CN222897059U - Hot-swap protection circuit - Google Patents
Hot-swap protection circuit Download PDFInfo
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- CN222897059U CN222897059U CN202421508695.XU CN202421508695U CN222897059U CN 222897059 U CN222897059 U CN 222897059U CN 202421508695 U CN202421508695 U CN 202421508695U CN 222897059 U CN222897059 U CN 222897059U
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Abstract
The utility model relates to the technical field of hot plug, in particular to a hot plug protection circuit which comprises a to-be-plugged equipment side module arranged on to-be-plugged equipment and a to-be-plugged equipment side module arranged on to-be-plugged equipment, wherein an insertion detection circuit is used for detecting the preliminary insertion state of the to-be-plugged equipment and the to-be-plugged equipment, is communicated with a control unit and outputs an insertion detection signal to the control unit when the to-be-plugged equipment is initially plugged, a limit detection circuit is used for detecting the complete insertion state of the to-be-plugged equipment and the to-be-plugged equipment, is communicated with the control unit and outputs a limit detection signal to the control unit when the to-be-plugged equipment is completely plugged, and a control unit is used for controlling power supply of a first hot plug conversion unit and the to-be-plugged equipment through a power supply unit based on the insertion detection signal and the limit detection signal. According to the scheme, the hot plug protection of the equipment to be plugged can be realized according to the access state of the equipment to be plugged and the equipment to be plugged.
Description
Technical Field
The utility model relates to the technical field of hot plug, in particular to a hot plug protection circuit.
Background
Hot plug-and-plug is a technique that allows a user to plug or unplug a hardware device (or hardware module) without powering off the system.
In the actual use of products, especially when equipment is overhauled or poor contact is found, it is common to perform plugging operations on the equipment. However, not all devices support the hot plug function, and for devices that do not support hot plug, if the plug operation is performed with the device powered on, the normal operation of the entire device system may be damaged or affected.
Disclosure of utility model
In view of this, the present utility model provides a hot plug protection circuit to solve the problem that the device performs a plug operation under the condition of electrification, which is likely to damage or affect the normal operation of the whole device system.
The utility model provides a hot plug protection circuit, which comprises a device side module to be plugged arranged on a device to be plugged and a device side module to be plugged arranged on a device to be plugged, wherein the device side module to be plugged comprises an insertion detection circuit, a limit detection circuit, a first hot plug conversion unit and a power supply unit, and the power supply unit is connected with the first hot plug conversion unit;
The insertion detection circuit is used for detecting the preliminary insertion state of the equipment to be inserted and the equipment to be inserted, communicating with the control unit when the equipment to be inserted is inserted into the equipment to be inserted and outputting an insertion detection signal to the control unit;
the limit detection circuit is used for detecting the complete access state of the equipment to be plugged and the equipment to be plugged, communicating with the control unit when the equipment to be plugged is plugged into the equipment to be plugged, and outputting a limit detection signal to the control unit;
The control unit is used for controlling the power supply of the first hot plug conversion unit and the equipment to be plugged through the power supply unit based on the received insertion detection signal and the received limit detection signal.
According to the scheme, the insertion detection circuit is used for detecting the preliminary access state between the equipment to be inserted and the equipment to be inserted, and the limit detection circuit is used for detecting the complete access state between the equipment to be inserted and the equipment to be inserted. According to the plug-in detection signal output by the plug-in detection circuit and the limit detection signal output by the limit detection circuit, the connection state and disconnection state of the equipment to be plugged can be automatically detected, after the stable plug-in of the equipment to be plugged is detected, the power supply unit is used for controlling the power supply of the first hot plug conversion unit and the equipment to be plugged, the whole process does not need equipment to be powered off, and the physical keys are not needed to be used for controlling, so that the hot plug protection of the equipment to be plugged is realized, and the convenience and reliability of the system are greatly improved.
