A teaching workbench with electrostatic discharge alarm function

Abstract

The application discloses a teaching workbench with a static electricity discharge alarm function, and relates to the technical field of static electricity discharge alarm, which comprises a work desk (1), a table top (2) arranged on the work desk (1), a workbench (3) arranged on the table top, a static electricity alarm device arranged on the workbench (3) and a static electricity discharge alarm module arranged in the workbench (3). The abnormal signals and input signals of the static electricity device are collected through the static electricity device input port arranged on the static electricity alarm device. The static electricity discharge detection is carried out through the static electricity discharge alarm module arranged in the workbench. The abnormal alarm of the static electricity device is carried out through the sound and light alarm indicator arranged on the static electricity alarm device. The problem that the static electricity wearing tool of the wearer cannot be found in time when the static electricity wearing tool is loosened or not correctly worn is solved. The electronic components and instruments are prevented from being damaged due to the static electricity breakdown.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of static electricity discharge alarm, and particularly relates to a teaching workbench with a static electricity discharge alarm function. BACKGROUND

[0002] With the progress of science and technology, students and teachers are increasingly exposed to high-precision electronic components and instruments in the teaching process. Experimental measurements show that a human body can generate 250-12000 volts of static electricity when walking on an ethylene resin floor, and can generate 1800 volts or more of static electricity when fidgeting on a chair. Walking on a carpet can generate 1500-35000 volts of static electricity. Generally, when the static electricity exceeds 7000 volts, a person will feel an electric shock. Such high static electricity voltage can cause serious damage to these precision electronic components and instruments.

[0003] Currently, the teaching workbench on the market is connected to the "ground" for processing. The operator connects the workbench to the "ground" through a static electricity wearing tool, such as a bracelet, to discharge the human body static electricity. However, in actual practice, the static electricity wearing tool of the wearer often comes off or is not worn correctly, and is often not discovered in time. If the operation continues, the electronic components and instruments will be damaged by static electricity.

[0004] Therefore, it is an urgent problem for those skilled in the art to provide a new technical solution to improve the above problems. SUMMARY

[0005] Therefore, the present application provides a teaching workbench with a static electricity discharge alarm function to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution:

[0007] A teaching workbench with a static electricity discharge alarm function, comprising: a work desk, a desktop provided on the work desk, a workbench provided on the desktop, a static electricity alarm device provided on the workbench, and a static electricity discharge alarm module provided in the workbench.

[0008] In the above-mentioned solution, the static electricity alarm device is used to receive a power switch operation signal sent by a user, and send the signal to the static electricity alarm device for power connection and disconnection. The static electricity alarm device also provides a static electricity device input port and a conventional power socket, and provides an audible and visual alarm indication for an alarm signal sent by the static electricity discharge alarm module.

[0009] In the above-mentioned solution, the static electricity discharge alarm module is used to detect a static electricity device input signal.

[0010] In the above scheme, the static electricity warning device is provided with a power switch, a static device input port, an audible and visual alarm indicator and a conventional power socket. The power switch is used to receive the power switch operation signal of the user and send it to the static electricity discharge alarm module. The static electricity discharge alarm module controls the connection and disconnection of the power supply between the static electricity warning device and the static electricity discharge alarm module. The static device input port is used to electrically connect with the external static device and collect the input signal of the external static device. The audible and visual alarm indicator is used to receive the alarm signal sent by the static electricity discharge alarm module and perform audible and visual alarm on the alarm signal. The conventional power socket is electrically connected with the external conventional electrical equipment to provide power supply for the external conventional electrical equipment.

[0011] In the above scheme, the static electricity discharge alarm module includes a power supply circuit, a sine wave oscillator circuit and a comparator circuit. The power supply circuit is used to convert the mains into a direct current power supply. The sine wave oscillator circuit is electrically connected with the power supply circuit. The power supply circuit provides power supply for the sine wave oscillator circuit. The sine wave oscillator circuit is used to collect the input signal of the panel and the static electricity wearing device connection port and output the sine wave signal and the high level signal according to the input signal. The comparator circuit is electrically connected with the power supply circuit and the sine wave oscillator circuit. The power supply circuit provides power supply for the comparator circuit. The comparator circuit receives the sine wave signal and the high level signal output by the sine wave oscillator circuit and obtains the corresponding voltage value according to the received sine wave signal or high level signal. The comparator circuit compares the obtained corresponding voltage value with the reference point voltage and outputs the corresponding low level or high level according to the comparison result.

