CN104155564B - Brushless direct-current motor inverter single tube open-circuit fault diagnosing and positioning method - Google Patents
Brushless direct-current motor inverter single tube open-circuit fault diagnosing and positioning method Download PDFInfo
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Abstract
The invention discloses a kind of diagnosis of brshless DC motor inverter single tube open-circuit fault and localization methods, Step 1: the real-time acquisition and transmission of brshless DC motor work phase voltage; Step 2: whether the inverter bridge leg for judging that brshless DC motor work phase is connected has occurred open-circuit fault: step 201, the processor are according to formula
The theoretical voltage signal Vj that j phase is calculated is theoretical, the measurement voltage signal Vj of j phase is measured and is compared with the theoretical voltage signal Vj theory of j phase by step 202, the processor, and whether the inverter bridge leg for judging that brshless DC motor work phase j phase is connected has open-circuit fault; Step 3: the insulated gate bipolar transistor of open-circuit fault has occurred on positioning inverter bridge leg. The method of the present invention step is simple, and it is convenient to realize, versatile, high reliablity.
Description
Technical field
The invention belongs to inverter technology field is and in particular to a kind of brshless DC motor inverter single tube open fault
Diagnosis and localization method.
Background technology
The advantages of brshless DC motor is so that it is lightweight, small volume, efficiency high, response are fast, is widely applied.In boat
Empty space flight and armament systems field, due to the particularity of its application scenario, safety and reliability is particularly important, and faults-tolerant control becomes
For research emphasis.And fault diagnosis is basis and the key of faults-tolerant control, therefore, the fault diagnosis side of research brshless DC motor
Method is significant to the reliability improving motor and its drive system.
In prior art, there is the document that brshless DC motor power inverter single tube open fault is diagnosed, for example
Author Li Wenzhuo, room build up and Li Haitao, and the paper delivered on the 33rd phase Proceedings of the CSEE in 2013 is " based on buck
The brshless DC motor power inverter single tube open fault diagnosis of changer pressure regulation ", by analyzing motor under fault mode
Working condition, is sampled to DC bus current using single current sensor, combines with 6 working conditions of motor, real
Detection and the identification of single tube open fault are showed.Also the open fault to BLDCM Drive System inverter is had to examine
Disconnected document, such as author Wang Qiang, Wang Youren, Zhang Zifu etc., delivered on the 33rd phase Proceedings of the CSEE in 2013
Paper " the open fault diagnosis of BLDCM Drive System inverter ", for upper brachium pontis pwm modulation, the normally opened tune of lower brachium pontis
Inverter open fault under mode processed, by analyze inverter turn under normal work with open fault two states around
The line voltage of group, the malfunction under comprehensive two neighboring mode of operation positions specific open switch pipe.But, prior art
In specific buck converter pressure regulation is confined to the diagnosis of brshless DC motor inverter single tube open fault and localization method
Drive or the lower normally opened modulation system of brachium pontis of upper brachium pontis pwm modulation, its versatility is not strong.
Content of the invention
The technical problem to be solved is, for above-mentioned deficiency of the prior art, to provide a kind of brushless direct-current
The diagnosis of motor inverter single tube open fault and localization method, its method and step is simple, and it is convenient to realize, and highly versatile is reliable
Property high.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of brshless DC motor inverter single tube
The diagnosis of open fault and localization method, described inverter includes the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge
Arm, described first inverter bridge leg is by brachium pontis igbt t on first connecting1With first time brachium pontis insulated gate bipolar
Transistor t4Composition, described second inverter bridge leg is by brachium pontis igbt t on second connecting3With second time brachium pontis
Igbt t6Composition, described 3rd inverter bridge leg is by brachium pontis igbt t on the 3rd connecting5With
The three times brachium pontis igbt t2Composition, the on a phase of described brshless DC motor and described first inverter bridge leg
Brachium pontis igbt t on one1With first time brachium pontis igbt t4Connection end connect, described brushless
Brachium pontis igbt t on second in the b phase of direct current generator and described second inverter bridge leg3Insulate with second time brachium pontis
Grid bipolar transistor t6Connection end connect, the 3rd on the c phase of described brshless DC motor and described 3rd inverter bridge leg on bridge
Arm igbt t5With the three times brachium pontis igbt t2Connection end connect；It is characterized in that the party
Method comprises the following steps:
Step one, the Real-time Collection of brshless DC motor work phase voltage and transmission: voltage detector is to brushless dc
