Capacitive energy storage type pulse power supply

Abstract

The invention provides a capacitive energy storage type pulse power supply, which comprises a direct-current power supply, a plurality of LCR oscillation units, a plurality of switches and a controller, the direct-current power supply is used for charging each LCR oscillation unit; wherein the charging voltages of the LCR oscillation units are the same, and the frequency of the ith LCR oscillation unit is fi = f0 * [1 + 2 (i-1)]; f0 is the preset frequency, i is equal to 1, 2, 3... n, and n is the number of the LCR oscillation units. And the LCR oscillation units output rectangular wave current in parallel to supply power to a load. Based on the Fourier theory, a plurality of LCR oscillation units are connected in parallel, a plurality of sine wave signals with different frequencies are generated and superposed to output rectangular wave current, the gradient of the rising edge and the falling edge of the rectangular wave is high, and the launching performance of the electromagnetic rail gun is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pulse power supply, and in particular to a capacitor energy storage type pulse power supply. Background Art

[0002] The electromagnetic railgun is a new concept kinetic weapon that uses the electromagnetic force of a large pulse current to directly accelerate macroscopic projectiles. It can accelerate macroscopic projectiles to more than 2 km / s and has broad application prospects in key defense, anti-armor, ultra-long-range rapid strikes, etc. During the launch of the electromagnetic railgun, in order to obtain a constant acceleration force, the electromagnetic railgun requires a pulse power supply (PPS) to provide a flat-top rectangular wave current drive.

[0003] In the prior art, reference Figure 1 The pulse power supply in the electromagnetic railgun adopts the pulse shaping network (PFN) power supply, which is composed of multiple pulse shaping units that discharge to the load under the timing trigger control. The pulse currents controlled by multiple timing triggers synthesize a current waveform that is approximately trapezoidal on the electromagnetic railgun load. Figure 2 , because the freewheeling silicon stack is connected in parallel next to the capacitor, the current drop section is the slow attenuation process of the LR circuit, and the rising and falling edges are not steep enough. The rising edge is too slow, and the armature current is not accumulated enough in the initial launch state, resulting in the aluminum armature being peeled off in blocks due to friction, affecting subsequent launch; the falling edge is too slow, and the current intensity is still very high when the armature leaves the barrel, and a large amount of electromagnetic energy is dissipated in the form of arcs, resulting in low launch efficiency, and the arc radiation characteristic information is not conducive to the concealment of the weapon system. Summary of the invention

[0004] The embodiment of the present invention provides a capacitor energy storage type pulse power supply to solve the problem in the prior art that the rising edge and the falling edge of the rectangular wave current output by the pulse power supply are not steep enough, which affects the launch performance of the electromagnetic rail gun.

[0005] In a first aspect, an embodiment of the present invention provides a capacitor energy storage type pulse power supply, including: a DC power supply, a plurality of LCR oscillation units, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a controller;

[0006] The first end of each LCR oscillation unit is connected to the first end of the fifth switch, the second end of the fifth switch forms the first output end of the capacitor energy storage type pulse power supply, the second end of each LCR oscillation unit is connected to the first end of the sixth switch, and the second end of the sixth switch forms the second output end of the capacitor energy storage type pulse power supply;

[0007] The positive electrode of the DC power supply is connected to the first end of the charging capacitor through the first switch, and the negative electrode of the DC power supply is connected to the second end of the charging capacitor through the second switch;

[0008] The positive electrode of the DC power supply is also connected to the second end of the charging capacitor through the third switch, and the negative electrode of the DC power supply is also connected to the first end of the charging capacitor through the fourth switch; wherein the charging capacitor is a capacitor in any LCR oscillation unit;

[0009] The controller is respectively connected to the control end of the first switch, the control end of the second switch, the control end of the third switch, the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch;

[0010] The controller is used to control the first switch, the second switch, the third switch and the fourth switch so that the DC power supply charges each LCR oscillation unit forward or reversely; the controller is also used to control the fifth switch and the sixth switch so that the first output end and the second output end of the capacitor energy storage type pulse power supply output rectangular wave current to supply power to the load; the load is equivalent to a load inductor and a load resistor connected in series;

[0011] Among them, the charging voltage of each LCR oscillator unit is the same, and the frequency of the i-th LCR oscillator unit is: f i =f0*[1+2(i-1)]; f0 is the preset frequency, i=1,2,3…,n, n is the number of LCR oscillator units.

