CN112986745B - Load monitoring device integrating sampling and power supply energy taking and control method thereof - Google Patents
Load monitoring device integrating sampling and power supply energy taking and control method thereof Download PDFInfo
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- CN112986745B CN112986745B CN202110478061.9A CN202110478061A CN112986745B CN 112986745 B CN112986745 B CN 112986745B CN 202110478061 A CN202110478061 A CN 202110478061A CN 112986745 B CN112986745 B CN 112986745B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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Abstract
The invention discloses a load monitoring device integrating sampling and power supply energy taking and a control method thereof, and relates to the technical field of power grid load monitoring. The load monitoring device integrating sampling and power supply energy taking and the control method thereof comprise a current transformer current sampling circuit, a current transformer energy taking circuit and a Rogowski coil current sampling circuit. According to the load monitoring device integrating sampling and power supply energy taking and the control method thereof, the accuracy of load data on a line is ensured through a high-precision and high-sampling-rate acquisition circuit, meanwhile, the sufficient range of the sampled data is ensured by adopting a synchronous sampling mode of a Rogowski coil and a current transformer, the safety of the device and the accuracy of the sampled data are ensured when overload and surge occur, the defects of magnetic saturation and hysteresis of the current transformer are effectively overcome, and the seamless switching between the standby power supply energy taking and the current data acquisition is realized by adopting a PWM (pulse width modulation) mode.
Description
Technical Field
The invention relates to the technical field of power grid load monitoring, in particular to a load monitoring device integrating sampling and power supply energy taking and a control method thereof.
Background
In the smart power grid, accurate data acquisition and load monitoring are the basis of the safe and economic operation of the whole power system. Therefore, the monitoring of the high-voltage line current is more important, and accurate and comprehensive current data acquisition and load monitoring play a crucial role in load transfer, troubleshooting and line loss positioning.
The load monitoring device who adopts at present is mostly traditional current transformer sampling device, and it has the degree of accuracy height, little characteristics to the influence of transmission and distribution lines. However, due to hysteresis and magnetic saturation phenomena existing in the CT, such devices cannot bear impact caused by line overload and surge, and the safety guarantee is insufficient. This type of device adopts two kinds of power supply modes simultaneously usually, one kind is the dry battery power supply, and this kind of power supply mode duration is limited, and the device need be dismantled repeatedly and change the battery, consumes manpower and materials time, and need cooperate the maintenance work that has a power failure, and another kind is the lithium battery power supply mode of getting the electricity from CT, and this kind of mode can't monitor line current for lithium battery charging phase, can not guarantee the comprehensiveness and the reliability of electric current data acquisition.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a load monitoring device integrating sampling and power supply energy taking and a control method thereof, and solves the problems that the traditional load detection cannot cope with the impact caused by line overload and surge and the power supply mode is unreasonable.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a load monitoring device integrating sampling and power supply energy taking comprises a current transformer, a turn-off bridge rectifier circuit, an MOSFET switch circuit, a standby power supply intelligent charging and discharging circuit, a standby power supply, a differential amplification circuit, a single chip microcomputer main control unit, a remote communication circuit, a Rogowski coil, an integrating circuit and an absolute value rectifier circuit. The secondary side of the current transformer is connected with a turn-off bridge rectifier circuit, one end of the turn-off bridge rectifier circuit is connected with a first PWM signal output port csprotect of a main control unit of the single chip microcomputer, the other end of the turn-off bridge rectifier circuit is connected with a MOSFET switch circuit, one end of the MOSFET switch circuit is connected with a second PWM signal output port csync of the main control unit of the single chip microcomputer, one end of the MOSFET switch circuit is connected with an intelligent charging and discharging circuit of a standby power supply, the intelligent charging and discharging circuit of the standby power supply is connected with the standby power supply, the output end of the intelligent charging and discharging circuit of the standby power supply is respectively connected with a differential amplification circuit, a remote communication circuit, a chip power supply port of the main control unit of the single chip microcomputer, an integral circuit and an absolute value rectifier circuit, the other end of the MOSFET switch circuit is connected with the differential amplification circuit, and the other end of the differential amplification circuit is connected with a first sampling port csCT of the main control unit of the single chip microcomputer. The secondary side of the Rogowski coil is connected with one end of the integrating circuit, the other end of the integrating circuit is connected with one end of the absolute value rectifying circuit, and the other end of the absolute value rectifying circuit is connected with a second sampling port csrog of the singlechip main control unit. And a remote communication port of the singlechip main control unit is connected with a remote communication circuit. When the first PWM signal output port csprotect of the singlechip main control unit and the second PWM signal output port csync of the singlechip main control unit are at low level simultaneously, the current transformer, the turn-off bridge rectifier circuit and the MOSFET switch circuit form a current transformer energy-taking circuit, when the first PWM signal output port csprotect of the singlechip main control unit is at low level and the second PWM signal output port csync of the singlechip main control unit is at high level simultaneously, the current transformer, the turn-off bridge rectifier circuit, the MOSFET switch circuit and the differential amplifier circuit form a current transformer current sampling circuit, and the Rogowski coil, the integrating circuit and the absolute value rectifier circuit form a Rogowski coil current sampling circuit.
Preferably, the turn-off bridge rectifier circuit is used for rectifying and outputting alternating current obtained by sensing the secondary side of the current transformer, and meanwhile, the secondary side of the current transformer is short-circuited when a line is overloaded or surge current occurs, so that the safety of the device is ensured.
Preferably, the MOSFET switch circuit is used for seamlessly switching between the current transformer energy obtaining circuit and the current transformer current sampling circuit.
Preferably, the intelligent charging and discharging circuit of the standby power supply is used for charging the standby power supply.
Preferably, the standby power supply is used for providing required direct current for the device system through the intelligent charging and discharging circuit of the standby power supply.
Preferably, the differential amplification circuit is used for amplifying the secondary side sampling current signal value of the current transformer and outputting the secondary side sampling current signal value to the singlechip main control unit for data processing.
