CN102914691A - Device with adaptive function and method for detecting three-phase alternating current voltage and current - Google Patents
Device with adaptive function and method for detecting three-phase alternating current voltage and current Download PDFInfo
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- CN102914691A CN102914691A CN2012104008751A CN201210400875A CN102914691A CN 102914691 A CN102914691 A CN 102914691A CN 2012104008751 A CN2012104008751 A CN 2012104008751A CN 201210400875 A CN201210400875 A CN 201210400875A CN 102914691 A CN102914691 A CN 102914691A
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Abstract
The invention discloses a device with an adaptive function and a method for detecting three-phase alternating current voltage and current, relating to the technical field of power and electronics. The device comprises a three-phase alternating current voltage detection circuit, a voltage detection analogue switch circuit, a voltage detection amplification and filter circuit, a three-phase alternating current detection circuit, a current detection analogue switch circuit, a current detection amplification and filter circuit, an analog quantity acquiring circuit, a main control chip circuit, a voltage reference source circuit, a system reset circuit and a power supply management circuit. The invention also discloses a detecting method using the device. By the device and the method, self adaption of an amplification coefficient can be realized and measurement errors caused by errors of electronic components such as an amplification resistor can be avoided to ensure accurate detection results.
Description
Technical field
The present invention relates to electric power, electronic technology field, a kind of detection three-phase alternating voltage, current device and method with adaptation function particularly is provided, be applicable to high-power converter and three-phase alternating voltage, the current detecting relevant with electric power.
Technical background
Along with the development of the technology such as power electronics, intelligent grid, new forms of energy, the accuracy of the detection of three phase network voltage, electric current, real-time etc. are had higher requirement.
In field of power electronics, heavy-duty rectifier, high-power photovoltaic inverter etc. will be realized high performance control, better control the quality of power supply, the less harmonic current of output, at first will guarantee accuracy of detection, the accuracy of three-phase voltage, electric current.
Along with the development of intelligent grid and new energy technology, the technology such as the control of the quality of power supply of industrial electrical network, harmonic wave control, trend calculating become the focus of research, and the basis of all these technology is the accurate detections to electrical network three-phase voltage, electric current.Present measurement mechanism is for different measuring objects, and different voltage, range of current when adjusting the hardware amplification coefficient, also will be adjusted software, and software will be known accurately amplification coefficient, and the error of amplification coefficient directly causes measuring error.
Common problem for fields such as power electronics, intelligent grid, new forms of energy, three-phase alternating voltage, current sensing means with adaptation function have been designed, this device can be according to different voltage, range of current, the simple hardware system of adjusting, and need not revise software, utilize calibration steps, can realize the accurate measurement to voltage, electric current.
Summary of the invention
The object of the present invention is to provide a kind of detection three-phase alternating voltage, current device and method with adaptation function.Have advantages of that precision is high, can gather simultaneously three-phase alternating voltage, electric current, and have the functions such as automatic calibration.
The present invention includes: three-phase alternating voltage testing circuit 1, voltage detecting analog switching circuit 2, voltage detecting filtering and amplifying circuit 3, three-phase alternating current current detection circuit 4, current detecting analog switching circuit 5, current detecting filtering and amplifying circuit 6, analog quantity acquisition circuit 7, Master control chip circuit 8, voltage reference source circuit 9, system reset circuit 10, electric power management circuit 11.
Wherein three-phase alternating voltage testing circuit 1 links to each other with voltage detecting analog switch 2, voltage reference source circuit 9 links to each other with voltage detecting analog switch 2, and Master control chip circuit 8 is by sending control signal and select three-phase alternating voltage signal 1 or voltage reference source signal 9 outputing to voltage detecting filtering and amplifying circuit 3.Three-phase alternating current current detection circuit 4 links to each other with current detecting analog switch 5, voltage reference source circuit 9 links to each other with current detecting analog switch 5, and Master control chip circuit 8 is by sending control signal and select three-phase alternating current signal 4 or voltage reference source signal 9 outputing to current detecting filtering and amplifying circuit 6.Voltage detecting filtering and amplifying circuit 3 links to each other with analog quantity acquisition circuit 7 respectively with current detecting filtering and amplifying circuit 6, after three-phase alternating voltage, current signal amplification filtering, delivers to the AD acquisition chip.Analog quantity acquisition circuit 7 also links to each other with voltage reference source circuit 9, and voltage reference source circuit 9 provides voltage reference for analog acquisition circuit 7.Analog quantity acquisition circuit 7 links to each other with Master control chip circuit 8, and Master control chip reads the data that AD gathers by data bus simultaneously by the gatherer process of IO control simulation amount.System reset circuit 10 links to each other with Master control chip circuit 8, and system reset circuit 10 provides electrification reset and hand-reset for the Master control chip circuit.The power management chip circuit is powered simultaneously to three-phase alternating voltage testing circuit 1, voltage detecting analog switching circuit 2, voltage detecting filtering and amplifying circuit 3, three-phase alternating current current detection circuit 4, current detecting analog switching circuit 5, current detecting filtering and amplifying circuit 6, analog quantity acquisition circuit 7, Master control chip circuit 8, voltage reference source circuit 9, system reset circuit 10.
Described three-phase alternating voltage testing circuit 1 comprises A phase, B phase, C phase detecting circuit, and the three-phase detection circuit structure is identical, comprises 3 resistance and a voltage hall sensor as example mutually take A.By resistance alternating voltage is become current signal, receive voltage hall sensor, the voltage hall sensor output current signal becomes voltage signal by resistance.B phase, C phase detecting circuit are mutually identical with A, and the voltage hall sensor supply voltage is ± 15V.
Described voltage detecting analog switching circuit 2 is made of 1 analog switch chip 12, and analog switch chip comprises three passages, and alternative analog switch of each passage is selected by a control signal.Three passages connect respectively A phase, B phase, the C phase of three-phase voltage detection signal.Take A mutually as example, the first passage of analog switch, the 1st input end of the analog switch voltage signal that gets access to grid, the 2nd input of analog switch termination reference voltage, analog switch output connects filtering and amplifying circuit, switches by analog switch, measures respectively mains voltage signal and reference voltage signal.B phase, C phase are identical with the A facies principle, and the supply voltage of analog switch is ± 5V.
Described voltage detecting filtering and amplifying circuit 3 is comprised of A phase voltage filtering and amplifying circuit 13, B phase voltage filtering and amplifying circuit 14, C phase voltage filtering and amplifying circuit 15, and three voltage amplification filter circuit constructions are identical.Take A phase filtering and amplifying circuit 13 as example, by Differential input circuit, the forward amplifying circuit, second-order filter circuit forms.B phase, C circuitry phase structure are mutually identical with A.
Described three-phase alternating current current detection circuit 4 comprises A phase, B phase and C phase current testing circuit, and every phase current testing circuit is made of current Hall and peripheral circuit, and the three-phase circuit structure is identical.Mutually as example, comprise current Hall and sampling resistor take A, current Hall becomes weak current signal with the current conversion of electrical network, and the weak current signal of current Hall output becomes voltage signal through sampling resistor.B phase, C circuitry phase structure are mutually identical with A, current Hall sensor supply voltage ± 15V.
Described current detecting analog switching circuit 5 is made of analog switch chip 16.Analog switch chip 16 comprises three passages, and each passage has an alternative analog switching circuit.Three passages connect respectively A phase, B phase, the C phase of three-phase current detection signal.Take A mutually as example, the power network current signal connects the 1st input interface of analog switch first passage, and reference voltage connects the 2nd input interface of analog switch first passage, and analog switch output connects filtering and amplifying circuit, switch by analog switch, measure respectively power network current signal and reference voltage signal.B phase, C phase are identical with the A facies principle.
Described current detecting filtering and amplifying circuit 6 is detected filtering and amplifying circuit 19 and is formed by A phase current detection filtering and amplifying circuit 17, B phase current detection filtering and amplifying circuit 18, C phase current, and three circuit structures are identical.Take A phase filtering and amplifying circuit 17 as example, by Differential input circuit, the forward amplifying circuit, second-order filter circuit forms.B phase, C circuitry phase structure are mutually identical with A.
Described analog quantity acquisition circuit 7 is made of AD acquisition chip and peripheral resistance, electric capacity.The AD acquisition chip is by 8 input channels, can begin simultaneously to gather, and acquisition chip adopts outside high precision reference source, and the input range of analog quantity is at-10V ~ 10V, AD chip and Master control chip circuit 8 employing parallel interface reading out datas.
Described Master control chip circuit 8 is made of dsp chip, crystal oscillator, filter capacitor, pull-up resistor.Dsp chip control simulation switch, the AD acquisition chip, and read the AD image data by parallel interface.Crystal oscillator provides clock for DSP.
Described system reset circuit 10 is made of 1 reset chip, 5 resistance and 1 button, can make system reset by pressing button; The voltage of circuit falls also can make system reset.
Described voltage reference source circuit 9 is made of reference source chip, amplifier and resistance.Reference source chip output reference voltage 2.5V, 2 electric resistance partial pressure output voltage 1.25V, 1.25V voltage is by an amplifier output 1.25V reference voltage.
