Capacitive energy storage type pulse power supply

Abstract

The application provides a capacitor energy storage type pulse power supply, comprising: 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 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 a preset frequency, i=1, 2, 3…, n, and n is the number of LCR oscillation units. Each LCR oscillation unit outputs a rectangular wave current in parallel to supply power to a load. Based on Fourier theory, the application adopts a plurality of LCR oscillation units in parallel to generate a plurality of sine wave signals with different frequencies to superimpose a rectangular wave current, so that the rising edge and falling edge of the rectangular wave have high steepness, and the emission performance of the electromagnetic rail gun is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulse power supply, in particular to a capacitor energy storage type pulse power supply. BACKGROUND

[0002] The electromagnetic rail gun is a new concept kinetic energy weapon, which uses the electromagnetic force of pulse large current to directly accelerate macroscopic projectiles, and can accelerate the macroscopic projectiles to more than 2km / s, and has wide application prospects in homeland defense, anti-armor, super-long-range rapid attack and the like. In the launching process of the electromagnetic rail gun, in order to obtain a constant acceleration force, the electromagnetic rail gun needs a pulse power supply (PPS) to provide a flat-top rectangular wave current drive.

[0003] In the prior art, referring to Figure 1 , the pulse power supply in the electromagnetic rail gun adopts a pulse forming network (PFN) power supply, which is composed of multiple pulse forming units controlled by time sequence triggering to discharge to the load, and the multiple pulse currents controlled by time sequence triggering are synthesized into an approximately trapezoidal current waveform on the electromagnetic rail gun load, referring to Figure 2 Since the capacitor is connected in parallel with the freewheeling silicon stack, the current descending section is a slow decay process of the LR circuit, and the rising edge and the falling edge are not steep enough. The rising edge is too slow, the aluminum armature is not accumulated enough in the initial launching state, and the block-shaped peeling of the aluminum armature due to friction affects the subsequent launching; the falling edge is too slow, the current intensity is still high when the armature is fired, a large amount of electromagnetic energy is dissipated in the form of arc, the launching efficiency is low, and the arc radiation characteristic information is not conducive to the concealment of the weapon system. SUMMARY

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

[0005] In a first aspect, the embodiment of the present application provides a capacitor energy storage type pulse power supply, comprising: a direct current 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 with the first end of the fifth switch, the second end of the fifth switch forms a first output end of the capacitor energy storage type pulse power supply, and the second end of each LCR oscillation unit is connected with the first end of the sixth switch, the second end of the sixth switch forms a second output end of the capacitor energy storage type pulse power supply.

[0007] The positive pole of the direct current power supply is connected with the first end of the charging capacitor through the first switch, and the negative pole of the direct current power supply is connected with the second end of the charging capacitor through the second switch.

[0008] The positive pole of the direct current power supply is also connected with the second end of the charging capacitor through a third switch, and the negative pole of the direct current power supply is also connected with the first end of the charging capacitor through a fourth switch; wherein the charging capacitor is a capacitor in any one of the LCR oscillation units;

[0009] The controller is connected with 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 respectively;

[0010] The controller is used for controlling the first switch, the second switch, the third switch and the fourth switch to make the direct current power supply charge each LCR oscillation unit forwardly or reversely; the controller is also used for controlling the fifth switch and the sixth switch to make 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 for the load; the load is equivalent to a load inductance and a load resistance connected in series;

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

[0012] Optionally, the LCR oscillation unit comprises 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 one of the first capacitors.

[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 value of the first capacitor in the i-th LCR oscillation unit is:

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

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

[0020]

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

[0022] Optionally, the first inductor in each LCR oscillation unit has an inductance of 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 first inductor in each LCR oscillation unit has an inductance of 9 times the inductance of the load inductor.

[0025] Optionally, the line resistance of each LCR oscillation unit is not greater than 1 mΩ.

