CN106253730B - Power inverter and electric current detecting method - Google Patents
Power inverter and electric current detecting method Download PDFInfo
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- CN106253730B CN106253730B CN201610391197.5A CN201610391197A CN106253730B CN 106253730 B CN106253730 B CN 106253730B CN 201610391197 A CN201610391197 A CN 201610391197A CN 106253730 B CN106253730 B CN 106253730B
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/084—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Abstract
The present invention provides a kind of power inverter and electric current detecting method that can easily be done current detecting.Power inverter involved in embodiment includes the first branch line, the second branch line, test section.First branch line and the second branch line are respectively provided with multiple switch element, and are connected in parallel with each other.Test section detects the electric current flowed through in the connecting line for being connected in parallel the first branch line and the second branch line.
Description
Technical field
Embodiments of the present invention are related to power inverter and electric current detecting method.
Background technique
Conventionally, there is known following technology: in the electric power for the converting direct-current voltage into alternating-current voltage that will be provided from DC power supply
In conversion equipment, detected based on the voltage that the both ends of shunt resistance of the configuration between inverter circuit and DC power supply generate
It exports electric current (for example, with reference to patent document 1).
Citation
Patent document
Patent document 1: special open 2013-247695 bulletin.
Summary of the invention
Problem to be solved by the invention
But in above-mentioned previous power inverter, there are following situations: when the output pulse of inverter circuit
Width it is narrow when, it is difficult to carry out current detecting, it is therefore necessary to form switching mode in such a way that the width of pulse does not narrow
(switching pattern)。
A kind of form of embodiment provides the power inverter that can be easy to carry out current detecting and current detecting side
Method.
The means used to solve the problem
The power inverter that a kind of form of embodiment is related to includes the first branch line and the second branch line and test section.
First branch line and the second branch line are respectively provided with multiple switch element, and connect parallel with one another.The detection
The electric current flowed through in the connecting line for being connected in parallel first branch line and second branch line is detected in portion.
The effect of invention
According to a kind of form of embodiment, it is capable of providing the power inverter and electricity that can be easy to carry out current detecting
Flow detection method.
Detailed description of the invention
Fig. 1 is the figure for showing the configuration example for the power inverter that embodiment is related to；
Fig. 2 is the figure for showing the configuration example of test section；
Fig. 3 is the figure for showing the configuration example of PWM control unit；
Fig. 4 is the relationship shown between the state of each phase branch line in power conversion unit shown in FIG. 1 and detection electric current
Figure；
Fig. 5 is the figure for showing the state of electric current when exporting zero vector from converter section；
Fig. 6 is the figure for obtaining the relationship between timing for showing voltage instruction, carrier wave, pwm signal and detection electric current；
Fig. 7 is the figure for showing other configuration examples of converter section；
Fig. 8 is the figure for showing the relationship between the state of each branch line in power conversion unit shown in Fig. 7 and detection electric current；
Fig. 9 is the figure for showing other configuration examples of converter section；
Figure 10 is the figure for showing other configuration examples of converter section；
Figure 11 is the figure for showing the configuration example in reckoning portion；
Figure 12 is the flow chart for showing the process of the processing carried out by control unit；
Figure 13 is the figure for showing other configuration examples of power inverter involved in embodiment.
Specific embodiment
Hereinafter, referring to attached drawing, it is detailed to the embodiment of power inverter disclosed in the present application and electric current detecting method
Ground is illustrated.In addition, the present invention is not limited by embodiment as shown below.
[1. power inverter]
Fig. 1 is the figure for showing the configuration example of power inverter 1 involved in embodiment.Electrical power conversion shown in FIG. 1
Device 1 configures between DC power supply 2 and motor 3.The power inverter 1 includes converter section 10 and control unit 20.Control
Portion 20 controls converter section 10, so that converter section 10, which is executed, is converted into AC power for the direct current power provided from DC power supply 2
Movement.
Although in addition, power inverter shown in FIG. 11 configuration between DC power supply 2 and motor 3,
It can be only fitted between AC power source and motor 3.In this case, power inverter 1 includes rectifier, the rectifier
The AC power provided from AC power source is converted into direct current power and is provided to DC bus 12,13.
[2. converter section 10]
Converter section 10 includes capacitor C1 and three-phase bridge circuit 11.Capacitor C1 is configured between DC bus 12,13,
Voltage Vpn (hereinafter, being recorded as busbar voltage Vpn) DC bus 12,13 is carried out smooth.Three-phase bridge circuit 11 includes
U phase branch line (leg) 14u (an example of the first branch line), V phase branch line 14v (an example of the second branch line) and W phase branch line 14w (
An example of three branch).
U phase branch line 14u, V phase branch line 14v and W phase branch line 14w is connected in parallel with each other by connecting line 15,16, and from connection
It is configured in order in the DC bus 12 of the DC side of converter section 10,13 sides.In addition, existing under U phase branch line 14u, V phase branch line
The case where 14v and W phase branch line 14w is collectively referred to as branch line 14.