Described electric power management circuit 11 comprise 24V/ ± 15V circuit 20,24V/5V circuit 21 ,+15V/+5V circuit 22 ,-15V/- 5V circuit 23,5V/3.3 V circuit 24,5V/1.9V circuit 25.Wherein 24V/ ± 15V circuit 20 is comprised of 7 filter capacitors and a DC/DC power supply, gives the power supply of mimic channel and Hall element.24V/5V circuit 21 is comprised of 2 filter capacitors and a DC/DC power supply, powers to digital circuit.+ 15V/+5V circuit 22 is comprised of 2 filter capacitors and a power supply chip, gives analog switch chip, AD acquisition chip and reference source chip power supply.-15V/-5V circuit 23 is comprised of 2 filter capacitors and a power supply chip, powers to analog switch chip.5V/3.3V circuit 24 is comprised of 4 filter capacitors and a power supply chip, gives the master controller chip power supply.5V/1.9V circuit 25 is comprised of 4 filter capacitors, 2 resistance and a power supply chip, gives the master controller chip power supply.
Use the measuring method of described device to be:
(1) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected 2.5V reference source V
2.5V, by amplification filtering, by the AD Acquisition Circuit, DSP obtains digital quantity D
Uaref, D
Ubref, D
Ucref
(2) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected 1.25V reference source V
1.25V, gathering by AD, DSP obtains digital quantity D
Iaref, D
Ibref, D
Icref
(3) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected three-phase alternating voltage signal V
Ua, V
Ub, V
Uc, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ua, D
Ub, D
Uc
(4) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected three-phase alternating current signal V
Ia, V
Ib, V
Ic, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ia, D
Ib, D
Ic
(5) the AD Acquisition Circuit gathers the 0V voltage of the 7th analog channel, and DSP obtains digital quantity D
0V
(6) calibration steps of three-phase alternating voltage, three-phase alternating current is identical, and is identical with it by one road voltage signal explanation calibration steps, other 5 road signal.Take the 1 road voltage signal as example, through type (1)
V
Ua/V
2.5V = (D
Ua - D
0V)/( D
Uaref - D
0V) (1)
Through type (1) can draw formula (2)
V
Ua = (D
Ua - D
0V)/( D
Uaref - D
0V)* V
2.5V (2)
Through type (2) can directly obtain voltage V to be measured
Ua, V
Ub, V
Uc, V
Ia, V
Ib, V
IcComputation process is identical therewith.
(7) pass through V
Ua, V
Ub, V
UcCan directly obtain three-phase alternating voltage with the no-load voltage ratio relation of voltage Hall original edge voltage.Pass through V
Ia, V
Ib, V
IcCan directly obtain three-phase alternating current with the no-load voltage ratio relation of current Hall primary current.
Do not consider the problems such as amplification coefficient of amplifier in the computation process, so the method can realize the self-adaptation of amplification coefficient, can avoid the measuring error brought because of the error of amplifying the electrical equipments such as resistance, because the voltage accuracy of reference source is very high, so can make measurement result accurate, and can be to circuit amplification coefficient self-adaptation, the according to actual needs amplification coefficient of Circuit tuning.
Description of drawings
Fig. 1 is integrated circuit structural drawing of the present invention.Wherein, three-phase alternating voltage testing circuit 1, voltage detecting analog switching circuit 2, voltage detecting filtering and amplifying circuit 3, three-phase alternating current current detection circuit 4, current detecting analog switching circuit 5, current detecting filtering and amplifying circuit 6, analog quantity acquisition circuit 7, Master control chip circuit 8, voltage reference source circuit 9, system reset circuit 10, electric power management circuit 11.
Fig. 2 is three-phase alternating voltage metering circuit of the present invention.
Fig. 3 is three-phase voltage analog switch of the present invention, filtering and amplifying circuit.Wherein, analog switch chip 12, A phase voltage filtering and amplifying circuit 13, B phase voltage filtering and amplifying circuit 14, C phase voltage filtering and amplifying circuit 15.
Fig. 4 is three-phase current detection of the present invention, analog switch, filtering and amplifying circuit.Analog switch chip 16, A phase current detect filtering and amplifying circuit 17, the B phase current detects filtering and amplifying circuit 18, C phase current detection filtering and amplifying circuit 19.
Fig. 5 is analog quantity acquisition circuit of the present invention.
Fig. 6 is master controller chip circuit of the present invention.
Fig. 7 is system reset circuit of the present invention.
Fig. 8 is voltage reference source circuit of the present invention.
Fig. 9 is electric power management circuit of the present invention.Wherein, 24V/ ± 15V circuit 20,24V/5V circuit 21 ,+15V/+5V circuit 22 ,-15V/- 5V circuit 23,5V/3.3 V circuit 24,5V/1.9V circuit 25.
