CN103970162B - The heater of a kind of cylindrical coaxial resonant cavity and temperature-controlled process thereof - Google Patents
The heater of a kind of cylindrical coaxial resonant cavity and temperature-controlled process thereof Download PDFInfo
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- CN103970162B CN103970162B CN201410188119.6A CN201410188119A CN103970162B CN 103970162 B CN103970162 B CN 103970162B CN 201410188119 A CN201410188119 A CN 201410188119A CN 103970162 B CN103970162 B CN 103970162B
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Abstract
The invention discloses heater and the temperature-controlled process thereof of a kind of cylindrical coaxial resonant cavity, device includes control unit, temperature collecting cell, power heating unit, and method includes that temperature acquisition, temperature compare, temperature statistics, temperature adjust several steps.The present invention flows through the drain electrode of MOSFET pipe by change and the electric current of source class controls the size of heating power and meets heating process requirement controlled, uniform, is effectively reduced operating temperature to the impact of resonant frequency, the precision that improves the detection of material wet density.
Description
Technical field
The present invention relates to heater field, the heater of a kind of cylindrical coaxial resonant cavity and temperature thereof
Control method.
Background technology
During utilizing Resonant-cavity Method that material is carried out wet density detection, stablizing to measuring accuracy extremely of resonant frequency
Close important；And due to the thermal expansion effects of cavity material, cause size and experimental temperature, the coefficient of thermal expansion phase of material of resonator
Closing, therefore the cavity resonance frequency of resonator will change due to operating temperature and the different of fiducial temperature.So in order to really
Protect measuring accuracy, need resonant cavity to be heated and keeps temperature constant, and quenching should be avoided in heating process rapid
Heat keeps the heating process of uniform, controllable.
Existing heating control circuit, it is common that utilize the on-off action of PWM ripple to carry out heating process control.Adopt merely
When carrying out the control of heating power with PWM ripple, heater circuit heating with full power during PWM wave height level, heat is big；The low electricity of PWM ripple
Do not heat, control process inertia bigger, it is impossible to the most accurately control heating-up temperature and heating process cannot keep
Uniformly.
Therefore, for reducing operating temperature, the impact of resonant frequency is improved measuring accuracy, how to obtain controlled uniformly adding
Thermal process, is those skilled in the art's technical issues that need to address.
Summary of the invention it is an object of the invention to provide heater and the temperature thereof of a kind of cylindrical coaxial resonant cavity
Control method, controlling by changing continuously the electric current flowing through the drain electrode of MOSFET pipe and source class that the size of heating power meets can
Control, uniform heating process requirement.
In order to achieve the above object, the technical solution adopted in the present invention is:
Plant the heater of cylindrical coaxial resonant cavity, it is characterised in that: include control unit, temperature acquisition list
Unit, power heating unit, described temperature collecting cell and power heating unit are connected with control unit respectively；
Described temperature collecting cell be located on cylindrical coaxial resonant cavity fluting in, and with cylindrical coaxial resonant cavity
Closely thermal conductive contact；
Described control unit includes controlling voltage generating subunit, filtering adjusts subelement, wherein controls voltage and produces son
Unit is made up of the DA conversion chip of main control chip, access main control chip, and filtering adjusts what subelement was made up of operational amplifier
Filter circuit, proportional integral circuit constitute, described temperature collecting cell output signal access main control chip, main control chip according to
The signal of temperature collecting cell output, controls DA conversion chip and produces control voltage signal, the control electricity that DA conversion chip produces
Pressure signal accesses filtering and adjusts subelement, sequentially passes through filtering and adjusts filter circuit filtering, proportional integral circuit ratio in subelement
After example integral transformation, it is transformed to power control voltage signal access power heating unit；
Described power heating unit includes that two power MOSFET tubes, two power MOSFET tubes are distributed in cylindrical coaxial
Resonant cavity top and bottom, and thermal conductive contact tight with cylindrical coaxial resonant cavity respectively, two power MOSFET tubes divide
In other reception control unit, filtering adjusts the power control voltage signal of subelement output, power control voltage signal control two
Individual power MOSFET tube is inducted the width of raceway groove, to adjust the size of electric current between drain electrode and source electrode, completes heating power big
Little control.
The heater of described a kind of cylindrical coaxial resonant cavity, it is characterised in that: described temperature collecting cell is adopted
With high-precision digital temperature-sensitive integrated circuit, temperature collecting cell output is by controlling electricity in universal serial bus Access Control unit
Press the main control chip of generating subunit, and temperature collecting cell is arranged on cylindrical coaxial resonant cavity fluting by heat conductive pad
In.
The heater of described a kind of cylindrical coaxial resonant cavity, it is characterised in that: described filtering adjusts subelement
The filter circuit, the proportional integral circuit that are made up of operational amplifier are constituted, wherein:
Filter amplification circuit includes operational amplifier U1, and the control voltage signal that DA conversion chip produces sequentially passes through series connection
Resistance R1, resistance R2 access the inverting input of operational amplifier U1, by electric capacity C1 ground connection between resistance R1 and resistance R2,
The in-phase input end ground connection of operational amplifier U1, is connected to resistance R3 between inverting input and the output of operational amplifier U1；
Proportional integral circuit includes operational amplifier U2, U3, and the output of operational amplifier U1 accesses fortune by resistance R4
Calculating the inverting input of amplifier U2, the output of operational amplifier U1 accesses the anti-phase of operational amplifier U3 also by resistance R5
Input, the in-phase input end ground connection of operational amplifier U2, access between inverting input and the output of operational amplifier U2
The in-phase input end ground connection of electric capacity C2, operational amplifier U3, accesses between inverting input and the output of operational amplifier U3
Electric capacity C3, the output of operational amplifier U2 is respectively connected to by resistance R7 by the output of resistance R6, operational amplifier U3
Power heating unit, to export two-way power control voltage signal to power heating unit.
The heater of described a kind of cylindrical coaxial resonant cavity, it is characterised in that: described power heating unit bag
Including two power MOSFET tubes T1, T2, two power MOSFET tubes T1, T2 are respectively by smearing heat-conducting silicone grease screwing and circle
Cylindrical coaxial resonant cavity top, bottom correspondence are in close contact, the source electrode of two power MOSFET tubes T1, T2 ground connection respectively, leakage
Pole is respectively connected to power supply VCC, and the grid of one of them power MOSFET tube T1 is connect by resistance R9 respectively by resistance R8, source electrode
Enter filtering and adjust the power control voltage signal of a proportional integral circuit wherein road output, another power MOSFET in subelement
The grid of pipe T2 by resistance R10, source electrode by resistance R11 be respectively connected to filtering adjust in subelement proportional integral circuit another
The power control voltage signal of road output.
A kind of temperature-controlled process of cylindrical coaxial resonant cavity, it is characterised in that: comprise the following steps:
(1), temperature acquisition step: measured the temperature of heated cylindrical coaxial resonant cavity by temperature collecting cell
Degree；
(2), temperature comparison step: by the cylinder measured by main control chip C.T collecting unit in control unit
Coaxial resonant cavity temperature and the difference of target temperature and the temperature gap of adjacent twice collection；
(3), temperature statistics step: by main control chip in control unit to each cylindrical coaxial resonant cavity gathered
Temperature adds up with the difference of target temperature；
(4), temperature adjustment steps: when the temperature of this cylindrical coaxial resonant cavity is less than this target temperature, by control
Unit processed calculates generation power control voltage signal and adjusts the size of heating power.
Beneficial effects of the present invention:
The present invention provides a kind of heater circuit for cylindrical coaxial resonant cavity and temperature-controlled process thereof, by changing
Unsteady flow controls the size of heating power through the drain electrode of MOSFET pipe and the electric current of source class and wants to meet heating process controlled, uniform
Ask, be effectively reduced operating temperature to the impact of resonant frequency, the precision that improves the detection of material wet density.
