List-based multi-gear resistance load cabinet switching circuit design method and system

Abstract

The application discloses a multi-gear resistance load cabinet switching circuit design method and system based on a list method, and belongs to the electrical equipment field. The method comprises the following steps: determining the series-parallel connection form requirement of each gear of the resistance load cabinet and the resistance number of the resistance load cabinet; writing a table for representing the resistance connection relationship of the series-parallel connection form according to the series-parallel connection form with the largest resistance number; transforming the above table into a table for representing other series-parallel connection forms by increasing and reducing columns; and drawing a switching circuit according to the final table to complete the design. The method can realize the switching circuit design under the resistance uniform type, reduces the difficulty of the resistance non-inductive design, and is beneficial to the maintenance and replacement of the load cabinet. The method uses the table to design the switching circuit, is more intuitive and clear, uses less switches, and reduces the manufacturing cost of the resistance load cabinet.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment, and more specifically, to a design method and system for switching circuits of multi-stage resistor load cabinets based on a list method. Background Technology

[0002] In the field of Very Low Frequency (VLF) communication technology, adjustable resistive loads are commonly used to enhance the performance of analog antennas. Existing adjustable resistive loads mainly include three types: sliding adjustable resistive load boxes, AC electronic load boxes, and resistive load cabinets. Among these, the slip ring structure of sliding adjustable resistive load boxes is insufficient to meet the high power requirements of VLF communication, and the operating frequency of AC electronic load boxes cannot meet the frequency requirements of VLF communication. Resistive load cabinets, composed of relays and resistors, offer high rated power and wide bandwidth, and are widely used in VLF communication technology. In high-power resistive load cabinets, the standardized design of the resistors facilitates the maintenance and replacement of circuit modules, reducing costs. With a standardized resistor design, the design of the internal switching circuit of the resistive load cabinet becomes a key factor affecting the number of adjustable positions and manufacturing cost.

[0003] In existing technologies, the connection structure of the switching circuit for the resistive load cabinet is typically determined first—whether it should be series or parallel. Then, based on the adjustable range of the resistive load cabinet, appropriate resistor values ​​and quantities are selected to design the switching circuit. This design method is simple, but it often requires custom-made resistors with different resistance values ​​and power ratings, which is not conducive to the maintenance and replacement of the load cabinet and increases the difficulty of designing inductive resistors. If a series-parallel combination is used to design the switching circuit for the resistive load cabinet, it requires a long period of trial and error to meet the range requirements of the resistive load cabinet. In most cases, a large number of switches are used, increasing manufacturing costs. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a design method and system for switching circuits of multi-position resistor load cabinets based on the list method, which aims to overcome the shortcomings of the prior art, such as the large number of switches required, the difficulty of resistor type design, and the high manufacturing and maintenance costs of resistor load cabinets.

[0005] To achieve the above objectives, this invention provides a method for designing a multi-stage resistor load switch circuit based on a list method, comprising the following steps:

[0006] (1) Determine the series and parallel connection requirements for each position of the resistor load cabinet and the number of resistors in the resistor load cabinet.

[0007] (2) Based on the series-parallel connection form with the most resistors used, write a table showing the resistor connection relationship of the series-parallel connection form.

[0008] (3) By adding and removing columns, the table in step (2) is transformed into a table representing other serial and parallel forms.

[0009] (4) The columns added and removed in step (3) indicate that the marked resistor leads are connected by switches, and the columns that remain unchanged indicate that the resistor leads are always connected by wires; the added columns in the table indicate the switches that should be closed when the switching circuit achieves the corresponding series and parallel configuration, and the other switches should be open. Draw the switching circuit according to the final table in step (3), and the design is complete.

[0010] Furthermore, the number of resistors in the resistor load cabinet in step (1) is equal to the maximum number of resistors in all series and parallel configurations of the resistor load cabinet.

[0011] Further, in step (2), the first column of the table is the number of each resistor lead, in the form of "serial number +" and "serial number -". Different numbers are arranged in ascending or descending order, and numbers with the same number are arranged in the order of "serial number +" followed by "serial number -". The serial number is the resistor number. The columns other than the first column represent the wires connecting the resistor leads. If two leads are connected by a wire, the corresponding row of the two leads in a column is marked. A column can only represent the connection between two leads. Listing the connection relationship of the resistor leads is equivalent to listing the other columns.

