CN214626811U - High-frequency high-voltage dielectric barrier discharge circuit - Google Patents
High-frequency high-voltage dielectric barrier discharge circuit Download PDFInfo
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- CN214626811U CN214626811U CN202022943701.2U CN202022943701U CN214626811U CN 214626811 U CN214626811 U CN 214626811U CN 202022943701 U CN202022943701 U CN 202022943701U CN 214626811 U CN214626811 U CN 214626811U
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Abstract
The utility model discloses a high-frequency high-voltage dielectric barrier discharge circuit, which comprises a main loop and at least one load loop; each load loop is connected with the main loop; wherein, the major loop includes: for connecting power frequency cityElectrically converted to have an active frequency f0Source voltage U0The alternating square wave output power conversion module; the main loop also comprises a series resonance module, one end of the series resonance module is connected with one output end of the power conversion module, and the other end of the series resonance module is connected with the other output end of the power conversion module; each load loop is connected with the series resonance module in parallel; the series resonant module has a natural resonant frequency f, and when the circuit is in operation, f is maintained in the circuit0. The circuit utilizes the resonance characteristic of the series resonance circuit, and can generate high-frequency high-voltage sine alternating current for the load. The stable, efficient, continuous and reliable work of the load is ensured.
Description
Technical Field
The utility model belongs to the technical field of power supply circuit, in particular to high frequency high voltage circuit suitable for dielectric barrier discharge device.
Background
When low-temperature plasma is generated in a dielectric barrier discharge mode, the whole dielectric barrier discharge device has high impedance characteristics due to the barrier effect of the dielectric layer. In order to ensure that the dielectric barrier discharge device stably, efficiently, continuously and reliably generates low-temperature plasma, a technician needs to ensure that a high voltage is applied between two electrodes of the dielectric barrier discharge device.
In the prior art, a low-frequency ultrahigh-voltage alternating power supply or a medium-frequency ultrahigh-voltage alternating power supply is generally adopted as a power supply for dielectric barrier discharge, and the power supply applies a high voltage in a corresponding form between two electrodes for dielectric barrier discharge. For example, a dielectric barrier discharge device disclosed in patent application No. 201580072748.5, in which a high voltage power supply module is involved to obtain dc power from a battery and convert the dc power into ac power having a frequency in the range of 10kHz to 100kHz and a voltage amplitude in the range of 1kV to 7 kV. Such a power supply arrangement is now commonly used in a dielectric barrier discharge device to provide a sufficiently high energy to a gas source, so as to facilitate ionization of a target gas provided by the gas source and generate more low-temperature plasma.
In a reasonable range, a higher-amplitude source voltage is more beneficial to ionizing target gas and can generate more low-temperature plasmas more quickly, but meanwhile, a source voltage with an excessively high amplitude is difficult to obtain, when the source voltage is applied to large-scale industrial production, electronic components in a circuit face severe examination of voltage tolerance capability, and in order to ensure that each electronic component in the circuit works stably, technicians usually correspondingly select electronic components with higher rated voltages, so that the manufacturing cost of the whole circuit is inevitably increased. On the other hand, in the environment of the same circuit current, the ultrahigh-amplitude source voltage brings ultrahigh energy consumption of the device, and is the biggest obstacle to wide popularization in specific industrial fields such as wastewater treatment, waste liquid treatment and ozone generation which require large amount of plasma.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the present invention is to provide a circuit, which utilizes the resonance characteristic of a series resonance circuit and can generate high-frequency high-voltage sine alternating current for load.
Another object of the utility model is to provide a high frequency high voltage dielectric barrier discharge circuit, this circuit can discharge for dielectric barrier provides the discharge power, guarantees that it is stable, high-efficient, last, work reliably and produces low temperature plasma.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a high-frequency high-voltage dielectric barrier discharge circuit comprises a main loop and at least one load loop. The main loop comprises a power supply conversion module and a series resonance module;
specifically, the power conversion module includes: the rectifier module is used for rectifying power frequency commercial power input from the outside to convert the power frequency commercial power into fluctuating direct current; the filtering module is used for filtering abnormal direct current or alternating current components to obtain smooth direct current with fixed voltage amplitude; the voltage regulating module is used for regulating the voltage amplitude of the direct current to a desired magnitude within an allowable range; for converting a direct current of desired magnitude into a current of active frequency f0Source voltage U0The inversion module of alternating square waves;
the modules are sequentially arranged and sequentially connected, external power frequency mains supply is connected into the rectification module, and source frequency f is obtained between two output ends of the inversion module after sequential processing0Source voltage U0Alternating square wave.
