CN113691239A - Magnetic switch pulse generator for electric pulse rock breaking - Google Patents
Magnetic switch pulse generator for electric pulse rock breaking Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/14—Drilling by use of heat, e.g. flame drilling
- E21B7/15—Drilling by use of heat, e.g. flame drilling of electrically generated heat
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/59—Generators characterised by the type of circuit or by the means used for producing pulses by the use of galvano-magnetic devices, e.g. Hall effect devices
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Abstract
The invention discloses a magnetic switch pulse generator for electric pulse rock breaking, which comprises a power supply, a rectifying and filtering module, an energy storage module, a switch module, a transformer, a pre-breakdown module, a magnetic switch module and a load, wherein the power supply is connected with the rectifying and filtering module; the power supply charges the whole pulse generator, and the rectification and filtering module rectifies and filters the voltage waveform input by the power supply; the switch module adjusts the discharge frequency of the pulse generator; the voltage is continuously boosted through the transformer boosting and pre-breakdown module, and a load channel is broken down by the rising edge steepening instantaneous high pulse voltage; the energy storage module stores energy, and after the pre-breakdown module breaks down a load, the pre-breakdown module controls the pre-breakdown module to inject instantaneous pulse energy into the load through the magnetic switch module; the magnetic switch module has the function of isolating high voltage and high current across the load. The invention can be flexibly selected and designed according to the load type, and has the advantages of strong transportability, high rock breaking energy consumption efficiency and the like.
Description
Technical Field
The invention belongs to the field of high-energy electric pulse rock breaking tools and energy sources, and particularly relates to a magnetic switch pulse generator for electric pulse rock breaking.
Background
Rock breaking is an urgent problem to be solved in projects such as exploration and development of buildings, roads, bridges and energy sources (such as coal, petroleum, natural gas and the like). At present, the most common rock breaking method is the traditional mechanical rock breaking method, but the traditional mechanical rock breaking method has high cost and certain influence on the environment, so that the rock breaking efficiency is urgently needed to be improved. With the progress of social science and technology, new rock breaking methods are developed, such as high-pressure water jet rock breaking, heat energy rock breaking, fire drilling, electron beam rock breaking, laser rock breaking, hot melting drilling, heat energy mechanical energy rock breaking (heat engine rock breaking), electric pulse rock breaking technology, laser rock breaking technology and the like. Compared with other rock breaking technologies, the electric pulse rock breaking technology is widely accepted by the scientific community because of the advantages of environmental protection and easy control of the rock breaking process, but at present, domestic research on the electric pulse rock breaking technology still stays in the application and exploration stage.
The electric pulse rock breaking technology is based on the lightning principle; according to the medium of the pulse discharge channel, the pulse discharge channel is divided into electric rock breaking and liquid electric rock breaking. Electrical and hydraulic rock breaking differ in the rise time of the pulse voltage; when the rise time of the pulse voltage is less than 500ns, a discharge channel is generated in the rock, and the instantaneous collection quantity (about 10-100J/cm) in the channel is generated at the moment3) High temperature (up to 10 deg.C) is generated4The temperature is in the order of magnitude of DEG C) and high pressure (the order of magnitude of 1000-10000 MPa), stress waves are generated in the channel under the action of high temperature and high pressure, when the action of the stress waves on rocks exceeds the self strength of the rocks, the rocks are damaged, and the rock breaking mode is electric rock breaking. When the rise time of pulse voltage is more than 500ns, the electrohydraulic rock breaking can be generated, at the moment, the discharge plasma can produce one part of instantaneous stress wave in the liquid medium, at the same time, another part of stress wave can be generated due to the collapse of bubble produced by liquid medium, when the two parts of stress are stressWhen the wave exceeds the strength of the rock itself, the rock is destroyed. There are some common features of the two rock breaking methods: (1) a discharge channel needs to be opened in the medium; (2) after the channel is generated, the electric energy (charge) in the circuit is instantaneously injected into the medium; (3) the rock breaking efficiency is positively correlated with the energy injected into the channel.
In order to accelerate the application and development of the high-voltage electric pulse rock breaking technology, an electric pulse generating device needs to be designed by combining a specific electric pulse rock breaking process. However, a method for increasing the energy consumption efficiency of the electric pulse generation device is proposed by few people at present according to a specific electric pulse rock breaking mechanism, so that the efficiency of the designed electric pulse rock breaking device is relatively low. Therefore, the design of the corresponding electric pulse generating device by combining the specific process of electric pulse rock breaking is very important for the industrial application and popularization of the electric pulse rock breaking technology.
In view of this, the present patent is applied.
Disclosure of Invention
The invention aims to provide a magnetic switch pulse generator for breaking rocks by electric pulses, which firstly opens a discharge channel in a load (rocks or liquid insulating media) by instantaneous high-voltage electric pulses and then injects a part of stored energy into the opened discharge channel by an adjusting switch so as to finally realize the efficient breaking of the rocks.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetically switched pulse generator for electrical pulse rock breaking, comprising:
the power supply is used as an energy source of the pulse generator and provides charging voltage;
the rectification filtering module is connected to the output end of the power supply and is used for rectifying and filtering the charging voltage output by the power supply;
the switch module is connected to the output end of the rectifying and filtering module and is used for controlling the discharge frequency of the pulse generator;
the energy storage module is connected to the output end of the rectifying and filtering module, and charges the energy storage module by the charging voltage rectified and filtered by the rectifying and filtering module, and the energy storage module stores energy;
the primary winding of the transformer is connected to the output end of the switch module, is connected with the energy storage module in parallel and is used for preliminarily boosting the voltage;
the pre-breakdown module is connected in parallel with the secondary winding of the transformer and is used for continuously boosting and sharpening the voltage of the transformer after primary boosting;
the load is connected to the output end of the pre-breakdown module in parallel, the pre-breakdown module provides instantaneous high pulse voltage for breaking down the load and forms a channel in the load;
the magnetic switch module is connected to the output end of the switch module, connected with the load and used for controlling the energy storage module to discharge to the load; the magnetic switch module is switched off before the pre-breakdown module breaks down the load, and the magnetic switch module is switched on before and after the pre-breakdown module breaks down the load; and the energy storage module discharges electricity to a load through the switch module and the magnetic switch module after the magnetic switch module is closed, so that rock breaking is realized.
Furthermore, the switch module comprises a switch and a trigger circuit connected with the switch, and the trigger circuit controls the on-off of the switch by receiving the quantity and time interval of trigger signals so as to control the discharge frequency of the electric pulse generator.
Further, the load is a liquid medium or rock; when the load is a liquid medium, the pulse sharpening effect of the pre-breakdown module can be relatively weakened, and a larger pulse voltage peak value is ensured; when the load is liquid rock, the pre-breakdown module has a strong pulse sharpening effect, and a large pulse voltage peak value is ensured.
Furthermore, the magnetic switch module comprises a magnetic switch and a reset circuit connected with the magnetic switch, and the reset circuit controls the magnetic switch to be disconnected after the energy storage module finishes discharging the load.
Further, the rectification filter module and the switch are realized by adopting an insulated gate bipolar transistor driving board.
Furthermore, the energy storage module is realized by adopting two capacitor banks, wherein one capacitor bank is connected to two ends of a power supply; the other capacitor bank is connected between the output of the switch and the primary winding of the transformer.
Further, the transformer adopts a pulse transformer.
Further, the pre-breakdown module can be implemented by using an LC circuit and an LC pulse compression circuit, and an inductor in the LC pulse compression circuit is a saturable inductor.
Further, the transformer and the pre-breakdown module can be realized by adopting a transformer circuit or a magnetic switch circuit;
the transformer circuit comprises a first adjustable transformer and a second adjustable transformer, wherein a primary winding of the first adjustable transformer is connected with the switch module, a secondary winding of the first adjustable transformer is connected with a primary winding of the second adjustable transformer through a capacitor, and a secondary winding of the second adjustable transformer is connected with a load through a capacitor;
the magnetic switch circuit comprises a third adjustable transformer, a first magnetic switch, a second magnetic switch and a third magnetic switch, wherein a primary winding of the third adjustable transformer is connected with the switch module, a secondary winding of the third adjustable transformer is connected with a first capacitor and a second capacitor in parallel, the second capacitor is connected with the first magnetic switch, a grounding end of the first capacitor is connected with the second magnetic switch, output ends of the first magnetic switch and the second magnetic switch are connected with a third capacitor and a fourth capacitor in parallel, the fourth capacitor is connected with the third magnetic switch, an output end of the third magnetic switch is connected with an inductor and a load, a grounding end of the third capacitor is connected with the inductor, and the load is connected with the inductor in parallel.
Furthermore, the pre-breakdown module can be implemented by a plurality of air gap switch circuits connected in parallel, each air gap switch circuit comprises an air gap switch, a first boost capacitor, a second boost capacitor, a first protection resistor and a second protection resistor, the first boost capacitor, the first protection resistor, the second boost capacitor and the second protection resistor are sequentially connected end to end, and two ends of each air gap switch are respectively connected to output ends of the first protection resistor and the second protection resistor;
the pre-breakdown module is characterized in that a gas gap switch in a first gas gap switch circuit is connected with a trigger circuit, the trigger circuit comprises a voltage source, a first pulse transformer, a shaping bridge circuit, a buffer circuit, a protection circuit, a silicon controlled rectifier, a second pulse transformer, an IGBT (insulated gate bipolar transistor) drive board, a signal delay module and a trigger signal module, the voltage source is connected with a primary winding of the first pulse transformer, a secondary winding of the first pulse transformer is connected with the shaping bridge circuit, the buffer circuit is connected with the protection circuit after being connected with the silicon controlled rectifier in parallel, the primary winding of the second pulse transformer is connected with the protection circuit, the secondary winding of the second pulse transformer is connected with the gas gap switch, the silicon controlled rectifier, the IGBT drive board, the signal delay module and the trigger signal module are sequentially connected, and the trigger signal module is further connected with the switch.
The electric pulse generator is designed by combining the specific process and mechanism of electric pulse rock breaking, the rock breaking energy consumption efficiency is high, and meanwhile, the specific and flexible circuit structure of the electric pulse generator can be designed according to the mode and load type of electric pulse rock breaking. The method has the advantages of strong pertinence, flexibility, portability and the like.
Drawings
FIG. 1 is a schematic diagram of a magnetic switch pulse generator for breaking rock by electric pulse according to the present invention; in the figure, 1, power supply; 2. a rectification filtering module; 3. an energy storage module; 4. a switch; 5. a trigger circuit; 6. a transformer; 7. a pre-breakdown module; 8. a magnetic switch; 9. a reset circuit; 10. and (4) loading.
FIG. 2 is a schematic diagram of a hysteresis loop of a magnetic material; in the figure, B is magnetic induction intensity; h is the magnetic field intensity; hsIs a magnetic field intensity saturation value; b issIs the saturation value B of magnetic inductions；BrThe residual induction intensity is used as the residual induction intensity; hcmIs the coercive force.
Fig. 3 is a schematic circuit diagram of embodiment 2 of the present invention; in the figure, U0Is a power supply; s is an Insulated Gate Bipolar Transistor (IGBT) drive board; c0Is an energy storage capacitor; csThe capacitor is a front-end capacitor of the pulse transformer; TP is a pulse transformer; l is1Is a resonant inductor; c1A magnetic pulse compression capacitor; l ismIs a saturable inductor; c2A magnetic pulse compression capacitor; MS (Mass Spectrometry)0Is a magnetic switch; i is0A current source for a reset circuit; l is0Is a power supply inductor; r0Is a load.
FIG. 4 is a schematic circuit diagram according to embodiment 3 of the present invention; in the figure, U0Is a power supply; s is an Insulated Gate Bipolar Transistor (IGBT) drive board; c0Is an energy storage capacitor; csIs a front-end capacitor of the transformer; TR (transmitter-receiver)MV1Is a primary magnetic compression transformer, C1A first-level magnetic pulse compression capacitor; TR (transmitter-receiver)MV2A two-stage magnetic compression transformer; c2The capacitor is compressed by two-stage magnetic pulses; MS (Mass Spectrometry)0Is a magnetic switch; i is0Is a magnetic switch MS0The reset circuit current source of (1); l is0Is a power supply inductor; r0Is a load.
FIG. 5 is a schematic circuit diagram according to embodiment 4 of the present invention; u shape0Is a power supply; s is an Insulated Gate Bipolar Transistor (IGBT) drive board; c0Is an energy storage capacitor; csThe capacitor is a front-end capacitor of the pulse transformer; TP is a pulse transformer; r is1～r2nTo protect the resistance; c1～CnIs a boost capacitor; g2～GnIs an air gap switch; g1Triggering an air gap switch by three electrodes, wherein k and j are respectively a pulse voltage node and a grounding node of a trigger electrode of the air gap switch; r0Is a load; MS (Mass Spectrometry)0A magnetic switch; i is0Is a magnetic switch MS0The reset circuit current source of (1); l is0Is a power supply inductor; u. of0A voltage source for the trigger circuit; TR (transmitter-receiver)1And TR2Is a pulse transformer; d1～D7Is a diode; r1～R3Is a resistance; c. C1～c2Is a capacitor; e0Is a thyristor.
