CN114355822A

CN114355822A - Advanced general type photometer control system

Info

Publication number: CN114355822A
Application number: CN202210048795.8A
Authority: CN
Inventors: 黄雄; 胡志东; 王军令
Original assignee: SHANGHAI TECHCOMP INSTRUMENT Ltd
Current assignee: SHANGHAI TECHCOMP INSTRUMENT Ltd
Priority date: 2022-01-17
Filing date: 2022-01-17
Publication date: 2022-04-15

Abstract

The invention discloses an advanced universal photometer control system, which comprises: the circuit system of the control system is modularized and divided into three boards, wherein the three boards comprise a core board, a main board and a driving board; the core board is configured with an MCU, an SDRAM and a FLASH; the main function of the main board is to carry a core board, an RGB liquid crystal driving circuit and connect with a driving board through a data flat cable, and the main function of the driving board is to configure a stepping motor driving interface, an optical coupler positioning interface, an online driving circuit interface and an accessory function interface. The electric system is highly integrated, generalized and modularized, and considers and integrates all hardware interfaces which may be needed at present; such as a 150W xenon lamp power switch control interface of a fluorescence photometer, a deuterium lamp and tungsten lamp switch control interface of a spectrophotometer, an integrating sphere accessory interface, a magnetic stirrer interface and the like; the same series of instruments with various models and configurations can use the hardware circuit control system.

Description

Advanced general type photometer control system

Technical Field

The invention relates to the technical field of universal photometer control systems, in particular to an advanced universal photometer control system.

Background

With the rapid development of integrated circuits, more intelligent convenience and experience are provided for life and work of people. Necessarily, scientific instrument products need to be continuously updated and innovated, and more intelligent and convenient application and customer experience are provided to adapt to development of scientific research so as to keep competitiveness of the products and market demands. Because company's photometer model is various, so must develop a set of advanced general type electrical control system, promote instrument performance on the one hand and satisfy market development demand, on the other hand saves company's research and development cost, administrative cost and manufacturing cost, promotes the market competitiveness of product.

Disclosure of Invention

The invention aims to provide an advanced universal photometer control system, which solves the problems that instruments in the market are high-end, intelligent, diversified and specialized in requirements, and research and development costs, management costs and production costs of companies are increased.

In order to achieve the purpose, the invention provides the following technical scheme: an advanced universal light meter control system comprising: the control system, control system's circuit system adopts the modularization and divide into three boards, three boards include nuclear core plate, mainboard, drive plate. The core board is configured with an MCU, an SDRAM and a FLASH; the main function of the mainboard is to carry on a core board, an RGB liquid crystal driving circuit and connect with a driving board through a data flat cable, and the main function of the driving board is to configure a stepping motor driving interface, an optical coupler positioning interface, an online driving circuit interface, an accessory function interface, an ADC amplification sampling data interface and a power interface.

As a preferred embodiment of the invention, the MCU selects a chip with the model number of STM32H743 and a master frequency of 400MHz, the FLASH is 2MB, the SDRAM is 512kB, and the package LQFP208 is adopted and is provided with 168I/O ports, 1 TFT LCD controller, 1 Ethernet MAC, 2 USB OTG interfaces, 4 USARTs and 4 IICs.

As a preferred embodiment of the invention, the FLASH selects Wapont W25Q256, and uses a Quad SPI interface, so that the data rate can reach 532MHz, and the FLASH can be used for storing user data or a host program and sufficiently configuring various user functions, test data and curve parameters.

In a preferred embodiment of the present invention, the main board is configured with an RGB liquid crystal screen interface defined by a Digital-50P interface, a capacitive touch panel interface of an IIC interface, and a liquid crystal backlight power interface.

As a preferred embodiment of the present invention, the control system is configured with two 256-segment ST chips STSTSTSTSTSPIN 820TI driving two grating motors and three TI cost-effective DRV8821 chips driving six functional stepper motors.

As a preferred embodiment of the invention, the online driving circuit interface adopts a chip CP2102, has a simple circuit, is stable and reliable, and uses 115200 baud rate to quickly transmit data.

As a preferred embodiment of the present invention, the control system is configured with a network connection port, which is convenient for a client to perform network or local area network management on laboratory equipment or data; in addition, a serial micro-connector, two USB HOST interfaces and a serial Bluetooth WIFI module are also configured.