And a blocking capacitor and a matching transformer are also arranged at the tail end of the inversion module. The blocking capacitor is arranged between the inversion module and the matching transformer, one end of the blocking capacitor is connected with one output end of the inversion module, and the other end of the blocking capacitor is connected with one end of the primary side of the matching transformer. The other end of the primary side of the matching transformer is connected with the other output end of the inversion module, and the secondary side of the matching transformer is connected with the series resonance module.
The number of turns of the primary coil of the matching transformer is N1The number of turns of the secondary winding is N2Setting the turn ratio of the primary side coil and the secondary side coil of the matching transformer as N; calculating to obtain the total input impedance of the primary side of the matching transformer as Z1The total output impedance of the secondary side is Z2The number of turns of the primary coil and the number of turns of the secondary coil are reasonably designed, so that the primary coil and the secondary coil are kept in the circuit
The source frequency f of the end output of the inverter module0Source voltage U0After the alternating square wave is subjected to blocking compensation by the blocking capacitor, the same-frequency alternating square wave U is obtained at the secondary side of the matching transformer1：
The series resonance module in the main loop comprises a series resonance inductor L and a series resonance capacitor C, one end of the series resonance inductor L is connected with one output end of the power conversion module, the other end of the series resonance inductor L is connected with one end of the series resonance capacitor C, the other end of the series resonance capacitor C is connected with the other output end of the power conversion module, and two output ends of the main loop are led out from two ends of the series resonance capacitor.
An LC series resonance circuit formed by the connection of a series resonance inductor L and a series resonance capacitor C has a natural resonance frequency f, and the inversion frequency of an inversion module is adjusted so that f-f is kept in the circuit0Then the series resonant module reaches its resonant state, at which time the entire series resonant module is purely resistive. Choose low-loss high frequency inductance as series resonance inductance L for use, choose the high frequency electric capacity of low dielectric loss as series resonance electric capacity C for use, rationally set up L C size, then can be when series resonance module reaches its resonant condition, the module obtains high quality factor Q:
and further obtain Q times of U all the time on the series resonance capacitor1Same-frequency sine alternating current U2：
Because the series resonance module has extremely high quality factor Q in the resonance state, high-frequency and high-voltage sine alternating current U can be obtained on the series resonance capacitor in the resonance state2。
The main loop adopts the conversion form that power conversion module + series resonance module combines, has multiple beneficial effect: firstly, the power conversion module group composed of the rectification module, the filtering module, the voltage regulating module and the inversion module has clear module group structure, when the module group works, the inversion frequency of the inversion module is correspondingly adjusted, and the ideal and higher voltage source frequency f can be obtained0When the high-frequency alternating current is applied to a load, the excitation effect which can be realized only by high-amplitude voltage originally can be satisfied only by lower voltage amplitude by adopting the main loop according to the high-frequency characteristic; secondly, the series resonance module formed by the combination of the series resonance inductor and the series resonance capacitor can naturally convert the alternating current square wave output by the inverter module into an alternating current sine wave, and the sine wave has a more moderate conversion trend compared with the square wave, thereby effectively avoiding the voltage mutation in the square wave
Interference to subsequent circuitry; in the circuit, a reasonable quality factor Q is constructed by reasonably setting the inductive reactance of the series resonance inductor and the capacitive reactance of the series resonance capacitor in the main loop, the voltage amplification characteristic of the series resonance circuit during resonance is utilized, and a Q-time voltage amplification effect is obtained on the series resonance capacitor, so that the voltage amplification effect is very ideal; in addition, when the main loop works, as the main loop works in a current and voltage resonance state, the corresponding switch element in the inversion module can work in a soft switch state under the state, so that the reliability and the conversion efficiency of the power conversion module are improved; finally, due to the main circuitThe voltage is amplified by using the resonance characteristic of the series resonance circuit, and the matching transformer only plays a role of impedance matching in the main loop, so the turn ratio of the matching transformer can be set in a smaller numerical range, and a series of problems of large coil energy density, serious coil heating, complex parasitic inductance/parasitic capacitance and the like caused by the overlarge turn ratio of the transformer are further avoided.
