CN114345565A - Low-cost integrated centrifuge control system - Google Patents
Low-cost integrated centrifuge control system Download PDFInfo
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- CN114345565A CN114345565A CN202210031433.8A CN202210031433A CN114345565A CN 114345565 A CN114345565 A CN 114345565A CN 202210031433 A CN202210031433 A CN 202210031433A CN 114345565 A CN114345565 A CN 114345565A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
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Abstract
The invention discloses a low-cost integrated centrifuge control system, which comprises a power supply, a Micro Control Unit (MCU), a motor drive, an unbalance detection, a signal indicator light and a buzzer, an eprom storage, a debugging and downloading interface, a keyboard drive, a screen drive, a mode selection interface, an encoder control, a door lock control, a rotor identification and rotating speed detection, a temperature detection, a compressor and a fan control, wherein the MCU is used for controlling the motor drive and the unbalance detection; the power supply supplies power to the whole centrifuge control system, the motor drive is connected to the corresponding interface of the processor through electromagnetic isolation, and other modules are directly connected to the corresponding interface of the processor. The invention integrates all the control, only one MCU is needed to simultaneously realize the control of the motor, the sensor and the human-computer interface, one MCU is cancelled, and another set of software is not needed, thereby reducing the software development cost and the hardware cost, and improving the stability of the whole system because the communication is not needed to be established.
Description
Technical Field
The invention relates to the technical field of biochemical instruments, in particular to a low-cost integrated centrifuge control system.
Background
Along with the development of science and technology, the high-tech of the instruments gradually becomes the mainstream of the development of the science and technology and industry of the instruments, and the high-tech of the instruments puts forward higher, more and more requirements on the instruments, such as higher speed, better stability, more convenience and more humanization in use and lower cost.
The existing centrifuge control system adopts a multi-MCU mode, one MCU is mainly used for controlling a motor, the other is used for controlling a human-computer interface and various sensors, the control system needs two sets of control software to control respectively, then communication between the MCUs is established, and in addition, the MCU price is high in recent years, the control mode increases labor cost and hardware cost.
Disclosure of Invention
The invention aims to provide a low-cost integrated centrifuge control system, solves the problems of overhigh development cost and hardware cost, insufficient integration and generalization, complex communication between hardware and poor system stability, and meets the actual use requirement.
In order to achieve the purpose, the invention provides the following technical scheme: a low-cost integrated centrifuge control system comprises a power supply, a Micro Control Unit (MCU), a motor drive, an unbalance detection, a signal indicator light and a buzzer, an eeprom storage, a debugging and downloading interface, a keyboard drive, a screen drive, a mode selection interface, an encoder control, a door lock control, a rotor identification and rotating speed detection, a temperature detection, a compressor and a fan control;
the power supply supplies power to the whole centrifuge control system, the motor drive is connected to the corresponding interface of the processor through electromagnetic isolation, and other modules are directly connected to the corresponding interface of the processor;
the control system also comprises an ARM processor as a core, wherein the ARM processor directly controls the sensor and controls the motor through the isolator;
advanced timer TIM1 driving motor of little the control unit (MCU) operation, advanced timer TIM8 drive Hall sensor realizes rotor discernment and rotational speed and detects, encoder count is realized to general timer TIM4, the PWM brake function of motor is realized to general timer TIM5, unbalanced detection is realized to general timer TIM3, eeprom's drive is realized to the IIC interface, ADC realizes the detection of two way temperature sensor and MCU temperature, the control to the screen is realized to the UART interface, the control of lock is realized to basic IO mouth, the control of compressor and the control of fan.
As a preferred embodiment of the present invention, the power input of the power supply supplies power to the motor drive after being rectified by EMI filtering; after AC/DC conversion, the DC/DC conversion supplies power to other modules; and the voltage after AC/DC conversion is supplied to the motor drive after passing through the isolated power supply.
In a preferred embodiment of the present invention, the motor drive is a strong electric system, and the other modules are weak electric systems.
As a preferred embodiment of the present invention, the unbalance detection uses OPA2180IDR to remove a direct current component from a hall signal and amplify an alternating current component, uses AD8667ARZ-REEL to filter a high frequency noise wave, generates a digital PWM signal after comparison, and the generated PWM signal is connected to an ARM processor, and the processor obtains a corresponding value of an unbalance amount by detecting a PWM duty ratio, where the larger the unbalance amount is, the larger the duty ratio is, the maximum duty ratio is 50%, when the unbalance amount is smaller than a certain value, an unbalanced voltage value is smaller than the comparison value, the PWM wave becomes a straight line, and the PWM duty ratio is 0%.
In a preferred embodiment of the present invention, the motor driver uses IGCM20F60GAXKMA1 as a motor driving chip, and uses ADUM160N0BRZ-RL7 as an isolation chip of the motor driving chip; a voltage comparator LM393DT is used for converting whether the bus voltage reaches the brake voltage, whether the bus voltage is overvoltage, whether the motor driving core is overcurrent, whether the motor driving core is overheated and wrong, and whether the motor is overheated into a digital signal; the digital signal converted by LM393DT was isolated using IGCM20F60GAXKMA 1.
As a preferred embodiment of the present invention, the rotor identification and the rotation speed detection are obtained by detecting two Hall signals obtained by rotating the motor for one circle; the advanced timer TIM8 performs rotor identification by detecting two Hall signal time ratios of one rotation of the motor and performing rotation speed detection, and the advanced timer TIM8 performs rotor identification by detecting two Hall signal time ratios of one rotation of the motor.
Compared with the prior art, the invention has the following beneficial effects:
the invention integrates all the control, only one MCU is needed to simultaneously realize the control of the motor, the sensor and the human-computer interface, one MCU is cancelled, and another set of software is not needed, thereby reducing the software development cost and the hardware cost, and improving the stability of the whole system because the communication is not needed to be established.
Drawings
FIG. 1 is a block diagram of a control system of the present invention;
FIG. 2 is a schematic diagram of the control system of the present invention;
FIG. 3 is a block diagram of the power supply of the present invention;
FIG. 4 is a schematic diagram of the MCU of the present invention;
FIG. 5 is a motor drive schematic of the present invention;
FIG. 6 is an imbalance detection schematic of the present invention;
FIG. 7 is a waveform illustrating imbalance detection according to the present invention;
FIG. 8 is a schematic diagram of a conventional peripheral device according to the present invention;
fig. 9 is a schematic diagram of the sensor drive of 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. 1-9, the present invention provides a technical solution: a low-cost integrated centrifuge control system comprises a power supply 100, a Micro Control Unit (MCU)200, a motor drive 300, an unbalance detection 400, a signal indicator light and a buzzer 500, an eeprom memory 501, a debugging download interface 502, a keyboard drive 503, a screen drive 504, a mode selection interface 505, an encoder control 600, a door lock control 700, a rotor identification and rotation speed detection 800, a temperature detection 900 and a compressor and fan control 901; the power supply part supplies power to the whole centrifuge control system, the ARM processor is used as a core, the motor driving part is connected to the corresponding interface of the processor through electromagnetic isolation, and other modules are directly connected to the corresponding interface of the processor.
As shown in FIG. 2, the processor controls the whole motor through the isolator, the processor directly controls other sensors, and the whole control system is completed by one processor, so that the hardware cost and the software development workload are reduced.
As shown in fig. 3, the motor driver 104 is a strong current system, and the other modules 106 are weak current systems; the power input enters the AC/DC module 102 after being subjected to EMI filtering, and the AC/DC module 102 converts the voltage into 24V and sends the voltage to the isolation power supply 105, the DC/DC module 103 and the weak current power supply part; the DC/DC module 103 is converted into +/-15V, 5V and 3.3V and then enters a weak current power supply part 106; the isolated power supply 105 is converted into 15V to supply power to the motor drive 104, and the EMI filter is rectified to supply power to the motor drive 104.
