CN108351375A - A kind of detection method and device of three-phase phase sequence - Google Patents
A kind of detection method and device of three-phase phase sequence Download PDFInfo
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- CN108351375A CN108351375A CN201780003766.7A CN201780003766A CN108351375A CN 108351375 A CN108351375 A CN 108351375A CN 201780003766 A CN201780003766 A CN 201780003766A CN 108351375 A CN108351375 A CN 108351375A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A kind of device of the detection method of three-phase phase sequence.A kind of detection method of three-phase phase sequence, including：Signal comparator circuit (210) obtains the three phase sine input signal (S101) of three phase mains input；The three phase sine input signal is generated three square-wave signals (S102) by the signal comparator circuit (210)；The signal comparator circuit (210) exports three square-wave signals to dsp chip (220) (S103)；The dsp chip (220) obtains the pulse signal (S104) of three square-wave signals respectively；The dsp chip (220) determines the phase sequence (S105) of the three phase sine input signal according to the sequencing for the pulse signal for getting three square-wave signals.It can be accurately judged to the phase sequence of three-phase electricity, it is convenient and simple.
Description
Technical field
The present invention relates to three-phase electrical domain more particularly to a kind of detection method and device of three-phase phase sequence.
Background technology
Three-phase alternating current is a kind of transporting pattern of electric energy, and abbreviation three-phase electricity, three-phase electricity is by differing 120 ° on spatial position
Three coils at angle are rotated with identical speed to be generated, by the sinusoidal wave component of three 120 ° of differences in phase.The use of three-phase electricity
There are many way, and most AC electric equipment is all powered using three-phase electricity in industry.Using the equipment of three-phase electricity to phase sequence
It all requires, must correctly be accessed according to phase sequence when accessing three-phase electricity can just be such that three-phase electric equipment works normally.
In the prior art, the equipment that phase sequence requires relies primarily on phase-sequence detector to sentence to the phase sequence of three-phase electricity
It is disconnected, just allow running equipment after ensureing correctly, repeatedly access is needed just to can determine that correct phase sequence in some cases, it is number
It is tired.
Invention content
The present invention provides a kind of detection method and device of three-phase phase sequence, can be accurately judged to the phase sequence of three-phase electricity,
It is convenient and simple.
First aspect of the embodiment of the present invention provides a kind of detection method of three-phase phase sequence, the method includes：
Signal comparator circuit obtains the three phase sine input signal of three phase mains input；
The three phase sine input signal is generated three square-wave signals by the signal comparator circuit；
The signal comparator circuit exports three square-wave signals to dsp chip；
The dsp chip obtains the pulse signal of three square-wave signals respectively；
The dsp chip determines the three-phase according to the sequencing for the pulse signal for getting three square-wave signals
The phase sequence of sinusoidal input signal.
In a kind of possible design, the dsp chip is according to the pulse signal for getting three square-wave signals
Sequencing determines that the phase sequence of the three phase sine input signal includes：Three square waves that the dsp chip will be got
The corresponding sinusoidal input signal of pulse signal of first arrival is determined as A phase sinusoidal input signals in the pulse signal of signal；
The dsp chip is corresponding just by the pulse signal of second arrival in the pulse signal of three square-wave signals got
String input signal is determined as B phase sinusoidal input signals；The dsp chip believes the pulse of three square-wave signals got
The corresponding sinusoidal input signal of pulse signal that third arrives in number is determined as C phase sinusoidal input signals.
Second aspect of the embodiment of the present invention provides a kind of detection device of three-phase phase sequence, and described device includes that signal compares
Circuit, dsp chip, wherein：
The signal comparator circuit is connect with three phase mains, the three phase sine input for obtaining the three phase mains input
The three phase sine input signal is generated three square-wave signals and exports three square-wave signals to the DSP by signal
Chip；
The dsp chip is connect with the signal comparator circuit, the pulse for obtaining three square-wave signals respectively
Signal simultaneously determines the three phase sine input signal according to the sequencing for the pulse signal for getting three square-wave signals
Phase sequence.
In a kind of possible design, the signal comparator circuit includes operational amplification circuit, comparison circuit, wherein：Institute
It states operational amplification circuit to connect with the first power supply of the three phase mains, output preset voltage value respectively, for obtaining described three
The three phase sine input signal of phase power input, the three phase sine input signal that the three phase mains is inputted with preset voltage value
Boosting biasing is carried out, and the three phase sine input signal after boosting biases is exported to the comparison circuit；The comparison
Circuit is connect with the operational amplification circuit, the dsp chip respectively, for inputting the three phase sine after boosting biases
Signal generates three square-wave signals and exports three square-wave signals to the dsp chip.