The main loop is applied to a load loop which takes a dielectric barrier discharge device as a core load, the main loop is used as excitation to drive a plurality of paths of load loops, each path of load loop comprises the dielectric barrier discharge device, and the device consists of two tubular or plate-shaped discharge electrodes, a dielectric barrier layer clamped between the two electrodes and a discharge gap. Two discharge electrodes in each dielectric barrier discharge device are respectively connected with two ends of a series resonance capacitor, when the series resonance module reaches a resonance state, the dielectric barrier discharge device obtains high-frequency high-voltage sine alternating current with the same frequency and the same voltage amplitude value with the series resonance capacitor, and the high-frequency high-voltage alternating current generated by the main loop is applied between the two discharge electrodes of the dielectric barrier discharge device, so that stable and reliable high-power supply guarantee is provided for the dielectric barrier discharge device to stably, efficiently, continuously and reliably generate low-temperature plasma.
In each load loop, a current-limiting capacitor is correspondingly arranged for the dielectric barrier discharge device connected in the load loop, the current-limiting capacitor is arranged between the series resonance capacitor and the dielectric barrier discharge device, one end of the current-limiting capacitor is connected with one end of the series resonance capacitor, and the other end of the current-limiting capacitor is connected with a corresponding electrode of the corresponding dielectric barrier discharge device, so that the current-limiting capacitor plays roles of effectively limiting current and protecting the corresponding dielectric barrier discharge device.
Although the multi-path load circuit works together, the overall discharge effect can be improved, in the actual use process, the dielectric barrier discharge device is easily broken down by high voltage to cause short-circuit fault of the load circuit, and once a certain load circuit has short-circuit fault, the whole dielectric barrier discharge circuit triggers current overload protection to stop.
In order to solve the above problem, the utility model provides an among the high frequency high voltage dielectric barrier discharge circuit, to every load circuit all the way, all will additionally set up the protection that has automated inspection and overflows and automatic cutout function when this load circuit takes place short-circuit fault shut down along separate routes: the device consists of a current sampler, a current comparator, a cut-off signal generator and a protective relay; the protection relay is arranged between the dielectric barrier discharge device and the series resonance capacitor, a first end of a switch in the protection relay is connected with a corresponding discharge electrode of the dielectric barrier discharge device, and a second end of the switch is connected with a corresponding end of the series resonance capacitor;
the current sampler obtains a current sampling signal at the common end of the series resonance capacitor of the protective relay, the sampling signal is connected to the current comparator, a technician inputs a given current value into the other input end of the current comparator in advance, the current comparator compares the sampling signal with the given current value, the comparison result is connected to the cut-off signal generator, the cut-off signal generator correspondingly sends out a cut-off signal according to the comparison result, and the cut-off signal can be connected to the control iron core of the protective relay to correspondingly change the on-off state of a switch in the protective relay.
Drawings
Fig. 1 is a schematic diagram of an overall circuit structure of a dielectric barrier discharge circuit implemented in an embodiment.
Fig. 2 is a partially enlarged view of a portion i of the dielectric barrier discharge circuit implemented in an embodiment.
Fig. 3 is a partial enlarged view of a portion ii of the dielectric barrier discharge circuit implemented in an embodiment.
Fig. 4 is a partial enlarged view of a portion iii of a dielectric barrier discharge circuit implemented in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
please refer to fig. 1-4.
