OBC and DC / DC integrated charger, control method and related equipment

Abstract

An embodiment of the present application provides an OBC and DC / DC integrated charger, a control method, and related equipment. The OBC and DC / DC integrated charger includes an OBC, an OBC controller, an on-board controller, and a DC / DC converter. The first output of the DC / DC converter is connected to the input of the on-board controller, the second output of the DC / DC converter is connected to the low-voltage output, the first output of the on-board controller is connected to the first input of the OBC controller, the second output of the on-board controller is connected to the second input of the OBC controller, the third output of the on-board controller is connected to the first input of the DC / DC converter, and the output of the OBC controller is connected to the first input of the OBC. The present application can timely adjust the resonant cavity current of the OBC when the load of the electrical device at the DC / DC output suddenly increases, thereby preventing the OBC input current from exceeding the limit of the charging gun and causing an overcurrent fault.

Description

Technical Field

[0001] The present application belongs to the field of on-board chargers, and specifically relates to an OBC and DC / DC integrated charger, a control method and related equipment. Background Art

[0002] In OBC and DC / DC integrated charger applications, the total output power of the high-voltage electrical equipment and direct current / direct current (DC / DC) converter connected to the output of the on-board charger (OBC) cannot exceed the total input power of the OBC. If their total output power exceeds the total input power of the OBC, the OBC input current will exceed the limit of the charging gun, resulting in an overcurrent fault. When the on-board controller and the OBC controller use serial communication to transmit the OBC's resonant cavity current value, due to data transmission delays, when the load connected to the output of the DC / DC converter suddenly increases, the OBC controller cannot adjust the OBC output power in time. At this time, the sum of the output power of the high-voltage electrical equipment and the DC / DC converter connected to the OBC output will exceed the total input power of the OBC, causing the OBC input current to exceed the limit of the charging gun and an overcurrent fault. Therefore, current regulation during the charging process of the OBC and DC / DC integrated charger is a technical problem that needs to be solved urgently. Summary of the Invention

[0003] The embodiments of the present application provide an OBC and DC / DC integrated charger, a control method, and related equipment. By providing a new OBC and DC / DC integrated charger and control method, it is possible to promptly adjust the output current when the load of the electrical equipment at the DC / DC output end suddenly increases, thereby preventing the OBC input current from exceeding the charging gun limit and causing an overcurrent fault.

[0004] In a first aspect, an embodiment of the present application provides an OBC and DC / DC integrated charger, including an on-board charger (OBC), an OBC controller, an on-board controller, and a direct current / direct current (DC / DC) converter;

[0005] Wherein, the first output end of the DC / DC converter is connected to the input end of the vehicle controller, the second output end of the DC / DC converter is connected to the low-voltage output end, the first output end of the vehicle controller is connected to the first input end of the OBC controller, the second output end of the vehicle controller is connected to the second input end of the OBC controller, the third output end of the vehicle controller is connected to the first input end of the DC / DC converter, the output end of the OBC controller is connected to the first input end of the OBC, the second input end of the OBC is connected to an external power supply, the first output end of the OBC is connected to the high-voltage electrical equipment, the second input end of the DC / DC converter and the third input end of the OBC controller, and the second output end of the OBC is connected to the fourth input end of the OBC controller;

[0006] Among them, the on-board controller is used to collect the output current of the DC / DC converter when the load at the low-voltage output end suddenly increases, convert the output current of the DC / DC converter into a first pulse width modulation (PWM) signal, and transmit it to the OBC controller through the second output end, and also generate a first reference current and output it to the OBC controller through the first output end; the OBC controller is used to obtain a second PWM signal based on the first reference current, the first PWM signal, the OBC resonant cavity current output from the second output end of the OBC and the input current of the high-voltage electrical equipment, and output the second PWM signal to the OBC; the OBC is used to adjust the resonant cavity current according to the second PWM signal, and output the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output end. The current output from the first output end of the OBC is the current obtained after rectification and filtering of the OBC resonant cavity current; the DC / DC converter is used to convert the current input to the OBC and output it to the low-voltage output end.

