A charging circuit, control method, vehicle-mounted integrated power supply and vehicle

Abstract

The application discloses a charging circuit, a control method, a vehicle-mounted integrated power supply and a vehicle, relates to the technical field of new energy automobile power supplies, and aims to improve charging efficiency.The charging circuit comprises a boost circuit, a direct connection circuit and a controller.The input end of the boost circuit is connected with a charging pile, the output end of the boost circuit is connected with a battery, the input end of the direct connection circuit is connected with the charging pile, and the output end of the direct connection circuit is connected with the battery.The controller is connected with the battery, the controller is connected with the boost circuit, the controller is connected with the direct connection circuit, and the controller is further connected with the charging pile.When the boost circuit is turned on and the charging pile meets the condition of switching direct connection charging, the controller controls the direct connection circuit to be turned on and controls the boost circuit to be turned off, so that the charging pile is switched from charging the battery through the boost circuit to charging the battery through the direct connection circuit.When the direct connection circuit is turned on and a switching signal is received, the controller controls the boost circuit to be turned on and then controls the direct connection circuit to be turned off.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle power supply, and particularly relates to a charging circuit, a control method, a vehicle-mounted integrated power supply and a vehicle. BACKGROUND

[0002] With the rapid popularization of electric vehicles and the increasing market share, the demand of users for the charging speed of vehicles is also steadily growing.

[0003] In order to speed up the charging speed, most vehicle manufacturers set a boost circuit and a direct connection circuit in the charging loop. The boost circuit is used to match the charging pile which outputs in a default low voltage mode, and the direct connection circuit is used to match the charging pile which outputs in a higher voltage mode.

[0004] However, since most charging piles on the market are charging piles which output in a low voltage mode, and the boost circuit is used for charging for a long time, the internal components of the charging loop will be accelerated to age, resulting in large internal component loss and gradually decreasing charging efficiency. SUMMARY

[0005] The present application aims to provide a charging circuit, a control method, a vehicle-mounted integrated power supply and a vehicle, and aims to improve charging efficiency.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a charging circuit, which comprises a boost circuit, a direct connection circuit and a controller. The input end of the boost circuit is configured to be connected with a charging pile, the output end of the boost circuit is configured to be connected with a battery, the input end of the direct connection circuit is configured to be connected with the charging pile, and the output end of the direct connection circuit is configured to be connected with the battery. The controller is configured to be connected with the battery, the controller is connected with the boost circuit, the controller is connected with the direct connection circuit, and the controller is further configured to be connected with the charging pile. The controller is configured to: in the case that the boost circuit is turned on and the charging pile meets the condition of switching direct connection charging, control the direct connection circuit to be turned on, and then control the boost circuit to be turned off, so as to switch the charging of the battery by the charging pile through the boost circuit to the charging of the battery by the charging pile through the direct connection circuit, or in the case that the direct connection circuit is turned on and a switching signal is received, control the boost circuit to be turned on, and then control the direct connection circuit to be turned off, so as to switch the charging of the battery by the charging pile through the direct connection circuit to the charging of the battery by the charging pile through the boost circuit.

[0008] In the charging circuit provided in some embodiments of the present application, the charging circuit can control the direct connection circuit to be turned on and the boost circuit to be turned off when the condition for switching to direct connection charging is met, so as to switch from boost circuit charging to direct connection circuit charging. Since the boost circuit is used to raise the voltage of the charging pile to the required voltage of the battery, and a plurality of electronic components are required in this process, heat loss will be generated when the current passes through these electronic components due to the internal resistance of the electronic components and other factors. In particular, in the case of high current or high power, the loss will increase significantly. The switching provided in the present application reduces the energy loss caused by the boost circuit, and significantly improves the charging efficiency.

[0009] In some embodiments, the condition for switching to direct connection charging is that the output voltage of the charging pile is raised to the required voltage of the battery within a first preset time.

[0010] In some embodiments, the controller is further configured to send the required voltage of the battery to the charging pile to raise the output voltage of the charging pile when the boost circuit is turned on.

[0011] In some embodiments, the controller is further configured to reduce the output current of the charging pile to a first preset output current before controlling the direct connection circuit to be turned on and the boost circuit to be turned off.

[0012] In some embodiments, when the direct connection circuit is turned on and the switching signal is received, the boost circuit is controlled to be turned on and the direct connection circuit is controlled to be turned off, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

[0013] In some embodiments, the controller is further configured to reduce the output current of the charging pile to a second preset output current before controlling the boost circuit to be turned on and the direct connection circuit to be turned off.

[0014] In some embodiments, the controller is further configured to control the boost circuit to be turned on and the direct connection circuit to be turned off when the charging pile does not include an insulation detection function. When the charging pile includes an insulation detection function and the charging pile meets the condition for direct connection charging, the controller controls the direct connection circuit to be turned on and the boost circuit to be turned off. When the charging pile includes an insulation detection function and the charging pile does not meet the condition for direct connection charging, the controller controls the direct connection circuit to be turned off and the boost circuit to be turned on. The condition for direct connection charging is that the difference between the output voltage of the charging pile obtained through insulation detection and the required voltage of the battery is greater than or equal to a first threshold value.

[0015] In some embodiments, the boost circuit includes a bridge arm circuit, a motor circuit, and a first switch circuit. A first output of the boost circuit is configured to be connected with a positive pole of the battery, and a second output of the boost circuit is configured to be connected with a negative pole of the battery. A first input of the boost circuit is configured to be connected with a first power supply end of the charging pile, and a second input of the boost circuit is configured to be connected with a second power supply end of the charging pile.