FIG. 6 is a schematic circuit diagram according to embodiment 5 of the present invention; in the figure, U0Is a voltage source; s is an Insulated Gate Bipolar Transistor (IGBT) drive board; c0Is an energy storage capacitor; csIs a front-end capacitor of the transformer; TP is a pulse transformer; c1～C2A first-stage voltage-multiplying unit capacitor; MS (Mass Spectrometry)1The magnetic compression switch is a primary voltage doubling unit; MS (Mass Spectrometry)2～MS3The voltage-multiplying magnetic switch is a secondary voltage-multiplying unit; c3～C4The capacitor is a two-stage voltage-multiplying unit capacitor; MS (Mass Spectrometry)0Is a magnetic switch; i is0Is a magnetic switchOff MS0The reset circuit current source of (1); l is0Is a power supply inductor; r0Is a load.
In FIGS. 1, 3-6, a, b, c and d are low inductance wire nodes; e. f, g and h are high voltage wire nodes.
Detailed Description
Example 1
The magnetic switch pulse generator for electric pulse rock breaking provided by the embodiment firstly opens a discharge channel in a load (rock or liquid insulating medium) through instantaneous high-voltage electric pulses, and then injects a part of stored energy into the opened discharge channel through the regulating switch, so that the rock is broken efficiently.
As shown in fig. 1, the magnetic switch pulse generator for electric pulse rock breaking comprises a power supply, a rectification filter module, an energy storage module, a switch, a trigger circuit, a transformer, a pre-breakdown module, a magnetic switch, a reset circuit and a load, wherein the power supply, the rectification filter module and the energy storage module are sequentially connected end to end, the switch is connected with the output end of the rectification filter module, the trigger circuit is connected with the switch, a primary winding of the transformer is connected with the output end of the switch and the negative electrode of the power supply, a secondary winding of the transformer, the pre-breakdown module and the load are connected in parallel and then grounded, the output end of the switch is further connected with the magnetic switch, the magnetic switch is connected with the reset circuit, and the output end of the magnetic switch is connected with the load.
The power supply provides energy input for the whole pulse generator, and is specifically realized by adopting a voltage source, the voltage source outputs voltage waves, and the voltage waves provide working voltage and charging voltage for each module through a circuit; the rectification and filtering module rectifies and filters voltage waves output by the power supply and can be realized by adopting a circuit with rectification and filtering functions in the prior art; the rectified and filtered voltage charges the energy storage module, the energy storage module stores energy, and large energy needs to be stored at the moment according to the rock breaking requirement; the rectified and filtered voltage is charged to the transformer through the switch, the transformer performs primary boosting on the rectified and filtered voltage and transmits the boosted voltage to the pre-breakdown module, the pre-breakdown module further performs continuous boosting and sharpening on the boosted voltage to form instantaneous high-pulse voltage, and the instantaneous high-pulse voltage can breakdown a load and form a channel; the voltage output by the switch is also transmitted to the magnetic switch, the magnetic switch is communicated, a large amount of energy stored by the energy storage module can be discharged to a load, and rock breaking is achieved, wherein disconnection and connection of the switch are controlled through the trigger circuit, the trigger circuit is controlled through receiving the quantity and time intervals of trigger signals, and the trigger signals can adopt optical fiber trigger signals input from the outside.
The magnetic switch is reset by the reset circuit, the substance of the magnetic switch is a saturable inductor which has a hysteresis effect, the working principle of the magnetic switch depends on the hysteresis effect, and the hysteresis loop of the magnetic material is shown in fig. 2. Starting from a magnetic induction B of 0, a sample of ferromagnetic material (including ferromagnetic and ferrimagnetic materials) is gradually increased in magnetic field strength H of the magnetizing field, and the magnetic induction B is increased along the oab curve in fig. 2 until a magnetic saturation state is reached. Now increasing the field strength H the magnetization state of the sample will remain substantially unchanged, so the straight line segment bc is almost parallel to the H-axis. When the magnetic induction intensity reaches the saturation value BsWhile the corresponding magnetic field strength H is HsIn this representation, the oab curve is referred to as the initial magnetization curve. If the magnetization field is reduced thereafter, the magnetization curve does not return from point B along the original initial magnetization curve, which indicates that the change in the magnetic induction B lags behind the change in the magnetic field strength H, a phenomenon called hysteresis. When the magnetic field strength H is reduced to zero, the magnetic induction B is not zero but is equal to the residual induction Br. To reduce the magnetic induction B to zero, an opposite magnetization field must be applied, and when the opposite magnetization field is increased to-HcmThen, the magnetic induction B is zero and HcmReferred to as coercivity. If the magnitude of the reverse magnetization field continues to increase to-HsWhen the sample is magnetized in the opposite direction to reach saturation state e, the corresponding saturation value of magnetic induction intensity is-Bs. Points e and b are symmetric with respect to the origin. After that, if the reverse magnetization field is reduced to zero, it is then increased again in the positive direction. The magnetization state of the sample will return to the forward saturation magnetization state b along the curve egkb. The egkb curve and the bnde curve are also symmetric with respect to the origin o. It follows that when the magnetization field is changed from Hsto-Hsfrom-HsChange to HsUpon repeated changes, the magnetization state of the sample changes through a cyclic process described by a bndegkb closed loop. Therefore, the curve bndegkb is called a hysteresis loop, and therefore, the magnetic switch of the present embodiment uses the reset circuit current source of the magnetic switch as the reset circuit to reset (turn off) the magnetic switch.