In a kind of possible design, the operational amplification circuit includes three operational amplifiers, wherein：Three fortune
It calculates amplifier to connect with the three phase mains, the comparison circuit respectively, three for obtaining the three phase mains input respectively
Three sinusoidal input signals of phase sinusoidal input signal respectively rise three sinusoidal input signals with preset voltage value
Pressure biasing, and exported three sinusoidal input signals after boosting biasing are carried out respectively to the comparison circuit.
In a kind of possible design, the comparison circuit includes three comparators, wherein：Three comparators difference
It is connect with the operational amplification circuit, the dsp chip, for respectively by the three phase sine input signal after boosting biases
Three sinusoidal input signals generate three square-wave signals respectively and export three square-wave signals to the dsp chip.
In a kind of possible design, the signal comparator circuit further includes voltage follower circuit, wherein：The operation is put
Big circuit is connect by the voltage follower circuit with the comparison circuit.
In a kind of possible design, the signal comparator circuit further includes bleeder circuit, wherein：The three phase mains is logical
The bleeder circuit is crossed to connect with the operational amplification circuit；The three-phase that the bleeder circuit is used to input the three phase mains
Sinusoidal input signal reduced output voltage is to the operational amplification circuit.
In a kind of possible design, the dsp chip includes three I/O mouthfuls, wherein：The signal comparator circuit difference
It is connect with described three I/O mouthfuls；The signal comparator circuit is defeated by three square-wave signals respectively by described three I/O mouthfuls
Enter to dsp chip.
In a kind of possible design, the dsp chip is specifically used for：By the arteries and veins of three square-wave signals got
The corresponding sinusoidal input signal of pulse signal for rushing first arrival in signal is determined as A phase sinusoidal input signals；It will get
Three square-wave signals pulse signal in second arrival the corresponding sinusoidal input signal of pulse signal be determined as B phases
Sinusoidal input signal；The pulse signal that third in the pulse signal of three square-wave signals got is arrived is corresponding
Sinusoidal input signal is determined as C phase sinusoidal input signals.
The embodiment of the present invention is converted into three square-wave signals by the three phase sine input signal for inputting three phase mains, obtains
Take the pulse signal of three square-wave signals and according to the sequencing for the pulse signal for getting three square-wave signals
The phase sequence for determining the three phase sine input signal solves the equipment for having phase sequence to require in conventional method and relies primarily on phase sequence inspection
Device is surveyed to judge the phase sequence of three-phase electricity, just allows running equipment after ensureing correctly, needs repeatedly to connect in some cases
The problem of entering just to can determine that correct phase sequence.Compared with conventional method, method provided in an embodiment of the present invention more accurately facilitates.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of detection method of three-phase phase sequence in the embodiment of the present invention；
Fig. 2 is front and back comparison diagram of the three phase sine input signal in the embodiment of the present invention by signal comparator circuit；
Fig. 3 is a kind of composed structure schematic diagram of the detection device of three-phase phase sequence in the embodiment of the present invention；
Fig. 4 is the composed structure signal of the signal comparator circuit of the detection device of the three-phase phase sequence of the embodiment of the present invention
Figure；
Fig. 5 is the schematic diagram of LM2902 operation amplifier chips；
Fig. 6 is the circuit connection diagram that operational amplification circuit is constituted using operation amplifier chip of the embodiment of the present invention；
Fig. 7 is the schematic diagram of LM2901 comparable chips；
Fig. 8 is the circuit connection diagram that comparison circuit is constituted using comparable chip of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
It is a kind of detection method of three-phase phase sequence in the embodiment of the present invention, institute as shown in the figure referring initially to Fig. 1, Fig. 1
The method of stating includes at least：
Step S101：Signal comparator circuit obtains the three phase sine input signal of three phase mains input.
Wherein, the three phase sine input signal includes the sinusoidal input signal that three phase differences are 120 °.
Optionally, a switching circuit can be set between the signal comparator circuit and the three phase mains, and made
The switching circuit is always maintained at off-state, when needing to obtain the three phase sine input signal of the three phase mains input
The switching circuit is opened, can guarantee that three sines of the three phase sine input signal are defeated in such a way that switching circuit is set
Entering signal can be simultaneously emitted by.