[0016] In some embodiments, a first input of the first switch circuit is connected with the first input of the boost circuit, and a second input of the first switch circuit is connected with the second input of the boost circuit. A first output of the first switch circuit is connected with an input of the motor circuit, an output of the motor circuit is connected with an input of the bridge arm circuit, a first output of the bridge arm circuit is connected with the first output of the boost circuit, and a second output of the bridge arm circuit is connected with the second output of the boost circuit. The second input of the first switch circuit is also connected with the second output of the boost circuit. A controller is connected with the bridge arm circuit, and the controller is also connected with the first switch circuit.

[0017] In some embodiments, the bridge arm circuit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, and a sixth switch tube. A first pole of the first switch tube is connected with the first output of the bridge arm circuit, a second pole of the first switch tube is connected with a first pole of the second switch tube, and a second pole of the second switch tube is connected with the second output of the bridge arm circuit. A first pole of the third switch tube is connected with the first output of the bridge arm circuit, a second pole of the third switch tube is connected with a first pole of the fourth switch tube, and a second pole of the fourth switch tube is connected with the second output of the bridge arm circuit. A first pole of the fifth switch tube is connected with the first output of the bridge arm circuit, a second pole of the fifth switch tube is connected with a first pole of the sixth switch tube, and a second pole of the sixth switch tube is connected with the second output of the bridge arm circuit. A diode is connected between the first pole and the second pole of each switch tube, a positive pole of the diode is connected with the second pole of the connected switch tube, and a negative pole of the diode is connected with the first pole of the connected switch tube. The controller is connected with a third pole of the first switch tube, the controller is connected with a third pole of the second switch tube, the controller is connected with a third pole of the third switch tube, the controller is connected with a third pole of the fourth switch tube, the controller is connected with a third pole of the fifth switch tube, and the controller is connected with a third pole of the sixth switch tube.

[0018] In some embodiments, the motor circuit includes a first winding, a second winding, and a third winding. A first end of the first winding is connected with the input of the motor circuit, a second end of the first winding is connected with the first pole of the fifth switch tube, a first end of the second winding is connected with the input of the motor circuit, a second end of the second winding is connected with the first pole of the third switch tube, a first end of the third winding is connected with the input of the motor circuit, and a second end of the third winding is connected with the first pole of the first switch tube.

[0019] In some embodiments, the first switch circuit includes a first switch and a boost capacitor. A first end of the first switch is connected to the first input end of the boost circuit, and a second end of the first switch is connected to the input end of the motor circuit. A first end of the boost capacitor is connected to the first input end of the boost circuit, and a second end of the boost capacitor is connected to the second output end of the boost circuit. The first switch further includes a control end, and the controller is connected to the control end of the first switch.

[0020] In some embodiments, the first output end of the direct connection circuit is configured to be connected to a positive electrode of the battery, and the second output end of the direct connection circuit is connected to a negative electrode of the battery. The first input end of the direct connection circuit is connected to the first power supply end of the charging pile, and the second input end of the direct connection circuit is connected to the second power supply end of the charging pile. The direct connection circuit includes a second switch, a first end of the second switch is connected to the first input end of the direct connection circuit, and a second end of the second switch is connected to the first output end of the direct connection circuit. The second switch further includes a control end, and the controller is connected to the control end of the second switch.

[0021] In a second aspect, the present application provides a control method of a charging circuit, which is applied to the charging circuit mentioned in the first aspect and possible embodiments thereof. The method includes: in the case that the boost circuit is turned on, judging whether the charging pile meets the condition of switching to direct connection charging. If yes, controlling the direct connection circuit to be turned on, and then controlling the boost circuit to be turned off, so as to switch the charging of the battery by the boost circuit to the charging of the battery by the direct connection circuit. In the case that the direct connection circuit is turned on and a switching signal is received, controlling the boost circuit to be turned on, and then controlling the direct connection circuit to be turned off, so as to switch the charging of the battery by the direct connection circuit to the charging of the battery by the boost circuit.

[0022] In some embodiments, before judging whether the charging pile meets the condition of switching to direct connection charging in the case that the boost circuit is turned on, the control method further includes sending the required voltage of the battery to the charging pile, so as to raise the output voltage of the charging pile.

[0023] In some embodiments, before controlling the direct connection circuit to be turned on and the boost circuit to be turned off, the control method further includes reducing the output current of the charging pile to a first preset output current.

[0024] In some embodiments, the control method further includes: in the case that the direct connection circuit is turned on and a switching signal is received, controlling the boost circuit to be turned on, and then controlling the direct connection circuit to be turned off, so as to switch the charging of the battery by the direct connection circuit to the charging of the battery by the boost circuit.

[0025] In some embodiments, before controlling the boost circuit to be turned on and the direct connection circuit to be turned off, the control method further includes reducing the output current of the charging pile to a second preset output current.

[0026] In some embodiments, the control method further comprises: confirming whether the charging pile comprises an insulation detection function, if yes, determining whether the charging pile meets the conditions for direct connection charging, if yes, controlling the direct connection circuit to be turned on and the boost circuit to be turned off. If no, controlling the direct connection circuit to be turned off and the boost circuit to be turned on. If no, controlling the boost circuit to be turned on and the direct connection circuit to be turned off. The conditions for direct connection charging are that the difference between the output voltage of the charging pile obtained through the insulation detection and the required voltage of the battery is greater than or equal to a first threshold value.

[0027] In some embodiments, before the boost circuit or the direct connection circuit is turned on, the control method further comprises: confirming whether the charging state is entered, and setting a charging end condition.

[0028] In a third aspect, the present application provides a vehicle-mounted integrated power supply comprising a battery and a charging circuit as mentioned in the first aspect and possible embodiments thereof. The battery is connected with the charging circuit.

[0029] In a fourth aspect, the present application provides a vehicle comprising a battery and a charging circuit as mentioned in the first aspect and possible embodiments thereof. The battery is connected with the charging circuit.

[0030] The beneficial effects of the second aspect, the third aspect and the fourth aspect can be referred to the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 A schematic diagram of a charging circuit provided by the embodiments of the present application;

[0033] Figure 2 Another schematic diagram of a charging circuit provided by the embodiments of the present application;

[0034] Figure 3 A schematic diagram of a charging circuit provided by the embodiments of the present application;

[0035] Figure 4 A flowchart of a control method of a charging circuit provided by the embodiments of the present application;

[0036] Figure 5 A schematic diagram of a vehicle-mounted integrated power supply provided by the embodiments of the present application;

[0037] Figure 6 A schematic diagram of a vehicle provided by the embodiments of the present application. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0040] 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0043] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the exemplary or for example embodiments are presented so as to enable a clear and concise disclosure of the present application. Expressions such as "for example," "for instance," "e.g.," "exemplary," "one example is," "for example and not by way of limitation," "for example and not limitation," "for example and not by way of limitation only," and the like mean "serving as an example, instance, or illustration," and should not be construed as "preferred" or "advantageous" over other embodiments or designs.

[0044] With the rapid development of the electric vehicle industry, the charging technology of electric vehicles has also attracted extensive attention and research. In order to meet the needs of users for fast charging, various high-power direct-current charging piles have appeared in the market.

[0045] At present, a large number of electric vehicle charging systems rely on a boost circuit to raise the output voltage of the charging pile to the voltage required by the battery. However, the working process of the boost circuit involves multiple electronic components (motor controller, boost inductor, etc.), which will generate a large energy loss when the current passes through, especially in the case of high-power charging, the loss is more significant, which leads to the decrease of the charging efficiency of the electric vehicle, prolongs the charging time, and affects the user experience.

[0046] Therefore, the embodiments of the present application provide a charging circuit, for example, as shown in Figure 1 The charging circuit 50 includes a boost circuit 1, a direct connection circuit 2, and a controller 3. The input end of the boost circuit 1 is configured to be connected with a charging pile 4, the output end of the boost circuit 1 is configured to be connected with a battery 5, the input end of the direct connection circuit 2 is configured to be connected with the charging pile 4, and the output end of the direct connection circuit 2 is configured to be connected with the battery 5. The controller 3 is configured to be connected with the battery 5, the controller 3 is connected with the boost circuit 1, the controller 3 is connected with the direct connection circuit 2, and the controller 3 is further configured to be connected with the charging pile 4.

[0047] The controller 3 is configured to: in the case that the boost circuit 1 is turned on and the charging pile 4 meets the condition of switching direct connection charging, control the direct connection circuit 2 to be turned on and control the boost circuit 1 to be turned off, so as to switch the charging of the battery 5 by the charging pile 4 through the boost circuit 1 to the charging of the battery 5 by the charging pile 4 through the direct connection circuit 2, or in the case that the direct connection circuit 2 is turned on and a switching signal is received, control the boost circuit 1 to be turned on after the boost circuit 1 is turned on, and then control the direct connection circuit 2 to be turned off, so as to switch the charging of the battery by the charging pile through the direct connection circuit 2 to the charging of the battery 5 by the charging pile through the boost circuit 1. The condition of switching direct connection charging is that the output voltage of the charging pile 4 is raised to the required voltage of the battery 5.

[0048] As a possible implementation manner, the controller 3 can be a vehicle controller, or a controller independent of the vehicle controller and separately controlling the charging of the vehicle.

[0049] The charging circuit provided by the embodiment of the present application no longer uses the boost circuit 1 to charge the battery all the time, and can control the direct connection circuit 2 to be turned on and the boost circuit 1 to be turned off by the controller 3 when the condition of switching to direct connection charging is met, so as to switch the charging path of the battery 5 from the boost circuit 1 to the direct connection circuit 2.

[0050] The boost circuit 1 needs to pass through multiple electronic elements to lift the output voltage of the charging pile 4 to the voltage required by the battery 5, and the current passing through these electronic elements will generate heat loss due to the internal resistance of the elements and other factors. Since the existing charging pile 4 is a high-power charging pile, the current intensity is large, so the heat loss and impedance loss in the electronic elements will be more significant, affecting the charging efficiency, and long-term charging of the battery 5 by the boost circuit 1 will cause a greater burden on the electronic elements in the boost circuit 1, such as the switch tube, reducing the service life.

[0051] The direct connection circuit 2 can directly connect the charging pile 4 and the battery 5, and this direct connection bypasses the complex electronic elements in the boost circuit 1, reducing the additional loss caused by these electronic elements, so that the charging efficiency of the battery is higher. In addition, since the direct connection circuit 2 can directly connect the charging pile 4 and the battery 5, the premise of charging the battery 5 by using or switching the charging path of the direct connection circuit 2 is that the output voltage of the charging pile 4 is close to the required voltage of the battery 5, where the required voltage of the battery 5 refers to the rated voltage of the battery 5.

[0052] Therefore, the controller 3 controls the direct connection circuit 2 to be turned on and the boost circuit 1 to be turned off when the boost circuit 1 is turned on and the output voltage of the charging pile 4 is lifted to the required voltage of the battery 5, so that the charging circuit 50 no longer depends on the work of the boost circuit 1, but is more flexible, shortens the charging time, and prolongs the service life of the electronic elements in the boost circuit 1.

[0053] In addition, the charging circuit 50 provided by the embodiment of the present application not only supports switching from the boost circuit 1 to the direct connection circuit 2, but also supports switching from the direct connection circuit 2 to the boost circuit. After the controller 3 receives the switching signal, the boost circuit 1 can be controlled to be turned on and the direct connection circuit 2 can be controlled to be turned off. This bidirectional charging switching mechanism greatly enhances the flexibility of the charging circuit 50, so that the charging mode can be dynamically adjusted according to the implementation conditions. It should be noted that switching the charging path between the battery 5 and the charging pile 4 from the direct connection circuit 2 to the boost circuit 1 is a proactive process, and the charging strategy can usually be switched only on the premise of the charging path based on the boost circuit 1.