[0007] In the second aspect, an embodiment of the present application provides a control method for an OBC and DC / DC integrated charger, including: the method is applied to an OBC and DC / DC integrated charger, the OBC and DC / DC integrated charger includes an OBC, an OBC controller, an on-board controller, and a DC / DC converter, the method includes: when the load at the low-voltage output end suddenly increases, the on-board controller collects the output current of the DC / DC converter, converts the output current of the DC / DC converter into a first PWM signal, and transmits it to the OBC controller through the second output end, and also generates a first reference current and outputs it to the OBC controller through the first output end, wherein the greater the output current of the DC / DC converter, the greater the , the larger the duty cycle of the first PWM signal; the OBC controller obtains a second PWM signal according to the first reference current, the first PWM signal, the OBC resonant cavity current output from the second output end of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC; the OBC adjusts the resonant cavity current according to the second PWM signal, and outputs the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output end. The current output from the first output end of the OBC is the current obtained after rectification and filtering of the OBC resonant cavity current; the DC / DC converter converts the current input to the OBC and outputs it to the low-voltage output end.

[0008] In a third aspect, an embodiment of the present application provides an OBC and DC / DC integrated charging system, which includes an OBC and DC / DC integrated charger, an external power supply, high-voltage electrical equipment and a low-voltage output end, wherein the OBC and DC / DC integrated charger is such as the OBC and DC / DC integrated charger described in any method of the first aspect or the second aspect of the embodiment of the present application.

[0009] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which program data is stored. When the program data is executed by a processor, the program data is used to execute the program data to implement some or all of the steps of the second aspect of the embodiment of the present application.

[0010] It can be seen that in the embodiment of the present application, when the load at the low-voltage output end suddenly increases, the on-board controller collects the output current of the DC / DC converter, converts the output current of the DC / DC converter into a first PWM signal, and transmits it to the OBC controller through the second output end. It also generates a first reference current and outputs it to the OBC controller through the first output end, wherein the greater the output current of the DC / DC converter, the greater the duty cycle of the first PWM signal; the OBC controller obtains a second PWM signal based on the first reference current, the first PWM signal, the resonant cavity current of the OBC outputted from the second output end of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC; the OBC adjusts the resonant cavity current inputted by the external power supply according to the second PWM signal, and outputs the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output end, and the current outputted from the first output end of the OBC is the current obtained after rectification and filtering of the resonant cavity current of the OBC; the DC / DC converter converts the current inputted by the OBC and outputs it to the low-voltage output end. Using the above method, since the transmission speed of PWM signals is much faster than serial communication, and the on-board charger controls the OBC controller and the OBC controller controls the OBC by sending a PWM signal, when the load of the low-voltage output end connected to the output end of the DC / DC converter suddenly increases, the OBC can adjust the OBC resonant cavity current in time to avoid the OBC input current exceeding the charging gun limit and causing an overcurrent fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0012] Figure 1 A schematic diagram of the structure of an OBC and DC / DC integrated charging system provided in an embodiment of the present application;

[0013] Figure 2 A schematic diagram of the structure of an OBC and DC / DC integrated charger provided in an embodiment of the present application;

[0014] Figure 3 A schematic diagram of the structure of an OBC controller provided in an embodiment of the present application;

[0015] Figure 4 A flow chart of a control method for an OBC and DC / DC integrated charger provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] The terms "first," "second," and so on, in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps is not limited to the listed steps but may optionally include steps not listed, or may optionally include other steps inherent to the process, method, product, or apparatus.

[0018] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] First, see Figure 1 , Figure 1 A schematic diagram of the structure of an OBC and DC / DC integrated charging system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the system includes an external power supply, an OBC and a DC / DC integrated charger, high-voltage electrical equipment, and a low-voltage output end; wherein, the external power supply refers to an external device that provides input power to the OBC and the DC / DC integrated charger, which can be a charging pile or other convenient charging device, the high-voltage electrical equipment refers to some high-power loads inside the car, and the low-voltage output end is connected to some low-power loads inside the car. The OBC and the DC / DC integrated charger are key components for power transmission and conversion in electric vehicles. The power input by the external power supply is transmitted and converted through the OBC and the DC / DC integrated charger, and the high-voltage DC power is output to charge the high-voltage electrical equipment, and the low-voltage DC power is output to provide power or charge the low-voltage electrical equipment.