In this embodiment, a high-frequency high-voltage dielectric barrier discharge circuit is provided, which includes a main circuit and at least one load circuit; each load loop is connected with the main loop;
in this embodiment, the main circuit includes: for converting mains frequency into source frequency f0Source voltage U0The alternating square wave output power conversion module and the series resonance module;
specifically, the power conversion module comprises a rectification module M1, a filtering module M2, a voltage regulating module M3 and an inversion module M4, wherein the input end of the rectification module M1 is connected to an external power frequency commercial power, and the rectification module M1, the filtering module M2, the voltage regulating module M3 and the inversion module M4 are sequentially connected.
At the tail end of the inversion module, the main loop is further provided with a blocking capacitor C1 and a matching transformer T, the blocking capacitor C1 is arranged between the inversion module M4 and the matching transformer T, one end of the capacitor C1 is connected with one output end of the inversion module M4, the other end of the capacitor C1 is connected with one end of the primary side of the matching transformer T, and the other end of the primary side of the matching transformer T is connected with the other output end of the inversion module M4. And a reasonable turn ratio of the matching transformer T is set, so that the input impedance of the primary side of the matching transformer T is matched with the output impedance of the secondary side of the matching transformer T.
The series resonance module comprises a series resonance inductor L1 and a series resonance capacitor C2, the series resonance inductor L1 adopts a high-frequency inductor, the effective conductive area of the high-frequency inductor is considered, and meanwhile, the high-frequency inductor is made in a mode that a plurality of strands of enameled wires are twisted to form a hollow inductor conducting wire in order to avoid the influence of the skin effect of high-frequency current on the high-frequency inductor. The series resonant capacitor C2 is formed by connecting a plurality of single capacitors in series, and each single capacitor is a high-frequency capacitor with low dielectric loss, high rated voltage and high rated current. One end of the series resonant inductor L1 is connected to one end of the secondary side of the matching transformer T, the other end thereof is connected to one end of the series resonant capacitor C2, and the other end of the series resonant capacitor C2 is connected to the other end of the secondary side of the matching transformer T.
Two output ends are led out from two ends of the series resonance capacitor C2 to be used as output ends of the main loop, so that high-frequency high-voltage sine alternating current is stably output between the two output ends.
The main loop is used as the excitation of the circuit to drive the multi-path load loop.
Taking the first load circuit as An example, each load circuit includes a dielectric barrier discharge device (a1.. An) and a current-limiting capacitor (C31.. C3n), the current-limiting capacitor (C31.. C3n) is disposed between the dielectric barrier discharge device (a1.. An) and the series resonant capacitor C2, one end of the current-limiting capacitor (C31.. C3n) is connected to one of the output ends of the main circuit, the other end of the current-limiting capacitor (C31.. C3n) is connected to one of the discharge electrodes of the dielectric barrier discharge device (a1.. An), and the other discharge electrode of the dielectric barrier discharge device (a1.. An) is respectively connected to the other output end of the main circuit.
Further, in the circuit provided in this embodiment, each load circuit further includes a current sampler, a current comparator, a cut-off signal generator, and a protection relay (K1... Kn);
the protective relay (K1... Kn) is arranged between the dielectric barrier discharge device (A1.. An) and the series resonance capacitor (C31.. C3n), a first end of a switch in the protective relay (K1... Kn) is connected with a corresponding electrode of the dielectric barrier discharge device (A1.. An), and a second end of the switch in the protective relay (K1... Kn) is connected with a corresponding end of the series resonance capacitor (C31.. C3 n);
the current sampler obtains a current sampling signal at the common end of the protective relay and the series resonant capacitor in the form of current mutual inductance, the output end of the current sampler is connected with a current comparator, the other input end of the current comparator is recorded with an external given current value Igd, the output end of the current comparator is connected with a cut-off signal generator, and the output end of the cut-off signal generator is connected with a control iron core of the protective relay (K1... Kn).
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A high-frequency high-voltage dielectric barrier discharge circuit comprises a main loop and at least one load loop; each load loop is connected with the main loop; the main loop comprises: for converting mains supply to have active frequency f0Source voltage U0The alternating square wave output power conversion module;
the main loop is characterized by further comprising a series resonance module, wherein one end of the series resonance module is connected with one output end of the power conversion module, and the other end of the series resonance module is connected with the other output end of the power conversion module; each load loop is connected with the series resonance module in parallel;
the series resonance module has a natural resonance frequency f, and f is kept in the circuit when the circuit works0。
2. The high-frequency high-voltage dielectric barrier discharge circuit according to claim 1, wherein the series resonant module comprises a series resonant inductor and a series resonant capacitor, one end of the series resonant inductor is connected to one of the output terminals of the power conversion module, the other end of the series resonant inductor is connected to one end of the series resonant capacitor, and the other end of the series resonant capacitor is connected to the other output terminal of the power conversion module.
3. The high-frequency high-voltage dielectric barrier discharge circuit according to claim 2, wherein the power conversion module comprises a rectification module, a filtering module, a voltage regulating module and an inversion module, an input end of the rectification module is connected to an external power frequency mains supply, the rectification module, the filtering module, the voltage regulating module and the inversion module are connected in sequence, and an output between two output ends of the inversion module has a source frequency f0Source voltage U0Alternating ofA square wave.
4. The high frequency and high voltage dielectric barrier discharge circuit according to claim 3, wherein the main circuit further comprises a matching transformer, the matching transformer is disposed between the inverter module and the series inductor, two ends of a primary side of the matching impedance are connected to two output ends of the inverter module, one end of a secondary side of the matching transformer is connected to the series inductor, and the other end of the secondary side of the matching transformer is connected to the total series capacitor.
5. The high frequency high voltage dielectric barrier discharge circuit according to claim 4 wherein the primary side of the matching transformer in the primary loop has a total input impedance Z1The circuit is arranged on the secondary side of the matching transformer and has total output impedance Z2；
The matching transformer is provided with a turn ratio N, wherein the turn ratio is the ratio of the number of turns of the primary coil to the number of turns of the secondary coil; when the circuit is in operation, hold
6. The high frequency and high voltage dielectric barrier discharge circuit according to claim 5, wherein the main circuit further comprises a blocking capacitor, the blocking capacitor is disposed between the inverter module and the primary side of the matching transformer, one end of the blocking capacitor is connected to one of the output ends of the inverter module, and the other end of the blocking capacitor is connected to one of the primary sides of the matching transformer.
7. The high-frequency high-voltage dielectric barrier discharge circuit according to claim 2, wherein each of the load circuits includes a dielectric barrier discharge device, and two electrodes of the dielectric barrier discharge device are respectively connected to two ends of the series resonant capacitor.
8. The high frequency high voltage dielectric barrier discharge circuit according to claim 7, wherein each of the load circuits further includes a current limiting capacitor, the current limiting capacitor is disposed between the dielectric barrier discharge device and the series resonant capacitor, one end of the current limiting capacitor is connected to one end of the series resonant capacitor, and the other end of the current limiting capacitor is connected to a corresponding electrode of the dielectric barrier discharge device.
9. The high-frequency high-voltage dielectric barrier discharge circuit according to claim 8, wherein each of the load circuits further comprises a current sampler, a current comparator, a cut-off signal generator and a protective relay;
the protective relay is arranged between the dielectric barrier discharge device and the series resonance capacitor, a first end of a switch in the protective relay is connected with a corresponding electrode of the dielectric barrier discharge device, and a second end of the switch in the protective relay is connected with a corresponding end of the series resonance capacitor;
the current sampler with protective relay with the public end department of series resonance electric capacity obtains current sampling signal, the output of current sampler inserts current comparator, outside given current value is typeeed to another input of current comparator, current comparator's output is connected cut off signal generator, cut off signal generator's output is connected protective relay's control iron core.
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| CN202022943701.2U CN214626811U (en) | 2020-12-07 | 2020-12-07 | High-frequency high-voltage dielectric barrier discharge circuit |
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| CN202022943701.2U CN214626811U (en) | 2020-12-07 | 2020-12-07 | High-frequency high-voltage dielectric barrier discharge circuit |
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| CN214626811U true CN214626811U (en) | 2021-11-05 |
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