CN115328001A - Equipment signal acquisition device and method for cooling system of new energy automobile battery replacement station - Google Patents
Equipment signal acquisition device and method for cooling system of new energy automobile battery replacement station Download PDFInfo
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- CN115328001A CN115328001A CN202211142329.2A CN202211142329A CN115328001A CN 115328001 A CN115328001 A CN 115328001A CN 202211142329 A CN202211142329 A CN 202211142329A CN 115328001 A CN115328001 A CN 115328001A
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- 238000001816 cooling Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004891 communication Methods 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
The invention relates to a device signal acquisition device of a cooling system of a new energy automobile battery replacement station, which comprises: the system comprises a singlechip, an RS485 transceiver, a digital isolator, an SPIFlash memory and a frequency converter; the single chip microcomputer is electrically connected with the RS485 transceiver, the RS485 transceiver is electrically connected with the frequency converter, a digital isolator is arranged on a circuit between the single chip microcomputer and the RS485 transceiver, and the single chip microcomputer is externally connected with the SPIFlash memory; the internal wiring of the single chip microcomputer is connected with equipment of a power station cooling system through external wiring, and external switches are arranged on the external wiring. The invention also discloses a working method of the equipment signal acquisition device. The beneficial effects of the invention are: according to the invention, a highly integrated single chip microcomputer is adopted to replace a PLC system, so that the requirement of a water cooling cabinet of a cooling system of a new energy automobile power exchange station is met; the single chip microcomputer is low in price and small in occupied space; compared with the existing PLC system, the highly integrated single chip microcomputer occupies small space and is low in production cost and more suitable for mass production.
Description
Technical Field
The invention belongs to the field of signal acquisition of new energy automobile power changing station equipment, and particularly relates to an equipment signal acquisition device and method of a cooling system of a new energy automobile power changing station.
Background
In an industrial field, analog quantities such as temperature, current and voltage are often controlled, and a PLC is generally used for collecting the data. However, the PLC of different types has a dedicated analog quantity acquisition module, the PLC analog quantity acquisition modules produced by different manufacturers cannot be used universally, the unit price of the PLC analog quantity acquisition modules is high, the number of paths is small, and the cost is increased.
Industrial sites are also equipped with various types of sensors. Sensor signals (e.g., voltage or current signals output by pressure sensors) cannot be transmitted over long distances, subject to industrial field conditions. Because the number of sensors is too many, the wiring is complex, and the sensors are selected to transmit data to a computer or other controllers for processing in the field.
In industrial processes, there are many analog quantities that vary continuously, such as temperature, pressure, flow, level, and velocity. In order for the programmable controller to handle analog quantities, a/D conversion and D/a conversion between analog and digital quantities must be implemented. PLC manufacturers produce matched A/D and D/A conversion modules, so that the programmable logic controllers are used for analog quantity control. In an actual working environment, analog quantity current or voltage signals output by a PLC system are often weak, and the load capacity is generally low.
The PLC system is directly used for monitoring remote execution equipment, signal attenuation and distortion are often caused by long-distance transmission, and sometimes signal errors are caused by interference of other external signals, so that normal operation of the whole system is influenced.
The water cooling cabinet of the cooling system of the new energy automobile battery replacement station is placed outdoors or indoors, the requirement on space is smaller and better, and therefore the CPU is low in price and occupies small space. But the PLC system obviously does not meet the requirement of the water cooling cabinet on the CPU, and the PLC system occupies a larger space and is more expensive.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device signal acquisition device and a method for a cooling system of a new energy automobile battery replacement station.