[0026] Optionally, the controller is specifically configured to:

[0027] When the first charging instruction is received, the third switch and the fourth switch are both controlled to be open, and the first switch and the second switch are both controlled to be closed;

[0028] When the voltage across the LCR oscillation unit is detected to reach the first preset voltage, the first switch and the second switch are both controlled to be open;

[0029] When the first discharging instruction is received, the fifth switch and the sixth switch are both controlled to be closed;

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

[0031] When the second charging instruction is received, the first switch and the second switch are both controlled to be open, and the third switch and the fourth switch are both controlled to be closed;

[0032] When the voltage across the LCR oscillation unit is detected to reach the second preset voltage, the third switch and the fourth switch are both controlled to be open;

[0033] When the second discharging instruction is received, the fifth switch and the sixth switch are both controlled to be closed;

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

[0035] The embodiment of the present application provides a capacitor energy storage type pulse power supply. The capacitor energy storage type pulse power supply comprises: a direct current 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 with 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 with 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 pole of the direct current power supply is connected with the first end of the charging capacitor through the first switch, and the negative pole of the direct current power supply is connected with the second end of the charging capacitor through the second switch; the positive pole of the direct current power supply is also connected with the second end of the charging capacitor through the third switch, and the negative pole of the direct current power supply is also connected with the first end of the charging capacitor through the fourth switch; wherein the charging capacitor is a capacitor in any one of the LCR oscillation units; the controller is connected with 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 for controlling the first switch, the second switch, the third switch and the fourth switch, so that the direct current power supply charges each LCR oscillation unit in a forward direction or in a reverse direction; the controller is also used for controlling 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 a rectangular wave current to supply power to a load; the load is equivalent to a load inductance and a load resistance connected in series; wherein the charging voltages of each LCR oscillation unit are the same, and the frequency of the i-th LCR oscillation unit is f i = f0*[1+2(i-1)]; f0 is a preset frequency, i = 1, 2, 3…, n, and n is the number of the LCR oscillation units. The embodiment of the present application is based on Fourier theory, adopts a plurality of LCR oscillation units in parallel, generates a plurality of different frequency near-sine wave currents to be combined into a rectangular wave current, and the controller controls the on-off of each switch, so that the capacitor energy storage type pulse power supply outputs a rectangular wave current. The rising edge of the rectangular wave current output by the capacitor energy storage type pulse power supply is higher in steepness, and the aluminum armature does not have block-shaped peeling during initial emission; meanwhile, the falling edge is also higher in steepness, and when the rectangular wave current drives the railgun, the current is zero at the moment when the projectile is fired, so that arc discharge is not formed, the emission efficiency and emission speed are improved, and the risk of being detected by the enemy is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

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

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

[0041] In order to enable those skilled in the art to better understand the present scheme, the technical solutions in the embodiments of the present scheme will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present scheme. Obviously, the described embodiments are only a part of the embodiments of the present scheme, rather than all the embodiments. Based on the embodiments in the present scheme, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present scheme.

[0042] The term “includes” and other any variations thereof in the specification and claims of the present scheme and the above-mentioned accompanying drawings means “including but not limited to”, which is intended to cover non-exclusive inclusion, and is not limited to only the examples listed in the text. In addition, the terms “first” and “second” and the like are used to distinguish different objects, rather than to describe a specific order.

[0043] The implementation of the present application will be described in detail below in conjunction with specific accompanying drawings:

[0044] Figure 3 is a structure schematic diagram of a capacitor energy storage type pulse power supply provided by an embodiment of the present application.

[0045] Referring to Figure 3 The capacitor energy storage type pulse power supply comprises a direct current 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, 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 pole of the direct current power supply S is connected with the first end of the charging capacitor through the first switch K1, and the negative pole of the direct current power supply S is connected with the second end of the charging capacitor through the second switch K2;

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

[0049] The controller is connected with 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 respectively;

[0050] The controller is used for controlling the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4, so that the direct current power supply S charges each LCR oscillation unit in a forward direction or in a reverse direction; the controller is also used for controlling 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 a rectangular wave current to supply power to a load; the load is equivalent to a load inductance Lg and a load resistance Rg connected in series;

[0051] Wherein, the charging voltage of each LCR oscillation unit is the same, and the frequency of the i-th LCR oscillation unit is: i f i = f 0 * [1 + 2 (i-1) ]; f 0 is a preset frequency, i = 1, 2, 3…, n, and n is the number of LCR oscillation 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 can all be normally open switches, that is, in the default state (when there is no control signal at the control end), the switches are in the open state.

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

[0054]

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

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

[0057] Based on the above theory, multiple LCR oscillation units are arranged in the embodiment of the application to generate multiple approximate sine wave currents with different frequencies, the frequencies of the LCR oscillation units are f0, 3f0, 5f0, 7f0, 9f0, and the like, respectively, and the multiple approximate sine wave currents with appropriate frequencies and appropriate amplitudes are connected in parallel to obtain an approximate rectangular wave. The controller controls the fifth switch K5 and the sixth switch K6 to control the capacitor energy storage type pulse power supply to supply power to the load, 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 LCR oscillation units in the positive direction or in the reverse direction, and to collect residual energy. Figure 4 The rising edge and the falling edge of the rectangular wave current are relatively steep, and the rectangular wave current is suitable for electromagnetic railgun launching. The aluminum armature does not have block peeling during initial launching, the steepness of the falling edge is also higher, and when the rectangular wave current drives the railgun, the current is zero at the moment when the projectile is fired, so that arc discharge is not formed, energy waste is avoided, launching efficiency and initial velocity are improved, and the risk of being detected by the enemy is reduced.

[0058] In a possible implementation, the LCR oscillation unit can 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] The charging capacitor can be any one of the first capacitors.

[0061] Reference Figure 3 Since the winding of the first inductor has resistance and the connection lines between the elements also have resistance, reference Figure 3 The line resistances of the LCR oscillation units can be equivalent to R11, R12, R13, R14, R15,... (where R11, R12, R13, R14, R15,... are not real resistances) respectively. Therefore, the series connection of the first capacitor, the first inductor and the line resistance in the embodiment of the application can effectively generate an approximate sine wave, the circuit structure is simple, and the circuit cost is low. The circuit structures of the LCR oscillation units are the same, which is beneficial to maintaining the consistency of the circuit.

[0062] The charging capacitor can be any one of the first capacitors. Reference Figure 3 The charging capacitor can be the first capacitor (C11) in the first LCR oscillation unit, and the direct current power supply S charges the LCR oscillation units through the first capacitor (C11) in the first LCR oscillation unit.

[0063] Reference Figure 3 , exemplary, the charging capacitor is the first capacitor (C11) in the first LCR oscillation unit, 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, and the specific connection relationship is shown in Figure 3 , which will not be repeated here.

[0064] In a possible implementation, the controller can be specifically used for:

[0065] S101: When receiving a first charging instruction, control the third switch K3 and the fourth switch K4 to be both open, and control the first switch K1 and the second switch K2 to be both closed;

[0066] Based on Figure 3 the connection relationship, when receiving a first charging instruction (the first charging instruction is used to indicate that each LCR oscillation unit is charged in the positive direction), control the third switch K3 and the fourth switch K4 to be both open, and control the first switch K1 and the second switch K2 to be both closed, and the DC power supply S charges each LCR oscillation unit in the positive direction;

[0067] S102: When detecting that the voltage across the LCR oscillation unit reaches a first preset voltage, control the first switch K1 and the second switch K2 to be both open, and complete a charging;

[0068] When detecting that the voltage across the LCR oscillation unit reaches a first preset voltage (a positive voltage), the first switch K1 and the second switch K2 are opened, a charging is completed, and discharging (standby) is waited.

[0069] S103: When receiving a first discharging instruction, control the fifth switch K5 and the sixth switch K6 to be both closed;

[0070] When discharging is needed to the load, that is, when receiving a first discharging instruction, 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 rapidly rises, drives the armature of the electromagnetic rail gun to make accelerated motion, and the rail gun starts to launch.

[0071] S104: When detecting that the absolute value of the output current of the capacitor energy storage type pulse power supply is less than a preset current, control the fifth switch K5 and the sixth switch K6 to be both open, and complete a discharging;

[0072] When the rectangular wave current reaches the falling edge, the electromagnetic railgun armature just moves to the muzzle position, at this time, if the absolute value of the output current of the capacitor energy storage type pulse power supply is less than the preset current (i.e. falls to 0), the primary discharge is completed, the fifth switch K5 and the sixth switch K6 are turned off, the discharge to the load is stopped, and the primary emission task is completed. The specific waveform is shown in Fig. 2. Figure 4 .

[0073] S105: When the second charging instruction is received, the first switch K1 and the second switch K2 are both turned off, and the third switch K3 and the fourth switch K4 are both closed.

[0074] After the first emission task 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 emission. When the second charging instruction (the second charging instruction is used to indicate reverse charging for each LCR oscillation unit) is received, the first switch K1 and the second switch K2 are both turned off, and the third switch K3 and the fourth switch K4 are both closed, and the DC power supply S is used to charge each LCR oscillation unit reversely.

[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 turned off, and the secondary charging is completed.

[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 turned off, the secondary charging is completed, and the discharge is waited (in standby mode).

[0077] S107: When the second discharge instruction is received, the fifth switch K5 and the sixth switch K6 are both closed.

[0078] When the discharge to the load is needed, i.e. 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 both turned off, and the secondary discharge is completed.

[0080] Similarly, 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 secondary discharge is completed, and the secondary emission task is completed. The specific waveform is shown in Fig. 4. Figure 4 .

[0081] Since the residual energy is stored in each first capacitor in a forward energy storage mode after the second launch task is completed (at this time, the voltage of the charging capacitor C11 is positive), each LCR oscillation unit is forward charged when the third launch task is needed, and the steps of S101-S108 are repeated to complete multiple launch tasks. The capacitor energy storage type pulse power supply can realize the output of positive and negative rectangular wave current without setting a freewheeling silicon stack, and is used for driving the electromagnetic rail gun, has good driving effect, and makes the safety and stability of the electromagnetic rail gun better and efficient.

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

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

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

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

[0087] In the embodiment of the application, 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 1 mΩ, and the capacitance of the first capacitor affects the frequency of each approximate sine wave.

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

[0089] The line resistance of each LCR oscillation unit is small, and the calculation formula of the LC oscillation period is Assuming that the capacitance of the first capacitor (C11) in the first LCR oscillation unit is C0, the capacitance of each first capacitor can be obtained as follows:

[0090] That is,

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

[0092]

[0093] 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.

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

[0095] Therefore, it can be deduced that:

[0096]

[0097] In the embodiment of the application, 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, so that rectangular wave currents of different widths can be output to meet different acceleration requirements of the electromagnetic railgun.

[0098] For example, for a 12.5m long electromagnetic railgun with a muzzle velocity of 2.5km / s and an acceleration time of 10ms, a group of first capacitors is used; for a 1.25m long electromagnetic railgun with a muzzle velocity of 2.5km / s and an acceleration time of 1ms, another group of first capacitors is used.

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

[0100] In one possible implementation, the inductance of the first inductor in each LCR oscillation unit is not less than 5 times the inductance of the load inductance 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 application, the resistance of the line resistance of each LCR oscillation unit is small, and is not greater than 5 times the resistance of the load resistance Rg, which can effectively ensure the steepness of the rising edge and the falling edge of the rectangular wave.

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

[0104] In one possible implementation, the line resistance of each LCR oscillation unit is not greater than 1mΩ.

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

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

[0107] For example, for a 12.5 m long electromagnetic railgun, the muzzle velocity is 2.5 km / s, the acceleration time is 10 ms, i.e., the pulse width of the rectangular wave current output by the capacitor energy storage type pulse power supply is 10 ms, the period of the first LCR oscillation unit is 20 ms (50 Hz), and thus C0= 253.3 mF (50 Hz) is calculated, and the capacitance values of the first capacitors in the other LCR oscillation units are 28.144 mF (150 Hz), 10.132 mF (250 Hz), 5.169 mF (350 Hz), and 3.127 mF (450 Hz), respectively.

