CN110350779B - Power supply energy storage control system for level meter - Google Patents
Power supply energy storage control system for level meter Download PDFInfo
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- CN110350779B CN110350779B CN201910627481.1A CN201910627481A CN110350779B CN 110350779 B CN110350779 B CN 110350779B CN 201910627481 A CN201910627481 A CN 201910627481A CN 110350779 B CN110350779 B CN 110350779B
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- transformer bank
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- 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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power supply energy storage control system for a level meter, and belongs to the field of radar level meters. The system at least comprises an isolated 4-20mA power supply component, an energy storage capacitor and a control circuit; the isolated 4-20mA power supply assembly comprises two isolated transformer banks, a switching tube, an operational amplifier and a voltage-stabilizing diode array, wherein the first isolated transformer bank is connected with the voltage-stabilizing diode array, the second isolated transformer bank is connected with the operational amplifier, and the switching tube is connected between the first isolated transformer bank and the operational amplifier; the isolated 4-20mA power supply component is connected with a booster circuit and an MCU control circuit in the control circuit; the control circuit also comprises a voltage reduction circuit and a discharge switch; the problem that the existing two-wire system 4-20mA system cannot meet the power supply requirement of the material level meter with high energy consumption in the working period is solved; the power supply requirement of the level meter with high energy consumption in the working period is met, and the explosion-proof level and the safety of the level meter are improved.
Description
Technical Field
The embodiment of the invention relates to the field of radar level meters, in particular to a power supply energy storage control system for a level meter.
Background
In the industrial production process, the radar level gauge plays an important role in ensuring product quality, production safety, economic benefits and the like. At present, the level measurement principle mainly includes two types, namely pulse Type (TDR) and Frequency Modulation Continuous Wave (FMCW). The general FMCW radar level gauge has a functional block diagram as shown in FIG. 1. the FMCW frequency modulated continuous wave level gauge utilizes frequency difference information of the frequency modulated continuous wave to measure the level, thereby reducing the requirement for the amplitude of the reflected signal and improving the measurement reliability and precision.
As the measurement accuracy and range distance of level gauges are continuously increased, the power levels required for transmit power and receive signal processing are correspondingly increased. Radar level gauges in measuring tanks are usually connected with a two-wire interface, where only two wires are used both for supplying limited power to the level gauge and for transmitting measurement signals for measurement and processing. Thus, in the case of a 4-20mA loop, the available power depends on the signal value of the level gauge, resulting in a very limited power being available during periods of low signal value (e.g. about 4 mA), even during periods of high signal value (e.g. about 20 mA), which may not be sufficient to power the processing circuitry and the microwave transmitter during the measurement cycle.
Disclosure of Invention
In order to solve the problems of the prior art, embodiments of the present invention provide a power supply energy storage control system for a level gauge. The technical scheme is as follows:
in a first aspect, a power supply energy storage control system for a level gauge is provided, the system at least comprising an isolated 4-20mA power supply assembly, an energy storage capacitor, and a control circuit;
the isolated 4-20mA power supply assembly comprises two isolated transformer banks, a switching tube, an operational amplifier and a voltage-stabilizing diode array, wherein the input end of the first isolated transformer bank is connected with the voltage-stabilizing diode array, the second isolated transformer bank is connected with the operational amplifier, and the switching tube is connected between the first isolated transformer bank and the operational amplifier;
the isolated 4-20mA power supply component is connected with a booster circuit and an MCU control circuit in the control circuit;
the control circuit also comprises a voltage reduction circuit and a discharge switch, the voltage boosting circuit is connected with the energy storage capacitor through the current limiting resistor, the energy storage capacitor is connected with the voltage reduction circuit through the discharge switch, and the MCU control circuit is connected with the discharge switch;
the MCU control circuit is used for controlling the state of the discharge switch and generating a 4-20mA analog signal corresponding to the level measurement data.
Optionally, the isolated 4-20mA power supply assembly is connected with an external power supply and a PLC data port;
the voltage reduction circuit in the control circuit is connected with the DSP processing unit, the transmitting link and the receiving link.
Optionally, the switching tube is a field effect tube;
the output end of the operational amplifier is connected with the grid electrode of the field effect tube, and the drain electrode of the field effect tube is connected with the first isolation type transformer bank.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the power supply energy storage control system for the level meter is integrated in the level meter system, the system at least comprises an isolation type 4-20mA power supply assembly, an energy storage capacitor and a control circuit, the isolation type 4-20mA power supply assembly comprises two isolation type transformer banks, a switch tube, an operational amplifier and a voltage stabilizing diode array, the input end of a first isolation type transformer bank is connected with the voltage stabilizing diode array, a second isolation type transformer bank is connected with the operational amplifier, and the switch tube is connected between the first isolation type transformer bank and the operational amplifier; the isolated 4-20mA power supply component is connected with a booster circuit and an MCU control circuit in the control circuit; the control circuit also comprises a voltage reduction circuit and a discharge switch, the voltage boosting circuit is connected with the energy storage capacitor through the current limiting resistor, the energy storage capacitor is connected with the voltage reduction circuit through the discharge switch, and the MCU control circuit is connected with the discharge switch; the problem that the existing two-wire system 4-20mA system cannot meet the power supply requirement of the material level meter with high energy consumption in the working period is solved; the power supply requirement of the level meter with high energy consumption in the working period is met, and the explosion-proof level and the safety of the level meter are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an online people counting method;
FIG. 2 is a schematic diagram of a power supply energy storage control system for a level gauge according to an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating an isolated 4-20mA power supply assembly in accordance with an exemplary embodiment;
fig. 4 is a schematic diagram illustrating connection of a storage capacitor to a control circuit in accordance with an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 is a schematic diagram of a power supply energy storage control system for a level gauge integrated therein according to an embodiment of the present application.
As shown in FIG. 2, the power supply energy storage control system for the level gauge at least comprises an isolated 4-20mA power supply assembly 10, an energy storage capacitor C1 and a control circuit.
The isolation type 4-20mA power supply component is used for simultaneously completing isolation conversion of power supply voltage and isolation decoupling work of 4-20mA signals.
As shown in fig. 2, the isolated 4-20mA power supply assembly includes two isolated transformer banks, i.e., a first isolated transformer bank S1 and a second isolated transformer bank S2, and further includes a switching tube Q1, a zener diode array D2, and an operational amplifier a 1.
The input end of the first isolated transformer bank S1 is connected with a zener diode array D2. Specifically, the cathodes of the zener diode array D2 are respectively connected to the first input terminals of the first isolated transformer bank S1, and the anodes of the zener diode array D2 are respectively connected to the second input terminals of the first isolated transformer bank S1. The number of zener diodes included in the zener diode array D2 is determined according to actual needs.
The second isolated transformer bank S2 is connected to an operational amplifier a 1. Specifically, a first output terminal of the second isolated transformer bank S2 is connected to a non-inverting input terminal of the operational amplifier a1, and an inverting input terminal of the operational amplifier a1 is connected to a second output terminal of the second isolated transformer bank S2 through the first resistor R3.
A switching tube Q1 is connected between the second input end of the first isolation transformer bank S1 and the output end of the operational amplifier a 1.
Optionally, the switching tube Q1 is a field effect tube. Specifically, the output end of the operational amplifier a1 is connected to the gate of the switching tube Q1, the drain of the switching tube Q1 is connected to the second input end of the first isolated transformer group S1, and the source of the switching tube Q1 is connected to the common end of the first resistor R3 and the inverting input end of the operational amplifier a 1.
In fig. 2, a port Vin represents an external power input port; the port IO represents a 4-20mA signal output port, and the port VO + represents a voltage conversion output port; the port Si + represents a positive and negative signal conversion output port; port 0V/Si-represents the negative signal switching output port/0 potential port.
As shown in fig. 2, a first input terminal of a first isolated transformer bank S1 in the isolated 4-20mA power supply assembly is connected to an external power supply, which is 24VDC, and a second output terminal of a second isolated transformer bank S2 in the isolated 4-20mA power supply assembly is connected to the PLC data port.
In the isolation type 4-20mA power supply assembly, a voltage stabilizing diode array and a first isolation type transformer bank realize a voltage conversion function; the operational amplifier A1, the switching tube Q1 and the first resistor R3 form a feedback type coupling circuit to realize signal coupling.
The isolated 4-20mA power supply assembly is connected with a booster circuit 20 and an MCU control circuit 30 in the control circuit.
The control circuit further includes a voltage step-down circuit 40 and a discharge switch K1.
The first output end of the first isolated transformer group S1 is connected with the anode of a first diode D1 through a boosting circuit 20, the cathode of the first diode D1 is connected with an energy storage capacitor C1 through a current limiting resistor R1, one end of a discharging switch K1 is connected with the common end of the current limiting resistor R1 and the energy storage capacitor C1, the other end of the discharging switch K1 is connected with a voltage reducing circuit 40, and the first input end of the second isolated transformer group S2 is connected with the discharging switch K1 through an MCU control circuit 30. A second output of the first isolated transformer bank S1 and a second input of the second isolated transformer bank S2 are both grounded.
The MCU control circuit 30 is used to control the state of the discharge switch K1 and to generate a 4-20mA analog signal corresponding to the level measurement data.
The voltage reduction circuit 40 in the control circuit is connected with the DSP processing unit 50, the transmission link 60 and the receiving link 70.
Optionally, the energy storage capacitor is an aluminum electrolytic capacitor.
Optionally, in the control circuit, the Boost circuit is a Boost circuit, and the Buck circuit is a Buck circuit.
The booster circuit 20 receives the isolated power supply output from the isolated 4-20mA power supply unit and performs a boosting process. The voltage rise is beneficial for the storage capacitor C1 to store more charge. The current limiting resistor R1 is used for controlling the current magnitude when the energy storage capacitor is charged and discharged.
During the measuring period of the level meter, the MCU control circuit controls the discharge switch K1 to be conducted, and the energy storage capacitor and the isolated 4-20mA power supply assembly provide power.
In the non-measuring period of the level meter, the MCU control circuit controls the discharge switch K1 to be switched off, and the energy storage capacitor stores electric charge.
In the control circuit, during the measurement period of the level gauge, the MCU control circuit 30 controls the discharging switch K1 to be turned on, and the voltage-reducing circuit 40 performs voltage-reducing processing to release current for the DSP processing unit 50, the Tx transmitting link 60, and the Rx receiving link 70 to use.
When the isolated 4-20mA power supply component 10 receives 24VDC power supply from an external power supply, the 4-20mA analog signal provided by the MCU control circuit 30 is coupled and output to the PLC for data monitoring. The isolation between the power supply and the signal wire is completed at the same time at the level of the isolation type 4-20mA power supply component, the isolation of the 4-20mA signal wire or the isolation of the power circuit is not needed, and the signal and the power supply provided for the later stage only need to be processed by a simple signal or stored by the power supply.
As shown in figure 1, the power supply energy storage control system for the level meter simplifies system interfaces, the external interface only has two-wire system power supply signal interfaces, the internal interface only has a pair of signal interfaces and a pair of power supply interfaces, and the internal and external work flows are simple and clear.
