Hot plug control circuit, interface circuit and display device

Abstract

The application discloses a hot plug control circuit, an interface circuit and a display device. The hot plug control circuit comprises a sensing control module. The sensing control module is used for being connected with a target interface. When a target device accesses the target interface is detected, an opening signal is generated and output to the target device, so that the target device automatically starts according to the opening signal. The hot plug control circuit is simple in structure and high in reliability. The target device can automatically start according to the opening signal, and the convenience of using the device by a user is greatly improved.

Description

Technical Field

[0001] This application relates to the field of OPS technology, specifically to a hot-swap control circuit, interface circuit, and display device. Background Technology

[0002] Hot-swapping refers to the technology of safely inserting or removing hardware devices while the device is running without turning off the power. Due to its characteristics such as no need to shut down, plug and play, and safe removal, it is widely used in various electronic devices to improve system availability and maintenance convenience.

[0003] OPS (Open Pluggable Specification) is an open, pluggable specification. OPS interfaces based on this specification are primarily used in electronic products such as digital signage and integrated interactive whiteboards. However, due to structural design limitations, the OPS interface does not support hot-swapping, making its operation relatively cumbersome. Summary of the Invention

[0004] In view of the above problems, this application provides a hot-swap control circuit, an interface circuit, and a display device to solve the above technical problems.

[0005] In a first aspect, this application provides a hot-swap control circuit, which includes a sensing control module for connecting to a target interface. When the target device is detected to be connected to the target interface, the sensing control module generates an enable signal and outputs it to the target device so that the target device can be automatically powered on according to the enable signal.

[0006] In one possible implementation of this application, the sensing control module includes a detection unit and a control unit; the detection unit, connected to the target interface and the control unit, is used to generate a trigger signal and output it to the control unit when the target device is detected to be connected to the target interface; the control unit, connected to the target interface, is used to generate an enable signal and output it to the target interface in response to the trigger signal.

[0007] In one possible implementation of this application, the target interface is configured with a pluggable detection pin, and the pluggable detection pin is connected to a pull-up unit; the detection unit is connected to the pluggable detection pin and is used to determine that the target device is connected to the target interface when the input signal from the pluggable detection pin changes from a high level to a low level.

[0008] In one possible implementation of this application, the target interface is further configured with a power status pin, which is configured to output a high-level power status signal when the connected target device is not powered on; the detection unit includes an NOT gate and an AND gate; the input of the NOT gate is connected to the pluggable detection pin and is used to invert the input signal to obtain an inverted signal output to the first input of the AND gate; the second input of the AND gate is connected to the power status pin and is used to receive the power status signal, and to perform a logical AND operation on the inverted signal and the power status signal to obtain a trigger signal output to the control unit.

[0009] In one possible implementation of this application, the target interface is configured with a pluggable enable pin, and the control unit includes a trigger, the output of which is connected to the pluggable enable pin; the trigger is used to output an enable signal to the pluggable enable pin in response to a trigger signal, so that the target device starts the power supply in response to the enable signal.

[0010] In one possible implementation of this application, the control unit further includes a timing unit connected to a trigger for controlling the effective duration of the turn signal.

[0011] In one possible implementation of this application, the timing unit includes an RC network connected to the configuration terminal of a trigger, used to adjust the effective duration of the turn-on signal according to the electrical parameters of the RC network.

[0012] In one possible implementation of this application, the trigger is also connected to a power status pin of the target interface, which is configured to output a low-level power status signal when the connected target device is powered on; the trigger is also used to clear data in response to the low-level power status signal in order to wait for the next trigger.

[0013] Secondly, this application also provides an interface circuit, which includes a target interface and a hot-plug control circuit in any possible implementation of the first aspect connected to the target interface.

[0014] Thirdly, this application also provides a display device, which includes a device body and a hot-plug control circuit or an interface circuit in any possible implementation of the first aspect or the second aspect, disposed on the device body.

[0015] From the above, it can be concluded that this application has the following beneficial effects:

[0016] In this application, a sensing control module is connected to the target interface to detect changes in the state of the target interface. When a target device is detected to be connected to the target interface, the sensing control module generates an enable signal and outputs it to the target device, so that the target device can automatically power on according to the enable signal, which greatly improves the convenience of the user in using the device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an application scenario of the hot-swap control circuit provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of a module of the hot-swap control circuit provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of a sensing and control module provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of a connection structure between the detection unit and the target interface provided in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram of a detection unit provided in an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of a control unit provided in an embodiment of this application;

[0024] Figure 7 This is another structural schematic diagram of the control unit provided in the embodiments of this application;

[0025] Figure 8 This is a schematic diagram of a timing unit provided in an embodiment of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0027] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0029] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0030] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0031] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0032] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0033] Before introducing the hot-swap control circuit, interface circuit, and display device of this application, we will first introduce the relevant background information of the embodiments of this application.

[0034] Most OPS interfaces in related technologies use the standard 80-pin JAE interface. This interface uses a long electrical engagement interface, which has high reliability and stability, and is resistant to mating and twisting forces. However, due to the structural design limitations of the JAE interface, the OPS interface does not support hot-swapping, making the operation cumbersome when plugging and unplugging devices and affecting the user experience.

[0035] Based on this, embodiments of this application provide a hot-swap control circuit, an interface circuit, and a display device. The hot-swap control circuit is connected to the target interface through a sensing control module. When the target device is connected to the target interface, it generates an enable signal to automatically power on the target device, thereby realizing the hot-swap function, improving the convenience of users using the device, and enhancing the user experience.

[0036] The hot-swap control circuit, interface circuit, and display device provided in this application will be described in detail below.

[0037] First, embodiments of this application provide a hot-plug control circuit, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of an application scenario of the hot-swap control circuit provided in the embodiments of this application. The hot-swap control circuit 10 can be integrated into the display device and connected to the target interface 20 of the display device, and is used to control the target device 30 to automatically power on when the target device 30 is inserted into the target interface 20.

[0038] In another application scenario, the hot-swap control circuit 10 can also be set on the interface circuit of the display device and connected to the target interface 20 on the interface circuit, so that when the target device 30 is inserted into the target interface 20, the target device 30 can also be controlled to automatically power on.

[0039] In this embodiment of the application, the display device may be a digital signage, an integrated interactive electronic whiteboard, an interactive smart flat panel, a large display screen, or other terminal devices.

[0040] Please see Figure 2 , Figure 2 This is a schematic diagram of a hot-swap control circuit provided in an embodiment of this application. The hot-swap control circuit 10 may include a sensing control module 100, which can be connected to the target interface 20. When the target device 30 is detected to be connected to the target interface 20, the sensing control module 100 generates an enable signal and outputs it to the target device 30 so that the target device 30 can be automatically powered on according to the enable signal.

[0041] In this embodiment, the target interface 20 can be an OPS interface, and the target device 30 can be a pluggable device such as an OPS module or an OPS computer equipped with a corresponding plug-in interface. The target interface 20 can be set on a host running an Android system or a Windows system. When the target device 30 is connected to the target interface 20 through its own plug-in interface and thus plugged into the host, the target device 30 can control the display equipped on the host to display corresponding content.

[0042] The sensing and control module 100 is connected to the target interface 20 and detects the state changes of the target interface 20, that is, it detects the state changes of the target interface 20 when the target device 30 is inserted or removed. If the target device 30 is detected to be inserted into the target interface 20, an enable signal can be generated and transmitted to the target device 30 through the target interface 20, so that the target device 30 can respond to the enable signal to start the power supply and automatically power on based on the voltage signal provided by the power supply, thereby realizing hot-swapping.

[0043] Understandably, the sensing control module 100 can determine whether the target device 30 is inserted into or removed from the target interface 20 by detecting changes in the voltage level of the target interface 20.

[0044] As an example, the sensing control module 100 can be implemented using any existing monostable multivibrator, such as the 74LS123 dual retriggable monostable multivibrator. It is understood that in other application scenarios, the sensing control module 100 can also be implemented using other unit modules with the same or similar functions. The specific implementation can be determined according to the actual application scenario, and no limitation is made here.

