CN215071624U - Protection circuit of USB interface equipment - Google Patents
Protection circuit of USB interface equipment Download PDFInfo
- Publication number
- CN215071624U CN215071624U CN202120199445.2U CN202120199445U CN215071624U CN 215071624 U CN215071624 U CN 215071624U CN 202120199445 U CN202120199445 U CN 202120199445U CN 215071624 U CN215071624 U CN 215071624U
- Authority
- CN
- China
- Prior art keywords
- circuit
- control circuit
- interface
- usb
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The embodiment of the utility model provides a USB interface device's protection circuit, include: the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment; the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals; and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal. The embodiment of the utility model provides a pair of USB interface equipment's protection circuit has solved USB interface equipment and has not been answered the power through setting up isolation control circuit, and when only connecing equipment such as cell-phone alone, the cell-phone chance unconditional power supply to probably lead to the problem that the cell-phone transships or damaged, realized protection USB interface equipment's security, promoted user's experience.
Description
Technical Field
The embodiment of the utility model provides a relate to the electronic product technology, especially relate to a USB interface device's protection circuit.
Background
The Type-C interface of the existing USB C product is used for a CC channel of PD protocol communication and is directly connected to a pin of a PD protocol chip or connected with a resistor in series. In the existing USB C product circuit, when the USB C product circuit is not connected with a power supply, as the CC is directly connected to the PD protocol chip, as long as the Type C interface is connected with a mobile phone, the mobile phone can be used as the SRC to supply power to the product. However, the smart devices such as the mobile phone with weak power supply capability may not provide enough power for the high-power USB C product, so that the mobile phone is pulled and overloaded to trigger the protection mechanism, and even the mobile phone is damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a protection circuit of USB interface equipment to realize the security of protection USB interface equipment.
The embodiment of the utility model provides a USB interface device's protection circuit, include:
the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment;
the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals;
and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal.
Optionally, the method further includes: and the system power supply circuit is connected with the control circuit and is used for providing working power supply or generating the control signal.
Optionally, the method further includes: and the other component circuits of the system are connected with the system power supply circuit, and comprise other devices.
Optionally, the interface circuit is connected to the control circuit through a CC channel.
Optionally, the interface circuit includes a Type-C interface.
Optionally, the control circuit includes a USB PD protocol chip.
Optionally, the interface circuit further includes a MOS transistor Q5, and the MOS transistor Q5 is configured to be turned on or off according to a control signal of the control circuit.
Optionally, the isolation control circuit includes a MOS transistor Q6, and the MOS transistor Q6 is connected between the interface circuit and the control circuit.
Optionally, the MOS transistor Q6 is an NMOS transistor.
Optionally, the external device includes: mobile terminal, panel computer and computer.
The embodiment of the utility model provides a USB interface device's protection circuit, include: the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment; the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals; and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal. The embodiment of the utility model provides a pair of USB interface equipment's protection circuit has solved USB interface equipment and has not been answered the power through setting up isolation control circuit, and when only connecing equipment such as cell-phone alone, the cell-phone chance unconditional power supply to probably lead to the problem that the cell-phone transships or damaged, realized protection USB interface equipment's security, promoted user's experience.
Drawings
Fig. 1 is a circuit connection diagram of a protection circuit of a USB interface device according to a first embodiment of the present invention;
fig. 2 is a circuit connection diagram of a protection circuit of a USB interface device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first module may be termed a second module, and, similarly, a second module may be termed a first module, without departing from the scope of the present application. The first module and the second module are both modules, but they are not the same module. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is the embodiment of the present invention provides a circuit connection diagram of a protection circuit of a USB interface device, the embodiment of the present invention provides a protection circuit of a USB interface device including: the system comprises an interface circuit 1, a control circuit 2, an isolation control circuit 3, a system power circuit 4 and other system forming circuits 5.
The interface circuit 1 is connected to an external device, and is configured to transmit a power signal and other signals of the external device.