The voltage of machine work phase j phase carries out real-time detection measurement voltage signal v by detected j phaseJ measuresExport to processor,
Described processor is connected with voltage detector；Wherein, the value of j is a, b or c；
Step 2, judge whether the brshless DC motor inverter bridge leg that connected of phase that works there occurs open fault, specifically
Process is:
Step 201, described processor are according to formulaIt is calculated the theoretical voltage of j phase
Signal vJ is theoretical；Wherein, chThe upper brachium pontis insulated gate bipolar on inverter bridge leg being connected by brshless DC motor work phase j phase is brilliant
The control signal of body pipe, and chValue be 1 or 0, ch=1 is the inverter bridge controlling brshless DC motor work phase j phase to be connected
Upper brachium pontis igbt conducting on arm, ch=0 is the inversion controlling brshless DC motor work phase j phase to be connected
Upper brachium pontis igbt on brachium pontis turns off；For chLogical inversion；clFor brshless DC motor work phase j phase
The control signal of the lower brachium pontis igbt on the inverter bridge leg being connected, and clValue be 1 or 0, cl=1 is
Lower brachium pontis igbt conducting on the inverter bridge leg that control brshless DC motor work phase j phase is connected, cl=0
The lower brachium pontis igbt on inverter bridge leg being connected by control brshless DC motor work phase j phase turns off；For clLogical inversion；shThe upper brachium pontis insulated gate bipolar on inverter bridge leg being connected by brshless DC motor work phase j phase
The operation interval signal of transistor, and shValue be 1 or 0, sh=1 inversion being connected by brshless DC motor work phase j phase
120 ° of intervals of the upper brachium pontis igbt work on brachium pontis, sh=0 is connected by brshless DC motor work phase j phase
The idle interval of upper brachium pontis igbt on the inverter bridge leg connecing；slFor brshless DC motor work phase j phase
The operation interval signal of the lower brachium pontis igbt on the inverter bridge leg being connected, and slValue be 1 or 0, sl=
120 ° of lower brachium pontis igbt work on 1 inverter bridge leg being connected by brshless DC motor work phase j phase
Interval, slLower brachium pontis igbt on=0 inverter bridge leg being connected by brshless DC motor work phase j phase is not
The interval of work；The direct current power source voltage that e is connected by described inverter；
Step 202, described processor are by measurement voltage signal v of j phaseJ measuresTheoretical voltage signal v with j phaseJ is theoreticalCompared
Relatively, as | vJ measures-vJ is theoretical| during≤ε, it is judged as that the inverter bridge leg no open fault that brshless DC motor work phase j phase is connected is sent out
Raw, return to step one；When | vJ measures-vJ is theoretical| > ε when, be judged as that the brshless DC motor inverter bridge leg that connected of phase j phase that works is sent out
Open fault, execution step three are given birth to；Wherein, ε is voltage measurement error；
The igbt of open fault be there occurs on step 3, positioning inverter bridge leg: when the first inverter bridge leg
When there occurs open fault, described processor is according to formulaAnd formulaCalculate
Brachium pontis igbt t on first1Working condition f1With first time brachium pontis igbt t4Work shape
State f4, and according to f1And f4Result of calculation position the igbt of open fault be there occurs on the first inverter bridge leg；
Work as f1When=1, it is judged as brachium pontis igbt t on first1There occurs open fault；Work as f4When=1, it is judged as
Brachium pontis igbt t once4There occurs open fault；
When the second inverter bridge leg there occurs open fault, described processor is according to formulaAnd public affairs
FormulaCalculate brachium pontis igbt t on second3Working condition f3Insulate with second time brachium pontis
Grid bipolar transistor t6Working condition f6, and according to f3And f6Result of calculation position the second inverter bridge leg on there occurs open circuit
The igbt of fault；Work as f3When=1, it is judged as brachium pontis igbt t on second3There occurs open circuit
Fault；Work as f6When=1, it is judged as second time brachium pontis igbt t6There occurs open fault；
When the 3rd inverter bridge leg there occurs open fault, described processor is according to formulaAnd public affairs
FormulaCalculate brachium pontis igbt t on the 3rd5Working condition f5Insulate with the three times brachium pontis
Grid bipolar transistor t2Working condition f2, and according to f5And f2Result of calculation position the 3rd inverter bridge leg on there occurs open circuit
The igbt of fault；Work as f5When=1, it is judged as brachium pontis igbt t on the 3rd5There occurs open circuit
Fault；Work as f2When=1, it is judged as the three times brachium pontis igbt t2There occurs open fault；
Wherein, ciFor igbt tiControl signal, and ciValue be 1 or 0, ci=1 is to control insulation
Grid bipolar transistor tiConducting, ci=0 is to control igbt tiTurn off；For ciLogical inversion；siFor insulated gate
Bipolar transistor tiOperation interval signal, and siValue be 1 or 0, si=1 is igbt tiWork
120 ° of intervals, si=0 is igbt tiIdle interval；fionFor ciIgbt t when=1i
Working condition, and fionValue be 1 or 0, fion=1 is ciIgbt t when=1iIt is in open fault shape
State, fion=0 is ciIgbt t when=1iIt is in normally state；I is 1～6 natural number.
