CN211264303U - Intelligent module and USB2.0 switching circuit thereof - Google Patents
Intelligent module and USB2.0 switching circuit thereof Download PDFInfo
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- CN211264303U CN211264303U CN201922456100.6U CN201922456100U CN211264303U CN 211264303 U CN211264303 U CN 211264303U CN 201922456100 U CN201922456100 U CN 201922456100U CN 211264303 U CN211264303 U CN 211264303U
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Abstract
The utility model discloses an intelligent module and a USB2.0 switching circuit thereof, wherein the circuit comprises a switching unit, an Ethernet communication unit, an electric signal acquisition unit and a USB interface unit; the first input end of the switching unit is connected with the USB data end of the intelligent module, the first output end of the switching unit is connected with the Ethernet communication unit, and the second output end of the switching unit is connected with the USB interface unit; one end of the electric signal acquisition unit is connected with the mode control end of the intelligent module, the other end of the electric signal acquisition unit is connected with the control input end of the switching unit, and the electric signals at the two ends are consistent; when the USB interface unit is not connected with the external equipment, the first input end is electrically connected with the first output end; when the USB interface unit is connected with the external equipment, the first input end is switched to be electrically connected with the second output end. The utility model discloses a when USB interface and ethernet communication and have the USB master to insert, automatic identification and switching USB interface communicate with the USB master, have widened interface application range and utilization efficiency.
Description
Technical Field
The utility model relates to a circuit design technical field, in particular to intelligent module and USB2.0 (universal serial bus) switching circuit thereof.
Background
The USB interface is a popular computer application interface, most mobile devices communicate with a PC (personal computer) through the USB interface, and more electronic products relate to the USB interface. USB has incomparable advantages in transmission rate compared to conventional USART (universal synchronous/asynchronous serial receive/transmitter)/SPI (serial peripheral interface) serial interfaces.
When a CPU (central processing unit) or an LTE (Long Term Evolution ) intelligent module needs to implement ethernet communication, a USB to ethernet chip is generally adopted to implement high-speed and stable ethernet data transmission, and at this time, a USB interface must work in a Host mode; because the interface is limited, on the basis of realizing the communication functions of the USB and the Ethernet, if a Device mode of the USB is required to be used for communication with other main equipment such as a PC (personal computer), the port limitation cannot automatically identify and switch to realize the related functions.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an intelligent module and USB2.0 switching circuit thereof in order to overcome among the prior art when USB interface and ethernet communication, can't realize that the USB interface switches to the Device mode and by the defect of master Device visit.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a USB2.0 switching circuit of an intelligent module, wherein the USB2.0 switching circuit comprises a switching unit, an Ethernet communication unit, an electric signal acquisition unit and a USB interface unit;
the switching unit comprises a first input end, a control input end, a first output end and a second output end;
the first input end is electrically connected with the USB data end of the intelligent module, the first output end is electrically connected with the Ethernet communication unit, and the second output end is electrically connected with the USB interface unit;
one end of the electric signal acquisition unit is electrically connected with the mode control end of the intelligent module, the other end of the electric signal acquisition unit is electrically connected with the control input end, and electric signals at two ends of the electric signal acquisition unit are consistent;
when the USB interface unit is not connected with the external equipment, the mode control end of the intelligent module is at a low level, and the intelligent module is in a Host mode; at this time, the control input end of the switching unit is also at a low level, and the switching unit is used for electrically connecting the first input end with the first output end;
when the USB interface unit is connected to the external Device, the mode control end of the intelligent module is at a high level, and the intelligent module is in a Device mode; at this time, the control input end of the switching unit is also at a high level, and the switching unit is configured to switch the first input end to be electrically connected with the second output end.
