Terminal equipment, charging management circuit thereof and power adapter

Abstract

The utility model discloses a terminal device and a charging management circuit thereof, and a power adapter, the charging management circuit comprises a charging starting circuit, the charging starting circuit is respectively connected with a charging interface and a first end of a communication module, the charging interface is suitable for being connected with a charging power supply, and the communication module is suitable for being connected with the charging power supply; the charging starting circuit is configured to generate a charging starting signal based on a first voltage of the charging interface, so that the communication module performs charging initialization based on the charging starting signal and generates a charging initialization completion signal; and the charging locking circuit is respectively connected with the second end of the communication module and the charging starting circuit, and the charging locking circuit is configured to control the charging starting circuit to stop generating the charging starting signal based on the charging initialization completion signal, so that the communication module controls the terminal equipment to charge. According to the charging management circuit, the terminal equipment can support quick plugging of the charging power supply, so that the convenience of the terminal equipment is improved.

Description

Technical Field

[0001] The utility model relates to the field of charging management, in particular to a terminal device and a charging management circuit and a power adapter thereof. Background Art

[0002] In terminal devices, the communication module is one of the commonly used modules and is widely used in handheld rechargeable devices. At the same time, in order to reduce the cost of the application processor, some terminal devices will use the application core of the communication module as the main processor, such as terminal devices that support POC (PTT Over Cellular, wireless one-touch communication), POS (Point Of Sale, sales terminal), cloud speakers and other services. However, since the communication module is usually not equipped with a built-in charging circuit, the charging function is not perfect enough, and it is impossible to trigger charging initialization operations such as inserting the adapter to turn on by itself. In this regard, the terminal equipment in the current related technology usually sets an RC delay circuit on the periphery of the communication module, and triggers the insertion of the adapter to turn on by charging the capacitor to a preset level generated by a preset threshold, thereby improving the charging function of the terminal device. However, since the capacitor cannot be discharged quickly, and when the capacitor is not discharged to the preset threshold, the communication module cannot trigger the unplugging adapter shutdown function again. Therefore, the related technology cannot support the quick plug-in and unplug function of the external power supply, which makes the convenience of the terminal device relatively low. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the utility model is to propose a charging management circuit of a terminal device, which generates a charging start signal based on the first voltage of the charging interface through an internally arranged charging start circuit, so that the communication module performs charging initialization and generates a charging initialization completion signal, and then controls the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal through a charging lock circuit, so that the communication module controls the terminal device to charge, thereby enabling the terminal device to support the fast plugging and unplugging of the charging power supply, thereby improving the convenience of the terminal device.

[0004] The second objective of the present invention is to provide a terminal device.

[0005] The third objective of the present utility model is to provide a power adapter for a terminal device.

[0006] To achieve the above-mentioned purpose, the first aspect of the utility model embodiment proposes a charging management circuit of a terminal device, the terminal device includes a communication module, and the charging management circuit includes: a charging start circuit, the charging start circuit is respectively connected to the first end of the charging interface and the communication module, the charging interface is suitable for being connected to a charging power supply, and the charging start circuit is configured to generate a charging start signal based on the first voltage of the charging interface, so that the communication module performs charging initialization based on the charging start signal and generates a charging initialization completion signal; a charging lock circuit, the charging lock circuit is respectively connected to the second end of the communication module and the charging start circuit, and the charging lock circuit is configured to control the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module controls the terminal device to charge.

[0007] According to the charging management circuit of the embodiment of the utility model, a charging start circuit is internally arranged to generate a charging start signal based on the first voltage of the charging interface, so that the communication module performs charging initialization and generates a charging initialization completion signal. Then, the charging lock circuit controls the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module controls the terminal device to charge, thereby enabling the terminal device to support quick plugging and unplugging of the charging power supply, thereby improving the convenience of the terminal device.