The above-mentioned diagnosis of brshless DC motor inverter single tube open fault and localization method it is characterised in that: described
Brachium pontis igbt t on first1By antiparallel igbt q1With diode d1Composition, described the
Brachium pontis igbt t once4By antiparallel igbt q4With diode d4Composition, described second
Upper brachium pontis igbt t3By antiparallel igbt q3With diode d3Composition, under described second
Brachium pontis igbt t6By antiparallel igbt q6With diode d6Composition, bridge on the described 3rd
Arm igbt t5By antiparallel igbt q5With diode d5Composition, described the three times brachium pontis
Igbt t2By antiparallel igbt q2With diode d2Composition.
The above-mentioned diagnosis of brshless DC motor inverter single tube open fault and localization method it is characterised in that: step
In 202, the value of ε is 0.5v～1v.
The present invention compared with prior art has the advantage that
1st, the present invention achieves the detection of single tube open fault using the method for simple inverter output end voltage detecting
With identification, simply, it is convenient to realize for method and step.
2nd, compared with prior art, versatility of the present invention is higher, can more reliably navigate to and there occurs open fault
Switching tube.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description
Fig. 1 is the circuit connecting relation schematic diagram of inverter of the present invention and brshless DC motor.
Fig. 2 is method of the present invention FB(flow block).
When Fig. 3 a is upper pipe modulation, down tube Heng Tong modulation system, brachium pontis igbt t on t=20ms first1
There occurs simulation waveform during open fault.
When Fig. 3 b is for down tube modulation, upper pipe Heng Tong modulation system, brachium pontis igbt t on t=30ms first1
There occurs simulation waveform during open fault.
When Fig. 4 a is upper pipe modulation, down tube Heng Tong modulation system, first time brachium pontis igbt t of t=25ms4
There occurs simulation waveform during open fault.
When Fig. 4 b is for down tube modulation, upper pipe Heng Tong modulation system, first time brachium pontis igbt t of t=30ms4
There occurs simulation waveform during open fault.
Description of reference numerals:
1 brshless DC motor.
Specific embodiment
As depicted in figs. 1 and 2, the diagnosis of brshless DC motor inverter single tube open fault of the present invention and positioning side
Method, described inverter includes the first inverter bridge leg, the second inverter bridge leg and the 3rd inverter bridge leg, and described first inverter bridge leg is by going here and there
Brachium pontis igbt t on the first of connection1With first time brachium pontis igbt t4Composition, described second is inverse
Become brachium pontis by brachium pontis igbt t on second connecting3With second time brachium pontis igbt t6Composition,
Described 3rd inverter bridge leg is by brachium pontis igbt t on the 3rd connecting5Brilliant with the three times brachium pontis insulated gate bipolars
Body pipe t2Brachium pontis insulated gate bipolar transistor on first on composition, a phase of described brshless DC motor and described first inverter bridge leg
Pipe t1With first time brachium pontis igbt t4Connection end connect, the b phase of described brshless DC motor and described second
Brachium pontis igbt t on second on inverter bridge leg3With second time brachium pontis igbt t6Connection end phase
Connect, the 3rd on the c phase of described brshless DC motor and described 3rd inverter bridge leg on brachium pontis igbt t5With
Three times brachium pontis igbt t2Connection end connect；The method comprises the following steps:
Step one, the Real-time Collection of brshless DC motor work phase voltage and transmission: voltage detector is to brushless dc
The voltage of machine work phase j phase carries out real-time detection measurement voltage signal v by detected j phaseJ measuresExport to processor,
Described processor is connected with voltage detector；Wherein, the value of j is a, b or c；
Step 2, judge whether the brshless DC motor inverter bridge leg that connected of phase that works there occurs open fault, specifically
Process is:
Step 201, described processor are according to formulaIt is calculated the theoretical voltage of j phase
Signal vJ is theoretical；Wherein, chThe upper brachium pontis insulated gate bipolar on inverter bridge leg being connected by brshless DC motor work phase j phase is brilliant
The control signal of body pipe, and chValue be 1 or 0, ch=1 is the inverter bridge controlling brshless DC motor work phase j phase to be connected
Upper brachium pontis igbt conducting on arm, ch=0 is the inversion controlling brshless DC motor work phase j phase to be connected
Upper brachium pontis igbt on brachium pontis turns off；For chLogical inversion；clFor brshless DC motor work phase j phase
The control signal of the lower brachium pontis igbt on the inverter bridge leg being connected, and clValue be 1 or 0, cl=1 is
Lower brachium pontis igbt conducting on the inverter bridge leg that control brshless DC motor work phase j phase is connected, cl=0
The lower brachium pontis igbt on inverter bridge leg being connected by control brshless DC motor work phase j phase turns off；
For clLogical inversion；shThe upper brachium pontis insulated gate bipolar transistor on inverter bridge leg being connected by brshless DC motor work phase j phase
The operation interval signal of pipe, and shValue be 1 or 0, sh=1 inverter bridge leg being connected by brshless DC motor work phase j phase
On the work of upper brachium pontis igbt 120 ° of intervals, sh=0 works what phase j phase was connected by brshless DC motor
The idle interval of upper brachium pontis igbt on inverter bridge leg；slConnected by brshless DC motor work phase j phase
The operation interval signal of the lower brachium pontis igbt on the inverter bridge leg connecing, and slValue be 1 or 0, sl=1 is
120 ° of areas of the lower brachium pontis igbt work on the inverter bridge leg that brshless DC motor work phase j phase is connected
Between, slLower brachium pontis igbt not work on=0 inverter bridge leg being connected by brshless DC motor work phase j phase
The interval made；The direct current power source voltage that e is connected by described inverter；
Step 202, described processor are by measurement voltage signal v of j phaseJ measuresTheoretical voltage signal v with j phaseJ is theoreticalCompared
Relatively, as | vJ measures-vJ is theoretical| during≤ε, it is judged as that the inverter bridge leg no open fault that brshless DC motor work phase j phase is connected is sent out
Raw, return to step one；When | vJ measures-vJ is theoretical| > ε when, be judged as that the brshless DC motor inverter bridge leg that connected of phase j phase that works is sent out
Open fault, execution step three are given birth to；Wherein, ε is voltage measurement error；
The igbt of open fault be there occurs on step 3, positioning inverter bridge leg: when the first inverter bridge leg
When there occurs open fault, described processor is according to formulaAnd formulaCalculate
Brachium pontis igbt t on first1Working condition f1With first time brachium pontis igbt t4Work shape
State f4, and according to f1And f4Result of calculation position the igbt of open fault be there occurs on the first inverter bridge leg；
Work as f1When=1, it is judged as brachium pontis igbt t on first1There occurs open fault；Work as f4When=1, it is judged as
Brachium pontis igbt t once4There occurs open fault；
When the second inverter bridge leg there occurs open fault, described processor is according to formulaAnd public affairs
FormulaCalculate brachium pontis igbt t on second3Working condition f3Insulate with second time brachium pontis
Grid bipolar transistor t6Working condition f6, and according to f3And f6Result of calculation position the second inverter bridge leg on there occurs open circuit
The igbt of fault；Work as f3When=1, it is judged as brachium pontis igbt t on second3There occurs open circuit
Fault；Work as f6When=1, it is judged as second time brachium pontis igbt t6There occurs open fault；
When the 3rd inverter bridge leg there occurs open fault, described processor is according to formulaAnd public affairs
FormulaCalculate brachium pontis igbt t on the 3rd5Working condition f5Insulate with the three times brachium pontis
Grid bipolar transistor t2Working condition f2, and according to f5And f2Result of calculation position the 3rd inverter bridge leg on there occurs open circuit
The igbt of fault；Work as f5When=1, it is judged as brachium pontis igbt t on the 3rd5There occurs open circuit
Fault；Work as f2When=1, it is judged as the three times brachium pontis igbt t2There occurs open fault；
Wherein, ciFor igbt tiControl signal, and ciValue be 1 or 0, ci=1 is to control insulation
Grid bipolar transistor tiConducting, ci=0 is to control igbt tiTurn off；For ciLogical inversion；siFor insulated gate
Bipolar transistor tiOperation interval signal, and siValue be 1 or 0, si=1 is igbt tiWork
120 ° of intervals, si=0 is igbt tiIdle interval；fionFor ciIgbt t when=1i
Working condition, and fionValue be 1 or 0, fion=1 is ciIgbt t when=1iIt is in open fault shape
State, fion=0 is ciIgbt t when=1iIt is in normally state；I is 1～6 natural number.