This kind of equipment signal pickup assembly of new energy automobile trades power station cooling system includes: the system comprises a highly integrated single chip microcomputer, an RS485 transceiver, a digital isolator, an SPIFlash memory and a frequency converter; the single chip microcomputer is electrically connected with the RS485 transceiver, the RS485 transceiver is electrically connected with the frequency converter, a digital isolator is arranged on a circuit between the single chip microcomputer and the RS485 transceiver, and the single chip microcomputer is externally connected with the SPIFlash memory; the internal wiring of the singlechip is connected with equipment of a power station cooling system through external wiring, and external switches are arranged on the external wiring;
the singlechip is used for receiving and collecting field input signals, and filtering, photoelectric isolation and level conversion are carried out on the input signals to obtain low-voltage signals; the power supply is used for controlling the on-off of the load and the external power supply by controlling the on-off of the transistor; for processing the acquired continuously varying physical quantity; the device is used for converting the digital signal into an equal-proportion current signal or voltage signal; the temperature data is used for processing the temperature data collected by the thermal resistor; the singlechip is also provided with a water-cooling acquisition module, and the water-cooling acquisition module is provided with a divider resistor and an operational amplifier; the water-cooling acquisition module is used for carrying out analog-to-digital conversion on acquired data and limiting acquired voltage within a reference voltage value;
the RS485 transceiver comprises an RS485 transmitter and an RS485 receiver, and is used for converting a transmitting signal TX from the microprocessor in the water-cooling acquisition module into a differential signal in the frequency converter communication network through the RS485 transmitter and converting the differential signal in the frequency converter communication network into a receiving signal RX of the microprocessor in the water-cooling acquisition module through the RS485 receiver;
the digital isolator is used for electrically isolating the singlechip and the RS485 transceiver, so that better anti-interference performance and system stability are achieved;
SPIFlash memory for storing data;
the frequency converter is used for receiving the instruction of the single chip microcomputer so as to control equipment of the cooling system of the power exchanging station;
and the single chip microcomputer is provided with an LED nixie tube for displaying fault code information.
Preferably, a plurality of digital input interfaces DI, a plurality of current analog input interfaces AI, a plurality of voltage analog input interfaces AU, a plurality of digital output interfaces DO, a plurality of current analog output interfaces AO, a plurality of thermal resistance temperature acquisition interfaces, an RS-485 serial port communication protocol interface, a group of EtherCAT communication interfaces and a configuration SWD program download interface are integrated on the singlechip; the EtherCAT communication interface comprises an input interface and an output interface.
Preferably, the singlechip is provided with expansion ports of a digital input interface DI and a digital output interface DO; the single chip is provided with a reset circuit and a real-time clock circuit.
Preferably, the water-cooling acquisition module is provided with an ADC (analog-to-digital converter) interface, or the water-cooling acquisition module is externally extended with an ADC chip.
Preferably, the single chip microcomputer is an STM32F407 chip, the RS485 transceiver is an MAX3485 chip, the digital isolator is an ADuM1201 chip, and the SPIFlash memory is a W25Q16 chip; the microprocessor in the water-cooling acquisition module selects a C8051F560-IQ chip.
The working method of the equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station comprises the following steps:
the singlechip acquires digital quantity signals of field power station cooling system equipment, and filters, photoelectrically isolates and converts level of continuously changing physical quantity in input signals to obtain low-voltage signals; and setting an external switch signal state; when the external switch is switched off, the single chip microcomputer cannot acquire the external switch, and when the external switch is switched off, the voltage of the external switch is transmitted to the inside of the single chip microcomputer;
the singlechip sends reading signal to the converter, and the converter returns communication signal to the singlechip: a sending signal TX from a microprocessor in the water-cooling acquisition module in the single chip microcomputer is converted into a differential signal in a frequency converter communication network through an RS485 sender, and the differential signal in the frequency converter communication network is converted into a receiving signal RX of the microprocessor in the water-cooling acquisition module in the single chip microcomputer through an RS485 receiver; if the frequency converter reads the upper limit alarm or the lower limit alarm, resetting the initial address of the read data; the singlechip controls the on-off of the load and the external power supply by controlling the on-off of the transistor;
the method comprises the following steps that a single chip microcomputer collects analog quantity signals of cooling system equipment of a power station; an ADC interface of a water-cooling acquisition module in the singlechip or an ADC digital-to-analog conversion chip arranged in an outward expansion mode converts an analog quantity signal into an equal-proportion digital quantity signal; the singlechip displays digital quantity signals through the LED nixie tube, and the singlechip stores the digital signals to the SPIFlash memory.
Preferably, the single chip microcomputer collects digital quantity signals of the field power station cooling system equipment through the digital quantity input interface DI.
Preferably, the single chip microcomputer acquires analog quantity signals of the power station cooling system equipment through a current type analog quantity input interface AI and a voltage type analog quantity input interface AU.
Preferably, the digital quantity signals include temperature data collected by the thermal resistor, as well as current, voltage, pressure, flow, level and speed data.
