Multi-input universal alternating current charging circuit and equipment

Abstract

The invention provides a multi-path input general alternating current charging circuit and equipment, in the multi-path input general alternating current charging circuit, a plurality of alternating current-direct current input modules and a power factor correction module are arranged, and the plurality of alternating current-direct current input modules are connected in parallel and then are connected with the power factor correction module; each alternating current-direct current input module is connected with the mains supply, so that each alternating current-direct current input module inputs one path of alternating current, and the plurality of alternating current-direct current input modules are connected in parallel and then are connected with the power factor correction module, so that the current corresponding to the direct current provided for the power factor correction module is the sum of the current corresponding to each path of direct current; therefore, the power factor correction module can obtain high-voltage direct current, the output power of the power factor correction module is increased, and the charging power is improved, so that the purpose of quickly and efficiently charging the electric vehicle by using alternating current is achieved, the charging time is shortened, and the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle charging, and in particular to a charging circuit and device for multi-channel universal alternating current input. Background Art

[0002] As a new type of transportation that is safe, less polluting and low in cost, electric vehicles have developed rapidly in recent years and have been widely used in household, freight, logistics, passenger transport and other occasions. However, the number and distribution of charging piles are currently small, and electric vehicles cannot be charged conveniently, timely and economically, which has become a problem that plagues the majority of electric vehicle users.

[0003] Therefore, existing electric vehicles are generally equipped with mobile AC slow-charging electric vehicle chargers, which are convenient for electric vehicle users to use household 220V AC power for low-speed charging when they are not in urgent need of the vehicle. However, when electric vehicle users are in urgent need of the vehicle, for example, when the battery is insufficient during a long-distance trip and it is difficult to find a charging pile, they can only consider charging with a mobile AC slow-charging electric vehicle charger. However, this charging method is slow and it is difficult to quickly charge the electric vehicle to the required level, which seriously affects the user experience and thus restricts the popularity of electric vehicles. Summary of the invention

[0004] The present application provides a charging circuit and device with multi-channel universal alternating current input, so as to solve the technical problems mentioned in the background technology.

[0005] In a first aspect, the present application provides a charging circuit for a multi-channel universal AC power input, comprising: at least two AC-DC input modules and a power factor correction module, each of the AC-DC input modules comprising: an AC input unit and a rectification and isolation unit; the at least two AC-DC input modules are connected in parallel to the power factor correction module, and the AC input unit and the rectification and isolation unit are connected in series; The AC input unit is used to connect to the mains, obtain AC power and then transmit the AC power to the rectification and isolation unit; The rectifying and isolating unit is used to convert the alternating current transmitted by the alternating current input unit into pulsating direct current, and to isolate the AC-DC input module corresponding to the rectifying and isolating unit from other AC-DC input modules; The at least two AC-DC input modules are connected in parallel, and are used to transmit the pulsating DC power in parallel to the power factor correction module; The power factor correction module is used to adjust the power factor of the pulsating direct current, obtain direct current with a target voltage value, and charge the electric vehicle based on the direct current with the target voltage value.

[0006] Optionally, the AC-DC input module further includes: a filtering unit; The filtering unit is connected to the AC input unit and the rectifying and isolating unit; The filtering unit is configured to filter the alternating current delivered by the AC input unit to the rectifying and isolating unit, so as to improve the quality of the alternating current input to the rectifying and isolating unit.

[0007] Optionally, the filtering unit includes: a first capacitor, a second capacitor, and a third capacitor; The first capacitor is connected between the first output terminal and the second output terminal of the AC input unit, the second capacitor is connected between the second output terminal and the third output terminal of the AC input unit, and the third capacitor is connected between the first output terminal and the third output terminal of the AC input unit; The first capacitor, the second capacitor, and the third capacitor are configured to filter the alternating current input by the AC input unit.

