following interpretations:

[0032] <1> High-voltage DC contactor: A switching element used to control the connection or disconnection between the high-voltage DC power supply and the load in a high-voltage DC transmission system. Its main function is to control and protect the current in the high-voltage DC system to ensure the normal operation of the power system.

[0033] <2> An Insulation Monitoring Device (IMD) is a device specifically designed to monitor the insulation status of power systems (especially DC systems) to ground. It monitors the system's insulation resistance in real time and issues an alarm if the insulation resistance falls below a set safety threshold.

[0034] <3> A Battery Management System (BMS) is an electronic system designed to monitor and manage battery energy storage units. It is primarily used in electric vehicles, energy storage systems, drones, portable electronic devices, and other applications. The primary purpose of a BMS is to ensure safe, efficient, and balanced operation of the battery pack, extend battery life, and provide accurate battery status information.

[0035] <4> On-Board Charger (OBC): As an important component in new energy vehicles, its main function is to convert external alternating current (AC) into direct current (DC) to charge the power battery pack of the electric vehicle.

[0036] In certain scenarios, charging stations face the problem of mismatching charging capacity and charging demand during peak charging periods, or a surge in charging vehicles in the target area, making it difficult to report related power capacity approvals. In order to solve this technical problem, the present invention provides a charging circuit and charging device that are different from the traditional fixed DC charging piles currently on the market. They are used to fill the gaps in the current market's emergency charging needs and off-grid charging and energy replenishment needs for vehicles in certain specific scenarios. They can also meet vehicle charging and energy replenishment needs without site planning or power capacity expansion. As an off-grid mobile energy replenishment solution, the present invention is more flexible in use than existing technologies and solves the problem of charging difficulties in special scenarios.

[0037] In order to facilitate the understanding of the embodiments of the present invention, the following will be combined with Figures 1-6 Detailed description.

[0038] like Figures 1-6 As shown, an embodiment of the present invention provides a charging circuit 100, comprising: a DC main input circuit 10 and a DC output circuit 20. The DC main input circuit 10 includes a DC circuit breaker 11. The input end of the DC circuit breaker 11 is connected to the input port of the charging circuit 100. The DC output circuit 20 includes a DC / DC rectifier unit 21 and a high-voltage DC contactor group. The input end of the DC / DC rectifier unit 21 is coupled to the output end of the DC circuit breaker 11. The output end of the DC / DC rectifier unit 21 is coupled to the input end of the high-voltage DC contactor group. The output end of the high-voltage DC contactor group is connected to the output port of the charging circuit 100.

[0039] After taking power, it flows through the DC circuit breaker 11 of the DC main input circuit 10, the DC / DC rectifier unit 21 of the DC output circuit 20, and the high-voltage DC contactor group in sequence through the input port of the charging circuit 100. The output end of the high-voltage DC contactor group is connected to the output port of the charging circuit 100, and outputs electric energy to the outside to form a complete charging circuit, that is, DC power is output to the outside through the charging circuit 100 to charge and replenish the vehicle. Compared with the fixed charging pile in the prior art, it is an off-grid mobile energy replenishment solution that can meet the charging needs in specific scenarios and greatly improves the charging convenience in specific scenarios.

[0040] It should be understood that by designing a DC circuit breaker 11 within the DC main input circuit 10, overload protection and short-circuit protection are implemented for the charging circuit 100. Specifically, a molded case circuit breaker is used as the DC circuit breaker 11. Molded case circuit breakers can quickly respond to overload and short-circuit conditions in the circuit, quickly cutting off power and preventing equipment damage. Furthermore, due to the characteristics of their manufacturing materials and processes, they can operate stably for long periods of time in high-voltage DC environments, reducing equipment failure rates.

[0041] like Figure 1 As shown, in some embodiments of the present invention, the DC main input circuit 10 further includes a first fuse 12, a first shunt 13, and a DC meter 14 connected in parallel to the first shunt 13. The first fuse 12 and the first shunt 13 are electrically connected to the two output lines of the DC circuit breaker 11, respectively.