[0045] In this embodiment, the sensing control module 100 is connected to the target interface 20 to detect changes in the state of the target interface 20. When a target device 30 is detected to be connected to the target interface 20, the sensing control module 100 generates an activation signal and outputs it to the target device 30, so that the target device 30 can automatically power on according to the activation signal, which greatly improves the convenience of the user in using the device.

[0046] Next, continue with Figure 2 The unit modules shown are described in detail, as well as the specific implementation methods that may be used in practical applications.

[0047] like Figure 3As shown, in some embodiments of this application, the sensing control module 100 may include a detection unit 110 and a control unit 120; the detection unit 110 may be connected to the target interface 20 and the control unit 120, and is used to generate a trigger signal and output it to the control unit 120 when the target device 30 is detected to be connected to the target interface 20; the control unit 120 is connected to the target interface 20 and can be used to generate an open signal and output it to the target interface 20 in response to the trigger signal.

[0048] In this embodiment, the detection unit 110 is connected to the target interface 20 and can detect changes in the state of the target interface 20. When the target device 30 is detected to be connected to the target interface 20, a trigger signal can be generated and output to the control unit 120.

[0049] The control unit 120 can also be connected to the target interface 20 and can generate an enable signal in response to the trigger signal and output it to the target device 30 through the target interface 20, so that the target device 30 can start the power supply in response to the enable signal and automatically power on based on the voltage signal provided by the power supply.

[0050] In this embodiment, the detection unit 110 can determine the state change of the target interface 20 by the level change of the target interface 20. The detection unit 110, together with the control unit 120, realizes the hot-plugging of the target device 30 when it is connected to the target interface 20. The structure is simple and the reliability is high.

[0051] Please see Figure 4 In some embodiments of this application, the target interface 20 is configured with a pluggable detection pin PB_DET, and the pluggable detection pin PB_DET is connected to a pull-up unit 210; the detection unit 110 is connected to the pluggable detection pin PB_DET and can be used to determine that the target device 30 is connected to the target interface 20 when the input signal from the pluggable detection pin PB_DET changes from a high level to a low level.

[0052] In this embodiment, the pluggable detection pin PB_DET is connected to a pull-up unit 210. When no target device 30 is connected, the pluggable detection pin PB_DET is pulled high through the pull-up unit 210, thus providing a high-level input signal to the detection unit 110. The pull-up unit 210 can be implemented using a pull-up resistor connected to a source terminal.

[0053] When the target device 30 is connected to the target interface 20, the target device 30 pulls the potential of the pluggable detection pin PB_DET low. For example, the target device 30 can connect to the pluggable detection pin PB_DET through a mating pin connected to the ground terminal, thereby pulling the potential of the pluggable detection pin PB_DET low, causing the input signal to the detection unit 110 to jump to a low level. Therefore, when the detection unit 110 detects that the input signal jumps from a high level to a low level, that is, when it detects a falling edge, it can determine that the target device 30 is inserted into the target interface 20.

[0054] like Figure 5 As shown, in some embodiments of this application, the target interface 20 is further configured with a power status pin PWR_STATUS, which can be configured to output a high-level power status signal when the connected target device 30 is not powered on; the detection unit 110 may include a NOT gate and an AND gate; the input terminal of the NOT gate is connected to the pluggable detection pin PB_DET, and can be used to invert the input signal to obtain an inverted signal output to the first input terminal of the AND gate; the second input terminal of the AND gate is connected to the power status pin PWR_STATUS, and can be used to receive the power status signal and perform a logical AND operation on the inverted signal and the power status signal to obtain a trigger signal output to the control unit 120.

[0055] In this embodiment of the application, when the target interface 20 is not connected to the target device 30, the pluggable detection pin PB_DET is pulled high by the pull-up unit 210, so that the input signal to the NOT gate is logic "1". After the NOT gate is inverted, the output inverted signal is logic "0". According to the working principle of the AND gate, when there is logic "0" in its input, the output is "0", that is, low level.

