Charging circuit, control method, vehicle-mounted integrated power supply and vehicle

Abstract

The invention 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 the charging efficiency. The charging circuit comprises a booster circuit, a direct connection circuit and a controller. The input end of the booster circuit is connected with the charging pile, the output end of the booster circuit is connected with the 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 booster circuit, the direct connection circuit and the charging pile. And the controller controls the direct connection circuit to be conducted and controls the booster circuit to be disconnected under the conditions that the booster circuit is conducted and the charging pile meets the condition of switching direct connection charging, so that the charging pile charges the battery through the direct connection circuit instead of charging the battery through the booster circuit. And when the direct connection circuit is switched on and the switching signal is received, the direct connection circuit is controlled to be switched off after the boosted circuit is controlled to be switched on.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle power supply, and in particular to a charging circuit, a control method, a vehicle-mounted integrated power supply and a vehicle. Background Art

[0002] With the rapid popularization of electric vehicles and their increasing market share, users' demand for car charging speed has also steadily increased.

[0003] In order to speed up the charging process, most car companies have set up a boost circuit and a direct connection circuit in the charging circuit. The boost circuit is used to match the charging pile that outputs in a low-voltage mode by default, while the direct connection circuit is used to match the charging pile that outputs in a higher voltage mode.

[0004] However, since most charging piles on the market are low-voltage output charging piles, long-term use of boost circuit charging will accelerate the aging of components inside the charging circuit, resulting in large losses in internal components and a gradual decrease in charging efficiency. Summary of the invention

[0005] The object of the present invention is to provide a charging circuit, a control method, a vehicle-mounted integrated power supply and a vehicle, aiming at improving the charging efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] In a first aspect, the present invention provides a charging circuit, which includes a boost circuit, a direct connection circuit, and a controller. The input end of the boost circuit is configured to be connected to a charging pile, the output end of the boost circuit is configured to be connected to a battery, the input end of the direct connection circuit is configured to be connected to a charging pile, and the output end of the direct connection circuit is configured to be connected to a battery. The controller is configured to be connected to a 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 a 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 connection charging, after controlling the direct connection circuit to be turned on, control the boost circuit to be disconnected, so that the charging pile switches from charging the battery through the boost circuit to charging the battery through the direct connection circuit, or, when the direct connection circuit is turned on and a switching signal is received, after controlling the boost circuit to be turned on, control the direct connection circuit to be disconnected, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery 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 under the condition of switching direct connection charging, and convert the boost circuit charging into direct connection circuit charging. Since the function of the boost circuit is to increase the voltage of the charging pile to the voltage required by the battery, and in this process it needs to pass through multiple electronic components, when the current passes through these electronic components, heat loss will be generated due to the internal resistance of the electronic components and other factors, especially in the case of high current or high power, the loss will increase significantly. The switching provided by 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 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: when the boost circuit is turned on, send the required voltage of the battery to the charging pile to increase the output voltage of the charging pile.

[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 controlling the boost circuit to be turned off.

[0012] In some embodiments, when the direct connection circuit is turned on and a switching signal is received, the boost circuit is controlled to be turned on and the direct connection circuit is controlled to be disconnected, 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: control the boost circuit to be turned on, and before controlling the direct connection circuit to be disconnected, reduce the output current of the charging pile to a second preset output current.

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

[0015] In some embodiments, the boost circuit includes a bridge arm circuit, a motor circuit, and a first switch circuit. The first output terminal of the boost circuit is configured to be connected to the positive electrode of the battery, and the second output terminal of the boost circuit is configured to be connected to the negative electrode 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.

