CN109520590A - A kind of radar level gauging system and its method of supplying power to - Google Patents
A kind of radar level gauging system and its method of supplying power to Download PDFInfo
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- CN109520590A CN109520590A CN201811550020.0A CN201811550020A CN109520590A CN 109520590 A CN109520590 A CN 109520590A CN 201811550020 A CN201811550020 A CN 201811550020A CN 109520590 A CN109520590 A CN 109520590A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Disclosed herein is a kind of radar level gauging system and method for supplying power to.The system comprises: power supply module and load circuit；Power supply module is used to the electric energy of DC power supply being converted to the voltage of setting by energy storage and decompression and power for load circuit；The radar radiofrequency signal received is converted to radar digital signal and exported to control and signal processing module by radar radio-frequency signal processing module for emitting and receiving radar radiofrequency signal；Switch module is used to connect when being connected the feeder ear of radar radio-frequency signal processing module, and when disconnection disconnects the feeder ear of radar radio-frequency signal processing module；Control and signal processing module, which are used for the conducting of control switch module and disconnection, powers on the radar radio-frequency signal processing module interval, data processing is carried out after receiving radar digital signal and obtains measurement result, and the output electric current that control power supply module changes DC power supply makes it indicate the numerical value of measurement result.Scheme herein is able to satisfy the power consumption requirements of two-wire system radar level gauging system.
Description
Technical field
Present document relates to level gauging technical field more particularly to a kind of radar level gauging systems and its supplier of electricity
Method.
Background technique
Radar levelmeter is a kind of common metrical instrument in level gauging field, and with measuring, accurate, performance is stable, reliable
Property height, easy maintenance, it is applied widely the advantages that.Radar levelmeter is mountable in various metals, nonmetallic vessel or pipeline,
Contactless continuous measurement is carried out to the level of liquid, slurry and particulate material.With radar levelmeter towards intelligence, miniaturization
Development, present radar levelmeter generallys use single-chip radar sensor and measures.
Two-wire system interface is a kind of common interfaces of industrial instrument, by the way that supply lines and signal wire to be combined into one, significantly
Construction and cable cost are saved, is brought great convenience to site operation and later maintenance.
The equipment powered using two-wire system interface, in order to enable a device under minimum transfer electric current electric power thus supplied still just
Often work, to the low-power consumption of equipment, more stringent requirements are proposed.
Summary of the invention
Herein the technical problem to be solved is that a kind of radar level gauging system and its method of supplying power to is provided, can satisfy
The power consumption requirements of two-wire system radar level gauging system.
The embodiment of the present invention provides a kind of radar level gauging system, comprising: includes: power supply module and load circuit；Institute
Stating load circuit includes: switch module, radar radio-frequency signal processing module, control and signal processing module；
The power supply module, for the electric energy of DC power supply to be converted to the voltage of setting by energy storage and decompression and is negative
Carry circuit power supply；
Radar radio-frequency signal processing module believes the radar radio frequency received for emitting and receiving radar radiofrequency signal
Radar digital signal number is converted to export to control and signal processing module；
Switch module connects the feeder ear of radar radio-frequency signal processing module when for being connected, radar is disconnected when disconnection and is penetrated
The feeder ear of audio signalprocessing module；
Control and signal processing module, conducting and disconnection for control switch module handle the radar radiofrequency signal
Module interval powers on；After receiving radar digital signal, data processing is carried out to the radar digital signal and obtains measurement knot
Fruit, control power supply module change the output electric current of DC power supply, and the size of the output electric current indicates the number of the measurement result
Value.
In the exemplary embodiment, control and signal processing module are disconnected for control switch module in the following ways:
After the radar digital signal for receiving the transmission of radar radio-frequency signal processing module, the disconnection of control switch module makes the radar
Radio-frequency signal processing module power-off.
In the exemplary embodiment, control and signal processing module are connected for control switch module in the following ways:
The conducting of timing control switch module powers on the radar radio-frequency signal processing module periodically.
In the exemplary embodiment, the control and signal processing module, comprising: main control chip and Digital Signal Processing
Dsp chip；
The main control chip, the measurement result sent for receiving the dsp chip, control power supply module change direct current
The size of the output electric current in source, the output electric current indicates the numerical value of the measurement result；
The dsp chip powers on the radar radio-frequency signal processing module for the conducting of control switch module；It is receiving
After the radar digital signal for finishing the transmission of radar radio-frequency signal processing module, the disconnection of control switch module believes the radar radio frequency
The power-off of number processing module；Data processing is carried out to the radar digital signal and obtains measurement result, the measurement result is sent
To the main control chip.
In the exemplary embodiment, the dsp chip is also used to the measurement result being sent to the main control chip
Afterwards, into suspend mode or low-power consumption mode.
In the exemplary embodiment, the dsp chip is also used to receive the wake-up signal backed off after random suspend mode of main control chip
Mode or low-power consumption mode；After exiting suspend mode or low-power consumption mode, the conducting of control switch module makes the radar radio frequency
Signal processing module powers on；
The main control chip is also used to timing to the dsp chip and sends wake-up signal.