In an optional embodiment, the device side module to be plugged further includes a first connector, and the device side module to be plugged further includes a second connector;
the insertion detection circuit is communicated with the first input end of the control unit through the first connector and the second connector in sequence;
The limit detection circuit is communicated with the second input end of the control unit through the first connector and the second connector in sequence.
According to the scheme, the equipment to be plugged is plugged into the equipment to be plugged through the first connector on the equipment side module to be plugged and the second connector on the equipment side module to be plugged, so that when the equipment to be plugged is plugged into the equipment to be plugged, the plug detection circuit and the limit detection circuit are respectively communicated with the control unit.
In an alternative embodiment, the insertion detection circuit includes a first pull-down resistor, a first end of the first pull-down resistor is grounded, a second end of the first pull-down resistor is connected with a first pin of the first connector, and the first pull-down resistor and the second pull-down resistor are sequentially communicated with a first input end of the control unit through the first connector and the second connector;
The limit detection circuit comprises a limit switch, the first end of the limit switch is grounded, the second end of the limit switch is connected with the second pin of the first connector, and the limit switch is communicated with the second input end of the control unit through the first connector and the second connector in sequence.
According to the scheme, the initial insertion state between the equipment to be plugged and the equipment to be plugged is detected through the pull-down resistor, the complete access state between the equipment to be plugged and the equipment to be plugged is detected through the limit switch, and the insertion state and the disconnection state of the equipment to be plugged can be automatically detected according to the insertion detection signal output by the pull-down resistor and the limit detection signal output by the limit switch, so that the hot plug protection of the equipment to be plugged is realized.
In an alternative embodiment, the module at the side of the device to be plugged further includes a first pull-up resistor, and the first input terminal of the control unit is connected to the first pull-up resistor.
According to the scheme, when the equipment to be plugged is not plugged into the plugging object equipment, the level of the first input end of the control unit is pulled up through the first pull-up resistor, so that high-level voltage is input to the first input end of the control unit.
In an alternative embodiment, the limit detection circuit further includes a first resistor, and the second end of the limit switch is further connected to the first power supply end through the first resistor.
According to the scheme, when the equipment to be plugged is not completely plugged into the plugging object equipment, the level of the second input end of the control unit is pulled up through the first power end and the first resistor, so that high-level voltage is input to the second input end of the control unit.
In an alternative embodiment, the first output terminal of the control unit is in communication with the enabling terminal of the power supply unit to send a power supply enabling signal to the power supply unit;
The first output end of the power supply unit is connected with the first input end of the equipment to be plugged, the second output end of the power supply unit is connected with the first input end of the first hot plug conversion unit so as to send a first enabling signal to the first hot plug conversion unit, and the first output end of the first hot plug conversion unit is connected with the second input end of the equipment to be plugged.
According to the scheme, when the control unit receives the low-level insertion detection signal and the limit detection signal at the same time, the control unit sends the power supply enabling signal to the power supply unit so that the power supply unit supplies power for the hot plug converter and the external equipment, and the signal circuit is communicated.
In an alternative implementation manner, the plug object device side module further comprises a second hot plug conversion unit, and the third output end of the power supply unit is communicated with the first input end of the second hot plug conversion unit.
According to the scheme, the hot plug protection is provided for the equipment side module to be plugged through the second hot plug conversion unit and the first hot plug conversion unit.
In an alternative implementation mode, the control end of the first hot plug conversion unit is communicated with the control end of the second hot plug conversion unit, and the communication end of the first hot plug conversion unit is communicated with the communication end of the second hot plug conversion unit.
The first hot plug conversion unit and the second hot plug conversion unit are in control connection with each other, and signals between the equipment to be plugged and the equipment to be plugged are converted.
In an alternative implementation manner, the equipment side module to be plugged further comprises a second pull-down resistor, and the enabling end of the power supply unit is grounded through the second pull-down resistor.
The scheme provides circuit protection for the connection between the power supply unit and the control unit through the second pull-down resistor so as to ensure the stability and the accuracy of a power supply enabling signal.
In an alternative implementation manner, the equipment side module to be plugged further comprises a third pull-down resistor, and the second output end of the power supply unit is grounded through the third pull-down resistor.
According to the scheme, circuit protection is provided for connection between the power supply unit and the first hot plug conversion unit through the third pull-down resistor, so that stability and accuracy of enabling signals are guaranteed.
The technical scheme provided by the utility model can comprise the following beneficial effects:
The utility model firstly detects the preliminary access state between the equipment to be plugged and the equipment to be plugged through the plug-in detection circuit, and then detects the complete access state between the equipment to be plugged and the equipment to be plugged through the limit detection circuit. According to the plug-in detection signal output by the plug-in detection circuit and the limit detection signal output by the limit detection circuit, the connection state and disconnection state of the equipment to be plugged can be automatically detected, after the stable plug-in of the equipment to be plugged is detected, the power supply unit is used for controlling the power supply of the first hot plug conversion unit and the equipment to be plugged, the whole process does not need equipment to be powered off, and the physical keys are not needed to be used for controlling, so that the hot plug protection of the equipment to be plugged is realized, and the convenience and reliability of the system are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hot plug protection circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of another hot plug protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram showing connection between the insertion detection circuit and the limit detection circuit and the control unit, respectively, according to an embodiment of the present utility model;
Fig. 4 is a schematic diagram of connection of a power supply unit and a control unit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram illustrating signal transmission of a hot plug converter according to an embodiment of the present utility model;
Fig. 6 is a schematic diagram of a hot plug protection circuit according to another embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
According to an embodiment of the present utility model, there is provided a hot plug protection circuit, and fig. 1 is a schematic structural diagram of a hot plug protection circuit according to an embodiment of the present utility model, as shown in fig. 1, the circuit includes:
The device-side module 1 to be plugged and arranged on the device 3 to be plugged and the device-side module 2 to be plugged and arranged on the device to be plugged, wherein the device-side module 1 to be plugged comprises an insertion detection circuit 12, a limit detection circuit 11, a first hot plug conversion unit 14 and a power supply unit 13, and the power supply unit 13 is connected with the first hot plug conversion unit 14;
The insertion detection circuit 12 is configured to detect a preliminary insertion state of the device to be plugged 3 and the device to be plugged, and communicate with the control unit 21 and output an insertion detection signal to the control unit 21 when the device to be plugged 3 is plugged into the device to be plugged;
the limit detection circuit 11 is configured to detect a complete access state of the device to be plugged 3 and the device to be plugged, and communicate with the control unit 21 and output a limit detection signal to the control unit 21 when the device to be plugged 3 is plugged into the device to be plugged;
The control unit 21 is configured to perform power supply control on the first hot plug conversion unit 14 and the device to be plugged 3 through the power supply unit 13 based on the received plug detection signal and the limit detection signal.
In an alternative embodiment, in practical application, the device side module 1 to be plugged may be disposed on the device 3 to be plugged (for example, the device 3 to be plugged is plugged into an interface of the device side module 1 to be plugged), and the device to be plugged may be a master device for collecting or processing data of the device 3 to be plugged, where when the device side module 1 to be plugged is plugged into the device side module 2 to be plugged, the device 3 to be plugged is also plugged into the device to be plugged.
In an alternative embodiment, please refer to the schematic structural diagram of another hot plug protection circuit shown in fig. 2, the device side module to be plugged 1 further includes a first connector 15, and the device side module to be plugged 2 further includes a second connector 23;
The insertion detection circuit 12 communicates with a first input terminal of the control unit 21 sequentially through the first connector 15 and the second connector 23;
the limit detection circuit 11 is in turn connected to the second input of the control unit 21 via the first connector 15 and the second connector 23.
Further, when the device side module 1 to be plugged is plugged into the device side module 2 to be plugged, the first connector 15 is connected with the second connector 23, the first connector 15 and the second connector 23 are connected to form a connection terminal connector, a connection channel is provided for each component in the hot plug protection circuit to realize high-speed data transmission and signal transmission, the model of the first connector 15 is TX25-80P-LT-H1E (H1), and the model of the second connector 23 is TX24-80R-LT-H1E (H2).
In an alternative embodiment, referring to the schematic connection diagram of the insertion detection circuit 12 and the limit detection circuit 11 shown in fig. 3 with the control unit 21, the insertion detection circuit 12 includes a first pull-down resistor R1, a first end of the first pull-down resistor R1 is grounded, a second end of the first pull-down resistor R1 is connected to a first pin of the first connector 15, and is sequentially connected to a first input end of the control unit 21 through the first connector 15 and the second connector 23;
The limit detection circuit 11 includes a limit switch SQ, a first end of the limit switch SQ is grounded, a second end of the limit switch SQ is connected to the second pin of the first connector 15, and is sequentially connected to the second input end of the control unit 21 through the first connector 15 and the second connector 23.
Further, the first pull-down resistor R1 is a resistor directly connected to ground, and is configured to pull down the input voltage of the first input terminal of the control unit 21 through the first connector 15 and the second connector 23 in sequence when the device 3 to be plugged into the plugging object device, that is, the first pull-down resistor R1 inputs a low-level plug-in detection signal to the first input terminal of the control unit 21, and the first ground of the limit switch SQ is configured to be closed when the device 3 to be plugged into the plugging object device is completely plugged into the device, and pull down the input voltage of the second input terminal of the control unit 21 through the first connector 15 and the second connector 23 in sequence, that is, the limit switch SQ inputs a low-level limit detection signal to the second input terminal of the control unit 21.
Further, as shown in fig. 2, the first pin of the first connector 15 may be 63pin (63 pin), and the second pin of the first connector 15 may be 60pin (60 pin). The second end of the first pull-down resistor R1 is connected to the first pin of the first connector 15 and is connected to the first pin of the second connector 23 through the first pin of the first connector 15, the first pin of the second connector 23 is connected to the first input end of the control unit 21 to output the insertion detection signal to the control unit 21, the second end of the limit switch SQ is connected to the second pin of the first connector 15 and is connected to the second pin of the second connector 23 through the second pin of the first connector 15, and the second pin of the second connector 23 is connected to the second input end of the control unit 21 to output the limit detection signal to the control unit 21. The control unit 21 may be a single-chip microcomputer.
In an alternative embodiment, the device-side module 2 to be plugged further includes a first pull-up resistor R3, and the first input terminal of the control unit 21 is connected to the first pull-up resistor R3.
Further, the first pull-up resistor R3 is configured to pull up the input voltage of the first input terminal of the control unit 21 when the device to be plugged 3 is not initially plugged into the device to be plugged, that is, the first pull-up resistor R3 inputs a high level signal to the first input terminal of the control unit 21.
In an alternative embodiment, the limit detection circuit 11 further includes a first resistor R2, and the second terminal of the limit switch SQ is further connected to the first power supply terminal VCC1 through the first resistor R2.
Further, the limit switch SQ is in an off state when the device 3 to be plugged is not fully plugged into the device to be plugged, at this time, the first power supply terminal VCC1 is sequentially connected to the second input terminal of the control unit 21 through the first resistor R2, the first connector 15, and the second connector 23, and the first power supply terminal VCC1 and the first resistor R2 pull the input voltage of the second input terminal of the control unit 21 high, so that the first resistor R2 sequentially inputs a high level signal to the second input terminal of the control unit 21 through the first connector 15 and the second connector 23.
In an alternative embodiment, the first output terminal of the control unit 21 communicates with the enabling terminal of the power supply unit 13 to send a power supply enabling signal to the power supply unit 13;
The first output end of the power supply unit 13 is connected with the first input end of the device to be plugged 3, the second output end of the power supply unit 13 is connected with the first input end of the first hot plug conversion unit 14 to send a first enabling signal to the first hot plug conversion unit 14, and the first output end of the first hot plug conversion unit 14 is connected with the second input end of the device to be plugged 3.
Further, the power supply unit 13 provides the required power for the device to be plugged 3 and the hot plug converter (including the first hot plug converting unit 14 and the second hot plug converting unit 22) under the control of the control unit 21. Referring to the connection schematic diagram of the power supply unit 13 and the control unit 21 shown in fig. 4, after the insertion detection circuit 12 and the limit detection circuit 11 generate low levels at the same time, which means that the device 3 to be inserted is completely inserted into the device to be inserted, a first output terminal of the control unit 21 outputs a power supply enable signal to an enable terminal (i.e. an EN pin in fig. 4) of the power supply unit 13, an input terminal VIN of the power supply unit 13 is connected to the second power supply VCC2, and the first output terminal of the power supply unit 13 is controlled to generate the power supply VCC3 to supply power to the hot plug converter and the device 3 to be inserted, and a second output terminal of the power supply unit 13 outputs a zoom_oe_en enable signal (herein, i.e. a first enable signal) for enabling the first hot plug conversion unit 14.
In an alternative embodiment, the device-side module 2 of the plugging object further includes a second hot plug converting unit 22, and the third output end of the power supply unit 13 is communicated with the first input end of the second hot plug converting unit 22.
Further, when the device 3 to be plugged is completely plugged into the device to be plugged, the third output end of the power supply unit 13 is communicated with the first input end of the second hot plug conversion unit 22, and the first output end of the power supply unit 13 is controlled to generate the power supply VCC3 to supply power to the second hot plug conversion unit 22, and the third output end of the power supply unit 13 outputs a zoom_oe_en enable signal (herein, the zoom_oe_en enable signal is the second enable signal) for enabling the second hot plug conversion unit 22.
In an alternative embodiment, the control end of the first hot plug conversion unit 14 communicates with the control end of the second hot plug conversion unit 22, and the communication end of the first hot plug conversion unit 14 communicates with the communication end of the second hot plug conversion unit 22.
Further, when the device 3 to be plugged is completely plugged into the device to be plugged, the first hot plug converting unit 14 is communicated with the second hot plug converting unit 22 and starts to work, so that electrostatic damage possibly generated during hot plug is avoided, and transmission stability of communication signals is enhanced.
Referring to the signal transmission schematic diagram of the hot plug converter shown in fig. 5, the second hot plug converting unit 22 and the first hot plug converting unit 14 together form the hot plug converter BUFFER in fig. 5, and the second output terminal and the third output terminal of the power supply unit 13 output the zoom_oe_en enable signal to the hot plug converter BUFFER to control the hot plug converter BUFFER to be enabled. The control end of the hot plug converter BUFFER receives a control signal sent by the equipment to be plugged and sends the control signal to the equipment to be plugged 3 so as to control the equipment to be plugged 3 to execute operations such as initialization and the like, and the communication end of the hot plug converter BUFFER also receives a communication signal sent by the equipment to be plugged and sends the communication signal to the equipment to be plugged 3 so as to realize communication data transmission with the equipment to be plugged 3.
In an alternative embodiment, the device side module 1 to be plugged further comprises a second pull-down resistor R4, and the enabling end of the power supply unit 13 is further grounded through the second pull-down resistor R4.
Further, when the device 3 to be plugged is completely plugged into the device to be plugged, the first output end of the control unit 21 is grounded through the second connector 23, the first connector 15 and the second pull-down resistor R4 in sequence, and circuit protection is provided for connection between the power supply unit 13 and the control unit 21 through the second pull-down resistor R4, so as to ensure stability and accuracy of the power supply enabling signal.
In an alternative embodiment, the device side module 1 to be plugged further includes a third pull-down resistor R5, and the second output terminal of the power supply unit 13 is further grounded through the third pull-down resistor R5.
Further, when the device 3 to be plugged is completely plugged into the device to be plugged, the second output end of the power supply unit 13 is grounded through the third pull-down resistor R5, so as to provide circuit protection for the connection between the power supply unit 13 and the first hot plug conversion unit 14, so as to ensure stability and accuracy of the enable signal.
In an alternative implementation, the present embodiment may be used in a video conference terminal product and other systems with a pan-tilt camera 31, so, as shown in fig. 6, the device 3 to be plugged may be a pan-tilt camera 31, the device to be plugged may be an image signal collecting device 4, the image signal collecting device 4 may be an image signal collecting main board, an image collecting chip 41 is disposed in the image signal collecting main board, the device side module 1 to be plugged/fixed on the pan-tilt camera 31, the device side module 2 to be plugged/fixed on the image signal collecting device 4, and the pan-tilt camera 31 realizes the hot plug with the image signal collecting device 4 through the device side module 1 to be plugged and the device side module 2 to be plugged.
When the pan-tilt camera 31 is inserted into the image signal acquisition device 4, the output end of the image acquisition chip 41 is sequentially connected with the second input end of the pan-tilt camera 31 through the second hot plug conversion unit 22 and the first hot plug conversion unit 14, so as to control the pan-tilt camera 31 to perform initialization and image acquisition. After the first hot plug converting unit 14 and the second hot plug converting unit 22 ensure reliable connection of signals, the image capturing chip 41 initializes and self-checks the pan-tilt camera 31, and after the initialization and self-checking are completed, the image capturing chip 41 starts the image capturing function to control the pan-tilt camera 31 to start working normally.
Further, when the pan-tilt camera 31 is plugged into the image signal collecting device 4, the output end of the image collecting chip 41 is connected to the input end of the second hot plug converting unit 22, two connection lines exist between the first hot plug converting unit 14 and the second hot plug converting unit 22, which are respectively a control signal connection and a communication signal connection (when the plug-in object device is the image signal collecting device 4, the communication signal connection may be a MIPI signal connection), and the first output end of the first hot plug converting unit 14 is connected to the second input end of the pan-tilt camera 31. Therefore, the image acquisition chip 41 can sequentially output a control signal to the pan-tilt camera 31 through the control end of the second hot plug conversion unit 22, the control end of the first hot plug conversion unit 14 and the second input end of the pan-tilt camera 31 to control the pan-tilt camera 31 to perform initialization and self-inspection operations, and the image acquisition chip 41 can sequentially output an MIPI signal to the pan-tilt camera 31 through the communication end of the second hot plug conversion unit 22, the communication end of the first hot plug conversion unit 14 and the second input end of the pan-tilt camera 31 to control the pan-tilt camera 31 to perform image acquisition operations. The whole circuit structure forms a closed loop system, and from insertion detection, stable insertion confirmation, power supply control and signal enhancement of the cradle head camera 31 to starting of image acquisition, all links are tightly connected, so that the safety and stability of the hot plug process of the cradle head camera are ensured.
Based on the circuit structure of the hot plug protection circuit in the above embodiment, the working principle and flow thereof can be as follows:
In the working process of the equipment side module 2 to be plugged, the equipment side module 1 to be plugged is plugged, the plug-in detection circuit 12 outputs a low-level plug-in detection signal at the 63pin of the first connector 15, the plug-in detection signal is fed back to the control unit 21 through the 63pin of the second connector 23 (when no equipment 3 to be plugged is connected, the signal sent by the 63pin of the second connector 23 to the control unit 21 is a high-level signal, when the equipment 3 to be plugged is connected, the pull-down resistor of the plug-in detection circuit 12 pulls down the 63pin of the second connector 23, the control unit 21 can detect a first low-level signal, and when the equipment 3 to be plugged is plugged into the bottom, the limit switch SQ of the limit detection circuit 11 outputs a low-level limit detection signal at the 60pin of the first connector 15, and feeds back the limit detection signal to the control unit 21 through the 60pin of the second connector 23 (when the equipment 3 to be plugged is not plugged into the bottom, the 60pin of the second connector 23 sends out a signal to the control unit 21, when the 60pin of the second connector 23 is connected to the control unit 21 is connected to the high-level signal, the control unit is connected to the control unit 3 to be plugged, the control unit can simultaneously, the control unit 21 can detect the first low-level signal through the control unit 21, and the two low-level signal can be connected to the control unit 1 can be connected to the control unit, and the control unit can simultaneously, and the two side power supply signal can be connected to the control unit 1 through the control unit 11 when the low-plug detector has the 60.
When the device 3 to be plugged is the cradle head camera 31 and the device to be plugged is the image signal acquisition device 4, the image acquisition chip 41 of the embodiment controls the cradle head to complete the power-on self-test and MIPI signal acquisition work. The hot plug converter supplies power after the holder camera 31 is reliably inserted, so that the possibility of electrostatic damage during live plug is avoided, the hot plug converter has a signal enhancement function, and the long-distance transmission stability of communication signals and the reliable connection of control signals during hot plug are ensured. After the signals of the hot plug converter are reliably connected, the image acquisition chip 41 initializes the cradle head camera 31 and carries out cradle head self-checking, and after the initialization and the cradle head self-checking are finished, the image acquisition chip 41 controls the cradle head camera 31 to start image acquisition work. In this embodiment, only when the cradle head camera 31 is inserted and the cradle head camera 31 is detected to be inserted to the bottom, the power supply, the cradle head initialization and the image acquisition function are started, so that damage to the cradle head camera 31 and the image signal acquisition device 4 caused by poor contact or hot plugging of the device is prevented.
The following describes the high and low level scenarios generated by the insertion detection circuit 12 and the limit detection circuit 11, respectively:
Scenario 1. When the device to be plugged 3 is not connected to the device to be plugged, the 63pin of the first connector 15 corresponding to the plug detection circuit 12 is a high level signal, and when the control unit 21 detects the high level signal, it is determined that the device to be plugged 3 is not plugged.
Scene 2. When the device 3 to be plugged is initially connected to the device to be plugged, the first low level signal output by the plug detection circuit 12 is transmitted to the control unit 21 through the 63pin (first pin) of the first connector 15, the control unit 21 confirms that the device 3 to be plugged is initially plugged after collecting the first low level signal, but if the device 3 to be plugged is not fully plugged at this time, the limit switch SQ of the limit detection circuit 11 outputs a high level signal to the control unit 21, the control unit 21 collects the high level signal through the 60pin (second pin) of the second connector 23, and confirms that the device 3 to be plugged is poorly, and the power supply unit 13 is not opened.
Scene 3 when the device 3 to be plugged is initially connected to the device to be plugged, the first low level signal output by the plug detection circuit 12 is transmitted to the control unit 21 through the 63pin (first pin) of the first connector 15, the control unit 21 confirms that the device 3 to be plugged is initially plugged after collecting the first low level signal, when the device 3 to be plugged is plugged into the bottom and well contacted, the limit switch SQ of the limit detection circuit 11 outputs the second low level signal to the control unit 21, the control unit 21 collects the second low level signal through the 60pin (second pin) of the second connector 23, and confirms that the device 3 to be plugged is completely plugged and well contacted according to the low level signal generated by the plug detection circuit 12 and the limit detection circuit 11, at the moment, the control unit 21 controls the power supply unit 13 to generate a power supply to the device 3 to be plugged and the hot plug converter, and the signal circuit is communicated.
