CN209823641U

CN209823641U - Teaching machine

Info

Publication number: CN209823641U
Application number: CN201920893255.3U
Authority: CN
Inventors: 邓明皓
Original assignee: Foshan Shunde Xunfa Network Communication Co Ltd
Current assignee: Foshan Shunde Xunfa Network Communication Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2019-12-20
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a teaching integrated machine, which comprises a network switch, an industrial computer, an operation panel, a main controller, an audio/video switching module, a digital power amplifier module and a power module, wherein the network switch is respectively connected with the industrial computer, the main controller and the audio/video switching module; the power module comprises a voltage input end, a rectifier bridge, a first diode, a first MOS (metal oxide semiconductor) tube, a first triode, a first resistor, a second resistor, a first capacitor and a voltage output end, wherein one end of the voltage input end is connected with one input end of the rectifier bridge, the other end of the voltage input end is connected with the other input end of the rectifier bridge, and one output end of the rectifier bridge is connected with the anode of the first diode. 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

Teaching machine

Technical Field

The utility model relates to a teaching equipment field, in particular to teaching all-in-one.

Background

The multimedia teaching all-in-one machine integrates infrared touch technology, intelligent office teaching software, multimedia network communication technology, high-definition panel display technology and other technologies, integrates a plurality of devices such as a projector, an electronic whiteboard, a computer, a television, a touch function and the like into a whole, and improves a traditional display terminal into a man-machine interaction device with comprehensive functions. Through the product, a user can realize writing, commenting, drawing, multimedia entertainment and computer operation, and can easily perform a wonderful interactive classroom by directly opening equipment.

Fig. 1 is a schematic circuit diagram of a power supply part of a conventional teaching all-in-one machine, and it can be seen from fig. 1 that the power supply part of the conventional teaching all-in-one machine uses many components and parts, has a complex circuit structure and high hardware cost, and is inconvenient to maintain. In addition, because the power supply part of the traditional teaching 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, a circuit structure is comparatively simple, the cost is lower, the security and the higher teaching all-in-one of reliability of convenient maintenance, circuit are provided.

The utility model provides a technical scheme that its technical problem adopted is: the teaching all-in-one machine is constructed and comprises a network switch, an industrial computer, an operation panel, a main controller, an audio and video switching module, a digital power amplifier module and a power supply module, wherein the network switch is respectively connected with the industrial computer, the main controller and the audio and video switching module;

the power module comprises a voltage input end, a rectifier bridge, a first diode, a first MOS (metal oxide semiconductor) tube, a first triode, a first resistor, a second resistor, a first capacitor and a voltage output end, wherein one end of the voltage input end is connected with one input end of the rectifier bridge, the other end of the voltage input end is connected with the other input end of the rectifier bridge, one output end of the rectifier bridge is connected with the anode of the first diode, the cathode of the first diode is connected with the drain electrode of the first MOS tube, the grid electrode of the first MOS tube is connected with the collector electrode of the first triode, the source electrode of the first MOS tube is respectively connected with one end of the first resistor, the anode of the first capacitor and one end of the voltage output end, the base electrode of the first triode is respectively connected with the other end of the first resistor and one end of the second resistor, and the other output end of the rectifier bridge is respectively connected with the emitter electrode of the first triode, The other end of the second resistor, the negative electrode of the first capacitor and the other end of the voltage output end are connected, and the model of the first diode is S-102T.

In the teaching all-in-one machine, power module still includes the second electric capacity, the second electric capacity with one end with the grid of first MOS pipe is connected, the other end of second electric capacity with the collecting electrode of first triode is connected, the capacitance value of second electric capacity is 290 pF.

Teaching all-in-one, power module still includes the third resistance, the one end of third resistance with the source electrode of first MOS pipe is connected, the other end of third resistance respectively with the one end of first resistance, the positive pole of first electric capacity and the one end of voltage output end are connected, the resistance of third resistance is 32k omega.

Teaching all-in-one in, first MOS pipe is N channel MOS pipe.

In the teaching machine of the present invention, the first triode is an NPN type triode.

Implement the utility model discloses a teaching all-in-one has following beneficial effect: the system is provided with a network switch, an industrial computer, an operation panel, a main controller, an audio and video switching module, a digital power amplifier module and a power supply module; the power module includes voltage input end, the rectifier bridge, first diode, first MOS pipe, first triode, first resistance, the second resistance, first electric capacity and voltage output end, this power module compares with the power supply part of traditional teaching 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, therefore 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 a conventional teaching kiosk;

fig. 2 is a schematic structural diagram in an embodiment of the teaching all-in-one 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 teaching all-in-one machine embodiment, this teaching all-in-one machine's schematic structure is shown in FIG. 2. In fig. 1, the teaching all-in-one machine comprises a network switch 1, an industrial computer 2, an operation panel 3, a main controller 4, an audio/video switching module 5, a digital power amplifier module 6 and a power module 7, wherein the network switch 1 is respectively connected with the industrial computer 2, the main controller 4 and the audio/video switching module 5, the power module 7 is connected with the main controller 4, the digital power amplifier module 6 is connected with the main controller 4, and the industrial computer 2 is connected with the operation panel 3.

The teaching all-in-one machine utilizes a TCP/IP network protocol to realize network data interaction, safely encrypts data in transmission and can convert the data into a base64 coding format for transmission. Specifically, the teaching all-in-one machine is connected with a cloud server through a network switch 1, and the operation and maintenance data of the internet of things all-in-one machine are uniformly managed through a big data platform, so that remote monitoring is realized; or the network switch 1 is connected with a background manager such as a computer, and the background manager manages all the teaching integrated machines in a unified way. The network switch 1 of the teaching all-in-one machine is convenient for realizing automatic fault maintenance, saving of running log information and statistical analysis of running conditions.

The industrial computer 2 can be an OPS micro industrial computer, is connected with the network switch 1 through an OPS (open plug connector configuration) interface, is convenient to install, use and maintain, enables the internal layout of the teaching all-in-one machine to be compact, and reduces the volume of the equipment without affecting the performance.

The main controller 4 can trigger the digital power amplifier module 6 to perform digital signal processing on the audio data, such as noise filtering, sound effect adjustment and the like. The digital power amplifier module 6 can optimize the audio signal, improve the output tone quality of the audio signal and the intelligent degree of the teaching all-in-one machine. The operation panel 3 may be a push-button operation panel, which is helpful to improve the recognition of the control signal and the transmission efficiency.

In this embodiment, the network switch 1 is a TENDA S105 switch, and the industrial computer 2 is 120OPS-QM9900 or OPS-M201.

In this embodiment, the network switch 1, the industrial computer 2, the operation panel 3, the main controller 4, the audio/video switching module 5, and the digital power amplifier module 6 are all implemented by using a 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 7 includes a voltage input terminal Vin, a rectifier bridge Z, a first diode D1, a first MOS transistor M1, a first transistor Q1, a first resistor R1, a second resistor R2, a first capacitor C1, and a voltage output terminal Vo, wherein one end of the voltage input terminal Vin is connected to one input terminal of the rectifier bridge Z, the other end of the voltage input terminal Vin is connected to the other input terminal of the rectifier bridge Z, one output terminal of the rectifier bridge Z is connected to an anode of a first diode D1, a cathode of the first diode D1 is connected to a drain of the first MOS transistor M1, a gate of the first MOS transistor M1 is connected to a collector of the first transistor Q1, a source of the first MOS transistor M1 is connected to one end of the first resistor R1, an anode of the first capacitor C1, and one end of the voltage output terminal Vo, a base of the first transistor Q1 is connected to the other end of the first resistor R1 and the second resistor R2, the other output end of the rectifier bridge Z is respectively connected with the emitter of the first triode Q1, the other end of the second resistor R2, the cathode of the first capacitor C1 and the other end of the voltage output end Vo.

Compared with the power supply part of the traditional teaching all-in-one machine, the power supply module 7 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 of the drain current of the first MOS transistor M1. The current limiting protection principle is as follows: when the drain current of the first MOS transistor M1 is large, the first diode D1 can reduce the drain current of the first MOS transistor M1 to keep the first MOS transistor M1 in a normal operating state, so that the device in the circuit is not burned out due to too large current, the safety and reliability of the circuit are high, and the technical effect better than that of the conventional technology is achieved by fewer devices.

It should be noted that in the present embodiment, the first diode D1 is of type S-102T. Of course, in practical applications, the first diode D1 may also be another type of diode with similar functions.

When the voltage between the drain and the source of the first MOS transistor M1 reaches a predetermined value, for example, the predetermined value is 10V, the drain and the source of the first MOS transistor M1 are conducted to the first capacitor C1 for charging, the voltage across the first capacitor C1 gradually increases, so that the first resistor R1 and the second resistor R2 reach the voltage at which the first transistor Q1 is turned on, and after the first transistor Q1 is turned on, the voltage between the drain and the source of the first MOS transistor M1 is pulled low to reach the turn-on voltage, and the first MOS transistor M1 is turned off. The pure electronic voltage stabilizing circuit is simple in structure and small in size, the first capacitor C1 is located on the output side of the first MOS transistor M1, voltage output is smooth, circuit output power can be large or small, and only a switch tube with appropriate power parameters needs to be selected.

In this embodiment, the first MOS transistor M1 is an N-channel MOS transistor. The first transistor Q1 is an NPN transistor. Certainly, in practical applications, the first MOS transistor M1 may also be a P-channel MOS transistor, and the first transistor Q1 may also be a PNP-type transistor, but the structure of the circuit is also changed accordingly.

In this embodiment, the power module 7 further includes a second capacitor C2, one end of the second capacitor C2 is connected to the gate of the first MOS transistor M1, and the other end of the second capacitor C2 is connected to the collector of the first transistor Q1. The second capacitor C2 is a coupling capacitor for preventing interference between the first MOS transistor M1 and the first transistor Q1, 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 second electric capacity C2 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 triode Q1 not receive the influence of first MOS pipe M1 exactly. The second capacitor C2 is an inter-stage coupling capacitor, and functions to isolate the dc bias circuit between the first MOS transistor M1 and the front and rear stages of the first transistor Q1, 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 second capacitor C2 is 290 pF. Of course, in practical applications, the capacitance value of the second capacitor C2 may be adjusted accordingly, that is, the capacitance value of the second capacitor C2 may be increased or decreased accordingly.

In this embodiment, the power module 7 further includes a third resistor R3, one end of the third resistor R3 is connected to the source of the first MOS transistor M1, and the other end of the third resistor R3 is connected to one end of the first resistor R1, the anode of the first capacitor C1, and one end of the voltage output terminal Vo. The third resistor R3 is a current limiting resistor, and is used for current limiting protection of the source current of the first MOS transistor M1. The current limiting protection principle is as follows: when the source current of the first MOS transistor M1 is large, the third resistor R3 can reduce the source current of the first MOS transistor M1 to keep it in a normal operating state, so as to avoid burning out the components in the circuit due to the large current, thereby further enhancing the safety and reliability of the circuit.

It should be noted that, in the present embodiment, the resistance of the third resistor R3 is 32k Ω. Of course, in practical applications, the resistance of the third resistor R3 may be adjusted according to specific situations, that is, the resistance of the third resistor R3 may be increased or decreased according to specific situations.

In a word, in this embodiment, compared with the power supply part of the conventional teaching all-in-one machine, the power supply module 7 uses fewer components, has a simpler circuit structure, is convenient to maintain, and can reduce the hardware cost due to the fact that some components are saved. In addition, since the power supply module 7 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 teaching all-in-one machine is characterized by comprising a network switch, an industrial computer, an operation panel, a main controller, an audio and video switching module, a digital power amplifier module and a power module, wherein the network switch is respectively connected with the industrial computer, the main controller and the audio and video switching module;

2. The teaching all-in-one machine as claimed in claim 1, wherein the power module further comprises a second capacitor, one end of the second capacitor is connected with the grid electrode of the first MOS transistor, the other end of the second capacitor is connected with the collector electrode of the first triode, and the capacitance value of the second capacitor is 290 pF.

3. The teaching all-in-one machine as claimed in claim 2, wherein the power module further comprises a third resistor, one end of the third resistor is connected with the source electrode of the first MOS transistor, the other end of the third resistor is respectively connected with one end of the first resistor, the positive electrode of the first capacitor and one end of the voltage output end, and the resistance value of the third resistor is 32k Ω.

4. The teaching all-in-one machine as claimed in any one of claims 1 to 3, wherein the first MOS transistor is an N-channel MOS transistor.

5. The teaching all-in-one machine as claimed in any one of claims 1 to 3, wherein the first triode is an NPN type triode.