Power adapter

Abstract

The utility model relates to a power adapter. The power adapter comprises a charging circuit; the output end is used for being connected with equipment to be charged; the protection circuit is arranged between the charging circuit and the output end, the protection circuit comprises a connecting end, and the protection circuit is connected with the charging circuit through the connecting end; and the power storage module is connected to the protection circuit, and the power storage module is used for maintaining the load voltage of the power adapter not to exceed the threshold voltage when the voltage of the output end is smaller than the voltage of the to-be-charged equipment. The power storage module is arranged between the charging circuit and the output end, and when the voltage of the output end is smaller than the voltage of the to-be-charged equipment, the circuit charges the power storage module preferentially, so that the load voltage of the power adapter does not exceed the threshold voltage, and the power adapter is protected.

Description

Technical Field

[0001] The present disclosure relates to the field of charging technology, and in particular to a power adapter. Background Art

[0002] As electronic devices such as mobile phones and tablet computers gradually become indispensable in people's daily lives, the demand for charging devices is increasing. The power adapter can convert the commonly used 220V voltage in the home into a voltage suitable for the battery of the electronic device, thereby realizing the charging of the electronic device.

[0003] Different electronic devices have different applicable charging voltages for their batteries, and their battery discharge voltages are also different. The power adapter can match the corresponding electronic device by setting the output voltage parameters in a targeted manner. If a power adapter that does not match the electronic device is used, its voltage parameters may not meet the charging requirements of the electronic device, and may cause damage to the power adapter. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a power adapter.

[0005] According to a first aspect of an embodiment of the present disclosure, a power adapter is provided, comprising: a charging circuit; an output end, the output end being used to connect to a device to be charged; a protection circuit, the protection circuit being arranged between the charging circuit and the output end, the protection circuit comprising a connection end, the protection circuit being connected to the charging circuit via the connection end; a power storage module, the power storage module being connected to the protection circuit, wherein the power storage module is used to maintain the load voltage of the power adapter not exceeding a threshold voltage when the voltage at the output end is lower than the voltage of the device to be charged.

[0006] In some embodiments, the connection end includes a first port and a second port; the power storage module includes a capacitor group; wherein the first end of the capacitor group is connected to the first port and the output end, and the second end of the capacitor group is connected to the second port and the output end.

[0007] In some embodiments, the connection end outputs alternating current, and the output end outputs direct current; the power storage module includes a diode, and the diode includes an anode and a cathode; the cathode of the diode is connected in series with the first end of the capacitor group, and the anode of the diode is connected to the first port and the output end.

[0008] In some embodiments, the power storage module includes a power consumption component, and the power consumption component is connected in parallel with the capacitor group.

[0009] In some embodiments, the power consumption component is a resistor, and the resistance value of the resistor is 7Ω to 13Ω.

[0010] In some embodiments, the capacitance value of the capacitor group is 1.5F to 2.0F; the withstand voltage value of the capacitor group is 5.5V to 6.0V.

[0011] In some embodiments, the capacitor group includes one or more capacitors connected in parallel.

[0012] In some embodiments, the protection circuit includes: a switch module, when the voltage at the output end is greater than the voltage of the device to be charged, the switch module is turned on; when the voltage at the output end is less than the voltage of the device to be charged, the switch module is turned off.

[0013] In some embodiments, the switch module includes a switch component and a comparator, the comparator includes a first input interface, a second input interface and a first output interface; one end of the switch component is connected to the connection end, and the other end of the switch component is connected to the output end; the first input interface of the comparator is connected to the connection end, the second input interface of the comparator is connected to the output end, and the first output interface of the comparator is connected to the switch component.

[0014] In some embodiments, the voltage of the first input interface is greater than the voltage of the second input interface, the first output interface outputs a low level to the switch component, and the switch component is turned on; the voltage of the first input interface is less than the voltage of the second input interface, the first output interface outputs a high level to the switch component, and the switch component is turned off.

[0015] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the present disclosure provides a power storage module between the charging circuit and the output end. When the voltage at the output end is lower than the voltage of the device to be charged, the circuit will give priority to charging the power storage module, thereby maintaining the load voltage of the power adapter not exceeding the threshold voltage, thereby protecting the power adapter.

[0016] 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

[0017] 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.

[0018] Figure 1 The figure is a schematic diagram of a protection circuit of a power adapter according to an exemplary embodiment.