In the present embodiment, brachium pontis igbt t on described first1By antiparallel igbt
q1With diode d1Composition, described first time brachium pontis igbt t4By antiparallel igbt q4
With diode d4Composition, brachium pontis igbt t on described second3By antiparallel igbt q3With
Diode d3Composition, described second time brachium pontis igbt t6By antiparallel igbt q6With two
Pole pipe d6Composition, brachium pontis igbt t on the described 3rd5By antiparallel igbt q5With two poles
Pipe d5Composition, described the three times brachium pontis igbt t2By antiparallel igbt q2And diode
d2Composition.
In the present embodiment, in step 202, the value of ε is 0.5v～1v.
In order to verify the diagnosis carrying out brshless DC motor inverter single tube open fault using method of the present invention
With the effect of positioning, method of the present invention is emulated, the parameter of the brshless DC motor that emulation is chosen is: every phase
Resistance 11.9 ω, every phase inductance 2.07mh, number of pole-pairs is 2, is operated in 120 degree of conduction modes；The ginseng of the inverter that emulation is chosen
Number is the direct current power source voltage 300v that inverter is connected, carrier frequency 10khz.
When upper pipe modulation, down tube Heng Tong (hpwm_lon) modulation system, brachium pontis insulated gate bipolar transistor on t=20ms first
Pipe t1There occurs simulation waveform during open fault as shown in Figure 3 a；Down tube modulation, upper pipe Heng Tong (hon_lpwm) modulation system
When, brachium pontis igbt t on t=30ms first1There occurs simulation waveform during open fault as shown in Figure 3 b；Figure
In 3a and Fig. 3 b, t is the time, iaFor brshless DC motor a phase current, ibFor brshless DC motor b phase current, icFor brushless straight
Stream motor c phase current, vA measuresFor (s1+s4The measurement voltage signal of a phase that the operation interval voltage detector of)=1 detects,
vA is theoreticalFor (s1+s4Described in the operation interval of)=1, processor is according to formulaIt is calculated a phase
Theoretical voltage signal, f1For brachium pontis igbt t on first1Working condition, f4For first time brachium pontis insulated gate
Bipolar transistor t4Working condition；From Fig. 3 a and Fig. 3 b, upper pipe modulation, down tube Heng Tong (hpwm_lon) and down tube are adjusted
Under system, two kinds of modulation systems of upper pipe Heng Tong (hon_lpwm), it is first that method of the present invention can quickly locate
Upper brachium pontis igbt t1There occurs fault.
When upper pipe modulation, down tube Heng Tong (hpwm_lon) modulation system, first time brachium pontis insulated gate bipolar transistor of t=25ms
Pipe t4There occurs simulation waveform during open fault as shown in fig. 4 a；Down tube modulation, upper pipe Heng Tong (hon_lpwm) modulation system
When, first time brachium pontis igbt t of t=30ms4There occurs simulation waveform during open fault as shown in Figure 4 b；Figure
In 4a and Fig. 4 b, iaFor brshless DC motor a phase current, ibFor brshless DC motor b phase current, icFor brshless DC motor c phase
Electric current, vA measuresFor (s1+s4The measurement voltage signal of a phase that the operation interval voltage detector of)=1 detects, vA is theoreticalFor (s1+
s4Described in the operation interval of)=1, processor is according to formulaIt is calculated the theoretical voltage of a phase
Signal, f1For brachium pontis igbt t on first1Working condition, f4For first time brachium pontis igbt
t4Working condition；From Fig. 4 a and Fig. 4 b, upper pipe modulation, down tube Heng Tong (hpwm_lon) and down tube modulation, upper pipe Heng Tong
(hon_lpwm), under two kinds of modulation systems, it is first time brachium pontis insulated gate that method of the present invention can quickly locate
Bipolar transistor t4There occurs fault.
