Double-direct-current output charging device, equipment and system of electric automobile

Abstract

The utility model provides a double direct current output charging device, equipment and system of an electric automobile. The charging device comprises a control module, an electromagnetic interference input module, an active power factor correction module, a DC / DC conversion module, a first output module and a second output module. The electromagnetic interference input module is used for suppressing electromagnetic interference of the charging device; the active power factor correction module is used for converting alternating current into first direct current and transmitting the first direct current to the DC / DC conversion module and the first output module; the DC / DC conversion module is used for performing voltage regulation on the first direct current, outputting second direct current and transmitting the second direct current to the second output module; the first output module and the second output module are used for charging a battery of the electric vehicle. The charging device can adapt to different charging scenes and requirements, the power factor of the charging device is improved through the power factor correction technology, and the energy utilization efficiency of the charging system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle charging, and particularly relates to a dual DC output charging device, equipment and system for electric vehicles. Background Art

[0002] As a representative of new energy vehicles, electric vehicles use electric energy as the power source and show great potential in reducing environmental pollution, alleviating energy crises, and promoting the harmonious development of the environment and humanity. However, the popularization and development of electric vehicles still face many challenges, among which the charging problem is one of the most critical factors. The charging device of an electric vehicle plays a crucial role in the charging process of the electric vehicle. It is responsible for converting the alternating current of the power grid into direct current and transmitting it safely and efficiently to the battery pack of the electric vehicle.

[0003] Most charging devices for electric vehicles adopt a two-stage architecture. The first stage is a rectification device that rectifies alternating current into direct current. The rectification device usually uses efficient and reliable power electronics technology to achieve, thereby improving the efficiency and stability of the entire charging system. The second stage usually uses a high-efficiency and wide-range isolation DC / DC converter. The main function of this stage is to isolate, regulate voltage and filter the rectified direct current to meet the specific charging requirements of the electric vehicle battery pack. Through the isolation and voltage regulation functions, the DC / DC converter can ensure the safety and efficiency of the charging process. At the same time, the DC output voltage range of the charging device is usually relatively wide, covering a voltage range of 200V to 1000V, adapting to the charging requirements of different brands and models of electric vehicle battery packs. However, due to the two-stage conversion architecture adopted by the charging device, there are certain energy losses in each stage, such as rectification loss, switching loss, conduction loss, etc. These losses will reduce the conversion efficiency of the entire charging system. Summary of the Utility Model

[0004] In view of the above deficiencies of the prior art, the utility model provides a dual DC output charging device, equipment and system for electric vehicles, effectively solving the problem that the existing charging device has energy losses, resulting in low conversion efficiency of the charging system.

[0005] In a first aspect, the utility model provides a dual DC output charging device for an electric vehicle. The charging device includes a control module, an electromagnetic interference input module, an active power factor correction module, a DC / DC conversion module, a first output module, and a second output module, wherein:

[0006] The electromagnetic interference input module is respectively connected to the active power factor correction module and the control module, and the electromagnetic interference input module is used to suppress the electromagnetic interference of the charging device;

[0007] The active power factor correction module is respectively connected to the DC / DC conversion module, the control module, and the first output module. The active power factor correction module is used to convert alternating current into first direct current and transmit the first direct current to the DC / DC conversion module and the first output module;

[0008] The DC / DC conversion module is respectively connected to the control module and the second output module. The DC / DC conversion module is used to adjust the voltage of the first direct current, output second direct current, and transmit the second direct current to the second output module;

[0009] The first output module and the second output module are connected to the control module. The first output module and the second output module are used to charge electric vehicle batteries with different output voltages.

[0010] Further, the charging device further includes an active power factor correction driving module. The active power factor correction driving module is respectively connected to the control module and the active power factor correction module. The active power factor correction driving module is used to receive a first control signal sent by the control module, convert the first control signal into a switching element signal, and transmit the switching element signal to the active power factor correction module.

[0011] Further, the charging device further includes a DC / DC conversion driving module. The DC / DC conversion driving module is respectively connected to the control module and the DC / DC conversion module. The DC / DC conversion driving module is used to receive a second control signal sent by the control module, convert the second control signal into a voltage conversion signal, and transmit the voltage conversion signal to the DC / DC conversion module.

[0012] Further, the active power factor correction module includes a rectification unit, a switching unit, and an output filtering unit, where:

[0013] The rectification unit is respectively connected to the electromagnetic interference input module and the switching unit. The rectification unit is used to convert the alternating current into high-voltage pulsating direct current;

[0014] The switching unit is connected to the rectification unit. The switching unit is used to convert the high-voltage pulsating direct current into stable direct current and control the waveform of the input current;

[0015] The output filtering unit is connected to the switching unit. The output filtering unit is used to filter the stable direct current and output the first direct current to the DC / DC conversion module and the first output module.

[0016] Further, the DC / DC conversion module includes a power conversion unit and an output unit, where:

[0017] The power conversion unit is connected to the active power factor correction module. The power conversion unit is used to convert the voltage of the first direct current and output the second direct current.

[0018] The output unit is connected to the power conversion unit. The output unit filters the second direct current and transmits it to the second output module.

[0019] Further, the active power factor correction module is a continuous current mode control type topology structure and / or a discontinuous current mode control type topology structure.

[0020] Further, the DC / DC conversion module is one of a buck DC / DC converter, a boost DC / DC converter, and a buck-boost DC / DC converter.

[0021] Further, the control module is one or more of a digital signal processor, a single-chip microcomputer, and a microcontroller chip.

[0022] In a second aspect, the present utility model provides a charging device, and the charging device includes the dual direct current output charging device for an electric vehicle as described in the first aspect of the present utility model.

[0023] In a third aspect, the present utility model provides a charging system, and the charging system includes a power supply device and multiple charging devices as described in the second aspect of the present utility model.

[0024] The dual direct current output charging device, device, and system for an electric vehicle provided by the present utility model lead out a direct current output port from the outside of the active power factor correction module, and at the same time retain the output direct current interface of the second stage to form two direct current output terminals. The two output terminals can be independently controlled, and the output voltage and current can be adjusted according to actual needs to achieve more refined energy management, so that the charging device can adapt to different charging scenarios and requirements, increasing the compatibility and expandability of the system. At the same time, through the power factor correction technology, the power factor of the charging device is improved, and the harmonic pollution is reduced, thereby improving the energy utilization efficiency of the charging system. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is the first schematic diagram of the structure of the dual DC output charging device for electric vehicles provided by the embodiments of the present utility model;

[0027] Figure 2 It is the schematic diagram of the structure of the active power factor correction module in the embodiments of the present utility model;

[0028] Figure 3 It is the schematic diagram of the structure of the DC / DC conversion module in the embodiments of the present utility model;

[0029] Figure 4 It is the second schematic diagram of the structure of the dual DC output charging device for electric vehicles provided by the embodiments of the present utility model;

[0030] Figure 5 It is the schematic diagram of the structure of the charging device provided by the embodiments of the present utility model;

[0031] Figure 6 It is the schematic diagram of the structure of the charging system provided by the embodiments of the present utility model.

[0032] Main element symbol description: 100, dual DC output charging device; 110, electromagnetic interference input module; 120, active power factor correction module; 121, rectification unit; 122, switching unit; 123, output filtering unit; 130, DC / DC conversion module; 131, power conversion unit; 132, output unit; 140, first output module; 150, second output module; 160, control module; 170, active power factor correction driving module; 180, DC / DC conversion driving module; 200, first electric vehicle battery; 300, second electric vehicle battery; 400, charging device; 500, charging system; 600, power supply device. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be further described clearly and completely below with reference to the accompanying drawings in the embodiments of the present utility model. It should be noted that the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] The charging device of an electric vehicle mostly adopts a two-stage architecture. The first stage is a rectifying device that rectifies alternating current into direct current. The rectifying device usually uses efficient and reliable power electronics technology to achieve, thereby improving the efficiency and stability of the entire charging system. The second stage usually adopts a high-efficiency and wide-range isolated DC / DC converter. The main function of this stage is to isolate, regulate voltage, and filter the rectified direct current to meet the specific charging requirements of the electric vehicle battery pack. Through the isolation and voltage regulation functions, the DC / DC converter can ensure the safety and efficiency of the charging process. At the same time, the DC output voltage range of the charging device is usually relatively wide, covering a voltage range of 200V to 1000V, to adapt to the charging requirements of electric vehicle battery packs of different brands and models. However, due to the two-stage conversion architecture adopted by the charging device, there are certain energy losses in each stage, such as rectification loss, switching loss, conduction loss, etc. These losses will reduce the conversion efficiency of the entire charging system.

