CN213402432U - Interface short-circuit protection device and interface short-circuit protection system - Google Patents
Interface short-circuit protection device and interface short-circuit protection system Download PDFInfo
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- CN213402432U CN213402432U CN202022429447.4U CN202022429447U CN213402432U CN 213402432 U CN213402432 U CN 213402432U CN 202022429447 U CN202022429447 U CN 202022429447U CN 213402432 U CN213402432 U CN 213402432U
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Abstract
The utility model provides an interface short-circuit protection device and an interface short-circuit protection system, relating to the technical field of automobile electronics, wherein the device comprises a power supply module, a switch control module and a feedback module which are connected in pairs; the power supply module is used for supplying power to the connected external equipment; the switch control module is used for disconnecting the feedback module when the power supply module is in a short-circuit state; the feedback module is used for sending a power-off protection signal to a preset system on chip after the connection with the switch control module is disconnected so as to disconnect the power supply of the power supply module and carry out short-circuit protection. The utility model discloses can promote the safety in utilization of the equipment that is provided with this interface short-circuit device, promote user experience.
Description
Technical Field
The utility model belongs to the technical field of automotive electronics technique and specifically relates to an interface short-circuit protection device and interface short-circuit protection system are related to.
Background
With the development of the automobile industry, more and more automobile multimedia systems are added with USB functions in order to increase the entertainment and the rapidity of automobiles. However, when the user uses the external USB function, because the user frequently plugs and unplugs the external device (such as a USB disk), even some users hang the USB disk and the key together, metal on the key may touch the USB interface 5V power supply during use, which may cause a short circuit to burn the USB interface and the USB harness, and thus great loss is brought to the user.
Aiming at the problem that the USB interface and the USB wire harness are burnt out due to short circuit caused by misoperation of a user, an effective solution is not available at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an interface short-circuit protection device and interface short-circuit protection system can promote the safety in utilization of the equipment that is provided with this interface short-circuit protection device, has promoted user experience.
In a first aspect, the present invention provides an interface short-circuit protection device, which comprises a power supply module, a switch control module and a feedback module connected in pairs;
the power supply module is used for supplying power to the connected external equipment;
the switch control module is used for disconnecting the feedback module when the power supply module is in a short-circuit state;
the feedback module is used for sending a power-off protection signal to a preset system on chip after the connection with the switch control module is disconnected so as to disconnect the power supply of the power supply module and carry out short-circuit protection.
In an alternative embodiment, the power supply module is a +5V USB power supply terminal.
In an alternative embodiment, the apparatus further comprises a voltage limiting module; the voltage limiting module is arranged between the power supply module and the switch control module;
the voltage limiting module is used for limiting the voltage provided by the power supply module so as to adapt to the voltage threshold of the switch control module.
In an alternative embodiment, the voltage limiting module comprises a first resistor and a capacitor connected in parallel.
In an optional embodiment, a second resistor is further disposed between the power supply module and the voltage limiting module.
In an optional embodiment, the switch control module is an NPN type triode;
wherein the content of the first and second substances,
the base electrode of the NPN type triode is connected with the power supply module;
the collector of the NPN type triode is connected with the feedback module;
the emitter of the NPN type triode is grounded.
In an alternative embodiment, the apparatus further comprises: a pull-up resistor; the pull-up resistor is connected with the feedback module and used for providing high-level input for the feedback module.
In an alternative embodiment, the pull-up resistor is connected to the collector of the NPN transistor.
In an optional embodiment, the preset system-on-chip comprises a vehicle-mounted navigator system-on-chip.
In a second aspect, the present invention provides a peripheral interface protection system, which comprises the interface short-circuit protection device of any one of the foregoing embodiments, and further comprises a predetermined system on chip connected to the interface short-circuit protection device.
The utility model provides an interface short-circuit protection device and interface short-circuit protection system, this interface short-circuit protection device includes two liang of power module of connecting, on-off control module and feedback module, wherein, power module is used for the external equipment power supply for connecting, on-off control module is used for when power module is short-circuit state, disconnection and feedback module's being connected, feedback module then after the disconnection with on-off control module, send the power-off protection signal to the last system on chip of predetermineeing, so that the power supply of disconnection power module, carry out short-circuit protection. The power supply module, the switch control module and the feedback module are connected in pairs, so that after the power supply module is short-circuited, the power supply of the preset system on chip to the power supply module is cut off in time, the power supply module is disconnected from external equipment, short-circuit protection is carried out, the use safety of equipment provided with the interface short-circuit device can be improved, and the user experience is improved.
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 interface short-circuit protection device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another interface short-circuit protection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a specific interface short-circuit protection device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an interface short-circuit protection system according to an embodiment of the present invention.
Icon: 10-a power supply module; 20-a switch control module; 30-a feedback module; 40-a voltage limiting module.
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.
It should be noted that: like reference numbers and letters refer to like items in the following 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.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Consider because user's abnormal operation, probably lead to the interface short circuit to appear, take place metal short circuit or USB interface splash water when inserting USB such as the USB interface and take place the short circuit to it is unusual to take place the short circuit, the embodiment of the utility model provides an interface short circuit protection device and interface short circuit protection system can promote the safety in utilization of the equipment that is provided with this interface short circuit device, has promoted user experience.
