Analog quantity dual-output light-operated device based on frequency converter control system

Abstract

The utility model relates to an analog quantity double-output light-operated device based on a frequency converter control system, which is characterized in that an input pin I of a CPLD (Complex Programmable Logic Device) logic chip is connected with a port I of a frequency converter main control board, an output pin I of the CPLD logic chip is connected with an input end of a DA (Digital-to-Analog) conversion chip, and an output end of the DA conversion chip is connected with an input end of an operational amplifier circuit I; the output end of the operational amplifier circuit I is connected with a corresponding analog quantity output end; the input end of the second operational amplifier circuit is connected with the corresponding analog quantity input end, the output end of the second operational amplifier circuit is connected with the input end of the AD conversion chip, and the output end of the AD conversion chip is connected with the second input pin of the CPLD logic chip. The utility model has the advantages that the CPLD logic chip is connected with the frequency converter main control board through the optical fiber seat, the stability of data signal transmission is improved, the expansion board is connected with the bottom board through the terminal, the maintenance is easy, the volume is reduced, the installation is convenient, the optical fiber is connected with the frequency converter main control board, and the optical fiber seat is driven to realize the optical communication with the transformer main control board.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage frequency converters, in particular to an analog dual-output light control device based on a frequency converter control system. Background Art

[0002] A high-voltage inverter is a power regulation device used to control high-power motors. A high-voltage inverter control system is a device used to simulate and test the operating status of a high-voltage inverter so that the high-voltage inverter can be debugged and optimized before actual application. Through the high-voltage inverter control system, engineers can test and verify the performance, stability and reliability of the high-voltage inverter. The controllers commonly used in high-voltage inverter control systems are plug-in controllers or integrated controllers.

[0003] In the prior art, the announcement number is CN219831673U, and the name is "an integrated control device for a frequency converter", "including a base plate, a core control board, a first-phase optical fiber expansion board and a second-phase optical fiber expansion board; the base plate is provided with an IO interface, a communication interface and a third-phase optical fiber interface, the base plate is used as a lower circuit board, and a plurality of plug-in terminal sockets are provided at its upper end; the core control board, the first-phase optical fiber expansion board and the second-phase optical fiber expansion board are used as upper circuit boards, and plugs of plug-in terminals are provided at their lower ends, and the upper circuit board is plugged into the plug-in terminal socket of the lower circuit board through the plug-in terminal to realize electrical connection, and An upper and lower double-layer circuit board structure is formed", wherein "the main control chip of the core control board is electrically connected to the base plate through the plug of the plug-in terminal and the socket of the plug-in terminal, so as to realize the electrical connection with the IO interface, communication interface and third-phase optical fiber interface of the base plate; the main control chip of the core control board is also electrically connected to the plug of the plug-in terminal on the first-phase optical fiber extension board and the second-phase optical fiber extension board through the socket of the plug-in terminal of the base plate, so as to realize the electrical connection with the first-phase optical fiber interface and the second-phase optical fiber interface"; the plug-in controller adopts the method of directly connecting the terminal to the base plate, which is prone to poor connection and causes the control device to fail to sample normally.

[0004] The publication number is CN114340345A, and the name is "An integrated controller for a cooling system of high-power power electronic devices". "The integrated controller adopts a SOC chip, and the integrated controller includes: a data processing circuit, a switch quantity acquisition circuit, a switch quantity output circuit, an analog quantity acquisition circuit, and an analog quantity output circuit", wherein "the electrical signal in the analog quantity input signal is voltage or current; the electrical signal in the analog quantity output signal is rotation speed or frequency", "the data processing circuit is connected to the switch quantity acquisition circuit, the switch quantity output circuit, the analog quantity acquisition circuit, and the analog quantity output circuit respectively through the SPI bus; wherein the analog quantity acquisition circuit, the analog quantity output circuit and the data processing circuit are connected through the analog quantity common SPI bus; the switch quantity acquisition circuit, the switch quantity output circuit and the data processing circuit are connected through the switch quantity common SPI bus"; "the integrated controller also includes: a memory circuit; the memory circuit is used to store the operating data and fault recording data of the cooling system", "the memory circuit includes a 32MByte SDRAM and a 96MByte SPI-Flash memory"; since the integrated controller is expensive and is affected by the international situation, there will be supply problems with foreign brand chips. Utility Model Content

[0005] The utility model aims to provide an analog dual-output light control device based on a frequency converter control system, which improves the stability of data sampling, has a simple structure, low cost and is easy to maintain.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] An analog dual-output light control device based on a frequency converter control system comprises an operational amplifier circuit 1, an operational amplifier circuit 2, a DA conversion chip, an AD conversion chip, and a CPLD logic chip. An input pin 1 of the CPLD logic chip is connected to a port 1 of a frequency converter main control board, an output pin 1 of the CPLD logic chip is connected to an input end of the DA conversion chip, an output end of the DA conversion chip is connected to an input end of the operational amplifier circuit 1, and an output end of the operational amplifier circuit 1 is connected to a corresponding analog output end; an input end of the operational amplifier circuit 2 is connected to a corresponding analog input end, an output end of the operational amplifier circuit 2 is connected to an input end of the AD conversion chip, an output end of the AD conversion chip is connected to an input pin 2 of the CPLD logic chip, and an output pin 2 of the CPLD logic chip is connected to a port 2 of the frequency converter main control board.

[0008] The number of analog input terminals and analog output terminals is the same, the input terminal of each operational amplifier circuit 2 is connected to the corresponding analog input terminal, and the output terminal of each operational amplifier circuit 1 is connected to the corresponding analog output terminal.

[0009] Both the operational amplifier circuit 1 and the operational amplifier circuit 2 include a first-stage amplifier and a second-stage amplifier. The non-inverting input terminal of the first-stage amplifier is connected to the corresponding analog input terminal through a resistor R1, the inverting input terminal of the first-stage amplifier is connected to the non-inverting input terminal of the second-stage amplifier, the output terminal of the second-stage amplifier is connected to the corresponding analog output terminal, the inverting input terminal of the first-stage amplifier is connected to the output terminal of the first-stage amplifier, and the inverting input terminal of the second-stage amplifier is connected to the output terminal of the second-stage amplifier.

[0010] The resistor R2 and the capacitor C1 are connected between the non-inverting input terminal of the first-stage amplifier and the resistor R1, and the other end of the resistor R2 and the other end of the capacitor C1 are grounded.

[0011] The first and second stage amplifiers are of the same model.

[0012] An input pin 1 of the CPLD logic chip is connected to a port 1 of the inverter main control board through an optical fiber, and an output pin 2 of the CPLD logic chip is connected to a port 2 of the inverter main control board through an optical fiber.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The CPLD logic chip is connected to the inverter main control board through an optical fiber seat, which improves the stability of the transmitted data signal. The expansion board and the base plate are connected by terminals, which is easy to repair, small in size, and convenient to install. The inverter main control board is connected by optical fiber, and data information is transmitted through the CPLD logic chip, which drives the optical fiber seat to realize optical communication with the transformer main control board;

[0015] 2. The analog dual-output light control device is designed with 18 analog input ports and 16 analog output ports, which can meet the requirements of the number of analog input ports collected at different sites;

[0016] 3. The analog control board is equipped with analog input port and analog output port, which improves the stability, adaptability, easy integration and expansibility, and can be widely used in various industrial production and automation control fields;

[0017] 4. The analog input signal sampling circuit is connected to the input terminal of the corresponding operational amplifier circuit 2 to achieve accurate acquisition and transmission of the analog signal, while isolating the analog signal to improve the stability and reliability of the system;

[0018] 5. The expansion board is connected to the base plate through the board cascade seat, which is convenient for disassembly and maintenance and reduces the installation volume;

[0019] 6. The use of CPLD logic chip improves the flexibility of device design, shortens design time, reduces costs, and improves the reliability of inverter operation;

[0020] 7. The use of operational amplifier circuit improves the performance and reliability of the device, simplifies circuit design and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an analog dual-output light control device based on a frequency converter control system.

[0022] Figure 2 This is a diagram of the analog quantity acquisition process.

[0023] Figure 3 It is the analog output process diagram.

[0024] Figure 4 It is a schematic diagram of the operational amplifier circuit principle.

[0025] Figure 5 It is a schematic diagram of the analog input signal sampling circuit.

[0026] Figure 6 This is a schematic diagram of the DA conversion circuit principle.

