CN215990253U - Charging management circuit and mobile terminal - Google Patents
Charging management circuit and mobile terminal Download PDFInfo
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- CN215990253U CN215990253U CN202121786344.1U CN202121786344U CN215990253U CN 215990253 U CN215990253 U CN 215990253U CN 202121786344 U CN202121786344 U CN 202121786344U CN 215990253 U CN215990253 U CN 215990253U
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Abstract
The utility model provides a charging management circuit and a mobile terminal, wherein the charging management circuit comprises a power module and a charging circuit, the charging circuit is electrically connected with the power module, the charging circuit is used for connecting an external power supply so as to charge the power module with the external power supply, and the charging circuit is also used for connecting external OTG electronic equipment so as to enable the power module to supply power to the external OTG electronic equipment; the charging circuit is provided with an overvoltage protection chip and a current-limiting switch, and the overvoltage protection chip is connected with the current-limiting switch in parallel; the overvoltage protection chip works when the external power supply charges the power supply module and is used for cutting off the charging circuit when the charging voltage of the power supply module is larger than or equal to a first preset value, and the current limiting switch works when the power supply module supplies power to the external OTG electronic equipment and is used for cutting off the charging circuit when the output current of the power supply module is larger than or equal to a second preset value, so that the problem that the charging circuit cannot be charged is avoided.
Description
Technical Field
The utility model belongs to the technical field of protection circuits, and particularly relates to a charging management circuit and a mobile terminal.
Background
The technology (On-The-Go; OTG) allows data transfer between devices to be realized without a host, for example, a digital camera is directly connected to a printer, and a USB port between two devices is connected through The OTG technology to immediately print out a photographed picture; the data in the digital camera can also be sent to a mobile hard disk of a USB interface through OTG, and the field operation does not need to carry an expensive memory card or carry a portable computer. Through the OTG technology, can be given intelligent terminal extension USB interface accessory in order to enrich intelligent terminal's function, for example extension remote controller accessory, become omnipotent remote controller use with cell-phone, flat board.
Most of existing smart phones have an OTG function, however, a charging path of a current phone is only set by an overvoltage protection (OVP), a charging input is limited by a current, and an OTG output is limited by a platform, for example: the charging current input of the mobile phone is limited to 3A, the output requirement is limited to 1.5A, however, a single OVP chip on the charging path cannot perform bidirectional control on the charging input and the OTG output, and when the non-conventional OTG electronic equipment is used, the charging path may be damaged, so that the mobile phone cannot be charged or started.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a charging management circuit and a mobile terminal, and aims to solve the technical problems that in the prior art, a single OVP chip on a charging path of a mobile phone cannot perform bidirectional control on charging input and OTG output, and the charging path is damaged possibly when external OTG electronic equipment is used, so that the mobile phone cannot be charged or started.
In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a charging management circuit, which comprises a power module and a charging circuit, wherein the charging circuit is electrically connected with the power module, the charging circuit is used for connecting an external power supply so as to charge the power module with the external power supply, and the charging circuit is also used for connecting external OTG electronic equipment so as to supply power to the external OTG electronic equipment with the power module;
the charging circuit is provided with an overvoltage protection chip and a current-limiting switch, and the overvoltage protection chip is connected with the current-limiting switch in parallel;
the overvoltage protection chip works when the external power supply charges the power supply module and is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than or equal to a first preset value, and the current limiting switch works when the power supply module supplies power to the external OTG electronic equipment and is used for cutting off the charging circuit when the output current of the power supply module is greater than or equal to a second preset value.
In one embodiment, the overvoltage protection chip comprises a first charging pin, the power module is connected with the overvoltage protection chip, and the first charging pin is used for being electrically connected with an external power supply to connect the external power supply to the power module; the current-limiting switch comprises a second charging pin, the power module is connected with the current-limiting switch, and the second charging pin is used for being connected with external OTG electronic equipment so as to connect the external OTG electronic equipment to the power module.
In an embodiment, the overvoltage protection chip further includes a first enable pin, and the current-limiting switch further includes a second enable pin, where when the charging circuit is connected to an external power supply, the first enable pin is in an enabled state, the second enable pin is in an disabled state, and when a charging voltage of the power supply module is greater than or equal to a first preset value, the first charge pin is disconnected from the external power supply; when the charging circuit is connected with external OTG electronic equipment, the first enabling pin is in an disabled state, the second enabling pin is in an enabled state, and when the output current of the current limiting switch is greater than or equal to a second preset value, the second charging pin is disconnected with the external OTG electronic equipment.
In an embodiment, the first preset value is 13V.
In an embodiment, when the charging voltage of the power module is smaller than the first preset value, a first enable pin of the overvoltage protection chip is in an enable state, and the first charging pin is in a closed state.
In an embodiment, when the output current of the current-limiting switch is smaller than the second preset value, a second enable pin of the current-limiting switch is in an enable state, and the second charging pin is in a closed state.
In an embodiment, the second charging pin of the current limiting switch is connected to the power module through a resistor, and the resistor is an adjustable resistor.
In an embodiment, the default level of the first enable pin is a low level, and the default level of the second enable pin is a high level.
A second aspect of the present invention provides a mobile terminal comprising a charging management circuit as described above.
In an embodiment, the mobile terminal is a mobile phone.
The charging management circuit provided by the utility model comprises a power supply module and a charging circuit, wherein the charging circuit is electrically connected with the power supply module and is used for connecting an external power supply or external OTG electronic equipment, an overvoltage protection chip and a current limiting switch are arranged on the power supply charging circuit, the overvoltage protection chip is connected with the current limiting switch in parallel, the overvoltage protection chip is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than a first preset value, the current limiting switch is used for cutting off the charging circuit when the output current of the external OTG electronic equipment connected with the power supply module is greater than a second preset value, the charging management circuit limits the voltage of the input of the charging circuit through the overvoltage protection chip when the power supply module is charged so as to prevent the charging circuit from being damaged by high voltage, the current limiting switch limits the output of the charging circuit when the power supply module is externally connected with the OTG electronic equipment, and avoids the possibility of damaging the charging circuit when the OTG electronic equipment which is not conventional is used, resulting in a problem that the charging circuit cannot be charged.
The mobile terminal provided by the utility model comprises the charging management circuit, the charging management circuit limits the voltage of the input of the charging circuit through the overvoltage protection chip when the power module is charged so as to prevent the input of the charging circuit from being damaged by high voltage, and limits the current of the output of the charging circuit through the current limiting switch when the power module is externally connected with the output of OTG electronic equipment, so that the problem that the charging circuit is damaged possibly when the unconventional OTG equipment is used, and the mobile terminal cannot be charged or started is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging management circuit according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-a power supply module;
2-a charging circuit;
3-an external power supply;
4-external OTG electronics;
21-overvoltage protection chip;
22-a current limit switch;
211-a first charging pin;
212-first enable pin;
221-a second charging pin;
222-a second enable pin;
223-resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, in the present application, unless otherwise expressly specified or limited, the terms "connected," "secured," "mounted," and the like are to be construed broadly, such as to encompass both mechanical and electrical connections; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating between two elements or for interacting between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the present application may be understood by those skilled in the art according to specific situations.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The following describes the charging management circuit and the mobile terminal provided by the present invention in detail with reference to specific embodiments.
Fig. 1 is a schematic structural diagram of a charging management circuit according to an embodiment of the present invention, please refer to fig. 1, where the embodiment provides a charging management circuit, the charging management circuit includes a power module 1 and a charging circuit 2, the charging circuit 2 is electrically connected to the power module 1, the charging circuit 2 is configured to connect an external power supply 3 so that the external power supply 3 charges the power module 1, and the charging circuit is further configured to connect an external OTG electronic device 4 so that the power module 1 supplies power to the external OTG electronic device 4;
the charging circuit 2 is provided with an overvoltage protection chip 21 and a current limiting switch 22, and the overvoltage protection chip 21 is connected with the current limiting switch 22 in parallel;
the overvoltage protection chip 21 works when the external power supply 3 charges the power supply module 1, and is configured to cut off the charging circuit 2 when the charging voltage of the power supply module 1 is greater than or equal to a first preset value, and the current limiting switch 22 works when the power supply module 1 supplies power to the external OTG electronic device 4, and is configured to cut off the charging circuit 2 when the output current of the power supply module 1 is greater than or equal to a second preset value.
The charging management circuit in this embodiment can be applied to mobile terminals, such as mobile phones, ipads, and other mobile terminals.
When the charging management circuit of the embodiment is applied to a mobile phone, the overvoltage protection chip 21 is often matched with a lithium battery charging chip to provide stable output voltage for the lithium battery charging chip, and meanwhile, the power supply is stable, so that the power module 1 is protected from being affected by the charging circuit and input faults. The overvoltage protection chip 21 continuously monitors the input voltage and the battery voltage, the working principle of the device is similar to that of a linear voltage regulator, the overvoltage protection chip 21 disconnects the power module 1 from the external power supply 3 when the input voltage exceeds a threshold voltage, the threshold voltage is a first preset value in the embodiment, and a technician can preset the first preset value in advance. The current limiting switch 22 of this embodiment is a switch with a current limiting function, and when the current exceeds the rated current, the switch will automatically turn off within a certain time to prevent the charging circuit 2 from overloading, and the rated current is the second preset value in this embodiment, and the technician can preset the second preset value in advance.
The charging management circuit of the embodiment is a charging control and protection circuit on the charging circuit, for example, when the power adapter charges a mobile phone, the overvoltage protection chip 21 plays an overvoltage protection role; when the mobile phone (as host) is connected to the external OTG electronic device 4, the current limit switch 22 plays a role of outputting current limit. Under the condition that the mobile phone platform does not perform output current limiting, bidirectional control over large-current charging input and small-current output of the external OTG electronic equipment 4 is achieved, and using risks of the external OTG electronic equipment 4 are avoided.
The charging management circuit of the embodiment comprises a power supply module and a charging circuit, wherein the charging circuit is electrically connected with the power supply module, the charging circuit is used for connecting an external power supply or external OTG electronic equipment, an overvoltage protection chip and a current limiting switch are arranged on the power supply charging circuit, the overvoltage protection chip is connected with the current limiting switch in parallel, the overvoltage protection chip is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than a first preset value, the current limiting switch is used for cutting off the charging circuit when the output current of the external OTG electronic equipment connected with the power supply module is greater than a second preset value, the charging management circuit limits the voltage of the input of the charging circuit through the overvoltage protection chip when the power supply module is charged, so that the charging circuit is prevented from being damaged by high voltage, the current of the output of the charging circuit is limited through the current limiting switch when the power supply module is output by the external OTG electronic equipment, and the damage of the charging circuit caused by using the non-conventional OTG equipment is avoided, the problem that the mobile phone cannot be charged or started is caused.
In a specific embodiment, the overvoltage protection chip 21 includes a first charging pin 211, the power module 1 is connected to the overvoltage protection chip 21, and the first charging pin 211 is used for electrically connecting to the external power supply 3 to connect the external power supply 3 to the power module 1; the current limiting switch 22 includes a second charging pin 221, the power module 1 is connected to the current limiting switch 22, and the second charging pin 221 is used for connecting to the external OTG electronic device 4, so as to connect the external OTG electronic device 4 to the power module 1.
Specifically, the overvoltage protection chip 21 further includes a first enable pin 212, and the current limiting switch 22 further includes a second enable pin 222, where when the charging circuit 2 is connected to the external power supply 3, the first enable pin 212 is in an enabled state, the second enable pin 222 is in an disabled state, and when the charging voltage of the power supply module 1 is greater than or equal to a first preset value, the first charge pin 211 is disconnected from the external power supply 3; when the charging circuit 2 is connected to the external OTG electronic device 4, the first enable pin 212 is in an disabled state, the second enable pin 222 is in an enabled state, and when the output current of the current limiting switch 22 is greater than or equal to a second preset value, the second charging pin 221 is disconnected from the external OTG electronic device 4.
When the charging management circuit of this embodiment is applied to a mobile phone, the first charging pin 211 is a pin for setting an overvoltage protection voltage for a chip, and is an internal mechanism of the chip, when the first charging pin 211 is closed, the protection voltage set is 13V, when the charging circuit 2 is connected to the external power supply 3, the first enabling pin 212 is in an enabling state, the charging path is on, the second enabling pin 222 is in an disabling state at this time, the whole charging circuit 2 is in a charging state of the power module 1, and when the voltage of the overvoltage protection chip 21 is greater than or equal to 13V in this embodiment, the first charging pin 211 is disconnected from the external power supply 3.
When the charging circuit 2 is connected to the external OTG electronic device 4, the first enable pin 212 is in an disabled state, the second enable pin 222 is in an enabled state, the current-limiting switch 22 is turned on, and when the output current of the current-limiting switch 22 is greater than or equal to a second preset value, the second charging pin 221 is disconnected from the external OTG electronic device 4.
Further, the second charging pin 221 of the current limiting switch 22 is connected to the power module 1 through a resistor 223, and the resistor 223 is an adjustable resistor. In this embodiment, the adjustable resistor is arranged, and the size of the second preset value can be adjusted by adjusting the size of the adjustable resistor 223, for example, in this embodiment, the output load current of the current limiting switch 22 is controlled by the resistor 223 (when the resistor is 1.5K, the current is limited to 1.5A), the power module 1 charges the external OTG electronic device 4, and the limit of the output current is up to 1.5A. The charging management circuit realizes bidirectional control over large-current charging input and small-current output of the external OTG electronic equipment under the condition that the mobile phone platform does not perform output current limiting, and avoids the risk of machine oscillation caused by large current pumping of the external OTG electronic equipment.
In this embodiment, when the charging voltage of the power module 1 is smaller than the first preset value, the first enable pin 212 of the overvoltage protection chip 21 is in an enable state, and the first charging pin 211 is in a closed state. When the output current of the current limiting switch 22 is smaller than the second preset value, the second enable pin 221 of the current limiting switch 22 is in an enable state, and the second charging pin 222 is in a closed state.
In this embodiment, the default level of the first enable pin 212 is low, and the default level of the second enable pin 222 is high.
The charging management circuit provided by the embodiment of the utility model comprises a power supply module and a charging circuit, wherein the charging circuit is electrically connected with the power supply module, the charging circuit is used for connecting an external power supply or external OTG electronic equipment, an overvoltage protection chip and a current limiting switch are arranged on the power supply charging circuit, the overvoltage protection chip is connected with the current limiting switch in parallel, the overvoltage protection chip is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than a first preset value, the current limiting switch is used for cutting off the charging circuit when the output current of the external OTG electronic equipment connected with the power supply module is greater than a second preset value, the charging management circuit limits the voltage of the input of the charging circuit through the overvoltage protection chip when the power supply module is charged, so that the charging circuit is prevented from being damaged by high voltage, the current limiting switch limits the output of the charging circuit when the external OTG electronic equipment connected with the power supply module is output, and avoids the possibility of damaging the charging circuit when the non-conventional OTG electronic equipment is used, the problem that the mobile phone cannot be charged or started is caused.
A second aspect of the embodiments of the present invention provides a mobile terminal, where the mobile terminal includes the charging management circuit according to the above embodiments.
For example: the charging management circuit comprises a power supply module and a charging circuit, wherein the charging circuit is electrically connected with the power supply module, the charging circuit is used for connecting an external power supply so as to enable the external power supply to charge the power supply module, and the charging circuit is also used for connecting external OTG electronic equipment so as to enable the power supply module to supply power to the external OTG electronic equipment;
the charging circuit is provided with an overvoltage protection chip and a current-limiting switch, and the overvoltage protection chip is connected with the current-limiting switch in parallel;
the overvoltage protection chip works when the external power supply charges the power supply module and is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than or equal to a first preset value, and the current limiting switch works when the power supply module supplies power to the external OTG electronic equipment and is used for cutting off the charging circuit when the output current of the power supply module is greater than or equal to a second preset value.
In a specific embodiment, the mobile terminal is a mobile phone. When the charging management circuit is applied to a mobile phone, the charging management circuit is used as a charging control and protection circuit on a charging circuit, and when a power adapter charges the mobile phone, an overvoltage protection chip plays an overvoltage protection role; when the mobile phone (as host) is connected with external OTG electronic equipment, the current limiting switch plays a role in outputting current limit. Under the condition that the mobile phone platform does not perform output current limiting, bidirectional control over large-current charging input and small-current output of external OTG electronic equipment is achieved, and using risks of the external OTG electronic equipment are avoided.
