CN105356298B - A kind of control method of digitized anion generator - Google Patents

Abstract

The invention discloses the control method of a kind of digitized anion generator, digitized anion generator includes power conversion circuit, master controller, voltage conversion circuit, protection circuit, negative high voltage feedback circuit, A/D change-over circuit, voltage given circuit and drive circuit；Power conversion circuit is made up of LC half-bridge resonance circuit, piezoelectric ceramic transformer and two voltage-multiplying circuits being sequentially connected with；Protection circuit includes current foldback circuit and overheating protection circuit；Negative high voltage feedback circuit is made up of the bleeder circuit being sequentially connected with, half-wave rectifying circuit and voltage limiter circuit；Its method includes step: parameter is arranged, and starts digitized anion generator, signals collecting and storage, crosses and flows judgement, overheated judgement, feedback voltage comparison, and master controller output carries out signals collecting and storage after controlling frequency again.The method step of the present invention is simple, it is achieved convenient, and control accuracy is high, counts new reasonable, and failure rate is low is practical, it is simple to promote the use of.

Description

A kind of control method of digitized anion generator

Present patent application is on 05 29th, 2015 applying date, application number 201510290579.4, and invention and created name is the divisional application of the application for a patent for invention of " a kind of digitized anion generator and control method thereof ".

Technical field

The invention belongs to air purifier technical field, be specifically related to the control method of a kind of digitized anion generator.

Background technology

Along with the reinforcement of the day by day serious of environmental pollution and people's environmental consciousness, air quality oneself become the focus of whole world concern.Especially recently, the PM value that national each big city is announced is all more than 2.0, and even more than 2.5, this will directly threaten our life with healthy.

As the indoor environment that people live, being similarly subject to the impact of atmosphere quality, moreover, be more subject to directly affecting of indoor specific environment, but its pollution factor is more and more inconspicuous, situation also allows of no optimist.Mainly due to a variety of causes, room air pollution causes that room air harmful substance exceeds standard, thus affect human health status, and along with the aggravation of pollution level, people knows from experience generation sub-health state.Furniture problem, architectural problems, decorations problem etc. all have become as three big subject matters of indoor environmental pollution.

Along with the kind of air harmful substance and being continuously increased of quantity, constantly developing and producing air purifier product both at home and abroad, increasing indoor air cleaner product moves towards market, can be divided into according to cleaning principle: mechanical filter formula and adsorption cleaning device, electrostatic purifier, negative ion air-cleaner.Its technical characterstic is as follows:

Mechanical filter formula and absorption type air purifier, be pressurizeed by blower ventilating, and air is successively through filtering material, mainly purify particulate contaminants, clean-up effect determines according to filtering material and the character of design, and certain limitation is very big, it is impossible to thorough filtering noxious chemical substance and bactericidal action.

Electrostatic air cleaner, is that one makes pollutants in air charged by electrostatic, has then adsorbed the dirt in air of charged particle with dust collect plant trapping, reach to purify air purpose.But this depurator not only cost and operating cost is higher also can cause secondary pollution.

Anion generator utilizes the anion self produced to realize the purification to air.The main component of air is nitrogen and oxygen, and usual nitrogen, oxygen molecule electrical property, in neutrality, are with positive and negative electric charge equal.Negative aeroion refers to molecule electronegative in air or atom.But when after the electronics and oxygen molecule combination of air molecule ionization generation, the negative oxygen ion that chemical property is active can be formed.Negative oxygen ion not with other material generation fast reactions before, human body can be acted on by breathing, nerve and blood system, improve pulmonary function, enhance metabolism, strengthen resistance against diseases, improve sleep, kill virus and antibacterial, obtain fresh air, smoke abatement and dust control, improve indoor Air Quality.And its side effect is less, bactericidal effect is obvious, obtains and admits widely.And anion generator common in the market builds composition by analog device, although this kind of anion generator has the advantage that circuit is simple, cheap, but there is also fault rate drift higher, warm and seriously, usually because temperature rise is too high cause the problems such as ion generator inefficacy simultaneously.

Summary of the invention

The technical problem to be solved is in that for above-mentioned deficiency of the prior art, it is provided that the digitized anion generator that a kind of circuit structure is simple, novel in design rationally, functional reliability height, complete function, failure rate is low, maintainability are strong, practical.

For solving above-mentioned technical problem; the technical solution used in the present invention is: a kind of digitized anion generator; it is characterized in that: include the power conversion circuit for the negative direct current high voltage that 24V DC voltage conversion is-6.5kV～-11kV exported by 24V DC source, be used for master controller that power conversion circuit is controlled and be used for the voltage conversion circuit powered for power circuit each in digitized anion generator, and protection circuit and the negative direct current high voltage signal for being exported by described power conversion circuit feed back to the negative high voltage feedback circuit of master controller；Described power conversion circuit is made up of LC half-bridge resonance circuit, piezoelectric ceramic transformer and two voltage-multiplying circuits being sequentially connected with, and described LC half-bridge resonance circuit is connected with the outfan of 24V DC source；Described protection circuit includes being connected with the current signal sampling end of LC half-bridge resonance circuit and for piezoelectric ceramic transformer being crossed current foldback circuit that stream protects and for the overheated overheating protection circuit protected of piezoelectric ceramic transformer；Described negative high voltage feedback circuit is made up of the bleeder circuit being sequentially connected with, half-wave rectifying circuit and voltage limiter circuit, and the input of described bleeder circuit and the outfan of two voltage-multiplying circuits connect；The outfan of described current foldback circuit connects with the input of master controller; the input of described master controller is further connected with A/D change-over circuit; the outfan of described overheating protection circuit and the outfan of voltage limiter circuit are all connected with the input of A/D change-over circuit, and the input of described A/D change-over circuit is further connected with the voltage given circuit of the negative direct current high voltage size for giving the output of described power conversion circuit；The outfan of described master controller is connected to drive circuit, and described LC half-bridge resonance circuit is connected with the outfan of drive circuit；Described voltage conversion circuit includes the 5V voltage conversion circuit for the 24V DC voltage that 24V DC source exports is converted to 5V, for the 5V DC voltage that 5V voltage conversion circuit exports being converted to the 3.3V voltage conversion circuit of 3.3V and being used for being converted to the 3.3V DC voltage that 3.3V voltage conversion circuit exports the 1.5V voltage conversion circuit of 1.5V, described master controller all connects with the outfan of 3.3V voltage conversion circuit and 1.5V voltage conversion circuit, described current foldback circuit, overheating protection circuit, A/D change-over circuit, voltage given circuit and drive circuit all connect with the outfan of 5V voltage conversion circuit.

Above-mentioned a kind of digitized anion generator, it is characterized in that: described LC half-bridge resonance circuit includes NMOS power tube Q3, inductance L1, nonpolar electric capacity C3, nonpolar electric capacity C4 and nonpolar electric capacity C5, the grid of described NMOS power tube Q3 is connected with the outfan of drive circuit by resistance R12, one end of described inductance L1 connects with the outfan of 24V DC source, the source electrode of described NMOS power tube Q3 and the other end of inductance L1, one end of nonpolar electric capacity C3 and one end of nonpolar electric capacity C5 connects and for the outfan of LC half-bridge resonance circuit, the drain electrode of described NMOS power tube Q3 is by resistance R13 ground connection, the described drain electrode of NMOS power tube Q3 and the link of resistance R13 are the current signal sampling end of LC half-bridge resonance circuit, the other end of described nonpolar electric capacity C3 passes through nonpolar electric capacity C4 ground connection, the other end ground connection of described nonpolar electric capacity C5；Described piezoelectric ceramic transformer is multilayer piezoelectric ceramic transformer MPT1, one end of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1 connects with the outfan of LC half-bridge resonance circuit, the other end ground connection of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1, the outfan that one end is piezoelectric ceramic transformer of the secondary piezoelectric oscillator of described multilayer piezoelectric ceramic transformer MPT1；Described two voltage-multiplying circuits are made up of diode D1, diode D2 and nonpolar electric capacity C6, the anode of described diode D1 and the negative electrode of diode D2 all connect with the outfan of piezoelectric ceramic transformer, the minus earth of described diode D1, the outfan that anode is two voltage-multiplying circuits of described diode D2 and by nonpolar electric capacity C6 ground connection.

Above-mentioned a kind of digitized anion generator, it is characterised in that: described master controller is fpga chip EP2C5T144C8N.

