A bipolar pulse driving circuit and device for a dielectric barrier discharge load

Abstract

The present invention discloses a bipolar pulse driving circuit and device for a dielectric barrier discharge load. The bipolar pulse current source type driving circuit disclosed by the present invention is composed of a DC voltage loop, a current pulse generation and energy feedback loop, a dielectric barrier discharge load and a load energy feedback loop. The topology disclosed by the present invention not only has the advantages of energy feedback, low voltage withstand of circuit elements and low circuit loss, but also can adjust the circuit state according to load parameters to ensure that the dielectric barrier discharge load operates in an optimal state.

Description

Technical Field

[0001] The present invention relates to the field of special power supplies in power electronics, and particularly to a bipolar pulse driving circuit and device for dielectric barrier discharge. Background Art

[0002] Dielectric Barrier Discharge is a form of non-equilibrium gas discharge in which an insulating dielectric layer is added to the discharge gap, and it appears capacitive externally. Due to the maturity of voltage source inverter power supply technology, most dielectric barrier loads use voltage source power supply at the present stage. However, it is found in actual applications that when a voltage source inverter power supply is applied to a DBD load, a current spike will occur at the moment of discharge of the DBD load. This current spike will cause the circuit protection action at least, and may even lead to circuit damage and the collapse of the entire system at worst. In addition, recent research shows that when a DBD load is powered by a current source inverter power supply, the efficiency of the load is generally better than that when powered by a voltage source power supply. However, the current source type inverter circuit applied to dielectric barrier loads at present has deficiencies such as high voltage withstand of components and inability to feedback circuit energy. For this reason, the present invention proposes a bipolar pulse current source circuit topology suitable for dielectric barrier discharge loads. This circuit topology not only has the advantages of energy feedback, low voltage withstand of circuit components, and low circuit loss, but also can adjust the circuit state according to load parameters to ensure that the dielectric barrier discharge load operates in an optimal state. Summary of the Invention

[0003] The purpose of the present invention is to disclose a bipolar pulse current source circuit on the basis of considering the above problems. The circuit structure disclosed by the present invention is simple and has the advantages of energy feedback, low voltage withstand of circuit components, and low circuit loss. In addition, this circuit structure can also adjust the circuit state according to load parameters to ensure that the dielectric barrier discharge load operates in an optimal state.

[0004] The purpose of the present invention is realized by the following technical solutions:

[0005] A bipolar pulse driving circuit and device for a dielectric barrier discharge load, mainly characterized by comprising a DC voltage loop, a current pulse generation and energy feedback loop, a capacitive load, and a load energy feedback loop.

[0006] Optionally, the DC voltage loop is composed of a DC voltage source Vdc, a first inductor L1, a first diode D1, a first capacitor C1, and a second capacitor C2, where: the positive pole of the DC voltage source Vdc is connected to the left end of the first inductor L1, the right end of the first inductor L1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the first capacitor C1, the cathode of the first capacitor C1 is connected to the anode of the second capacitor C2, and the cathode of the second capacitor C2 is connected to the negative pole of the DC voltage source Vdc;

[0007] Optionally, the current pulse generation and energy feedback circuit is composed of a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, an eighth diode D8, a ninth diode D9, a first power switch V1, a second power switch V2, a third power switch V3, a fourth power switch V4, a first transformer T1, and a second transformer T2. The anode of the second diode D2 is connected to the anode of the first capacitor Cl. The cathode of the second diode D2 is connected to the drain of the first power switch V1. The source of the first power switch V1 is connected to the same-name terminal of the primary side of the first transformer T1. The non-same-name terminal of the primary side of the first transformer T1 is connected to the drain of the third power switch V3. The source of the third power switch V3 is connected to the cathode of the second capacitor. The anode of the fifth diode D5 is connected to the non-same-name terminal of the primary side of the first transformer T1. The cathode of the fifth diode D5 is connected to the anode of the second diode D2. The anode of the third diode D3 is connected to the non-same-name terminal of the secondary side of the first transformer T1. The cathode of the second diode D2 is connected to the drain of the second power switch V2. The source of the second power switch V2 is connected to the same-name terminal of the primary side of the second transformer T2. The non-same-name terminal of the primary side of the second transformer T2 is connected to the drain of the fourth power switch V4. The source of the fourth power switch V4 is connected to the cathode of the second capacitor C2. The anode of the eighth diode D8 is connected to the non-same-name terminal of the primary side of the second transformer T2. The cathode of the eighth diode D8 is connected to the anode of the second diode D2. The anode of the ninth diode D9 is connected to the source of the fourth power switch V4. The cathode of the ninth diode D9 is connected to the same-name terminal of the primary side of the second transformer T2. The same-name terminal of the secondary side of the second transformer T2 is connected to the cathode of the fourth diode D4.

