High-voltage large-current low-consumption discharge circuit

Abstract

The invention relates to the technical field of electric propulsion, in particular to a high-voltage large-current low-consumption discharging circuit which comprises a switching power supply, a capacitor, an IGBT (insulated gate bipolar transistor) switch, a transformer and a load coil. The collector electrode of the IGBT switch is connected with one end of the capacitor, and the emitter electrode is connected with one input end of the transformer. The other end of the capacitor is directly connected with the other input end of the transformer; the output end of the transformer is connected in parallel with the load coil. The problems of heat energy loss generated in transmission of a high-voltage large-current circuit, electromagnetic interference induced by large current and selection of ultrahigh voltage-withstanding and current-withstanding components are solved, the design difficulty and the integrated production and manufacturing difficulty of the high-voltage pulse large-current circuit are reduced, the production cost is reduced, the production period is shortened, the reliability of the circuit is improved, and the service life of the circuit is prolonged.

Description

Technical Field

[0001] The present application relates to the field of electric propulsion technology, and in particular to a high-voltage, high-current, low-consumption discharge circuit. Background Art

[0002] The field-anti-configuration plasma thruster is a new type of high-power electric propulsion technology that can be used for deep space exploration, space cargo and interstellar navigation. While combining the advantages of high power, high specific impulse and large thrust, it can operate at a power level of 10kW to megawatts and is a new type of electromagnetic propulsion technology with excellent performance. It can fully meet the needs of my country's deep space missions for high-power electric propulsion systems.

[0003] The principle is that the gas supply system provides working fluid gas, and the rotating magnetic field drives the pre-ionized plasma to generate angular current. As the angular current increases, the reverse magnetic field in the plasma area overcomes the background magnetic field to produce field reversal, and finally forms a magnetically closed field anti-structure. Finally, under the action of the Lorentz force of the background magnetic field, it is accelerated and ejected axially to generate thrust.

[0004] During the operation of the thruster, a rotating magnetic field is required to drive the plasma to generate angular currents. The rotating magnetic field needs to add a large current of about 5000A @10kV high voltage to two pairs of mutually perpendicular antennas. In the circuit, due to the inevitable resistance of the transmission line, a large amount of energy is lost in the form of high heat when transmitting a large current of 5000A. At the same time, high voltage and high current also bring new problems to the system's electromagnetic shielding and protection, and the selection of high-voltage resistant devices, seriously or even significantly limiting the working life and reliability improvement of the thruster. Summary of the Invention

[0005] The present application provides a high-voltage, high-current, low-consumption discharge circuit that can solve the heat loss and electromagnetic interference induced by high current generated during high-voltage, high-current circuit transmission.

[0006] In order to achieve the above-mentioned objectives, the present application provides a high-voltage, high-current, low-consumption discharge circuit, including a switching power supply, a capacitor, an IGBT switch, a transformer and a load coil, wherein: the switching power supply is connected in parallel with both ends of the capacitor; the collector of the IGBT switch is connected to one end of the capacitor, and the emitter is connected to one input end of the transformer; the other end of the capacitor is directly connected to the other input end of the transformer; and the output end of the transformer is connected in parallel with the load coil.

[0007] Furthermore, the capacitor includes a first capacitor, a second capacitor and a third capacitor, and both ends of the first capacitor, the second capacitor and the third capacitor are connected in parallel with the switching power supply.

[0008] Furthermore, the IGBT switch includes a first IGBT switch, a second IGBT switch and a third IGBT switch, and the first IGBT switch, the second IGBT switch and the third IGBT switch are of the same model.

[0009] Furthermore, it also includes a DC power supply, the positive electrode of the DC power supply is connected to the gates of the first IGBT switch, the second IGBT switch and the third IGBT switch respectively, and the first IGBT switch, the second IGBT switch and the third IGBT switch are triggered synchronously.

[0010] Furthermore, the transformer is capable of withstanding a high voltage of 20 kV and includes a first transformer, a second transformer and a third transformer, and the first transformer, the second transformer and the third transformer are of the same model.