Above-mentioned a kind of digitized anion generator, it is characterized in that: described A/D change-over circuit includes modulus conversion chip AD7862, Verf pin and the VDD pin of described modulus conversion chip AD7862 all connect with the outfan of 5V voltage conversion circuit, the DB0 pin of described modulus conversion chip AD7862, DB1 pin, DB2 pin, DB3 pin, DB4 pin, DB5 pin, DB6 pin, DB7 pin, DB8 pin, DB9 pin, DB10 pin and DB11 pin are corresponding in turn to the 94th pin with fpga chip EP2C5T144C8N, 93rd pin, 92nd pin, 87th pin, 86th pin, 81st pin, 80th pin, 79th pin, 76th pin, 75th pin, 74th pin and the 73rd pin connect, described modulus conversion chip AD7862'sPin, BUSY pin, RD pin, CS pin and A0 pin are corresponding in turn to the 4th pin with fpga chip EP2C5T144C8N, the 3rd pin, the 7th pin, the 8th pin and the 24th pin and connect; the VB1 pin of described modulus conversion chip AD7862 connects with the outfan of voltage limiter circuit and by nonpolar electric capacity C1 ground connection; the VA1 pin of described modulus conversion chip AD7862 connects with the outfan of overheating protection circuit, and the VB2 pin of described modulus conversion chip AD7862 connects with the outfan of voltage given circuit；Described voltage given circuit is made up of slide rheostat VR1 and nonpolar electric capacity C2, the outfan of the one termination 5V voltage conversion circuit of described slide rheostat VR1, the other end ground connection of described slide rheostat VR1, the outfan that sliding end is voltage given circuit of described slide rheostat VR1, and by nonpolar electric capacity C2 ground connection.

Above-mentioned a kind of digitized anion generator, it is characterised in that: described drive circuit is made up of symmetrical audion Q1, audion Q2, resistance R1 and resistance R2, described symmetrical audion Q1 by audion Q1-1 in NPN type and under positive-negative-positive audion Q1-2 form；The input that base stage is drive circuit of described audion Q2 and connecting with the 9th pin of fpga chip EP2C5T144C8N, the colelctor electrode of described audion Q2, in NPN type audion Q1-1 base stage and under positive-negative-positive the base stage of audion Q1-2 connect each through the outfan of resistance R2 and 5V voltage conversion circuit, in described NPN type, the colelctor electrode of audion Q1-1 is connected by the outfan of resistance R1 and 5V voltage conversion circuit, the equal ground connection of colelctor electrode of audion Q1-2 under the emitter stage of described audion Q2 and positive-negative-positive, in described NPN type audion Q1-1 emitter stage and under positive-negative-positive the emitter stage of audion Q1-2 connect and for the outfan of drive circuit.

Above-mentioned a kind of digitized anion generator, it is characterised in that: described bleeder circuit is made up of the resistance R16 connected and resistance R17, the input that one end is bleeder circuit after described resistance R16 and resistance R17 series connection, other end ground connection；Described half-wave rectifying circuit is made up of diode D5, diode D6 and nonpolar electric capacity C13, the anode of described diode D5 and the negative electrode of diode D6 all connect with the link of resistance R16 and resistance R17, the anode of described diode D6 and the equal ground connection of the other end of nonpolar electric capacity C13；Described voltage limiter circuit is made up of Zener diode DZ3, and the negative electrode of described Zener diode DZ3 connects with the negative electrode of diode D5 and for the outfan of voltage limiter circuit, the plus earth of described Zener diode DZ3.

Above-mentioned a kind of digitized anion generator, it is characterized in that: described current foldback circuit includes comparator U8B, audion Q1, the reference voltage circuit connected with the in-phase input end of comparator U8B and the signals collecting amplifying circuit connected with the inverting input of comparator U8B, described reference voltage circuit is by resistance R19, resistance R20, Zener diode DZ4 and nonpolar electric capacity C14 composition, one end after described resistance R19 and resistance R20 series connection connects with the outfan of 5V voltage conversion circuit, other end ground connection, the reference voltage output terminal that link is reference voltage circuit of described resistance R19 and resistance R20, the negative electrode of described Zener diode DZ4 and one end of nonpolar electric capacity C14 all connect with the outfan of 5V voltage conversion circuit, the anode of described Zener diode DZ4 and the equal ground connection of the other end of nonpolar electric capacity C14；Described signals collecting amplifying circuit is made up of operational amplifier U8A, resistance R21, resistance R22 and nonpolar electric capacity C15, the in-phase input end of described operational amplifier U8A is current signal input and the current signal sampling end with LC half-bridge resonance circuit connects, the inverting input of described operational amplifier U8A passes through resistance R22 ground connection, described resistance R21 and nonpolar electric capacity C15 is connected in parallel between inverting input and the outfan of operational amplifier U8A, the outfan that outfan is signals collecting amplifying circuit of described operational amplifier U8A；The base stage of described audion Q1 connects with the outfan of comparator U8B, the grounded collector of described audion Q1, the outfan of the transmitting extremely current foldback circuit of described audion Q1 and being connected by the outfan of resistance R18 and 5V voltage conversion circuit；Described overheating protection circuit is made up of temperature sensor MCP9701.

Above-mentioned a kind of digitized anion generator, it is characterized in that: described 5V voltage conversion circuit includes step-down switching regulator MCP16301, switching diode D3, switching diode D4, Zener diode DZ1, Zener diode DZ2 and inductance L2,4th pin of described step-down switching regulator MCP16301 and the 5th pin connect each through the negative electrode insuring F1 and switching diode D3, and by polar capacitor C7 ground connection；The anode of described switching diode D3 and the negative electrode of Zener diode DZ1 all connect with the outfan of 24V DC source, the plus earth of described Zener diode DZ1,1st pin of described step-down switching regulator MCP16301 connects with the negative electrode of switching diode D4, and connected by the negative electrode of nonpolar electric capacity C12 and Zener diode DZ2 and one end of inductance L2, the plus earth of described Zener diode DZ2, the anode of described switching diode D4 and the other end of inductance L2 connects and for the outfan of 5V voltage conversion circuit, and by polar capacitor C8 ground connection；Being connected to the resistance R14 and resistance R15 that connect between outfan and the ground of described 5V voltage conversion circuit, the 3rd pin of described step-down switching regulator MCP16301 connects with the link of resistance R14 and resistance R15；Described 3.3V voltage conversion circuit includes chip AMS1117-3.3V, 3rd pin of described chip AMS1117-3.3V connects with the outfan of 5V voltage conversion circuit, and by polar capacitor C9 ground connection, the 1st pin ground connection of described chip AMS1117-3.3V, the outfan that 2nd pin is 3.3V voltage conversion circuit of described chip AMS1117-3.3V, and by polar capacitor C10 ground connection；Described 1.5V voltage conversion circuit includes chip AMS1117-1.5V, 3rd pin of described chip AMS1117-1.5V connects with the outfan of 3.3V voltage conversion circuit, the 1st pin ground connection of described chip AMS1117-1.5V, the outfan that 2nd pin is 1.5V voltage conversion circuit of described chip AMS1117-1.5V, and by polar capacitor C11 ground connection.

