High-performance driving circuit for solid-state Marx generator

Abstract

A high-performance driving circuit for a solid-state Marx generator relates to the technical field of pulse power, and comprises a half-bridge driving circuit, a coaxial string core magnetic ring and a gate pole integrated trigger circuit, a driving circuit signal of the solid-state Marx generator is generated by a digital processor and then enters the half-bridge driving circuit, and a driving circuit signal of the solid-state Marx generator enters the gate pole integrated trigger circuit. The half-bridge driving circuit amplifies a control signal and then outputs the control signal to the primary side of the coaxial series core magnetic ring, the secondary side of the coaxial series core magnetic ring is connected with the gate pole integrated trigger circuits, and the output end of each level of gate pole integrated trigger circuit is connected to the grid electrode of a solid state Marx generator switch tube needing to be driven; compared with traditional optical fiber driving or transformer driving, the system loss and cost are reduced, the electromagnetic compatibility of the system is improved, and the requirement that a traditional driving chip needs each stage of independent isolation power supply for a secondary side signal is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pulse power, in particular to a high-performance driving circuit for a solid-state Marx generator. Background Art

[0002] As is known, with the development of pulse power technology, semiconductor switches are widely used in pulse power generators. Solid-state Marx generators using semiconductor switches are widely used in environmental protection, medical, food and chemical industry applications because their parameters such as voltage, pulse width, frequency and amplitude are continuously adjustable and their energy utilization rate is higher. For example, they are used in the production of ozone, the change of material properties, the treatment of biological cells, the disposal of organic waste sludge, the generation of low-temperature plasma, etc.

[0003] All solid-state Marx generators have many requirements for their driving circuits, such as good synchronization of driving signals at different stages, good isolation of control signals from the main circuit, adjustable pulse width and frequency, good driving capability, etc.; today's traditional optical fiber drive or transformer drive circuits require separate isolated power supply for each stage of secondary side drive, resulting in high cost, large number of power supplies, large size, increased system loss and reduced electromagnetic compatibility performance of the overall system, limiting the widespread application of solid-state Marx generators. Utility Model Content

[0004] In order to overcome the deficiencies in the background technology, the utility model discloses a high-performance driving circuit for a solid-state Marx generator.

[0005] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0006] The first aspect of the utility model provides a driving circuit for a solid-state Marx generator, comprising: a half-bridge driving circuit, a coaxial series core magnetic ring and a gate integrated trigger circuit:

[0007] The half-bridge driving circuit includes: a digital processor, a driving chip IR2110, current limiting resistors R1-R5, voltage stabilizing diodes D1-D1, two switching tubes Sd1 and Sd2, and capacitors C1-C3.

[0008] The specific working mode of the half-bridge driving circuit is: the digital processor generates a PWM control signal, which is input to the Hin and Lin pins of the driving chip IR2110 through the current limiting resistors R4 and R5, the Ho and Lo pins of the driving chip IR2110 are respectively connected to the gates of the switching tubes Sd1 and Sd2, and the external control voltage Vin is connected to the source of the switching tube Sd1.

[0009] When Sd1 is turned on, an on drive signal can be obtained at the output of the half-bridge circuit. When Sd2 is turned on, an off drive signal can be obtained. Sd2 is triggered by Lo, and when Lo is high, Lin is also high. Sd1 is triggered by Ho, and when Hin is high, Ho is also high.

[0010] The output end of the half-bridge driving circuit is connected to two ends of the first-stage coaxial series-centered magnetic ring and the last-stage coaxial series-centered magnetic ring.

[0011] The coaxial series core magnetic ring structure is: using a turn of coaxial line as the primary winding of the coaxial series core magnetic ring and the coaxial line has a shielding layer and the outer layer is grounded, which can play a good shielding and anti-interference role, and the secondary side uses a wound multi-turn insulated wire, which can play a boost driving effect on the semiconductor switch. The magnetic cores of each level of the coaxial series core magnetic ring are all connected in series to ensure the synchronization of the driving signal.

[0012] The gate integrated trigger circuit includes: switch tubes S1-1 and S1-2, parasitic diodes D1-1 and D1-2, a bootstrap capacitor Cq and two voltage stabilizing diodes.