[0012] Optionally, the LCR oscillation unit includes: a first capacitor and a first inductor;

[0013] The first capacitor and the first inductor are connected in series between the first end of the LCR oscillation unit and the second end of the LCR oscillation unit;

[0014] Wherein, the charging capacitor is any first capacitor.

[0015] Optionally, the inductance of the first inductor in each LCR oscillation unit is the same;

[0016] The charging voltage of the first capacitor in each LCR oscillation unit is the same;

[0017] The capacitance of the first capacitor in the i-th LCR oscillator unit is:

[0018] Wherein, C0 is a preset capacitance value.

[0019] Optionally, the calculation formula of the preset capacitance value C0 is:

[0020]

[0021] Where, T is the pulse width of the rectangular wave current output by the capacitor energy storage pulse power supply, L r is the loop inductance.

[0022] Optionally, the inductance of the first inductor in each LCR oscillation unit is not less than 5 times the inductance of the load inductor;

[0023] The line resistance of each LCR oscillation unit is not greater than 5 times the resistance of the load resistance.

[0024] Optionally, the inductance of the first inductor in each LCR oscillation unit is 9 times the inductance of the load inductor.

[0025] Optionally, the line resistance of each LCR oscillation unit is no more than 1 mΩ.

[0026] Optionally, the controller is specifically used for:

[0027] When receiving the first charging instruction, the third switch and the fourth switch are controlled to be disconnected, and the first switch and the second switch are controlled to be closed;

[0028] When it is detected that the voltage across the LCR oscillation unit reaches a first preset voltage, the first switch and the second switch are both controlled to be disconnected;

[0029] When receiving the first discharge instruction, controlling the fifth switch and the sixth switch to be closed;

[0030] When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch and the sixth switch are both controlled to be disconnected;

[0031] When receiving the second charging instruction, the first switch and the second switch are controlled to be disconnected, and the third switch and the fourth switch are controlled to be closed;

[0032] When it is detected that the voltage across the LCR oscillation unit reaches a second preset voltage, the third switch and the fourth switch are both controlled to be disconnected;

[0033] When receiving the second discharge instruction, controlling the fifth switch and the sixth switch to be closed;

[0034] When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch and the sixth switch are controlled to be disconnected.

[0035] The embodiment of the present invention provides a capacitor energy storage type pulse power supply. The capacitor energy storage type pulse power supply includes: a DC power supply, a plurality of LCR oscillation units, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a controller; the first end of each LCR oscillation unit is connected to the first end of the fifth switch, and the second end of the fifth switch forms the first output end of the capacitor energy storage type pulse power supply, the second end of each LCR oscillation unit is connected to the first end of the sixth switch, and the second end of the sixth switch forms the second output end of the capacitor energy storage type pulse power supply; the positive electrode of the DC power supply is connected to the first end of the charging capacitor through the first switch, and the negative electrode of the DC power supply is connected to the second end of the charging capacitor through the second switch; the positive electrode of the DC power supply is also connected to the second end of the charging capacitor through the third switch, and the negative electrode of the DC power supply is also connected to the charging capacitor through the fourth switch. The controller is connected to the first end of the capacitor; wherein the charging capacitor is a capacitor in any LCR oscillation unit; the controller is respectively connected to the control end of the first switch, the control end of the second switch, the control end of the third switch, the control end of the fourth switch, the control end of the fifth switch and the control end of the sixth switch; the controller is used to control the first switch, the second switch, the third switch and the fourth switch so that the DC power supply charges each LCR oscillation unit forward or reversely; the controller is also used to control the fifth switch and the sixth switch so that the first output end and the second output end of the capacitor energy storage type pulse power power supply output rectangular wave current to supply power to the load; the load is equivalent to a load inductor and a load resistor connected in series; wherein the charging voltage of each LCR oscillation unit is the same, and the frequency of the i-th LCR oscillation unit is: f i =f0*[1+2(i-1)]; f0 is the preset frequency, i=1,2,3…,n, n is the number of LCR oscillation units. The embodiment of the present invention is based on Fourier theory, and multiple LCR oscillation units are connected in parallel to generate multiple near-sinusoidal currents of different frequencies to synthesize into rectangular wave currents. The controller controls the on and off of each switch so that the capacitor energy storage type pulse power supply outputs a rectangular wave current. The rectangular wave current output by the capacitor energy storage type pulse power supply has a higher rising edge steepness, and there will be no block peeling of the aluminum armature during the initial launch; at the same time, the steepness of the falling edge is also higher. When the rectangular wave current drives the rail gun, the current instantly returns to zero when the projectile leaves the barrel, and no arc discharge is formed, which improves the launch efficiency and launch speed, while reducing the risk of being detected by the enemy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 It is a schematic diagram of the circuit structure of a pulse shaping network in the prior art;

