CN112117814B

CN112117814B - Charging control circuit and chargeable and dischargeable electronic equipment

Info

Publication number: CN112117814B
Application number: CN202011316803.XA
Authority: CN
Inventors: 胡小亮; 钟德任; 李庆如; 叶建胜
Original assignee: Nanchang Jiaxin Hi Tech Co ltd
Current assignee: Nanchang Jiajie Xinyuan Technology Co ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-23
Anticipated expiration: 2040-11-23
Also published as: CN112117814A

Abstract

The invention provides a charging control circuit and a chargeable and dischargeable electronic device, wherein the charging control circuit comprises a first interface, an analog switch circuit, a control module and a second interface, and the control module controls the analog switch circuit by outputting a level signal; when the analog switch circuit is in a state controlled by the first level signal, the control module is respectively in communication connection with the first interface and the second interface; when the first interface is accessed by an external power supply and the second interface is accessed by electric equipment, the state of the analog switch circuit controlled by the first level signal is switched to the state controlled by the second level signal, at the moment, the control module is disconnected from the communication connection with the first interface and the second interface, and the data port in the first interface is directly communicated with the data port in the second interface, so that when the electric equipment sends a quick charging request, the external power supply can quickly charge the electric equipment. The invention can solve the problem that the charging time is too long when charging and discharging are carried out in the prior art.

Description

Charging control circuit and chargeable and dischargeable electronic equipment

Technical Field

The present invention relates to electronic circuits, and particularly to a charge control circuit and a chargeable and dischargeable electronic device.

Background

The portable power source is a commonly used electronic device, and the conventional portable power source generally has three functions of charging, discharging and charging and discharging. The charging refers to charging the mobile power supply by using a charging device (such as a quick charging adapter), the discharging refers to charging the electric equipment (such as a mobile phone) by using the mobile power supply, and the charging and discharging refers to charging the mobile power supply by using the charging device and simultaneously charging the electric equipment by using the mobile power supply.

When the existing mobile power supply is charged and discharged, the mobile power supply always charges the electric equipment at a lower voltage (for example, 5V), and as the battery capacity of the electric equipment (for example, a mobile phone) is larger and larger at present, the charging time is longer and longer, and the use experience of a user is seriously influenced.

Disclosure of Invention

Therefore, an object of the embodiments of the present invention is to provide a charging control circuit to solve the problem of too long charging time when charging and discharging are performed in the prior art.

A charging control circuit is applied to chargeable and dischargeable electronic equipment and comprises a first interface, an analog switch circuit, a control module and a second interface, wherein the first interface, the analog switch circuit, the control module and the second interface are electrically connected, and the control module controls the analog switch circuit by outputting a level signal;

when the analog switch circuit is in a state controlled by a first level signal, the control module is respectively in communication connection with the first interface and the second interface;

when the first interface is accessed by an external power supply and the second interface is accessed by electric equipment, the state of the analog switch circuit controlled by the first level signal is switched to the state controlled by the second level signal;

when the analog switch circuit is in the state controlled by the second level signal, the control module is respectively disconnected from the communication connection with the first interface and the second interface, and the data port in the first interface is directly communicated with the data port in the second interface, so that when the electric equipment sends a quick charging request, the external power supply can quickly charge the electric equipment.

The charging control circuit provided by the embodiment of the invention is applied to chargeable and dischargeable electronic equipment, when a control module judges that an external power supply is connected to a first interface and a piece of electric equipment is connected to a second interface, namely, when charging and discharging are carried out, the state of an analog switch circuit is switched from the state controlled by a first level signal to the state controlled by a second level signal, at the moment, a data port in the first interface is directly communicated with a data port in the second interface, so that information interaction can be directly carried out between the external power supply and the electric equipment, the chargeable and dischargeable electronic equipment is equivalent to a communication wire, the external power supply directly charges the electric equipment, and when the electric equipment sends a quick charging request, the external power supply can quickly charge the electric equipment, so that the charging time of the electric equipment during short-side charging and discharging can be shortened.

In addition, the charging control circuit according to the above embodiment of the present invention may further have the following additional technical features:

furthermore, the control module comprises a first control unit and a second control unit, the first control unit is electrically connected with the first interface and the second interface, the second control unit is electrically connected with the first control unit, and the second control unit controls the analog switch circuit by outputting a level signal;

when the first control unit judges that the first interface has external power access and the second interface has electric equipment access, the first control unit sends a first control signal to the second control unit so that the second control unit switches from outputting the first level signal to outputting the second level signal.