Optionally, the when of obtaining the three phase sine input signal of the three phase mains input can needed just to open described three
Phase power supply.
Step S102：The three phase sine input signal is generated three square-wave signals by the signal comparator circuit.
Optionally, the signal comparator circuit can be respectively to three sinusoidal input letters of the three phase sine input signal
It number is handled respectively, generates three square-wave signals.
Optionally, the signal comparator circuit may be used comparator and carry out processing life to the three phase sine input signal
At three square-wave signals.
In the concrete realization, the signal comparator circuit may include 3 comparators, and 3 comparators are respectively to described three
A sinusoidal input signal is handled, and then generates 3 square-wave signals respectively；The signal comparator circuit can also only include 1
The phase difference of a comparator, three sinusoidal input signals is 120 °, is arrived in different moments, then 1 comparator can
To handle successively three sinusoidal input signals, and it is sequentially output 3 square-wave signals；Wherein, the processing of comparator
Mechanism can be as follows：When comparator detects that the voltage of sinusoidal input signal is higher than predetermined threshold value, then high level signal is exported；
When comparator detects that the voltage of sinusoidal input signal is less than predetermined threshold value, then low level signal is exported.
Specifically, as illustrated in fig. 2, it is assumed that three sinusoidal input signals of three phase sine input signal are passing through the signal
Before comparison circuit as figure A shown in, three phase sine input signal include sinusoidal input signal a, b, c, sinusoidal input signal a, b, c it
Between phase difference be 120 °, then the circuit after the signal comparator circuit as shown in panelb, sinusoidal input signal a, b, c points
It is not converted into square-wave signal a1, b1, c1.
Optionally, the signal comparator circuit may include operational amplifier, wherein operational amplifier is used for described three
Phase sinusoidal input signal carries out boosting biasing, i.e., the electricity of certain predetermined threshold value is added to the voltage of the three phase sine input signal
Pressure.
Specifically, for example by the three phase sine applied signal voltage ranging from [- 1.5V, 1.5V] before boosting biasing, then
The voltage range of three phase sine input signal after boosting biases is [0,3V], i.e., operational amplifier makes three phase sine input
The voltage of signal raises 1.5V.
Optionally, the signal comparator circuit may include bleeder circuit, wherein bleeder circuit is used for defeated to three phase mains
The three phase sine input signal entered carries out reduced output voltage.
Specifically, for example three phase mains exports 220V, then multiple divider resistances can be set so that through excessive in bleeder circuit
The voltage of three phase sine input signal after volt circuit can drop to a smaller numerical value, to avoid high voltage in circuit
Component damages.
Step S103：The signal comparator circuit exports three square-wave signals to dsp chip.
Optionally, the signal comparator circuit can respectively export the square-wave signal to the DSP (Digital
Signal Processing, Digital Signal Processing) chip I/O (Input/Output, input/output) mouth.
Step S104：The dsp chip obtains the pulse signal of three square-wave signals respectively.
Optionally, the pulse signal can be the decline of the rising edge signal or the square-wave signal of the square-wave signal
Along signal, it should be noted that the dsp chip obtained is the identical pulse signal of attribute, such as obtains described three respectively
The rising edge signal of a square-wave signal or the failing edge signal for obtaining the square-wave signal respectively.
Step S105：The dsp chip is true according to the sequencing for the pulse signal for getting three square-wave signals
The phase sequence of the fixed three phase sine input signal.
Specifically, what the dsp chip arrived first in the pulse signal of three square-wave signals got
The corresponding sinusoidal input signal of pulse signal is determined as A phase sinusoidal input signals；To get described three of the dsp chip
The corresponding sinusoidal input signal of pulse signal of second arrival is determined as the sinusoidal input letter of B phases in the pulse signal of square-wave signal
Number；The pulse signal that the dsp chip arrives third in the pulse signal of three square-wave signals got corresponds to
Sinusoidal input signal be determined as C phase sinusoidal input signals.
For example, phase sequence variable U1, U2, U3 can be set in the dsp chip, the program for obtaining pulse signal is executed, when
When getting first pulse signal, phase sequence variable U1 assignment a are given, when getting second pulse signal, give phase sequence variable
U2 assignment b after the completion of giving phase sequence variable assignments c, dsp chip to obtain, show phase sequence when getting third pulse signal
The value of variable U1, U2, U3.
