Pulse power control device

Abstract

The present invention relates to a pulse power control device, comprising: a power supply unit that converts and transmits an external commercial power source into DC; a main charging switching element connected to the power supply unit; n (where n is a natural number) unit charging switching elements connected in parallel to the main charging switching element; a large-capacity capacitor connected to each of the unit charging switching elements; a unit discharge switching element connected to each of the large-capacity capacitors; a main discharge switching element connected in parallel to the unit discharge switching elements; an output unit connected to the main discharge switching element to transmit power to an electromagnetic pinning device; and a control unit that controls the switching times of the main charging switching element and the unit charging switching element, and the main discharge switching element and the unit discharge switching element, such that the amount of power output transmitted to the output unit becomes a combination of the charging and discharging amounts of 1 to n large-capacity capacitors. The present invention provides the advantage of a pulse power control device that controls the input power in the pulse power device to set optimal pinning conditions suitable for each application field, resets the charging energy of capacitors with long charging times to prevent damage to pinning quality in advance, and prevents the risk of safety accidents for users.

Description

Technology Field The present invention relates to a pulse power control device, wherein unit charging switching elements connected in parallel with a main switching element operate in various combinations to charge a capacitor, and the charged capacitor is discharged at the required time through a main discharging switching element and a unit discharging switching element to supply power to a pulse power device, thereby optimizing processing quality. Background Technology A pulse power device is a power supply system that utilizes high voltage and high current to generate electrical pulses and supply massive power for a specific period of time. This device is primarily utilized for industrial and military applications, such as plasma welding and electromagnetic welding, and the pulse power device can supply very powerful energy by storing high-voltage electrical energy and releasing it all at once. Pulse power devices are utilized in various fields, including representative examples such as Marx generators, Blumlein generators, pulse forming networks (PFNs), and modular pulse power systems. An electromagnetic pinning device is also one of such pulse power devices, and the electromagnetic pinning device will be described below as an example. Generally, peening refers to a mechanical treatment that improves surface strength by striking a metal surface with a hammer. In the case of welding, it is a surface treatment method that involves hammering the weld bead surface to relieve stress and prevent cracking and deformation, and various methods such as shot peening, laser peening, ultrasonic peening, and water jet peening are used. Among these, shot peening is the most widely used. Shot peening is a surface treatment method in which steel balls called shot balls are struck at high speed on the surface of metal materials and welded joints to leave compressive stress on the outer surface of the workpiece. It is applied to metal materials in advanced machinery fields such as gears of various shapes, steam or gas turbine parts, aircraft landing gear parts, helicopter propeller drive shafts and blades, compressors and high-performance engine parts, pistons, crankshafts, and connecting rods. As prior art regarding shot peening, numerous patents have been introduced, such as the Korean Utility Model No. 20-0195305 Shot Peening Machine. However, shot peening devices are unsuitable for precision parts as they fail to provide sufficient strength and fine processing for the surface of metal materials; they cause damage to the metal surface, making post-processing cumbersome; they fail to uniformly increase surface strength; the steel balls used cause harm to the human body and generate pollution; and they are large and difficult to move due to the need for pumps to forcefully shoot the balls. In order to solve the problems of such shot peening, the applicant has invented the Electromagnetic Peening Device (Korean Patent Application No. 10-2019-0011772), the Surface Treatment Method for Improving the Durability Life of a Stent (Korean Patent Application No. 10-2019-0155940), and the Electromagnetic Peening Device by Submerged Discharge (Korean Patent Registration No. 10-2065434), thereby providing an Electromagnetic Peening Device that enables surface treatment of a large area of ​​a workpiece, eliminates problems such as surface defects, wear, and lubrication caused by contact during surface treatment, allows for repetitive operations, and enables environmentally friendly surface treatment. The present invention improves and optimizes the problems that appear during the development process. With the development of such electromagnetic pinning inventions, the need for stable power input and pinning control input emerged, leading to continuous development of power input technology capable of improving equipment efficiency and increasing productivity through equipment fault diagnosis and prediction. The applicant also invented Korean Patent Registration No. 10-2387779, providing an electromagnetic pinning power failure diagnosis and prediction monitoring system capable of improving equipment efficiency and increasing productivity by monitoring power input device failures and predicting lifespan to execute stable power input and pinning control for an electromagnetic pinning device. Meanwhile, in such electromagnetic pinning devices, the control of the input power has a significant impact on the pinning quality, but a problem requiring improvement has arisen because it is difficult to control the appropriate input amount with a standard commercial capacitor. More specifically, depending on the characteristics, electromagnetic peening can be applied to parts requiring high strength in the aerospace industry, such as engine components and landing gear; to parts requiring durability in the automotive industry, such as engine components and suspension components; to parts used in high-temperature and high-pressure environments in the energy industry, such as turbine blades and pump impellers; and to extend mold life in the mold industry. Due to these characteristics, the pinning effect of an electromagnetic pinning device can vary depending on various variables (pulse energy, pulse width, pulse repetition rate, etc.); therefore, it is crucial to establish optimal pinning conditions suitable for each application. However, electromagnetic pinning devices generate pulsed power using large-capacity capacitors; since the commercial capacitance of such capacitors is fixed, there is a technical problem in that optimal pinning conditions suitable for each of the aforementioned application fields cannot be set. On the other hand, while a capacitor is a device that stores electricity, it is very difficult to maintain a charge perfectly. In other words, over time, natural discharge occurs due to leakage current, the capacitor's internal resistance changes with variations in ambient temperature, energy loss occurs due to heat, and performance may degrade due to external environmental or internal factors. In addition, the charge state may change as an induced current is generated in the capacitor due to the influence of an external electromagnetic field. However, in the case of electromagnetic pinning, since the pinning quality is controlled by the input pulse, there is a technical problem in that when using charging energy from a capacitor with an old charging time, a damaged input is transmitted for the aforementioned reason, causing damage to the pinning quality. Furthermore, maintaining a prolonged capacitor charge time in electromagnetic pinning devices presents a technical problem that can cause safety hazards for users, and this technical issue found in such devices is also a problem commonly encountered in pulse power devices. Prior art literature