[0016] In some embodiments, the first input end of the first switch circuit is connected to the first input end of the boost circuit, and the second input end of the first switch circuit is connected to the second input end of the boost circuit. The first output end of the first switch circuit is connected to the input end of the motor circuit, the output end of the motor circuit is connected to the input end of the bridge arm circuit, the first output end of the bridge arm circuit is connected to the first output end of the boost circuit, and the second output end of the bridge arm circuit is connected to the second output end of the boost circuit. The second input end of the first switch circuit is also connected to the second output end of the boost circuit. The controller is connected to the bridge arm circuit, and the controller is also connected to 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 second switch tube, a fifth switch tube and a sixth switch tube. The first pole of the first switch tube is connected to the first output end of the bridge arm circuit, the second pole of the first switch tube is connected to the first pole of the second switch tube, and the second pole of the second switch tube is connected to the second output end of the bridge arm circuit. The first pole of the third switch tube is connected to the first output end of the bridge arm circuit, the second pole of the third switch tube is connected to the first pole of the second switch tube, and the second pole of the second switch tube is connected to the second output end of the bridge arm circuit. The first pole of the fifth switch tube is connected to the first output end of the bridge arm circuit, the second pole of the fifth switch tube is connected to the first pole of the sixth switch tube, and the second pole of the sixth switch tube is connected to the second output end of the bridge arm circuit. A diode is connected between the first pole and the second pole of each switch tube, the positive pole of the diode is connected to the second pole of the connected switch tube, and the negative pole of the diode is connected to the first pole of the connected switch tube. The controller is connected to the third pole of the first switch tube, the controller is connected to the third pole of the second switch tube, the controller is connected to the third pole of the third switch tube, the controller is connected to the third pole of the second switch tube, the controller is connected to the third pole of the fifth switch tube, and the controller is connected to the 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. The first end of the first winding is connected to the input end of the motor circuit, the second end of the first winding is connected to the first pole of the fifth switch tube, the first end of the second winding is connected to the input end of the motor circuit, the second end of the second winding is connected to the first pole of the third switch tube, the first end of the third winding is connected to the input end of the motor circuit, and the second end of the third winding is connected to the first pole of the first switch tube.

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

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

[0021] In a second aspect, the present application provides a method for controlling a charging circuit, which is applied to a charging circuit as mentioned in the first aspect and its possible embodiments. The method includes: when the boost circuit is turned on, judging whether the charging pile meets the conditions for switching to direct charging. If so, after controlling the direct circuit to be turned on, the boost circuit is controlled to be disconnected, so that the charging pile switches from charging the battery through the boost circuit to charging the battery through the direct circuit. When the direct circuit is turned on and a switching signal is received, after controlling the boost circuit to be turned on, the direct circuit is controlled to be disconnected, so that the charging pile switches from charging the battery through the direct circuit to charging the battery through the boost circuit.

[0022] In some embodiments, when the boost circuit is turned on, before determining whether the charging pile meets the conditions for switching to direct charging, the control method also includes sending the required voltage of the battery to the charging pile to increase the output voltage of the charging pile.

[0023] In some embodiments, before controlling the direct connection circuit to be turned on and controlling 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: when the direct connection circuit is turned on and a switching signal is received, controlling the boost circuit to be turned on, and controlling the direct connection circuit to be disconnected, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

[0025] In some embodiments, before controlling the boost circuit to be turned on and controlling the direct-connect 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 includes: confirming whether the charging pile includes an insulation detection function, and if so, determining whether the charging pile meets the conditions for direct charging, and if so, controlling the direct connection circuit to be turned on and the boost circuit to be turned off. If not, controlling the direct connection circuit to be turned off and the boost circuit to be turned on. If not, controlling the boost circuit to be turned on and the direct connection circuit to be turned off. The condition for direct charging is that the difference between the output voltage of the charging pile obtained by insulation detection and the required voltage of the battery is greater than or equal to the first threshold.

[0027] In some embodiments, before the boost circuit or the direct-connect circuit is turned on, the control method further includes: confirming whether to enter a charging state, and setting a charging end condition.