[0020] Below through Figure 2 Specific description of OBC and DC / DC integrated charger:

[0021] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of an OBC and DC / DC integrated charger provided in an embodiment of the present application, as shown in FIG. Figure 2 As shown, the OBC and DC / DC integrated charger includes an OBC controller 210 , an OBC 220 , an onboard controller 230 , and a DC / DC converter 240 .

[0022] In a feasible embodiment, a first output end of the DC / DC converter 240 is connected to an input end of the onboard controller 230, a second output end of the DC / DC converter 240 is connected to a low-voltage output end, a first output end of the onboard controller 230 is connected to a first input end of the OBC controller 210, a second output end of the onboard controller 230 is connected to a second input end of the OBC controller 210, a third output end of the onboard controller 230 is connected to a first input end of the DC / DC converter 240, an output end of the OBC controller 210 is connected to a first input end of the OBC 220, a second input end of the OBC 220 is connected to an external power supply, a first output end of the OBC 220 is connected to a high-voltage electrical device, a second input end of the DC / DC converter 240, and a third input end of the OBC controller 210, and a second output end of the OBC 220 is connected to a fourth input end of the OBC controller 210;

[0023] The onboard controller 230 is configured to collect the output current of the DC / DC converter 240 when the load at the low-voltage output end suddenly increases, convert the output current of the DC / DC converter 240 into a first PWM signal, and transmit the signal to the OBC controller 210 through the second output end. The onboard controller 230 also generates a first reference current and outputs the signal to the OBC controller 210 through the first output end. The OBC controller 210 is configured to obtain a second PWM signal based on the first reference current, the first PWM signal, the resonant cavity current of the OBC 220 outputted from the second output end of the OBC 220, and the input current of the high-voltage electrical equipment, and output the second PWM signal to the OBC 220. The OBC 220 is configured to regulate the resonant cavity current according to the second PWM signal and output the regulated current to the high-voltage electrical equipment and the DC / DC converter 240 through the first output end. The current outputted from the first output end of the OBC 220 is the current obtained after rectification and filtering of the resonant cavity current of the OBC 220. The DC / DC converter 240 is configured to convert the current inputted by the OBC 220 and output the converted current to the low-voltage output end.

[0024] Among them, the DC / DC converter 240 is used to step down the direct current to meet the needs of some low-voltage electrical equipment inside the car. The on-board controller 230 is responsible for communicating and interacting with the entire vehicle and directly controlling the output power of the DC / DC converter 240, and transmitting the output power of OBC220 to the OBC controller 210 according to the needs of the entire vehicle. The OBC controller 210 sends control instructions to OBC220 based on the received output power of OBC220. OBC220 is a charger fixedly installed on the electric vehicle, which has the ability to automatically fully charge the power battery of the electric vehicle. It can dynamically adjust the charging power according to the control instructions sent by the OBC controller 210.

[0025] In an embodiment of the present application, when the load at the low-voltage output end suddenly increases, the on-board controller 230 converts the current of the DC / DC converter 240 into a first PWM signal and sends it to the OBC controller 210. The OBC controller 210 generates a second PWM signal based on the first PWM signal and other currents, and outputs the second PWM signal to OBC220. OBC220 adjusts the output current according to the second PWM signal. Since the transmission speed of the PWM signal is much faster than serial communication, when the load at the low-voltage output end connected to the DC / DC output end suddenly increases, OBC220 can adjust the resonant cavity current of OBC220 in time, thereby avoiding the input current of OBC220 exceeding the charging gun limit and causing an overcurrent fault.

[0026] Below through Figure 3 The OBC controller 210 is described in detail:

[0027] See also Figure 3 , Figure 3 A schematic diagram of the structure of an OBC controller provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the OBC controller includes a first adder 212 , a second adder 213 , a third adder 216 , a first sampling circuit 217 , a second sampling circuit 214 , a first proportional integral (PI) regulator 215 , a second PI regulator 218 , a PWM capture circuit 211 and a PWM generation circuit 219 .