[0042] like Figure 1 As shown and combined with reference Figure 6 In some embodiments of the present invention, the high-voltage DC contactor group includes a first high-voltage DC contactor group 22. The DC / DC rectifier unit 21 includes a first DC / DC rectifier module group 211 and a second DC / DC rectifier module group 212. The first high-voltage DC contactor group 22 is connected between the output end of the first DC / DC rectifier module group 211 and the output end of the second DC / DC rectifier module group 212. A lead wire is coupled between the output end of the first DC / DC rectifier module group 211 and one end of the first high-voltage DC contactor group 22 to the first output port of the charging circuit 100. A lead wire is coupled between the output end of the second DC / DC rectifier module group 212 and the other end of the first high-voltage DC contactor group 22 to the second output port of the charging circuit 100.

[0043] When the first high-voltage DC contactor group 22 is in the open state, the first DC / DC rectifier module group 211 and the second DC / DC rectifier module group 212 work independently and output DC power to the first output port and the second output port respectively; when the first high-voltage DC contactor group 22 is in the closed state, the first DC / DC rectifier module group 211 and the second DC / DC rectifier module group 212 work together and output DC power to the first output port or the second output port at the same time.

[0044] like Figure 1 and Figure 2 As shown, in a specific embodiment, the first high-voltage DC contactor group 22 includes a first high-voltage DC contactor 221 and a second high-voltage DC contactor 222. The first high-voltage DC contactor 221 and the second high-voltage DC contactor 222 are both connected between the output end of the first DC / DC rectifier module group 211 and the output end of the second DC / DC rectifier module group 212.

[0045] Exemplarily, the first DC / DC rectifier module group 211 includes two DC / DC rectifier modules 2111, and the second DC / DC rectifier module group 212 also includes two DC / DC rectifier modules 2121. That is, the DC output circuit 20 includes four DC / DC rectifier modules. It should be noted that the number of DC / DC rectifier modules included in the first DC / DC rectifier module group 211 and the second DC / DC rectifier module group 212 should be specifically designed based on actual usage and is not specifically limited. The power of each DC / DC rectifier module is 30 kW or 40 kW.

[0046] like Figure 1 As shown, in some embodiments of the present invention, the DC output circuit 20 further includes: a second fuse 23, a second shunt 24, a third fuse 25, a third shunt 26, and a dual-circuit DC meter 27. The dual-circuit DC meter 27 is connected in parallel with the second shunt 24 and the third shunt 26, respectively.

[0047] A first circuit and a second circuit extend between the output end of the first DC / DC rectifier module group 211 and one end of the first high-voltage DC contactor group 22. The first circuit and the second circuit are connected to the input end of the second fuse 23 and the input end of the second shunt 24, respectively. That is, the first circuit and the second circuit are connected to the first output port of the charging circuit 100 through the second fuse 23 and the second shunt 24, respectively.

[0048] A third line and a fourth line extend between the output end of the second DC / DC rectifier module group 212 and the other end of the first high-voltage DC contactor group 22. The third line and the fourth line are connected to the input end of the third fuse 25 and the input end of the third shunt 26, respectively. That is, the third line and the fourth line are connected to the second output port of the charging circuit 100 through the third fuse 25 and the third shunt 26, respectively.

[0049] It should be noted that by designing the first shunt 13, the second shunt 24, and the third shunt 26 in the DC main input circuit 10 and the DC output circuit 20 respectively, the large current passing through them is divided into several small currents, thereby facilitating the use of a smaller-range DC meter 14 and a dual-circuit DC meter 27 to measure larger currents.

[0050] like Figure 1As shown, in some embodiments of the present invention, the high-voltage DC contactor group further includes a second high-voltage DC contactor group 28 and a third high-voltage DC contactor group 29. The output end of the second fuse 23 and the output end of the second shunt 24 are both connected to one end of the second high-voltage DC contactor group 28. The other end of the second high-voltage DC contactor group 28 is connected to the first output port of the charging circuit 100. The output end of the third fuse 25 and the output end of the third shunt 26 are both connected to one end of the third high-voltage DC contactor group 29. The other end of the third high-voltage DC contactor group 29 is connected to the second output port of the charging circuit 100.