[0037] Embodiment 1

[0038] In view of the above deficiencies of the prior art, the embodiment of the present utility model provides a dual DC output charging device for an electric vehicle, which effectively solves the problem that the existing charging device has energy losses resulting in low conversion efficiency of the charging system. Figure 1 is the first schematic diagram of the structure of the dual DC output charging device for an electric vehicle provided by the embodiment of the present utility model. As Figure 1 shown, the dual DC output charging device 100 includes: a control module 160, an electromagnetic interference input module 110, an active power factor correction module 120, a DC / DC conversion module 130, a first output module 140, and a second output module 150, where:

[0039] The electromagnetic interference input module 110 is respectively connected to the active power factor correction module 120 and the control module 160. The electromagnetic interference input module 110 is used to suppress the electromagnetic interference of the charging device. In the embodiment of the present utility model, the electromagnetic interference input module 110 reduces the electromagnetic radiation generated by the charging device during operation and the sensitivity to external electromagnetic interference through measures such as filtering and shielding.

[0040] The active power factor correction module 120 is respectively connected to the DC / DC conversion module 130, the control module 160 and the first output module 140. The active power factor correction module 120 is used to convert alternating current into first direct current and transmit the first direct current to the DC / DC conversion module 130 and the first output module 140.

[0041] In the embodiment of the present utility model, the active power factor correction module 120 adopts a continuous current mode control type topology structure and / or a discontinuous current mode control type topology structure for the active power factor correction module 120. Figure 2 It is a schematic structural diagram of the active power factor correction module in the embodiment of the present utility model. As Figure 2 shown, the active power factor correction module 120 at least includes a rectification unit 121, a switching unit 122 and an output filtering unit 123, where: the rectification unit 121 is respectively connected to the electromagnetic interference input module 110 and the switching unit 122, and the rectification unit 121 is used to convert alternating current into high-voltage pulsating direct current; the switching unit 122 is connected to the rectification unit 121, and the switching unit 122 is used to convert the high-voltage pulsating direct current into stable direct current and control the waveform of the input current; the output filtering unit 123 is connected to the switching unit 122, and the output filtering unit 123 is used to filter the stable direct current and output the first direct current to the DC / DC conversion module 130 and the first output module 140.

[0042] The DC / DC conversion module 130 is respectively connected to the control module 160 and the second output module 150. The DC / DC conversion module 130 is used to adjust the voltage of the first direct current, output the second direct current and transmit the second direct current to the second output module 150.

[0043] In the embodiment of the present utility model, the DC / DC conversion module 130 adopts one of a buck DC / DC converter, a boost DC / DC converter and a buck-boost DC / DC converter. Figure 3 It is a schematic structural diagram of the DC / DC conversion module in the embodiment of the present utility model. As Figure 3As shown, the DC / DC conversion module 130 includes a power conversion unit 131 and an output unit 132. The power conversion unit 131 is connected to the active power factor correction module 120. The power conversion unit 131 is used to convert the voltage of the first direct current to output the second direct current. The output unit 132 is connected to the power conversion unit 131. The output unit 132 filters the second direct current and transmits it to the second output module 150.

[0044] The first output module 140 and the second output module 150 are connected to the control module 160. The first output module 140 and the second output module 150 are used to charge electric vehicle batteries with different output voltages. The control module 160 is used to formulate appropriate charging strategies, control the charging process, and provide functions such as safety protection by monitoring the states of other modules in real time. In the embodiment of the present invention, the control module 160 includes one or more of devices such as a digital signal processor, a single-chip microcomputer, and a microcontroller chip.

[0045] As a preferred embodiment of the present invention, Figure 4 is the second schematic diagram of the structure of the dual DC output charging device for an electric vehicle provided by the embodiment of the present invention. As Figure 4 shown, the dual DC output charging device 100 further includes an active power factor correction driving module 170 and a DC / DC conversion driving module 180. The active power factor correction driving module 170 is respectively connected to the control module 160 and the active power factor correction module 120. The active power factor correction driving module 170 is used to receive the first control signal sent by the control module 160, convert the first control signal into a switching element signal, such as a MOSFET switching tube and an IGBT switching tube, etc., and transmit the switching element signal to the active power factor correction module 120.