U phase branch line 14u includes a pair of switches element Swup, the Swun being connected in series, and V phase branch line 14v includes being connected in series
A pair of switches element Swvp, Swvn, W phase branch line 14w include be connected in series a pair of switches element Swwp, Swwn.In addition, with
Under switch element Swup, Swvp, Swwp are known as upper arm sometimes, switch element Swun, Swvn, Swwn are known as lower arm.
Switch element Swup, Swun, Swvp, Swvn, Swwp, Swwn (hereinafter, sometimes referred to as switch element Sw) are for example
It is MOSFET (Metal-Oxide-SemiconductorField-EffectTransistor, metal oxide semiconductcor field effect
Answer transistor) or the semiconductor switch such as IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor)
Element.In addition, switch element Sw is also possible to generation semiconductor switch element SiC, GaN.
The tie point of switch element Swup and switch element Swun are connected to the U phase of motor 3, switch element Swvp and open
The tie point for closing element Swvn is connected to the V phase of motor 3.In addition, the tie point of switch element Swwp and switch element Swwn
It is connected to the W phase of motor 3.
Test section 17 is provided between U phase branch line 14u and V phase branch line 14v.The test section 17 detection is by U phase branch line 14u
The electric current flowed through in the connecting line 16 being connected in parallel with V phase branch line 14v.
In example shown in Fig. 1, connecting line 16 be divided between U phase branch line 14u and V phase branch line 14v connecting line 16a and
Connecting line 16b, test section 17 detect the electric current flowed through between connecting line 16a, 16b.
It is flowed in the connecting line 16 for being connected in parallel U phase branch line 14u and V phase branch line 14v in this way, test section 17 is able to detect
The electric current crossed, therefore in the case where exporting zero vector from converter section 10, it is able to detect and is flowed between converter section 10 and motor 3
The electric current crossed.Therefore, even if also can in the case where the width of the switching pulse (Switching pulse) of converter section 10 is small
Enough it is easy to carry out current detecting.The point will be described later in detail.
In addition, not dividing connecting line 16, it will be able to examine by test section 17 in the case where test section 17 is non-contact type
Survey the electric current flowed through in the connecting line 16 for being connected in parallel U phase branch line 14u and V phase branch line 14v.In addition, by U phase branch line 14u,
As long as the connecting line 15,16 that V phase branch line 14v and W phase branch line 14w is connected in parallel with each other is configured to flow through electric current, example
As can be the distribution component as metal wire is wrapped by, alternatively, it is also possible to be formed in the pattern on substrate.
Fig. 2 is the figure for showing the configuration example of test section 17.Test section 17 shown in Fig. 2 includes shunt resistance 18 and amplification electricity
Road 19, shunt resistance 18 are connected between connecting line 16a, 16b.Amplifying circuit 19 puts the both end voltage of shunt resistance 18
Greatly, and the instantaneous value of the electric current flowed through between connecting line 16a, 16b is exported (hereinafter, being recorded as detection electric current io)。
For example, being put in the case where the resistance value of shunt resistance 18 is R1, the both end voltage of shunt resistance 18 is voltage v1
Big circuit 19 is exported to voltage v1 multiplied by the value of COEFFICIENT K (=1/R1), as detection electric current io。
Test section 17 is not limited to composition shown in Fig. 2.For example, test section 17 is also possible to substitute shunt resistance 18 and have
The composition of Hall element as magnetoelectric conversion element.In this case, test section 17 amplifies Hall element with amplifying circuit
Output voltage and as detection electric current ioOutput.
In addition, test section 17 be also possible to substitute shunt resistance 18 and with current transformer composition.In such case
Under, test section 17 for example can be directly according to the inspection of the voltage output of the resistance at the both ends for the secondary coil for being connected to current transformer
Survey electric current io, alternatively, according to the electricity of the resistance at the both ends for the secondary coil for being connected to current transformer by amplifying circuit amplification
Pressure, output detection electric current io。
In addition, the case where test section 17 is non-contact type (such as the test section or mutual comprising electric current comprising Hall element
The case where test section of sensor) under, do not divide connecting line 16, it will be able to by the detection of test section 17 by U phase branch line 14u and V
The electric current flowed through in the connecting line 16 that phase branch line 14v is connected in parallel.
[compositions of 3. control units 20]
Return to the explanation that Fig. 1 continues power inverter 1.The control unit 20 of power inverter 1 includes reckoning portion 21, turns
Change coordinate conversion portion, portion 22,25, current-order generating unit 23, current control unit 24 and PWM control unit 26.
Control unit 20 is for example including with CPU (CentralProcessingUnit, central processing unit), ROM
(ReadOnlyMemory, read-only memory), RAM (RandomAccessMemory, random access memory), input/output terminal
The microcomputer of son etc. or various circuits.The CPU of the microcomputer reads the program being stored in ROM and execution, thus
Realize aftermentioned control.