The invention has the beneficial effects that:
according to the invention, a highly integrated single chip microcomputer is adopted to replace a PLC system, so that the requirement of a water cooling cabinet of a cooling system of a new energy automobile power exchange station is met; the single chip microcomputer is low in price and small in occupied space; compared with the existing PLC system, the highly integrated single chip microcomputer occupies small space, is low in production cost and is more suitable for mass production.
According to the invention, the digital isolator for electrical isolation is arranged between the single chip microcomputer and the RS485 transceiver, so that better anti-interference performance and system stability are achieved.
Drawings
FIG. 1 is a schematic diagram of the equipment wiring between the single chip microcomputer and the cooling system of the power station;
fig. 2 is a schematic circuit diagram of the water-cooling acquisition module.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that modifications can be made to the invention by a person skilled in the art without departing from the principle of the invention, and these modifications and modifications also fall within the scope of the claims of the invention.
Example one
The embodiment of the application provides a new energy automobile trades equipment signal acquisition device of power station cooling system, includes: the system comprises a highly integrated single chip microcomputer, an RS485 transceiver, a digital isolator, an SPIFlash memory and a frequency converter; the single chip microcomputer is electrically connected with the RS485 transceiver, the RS485 transceiver is electrically connected with the frequency converter, a digital isolator is arranged on a circuit between the single chip microcomputer and the RS485 transceiver, and the single chip microcomputer is externally connected with the SPIFlash memory; the internal wiring of the single chip microcomputer is connected with equipment of a power station cooling system through external wiring, and external switches are arranged on the external wiring;
the singlechip is integrated with a plurality of digital input interfaces DI, a plurality of current analog input interfaces AI, a plurality of voltage analog input interfaces AU, a plurality of digital output interfaces DO, a plurality of current analog output interfaces AO, a plurality of thermal resistance temperature acquisition interfaces, an RS-485 serial port communication protocol interface, a group of EtherCAT communication interfaces and a configuration SWD program downloading interface; the EtherCAT communication interface comprises an input interface and an output interface; the singlechip is also provided with an expansion port of a digital input interface DI and an expansion port of a digital output interface DO; the singlechip is also provided with a water-cooling acquisition module, and the water-cooling acquisition module is provided with a divider resistor and an operational amplifier; the water-cooling acquisition module is provided with an ADC (analog-to-digital converter) interface, or the water-cooling acquisition module is externally provided with an ADC chip in an expansion way; the hardware interface configuration of the device signal acquisition apparatus of this embodiment is shown in table 1 below; the communication interface configuration of the device signal acquisition apparatus of the present embodiment is shown in table 2 below;
the singlechip is used for receiving and collecting field input signals, and filtering, photoelectric isolation and level conversion are carried out on the input signals to obtain low-voltage signals; the power supply is used for controlling the on-off of the load and the external power supply by controlling the on-off of the transistor; for processing the acquired continuously varying physical quantity; the device is used for converting the digital signal into an equal-proportion current signal or voltage signal; the temperature data is used for processing the temperature data collected by the thermal resistor; the water-cooling acquisition module is used for carrying out analog-to-digital conversion on acquired data and limiting the acquired voltage within a reference voltage value;
the RS485 transceiver comprises an RS485 transmitter and an RS485 receiver, and is used for converting a transmitting signal TX from the microprocessor in the water-cooling acquisition module into a differential signal in the frequency converter communication network through the RS485 transmitter and converting the differential signal in the frequency converter communication network into a receiving signal RX of the microprocessor in the water-cooling acquisition module through the RS485 receiver;
the digital isolator is used for electrically isolating the single chip microcomputer and the RS485 transceiver so as to achieve better anti-interference performance and system stability;
SPIFlash memory for storing data;
the frequency converter is specifically an AI artificial intelligent industrial regulator and is used for accurately controlling temperature, pressure, flow, liquid level, humidity and the like;
and the single chip microcomputer is provided with an LED nixie tube for displaying fault code information.