[0054] Reference Figure 1In some embodiments, the condition for switching the direct connection charging is that the output voltage of the charging pile 4 is raised to the required voltage of the battery 5 within a first preset time.

[0055] By setting the first preset time, the unstable charging state caused by the charging pile 4 failing to raise the output voltage within a reasonable time is avoided, and the switching to the direct connection charging mode in an unstable state is prevented, thereby ensuring the stability of the entire charging process and avoiding system failure or charging abnormalities caused by unstable voltage.

[0056] If the output voltage of the charging pile 4 is not raised to the required voltage of the battery 5 within the first preset time, the path of the boost circuit 1 will be maintained to provide the electrical energy of the charging pile 4 to the battery 5, and the switching will be performed only when the output voltage of the charging pile 4 is raised to the required voltage of the battery 5 within the first preset time. This helps to avoid energy loss caused by frequent or improper switching, and further improves the charging efficiency.

[0057] Referring to Figure 1 In some embodiments, the controller 3 is further configured to send the required voltage of the battery 5 to the charging pile 4 to raise the output voltage of the charging pile 4 when the boost circuit 1 is turned on.

[0058] The controller 3 can actively send the required voltage of the battery 5 to the charging pile 4, and the charging pile 4 will adjust the output voltage according to the required voltage, so that the charging pile 4 can quickly respond to the requirements of the battery 5. By precisely controlling the voltage raising process, unnecessary voltage raising process is reduced, and the charging efficiency is further improved. In addition, during the charging process, voltage mismatch may cause instability or charging abnormalities of the system. By actively sending the required voltage of the battery 5 by the controller 3, it is ensured that the output voltage of the charging pile 4 always matches the requirements of the battery, avoiding the problem of instability of the entire charging system (including the battery 5, the charging circuit 50 and the charging pile 4) caused by voltage fluctuation or deficiency.

[0059] Referring to Figure 1 In some embodiments, the controller 3 is further configured to reduce the output current of the charging pile 4 to a first preset output current before controlling the direct connection circuit 2 to be turned on and the boost circuit 1 to be turned off. During the charging process, switching directly from the boost circuit 1 to the direct connection circuit 2 may cause a sudden change in current, thereby causing an impact on the system. By reducing the output current of the charging pile 4 to the first preset output current by the controller 3, the smooth transition of the current is ensured. This pre-current adjustment reduces the instantaneous current fluctuation during switching, avoids possible overcurrent or electrical shock, and thereby improves the safety and stability of the system.

[0060] Direct mode switching can cause overload stress on the battery 5 when charging at high power. By reducing the output current of the charging pile 4, the overload damage to the battery 5 can be effectively avoided, and the charging equipment can be protected from overload in high-power or high-current charging scenarios.

[0061] Referring to Figure 1 In some embodiments, the controller 3 is further configured to reduce the output current of the charging pile 4 to a second preset output current before controlling the boost circuit 1 to turn on and controlling the direct connection circuit 2 to turn off. Reducing the output current before the boost circuit 1 turns on and the direct connection circuit 2 turns off can prevent excessive instantaneous current or fluctuations during circuit switching. By reducing the output current of the charging pile 4 to a preset safe value, the system impact and equipment damage caused by sudden current changes can be avoided, ensuring smooth transition during charging and helping to ensure the stability and safety of the entire charging process.

[0062] Referring to Figure 1 In some embodiments, the controller 3 is further configured to control the boost circuit 1 to turn on and control the direct connection circuit 2 to turn off when the charging pile 4 does not include insulation detection functionality. When the charging pile 4 includes insulation detection functionality and meets the conditions for direct connection charging, the controller 3 controls the direct connection circuit 2 to turn on and controls the boost circuit 1 to turn off. When the charging pile 4 includes insulation detection functionality and does not meet the conditions for direct connection charging, the controller 3 controls the direct connection circuit 2 to turn off and controls the boost circuit 1 to turn on. The conditions for direct connection charging are that the difference between the output voltage of the charging pile 4 obtained through insulation detection and the required voltage of the battery 5 is greater than or equal to a first threshold value.

[0063] When the charging pile 4 has insulation detection functionality, the output of the charging pile 4 can be judged based on the insulation detection voltage to determine whether the output of the charging pile 4 needs to be boosted by the boost circuit 1 to match the charging of the battery 5. When the insulation detection voltage is close to the required voltage of the battery, i.e., the difference between the output voltage of the charging pile 4 obtained through insulation detection and the required voltage of the battery 5 is greater than or equal to a first threshold value, it means that the output voltage of the charging pile 4 is sufficient, and the battery 5 can be directly connected to the charging pile 4 for charging. At this time, the controller 3 controls the direct connection circuit 2 to turn on and controls the boost circuit 1 to turn off, which is more suitable for actual charging scenarios and avoids unnecessary energy loss of electronic components in the boost circuit, making the entire charging process more efficient.

[0064] By judging whether the charging pile 4 has insulation detection functionality and whether the insulation detection voltage meets the conditions for direct connection charging, the controller can flexibly choose the charging path of the boost circuit 1 or the charging path of the direct connection circuit 2. This design ensures that the system can be applied to various types of charging piles 4, greatly enhancing the compatibility of different charging piles 4.

[0065] For the charging pile 4 without insulation detection function, the controller 3 selects the boost circuit 1 to charge, so as to avoid potential danger caused by voltage mismatch between the charging pile 4 and the battery 5. By using the boost circuit 1, it is ensured that the voltage adjustment during charging is more stable, and the safety hidden danger is reduced. In the case of having insulation detection function and meeting the direct connection charging condition, the charging is directly performed by using the direct connection circuit 2, and the charging speed is improved.