Preferably, the ethernet communication unit includes a USB-to-ethernet unit, and the first output terminal of the switching unit is electrically connected to the USB-to-ethernet unit;
when the output voltage of the external battery is inconsistent with the power supply voltage of the USB-to-Ethernet unit, the Ethernet communication unit further comprises a voltage conversion unit;
one end of the voltage conversion unit is electrically connected with a voltage pin of the intelligent module and the external battery respectively, and the external battery is used for supplying power to the voltage conversion unit and the intelligent module;
the voltage conversion unit is used for performing voltage conversion on the first voltage input by the external battery to obtain a second voltage;
the voltage conversion unit is also electrically connected with the USB-to-Ethernet unit and is used for supplying power to the USB-to-Ethernet unit.
Preferably, the electric signal acquisition unit further comprises a first resistor; one end of the first resistor is electrically connected with a power supply end, and the other end of the first resistor is electrically connected with a first general input/output (IO) end and the mode control end of the intelligent module; the voltage detection end of the intelligent module is electrically connected with the USB interface unit;
a second general IO end of the intelligent module is electrically connected with the voltage conversion unit; when the USB interface unit is not connected to the external device, a second general IO end of the intelligent module is at a high level, and the intelligent module is used for triggering the voltage conversion unit to convert;
when the voltage detection end of the intelligent module does not detect that the USB interface unit inputs a preset voltage value, the first general IO end is at a low level, the second general IO end is at a high level, meanwhile, the mode control end is pulled down to be at the low level, and the control end of the voltage conversion unit is at the high level;
when the voltage detection end of the intelligent module detects that the USB interface unit inputs the preset voltage value, the first general IO end is at a high level, the second general IO end is at a low level, meanwhile, the mode control end is pulled up to be at the high level, and the control end of the voltage conversion unit is at the low level.
Preferably, the electric signal acquisition unit further includes a first triode, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor;
the USB interface unit is electrically connected with one end of the fourth resistor, one end of the sixth resistor and one end of the seventh resistor, the other end of the fourth resistor is grounded, the other end of the sixth resistor is electrically connected with the base electrode of the second triode, and the other end of the seventh resistor is electrically connected with the base electrode of the first triode;
an emitting electrode of the second triode is grounded, a collector electrode of the second triode is electrically connected with one end of the fifth resistor and the control end of the voltage conversion unit, and the other end of the fifth resistor is electrically connected with a power supply end;
an emitting electrode of the first triode is electrically connected with one end of the third resistor, the mode control end of the intelligent module and the control input end of the switching unit, the other end of the third resistor is grounded, a collecting electrode of the first triode is electrically connected with one end of the second resistor, and the other end of the second resistor is electrically connected with the power supply end;
the voltage detection end of the intelligent module is electrically connected with the USB interface unit; when the voltage detection end of the intelligent module does not detect that the USB interface unit inputs a preset voltage value, the first triode and the second triode are both cut off, the mode control end of the intelligent module keeps a low level, and the control end of the voltage conversion unit keeps a high level;
when the voltage detection end of the intelligent module detects that the USB interface unit inputs a preset voltage value, the first triode and the second triode are both conducted, the mode control end of the intelligent module is at a high level, and the control end of the voltage conversion unit is at a low level.
Preferably, the first input terminal includes a first input pin and a second input pin, the first output terminal includes a first output pin and a second output pin, and the second output terminal includes a third output pin and a fourth output pin;
the first input pin is electrically connected with a USB positive data end of the USB data end, and the second input pin is electrically connected with a USB negative data end of the USB data end;
the first output pin and the second output pin are both electrically connected with the USB-to-Ethernet unit;
the third output pin and the fourth output pin are electrically connected with the USB interface unit.
Preferably, the ethernet communication unit further comprises a storage unit;
the storage unit is electrically connected with the USB-to-Ethernet unit and is used for storing data generated by the USB-to-Ethernet unit in the Ethernet communication process.
Preferably, the ethernet communication unit further comprises a network transformer;
the network transformer is electrically connected with the USB-to-Ethernet unit;
and the network transformer is used for coupling the electric signals sent by the USB-to-Ethernet unit.
Preferably, the switching unit includes a high-speed switch.
