CN110350779A - Power supply energy storage control system for level meter - Google Patents
Power supply energy storage control system for level meter Download PDFInfo
- Publication number
- CN110350779A CN110350779A CN201910627481.1A CN201910627481A CN110350779A CN 110350779 A CN110350779 A CN 110350779A CN 201910627481 A CN201910627481 A CN 201910627481A CN 110350779 A CN110350779 A CN 110350779A
- Authority
- CN
- China
- Prior art keywords
- power supply
- isolated
- control circuit
- level meter
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention discloses a kind of power supply energy storage control systems for level meter, belong to radar levelmeter field.System includes at least isolated 4-20mA power supply module, storage capacitor, control circuit；Isolated 4-20mA power supply module includes two isolated transformer groups, switching tube, operational amplifier, zener diode arrays, first isolated transformer group connects zener diode array, second isolated transformer group connects operational amplifier, connection switch pipe between the first isolated transformer group and operational amplifier；Isolated 4-20mA power supply module is connect with the booster circuit in control circuit, MCU control circuit；Control circuit further includes reduction voltage circuit and discharge switch；Solve the problems, such as that existing two-wire system 4-20mA system is unable to satisfy the power demands power supply of level meter duty cycle high energy consumption；Reach and met level meter in the power demands of duty cycle high energy consumption, has improved the explosive-proof grade of level meter and the effect of safety.
Description
Technical field
The present embodiments relate to radar levelmeter field, in particular to a kind of power supply energy storage for level meter controls system
System.
Background technique
In industrial processes, radar levelmeter ensure product quality, production security and in terms of send out
Wave important role.Level gauging principle mainly has two kinds of pulsed (TDR) and CW with frequency modulation (FMCW) at present.It is general
The functional block diagram of fmcw radar level meter is as shown in Figure 1, FMCW CW with frequency modulation level meter utilizes the difference on the frequency of CW with frequency modulation
Information carries out level gauging, can reduce the requirement to reflected signal amplitude, improves Measurement reliability and measurement accuracy.
As level meter measurement accuracy and ranging distance are continuously improved, function required for transmission power and reception signal processing
Rate level also correspondinglys increase.Radar levelmeter in measurement storage tank is usually connect with two-wire interface, and only two of them line was both used
In the measuring signal for being used to transmit measurement and processing again to level meter supply limited power.Therefore, the 4-20mA loop the case where
Under, available power depends on the signal value of level meter, causes within the period of signal value low (for example, about 4mA), only very
Limited power is available, even if available power may also be not enough to surveying within the period of high RST value (for example, about 20mA)
It powers during measuring the period to processing circuit and microwave emitter.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides a kind of power supply energy storage controls for level meter
System.The technical solution is as follows:
In a first aspect, providing a kind of power supply energy storage control system for level meter, which includes at least isolated
4-20mA power supply module, storage capacitor, control circuit；
Isolated 4-20mA power supply module includes two isolated transformer groups, switching tube, operational amplifier, two pole of pressure stabilizing
Pipe array, the input terminal of the first isolated transformer group are connected with zener diode array, the second isolated transformer group connection
Operational amplifier is connected with switching tube between the first isolated transformer group and operational amplifier；
Isolated 4-20mA power supply module is connect with the booster circuit in control circuit, MCU control circuit；
Control circuit further includes reduction voltage circuit and discharge switch, and booster circuit is connect by current-limiting resistance with storage capacitor,
Storage capacitor is connect by discharge switch with reduction voltage circuit, and MCU control circuit is connect with discharge switch；
MCU control circuit is used to control the state of discharge switch and generates the corresponding 4-20mA simulation of level measurement data
Signal.
Optionally, isolated 4-20mA power supply module is connect with external power supply, plc data port；
Reduction voltage circuit in control circuit is connect with DSP processing unit, transmitting link, receives link.
Optionally, switching tube is field-effect tube；
The output end of operational amplifier and the grid of field-effect tube connect, the source electrode of field-effect tube and the first isolated transformation
The connection of device group.