[0066] As a possible implementation manner, as shown in Figure 2 The boost circuit 1 includes a bridge arm circuit 11, a motor circuit 12 and a first switch circuit 13. A first output end 1-1 of the boost circuit 1 is configured to be connected with a positive electrode of the battery 5, and a second output end 1-2 of the boost circuit 1 is configured to be connected with a negative electrode of the battery 5. A first input end 1-3 of the boost circuit 1 is configured to be connected with a first power supply end of the charging pile 4, and a second input end 1-4 of the boost circuit 1 is configured to be connected with a second power supply end of the charging pile 4.

[0067] The first input end of the first switch circuit 13 is connected with the first input end 1-3 of the boost circuit 1, and the second input end of the first switch circuit 13 is connected with the second input end 1-4 of the boost circuit 1. The first output end of the first switch circuit 13 is connected with the input end of the motor circuit 12, the output end of the motor circuit 12 is connected with the input end of the bridge arm circuit 11, the first output end of the bridge arm circuit 11 is connected with the first output end of the boost circuit 1, and the second output end of the bridge arm circuit 11 is connected with the second output end 1-2 of the boost circuit 1. The second input end of the first switch circuit 13 is also connected with the second output end 1-2 of the boost circuit 1. The controller 3 is connected with the bridge arm circuit 11, and the controller 3 is also connected with the first switch circuit 13.

[0068] In some embodiments, as shown in Figure 3 The bridge arm circuit 11 includes a first switch tube 111, a second switch tube 112, a third switch tube 113, a fourth switch tube 114, a fifth switch tube 115 and a sixth switch tube 116. The first pole of the first switch tube 111 is connected with the first output end of the bridge arm circuit 11, the second pole of the first switch tube 111 is connected with the first pole of the second switch tube 112, and the second pole of the second switch tube 112 is connected with the second output end of the bridge arm circuit 11. The first pole of the third switch tube 113 is connected with the first output end of the bridge arm circuit 11, the second pole of the third switch tube 113 is connected with the first pole of the fourth switch tube 114, and the second pole of the fourth switch tube 114 is connected with the second output end of the bridge arm circuit 11. The first pole of the fifth switch tube 115 is connected with the first output end of the bridge arm circuit 11, the second pole of the fifth switch tube 115 is connected with the first pole of the sixth switch tube 116, and the second pole of the sixth switch tube 116 is connected with the second output end of the bridge arm circuit 11.

[0069] A diode 117 is connected between the first pole and the second pole of each switch tube, the positive pole of the diode 117 is connected with the second pole of the connected switch tube, and the negative pole of the diode 117 is connected with the first pole of the connected switch tube. The controller 3 is connected with the third pole of the first switch tube 111, the third pole of the second switch tube 112, the third pole of the third switch tube 113, the third pole of the fourth switch tube 114, the third pole of the fifth switch tube 115, and the third pole of the sixth switch tube 116.

[0070] Exemplarily, the switch tube can be a triode or a field effect tube. When the switch tube is a triode, the third pole of the switch tube is the base of the triode, the second pole of the switch tube is one of the emitter and the collector of the triode, and the first pole of the switch tube is the other of the emitter and the collector of the triode. When the switch tube is a field effect tube, the third pole of the switch tube is the gate of the field effect tube, the second pole of the switch tube is one of the source and the drain of the field effect tube, and the first pole of the switch tube is the other of the source and the drain of the field effect tube.

[0071] As a possible implementation, as shown in Figure 3 The motor circuit 12 includes a first winding 121, a second winding 122, and a third winding 123. The first end of the first winding 121 is connected with the input end of the motor circuit 12, the second end of the first winding 121 is connected with the first pole of the fifth switch tube 115, the first end of the second winding 122 is connected with the input end of the motor circuit 12, the second end of the second winding 122 is connected with the first pole of the third switch tube 123, the first end of the third winding 123 is connected with the input end of the motor circuit 12, and the second end of the third winding 123 is connected with the first pole of the first switch tube 111.

[0072] As a possible implementation, as shown in Figure 3 The first switch circuit 13 includes a first switch 131 and a boost capacitor 132. The first end of the first switch 131 is connected with the first input end of the boost circuit, and the second end of the first switch 131 is connected with the input end of the motor circuit 12. The first end of the boost capacitor 132 is connected with the first input end of the boost circuit, and the second end of the boost capacitor 132 is connected with the second output end of the boost circuit. The first switch 131 further includes a control end, and the controller 3 is connected with the control end of the first switch 131.

[0073] As a possible implementation, as shown in Figure 3As shown, the first output end of the direct connection circuit is configured to be connected with the positive pole of the battery, and the second output end of the direct connection circuit is connected with the negative pole of the battery. The first input end of the direct connection circuit is connected with the first power supply end of the charging pile, and the second input end of the direct connection circuit is connected with the second power supply end of the charging pile. The direct connection circuit comprises a second switch 21, the first end of the second switch 21 is connected with the first input end of the direct connection circuit, and the second end of the second switch 21 is connected with the first output end of the direct connection circuit. The second switch 21 further comprises a control end, and the controller is connected with the control end of the second switch.

[0074] Referring to Figure 3 When the charging path between the battery 5 and the charging pile 4 is through the boost circuit, the controller 3 controls the first switch 131 to be closed and controls the second switch 21 to be opened. The electric signal output by the charging pile 4 is transmitted to the bridge arm circuit 11 through the motor circuit 12, and the controller 3 controls the first switch tube 111, the second switch tube 112, the third switch tube 113, the fourth switch tube 114, the fifth switch tube 115 and the sixth switch tube 116 to be opened in a certain time sequence through the control of the third pole of the switch tube, so that the boost capacitor 132 stores energy. Then the controller 3 controls the first switch tube 111, the third switch tube 113 and the fifth switch tube 115 to be opened, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to be closed, so that the energy stored in the boost capacitor 132 is released, thereby realizing the voltage input to the battery 5 is boosted.