[0038] Figure 2 yes Figure 1 The waveform diagram of the rectangular wave current output by the capacitor energy storage type pulse power supply shown;

[0039] Figure 3 It is a circuit structure diagram of a capacitor energy storage type pulse power supply provided by an embodiment of the present invention;

[0040] Figure 4 It is a waveform diagram of the rectangular wave current output by the capacitor energy storage type pulse power supply provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0042] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0043] The following is a detailed description of the implementation of the present invention in conjunction with the specific drawings:

[0044] Figure 3 A schematic diagram of the structure of a capacitor energy storage type pulse power supply provided in an embodiment of the present invention.

[0045] Reference Figure 3 The capacitor energy storage type pulse power supply includes: a DC power supply S, a plurality of LCR oscillation units (U1, U2, U3, U4, U5...), a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6 and a controller;

[0046] The first end of each LCR oscillation unit is connected to the first end of the fifth switch K5, and the second end of the fifth switch K5 forms the first output end of the capacitor energy storage type pulse power supply. The second end of each LCR oscillation unit is connected to the first end of the sixth switch K6, and the second end of the sixth switch K6 forms the second output end of the capacitor energy storage type pulse power supply.

[0047] The positive electrode of the DC power source S is connected to the first end of the charging capacitor through the first switch K1, and the negative electrode of the DC power source S is connected to the second end of the charging capacitor through the second switch K2;

[0048] The positive electrode of the DC power supply S is also connected to the second end of the charging capacitor through the third switch K3, and the negative electrode of the DC power supply S is also connected to the first end of the charging capacitor through the fourth switch K4; wherein the charging capacitor is a capacitor in any LCR oscillation unit (for example, C11);

[0049] The controller is respectively connected to the control end of the first switch K1, the control end of the second switch K2, the control end of the third switch K3, the control end of the fourth switch K4, the control end of the fifth switch K5 and the control end of the sixth switch K6;

[0050] The controller is used to control the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 so that the DC power supply S charges each LCR oscillation unit forward or reversely; the controller is also used to control the fifth switch K5 and the sixth switch K6 so that the first output end and the second output end of the capacitor energy storage type pulse power supply output rectangular wave current to supply power to the load; the load is equivalent to a load inductor Lg and a load resistor Rg connected in series;

[0051] Among them, the charging voltage of each LCR oscillator unit is the same, and the frequency of the i-th LCR oscillator unit is: f i =f0*[1+2(i-1)]; f0 is the preset frequency, i=1,2,3…,n, n is the number of LCR oscillator units.

[0052] It should be noted that the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5 and the sixth switch K6 may all be normally open switches, that is, the switches are in an open state in a default state (when there is no control signal at the control end).

[0053] French mathematician Fourier believed that any periodic function can be represented by an infinite series consisting of sine and cosine functions. Mathematically, the Fourier series of a rectangular square wave can be expressed as follows:

[0054]

[0055] Based on this, a rectangular wave can be expanded into the algebraic sum of a series of sine waves with different frequencies and amplitudes.

[0056] In physics, a slowly decaying near-sine wave can be generated by an LCR oscillation circuit.