The embodiment of the present invention is converted into three square-wave signals by the three phase sine input signal for inputting three phase mains, point
The pulse signal of three square-wave signals is not obtained and according to the priority for the pulse signal for getting three square-wave signals
Sequence determines the phase sequence of the three phase sine input signal, by the corresponding sinusoidal input signal of get first pulse signal
It is determined as A phase sinusoidal input signals；It is sinusoidal that the corresponding sinusoidal input signal of get second pulse signal is determined as B phases
Input signal；The corresponding sinusoidal input signal of third pulse signal got is determined as C phase sinusoidal input signals, once
Detection can accurately determine the phase sequence of three phase sine input signal, convenient and simple.
Again referring to Fig. 3, the composed structure that Fig. 3 is a kind of detection device of three-phase phase sequence in the embodiment of the present invention is shown
It is intended to, wherein described device can be an independent detection device, or using an inspection in the equipment of three-phase electricity
Module is surveyed, described device as shown in the figure includes at least signal comparator circuit 210, dsp chip 220, wherein：
The signal comparator circuit 210 is connect with three phase mains, the three phase sine for obtaining the three phase mains input
The three phase sine input signal is generated three square-wave signals and exports three square-wave signals to described by input signal
Dsp chip 220；
The dsp chip 220 is connect with the signal comparator circuit 210, for obtaining three square-wave signals respectively
Pulse signal and determine that the three phase sine is defeated according to the sequencing of the pulse signal that gets three square-wave signals
Enter the phase sequence of signal.
Wherein, the three phase sine input signal includes the sinusoidal input signal that three phase differences are 120 °.
In an alternative embodiment, described device can also include switching circuit 230, wherein：
The signal comparator circuit 210 is connect by the switching circuit 230 with the three phase mains, the switching circuit
230 break-make for controlling the three phase sine input signal.
Specifically, for example the switching circuit 230 can be always maintained at off-state, when receiving " beating for dsp chip 220
Open instruction " when open, in this way can guarantee the three phase sine input signal three sinusoidal input signals be simultaneously emitted by.
Optionally, as shown in figure 4, the signal comparator circuit 210 may include operational amplification circuit 211, comparison circuit
212, wherein：
The operational amplification circuit 211 is connect with the first power supply of the three phase mains, output preset voltage value respectively, is used
In the three phase sine input signal for obtaining the three phase mains input, the three-phase inputted to the three phase mains with preset voltage value
Sinusoidal input signal carries out boosting biasing, and the three phase sine input signal after boosting biases is exported electric to the comparison
Road 212；
The comparison circuit 212 is connect with the operational amplification circuit 211, the dsp chip 220 respectively, for will be through
The three phase sine input signal crossed after boosting biasing generates three square-wave signals and exports three square-wave signals to described
Dsp chip 220.
Wherein, preset voltage value can be 1V, 2V, 3V etc., specifically can determine described first according to the actual conditions of circuit
The voltage value of power supply.
Optionally, the operational amplification circuit 211 may include three operational amplifiers, wherein：
Three operational amplifiers are connect with the three phase mains, the comparison circuit 212 respectively, for obtaining respectively
Three sinusoidal input signals of the three phase sine input signal of the three phase mains input, respectively with preset voltage value to described three
A sinusoidal input signal carries out boosting biasing, and is exported three sinusoidal input signals after boosting biasing are carried out respectively to described
Comparison circuit 212.
Optionally, the operational amplification circuit 211 can be made of integrated circuit and circuit element, such as similar to LM2902
The operation amplifier chip and resistance composition including at least three operational amplifier of chip；It can also be by multiple mutually independent fortune
It calculates amplifier and other circuit components forms.
Wherein, the amplifying power of operational amplifier is by the capture ability of dsp chip and the voltage of three phase sine input signal
Range determines that the capture ability of such as DSP is [0,3V], electricity when three phase sine input signal is input to the operational amplification circuit
Ranging from [- 1.5V, 1.5V], then amplifier amplifier need to have the ability that the voltage of three-phase sinusoidal signal is raised to 1.5V to pressure.
Illustrate the composition and the course of work of operational amplification circuit by taking the operation amplifier chip of model LM2902 as an example below.