The utility model also provides an intelligent module, intelligent module includes aforementioned USB2.0 switching circuit.
Preferably, the intelligent module comprises a CPU or an LTE intelligent module.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The utility model discloses an actively advance the effect and lie in: the utility model discloses a high speed switch divides the USB interface into two, on the basis of USB interface and ethernet interface communication, when USB interface unit inserts USB main equipment, the USB main equipment of automatic identification access switches the USB interface to the Device mode, switch to the USB interface and be connected with male USB main equipment, realize the communication between USB interface and the USB main equipment, realize USB under the limited interface condition and change the automatic switch-over of Ethernet and USB communication function, the application range and the utilization efficiency of interface have been widened.
Drawings
Fig. 1 is a schematic structural diagram of a USB2.0 switching circuit according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a USB2.0 switching circuit according to embodiment 2 of the present invention.
Fig. 3 is a schematic structural diagram of a USB2.0 switching circuit according to embodiment 3 of the present invention.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment provides a USB2.0 switching circuit of an intelligent module, as shown in fig. 1, the switching circuit includes a switching unit 1, an ethernet communication unit 2, an electrical signal acquisition unit 3, and a USB interface unit 4, and the switching circuit is electrically connected to an intelligent module 5.
The switching unit 1 comprises a first input end, a control input end, a first output end and a second output end; the first input end is electrically connected with the USB data end of the intelligent module 5, the first output end is electrically connected with the Ethernet communication unit 2, and the second output end is electrically connected with the USB interface unit 4.
One end of the electric signal acquisition unit 3 is electrically connected with the mode control end USB _ ID of the intelligent module 5, the other end of the electric signal acquisition unit 3 is electrically connected with the control input end of the switching unit 1, and the electric signal acquisition unit 3 enables the mode control end USB _ ID to be consistent with the electric signals at the two ends of the control input end.
When the USB interface unit 4 is not connected to the external device, the mode control end USB _ ID of the intelligent module 5 is at a low level, and the intelligent module 5 is in the Host mode; at this time, the control input end of the switching unit 1 is the same as the electrical signal of the mode control end USB _ ID, and is also at a low level, and the switching unit 1 is configured to electrically connect the first input end and the first output end, that is, connect the USB data end of the intelligent module 5 with the ethernet communication unit 2, so as to implement communication between the USB interface of the intelligent module and the ethernet.
When the USB interface unit 4 is connected to an external host USB Device, the mode control terminal USB _ ID of the intelligent module 5 is at a high level, and the intelligent module 5 is in a Device mode; at this time, the control input end of the switching unit 1 is the same as the electrical signal of the mode control end USB _ ID, and is also at a high level, and the switching unit 1 is configured to switch the first input end to be electrically connected to the second output end, that is, connect the USB data end of the intelligent module 5 to the inserted USB host Device, so as to implement communication between the USB interface and the USB host Device in the Device mode.
In the embodiment, the USB interface is divided into two parts by a high-speed switch, on the basis of communication between the USB interface and the ethernet interface, when the USB interface unit is connected to the USB host Device, the USB host Device is automatically identified and the USB interface is switched to the Device mode, and the USB interface is switched to be connected to the USB host Device, so as to implement communication between the USB interface and the USB host Device, and implement automatic switching between USB to ethernet and USB communication functions under the condition of limited interface, thereby widening the application range and utilization efficiency of the interface.
Example 2
In this embodiment, as shown in fig. 2, in the USB2.0 switching circuit of the intelligent module provided in this embodiment, the electrical signal collecting unit 3 includes a first resistor R1, and the ethernet communication unit 2 includes a USB-to-ethernet unit 21, a voltage converting unit 22, a storage unit 23, and a network transformer 24.
