CN210244197U

CN210244197U - Touch inquiry machine with quick inquiry function

Info

Publication number: CN210244197U
Application number: CN201921006401.2U
Authority: CN
Inventors: Meixian Zhou; 周美贤; Xiangqing Cen; 岑祥庆; Yonghuai Chen; 陈永淮; Qijun Xie; 谢奇君
Original assignee: Guangzhou Touch Pie Electronic Technology Co ltd
Current assignee: Guangzhou Touch Pie Electronic Technology Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-04-03
Anticipated expiration: 2029-06-28

Abstract

The utility model discloses a touch inquiry machine with a quick inquiry function, which comprises a box body, wherein the box body consists of a panel, a box frame consisting of four side peripheries and a bottom plate, the bottom plate and the box frame form an open cavity body, and a singlechip, a vibration sensor, a memory, a power amplifier circuit, a power module, a man-machine interaction circuit and a recording circuit are arranged in the cavity body; the power module comprises a transformer, a first diode, a first capacitor, a second diode, a second capacitor, a rectifier bridge, a third capacitor, a fourth diode, a first triode, a second triode, a third diode, a first resistor, a second potentiometer, a fourth capacitor and a voltage output end, one end of a primary coil of the transformer is connected with one end of 220V alternating current, and the other end of the primary coil of the transformer is connected with the other end of the 220V alternating current. 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

Touch inquiry machine with quick inquiry function

Technical Field

The utility model relates to an inquiry machine circuit field, in particular to touch inquiry machine with swift inquiry function.

Background

The touch inquiry machine (hereinafter referred to as inquiry machine) is the most convenient, simple, natural and practical man-machine interaction equipment, and integrates computer technology, multimedia technology, sound technology, network technology, industrial modeling art and mechanical manufacturing technology, and is in streamline integrated design and attractive in modeling. Touch query machines are increasingly being used in various aspects of our daily life and work. The integrated machine can be seen in many occasions such as telecom business halls, post business halls, tax collection halls, city street (city information inquiry), office buildings, airports, stations, banks, museums, libraries, exhibitions, hospitals, hotels and hotels.

Fig. 1 is a schematic circuit diagram of a power supply portion of a conventional touch query machine, and it can be seen from fig. 1 that the power supply portion of the conventional touch query machine has many components, a complex circuit structure, high hardware cost and inconvenient maintenance. In addition, since the power supply part of the conventional touch inquiry machine lacks a corresponding circuit protection function, 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 touch inquiry machine that has swift inquiry function of reliability of convenient maintenance, circuit is provided.

The utility model provides a technical scheme that its technical problem adopted is: a touch inquiry machine with a quick inquiry function is constructed, and comprises a box body, wherein the box body consists of a panel, a box frame and a bottom plate, the box frame consists of four side peripheries, the bottom plate and the box frame form an open cavity body, a single chip microcomputer, a vibration sensor, a memory, a power amplifier circuit, a power module, a man-machine interaction circuit and a recording circuit are arranged in the cavity body, the man-machine interaction circuit is connected with the single chip microcomputer through a bus, the single chip microcomputer is respectively connected with the vibration sensor, the memory, the power amplifier circuit and the power module through the bus, a touch display screen is arranged on the panel, the touch display screen is connected with the man-machine interaction circuit through an output interface, and the recording circuit is connected with the single chip microcomputer;

