Design method of high repetition frequency pulse power supply

Abstract

The application discloses a design method of a high-repetition working frequency pulse power supply, belonging to the technical field of pulse power technology. The design method comprises the following steps: determining a load working condition, including the pulse current demand and the repetition working frequency of each load; designing a pulse inductor, calculating the equivalent working frequency and the thermal load of the pulse inductor according to the pulse current demand and the repetition working frequency of each load, and optimizing the pulse inductor to meet the temperature rise requirement; designing a thyristor, determining the highest repetition working frequency of a single thyristor, and determining the required number of thyristors for each load; and controlling the discharging time sequence, setting the discharging time sequence of each thyristor to meet the repetition working frequency demand of each load. The application can realize the repetition working frequency operation of the pulse power supply with multiple loads, improve the component utilization rate, reduce the volume of the pulse power supply, reduce the thermal load of a single thyristor through the time-sharing multiplexing of the thyristor, and improve the service life of the thyristor and the system reliability.

Description

Technical Field

[0001] This invention belongs to the field of pulse power technology, and more specifically, relates to a design method for a high repetition frequency pulse power supply. Background Technology

[0002] Pulsed power supplies are widely used in many fields such as national defense scientific research, high-tech research and civilian industry. They play an important role in technologies such as nuclear physics, accelerators, lasers and electromagnetic launches, and also have great potential in fields such as chemical engineering, environmental engineering and medicine.

[0003] A pulse power supply specifically comprises pulse capacitors, pulse inductors, thyristors, diodes, thyristor triggering and protection devices, and output cables. Existing pulse power supplies mostly employ a modular design, with each module being an independent power supply containing all the aforementioned components and capable of operating only a single load. However, in certain applications such as electromagnetic emission and pulse power rock breaking, the pulse power supply's charging and discharging can be completed within seconds, while load replacement requires a longer time. Using existing pulse power supplies, the utilization efficiency of components operating with a single power supply and a single load is low. Furthermore, as the repetitive operating frequency of the discharge load increases, the electrical and thermal loads on the pulse inductors and thyristors in the pulse power supply significantly increase, greatly increasing the risk of system failure. Summary of the Invention

[0004] In response to the deficiencies and improvement needs of existing technologies, this invention provides a design method for a high repetitive operating frequency pulse power supply, aiming to solve the technical problems of low component utilization efficiency when a single power supply operates with a single load, and high system failure risk as the repetitive operating frequency of the discharge load increases.

[0005] To achieve the above objectives, the present invention provides a design method for a high repetitive operating frequency pulse power supply, wherein the pulse power supply includes a pulse capacitor, a pulse inductor, and multiple thyristors, and the design method includes:

[0006] Determine the load conditions, including the pulse current requirements and repetitive operating frequency of each load;

[0007] The pulse inductor design involves calculating the equivalent operating frequency and thermal load of the pulse inductor based on the pulse current requirements and repetitive operating frequency of each load, and then optimizing the pulse inductor to meet the temperature rise requirements.

[0008] Thyristor design, determining the highest repetitive operating frequency f of a single thyristor. s The number of thyristors required to design the i-th load is N. i =f i / f s , where f iLet be the repetitive operating frequency of the i-th load, where i = 1, ..., n, and n is the total number of loads;

[0009] Discharge timing control: Set the discharge timing of each thyristor to meet the repetitive operating frequency requirements of each load.

[0010] Furthermore, the loads are discharged sequentially, and the interval between sequential discharges is greater than the charging time of the pulse capacitor.

[0011] Furthermore, the equivalent operating frequency of the pulse inductor is the sum of the repetitive operating frequencies of each load, and the thermal load of the pulse inductor is determined based on the resistance value of the pulse inductor and the pulse current demand value of each load.

[0012] Furthermore, the pulse inductor is a water-cooled inductor, and the temperature rise of the pulse inductor is controlled by adjusting the flow rate of the coolant.

[0013] Furthermore, the thyristor is formed by connecting a thyristor valve plate, a diode valve plate, a lead-out copper busbar, and an insulating pad in series. The lead-out copper busbar is connected to a pulse inductor or an output cable, and the insulating pad is used to insulate the thyristor valve plate and the diode valve plate to protect the thyristor valve plate, the diode valve plate, and the load.

[0014] Furthermore, the discharge timing control generates control signals according to the requirements of each load. For different loads, the thyristor is controlled to turn on to meet the repetitive working frequency requirements of the load. For the same load, the thyristor is controlled to turn on sequentially to achieve time-division multiplexing.

[0015] Furthermore, the low-voltage device in the discharge timing control adopts ferromagnetic material encapsulation, optical fiber transmission, external power supply isolation, and internal lithium battery power supply.

[0016] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0017] 1. This invention improves the existing pulse power supply topology and design. By controlling the turn-on and turn-off of the thyristors in a timing manner, it can enable one pulse power supply to operate with multiple loads, improve the component utilization rate of the pulse power supply, reduce the size of the pulse power supply, and increase the energy density of the pulse power supply.

[0018] 2. This invention uses water cooling technology to cool the pulse inductor and improve its thermal load capacity.

[0019] 3. This invention achieves time-division multiplexing of thyristors by simultaneously turning on multiple thyristors in sequence, thereby reducing the equivalent operating frequency of each thyristor and improving the service life of the thyristors and the reliability of the system.

[0020] 4. This invention enables multiple loads to operate at the same frequency using a single pulse power supply by time-division multiplexing of thyristors.

[0021] 5. This invention further reduces the size of the device by pressing multiple thyristors and diodes together. Attached Figure Description

[0022] Figure 1 This is a design flowchart of a high repetitive operating frequency pulse power supply design method provided in an embodiment of the present invention.

[0023] Figure 2 The power supply topology diagram is provided for a design method of a high repetitive operating frequency pulse power supply according to an embodiment of the present invention.

[0024] Figure 3 A typical current waveform diagram of a design method for a high repetitive operating frequency pulse power supply provided in an embodiment of the present invention.

[0025] Figure 4 A schematic diagram of a water-cooled inductor provided for a design method of a high repetitive operating frequency pulse power supply according to an embodiment of the present invention.

[0026] Figure 5 The circuit diagram and timing control schematic diagram are provided for a design method of a high repetitive operating frequency pulse power supply according to an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0028] In this invention, the terms "first," "second," etc. (if present) in the invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] See Figure 1 , combined Figures 2 to 5 This invention provides a design method for a high repetitive operating frequency pulse power supply, which mainly includes the following steps:

[0030] Step 1: Determine the load conditions, including the pulse current requirements and repetitive operating frequency of each load.

[0031] In some optional embodiments, determining the load conditions mainly involves determining the pulse current requirements of the loads and the repetitive operating frequency of each load. Since the repetitive operating frequencies of each load may be different, let their repetitive operating frequencies be f1 to f n The pulse current requirements of each load are i1(t) to i n (t).

[0032] Step 2: Pulse inductor design. Based on the pulse current requirements and repetitive operating frequency of each load, calculate the equivalent operating frequency and thermal load of the pulse inductor, and optimize the pulse inductor to meet the temperature rise requirements.

[0033] In some alternative embodiments, since each load current needs to flow through the pulse inductor to achieve pulse inductor multiplexing, the equivalent operating frequency f of the pulse inductor is... L f is the sum of the repetitive operating frequencies of each load. L =f1+f2+··+f n The pulse inductor resistance value R L With pulse current i1(t) to i n (t) Calculate the pulse inductor heat load P L =[i1 2 (t)+i2 2 (t)+···+i n 2 (t)]*R L Then, based on the pulse inductor heat load P L Equivalent operating frequency f of pulse inductor L The temperature rise of the pulse inductor under this operating condition is calculated. Increased temperature leads to increased inherent resistance and overheating failure, preventing it from meeting discharge requirements. If the pulse inductor design does not meet the requirements, its structure is optimized until the temperature rise meets the design specifications.

[0034] Specifically, the pulse inductor adopts a water-cooled inductor design. As the load increases, the thermal load of the pulse inductor increases. By using a water-cooled inductor, the temperature rise of the pulse inductor can be controlled by the flow rate of the coolant, simplifying the optimization process.

[0035] Preferably, in one specific embodiment, the pulse inductor adopts a hollow solenoid structure, such as... Figure 4 As shown. Its inner diameter is 5.5mm, outer diameter is 13.5mm, number of turns is 20, helix radius is 120mm, pitch is 22mm, inductance is 30μH, resistance is 2mΩ, deionized water is used as coolant, and when the flow rate is 4L.min, the temperature rise of a single discharge can return to the initial temperature when the next operating point arrives.

[0036] Step 3: Thyristor design, determining the highest repetitive operating frequency f of a single thyristor. s The number of thyristors required to design the i-th load is N. i =f i / f s , where f i Let be the repetitive operating frequency of the i-th load, where i = 1, ..., n, and n is the total number of loads.

[0037] In some alternative embodiments, since thyristors are often purchased from manufacturers, their electrical and thermal loads are difficult to optimize during application. Under a given pulse current intensity, the upper limit of the safe operating frequency of the thyristor is fixed. Therefore, the heat load and temperature rise under this current condition are calculated based on the thyristor parameters. The process of obtaining the thyristor heat load is as follows: based on the discharge current i(t), the thyristor voltage waveform u(t) is calculated using the thyristor volt-ampere characteristic U=A+B×I+C×ln(I+1)+D×√I; the thyristor heat load is calculated using p(t=u(t)×i(t), thus determining the maximum repetitive operating frequency f of the thyristor. s Based on the repetitive operating frequency f of the i-th load. i The number of thyristors required to design the i-th load is N. i =f i / f s Where i = 1, ..., n, each thyristor is turned on in turn to realize time-division multiplexing of thyristors, reduce the equivalent operating frequency of each thyristor, ensure that each thyristor works within the highest operating frequency, avoid thyristor thermal failure, and improve the service life of thyristors.

[0038] Specifically, the thyristor comprises a thyristor valve, a diode valve, a lead-out copper busbar, and an insulating pad connected in series and crimped together. The lead-out copper busbar is connected to a pulse inductor or output cable. The insulating pad is used to insulate the thyristor valve and diode valve to protect them from the load. Preferably, in one specific embodiment, the thyristor is a T408 model thyristor and its diode manufactured by CRRC Zhuzhou Electric Locomotive Research Co., Ltd., and the insulating pad is made of epoxy resin with a thickness of 10mm. The crimping pressure is 90kN. Under this condition, the highest repetitive operating frequency of the thyristor is 0.14Hz. To ensure the repetitive operating frequency of the load discharge, two thyristors are used to discharge sequentially for each load. The equivalent discharge frequency of a single thyristor is 0.1Hz, which meets the design requirements.

[0039] Step 4: Discharge timing control. Set the discharge timing of each thyristor to meet the repetitive operating frequency requirements of each load.

[0040] In some optional embodiments, timing control generates control signals based on the repetitive operating frequency of the discharge load. The control signals are divided into load discharge signals for thyristors between different loads and time-division multiplexing signals for thyristors within the same load. For different loads, the thyristors are controlled to turn on to meet the repetitive operating frequency requirements of the load. For the same load, the thyristors are controlled to turn on sequentially to achieve time-division multiplexing.

[0041] Specifically, the weak current device in the discharge timing control adopts anti-electromagnetic interference measures such as ferromagnetic material encapsulation, optical fiber transmission, external power supply isolation, and internal lithium battery power supply to avoid damage to the weak current device and thyristor mis-conduction caused by electromagnetic interference during strong pulse discharge.

[0042] Preferably, in a specific implementation example, for a 0.2Hz alternating discharge load, each load uses two thyristors to discharge sequentially, and the circuit diagram and discharge timing are as follows: Figure 5 As shown, thyristors S1-S4 are turned on sequentially in one discharge cycle, with a turn-on time interval of 2.5s. One discharge cycle is 10s, the discharge frequency of a single thyristor is 0.1s, the time interval of pulse power current flowing through each load is 5s, and the discharge frequency is 0.2Hz, which meets the design requirements.

[0043] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A design method for a high repetitive operating frequency pulse power supply, characterized in that, The pulse power supply includes a pulse capacitor, a pulse inductor, and multiple thyristors. The design method includes: Determine the load conditions, including the pulse current requirements and repetitive operating frequency of each load; The pulse inductor design involves calculating the equivalent operating frequency and thermal load of the pulse inductor based on the pulse current requirements and repetitive operating frequency of each load, and then optimizing the pulse inductor to meet the temperature rise requirements. Thyristor design, determining the highest repetitive operating frequency of a single thyristor. f s Design No. i The number of thyristors required for each load is: N i = f i / f s ,in, f i For the first i The repetitive operating frequency of the load. i =1、…、 n , n Total load; Discharge timing control: Set the discharge timing of each thyristor to meet the repetitive operating frequency requirements of each load. The pulse inductor is a water-cooled inductor, and its temperature rise is controlled by adjusting the coolant flow rate. The thyristor is composed of a thyristor valve plate, a diode valve plate, a copper busbar, and an insulating pad connected in series and pressed together. The copper busbar is connected to the pulse inductor or the output cable. The insulating pad is used to insulate the thyristor valve plate and the diode valve plate to protect them from the load. The discharge timing control generates control signals according to the requirements of each load. For different loads, the thyristor is controlled to conduct to meet the repetitive working frequency requirements of the load. For the same load, the thyristor is controlled to conduct sequentially to achieve time-division multiplexing.

2. The design method for a high repetitive operating frequency pulse power supply according to claim 1, characterized in that, The loads are discharged sequentially, and the interval between sequential discharges is greater than the charging time of the pulse capacitor.

3. The design method for a high repetitive operating frequency pulse power supply according to claim 1, characterized in that, The equivalent operating frequency of the pulse inductor is the sum of the repetitive operating frequencies of each load, and the thermal load of the pulse inductor is determined based on the resistance value of the pulse inductor and the pulse current requirements of each load.

4. The design method for a high repetitive operating frequency pulse power supply according to claim 1, characterized in that, The low-voltage device in the discharge timing control adopts ferromagnetic material encapsulation, optical fiber transmission, external power supply isolation, and internal lithium battery power supply.

Images