[0028] In a feasible embodiment, the first input terminal and the second input terminal of the first adder 212 are respectively connected to the first output terminal of the vehicle controller 230 and the output terminal of the PWM capture circuit 211, the input terminal of the PWM capture circuit 211 is connected to the second output terminal of the vehicle controller 230, the first input terminal of the second adder 213 is connected to the output terminal of the first adder 212, the second input terminal of the second adder 213 is connected to the output terminal of the second sampling circuit 214, the output terminal of the first adder 212 is connected to the third input terminal of the third adder 216, and the output terminal of the second adder 213 is connected to the first PI modulator. regulator 215, a first input end of the third adder 216 is connected to the output end of the first PI regulator 215, a second input end of the third adder 216 is connected to the output end of the first sampling circuit 217, the first sampling circuit 217 is connected to the second output end of the OBC 220, the second sampling circuit 214 is connected to the first output end of the OBC 220, the output end of the third adder 216 is connected to the input end of the second PI regulator 218, the output end of the second PI regulator 218 is connected to the input end of the PWM generation circuit 219, and the output end of the PWM generation circuit 219 is connected to the first input end of the OBC 220;

[0029] The PWM capture circuit 211 is configured to capture the first PWM signal outputted by the vehicle controller 230 through the second output terminal, and convert the first PWM signal into a first input current which is inputted into the first adder 212 through the second input terminal of the first adder 212;

[0030] A first adder 212 is configured to calculate a second reference current based on the first reference current and the first input current, and output the second reference current to a second adder 213. The first reference current refers to a reference value or a target value of the resonant cavity current of the OBC 220.

[0031] The second sampling circuit 214 is used to collect the input current of the high-voltage electrical equipment and output the input current of the high-voltage electrical equipment to the second adder 213;

[0032] A first sampling circuit 217 is used to collect the resonant cavity current of the OBC 220 and output the resonant cavity current of the OBC 220 to the third adder 216;

[0033] The second adder 213 is configured to calculate the second reference current and the input current of the high-voltage electrical equipment to obtain a third reference current, and output the third reference current to the first PI regulator 215;

[0034] a first PI regulator 215 for linearly combining the proportion and integral of the third reference current to determine a first control current, and outputting the first control current to a third adder 216;

[0035] The third adder 216 is configured to calculate the first control current, the resonant cavity current of the OBC 220 and the second reference current to obtain a fourth reference current, and output the fourth reference current to the second PI regulator 218;

[0036] a second PI regulator 218 for linearly combining the proportion and integral of the fourth reference current to determine a first modulation wave, and outputting the first modulation wave to the PWM generation circuit 219;

[0037] The PWM generating circuit 219 is used to perform pulse modulation on the first modulation wave to obtain a second PWM signal, and output the second PWM signal to the OBC 220 .

[0038] In a feasible embodiment, the first adder 212 is further configured to output a feedback to the third adder 216 so as to enable the second PI regulator 218 to quickly respond to the change of the input current to speed up the overall regulation speed.

[0039] In a feasible embodiment, OBC220 includes a power factor corrector (PFC) 221, a resonant circuit LLC222 and a rectifier and filter module 223, wherein the output end of PFC221 is connected to the input end of LLC222, the output end of LLC222 is connected to the input end of the rectifier and filter module 223, and the current output by the output end of LLC222 is the resonant cavity current of OBC220.

[0040] It can be understood that PFC221 is used to improve the power factor of electrical equipment, LLC222 is used as an absorption circuit to filter out interference signals, etc., the rectifier and filter module 223 is used to rectify and filter the current, the first input end of OBC220 can be understood as the input end of LLC222, the second input end of OBC220 can be understood as the input end of PFC221, and the output end of LLC222 can be understood as connected to the first sampling circuit 217. The first sampling circuit 217 collects the current at the output end of LLC222, that is, the resonant cavity current of OBC220.

