CN104535831A - Wide-range electric energy meter based on hall sensor - Google Patents
Wide-range electric energy meter based on hall sensor Download PDFInfo
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- CN104535831A CN104535831A CN201510020131.0A CN201510020131A CN104535831A CN 104535831 A CN104535831 A CN 104535831A CN 201510020131 A CN201510020131 A CN 201510020131A CN 104535831 A CN104535831 A CN 104535831A
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Abstract
The invention discloses a wide-range electric energy meter based on a hall sensor including a hall current detection module, a voltage detection module, an MCU signal processing control module, a metering module, a display alarm communication module and a power module. The hall current detection module induces the change of current and transmits measuring results to the metering module and the MCU signal processing control module. The voltage detection module measures voltage and transmits measuring results to the metering module. The metering module transmits the processing results to the MCU signal processing control module. The MCU signal processing control module processes and stores signals output by the metering module; switching control of current detection range is carried out through electric current size transmitted by the hall current detection module. The display alarm communication module includes an LCD display module, an alarm module and a communication module. The power module supplies power to the above mentioned function modules. The wide-range electric energy meter based on the hall sensor has the functions of direct current detection and high frequency nonlinearity detection, and the capacity of resisting extra-magnetic disturbance is better.
Description
Technical field
The present invention relates to a kind of wide magnitude electrical energy meter, particularly a kind of wide magnitude electrical energy meter based on Hall element.
Background technology
Generally use electromagnetic current transducer as current sensing unit in electric energy meter, because it exists magnetic saturation and band-limited characteristic thereof, be difficult to the accurate detection realized high fdrequency component and DC current.Along with the universal use of the non-linear equipments such as power electronics in electrical network, electromagnetic current transducer can not meet the demand in market.
Hall element is a kind of broadband current sensor, can be used for the detection in various alternating current-direct current magnetic field.But because the dynamic range of open loop Hall element is general narrower, detectable changes of magnetic field amplitude is less, general only for Electric Machine Control, Hall switch etc. are to accuracy of detection and the not high occasion of dynamic range requirement, and the current detecting unit of electric energy meter requires bandwidth, wide dynamic range, with one piece of common electric energy meter 5(60) current specification of A, its current detecting dynamic range is up to 1200:1, the general detectable dynamic range of open loop Hall element only has 200:1, real requirement cannot be met, and measuring accuracy can be affected under strong magnetic interference.
Summary of the invention
For current Problems existing, the object of this invention is to provide a kind of broadband, wide dynamic range, pin-point accuracy and there is the wide magnitude electrical energy meter based on Hall element resisting outer magnetic interference ability.
This wide magnitude electrical energy meter based on Hall element provided by the invention, comprises Hall current detection module, voltage detection module, MCU signal transacting control module, metering module, display alarm communication module and power module; Hall current detection module induction current changes, and measurement result is reached metering module and MCU signal transacting control module; Measurement result is also also reached metering module by voltage detection module measuring voltage; Metering module carries out A/D conversion to signal and after compensation correction, outputs signal to MCU signal transacting control module; MCU signal transacting control module is carried out temperature compensation process to the signal that metering module exports and stores, then shows in display alarm communication module, and carries out the switching control of current detecting range by the voltage swing transmitted in Hall current detection module; Display alarm communication module comprises LCD display module, alarm module and communication module, LCD module offsets consuming electric power size and shows in real time, alarm module electric current and/or voltage excessive time carry out report to the police and by relay, power supply is disconnected, communication module is used for realizing exchanges data with the external world, comprises far-infrared communication, GPRS communicates, carrier communication communicates with 485; Power module is Hall current detection module, MCU signal transacting control module, metering module and display alarm communication module are powered.
Described Hall current detection module comprises a Hall current sensor and No. two Hall current sensors, and two Hall current sensors are open loop Hall element, and the two is vertical direction placement on pcb board.
The pcb board of described Hall current detection module is U-shaped, and below this pcb board, is provided with one for the derby detecting the shape same with this pcb board that electric current flows through.
The current detection range of a described Hall current sensor is greater than the current detection range of No. two Hall current sensors; The range of the two can by programmable device online modification; And the two is all configured with ferronickel radome.A described Hall current sensor is furnished with U-shaped radome.Described No. two Hall current sensors are furnished with C type radome.
