Charging circuit, power supply module and electronic equipment

Abstract

The utility model relates to a charging circuit, a power supply module and electronic equipment. The charging circuit comprises a power supply input end; the power supply input end charges the impedance element to improve the impedance of the impedance element; one end of the switch assembly is connected with the power input end, the other end of the switch assembly is connected with the impedance element, the switch assembly comprises a first switch and a thermosensitive element which are connected in parallel, and the switch assembly is configured in the mode that the voltage of the impedance element is larger than or equal to threshold voltage, the first switch is switched on; the power supply input end and the impedance element are conducted through the first switch; the switch assembly is configured in a way that the voltage of the impedance element is smaller than threshold voltage, the first switch is switched off, and the power input end and the impedance element are conducted through the thermosensitive element. The thermosensitive element and the first switch are arranged between the power input end of the circuit and the impedance element, the first switch is adjusted according to the voltage of the impedance element, and when the circuit works normally, the first switch can reduce the loss of the circuit.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a charging circuit, a power module and an electronic device. Background Art

[0002] With the rapid development of mobile communication technology, electronic devices such as mobile phones and tablet computers have become indispensable devices in people's daily lives. Charging circuits can convert a voltage level into the voltage or current required by electronic devices through different forms of architecture. For example, the charging circuit can be connected to an AC power supply or a DC power supply, and output the DC power required by the electronic device.

[0003] However, at the moment of starting the switching power supply, the initial voltage of the capacitor is zero and the charging impedance is very low, which causes the current of the switching power supply to rise rapidly at the moment of starting. The instantaneous current may exceed the range that the switching power supply can withstand, thereby damaging the power supply and other equipment. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a charging circuit, a power module and an electronic device.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging circuit is provided, comprising: a power input terminal; an impedance element, wherein the power input terminal charges the impedance element to increase the impedance of the impedance element; a switch component, wherein one end of the switch component is connected to the power input terminal, and the other end of the switch component is connected to the impedance element, and the switch component comprises a first switch and a thermistor connected in parallel, wherein the switch component is configured such that when the voltage of the impedance element is greater than or equal to a threshold voltage, the first switch is turned on, and the power input terminal and the impedance element are connected through the first switch; and the switch component is configured such that when the voltage of the impedance element is less than a threshold voltage, the first switch is turned off, and the power input terminal and the impedance element are connected through the thermistor.

[0006] In some embodiments, the charging circuit includes: a control element, the control element includes an input end and a first output end, the input end is used to detect the voltage of the impedance element, and the first output end is connected to the first switch; wherein, when the input end detects that the voltage of the impedance element is greater than or equal to a threshold voltage, the first output end outputs a first level signal, and the first switch is turned on; when the input end detects that the voltage of the impedance element is less than the threshold voltage, the first output end outputs a second level signal, and the first switch is turned off.

[0007] In some embodiments, the charging circuit includes a reference power supply, the voltage of the reference power supply is the threshold voltage; the input end includes a first input end and a second input end, the first input end is connected to the impedance element and obtains the voltage of the impedance element, and the second input end is connected to the reference power supply, wherein the voltage of the first input end is greater than or equal to the voltage of the second input end, and the first output end outputs the first level signal; the voltage of the first input end is less than the voltage of the second input end, and the first output end outputs the second level signal.

[0008] In some embodiments, the first switch includes a source, a drain and a gate, the source is connected to the power input terminal, the drain is connected to the impedance element, and the gate is connected to the first output terminal, wherein the input terminal detects that the voltage of the impedance element is greater than or equal to a threshold voltage, the first output terminal outputs a first level signal, the source and the drain are turned on to turn on the first switch; the input terminal detects that the voltage of the impedance element is less than the threshold voltage, the first output terminal outputs a second level signal, and the source and the drain are disconnected to turn off the first switch.

[0009] In some embodiments, the thermal element is a positive temperature coefficient thermistor.

[0010] In some embodiments, the charging circuit includes: a second switch, one end of the second switch is connected to the switch component, and the other end of the second switch is connected to the power input end, wherein the second switch is an overvoltage protection switch.

[0011] In some embodiments, the charging circuit includes: a third switch, one end of the third switch is connected to the thermistor, the other end of the third switch is connected to the impedance element, and the third switch is connected in parallel with the first switch, wherein the third switch is configured so that when the voltage of the impedance element is greater than or equal to a threshold voltage, the third switch is disconnected, and the thermistor and the impedance element are disconnected; the third switch is configured so that when the voltage of the impedance element is less than a threshold voltage, the third switch is turned on, and the power input end and the impedance element are connected through the thermistor and the third switch; the thermistor is a negative temperature coefficient thermistor.

