CN209946825U

CN209946825U - Wireless touch all-in-one machine

Info

Publication number: CN209946825U
Application number: CN201920823631.1U
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-Pie Electronic Technology Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-01-14
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses a wireless touch all-in-one machine, which comprises a shell, a computer host and a touch display screen, wherein a main control panel is arranged in the computer host, a singlechip, a memory, a flash memory, a wireless communication module, an image acquisition module, a sound card, an audio module, a LED lamp group and a power module are arranged on the main control panel, and the memory, the flash memory, the wireless communication module, the image acquisition module, the sound card, the audio module and the LED lamp group are all connected with the singlechip; the power supply module comprises a voltage input end, first to seventh resistors, a first voltage stabilizing diode, a first capacitor, a second capacitor, a first MOS (metal oxide semiconductor) tube, a first triode, a second diode, a fifth diode, a first inductor, a fourth capacitor, a third capacitor, a first operational amplifier, a third diode, a fourth diode, an eighth resistor and a ninth resistor. 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

Wireless touch all-in-one machine

Technical Field

The utility model relates to a touch all-in-one circuit field, in particular to wireless touch all-in-one.

Background

The touch integrated machine integrates advanced touch screen, industrial control, computer and other technologies, can realize public information inquiry, and can realize specific requirements of fingerprint attendance checking, card swiping, printing and the like by being matched with peripherals such as a fingerprint instrument, a scanner, a card reader, a micro printer and the like.

The touch all-in-one machine is provided with a touch screen, a five-wire resistance screen, a surface acoustic wave screen, an infrared screen, a holographic nano touch film and other excellent touch screens at home and abroad, and can meet the application requirements of users in different regions and places. The touch integrated machine is a touch product which binds a touch screen and related software together and is matched with an outer package for inquiry purposes. The touch control all-in-one machine truly integrates touch and control, and greatly improves the working efficiency of people.

As an input device, the touch integrated machine adopts a touch screen which has the advantages of firmness, durability, high response speed, space saving, easy communication and the like. The user can quickly obtain the information wanted by the user by lightly touching the machine screen with fingers, so that the man-machine interaction is more straightforward. As a high-tech machine, the touch all-in-one machine gradually replaces the position of a pure touch screen, so that a user can really feel the characteristic that the human machine can freely interact.

Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional touch all-in-one machine, and as can be seen from fig. 1, the power supply portion of the conventional touch all-in-one machine has many components, a complex circuit structure, high hardware cost and inconvenient maintenance. In addition, because the power supply part of the traditional touch integrated 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, a circuit structure is comparatively simple, the cost is lower, the security and the higher wireless touch all-in-one of reliability of convenient maintenance, circuit is provided.

The utility model provides a technical scheme that its technical problem adopted is: the wireless touch all-in-one machine comprises a shell, a computer host and a touch display screen, wherein the touch display screen is arranged on one side face of the shell, the computer host is embedded in the shell, a main control board is arranged in the computer host, a single chip microcomputer, a memory, a flash memory, a wireless communication module, an image acquisition module, a sound card, an audio module, an LED lamp bank and a power module are arranged on the main control board, the touch display screen, the memory, the flash memory, the wireless communication module, the image acquisition module, the sound card, the audio module and the LED lamp bank are all connected with the single chip microcomputer, and the power module is connected with the LED lamp bank;

the power supply module comprises a voltage input end, a first resistor, a first voltage stabilizing diode, a first capacitor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor, a first MOS (metal oxide semiconductor) tube, a first triode, a second diode, a fifth diode, a first inductor, a fourth capacitor, a third capacitor, a sixth resistor, a seventh resistor, a first operational amplifier, a third diode, a fourth diode, an eighth resistor and a ninth resistor, wherein the voltage input end is respectively connected with one end of the first resistor, one end of the second resistor, one end of the fourth resistor and a drain electrode of the first MOS tube, the other end of the first resistor is respectively connected with an anode of the fifth diode, one end of the eighth resistor, a cathode of the first voltage stabilizing diode, one end of the first capacitor and a power supply cathode end of the first operational amplifier, an anode of the first voltage stabilizing diode and the other end of the first capacitor are both grounded, the other end of the second resistor is respectively connected with one end of a third resistor and the base electrode of a first triode, the other end of the third resistor, the emitting electrode of the first triode and the emitting electrode of the second triode are all grounded, the other end of the fourth resistor is respectively connected with one end of a fifth resistor and one end of a second capacitor, the other end of the fifth resistor is respectively connected with the collector electrode of the first triode, the collector electrode of the second triode and the grid electrode of a first MOS (metal oxide semiconductor) transistor, the base electrode of the second triode is respectively connected with one end of a third capacitor and one end of a sixth resistor, and the other end of the third capacitor is respectively connected with one end of a seventh resistor, the other end of the sixth resistor and the output end of a first operational amplifier;

