CN209659158U - A kind of corona discharge method plasma sewage treatment system high-efficiency pulse power supply - Google Patents

Abstract

The utility model belongs to high voltage power supply technical field, it is related to a kind of corona discharge method plasma sewage treatment system efficient high-pressure pulse power, main structure includes three-phase main-frequency current rectifying and wave filtering circuit, Γ-ZSdc-dc booster circuit, voltage doubling rectifing circuit and voltage coupling circuit；Three-phase main-frequency current rectifying and wave filtering circuit is formed using conventional three-phase power frequency diode rectifier circuit and LC filter circuit, Γ-ZSdc-dc booster circuit includes Γ-ZS lattice network and H-bridge circuit, the input terminal and output end of Γ-ZS network are connected with the output end of the three-phase main-frequency current rectifying and wave filtering circuit and institute's H-bridge circuit respectively, the H-bridge circuit of voltage doubling rectifing circuit multiplexing Γ-ZSdc-dc booster circuit, it further include the second winding and the tertiary winding and capacitor-diode pair of the high turn ratio transformer of high frequency, the protective resistance and filter inductance of the output termination voltage coupling circuit of voltage doubling rectifing circuit, its energy loss is few, efficiency and reliability is high, save space and cost.

Description

A kind of corona discharge method plasma sewage treatment system high-efficiency pulse power supply

Technical field:

The utility model belongs to high voltage power supply technical field, is related to a kind of corona discharge method plasma sewage treatment system With the efficient high-pressure pulse power.

Background technique:

Gas ions sewage disposal system because it is widely applicable, that organic removal rate is high and does not bring secondary pollution etc. is excellent Gesture is the more satisfactory method of sewage treatment field and obtains domestic and international extensive concern, as document horse is conquered east low-temperature plasma Body in the treatment of waste water application and its mechanism the Lanzhou research [D]: Northwest Normal University, 2007.Wherein high-frequency impulse is put Power technology and high frequency pulse power supply become the key problem in technology of sewage disposal system, and the method for generating low temperature plasma is common Have: electron beam irradiation method, dielectric barrier discharge method, surface-discharge method and corona discharge method etc., most of high frequency pulse power supply is all It is using two-level configuration: previous diodes uncontrollable rectifier, rear class full-bridge (half-bridge) inverter circuit structure, such as document " Wu Haixia, Qi Health care plasma sewage treatment high-voltage DC power supply studies [J] power electronic technique, 2013,47 (5): 74-75 " and " Lee The Harbin research [D] of bright red .AC_DC gas-liquid two-phase electric discharge wastewater treatment power supply: Harbin Institute of Technology, 2008 ".Corona Electric discharge is at low cost and obtain the favor of industry since its structure is simple.Corona discharge method, can with the work of streamer-discahrge mode Obtain low temperature plasma.The high-frequency ac voltage met certain condition, which is superimposed with high-voltage dc voltage and can be realized streamer, to be put Electricity,

Document " control in multiple pollutant by Jiang Xuedong alternating current-direct current overlapped high-frequency high-voltage switch power supply and its discharge plasma Beijing application study [D] in reason: Beijing Jiaotong University, 2017 " devise two individual DC voltages and alternating voltage phase Power of alterating and direct current obtained from superposition, can be realized low temperature plasma, and effect is obvious in sewage disposal system.But it should Circuit structure is complicated, and model machine cost performance is not high, and two sets of rectified three-phase circuits and two sets of H-bridge circuits cause system hardware cost Double and control system complication.CN 103219913A discloses a kind of high pressure for plasma sewage treatment system The pulse power proposes to realize that high-frequency and high-voltage AC/DC pulse voltage, the circuit use two-grade full-bridge circuit with a set of three-level circuit Realize that the high voltage gain of circuit, tertiary circuit realize the boosting of the DC voltage of 5 multiplication of voltages using Multiple coil high frequency transformer Function, meanwhile, alternating voltage needed for being obtained with the 4th winding obtains high voltagehigh frequency alterating and direct current by AC-DC coupling circuit, though It so perfectly solves the disadvantage that power of alterating and direct current uses two sets of independent circuits to provide respectively, while utilizing two-stage boosting and times repoussage Current circuit realizes high pressure adjustable function, and still, the introducing of two-grade full-bridge circuit increases high-power controllable switch and related control Circuit processed.The increase of hardware circuit not only increases the weight, volume and cost of system, while bringing the increasing of system failure rate The disadvantages of summing it up inefficiency.

Summary of the invention:

The goal of the invention of the utility model is to overcome disadvantage of the existing technology, for high-frequency and high-voltage power of alterating and direct current The disadvantages of multi-level pmultistage circuit hardware cost faced is high, whole efficiency is low, proposes fusion Γ-ZSdc-dc technology and times repoussage Flow Technique realizes two-stage boost function in the two-stage high voltage ac/dc pulse power of one, using single-level circuit, and then in multiplication of voltage High-voltage dc voltage is obtained under commutation technique, while being added on high-voltage dc voltage using the alternating voltage that the 4th winding generates Obtain the high-voltage pulse power source that can be used for plasma.

To achieve the goals above, the main structure of the utility model includes three-phase main-frequency current rectifying and wave filtering circuit, Γ- ZSdc-dc booster circuit, voltage doubling rectifing circuit and voltage coupling circuit；Three-phase main-frequency current rectifying and wave filtering circuit uses conventional three-phase work Frequency diode rectifier circuit and LC filter circuit composition, including three-phase rectification bridge, the filtered electrical being made of six rectifier diodes Sense and filter capacitor, six pulse wave direct currents after rectification are in parallel with filter capacitor again after connecting with filter inductance, and filter capacitor is steady DC voltage after pressure passes to Γ-ZSdc-dc booster circuit, and Γ-ZSdc-dc booster circuit includes Γ-ZS lattice network and H Bridge circuit, the input terminal and output end of Γ-ZS network respectively with the output end of the three-phase main-frequency current rectifying and wave filtering circuit and institute's H bridge Circuit is connected, and Γ-ZS network is made of coupling inductance, capacitor and diode, after the winding of coupling inductance is connected in series to the capacitor, then with Diodes in parallel, output end are connected to H bridge, and H bridge is by four insulated gate bipolar transistors and corresponding four afterflows two Pole pipe is constituted, and the upper down tube of H-bridge circuit, which simultaneously turns on (straight-through), can be realized the dc voltage boost function of Γ-ZS network, H bridge Circuit and the straight-through realization first class boost function of Γ-ZS lattice network；Series connection isolation capacitance and resonant inductance in H-bridge circuit circuit； Voltage doubling rectifing circuit is multiplexed the H-bridge circuit of Γ-ZSdc-dc booster circuit, further includes the second winding of the high turn ratio transformer of high frequency With the tertiary winding and capacitor-diode pair, boost multiple by the second winding and the tertiary winding the turn ratio and capacitor-diode pair Number determine, voltage doubling rectifing circuit output termination voltage coupling circuit protective resistance and filter inductance, export high straightening Galvanic electricity；Voltage coupling circuit include protective resistance, filter inductance, capacitance, inductance and plasma reactor load, filtering The input terminal of inductance is connect with protective resistance, output end and capacitance, inductance connection, and inductance and plasma reactor load Connection, the 4th winding of the high turn ratio transformer of high frequency connect output alternating current, the direct current and alternating current of output with capacitance After inductive coupling, energy is provided for plasma reactor load as high-frequency and high-voltage impulse power supply.

The working principle of the utility model are as follows: three-phase main-frequency diode rectifier circuit connects with power grid hands over the power frequency of power grid Galvanic electricity is converted to direct current, and optimizes the waveform of DC voltage and electric current, Γ-ZSdc-dc booster circuit by LC filter circuit Input terminal and output end be connected respectively with the output end of three-phase main-frequency current rectifying and wave filtering circuit and voltage coupling circuit input terminal, lead to The boost function for crossing Γ-ZS network and voltage doubling rectifing circuit exports stable high voltage direct current and alternating current, voltage coupling circuit By the electricity after alternating current electricity superposition obtained by high voltage direct current obtained by voltage multiplying rectifier and another way winding as plasma reactor Source.

D.C. magnetic biasing problem of the isolation capacitance described in the utility model in addition to high-frequency step-up transformer can be improved, also with it is humorous Shake inductance, insulated gate bipolar transistor and freewheeling diode composition resonant type soft-switch, and insulated gate bipolar transistor is made to work Under zero-current soft switch (ZCS) environment, the electromagnetic environment of circuit is improved, while improving the efficiency of system.

Γ-ZS lattice network through connect signal in Γ-ZSdc-dc booster circuit described in the utility model is controlled using PWM Mode, voltage doubling rectifing circuit control use pwm control circuit.

The circuit structure connection type that the utility model does not specifically describe is circuit common or general in the prior art Connection type.

The utility model compared with prior art, has the advantage that first is that realizing two-stage boosting function using primary circuit The turn ratio of existing single-stage booster circuit high frequency transformer can be reduced, and then reduces the design difficulty and energy of high frequency transformer Loss；Although reducing level-one H bridge high-frequency inversion and diode from hardware circuit second is that possessing two-stage boost function The circuits such as rectification, the reduction of active device improve the power density and control difficulty of system, have correspondingly improved the effect of system Rate and reliability；Third is that the high turn ratio transformer output winding of high frequency respectively obtains independent high voltage direct current and High Level AC Voltage, It carries out obtaining required alterating and direct current after being simply superimposed, reduces and carry out coupled discharge using two independent AC and DC power supplys The hardware circuit of mode, saves space and cost, further improves the efficiency and reliability of system.

Detailed description of the invention:

Fig. 1 is the main body circuit principle schematic diagram of the utility model.

Fig. 2 is three-phase main-frequency current rectifying and wave filtering circuit schematic diagram described in the utility model.

Fig. 3 is the Γ-ZS DC-DC booster circuit signal of fusion H-bridge circuit described in the utility model and Γ-ZS network Figure；

Fig. 4 is the utility model Γ-ZS DC-DC booster circuit operating mode schematic diagram.

Fig. 5 is voltage doubling rectifing circuit described in the utility model and voltage coupling circuit schematic diagram；

Fig. 6 is the full-bridge electricity for integrating voltage doubling rectifing circuit and Γ-ZSdc-dc circuit described in the utility model embodiment Road driving signal schematic diagram.

Specific embodiment:

The present invention will be further described by way of example and in conjunction with the accompanying drawings.

Embodiment:

Circuit knot described in the present embodiment for the high-efficiency pulse power supply of corona discharge method plasma sewage treatment system Structure is as shown in Figure 1, include three-phase main-frequency current rectifying and wave filtering circuit 1, Γ-ZSdc-dc booster circuit 2, voltage doubling rectifing circuit 3 and voltage Coupling circuit 4；

Wherein three-phase main-frequency current rectifying and wave filtering circuit 1 for conventional three-phase power frequency diode rectifier circuit and LC as shown in Fig. 2, filter Wave circuit, specifically by three-phase rectification bridge (6 rectifier diode D₁₁-D₁₆), filter inductance L₁, filter capacitor C₁It constitutes, after rectification Six pulse wave direct currents and filter inductance L₁After series connection again with filter capacitor C₁Parallel connection, filter capacitor C₁DC voltage after pressure stabilizing Pass to Γ-ZSdc-dc booster circuit 2；

The circuit structure of Γ-ZSdc-dc booster circuit 2 is as shown in figure 3, include Γ-ZS lattice network and H-bridge circuit two Divide (Γ-ZSdc-dc booster circuit 2 and voltage doubling rectifing circuit 3 are multiplexed the H-bridge circuit), Γ-ZS network is small using voltage-dropping type Turn ratio coupling inductance T₁, primary side winding N₁₁Be connected with the output end of three-phase main-frequency diode rectification filter circuit, the decompression of secondary side around Group N₁₂With capacitor C₂₁After series connection again with diode D₂Parallel connection is finally connected with H bridge, and three-phase main-frequency current rectifying and wave filtering circuit 1 is resulting Direct current realizes the boost function of direct current by Γ-ZSdc-dc booster circuit 2, and specific works mode is as shown in figure 4, H bridge (straight-through) is connected while upper down tube is achieved Γ-ZSdc-dc booster circuit, Γ-ZS lattice network output voltage V_PN It can be expressed asWherein n is transformer turns ratio N₂₂/N₂₁, D_shFor full-bridge duty ratio, V_C1For filtering Capacitor C₁Both end voltage；The output voltage V of Γ-ZS lattice network_PNThe both ends of H-bridge circuit are connected to, as voltage doubling rectifing circuit 3 Input；Concatenated isolation capacitance C in H-bridge circuit circuit₂₂Improve high-frequency step-up transformer T₂D.C. magnetic biasing problem, optimization High frequency transformer working environment, increases the service life of high frequency transformer.Capacitance C simultaneously₂₂With resonant inductance L₂₁、H Bridge arm IGBTS₂₁、IGBTS₂₂、 IGBTS₂₃、IGBTS₂₄And diode D₂₁, diode D₂₂, diode D₂₃And diode D₂₄ The function of constituting resonant type soft-switch, makes IGBTS₂₁、IGBTS₂₂、IGBTS₂₃、IGBTS₂₄Realize zero-current soft switch (ZCS) function Can, EMI (electromagnetic compatibility) characteristic of circuit is improved, while improving the efficiency of system；

Voltage doubling rectifing circuit 3 and voltage coupling circuit 4 are as shown in figure 5, H bridge passes through the high turn ratio transformer T of high frequency₂With again Voltage rectifier 3, the 4th winding N₂₄With capacitance C₄The alternating current generative circuit of composition is connected, the second winding N₂₂, third around Group N₂₃As the input of voltage doubling rectifing circuit 3, voltage doubling rectifing circuit 3 is become by the component pulse-changing power that H-bridge circuit generates Energy source, voltage doubling rectifing circuit 3 belongs to full-bridge mode, and upper and lower half-wave circuit symmetrical configuration is upper half-wave respectively by capacitor C₃₁、C₃₂, diode D₃₁、D₃₂、D₃₅、 D₃₆It constitutes, lower half-wave is by capacitor C₃₅、C₃₆, diode D₃₃、D₃₄、D₃₇、D₃₈It constitutes, symmetrically Boost capacitor above axis is C₃₃、C₃₄, specific work process is as follows: upper half-wave circuit, under the premise of the Same Name of Ends described in Fig. 5, In the second winding N₂₂The positive half cycle of voltage, diode D₃₂, diode D₃₆Conducting, diode D₃₁, diode D₃₅Reverse-biased cut-off, the Two winding N₂₂On energy and capacitor C₃₁、C₃₂Give capacitor C₃₃、 C₃₄While charging, energy is provided for load；In winding N₂₂Electricity The negative half period of pressure, diode D₃₁, diode D₃₅Conducting, diode D₃₂, diode D₃₆Reverse-biased cut-off, winding N₂₂On energy and Capacitor C₃₃Capacitor C is given together₃₁、C₃₂Charging, capacitor C₃₂Energy is provided for load；The lower half-wave circuit course of work and upper half-wave electricity Full symmetric, the 4th winding N of road work₂₄High-frequency alternating current is exported, the size of amplitude is mainly effective by the turn ratio and full-bridge circuit State duty ratio is adjusted, and herein, the size of alternating current amplitude size and voltage doubling rectifing circuit direct current output amplitude passes through high frequency High turn ratio transformer T₂Association, i.e., the size of alternating current and the size of direct current will consider cross regulation rate problem in control, The capacitance C of the output end connection voltage coupling circuit 4 of alternating current₄, export High Level AC Voltage V_ac；Voltage doubling rectifing circuit 3 Export the protective resistance R and filter inductance L of termination voltage coupling circuit 4₄₁, export high voltage direct current V_dc, resistance R plays current limliting The effect of protection, and filter inductance L₄₁Coupling is played, while protecting influence of the alternating current to direct current, capacitance C4 Influence of the direct current to alternating current can be protected；The alternating current and direct current of two-way output pass through inductance L₄₂Coupling superposition is carried out, High-frequency and high-voltage alterating and direct current needed for formation system is powered, inductance L for plasma reactor load 5₄₂As reactance Device can play the role of current-limiting protection.

The control circuit of the present embodiment can use the control method of traditional Full-bridge resonant soft switching circuit, such as Fig. 6 institute Show, voltage doubling rectifing circuit exports the size of DC voltage by transformer turns ratio N₂₂/N₂₁It is determined with full-bridge duty ratio D, this implementation The unique distinction of example is the control for being multiplexed full-bridge inverter and realizing rear class voltage doubling rectifing circuit and Γ-ZSdc-dc booster circuit, control System strategy the inside increases " straight-through " duty ratio, and the present embodiment belongs to the scope of Switching Power Supply, operating mode and Switching Power Supply thunder Together, cycling, in cycles, in t₀Before moment, the work of H bridge is in effective status, IGBTS at this time₂₁、IGBTS₂₄Conducting, IGBTS₂₂、IGBTS₂₃Shutdown, 1) Γ-ZSdc-dc booster circuit work operating mode shown in Fig. 4 (b), energy is provided for rear class Amount；2) the output energy of Γ-ZSdc-dc booster circuit is added in high frequency high voltage transformer winding N₂₁Both ends, both end voltage are V_PN。t₀-t₁Period, IGBTS₂₄Shutdown, while IGBTS₂₃It is connected, at this time transformer winding N₂₁Both end voltage is zero, Γ-ZSdc- Dc booster circuit and late-class circuit do not have energy exchange；t₁-t₂Period, H bridge enter straight-through moment, IGBTS₂₁、IGBTS₂₄、 IGBTS₂₂、IGBTS₂₃It all turns on, Γ-ZSdc-dc booster circuit enters direct mode operation shown in Fig. 4 (a), output and rear class Circuit is also without energy exchange.Capacitor C in Γ-ZSdc-dc booster circuit₂₁After prime three-phase main-frequency rectifying and wave-filtering Direct current gives winding N together₁₁Charging； t₂-t₃Period, the operating mode and t₀-t₁Period is consistent, belongs to traditional nought state；t₃- t₄Period, stage H bridge work in another effective status period, IGBTS₂₂、IGBTS₂₃Conducting, IGBTS₂₁、IGBTS₂₄It closes It is disconnected.The output energy of Γ-ZSdc-dc booster circuit is added in high frequency high voltage transformer winding N₂₁Both ends, both end voltage are-V_PN。t₄- t₅Period, state I GBTS₂₁、IGBTS₂₃Conducting, IGBTS₂₂、IGBTS₂₄Shutdown, Γ-ZSdc-dc booster circuit and rear class times Voltage rectifier and alternating current circuit belong to nought state all without energy exchange.Day part after the period, according to period work Make, rule in cycles carries out.

Claims (1)

1. a kind of corona discharge method plasma sewage treatment system high-efficiency pulse power supply, it is characterised in that main structure includes Three-phase main-frequency current rectifying and wave filtering circuit, Γ-ZSdc-dc booster circuit, voltage doubling rectifing circuit and voltage coupling circuit；Three-phase main-frequency is whole It flows filter circuit to form using conventional three-phase power frequency diode rectifier circuit and LC filter circuit, including by six rectifier diodes Three-phase rectification bridge, filter inductance and the filter capacitor of composition, six pulse wave direct currents after rectification connect with filter inductance after again with Filter capacitor is in parallel, and Γ-ZSdc-dc booster circuit includes Γ-ZS lattice network and H-bridge circuit, the input terminal of Γ-ZS network and Output end is connected with the output end of the three-phase main-frequency current rectifying and wave filtering circuit and institute's H-bridge circuit respectively, and Γ-ZS network is by coupling electricity Sense, capacitor and diode are constituted, after the winding of coupling inductance is connected in series to the capacitor, then with diodes in parallel, output end is connected to H Bridge, H bridge are made of four insulated gate bipolar transistors and corresponding four freewheeling diodes, and H-bridge circuit is gone here and there in circuit Join isolation capacitance and resonant inductance；Voltage doubling rectifing circuit is multiplexed the H-bridge circuit of Γ-ZSdc-dc booster circuit, further includes high frequency height The second winding and the tertiary winding and capacitor-diode pair of turn ratio transformer, the multiple that boosts is by the second winding and the tertiary winding The turn ratio and capacitor-diode pair number determine, voltage doubling rectifing circuit output termination voltage coupling circuit protective resistance And filter inductance, voltage coupling circuit include that protective resistance, filter inductance, capacitance, inductance and plasma reactor are negative It carries, the input terminal of filter inductance is connect with protective resistance, output end and capacitance, inductance connection, and inductance is anti-with plasma Device load connection is answered, the 4th winding of the high turn ratio transformer of high frequency is connect with capacitance.