CN104038087A - Dielectric barrier discharge-type ozone generator power supply without intermediate-frequency or high-frequency step-up transformer - Google Patents

Abstract

The invention discloses a dielectric barrier discharge-type ozone generator power supply without an intermediate-frequency or high-frequency step-up transformer. The dielectric barrier discharge-type ozone generator power supply comprises a direct-current input power supply, a single-phase full-bridge inverter circuit, an LCLC resonant network and a dielectric barrier discharge-type ozone generator. The LCLC resonant network is used for realizing secondary resonant step-up. The dielectric barrier discharge-type ozone generator power supply has the advantages of simple circuit, high efficiency, small size and low cost. As no intermediate-frequency or high-frequency step-up transformer exists in the power supply, problems that the loss of the transformer is large, magnetic saturation is likely to happen to the transformer, the size of the power supply is large and the like as the conventional dielectric barrier discharge-type ozone generator power supply is used can be well overcome, and realization of high frequency is facilitated.

Description

A kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer

Technical field

The present invention relates to a kind of Dielectric Barrier Discharge Type Ozone Generator power supply, particularly a kind of novel medium barrier discharge type ozone generator power supply without medium-high frequency step-up transformer.

Background technology

Ozone is the allotrope of oxygen, is the extremely strong Green Oxidant of a kind of oxidability, has now been widely used in the every field such as sewage disposal, air cleaning, medical science pharmacy.Wherein, to have energy consumption relatively low because of it for dielectric barrier discharge method, and the advantage such as single machine yield is high, source of the gas abundance becomes the main method of industrial production ozone.

There is discharge regime and discharge regime not in Dielectric Barrier Discharge Type Ozone Generator when work, and discharge inception voltage is up to a few KV to tens KV, and Dielectric Barrier Discharge Type Ozone Generator power supply mainly contains following several at present:

(1) burst pulse discharge power supply.This structure power supply has to be controlled simple and can improve Dielectric Barrier Discharge Type Ozone Generator discharging efficiency advantage, but the problem such as have that circuit is complicated, cost is high and high-power is difficult, the specific waveshape generating device of general conduct is studied dielectric barrier discharge type load dynamic characteristic, in real system, seldom adopts;

(2) voltage-source type series load resonant formula and current source type shunt load resonant mode intermediate frequency or high frequency inverter.For reaching electric discharge requirement, this power supply generally need to be introduced intermediate frequency or high-frequency step-up transformer.Yet parameter fluctuation is large during due to dielectric barrier discharge type loaded work piece, wide frequency range, easily there is magnetic saturation in transformer, and high-frequency step-up transformer design is complicated, thereby makes power volume large, and cost is high, and loss is large, high frequencyization difficulty.

(3) without the single-stage LC resonant mode high frequency inverter of medium/high frequency transformer.Although this structure power supply has been avoided the use of transformer, by single-stage LC resonance step-up, voltage gain is little, is difficult to reach Dielectric Barrier Discharge Type Ozone Generator efficient discharge demand.

In sum, in existing Dielectric Barrier Discharge Type Ozone Generator power supply, there is the shortcoming that circuit is complicated, high-power is difficult in burst pulse discharge type power supply, voltage-source type series load resonant formula and current source type shunt load resonant mode high frequency inverter exist that volume is large, efficiency is low, cost is high and magnetic saturation problem, there is voltage gain minor defect in the single-stage LC resonant mode high frequency inverter without medium/high frequency transformer, thereby above-mentioned power supply can not solve Dielectric Barrier Discharge Type Ozone Generator powerup issue efficiently.

Summary of the invention

In view of the deficiency that prior art exists, the present invention proposes a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer.

The present invention is achieved by the following technical programs:

Without a Dielectric Barrier Discharge Type Ozone Generator power supply for medium-high frequency step-up transformer, comprise direct-current input power supplying, single-phase full bridge inverter circuit, LCLC resonant network and Dielectric Barrier Discharge Type Ozone Generator.It is characterized in that LCLC resonant network input is connected with full bridge inverter, output is connected with Dielectric Barrier Discharge Type Ozone Generator.

Described a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer, is characterized in that the both positive and negative polarity of direct-current input power supplying is connected with full bridge inverter positive-negative input end mouth respectively.

Described a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer, it is characterized in that full bridge inverter output terminals A is connected with one end of the first resonant inductance L1, the other end of the first resonant inductance L1 is connected with one end of the first resonant capacitance C1, and the other end of the first resonant capacitance C1 is connected with full bridge inverter output B.

Described a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer, it is characterized in that one end of the second resonant inductance L2 connects the common port of the first resonant inductance L1 and the first resonant capacitance C1, the other end of the second resonant inductance L2 is connected with one end of the second resonant capacitance C2, and the other end of the second resonant capacitance C2 is connected with full bridge inverter output B.

Described a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer, is characterized in that Dielectric Barrier Discharge Type Ozone Generator input port connects respectively at the two ends of the second resonant capacitance C2.

Compared with prior art the invention has the advantages that:

(1) power supply architecture is simple, is easy to design, and volume is little, and cost is low;

(2) power supply is by harmless LCLC resonance step-up, and voltage gain is very high, without using medium, high frequency step-up transformer, has overcome medium, high frequency transformer magnetic saturation problem, and loss is little, and efficiency is high, is convenient to realize high frequency;

(3) be particularly suitable for middle-size and small-size Dielectric Barrier Discharge Type Ozone Generator.

Accompanying drawing explanation

Fig. 1 adopts the major loop figure under circuit of ozonator equivalent model.

Fig. 2 Dielectric Barrier Discharge Type Ozone Generator circuit equivalent model.

Fig. 3 LCLC double resonance principle.

Fig. 4 closed-loop control block diagram.

Voltage waveform on generator under Fig. 5 canonical parameter.

Embodiment

Be illustrated in figure 1 Dielectric Barrier Discharge Type Ozone Generator circuit equivalent model.By correlation technique, can obtain the equiva lent impedance of ozone generator, i.e. C in Fig. 1 _gand R _gvalue.

As shown in Figure 2, a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer that the present invention proposes, comprises direct-current input power supplying, single-phase full bridge inverter circuit, LCLC resonant network and Dielectric Barrier Discharge Type Ozone Generator.Wherein LCLC resonant network input is connected with full bridge inverter, and output is connected with Dielectric Barrier Discharge Type Ozone Generator.

The principle of boosting:

The ozone generator power supply that the present invention proposes utilizes two-stage LC resonant network to realize resonance step-up.For single-stage LC resonant mode ozone generator inverter, after applying two-way duty ratio and be 0.5 complementary drive signal to full bridge inverter, voltage gain:

$A_v=\left|\frac{V_g\left(\mathrm{j\ω}\right)}{V_{\mathrm{in}}\left(\mathrm{j\ω}\right)}\right|=\frac{Z_{\mathrm{out}}}{Z_{\mathrm{in}}}=\frac{1}{\sqrt{(1-{(\mathrm{\ω}/{\mathrm{\ω}}_p)}^2)+{(\mathrm{\ω}/{\mathrm{\ω}}_p{Q}_p)}^2}}$

Wherein, ω _pfor undamped oscillation frequency, Q _pfor loaded quality factor, and:

${\mathrm{\ω}}_P=\frac{1}{\sqrt{L_S(C_S+C_g)}},Q_P=\frac{R_g}{{\mathrm{\ω}}_P{L}_S}={\mathrm{\ω}}_P(C_S+C_g)R_g$

Wherein, L _sand C _sbe respectively resonant inductance and resonant capacitance, by (d/d ω) (A _v)=0:

${\mathrm{\ω}}_r={\mathrm{\ω}}_p\frac{1}{\sqrt{1-1/2Q_P^2}},A_{\mathrm{vm}}=\frac{Q_P}{\sqrt{1-1/4Q_P^2}}$

If Q _p1: when switching frequency equals resonance frequency, voltage gain is maximum, is about Q _p.As shown in Figure 2, suppose voltage gain:

$A_{v1}=\left|\frac{V_1\left(\mathrm{j\ω}\right)}{V_{\mathrm{in}}\left(\mathrm{j\ω}\right)}\right|,A_{v2}=\left|\frac{V_g\left(\mathrm{j\ω}\right)}{V_1\left(\mathrm{j\ω}\right)}\right|$

Total voltage gain is: A _v=A _v1* A _v2if, A _v1with at ω _rthe upper maximum that simultaneously reaches, when operating angle frequency equals ω _rtime, can realize dual resonance step-up (seeing Fig. 3).

The resonant parameter design process of Dielectric Barrier Discharge Type Ozone Generator power supply of the present invention is as follows:

1,, according to input and output voltage parameter, determine voltage gain A _v.；

2, by correlation technique, obtain ozone generator equiva lent impedance, i.e. C _gand R _gvalue;

3, according to A _v=A _v1* A _v2reasonable distribution voltage gain A _v1and A _v2, in conjunction with the 2 ozone generator equiva lent impedances that obtain, determine the second resonant inductance L2, the second resonant capacitance C2 and operating angle frequencies omega _r.

4, according to A _v1value and resonance angular frequency ω _r, determine the value of the first resonant inductance L1 and the first resonant capacitance C1;

Closed-loop control:

Be illustrated in figure 5 closed-loop control block diagram, comprise voltage, current sampling circuit, filter, phase-locked control module, delay link, dead-zone generating circuit, drive circuit and the Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer proposing.Gather respectively ozone generator voltage and current signal, after low-pass filtering, import phase-locked control module into, by phase-locked control module, realize ozone generator electric current and voltage frequency-tracking, and then make power supply steady operation.

Claims (5)

1. the Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer, by direct-current input power supplying, single-phase full bridge inverter circuit, LCLC resonant network and Dielectric Barrier Discharge Type Ozone Generator, formed, it is characterized in that the secondary resonant network input that LCLC circuit forms is connected with single-phase full bridge inverter circuit, the output of resonant network is connected with Dielectric Barrier Discharge Type Ozone Generator.

2. a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer according to claim 1, is characterized in that the both positive and negative polarity of direct-current input power supplying is connected with full bridge inverter positive-negative input end mouth respectively.

3. a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer according to claim 1, it is characterized in that full bridge inverter output terminals A is connected with one end of the first resonant inductance L1, the other end of the first resonant inductance L1 is connected with one end of the first resonant capacitance C1, and the other end of the first resonant capacitance C1 is connected with full bridge inverter output B.

4. a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer according to claim 1, it is characterized in that one end of the second resonant inductance L2 connects the common port of the first resonant inductance L1 and the first resonant capacitance C1, the other end of the second resonant inductance L2 is connected with one end of the second resonant capacitance C2, and the other end of the second resonant capacitance C2 is connected with full bridge inverter output B.

5. a kind of Dielectric Barrier Discharge Type Ozone Generator power supply without medium-high frequency step-up transformer according to claim 1, it is characterized in that Dielectric Barrier Discharge Type Ozone Generator high-field electrode connects the common port of the second resonant inductance L2 and the second resonant capacitance C2, the earth polar of Dielectric Barrier Discharge Type Ozone Generator is connected with inverter output end B.