In this embodiment, the interface circuit 1 includes a Type-C interface, and may also be other interfaces, which are not specifically limited in this embodiment, and all the functional effects can be achieved. In this embodiment, the external device includes: mobile terminal, panel computer and computer. When an external device is connected to the interface circuit 1 in this embodiment, functions such as data exchange or voltage transmission can be performed. The interface circuit 1 further includes a MOS transistor Q5, and the MOS transistor Q5 is configured to be turned on or off according to a control signal of the control circuit 2.
The control circuit 2 is connected with the interface circuit 1 and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals, and the interface circuit 1 is connected to the control circuit 2 through a CC channel.
In this embodiment, the control circuit 2 includes a USB PD protocol chip, a USB PD (USB Power Delivery) Power transmission protocol, a new standard name of the USB Power in 2013 is USB bpd, and the USB PD protocol is based on USB3.1 and is a Power transmission concept proposed after a type-c port in USB 3.1. This technique can be given greater flexibility, expanding the charging capacity by a factor of 10 at present: up to 100 watts. In this embodiment, the control circuit 2 is mainly used for establishing a communication protocol connection with an external device, and specifically, a 5.1K pull-down resistor (Rd) is built in a CC pin of the USB PD protocol chip, and is used for trapping a voltage of a power Supply Role (SRC) when the CC pin is used as a power consumption role (SNK). According to the definition of Type C specification, CC of SRC can be pulled up to a fixed voltage through an Rp resistor, when SRC and SNK are connected through a wire, because the partial pressure of the Rd resistor of SNK, the CC level on SRC can become low, SRC knows that SNK is connected, and then the SNK is supplied with power. In the existing USB C product circuit, when the USB C product circuit is not connected with a power supply, as the CC is directly connected to the PD protocol chip, as long as the Type C interface is connected with a mobile phone, the mobile phone can be used as the SRC to supply power to the product. In this embodiment, the isolation control circuit 3 is controlled to be turned on or off by the control circuit 2, specifically, the MOS transistor Q6 is controlled by the USB PD protocol chip 1, so that the MOS transistor Q6 can be turned on after the USB PD protocol chip 1 works normally, and the CC path is turned on. Therefore, the problem that the mobile phone is overloaded or damaged possibly due to the fact that the mobile phone can be supplied unconditionally when the USB C product is not connected with a power supply and only is connected with devices such as the mobile phone and the like is solved.
The isolation control circuit 3 is disposed between the interface circuit 1 and the control circuit 2, and is configured to control and isolate the interface circuit 1 and the control circuit 2 according to the control signal.
In this embodiment, the isolation control circuit 3 is a MOS transistor Q6, and the MOS transistor Q6 is connected between the interface circuit 1 and the control circuit 2. In this embodiment, the MOS transistor Q6 is an NMOS transistor, and may also be another type of isolation control device, which is not specifically limited in this embodiment.
The system power circuit 4 is connected to the control circuit 2 and is configured to provide a working power or generate the control signal.
In this embodiment, the system power circuit 4 is mainly a power supply of the USB interface device, such as a mobile phone, which is generally a lithium battery. The system power circuit 4 provides working voltage for the whole USB interface equipment, and the USB interface equipment is guaranteed to support and run.
The other system component circuit 5 is connected to the system power supply circuit 4, and the other system component circuit 5 includes other devices.
In this embodiment, the other components of the system 5 include other control parts in the system, such as a USB HUB module, a video processing module, a communication module, and the like, which are main control parts of the USB system.
The embodiment of the utility model provides a USB interface device's protection circuit, include: the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment; the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals; and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal. The embodiment of the utility model provides a pair of USB interface equipment's protection circuit has solved USB interface equipment and has not been answered the power through setting up isolation control circuit, and when only connecing equipment such as cell-phone alone, the cell-phone chance unconditional power supply to probably lead to the problem that the cell-phone transships or damaged, realized protection USB interface equipment's security, promoted user's experience.
Example two
Fig. 2 is the embodiment of the present invention provides a circuit connection diagram of a protection circuit of a USB interface device, the embodiment of the present invention provides a protection circuit of a USB interface device including: the system comprises an interface circuit 1, a control circuit 2, an isolation control circuit 3, a system power circuit 4 and other system forming circuits 5.
