A kind of energy recovery multiplexing device based on parallel resonance principle magnetic resistance transmitting coil

Abstract

The embodiment of the application provides a kind of energy recovery multiplexing device based on parallel resonance principle magnetic resistance transmitting coil, it is related to energy recovery technical field, the device includes: magnetic resistance transmitting module, including at least one level transmitting coil and corresponding first switch tube;Energy recovery module, including resonant capacitor, second switch tube and unidirectional conducting device, transmitting coil, resonant capacitor and unidirectional conducting device constitute first stage parallel resonance circuit, the second switch tube is connected in series between resonant capacitor and transmitting coil;Energy conversion and recharge module, including transformer and rectifier circuit, the resonant capacitor and the primary side winding of transformer constitute second stage parallel resonance circuit, the secondary side winding of the transformer is connected to DC power supply by rectifier circuit;Timing control module is used to control the conduction timing of first switch tube and second switch tube according to projectile position detection signal.The application can improve the projectile launch speed.

Description

Technical Field

[0001] This application relates to the field of energy recovery technology, specifically to an energy recovery and reuse device based on a parallel resonance principle magnetoresistive transmitting coil. Background Technology

[0002] Magnetoresistive electromagnetic launchers rely on the electromagnetic attraction generated by an energized launch coil to drive the projectile. They offer advantages such as simple structure, convenient control, and no launch flash, making them suitable for applications like dynamic material testing and drone defense. However, in conventional magnetoresistive launch processes, the launch coil is an inductive load, meaning the current cannot change abruptly. After launch, a significant amount of electromagnetic energy remains in the coil. Traditionally, this residual energy is dissipated as heat through a freewheeling resistor, resulting in significant energy waste and overheating of the coil and surrounding components, reducing their lifespan and the launcher's operational stability. Furthermore, if the stored electromagnetic energy in the coil is not released promptly, the freewheeling current cannot quickly drop to zero. When the projectile exits the coil, it experiences a reverse electromagnetic pull, causing deceleration and severely impacting launch efficiency.

[0003] Existing technology, based on the traditional magnetoresistive transmitting circuit, connects the driving coil and the capacitor to form a capacitor absorption circuit. When the transmitting phase ends and the driving coil is turned off, the remaining electromagnetic energy in the coil is absorbed by the capacitor, realizing the rapid decay of the coil current, thereby reducing the armature drag force and increasing the transmitting speed.

[0004] However, the aforementioned existing technology uses capacitors to extract the inductance energy from the coil. This portion of electrical energy can only be stored in the capacitor in the form of electric field energy for a long time, or gradually consumed through the discharge resistor, resulting in energy waste. Summary of the Invention

[0005] In view of this, this application provides an energy recovery and reuse device for a magnetoresistive launching coil based on the parallel resonance principle, in order to solve the problem in the prior art that a large amount of electromagnetic energy remains in the coil after the projectile is launched, and is dissipated as heat only through the freewheeling resistor, resulting in energy waste and low launching efficiency.

[0006] In a first aspect, embodiments of this application provide an energy recovery and reuse device based on a parallel resonance principle magnetoresistive transmitting coil, comprising: A magnetoresistive transmitting module includes at least one transmitting coil and a corresponding first switching transistor; The energy recovery module includes a resonant capacitor, a second switching transistor, and a unidirectional conducting device. The transmitting coil, the resonant capacitor, and the unidirectional conducting device form a first-stage parallel resonant circuit, and the second switching transistor is connected in series between the resonant capacitor and the transmitting coil. The energy conversion and recharge module includes a transformer and a rectifier circuit. The resonant capacitor and the primary winding of the transformer form a second-stage parallel resonant circuit. The secondary winding of the transformer is connected to a DC power supply via the rectifier circuit. The timing control module is used to control the conduction timing of the first and second switching transistors based on the projectile position detection signal.

