CN209401012U - A kind of USB interface power control - Google Patents
A kind of USB interface power control Download PDFInfo
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- CN209401012U CN209401012U CN201920280643.4U CN201920280643U CN209401012U CN 209401012 U CN209401012 U CN 209401012U CN 201920280643 U CN201920280643 U CN 201920280643U CN 209401012 U CN209401012 U CN 209401012U
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Abstract
The utility model discloses a kind of USB interface power controls, comprising: management control chip and power input switch and switch of power supply output containing main control module and power management module.Wherein, power input switch and switch of power supply output are connected in parallel between management control chip and the power supply line of USB interface.Management control chip is also electrically coupled to the differential signal line of USB interface, alternatively powers on one in input switch and switch of power supply output according to the power supply signal on the differential signal and power supply line on differential signal line and turns off another.By default, power input switch connection and switch of power supply output shutdown.The utility model can realize that the opposite equip. of USB interface accurately identifies by differential signal and power supply signal, and ensures to avoid and conflict on the power line with opposite equip..
Description
Technical Field
The utility model relates to a power management technical field, in particular to USB interface power controlling means.
Background
USB (Universal Serial Bus) is an external Bus standard. The USB interface has been widely used in various electronic devices, and is responsible for data connection communication and charging work between the electronic devices. The Type-C interface is a hardware interface specification of the USB interface, supports forward insertion and backward insertion between the plug and the socket, is more convenient to use compared with the hardware interface of the traditional USB interface, and can realize blind insertion operation without needing to manage whether the plug and the socket are reversely inserted.
Because the USB interface can realize both data connection and communication between electronic devices and charging of the electronic devices, and meanwhile, the USB interface also has a plurality of data transmission standards, such as USB2.0, USB3.0, and the like, and the devices using the USB interface are various, which will cause the problem that the electronic devices with the USB interface cannot accurately identify the inserted devices when inserting other devices through the USB interface, thereby causing the problem that data cannot be transmitted between the electronic devices and the problem that the USB data line inserted into the USB interface cannot accurately limit the current.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a USB interface power controlling means to difference signal and the power signal through the USB interface come discernment opposite terminal equipment, carry out input/output adjustment to the USB interface power cord according to the kind of opposite terminal equipment.
The technical scheme of the utility model is realized like this:
a USB interface power supply control device comprises a management control chip, a power supply input switch and a power supply output switch; wherein,
the power input switch is electrically connected between the management control chip and a power line of the USB interface;
the power output switch is electrically connected between the management control chip and the power line;
the management control chip is also electrically connected to a differential signal line of the USB interface, and alternatively switches on one of the power input switch and the power output switch and switches off the other of the power input switch and the power output switch according to a differential signal on the differential signal line and a power signal on the power line;
wherein, in a default state, the power input switch is on and the power output switch is off.
Further, in the default state, the management control chip identifies the opposite-end device of the USB interface according to the differential signal on the differential signal line and the power signal on the power line.
Further, when the opposite-end device is a power adapter, the management control chip limits the highest input current of the power line to 2000 mA;
when the opposite-end equipment is not a power adapter, the management control chip identifies the opposite-end equipment of the USB interface through a differential signal on the differential signal line;
when the opposite-end equipment is electrified USB2.0 interface equipment, the management control chip limits the highest input current of the power line to 500 mA;
when the opposite-end equipment is electrified USB3.0 interface equipment, the management control chip limits the highest input current of the power line to 900 mA;
when the opposite-end equipment is OTG equipment, the management control chip controls the power supply input switch to be closed, and then the management control chip controls the power supply output switch to be switched on.
Furthermore, the management control chip comprises a main control module and a power management module, and the USB interface power control device also comprises a signal switch; wherein,
the power management module is electrically connected with the main control module;
the signal change-over switch is provided with a first connecting end, a second connecting end, a third connecting end and a first control end, wherein the first connecting end is electrically connected to the differential signal line, the second connecting end is electrically connected to the power management module, and the third connecting end and the first control end are electrically connected to the main control module;
the power input switch is electrically connected between the power management module and the power line, and is provided with a second control end which is electrically connected with the main control module;
the power output switch is electrically connected between the power management module and the power line, and the power output switch has a third control end electrically connected to the main control module.