Example 2
The embodiment provides a specific implementation circuit of a magnetic switch pulse generator for electric pulse rock breaking, the circuit schematic diagram of the specific implementation circuit is shown in figure 3, and the specific implementation circuit comprises a power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、Cs、C1、C2Pulse transformer TP and inductor L1Saturable inductor LmLoad R0Magnetic switch MS0And a current source I0(ii) a Power supply U0Providing a charging voltage, a capacitor C0、CsForm an energy storage module, a capacitor C0As energy storage capacitor, directly connected to power supply U0Since the energy storage module stores large energy, the capacitor C0A plurality of capacitors can be connected in parallel to form an energy storage capacitor bank, an Insulated Gate Bipolar Transistor (IGBT) drive board S forms a rectifying and filtering module and a switch, and the Insulated Gate Bipolar Transistor (IGBT) drive board S and a power supply U0The connection is carried out, an Insulated Gate Bipolar Transistor (IGBT) drive plate S is connected with a trigger signal, and the output end of the Insulated Gate Bipolar Transistor (IGBT) drive plate S is connected with a capacitor C of the energy storage modulesCapacitor CsA capacitor C connected with the primary winding of the pulse transformer TP1、C2Inductor L1And a saturable inductor LmConstituting a pre-breakdown module, said capacitor C1And an inductance L1Forming an LC resonant circuit, saturable inductor LmAnd a capacitor C2A pulse compression circuit; load R0Being a liquid medium or rock, magnetic switches MS0Connected with the output end of an Insulated Gate Bipolar Transistor (IGBT) drive board S and provided with a current source I0As magnetic switches MS0The reset circuit of (1).
The following working principle of the present embodimentDescription is carried out: in the initial state, the switch composed of the Insulated Gate Bipolar Transistor (IGBT) drive board S is turned off, and the capacitor C0Charging, capacitance CsAnd C1In a fully discharged state. Subsequently, an Insulated Gate Bipolar Transistor (IGBT) drive board S is closed under the control of a trigger signal, and a power supply U0Acting on a primary winding of the pulse transformer TP, and multiplying the voltage of a secondary winding by the voltage ratio of two ends of the primary winding; at this time, the inductance L1And a capacitor C1Forming an LC circuit; if the parasitic effect in the circuit is ignored, the capacitor C1And an inductance L1The voltage across starts to resonate, maximally to twice the value of the voltage of the secondary winding. During this time, the magnetic switch MS0Not yet saturated, i.e. the LC circuit is approximately no load/damping. Using saturable inductors LmAnd a capacitor C2Combined with magnetic pulse compression to reduce the load R0The rise time of the voltage. At the inductor L1And a capacitor C1And the voltage rises rapidly with the compression of the magnetic pulses. Saturable inductor LmIn the capacitor C1And an inductance L1The maximum voltage at two ends is saturated, the smaller rising time of the leading edge of the pulse is generated, and the maximum load R is generated0A voltage. Due to the winding direction of the pulse transformer TP, the load voltage starts to rise in the negative direction, so that the magnetic switch MS0The voltage on the magnetic core is positive, and the magnetic core is magnetized to the positive direction. Magnetic switch MS during the process of the load voltage rising to breakdown0Blocking high pulse voltages, Insulated Gate Bipolar Transistor (IGBT) driver board S and magnetic switch MS0The coplanar low-inductance lead ab in between is approximately just charged to the input voltage. With load R0Breakdown of (rock or liquid medium), sharp drop of load voltage, current flowing from pulse transformer TP and C1And C2The stored energy generates a large amount of thermal plasma in a breakdown channel inside the medium, a pulse transformer TP and a capacitor C1And C2Inductor L1And LmAnd a load R0The efgh of the connecting wire is a high-voltage-resistant wire, so that the electric breakdown is ensured to occur in the load R0Inside. Magnetic switch MS0Is still positive, whichThe magnetic core is further magnetized to the positive direction to realize a magnetic switch MS0Saturation is reached before the arc is extinguished, shortening the breakdown time.
Then, shortly after breakdown, the magnetic switch MS0Saturating and driving the energy storage capacitor C through an Insulated Gate Bipolar Transistor (IGBT) driving board S0Is connected to a load R0Two ends, thereby realizing a load R0High voltage to high current (high energy) conversion across. Due to the large time constant of the charges in the discharge channel (plasma channel), the arc does not extinguish during this transition. Insulated Gate Bipolar Transistor (IGBT) drive board S and magnetic switch MS0And magnetic switch MS0And a load R0The connection between the two leads is formed by coplanar low-inductance leads ab and cd, thereby ensuring the load R0The internal current rises rapidly. Magnetic switch MS0After saturation, it is stored in capacitor C0And CsThe energy in (b) is transferred to the load arc and the plasma channel expands rapidly due to the temperature increase, creating a stress wave and finally achieving rock breaking.
When the capacitance C0And CsIs transferred to the load R0When the power supply is turned off, the Insulated Gate Bipolar Transistor (IGBT) drive plate S is turned off, and the energy storage capacitor C0And recharging to prepare for the next pulse of the electric pulse generator. During this time, the magnetic switch MS0In the current source I0The power supply is supplied and the reset circuit is magnetized reversely and reaches an unsaturated state, thus completing a pulse working cycle of the electric pulse generator for breaking rocks.
The circuit can be adjusted, for example, the discharge frequency of the pulse voltage is adjusted by the frequency of the optical fiber trigger signal; the pulse transformer can be composed of multi-stage transformers, so that higher pulse voltage peak values are realized; magnetic compression circuit (L) in pre-breakdown modulemAnd C2) The pulse voltage generator can also be composed of a multi-stage transformer, and finally the purpose of shorter rising time of the leading edge of the pulse voltage is achieved.
Example 3
The embodiment provides a magnetic switch pulse generator for electric pulse rock breakingThe circuit schematic of the bulk implementation circuit is shown in FIG. 4, and it includes a power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、Cs、C1、C2Controllable transformer TRMV1、TRMV2Load R0Magnetic switch MS0And a current source I0(ii) a Wherein, the power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、CsLoad R0Magnetic switch MS0And a current source I0The functions and connection relationships of the transformer and the pre-breakdown module are the same as those of embodiment 2, which is not described in detail herein, but different from embodiment 2, this embodiment provides a new circuit structure of the transformer and the pre-breakdown module, where the transformer is a controllable transformer TRMV1And TRMV1Composition is carried out; controllable transformer TRMV1And a capacitor C1A first-stage voltage transformation and magnetic compression circuit is formed; TR (transmitter-receiver)MV2And a capacitor C2Forming a two-stage voltage transformation and magnetic compression circuit; the pre-breakdown module 7 is composed of a transformer TRMV1、TRMV2Capacitor C1And C2Formed jointly, the controllable transformer TR in this embodimentMV1And TRMV2And a magnetic core is arranged in the upper winding.
