CN219458922U - High power factor bipolar pulse type power supply suitable for dielectric barrier discharge - Google Patents
High power factor bipolar pulse type power supply suitable for dielectric barrier discharge Download PDFInfo
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- CN219458922U CN219458922U CN202320041044.3U CN202320041044U CN219458922U CN 219458922 U CN219458922 U CN 219458922U CN 202320041044 U CN202320041044 U CN 202320041044U CN 219458922 U CN219458922 U CN 219458922U
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a high-power factor bipolar pulse power supply suitable for dielectric barrier discharge. The power supply consists of a passive power factor correction part and a bipolar high-frequency high-voltage pulse excitation voltage generation part. The power supply can provide bipolar excitation with high rise rate for the load, and can also enable the whole power supply to work under the conditions of high power factor and low harmonic distortion.
Description
Technical Field
The utility model particularly relates to a high-power factor bipolar pulse power supply suitable for dielectric barrier discharge.
Background
Dielectric barrier discharge (Dielectric Barrier Discharge, DBD) is a gas discharge phenomenon in which a low-temperature discharge plasma is generated in an air gap by inserting an insulating medium into the air gap between two metal electrodes. When alternating high-voltage excitation is applied between the high-voltage electrode and the low-voltage electrode of the DBD load and the breakdown voltage is reached, the gas in the air gap is broken down, and a large amount of charged particles are generated in the air gap. In recent years, dielectric barrier discharge technology has been widely used in the industrial fields of ozone gas generation, plasma displays, aerospace, and the like.
When the characteristics of the dielectric barrier discharge load structure and the discharge gas are determined, the discharge performance of the dielectric barrier discharge load is completely determined by the excitation of the power supply circuit. A great deal of research shows that compared with sinusoidal excitation, high-voltage pulse excitation with high voltage rising rate and intermittent time can not only improve the discharge uniformity of the load, but also reduce the power consumption to generate more active particles so as to greatly improve the working performance of the DBD load. Although the cascade multilevel circuit, the power supply based on the magnetic compression principle and the pulse circuit represented by the Marx circuit can realize high rise rate of load excitation, when the pulse circuit is applied to higher pulse voltage, the number of required circuit stages is increased, the number of switches is increased in multiple, the corresponding trigger circuit and isolation technology are complicated, and the system reliability is greatly reduced.
Therefore, it is necessary to design a high power factor bipolar pulse power supply suitable for dielectric barrier discharge, which can provide not only excitation with a high rising rate for a load but also can fully exert the performance of a DBD load by including an intermittent time in the excitation. The bipolar high-frequency high-voltage pulse excitation voltage part is of a current source structure, so that uncontrollable voltage spikes on the DBD load can be avoided. In addition, the power supply not only can realize power correction in AC input test, but also can realize power switch tube Q 1 And Q 2 The common ground, the same driving signal and half period of phase difference can realize soft switching, so the power supply has low circuit loss, simple structure and easy controlIs characterized by (1).
Disclosure of Invention
The utility model aims to solve the technical problem of providing a bipolar pulse power supply with high power factor, which is applicable to dielectric barrier discharge, and the bipolar pulse power supply is simple in structure and easy to control, can provide bipolar excitation with high rise rate for a load, and can enable the whole power supply to work in a state with high power factor and low harmonic distortion.
The technical proposal of the utility model is as follows:
a high power factor bipolar pulse power supply suitable for dielectric barrier discharge, comprising: the power frequency alternating current power supply comprises a power frequency alternating current power supply, a first diode, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a first power switch tube, a second power switch tube and a step-up transformer; the first end of the alternating current power supply is respectively connected with the anode of the first diode and the cathode of the third diode; the second end of the alternating current power supply is respectively connected with the anode of the second diode and the cathode of the fourth diode; the cathode of the first diode is respectively connected with the cathode of the second diode, the first end of the first inductor and the first end of the second inductor; the second end of the first inductor is respectively connected with the second end of the first power switch tube and the first end of the primary coil of the step-up transformer; the second end of the second inductor is respectively connected with the second end of the second power switch tube and the second end of the primary coil of the step-up transformer; the secondary side coil of the step-up transformer is connected with a dielectric barrier discharge load; the anode of the third diode, the anode of the fourth diode, the first end of the first power switch tube and the first end of the second power switch tube are connected.
Optionally, the first inductance and the second inductance are equal in value.
