阅读说明：本技术 细化凝固组织用陡前沿方波脉冲磁场电源及其控制方法 (Steep front square wave pulse magnetic field power supply for thinning solidified tissue and control method thereof ) 是由 王洪国 于 2019-11-06 设计创作，主要内容包括：本发明涉及一种细化凝固组织用陡前沿方波脉冲磁场电源及其控制方法,所述磁场电源与磁场线圈连接,包括人机接口及主控模块、信号发生电路、主功率脉冲电源、陡化前沿脉冲电源和双电源连接装置,所述主功率脉冲电源的信号输入端和陡化前沿脉冲电源的信号输入端均分别连接人机接口及主控模块和信号发生电路,所述双电源连接装置分别连接主功率脉冲电源的信号输出端、陡化前沿脉冲电源的信号输出端、人机接口及主控模块和信号发生电路。与现有技术相比,本发明具有结构简单,方便调节,适用于金属及金属基复合材料细化凝固组织的脉冲磁场及脉冲磁滞振荡凝固磁场等优点。(The invention relates to a steep front square wave pulse magnetic field power supply for refining a coagulated tissue and a control method thereof, wherein the magnetic field power supply is connected with a magnetic field coil and comprises a human-computer interface, a main control module, a signal generating circuit, a main power pulse power supply, a steep front pulse power supply and a dual-power-supply connecting device, the signal input end of the main power pulse power supply and the signal input end of the steep front pulse power supply are respectively connected with the human-computer interface, the main control module and the signal generating circuit, and the dual-power-supply connecting device is respectively connected with the signal output end of the main power pulse power supply, the signal output end of the steep front pulse power supply, the human-computer interface, the main. Compared with the prior art, the invention has the advantages of simple structure, convenient adjustment, suitability for the pulse magnetic field and the pulse magnetic hysteresis oscillation solidification magnetic field of the refined solidification structure of the metal and the metal matrix composite material, and the like.)

1. A steep front square wave pulse magnetic field power supply for thinning a coagulated tissue is connected with a magnetic field coil (12), and is characterized by comprising a man-machine interface and main control module (1), a signal generating circuit (2), a main power pulse power supply (3), a steep front pulse power supply (4) and a dual-power supply connecting device (11), wherein the signal input end of the main power pulse power supply (3) and the signal input end of the steep front pulse power supply (4) are respectively connected with the man-machine interface and main control module (1) and the signal generating circuit (2), and the dual-power supply connecting device (10) is respectively connected with the signal output end of the main power pulse power supply (3), the signal output end of the steep front pulse power supply (4), the man-machine interface and main control module (1) and the signal generating circuit (2);

in the process of generating the set steep front-edge square wave pulse, the man-machine interface and main control module (1) controls the working states of the main power pulse power supply (3) and the steep front-edge pulse power supply (4), and the signal generating circuit (2) generates a time sequence for controlling the pulse forming of the main power pulse power supply (3) and the steep front-edge pulse power supply (4).

2. The power supply with the steep-front square-wave pulse magnetic field for refining the coagulated tissue according to claim 1, characterized in that the main power pulse power supply (3) and the steepening front pulse power supply (4) are both constructed based on the pulse power technology of capacitive energy storage.

3. The steep-front square-wave pulse magnetic field power supply for refining coagulated tissues according to claim 1, wherein the main power pulse power supply (3) comprises a first charging power supply (5), a first energy storage capacitor bank (6) and a first pulse forming circuit (7) which are connected in sequence, the first charging power supply (5) is connected with a human-computer interface and main control module (1), and the first pulse forming circuit (7) is respectively connected with a signal generating circuit (2) and a double power supply connecting device (11).

4. The steep-front square-wave pulse magnetic field power supply for refining coagulated tissues according to claim 3, characterized in that the first charging power supply (5) is a power supply with individually adjustable voltage and current, the adjustable voltage range is 2-1000V, and the adjustable current range is 50-10000A.

5. The steep-front square-wave pulse magnetic field power supply for refining the coagulated tissue according to claim 3, characterized in that the first energy storage capacitor bank (6) is formed by connecting a plurality of electrolytic capacitors in parallel and has a withstand voltage value of 60-100V.

6. The steep front square wave pulse magnetic field power supply for refining coagulated tissue according to claim 1, characterized in that the steep front pulse power supply (4) comprises a second charging power supply (8), a second energy storage capacitor bank (9) and a second pulse shaping circuit (10) which are connected in sequence, the second charging power supply (8) is connected with the human-computer interface and main control module (1), and the second pulse shaping circuit (10) is respectively connected with the signal generating circuit (2) and the dual power supply connecting device (11).

7. The power supply with the steep-front square-wave pulse magnetic field for refining the coagulated tissue as claimed in claim 6, wherein the second charging power supply (5) is a voltage-adjustable power supply with a voltage-adjustable range of 200-10000V.

8. The steep-front square-wave pulse magnetic field power supply for refining the coagulated tissue as defined in claim 6, wherein the second energy-storage capacitor bank (9) is formed by connecting a plurality of electrolytic capacitors in parallel, and has a voltage withstanding value of 1200-2500V.

9. A method for controlling a steep-front square-wave pulse magnetic field power supply for refining coagulated tissue as defined in claim 1, characterized in that the main power pulse power supply (3) and the steep-front pulse power supply (4) are controlled to operate simultaneously at the pulse front, and the main power pulse power supply (3) is controlled to operate alone to the pulse off at the plateau region.

10. The control method as claimed in claim 9, wherein the control method controls the power supply to output pulse frequency at 0-5KHz, duty ratio at 0.1-30%, current at 200-30000A, voltage at 2-1000V, and pulse front edge time at 1 μ s-1 ms.

Technical Field

The invention belongs to the technology of metal material preparation and treatment, relates to a pulsed magnetic field power supply in metal and metal matrix composite material treatment, and particularly relates to a steep-front square wave pulsed magnetic field power supply for refining a solidification structure and a control method thereof.

Background

Since compositional non-uniformity inevitably occurs during the solidification of the metal. This compositional non-uniformity is further exacerbated by forced cooling during the casting process, which affects the quality and performance of the final product. Research and production practice shows that thinning the solidification structure is an effective means for solving the problem of component nonuniformity.

At present, methods for refining coagulated tissues mainly include physical methods and chemical methods. The physical methods mainly include mechanical stirring, ultrasonic treatment, electromagnetic stirring, and the like. The pulse current is led into the coil to induce the pulse magnetic field, the pulse magnetic field has good refining effect, particularly, the pulse magnetic oscillation technology well solves various problems of melt splashing, non-compact solidified samples, inclusion of impurities and gas and the like caused by the introduction of the magnetic field, and the pulse magnetic oscillation technology becomes a research hotspot in the solidification structure refining technology. The pulse magnetic field is expected to become a solidification structure refining and homogenizing technology widely applied in the metallurgical industry due to low energy consumption, convenient application and remarkable fine grain effect. However, the load characteristic of the pulse magnetic field is 5-200 muH large inductance, and a steep-front square wave pulse magnetic field power supply which can adapt to the working state and has a simple structure is not available at present.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an adjustable steep-front square wave pulse magnetic field power supply for a metal and metal matrix composite material refined solidification structure and a control method thereof.

The purpose of the invention can be realized by the following technical scheme:

a steep front square wave pulse magnetic field power supply for thinning a coagulated tissue is connected with a magnetic field coil and comprises a human-computer interface, a main control module, a signal generating circuit, a main power pulse power supply, a steep front pulse power supply and a double-power-supply connecting device, wherein the signal input end of the main power pulse power supply and the signal input end of the steep front pulse power supply are respectively connected with the human-computer interface, the main control module and the signal generating circuit, and the double-power-supply connecting device is respectively connected with the signal output end of the main power pulse power supply, the signal output end of the steep front pulse power supply, the human-computer interface, the main control module and the signal generating;

in the process of generating the set steep front-edge square wave pulse, the man-machine interface and the main control module control the working states of the main power pulse power supply and the steep front-edge pulse power supply, and the signal generating circuit generates a time sequence for controlling the pulse forming of the main power pulse power supply and the steep front-edge pulse power supply.

Further, the main power pulse power supply and the sharpening leading edge pulse power supply are both constructed based on a pulse power technology of capacitive energy storage.

Furthermore, the main power pulse power supply comprises a first charging power supply, a first energy storage capacitor bank and a first pulse forming circuit which are sequentially connected, the first charging power supply is connected with the human-computer interface and the main control module, and the first pulse forming circuit is respectively connected with the signal generating circuit and the dual-power-supply connecting device.

Furthermore, the first charging power supply is a power supply with independently adjustable voltage and current, the adjustable range of the voltage is 2-1000V, and the adjustable range of the current is 50-10000A.

Furthermore, the first energy storage capacitor group is formed by connecting a plurality of electrolytic capacitors in parallel, and the withstand voltage value is 60-100V.

Furthermore, sharpening leading-edge pulse power supply includes second charging source, second energy storage capacitor group and the second pulse shaping circuit that connects gradually, second charging source is connected with human-computer interface and host system, second pulse shaping circuit connects signal generation circuit and dual supply connecting device respectively.

Further, the second charging power supply is a voltage-adjustable power supply, and the voltage-adjustable range is 200-10000V.

Furthermore, the second energy storage capacitor group is formed by connecting a plurality of electrolytic capacitors in parallel, and the withstand voltage value is 1200-2500V.

The invention also provides a control method of the steep-front square wave pulse magnetic field power supply for thinning the solidification structure, wherein the main power pulse power supply and the steep-front pulse power supply are controlled to work simultaneously at the pulse front, and the main power pulse power supply is controlled to work independently until the pulse is cut off at the flat top area.

Furthermore, the control method controls the pulse frequency of the power supply to be 0-5KHz, the duty ratio to be 0.1-30%, the current to be 200-30000A, the voltage to be 2-1000V and the pulse leading edge time to be 1 mus-1 ms.

Compared with the prior art, the invention has the following beneficial effects:

1) the pulse shaping device has the advantages of simple structure and convenient use, and the voltage, the current, the frequency, the duty ratio and the leading edge time of the output power supply can be adjusted by controlling the pulse shaping of the main power pulse power supply and the steepening leading edge pulse power supply.

2) The power supply of the invention has the output pulse frequency of 0-5KHz and is adjustable, the duty ratio of 0.1-30% and is adjustable, the current of 200-30000A and the voltage of 2-1000V and the pulse front time of 1 mus-1 ms and is adjustable, thus being very suitable for generating the pulse magnetic field and the pulse magnetic hysteresis oscillation solidification magnetic field of the refined solidification structure of the metal and the metal matrix composite.

3) In the power output process, the invention can read the return value and compare with the set value to form a feedback signal, and automatically adjust the control instruction and the time sequence to ensure that the output pulse value and the set value tend to be consistent.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic diagram of a signal generator;

FIG. 3 is a schematic structural diagram of a dual power connection device according to the present invention;

FIG. 4 is a control flow chart of embodiment 2 of the present invention;

reference numbers in fig. 1: the device comprises a human-computer interface and main control module, a signal generating circuit, a main power pulse power supply, a 4-sharpening front edge pulse power supply, a first charging power supply, a first energy storage capacitor bank, a first pulse forming circuit, a second charging power supply, a second energy storage capacitor bank, a second pulse forming circuit, a double power supply connecting device and a magnetic field coil, wherein the first charging power supply is 5, the second charging power supply is 6, the first energy storage capacitor bank is 7, the second pulse forming circuit is 8, the second charging power supply is 9, the second energy storage capacitor bank is 10, the.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.