Marx high-voltage pulse power supply based on high-gain step-up dc-dc converter

Abstract

The application discloses a Marx high-voltage pulse power supply based on a high-gain boost type DC-DC converter, and the circuit is composed of an input DC power supply, two power switching tubes, a switching inductor and a cascaded Marx generator; the cascaded Marx generator can be expanded to n levels, and can be used in application occasions requiring high-voltage pulse power supplies, such as cancer treatment in medical treatment, water treatment, waste gas treatment, sterilization, electron and ion beam generation and acceleration, electrostatic dust removal and the like. Under the same working condition, the Marx high-voltage pulse power supply can realize high-gain pulses, and compared with the existing Marx high-voltage pulse power supply, can realize lower switching power loss and higher voltage gain. Meanwhile, the Marx high-voltage pulse power supply also has the advantages of simple topological structure, few modules, few electronic devices and low cost. Therefore, the Marx high-voltage pulse power supply has important economic value and practical engineering significance.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage pulse power supply technology, specifically relating to a Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter. Background Technology

[0002] High-gain Marx high-voltage pulse power supplies have received widespread attention and application in medical fields such as cancer treatment, water treatment, waste gas treatment, sterilization, electron and ion beam generation and acceleration, electrostatic dust removal, and other applications requiring high-voltage pulses. However, existing Marx high-voltage pulse power supplies have relatively low single-pole Marx voltage gain, requiring a high-voltage DC power supply or a large number of modules to obtain high-voltage pulses, resulting in increased consumption of electronic components and greater power loss of switching transistors.

[0003] Addressing the shortcomings of existing Marx high-voltage pulse power supplies, such as the need for a large number of modules and low voltage gain, constructing a Marx high-voltage pulse power supply with low switching power loss and high voltage gain has significant economic value and practical engineering implications. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter, which can achieve lower switching power loss and higher voltage gain.

[0005] This invention is achieved through the following technical solution:

[0006] A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter includes a switching inductor module, a switching transistor SL, a switching transistor Sc, and a generator module;

[0007] The switching inductor module includes diodes D1, D2, D3, inductors L1 and L2. Diode D1 and inductor L2 are connected in series in the forward direction, and inductor L2 is connected in series in the reverse direction with diode D2. The positive terminals of diode D1 and inductor L2 are connected in parallel and then connected to the positive terminal of the power supply Vin. The negative terminals of inductor L1 are connected in parallel with the negative terminals of diode D2. The negative terminal of diode D3 is connected between diode D1 and inductor L2, and the positive terminal of diode D3 is connected between the negative terminals of inductor L2 and diode D2.

[0008] The collector of the switching transistor SL is connected to the negative terminal of the diode D2, the emitter of the collector of the switching transistor SL is connected to the emitter of the switching transistor Sc, and is connected to the negative terminal of the power supply Vin. The collectors of the switching transistors SL and Sc are connected to the generator module, and the generator module is connected to the load RL.

[0009] Preferably, the generator module includes multiple cascaded Marx generators.

[0010] Preferably, the Marx generator includes diode D4, diode D5, capacitor C1, and switching transistor Si;

[0011] The positive terminal of diode D5 is connected to the collector of switching transistor Si, the negative terminal of diode D5 is connected to one end of capacitor C1, the other end of capacitor C1 is connected to the positive terminal of diode D4, the emitter of switching transistor Si is connected between capacitor C1 and the positive terminal of diode D4, and the negative terminal of diode D4 is connected to the collector of switching transistor Si.

[0012] Preferably, the switching transistors SL, SC, and Si are MOSFETs, IGBTs, or GaNFETs.

[0013] Preferably, when the switching transistor SL is turned on, the switching transistor Sc and the switching transistor Si of the generator module are turned off, and the inductors L1 and L2 are charged in parallel.

[0014] Preferably, when the switching transistor SL and the switching transistor Si of the generator module are turned off, the switching transistor SC is turned on, the diode D1 and the diode D2 are turned off, and the multiple capacitors of the generator module are charged in parallel by the inductors L1 and L2 and the input voltage Vin.