[0008] Optionally, the load energy feedback circuit includes a seventh diode D7, a third capacitor C3, and a fourth capacitor C4. The cathode of the seventh diode D7 is connected to the cathode of the first capacitor. The anode of the seventh diode D7 is connected to the anode of the third capacitor C3. The cathode of the third capacitor C3 is connected to the anode of the fourth capacitor C4. The cathode of the fourth capacitor C4 is connected to the cathode of the second capacitor C2. The anode of the third capacitor C3 is connected to the cathode of the third diode D3. The cathode of the fourth capacitor C4 is connected to the anode of the fourth diode D4.

[0009] Optionally, the anode of the dielectric barrier discharge load is connected to the cathode of the third capacitor C3. The cathode of the dielectric barrier discharge load is connected to the same-name terminal of the secondary side of the first transformer T1 and the non-same-name terminal of the secondary side of the second transformer T2.

[0010] Optionally, the effective value of the DC voltage source Vdc can be adjusted according to the actual application, the values of the first inductor L and the first capacitor C1 of the numerical circuit can be adjusted according to the filtering requirements, and the first capacitor C1 and the second capacitor C2 of the voltage dividing circuit are adjusted simultaneously according to the voltage dividing requirements.

[0011] Optionally, the first power switch V1, the second power switch V2, the third power switch V3, and the fourth power switch V4 have the same parameters, the fifth diode D5, the sixth diode D6, the eighth diode D8, and the ninth diode D9 have the same parameters, the third diode D3 and the fourth diode D4 have the same parameters, the breakdown voltage requirements of the third diode D3 and the fourth diode D4 are higher than those of the fifth diode D5, and the first transformer T1 and the second transformer T2 have the same parameters.

[0012] Optionally, the first power switch V1 and the third power switch V3 are controlled by the same drive pulse PWM1 with a duty cycle lower than 50%, the second power switch V2 and the fourth power switch V4 are controlled by the same drive pulse PWM2 with a duty cycle lower than 50%, the duty cycles of the drive pulse PWM1 and the drive pulse PWM2 are the same, and the drive pulse PWM2 lags or leads the drive pulse PWM1 by half a cycle.

[0013] Optionally, the third capacitor C3 and the fourth capacitor C4 have the same parameters, and the values of the third capacitor C3 and the fourth capacitor C4 are determined according to the equivalent circuit value of the dielectric barrier load according to the voltage dividing requirements;

[0014] Optionally, a bipolar pulse driving device for a dielectric barrier discharge load is characterized by including a processor and a memory;

[0015] The memory is used to store program codes and transmit the program codes to the processor;

[0016] The processor is used to generate pulse signals of the power switches V1-V4 according to the instructions in the program codes.

[0017] The advantages of the present invention compared with the prior art are as follows:

[0018] (1) It solves the deficiency that the conventional power supply generates current spikes at the moment of discharge of the DBD load;

[0019] (2) The excitation applied to the DBD load is pulse excitation, and the load has high product generation efficiency; the high-voltage side diodes of the pulse generation circuit have low breakdown voltage;

[0020] (3) The remaining energy on the DBD load side can be fed back to the DC energy storage capacitor, and the overall power supply has high efficiency; Description of the Drawings

[0021] Figure 1This is the circuit structure diagram disclosed by the present invention.

[0022] Figure 2 This is the equivalent model diagram of the dielectric barrier discharge load.

[0023] Figure 3 This is the waveform diagram of the voltage across and the current flowing through the dielectric barrier discharge load when no discharge occurs.

[0024] Figure 4 This is the waveform diagram of the voltage across and the current flowing through the dielectric barrier discharge load when discharge occurs. Specific embodiments

[0025] The specific implementation steps for determining the circuit element parameters and controlling the circuit topology are as follows. For the reference of circuit element labels, see Figure 1 :

[0026] 1. Measure offline the total capacitance C of the dielectric barrier discharge load when no discharge occurs DBD , and the discharge sustaining voltage V of the dielectric barrier discharge load th ;

[0027] 2. Determine the resonant angular frequency ω of the load circuit according to the resonant circuit where the secondary winding of the transformer is located, and determine the inductance of the secondary winding of the transformer, the turns ratio n = N1 / N2 of the primary and secondary coils of the transformer, and the voltage value of the DC voltage source Vdc;

[0028] 3. Determine the values of the first capacitor C1 and the second capacitor C2 according to the voltage regulation and voltage division requirements of the circuit;

[0029] 4. Determine the inductance value of L1 according to the resonant angular frequency ω0 required by the resonant circuit where the first inductor L1 is located;

[0030] 5. Determine the values of the third capacitor C3 and the fourth capacitor C4 according to the resonant frequency of the resonant circuit;

[0031] 6. Determine the conduction time ranges of the power switch tubes V1 and V3 according to the voltage change rate of the secondary side of the first transformer T1; determine the conduction time ranges of the power switch tubes V2 and V4 according to the voltage change rate of the secondary side of the second transformer T2. Among them, the conduction states of the power switch tubes V1 and V3 are the same, the conduction states of the power switch tubes V2 and V4 are the same, V1 and V3 lag behind each other by half a cycle, and the conduction duty ratio of each power switch tube is less than 50%;

[0032] According to the above design principles, a set of typical circuit parameters are given below:

[0033] DC voltage source Vdc: 435V

[0034] Inductor L1: 0.5mH;

[0035] Capacitor C1: 470 uF;

[0036] Capacitor C2: 470 uF;

[0037] Capacitor C3: 1254 pF;

[0038] Capacitor C4: 1254 pF;

[0039] Capacitor C5: 66 pF;

[0040] Transformer T1: Rated frequency 50 kHz, rated primary voltage 435 V, rated secondary voltage 5000 V, turns ratio 11.5;

[0041] Transformer T2: Rated frequency 50 kHz, rated primary voltage 435 V, rated secondary voltage 5000 V, turns ratio 11.5;

[0042] The drive signals applied to power switching transistors V1 and V3 are the same, with a drive signal frequency of 50 kHz and a duty cycle of 30%;

[0043] The drive signals applied to power switching transistors V2 and V4 are the same, lagging behind the drive signal of V1 by 0.02 ms, with a drive signal frequency of 50 kHz and a duty cycle of 30%;

[0044] Under this set of parameters, the circuit operating waveforms are as shown in the appendix Figure 4 as follows.

Claims

1. A bipolar pulse driving circuit for a dielectric barrier discharge load, characterized in that The drive circuit consists of a DC voltage loop, a current pulse generation and energy feedback loop, a load energy feedback loop, and a dielectric barrier load; The DC voltage loop consists of a DC voltage source Vdc, a first inductor L1, a first diode D1, a first capacitor C1, and a second capacitor C2. Among them: the positive pole of the DC voltage source Vdc is connected to the left end of the first inductor L1, the right end of the first inductor L1 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the first capacitor C1, the cathode of the first capacitor C1 is connected to the anode of the second capacitor C2, and the cathode of the second capacitor C2 is connected to the negative pole of the DC voltage source Vdc; The current pulse generation and energy feedback loop consists of a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, an eighth diode D8, a ninth diode D9, a first power switch V1, a second power switch V2, a third power switch V3, a fourth power switch V4, a first transformer T1, and a second transformer T2. The anode of the second diode D2 is connected to the anode of the first capacitor C1, the cathode of the second diode D2 is connected to the drain of the first power switch V1, the source of the first power switch V1 is connected to the primary side's same-name terminal of the first transformer T1, the non-same-name terminal of the primary side of the first transformer T1 is connected to the drain of the third power switch V3, the source of the third power switch V3 is connected to the cathode of the second capacitor, the anode of the fifth diode D5 is connected to the non-same-name terminal of the primary side of the first transformer T1, the cathode of the fifth diode D5 is connected to the anode of the second diode D2, the anode of the third diode D3 is connected to the non-same-name terminal of the secondary side of the first transformer T1, the cathode of the second diode D2 is connected to the drain of the second power switch V2, the source of the second power switch V2 is connected to the primary side's same-name terminal of the second transformer T2, the non-same-name terminal of the primary side of the second transformer T2 is connected to the drain of the fourth power switch V4, the source of the fourth power switch V4 is connected to the cathode of the second capacitor C2, the anode of the eighth diode D8 is connected to the non-same-name terminal of the primary side of the second transformer T2, the cathode of the eighth diode D8 is connected to the anode of the second diode D2, the anode of the ninth diode D9 is connected to the source of the fourth power switch V4, the cathode of the ninth diode D9 is connected to the primary side's same-name terminal of the second transformer T2, and the same-name terminal of the secondary side of the second transformer T2 is connected to the cathode of the fourth diode D4.

2. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 1, wherein The load energy feedback circuit is composed of a seventh diode D7, a third capacitor C3, and a fourth capacitor C4; the cathode of the seventh diode D7 is connected to the cathode of the first capacitor, the anode of the seventh diode D7 is connected to the anode of the third capacitor C3, the cathode of the third capacitor C3 is connected to the anode of the fourth capacitor C4, the cathode of the fourth capacitor C4 is connected to the cathode of the second capacitor C2, the anode of the third capacitor C3 is connected to the cathode of the third diode D3, and the cathode of the fourth capacitor C4 is connected to the anode of the fourth diode D4.

3. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 2, characterized in that The anode of the dielectric barrier load is connected to the cathode of the third capacitor C3, the cathode of the dielectric barrier load is connected to the same-name end of the secondary side of the first transformer T1, and the cathode of the dielectric barrier load is connected to the non-same-name end of the secondary side of the second transformer T2.

4. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 1, characterized in that The effective value of the DC voltage source Vdc can be adjusted according to actual applications, the values of the first inductor L and the first capacitor C1 can be adjusted according to filtering requirements, and the first capacitor C1 and the second capacitor C2 can be adjusted simultaneously according to voltage division requirements.

5. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 1, characterized in that The first power switch tube V1, the second power switch tube V2, the third power switch tube V3, and the fourth power switch tube V4 have the same parameters, the fifth diode D5, the sixth diode D6, the eighth diode D8, and the ninth diode D9 have the same parameters, the third diode D3 and the fourth diode D4 have the same parameters, the voltage withstand requirements of the third diode D3 and the fourth diode D4 are higher than those of the fifth diode D5, and the first transformer T1 and the second transformer T2 have the same parameters.

6. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 1, characterized in that The first power switch tube V1 and the third power switch tube V3 are controlled by a driving pulse PWM1 with a duty cycle lower than 50%, the second power switch tube V2 and the fourth power switch tube V4 are controlled by a driving pulse PWM2 with a duty cycle lower than 50%, the duty cycles of the driving pulse PWM1 and the driving pulse PWM2 are the same, and the driving pulse PWM2 lags or leads the driving pulse PWM1 by half a cycle.

7. The bipolar pulse driving circuit for a dielectric barrier discharge load according to claim 2, characterized in that The third capacitor C3 and the fourth capacitor C4 have the same parameters, and the values of the third capacitor C3 and the fourth capacitor C4 are determined according to the equivalent circuit value of the dielectric barrier load and the voltage division requirements.

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