Embodiment
In order more specifically to describe the present invention, below in conjunction with drawings and Examples technical scheme of the present invention and relative theory thereof are elaborated.The below only is in order to provide the present invention clearly to be explained by example of the present invention being shown to the description of embodiment.Any concrete configuration that the invention is not restricted to propose below, but under the prerequisite that does not break away from spirit of the present invention, covered any modification, replacement, the improvement of related elements.
As shown in Figure 1, the present invention includes three-phase alternating voltage testing circuit 1, voltage detecting analog switching circuit 2, voltage detecting filtering and amplifying circuit 3, three-phase alternating current current detection circuit 4, current detecting analog switching circuit 5, current detecting filtering and amplifying circuit 6, analog quantity acquisition circuit 7, Master control chip circuit 8, voltage reference source circuit 9, system reset circuit 10, electric power management circuit 11.
Wherein three-phase alternating voltage testing circuit 1 links to each other with voltage detecting analog switch 2, voltage reference source circuit 9 links to each other with voltage detecting analog switch 2, and master controller 8 is by sending control signal and select three-phase alternating voltage signal 1 or voltage reference source signal 9 outputing to voltage detecting filtering and amplifying circuit 3.Three-phase alternating current current detection circuit 4 links to each other with current detecting analog switch 5, voltage reference source circuit 9 links to each other with current detecting analog switch 5, and master controller 8 is by sending control signal and select three-phase alternating current signal 4 or voltage reference source signal 9 outputing to current detecting filtering and amplifying circuit 6.Voltage detecting filtering and amplifying circuit 3 links to each other respectively at analog quantity acquisition circuit 7 with current detecting filtering and amplifying circuit 6, after three-phase alternating voltage, current signal amplification filtering, delivers to the AD acquisition chip.Analog quantity acquisition circuit 7 also links to each other with voltage reference source circuit 9, and voltage reference source circuit 9 provides voltage reference for analog acquisition circuit 7.Analog quantity acquisition circuit 7 links to each other with Master control chip circuit 8, and Master control chip reads the data that AD gathers by data bus simultaneously by the gatherer process of IO control simulation amount.System reset circuit 10 links to each other with Master control chip circuit 8, and system reset circuit 10 provides electrification reset and hand-reset for the Master control chip circuit.The power management chip circuit is powered simultaneously to three-phase alternating voltage testing circuit 1, voltage detecting analog switching circuit 2, voltage detecting filtering and amplifying circuit 3, three-phase alternating current current detection circuit 4, current detecting analog switching circuit 5, current detecting filtering and amplifying circuit 6, analog quantity acquisition circuit 7, Master control chip circuit 8, voltage reference source circuit 9, system reset circuit 10.
As shown in Figure 2, described three-phase alternating voltage testing circuit 1, comprise A phase, B phase, C phase detecting circuit, the three-phase detection circuit structure is identical, comprise R6, R7, U7, R12 as example mutually take A, R6, R7 become alternating voltage into current signal, receive voltage hall sensor U7, and the U7 output current signal becomes voltage signal V by R12
UaThe B phase detecting circuit comprises R16, R17, U8, R18.The C phase detecting circuit comprises R21, R22, U9, R23.Voltage hall sensor supply voltage+15V and-15V.
As shown in Figure 3, described voltage detecting analog switching circuit 2 is made of analog switch 12, and analog switch 12 comprises three passages, and alternative analog switch of each passage is selected by a control signal.Three passages connect respectively A phase, B phase, the C phase of three-phase voltage detection signal.Take A mutually as example, U1A is the first passage of analog switch, voltage signal VUa is surveyed in the input X0 reception of analog switch, analog switch X1 meets reference voltage 2.5V, analog switch output X connects filtering and amplifying circuit, voltage VUa or reference voltage 2.5V are surveyed in analog switch output X reception, and by control signal signal SUa control, SUa is by main controller controls.B phase, C phase are identical with the A facies principle.The supply voltage of analog switch is ± 5V.
Described voltage detecting filtering and amplifying circuit 3 is comprised of A phase voltage filtering and amplifying circuit 13, B phase voltage filtering and amplifying circuit 14, C phase voltage filtering and amplifying circuit 15, and three circuit structures are identical.Take A phase filtering and amplifying circuit 13 as example, consisted of by U3, U5A, U6A, R1, R3, R8, R9, R14, R19, C1, C3, U3 consists of the difference input amplifying circuit, and U6A, R3, R14, R19 consist of the forward amplifying circuit, and input voltage signal is amplified.U5A, R1, R8, R9, C1, C3 consist of the second-order low-pass filter circuit, and the noise in the passage is carried out filtering.B phase filtering and amplifying circuit 14 is made of U10, U11A, U11B, R20, R25, R26, R27, R32, R33, C5, C7.C phase filtering and amplifying circuit 15 is made of U14, U15A, U15B, R36, R37, R39, R40, R42, R46, C9, C10.Voltage detecting filtering and amplifying circuit 3 passes through electric power management circuit ± 15V power supply.
As shown in Figure 4, described three-phase alternating current current detection circuit 4 comprises that A phase, B phase, C phase current detect, and is made of current Hall and peripheral circuit, and the three-phase circuit structure is identical.Mutually as example, comprise current Hall TA1 and resistance R 5 take A, current Hall becomes the weak current signal to the large current conversion of electrical network, and the weak current signal of current Hall output becomes voltage signal through resistance R 5.B phase current testing circuit comprises TA2 and resistance R 29, and C phase current testing circuit comprises TA3 and resistance R 43.Current Hall sensor supply voltage ± 15V.
Described current detecting analog switching circuit 5 is made of analog switch 16, and analog switch 16 comprises three passages, and alternative analog switch of each passage is selected by a control signal.Three passages connect respectively A phase, B phase, the C phase of three-phase current detection signal.Mutually as example, U1A is the first passage of analog switch take A, and the input X0 of analog switch meets voltage signal VIa, and analog switch X1 meets reference voltage 1.25V, and analog switch input X connects filtering and amplifying circuit, and X output VUa or reference voltage 2.5V are controlled by signal SIa.B phase, C phase are identical with the A facies principle.The supply voltage of analog switch is ± 5V.
Described current detecting filtering and amplifying circuit 6 is detected filtering and amplifying circuit 19 and is formed by A phase current detection filtering and amplifying circuit 17, B phase current detection filtering and amplifying circuit 18, C phase current, and three circuit structures are identical.Take A phase filtering and amplifying circuit 17 as example, consisted of by U4, U5B, U6B, R2, R4, R10, R11, R13, R15, C2, C4, U4 consists of the difference input amplifying circuit, U6B, R4, R13, R15 consist of the forward amplifying circuit, and U6A, R2, R10, R11, C2, C4 consist of the second-order low-pass filter circuit.The B phase current detects filtering and amplifying circuit 18, is made of U12, U13A, U13B, R24, R28, R30, R31, R34, R35, C6, C8.The C phase current detects filtering and amplifying circuit 19, is made of U16, U17A, U17B, R38, R41, R44, R45, R47, R48, C11, C12.Current detecting filtering and amplifying circuit 6 passes through electric power management circuit ± 15V power supply.
As shown in Figure 5, described analog quantity acquisition circuit 7 is made of AD acquisition chip U22 and peripheral resistance, electric capacity.The AD acquisition chip meets respectively Ua, Ub, Uc, Ia, Ib, Ic, 2.5V and 0V by 8 input channels.Acquisition chip adopts outside high precision reference source+2.5V, resistance R 60 ground connection.R59 meets 3.3V, and the analog input scope that makes 8 passages is at-10V ~ 10V.R61, R62, R63 set and do not carry out over-sampling.R64, R65 ground connection arrange AD chip and master controller chip and adopt the parallel interface reading out data.C13, C14, C15, C18 play filter action.Signal ADCONST is provided by master controller, the beginning that control AD gathers, 8 passage synchronization samplings.AD gathers to finish by ADBUSY and provides signal, and the notification controller collection is finished.Master controller is read the image data of 8 passages successively by parallel data bus line DATA0 ~ DATA15, what signal ADFRSTDATA standard was read is the measurement data of first passage.AD acquisition chip analog quantity partly adopts+the 5V power supply, and the digital quantity 3.3V power supply of partly sampling.
As shown in Figure 6, described Master control chip circuit 8 is made of dsp chip TMS320F28335, crystal oscillator, filter capacitor, pull-up resistor.Dsp chip control simulation switching over voltage to be measured and reference voltage.DSP control AD gathers beginning, and reads the AD image data by parallel interface.Crystal oscillator is the DSP clock, and crystal oscillator is made of 30MHz crystal, R68, C30, C31.Pull-up resistor R66, R67, R69, R70, R71 make DSP be operated in effective status.Capacitor C 40 ~ C61 carries out filtering to power supply, and DSP adopts 3.3V and 1.9V power supply.
As shown in Figure 7, described system reset circuit 10, reset chip U21 is according to power supply 1.9V, 3.3V the level of 5V provides reset function, if three supply voltages reduce below the voltage that requires, then U21 sends reset signal, the DSP that resets, simultaneously electrification reset function.Reset button SW1 provides the hand-reset function, presses the button dsp chip that can reset.Reset circuit 10 is made of U21, R52, R53, R54, R55, R56 and SW1.
As shown in Figure 8, described voltage reference source circuit 9, reference source chip input+5V, output high-accuracy voltage+2.5V is for voltage measurement analog switch and AD acquisition chip provide reference voltage.2.5V voltage obtains 1.25V voltage by R49, R50 dividing potential drop.1.25V the voltage follower that voltage R51, U19A form, output 1.25V reference voltage.
As shown in Figure 9, described electric power management circuit 11 comprise 24V/ ± 15V circuit 20,24V/5V circuit 21 ,+15V/+5V circuit 22 ,-15V/- 5V circuit 23,5V/3.3 V circuit 24,5V/1.9V circuit 25.
Described 24V/ ± 15V circuit 20, power supply P1 transforms to voltage ± 15V by 24V.C25, C26 input energy storage to 24V, and C23 is to 24V filtering.C19, C22 are to output+15V filtering, and C27, C29 are to output-15V filtering.± 15 give mimic channel and Hall element power supply.
Described 24V/5V circuit 21, power supply P2 transforms to voltage+5V by 24V, and C33, C34 strobe.+ 5V is to electric power management circuit 5V/3.3 V circuit 24 and 25 power supplies of 5V/1.9V circuit.
Described+15V/+5V circuit 22, power supply chip U23 transforms to voltage+5V by+15V, and C20, C21 be right+15V filtering.+ 15V is to analog switch chip, AD acquisition chip and reference source chip power supply.
Described-15V/-5V circuit 23, power supply chip U24 transforms to voltage-5V by-15V, and C24, C28 be right+15V filtering ,-5V powers to analog switch chip.
Described 5V/3.3V circuit 24, power supply chip U25 transforms to 3.3V with voltage by+5V, and C36, C37 are to 5V filtering, and C35, C38 are to 3.3V filtering, and 3.3V is to the master controller chip power supply.
Described 5V/1.9V circuit 25 power supply chip U26, resistance R 72, resistance R 73 transform to 1.9V with voltage by+5V, and C39, C62 are to 5V filtering, and C63, C64 are to 1.9V filtering, and 1.9V is to the master controller chip power supply.
This device can be calibrated three-phase alternating voltage, the three-phase alternating current measured automatically, and the step that this device automatic calibration is implemented is as follows:
(1) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected 2.5V reference source V
2.5V, by amplification filtering, by the AD Acquisition Circuit, DSP obtains digital quantity D
Uaref, D
Ubref, D
Ucref
(2) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected 1.25V reference source V
1.25V, gathering by AD, DSP obtains digital quantity D
Iaref, D
Ibref, D
Icref
(3) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected three-phase alternating voltage signal V
Ua, V
Ub, V
Uc, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ua, D
Ub, D
Uc
(4) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected three-phase alternating current signal V
Ia, V
Ib, V
Ic, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ia, D
Ib, D
Ic
(5) the AD Acquisition Circuit gathers the 0V voltage of the 7th analog channel, and DSP obtains digital quantity D
0V
(6) calibration steps of three-phase alternating voltage, three-phase alternating current is identical, and is identical with it by one road voltage signal explanation calibration steps, other 5 road signal.Take the 1 road voltage signal as example, through type (1)
V
Ua/V
2.5V = (D
Ua - D
0V)/( D
Uaref - D
0V) (1)
Through type (1) can draw formula (2)
V
Ua = (D
Ua - D
0V)/( D
Uaref - D
0V)* V
2.5V (2)
Through type (2) can directly obtain voltage V to be measured
Ua, V
Ub, V
Uc, V
Ia, V
Ib, V
IcComputation process is identical therewith.
(7) pass through V
Ua, V
Ub, V
UcCan directly obtain three-phase alternating voltage with the no-load voltage ratio relation of voltage Hall original edge voltage.Pass through V
Ia, V
Ib, V
IcCan directly obtain three-phase alternating current with the no-load voltage ratio relation of current Hall primary current.