[0046] The DC / DC conversion driving module 180 is respectively connected to the control module 160 and the DC / DC conversion module 130. The DC / DC conversion driving module 180 is used to receive the second control signal sent by the control module 160, convert the second control signal into a voltage conversion signal, and transmit the voltage conversion signal to the DC / DC conversion module 130.

[0047] In the embodiment of the present utility model, if the AC input is 380V, the first direct current output can be adjusted by controlling the switching circuit of the active power factor correction module 120, and the voltage range of the first direct current is 600V to 900V. Therefore, the first electric vehicle battery 200 with a voltage not lower than 600V can be connected to the first output module 140, and the battery can be charged. At this time, only the first-stage active power factor correction module 120 is working, and only one-stage power conversion is passed from the AC input electromagnetic interference input module 110 to the first output module, which can effectively improve the charging efficiency. If the voltage of the second electric vehicle battery 300 is lower than 600V, it is connected to the second output module of the charging device, and the active power factor correction module 120 and the DC / DC conversion module 130 of the charging device work simultaneously. The first direct current is output as the second direct current through the voltage adjustment of the DC / DC conversion module 130, and the voltage range of the second direct current is 200V to 1000V. Specifically, the voltage of the battery of a heavy truck is usually above 600V and can be directly connected to the first output module 140 for charging. For the battery of a small car or other batteries with a voltage lower than 600V, the charging function can still be achieved by connecting to the second output module 150.

[0048] The charging device in the embodiment of the present utility model can set control strategies for two output modes: the first-stage output charging control mode and the second-stage DC output charging control mode. The first-stage DC output charging control mode is as follows: The control module 160 of the charging device realizes BMS communication with the first electric vehicle battery 200 of the first output module 140, obtains information such as the voltage, requested current, and voltage limit of the battery, and adjusts the output voltage of the first direct current by controlling the active power factor correction module 120, thereby realizing the control of the charging voltage and current of the battery.

[0049] The second-stage DC output charging control mode is as follows: The control module 160 of the charging device realizes BMS communication with the second electric vehicle battery 300 of the second output module 150, obtains information such as the voltage, requested current, and voltage limit of the battery, controls the bus voltage of the active power factor correction module 120 to be near a certain value, and controls the DC / DC conversion module 130 to adjust the output voltage of the second direct current, thereby realizing the control of the charging voltage and current of the battery. The selection of the bus voltage value of the active power factor correction module 120 can take the maximum charging system efficiency as the goal.

[0050] At the same time, the charging device can also work in the two-stage DC simultaneous output charging control mode, such as Figure 5As shown, the control module 160 of the charging device realizes BMS communication with the first electric vehicle battery 200 of the first output module 140, and at the same time, the control module 160 of the charging device realizes BMS communication with the second electric vehicle battery 300 of the second output module 150. First, information such as the voltage, requested current, and voltage limit of the first electric vehicle battery 200 is obtained, and the output voltage of the first direct current is adjusted by controlling the active power factor correction module 120, thereby realizing the control of the charging voltage and current of the first electric vehicle battery 200. Information such as the voltage, requested current, and voltage limit of the second electric vehicle battery 300 can also be obtained simultaneously, and the output voltage of the second direct current is adjusted by controlling the DC / DC conversion module 130, thereby realizing the control of the charging voltage and current of the second electric vehicle battery 300.

[0051] The dual direct current output charging device for electric vehicles provided by the embodiment of the present utility model constitutes two direct current output terminals by leading out a direct current output port outside the active power factor correction module and retaining the output direct current interface of the second stage at the same time. The two output terminals can be independently controlled, and the output voltage and current are adjusted according to actual needs to achieve more refined energy management, so that the charging device can adapt to different charging scenarios and requirements.

[0052] Embodiment 2

[0053] Based on the same technical concept, the embodiment of the present utility model provides a charging device. Figure 5 It is a schematic structural diagram of the charging device provided by the embodiment of the present utility model. As Figure 5 shown, the charging device 400 includes the dual direct current output charging device 100 in Embodiment 1 above.

[0054] The charging device provided by the embodiment of the present utility model has two direct current output terminals, which can be independently controlled, and the output voltage and current are adjusted according to actual needs to achieve more refined energy management, so that the charging device can adapt to different charging scenarios and requirements. At the same time, the two output terminals can support intelligent charging technologies, such as automatically adjusting the charging current and voltage, optimizing the charging strategy according to the battery state, etc., which helps to optimize the charging process, improve the charging efficiency and battery life.

