Charging circuit and notebook computer
By designing the control module and switching transistor structure in the charging circuit, the conflict problem when multiple TYPEC interfaces are inserted at the same time is solved, achieving normal charging and avoiding damage to the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN IP3 CENTURY INTELLIGENT TECH CO LTD
- Filing Date
- 2022-09-13
- Publication Date
- 2026-05-12
AI Technical Summary
When multiple Type-C ports are plugged into the power adapter at the same time, existing devices are prone to conflicts, resulting in failure to charge or damage to the device.
Design a charging circuit including at least two charging interface modules, a path conduction module, a first control module, and a second control module. Select a target charging interface module for charging through a control signal, and use four switching transistors to realize the conduction and cutoff of power output to ensure the connection between the battery and the power output terminal.
When the adapter is plugged into multiple charging ports, it can effectively avoid conflicts, ensure that the power output terminal of each charging port module is connected to the battery, achieve normal charging, and avoid burn-out.
Smart Images
Figure CN115663934B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of charging technology, and in particular to a charging circuit and a laptop computer. Background Technology
[0002] Currently, more and more devices are equipped with multiple Type-C interfaces. However, when multiple Type-C interfaces are plugged into the corresponding power adapters at the same time, conflicts may occur, causing the devices to fail to charge or even burn out. Summary of the Invention
[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a charging circuit and a laptop computer that, when an adapter is plugged into multiple charging ports, can select one charging port module from multiple charging port modules for charging.
[0004] In a first aspect, embodiments of this application provide a charging circuit, including:
[0005] At least two charging port modules;
[0006] There are at least two path connection modules, and the number of the path connection modules is equal to the number of the charging interface modules and they correspond one-to-one.
[0007] A first control module is connected to each of the charging interface modules and is also connected to each of the path connection modules. The first control module is used to determine a target charging interface module from at least two of the charging interface modules and output a first control signal to the path connection module corresponding to the target charging interface module.
[0008] A second control module is connected to the first control module and to each of the path connection modules. The second control module is used to output a second control signal to the path connection module corresponding to the target charging interface module.
[0009] Each of the path conduction modules includes a first switch, a second switch, a third switch, and a fourth switch. The first switch is connected to the first control module and the second switch, respectively. The first switch is used to turn on or off according to the first control signal from the first control module.
[0010] The second switch is connected to the third switch, the fourth switch, and the second control module respectively. When the first switch is turned on, the second switch is used to turn on or off according to the second control signal of the second control module. When the second switch is turned on, the second switch is also used to turn on the third switch and the fourth switch.
[0011] The third switch is connected to the power output terminal of the corresponding charging interface module and the fourth switch, respectively. The third switch is used to make the power output terminal of the corresponding charging interface module and the fourth switch conduct or cut off.
[0012] The fourth switch is used to connect the battery to be charged, and the fourth switch is used to make the battery to be charged and the third switch conduct or cut off.
[0013] The charging circuit according to the embodiments of this application has at least the following beneficial effects: When at least two charging interface modules are connected to an external adapter, the first control module determines the target charging interface module from the at least two charging interface modules and outputs a first control signal to the path conduction module corresponding to the target charging interface module, thereby turning on the corresponding first switch according to the first control signal. At the same time, the second control module outputs a second control signal to the path conduction module corresponding to the target charging interface module. The first switch of the path conduction module corresponding to the target charging interface module turns on according to the first control signal, thereby turning on the corresponding second switch. When the second switch is turned on, the second switch is also used to turn on the third switch and the fourth switch, thereby making the power output terminal of the corresponding charging interface module conduct with the fourth switch, and the battery to be charged conduct with the third switch, thereby making the battery to be charged conduct with the power output terminal of the corresponding charging interface module. The power output terminal of the corresponding charging interface module can output voltage to the battery to be charged for charging.
[0014] According to some embodiments of the first aspect of this application, the gate of the first switch is connected to the first control module, the source of the first switch is grounded, and the drain of the first switch is connected to the source of the second switch.
[0015] According to some embodiments of the first aspect of this application, the gate of the second switch is connected to the second control module, and the drain of the second switch is connected to the gate of the third switch and the gate of the fourth switch, respectively.
[0016] According to some embodiments of the first aspect of this application, the drain of the third switch is connected to the power output terminal of the corresponding charging interface module, the source of the third switch is connected to the source of the fourth switch, the gate of the fourth switch is connected to the gate of the third switch, and the gate of the fourth switch and the gate of the third switch are connected to the drain of the second switch through a first resistor, the source of the third switch and the source of the fourth switch are connected to the first resistor through a second resistor, and the drain of the fourth switch is connected to the battery to be charged.
[0017] According to some embodiments of the first aspect of this application, the resistance of the first resistor is one-third of the resistance of the second resistor.
[0018] According to some embodiments of the first aspect of this application, a first capacitor is also included, and the source of the third switch and the source of the fourth switch are further connected to the first resistor through the first capacitor, and the first capacitor is connected in parallel with the second resistor.
[0019] According to some embodiments of the first aspect of this application, the gate of the first switch is connected to the first control module through a third resistor.
[0020] According to some embodiments of the first aspect of this application, the gate of the second switch is connected to the second control module through a fourth resistor.
[0021] According to some embodiments of the first aspect of this application, a second capacitor is also included, wherein the drain of the third switching transistor is grounded to the power output terminal of the corresponding charging interface module through the second capacitor.
[0022] Secondly, embodiments of this application provide a laptop computer, including:
[0023] The charging circuit described in any embodiment of the first aspect.
[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0025] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0026] Figure 1 This is a structural block diagram of the charging circuit according to an embodiment of this application;
[0027] Figure 2 This is a circuit diagram of the first control module according to an embodiment of this application;
[0028] Figure 3This is a circuit diagram of the first control module according to an embodiment of this application;
[0029] Figure 4 This is a circuit diagram of the second control module according to an embodiment of this application;
[0030] Figure 5 This is a circuit diagram of a TYPEC interface and its corresponding path connection module according to an embodiment of this application;
[0031] Figure 6 This is a circuit diagram of another TYPEC interface and its corresponding path connection module in an embodiment of this application.
[0032] Figure label:
[0033] Charging interface module 100;
[0034] Path conduction module 200; first switch 210; second switch 220; third switch 230; fourth switch 240; first resistor 250; second resistor 260; first capacitor 270; second capacitor 280; third resistor 290; fourth resistor 291;
[0035] First control module 300;
[0036] Second control module 400. Detailed Implementation
[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0038] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.
[0039] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0040] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0041] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] Firstly, referring to Figures 1 to 6 This application provides a charging circuit, including:
[0043] At least two charging port modules 100;
[0044] There are at least two path connection modules 200, and the number of path connection modules 200 is equal to that of the charging interface module 100 and they correspond one-to-one.
[0045] A first control module 300 is connected to each charging interface module 100 and also to each path connection module 200. The first control module 300 is used to determine a target charging interface module 100 from at least two charging interface modules 100 and output a first control signal to the path connection module 200 corresponding to the target charging interface module 100.
[0046] The second control module 400 is connected to the first control module 300 and to each path connection module 200. The second control module 400 is used to output a second control signal to the path connection module 200 corresponding to the target charging interface module 100.
[0047] Each path conduction module 200 includes a first switch 210, a second switch 220, a third switch 230 and a fourth switch 240. The first switch 210 is connected to the first control module 300 and the second switch 220 respectively. The first switch 210 is used to turn on or off according to the first control signal of the first control module 300.
[0048] The second switch 220 is connected to the third switch 230, the fourth switch 240, and the second control module 400 respectively. When the first switch 210 is turned on, the second switch 220 is used to turn on or off according to the second control signal of the second control module 400. When the second switch 220 is turned on, the second switch 220 is also used to turn on the third switch 230 and the fourth switch 240.
[0049] The third switch 230 is connected to the power output terminal of the corresponding charging interface module 100 and the fourth switch 240 respectively. The third switch 230 is used to make the power output terminal of the corresponding charging interface module 100 and the fourth switch 240 conduct or cut off.
[0050] The fourth switch 240 is used to connect the battery to be charged, and the fourth switch 240 is used to turn the battery to be charged and the third switch 230 on or off.
[0051] The charging circuit according to the embodiments of this application has at least the following beneficial effects: When at least two charging interface modules 100 are connected to an external adapter, the first control module 300 determines the target charging interface module 100 from the at least two charging interface modules 100 and outputs a first control signal to the path conduction module 200 corresponding to the target charging interface module 100, thereby turning on the corresponding first switch 210 according to the first control signal. At the same time, the second control module 400 outputs a second control signal to the path conduction module 200 corresponding to the target charging interface module 100; and the charging circuit according to the target charging interface module 100 has the following beneficial effects: The first switch 210 of the corresponding path conduction module 200 is turned on according to the first control signal, thereby turning on the corresponding second switch 220. When the second switch 220 is turned on, it also turns on the third switch 230 and the fourth switch 240, thereby making the power output terminal of the corresponding charging interface module 100 connected to the fourth switch 240, and the battery to be charged connected to the third switch 230, thus making the battery to be charged connected to the power output terminal of the corresponding charging interface module 100. The power output terminal of the corresponding charging interface module 100 can output voltage to the battery to be charged for charging. This avoids the situation where two or more charging interface modules 100 are plugged into the adapter, resulting in a conflict and inability to charge.
[0052] It should be noted that when the target charging interface module 100 is plugged into the adapter, it is connected to the mains power or other power source through the adapter, so that the power output terminal of the target charging interface module 100 can output voltage to the battery to be charged for charging.
[0053] It is worth noting that the charging circuit of this application embodiment can be applied to a terminal, and the electronic device is based on the ALDER LAKE processor, such as a laptop, tablet or other terminal that uses the ALDER LAKE processor, and the battery to be charged is the battery in the aforementioned terminal.
[0054] It is worth noting that the charging interface module 100 can be a TYPEC interface, a USB Micro interface, or a Lightning interface; this application does not limit this.
[0055] It should be noted that the number of charging interface modules 100 and path conduction modules 200 are equal, and there is a one-to-one correspondence between the charging interface modules 100 and the path conduction modules 200. The number of charging interface modules 100 and path conduction modules 200 can be two, three, or any other number; two or more are sufficient. Each path conduction module 200 includes a first switch 210, a second switch 220, a third switch 230, and a fourth switch 240. The path conduction modules 200 do not interfere with each other.
[0056] It is worth noting that the first control module 300 can determine the target charging interface module 100 from at least two charging interface modules 100 and output a first control signal to the path connection module 200 corresponding to the target charging interface module 100, and the second control module 400 can output a second control signal to the path connection module 200 corresponding to the target charging interface module 100. For example, the charging circuit has two charging interface modules 100, both of which are Type-C interfaces. The first control module 300 sets the priority of the two Type-C interfaces. When both Type-C interfaces are plugged into the adapter, the first control module 300 selects the Type-C interface with the higher priority as the target charging interface module 100 and sends a first control signal to the first switch 210 of the path conduction module 200 corresponding to the target charging interface module 100. The second control module 400 is connected to the first control module 300, so the second control module 400 can determine the target charging interface module 100 from the first control module 300. For example, the first control module 300 stores the relevant information of the Type-C interface with the higher priority in a register, and the second control module 400 accesses the register of the first control module 300 to determine the target charging interface module 100, and then sends a second control signal to the second switch 220 of the path conduction module 200 corresponding to the target charging interface module 100. This avoids situations where charging fails due to conflicts when all charging interface modules 100 are plugged into the adapter. It should be noted that, among at least two charging interface modules 100, those skilled in the art can set priorities according to actual needs; this application does not limit the specific priorities.
[0057] In another embodiment, when the first control module 300 detects that only one of the at least two charging interface modules 100 is connected to the adapter, the first control module 300 designates the charging interface module 100 connected to the adapter as the target charging interface module 100 and sends a first control signal to the first switch 210 of the path conduction module 200 corresponding to the target charging interface module 100. The second control module 400 is connected to the first control module 300, so the second control module 400 can determine the target charging interface module 100 from the first control module 300 and then send a second control signal to the second switch 220 of the path conduction module 200 corresponding to the target charging interface module 100.
[0058] It is understandable that the gate of the first switching transistor 210 is connected to the first control module 300, the source of the first switching transistor 210 is grounded, and the drain of the first switching transistor 210 is connected to the source of the second switching transistor 220.
[0059] It is understandable that the gate of the second switch 220 is connected to the second control module 400, and the drain of the second switch 220 is connected to the gate of the third switch 230 and the gate of the fourth switch 240, respectively.
[0060] Understandably, the drain of the third switch 230 is connected to the power output terminal of the corresponding charging interface module 100, the source of the third switch 230 is connected to the source of the fourth switch 240, the gate of the fourth switch 240 is connected to the gate of the third switch 230, and the gate of the fourth switch 240 and the gate of the third switch 230 are connected to the drain of the second switch 220 through the first resistor 250. The source of the third switch 230 and the source of the fourth switch 240 are connected to the first resistor 250 through the second resistor 260. The drain of the fourth switch 240 is connected to the battery to be charged.
[0061] It is understandable that the resistance of the first resistor 250 is one-third of the resistance of the second resistor 260. For example, the resistance of the first resistor 250 is 100kΩ, and the resistance of the second resistor 260 is 300kΩ.
[0062] It is understandable that it also includes a first capacitor 270, and the source of the third switch 230 and the source of the fourth switch 240 are connected to the first resistor 250 through the first capacitor 270, and the first capacitor 270 is connected in parallel with the second resistor 260.
[0063] It is understandable that the gate of the first switching transistor 210 is connected to the first control module 300 through the third resistor 290.
[0064] Understandably, the gate of the second switch 220 is connected to the second control module 400 through the fourth resistor 291.
[0065] It is understandable that the second capacitor 280 is also included, and the drain of the third switching transistor 230 is grounded to the power output terminal of the corresponding charging interface module 100 through the second capacitor 280.
[0066] Specifically, refer to Figures 2 to 6 This illustration shows a specific embodiment of the present application. The charging circuit includes two Type-C interfaces, namely JTYPEC_B and JTYPEC_A. The first control module 300 includes two CYPD6X27 chips; the second control module 400 uses an IT5570 LQFP chip. Figure 2 This is a schematic diagram of the circuit of the first control module 300 and some of its peripheral circuits; Figure 3 This is also a schematic diagram of the circuit and some peripheral circuits of the first control module 300 in this embodiment of the application; Figure 4This is a schematic diagram of the circuit of the second control module 400 and some of its peripheral circuits; Figure 5 A circuit diagram of a TYPEC interface and its corresponding path connection module 200; Figure 6 This is a circuit diagram of another TYPEC interface and its corresponding path connection module 200. (Refer to...) Figure 5 When the first control module 300 determines that the JTYPEC_A interface is the target charging interface module 100 according to the priority rules preset by the first control module 300, that is, it is determined that charging will be performed through the JTYPEC_A interface, and an adapter is inserted into the JTYPEC_A interface, then CC1 and CC2 communication are established between the JTYPEC_A interface and the first control module 300, which can increase the output voltage of the JTYPEC_A interface from 5V to 20V, that is, increase the voltage of VBUS_TYPEC_A from 5V to 20V. Then, the first control module 300 sends a first control signal to the gate of the first switch 210 of the corresponding path conduction module 200, and the first control signal is high level. Figure 5 In this context, the first control signal is TCPC_P0_SNK_CNTRL; the second control module 400 reads from the register of the first control module 300 that the target charging interface module 100 is a JTYPEC_A interface. Therefore, the second control module 400 sends a second control signal to the gate of the second switch 220 of the corresponding path conduction module 200, and the second control signal is high. Figure 5In this context, the second control signal is TYPEC_PWR_EN_A. Since the TCPC_P0_SNK_CNTRL signal is high, the first switch 210 is turned on. Because the source of the first switch 210 is grounded, the drain of the first switch 210 is low after it is turned on. Since the signal TYPEC_PWR_EN_A is high, the second switch 220 is turned on. The source of the second switch 220 is connected to the drain of the first switch 210. Therefore, after the second switch 220 is turned on, its drain is also low. Consequently, one end of the first resistor 250 is low. The other end of the first resistor 250, due to the voltage divider effect between the first resistor 250 and the second resistor 260 (where the first resistor 250 has a resistance of 100kΩ and the second resistor 260 has a resistance of 300kΩ, and the voltage VBUS_TYPEC_A is 20V), is low. The voltage at the other end of resistor 250 is 5V, which is the gate voltage of the third switch 230 and the gate voltage of the fourth switch 240. The source voltage of the third switch 230 is connected to VBUS_TYPEC_A, which means the VGS of the third switch 230 is -15V. Therefore, the third switch 230 is turned on. When the third switch 230 is turned on, the source voltage of the fourth switch 240 is also connected to VBUS_TYPEC_A, which means the VGS of the fourth switch 240 is also -15V. Therefore, the fourth switch 240 can be turned on, so that the battery to be charged is connected to the voltage VBUS_TYPEC_A to be charged.
[0067] Reference Figure 6 When the first control module 300 determines that the JTYPEC_B interface is the target charging interface module 100 according to the priority rules preset by the first control module 300, that is, it is determined that charging will be performed through the JTYPEC_B interface, and an adapter is inserted into the JTYPEC_B interface, then CC1 and CC2 communication are established between the JTYPEC_B interface and the first control module 300, which can increase the output voltage of the JTYPEC_B interface from 5V to 20V, that is, increase the voltage of VBUS_TYPEC_B from 5V to 20V. Then, the first control module 300 sends a first control signal to the gate of the first switch 210 of the corresponding path conduction module 200, and the first control signal is high level. Figure 6 In this context, the first control signal is TCPC_P1_SNK_CNTRL; the second control module 400 reads from the register of the first control module 300 that the target charging interface module 100 is a JTYPEC_B interface. Therefore, the second control module 400 sends a second control signal to the gate of the second switch 220 of the corresponding path conduction module 200, and the second control signal is high. Figure 6In this context, the second control signal is TYPEC_PWR_EN_B. Since the TCPC_P1_SNK_CNTRL signal is high, the first switch 210 is turned on. Because the source of the first switch 210 is grounded, the drain of the first switch 210 is low after it is turned on. Since the signal TYPEC_PWR_EN_B is high, the second switch 220 is turned on. The source of the second switch 220 is connected to the drain of the first switch 210. Therefore, after the second switch 220 is turned on, its drain is also low. Consequently, one end of the first resistor 250 is low. The other end of the first resistor 250, due to the voltage divider effect between the first resistor 250 and the second resistor 260 (where the first resistor 250 has a resistance of 100kΩ and the second resistor 260 has a resistance of 300kΩ), and the voltage VBUS_TYPEC_A is 20V, is low. The voltage at the other end of resistor 250 is 5V, which is the gate voltage of the third switch 230 and the gate voltage of the fourth switch 240. The source voltage of the third switch 230 is connected to VBUS_TYPEC_B, which means that the VGS of the third switch 230 is -15V. Therefore, the third switch 230 is turned on. When the third switch 230 is turned on, the source voltage of the fourth switch 240 is also connected to VBUS_TYPEC_B, and the VGS of the fourth switch 240 is also -15V. Therefore, the fourth switch 240 can be turned on, so that the battery to be charged is connected to the voltage VBUS_TYPEC_B to be charged.