Further, the charging control circuit further comprises a common end, a first switch tube is arranged between the first interface and the common end, a second switch tube is arranged between the second interface and the common end, and when the analog switch circuit is in the state controlled by the second level signal, the first switch tube and the second switch tube are in an on state.

Furthermore, an on-resistance is arranged in the second switch tube, the first control unit detects a current value of the second interface through the on-resistance, and when the current value of the second interface is smaller than a preset value, the first control unit sends a second control signal to the second control unit, so that the second control unit switches from outputting the second level signal to outputting the first level signal, and the direct communication between the data port in the first interface and the data port in the second interface is disconnected.

Furthermore, the charging control circuit further comprises a first pull-down resistor and a second pull-down resistor, and the first pull-down resistor and the second pull-down resistor are respectively connected with the first interface in a break-make mode.

Further, the first interface comprises a CC1 port, a CC2 port, a first DP port and a first DM port, the analog switch circuit comprises a first analog switch sub-circuit, a second analog switch sub-circuit, a third analog switch sub-circuit and a fourth analog switch sub-circuit, the second interface comprises a second DP port and a second DM port, and the first control unit is provided with a CC1 pin, a CC2 pin, a first DP pin, a first DM pin, a second DP pin and a second DM pin;

when the analog switch circuit is in the state controlled by the first level signal, the first analog switch sub-circuit controls the CC1 port to be conducted with the CC1 pin, the second analog switch sub-circuit controls the CC2 pin to be conducted with the CC2 pin, the third analog switch sub-circuit controls the first DP port to be conducted with the first DP pin, and the second DP port and the second DP pin to be conducted, and the fourth analog switch sub-circuit controls the first DM port to be conducted with the first DM pin, and the second DM port and the second DM pin to be conducted;

when the analog switch circuit is at the second level signal, the first analog switch sub-circuit controls the CC1 port to be conducted with the first pull-down resistor, the second analog switch sub-circuit controls the CC2 port to be conducted with the second pull-down resistor, the third analog switch sub-circuit controls the first DP port to be directly communicated with the second DP port, and the fourth analog switch sub-circuit controls the first DM port to be directly communicated with the second DM port.

Further, in response to the CC1 port being conductive with the first pull-down resistor and the CC2 port being conductive with the second pull-down resistor, the external power source charges the powered device with a first preset voltage;

responding to a quick charging request sent by the electric equipment, switching the voltage of the external power supply from the first preset voltage to a second preset voltage to charge the electric equipment, wherein the second preset voltage is greater than the first preset voltage.

Further, the first pull-down resistor and the second pull-down resistor have the same resistance value.

Further, the first interface is a TYPE-C interface, and the second interface is a USB-A interface. In addition, another objective of the embodiments of the present invention is to provide a chargeable and dischargeable electronic device using the charge control circuit.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a logic structure of a charge control circuit according to an embodiment of the invention;

FIG. 2 is a schematic diagram of the logic circuit of the charge control circuit when the analog switch circuit is in the first level signal controlled state;

FIG. 3 is a schematic diagram of the logic circuit of the charge control circuit when the analog switch circuit is in the second level signal control state;

FIG. 4 is a circuit schematic of a first analog switch sub-circuit;

FIG. 5 is a circuit schematic of a second analog switch sub-circuit;

FIG. 6 is a circuit schematic of a third analog switch sub-circuit;

fig. 7 is a circuit schematic of a fourth analog switch sub-circuit.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, a charging control circuit according to an embodiment of the present invention is applied to a chargeable and dischargeable electronic device, and the embodiment is described by taking a mobile power supply as an example, the charging control circuit specifically includes a first interface 10, an analog switch circuit 20, a control module 30, and a second interface 40, the first interface 10, the analog switch circuit 20, the control module 30, and the second interface 40 are electrically connected, and the control module 30 controls the analog switch circuit 20 by outputting a level signal.

When the analog switch circuit 20 is in a state controlled by a first level signal, the control module 30 is communicatively connected to the first interface 10 and the second interface 40 respectively through a communication protocol.