[0008] According to one embodiment of the utility model, the charging start circuit includes: a first resistor, one end of the first resistor is connected to the charging interface; a first switch tube, the first end of the first switch tube is connected to the other end of the first resistor, and the second end of the first switch tube is grounded; a second resistor, one end of the second resistor is connected to a DC power supply, and the other end of the second resistor is respectively connected to the third end of the first switch tube and the first end of the communication module.

[0009] According to one embodiment of the utility model, the charging lock circuit includes: a second switch tube, the first end of the second switch tube is connected to the second end of the communication module, the second end of the second switch tube is respectively connected to the other end of the first resistor and the first end of the first switch tube, and the third end of the second switch tube is grounded.

[0010] According to an embodiment of the present utility model, the charging lock circuit further includes: a third resistor, one end of the third resistor is connected to the first end of the second switch tube, and the other end of the third resistor is grounded.

[0011] According to an embodiment of the present invention, the first switch tube and the second switch tube are both MOS tubes or IGBTs.

[0012] According to one embodiment of the utility model, the charging management circuit also includes: a charging stop circuit, which is respectively connected to the charging interface, the charging start circuit and the third end of the communication module, and the charging stop circuit is configured to generate a charging stop signal based on the second voltage of the charging interface, so that the communication module controls the terminal device to stop charging based on the charging stop signal.

[0013] According to one embodiment of the utility model, the charging stop circuit includes: a fourth resistor, one end of the fourth resistor is connected to the charging interface; a fifth resistor, one end of the fifth resistor is respectively connected to the other end of the fourth resistor, the charging start circuit and the third end of the communication module, and the other end of the fifth resistor is grounded.

[0014] According to an embodiment of the present utility model, the terminal device also includes a display module, and the communication module is further used to control the display module to display a charging initialization interface, a charging interface and a charging stop interface.

[0015] In order to achieve the above-mentioned purpose, a second aspect of the present invention proposes a terminal device, including a communication module and the aforementioned charging management circuit.

[0016] According to the terminal device of the embodiment of the utility model, through the internal communication module and the aforementioned charging management circuit, it is possible to support the quick plugging and unplugging of the charging power source, thereby improving the convenience of the terminal device.

[0017] To achieve the above-mentioned purpose, a third aspect of the present invention provides a power adapter for a terminal device, comprising a charging power supply and the aforementioned charging management circuit.

[0018] According to the power adapter of the embodiment of the utility model, through the internal charging power supply and the aforementioned charging management circuit, it is possible to realize fast plug-in and pull-out charging of the terminal device, thereby improving the convenience of the power adapter.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a charging management circuit of a terminal device according to an embodiment of the utility model;

[0021] Figure 2 is an initialization timing diagram of a charging management circuit according to an embodiment of the utility model;

[0022] Figure 3 A circuit diagram of a charging management circuit of a terminal device according to an embodiment of the utility model;

[0023] Figure 4 is a circuit diagram of a charging management circuit of a terminal device according to another embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the structure of a terminal device according to an embodiment of the utility model;

[0025] Figure 6 The figure is a schematic diagram of the structure of a power adapter of a terminal device according to an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] It should be noted that the charging management circuit of the utility model can be applied to a variety of terminal devices. Figure 1 The terminal device shown illustrates the charging management circuit of the present utility model. Figure 1 As shown, the terminal device 100 includes a communication module 110 .

[0028] The terminal device and its charging management circuit and power adapter proposed in the embodiments of the present utility model are described below with reference to the accompanying drawings.

[0029] Figure 1 FIG. 1 is a schematic diagram of a charging management circuit of a terminal device according to an embodiment of the present invention. Figure 1 As shown, the terminal device 100 includes a communication module 110 , and the charging management circuit 200 includes: a charging start circuit 210 and a charging lock circuit 230 .