[0051] like Figure 1 and Figure 2 As shown and combined with reference Figure 6 In one specific embodiment, the second high-voltage DC contactor group 28 includes a third high-voltage DC contactor 281 and a fourth high-voltage DC contactor 282. The input of the third high-voltage DC contactor 281 is connected to the output of the second fuse 23, and the output of the third high-voltage DC contactor 281 is connected to the first output port of the charging circuit 100. The input of the fourth high-voltage DC contactor 282 is connected to the output of the second shunt 24, and the output of the fourth high-voltage DC contactor 282 is connected to the first output port of the charging circuit 100. In other words, the output of the third high-voltage DC contactor 281 and the output of the fourth high-voltage DC contactor 282 are both connected to the first output port of the charging circuit 100, forming a DC output loop.

[0052] The third high-voltage DC contactor group 29 includes a fifth high-voltage DC contactor 291 and a sixth high-voltage DC contactor 292. The input of the fifth high-voltage DC contactor 291 is connected to the output of the third fuse 25, and the output of the fifth high-voltage DC contactor 291 is connected to the second output port of the charging circuit 100. The input of the sixth high-voltage DC contactor 292 is connected to the output of the third shunt 26, and the output of the sixth high-voltage DC contactor 292 is connected to the second output port of the charging circuit 100. In other words, the outputs of the fifth high-voltage DC contactor 291 and the sixth high-voltage DC contactor 292 are both connected to the second output port of the charging circuit 100, forming a DC output loop.

[0053] like Figure 1 and Figure 2As shown, in some embodiments of the present invention, the DC main input circuit 10 further includes a fourth high-voltage DC contactor group 15. The fourth high-voltage DC contactor group 15 includes a seventh high-voltage DC contactor 151 and an eighth high-voltage DC contactor 152. The two output lines derived from the DC circuit breaker 11 are connected to the input terminals of the seventh high-voltage DC contactor 151 and the eighth high-voltage DC contactor 152, respectively. The output terminals of the seventh high-voltage DC contactor 151 and the eighth high-voltage DC contactor 152 are connected to the input terminals of the first fuse 12 and the first shunt 13, respectively. The output terminals of the first fuse 12 and the first shunt 13 are connected to the DC output circuit 20, respectively. This forms a complete DC input main circuit 10, which receives DC power from the input port of the charging circuit 100 and outputs it to the DC output circuit 20, thereby replenishing energy for the device to be charged.

[0054] It should be noted that a DC surge protector (SPD) can also be designed in the DC main input circuit 10. A DC surge protector (SPD) is a device specifically designed to protect DC electrical systems from overvoltage transients. It can limit transient overvoltages and discharge surge currents in the electrical system, thereby protecting sensitive electronic equipment. Therefore, a DC surge protector is designed to protect the charging circuit 100 of the present invention.

[0055] like Figure 2 and Figure 6 As shown, in some embodiments of the present invention, both the input port and the output port of the charging circuit 100 are configured with an insulation detection module 50. The insulation detection module 50 is, for example, an insulation monitoring device that monitors the insulation status of the charging circuit 100 to the ground in real time to ensure the safety of the charging process.

[0056] Specifically, in the DC input main circuit 10, an insulation detection module 50 is located between the output terminals of the seventh and eighth high-voltage DC contactors 151 and 152. It performs real-time insulation testing on the first charging gun 300 and the charging circuit 100. When the insulation resistance is detected to be below a set safety threshold, a warning or alarm signal is triggered, prompting personnel to perform inspections and maintenance, thereby ensuring the safety of the charging process. In the DC output circuit 20, two insulation detection modules 50 are located between the output terminals of the third and fourth high-voltage DC contactors 281 and 282, and between the output terminals of the fifth and sixth high-voltage DC contactors 191 and 292. These modules perform real-time insulation testing on the two second charging guns 400 connected to the output ports of the charging circuit 100 and the charging circuit 100, ensuring the safety of the charging process.

[0057] like Figure 1-Figure 3As shown, in some embodiments of the present invention, a first auxiliary circuit 30 is also connected to the input end of the DC / DC rectifier unit 21. The first auxiliary circuit 30 includes a 12V DC-DC switching power supply 31, a 24V DC-DC switching power supply 32, and a 12V battery 33 and a 24V battery 34 connected to the input end of the DC / DC rectifier unit 21. The 12V DC-DC switching power supply 31 and the 24V DC-DC switching power supply 32 are electrically connected to corresponding power consumption systems to supply power to the power consumption systems. The 12V DC-DC switching power supply 31 is connected to the 12V battery 33 to charge the 12V battery 33. The 24V DC-DC switching power supply 32 is connected to the 24V battery 34 to charge the 24V battery 34.

