CN217133344U - Plug-in interface protection circuit applied to plug-in monitoring equipment - Google Patents
Plug-in interface protection circuit applied to plug-in monitoring equipment Download PDFInfo
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- CN217133344U CN217133344U CN202123108746.9U CN202123108746U CN217133344U CN 217133344 U CN217133344 U CN 217133344U CN 202123108746 U CN202123108746 U CN 202123108746U CN 217133344 U CN217133344 U CN 217133344U
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Abstract
The utility model relates to the technical field of medical equipment, in particular to a plug-in interface protection circuit applied to plug-in monitoring equipment, which comprises a control circuit; the plug detection circuit is used for detecting the plug state of the plug port, and the control circuit outputs a control signal based on a detection result of the plug detection circuit; the power switch circuit is connected with the control circuit at one end and connected with the power port at the other end, the power switch circuit supplies power to the plug-in module inserted into the plug-in port through the power port, and the control circuit controls the action of the power switch circuit based on the control signal; and one end of the communication module is connected with the control circuit, the other end of the communication module is connected with the communication port, and the control signal is also used for controlling the action of the communication module. Through the detection and analysis of the plugging interface, the power supply and the communication management in the plugging process of the plug-in module are realized, the safety of the plugging interface is ensured, and the structure is simplified.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to be applied to plug-in components formula monitoring facilities's plug interface protection circuit.
Background
The plug-in type monitor is provided with a plug-in box, and different plug-in modules can be inserted to expand the functions of the monitor. The plug-in box and the plug-in module belong to different components in a plug-in system, and the plug-in box and the plug-in module need to supply power and communicate through media.
If the contact type interface is adopted for connecting communication, when the plug-in module is inserted into the electrified plug-in box, the power supply, the ground and the input/output interface in the plug-in module are almost simultaneously contacted with the power supply, the ground and the signal wire in the plug-in box. Due to the large capacitance of the single-board power supply in the plug-in module, the impact current and voltage instability of the plug-in system power supply can be caused, and a current path from the input/output port to the power supply plane or the ground plane exists, so that backward flow is formed, and the interface device is damaged. The same applies to the case of live wire extraction.
At present, most plug-in systems adopt an optical coupling isolation communication mode, as shown in fig. 1, an infrared isolation communication scheme is adopted, and infrared transceiver modules need to be respectively placed in a plug-in box and a slot module to meet communication requirements. However, the ir transceiver module itself has a low communication speed and needs additional encoding and decoding, so the transmission efficiency of the system is low. In addition, infrared communication is actually optical communication, requirements on distance and direction are met, and structural design is relatively troublesome.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a plug interface protection circuit for plug-in monitor device, so as to solve the problem of plug interface safety and complex structure.
According to a first aspect, the embodiment of the utility model provides a be applied to plug-in components formula guardianship equipment's plug interface protection circuit, include:
a control circuit;
the plug detection circuit is used for detecting the plug state of the plug port, and the control circuit outputs a control signal based on a detection result of the plug detection circuit;
the power switch circuit is connected with the control circuit at one end and connected with a power port at the other end, the power switch circuit supplies power to a plug-in module inserted into the plug-in port through the power port, and the control circuit controls the action of the power switch circuit based on the control signal;
and one end of the communication module is connected with the control circuit, the other end of the communication module is connected with the communication port, and the control signal is also used for controlling the action of the communication module.
The embodiment of the utility model provides a be applied to plug-in components formula supervisory equipment's plug interface protection circuit detects the plug state of plug port through plug detection circuit to the testing result with plug detection circuit inputs the action of control circuit's processing back control power switch circuit and communication module in the control circuit, through the detection and the analysis to the plug interface promptly, realize power and communication management in the plug-in components module plug-in components process, hot plug influence when avoiding plug-in components module to use contact type interface connection, the security of plug interface has been guaranteed; and the data transmission is carried out by adopting a direct communication mode, compiling conversion is not needed, the structure is simplified, the time for transmitting large data volume can be shortened, and the transmission efficiency is effectively improved.
With reference to the first aspect, in a first implementation manner of the first aspect, the plugging detection circuit includes:
a first power supply;
the first end of the first resistor is connected with the first power supply, and the second end of the first resistor is connected with the plugging port and the control circuit respectively.
When a plug-in module is inserted into the plug-in port, the first resistor divides voltage, and the voltage value output by the second end of the first resistor is smaller than that of the first power supply; when the plug-in module is not inserted into the plug-in port, the voltage value output by the second end of the first resistor is equal to the voltage value of the first power supply, whether the plug-in port is inserted with the plug-in module or not can be determined through the change of the voltage value of the second end of the first resistor, namely, the plug-in detection can be realized through a simple circuit.
With reference to the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the control circuit includes:
a reference power supply circuit;
and a first input end of the comparator is connected with a second end of the first resistor, a second input end of the comparator is connected to the reference power supply circuit, and an output end of the comparator is respectively connected with the power supply switch circuit and the communication module.
The embodiment of the utility model provides a be applied to plug-in components formula guardianship equipment's plug interface protection circuit compares with reference power supply circuit's output voltage through the output voltage of comparator to the second end of first resistance, promptly, carries out logic analysis, confirms whether has the inserting of plug-in components module, has simplified circuit structure.
With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the reference power supply circuit includes:
the first end of the third resistor is connected with the first power supply, the second end of the third resistor is respectively connected with the first end of the fourth resistor and the second input end of the comparator, and the second end of the fourth resistor is grounded.
The embodiment of the utility model provides a be applied to plug-in components formula guardianship equipment's plug interface protection circuit through the mode of third resistance and fourth resistance partial pressure, realizes the partial pressure to first power to determine the reference voltage value, realize avoiding the introduction of extra power with a first power of plug detection circuitry sharing.
With reference to the third implementation manner of the first aspect, in the fourth implementation manner of the first aspect, the resistance value of the first resistor is greater than the resistance value of the resistor in the plug-in module, and the resistance value of the third resistor is equal to the resistance value of the fourth resistor.
The embodiment of the utility model provides a be applied to plug-in components formula guardianship equipment's plug interface protection circuit sets up through the resistance to first resistance, second resistance, third resistance and fourth resistance, when avoiding extra power to introduce, can simplify control circuit's realization.
With reference to the second implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the control circuit further includes:
and the first end of the AND gate is connected with the output end of the comparator, the second end of the AND gate is connected with an enable signal, and the output of the AND gate is respectively connected with the power switch circuit and the communication module.
The embodiment of the utility model provides a be applied to plug-in components formula guardianship equipment's plug interface protection circuit, through the setting of AND gate in control circuit for control signal's output is not only relevant with plug detection circuitry's testing result, still is relevant with enable signal, has further guaranteed the security of plug port.
With reference to the first aspect, in a sixth implementation manner of the first aspect, the power switching circuit includes:
the input end of the power switch unit is connected with the output end of the control circuit, and the output end of the power switch unit is connected with one end of the overcurrent protection circuit;
and the other end of the overcurrent protection circuit is connected with the communication port.
The embodiment of the utility model provides a be applied to plug-in components formula monitoring equipment's plug interface protection circuit sets up the overcurrent protection circuit in switch circuit, provides overcurrent protection, has guaranteed this plug-in components formula monitoring equipment's reliability.
With reference to the sixth implementation manner of the first aspect, in a seventh implementation manner of the first aspect, the over-current protection circuit includes:
the first end of the thermistor is connected with the output end of the power switch unit, and the other end of the thermistor is connected with the communication port;
and one end of the protection unit is connected with the thermistor, and the other end of the protection unit is grounded.
The embodiment of the utility model provides a be applied to plug-in components formula monitoring equipment's plug interface protection circuit can realize resetting overcurrent protection through thermistor, reduces the surge current that produces when the hot plug.
With reference to the seventh implementation manner of the first aspect, in an eighth implementation manner of the first aspect, the protection unit includes:
one end of the capacitor is connected with the first end of the thermistor, and the other end of the capacitor is grounded;
and one end of the voltage stabilizing diode is connected with the second end of the thermistor, and the other end of the voltage stabilizing diode is grounded.
The embodiment of the utility model provides a be applied to plug-in components formula monitoring facilities's plug interface protection circuit realizes the filtering through electric capacity, and zener diode realizes the steady voltage, has further guaranteed switch circuit's reliability, and then has guaranteed this plug-in components formula monitoring facilities's security.
According to a second aspect, the present invention provides a plug-in monitor device, including: the monitor main part, the monitor main part has the plug-in components case that is used for placing plug-in components module, the monitor main part includes the utility model discloses the first aspect, or in any embodiment of the first aspect plug-in components formula monitoring equipment's plug interface protection circuit is applied to.
According to a third aspect, the embodiments of the present invention further provide a plug-in monitoring system, including:
the utility model relates to a plug-in monitoring device of the second aspect;
at least one plug-in module, when at least one plug-in module inserts the plug-in box, with plug port, power port and communication port are connected.
The embodiment of the utility model provides a plug-in components formula monitor system detects the plug-in state of plug-in components port through plug detection circuitry to the action of control switch circuit and communication module after control circuit's processing is inputted into control circuit with the testing result of plug detection circuitry, promptly through detection and analysis to plug-in components interface, realizes power and communication management in plug-in components module plug-in components process, avoids plug-in components module to use the hot plug influence when contact type interface connection, has guaranteed the security of plug-in components interface; and the data transmission is carried out by adopting a direct communication mode, compiling conversion is not needed, the structure is simplified, the time for transmitting large data volume can be shortened, and the transmission efficiency is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a block diagram of a prior art plug-in monitoring device;
fig. 2 is a block diagram of a plug interface protection circuit applied to a plug-in monitoring device according to an embodiment of the present invention;
fig. 3 is a block diagram of a plug interface protection circuit applied to a plug-in monitoring device according to an embodiment of the present invention;
fig. 4 is a block diagram of a plug interface protection circuit applied to a plug-in monitoring device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a plug interface protection circuit applied to a plug-in monitoring device according to an embodiment of the present invention;
fig. 6 is a block diagram of a plug interface protection circuit applied to a plug-in monitoring device according to an embodiment of the present invention;
fig. 7 is a block diagram of a plug-in monitoring system according to an embodiment of the present invention;
fig. 8 is a block diagram of a plug-in monitoring system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a plug-in components formula guardianship equipment, this plug-in components formula guardianship equipment are used for being connected with the plug-in components module to extend this plug-in components formula guardianship equipment's guardianship function. Wherein, the plug-in module is directly plugged in the plug-in type monitoring equipment. When the plug-in module is plugged in the plug-in monitoring equipment, the plug-in monitoring equipment is directly in communication connection with the plug-in module without data conversion.
The plug-in monitoring equipment is provided with a plug-in interface protection circuit, and the plug-in interface protection circuit detects whether the plug-in port is plugged into the plug-in module through the plug-in detection circuit so as to determine the plug-in state of the plug-in port. And then the control circuit is used for controlling the actions of the power switch circuit and the communication module based on the plugging state of the plugging port so as to ensure the normal work of the plugging module. The plug-in interface protection circuit controls the action of the power switch circuit and the communication module only when the plug-in port is detected to be plugged in by the plug-in module, so that the reliability of the plug-in monitoring equipment is ensured.
The embodiment of the utility model provides a be applied to plug-in components formula monitoring equipment's plug interface protection circuit, as shown in fig. 2, this plug interface protection circuit 1 includes plug detection circuitry 10, switch circuit 20, communication circuit 30, control circuit 40, plug port P1, power port P2 and communication port P3. Specifically, one end of the plugging detection circuit 10 is connected to the plugging port, and the other end is connected to the control circuit, and the plugging detection circuit 10 is configured to detect a plugging state of the plugging port P1. The plug detection circuit 10 may be a voltage detection circuit disposed at the plug port, and is configured to detect a voltage of the plug port P1; the plugging detection circuit 10 may be a circuit formed by a resistor, a power supply, or the like, and determines the plugging state of the plugging port P1 by the voltage change of the plugging detection circuit 10; alternatively, the plugging detection circuit 10 may be implemented in other manners.
As shown in fig. 2, the power switching circuit 20 has one end connected to the control circuit and the other end connected to the power port P2. The power switch circuit 20 provides power through a power port P2 plug-in module plugged into the plug-in port P1. The power switch circuit 20 may be implemented by a power chip or based on a controllable switch, and the specific circuit structure is not limited herein and may be set according to actual requirements. Specifically, when it is detected that a plug-in module is inserted into the plug-in port P1, the power switch circuit 20 is turned on, and power is supplied to the plug-in module inserted into the plug-in port P1 through the power port P2; when the plug-in port P1 has no plug-in module inserted, the power switch circuit 20 is turned off, and the plug-in port P1 has no power signal.
The communication module 30 has one end connected to the control circuit 40 and the other end connected to the communication port P3. In particular, the communication module 30 is used to enable a communication connection between the plug-in module and the plug-in monitoring device. Wherein the communication module 30 provides a controllable communication link to implement level shifting to match the logic level of the signal line of the plug-in module. The selected communication module 30 is used for avoiding the problems of backward flowing of interface signal current to a power supply pin and bus collision during plugging by supporting Ioff and PU3S characteristics.
The control circuit 40 is configured to output a control signal based on the detection result of the plugging detection circuit 10 to control the operations of the power switch circuit 20 and the communication module 30. The control circuit 40 may be implemented by a controller, or may be implemented by a hardware circuit, such as a comparator. Taking a comparator as an example, two input ends of the comparator are respectively connected with an output end of the plugging detection circuit and a reference power supply, and the comparator compares the output voltage of the plugging detection circuit with the reference power supply and outputs a control signal. The control signal is distinguished by 0 or 1, for example, when the control signal is 0, it indicates that the plug-in port P1 has no plug-in module inserted at this time, controls the power switch circuit 20 to be powered off, and prohibits the communication of the communication module 30; when the control signal is 1, it indicates that a plug-in module is inserted into the plug-in port P2 at this time, the control power switch circuit 20 supplies power to the plug-in module, and the control communication module 30 is in communication connection with the plug-in module.
The control signal output by the control circuit 40 may directly control the operations of the power switch circuit 20 and the communication module 30; the control signals may be logically processed according to requirements, and then the operations of the power switch circuit 20 and the communication module 30 may be controlled.
According to the plug-in interface protection circuit applied to the plug-in monitoring equipment, the plug-in state of the plug-in port is detected through the plug-in detection circuit, the detection result of the plug-in detection circuit is input into the control circuit and is processed by the control circuit, and then the actions of the power switch circuit and the communication module are controlled, namely, through the detection and analysis of the plug-in interface, the power supply and communication management in the plug-in process of the plug-in module is realized, the hot plug influence of the plug-in module when a contact type interface is used for connection is avoided, and the safety of the plug-in interface is ensured; and the data transmission is carried out by adopting a direct communication mode, compiling conversion is not needed, the structure is simplified, the time for transmitting large data volume can be shortened, and the transmission efficiency is effectively improved.
In some optional implementations of this embodiment, as shown in fig. 3, the plug interface protection circuit 101, wherein the control circuit is implemented by a hardware circuit. Alternatively, a plug-in monitoring device 401 as shown in fig. 6, wherein the control circuit is implemented based on a controller 403 and corresponding software algorithms.
Specifically, as shown in fig. 3, the control circuit includes the comparator 105 and a reference power supply circuit (not shown in fig. 3). A first input terminal of the comparator 105 is connected to the output terminal of the plugging detection circuit 104, a second input terminal is connected to the output terminal of the reference power supply circuit, and the comparator 105 is configured to compare the output voltage of the plugging detection circuit 104 with the output voltage of the reference power supply circuit, and determine a corresponding control signal based on the comparison result. The output voltage of the second end of the first resistor is compared with the output voltage of the reference power supply circuit through the comparator, namely, logic analysis is carried out to determine whether a plug-in module is inserted, and the circuit structure is simplified.
Optionally, as shown in fig. 3, the control circuit further includes an and gate 106, a first terminal of the and gate 106 is connected to the output terminal of the comparator 105, a second terminal of the and gate 106 is connected to the enable signal, and outputs of the and gate 106 are respectively connected to the power switch circuit 20 and the communication module 30. Wherein the enable signal is used to enable the plug-in module, if the enable signal is not valid, the power switch circuit 20 and the communication module 30 are still not available due to the presence of the and gate 106. The power switch circuit 20 and the communication module 30 are operable only when the plug port P1 is detected as being plugged into the plug-in module and the enable signal is asserted.
The reference power supply circuit can be a preset power supply or a power supply provided by other modes, and is not limited at all, and only the second input end of the comparator is required to have reference voltage.
As a specific application example of the present embodiment, as shown in fig. 5, the plugging detection circuit 202 includes a first power source Vcc and a first resistor R1. The first end of the first resistor R1 is connected to the first power Vcc, and the second end of the first resistor is connected to the plug port P1 and the control circuit, respectively. The operation principle of the plugging detection circuit 202 is as follows: when the plug-in port is not plugged in with the plug-in module, the voltage at the point a in fig. 5 is Vcc; when the plug-in module is plugged into the plug port, the voltage at the point A in FIG. 5 is less than Vcc due to the presence of the first resistor R1. Based on this, the subsequent control circuit can determine whether the plug-in port has the plug-in module according to the change of the voltage of the point A.
Further, as shown in fig. 5, the control circuit includes a comparator circuit 204 and an and gate 205. The comparator circuit 204 comprises a comparator U1 and a reference power circuit, the reference power circuit comprises a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 is connected with a first power Vcc, a second end of the third resistor R3 is connected with a first end of the fourth resistor R4 and a second input end of the comparator U1, and a second end of the fourth resistor is grounded. The voltage division of the first power supply is realized through the voltage division mode of the third resistor and the fourth resistor, so that the reference voltage value is determined, the first power supply is shared by the plugging detection circuit, and the introduction of an additional power supply is avoided.
The resistance value of the first resistor is larger than that of the resistor in the plug-in module, and the resistance value of the third resistor is equal to that of the fourth resistor. As shown in fig. 5, the resistance in the plug-in module 203 is a second resistance R2. Through setting up the resistance of first resistance, second resistance, third resistance and fourth resistance, when avoiding extra power to introduce, can simplify control circuit's realization.
Specifically, since the resistance of the third resistor is equal to the resistance of the fourth resistor, the voltage of the second input terminal of the comparator is Vcc/2, i.e., the reference voltage of the comparator is Vcc/2. Since the resistance of the first resistor is greater than that of the second resistor, when the plug-in module is inserted into the plug-in port, the voltage at the point a in fig. 5 is less than Vcc/2 due to the voltage division of the first resistor R1 and the second resistor R2; when the plug-in module is not inserted into the plug-in port, the voltage at the point a in fig. 5 is Vcc. For a comparator, the second input terminal of the comparator is a positive terminal and the first input terminal is a negative terminal. When the plug-in module is not plugged into the plug-in port, the voltage of the first input end is Vcc which is higher than the reference voltage Vcc/2 of the second input end, and the comparator outputs a low level; when the plug-in module is plugged into the plug-in port, the voltage of the first input end is less than Vcc/2 and lower than the reference voltage of the first input end, and the comparator outputs high level.
It should be noted that, the reference voltage of the comparator, that is, the second input terminal is the positive terminal of the comparator, or the negative terminal of the comparator, which is not limited herein, and may be set specifically according to actual requirements, and is not limited to that shown in fig. 5.
Correspondingly, subsequent power switch circuit and communication module are that the high level is effective, and still low level is effective, all sets up according to actual demand. The power switch circuit and the communication module are only required to be switched on when the plug-in module is inserted into the plug-in port and the enable signal is valid, and when the plug-in module is pulled out or the enable signal is invalid, the power switch circuit and the communication module are switched off.
In some optional embodiments of this embodiment, as shown in fig. 4, when the communication module 110 is active low and the plug-in module is inserted into the plug port, the output of the and gate 106 is high. Based on this, a not gate 109 is provided between the output of the and gate 106 and the input of the communication module 110 for inverting the signal output by the and gate 106. Further, in order to enable communication with the plug-in module, a controller 103 is also provided in the plug-in monitoring device for providing an enabling signal to the and gate 106 and communicating with the plug-in module via the communication module 110.
As an optional implementation manner of this embodiment, the power switch circuit includes a power switch unit and an overcurrent protection circuit. The input end of the power switch unit is connected with the output end of the control circuit, and the output end of the power switch unit is connected with one end of the overcurrent protection circuit; the other end of the overcurrent protection circuit is connected to the communication port P2.
Corresponding to the two setting modes of the control circuit, as shown in fig. 3, the power switch circuit includes a power switch unit 107 and an overcurrent protection circuit 108. Two ends of the power switch unit 107 are connected to the and gate 106 and the overcurrent protection circuit 108, respectively. As shown in the plug-in monitoring device 401 of fig. 6, the power switch circuit includes a power switch unit 405 and an over-current protection circuit 406. Two ends of the power switch unit 405 are connected to the controller 403 and the over-current protection circuit 406, respectively. An overcurrent protection circuit is arranged in the power switch circuit to provide overcurrent protection, so that the reliability of the plug-in monitoring equipment is ensured.
Although the control circuits in fig. 3 and 6 have different configurations, the insertion/removal detection circuit, the power switch circuit, and the communication module have the same or similar configurations. In this embodiment, the same structure is described as an example.
As shown in fig. 5, the power switching circuit includes a power switching unit 206 and an overcurrent protection circuit 207. The power switch unit 206 is set based on a controllable switch, and the structure thereof is not described herein. The overcurrent protection circuit 207 includes a thermistor and a protection unit, a first end of the thermistor PT is connected to an output end of the power switch unit 206, and the other end of the thermistor PT is connected to the communication port P2; one end of the protection unit is connected with the thermistor, and the other end of the protection unit is grounded. The thermistor can realize reset overcurrent protection and reduce surge current generated during hot plugging.
The protection unit is used for filtering and/or stabilizing the electric signal at two ends of the thermistor, and for example, as shown in fig. 5, the protection unit comprises a capacitor C5 and a voltage stabilizing diode TVS 1. Specifically, one end of the capacitor is connected with the first end of the thermistor, and the other end of the capacitor is grounded; one end of the voltage stabilizing diode is connected with the second end of the thermistor, and the other end of the voltage stabilizing diode is grounded. The filtering is realized through the capacitor, the voltage stabilizing diode realizes the voltage stabilization, the reliability of the power switch circuit is further ensured, and the safety of the plug-in monitoring equipment is further ensured.
Further, as shown in fig. 5, the and circuit 205 includes an and gate U2 and a resistor R9, wherein the resistor R9 is connected to the first power source Vcc. The resistor R9 is set to pull up the second input of the and gate to the first power supply Vcc, ensuring that the initial level of the and gate is high.
The communication module 209 in fig. 5 is active low, and based on this, the not gate 208 is connected to the output terminal of the and gate U2, and is used to perform inverse processing on the output signal of the and gate U2 and then input the enabled communication module 209. As shown in fig. 5, the plug-in monitoring device further includes a controller MCU201 for outputting the enable signal to the and gate and performing communication connection with the plug-in module. Further, the plug-in monitoring device includes a plug-in port P1, a power port and a communication port through the connection port 210 of the plug-in module.
Taking the plug-in monitoring device shown in fig. 5 as an example, the working principle of the plug-in monitoring device is as follows: when the plug-in module is not plugged into the plug-in port, the voltage of the point A is equal to Vcc, the voltage of the negative terminal of the comparator U1 is greater than the voltage of the positive terminal, and the low level is output. The enable signal EN output by the MCU is high level by default, the AND gate U2 outputs low level, the power switch unit is provided with Q1 and Q2 which are not conducted, and the power is turned off. The output low level of the AND gate U2 changes to high level after passing through the NOT gate U3, and the communication module U4 is disconnected and does not communicate because the enable pin of the communication module U4 is active low.
When the plug-in module is inserted into the plug-in port, the voltage of the point A is changed from Vcc to be less than Vcc/2 because the resistor R2 in the plug-in module is connected and divided. The voltage at point a is compared with the reference voltage Vcc/2 of the comparator U1 and outputs high, and the and gate U2 outputs high. The high output of the and gate U2 turns on Q1 and Q2 in the power switch unit, and the power is output. The high level of the output of the and gate U2 goes to low level through the not gate U3, and the communication module U4 is turned on to allow communication. Because the plug-in monitoring equipment turns on the power supply and the communication circuit after the plug-in module confirms to be plugged in, and the power supply output passes through the thermistor, the surge current of the power supply path in the plugging process can be effectively inhibited, and the current of the signal path is prevented from flowing backwards.
The plug-in module is pulled out normally and directly, and the two pulling-out modes can realize timely turning off the power supply and disconnecting the communication circuit when being pulled out, so that the current on a signal path is effectively prevented from flowing backwards.
Specifically, the normal unplugging process means that the plug-in module informs the plug-in monitoring device of the need to be unplugged through a signal, and the plug-in module is unplugged after the plug-in monitoring device responds. When the MCU of the plug-in monitoring equipment receives a signal needing to be pulled out, the EN signal is pulled down, the U2 outputs low level, Q1 and Q2 in the power switch unit are turned off, and the power supply is turned off; the output low level of the U2 is changed into high level after passing through a NOT gate of the U3, so that the communication module U4 is disconnected and does not communicate.
The direct pulling-out means that the plug-in module does not send information in advance to inform that the plug-in monitoring equipment needs to be pulled out, but directly pulls out the plug-in module. When the direct plug-out is carried out, the R1 and the R2 are disconnected, the level of the point A is pulled to Vcc, the comparator U1 outputs low level, the U2 outputs low level, Q1 and Q2 in the power switch unit are closed, and the power supply is closed; the output low level of the U2 is changed into high level after passing through a U3 NOT gate, so that the U4 communication circuit is disconnected and does not communicate.
In conclusion, the circuit scheme realizes that the power supply and the communication circuit are timely turned on when the plug-in module is plugged in; when the plug-in monitoring device is pulled out, the communication circuit and the power supply are quickly switched off by utilizing the circuit characteristics, the problems of power supply fluctuation and signal current backflow in the hot plug process are solved, the device is prevented from being damaged, and the purpose of hardware safety communication of the plug-in monitoring device is achieved.
If the MCU has redundant ports to meet the application requirements, to further save the cost of the solution, it can be simplified to the solution shown in fig. 6, and the hardware level conversion logics such as comparator, and gate, nor gate, etc. are processed by the MCU software, so as to achieve the purpose of secure hardware communication of the plug-in system. The specific control logic is as follows:
when the plug-in module is not inserted into the plug-in type monitoring equipment, the MCU sets the port B 'to output a low level and the port C' to output a high level; when the plug-in module is inserted into the plug-in monitoring device, after the MCU detects that the level of the A ' port is pulled down from high, the MCU sets the B ' port to output high level, turns on the power switch circuit, sets the C ' port to output low level, and turns on the communication module.
When the plug-in module is normally pulled out, the MCU receives a signal to be pulled out, sets the port B 'to output a low level, closes the power switch circuit, sets the port C' to output a high level, and closes the communication module; when the plug-in module is directly pulled out, after the MCU detects that the level of the A ' port is pulled high from low, the MCU sets the B ' port to output low level, closes the power switch circuit, sets the C ' port to output high level, and closes the communication module.
An embodiment of the utility model provides a plug-in components formula guardianship equipment, including the monitor main part, have the plug-in components case that is used for placing the plug-in components module, this monitor main part includes in any embodiment of the aforesaid plug interface protection circuit. The plug-in box for placing the plug-in modules is not limited to be placed in the plug-in box, and the plug-in modules can be placed outside the plug-in box in an external connection mode, and the like.
The embodiment of the utility model provides a plug-in components formula monitor system is still provided, including plug-in components formula monitoring facilities and at least one plug-in components module. When at least one plug-in module is inserted into the plug-in box, the plug-in module is connected with the plug-in port, the power port and the communication port on the plug-in monitoring equipment. For the specific structure of the plug-in monitoring device, please refer to the above description, which is not repeated herein.
As shown in fig. 7, the plug-in monitoring system includes a plug-in monitoring device 101 and a plug-in module 102, wherein P1 ' of the plug-in module 102 corresponds to a plug-in port P1 of the plug-in monitoring device 101, P2 ' of the plug-in module 102 corresponds to a power port P2 of the plug-in monitoring device 101, and P3 ' of the plug-in module 102 corresponds to a communication port P3 of the plug-in monitoring device 101.
As shown in fig. 8, the plug-in monitoring system includes a plug-in monitoring device 401 and a plug-in module 402, where P1 ' in the plug-in module 402 corresponds to a plug-in port P1 of the plug-in monitoring device 401, P2 ' in the plug-in module 402 corresponds to a power port P2 of the plug-in monitoring device 401, and P3 ' in the plug-in module 402 corresponds to a communication port P3 of the plug-in monitoring device 401.
The embodiment of the utility model provides a plug-in components formula monitor system detects the plug-in state of plug-in components port through plug detection circuitry to the testing result of plug-in components detection circuitry is imported the action of control power switch circuit and communication module in control circuit's processing, promptly through the detection and the analysis to plug-in components interface, realizes power and communication management in the plug-in components module plug-in components process, avoids plug-in components module to use the hot plug influence when contact type interface connection, has guaranteed the security of plug-in components interface; and the data transmission is carried out by adopting a direct communication mode, compiling conversion is not needed, the structure is simplified, the time for transmitting large data volume can be shortened, and the transmission efficiency is effectively improved.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (11)
1. A plug interface protection circuit applied to plug-in monitoring equipment is characterized by comprising:
a control circuit;
the plugging detection circuit is used for detecting the plugging state of the plugging port, and the control circuit outputs a control signal based on a detection result of the plugging detection circuit;
the power switch circuit is connected with the control circuit at one end and connected with a power port at the other end, the power switch circuit supplies power to a plug-in module inserted into the plug-in port through the power port, and the control circuit controls the action of the power switch circuit based on the control signal;
and one end of the communication module is connected with the control circuit, the other end of the communication module is connected with the communication port, and the control signal is also used for controlling the action of the communication module.
2. The plug interface protection circuit according to claim 1, wherein the plug detection circuit comprises:
a first power supply;
the first end of the first resistor is connected with the first power supply, and the second end of the first resistor is respectively connected with the plugging port and the control circuit.
3. The plug interface protection circuit of claim 2, wherein the control circuit comprises:
a reference power supply circuit;
and a first input end of the comparator is connected with a second end of the first resistor, a second input end of the comparator is connected to the reference power supply circuit, and an output end of the comparator is respectively connected with the power supply switch circuit and the communication module.
4. The plug interface protection circuit of claim 3, wherein the reference power supply circuit comprises:
the first end of the third resistor is connected with the first power supply, the second end of the third resistor is respectively connected with the first end of the fourth resistor and the second input end of the comparator, and the second end of the fourth resistor is grounded.
5. The plug interface protection circuit according to claim 4, wherein a resistance value of the first resistor is greater than a resistance value of a resistor in the plug-in module, and a resistance value of the third resistor is equal to a resistance value of the fourth resistor.
6. The plug interface protection circuit of claim 3, wherein the control circuit further comprises:
and the first end of the AND gate is connected with the output end of the comparator, the second end of the AND gate is connected with an enable signal, and the output of the AND gate is respectively connected with the power switch circuit and the communication module.
7. The plug interface protection circuit of claim 1, wherein the power switching circuit comprises:
the input end of the power switch unit is connected with the output end of the control circuit, and the output end of the power switch unit is connected with one end of the overcurrent protection circuit;
and the other end of the overcurrent protection circuit is connected with the communication port.
8. The plug interface protection circuit of claim 7, wherein the over-current protection circuit comprises:
the first end of the thermistor is connected with the output end of the power switch unit, and the other end of the thermistor is connected with the communication port;
and one end of the protection unit is connected with the thermistor, and the other end of the protection unit is grounded.
9. The plug interface protection circuit according to claim 8, wherein the protection unit comprises:
one end of the capacitor is connected with the first end of the thermistor, and the other end of the capacitor is grounded;
and one end of the voltage stabilizing diode is connected with the second end of the thermistor, and the other end of the voltage stabilizing diode is grounded.
10. An on-board monitoring device comprising: a monitor main body, wherein the monitor main body is provided with a plug-in box for placing a plug-in module, and the monitor main body comprises the plug-in interface protection circuit applied to the plug-in monitoring device as claimed in any one of claims 1 to 9.
11. A plug-in monitoring system, comprising:
the on-board monitoring device of claim 10;
at least one plug-in module, when at least one plug-in module inserts the plug-in box, with plug port, power port and communication port are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123108746.9U CN217133344U (en) | 2021-12-10 | 2021-12-10 | Plug-in interface protection circuit applied to plug-in monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123108746.9U CN217133344U (en) | 2021-12-10 | 2021-12-10 | Plug-in interface protection circuit applied to plug-in monitoring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217133344U true CN217133344U (en) | 2022-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123108746.9U Active CN217133344U (en) | 2021-12-10 | 2021-12-10 | Plug-in interface protection circuit applied to plug-in monitoring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217133344U (en) |
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2021
- 2021-12-10 CN CN202123108746.9U patent/CN217133344U/en active Active
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