As shown in FIG. 4, the Micro Control Unit (MCU)200 is STM32F407VGT 6; STM32F407VGT6 is based on Cortex M4 kernel, with FPU and DSP instruction set, running frequency 168Mhz, SRAM in 192KB chip, Flash in 1024KB chip, 2 advanced timers, 10 universal timers, 2 basic timers; the advanced timer TIM1 drives a motor to operate, the advanced timer TIM8 drives a Hall sensor to realize rotor identification and rotating speed detection, the universal timer TIM4 realizes encoder counting, the universal timer TIM5 realizes a PWM braking function of the motor, and the universal timer TIM3 realizes unbalance detection; the IIC interface 1 realizes the driving of eeprom; the ADC realizes the detection of the temperatures of the two paths of temperature sensors and the MCU; the UART interface realizes the control of the screen; the powerful functions of the MCU enable control of all the modules.
As shown in fig. 5, the motor driver 300 uses the IGCM20F60GAXKMA1 as a motor driving chip, the IGCM20F60GAXKMA1 has a maximum peak current of 45A, and the output current reaches 20A; the drive chip IGCM20F60GAXKMA1 uses ADUM160N0BRZ-RL7 for control of isolation, and isolation voltage is 2500V; brake, error reporting and state signals of the motor use ADuM161N1BRZ-RL7 and isolation voltage 2500V, and the signals use a voltage comparator LM393DT to convert various analog signals into digital signals which are transmitted to an ARM processor through an isolation chip ADuM161N1BRZ-RL 7; the whole control of the motor drive 300 is realized by the interaction with the MCU through the isolation chips ADUM160N0BRZ-RL7 and ADuM161N1BRZ-RL 7; the MCU judges whether the bus voltage reaches the brake voltage or not and whether the bus voltage is overvoltage or not by reading the signal of the isolation chip; whether the motor driving chip IGCM20F60GAXKMA1 is over-current, over-heat and error; whether the motor is overheated; the MCU acquires the feedback signals to realize the control of the motor.
As shown in fig. 6, the unbalance detection 400 removes a direct current component from a hall signal by using an OPA2180IDR to amplify an alternating current component, filters a high-frequency clutter by using an AD8667ARZ-REEL, generates a digital PWM signal after comparison, and connects a generated PWM wave signal to an ARM processor, the processor obtains a corresponding value of an unbalance amount by detecting a PWM duty ratio, the larger the unbalance amount is, the larger the duty ratio is, the maximum 50% of the duty ratio is, when the unbalance amount is smaller than a certain value, an unbalanced voltage value is smaller than a comparison value, the PWM wave becomes a straight line, and the PWM duty ratio is 0%; the mode of replacing ADC sampling by detecting the duty ratio is simpler, more accurate and more stable to detect the maximum unbalance amount, a high-speed ADC sampling mode is not needed, the high-speed ADC sampling needs high CPU utilization rate, in order to accurately detect the maximum value of unbalance, according to the Nyquist theorem, the sampling frequency of the ADC is at least 2 times of the signal waveform, and the mode of detecting the duty ratio by adopting an interruption mode greatly reduces the occupation of the CPU compared with the mode of ADC sampling, and reduces the consumption of resources; t7 in fig. 7 is a straight line where the duty ratio is 0 when the unbalance amount is smaller than the comparison value; t3 is data that when the imbalance is greater than the comparison value, the PWM wave duty ratio is less than 50%; when the imbalance of T6 is far greater than the comparison value, the PWM wave duty ratio is close to 50%, and the detection limit is exceeded.
As shown in fig. 8, in the general peripheral principle diagram, a signal indicator lamp 500_1 and a buzzer 500_2 indicate the state of the centrifuge through sound and light; the eprom chip 501 is connected with an IIC1 interface of the MCU through an IIC bus by using an AT24C512C-SSHD-T with the storage capacity of 64 KB; the debugging download interface 502 is an SWD interface, and only 4 lines are needed to be connected with the MCU; the keyboard driver 503 is connected to the MCU using 4 IO ports; the screen driver 504 is connected to USART1 and USART2 of the MCU using two UARTs; mode select 505 is a 2-bit toggle switch with a total of 4 states connected to the MCU's basic IO.