[0057] Based on the above theory, a plurality of LCR oscillation units are provided in the embodiment of the present invention to generate a plurality of approximate sinusoidal currents of different frequencies. The frequencies of the respective LCR oscillation units are f0, 3f0, 5f0, 7f0, 9f0..., and a plurality of approximate sinusoidal currents of suitable frequencies and suitable amplitudes are connected in parallel to obtain an approximate rectangular wave. At the same time, the controller controls the capacitor energy storage type pulse power supply to supply power to the load by controlling the fifth switch K5 and the sixth switch K6, and controls the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 to charge the capacitors in the respective LCR oscillation units forward or reversely, so as to collect the residual energy. Reference Figure 4 The rectangular wave current has steep rising and falling edges, which is suitable for electromagnetic rail gun launch. The aluminum armature will not have block peeling during the initial launch; at the same time, the steepness of the falling edge is also higher. When the rectangular wave current drives the rail gun, the current instantly returns to zero when the projectile leaves the barrel, and no arc discharge is formed, which avoids energy waste, improves the launch efficiency and initial launch velocity, and reduces the risk of being detected by the enemy.

[0058] In a possible implementation, the LCR oscillation unit may include: a first capacitor (C11, C12, C13, C14, C15, ...) and a first inductor (L11, L12, L13, L14, L15, ...);

[0059] The first capacitor and the first inductor are connected in series between the first end of the LCR oscillation unit and the second end of the LCR oscillation unit;

[0060] Wherein, the charging capacitor is any first capacitor.

[0061] refer to Figure 3 Since the winding of the first inductor has resistance, the connecting wires between the components also have resistance. Figure 3 , the line resistance of each LCR oscillation unit can be equivalent to R11, R12, R13, R14, R15, ... (wherein R11, R12, R13, R14, R15, ... are not real resistors). Therefore, in the embodiment of the present invention, the first capacitor, the first inductor and the line resistance are connected in series to form a series resonance (for example, C11, R11 and L11 form a series resonance) to effectively generate an approximate sine wave, and the circuit structure is simple and the circuit cost is low. The circuit structure of each LCR oscillation unit is the same, which is conducive to maintaining the consistency of the circuit.

[0062] The charging capacitor may be any first capacitor. Figure 3 The charging capacitor may be the first capacitor (C11) in the first LCR oscillation unit, and the DC power supply S charges each LCR oscillation unit through the first capacitor (C11) in the first LCR oscillation unit.

[0063] refer to Figure 3 , exemplarily, the charging capacitor is the first capacitor (C11) in the first LCR oscillation unit, and the DC power supply S is connected to both ends of the first capacitor (C11) in the first LCR oscillation unit through the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4. For specific connection relationship, refer to Figure 3 , I will not go into details here.

[0064] In a possible implementation, the controller may be specifically configured to:

[0065] S101: When a first charging instruction is received, the third switch K3 and the fourth switch K4 are controlled to be disconnected, and the first switch K1 and the second switch K2 are controlled to be closed;

[0066] based on Figure 3 When receiving a first charging instruction (the first charging instruction is used to instruct each LCR oscillation unit to be forward charged), the third switch K3 and the fourth switch K4 are controlled to be disconnected, and the first switch K1 and the second switch K2 are controlled to be closed, and the DC power supply S is used to forward charge each LCR oscillation unit;

[0067] S102: When it is detected that the voltage across the LCR oscillation unit reaches a first preset voltage, the first switch K1 and the second switch K2 are both controlled to be disconnected, thereby completing one charging operation;

[0068] When it is detected that the voltage across the LCR oscillation unit reaches a first preset voltage (positive voltage), the first switch K1 and the second switch K2 are disconnected, and one charge is completed, waiting for discharge (standby).

[0069] S103: When receiving the first discharge instruction, controlling the fifth switch K5 and the sixth switch K6 to be closed;

[0070] When it is necessary to discharge to the load, that is, when the first discharge instruction is received, the fifth switch K5 and the sixth switch K6 are both closed, the capacitor energy storage type pulse power supply outputs a positive flat-top rectangular wave current, the current on the load rises rapidly, driving the electromagnetic railgun armature to accelerate, and the railgun starts to fire.

[0071] S104: When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch K5 and the sixth switch K6 are both controlled to be disconnected to complete one discharge;

[0072] When the rectangular wave current reaches the falling edge, the electromagnetic rail gun armature just moves to the muzzle position. At this time, if it is detected that the absolute value of the output current of the capacitor energy storage pulse power supply is less than the preset current (that is, it drops to 0), then one discharge is completed, the fifth switch K5 and the sixth switch K6 are disconnected, and the discharge to the load is stopped, completing a launch mission. For specific waveforms, refer to Figure 4 .

[0073] S105: When receiving the second charging instruction, the first switch K1 and the second switch K2 are controlled to be disconnected, and the third switch K3 and the fourth switch K4 are controlled to be closed;

[0074] After the first transmission mission is completed, the residual energy is stored in each first capacitor in a reverse energy storage manner (at this time, the voltage of the charging capacitor C11 is negative). In order to collect the residual energy, the residual energy can be used in the next transmission. When the second charging instruction is received (the second charging instruction is used to indicate reverse charging for each LCR oscillation unit), the first switch K1 and the second switch K2 are controlled to be disconnected, and the third switch K3 and the fourth switch K4 are controlled to be closed, and the DC power supply S reverse charges each LCR oscillation unit.

[0075] S106: When it is detected that the voltage across the LCR oscillation unit reaches the second preset voltage, the third switch K3 and the fourth switch K4 are both controlled to be disconnected, thereby completing the secondary charging;

[0076] When it is detected that the voltage across the LCR oscillation unit reaches the second preset voltage (negative voltage), the third switch K3 and the fourth switch K4 are disconnected to complete the secondary charging and wait for discharging (standby).

[0077] S107: When receiving the second discharge instruction, the fifth switch K5 and the sixth switch K6 are controlled to be closed;

[0078] When it is necessary to discharge to the load, that is, when the second discharge instruction is received, the capacitor energy storage type pulse power supply outputs a negative flat-top rectangular wave current to discharge to the load.

[0079] S108: When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch K5 and the sixth switch K6 are controlled to be disconnected to complete the secondary discharge.

[0080] Similarly, when the absolute value of the output current of the capacitor energy storage pulse power supply is detected to be less than the preset current, the secondary discharge is completed and the secondary emission task is completed. For specific waveforms, refer to Figure 4 .

[0081] After the second launch mission is completed, the remaining energy is stored in each first capacitor in a positive energy storage manner (at this time, the voltage of the charging capacitor C11 is positive). When the third launch mission is required, each LCR oscillation unit is positively charged again, and so on and so forth, and steps S101 to S108 are repeatedly executed to complete multiple launch missions. The capacitor energy storage type pulse power supply can realize the output of positive and negative rectangular wave currents without setting a freewheeling silicon stack, and is used to drive the electromagnetic rail gun, with good driving effect, so that the electromagnetic rail gun has better safety and stability, and is launched efficiently.

[0082] It should be noted that the preset current can be set according to actual application requirements and is close to 0.

[0083] In a possible implementation manner, the inductance of the first inductor in each LCR oscillation unit is the same;

[0084] The charging voltage of the first capacitor in each LCR oscillation unit is the same;

[0085] The capacitance of the first capacitor in the i-th LCR oscillator unit is:

[0086] Wherein, C0 is a preset capacitance value.

[0087] In the embodiment of the present invention, the first inductor is mainly used for wave modulation, the inductance of each first inductor can be the same, the line resistance of each LCR oscillation unit is small, and is not greater than 1mΩ. The frequency of each approximate sine wave is affected by the capacitance of the first capacitor.

[0088] The frequency of the i-th LCR oscillator unit is: f i =f0*[1+2(i-1)], that is, the frequencies of each LCR oscillation unit are f0, 3f0, 5f0, 7f0, 9f0…

[0089] The line resistance of each LCR oscillation unit is small, based on the calculation formula of the LC oscillation period Assuming that the capacitance of the first capacitor (C11) in the first LCR oscillator unit is C0, the capacitances of the first capacitors are:

[0090] That is to say

[0091] In a possible implementation, the calculation formula for the preset capacitance value C0 may be:

[0092]

[0093] Where, T is the pulse width of the rectangular wave current output by the capacitor energy storage pulse power supply, L r is the loop inductance.

