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 a medium-high frequency step-up transformer. The power supply of the dielectric barrier discharge type ozone generator includes a DC input power supply, a single-phase full-bridge inverter circuit, an LCLC resonant network and a dielectric barrier discharge type ozone generator. The invention utilizes the LCLC resonant network to realize the second resonant step-up. The dielectric barrier discharge type ozone generator power supply disclosed by the present invention has the characteristics of simple circuit, high efficiency, small volume, and low cost. Since there is no medium and high frequency step-up transformer in the power supply, it can better overcome conventional dielectric barrier discharge type ozone generation. There are problems such as large transformer loss in the power supply of the device, magnetic saturation of the transformer and large volume of the power supply, which are conducive to the realization of high frequency.

Description

A dielectric barrier discharge type ozone generator power supply without medium and high frequency step-up transformer

technical field

The invention relates to a dielectric barrier discharge type ozone generator power supply, in particular to a new dielectric barrier discharge type ozone generator power supply without a medium-high frequency step-up transformer.

Background technique

Ozone is an allotrope of oxygen and a green oxidant with strong oxidizing ability. It has been widely used in sewage treatment, air purification, medicine and pharmaceuticals and other fields. Among them, the dielectric barrier discharge method has become the main method for producing ozone in industry because of its advantages such as relatively low energy consumption, high output of a single machine, and sufficient gas source.

The dielectric barrier discharge type ozone generator has a discharge stage and a non-discharge stage during operation, and the discharge initial voltage is as high as several KV to more than ten KV. At present, the power supply of the dielectric barrier discharge type ozone generator mainly includes the following types:

(1) Narrow pulse discharge power supply. The power supply with this structure has the advantages of simple control and can improve the discharge efficiency of the dielectric barrier discharge type ozone generator, but there are problems such as complex circuit, high cost and difficulty in increasing power. Generally, it is used as a specific waveform generator to study the dielectric barrier discharge type load. Dynamic characteristics, which are rarely used in actual systems;

(2) Voltage source type series load resonant type and current source type parallel load resonant type intermediate frequency or high frequency inverter power supply. In order to meet the discharge requirements, this power supply generally needs to introduce an intermediate frequency or high frequency step-up transformer. However, due to the large parameter fluctuations and wide frequency range when the dielectric barrier discharge load is working, the transformer is prone to magnetic saturation, and the design of the high-frequency step-up transformer is complicated, which makes the power supply large in size, high in cost, large in loss, and difficult to high frequency.

(3) Single-stage LC resonant high-frequency inverter power supply without medium and high-frequency transformers. Although the power supply of this structure avoids the use of transformers, the voltage gain is small through single-stage LC resonance boosting, and it is difficult to meet the high-efficiency discharge requirements of dielectric barrier discharge ozone generators.

To sum up, in the existing dielectric barrier discharge type ozone generator power supply, the narrow pulse discharge power supply has the disadvantages of complex circuit and difficulty in increasing the power, and the voltage source type series load resonant type and the current source type parallel load resonant type The high-frequency inverter power supply has the problems of large size, low efficiency, high cost, and magnetic saturation. The single-stage LC resonant high-frequency inverter power supply without a medium-high frequency transformer has the disadvantage of small voltage gain. Therefore, the above-mentioned power supply cannot efficiently solve the dielectric barrier Discharge type ozone generator power supply problem.

Contents of the invention

In view of the deficiencies in the prior art, the present invention proposes a dielectric barrier discharge type ozone generator power supply without a medium-high frequency step-up transformer.

The present invention is achieved through the following technical solutions:

A dielectric barrier discharge type ozone generator power supply without a medium and high frequency step-up transformer includes a DC input power supply, a single-phase full-bridge inverter circuit, an LCLC resonant network and a dielectric barrier discharge type ozone generator. It is characterized in that the input end of the LCLC resonant network is connected with a full-bridge inverter circuit, and the output end is connected with a dielectric barrier discharge type ozone generator.

The dielectric barrier discharge type ozone generator power supply without a medium-high frequency step-up transformer is characterized in that the positive and negative poles of the DC input power supply are respectively connected to the positive and negative input ports of the full-bridge inverter circuit.

The dielectric barrier discharge type ozone generator power supply without a medium-high frequency step-up transformer is characterized in that the output terminal A of the full-bridge inverter circuit is connected to one end of the first resonant inductance L1, and the other end of the first resonant inductance L1 One end is connected to one end of the first resonant capacitor C1, and the other end of the first resonant capacitor C1 is connected to the output end B of the full-bridge inverter circuit.

The dielectric barrier discharge type ozone generator power supply without medium and high frequency step-up transformer is characterized in that one end of the second resonant inductance L2 is connected to the common end of the first resonant inductance L1 and the first resonant capacitor C1, and the second The other end of the resonant inductor L2 is connected to one end of the second resonant capacitor C2, and the other end of the second resonant capacitor C2 is connected to the output terminal B of the full-bridge inverter circuit.

The dielectric barrier discharge type ozone generator power supply without medium and high frequency step-up transformer is characterized in that the input ports of the dielectric barrier discharge type ozone generator are respectively connected to both ends of the second resonant capacitor C2.

Compared with the prior art, the present invention has the following advantages:

(1) The structure of the power supply is simple, easy to design, small in size and low in cost;

(2) The power supply is boosted by non-destructive LCLC resonance, the voltage gain is very high, no need to use medium and high frequency step-up transformers, and the problem of magnetic saturation of medium and high frequency transformers is overcome, the loss is small, the efficiency is high, and it is convenient to realize high frequency;

(3) It is especially suitable for small and medium-sized dielectric barrier discharge ozone generators.

Description of drawings

Figure 1 adopts the main circuit diagram under the equivalent model of the ozone generator circuit.

Figure 2 Equivalent model of dielectric barrier discharge type ozone generator circuit.

Figure 3 LCLC double resonance principle.

Figure 4 Closed-loop control block diagram.

Figure 5 shows the voltage waveform on the generator under typical parameters.

Detailed ways

As shown in Figure 1, it is the equivalent model of the dielectric barrier discharge type ozone generator circuit. The equivalent impedance of the ozone generator, that is, the C _g and R _g values in Figure 1, can be obtained through related technologies.

As shown in Figure 2, a dielectric barrier discharge type ozone generator power supply proposed by the present invention without a medium and high frequency step-up transformer includes a DC input power supply, a single-phase full-bridge inverter circuit, an LCLC resonant network and a dielectric barrier discharge type Ozone generator. The input end of the LCLC resonant network is connected with the full-bridge inverter circuit, and the output end is connected with the dielectric barrier discharge type ozone generator.

Boost principle:

The power supply of the ozone generator proposed by the present invention utilizes a two-stage LC resonant network to realize resonant boosting. For a single-stage LC resonant ozone generator inverter power supply, after applying two complementary drive signals with a duty ratio of 0.5 to the full-bridge inverter circuit, the voltage gain is:

${\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; in</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; out</span>}}}{{\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; in</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&omega;</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&omega;</span>}<span\; class="notranslate">\; /</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}$

where ω _P is the undamped oscillation frequency, Q _p is the load quality factor, and:

${\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; )</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; )</span>{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}$

Among them, L _S and C _S are the resonant inductance and resonant capacitor respectively. By (d/dω)(A _v )=0, we get:

${\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; \&omega;</span>}}_{\mathrm{<span\; class="notranslate">\; p</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; vm</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}}{\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; P</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}$

If Q _P □1, then: That is, when the switching frequency is equal to the resonant frequency, the voltage gain is the largest, which is about Q _P . As shown in Figure 2, assuming a voltage gain of:

${\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; in</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; v</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; |</span>\frac{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; j\&omega;</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; |</span>$

Then the total voltage gain is: A _v =A _v1 *A _v2 , if A _v1 and ω _{r reach the maximum value at the same time, then when the operating angular frequency is equal to ω r ,} the double resonance boost can be realized (see Figure 3) .

The resonance parameter design process of the dielectric barrier discharge type ozone generator power supply of the present invention is as follows:

1. Determine the voltage gain A _v according to the input and output voltage parameters. ;

2. Obtain the equivalent impedance of the ozone generator through related technologies, namely C _g and R _g values;

3. According to A _v = A _v1 * A _v2 , reasonably distribute the voltage gains A _v1 and A _v2 , and combine the equivalent impedance of the ozone generator obtained in 2 to determine the second resonant inductance L2, the second resonant capacitor C2 and the operating angular frequency ω _r .

4. According to the value of A _v1 and the resonant angular frequency ω _r , determine the values of the first resonant inductance L1 and the first resonant capacitor C1;

Closed-loop control:

Figure 5 shows the closed-loop control block diagram, including voltage and current sampling circuits, filters, phase-locked control modules, delay links, dead zone generation circuits, drive circuits, and the proposed dielectric barrier discharge type without medium and high frequency step-up transformers Ozone generator power supply. The voltage and current signals of the ozone generator are collected separately, and then transmitted to the phase-locked control module after low-pass filtering. The phase-locked control module realizes the tracking of the voltage, current and frequency of the ozone generator, and then makes the power supply work stably.

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.