It is more than the Driven by inverter being formed as switching device using conventional employing igbt (igbt)
In case of brshless DC motor, the method for the present invention is illustrated；The method of the present invention, is equally applicable to using gold
Belong to the situation of the Driven by inverter brshless DC motor that oxide semiconductor field effect pipe (mosfet) forms as switching device.
The above, be only presently preferred embodiments of the present invention, not the present invention imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, all still fall within skill of the present invention
In the protection domain of art scheme.
Claims (3)
1. a kind of diagnosis of brshless DC motor inverter single tube open fault and localization method, it is inverse that described inverter includes first
Become brachium pontis, the second inverter bridge leg and the 3rd inverter bridge leg, described first inverter bridge leg is double by brachium pontis insulated gate on first connecting
Gated transistors t1With first time brachium pontis igbt t4Composition, described second inverter bridge leg is by bridge on second connecting
Arm igbt t3With second time brachium pontis igbt t6Composition, described 3rd inverter bridge leg is by connecting
The 3rd on brachium pontis igbt t5With the three times brachium pontis igbt t2Composition, described brushless direct-current
Brachium pontis igbt t on first in a phase of motor and described first inverter bridge leg1Double with first time brachium pontis insulated gate
Gated transistors t4Connection end connect, second on the b phase of described brshless DC motor and described second inverter bridge leg on brachium pontis exhausted
Edge grid bipolar transistor t3With second time brachium pontis igbt t6Connection end connect, the c of described brshless DC motor
With the 3rd on described 3rd inverter bridge leg on brachium pontis igbt t5With the three times brachium pontis insulated gate bipolar transistors
Pipe t2Connection end connect；It is characterized in that the method comprises the following steps:
Step one, the Real-time Collection of brshless DC motor work phase voltage and transmission: voltage detector is to brshless DC motor work
The voltage making phase j phase carries out real-time detection measurement voltage signal v by detected j phaseJ measuresExport to processor, described
Processor is connected with voltage detector；Wherein, the value of j is a, b or c；
Step 2, judge whether the brshless DC motor inverter bridge leg that connected of phase that works there occurs open fault, detailed process
For:
Step 201, described processor are according to formulaIt is calculated the theoretical voltage signal of j phase
vJ is theoretical；Wherein, chThe upper brachium pontis igbt on inverter bridge leg being connected by brshless DC motor work phase j phase
Control signal, and chValue be 1 or 0, chOn=1 inverter bridge leg being connected by control brshless DC motor work phase j phase
The conducting of upper brachium pontis igbt, ch=0 is the inverter bridge leg controlling brshless DC motor work phase j phase to be connected
On upper brachium pontis igbt turn off；For chLogical inversion；clConnected by brshless DC motor work phase j phase
The control signal of the lower brachium pontis igbt on the inverter bridge leg connecing, and clValue be 1 or 0, cl=1 is to control
Lower brachium pontis igbt conducting on the inverter bridge leg that brshless DC motor work phase j phase is connected, cl=0 is control
The lower brachium pontis igbt on inverter bridge leg that brshless DC motor work phase j phase processed is connected turns off；For cl
Logical inversion；shThe upper brachium pontis igbt on inverter bridge leg being connected by brshless DC motor work phase j phase
Operation interval signal, and shValue be 1 or 0, shOn=1 inverter bridge leg being connected by brshless DC motor work phase j phase
The work of upper brachium pontis igbt 120 ° of intervals, sh=0 by brshless DC motor work phase j phase connected inverse
Become the idle interval of upper brachium pontis igbt on brachium pontis；slConnected by brshless DC motor work phase j phase
Inverter bridge leg on lower brachium pontis igbt operation interval signal, and slValue be 1 or 0, sl=1 is no
120 ° of intervals of the lower brachium pontis igbt work on the inverter bridge leg that brushless motor work phase j phase is connected,