[0094] Similarly, the line resistance of each LCR oscillation unit is small, and the calculation formula based on the LC oscillation period is Pulse width of rectangular wave current

[0095] From this, we can deduce that:

[0096]

[0097] In the embodiment of the present invention, the pulse width of the rectangular wave current output by the capacitor energy storage type pulse power supply can be adjusted by adjusting the capacitance of each first capacitor, thereby achieving the output of rectangular wave currents of different widths to meet different acceleration requirements of the electromagnetic railgun.

[0098] For example, a 12.5m long electromagnetic rail gun, a muzzle velocity of 2.5km / s, and an acceleration time of 10ms, corresponds to a set of first capacitors; a 1.25m long electromagnetic rail gun, a muzzle velocity of 2.5km / s, and an acceleration time of 1ms, corresponds to another set of first capacitors.

[0099] It should be noted that the loop inductance includes the first inductance (inductance is L1), the load inductance Lg (inductance is L g ) and the stray inductance of the loop. Since the stray inductance of the loop is small, it can be ignored. Then the loop inductance L r ≈L1+L g .

[0100] In a possible implementation manner, the inductance of the first inductor in each LCR oscillation unit is not less than 5 times the inductance of the load inductor Lg;

[0101] The line resistance of each LCR oscillation unit is not greater than 5 times the resistance of the load resistance Rg.

[0102] In the embodiment of the present invention, the resistance of the line resistor of each LCR oscillation unit is relatively small, not greater than 5 times the resistance of the load resistor Rg, which can effectively ensure the steepness of the rising edge and the falling edge of the rectangular wave.

[0103] In a possible implementation, the inductance of the first inductor in each LCR oscillation unit may be 9 times the inductance of the load inductor Lg.

[0104] In a possible implementation manner, the line resistance of each LCR oscillation unit is no more than 1 mΩ.

[0105] The resistance value of the line resistor of each LCR oscillation unit should be as small as possible, and may not be greater than 1mΩ.

[0106] Exemplarily, the electromagnetic rail gun load has a characteristic inductance of 0μH to 4μH and a characteristic resistance of 0mΩ to 0.5mΩ. The load inductance Lg is 4μH, the first inductance can be 36μH, the line resistance of each LCR oscillation unit can be 1mΩ, and the charging voltage of each LCR oscillation unit is 40kV.

[0107] Taking the 5-level LCR oscillation unit as an example, for a 12.5m long electromagnetic rail gun, the muzzle velocity is 2.5km / s, the acceleration time is 10ms, that is, the pulse width of the rectangular wave current output by the capacitor energy storage pulse power supply is 10ms, then the period of the first LCR oscillation unit is 20ms (50Hz), and C0=253.3mF (50Hz) is calculated. The capacitance values ​​of the first capacitors in other LCR oscillation units are 28.144mF (150Hz), 10.132mF (250Hz), 5.169mF (350Hz), and 3.127mF (450Hz), respectively.

[0108] The ratio of each first capacitor is: The energy storage ratio is: The ratio of the peak currents is: It just satisfies the coefficient ratio in the Fourier expansion. For specific parameters, please refer to Table 1.

[0109] Table 1 Parameters of the first circuit

[0110]

[0111] In another possible implementation, the electromagnetic railgun load has a characteristic inductance of 0μH to 4μH and a characteristic resistance of 0mΩ to 0.5mΩ, the load inductance Lg is 0.4μH, the first inductance may be 3.6μH, the line resistance of each LCR oscillation unit may be 1mΩ, and the charging voltage of each LCR oscillation unit may be 4kV.

[0112] Taking the 5-level LCR oscillation unit as an example, for a 1.25m long electromagnetic rail gun, the muzzle velocity is 2.5km / s, the acceleration time is 1ms, that is, the pulse width of the rectangular wave current is 1ms, then the period of the first LCR oscillation unit is 2ms (0.5kHz), and C0=25.33mF (0.5kHz) is calculated. The capacitance values ​​of the first capacitors in other LCR oscillation units are 2.8144mF (1.5kHz), 1.0132mF (2.5kHz), 0.5169mF (3.5kHz), and 0.3127mF (4.5kHz), respectively. For specific parameters, refer to Table 2.