[0001] Republic of Korea Patent Application No. 10-2019-0011772 Electromagnetic peening device

[0002] Republic of Korea Patent Application No. 10-2019-0155940 Surface treatment method for improving the durability life of a stent,

[0003] Republic of Korea Patent Registration No. 10-2065434 Electron pinning device by submerged discharge

[0004] Republic of Korea Patent Registration No. 10-2387779 Electromagnetic Pinning Power Fault Diagnosis Prediction Monitoring System The problem to be solved The present invention aims to solve the aforementioned technical problems by providing a pulse power control device that controls the input power in a pulse power device to set optimal pinning conditions suitable for each application field, resets the charging energy of capacitors with long charging times to prevent damage to pinning quality in advance, and prevents the risk of safety accidents for users. means of solving the problem To achieve the above objective, the present invention provides a pulse power control device comprising: a power supply unit that converts and transmits an external commercial power source into DC; a main charging switching element connected to the power supply unit; n (where n is a natural number) unit charging switching elements connected in parallel to the main charging switching element; a large-capacity capacitor connected to each of the unit charging switching elements; a unit discharge switching element connected to each of the large-capacity capacitors; a main discharge switching element connected in parallel to the unit discharge switching elements; an output unit connected to the main discharge switching element to transmit power to an electromagnetic pinning device; and a control unit that controls the switching times of the main charging switching element and the unit charging switching element, and the main discharge switching element and the unit discharge switching element, so that the amount of power output transmitted to the output unit becomes a combination of the charging and discharging amounts of 1 to n large-capacity capacitors. The technical gist of the invention is a pulse power control device that converts the pulse output of a pulse power device. In the present invention, it is preferable that the pulse power control device further comprises an emergency discharge switch connected in parallel to the large-capacity capacitor; and a discharge resistor connected to the emergency discharge switch to attenuate and dissipate the power transmitted thereto, so as to emergency discharge the large-capacity capacitor when it is difficult to output the charging power of the large-capacity capacitor to the output section. In addition, it is preferable that the above emergency discharge switch be a pulse power control device characterized by being composed of a physical switch that allows a user to operate the discharge. In addition, it is preferable that the above-described control unit be a pulse power control device characterized by inputting m (where m is a natural number) as the number of unit capacitors used, dividing the above-described large-capacity capacitors into unit capacitors, and controlling the charging and discharging of each unit capacitor alternately. In addition, it is preferable that the above-described control unit be a pulse power control device characterized by, when inputting the required power amount of the above-described output unit, calculating the required number of unit capacitor groups k (where k is a natural number less than or equal to n), dividing the above-described large-capacity capacitors into k unit capacitor groups, and controlling the charging and discharging of each unit capacitor alternately. Effects of the invention According to the present invention described above, there is an advantage in providing a pulse power control device that controls the input power in the pulse power device to set optimal pinning conditions suitable for each application field, resets the charging energy of capacitors with long charging times to prevent damage to pinning quality in advance, and prevents the risk of safety accidents for the user. Brief explanation of the drawing FIG. 1 is a configuration diagram of the present invention Specific details for implementing the invention The present invention will be examined below with reference to the drawings. In describing the present invention, if it is determined that a detailed description of related known technologies or configurations may unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, the terms described below are defined in consideration of their functions in the present invention; since these may vary depending on the intentions or practices of the user or operator, their definitions should be based on the content throughout this specification describing the present invention. The present invention is a pulse power control device that controls the power of a pulse power device. Hereinafter, for the purpose of explaining the present invention, an electromagnetic peening device will be described as an embodiment of the pulse power device. The electromagnetic peening device is disclosed in the prior art Korean Patent Application No. 10-2019-0011772 (Electromagnetic peening device), Korean Patent Application No. 10-2019-0155940 (Surface treatment method for improving the durability life of a stent), Korean Patent Registration No. 10-2065434 (Electromagnetic peening device by submerged discharge), and Korean Patent Registration No. 10-2387779 (Electromagnetic peening power supply failure diagnosis prediction monitoring system). Electromagnetic peening is a surface treatment technique that forms fine pits by applying strong magnetic field pulses to the surface of a metal. These fine pits have the effect of increasing the surface strength of the metal, extending fatigue life, and inhibiting corrosion. The electromagnetic peening device generates a strong magnetic field as an input current pulse flows through a coil, and the magnetic field concentrated on the metal surface near the coil induces eddy currents inside the metal, which generates a tremendous force and causes the metal surface to deform slightly, and the fine pits formed on the metal surface exhibit a peening effect that increases the surface strength of the metal. The electromagnetic peening device has the characteristics of significantly increasing the strength of the metal surface through fine marks, extending the lifespan of components by suppressing the occurrence of fatigue cracks through surface hardening, inhibiting corrosion by absorbing corrosion-promoting factors through the fine marks, and improving product reliability by reducing residual stress generated during processing. Based on the aforementioned characteristics, electromagnetic peening can be applied to parts requiring high strength, such as engine components and landing gear, in the aerospace industry; to parts requiring durability, such as engine components and suspension components, in the automotive industry; to parts used in high-temperature and high-pressure environments, such as turbine blades and pump impellers, in the energy industry; and to extend mold life in the mold industry. Due to these characteristics, the pinning effect of an electromagnetic pinning device can vary depending on various variables (pulse energy, pulse width, pulse repetition rate, etc.); therefore, it is crucial to establish optimal pinning conditions suitable for each application. The pulse power supply used for electromagnetic pinning utilizes a large-capacity capacitor; however, since the commercial capacitance of such capacitors is fixed, there is a technical problem in that optimal pinning conditions cannot be set for each of the aforementioned application fields. These technical problems are also common technical problems in pulse power devices. In order to solve such technical problems, the present invention provides a pulse power control device configured to include a power supply unit (20), a main charging switching element (30), a unit charging switching element (40), a large-capacity capacitor (50), a unit capacitor (500), a unit discharge switching element (60), a main discharge switching element (70), an emergency discharge switch (100), a discharge resistor (110), an output unit (80), and a control unit (90), as shown in the drawing. The power supply unit (20) of the present invention is a device that converts an external commercial power source (10) into DC power and supplies stable power to the system. The main charging switching element (30) is connected to the power supply (20) and performs the main switch function of charging the converted DC power into the large-capacity capacitor (50). The above n (n is a natural number) unit charging switching elements (40) are connected in parallel with the main charging switching element (30) to enable more precise power control, and each is connected to the above-mentioned large-capacity capacitor (50). The above-mentioned large-capacity capacitor (50) is a device that stores charged electricity and releases it at the moment it is needed to generate a powerful pulse. The above n (n is a natural number) unit discharge switching elements (60) are each connected to the above-mentioned large-capacity capacitor (50), and the unit discharge switching elements (60) are connected in parallel to the main discharge switching element (70). The unit discharge switching element (60) and the main discharge switching element (70) are connected in parallel in this manner to perform the main switch function of discharging electricity stored in the large-capacity capacitor (50) and to generate various discharge patterns. The output unit (80) is a device that transmits electricity emitted from a large-capacity capacitor (50) to a load, and the electrode material, shape, arrangement, etc. of the output unit vary depending on the type of pulse power device used. For example, in the case of an electromagnetic pinning device, the output section generates a magnetic field by transmitting pulses to an electromagnetic coil. The above control unit (90) precisely controls the operation of all switching elements to regulate output power and optimizes the output characteristics of the pulse power device. The above control unit (90) is a circuit unit that controls the switching time of the main charging switching element (30) and the unit charging switching element (40), and the main discharging switching element (70) and the unit discharging switching element (60) so that the power output amount transmitted to the output unit (80) becomes a combination of the charging and discharging amounts of 1 to n large-capacity capacitors (50). Accordingly, the above-mentioned large-capacity capacitor (50) is selected to be charged and discharged according to the combination of the main charging switching element (30) and the unit charging switching element (40). In the present invention, when the control unit (90) inputs m (m is a natural number) as the number of unit capacitors (500) to be used, it controls the main charging switching element (30) and the unit charging switching element (40), and the main discharging switching element (70) and the unit discharging switching element (60) in combination so as to distinguish the large-capacity capacitor (50) into unit capacitors (500). The embodiment of FIG. 1 illustrates an example in which two large-capacity capacitors (50) are formed as separate unit capacitors (500). When 10 large-capacity capacitors (50) are formed, they can be controlled by a combination of 5 unit capacitors (500). The above control unit controls the main charging switching element (30), the unit charging switching element (40), the main discharging switching element (70), and the unit discharging switching element (60) so that charging and discharging alternate for each unit capacitor (500), thereby enabling continuous charging and discharging. In addition, when the control unit (90) inputs the required power amount of the output unit (80), it calculates the number of required unit capacitor (500) groups k (k is a natural number less than or equal to n) and divides the large-capacity capacitors (50) into k unit capacitor (500) groups, and controls the charging and discharging to alternate for each unit capacitor (500) group. Pulse power devices drive high-power lasers for use in material processing and medical fields; generate plasma for