In summary, the present utility model detects the preliminary access state between the device to be plugged and the device to be plugged through the plug detection circuit, and then detects the complete access state between the device to be plugged and the device to be plugged through the limit detection circuit. According to the plug-in detection signal output by the plug-in detection circuit and the limit detection signal output by the limit detection circuit, the connection state and disconnection state of the equipment to be plugged can be automatically detected, after the stable plug-in of the equipment to be plugged is detected, the power supply unit is used for controlling the power supply of the first hot plug conversion unit and the equipment to be plugged, the whole process does not need equipment to be powered off, and the physical keys are not needed to be used for controlling, so that the hot plug protection of the equipment to be plugged is realized, and the convenience and reliability of the system are greatly improved.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (10)
1. The hot plug protection circuit is characterized by comprising a device side module to be plugged and arranged on a device to be plugged and a device side module to be plugged and arranged on a device to be plugged, wherein the device side module to be plugged comprises an insertion detection circuit, a limit detection circuit, a first hot plug conversion unit and a power supply unit, and the power supply unit is connected with the first hot plug conversion unit;
The insertion detection circuit is used for detecting the preliminary insertion state of the equipment to be inserted and the equipment to be inserted, communicating with the control unit when the equipment to be inserted is inserted into the equipment to be inserted and outputting an insertion detection signal to the control unit;
the limit detection circuit is used for detecting the complete access state of the equipment to be plugged and the equipment to be plugged, communicating with the control unit when the equipment to be plugged is plugged into the equipment to be plugged, and outputting a limit detection signal to the control unit;
The control unit is used for controlling the power supply of the first hot plug conversion unit and the equipment to be plugged through the power supply unit based on the received insertion detection signal and the received limit detection signal.
2. The circuit of claim 1, wherein the device side module to be plugged further comprises a first connector, and the device side module to be plugged further comprises a second connector;
the insertion detection circuit is communicated with the first input end of the control unit through the first connector and the second connector in sequence;
The limit detection circuit is communicated with the second input end of the control unit through the first connector and the second connector in sequence.
3. The circuit of claim 2, wherein the insertion detection circuit comprises a first pull-down resistor, a first end of the first pull-down resistor being grounded, a second end of the first pull-down resistor being connected to a first pin of the first connector and in turn being in communication with a first input of the control unit via the first connector and the second connector;
The limit detection circuit comprises a limit switch, the first end of the limit switch is grounded, the second end of the limit switch is connected with the second pin of the first connector, and the limit switch is communicated with the second input end of the control unit through the first connector and the second connector in sequence.
4. The circuit of claim 3, wherein the device-side module to be plugged further comprises a first pull-up resistor, the first input of the control unit being connected to the first pull-up resistor.
5. The circuit of claim 3, wherein the limit detection circuit further comprises a first resistor, the second end of the limit switch further being connected to a first power supply end through the first resistor.
6. The circuit of any one of claims 1 to 5, wherein a first output of the control unit communicates with an enable of the power supply unit to issue a power supply enable signal to the power supply unit;
The first output end of the power supply unit is connected with the first input end of the equipment to be plugged, the second output end of the power supply unit is connected with the first input end of the first hot plug conversion unit so as to send a first enabling signal to the first hot plug conversion unit, and the first output end of the first hot plug conversion unit is connected with the second input end of the equipment to be plugged.
7. The circuit of claim 6, wherein the device-side module further comprises a second hot plug conversion unit, and wherein a third output of the power supply unit is in communication with a first input of the second hot plug conversion unit.
8. The circuit of claim 7, wherein the control terminal of the first hot plug conversion unit is in communication with the control terminal of the second hot plug conversion unit and the communication terminal of the first hot plug conversion unit is in communication with the communication terminal of the second hot plug conversion unit.
9. The circuit of claim 6, wherein the device side module to be plugged further comprises a second pull-down resistor, and wherein the enable terminal of the power supply unit is further grounded through the second pull-down resistor.
10. The circuit of claim 6, wherein the device side module to be plugged further comprises a third pull-down resistor, and wherein the second output terminal of the power supply unit is further grounded through the third pull-down resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421508695.XU CN222897059U (en) | 2024-06-28 | 2024-06-28 | Hot-swap protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421508695.XU CN222897059U (en) | 2024-06-28 | 2024-06-28 | Hot-swap protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN222897059U true CN222897059U (en) | 2025-05-23 |
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ID=95720268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202421508695.XU Active CN222897059U (en) | 2024-06-28 | 2024-06-28 | Hot-swap protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN222897059U (en) |
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2024
- 2024-06-28 CN CN202421508695.XU patent/CN222897059U/en active Active
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