[0012] The steps for creating a table are as follows:

[0013] (2.1) Select the first and last numbers in the first column of the table as the two input terminals of the resistor load cabinet.

[0014] (2.2) According to the series and parallel connection form to be represented, the resistors are grouped in the direction from the highest and lowest serial number to the middle serial number. Resistors in the same group are in parallel relationship, and resistors in different groups are in series relationship.

[0015] (2.3) List the connection relationship of the leads of resistors in the same group: In the same group of resistors, take one lead from each resistor to form one group, and the remaining leads to form another group. Connect the leads in the same group with wires.

[0016] (2.4) List the connection relationships of the leads between different groups of resistors in the direction from the lowest serial number resistor to the highest serial number resistor, and complete the table.

[0017] Furthermore, the writing rules for step (2.4) are as follows:

[0018] (2.4.1) Input terminals and terminals shorted to them must not be connected to the leads of other resistors by wires.

[0019] (2.4.2) The leads connecting the two groups of resistors and the terminals short-circuited with them shall not be connected to the leads of other groups of resistors by wires.

[0020] Furthermore, the specific steps of step (3) are as follows:

[0021] (3.1) Among the series and parallel forms that have not been shown, select the series and parallel form with the most resistors as the transformation target of the current table.

[0022] (3.2) Regroup the resistors according to step (2.2).

[0023] (3.3) Based on the current table, according to the new grouping results and following the writing method of step (2.2), write down the connection relationship of the leads of the resistors in the same group.

[0024] (3.4) Based on the new grouping results and following the writing rules of step (2.4), write the connection relationship between the leads of different groups of resistors in the direction from the lowest serial number resistor to the highest serial number resistor, and complete the rewriting of the table.

[0025] (3.5) Determine whether there are any unrepresented series-parallel combinations among all the required series-parallel combinations. If yes, proceed to step (3.1); otherwise, proceed to step (4).

[0026] Furthermore, steps (3.3) and (3.4) should follow the principle of minimizing the number of columns added or removed, and rewrite the current table.

[0027] Another aspect of the present invention provides a multi-stage resistor load cabinet switching circuit design system based on a list method, comprising: a computer-readable storage medium and a processor;

[0028] The computer-readable storage medium is used to store executable instructions;

[0029] The processor is used to read executable instructions stored in the computer-readable storage medium and execute the above-described multi-stage resistor load cabinet switching circuit design method based on the list method.

[0030] Compared to design methods that use series or parallel structures for the switching circuit of a resistor load cabinet, the method conceived in this invention enables the design of a switching circuit under a unified resistor configuration, reducing the difficulty of designing a resistor-free system and facilitating the maintenance and replacement of the load cabinet. Furthermore, compared to the trial-and-error method, this invention uses tables for switching circuit design, which is more intuitive and clear, requires fewer switches, and reduces the manufacturing cost of the resistor load cabinet. Attached Figure Description

[0031] Figure 1 This is a flowchart of a multi-stage resistor load cabinet switching circuit design method based on the list method provided in an embodiment of the present invention;

[0032] Figure 2(a) and Figure 2(b) are schematic diagrams illustrating the connection relationship of the leads of resistors in the same group and the connection relationship of leads of resistors in different groups in the 3 parallel and 4 series parallel configuration of the present invention, respectively.

[0033] Figure 3(a) is a schematic diagram of the grouping results of resistors in the 4 parallel and 3 series parallel configuration according to an embodiment of the present invention; Figure 3(b) and Figure 3(c) are schematic diagrams illustrating the connection relationship of the leads of resistors in the same group and the connection relationship of the leads of resistors in different groups in the 4 parallel and 3 series parallel configuration according to an embodiment of the present invention.

[0034] Figure 4(a) is a schematic diagram of the grouping results of resistors in the form of 5 parallel and 2 series parallel in an embodiment of the present invention; Figure 4(b) and Figure 4(c) are schematic diagrams of the connection relationship of the leads of resistors in the same group and the connection relationship of the leads of resistors in different groups in the form of 5 parallel and 2 series parallel in an embodiment of the present invention, respectively.

[0035] Figure 5 This is a schematic diagram of the switching circuit designed in an embodiment of the present invention. Detailed Implementation

[0036] 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.

[0037] In this embodiment, the resistor unit of the resistor load cabinet is uniformly designed to be 100Ω, and the switch is a normally open switch. The adjustable resistance value requirements and corresponding series and parallel connection requirements of the resistor load cabinet are shown in Table 1.

[0038] Table 1 Design Requirements for Resistive Load Cabinets

[0039] Adjustable resistance / Ω Series and parallel forms 131 3 in parallel 4 strings 75 4 in 3 strings 40 5 in 2 strings

[0040] This invention provides a method for designing switching circuits for multi-stage resistor load banks based on a list-based approach, such as... Figure 1 As shown, it includes:

[0041] (1) The series and parallel connection requirements for each position of the resistor load cabinet are: 3 parallel 4 series, 4 parallel 3 series and 5 parallel 2 series. The number of resistors in the resistor load cabinet is 12.

[0042] (2) Write a table showing the connection relationship of resistors in the form of 3 parallel and 4 series parallel.

[0043] (3) By adding and removing columns, the table in step (2) is transformed into a table representing other serial and parallel forms.

[0044] (4) The columns added and removed in step (3) represent the switches installed between the resistor leads. Columns that remain unchanged indicate that the resistor leads are always connected by wires. After step (3.4) is completed, the added columns in the table indicate the switches that should be closed when the switching circuit achieves the corresponding series-parallel configuration; the remaining switches should be open. Draw the switching circuit based on the final table from step (3), as follows: Figure 5 As shown, the design is complete.

[0045] Furthermore, the first column of the table in step (2) is the number of each resistor lead, and the "+" and "-" in the number are only used to distinguish the two leads of the same resistor. The other columns represent the wires connecting the resistor leads. If two leads are connected by a wire, then the corresponding row of the two leads in a column is filled with "1". A column can only represent the connection between two leads. The connection between multiple leads should be represented by multiple columns.

[0046] The steps for creating a table are as follows:

[0047] (2.1) Select the first number "1+" and the last number "12-" in the first column of the table as the two input terminals of the resistor load cabinet.

[0048] (2.2) Based on the 3-parallel and 4-series parallel configuration, the resistors are grouped from the highest and lowest serial numbers to the middle serial numbers. Resistors 1 to 3 are grouped together first, followed by resistors 12 to 10, and then resistors 4 to 6 and 9 to 7 are grouped together. Resistors in the same group are connected in parallel, while resistors in different groups are connected in series.

[0049] (2.3) List the connection relationship of the resistor leads in the same group. In order to make the table neat and clear, connect the leads with "+" in the number together and connect the leads with "-" in the number together, as shown in Figure 2(a).

[0050] (2.4) List the connection relationship between the leads of different groups of resistors in the direction from the lowest serial number resistor to the highest serial number resistor. In order to make the table neat and clear, connect the "3-" and "4+" terminals, the "6-" and "7+" terminals, and the "10+" and "9-" terminals to complete the table listing, as shown in Figure 2(b).

[0051] It should be noted that step (2) can also be used to write a table representing the parallel connection of 4 and 3 strings.

[0052] Furthermore, the specific steps of step (3) are as follows:

[0053] (3.1) Among the unrepresented series-parallel configurations, the 4-parallel-3-series-parallel configuration with the most resistors is selected as the transformation target for the current table.

[0054] (3.2) The resistors are regrouped as shown in Figure 3(a).

[0055] (3.3) Based on Figure 2(b), list the connection relationships of the leads of resistors in the same group, as shown in Figure 3(b). In the first group of resistors, since terminals “1-”, “2-”, “3-”, and “4+” are already connected to each other by wires, these four terminals are grouped together, and the remaining four terminals are grouped together. At this time, simply connect terminal “4-” to the previously connected terminals “1+”, “2+”, and “3+”. To make the table neat and clear, add a new column connecting “4-” and “3+”. The connection relationships of other groups of resistors are listed in the same way, and will not be repeated here.

[0056] (3.4) Based on the new grouping results, and building upon Figure 3(b), list the connection relationships between the leads of resistors in different groups, following the direction from the lowest-numbered resistor to the highest-numbered resistor, to complete the table rewriting, as shown in Figure 3(c). When listing the connection relationships between the leads of resistors in group 1 and group 2, since “4-” is already connected to the input terminal “1+”, according to the rule that “when listing the connection relationships between the leads of resistors in different groups, input terminals and terminals shorted to them cannot be connected to the leads of other resistors through wires,” the column representing the connection between “4-” and “5-” through wires should be deleted, i.e., column 4 in Figure 3(c) is reduced. At this time, resistors in group 1 and group 2 are connected in series through the wire connecting “4+” and “5+”. Similarly, since “9+” and “12-” are already connected, the column representing the connection between “9+” and “8+” through wires should be deleted, i.e., column 5 is reduced. Since "8-" and "5+" are connected at this point, according to the rule that "the leads connecting the two groups of resistors and the terminals short-circuited to them cannot be connected to the leads of other groups of resistors via wires," the second group of resistors cannot be connected to the third group of resistors via the wire connecting "8-" and "9-". Therefore, column 6, which represents the connection of "8-" and "9-" via wires, should be deleted. To connect the second and third groups of resistors, a column connecting "8+" and "9-" is added, i.e., column 7 is added. The table now represents a 4-parallel, 3-series, series-parallel configuration.

[0057] (3.5) Among all the required series-parallel configurations, the 5-parallel-2-series-parallel configuration is not shown. Therefore, the 5-parallel-2-series-parallel configuration is used as the transformation target of the table shown in Figure 3(c), and the resistors are regrouped as shown in Figure 4(a). Resistors 1 to 5 and 12 to 8 are preferentially grouped into one group each, and the remaining resistors 6 and 7 are not connected to the circuit.

[0058] (3.6) Based on Figure 3(c), list the connection relationship of the leads of the resistors in the same group, as shown in Figure 4(b). Divide the resistors in the first group into one group ("1-", "2-", "3-", "4+", and "5+"), and the remaining terminals into another group. Then, change column 4 (reduced) representing the connection of "4-" and "5-" to column 4 (added), so that resistors 1 to 5 can satisfy the parallel connection relationship among resistors in the same group. Similarly, divide the resistors in the second group into one group ("8-", "9-", "10+", "11+", and "12+"), and the remaining terminals into another group. Then, change column 6 (reduced) representing the connection of "9-" and "8-" and column 5 (reduced) representing the connection of "9+" and "8+" to columns 6 and 5 (added), respectively, and delete column 7 (added) representing the connection of "9-" and "8+", i.e., reduce column 7, so that resistors 12 to 8 can satisfy the parallel connection relationship among resistors in the same group.

[0059] (3.7) Based on Figure 4(b), list the connection relationships between the leads of different groups of resistors to complete the table rewriting, as shown in Figure 4(c). Since the input terminals “1+” and “12-” are connected through the connection relationships of “5-”, “6-”, “7+”, and “8+”, according to the listing rules in step (3.4), delete the columns representing the connection relationships of “5-” and “6-” and “7+” and “8+”, that is, reduce columns 8 and 9. At this time, the “6-” and “7+” terminals are not connected to any terminals, and the connection between “1+” and “12-” is broken. Since the first group of resistors and the second group of resistors are connected in series through the connection of the “5+”, “6+”, “7-”, and “8-” terminals, the table at this time represents the series-parallel form of 5 parallel and 2 series.

[0060] (3.8) All required series and parallel forms have been represented. Proceed to step (4).

[0061] The switching circuit designed in this invention uses a total of 12 resistors and 9 switches. The switching switch operation corresponding to each series and parallel configuration is shown in Table 2.

[0062] Table 2 Switch Operation Status

[0063] Series and parallel forms Action switch 3 in parallel 4 strings S2, S3, S5, S6, S8 4 in 3 strings S1, S3, S4, S5, S7, S9 5 in 2 strings S1, S2, S4, S6, S8, S9

[0064] To verify the correctness of the design method of this invention, the switching circuit designed in this invention was simulated and verified using Matlab simulation software. The total resistance value of the resistive load cabinet was used as the basis for verifying the correctness of the design method. The simulation results are shown in Table 3.

[0065] Table 3 Simulation Results

[0066]

[0067]

[0068] Simulation results show that the design method provided by this invention can meet the requirements of adjustable resistance value and series-parallel connection of the resistive load cabinet, indicating a successful design. Compared to design methods that design the switching circuit of the resistive load cabinet as a series or parallel structure, the design method provided by this invention realizes the switching circuit design under the resistive load cabinet, reducing the difficulty and cost of maintenance and replacement. Unlike the trial-and-error method, the design method provided by this invention is systematic, more intuitive and clear, uses fewer switches, and reduces costs.

[0069] 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 method for designing a switching circuit for a multi-stage resistor load bank based on a list method, characterized in that, Includes the following steps: (1) Determine the series and parallel connection requirements for each position of the resistor load cabinet and the number of resistors in the resistor load cabinet; (2) Based on the series-parallel connection form with the most resistors, write a table representing the resistor connection relationship of the series-parallel connection form; the first column of the table is the number of each resistor lead, the number is in the form of "serial number +" and "serial number -", the numbers of different serial numbers are arranged in ascending or descending order, and the numbers of the same serial number are arranged in the order of "serial number +" then "serial number -", the serial number is the resistor number; the other columns except the first column represent the wires connecting the resistor leads. If two leads are connected by a wire, then mark the corresponding row of the two leads in a column. A column can only represent the connection between two leads; writing the connection relationship of the resistor leads is equivalent to writing the other columns. (3) By adding and removing columns, the table in step (2) is transformed into a table representing other serial and parallel forms; (4) The columns added and removed in step (3) indicate that the marked resistor leads are connected by a switch, and the columns that have not been changed indicate that the resistor leads are always connected by wires; the added columns in the table indicate the switches that should be closed when the switching circuit realizes the corresponding series and parallel form, and the other switches should be in the open state; draw the switching circuit according to the final table in step (3), and the design is completed.

2. The method according to claim 1, characterized in that, The number of resistors in the resistor load cabinet in step (1) is equal to the maximum number of resistors in all series and parallel configurations of the resistor load cabinet.

3. The method according to claim 1, characterized in that, Step (2) specifically includes: (2.1) Select the first and last numbers in the first column of the table as the two input terminals of the resistor load cabinet; (2.2) According to the series and parallel connection form to be represented, the resistors are grouped in the direction from the highest and lowest serial number to the middle serial number. Resistors in the same group are in parallel relationship, and resistors in different groups are in series relationship. (2.3) List the connection relationship of the leads of resistors in the same group: In the same group of resistors, take one lead from each resistor to form one group, and the remaining leads to form another group. Connect the leads in the same group with wires. (2.4) List the connection relationships of the leads between different groups of resistors in the direction from the lowest serial number resistor to the highest serial number resistor, and complete the table.

4. The method according to claim 3, characterized in that, The writing rules for step (2.4) are as follows: (2.4.1) Input terminals and terminals shorted to them must not be connected to the leads of other resistors by wires; (2.4.2) The leads connecting the two groups of resistors and the terminals short-circuited with them shall not be connected to the leads of other groups of resistors by wires.

5. The method according to claim 3, characterized in that, The specific steps of step (3) are as follows: (3.1) Among the series and parallel forms that have not been shown, select the series and parallel form with the most resistors as the transformation target of the current table; (3.2) Regroup the resistors according to step (2.2); (3.3) Based on the current table, according to the new grouping results and following the writing method of step (2.2), write down the connection relationship of the leads of the resistors in the same group; (3.4) Based on the new grouping results and following the writing rules of step (2.4), write the connection relationship between the leads of different groups of resistors in the direction from the lowest serial number resistor to the highest serial number resistor, and complete the rewriting of the table; (3.5) Determine whether there are any unrepresented series and parallel forms among all the required series and parallel forms. If yes, execute step (3.1); otherwise, execute step (4).

6. The method according to claim 5, characterized in that, Steps (3.3) and (3.4) should follow the principle of minimizing the number of columns added or removed, and rewrite the current table.

7. A system for designing switching circuits for multi-stage resistor load cabinets based on a list method, characterized in that, include: Computer-readable storage media and processors; The computer-readable storage medium is used to store executable instructions; The processor is used to read executable instructions stored in the computer-readable storage medium and execute the multi-stage resistor load cabinet switching circuit design method based on the list method as described in any one of claims 1 to 6.

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