[0012] In the above scheme, the static electricity discharge alarm module further includes a working indication circuit, a square wave oscillation circuit and an audible and visual alarm circuit. The working indication circuit, the square wave oscillation circuit and the audible and visual alarm circuit are all electrically connected with the power supply circuit. The power supply circuit provides power supply for the working indication circuit, the square wave oscillation circuit and the audible and visual alarm circuit. The working indication circuit is electrically connected with the comparator circuit. The working indication circuit is used to receive the low level or high level signal output by the comparator circuit and perform light indication according to the low level or high level signal. The square wave oscillation circuit is electrically connected with the comparator circuit. The square wave oscillation circuit is used to receive the low level or high level signal output by the comparator circuit and output the square wave signal or the low level signal according to the low level or high level signal. The audible and visual alarm circuit is electrically connected with the square wave oscillation circuit. The audible and visual alarm circuit is used to receive the square wave signal or the low level signal output by the square wave oscillation circuit and perform audible and visual alarm according to the square wave signal or the low level signal.

[0013] In the above scheme, the power supply circuit includes an alternating current transformer T, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a voltage stabilizer U, a capacitor C3 and a capacitor C4, the input end of the alternating current transformer T is electrically connected with the power supply interface CN1 provided on the panel through a power switch, the diode D1, the diode D2, the diode D3 and the diode D4 constitute a rectifier bridge, the input end of the rectifier bridge is electrically connected with the output end of the alternating current transformer T, the capacitor C1 and the capacitor C2 are connected in parallel between the output end of the rectifier bridge and the ground, the input end of the voltage stabilizer U is electrically connected with the first end of the capacitor C2, the ground end of the voltage stabilizer U is connected to the ground, the first end of the capacitor C3 is electrically connected with the output end of the voltage stabilizer U, the second end of the capacitor C3 is connected to the ground, the first end of the capacitor C4 is electrically connected with the first end of the capacitor C3, the second end of the capacitor C4 is connected to the ground, and the first end of the capacitor C4 serves as the output end of the direct current power supply VCC.

[0014] In the above scheme, the sine wave oscillator circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C5, a resistor R5, a potentiometer R6, a capacitor C6, a capacitor C7, an operational amplifier A1 and a resistor R7, the first end of the resistor R1 is electrically connected with the electrostatic device input port provided on the panel, the first end of the resistor R2 is electrically connected with the second end of the resistor R1, the first end of the resistor R3 is electrically connected with the second end of the resistor R2, the second end of the resistor R3 is connected to the ground, the first end of the resistor R4 is electrically connected with the first end of the resistor R1, the first end of the capacitor C5 is electrically connected with the second end of the resistor R4, the first end of the resistor R5 is electrically connected with the second end of the capacitor C5, the first end of the potentiometer R6 is electrically connected with the second end of the resistor R5, the first end of the capacitor C6 is electrically connected with the second end of the potentiometer R6, the second end of the capacitor C6 is connected to the ground, the third end of the potentiometer R6 is electrically connected with the ground port CN2, the first end of the capacitor C7 is electrically connected with the second end of the capacitor C5, the non-inverting input end of the operational amplifier A1 is electrically connected with the first end of the resistor R2, the inverting input end of the operational amplifier A1 is electrically connected with the second end of the capacitor C7, the resistor R7 is connected between the inverting input end of the operational amplifier A1 and the output end of the operational amplifier A1, the output end of the operational amplifier A1 is electrically connected with the second end of the resistor R4, the power input end of the operational amplifier A1 is connected with the direct current power supply VCC output by the power supply circuit, the ground end of the operational amplifier A1 is connected to the ground, and the output end of the operational amplifier A1 serves as the output end of the sine wave oscillator circuit.

[0015] In the above scheme, the comparator circuit comprises a diode D5, a resistor R8, a capacitor C8, a resistor R9, a resistor R10 and an operational amplifier A2, the cathode of the diode D5 is electrically connected with the output terminal of the sine wave oscillator circuit, the first end of the resistor R8 is electrically connected with the anode of the diode D5, the capacitor C8 and the resistor R9 are connected in parallel between the DC power supply VCC output by the power supply circuit and the second end of the resistor R8, the first end of the resistor R10 is connected to the DC power supply VCC output by the power supply circuit, the second end of the resistor R10 is electrically connected with the connection point of the resistor R2 and the resistor R3 in the sine wave oscillator circuit and is electrically connected to the ground terminal port CN2, the non-inverting input terminal of the operational amplifier A2 is electrically connected with the second end of the resistor R8, the inverting input terminal of the operational amplifier A2 is electrically connected with the second end of the resistor R10, the power input terminal of the operational amplifier A2 is connected to the DC power supply VCC output by the power supply circuit, the ground terminal of the operational amplifier A2 is connected to the ground, and the output terminal of the operational amplifier A2 serves as the output terminal of the comparator circuit.

[0016] In the above scheme, the working indication circuit comprises a resistor R11 and a light emitting diode L1, the first end of the resistor R11 is electrically connected with the output terminal of the comparator circuit, the first end of the light emitting diode L1 is electrically connected with the second end of the resistor R11, and the second end of the light emitting diode L1 is connected to the ground.

[0017] In the above scheme, the square wave oscillation circuit comprises a resistor R12, a diode D6, a capacitor C9, an operational amplifier A3, a resistor R13 and a resistor R14, the first end of the resistor R12 is electrically connected with the connection point of the resistor R2 and the resistor R3 in the sine wave oscillator circuit, the non-inverting input terminal of the operational amplifier A3 is electrically connected with the second end of the resistor R12, the anode of the diode D6 is electrically connected with the output terminal of the comparator circuit, the first end of the capacitor C9 is electrically connected with the cathode of the diode D6, the second end of the capacitor C9 is connected to the ground, the inverting input terminal of the operational amplifier A3 is electrically connected with the first end of the capacitor C9, the power input terminal of the operational amplifier A3 is connected to the DC power supply VCC output by the power supply circuit, the ground terminal of the operational amplifier A3 is connected to the ground, the resistor R13 is connected between the non-inverting input terminal of the operational amplifier A3 and the output terminal of the operational amplifier A3, the resistor R14 is connected between the inverting input terminal of the operational amplifier A3 and the output terminal of the operational amplifier A3, and the output terminal of the operational amplifier A3 serves as the output terminal of the square wave oscillation circuit.

[0018] In the above scheme, the sound-light alarm circuit comprises an operational amplifier A4, a resistor R15, a resistor R16, a light-emitting diode L2, a buzzer B and a diode D7, the noninverting input terminal of the operational amplifier A4 is electrically connected with the output terminal of the square wave oscillation circuit, the resistor R15 and the resistor R16 are connected in series between the noninverting input terminal of the operational amplifier A4 and the output terminal of the operational amplifier A4, the first terminal of the light-emitting diode L2 is electrically connected with the series connection point of the resistor R15 and the resistor R16, the second terminal of the light-emitting diode L2 is connected to the ground, the inverting input terminal of the operational amplifier A4 is electrically connected with the output terminal of the operational amplifier A4, the power input terminal of the operational amplifier A4 is connected to the DC power supply VCC output by the power supply circuit, the grounding terminal of the operational amplifier A4 is connected to the ground, the first terminal of the buzzer B is electrically connected with the output terminal of the operational amplifier A4, the anode of the diode D7 is electrically connected with the second terminal of the buzzer B, and the cathode of the diode D7 is connected to the ground.

[0019] In conclusion, the present application has the following advantages: the abnormal signal and input signal of the electrostatic device are collected through the electrostatic device input port arranged on the electrostatic alarm device, the electrostatic discharge detection is performed through the electrostatic discharge alarm module arranged in the workbench, and the abnormal alarm of the electrostatic device is performed through the sound-light alarm indicator arranged on the electrostatic alarm device, so that the problem that the electrostatic wearing tool of the wearer is not found in time when the electrostatic wearing tool is loosened or not correctly worn is solved, and the electronic components and instruments are prevented from being damaged due to electrostatic breakdown. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application, and do not limit the present application in any manner.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the teaching workbench with the electrostatic discharge alarm function in the present application.

[0022] Figure 2 It is a structural schematic diagram of the electrostatic alarm device in the present application.

[0023] Figure 3 It is a composition schematic diagram of the electrostatic discharge alarm module in the present application.

[0024] Figure 4 It is a circuit diagram of the power supply circuit in the present application.

[0025] Figure 5 It is a circuit diagram of the electrostatic discharge detection alarm circuit in the present application.

[0026] List of reference numerals: work table 1 , desktop 2 , workbench 3 , power switch 31 , electrostatic device input port 32 , sound and light alarm indicator 33 , conventional power socket 34 . DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0028] like Figure 1 As shown, a teaching workbench with an electrostatic discharge alarm function of the present invention includes: a workbench 1, a desktop 2 arranged on the workbench 1, a workbench 3 arranged on the desktop, an electrostatic alarm device arranged on the workbench 3, and an electrostatic discharge alarm module arranged inside the workbench 3.

[0029] The connection relationship between the above modules of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The electrostatic alarm device is used to receive the power switch operation signal sent by the user and send it to the electrostatic alarm device to connect and disconnect the power supply, as well as provide an electrostatic device input port and a conventional power socket, and provide an audible and visual alarm indication for the alarm signal sent by the electrostatic discharge alarm module; the electrostatic discharge alarm module is used to detect the input signal of the electrostatic device.

[0031] like Figure 2 As shown, the electrostatic alarm device is provided with a power switch 31, an electrostatic device input port 32, an audible and visual alarm indicator 33 and a conventional power socket 34. The power switch 31 is used to receive the user's power switch operation signal and send it to the electrostatic discharge alarm module. The electrostatic discharge alarm module controls the connection and disconnection of the power supply between the electrostatic alarm device and the electrostatic discharge alarm module; the electrostatic device input port 32 is used to be electrically connected to an external electrostatic device and to collect the input signal of the external electrostatic device. The audible and visual alarm indicator 33 is used to receive the alarm signal sent by the electrostatic discharge alarm module and to give an audible and visual alarm for the alarm signal; the conventional power socket 34 is electrically connected to an external conventional electrical device to provide power for the external conventional electrical device.

[0032] In this embodiment, the user can select the electrostatic device input port 32 to connect an electrostatic device. When the electrostatic discharge alarm module obtains an abnormal input signal from the electrostatic device, the sound and light alarm indicator 33 performs a sound and light alarm.

[0033] like Figure 3As shown, the static electricity discharge alarm module includes a power supply circuit 7, a sine wave oscillator circuit 8 and a comparator circuit 9, the power supply circuit 7 is used to convert the mains into a DC power supply; the sine wave oscillator circuit 8 is electrically connected with the power supply circuit 7, the power supply circuit 7 provides power supply for the sine wave oscillator circuit 8, the sine wave oscillator circuit 8 is used to collect the input signals of the panel and the static electricity wearing device connection port, and output the sine wave signal and the high level signal according to the input signals; the comparator circuit 9 is electrically connected with the power supply circuit 7 and the sine wave oscillator circuit 8, the power supply circuit 7 provides power supply for the comparator circuit 9, the comparator circuit 9 receives the sine wave signal and the high level signal output by the sine wave oscillator circuit 8, and obtains the corresponding voltage value according to the received sine wave signal or high level signal, and compares the obtained corresponding voltage value with the reference point voltage, and outputs the corresponding low level or high level according to the comparison result.

[0034] Further, the static electricity discharge alarm module further includes a working indication circuit 10, a square wave oscillation circuit 11 and an audible and visual alarm circuit 12, the working indication circuit 10, the square wave oscillation circuit 11 and the audible and visual alarm circuit 12 are all electrically connected with the power supply circuit 7, the power supply circuit 7 provides power supply for the working indication circuit 10, the square wave oscillation circuit 11 and the audible and visual alarm circuit 12, the working indication circuit 10 is electrically connected with the comparator circuit 9, the working indication circuit 10 is used to receive the low level or high level signal output by the comparator circuit 9, and perform light indication according to the low level or high level signal; the square wave oscillation circuit 11 is electrically connected with the comparator circuit 9, the square wave oscillation circuit 11 is used to receive the low level or high level signal output by the comparator circuit 9, and output the square wave signal or the low level signal according to the low level or high level signal; the audible and visual alarm circuit 12 is electrically connected with the square wave oscillation circuit 11, the audible and visual alarm circuit 12 is used to receive the square wave signal or the low level signal output by the square wave oscillation circuit 11, and perform audible and visual alarm according to the square wave signal or the low level signal.

[0035] As Figure 4As shown, the power supply circuit 7 includes an alternating current transformer T, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a voltage stabilizer U, a capacitor C3 and a capacitor C4. The input end of the alternating current transformer T is electrically connected with the power supply interface CN1 through the power switch 31 arranged on the panel. The diode D1, the diode D2, the diode D3 and the diode D4 constitute a rectifier bridge. The input end of the rectifier bridge is electrically connected with the output end of the alternating current transformer T. The capacitor C1 and the capacitor C2 are connected in parallel between the output end of the rectifier bridge and the ground. The input end of the voltage stabilizer U is electrically connected with the first end of the capacitor C2. The ground end of the voltage stabilizer U is connected with the ground. The first end of the capacitor C3 is electrically connected with the output end of the voltage stabilizer U. The second end of the capacitor C3 is connected with the ground. The first end of the capacitor C4 is electrically connected with the first end of the capacitor C3. The second end of the capacitor C4 is connected with the ground. The first end of the capacitor C4 is used as the output end of the direct current power supply VCC.

[0036] In the embodiment, the alternating current transformer T converts the alternating current 220V voltage into low-voltage alternating current voltage. The rectifier bridge composed of the diode D1, the diode D2, the diode D3 and the diode D4 rectifies the pulsating direct current voltage to output to the capacitor C1 and the capacitor C2 for filtering to generate the non-pulsating direct current voltage to provide for the voltage stabilizer U. The voltage stabilizer U outputs the stable direct current voltage. After the filtering of the capacitor C3 and the capacitor C4, the stable non-pulsating direct current voltage VCC is outputted.

[0037] In the embodiment, the power supply circuit 7 can also be replaced by other forms of power supply meeting the value of the direct current voltage VCC.

[0038] As Figure 5As shown, the sine wave oscillator circuit 8 comprises resistance R1, resistance R2, resistance R3, resistance R4, capacitor C5, resistance R5, potentiometer R6, capacitor C6, capacitor C7, operational amplifier A1 and resistance R7, the first end of the resistance R1 is electrically connected with the electrostatic device input port 32 provided on the panel, the first end of the resistance R2 is electrically connected with the second end of the resistance R1, the first end of the resistance R3 is electrically connected with the second end of the resistance R2, the second end of the resistance R3 is connected to the ground, the first end of the resistance R4 is electrically connected with the first end of the resistance R1, the first end of the capacitor C5 is electrically connected with the second end of the resistance R4, the first end of the resistance R5 is electrically connected with the second end of the capacitor C5, the first end of the potentiometer R6 is electrically connected with the second end of the resistance R5, the first end of the capacitor C6 is electrically connected with the second end of the potentiometer R6, the second end of the capacitor C6 is connected to the ground, the third end of the potentiometer R6 is electrically connected with the ground port CN2, the first end of the capacitor C7 is electrically connected with the second end of the capacitor C5, the non-inverting input end of the operational amplifier A1 is electrically connected with the first end of the resistance R2, the inverting input end of the operational amplifier A1 is electrically connected with the second end of the capacitor C7, the resistance R7 is connected between the inverting input end of the operational amplifier A1 and the output end of the operational amplifier A1, the output end of the operational amplifier A1 is electrically connected with the second end of the resistance R4, the power input end of the operational amplifier A1 is connected to the direct current power supply VCC output by the power supply circuit 7, the grounding end of the operational amplifier A1 is connected to the ground, and the output end of the operational amplifier A1 serves as the output end of the sine wave oscillator circuit 8.

[0039] In the embodiment, the capacitor C5, the resistance R5, the potentiometer R6, the capacitor C6, the capacitor C7, the operational amplifier A1 and the resistance R7 constitute a frequency selection circuit, the resistance R1 and the resistance R4 constitute a positive feedback circuit, in order to make the oscillator output signal reach the maximum amplitude, the center point voltage is designed as 0.5 times VCC, the ground port CN2 is connected to the power grid grounding potential end PE, and the operational amplifier A1 outputs to the comparator circuit 9.

[0040] In the embodiment, when the electrostatic device input port 32 is suspended or the electrostatic wearing device is not in good contact with the human body, the sine wave oscillator circuit 8 normally works and the operational amplifier A1 outputs a sine wave; when the electrostatic device input port 32 is connected with the normally worn electrostatic wearing device, that is, the electrostatic device input port 32 forms a loop with the ground, the potential changes, at this time, the starting condition of the sine wave oscillator circuit 8 is changed, the operational amplifier A1 outputs a high level, about 0.5 times VCC.

[0041] Further, the comparator circuit 9 comprises a diode D5, a resistor R8, a capacitor C8, a resistor R9, a resistor R10 and an operational amplifier A2, the cathode of the diode D5 is electrically connected with the output terminal of the sine wave oscillator circuit 8, the first terminal of the resistor R8 is electrically connected with the anode of the diode D5, the capacitor C8 and the resistor R9 are connected in parallel between the DC power supply VCC output by the power supply circuit 7 and the second terminal of the resistor R8, the first terminal of the resistor R10 is connected to the DC power supply VCC output by the power supply circuit 7, the second terminal of the resistor R10 is electrically connected with the connection point of the resistor R2 and the resistor R3 in the sine wave oscillator circuit 8 and is electrically connected to the ground terminal CN2, the non-inverting input terminal of the operational amplifier A2 is electrically connected with the second terminal of the resistor R8, the inverting input terminal of the operational amplifier A2 is electrically connected with the second terminal of the resistor R10, the power input terminal of the operational amplifier A2 is connected to the DC power supply VCC output by the power supply circuit 7, the ground terminal of the operational amplifier A2 is connected to the ground, and the output terminal of the operational amplifier A2 serves as the output terminal of the comparator circuit 9.

[0042] In the embodiment, the diode D5, the resistor R8 and the capacitor C8 constitute a limiting amplitude and current limiting function, and the reference voltage of the operational amplifier A2 is determined by the voltage division of the resistor R5 and the resistor R10.

[0043] In the embodiment, when the operational amplifier A1 of the sine wave oscillator circuit 8 outputs a sine wave, the output voltage value of the sine wave after limiting amplitude by the diode D5 is , which is less than the reference voltage constituted by the resistor R3 and the resistor R10, at this time, the operational amplifier A2 outputs a low level, about 0V; when the operational amplifier A1 of the sine wave oscillator circuit 8 outputs a high level, the output voltage value of the sine wave after limiting amplitude by the diode D5 is greater than the reference voltage constituted by the resistor R3 and the resistor R10, at this time, the operational amplifier A2 outputs a high level, about VCC value.

[0044] Further, the working indication circuit 10 comprises a resistor R11 and a light emitting diode L1, the first terminal of the resistor R11 is electrically connected with the output terminal of the comparator circuit 9, the first terminal of the light emitting diode L1 is electrically connected with the second terminal of the resistor R11, and the second terminal of the light emitting diode L1 is connected to the ground.

[0045] In the embodiment, when the operational amplifier A2 of the comparator circuit 9 outputs a high level, the light emitting diode L1 emits light to indicate that the electrostatic wearing device is normally worn; when the operational amplifier A2 of the comparator circuit 9 outputs a low level, the light emitting diode L1 is extinguished.

[0046] Further, the square wave oscillation circuit 11 comprises a resistor R12, a diode D6, a capacitor C9, an operational amplifier A3, a resistor R13 and a resistor R14, a first end of the resistor R12 is electrically connected with the connecting point of the resistor R2 and the resistor R3 in the sine wave oscillator circuit 8, a non-inverting input terminal of the operational amplifier A3 is electrically connected with a second end of the resistor R12, an anode of the diode D6 is electrically connected with an output terminal of the comparator circuit 9, a first end of the capacitor C9 is electrically connected with a cathode of the diode D6, a second end of the capacitor C9 is connected to the ground, an inverting input terminal of the operational amplifier A3 is electrically connected with the first end of the capacitor C9, power input terminals of the operational amplifier A3 are connected to the direct current power supply VCC output by the power supply circuit 7, a grounding terminal of the operational amplifier A3 is connected to the ground, the resistor R13 is connected between the non-inverting input terminal of the operational amplifier A3 and an output terminal of the operational amplifier A3, the resistor R14 is connected between the inverting input terminal of the operational amplifier A3 and the output terminal of the operational amplifier A3, and the output terminal of the operational amplifier A3 serves as an output terminal of the square wave oscillation circuit 11.

[0047] In the embodiment, the oscillation frequency of the square wave oscillation circuit 11 is determined by the capacitor C9, the resistor R13 and the resistor R14, when the operational amplifier A2 of the comparator circuit 9 outputs a high level, the diode D6 is reverse cut-off, and the operational amplifier A3 of the square wave oscillation circuit 11 outputs a square wave; when the operational amplifier A2 of the comparator circuit 9 outputs a low level, the diode D6 is forward conducting, and the operational amplifier A3 of the square wave oscillation circuit 11 outputs a low level, about 0V.

[0048] Further, the sound-light alarm circuit 12 comprises an operational amplifier A4, a resistor R15, a resistor R16, a light emitting diode L2, a buzzer B and a diode D7, a non-inverting input terminal of the operational amplifier A4 is electrically connected with an output terminal of the square wave oscillation circuit 11, the resistor R15 and the resistor R16 are connected in series between the non-inverting input terminal of the operational amplifier A4 and an output terminal of the operational amplifier A4, a first end of the light emitting diode L2 is electrically connected with a connecting point of the resistor R15 and the resistor R16, a second end of the light emitting diode L2 is connected to the ground, an inverting input terminal of the operational amplifier A4 is electrically connected with the output terminal of the operational amplifier A4, power input terminals of the operational amplifier A4 are connected to the direct current power supply VCC output by the power supply circuit 7, a grounding terminal of the operational amplifier A4 is connected to the ground, a first end of the buzzer B is electrically connected with the output terminal of the operational amplifier A4, an anode of the diode D7 is electrically connected with a second end of the buzzer B, and a cathode of the diode D7 is connected to the ground.

[0049] In the embodiment, the sound-light alarm indicator 33 can be connected externally to replace the buzzer B. When the operational amplifier A3 of the square wave oscillation circuit 11 outputs a square wave, the operational amplifier A4 of the sound-light alarm indicator circuit 12 outputs a square wave to drive the buzzer B to emit sound intermittently and the light-emitting diode L2 to emit light intermittently. When the operational amplifier A3 of the square wave oscillation circuit 11 outputs a low level, the operational amplifier A4 of the sound-light alarm indicator circuit 12 outputs a low level, and the buzzer B and the light-emitting diode L2 do not work.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. The embodiments of the present application can be variously changed and altered for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A teaching workbench with an electrostatic discharge alarm function, characterized in that: include: A work table (1), a desktop (2) arranged on the work table (1), a workbench (3) arranged on the desktop, an electrostatic alarm device arranged on the workbench (3), and an electrostatic discharge alarm module arranged inside the workbench (3); The electrostatic alarm device is used to receive the power switch operation signal sent by the user and send it to the electrostatic alarm device to connect and disconnect the power supply, provide an electrostatic device input port and a conventional power socket, and provide an audible and visual alarm indication for the alarm signal sent by the electrostatic discharge alarm module; The electrostatic discharge alarm module is used to detect the input signal of the electrostatic device; The electrostatic alarm device is provided with a power switch (31), an electrostatic device input port (32), an audible and visual alarm indicator (33) and a conventional power socket (34). The power switch (31) is used to receive a power switch operation signal from a user and send it to the electrostatic discharge alarm module. The electrostatic discharge alarm module controls the connection and disconnection of the power supply between the electrostatic alarm device and the electrostatic discharge alarm module. The electrostatic device input port (32) is used to electrically connect to an external electrostatic device and collect input signals from the external electrostatic device. The audible and visual alarm indicator (33) is used to receive an alarm signal sent by the electrostatic discharge alarm module and send an audible and visual alarm to the alarm signal. The conventional power socket (34) is electrically connected to an external conventional electrical device to provide power to the external conventional electrical device. The electrostatic discharge alarm module includes a power supply circuit (7), a sine wave oscillator circuit (8) and a comparator circuit (9), wherein the power supply circuit (7) is used to convert the mains power into a DC power supply; the sine wave oscillator circuit (8) is electrically connected to the power supply circuit (7), and the power supply circuit (7) provides power to the sine wave oscillator circuit (8); the sine wave oscillator circuit (8) is used to collect input signals from the panel and the connection port of the electrostatic wearable device, and output a sine wave signal and a high level signal according to the input signal; the comparator circuit (9) is electrically connected to the power supply circuit (7) and the sine wave oscillator circuit (8), and the power supply circuit (7) provides power to the comparator circuit (9), and the comparator circuit (9) receives the sine wave signal and the high level signal output by the sine wave oscillator circuit (8), and obtains a corresponding voltage value according to the received sine wave signal or high level signal, and compares the obtained corresponding voltage value with the reference point voltage, and outputs a corresponding low level or high level according to the comparison result; The electrostatic discharge alarm module further comprises a working indication circuit (10), a square wave oscillation circuit (11) and an audible and visual alarm circuit (12), wherein the working indication circuit (10), the square wave oscillation circuit (11) and the audible and visual alarm circuit (12) are all electrically connected to the power supply circuit (7), and the power supply circuit (7) provides power to the working indication circuit (10), the square wave oscillation circuit (11) and the audible and visual alarm circuit (12), and the working indication circuit (10) is electrically connected to the comparator circuit (9), and the working indication circuit (10) is used to receive the low-level output of the comparator circuit (9). The square wave oscillator circuit (11) is electrically connected to the comparator circuit (9), and the square wave oscillator circuit (11) is used to receive the low level or high level signal output by the comparator circuit (9), and output a square wave signal or a low level signal according to the low level or high level signal; the sound and light alarm circuit (12) is electrically connected to the square wave oscillator circuit (11), and the sound and light alarm circuit (12) is used to receive the square wave signal or the low level signal output by the square wave oscillator circuit (11), and perform a sound and light alarm according to the square wave signal or the low level signal; The power supply circuit (7) includes an AC transformer T, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a voltage regulator U, a capacitor C3 and a capacitor C4. The input end of the AC transformer T is electrically connected to the AC power interface CN1 through a power switch (31) provided on the panel. The diode D1, the diode D2, the diode D3 and the diode D4 form a rectifier bridge. The input end of the rectifier bridge is electrically connected to the output end of the AC transformer T. The capacitor C1 and the capacitor C2 are connected in parallel between the output end of the rectifier bridge and the ground. The input end of the voltage regulator U is electrically connected to the first end of the capacitor C2. The ground end of the voltage regulator U is connected to the ground. The first end of the capacitor C3 is electrically connected to the output end of the voltage regulator U. The second end of the capacitor C3 is connected to the ground. The first end of the capacitor C4 is electrically connected to the first end of the capacitor C3. The second end of the capacitor C4 is connected to the ground. The first end of the capacitor C4 serves as the output end of the DC power supply VCC. The sine wave oscillator circuit (8) includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C5, a resistor R5, a potentiometer R6, a capacitor C6, a capacitor C7, an operational amplifier A1 and a resistor R7, wherein the first end of the resistor R1 is electrically connected to the electrostatic device input port (32) provided on the panel, the first end of the resistor R2 is electrically connected to the second end of the resistor R1, the first end of the resistor R3 is electrically connected to the second end of the resistor R2, the second end of the resistor R3 is connected to the ground, the first end of the resistor R4 is electrically connected to the first end of the resistor R1, the first end of the capacitor C5 is electrically connected to the second end of the resistor R4, the first end of the resistor R5 is electrically connected to the second end of the capacitor C5, the first end of the potentiometer R6 is electrically connected to the second end of the resistor R5, and the first end of the capacitor C6 is electrically connected to the potentiometer The second end of R6 is electrically connected, the second end of the capacitor C6 is connected to the ground, the third end of the potentiometer R6 is electrically connected to the ground port CN2, the first end of the capacitor C7 is electrically connected to the second end of the capacitor C5, the non-inverting input end of the operational amplifier A1 is electrically connected to the first end of the resistor R2, the inverting input end of the operational amplifier A1 is electrically connected to the second end of the capacitor C7, the resistor R7 is connected between the inverting input end of the operational amplifier A1 and the output end of the operational amplifier A1, the output end of the operational amplifier A1 is electrically connected to the second end of the resistor R4, the power input end of the operational amplifier A1 is connected to the DC power supply VCC output by the power supply circuit (7), the ground end of the operational amplifier A1 is connected to the ground, and the output end of the operational amplifier A1 serves as the output end of the sine wave oscillator circuit (8); The comparator circuit (9) includes a diode D5, a resistor R8, a capacitor C8, a resistor R9, a resistor R10 and an operational amplifier A2, wherein the cathode of the diode D5 is electrically connected to the output end of the sinusoidal oscillator circuit (8), the first end of the resistor R8 is electrically connected to the anode of the diode D5, the capacitor C8 and the resistor R9 are connected in parallel between the DC power supply VCC output by the power supply circuit (7) and the second end of the resistor R8, the first end of the resistor R10 is connected to the DC power supply VCC output by the power supply circuit (7), and the anode of the resistor R10 is electrically connected to the output end of the sine wave oscillator circuit (8). The second end is electrically connected to the connection point of the resistor R2 and the resistor R3 in the sine wave oscillator circuit (8), and is electrically connected to the ground port CN2. The non-inverting input end of the operational amplifier A2 is electrically connected to the second end of the resistor R8, and the inverting input end of the operational amplifier A2 is electrically connected to the second end of the resistor R10. The power input end of the operational amplifier A2 is connected to the DC power supply VCC output by the power supply circuit (7). The ground end of the operational amplifier A2 is connected to the ground. The output end of the operational amplifier A2 serves as the output end of the comparator circuit (9).

2. The teaching workbench with electrostatic discharge alarm function according to claim 1 is characterized in that: The working indication circuit (10) comprises a resistor R11 and a light emitting diode L1, wherein a first end of the resistor R11 is electrically connected to an output end of the comparator circuit (9), a first end of the light emitting diode L1 is electrically connected to a second end of the resistor R11, and a second end of the light emitting diode L1 is connected to ground.

3. The teaching workbench with electrostatic discharge alarm function according to claim 1 is characterized in that: The square wave oscillation circuit (11) includes a resistor R12, a diode D6, a capacitor C9, an operational amplifier A3, a resistor R13 and a resistor R14, wherein the first end of the resistor R12 is electrically connected to the connection point between the resistor R2 and the resistor R3 in the sine wave oscillator circuit (8), the non-inverting input end of the operational amplifier A3 is electrically connected to the second end of the resistor R12, the anode of the diode D6 is electrically connected to the output end of the comparator circuit (9), the first end of the capacitor C9 is electrically connected to the cathode of the diode D6, the second end of the capacitor C9 is connected to the ground, and the operational amplifier A3 is electrically connected to the cathode of the diode D6. The inverting input terminal of the operational amplifier A3 is electrically connected to the first end of the capacitor C9, the power input terminal of the operational amplifier A3 is connected to the DC power supply VCC output by the power supply circuit (7), the ground terminal of the operational amplifier A3 is connected to the ground, the resistor R13 is connected between the non-inverting input terminal of the operational amplifier A3 and the output terminal of the operational amplifier A3, the resistor R14 is connected between the inverting input terminal of the operational amplifier A3 and the output terminal of the operational amplifier A3, and the output terminal of the operational amplifier A3 serves as the output terminal of the square wave oscillation circuit (11).

4. The teaching workbench with electrostatic discharge alarm function according to claim 1 is characterized in that: The sound and light alarm circuit (12) includes an operational amplifier A4, a resistor R15, a resistor R16, a light emitting diode L2, a buzzer B and a diode D7, wherein the non-inverting input terminal of the operational amplifier A4 is electrically connected to the output terminal of the square wave oscillation circuit (11), the resistor R15 and the resistor R16 are connected in series between the non-inverting input terminal of the operational amplifier A4 and the output terminal of the operational amplifier A4, the first terminal of the light emitting diode L2 is electrically connected to the series connection point of the resistor R15 and the resistor R16, the second terminal of the light emitting diode L2 is connected to the ground, the inverting input terminal of the operational amplifier A4 is electrically connected to the output terminal of the operational amplifier A4, the power input terminal of the operational amplifier A4 is connected to the DC power supply VCC output by the power supply circuit (7), the ground terminal of the operational amplifier A4 is connected to the ground, the first terminal of the buzzer B is electrically connected to the output terminal of the operational amplifier A4, the anode of the diode D7 is electrically connected to the second terminal of the buzzer B, and the cathode of the diode D7 is connected to the ground.

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