[0015] Preferably, when multiple capacitors are charged in parallel, the maximum voltage of the capacitors is as follows:

[0016]

[0017] Preferably, when the switching transistor SL is turned on, diodes D1 and D2 are turned on, the inductor is charged, the switching transistor of the generator module is turned on, and the capacitor discharges in series to the load and generates a high-voltage pulse.

[0018] Preferably, when the capacitors are discharged in series, the peak voltage is as follows:

[0019]

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] This invention relates to a Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter. It comprises two switching transistors, a switching inductor, and a cascaded Marx generator. Under the same operating conditions, this Marx high-voltage pulse power supply achieves high-gain pulses while simultaneously exhibiting lower switching power losses and higher voltage gain compared to existing Marx high-voltage pulse power supplies. Furthermore, it boasts advantages such as a simple topology and fewer electronic components.

[0022] Furthermore, this Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter has three operating modes in one switching cycle. In operating mode one, by controlling switch SL to be on and switches Sc and Si to be off, the input DC power supply Vin charges the switching inductor. In operating mode two, by controlling switches SL and Si to be off and switch SC to be on, the switching inductor charges the parallel capacitor. In operating mode three, by controlling switch SL to be on, the switching inductor charges, switch Si to be on, and the capacitor in series discharges to the load, generating a high-voltage pulse on the load, and switch SC... This invention only has three operating modes in the first switching cycle, and only modes two and three in subsequent switching cycles. Therefore, the operation of this invention is simple. The entire control process is simple, achieving high boost gain only through the on and off of the switches. Attached Figure Description

[0023] Figure 1 This is a topology diagram of a traditional Marx high-voltage pulse power supply;

[0024] Figure 2 This invention is an n-stage Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter;

[0025] Figure 3 This invention is a 4-stage Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter;

[0026] Figure 4 This is a schematic diagram of the working principle of the three working modes of the 4-stage Marx high-voltage pulse power supply based on the high-gain boost DC-DC converter of this invention;

[0027] (a) Switch SL is turned on, and switches Sc and Si are turned off; (b) Switch SL and Si are turned off, and switch SC is turned on; (c) Switch SL and Si are turned off, and switch SC is turned on.

[0028] Figure 5 This is a comparison of the simulated current and voltage waveforms of the high-gain Marx high-voltage pulse power supply and the Marx high-voltage pulse power supply of this invention.

[0029] (a) shows the simulated current and voltage waveforms of the present invention, and (b) shows the simulated current and voltage waveforms of the conventional method.

[0030] Figure 6 This is a comparison diagram of the output voltage of the high-gain Marx high-voltage pulse power supply of this invention. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These descriptions are intended to explain the invention and not to limit it.

[0032] See Figure 2-6 A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter includes a switching inductor module, a switching transistor SL, a switching transistor Sc, and a generator module;

[0033] The switching inductor module includes diodes D1, D2, D3, inductors L1 and L2. Diode D1 and inductor L2 are connected in series in the forward direction, and inductor L2 is connected in series in the reverse direction with diode D2. The positive terminals of diode D1 and inductor L2 are connected in parallel and then connected to the positive terminal of the power supply Vin. The negative terminals of inductor L1 are connected in parallel with the negative terminals of diode D2. The negative terminal of diode D3 is connected between diode D1 and inductor L2, and the positive terminal of diode D3 is connected between the negative terminals of inductor L2 and diode D2.

[0034] The collector of the switching transistor SL is connected to the negative terminal of the diode D2, the emitter of the collector of the switching transistor SL is connected to the emitter of the switching transistor Sc, and is connected to the negative terminal of the power supply Vin. The collectors of the switching transistors SL and Sc are connected to the generator module, and the generator module is connected to the load RL.

[0035] The generator module includes multiple cascaded Marx generators. The following description uses a single-pole Marx generator as an example. The Marx generator includes diode D4, diode D5, capacitor C1, and switching transistor Si.