[0007] In one possible implementation, the resonant frequency of the first-stage parallel resonant circuit is jointly determined by the inductance of the transmitting coil and the capacitance of the resonant capacitor, and the parameter matching relationship between the inductance and capacitance values ​​satisfies: The initial current of the launching coil when the first switch is turned off decays to zero after 1 / 4 of the resonant period of the first-stage parallel resonant circuit, and the 1 / 4 resonant period is less than or equal to the time taken from when the projectile completely enters the launching coil to when it leaves the launching coil.

[0008] In one possible implementation, the timing control module includes: The projectile position detection unit is used to detect whether the projectile has reached the firing end of the firing coil and whether it has completely entered the firing coil; A switch driving unit is used to control the first switch to close when the projectile is detected to have reached the launching end; and to control the first switch to open and the second switch to close when the projectile is detected to have completely entered the launching coil. The switching delay protection unit is used to set the dead time between the opening of the first switch and the closing of the second switch.

[0009] In one possible implementation, in the energy conversion and recharge module, the second-stage parallel resonant circuit is activated after the second switch is turned off and all emitter stages stop working. The voltage accumulated in the resonant capacitor is stepped up by a transformer and then converted into DC by a rectifier circuit.

[0010] In one possible implementation, the magnetoresistive transmitting module includes a multi-stage transmitting coil, each stage of which is respectively equipped with a first switching transistor, a second switching transistor, and a unidirectional conducting device, and shares the same resonant capacitor and the same energy conversion and recharge module; The timing control module uses a time-division multiplexing method to sequentially transfer the inductive energy stored in each stage of the transmitting coil to the resonant capacitor.

[0011] In one possible implementation, the timing control module uses a time-division multiplexing method to sequentially transfer the inductive energy stored in each stage of the transmitting coil to the resonant capacitor, including: At any given moment, the timing control module controls only the second switch corresponding to the first-stage transmitting coil to close, while the second switches corresponding to the other transmitting coils remain open, so that at any given moment, only the first-stage transmitting coil and the resonant capacitor form the first-stage parallel resonant circuit. The energy transfer of each stage of the transmitting coil is performed sequentially according to the order in which the projectile arrives at each stage of the coil, until the inductive energy stored in all transmitting coils has been transferred to the resonant capacitor. Only then does the timing control module start the energy conversion and recharge module.

[0012] In one possible implementation, the timing control module is configured to execute an energy topology dynamic reconfiguration control strategy: The terminal voltage of the resonant capacitor and the output voltage of the DC power supply are obtained in real time, and the dynamic voltage drop ratio is calculated. The timing control module dynamically switches the operating timing of the first-stage parallel resonant circuit and the second-stage parallel resonant circuit according to the numerical range of the dynamic differential pressure ratio. When the dynamic differential pressure ratio is within the first preset range, the timing control module does not engage the primary winding of the transformer, allowing the first-stage parallel resonant circuit to oscillate freely to complete energy extraction. When the dynamic differential pressure ratio rises to the second preset range, the timing control module switches the primary winding of the transformer into the resonant circuit and starts the second-stage parallel resonant circuit.

[0013] In one possible implementation, the rectifier circuit is a single-phase bridge rectifier circuit, with a spike absorption resistor connected in series between its output terminal and the DC power supply to limit the peak value of the recharge current. The turns ratio of the transformer is set according to the ratio of the expected maximum voltage of the resonant capacitor to the rated voltage of the DC power supply.

[0014] In one possible implementation, the turns ratio of the transformer is set based on the ratio of the expected maximum voltage of the resonant capacitor to the rated voltage of the DC power supply: in, This is the rated voltage of the DC power supply; This is the forward voltage drop of the diode in the rectifier circuit; This is the expected highest voltage of the resonant capacitor; This is the combined efficiency coefficient of the transformer and rectifier circuit. This refers to the turns ratio of the transformer. This is the maximum permissible charging current of the DC power supply. For safety factor; This is the equivalent load resistance referred to the primary side of the transformer.

[0015] In one possible implementation, the timing control module further includes an energy state monitoring unit for real-time detection of the terminal voltage of the resonant capacitor; When the terminal voltage reaches the first preset threshold, the timing control module starts the energy conversion and recharge module; When the terminal voltage is lower than the second preset threshold, the timing control module prohibits the start of the energy conversion and recharge module.