Preferably, the single chip microcomputer main control unit is used for receiving current values acquired by the rogowski coil current sampling circuit and the current transformer current sampling circuit, performing data comparison, selecting a current value output by the current transformer when the current value is within a rated current range of the current transformer, selecting a current value output by the rogowski coil current sampling circuit when the current value reaches the rated current value of the current transformer, sending a signal to a bridge rectifier circuit which can be switched off to short circuit the secondary side of the current transformer until the current value output by the rogowski coil current sampling circuit is reduced to be within the rated current value of the current transformer, and sending a signal to recover the current transformer current sampling circuit to work. Meanwhile, the single chip microcomputer main control unit monitors the voltage value of the standby power supply, and when the voltage of the standby power supply is reduced, the single chip microcomputer main control unit sends a signal to the MOSFET switching circuit to switch the current sampling circuit of the current transformer to the current transformer energy taking circuit to charge the standby power supply. The singlechip main control unit packs and transmits the acquired current data to a user terminal through a remote communication circuit at regular intervals according to user setting.
Preferably, the remote communication circuit is used for packaging and transmitting the current data collected by the device to the user terminal.
Preferably, the integrating circuit is configured to perform integration processing on the current differential value acquired by the rogowski coil to obtain actual line current data.
Preferably, the absolute value rectifying circuit is used for performing absolute value rectifying processing on the alternating current data processed by the integrating circuit to obtain a direct current digital quantity acceptable by the main control unit of the single chip microcomputer.
A control method of a load monitoring device integrating sampling and power supply energy taking comprises a measuring circuit, and comprises a load monitoring device integrating sampling and power supply energy taking, a current transformer current sampling circuit, a current transformer energy taking circuit and a Rogowski coil current sampling circuit, wherein the current transformer current sampling circuit is formed by combining a turn-off bridge rectifier circuit, an MOSFET switch circuit and a differential amplification circuit, the current transformer energy taking circuit is formed by combining a turn-off bridge rectifier circuit and an MOSFET switch circuit, the Rogowski coil current sampling circuit is formed by combining a Rogowski coil, an integrating circuit and an absolute value rectifier circuit, the main edge of the current transformer is arranged on the measuring circuit, and the main edge of the Rogowski coil is arranged on the measuring circuit, and the method comprises the following steps:
the method comprises the following steps: the standby power supply generates 4.2V direct current VDD, -4.2V direct current VEE and 3.3V direct current VCC through the intelligent charging and discharging circuit of the standby power supply to supply power to a system chip of the device;
step two: initializing a device system;
step three: a first PWM signal output port csprotect of the main control unit of the single chip microcomputer outputs high level, at the moment, the turn-off bridge type rectifying circuit is in a turn-off state, and the secondary side of the current transformer is in a short-circuit state;
step four: the Rogowski coil current sampling circuit collects line side current data and transmits the line side current data to the singlechip main control unit;
step five: the main control unit of the single chip microcomputer judges whether the current value exceeds the rated current value of the current transformer, if so, the step four is returned to; otherwise, entering the step six;
step six: the first PWM signal output port csprotect of the main control unit of the singlechip outputs low level, and at the moment, the bridge rectifier circuit can be switched off and is in a switching-on state;
step seven: the main control unit of the single chip microcomputer monitors whether the voltage of the standby power supply is reduced or not, and if the voltage of the standby power supply is reduced, the step eight is carried out; otherwise, entering the step ten;
step eight: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs low level, and the device is in the state of an energy obtaining circuit of a current transformer at the moment and charges a standby power supply through an intelligent charging and discharging circuit of the standby power supply;
step nine: the main control unit of the single chip microcomputer monitors whether the voltage of the standby power supply is full, and if the voltage of the standby power supply is not full, the step eight is carried out; otherwise, entering the step ten;
step ten: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs high level, the device is in the current sampling circuit state of the current transformer at the moment, and the current collected by the current transformer and the current collected by the Rogowski coil are transmitted to the main control unit of the single chip microcomputer together;
step eleven: the main control unit of the single chip microcomputer judges whether the current exceeds the rated current range of the current transformer, and if the current exceeds the rated current range of the current transformer, the step three is carried out; otherwise, entering the step twelve;
step twelve: the singlechip main control unit judges whether a sampling period set by a user is reached, and if the sampling period is reached, the singlechip main control unit packs and transmits data to a user terminal through a remote communication circuit; otherwise, sampling is continued.
According to the load monitoring device integrating sampling and power supply energy taking and the control method thereof, the accuracy of load data on a line is ensured through a high-precision and high-sampling-rate acquisition circuit, meanwhile, the sufficient range of the sampled data is ensured by adopting a synchronous sampling mode of a Rogowski coil and a current transformer, the safety of the device and the accuracy of the sampled data are ensured when overload and surge occur, the defects of magnetic saturation and hysteresis of the current transformer are effectively overcome, and the seamless switching between the standby power supply energy taking and the current data acquisition is realized by adopting a PWM (pulse width modulation) mode.
(III) advantageous effects
The invention provides a load monitoring device integrating sampling and power supply energy taking and a control method thereof. The method has the following beneficial effects:
(1) the invention adopts the synchronous sampling mode of the Rogowski coil and the current transformer to ensure that the device has enough sampling range, ensures the safety of the device and the accuracy of sampling data when overload and surge occur, and effectively makes up the defects of magnetic saturation and magnetic hysteresis of the current transformer.
(2) According to the invention, the current transformer is used for acquiring energy from the circuit and charging the standby power supply, the device has long endurance time and long working time, the device does not need to be dismantled and replaced with the standby power supply or charged, manpower, material resources and time are saved, and the device is ensured to efficiently complete a load monitoring task.
(3) According to the invention, the high-frequency PWM signal is output by the singlechip main control unit, the MOSFET switching circuit is controlled to perform seamless switching between the current transformer current sampling circuit and the current transformer energy taking circuit, the switching smoothness is ensured, the stable operation of the device is ensured, and the current sampling is accurate and precise.
(4) According to the invention, through a sampling mode of double sampling of the Rogowski coil and the current transformer, a small current is sampled by the current transformer, a large current is sampled by the Rogowski coil and the current transformer is turned off, and simultaneously, current peak data is judged in real time, so that all-weather load accurate monitoring is realized, the accuracy and the comprehensiveness of data are ensured, and the safety of the device and the stable operation of a power grid are ensured.
Drawings
FIG. 1 is a block diagram of the hardware architecture of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a turn-off bridge rectifier circuit according to the present invention;
FIG. 3 is a schematic diagram of a MOSFET switching circuit;
FIG. 4 is a schematic diagram of a differential amplifier circuit;
FIG. 5 is a schematic diagram of a current sampling circuit of the current transformer;
FIG. 6 is a schematic diagram of an energy-taking circuit of the current transformer;
FIG. 7 is a schematic diagram of an integration circuit;
FIG. 8 is an absolute value rectifier circuit diagram;
FIG. 9 is a schematic diagram of a Rogowski coil current sampling circuit;
FIG. 10 is a schematic diagram of the overall sampling energy extraction of the present invention;
FIG. 11 is a schematic circuit diagram of a master control unit of the single chip microcomputer;
fig. 12 is a flowchart of a control method of a load monitoring apparatus integrating sampling and power supply energy taking according to an embodiment of the present invention.