[0027] Figure 7 This is the connection principle diagram of the inverter main control board and CPLD Figure 1 .

[0028] Figure 8 This is the connection principle diagram of the inverter main control board and CPLD Figure 2 . DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings of the specification, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0030] The following examples are implemented based on the technical solution of the utility model, and provide detailed implementation methods and specific operation processes, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0031] [Example 1]

[0032] See Figure 1 , an analog dual-output light control device based on a frequency converter control system, including a base plate and an expansion board, the expansion board is provided with an analog input port, an optical fiber seat, a CPLD logic chip, an operational amplifier circuit 1, an operational amplifier circuit 2, a DA conversion circuit, and an AD conversion chip, and the optical fiber seat includes a transmitting optical fiber seat and a receiving optical fiber seat, see Figure 7 ,See Figure 8The base plate is provided with an analog output port. The output pin 2 of the CPLD logic chip is connected to the inverter main control board through an optical fiber seat. The expansion board is connected to the base plate through a board cascade seat. The board cascade seat is a 40-pin board connection seat. The base plate is connected to the host computer through the analog output port.

[0033] See Figure 2 The analog input port includes analog input port 1 and analog input port 2. Both analog input port 1 and analog input port 2 include 9 ports. Each analog input port is connected to the input end of the corresponding operational amplifier circuit 2. The output end of the operational amplifier circuit 2 is connected to the input end of the corresponding AD conversion chip. The output end of the AD conversion chip is connected to the input pin 2 of the CPLD logic chip. Figure 4 The operational amplifier circuit 2 includes a first-stage amplifier U1AU1A and a second-stage amplifier U1B. The non-inverting input terminal of the first-stage amplifier U1A is connected to the corresponding analog input terminal through a resistor R1, the inverting input terminal of the first-stage amplifier U1A is connected to the non-inverting input terminal of the second-stage amplifier U1B, the output terminal of the second-stage amplifier U1B is connected to the corresponding analog output terminal, the inverting input terminal of the first-stage amplifier U1A is connected to the output terminal of the first-stage amplifier U1A, and the inverting input terminal of the second-stage amplifier U1B is connected to the output terminal of the second-stage amplifier U1B; the non-inverting input terminal of the first-stage amplifier and the resistor R1 are respectively connected to a resistor R2 and a capacitor C1, and the other end of the resistor R2 and the other end of the capacitor C1 are grounded; the models of the first-stage amplifier U1A and the second-stage amplifier U1B are both TL0821DR, the model of the AD conversion chip is ADS8555SPMR, and the model of the CPLD logic chip is EF2L45LG144B.

[0034] The CPLD logic chip uploads the received analog input signal to the inverter main control board through the transmitting fiber seat. The inverter main control board transmits the processed data to the CPLD logic chip through the transmitting fiber seat. The CPLD logic chip outputs the processed data of the inverter main control board to the DA conversion chip. The model of the DA conversion chip is DAC7724UB. Each DA conversion chip outputs 4 analog voltage signals. The 4 voltage signals are transmitted to the corresponding analog output ports after passing through the operational amplifier circuit. Figure 1 At the same time, these four voltage signals are connected to the DA chip AD694ARZ in parallel. Figure 6 , used to convert 4 voltage signals into 4 current signals, and the 4 current signals are transmitted to the analog output port; the structure of the operational amplifier circuit 1 is the same as that of the operational amplifier circuit 2, and the output end of the operational amplifier circuit 1 is connected to the analog output port of the base plate through the corresponding analog signal sampling circuit, and the analog output adopts dual output, see Figure 1, analog output port 1 and analog output port 2, both outputs include 4 voltages and 4 currents, and the dual outputs have 8 voltages and 8 currents in total; the analog signal sampling circuit includes a resistor R22, a resistor R12, and a TVS tube ZD1 connected in series, the other end of the resistor R22 and the other end of the TVS tube ZD1 are grounded, and the analog input signal and the input end of the corresponding operational amplifier circuit 2 are connected between the resistor R12 and the TVS tube ZD1, respectively, and the TVS tube ZD1 is used for bidirectional voltage regulation and bidirectional negative resistance overvoltage protection devices, the resistor R22 is a sampling resistor for collecting current signals, and the resistor R12 is used for inputting current signals, which can convert current into voltage signals. If the analog input signal is a voltage signal, R12 = 0Ω, forming an analog current output. Each DA conversion chip can convert and output 4 voltage analog signals. If this design is an 8-way voltage output signal, two DA conversion chips are required; each DA conversion chip can convert 1 current signal. If this design is an 8-way current output signal, 8 AD conversion chips are required.