[0058] Alternatively, a 12V battery 33 and a 24V battery 34 are provided and electrically connected to the power system through an isolation diode 35 respectively, thereby supplying power to the power system.

[0059] like Figure 1-Figure 2 as well as Figure 4 As shown, in other embodiments of the present invention, a second auxiliary circuit 40 is further extended from the input end of the DC / DC rectifier unit 21. The second auxiliary circuit 40 includes a 12V AC-DC switching power supply 41 and a 24V AC-DC switching power supply 42. The input ends of the 12V AC-DC switching power supply 41 and the 24V AC-DC switching power supply 42 are connected to the mains, and the output ends are electrically connected to the corresponding power consumption system.

[0060] The 220V AC mains power is input into two circuits. One circuit is connected to the input of a 12V AC-DC switching power supply 41 via a circuit breaker 46. The output of the 12V AC-DC switching power supply 41 is connected to the corresponding power system, thereby supplying power to the power system; or connected to a 12V battery 43, thereby charging the 12V battery 43. The other circuit is connected to the input of a 24V AC-DC switching power supply 42 via a circuit breaker 46. The output of the 24V AC-DC switching power supply 42 is connected to the corresponding power system, thereby supplying power to the power system; or connected to a 24V battery 44, thereby charging the 24V battery 43. Alternatively, the 12V battery 43 and the 24V battery 44 are each electrically connected to the power system via an isolation diode 45 to supply power to the power system. The circuit breaker 46 is a DC miniature circuit breaker (MCB). The main function of a DC miniature circuit breaker is to automatically cut off the circuit when an abnormal situation such as overload or short circuit occurs in the circuit to protect the circuit and equipment from damage. Therefore, a DC miniature circuit breaker is selected in the second auxiliary circuit 40 to protect the second auxiliary circuit 40.

[0061] Furthermore, the second auxiliary circuit 40 is also designed with a 220V to 12V power adapter and a 220V to 24V power adapter, so as to convert the AC 220V into 12V and 24V respectively for use by the power system.

[0062] It should be noted that the power consumption system in the embodiment of the present invention includes the various components in the auxiliary circuit of the present invention, such as the display screen and indicator light, and the battery management system, that is, the first auxiliary circuit 30 or the second auxiliary circuit 40 is used to power the various components in the auxiliary circuit of the present invention and the battery management system.

[0063] like Figure 5 As shown and combined with reference Figure 6 In some embodiments of the present invention, the charging circuit 100 further includes a main control module and an auxiliary control circuit. The auxiliary control circuit includes a touch screen display, an indicator light, an emergency stop switch, a limit switch, a power control module, a charging control module, a communication module, and a cooling fan. The main control module is connected to the touch screen display, the indicator light, the emergency stop switch, the limit switch, the power control module, the charging control module, the communication module, and the cooling fan to control the touch screen display, the indicator light, the emergency stop switch, the limit switch, the power control module, the charging control module, the communication module, and the cooling fan. The touch screen serves as a user interface, displaying system status and receiving user input; the indicator light displays the operating status of the device; the emergency stop switch serves as a safety device, quickly shutting off power and halting all operations in an emergency; the limit switch detects the range of movement of the mechanical device to prevent it from exceeding the safe range; the power control module controls the switching and regulation of the power module; the charging control module manages the battery charging process, including controlling the charging current and voltage and monitoring the battery status; the communication module communicates with a remote server or control center via a wireless communication protocol; and the cooling fan dissipates heat to maintain a suitable operating temperature.

[0064] like Figures 1-6 As shown, an embodiment of the present invention further provides a charging device 1000, comprising: the charging circuit 100 described above and an energy storage device 200. The input port of the charging circuit 100 is electrically connected to the energy storage device 200 for inputting electrical energy from the energy storage device 200. The output port of the charging circuit 100 is electrically connected to a device to be charged for outputting electrical energy to the device to be charged.

[0065] The energy storage device 200 may be, for example, a shared power battery commonly used in electric heavy-duty trucks. The energy from the shared power battery is transferred to the electric vehicle via a charging gun for charging. The shared power battery is a lithium iron phosphate battery, which boasts a high capacity, high safety, and strong vibration resistance, making it suitable for on-board transportation and energy replenishment. The shared power battery can be quickly recharged at a charging station and then transported to locations without grid access, where it can be used with the off-grid charging circuit 100 of the present invention to charge and replenish the electric vehicle.

[0066] like Figure 6 As shown, in some embodiments of the present invention, the input port is electrically connected to the energy storage device 200 through the first charging gun 300, and the output port is electrically connected to the device to be charged through the second charging gun 400. Specifically, a first charging gun 300 is used to draw power from the energy storage device 200 and input it into the charging circuit 100. One or two second charging guns 400 are connected through the charging circuit 100 to input direct current to the device to be charged, supporting even power distribution for charging and energy replenishment. It should be noted that the number of first charging guns 300 and second charging guns 400 should be selected according to actual usage and is not specifically limited here.

[0067] In some specific embodiments, a vehicle-shared power battery is connected to the DC bus of the charging circuit 100, and the output circuit uses two second charging guns 400 to charge an electric vehicle (i.e., a battery) at the same time; or a vehicle-shared power battery is connected to the DC bus, and the output circuit uses two second charging guns 400 to charge an electric vehicle (i.e., two batteries) at the same time; or two charging devices 1000 of the present invention can be used to draw power from the same vehicle-shared power battery at the same time (heavy-duty truck power batteries have dual-gun outputs), and the output circuits of the two devices each use a second charging gun 400 to charge an electric vehicle (i.e., a battery) at the same time.

[0068] Currently, commonly used DC charging stations on the market use three-phase AC input, with charging powers ranging from 11kW to over 500kW. However, as some electric vehicles eliminate onboard chargers, low-power 220V single-phase DC charging stations are becoming increasingly available, such as 7kW wall-mounted DC home chargers. To date, DC charging stations have experienced several power upgrades, from 20kW to 180kW, 240kW, 360kW, 480kW, 600kW, and above. Simultaneously, the charging voltage platform for new energy vehicles is rapidly evolving. For example, passenger cars have moved from a charging voltage of around 300V to over 600V, with many OEMs now offering products with 800V platforms. Charging currents are also rapidly increasing, with some companies releasing high-power charging platforms with 600kW, reaching 1000V and 600A, or even higher. The output voltage and current of traditional DC charging stations are determined by the performance of the AC-DC module. Previously, the voltage range for passenger cars was 200-450V, and the voltage range for commercial vehicles was 300-750V. Later, the general-purpose 200-750V was introduced. With the unification of the auxiliary voltage to 12V, the voltage range of the domestic charging market has gradually become the mainstream with the module output voltage of 200-1000V.

[0069] The charging device 1000 of this utility model uses the electrical energy of a shared vehicle-powered battery as its input, draws power from the shared vehicle-powered battery via a first charging plug 300, and outputs the power to the device being charged via a second charging plug 400, thereby achieving off-grid, portable battery charging. Furthermore, the input and output voltages of this charging device are also adapted to market demand, with an input voltage range of 200-750V and an output voltage range of 200-1000V, to better meet the various vehicle energy replenishment needs currently on the market.

[0070] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0071] In summary, the present invention provides a charging circuit and a charging device, which, as an off-grid mobile charging device, provides a transitional energy replenishment solution for specific scenarios and can replace traditional fixed charging pile equipment. It provides a mobile off-grid charging supply for situations where the vehicle is insufficiently charged while driving on the road and cannot go to a charging station, thereby solving the emergency charging needs of electric vehicles. At the same time, this off-grid mobile charging device is combined with a power transmission and energy replenishment solution of a shared power battery for vehicle storage, which provides a feasible solution for certain specific scenarios (such as existing charging stations) where the charging capacity does not meet the charging demand during peak charging periods. In this scenario, energy can be stored during valley power periods and energy can be supplied to the outside during peak power periods, which not only greatly reduces the cost of power capacity expansion and charging station expansion, but also has certain additional benefits. Moreover, this off-grid mobile charging device has the ability to charge passenger cars, and can charge the same battery at the same time by connecting two machines in parallel, which greatly improves the charging efficiency, and also provides a charging and energy replenishment solution for electric heavy trucks or other electric engineering machinery with large power. Therefore, the charging circuit and charging device of the present invention effectively address vehicle charging needs in certain specific scenarios, and effectively solve the current common problems of mismatch between charging capacity and demand at charging stations, as well as the emergency charging needs of electric vehicles. Therefore, the present invention effectively overcomes the various shortcomings of the existing technology and has high industrial application value.