[0008] Optionally, the filtering unit further includes: a common mode inductor; The first connection point of the common mode inductor is connected to the first output terminal of the AC input unit, the second connection point of the common mode inductor is connected to the third capacitor, the third connection point of the common mode inductor is connected to the second output terminal of the AC input unit, and the fourth connection point of the common mode inductor is connected to the second capacitor; The common mode inductor is configured to cooperate with the first capacitor, the second capacitor, and the third capacitor to filter the alternating current input by the AC input unit.

[0009] Optionally, the rectifying and isolating unit includes: a bridge rectifier circuit.

[0010] Optionally, the bridge rectifier circuit includes: a first diode, a second diode, a third diode, and a fourth diode; The fourth diode and the first diode are connected in series, the second diode and the third diode are connected in series, the third capacitor is further connected to the first input terminal between the fourth diode and the first diode, the second capacitor is further connected to the second input terminal between the second diode and the third diode, the first output terminal between the first diode and the third diode is connected to the first end of the power factor correction module, and the second output terminal between the fourth diode and the second diode is connected to the second end of the power factor correction module.

[0011] Optionally, the first output terminal of the AC input unit is a live wire output terminal, the second output terminal of the AC input unit is a neutral wire output terminal, and the third output terminal of the AC input unit is a ground wire output terminal.

[0012] Optionally, the number of the AC-DC input modules is three.

[0013] In a second aspect, the present application provides a charging device for multi-channel input general alternating current, including: a multi-channel input general alternating current charging circuit, a power supply interface, and a charging interface as described in any one of the first aspects; The power supply interface is connected to each of the AC-DC input modules, and the charging interface is connected to the power factor correction module; The power supply interface is used to connect to the charging interface of the commercial power so that the AC-DC input module obtains alternating current; The charging interface is used to connect to the DC-DC charger of the electric vehicle to charge the electric vehicle.

[0014] Optionally, the model of the power supply interface can be a two-pole plug or a three-pole plug.

[0015] In the multi-channel input general alternating current charging circuit and device provided by the present application, in the multi-channel input general alternating current charging circuit, a plurality of AC-DC input modules and a power factor correction module are provided, and the plurality of AC-DC input modules are connected in parallel and then connected to the power factor correction module. Each AC-DC input module is connected to the commercial power. In this way, each AC-DC input module inputs a path of alternating current. Also, because the plurality of AC-DC input modules are connected in parallel and then connected to the power factor correction module, therefore, the input power of the multi-channel input general alternating current charging circuit in the present application is the sum of the input powers provided by the plurality of AC-DC input modules. The current corresponding to the direct current provided to the power factor correction module is the sum of the currents corresponding to each path of direct current. That is to say, the current input to the power factor correction module increases. Therefore, the power factor correction module can obtain high-voltage direct current, so that the output power of the power factor correction module increases. Therefore, the power provided to the DC-DC charger of the electric vehicle also increases accordingly, improving the charging power of the DC-DC charger of the electric vehicle. Thus, the purpose of quickly and efficiently charging the electric vehicle using the commercial power is achieved, the charging duration is shortened, and the user experience is improved. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0017] Figure 1Schematic diagram of the charging circuit for multi-input general alternating current provided by an embodiment of the present application; Figure 2 Schematic diagram of the charging circuit for multi-input general alternating current provided by another embodiment of the present application; Figure 3 Circuit diagram of the charging circuit for multi-input general alternating current provided by another embodiment of the present application; Figure 4 Schematic diagram of the charging device for multi-input general alternating current provided by an embodiment of the present application. Detailed implementation manners

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall also fall within the scope of protection of the present application.

[0019] With the increasingly prominent energy and environmental problems and the support of national policies, electric vehicles and plug-in hybrid electric vehicles (referred to as electric vehicles) have developed very rapidly, and the demand for corresponding electric vehicle charging devices has become increasingly obvious.

[0020] In the prior art, there are mobile AC slow-charging electric vehicle chargers and DC medium-fast charging electric vehicle chargers on the market. Among them, the DC medium-fast charging electric vehicle chargers have a relatively fast charging speed, but require special charging piles. Currently, the installation of charging piles is still relatively small, especially in suburban and rural areas. Moreover, even in cities, due to the small installation volume, it is difficult to meet the charging needs of users. Therefore, generally when users do not use the vehicle, they charge the electric vehicle through a mobile AC slow-charging electric vehicle charger.

[0021] For a mobile AC slow-charging electric vehicle charger, after connecting to the mains power and converting the alternating current into direct current, it charges the electric vehicle. Although this charging method is used to charge the electric vehicle when the user is not in a hurry to use the vehicle, when the user urgently needs to use the vehicle and it is difficult to charge through a charging pile, although the charging speed of the mobile AC slow-charging electric vehicle charger is slow, this charging method has to be chosen. For example, when a user travels long distances by car and the vehicle's battery is about to run out during the journey and needs to be charged in a timely manner, it is difficult to find a charging pile in time, and the vehicle can be charged along the way through a mobile AC slow-charging electric vehicle charger; or, in suburban and rural areas where the distribution of charging piles is less, when in urgent need of using the vehicle, the electric vehicle can also be charged through a mobile AC slow-charging electric vehicle charger.

[0022] Therefore, although charging an electric vehicle through a mobile AC slow charger can also charge the electric vehicle, when the user urgently needs to charge and it is difficult to charge through a charging pile, this method is still difficult to meet the user's needs.

[0023] Therefore, to solve the problem of low charging efficiency in charging an electric vehicle with mains power in the prior art, multiple input terminals can be set, and each input terminal is connected to the mains power. Moreover, since the mains power provides alternating current, when the alternating current accessed by multiple input terminals connected to the mains power has different phases, different voltages, or is reversed, it will cause faults such as short circuits. Therefore, it is also necessary to rectify and isolate the alternating current input for each path to isolate the alternating current of this path from the alternating current input of other paths and avoid faults such as short circuits. Therefore, this embodiment provides a charging circuit and device for multi-path input general alternating current. In the charging circuit for multi-path input general alternating current, multiple AC-DC input modules are set, and each AC-DC input module is connected to the mains power. In this way, each AC-DC input module inputs a path of alternating current, converts the alternating current into pulsating direct current, and then transports it to the power factor correction module. Also, because multiple AC-DC input modules are connected in parallel to the power factor correction module, the direct current provided to the power factor correction module corresponds to the sum of the currents corresponding to each path of direct current. That is to say, the current input to the power factor correction module increases, and the power increases. Therefore, the power factor correction module can obtain high-voltage direct current, increasing the output power of the power factor correction module, thereby achieving the purpose of quickly and efficiently charging an electric vehicle with mains power, shortening the charging duration, and improving the user experience.

[0024] Figure 1 It is a schematic structural diagram of a charging circuit for multi-path input general alternating current provided by an embodiment of the present application. As Figure 1 shown, the charging circuit 100 for multi-path input general alternating current includes: at least two AC-DC input modules 110 and a power factor correction module 120. Among them, each AC-DC input module includes: an AC input unit 111 and a rectification isolation unit 112.

[0025] At least two AC-DC input modules 110 are connected in parallel to the power factor correction module 120, and the AC input unit 111 and the rectification isolation unit 112 are connected in series; The AC input unit 111 is used to be connected to the mains power, obtain alternating current, and then transport the alternating current to the rectification isolation unit 112; The rectification isolation unit 112 is used to convert the alternating current transported by the AC input unit 111 into pulsating direct current, and isolate the AC-DC input module corresponding to the rectification isolation unit 112 from other AC-DC input modules; At least two AC-DC input modules 110 are connected in parallel and used to transmit the pulsating direct current in parallel to the power factor correction module 120; The power factor correction module 120 is used to adjust the power factor of the pulsating direct current, obtain the direct current with the target voltage value, and charge the electric vehicle based on the direct current with the target voltage value.