When the first interface 10 has an external power access (for example, the commercial power is connected to the first interface 10 through the charging adapter), and the second interface has an access to an electric device (for example, a mobile phone), that is, when the mobile power supply is in charging and discharging, the state of the analog switch circuit 20 controlled by the first level signal is switched to the state controlled by the second level signal. It should be noted that if the external power supply is the commercial power, a charging adapter is usually needed, and if one mobile power supply a charges another mobile power supply B, then this mobile power supply a can be used as the external power supply of the mobile power supply B, and at this time, the charging adapter is not needed. In addition, if the external power supply itself has a voltage regulation circuit, the charging adapter may not be required.

When the analog switch circuit 20 is in the state controlled by the second level signal, the control module 20 disconnects the communication connection with the first interface 10 and the second interface 40, and the data port of the first interface 10 and the data port of the second interface 40 communicate directly with each other, so that the external power source can charge the electric device quickly when the electric device sends a quick charge request. The fast charging is short for fast charging, and refers to a charging process that can enable the storage battery to reach or approach a full charging state in a short time (for example, within 0.5 to 2 hours) on the premise of meeting a fast protocol (for example, a QC protocol, a PD protocol, and the like), and is mainly realized by increasing a charging voltage. With the present invention, as long as both the external power supply and the electric device have the fast charging protocol, the fast charging of the electric device can be realized when the data port in the first interface 10 and the data port in the second interface 40 communicate directly. It should be noted that if the external power source has the fast charging protocol, the adapter is not needed, and if the external power source does not have the fast charging protocol, the adapter having the fast charging protocol needs to be connected.

For example, a conventional mobile power supply can only charge a mobile phone slowly with a voltage of 5V when charging (for example, discharging) the mobile phone. After the invention is adopted, when the mobile power supply is connected with the external power supply and the electric equipment (such as a mobile phone) at the same time, if the mobile phone sends a 10V quick charging request, the external power supply can quickly charge the mobile phone at a voltage of 10V (or higher), thereby greatly shortening the charging time.

According to the above-mentioned charging control circuit, when the control module 30 determines that the first interface 10 has an external power access and the second interface 40 has an electrical device access, that is, when charging and discharging are performed, the control module 30 controls the analog switch circuit 20 to switch from the state controlled by the first level signal to the state controlled by the second level signal, at this time, the data port in the first interface 10 and the data port in the second interface 40 directly communicate with each other, so that information interaction can be directly performed between the external power and the electrical device, the chargeable and dischargeable electronic device is equivalent to a communication wire, and the external power directly charges the electrical device. The electric equipment and the external power supply can be communicated through a communication protocol, for example, the electric equipment requests quick charging through a quick charging protocol, and when the electric equipment sends a quick charging request, the external power supply can quickly charge the electric equipment, so that the charging time of the electric equipment can be shortened when the electric equipment is charged and discharged.

Specifically, in this embodiment, the first interface 10 is a TYPC-C interface, and the second interface 40 is a usb interface.

The first interface 10 includes a CC1 port, a CC2 port, a first DP port DP1 and a first DM port DM1, wherein the CC1 port and the CC2 port are Configuration channels (Configuration channels), and the first DP port (Data Plus port, Data positive signal port) and the first DM port (Data Minus port, Data negative signal port) are Data ports, to which insertion detection is applied.

The second interface 40 includes a second DP port DP2, a second DM port DM2, the second DP port and the second DM port also being data ports.

The control module 30 specifically includes a first control unit 31 and a second control unit 32, the first control unit 31 is electrically connected to the first interface 10 and the second interface 40, the second control unit 32 is electrically connected to the first control unit 31, and specifically, the second control unit 32 controls the analog switch circuit 20 through an output level signal.

The first control unit 31 employs an IC, the first control unit 31 having a CC1 pin, a CC2 pin, a first DP pin DP3 and a first DM pin DM 3. The first control unit 31 also has a second DP pin DP4 and a second DM pin DM 4.

The second control unit 32 employs an MCU.

When the first control unit 31 determines that the first interface 10 has an external power access and the second interface 40 has an electrical device access, the first control unit 31 sends a first control signal to the second control unit 32, so that the second control unit 32 switches from outputting a first level signal to outputting a second level signal.