[0072] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A charging circuit, characterized in that: include: a DC main input circuit, comprising a DC circuit breaker, wherein an input end of the DC circuit breaker is connected to an input port of the charging circuit; A DC output circuit includes a DC / DC rectifier unit and a high-voltage DC contactor group. The input end of the DC / DC rectifier unit is coupled to the output end of the DC circuit breaker, and the output end of the DC / DC rectifier unit is coupled to the input end of the high-voltage DC contactor group. The output end of the high-voltage DC contactor group is connected to the output port of the charging circuit.

2. The charging circuit according to claim 1, wherein: The DC main input circuit further includes a first fuse, a first shunt, and a DC meter connected in parallel with the first shunt. The first fuse and the first shunt are electrically connected to the two output lines of the DC circuit breaker respectively.

3. The charging circuit according to claim 1, wherein: The high-voltage DC contactor group includes a first high-voltage DC contactor group, and the DC / DC rectifier unit includes a first DC / DC rectifier module group and a second DC / DC rectifier module group. The first high-voltage DC contactor group is connected between the output end of the first DC / DC rectifier module group and the output end of the second DC / DC rectifier module group. A lead between the output end of the first DC / DC rectifier module group and one end of the first high-voltage DC contactor group is coupled to the first output port of the charging circuit, and a lead between the output end of the second DC / DC rectifier module group and the other end of the first high-voltage DC contactor group is coupled to the second output port of the charging circuit.

4. The charging circuit according to claim 3, wherein: The DC output circuit also includes: a second fuse, a second shunt, a third fuse, a third shunt and a dual-circuit DC meter; a first circuit and a second circuit are led out between the output end of the first DC / DC rectifier module group and one end of the first high-voltage DC contactor group; a third circuit and a fourth circuit are led out between the output end of the second DC / DC rectifier module group and the other end of the first high-voltage DC contactor group; the first circuit and the second circuit are respectively connected to the input end of the second fuse and the input end of the second shunt; the third circuit and the fourth circuit are respectively connected to the input end of the third fuse and the input end of the third shunt; the dual-circuit DC meter is connected in parallel with the second shunt and the third shunt, respectively.

5. The charging circuit according to claim 4, characterized in that: The high-voltage DC contactor group also includes a second high-voltage DC contactor group and a third high-voltage DC contactor group, the output end of the second fuse and the output end of the second shunt are both connected to one end of the second high-voltage DC contactor group, and the output end of the third fuse and the output end of the third shunt are both connected to one end of the third high-voltage DC contactor group.

6. The charging circuit according to claim 1, wherein: The input end of the DC / DC rectifier unit also leads to a first auxiliary circuit, which includes a 12V DC-DC switching power supply, a 24V DC-DC switching power supply, a 12V battery, and a 24V battery connected to the input end of the DC / DC rectifier unit. The 12V DC-DC switching power supply and the 24V DC-DC switching power supply are electrically connected to the corresponding power consumption system; the 12V battery and the 24V battery are respectively electrically connected to the power consumption system through an isolation diode; the 12V DC-DC switching power supply is connected to the 12V battery, and the 24V DC-DC switching power supply is connected to the 24V battery.

7. The charging circuit according to claim 1, wherein: The input end of the DC / DC rectifier unit also leads to a second auxiliary circuit, which includes a 12V AC-DC switching power supply and a 24V AC-DC switching power supply; the input ends of the 12V AC-DC switching power supply and the 24V AC-DC switching power supply are connected to the mains, and the output ends are electrically connected to the corresponding power consumption system.

8. The charging circuit according to claim 1, wherein: The input port and the output port of the charging circuit are both configured with insulation detection modules.

9. A charging device, characterized in that: include: electrical energy storage devices; The charging circuit according to any one of claims 1 to 8, wherein an input port of the charging circuit is electrically connected to the electric energy storage device for inputting electric energy from the electric energy storage device; The output port of the charging circuit is electrically connected to the device to be charged, and is used to output electrical energy to the device to be charged.

10. The charging device according to claim 9, characterized in that The input port is electrically connected to the electric energy storage device through a first charging gun, and the output port is electrically connected to the device to be charged through a second charging gun.

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