CN207706465U - A kind of air heating controller - Google Patents

Abstract

The utility model provides a kind of air heating controller, is related to air technical field of heating, including electrical heating controller, electric heating wire and PT100 temperature sensors；Wherein, air heating controller includes ARM controller, power module, R/V conversion modules, heating wire driving chip and CAN communication module；Power module includes DC/DC converters and LDO voltage stabilizer；ARM controller heats electric heating wire by controlling heating wire driving chip；PT100 temperature sensors are used to acquire the temperature information of heated material and temperature information are sent to ARM controller by R/V conversion modules；DC/DC converters are connected to LDO voltage stabilizer, for providing electric energy for ARM controller, heating wire driving chip and R/V conversion modules；CAN communication module is used to the ARM controller in multiple electric heating systems being connected into looped network.

Description

A kind of air heating controller

Technical field

The utility model is related to electric-heating technology fields, in particular to a kind of air electrical heating controller.

Background technology

Currently, need to use electrical heating controller in many scenes, such as：Process equipment, low temperature environment and other need It is maintained at the instrument or equipment of specific range of temperatures.Existing electrical heating controller is mostly complicated, difficult in maintenance, uncomfortable It should use in the presence of a harsh environment, the especially general function of not having monitoring feedback and accurately heat, or the monitoring to environment It is more single, just right heating cannot be accurately carried out to heated material.

Utility model content

The purpose of this utility model is to provide a kind of air heating controllers, aim to solve the problem that existing electric heating control The technical problem that device is complicated, computer heating control is not accurate.

The utility model provides a kind of technical solution：A kind of air heating controller includes electrical heating controller, electrical heating Silk and PT100 temperature sensors；Wherein, the electrical heating controller include ARM controller, power module, R/V conversion modules, Heating wire driving chip and CAN communication module；The power module includes DC/DC converters and LDO voltage stabilizer；

The electric heating wire is connected to the heating wire driving chip, and the heating wire driving chip is connected to the ARM Controller, the ARM controller heat the electric heating wire by controlling the heating wire driving chip, the electric heating wire For being wrapped in heated material.

Preferably, the PT100 temperature sensors are connected to the R/V conversion modules, and the R/V conversion modules are connected to The ARM controller, the PT100 temperature sensors are used to acquire the temperature information of heated material and are turned by the R/V Temperature information is sent to the ARM controller by mold changing block.

Preferably, the DC/DC converters are connected to the LDO voltage stabilizer, and the LDO voltage stabilizer is connected to the ARM Controller, the heating wire driving chip and the R/V conversion modules, for being driven for the ARM controller, the heating wire Dynamic chip and the R/V conversion modules provide electric energy.

Preferably, the CAN communication module is connected to the ARM controller, and the CAN communication module is used for multiple institutes It states the ARM controller in electrical heating controller and is connected into looped network, and for connecting host computer, the ARM controller is adopted The information of collection is interacted with host computer.

Preferably, the ARM controller is using the serial 32 bit flash memory micro-controls of the STM32 based on ARM Cortex-M3 kernels Device processed.

Preferably, the heating wire driving chip uses DRV102F driving chips.

The advantageous effect of electrical heating controller provided by the utility model is：

A kind of air heating controller provided by the utility model can be used in adverse circumstances, and applicability is high, and practicality can It leans on, is durable, is easy to use, is easy to maintain, is easy to disassemble, overall performance is excellent, moreover, being capable of Real-time Feedback material to be heated The temperature of body, to accurately be heated to electric heating wire under the control of ARM controller.

Description of the drawings

It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also To obtain other relevant attached drawings according to these attached drawings.

Fig. 1 is a kind of function composition frame chart for air heating controller that the utility model embodiment provides；

Fig. 2 is the connection diagram for the four-wire system connection that PT100 temperature sensors use in Fig. 1；

Fig. 3 is the connection diagram for the modulate circuit that PT100 temperature sensors use in Fig. 1；

Fig. 4 is the function composition frame chart of heating wire driving chip in Fig. 1；

Fig. 5 is the connection diagram of heating wire driving chip and ARM controller and electric heating wire in Fig. 1；

Fig. 6 is the function composition frame chart of CAN communication module in Fig. 1.

Icon：Electrical heating controller 100；ARM controller 110, R/V conversion modules 120, heating wire driving chip 130； CAN communication module 140；DC/DC converters 150；LDO voltage stabilizer 160；Electric heating wire 170；PT100 temperature sensors 180.

Specific implementation mode

It is new below in conjunction with this practicality to keep the purpose, technical scheme and advantage of the utility model embodiment clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments, usually here described in attached drawing and The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.

Therefore, the detailed description of the embodiments of the present invention to providing in the accompanying drawings is not intended to limit requirement below The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model, based in the utility model Embodiment, the every other embodiment that those of ordinary skill in the art are obtained without creative efforts, all Belong to the range of the utility model protection.

It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.

Fig. 1 is a kind of function composition frame chart for air heating controller 100 that the utility model embodiment provides, and is please referred to Fig. 1 present embodiments provides a kind of air heating controller 100；Air heating controller 100 includes electrical heating controller, electricity Heater strip 170 and PT100 temperature sensors 180；Wherein, electrical heating controller includes ARM controller 110, power module, R/V Conversion module 120, heating wire driving chip 130 and CAN communication module 140, power module include DC/DC converters 150 and LDO Voltage-stablizer 160.

Electric heating wire 170 is connected to heating wire driving chip 130, and heating wire driving chip 130 is connected to ARM controller 110, ARM controller 110 heats electric heating wire 170 by controlling heating wire driving chip 130, and electric heating wire 170 is for twining It is wound in heated material.

ARM controller 110 selects the STM32 based on ARM Cortex-M3 kernels that ST Microelectronics (ST) produces Serial 32 digit flash memory microcontrollers（Referred to as " STM32 chips "）, STM32 chips have lower power consumption, and core voltage is 1.8V, chip voltage 3.3V can select sleep pattern, standby mode, ensure the requirement of low-power consumption application；Relative to ARM Series other chips, faster, working frequency reaches as high as 72MHz to the STM32 chips speed of service, it includes 8 timers 28 channel pwm signals can be at most generated, the control of solenoid valve 170 is conveniently used for；It connects with USB, the communications such as CAN and serial ports Mouthful, it can be communicated with multiple communication interface, also include the 12-bit digital-to-analog converter of 3 12 analog-to-digital conversion devices and 2 channels.

ARM controller 110 mainly completes following functions：

1）To the power control of electric heating wire 170；

2）Collect the temperature information of the measurement of PT100 temperature sensors 180, the heating power of Real-time Feedback electric heating wire 170；

3）It is communicated with host computer.

Electric heating wire 170 selects import Teflon heating wire, surface to have transparent insulating layer, heating wire nominal supply voltages For 48V, power is up to 200W, and resistance is chosen for 15 Europe or so, and electric heating wire 170 is fitted closely with heated material, and electricity adds The heating surface of heated filament 170 promotes heat conduction, radiating surface to carry out isothermal holding using heat-barrier material using heat-conducting glue.

Heating wire driving chip 130 selects the DRV102F driving chips of Texas Instruments to control electrical heating Silk 170 heats.The loaded work piece voltage of DRV102F driving chips is 8V to 60 V, maximum output current 2A, and lower Conducting internal resistance can guarantee that current limliting overtemperature prote is realized in low-power consumption, the included error protection in inside again；DRV102F driving chips（Electric heating Silk driving chip 130）Function composition frame chart it is as shown in Figure 4；DRV102F driving chips（Heating wire driving chip 130）With ARM The connection diagram of controller 110 and electric heating wire 170 is as shown in Figure 5；In Fig. 5, DRV102 chips are realized by pin 1 to defeated The adjusting for going out OUT voltages, to realize the supply voltage variation to electric heating wire 170；INA138 chips or INA168 chips are realized Detection to heating wire operating current, to realize the monitoring to electrical heating power.

PT100 temperature sensors 180 are connected to R/V conversion modules 120, and R/V conversion modules 120 are connected to ARM controller 110, PT100 temperature sensors 180 are used to acquire the temperature information of heated material and by R/V conversion modules 120 by temperature Information is sent to ARM controller 110.

PT100 temperature sensors 180 are thermal resistance sensor, and PT100 temperature sensors 180 are surveyed using four-wire system Amount, four-wire system connection is as shown in Fig. 2, circuit loop and voltage measurement circuit are independently separated, high certainty of measurement；PT100 temperature passes Sensor 180 is measured using constant current drive method, and the modulate circuit used is by constant-current source circuit and filtering and amplifying circuit two It is grouped as, as shown in Figure 3；Constant-current source circuit exports a constant electric current, as the driving source of PT100 temperature sensors 180, Size of current is 1.2mA, is amplified using single-stage, and amplification factor is 20 times, and small-signal is amplified to suitable voltage range, is filtered Wave device filters for RC, and common mode low-pass filtering cutoff frequency is 80Hz.

Improve the relationship of output voltage and PT100 temperature sensors 180：Vout=1.2mA*R*20, for ± 50 DEG C of ranges Temperature, for conditioning voltage output within the scope of 1.9V to 2.87V, every 0.2 DEG C of temperature change generates 1.85mV voltage changes, utilizes STM32 chips（ARM controller 110）12 included bit A/D converters are acquired, and meet 0.2 DEG C of acquisition precision, and actual measurement is surveyed Accuracy of measurement reaches ± 0.15 DEG C.

The temperature information that PT100 temperature sensors 180 acquire is resistance value signal, and R/V conversion modules 120 are by PT100 temperature The resistance signal that degree sensor 180 acquires is converted into voltage value signal, to be identified by ARM controller 110；R/V conversion modules 120 can also overcome by the measurement error caused by input lead.

DC/DC converters 150 are connected to LDO voltage stabilizer 160, and LDO voltage stabilizer 160 is connected to ARM controller 110, electric heating Silk driving chip 130 and R/V conversion modules 120, for turning for ARM controller 110, heating wire driving chip 130 and R/V It changes the mold block 120 and electric energy is provided.

Power module uses the combination of DC/DC converters 150 and LDO voltage stabilizer 160, realizes to being needed in ARM controller 110 The power supply power supplies such as 24V, 5V, the 3.3V wanted；According to the estimation for loading required electric current in ARM controller 110, DC/DC converters 150 It is one chip, binary channels tracking, 3A step down switching voltage regulators to select the LT3992 of Linear Tech, LT3992；It is defeated with width Enter range 3V to 60V；Adjustable/the fixing frequency operation that can synchronize of tool synchronised clock output：250kHz to 2MHz；Flexibly Output voltage tracking；Low voltage difference：95% maximum duty cycle.

LDO voltage stabilizer 160 selects the positive adjustable voltage stabilizer of LT1083 series, to provide 3A output currents, all internal electricity Road can down to 1V be input to output difference voltage conditions under operate, pressure difference ensures under the conditions of maximum output current For 1.5V (maximum value), and reduced in relatively low load current, in chip finishing output voltage accuracy is adjusted to 1%.Current limit is also modified, is held on voltage-stablizer and power circuit under overload condition to reduce to the maximum extent The stress received.

CAN communication module 140 is connected to ARM controller 110, and CAN communication module 140 is used for multiple air computer heating controls ARM controller 110 in device 100 is connected into looped network, and for connecting host computer, the information that ARM controller 110 is acquired with it is upper Position machine interacts；CAN communication module 140 uses TJA1050 chips, function composition frame chart such as Fig. 6 of CAN communication module 140 It is shown；Each heated material corresponds to an ARM controller 110, is corresponded to by topological structure automatic identification ARM controller 110 The number of heated material.

When a kind of air heating controller 100 provided in this embodiment can detect that ambient temperature is less than -20 DEG C, lead to It crosses electric heating wire 170 to heat heated material, it is ensured that return testing temperature and be higher than setting value；ARM controller 110 can use CAN Bus mode connects, and forms looped network, and in heated material, each heated material corresponds to an ARM controller 110, pass through 110 corresponding heated material of topological structure automatic identification ARM controller；ARM controller 110 has 1 road PT100 180 Measurement channel of temperature sensor, using four-line measurement mode, ranging from -50 DEG C to 50 DEG C of measuring temperature, measurement accuracy 0.2℃。

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention, all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (3)

1. a kind of air heating controller, it is characterised in that：The air heating controller includes electrical heating controller, electrical heating Silk and PT100 temperature sensors；Wherein, the electrical heating controller include ARM controller, power module, R/V conversion modules, Heating wire driving chip and CAN communication module；The power module includes DC/DC converters and LDO voltage stabilizer；

The electric heating wire is connected to the heating wire driving chip, and the heating wire driving chip is connected to the ARM controls Device, the ARM controller heat the electric heating wire by controlling the heating wire driving chip, and the electric heating wire is used for It is wrapped in heated material；

The PT100 temperature sensors are connected to the R/V conversion modules, and the R/V conversion modules are connected to the ARM controls Device, the PT100 temperature sensors are used to acquire the temperature information of heated material and will be warm by the R/V conversion modules Degree information is sent to the ARM controller；

The DC/DC converters are connected to the LDO voltage stabilizer, and the LDO voltage stabilizer is connected to the ARM controller, described Heating wire driving chip and the R/V conversion modules, for for the ARM controller, the heating wire driving chip and The R/V conversion modules provide electric energy；

The CAN communication module is connected to the ARM controller, and the CAN communication module is used for multiple electrical heating controls The ARM controller in device processed is connected into looped network, and for connecting host computer, the information that the ARM controller is acquired with Host computer interacts.

2. a kind of air heating controller according to claim 1, it is characterised in that：The ARM controller is used and is based on Serial 32 digit flash memory microcontrollers of the STM32 of ARM Cortex-M3 kernels.

3. a kind of air heating controller according to claim 1, it is characterised in that：The heating wire driving chip uses DRV102F driving chips.