[0075] With the continuous charging, the output voltage of the charging pile 4 is also rising, when the output voltage of the charging pile 4 approaches the required voltage of the battery 5, the controller 3 controls the second switch 21 to be closed, controls the first switch 131 to be opened, and controls the first switch tube 111, the second switch tube 112, the third switch tube 113, the fourth switch tube 114, the fifth switch tube 115 and the sixth switch tube 116 to be closed. The charging pile 4 is directly connected with the battery 5.

[0076] The embodiment of the application further provides a control method of a charging circuit, which is applied in the charging circuit as described above, and can be particularly applied in the controller of the charging circuit. As an example, Figure 4 As shown, the control method of the charging circuit comprises:

[0077] S11: judging whether the charging pile meets the condition of switching the direct connection charging in the case that the boost circuit is turned on.

[0078] If yes, the direct connection circuit is controlled to be turned on, and the boost circuit is controlled to be turned off, so that the charging of the battery by the charging pile through the boost circuit is switched to the charging of the battery by the charging pile through the direct connection circuit.

[0079] S12: In the case that the direct connection circuit is turned on, and the switching signal is received, the controller controls the boost circuit to be turned on, and the direct connection circuit to be turned off, so as to switch the charging mode of the charging pile from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

[0080] The condition of switching the direct connection charging is that the output voltage of the charging pile is lifted to the required voltage of the battery.

[0081] Referring to Figure 3 In the case that the boost circuit is turned on, the second switch 21 is turned off, and the first switch 131 is turned on. The controller 3 controls the first switch tube 111, the second switch tube 112, the third switch tube 113, the fourth switch tube 114, the fifth switch tube 115 and the sixth switch tube 116 to be turned on in a certain time sequence, so as to store energy in the boost capacitor 132. Then the controller 3 controls the first switch tube 111, the third switch tube 113 and the fifth switch tube 115 to be turned on, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to be turned off, so as to release the energy stored in the boost capacitor 132, thereby realizing the voltage input to the battery 5 is lifted.

[0082] When the output voltage of the charging pile 4 is lifted to the required voltage of the battery 5, the controller 3 controls the second switch 21 to be turned on, the first switch 131 to be turned off, and the first switch tube 111, the second switch tube 112, the third switch tube 113, the fourth switch tube 114, the fifth switch tube 115 and the sixth switch tube 116 to be turned off, so as to switch the charging path between the battery 5 and the charging pile 4 from the boost circuit to the direct connection circuit.

[0083] When the output voltage of the charging pile 4 is not lifted to the required voltage of the battery 5, the controller 3 still controls the second switch 21 to be turned off, and the first switch 131 to be turned on. The controller 3 controls the first switch tube 111, the second switch tube 112, the third switch tube 113, the fourth switch tube 114, the fifth switch tube 115 and the sixth switch tube 116 to be turned on in a certain time sequence, so as to store energy in the boost capacitor 132. Then the controller 3 controls the first switch tube 111, the third switch tube 113 and the fifth switch tube 115 to be turned on, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to be turned off, so as to release the energy stored in the boost capacitor 132.

[0084] When the charging pile 4 meets the switching condition of direct connection charging, the controller 3 converts the charging path between the battery 5 and the charging pile 4 from the boost circuit to the direct connection circuit, and no longer relies on the boost circuit for charging all the time. This intelligent switching avoids energy loss generated by the boost circuit under high voltage conditions, especially the heat generated when the current passes through the windings in the motor circuit 12 and the switch tubes in the bridge arm circuit 11, improves the charging efficiency, speeds up the charging speed, and meets the user's demand for fast charging.

[0085] Furthermore, before switching the charging path, the controller 3 will judge whether the switching condition is met. This pre-judgment mechanism ensures that the current and voltage during charging are within a safe range, thereby preventing the stability and safety of the charging process from being reduced due to inappropriate switching.

[0086] Since the charging efficiency is higher when the direct connection circuit is used as the charging path between the battery and the charging pile than when the boost circuit is used as the charging path, the boost circuit is controlled to be turned on and the direct connection circuit is controlled to be turned off only when the controller receives a switching signal to switch the charging path.

[0087] It should be understood that, in order to smoothly transition the current and avoid possible overcurrent or electrical shock during the switching process, the control method further includes S22: reducing the output current of the charging pile to a second preset output current before the boost circuit is controlled to be turned on and the direct connection circuit is controlled to be turned off.

[0088] Reducing the output current before the boost circuit is turned on and the direct connection circuit is turned off can prevent excessive instantaneous current or fluctuations during circuit switching. By reducing the output current of the charging pile to a preset safe value, system shocks and equipment damage caused by sudden changes in current are avoided, thereby ensuring smooth transition of the charging process and helping to ensure the stability and safety of the entire charging process.

[0089] For example, with reference to Figure 4 Before the boost circuit is turned on, the control method further includes:

[0090] S0: Send the required voltage of the battery to the charging pile to raise the output voltage of the charging pile.

[0091] For example, with reference to Figure 4 Before the direct connection circuit is turned on and the boost circuit is turned off, the control method further includes:

[0092] S21: Reduce the output current of the charging pile to a first preset output current.

[0093] For example, with reference to Figure 1In the charging process, directly switching from the boost circuit 1 to the direct connection circuit 2 can cause a sudden change in current, thereby causing a shock to the system. By reducing the output current of the charging pile 4 to a first preset output current through the controller 3, the smooth transition of the current is ensured. This pre-current adjustment reduces the instantaneous current fluctuation during switching, avoids possible overcurrent or electrical shock, thereby improving the safety and stability of the system.

[0094] As a possible implementation, the control method further comprises:

[0095] Confirming whether the charging pile contains an insulation detection function.