[0041] In the embodiment of the present application, the OBC controller 210 includes a first adder 212, a second adder 213, a third adder 216, a first sampling circuit 217, a second sampling circuit 214, a first PI regulator 215, a second PI regulator 218, a PWM capture circuit 211 and a PWM generation circuit 219, and obtains a second PWM signal through the first reference current, the first input current, the input current of the high-voltage electrical equipment and the resonant cavity current of the OBC, thereby regulating the current of OBC220. When the load at the low-voltage output end suddenly increases, OBC220 can be controlled in a timely and accurate manner to avoid the input current of OBC220 exceeding the limit of the charging gun and causing an overcurrent fault.

[0042] See also Figure 4 , Figure 4 This is a flow chart of a control method for an OBC and DC / DC integrated charger provided in an embodiment of the present application. The method is applied to an OBC and DC / DC integrated charger. The OBC and DC / DC integrated charger includes an OBC, an OBC controller, an on-board controller, and a DC / DC converter. The method includes:

[0043] Step S41: When the load at the low-voltage output end suddenly increases, the on-board controller collects the output current of the DC / DC converter, converts the output current of the DC / DC converter into a first PWM signal, and transmits it to the OBC controller through the second output end. The on-board controller also generates a first reference current and outputs it to the OBC controller through the first output end. The greater the output current of the DC / DC converter, the greater the duty cycle of the first PWM signal.

[0044] Compared to serial communication, PWM signal transmission enables faster transmission speeds, allowing the OBC controller to more quickly react to changes in the DC / DC converter's output current. The onboard charger, used to communicate with the vehicle, can also generate a reference current based on the vehicle's needs. This reference current serves as the reference value for the OBC's resonant cavity current and is transmitted to the OBC controller, which then uses this reference current to control the OBC's resonant cavity current.

[0045] Step S42: The OBC controller obtains a second PWM signal according to the first reference current, the first PWM signal, the OBC resonant cavity current output from the second output terminal of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC.

[0046] The preset condition is that the first reference current value is equal to the resonant cavity current value of the OBC.

[0047] In a feasible embodiment, the OBC controller includes a first adder, a second adder, a third adder, a first sampling circuit, a second sampling circuit, a first PI regulator, a second PI regulator, a PWM capture circuit, and a PWM generation circuit. When the load at the low-voltage output end suddenly increases, the OBC controller obtains a second PWM signal based on the first reference current, the first PWM signal, the resonant cavity current of the OBC outputted from the second output end of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC, including:

[0048] The PWM capture circuit converts the first PWM signal into a first input current and outputs the first input current to the first adder; the first adder calculates a second reference current based on the first reference current and the first input current, and outputs the second reference current to the second adder; the second sampling circuit collects the input current of the high-voltage electrical equipment and outputs the input current of the high-voltage electrical equipment to the second adder; the first sampling circuit collects the resonant cavity current of the OBC and outputs the resonant cavity current of the OBC to the third adder; the second adder calculates a third reference current based on the second reference current and the input current of the high-voltage electrical equipment, and outputs the third reference current to the first PI regulator; the first PI regulator obtains a first control current based on the third reference current and outputs the first control current to the third adder; the third adder calculates a fourth reference current based on the first control current, the resonant cavity current of the OBC and the second reference current, and outputs the fourth reference current to the second PI regulator; the second PI regulator obtains a first modulation wave based on the fourth reference current, and outputs the first modulation wave to the PWM generation circuit; the PWM generation circuit obtains a second PWM signal based on the first modulation wave, and outputs the second PWM signal to the OBC.

[0049] Among them, when the load at the low-voltage output end suddenly increases, the output current of the DC / DC converter increases, the second reference current output by the first adder decreases, the third reference current output by the second adder decreases, the first control current output by the first PI regulator decreases, and the current value output by the third adder decreases. Finally, the second PWM signal output by the OBC controller adjusts the resonant cavity current of the OBC, so that the resonant cavity current of the OBC decreases; as the resonant cavity current of the OBC decreases, the input current of the high-voltage electrical equipment will also decrease. At this time, the output value of the second adder increases, the first control current output by the first PI regulator increases, and the current value output by the third adder increases. Finally, the second PWM signal output by the OBC controller adjusts the resonant cavity current of the OBC, so that the resonant cavity current of the OBC increases, and continues until the resonant cavity current of the OBC is equal to the reference value of the resonant cavity current of the OBC, that is, the first reference current value.

[0050] In an embodiment of the present application, when the load at the low-voltage output suddenly increases, the OBC controller controls the OBC's resonant cavity current based on the increase in the DC / DC converter's output current and the decrease in the high-voltage electrical equipment's input current until the OBC's resonant cavity current equals a reference value for the OBC's resonant cavity current. This automatically controls the OBC's resonant cavity current, preventing the sum of the output power of the high-voltage electrical equipment and the DC / DC converter at the OBC's output from exceeding the OBC's total input power.

[0051] Step S43: The OBC adjusts the resonant cavity current according to the second PWM signal, and outputs the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output terminal. The current output from the first output terminal of the OBC is the current obtained after the resonant cavity current of the OBC is rectified and filtered.

[0052] Among them, because the OBC can dynamically adjust the charging current parameters according to the control instruction, the OBC can adjust its charging current parameters through the second PWM signal and thus adjust the resonant cavity current of the OBC.

[0053] Step S44: The DC / DC converter converts the current input by the OBC and outputs it to the low-voltage output terminal.

[0054] Among them, the on-board controller is responsible for communicating and interacting with the entire vehicle and directly controlling the output current of the DC / DC. The on-board controller will output a controller signal to control the DC / DC converter to convert the current output by the OBC to the DC / DC converter and output it to the low-voltage output end.

[0055] In a feasible embodiment, the first adder further outputs a feedback to the third adder to enable the second PI regulator to respond to the change of the input current in advance, thereby accelerating the overall regulation speed.

[0056] It can be seen that in the embodiment of the present application, when the load at the low-voltage output end suddenly increases, the on-board controller collects the output current of the DC / DC converter, converts the output current of the DC / DC converter into a first PWM signal, and transmits it to the OBC controller through the second output end. It also generates a first reference current and outputs it to the OBC controller through the first output end, wherein the greater the output current of the DC / DC converter, the greater the duty cycle of the first PWM signal; the OBC controller obtains a second PWM signal based on the first reference current, the first PWM signal, the resonant cavity current of the OBC outputted from the second output end of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC; the OBC adjusts the current inputted from the external power supply according to the second PWM signal, and outputs the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output end, and the current outputted from the first output end of the OBC is the current obtained after rectification and filtering of the resonant cavity current of the OBC; the DC / DC converter converts the current inputted by the OBC and outputs it to the low-voltage output end. Using the above method, since the transmission speed of PWM signals is much faster than serial communication, and the on-board charger controls the OBC controller and the OBC controller controls the OBC by sending a PWM signal, when the load of the electrical equipment connected to the DC / DC output end suddenly increases, the OBC can adjust the OBC resonant cavity current in time to avoid the OBC input current exceeding the charging gun limit and causing overcurrent.

[0057] An embodiment of the present application provides a computer-readable storage medium, wherein program data is stored in the computer-readable storage medium. When the program data is executed by a processor, the program data is used to perform some or all steps of any one of the control methods for an OBC and DC / DC integrated charger described in the above method embodiments.

[0058] It should be noted that for the aforementioned embodiments of any of the OBC and DC / DC integrated chargers, control methods, and related devices, for simplicity of description, they are all expressed as a series of action combinations. However, those skilled in the art should be aware that this application is not limited to the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions involved are not necessarily required by this application.

[0059] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality of components or steps. The fact that certain measures are recited in different dependent claims does not mean that these measures cannot be combined to produce good results.

[0060] Those skilled in the art will appreciate that all or part of the steps in any of the above-mentioned embodiments of the control method for an OBC and a DC / DC integrated charger may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable memory, which may include a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0061] The embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of an OBC and DC / DC integrated charger, control method, and related equipment of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, based on the idea of a data acquisition method and device of the present application, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present application.

[0062] The present application is described with reference to the flowcharts and / or block diagrams of the methods, hardware products, and computer program products of the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0063] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0065] It can be understood that any product that is controlled or configured to execute the processing method of the flowchart described in the embodiment of the control method of an OBC and DC / DC integrated charger in this application, such as the terminal and computer program product in the above flowchart, falls within the scope of the related products described in this application.