[0030] Among them, the charging start circuit 210 is respectively connected to the charging interface 220 and the first end Powerkey of the communication module 110, the charging interface 220 is suitable for being connected to the charging power supply 300, and the charging start circuit 210 is configured to generate a charging start signal based on the first voltage of the charging interface 220, so that the communication module 110 performs charging initialization based on the charging start signal and generates a charging initialization completion signal; the charging lock circuit 230 is respectively connected to the second end STATUS of the communication module 110 and the charging start circuit 210, and the charging lock circuit 230 is configured to control the charging start circuit 210 to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module 110 controls the terminal device 100 to charge.

[0031] Specifically, the communication module 110 can trigger charging initialization operations such as power on and off through the first-end Powerkey. For example, the communication module 110 can trigger the charging initialization process when the first-end Powerkey obtains a low-level signal. In some embodiments, the communication module 110 can trigger the restart process when the first-end Powerkey obtains a long-term low-level signal to improve the reliability of the communication module 110. Therefore, when the terminal device 100 needs to control the charging initialization operation through the communication module 110, it is usually necessary to set a peripheral circuit to output a low-level signal of a preset time to the communication module 110 to ensure that the communication module 110 can accurately trigger the charging initialization and avoid the communication module 110 from restarting. For example, the RC delay circuit in the related art realizes the function of outputting a low-level signal of a preset time to the communication module 110 by slowly charging the capacitor in the delay circuit. However, in the related art, when the charging power source 300 is disconnected from the terminal device 100, the capacitor needs to be discharged for a period of time before the slow charging function can be restored. During the discharge time of the capacitor, the RC delay circuit cannot control the communication module 110 to trigger the charging initialization again. Therefore, the terminal device 100 in the related art has the defect of not being able to support the fast plug-in function of the charging power source. If a capacitor fast discharge loop is added to the RC delay circuit to overcome this defect, the hardware cost of the RC delay circuit will increase, thereby reducing the cost performance of the terminal device 100.

[0032] In the present utility model embodiment, reference Figure 2 As shown, at time T1, the charging interface 220 is connected to the charging power supply 300, and the first voltage input by the charging power supply 300 is transmitted to the charging start circuit 210 through the charging interface 220. Then, the charging start circuit 210 generates a charging start signal based on the first voltage and transmits it to the first end Powerkey of the communication module 110; the communication module 110 performs charging initialization after obtaining the charging start signal, wherein, Figure 2As shown, the charging start signal can be a low-level signal, and the charging initialization can include controlling the terminal device 100 to start up, generating a charging UI, and other operations, which are not limited here. At time T2, the charging initialization of the communication module 110 is completed. At this time, the communication module 110 generates a charging initialization completion signal and transmits it to the charging lock circuit 230 through the second terminal STATUS, wherein the charging initialization completion signal can be a high level, and the charging lock circuit 230 can control the charging start circuit 210 to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module 110 controls the terminal device 100 to charge. As a result, the charging management circuit 200 realizes the function of controlling the communication module 110 to perform charging initialization based on the first voltage of the charging interface 220, thereby improving the charging function of the communication module 110. At the same time, compared with the method of setting an RC delay circuit on the periphery of the communication module 110 to improve the charging function in the related art, the generation and stop of the charging start signal of the charging management circuit 200 of the embodiment of the utility model does not rely on the charging delay of the capacitor, and after the charging initialization of the communication module 110 is completed, the charging management circuit 200 can stop generating the charging start signal, which will not affect the generation of the next charging start signal. Therefore, the charging management circuit 200 of the embodiment of the utility model can support the quick plugging and unplugging of the charging power supply 300, thereby overcoming the defects of the related technology and improving the convenience of the terminal device 100.

[0033] In the above embodiment, an internally arranged charging start circuit generates a charging start signal based on the first voltage of the charging interface, so that the communication module performs charging initialization and generates a charging initialization completion signal. Then, the charging lock circuit controls the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module controls the terminal device to charge, thereby enabling the terminal device to support quick plugging and unplugging of the charging power supply, thereby improving the convenience of the terminal device.