nuclear fusion research and space propulsion; generate powerful electromagnetic waves for use in electromagnetic pulse weapons and radiation generation; accelerate particles for use in material analysis and cancer treatment; and are utilized in various industrial fields such as welding, cutting, and surface treatment. Among these, electromagnetic peening devices belong to the category of devices used in surface treatment applications. Taking electromagnetic peening devices as an example, depending on the surface treatment characteristics, they can be applied to parts requiring high strength in the aerospace industry, such as engine components and landing gear; to parts requiring durability in the automotive industry, such as engine components and suspension components; to parts used in high-temperature and high-pressure environments in the energy industry, such as turbine blades and pump impellers; and to extend mold life in the mold industry. Therefore, since the pinning effect of an electromagnetic pinning device can vary depending on various variables (pulse energy, pulse width, pulse repetition rate, etc.), it is very important to set optimal pinning conditions suitable for each application field. The pulse power control device of the present invention has the advantage of being able to set optimal pinning conditions suitable for each application field as the number of unit capacitors (500) used, thereby enabling charging and discharging control suitable for each application field. That is, the present invention can be applied to various materials and thicknesses by generating pulses of various intensities and shapes through a combination of switching elements, and improves pinning quality by precisely adjusting the intensity, width, and repetition period of the pulses through the control unit (90), and minimizes energy loss by efficiently using the energy charged in the large-capacity capacitor (50). In addition, since automated peening operations are possible through the control system, it has the advantage of being suitable for producing high-quality products in various industrial fields. Meanwhile, the emergency discharge switch (100) of the present invention is configured to be connected in parallel to the large-capacity capacitor (50). The above emergency discharge switch (100) is connected to a discharge resistor (110) to limit excessive current generated during emergency discharge and to safely consume energy, thereby attenuating and extinguishing the transmitted power. For example, since the electromagnetic pinning device is a system that handles high voltage and high current, if an excessive voltage is applied to the large-capacity capacitor (50) for various reasons or if a malfunction occurs in the system, it is necessary to safely consume the energy stored in the large-capacity capacitor (50). In preparation for such cases, the present invention forms an emergency discharge system using the emergency discharge switch (100) and the discharge resistor (110). The above emergency discharge switch (100) is a switch that rapidly discharges the above-mentioned large-capacity capacitor (50) when an emergency situation occurs, and generally, a device such as a MOSFET or IGBT with excellent high-speed responsiveness is used and can be executed by the above-mentioned control unit (90). As described above, the large-capacity capacitor (50) undergoes natural discharge due to leakage current over time, the internal resistance of the large-capacity capacitor (50) changes according to changes in ambient temperature, energy loss due to heat occurs, and performance may degrade due to external environment or internal factors. Therefore, in the case of electromagnetic peening, since the peening quality is controlled by the input pulse, using charging energy from a capacitor with an old charging time may result in damaged pulses being transmitted, which can cause quality degradation during precision peening. Therefore, when the above emergency discharge switch (100) is used as a device such as a MOSFET or an IGBT, it has the advantage of being able to operate under the control of the control unit (90) according to the charging time to reset the charging state and secure a precision pinning execution state. Meanwhile, the emergency discharge switch (100) of the present invention is not limited thereto and may use a physical switch. A physical switch is a device that connects or disconnects an electrical circuit by mechanical means; physical switches used in the emergency discharge circuit of an electromagnetic pinning device may include contact switches, relays, circuit breakers, etc. Physical switches have a simple structure, resulting in a low failure rate and stable operation over long periods. Since the contacts connect or disconnect directly, they can reliably interrupt the circuit, and compared to electronic switches, they are more resistant to changes in the external environment, enabling stable operation even in extreme conditions. In addition, since it can be executed immediately by the user through direct mechanical operation without electronic signal processing, it has the advantage of minimizing system damage by rapidly shutting off the circuit in the event of an emergency. The drawings illustrated above for the purpose of explaining the present invention are one embodiment in which the present invention is embodied, and it can be seen that various combinations are possible to realize the gist of the present invention as illustrated in the drawings. Therefore, the present invention is not limited to the embodiments described above, and the technical spirit of the present invention extends to the scope in which various modifications can be made by anyone with ordinary knowledge in the field to which the invention belongs, without departing from the essence of the invention as claimed in the following patent claims. Explanation of the symbols 20 : Power supply 30: Main charging switching element 40: Unit charging switching element 50: Large capacity capacitor 500: Unit capacitor 60: Unit discharge switching element 70: Main discharge switching element 80 : Output section 90 : Control unit 100 : Emergency discharge switch 110: Discharge resistor

Claims

Claim 1 A pulse power control device comprising: a power supply unit that converts and transmits an external commercial power source into DC; a main charging switching element connected to the power supply unit; n (where n is a natural number) unit charging switching elements connected in parallel to the main charging switching element; a large-capacity capacitor connected to each of the unit charging switching elements; a unit discharge switching element connected to each of the large-capacity capacitors; a main discharge switching element connected in parallel to the unit discharge switching elements; an output unit connected to the main discharge switching element to transmit power to an electromagnetic pinning device; and a control unit that controls the switching times of the main charging switching element and the unit charging switching element, and the main discharge switching element and the unit discharge switching element, such that the amount of power output transmitted to the output unit becomes a combination of the charging and discharging amounts of 1 to n large-capacity capacitors; wherein the pulse power control device is characterized by converting the pulse output of a pulse power device. Claim 2 A pulse power control device according to claim 1, further comprising: an emergency discharge switch connected in parallel to the large-capacity capacitor; and a discharge resistor connected to the emergency discharge switch to attenuate and extinguish the power transmitted thereto, characterized in that the large-capacity capacitor is emergency discharged when it is difficult to output the charging power of the large-capacity capacitor to the output section. Claim 3 A pulse power control device characterized in that, in paragraph 2, the emergency discharge switch is configured as a physical switch so that a user can operate the discharge. Claim 4 A pulse power control device according to claim 1, characterized in that when the control unit inputs m as the number of unit capacitors to be used, it divides the large-capacity capacitor into unit capacitors and controls the charging and discharging of each unit capacitor alternately. Claim 5 A pulse power control device according to claim 1, characterized in that the control unit, upon inputting the required power amount of the output unit, calculates the required number of unit capacitor groups k (where k is a natural number less than or equal to n), divides the large-capacity capacitors into k unit capacitor groups, and controls the alternating charging and discharging for each unit capacitor group.

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