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

[0030] Among them, the beneficial effects of the second aspect, the third aspect and the fourth aspect can refer to the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0032] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of the present application;

[0033] Figure 2 Another charging circuit schematic diagram provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the composition of a charging circuit provided in an embodiment of the present application;

[0035] Figure 4 A flowchart of a method for controlling a charging circuit provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of an on-vehicle integrated power supply provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of a vehicle provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 the present invention.

[0039] In the description of the invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or relative positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the drawings is satisfied.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0043] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0044] With the rapid development of the electric vehicle industry, electric vehicle charging technology has also received widespread attention and research. In order to meet users' demand for fast charging, a variety of high-power DC charging piles have appeared on the market.

[0045] At present, a large number of electric vehicle charging systems rely on boost circuits 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 produce large energy losses when current passes through, especially in the case of high-power charging, the loss is more significant, which leads to a decrease in the charging efficiency of electric vehicles, prolongs the charging time, and affects the user experience.

[0046] In view of this, an embodiment of the present application provides a charging circuit, illustratively, as Figure 1 As shown. 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 to the charging pile 4, the output end of the boost circuit 1 is configured to be connected to the battery 5, the input end of the direct connection circuit 2 is configured to be connected to the charging pile 4, and the output end of the direct connection circuit 2 is configured to be connected to the battery 5. The controller 3 is configured to be connected to the battery 5, the controller 3 is connected to the boost circuit 1, the controller 3 is connected to the direct connection circuit 2, and the controller 3 is also configured to be connected to the charging pile 4.

[0047] The controller 3 is configured to: when the boost circuit 1 is turned on and the charging pile 4 meets the conditions for switching to direct charging, control the direct circuit 2 to be turned on and control the boost circuit 1 to be turned off, so that the charging pile 4 switches from charging the battery 5 through the boost circuit 1 to charging the battery 5 through the direct circuit 2, or, when the direct circuit 2 is turned on and a switching signal is received, control the boost circuit 1 to be turned on and then control the direct circuit 2 to be turned off, so that the charging pile switches from charging the battery through the direct circuit 2 to charging the battery 5 through the boost circuit 1. The condition for switching to direct charging is: the output voltage of the charging pile 4 is raised to the required voltage of the battery 5.

[0048] As a possible implementation, the controller 3 may be a vehicle controller, or a controller that is independent of the vehicle controller and controls the charging of the vehicle alone.

[0049] The charging circuit provided in the embodiment of the present application no longer uses the boost circuit 1 to charge the battery all the time. When the conditions for switching to direct charging are met, the controller 3 can control the direct circuit 2 to be turned on and the boost circuit 1 to be turned off, thereby switching the charging path of the battery 5 that obtains electrical energy from the charging pile 4 from the boost circuit 1 to the direct circuit 2.

[0050] The boost circuit 1 needs to pass through multiple electronic components to raise the output voltage of the charging pile 4 to the voltage required by the battery 5. When the current passes through these electronic components, heat loss will be generated due to the internal resistance of the components and other factors. Since the existing charging piles 4 are all high-power charging piles with high current intensity, the heat loss and impedance loss in the electronic components will be more significant, affecting the charging efficiency. In addition, long-term use of the boost circuit 1 to charge the battery 5 will cause a greater burden on the electronic components in the boost circuit 1, such as the switch tube, and reduce the service life.

[0051] The direct connection circuit 2 can directly connect the charging pile 4 to the battery 5. This direct connection bypasses the complex electronic components in the boost circuit 1, reduces the additional losses caused by these electronic components, and thus makes the battery charging efficiency higher. In addition, since the direct connection circuit 2 can directly connect the charging pile 4 to the battery 5, the premise of using or switching the charging path of the direct connection circuit 2 to charge the battery 5 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, when the boost circuit 1 is turned on and the output voltage of the charging pile 4 is raised to the required voltage of the battery 5, the controller 3 controls the direct connection circuit 2 to be turned on and controls the boost circuit 1 to be disconnected, so that the charging circuit 50 is no longer dependent on the operation of the boost circuit 1, but is more flexible, shortening the time of the charging process and extending the service life of the electronic components in the boost circuit 1.

[0053] In addition, the charging circuit 50 provided in 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, it can control the boost circuit 1 to be turned on and the direct connection circuit 2 to be disconnected. 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 the switching of the charging path between the battery 5 and the charging pile 4 from the direct connection circuit 2 to the boost circuit 1 is an active process, and usually the charging strategy can only be switched under the premise that the charging path based on the boost circuit 1 can be implemented.

[0054] Reference Figure 1In some embodiments, the condition for switching to direct 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, an unstable charging state caused by the inability of the charging pile 4 to increase the output voltage within a reasonable time is avoided, and switching to the direct charging mode under unstable conditions is prevented, thereby ensuring the stability of the entire charging process and avoiding system failures or charging abnormalities caused by unstable voltage.

[0056] If the output voltage of the charging pile 4 is not increased to the required voltage of the battery 5 within the first preset time, the boost circuit 1 will continue to be used to provide the power of the charging pile 4 to the battery 5 until the output voltage of the charging pile 4 is increased 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 improve charging efficiency.

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

[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 needs of the battery 5. By accurately controlling the voltage boost process, unnecessary boost processes are reduced, and the charging efficiency is further improved. In addition, during the charging process, voltage mismatch may cause system instability or charging abnormalities. By actively sending the required voltage of the battery 5 through the controller 3, it is ensured that the output voltage of the charging pile 4 always matches the battery's needs, avoiding the problem of instability of the entire charging system (including the battery 5, the charging circuit 50 and the charging pile 4) due to voltage fluctuations or insufficiency.

[0059] Reference 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 controlling 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. The output current of the charging pile 4 is reduced to the first preset output current by the controller 3 to ensure a smooth transition of the current. This pre-current regulation reduces instantaneous current fluctuations during switching, avoids possible overcurrent or electrical shock, and thus improves the safety and stability of the system.

[0060] When charging at high power, directly switching modes may cause overload pressure on the battery 5. By reducing the output current of the charging pile 4, overload damage to the battery 5 can be effectively avoided, which helps to protect the charging equipment from overload in high power or high current charging scenarios.

[0061] Reference Figure 1 In some embodiments, the controller 3 is further configured to: control the boost circuit 1 to be turned on, and before the direct connection circuit 2 is disconnected, reduce the output current of the charging pile 4 to a second preset output current. Before the boost circuit 1 is turned on and the direct connection circuit 2 is disconnected, reducing the output current can prevent the instantaneous current from being too large or fluctuating during the circuit switching process. By reducing the output current of the charging pile 4 to a preset safety value, the system impact and equipment damage caused by the sudden change of current are avoided, thereby ensuring a smooth transition of the charging process, which helps to ensure the stability and safety of the entire charging process.

[0062] Reference Figure 1 In some embodiments, the controller 3 is further configured to: when the charging pile 4 does not include an insulation detection function, control the boost circuit 1 to be turned on and control the direct connection circuit 2 to be disconnected. When the charging pile 4 includes an insulation detection function and the charging pile 4 meets the conditions for direct charging, control the direct connection circuit 2 to be turned on and control the boost circuit 1 to be disconnected. When the charging pile 4 includes an insulation detection function and the charging pile 4 does not meet the conditions for direct charging, control the direct connection circuit 2 to be disconnected and control the boost circuit 1 to be turned on. The condition for direct charging is that the difference between the output voltage of the charging pile 4 obtained by insulation detection and the required voltage of the battery 5 is greater than or equal to the first threshold.

[0063] When the charging pile 4 has an insulation detection function, it can be judged whether the output of the charging pile 4 needs to be boosted by the voltage detection voltage output by the charging pile 4 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 by the insulation detection and the required voltage of the battery 5 is greater than or equal to the first threshold, 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 controls the boost circuit 1 to be disconnected, which is more suitable for the actual charging scene, avoids unnecessary energy loss of electronic components in the boost circuit, and the entire charging process is more efficient.