[0055] Embodiment 3

[0056] Based on the same technical concept, the embodiment of the present utility model provides a charging system. Figure 6 It is a schematic structural diagram of the charging system provided by the embodiment of the present utility model. As Figure 6 shown, the charging system 500 includes a power supply device 600 and multiple charging devices 400 as described in Embodiment 2 above.

[0057] The charging system provided by the embodiment of the present utility model is designed to support multiple load types, which increases the compatibility and scalability of the system. At the same time, through power factor correction technology, the power factor of the charging device is improved, harmonic pollution is reduced, and thus the energy utilization efficiency of the charging system is enhanced.

[0058] In summary, for the dual DC output charging device, equipment and system of an electric vehicle provided by the present utility model, a DC output port is led out externally from the active power factor correction module, and at the same time, the output DC interface of the second stage is retained to form two DC output terminals. The two output terminals can be independently controlled, and the output voltage and current can be adjusted according to actual requirements to achieve more refined energy management, enabling the charging device to adapt to different charging scenarios and requirements, and increasing the compatibility and scalability of the system. At the same time, through power factor correction technology, the power factor of the charging device is improved, harmonic pollution is reduced, and thus the energy utilization efficiency of the charging system is enhanced.

[0059] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0060] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model 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 described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A dual DC output charging device for an electric vehicle, characterized in that: The dual DC output charging device includes a control module, an electromagnetic interference input module, an active power factor correction module, a DC / DC conversion module, a first output module and a second output module, wherein: The electromagnetic interference input module is connected to the active power factor correction module and the control module respectively, and the electromagnetic interference input module is used to suppress the electromagnetic interference of the charging device; The active power factor correction module is connected to the DC / DC conversion module, the control module and the first output module respectively, and the active power factor correction module is used to convert the alternating current into the first direct current, and transmit the first direct current to the DC / DC conversion module and the first output module; The DC / DC conversion module is connected to the control module and the second output module respectively, and the DC / DC conversion module is used to regulate the voltage of the first direct current, output the second direct current, and transmit the second direct current to the second output module; The first output module and the second output module are connected to the control module, and the first output module and the second output module are used to charge electric vehicle batteries with different output voltages.

2. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The charging device also includes an active power factor correction drive module, which is respectively connected to the control module and the active power factor correction module. The active power factor correction drive module is used to receive a first control signal sent by the control module, convert the first control signal into a switching element signal, and transmit the switching element signal to the active power factor correction module.

3. The dual DC output charging device for electric vehicles according to claim 2, characterized in that: The charging device also includes a DC / DC conversion drive module, which is respectively connected to the control module and the DC / DC conversion module, and is used to receive a second control signal sent by the control module, convert the second control signal into a voltage conversion signal, and transmit the voltage conversion signal to the DC / DC conversion module.

4. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The active power factor correction module includes a rectifier unit, a switch unit and an output filter unit, wherein: The rectifier unit is connected to the electromagnetic interference input module and the switch unit respectively, and the rectifier unit is used to convert the alternating current into high-voltage pulsating direct current; The switch unit is connected to the rectifier unit, and is used to convert the high-voltage pulsating direct current into a stable direct current and control the waveform of the input current; The output filter unit is connected to the switch unit, and is used for filtering the stable direct current and outputting the first direct current to the DC / DC conversion module and the first output module.

5. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The DC / DC conversion module includes a power conversion unit and an output unit, wherein: The power conversion unit is connected to the active power factor correction module, and the power conversion unit is used to perform voltage conversion on the first direct current and output the second direct current; The output unit is connected to the power conversion unit, and the output unit filters the second direct current and transmits it to the second output module.

6. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The active power factor correction module is a continuous current mode control type topology structure and / or a discontinuous current mode control type topology structure.

7. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The DC / DC conversion module is one of a buck DC / DC converter, a boost DC / DC converter and a buck-boost DC / DC converter.

8. The dual DC output charging device for electric vehicles according to claim 1, characterized in that: The control module is one or more of a digital signal processor, a single chip microcomputer and a microcontroller chip.

9. A charging device, characterized in that: The charging equipment includes a dual DC output charging device for an electric vehicle as described in any one of claims 1-8.

10. A charging system, characterized in that: The charging system comprises a power supply device and a plurality of charging devices as claimed in claim 9.

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