Marx circuit with fault tolerance

Abstract

The utility model discloses a Marx circuit with fault tolerance, which comprises a plurality of Marx sub-circuit units, and is characterized in that each Marx sub-circuit unit comprises a diode VC1, a capacitor C2, a switch tube VD1 and a bypass diode VS1, the anode of the diode VC1 is used for connecting an adjacent Marx sub-circuit unit or connected to a charging power supply, and the cathode of the diode VS1 is used for connecting the adjacent Marx sub-circuit unit. The cathode of the diode VC1 is connected to the drain electrode of the switching tube VD1 through a resistor R1, the cathode of the diode VC1 is connected to the anode of the diode VS1 through a capacitor C2, and the cathode of the diode VS1 is led out of a grounding terminal to be grounded or connected with the anode of the diode VS1 of the adjacent marx sub-circuit unit; the source electrode of the switching tube VD1 is connected to the cathode of the diode VS1; the anode of the diode VS1 is used for being connected to the cathode of the diode VS1 of the adjacent marx sub-circuit unit or leading out a high-voltage output terminal; and the drain electrode of the switching tube VD1 is connected to the anode of the diode VS1 through the resistor RDC1. By introducing the bypass diode, the inherent problem of failure of the whole series system due to failure of a single group of discharge switches is solved.

Description

Technical Field

[0001] The utility model relates to the field of high-voltage direct current pulse power supply, in particular to a Marx circuit with fault tolerance. Background Art

[0002] A high-voltage DC pulse power supply is a high-voltage power supply with adjustable output pulse amplitude, pulse width, and pulse frequency. A high-voltage DC pulse power supply can be implemented by means of a Marx pulse generator. For example, a matrix-type flexible ultra-high voltage pulse generating circuit based on a lightweight Marx circuit with patent application number 202311447403.6 includes a high-frequency AC power supply, a rectifier circuit, multiple Marx pulse generators and their corresponding pulse transformers. A pulse transformer is added to the rear end of the pulse generator, and the secondary sides of multiple transformers are connected in series to obtain a higher pulse voltage. The voltage required to be borne by each pulse generator is greatly reduced, thereby improving the safety and reliability of the equipment.

[0003] Marx circuit is the most common discharge pulse forming circuit that charges capacitors in parallel and discharges in series to achieve high voltage output. It has low cost, high performance, simple structure and is easier to implement. Marx circuit can achieve nanosecond narrow pulses and very high pulse frequencies.

[0004] The Marx circuits widely used in the prior art are all multi-stage cumulative pulse forming networks. Due to the high working voltage, components are easily damaged. When a single set of switches fails, the entire set of pulse forming networks will have no output, causing the failure of the entire power supply, and it is impossible to quickly locate the fault after the power supply fails. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a Marx circuit with fault tolerance. By introducing a bypass diode into the improved Marx circuit, the inherent problem of failure of the entire series system when a single discharge switch fails is overcome. Even if a single discharge switch fails, the high-voltage DC pulse output will only have a decrease in pulse amplitude. By measuring a single switch, the fault point can be quickly located and the fault problem can be solved.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a Marx circuit with fault tolerance, including multiple marx sub-circuit units, each marx sub-circuit unit includes a diode VC1, a capacitor C2, a switch tube VD1 and a bypass diode VS1, wherein the anode of the diode VC1 is used to connect the adjacent marx sub-circuit unit or connect to the charging power supply, the cathode of the diode VC1 is connected to the drain of the switch tube VD1 through a resistor R1, the cathode of the diode VC1 is connected to the anode of the diode VS1 through a capacitor C2, and the cathode of the diode VS1 is connected to the ground terminal or connected to the anode of the diode VS1 of the adjacent marx sub-circuit unit; the source of the switch tube VD1 is connected to the cathode of the diode VS1; the anode of the diode VS1 is used to connect to the cathode of the diode VS1 of the adjacent marx sub-circuit unit or lead to the high-voltage output terminal; the drain of the switch tube VD1 is connected to the anode of the diode VS1 through a resistor RDC1.

[0007] The marx circuit further includes a current transformer TA1, which is used for mutual sensing to collect gate voltage and current signals of the switch tube VD1. The output end of the current transformer is connected to a control unit, which is used for outputting an alarm signal.

[0008] The output end of the control unit is connected to an alarm unit, and the alarm unit is used to generate a fault signal and indicate the fault location.

[0009] The alarm unit is an indicator light corresponding to each marx sub-circuit unit one by one.