For the pinouts of LM2902 operation amplifier chips as shown in figure 5, LM2902 operation amplifier chips share 14 pins, pin 4 is electricity
Press pin, pin 11 is grounding pin, pin 1,2,3, pin 5,6,7, pin 8,9,10 and pin 12,13,14 group respectively
At an operational amplifier, totally 4 operational amplifiers, in the present invention, operation amplifier chip is used for preset voltage value to institute
The three phase sine input signal for stating three phase mains input carries out boosting biasing, then needs to choose three fortune in operation amplifier chip
It calculates amplifier and is used as adder, the circuit connection diagram of operational amplification circuit is constituted as shown in fig. 6, figure using LM2902 chips
In 6, pin 5,6,7 is selected, the operation of the operational amplifier of pin 9,10,11 and pin 12,13,14 as composition adder
Amplifier, then positive input pin 5,10,12 connected respectively by three connecting lines of 3 resistance Ra and three phase mains, be used for
Three sinusoidal input signals of the three phase sine input signal of three phase mains input are obtained respectively, meanwhile, positive input pin 5,
10,12 1.5V voltages are accessed by 3 resistance Rb respectively, for carrying out boosting biasing to three sinusoidal input signals；Negative sense is defeated
Enter pin 6,9,13 and is respectively connected to output pin 7,8,14 by 3 resistance Rb respectively；Meanwhile negative sense input pin 6,9,13
Respectively by 3 resistance Ra ground connection, output pin 7,8,14 is respectively connected to comparison circuit, according to empty short and empty conclude reason
U7=U5+1.5V, U8=U10+1.5V, U14=U12+1.5V, wherein U5, U8, U14 are respectively three phase sine input signal
Voltage when three sinusoidal signals are exported to LM2902 chips, after U7, U8, U7 is three sinusoidal signals after boosting biases
Voltage.
Optionally, the positive input pin 5,10,12 can also access the power supply for having other voltage values, be not limited only to
1.5V, such as can be 2V, 3V etc..
Three phase sine input signal can be made to raise 1.5V using operational amplification circuit shown in fig. 6, such as inclined by boosting
Three phase sine applied signal voltage ranging from [- 1.5V, 1.5V] before setting, then the three phase sine after boosting biases, which inputs, believes
Number voltage range be [0,3V], i.e. operational amplifier makes the voltage of three phase sine input signal raise 1.5V.
Optionally, the comparison circuit 212 may include three comparators, wherein：
Three comparators are connect with the operational amplification circuit 211, the dsp chip 220 respectively, respectively will be used for
Three sinusoidal input signals of the three phase sine input signal after boosting biases generate three square-wave signals and by institute respectively
Three square-wave signals are stated to export to the dsp chip 220.
Optionally, three comparators connect (i.e. described second electricity with the second source of output preset voltage value respectively
The numerical value for the voltage that source can provide is identical as the numerical value of voltage that first power supply can provide).
Optionally, the comparison circuit can be made of integrated circuit and circuit element, such as include similar to LM2901
The operation amplifier chip and resistance of at least three operational amplifier are constituted；It can also be by multiple mutually independent comparators and other
Circuit components form.
Illustrate the course of work of comparison circuit with the comparable chip of model LM2901 below.The operation chip of LM2901
Pin relationship can be with as shown in fig. 7, LM2901 operational amplification circuits share 14 pins, pin 3 be voltage pin, and pin 12 is
Grounding pin, pin 2,4,5, pin 1,6,7, pin 8,9,14 and pin 10,11,13 separately constitute a comparator, and totally 4
A comparator needs as follows using wherein three comparators, the treatment mechanism of comparator in the present invention：When the forward direction of comparator
When the voltage of input pin is higher than the voltage of negative sense input pin, output pin exports high level signal；When the forward direction of comparator
The voltage of sinusoidal input signal is less than the electricity of negative sense input pin when the voltage of input pin is less than the voltage of negative sense input pin
When pressure, output pin exports low level signal.The circuit connection diagram that comparison circuit is constituted using LM2901 chips can be such as 8
It is shown, in Fig. 8, the comparator as generation square wave of pin 1,6,7, pin 8,9,14 and pin 10,11,13 is selected, then
Positive input pin 7,9,11 is connect with operational amplification circuit respectively, for receiving the inclined by boosting of operational amplification circuit output
The three phase sine input signal postponed, while positive input pin 7,9,11 is connected to output pin by 3 resistance Rc respectively
1,13,14, negative sense input pin 6,8,10 accesses 1.5V voltages by 3 resistance Rd respectively.
Optionally, negative sense input pin 6,8,10 can also access the power supply for having other voltage values, wherein negative sense inputs
The voltage value that pin 6,8,10 accesses can be consistent with the voltage value of power supply that operational amplification circuit accesses.
Specifically, effect as shown in Figure 2 can be generated using comparison circuit shown in Fig. 8, wherein figure A is to be input to Fig. 8
In positive input pin 7,9,11 when three phase sine input signal, figure B is comparator according to three phase sine input signal
The square-wave signal that voltage is exported compared with the voltage of negative sense input pin 6,8,10 by output pin 1,13,14.
Optionally, the signal comparator circuit 210 can also include voltage follower circuit 213, wherein：
The operational amplification circuit 211 is connect by the voltage follower circuit 213 with the comparison circuit 212.
Optionally, the voltage follower circuit can be integrated circuit, for example, make similar to the isolation that can play of LM2902
Integrated circuit.
Optionally, the voltage follower circuit may include at least three voltage follower.
Three phase sine input signal after comparison circuit becomes square-wave signal, can be to by transporting when square-wave signal is overturn
The three phase sine input signal for calculating amplifying circuit has an impact (such as can make three phase sine waveform input signal distortion etc.) and causes
Detection is inaccurate, and the voltage follower in voltage follower circuit can play the role of that two-stage circuit is isolated, and make operational amplification circuit
It can be worked normally with the circuit of comparison circuit.
Optionally, the signal comparator circuit 210 can also include bleeder circuit 214, wherein：
The three phase mains is connect by the bleeder circuit 214 with the operational amplification circuit 211；
The bleeder circuit 214 is used for the three phase sine input signal reduced output voltage that inputs the three phase mains to described
Operational amplification circuit 211.
Optionally, the bleeder circuit can be made of multiple divider resistances, in the specific implementation, can be according to dsp chip
The ability of capture voltage and the voltage value setting of first power supply determine the voltage for needing to be walked by divider resistance point.
For example, the ability of dsp chip capture voltage is [0,3V], the voltage value of the first power supply is 1.5V, then can obtain
Voltage range when three phase sine input signal is exported to the operation chip is [- 1.5V, 1.5V], the three of three phase mains output
The initial voltage range of phase sinusoidal input signal is [- 220V, 220V], it is determined that needs the voltage walked by divider resistance point to be
202.5V。
Optionally, the dsp chip 220 includes at least three I/O mouthfuls, wherein:
The signal comparator circuit 210 is connect with described three I/O mouthfuls respectively；
Three square-wave signals are input to DSP cores by the signal comparator circuit 210 respectively by described three I/O mouthfuls
Piece 220.
In another alternative embodiment, above-mentioned signal comparator circuit can be by having the replacement of the integrated chip of said function.
In the embodiment of the present invention, the three phase sine input signal that three phase mains inputs is converted into three by signal comparator circuit
Square-wave signal, dsp chip obtain the pulse signal of three square-wave signals and believe according to three square waves are got respectively
Number the sequencing of pulse signal determine the phase sequence of the three phase sine input signal, by get first pulse signal
Corresponding sinusoidal input signal is determined as A phase sinusoidal input signals；The corresponding sine of get second pulse signal is defeated
Enter signal and is determined as B phase sinusoidal input signals；The corresponding sinusoidal input signal of third pulse signal got is determined as C
Phase sinusoidal input signal, one-time detection can accurately determine the phase sequence of three phase sine input signal, convenient and simple.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium
In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
Unit in device of the embodiment of the present invention can be combined, divided and deleted according to actual needs.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (10)
1. a kind of detection method of three-phase phase sequence, which is characterized in that the method includes：
Signal comparator circuit obtains the three phase sine input signal of three phase mains input；
The three phase sine input signal is generated three square-wave signals by the signal comparator circuit；
The signal comparator circuit exports three square-wave signals to dsp chip；
The dsp chip obtains the pulse signal of three square-wave signals respectively；
The dsp chip determines the three phase sine according to the sequencing for the pulse signal for getting three square-wave signals
The phase sequence of input signal.
2. the method as described in claim 1, which is characterized in that the dsp chip is according to getting three square-wave signals
The sequencing of pulse signal determine that the phase sequence of the three phase sine input signal includes：
The dsp chip corresponds to the pulse signal of first arrival in the pulse signal of three square-wave signals got
Sinusoidal input signal be determined as A phase sinusoidal input signals；
The dsp chip corresponds to the pulse signal of second arrival in the pulse signal of three square-wave signals got
Sinusoidal input signal be determined as B phase sinusoidal input signals；
The pulse signal that the dsp chip arrives third in the pulse signal of three square-wave signals got corresponds to
Sinusoidal input signal be determined as C phase sinusoidal input signals.