[0016] This application utilizes a rapid coil energy recovery device to eliminate the reverse electromagnetic attraction experienced by the projectile when it exits the firing coil, thereby increasing the projectile's firing speed. This application achieves efficient recovery of residual electromagnetic energy through an LC parallel resonant circuit, directly recharging the battery to realize energy recycling and further enhance the system's energy-saving effect, meeting the requirements of green and energy-saving development.

[0017] This application can quickly release the remaining energy of the transmitting coil, effectively avoiding coil overheating and insulation aging, and extending the service life of the transmitting coil and system components. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a circuit topology diagram of the energy recovery device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the DC magnetoresistive emission principle provided in the embodiments of this application; Figure 3 A schematic diagram of the projectile magnetization principle provided in the embodiments of this application; Figure 4 A schematic diagram of the magnetizing current and magnetic field vector at the entrance of the transmitting coil provided in this application embodiment; Figure 5 The capacitor voltage variation curve provided in the embodiments of this application; Figure 6 The transformer primary voltage variation curve provided in the embodiments of this application; Figure 7 The transformer secondary voltage variation curve provided in the embodiments of this application; Figure 8 The battery charging current variation curve provided in the embodiments of this application.

[0020] The attached figures are labeled as follows: Battery - DC power supply; C - resonant capacitor; D1, D2, D3 - diodes; IGBT1_1, IGBT2_1, IGBT3_1 - first switching transistors; IGBT1_2, IGBT2_2, IGBT3_2 - second switching transistors; IGBT4 - third switching transistor; L1 - first-stage transmitting coil; L2 - second-stage transmitting coil; L3 - third-stage transmitting coil; R - spike absorption resistor; T - transformer. Detailed Implementation

[0021] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0023] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a," "say," and "this" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0024] It should be understood that the terms used in this document are merely descriptive of the relationships between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] like Figure 1 As shown in the figure, this application provides an energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil, including a magnetoresistive transmitting module, an energy recovery module, an energy conversion and recharging module, and a timing control module.

[0026] A magnetoresistive transmitter module includes at least one transmitting coil and a corresponding first switching transistor.

[0027] This embodiment takes a three-stage magnetoresistive DC transmitter as an example. The magnetoresistive transmitter module includes a first-stage transmitter coil L1, a second-stage transmitter coil L2, a third-stage transmitter coil L3, and first switching transistors IGBT1_1, IGBT2_1, and IGBT3_1 corresponding to the three transmitter coils, respectively.

[0028] One end of each transmitting coil is connected to the negative terminal of the DC power supply, and the other end is connected to the positive terminal of the DC power supply through the corresponding first switching transistor.

[0029] The energy recovery module includes a resonant capacitor C, a second switching transistor (IGBT1_2, IGBT2_2, IGBT3_2), and a unidirectional conducting device. In this embodiment, the unidirectional conducting device is a diode.

[0030] The transmitting coil, resonant capacitor, and unidirectional conducting device constitute the first-stage parallel resonant circuit. Specifically, the first-stage transmitting coil L1, resonant capacitor C, and diode D1 constitute the first-stage parallel resonant circuit; the second-stage transmitting coil L2, resonant capacitor C, and diode D2 constitute the first-stage parallel resonant circuit; and the third-stage transmitting coil L3, resonant capacitor C, and diode D3 constitute the first-stage parallel resonant circuit.

[0031] The second switching transistor is connected in series between the resonant capacitor C and each stage of the transmitting coil. Specifically, the second switching transistor IGBT1_2 is connected in series between the resonant capacitor C and the first stage transmitting coil L1, the second switching transistor IGBT2_2 is connected in series between the resonant capacitor C and the second stage transmitting coil L2, and the second switching transistor IGBT3_2 is connected in series between the resonant capacitor C and the third stage transmitting coil L3.