[0010] The gate of the switch tube VD1 is connected to the source of the switch tube VD1 via the capacitor C1; the gate of the switch tube VD1 is grounded via the resistor R3; the gate of the switch tube VD1 is connected to the cathode of the diode V1, and the anode of the diode V1 is grounded; and the cathode of V1 is connected to one end of the current transformer TA1 via the resistor R2, and the other end of the current transformer TA1 is grounded.

[0011] The switch tube VD1 is an IGBT tube.

[0012] The advantages of the present invention are: by introducing a bypass diode into the improved Marx circuit, the inherent problem of failure of the entire series system when a single discharge switch fails is overcome. Even if a single discharge switch fails, the high-voltage DC pulse output will only have a decrease in pulse amplitude. By measuring the single switch, the fault point can be quickly located and the fault problem can be solved. The circuit of the utility model overcomes the inherent problem of failure of the entire series system when a single discharge switch fails in the Marx pulse generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0014] Figure 1 This is the principle diagram of the marx circuit of the utility model. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0016] The main purpose of this embodiment is to enable the normal operation of the entire MARC circuit after a single switch group in the MARC circuit fails, but the high-voltage DC pulse output will only have a decrease in pulse amplitude, and will not directly shut down without outputting pulse voltage. At the same time, it can quickly alarm and locate the fault position, which is convenient for subsequent maintenance and processing.

[0017] like Figure 1 As shown, a Marx circuit with fault tolerance includes multiple Marx sub-circuit units, each Marx sub-circuit unit includes a diode VC1, a capacitor C2, a switch tube VD1 and a bypass diode VS1, wherein the anode of the diode VC1 is used to connect to an adjacent Marx sub-circuit unit or to a charging power supply, the cathode of the diode VC1 is connected to the drain of the switch tube VD1 via a resistor R1, the cathode of the diode VC1 is connected to the anode of the diode VS1 via a capacitor C2, the cathode of the diode VS1 is connected to the ground terminal or connected to the anode of the diode VS1 of the adjacent Marx sub-circuit unit; the source of the switch tube VD1 is connected to the cathode of the diode VS1; the anode of the diode VS1 is used to connect to the cathode of the diode VS1 of the adjacent Marx sub-circuit unit or to lead to a high-voltage output terminal; the drain of the switch tube VD1 is connected to the anode of the diode VS1 via a resistor RDC1. In each marx sub-unit circuit, if the marx sub-circuit unit belongs to the first circuit, it belongs to a directly grounded sub-unit, the internal VS1 cathode is grounded GND, and the VS1 anode is connected to the cathode of VS1 in the adjacent previous sub-unit; the anode of VC1 is connected to the cathode of VC1 of the previous sub-unit; if the marx sub-circuit unit belongs to the last sub-unit, it is connected to the power supply and the output power supply, then it has no VC1 diode, and the high-voltage power supply is directly connected to the positive poles of R1 and capacitor C1; the anode of diode VS1 leads to the high-voltage output terminal, and the cathode of VS1 is connected to the anode of VS1 of the next sub-unit.

[0018] Its working principle is as follows: the marx circuit is parallel charging and series discharging, and the control unit of the marx circuit outputs a driving control signal to keep the switch tube VD1 in each sub-unit disconnected. At this time, the sub-units are connected in parallel, and the high-voltage power supply charges C2 of each sub-unit; when high-voltage discharge is required, the control unit controls the switch tube VD1 of each sub-unit to close, and then forms a series circuit with the capacitor C2 between the sub-units to output pulse high voltage electricity to the outside; at this time, if the switch tube VD1 of one of the sub-units fails, the series circuit will form a circuit through the resistor R1, RDC1, and the diode VS1, short-circuit the switch tube VD1, cut out the faulty sub-unit, and achieve normal operation; if there is no fault, a series circuit will be formed through the switch tube VD1. In this way, by adding the VS1 switch tube, when a sub-unit fails, the sub-unit can be cut out at any time without affecting the normal operation output of the marx circuit.

[0019] In a preferred embodiment, the marx circuit also includes a current transformer TA1, which is used to collect the gate voltage and current signals of the switch tube VD1. The output end of the current transformer is connected to the control unit, and the control unit is used to output an alarm signal. The output end of the control unit is connected to the alarm unit, and the alarm unit is used to issue a fault and indicate the fault location. The control unit is the main control chip of the marx circuit, which can realize the control of the switch tube of the marx circuit, and can detect the state of the current transformer at the same time, and issue an alarm signal according to the detection result. Since the gate voltage of the switch tube VD1 is different when it is closed and disconnected, the fault location can be judged according to the current signal or voltage signal collected by the current transformer. When the electrical signal collected by the current transformer of a subunit is incorrect, the corresponding subunit is the fault location. In order to better issue an alarm and remind the fault location, an indicator LED can be set for each subunit, and one LED bulb corresponds to one subunit. The alarm unit is an indicator light corresponding to each marx sub-circuit unit. The control module drives and controls the lighting state of each LED lamp according to the signal of the current transformer in each subunit.

[0020] The circuit of current transformer collecting electrical signals is as follows Figure 1 As shown, the switch tube VD1 adopts an IGBT tube, the gate of the switch tube VD1 is connected to the source of the switch tube VD1 through the capacitor C1; the gate of the switch tube VD1 is grounded through the resistor R3; the gate of the switch tube VD1 is connected to the cathode of the diode V1, and the anode of the diode V1 is grounded; and the cathode of V1 is connected to one end of the current transformer TA1 through the resistor R2, and the other end of the current transformer TA1 is grounded.

[0021] In this embodiment, a bypass diode is introduced into the improved Marx circuit to overcome the inherent problem that the entire series system fails when a single discharge switch fails. Even if a single discharge switch fails, the high-voltage DC pulse output will only have a reduced pulse amplitude. By measuring a single switch, the fault point can be quickly located and the fault problem can be solved.

[0022] like Figure 1 As shown, it is a circuit combination of 24 groups of solid-state switch Marx circuits connected in series to form a discharge pulse network. The negative pole of VC1 is connected to the 1st pin of R1 and C2, and the 2nd pins of R1 and C2 are connected to the two ends of RDC1 respectively. The 1st pin of RDC1 is connected to the collector C of VD1 (IGBT), and the 2nd pin of RDC1 is connected to the positive pole of VS1. The emitter E of VD1 (IGBT) is connected to the negative pole of VS1 and GND. The gate G of VD1 (IGBT) is connected to the 1st pin of R3 and C1, and the 2nd pins of R3 and C1 are connected to GND. The gate G of VD1 (IGBT) is connected to the 2nd pin of R2 and the negative pole of V1. The TA1 current transformer is connected in series between the 1st pin of R2 and the positive pole of V1. The above circuit connection is 1 group, and a total of 24 groups of Marx circuits are connected in series to form a discharge pulse network.

[0023] When a single discharge switch fails, the high voltage DC pulse ensures the connectivity of the series circuit through the bypass diode. The circuit of the utility model overcomes the inherent problem of the Marx pulse generator that the entire series system fails when a single discharge switch fails.

[0024] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A Marx circuit with fault tolerance, comprising a plurality of Marx sub-circuit units, characterized in that: Each marx sub-circuit unit includes a diode VC1, a capacitor C2, a switch tube VD1 and a bypass diode VS1, wherein the anode of the diode VC1 is used to connect to an adjacent marx sub-circuit unit or to a charging power supply, the cathode of the diode VC1 is connected to the drain of the switch tube VD1 via a resistor R1, the cathode of the diode VC1 is connected to the anode of the diode VS1 via a capacitor C2, the cathode of the diode VS1 is connected to the ground terminal or connected to the anode of the diode VS1 of the adjacent marx sub-circuit unit; the source of the switch tube VD1 is connected to the cathode of the diode VS1; the anode of the diode VS1 is used to connect to the cathode of the diode VS1 of the adjacent marx sub-circuit unit or to lead to a high-voltage output terminal; the drain of the switch tube VD1 is connected to the anode of the diode VS1 via a resistor RDC1.

2. A Marx circuit with fault tolerance as claimed in claim 1, characterized in that: The Marx circuit further includes a current transformer TA1, which is used for mutual sensing to collect gate voltage and current signals of the switch tube VD1. The output end of the current transformer is connected to a control unit, which is used for outputting an alarm signal.

3. A Marx circuit with fault tolerance as claimed in claim 2, characterized in that: The output end of the control unit is connected to an alarm unit, and the alarm unit is used to generate a fault signal and indicate the fault location.

4. A Marx circuit with fault tolerance as claimed in claim 3, characterized in that: The alarm unit is an indicator light corresponding to each marx sub-circuit unit one by one.

5. A fault-tolerant Marx circuit according to any one of claims 1 to 4, characterized in that: The gate of the switch tube VD1 is connected to the source of the switch tube VD1 via the capacitor C1; the gate of the switch tube VD1 is grounded via the resistor R3; the gate of the switch tube VD1 is connected to the cathode of the diode V1, and the anode of the diode V1 is grounded; and the cathode of V1 is connected to one end of the current transformer TA1 via the resistor R2, and the other end of the current transformer TA1 is grounded.

6. A fault-tolerant Marx circuit according to any one of claims 1 to 4, characterized in that: The switch tube VD1 is an IGBT tube.

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