As shown in fig. 9, the encoder driver 500 in the sensor schematic is connected to the MCU universal timer TIM4, and the TIM4 timer is set to encoder count mode; the door lock switch 700_1 and the door lock states 700_2 and 700_3 are connected with a common IO of a timer to control the door lock; the rotor identification and speed detection 800 is connected to the MCU advanced timer TIM 8; the centrifugal cavity temperature detection 900_1 and the environment temperature detection 900_2 are connected with an ADC1 of the MCU; the compressor control 901_1 and the fan control 901_2 are connected with the basic IO of the MCU; the MCU detects the environment temperature and the temperature of the centrifugal cavity, then controls the compressor, and obtains the required display temperature of the centrifugal cavity through linear fitting and data processing of the temperature
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 (6)
1. The utility model provides a low-cost centrifuge control system that integrates which characterized in that: the system comprises a power supply, a Micro Control Unit (MCU), a motor drive, an unbalance detection, a signal indicator light and a buzzer, an eprom storage, a debugging and downloading interface, a keyboard drive, a screen drive, a mode selection interface, an encoder control, a door lock control, a rotor identification and rotating speed detection, a temperature detection, a compressor and a fan control;
the power supply supplies power to the whole centrifuge control system, the motor drive is connected to the corresponding interface of the processor through electromagnetic isolation, and other modules are directly connected to the corresponding interface of the processor;
the control system also comprises an ARM processor as a core, wherein the ARM processor directly controls the sensor and controls the motor through the isolator;
advanced timer TIM1 driving motor of little the control unit (MCU) operation, advanced timer TIM8 drive Hall sensor realizes rotor discernment and rotational speed and detects, encoder count is realized to general timer TIM4, the PWM brake function of motor is realized to general timer TIM5, unbalanced detection is realized to general timer TIM3, eeprom's drive is realized to the IIC interface, ADC realizes the detection of two way temperature sensor and MCU temperature, the control to the screen is realized to the UART interface, the control of lock is realized to basic IO mouth, the control of compressor and the control of fan.
2. A low cost integrated centrifuge control system as defined in claim 1 wherein: the power input of the power supply supplies power to the motor drive after EMI filtering rectification; after AC/DC conversion, the DC/DC conversion supplies power to other modules; and the voltage after AC/DC conversion is supplied to the motor drive after passing through the isolated power supply.
3. A low cost integrated centrifuge control system as defined in claim 2 wherein: the motor drive is a strong current system, and other modules are weak current systems.
4. A low cost integrated centrifuge control system as defined in claim 1 wherein: the unbalance detection method comprises the steps of removing direct-current components from Hall signals by using OPA2180IDR to amplify alternating-current components, filtering high-frequency noise waves by using AD8667ARZ-REEL, generating digital PWM signals after comparison, connecting the generated PWM wave signals with an ARM processor, obtaining a corresponding value of unbalance by the processor through detecting the duty ratio of PWM, wherein the larger the unbalance is, the larger the duty ratio is, the maximum duty ratio is 50%, when the unbalance is smaller than a certain value, the unbalanced voltage value is smaller than the comparison value, the PWM wave is changed into a straight line, and the PWM duty ratio is 0%.
5. A low cost integrated centrifuge control system as defined in claim 1 wherein: the motor drive uses IGCM20F60GAXKMA1 as a motor drive chip, and uses ADUM160N0BRZ-RL7 as an isolation chip of the motor drive chip; a voltage comparator LM393DT is used for converting whether the bus voltage reaches the brake voltage, whether the bus voltage is overvoltage, whether the motor driving core is overcurrent, whether the motor driving core is overheated and wrong, and whether the motor is overheated into a digital signal; the digital signal converted by LM393DT was isolated using IGCM20F60GAXKMA 1.
6. A low cost integrated centrifuge control system as defined in claim 1 wherein: the rotor identification and the rotating speed detection are obtained by detecting two Hall signals obtained by rotating the motor for one circle; the advanced timer TIM8 performs rotor identification by detecting two Hall signal time ratios of one rotation of the motor and performing rotation speed detection, and the advanced timer TIM8 performs rotor identification by detecting two Hall signal time ratios of one rotation of the motor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114812686A (en) * | 2022-05-10 | 2022-07-29 | 一汽丰田汽车(成都)有限公司长春丰越分公司 | Servo motor prevention and security system and method |
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