[0064] By judging whether the charging pile 4 has an insulation detection function and whether the insulation detection voltage meets the direct charging condition, the controller can flexibly choose whether to use 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 and greatly enhances the compatibility with different charging piles 4.

[0065] For charging pile 4 without insulation detection function, controller 3 will select boost circuit 1 for charging, thereby avoiding potential danger caused by voltage mismatch between charging pile 4 and battery 5. By using boost circuit 1, voltage adjustment during charging is ensured to be more stable, reducing safety hazards. In the case of insulation detection function and direct charging conditions are met, direct connection circuit 2 is used for charging directly, which increases the charging speed.

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

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

[0068] In some embodiments, Figure 3 As shown, the bridge arm circuit 11 includes a first switch tube 111, a second switch tube 112, a third switch tube 113, a second switch tube 114, a fifth switch tube 115 and a sixth switch tube 116. The first electrode of the first switch tube 111 is connected to the first output end of the bridge arm circuit 11, the second electrode of the first switch tube 111 is connected to the first electrode of the second switch tube 112, and the second electrode of the second switch tube 112 is connected to the second output end of the bridge arm circuit 11. The first electrode of the third switch tube 113 is connected to the first output end of the bridge arm circuit 11, the second electrode of the third switch tube 113 is connected to the first electrode of the second switch tube 114, and the second electrode of the second switch tube 14 is connected to the second output end of the bridge arm circuit 11. The first electrode of the fifth switch tube 115 is connected to the first output end of the bridge arm circuit 11, the second electrode of the fifth switch tube 115 is connected to the first electrode of the sixth switch tube 116, and the second electrode of the sixth switch tube 116 is connected to the second output end of the bridge arm circuit 11.

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

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

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

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

[0073] As a possible implementation, Figure 3As shown, the first output end of the direct connection circuit is configured to be connected to the positive electrode of the battery, and the second output end of the direct connection circuit is connected to the 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 21, the first end of the second switch 21 is connected to the first input end of the direct connection circuit, and the second end of the second switch 21 is connected to the first output end of the direct connection circuit. The second switch 21 also includes a control end, and the controller is connected to the control end of the second switch.

[0074] Reference Figure 3 When the charging path between the battery 5 and the charging pile 4 is carried out through the boost circuit, the controller 3 controls the first switch 131 to close and controls the second switch 21 to open. The electrical signal output by the charging pile 4 is transmitted to the bridge arm circuit 11 through the motor circuit 12. The controller 3 controls the third pole of the switch tube so that 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 are turned on in a certain time sequence 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 turn on, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to turn off, so that the energy stored in the boost capacitor 132 is released, thereby achieving the voltage input to the battery 5 to be increased.

[0075] As charging continues, the output voltage of the charging pile 4 also continues to rise. When the output voltage of the charging pile 4 is close to the required voltage of the battery 5, the controller 3 controls the second switch 21 to close, controls the first switch 131 to open, 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 close. The charging pile 4 is directly connected to the battery 5.

[0076] The present application also provides a control method for a charging circuit, which is applied to the charging circuit as described above, and can be specifically applied to a controller of the charging circuit. Figure 4 As shown, the control method of the charging circuit includes:

[0077] S11: When the boost circuit is turned on, determine whether the charging pile meets the conditions for switching to direct charging.

[0078] If so, the direct connection circuit is controlled to be turned on, and the boost circuit is controlled to be 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.

[0079] S12: When the direct connection circuit is turned on and a switching signal is received, the boost circuit is controlled to be turned on and the direct connection circuit is controlled to be disconnected, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

[0080] Among them, the condition for switching to direct charging is: the output voltage of the charging pile is raised to the required voltage of the battery.

[0081] Reference Figure 3 , when 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 third pole of the switch tube so that 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 are turned on in a certain time sequence, 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 turn on, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to turn off, so that the energy stored in the boost capacitor 132 is released, thereby achieving the voltage input to the battery 5 to be increased.

[0082] When the output voltage of the charging pile 4 rises to the required voltage of the battery 5, the controller 3 controls the second switch 21 to close, controls the first switch 131 to open, 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 close, so that the charging path between the battery 5 and the charging pile 4 is converted from a boost circuit to a direct connection circuit.

[0083] When the output voltage of the charging pile 4 is not raised to the required voltage of the battery 5, the controller 3 still controls the second switch 21 to remain in the open state, and the first switch 131 to remain in the closed state. The controller 3 controls the third pole of the switch tube so that 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 are turned on in a certain time sequence, 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 turn on, and the second switch tube 112, the fourth switch tube 114 and the sixth switch tube 116 to turn off, so that the energy stored in the boost capacitor 132 is released.

[0084] When the charging pile 4 meets the switching conditions for direct charging, the controller 3 converts the charging path between the battery 5 and the charging pile 4 from a boost circuit to a direct circuit, and no longer relies on the boost circuit for charging. This intelligent switching avoids the energy loss caused 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 switching tube in the bridge arm circuit 11, thereby improving the charging efficiency, accelerating the charging speed, and meeting the user's demand for fast charging.

[0085] Furthermore, before switching the charging path, the controller 3 will determine whether the switching conditions are met. This pre-judgment mechanism ensures that the current and voltage during the charging process 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 when a direct connection circuit is used as the charging path between the battery and the charging pile is higher than when a boost circuit is used as the charging path between the battery and the charging pile, the charging path is switched only when the controller receives a switching signal to control the boost circuit to be turned on and the direct connection circuit to be disconnected.

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

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

[0089] For example, refer to Figure 4 , 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:

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

[0091] For example, refer to Figure 4 , before controlling the direct connection circuit to be turned on and controlling the boost circuit to be turned off, the control method further includes:

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

[0093] Reference Figure 1During the charging process, switching directly from the boost circuit 1 to the direct connection circuit 2 may cause a sudden change in current, which may cause a shock to the system. The controller 3 reduces the output current of the charging pile 4 to the first preset output current to ensure a smooth transition of the current. This pre-current regulation reduces the instantaneous current fluctuation during switching, avoids possible overcurrent or electrical shock, and thus improves the safety and stability of the system.

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

[0095] Check whether the charging station has an insulation detection function.

[0096] If yes, it is determined whether the charging pile meets the direct charging conditions. If yes, the direct connection circuit is controlled to be turned on and the boost circuit is controlled to be turned off. If no, the direct connection circuit is controlled to be turned off and the boost circuit is controlled to be turned on.

[0097] If not, the boost circuit is controlled to be turned on and the direct connection circuit is disconnected. The condition for direct connection charging is that the difference between the output voltage of the charging pile obtained by insulation detection and the required voltage of the battery is greater than or equal to the first threshold.

[0098] Reference Figure 1 When the charging pile 4 has an insulation detection function, it can be judged whether the output of the charging pile 4 needs to be boosted by the voltage boost circuit 1 to match the charging of the battery 5 according to the insulation detection voltage output by the charging pile 4. 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 by the insulation detection and the required voltage of the battery 5 is greater than or equal to the first threshold, 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 controls the voltage boost circuit 1 to be disconnected, which is more suitable for the actual charging scene, avoids unnecessary energy loss of electronic components in the voltage boost circuit, and makes the whole charging process more efficient.

[0099] In some embodiments, before the boost circuit or the direct-connect circuit is turned on, the control method further includes: confirming whether to enter the charging state and setting the charging termination condition. Confirmation of the charging state can prevent the battery from being overcharged or mischarged. The charging condition can be set to the battery being fully charged, or it can be set to the battery power being greater than a certain power threshold. In scenarios where charging time is tight, it is more appropriate to use the battery power being greater than a certain power threshold as the charging termination condition, which can save time on the basis of the battery meeting the basic power supply drive. Setting the charging termination condition can be freely set according to the actual application scenario, which greatly enhances the flexibility of use.

[0100] The present application provides a vehicle-mounted integrated power supply, exemplarily, as Figure 5The vehicle-mounted inherited power supply 60 comprises a battery 5 and a charging circuit 50 as described above, and the battery 5 is connected to the charging circuit 50 .

[0101] Integrating the battery 5 and the charging circuit 50 into an integrated system, namely the vehicle-mounted inherited power supply 60, reduces the space occupancy rate, helps save the physical space of the vehicle, and reduces the complexity of vehicle manufacturing. Since the charging circuit 50 provided in the present application can be switched intelligently (the charging path between the battery 5 and the charging pile is switched from a direct connection circuit to a boost circuit or from a boost circuit to a direct connection circuit), it can ensure that energy loss is minimized during charging, optimize the charging efficiency of the battery, and reduce the overheating or overvoltage phenomenon of the battery caused by unnecessary energy loss, thereby extending the service life of the battery.

[0102] The present application provides a vehicle, exemplarily, as Figure 6 The vehicle 100 comprises a battery 5 and a charging circuit 50 as described above, and the battery 5 is connected to the charging circuit 50 .

[0103] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0104] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A charging circuit, characterized in that: The charging circuit includes a boost circuit, a direct connection circuit and a controller; The input end of the boost circuit is configured to be connected to a charging pile, the output end of the boost circuit is configured to be connected to a battery, the input end of the direct connection circuit is configured to be connected to a charging pile, and the output end of the direct connection circuit is configured to be connected to a 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 further 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 connection circuit to be turned on, control the boost circuit to be 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; or; When the direct connection circuit is turned on and a switching signal is received, the boost circuit is controlled to be turned on and then the direct connection circuit is controlled to be disconnected, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

2. The charging circuit according to claim 1, characterized in that: in, The condition for switching to direct charging is that the output voltage of the charging pile is raised to the required voltage of the battery within a first preset time.

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

4. The charging circuit according to claim 1, characterized in that: 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 controlling the boost circuit to be turned off.

5. The charging circuit according to claim 1, characterized in that: The controller is further configured to: control the boost circuit to be turned on, and before controlling the direct connection circuit to be disconnected, reduce the output current of the charging pile to a second preset output current.

6. The charging circuit according to any one of claims 1 to 5, characterized in that: The controller is also configured to: When the charging pile does not include an insulation detection function, controlling the boost circuit to be turned on and controlling the direct connection circuit to be turned off; When the charging pile includes an insulation detection function and the charging pile meets the direct charging condition, the direct connection circuit is controlled to be turned on and the boost circuit is controlled to be turned off; when the charging pile includes an insulation detection function and the charging pile does not meet the direct charging condition, 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 by insulation detection and the required voltage of the battery is greater than or equal to a first threshold.

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

8. The charging circuit according to claim 7, characterized in that: The first input end of the first switch circuit is connected to the first input end of the boost circuit, and the second input end of the first switch circuit is connected to the second input end of the boost circuit; the first output end of the first switch circuit is connected to the input end of the motor circuit, the output end of the motor circuit is connected to the input end of the bridge arm circuit, the first output end of the bridge arm circuit is connected to the first output end of the boost circuit, and the second output end of the bridge arm circuit is connected to the second output end of the boost circuit; the second input end of the first switch circuit is also connected to the second output end of the boost circuit; The controller is connected to the bridge arm circuit, and the controller is also connected to the first switch circuit.

9. The charging circuit according to claim 8, characterized in that: The bridge arm circuit includes a first switch tube, a second switch tube, a third switch tube, a second switch tube, a fifth switch tube and a sixth switch tube; The first electrode of the first switch tube is connected to the first output end of the bridge arm circuit, the second electrode of the first switch tube is connected to the first electrode of the second switch tube, and the second electrode of the second switch tube is connected to the second output end of the bridge arm circuit; The first electrode of the third switch tube is connected to the first output end of the bridge arm circuit, the second electrode of the third switch tube is connected to the first electrode of the second switch tube, and the second electrode of the second switch tube is connected to the second output end of the bridge arm circuit; The first electrode of the fifth switch tube is connected to the first output end of the bridge arm circuit, the second electrode of the fifth switch tube is connected to the first electrode of the sixth switch tube, and the second electrode of the sixth switch tube is connected to the second output end of the bridge arm circuit; A diode is connected between the first pole and the second pole of each switch tube, the positive pole of the diode is connected to the second pole of the connected switch tube, and the negative pole of the diode is connected to the first pole of the connected switch tube; The controller is connected to the third pole of the first switch tube, the controller is connected to the third pole of the second switch tube, the controller is connected to the third pole of the third switch tube, the controller is connected to the third pole of the second switch tube, the controller is connected to the third pole of the fifth switch tube, and the controller is connected to the third pole of the sixth switch tube.

10. The charging circuit according to claim 8, 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 end of the motor circuit, the second end of the first winding is connected to the first pole of the fifth switching tube, the first end of the second winding is connected to the input end of the motor circuit, the second end of the second winding is connected to the first pole of the third switching tube, the first end of the third winding is connected to the input end of the motor circuit, and the second end of the third winding is connected to the first pole of the first switching tube.

11. The charging circuit according to claim 8, characterized in that: The first switch circuit includes a first switch and a boost capacitor; a first end of the first switch is connected to a first input end of the boost circuit, and a second end of the first switch is connected to an input end of the motor circuit; The first end of the boost capacitor is connected to the first input end of the boost circuit, and the 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.

12. The charging circuit according to claim 1, characterized in that: The first output end of the direct connection circuit is configured to be connected to the positive electrode of the battery, and the second output end of the direct connection circuit is connected to the 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 a first input end of the direct-connection circuit, and a second end of the second switch is connected to a 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.

13. A control method for a charging circuit, applied to the charging circuit as claimed in any one of claims 1 to 12, characterized in that: The method comprises: When the boost circuit is turned on, determining whether the charging pile meets the conditions for switching to direct charging; If so, after controlling the direct connection circuit to be turned on, controlling the boost circuit to be 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 controlled to be turned on and then the direct connection circuit is controlled to be disconnected, so that the charging pile switches from charging the battery through the direct connection circuit to charging the battery through the boost circuit.

14. The control method according to claim 13, 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 to increase the output voltage of the charging pile.

15. The control method according to claim 13, characterized in that: Before controlling the direct connection circuit to be turned on and controlling 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.

16. The control method according to claim 13, characterized in that: Before controlling the boost circuit to be turned on and controlling 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.

17. The control method according to any one of claims 13 to 16, characterized in that: The control method further includes: confirming whether the charging pile includes an insulation detection function, If yes, it is determined whether the charging pile meets the conditions for direct charging. If so, controlling the direct connection circuit to be turned on and controlling the boost circuit to be turned off; If not, the direct connection circuit is controlled to be disconnected, and the boost circuit is controlled to be turned on; If not, controlling the boost circuit to be turned on and the direct connection circuit to be turned off; The condition for direct charging is that the difference between the output voltage of the charging pile obtained by insulation detection and the required voltage of the battery is greater than or equal to a first threshold.

18. The control method according to claim 17, characterized in that: Before the boost circuit or the direct connection circuit is turned on, the control method further includes: Confirm whether to enter the charging state and set the charging end condition.

19. A vehicle-mounted integrated power supply, characterized in that: The invention comprises a charging circuit as claimed in any one of claims 1 to 12, and a battery connected to the charging circuit.

20. A vehicle, characterized in that: The invention comprises a battery and a charging circuit according to any one of claims 1 to 12, wherein the battery is connected to the charging circuit.

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