The interface circuit 1 is connected to an external device, and is configured to transmit a power signal and other signals of the external device.
In this embodiment, the interface circuit 1 includes a Type-C interface, and may also be other interfaces, which are not specifically limited in this embodiment, and all the functional effects can be achieved. In this embodiment, the external device includes: mobile terminal, panel computer and computer. When an external device is connected to the interface circuit 1 in this embodiment, functions such as data exchange or voltage transmission can be performed. The interface circuit 1 further includes a MOS transistor Q5, and the MOS transistor Q5 is configured to be turned on or off according to a control signal of the control circuit 2.
The control circuit 2 is connected with the interface circuit 1 and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals, and the interface circuit 1 is connected to the control circuit 2 through a CC channel.
In this embodiment, the control circuit 2 includes a USB PD protocol chip, a USB PD (USB Power Delivery) Power transmission protocol, a new standard name of the USB Power in 2013 is USB bpd, and the USB PD protocol is based on USB3.1 and is a Power transmission concept proposed after a type-c port in USB 3.1. This technique can be given greater flexibility, expanding the charging capacity by a factor of 10 at present: up to 100 watts. In this embodiment, the control circuit 2 is mainly used for establishing a communication protocol connection with an external device, and specifically, a 5.1K pull-down resistor (Rd) is built in a CC pin of the USB PD protocol chip, and is used for trapping a voltage of a power Supply Role (SRC) when the CC pin is used as a power consumption role (SNK). According to the definition of Type C specification, CC of SRC can be pulled up to a fixed voltage through an Rp resistor, when SRC and SNK are connected through a wire, because the partial pressure of the Rd resistor of SNK, the CC level on SRC can become low, SRC knows that SNK is connected, and then the SNK is supplied with power. In the existing USB C product circuit, when the USB C product circuit is not connected with a power supply, as the CC is directly connected to the PD protocol chip, as long as the Type C interface is connected with a mobile phone, the mobile phone can be used as the SRC to supply power to the product.
The isolation control circuit 3 is disposed between the interface circuit 1 and the control circuit 2, and is configured to control and isolate the interface circuit 1 and the control circuit 2 according to the control signal.
In this embodiment, the isolation control circuit 3 is a MOS transistor Q6, and the MOS transistor Q6 is connected between the interface circuit 1 and the control circuit 2. In this embodiment, the MOS transistor Q6 is an NMOS transistor, and may also be another type of isolation control device, which is not specifically limited in this embodiment.
The system power circuit 4 is connected to the control circuit 2 and is configured to provide a working power or generate the control signal.
In this embodiment, the system power circuit 4 is mainly a power supply of the USB interface device, such as a mobile phone, which is generally a lithium battery. The system power circuit 4 provides working voltage for the whole USB interface equipment, and the USB interface equipment is guaranteed to support and run. In this embodiment, the isolation control circuit 3 is controlled to be turned on or off by the system power circuit 4, and specifically, the MOS transistor Q6 is controlled by the system power section 2, so that the MOS transistor Q6 can be turned on after the system is powered on. Therefore, the problem that the mobile phone is overloaded or damaged possibly due to the fact that the mobile phone can be supplied unconditionally when the USB C product is not connected with a power supply and only is connected with devices such as the mobile phone and the like is solved.
The other system component circuit 5 is connected to the system power supply circuit 4, and the other system component circuit 5 includes other devices.
In this embodiment, the other components of the system 5 include other control parts in the system, such as a USB HUB module, a video processing module, a communication module, and the like, which are main control parts of the USB system.
The embodiment of the utility model provides a USB interface device's protection circuit, include: the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment; the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals; and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal. The embodiment of the utility model provides a pair of USB interface equipment's protection circuit has solved USB interface equipment and has not been answered the power through setting up isolation control circuit, and when only connecing equipment such as cell-phone alone, the cell-phone chance unconditional power supply to probably lead to the problem that the cell-phone transships or damaged, realized protection USB interface equipment's security, promoted user's experience.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. A protection circuit for a USB interface device, comprising:
the interface circuit is connected with external equipment and used for transmitting a power supply signal and other signals of the external equipment;
the control circuit is connected with the interface circuit and is used for generating a control signal according to a transmission protocol to control the transmission process of the power supply signal and other signals;
and the isolation control circuit is arranged between the interface circuit and the control circuit and is used for controlling and isolating the interface circuit and the control circuit according to the control signal.