Wherein: 1. a current transformer current sampling circuit; 2. a current transformer energy taking circuit; 3. a Rogowski coil current sampling circuit;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the utility model provides a load monitoring devices that sampling and power were got can an organic whole, includes current transformer, controller and rogowski coil, current transformer is connected with the controller, the rogowski coil is connected with the controller, the power and the current transformer of controller are connected, be provided with between current transformer and the controller and turn-off bridge type rectifier circuit, turn-off bridge type rectifier circuit is connected with the controller.
The turn-off bridge type rectifying circuit is used for rectifying and outputting alternating current obtained by sensing the secondary side of the current transformer, and meanwhile, when a line is overloaded or surge current occurs, the secondary side of the current transformer is short-circuited, so that the safety of the device is ensured.
The line side alternating current sensed by the current transformer is subjected to bridge rectification output through the turn-off bridge rectification circuit, and is supplied to a standby power supply for charging or is transmitted to the singlechip main control unit for data analysis. The initial state of a first PWM signal output port csProtect signal of a sixteenth pin of the singlechip main control unit U4 is high level, at the moment, the turn-off bridge type rectifying circuit is in a turn-off state, the secondary side of the current transformer is short-circuited and does not output current, the device is prevented from being damaged by overcharge of a standby power supply or overload and surge, and when the current at the line side is in the rated current range of the current transformer, the singlechip main control unit sends out a PWM pulse signal to control the circuit to be turned on and off.
The Rogowski coil current sampling circuit is formed by combining a Rogowski coil, an integrating circuit and an absolute value rectifying circuit. A schematic diagram of the rogowski coil current sampling circuit is shown in fig. 9. The differential value of the current collected by the secondary side of the Rogowski coil is subjected to integral conversion by an integrating circuit to obtain the original quantity of the current on the line side, the absolute value rectification processing is carried out on the alternating current signal by an absolute value rectification circuit, the negative half cycle of the sinusoidal signal is converted into a forward digital quantity which can be identified by a singlechip main control unit and is transmitted to the singlechip main control unit, and the singlechip main control unit judges whether the current value exceeds the rated current range of a current transformer or not according to the line current value collected by a Rogowski coil current sampling circuit and decides whether a bridge rectification circuit is switched off or not to ensure the safe and reliable operation of the device. Meanwhile, when the current transformer is in a turn-off state or a current transformer is in an energy-obtaining state, the current of the line is monitored in real time and transmitted to the single chip microcomputer, and comprehensiveness and reliability of current sampling data are guaranteed.
The singlechip main control unit is used for receiving current values acquired by the Rogowski coil current sampling circuit and the current transformer current sampling circuit, performing data comparison, selecting a current value output by the current transformer when the current value is within the rated current range of the current transformer, selecting the current value output by the Rogowski coil current sampling circuit when the current value reaches the rated current value of the current transformer, sending a signal to the bridge type rectifying circuit which can be switched off to short circuit the secondary side of the current transformer until the current value output by the Rogowski coil current sampling circuit is reduced to be within the rated current value of the current transformer, and then sending the signal to restore the work of the current transformer current sampling circuit. Meanwhile, the single chip microcomputer main control unit monitors the voltage value of the standby power supply, and when the voltage of the standby power supply is reduced, the single chip microcomputer main control unit sends a signal to the MOSFET switching circuit to switch the current sampling circuit of the current transformer to the current transformer energy taking circuit to charge the standby power supply. The singlechip main control unit packs and transmits the acquired current data to the user terminal through the remote communication circuit at regular intervals according to the setting of a user.
Example 2:
in addition to embodiment 1, an integrating circuit and an absolute value rectifying circuit are connected in series between the rogowski coil and the controller, and the secondary side of the rogowski coil is connected to the integrating circuit.
Example 3:
on the basis of the embodiment 2, a differential amplifying circuit is arranged between the turn-off bridge rectifier circuit and the controller.
Example 4:
on the basis of embodiment 3, the controller is a single chip microcomputer main control unit, a first PWM signal output port csprotect of the single chip microcomputer main control unit is connected with a turn-off bridge rectifier circuit, a first sampling port csCT of the single chip microcomputer main control unit is connected with a differential amplification circuit, a remote communication port of the single chip microcomputer main control unit is connected with a remote communication circuit, and a second sampling port csrog of the single chip microcomputer main control unit is electrically connected with an absolute value rectifier circuit.
And the remote communication circuit is used for packaging and transmitting the current data acquired by the device to the user terminal.
Example 5:
on the basis of the embodiment 4, the intelligent charging and discharging circuit of the standby power supply and the standby power supply are included, and the intelligent charging and discharging circuit of the standby power supply is respectively connected with the remote communication circuit, the integrating circuit, the absolute value rectifying circuit, the differential amplifying circuit and the standby power supply.
And the differential amplification circuit is used for amplifying the secondary side sampling current signal value of the current transformer and outputting the value to the singlechip main control unit for data processing.
Through the differential amplification circuit, the single chip microcomputer main control unit can receive the real-time current data on the line side sensed by the current transformer, analyze whether the current data exceeds the rated current range of the current transformer, make a judgment on whether the bridge rectifier circuit is turned off or not, and store and send the acquired current data. Meanwhile, the third TVS diode can protect the circuit from being damaged by rapid and destructive voltage surge, the first electrostatic impedor can protect the two high-frequency signal lines from being influenced by electrostatic discharge and other transients, and the high-speed signal lines can be protected under the condition of no voltage.
The standby power supply is used for providing required direct current for the device system; the main control unit of the single chip microcomputer adopts STM32F103C8T 6.
The integrating circuit is used for integrating the current differential value acquired by the Rogowski coil to obtain actual line current data.
The absolute value rectifying circuit is used for carrying out absolute value rectifying processing on the alternating current data processed by the integrating circuit to obtain direct current digital quantity acceptable by the main control unit of the single chip microcomputer.
Example 6:
on the basis of the embodiment 5, a chip power supply port of the singlechip main control unit is connected with the intelligent charging and discharging circuit of the standby power supply.