[0035] The utility model connects the CPLD logic chip with the inverter main control board through an optical fiber seat, which improves the stability of the transmitted data signal. The expansion board and the base plate are connected by terminals, which is easy to repair, reduces the volume, and is convenient to install. The inverter main control board is connected by optical fiber, and data information is transmitted through the CPLD logic chip to drive the optical fiber seat to achieve optical communication with the transformer main control board; the analog dual-output optical control device is designed with 18 analog input ports and 16 analog output ports, which can meet the requirements of the number of analog input port collection in different fields; the analog control board is provided with analog input ports and analog output ports, which improves stability and adaptability. The system has the advantages of easy integration and scalability, and can be widely used in various industrial production and automation control fields; the analog input signal sampling circuit is connected to the input end of the corresponding operational amplifier circuit 2 to achieve accurate acquisition and transmission of the analog signal, while isolating the analog signal to improve the stability and reliability of the system; the expansion board is connected to the base plate through the board cascade seat, which is convenient for disassembly and maintenance and reduces the installation volume; the use of CPLD logic chip improves the design flexibility of the device, shortens the design time, reduces costs, and improves the reliability of the inverter operation; the use of operational amplifier circuit improves the performance and reliability of the device, simplifies the circuit design, and reduces the manufacturing cost.

Claims

1. An analog dual-output light control device based on a frequency converter control system, characterized in that: It includes an operational amplifier circuit 1, an operational amplifier circuit 2, a DA conversion chip, an AD conversion chip, and a CPLD logic chip. An input pin 1 of the CPLD logic chip is connected to a port 1 of a frequency converter main control board, an output pin 1 of the CPLD logic chip is connected to an input end of the DA conversion chip, an output end of the DA conversion chip is connected to an input end of the operational amplifier circuit 1, and an output end of the operational amplifier circuit 1 is connected to a corresponding analog output end; an input end of the operational amplifier circuit 2 is connected to a corresponding analog input end, an output end of the operational amplifier circuit 2 is connected to an input end of the AD conversion chip, an output end of the AD conversion chip is connected to an input pin 2 of the CPLD logic chip, and an output pin 2 of the CPLD logic chip is connected to a port 2 of the frequency converter main control board.

2. According to claim 1, an analog dual-output light control device based on a frequency converter control system is characterized in that: The number of analog input terminals and analog output terminals is the same, the input terminal of each operational amplifier circuit 2 is connected to the corresponding analog input terminal, and the output terminal of each operational amplifier circuit 1 is connected to the corresponding analog output terminal.

3. The analog dual-output light control device based on a frequency converter control system according to claim 2, characterized in that: The operational amplifier circuit 1 and the operational amplifier circuit 2 both include a first-stage amplifier and a second-stage amplifier. The non-inverting input terminal of the first-stage amplifier is connected to the corresponding analog input terminal through a resistor R1, the inverting input terminal of the first-stage amplifier is connected to the non-inverting input terminal of the second-stage amplifier, the output terminal of the second-stage amplifier is connected to the corresponding analog output terminal, the inverting input terminal of the first-stage amplifier is connected to the output terminal of the first-stage amplifier, and the inverting input terminal of the second-stage amplifier is connected to the output terminal of the second-stage amplifier.

4. The analog dual-output light control device based on a frequency converter control system according to claim 3, characterized in that: The resistor R2 and the capacitor C1 are connected between the non-inverting input terminal of the first-stage amplifier and the resistor R1, and the other end of the resistor R2 and the other end of the capacitor C1 are grounded.

5. The analog dual-output light control device based on a frequency converter control system according to claim 3, characterized in that: The first and second stage amplifiers are of the same model.

6. The analog dual-output light control device based on a frequency converter control system according to claim 1, characterized in that: An input pin 1 of the CPLD logic chip is connected to a port 1 of the inverter main control board through an optical fiber, and an output pin 2 of the CPLD logic chip is connected to a port 2 of the inverter main control board through an optical fiber.

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