[0012] In some embodiments, the charging circuit includes: a functional component, one end of which is connected to the switch component, the functional component includes the impedance element, and the functional component is used to monitor or change the voltage or current of the charging circuit.

[0013] In some embodiments, the functional component includes a charge pump and / or a power management module; the impedance element includes a capacitor and / or an inductor.

[0014] According to a second aspect of an embodiment of the present disclosure, there is provided a power supply module, the power supply module comprising: the charging circuit as described in any one of the first aspects.

[0015] According to a third aspect of an embodiment of the present disclosure, an electronic device is provided, comprising: the charging circuit as described in any one of the first aspect, or the power supply module as described in the second aspect.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure sets a switch component having a thermistor and a first switch between the power input terminal and the functional component of the circuit, and controls the conduction state of the first switch according to the relationship between the voltage of the impedance element and the threshold voltage, so that when the charging circuit is working normally, the first switch can reduce the loss of the circuit by short-circuiting the thermistor.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] Figure 1 The figure is a schematic diagram showing the structure of a charging circuit according to an exemplary embodiment.

[0020] Figure 2 It is a schematic diagram of the structure of a power module according to an exemplary embodiment. DETAILED DESCRIPTION

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0022] In the related art, a thermistor can be provided in the charging circuit to limit the current value at the moment of circuit startup. When the charging circuit is started, the thermistor is at room temperature and has a very high resistance, which can effectively limit the current; after the circuit is started, the thermistor will heat up rapidly due to its own heat dissipation, and the resistance value will be reduced to one tenth of the resistance value at room temperature, so that the circuit can work normally.

[0023] In order to solve the above technical problems, according to an embodiment of the present disclosure, a charging circuit is provided, the charging circuit comprising: a power input terminal; an impedance element, the power input terminal charges the impedance element to increase the impedance of the impedance element; a switch component, one end of the switch component is connected to the power input terminal, and the other end of the switch component is connected to the impedance element, the switch component comprises a first switch and a thermistor connected in parallel, wherein the switch component is configured such that when the voltage of the impedance element is greater than or equal to a threshold voltage, the first switch is turned on, and the power input terminal and the impedance element are connected through the first switch; the switch component is configured such that when the voltage of the impedance element is less than the threshold voltage, the first switch is turned off, and the power input terminal and the impedance element are connected through the thermistor.

[0024] The present invention provides a switch component having a thermistor and a first switch between a power input terminal of a circuit and a functional component, and controls the conduction state of the first switch according to the magnitude relationship between the voltage of an impedance element and a threshold voltage, so that when the charging circuit works normally, the first switch can reduce the loss of the circuit by short-circuiting the thermistor.

[0025] It can be understood that the charging circuit involved in the present disclosure can be applicable to any terminal listed below.

[0026] It is understandable that the terminal involved in the present disclosure may also be referred to as a terminal device, a user equipment (User Equipment, UE), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal, MT), etc., which is a device that provides voice and / or data connectivity to users. For example, the terminal may be a handheld device with a wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals are: a smart phone (Mobile Phone), a pocket computer (Pocket Personal Computer, PPC), a handheld computer, a personal digital assistant (Personal Digital Assistant, PDA), a laptop computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device may also be a vehicle-mounted device. It should be understood that the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal.

[0027] In some embodiments, Figure 1 As shown, the charging circuit may include: a power input terminal Vin, an impedance element and a switch component 4.

[0028] The power input terminal Vin can charge the impedance element to increase the impedance of the impedance element. Exemplarily, the impedance element can be a capacitor or an inductor.

[0029] The switch assembly 4 may include a thermistor 41 and a first switch 42 , and the thermistor 41 and the first switch 42 may be connected in parallel.

[0030] Since the initial voltage of the impedance element is zero, the charging impedance is very low, which causes the current to rise rapidly when the charging circuit is started. The large instantaneous current may exceed the range that the electronic components of the charging circuit can withstand, thereby damaging the charging circuit and other equipment.

[0031] The switch component 4 can be arranged between the power input terminal Vin and the impedance element, one end of the switch component 4 can be connected to the power input terminal Vin, and the other end of the switch component 4 can be connected to the functional component 2 .