[0113] Table 2 Second circuit parameter table

[0114]

[0115] Based on the above, by setting different values ​​of the first capacitor, the output of rectangular wave current with higher steepness and different pulse widths can be achieved, thereby obtaining a better driving effect and meeting different military requirements.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A capacitor energy storage type pulse power supply, characterized in that: include: A DC power supply, a plurality of LCR oscillation units, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a controller; The first end of each LCR oscillation unit is connected to the first end of the fifth switch, the second end of the fifth switch forms the first output end of the capacitor energy storage type pulse power supply, the second end of each LCR oscillation unit is connected to the first end of the sixth switch, and the second end of the sixth switch forms the second output end of the capacitor energy storage type pulse power supply; The positive electrode of the DC power supply is connected to the first end of the charging capacitor through the first switch, and the negative electrode of the DC power supply is connected to the second end of the charging capacitor through the second switch; The positive electrode of the DC power supply is also connected to the second end of the charging capacitor through the third switch, and the negative electrode of the DC power supply is also connected to the first end of the charging capacitor through the fourth switch; wherein the charging capacitor is a capacitor in any LCR oscillation unit; The controller is respectively connected to a control end of the first switch, a control end of the second switch, a control end of the third switch, a control end of the fourth switch, a control end of the fifth switch, and a control end of the sixth switch; The controller is used to control the first switch, the second switch, the third switch and the fourth switch so that the DC power supply charges each LCR oscillation unit forward or reversely; the controller is also used to control the fifth switch and the sixth switch so that the first output end and the second output end of the capacitor energy storage type pulse power supply output rectangular wave current to supply power to the load; the load is equivalent to a load inductor and a load resistor connected in series; Among them, the charging voltage of each LCR oscillator unit is the same, and the frequency of the i-th LCR oscillator unit is: f i =f0*[1+2(i-1)]; f0 is the preset frequency, i=1,2,3…,n, n is the number of the LCR oscillation units.

2. The capacitor energy storage type pulse power supply according to claim 1, characterized in that: The LCR oscillation unit includes: a first capacitor and a first inductor; The first capacitor and the first inductor are connected in series between the first end of the LCR oscillation unit and the second end of the LCR oscillation unit; Wherein, the charging capacitor is any one of the first capacitors.

3. The capacitor energy storage type pulse power supply as claimed in claim 2, characterized in that: The inductance of the first inductor in each LCR oscillation unit is the same; The charging voltage of the first capacitor in each LCR oscillation unit is the same; The capacitance of the first capacitor in the i-th LCR oscillator unit is: Wherein, C0 is a preset capacitance value.

4. The capacitor energy storage type pulse power supply as claimed in claim 3, characterized in that: The calculation formula of the preset capacitance value C0 is: Wherein, T is the pulse width of the rectangular wave current output by the capacitor energy storage type pulse power supply, L r is the loop inductance.

5. The capacitor energy storage type pulse power supply as claimed in claim 3, characterized in that: The inductance of the first inductor in each LCR oscillation unit is not less than 5 times the inductance of the load inductor; The line resistance of each LCR oscillation unit is no more than 5 times the resistance of the load resistance.

6. The capacitor energy storage type pulse power supply as claimed in claim 5, characterized in that: The inductance of the first inductor in each LCR oscillation unit is 9 times the inductance of the load inductor.

7. The capacitor energy storage type pulse power supply as claimed in claim 3, characterized in that: The line resistance of each LCR oscillation unit is no more than 1mΩ.

8. The capacitor energy storage type pulse power supply according to any one of claims 1 to 7, characterized in that: The controller is specifically used for: When receiving a first charging instruction, controlling the third switch and the fourth switch to be disconnected, and controlling the first switch and the second switch to be closed; When it is detected that the voltage across the LCR oscillation unit reaches a first preset voltage, controlling both the first switch and the second switch to be disconnected; When receiving the first discharge instruction, controlling the fifth switch and the sixth switch to be closed; When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch and the sixth switch are controlled to be disconnected; When receiving a second charging instruction, controlling the first switch and the second switch to be opened, and controlling the third switch and the fourth switch to be closed; When it is detected that the voltage across the LCR oscillation unit reaches a second preset voltage, the third switch and the fourth switch are both controlled to be disconnected; When receiving the second discharge instruction, controlling the fifth switch and the sixth switch to be closed; When it is detected that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current, the fifth switch and the sixth switch are controlled to be disconnected.

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