It should be noted that in this embodiment, the control of the signal is realized by two control units, namely, the first control unit 31 (i.e., IC) and the second control unit 32 (i.e., MCU), and in specific implementation, the first control unit 31 and the second control unit 32 may be integrated together, and the control of the signal is realized by one integrated chip.

The analog switch circuit 20 includes a first analog switch sub-circuit 21, a second analog switch sub-circuit 22, a third analog switch sub-circuit 23, and a fourth analog switch sub-circuit 24. It should be noted that fig. 2 and fig. 3 show schematic logic circuit diagrams of the charging control circuit, and in particular, the third analog switch sub-circuit 23 and the fourth analog switch sub-circuit 24 both include a plurality of switching tubes, so that two reference numerals 23 and two reference numerals 24 are present in fig. 2 and fig. 3, and the detailed circuit diagrams of the third analog switch sub-circuit 23 and the fourth analog switch sub-circuit 24 can refer to fig. 6 and fig. 7.

The charging control circuit further comprises a common terminal VMID, a first switch tube Q1 is arranged between the first interface 10 and the common terminal VMID, a second switch tube Q2 is arranged between the second interface 40 and the common terminal VMID, and the first interface 10 and the second interface 40 are isolated by a first switch tube Q1 and a second switch tube Q2. In this embodiment, MOS transistors are used for the first switching transistor Q1 and the second switching transistor Q2.

In specific implementation, a BUCK/BOOST circuit of the DCDC can be connected to the rear end of the VMID, namely the BUCK/BOOST circuit is arranged in the IC and is used for supporting internal charging and external discharging.

The charging control circuit further includes a first pull-down resistor R14 and a second pull-down resistor R13, and the first pull-down resistor R14 and the second pull-down resistor R13 are respectively connected to the first interface 10 in an on-off manner. Specifically, one end of the first pull-down resistor R14 and one end of the second pull-down resistor R13 are electrically connected to the analog switch circuit 20, and the other end of the first pull-down resistor R14 and the other end of the second pull-down resistor R13 are grounded. In this embodiment, the first pull-down resistor R14 and the second pull-down resistor R13 have the same resistance value, which is 5.1K Ω.

Please refer to fig. 2, the analog switch circuit 20 is default in a low state (i.e. a state controlled by a first level signal), in the low state, the first analog switch sub-circuit 21 controls the CC1 port to be conducted with the CC1 pin, the second analog switch sub-circuit 22 controls the CC2 port to be conducted with the CC2 pin, the third analog switch sub-circuit 23 controls the first DP port DP1 to be conducted with the first DP pin DP3, the second DP port DP2 to be conducted with the second DP pin DP4, and the fourth analog switch sub-circuit 24 controls the first DM port DM1 to be conducted with the first DM pin DM3, and the second DM port DM2 to be conducted with the second DM pin DM 4.

Specifically, referring to fig. 4 to 7, when the analog switch circuit 20 is in the low level state, the states of the MOS transistors in the first analog switch sub-circuit 21 are as follows:

the MOS transistor Q11 is in a conducting state, the MOS transistor Q12 is in a cut-off state, and the MOS transistor Q13 is in a cut-off state;

the states of the MOS transistors in the second analog switch sub-circuit 22 are specifically as follows:

the MOS transistor Q14 is in a conducting state, the MOS transistor Q15 is in a cut-off state, and the MOS transistor Q16 is in a cut-off state;

the states of the MOS transistors in the third analog switch sub-circuit 23 are as follows:

the MOS transistor Q17, the MOS transistor Q18, the MOS transistor Q21, and the MOS transistor Q22 are in an on state, and the MOS transistor Q19, the MOS transistor Q20, and the MOS transistor Q23 are in an off state.

The states of the MOS transistors in the fourth analog switch sub-circuit 24 are specifically as follows:

the MOS transistor Q24, the MOS transistor Q25, the MOS transistor Q28, and the MOS transistor Q29 are in an on state, and the MOS transistor Q26, the MOS transistor Q27, and the MOS transistor Q30 are in an off state.

Since the CC1 port, the CC2 port of the first interface 10 are directly connected to the CC1 pin and the CC2 pin of the IC, when the first interface 10 has an external power access, the IC can determine that the external power is plugged in through a related protocol.