Example 7:
on the basis of embodiment 6, an MOSFET switch circuit is arranged between the turn-off bridge rectifier circuit and the differential amplifier circuit, and the MOSFET switch circuit is connected with the intelligent charging and discharging circuit of the standby power supply.
The secondary side of the current transformer is connected with a turn-off bridge rectifier circuit, one end of the turn-off bridge rectifier circuit is connected with a first PWM (pulse width modulation) signal output port csprotect of a main control unit of the single chip microcomputer, the other end of the turn-off bridge rectifier circuit is connected with a MOSFET (metal oxide semiconductor field effect transistor) switch circuit, one end of the MOSFET switch circuit is connected with a second PWM signal output port csync of the main control unit of the single chip microcomputer, one end of the MOSFET switch circuit is connected with an intelligent charging and discharging circuit of a standby power supply, the intelligent charging and discharging circuit of the standby power supply is connected with a standby power supply, the output end of the intelligent charging and discharging circuit of the standby power supply is respectively connected with a differential amplification circuit, a remote communication circuit, a chip power supply port of the main control unit of the single chip microcomputer, an integrating circuit and an absolute value rectifier circuit, the other end of the MOSFET switch circuit is connected with the differential amplification circuit, and the other end of the differential amplification circuit is connected with a first sampling port csCT of the main control unit of the single chip microcomputer. The secondary side of the Rogowski coil is connected with one end of the integrating circuit, the other end of the integrating circuit is connected with one end of the absolute value rectifying circuit, and the other end of the absolute value rectifying circuit is connected with a second sampling port csrog of the singlechip main control unit. And a remote communication port of the singlechip main control unit is connected with a remote communication circuit. When the first PWM signal output port csprotect of the singlechip main control unit and the second PWM signal output port csync of the singlechip main control unit are at low level simultaneously, the current transformer, the turn-off bridge rectifier circuit and the MOSFET switch circuit form a current transformer energy-taking circuit, when the first PWM signal output port csprotect of the singlechip main control unit is at low level and the second PWM signal output port csync of the singlechip main control unit is at high level simultaneously, the current transformer, the turn-off bridge rectifier circuit, the MOSFET switch circuit and the differential amplifier circuit form a current transformer current sampling circuit, and the Rogowski coil, the integrating circuit and the absolute value rectifier circuit form a Rogowski coil current sampling circuit.
Through the MOSFET switch circuit, the device can be seamlessly switched between current sampling and standby power supply energy taking, a twelfth pin second PWM signal output port cssync of the singlechip main control unit U4 sends out a PWM high-frequency pulse signal to control the third MOS tube Q3 to be switched on and off, and the purpose of charging the standby power supply or sampling the line current is achieved by matching with the direct current output by the bridge rectifier circuit which can be switched off
Example 8:
and the MOSFET switch circuit is connected with a second PWM signal output port csync of the singlechip main control unit.
Example 9:
on the basis of any one of embodiments 1 to 8, the turn-off bridge rectifier circuit includes a first rectifier diode, a second rectifier diode, a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first precise sampling resistor, a second precise sampling resistor, a third precise sampling resistor, a fourth precise sampling resistor, and a fifth precise sampling resistor;
a first pin at the secondary side of the current transformer is connected with a phase pin of a first rectifier diode D1 and a drain of a first MOS tube Q1, a second pin at the secondary side of the current transformer is connected with a natural pin of a first rectifier diode D1 and a drain of a second MOS tube Q2, a cathode of the first rectifier diode D1 is simultaneously connected with one end of a first precision sampling resistor Rs1, one end of a second precision sampling resistor Rs2, one end of a third precision sampling resistor Rs3, one end of a fourth precision sampling resistor Rs4, one end of a fifth precision sampling resistor Rs5, the phase pin of the second rectifier diode D2 and the natural pin of a second rectifier diode D2, a cathode of the second rectifier diode D2 is connected with a standby power supply, the other end of the first precision sampling resistor Rs1, the other end of the second precision sampling resistor 2, the other end of the third precision sampling resistor Rs3, the other end of the fourth sampling resistor 4 and the other end of the fifth precision sampling resistor MOSFET 5 are simultaneously connected with a precision sampling circuit, the grid of the first MOS transistor Q1 is connected with one end of a first resistor R1 and one end of a second resistor R2, the source of the first MOS transistor Q1 is connected with the other end of the first resistor R1, the source of the second MOS transistor Q2, one end of a third resistor R3 and the ground, the other end of the second resistor R2 is connected with one end of a fourth resistor R4 and a sixteenth pin first PWM signal output port csprotect of a singlechip main control unit U4, and the other end of the fourth resistor R4 is connected with the other end of the third resistor R3 and the grid of the second MOS transistor Q2.
The current transformer current sampling circuit is formed by combining a turn-off bridge rectifier circuit, an MOSFET switch circuit and a differential amplification circuit. The schematic diagram of the current transformer sampling circuit is shown in fig. 5. When the device needs a current transformer to collect line current, a first PWM signal output port csprotect of a sixteenth pin of the singlechip main control unit U4 is converted from high level to low level, a bridge rectifier circuit is in an on state at the moment, secondary side current of the current transformer outputs direct current through bridge rectification, a second PWM signal output port cscync of a twelfth pin of the singlechip main control unit U4 is converted from low level to high level, the direct current output through the bridge rectification is output to a differential amplification circuit through 5 precise sampling resistors to achieve the purpose of signal amplification, and is transmitted to a first sampling port csCT of a thirteenth pin of the singlechip main control unit U4 to finish precise line current collection.
The current transformer energy taking circuit is formed by combining a turn-off bridge rectifier circuit and an MOSFET switch circuit. The schematic diagram of the energy-taking circuit of the current transformer is shown in fig. 6. When the single chip microcomputer main control unit U4 monitors that the standby power supply is reduced through the standby power supply intelligent charging and discharging circuit, the first PWM signal output port csprotect of the sixteenth pin of the single chip microcomputer main control unit U4 is converted from high level to low level, the bridge rectifier circuit is in an on state at the moment, the secondary side current of the current transformer outputs direct current through bridge rectification, the second PWM signal output port cscync of the twelfth pin of the single chip microcomputer main control unit U4 is converted from high level to low level, the MOSFET switching circuit is in an off state at the moment, and the bridge rectifier circuit outputs current to charge the standby power supply through the standby power supply intelligent charging and discharging circuit
The differential value of the current in the Rogowski coil surrounding ring is integrated by the integration circuit, and a normal current value on the line side is obtained.
Example 10:
on the basis of embodiment 7 or embodiment 8, the MOSFET switch circuit includes a third MOS transistor, a fifth resistor, and a sixth resistor, a drain of the third MOS transistor Q3 is connected to the other end of the first precise sampling resistor Rs1, the other end of the second precise sampling resistor Rs2, the other end of the third precise sampling resistor Rs3, the other end of the fourth precise sampling resistor Rs4, and the other end of the fifth precise sampling resistor Rs5 of the turn-off bridge rectifier circuit, a gate of the third MOS transistor Q3 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, a source of the third MOS transistor Q3 is connected to the other end of the fifth resistor R5 and ground, and the other end of the sixth resistor R6 is connected to the twelfth PWM signal output port cssync of the mcu main control unit U4.
Example 11:
in any of embodiments 4 to 8, the differential amplifier circuit includes a third TVS diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first electrostatic impeder, and a second operational amplifier, a cathode of the third TVS diode D3 is connected to one end of the seventh resistor R7, one end of the first precise sampling resistor Rs1 of the turn-off bridge rectifier circuit, one end of the second precise sampling resistor Rs2, one end of the third precise sampling resistor Rs3, one end of the fourth precise sampling resistor Rs4, one end of the fifth precise sampling resistor Rs5, a phase pin of the second rectifier diode D2, and a natural pin of the second rectifier diode D2, and the other end of the seventh resistor R7 is connected to a third pin of the first electrostatic impeder 1, one end of the tenth resistor R10, and a third pin of the second operational amplifier U2, the other end of the tenth resistor R10 is connected to the anode of the third TVS diode, the first pin of the first electrostatic impeder U1 and the ground, one end of the eighth resistor R8 is connected to the drain of the third MOS transistor Q3 of the MOSFET switch circuit, the other end of the eighth resistor R8 is connected to the second pin of the first electrostatic impeder U1, one end of the ninth resistor R9 and the second pin of the second operational amplifier U2, the other end of the ninth resistor R9 is connected to the first pin of the second operational amplifier U2 and the first sampling port csCT of the thirteenth pin of the main control unit U4 of the single chip microcomputer, the 8 th pin of the second operational amplifier U2 is connected to one end of the first capacitor C1, the fourth pin of the first electrostatic impeder U1 and 4.2V dc power supply, the other end of the first capacitor C1 is connected to the ground, the fourth pin of the second operational amplifier U2 is connected to one end of the second capacitor C2 and the end of the third capacitor C8678 of the second capacitor C3, One end of a fourth capacitor C4 is connected to the-4.2V direct current VEE, the other end of the second capacitor C2 is connected to ground, the other end of the third capacitor C3 is connected to ground, and the other end of the fourth capacitor C4 is connected to ground.
Example 12:
in any of embodiments 2 to 8, the integration circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a third operational amplifier, wherein a first pin of a secondary side of the rogowski coil is simultaneously connected to one end of the eighth capacitor C8 and one end of the eleventh resistor R11, the other end of the eighth capacitor C8 is connected to ground, a second pin of a secondary side of the rogowski coil is simultaneously connected to one end of the twelfth resistor R12 and the fifth pin of the third operational amplifier U3, the other end of the twelfth resistor R12 is connected to ground, a third pin of the secondary side of the rogowski coil is connected to ground, the other end of the eleventh resistor R11 is simultaneously connected to a sixth pin of the third operational amplifier U3, One end of a thirteenth resistor and one end of a sixth resistor C6 are connected, the other end of the thirteenth resistor R13 is connected to one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, the other end of the fourteenth resistor R14 is connected to the other end of the sixth resistor C6, one end of a ninth capacitor C9 and a seventh pin of a third operational amplifier U3, the other end of the fifteenth resistor R15 is connected to one end of an eighteenth resistor R18 and ground, the other end of the eighteenth resistor R18 is connected to one end of a sixteenth resistor R16 and one end of a seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to one end of a seventh capacitor C7 and a first pin of the third operational amplifier U3, the other end of the seventh capacitor C7 is connected to the other end of a ninth capacitor C9 and one end of a nineteenth resistor R19, the other end of the nineteenth resistor R5 is connected to the other end of the sixteenth resistor R16 and one end of the second pin of the third operational amplifier U57324, the third pin of the third operational amplifier U3 is connected to one end of a twentieth resistor R20, the other end of the twentieth resistor R20 is connected to ground, the fourth pin of the third operational amplifier U3 is connected to-4.2V dc VEE, the eighth pin of the third operational amplifier U3 is simultaneously connected to one end of a fifth capacitor C5 and 4.2V dc VDD, and the other end of the fifth capacitor C5 is connected to ground.
Example 13:
on the basis of any one of embodiments 2 to 8, the absolute value rectifying circuit includes a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a tenth capacitor, a fourth diode, a fifth diode, and a fourth operational amplifier. One end of a twenty-first resistor R21 is connected with one end of a twenty-seventh resistor R27 and a first pin of a third operational amplifier U3 of the integrating circuit, the other end of the twenty-first resistor R21 is connected with a fifth pin of a fourth operational amplifier U4, the other end of a twenty-seventh resistor R27 is connected with the other end of a fourth operational amplifier U4 and a third pin of a fourth operational amplifier U4, a sixth pin of the fourth operational amplifier U4 is connected with one end of a twenty-second resistor R22, a cathode of a fourth diode D4 and one end of a twenty-fourth resistor R24, the other end of the twenty-second resistor R22 is connected with ground, an anode of a fourth diode D4 is connected with a seventh pin of the fourth operational amplifier U4 and a cathode of a fifth diode D5, the other end of the twenty-fourth resistor R24 is connected with one end of the twenty-fifth resistor R25, an anode of the fifth diode D5 and a twenty-third resistor R23, the other end of the twenty-third resistor R23 is connected with a second pin of a fourth operational amplifier U4, the other end of the twenty-fifth resistor R25 is connected with one end of a twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is simultaneously connected with a first pin of a fourth operational amplifier U4 and a fourteenth pin second sampling port csrog of the singlechip main control unit U4, a fourth pin of the fourth operational amplifier U4 is connected with a-4.2V direct current VEE, an eighth pin of the fourth operational amplifier U4 is simultaneously connected with one end of a tenth capacitor C10 and a 4.2V direct current VDD, and the other end of the tenth capacitor C10 is connected with the ground.