In the exemplary embodiment, the power supply module includes: current control unit, energy-storage units, electric current vent unit
And pressure unit；Energy-storage units include energy-storage travelling wave tube；
The input terminal of current control unit connects DC power supply, and output end connects energy-storage units, in control and signal
Change the output electric current of DC power supply under the control of processing module；
The input terminal of energy-storage units connects current control unit, and output end connects pressure unit, for passing through energy-storage travelling wave tube
Store the electric energy of DC power supply；
Electric current vent unit connects energy-storage units, lets out for carrying out electric current when the voltage at energy-storage travelling wave tube both ends is more than threshold value
It puts；
The input terminal of pressure unit connects energy-storage units, and output end connects load circuit, for export energy-storage units
Voltage is reduced to multiple power supplies voltage, output to load circuit.
In the exemplary embodiment, the current control unit includes: the first operational amplifier U1, second operational amplifier
U2, resistance R1, R2, R3, R4, R5, switching tube Q1 and Q2；
The radar level gauging system further include: digital analog converter DAC100；The DAC100 and the control and letter
The connection of number processing module is built in the control and signal processing module, for measurement result to be converted to control electric current letter
Number voltage signal；
The inverting input terminal of the first operational amplifier U1 be separately connected resistance R2 first end and switching tube Q1
One end, the second end of resistance R2 connect the anode of the DC power supply, the cathode ground connection of the DC power supply；First operation
Amplifier U1 non-inverting input terminal connection resistance R3 first end, the second end of resistance R3 be separately connected resistance R1 second end and
The first end of switching tube Q2；The first end of resistance R1 connects the anode of the DC power supply；The first operational amplifier U1's
The second end of output end connection switch pipe Q1；
The output end of the non-inverting input terminal connection DAC100 of the second operational amplifier U2；The second operational amplifier
The first end of the inverting input terminal connection resistance R4 of U2, the second end of resistance R4 are separately connected third end and the resistance of switching tube Q1
The first end of R5；The second end of resistance R5 is grounded；The second of the output end connection switch pipe Q2 of the second operational amplifier U2
End；Output end of the third end of the switching tube Q2 as the current control unit 101.
In the exemplary embodiment, the electric current vent unit includes: operational amplifier U3, triode J1, resistance R6,
R7, R8, R9 and voltage-stabiliser tube Z1；
The first end of the reverse side connection resistance R6 of the operational amplifier U3 and the first end of resistance R7, the resistance R6
Second end connection capacitor C1 first end, the capacitor C1 second end ground connection, the resistance R7 second end ground connection；It is described
Capacitor C1 is energy-storage travelling wave tube；
The in-phase end of the operational amplifier U3 connects reference voltage Vref；
The base stage of the output end connection transistor J1 of the operational amplifier U3, the collector of the transistor J1 connect electricity
Hinder the first end of R9, the first end of the second end connection capacitor C1 of the resistance R9；The emitter of the transistor J1 is grounded.
In the exemplary embodiment, the radar radio-frequency signal processing module is radar sensor chip.
The embodiment of the present invention provides a kind of method of supplying power to of radar level gauging system, comprising:
Control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module；
After radar radio-frequency signal processing module powers on, emit and receive radar radiofrequency signal, the radar radio frequency that will be received
Signal is converted to radar digital signal and exports to control and signal processing module；
After control and signal processing module receive radar digital signal, the disconnection of control switch module makes radar radiofrequency signal
Processing module power-off carries out data processing to the radar digital signal and obtains measurement result, and control power supply module changes direct current
The size of the output electric current of power supply, the output electric current indicates the numerical value of the measurement result.
In the exemplary embodiment, the control and the conducting of signal processing module control switch module make radar radiofrequency signal
Processing module powers on, comprising:
Control and the conducting of signal processing module timing control switch module power on radar radio-frequency signal processing module.
In the exemplary embodiment, the control and signal processing module include: main control chip and Digital Signal Processing DSP
Chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, wrap
Include: the conducting of dsp chip control switch module powers on radar radio-frequency signal processing module；
After the control and signal processing module receive radar digital signal, the disconnection of control switch module makes radar radio frequency
Signal processing module power-off, comprising: after dsp chip receives radar digital signal, the disconnection of control switch module makes radar radio frequency
Signal processing module power-off；
The control and signal processing module handle the radar digital signal to obtain measurement result, control power supply
The output electric current of module change DC power supply, comprising: dsp chip carries out data processing to the radar digital signal and measured
As a result, the measurement result is sent to main control chip；After main control chip receives measurement result, control power supply module changes straight
The output electric current in galvanic electricity source.
In the exemplary embodiment, the method also includes:
After measurement result is sent to main control chip by dsp chip, into suspend mode or low-power consumption mode；
Dsp chip is in the wake-up signal backed off after random suspend mode or low-power consumption mode for receiving main control chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, wrap
It includes:
For dsp chip after exiting suspend mode or low-power consumption mode, the conducting of control switch module believes the radar radio frequency
Number processing module powers on.