When the second interface 40 is connected with an electric device, the IC can determine that the second interface 40 has a load inserted through the falling edge of VOUT1, and then communicate with the second control unit 32 (i.e., MCU) through the I2C, the MCU sets the analog switch circuit 20 to a high level state (i.e., a state controlled by a second level signal), and turns on the first switch transistor Q1 and the second switch transistor Q2, i.e., when the analog switch circuit 20 is in the state controlled by the second level signal, the first switch transistor Q1 and the second switch transistor Q2 are in an on state, and an external power supply directly supplies power to the electric device through the first port and the second port.

Referring to fig. 3, when the analog switch circuit 20 is in the second level signal control state, the first analog switch sub-circuit 21 controls the CC1 port to be conducted with the first pull-down resistor R14, the second analog switch sub-circuit 22 controls the CC2 port to be conducted with the second pull-down resistor R13, the third analog switch sub-circuit 23 controls the first DP port DP1 to directly communicate with the second DP port DP2, and the fourth analog switch sub-circuit 24 controls the first DM port DM1 to directly communicate with the second DM port DM 2.

When the analog switch circuit 20 is in the high level state, the states of the MOS transistors in the first analog switch sub-circuit 21 are as follows:

the MOS transistor Q11 is in a cut-off state, the MOS transistor Q12 is in a conducting state, and the MOS transistor Q13 is in a conducting state;

the MOS transistor Q14 is in a cut-off state, the MOS transistor Q15 is in a conducting state, and the MOS transistor Q16 is in a conducting state;

the MOS transistor Q17, the MOS transistor Q18, the MOS transistor Q21, and the MOS transistor Q22 are in an off state, and the MOS transistor Q19, the MOS transistor Q20, and the MOS transistor Q23 are in an on state.

the MOS transistor Q24, the MOS transistor Q25, the MOS transistor Q28, and the MOS transistor Q29 are in an off state, and the MOS transistor Q26, the MOS transistor Q27, and the MOS transistor Q30 are in an on state.

The truth table corresponding to the above process is specifically as follows:

the CC1 port and the CC2 port are pulled down to the ground by the first pull-down resistor R14 and the second pull-down resistor R13, the mobile power supply is forced to be configured in a SINK state (a power transmission state), an external power supply (for example, a charging adapter) is output at 5V, the first DP port and the second DM port in the TYPE-C interface are directly connected to the second DP port and the second DM port in the USBA interface, and then the electric device can directly communicate with the charging adapter to adjust a charging voltage, specifically, increase the charging voltage, so as to shorten the charging time.

Specifically, in response to the connection between the CC1 port and the first pull-down resistor R14 and the connection between the CC2 port and the second pull-down resistor R13, the external power source charges the electric device with a first preset voltage, for example, the charging adapter first supplies 5V to the electric device.

In response to a quick charging request sent by the electric equipment, the voltage of the external power supply is switched from the first preset voltage to a second preset voltage to charge the electric equipment, wherein the second preset voltage is greater than the first preset voltage, and the second preset voltage is 10V for example, that is, the charging adapter can supply power to the electric equipment with the voltage of 10V.

Specifically, in this embodiment, the second switch Q2 has an on-resistance (i.e. a built-in Rdson, not shown), the first control unit 31 detects a current value of the second interface 40 through the on-resistance, when the current value of the second interface 40 is smaller than the preset value, the first control unit 31 sends a second control signal to the second control unit 32, so that the second control unit 32 controls the analog switch circuit 20 to switch from the state controlled by the second level signal to the state controlled by the first level signal, and disconnects the direct communication between the data port in the first interface 10 and the data port in the second interface 40, namely, the through connection between the first DP port and the second DP port and the through connection between the first DM port and the second DM port are cut off, and at this time, the external power supply is switched to charge the mobile power supply through the charging adapter.

It should be noted that, in the above description, the first interface 10 (TYPC-C interface) is first connected to the charging device, and the second interface 40 (USBA interface) is then connected to the electric device, when the specific implementation is performed, if the second interface 40 is first connected to the electric device, and the first interface 10 is then connected to the charging device, the first control unit 31 (i.e., IC) will first communicate according to the CC Pin protocol, determine the TYPE-C external device as SOURCE, and then switch the analog switch circuit 20 from the default low level state to the high level state, and the subsequent work flow is the same.

In addition, it should be noted that the core idea of the present invention is to open the communication port to allow the external power supply and the electric equipment to directly communicate by detecting that the external power supply and the electric equipment are simultaneously connected, and the two can handshake matching voltages, which has the advantages of simplicity, safety and high efficiency, and does not need too many controllers to transfer signals, thereby avoiding the occurrence of delay.

Another embodiment of the present invention further provides a rechargeable electronic device, in which the charging control circuit is disposed, and the electronic device is, for example, a rechargeable mobile power supply, a rechargeable notebook (for example, the notebook charges a mobile phone while charging itself), a rechargeable mobile phone (for example, the mobile phone charges another mobile phone while charging itself), or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A charging control circuit is applied to chargeable and dischargeable electronic equipment and is characterized by comprising a first interface, an analog switch circuit, a control module and a second interface, wherein the first interface, the analog switch circuit, the control module and the second interface are electrically connected, and the control module controls the analog switch circuit by outputting a level signal;

when the analog switch circuit is in a state controlled by the second level signal, the control module disconnects the communication connection with the first interface and the second interface respectively, and the data port in the first interface and the data port in the second interface are in direct communication, so that when the electric equipment sends a quick charging request, the external power supply can quickly charge the electric equipment;

in response to the state of the analog switch circuit controlled by the first level signal being switched to the state controlled by the second level signal, the external power supply charges the electric device with a first preset voltage; responding to a quick charging request sent by the electric equipment, switching the voltage of the external power supply from the first preset voltage to a second preset voltage to charge the electric equipment, wherein the second preset voltage is greater than the first preset voltage.

2. The charging control circuit of claim 1, wherein the control module comprises a first control unit and a second control unit, the first control unit is electrically connected to the first interface and the second interface, the second control unit is electrically connected to the first control unit, and the second control unit controls the analog switch circuit by outputting a level signal;

3. The charging control circuit of claim 2, further comprising a common terminal, wherein a first switch tube is disposed between the first interface and the common terminal, a second switch tube is disposed between the second interface and the common terminal, and when the analog switch circuit is in the second level signal control state, the first switch tube and the second switch tube are in an open state.

4. The charging control circuit according to claim 3, wherein an on-resistance is disposed in the second switch tube, the first control unit detects a current value of the second interface through the on-resistance, and when the current value of the second interface is smaller than a preset value, the first control unit sends a second control signal to the second control unit, so that the second control unit switches from outputting the second level signal to outputting the first level signal, so as to disconnect direct communication between the data port in the first interface and the data port in the second interface.

5. The charging control circuit of claim 2, further comprising a first pull-down resistor and a second pull-down resistor, wherein the first pull-down resistor and the second pull-down resistor are respectively connected to the first interface in an on-off manner.

6. The charge control circuit of claim 5, wherein the first interface comprises a CC1 port, a CC2 port, a first DP port, and a first DM port, wherein the analog switch circuit comprises a first analog switch sub-circuit, a second analog switch sub-circuit, a third analog switch sub-circuit, and a fourth analog switch sub-circuit, wherein the second interface comprises a second DP port and a second DM port, and wherein the first control unit has a CC1 pin, a CC2 pin, a first DP pin, a first DM pin, a second DP pin, and a second DM pin;

when the analog switch circuit is in the state controlled by the first level signal, the first analog switch sub-circuit controls the CC1 port to be conducted with the CC1 pin, the second analog switch sub-circuit controls the CC2 port to be conducted with the CC2 pin, the third analog switch sub-circuit controls the first DP port to be conducted with the first DP pin, and the second DP port and the second DP pin to be conducted, and the fourth analog switch sub-circuit controls the first DM port to be conducted with the first DM pin, and the second DM port and the second DM pin to be conducted;

7. The charge control circuit of claim 6, wherein the external power source charges the powered device at a first preset voltage in response to the CC1 port being conductive with the first pull-down resistor and the CC2 port being conductive with the second pull-down resistor;

8. The charge control circuit of claim 5, wherein the first pull-down resistor and the second pull-down resistor have equal resistance values.

9. The charge control circuit of claim 1, wherein the first interface is a TYPE-C interface and the second interface is a USB-a interface.

10. A chargeable and dischargeable electronic device comprising the charge control circuit according to any one of claims 1 to 9.