[0032] The switch assembly 4 may include a thermistor 41 and a first switch 42 . One end of the thermistor 41 is connected to the power input terminal Vin, and the other end of the thermistor 41 is connected to the impedance element.

[0033] When the charging circuit is started, the thermistor 41 may have a relatively high resistance value so as to limit the current of the charging circuit when it is started, thereby protecting the charging circuit.

[0034] One end of the first switch 42 may be connected to the power input terminal Vin, and the other end of the first switch 42 may be connected to the impedance element.

[0035] like Figure 1 As shown, the thermistor 41 may be connected in parallel with the first switch 42 .

[0036] By limiting the current further increase through the thermistor 41, the power input terminal Vin can smoothly charge the impedance element. After the impedance element voltage is greater than or equal to the threshold voltage, the first switch 42 is turned on, and the first switch 42 can short-circuit the thermistor 41, so that the current flows to the impedance element through the first switch 42, thereby preventing the high-resistance thermistor 41 from being continuously connected to the charging circuit, thereby reducing the power consumption of the charging circuit after normal operation.

[0037] The switch component 4 can be configured so that when the voltage of the impedance element is greater than or equal to the threshold voltage, the first switch 42 is turned on, and the power input terminal Vin and the impedance element can be turned on through the first switch 42, so that the current flows to the impedance element through the first switch 42, thereby preventing the high-resistance thermistor 41 from being continuously connected to the charging circuit, thereby reducing the power consumption caused by the thermistor 41 after the charging circuit is operating normally.

[0038] When the voltage of the impedance element is less than the threshold voltage, the first switch 42 is disconnected, and the power input terminal Vin and the impedance element can be connected through the thermistor 41, so that the current flows to the impedance element through the thermistor 41, and the current at the start of the charging circuit is limited by the high-resistance thermistor 41, so that the power input terminal Vin can charge the impedance element smoothly, preventing excessive current from appearing in the charging circuit, thereby protecting the charging circuit.

[0039] The present disclosure sets a switch component 4 having a thermistor 41 and a first switch 42 between a power input terminal Vin of the circuit and an impedance element, and controls the conduction state of the first switch 42 according to the magnitude relationship between the voltage of the impedance element and the threshold voltage, so that when the charging circuit works normally, the first switch 42 can reduce the loss of the circuit by short-circuiting the thermistor 41.

[0040] In some embodiments, Figure 1 As shown, the charging circuit may include a functional component 2, and the functional component 2 may be used to detect or change the voltage or current of the charging circuit, wherein the functional component 2 may include an impedance element.

[0041] In some embodiments, Figure 1 As shown, the functional component 2 may include one or more of a charge pump 22 and a power management module 21 , and the impedance element may be a capacitor or an inductor in the functional component.

[0042] In some embodiments, Figure 1 As shown, the charging circuit may include: a control element 3, the control element 3 may include an input terminal and a first output terminal 31, the first output terminal 31 may be connected to the switch component 4, and the first output terminal 31 may output a level signal to the first switch 42 to control the conduction state of the first switch. The input terminal may be used to detect the voltage of the impedance element.

[0043] The first output terminal 31 outputs a first level signal, and the first switch 42 can be turned on, so that the first switch 42 can reduce circuit loss by short-circuiting the thermistor 41 .

[0044] The first output terminal 31 outputs a second level signal, and the first switch 42 can be disconnected, so that the thermistor 41 is connected to the circuit and limits the startup current of the charging circuit.

[0045] Exemplarily, the first level signal may be a high level signal, and the second level signal may be a low level signal.

[0046] The switch state of the first switch 42 can be controlled by the control element 3 , so that the first switch 42 can be switched between the on state and the off state under the control of the control element 3 , thereby realizing the first switch 42 controlling the flow direction of the current.

[0047] When the voltage of the input detection impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a first level signal to turn on the first switch 42 .

[0048] When the voltage of the input detection impedance element is less than the threshold voltage, the first output terminal 31 can output a second level signal to disconnect the first switch 42 .

[0049] In some embodiments, Figure 1 As shown, the charging circuit may include a reference power supply Vref, and the voltage of the reference power supply Vref may be a threshold voltage.

[0050] The control element 3 may include a first input terminal 32 and a second input terminal 33. The first input terminal 32 may be connected to the impedance element to obtain the voltage of the impedance element. Exemplarily, the first input terminal 32 may be connected to the functional component 2 to obtain the voltage of the impedance element of the functional component 2. The second input terminal 33 may be connected to a reference power supply Vref.