the power module comprises a transformer, a first diode, a first capacitor, a second diode, a second capacitor, a rectifier bridge, a third capacitor, a fourth diode, a first triode, a second triode, a third diode, a first resistor, a second potentiometer, a fourth capacitor and a voltage output end, one end of a primary coil of the transformer is connected with one end of 220V alternating current, the other end of the primary coil of the transformer is connected with the other end of the 220V alternating current, one end of a secondary coil of the transformer is respectively connected with an anode of the first diode and one input end of the rectifier bridge, a cathode of the first diode is respectively connected with one end of the first capacitor and an anode of the second diode, the other end of a secondary coil of the transformer is respectively connected with the other end of the first capacitor and the other input end of the rectifier bridge, a cathode of the second diode is respectively connected with one end of the second capacitor and an anode of the fourth diode, one output end of the rectifier bridge is respectively connected with one end of the first capacitor and the collector electrode of the first triode, the base electrode of the first triode is respectively connected with the cathode of the fourth diode and the collector electrode of the second triode, the emitter of the first triode is respectively connected with one end of the first resistor, one fixed end of the second potentiometer, one end of the fourth capacitor and the voltage output end, the base electrode of the second triode is connected with the sliding end of the second potentiometer, the emitting electrode of the second triode is respectively connected with the cathode of the third diode and the other end of the first resistor, the other end of the second capacitor is respectively connected with the other output end of the rectifier bridge, the other end of the third capacitor, the anode of the third diode, the other fixed end of the second potentiometer and the other end of the fourth capacitor, and the fourth diode is S-352T in model.

In the touch query machine with shortcut query function, the power module further includes a fifth capacitor, one end of the fifth capacitor is connected to the base of the first triode, the other end of the fifth capacitor is connected to the cathode of the fourth diode and the collector of the second triode, and the capacitance of the fifth capacitor is 430 pF.

In the touch query machine with shortcut query function, the power module further includes a third resistor, one end of the third resistor is connected to the emitter of the first triode, the other end of the third resistor is connected to one end of the first resistor, one fixed end of the second potentiometer, one end of the fourth capacitor and the voltage output end, and the resistance of the third resistor is 32k Ω.

In the touch query machine with the shortcut query function of the present invention, the first triode is an NPN-type triode.

In the touch query machine with the shortcut query function of the present invention, the second triode is an NPN-type triode.

Implement the utility model discloses a touch inquiry machine with swift inquiry function has following beneficial effect: because of being equipped with the box body, the box body comprises panel, box frame and the bottom plate that four side peripheries constitute, bottom plate and box frame constitute an open-ended cavity body, the internal singlechip that is equipped with of cavity, vibration sensor, the memory, power amplifier circuit, the power module, man-machine interaction circuit and recording circuit, the power module includes the transformer, first diode, first electric capacity, the second diode, the second electric capacity, the rectifier bridge, the third electric capacity, the fourth diode, first triode, the second triode, the third diode, first resistance, the second potentiometre, fourth electric capacity and voltage output end, this power module compares with the power supply part of traditional touch inquiry machine, 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 fourth diode is used for 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 the power supply portion of a conventional touch query machine;

fig. 2 is a schematic structural diagram of an embodiment of a touch query machine with a quick query function according to 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 touch inquiry machine embodiment with swift inquiry function, this touch inquiry machine with swift inquiry function's schematic structure view is shown in FIG. 2. In fig. 2, this touch inquiry machine with swift inquiry function includes the box body, the box body is by the panel, box frame and bottom plate that four side peripheries constitute are constituteed, bottom plate and box frame constitute an open-ended cavity body, the internal singlechip 1 that is equipped with of cavity, vibration sensor 2, memory 3, power amplifier circuit 4, power module 5, human-computer interaction circuit 6 and recording circuit 7, wherein, human-computer interaction circuit 6 passes through the bus and is connected with singlechip 1, singlechip 1 passes through the bus respectively with vibration sensor 2, memory 3, power amplifier circuit 4 and power module 5 are connected, be equipped with touch-control display screen 8 on the panel, touch-control display screen 8 passes through output interface and is connected with human-computer interaction circuit 6, recording circuit 7 is connected with singlechip 1.

The vibration sensor 2 is arranged to be beneficial to quickly starting the touch inquiry machine with the quick inquiry function in a severe environment. The recording circuit 7 may further enhance the real-time recording function. The power module 5 is used for providing a working power supply for the singlechip 1.

The single chip microcomputer 1, the vibration sensor 2, the memory 3, the power amplifier circuit 4, the man-machine interaction circuit 6, the recording circuit 7 and the touch display screen 8 are all realized by adopting structures in the prior art, the working principle of the touch display screen is also the working principle in the prior art, and the description is not repeated here.

Fig. 3 is a schematic circuit diagram of a power module in this embodiment, in fig. 3, the power module 5 includes a transformer T, a first diode D1, a first capacitor C1, a second diode D2, a second capacitor C2, a rectifier bridge Z, a third capacitor C3, a fourth diode D4, a first transistor Q1, a second transistor Q2, a third diode D3, a first resistor R1, a second potentiometer RP2, a fourth capacitor C4 and a voltage output Vo, wherein one end of a primary coil of the transformer T is connected to one end of 220V ac, the other end of the primary coil of the transformer T is connected to the other end of the 220V ac, one end of a secondary coil of the transformer T is connected to an anode of the first diode D1 and one input end of the rectifier bridge Z, a cathode of the first diode D1 is connected to one end of the first capacitor C1 and an anode of the second diode D2, and the other end of the secondary coil of the transformer T is connected to the other end of the first diode C6342 and the other input end of the rectifier bridge Z1, the cathode of the second diode D2 is connected to one end of the second capacitor C2 and the anode of the fourth diode D4, one output end of the rectifier bridge Z is connected to one end of the first capacitor C1 and the collector of the first triode Q1, the base of the first triode Q1 is connected to the cathode of the fourth diode D4 and the collector of the second triode Q2, the emitter of the first triode Q1 is connected to one end of the first resistor R1, one fixed end of the second potentiometer RP2, one end of the fourth capacitor C4 and the voltage output Vo, the base of the second triode Q2 is connected to the sliding end of the second potentiometer RP2, the emitter of the second triode Q2 is connected to the cathode of the third diode D3 and the other end of the first resistor R1, the other end of the second capacitor C2 is connected to the other output end of the rectifier bridge Z, the other end of the third capacitor C3, and the anode of the third diode D3, The other fixed end of the second potentiometer RP2 is connected to the other end of the fourth capacitor C4.

Compared with the power supply part of the traditional touch inquiry machine in fig. 1, the power supply module 5 has the advantages that the number of used components is small, the circuit structure is simple and convenient to maintain, and the hardware cost can be reduced due to the fact that some components are saved. The fourth diode D4 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 fourth diode D4 is located is large, the current of the branch where the fourth diode D4 is located can be reduced by the fourth diode D4, so that the branch is kept in a normal working state, and the components in the circuit are not burned out due to too 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 achieved by fewer components.

It should be noted that in the present embodiment, the model of the fourth diode D4 is S-352T. Of course, in practical applications, the fourth diode D4 may also be another type of diode with similar functions.

The output voltage of the voltage output end Vo is 12V direct current.

The working principle of the power module 5 is as follows: the secondary coil of the transformer T, the first diode D1, the first capacitor C1, the second diode D2 and the second capacitor C2 form a voltage-doubling rectifying circuit, the power supply charges the first capacitor C1 in the positive half cycle of the 220V alternating current, and the power supply voltage and the voltage of the first capacitor C1 are added in the negative half cycle of the 220V alternating current and then are charged to the second capacitor C2 through the second diode D2, so that the second capacitor C2 can obtain twice power supply voltage. The double power supply voltage is provided to the base of the first transistor Q1, so that the voltage difference between the base and the emitter of the first transistor Q1 can be small, and the voltage difference between the collector and the emitter can be reduced to a voltage close to saturation, thereby reducing the power consumption of the transistor and greatly improving the efficiency of the power module 5.

The circuit formed by the first resistor R1 and the second diode D2 provides a reference voltage for the second transistor Q2, and the emitter of the second transistor Q2 has a constant potential due to the presence of the second diode D2. The base potential of the second transistor Q2 sampled by the second potentiometer RP2 is compared with the emitter potential, and the collector potential is changed by the collector output of the second transistor Q2 as a result of the comparison, so as to control the conduction degree of the second transistor Q2 (the second transistor Q2 plays a role of a variable resistor here), thereby achieving the purpose of automatically stabilizing the output voltage. When no load or the load resistance is large, the output voltage tends to rise, at this time, the base level of the second triode Q2 obtained by sampling rises → the collector current of the second triode Q2 increases, the base current of the first triode Q1 decreases, the conduction of the first triode Q1 decreases → the output current of the power module 5 decreases, and the voltage falls back, thereby realizing voltage stabilization.

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

In this embodiment, the power module 5 further includes a fifth capacitor C5, one end of the fifth capacitor C5 is connected to the base of the first transistor Q1, and the other end of the fifth capacitor C5 is connected to the cathode of the fourth diode D4 and the collector of the second transistor Q2, respectively. The fifth capacitor C5 is a coupling capacitor for preventing interference between the first transistor Q1 and the second transistor Q2, 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 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, that is to say make second triode Q2's operating point not receive first triode Q1's influence. The fifth capacitor C5 is an inter-stage coupling capacitor, and functions to isolate the dc bias circuits of the front and rear stages of the first transistor Q1 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 of the fifth capacitor C5 is 430 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 5 further includes a third resistor R3, one end of the third resistor R3 is connected to the emitter of the first transistor Q1, and the other end of the third resistor R3 is connected to one end of the first resistor R1, one fixed end of the second potentiometer RP2, one end of the fourth capacitor C4, and the voltage output terminal Vo. The third resistor R3 is a current limiting resistor, and is used for current limiting protection of the emitter current of the first transistor Q1. The current limiting protection principle is as follows: when the emitter current of the first triode Q1 is large, the third resistor R3 can reduce the emitter current of the first triode Q1 to keep the first triode Q1 in a normal working state, so that the elements in the circuit are not burnt out due to the large current, and the safety and reliability of the circuit are further enhanced.

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 short, in this embodiment, compared with the power supply part of the conventional touch query machine, the power supply module 15 has fewer used components, a simpler circuit structure and convenience in maintenance, and can reduce the hardware cost due to the fact that some components are saved. In addition, since the power supply module 15 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 touch inquiry machine with a quick inquiry function is characterized by comprising a box body, wherein the box body consists of a panel, a box frame and a bottom plate, the box frame and the bottom plate are formed by the periphery of four sides, the bottom plate and the box frame form an open cavity body, a single chip microcomputer, a vibration sensor, a storage, a power amplifier circuit, a power module, a man-machine interaction circuit and a recording circuit are arranged in the cavity body, the man-machine interaction circuit is connected with the single chip microcomputer through a bus, the single chip microcomputer is respectively connected with the vibration sensor, the storage, the power amplifier circuit and the power module through the bus, a touch display screen is arranged on the panel, the touch display screen is connected with the man-machine interaction circuit through an output interface, and the recording circuit is connected with the single chip microcomputer;

2. The touch query machine with the shortcut query function of claim 1, wherein the power module further comprises a fifth capacitor, one end of the fifth capacitor is connected to the base of the first triode, the other end of the fifth capacitor is respectively connected to the cathode of the fourth diode and the collector of the second triode, and the capacitance of the fifth capacitor is 430 pF.

3. The touch query machine with the shortcut query function according to claim 2, wherein the power module further comprises a third resistor, one end of the third resistor is connected to the emitter of the first triode, the other end of the third resistor is respectively connected to one end of the first resistor, one fixed end of the second potentiometer, one end of the fourth capacitor and the voltage output end, and the resistance value of the third resistor is 32k Ω.

4. The touch inquiry machine with the shortcut inquiry function of any one of claims 1 to 3, wherein said first triode is an NPN-type triode.

5. The touch inquiry machine with the shortcut inquiry function of any one of claims 1 to 3, wherein said second triode is an NPN-type triode.