The absolute value rectification circuit realizes the absolute value conversion of alternating current signals, converts negative half-cycle signals of sinusoidal current into positive digital quantity which can be received by a main control unit of the singlechip, and ensures the integrity of current signals collected by the Rogowski coil.
Example 14:
a control method of a load monitoring device integrating sampling and power supply energy taking, which comprises a measuring circuit, and comprises the load monitoring device integrating sampling and power supply energy taking in embodiment 8, a current transformer current sampling circuit 1, a current transformer energy taking circuit 2 and a rogowski coil current sampling circuit 3, wherein the current transformer current sampling circuit 1 is formed by combining a turn-off bridge rectifier circuit, an MOSFET switch circuit and a differential amplifier circuit, the current transformer energy taking circuit 2 is formed by combining a turn-off bridge rectifier circuit and an MOSFET switch circuit, the rogowski coil current sampling circuit 3 is formed by combining a rogowski coil, an integrator circuit and an absolute value rectifier circuit, a main edge of the current transformer is arranged on the measuring circuit, and a main edge of the rogowski coil is arranged on the measuring circuit, and comprises the following steps:
the method comprises the following steps: the standby power supply generates 4.2V direct current VDD, -4.2V direct current VEE and 3.3V direct current VCC through the intelligent charging and discharging circuit of the standby power supply to supply power to a system chip of the device;
step two: initializing a device system;
step three: a first PWM signal output port csprotect of the main control unit of the single chip microcomputer outputs high level, at the moment, the turn-off bridge type rectifying circuit is in a turn-off state, and the secondary side of the current transformer is in a short-circuit state;
step four: the Rogowski coil current sampling circuit (3) collects line side current data and transmits the line side current data to the singlechip main control unit;
step five: the main control unit of the single chip microcomputer judges whether the current value exceeds the rated current value of the current transformer, if so, the step four is returned to; otherwise, entering the step six;
step six: the first PWM signal output port csprotect of the main control unit of the singlechip outputs low level, and at the moment, the bridge rectifier circuit can be switched off and is in a switching-on state;
step seven: the main control unit of the single chip microcomputer monitors whether the voltage of the standby power supply is reduced or not, and if the voltage of the standby power supply is reduced, the step eight is carried out; otherwise, entering the step ten;
step eight: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs low level, and the device is in the state of an energy obtaining circuit of a current transformer at the moment and charges a standby power supply through an intelligent charging and discharging circuit of the standby power supply;
step nine: the main control unit of the single chip microcomputer monitors whether the standby power supply is full of voltage or not, and if the standby power supply is not full of voltage, the step eight is carried out; otherwise, entering the step ten;
step ten: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs high level, the device is in the current sampling circuit state of the current transformer at the moment, and the current collected by the current transformer and the current collected by the Rogowski coil are transmitted to the main control unit of the single chip microcomputer together;
step eleven: the main control unit of the single chip microcomputer judges whether the current exceeds the rated current range of the current transformer, and if the current exceeds the rated current range of the current transformer, the step three is carried out; otherwise, entering the step twelve;
step twelve: the singlechip main control unit judges whether a sampling period set by a user is reached, and if the sampling period is reached, the singlechip main control unit packs and transmits data to a user terminal through a remote communication circuit; otherwise, continuing sampling.
In summary, according to the load monitoring device integrating sampling and power supply energy taking and the control method thereof, the accuracy of load data on a line is ensured through a high-precision and high-sampling-rate acquisition circuit, meanwhile, the sufficient range of the sampled data is ensured by adopting a synchronous sampling mode of the rogowski coil and the current transformer, the safety of the device and the accuracy of the sampled data are ensured when overload and surge occur, the defects of magnetic saturation and hysteresis of the current transformer are effectively overcome, and the seamless switching between the standby power supply energy taking and the current data acquisition is realized by adopting a PWM (pulse width modulation) mode.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A control method of a load monitoring device integrating sampling and power supply energy taking comprises a current transformer, a controller and a Rogowski coil, and is characterized in that: the current transformer is connected with the controller, the Rogowski coil is connected with the controller, a power supply of the controller is connected with the current transformer, a turn-off bridge rectifier circuit is arranged between the current transformer and the controller, the turn-off bridge rectifier circuit is connected with the controller, an integral circuit and an absolute value rectifier circuit are connected in series between the Rogowski coil and the controller, the secondary side of the Rogowski coil is connected with the integral circuit, a differential amplifier circuit is arranged between the turn-off bridge rectifier circuit and the controller, the controller is a singlechip master control unit, a first PWM signal output port csprotect of the singlechip master control unit is connected with the turn-off bridge rectifier circuit, a first sampling port cscT of the singlechip master control unit is connected with the differential amplifier circuit, and a remote communication port of the singlechip master control unit is connected with a remote communication circuit, the second sampling port csrog of the single chip microcomputer main control unit is electrically connected with the absolute value rectifying circuit and comprises a standby power supply intelligent charging and discharging circuit and a standby power supply, the standby power supply intelligent charging and discharging circuit is respectively connected with the remote communication circuit, the integrating circuit, the absolute value rectifying circuit, the differential amplifying circuit and the standby power supply, the chip power supply port of the single chip microcomputer main control unit is connected with the standby power supply intelligent charging and discharging circuit, an MOSFET (metal oxide semiconductor field effect transistor) switch circuit is arranged between the turn-off bridge type rectifying circuit and the differential amplifying circuit and connected with the standby power supply intelligent charging and discharging circuit, and the MOSFET switch circuit is connected with the second PWM (pulse width modulation) signal output port cssync of the single chip microcomputer main control unit;
the energy-taking circuit (2) of the current transformer is formed by combining a turn-off bridge rectifier circuit, an MOSFET (metal oxide semiconductor field effect transistor) switching circuit and a differential amplification circuit, the energy-taking circuit (2) of the current transformer is formed by combining the turn-off bridge rectifier circuit and the MOSFET switching circuit, the current sampling circuit (3) of the Rogowski coil is formed by combining the Rogowski coil, an integrating circuit and an absolute value rectifier circuit, the main edge of the current transformer is arranged on a measuring circuit, and the main edge of the Rogowski coil is arranged on the measuring circuit;
the control method comprises the following steps:
the method comprises the following steps: the standby power supply generates 4.2V direct current VDD, -4.2V direct current VEE and 3.3V direct current VCC through the intelligent charging and discharging circuit of the standby power supply to supply power to a system chip of the device;
step two: initializing a device system;
step three: a first PWM signal output port csprotect of the main control unit of the single chip microcomputer outputs high level, at the moment, the turn-off bridge type rectifying circuit is in a turn-off state, and the secondary side of the current transformer is in a short-circuit state;
step four: the Rogowski coil current sampling circuit (3) collects line side current data and transmits the line side current data to the singlechip main control unit;
step five: the main control unit of the single chip microcomputer judges whether the current value exceeds the rated current value of the current transformer, if so, the step four is returned to; otherwise, entering the step six;
step six: the first PWM signal output port csprotect of the main control unit of the singlechip outputs low level, and at the moment, the bridge rectifier circuit can be switched off and is in a switching-on state;
step seven: the main control unit of the single chip microcomputer monitors whether the voltage of the standby power supply is reduced or not, and if the voltage of the standby power supply is reduced, the step eight is carried out; otherwise, entering the step ten;
step eight: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs low level, and the device is in the state of an energy obtaining circuit of a current transformer at the moment and charges a standby power supply through an intelligent charging and discharging circuit of the standby power supply;
step nine: the main control unit of the single chip microcomputer monitors whether the standby power supply is full of voltage or not, and if the standby power supply is not full of voltage, the step eight is carried out; otherwise, entering the step ten;
step ten: the second PWM signal output port cssync of the main control unit of the single chip microcomputer outputs high level, the device is in the current sampling circuit state of the current transformer at the moment, and the current collected by the current transformer and the current collected by the Rogowski coil are transmitted to the main control unit of the single chip microcomputer together;
step eleven: the main control unit of the single chip microcomputer judges whether the current exceeds the rated current range of the current transformer, and if the current exceeds the rated current range of the current transformer, the step III is carried out again; otherwise, go to step twelve;
step twelve: the singlechip main control unit judges whether a sampling period set by a user is reached, and if the sampling period is reached, the singlechip main control unit packs and transmits data to a user terminal through a remote communication circuit; otherwise, continuing sampling.
2. The control method for the load monitoring device integrating the sampling and the power supply energy taking as claimed in claim 1, characterized in that: the turn-off bridge type rectifying circuit comprises a first rectifying diode, a second rectifying diode, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a first precise sampling resistor, a second precise sampling resistor, a third precise sampling resistor, a fourth precise sampling resistor and a fifth precise sampling resistor;
a first pin at the secondary side of the current transformer is connected with a phase pin of a first rectifier diode D1 and a drain of a first MOS tube Q1, a second pin at the secondary side of the current transformer is connected with a natural pin of a first rectifier diode D1 and a drain of a second MOS tube Q2, a cathode of the first rectifier diode D1 is simultaneously connected with one end of a first precision sampling resistor Rs1, one end of a second precision sampling resistor Rs2, one end of a third precision sampling resistor Rs3, one end of a fourth precision sampling resistor Rs4, one end of a fifth precision sampling resistor Rs5, the phase pin of the second rectifier diode D2 and the natural pin of a second rectifier diode D2, a cathode of the second rectifier diode D2 is connected with a standby power supply, the other end of the first precision sampling resistor Rs1, the other end of the second precision sampling resistor 2, the other end of the third precision sampling resistor Rs3, the other end of the fourth sampling resistor 4 and the other end of the fifth precision sampling resistor MOSFET 5 are simultaneously connected with a precision sampling circuit, the grid of the first MOS transistor Q1 is connected with one end of a first resistor R1 and one end of a second resistor R2, the source of the first MOS transistor Q1 is connected with the other end of the first resistor R1, the source of the second MOS transistor Q2 and one end of a third resistor R3 and ground, the other end of the second resistor R2 is connected with one end of a fourth resistor R4 and a sixteenth pin first PWM signal output port csprotect of a single-chip microcomputer main control unit U4, and the other end of the fourth resistor R4 is connected with the other end of the third resistor R3 and the grid of the second MOS transistor Q2.
3. A method of controlling a sampling and power supply integration load monitoring apparatus as claimed in claim 1, wherein: the MOSFET switch circuit comprises a third MOS tube, a fifth resistor and a sixth resistor, wherein the drain electrode of the third MOS tube Q3 is simultaneously connected with the other end of a first precise sampling resistor Rs1, the other end of a second precise sampling resistor Rs2, the other end of a third precise sampling resistor Rs3, the other end of a fourth precise sampling resistor Rs4 and the other end of a fifth precise sampling resistor Rs5 of the turn-off bridge type rectification circuit, the grid electrode of the third MOS tube Q3 is simultaneously connected with one end of a fifth resistor R5 and one end of a sixth resistor R6, the source electrode of the third MOS tube Q3 is simultaneously connected with the other end of the fifth resistor R5 and the ground, and the other end of the sixth resistor R6 is connected with a twelfth pin second PWM signal output port sync of the singlechip main control unit U4.
4. The method of claim 1, wherein the step of controlling the load monitoring device comprises the steps of: the differential amplifying circuit comprises a third TVS diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first electrostatic impeder and a second operational amplifier, wherein the cathode of the third TVS diode D3 is simultaneously connected with one end of a seventh resistor R7, one end of a first precise sampling resistor Rs1, one end of a second precise sampling resistor Rs2, one end of a third precise sampling resistor Rs3, one end of a fourth precise sampling resistor Rs4, one end of a fifth precise sampling resistor Rs5, a phase pin of a second rectifier diode D2 and a natural pin of a second rectifier diode D2, the other end of the seventh resistor R7 is simultaneously connected with the third pin of the first electrostatic impeder U1, one end of a tenth resistor R10 and a third pin of the second operational amplifier U2, the other end of the tenth resistor R10 is simultaneously connected with the anode of the third resistor R35S diode, A first pin of the first electrostatic impeder U1 is connected with the ground, one end of an eighth resistor R8 is connected with a drain electrode of a third MOS transistor Q3 of the MOSFET switch circuit, the other end of an eighth resistor R8 is simultaneously connected with a second pin of the first electrostatic impeder U1, one end of a ninth resistor R9 and a second pin of a second operational amplifier U2, the other end of the ninth resistor R9 is connected with a first pin of a second operational amplifier U2 and a first sampling port csCT of a thirteenth pin of a singlechip master control unit U4, a 8 th pin of the second operational amplifier U2 is simultaneously connected with one end of a first capacitor C1, a fourth pin of the first electrostatic impeder U1 and a 4.2V dc VDD, the other end of a first capacitor C1 is connected with the ground, a fourth pin of the second operational amplifier U2 is simultaneously connected with one end of a second capacitor C2, one end of a third capacitor C3, one end of a fourth capacitor C4 and a 4.2V dc-4V dc VDD, the other terminal of the second capacitor C2 is connected to ground, the other terminal of the third capacitor C3 is connected to ground, and the other terminal of the fourth capacitor C4 is connected to ground.