[0032] The energy conversion and recharge module includes a transformer T and a rectifier circuit. The resonant capacitor C is connected in parallel with the primary winding of the transformer T to form a second-stage parallel resonant circuit. The secondary winding of the transformer T is connected to a DC power supply via the rectifier circuit. A third switching transistor IGBT4 is also connected in series on the primary winding of the transformer T to control the start-up of the second-stage resonant circuit.

[0033] The rectifier circuit uses a single-phase bridge rectifier circuit, with a spike absorption resistor R connected in series at its positive output terminal before being connected to the positive terminal of the DC power supply. The resistance value of the spike absorption resistor R must be much larger than the equivalent internal resistance of the rectifier bridge to ensure that the current limiting effect is mainly determined by the spike absorption resistor R. The function of the spike absorption resistor R is as follows: During the commutation process of the rectifier circuit (i.e., the instant when the AC current crosses zero and the diode conduction pair switches), high-frequency spike voltages will be generated at the output terminal due to the parasitic oscillations of the leakage inductance of the transformer T and the junction capacitance of the diode. The spike absorption resistor R, together with parasitic parameters such as the distributed capacitance and battery internal resistance in the circuit, forms a damping network, which can effectively absorb and suppress such spikes, further protecting the DC power supply.

[0034] In this embodiment, the value of the peak absorption resistor R is 10KΩ. In other embodiments, the value of the peak absorption resistor R can be set according to user requirements.

[0035] In this embodiment, the turns ratio of the transformer is set according to the ratio of the expected maximum voltage of the resonant capacitor to the rated voltage of the DC power supply: in, This is the rated voltage of the DC power supply; This is the forward voltage drop of the diode in the rectifier circuit; This is the expected highest voltage of the resonant capacitor; The combined efficiency coefficient of the transformer and rectifier circuit is, in this embodiment, the combined efficiency coefficient of the transformer and rectifier circuit. The value is 0.85; The turns ratio of transformer T; This is the maximum permissible charging current of the DC power supply. For safety factors, in this embodiment, the safety factor is... The value is 0.9; This is the equivalent load resistance referred to the primary side of the transformer.

[0036] In this embodiment, provided that the turns ratio n is met, the charging current amplitude and charging time can be adjusted by adjusting the transformer's turns ratio.

[0037] The timing control module is used to control the conduction timing of the first and second switching transistors based on the projectile position detection signal. The timing control module includes sub-modules such as a projectile position detection unit, a switch drive unit, a switching delay protection unit, and an energy status monitoring unit to achieve precise timing control.

[0038] The projectile position detection unit includes a sensor (such as a photoelectric sensor or a magnetic sensor) for detecting the projectile's position, and is disposed at the transmitting end of each stage of the transmitting coil. The switch driving unit is communicatively connected to the projectile position detection unit and is used to control the first switch to close when the projectile is detected to have reached the transmitting end; and to control the first switch to open and the second switch to close when the projectile has completely entered the transmitting coil. The switching delay protection unit is communicatively connected to the switch driving unit and is used to set a dead time between the opening of the first switch and the closing of the second switch.

[0039] The energy state monitoring unit is used to detect the terminal voltage of the resonant capacitor C in real time. When the terminal voltage reaches a first preset threshold (e.g., 50V), the timing control module allows the switching to the energy conversion and recharge module; when the terminal voltage is lower than a second preset threshold (e.g., 20V), the timing control module prohibits the switching to the energy conversion and recharge module.

[0040] like Figure 2 As shown, this embodiment takes the first-stage transmission process as an example to illustrate the transmission principle of a DC magnetoresistive transmitter.

[0041] When the sensor detects that the projectile has reached the firing end of the firing coil, the first switching transistor IGBT1_1 closes, and the first-stage firing coil L1 is energized and generates magnetic induction intensity. B Simultaneously, under the influence of the magnetic field, the magnetically conductive projectile exhibits a magnetizing current. J ,like Figure 3 As shown.