Reckoning portion 21, converter section coordinate conversion portion 22,25, current-order generating unit 23, current control unit 24 and PWM control
The function in portion 26 for example reads above procedure and execution by above-mentioned CPU to realize.In addition, reckoning portion 21, converter section coordinate becomes
Change portion 22,25, current-order generating unit 23, current control unit 24 and PWM control unit 26 it is respective part or all can also be with
It is made of hardware.
Reckoning portion 21 is based on the detection electric current i exported from test section 17o, calculate the current instantaneous value i of U phase, V phase and W phaseu、
iv、iw(it is recorded as phase current i belowu、iv、iw) among in addition to detection electric current ioTwo except corresponding phase current are mutually electric
Stream, and by phase current iu、iv、iwIt exports to converter section coordinate conversion portion 22.
Converter section coordinate conversion portion 22 is by phase current iu、iv、iwIt is converted by 3 phase, one 2 phase in fixed coordinate
After the α β component of upper two orthogonal axis, these components are converted into the q of the dq axis rotated according to phase theta rotation coordinate system
Axis component is (hereinafter, be recorded as q shaft current iq) and d axis component (hereinafter, being recorded as d shaft current id).In addition, d axis is and motor
The parallel axis of the magnetic flux that 3 rotor generates, q axis is the axis orthogonal with d axis.In addition, phase theta is the rotor-position of motor 3
(electrical angle) is detected by encoder 4, and is notified to control unit 20.
Current-order generating unit 23 for example instructs ω based on angular speeda *, generate q shaft current and instruct iq *It is instructed with d shaft current
id *, and exported to current control unit 24.Current control unit 24 generates q shaft voltage and instructs vq *Q shaft current is set to instruct iq *With q axis electricity
Flow iqDeviation become 0, and generate d shaft voltage instruction vd *D shaft current is set to instruct id *With d shaft current idDeviation become 0.Example
Such as, current control unit 24 is by instructing i to q shaft currentq *With q shaft current iqDeviation carry out proportional plus integral control and generate q axis
Voltage instruction vq *, and by instructing i to d shaft currentd *With d shaft current idDeviation carry out proportional plus integral control to generate d axis electricity
Pressure instruction vd *。
Q shaft voltage is being instructed v by converter section coordinate conversion portion 25q *V is instructed with d shaft voltaged *It is transformed into and is put in fixing seat
After the α β component of two orthogonal axis, which is subjected to the conversion of 2 phase, one 3 phase according to phase theta.Q axis as a result,
Voltage instruction vq *V is instructed with d shaft voltaged *It is transformed into the voltage instruction v of U phase, V phase and W phaseu *、vv *、vw *。
PWM control unit 26 generates the voltage instruction v with U phase, V phase and W phaseu *、vv *、vw *Corresponding PWM
(pulseWidthModulation) signal Sup, Sun, Svp, Svn, Swp, Swn.
Above-mentioned pwm signal Sup, Sun, Svp, Svn, Swp, Swn (hereinafter, being collectively referred to as pwm signal So sometimes) are as shown in Figure 1
As be input to switch element Swup, Swun, Swvp, Swvn, Swwp, Swwn.As a result, from converter section 10 output with
Voltage instruction vu *、vv *、vw *The voltage converter section of corresponding U phase, V phase and W phase.In addition, power inverter 1 also may be constructed
It is input to switch element Sw later to amplify pwm signal So by not shown amplifier.
In pwm signal Sup, Sun in the case where one is significant level (for example, High level), another one has to be non-
It imitates level (for example, Low level).Such relationship is also likewise, in addition, for pwm signal for pwm signal Svp, Svn
Swp, Swn are also same.
Fig. 3 is the figure for showing the configuration example of PWM control unit 26.PWM control unit 26 shown in Fig. 3 includes carrier wave generating unit
30, comparing section 31~33 and the non-portion (NOT) 34~36.The carrier wave Sc of the generation of carrier wave generating unit 30 predetermined period Ta.Carrier wave Sc
The for example, signal of triangular wave.
Comparing section 31 is to voltage instruction vu *It is compared with carrier wave Sc, exports pwm signal Sup corresponding with comparison result.
The comparing section 31 is for example in voltage instruction vu *In the case where carrier wave Sc or more, the pwm signal Sup of High level is exported, in electricity
Pressure instruction vu *In the case where carrier wave Sc, the pwm signal Sup of Low level is exported.Similarly, comparing section 32 is to voltage instruction
vv *It is compared with carrier wave Sc, exports pwm signal Svp corresponding with comparison result.In addition, comparing section 33 is to voltage instruction vw *
It is compared with carrier wave Sc, exports pwm signal Swp corresponding with comparison result.