In summary, the power supply energy storage control system for a level meter provided by the embodiment of the present application is integrated inside a level meter system, and the system at least includes an isolated 4-20mA power supply assembly, an energy storage capacitor, and a control circuit, where the isolated 4-20mA power supply assembly includes two isolated transformer banks, a switch tube, an operational amplifier, and a zener diode array, an input end of a first isolated transformer bank is connected with the zener diode array, a second isolated transformer bank is connected with the operational amplifier, and the switch tube is connected between the first isolated transformer bank and the operational amplifier; the isolated 4-20mA power supply component is connected with a booster circuit and an MCU control circuit in the control circuit; the control circuit also comprises a voltage reduction circuit and a discharge switch, the voltage boosting circuit is connected with the energy storage capacitor through the current limiting resistor, the energy storage capacitor is connected with the voltage reduction circuit through the discharge switch, and the MCU control circuit is connected with the discharge switch; the problem that the existing two-wire system 4-20mA system cannot meet the power supply requirement of the material level meter with high energy consumption in the working period is solved; the power supply requirement of the level meter with high energy consumption in the working period is met, and the explosion-proof level and the safety of the level meter are improved.
It should be noted that: the above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (2)
1. A power supply energy storage control system for a level meter is characterized by at least comprising an isolated 4-20mA power supply assembly, an energy storage capacitor and a control circuit;
the isolation type 4-20mA power supply component comprises two isolation type transformer banks, a switch tube, an operational amplifier and a voltage stabilizing diode array, the cathodes of the voltage stabilizing diode arrays are respectively connected with the first input end of the first isolated transformer bank, the first input end of the first isolated transformer bank is also connected with an external power supply, the anodes of the voltage-stabilizing diode arrays are respectively connected with the second input end of the first isolated transformer bank, the first output end of the second isolated transformer bank is connected with the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected with the second output end of the second isolated transformer bank through a first resistor, the second output end of the second isolated transformer bank is also connected with a PLC data port, and the switching tube is connected between the second input end of the first isolated transformer bank and the output end of the operational amplifier; the isolation type 4-20mA power supply component simultaneously completes the internal and external isolation of the power supply and the signal wire;
the isolated 4-20mA power supply assembly is connected with a booster circuit and an MCU control circuit in the control circuit, the control circuit further comprises a voltage reduction circuit and a discharge switch, a first output end of the first isolated transformer group is connected with an anode of a first diode through the booster circuit, a cathode of the first diode is connected with an energy storage capacitor through a current limiting resistor, one end of the discharge switch is connected with a common end of the current limiting resistor and the energy storage capacitor, and the other end of the discharge switch is connected with the voltage reduction circuit; the first input end of the second isolated transformer bank is connected with the discharge switch through the MCU control circuit, a voltage reduction circuit in the control circuit is connected with the DSP processing unit, the transmitting link and the receiving link, and the second output end of the first isolated transformer bank and the second input end of the second isolated transformer bank are both grounded;
the MCU control circuit is used for controlling the state of the discharge switch and generating a 4-20mA analog signal corresponding to the level measurement data.
2. A power supply energy storage control system for a level gauge as claimed in claim 1, wherein said switching tube is a field effect tube;
the output end of the operational amplifier is connected with the grid electrode of the field effect transistor, the source electrode of the field effect transistor is connected with the first resistor and the common end of the inverting input end of the operational amplifier, and the drain electrode of the field effect transistor is connected with the second input end of the first isolation type transformer bank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910627481.1A CN110350779B (en) | 2019-07-12 | 2019-07-12 | Power supply energy storage control system for level meter |
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| CN201910627481.1A CN110350779B (en) | 2019-07-12 | 2019-07-12 | Power supply energy storage control system for level meter |
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| CN110350779A CN110350779A (en) | 2019-10-18 |
| CN110350779B true CN110350779B (en) | 2020-09-11 |
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| CN101404842B (en) * | 2008-10-15 | 2011-09-14 | 江阴旺达电子有限公司 | Three-wire system high-power LED driver |
| CN101453169B (en) * | 2008-12-02 | 2011-07-06 | 广州金升阳科技有限公司 | Self-oscillation starting output end controlled anti exciting converter |
| CN103560778B (en) * | 2013-10-16 | 2016-04-20 | 广州金升阳科技有限公司 | A kind of two-wire system signal-isolated 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 |
| US10158297B1 (en) * | 2017-06-20 | 2018-12-18 | Infineon Technologies Austria Ag | 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 |
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