Present invention also offers the control method that a kind of method step is simple, realize the digitized anion generator convenient, control accuracy is high, it is characterised in that the method comprises the following steps:

Step one, parameter are arranged: stored in the host controller by the relation table of the voltage of frequency and the digitized anion generator output of the master controller output measured in advance, and set the master controller frequency to its output and carry out the Proportional coefficient K of PID control_p, integral coefficient K_i, differential coefficient K_dWith voltage deviation threshold M, and the current setting value I of piezoelectric ceramic transformer_s, piezoelectric ceramic transformer desired temperature T_sDeviation delta U upper and lower with voltage, and storage is in the host controller；

Step 2, startup digitized anion generator: operation voltage given circuit, input voltage setting value U_sTo master controller, the frequency of the master controller output that master controller inquiry is stored therein and the relation table of the voltage of digitized anion generator output, find voltage setting value U_sThe frequency f of corresponding master controller output, and output frequency f is to drive circuit, drive circuit drives the work of LC half-bridge resonance circuit, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer transformation, two voltage-multiplying circuit multiplication of voltages；And, master controller is always according to formula U_max=U_s+ Δ U calculates and obtains upper voltage limit value U_maxAnd store, always according to U_min=U_s-Δ U calculates and obtains voltage lower limit value U_minAnd store；

Step 3, signals collecting and storage: the temperature of piezoelectric ceramic transformer is carried out detection in real time and exports to A/D change-over circuit by the signal detected by described overheating protection circuit, simultaneously, the current signal of LC half-bridge resonance circuit is carried out detection in real time and exports to master controller by the signal detected by described current foldback circuit, the negative direct current high voltage signal that described power conversion circuit is exported by described negative high voltage feedback circuit carries out detection in real time and exports to A/D change-over circuit by the signal detected, described master controller is sampled by the current signal of the cycle t LC half-bridge resonance circuit that current foldback circuit is detected, and sample by the negative direct current high voltage feedback signal of the cycle t temperature signal and the output of described power conversion circuit that A/D change-over circuit carried out the piezoelectric ceramic transformer that analog digital conversion obtains, and the negative direct current high voltage feedback signal and the negative direct current high voltage feedback signal that currently power conversion circuit described in a front sampling instant exports to power conversion circuit output described in current sample time stores；Wherein current sample time is designated as kth sampling instant, the negative direct current high voltage feedback signal of power conversion circuit output described in current sample time is designated as U (k), a currently front sampling instant is designated as-1 sampling instant of kth, by described in a currently front sampling instant power conversion circuit output negative direct current high voltage feedback signal be designated as U (k-1), k be not less than 2 positive integer；

Step 4, mistake flow judgement: described master controller compares current signal I (k) and the current setting value I of kth sampling instant LC half-bridge resonance circuit_s, as I (k)≤I_sTime, perform step 5；Otherwise, as I (k) > I_sTime, master controller output frequency f (k)=0；It is then back to step 3；

Step 5, overheated judgement: described master controller compares temperature signal T (k) and the desired temperature T of kth sampling instant piezoelectric ceramic transformer_s, as T (k)≤T_sTime, perform step 6；Otherwise, as T (k) > T_sTime, master controller output frequency f (k)=0；It is then back to step 3；

Step 6, feedback voltage comparison: first, described master controller compares negative direct current high voltage feedback signal U (k) of power conversion circuit output described in current sample time and the negative direct current high voltage feedback signal U (k-1) of power conversion circuit output described in a currently front sampling instant, obtains feedback voltage deviation e (k)=U (the k)-U (k-1) of current sample time and a currently front sampling instant；Then, described master controller compares negative direct current high voltage feedback signal U (k) and the upper voltage limit value U of power conversion circuit output described in current sample time_max, as U (k) >=U_maxTime, then compare feedback voltage deviation e (k) of current sample time and a currently front sampling instant and voltage deviation threshold value M, when | e (k) | is during≤M, perform step 7, when | e (k) | is during >=M, perform step 8；Otherwise, as U (k) < U_maxTime, then compare feedback voltage deviation e (k) and the voltage lower limit value U of current sample time and a currently front sampling instant_min, as U (k) > and U_minTime, perform step 7, as U (k)≤U_minTime, then compare feedback voltage deviation e (k) and the voltage deviation threshold value M of current sample time and a current front sampling instant, when | e (k) | is during>=M, perform step 8, when | e (k) |<during M, performs step 7；

Step 7, master controller output frequency f (k)=f (k-1), is then back to step 3；Wherein, f (k-1) is the frequency of master controller currently front sampling instant output；

Step 8, master controller output frequency f (k)=f (k-1)+C₀e(k)+C₁e(k-1)+C₂E (k-2)；It is then back to step 3；Wherein, C₀For scaling referring factor and C₀=1.2K_p+K_i+K_d, C₁Referring factor and C is amplified for integration₁=-(K_p+2K_d), C₂Referring factor and C is amplified for differential₂=K_d；E (k-1) is feedback voltage deviation and the e (1)=0 in a currently front sampling instant and current front double sampling moment, when k >=3, e (k-1)=U (k-1)-U (k-2), U (k-2) are the negative direct current high voltage feedback signal of power conversion circuit output described in the current front double sampling moment；E (k-2) is feedback voltage deviation and e (the 0)=e (1)=0 of current front double sampling moment and current first three sampling instant, when k >=4, e (k-2)=U (k-2)-U (k-3), U (k-3) are the negative direct current high voltage feedback signal of power conversion circuit output described in current first three sampling instant.

The control method of above-mentioned a kind of digitized anion generator, it is characterised in that: the detailed process of the frequency and the relation table of the voltage of digitized anion generator output that measure master controller output described in step one in advance is:

The frequency f of step 101, described master controller output starts to change in the way of 0.1Hz is incremented by from 65Hz in the scope of 65Hz～75Hz, output frequency f is to drive circuit, drive circuit drives the work of LC half-bridge resonance circuit, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer transformation, two voltage-multiplying circuit multiplication of voltages；

The negative direct current high voltage signal that two voltage-multiplying circuits are exported by step 102, described negative high voltage feedback circuit carries out detection in real time and exports to A/D change-over circuit by the signal detected, A/D change-over circuit exports after signal is carried out A/D conversion to master controller, and master controller analyzing and processing obtains the voltage of digitized anion generator output；

The relation table of the voltage that the frequency f of step 103, described master controller record master controller output exports with digitized anion generator.

The present invention compared with prior art has the advantage that

1, the circuit structure of digitized anion generator of the present invention is simple, novel in design reasonable, it is achieved convenient.

2, the digitized anion generator of the present invention, utilize piezoelectric ceramic transformer as main power inverter, it has the advantages such as drive circuit is simple, volume is little, electromagnetic-radiation-free, the circuit structure overcoming current wire-wound transformers anion generator is more complicated, require that stages is more, communication, domestic circuit also can be produced interference, be afraid of short circuit by high-frequency oscillating circuits, dangerous, unstable, also can cause the shortcomings such as burning.

3, the present invention adopts FPGA (field programmable gate array) chip as essential core control unit, has and programs simple, the simple advantage of peripheral circuit.

4, the functional reliability of the present invention is high, and complete function has overheated, overcurrent protection function, it is ensured that the reliability of ion generator and ruggedness.

5, digital incremental PID Closed loop Control has been applied in anion generator by the present invention, error need not be added up by the method in processing procedure, have that operand is little, the feature of fast response time, can effectively avoid the generation of out-of-control phenomenon, achieve fast-response and the dynamic stability of anion generator, achieve the Based Intelligent Control of anion generator, overcome traditional analog anion generator to be difficult to debug, the shortcoming that concordance is poor, fault rate is high, improves the production efficiency of anion generator.

6, the method step of the control method of digitized anion generator of the present invention is simple, it is achieved convenient, and control accuracy is high.

7, the present invention's is maintainable strong, it is possible to be applied to hotel, at home, office, the place such as hospital, beautify the environment, purify air, practical, it is simple to promote the use of.

In sum, the present invention is novel in design rationally, and functional reliability is high, complete function, failure rate is low, maintainable strong, practical, it is simple to promote the use of.

Below by drawings and Examples, technical scheme is described in further detail.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of digitized anion generator of the present invention.

Fig. 2 is the circuit theory diagrams of power conversion circuit of the present invention.

Fig. 3 is the circuit connection diagram of master controller of the present invention, A/D change-over circuit, voltage given circuit and drive circuit.

Fig. 4 is the circuit theory diagrams of negative high voltage feedback circuit of the present invention.

Fig. 5 is the circuit theory diagrams of current foldback circuit of the present invention.

Fig. 6 is the circuit theory diagrams of voltage conversion circuit of the present invention.

Fig. 7 is the method flow block diagram of the control method of digitized anion generator of the present invention.

Description of reference numerals:

1 master controller；2 LC half-bridge resonance circuit；3 piezoelectric ceramic transformers；

4 two voltage-multiplying circuits；5 current foldback circuits；6 overheating protection circuits；

7 bleeder circuits；8 half-wave rectifying circuits；9 voltage limiter circuits；

10 A/D change-over circuits；11 voltage given circuits；12 drive circuits；

13 5V voltage conversion circuits；14 5V voltage conversion circuits；

15 1.5V voltage conversion circuits；16 24V DC sources.

Detailed description of the invention

As shown in Figure 1; the digitized anion generator of the present invention; including the negative direct current high voltage that 24V DC voltage conversion is-6.5kV～-11kV for 24V DC source 16 is exported power conversion circuit, be used for master controller 1 that power conversion circuit is controlled and be used for the voltage conversion circuit powered for power circuit each in digitized anion generator, and protection circuit and the negative direct current high voltage signal for being exported by described power conversion circuit feed back to the negative high voltage feedback circuit of master controller 1；Described power conversion circuit is made up of the LC half-bridge resonance circuit 2 being sequentially connected with, piezoelectric ceramic transformer 3 and two voltage-multiplying circuits 4, and described LC half-bridge resonance circuit 2 is connected with the outfan DV24V of 24V DC source 16；Described protection circuit includes being connected with the current signal sampling end of LC half-bridge resonance circuit 2 and for the current foldback circuit 5 that piezoelectric ceramic transformer 3 mistake stream is protected with for the overheated overheating protection circuit 6 protected of piezoelectric ceramic transformer 3；Described negative high voltage feedback circuit is made up of the bleeder circuit 7 being sequentially connected with, half-wave rectifying circuit 8 and voltage limiter circuit 9, and the input of described bleeder circuit 7 and the outfan of two voltage-multiplying circuits 4 connect；The outfan of described current foldback circuit 5 connects with the input of master controller 1; the input of described master controller 1 is further connected with A/D change-over circuit 10; the outfan of described overheating protection circuit 6 and the outfan of voltage limiter circuit 9 are all connected with the input of A/D change-over circuit 10, and the input of described A/D change-over circuit 10 is further connected with the voltage given circuit 11 of the negative direct current high voltage size for giving the output of described power conversion circuit；The outfan of described master controller 1 is connected to drive circuit 12, and described LC half-bridge resonance circuit 2 is connected with the outfan of drive circuit 12；Described voltage conversion circuit includes the 24V DC voltage for being exported by 24V DC source 16 and is converted to the 5V voltage conversion circuit 13 of 5V, 3.3V voltage conversion circuit 14 that 5V DC voltage for being exported by 5V voltage conversion circuit 13 is converted to 3.3V and the 3.3V DC voltage being used for being exported by 3.3V voltage conversion circuit 14 are converted to the 1.5V voltage conversion circuit 15 of 1.5V, described master controller 1 all connects with the outfan of 3.3V voltage conversion circuit 14 and 1.5V voltage conversion circuit 15, described current foldback circuit 5, overheating protection circuit 6, A/D change-over circuit 10, voltage given circuit 11 and drive circuit 12 all connect with the outfan of 5V voltage conversion circuit 13.

As shown in Figure 2, in the present embodiment, described LC half-bridge resonance circuit 2 includes NMOS power tube Q3, inductance L1, nonpolar electric capacity C3, nonpolar electric capacity C4 and nonpolar electric capacity C5, the grid of described NMOS power tube Q3 is connected with the outfan PFM of drive circuit 12 by resistance R12, one end of described inductance L1 connects with the outfan DV24V of 24V DC source 16, the source electrode of described NMOS power tube Q3 and the other end of inductance L1, one end of nonpolar electric capacity C3 and one end of nonpolar electric capacity C5 connects and for the outfan of LC half-bridge resonance circuit 2, the drain electrode of described NMOS power tube Q3 is by resistance R13 ground connection, the described drain electrode of NMOS power tube Q3 and the link of resistance R13 are the current signal sampling end CUR_FB of LC half-bridge resonance circuit 2, the other end of described nonpolar electric capacity C3 passes through nonpolar electric capacity C4 ground connection, the other end ground connection of described nonpolar electric capacity C5；The signal that drives of fpga chip EP2C5T144C8N output controls conducting and the pass section of NMOS power tube Q3 after overdrive circuit 12 carries out power amplification, when the driving signal of fpga chip EP2C5T144C8N output is high level, drive circuit 12 output low level, NMOS power tube Q3 turns on；When the driving signal of fpga chip EP2C5T144C8N output is low level, drive circuit 12 exports high level, and NMOS power tube Q3 turns off, so that LC half-bridge resonance circuit 2 export resonance signal.

As shown in Figure 2, in the present embodiment, described piezoelectric ceramic transformer 3 is multilayer piezoelectric ceramic transformer MPT1, one end of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1 connects with the outfan of LC half-bridge resonance circuit 2, the other end ground connection of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1, the outfan that one end is piezoelectric ceramic transformer 3 of the secondary piezoelectric oscillator of described multilayer piezoelectric ceramic transformer MPT1；Described piezoelectric ceramic transformer 3 is for carrying out power amplification to the resonance signal of LC half-bridge resonance circuit 2 output.

As shown in Figure 2, in the present embodiment, described two voltage-multiplying circuits 4 are made up of diode D1, diode D2 and nonpolar electric capacity C6, the anode of described diode D1 and the negative electrode of diode D2 all connect with the outfan of piezoelectric ceramic transformer 3, the minus earth of described diode D1, the anode of described diode D2 is the outfan HV of two voltage-multiplying circuits 4 and passes through nonpolar electric capacity C6 ground connection.The outfan HV of described two voltage-multiplying circuits 4 is the outfan of described power conversion circuit, and the outfan of described power conversion circuit is the-6.5kV～-11kV negative direct current high voltage outfan of this digitized anion generator.

As it is shown on figure 3, in the present embodiment, described master controller 1 is fpga chip EP2C5T144C8N.

As shown in Figure 3, in the present embodiment, described A/D change-over circuit 10 includes modulus conversion chip AD7862, the Verf pin of described modulus conversion chip AD7862 and VDD pin all connect with the outfan DC5V of 5V voltage conversion circuit 13, the DB0 pin of described modulus conversion chip AD7862, DB1 pin, DB2 pin, DB3 pin, DB4 pin, DB5 pin, DB6 pin, DB7 pin, DB8 pin, DB9 pin, DB10 pin and DB11 pin are corresponding in turn to the 94th pin with fpga chip EP2C5T144C8N, 93rd pin, 92nd pin, 87th pin, 86th pin, 81st pin, 80th pin, 79th pin, 76th pin, 75th pin, 74th pin and the 73rd pin connect, described modulus conversion chip AD7862'sPin, BUSY pin, RD pin, CS pin and A0 pin are corresponding in turn to the 4th pin with fpga chip EP2C5T144C8N, the 3rd pin, the 7th pin, the 8th pin and the 24th pin and connect; the VB1 pin of described modulus conversion chip AD7862 connects with the outfan FB of voltage limiter circuit 9 and by nonpolar electric capacity C1 ground connection; the VA1 pin of described modulus conversion chip AD7862 connects with the outfan OTP of overheating protection circuit 6, and the VB2 pin of described modulus conversion chip AD7862 connects with the output terminals A DJ of voltage given circuit 11；Described voltage given circuit 11 is made up of slide rheostat VR1 and nonpolar electric capacity C2, the outfan of the one termination 5V voltage conversion circuit 13 of described slide rheostat VR1, the other end ground connection of described slide rheostat VR1, the output terminals A DJ that sliding end is voltage given circuit 11 of described slide rheostat VR1, and by nonpolar electric capacity C2 ground connection.A/D change-over circuit 10 exports to fpga chip EP2C5T144C8N after carrying out A/D conversion for the signal that overheating protection circuit 6 and voltage limiter circuit 9 are exported.

As it is shown on figure 3, in the present embodiment, described drive circuit 12 is made up of symmetrical audion Q1, audion Q2, resistance R1 and resistance R2, described symmetrical audion Q1 by audion Q1-1 in NPN type and under positive-negative-positive audion Q1-2 form；The input that base stage is drive circuit 12 of described audion Q2 and connecting with the 9th pin of fpga chip EP2C5T144C8N, the colelctor electrode of described audion Q2, in NPN type audion Q1-1 base stage and under positive-negative-positive the base stage of audion Q1-2 connect each through the outfan DC5V of resistance R2 and 5V voltage conversion circuit 13, in described NPN type, the colelctor electrode of audion Q1-1 is connected by the outfan DC5V of resistance R1 and 5V voltage conversion circuit 13, the equal ground connection of colelctor electrode of audion Q1-2 under the emitter stage of described audion Q2 and positive-negative-positive, in described NPN type audion Q1-1 emitter stage and under positive-negative-positive the emitter stage of audion Q1-2 connect and for the outfan PFM of drive circuit 12.Described drive circuit 12 has been mainly used in the power amplification driving signal to fpga chip EP2C5T144C8N output, the signal that drives of fpga chip EP2C5T144C8N output passes through the on-off action of audion Q2, colelctor electrode output switch pulse signal at audion Q2, the symmetrical audion Q1's of driving is open-minded, thus the driving signal after output amplification is to power conversion circuit, specifically, when the driving signal of fpga chip EP2C5T144C8N output is high level, audion Q2 turns on, audion Q1-1 cut-off in NPN type in symmetrical audion Q1, audion Q1-2 conducting under positive-negative-positive, the outfan of drive circuit 12 is output as low level；When the driving signal of fpga chip EP2C5T144C8N output is low level, audion Q2 ends, and audion Q1-1 conducting in the NPN type in symmetrical audion Q1, audion Q1-2 cut-off under positive-negative-positive, the outfan of drive circuit 12 is output as high level.

As shown in Figure 4, in the present embodiment, described bleeder circuit 7 is made up of the resistance R16 connected and resistance R17, the input HV_FB that one end is bleeder circuit 7 after described resistance R16 and resistance R17 series connection, other end ground connection；Described half-wave rectifying circuit 8 is made up of diode D5, diode D6 and nonpolar electric capacity C13, the anode of described diode D5 and the negative electrode of diode D6 all connect with the link of resistance R16 and resistance R17, the anode of described diode D6 and the equal ground connection of the other end of nonpolar electric capacity C13；Described voltage limiter circuit 9 is made up of Zener diode DZ3, and the negative electrode of described Zener diode DZ3 connects with the negative electrode of diode D5 and for the outfan FB of voltage limiter circuit 9, the plus earth of described Zener diode DZ3.Export to half-wave rectifying circuit 8 after the signal dividing potential drop that two voltage-multiplying circuits 4 are exported by described bleeder circuit 7, halfwave rectifier is become the direct current of pulsation by half-wave rectifying circuit 8, amplitude limit then through Zener diode DZ3, preventing output feedack overtension from damaging master controller 1, the negative high voltage feedback signal after amplitude limit exports to A/D change-over circuit 10.

As shown in Figure 5, in the present embodiment, described current foldback circuit 5 includes comparator U8B, audion Q1, the reference voltage circuit connected with the in-phase input end of comparator U8B and the signals collecting amplifying circuit connected with the inverting input of comparator U8B, described reference voltage circuit is by resistance R19, resistance R20, Zener diode DZ4 and nonpolar electric capacity C14 composition, one end after described resistance R19 and resistance R20 series connection connects with the outfan DC5V of 5V voltage conversion circuit 13, other end ground connection, the reference voltage output terminal that link is reference voltage circuit of described resistance R19 and resistance R20, the negative electrode of described Zener diode DZ4 and one end of nonpolar electric capacity C14 all connect with the outfan DC5V of 5V voltage conversion circuit 13, the anode of described Zener diode DZ4 and the equal ground connection of the other end of nonpolar electric capacity C14；Described signals collecting amplifying circuit is made up of operational amplifier U8A, resistance R21, resistance R22 and nonpolar electric capacity C15, the in-phase input end of described operational amplifier U8A is current signal input and connects with the current signal sampling end CUR_FB of LC half-bridge resonance circuit 2, the inverting input of described operational amplifier U8A passes through resistance R22 ground connection, described resistance R21 and nonpolar electric capacity C15 is connected in parallel between inverting input and the outfan of operational amplifier U8A, the outfan that outfan is signals collecting amplifying circuit of described operational amplifier U8A；The base stage of described audion Q1 connects with the outfan of comparator U8B; the grounded collector of described audion Q1, the outfan OCP of the transmitting of described audion Q1 extremely current foldback circuit 5 and being connected by the outfan DC5V of resistance R18 and 5V voltage conversion circuit 13；When being embodied as, the 2nd pin of the outfan OCP and fpga chip EP2C5T144C8N of described current foldback circuit 5 connects；Signal after linear amplification, for the voltage at the resistance R13 two ends from LC half-bridge resonance circuit 2 is acquired and linear amplification, is re-fed into the inverting input of comparator U8B by described signals collecting amplifying circuit；Reference voltage signal is sent into the in-phase input end of comparator U8B by described reference voltage circuit; when the voltage at resistance R13 two ends is more than reference voltage; comparator U8B is output as low level, now audion Q1 conducting, and current foldback circuit 5 output low level is to master controller 1；

In the present embodiment, described overheating protection circuit 6 is made up of temperature sensor MCP9701.Temperature sensor MCP9701 is linear temperature element, and its power supply voltage range is 3.1V～5.5V, and temperature measurement range is-40 DEG C～125 DEG C, it is not necessary to other external devices, just the detection of energy complete independently temperature.The outfan of described temperature sensor MCP9701 is the outfan OTP of overheating protection circuit 6.

As shown in Figure 6, in the present embodiment, described 5V voltage conversion circuit 13 includes step-down switching regulator MCP16301, switching diode D3, switching diode D4, Zener diode DZ1, Zener diode DZ2 and inductance L2,4th pin of described step-down switching regulator MCP16301 and the 5th pin connect each through the negative electrode insuring F1 and switching diode D3, and by polar capacitor C7 ground connection；The anode of described switching diode D3 and the negative electrode of Zener diode DZ1 all connect with the outfan DV24V of 24V DC source 16, the plus earth of described Zener diode DZ1, 1st pin of described step-down switching regulator MCP16301 connects with the negative electrode of switching diode D4, and connected by the negative electrode of nonpolar electric capacity C12 and Zener diode DZ2 and one end of inductance L2, the plus earth of described Zener diode DZ2, the anode of described switching diode D4 and the other end of inductance L2 connects and for the outfan DC5V of 5V voltage conversion circuit 13, and by polar capacitor C8 ground connection；Being connected to the resistance R14 and resistance R15 that connect between outfan DC5V and the ground of described 5V voltage conversion circuit 13, the 3rd pin of described step-down switching regulator MCP16301 connects with the link of resistance R14 and resistance R15；When being embodied as, the 2nd pin ground connection of described step-down switching regulator MCP16301；The operation principle of described 5V voltage conversion circuit 13 is: when the 4th pin input voltage of step-down switching regulator MCP16301 is higher than 3.5V, step-down switching regulator MCP16301 starts working, the internal built-in low resistance N-channel MOS FET of step-down switching regulator MCP16301, when low resistance N-channel MOS FET disconnects, inductance L2 gives nonpolar electric capacity C12 charging through switching diode D4, making the grid voltage of low resistance N-channel MOS FET higher than drain voltage, low resistance N-channel MOS FET is only possible to conducting；Concrete voltage-regulation process is when output feedack voltage sends into the 3rd pin of step-down switching regulator MCP16301 by resistance R14 and resistance R15, when the 3rd pin voltage of step-down switching regulator MCP16301 is lower than 0.8V, low resistance N-channel MOS FET closes, inductive current increases, and output voltage increases；When the 3rd pin voltage of step-down switching regulator MCP16301 is higher than 0.8V, low resistance N-channel MOS FET opens, and inductive current reduces, and output voltage reduces, it is achieved that voltage stabilizing.

As shown in Figure 6, in the present embodiment, described 3.3V voltage conversion circuit 14 includes chip AMS1117-3.3V, 3rd pin of described chip AMS1117-3.3V connects with the outfan DC5V of 5V voltage conversion circuit 13, and by polar capacitor C9 ground connection, the 1st pin ground connection of described chip AMS1117-3.3V, the outfan DC3.3V that the 2nd pin is 3.3V voltage conversion circuit 14 of described chip AMS1117-3.3V, and by polar capacitor C10 ground connection；

As shown in Figure 6, in the present embodiment, described 1.5V voltage conversion circuit 15 includes chip AMS1117-1.5V, 3rd pin of described chip AMS1117-1.5V connects with the outfan DC3.3V of 3.3V voltage conversion circuit 14, the 1st pin ground connection of described chip AMS1117-1.5V, the outfan DC1.5V that 2nd pin is 1.5V voltage conversion circuit 15 of described chip AMS1117-1.5V, and by polar capacitor C11 ground connection.

As it is shown in fig. 7, the control method of the digitized anion generator of the present invention, comprise the following steps:

Step one, parameter are arranged: the relation table of the voltage of the frequency exported by the master controller 1 measured in advance and digitized anion generator output is stored in master controller 1, and set the master controller 1 frequency to its output and carry out the Proportional coefficient K of PID control_p, integral coefficient K_i, differential coefficient K_dWith voltage deviation threshold value M, and the current setting value I of piezoelectric ceramic transformer 3_s, piezoelectric ceramic transformer 3 desired temperature T_sDeviation delta U upper and lower with voltage, and be stored in master controller 1；When being embodied as, the value of described Δ U is 0.1kV；

In the present embodiment, the detailed process of the frequency and the relation table of the voltage of digitized anion generator output that measure master controller 1 output described in step one in advance is:

The frequency f of step 101, described master controller 1 output starts to change in the way of 0.1Hz is incremented by from 65Hz in the scope of 65Hz～75Hz, output frequency f is to drive circuit 12, drive circuit 12 drives LC half-bridge resonance circuit 2 to work, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer 3 transformation, two voltage-multiplying circuit 4 multiplication of voltages；

The negative direct current high voltage signal that two voltage-multiplying circuits 4 export is carried out detection in real time and exports to A/D change-over circuit 10 by the signal detected by step 102, described negative high voltage feedback circuit, A/D change-over circuit 10 exports after signal is carried out A/D conversion to master controller 1, and master controller 1 analyzing and processing obtains the voltage of digitized anion generator output；

Step 103, described master controller 1 record the frequency f of master controller 1 output and the relation table of the voltage of digitized anion generator output.

Step 2, startup digitized anion generator: operation voltage given circuit 11, input voltage setting value U_sTo master controller 1, the frequency of master controller 1 output that master controller 1 inquiry is stored therein and the relation table of the voltage of digitized anion generator output, find voltage setting value U_sThe frequency f of corresponding master controller 1 output, and output frequency f is to drive circuit 12, drive circuit 12 drives LC half-bridge resonance circuit 2 to work, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer 3 transformation, two voltage-multiplying circuit 4 multiplication of voltages；And, master controller 1 is always according to formula U_max=U_s+ Δ U calculates and obtains upper voltage limit value U_maxAnd store, always according to U_min=U_s-Δ U calculates and obtains voltage lower limit value U_minAnd store；

Step 3, signals collecting and storage: the temperature of piezoelectric ceramic transformer 3 is carried out detection in real time and exports to A/D change-over circuit 10 by the signal detected by described overheating protection circuit 6, simultaneously, the current signal of LC half-bridge resonance circuit 2 is carried out detection in real time and exports to master controller 1 by the signal detected by described current foldback circuit 5, the negative direct current high voltage signal that described power conversion circuit is exported by described negative high voltage feedback circuit carries out detection in real time and exports to A/D change-over circuit 10 by the signal detected, described master controller 1 is sampled by the current signal of the cycle t LC half-bridge resonance circuit 2 that current foldback circuit 5 is detected, and sample by the negative direct current high voltage feedback signal of the cycle t temperature signal and the output of described power conversion circuit that A/D change-over circuit 10 carried out the piezoelectric ceramic transformer 3 that analog digital conversion obtains, and the negative direct current high voltage feedback signal and the negative direct current high voltage feedback signal that currently power conversion circuit described in a front sampling instant exports to power conversion circuit output described in current sample time stores；Wherein current sample time is designated as kth sampling instant, the negative direct current high voltage feedback signal of power conversion circuit output described in current sample time is designated as U (k), a currently front sampling instant is designated as-1 sampling instant of kth, by described in a currently front sampling instant power conversion circuit output negative direct current high voltage feedback signal be designated as U (k-1), k be not less than 2 positive integer；When being embodied as, the value of described cycle t is 100us～1ms；

Step 4, mistake flow judgement: described master controller 1 compares current signal I (k) and the current setting value I of kth sampling instant LC half-bridge resonance circuit 2_s, as I (k)≤I_sTime, perform step 5；Otherwise, as I (k) > I_sTime, master controller 1 output frequency f (k)=0；It is then back to step 3；

Step 5, overheated judgement: described master controller 1 compares temperature signal T (k) and the desired temperature T of kth sampling instant piezoelectric ceramic transformer 3_s, as T (k)≤T_sTime, perform step 6；Otherwise, as T (k) > T_sTime, master controller 1 output frequency f (k)=0；It is then back to step 3；

Step 6, feedback voltage comparison: first, described master controller 1 compares negative direct current high voltage feedback signal U (k) of power conversion circuit output described in current sample time and the negative direct current high voltage feedback signal U (k-1) of power conversion circuit output described in a currently front sampling instant, obtains feedback voltage deviation e (k)=U (the k)-U (k-1) of current sample time and a currently front sampling instant；Then, described master controller 1 compares negative direct current high voltage feedback signal U (k) and the upper voltage limit value U of power conversion circuit output described in current sample time_max, as U (k) >=U_maxTime, then compare feedback voltage deviation e (k) of current sample time and a currently front sampling instant and voltage deviation threshold value M, when | e (k) | is during≤M, perform step 7, when | e (k) | is during >=M, perform step 8；Otherwise, as U (k) < U_maxTime, then compare feedback voltage deviation e (k) and the voltage lower limit value U of current sample time and a currently front sampling instant_min, as U (k) > and U_minTime, perform step 7, as U (k)≤U_minTime, then compare feedback voltage deviation e (k) and the voltage deviation threshold value M of current sample time and a current front sampling instant, when | e (k) | is during>=M, perform step 8, when | e (k) |<during M, performs step 7；

Step 7, master controller 1 output frequency f (k)=f (k-1), is then back to step 3；Wherein, f (k) is the frequency of master controller 1 current sample time output, and f (k-1) is the frequency of master controller 1 currently front sampling instant output；

Step 8, master controller 1 output frequency f (k)=f (k-1)+C₀e(k)+C₁e(k-1)+C₂E (k-2)；It is then back to step 3；Wherein, C₀For scaling referring factor and C₀=1.2K_p+K_i+K_d, C₁Referring factor and C is amplified for integration₁=-(K_p+2K_d), C₂Referring factor and C is amplified for differential₂=K_d；E (k-1) is feedback voltage deviation and the e (1)=0 in a currently front sampling instant and current front double sampling moment, when k >=3, e (k-1)=U (k-1)-U (k-2), U (k-2) are the negative direct current high voltage feedback signal of power conversion circuit output described in the current front double sampling moment；E (k-2) is feedback voltage deviation and e (the 0)=e (1)=0 of current front double sampling moment and current first three sampling instant, when k >=4, e (k-2)=U (k-2)-U (k-3), U (k-3) are the negative direct current high voltage feedback signal of power conversion circuit output described in current first three sampling instant.

The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure change above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.

Claims (9)

1. the control method of a digitized anion generator; described digitized anion generator includes the power conversion circuit for the negative direct current high voltage that 24V DC voltage conversion is-6.5kV～-11kV exported by 24V DC source (16), for the master controller (1) that power conversion circuit is controlled with for the voltage conversion circuit powered for power circuit each in digitized anion generator, and protection circuit and the negative direct current high voltage signal for being exported by described power conversion circuit feed back to the negative high voltage feedback circuit of master controller (1)；Described power conversion circuit is made up of LC half-bridge resonance circuit (2) being sequentially connected with, piezoelectric ceramic transformer (3) and two voltage-multiplying circuits (4), and described LC half-bridge resonance circuit (2) is connected with the outfan of 24V DC source (16)；Described protection circuit includes being connected with the current signal sampling end of LC half-bridge resonance circuit (2) and for the current foldback circuit (5) that piezoelectric ceramic transformer (3) mistake stream is protected with for the overheated overheating protection circuit (6) protected of piezoelectric ceramic transformer (3)；Described negative high voltage feedback circuit is made up of the bleeder circuit (7) being sequentially connected with, half-wave rectifying circuit (8) and voltage limiter circuit (9), and the input of described bleeder circuit (7) and the outfan of two voltage-multiplying circuits (4) connect；The outfan of described current foldback circuit (5) connects with the input of master controller (1); the input of described master controller (1) is further connected with A/D change-over circuit (10); the outfan of described overheating protection circuit (6) and the outfan of voltage limiter circuit (9) are all connected with the input of A/D change-over circuit (10), and the input of described A/D change-over circuit (10) is further connected with the voltage given circuit (11) of the negative direct current high voltage size for giving the output of described power conversion circuit；The outfan of described master controller (1) is connected to drive circuit (12), and described LC half-bridge resonance circuit (2) is connected with the outfan of drive circuit (12)；Described voltage conversion circuit includes the 5V voltage conversion circuit (13) for the 24V DC voltage that 24V DC source (16) exports is converted to 5V, for the 5V DC voltage that 5V voltage conversion circuit (13) exports being converted to the 3.3V voltage conversion circuit (14) of 3.3V and for the 3.3V DC voltage that 3.3V voltage conversion circuit (14) exports being converted to the 1.5V voltage conversion circuit (15) of 1.5V, described master controller (1) all connects with the outfan of 3.3V voltage conversion circuit (14) and 1.5V voltage conversion circuit (15), described current foldback circuit (5), overheating protection circuit (6), A/D change-over circuit (10), voltage given circuit (11) and drive circuit (12) all connect with the outfan of 5V voltage conversion circuit (13)；It is characterized in that the method comprises the following steps:

Step one, parameter are arranged: the relation table of the voltage of the frequency exported by the master controller (1) measured in advance and digitized anion generator output is stored in master controller (1), and set the master controller (1) frequency to its output and carry out the Proportional coefficient K of PID control_p, integral coefficient K_i, differential coefficient K_dWith voltage deviation threshold value M, and the current setting value I of piezoelectric ceramic transformer (3)_s, piezoelectric ceramic transformer (3) desired temperature T_sDeviation delta U upper and lower with voltage, and be stored in master controller (1)；

Step 2, startup digitized anion generator: operation voltage given circuit (11), input voltage setting value U_sTo master controller (1), the frequency that the master controller (1) that master controller (1) inquiry is stored therein exports and the relation table of the voltage of digitized anion generator output, find voltage setting value U_sThe frequency f that corresponding master controller (1) exports, and output frequency f is to drive circuit (12), drive circuit (12) drives LC half-bridge resonance circuit (2) work, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer (3) transformation, two voltage-multiplying circuits (4) multiplication of voltage；And, master controller (1) is always according to formula U_max=U_s+ Δ U calculates and obtains upper voltage limit value U_maxAnd store, always according to U_min=U_s-Δ U calculates and obtains voltage lower limit value U_minAnd store；

Step 3, signals collecting and storage: the temperature of piezoelectric ceramic transformer (3) is carried out detection in real time and exported by the signal detected to A/D change-over circuit (10) by described overheating protection circuit (6), simultaneously, the current signal of LC half-bridge resonance circuit (2) is carried out detection in real time and is exported by the signal detected to master controller (1) by described current foldback circuit (5), the negative direct current high voltage signal that described power conversion circuit is exported by described negative high voltage feedback circuit carries out detection in real time and is exported by the signal detected to A/D change-over circuit (10), described master controller (1) is sampled by the current signal of cycle t LC half-bridge resonance circuit (2) that current foldback circuit (5) is detected, and sample by the negative direct current high voltage feedback signal of the cycle t temperature signal and the output of described power conversion circuit that A/D change-over circuit (10) carried out the piezoelectric ceramic transformer (3) that analog digital conversion obtains, and the negative direct current high voltage feedback signal and the negative direct current high voltage feedback signal that currently power conversion circuit described in a front sampling instant exports to power conversion circuit output described in current sample time stores；Wherein current sample time is designated as kth sampling instant, the negative direct current high voltage feedback signal of power conversion circuit output described in current sample time is designated as U (k), a currently front sampling instant is designated as-1 sampling instant of kth, by described in a currently front sampling instant power conversion circuit output negative direct current high voltage feedback signal be designated as U (k-1), k be not less than 2 positive integer；

Step 4, mistake flow judgement: described master controller (1) compares current signal I (k) and the current setting value I of kth sampling instant LC half-bridge resonance circuit (2)_s, as I (k)≤I_sTime, perform step 5；Otherwise, as I (k) > I_sTime, master controller (1) output frequency f (k)=0；It is then back to step 3；

Step 5, overheated judgement: described master controller (1) compares temperature signal T (k) and the desired temperature T of kth sampling instant piezoelectric ceramic transformer (3)_s, as T (k)≤T_sTime, perform step 6；Otherwise, as T (k) > T_sTime, master controller (1) output frequency f (k)=0；It is then back to step 3；

Step 6, feedback voltage comparison: first, described master controller (1) compares negative direct current high voltage feedback signal U (k) of power conversion circuit output described in current sample time and the negative direct current high voltage feedback signal U (k-1) of power conversion circuit output described in a currently front sampling instant, obtains feedback voltage deviation e (k)=U (the k)-U (k-1) of current sample time and a currently front sampling instant；Then, described master controller (1) compares negative direct current high voltage feedback signal U (k) and the upper voltage limit value U of power conversion circuit output described in current sample time_max, as U (k) >=U_maxTime, then compare feedback voltage deviation e (k) of current sample time and a currently front sampling instant and voltage deviation threshold value M, when | e (k) | is during≤M, perform step 7, as | e (k) | > M, perform step 8；Otherwise, as U (k) < U_maxTime, then compare feedback voltage deviation e (k) and the voltage lower limit value U of current sample time and a currently front sampling instant_min, as U (k) > and U_minTime, perform step 7, as U (k)≤U_minTime, then compare feedback voltage deviation e (k) and the voltage deviation threshold value M of current sample time and a current front sampling instant, when | e (k) | is during>=M, perform step 8, when | e (k) |<during M, performs step 7；

Step 7, master controller (1) output frequency f (k)=f (k-1), be then back to step 3；Wherein, f (k-1) is the frequency of master controller (1) currently front sampling instant output；

Step 8, master controller (1) output frequency f (k)=f (k-1)+C₀e(k)+C₁e(k-1)+C₂E (k-2)；It is then back to step 3；Wherein, C₀For scaling referring factor and C₀=1.2K_p+K_i+K_d, C₁Referring factor and C is amplified for integration₁=-(K_p+2K_d), C₂Referring factor and C is amplified for differential₂=K_d；E (k-1) is feedback voltage deviation and the e (1)=0 in a currently front sampling instant and current front double sampling moment, when k >=3, e (k-1)=U (k-1)-U (k-2), U (k-2) are the negative direct current high voltage feedback signal of power conversion circuit output described in the current front double sampling moment；E (k-2) is feedback voltage deviation and e (the 0)=e (1)=0 of current front double sampling moment and current first three sampling instant, when k >=4, e (k-2)=U (k-2)-U (k-3), U (k-3) are the negative direct current high voltage feedback signal of power conversion circuit output described in current first three sampling instant.

2. the control method of a kind of digitized anion generator described in claim 1, it is characterised in that: the detailed process measuring frequency that master controller (1) exports and the relation table of the voltage of digitized anion generator output described in step one in advance is:

The frequency f that step 101, described master controller (1) export starts to change in the way of 0.1Hz is incremented by from 65Hz in the scope of 65Hz～75Hz, output frequency f is to drive circuit (12), drive circuit (12) drives LC half-bridge resonance circuit (2) work, then through exporting negative direct current high voltage signal after piezoelectric ceramic transformer (3) transformation, two voltage-multiplying circuits (4) multiplication of voltage；

The negative direct current high voltage signal that two voltage-multiplying circuits (4) export is carried out detection in real time and is exported by the signal detected to A/D change-over circuit (10) by step 102, described negative high voltage feedback circuit, A/D change-over circuit (10) exports after signal is carried out A/D conversion to master controller (1), and master controller (1) analyzing and processing obtains the voltage of digitized anion generator output；

The relation table of the voltage that the frequency f that step 103, described master controller (1) record master controller (1) export exports with digitized anion generator.

3. the control method of a kind of digitized anion generator described in claim 1, it is characterized in that: described LC half-bridge resonance circuit (2) includes NMOS power tube Q3, inductance L1, nonpolar electric capacity C3, nonpolar electric capacity C4 and nonpolar electric capacity C5, the grid of described NMOS power tube Q3 is connected by the outfan of resistance R12 with drive circuit (12), one end of described inductance L1 connects with the outfan of 24V DC source (16), the source electrode of described NMOS power tube Q3 and the other end of inductance L1, one end of nonpolar electric capacity C3 and one end of nonpolar electric capacity C5 connects and for the outfan of LC half-bridge resonance circuit (2), the drain electrode of described NMOS power tube Q3 is by resistance R13 ground connection, the described drain electrode of NMOS power tube Q3 and the link of resistance R13 are the current signal sampling end of LC half-bridge resonance circuit (2), the other end of described nonpolar electric capacity C3 passes through nonpolar electric capacity C4 ground connection, the other end ground connection of described nonpolar electric capacity C5；Described piezoelectric ceramic transformer (3) is multilayer piezoelectric ceramic transformer MPT1, one end of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1 connects with the outfan of LC half-bridge resonance circuit (2), the other end ground connection of the primary piezo oscillator of described multilayer piezoelectric ceramic transformer MPT1, the outfan that one end is piezoelectric ceramic transformer (3) of the secondary piezoelectric oscillator of described multilayer piezoelectric ceramic transformer MPT1；Described two voltage-multiplying circuits (4) are made up of diode D1, diode D2 and nonpolar electric capacity C6, the anode of described diode D1 and the negative electrode of diode D2 all connect with the outfan of piezoelectric ceramic transformer (3), the minus earth of described diode D1, the anode of described diode D2 is the outfan of two voltage-multiplying circuits (4) and passes through nonpolar electric capacity C6 ground connection.

4. the control method of a kind of digitized anion generator described in claim 1, it is characterised in that: described master controller (1) is fpga chip EP2C5T144C8N.

5. the control method of a kind of digitized anion generator described in claim 4, it is characterized in that: described A/D change-over circuit (10) includes modulus conversion chip AD7862, the Verf pin of described modulus conversion chip AD7862 and VDD pin all connect with the outfan of 5V voltage conversion circuit (13), the DB0 pin of described modulus conversion chip AD7862, DB1 pin, DB2 pin, DB3 pin, DB4 pin, DB5 pin, DB6 pin, DB7 pin, DB8 pin, DB9 pin, DB10 pin and DB11 pin are corresponding in turn to the 94th pin with fpga chip EP2C5T144C8N, 93rd pin, 92nd pin, 87th pin, 86th pin, 81st pin, 80th pin, 79th pin, 76th pin, 75th pin, 74th pin and the 73rd pin connect, described modulus conversion chip AD7862'sPin, BUSY pin, RD pin, CS pin and A0 pin are corresponding in turn to the 4th pin with fpga chip EP2C5T144C8N, the 3rd pin, the 7th pin, the 8th pin and the 24th pin and connect; the VB1 pin of described modulus conversion chip AD7862 connects with the outfan of voltage limiter circuit (9) and by nonpolar electric capacity C1 ground connection; the VA1 pin of described modulus conversion chip AD7862 connects with the outfan of overheating protection circuit (6), and the VB2 pin of described modulus conversion chip AD7862 connects with the outfan of voltage given circuit (11)；Described voltage given circuit (11) is made up of slide rheostat VR1 and nonpolar electric capacity C2, the outfan of one termination 5V voltage conversion circuit (13) of described slide rheostat VR1, the other end ground connection of described slide rheostat VR1, the outfan that sliding end is voltage given circuit (11) of described slide rheostat VR1, and by nonpolar electric capacity C2 ground connection.

6. the control method of a kind of digitized anion generator described in claim 4, it is characterized in that: described drive circuit (12) is made up of symmetrical audion Q1, audion Q2, resistance R1 and resistance R2, described symmetrical audion Q1 by audion Q1-1 in NPN type and under positive-negative-positive audion Q1-2 form；The base stage of described audion Q2 is the input of drive circuit (12) and connects with the 9th pin of fpga chip EP2C5T144C8N, the colelctor electrode of described audion Q2, in NPN type audion Q1-1 base stage and under positive-negative-positive the base stage of audion Q1-2 connect each through the outfan of resistance R2 and 5V voltage conversion circuit (13), in described NPN type, the colelctor electrode of audion Q1-1 is connected by the outfan of resistance R1 and 5V voltage conversion circuit (13), the equal ground connection of colelctor electrode of audion Q1-2 under the emitter stage of described audion Q2 and positive-negative-positive, in described NPN type audion Q1-1 emitter stage and under positive-negative-positive the emitter stage of audion Q1-2 connect and for the outfan of drive circuit (12).

7. the control method of a kind of digitized anion generator described in claim 1, it is characterized in that: described bleeder circuit (7) is made up of the resistance R16 connected and resistance R17, the input that one end is bleeder circuit (7) after described resistance R16 and resistance R17 series connection, other end ground connection；Described half-wave rectifying circuit (8) is made up of diode D5, diode D6 and nonpolar electric capacity C13, the anode of described diode D5 and the negative electrode of diode D6 all connect with the link of resistance R16 and resistance R17, the anode of described diode D6 and the equal ground connection of the other end of nonpolar electric capacity C13；Described voltage limiter circuit (9) is made up of Zener diode DZ3, and the negative electrode of described Zener diode DZ3 connects with the negative electrode of diode D5 and for the outfan of voltage limiter circuit (9), the plus earth of described Zener diode DZ3.

8. the control method of a kind of digitized anion generator described in claim 1, it is characterized in that: described current foldback circuit (5) includes comparator U8B, audion Q1, the reference voltage circuit connected with the in-phase input end of comparator U8B and the signals collecting amplifying circuit connected with the inverting input of comparator U8B, described reference voltage circuit is by resistance R19, resistance R20, Zener diode DZ4 and nonpolar electric capacity C14 composition, one end after described resistance R19 and resistance R20 series connection connects with the outfan of 5V voltage conversion circuit (13), other end ground connection, the reference voltage output terminal that link is reference voltage circuit of described resistance R19 and resistance R20, the negative electrode of described Zener diode DZ4 and one end of nonpolar electric capacity C14 all connect with the outfan of 5V voltage conversion circuit (13), the anode of described Zener diode DZ4 and the equal ground connection of the other end of nonpolar electric capacity C14；Described signals collecting amplifying circuit is made up of operational amplifier U8A, resistance R21, resistance R22 and nonpolar electric capacity C15, the in-phase input end of described operational amplifier U8A is current signal input and the current signal sampling end with LC half-bridge resonance circuit (2) connects, the inverting input of described operational amplifier U8A passes through resistance R22 ground connection, described resistance R21 and nonpolar electric capacity C15 is connected in parallel between inverting input and the outfan of operational amplifier U8A, the outfan that outfan is signals collecting amplifying circuit of described operational amplifier U8A；The base stage of described audion Q1 connects with the outfan of comparator U8B; the grounded collector of described audion Q1, the outfan of the transmitting extremely current foldback circuit (5) of described audion Q1 and being connected by the outfan of resistance R18 and 5V voltage conversion circuit (13)；Described overheating protection circuit (6) is made up of temperature sensor MCP9701.

9. the control method of a kind of digitized anion generator described in claim 1, it is characterized in that: described 5V voltage conversion circuit (13) includes step-down switching regulator MCP16301, switching diode D3, switching diode D4, Zener diode DZ1, Zener diode DZ2 and inductance L2,4th pin of described step-down switching regulator MCP16301 and the 5th pin connect each through the negative electrode insuring F1 and switching diode D3, and by polar capacitor C7 ground connection；The anode of described switching diode D3 and the negative electrode of Zener diode DZ1 all connect with the outfan of 24V DC source (16), the plus earth of described Zener diode DZ1, 1st pin of described step-down switching regulator MCP16301 connects with the negative electrode of switching diode D4, and connected by the negative electrode of nonpolar electric capacity C12 and Zener diode DZ2 and one end of inductance L2, the plus earth of described Zener diode DZ2, the anode of described switching diode D4 and the other end of inductance L2 connects and for the outfan of 5V voltage conversion circuit (13), and by polar capacitor C8 ground connection；Being connected to the resistance R14 and resistance R15 that connect between outfan and the ground of described 5V voltage conversion circuit (13), the 3rd pin of described step-down switching regulator MCP16301 connects with the link of resistance R14 and resistance R15；Described 3.3V voltage conversion circuit (14) includes chip AMS1117-3.3V, 3rd pin of described chip AMS1117-3.3V connects with the outfan of 5V voltage conversion circuit (13), and by polar capacitor C9 ground connection, the 1st pin ground connection of described chip AMS1117-3.3V, the outfan that 2nd pin is 3.3V voltage conversion circuit (14) of described chip AMS1117-3.3V, and by polar capacitor C10 ground connection；Described 1.5V voltage conversion circuit (15) includes chip AMS1117-1.5V, 3rd pin of described chip AMS1117-1.5V connects with the outfan of 3.3V voltage conversion circuit (14), the 1st pin ground connection of described chip AMS1117-1.5V, the outfan that 2nd pin is 1.5V voltage conversion circuit (15) of described chip AMS1117-1.5V, and by polar capacitor C11 ground connection.