[0108] The ratio of each first capacitor is: The energy storage ratio is: The peak current ratio is: The coefficient ratio in the Fourier expansion is exactly met, and the specific parameters are shown in Table 1.

[0109] Table 1: First circuit parameter table

[0110]

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

[0112] For example, for a 1.25 m long electromagnetic railgun, the muzzle velocity is 2.5 km / s, the acceleration time is 1 ms, i.e., the pulse width of the rectangular wave current is 1 ms, the period of the first LCR oscillation unit is 2 ms (0.5 kHz), and thus C0= 25.33 mF (0.5 kHz) is calculated, and the capacitance values of the first capacitors in the other LCR oscillation units are 2.8144 mF (1.5 kHz), 1.0132 mF (2.5 kHz), 0.5169 mF (3.5 kHz), and 0.3127 mF (4.5 kHz), respectively, and the specific parameters are shown in Table 2.

[0113] Table 2: Second circuit parameter table

[0114]

[0115] Based on the above, by setting different values of the first capacitance, a rectangular wave current with different pulse widths and high steepness can be output, and a better driving effect can be obtained to meet different military requirements.

[0116] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pulsed power supply of the capacitive energy storage type, characterized in that, The application relates to a capacitor energy storage type pulse power supply. The capacitor energy storage type pulse power supply comprises a direct current 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 with 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 with 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 pole of the direct current power supply is connected with the first end of a charging capacitor through the first switch, and the negative pole of the direct current power supply is connected with the second end of the charging capacitor through the second switch. The positive pole of the direct current power supply is also connected with the second end of the charging capacitor through the third switch, and the negative pole of the direct current power supply is also connected with the first end of the charging capacitor through the fourth switch. The controller is connected with the control ends of the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch. The controller controls the first switch, the second switch, the third switch and the fourth switch to make the direct current power supply charge each LCR oscillation unit in a forward direction or in a reverse direction. Wherein, the charging voltage of each LCR oscillation unit is same, and the frequency of the i th LCR oscillation unit is: i =f0*[1+2(i-1)]; f0 is a preset frequency, i=1, 2, 3…, n, n is the number of the LCR oscillation units.

2. The capacitor energy storage type pulsed power supply as claimed in claim 1, wherein, The LCR oscillation unit comprises 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. The charging voltage of the first capacitor in each LCR oscillation unit is the same.

3. The capacitor energy storage pulsed power supply of claim 2, wherein, The preset capacitor value C0 is calculated by the following formula: The inductance of the first inductor in each LCR oscillation unit is not less than 5 times the inductance of the load inductor. The capacitance of the first capacitor in the i-th LCR oscillation unit is: The line resistance of each LCR oscillation unit is not greater than 5 times the resistance of the load resistor.

4. The capacitor energy storage pulsed power supply of claim 3, wherein, The inductance of the first inductor in each LCR oscillation unit is 9 times the inductance of the load inductor. Wherein, T is the pulse width of the rectangular wave current output by the electric capacity energy storage type pulse power supply, L r is the loop inductance.

5. The capacitor energy storage pulsed power supply of claim 3, wherein, The line resistance of each LCR oscillation unit is not greater than 1 m omega. The controller is specifically used for:

6. The capacitor energy storage pulsed power supply of claim 5, wherein, when receiving a first charging instruction, controlling the third switch and the fourth switch to be both disconnected and controlling the first switch and the second switch to be both closed; 7. The capacitor energy storage pulsed power supply of claim 3, wherein, when detecting that the voltage between the two ends of the LCR oscillation unit reaches a first preset voltage, controlling the first switch and the second switch to be both disconnected; 8. The capacitor energy storage pulsed power supply of any of claims 1 to 7, wherein, when receiving a first discharging instruction, controlling the fifth switch and the sixth switch to be both 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 a preset current, the fifth switch and the sixth switch are both controlled to be open; When a second charging instruction is received, the first switch and the second switch are both controlled to be open, and the third switch and the fourth switch are both controlled 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 open; When a second discharging instruction is received, the fifth switch and the sixth switch are both controlled 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 both controlled to be open.

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