[0013] The drain of the switch tube S1-1 is connected to the upper end of the secondary winding of each coaxial series magnetic ring, the source of the switch tube S1-1 is connected to the gate of the switch tube S1-2, the source of the switch tube S1-2 is connected to the lower end of the secondary winding of each coaxial series magnetic ring, and the drain of the switch tube S1-2 is connected to the gate of the switch tube S1-1.

[0014] The bootstrap capacitor Cq is connected to the source of the switch tube S1-1 and the drain of the switch tube S1-2; two voltage regulator diodes are connected in reverse series and then connected in parallel to the two ends of the bootstrap capacitor Cq; the output end of the gate integrated trigger circuit is connected to the gate of the solid-state switch tube to be controlled.

[0015] The second aspect of the utility model describes a working method for a solid-state Marx generator drive circuit. The specific working process is: the gate signal of the solid-state Marx circuit switch tube is calculated by a digital processor to generate a PWM signal, and the positive and negative pulses are generated by controlling the half-bridge drive circuit to control the opening and closing of the solid-state Marx circuit switch tube through the coaxial series core magnetic ring and the secondary side integrated gate integrated trigger circuit.

[0016] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0017] The utility model discloses a driving circuit for a solid-state Marx generator, which realizes good isolation of a control signal from a main circuit, has adjustable pulse width and frequency, good driving performance, avoids using multiple power supplies for each switch, ensures the synchronization of the driving signal, greatly improves the efficiency of the solid-state Marx generator, and solves the problem that a traditional driving scheme requires separate isolated power supply for each stage of the secondary side drive. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the principle block diagram of the utility model;

[0019] Figure 2 This is the half-bridge driving circuit diagram of the utility model;

[0020] Figure 3 This is a coaxial series core magnetic ring and gate integrated trigger circuit diagram of the utility model;

[0021] Figure 4 This is the equivalent circuit diagram of the gate integrated trigger circuit of the utility model when it is turned on;

[0022] Figure 5 This is the equivalent circuit diagram of the utility model gate integrated trigger circuit when it is turned off;

[0023] Figure 6 It is a timing diagram of the driving signal of the utility model.

[0024] In the figure: 1. Half-bridge drive circuit; 2. Series magnetic ring; 3. Gate integrated trigger circuit. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, they are only corresponding to the drawings of the present invention, for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction:

[0026] The whole utility model principle block diagram is as follows Figure 1 As shown, it includes a half-bridge driving circuit 1, a coaxial series core magnetic ring 2 and a gate integrated trigger circuit 3, and the coaxial series core magnetic ring 2 is connected to the half-bridge driving circuit 1 and the gate integrated trigger circuit 3 respectively.

[0027] like Figure 2As shown, the half-bridge driving circuit 1 includes a digital processor, a driving chip IR2110, current limiting resistors R1-R5, voltage stabilizing diodes D1-D2, two switch tubes Sd1, Sd2 and capacitors C1-C3; the gate signal of the solid-state Marx switch tube is generated by the digital processor, and the positive and negative pulses generated by the half-bridge circuit are input to the coaxial series core magnetic ring 2 with insulated wire and the secondary integrated gate integrated trigger circuit 3 to control the opening and closing of the solid-state switch tube.

[0028] like Figure 3 The structure diagram of the coaxial series core magnetic ring 2 and the gate integrated trigger circuit 3 is shown. The coaxial series core magnetic ring 2 uses a turn of coaxial line as the primary winding of the coaxial series core magnetic ring 2, and the coaxial line has a shielding layer and the outer layer is grounded, which can play a good shielding and anti-interference role. The secondary side uses a wound multi-turn insulated wire, which can play a boost driving effect on the semiconductor switch; the magnetic cores of each level of the coaxial series core magnetic ring 2 are all connected in series to ensure the synchronization of the drive signal.

[0029] The gate integrated trigger circuit 3 is connected to the secondary winding output end of the coaxial series core magnetic ring 2 .

[0030] like Figure 3 As shown, each level of gate integrated trigger circuit 3 includes: two switch tubes S1-1 and S1-2 and parasitic diodes D1-1 and D1-2, a bootstrap capacitor Cq and two voltage regulator diodes. The drain of the switch tube S1-1 is connected to the upper end of the secondary winding of each level of coaxial series core magnetic ring 2, and the source is connected to the gate of the switch tube S1-2. The source of the switch tube S1-2 is connected to the lower end of the secondary winding of each level of coaxial series core magnetic ring 2, and the drain is connected to the gate of the switch tube S1-1; the bootstrap capacitor Cq is connected to the source of the switch tube S1-1 and the drain of the switch tube S1-2; the two voltage regulator diodes are connected in reverse series and then connected in parallel to the two ends of the bootstrap capacitor Cq; the output end of the gate integrated trigger circuit 3 is connected to the gate of the solid-state switch tube to be controlled.