The working principle of this embodiment is explained below with reference to fig. 4: in the initial state, the Insulated Gate Bipolar Transistor (IGBT) drive board S is disconnected, and the capacitor C0Charging, capacitance CsThe discharge is in a fully discharged state. Subsequently, an Insulated Gate Bipolar Transistor (IGBT) drive board S is closed under the control of a trigger signal, and a power supply U0Acting on a controllable transformer TRMV1The voltage of the secondary winding is the voltage at the two ends of the primary winding multiplied by the transformation ratio. Controllable transformer TRMV1The magnetic core of the winding is slowly changed from an unsaturated state to a saturated state, and the capacitor CsIs also slowly charged. Controllable transformer TRMV1During the transition from unsaturated to saturated state of the core of the winding, it is connected to the capacitor C1The rise time of the load voltage is reduced by combining the first-stage magnetic pulse compression on the voltage. Controllable transformer TR during primary magnetic pulse compressionMV2The core of the winding being unsaturated byRegulating capacitance C1And a transformer TRMV1The number of turns of the upper coil, the magnetic flux area and other variables make the controllable transformer TR when the primary magnetic compression voltage reaches the peak valueMV2The core of the winding just reaches saturation. Controllable transformer TRMV2Saturated inductance and capacitance C on winding2The voltage is subjected to two-stage boosting and pulse compression, so that the peak value of the pulse voltage is further increased, and the rising front edge pulse time is reduced until the load R0The voltage across the terminals rises rapidly until breakdown occurs. Magnetic switch MS at this time0The voltage is positive, the magnetic core is magnetized to the positive direction, and the magnetic switch MS is arranged in the process that the load voltage rises to breakdown0Blocking high pulse voltages, Insulated Gate Bipolar Transistor (IGBT) driver board S and magnetic switch MS0The coplanar low-inductance lead ab in between is approximately just charged to the input voltage. With load R0Breakdown of (rock or liquid medium), sharp drop of load voltage, from controllable transformer TRMV1And TRMV2The current flowing out and the capacitance C1And C2In the load R0A large amount of thermal plasma is generated in the breakdown channel inside the dielectric. Controllable transformer TRMV1And TRMV2Capacitor C1And C2And a load R0The connection line efgh between the two is a high-voltage-resistant wire, so that the electric breakdown is ensured to occur in the load R0Inside. Magnetic switch MS0Is still positive, so its core is further magnetized to the positive direction.
Shortly after breakdown, the magnetic switch MS0Saturating and driving the energy storage capacitor C through an Insulated Gate Bipolar Transistor (IGBT) driving board S0Connected across a load to effect a load R0High voltage to high current (high energy) conversion across. Due to the large time constant of the charges in the discharge channel (plasma channel), the arc does not extinguish during this transition. Insulated Gate Bipolar Transistor (IGBT) drive board S and magnetic switch MS0And magnetic switch MS0And a load R0The connection between the two leads is formed by coplanar low-inductance leads ab and cd, thereby ensuring the load R0Internal current flowThe speed rises. Magnetic switch MS0After saturation, it is stored in capacitor C0And CsIs transferred to the load R0In the generated arc, the plasma channel expands rapidly due to the temperature increase, creating a stress wave and finally achieving rock breaking.
When the capacitance C0And CsIs transferred to the load R0When the power supply is turned off, the Insulated Gate Bipolar Transistor (IGBT) drive plate S is turned off, and the energy storage capacitor C0And recharging to prepare for the next pulse of the electric pulse generator. During this time, the magnetic switch MS0In the current source I0The reset circuit supplying power is magnetized reversely and reaches a non-saturation state. This completes a pulse duty cycle in which the electric pulse generator breaks rock.
Meanwhile, the circuit can be adjusted, for example, the discharge frequency of the pulse voltage is adjusted by the frequency of the optical fiber trigger signal; the transformer and the magnetic compression circuit with the saturable inductor in the pre-breakdown module can also have multiple stages so as to realize higher peak voltage and shorter rising time of the leading edge of the pulse voltage.
Example 4
The embodiment provides a further specific implementation circuit of a magnetic switch pulse generator for electric pulse rock breaking, the circuit schematic diagram of which is shown in figure 5, and the magnetic switch pulse generator comprises a power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、CsTrigger circuit, pre-breakdown module, pulse transformer TP and load R0Magnetic switch MS0And a current source I0(ii) a Wherein, the power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、CsLoad R0Pulse transformer TP and magnetic switch MS0And a current source I0The functions and connection relationships of the flip-flop circuit are the same as those of embodiment 2, and this embodiment is not repeated, but different from embodiment 2, this embodiment provides a new flip-flop circuit and a pre-breakdown module, where the pre-breakdown module is composed of a boost capacitor C1～CnProtection resistor r1～r2nAnd an air gap switch G1～GnThe first air-gap switch circuit is taken as an example, the boost capacitor C1Protection resistor r1And a boost capacitor C2And a protective resistor r2Sequentially connected end to end, air gap switch G1Are respectively connected with a protective resistor r1And r2The n air gap switch circuits are connected in parallel to form a pre-breakdown module. The trigger circuit is driven by a voltage source u0Pulse transformer TR1、TR2Diode D1～D7Resistance R1～R3And a capacitor c1～c2And silicon controlled rectifier E0The IGBT drive board, the signal delay module and the trigger signal, and the voltage source u0And pulse transformer TR1Primary winding connection of, pulse transformer TR1And a secondary winding of D1～D4Formed shaping bridge circuit connection, protection resistor R1And a capacitor c2Diode D7Protection resistor R3Are connected in sequence to form a protection circuit and a protection resistor R1Is connected with a shaping bridge circuit to realize the capacitance c2Charging; capacitance c1Resistance R1、R2Form a buffer circuit, a buffer circuit and a silicon controlled rectifier E0After being connected in parallel, the silicon controlled rectifier E is connected with a protection circuit0The input end is connected with a diode D5、D6Silicon controlled rectifier E0The output end, the IGBT drive board, the signal delay module and the trigger signal module are sequentially connected, the trigger signal module is further connected with the switch, and the pulse transformer TR2The primary winding of the transformer is connected with a protection circuit, and the secondary winding of the transformer is connected with a first air gap switch G in the pre-breakdown module1Connected, air-gap switch G1The three electrodes trigger an air gap switch.