[0036] The positive terminal of diode D5 is connected to the collector of switching transistor Si, the negative terminal of diode D5 is connected to one end of capacitor C1, the other end of capacitor C1 is connected to the positive terminal of diode D4, the emitter of switching transistor Si is connected between capacitor C1 and the positive terminal of diode D4, and the negative terminal of diode D4 is connected to the collector of switching transistor Si.

[0037] The switching transistors Sc, Si, and SL can be MOSFETs, IGBTs, or GaNFETs. This is just an example, not an exhaustive list, and is not a limitation; any other switching transistor capable of turning the circuit on or off can be used. The low-voltage terminals of both switching transistors S1 and SL are connected to the negative terminal of the input DC power supply Vin. The power switching transistor Si of this high-voltage pulse power supply is controlled by the same PWM control signal. This high-gain Marx high-voltage pulse power supply can achieve low switching power loss and high voltage gain.

[0038] See Figure 4 The working principle of the three working modes of the Marx high-voltage pulse power supply of the high-gain boost DC-DC converter provided by this invention will be explained in detail below.

[0039] 1. First working mode

[0040] like Figure 4 As shown in (a), the input DC power supply Vin charges the inductors, switch SL is turned on, and switches Sc and Si are turned off. Inductors L1 and L2 are charged in parallel by the input voltage source Vin. Inductors L1 and L2 have the same inductance value, and the inductor voltage satisfies the following equation:

[0041] V in =V L1 =V L2

[0042]

[0043]

[0044] At the end of the first working mode, t = D1T S At that time, the peak current of the inductor can be expressed as:

[0045]

[0046] 2. Second working mode

[0047] like Figure 4 As shown in (b), the capacitor charges during this stage. At this time, switching transistors SL and Si are off, switching transistor SC is on, and diodes D1 and D2 are off. The capacitor, connected in parallel, is charged by inductors L1 and L2 and the input voltage Vin. Diodes D3-D11 are on. The capacitance values ​​C1 = C2 = C3 = C4 = Ci. The capacitors charge to the same value Vcimax, and the charging time is the same as the inductor's discharge time. At time D2TS, the inductor discharge ends, the diodes turn off, and the capacitor charging also ends. The inductor current can be expressed as:

[0048]

[0049] Among them, C eq(par) =nC1, where n is the number of modules in the circuit.

[0050] Inductance in D2T S When the discharge ends, according to the above formula, D2 and the capacitor voltage can be calculated by the following formula:

[0051]

[0052]

[0053] Among them, f s Switching frequency

[0054] Capacitor voltage at D2T S The maximum voltage is reached at a certain time, and the calculation of the maximum voltage value is as follows:

[0055]

[0056] 3. The third working mode

[0057] like Figure 4 As shown in (c), the circuit generates a high-voltage pulse, turning on the switch SL, diodes D1 and D2, charging the inductor, turning on the switches S1-Sn, and discharging the capacitors in series to the load, generating a high-voltage pulse. The turn-on time of the switches S1-Sn is t = 5τ = 5RC. eq(ser) The switching transistor SC and diodes D3-D11 are turned off.

[0058] In the third operating mode, inductor charging and capacitor discharging occur simultaneously. The first operating mode only appears in the first cycle. In subsequent pulse cycles, only the second and third operating modes are present. Compared with the traditional Marx high-voltage pulse power supply, this circuit saves 5τ time per cycle.

[0059] The peak output voltage can be expressed as:

[0060]

[0061] The simulation is as follows

[0062] The simulation parameters are: DC input voltage V in =27V, output DC pulse voltage V o =1000V, switching frequency f S =50kHz, output power P o =193.5W.

[0063] Figure 5 (a) shows the simulated current and voltage waveforms of a traditional Marx high-voltage pulse power supply. Figure 5 (b) shows the simulated current and voltage waveforms of the high-gain Marx high-voltage pulse power supply of the present invention. As can be seen from the figure, at the same switching frequency and input voltage, the capacitor charging voltage and output voltage of the high-gain Marx high-voltage pulse power supply of the present invention are much greater than those of the conventional Marx high-voltage pulse power supply.

[0064] Figure 6 The figure shows a comparison of the experimental efficiency of the high-gain Marx high-voltage pulse power supply of this invention and a conventional Marx high-voltage pulse power supply. As can be seen from the figure, the high-gain Marx high-voltage pulse power supply of this invention has a higher output voltage with the same number of Marx stages.

[0065] This invention relates to a Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter. The circuit consists of an input DC power supply, two power switching transistors, a switching inductor, and a cascaded Marx generator. The cascaded Marx generator can be extended to n stages and can be used in applications requiring high-voltage pulse power, such as cancer treatment in medicine, water treatment, waste gas treatment, sterilization, electron and ion beam generation and acceleration, and electrostatic dust removal. Under the same operating conditions, this invention's Marx high-voltage pulse power supply achieves high-gain pulses while achieving lower switching power loss and higher voltage gain compared to existing Marx high-voltage pulse power supplies. It also has the advantages of simple topology, fewer modules, fewer electronic components, and lower cost. Therefore, this Marx high-voltage pulse power supply has significant economic value and practical engineering significance.

[0066] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter, characterized in that, Includes a switching inductor module, switching transistor SL, switching transistor Sc, and a generator module; The switching inductor module includes diodes D1, D2, and D3, inductors L1 and L2. The cathode of diode D1 is connected in series with the anode of inductor L1, and the cathode of inductor L2 is connected in series with the anode of diode D2. The anode of diode D1 is connected in parallel with the anode of inductor L2, and the cathode of inductor L1 is connected in parallel with the cathode of diode D2. The cathode of diode D3 is connected between the cathode of diode D1 and the anode of inductor L1, and the anode of diode D3 is connected between the cathode of inductor L2 and the anode of diode D2. The switching inductor module is connected to the power supply V. in Positive electrodes connected in series; The collector of the switching transistor SL is connected to the negative terminal of the diode D2, the emitter of the switching transistor SL is connected to the emitter of the switching transistor Sc, and is connected to the negative terminal of the power supply Vin. The collectors of the switching transistors SL and Sc are connected to the generator module, and the generator module is connected to the load RL.

2. The Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 1, characterized in that, The generator module includes multiple cascaded Marx generators.

3. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 2, characterized in that, The Marx generator includes diode D4, diode D5, capacitor C1, and switching transistor Si; The positive terminal of diode D5 is connected to the collector of switching transistor Si, the negative terminal of diode D5 is connected to one end of capacitor C1, the other end of capacitor C1 is connected to the positive terminal of diode D4, the emitter of switching transistor Si is connected between capacitor C1 and the positive terminal of diode D4, and the negative terminal of diode D4 is connected to the collector of switching transistor Si.

4. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 3, characterized in that, The switching transistors SL, SC, and Si are IGBTs.

5. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 1, characterized in that, When the switching transistor SL is turned on, the switching transistor Sc and the switching transistor Si of the generator module are turned off, and the inductors L1 and L2 are charged in parallel.

6. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 1, characterized in that, When the switching transistor SL and the switching transistor Si of the generator module are turned off, the switching transistor SC is turned on, and the diodes D1 and D2 are turned off. The multiple capacitors of the generator module are connected in parallel and charged by the inductors L1 and L2 and the input voltage Vin.

7. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 6, characterized in that, When multiple capacitors are connected in parallel and charged, the maximum voltage across the capacitors is as follows: 。 8. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 1, characterized in that, When the switching transistor SL is turned on, diodes D1 and D2 are turned on, the inductor is charged, the switching transistor of the generator module is turned on, and the capacitor discharges in series to the load and generates a high voltage pulse.

9. A Marx high-voltage pulse power supply based on a high-gain boost DC-DC converter according to claim 8, characterized in that, When the capacitors are discharged in series, the peak voltage is as follows: 。

Images