Described Hall current detection module comprises a Hall current sensor U1 and No. two Hall current sensor U2 and switch method of remote signal circuit; Switch method of remote signal circuit comprises a switch method of remote signal circuit and No. two switch method of remote signal circuit; A switch method of remote signal circuit comprises triode Q202 and triode Q204, and No. two switch method of remote signal circuit comprise triode Q203 and triode Q205;
The detection voltage pin VDEC of a Hall current sensor U1 is by electric capacity C1 ground connection; Its output pin OUT is by resistance R1 ground connection, and this output pin is also connected with a switch method of remote signal circuit, and this output pin is also by electric capacity C3 ground connection; The power pin VDD of this chip U1 is connected with power supply VCC, and this pin is also by electric capacity C2 ground connection; The equal ground connection of power-extreme VSS and test pin TEST of this chip U1; The emitter of triode Q202 is connected with the output pin OUT of a Hall current sensor U1 by resistance R239, and its base stage is connected with the collector of triode Q204 by resistance R240, and its collector is as the output port of a switch method of remote signal circuit; The emitter of triode Q204 connects in analog, and its base stage is connected, for transmitting the switch-over control signal of MCU by the IO port of resistance R241 and MCU;
The circuit connection structure of No. two Hall current sensor U2 and the identical of a Hall current sensor U1; The circuit connection structure of No. two switch method of remote signal circuit is identical with the circuit connection structure of a switch method of remote signal circuit; No. two Hall current sensor U2 are identical with the circuit connection structure of a switch method of remote signal circuit with a Hall current sensor U1 with the circuit connection structure of No. two switch method of remote signal circuit;
The output terminal of No. two switch method of remote signal circuit is connected with the output terminal of a switch method of remote signal circuit, output signal is all sampled by resistance R245, sampled signal is connected with described metering module by after the filter network filtering that is made up of resistance R217, resistance R218 and electric capacity C209, electric capacity C210, resistance R245 and resistance R218 link be connected in analog, electric capacity C209 and electric capacity C210 not with metering module link be connected in analog.
Described voltage detection module adopts resistance pressure-dividing network to detect voltage, then signal is outputted to described metering module.
Described power module adopts transformer, switching power source chip and linear low voltage difference voltage stabilizer to power to each module of electric energy meter respectively.
The present invention can measure electric current within the scope of 0.05A ~ 200A, and normally work under the outer magnetic interference environment within 330mT, for from unidirectional magnetic interference, then this electric energy meter is not by any interference, has alternating current-direct current and detects and high frequency nonlinear component measuring ability.The present invention adopts open loop Hall element, and structural design is obviously simple than Closed Loop Hall, and eliminate complicated magnetic Circuit Design, nonlinearity can reach 5 ‰, by temperature drift after temperature compensation algorithm process can control 50ppm DEG C within.The present invention can also revise electric energy meter testing range by real-time online, and therefore the present invention is applicable to various application occasions.In addition, designed by the bonding jumper structure flowed through Hall element low-side current, detect electric current and even can reach 2000A.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is the circuit diagram of Hall current detection module of the present invention.
Fig. 3 is voltage detection module circuit diagram of the present invention.
Fig. 4 is metering module circuit diagram of the present invention.
Fig. 5 is MCU signal transacting control module circuit diagram of the present invention.
Fig. 6 is relay drive circuit figure of the present invention.
Fig. 7 is far-infrared communication circuit diagram of the present invention.
Fig. 8 is 485 telecommunication circuit figure of the present invention.
Fig. 9 is power module partial circuit figure of the present invention.
Figure 10 is metering power circuit diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention includes Hall current detection module, voltage detection module, MCU signal transacting control module, metering module, display alarm communication module and power module.
Hall current detection module induction current changes, and measurement result is reached metering module and MCU signal transacting control module.Measurement result is also also reached metering module by voltage detection module measuring voltage.Metering module carries out A/D conversion to signal and data are reached MCU signal transacting control module after a series of compensation correction computing.MCU signal transacting control module processes the signal that metering module exports and stores, then shows in display alarm communication module, and controls by the size of current transmitted in Hall current detection module the switching outputing signal range.Display alarm communication module comprises LCD display module, alarm module and communication module; LCD module offsets consuming electric power size and shows in real time; Alarm module is practicable alarm and protection operation when current/voltage is excessive; Communication module can carry out electric energy meter and the external world realizes exchanges data, comprises far-infrared communication, GPRS communication communicates with 485.Power module and Hall current detection module, MCU signal transacting control module, metering module are connected with display alarm communication module and are that it is powered.
As shown in Figure 2, Hall current detection module comprises a Hall current sensor U1 and No. two Hall current sensor U2 and switch method of remote signal circuit.Switch method of remote signal circuit comprises a switch method of remote signal circuit and No. two switch method of remote signal circuit.A switch method of remote signal circuit comprises triode Q202 and triode Q204, and No. two switch method of remote signal circuit comprise triode Q203 and triode Q205.
The detection voltage pin VDEC of a Hall current sensor U1 is by electric capacity C1 ground connection; Its output pin OUT is by resistance R1 ground connection, and this output pin is also connected with a switch method of remote signal circuit, and for transmitting input current signal IN1, this output pin is also by electric capacity C3 ground connection; The power pin VDD of this chip U1 is connected with power supply VCC, and this pin is also by electric capacity C2 ground connection; The equal ground connection of power-extreme VSS and test pin TEST of this chip U1; The emitter of triode Q202 is connected with the output pin OUT of a Hall current sensor U1 by resistance R239, and its base stage is connected with the collector of triode Q204 by resistance R240, and its collector is as the output port of a switch method of remote signal circuit; The emitter of triode Q204 connects in analog, and its base stage is connected, for transmitting the switch-over control signal of MCU by the IO port of resistance R241 and MCU;
The circuit connection structure of No. two Hall current sensor U2 and the identical of a Hall current sensor U1; The circuit connection structure of No. two switch method of remote signal circuit is identical with the circuit connection structure of a switch method of remote signal circuit; No. two Hall current sensor U2 are identical with the circuit connection structure of a switch method of remote signal circuit with a Hall current sensor U1 with the circuit connection structure of No. two switch method of remote signal circuit.
The output terminal of No. two switch method of remote signal circuit is connected with the output terminal of a switch method of remote signal circuit, output signal is all sampled by resistance R245, sampled signal is connected with metering module after passing through the filter network filtering be made up of resistance R217, resistance R218 and electric capacity C209, electric capacity C210, the link of resistance R245 and resistance R218 be connected in analog, electric capacity C209 holds with not being connected with metering module of electric capacity C210 and being connected in analog.
Hall current detection module is only to parallel direction magnetic field detection; Two pieces of Hall current sensors are vertically placed on pcb board, and are furnished with U-shaped and C type radome respectively, and radome all can be protected by ferronickel radome, serves good diamagnetic interference effect.
Two pieces of Hall current sensor chip generation ± 5A of Hall current detection module and ± 200A two groups of ranges, can realize the current detecting in the scope of 0.05A ~ 200, and this range can through programmable device online modification.
The present invention has DC detecting and high frequency nonlinear component measuring ability and has better anti-outer magnetic interference ability.
As shown in Figure 3, voltage detection module adopts resistance pressure-dividing network to detect voltage detecting, then signal is outputted to metering module.
As shown in Figure 4, metering module comprises computation chip U209.The analog power pin AVDD of computation chip U209 is connected with power supply AC-3.3V, and power supply AC-3.3V connects in analog by electric capacity C206; Its analog power negative pole pin AVSS connects in analog; It connects in analog with reference to pin REF by electric capacity C215; The positive pin UP of its voltage is connected with the positive output end of voltage detection module, for transfer overvoltage positive signal V1+; Its voltage negative pin UN is connected with the negative output terminal of voltage detection module, for transfer overvoltage negative signal V1-; Its No. two electric currents are born pin IBN and are held with transmission No. two electric current negative signal I2-of Hall current detection module and be connected; The positive pin IBP of its No. two electric currents holds with transmission No. two electric current positive signal I2+ of Hall current detection module and is connected; One electric current is born pin IAN and to be held with the positive Iin+ of input current by resistance R215 and be connected, for transmitting an electric current negative signal I1+; One electric current is born pin IAP and is born Iin-by resistance R216 and input current and hold and be connected, for transmitting No. two electric current negative signal I1-; Its diagnostic test enable pin DFTEN connects in analog by resistance R210; Its scan enable pin SCANEN connects in analog by resistance R208; Its reseting pin RSTn is connected with the anode of diode D202, and the negative electrode of this diode is connected with the I/O pin of MCU, and power supply AV-3.3V is also connected with the anode of diode D202 by resistance R222, and this reseting pin also connects digitally by electric capacity C221; Its spi bus numeral output pin SPDO is connected by the I/O pin of resistance R226 and MCU; Its spi bus numeral input pin SPDI is connected with the anode of diode D204 by resistance R227, the negative electrode of this diode is connected with the I/O pin of MCU, the I/O pin of this MCU is also connected with LCD, can be used for transmitting the continuous data in LCD display, power supply AV-3.3V is also connected with the anode of diode D204 by resistance R222; Its spi bus clock pins SPCK is connected with the anode of diode D203 by resistance R225, and the negative electrode of this diode is connected with the I/O pin of MCU, and for transmitting clock signal ADSCK, power supply AV-3.3V is also connected with the anode of diode D203 by resistance R224; Its verification pulse output pin CF1 is connected with the base stage of triode Q201 by resistance R220, the collector of this triode is connected with power supply DVCC, this collector is also connected with the negative electrode of LED 1, and the anode of this light emitting diode is connected with power supply DVCC by resistance R159; The grounded emitter of triode Q201; Its power pin VDD33 is connected with power supply AV-3.3V, and this power supply AV-3.3V connects in analog by electric capacity C201; Its power cathode VDSS connects in analog; Its digital power DCPL pin connects in analog by electric capacity C208, and this pin also connects in analog by electric capacity C207; Its spi bus sheet selects pin SPCSN to connect in analog by resistance R209; A crystal oscillator X201 is connected between its frequency input pin CTI and its rate-adaptive pacemaker pipe CTO.
Metering module adopts computation chip, carries out calculation process, and signal is exported to MCU signal transacting control module to Hall current module output signal and voltage detection module output signal.
As shown in Figure 5, MCU signal transacting control module of the present invention comprises liquid crystal drive power circuit, backlight drive circuit, interior card circuit and reset circuit.
MCU signal transacting control module of the present invention adopts MCU chip.MCU is judged by the size of current detected the Hall current detection module transmitted after computation chip process, implements to switch to control current detecting range, realizes the current detecting in 0.05A ~ 200A wide region.MCU signal transacting control module can also be calibrated computation chip parameter by calibration software.
Display alarm communication module of the present invention comprises LCD display module, alarm relay module and communication module.
LCD display module offsets consuming electric power size and shows in real time.
The concrete operations of alarm module are: when MCU detects electric current and/or voltage is excessive, are disconnected by power supply by MCU pilot relay, and simultaneously practicable sound and light alarm.
As shown in Figure 6 to 8, communication module is communicated by far-infrared communication, GPRS, carrier communication communicates with 485 forms, and realizes electric energy meter and communicates with exogenous data.
As shown in Figure 9, electric power source pair of module Hall current detection module of the present invention, metering module, MCU signal transacting control module and display alarm communication module are powered.Power module comprises battery feed circuit and electrical energy meter electricity source circuit.Power module adopts transformer, switching power source chip and linear low voltage difference voltage stabilizer to power to each module of electric energy meter respectively.
Electrical energy meter electricity source circuit comprises transformer T1, linear low voltage difference voltage stabilizer U100 and linear low voltage difference voltage stabilizer U800.AC signal is divided into two-way power circuit after transformer T1 step-down.One group of power circuit generates MCU, metering, interior card, reset and carrier power source through linear low voltage difference voltage stabilizer U100; Another road power circuit generates RS485 power supply through linear low voltage difference voltage stabilizer U800.
As shown in Figure 10, measure power circuit and comprise switching power source chip U200; The Input voltage terminal of this chip is connected with power module, and its output voltage terminal is connected with analog power AV-3.3V, provides for providing the power supply of computation chip.
Claims (9)
1. based on a wide magnitude electrical energy meter for Hall element, it is characterized in that, comprise Hall current detection module, voltage detection module, MCU signal transacting control module, metering module, display alarm communication module and power module; Hall current detection module induction current changes, and measurement result is reached metering module and MCU signal transacting control module; Measurement result is also also reached metering module by voltage detection module measuring voltage; Metering module carries out A/D conversion to signal and after compensation correction, outputs signal to MCU signal transacting control module; MCU signal transacting control module is carried out temperature compensation process to the signal that metering module exports and stores, then shows in display alarm communication module, and carries out the switching control of current detecting range by the voltage swing transmitted in Hall current detection module; Display alarm communication module comprises LCD display module, alarm module and communication module, LCD module offsets consuming electric power size and shows in real time, alarm module electric current and/or voltage excessive time carry out report to the police and by relay, power supply is disconnected, communication module is used for realizing exchanges data with the external world, comprises far-infrared communication, GPRS communicates, carrier communication communicates with 485; Power module is Hall current detection module, MCU signal transacting control module, metering module and display alarm communication module are powered.
2. the wide magnitude electrical energy meter based on Hall element according to claim 1, it is characterized in that, described Hall current detection module comprises a Hall current sensor and No. two Hall current sensors, two Hall current sensors are open loop Hall element, and the two is vertical direction placement on pcb board.
3. the wide magnitude electrical energy meter based on Hall element according to claim 1, is characterized in that, the pcb board of described Hall current detection module is U-shaped, and below this pcb board, is provided with one for the derby detecting the shape same with this pcb board that electric current flows through.
4. the wide magnitude electrical energy meter based on Hall element according to claim 2, is characterized in that, the current detection range of a described Hall current sensor is greater than the current detection range of No. two Hall current sensors; The range of the two can by programmable device online modification; And the two is all configured with ferronickel radome.
5. the wide magnitude electrical energy meter based on Hall element according to claim 2, is characterized in that, a described Hall current sensor is furnished with U-shaped radome.
6. the wide magnitude electrical energy meter based on Hall element according to claim 2, is characterized in that, described No. two Hall current sensors are furnished with C type radome.
7. the wide magnitude electrical energy meter based on Hall element according to claim 1, is characterized in that, described Hall current detection module comprises a Hall current sensor U1 and No. two Hall current sensor U2 and switch method of remote signal circuit; Switch method of remote signal circuit comprises a switch method of remote signal circuit and No. two switch method of remote signal circuit; A switch method of remote signal circuit comprises triode Q202 and triode Q204, and No. two switch method of remote signal circuit comprise triode Q203 and triode Q205;
The detection voltage pin VDEC of a Hall current sensor U1 is by electric capacity C1 ground connection; Its output pin OUT is by resistance R1 ground connection, and this output pin is also connected with a switch method of remote signal circuit, and this output pin is also by electric capacity C3 ground connection; The power pin VDD of this chip U1 is connected with power supply VCC, and this pin is also by electric capacity C2 ground connection; The equal ground connection of power-extreme VSS and test pin TEST of this chip U1; The emitter of triode Q202 is connected with the output pin OUT of a Hall current sensor U1 by resistance R239, and its base stage is connected with the collector of triode Q204 by resistance R240, and its collector is as the output port of a switch method of remote signal circuit; The emitter of triode Q204 connects in analog, and its base stage is connected, for transmitting the switch-over control signal of MCU by the IO port of resistance R241 and MCU;
The circuit connection structure of No. two Hall current sensor U2 and the identical of a Hall current sensor U1; The circuit connection structure of No. two switch method of remote signal circuit is identical with the circuit connection structure of a switch method of remote signal circuit; No. two Hall current sensor U2 are identical with the circuit connection structure of a switch method of remote signal circuit with a Hall current sensor U1 with the circuit connection structure of No. two switch method of remote signal circuit;
The output terminal of No. two switch method of remote signal circuit is connected with the output terminal of a switch method of remote signal circuit, output signal is all sampled by resistance R245, sampled signal is connected with described metering module by after the filter network filtering that is made up of resistance R217, resistance R218 and electric capacity C209, electric capacity C210, resistance R245 and resistance R218 link be connected in analog, electric capacity C209 and electric capacity C210 not with metering module link be connected in analog.
8. the wide magnitude electrical energy meter based on Hall element according to claim 1, is characterized in that, described voltage detection module adopts resistance pressure-dividing network to detect voltage, then signal is outputted to described metering module.
9. the wide magnitude electrical energy meter based on Hall element according to claim 1, is characterized in that, described power module adopts transformer, switching power source chip and linear low voltage difference voltage stabilizer to power to each module of electric energy meter respectively.
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| CN104977459A (en) * | 2015-07-15 | 2015-10-14 | 威胜集团有限公司 | Current detection device, electric energy meter made by device and metering method thereof |
| CN105699764A (en) * | 2016-03-21 | 2016-06-22 | 威胜集团有限公司 | Hall-sensor-based electric energy meter |
| CN108334206A (en) * | 2018-01-19 | 2018-07-27 | 深圳市亿道数码技术有限公司 | Two-in-one notebook use pattern switching system |
| CN111562435A (en) * | 2020-05-28 | 2020-08-21 | 南京国信能源有限公司 | Novel fill electric pile with direct current electric energy meter |
| CN111650434A (en) * | 2019-12-26 | 2020-09-11 | 北京博纳电气股份有限公司 | Method for single-phase intelligent electric energy meter to measure by adopting PCB type current sensor |
| CN111965420A (en) * | 2020-08-26 | 2020-11-20 | 威胜集团有限公司 | Random electric energy metering circuit, method and device |
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