Accompanying drawing explanation
Fig. 1 is the block schematic diagram of the heater circuit of the present invention.
Fig. 2 is the block schematic diagram controlling voltage generating subunit of the present invention.
Fig. 3 is the block schematic diagram of the filtering adjustment subelement of the present invention.
Fig. 4 is the block schematic diagram of the power heating unit of the present invention.
Fig. 5 is temperature collecting cell and the power heating unit installation site schematic diagram of the present invention.
Fig. 6 is the flow chart of the temperature-controlled process of the present invention.
Detailed description of the invention
As Figure 1-Figure 5, the heater of a kind of cylindrical coaxial resonant cavity, include control unit 102, temperature
Collecting unit 101, power heating unit 103, temperature collecting cell 101 and power heating unit 103 respectively with control unit 102
Connect；
Temperature collecting cell 101 be located on cylindrical coaxial resonant cavity fluting in, and with cylindrical coaxial resonant cavity
Closely thermal conductive contact；
Control unit 102 includes controlling voltage generating subunit 201, filtering adjusts subelement 202, wherein controls voltage and produces
Raw subelement 201 is made up of the DA conversion chip 302 of main control chip 301, access main control chip 301, and filtering adjusts subelement 202
The filter circuit, the proportional integral circuit that are made up of operational amplifier are constituted, and the signal of temperature collecting cell 101 output accesses master control
Chip 301, the signal that main control chip 301 exports according to temperature collecting cell 101, control DA conversion chip 302 and produce control electricity
Pressure signal, the control voltage signal that DA conversion chip 302 produces accesses filtering and adjusts subelement 202, sequentially passes through filtering and adjusts
After filter circuit filtering in subelement 202, the conversion of proportional integral circuit proportional integral, it is transformed to power control voltage signal and connects
Enter power heating unit 103；
Power heating unit 103 includes that two power MOSFET tubes, two power MOSFET tubes are distributed in cylindrical coaxial
Resonant cavity top and bottom, and thermal conductive contact tight with cylindrical coaxial resonant cavity respectively, two power MOSFET tubes divide
In other reception control unit 102, filtering adjusts the power control voltage signal of subelement 202 output, by power control voltage signal
Control two power MOSFET tubes to induct the width of raceway groove, to adjust the size of electric current between drain electrode and source electrode, complete heating
The control of watt level.
Temperature collecting cell 101 uses high-precision digital temperature-sensitive integrated circuit, temperature collecting cell 101 output to pass through
Universal serial bus Access Control unit 102 controls the main control chip of voltage generating subunit 201, and temperature collecting cell 101 leads to
Cross heat conductive pad to be arranged on cylindrical coaxial resonant cavity in fluting.
Filter circuit, proportional integral circuit that filtering adjustment subelement 202 is made up of operational amplifier are constituted, wherein:
Filter amplification circuit includes operational amplifier U1, and the control voltage signal that DA conversion chip produces sequentially passes through series connection
Resistance R1, resistance R2 access the inverting input of operational amplifier U1, by electric capacity C1 ground connection between resistance R1 and resistance R2,
The in-phase input end ground connection of operational amplifier U1, is connected to resistance R3 between inverting input and the output of operational amplifier U1；
Proportional integral circuit includes operational amplifier U2, U3, and the output of operational amplifier U1 accesses fortune by resistance R4
Calculating the inverting input of amplifier U2, the output of operational amplifier U1 accesses the anti-phase of operational amplifier U3 also by resistance R5
Input, the in-phase input end ground connection of operational amplifier U2, access between inverting input and the output of operational amplifier U2
The in-phase input end ground connection of electric capacity C2, operational amplifier U3, accesses between inverting input and the output of operational amplifier U3
Electric capacity C3, the output of operational amplifier U2 is respectively connected to by resistance R7 by the output of resistance R6, operational amplifier U3
Power heating unit, to export two-way power control voltage signal to power heating unit.
Power heating unit 103 includes that two power MOSFET tubes T1, T2, two power MOSFET tubes T1, T2 lead to respectively
Cross and smear heat-conducting silicone grease screwing and cylindrical coaxial resonant cavity top, the corresponding close contact in bottom, two power
The source electrode of MOSFET pipe T1, T2 ground connection respectively, drain electrode is respectively connected to power supply VCC, the grid of one of them power MOSFET tube T1
It is respectively connected to filtering by resistance R8, source electrode by resistance R9 and adjusts the merit of a proportional integral circuit wherein road output in subelement
Rate controls voltage signal, and the grid of another power MOSFET tube T2 is respectively connected to by resistance R11 by resistance R10, source electrode
Filtering adjusts the power control voltage signal of another road of proportional integral circuit output in subelement.
As shown in Figure 6, the temperature-controlled process of a kind of cylindrical coaxial resonant cavity, comprise the following steps:
(1), temperature acquisition step: measured the temperature of heated cylindrical coaxial resonant cavity by temperature collecting cell
Degree；
(2), temperature comparison step: by the cylinder measured by main control chip C.T collecting unit in control unit
Coaxial resonant cavity temperature and the difference of target temperature and the temperature gap of adjacent twice collection；
(3), temperature statistics step: by main control chip in control unit to each cylindrical coaxial resonant cavity gathered
Temperature adds up with the difference of target temperature；
(4), temperature adjustment steps: when the temperature of this cylindrical coaxial resonant cavity is less than this target temperature, by control
Unit processed calculates generation power control voltage signal and adjusts the size of heating power.
In conjunction with Fig. 1, the heater circuit of the present invention mainly includes temperature collecting cell 101, control unit 102 and power heating
Unit 103.Control unit 102 includes controlling voltage generating subunit 201 and filtering adjusts subelement 202, passes through universal serial bus
It is connected with temperature collecting cell, receives the temperature value of the resonant cavity collected, by controlling voltage generating subunit 201 through meter
Calculate to produce and control voltage filtered adjustment subelement 202 and be filtered integration to adjust output single to power heating controlling voltage
Unit 103 completes the regulation of heating power size.
In conjunction with Fig. 2, the control voltage generating subunit 201 of the present invention is main by main control chip 301 and DA conversion chip 302
Composition.The temperature value that main control chip 301 is collected by universal serial bus reception temperature collecting cell 101 controls through calculating output
DA conversion chip 302, is produced control voltage signal by DA conversion chip 302.
In conjunction with Fig. 3, the control voltage signal of generation accesses filtering and adjusts subelement 202, is integrated adjusting after filtering it
It is whole for the control voltage of MOSFET pipe heating power in power heating unit 103 can be controlled.
In conjunction with Fig. 4, the power heating unit 103 of the present invention includes two power MOSFET tubes, and control unit 102 produces
The grid of power computer heating control voltage access power MOSFET pipe, can adjust MOSFET pipe and induct the width of passage, Jin Erke
The electric current drained with source class to adjust MOSFET pipe to flow through, thus complete the control to MOSFET pipe heating power size.
In conjunction with Fig. 5, temperature collecting cell 101 uses high-precision digital temperature-sensitive integrated circuit, in resonant cavity bottom
Fluting is in close contact with resonant cavity by heat conductive pad, for gathering the temperature of resonant cavity；It is subject in order to ensure resonant cavity
Heat uniformly, two power MOSFET tubes, be distributed in two parts up and down of resonant cavity, by smear heat-conducting silicone grease screwing with
Resonant cavity is in close contact.
In conjunction with Fig. 6, the temperature-controlled process in the present invention is broadly divided into four steps: temperature acquisition step, temperature compare
Step, temperature statistics step and temperature adjustment steps.Temperature acquisition step is measured heated with described temperature collecting cell 101
The temperature of resonant cavity；Temperature comparison step is with the relatively described temperature acquisition list of 102 main control chips 301 in described control unit
Unit's resonant cavity temperature measured by 101 and the difference of target temperature and the temperature gap of adjacent twice collection；Temperature statistics
Step is that the difference to the resonant cavity temperature gathered with target temperature every time adds up；Temperature adjustment steps is to catch up with to state three
Individual step, this cavity temperature less than this target temperature, close to target temperature and slightly above target temperature time, single by controlling
Unit calculates and produces power control voltage signal and adjust the size of heating power, and resonant cavity carries out total power, half-power, micro-
Power heats and does not heats.
Claims (2)
1. the heater of a cylindrical coaxial resonant cavity, it is characterised in that: include control unit, temperature acquisition list
Unit, power heating unit, described temperature collecting cell and power heating unit are connected with control unit respectively；Described temperature is adopted
Collection unit is located on cylindrical coaxial resonant cavity in fluting, and thermal conductive contact tight with cylindrical coaxial resonant cavity；
Described control unit includes controlling voltage generating subunit, filtering adjusts subelement, wherein controls voltage generating subunit
Being made up of the DA conversion chip of main control chip, access main control chip, filtering adjusts the filtering that subelement is made up of operational amplifier
Circuit, proportional integral circuit are constituted, and the signal of described temperature collecting cell output accesses main control chip, and main control chip is according to temperature
The signal of collecting unit output, controls DA conversion chip and produces control voltage signal, the control voltage letter that DA conversion chip produces
Number accessing filtering adjusts subelement, sequentially passes through filtering and adjusts filter circuit filtering, proportional integral circuit ratio in subelement and amass
After dividing conversion, it is transformed to power control voltage signal access power heating unit；
Described power heating unit includes that two power MOSFET tubes, two power MOSFET tubes are distributed in cylindrical coaxial resonance
Cavity top and bottom, and thermal conductive contact tight with cylindrical coaxial resonant cavity respectively, two power MOSFET tubes connect respectively
Receive filtering in control unit and adjust the power control voltage signal of subelement output, power control voltage signal control two merits
Rate MOSFET pipe is inducted the width of raceway groove, to adjust the size of electric current between drain electrode and source electrode, completes heating power size
Control；
Described temperature collecting cell uses high-precision digital temperature-sensitive integrated circuit, and temperature collecting cell output is total by serial
Line Access Control unit controls the main control chip of voltage generating subunit, and temperature collecting cell is arranged on circle by heat conductive pad
On cylindrical coaxial resonant cavity in fluting；
Filter circuit, proportional integral circuit that described filtering adjustment subelement is made up of operational amplifier are constituted, wherein: filtering
Amplifying circuit includes operational amplifier U1, and the control voltage signal that DA conversion chip produces sequentially passes through the resistance R1 of series connection, electricity
Resistance R2 accesses the inverting input of operational amplifier U1, by electric capacity C1 ground connection between resistance R1 and resistance R2, operational amplifier
The in-phase input end ground connection of U1, is connected to resistance R3 between inverting input and the output of operational amplifier U1；Proportional integral electricity
Road includes operational amplifier U2, U3, and the output of operational amplifier U1 accesses the anti-phase defeated of operational amplifier U2 by resistance R4
Entering end, the output of operational amplifier U1 accesses the inverting input of operational amplifier U3, operational amplifier also by resistance R5
The in-phase input end ground connection of U2, accesses electric capacity C2, operational amplifier between inverting input and the output of operational amplifier U2
The in-phase input end ground connection of U3, accesses electric capacity C3, operational amplifier between inverting input and the output of operational amplifier U3
The output of U2 is respectively connected to power heating unit by the output of resistance R6, operational amplifier U3 by resistance R7, with to
Power heating unit output two-way power control voltage signal；
Described power heating unit includes two power MOSFET tubes T1, T2, and two power MOSFET tubes T1, T2 are respectively by being coated with
Smear heat-conducting silicone grease screwing and cylindrical coaxial resonant cavity top, the corresponding close contact in bottom, two power MOSFET tubes
The source electrode of T1, T2 ground connection respectively, drain electrode is respectively connected to power supply VCC, and the grid of one of them power MOSFET tube T1 passes through resistance
R8, source electrode are respectively connected to filtering by resistance R9 and adjust the power control electricity of a proportional integral circuit wherein road output in subelement
Pressure signal, the grid of another power MOSFET tube T2 is respectively connected to filtering by resistance R10, source electrode by resistance R11 and adjusts
The power control voltage signal of another road of proportional integral circuit output in subelement.
2. based on a temperature-controlled process for the heater of cylindrical coaxial resonant cavity described in claim 1, its feature
It is: comprise the following steps:
(1), temperature acquisition step: measured the temperature of heated cylindrical coaxial resonant cavity by temperature collecting cell；
(2), temperature comparison step: by the cylindrical coaxial measured by main control chip C.T collecting unit in control unit
Resonant cavity temperature and the difference of target temperature and the temperature gap of adjacent twice collection；
(3), temperature statistics step: by main control chip in control unit to each cylindrical coaxial resonant cavity temperature gathered
Add up with the difference of target temperature；
(4), temperature adjustment steps: when the temperature of this cylindrical coaxial resonant cavity is less than this target temperature, single by controlling
Unit calculates generation power control voltage signal and adjusts the size of heating power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410188119.6A CN103970162B (en) | 2014-05-06 | 2014-05-06 | The heater of a kind of cylindrical coaxial resonant cavity and temperature-controlled process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410188119.6A CN103970162B (en) | 2014-05-06 | 2014-05-06 | The heater of a kind of cylindrical coaxial resonant cavity and temperature-controlled process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103970162A CN103970162A (en) | 2014-08-06 |
| CN103970162B true CN103970162B (en) | 2016-08-24 |
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| CN201444143U (en) * | 2009-07-10 | 2010-04-28 | 中国科学院沈阳自动化研究所 | Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method |
| CN101751052A (en) * | 2008-12-17 | 2010-06-23 | 比亚迪股份有限公司 | Microheater |
| CN102204403A (en) * | 2011-05-17 | 2011-09-28 | 华为技术有限公司 | An electronic heater and a control method thereof |
| CN102360047A (en) * | 2011-08-31 | 2012-02-22 | 深圳市江波龙电子有限公司 | High-temperature aging test instrument and constant-temperature control method thereof |
| CN202405738U (en) * | 2011-12-07 | 2012-08-29 | 深圳市正弦电气有限公司 | Frequency converter and three-phase output over-current protection circuit thereof |
-
2014
- 2014-05-06 CN CN201410188119.6A patent/CN103970162B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005124383A1 (en) * | 2004-06-08 | 2005-12-29 | Thales | Method for transmitting a radio navigation signal |
| CN101751052A (en) * | 2008-12-17 | 2010-06-23 | 比亚迪股份有限公司 | Microheater |
| CN201444143U (en) * | 2009-07-10 | 2010-04-28 | 中国科学院沈阳自动化研究所 | Device for rapidly detecting non-metallic material density by using resonant cavity perturbation method |
| CN102204403A (en) * | 2011-05-17 | 2011-09-28 | 华为技术有限公司 | An electronic heater and a control method thereof |
| CN102360047A (en) * | 2011-08-31 | 2012-02-22 | 深圳市江波龙电子有限公司 | High-temperature aging test instrument and constant-temperature control method thereof |
| CN202405738U (en) * | 2011-12-07 | 2012-08-29 | 深圳市正弦电气有限公司 | Frequency converter and three-phase output over-current protection circuit thereof |
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| CN103970162A (en) | 2014-08-06 |
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