Table 1 hardware interface configuration table of device signal acquisition apparatus in embodiment one
Table 2 communication interface configuration table of device signal acquisition apparatus in the first embodiment
STM32F407 chip is selected for use to the singlechip, adopts this chip to carry out signal acquisition can satisfy following function:
1. acquisition of DI (digital input) 24V level signal input 16
2. Output DO (digital output) dry contact outputs 10
3. AI (analog input) acquisition of a total of 17
AI (analog input) 4-20mA current type inputs
AI:0-5V Voltage type input 13
4. Output AO (analog output) 2
5. Expansion port (for DI, DO)
6. Collecting 5 paths (3 paths of PT1000 and 2 paths of PT 100) of PT thermal resistor, 40.0-100.0 DEG C
7. Nixie tube fault code display function
8. 1-way collection RS485 interface
9. Equipment communication: etherCAT communication interface 1 group (one inlet and one outlet two ports)
10. External Flash, W25Q16
11. Reset circuit
12. Real-time clock circuit
13. Configuration SWD program downloading interface
Example two
On the basis of the first embodiment, the second embodiment of the application provides a working method of an equipment signal acquisition device of a cooling system of a new energy automobile battery replacement station, which comprises the following steps:
1. the singlechip acquires a digital quantity signal of the power station cooling system equipment through a digital quantity input interface DI;
the single chip microcomputer collects digital quantity signals of the power station cooling system equipment through a digital quantity input interface DI and sets an external switch signal state;
as shown in fig. 1, the external switching signals are all connected with a 24V dc power supply; when the switch is disconnected, the single chip microcomputer cannot acquire the switch, and the corresponding external switch signal state is set to be 0; when the switch is closed, the voltage of the external switch is transmitted to the inside of the single chip microcomputer, and the state of a corresponding external switch signal is set to be 1.
2. The single chip microcomputer sends a reading signal to an AI artificial intelligent industrial regulator instrument (frequency converter), and the AI artificial intelligent industrial regulator instrument (frequency converter) returns a communication signal to the single chip microcomputer; if the AI artificial intelligence industrial regulator reads the upper limit alarm or the lower limit alarm, resetting the initial address of the read data;
the reading instruction format sent by the singlechip to the AI artificial intelligence industrial regulator instrument is as follows: address + read function code + start address + read length + CRC check; the data returned to the singlechip by the AI artificial intelligence industrial regulator instrument is as follows: MODBUS address, given parameter value (SV value) of equipment instrument, actuator opening (MV value), equipment alarm state and AI artificial intelligent industrial regulator instrument parameter value to be read;
the AI artificial intelligence industrial regulator instrument is compatible with MODBUS-RTU protocol, and has the following specific settings and parameter codes:
if the H item in the parameter AF in the AI artificial intelligent industrial regulator instrument is equal to 1, then AF > =128, and the reading length is 4 words; MODBUS address without specific measurement (PV value);
reading a parameter code number 00H (SV value) (ADDR = 1), wherein data sent to an AI artificial intelligence industrial regulator instrument by the singlechip is 010300000004CRCLCRCH, wherein 01 is an address, 03 is a reading function code, 0000 is a starting address, 0004 is a reading length, and CRCLCRCH is CRC check; the data returned to the single chip microcomputer by the AI artificial intelligence industrial regulator instrument are MODBUS address 40001= pv (measured value), 40002= SV (given value), 40003= mv and alarm state, 40004= value of the read parameter (example = SV value);
if the upper limit of reading is alarmed, the initial address of the reading data is set to be 0001 (the lower limit of other parameters is 0002 by analogy), the data is 40002-40005, 40002= PV by analogy;
regarding the write function, the AI artificial intelligence industrial regulator currently only supports single write-in, and does not support batch write-in (because the batch write-in takes a lot of communication time, so that the PV value cannot be updated in time, and the real-time tracking capability of the signal acquisition device is affected), and when the write operation is executed, the instrument of the AI artificial intelligence industrial regulator is limited by the MODUBS protocol, and the instrument of the AI artificial intelligence industrial regulator does not return the measured value PV, but only returns the write-in data.
3. The single chip microcomputer collects analog quantity signals of the power station cooling system equipment through a current type analog quantity input interface AI and a voltage type analog quantity input interface AU; an ADC interface of the water-cooling acquisition module or an ADC digital-to-analog conversion chip arranged in an outward expansion mode converts the analog quantity signal into a digital quantity signal; the singlechip displays the digital quantity signal;
the ADC interface of the water-cooling acquisition module belongs to an analog-to-digital conversion interface and converts an external analog quantity signal into a digital quantity signal, and the water-cooling acquisition module belongs to a digital device and can be processed by a single chip microcomputer only by converting the analog signal into the digital quantity signal.
Many single-chip microcomputers in the current market are provided with ADC conversion interfaces, and if the ADC conversion interfaces are not available, ADC digital-to-analog conversion chips can be used for expanding;
taking voltage as an example, an ADC interface of a water-cooling acquisition module of the singlechip or an ADC digital-to-analog conversion chip arranged in an outward expansion mode converts an analog quantity signal into a digital quantity signal; the digital quantity signals are represented by 0 and 1, an ADC interface or an ADC digital-to-analog conversion chip arranged in an external expansion mode has reference voltage, the given reference voltage is 5V, and the digital quantity signals are 12 bits (wherein a plurality of bits are represented by binary, and the other bits are the digital quantity signals after the analog quantity signals are converted); the digital quantity signal of 12 bits can store the digital quantity range as follows: (binary) 000000000000-111111111111, and converting the decimal number into decimal number ranging from 0 to 212, namely 0 to 4095; that is, the reference voltage is divided into 212 parts, i.e., 4096 parts; the minimum resolution is VREF/4096, where VREF represents the input analog maximum value, i.e. binary 000000000000 represents the input analog 0V and 111111111111 represents the maximum value VREF;
as shown in fig. 2, the working power supply of the water-cooling acquisition module is 3.3V, and the reference voltage is 2.048V, so the input range of the analog quantity is 0-2.048V. If the voltage range to be acquired is larger than the reference voltage value, a resistance voltage division circuit can be used for voltage reduction or an operational amplifier can be used for reduction and the like.
The ADC interface of the water-cooling acquisition module of the single chip microcomputer or an ADC digital-to-analog conversion chip arranged in an outward expansion mode is 12 bits, namely when the input voltage is 0V, the digital quantity result converted by the single chip microcomputer is 000000000000 (binary), and when the input voltage is 2.048V, the digital quantity result converted by the single chip microcomputer is 111111111111 (binary), and the decimal is 4095. That is, the value V =2.048 × digital quantity ÷ 4095 collected by the ADC of the water-cooled collection module input voltage.
If an analog quantity voltage of 0-10V needs to be acquired for display, the voltage of 0-10V can be reduced by 5 times, a resistance voltage division circuit can be used for reducing the voltage, an operational amplifier can also be used for reducing the voltage and the like, and then the sampling port of the water-cooling acquisition module ADC can be connected to the port P2.2 of the figure 2.
The analog voltage V to be displayed is: v = result 2.048/4095 × 5; wherein the result is a digital quantity acquired by the singlechip.
Claims (9)
1. New energy automobile trades power station cooling system's equipment signal pickup assembly, its characterized in that includes: the system comprises a singlechip, an RS485 transceiver, a digital isolator, an SPIFlash memory and a frequency converter; the single chip microcomputer is electrically connected with the RS485 transceiver, the RS485 transceiver is electrically connected with the frequency converter, a digital isolator is arranged on a circuit between the single chip microcomputer and the RS485 transceiver, and the single chip microcomputer is externally connected with the SPIFlash memory; the internal wiring of the single chip microcomputer is connected with equipment of a power station cooling system through external wiring, and external switches are arranged on the external wiring;
the singlechip is used for receiving and collecting field input signals, and filtering, photoelectric isolation and level conversion are carried out on the input signals to obtain low-voltage signals; the power supply is used for controlling the on-off of the load and the external power supply by controlling the on-off of the transistor; for processing the acquired continuously varying physical quantity; the device is used for converting the digital signal into an equal-proportion current signal or voltage signal; the temperature data is used for processing the temperature data collected by the thermal resistor; the singlechip is also provided with a water-cooling acquisition module, and the water-cooling acquisition module is provided with a divider resistor and an operational amplifier; the water-cooling acquisition module is used for carrying out analog-to-digital conversion on acquired data and limiting acquired voltage within a reference voltage value;
the RS485 transceiver comprises an RS485 transmitter and an RS485 receiver and is used for converting a transmitting signal from the microprocessor in the water-cooling acquisition module into a differential signal in the frequency converter communication network through the RS485 transmitter and converting the differential signal in the frequency converter communication network into a receiving signal of the microprocessor in the water-cooling acquisition module through the RS485 receiver;
the digital isolator is used for electrically isolating the singlechip and the RS485 transceiver;
the SPI Flash memory is used for storing data;
the frequency converter is used for receiving the instruction of the single chip microcomputer so as to control equipment of the cooling system of the power exchanging station;
and the singlechip is provided with an LED nixie tube for displaying fault code information.