[0019] Figure 2 The invention is a circuit diagram of a protection circuit of a power adapter according to an exemplary embodiment.

[0020] Figure 3 The figure is a schematic diagram of a protection circuit of a power adapter 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, when the power adapter does not match the device to be charged, the voltage of the device to be charged may be greater than the output voltage of the power adapter, so that the current flows back from the device to be charged into the adapter, causing damage to the adapter.

[0023] By setting a switch module in the power adapter, the circuit can be disconnected when current is reversed into the power adapter, thereby protecting the power adapter. However, there is a certain delay in disconnecting the switch module, and the power adapter may still be damaged by the current conduit within a short period of time.

[0024] In order to solve the above technical problems, according to an embodiment of the present disclosure, a power adapter is provided, which includes: a charging circuit; an output end, which is used to connect to a device to be charged; a protection circuit, which is arranged between the charging circuit and the output end, and the protection circuit includes a connection end, and the protection circuit is connected to the charging circuit through the connection end; a power storage module, which is connected to the protection circuit, wherein the power storage module is used to maintain the load voltage of the power adapter not exceeding a threshold voltage when the voltage at the output end is lower than the voltage of the device to be charged.

[0025] The present invention provides a power storage module between the charging circuit and the output end. When the voltage of the output end is lower than the voltage of the device to be charged, the circuit will give priority to charging the power storage module, thereby maintaining the load voltage of the power adapter not exceeding the threshold voltage, thereby protecting the power adapter.

[0026] It can be understood that the power adapter involved in the present disclosure can be suitable for charging any terminal listed below.

[0027] 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.

[0028] Figure 1 The figure is a schematic diagram of a protection circuit of a power adapter according to an exemplary embodiment.

[0029] In some embodiments, Figure 1 As shown, the power adapter may include a charging circuit and a protection circuit. The protection circuit can prevent current from flowing back into other circuit modules of the power adapter, thereby avoiding damage to the power adapter due to current backflow when the power adapter is connected to an unmatched device to be charged, thereby protecting the power adapter.

[0030] The power adapter may include an output terminal 2 , and the protection circuit may include a connection terminal 1 and a power storage module 3 .

[0031] Connection terminal 1 can be the current input terminal of the protection circuit when the power adapter is working normally. The protection circuit can be connected to the charging circuit through connection terminal 1, and the current of other circuit modules of the power adapter can flow into the protection circuit from connection terminal 1. For example, the current of the charging circuit can flow into the protection circuit from connection terminal 1.

[0032] The output terminal 2 can be the current output terminal when the power adapter is working normally. The output terminal 2 can be used to connect to the device to be charged. The current of the protection circuit can be output to the device to be charged connected to the power adapter via the output terminal 2.

[0033] The power storage module 3 may be connected between the connection terminal 1 and the output terminal 2 , and the power storage module 3 may be a module for storing electric energy.

[0034] When the power adapter is in normal working state, the voltage of the connection terminal 1 is greater than the voltage of the output terminal 2, and the current flows from the connection terminal 1 to the output terminal 2. The power adapter can change the high-voltage AC power into a low-voltage DC power that matches the device to be charged, so that the device to be charged can be charged through the power adapter. At this time, the power storage module 3 does not accumulate electric energy, thereby preventing interference with the output current of the protection circuit and ensuring that the power adapter can work normally.

[0035] When the voltage at output terminal 2 is lower than the voltage of the device to be charged, for example, when the battery voltage of the device to be charged connected to the power adapter is higher than the output voltage of the power adapter, the current flow direction will change from output terminal 2 to connection terminal 1, that is, current backflow will occur.

[0036] At this time, the current of the output terminal 2 can preferentially charge the power storage module 3, so that the power storage module 3 can store electric energy from the output terminal 2, and the power storage module 3 can maintain the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 not exceeding the threshold voltage during the power storage process, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 is maintained within a safe range, thereby reducing the situation where the power adapter is damaged by current backflow and protecting the power adapter.

[0037] Figure 2 The invention is a circuit diagram of a protection circuit of a power adapter according to an exemplary embodiment.

[0038] In some embodiments, Figure 1 and Figure 2 As shown, the connection terminal 1 may include a first port 11 and a second port 12 ; the first port 11 and the second port 12 may be two ports into which the current of the connection terminal 1 flows.