The voltage conversion unit 22 is electrically connected to a voltage pin VBAT of the intelligent module 5 and an external battery 6, the external battery 6 supplies power to the intelligent module 5 and the voltage conversion unit 22, the voltage conversion unit 22 is further electrically connected to the USB-to-ethernet unit 21, and a second general IO terminal of the intelligent module 5 is electrically connected to a control terminal of the voltage conversion unit 22. When the output voltage of the external battery 6 is not consistent with the power supply voltage of the USB to ethernet unit 21, the voltage conversion unit 22 performs voltage conversion on the first voltage input by the external battery 6 to obtain a second voltage, and uses the second voltage to supply power to the USB to ethernet unit 21.
One end of the first resistor R1 is electrically connected to the power supply terminal VCC, and the other end is electrically connected to the first general IO terminal of the intelligent module and the mode control terminal USB _ ID, and is electrically connected to the control input terminal of the switching unit 1. The voltage detection end USB _ VBUS of the intelligent module 5 is electrically connected to an external power pin of the USB interface unit 4, and when the USB interface unit 4 is connected to an external USB host device, the external power pin is pulled high to a high level by a 5V power provided by the external USB host device.
When the USB interface unit 4 is not connected to a PC or other USB Host device, the voltage detection terminal USB _ VBUS of the intelligent module 5 does not detect that the USB interface unit 4 inputs a preset voltage value, the intelligent module 5 defaults to set the first general IO terminal to be a low level and the second general IO terminal to be a high level, because the mode control terminal USB _ ID is connected to the first general IO terminal, the mode control terminal USB _ ID is pulled down to be a low level, at this time, the intelligent module 5 is in a Host mode, the control input terminal of the switching unit 1 electrically connected to the mode control terminal USB _ ID is also a low level, the switching unit 1 electrically connects the first input terminal to the first output terminal, that is, the USB data terminal of the intelligent module 5 is connected to the ethernet communication unit 2; meanwhile, the second general IO end is at a high level, and the control end of the voltage conversion unit 22 electrically connected to the second general IO end is also at a high level, so that the voltage conversion unit 22 performs voltage conversion to supply power to the USB-to-ethernet unit 21, thereby realizing communication between the USB interface of the intelligent module and the ethernet.
When the USB interface unit 4 is connected to a PC or other USB host Device, the voltage detection end USB _ VBUS of the intelligent module 5 detects that the USB interface unit 4 inputs a preset voltage value, the intelligent module 5 sets the first general IO end to be a high level, and the second general IO end to be a low level, because the mode control end USB _ ID is connected to the first general IO end, the mode control end USB _ ID is pulled up to be a high level, at this time, the intelligent module 5 is in a Device mode, the control input end of the switching unit 1 electrically connected to the mode control end USB _ ID is also a high level, the switching unit 1 electrically connects the first input end to the second output end, that is, the USB data end of the intelligent module 5 is connected to the USB interface unit 4, and communication between the USB interface of the intelligent module 5 and the USB host Device in the Device mode is realized; meanwhile, the second general IO terminal is at a low level, the control terminal of the voltage converting unit 22 electrically connected to the second general IO terminal is also at a low level, and the voltage converting unit 22 does not work.
The first input end of the switching unit 1 includes a first input pin and a second input pin, the first input pin is electrically connected to the USB positive data end USB _ DP of the intelligent module 5, and the second input pin is electrically connected to the USB negative data end USB _ DM of the intelligent module 5.
The first output end comprises a first output pin and a second output pin, and the first output pin and the second output pin are both electrically connected with the USB-to-Ethernet unit 21; the second output end comprises a third output pin and a fourth output pin, and the third output pin and the fourth output pin are both electrically connected with the USB interface unit 4.
The storage unit 23 is electrically connected to the USB to ethernet unit 21, and is configured to store data generated by the USB to ethernet unit 21 during ethernet communication.
The network transformer 24 is electrically connected to the USB to ethernet unit 21, and is configured to couple the electrical signal sent by the USB to ethernet unit 21.