5. A method of controlling a sampling and power supply integration load monitoring apparatus as claimed in claim 1, wherein: the integrating circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a third operational amplifier, wherein a first pin of a secondary side of the Rogowski coil is simultaneously connected with one end of an eighth capacitor C8 and one end of an eleventh resistor R11, the other end of an eighth capacitor C8 is connected with the ground, a second pin of the secondary side of the Rogowski coil is simultaneously connected with one end of a twelfth resistor R12 and a fifth pin of a third operational amplifier U3, the other end of a twelfth resistor R12 is connected with the ground, a third pin of the secondary side of the Rogowski coil is connected with the ground, the other end of an eleventh resistor R11 is simultaneously connected with a sixth pin of a third operational amplifier U3, one end of a thirteenth resistor and one end of a sixth capacitor C6, the other end of the thirteenth resistor R13 is connected to one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, the other end of the fourteenth resistor R14 is connected to the other end of a sixth capacitor C6, one end of a ninth capacitor C9 and a seventh pin of a third operational amplifier U3, the other end of the fifteenth resistor R15 is connected to one end of an eighteenth resistor R18 and ground, the other end of an eighteenth resistor R18 is connected to one end of a sixteenth resistor R16 and one end of a seventeenth resistor R17, the other end of a seventeenth resistor R17 is connected to one end of a seventh capacitor C7 and a first pin of the third operational amplifier U3, the other end of a seventh capacitor C7 is connected to the other end of a ninth capacitor C9 and one end of a nineteenth resistor R19, the other end of a nineteenth resistor R19 is connected to the other end of a sixteenth resistor R16 and a second pin of the third operational amplifier U3, the third pin of the third operational amplifier U3 is connected to one end of a twentieth resistor R20, the other end of the twentieth resistor R20 is connected to ground, the fourth pin of the third operational amplifier U3 is connected to-4.2V dc VEE, the eighth pin of the third operational amplifier U3 is simultaneously connected to one end of a fifth capacitor C5 and 4.2V dc VDD, and the other end of the fifth capacitor C5 is connected to ground.
6. A method of controlling a sampling and power supply integration load monitoring apparatus as claimed in claim 1, wherein: the absolute value rectifying circuit comprises a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a tenth capacitor, a fourth diode, a fifth diode and a fourth operational amplifier, wherein one end of the twenty-first resistor R21 is simultaneously connected with one end of the twenty-seventh resistor R27 and a first pin of a third operational amplifier U3 of the integrating circuit, the other end of the twenty-first resistor R21 is connected with a fifth pin of the fourth operational amplifier U4, the other end of the twenty-seventh resistor R27 is connected with the other end of a fourth operational amplifier U4 and a third pin of the fourth operational amplifier U4, a sixth pin of the fourth operational amplifier U4 is simultaneously connected with one end of a twenty-second resistor R22, a cathode of the fourth diode D4 and one end of a twenty-fourth resistor R24, the other end of the twenty-second resistor R22 is connected with the ground, the anode of the fourth diode D4 is connected to both the seventh pin of the fourth operational amplifier U4 and the cathode of the fifth diode D5, the other end of the twenty-fourth resistor R24 is connected to one end of the twenty-fifth resistor R25, an anode of the fifth diode D5 and one end of a twenty-third resistor R23 are connected, the other end of the twenty-third resistor R23 is connected to a second pin of the fourth operational amplifier U4, the other end of the twenty-fifth resistor R25 is connected to one end of a twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is connected to a first pin of the fourth operational amplifier U4 and a second sampling port csrog of a fourteenth pin of the main control unit U4 of the single chip microcomputer, a fourth pin of the fourth operational amplifier U4 is connected to the-4.2V direct current VEE, an eighth pin of the fourth operational amplifier U4 is connected to one end of the tenth capacitor C10 and the 4.2V direct current VDD, and the other end of the tenth capacitor C10 is connected to ground.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498745A (en) * | 2008-01-28 | 2009-08-05 | 西门子公司 | Current detecting device and method |
| CN101697430A (en) * | 2009-11-12 | 2010-04-21 | 上海交通大学 | Power control method based CT electricity getting device of high voltage transmission line |
| CN104569897A (en) * | 2014-12-11 | 2015-04-29 | 许继集团有限公司 | Standard Rogowski coil-based electronic current transformer calibration system |
| CN105445531A (en) * | 2014-08-14 | 2016-03-30 | 北京南瑞智芯微电子科技有限公司 | Power taking and sampling integrated current monitoring device |
| CN106093547A (en) * | 2016-08-04 | 2016-11-09 | 贵州电网有限责任公司电力科学研究院 | Rogowski coil current transformer measuring device and method based on auxiliary coil correction |
| EP3737951A1 (en) * | 2018-03-19 | 2020-11-18 | Siemens Aktiengesellschaft | Method and device for measuring an alternating current with a rogowski current transformer |
-
2021
- 2021-04-30 CN CN202110478061.9A patent/CN112986745B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498745A (en) * | 2008-01-28 | 2009-08-05 | 西门子公司 | Current detecting device and method |
| CN101697430A (en) * | 2009-11-12 | 2010-04-21 | 上海交通大学 | Power control method based CT electricity getting device of high voltage transmission line |
| CN105445531A (en) * | 2014-08-14 | 2016-03-30 | 北京南瑞智芯微电子科技有限公司 | Power taking and sampling integrated current monitoring device |
| CN104569897A (en) * | 2014-12-11 | 2015-04-29 | 许继集团有限公司 | Standard Rogowski coil-based electronic current transformer calibration system |
| CN106093547A (en) * | 2016-08-04 | 2016-11-09 | 贵州电网有限责任公司电力科学研究院 | Rogowski coil current transformer measuring device and method based on auxiliary coil correction |
| EP3737951A1 (en) * | 2018-03-19 | 2020-11-18 | Siemens Aktiengesellschaft | Method and device for measuring an alternating current with a rogowski current transformer |
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