[0096] If yes, determining whether the charging pile meets the direct connection charging condition. If yes, controlling the direct connection circuit to be turned on and the boost circuit to be turned off. If no, controlling the direct connection circuit to be turned off and the boost circuit to be turned on.

[0097] If no, controlling the boost circuit to be turned on and the direct connection circuit to be turned off. The direct connection charging condition is that the difference between the output voltage of the charging pile obtained through insulation detection and the required voltage of the battery is greater than or equal to a first threshold value.

[0098] Referring to Figure 1 When the charging pile 4 has an insulation detection function, it can be determined according to the insulation detection voltage output by the charging pile 4 whether the output of the charging pile 4 needs to be boosted by the boost circuit 1 to match the charging of the battery 5. When the insulation detection voltage is close to the required voltage of the battery, that is, the difference between the output voltage of the charging pile 4 obtained through insulation detection and the required voltage of the battery 5 is greater than or equal to a first threshold value, it means that the output voltage of the charging pile 4 is sufficient, and the battery 5 can be directly connected to the charging pile 4 for charging. At this time, the controller 3 controls the direct connection circuit 2 to be turned on and the boost circuit 1 to be turned off, which is more suitable for the actual charging scene and avoids unnecessary energy loss of electronic elements in the boost circuit, and the entire charging process is more efficient.

[0099] In some embodiments, before the boost circuit or the direct connection circuit is turned on, the control method further comprises: confirming whether to enter a charging state and setting a charging end condition. The confirmation of the charging state can prevent overcharging or mischarging of the battery. The charging condition can be set as the battery being fully charged, or the battery having an amount of electricity greater than a certain amount of electricity threshold. In the scene where the charging time is urgent, it is more appropriate to set the amount of electricity of the battery greater than a certain amount of electricity threshold as the charging end condition, which can save time on the basis of meeting the basic power supply driving of the battery. Setting the charging end condition can be freely set according to the actual application scene, greatly enhancing the flexibility of use.

[0100] The present application provides a vehicle-mounted integrated power supply, for example, Figure 5As shown. The on-board power supply 60 includes the battery 5 and the charging circuit 50 as described above, and the battery 5 is connected to the charging circuit 50.

[0101] The battery 5 and the charging circuit 50 are integrated into an integrated system, i.e. the on-board power supply 60, which reduces the space occupation and helps to save the physical space of the vehicle and reduce the complexity of the vehicle manufacturing. Since the charging circuit 50 provided by the present application can intelligently switch (switch the charging path between the battery 5 and the charging pile from the direct connection circuit to the step-up circuit or from the step-up circuit to the direct connection circuit), it can ensure that the energy loss is minimized during charging, optimize the charging efficiency of the battery, and prolong the service life of the battery due to the reduction of the overheating or overvoltage phenomenon of the battery caused by unnecessary energy loss.

[0102] The present application provides a vehicle, for example, Figure 6 As shown. The vehicle 100 includes the battery 5 and the charging circuit 50 as described above, and the battery 5 is connected to the charging circuit 50.

[0103] In the description of the present application, the specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0104] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A charging circuit, characterized in that, The charging circuit includes a boost circuit, a direct-connect circuit, and a controller; The input terminal of the boost circuit is configured to be connected to the charging pile, and the output terminal of the boost circuit is configured to be connected to the battery. The input terminal of the direct connection circuit is configured to be connected to the charging pile, and the output terminal of the direct connection circuit is configured to be connected to the battery. The controller is configured to be connected to the battery, the controller is connected to the boost circuit, the controller is connected to the direct connection circuit, and the controller is also configured to be connected to the charging pile; The controller is configured to: when the boost circuit is turned on and the charging pile meets the conditions for switching to direct charging, after controlling the direct charging circuit to turn on, control the boost circuit to turn off, so that the charging pile switches from charging the battery through the boost circuit to charging the battery through the direct charging circuit; or; When the direct connection circuit is turned on and a switching signal is received, the boost circuit is turned on, and then the direct connection circuit is turned off, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit; the condition for switching to direct connection charging is that the output voltage of the charging pile rises to the required voltage of the battery within a first preset time. The controller is also configured to: If the charging pile does not include an insulation detection function, control the boost circuit to be turned on and control the direct connection circuit to be turned off; If the charging pile includes an insulation detection function and meets the conditions for direct charging, the direct connection circuit is controlled to be turned on and the boost circuit is controlled to be turned off; if the charging pile includes an insulation detection function and does not meet the conditions for direct charging, the direct connection circuit is controlled to be turned off and the boost circuit is controlled to be turned on. The condition for direct charging is that the difference between the output voltage of the charging pile obtained through insulation detection and the required voltage of the battery is greater than or equal to a first threshold.

2. The charging circuit according to claim 1, characterized in that, The controller is also configured to send the required voltage of the battery to the charging pile when the boost circuit is turned on, so as to boost the output voltage of the charging pile.

3. The charging circuit according to claim 1, characterized in that, The controller is also configured to reduce the output current of the charging pile to a first preset output current before controlling the direct connection circuit to be turned on and the boost circuit to be turned off.

4. The charging circuit according to claim 1, characterized in that, The controller is also configured to: control the boost circuit to turn on, and before controlling the direct connection circuit to disconnect, reduce the output current of the charging pile to a second preset output current.

5. The charging circuit according to claim 1, characterized in that, The boost circuit includes a bridge arm circuit, a motor circuit, and a first switching circuit; The first output terminal of the boost circuit is configured to be connected to the positive terminal of the battery, and the second output terminal of the boost circuit is configured to be connected to the negative terminal of the battery; the first input terminal of the boost circuit is configured to be connected to the first power supply terminal of the charging pile, and the second input terminal of the boost circuit is configured to be connected to the second power supply terminal of the charging pile.