In the embodiment, when the USB interface unit is connected to the USB host device, the 5V power provided by the USB host device is monitored, whether the USB interface unit is inserted into the USB host device is automatically identified, and then the pin state of the intelligent module is controlled, so that on the basis of communication between the USB interface and the ethernet interface, communication between the USB interface and the USB host device is realized, automatic switching between USB to ethernet and USB communication functions is realized under the condition of a limited interface, and the application range and the utilization efficiency of the interface are widened.
Example 3
In this embodiment, as shown in fig. 3, in the USB2.0 switching circuit of the intelligent module of this embodiment, the ethernet communication unit 2 includes a USB-to-ethernet unit 21, a voltage conversion unit 22, a storage unit 23, and a network transformer 24, and the electrical signal collection unit 3 includes a first triode Q1, a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.
An external power supply pin of the USB interface unit 4 is electrically connected with one end of a fourth resistor R4, one end of a sixth resistor R6 and one end of a seventh resistor R7, the other end of the fourth resistor R4 is grounded, the other end of the sixth resistor R6 is electrically connected with a base electrode of a second triode Q2, and the other end of the seventh resistor R7 is electrically connected with a base electrode of a first triode Q1;
an emitter of the second triode Q2 is grounded, a collector of the second triode Q2 is electrically connected with one end of the fifth resistor R5 and the control end of the voltage conversion unit 22, and the other end of the fifth resistor R5 is electrically connected with the power supply end VCC;
an emitter of the first triode Q1 is electrically connected with one end of the third resistor R3, the mode control end USB _ ID of the intelligent module 5 and the control input end of the switching unit 1, the other end of the third resistor R3 is grounded, a collector of the first triode Q1 is electrically connected with one end of the second resistor R2, and the other end of the second resistor R2 is electrically connected with a power supply end VCC;
a voltage detection end USB _ VBUS of the intelligent module 5 is electrically connected with an external power supply pin of the USB interface unit 4; when the USB interface unit 4 is not connected to a PC or other USB host device, the voltage detection end USB _ VBUS of the intelligent module 5 does not detect that the USB interface unit 4 inputs a preset voltage value, the external power pin of the USB interface unit 4 is at a low level, both the first triode Q1 and the second triode Q2 are turned off, the emitter of the first triode Q1 maintains at a low level, that is, the mode control end USB _ ID of the intelligent module 5 and the control input end of the switching unit 1 maintain at a low level, the switching unit 1 electrically connects the first input end with the first output end, that is, the USB data end of the intelligent module 5 is connected with the ethernet communication unit 2; the level of the collector of the second transistor Q2 is kept at a high level, that is, the control terminal of the voltage converting unit 22 is kept at a high level, so that the voltage converting unit 22 performs voltage conversion to supply power to the USB-to-ethernet unit 21, thereby realizing communication between the intelligent module and the ethernet.
When the USB interface unit 4 is connected to a PC or other USB host device, the voltage detection end USB _ VBUS of the intelligent module 5 detects that the USB interface unit 4 inputs a preset voltage value, the external power pin of the USB interface unit 4 is at a high level, the first triode Q1 and the second triode Q2 are both turned on, the second resistor R2 is set to be much smaller than the resistance of the third resistor R3, the emitter of the first triode Q1 is at a high level, that is, the mode control end USB _ ID of the intelligent module 5 and the control input end of the switching unit 1 are at a high level, the switching unit 1 electrically connects the first input end and the second output end, that is, the USB data end of the intelligent module 5 and the USB interface unit 4, thereby realizing communication between the intelligent module and the USB host device; the collector of the second transistor Q2 is turned to low, i.e. the control terminal of the voltage converting unit 22 is at low level, and the voltage converting unit 22 does not operate.
The first input end of the switching unit 1 includes a first input pin and a second input pin, the first input pin is electrically connected to the USB positive data end USB _ DP of the intelligent module 5, and the second input pin is electrically connected to the USB negative data end USB _ DM of the intelligent module 5.
The first output end comprises a first output pin and a second output pin, and the first output pin and the second output pin are both electrically connected with the USB-to-Ethernet unit 21; the second output end comprises a third output pin and a fourth output pin, and the third output pin and the fourth output pin are both electrically connected with the USB interface unit 4.
The storage unit 23 is electrically connected to the USB to ethernet unit 21, and is configured to store data generated by the USB to ethernet unit 21 during ethernet communication.
The network transformer 24 is electrically connected to the USB to ethernet unit 21, and is configured to couple the electrical signal sent by the USB to ethernet unit 21.
In this embodiment, when the USB interface unit is connected to the USB host Device, the two triodes are controlled to be turned on and off by the 5V power supply of the USB host Device, and then the states of the control input terminal of the switching unit and the control terminal of the voltage conversion unit are controlled, so that on the basis of the communication between the USB interface and the ethernet interface, the USB interface communicates with the USB host Device in a Device mode, and the automatic switching between the USB to ethernet communication and the USB communication is realized under the condition of a limited interface, thereby widening the application range and the utilization efficiency of the interface.
Example 4
This embodiment provides an intelligent module, which includes the USB2.0 switching circuit as in any one of embodiments 1 to 3.
The intelligent module includes but is not limited to a CPU or LTE intelligent module.
The USB interface of the intelligent module of the embodiment can realize the communication between the USB interface and the USB main equipment through the high-speed switch on the basis of the communication between the USB interface and the Ethernet interface, and realizes the automatic switching of the USB-to-Ethernet and USB communication functions under the condition of limited interfaces, thereby improving the use performance of the intelligent module.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The USB2.0 switching circuit of the intelligent module is characterized in that the USB2.0 switching circuit comprises a switching unit, an Ethernet communication unit, an electric signal acquisition unit and a USB interface unit;
the switching unit comprises a first input end, a control input end, a first output end and a second output end;
the first input end is electrically connected with the USB data end of the intelligent module, the first output end is electrically connected with the Ethernet communication unit, and the second output end is electrically connected with the USB interface unit;
one end of the electric signal acquisition unit is electrically connected with the mode control end of the intelligent module, the other end of the electric signal acquisition unit is electrically connected with the control input end, and electric signals at two ends of the electric signal acquisition unit are consistent;
when the USB interface unit is not connected with the external equipment, the mode control end of the intelligent module is at a low level, and the intelligent module is in a Host mode; at this time, the control input end of the switching unit is also at a low level, and the switching unit is used for electrically connecting the first input end with the first output end;
when the USB interface unit is connected to the external Device, the mode control end of the intelligent module is at a high level, and the intelligent module is in a Device mode; at this time, the control input end of the switching unit is also at a high level, and the switching unit is configured to switch the first input end to be electrically connected with the second output end.
2. The USB2.0 switching circuit of claim 1, wherein the ethernet communication unit comprises a USB to ethernet unit, and the first output of the switching unit is electrically connected to the USB to ethernet unit;
when the output voltage of the external battery is inconsistent with the power supply voltage of the USB-to-Ethernet unit, the Ethernet communication unit further comprises a voltage conversion unit;
one end of the voltage conversion unit is electrically connected with a voltage pin of the intelligent module and the external battery respectively, and the external battery is used for supplying power to the voltage conversion unit and the intelligent module;
the voltage conversion unit is used for performing voltage conversion on the first voltage input by the external battery to obtain a second voltage;
the voltage conversion unit is also electrically connected with the USB-to-Ethernet unit and is used for supplying power to the USB-to-Ethernet unit.