the non-inverting input end of the first operational amplifier is respectively connected with the other end of the seventh resistor and one end of the ninth resistor, the inverting input end of the first operational amplifier is connected with the other end of the eighth resistor, the source electrode of the first MOS tube is respectively connected with the other end of the second capacitor, the cathode of the first diode and one end of the first inductor, the other end of the first inductor is respectively connected with one end of the fourth capacitor, the anode of the third diode, the other end of the ninth resistor and the LED lamp set, the cathode of the third diode is connected with the cathode of the fourth diode, the anode of the second diode, the other end of the fourth capacitor and the anode of the fourth diode are all grounded, and the cathode of the fifth diode is connected with the anode power supply end of the first operational amplifier, and the model of the fifth diode is S-562T.

In the wireless touch all-in-one machine, power module still includes fifth electric capacity, the one end of fifth electric capacity with the grid of first MOS pipe is connected, the other end of fifth electric capacity respectively with the collecting electrode of first triode and the collecting electrode of second triode are connected, the capacitance value of fifth electric capacity is 280 pF.

In the wireless touch integrated machine, the power module further includes a tenth resistor, one end of the tenth resistor is connected to the cathode of the first zener diode, the other end of the tenth resistor is connected to the cathode power supply of the first operational amplifier, and the resistance of the tenth resistor is 43k Ω.

In the wireless touch all-in-one machine, first MOS pipe is N channel MOS pipe, first triode and second triode are NPN type triode.

In the wireless touch integrated machine, the wireless communication module is a bluetooth module, a WiFi module, a GSM module, a GPRS module, a CDMA2000 module, a WCDMA module, a TD-SCDMA module, a Zigbee module or a LoRa module.

Implement the utility model discloses a wireless touch all-in-one has following beneficial effect: the intelligent touch screen is characterized in that the intelligent touch screen is provided with a shell, a computer host and a touch display screen, a main control board is arranged in the computer host, and a single chip microcomputer, a memory, a flash memory, a wireless communication module, an image acquisition module, a sound card, an audio module, an LED lamp set and a power module are arranged on the main control board; the power module includes voltage input end, first resistance, first zener diode, first electric capacity, the second resistance, the third resistance, the fourth resistance, the fifth resistance, the second electric capacity, first MOS pipe, first triode, the second diode, the fifth diode, first inductance, the fourth electric capacity, the third electric capacity, the sixth resistance, the seventh resistance, first operational amplifier, the third diode, the fourth diode, eighth resistance and ninth resistance, this power module compares with the power supply part of traditional touch all-in-one, its components and parts that use are less, owing to saved some components and parts, can reduce the hardware cost like this, in addition, the fifth diode is used for carrying out current-limiting protection, therefore 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 the power supply portion of the touch integrated machine;

fig. 2 is a schematic view illustrating a connection between a main control board and a touch display screen in an embodiment of the wireless touch integrated 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 embodiment of wireless touch all-in-one, this wireless touch all-in-one includes casing, computer and touch display screen 2, and touch display screen 2 sets up on a side of casing, and the computer inlays in the casing, and the computer embeds there is main control board 1. Fig. 2 is a schematic diagram of the connection between the main control panel and the touch display screen. In fig. 2, a single chip microcomputer 11, a memory 12, a flash memory 13, a wireless communication module 14, an image acquisition module 15, a sound card 16, an audio module 17, an LED lamp set 18 and a power module 19 are arranged on a main control panel 1, wherein the touch display screen 2, the memory 12, the flash memory 13, the wireless communication module 14, the image acquisition module 15, the sound card 16, the audio module 17 and the LED lamp set 18 are all connected with the single chip microcomputer 11, the power module 19 is connected with the LED lamp set 18, and a user supplies power to the LED lamp set 18. Colorful teaching contents can be displayed on the touch display screen 2, and meanwhile, the touch display screen has strong practicability.

In this embodiment, the wireless communication module 14 is a bluetooth module, a WiFi module, a GSM module, a GPRS module, a CDMA2000 module, a WCDMA module, a TD-SCDMA module, a Zigbee module, or a LoRa module. Through setting up multiple wireless communication mode, not only can increase wireless communication mode's flexibility, can also satisfy the demand of different users and different occasions. Especially, when adopting the loRa module, its communication distance is far away, and communication performance is comparatively stable, is applicable to the occasion that requires highly to communication quality.

Fig. 3 is a schematic circuit diagram of a power module in this embodiment, in fig. 3, the power module 19 includes a voltage input terminal Vin, a first resistor R1, a first zener diode D1, a first capacitor C1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a first MOS transistor M1, a first transistor Q1, a second transistor Q2, a second diode D2, a fifth diode D5, a first inductor L5, a fourth capacitor C5, a third capacitor C5, a sixth resistor R5, a seventh resistor R5, a first operational amplifier a 5, a third diode D5, a fourth diode D5, an eighth resistor R5, and a ninth resistor R5, where the voltage input terminal Vin is respectively connected to one end of the first resistor R5, one end of the second resistor R5, one end of the fourth resistor R5, and the other end of the first resistor R5, and the drain of the fifth resistor R5 are respectively connected to the anode of the first resistor R5, and the drain of the first resistor R, One end of an eighth resistor R8, a cathode of the first zener diode D1, one end of a first capacitor C1 and a power supply negative end of the first operational amplifier a1 are connected, an anode of the first zener diode D1 and the other end of the first capacitor C1 are both grounded, the other end of the second resistor R2 is connected to one end of the third resistor R3 and a base of the first transistor Q1, the other end of the third resistor R3, an emitter of the first transistor Q1 and an emitter of the second transistor Q2 are both grounded, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and one end of the second capacitor C2, the other end of the fifth resistor R5 is connected to a collector of the first transistor Q1, a collector of the second transistor Q2 and a gate of the first MOS transistor M1, a base of the second transistor Q2 is connected to one end of the third capacitor C2 and one end of the sixth resistor R6, and the other end of the third capacitor C8653 are connected to a base of the seventh resistor R3, The other end of the sixth resistor R6 is connected to the output terminal of the first operational amplifier a 1.

The non-inverting input end of the first operational amplifier a1 is connected to the other end of the seventh resistor R7 and one end of the ninth resistor R9, the inverting input end of the first operational amplifier a1 is connected to the other end of the eighth resistor R8, the source of the first MOS transistor M1 is connected to the other end of the second capacitor C2, the cathode of the first diode and one end of the first inductor L1, the other end of the first inductor L1 is connected to one end of the fourth capacitor C4, the anode of the third diode D3, the other end of the ninth resistor R9 and the LED lamp set, the cathode of the third diode D3 is connected to the cathode of the fourth diode D4, the anode of the second diode D2, the other end of the fourth capacitor C4 and the anode of the fourth diode D4 are all grounded, and the cathode of the fifth diode D5 is electrically connected to the anode of the first operational amplifier a 1.

Compared with the power supply part of the traditional touch all-in-one machine in fig. 1, the power supply module 19 has fewer used components, saves a voltage stabilizing diode D1, a resistor R7, a diode VD6, a diode VD7, a diode VD4, a diode VD3 and a resistor R2 in fig. 1, and can reduce hardware cost due to the fact that some components are saved. In addition, the fifth diode D5 is a current-limiting diode for current-limiting protection, and when the current of the branch in which the fifth diode D5 is located is large, the magnitude of the current of the branch in which the fifth diode D5 is located can be reduced by the fifth diode D5, so that the current can be kept in a normal operating state, and the components in the circuit cannot be burned out due to too large current. Therefore the utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher, and realize the better technological effect than the conventional art with components and parts still less. It should be noted that in the present embodiment, the model of the fifth diode D5 is S-562T, and certainly, in practical applications, other models of diodes with similar functions may be adopted as the fifth diode D5.

In this embodiment, the first operational amplifier a1 is of type LM 324.

The working principle of the power module 19 is as follows: the voltage input end Vin is direct current obtained by rectifying and reducing 220V alternating current commercial power. The first operational amplifier a1 oscillates with positive feedback, and the oscillation frequency is determined by the first inductor L1 and the seventh resistor R7. When the first MOS transistor M1 is turned off, the reverse voltage induced by the first inductor L1 is supplied from the output terminal to the LED lamp set 18 through the second diode D2, the output voltage is applied to the non-inverting input terminal of the first operational amplifier a1, and compared with the 5V reference voltage applied to the inverting input terminal thereof, the output of the first operational amplifier a1 controls the first MOS transistor M1 to be turned on or off through the second transistor Q2, and when the peak value of the output voltage exceeds 6V, the overvoltage detection circuit composed of the second transistor Q2 and other elements operates to reliably turn off the first MOS transistor M1, thereby turning off the LED lamp set 18. Third diode D3, fourth diode D4 and fourth electric capacity C4 are added to the one end of first inductance L1, can effectively clamp the first inductance L1 to safe value because of the spike voltage that the leakage inductance produced, improve the stability of circuit, and the steady voltage is effectual, especially adapted using widely.