[0051] When the voltage of the first input terminal 32 is greater than or equal to the voltage of the second input terminal 33 , the first output terminal 31 outputs a first level signal; when the voltage of the first input terminal 32 is less than the voltage of the second input terminal 33 , the first output terminal 31 outputs a second level signal.

[0052] Exemplarily, the control element 3 may be an operational amplifier. The voltage of the first input terminal 32 is the voltage of the functional component 2, and the voltage of the second input terminal 33 is the voltage of the reference power supply Vref, ie, the threshold voltage.

[0053] When the voltage of the first input terminal 32 is greater than or equal to the voltage of the second input terminal 33, that is, the voltage of the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a first level signal, the first switch 42 can be turned on, the power input terminal Vin and the impedance element can be turned on by the first switch 42, and the current can flow to the impedance element through the first switch 42, so that the first switch 42 can reduce the loss of the circuit by short-circuiting the thermistor 41.

[0054] When the voltage of the first input terminal 32 is less than the voltage of the second input terminal 33, that is, the voltage of the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a second level signal, the first switch 42 can be disconnected, the power input terminal Vin and the impedance element can be connected through the thermistor 41, and the current can flow to the impedance element through the thermistor 41. The current at the start of the charging circuit is limited by the high-resistance thermistor 41, so that the power input terminal Vin can charge the impedance element smoothly, thereby protecting the charging circuit.

[0055] In some embodiments, the first switch 42 may be a field effect transistor. The first switch 42 may include a source, a drain and a gate, the source may be connected to the first switch 42 , the drain may be connected to the impedance element, and the gate may be connected to the first output terminal 31 .

[0056] When the voltage of the first input terminal 32 is greater than or equal to the voltage of the second input terminal 33, that is, when the voltage of the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a first level signal, and the gate can turn on the source and the drain after receiving the first level signal, and the first switch 42 can be turned on. The power input terminal Vin and the impedance element can be turned on by the first switch 42, and the current can flow to the impedance element through the first switch 42, so that the first switch 42 can reduce the loss of the circuit by short-circuiting the thermistor 41.

[0057] When the voltage of the first input terminal 32 is less than the voltage of the second input terminal 33, that is, when the voltage of the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a second level signal, and the gate can disconnect the source and the drain after receiving the second level signal, and the first switch 42 can be disconnected. The power input terminal Vin and the impedance element can be turned on through the thermistor 41, and the current can flow to the impedance element through the thermistor 41. The current at the start of the charging circuit is limited by the high-resistance thermistor 41, so that the impedance element can be smoothly charged, thereby protecting the charging circuit.

[0058] In some embodiments, the thermal element 41 may be a positive temperature coefficient thermistor.

[0059] When the voltage of the first input terminal 32 is less than the voltage of the second input terminal 33, that is, when the voltage of the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a second level signal, the first switch 42 can be disconnected, the power input terminal Vin and the impedance element can be connected through the thermistor 41, and the current can flow to the functional component 2 through the thermistor 41. Under the thermal effect of the current, the temperature of the thermistor 41 rises rapidly, and the resistance of the thermistor 41 rises accordingly, so that the high-resistance thermistor 41 can limit the current at the start of the charging circuit, so that the capacitor of the functional component 2 can be smoothly charged, thereby protecting the charging circuit.

[0060] When the voltage of the first input terminal 32 is greater than or equal to the voltage of the second input terminal 33, that is, when the impedance element voltage is greater than or equal to the threshold voltage, the first output terminal 31 can output a first level signal, the first switch 42 can be turned on, the power input terminal Vin and the impedance element are turned on through the first switch 42, the current can flow to the impedance element through the first switch 42, and the thermistor 41 with a higher resistance is short-circuited by the first switch 42, thereby reducing the loss of the circuit.

[0061] Furthermore, when the thermistor 41 with a relatively high resistance is short-circuited by the first switch, the temperature of the thermistor 41 can be reduced, so that the thermistor 41 can stably play a protective role when the charging circuit is continuously started in a short period of time.

[0062] In some embodiments, the thermistor 41 may be a negative temperature coefficient thermistor. The charging circuit may include a third switch, one end of the third switch is connected to the thermistor 41, the other end of the third switch is connected to the functional component 2, and the third switch is connected in parallel with the first switch.

[0063] When the voltage of the first input terminal 32 is less than the voltage of the second input terminal 33, that is, the impedance element is greater than or equal to the threshold voltage, the first output terminal 31 can output a second level signal, the first switch 42 can be disconnected, the third switch can be turned on, the power input terminal Vin and the impedance element can be turned on through the thermistor 41 and the third switch, and the current can flow to the impedance element through the thermistor 41. The thermistor 41 has a higher resistance value at room temperature, so that the high-resistance thermistor 41 can limit the current at the startup of the charging circuit, and can achieve smooth charging of the impedance element, thereby protecting the charging circuit.

[0064] When the voltage of the first input terminal 32 is greater than or equal to the voltage of the second input terminal 33, that is, the impedance element voltage is greater than or equal to the threshold voltage, the first output terminal 31 can output a first level signal, the first switch 42 can be turned on, the third switch can be turned off, the power input terminal Vin and the impedance element can be turned on through the first switch, and the current can flow to the impedance element through the first switch 42, so that the thermistor 41 is not connected to the circuit, thereby reducing the loss of the circuit.

[0065] Furthermore, when the charging circuit is operating normally, the current no longer flows through the thermistor 41, so that the temperature of the thermistor 41 can be reduced to room temperature, so that the thermistor 41 can stably play a protective role when the charging circuit is continuously started in a short period of time.

[0066] By setting the third switch to control the connection relationship between the thermistor 41 and the circuit, current can flow through the first switch 42 when the first switch 42 is turned on.

[0067] In some embodiments, Figure 1 As shown, the charging circuit may include a second switch 7, and the second switch 7 may be an overvoltage protection switch.

[0068] One end of the second switch 7 can be connected to the power input terminal Vin, and the other end of the second switch 7 can be connected to the switch assembly 4. When the second switch 7 is closed, the current of the power input terminal Vin can flow into the charging circuit, and when the second switch 7 is opened, the power input terminal Vin is disconnected from the impedance element.

[0069] Exemplarily, the functional component 2 may include a charge pump 22, and the second switch 7 may be connected to the charge pump 22 signal. The charge pump 22 has a voltage detection function. When the charge pump 22 detects that the charging voltage is too large, the charge pump 22 may control the conduction state of the second switch 7. By disconnecting the second switch 7, the power input terminal Vin and the functional component 2 can be isolated, thereby realizing the protection function of the charging circuit.

[0070] Based on the same concept, an embodiment of the present disclosure also provides a power supply module.

[0071] The power module may be a mobile power source, a rechargeable battery of an electronic device, a storage battery, etc., and may be any power module with a charging circuit. In the following description, a rechargeable battery is used as an example, but the present disclosure is not limited thereto.

[0072] Figure 2 It is a schematic diagram of the structure of a power module according to an exemplary embodiment.

[0073] In some embodiments, Figure 2 As shown, the power module 200 may include a battery protection board 100 and a battery cell, and the battery protection board 100 may be disposed on the outer surface of the battery. The charging circuit may be disposed on the battery protection board 100, and the battery protection board 100 may provide a location for the charging circuit.

[0074] By setting a switch component 4 having a thermistor 41 and a first switch 42 between the power input terminal Vin of the circuit and the impedance element, and controlling the conduction state of the first switch 42 according to the relationship between the voltage of the impedance element and the threshold voltage, when the charging circuit works normally, the first switch 42 can reduce the loss of the circuit by short-circuiting the thermistor 41.

[0075] Based on the same concept, an embodiment of the present disclosure also provides an electronic device.

[0076] The electronic device may be a laptop computer, a desktop computer, a mobile phone, a digital broadcast terminal, a message transceiver, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, a translator, and a wearable device such as a watch or a bracelet, and may be any electronic device with a charging circuit. In the following description, a mobile phone is used as an example, but the present disclosure is not limited thereto.

[0077] In some embodiments, the electronic device may include a charging circuit, by setting a switch component 4 having a thermistor 41 and a first switch 42 between a power input terminal Vin of the charging circuit of the electronic device and an impedance element, and controlling the conduction state of the first switch 42 according to the relationship between the voltage of the impedance element and the threshold voltage, so that when the charging circuit is working normally, the first switch 42 can reduce the circuit loss by short-circuiting the thermistor 41.

[0078] In the embodiment of the present disclosure, a switch assembly 4 having a thermistor 41 and a first switch 42 is arranged between the power input terminal Vin of the circuit and the impedance element, and the conduction state of the first switch 42 is controlled according to the magnitude relationship between the voltage of the impedance element and the threshold voltage, so that when the charging circuit works normally, the first switch 42 can reduce the loss of the circuit by short-circuiting the thermistor 41.

