CN213185551U - OTG and isolation circuit and mobile terminal charge - Google Patents
OTG and isolation circuit and mobile terminal charge Download PDFInfo
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- CN213185551U CN213185551U CN202021716961.XU CN202021716961U CN213185551U CN 213185551 U CN213185551 U CN 213185551U CN 202021716961 U CN202021716961 U CN 202021716961U CN 213185551 U CN213185551 U CN 213185551U
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Abstract
The utility model provides an OTG and isolation circuit and mobile terminal charge relates to electronic circuit technical field, and this circuit includes: the device comprises an OTG power supply unit, a charging isolation unit and a USB interface, wherein the USB interface is used for connecting OTG equipment into a circuit and comprises a first port and a second port; the OTG power supply unit is connected with the first port and used for supplying power to the OTG equipment; the second port is connected with the charging isolation unit and used for isolating the OTG power supply unit from the charging base; the charging base is used for charging the mobile terminal, and the OTG power supply and the charging isolation are realized simultaneously by a simple structure, so that the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit technique and specifically relates to an isolation circuit and mobile terminal charge based on OTG is related to.
Background
The Universal Serial Bus (USB) is an emerging data communication method that gradually replaces other interface standards, and the development of USB technology has enabled PCs and peripheral devices to connect devices of various data transmission speeds in a simple manner and at moderate manufacturing cost. In recent years, OTG (On-The-Go) functions based On mobile devices have been widely used, and are mainly applied to connection between various devices or mobile devices to exchange data.
However, most of the existing mobile devices are usually provided with only one USB interface, if the OTG function and the charging function are to work simultaneously, a charging base needs to be added, and the charging IC supporting both charging and OTG power supply is very expensive. That is, the electrical isolation circuit in the conventional mobile device has a problem of high cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an OTG and isolation circuit charges to alleviate the higher technical problem of two-way charging IC cost among the prior art.
In a first aspect, the embodiment of the utility model provides a OTG and isolation circuit that charges is applied to mobile terminal, include: the device comprises an OTG power supply unit, a charging isolation unit and a USB interface;
the USB interface is used for connecting OTG equipment into a circuit, and comprises a first port and a second port;
the OTG power supply unit is connected with the first port and used for supplying power to the OTG equipment;
the second port is connected with the charging isolation unit and used for isolating the OTG power supply unit from the charging base; the charging base is used for charging the mobile terminal.
In some embodiments, the OTG power supply unit includes a power load switch, and the power load switch is connected to the charging isolation unit and the first port, respectively, and is configured to control the OTG power supply unit to supply power to the OTG device.
In some embodiments, the charge isolation unit comprises an OTG isolation subunit and a charge isolation subunit; the OTG isolation subunit is respectively connected with the second port of the USB interface and the OTG power supply unit; the charging isolation subunit is connected with the charging base at the second port of the USB interface respectively.
In some embodiments, the OTG isolation subcell includes a first field effect transistor and first and second voltage dividing resistors.
In some embodiments, the gate G of the first fet is connected to the second port of the USB interface, the source S of the first fet is grounded, and the drain D of the first fet is connected to one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor, and the OTG power supply unit.
In some embodiments, the charge isolation subunit comprises: PNP triode, NPN triode, second field effect transistor and third field effect transistor.
In some embodiments, the base B of the PNP triode is connected to the second port of the USB interface; a collector C of the PNP triode is connected with a base B of the NPN triode; an emitter E of the PNP triode is grounded; a collector C of the NPN triode is connected with the second field effect transistor; and the emitter E of the NPN triode is grounded.
In some embodiments, the gate G of the second fet is connected to the collector C of the NPN transistor, and the drain D of the second fet is connected to the drain D of the third fet; and a grid G of the third field effect transistor is connected with a collector C of the NPN triode, and a source S of the third field effect transistor is connected with the charging base.