In this embodiment, the first MOS transistor M1 is an N-channel MOS transistor, and the first transistor Q1 and the second transistor Q2 are both NPN transistors.

In this embodiment, the power module 19 further includes a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the gate of the first MOS transistor M1, and the other end of the fifth capacitor C5 is connected to the collector of the first transistor Q1 and the collector of the second transistor Q2, respectively. The fifth capacitor C5 is a coupling capacitor for preventing interference between the second transistor Q2 and the first MOS transistor M1, so as to further enhance the safety and reliability of the circuit.

Specifically, the coupling capacitance functions as: 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 fifth electric capacity C5 as coupling element, can make the operating point of back one-level not receive the influence of preceding one-level like this, also make the operating point of first MOS pipe M1 not receive the influence of second triode Q2 promptly. The fifth capacitor C5 is an inter-stage coupling capacitor, and functions to isolate the dc bias circuit between the second transistor Q2 and the front and rear stages of the first MOS transistor M1, so as to prevent the front and rear stage static operating points 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 of the fifth capacitor C5 is 280 pF. Of course, in practical applications, the capacitance value of the fifth capacitor C5 may be adjusted accordingly, that is, the capacitance value of the fifth capacitor C5 may be increased or decreased accordingly.

In this embodiment, the power module 19 further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to the cathode of the first zener diode D1, and the other end of the tenth resistor R10 is connected to the cathode power terminal of the first operational amplifier a 1. The tenth resistor R10 is a current limiting resistor for current limiting protection to further enhance the safety and reliability of the circuit. The principle of current limiting is as follows: when the current of the branch where the tenth resistor R10 is located is large, the magnitude of the current of the branch where the tenth resistor R10 is located can be reduced by the tenth resistor R10, so that the branch can be kept in a normal operating state, and the components in the circuit cannot be burned out due to too large current.

It should be noted that, in this embodiment, the resistance of the tenth resistor R10 is 43k Ω. Of course, in practical applications, the resistance of the tenth resistor R10 may be adjusted according to specific situations, that is, the resistance of the tenth resistor R10 may be increased or decreased according to specific situations.

In short, in this embodiment, compared with the power supply part of the conventional touch all-in-one machine, the power supply module 19 has fewer used components, simpler circuit structure and convenient maintenance, and can reduce the hardware cost due to the saving of some components. In addition, since the power supply module 19 is provided with a current limiting diode, the safety and 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 wireless touch all-in-one machine is characterized by comprising a shell, a computer host and a touch display screen, wherein the touch display screen is arranged on one side face of the shell, the computer host is embedded in the shell, a main control board is arranged in the computer host, a single chip microcomputer, a memory, a flash memory device, a wireless communication module, an image acquisition module, a sound card, an audio module, an LED lamp bank and a power module are arranged on the main control board, the touch display screen, the memory, the flash memory device, the wireless communication module, the image acquisition module, the sound card, the audio module and the LED lamp bank are all connected with the single chip microcomputer, and the power module is connected with the LED lamp bank;

2. The wireless touch all-in-one machine of claim 1, wherein the power module further comprises a fifth capacitor, one end of the fifth capacitor is connected to the gate of the first MOS transistor, the other end of the fifth capacitor is connected to the collector of the first triode and the collector of the second triode respectively, and the capacitance of the fifth capacitor is 280 pF.

3. The wireless touch integrated machine according to claim 2, wherein the power supply module further comprises a tenth resistor, one end of the tenth resistor is connected to the cathode of the first zener diode, the other end of the tenth resistor is connected to the cathode power supply end of the first operational amplifier, and the resistance value of the tenth resistor is 43k Ω.

4. The wireless touch all-in-one machine according to any one of claims 1 to 3, wherein the first MOS transistor is an N-channel MOS transistor, and the first triode and the second triode are both NPN type triodes.

5. The wireless touch integrated machine of any one of claims 1 to 3, wherein the wireless communication module is a Bluetooth module, a WiFi module, a GSM module, a GPRS module, a CDMA2000 module, a WCDMA module, a TD-SCDMA module, a Zigbee module or a LoRa module.