[0026] In this embodiment, the mains power is taken as an example of household alternating current for illustration: the household alternating current provides an alternating current of 10 A. When charging an electric vehicle through the household alternating current in the prior art, the charging power is low, resulting in low charging efficiency and long charging time. Therefore, multiple AC-DC input modules 110 are provided. For example, as Figure 1 shown, the number of AC-DC input modules 110 is 3. Among them, the 3 AC-DC input modules 110 are independent of each other and connected in parallel, so as to obtain an alternating current power supply of 10 A through multiple AC-DC input modules 110.

[0027] Among them, for any AC-DC input module 110, the AC input unit 111 and the rectifying and isolating unit 112 are connected in series. For the AC input unit 111, it is connected to the household alternating current, accesses the household alternating current, and inputs the household alternating current to the rectifying and isolating unit 112. The rectifying and isolating unit 112 rectifies the household alternating current to obtain pulsating direct current.

[0028] Among them, for alternating current, when one of the AC input units 111 in this embodiment is connected to the A-phase power supply and the other AC input unit 111 is connected to the B-phase power supply; or, when the power supply accessed by one AC input unit 111 is opposite to the power supply accessed by the other AC input unit 111; or, when the voltage values of the power supplies accessed by one AC input unit 111 and the other AC input unit 111 are different, if these multiple AC input units 111 are connected in parallel, faults such as input short circuit, explosion, and line fire will occur due to different phases and voltages. Therefore, in this application, in order to avoid the mutual influence between the alternating currents input by multiple AC input units 111 and obtain a high-current alternating current conveniently and safely, the rectifying and isolating unit 112 is provided in each AC-DC input module 110 in this embodiment, and the rectifying and isolating unit 112 is located behind the AC input unit 111, so that the rectifying and isolating unit 112 can not only rectify the alternating current, but also isolate the inputs of multiple alternating currents with different phases, realize the expansion between the output ends of the rectifying and isolating unit 112, and increase the current input to the power factor correction module 120. Therefore, this embodiment provides a general, feasible, safe and easy-to-implement expansion circuit.

[0029] After the power factor correction module 120 receives the pulsating direct current, it processes the pulsating direct current to obtain a stable direct current with high voltage and high power factor. For example, a direct current with a voltage of 440V is obtained, and the power factor can generally reach more than 0.9. It should be noted that the specific circuit structure of the power factor correction module 120 can refer to the prior art. For example, the specific circuit structure of the power factor correction module 120 can refer to the technical solution with the publication number CN103563228A, or the technical solution with the publication number CN109802474B, which will not be elaborated here.

[0030] After the power factor correction module 120 obtains a stable direct current with high voltage and high power factor, it supplies it to the DC-DC charger of the electric vehicle. The DC-DC charger of the electric vehicle charges the electric vehicle with this high-voltage and high-power-factor direct current. Among them, since the current provided to the power factor correction module is also the sum of the currents provided by each AC-DC input module, the power factor correction module can output a direct current with a high voltage, so that the output power of the power factor correction module also increases accordingly. Therefore, the power of the DC-DC charger provided to the electric vehicle also increases, thereby increasing the charging power when the DC-DC charger of the electric vehicle charges the electric vehicle.

[0031] In this embodiment, exemplarily, the household alternating current connected by at least two AC-DC input modules 110 is generally of the same type of alternating current power supply. For example, for any AC-DC input module 110, if the AC input unit 111 is connected to a single-phase 220V power supply, the alternating current input through the AC input unit 111 is 220V, and the current of the household alternating current is generally 10A. Or, the AC input unit 111 can also be connected to a three-phase 380V star-connected power supply. Since the 3 AC-DC input modules 110 are independent of each other and in parallel, the input power is 3 * 10A * 220V = 6600W.

[0032] At this time, if the prior art is adopted, the input power is 220V * 10A = 2200W. Therefore, compared with the prior art in this embodiment, on the basis of inputting the same household alternating current, by setting multiple AC-DC input modules 110 and making the multiple AC-DC input modules 110 in parallel, the input power is increased. In this way, on the basis of the same power factor correction module structure, that is, on the basis of the same power factor, the charging power is increased, thereby accelerating the charging efficiency, shortening the charging duration, and improving the user experience.