Technical solution provided in an embodiment of the present invention has the benefit that
The power supply energy storage control system for being used for level meter is integrated in inside level gauge system, which includes at least isolation
Formula 4-20mA power supply module, storage capacitor, control circuit, isolated 4-20mA power supply module include two isolated transformers
The input terminal of group, switching tube, operational amplifier, zener diode array, the first isolated transformer group is connected with two pole of pressure stabilizing
Pipe array, the second isolated transformer group is connected with operational amplifier, between the first isolated transformer group and operational amplifier
It is connected with switching tube；Isolated 4-20mA power supply module is connect with the booster circuit in control circuit, MCU control circuit；Control
Circuit further includes reduction voltage circuit and discharge switch, and booster circuit is connect by current-limiting resistance with storage capacitor, and storage capacitor passes through
Discharge switch is connect with reduction voltage circuit, and MCU control circuit is connect with discharge switch；Solves existing two-wire system 4-20mA system
The problem of being unable to satisfy the power demands power supply of level meter duty cycle high energy consumption；Reach and has met level meter in duty cycle height
The power demands of energy consumption improve the explosive-proof grade of level meter and the effect of safety.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of schematic illustration of online number calculation method；
Fig. 2 is that a kind of principle of power supply energy storage control system for level meter shown according to an exemplary embodiment is shown
It is intended to；
Fig. 3 is a kind of schematic diagram of isolated 4-20mA power supply module shown according to an exemplary embodiment；
Fig. 4 is the schematic diagram that a kind of storage capacitor shown according to an exemplary embodiment connects to the control circuit.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 shows a kind of principle signal of power supply energy storage control system for level meter provided by the embodiments of the present application
Figure, the power supply energy storage control system for being used for level meter are integrated in inside level meter.
As shown in Figure 1, the power supply energy storage control system for being used for level meter includes at least isolated 4-20mA power supply module
10, storage capacitor C1, control circuit.
Isolated 4-20mA power supply module be used for be completed at the same time supply voltage isolated variable and 4-20mA signal every
Dissociate coupling operational.
As shown in Fig. 2, isolated 4-20mA power supply module includes two isolated transformer groups, i.e., the first isolated transformation
The isolated transformer group S2 of device group S1 and second further includes switching tube Q1, zener diode array D2, operational amplifier A1.
The input terminal of first isolated transformer group S1 is connected with zener diode array D2.In zener diode array D2
Including zener diode quantity determine according to actual needs.
Second isolated transformer group S2 is connected with operational amplifier A1.Specifically, the second isolated transformer group S2 connects
The non-inverting input terminal of operational amplifier A1 is connect, the inverting input terminal of operational amplifier A1 connects resistance R3.
Switching tube Q1 is connected between first isolated transformer group S1 and operational amplifier A1.
Optionally, switching tube Q1 is field-effect tube.Specifically, the grid of the output end of operational amplifier A1 and switching tube Q1
Connection, the source electrode of switching tube Q1 are connect with the first isolated transformer group S1, and the drain electrode of switching tube Q1 connects resistance R3.
Fig. 2 middle port Vin indicates external power input mouth；Port I O table shows 4-20mA signal output port, port VO+
Indicate that voltage converts delivery outlet；Port Si+ indicates that positive negative signal converts delivery outlet；Port 0V/Si- indicates that negative pressure signal conversion is defeated
Export/0 current potential port.
As shown in Figure 1, isolated 4-20mA power supply module is connect with external power supply, external power supply 24VDC, isolated 4-
20mA power supply module is connect with plc data port.
In isolated 4-20mA power supply module, zener diode array and the first isolated transformer group realize that voltage turns
Change function；The reaction type coupling circuit of operational amplifier A1 and switching tube Q1, resistance R3 composition realize signal coupling.
Isolated 4-20mA power supply module is connect with the booster circuit 20 in control circuit, MCU control circuit 30.
Control circuit further includes reduction voltage circuit 40 and discharge switch K1.
Booster circuit is connect by current-limiting resistance R1 with storage capacitor C1, and storage capacitor C1 passes through discharge switch K1 and decompression
Circuit 40 connects, and MCU control circuit 30 is connect with discharge switch K1.
MCU control circuit 30 is used to control the state of discharge switch K1, and generates the corresponding 4- of level measurement data
20mA analog signal.
Reduction voltage circuit 40 in control circuit is connect with DSP processing unit 50, transmitting link 60, receives link 70.
Optionally, storage capacitor is alminium electrolytic condenser.
Optionally, in control circuit, booster circuit is Boost circuit, and reduction voltage circuit is Buck reduction voltage circuit.
Booster circuit 20 receives the power supply by isolation exported by isolated 4-20mA power supply module, and carries out at boosting
Reason.Voltage is conducive to storage capacitor C1 and stores more quantities of electric charge after increasing.Current-limiting resistance R1 is for controlling storage capacitor charging
And size of current when electric discharge.
In the measurement period of level meter, MCU control circuit controls discharge switch K1 conducting, by storage capacitor and isolated 4-
20mA power supply module provides electric energy.
In the non-measured period of level meter, MCU control circuit controls discharge switch K1 and disconnects, and storage capacitor stores charge.
In control circuit, in the measurement period of level meter, MCU control circuit 30 controls discharge switch K1 and opens, decompression
Circuit 40 carries out decompression processing, releases electric current and uses to DSP processing unit 50, Tx transmitting link 60, Rx receives link 70.
When isolated 4-20mA power supply module 10 receives external power supply 24VDC power supply, MCU control circuit 30 is provided
The coupling output of 4-20mA analog signal carries out data monitoring to PLC.In isolated this level-one of 4-20mA power supply module, it is completed at the same time
The inside and outside isolation of power supply and signal wire does not need additionally to carry out the isolation of 4-20mA signal wire or the isolation of power circuit,
The signal and power supply for being supplied to rear class only need to carry out simple signal processing or power supply energy storage.
As shown in Figure 1, the power supply energy storage control system for being used for level meter simplifies system interface, external interface only has two
Line power supply signal interface only has a pair of of signaling interface, a pair of of power interface to inner joint, and domestic and foreign work process is simply clear.
In conclusion the power supply energy storage control system provided by the embodiments of the present application for level meter, is integrated in level meter
Internal system, the system include at least isolated 4-20mA power supply module, storage capacitor, control circuit, isolated 4-20mA electricity
Source component includes two isolated transformer groups, switching tube, operational amplifier, zener diode arrays, the first isolated transformation
The input terminal of device group is connected with zener diode array, and the second isolated transformer group is connected with operational amplifier, the first isolation
Switching tube is connected between formula transformer group and operational amplifier；Boosting in isolated 4-20mA power supply module and control circuit
Circuit, MCU control circuit connection；Control circuit further includes reduction voltage circuit and discharge switch, booster circuit by current-limiting resistance with
Storage capacitor connection, storage capacitor are connect by discharge switch with reduction voltage circuit, and MCU control circuit is connect with discharge switch；Solution
The problem of existing two-wire system 4-20mA system of having determined is unable to satisfy the power demands power supply of level meter duty cycle high energy consumption；It reaches
To level meter is met in the power demands of duty cycle high energy consumption, the explosive-proof grade of level meter and the effect of safety are improved.
It should be understood that the serial number of the above embodiments of the invention is only for description, do not represent the advantages or disadvantages of the embodiments.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of power supply energy storage control system for level meter, which is characterized in that the system includes at least isolated 4-
20mA power supply module, storage capacitor, control circuit；
The isolated 4-20mA power supply module includes two isolated transformer groups, switching tube, operational amplifier, two pole of pressure stabilizing
Pipe array, the input terminal of the first isolated transformer group are connected with zener diode array, the second isolated transformer group connection
Operational amplifier is connected with the switching tube between the first isolated transformer group and the operational amplifier；
The isolated 4-20mA power supply module is connect with the booster circuit in the control circuit, MCU control circuit；
The control circuit further includes reduction voltage circuit and discharge switch, and the booster circuit is connected by current-limiting resistance and storage capacitor
It connects, the storage capacitor is connect by the discharge switch with the reduction voltage circuit, and the MCU control circuit is opened with the electric discharge
Connection connects；
The MCU control circuit is used to control the state of the discharge switch and generates the corresponding 4-20mA of level measurement data
Analog signal.
2. the power supply energy storage control system according to claim 1 for level meter, which is characterized in that the isolated 4-
20mA power supply module is connect with external power supply, plc data port；
Reduction voltage circuit in the control circuit is connect with DSP processing unit, transmitting link, receives link.
3. the power supply energy storage control system according to claim 1 for level meter, which is characterized in that the switching tube is
Field-effect tube；
The output end of the operational amplifier is connect with the grid of the field-effect tube, the source electrode of the field-effect tube and described the
One isolated transformer group connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910627481.1A CN110350779B (en) | 2019-07-12 | 2019-07-12 | Power supply energy storage control system for level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910627481.1A CN110350779B (en) | 2019-07-12 | 2019-07-12 | Power supply energy storage control system for level meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110350779A true CN110350779A (en) | 2019-10-18 |
| CN110350779B CN110350779B (en) | 2020-09-11 |
Family
ID=68175841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910627481.1A Active CN110350779B (en) | 2019-07-12 | 2019-07-12 | Power supply energy storage control system for level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110350779B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404842A (en) * | 2008-10-15 | 2009-04-08 | 江阴旺达电子有限公司 | Three-wire system high-power LED driver |
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN103560778A (en) * | 2013-10-16 | 2014-02-05 | 广州金升阳科技有限公司 | Two-wire system signal isolation transmission circuit |
| CN203734363U (en) * | 2013-12-17 | 2014-07-23 | 重庆川仪自动化股份有限公司 | Two-wire system instrument power supply system and two-wire system instrument |
| CN204681076U (en) * | 2015-04-17 | 2015-09-30 | 天津菲特测控仪器有限公司 | A kind of protective circuit for exchanging two-wire system tuning fork material-position measuring meter |
| CN208739012U (en) * | 2018-06-27 | 2019-04-12 | 天津菲特测控仪器有限公司 | Novel two-wire system instrument power circuit |
| US20190115846A1 (en) * | 2017-06-20 | 2019-04-18 | Infineon Technologies Austria Ag | Digital Synchronous Rectification Control for Flyback Converter |
-
2019
- 2019-07-12 CN CN201910627481.1A patent/CN110350779B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404842A (en) * | 2008-10-15 | 2009-04-08 | 江阴旺达电子有限公司 | Three-wire system high-power LED driver |
| CN101453169A (en) * | 2008-12-02 | 2009-06-10 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN103560778A (en) * | 2013-10-16 | 2014-02-05 | 广州金升阳科技有限公司 | Two-wire system signal isolation transmission circuit |
| CN203734363U (en) * | 2013-12-17 | 2014-07-23 | 重庆川仪自动化股份有限公司 | Two-wire system instrument power supply system and two-wire system instrument |
| CN204681076U (en) * | 2015-04-17 | 2015-09-30 | 天津菲特测控仪器有限公司 | A kind of protective circuit for exchanging two-wire system tuning fork material-position measuring meter |
| US20190115846A1 (en) * | 2017-06-20 | 2019-04-18 | Infineon Technologies Austria Ag | Digital Synchronous Rectification Control for Flyback Converter |
| CN208739012U (en) * | 2018-06-27 | 2019-04-12 | 天津菲特测控仪器有限公司 | Novel two-wire system instrument power circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110350779B (en) | 2020-09-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104704377B (en) | Intelligent power sensor device | |
| CN102210090B (en) | Energy storage unit for a radar level gauge system | |
| US9863980B2 (en) | Loop-powered field device with voltage regulator and current source in series | |
| CN207456562U (en) | Field device, tank gauging system and the terminal block for field device | |
| US20160313717A1 (en) | Field Device for Detecting or Monitoring a Physical or Chemical Process Variable of a Medium | |
| CN206161092U (en) | Oil mass remote monitoring system | |
| CN101334303B (en) | Field equipment of two-wire | |
| CN203629740U (en) | Pressure transmitter | |
| CN110350779A (en) | Power supply energy storage control system for level meter | |
| CN202261241U (en) | Current signal conversion function module | |
| CN205593673U (en) | Compound sensor system based on electric field induction formula | |
| CN202351330U (en) | Anti-interference dielectric loss tester | |
| CN107328488A (en) | Combined type trans system based on electric field induction | |
| CN201269864Y (en) | Intelligent SF6 gas sensor | |
| CN211043986U (en) | Remote flow metering control circuit | |
| US20220271751A1 (en) | Combined logic control circuit and sewage treatment system | |
| CN113710993A (en) | Radar level gauge system and method for controlling a radar level gauge system | |
| CN206281501U (en) | A kind of transmitter | |
| CN208887796U (en) | A kind of high-voltage switch cabinet of transformer substation wireless and passive temp measuring system based on UHF technology | |
| CN113050488A (en) | Water treatment remote monitoring system based on 5G network | |
| CN208140791U (en) | A kind of zero-detection circuit | |
| CN212305301U (en) | PWM isolation control output 4-20mA circuit | |
| CN110581561A (en) | Reactive power compensation device for power equipment | |
| CN217718525U (en) | Double-channel synchronous transmitter | |
| CN217655190U (en) | Support inside and outside power supply's 4-20mA current signal acquisition circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |