Modulation circuit for discrete gear switching of controllable phase shifter and its acquisition method and terminal

Abstract

The present invention discloses a modulation circuit for discrete gear switching of a controllable phase shifter, a method for obtaining the same, and a terminal. The method comprises: obtaining the correspondence between different gears of the controllable phase shifter and device control signals based on the characteristics of a power electronic device; each gear is simultaneously controlled by several independent device control signals; converting each gear from a decimal gear number to a binary gear number; listing a truth table corresponding to all binary gear numbers and all device control signals based on the correspondence between different binary gear numbers and device control signals; obtaining a corresponding logic function based on the truth table to construct a corresponding logic circuit; connecting the output of a conversion module to the input of the logic circuit to obtain a modulation circuit for discrete gears of the controllable phase shifter; the conversion module is used to convert any gear of the controllable phase shifter from a decimal gear number to a binary gear number. The modulation circuit acquisition method of the present invention has simple steps and improves the gear control effect of the modulation circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of trigger circuit design, and in particular to a modulation circuit for discrete gear switching of a controllable phase shifter, an acquisition method thereof, and a terminal. Background Art

[0002] In recent years, power electronics technology has developed rapidly. The control of power electronic devices such as thyristors and diodes features rapid on-off switching, and is applied in various fields, including rectifiers, inverter circuits, and flexible power transmission systems. In rectifier and inverter circuits, PWM (Pulse Width Modulation) technology is often used to control thyristors, enabling them to switch frequently to function. However, UPFCs (Unified Power Flow Controllers) involve power exchange, requiring the use of complex control algorithms to control the thyristors. Furthermore, phase shifters, which have similar functions to UPFCs, control the steady-state power flow and voltage level of transmission lines by injecting voltage into the transmission line. Their main difference from UPFCs is their discrete gear control characteristics.

[0003] Currently, phase shifters used domestically and internationally primarily utilize mechanically tapped phase shifters, primarily for regulating grid currents. Due to their slow regulation speed, the impact of dynamic regulation on the system is rarely considered. In the future, thyristors could replace mechanical taps to enable controllable phase shifters with fast gear switching capabilities, factoring this into dynamic regulation to improve system transient resilience. Prior to this, a transient model of the controllable phase shifter must be constructed and simulated to initially analyze its impact.

[0004] However, current research mainly analyzes the controllable phase shifter's control variable phase shift angle as a continuous quantity, and the existing simulation software only has a steady-state model of the phase shifter, which fails to reflect its discrete gear switching characteristics. Summary of the Invention

[0005] The object of the present invention is to provide a modulation circuit for discrete gear switching of a controllable phase shifter and a method and terminal for obtaining the same, so as to solve the problem in the prior art that the steady-state model of the controllable phase shifter fails to reflect its discrete gear switching characteristics.

[0006] To achieve the above-mentioned object, the present invention provides a method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter, comprising:

[0007] Obtaining a correspondence between different gears of a controllable phase shifter and a device control signal based on characteristics of the power electronic device; wherein each gear of the controllable phase shifter is simultaneously controlled by multiple independent power electronic devices, and each of the power electronic devices outputs a device control signal;

[0008] Converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number;

[0009] According to the correspondence between different binary gear numbers of the controllable phase shifter and the device control signals, a truth table corresponding to all the binary gear numbers of the controllable phase shifter and all the device control signals is listed;

[0010] Obtaining a corresponding logic function according to the truth table, and building a logic circuit according to the logic function;

[0011] The output end of the conversion module is connected to the input end of the logic circuit to obtain a modulation circuit for discrete gears of the controllable phase shifter; wherein the conversion module is used to convert any gear of the controllable phase shifter from a decimal gear number to a binary gear number.

[0012] In one embodiment, obtaining the correspondence between different gears of the controllable phase shifter and the device control signal according to the characteristics of the power electronic device includes:

[0013] According to the characteristics of the power electronic devices, the corresponding relationship between each gear position of the controllable phase shifter and the output states of several independent power electronic devices is obtained respectively;

[0014] Based on the correspondence between each gear position of the controllable phase shifter and the output states of several independent power electronic devices, the output state of each power electronic device is converted into a device control signal represented by 0 or 1, where 0 represents the output state of the power electronic device being in the off state and 1 represents the output state of the power electronic device being in the on state, so as to obtain the correspondence between different gear positions of the controllable phase shifter and the device control signals.

[0015] In one embodiment, before converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number, the acquisition method further includes:

[0016] Determining whether the controllable phase shifter has a negative decimal gear number;

[0017] If not, directly convert each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number;

[0018] If yes, all decimal gear numbers of the controllable phase shifter are added with a preset value so that all gears of the controllable phase shifter can be represented by positive integers, and then each gear of the controllable phase shifter is converted from the updated decimal gear number to a binary gear number.

[0019] In one embodiment, the step of adding a preset value to all decimal gear numbers of the controllable phase shifter so that all gear numbers of the controllable phase shifter can be represented by positive integers, and then converting each gear number of the controllable phase shifter from the updated decimal gear number to a binary gear number, comprises:

[0020] Assuming that the controllable phase shifter has a range from -x to x, first select a binary bit number y, where x and y are both positive integers, then:

[0021] 2 y ≥2×x;

[0022] 2 y-1 <2×x;

[0023] Add x+1 to all decimal gear position numbers of the controllable phase shifter and input them into the y-bit encoder so that all gear positions of the controllable phase shifter can be represented by positive integers;

[0024] Then, all updated decimal gear position numbers of the controllable phase shifter are encoded by an encoder, and the binary gear position numbers corresponding to the decimal gear position numbers are represented as A1A2…A y , where A1A2…A y is the output of the y-bit encoder.

[0025] In one embodiment, obtaining the corresponding logic function according to the truth table includes:

[0026] According to the truth table, expressions of several logic functions corresponding to the device control signals output by the several power electronic devices are obtained respectively, and the expressions are as follows:

[0027] F1=(a1A′1A'2…A' y )+(b1A1A'2…A' y )+(c1A′1A2…A' y )+…+(l1A1A2…A y )

[0028] …

[0029] F i =(a i A′1A'2…A' y )+(b i A1A'2…A' y )+(c i A′1A2…A' y )+…+(l i A1A2…A y )

[0030] …

[0031] F Z =(a Z A′1A'2…A' y )+(b Z A1A'2…A' y )+(c Z A′1A2…A' y )+…+(l Z A1A2…A y );

[0032] Where A1A2…A y It is the binary gear number, F1, F2, F3, ... F z They represent the device control signal of a certain power electronic device, Z is the number of power electronic devices; a i ,b i ,c i …,l i They are the device control signals F i The function characteristic value of is represented by 0 or 1 according to the truth table, l is the number of phase shifter gears; A'1, A'2, ..., A' y are binary input signals A1, A2, ..., A y The "not" operation output;

[0033] The expressions of several logic functions are simplified by a logic converter to obtain the simplest AND / OR form of the logic function of each device control signal.

[0034] In one embodiment, the step of constructing a logic circuit according to the logic function includes:

[0035] According to the simplest AND / OR expressions of several logic functions, corresponding different logic elements are selected to build a logic circuit.

[0036] In one embodiment, the power electronic devices are all discrete devices that can be controlled in different gears.

[0037] The present invention further provides a modulation circuit for discrete gear switching of a controllable phase shifter. The modulation circuit is obtained by the method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to any one of the above embodiments, comprising:

[0038] a conversion module, configured to convert any gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number;

[0039] A logic circuit is constructed according to the logic function corresponding to the truth table, wherein the truth table is listed by the correspondence between the different binary gear numbers of the controllable phase shifter and the device control signal, and the input end of the logic circuit is connected to the output end of the conversion module.

[0040] In one embodiment, the conversion module includes an encoder.

[0041] The present invention further provides a terminal, comprising: a controllable phase shifter and a modulation circuit for discrete gear switching of the controllable phase shifter as in any one of the above embodiments, wherein the modulation circuit is used to control switching of the discrete gears of the controllable phase shifter.

[0042] Compared to existing technologies, the present invention offers the following advantages: a simplified method for obtaining a modulation circuit, improved gear control, and the ability to rapidly switch the gears of a controllable phase shifter. Furthermore, this general modulation circuit design concept can also provide a reference for designing control signal modulation circuits for other power electronic switch-controlled devices with discrete gear switching characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 This is a flow chart of a method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter provided by an embodiment of the present invention;

[0045] Figure 2 1 is a flow chart of a method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter provided in another embodiment of the present invention;

[0046] Figure 3 1 is a flow chart of a method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter provided in another embodiment of the present invention;

[0047] Figure 4 14 is a schematic diagram of the structure of an encoder provided by one embodiment of the present invention, which converts the gear position T plus 14 into a binary gear position number;

[0048] Figure 5 1 is a schematic diagram of the topological structure of 12 signal modules provided in an embodiment of the present invention;

[0049] Figure 6 yes Figure 5Schematic diagram of the internal NAND gate logic circuit of the 12 signal modules provided in the embodiment;

[0050] Figure 7 yes Figure 5 A simplified logic circuit diagram of the embodiment;

[0051] Figure 8 It is a schematic structural diagram of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0053] It should be understood that the step numbers used herein are only for convenience of description and are not intended to limit the order in which the steps are to be executed.

[0054] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0055] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0056] The term "and / or" refers to and includes any and all possible combinations of one or more of the associated listed items.

[0057] Given the lack of engineering applications of controllable phase shifters controlled by thyristors, diodes, etc., in order to consider the impact of controllable phase shifters on system transients, a transient model with discrete gear switching characteristics is built for controllable phase shifters controlled by thyristors, diodes, etc. The most important part is to design the power electronic device control signal modulation circuit to achieve gear switching.

[0058] See also Figure 1 The embodiment of the present invention combines the characteristics of power electronic devices, such as thyristors and diodes, to provide a method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter for a gear control mechanism device, including the following steps:

[0059] S1. Obtaining a correspondence between different gears of a controllable phase shifter and a device control signal based on characteristics of a power electronic device; wherein each gear of the controllable phase shifter is simultaneously controlled by multiple independent power electronic devices, and each power electronic device outputs a device control signal;

[0060] S2, converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number;

[0061] S3. Listing a truth table corresponding to all the binary gear numbers of the controllable phase shifter and all the device control signals according to the corresponding relationship between the different binary gear numbers of the controllable phase shifter and the device control signals;

[0062] S4. Obtain a corresponding logic function according to the truth table, and build a logic circuit according to the logic function;

[0063] S5. Connect the output end of the conversion module to the input end of the logic circuit to obtain a modulation circuit for discrete gears of the controllable phase shifter; wherein the conversion module is used to convert any gear of the controllable phase shifter from a decimal gear number to a binary gear number.

[0064] In an embodiment of the present invention, the power electronic devices are all discrete devices that can be controlled in different gears, such as thyristors, diodes, and other fast-switching power electronic components. The device control signals corresponding to the different gears mean that when the phase shifter is in different gears, the internal circuit of the corresponding power electronic device can be controlled by multiple device control signals. That is, each gear of the power electronic device is simultaneously controlled by multiple device control signals.

[0065] Specifically, the embodiment of the present invention obtains different gears and several device control signals corresponding to each gear based on the characteristics of the rapid switching of power electronic devices and the characteristics of different device control signals corresponding to different discrete gears of the devices; then converts the gear numbers represented in decimal into gear numbers represented in binary; then uses the binary gear numbers as input and the several device control signals corresponding to each gear as output, lists a truth table, and derives a logic function based on the truth table, builds a logic circuit based on the logic function, and finally obtains a modulation circuit from the input gear to the output device control signal.

[0066] During the use of the modulation circuit, the required adjustment gear of the power electronic device is input at the input end of the conversion module. The conversion module can then convert the gear from a decimal gear number into a corresponding binary gear number, and then input the binary gear number into the logic circuit. The logic circuit then outputs a device control signal corresponding to the binary gear number, thereby facilitating the study of the discrete gear switching characteristics of the controllable phase shifter.

[0067] It should be noted that step S2 can be executed by the conversion module in this embodiment or by other modules with conversion functions.

[0068] Compared with the prior art, the method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter in the embodiment of the present invention has at least the following advantages:

[0069] The modulation circuit is simple to create, offers enhanced gear control, and can rapidly switch the gears of a controllable phase shifter. Furthermore, this general modulation circuit design approach can also provide a reference for designing control signal modulation circuits for other power electronic switch-controlled devices with discrete gear switching characteristics.

[0070] See also Figure 2 In one embodiment of the present invention, step S1 of obtaining the corresponding relationship between different gears of the controllable phase shifter and the device control signal according to the characteristics of the power electronic device includes the following steps:

[0071] S11. According to the characteristics of the power electronic devices, respectively obtain the corresponding relationship between each gear position of the controllable phase shifter and the output states of several independent power electronic devices.

[0072] In this embodiment, by consulting the literature and understanding the control characteristics of power electronic devices, it is known that the controlled object has several gears. For example, the gear display of the ±n-gear phase shifter includes -n, -(n+1), -(n+2), ..., 0, 1, 2, ..., n-2, n-1, n, a total of 2n+1 gears. At the same time, there are m power electronic devices to control the switching of the gears, where each power electronic device has an output state of on or off. Therefore, the 2n+1 gears correspond to a total of (2n+1)*m power electronic device output states.

[0073] S12. Based on the correspondence between each gear position of the controllable phase shifter and the output states of multiple independent power electronic devices, convert the output state of each power electronic device into a device control signal represented by 0 or 1, where 0 indicates that the power electronic device is in the off output state and 1 indicates that the power electronic device is in the on output state, to obtain the correspondence between the device control signal and the gear position of the controllable phase shifter.

[0074] In this embodiment, the 2n+1 gears correspond to a total of (2n+1)*m device control signals. The output state of each power electronic device in each gear is represented by 0 or 1, that is, the output of the modulation circuit (device control signal) is represented by 0 or 1, which facilitates the subsequent design of the logic circuit.

[0075] To better illustrate the inventive concept of the present invention, a specific modulation circuit for discrete gear switching of a controllable phase shifter is designed and applied to control a controllable phase shifter with ±13 gears as a detailed embodiment.

[0076] First, by consulting the literature to understand the control characteristics of the power electronic devices involved in gear switching, we learned that the ±13-gear controllable phase shifter has 27 gear positions: -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13. Twelve thyristor control signals are used to control gear switching. The thyristor output states corresponding to the 12 thyristors and 27 gear positions are shown in Table 1 below.

[0077] Table 1: Position T and corresponding thyristor output status

[0078]

[0079]

[0080]

[0081] In the subsequent analysis process, the 27 gear numbers can be used as the input of the modulation circuit, and the 27 different thyristor control signals for each thyristor can be used as the output of the modulation circuit.

[0082] The thyristor control signal output by each thyristor is set to 0 or 1, where 0 indicates that the thyristor is turned off and 1 indicates that the thyristor is turned on, as shown in Table 2.

[0083] Table 2 Gear position T and corresponding thyristor control signal

[0084]

[0085]

[0086] See also Figure 3 In one embodiment of the present invention, before converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number in step S2, the acquisition method further includes the following steps:

[0087] S6. Determine whether the controllable phase shifter has a negative decimal gear position number.

[0088] If not, directly convert each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number.

[0089] If yes, all decimal gear numbers of the controllable phase shifter are added with a preset value so that all gears of the controllable phase shifter can be represented by positive integers, and then each gear of the controllable phase shifter is converted from the updated decimal gear number to a binary gear number.

[0090] In an embodiment of the present invention, since the decimal gear position of the controllable phase shifter may have a negative gear position, that is, the decimal gear position number of the power electronic device may be a negative value, and the negative gear position is not convenient for converting its decimal gear position number into a binary gear position number, therefore, before the decimal-to-binary conversion step S2, the embodiment of the present invention needs to determine whether the decimal gear position of the power electronic device has a negative gear position. If not, step S2 is directly executed. If so, the negative gear position needs to be corrected to a positive gear position, wherein, according to the range from the decimal negative gear position to the positive gear position of the controllable phase shifter, it can be regarded as a positive gear position from 0 to 2 times.

[0091] In a specific embodiment of the present invention, all decimal gear position numbers of the controllable phase shifter are added with a preset value so that all gear positions of the controllable phase shifter can be represented by positive integers, and then each gear position of the controllable phase shifter is converted from the updated decimal gear position number to a binary gear position number, including the following steps:

[0092] Assuming that the controllable phase shifter has a range from -x to x, first select a binary bit number y, where x and y are both positive integers, then:

[0093] 2 y ≥2×x;

[0094] 2 y-1 <2×x;

[0095] Add x+1 to all decimal gear position numbers of the controllable phase shifter and input them into the y-bit encoder so that all gear positions of the controllable phase shifter can be represented by positive integers;

[0096] Then, all updated decimal gear position numbers of the controllable phase shifter are encoded by an encoder, and the binary gear position numbers corresponding to the decimal gear position numbers are represented as A1A2…A y , where A1A2…A y is the output of the y-bit encoder.

[0097] In the embodiment of the present invention, the correspondence between the decimal gear position T and the binary gear position number of the power electronic device is shown in Table 3 below:

[0098] Table 3 Decimal gear position T and corresponding binary gear position numbers

[0099]

[0100]

[0101] In Table 3, the gear numbers represented by binary are A1, A2, ..., A y The device control signals are represented by F1, F2, F3, ... F z , where Z is the number of power electronic devices, and F1, F2, F3 to F z They respectively represent the device control signals of a certain power electronic device.

[0102] According to the above list of all binary gear numbers and all device control signals corresponding truth table, as shown in Table 4 below:

[0103] Table 4 Corresponding truth table of binary gear numbers and Z device control signals

[0104]

[0105] The present invention continues to take the above-mentioned ±13-position controllable phase shifter as an example. The encoder with 27 position numbers needs to select a 5-digit encoder. Add 14 to the decimal position T and input it into the encoder. The output of the encoder is the binary position number from 1 to 27, as shown in Table 5. The structure of the encoder is as follows Figure 4 shown.

[0106] Table 5 Gear position T and corresponding binary gear position numbers

[0107]

[0108]

[0109] Then the corresponding truth tables of all binary gear numbers and all thyristor control signals are listed, as shown in Table 6.

[0110] Table 6 Corresponding truth table of gear position T and thyristor control signal

[0111]

[0112]

[0113] In a specific embodiment of the present invention, the step S4 obtains the corresponding logic function according to the truth table, including the following steps:

[0114] According to the truth table, expressions of several logic functions corresponding to the device control signals output by the several power electronic devices are obtained respectively, and the expressions are as follows:

[0115] F1=(a1A′1A'2…A' y)+(b1A1A'2…A' y )+(c1A′1A2…A' y )+…+(l1A1A2…A y )

[0116] …

[0117] F i =(a i A′1A'2…A' y )+(b i A1A'2…A' y )+(c i A′1A2…A' y )+…+(l i A1A2…A y )

[0118] …

[0119] F Z =(a Z A′1A'2…A' y )+(b Z A1A'2…A' y )+(c Z A′1A2…A' y )+…+(l Z A1A2…A y );

[0120] Where A1A2…A y It is the binary gear number, F1, F2, F3, ... F z They represent the device control signal of a certain power electronic device, Z is the number of power electronic devices; a i ,b i ,c i …,l i They are the device control signals F i The function characteristic value of is represented by 0 or 1 according to the truth table, l is the number of phase shifter gears; A'1, A'2, ..., A' y are binary input signals A1, A2, ..., A y The "not" operation output;

[0121] The expressions of several logic functions are simplified by a logic converter to obtain the simplest AND / OR form of the logic function of each device control signal.

[0122] In an embodiment of the present invention, a truth table is used in combination with a logic conversion element in Multisim software to obtain a logic function expression (Sum of Product type or Product of Sum type) corresponding to the input and output.

[0123] Specifically, given a truth table and a total of Z device control signals, Z logic functions are expressed in the form of SOP, and correspond to Z device control signals respectively. The expressions are as follows:

[0124] F1=(a1A′1A'2…A' y )+(b1A1A'2…A' y )+(c1A′1A2…A' y )+…+(l1A1A2…A y )

[0125] …

[0126] F i =(a i A′1A'2…A' y )+(b i A1A'2…A' y )+(c i A′1A2…A' y )+…+(l i A1A2…A y )

[0127] …

[0128] F Z =(a Z A′1A'2…A' y )+(b Z A1A'2…A' y )+(c Z A′1A2…A' y )+…+(l Z A1A2…A y )

[0129] Where a i ,b i ,c i …,l i They are the device control signals F i The function characteristic value of is represented by 0 or 1 according to the truth table, l is the number of phase shifter gears; A'1, A'2, ..., A' y are binary input signals A1, A2, ..., A y The "not" operation output.

[0130] After obtaining the expressions of Z logic functions, the above expressions are simplified using Multisim's logic converter to obtain the simplest AND / OR form of the logic function of each device control signal.

[0131] The present invention continues to take the above-mentioned ±13-position controllable phase shifter as an example, uses the truth table in Table 6 to obtain the logic functions corresponding to the input and output, and writes the SOP formulas (sum of product) of the 12 thyristor control signals respectively. The SOP formulas of these 12 thyristor control signals are:

[0132] F1=A′1A'2A′3A4+A'2A3A'4A5+A′1A2A′3A'4+A′1A3A4A'5+A1 A'2A'4A5+A1 A3A'4+A1 A3A5

[0133] +A2A'4A′5+A1 A3'A4A5'+A2A4A5

[0134] F2=A'1A'2A'4+A'1A'3A'5+A'1A2A'3A4+A'1A3A'4A5+A'2A'3A'4+A1 A'2A'3A5+A1 A3A'5+A'2A3A4A5

[0135] +A1 A′3A'4A5+A2A4A′5

[0136] F3=A'1A'2A'3A'4+A'1A'2A'4A'5+A'1A'2A3A4A5+A'1A2A'3A4A'5+A2A3A'4A5+A'2A'3A'4A'5

[0137] +A1 A'2A′3A4A5+A1A3A4A′5+A1 A2A'4A5

[0138] F4=A′1A'2A′3A4A5+A′1A'2A3A4A′5+A′1A2A′3A'4A5+A2A3A'4A'5+A2A3A4A5+A1 A'2A′3A4A′5

[0139] +A1 A3A'4A5+A1 A2A'4A′5+A1 A2A4A5

[0140] F5=A′1A′2A3+A2A′3A′4+A′1A3A5+A1 A′3A′4+A1A′3A′5+A1 A2+A3A4

[0141] F6=A′1A'2A′3+A′1A′3A4+A2A3+A3A'4+A3A′5+A1 A'2A4A5+A1 A2A'4A'5

[0142] F7=A'1A'2A'3+A'1A'3A4+A2A3A'4A'5+A'2A'3A4A5+A1 A3A'4

[0143] F8=A′1A'2A3A4A5+A′1A2A′3A'4+A1 A'2A′3A'4+A1 A′3A4A5'+A1 A2A5

[0144] F9=A2A3+A2A4+A1

[0145] F 10 =A'1+A'2A'3A'4+A'2A'3A'5

[0146] F 11 =A′1A′2+A′1A′3A′4

[0147] F 12 =A1 A4A5+A1 A3+A1A2

[0148] In a specific embodiment of the present invention, the step S4 of building a logic circuit according to the logic function includes the following steps:

[0149] According to the simplest AND / OR expressions of several logic functions, corresponding different logic elements are selected to build a logic circuit.

[0150] The present invention continues to take the above-mentioned ±13-position controllable phase shifter as an example, and builds 12 logic circuits constructed by NAND gates according to the SOP formula of the above-mentioned 12 thyristor control signals, which respectively correspond to the conversion of the binary position numbers and the thyristor control signals. The input and output structures of these 12 logic circuits are as follows: Figure 5 As shown, its internal structure is as follows Figure 6 (a)-(l), where Figure 6 (a), (d), (e), (g), (i), and (k) are the internal structure diagrams of the F1 signal module, F2 signal module, F3 signal module, F4 signal module, F5 signal module, and F6 signal module, respectively. Figure 6 (b), (c), (f), (h), (j), and (l) are F7 signal module, F8 signal module, F9 signal module, and F 10 Signal module, F 11 Signal module, F 12 The internal structure of the signal module. For the convenience of representation, Figure 5 The logic circuit is simply represented as Figure 7 The logic circuit model shown.

[0151] After building the logic circuit, Figure 4 The encoder shown and Figure 7 The simplified model of the logic circuit shown in the figure is connected to complete the modulation circuit of the final controllable phase shifter discrete gear switching, as shown in Figure 8 shown.

[0152] See also Figure 8 An embodiment of the present invention further provides a modulation circuit for discrete gear switching of a controllable phase shifter. The modulation circuit is obtained by the method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to any of the above embodiments, and specifically includes:

[0153] a conversion module, configured to convert any gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number;

[0154] A logic circuit is constructed according to the logic function corresponding to the truth table, wherein the truth table is listed by the correspondence between the different binary gear numbers of the controllable phase shifter and the device control signal, and the input end of the logic circuit is connected to the output end of the conversion module.

[0155] The modulation circuit for discrete gear switching of the controllable phase shifter in an embodiment of the present invention is obtained by the acquisition method of the modulation circuit for discrete gear switching of the controllable phase shifter in any of the above embodiments, which can realize rapid switching of discrete gears of the controllable phase shifter and better gear control effect.

[0156] See also Figure 4 In a specific embodiment of the present invention, the conversion module includes an encoder.

[0157] See also Figure 8 A certain embodiment of the present invention further provides a terminal, comprising: a controllable phase shifter and a modulation circuit for discrete gear switching of the controllable phase shifter of any of the above embodiments, wherein the modulation circuit is used to control the switching of the discrete gears of the controllable phase shifter.

[0158] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter, characterized in that: include: Obtaining a correspondence between different gears of a controllable phase shifter and a device control signal based on characteristics of the power electronic device; wherein each gear of the controllable phase shifter is simultaneously controlled by multiple independent power electronic devices, and each of the power electronic devices outputs a device control signal; Converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number; According to the correspondence between each binary gear number of the controllable phase shifter and a plurality of the device control signals, a truth table corresponding to all the binary gear numbers of the controllable phase shifter and all the device control signals is listed; Obtaining a corresponding logic function according to the truth table, and building a logic circuit according to the logic function; The output end of the conversion module is connected to the input end of the logic circuit to obtain a modulation circuit for discrete gears of the controllable phase shifter; wherein the conversion module is used to convert any gear of the controllable phase shifter from a decimal gear number to a binary gear number.

2. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 1, characterized in that: The obtaining of the corresponding relationship between different gears of the controllable phase shifter and the device control signal according to the characteristics of the power electronic device includes: According to the characteristics of the power electronic devices, the corresponding relationship between each gear position of the controllable phase shifter and the output states of several independent power electronic devices is obtained respectively; Based on the correspondence between each gear position of the controllable phase shifter and the output states of several independent power electronic devices, the output state of each power electronic device is converted into a device control signal represented by 0 or 1, where 0 represents the output state of the power electronic device being in the off state and 1 represents the output state of the power electronic device being in the on state, so as to obtain the correspondence between different gear positions of the controllable phase shifter and the device control signals.

3. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 1, characterized in that: Before converting each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number, the acquisition method further includes: Determining whether the controllable phase shifter has a negative decimal gear number; If not, directly convert each gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number; If yes, all decimal gear numbers of the controllable phase shifter are added with a preset value so that all gears of the controllable phase shifter can be represented by positive integers, and then each gear of the controllable phase shifter is converted from the updated decimal gear number to a binary gear number.

4. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 3, characterized in that: The step of adding a preset value to all decimal gear position numbers of the controllable phase shifter so that all gear positions of the controllable phase shifter can be represented by positive integers, and then converting each gear position of the controllable phase shifter from the updated decimal gear position number to a binary gear position number, includes: Assuming that the controllable phase shifter has a range from -x to x, first select a binary bit number y, where x and y are both positive integers, then: 2 y ≥2×x； 2 y-1 <2×x； Add x+1 to all decimal gear position numbers of the controllable phase shifter and input them into the y-bit encoder so that all gear positions of the controllable phase shifter can be represented by positive integers; Then, all updated decimal gear position numbers of the controllable phase shifter are encoded by an encoder, and the binary gear position numbers corresponding to the decimal gear position numbers are represented as A1A2…A y , where A1A2…A y is the output of the y-bit encoder.

5. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 4, characterized in that: The step of obtaining the corresponding logic function according to the truth table includes: According to the truth table, expressions of several logic functions corresponding to the device control signals output by the several power electronic devices are obtained respectively, and the expressions are as follows: F1=(a1A′1A′2…A′ y )+(b1A1A′2…A′ y )+(c1A′1A2…A′ y )+…+(l1A1A2…A y ) … F i =(a i A′1A′2…A′ y )+(b i A1A′2…A′ y )+(c i A′1A2…A′ y )+…+(l i A1A2…A y ) … F Z =(a Z A′1A′2…A′ y )+(b Z A1A′2…A′ y )+(c Z A′1A2…A′ y )+…+(l Z A1A2…A y ); Where A1A2…A y It is the binary gear number, F1, F2, F3, ... F z They represent the device control signal of a certain power electronic device, Z is the number of power electronic devices; a i ,b i ,c i …,l i They are the device control signals F i The function characteristic value of is represented by 0 or 1 according to the truth table, where l is the number of phase shifter gears; A′1, A′2, …, A′ y are binary input signals A1, A2, ..., A y The "not" operation output; The expressions of several logic functions are simplified by a logic converter to obtain the simplest AND / OR form of the logic function of each device control signal.

6. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 5, characterized in that: The step of constructing a logic circuit according to the logic function includes: According to the simplest AND / OR expressions of several logic functions, corresponding different logic elements are selected to build a logic circuit.

7. The method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to claim 1, characterized in that: The power electronic devices are all discrete devices that can be controlled in different gears.

8. A modulation circuit with discrete gear switching of a controllable phase shifter, characterized in that: The modulation circuit is obtained by the method for obtaining a modulation circuit for discrete gear switching of a controllable phase shifter according to any one of claims 1 to 7, comprising: a conversion module, configured to convert any gear position of the controllable phase shifter from a decimal gear position number to a binary gear position number; A logic circuit is constructed according to the logic function corresponding to the truth table, wherein the truth table is listed by the correspondence between the different binary gear numbers of the controllable phase shifter and the device control signal, and the input end of the logic circuit is connected to the output end of the conversion module.

9. The modulation circuit for discrete gear switching of a controllable phase shifter according to claim 8, characterized in that: The conversion module includes an encoder.

10. A terminal, characterized in that: include: A controllable phase shifter and a modulation circuit for discrete gear switching of the controllable phase shifter as claimed in claim 8 or 9, wherein the modulation circuit is used to control switching of the discrete gears of the controllable phase shifter.

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