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

the core control chip of the electrical system selects an STM32H7 series controller STM32H743 which is provided by an intentional Semiconductor (ST) and based on an ARM latest Cortex-M7 kernel, and the STM32H7 series controller is a brand-new flagship in an STM32 product; the MCU of the type can perfectly experience the control speed of the touch screen of the instrument and the ultra-fast and ultra-strong data processing capacity; the memory is very large, and a large number of user functions, professional analysis application functions and data storage functions can be configured. The electric system is highly integrated, generalized and modularized, and considers and integrates all the hardware interfaces which are possibly needed at present; such as a 150W xenon lamp power switch control interface of a fluorescence photometer, a deuterium lamp and tungsten lamp switch control interface of a spectrophotometer, an integrating sphere accessory interface, a magnetic stirrer interface and the like; instruments configured in the same series with various models can use the hardware circuit control system; the external interfaces of the electrical system are rich, and all online communication interfaces required by the current companies, such as USB online, ethernet online, wireless online (bluetooth or WIFI), are considered and integrated. Instruments of the same type, the same series and different models can use the same single-chip microcomputer control software, namely, a set of single-chip microcomputer programs serve the models of all various parameter configurations (such as single beam, double beam, whether the optional accessory function interface can be supported or not) of the same type and the same series, and the corresponding configuration of the corresponding models before delivery can be carried out at the background; description of the drawings: fluorescence and spectroscopy are of different types, i.e. a single software control (operating) system. The hardware integrated circuit of the electric system selects a chip which is newer in the market and has very high cost performance, and the components are pasted as much as possible, so that the mass pasting production is facilitated, and the production cost and the rejection rate are reduced; the electrical control system is very intelligent and humanized in operation, stable and reliable in test data and excellent in index.

Drawings

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

FIG. 2 is a schematic diagram of the control system MCU U1A of the present invention;

FIG. 3 is a schematic diagram of the control system MCU U1B of the present invention;

FIG. 4 is a 32M SDRAM circuit of the present invention;

FIG. 5 is a QSPI interface FLASH circuit of the present invention;

FIG. 6 is a RGB liquid crystal driving interface circuit according to the present invention;

FIG. 7 is a step motor drive circuit of the present invention;

FIG. 8 is a table of parameter configuration for an STSTSTSPIN 820 chip according to the present invention;

FIG. 9 is a table of the configuration of the 1/2 micro-step indexer function of the DRV8821 of the present invention;

FIG. 10 is a USB on-line circuit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: an advanced universal light meter control system comprising: the control system, control system's circuit system adopts the modularization and divide into three boards, three boards include nuclear core plate, mainboard, drive plate. The core board is configured with an MCU, an SDRAM and a FLASH; the main function of the mainboard is to carry a core board, an RGB liquid crystal driving circuit and connect the core board and the RGB liquid crystal driving circuit with a driving board through a data flat cable, the main function of the driving board is to configure a stepping motor driving interface, an optical coupler positioning interface, an online driving circuit interface, an accessory function interface, an ADC amplification sampling data interface and a power supply interface, the core control chip of an electrical system selects an STM32H7 series controller STM32H743 which is provided by an ideological Semiconductor (ST) and is based on an ARM latest Cortex-M7 kernel, and the controller is a brand new flagship in an STM32 product; the MCU of the type can perfectly experience the control speed of the touch screen of the instrument and the ultra-fast and ultra-strong data processing capacity; the memory is very large, and a large number of user functions, professional analysis application functions and data storage functions can be configured. The electric system is highly integrated, generalized and modularized, and considers and integrates all the hardware interfaces which are possibly needed at present; such as a 150W xenon lamp power switch control interface of a fluorescence photometer, a deuterium lamp and tungsten lamp switch control interface of a spectrophotometer, an integrating sphere accessory interface, a magnetic stirrer interface and the like; instruments configured in the same series with various models can use the hardware circuit control system; the external interfaces of the electrical system are rich, and all online communication interfaces required by the current companies, such as USB online, ethernet online, wireless online (bluetooth or WIFI), are considered and integrated. Instruments of the same type, the same series and different models can use the same single-chip microcomputer control software, namely, a set of single-chip microcomputer programs serve the models of all various parameter configurations (such as single beam, double beam, whether the optional accessory function interface can be supported or not) of the same type and the same series, and the corresponding configuration of the corresponding models before delivery can be carried out at the background; description of the drawings: fluorescence and spectroscopy are of different types, i.e. a single software control (operating) system. The hardware integrated circuit of the electric system selects a chip which is newer in the market and has very high cost performance, and the components are pasted as much as possible, so that the mass pasting production is facilitated, and the production cost and the rejection rate are reduced; the electrical control system is very intelligent and humanized in operation, stable and reliable in test data and excellent in index.

Further improved, as shown in fig. 1, 2 and 3: MCU chooses for use the model to be STM32H 743's chip and dominant frequency 400MHz, FLASH is 2MB, the SDRAM is 512kB, adopts encapsulation LQFP208 it to have 168I/O mouth, 1 TFT LCD controller, 1 ethernet MAC, 2 USB OTG interface, 4 USARTs and 4 IICs, and 256M-bit,32M-byte, Huabang W9825G6KH-6 are chosen to 32M SDRAM, and data number rate 166 MHz.

Further improved, as shown in fig. 4: the FLASH selects Wabong W25Q256, uses a Quad SPI interface, has a data rate of 532MHz, can be used for storing user data or host programs, and is enough for configuring various user functions, test data and curve parameters.

Further improved, as shown in fig. 6: the main board is provided with an RGB liquid crystal screen interface defined by a Digital-50P interface, a capacitance touch panel interface and a liquid crystal backlight power supply interface of an IIC interface, the resolution is 10.1 inches and 7 inches of RGB1024 x 600, the data interface is defined as a Digital-50P color bare screen, and J1 data interfaces can be used; j2 is a liquid crystal backlight power interface for LED backlight of 10.1 inch RGB screen; 7 inch RGB screens typically do not have separate LED backlight power lines; the IIC data interfaces of the 10.1-inch and 7-inch capacitance touch pads are defined in different positions and different in interface size, so that two CTP interfaces are reserved, but the IO interfaces have the same function and can share the MCU port; as above, FIG. J3 is used with a 7 inch capacitive touchpad and J4 is used with a 10.1 inch capacitive touchpad.

Further improved, as shown in fig. 7, 8 and 9: the control system is provided with two 256 subdivided ST chips STSTSTSTSPIN 820TI for driving two grating motors and three TI high-cost-performance DRV8821 chips for driving six functional stepping motors, the wavelength grating driving motor is driven by a stepping motor special driver STSPIN820 with excellent cost performance of an intentional semiconductor, and 4mm x 4mm QFN packaging is adopted, so that 256 micro-step resolution, 7V-45V working voltage and 1.5A maximum output RMS current can be achieved, and designers can flexibly apply and meet various power and torque requirements. And a 0.9-degree resolution stepping motor is configured, so that the wavelength precision requirement and the wavelength repeatability of a fluorescence photometer and a spectrophotometer can be completely met. Two STSTSTSTPIN 820 respectively and independently drive EX wavelength grating and EM wavelength grating of the fluorescence photometer, or only one wavelength grating for driving the spectrophotometer is used; the application configuration and the function of the STSTSTPIN 820 motor driving chip in the circuit of the system are introduced as follows: DECAY is the attenuation mode selection of STSPIN820 chip, and can be selectively controlled by the I/O port of MCU. The DECAY is 1, the circuit is configured in a slow attenuation mode, the heat productivity of the motor is low, the operation is smoother, the noise is lower, and the circuit is suitable for being used under the conditions of full speed or low microstep resolution of the motor. When DECAY is equal to 0, the circuit is configured to be in a mixed attenuation mode and is suitable for being used under the conditions of high precision and high microstep resolution, such as 256 microstep resolution; m1, M2, M3 are the subdivision mode selection items of STSPIN820 chip, and the parameter configuration table is shown in FIG. 8: in the actual configuration and use process, when the wavelength is moved, the configuration M1 is 0, M2 is 0, and M3 is 0, that is, Full-step; in the wavelength high-precision scanning process, M1 is 1, M2 is 1, and M3 is 1, namely 256 subdivision drives are configured; DIR is a rotation direction control port of the motor, is controlled by an IO port of the MCU, and can realize the rapid movement of the wavelength by the forward and reverse rotation of the grating motor; the STEP sets the number of STEPs needed by the STEP angle distance for the rotation and rotation of the stepping motor, and the MCU program configures corresponding driving parameters; the driving current of the motor is determined by the voltage value of the VREF pin of STSPIN820, and the specific formula is as follows: i ═ VREF/Risen. In the circuit, VREF is stabilized to DC2.5V by a 2.5V voltage reference triode LM4040C25IDBZT, and then is divided by a 4.75K omega resistor and a 2.05K omega resistor to obtain 0.75V VREF; selecting a load resistor Risen as two resistors of 2.49 omega-0.5W which are connected in parallel, namely the Risen is 1.25 omega; driving current I ═ VREF/Risen ═ 0.75V/1.25 Ω ═ 0.6A; a special driver DRV8821 of a Texas instrument for a high-cost-performance stepping motor is packaged by TSSOP-48, and is a 1.5A double-path bipolar stepping motor driver with an 1/8 micro-stepping indexer, the working voltage is 8V to 32V, and the maximum output current of each phase is 1.5A, so that a designer can flexibly apply the driver and meet various power and torque requirements. The function of the DRV8821 motor driving chip is introduced as follows: the circuit configuration DECAY is 0 and is fixed in a slow attenuation mode, so that the heat productivity of the motor is less, the operation is smoother and the noise is less.

