Magnetic resistance type electromagnetic coil emitter power supply based on half-control switch and control method

Abstract

The invention discloses a magnetic resistance type electromagnetic coil emitter power supply based on a half-control switch and a control method, and belongs to the technical field of electromagnetic emission. Which comprises a primary power supply and a transmitting coil connected with the primary power supply, and is characterized in that a bridge circuit is arranged between the primary power supply and the transmitting coil, a pulse capacitor is arranged in the bridge circuit, and the pulse capacitor and the transmitting coil are connected through a first discharge loop and a second discharge loop; half-control switch devices are arranged in the first discharge loop and the second discharge loop, and the conduction directions of the first discharge loop and the second discharge loop are opposite and the first discharge loop and the second discharge loop are conducted in a time-sharing manner. According to the magnetic resistance type electromagnetic coil emitter power supply based on the half-controlled switch and the control method, the pulse capacitor and the direct-current power supply are combined, so that wide pulses can be generated, under the condition of the same acceleration effect, the current amplitude is greatly reduced, the magnetization saturation degree of an armature can be reduced, and the emission efficiency of a system can be improved.

Description

Technical Field

[0001] The power supply and control method of a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch belong to the field of electromagnetic launch technology. Background Technology

[0002] A coil-type electromagnetic transmitter is an energy conversion technology that uses the principle of electromagnetic induction to convert the electromagnetic energy of a transmitting coil into the instantaneous kinetic energy required for the transmitting load. Coil-type electromagnetic transmitters are further divided into inductive coil transmitters and reluctance coil transmitters. The principle of a reluctance coil transmitter is the same as that of a reluctance linear motor. It uses a pulsed power supply to excite the coil, generating a pulsed magnetic field that magnetizes the armature of the ferromagnetic material. The magnetized armature then experiences electromagnetic attraction under the influence of the magnetic field, causing it to accelerate.

[0003] Most current coil-type electromagnetic transmitters use a pulse capacitor to directly discharge the transmitting coil, generating a strong pulsed magnetic field to accelerate the armature. However, for high-speed transmission in reluctance electromagnetic coil transmitters, the power supply circuit needs to provide a large amount of energy quickly, and the remaining energy needs to be recovered rapidly. If reducing the inductance of the transmitting coil is used to achieve rapid discharge and recovery of remaining energy, the current pulse amplitude needs to be very high, which places high demands on the current-carrying capacity of the control switch. If the capacitance of the pulse capacitor is reduced, the energy storage voltage of the pulse capacitor needs to be very high, which places high demands on the withstand voltage of the control switch. Moreover, the strong pulsed magnetic field generated by the transmitting coil can easily cause the armature to enter deep magnetic saturation, reducing system efficiency. When the magnetized armature runs at high speed, a large back electromotive force is also induced in the transmitting coil. This back electromotive force causes some of the kinetic energy of the armature to be converted into electrical energy in the transmitting coil and consumed.

[0004] Currently, several methods for recovering residual energy from the transmitting coil have been proposed in the literature to address the problem of the reverse electromagnetic pull on the armature caused by the residual energy of the transmitting coil. (1) The literature Liang CY, Xiang HJ, Yuan XC, et al. Reverse force suppression method of reluctance coil launcher based on consumption resistor[J]. IEEE Access, 2021, 9:62770-62778 proposes a method to consume the remaining energy of the launching coil using a power-consuming resistor branch. If this method is adopted, the high voltage generated across the switch or power-consuming resistor and the consumption rate of the remaining energy of the launching coil are mutually restrictive. Especially when the inductance of the launching coil is large, the voltage generated across the switch or power-consuming resistor is very high in order to achieve rapid consumption of the remaining energy of the launching coil.

[0005] (2) The literature Hui-min Deng, Yu Wang, Fa-long Lu, et al. Optimization of relief accelerator efficiency by an improved discharging circuit [J]. Defence Technology, 2019, 16(3): 662-667 proposes a method of adding a pulse capacitor branch to absorb the residual energy of the transmitting coil. Based on this method, the residual energy of the transmitting coil can be quickly recovered using a small-value pulse capacitor. However, this method does not address how to reuse the recovered residual energy.

[0006] (3) Reference Zhao Jiaqi, Li Haitao, Wu Yanan, et al. Simulation and experiment of magnetoresistive electromagnetic transmitter based on bridge power supply circuit [J]. High Voltage Engineering, 2024, 50(3):1348-1355 proposes a bridge power supply circuit for discharging the transmitting coil and recovering the remaining energy of the transmitting coil. Since the same set of pulse capacitors is used for discharging and recovering the remaining energy, in the case of high-speed armature transmission, in order to simultaneously satisfy the rapid discharge of the transmitting coil and the rapid recovery of the remaining energy, the capacitance value of the pulse capacitor is required to be small and the energy storage voltage is very high. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a power supply and control method for a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch, which can generate a wide pulse by combining a pulse capacitor with a DC power supply, significantly reducing the current amplitude under the same acceleration effect, reducing the armature magnetization saturation degree, and improving the system's transmission efficiency.

[0008] The technical solution adopted by the present invention to solve its technical problem is as follows: the power supply of the magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch includes a primary power supply and a transmitting coil connected to the primary power supply. The feature is that a bridge circuit is provided between the primary power supply and the transmitting coil, a pulse capacitor is provided in the bridge circuit, the pulse capacitor is connected to the transmitting coil through a first discharge circuit and a second discharge circuit, a semi-controlled switching device is provided in the first discharge circuit and the second discharge circuit, and the conduction directions of the first discharge circuit and the second discharge circuit are opposite and conduct in a time-division manner.

[0009] Preferably, in the first discharge circuit, the first output terminal of the pulse capacitor is connected in series with the first semi-controlled switch device to the same-name terminal of the transmitting coil, and the opposite-name terminal of the transmitting coil is connected to the second output terminal of the pulse capacitor through the fourth semi-controlled switch device.

[0010] Preferably, in the second discharge circuit, the second output terminal of the pulse capacitor is connected in series with a third semi-controlled switch to the same-name terminal of the transmitting coil, and the opposite-name terminal of the transmitting coil is connected to the first output terminal of the pulse capacitor through the second semi-controlled switch.

[0011] Preferably, an inductor is also connected between the first output terminal of the pulse capacitor and the first semi-controlled switching device.

[0012] Preferably, a diode is also connected between the primary power supply and the bridge circuit, with the positive output terminal of the primary power supply connected to the anode of the diode and the cathode of the diode connected between the inductor and the first semi-controlled switching device.

[0013] A control method for a reluctance electromagnetic coil transmitter power supply based on a semi-controlled switch is characterized by the following steps: Step 1: Precharge the pulse capacitor; Step 2: Control the first discharge circuit between the pulse capacitor and the transmitting coil to be turned on, and the pulse capacitor discharges pulse to the transmitting coil; Step 3: When the voltage across the pulse capacitor is lower than the voltage across the primary power supply, the primary power supply automatically starts supplying power to the transmitting coil. Step 4: As the primary power supply begins to supply power to the transmitting coil, the residual voltage of the pulse capacitor causes the voltage across the pulse capacitor to reverse. Step 5: After the reverse voltage across the pulse capacitor reaches its maximum, the reverse voltage of the pulse capacitor causes the semi-controlled switching device in the first discharge circuit to turn off, further disconnecting the first discharge circuit. Step 6: When the armature in the reluctance electromagnetic coil transmitter approaches the center of the transmitting coil, the second discharge circuit between the control pulse capacitor and the transmitting coil is turned on. At this time, the pulse capacitor with reverse voltage pulses and discharges to the transmitting coil. Step 7: The pulse capacitor recovers the remaining energy in the transmitting coil.

[0014] Compared with the prior art, the beneficial effects of this invention are: In the power supply and control method of the magnetoresistive electromagnetic coil transmitter based on semi-controlled switch in this application, by combining the pulse capacitor with the DC power supply, a wide pulse can be generated. Under the same acceleration effect, the current amplitude is greatly reduced, which can reduce the armature magnetization saturation and improve the system transmission efficiency.

[0015] Compared with the prior art, the technical solution of this application requires a smaller pulse capacitor value, a lower energy storage voltage, a shorter discharge time and a shorter residual energy recovery time. Moreover, the DC power supply voltage can offset part of the back electromotive force induced in the transmitting coil due to armature magnetization, and can maintain a higher current in the transmitting coil.

[0016] The primary power supply can counteract part of the back electromotive force generated by the armature magnetization on the transmitting coil, so that the armature is continuously subjected to a high electromagnetic force, which can suppress the transmitter from the electric state to the generating state.

[0017] The transmitting coil uses a wide pulse current, and the pulse capacitor recovers a high amount of residual energy. This residual energy can be directly used to pulse discharge the transmitting coil in the next transmitting cycle without needing to precharge the pulse capacitor.

[0018] The transmitting coil uses a wide pulse current with a low amplitude, which reduces the power requirements of the power supply circuit switching devices, thereby reducing the size and cost of the power supply circuit.

[0019] Using thyristors with high on-state peak current as the control switch of the power supply circuit can achieve 10 to 20 times the rated current within a few milliseconds, which can further reduce the size and cost of the power supply circuit.

[0020] The power supply and control method for a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch in this application can realize rapid and continuous transmission of the magnetoresistive electromagnetic coil transmitter at a high transmission frequency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the power supply circuit for a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch.

[0022] Figure 2 This is a flowchart of a power supply control method for a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch.

[0023] Figures 3-7 This is a schematic diagram of the power supply operation process of a magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch. Detailed Implementation

[0024] Figures 1-7 This is the preferred embodiment of the present invention, which is described below in conjunction with the accompanying drawings. Figures 1-7 The present invention will be further described below.

[0025] like Figure 1 As shown, the power supply for the magnetoresistive electromagnetic coil transmitter based on a semi-controlled switch includes a primary power supply and multiple power modules connected in parallel to the output of the primary power supply.

[0026] In the first power supply module, a diode Ds1 is included. The positive terminal of the primary power supply Us is connected to the anode of diode Ds1. The cathode of diode Ds1 is connected to the anode of thyristor Th1-1 and one end of inductor La1. The cathode of thyristor Th1-1 is also connected to the cathode of thyristor Th1-3 and the same-name terminal of transmitting coil L1. The other end of inductor La1 is also connected to the cathode of thyristor Th1-2 and one end of pulse capacitor C1. The anode of thyristor Th1-3 is also connected to the other end of pulse capacitor C1 and the cathode of thyristor Th1-4. The anodes of thyristors Th1-2 and Th1-4, and the opposite-name terminal of transmitting coil L1 are all connected to the negative terminal of the primary power supply Us.

[0027] In the second power supply module, diode Ds2 is included. The positive terminal of the primary power supply Us is connected to the anode of diode Ds2. The cathode of diode Ds2 is connected to the anode of thyristor Th2-1 and one end of inductor La2. The cathode of thyristor Th2-1 is also connected to the cathode of thyristor Th2-3 and the same-name terminal of transmitting coil L2. The other end of inductor La2 is also connected to the cathode of thyristor Th2-2 and one end of pulse capacitor C2. The anode of thyristor Th2-3 is also connected to the other end of pulse capacitor C2 and the cathode of thyristor Th2-4. The anodes of thyristors Th2-2 and Th2-4, and the opposite-name terminal of transmitting coil L2 are all connected to the negative terminal of the primary power supply Us.

[0028] In the nth power supply module, a diode Dsn is included. The positive terminal of the primary power supply Us is connected to the anode of diode Dsn. The cathode of diode Dsn is connected to the anode of thyristor Thn-1 and one end of inductor Lan. The cathode of thyristor Thn-1 is also connected to the cathode of thyristor Thn-3 and the same-name terminal of the transmitting coil Ln. The other end of inductor Lan is also connected to the cathode of thyristor Thn-2 and one end of pulse capacitor Cn. The anode of thyristor Thn-3 is also connected to the other end of pulse capacitor Cn and the cathode of thyristor Thn-4. The anodes of thyristors Thn-2 and Thn-4, and the opposite-name terminal of the transmitting coil Ln, are all connected to the negative terminal of the primary power supply Us.

[0029] Combination Figure 2 , Figure 1 The control method for the power supply of a reluctance electromagnetic coil transmitter based on a semi-controlled switch, as shown, includes the following steps: Step 1: Precharge the pulse capacitor; Precharge the pulse capacitors (C1~Cn) in each power module.

[0030] Step 2: Control the first discharge circuit between the pulse capacitor and the transmitting coil to be turned on.

[0031] A control signal is sent to the first and fourth thyristors in each power module (e.g., thyristors Th1-1 and Th1-4 in the first power module) to turn them on. After the first and fourth thyristors in the power module are turned on, the first discharge circuit between the pulse capacitor and the transmitting coil is connected, causing the pulse capacitor to discharge pulses to the transmitting coil, such as... Figure 3 As shown.

[0032] Step 3: While the pulse capacitor discharges to the transmitting coil, the primary power supply supplies power to the transmitting coil. As the pulse capacitor continuously discharges into the transmitting coil, when the voltage across the pulse capacitor is lower than the voltage across the primary power supply Us, the primary power supply Us automatically starts supplying power to the transmitting coil. Step 4: The polarity of the voltage across the pulse capacitor is reversed; As the primary power supply Us automatically begins supplying power to the transmitting coil, the residual voltage of the pulse capacitor and the energy in the inductor cause the voltage across the pulse capacitor to reverse, as shown below. Figure 4 As shown.

[0033] Step 5: The pulse capacitor forces the first discharge circuit between the pulse capacitor and the transmitting coil to be disconnected; When the current in the inductor reaches zero, the reverse voltage across the pulse capacitor reaches its maximum. This reverse voltage causes the fourth thyristor in the corresponding power module to automatically turn off, further disconnecting the first discharge circuit. Then, only the primary power supply Us powers the transmitting coil. Figure 5 As shown.

[0034] Step 6: Control the second discharge circuit between the pulse capacitor and the transmitting coil to be turned on; When the armature in the reluctance electromagnetic coil transmitter approaches the center of the transmitting coil, a control signal is sent to the second and third thyristors in each power module (such as thyristors Th1-2 and Th1-3 in the first power module) to turn them on. After the second and third thyristors in the power module are turned on, the second discharge circuit between the pulse capacitor and the transmitting coil is opened. At this time, the pulse capacitor, which has a reverse voltage, pulses and discharges to the transmitting coil, while simultaneously providing a reverse voltage drop to the first thyristor and turning it off. Figure 6 As shown.

[0035] Step 7: The pulse capacitor recovers the remaining energy in the transmitting coil; The remaining energy in the transmitting coil is recovered into the pulse capacitor, which simultaneously charges the pulse capacitor, such as... Figure 7 As shown.

[0036] When the magnetoresistive electromagnetic coil transmitter emits continuously, steps 2 to 6 above are repeated directly, and there is no need to precharge the pulse capacitor.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A power supply for a reluctance electromagnetic coil transmitter based on a semi-controlled switch, comprising a primary power supply and a transmitting coil connected to the primary power supply, characterized in that: A bridge circuit is provided between the primary power supply and the transmitting coil. A pulse capacitor is provided in the bridge circuit. The pulse capacitor is connected to the transmitting coil through a first discharge circuit and a second discharge circuit. Semi-controlled switching devices are provided in the first discharge circuit and the second discharge circuit. The first discharge circuit and the second discharge circuit are in opposite directions and are time-divisionally activated.

2. The power supply for a reluctance electromagnetic coil transmitter based on a semi-controlled switch according to claim 1, characterized in that: In the first discharge circuit, the first output terminal of the pulse capacitor is connected in series with the first semi-controlled switch to the same-name terminal of the transmitting coil, and the opposite-name terminal of the transmitting coil is connected to the second output terminal of the pulse capacitor through the fourth semi-controlled switch.

3. The power supply for a reluctance electromagnetic coil transmitter based on a semi-controlled switch according to claim 1, characterized in that: In the second discharge circuit, the second output terminal of the pulse capacitor is connected in series with the third semi-controlled switch to the same-name terminal of the transmitting coil, and the opposite-name terminal of the transmitting coil is connected to the first output terminal of the pulse capacitor through the second semi-controlled switch.

4. The power supply for a reluctance electromagnetic coil transmitter based on a semi-controlled switch according to claim 2, characterized in that: An inductor is also connected between the first output terminal of the pulse capacitor and the first semi-controlled switching device.

5. The power supply for a reluctance electromagnetic coil transmitter based on a semi-controlled switch according to claim 4, characterized in that: A diode is connected between the primary power supply and the bridge circuit. The positive output of the primary power supply is connected to the anode of the diode, and the cathode of the diode is connected between the inductor and the first semi-controlled switching device.

6. A control method for a reluctance electromagnetic coil transmitter power supply based on a semi-controlled switch as described in any one of claims 1 to 5, characterized in that: Includes the following steps: Step 1: Precharge the pulse capacitor; Step 2: Control the first discharge circuit between the pulse capacitor and the transmitting coil to be turned on, and the pulse capacitor discharges pulse to the transmitting coil; Step 3: When the voltage across the pulse capacitor is lower than the voltage across the primary power supply, the primary power supply automatically starts supplying power to the transmitting coil. Step 4: As the primary power supply begins to supply power to the transmitting coil, the residual voltage of the pulse capacitor causes the voltage across the pulse capacitor to reverse. Step 5: After the reverse voltage across the pulse capacitor reaches its maximum, the reverse voltage of the pulse capacitor causes the semi-controlled switching device in the first discharge circuit to turn off, further disconnecting the first discharge circuit. Step 6: When the armature in the reluctance electromagnetic coil transmitter approaches the center of the transmitting coil, the second discharge circuit between the control pulse capacitor and the transmitting coil is turned on. At this time, the pulse capacitor with reverse voltage pulses and discharges to the transmitting coil. Step 7: The pulse capacitor recovers the remaining energy in the transmitting coil.

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