The working principle of this embodiment is explained below with reference to fig. 5: in the initial state, the Insulated Gate Bipolar Transistor (IGBT) drive board S is disconnected, and the capacitor C0Charging, capacitance CsThe discharge is in a fully discharged state. Insulated Gate Bipolar Transistor (IGBT) driver board S triggeringClosed under the control of signal, power supply U0Acting on the primary winding of the pulse transformer TP, the voltage of the secondary winding is the voltage at the two ends of the primary winding multiplied by the transformation ratio, and the capacitor CsIs also slowly charged. The secondary winding of the pulse transformer TP does not generate a trigger electrical signal due to the signal delay in the trigger circuit. Air gap switch G1～GnThe capacitor C is not broken down under the condition that the working voltage is the voltage of the secondary winding of the pulse transformer TP1～CnIn the parallel state, the voltages at their ends are each approximately equal to the voltage of the secondary winding of the pulse transformer TP. Capacitor C1～CnIs being slowly charged.
In the trigger circuit, the voltage source u0In the pulse transformer TR1After voltage transformation, the voltage passes through a diode D1～D4Form a trimming bridge and then protect the resistor R1Capacitance c2-a diode D7-a protective resistance R3Capacitor c2And (6) charging. Capacitor c in trigger circuit1Resistance R1、R2The branch is a buffer stage. When the trigger signal is delayed and controlled, the IGBT drive board generates pulse voltage to act on the controllable silicon E0The delay control time of the trigger signal is less than n stages of boost capacitors C1～CnThe charging time of (c). Controlled silicon E0Will be switched from off to on, the capacitor C2By means of thyristors E0Pulse transformer TR2The primary winding discharges. By the principle of electromagnetic induction, the pulse transformer TR2The required high-voltage trigger pulse is output, and because the diode is in an off state due to reverse bias, the capacitor c cannot be formed2-silicon controlled rectifier E0-a diode D5～D7Loop for discharging, diode D7Only in the capacitor c2And provides a path during charging. It is worth noting that the pulse transformer TR2The output voltage is larger than the boosting capacitor C in the pre-breakdown module1Charging voltage across and air gap switch G1The breakdown voltage of (c).
When the pulse signal generated by the trigger circuit acts on the three-electrode trigger switch G1In the upper stage, the switch G is triggered by three electrodes1Air gap node ofThe gas between kj is broken down. Air gap switch G after breakdown1One end of the capacitor C is grounded and boosted1The voltage difference between the two ends cannot change abruptly. Air gap switch G2The voltage at both ends is due to a boost capacitor C2The voltage difference between the two ends cannot change suddenly and the resistor r1～r2The isolation effect is 2 times of the output voltage of pulse transformer TP, and air gap switch G2The gas in between is also broken down rapidly. Similarly, the gas between the air gap switches of the later stages is broken down sequentially due to overvoltage, and finally the capacitor C is connected1～CnConnected in series to generate a higher pulse voltage to act on a load R0Two ends. If the power loss in the loop is neglected, the load R0The peak value of the pulse voltage at the two ends is about n times of the output voltage of the pulse transformer TP.
In the above process, the magnetic switch MS0The voltage on the magnetic core is positive, and the magnetic core is magnetized to the positive direction. Magnetic switch MS during the process of the load voltage rising to breakdown0Blocking high pulse voltages, Insulated Gate Bipolar Transistor (IGBT) driver board S and magnetic switch MS0The coplanar low-inductance lead ab in between is approximately just charged to the input voltage. With load R0Breakdown of (rock or liquid medium), sudden drop of load voltage, and boost capacitance C1～CnThe energy in between generates a large amount of thermal plasma in the breakdown channel inside the medium. Boost capacitor C1～CnProtection resistor r1～r2nAir gap switch G1～GnAnd a load R0The connection line efgh between the two is a high-voltage-resistant wire, so that the electric breakdown is ensured to occur in the load R0Inside. Shortly after breakdown, the magnetic switch MS0Saturating and driving the energy storage capacitor C through an Insulated Gate Bipolar Transistor (IGBT) driving board S0Is connected to a load R0Two ends, thereby realizing a load R0High voltage to high current (high energy) conversion across. Due to the large time constant of the charges in the discharge channel (plasma channel), the arc does not extinguish during this transition. Insulated Gate Bipolar Transistor (IGBT) drive board S and magnetic switch MS0And magnetic switch MS0And a load R0BetweenIs formed by coplanar low-induction leads ab and cd, thereby ensuring the load R0The internal current rises rapidly. Magnetic switch MS0After saturation, it is stored in capacitor C0And CsIs transferred to the load R0In the arc, the plasma channel expands rapidly due to the temperature increase, creating a stress wave and finally achieving rock breaking.
When the capacitance C0And CsIs transferred to the load R0When the power supply is turned off, the Insulated Gate Bipolar Transistor (IGBT) drive plate S is turned off, and the energy storage capacitor C0And recharging to prepare for the next pulse of the electric pulse generator. During this time, the magnetic switch MS0In the current source I0The power supply is supplied and the reset circuit is magnetized reversely and reaches an unsaturated state, thus completing a pulse working cycle of the electric pulse generator for breaking rocks.
Meanwhile, the circuit can be adjusted, for example, the discharge frequency of the pulse voltage is adjusted by the frequency of the optical fiber trigger signal; the delay control time of the trigger signal being used to supply the boost capacitor C1～CnCharging, but the delay control time of the trigger signal can be less than n-stage boosting capacitor C1～CnCharging time of, i.e. boost capacitor C1～CnFull charging may not be necessary, which may ensure that the pulse generator is designed to have a shorter rise time of the leading edge of the pulse voltage. Simultaneously loaded with R0The peak value of the pulse voltage at two ends can be adjusted by a protection resistor r in the transformer and the pre-breakdown module2n-1～r2nAir gap switch GnAnd a boost capacitor CnThe basic unit of composition is adjusted.
Example 5
The embodiment provides a further specific implementation circuit of the magnetic switch pulse generator for electric pulse rock breaking, the circuit schematic diagram of which is shown in fig. 6, and the magnetic switch pulse generator comprises a power supply U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、CsPre-breakdown module and controllable transformer TRMVLoad R0Magnetic switch MS0And a current source I0(ii) a It is composed ofIn, the power U0Insulated Gate Bipolar Transistor (IGBT) drive board S and capacitor C0、CsLoad R0Magnetic switch MS0And a current source I0The functions and connection relationships of the transformer and the pre-breakdown module are the same as those of embodiment 2, and the embodiment is not repeated, but different from embodiment 2, the embodiment provides a new circuit of the transformer and the pre-breakdown module, and the embodiment adopts the controllable transformer TRMVCapacitor C1～C4Magnetic switch MS1～MS3A transformer and a pre-breakdown module, a controllable transformer TRMVCapacitor C1、C2And magnetic switch MS1A controllable transformer TR forming a primary voltage doubling and magnetic compression unitMVIs connected with a capacitor C1、C2And a capacitance C1、C2Parallel connection, a capacitor C2And magnetic switch MS1Connecting; magnetic switch MS2Capacitor C3、C4Magnetic switch MS3Form a two-stage voltage-multiplying and magnetic compression unit, a magnetic switch MS2And a capacitor C3、C4Connected and a capacitor C3、C4Parallel connection, a capacitor C3And magnetic switch MS3Connecting; the primary voltage-multiplying unit and the secondary voltage-multiplying unit jointly form a transformer and a pre-breakdown module. Transformer TR in the present embodimentMVWinding, magnetic switch MS on0、MS1～MS3Is substantially saturable inductance and has hysteresis property.