For convenience of understanding, the interface short-circuit protection device provided by the present invention is first described in detail, referring to the schematic structural diagram of an interface short-circuit protection device shown in fig. 1, the device mainly includes a power supply module 10, a switch control module 20 and a feedback module 30 connected in pairs, where the power supply module 10 is used to supply power to an external device connected thereto, and the power supply module 10 may be an interface used to connect an external device, such as a Universal Serial Bus (USB) interface, and in practical applications, the external device connected thereto is supplied with power through the USB interface, such as when the external device is a mobile phone, a USB disk, or the like, the external device such as a mobile phone, a USB disk or the like is supplied with power through the power supply module 10; and audio playing can also be carried out by reading audio files of external equipment such as a mobile phone, a U disk and the like. The switch control module 20 is configured to disconnect the connection with the feedback module 30 when the power supply module 10 is in a short-circuit state, after the power supply module 10 is in a short-circuit state, because the switch control module 20 is connected with the power supply module 10, the switch control module 20 can recognize a level change caused by a short circuit of the power supply module 10, thereby determining a level state connected with the feedback module 30 based on the short-circuit state of the power supply module 10, and the feedback module 30 is configured to send a power-off protection signal to a preset system on chip after the connection with the switch control module 20 is disconnected, so as to disconnect the power supply of the power supply module 10 and perform short-circuit protection. The predetermined System on Chip may be, for example, a System On Chip (SOC) connected to the interface short-circuit protection device. When the interface short-circuit protection device is used for carrying out short-circuit protection on the USB interface of the vehicle-mounted navigator, the preset system on chip is the SOC of the vehicle-mounted navigator.
The embodiment of the utility model provides an interface short-circuit protection device, through setting up power module 10, on-off control module 20 and feedback module 30 of two liang of connections, can in time cut off the power supply of predetermined system on chip to power module 10 after power module 10 takes place the short circuit, so that this power module 10 disconnection and external equipment's be connected, thereby carry out short-circuit protection, can promote the safety in utilization of the equipment that is provided with this interface short-circuit protection device, promoted user experience.
In one embodiment, the power supply module 10 is a +5V USB power supply terminal, and the +5V USB power supply terminal is used for connecting an external device through USB and supplying +5V voltage thereto, for example, when the interface short-circuit protection device is disposed on a car navigation device, the power supply module 10 may be used for supplying power to a USB interface of the car navigation device and a device connected with USB of the car navigation device.
In order to ensure the safety during use, the interface short-circuit protection device may further include a voltage limiting module 40, and referring to the schematic structural diagram of another interface short-circuit protection device shown in fig. 2, the voltage limiting module 40 is disposed between the power supply module 10 and the switch control module 20, and is connected to the power supply module 10 and the switch control module 20, respectively. By providing a voltage limiting module 40 between the power supply module 10 and the switch control module 20, it may be used to limit the voltage provided by the power supply module 10 in order to adapt the voltage threshold of the switch control module 20.
In one embodiment, the voltage limiting module 40 may include a first resistor and a capacitor connected in parallel, and a specific value of the capacitor of the first resistor may be determined according to the voltage of the power supply module 10 and the voltage threshold of the switch control module 20, which is not limited herein.
In addition, in order to realize a better voltage limiting function with lower cost, a second resistor may be disposed between the power supply module 10 and the voltage limiting module 40.
In an embodiment, the switch control module 20 is an NPN type transistor, wherein a base of the NPN type transistor is connected to the power supply module 10, and when the voltage limiting module 40 is disposed between the switch control module 20 and the power supply module 10, the base of the NPN type transistor is connected to the voltage limiting module 40. The collector of the NPN type triode is connected to the feedback module 30, and in practical application, a resistor may be further disposed between the collector of the NPN type triode and the feedback module 30. In addition, the emitter of the NPN transistor is grounded.
The interface short-circuit protection device may further include: and the pull-up resistor is connected with the feedback module 30 and used for providing high level input for the feedback module 30, so that the feedback module 30 is clamped at a high level in a normal state, and the function of stabilizing the working state of the circuit is achieved. In one embodiment, the pull-up resistor may be connected to the collector of the NPN transistor, which provides a high input to the feedback module 30 by being connected in parallel with the feedback module 30.
In one embodiment, when the interface short-circuit protection device is disposed in a car navigation device, the preset system on chip connected to the feedback module 30 may include a system on chip SOC such as a car navigation device.
The embodiment of the present invention further provides a specific interface short-circuit protection device, refer to the schematic structural diagram of a specific interface short-circuit protection device shown in fig. 3, the structure of the interface short-circuit protection device is implemented by the circuit structure shown in fig. 3, and mainly includes a USB power supply terminal USB _ +5V (i.e. the above power supply module 10), a USB detection terminal USB _ DET (i.e. the above feedback module 30), a pull-up resistor for supplying power of 3.3V, a switching transistor Q1 (i.e. the above switch control module 20), a resistor R1 (i.e. the above second resistor), a resistor R2 (i.e. the above first resistor), a resistor R3, a resistor R4 (i.e. the above pull-up resistor), and a capacitor C1.
The base electrode of the triode is connected with the USB power supply end USB _ +5V through a resistor, the emitter electrode of the triode is grounded, the collector electrode of the triode is connected with the USB detection end USB _ DET through a resistor and is also connected with the pull-up resistor, and the USB detection end USB _ DET is a low-voltage detection end. When a USB peripheral interface is short-circuited, the collector of the switching triode is changed from a low level to a high level, so that the USB detection end USB _ DET completes detection according to the change of the level. When a USB interface is inserted into a USB, metal short circuit occurs or the USB interface is splashed with water and short circuit occurs, the base of the switching triode is 0V, the collector and the emitter of the switching triode are not conducted, the USB _ DET detection pin is changed from low level to high level, the SOC changes the USB charging IC USB _ EN enabling pin from high level to low level at the moment, USB 5V power supply is cut off, meanwhile, a navigation screen prompts a user that USB short circuit abnormality occurs, when the short circuit fault is removed, the USB normally works, the base of the switching triode is 0.65V, the collector and the emitter of the switching triode are conducted at the moment, the USB _ DET detection pin is changed from high level to low level all the time, and the SOC keeps the USB charging IC USB _ EN enabling pin from high level all the time, so that USB 5V power supply is normal, a U disk is normally read, and the purpose of.
To sum up, the embodiment of the utility model provides an interface short-circuit protection device can be when the short circuit takes place for the USB peripheral interface, and the collecting electrode of switch triode becomes the high level by the low level to USB _ DET detects the foot and accomplishes the detection, and SOC becomes the low level with USB charging IC's USB _ EN enable foot by the high level this moment, thereby breaks off USB supply terminal USB _ +5V power supply, reaches short-circuit protection's purpose.
The utility model provides an interface short-circuit protection system, see the structural schematic diagram of an interface short-circuit protection system that figure 4 is shown, this interface short-circuit protection system includes the interface short-circuit protection device of any one of the aforesaid embodiment, can also include the predetermined upper system on chip who is connected with interface short-circuit protection device.
The embodiment of the utility model provides an interface short-circuit protection system, power module 10 through setting up two liang of connections, the interface short-circuit protection device of constitutions such as on-off control module 20 and feedback module 30, and the SOC who is connected with interface short-circuit protection device, can take place the short circuit back at power module 10, in time cut off predetermined SOC to power module 10's power supply, so that this power module 10 disconnection and external equipment's is connected, thereby carry out short-circuit protection, can promote the safety in utilization of the equipment that is provided with this interface short-circuit protection device, user experience has been promoted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An interface short-circuit protection device is characterized by comprising a power supply module, a switch control module and a feedback module which are connected in pairs;
the power supply module is used for supplying power to the connected external equipment;
the switch control module is used for disconnecting the feedback module when the power supply module is in a short-circuit state;
the feedback module is used for sending a power-off protection signal to a preset system on chip after the connection with the switch control module is disconnected so as to disconnect the power supply of the power supply module and carry out short-circuit protection.
2. The apparatus of claim 1, wherein the power supply module is a +5V USB power supply.
3. The apparatus of claim 1, further comprising a voltage limiting module; the voltage limiting module is arranged between the power supply module and the switch control module;
the voltage limiting module is used for limiting the voltage provided by the power supply module so as to adapt to the voltage threshold of the switch control module.
4. The apparatus of claim 3, wherein the voltage limiting module comprises a first resistor and a capacitor connected in parallel.
5. The device of claim 3, wherein a second resistor is further disposed between the power supply module and the voltage limiting module.
6. The apparatus of claim 1, wherein the switch control module is an NPN transistor;
wherein the content of the first and second substances,
the base electrode of the NPN type triode is connected with the power supply module;
the collector of the NPN type triode is connected with the feedback module;
the emitter of the NPN type triode is grounded.
7. The apparatus of claim 6, further comprising: a pull-up resistor; the pull-up resistor is connected with the feedback module and used for providing high level input for the feedback module.
8. The apparatus of claim 7, wherein the pull-up resistor is connected to a collector of the NPN transistor.
9. The apparatus of claim 1, wherein the predetermined system-on-chip comprises a car navigator system-on-chip.
10. An interface short-circuit protection system, characterized in that the system comprises the interface short-circuit protection device of any one of claims 1 to 9, and further comprises a preset system on chip connected with the interface short-circuit protection device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022429447.4U CN213402432U (en) | 2020-10-27 | 2020-10-27 | Interface short-circuit protection device and interface short-circuit protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022429447.4U CN213402432U (en) | 2020-10-27 | 2020-10-27 | Interface short-circuit protection device and interface short-circuit protection system |
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| CN213402432U true CN213402432U (en) | 2021-06-08 |
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| CN202022429447.4U Active CN213402432U (en) | 2020-10-27 | 2020-10-27 | Interface short-circuit protection device and interface short-circuit protection system |
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