CN220628887U - Isolation protection circuit and display device with same - Google Patents
Isolation protection circuit and display device with same Download PDFInfo
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- CN220628887U CN220628887U CN202322145792.9U CN202322145792U CN220628887U CN 220628887 U CN220628887 U CN 220628887U CN 202322145792 U CN202322145792 U CN 202322145792U CN 220628887 U CN220628887 U CN 220628887U
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- isolation protection
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- 238000002955 isolation Methods 0.000 title claims abstract description 55
- 230000003071 parasitic effect Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 7
- 230000002457 bidirectional effect Effects 0.000 abstract description 10
- 238000003780 insertion Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
The utility model discloses an isolation protection circuit and display equipment with the same, wherein the isolation protection circuit comprises a first switching tube and a second switching tube, the control ends of the first switching tube and the second switching tube are respectively connected with a first power supply voltage end and a second power supply voltage end, the input ends of the first switching tube and the second switching tube are respectively connected with a first interface and a second interface, a first resistor is connected between the control end and the input end of the first switching tube, a third resistor is connected between the control end and the input end of the second switching tube, and the output ends of the first switching tube and the second switching tube are connected. The control end and the input end are respectively connected with the corresponding power supply voltage end and the corresponding interface through the first switching tube and the second switching tube, the corresponding resistor is respectively connected between the control end and the input end of the first switching tube and the second switching tube, and the output ends of the first switching tube and the second switching tube are connected, so that two interfaces of the circuit are symmetrical, bidirectional blind insertion is realized, and bidirectional isolation is realized by utilizing the on-off isolation interface of the switching tube.
Description
Technical Field
The present utility model relates to the field of electronic circuits, and more particularly, to an isolation protection circuit and a display device having the same.
Background
In the existing electronic products, such as displays, the communication signal interfaces between the boards are easy to have level differences, high levels are easy to influence low-level boards, such as the pull-up levels of serial communication interfaces are usually 5V and 3.3V, when the serial communication interfaces are in butt joint, the pull-up levels are easy to influence each other, so that the system is unstable, and when a terminal product is in electric heating plug, the ground pins of pin needles cannot be ensured to be contacted firstly in the plug moment, so that the communication ports are easy to be damaged due to the fact that the high voltage is generated between the communication ports due to the fact that the pin pins are not grounded together, and the MCU and the CPU chip are damaged.
Therefore, the communication interface needs to be isolated and protected, and the isolation and protection design of the current common circuit comprises resistor voltage division isolation, relay isolation and special chip isolation, wherein the circuit isolation and protection are carried out in a resistor voltage division isolation mode, the protection capability is limited, only unidirectional protection is realized, and the reliability is poor; the circuit isolation protection is carried out by adopting a relay isolation mode, namely, the level isolation and control are mainly realized by controlling the relay to be opened and closed in a triode mode, only unidirectional current and voltage control can be carried out, and the relay has large volume and higher cost; the circuit protection isolation is carried out by adopting a special chip isolation mode, and the cost is high.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an isolation protection circuit and display equipment with simple structures, so that bidirectional isolation protection is realized, a special chip is not needed, and the cost is low.
In a first aspect, the utility model provides an isolation protection circuit, which comprises a first switching tube and a second switching tube, wherein a control end of the first switching tube and a control end of the second switching tube are respectively connected with a first power supply voltage end and a second power supply voltage end, an input end of the first switching tube and an input end of the second switching tube are respectively connected with a first interface and a second interface, a first resistor is electrically connected between the control end and the input end of the first switching tube, a third resistor is electrically connected between the control end and the input end of the second switching tube, and an output end of the first switching tube is connected with an output end of the second switching tube.
The further technical scheme is as follows: the first switching tube and the second switching tube are NMOS tubes.
The further technical scheme is as follows: the grid electrode of the first switching tube and the grid electrode of the second switching tube are respectively connected with the first power supply voltage end and the second power supply voltage end, the source electrode of the first switching tube and the source electrode of the second switching tube are respectively connected with the first interface and the second interface, the grid electrode of the first switching tube and the source electrode of the first switching tube are respectively connected with two ends of the first resistor, the grid electrode of the second switching tube and the source electrode of the second switching tube are respectively connected with two ends of the third resistor, and the drain electrode of the first switching tube is connected with the drain electrode of the second switching tube.
The further technical scheme is as follows: the anode of the parasitic diode of the first switching tube is connected with the source electrode of the first switching tube, and the cathode of the parasitic diode of the first switching tube is connected with the drain electrode of the first switching tube; the anode of the parasitic diode of the second switching tube is connected with the source electrode of the second switching tube, and the cathode of the parasitic diode of the second switching tube is connected with the drain electrode of the second switching tube.
The further technical scheme is as follows: the first interface and the second interface are both I/O interfaces.
In a second aspect, the present utility model provides a display device including the above isolation protection circuit.
The further technical scheme is as follows: the display device further comprises a base, a connecting rod and a display screen, wherein the connecting rod is vertically arranged on the base, and the suspended end of the connecting rod is connected with the display screen.
The further technical scheme is as follows: the inside of base is equipped with the battery, keep apart protection circuit with the battery electricity is connected.
The further technical scheme is as follows: the display screen is internally provided with a control main board, and the isolation protection circuit is arranged on the control main board.
The further technical scheme is as follows: the bottom of base is equipped with removes the wheel, the back of display screen is equipped with the bracing piece, the suspension end of connecting rod with the bracing piece is connected, the connecting rod is the telescopic rod body.
The beneficial technical effects of the utility model are as follows: the isolation protection circuit of the utility model is characterized in that the control end and the input end of the isolation protection circuit are respectively connected with the corresponding power supply voltage end and the corresponding interface, the control end and the input end of the first switch tube and the second switch tube are respectively connected with the two ends of the corresponding resistor, and the output ends of the first switch tube and the second switch tube are connected, so that the two switch tubes are in mirror symmetry, the first interface and the second interface of the isolation protection circuit are symmetrical, thereby realizing that the isolation protection circuit can meet the requirement of bidirectional blind insertion, and the corresponding interfaces can be isolated by utilizing the on-off of the switch tubes, thereby realizing bidirectional isolation protection, effectively isolating external impact surge, simultaneously avoiding the problem of voltage crosstalk caused by the mismatch of the levels of the two interfaces. The display device of the present utility model also has the above-described functions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of an isolation protection circuit according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the 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.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of an isolation protection circuit provided by the embodiment of the utility model, the isolation protection circuit includes a first switch tube Q1 and a second switch tube Q2, a control end of the first switch tube Q1 is connected with a first power supply voltage end vcc_1, a control end of the second switch tube Q2 is connected with a second power supply voltage end vcc_2, an input end of the first switch tube Q1 is connected with a first interface I/O port a, an input end of the second switch tube Q2 is connected with a second interface I/O port b, a first resistor R1 is electrically connected between the control end and the input end of the first switch tube Q1, a third resistor R3 is electrically connected between the control end and the input end of the second switch tube Q2, an output end of the first switch tube Q1 is connected with an output end of the second switch tube Q2, wherein the first power supply voltage end vcc_1 is an upper power supply voltage end of the first interface I/O port a, the second power supply voltage end vcc_1 is a power supply voltage end of the second interface I/O port a power supply end of the second switch tube q_o port a power supply signal is connected with an external power supply device, and the external power supply device is connected between the second interface I/O port a power supply device and the external device.
The isolation protection circuit is characterized in that a control end and an input end are respectively connected with a corresponding power supply voltage end and a corresponding interface through a first switch tube Q1 and a second switch tube Q2, the control end and the input end of the first switch tube Q1 and the control end and the input end of the second switch tube Q2 are respectively connected with two ends of a corresponding resistor, the output ends of the first switch tube Q1 and the second switch tube Q2 are connected, the two switch tubes are in mirror symmetry, the first interface I/O PORTA and the second interface I/O PORTB of the isolation protection circuit are symmetrical, so that the isolation protection circuit can meet the requirement of bidirectional blind insertion, the corresponding interface can be isolated by utilizing the on-off of the switch tube, bidirectional isolation protection can be realized, external impact surge can be effectively isolated, meanwhile, the problem of voltage crosstalk caused by mismatch of the two interface levels can be avoided, the isolation protection circuit is simple in structure, isolation is realized without using a special chip, and the cost is low.
Specifically, in this embodiment, the first interface I/O port a and the second interface I/O port b are both I/O interfaces.
Specifically, in this embodiment, the first switching tube Q1 and the second switching tube Q2 are both NMOS tubes.
Specifically, in this embodiment, the gate of the first switching tube Q1 is connected to the first supply voltage terminal vcc_1, the gate of the second switching tube Q2 is connected to the second supply voltage terminal vcc_2, the source of the first switching tube Q1 is connected to the first interface I/O port a, the source of the second switching tube Q2 is connected to the second interface I/O port b, the gate and the source of the first switching tube Q1 are respectively connected to two ends of the first resistor R1, so that two ends of the first resistor R1 are respectively connected to the first supply voltage terminal vcc_1 and the first interface I/O port a, and then one end of the first resistor R1 is electrically connected between the first interface I/O port a and the input terminal of the first switching tube Q1, and the other end of the first resistor R1 is electrically connected between the first supply voltage terminal vcc_1 and the control terminal of the first switching tube Q1; the grid electrode and the source electrode of the second switching tube Q2 are respectively connected with two ends of the third resistor R3, so that two ends of the third resistor R3 are respectively connected with the second power supply voltage end VCC_2 and the second interface I/O PORTB, one end of the third resistor R3 is electrically connected between the second interface I/O PORTB and the input end of the second switching tube Q2, and the other end of the third resistor R3 is electrically connected between the second power supply voltage end VCC_2 and the control end of the second switching tube Q2; the drain electrode of the first switching tube Q1 is connected with the drain electrode of the second switching tube Q2.
Specifically, in this embodiment, an anode of the parasitic diode of the first switching tube Q1 is connected to the source of the first switching tube Q1, and a cathode of the parasitic diode of the first switching tube Q1 is connected to the drain of the first switching tube Q1; the anode of the parasitic diode of the second switching tube Q2 is connected with the source electrode of the second switching tube Q2, and the cathode of the parasitic diode of the second switching tube Q2 is connected with the drain electrode of the second switching tube Q2.
When the first interface I/O port a communicates to the second interface I/O port b, the level of the first interface I/O port a is pulled down, a level difference exists between the control end and the input end of the first switching tube Q1, that is, a level difference exists between the gate and the source of the first switching tube Q1, the first switching tube Q1 is turned on, so that the level between the first switching tube Q1 and the second switching tube Q2 is pulled down, and the level of the second interface I/O port b is also pulled down according to the parasitic diode of the second switching tube Q2. When the high level is needed, the level of the first interface I/O PORTA is pulled up, the first switching tube Q1 is turned off, the second interface I/O PORTB is pulled up to be high by the pulled-up level, and the first interface I/O PORTA can normally communicate and transfer to the second interface I/O PORTB in a reciprocating mode. When the second interface I/O port b communicates to the first interface I/O port a, the principle is similar, that is, the level of the second interface I/O port b is pulled down, there is a level difference between the control end and the input end of the second switching tube Q2, that is, there is a level difference between the gate and the source of the second switching tube Q2, the second switching tube Q2 is turned on, so that the level between the second switching tube Q2 and the first switching tube Q1 is pulled down, and the level of the first interface I/O port a is also pulled down according to the parasitic diode of the first switching tube Q1. When the high level is needed, the level of the second interface I/O PORTB is pulled up, the second switching tube Q2 is turned off, the first interface I/O PORTA is pulled up to be high by the pulled-up level, and the second interface I/O PORTB can normally communicate and transmit to the first interface I/O PORTA in a reciprocating mode. The isolation protection circuit can realize two-way communication.
The first interface I/O PORTA can be connected with the signal pin of MCU, the second interface I/O PORTB can be connected with the signal interface of external equipment, when abnormal impulse electricity high voltage appears, the level of the second power supply voltage end VCC_2 is far smaller than the impulse electricity high voltage, the second switch tube Q2 is turned off, the impulse electricity high voltage can not be conducted to the second interface I/O PORTB through the second switch tube Q2, and the impulse electricity isolation protection effect is realized.
Referring to fig. 2, fig. 2 shows a schematic structural diagram of a display device according to an embodiment of the present utility model, where the display device includes the isolation protection circuit, so that a level difference existing between boards of the display device can be isolated bidirectionally by using on/off of a first switching tube and a second switching tube, and bidirectional isolation protection is implemented for an internal circuit of the display device, so that stability of the display device is improved.
Specifically, the display device further comprises a base 11, a connecting rod 12 and a display screen 13, wherein the connecting rod 12 is vertically arranged on the base 11, and a suspended end of the connecting rod 12 is connected with the display screen 13 so that the display screen 13 is installed on the base 11 through the connecting rod 12.
Specifically, a battery is disposed inside the base 11, and the isolation protection circuit is electrically connected to the battery. Preferably, a control main board is disposed inside the display screen 13, and the isolation protection circuit is disposed on the control main board.
Specifically, the bottom of base 11 is equipped with the removal wheel, the back of display screen 13 is equipped with bracing piece 14, the suspended end of connecting rod 12 with bracing piece 14 is connected, connecting rod 12 is the telescopic link body, through connecting rod 12 height-adjustable display screen 13.
In summary, the isolation protection circuit of the utility model sets the control end and the input end of the first switch tube and the second switch tube respectively connected with the corresponding power supply voltage end and the corresponding interface, the control end and the input end of the first switch tube and the second switch tube are respectively connected with the two ends of the corresponding resistor, and the output ends of the first switch tube and the second switch tube are connected, so that the two switch tubes are mirror symmetry, the first interface and the second interface of the isolation protection circuit are symmetrical, thereby realizing that the isolation protection circuit can meet the requirement of bidirectional blind insertion, and the corresponding interfaces can be isolated by utilizing the on-off of the switch tubes, thereby realizing bidirectional isolation protection, effectively isolating external surge, simultaneously avoiding the problem of voltage crosstalk caused by the mismatch of the levels of the two interfaces. The display device of the present utility model also has the above-described functions.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. The utility model provides an isolation protection circuit, its characterized in that includes first switch tube and second switch tube, the control end of first switch tube with the control end of second switch tube links to each other with first power supply voltage end and second power supply voltage end respectively, the input of first switch tube with the input of second switch tube links to each other with first interface and second interface respectively, the electricity is connected with a first resistance between the control end of first switch tube and the input, the electricity is connected with a third resistance between the control end of second switch tube and the input, the output of first switch tube with the output of second switch tube links to each other.
2. The isolation protection circuit of claim 1, wherein the first and second switching transistors are NMOS transistors.
3. The isolation protection circuit of claim 2, wherein the gate of the first switching tube and the gate of the second switching tube are respectively connected to the first supply voltage terminal and the second supply voltage terminal, the source of the first switching tube and the source of the second switching tube are respectively connected to the first interface and the second interface, the gate and the source of the first switching tube are respectively connected to two ends of the first resistor, the gate and the source of the second switching tube are respectively connected to two ends of the third resistor, and the drain of the first switching tube is connected to the drain of the second switching tube.
4. The isolation protection circuit of claim 2, wherein an anode of the parasitic diode of the first switching tube is connected to a source of the first switching tube, and a cathode of the parasitic diode of the first switching tube is connected to a drain of the first switching tube; the anode of the parasitic diode of the second switching tube is connected with the source electrode of the second switching tube, and the cathode of the parasitic diode of the second switching tube is connected with the drain electrode of the second switching tube.
5. The isolation protection circuit of claim 1, wherein the first interface and the second interface are both I/O interfaces.
6. A display device comprising the isolation protection circuit of any one of claims 1-5.
7. The display device of claim 6, further comprising a base, a connecting rod, and a display screen, wherein the connecting rod is vertically disposed on the base, and wherein a suspended end of the connecting rod is connected to the display screen.
8. The display device according to claim 7, wherein a battery is provided inside the chassis, and the isolation protection circuit is electrically connected to the battery.
9. The display device according to claim 8, wherein a control main board is provided inside the display screen, and the isolation protection circuit is provided on the control main board.
10. The display device according to claim 7, wherein a moving wheel is arranged at the bottom of the base, a supporting rod is arranged at the back of the display screen, a suspended end of the connecting rod is connected with the supporting rod, and the connecting rod is a telescopic rod body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322145792.9U CN220628887U (en) | 2023-08-10 | 2023-08-10 | Isolation protection circuit and display device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322145792.9U CN220628887U (en) | 2023-08-10 | 2023-08-10 | Isolation protection circuit and display device with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220628887U true CN220628887U (en) | 2024-03-19 |
Family
ID=90225293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322145792.9U Active CN220628887U (en) | 2023-08-10 | 2023-08-10 | Isolation protection circuit and display device with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220628887U (en) |
-
2023
- 2023-08-10 CN CN202322145792.9U patent/CN220628887U/en active Active
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