[0031] The specific working process is as follows: Taking the synchronous driving signal of the solid-state Marx circuit switch tube as an example: Figure 4 As shown, when the turn-on signal comes, the switch tube S1-2 is turned on, forming a path with D1-1, Cq1, and S1-2. At this time, the path charges the bootstrap capacitor Cq1 to a positive voltage high level and triggers the switch tube Q1 to turn on.

[0032] During the dead time between the turn-on signal and the turn-off signal, the charge in the bootstrap capacitor Cq1 has nowhere to be discharged and is maintained at a high level, and the solid-state switch tube Q1 will always be maintained in the on stage.

[0033] like Figure 5As shown, when the turn-off signal arrives, the switch tube S1-1 is turned on, and a path is formed with D1-2, Cq1, and S1-1. At this time, the path charges Cq1 to a negative voltage low level, triggering the switch tube Q1 to turn off. After the turn-off signal ends, Q1 will be turned off and in a self-maintained turn-off stage. When the next turn-on signal arrives, it will turn on again, and the cycle will repeat.

[0034] like Figure 6 The figure shows the normal driving signal timing diagram. The gate signal of the solid-state Marx generator is generated by a digital processor. By controlling the digital processor, the pulse width, frequency and dead time of the driving signal can be changed. The charging and discharging circuit formed is as shown above. Figure 4 and 5 shown.

[0035] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A high performance drive circuit for a solid-state Marx generator, characterized in that: The invention comprises a half-bridge drive circuit (1), a coaxial series core magnetic ring (2), and a gate integrated trigger circuit (3); the drive circuit signal of the solid-state Marx generator is generated by a digital processor and then enters the half-bridge drive circuit (1); the half-bridge drive circuit (1) amplifies the control signal and then outputs it to the primary side of the coaxial series core magnetic ring (2); the secondary side of the coaxial series core magnetic ring (2) is connected to the gate integrated trigger circuit (3); and the output end of each stage of the gate integrated trigger circuit (3) is connected to the gate of the solid-state Marx generator switch tube to be driven.

2. The high performance driving circuit for a solid-state Marx generator as claimed in claim 1, characterized in that: The half-bridge driving circuit (1) comprises: a digital processor, a driving chip IR2110, current limiting resistors R1-R5, voltage stabilizing diodes D1-D1, two switching tubes Sd1 and Sd2, and capacitors C1-C3.

3. The high performance driving circuit for a solid-state Marx generator as claimed in claim 1, characterized in that: The structure of the coaxial series core magnetic ring (2) is as follows: a turn of coaxial line is used as the primary winding of the coaxial series core magnetic ring (2), the coaxial line has a shielding layer and the outer layer is grounded, and the secondary side uses a plurality of turns of wound insulated wire, and the magnetic cores of each level of the coaxial series core magnetic ring (2) are all connected in series.

4. The high performance driving circuit for a solid-state Marx generator as claimed in claim 1, characterized in that: The gate integrated trigger circuit (3) comprises: switch tubes S1-1 and S1-2, parasitic diodes D1-1 and D1-2, a bootstrap capacitor Cq and two voltage stabilizing diodes; the drain of the switch tube S1-1 is connected to the upper end of the secondary winding of each coaxial series core magnetic ring (2), the source of the switch tube S1-1 is connected to the gate of the switch tube S1-2, the source of the switch tube S1-2 is connected to the lower end of the secondary winding of each coaxial series core magnetic ring (2), and the drain of the switch tube S1-2 is connected to the gate of the switch tube S1-1; the bootstrap capacitor Cq is connected to the source of the switch tube S1-1 and the drain of the switch tube S1-2; the two voltage stabilizing diodes are connected in reverse series and then connected in parallel to the two ends of the bootstrap capacitor Cq; the output end of the gate integrated trigger circuit is connected to the gate of the solid-state switch tube to be controlled.

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