6. The charging circuit according to claim 5, characterized in that, The first input terminal of the first switching circuit is connected to the first input terminal of the boost circuit, and the second input terminal of the first switching circuit is connected to the second input terminal of the boost circuit; the first output terminal of the first switching circuit is connected to the input terminal of the motor circuit, the output terminal of the motor circuit is connected to the input terminal of the bridge arm circuit, the first output terminal of the bridge arm circuit is connected to the first output terminal of the boost circuit, and the second output terminal of the bridge arm circuit is connected to the second output terminal of the boost circuit; the second input terminal of the first switching circuit is also connected to the second output terminal of the boost circuit. The controller is connected to the bridge arm circuit and is also connected to the first switch circuit.

7. The charging circuit according to claim 6, characterized in that, The bridge arm circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. The first terminal of the first switching transistor is connected to the first output terminal of the bridge arm circuit, the second terminal of the first switching transistor is connected to the first terminal of the second switching transistor, and the second terminal of the second switching transistor is connected to the second output terminal of the bridge arm circuit. The first terminal of the third switch is connected to the first output terminal of the bridge arm circuit, the second terminal of the third switch is connected to the first terminal of the fourth switch, and the second terminal of the fourth switch is connected to the second output terminal of the bridge arm circuit. The first terminal of the fifth switch is connected to the first output terminal of the bridge arm circuit, the second terminal of the fifth switch is connected to the first terminal of the sixth switch, and the second terminal of the sixth switch is connected to the second output terminal of the bridge arm circuit. A diode is connected between the first and second terminals of each switching transistor. The positive terminal of the diode is connected to the second terminal of the connected switching transistor, and the negative terminal of the diode is connected to the first terminal of the connected switching transistor. The controller is connected to the third terminal of the first switching transistor, the controller is connected to the third terminal of the second switching transistor, the controller is connected to the third terminal of the third switching transistor, the controller is connected to the third terminal of the fourth switching transistor, the controller is connected to the third terminal of the fifth switching transistor, and the controller is connected to the third terminal of the sixth switching transistor.

8. The charging circuit according to claim 7, characterized in that, The motor circuit includes a first winding, a second winding, and a third winding; The first end of the first winding is connected to the input terminal of the motor circuit, the second end of the first winding is connected to the first pole of the fifth switching transistor, the first end of the second winding is connected to the input terminal of the motor circuit, the second end of the second winding is connected to the first pole of the third switching transistor, the first end of the third winding is connected to the input terminal of the motor circuit, and the second end of the third winding is connected to the first pole of the first switching transistor.

9. The charging circuit according to claim 6, characterized in that, The first switching circuit includes a first switch and a boost capacitor; a first terminal of the first switch is connected to a first input terminal of the boost circuit, and a second terminal of the first switch is connected to the input terminal of the motor circuit. The first terminal of the boost capacitor is connected to the first input terminal of the boost circuit, and the second terminal of the boost capacitor is connected to the second output terminal of the boost circuit. The first switch also includes a control terminal, and the controller is connected to the control terminal of the first switch.

10. The charging circuit according to claim 1, characterized in that, The first output terminal of the direct connection circuit is configured to be connected to the positive terminal of the battery, and the second output terminal of the direct connection circuit is connected to the negative terminal of the battery; the first input terminal of the direct connection circuit is connected to the first power supply terminal of the charging pile, and the second input terminal of the direct connection circuit is connected to the second power supply terminal of the charging pile. The direct-connect circuit includes a second switch; The first end of the second switch is connected to the first input end of the direct-connect circuit, and the second end of the second switch is connected to the first output end of the direct-connect circuit. The second switch also includes a control terminal, and the controller is connected to the control terminal of the second switch.

11. A control method for a charging circuit, applied in the charging circuit as described in any one of claims 1 to 10, characterized in that, The method includes: With the boost circuit on, determine whether the charging pile meets the conditions for switching to direct charging; If so, after the direct connection circuit is turned on, the boost circuit is turned off, so that the charging pile switches from charging the battery through the boost circuit to charging the battery through the direct connection circuit. When the direct connection circuit is turned on and a switching signal is received, the boost circuit is turned on and then the direct connection circuit is turned off, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit. The condition for switching to direct connection charging is that the output voltage of the charging pile rises to the required voltage of the battery within a first preset time. The control method also includes: confirming whether the charging pile includes an insulation detection function. If so, then determine whether the charging pile meets the conditions for direct charging. If so, control the direct-connect circuit to turn on and control the boost circuit to turn off; If not, disconnect the direct connection circuit and turn on the boost circuit; If not, the boost circuit is turned on and the direct connection circuit is turned off; The condition for direct charging is that the difference between the output voltage of the charging pile obtained through insulation detection and the required voltage of the battery is greater than or equal to a first threshold.

12. The control method according to claim 11, characterized in that, When the boost circuit is turned on, before determining whether the charging pile meets the conditions for switching to direct charging, the control method further includes sending the required voltage of the battery to the charging pile so as to boost the output voltage of the charging pile.

13. The control method according to claim 11, characterized in that, Before controlling the direct connection circuit to be turned on and the boost circuit to be turned off, the control method further includes reducing the output current of the charging pile to a first preset output current.

14. The control method according to claim 11, characterized in that, Before controlling the boost circuit to turn on and the direct connection circuit to turn off, the control method further includes reducing the output current of the charging pile to a second preset output current.

15. The control method according to claim 11, characterized in that, Before the boost circuit or the direct-connect circuit is turned on, the control method further includes: Confirm whether the device has entered charging mode and set the conditions for ending charging.

16. An integrated vehicle power supply, characterized in that, It includes a charging circuit as described in any one of claims 1 to 10, and a battery connected to the charging circuit.

17. A vehicle, characterized in that, It includes a battery and a charging circuit as described in any one of claims 1 to 10, wherein the battery is connected to the charging circuit.

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