2. The equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station according to claim 1, wherein a plurality of digital input interfaces DI, a plurality of current analog input interfaces AI, a plurality of voltage analog input interfaces AU, a plurality of digital output interfaces DO, a plurality of current analog output interfaces AO, a plurality of thermal resistance temperature acquisition interfaces, an RS-485 serial port communication protocol interface, a group of EtherCAT communication interfaces and a configuration SWD program download interface are integrated on the single chip microcomputer; the EtherCAT communication interface comprises an input interface and an output interface.
3. The equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station as claimed in claim 2, wherein the single chip microcomputer is provided with expansion ports of a digital input interface DI and a digital output interface DO; the single chip is provided with a reset circuit and a real-time clock circuit.
4. The equipment signal acquisition device of the cooling system for the battery replacement station of the new energy automobile as claimed in claim 1, wherein the water-cooling acquisition module is provided with an ADC (analog-to-digital converter) interface, or the water-cooling acquisition module is provided with an ADC chip in an outward expansion manner.
5. The device signal acquisition device of the cooling system of the new energy automobile power conversion station is characterized in that the single chip microcomputer adopts an STM32F407 chip, the RS485 transceiver adopts an MAX3485 chip, the digital isolator adopts an ADuM1201 chip, and the SPI Flash memory adopts a W25Q16 chip; the microprocessor in the water-cooling acquisition module selects a C8051F560-IQ chip.
6. An operation method of the device signal acquisition device of the cooling system of the new energy automobile battery replacement station according to any one of claims 1 to 5, is characterized in that the operation method specifically comprises the following steps:
the singlechip acquires digital quantity signals of field power station cooling system equipment, and filters, photoelectrically isolates and converts level of continuously changing physical quantity in input signals to obtain low-voltage signals; and setting an external switch signal state; when the external switch is switched off, the single chip microcomputer cannot acquire the external switch, and when the external switch is switched off, the voltage of the external switch is transmitted to the inside of the single chip microcomputer;
the singlechip sends reading signal to the converter, and the converter returns communication signal to the singlechip: the transmitting signal from the microprocessor in the water-cooling acquisition module in the singlechip is converted into a differential signal in the communication network of the frequency converter through an RS485 transmitter, and the differential signal in the communication network of the frequency converter is converted into a receiving signal of the microprocessor in the water-cooling acquisition module in the singlechip through an RS485 receiver; if the frequency converter reads the upper limit alarm or the lower limit alarm, resetting the initial address of the read data; the singlechip controls the on-off of the load and the external power supply by controlling the on-off of the transistor;
the single chip microcomputer collects analog quantity signals of the power station cooling system equipment; an ADC interface of a water-cooling acquisition module in the singlechip or an ADC digital-to-analog conversion chip arranged in an outward expansion mode converts an analog quantity signal into an equal-proportion digital quantity signal; the single chip microcomputer displays digital quantity signals through the LED nixie tube, and the single chip microcomputer stores the digital quantity signals to the SPI Flash memory.
7. The working method of the equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station as claimed in claim 6, characterized in that: the singlechip acquires digital quantity signals of the field power station cooling system equipment through the digital quantity input interface DI.
8. The working method of the equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station as claimed in claim 6, characterized in that: the single chip microcomputer collects analog quantity signals of the power station cooling system equipment through a current type analog quantity input interface AI and a voltage type analog quantity input interface AU.
9. The working method of the equipment signal acquisition device of the cooling system of the new energy automobile battery replacement station as claimed in claim 6, characterized in that: the digital quantity signals comprise temperature data collected by the thermal resistor, and current, voltage, pressure, flow, liquid level and speed data.
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| CN105892394A (en) * | 2016-06-01 | 2016-08-24 | 松下制冷（大连）有限公司 | Bus controller with redundant digital temperature sensors for refrigerating system |
| CN114340345A (en) * | 2021-12-28 | 2022-04-12 | 广州高澜节能技术股份有限公司 | Integrated controller for cooling system of high-power electronic device |
| CN217213478U (en) * | 2022-04-07 | 2022-08-16 | 大连冰山嘉德自动化有限公司 | Refrigeration plant IoT centralized monitoring system |
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Application publication date: 20221111 |