slLower brachium pontis igbt on=0 inverter bridge leg being connected by brshless DC motor work phase j phase does not work
Interval；The direct current power source voltage that e is connected by described inverter；
Step 202, described processor are by measurement voltage signal v of j phaseJ measuresTheoretical voltage signal v with j phaseJ is theoreticalIt is compared,
When | vJ measures-vJ is theoretical| during≤ε, it is judged as that the inverter bridge leg no open fault that brshless DC motor work phase j phase is connected occurs,
Return to step one；When | vJ measures-vJ is theoretical| > ε when, be judged as that the brshless DC motor inverter bridge leg that connected of phase j phase that works there occurs
Open fault, execution step three；Wherein, ε is voltage measurement error；
The igbt of open fault be there occurs on step 3, positioning inverter bridge leg: when the first inverter bridge leg occurs
During open fault, described processor is according to formulaAnd formulaCalculate first
Upper brachium pontis igbt t1Working condition f1With first time brachium pontis igbt t4Working condition
f4, and according to f1And f4Result of calculation position the igbt of open fault be there occurs on the first inverter bridge leg；When
f1When=1, it is judged as brachium pontis igbt t on first1There occurs open fault；Work as f4When=1, it is judged as first
Lower brachium pontis igbt t4There occurs open fault；
When the second inverter bridge leg there occurs open fault, described processor is according to formulaAnd formulaCalculate brachium pontis igbt t on second3Working condition f3With second time brachium pontis insulated gate
Bipolar transistor t6Working condition f6, and according to f3And f6Result of calculation position the second inverter bridge leg on there occurs open circuit therefore
The igbt of barrier；Work as f3When=1, it is judged as brachium pontis igbt t on second3There occurs open circuit event
Barrier；Work as f6When=1, it is judged as second time brachium pontis igbt t6There occurs open fault；
When the 3rd inverter bridge leg there occurs open fault, described processor is according to formulaAnd formulaCalculate brachium pontis igbt t on the 3rd5Working condition f5With the three times brachium pontis insulated gates
Bipolar transistor t2Working condition f2, and according to f5And f2Result of calculation position the 3rd inverter bridge leg on there occurs open circuit therefore
The igbt of barrier；Work as f5When=1, it is judged as brachium pontis igbt t on the 3rd5There occurs open circuit event
Barrier；Work as f2When=1, it is judged as the three times brachium pontis igbt t2There occurs open fault；
Wherein, ciFor igbt tiControl signal, and ciValue be 1 or 0, ci=1 is to control insulated gate double
Gated transistors tiConducting, ci=0 is to control igbt tiTurn off；For ciLogical inversion；siFor insulated gate bipolar
Transistor tiOperation interval signal, and siValue be 1 or 0, si=1 is igbt ti120 ° of areas of work
Between, si=0 is igbt tiIdle interval；fionFor ciIgbt t when=1iWork
State, and fionValue be 1 or 0, fion=1 is ciIgbt t when=1iIt is in open fault state, fion=
0 is ciIgbt t when=1iIt is in normally state；I is 1～6 natural number.
2., according to diagnosis and the localization method of the brshless DC motor inverter single tube open fault described in claim 1, it is special
Levy and be: brachium pontis igbt t on described first1By antiparallel igbt q1With diode d1
Composition, described first time brachium pontis igbt t4By antiparallel igbt q4With diode d4Group
Become, brachium pontis igbt t on described second3By antiparallel igbt q3With diode d3Composition,
Described second time brachium pontis igbt t6By antiparallel igbt q6With diode d6Composition, institute
State brachium pontis igbt t on the 3rd5By antiparallel igbt q5With diode d5Composition, described
The three times brachium pontis igbt t2By antiparallel igbt q2With diode d2Composition.
3., according to diagnosis and the localization method of the brshless DC motor inverter single tube open fault described in claim 1, it is special
Levy and be: in step 202, the value of ε is 0.5v～1v.
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Denomination of invention: Diagnosis and localization method of single tube open circuit fault in brushless DC motor inverter Granted publication date: 20170125 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: Shaanxi Zhijianmei Technology Co.,Ltd. Registration number: Y2024980022461 |