[0042] When the projectile is located at the launching end of the first-stage launching coil L1, such as Figure 4 As shown, the magnetic field of the first-stage transmitting coil L1 is perpendicular to the magnetizing current, and the interaction between the magnetic field and the current generates an electromagnetic force: Where F is the electromagnetic force; B is the magnetic field of the first-stage transmitting coil L1; This refers to the current within the first-stage transmitting coil L1.

[0043] Under the influence of electromagnetic force, the projectile is accelerated and launched. To prevent the projectile from being decelerated by a reverse electromagnetic force when it exits the coil, the first switching transistor IGBT1_1 is turned off after the sensor detects that the projectile has fully entered the first-stage launching coil L1, causing the coil current to rapidly drop to zero before the projectile is launched. Since the launching coil is an inductive load, the current will not change abruptly when the power supply to the coil launching circuit is suddenly cut off. At this time, the energy stored in the coil inductance is: in, Store energy for the coil inductance; The coil current is the instant the first switching transistor IGBT1_1 is turned off. The inductance is for the first-stage transmitting coil L1.

[0044] If the coil energy is not recovered in time, the energy stored in the coil inductance will be dissipated as Joule heat through the coil's DC resistance, causing the coil to overheat or even be damaged. Therefore, at the same time as the first switching transistor IGBT1_1 is turned off, the energy recovery device begins to rapidly recover the energy stored in the coil inductance, causing the coil current to drop rapidly to 0. At the same time, the inductance stored in the coil is recovered to the DC power supply, effectively preventing the projectile from being decelerated by reverse pulling force while improving energy utilization.

[0045] This embodiment uses Figure 1 Taking the first-stage transmitting coil L1 as an example, this paper illustrates the energy recovery and recharging process of a single-stage transmitting coil. Combined with... Figures 5 to 8 A schematic diagram of the simulation results shows the energy transfer process as follows: In Figure 7 In the transformer, the secondary side exhibits positive and negative pulse voltage waveforms, the amplitude of which is clamped by the voltage across the battery terminals; Figure 8 In the process, as the energy on the primary side of the transformer is gradually transferred to the secondary side, the energy continuously decays, causing the battery charging current to continuously decay. When the voltage on the primary side of the transformer decays to 0, the charging current also decays to 0.

[0046] In this embodiment, Figure 8 The charging current waveform shown is a schematic curve of recharge after a single energy transfer. After multi-stage energy accumulation, the terminal voltage of the resonant capacitor C increases, and the initial amplitude of the recharge current increases accordingly, but the current decay trend is similar to... Figure 8 Consistent.

[0047] Initially, all switches are in the off state. When the sensor detects that the projectile has reached the firing end of the first-stage firing coil L1, the switch drive unit of the timing control module controls the first switch IGBT1_1 to close, and the DC power supply supplies power to the first-stage firing coil L1. The first-stage firing coil L1 generates an electromagnetic attraction to drive the projectile to accelerate. During this firing phase, the second switch IGBT1_2 of the energy recovery module remains off, and the resonant capacitor C does not participate in the operation.

[0048] When the sensor detects that the projectile has completely entered the first-stage transmitting coil L1, the timing control module controls the first switching transistor IGBT1_1 to turn off, and after a dead time set by the switching delay protection unit (1μs to 5μs in this embodiment, to avoid short circuit caused by simultaneous conduction of the first and second switching transistors), controls the second switching transistor IGBT1_2 to close. At this time, the first-stage transmitting coil L1, the resonant capacitor C, and the diode D1 constitute the first-stage parallel resonant circuit.

[0049] The formula for calculating the parallel resonant frequency is as follows: in, It is the parallel resonant frequency; Pi; The inductance of the first-stage transmitting coil L1; Let C be the capacitance of the resonant capacitor.