The solidified abssm 0 is 1, abssm 1 is 0, CDUSM0 is 1, CDUSM1 is 0, that is, the functional configuration table of 1/2 micro-step indexer of DRV8821 is shown in fig. 9: DIR is a rotation direction control port of the motor and is controlled by an IO port of the MCU; when DIR is 1, the rotation direction of the stepping motor is clockwise; when DIR is equal to 0, the rotation direction of the stepping motor is anticlockwise.

The STEP is the driving STEP number of the stepping motor, and the MCU program configures corresponding driving parameters.

The voltage value of the pin VREF of the chip DRV8821 and the load resistor Risen jointly determine the load current of the motor, and the specific formula is as follows: i ═ VREF/(5 × Risen). In the circuit, VREF directly takes the V3P3 of the chip, namely VREF is 3.3V; selecting a load resistor Risen as two resistors of 2.49 omega-0.5W which are connected in parallel, namely the Risen is 1.25 omega; the driving current I becomes VREF/(5 × Risen) 3.3V/(5 × 1.25 Ω) 0.53A.

Further improved, as shown in fig. 10: the online driving circuit interface adopts a chip CP2102, has a simple circuit, is stable and reliable, and uses 115200 baud rate to quickly transmit data.

Further improved, as shown in fig. 1: the control system is provided with a network online port, so that a client can conveniently manage laboratory equipment or data through a network or a local area network; in addition, a serial micro-connector, two USB HOST interfaces and a serial Bluetooth WIFI module are also configured.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An advanced general type photometer control system, characterized in that: the method comprises the following steps: the control system, control system's circuit system adopts the modularization and divide into three boards, three boards include nuclear core plate, mainboard, drive plate. The core board is configured with an MCU, an SDRAM and a FLASH; the main function of the mainboard is to carry on a core board, an RGB liquid crystal driving circuit and connect with a driving board through a data flat cable, and the main function of the driving board is to configure a stepping motor driving interface, an optical coupler positioning interface, an online driving circuit interface, an accessory function interface, an ADC amplification sampling data interface and a power interface.

2. The advanced universal photometer control system of claim 1, wherein: the MCU selects a chip with the model number of STM32H743 and a main frequency of 400MHz, the FLASH is 2MB, the SDRAM is 512kB, and the package LQFP208 is adopted and provided with 168I/O ports, 1 TFT LCD controller, 1 Ethernet MAC, 2 USB OTG interfaces, 4 USARTs and 4 IICs.

3. The advanced universal photometer control system of claim 1, wherein: the FLASH selects Wabong W25Q256, uses a Quad SPI interface, has a data rate of 532MHz, can be used for storing user data or host programs, and is enough for configuring various user functions, test data and curve parameters.

4. The advanced universal photometer control system of claim 1, wherein: the main board is provided with an RGB liquid crystal screen interface defined by a Digital-50P interface, a capacitance touch panel interface of an IIC interface and a liquid crystal backlight power interface.

5. The advanced universal photometer control system of claim 1, wherein: the control system is provided with two 256 subdivision ST chips STSTSTSTSPIN 820TI driving two grating motors, and three TI high-cost-performance DRV8821 chips driving six functional stepping motors.

6. The advanced universal photometer control system of claim 1, wherein: the online driving circuit interface adopts a chip CP2102, has a simple circuit, is stable and reliable, and uses 115200 baud rate to quickly transmit data.

7. The advanced universal photometer control system of claim 3, wherein: the control system is provided with a network online port, so that a client can conveniently manage laboratory equipment or data through a network or a local area network; in addition, a serial micro-connector, two USB HOST interfaces and a serial Bluetooth WIFI module are also configured.