The mobile terminal provided by the utility model comprises the charging management circuit, the charging management circuit limits the voltage of the input of the charging circuit through the overvoltage protection chip when the power module is charged so as to prevent the input of the charging circuit from being damaged by high voltage, and limits the current of the output of the charging circuit through the current limiting switch when the power module is externally connected with the output of OTG electronic equipment, so that the problem that the charging circuit is damaged possibly when the unconventional OTG equipment is used, and a mobile phone cannot be charged or started is avoided.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A charge management circuit, comprising:
the power supply module is electrically connected with the charging circuit, the charging circuit is used for connecting an external power supply to enable the external power supply to charge the power supply module, and the charging circuit is also used for connecting external OTG electronic equipment to enable the power supply module to supply power to the external OTG electronic equipment;
the charging circuit is provided with an overvoltage protection chip and a current-limiting switch, and the overvoltage protection chip is connected with the current-limiting switch in parallel;
the overvoltage protection chip works when the external power supply charges the power supply module and is used for cutting off the charging circuit when the charging voltage of the power supply module is greater than or equal to a first preset value, and the current limiting switch works when the power supply module supplies power to the external OTG electronic equipment and is used for cutting off the charging circuit when the output current of the power supply module is greater than or equal to a second preset value.
2. The charge management circuit of claim 1, wherein: the overvoltage protection chip comprises a first charging pin, the power supply module is connected with the overvoltage protection chip, and the first charging pin is used for being electrically connected with an external power supply so as to connect the external power supply to the power supply module; the current-limiting switch comprises a second charging pin, the power module is connected with the current-limiting switch, and the second charging pin is used for being connected with external OTG electronic equipment so as to connect the external OTG electronic equipment to the power module.
3. The charge management circuit of claim 2, wherein: the overvoltage protection chip further comprises a first enabling pin, the current limiting switch further comprises a second enabling pin, when the charging circuit is connected to an external power supply, the first enabling pin is in an enabling state, the second enabling pin is in a non-enabling state, and when the charging voltage of the power supply module is greater than or equal to a first preset value, the first charging pin is disconnected with the external power supply; when the charging circuit is connected with external OTG electronic equipment, the first enabling pin is in an disabled state, the second enabling pin is in an enabled state, and when the output current of the current limiting switch is greater than or equal to a second preset value, the second charging pin is disconnected with the external OTG electronic equipment.
4. The charge management circuit of claim 3, wherein: the first preset value is 13V.
5. The charge management circuit of claim 3, wherein: when the charging voltage of the power supply module is smaller than the first preset value, a first enabling pin of the overvoltage protection chip is in an enabling state, and the first charging pin is in a closed state.
6. The charge management circuit of claim 3, wherein: when the output current of the current limiting switch is smaller than the second preset value, a second enabling pin of the current limiting switch is in an enabling state, and a second charging pin is in a closed state.
7. The charge management circuit according to any one of claims 3 to 6, wherein: and a second charging pin of the current limiting switch is connected with the power supply module through a resistor, and the resistor is an adjustable resistor.
8. The charge management circuit of claim 7, wherein: the default level of the first enabling pin is low level, and the default level of the second enabling pin is high level.
9. A mobile terminal, characterized by: the mobile terminal comprises the charge management circuit of any of claims 1-8.
10. The mobile terminal of claim 9, wherein: the mobile terminal is a mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121786344.1U CN215990253U (en) | 2021-08-02 | 2021-08-02 | Charging management circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121786344.1U CN215990253U (en) | 2021-08-02 | 2021-08-02 | Charging management circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215990253U true CN215990253U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121786344.1U Active CN215990253U (en) | 2021-08-02 | 2021-08-02 | Charging management circuit and mobile terminal |
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|---|---|
| CN (1) | CN215990253U (en) |
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2021
- 2021-08-02 CN CN202121786344.1U patent/CN215990253U/en active Active
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