[0034] In some embodiments, reference Figure 3 As shown, the charging start circuit 210 includes: a first resistor R1, a first switch tube Q1 and a second resistor R2. Among them, one end of the first resistor R1 is connected to the charging interface 220; the first end of the first switch tube Q1 is connected to the other end of the first resistor R1, and the second end of the first switch tube Q1 is grounded GND; one end of the second resistor R2 is connected to the DC power supply VDD, and the other end of the second resistor R2 is respectively connected to the third end of the first switch tube Q1 and the first end of the communication module 110.

[0035] Furthermore, the charging lock circuit 230 includes: a second switch tube Q2, a first end of the second switch tube Q2 is connected to the second end STATUS of the communication module 110, a second end of the second switch tube Q2 is respectively connected to the other end of the first resistor R1 and the first end of the first switch tube Q1, and a third end of the second switch tube Q2 is grounded GND.

[0036] Specifically, the first switch tube Q1 and the second switch tube Q2 can be switch devices such as MOS tubes and IGBT tubes. Figure 3 As shown, the first switch tube Q1 and the second switch tube Q2 are both NMOS tubes. At this time, the first ends of the first switch tube Q1 and the second switch tube Q2 are both gates. Figure 2 As shown, before time T1, the charging interface 220 is not connected to the charging power supply 300, and the first end Powerkey of the communication module 110 is connected to the DC power supply VDD through the second resistor R2 to maintain a high level. At time T1, the charging interface 220 is connected to the charging power supply 300, and the first voltage of the charging interface 220 is provided to the gate of the first switch tube Q1 through the first resistor R1 to turn on the first switch tube Q1. At this time, the first end Powerkey of the communication module 110 is grounded to GND through the first switch tube Q1, and the first end Powerkey becomes a low level. After receiving the low level and continuing for the first preset time, the communication module 110 can start charging initialization, wherein the first preset time may be the internal preset time of the communication module 110, such as 0.5 seconds, etc., which is not limited here. The charging initialization process of the communication module 110 usually lasts about 2 seconds. When the charging initialization is completed, that is, Figure 2 At the time T2 shown, the communication module 110 can output a high level to the gate of the second switch tube Q2 through the second terminal STATUS, so that the second switch tube Q2 is turned on, and then the gate of the first switch tube Q1 is grounded GND, the first switch tube Q1 is turned off, and the first terminal Powerkey of the communication module 110 becomes high again, so that the communication module 110 triggers the charging initialization process again after the charging power supply 300 is disconnected; at the same time, it also avoids the first terminal Powerkey being pulled low for a long time, so that the communication module 110 will not restart due to a long low level. In this way, the charging management circuit 200 realizes the function of controlling the communication module to perform charging initialization based on the first voltage of the charging power supply 300. At the same time, the first resistor R1 has a current limiting function to avoid excessive gate current of the first switch tube Q1, and the first resistor R1 also has a voltage isolation function to avoid the voltage of the charging interface 220 being pulled low when the second switch tube Q2 is turned on, thereby improving the stability of the charging management circuit 200. In addition, compared with the related art method of realizing quick plugging and unplugging of the charging power supply 300 by combining an RC delay circuit with a capacitor discharge circuit, the charging management circuit 200 of the embodiment of the utility model has a simpler structure and lower hardware cost, and therefore has a higher cost performance.

[0037] For further reference, Figure 4 As shown, the charging lock circuit 230 further includes: a third resistor R3, one end of the third resistor R3 is connected to the first end of the second switch tube Q2, and the other end of the third resistor R3 is grounded GND.

[0038] Specifically, the third resistor R3 is mainly used to ensure that there is enough voltage between the first end and the third end of the second switch tube Q2 to ensure that the second switch tube Q2 can be stably turned on, thereby improving the reliability of the charge locking circuit 230.