Further, the first control end is connected with the main control module through a GPIO interface;
the second control end is connected with the main control module through a GPIO interface;
the third control end is connected with the main control module through a GPIO interface;
the power management module is connected with the main control module through an I2C bus.
Further, in the default state:
the main control module controls the signal change-over switch to switch on the first connecting end and the second connecting end and switch off the first connecting end and the third connecting end;
the main control module controls the power input switch to be switched on;
and the main control module controls the power output switch to be closed.
Further, the power management module identifies the opposite-end device of the USB interface through the differential signal on the differential signal line that is turned on by the signal switch and the power signal on the power line that is turned on by the power input switch in the default state.
Further, when the opposite-end device is a power adapter, the main control module configures the power management module to limit the highest input current of the power line to 2000 mA.
Further, when the opposite-end device is not a power adapter, the main control module controls the signal switch to switch off the first connection end and the second connection end and switch on the first connection end and the third connection end, so as to identify the opposite-end device of the USB interface through a differential signal on the differential signal line switched on by the signal switch.
Further, when the opposite-end device is a charged USB2.0 interface device, the main control module configures the power management module to limit the highest input current of the power line to 500 mA;
when the opposite-end equipment is electrified USB3.0 interface equipment, the main control module configures the power management module to limit the highest input current of the power line to 900 mA;
when the opposite-end equipment is OTG equipment, the main control module controls the power input switch to be closed, and then the main control module controls the power output switch to be switched on.
According to the above technical scheme, the utility model discloses a USB interface power controlling means, utilize the opposite terminal equipment discernment of cooperation completion USB interface between host system and the power management module in the management control chip, accomplish power adapter's discernment by power management module, accomplish USB2.0 equipment by host system, the discernment of USB3.0 equipment and OTG equipment, the accurate identification to the opposite terminal equipment of USB interface has been realized, especially, utilize host system to realize USB2.0 equipment, the discernment of USB3.0 equipment, and then utilize power management module to realize the accurate current-limiting to USB2.0 equipment and USB3.0 equipment, the opposite terminal equipment has been protected effectively and has been avoided overload damage. And simultaneously, the utility model discloses a USB interface power controlling means utilizes the alternative of these two one-way conduction switches of power input switch and power output switch to switch on the operation, has ensured that equipment and USB interface power controlling means can not produce the conflict on the power cord to the terminal. Through the current limiting to power adapter, USB2.0 equipment and USB3.0 equipment, can enough make full use of the ability of opposite terminal equipment side power, can effectively avoid opposite terminal equipment side power overload damage again.
Drawings
Fig. 1 is a schematic structural diagram of a USB interface power control device according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a USB interface power control device according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
Fig. 1 shows a structure of a first embodiment of the USB interface power supply control device of the present invention. As shown in fig. 1, the USB interface power supply control apparatus of the first embodiment includes a management control chip 11, a power input switch 12, and a power output switch 13. The power input switch 12 is electrically connected between the management control chip 11 and the power line 22 of the USB interface 2. The power output switch 13 is electrically connected between the management control chip 11 and the power line 22 of the USB interface 2. The management control chip 11 is also electrically connected to the differential signal line 21 of the USB interface 2, and the management control chip 11 alternatively turns on one of the power input switch 12 and the power output switch 13 and turns off the other of the power input switch 12 and the power output switch 13 according to the differential signal on the differential signal line 21 and the power signal on the power line 22, that is, the management control chip 11 turns off the power output switch 13 when turning on the power input switch 12, or the management control chip 11 turns off the power input switch 12 when turning on the power output switch 13, and the specific operations of turning on and off are described later. Wherein, in a default state, the power input switch 12 is turned on and the power output switch 13 is turned off.
In an alternative embodiment, the management control chip 11 controls the switching states of the power input switch 12 and the power output switch 13 respectively through corresponding control signals. In an alternative embodiment, the power input switch 12 and the power output switch 13 have respective control terminals, and the management control chip 11 is further electrically connected to the power input switch 12 and the power output switch 13, which have respective control terminals, as shown by a dotted line in fig. 1, so that the management control chip 11 sends corresponding control signals to the respective control terminals of the power input switch 12 and the power output switch 13, and the power input switch 12 and the power output switch 13 perform on-off operation under the corresponding control signals to achieve on-off.
In an alternative embodiment, in the default state, the management control chip 11 identifies the peer device of the USB interface 2 according to the differential signal on the differential signal line 21 and the power signal on the power line 22.
In an alternative embodiment, when the management control chip 11 identifies that the opposite device is a power adapter, the management control chip 11 limits the maximum input current of the power line 22 to 2000 mA. When the management control chip 11 identifies that the opposite device is not a power adapter, the management control chip 11 identifies the opposite device of the USB interface 2 through the differential signal on the differential signal line 21. When the management control chip 11 identifies that the opposite-end device is a charged USB2.0 interface device, the management control chip 11 limits the maximum input current of the power line 22 to 500 mA. When the management control chip 11 identifies that the opposite-end device is a charged USB3.0 interface device, the management control chip 11 limits the maximum input current of the power line 22 to 900 mA. When the management control chip 11 identifies that the opposite-end device is an OTG device, the management control chip 11 controls the power input switch 12 to be turned off, and then the management control chip 11 controls the power output switch 13 to be turned on.
Fig. 2 shows a structure of a second embodiment of the USB interface power supply control device of the present invention. As shown in fig. 2, compared with the first embodiment, in the USB interface power control apparatus of the second embodiment, the management control chip 11 further includes a main control module 111 and a power management module 112, and the USB interface power control apparatus of the second embodiment further includes a signal switch 14. The power management module 112 is electrically connected to the main control module 111. The signal switch 14 has a first connection end, a second connection end, a third connection end and a first control end, wherein the first connection end is electrically connected to the differential signal line 21, the second connection end is connected to the power management module 112, and the third connection end and the first control end are electrically connected to the main control module 111. The power input switch 12 is electrically connected between the power management module 112 and the power line 22, and the power input switch 12 has a second control end electrically connected to the main control module 111. The power output switch 13 is electrically connected between the power management module 12 and the power line 22, and the power output switch 13 has a third control terminal electrically connected to the main control module 111.
In an alternative embodiment, the USB interface 2 is a Type-C interface. The USB interface (or Type-C interface) includes two differential signal lines and two power lines, the two differential signal lines are a D + differential signal line and a D-differential signal line, respectively, and the two power lines are a power line 22 and a ground line (not shown in the figure), where the power line 22 is, for example, a VCC line or a positive line.
In an optional embodiment, the first control terminal of the signal switch 14 is connected to the main control module 111 through a GPIO interface, the second control terminal of the power input switch 12 is connected to the main control module 111 through a GPIO interface, and the third control terminal of the power output switch 13 is connected to the main control module 111 through a GPIO interface.
In an alternative embodiment, the power management module 112 and the master control module 111 are connected via an I2C bus.
In an alternative embodiment, the power management module 112 is further electrically connected to the lithium battery 15. In an alternative embodiment, the power management module 112 employs a bq2429x power management chip from TI (texas instruments) and the lithium battery 15 employs a 3.7V lithium battery. The power management module 112 can receive and write the configuration sent by the main control module 111, and execute the corresponding configuration through hardware logic, and the main control module 111 obtains information that the opposite device is not a power adapter from the power management module 112 through the I2C bus.
In the embodiment of the present invention, in the default state: the main control module 111 controls the signal switch 14 to switch on the first connection end and the second connection end and switch off the first connection end and the third connection end, the main control module 111 controls the power input switch 12 to switch on, and the main control module 111 controls the power output switch 13 to switch off.
Furthermore, in an alternative embodiment, the power management module 112 identifies the opposite device of the USB interface 2 through the differential signal on the differential signal line 21 turned on by the signal switch 14 and the power signal on the power line 22 turned on by the power input switch 12 in the default state, that is, the power management module 112 can identify the opposite device of the USB interface 2 through the differential signal and the power signal of the USB interface 2 in the default state. Wherein, the opposite terminal equipment means, except the utility model discloses the USB interface power supply control device of embodiment, connect in other equipment of USB interface 2. The identification of the peer device of the USB interface 2 by the differential signal and the power signal may be implemented by using the prior art, and is not described herein again.
In an alternative embodiment, when the power management module 112 identifies that the peer device is a power adapter, the main control module 111 configures the power management module 112 to limit the maximum input current of the control power line 22 to 2000mA (milliamp). For a device adopting a USB interface, when a power adapter is plugged in from the outside, it means that the device is charged through the USB interface. Further, in this alternative embodiment, the power management module 112 controls the maximum input current limit of the power cord 22 to 2000mA and charges the connected lithium battery 15. How to limit the current and charge the lithium battery can be realized by the prior art, and the description is omitted here.