In some embodiments, the charge isolation subunit further comprises: a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with a collector C of the PNP triode, and the other end of the first resistor is grounded; one end of the second resistor is connected with a base electrode B of the NPN triode, and the other end of the second resistor is connected with a source electrode S of the second field effect transistor; one end of the third resistor is connected with the source S of the second field effect transistor, and the other end of the third resistor is connected with the collector C of the NPN triode.
In a second aspect, an embodiment of the present invention provides a mobile terminal, including a power management system and an OTG and a charging isolation circuit as in any one of the embodiments of the first aspect.
The utility model provides an OTG and isolation circuit that charges, this circuit includes: the device comprises an OTG power supply unit, a charging isolation unit and a USB interface, wherein the USB interface is used for connecting OTG equipment into a circuit and comprises a first port and a second port; the OTG power supply unit is connected with the first port and used for supplying power to the OTG equipment; the second port is connected with the charging isolation unit and used for isolating the OTG power supply unit from the charging base; the charging base is used for charging the mobile terminal. The circuit realizes OTG power supply and charging isolation with a simple structure, and reduces cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an OTG and a charging isolation circuit provided in an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a connection between an OTG and a charging isolation circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit connection of a mobile terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
USB is an emerging data communication method that gradually replaces other interface standards, and the development of USB technology has enabled PCs and peripheral devices to connect devices of various data transfer speeds together in a simple manner and at moderate manufacturing cost. In recent years, OTG (On-The-Go) functions based On mobile devices have been widely used, and are mainly applied to connection between various devices or mobile devices to exchange data. However, most of the existing mobile devices are usually provided with only one USB interface, if the OTG function and the charging function are to work simultaneously, a charging base needs to be added, and the charging IC supporting both charging and OTG power supply is very expensive. That is, the electrical isolation circuit in the conventional mobile device has a problem of high cost.
Based on this, the embodiment of the utility model provides a OTG and isolation circuit charges alleviates the higher technical problem of two-way charging IC cost among the prior art.
For the understanding of the present embodiment, the embodiment of the present invention will be described with reference to fig. 1 to 4.
It is at first right the utility model discloses the disclosed OTG of embodiment and the isolation circuit that charges introduces in detail, refer to the structural schematic diagram of the shown OTG of figure 1 and the isolation circuit that charges, this circuit includes: an OTG power supply unit 110, a charging isolation unit 120, and a USB interface 130;
the USB interface 130 is used for connecting the OTG device to the circuit, and the USB interface 130 includes a first port and a second port; the OTG power supply unit 110 is connected to the first port, and the OTG power supply unit 110 is configured to supply power to the OTG device; the second port is connected to the charging isolation unit 120, and is used for isolating the OTG power supply unit 110 from the charging base 140; the charging dock 140 is used to charge the mobile terminal.
The charging isolation unit 120 may include an OTG isolation subunit and a charging isolation subunit; the OTG isolation subunit is connected to the second port of the USB interface 130 and the OTG power supply unit 110 respectively; the charging isolation subunit is connected to the second port of the USB interface 130 and the charging base 140 respectively.
The OTG isolation subunit may include a first field effect transistor and first and second voltage dividing resistors. Referring to fig. 2, as a specific example, a gate G of a first fet Q4 is connected to the second port of the USB interface 130, a source S of the first fet Q4 is grounded, and a drain D of the first fet Q4 is connected to one end of the first voltage-dividing resistor R4, one end of the second voltage-dividing resistor R5, and the OTG power supply unit 110.
The charging isolation subunit may include: PNP triode, NPN triode, second field effect transistor and third field effect transistor.
As a specific example, the base B of the PNP transistor Q3 is connected to the second port of the USB interface 130; the collector C of the PNP triode Q3 is connected with the base B of the NPN triode Q5; the emitter E of the PNP triode Q3 is grounded; the collector C of the NPN triode Q5 is connected with the second field-effect transistor Q1; the emitter E of the NPN transistor Q5 is grounded.
The grid G of the second field effect transistor Q1 is connected with the collector C of the NPN triode Q5, and the drain D of the second field effect transistor Q1 is connected with the drain D of the third field effect transistor Q2; the gate G of the third fet Q2 is connected to the collector C of the NPN transistor Q5, and the source S of the third fet Q2 is connected to the charging base 140.
In addition, the charging isolation subunit may further include: a first resistor R1, a second resistor R2 and a third resistor R3; one end of the first resistor is connected with a collector C of the PNP triode Q3, and the other end of the first resistor is grounded;
one end of the second resistor is connected with a base electrode B of the NPN triode Q5, and the other end of the second resistor is connected with a source electrode S of the second field effect transistor; one end of the third resistor is connected with the source electrode S of the second field effect transistor, and the other end of the third resistor is connected with the collector electrode C of the NPN triode Q5.
In one embodiment, the OTG power supply unit 110 includes a power load switch, and the power load switch is respectively connected to the charging isolation unit 120 and the first port, and is configured to control the OTG power supply unit 110 to supply power to the OTG device.
The embodiment of the application provides an electric isolation circuit with low cost and simple logic to realize the function of simultaneous work of OTG and base charging. When the Micro-USB interface is plugged into the OTG device, the USB-ID is pulled to a low level from a default high level, the system recognizes that QTG equipment is plugged in, and the mode is switched to a Host mode; the grid of the NMOS tube Q4 uses the USB _ ID as a control pin, when the OTG equipment is inserted, the high level is changed into the low level, the MOS tube is turned off, the load switch EN is pulled high after VCC-5V is subjected to voltage division through R4 and R5, and the power supply of the OTG equipment is completed; when the Micro-USB interface is inserted into an OTG device, the USB-ID is pulled to a low level from a default high level, the PNP triode Q3 is conducted, the base electrode of the NPN triode Q5 is pulled down by the Q3, the triode is in a cut-off state, the grids of the PMOS tubes Q1 and Q2 are pulled up by the pull-up resistor R3, and the PMOS tubes Q1 and Q2 are in a cut-off state, so that mutual isolation of power supply of the charging base 140 and power supply of the OTG is achieved, and the two functions can be used simultaneously.
The OTG is identified by using a simple triode and MOS tube scheme; the power supply and the charging function are simultaneously used for electrical isolation, the triode and the MOS tube are very common transistor devices in the electronic industry, the manufacturing process is simple, and the production process of the corresponding IC and equipment is correspondingly simple and stable. Compared with an IC scheme, the android terminal CPU needs to pay more GPIOs for control, and software driving manpower is consumed for debugging. The logic circuits of the scheme are all hardware switching logic circuits, and are automatically identified and judged through the type of equipment inserted into the Micro-USB interface, and an additional GPIO is not needed to be used as an identification control means.
The embodiment of the utility model provides a still provide a mobile terminal, including power management system and above-mentioned arbitrary implementation mode OTG and charging isolation circuit. The mobile terminal can be an electronic terminal such as a mobile phone, a tablet, a game machine and the like which can be provided with an android system.
As a specific example, referring to fig. 3 to 4, the mobile terminal includes: a power management system 210, an OTG power supply unit 110, a charging isolation unit 120, and a USB interface 130. The power management system 210 is connected to the USB interface 130, the charging isolation unit 120, and the charging base 140.
The utility model provides an OTG and isolation circuit and mobile terminal charge, this circuit includes: the OTG charging system comprises an OTG power supply unit 110, a charging isolation unit 120 and a USB interface 130, wherein the USB interface 130 is used for connecting an OTG device into a circuit and comprises a first port and a second port; the OTG power supply unit 110 is connected to the first port and configured to supply power to the OTG device; the second port is connected to the charging isolation unit 120, and is used for isolating the OTG power supply unit 110 from the charging base 140; the charging dock 140 is used to charge the mobile terminal. The OTG power supply and charging isolation are realized simultaneously by a simple structure, and the cost is reduced.
It should be noted that: like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an OTG and isolation circuit that charges, is applied to mobile terminal, its characterized in that includes: the device comprises an OTG power supply unit, a charging isolation unit and a USB interface;
the USB interface is used for connecting OTG equipment into a circuit, and comprises a first port and a second port;
the OTG power supply unit is connected with the first port and used for supplying power to the OTG equipment;
the second port is connected with the charging isolation unit and used for isolating the OTG power supply unit from the charging base; the charging base is used for charging the mobile terminal.
2. The OTG and charging isolation circuit of claim 1,
the OTG power supply unit comprises a power load switch, and the power load switch is respectively connected with the charging isolation unit and the first port and used for controlling the OTG power supply unit to supply power to the OTG equipment.
3. The OTG and charging isolation circuit of claim 1,
the charging isolation unit comprises an OTG isolation subunit and a charging isolation subunit;
the OTG isolation subunit is respectively connected with the second port of the USB interface and the OTG power supply unit;
the charging isolation subunit is connected with the second port of the USB interface and the charging base respectively.
4. The OTG and charging isolation circuit of claim 3,
the OTG isolation subunit comprises a first field effect tube, a first voltage division resistor and a second voltage division resistor.
5. The OTG and charging isolation circuit of claim 4,
the grid G of the first field effect transistor is connected with the second port of the USB interface, the source S of the first field effect transistor is grounded, and the drain D of the first field effect transistor is connected with one end of the first voltage-dividing resistor, one end of the second voltage-dividing resistor and the OTG power supply unit.
6. The OTG and charging isolation circuit of claim 3,
the charge isolation subunit includes: PNP triode, NPN triode, second field effect transistor and third field effect transistor.
7. The OTG and charging isolation circuit of claim 6,
the base electrode B of the PNP triode is connected with the second port of the USB interface; a collector C of the PNP triode is connected with a base B of the NPN triode; an emitter E of the PNP triode is grounded;
a collector C of the NPN triode is connected with the second field effect transistor; and the emitter E of the NPN triode is grounded.
8. The OTG and charging isolation circuit of claim 7,
a grid electrode G of the second field effect transistor is connected with a collector electrode C of the NPN triode, and a drain electrode D of the second field effect transistor is connected with a drain electrode D of the third field effect transistor;
and a grid G of the third field effect transistor is connected with a collector C of the NPN triode, and a source S of the third field effect transistor is connected with the charging base.
9. The OTG and charging isolation circuit of claim 6, wherein the charging isolation subunit further comprises: a first resistor, a second resistor and a third resistor;
one end of the first resistor is connected with a collector C of the PNP triode, and the other end of the first resistor is grounded;
one end of the second resistor is connected with a base electrode B of the NPN triode, and the other end of the second resistor is connected with a source electrode S of the second field effect transistor;
one end of the third resistor is connected with the source S of the second field effect transistor, and the other end of the third resistor is connected with the collector C of the NPN triode.
10. A mobile terminal comprising a power management system and an OTG and charging isolation circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021716961.XU CN213185551U (en) | 2020-08-17 | 2020-08-17 | OTG and isolation circuit and mobile terminal charge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021716961.XU CN213185551U (en) | 2020-08-17 | 2020-08-17 | OTG and isolation circuit and mobile terminal charge |
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| CN213185551U true CN213185551U (en) | 2021-05-11 |
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| CN202021716961.XU Active CN213185551U (en) | 2020-08-17 | 2020-08-17 | OTG and isolation circuit and mobile terminal charge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115391258A (en) * | 2022-08-16 | 2022-11-25 | 云码智能(海南)科技有限公司 | Interface management circuit, method, apparatus, device, storage medium, and program product |
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2020
- 2020-08-17 CN CN202021716961.XU patent/CN213185551U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115391258A (en) * | 2022-08-16 | 2022-11-25 | 云码智能(海南)科技有限公司 | Interface management circuit, method, apparatus, device, storage medium, and program product |
| CN115391258B (en) * | 2022-08-16 | 2023-05-02 | 云码智能(海南)科技有限公司 | Interface management circuit, method, apparatus, device, storage medium, and program product |
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