The working principle of this embodiment is explained below with reference to fig. 6: in the initial state, the Insulated Gate Bipolar Transistor (IGBT) drive board S is disconnected, and the capacitor C0Charging, capacitance CsThe discharge is in a fully discharged state. Controllable transformer TRMVThe winding core is reset. An Insulated Gate Bipolar Transistor (IGBT) drive plate S is closed under the control of a trigger signal, and a power supply U0Acting on a controllable transformer TRMVThe voltage of the secondary winding is the voltage at two ends of the primary winding multiplied by the transformation ratio, and the transformer TR is controlledMVThe winding core is slowly converted into a saturated state from an unsaturated state, and the capacitor CsIs also slowly charged. Capacitor CsControllable transformer TR after chargingMVThe magnetic flux density in the winding core returns to the negative residual induction strength (i.e., -B in fig. 3)rAt (b) is prepared. Capacitor CsBy means of a controllable transformer TRMVCapacitor C1And C2And charging in parallel. Controllable transformer TRMVThe magnetic flux density in the winding core begins to go to the forward saturation flux density (i.e., B in FIG. 3)sWhere) increases, and when the capacitance C is increased1And C2Controllable transformer TR when charged to maximumMVThe windings reach saturation. Controllable transformer TRMVThe winding inductance of the Transformer (TR) is sharply reduced, and the Transformer (TR) is controlledMVCapacitor C with parallel secondary windings1By means of a transformer TR availableMVThe secondary winding realizes the rapid voltage polarity reversal when the capacitor C1When the voltage at both ends reaches the negative peak value, the capacitor C is enabled2And magnetic switch MS1The voltage at the junction jumps from the original zero potential to about 2 times the negative peak (if the capacitance C is1And C2Equal capacitance) of the magnetic switch MS1Saturation, capacitance C1And C2The pulse voltage (about 2 times negative peak value) at two ends of the series connection acts on the magnetic switch MS2Two ends. The first voltage doubling and pulse compression of the voltage are completed; magnetic switch MS during one stage of magnetic pulse compression2Not saturated, by adjusting the capacitance C1～C2And magnetic switch MS1The number of turns of the upper coil, the magnetic flux area and other variables make the magnetic switch MS when the primary magnetic compression voltage reaches the peak value2Just reaching saturation. Pulse voltage magnetic switch MS2Then passes through a capacitor C3～C4And a magnetic switch MS3And secondary boosting and pulse compression are carried out, so that the peak value of the pulse voltage is further improved, and the rising front edge pulse time is reduced. If the capacitance C1And C2Has equal capacitance and capacitance C3And C4When the capacitances of (1) are equal, the load R0The pulse voltage across both ends is about 4 times controllable transformer TRMVThe secondary winding terminal voltage. Followed by a load R0The voltage at the end rises rapidly until breakdown occurs.
In the above process, the magnetic switch MS0The voltage on the magnetic core is positive, and the magnetic core is magnetized to the positive direction. Magnetic switch MS during the process of the load voltage rising to breakdown0Blocking high pulse voltages, Insulated Gate Bipolar Transistor (IGBT) driver board S and magnetic switch MS0The coplanar low-inductance lead ab in between is approximately just charged to the input voltage. With load R0Breakdown of (rock or liquid medium), sharp drop of load voltage, from controllable transformer TRMVThe current flowing out and the capacitance C1～C4The stored energy generates a large amount of thermal plasma in the breakdown channel inside the medium. Capacitor C1～C4Has a discharge current direction opposite to the initial charge current direction, and the discharge current in the opposite direction is just opposite to the controllable transformer TRMVMagnetic switch MS1～MS3The magnetic core of (2) is reset. Thus in the controllable transformer TRMVMagnetic switch MS1～MS3And extra reset circuits are not needed to be added at the two ends, so that the circuit is simplified. Controllable transformer TRMVCapacitor C1～C4Magnetic switch MS1～MS3And a load R0The connection line efgh between the two is a pulse high voltage resistant wire, so that the electric breakdown is ensured to occur in the load R0Inside. Magnetic switch MS0The voltage of (1) is still positive, so that the magnetic core of the magnetic switch is further magnetized to the positive direction, and the magnetic switch MS can be ensured0Saturation is reached before the arc is extinguished.
Shortly after breakdown, the magnetic switch MS0Saturating and driving the energy storage capacitor C through an Insulated Gate Bipolar Transistor (IGBT) driving board S0Is connected to a load R0Two ends, thereby realizing a load R0High voltage to high current (high energy) conversion across. Due to the large time constant of the charges in the discharge channel (plasma channel), the arc does not extinguish during this transition. Insulated Gate Bipolar Transistor (IGBT) drive board S and magnetic switch MS0And magnetic switch MS0And a load R0The connection between them is made of coplanar low-inductance leads ab and cd, thus ensuring the rapid rise of current inside the load. Magnetic switch MS0After saturation, it is stored in capacitor C0And CsIs transferred to the load R0In the arc, the plasma channel expands rapidly due to the temperature increase, creating a stress wave and finally achieving rock breaking.
When the capacitance C0And CsIs transferred to the load R0When the power supply is turned off, the Insulated Gate Bipolar Transistor (IGBT) drive plate S is turned off, and the energy storage capacitor C0And recharging to prepare for the next pulse of the electric pulse generator. During this time, the magnetic switch MS0In the current source I0The power supply is supplied and the reset circuit is magnetized reversely and reaches an unsaturated state, thus completing a pulse working cycle of the electric pulse generator for breaking rocks.
It is noted that the above circuit can be adjusted, for example, the discharge frequency of the pulse voltage is adjusted by the frequency of the optical fiber trigger signal; the transformer and the voltage-multiplying and magnetic pulse compression circuit which are arranged in the pre-breakdown module and contain the saturable inductance winding can also have multiple stages, and finally the purposes of higher peak voltage and shorter pulse voltage leading edge rise time are achieved.
From the above embodiments, it can be seen that the electric pulse generator circuit designed according to the invention combines the specific process and mechanism of electric pulse rock breaking, the rock breaking energy consumption efficiency is high, and meanwhile, the specific and flexible circuit structure of the electric pulse generator can be designed according to the mode and load type of electric pulse rock breaking. The invention has strong pertinence, flexibility and portability.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (10)
1. A magnetically switched pulse generator for use in electrical pulse rock breaking, comprising:
the power supply is used as an energy source of the pulse generator and provides charging voltage;
the rectification filtering module is connected to the output end of the power supply and is used for rectifying and filtering the charging voltage output by the power supply;
the switch module is connected to the output end of the rectifying and filtering module and is used for controlling the discharge frequency of the pulse generator;
the energy storage module is connected to the output end of the rectifying and filtering module, and charges the energy storage module by the charging voltage rectified and filtered by the rectifying and filtering module, and the energy storage module stores energy;
the primary winding of the transformer is connected to the output end of the switch module, is connected with the energy storage module in parallel and is used for preliminarily boosting the voltage;
the pre-breakdown module is connected in parallel with the secondary winding of the transformer and is used for continuously boosting and sharpening the voltage of the transformer after primary boosting;
the load is connected to the output end of the pre-breakdown module in parallel, and the pre-breakdown module provides instantaneous high pulse voltage for breaking down the load to form a channel in the load;
the magnetic switch module is connected to the output end of the switch module, connected with the load and used for controlling the energy storage module to discharge to the load; the magnetic switch module is switched off before the pre-breakdown module breaks down the load, and the magnetic switch module is switched on before and after the pre-breakdown module breaks down the load; and the energy storage module discharges electricity to a load through the switch module and the magnetic switch module after the magnetic switch module is closed, so that rock breaking is realized.
2. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the switch module comprises a switch and a trigger circuit connected with the switch, and the trigger circuit controls the on-off of the switch by receiving the quantity and time interval of trigger signals so as to control the discharge frequency of the electric pulse generator.
3. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the load is a liquid medium or rock; when the load is a liquid medium, the pulse sharpening effect of the pre-breakdown module can be relatively weakened, and a larger pulse voltage peak value is ensured; when the load is liquid rock, the pre-breakdown module has a strong pulse sharpening effect, and a large pulse voltage peak value is ensured.
4. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the magnetic switch module comprises a magnetic switch and a reset circuit connected with the magnetic switch, and the reset circuit controls the magnetic switch to be disconnected after the energy storage module finishes discharging the load.
5. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 2, characterised in that: the rectification filter module and the switch are realized by an insulated gate bipolar transistor driving board.
6. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the energy storage module is realized by adopting two capacitor banks, wherein one capacitor bank is connected to two ends of a power supply; the other capacitor bank is connected between the output of the switch and the primary winding of the transformer.
7. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the transformer adopts a pulse transformer.
8. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the pre-breakdown module can be realized by adopting an LC circuit and an LC pulse compression circuit, and an inductor in the LC pulse compression circuit adopts a saturable inductor.
9. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 1, characterised in that: the transformer and the pre-breakdown module can be realized by adopting a transformer circuit or a magnetic switch circuit;
the transformer circuit comprises a first adjustable transformer and a second adjustable transformer, wherein a primary winding of the first adjustable transformer is connected with the switch module, a secondary winding of the first adjustable transformer is connected with a primary winding of the second adjustable transformer through a capacitor, and a secondary winding of the second adjustable transformer is connected with a load through a capacitor;
the magnetic switch circuit comprises a third adjustable transformer, a first magnetic switch, a second magnetic switch and a third magnetic switch, wherein a primary winding of the third adjustable transformer is connected with the switch module, a secondary winding of the third adjustable transformer is connected with a first capacitor and a second capacitor in parallel, the second capacitor is connected with the first magnetic switch, a grounding end of the first capacitor is connected with the second magnetic switch, output ends of the first magnetic switch and the second magnetic switch are connected with a third capacitor and a fourth capacitor in parallel, the fourth capacitor is connected with the third magnetic switch, an output end of the third magnetic switch is connected with an inductor and a load, a grounding end of the third capacitor is connected with the inductor, and the load is connected with the inductor in parallel.
10. A magnetically switched pulse generator for breaking rock by electrical pulses according to claim 2, characterised in that: the pre-breakdown module can be realized by adopting a plurality of air gap switch circuits connected in parallel, each air gap switch circuit comprises an air gap switch, a first boosting capacitor, a second boosting capacitor, a first protection resistor and a second protection resistor, the first boosting capacitor, the first protection resistor, the second boosting capacitor and the second protection resistor are sequentially connected end to end, and two ends of each air gap switch are respectively connected with the output ends of the first protection resistor and the second protection resistor;
the pre-breakdown module is characterized in that a gas gap switch in a first gas gap switch circuit is connected with a trigger circuit, the trigger circuit comprises a voltage source, a first pulse transformer, a shaping bridge circuit, a buffer circuit, a protection circuit, a silicon controlled rectifier, a second pulse transformer, an IGBT (insulated gate bipolar transistor) drive board, a signal delay module and a trigger signal module, the voltage source is connected with a primary winding of the first pulse transformer, a secondary winding of the first pulse transformer is connected with the shaping bridge circuit, the buffer circuit is connected with the protection circuit after being connected with the silicon controlled rectifier in parallel, the primary winding of the second pulse transformer is connected with the protection circuit, the secondary winding of the second pulse transformer is connected with the gas gap switch, the silicon controlled rectifier, the IGBT drive board, the signal delay module and the trigger signal module are sequentially connected, and the trigger signal module is further connected with the switch.
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| CN117792142A (en) * | 2024-02-28 | 2024-03-29 | 中国空气动力研究与发展中心高速空气动力研究所 | High-power high-frequency pulse plasma power supply and charging and discharging method thereof |
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Cited By (2)
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| CN117792142A (en) * | 2024-02-28 | 2024-03-29 | 中国空气动力研究与发展中心高速空气动力研究所 | High-power high-frequency pulse plasma power supply and charging and discharging method thereof |
| CN117792142B (en) * | 2024-02-28 | 2024-05-14 | 中国空气动力研究与发展中心高速空气动力研究所 | High-power high-frequency pulse plasma power supply and charging and discharging method thereof |
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