[0011] Furthermore, the collector of the first IGBT switch is connected to one end of the first capacitor, and the emitter is connected to an input end of the first transformer; the collector of the second IGBT switch is connected to one end of the second capacitor, and the emitter is connected to an input end of the second transformer; the collector of the third IGBT switch is connected to one end of the third capacitor, and the emitter is connected to an input end of the third transformer.

[0012] Furthermore, the other end of the first capacitor is directly connected to the other input end of the first transformer; the other end of the second capacitor is directly connected to the other input end of the second transformer; and the other end of the third capacitor is directly connected to the other input end of the third transformer.

[0013] Furthermore, the output end of the first transformer, the output end of the second transformer, and the output end of the third transformer are all connected in parallel to the load coil.

[0014] Furthermore, it also includes an oscilloscope, wherein the first current probe of the oscilloscope is arranged on the connecting wire between the switching power supply and the first capacitor; the second current probe of the oscilloscope is arranged on the connecting wire between the first capacitor and the first transformer; and the third current probe of the oscilloscope is arranged on the connecting wire of the load coil.

[0015] The present application provides a high-voltage, high-current, low-consumption discharge circuit with the following beneficial effects:

[0016] (1) This application realizes synchronous control of parallel circuits by controlling three IGBT switches by the same DC power supply, with a response time of nanoseconds; by connecting multiple sets of transformers in parallel, a large current of 5000A can be achieved, solving the problem of heat loss generated during the transmission of large current circuits; the amplitude and phase of the input and output currents are measured by an oscilloscope to determine whether the target current is met. The measurement results provide support for analyzing circuit losses and the rationality of circuit design. According to the detection signal, a voltage and current protection device for the circuit can be designed.

[0017] (2) This application solves the problem of heat loss generated during the transmission of high-voltage pulse and high-current circuits, saving energy costs; solves the problem of electromagnetic interference induced by large currents, protects the circuit itself from interference from the external electromagnetic environment, and ensures that the circuit can operate normally, thereby improving the overall stability and reliability of the system; solves the problem of selecting ultra-high voltage and current components, broadens the range of component selection, and can use components with better performance and higher reliability to build the system, which is conducive to improving the overall performance of the system, thereby meeting the needs of more complex application scenarios.

[0018] (3) This application is applied to field-reversed plasma thrusters, which reduces the design difficulty and integrated manufacturing difficulty of high-voltage pulse and high-current circuits, reduces production costs and cycles, and improves the reliability and service life of the circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute part of this application are used to provide a further understanding of this application and make other features, objects and advantages of this application more apparent. The illustrative embodiment drawings of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0020] Figure 1 Schematic diagram of a high-voltage, high-current, low-consumption discharge circuit provided according to an embodiment of the present application;

[0021] In the figure: 1-switching power supply, 2-first capacitor, 3-second capacitor, 4-third capacitor, 5-first IGBT switch, 6-second IGBT switch, 7-third IGBT switch, 8-first transformer, 9-second transformer, 10-third transformer, 11-DC power supply, 12-load coil, 13-oscilloscope. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0025] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0026] Additionally, the term "plurality" shall mean two or more.

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] like Figure 1 As shown, the present application provides a high-voltage, high-current, low-consumption discharge circuit, including a switching power supply 1, a capacitor, an IGBT switch, a transformer and a load coil 12, wherein: the switching power supply 1 is connected in parallel with both ends of the capacitor; the collector of the IGBT switch is connected to one end of the capacitor, and the emitter is connected to one input end of the transformer; the other end of the capacitor is directly connected to the other input end of the transformer; and the output end of the transformer is connected in parallel with the load coil 12.

[0029] Specifically, the high-voltage, high-current, low-consumption discharge circuit provided in the embodiment of the present application is mainly intended to solve the problems of heat loss generated in the transmission of high-voltage pulse and high-current circuits, electromagnetic interference induced by large currents, and the selection of ultra-high voltage and current-resistant components. Among them, capacitors, IGBT switches and transformers are arranged in multiple groups. The IGBT switches are triggered synchronously to make the current amplitude and phase of the parallel circuits equal, and the transformer output currents are connected in parallel to obtain the target high current.