3. a kind of detection device of three-phase phase sequence, which is characterized in that described device includes signal comparator circuit, dsp chip,
In：
The signal comparator circuit is connect with three phase mains, and the three phase sine for obtaining the three phase mains input inputs letter
Number, the three phase sine input signal is generated into three square-wave signals and exports three square-wave signals to the DSP cores
Piece；
The dsp chip is connect with the signal comparator circuit, the pulse signal for obtaining three square-wave signals respectively
And the phase of the three phase sine input signal is determined according to the sequencing for the pulse signal for getting three square-wave signals
Sequence.
4. device as claimed in claim 3, which is characterized in that the signal comparator circuit includes operational amplification circuit, compares
Circuit, wherein：
The operational amplification circuit is connect with the first power supply of the three phase mains, output preset voltage value respectively, for obtaining
The three phase sine input signal of the three phase mains input, it is defeated with the three phase sine that preset voltage value inputs the three phase mains
Enter signal and carry out boosting biasing, and the three phase sine input signal after boosting biases is exported to the comparison circuit；
The comparison circuit is connect with the operational amplification circuit, the dsp chip respectively, and being used for will be after boosting biases
Three phase sine input signal generates three square-wave signals and exports three square-wave signals to the dsp chip.
5. device as claimed in claim 4, which is characterized in that the operational amplification circuit includes three operational amplifiers,
In：
Three operational amplifiers are connect with the three phase mains, the comparison circuit respectively, for obtaining described three respectively
Three sinusoidal input signals of the three phase sine input signal of phase power input, respectively with preset voltage value to three sines
Input signal carries out boosting biasing, and will carry out three sinusoidal input signals after boosting biasing export respectively it is electric to the comparison
Road.
6. device as claimed in claim 4, which is characterized in that the comparison circuit includes three comparators, wherein：
Three comparators are connect with the operational amplification circuit, the dsp chip respectively, inclined for that will pass through boosting respectively
Three sinusoidal input signals of the three phase sine input signal postponed generate three square-wave signals and respectively by three square waves
Signal is exported to the dsp chip.
7. such as claim 4-6 any one of them devices, which is characterized in that the signal comparator circuit further includes voltage follow
Circuit, wherein：
The operational amplification circuit is connect by the voltage follower circuit with the comparison circuit.
8. such as claim 4-6 any one of them devices, which is characterized in that the signal comparator circuit further includes partial pressure electricity
Road, wherein：
The three phase mains is connect by the bleeder circuit with the operational amplification circuit；
The bleeder circuit is for putting three phase sine input signal reduced output voltage to the operation that the three phase mains inputs
Big circuit.
9. device as claimed in claim 3, which is characterized in that the dsp chip includes three I/O mouthfuls, wherein：
The signal comparator circuit is connect with described three I/O mouthfuls respectively；
Three square-wave signals are input to dsp chip by the signal comparator circuit respectively by described three I/O mouthfuls.
10. device as claimed in claim 3, which is characterized in that the dsp chip is specifically used for：
By the corresponding sinusoidal input of the pulse signal of first arrival in the pulse signal of three square-wave signals got
Signal is determined as A phase sinusoidal input signals；
By the corresponding sinusoidal input of the pulse signal of second arrival in the pulse signal of three square-wave signals got
Signal is determined as B phase sinusoidal input signals；
The corresponding sinusoidal input of pulse signal that third in the pulse signal of three square-wave signals got is arrived
Signal is determined as C phase sinusoidal input signals.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/098834 WO2019037029A1 (en) | 2017-08-24 | 2017-08-24 | Method and device for detecting phase sequence of three-phase power supply |
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| CN108351375A true CN108351375A (en) | 2018-07-31 |
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| CN201780003766.7A Pending CN108351375A (en) | 2017-08-24 | 2017-08-24 | A kind of detection method and device of three-phase phase sequence |
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| CN (1) | CN108351375A (en) |
| WO (1) | WO2019037029A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444559A (en) * | 2018-10-26 | 2019-03-08 | 苏州瑞迈斯医疗科技有限公司 | The method of sampling, method for reconstructing and the device of pulse signal |
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| WO2019037029A1 (en) | 2019-02-28 |
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