[0068] It should be noted that CC1 and CC2 communication refers to the connection between the CC1 pin and the CC2 pin. This is a publicly available and common technology in the field of TYPEC interface charging, and this application will not elaborate on it further.
[0069] It is worth noting that the first switch 210 and the second switch 220 are low-current MOSFETs, such as the PNM723T30V01 MOSFET. The third switch 230 and the fourth switch 240, however, are high-current MOSFETs, such as the LCC8_P65MM_SQ3MM_FET MOSFET.
[0070] Secondly, embodiments of this application provide a laptop computer, including:
[0071] The charging circuit described in any embodiment of the first aspect.
[0072] Since the laptop computer includes the charging circuit described in any embodiment of the first aspect, all embodiments mentioned in the first aspect are applicable to the laptop computer and have the same effect, and will not be described again here.
[0073] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.
Claims
1. A charging circuit, characterized in that, include: At least two charging port modules; There are at least two path connection modules, and the number of the path connection modules is equal to the number of the charging interface modules and they correspond one-to-one. A first control module is connected to each of the charging interface modules and is also connected to each of the path connection modules. The first control module is used to determine a target charging interface module from at least two of the charging interface modules and output a first control signal to the path connection module corresponding to the target charging interface module. A second control module is connected to the first control module and to each of the path connection modules. The second control module is used to output a second control signal to the path connection module corresponding to the target charging interface module. Each of the path conduction modules includes a first switch, a second switch, a third switch, and a fourth switch. The first switch is connected to the first control module and the second switch, respectively. The first switch is used to turn on or off according to the first control signal from the first control module. The second switch is connected to the third switch, the fourth switch, and the second control module respectively. When the first switch is turned on, the second switch is used to turn on or off according to the second control signal of the second control module. When the second switch is turned on, the second switch is also used to turn on the third switch and the fourth switch. The third switch is connected to the power output terminal of the corresponding charging interface module and the fourth switch, respectively. The third switch is used to make the power output terminal of the corresponding charging interface module and the fourth switch conduct or cut off. The fourth switch is used to connect the battery to be charged, and the fourth switch is used to make the battery to be charged and the third switch conduct or cut off.
2. The charging circuit according to claim 1, characterized in that, The gate of the first switch is connected to the first control module, the source of the first switch is grounded, and the drain of the first switch is connected to the source of the second switch.
3. The charging circuit according to claim 2, characterized in that, The gate of the second switch is connected to the second control module, and the drain of the second switch is connected to the gate of the third switch and the gate of the fourth switch, respectively.
4. The charging circuit according to claim 3, characterized in that, The drain of the third switch is connected to the power output terminal of the corresponding charging interface module. The source of the third switch is connected to the source of the fourth switch. The gate of the fourth switch is connected to the gate of the third switch. The gate of the fourth switch and the gate of the third switch are connected to the drain of the second switch through a first resistor. The source of the third switch and the source of the fourth switch are connected to the first resistor through a second resistor. The drain of the fourth switch is connected to the battery to be charged.
5. The charging circuit according to claim 4, characterized in that, The resistance of the first resistor is one-third of the resistance of the second resistor.
6. The charging circuit according to claim 4, characterized in that, It also includes a first capacitor, and the source of the third switch and the source of the fourth switch are connected to the first resistor through the first capacitor, and the first capacitor is connected in parallel with the second resistor.
7. The charging circuit according to claim 2, characterized in that, The gate of the first switching transistor is connected to the first control module through a third resistor.
8. The charging circuit according to claim 3, characterized in that, The gate of the second switch is connected to the second control module through a fourth resistor.
9. The charging circuit according to claim 4, characterized in that, It also includes a second capacitor, through which the drain of the third switching transistor is grounded to the power output terminal of the corresponding charging interface module.
10. A laptop computer, characterized in that, include: The charging circuit according to any one of claims 1 to 9.