Compared with the relevant technologies, radar level gauging system and its method of supplying power to provided in an embodiment of the present invention, by
The power consumption of radar radio-frequency signal processing module can be reduced for the power supply of radar radio-frequency signal processing module by having a rest, to meet two lines
The power consumption requirements of radar level gauging system processed.In some embodiments, control and signal processing module control radar radio frequency
Signal processing module periodically powers on, and control and signal processing module are in the thunder for receiving the output of radar radio-frequency signal processing module
Up to after digital signal, the power-off of first time control radar radio-frequency signal processing module shortens radar radiofrequency signal to greatest extent
The power-on time of processing module further reduced the power consumption of entire radar level gauging system.By control and signal processing mould
Block undertakes radar digital signal processing function, can be by making the dsp chip for being responsible for radar data processing not handle radar number
Enter suspend mode or low power consumpting state when word signal, to further decrease the power consumption of entire system for level gauging.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of radar level gauging system in the embodiment of the present invention；
Fig. 2-a is control a kind of in the embodiment of the present invention and the schematic diagram of signal processing module；
Fig. 2-b is the schematic diagram of another control and signal processing module in the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of power supply module in the embodiment of the present invention；
Fig. 4-a is a kind of schematic diagram of current control unit in the embodiment of the present invention；
Fig. 4-b is a kind of schematic diagram of electric current vent unit in the embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of radar level gauging system (with display operation module) in the embodiment of the present invention；
Fig. 6 is a kind of method of supplying power to flow chart of radar level gauging system in the embodiment of the present invention；
Fig. 7 is the radar level gauging system schematic diagram of example 1 of the present invention；
Fig. 8 is the schematic diagram of single-chip radar sensor in example 1 of the present invention.
Appended drawing reference
1 power supply module；2 load circuits；20 switch modules；30 radar radio-frequency signal processing modules；At 40 controls and signal
Manage module；50 displays and operation module；
101 current control units；102 energy-storage units；103 electric current vent units；104 pressure units；
401 main control chips；402DSP chip；
100 digital analog converter DAC.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
" first ", " second " used in present specification and claims and similar word are not offered as
Any sequence, quantity or importance, and be used only to distinguish different component parts." connection " or " connected " etc. are similar
Word is not limited to physics or mechanical connection, but may include electrical connection, it is either direct or between
It connects.
As shown in Figure 1, at least one embodiment of the invention provides a kind of radar level gauging system, comprising: power supply mould
Block 1 and load circuit 2；The load circuit 2 includes: switch module 20, radar radio-frequency signal processing module 30, control and signal
Processing module 40；
The power supply module, for the electric energy of DC power supply to be converted to the voltage of setting by energy storage and decompression and is negative
Carry circuit power supply；
Radar radio-frequency signal processing module believes the radar radio frequency received for emitting and receiving radar radiofrequency signal
Radar digital signal number is converted to export to control and signal processing module；
Switch module connects the feeder ear of radar radio-frequency signal processing module when for being connected, radar is disconnected when disconnection and is penetrated
The feeder ear of audio signalprocessing module；
Control and signal processing module, conducting and disconnection for control switch module handle the radar radiofrequency signal
Module interval powers on；After receiving radar digital signal, data processing is carried out to the radar digital signal and obtains measurement knot
Fruit, control power supply module change the output electric current of DC power supply, and the size of the output electric current indicates the number of the measurement result
Value.
In the above-described embodiment, radar radio-frequency signal processing module interval, which powers on, can reduce the processing of radar radiofrequency signal
The power consumption of module, so that entire radar level gauging system still is able to meet power consumption under minimum transfer electric current electric power thus supplied
It is required that.
In one embodiment, control and signal processing module are disconnected for control switch module in the following ways:
After the radar digital signal for receiving the transmission of radar radio-frequency signal processing module, the disconnection of control switch module makes the radar
Radio-frequency signal processing module power-off.
In the above-described embodiment, control and signal processing module are receiving the output of radar radio-frequency signal processing module
After radar digital signal, the power-off of first time control radar radio-frequency signal processing module shortens radar radio frequency letter to greatest extent
The power-on time of number processing module, further reduced the power consumption of entire radar level gauging system.
In one embodiment, control and signal processing module are connected for control switch module in the following ways:
The conducting of timing control switch module powers on the radar radio-frequency signal processing module periodically.
In the above-described embodiment, make radar radio-frequency signal processing module periodically power on relative to always be radar radio frequency
Signal processing module powers on, and can more save the power consumption of radar level gauging system.
In one embodiment, the data processing packet that control and signal processing module carry out the radar digital signal
It includes: FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) operation；
In one embodiment, the radar radio-frequency signal processing module is realized using radar sensor chip.
In the related technology, radar radiofrequency signal processing subsystem and digital radar are generally integrated on radar sensor chip
Signal processing subsystem, therefore, the power consumption of radar sensor chip are larger.At radar radiofrequency signal on radar sensor chip
Reason subsystem first works, and generates radar digital signal, then the radar digital signal processing subsystem on radar sensor chip
It starts to work again, radar digital signal processing (for example, FFT operation, take logarithm operation) is carried out, due to digital signal operation time
It is longer, therefore entire chip is in long-time power consumption state.
And the technical solution of the application, if radar radiofrequency signal processing subsystem is integrated on radar sensor chip simultaneously
System and radar digital signal processing subsystem (radar hardware accelerator), are also penetrated just with the radar on radar sensor chip
Audio signalprocessing subsystem, and do not use the radar hardware accelerator of chip interior.Once radar radiofrequency signal processing subsystem
Radar radiofrequency signal and processing are received from antenna to be just output to the radar digital signal described after radar digital signal
Except radar sensor chip, then radar sensor chip is set to break by control and the disconnection of signal processing module control switch module
Electricity saves the power consumption of entire system for level gauging so that radar sensor chip be made to be in short-term operation state.