[0033] It should be noted that the scenario provided in this embodiment is for charging an electric vehicle at home. Of course, the commercial power accessed in the factory can also be used to charge the electric vehicle, and this application does not limit this.

[0034] Optionally, as Figure 2 shown, the AC-DC input module 110 further includes: a filtering unit 113; The filtering unit 113 is connected to the AC input unit 111 and the rectifying and isolating unit 112; The filtering unit 113 is configured to filter the alternating current delivered by the AC input unit 111 to the rectifying and isolating unit, and improve the quality of the alternating current input to the rectifying and isolating unit 112.

[0035] In this embodiment, when accessing household alternating current, the voltage and current of the household alternating current will fluctuate due to interference. Therefore, a filtering unit 113 is provided in the AC-DC input module 110. Among them, the filtering unit 113 is connected to the power factor correction module 120, the AC input unit 111, and the rectifying and isolating unit 112.

[0036] Among them, optionally, as Figure 3 shown, the filtering unit 113 includes: a first capacitor C1, a second capacitor C2, and a third capacitor C3; The first capacitor C1 is connected between the first output terminal and the second output terminal of the AC input unit 111, the second capacitor C2 is connected between the second output terminal and the third output terminal of the AC input unit 111, and the third capacitor C3 is connected between the first output terminal and the third output terminal of the AC input unit 111.

[0037] Among them, the first capacitor, the second capacitor, and the third capacitor are used to filter the alternating current input by the AC input unit.

[0038] Specifically, the AC input unit 111 is provided with a first output terminal, a second output terminal, and a third output terminal. Among them, the first output terminal of the AC input unit is the live wire output terminal L, the second output terminal of the AC input unit is the neutral wire output terminal N, and the third output terminal of the AC input unit is the ground wire output terminal G. A capacitor is provided between any two output terminals. That is, a first capacitor C1 is installed between the live wire output terminal L and the neutral wire output terminal N of the AC input unit 111, a second capacitor C2 is installed between the neutral wire output terminal N and the ground wire output terminal G of the AC input unit 111, and a third capacitor C3 is installed between the live wire output terminal L and the ground wire output terminal G of the AC input unit 111 to filter the household alternating current input by the AC input unit 111, remove the noise in the alternating current, and improve the quality of the alternating current input to the rectifying and isolating unit 112.

[0039] By setting up a filtering unit, the alternating current delivered by the AC input unit 111 to the rectifying and isolating unit 112 is filtered to maintain the stability of voltage and current, improve the quality of the alternating current input to the rectifying and isolating unit 112, so that the rectifying and isolating unit 112 outputs stable direct current.

[0040] Optionally, as Figure 3 shown, the filtering unit 113 further includes: a common-mode inductor 114; The first connection point of the common-mode inductor 114 is connected to the first output terminal of the AC input unit 111, the second connection point of the common-mode inductor 114 is connected to the third capacitor C3, the third connection point of the common-mode inductor 114 is connected to the second output terminal of the AC input unit 111, and the fourth connection point of the common-mode inductor 114 is connected to the second capacitor C2; The common-mode inductor 114 is used to cooperate with the first capacitor C1, the second capacitor C2, and the third capacitor C3 to filter the alternating current input by the AC input unit.

[0041] In this embodiment, in terms of the connection relationship, since the first connection point of the common-mode inductor 114 is connected to the first output terminal of the AC input unit 111, the second connection point of the common-mode inductor 114 is connected to the third capacitor C3, the third connection point of the common-mode inductor 114 is connected to the second output terminal of the AC input unit 111, and the fourth connection point of the common-mode inductor 114 is connected to the second capacitor C2, and since both the second capacitor C2 and the third capacitor C3 are connected to the ground wire input terminal G, therefore, the common-mode inductor 114 is equivalent to being connected between the live wire output terminal L and the ground wire output terminal G, and between the neutral wire output terminal N and the ground wire output terminal G, so as to cooperate with the first capacitor C1, the second capacitor C2, and the third capacitor C3 to filter the electromagnetic interference in the household alternating current input by the AC input unit 111, further ensuring the quality of the alternating current input to the rectifying and isolating unit 112.

[0042] Optionally, the rectifying and isolating unit 112 includes a bridge rectifier circuit.

[0043] In this embodiment, the rectifying and isolating unit 112 can select a bridge rectifier circuit. Specifically, as Figure 3 shown, the bridge rectifier circuit includes: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4.

[0044] The fourth diode D4 and the first diode D1 are connected in series, the second diode D2 and the third diode D3 are connected in series, the third capacitor C3 is also connected to the first input terminal between the fourth diode D4 and the first diode D1, the second capacitor C2 is also connected to the second input terminal between the second diode D2 and the third diode D3, the first output terminal between the first diode D1 and the third diode D3 is connected to the first terminal of the power factor correction module 120, and the second output terminal between the fourth diode D4 and the second diode D2 is connected to the second terminal of the power factor correction module 120.

[0045] In this embodiment, since the purpose of this application is to improve the charging efficiency of electric vehicles, the rectification isolation unit 112 uses a bridge rectifier circuit, which rectifies using both half-cycles of the AC signal, and can output direct current with a relatively high voltage value, thereby increasing the voltage value input to the power factor correction module 120, and further increasing the charging power.

[0046] Moreover, the bridge rectifier circuit is composed of diodes, and diodes have the characteristic of unidirectional conduction. Therefore, circuit isolation can be achieved through the bridge rectifier circuit, preventing the AC current input by one of the AC-DC input modules 110 from flowing into other AC-DC input modules 110, that is, isolating the AC-DC input module 110 from other AC-DC input modules 110, and improving circuit safety.

[0047] Figure 4 It is a structural schematic diagram of a charging device for multi-input general alternating current provided by an embodiment of this application. As Figure 4 shown, the charging device 200 for multi-input general alternating current includes: a power supply interface 210, a charging interface 220, and the multi-input general alternating current charging circuit 100 of any of the above embodiments.

[0048] Among them, a power supply interface 210 is connected to each AC-DC input module 110, and the charging interface 220 is connected to the power factor correction module 120; The power supply interface 210 is used to connect to the charging interface of the mains power to enable the AC-DC input module 110 to obtain alternating current; The charging interface 220 is used to connect to the DC-DC charger of the electric vehicle to charge the electric vehicle.

[0049] In this embodiment, the power supply interface 210 is used to connect to the charging interface 220 of the household alternating current. Among them, as Figure 4As shown, the power supply interface 210 can be in the form of a plug. For example, the model of the power supply interface 210 can be a two-pole plug or a three-pole plug. Among them, the two-pole plug is used to connect to a household two-hole socket, and the three-pole plug is used to connect to a household three-hole socket. Since two-hole sockets and three-hole sockets are common sockets, setting the power supply interface 210 as a two-pole plug or a three-pole plug facilitates charging of the electric vehicle.

[0050] Optionally, the model of the power supply interface 210 can also be other styles. For example, it is the same as the plug model of the air conditioner. This application does not limit this.

[0051] It should be noted that in this application, if there are multiple power supply interfaces 210 on a charging device for multi-input general alternating current, the models of each power supply interface 210 can be the same or different. This application does not limit this.

[0052] In addition, the charging device for multi-input general alternating current in this embodiment can exist independently of the electric vehicle and does not need to be fixedly installed in the electric vehicle. The charging device for multi-input general alternating current can convert the alternating current provided by the grid power (i.e., household alternating current) into direct current to charge the charging battery of the electric vehicle. The charging device for multi-input general alternating current does not need to be fixedly installed in the electric vehicle, which is convenient to carry and move, reduces the burden on the electric vehicle, reduces the manufacturing difficulty of the electric vehicle, and is applicable to various electric vehicles.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging circuit for multi-channel input general alternating current, characterized in that, Comprising: At least two AC-DC input modules and a power factor correction module, each of the AC-DC input modules comprising: an AC input unit and a rectification isolation unit; The at least two AC-DC input modules are connected in parallel and then connected to the power factor correction module, and the AC input unit and the rectification isolation unit are connected in series; The AC input unit is configured to be connected to the mains power, and after obtaining alternating current, deliver the alternating current to the rectification isolation unit; The rectification isolation unit is configured to convert the alternating current delivered by the AC input unit into pulsating direct current, and isolate the corresponding AC-DC input module of the rectification isolation unit from the other AC-DC input modules; The at least two AC-DC input modules being connected in parallel are configured to deliver the pulsating direct current in parallel to the power factor correction module; The power factor correction module is configured to adjust the power factor of the pulsating direct current, obtain direct current with a target voltage value, and charge an electric vehicle based on the direct current with the target voltage value.

2. The charging circuit for multi-channel input general alternating current according to claim 1, wherein The AC-DC input module further comprises: a filtering unit; The filtering unit is connected to the AC input unit and the rectification isolation unit; The filtering unit is configured to perform filtering processing on the alternating current delivered by the AC input unit to the rectification isolation unit, and improve the quality of the alternating current input to the rectification isolation unit.

3. The charging circuit for multi-input general alternating current according to claim 2, wherein The filtering unit comprises: a first capacitor, a second capacitor, and a third capacitor; The first capacitor is connected between the first output terminal and the second output terminal of the AC input unit, the second capacitor is connected between the second output terminal and the third output terminal of the AC input unit, and the third capacitor is connected between the first output terminal and the third output terminal of the AC input unit; The first capacitor, the second capacitor, and the third capacitor are configured to filter the alternating current input by the AC input unit.

4. The charging circuit for multi-channel input general alternating current according to claim 3, characterized in that, The filtering unit further comprises: a common mode inductor; The first connection point of the common mode inductor is connected to the first output terminal of the AC input unit, the second connection point of the common mode inductor is connected to the third capacitor, the third connection point of the common mode inductor is connected to the second output terminal of the AC input unit, and the fourth connection point of the common mode inductor is connected to the second capacitor; The common mode inductor is configured to cooperate with the first capacitor, the second capacitor, and the third capacitor to filter the alternating current input by the AC input unit.

5. The charging circuit for multi-input general alternating current according to claim 3, wherein, The rectification isolation unit comprises: a bridge rectifier circuit.

6. The charging circuit for multi-channel input general alternating current according to claim 5, characterized in that, The bridge rectifier circuit comprises: a first diode, a second diode, a third diode, and a fourth diode; The fourth diode and the first diode are connected in series, the second diode and the third diode are connected in series, the third capacitor is further connected to the first input terminal between the fourth diode and the first diode, the second capacitor is further connected to the second input terminal between the second diode and the third diode, the first output terminal between the first diode and the third diode is connected to the first end of the power factor correction module, and the second output terminal between the fourth diode and the second diode is connected to the second end of the power factor correction module.

7. The charging circuit for multi-input general alternating current according to claim 3, characterized in that, The first output terminal of the AC input unit is the live wire output terminal, the second output terminal of the AC input unit is the neutral wire output terminal, and the third output terminal of the AC input unit is the ground wire output terminal.

8. The charging circuit for multi-channel input general alternating current according to any one of claims 1-7, characterized in that The number of the AC-DC input modules is three.

9. A charging device for multi-channel input general alternating current, characterized in that, Comprising a charging circuit for multi-path input general alternating current, a power supply interface and a charging interface as described in any one of claims 1-7; Each of the AC-DC input modules is connected with the power supply interface, and the charging interface is connected with the power factor correction module; The power supply interface is used for connecting with the charging interface of the commercial power so that the AC-DC input module obtains alternating current; The charging interface is used for connecting with the DC-DC charger of the electric vehicle to charge the electric vehicle.

10. The charging device for multi-input general alternating current according to claim 9, characterized in that, The model of the power supply interface can be a two-pole plug or a three-pole plug.

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