[0030] Furthermore, the capacitor includes a first capacitor 2 , a second capacitor 3 and a third capacitor 4 , and both ends of the first capacitor 2 , the second capacitor 3 and the third capacitor 4 are connected in parallel with the switching power supply 1 .

[0031] Furthermore, the IGBT switch includes a first IGBT switch 5 , a second IGBT switch 6 and a third IGBT switch 7 , and the first IGBT switch 5 , the second IGBT switch 6 and the third IGBT switch 7 are of the same model.

[0032] Furthermore, it also includes a DC power supply 11, the positive pole of the DC power supply 11 is connected to the gates of the first IGBT switch 5, the second IGBT switch 6 and the third IGBT switch 7 respectively, and the first IGBT switch 5, the second IGBT switch 6 and the third IGBT switch 7 are triggered synchronously.

[0033] Furthermore, the transformer is capable of withstanding a high voltage of 20 kV and includes a first transformer 8 , a second transformer 9 and a third transformer 10 , and the first transformer 8 , the second transformer 9 and the third transformer 10 are of the same model.

[0034] Furthermore, the collector of the first IGBT switch 5 is connected to one end of the first capacitor 2, and the emitter is connected to an input end of the first transformer 8; the collector of the second IGBT switch 6 is connected to one end of the second capacitor 3, and the emitter is connected to an input end of the second transformer 9; the collector of the third IGBT switch 7 is connected to one end of the third capacitor 4, and the emitter is connected to an input end of the third transformer 10.

[0035] Furthermore, the other end of the first capacitor 2 is directly connected to the other input end of the first transformer 8; the other end of the second capacitor 3 is directly connected to the other input end of the second transformer 9; and the other end of the third capacitor 4 is directly connected to the other input end of the third transformer 10.

[0036] Furthermore, the output end of the first transformer 8 , the output end of the second transformer 9 , and the output end of the third transformer 10 are all connected in parallel to the load coil 12 .

[0037] Specifically, in the embodiment of the present application, three capacitors are preferably provided, and the three capacitors are of the same model, and the specific parameters are selected according to actual needs; three IGBT switches are preferably provided, and the three IGBT switches are of the same model, and the specific parameters are selected according to actual needs. The three IGBT switches are controlled by the same DC power supply 11 to achieve synchronous control of the parallel circuit, and the response time is in nanoseconds; three transformers are preferably provided, and all three transformers are step-down transformers with the same model and can withstand a high voltage of 20kV. By connecting multiple groups of transformers in parallel, a large current of a load target of 5000A can be achieved, solving the problem of heat energy loss generated during high current circuit transmission.

[0038] Furthermore, it also includes an oscilloscope 13, the first current probe of the oscilloscope 13 is set on the connecting wire between the switching power supply 1 and the first capacitor 2; the second current probe of the oscilloscope 13 is set on the connecting wire between the first capacitor 2 and the first transformer 8; the third current probe of the oscilloscope 13 is set on the connecting wire of the load coil 12.

[0039] Specifically, the oscilloscope 13 is used to measure the amplitude and phase of the input and output currents to determine whether the target current is met; the first current probe of the oscilloscope 13 is set on the connecting wire between the switching power supply 1 and the first capacitor 2 to measure the amplitude and phase of the charging circuit current; the second current probe of the oscilloscope 13 is set on the connecting wire between the first capacitor 2 and the first transformer 8 to measure the amplitude and phase of the capacitor discharge current; the third current probe of the oscilloscope 13 is set on the connecting wire of the load coil 12 to measure the amplitude and phase of the target current. According to the input and output currents measured by the oscilloscope 13, the phase difference is compared to determine the response speed of the switching module, and the amplitude is compared to determine whether the design method meets the theoretically calculated current amplification factor. At the same time, the load energy is calculated based on the power supply output energy and the measured current of the load coil 12, and the energy loss in the circuit can be calculated.

[0040] More specifically, during operation, the high-voltage, high-current, low-consumption discharge circuit provided by the embodiment of the present application turns on the switching power supply 1, connects the charging circuit power supply, and charges the first capacitor 2, the second capacitor 3, and the third capacitor 4; the IGBT switch load controls the on / off of the discharge circuit, and the capacitor begins to discharge the circuit after the IGBT is turned on; the current generated by the discharge is transmitted from the left circuit of the transformer to the right circuit, reducing the voltage while increasing the current value; the output currents of the three groups of transformers are output in parallel to the load coil 12 to achieve the required target high current. Subsequently, according to the detection results of the oscilloscope 13, if it is found that the detection circuit exceeds the tolerance range of the circuit components, the circuit switch is promptly cut off to protect the circuit device. The circuit of the present application as a whole obtains the ideal current by using multiple transformers with the same rated voltage and the same connection group in parallel; using multiple IGBT switches to simultaneously control the on / off of the parallel circuit, it solves the problems of heat loss, electromagnetic interference induced by large current, and the selection of ultra-high voltage and current components generated in the transmission of high-voltage pulse and large current circuits, and provides a feasible means for achieving large load current.

[0041] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-voltage, high-current, low-consumption discharge circuit, characterized in that: It includes a switching power supply, capacitors, IGBT switches, transformers, and load coils, including: The switching power supply is connected in parallel with both ends of the capacitor; The collector of the IGBT switch is connected to one end of the capacitor, and the emitter is connected to an input end of the transformer; The other end of the capacitor is directly connected to the other input end of the transformer; The output end of the transformer is connected in parallel with the load coil.

2. The high-voltage, high-current, low-consumption discharge circuit according to claim 1, characterized in that: The capacitors include a first capacitor, a second capacitor, and a third capacitor, and both ends of the first capacitor, the second capacitor, and the third capacitor are connected in parallel with the switching power supply.

3. The high-voltage, high-current, low-consumption discharge circuit according to claim 2, characterized in that: The IGBT switch includes a first IGBT switch, a second IGBT switch and a third IGBT switch, and the first IGBT switch, the second IGBT switch and the third IGBT switch are of the same model.

4. The high-voltage, high-current, low-consumption discharge circuit according to claim 3, characterized in that: It also includes a DC power supply, the positive electrode of which is connected to the gates of the first IGBT switch, the second IGBT switch and the third IGBT switch respectively, and the first IGBT switch, the second IGBT switch and the third IGBT switch are triggered synchronously.

5. The high-voltage, high-current, low-consumption discharge circuit according to claim 4, characterized in that: The transformer is capable of withstanding a high voltage of 20 kV and includes a first transformer, a second transformer and a third transformer, wherein the first transformer, the second transformer and the third transformer are of the same model.

6. The high-voltage, high-current, low-consumption discharge circuit according to claim 5, characterized in that: The collector of the first IGBT switch is connected to one end of the first capacitor, and the emitter is connected to an input end of the first transformer; the collector of the second IGBT switch is connected to one end of the second capacitor, and the emitter is connected to an input end of the second transformer; the collector of the third IGBT switch is connected to one end of the third capacitor, and the emitter is connected to an input end of the third transformer.

7. The high-voltage, high-current, low-consumption discharge circuit according to claim 6, characterized in that: The other end of the first capacitor is directly connected to the other input end of the first transformer; the other end of the second capacitor is directly connected to the other input end of the second transformer; and the other end of the third capacitor is directly connected to the other input end of the third transformer.

8. The high-voltage, high-current, low-consumption discharge circuit according to claim 7, characterized in that: The output end of the first transformer, the output end of the second transformer, and the output end of the third transformer are all connected in parallel to the load coil.

9. The high-voltage, high-current, low-consumption discharge circuit according to claim 8, characterized in that: It also includes an oscilloscope, wherein the first current probe of the oscilloscope is arranged on the connecting wire between the switching power supply and the first capacitor; the second current probe of the oscilloscope is arranged on the connecting wire between the first capacitor and the first transformer; and the third current probe of the oscilloscope is arranged on the connecting wire of the load coil.

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