In an alternative embodiment, when the peer device is not a power adapter, the main control module 111 knows from the power management module 112 that the peer device is not a power adapter, and then the main control module 111 controls the signal switch 14 to switch off the first connection terminal and the second connection terminal and switch on the first connection terminal and the third connection terminal, so as to identify the peer device of the USB interface 2 through the differential signal on the differential signal line 21 switched on by the signal switch 14. In this alternative embodiment, after the first connection end and the second connection end are disconnected, the power management module 112 will not receive the differential signal on the differential signal line 21, and after the first connection end and the third connection end are connected, the differential signal on the differential signal line 21 is directly sent to the main control module 111 and identified by the main control module 111. How to identify the peer device of the USB interface 2 by using the differential signal can be implemented by using the prior art, and will not be described herein again.
In an alternative embodiment, when the main control module 111 identifies that the peer device is a powered USB2.0 interface device, the main control module 111 configures the power management module 112 to limit the maximum input current of the power line 22 to be 500 mA. USB2.0 is a subset of the USB standard, and the theoretical transmission speed of USB2.0 can reach 480 Mbps. The charged USB2.0 interface device is the device at the opposite end which is provided with a power supply, and the device at the opposite end adopts the USB2.0 standard to carry out USB data transmission, and the highest input current of the power line 22 of the USB interface 2 is limited to 500mA, so that an external power supply end (the device at the opposite end) can be protected from overload damage under the USB2.0 standard. How to perform the highest current limiting on the power line can be realized by the prior art, and the details are not described here.
In an alternative embodiment, when the main control module 111 identifies that the opposite device is a powered USB3.0 interface device, the main control module 111 configures the power management module 112 to limit the maximum input current of the power line 22 to 900 mA. The USB3.0 is a subset of the USB standard, and the theoretical transmission speed of the USB3.0 can reach 5.0 Gbps. The charged USB3.0 interface device is the self-contained power supply of the opposite terminal device, the USB3.0 standard is adopted by the opposite terminal device for USB data transmission, the maximum input current of the power line 22 of the USB interface 2 is limited to 900mA, and an external power supply terminal (the opposite terminal device) can be protected under the USB3.0 standard to avoid overload damage. In the USB3.0 or TYPE-C interface, the differential signal line has other differential signal lines besides the D + differential signal line and the D-differential signal line included in the foregoing, in this optional embodiment, identifying that the device at the opposite end is the device with the charged USB3.0 interface is realized by identifying the differential signals of the other differential signal lines (for example, RX/TX differential signal lines) except the D + and D-signal lines in the differential signal lines, and a specific identification process may be realized by using the prior art, and is not described herein again. How to perform the highest current limiting on the power line can be realized by the prior art, and the details are not described here.
In the embodiment of the present invention, the input current refers to a current input from the power line 22 to the management control chip 11 or to the power management module 112.
In an optional embodiment, when the main control module 111 identifies that the opposite-end device is an OTG device, the main control module 111 controls the power input switch 12 to be turned off, and then the main control module 111 controls the power output switch 13 to be turned on. The OTG technology, i.e. On-The-Go, realizes data transmission between devices without Host, for example: the digital camera is directly connected to the printer, and is connected with a USB interface between the digital camera and the printer through an OTG technology to immediately print the taken photos; or the data in the digital camera can be sent to a mobile hard disk of a USB interface through OTG, and the special environment such as field operation and the like can be carried without expensive memory cards or computer carrying. In an optional embodiment, the OTG device does not have a power supply, but needs to be powered by the power management module 12 through the USB interface 2, so the main control module 111 controls the power input switch 12 to be turned off, and then the main control module 111 controls the power output switch 13 to be turned on, so that the power management module 112 supplies power to the OTG device serving as an opposite device through the USB interface 2, and at this time, because the main control module 111 is still connected to the differential signal line 21, data interaction between the main control module 111 and the OTG device is further achieved through the differential signal line 21. After the main control module 111 controls the power output switch 13 to be turned on, the USB interface power control apparatus may supply power to the opposite device through the USB interface 2, in an optional embodiment, when the power management module 112 supplies power to the opposite device through the power line 22 in the USB interface 2, the power management module 112 may adjust the voltage of the power supplied to the power line 22, for example, when the lithium battery 15 adopts a 3.7V lithium battery, the power management module 112 may boost the voltage to 5V and then output the voltage through the power line 22.
In an optional embodiment, after determining that the opposite device is a power adapter, a USB2.0 device, or a USB3.0 device, the power input switch 12 is not turned off, and at this time, the power line 22 supplies power to the USB interface power control apparatus, and at this time, in order to protect the device on the USB interface power control apparatus side from overload damage caused by the power supply of the power line 22, the power management module 112 limits the current of the power supply signal input by the power line 22 to control the voltage drop, so as to prevent the voltage drop from being too much, for example, the voltage of the power line 22 drops to within 5V.
The step of identifying the opposite terminal device of the USB interface by using the USB interface power control apparatus of the second embodiment mainly includes:
step a, in a default state, the differential signal line 21 is connected to the power management module 112, the power management module 112 identifies the opposite-end device of the USB interface 2 through the differential signal and the power signal, the main control module 111 learns from the power management module 112 through the I2C bus whether the identified opposite-end device is a power adapter, if the identified opposite-end device is the power adapter, the main control module 111 configures the power management module 112 to limit the highest input current of the power line 22 to 2000mA and quits the identification process, otherwise, step b is executed;
step b, the main control module 111 controls the signal switch 14 to connect the differential signal line 21 to the main control module 111 through the GPIO signal, and then step c is executed;
step c, the main control module 111 identifies the opposite-end device of the USB interface 2 through the differential signal, if the opposite-end device is identified to be a charged USB2.0 interface device, step d is executed, if the opposite-end device is identified to be a charged USB3.0 interface device, step e is executed, and if the opposite-end device is identified to be an OTG device, step f is executed;
d, the main control module 111 keeps the on state of the power input switch 12 and the off state of the power output switch 13, and configures the power management module 112 to limit the highest input current of the power line 22 to 500 mA;
step e, the main control module 111 keeps the on state of the power input switch 12 and the off state of the power output switch 13, and configures the power management module 112 to limit the highest input current of the power line 22 to 900 mA;
and f, the main control module 111 turns off the power input switch 12 and then turns on the power output switch 13.
In optional embodiment, host system 111 can be for adopting the utility model discloses when USB interface power control device's the equipment in CPU (Central Processing Unit), for example the utility model discloses USB interface power control device is applied to the cell-phone, host system 111 can be for the CPU in the cell-phone.
In an alternative embodiment, the main control module 111 and the power management module 112 are integrated in the same chip.
In an alternative embodiment, the main control module 111, the power management module 112 and the signal switch 15 are integrated in the same chip.
The utility model discloses USB interface power controlling means, utilize the opposite terminal equipment discernment of cooperation completion USB interface between host system and the power management module in the management control chip, accomplish power adapter's discernment by power management module, accomplish USB2.0 equipment by host system, the discernment of USB3.0 equipment and OTG equipment, the accurate discernment to the opposite terminal equipment of USB interface has been realized, especially, utilize host system to realize USB2.0 equipment, the discernment of USB3.0 equipment, and then utilize power management module to realize the accurate current-limiting to USB2.0 equipment and USB3.0 equipment, the opposite terminal equipment of having protected effectively avoids overload damage. And simultaneously, the utility model discloses USB interface power control device utilizes the alternative of these two one-way conduction switches of power input switch and power output switch to switch on the operation, has ensured that the conflict can not be produced on the power cord to terminal equipment side and USB interface power control device side. Through the current limiting to power adapter, USB2.0 equipment and USB3.0 equipment, can enough make full use of the ability of opposite terminal equipment side power, can effectively avoid opposite terminal equipment side power overload damage again.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A USB interface power supply control device is characterized in that:
the USB interface power supply control device comprises a management control chip, a power supply input switch and a power supply output switch; wherein,
the power input switch is electrically connected between the management control chip and a power line of the USB interface;
the power output switch is electrically connected between the management control chip and the power line;
the management control chip is also electrically connected to a differential signal line of the USB interface, and alternatively switches on one of the power input switch and the power output switch and switches off the other of the power input switch and the power output switch according to a differential signal on the differential signal line and a power signal on the power line;
wherein, in a default state, the power input switch is on and the power output switch is off.
2. The USB interface power supply control device according to claim 1, wherein:
in the default state, the management control chip identifies the opposite terminal equipment of the USB interface according to the differential signal on the differential signal line and the power signal on the power line.
3. The USB interface power supply control device according to claim 2, wherein:
when the opposite-end equipment is a power adapter, the management control chip limits the highest input current of the power line to 2000 mA;
when the opposite-end equipment is not a power adapter, the management control chip identifies the opposite-end equipment of the USB interface through a differential signal on the differential signal line;
when the opposite-end equipment is electrified USB2.0 interface equipment, the management control chip limits the highest input current of the power line to 500 mA;
when the opposite-end equipment is electrified USB3.0 interface equipment, the management control chip limits the highest input current of the power line to 900 mA;
when the opposite-end equipment is OTG equipment, the management control chip controls the power supply input switch to be closed, and then the management control chip controls the power supply output switch to be switched on.
4. The USB interface power supply control device according to claim 1, wherein:
the management control chip comprises a main control module and a power supply management module, and the USB interface power supply control device also comprises a signal switch; wherein,
the power management module is electrically connected with the main control module;
the signal change-over switch is provided with a first connecting end, a second connecting end, a third connecting end and a first control end, wherein the first connecting end is electrically connected to the differential signal line, the second connecting end is electrically connected to the power management module, and the third connecting end and the first control end are electrically connected to the main control module;
the power input switch is electrically connected between the power management module and the power line, and is provided with a second control end which is electrically connected with the main control module;
the power output switch is electrically connected between the power management module and the power line, and the power output switch has a third control end electrically connected to the main control module.
5. The USB interface power supply control device according to claim 4, wherein:
the first control end is connected with the main control module through a GPIO interface;
the second control end is connected with the main control module through a GPIO interface;
the third control end is connected with the main control module through a GPIO interface;
the power management module is connected with the main control module through an I2C bus.
6. The USB interface power control device of claim 4, wherein in the default state:
the main control module controls the signal change-over switch to switch on the first connecting end and the second connecting end and switch off the first connecting end and the third connecting end;
the main control module controls the power input switch to be switched on;
and the main control module controls the power output switch to be closed.
7. The USB interface power supply control device according to claim 6, wherein:
and the power supply management module identifies the opposite terminal equipment of the USB interface through the differential signal on the differential signal line switched on by the signal switching switch and the power supply signal on the power supply line switched on by the power supply input switch in the default state.
8. The USB interface power supply control device according to claim 7, wherein:
and when the opposite-end equipment is a power adapter, the main control module configures the power management module to limit the highest input current of the power line to 2000 mA.
9. The USB interface power supply control device according to claim 7, wherein:
when the opposite-end equipment is not a power adapter, the main control module controls the signal switch to cut off the first connecting end and the second connecting end and to connect the first connecting end and the third connecting end, so that the opposite-end equipment of the USB interface is identified through a differential signal on the differential signal line which is connected by the signal switch.
10. The USB interface power supply control device according to claim 9, wherein:
when the opposite-end equipment is electrified USB2.0 interface equipment, the main control module configures the power management module to limit the highest input current of the power line to 500 mA;
when the opposite-end equipment is electrified USB3.0 interface equipment, the main control module configures the power management module to limit the highest input current of the power line to 900 mA;
when the opposite-end equipment is OTG equipment, the main control module controls the power input switch to be closed, and then the main control module controls the power output switch to be switched on.
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| CN201920280643.4U CN209401012U (en) | 2019-03-06 | 2019-03-06 | A kind of USB interface power control |
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| CN201920280643.4U CN209401012U (en) | 2019-03-06 | 2019-03-06 | A kind of USB interface power control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113778921A (en) * | 2020-06-10 | 2021-12-10 | 成都鼎桥通信技术有限公司 | USB data line switching control circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113778921A (en) * | 2020-06-10 | 2021-12-10 | 成都鼎桥通信技术有限公司 | USB data line switching control circuit and method |
| CN113778921B (en) * | 2020-06-10 | 2023-06-23 | 成都鼎桥通信技术有限公司 | USB data line switching control circuit and method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190917 Termination date: 20210306 |