[0039] The power storage module 3 may include a capacitor group 31 . When the voltage at the connection terminal 1 of the protection circuit is lower than the voltage at the output terminal 2 , the capacitor group 31 may store the electric energy from the output terminal 2 .

[0040] Among them, the first end of the capacitor group 31 can be connected to the first port 11 and the output terminal 2, and the second end of the capacitor group 31 can be connected to the second port 12 and the output terminal 2. Exemplarily, the first end of the capacitor group 31 can be a plate of the capacitor group 31, and the second end of the capacitor group 31 can be another plate of the capacitor group 31. Through the above connection method, when the voltage at the output terminal 2 is greater than the voltage at the connection terminal 1, the voltage at both ends of the storage module 3 can be equal to the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1. And when the capacitor group 31 accumulates electric energy from the output terminal 2, the voltage at both ends of the capacitor group 31 rises slowly, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 does not exceed the threshold voltage, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 is maintained within a safe range, thereby reducing the situation where the power adapter is damaged by current backflow and protecting the power adapter.

[0041] In some embodiments, Figure 1 and Figure 2 As shown, the connection terminal 1 can output alternating current, and the output terminal 2 can output direct current.

[0042] The power storage module 3 may include a diode D2, and the diode D2 may include an anode and a cathode. Within the operating voltage of the power adapter, current can flow from the anode of the diode D2 to the cathode of the diode D2, and current cannot flow from the cathode of the diode D2 to the anode of the diode D2.

[0043] The cathode of the diode D2 is connected in series with the first end of the capacitor group 31, and the anode of the diode D2 is connected to the first port 11 and the output terminal 2. Through the above connection, the discharge current of the power storage module 3 will not flow into other circuit modules of the power adapter.

[0044] Since the current output by the connection terminal 1 is alternating current, and the capacitor group 31 is equivalent to a circuit breaker for alternating current, when the power adapter works normally, the connection terminal 1 will not store electricity for the capacitor group 31 of the power storage module 3.

[0045] Since the power adapter is connected to the battery of the device to be charged, and the current output by the battery of the device to be charged is direct current, when the voltage of the connection terminal 1 of the protection circuit is lower than the voltage of the output terminal 2, the current output by the battery of the device to be charged can charge the capacitor group 31 of the power storage module 3, which reduces the amount of current flowing into other circuit modules of the power adapter when the current is reversed. And when the capacitor group 31 accumulates the electric energy from the output terminal 2, the voltage at both ends of the capacitor group 31 rises slowly, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 does not exceed the threshold voltage, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 is maintained within a safe range, thereby reducing the damage of the power adapter due to the reverse current and protecting the power adapter.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the power storage module 3 may include a power consumption component R1 , and the power consumption component R1 may be any circuit element capable of consuming electric energy.

[0047] The power consumption component R1 may be connected in parallel with the capacitor group 31 . Exemplarily, one end of the power consumption component R1 may be connected to one plate of the capacitor group 31 , and the other end of the power consumption component R1 may be connected to another plate of the capacitor group 31 .

[0048] When the voltage of the output terminal 2 is lower than the voltage of the device to be charged, the capacitor group 31 can store electric energy. When the power adapter is disconnected from the external electronic device, current will be generated between the plates of the capacitor group 31. The electric energy stored in the capacitor group 31 can be stably consumed through the power consumption component R1. This can prevent the electric energy stored in the capacitor group 31 from being released too quickly while consuming the electric energy stored in the power storage module 3, thereby negatively affecting the circuit stability.

[0049] In some embodiments, Figure 2 As shown, the power consumption component R1 may be a resistor. When the power storage module 3 releases the stored electric energy, the power consumption component R1 may convert the electric energy into heat energy, thereby completing the release of the stored electric energy of the power storage module 3.

[0050] In some embodiments, the resistance value of the resistor may be 7Ω to 13Ω, so as to adapt to the power release requirements of the power storage module 3. However, the present disclosure is not limited thereto, and the resistance value of the resistor may be changed according to the design parameters of the power adapter. For example, when the design voltage of the power adapter is relatively large, the resistance value of the resistor may be increased accordingly, and when the design voltage of the power adapter is relatively small, the resistance value of the resistor may be reduced accordingly.

[0051] In some embodiments, the capacitance value of the capacitor group 31 is 1.5F to 2.0F. If the capacitance value of the capacitor group 31 is low, when current backflow occurs in the power adapter, the power storage module 3 will be quickly fully charged, and the voltage across the power storage module 3 will rise rapidly, thereby losing the protection function of other circuit modules of the power adapter.

[0052] However, the present disclosure is not limited to this. The capacitance value of the capacitor group 31 can be determined according to the voltage that the power adapter may carry and the required protection time. The larger the capacitance value of the capacitor group 31, the larger the voltage range that the capacitor group 31 can protect. Under the same voltage, the larger the capacitance value of the capacitor group 31, the more difficult it is to fully charge the capacitor group 31, and the longer the protection time for the power adapter.

[0053] In some embodiments, the withstand voltage of the capacitor group 31 is 5.5 V to 6.0 V. The withstand voltage of the capacitor group 31 can be determined according to the voltage that the power adapter may carry.

[0054] In some embodiments, the capacitor group 31 may include multiple capacitors C2 connected in parallel. By connecting multiple capacitors C2 in parallel, the capacitance requirement of a single capacitor C2 is lower, and the capacitor C2 with a lower capacitance value has a smaller volume, thereby reducing the installation space of the capacitor group 31.

[0055] In some other embodiments, the capacitor group 31 may also include only one capacitor C2.

[0056] Figure 3 The figure is a schematic diagram of a protection circuit of a power adapter according to an exemplary embodiment.

[0057] In some embodiments, Figure 2 and Figure 3 As shown, the protection circuit may include a switch module 4 connected between a connection terminal 1 and an output terminal 2 of the protection circuit.

[0058] The switch module 4 can compare the voltage of the connection terminal 1 of the protection circuit with the voltage of the output terminal 2, and turn the switch module 4 on or off according to the comparison result.

[0059] When the voltage at the connection terminal 1 of the protection circuit is greater than the voltage at the output terminal 2 , the switch module 4 can be turned on, the power adapter is in normal working state, and the current can flow from the connection terminal 1 of the protection circuit to the output terminal 2 .

[0060] When the voltage at the connection terminal 1 of the protection circuit is lower than the voltage at the output terminal 2 , current backflow occurs in the power adapter, and the switch module 4 can be disconnected, thereby disconnecting the power adapter from the external power supply.

[0061] Since it takes a certain amount of time for the switch module 4 to compare the voltage of the connection terminal 1 of the protection circuit with the voltage of the output terminal 2, the switch module 4 cannot be disconnected at the moment when the current backflow occurs. At this time, the current of the output terminal 2 can charge the power storage module 3, which reduces the amount of current flowing into other circuit modules of the power adapter when the current backflows. In addition, when the power storage module 3 accumulates the electric energy from the output terminal 2, the voltage at both ends of the power storage module 3 rises slowly, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 does not exceed the threshold voltage, so that the load voltage of the connection terminal 1 and other circuit modules connected to the connection terminal 1 can be maintained within a safe range before the switch module 4 is disconnected, thereby reducing the situation where the power adapter is damaged by the current backflow before the switch module 4 is disconnected, and protecting the power adapter.

[0062] In some embodiments, Figure 2 As shown, the switch module 4 may include a switch component 41 and a comparator 42 .

[0063] The comparator 42 may include a first input interface, a second input interface and a first output interface. The comparator 42 may change the level of the signal output by the first output interface according to the voltage difference between the first input interface and the second input interface.

[0064] One end of the switch component 41 is connected to the connection terminal 1, and the other end of the switch component 41 is connected to the output terminal 2. When the switch component 41 is turned on, the connection terminal 1 and the output terminal 2 are connected, and when the switch component 41 is turned off, the connection terminal 1 and the output terminal 2 are disconnected.

[0065] The first input interface of the comparator 42 is connected to the connection terminal 1 so that the comparator 42 can obtain the voltage of the connection terminal 1 . The second input interface of the comparator 42 is connected to the output terminal 2 so that the comparator 42 can obtain the voltage of the output terminal 2 .

[0066] The first output port of the comparator 42 is also connected to the switch component 41, and the first output port of the comparator 42 can control the on and off of the switch component 41. Exemplarily, the switch component 41 can be a field effect transistor.

[0067] In some embodiments, when the power adapter is working normally, the voltage at the connection terminal 1 of the protection circuit is greater than the voltage at the output terminal 2. At this time, the voltage at the first input interface is greater than the voltage at the second input interface. The third output port outputs a low level to the switch component 41, and the switch component 41 is turned on.

[0068] When current backflow occurs in the power adapter, the voltage at the connection terminal 1 of the protection circuit is lower than the voltage at the output terminal 2. At this time, the voltage at the first input interface is lower than the voltage at the second input interface. The third output port outputs a high level to the switch component 41, and the switch component 41 is disconnected.

[0069] Through the connection relationship between the switch component 41 and the comparator 42, when current backflow occurs in the power adapter, the switch module 4 can disconnect the connection terminal 1 and the output terminal 2 of the protection circuit in a short time, thereby reducing the damage to the power adapter due to current backflow and protecting the power adapter.

[0070] In some embodiments, the power adapter may include a charging circuit and a protection circuit.

[0071] The charging circuit can convert high-voltage alternating current into low-voltage direct current that meets the charging needs of electronic devices. The protection circuit can disconnect the circuit in time when current backflow occurs, thereby protecting the charging circuit.

[0072] The charging circuit may include an output terminal, and the connection terminal 1 of the protection circuit may be connected to the output terminal of the charging circuit, so that the current of the charging circuit may be transmitted to the outside through the protection circuit, illustratively, to the battery of the electronic device.

[0073] In the embodiment of the present disclosure, a power storage module 3 is arranged between the connection terminal 1 and the output terminal 2. When the voltage of the output terminal 2 is greater than the voltage of the connection terminal 1, the output terminal 2 will preferentially charge the power storage module 3, thereby maintaining the load voltage of the power adapter not exceeding the threshold voltage, thereby protecting the power adapter.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 power adapter, characterized in that: The power adapter comprises: Charging circuit; An output end, the output end is used to connect to a device to be charged; a protection circuit, the protection circuit being arranged between the charging circuit and the output end, the protection circuit comprising a connection end, and the protection circuit being connected to the charging circuit via the connection end; a power storage module, the power storage module being connected to the protection circuit, The power storage module is used to maintain the load voltage of the power adapter not exceeding a threshold voltage when the voltage at the output end is lower than the voltage of the device to be charged.

2. The power adapter according to claim 1, characterized in that: The connection end includes a first port and a second port; The power storage module includes a capacitor bank; The first end of the capacitor group is connected to the first port and the output end, and the second end of the capacitor group is connected to the second port and the output end.

3. The power adapter according to claim 2, characterized in that: The connection end outputs alternating current, and the output end outputs direct current; The power storage module includes a diode, and the diode includes an anode and a cathode; The cathode of the diode is connected in series with the first end of the capacitor group, and the anode of the diode is connected to the first port and the output end.

4. The power adapter according to claim 2, characterized in that: The power storage module includes a power consumption component, and the power consumption component is connected in parallel with the capacitor group.

5. The power adapter according to claim 4, characterized in that: The power consumption component is a resistor, and the resistance value of the resistor is 7Ω to 13Ω.

6. The power adapter according to claim 2, characterized in that: The capacitance value of the capacitor group is 1.5F to 2.0F; The withstand voltage of the capacitor group is 5.5V to 6.0V.

7. The power adapter according to claim 2, characterized in that: The capacitor group includes one or more capacitors connected in parallel.

8. The power adapter according to claim 1, characterized in that: The protection circuit comprises: A switch module, wherein the voltage at the output end is greater than the voltage of the device to be charged, and the switch module is turned on; The voltage at the output end is lower than the voltage of the device to be charged, and the switch module is disconnected.

9. The power adapter according to claim 8, characterized in that: The switch module includes a switch component and a comparator, and the comparator includes a first input interface, a second input interface and a first output interface; One end of the switch component is connected to the connection end, and the other end of the switch component is connected to the output end; The first input interface of the comparator is connected to the connection end, the second input interface of the comparator is connected to the output end, and the first output interface of the comparator is connected to the switch component.

10. The power adapter according to claim 9, characterized in that: The voltage of the first input interface is greater than the voltage of the second input interface, the first output interface outputs a low level to the switch component, and the switch component is turned on; The voltage of the first input interface is lower than the voltage of the second input interface, the first output interface outputs a high level to the switch component, and the switch component is disconnected.

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