[0050] Since the first-stage transmitting coil L1 is an inductive load, its current reaches its maximum value the instant the first switching transistor IGBT1_1 is turned off. This current charges the resonant capacitor C through the first-stage parallel resonant circuit. During resonance, the inductive energy stored in the first-stage transmitting coil L1 is gradually transferred to the electric field energy stored in the resonant capacitor C. When the resonance reaches 1 / 4 of the oscillation cycle, the current in the first-stage transmitting coil L1 naturally crosses zero, and diode D1 is reverse-biased, preventing the resonant capacitor C from discharging in the reverse direction to the first-stage transmitting coil L1, thus locking the energy in the resonant capacitor C. At this time, the current in the first-stage transmitting coil L1 drops to zero, and the projectile will not be subjected to reverse electromagnetic pull when exiting the beam.

[0051] The formula for calculating the oscillation period is as follows: in, The oscillation period; Pi; It is the parallel resonant frequency; The inductance of the first-stage transmitting coil L1; Let C be the capacitance of the resonant capacitor.

[0052] In order to complete energy transfer before the projectile exits the firing coil, this embodiment sets 1 / 4 of the oscillation period to be less than or equal to the time elapsed from when the projectile fully enters the first-stage firing coil L1 to when it exits the first-stage firing coil L1, that is: in, The oscillation period; This refers to the time it takes for the projectile to completely enter the firing coil and exit it.

[0053] Right now, in, Pi; The inductance of the first-stage transmitting coil L1; Let C be the capacitance of the resonant capacitor.

[0054] For example, if the projectile is fired within 1 ms after fully entering the first-stage firing coil L1, then the resonant capacitor C needs to be selected based on the known inductance of the first-stage firing coil L1 such that: In this embodiment, the time elapsed from when the projectile fully enters the launching coil to when it exits the launching coil is obtained by measurement or simulation. The typical value is then used to determine the capacitance of the resonant capacitor C through formula calculation or experimental tuning. The value of .

[0055] If the inductance of the first-stage transmitting coil L1 is... , ,but Selectable Thin-film capacitors.

[0056] The inductive energy stored in the first-stage transmitting coil L1 is completely transferred to the resonant capacitor C. The formula for calculating the energy transfer is as follows: in, The coil current is the instant the first switching transistor IGBT1_1 is turned off. This is the terminal voltage of capacitor C after all energy has been transferred; The inductance of the first-stage transmitting coil L1; Let C be the capacitance of the resonant capacitor.

[0057] After completing the first stage of launch and energy recovery, the timing control module controls the second switch IGBT1_2 to turn off, waiting for the projectile to reach the launch terminal of the second-stage launch coil L2. The completion of the first stage of launch and energy recovery means that, with the second switch IGBT1_2 closed, the inductive energy stored in the first-stage launch coil L1 is completely transferred to the resonant capacitor C.

[0058] When the projectile reaches the launching end of the second-stage launching coil L2, the first switching transistor IGBT2_1 closes, and the second-stage launching coil L2 is energized to accelerate the projectile.

[0059] After the projectile fully enters the second-stage transmitting coil L2, the first switch IGBT2_1 is turned off and the second switch IGBT2_2 is turned on. The second-stage transmitting coil L2, the resonant capacitor C (which already stores the energy recovered from the first stage), and the diode D2 form the first-stage parallel resonant circuit, transferring the inductive energy stored in the second-stage transmitting coil L2 to the resonant capacitor C. At this time, the voltage on the resonant capacitor C will further increase.

[0060] Similarly, after the third stage of transmission is completed, the timing control module controls the second switch IGBT3_2 to close, transferring the energy in the third stage transmission coil L3 to the resonant capacitor C.

[0061] In the above process, the timing control module uses time-division multiplexing logic to sequentially transfer the inductive energy stored in each stage of the transmitting coil to the resonant capacitor. Specifically, at any given moment, the timing control module only controls the second switch corresponding to the first-stage transmitting coil (such as IGBT1_2) to close, while the second switches of the other stages (IGBT2_2, IGBT3_2) remain open, ensuring that at any given moment, only one stage of the transmitting coil and the resonant capacitor C form a resonant circuit. The energy transfer of each stage of the transmitting coil is performed sequentially according to the order in which the projectile arrives at each stage of the transmitting coil.

[0062] After all three stages of transmission are completed and all second switches have been turned off, the timing control module controls the third switch IGBT4 to close, thereby starting the energy conversion and recharge module to boost, rectify, and recharge all the energy stored in the resonant capacitor C.

[0063] In practical applications, the terminal voltage of the resonant capacitor C gradually increases with each stage of energy injection. In this embodiment, to optimize energy transfer efficiency, the timing control module is configured to execute a dynamic energy topology reconfiguration control strategy.

[0064] The timing control module acquires the terminal voltage of the resonant capacitor C in real time through a voltage sensor. With the output voltage of the DC power supply And calculate the dynamic pressure difference ratio: in, This refers to the dynamic differential pressure ratio. The voltage across the resonant capacitor C is denoted as . This is the output voltage of the DC power supply.

[0065] When the timing control module detects the dynamic differential pressure ratio When the voltage is within the first preset range (e.g., 0 < λ ≤ 0.8), the voltage across the resonant capacitor C is low, and the voltage difference with the battery is small. In this case, if the transformer T is connected too early, the excitation current on the primary side of the transformer may be too large, increasing losses. Therefore, the timing control module keeps the third switch IGBT4 off, that is, it does not connect to the primary winding of the transformer T, allowing the first-stage parallel resonant circuit to oscillate freely to complete energy extraction.

[0066] When the timing control module detects the dynamic differential pressure ratio When the voltage rises to the second preset range (e.g., λ>0.8), it indicates that the resonant capacitor C has stored a significant amount of energy and is ready for boost recharge. At this point, the timing control module first disconnects the corresponding second switch and then closes the third switch IGBT4. The resonant capacitor C and the primary side of the transformer T form the second-stage parallel resonant circuit. The second-stage parallel resonant circuit generates an exponentially decaying sinusoidal alternating current that flows through the primary side of the transformer T. The alternating current output from the secondary side of the transformer T is rectified by a single-phase bridge rectifier circuit and converted into direct current to recharge the DC power supply, thus achieving energy recycling.

[0067] By adopting the above scheme, this embodiment can prioritize the energy extraction speed in the low-voltage stage and promptly start energy conversion in the high-voltage stage, effectively avoiding the inefficient excitation of the transformer under low-voltage and high-current conditions and improving the overall energy recovery efficiency.

[0068] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A device for energy recovery and reuse of a magnetoresistive transmitting coil based on the principle of parallel resonance, characterized in that, include: A magnetoresistive transmitting module includes at least one transmitting coil and a corresponding first switching transistor; The energy recovery module includes a resonant capacitor, a second switching transistor, and a unidirectional conducting device. The transmitting coil, the resonant capacitor, and the unidirectional conducting device form a first-stage parallel resonant circuit, and the second switching transistor is connected in series between the resonant capacitor and the transmitting coil. The energy conversion and recharge module includes a transformer and a rectifier circuit. The resonant capacitor and the primary winding of the transformer form a second-stage parallel resonant circuit. The secondary winding of the transformer is connected to a DC power supply via the rectifier circuit. The timing control module is used to control the conduction timing of the first and second switching transistors based on the projectile position detection signal.

2. The energy recovery and reuse device based on parallel resonance principle magnetoresistive transmitting coil according to claim 1, characterized in that, The resonant frequency of the first-stage parallel resonant circuit is determined by the inductance of the transmitting coil and the capacitance of the resonant capacitor, and the parameter matching relationship between the inductance and capacitance values ​​satisfies: The initial current of the launching coil when the first switch is turned off decays to zero after 1 / 4 of the resonant period of the first-stage parallel resonant circuit, and the 1 / 4 resonant period is less than or equal to the time taken for the projectile to completely enter the launching coil and exit the launching coil.

3. The energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil according to claim 1, characterized in that, The timing control module includes: The projectile position detection unit is used to detect whether the projectile has reached the firing end of the firing coil and whether it has completely entered the firing coil; A switch driving unit is used to control the first switch to close when the projectile is detected to have reached the launching end; and to control the first switch to open and the second switch to close when the projectile is detected to have completely entered the launching coil. The switching delay protection unit is used to set the dead time between the opening of the first switch and the closing of the second switch.

4. The energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil according to claim 1, characterized in that, In the energy conversion and recharge module, the second-stage parallel resonant circuit starts after the second switch is turned off and all emitter stages stop working. The voltage accumulated in the resonant capacitor is stepped up by the transformer and then converted into DC by the rectifier circuit.

5. The energy recovery and reuse device based on parallel resonance principle magnetoresistive transmitting coil according to claim 1, characterized in that, The magnetoresistive transmitting module includes multiple stages of transmitting coils. Each stage of the transmitting coil is respectively equipped with a first switching transistor, a second switching transistor, and a unidirectional conducting device, and they share the same resonant capacitor and the same energy conversion and recharge module. The timing control module uses a time-division multiplexing method to sequentially transfer the inductive energy stored in each stage of the transmitting coil to the resonant capacitor.

6. The energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil according to claim 5, characterized in that, The timing control module uses a time-division multiplexing method to sequentially transfer the inductive energy stored in each stage of the transmitting coil to the resonant capacitor, including: At any given moment, the timing control module controls only the second switch corresponding to the first-stage transmitting coil to close, while the second switches corresponding to the other transmitting coils remain open, so that at any given moment, only the first-stage transmitting coil and the resonant capacitor form the first-stage parallel resonant circuit. The energy transfer of each stage of the transmitting coil is performed sequentially according to the order in which the projectile arrives at each stage of the coil, until the inductive energy stored in all transmitting coils has been transferred to the resonant capacitor. Only then does the timing control module start the energy conversion and recharge module.

7. The energy recovery and reuse device based on parallel resonance principle magnetoresistive transmitting coil according to claim 1, characterized in that, The timing control module is configured to execute an energy topology dynamic reconfiguration control strategy: The terminal voltage of the resonant capacitor and the output voltage of the DC power supply are obtained in real time, and the dynamic voltage drop ratio is calculated. The timing control module dynamically switches the operating timing of the first-stage parallel resonant circuit and the second-stage parallel resonant circuit according to the numerical range of the dynamic differential pressure ratio. When the dynamic differential pressure ratio is within the first preset range, the timing control module does not engage the primary winding of the transformer, allowing the first-stage parallel resonant circuit to oscillate freely to complete energy extraction. When the dynamic differential pressure ratio rises to the second preset range, the timing control module switches the primary winding of the transformer into the resonant circuit and starts the second-stage parallel resonant circuit.

8. The energy recovery and reuse device based on parallel resonance principle magnetoresistive transmitting coil according to claim 1, characterized in that, The rectifier circuit is a single-phase bridge rectifier circuit, and a spike absorption resistor is connected in series between its output terminal and the DC power supply to limit the peak value of the recharge current. The turns ratio of the transformer is set according to the ratio of the expected maximum voltage of the resonant capacitor to the rated voltage of the DC power supply.

9. The energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil according to claim 8, characterized in that, The turns ratio of the transformer is set according to the ratio of the expected maximum voltage of the resonant capacitor to the rated voltage of the DC power supply: in, This is the rated voltage of the DC power supply; This is the forward voltage drop of the diode in the rectifier circuit; This is the expected highest voltage of the resonant capacitor; This is the combined efficiency coefficient of the transformer and rectifier circuit. This refers to the turns ratio of the transformer. This is the maximum permissible charging current of the DC power supply. For safety factor; This is the equivalent load resistance referred to the primary side of the transformer.

10. The energy recovery and reuse device based on the parallel resonance principle of a magnetoresistive transmitting coil according to claim 1, characterized in that, The timing control module also includes an energy state monitoring unit for real-time detection of the terminal voltage of the resonant capacitor; When the terminal voltage reaches the first preset threshold, the timing control module starts the energy conversion and recharge module; When the terminal voltage is lower than the second preset threshold, the timing control module prohibits the start of the energy conversion and recharge module.

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