[0039] In some embodiments, reference Figure 4 As shown, the charging management circuit 200 also includes: a charging stop circuit 240, which is respectively connected to the charging interface 220, the charging start circuit 210 and the third terminal INT of the communication module 110, and the charging stop circuit 240 is configured to generate a charging stop signal based on the second voltage of the charging interface 220, so that the communication module 110 controls the terminal device 100 to stop charging based on the charging stop signal.

[0040] Specifically, the second voltage may be the voltage at the charging interface 220 when the charging interface 220 is disconnected from the charging power source 300. For example, the second voltage may be 0. Figure 2 As shown, at time T3, when the charging stop circuit 240 receives the second voltage of the charging power supply 300 through the charging interface 220, the charging stop circuit 240 can generate a charging stop signal and output it to the third terminal INT of the communication module 110, so that the communication module 110 controls the terminal device 100 to stop charging based on the charging stop signal, and triggers the corresponding stop charging process, such as controlling the terminal device 100 to shut down, generating a stop charging UI, etc., thereby further improving the charging function of the communication module, wherein the charging stop signal can be a low level, the third terminal INT can be a GPIO (General Purpose Input / Output, general input and output) port, etc., and the corresponding port can be set as the third terminal according to actual needs, and the corresponding second voltage can be set according to the port voltage requirement, and there is no specific limitation here.

[0041] Furthermore, the charging stop circuit 240 includes: a fourth resistor R4, one end of the fourth resistor R4 is connected to the charging interface 220; a fifth resistor R5, one end of the fifth resistor R5 is respectively connected to the other end of the fourth resistor R4, the charging start circuit 210 and the third end of the communication module 110, and the other end of the fifth resistor R5 is grounded GND.

[0042] Specifically, refer to Figure 4As shown, the fourth resistor R4 can be grounded through the fifth resistor R5 to form a voltage divider circuit. At the same time, when the second switch tube Q2 is closed, the fourth resistor R4 can also be grounded through the first resistor R1 to form a voltage divider circuit. Therefore, when the charging interface 220 is disconnected from the charging power source 300, the second voltage of the charging interface 220 can be divided by the voltage divider circuit composed of the fourth resistor R4, the fifth resistor R5 and the first resistor R1 and then transmitted to the third terminal INT, so that the communication module 110 receives a low-level signal as a charging stop signal, thereby controlling the terminal device 100 to stop charging based on the charging stop signal. At the same time, refer to Figure 3 As shown, when the charging interface 220 is connected to the charging power source 300, the voltage divider circuit formed by the fourth resistor R4 and the fifth resistor R5 can divide the input voltage of the charging power source 300 to generate a suitable first voltage to the charging start circuit 210. The voltage value of the first voltage can be adjusted by adjusting the resistance values ​​of the fourth resistor R4 and the fifth resistor R5, thereby reducing the difficulty of debugging the charging management circuit 200. In addition, the fourth resistor R4 also has a current limiting function, which will not be expanded here.

[0043] Optionally, refer to Figure 4 As shown, the terminal device 100 also includes a display module 120, and the communication module 110 is also used to control the display module 120 to display a charging initialization interface, a charging interface, and a charging stop interface.

[0044] Specifically, when the communication module 110 receives a charging start signal, the communication module 110 can control the display module 120 to display a charging initialization interface and a charging interface to prompt the user terminal device 100 to start charging; when the communication module 110 receives a charging stop signal, the communication module 110 can control the display module 120 to display a charging stop interface to prompt the user terminal device 100 to stop charging, so that the user can intuitively understand the charging status of the terminal device, thereby improving the convenience of the terminal device.

[0045] To summarize, according to the charging management circuit of the embodiment of the utility model, a charging start circuit is internally arranged to generate a charging start signal based on the first voltage of the charging interface, so that the communication module performs charging initialization and generates a charging initialization completion signal, and then the charging lock circuit controls the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module controls the terminal device to charge, thereby enabling the terminal device to support fast plugging and unplugging of the charging power supply, thereby improving the convenience of the terminal device. At the same time, the charging management circuit has a simple circuit structure and a low hardware cost, thereby improving the cost performance of the charging management circuit.

[0046] Corresponding to the above embodiment, the utility model also provides a terminal device, referring to Figure 5As shown, the terminal device 1000 includes a communication module 110 and the aforementioned charging management circuit 200 .

[0047] According to the terminal device of the embodiment of the utility model, through the internal communication module and the aforementioned charging management circuit, the function of quick plugging and unplugging of the external charging power supply can be realized, and the hardware cost is not high, thereby improving the convenience and cost-effectiveness of the terminal device.

[0048] Corresponding to the above embodiment, the utility model also provides a power adapter for a terminal device, referring to Figure 6 As shown, the power adapter 2000 includes a charging power source 300 and the aforementioned charging management circuit 200 .

[0049] According to the power adapter of the embodiment of the utility model, through the internal charging power supply and the aforementioned charging management circuit, the terminal device can be quickly plugged and charged, and the hardware cost is not high, thereby improving the convenience and cost-effectiveness of the power adapter.

[0050] It should be understood that the various parts of the utility model can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] In addition, 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A charging management circuit of a terminal device, characterized in that: The terminal device includes a communication module, and the charging management circuit includes: a charging start circuit, the charging start circuit being connected to the charging interface and the first end of the communication module respectively, the charging interface being adapted to be connected to a charging power source, the charging start circuit being configured to generate a charging start signal based on a first voltage of the charging interface, so that the communication module performs charging initialization based on the charging start signal, and generates a charging initialization completion signal; A charging lock circuit, wherein the charging lock circuit is respectively connected to the second end of the communication module and the charging start circuit, and the charging lock circuit is configured to control the charging start circuit to stop generating the charging start signal based on the charging initialization completion signal, so that the communication module controls the terminal device to charge.

2. The circuit according to claim 1, characterized in that The charging start circuit comprises: a first resistor, one end of which is connected to the charging interface; A first switch tube, wherein a first end of the first switch tube is connected to the other end of the first resistor, and a second end of the first switch tube is grounded; A second resistor, one end of the second resistor is connected to a DC power supply, and the other end of the second resistor is respectively connected to the third end of the first switch tube and the first end of the communication module.

3. The circuit according to claim 2, characterized in that The charging lock circuit includes: a second switch tube, a first end of the second switch tube is connected to the second end of the communication module, a second end of the second switch tube is respectively connected to the other end of the first resistor and the first end of the first switch tube, and a third end of the second switch tube is grounded.

4. The circuit according to claim 3, characterized in that The charging lock circuit further includes: a third resistor, one end of the third resistor is connected to the first end of the second switch tube, and the other end of the third resistor is grounded.

5. The circuit according to claim 4, characterized in that The first switch tube and the second switch tube are both MOS tubes or IGBTs.

6. The circuit according to any one of claims 1 to 5, characterized in that: The charging management circuit also includes: A charging stop circuit, wherein the charging stop circuit is respectively connected to the charging interface, the charging start circuit and the third end of the communication module, and the charging stop circuit is configured to generate a charging stop signal based on the second voltage of the charging interface, so that the communication module controls the terminal device to stop charging based on the charging stop signal.

7. The circuit according to claim 6, characterized in that The charging stop circuit comprises: a fourth resistor, one end of which is connected to the charging interface; A fifth resistor, one end of the fifth resistor is respectively connected to the other end of the fourth resistor, the charging start circuit and the third end of the communication module, and the other end of the fifth resistor is grounded.

8. The circuit according to claim 6, characterized in that The terminal device also includes a display module, and the communication module is also used to control the display module to display a charging initialization interface, a charging interface and a charging stop interface.

9. A terminal device, characterized in that: It comprises a communication module and a charging management circuit according to any one of claims 1-8.

10. A power adapter for a terminal device, characterized in that: It comprises a charging power supply and a charging management circuit according to any one of claims 1-8.

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