Non- portion 34 inverts the level of pwm signal Sup to generate pwm signal Sun.For example, non-portion 34 is in pwm signal
In the case that Sup is significant level (active level), the pwm signal of non-effective level (Non-active level) is generated
Sun generates the pwm signal Sun of significant level in the case where pwm signal Sup is non-effective level.Similarly, non-portion 35 is right
The level of pwm signal Svp is inverted to generate pwm signal Svn, and non-portion 36 carries out reversion next life to the level of pwm signal Swp
At pwm signal Swn.
In addition, PWM control unit 26 can pass through dead time processing unit setting dead time (not shown).Dead time is
The time for postponing the opening action of switch element Sw is the switch of the switch element and composition lower arm in order to avoid constituting upper arm
Element opens simultaneously and is arranged.
The dead time processing unit of PWM control unit 26 can postpone that pwm signal So is made to become effective electricity from non-effective level
Flat timing, thus sets dead time.In addition it is also possible to which having comparing section 31~33 and non-portion 34~36 makes pwm signal
So becomes the function of the constant time lag of significant level from non-effective level.
[relationship of acquisition and the PWM control of 4. detection electric currents]
Then, to the detection electric current i in reckoning portion 21oAcquisition and PWM control unit 26 PWM control relationship said
It is bright.Fig. 4 is the state and detection electric current i for showing each phase branch line 14oBetween relationship figure, as the state of each phase branch line 14,
The state that the upper arm of branch line 14 is ON is set as " 1 ", the state that the lower arm of branch line 14 is ON is set as " 0 ".
As shown in figure 4, for example, in the case where all ON of the lower arm of U phase, V phase and W phase, it is defeated from three-phase bridge circuit 11
Zero vector V0 out, the detection electric current i of test section 17oIt is the phase current i of U phaseu。
Fig. 5 is the figure for showing the state of electric current when exporting zero vector V0 from converter section 10.As shown in figure 5, test section 17
Detect the electric current flowed through in V phase and W phase.If whole electric currents of U phase, V phase and W phase are added, become 0, therefore,
In the state of the output of converter section 10 zero vector V0, test section 17 can be by u phase current iu(=- iv-iw) as detection electric current io
Output.
Fig. 6 is to show voltage instruction vu *、vv *、vw *, carrier wave Sc, pwm signal Sup, Svp, Swp and detection electric current ioObtain
Take the figure of the relationship of timing.PWM control unit 26 (referring to Fig.1, Fig. 3) is as shown in Figure 6 to carrier wave Sc and voltage instruction vu *、
vv *、vw *It is compared, generates pwm signal Sup, Svp, Swp.In addition, pwm signal Sun, Svn, Swn be to pwm signal Sup,
The signal that the level of Svp, Swp are inverted, therefore omitted in Fig. 6.
Reckoning portion 21 (referring to Fig.1) is by the timing (moment t1, t9, t17) of the trough of carrier wave Sc as detection electric current io's
Timing is obtained, detection electric current i is obtainedo.Control unit 20 is able to detect one electric current in U phase, V phase and W phase current as a result,.
The timing of the trough of carrier wave Sc is the detection electric current of the test section 17 in this period during exporting zero vector V0 from converter section 10
ioFor U phase current iu。
On the other hand, if detection electric current test section 17 between capacitor C1 and three-phase bridge circuit 11 (for example,
Position A shown in fig. 5), during exporting zero vector V0 from converter section 10, without flow through electricity in the test section 17 at the A of position
Stream.Therefore, in the case where the position shown in test section 17 is located at position A, during exporting effective vector from converter section 10,
Carry out current detecting.But in the case that (width of output pulse) is short during effective vector, it is difficult to electric current is detected, because
This on switching mode it is necessary to work hard, so that the width of output pulse does not narrow.
On the other hand, in the power inverter 1 involved in embodiment, as described above, zero vector can when exporting
Current detecting is carried out, therefore does not have to form the switching mode for considering output pulse width, just can be carried out current detecting.
In converter section 10 shown in Fig. 1, flowed through in the connecting line 16 between U phase branch line 14u and V phase branch line 14v
The position detected of electric current at be configured with test section 17, as long as but the configuration of test section 17 be able to detect will be multiple
The position of the electric current flowed through in the connecting line 15,16 that branch line 14 is connected in parallel.
Fig. 7 is the figure for showing other configuration examples of converter section 10.The test section 17 of converter section 10 shown in Fig. 7 is configured in U
Between phase branch line 14u and V phase branch line 14v, detect in the connecting line 15 for being connected in parallel U phase branch line 14u and V phase branch line 14v
The electric current flowed through.
In example shown in Fig. 7, connecting line 15 be divided between U phase branch line 14u and V phase branch line 14v connecting line 15a and
Connecting line 15b, test section 17 detect the electric current flowed through between connecting line 15a, 15b.In addition, being non-contact type in test section 17
In the case where, do not divide connecting line 15, it will be able to by the detection of test section 17 U phase branch line 14u and V phase branch line 14v is in parallel
The electric current flowed through in the connecting line 15 of connection.It is also same in the other configurations example of aftermentioned test section 17 about this point
's.
Fig. 8 is the state and detection electric current i for showing each branch line 14 of converter section 10 shown in Fig. 7oRelationship figure.Such as figure
Shown in 8, in the case where exporting zero vector V7 from converter section 10, test section 17 can be by U phase current iuReverse value as inspection
Survey electric current ioOutput.
Zero vector V7 is that the upper arm of U phase, V phase and W phase is the state of ON, and test section 17 can be in the wave crest of carrier wave Sc
Periodically (t5, t13 at the time of Fig. 6) is by U phase current iuReverse value as detection electric current ioOutput.
Therefore, the power inverter 1 with converter section 10 as shown in Figure 7 can also carry out electricity when zero vector exports
Stream detection, therefore can not also form the switching mode for considering output pulse width, in addition, also can be realized it is cost effective or
Miniaturization.
In addition, substitution configures test section 17 between U phase branch line 14u and V phase branch line 14v, it can also be such as Fig. 9 and Figure 10 institute
Test section 17 is configured as showing between the connecting line 15,16 for being connected in parallel V phase branch line 14v and W phase branch line 14w.Fig. 9 and
Figure 10 is the figure for showing other configuration examples of converter section 10.
In the converter section 10 of Fig. 9, in the connecting line 16 that V phase branch line 14v and W phase branch line 14w is connected in parallel by detection
Test section 17 is configured at the position of the electric current flowed through.Test section 17 as shown in Figure 9 is exporting zero vector V0's from converter section 10
In the case of, by the phase current i of W phasewReverse value as detection electric current ioOutput.
In addition, in the converter section 10 of Figure 10, in the connection that V phase branch line 14v and W phase branch line 14w is connected in parallel by detection
Test section 17 is configured at the position of the electric current flowed through in line 15.Test section 17 as shown in Figure 10 is exporting null vector from converter section 10
In the case where measuring V7, by the phase current i of W phasewAs detection electric current ioOutput.
[5. reckoning portion 21]
Then, the configuration example in reckoning portion 21 is illustrated.Figure 11 is the figure for showing the configuration example in reckoning portion 21.
As shown in figure 11, reckoning portion 21 includes A/D converter section 40, timing determination portion 41, all-pass filter portion 42, pre-transform
Portion 43, phase-detection portion 44, amplitude detection portion 45, phase correction section 46, adder 47 and three-phase current reproducing unit 48.
A/D converter section 40 will test the detection electric current i in portion 17 in the acquisition timing determined by timing determination portion 41oFrom mould
It is quasi- to be converted into number and export to all-pass filter portion 42 and phase-detection portion 44.
It is, for example, Fig. 1 or in the case where composition shown in Fig. 9 in converter section 10, timing determination portion 41 is by the trough of carrier wave Sc
Timing (for example, moment t1, t9, t17 shown in fig. 6) as obtain timing, make A/D converter section 40 act.Control unit as a result,
20 can be in the detection electric current i of the timing of the trough of carrier wave Sc detection test section 17o。
In addition, be, for example, Fig. 7 or in the case where composition shown in Fig. 10 in converter section 10, timing determination portion 41 is by carrier wave Sc
Wave crest timing (for example, moment t5, t13 shown in fig. 6) as obtain timing, make A/D converter section 40 act.It controls as a result,
It portion 20 processed can be in the detection electric current i of the timing of the wave crest of carrier wave Sc detection test section 17o。
All-pass filter portion 42 has all-pass filter, is not changing detection electric current ioAmplitude in the case where prolong phase
Slow 90 degree.Shown in the transmission function of all-pass filter such as following formula (1).In addition, " ωn" be for make 90 degree of phase delay cut
Only frequency.In addition, the gain for frequency is 1 in the transmission function shown in following formula (1), pass through cutoff frequency ωn, phase
Position is delayed by 90 degree.
[number 1]
Here, when transmission function shown in above-mentioned formula (1) is carried out discretization with bilinear transformation, the bilinear transformation
Formula can be indicated by following formula (2).In following formula, " T " indicates the sampling period.
[number 2]
When transmission function of the transform using above-mentioned formula (2) to above-mentioned (1) carries out discretization, can be expressed as
State formula (3).
[number 3]
Here, can be indicated such as following formula (5) if solving following formula (4) using above-mentioned formula (3).All-pass filter portion
42 by will test electric current ioIt is set as shown in following formula (5) " X ", finds out shown in following formula (5) " Y ", which is used as and is prolonged
Slow electric current io' output.As a result, all-pass filter portion 42 can will with detection electric current ioAmplitude is identical, 90 degree of electricity of phase delay
Stream is used as delayed current io' output.In addition, " Y z-1" be " Y " upper sub-value (1 time sampling before value), " X z-1" it is the upper of " X "
Sub-value.
[number 4]
Y=G (z) X ... (4)
Pre-transform portion 43 passes through the operation of following formula (6), finds out the cutoff frequency ω in all-pass filter portion 42n, with can
Correct the frequency distortion generated due to above-mentioned bilinear transformation.
[number 5]
In addition, " the ω in above-mentioned formula (6)a" it is the electric current of the U phase, V phase and the W phase that are exported from converter section 10 (hereinafter, sometimes
Be recorded as output electric current) frequency (hereinafter, sometimes referred to as output frequency ωa).It pre-transform portion 43 for example can be by angular speed
Instruct ωa *As output frequency ωa, find out cutoff frequency ωn.In addition, pre-transform portion 43 can be micro- by carrying out to phase theta
Divide to find out output frequency ωa。
Phase-detection portion 44 is for example by the operation of following formula (7), by detection electric current ioWith delayed current io' find out output
The phase theta i of electric current (hereinafter, sometimes referred to as current phase θ i).Amplitude detection portion 45 for example by the operation of following formula (8),
Find out the amplitude Iam of output electric current.In addition, in detection electric current ioFor U phase current iuIn the case where, as U phase current iuIt is positive most
When big value, current phase θ i is θ i=0.
[number 6]
Phase correction section 46 exports the phase correction values Δ θ for adjusting current phase θ i.Adder 47 is by electric current
Phase theta i generates phase theta plus phase correction values Δ θ.Three-phase current reproducing unit 48 for example passes through the operation of following formula (9), energy
Reach the electric current i by finding out U phase, V phase and W phaseu、iv、iwTo calculate the electric current i of V phase and W phasev、iw。
[number 7]
iu=Iam × cos (θ)
In this way, control unit 20 converter section 10 export zero vector in the state of, be able to detect in U phase, V phase and W phase one
The electric current of phase, the electric current that remaining phase is calculated based on the detection electric current.Therefore, a current detecting part is able to use to determine
Three electric currents realize the cost effective of power inverter 1 and miniaturization.
On the other hand, the case where three current detecting parts carry out current detecting is set between converter section 10 and motor 3
Under, since the quantity of current detecting part becomes more, it is thus possible to interfere cost effective or miniaturization.
In addition, presumption unit 21 is not limited to composition shown in Figure 11, as long as the electric current based on U phase, V phase and W Xiang Zhongyi phase,
It can calculate the composition of remaining electric current.For example, in the case where converter section 10 is composition shown in Fig. 7, in reckoning portion
In 21, by by the detection electric current i to test section 17oThe positive and negative inversion portion inverted A/D converter section 40 is set before
Grade or rear class, can make the detection electric current i being input in all-pass filter portion 42 or phase-detection portion 44oAs U phase current iu。
In addition, in the case where converter section 10 is composition shown in Fig. 10, for example, leading in three-phase current reproducing unit 48
Cross carry out iu=Iam × cos (+4 π/3 θ), iv=Iam × cos (+2 π/3 θ), iwThe operation of=Iam × cos (θ), can calculate
The electric current i of U phase and V phaseu、iv。
In addition, above-mentioned converter section 10 is configured in order U phase branch line 14u, V phase branch line 14v and W phase from 2 side of DC power supply
Branch line 14w, but converter section 10 is not limited to the configuration.For example, can also successively match from 2 side of DC power supply in converter section 10
Set W phase branch line 14w, V phase branch line 14v and U phase branch line 14u.In this case, the configuration of portion 17 can be will test in V phase branch line
Between 14v and U phase branch line 14u, so that it detects the electric current flowed through in connecting line 15 or connecting line 16.
[processing of 6. control units 20]
Figure 12 is the flow chart for showing the process of the processing carried out by control unit 20.Processing is in carrier wave shown in Figure 12
The timing of the wave crest or trough of Sc passes through the processing that control unit 20 executes repeatedly.
As shown in figure 12, control unit 20 obtains the detection electric current i of test section 17o, detect the electric current (step an of phase
S11), from the detection electric current i of acquisitionoCalculate the electric current (step S12) of remaining two-phase.For example, in the detection electricity of test section 17
Flow ioFor phase current iuIn the case where, control unit 20 is from phase current iuCalculate phase current ivWith phase current iw。
Then, control unit 20 is by using phase current iu、iv、iwFeedback control update voltage instruction vu *、vv *、vw *
(step S13).Control unit 20 is based on voltage instruction vu *、vv *、vw *Pwm signal So is generated, converter section 10 is controlled.
In the above-described embodiment, it is illustrated for there is three-phase bridge circuit 11 in converter section 10, still
Or with the composition of full-bridge circuit in converter section.Figure 13 is its for showing power inverter 1 shown in embodiment
The figure of his configuration example.
Power inverter 1A shown in Figure 13 includes converter section 10A and control unit 20A, and control unit 20A controls converter section
10A, so that direct current power is converted into single-phase AC power and exports AC power from converter section 10A by it.
Converter section 10A includes full-bridge circuit 11A and capacitor C1.Full-bridge circuit 11A include two branch lines 14a, 14b (with
Under, sometimes referred to as branch line 14).Branch line 14a includes a pair of switches element Swap, the Swan being connected in series, and branch line 14b includes string
Join a pair of switches element Swbp, Swbn of connection.
Test section 17 configures between two branch lines 14, detects the electricity for the connecting line 16 for being connected in parallel two branch lines 14
Stream.Control unit 20A can be detected by test section 17 from converter section in the state that converter section 10A exports zero vector as a result,
The single-phase alternating current of 10A output.
In the above-described embodiment, direct current power or AC power are converted into desired exchange by power inverter 1
Electric power and export, but it is also possible to: for example, DC power supply 2 is substituted for DC load, and motor 3 is substituted for alternating current
Source (for example, generator or electric system etc.).In this case, the control unit 20 of power inverter 1 controls converter section 10,
So that it is exported by the electrical power conversion provided from AC power source at direct current power and to DC load.
Even if in this case, test section 17 also can be in the state of exporting zero vector from multiple branch lines 14, base
It is defeated from AC power source to detect in the electric current flowed through in the connecting line 15 (or connecting line 16) for being connected in parallel multiple branch lines 14
Enter the electric current to a branch line 14.It is adjusted such as the pulse width not to switching mode as a result, it will be able to carry out electric current
Detection.
It as described above, power inverter 1 is respectively provided with multiple switch element Sw, and include: to be connected in parallel with each other
Multiple branch lines 14 (an example of the first branch line and the second branch line), detection are in the connecting line 15 for being connected in parallel multiple branch lines 14 or even
The test section 17 of the electric current flowed through in wiring 16.Thereby, it is possible in the output interval detection of the vector comprising zero vector and branch line
14 corresponding electric currents, therefore even if also can easily be done current detecting in the case where the width of switching pulse is small.
In addition, multiple branch lines 14 include U phase branch line 14u, V phase branch line 14v and W phase branch line 14w (the first branch line, second
An example of line, third branch line), these branch lines 14 from the DC side for being connected to converter section 10 DC bus 12,13 sides are with U
Phase branch line 14u, V phase branch line 14v, W phase branch line 14w's is arranged in order.As a result, in the electric power for the electrical power conversion for carrying out three-phase alternating current
In conversion equipment 1, even if in the case that the width of the switching pulse based on switch element Sw is small, can also be easy to carry out electric current inspection
It surveys.
In addition, power inverter 1 includes reckoning portion 21, reckoning portion 21 is pushed away based on the electric current detected by test section 17
Calculate the electric current flowed through in two branch lines 14 (for example, branch line 14v, 14w) in three branch lines 14u, 14v, 14w.Test section 17
Detect the electric current flowed through in remaining branch line 14 (for example, branch line 14u) among three branch lines 14u, 14v, 14w.By
This, can rest in the electric current flowed through in three branch lines 14u, 14v, 14w based on the electric current detected by test section 17.
In addition, in the state of exporting zero vector from three branch lines 14u, 14v, 14w, test section 17 is based on by three branch
The electric current that flows through in the connecting line 16 or connecting line 15 that two branch lines 14 among line 14u, 14v, 14w are connected in parallel detects
The electric current (for example, branch line 14u) flowed through in one branch line 14.It is flowed through as a result, due to that can be detected in the output interval of zero vector
The electric current of branch line, thus, for example not being adjusted to pulse width of switching mode etc., it will be able to carry out current detecting.
In addition, test section 17 has at least one of shunt resistance 18, Hall element, current transformer.Test section 17
Such as with shunt resistance 18, therefore it can reduce cost.
In addition, above-mentioned converter section 10 is the composition for having a test section 17, but also can be set on converter section 10 more
A test section 17.For example, test section 17 can be respectively set in converter section 10 with position shown in Fig. 7 in the position shown in the figure 1, or
Test section 17 is respectively set in person, position shown in Fig. 9 and position shown in Fig. 10.
In this case, timing determination portion 41 using the timing of the wave crest of carrier wave Sc and trough as obtain timing,
Act A/D converter section 40.Control unit 20 can be in detection of the timing to test section 17 of the wave crest and trough of carrier wave Sc as a result,
Electric current ioIt is detected.
In addition, in the above-described embodiment, be illustrated for generating pwm signal So by carrier wave comparison method,
But pwm signal So can also be generated by means of space vector representation.In this case, power inverter 1 is from converter section 10
When exporting zero vector, current detecting can easily be done by test section 17.
In this way, power inverter 1 includes " converter section with multiple switch element " and " exports from the converter section
In the state of zero vector, the output electric current of the converter section and the unit of at least one of input current are detected ".Converter section 10 is
One example of " converter section with multiple switch element ", test section 17 and control unit 20 are " from converter section output zero
In the state of vector, detect the output electric current of the converter section and the unit of at least one of input current " an example.This
Outside, output electric current be from converter section 10 to AC load (for example, motor 3) provide electric power when flow through converter section 10 and exchange bear
Electric current between lotus.In addition, input current is provided from AC power source (for example, generator or electric system etc.) to converter section 10
The electric current between converter section 10 and AC power source is flowed through when electric power.
Those skilled in the art can easily export further effect and variation.Therefore, it is of the invention more extensively
Mode, be not limited to it is illustrated above and explanation specific details and representative embodiment.Therefore, can not depart from it is logical
In the case where the objective or range of the concept for the recapitulative invention for crossing appended claims and its equivalent to define, into
The various changes of row.
[symbol description]
1,1A power inverter
2 DC power supplies
3 motor
10,10A converter section
11 three-phase bridge circuits
11A full-bridge circuit
12,13 DC bus
14,14u, 14v, 14w, 14a, 14b branch line
15,16 connecting line
17 test sections
18 shunt resistances
19 amplifying circuits
20,20A control unit
21 reckoning portions.
Claims (4)
1. a kind of power inverter, which is characterized in that including converter section, the converter section includes:
Three branch lines, three branch lines are respectively provided with multiple switch element, and three branch lines are connected in parallel with each other；
Test section, the test section detection are flowed through in the connecting line for being connected in parallel any two among three branch lines
Electric current；And
Reckoning portion, the reckoning portion are calculated based on the electric current flowed through in the branch line detected by the test section described
The electric current flowed through in remaining branch line among three branch lines,
The test section is in the state of exporting zero vector from the converter section, based on will be any among three branch lines
The electric current flowed through in two connecting lines being connected in parallel detects the electricity flowed through in a branch line among described two branch lines
Stream.
2. power inverter according to claim 1, which is characterized in that
Three branch lines include the first branch line, the second branch line and third branch line,
First branch line, second branch line, the direct current of the third branch line from the DC side for being connected to the converter section are female
Line side is arranged in order with first branch line, second branch line, the third branch line,
The test section detects the electric current flowed through in the connecting line for being connected in parallel first branch line and second branch line,
Or the electric current flowed through in the connecting line for being connected in parallel second branch line and the third branch line.
3. power inverter according to claim 1, which is characterized in that
The test section is at least either in shunt resistance, Hall element, current transformer.
4. a kind of electric current detecting method characterized by comprising
Output electric current is exported from converter section, wherein the converter section includes three branch lines, and three branch lines are respectively provided with multiple
Switch element, and three branch lines are connected in parallel with each other；
In the state that the output electric current of converter section output is zero vector, based on by any two in three branch lines
The electric current flowed through in a connecting line being connected in parallel detects the electric current flowed through in a branch line in described two branch lines；With
And
The electric current flowed through in a branch line based on the detection, reckoning are flowed through in remaining branch line among three branch lines
Electric current.
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|---|---|---|---|
| JP2015-115186 | 2015-06-05 | ||
| JP2015115186A JP6372424B2 (en) | 2015-06-05 | 2015-06-05 | Power converter and current detection method |
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| CN106253730B true CN106253730B (en) | 2019-10-11 |
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| JP2018207686A (en) * | 2017-06-06 | 2018-12-27 | 富士電機株式会社 | Control circuit for power converter and power conversion device |
| CN110361588A (en) * | 2019-08-08 | 2019-10-22 | 浙江工业大学 | The electric current detecting method of permanent magnet synchronous motor in a kind of motorcar electric compressor |
| CN112422005A (en) * | 2020-11-11 | 2021-02-26 | 潍柴动力股份有限公司 | PI regulator for inhibiting overshoot and control method |
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| ES2425988T3 (en) * | 2001-09-29 | 2013-10-18 | Daikin Industries, Ltd. | Procedure for detecting phase current, inverter control procedure, motor control procedure and devices used in these procedures |
| JP4383942B2 (en) * | 2004-03-31 | 2009-12-16 | 三菱電機株式会社 | Induction heating cooker |
| JP2008253008A (en) * | 2007-03-29 | 2008-10-16 | Mitsubishi Electric Corp | Power converter and method for deciding incorrect connection of power supply |
| JP2009055748A (en) * | 2007-08-29 | 2009-03-12 | Sanyo Electric Co Ltd | Current detector unit and motor control device |
| CN102460934B (en) * | 2009-06-08 | 2014-10-15 | 三菱电机株式会社 | Power converter |
| JP2011125107A (en) * | 2009-12-09 | 2011-06-23 | Sanyo Electric Co Ltd | Motor control device, motor drive system, and inverter control device |
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| CN106253730A (en) | 2016-12-21 |
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