[0056] When the target device 30 is connected to the target interface 20, the potential of the pluggable detection pin PB_DET is pulled low, and the input signal is logic "0". After being inverted by the NOT gate, the output inverted signal is logic "1". Since the target device 30 is not powered on, the power status signal is logic "1". The inverted signal and the power status signal are ANDed by the AND gate to obtain a high-level trigger signal output to the control unit 120. Therefore, the change in the level of the AND gate output can inform the control unit 120 of the insertion or removal status of the target device 30.

[0057] like Figure 6As shown, in some embodiments of this application, the target interface 20 is further configured with a pluggable enable pin PS_ON, and the control unit 120 may include a trigger TR, the output terminal Q of the trigger TR being connected to the pluggable enable pin PS_ON; the trigger TR may be used to output an enable signal to the pluggable enable pin PS_ON in response to a trigger signal, so that the target device 30 starts the power supply in response to the enable signal.

[0058] In this embodiment, the trigger TR can be implemented using any existing trigger. The trigger TR is configured to be active high. For example, when the target device 30 is connected to the target interface 20 and the AND gate outputs a high-level trigger signal, the trigger TR can respond to the high-level trigger signal by generating a low-level enable signal and outputting it to the pluggable enable pin PS_ON. However, when the target device 30 is not connected to the target interface 20, the AND gate outputs a low level, and the trigger TR outputs a high level, which cannot trigger the target device 30 to start power.

[0059] For example, the power enable pin (active low) of the target device 30 can be connected to the pluggable enable pin PS_ON, so that a low-level enable signal can be transmitted to the power enable pin through the pluggable enable pin PS_ON, thereby enabling the power supply.

[0060] like Figure 7 As shown, in some embodiments of this application, the control unit 120 may further include a timing unit 1201, which is connected to the trigger TR and is used to control the effective duration of the turn signal.

[0061] In this embodiment of the application, the effective duration of the power-on signal is controlled by the timing unit 1201, which enables the target device 30 to successfully power on in response to the power-on signal.

[0062] Specifically, such as Figure 8 As shown, in some embodiments of this application, the timing unit 1201 may include an RC network connected to the configuration terminal Rext / Cext of the trigger TR, which can be used to adjust the effective duration of the turn-on signal according to the electrical parameters of the RC network.

[0063] In this embodiment of the application, the RC network may include a resistor R and a capacitor C connected in series, wherein the other end of the resistor R is connected to the source end, the other end of the capacitor C is connected to the ground end GND, and the common end of the resistor R and the capacitor C is connected to the configuration end Rext / Cext.

[0064] The effective duration of the turn-on signal, i.e. the duration of the low level, can be determined by the resistor R and the capacitor C. The formula is duration T = K * R * C, where K is a constant, usually about 0.7.

[0065] Assuming the low-level enable signal needs to last for 500ms, and the resistor R is 100kΩ, that is, T = K * R * C = 0.7 * 100000 × C = 500ms, then:

[0066] C = T / (K × R) = 0.5 / (0.7 * 100000) = 7.14uF. Therefore, a capacitor close to 7.14uF, such as 6.8uF or 10uF, can be selected to make the low level duration of the turn-on signal reach 500ms. When the timing ends, the turn-on signal returns to the high level.

[0067] Please continue reading. Figure 8 In some embodiments of this application, the trigger TR can also be connected to the power status pin PWR_STATUS of the target interface 20. The power status pin PWR_STATUS can be configured to output a low-level power status signal when the connected target device 30 is powered on. The trigger TR can also be used to clear data in response to the low-level power status signal in order to wait for the next trigger.

[0068] In this embodiment of the application, when the target device 30 automatically powers on in response to the power-on signal, the power status signal output by the power status pin PWR_STATUS will jump from high level to low level. The low-level power status signal is output to the trigger TR, which can trigger it to clear data and wait for the next trigger.

[0069] Specifically, after the trigger TR completes the data clearing, the power status signal can return to a high level. Thus, when the target device 30 is reconnected to the target interface 20 and automatically powers on again in response to the power-on signal, the power status signal will jump from a high level to a low level again, and so on.

[0070] It is understood that in some embodiments, the control unit 120 may also be implemented using a control chip or a main control chip of a display device configured with the above-mentioned functions, such as a microcontroller unit (MCU), a system on chip (SOC), or a single-chip microcomputer. The specific implementation can be determined according to the actual application scenario and is not limited here.

[0071] Based on the above embodiments, this application also provides an interface circuit, which may include a target interface and such as Figures 1 to 8 The hot-plug control circuit corresponds to any embodiment.

[0072] Because the interface circuit includes the present application, as shown in this application Figures 1 to 8 Corresponding to the hot-plug control circuit in any embodiment, the present application can be implemented as described above. Figures 1 to 8For all the beneficial effects that the hot-swap control circuit can achieve in any embodiment, please refer to the preceding description, which will not be repeated here.

[0073] Based on the above embodiments, this application also provides a display device, which may include a device body and a component disposed on the device body, such as... Figures 1 to 8 The corresponding hot-plug control circuit or interface circuit in any embodiment.

[0074] The display device can be a digital signage, an integrated interactive electronic whiteboard, an interactive smart flat panel, a large display screen, or other terminal equipment.

[0075] Since the display device includes the present application, Figures 1 to 8 Corresponding to the hot-plug control circuit in any embodiment, the present application can be implemented as described above. Figures 1 to 8 For all the beneficial effects that the hot-swap control circuit can achieve in any embodiment, please refer to the preceding description, which will not be repeated here.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A hot-swap control circuit, characterized in that, It includes a sensing and control module, which is used to connect to the target interface. When the target device is detected to be connected to the target interface, the sensing and control module generates an enable signal and outputs it to the target device so that the target device can automatically power on according to the enable signal.

2. The hot-swap control circuit according to claim 1, characterized in that, The sensing and control module includes a detection unit and a control unit; The detection unit is connected to the target interface and the control unit, and is used to generate a trigger signal and output it to the control unit when the target device is detected to be connected to the target interface; The control unit is connected to the target interface and is used to generate the enable signal in response to the trigger signal and output it to the target interface.

3. The hot-swap control circuit according to claim 2, characterized in that, The target interface is configured with a pluggable detection pin, and the pluggable detection pin is connected to a pull-up unit; The detection unit is connected to the pluggable detection pin and is used to determine that the target device is connected to the target interface when the input signal from the pluggable detection pin changes from a high level to a low level.

4. The hot-swap control circuit according to claim 3, characterized in that, The target interface is also equipped with a power status pin, which is configured to output a high-level power status signal when the connected target device is not powered on; the detection unit includes NOT gates and AND gates; The input terminal of the NOT gate is connected to the pluggable detection pin and is used to invert the input signal to obtain an inverted signal output to the first input terminal of the AND gate. The second input terminal of the AND gate is connected to the power status pin to receive the power status signal, and performs a logical AND operation on the inverted signal and the power status signal to obtain the trigger signal, which is then output to the control unit.

5. The hot-swap control circuit according to claim 2, characterized in that, The target interface is configured with a pluggable enable pin, and the control unit includes a trigger, the output of which is connected to the pluggable enable pin. The trigger is configured to output the enable signal to the pluggable enable pin in response to the trigger signal, so that the target device starts the power supply in response to the enable signal.

6. The hot-swap control circuit according to claim 5, characterized in that, The control unit further includes a timing unit, which is connected to the trigger and is used to control the effective duration of the turn-on signal.

7. The hot-swap control circuit according to claim 6, characterized in that, The timing unit includes an RC network, which is connected to the configuration terminal of the trigger and is used to adjust the effective duration of the turn-on signal according to the electrical parameters of the RC network.

8. The hot-swap control circuit according to claim 5, characterized in that, The trigger is also connected to the power status pin of the target interface, and the power status pin is configured to output a low-level power status signal when the connected target device is powered on. The trigger is also configured to clear data in response to the low-level power state signal, in order to wait for the next trigger.

9. An interface circuit, characterized in that, Includes a target interface and a hot-plug control circuit as described in any one of claims 1-8 connected to the target interface.

10. A display device, characterized in that, It includes a device body and a hot-plug control circuit as described in any one of claims 1-8 or an interface circuit as described in claim 9, disposed on the device body.

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