Optionally, the first power switch tube and the second power switch tube are the same in model.
Optionally, the working frequencies of the first power switch tube and the second power switch tube are equal, and the driving signals of the first power switch tube and the driving signals of the second power switch tube have overlapping time.
Optionally, the working frequencies of the first power switch tube and the second power switch tube are equal, the duty ratios of the driving signals of the first power switch tube and the driving signals of the second power switch tube are equal, and an overlapping interval exists; the overlapping interval is determined by the main loop parameter of the power supply and the parameter of the dielectric barrier discharge load, and the duty ratio of the driving signal of the first power switch tube and the driving signal of the second power switch tube is generally not lower than 51% and not higher than 60%.
Optionally, the first power switch tube and the second power switch tube are NMOS; the first end of the first power switch tube and the first end of the second power switch tube are both NMOS drain electrodes, and the second end of the first power switch tube and the second end of the second power switch tube are both NMOS source electrodes.
The beneficial effects are that:
(1) The bipolar high-frequency high-voltage pulse excitation voltage generation part can provide bipolar high-frequency pulse excitation voltage with high rising rate and high falling rate for the DBD load, and the excitation waveform contains intermittent time, so that the performance of the DBD load is improved.
(2) The bipolar high-frequency high-voltage pulse excitation voltage generation part is of a current source structure, so that uncontrollable voltage spikes on a DBD load can be avoided.
(3) Switch tube Q 1 And Q 2 Can realize soft switching and Q 1 And Q 2 Common ground, the driving circuit is simple to realize, and Q 1 And Q 2 The driving signals of the driving signals are identical, the phase difference is 180 degrees, and the driving signals are easy to realize.
(4) The organic combination of the power factor correction circuit and the load excitation voltage generation circuit is realized, the power factor is improved in the AC input test, and the circuit harmonic wave is reduced.
(5) The load voltage rising rate is not affected by the working frequency, the voltage waveform of the load is not changed due to the change of circuit parameters, and the circuit has the advantages of good stability and high reliability.
(6) The power supply is composed of a group of rectifier bridges, two inductors, two switching tubes and a boost transformer, and is simple in structure.
Drawings
Fig. 1 is a diagram of a power supply structure of the present disclosure.
Fig. 2 is a dielectric barrier discharge load equivalent model diagram.
Fig. 3 is an equivalent circuit diagram of the bipolar high-frequency high-voltage pulse excitation voltage generation section.
Fig. 4 is an operation waveform diagram of the bipolar high-frequency high-voltage pulse excitation voltage generation section.
Fig. 5 is an equivalent circuit diagram of each mode in the first half cycle.
Fig. 6 is a schematic diagram of a passive pfc part equivalent circuit of an ac input test.
Fig. 7 is a waveform diagram of the passive pfc portion of the ac input test.
Fig. 8 is a set of load voltage current waveforms for given parameters.
Wherein: wherein AC is power frequency alternating current power supply, diode D 1 -D 4 An uncontrollable rectifier bridge and two inductors L 1 And L 2 Forms a passive power factor correction part, a power switch tube Q 1 And Q 2 And two inductances L 1 And L 2 And the step-up transformer T constitutes a bipolar high-frequency high-voltage pulse excitation voltage generation section. i.e DBD Current flowing through the load, u DBD Is the voltage on the DBD load.
Detailed Description
The present utility model will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown, for the purpose of illustrating the utility model, but the scope of the utility model is not limited to the specific embodiments shown.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present utility model.
Example 1:
fig. 1 is a topological structure diagram of a high power factor bipolar pulse power supply suitable for dielectric barrier discharge, which is provided by the utility model, and comprises the following components: the power frequency alternating current power supply comprises a power frequency alternating current power supply, a first diode, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a first power switch tube, a second power switch tube and a step-up transformer. The first end of the alternating current power supply is respectively connected with the anode of the first diode and the cathode of the third diode; the second end of the alternating current power supply is respectively connected with the anode of the second diode and the cathode of the fourth diode; the cathode of the first diode is respectively connected with the cathode of the second diode, the first end of the first inductor and the first end of the second inductor; the second end of the first inductor is respectively connected with the second end of the first power switch tube and the first end of the primary coil of the step-up transformer; the second end of the second inductor is respectively connected with the second end of the second power switch tube and the second end of the primary coil of the step-up transformer; the secondary side coil of the step-up transformer is connected with a dielectric barrier discharge load; the anode of the third diode, the anode of the fourth diode, the first end of the first power switch tube and the first end of the second power switch tube are connected.
Fig. 3 is an equivalent circuit diagram of the bipolar high-frequency high-voltage pulse excitation voltage generation section. Wherein I is CD1 And I CD2 Respectively flow through large inductances L 1 And L 2 Current source formed by equivalent current of L S1 And L S2 Primary side leakage reactance and secondary side leakage reactance of the transformer respectively, L m The transformer exciting inductance is obtained by the transformation ratio of the secondary side to the primary side of the transformer is N, C e And R is e Respectively DBD load equivalent capacitance and equivalent resistance, i DBD Current flowing through the load, u DBD Is the voltage on the DBD load.
The working process of the part can be divided into a first half period and a second half period, and the following is briefly described: in the first half period, switch tube Q 1 And Q 2 Simultaneously conducting transformerIn a short circuit state, the inductance of the transformer and the load form a resonant circuit, and the energy stored in the transformer is released to the DBD load. In this stage, the DBD load voltage rises sharply due to the small leakage reactance of the transformer and the equivalent capacitance value of the DBD load. Thereafter, switch tube Q 1 Turn off, DC current source I CD1 Supplying energy to the load via a transformer, a DC current source I CD2 Still in a short circuit state, the load voltage changes slowly due to the large exciting inductance of the transformer. The operation of the second half-cycle is the same as the operation of the first half-cycle, but the excitation voltage generated in the load is of opposite polarity. Fig. 4 is an operation waveform of the bipolar high-frequency high-voltage pulse excitation voltage generating section provided by the present utility model.
Specifically, the half working period of the bipolar high-frequency high-voltage pulse excitation voltage generation part provided by the utility model can be divided into two modes, namely mode 1 (t 0 -t 1 ) Modality 2 (t) 1 -t 2 ). Fig. 5 is an equivalent circuit diagram of two working modes in a half working period of the bipolar high-frequency high-voltage pulse excitation voltage generation part provided by the utility model.
Here power switch tube Q is set 1 And Q 2 And the switching period of (2) is T, and the duty ratio is D. Two inductances L 1 And L 2 The value is extremely large, switch tube Q 1 And Q 2 Diode D 1 -D 4 Are all ideal switching devices.
As can be taken from fig. 5, constraint equations of modality 1 and modality 2 are respectively:
substituting initial values in two modes into the electric quantity expressions in each mode can be respectively as follows:
when the switch tube Q 2 When the current on the current is reduced to 0, the mode 1 ends, so that the expression of the duration and the end time of each mode can be obtained:
wherein L is S ＝L S2 +L S1 *N 2 ，U L 、U C And U R Respectively L in equivalent circuits S 、C e And R is e Voltage on mode 1 load current initial value i 0 U and U C Initial value U C (t 0 )＝u 0 Initial value of modality 2U C (t 1 )＝u 1 ，i DBD (t 1 )＝i 1 ＝I，i DBD Is the current that flows through the load and,
voltage peak:
from mode 2, it is known that when the resonant current of the DBD load passes through the zero point, the voltage of the DBD load reaches its peak value U m The method comprises the following steps:
when the circuit parameters, the parameters of the transformer and the load are determined, the resonant frequencies of mode 1 and mode 2 are also determined, and are not changed due to the change of the switching period, and the inductance L 1 And L 2 Is irrelevant, and at the same time limits the switching frequency and the duty ratioSetting. Taking into account the recovery time T required after the end of the DBD load discharge D The range of switching frequencies can thus be determined:
the range of values of the duty cycle of the driving signal of the power switching device:
fig. 6 is an equivalent circuit diagram of a power factor correction part provided by the present utility model, in which the resistor R is an equivalent resistor of a bipolar high-frequency high-voltage pulse excitation voltage generating part and a DBD load, and l=l 1 ||L 2 ，u in Is an alternating input voltage, i in Input current, i L Is flowing through inductance L 1 And L 2 Is set in the above-described range). Fig. 7 is a waveform diagram showing the operation of the pfc part according to the present utility model. The method can be as follows:
effective value of current flowing through L:
power factor of ac input test:
power dissipated across equivalent resistance:
the specific implementation steps of the circuit element parameter determination and the circuit topology control are as follows, wherein reference numerals of the circuit elements refer to fig. 1:
1. off-line measuring equivalent capacitance C of dielectric barrier discharge load e Equivalent electricityR resistance e And breakdown voltage V of dielectric barrier discharge load th ；
2. Depending on the resonant frequency of the load loop and the highest voltage peak U that the dielectric barrier discharge load can withstand m Parameters of the step-up transformer and the transformation ratio N are determined.
3. And obtaining the power consumed by the DBD load during discharging offline, and deducing the equivalent resistance of the bipolar high-frequency high-voltage pulse excitation voltage generation part.
4. Determining a first inductance L according to parameters of an equivalent circuit and requirements of a passive power factor correction part 1 And a second inductance L 2 Is a numerical value of (2).
5. The duty cycle of the driving pulse is set according to the resonance frequency determined by the load parameter and the transformer parameter, and is typically set to 53%, and the driving pulse of the first power switch tube lags or leads the driving pulse of the second power switch tube by half a period.
6. The frequency range of the driving pulse is set according to the resonance frequency determined by the load capacitance and the transformer inductance, and the first power switch tube Q is provided that the frequency and the circuit parameters are proper 1 And a second power switch tube Q 2 Soft switching can be realized.
In accordance with the design principles described above, a set of circuit typical parameters are given below:
AC voltage AC:0-250V (adjustable);
inductance L 1 ：10mH；
Inductance L 2 ：10mH；
Transformer T: rated frequency 125kHz, primary side leakage inductance L S1 1.4 mu H, secondary leakage inductance L S2 4.75mH, excitation inductance L m 312 μh, the turns ratio of primary to secondary of the transformer n=9: 450, respectively;
driving Pulse1: frequency 125kHz, duty cycle 53%;
driving Pulse2: frequency 125kHz, duty cycle 53%, lagging Pulse1 half cycle;
a waveform of the load voltage and current for this set of parameters is shown in fig. 8.
Claims (6)
1. A high power factor bipolar pulse power supply suitable for dielectric barrier discharge, comprising: the power frequency alternating current power supply comprises a power frequency alternating current power supply, a first diode, a second diode, a third diode, a fourth diode, a first inductor, a second inductor, a first power switch tube, a second power switch tube and a step-up transformer; the first end of the alternating current power supply is respectively connected with the anode of the first diode and the cathode of the third diode; the second end of the alternating current power supply is respectively connected with the anode of the second diode and the cathode of the fourth diode; the cathode of the first diode is respectively connected with the cathode of the second diode, the first end of the first inductor and the first end of the second inductor; the second end of the first inductor is respectively connected with the second end of the first power switch tube and the first end of the primary coil of the step-up transformer; the second end of the second inductor is respectively connected with the second end of the second power switch tube and the second end of the primary coil of the step-up transformer; the secondary side coil of the step-up transformer is connected with a dielectric barrier discharge load; and the anode of the third diode and the anode of the fourth diode are connected with the first end of the first power switch tube and the first end of the second power switch tube.
2. The high power factor bipolar pulsed power supply suitable for dielectric barrier discharge of claim 1, wherein said first inductance and said second inductance are equal in value.
3. The high power factor bipolar pulsed power supply suitable for dielectric barrier discharge of claim 2, wherein said first power switch tube and said second power switch tube are of the same type.
4. The high power factor bipolar pulse power supply suitable for dielectric barrier discharge as claimed in claim 3, wherein said first power switch tube and said second power switch tube have equal operating frequencies and overlap time exists between said first power switch tube driving signal and said second power switch tube driving signal.
5. The high power factor bipolar pulse power supply suitable for dielectric barrier discharge according to claim 4, wherein the working frequencies of the first power switch tube and the second power switch tube are equal, the duty ratios of the driving signals of the first power switch tube and the driving signals of the second power switch tube are equal, and an overlapping interval exists; the overlapping interval is determined by the main loop parameter of the power supply and the parameter of the dielectric barrier discharge load, and the duty ratio of the driving signal of the first power switch tube and the driving signal of the second power switch tube is generally not lower than 51% and not higher than 60%.
6. The high power factor bipolar pulse power supply suitable for dielectric barrier discharge according to claim 4, wherein the first power switch tube and the second power switch tube are both NMOS, wherein the first end of the first power switch tube and the first end of the second power switch tube are both drains of NMOS, and the second end of the first power switch tube and the second end of the second power switch tube are both sources of NMOS.
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