3. The USB2.0 switching circuit of a smart module of claim 2 wherein the electrical signal acquisition unit further comprises a first resistor;
one end of the first resistor is electrically connected with a power supply end, and the other end of the first resistor is electrically connected with a first general IO end and the mode control end of the intelligent module;
the voltage detection end of the intelligent module is electrically connected with the USB interface unit;
a second general IO end of the intelligent module is electrically connected with the voltage conversion unit;
when the USB interface unit is not connected to the external device, a second general IO end of the intelligent module is at a high level, and the intelligent module is used for triggering the voltage conversion unit to convert;
when the voltage detection end of the intelligent module does not detect that the USB interface unit inputs a preset voltage value, the first general IO end is at a low level, the second general IO end is at a high level, meanwhile, the mode control end is pulled down to be at the low level, and the control end of the voltage conversion unit is at the high level;
when the voltage detection end of the intelligent module detects that the USB interface unit inputs the preset voltage value, the first general IO end is at a high level, the second general IO end is at a low level, meanwhile, the mode control end is pulled up to be at the high level, and the control end of the voltage conversion unit is at the low level.
4. The USB2.0 switching circuit of an intelligent module according to claim 2, wherein the electrical signal collection unit further comprises a first transistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor;
the USB interface unit is electrically connected with one end of the fourth resistor, one end of the sixth resistor and one end of the seventh resistor, the other end of the fourth resistor is grounded, the other end of the sixth resistor is electrically connected with the base electrode of the second triode, and the other end of the seventh resistor is electrically connected with the base electrode of the first triode;
an emitting electrode of the second triode is grounded, a collector electrode of the second triode is electrically connected with one end of the fifth resistor and the control end of the voltage conversion unit, and the other end of the fifth resistor is electrically connected with a power supply end;
an emitting electrode of the first triode is electrically connected with one end of the third resistor, the mode control end of the intelligent module and the control input end of the switching unit, the other end of the third resistor is grounded, a collecting electrode of the first triode is electrically connected with one end of the second resistor, and the other end of the second resistor is electrically connected with the power supply end;
the voltage detection end of the intelligent module is electrically connected with the USB interface unit;
when the voltage detection end of the intelligent module does not detect that a preset voltage value is input into the USB interface unit, the first triode and the second triode are both cut off, the mode control end of the intelligent module keeps a low level, and the control end of the voltage conversion unit keeps a high level;
when the voltage detection end of the intelligent module detects that the USB interface unit inputs a preset voltage value, the first triode and the second triode are both conducted, the mode control end of the intelligent module is at a high level, and the control end of the voltage conversion unit is at a low level.
5. The USB2.0 switching circuit of a smart module of claim 2 wherein the first input includes a first input pin and a second input pin, the first output includes a first output pin and a second output pin, the second output includes a third output pin and a fourth output pin;
the first input pin is electrically connected with a USB positive data end of the USB data end, and the second input pin is electrically connected with a USB negative data end of the USB data end;
the first output pin and the second output pin are both electrically connected with the USB-to-Ethernet unit;
the third output pin and the fourth output pin are electrically connected with the USB interface unit.
6. The USB2.0 switching circuit of a smart module of claim 2 wherein the ethernet communication unit further comprises a storage unit;
the storage unit is electrically connected with the USB-to-Ethernet unit and is used for storing data generated by the USB-to-Ethernet unit in the Ethernet communication process.
7. The intelligent module USB2.0 switching circuit of claim 2, wherein the ethernet communication unit further comprises a network transformer;
the network transformer is electrically connected with the USB-to-Ethernet unit;
and the network transformer is used for coupling the electric signals sent by the USB-to-Ethernet unit.
8. The USB2.0 switching circuit of an intelligent module according to any one of claims 1-7, wherein the switching unit comprises a high speed switch.
9. An intelligent module, characterized in that it comprises a USB2.0 switching circuit according to claims 1-8.
10. The smart module of claim 9, wherein the smart module comprises a CPU or an LTE smart module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922456100.6U CN211264303U (en) | 2019-12-30 | 2019-12-30 | Intelligent module and USB2.0 switching circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922456100.6U CN211264303U (en) | 2019-12-30 | 2019-12-30 | Intelligent module and USB2.0 switching circuit thereof |
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| CN211264303U true CN211264303U (en) | 2020-08-14 |
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| CN201922456100.6U Active CN211264303U (en) | 2019-12-30 | 2019-12-30 | Intelligent module and USB2.0 switching circuit thereof |
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