In one embodiment, as shown in Fig. 2-a, the control and signal processing module 40, comprising: main control chip
401 and Digital Signal Processing dsp chip 402；
The main control chip, the measurement result sent for receiving the dsp chip, control power supply module change direct current
The size of the output electric current in source, the output electric current indicates the numerical value of the measurement result；
The dsp chip powers on the radar radio-frequency signal processing module for the conducting of control switch module；It is receiving
After the radar digital signal for finishing the transmission of radar radio-frequency signal processing module, the disconnection of control switch module believes the radar radio frequency
The power-off of number processing module；Data processing is carried out to the radar digital signal and obtains measurement result, the measurement result is sent
To the main control chip.
In one embodiment, as shown in Fig. 2-b, the control and signal processing module 40, comprising: main control chip
401 and Digital Signal Processing dsp chip 402；
The main control chip powers on the radar radio-frequency signal processing module for the conducting of control switch module, to DSP
Chip sends the first notification message；After receiving second notification message, the disconnection of control switch module makes the radar radiofrequency signal
Processing module power-off, after receiving measurement result, control power supply module changes the output electric current of DC power supply, the output electric current
Size indicate the numerical value of the measurement result；
The dsp chip is receiving radar radio frequency for doing signal reception preparation after receiving the first notification message
After the radar digital signal that signal processing module is sent, Xiang Suoshu main control chip sends second notification message, to the radar number
Word signal carries out data processing and obtains measurement result, and the measurement result is sent to the main control chip；
In above embodiment, control function and digital signal processing function are born respectively by two pieces of independent chips
Duty, generally, dsp chip is good at calculation process, and calculated performance can be not concerned with by controlling chip, and control and calculating are provided separately
Can optimization system design, be conducive to chip type selecting.
In one embodiment, the dsp chip is also used to the measurement result being sent to the main control chip
Afterwards, into suspend mode or low-power consumption mode.
In the above-described embodiment, dsp chip enters suspend mode or low-power consumption mode after having handled radar data, can
Further save the power consumption of radar level gauging system.
In one embodiment, the dsp chip is also used to receive the wake-up signal backed off after random suspend mode of main control chip
Mode or low-power consumption mode；After exiting suspend mode or low-power consumption mode, the conducting of control switch module makes the radar radio frequency
Signal processing module powers on；
The main control chip is also used to timing to the dsp chip and sends wake-up signal；
In the above-described embodiment, it is all generally integrated with timer on main control chip, it therefore, can be by main control chip timing
Wake up dsp chip.
In one embodiment, as shown in figure 3, the power supply module includes: current control unit 101, energy-storage units
102, electric current vent unit 103 and pressure unit 104；Energy-storage units include energy-storage travelling wave tube；
The input terminal of current control unit connects DC power supply, and output end connects energy-storage units, in control and signal
Change the output electric current of DC power supply under the control of processing module；
The input terminal of energy-storage units connects current control unit, and output end connects pressure unit, for passing through energy-storage travelling wave tube
Store the electric energy of DC power supply；
Electric current vent unit connects energy-storage units, lets out for carrying out electric current when the voltage at energy-storage travelling wave tube both ends is more than threshold value
It puts；
The input terminal of pressure unit connects energy-storage units, and output end connects load circuit, for export energy-storage units
Voltage is reduced to multiple power supplies voltage, output to load circuit.
In one embodiment, the energy-storage travelling wave tube includes: capacitor；
In one embodiment, as depicted in fig. 4-a, the current control unit 101 includes: the first operational amplifier
U1, second operational amplifier U2, resistance R1, R2, R3, R4, R5, switching tube Q1 and Q2；
The radar level gauging system further include: digital analog converter DAC100；The DAC100 and the control and letter
The connection of number processing module is built in the control and signal processing module, for measurement result to be converted to control electric current letter
Number voltage signal；
The inverting input terminal of the first operational amplifier U1 be separately connected resistance R2 first end and switching tube Q1
One end, the second end of resistance R2 connect the anode of the DC power supply, the cathode ground connection of the DC power supply；First operation
Amplifier U1 non-inverting input terminal connection resistance R3 first end, the second end of resistance R3 be separately connected resistance R1 second end and
The first end of switching tube Q2；The first end of resistance R1 connects the anode of the DC power supply；The first operational amplifier U1's
The second end of output end connection switch pipe Q1；
The output end of the non-inverting input terminal connection DAC100 of the second operational amplifier U2；The second operational amplifier
The first end of the inverting input terminal connection resistance R4 of U2, the second end of resistance R4 are separately connected third end and the resistance of switching tube Q1
The first end of R5；The second end of resistance R5 is grounded；The second of the output end connection switch pipe Q2 of the second operational amplifier U2
End；Output end of the third end of the switching tube Q2 as the current control unit 101.
In above-mentioned current control unit 101, resistance R1 is sampling resistor, for sampling the output electric current of DC power supply.
Assuming that the electric current for flowing through sampling resistor R1 is I.According to the electric characteristic of operational amplifier, the electric current for flowing through R3 is zero, because of fortune
The non-inverting input terminal for calculating amplifier is identical as inverting input terminal voltage, and therefore, resistance R2 is identical with the pressure drop on sampling resistor R1,
UR1=UR2。
The second end (grid) of switching tube Q1 is control terminal, when switching tube Q1 is connected, flows through the electric current of R2 from switching tube Q1
First end flow to the second end of switching tube Q1, and flow through resistance R5.According to the electric characteristic of operational amplifier, the electricity of R4 is flowed through
Stream is zero, IR2=IR5。
Change the output voltage V of DAC1000It will lead to second operational amplifier U2 regulating switch pipe Q2, by changing electric current
I makes the voltage of the inverting input terminal of second operational amplifier U2 always be equal to the voltage of non-inverting input terminal, i.e. V0=I*R1/
R2*R5。
Namely: I=V0/ R5*R2/R1=V0*[R2/(R1*R5)]；
Assuming that a=[R2/ (R1*R5)], then I=a*V0；
Therefore, the electric current I for flowing through sampling resistor R1 can be by the output voltage V of DAC1000To adjust.When selection resistance
When the resistance value of R2 is far longer than the resistance value of sampling resistor R1, the output electric current of DC power supply largely all flows through sampling resistor R1,
The electric current shunted by resistance R2 is seldom, can be ignored.It therefore, can be with approximation sample DC power supply by sampling resistor R1
Output electric current.