2. The protection circuit for a USB interface device according to claim 1, further comprising: and the system power supply circuit is connected with the control circuit and is used for providing working power supply or generating the control signal.
3. A protection circuit for a USB interface device according to claim 1, wherein the interface circuit is connected to the control circuit via a CC channel.
4. A protection circuit for a USB interface device according to claim 1, wherein the interface circuit comprises a Type-C interface.
5. The protection circuit of claim 1, wherein the control circuit comprises a USB PD protocol chip.
6. The protection circuit of claim 1, wherein the interface circuit further comprises a MOS transistor Q5, the MOS transistor Q5 is configured to turn on or off according to a control signal of the control circuit.
7. A protection circuit for a USB interface device according to claim 1, wherein the isolation control circuit comprises a MOS transistor Q6, the MOS transistor Q6 being connected between the interface circuit and the control circuit.
8. The protection circuit of a USB interface device according to claim 7, wherein the MOS transistor Q6 is an NMOS transistor.
9. The protection circuit for a USB interface device according to claim 1, wherein the external device comprises: mobile terminal, panel computer and computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120199445.2U CN215071624U (en) | 2021-01-25 | 2021-01-25 | Protection circuit of USB interface equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120199445.2U CN215071624U (en) | 2021-01-25 | 2021-01-25 | Protection circuit of USB interface equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215071624U true CN215071624U (en) | 2021-12-07 |
Family
ID=79252519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120199445.2U Active CN215071624U (en) | 2021-01-25 | 2021-01-25 | Protection circuit of USB interface equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215071624U (en) |
-
2021
- 2021-01-25 CN CN202120199445.2U patent/CN215071624U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11314300B2 (en) | Voltage transition control for USB power delivery sources | |
| JP6328795B2 (en) | Baseband PD communication via USB standard A connector | |
| US20230134179A1 (en) | Charging circuit and charging cable | |
| CN103682898B (en) | There is the connector of the data structure being convenient to communicate between main process equipment and annex | |
| US9647475B2 (en) | Charger, terminal, charging system, and charging control method | |
| US20130101132A1 (en) | Method and Device for Earphone and USB to Share Micro-USB Interface | |
| US10574073B2 (en) | Electronic device and method for controlling power supply | |
| US9515701B2 (en) | Method and device for managing information exchange between a main element, for example a NFC controller, and a set of at least two auxiliary elements | |
| CN204180262U (en) | The system connected by audio socket connector, main equipment and slave | |
| US10079499B2 (en) | Type-C factory and special operating mode support | |
| CN102403035A (en) | Semiconductor integrated circuit and system of controlling same | |
| CN109062846B (en) | Universal serial bus device and operation method thereof | |
| CN105357628A (en) | Electronic card exchange method and system, and apparatuses | |
| CN110247265B (en) | Multifunctional data line, switching circuit and switching method | |
| US20150256274A1 (en) | System and method for testing a radio frequency transceiver by controlling test flow via an induced interrupt | |
| CN215071624U (en) | Protection circuit of USB interface equipment | |
| CN107391410B (en) | Bridge connector | |
| CN111509815B (en) | Data line and charging equipment | |
| CN211017659U (en) | USB connects converting circuit and connects converter | |
| CN106354597B (en) | A kind of interface circuit and method for supporting SWP and 7816 interfaces while debugging | |
| CN106488429A (en) | The processing method and processing device of client identification module SIM | |
| KR20210033758A (en) | Method for power supply and an electronic device thereof | |
| EP3702909B1 (en) | Software update device and software update method using same | |
| CN217880305U (en) | USB switching circuit and electronic equipment | |
| CN107247677B (en) | Conversion device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |