CN211577874U

CN211577874U - Capacitive screen conference all-in-one machine

Info

Publication number: CN211577874U
Application number: CN201920947888.8U
Authority: CN
Inventors: 周美贤; 岑祥庆; 陈永淮; 谢奇君
Original assignee: Guangzhou Touch Pie Electronic Technology Co ltd
Current assignee: Guangzhou Touch Technology Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-09-25
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a capacitive screen conference all-in-one machine, which comprises a conference liquid crystal screen, a driving mainboard, a controller, a touch detection circuit and a power module, wherein the controller is respectively connected with the driving mainboard, the touch detection circuit and the power module, and the conference liquid crystal screen is connected with the driving mainboard; the power module comprises a voltage input end, a first resistor, a second potentiometer, a first diode, a third resistor, a first triode, a fourth resistor, a second triode, a fifth resistor, a first capacitor, a second capacitor, a third triode, a sixth resistor, a third capacitor and a voltage output end, wherein one end of the voltage input end is connected with one end of the first resistor and a collector of the first triode respectively, the other end of the first resistor is connected with a fixed end of the second potentiometer, and a base of the first triode is connected with a sliding end of the second potentiometer and one end of the fourth resistor respectively. The utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher.

Description

Capacitive screen conference all-in-one machine

Technical Field

The utility model relates to a meeting all-in-one circuit field, in particular to electric capacity screen meeting all-in-one.

Background

With the popularization of conference technology, all-in-one conference machines with large sizes and small sizes have entered modern conference rooms. Mobile terminals such as mobile phones and tablets are connected with the same router through the all-in-one machine, and wireless screen projection control of the mobile terminals can be achieved by opening the client. Is a practical choice for modern meetings, reports, speeches and training.

The conference all-in-one machine continuously erupts from 2017, and is very enthusiastic in 18 years, the conference all-in-one machine integrates the requirements of enterprise conference demonstration, interactive communication, writing and marking, remote video and the like, the traditional conference mode is revolutionarily changed, and the digital business interactive conference is comprehensively realized. The conference all-in-one machine is simple and convenient to use, the conference efficiency is high, conference exhibition and result recording are achieved, and the use experience is greatly improved.

Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional all-in-one conference machine, and it can be seen from fig. 1 that the power supply portion of the conventional all-in-one conference machine has many components, a complex circuit structure, high hardware cost and inconvenient maintenance. In addition, because the power supply part of the traditional conference all-in-one machine lacks corresponding circuit protection functions, for example: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit structure comparatively simple, the cost is lower, the security and the higher electric capacity screen meeting all-in-one of reliability of convenient maintenance, circuit.

The utility model provides a technical scheme that its technical problem adopted is: the capacitive screen conference all-in-one machine is constructed and comprises a conference liquid crystal screen, a driving main board, a controller, a touch detection circuit and a power module, wherein the controller is respectively connected with the driving main board, the touch detection circuit and the power module;

the power supply module comprises a voltage input end, a first resistor, a second potentiometer, a first diode, a third resistor, a first triode, a fourth resistor, a second triode, a fifth resistor, a first capacitor, a second capacitor, a third triode, a sixth resistor, a third capacitor and a voltage output end, one end of the voltage input end is connected with one end of the first resistor and a collector electrode of the first triode respectively, the other end of the first resistor is connected with a fixed end of the second potentiometer, a base electrode of the first triode is connected with a sliding end of the second potentiometer and one end of the fourth resistor respectively, another fixed end of the second potentiometer is connected with an anode of the first diode, a cathode of the first diode is connected with one end of the third resistor and a base electrode of the second triode respectively, and a collector electrode of the second triode is connected with the other end of the fourth resistor and the base electrode of the third triode respectively, the emitter of the second triode is respectively connected with one end of the fifth resistor and the anode of the first capacitor, the collector of the third triode is respectively connected with the cathode of the first capacitor and one end of the sixth resistor, the emitter of the first triode is respectively connected with the anode of the second capacitor, the anode of the third capacitor and one end of the voltage output end, the cathode of the second capacitor is connected with the emitter of the third triode, the other end of the voltage input end is respectively connected with the other end of the third resistor, the other end of the fifth resistor, the other end of the sixth resistor, the cathode of the third capacitor and the other end of the voltage output end, and the type of the first diode is S-272T.

In the all-in-one machine of capacitive screen conference, power module still includes the fourth electric capacity, the one end of fourth electric capacity with the collecting electrode of second triode is connected, the other end of fourth electric capacity respectively with the other end of fourth resistance and the base of third triode are connected, the capacitance value of fourth electric capacity is 290 pF.

In the all-in-one machine for capacitive screen and conference, the power module further comprises a second diode, an anode of the second diode is respectively connected with an emitting electrode of the first triode, an anode of the second capacitor and an anode of the third capacitor, a cathode of the second diode is connected with one end of the voltage output end, and a model of the second diode is L-1822.

In the capacitive screen conference all-in-one machine of the present invention, the first triode is an NPN type triode.

In the capacitive screen conference all-in-one machine of the present invention, the second triode is an NPN type triode.

In the capacitive screen conference all-in-one machine, the third triode is a PNP type triode.

Implement the utility model discloses an electric capacity screen meeting all-in-one has following beneficial effect: the conference liquid crystal display is provided with a conference liquid crystal screen, a driving main board, a controller, a touch detection circuit and a power supply module; the power module includes the first resistance of voltage input end, the second potentiometre, first diode, the third resistance, first triode, the fourth resistance, the second triode, the fifth resistance, first electric capacity, the second electric capacity, the third triode, the sixth resistance, third electric capacity and voltage output end, this power module compares with the power supply part of traditional meeting all-in-one, the components and parts that its used are less, owing to saved some components and parts, can reduce the hardware cost like this, in addition, first diode is used for carrying out current-limiting protection, consequently the utility model discloses circuit structure is comparatively simple, the cost is lower, convenient maintenance, the security and the reliability of circuit are higher.

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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only 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 is a schematic circuit diagram of a power supply portion of a conventional integrated conference machine;

fig. 2 is a schematic structural diagram in an embodiment of the integrated capacitive screen conference machine of the present invention;

fig. 3 is a schematic circuit diagram of the power supply module in the embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses in the electric capacity screen meeting all-in-one, the schematic structure of this electric capacity screen meeting all-in-one is shown in figure 2. In fig. 2, the capacitive screen conference all-in-one machine comprises a conference liquid crystal screen 1, a driving main board 2, a controller 3, a touch detection circuit 4 and a power module 5, wherein the controller 3 is respectively connected with the driving main board 2, the touch detection circuit 4 and the power module 5, and the conference liquid crystal screen 1 is connected with the driving main board 2.

When a user touches the touch panel, the touch detection circuit 4 can form surface current and transmit the surface current to the controller 3, the controller 3 can convert the current signal into a coordinate signal, namely a positioning signal of a touch point of the user, the controller 3 converts the positioning signal into a communication signal and sends the communication signal to the driving mainboard 2 by a USB signal, and meanwhile, the control signal is sent to the driving mainboard 2 to control the driving mainboard 2 to execute corresponding action. And after the positioning signal and the control signal are processed by the driving main board 2, the positioning signal and the control signal are butted with the conference liquid crystal screen 1, the conference liquid crystal screen 1 is started, and the conference liquid crystal screen 1 displays the positioning signal and the control signal.

In this embodiment, the conference liquid crystal screen 1, the driving main board 2, the controller 3, and the touch detection circuit 4 are all implemented by using the structure in the prior art, and the working principle thereof is also the working principle in the prior art, which is not described here.

Fig. 3 is a schematic circuit diagram of a power module in this embodiment, in fig. 3, the power module 5 includes a voltage input terminal Vin, a first resistor R1, a second potentiometer RP2, a first diode D1, a third resistor R3, a first transistor Q1, a fourth resistor R4, a second transistor Q2, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a third transistor Q3, a sixth resistor R6, a third capacitor C3 and a voltage output terminal Vo, wherein one end of the voltage input terminal Vin is connected to one end of a first resistor R1 and a collector of the first transistor Q1, the other end of the first resistor R1 is connected to one fixed end of a second potentiometer RP2, a base of a first transistor Q1 is connected to a sliding end of a second potentiometer 2 and one end of a fourth resistor R4, a base of another diode RP2 is connected to a fixed end of the first resistor R1, and a base of a cathode 867 of the first diode R2 and a cathode 8658, the collector of the second triode Q2 is connected to the other end of the fourth resistor R3 and the base of the third triode Q3, the emitter of the second triode Q2 is connected to one end of the fifth resistor R5 and the anode of the first capacitor C1, the collector of the third triode Q3 is connected to the cathode of the first capacitor C1 and one end of the sixth resistor R6, the emitter of the first triode Q1 is connected to the anode of the second capacitor C2, the anode of the third capacitor C3 and one end of the voltage output Vo, the cathode of the second capacitor C2 is connected to the emitter of the third triode Q3, and the other end of the voltage input terminal Vin is connected to the other end of the third resistor R3, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the cathode of the third capacitor C3 and the other end of the voltage output terminal Vo.

Compared with the power supply part of the traditional conference all-in-one machine in fig. 1, the power supply module 5 has the advantages of fewer used components, simpler circuit structure and convenience in maintenance, and can reduce the hardware cost due to the fact that some components are saved. In addition, the first diode D1 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the first diode D1 is located is large, the current of the branch where the first diode D1 is located can be reduced by the first diode D1, so that the branch is kept in a normal working state, and the components in the circuit are not burnt out due to the large current, so that the safety and reliability of the circuit are high, and the technical effect better than that of the conventional technology is realized by fewer components.

It should be noted that in the present embodiment, the first diode D1 has a model number S-272T. Of course, in practical applications, the first diode D1 may also be another type of diode with similar functions.

The working principle of the power module 5 is as follows: the voltage input by the voltage input end Vin firstly passes through the first resistor R1 and then turns on the first triode Q1, and then passes through the second potentiometer RP2 and the first diode D1 and then turns on the second triode Q2, when the second triode Q2 is turned on, the base of the third triode Q3 is triggered to turn on the base, and then the conduction process of the triodes is completed, and after the first triode Q1, the second triode Q2 and the third triode Q3 are all turned on, the voltage of the output end of the whole circuit can be kept stable. And the distribution of the voltage can be changed by adjusting the position of the sliding end of the second potentiometer RP2, and finally the purpose of adjusting the voltage of the voltage output end Vo is achieved, so that the application range of the product is further improved, and the product can flexibly supply power to the controller 3.

In this embodiment, the first transistor Q1 is an NPN transistor, the second transistor Q2 is an NPN transistor, and the third transistor Q3 is a PNP transistor. Certainly, in practical applications, the first transistor Q1 and the second transistor Q2 may both be PNP transistors, and the third transistor Q3 may also be NPN transistors, but the circuit structure is also changed accordingly.

In this embodiment, the power module 5 includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the collector of the second transistor Q2, and the other end of the fourth capacitor C4 is connected to the other end of the fourth resistor R4 and the base of the third transistor Q3, respectively. The fourth capacitor C4 is a coupling capacitor for preventing interference between the second transistor Q2 and the third transistor Q3, so as to further enhance the safety and reliability of the circuit.

The effect of the coupling capacitor is: an ac signal is passed from a previous stage to a next stage. The coupling method is also a direct coupling and a transformer coupling method. The direct coupling efficiency is highest, the signal is not distorted, but the adjustment of the front and rear two-stage working points is complex and mutually involved. In order to prevent the working point of the next stage from being affected by the previous stage, the previous stage and the next stage need to be separated in terms of direct current, and meanwhile, the alternating current signal can be smoothly transmitted from the previous stage to the next stage. They can both transmit AC signals and cut off DC, so that the working points of the front and rear stages are not involved. However, the difference is that the phase of the signal is delayed a little when the signal is transmitted by a capacitor, and the high frequency component of the signal is lost a little when the signal is transmitted by a transformer. Generally, a capacitor is commonly used as a coupling element in small signal transmission, and a transformer is commonly used as a coupling element in large signal or strong signal transmission. The utility model discloses in adopt fourth electric capacity C4 as coupling element, can make the operating point of back one-level not receive the influence of preceding one-level like this, that is to say make second triode Q2's operating point not receive third triode Q3's influence. The fourth capacitor C4 is an inter-stage coupling capacitor, and functions to isolate the dc bias circuits of the front and rear stages of the third transistor Q3 and the second transistor Q2, so as to prevent the static operating points of the front and rear stages from affecting each other. The working principle of the method utilizes the working principle of interstage coupling electricity in the prior art, and the mastiff is not described herein.

It should be noted that, in the present embodiment, the capacitance value of the fourth capacitor C4 is 290 pF. Of course, in practical applications, the capacitance value of the fourth capacitor C4 may be adjusted accordingly, that is, the capacitance value of the fourth capacitor C4 may be increased or decreased accordingly.

In this embodiment, the power module 5 further includes a second diode D2, an anode of the second diode D2 is connected to an emitter of the first transistor Q1, an anode of the second capacitor C2, and an anode of the third capacitor C3, respectively, and a cathode of the second diode D2 is connected to one end of the voltage output terminal Vo. The second diode D2 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the second diode D2 is located is large, the current of the branch where the second diode D2 is located can be reduced by the second diode D2, so that the branch can be kept in a normal operating state, and the device in the circuit is not burned out due to the large current, so as to further enhance the safety and reliability of the circuit.

It should be noted that in the present embodiment, the second diode D2 has a model number L-1822. Of course, in practical applications, the second diode D2 may also be another type of diode with similar functions.

In a word, in this embodiment, this power module 5 compares with the power supply part of traditional meeting all-in-one, and its components and parts that use are less, and circuit structure is comparatively simple, and convenient maintenance owing to saved some components and parts, can reduce hardware cost like this. In addition, the power module 5 is provided with a current-limiting diode, so that the safety and the reliability of the circuit are high.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A capacitive screen conference all-in-one machine is characterized by comprising a conference liquid crystal screen, a driving main board, a controller, a touch detection circuit and a power module, wherein the controller is respectively connected with the driving main board, the touch detection circuit and the power module;

2. The capacitive screen conference all-in-one machine as claimed in claim 1, wherein the power module further comprises a fourth capacitor, one end of the fourth capacitor is connected with a collector of the second triode, the other end of the fourth capacitor is respectively connected with the other end of the fourth resistor and a base of the third triode, and a capacitance value of the fourth capacitor is 290 pF.

3. The capacitive screen conference all-in-one machine of claim 2, wherein the power module further comprises a second diode, an anode of the second diode is connected with an emitter of the first triode, an anode of the second capacitor and an anode of the third capacitor respectively, a cathode of the second diode is connected with one end of the voltage output end, and the type of the second diode is L-1822.

4. The capacitive screen conference all-in-one machine according to any one of claims 1 to 3, wherein the first triode is an NPN type triode.

5. The capacitive screen conference all-in-one machine according to any one of claims 1 to 3, wherein the second triode is an NPN triode.

6. The capacitive screen conference all-in-one machine of any one of claims 1 to 3, wherein the third triode is a PNP type triode.