[0079] It is to be understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0080] It is further understood that the terms "second", "secondary", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other and do not indicate a specific order or degree of importance. In fact, the expressions "secondary", "secondary", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the second information may also be referred to as the second information, and similarly, the second information may also be referred to as the second information.

[0081] It will be further understood that the terms “center”, “longitudinal”, “lateral”, “front”, “back”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0082] It can be further understood that, unless otherwise specified, “connection” includes a direct connection without other components between the two, and also includes an indirect connection with other components between the two.

[0083] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0084] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following scope of rights.

[0085] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A charging circuit, characterized in that: The charging circuit comprises: Power input terminal; An impedance element, wherein the power input end charges the impedance element to increase the impedance of the impedance element; a switch assembly, one end of which is connected to the power input end, and the other end of which is connected to the impedance element, wherein the switch assembly comprises a first switch and a thermistor connected in parallel, Wherein, the switch component is configured such that when the voltage of the impedance element is greater than or equal to a threshold voltage, the first switch is turned on, and the power input terminal and the impedance element are turned on through the first switch; The switch component is configured such that when the voltage of the impedance element is less than a threshold voltage, the first switch is disconnected, and the power input terminal and the impedance element are connected through the thermistor.

2. The charging circuit according to claim 1, characterized in that: The charging circuit comprises: a control element, the control element comprising an input end and a first output end, the input end is used to detect the voltage of the impedance element, and the first output end is connected to the first switch; Wherein, the input terminal detects that the voltage of the impedance element is greater than or equal to a threshold voltage, the first output terminal outputs a first level signal, and the first switch is turned on; The input terminal detects that the voltage of the impedance element is less than a threshold voltage, the first output terminal outputs a second level signal, and the first switch is disconnected.

3. The charging circuit according to claim 2, characterized in that: The charging circuit includes a reference power supply, and the voltage of the reference power supply is the threshold voltage; The input end includes a first input end and a second input end, the first input end is connected to the impedance element and obtains the voltage of the impedance element, and the second input end is connected to the reference power supply. Wherein, the voltage of the first input terminal is greater than or equal to the voltage of the second input terminal, and the first output terminal outputs the first level signal; The voltage of the first input terminal is lower than the voltage of the second input terminal, and the first output terminal outputs the second level signal.

4. The charging circuit according to claim 2, characterized in that: The first switch includes a source, a drain and a gate, the source is connected to the power input terminal, the drain is connected to the impedance element, and the gate is connected to the first output terminal. The input terminal detects that the voltage of the impedance element is greater than or equal to a threshold voltage, the first output terminal outputs a first level signal, and the source and the drain are connected to turn on the first switch; The input terminal detects that the voltage of the impedance element is less than a threshold voltage, the first output terminal generates a second level signal, and the source and the drain are disconnected, so that the first switch is turned off.

5. The charging circuit according to claim 1, characterized in that: The thermal element is a positive temperature coefficient thermistor.

6. The charging circuit according to claim 1, characterized in that: The charging circuit comprises: a second switch, one end of which is connected to the switch component, and the other end of which is connected to the power input terminal; Wherein, the second switch is an overvoltage protection switch.

7. The charging circuit according to claim 1, characterized in that: The charging circuit comprises: a third switch, one end of the third switch is connected to the thermistor, the other end of the third switch is connected to the impedance element, and the third switch is connected in parallel with the first switch, The third switch is configured such that when the voltage of the impedance element is greater than or equal to a threshold voltage, the third switch is disconnected, and the thermistor is disconnected from the impedance element; The third switch is configured such that when the voltage of the impedance element is less than a threshold voltage, the third switch is turned on, and the power input terminal and the impedance element are connected via the thermistor and the third switch; The thermal element is a negative temperature coefficient thermistor.

8. The charging circuit according to claim 1, characterized in that: The charging circuit comprises: A functional component, one end of which is connected to the switch component, the functional component includes the impedance element, and the functional component is used to monitor or change the voltage or current of the charging circuit.

9. The charging circuit according to claim 8, characterized in that: The functional components include a charge pump and / or a power management module; The impedance element includes a capacitor and / or an inductor.

10. A power module, characterized in that: include: A charging circuit as claimed in any one of claims 1 to 9.

11. An electronic device, characterized in that: include: The charging circuit as claimed in any one of claims 1 to 9, or the power module as claimed in claim 10.

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