CN210744733U - Anti-static protection circuit and monitor - Google Patents
Anti-static protection circuit and monitor Download PDFInfo
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- CN210744733U CN210744733U CN201921782154.5U CN201921782154U CN210744733U CN 210744733 U CN210744733 U CN 210744733U CN 201921782154 U CN201921782154 U CN 201921782154U CN 210744733 U CN210744733 U CN 210744733U
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Abstract
The application discloses prevent electrostatic protection circuit and monitor should prevent electrostatic protection circuit and include: the input end of the first anti-static protection unit is used for connecting external accessories; an optical coupling isolation unit; the output end of the second anti-static protection unit is used for being connected with the processor; the first anti-static protection unit and the second anti-static protection unit are connected through the optical coupling isolation unit; the first anti-static protection unit includes: and the voltage limiting element is connected between the input end of the first anti-static protection unit and the ground end so as to be conducted when the input end of the first anti-static protection unit generates static electricity and lead the static electricity into the ground end. The anti-static protection circuit provided by the application can ensure that a processor connected with the anti-static protection circuit receives high-quality signals.
Description
Technical Field
The application relates to the technical field of circuits, in particular to an anti-static protection circuit and a monitor.
Background
Electrostatic discharge is a physical phenomenon in which objects of different electrostatic potentials approach each other or directly contact each other to cause charge transfer, and is the largest potential cause of excessive electrical stress damage to electronic components or integrated circuit systems, while the human body is a relatively serious electrostatic source.
When the medical monitor continuously monitors physiological parameters of a patient, such as blood oxygen, blood pressure, body temperature and the like, the medical monitor is inevitably frequently used for contacting the patient, and static electricity is likely to be generated in the contacting process. Static electricity can break down the integrated circuits and electronic components of the medical monitor causing it to malfunction or malfunction. Therefore, it is generally necessary to provide an anti-static protection circuit at the monitor interface to reduce the influence of the anti-static protection circuit on the medical monitor.
The inventor of the application finds that the current anti-static protection circuit is difficult to ensure that the medical monitor receives high-quality signals.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application mainly solved provides an prevent electrostatic protection circuit and medical monitor, can guarantee that the treater that is connected with preventing electrostatic protection circuit receives high-quality signal.
In order to solve the technical problem, the application adopts a technical scheme that: provided is an anti-static protection circuit including: the input end of the first anti-static protection unit is used for connecting external accessories; an optical coupling isolation unit; the output end of the second anti-static protection unit is used for being connected with the processor; the first anti-static protection unit and the second anti-static protection unit are connected through the optical coupling isolation unit; the first anti-static protection unit includes: and the voltage limiting element is connected between the input end of the first anti-static protection unit and the ground end so as to be conducted when the input end of the first anti-static protection unit generates static electricity and lead the static electricity to the ground end.
In order to solve the above technical problem, another technical solution adopted by the present application is: the monitor comprises an interface for connecting an external accessory, a processor for processing data sent by the external accessory and the anti-static protection circuit connected between the interface and the processor.
The beneficial effect of this application is: different from the prior art, this application prevents that electrostatic protection circuit includes first anti-static protection unit, second prevents electrostatic protection unit and connects opto-coupler isolation unit between them, and wherein first anti-static protection unit includes the voltage limiting element, connects between the input of first anti-static protection unit and ground to switch on when the input of first anti-static protection unit produces static and lead in static to ground. The utility model provides an antistatic protection circuit can guarantee to eliminate static through setting up the two-stage antistatic protection unit on the one hand, and on the other hand is through setting up opto-coupler isolation unit, can realize signal isolation and electrical isolation between external annex and the monitor, avoids both to influence each other, finally guarantees that the treater receives the high-quality signal that external annex sent.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic structural diagram of an embodiment of an anti-ESD protection circuit according to the present application;
FIG. 2 is a schematic diagram of the electrostatic protection circuit of FIG. 1 used in a medical device;
FIG. 3 is a schematic structural diagram of another embodiment of an anti-electrostatic protection circuit according to the present application;
FIG. 4 is a schematic diagram of the electrostatic protection circuit of FIG. 3 used in a medical device;
fig. 5 is a schematic structural diagram of an embodiment of the monitor of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 2, fig. 1 is a schematic structural diagram of an embodiment of an anti-static protection circuit of the present application, and fig. 2 is a schematic structural diagram of the anti-static protection circuit in fig. 1 applied to a medical device.
When the anti-static protection circuit 1000 of the present embodiment is used in the medical device 2000, the anti-static protection circuit 1000 is disposed in a monitor 2100, the monitor 2100 is connected to the external accessory 2200 and receives data transmitted from the external accessory 2200, wherein the monitor 2100 comprises an interface 2110 for connecting to the external accessory 2200 and a processor 2120 for processing data transmitted from the external accessory 2200, and the anti-static protection circuit 1000 is connected between the interface 2110 and the processor 2120.
The external accessory 2200 may be specifically an accessory for measuring body temperature, blood pressure, or blood oxygen, and is not limited herein.
Meanwhile, the anti-static protection circuit 1000 in this embodiment may be used not only in devices in the medical field, but also in devices in other fields, such as the industrial field, without limitation. For convenience of explanation, the following description will discuss the electrostatic discharge protection circuit 1000 in the medical device 2000.
With continued reference to fig. 1 and fig. 2, the anti-static protection circuit 1000 includes a first anti-static protection unit 1100, an optical coupling isolation unit 1200, and a second anti-static protection unit 1300.
The input terminal 1101 of the first anti-static protection unit 1100 is used for connecting an external accessory 2200,
the output end 1302 of the second anti-static protection unit 1300 is used for connecting the processor 2120, and meanwhile, the first anti-static protection unit 1100 and the second anti-static protection unit 1300 are connected through the optical coupling isolation unit 1200. The optical coupling isolation unit 1200 is used to realize signal isolation and electrical isolation between the external accessory 2200 and the monitor 2100, so as to avoid mutual influence between the external accessory 2200 and the monitor 2100.
The first anti-static protection unit 1100 includes a voltage limiting element 1120.
The voltage limiting element 1120 is connected between the input terminal 1101 of the first anti-static protection unit 1100 and the ground 1140, so as to conduct when the input terminal 1101 of the first anti-static protection unit 1100 generates static electricity, and to conduct the static electricity to the ground 1140. That is, the voltage limiting element 1120 is in an off state when the input terminal 1101 of the first anti-static electricity protection unit 1100 generates no static electricity, and is in an on state when the input terminal 1101 of the first anti-static electricity protection unit 1100 generates static electricity.
Specifically, the first anti-static protection unit 1100 achieves a first anti-static protection function through the limiting element 1120 therein, and then in order to avoid that the first anti-static protection unit 1100 cannot eliminate all static electricity, the second anti-static protection unit 1300 may also consume residual static electricity, that is, the anti-static protection circuit 1000 in this embodiment can achieve two-stage static protection.
As can be seen from the above, the anti-static protection circuit 1000 in this embodiment can implement two-stage anti-static protection to ensure static elimination, and on the other hand, the optical coupling isolation unit 1200 can ensure signal isolation and electrical isolation between the external accessory 2200 and the monitor 2100 to avoid mutual influence therebetween, so as to finally ensure that the processor 2120 receives a high-quality signal sent by the external accessory 2200.
With continuing reference to fig. 1 and fig. 2, further, in the present embodiment, the first anti-static protection unit 1100 further includes a first not gate 1110; the second anti-static protection unit 1300 includes a second not gate 1310.
In order to distinguish the respective terminals of the first not gate 1110 and the second not gate 1310, the input terminal, the output terminal, the power terminal and the ground terminal of the first not gate 1110 are respectively defined as a first input terminal 1111, a first output terminal 1112, a first power terminal 1113 and a first ground terminal 1114, and the input terminal, the output terminal, the power terminal and the ground terminal of the second not gate 1310 are respectively defined as a second input terminal 1311, a second output terminal 1312, a second power terminal 1313 and a second ground terminal 1314.
The first input 1111 of the first not gate 1110 is used as the input 1101 of the first anti-static protection unit 1100 for connecting with the external accessory 2200, the first output 1112 is connected with the input of the opto-isolator unit 1200, the first power terminal 1113 is connected with the first power 1130, and the first ground 1114 is connected with the ground 1140.
The second input terminal 1311 of the second not gate 1310 is connected to the output terminal of the optical coupling isolation unit 1200, the second output terminal 1312 is used as the output terminal 1302 of the second anti-static protection unit 1300 to be connected to the processor 2120, the second power terminal 1312 is connected to the second power supply 1320, and the second ground terminal 1314 is connected to the ground terminal 1140.
The working principle of the anti-static protection circuit 1000 is as follows:
the voltage limiting element 1120 is in a cut-off state (high resistance state) when the input terminal 1101 of the first anti-static protection unit 1100 does not generate static electricity, and does not affect the anti-static protection circuit 1000 to transmit data sent by the external accessory 2200; when the input terminal 1101 of the first anti-static protection unit 1100 generates static electricity to cause voltage abnormality and reaches the breakdown voltage of the voltage limiting element 1120, the voltage limiting element 1120 is instantly changed from a high-resistance state to a low-configuration state, so as to provide a low-impedance conduction path for instant current and guide the static electricity into the ground terminal 1140, thereby preventing the static electricity from being transmitted into the back-end circuit to damage electronic devices or cause malfunction.
When the abnormal voltage disappears, i.e., the static electricity is removed, the voltage limiting element 1120 returns to the high-resistance state, so that the external accessory 2200 normally sends data to the processor 2120 through the anti-static protection circuit 1000.
When the external accessory 2200 transmits data to the processor 2120, a first input end 1111 of the first not gate 1110 inputs a high level signal, a first output end 1112 outputs a low level signal, then the optical coupling isolation unit 1200 is turned on after receiving the low level signal output by the first output end 1112, after the optical coupling isolation unit 1200 is turned on, the optical coupling isolation unit 1200 outputs a low level signal, and the second not gate 1310 outputs a high level signal after receiving the low level signal output by the optical coupling isolation unit 1200, that is, both the input and the output of the anti-static protection circuit 1000 are high level signals at this time; when the external accessory 2200 does not send data to the processor 2120, the first input end 1111 of the first not gate 1110 inputs a low level signal, the first output end 1112 outputs a high level signal, at this time, the optical coupling isolation unit 1200 is in an off state and outputs a high level signal, the second not gate 1310 receives the high level signal output by the optical coupling isolation unit 1200 and outputs a low level signal, that is, at this time, both the input and the output of the anti-static protection circuit 1000 are low level signals, thereby realizing that the input and the output signals of the anti-static protection circuit 1000 are the same, ensuring that the signal received by the processor 2120 connected with the anti-static protection circuit 1000 is the same as the signal sent by the external accessory 2200, and further ensuring that the processor 2120 receives a high quality signal.
As can be seen from the above, the anti-static protection circuit 1000 in this embodiment can also ensure that the signal received by the processor 2120 is the same as the signal sent by the external accessory 2200, thereby ensuring that the processor 2120 receives a high-quality signal.
Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of another embodiment of the anti-static protection circuit of the present application, and fig. 4 is a schematic structural diagram of the anti-static protection circuit in fig. 3 applied to a medical device. Unlike the above-described embodiment, the second anti-static protection unit 3300 includes the current limiting element 3330 in addition to the second not gate 3310.
The current limiting element 3330 is connected between the output terminal of the optocoupler isolation unit 3200 and the second input terminal 3311 of the second not gate 3310, and is configured to dissipate static electricity transmitted to the second anti-static protection unit 3300.
Specifically, in some application scenarios, the static electricity generated at the input terminal 3101 of the first anti-static protection unit 3100 may not flow all into the ground terminal 3140 through the conduction path of the voltage limiting element 3120, but may flow a small amount of static electricity into the back-end circuit, and at this time, the current limiting element 3330 may consume the static electricity flowing into the second anti-static protection unit 3300, so as to prevent the static electricity from entering the processor 4120 connected to the anti-static protection circuit 3000.
In an application scenario, the current limiting element 3330 comprises a first resistor 3331, and the first resistor 3331 is connected between the output terminal of the optocoupler isolation unit 3200 and the second input terminal 3311 of the second not gate 3310. In other application scenarios, the current limiting element 3330 may include a plurality of resistors connected in series.
Generally, the matching resistance of the input/output port of the processor 4120 is about 47 ohms, and in order to enable the first resistor 3331 to dissipate the static electricity transmitted to the second anti-static protection unit 3300, the resistance value of the first resistor 3331 is set to be two orders of magnitude larger than the matching resistance of the input/output port of the processor 4120, and in an application scenario, the resistance value of the first resistor 3331 is set to be 1 kilo-ohm to 4.7 kilo-ohms, for example, the resistance value of the first resistor 3331 is 1 kilo-ohm, 2 kilo-ohms, or 4.7 kilo-ohms.
In the present embodiment, the light coupling and isolating unit 3200 includes: a light emitting element 3210, a second resistor 3220, a photo coupler switch 3230, and a third resistor 3240.
The light emitting element 3210 and the second resistor 3220 are connected in series between the first power source 3130 and the first output terminal 3112 of the first not gate 3110; the optocoupler switch 3230 and the third resistor 3240 are connected in series between the second power supply 3320 and the ground 3140, wherein a connection node between the optocoupler switch 3230 and the third resistor 3240 is connected to the second input terminal 3311 of the second not gate 3310, and in the present embodiment, since the first resistor 3331 is provided, a connection node between the optocoupler switch 3230 and the third resistor 3240 and one end of the first resistor 3331, which is not connected to the second not gate 3310, are connected.
The light emitting element 3210 and the optocoupler switch 3230 form an optocoupler, which is a device that transmits an electrical signal through light as a medium, and has a strong anti-interference capability, so that the processor 4120 can isolate the communication signal and the electricity of the external accessory 4200.
Specifically, when the first not gate 3110 outputs a high level signal, the light emitting element 3210 does not emit light to turn off the optocoupler switch 3230, and at this time, the signal input from the second input terminal 3311 of the second not gate 3310 is a high level signal; when the first not gate 3110 outputs a low level signal, the light emitting element 3210 emits light to turn on the optical coupler switch 3230, so that the signal inputted from the second input terminal 3311 of the second not gate 3310 changes from a high level signal to a low level signal.
In an application scenario, since the optical coupling isolation unit 3200 has a level conversion function, the voltage values of the first power source 3130 and the second power source 3320 may be set to be different, for example, the voltage value of the first power source 3130 is set to be 5V, and the voltage value of the second power source 3320 is set to be 3.3V. By setting the voltage values of the first power source 3130 and the second power source 3320 to be different, the mismatch between the operating voltage of the external accessory 4200 and the operating voltage of the monitor 4200 can be avoided.
Of course, in other application scenarios, the voltage values of the first power source 3130 and the second power source 3320 may also be set to be the same, and are not limited herein.
In the present embodiment, the voltage limiting element 3120 includes a transient suppression diode 3121. The transient suppression diode 3121 is connected between the first input terminal 3111 of the first not gate 3110 and the ground terminal 3140.
The transient suppression diode 3121 is a high-efficiency protection device in the form of a diode, which is abbreviated as TVS tube. When the two poles of the transient suppressor 3121 are impacted by high energy of reverse transient, the high impedance between the two poles changes to low impedance, absorbing the surge power of thousands of watts, clamping the voltage between the two poles at a predetermined value, and effectively protecting the precise components in the electronic circuit. That is, when the input terminal 3101 of the first anti-static protection unit 3100 does not generate static electricity and operates normally, the transient suppression diode 3121 is in a high-impedance state, and does not affect the anti-static protection unit 3000 to normally receive data transmitted by the external accessory 4200; when static electricity is generated and the voltage at the input terminal 3101 of the first anti-static protection unit 3100 reaches the breakdown voltage of the transient suppression diode 3121, the transient suppression diode 3121 is turned on to introduce the static electricity to the ground 3140, and clamp the abnormal voltage within a safe level, thereby protecting the circuit.
In this embodiment, in order to ensure that a stable low signal is input to the first input terminal 3111 of the first not gate 3110 and a stable high signal is input to the second input terminal 3311 of the second not gate 3310 when the external accessory 4200 does not transmit data, the first anti-static protection unit 3100 further includes a fourth resistor 3150, and the fourth resistor 3150 is connected between the first input terminal 3111 of the first not gate 3110 and the ground terminal 3140. The second anti-static protection unit 3300 further includes a fifth resistor 3340, and the fifth resistor 3340 is connected between the second input terminal 3311 of the second not gate 3310 and the second power supply 3320.
In other embodiments, the fourth resistor 3150 and the fifth resistor 3340 may not exist at the same time, and only one of them may exist, which is not limited herein.
In this embodiment, in order to ensure that the processor 4120 can accurately recognize the signal output by the esd protection circuit 3000 and the processor 4120 receives a high-quality signal, the low level output by the second output terminal 3312 of the second not gate 3310 is less than the low level threshold of the input/output port of the processor 4120, and the high level output by the second output terminal 3312 of the second not gate 3310 is greater than the high level threshold of the input/output port of the processor 4120, so that the processor 4120 can be ensured to recognize the signal output by the second not gate 3310 as a high level signal or a low level signal, thereby avoiding the occurrence of an error in the signal recognized by the processor 4120 due to the fact that the level output by the second output terminal 3312 of the second not gate 3310 is close to the level threshold of the input/output port of the processor 4120.
In this embodiment, in order to ensure that the second not gate 3310 can recognize more signals, the low level input to the second input terminal 3311 of the second not gate 3310 is greater than the low level threshold of the input/output port of the processor 4120; and the high level input to the second input terminal 3311 of the second not gate 3310 is less than the high level threshold of the input/output port of the processor 4120.
In order to better understand the esd protection circuit in this embodiment, the operation principle of the esd protection circuit 3000 will be described in detail with reference to fig. 3 and 4 again.
When the input terminal 3101 of the first anti-static protection unit 3100 does not generate static electricity, the transient suppression diode 3121 is in an off state; when the input terminal 3101 of the first esd protection unit 3100 generates static electricity, the transient suppressor diode 3121 is turned on to discharge the static electricity, and the first resistor 3331 dissipates the static electricity transferred to the second esd protection unit 3300.
When the external accessory 4200 does not transmit data to the processor 4120, the first input terminal 3111 of the first not gate 3110 is in a stable low state, and thus the first output terminal 3112 is in a stable high state, the optical coupling isolation unit 3200 is in a cut-off state, and thus the second input terminal 3311 of the second not gate 3310 is in a stable high state, because the second output terminal 3312 is in a stable low state, and at this time, the input and the output of the esd protection circuit 2000 are in a stable low state, and thus the input/output port of the processor 4120 is also in a low state.
When the external accessory 4200 transmits data to the processor 4120, the first input terminal 3111 of the first not gate 3110 is in a high state, the second output terminal 3112 is in a low state, and the light emitting element 3210 emits light to turn on the optocoupler switch 3230, at this time, due to the voltage division of the first resistor 3331 and the fifth resistor 3340, the second input terminal 3311 of the second not gate 3310 is in a low state, so that the second output terminal 3312 outputs a high level, and at this time, the input and the output of the anti-static protection circuit 3000 are both in a high state, so that the input/output port of the processor 4120 is also in a high state.
In an application scenario, the voltage value of the first power source 3130 is 5V, the voltage value of the second power source 3320 is 3.3V, the resistance value of the first resistor 3331 ranges from 1 kilo-ohm to 4.7 kilo-ohm, the low level threshold of the input/output port of the processor 4120 is 0.8V, the high level threshold is 2.0V, after the optocoupler switch 3230 is turned on, due to the voltage division of the first resistor 3331 and the fifth resistor 3340, the voltage value input to the second input terminal 3311 of the second not gate 3310 approaches or exceeds 0.8V, at this time, if the second not gate 3310 is not set, the processor 4120 may generate an error of the identification signal, so that the second not gate 3310 is set, and the low level output from the second output terminal 3312 of the second not gate 3310 is set to be less than the low level threshold of the input/output port of the processor 4120, and the high level output is greater than the high level threshold of the input/output port of the processor 4120, which can ensure that the input/output level of the anti-static electricity protection circuit 3000 and the, it is also ensured that the high-low level signal outputted from the anti-static protection circuit 3000 can be recognized by the processor 4120, and finally that the processor 4120 receives a high quality signal.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the monitor of the present application. In this embodiment, the monitor 5000 includes an interface 5100, a processor 5200, and an electrostatic protection circuit 5300.
The interface 5100 is used for connecting with an external accessory, for example, a body temperature, blood pressure or blood oxygen measuring instrument, the processor 5200 is used for receiving and processing data sent by the external accessory, the anti-static protection circuit 5300 is connected between the interface 5100 and the processor 5200, and the anti-static protection circuit 5300 has the same structure as that of the anti-static protection circuit in any of the above embodiments, and specific structures thereof can be referred to the above embodiments and will not be described herein again.
In summary, be different from the condition in the prior art, the anti-static protection circuit of this application can guarantee to eliminate static through setting up the two-stage anti-static protection unit on the one hand, and on the other hand can realize signal isolation and electrical isolation between external annex and the monitor through setting up opto-coupler isolation unit, avoids both mutual influence, finally guarantees that the treater receives the high-quality signal that external annex sent.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. An anti-static protection circuit, comprising:
the input end of the first anti-static protection unit is used for connecting external accessories;
an optical coupling isolation unit;
the output end of the second anti-static protection unit is used for being connected with the processor;
the first anti-static protection unit and the second anti-static protection unit are connected through the optical coupling isolation unit;
the first anti-static protection unit includes:
and the voltage limiting element is connected between the input end of the first anti-static protection unit and the ground end so as to be conducted when the input end of the first anti-static protection unit generates static electricity and lead the static electricity to the ground end.
2. The electrostatic protection circuit according to claim 1, wherein the first electrostatic protection unit includes: a first not gate including a first input terminal and a first output terminal, wherein the first output terminal is used as an input terminal of the first anti-static protection unit to connect the external accessory; the second output end is connected with the input end of the optical coupling isolation unit;
the second anti-static protection unit includes: the second NOT gate comprises a second input end and a second output end, wherein the second input end is connected with the output end of the optical coupling isolation unit; the second output end is used as the output end of the second anti-static protection unit to be connected with the processor.
3. The anti-static protection circuit according to claim 2, wherein the low level output by the second output terminal is less than a low level threshold of the input/output port of the processor; and the high level output by the second output end is larger than the high level threshold value of the input/output port of the processor.
4. The anti-static protection circuit according to claim 3, wherein the low level of the second input terminal input is greater than a low level threshold of the input/output port of the processor; and the high level of the second input end input is less than the high level threshold of the input/output port of the processor.
5. The anti-static protection circuit according to claim 2, wherein the second anti-static protection unit further comprises:
and the current limiting element is connected between the output end of the optical coupling isolation unit and the second input end and is used for consuming static electricity transmitted into the second anti-static protection unit.
6. The anti-static protection circuit according to claim 5, wherein the current limiting element comprises:
and the first resistor is connected between the output end of the optical coupling isolation unit and the second input end.
7. The anti-static protection circuit according to claim 2, wherein the optical coupling isolation unit comprises:
a light emitting element and a second resistor connected in series between a first power source connected to the first not gate and the first output terminal;
the optocoupler switch and the third resistor are connected in series between a second power supply and a ground end, wherein the second power supply is connected with the second NOT gate, a connection node of the optocoupler switch and the third resistor is connected with the second input end, and the voltage value of the first power supply is different from that of the second power supply.
8. The anti-static protection circuit according to claim 2,
the first anti-static protection unit further includes: a fourth resistor connected between the first input terminal and ground, or,
the second anti-static protection unit further includes: and a fifth resistor connected between the second input terminal and a power supply connected to the second not gate.
9. The anti-static protection circuit according to claim 2, wherein the voltage limiting element comprises:
a transient suppression diode connected between the first input terminal and ground.
10. A monitor comprising an interface for connecting an external accessory, a processor for processing data transmitted from the external accessory, and the anti-static protection circuit as claimed in any one of claims 1 to 9 connected between the interface and the processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921782154.5U CN210744733U (en) | 2019-10-22 | 2019-10-22 | Anti-static protection circuit and monitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921782154.5U CN210744733U (en) | 2019-10-22 | 2019-10-22 | Anti-static protection circuit and monitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114222215A (en) * | 2021-12-01 | 2022-03-22 | 北京百度网讯科技有限公司 | Anti-static microphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114222215A (en) * | 2021-12-01 | 2022-03-22 | 北京百度网讯科技有限公司 | Anti-static microphone |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |