CN214435861U

CN214435861U - Conference equipment

Info

Publication number: CN214435861U
Application number: CN202023211734.4U
Authority: CN
Inventors: 邰德民
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-22
Anticipated expiration: 2030-12-28

Abstract

The utility model provides a conference device, which comprises a conference device body and a mounting cavity; the negative ion generator is arranged in the installation cavity and comprises piezoelectric ceramics, a negative ion generation host and a negative ion converter, wherein the negative ion generation host and the negative ion converter are arranged on the piezoelectric ceramics; the direct current power supply is arranged in the conference equipment body; the negative ion generation host comprises a boost oscillating circuit and a voltage-multiplying rectifying circuit connected with the boost oscillating circuit, wherein the boost oscillating circuit is used for boosting and oscillating direct-current voltage output by a direct-current power supply, and the output end of the voltage-multiplying rectifying circuit is connected with at least one fullerene carbon fiber and is used for rectifying alternating-current voltage formed after boost oscillation; and the negative ion converter is used for reducing the particle size of air negative ions generated by the fullerene carbon fiber. The utility model discloses a scheme can make meeting equipment possess the anion and take place the function.

Description

Conference equipment

Technical Field

The utility model relates to a daily life technical field, in particular to meeting equipment.

Background

At present, the sub-health population in China accounts for 70 percent of the total population, and 9.8 hundred million people are in a sub-health state. In recent years, the anion health care technology in China is developed rapidly, and a large number of anion health care equipment enters clinical application.

Conference equipment is equipment which is indispensable in daily life of people, and a conference area generates a large amount of positive ions, which makes people easily induce various sub-health states.

Therefore, there is a need to provide a conference device to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a meeting equipment can make meeting equipment possess the anion and take place the function.

An embodiment of the utility model provides a conference equipment, include:

the conference equipment comprises a conference equipment body, a conference equipment body and a conference equipment body, wherein the conference equipment body is provided with a mounting cavity, and the outer side of the mounting cavity is provided with at least one negative ion diffusion port;

the negative ion generator is arranged in the installation cavity and comprises piezoelectric ceramics, and a negative ion generation host and a negative ion converter which are arranged on the piezoelectric ceramics, wherein the output end of the negative ion generation host is connected with at least one fullerene carbon fiber, and each negative ion diffusion opening is provided with one corresponding fullerene carbon fiber;

the direct current power supply is arranged in the conference equipment body;

the negative ion generation host comprises a boost oscillating circuit and a voltage-multiplying rectifying circuit connected with the boost oscillating circuit, wherein the boost oscillating circuit is used for boosting and oscillating direct-current voltage output by the direct-current power supply, and the output end of the voltage-multiplying rectifying circuit is connected with the at least one fullerene carbon fiber wire and is used for rectifying alternating-current voltage formed after boosting and oscillating;

the negative ion converter is used for reducing the particle size of air negative ions generated by the fullerene carbon fiber.

In one possible design, the negative ion generator further includes: at least one negative ion guide tube;

each negative ion diffusion opening is butted with one negative ion guide pipe, and the negative ion guide pipes are positioned in the installation cavity;

aiming at each negative ion diffusion opening, the fullerene carbon fiber corresponding to the negative ion diffusion opening is positioned in the negative ion guide tube which is butted with the negative ion diffusion opening.

In one possible design, each of the negative ion guide tubes is made of an insulating material.

In one possible design, further comprising: a switch module;

the switch module is connected with the negative ion generation host;

and the switch module is used for controlling the switching action of the negative ion generation host machine.

In one possible design, further comprising: the system comprises a main control module and a communication module;

the main control module is respectively connected with the switch module and the communication module;

the main control module is used for receiving a control instruction sent by external terminal equipment or a server through the communication module so as to control the switch module to execute the switching action on the negative ion generating host.

In a possible design, the boost oscillating circuit includes a first boost oscillating module and a second boost oscillating module, the first boost oscillating module, the second boost oscillating module and the voltage doubling rectifying circuit are connected in sequence, the first boost oscillating module is used for boosting and oscillating a first direct current voltage output by the direct current power supply and outputting a first alternating current voltage to the second boost oscillating module, the second boost oscillating module is used for receiving the first alternating current voltage, rectifying the first alternating current voltage into a second direct current voltage, and boosting and oscillating the second direct current voltage so as to output a second alternating current voltage to the voltage doubling rectifying circuit.

In one possible design, the first boost oscillating module includes a first resistor, a second resistor, a triode and a first transformer, the first transformer comprises a first primary coil, a second primary coil and a first secondary coil, one end of the first resistor is used for being respectively connected with the positive pole of the direct current power supply and one end of the first primary coil, the other end of the first resistor is respectively connected with the base electrode of the triode and the negative electrode of the direct current power supply, the other end of the first primary coil is electrically connected with the collector of the triode, the emitter of the triode is used for being connected with the negative electrode of the direct current power supply, the second resistor and the second primary coil are connected in series between the base of the triode and the negative electrode of the direct current power supply, one end of the first secondary coil is connected with the base electrode of the triode, and the other end of the first secondary coil is connected with the second boosting oscillation module.

In one possible design, the first boost oscillating module further includes a third diode, and the third diode is connected in series between the base of the triode and the negative electrode of the dc power supply.

In a possible design, the second boost oscillating module includes a fourth diode, a fifth diode, a capacitor, and a second transformer, the fourth diode and the capacitor are connected in series between the output end of the first boost oscillating module and the negative electrode of the dc power supply, the positive electrode of the fourth diode is electrically connected to the output end of the first boost oscillating module, the fifth diode is a high-voltage trigger diode, the second transformer includes a third primary coil and a second secondary coil, the negative electrode of the fifth diode is connected to the negative electrode of the fourth diode, the positive electrode of the fifth diode is connected to one end of the third primary coil, the other end of the third primary coil is connected to the negative electrode of the dc power supply, and the second secondary coil is connected to the voltage-doubling rectifying circuit.

In a possible design, the negative ion generating host further includes a protection circuit, the protection circuit is connected in series between the positive electrode of the dc power supply and the boost oscillating circuit, the protection circuit includes a sixth diode and a third resistor, and the positive electrode of the sixth diode is connected to the positive electrode of the dc power supply.

According to the technical scheme, high-voltage direct current generated by the negative ion generating host is applied to the fullerene carbon fiber filaments to generate air negative ions, so that the air negative ions can be diffused to the outside of the conference equipment; meanwhile, the negative ion generator is more miniaturized by integrating the negative ion generation host and the negative ion converter on the piezoelectric ceramic, so that the negative ion generator can be conveniently arranged in the conference equipment, and the conference equipment has a negative ion generation function. Moreover, the negative ion generator adopts fullerene material (actually a superconducting material with the resistance close to zero) as a release tip, which is beneficial to the free precipitation of electric ions, can generate ecological level small-particle-size negative oxygen ions with small particle size, high activity and long migration distance only by weak current, has high purity, and does not generate derivatives such as ozone, positive ions and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are 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 diagram of a conference device provided by an embodiment of the present invention;

fig. 2 is a communication schematic diagram of a conference device according to an embodiment of the present invention;

fig. 3 is a circuit diagram of the negative ion generating main unit in the conference apparatus shown in fig. 1.

10-conference equipment body, 11-installation cavity, 12-negative ion diffusion port, 20-negative ion generator, 21-piezoelectric ceramic, 22-negative ion generation host, 23-negative ion converter, 24-fullerene carbon fiber filament, 221-boost oscillation circuit, 221 a-first boost oscillation module, 221 b-second boost oscillation module, 222-voltage doubling rectification circuit, 223-protection circuit, 30-direct current power supply, 41-switch module, 42-main control module and 43-communication module.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.

Fig. 1 is a schematic diagram of a conference device according to an embodiment of the present invention. As shown in fig. 1, the conference device includes a conference device body 10, an anion generator 20, and a direct current power supply 30, wherein:

the conference equipment comprises a conference equipment body 10, a mounting cavity 11 and at least one negative ion diffusion port 12, wherein the mounting cavity 11 is arranged on the outer side of the conference equipment body;

the negative ion generator 20 is arranged in the mounting cavity 11, the negative ion generator 20 comprises piezoelectric ceramics 21, and a negative ion generating host 22 and a negative ion converter 23 which are arranged on the piezoelectric ceramics 21, the output end of the negative ion generating host 22 is connected with at least one fullerene carbon fiber filament 24, and each negative ion diffusion port 12 is provided with a corresponding fullerene carbon fiber filament 24;

a dc power supply 30 provided in the conference device body 10;

the negative ion generation host 22 comprises a boost oscillation circuit 221 and a voltage-doubling rectifying circuit 222 connected with the boost oscillation circuit 221, wherein the boost oscillation circuit 221 is used for boosting and oscillating the direct-current voltage output by the direct-current power supply 30, and the output end of the voltage-doubling rectifying circuit 222 is connected with at least one fullerene carbon fiber wire 24 and is used for rectifying the alternating-current voltage formed after boosting and oscillating;

and an anion converter 23 for reducing the particle diameter of the negative air ions generated from the fullerene carbon fiber filament 24.

In the embodiment of the utility model, the high voltage direct current generated by the negative ion generating host is applied to the fullerene carbon fiber to generate air negative ions, so that the air negative ions can be diffused to the outside of the conference equipment; meanwhile, the negative ion generator is more miniaturized by integrating the negative ion generation host and the negative ion converter on the piezoelectric ceramic, so that the negative ion generator can be conveniently arranged in the conference equipment, and the conference equipment has a negative ion generation function. Moreover, after the conference equipment has the anion generating function, the user does not need to spend time for anion health care, and can enjoy anion health care when in a meeting.

It should be noted that the anion generator is a nano-fullerene anion generator, which uses fullerene C60 material as a release tip, and fullerene is an electro-catalytic material manufactured by nano-technology, which is a superconducting material with a resistance close to zero, and only needs a relatively weak current to ionize air to release a large amount of high-purity air anions, and thus, unlike the conventional anion generator, it is not easy to generate ozone, nitrogen oxides and other derived pollutants.

The air anions have medical care effect on human bodies, the air anions with small particle size can easily permeate the blood brain barrier of the human bodies to play the biological effect, the medical care effect is achieved, and the physical and mental health of users is improved; and the air negative ions with large particle size can refresh air, eliminate smoke and dust and play a role in purifying the environment.

It should be further noted that the specific operation principle and structural composition of the anion converter are well known to those skilled in the art, and are not described in detail herein.

It can be understood that the conference equipment can be a wireless microphone, a microphone holder, a seat label rack or a document folder, and the negative ion generator can be accommodated in the conference equipment because the negative ion generating host and the negative ion converter are integrated on the piezoelectric ceramic, so that the negative ion generator is more miniaturized.

It will be appreciated that the dc power source may be a dry cell or a battery, which may be a low voltage battery, such as 5 v or 12 v, for example, a button dry cell, so that the open volume of the mounting cavity 11 is not too large, thereby allowing the ionizer and the dc power source to be accommodated in the conference facility.

In an embodiment of the present invention, the anion generator 20 further includes: at least one negative ion guide tube (not shown);

each negative ion diffusion opening 12 is butted with a negative ion guide pipe, and the negative ion guide pipe is positioned in the mounting cavity 11;

for each negative ion diffusion opening 12, the fullerene carbon fiber filament 24 corresponding to the negative ion diffusion opening 12 is located in a negative ion guide tube in abutment with the negative ion diffusion opening 12.

The embodiment of the utility model provides an in, through setting up the anion stand pipe, can be so that the produced air anion of fullerene carbon fiber silk can spread along the anion stand pipe for fullerene carbon fiber silk has had certain directional diffusivity.

In one embodiment of the present invention, each negative ion guide tube is made of an insulating material. By the arrangement, the fullerene carbon fiber can be prevented from damaging a human body, and a good shielding effect on high-voltage static electricity generated by the shell is ensured.

Fig. 2 is a communication schematic diagram of a conference device according to an embodiment of the present invention. As shown in fig. 2, the conference device further includes: a switch module 41;

the switch module 41 is connected with the negative ion generating host 22;

and a switch module 41 for controlling the switching operation of the anion generating main machine 22.

The embodiment of the utility model provides an in, if not set up switch module, when the direct current power supply circular telegram, the host computer will work is taken place to the anion, when the user does not want to use the anion to take place the function, need take out direct current power supply (button cell for example), so can reduce user's use and experience. Therefore, in order to facilitate the controllability of the user on the negative ion generating host, the switch module can be arranged, so that the user can turn off the negative ion generating host when the user does not want the negative ion generating host to work. The switch module may be an analog circuit or a digital circuit, and one end facing the user may be a physical key, a touch key, or a voice control, which is not described herein.

With continued reference to fig. 2, the conference device further includes: a main control module 42 and a communication module 43;

the main control module 42 is respectively connected with the switch module 41 and the communication module 43;

and a main control module 42, configured to receive a control command sent by an external terminal device or a server through the communication module 43, so as to control the switch module 41 to perform a switching operation on the negative ion generating host 22.

The embodiment of the utility model provides an in, can realize user's remote control through setting up host system and communication module. The communication module may be a wifi module, for example.

The following describes the constituent circuit of the negative ion generating main unit in detail.

Fig. 3 is a circuit diagram of the negative ion generating main unit in the conference apparatus shown in fig. 1. As shown in fig. 3, the boost oscillating circuit 221 includes a first boost oscillating module 221a and a second boost oscillating module 221b, the first boost oscillating module 221a, the second boost oscillating module 221b and the voltage doubling rectifying circuit 222 are sequentially connected, the first boost oscillating module 221a is configured to boost and oscillate a first dc voltage output by the dc power supply 30 and output a first ac voltage to the second boost oscillating module 221b, and the second boost oscillating module 221b is configured to receive the first ac voltage, rectify the first ac voltage into a second dc voltage, and boost and oscillate the second dc voltage so as to output the second ac voltage to the voltage doubling rectifying circuit 222.

In the embodiment of the present invention, the initial voltage can be increased to a predetermined voltage (for example, 10KV or more) by using the two-stage step-up oscillation module. Of course, more stages of boost oscillation modules may be further provided to boost the initial voltage, and the boost oscillation circuit capable of oscillating the initial voltage to the preset voltage through boost oscillation may be used as the boost oscillation circuit of the present embodiment.

Specifically, the composition of the first boost oscillation module 221a in the boost oscillation circuit 221 may be as follows:

the first boost oscillating module 221a includes a first resistor R1, a second resistor R2, a transistor Q1, and a first transformer T1, the first transformer T1 includes a first primary coil, a second primary coil, and a first secondary coil, one end of the first resistor R1 is configured to be connected to the positive electrode of the dc power supply 30 and one end of the first primary coil, the other end of the first resistor R1 is connected to the base of the transistor Q1 and the negative electrode of the dc power supply 30, the other end of the first primary coil is electrically connected to the collector of the transistor Q1, the emitter of the transistor Q1 is configured to be connected to the negative electrode of the dc power supply 30, the second resistor R2 and the second primary coil are connected in series between the base of the transistor Q1 and the negative electrode of the dc power supply 30, one end of the first secondary coil is connected to the base of the transistor Q1, and the other end of the first secondary coil is connected to the second boost oscillating module 221 b.

The embodiment of the present invention provides a transformer, which is a device using the principle of electromagnetic induction to change the ac voltage, wherein the first transformer is used to boost the voltage outputted by the dc power supply for the first time. Because the first transformer can only change alternating current voltage, and the direct current power supply outputs direct current voltage, the direct current voltage output by the direct current power supply needs to be converted into alternating current voltage through self-oscillation of the triode, and then the converted alternating current voltage is boosted into first alternating current voltage through the first transformer and output to the second boosting oscillation module. In this embodiment, the first transformer also functions as an inductor, and the first transformer and the transistor form a loop, so that the transistor can generate a constant and continuous oscillation by itself without applying an excitation signal. The first resistor is used for triggering oscillation, when the first resistor starts to trigger, the oscillation starts, and after the oscillation starts, the first resistor does not have the function of triggering the oscillation any more. At this time, the second resistor performs a function of triggering oscillation.

In an embodiment of the present invention, the first boost oscillating module 221a further includes a third diode D3, and the third diode D3 is connected in series between the base of the transistor Q1 and the negative electrode of the dc power supply 30.

The embodiment of the utility model provides an in, because oscillating circuit still can produce the back electromotive force, and the first component that vibrates the module that steps up can be burnt out to the back electromotive force, consequently first step up and vibrate the module through setting up the third diode, the third diode is used for absorbing the back electromotive force to realize protection circuit's function.

Specifically, the composition of the second boost oscillation module 221b in the boost oscillation circuit 221 may be as follows:

the second boost oscillating module 221b includes a fourth diode D4, a fifth diode D5, a capacitor C0, and a second transformer T2, the fourth diode D4 and the capacitor C0 are connected in series between the output terminal of the first boost oscillating module 221a and the negative terminal of the dc power supply 30, the positive terminal of the fourth diode D4 is electrically connected to the output terminal of the first boost oscillating module 221a, the fifth diode D5 is a high voltage trigger diode, the second transformer T2 includes a third primary coil and a second secondary coil, the negative terminal of the fifth diode D5 is connected to the negative terminal of the fourth diode D4, the positive terminal of the fifth diode D5 is connected to one end of the third primary coil, the other end of the third primary coil is connected to the negative terminal of the dc power supply 30, and the second secondary coil is connected to the voltage doubling rectifying circuit 222.

In the embodiment of the present invention, the loop formed by the fourth diode and the capacitor is used for rectifying the first ac voltage into the second dc voltage. The second transformer realizes the boosting function and also has the function of an inductor to realize oscillation. In this embodiment, the fifth diode is a high-voltage trigger diode and plays a role of a switch serving as an oscillation function, the second boost oscillation module converts the rectified second direct-current voltage into an alternating-current voltage through oscillation, the alternating-current voltage is boosted through the second transformer, and the boosted second alternating-current voltage of the second transformer is output to the voltage-multiplying rectification circuit through the second secondary coil.

The voltage-doubling rectifying circuit 222 is a six-time voltage-doubling rectifying circuit, and specifically includes: the high-voltage silicon stack comprises high-voltage silicon stacks HD1, HD2, HD3, HD4, HD5 and HD6, high-voltage capacitors HC1, HC2, HC3, HC4, HC5, HC6 and a fourth resistor R4. One end of the second secondary coil is connected with one end of a high-voltage capacitor HC1, the other end of the second secondary coil is connected with the positive electrode of a high-voltage silicon stack HD1 and one end of a high-voltage capacitor HC4, the other end of HC1 is connected with the negative electrode of the high-voltage silicon stack HD1, the negative electrode of the high-voltage silicon stack HD2 and one end of a high-voltage capacitor CH2, the other end of the high-voltage capacitor HC4 is connected with the positive electrode of the high-voltage silicon stack HD2, the negative electrode of the high-voltage silicon stack HD3 and one end of a high-voltage capacitor CH5, the other end of the high-voltage capacitor CH2 is connected with the positive electrode of the high-voltage silicon stack HD3, the negative electrode of the high-voltage silicon stack HD4 and one end of the high-voltage capacitor CH3, the other end of the high-voltage capacitor HC5 is connected with the positive electrode of the high-voltage silicon stack HD4, the negative electrode HD5 and one end of the high-voltage capacitor CH6, the other end of the high-voltage capacitor CH3 is connected with the positive electrode HD6 of the high-voltage silicon stack HD5 and the fourth resistor 4, the other end of the fourth resistor R4 is connected to the fullerene carbon fiber 24. Through the above circuit, the voltage doubling rectifying circuit 222 rectifies the ac voltage output by the second boost oscillating module 221b into a dc voltage, so that the fullerene carbon fiber filament 24 ionizes air molecules to form negative ions.

In an embodiment of the present invention, the negative ion generating host 22 further includes a protection circuit 223, the protection circuit 223 is connected in series between the positive electrode of the dc power supply 30 and the boost oscillating circuit 221, the protection circuit 223 includes a sixth diode D6 and a third resistor R3, and the positive electrode of the sixth diode D6 is connected to the positive electrode of the dc power supply 30.

In an embodiment of the present invention, the third resistor is used to prevent the element from being burnt out due to the overhigh voltage outputted by the dc power supply. Also, since the first boost oscillating module includes a component having a requirement on polarity, when the polarity of the dc power supply is reversed, the component may be damaged, thereby causing an irreversible loss to the entire circuit. A diode is a device having two electrodes that allows current to flow in only a single direction. The direct-current voltage output by the direct-current power supply passes through the sixth diode and the third resistor and then flows to the first boosting oscillation module, so that the polarity of the voltage flowing into the first boosting oscillation module is ensured to be the same as the polarity allowed by the element, and the element is protected; and the voltage flowing into the first boosting oscillation module is not too large, so that circuit elements are prevented from being burnt, and the circuit is protected.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.

Finally, it is to be noted that: the above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. Conference apparatus, characterized in that it comprises:

the direct current power supply is arranged in the conference equipment body;

2. The conferencing apparatus of claim 1, wherein the negative ion generator further comprises: at least one negative ion guide tube;

3. The conferencing device of claim 2, wherein each of the negative ion guide tubes is made of an insulating material.

4. The conferencing device of claim 1, further comprising: a switch module;

the switch module is connected with the negative ion generation host;

5. The conferencing device of claim 4, further comprising: the system comprises a main control module and a communication module;

6. The conference device according to claim 1, wherein the boost oscillating circuit includes a first boost oscillating module and a second boost oscillating module, the first boost oscillating module, the second boost oscillating module and the voltage-doubling rectifying circuit are sequentially connected, the first boost oscillating module is configured to boost and oscillate a first dc voltage output by the dc power supply and output a first ac voltage to the second boost oscillating module, and the second boost oscillating module is configured to receive the first ac voltage, rectify the first ac voltage into a second dc voltage, and boost and oscillate the second dc voltage to output a second ac voltage to the voltage-doubling rectifying circuit.

7. The conference device according to claim 6, wherein the first boost oscillating module comprises a first resistor, a second resistor, a triode, and a first transformer, the first transformer comprises a first primary coil, a second primary coil, and a first secondary coil, one end of the first resistor is connected to a positive electrode of the DC power supply and one end of the first primary coil, the other end of the first resistor is connected to a base of the triode and a negative electrode of the DC power supply, the other end of the first primary coil is electrically connected to a collector of the triode, an emitter of the triode is connected to a negative electrode of the DC power supply, the second resistor and the second primary coil are connected in series between the base of the triode and the negative electrode of the DC power supply, one end of the first secondary coil is connected to the base of the triode, and the other end of the first secondary coil is connected with the second boosting oscillation module.

8. The conferencing device of claim 7, wherein the first boost oscillating module further comprises a third diode connected in series between the base of the transistor and the negative terminal of the DC power source.

9. The conferencing device of claim 6, wherein the second boost oscillating module comprises a fourth diode, a fifth diode, a capacitor, and a second transformer, the fourth diode and the capacitor are connected in series between the output end of the first boost oscillating module and the negative electrode of the direct current power supply, the anode of the fourth diode is electrically connected with the output end of the first boosting oscillation module, the fifth diode is a high-voltage trigger diode, the second transformer comprises a third primary coil and a second secondary coil, the cathode of the fifth diode is connected with the cathode of the fourth diode, the positive electrode of the fifth diode is connected with one end of the third primary coil, the other end of the third primary coil is connected with the negative electrode of the direct-current power supply, and the second secondary coil is connected with the voltage-multiplying rectifying circuit.

10. The conference device according to any one of claims 1 to 9, wherein the negative ion generation host further comprises a protection circuit, the protection circuit is connected in series between the positive electrode of the dc power supply and the boost oscillating circuit, the protection circuit comprises a sixth diode and a third resistor, and the positive electrode of the sixth diode is connected to the positive electrode of the dc power supply.