Claims (13)
1. one kind has the detection three-phase alternating voltage of adaptation function, the device of alternating current, it is characterized in that, comprising: three-phase alternating voltage testing circuit (1), voltage detecting analog switching circuit (2), voltage detecting filtering and amplifying circuit (3), three-phase alternating current current detection circuit (4), current detecting analog switching circuit (5), current detecting filtering and amplifying circuit (6), analog quantity acquisition circuit (7), Master control chip circuit (8), voltage reference source circuit (9), system reset circuit (10), electric power management circuit (11); Wherein three-phase alternating voltage testing circuit (1) links to each other with voltage detecting analog switch (2), and voltage detecting analog switch (2) links to each other with voltage detecting filtering and amplifying circuit (3), and voltage reference source circuit (9) links to each other with voltage detecting analog switch (2); Three-phase alternating current current detection circuit (4) links to each other with current detecting analog switch (5), and current detecting analog switch (5) links to each other with current detecting filtering and amplifying circuit (6), and voltage reference source circuit (9) links to each other with current detecting analog switch (5); Voltage detecting filtering and amplifying circuit (3) links to each other respectively at analog quantity acquisition circuit (7) with current detecting filtering and amplifying circuit (6); Analog quantity acquisition circuit (7) also links to each other with voltage reference source circuit 9, and analog quantity acquisition circuit 7 links to each other with Master control chip circuit 8.System reset circuit (10) links to each other with Master control chip circuit (8); Power management chip circuit (11) links to each other with three-phase alternating voltage testing circuit (1), voltage detecting analog switching circuit (2), voltage detecting filtering and amplifying circuit (3), three-phase alternating current current detection circuit (4), current detecting analog switching circuit (5), current detecting filtering and amplifying circuit (6), analog quantity acquisition circuit (7), Master control chip circuit (8), voltage reference source circuit (9), system reset circuit (10).
2. the device of detection three-phase alternating voltage according to claim 1, alternating current, it is characterized in that, wherein said three-phase alternating voltage testing circuit (1), comprise A phase, B phase, C phase detecting circuit, the three-phase detection circuit structure is identical, includes 3 resistance and a voltage hall sensor; By resistance alternating voltage is become current signal, receive voltage hall sensor, the voltage hall sensor output current signal becomes voltage signal by resistance, and the voltage hall sensor supply voltage is ± 15V.
3. the device of detection three-phase alternating voltage according to claim 1, alternating current, it is characterized in that, described voltage detecting analog switching circuit (2), consisted of by 1 analog switch chip, analog switch chip comprises three passages, alternative analog switch of each passage is selected by a control signal; Three passages connect respectively A phase, B phase, the C phase of three-phase voltage detection signal; The first passage of analog switch, the 1st input end of the analog switch voltage signal that gets access to grid, the 2nd input of analog switch termination reference voltage, analog switch output connects filtering and amplifying circuit, switch by analog switch, measure respectively mains voltage signal and reference voltage signal; The supply voltage of analog switch is ± 5V.
4. device according to claim 1, it is characterized in that, described voltage detecting filtering and amplifying circuit (3), be comprised of A phase voltage filtering and amplifying circuit (13), B phase voltage filtering and amplifying circuit (14), C phase voltage filtering and amplifying circuit (15), three voltage amplification filter circuit constructions are identical; By Differential input circuit, the forward amplifying circuit, second-order filter circuit forms.
5. the device of detection three-phase alternating voltage according to claim 1, alternating current, it is characterized in that, described three-phase alternating current current detection circuit (4) comprises that A phase, B phase, C phase current detect, and every phase current testing circuit consists of by current Hall and peripheral circuit.Mutually as example, comprise current Hall and sampling resistor take A.
6. the device of detection three-phase alternating voltage according to claim 1, alternating current is characterized in that, described current detecting analog switching circuit (5) is made of analog switch chip (16).Analog switch chip (16) comprises three passages, and each passage has an alternative analog switching circuit; Three passages connect respectively A phase, B phase, the C phase of three-phase current detection signal; The power network current signal connects the 1st input interface of analog switch first passage, reference voltage connects the 2nd input interface of analog switch first passage, analog switch output connects filtering and amplifying circuit, switches by analog switch, measures respectively power network current signal and reference voltage signal.
7. device according to claim 1, it is characterized in that, described current detecting filtering and amplifying circuit (6), detected filtering and amplifying circuit (19) and formed by A phase current detection filtering and amplifying circuit (17), B phase current detection filtering and amplifying circuit (18), C phase current, three current detecting filtering and amplifying circuit structures are identical; By Differential input circuit, the forward amplifying circuit, second-order filter circuit forms.
8. the device of detection three-phase alternating voltage according to claim 1, alternating current is characterized in that, described analog quantity acquisition circuit (7) is made of AD acquisition chip and peripheral resistance, electric capacity; The AD acquisition chip is by 8 input channels, can begin simultaneously to gather, and acquisition chip adopts outside high precision reference source, and the input range of analog quantity is at-10V～10V.
9. the device of detection three-phase alternating voltage according to claim 1, alternating current is characterized in that, described Master control chip circuit (8) is made of dsp chip, crystal oscillator, filter capacitor, pull-up resistor.
10. the device of detection three-phase alternating voltage according to claim 1, alternating current is characterized in that, described system reset circuit (10) is made of 1 reset chip, 5 resistance and 1 button.
11. the device of detection three-phase alternating voltage according to claim 1, alternating current is characterized in that, described voltage reference source circuit (9) is made of reference source chip, amplifier and resistance; Reference source chip output reference voltage 2.5V, 2 electric resistance partial pressure output voltage 1.25V, 1.25V voltage is by an amplifier output 1.25V reference voltage.
12. the device of detection three-phase alternating voltage according to claim 1, alternating current, it is characterized in that, described electric power management circuit (11) comprise 24V/ ± 15V circuit (20), 24V/5V circuit (21) ,+15V/+5V circuit (22) ,-15V/-5V circuit (23), 5V/3.3V circuit (24), 5V/1.9V circuit (25); Wherein 24V/ ± 15V circuit (20) is comprised of 7 filter capacitors and a DC/DC power supply, gives the power supply of mimic channel and Hall element; 24V/5V circuit (21) is comprised of 2 filter capacitors and a DC/DC power supply, powers to digital circuit; + 15V/+5V circuit (22) is comprised of 2 filter capacitors and a power supply chip, gives analog switch chip, AD acquisition chip and reference source chip power supply;-15V/-5V circuit (23) is comprised of 2 filter capacitors and a power supply chip, powers to analog switch chip; 5V/3.3V circuit (24) is comprised of 4 filter capacitors and a power supply chip, gives the master controller chip power supply; 5V/1.9V circuit (25) is comprised of 4 filter capacitors, 2 resistance and a power supply chip, gives the master controller chip power supply.
13. one kind has the detection three-phase alternating voltage of adaptation function, the method for alternating current, it is characterized in that, detecting step is:
(1) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected 2.5V reference source V
2.5V, by amplification filtering, by the AD Acquisition Circuit, DSP obtains digital quantity D
Uaref, D
Ubref, D
Ucref
(2) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected 1.25V reference source V
1.25V, gathering by AD, DSP obtains digital quantity D
Iaref, D
Ibref, D
Icref
(3) analog switch sends control signal by master controller, and the analog switch of tension measuring circuit is connected three-phase alternating voltage signal V
Ua, V
Ub, V
Uc, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ua, D
Ub, D
Uc
(4) analog switch sends control signal by master controller, and the analog switch of current measurement circuit is connected three-phase alternating current signal V
Ia, V
Ib, V
Ic, by amplification filtering, AD Acquisition Circuit, DSP obtains digital quantity D
Ia, D
Ib, D
Ic
(5) the AD Acquisition Circuit gathers the 0V voltage of the 7th analog channel, and DSP obtains digital quantity D
0V
(6) calibration of three-phase alternating voltage, three-phase alternating current:
Through type: V
Ua/ V
2.5V=(D
Ua-D
0V)/(D
Uaref-D
0V) (1)
Through type (1) draws formula (2)
V
Ua = (D
Ua - D
0V)/( D
Uaref - D
0V)* V
2.5V (2)
Through type (2) directly obtains voltage V to be measured
Ua, V
Ub, V
Uc, V
Ia, V
Ib, V
IcComputation process is identical therewith;
(7) pass through V
Ua, V
Ub, V
UcCan directly obtain three-phase alternating voltage with the no-load voltage ratio relation of voltage Hall original edge voltage.Pass through V
Ia, V
Ib, V
IcCan directly obtain three-phase alternating current with the no-load voltage ratio relation of current Hall primary current.
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| CN201210400875.1A CN102914691B (en) | 2012-10-19 | 2012-10-19 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
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| CN103543319A (en) * | 2013-09-06 | 2014-01-29 | 国家电网公司 | High-precision fast measuring circuit and method for wide-range currents in power system |
| CN103698590A (en) * | 2013-12-02 | 2014-04-02 | 国家电网公司 | Real-time voltage monitor device of 10KV power distribution network |
| CN104897946A (en) * | 2014-03-07 | 2015-09-09 | 珠海格力电器股份有限公司 | Current detection device and system |
| CN104965116A (en) * | 2015-06-29 | 2015-10-07 | 昆明电器科学研究所 | Instrument electric quantity signal collection circuit board |
| WO2017107645A1 (en) * | 2015-12-25 | 2017-06-29 | 北京新能源汽车股份有限公司 | Phase current signal sampling method and apparatus, electric motor controller and electric vehicle |
| CN107340420A (en) * | 2017-07-19 | 2017-11-10 | 广东美的暖通设备有限公司 | Detecting voltage by three phase circuit and air conditioner |
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