[0066] Obviously, those skilled in the art may make various modifications and variations to the OBC and DC / DC integrated charger, control method, and related devices provided herein without departing from the spirit and scope of this application. Thus, if such modifications and variations fall within the scope of the claims and their equivalents, this application is intended to encompass such modifications and variations.

Claims

1. An OBC and DC / DC integrated charger, characterized in that: Including OBC, OBC controller, vehicle controller, DC / DC converter; Wherein, the first output end of the DC / DC converter is connected to the input end of the vehicle-mounted controller, the second output end of the DC / DC converter is connected to the low-voltage output end, the first output end of the vehicle-mounted controller is connected to the first input end of the OBC controller, the second output end of the vehicle-mounted controller is connected to the second input end of the OBC controller, the third output end of the vehicle-mounted controller is connected to the first input end of the DC / DC converter, the output end of the OBC controller is connected to the first input end of the OBC, the second input end of the OBC is connected to an external power supply, the first output end of the OBC is connected to a high-voltage electrical device, the second input end of the DC / DC converter and the third input end of the OBC controller, and the second output end of the OBC is connected to the fourth input end of the OBC controller; The on-board controller is configured to collect the output current of the DC / DC converter when the load on the low-voltage output terminal suddenly increases, convert the output current of the DC / DC converter into a first PWM signal, and transmit the first PWM signal to the OBC controller through the second output terminal; and generate a first reference current and output the first reference current to the OBC controller through the first output terminal; The OBC controller is configured to obtain a second PWM signal based on the first reference current, the first PWM signal, the OBC resonant cavity current output from the second output terminal of the OBC, and the input current of the high-voltage electrical equipment, and output the second PWM signal to the OBC; The OBC is configured to adjust the resonant cavity current of the OBC according to the second PWM signal, and output the adjusted current to the high-voltage electrical equipment and the DC / DC converter through a first output terminal, wherein the current output from the first output terminal of the OBC is the current obtained after rectification and filtering of the resonant cavity current of the OBC; The DC / DC converter is used to convert the current output by the OBC and output it to the low-voltage output end.

2. The OBC and DC / DC integrated charger according to claim 1, characterized in that: The OBC controller includes a first adder, a second adder, a third adder, a first sampling circuit, a second sampling circuit, a first PI regulator, a second PI regulator, a PWM capture circuit and a PWM generation circuit; The first input and second input of the first adder are respectively connected to the first output of the on-board controller and the output of the PWM capture circuit, the input of the PWM capture circuit is connected to the second output of the on-board controller, the first input of the second adder is connected to the output of the first adder, the second input of the second adder is connected to the output of the second sampling circuit, the output of the first adder is connected to the third input of the third adder, the output of the second adder is connected to the first PI regulator, the first input of the third adder is connected to the output of the first PI regulator, the second input of the third adder is connected to the output of the first sampling circuit, the first sampling circuit is connected to the second output of the OBC, the second sampling circuit is connected to the first output of the OBC, the output of the third adder is connected to the input of the second PI regulator, the output of the second PI regulator is connected to the input of the PWM generation circuit, and the output of the PWM generation circuit is connected to the first input of the OBC; The PWM capture circuit is configured to convert the first PWM signal into a first input current and output the first input current to a first adder; The first adder is configured to calculate a second reference current according to the first reference current and the first input current, and output the second reference current to the second adder; The second sampling circuit is used to collect the input current of the high-voltage electrical equipment and output the input current of the high-voltage electrical equipment to the second adder; The first sampling circuit is used to collect the resonant cavity current of the OBC and output the resonant cavity current of the OBC to the third adder; The second adder is configured to calculate a third reference current based on the second reference current and the input current of the high-voltage electrical equipment, and output the third reference current to the first PI regulator; The first PI regulator is configured to obtain a first control current according to the third reference current, and output the first control current to the third adder; The third adder is configured to calculate a fourth reference current according to the first control current, the resonant cavity current of the OBC and the second reference current, and output the fourth reference current to the second PI regulator; The second PI regulator is configured to obtain a first modulation wave according to the fourth reference current and output the first modulation wave to the PWM generation circuit; The PWM generating circuit is used to obtain the second PWM signal according to the first modulation wave, and output the second PWM signal to the OBC.