Therefore, current control unit 101 can be made by the output electric current of the output voltage control DC power supply of DAC100
The size for obtaining the current value transmitted on two-wire system signal transmssion line is corresponding with measurement result.
In one embodiment, as shown in Fig. 4-b, the electric current vent unit includes: operational amplifier U3, triode
J1, resistance R6, R7, R8, R9 and voltage-stabiliser tube Z1；
The first end of the reverse side connection resistance R6 of the operational amplifier U3 and the first end of resistance R7, the resistance R6
Second end connection capacitor C1 first end, the capacitor C1 second end ground connection, the resistance R7 second end ground connection；It is described
Capacitor C1 is energy-storage travelling wave tube；
The in-phase end of the operational amplifier U3 connects reference voltage Vref；
The base stage of the output end connection transistor J1 of the operational amplifier U3, the collector of the transistor J1 connect electricity
Hinder the first end of R9, the first end of the second end connection capacitor C1 of the resistance R9；The emitter of the transistor J1 is grounded.
In the circuit of above-mentioned electric current vent unit, when the voltage at the both ends capacitor C1 is more than U0When, operational amplifier U3's is defeated
Outlet output voltage U1, as voltage U1More than transistor turn-on threshold when, transistor turns, the electric energy on C1 passes through transistor
J1 releases, until the voltage on C1 is reduced to less than or equal to U2When, transistor J1 cut-off, electric current is released stopping.Voltage U0
And U2Value and reference voltage VrefIt is related, by adjusting reference voltage VrefValue, adjustable storage capacitor C1's releases
Threshold value.
When voltage of the voltage-stabiliser tube Z1 at the both ends capacitor C1 is more than the pressure stabilizing value of voltage-stabiliser tube, electric current is carried out by voltage-stabiliser tube and is let out
It puts.
In one embodiment, as shown in figure 5, the radar level gauging system further include: display and operation module
50；
The display and operation module 50 are separately connected power supply module 10 and control and signal processing module 40, for man-machine
Interaction.
As shown in fig. 6, at least one embodiment of the invention provides a kind of method of supplying power to of radar level gauging system, wrap
It includes:
Step S110: control and the conducting of signal processing module control switch module make on radar radio-frequency signal processing module
Electricity；
Step S120: after radar radio-frequency signal processing module powers on, emit and receive radar radiofrequency signal, by what is received
Radar radiofrequency signal is converted to radar digital signal and exports to control and signal processing module；
Step S130: control and after signal processing module receives radar digital signal, the disconnection of control switch module makes thunder
It is powered off up to radio-frequency signal processing module, data processing is carried out to the radar digital signal and obtains measurement result, control power supply mould
Block changes the output electric current of DC power supply, and the size of the output electric current indicates the numerical value of the measurement result.
In above embodiment, radar radio-frequency signal processing module interval, which powers on, can reduce radar radiofrequency signal processing mould
The power consumption of block, so that entire radar level gauging system still is able to meet power consumption and wants under minimum transfer electric current electric power thus supplied
It asks.Control and signal processing module are after the radar digital signal for receiving the output of radar radio-frequency signal processing module, when first
Between control radar radio-frequency signal processing module power off, shorten the power-on time of radar radio-frequency signal processing module to greatest extent,
It further reduced the power consumption of entire radar level gauging system.
In one embodiment, control and the conducting of signal processing module control switch module handle radar radiofrequency signal
Module powers on, comprising: control and the conducting of signal processing module timing control switch module make the radar radiofrequency signal processing mould
Block period powers on.
In the above-described embodiment, make radar radio-frequency signal processing module periodically power on relative to always be radar radio frequency
Signal processing module powers on, and can more save the power consumption of radar level gauging system.
In one embodiment, the control and signal processing module include: main control chip and Digital Signal Processing DSP
Chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, wrap
Include: the conducting of dsp chip control switch module powers on radar radio-frequency signal processing module；
After the control and signal processing module receive radar digital signal, the disconnection of control switch module makes radar radio frequency
Signal processing module power-off, comprising: after dsp chip receives radar digital signal, the disconnection of control switch module makes radar radio frequency
Signal processing module power-off；
The control and signal processing module handle the radar digital signal to obtain measurement result, control power supply
The output electric current of module change DC power supply, comprising: dsp chip carries out data processing to the radar digital signal and measured
As a result, the measurement result is sent to main control chip；After main control chip receives measurement result, control power supply module changes straight
The output electric current in galvanic electricity source.
In one embodiment, the method also includes:
After measurement result is sent to main control chip by dsp chip, into suspend mode or low-power consumption mode；
In one embodiment, the method also includes:
Dsp chip is in the wake-up signal backed off after random suspend mode or low-power consumption mode for receiving main control chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, wrap
It includes:
For dsp chip after exiting suspend mode or low-power consumption mode, the conducting of control switch module believes the radar radio frequency
Number processing module powers on；
In one embodiment, the method also includes:
The main control chip timing sends wake-up signal to the dsp chip.
The radar level gauging system and its method of supplying power to of the application are further illustrated below by example.
Example 1
This example provides a kind of radar level gauging system.The radar level gauging system is designed using two-wire system,
Power supply line and signal wire are multiplexed, and the range of signal code value is 4mA~20mA.
As shown in fig. 7, this exemplary radar level gauging system includes: power supply module 1 and load circuit 2；Wherein, it loads
Circuit 2 includes: switch module 20, radar radio-frequency signal processing module 30, control and signal processing module 40.
The power supply module includes: current control unit 101, and energy-storage units 102, electric current vent unit 103 and decompression are single
Member 104, energy-storage units include energy-storage travelling wave tube.The input terminal of current control unit connects DC power supply, and output end connects energy storage list
Member, for changing the output electric current of DC power supply under the control of control and signal processing module；The input terminal of energy-storage units connects
Current control unit is connect, output end connects pressure unit, for storing the electric energy of DC power supply by energy-storage travelling wave tube；Electric current is released
Unit connects energy-storage units, releases for carrying out electric current when the voltage at energy-storage travelling wave tube both ends is more than threshold value；Pressure unit it is defeated
Enter end connection energy-storage units, output end connects load circuit, and the voltage for exporting energy-storage units is reduced to multiple power supplies electricity
Pressure, output to load circuit.
The control and signal processing module include: main control chip 401 and Digital Signal Processing dsp chip 402.The master
Chip is controlled, the measurement result sent for receiving the dsp chip, control power supply module changes the output electric current of DC power supply,
The size of the output electric current indicates the numerical value of the measurement result.The dsp chip makes institute for the conducting of control switch module
Radar radio-frequency signal processing module is stated to power on；In the radar digital signal for receiving the transmission of radar radio-frequency signal processing module
Afterwards, control switch module disconnection powers off the radar radio-frequency signal processing module；Data are carried out to the radar digital signal
Processing obtains measurement result, and the measurement result is sent to the main control chip；
The radar radio-frequency signal processing module penetrates the radar received for emitting and receiving radar radiofrequency signal
Frequency signal is converted to radar digital signal and exports to dsp chip.
As shown in figure 8, radar radio-frequency signal processing module can be realized using single radar sensor chip.It is general general
Radar sensor chip, radar digital signal processing function would generally be integrated on chip, FFT fortune is carried out to radar digital signal
The data processings such as calculation.Radar hardware accelerator in Fig. 8 is for carrying out radar digital signal processing.In order to save radar sensor
The power consumption of chip, this example do not use the radar hardware accelerator of built-in chip type.
Main control chip timing arrives, and sends wake-up signal to dsp chip, after dsp chip receives the wake-up signal,
Suspend mode is exited, then control switch module is connected, and radar sensor chip powers on, radar primary processor control radar radio frequency
Signal processor work, radar radiofrequency signal processor drive ramp generator work, and ramp generator controls voltage controlled oscillator
(VCO) radiofrequency signal (such as 20GHz) is generated, the radiofrequency signal (such as 20GHz) passes through frequency multiplier (such as 4 frequencys multiplication) frequency multiplication
For high-frequency signal (such as 80GHz), amplifies the high-frequency signal (such as 80GHz) by power amplifier, then pass through antenna
Emit the high-frequency signal (such as 80GHz).The echo-signal of the transmitting signal is received by the antenna, and is received signal and is passed through low noise
Amplifier, frequency mixer obtain intermediate-freuqncy signal, and the intermediate-freuqncy signal is converted into radar digital signal by analog-digital converter (ADC),
The radar digital signal is sent to radar primary processor by radar radiofrequency signal processor.Radar primary processor receives thunder
Up to after digital signal, the radar hardware accelerator of built-in chip type is never called, but the radar digital signal is sent to DSP core
Piece.After dsp chip receives the radar digital signal, control switch module is disconnected, radar sensor powering down chips.In thunder
Up to during sensor chip power-off, dsp chip handles (for example, Fast Fourier Transform (FFT) FFT is transported radar digital signal
Calculate, take logarithm operation), measurement result, which is obtained, after processing is sent to main control chip.Dsp chip is sent to by the measurement result
After the main control chip, into suspend mode, to reduce power consumption.
After main control chip receives the measurement result of dsp chip transmission, the measurement result is scaled control voltage V0,
Main control chip built-in D/A converter DAC100 passes through the output voltage V of DAC1000The output electric current for controlling DC power supply, makes
The size for obtaining the current value transmitted on two-wire system signal transmssion line is corresponding with measurement result.
As depicted in fig. 4-a, the current control unit includes: the first operational amplifier U1, second operational amplifier U2, electricity
Hinder R1, R2, R3, R4, R5, switching tube Q1 and Q2；The inverting input terminal of the first operational amplifier U1 is separately connected resistance R2
First end and switching tube Q1 first end, the second end of resistance R2 connects the anode of the DC power supply, the DC power supply
Cathode ground connection；The first end of the non-inverting input terminal connection resistance R3 of the first operational amplifier U1, the second end of resistance R3
It is separately connected the second end of resistance R1 and the first end of switching tube Q2；The first end of resistance R1 is connecting the DC power supply just
Pole；The second end of the output end connection switch pipe Q1 of the first operational amplifier U1；The second operational amplifier U2's is same
The output end of phase input terminal connection DAC100；The first of the inverting input terminal connection resistance R4 of the second operational amplifier U2
End, the second end of resistance R4 are separately connected the third end of switching tube Q1 and the first end of resistance R5；The second end of resistance R5 is grounded；
The second end of the output end connection switch pipe Q2 of the second operational amplifier U2；Described in the third end of the switching tube Q2 is used as
The output end of current control unit 101.
As shown in Fig. 4-b, the electric current vent unit includes: operational amplifier U3, triode J1, resistance R6, R7, R8,
R9 and voltage-stabiliser tube Z1；The first end of the reverse side connection resistance R6 of the operational amplifier U3 and the first end of resistance R7, it is described
The first end of the second end connection capacitor C1 of resistance R6, the second end ground connection of the capacitor C1, the second termination of the resistance R7
Ground；The capacitor C1 is energy-storage travelling wave tube；The in-phase end of the operational amplifier U3 connects reference voltage Vref；The operation amplifier
The base stage of the output end connection transistor J1 of device U3, the first end of the collector connection resistance R9 of the transistor J1, the electricity
Hinder the first end of the second end connection capacitor C1 of R9；The emitter of the transistor J1 is grounded.
Radar level gauging system in above-mentioned example is that radar sensor chip powers on by interval, can save thunder
Up to the power consumption of sensor chip, so that the power consumption of two-wire system radar level gauging system meets the safe, anti-of industry spot
Quick-fried requirement.Dsp chip control radar sensor chip periodically powers on, and dsp chip is receiving the output of radar sensor chip
Radar digital signal after, first time control radar sensor chip power-off, shorten radar sensor chip to greatest extent
Power-on time, further reduced the power consumption of entire radar level gauging system.Radar digital signal is undertaken by dsp chip
Function is managed, it can be by making dsp chip enter dormant state when not handling radar digital signal, to further decrease entire
The power consumption of system for level gauging.
It should be noted that the invention may also have other embodiments, without departing substantially from spirit of that invention and its essence
In the case of, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these are corresponding
Change and modification all should fall within the scope of protection of the appended claims of the present invention.
Claims (14)
1. a kind of radar level gauging system, comprising: power supply module and load circuit；The load circuit includes: switch module,
Radar radio-frequency signal processing module, control and signal processing module；
The power supply module, for the electric energy of DC power supply to be converted to the voltage of setting by energy storage and decompression and to load electricity
Road power supply；
Radar radio-frequency signal processing module turns the radar radiofrequency signal received for emitting and receiving radar radiofrequency signal
Radar digital signal is changed to export to control and signal processing module；
Switch module connects the feeder ear of radar radio-frequency signal processing module when for being connected, radar radio frequency letter is disconnected when disconnection
The feeder ear of number processing module；
Control and signal processing module, conducting and disconnection for control switch module make the radar radio-frequency signal processing module
Interval powers on；After receiving radar digital signal, data processing is carried out to the radar digital signal and obtains measurement result, is controlled
Power supply module processed changes the output electric current of DC power supply, and the size of the output electric current indicates the numerical value of the measurement result.
2. radar level gauging system as described in claim 1, it is characterised in that:
Control and signal processing module are disconnected for control switch module in the following ways: receiving radar radio frequency letter
After the radar digital signal that number processing module is sent, the disconnection of control switch module keeps the radar radio-frequency signal processing module disconnected
Electricity.
3. radar level gauging system as claimed in claim 2, it is characterised in that:
Control and signal processing module are connected for control switch module in the following ways: the conducting of timing control switch module
Power on the radar radio-frequency signal processing module periodically.
4. radar level gauging system as claimed in any one of claims 1-3, it is characterised in that:
The control and signal processing module, comprising: main control chip and Digital Signal Processing dsp chip；
The main control chip, the measurement result sent for receiving the dsp chip, control power supply module change DC power supply
Electric current is exported, the size of the output electric current indicates the numerical value of the measurement result；
The dsp chip powers on the radar radio-frequency signal processing module for the conducting of control switch module；It is receiving
After the radar digital signal that radar radio-frequency signal processing module is sent, the disconnection of control switch module makes at the radar radiofrequency signal
Manage module power-off；Data processing is carried out to the radar digital signal and obtains measurement result, the measurement result is sent to institute
State main control chip.
5. radar level gauging system as claimed in claim 4, it is characterised in that:
The dsp chip is also used to after the measurement result is sent to the main control chip, into suspend mode or low function
Consumption mode.
6. radar level gauging system as claimed in claim 5, it is characterised in that:
The dsp chip is also used to receive the wake-up signal backed off after random suspend mode or low-power consumption mode of main control chip；It is moving back
Out after suspend mode or low-power consumption mode, the conducting of control switch module powers on the radar radio-frequency signal processing module；
The main control chip is also used to timing to the dsp chip and sends wake-up signal.
7. radar level gauging system as described in claim 1, it is characterised in that:
The power supply module includes: current control unit, energy-storage units, electric current vent unit and pressure unit；Energy-storage units packet
Include energy-storage travelling wave tube；
The input terminal of current control unit connects DC power supply, and output end connects energy-storage units, in control and signal processing
Change the output electric current of DC power supply under the control of module；
The input terminal of energy-storage units connects current control unit, and output end connects pressure unit, for being stored by energy-storage travelling wave tube
The electric energy of DC power supply；
Electric current vent unit connects energy-storage units, releases for carrying out electric current when the voltage at energy-storage travelling wave tube both ends is more than threshold value；
The input terminal of pressure unit connects energy-storage units, and output end connects load circuit, the voltage for exporting energy-storage units
It is reduced to multiple power supplies voltage, output to load circuit.
8. radar level gauging system as claimed in claim 7, it is characterised in that:
The current control unit includes: the first operational amplifier U1, second operational amplifier U2, resistance R1, R2, R3, R4,
R5, switching tube Q1 and Q2；
The radar level gauging system further include: digital analog converter DAC100；The DAC100 and it is described control and signal at
The connection of reason module is built in the control and signal processing module, for measurement result to be converted to control current signal
Voltage signal；
The inverting input terminal of the first operational amplifier U1 is separately connected the first end of resistance R2 and the first end of switching tube Q1,
The second end of resistance R2 connects the anode of the DC power supply, the cathode ground connection of the DC power supply；First operation amplifier
The first end of the non-inverting input terminal connection resistance R3 of device U1, the second end of resistance R3 are separately connected the second end and switch of resistance R1
The first end of pipe Q2；The first end of resistance R1 connects the anode of the DC power supply；The output of the first operational amplifier U1
Hold the second end of connection switch pipe Q1；
The output end of the non-inverting input terminal connection DAC100 of the second operational amplifier U2；The second operational amplifier U2's
Inverting input terminal connects the first end of resistance R4, and the second end of resistance R4 is separately connected third end and the resistance R5 of switching tube Q1
First end；The second end of resistance R5 is grounded；The second end of the output end connection switch pipe Q2 of the second operational amplifier U2；Institute
State output end of the third end of switching tube Q2 as the current control unit 101.
9. radar level gauging system as claimed in claim 7, it is characterised in that:
The electric current vent unit includes: operational amplifier U3, triode J1, resistance R6, R7, R8, R9 and voltage-stabiliser tube Z1；
The first end of the reverse side connection resistance R6 of the operational amplifier U3 and the first end of resistance R7, the of the resistance R6
Two ends connect the first end of capacitor C1, the second end ground connection of the capacitor C1, the second end ground connection of the resistance R7；The capacitor
C1 is energy-storage travelling wave tube；
The in-phase end of the operational amplifier U3 connects reference voltage Vref；
The base stage of the output end connection transistor J1 of the operational amplifier U3, the collector of the transistor J1 connect resistance R9
First end, the resistance R9 second end connection capacitor C1 first end；The emitter of the transistor J1 is grounded.
10. radar level gauging system as described in claim 1, it is characterised in that:
The radar radio-frequency signal processing module is radar sensor chip.
11. a kind of method of supplying power to of radar level gauging system of any of claims 1-10, comprising:
Control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module；
After radar radio-frequency signal processing module powers on, emit and receive radar radiofrequency signal, the radar radiofrequency signal that will be received
It is converted to radar digital signal and exports to control and signal processing module；
After control and signal processing module receive radar digital signal, the disconnection of control switch module handles radar radiofrequency signal
Module power-off carries out data processing to the radar digital signal and obtains measurement result, and control power supply module changes DC power supply
Output electric current, the size of the output electric current indicates the numerical value of the measurement result.
12. method of supplying power to as claimed in claim 11, it is characterised in that:
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, comprising:
Control and the conducting of signal processing module timing control switch module power on radar radio-frequency signal processing module.
13. method of supplying power to as claimed in claim 11, it is characterised in that:
The control and signal processing module include: main control chip and Digital Signal Processing dsp chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, comprising: DSP
The conducting of chip controls switch module powers on radar radio-frequency signal processing module；
After the control and signal processing module receive radar digital signal, the disconnection of control switch module makes radar radiofrequency signal
Processing module power-off, comprising: after dsp chip receives radar digital signal, the disconnection of control switch module makes radar radiofrequency signal
Processing module power-off；
The control and signal processing module handle the radar digital signal to obtain measurement result, control power supply module
Change the output electric current of DC power supply, comprising: dsp chip carries out data processing to the radar digital signal and obtains measurement knot
The measurement result is sent to main control chip by fruit；After main control chip receives measurement result, control power supply module changes direct current
The output electric current of power supply.
14. method of supplying power to as claimed in claim 13, which is characterized in that the method also includes:
After measurement result is sent to main control chip by dsp chip, into suspend mode or low-power consumption mode；
Dsp chip is in the wake-up signal backed off after random suspend mode or low-power consumption mode for receiving main control chip；
The control and the conducting of signal processing module control switch module power on radar radio-frequency signal processing module, comprising:
After exiting suspend mode or low-power consumption mode, the conducting of control switch module makes at the radar radiofrequency signal dsp chip
Reason module powers on.
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| CN201811550020.0A CN109520590B (en) | 2018-12-18 | 2018-12-18 | Radar level measurement system and power supply method thereof |
| PCT/CN2019/087277 WO2020124947A1 (en) | 2018-12-18 | 2019-05-16 | Radar level gauge system, and power supply method for same |
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| CN201811550020.0A CN109520590B (en) | 2018-12-18 | 2018-12-18 | Radar level measurement system and power supply method thereof |
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| WO2020124947A1 (en) * | 2018-12-18 | 2020-06-25 | 北京古大仪表有限公司 | Radar level gauge system, and power supply method for same |
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| WO2020124947A1 (en) | 2020-06-25 |
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