3. The OBC and DC / DC integrated charger according to claim 2, characterized in that: The first adder is further configured to output a feedback to the third adder so that the second PI regulator can quickly respond to changes in the input current.

4. The OBC and DC / DC integrated charger according to any one of claims 1 to 3, characterized in that: The OBC includes a PFC, an LLC and a rectifier and filter module, wherein the output end of the PFC is connected to the input end of the LLC, the output end of the LLC is connected to the input end of the rectifier and filter module, and the current output by the output end of the LLC is the resonant cavity current of the OBC.

5. A control method for an OBC and DC / DC integrated charger, characterized in that: The method is applied to an OBC and DC / DC integrated charger, which includes an OBC, an OBC controller, an onboard controller, and a DC / DC converter. The method includes: When the load at the low-voltage output end suddenly increases, the on-board controller collects the output current of the DC / DC converter, converts the output current of the DC / DC converter into a first PWM signal, and transmits the first PWM signal to the OBC controller through the second output end. The on-board controller also generates a first reference current and outputs the first reference current to the OBC controller through the first output end. The greater the output current of the DC / DC converter, the greater the duty cycle of the first PWM signal. The OBC controller obtains a second PWM signal according to the first reference current, the first PWM signal, the OBC resonant cavity current output from the second output terminal of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC; The OBC adjusts the resonant cavity current of the OBC according to the second PWM signal, and outputs the adjusted current to the high-voltage electrical equipment and the DC / DC converter through the first output terminal. The current output from the first output terminal of the OBC is the current obtained after the resonant cavity current of the OBC is rectified and filtered. The DC / DC converter converts the current input by the OBC and outputs the converted current to the low-voltage output terminal.

6. The method according to claim 5, wherein The OBC controller includes a first adder, a second adder, a third adder, a first sampling circuit, a second sampling circuit, a first PI regulator, a second PI regulator, a PWM capture circuit, and a PWM generation circuit. The OBC controller obtains a second PWM signal according to the first reference current, the first PWM signal, the resonant cavity current of the OBC outputted from the second output terminal of the OBC, and the input current of the high-voltage electrical equipment until a preset condition is met, and outputs the second PWM signal to the OBC, including: The PWM capture circuit converts the first PWM signal into a first input current, and outputs the first input current to a first adder; The first adder calculates a second reference current according to the first reference current and the first input current, and outputs the second reference current to the second adder; The second sampling circuit collects the input current of the high-voltage electrical equipment and outputs the input current of the high-voltage electrical equipment to the second adder; The first sampling circuit collects the resonant cavity current of the OBC and outputs the resonant cavity current of the OBC to the third adder; The second adder calculates a third reference current based on the second reference current and the input current of the high-voltage electrical equipment, and outputs the third reference current to the first PI regulator; The first PI regulator obtains a first control current according to the third reference current, and outputs the first control current to the third adder; The third adder calculates a fourth reference current according to the first control current, the resonant cavity current of the OBC and the second reference current, and outputs the fourth reference current to the second PI regulator; The second PI regulator obtains a first modulation wave according to the fourth reference current, and outputs the first modulation wave to the PWM generation circuit; The PWM generating circuit obtains the second PWM signal according to the first modulation wave, and outputs the second PWM signal to the OBC.

7. The method according to claim 5, wherein The preset condition is that the first reference current value is equal to the resonant cavity current value of the OBC.

8. The method according to claim 6, wherein The method further includes: the first adder further outputting a feedback to the third adder to enable the second PI regulator to quickly respond to changes in the input current.

9. An OBC and DC / DC integrated charging system, characterized in that: The device comprises the OBC and DC / DC integrated charger according to any one of claims 1 to 3, an external power supply, high-voltage electrical equipment and a low-voltage output terminal.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores program data, and when the program data is executed by a processor, the program data is used to execute the program data to implement the method according to any one of claims 5 to 8.

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