CN101382585A - Test method, apparatus and generator for inverter in generator - Google Patents
Test method, apparatus and generator for inverter in generator Download PDFInfo
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- CN101382585A CN101382585A CN 200710076925 CN200710076925A CN101382585A CN 101382585 A CN101382585 A CN 101382585A CN 200710076925 CN200710076925 CN 200710076925 CN 200710076925 A CN200710076925 A CN 200710076925A CN 101382585 A CN101382585 A CN 101382585A
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Abstract
The invention is applicable to the automated testing field and provides a test method of an inverter in an electric motor, a device and the electric motor; wherein, the method comprises the following steps: controlling a switching element according to a predetermined switch mechanism of all the switching elements of the inverter; testing an overcurrent alarming signal and determining the shorted out switching element according to the tested overcurrent alarm signal. The invention does not need the hardware to test the shorted out element of the IPM inverter and does not change the structure of the original electric motor; furthermore, the invention adopts a mathematical method to control the switching element, being relatively simple and suitable to be added to the main routine of the electric motor, thus overcoming a series of problems in hardware testing.
Description
Technical field
The invention belongs to the automatic test field, relate in particular to method of testing, device and the motor of inverter in a kind of motor.
Background technology
In the control strategy field of control field, especially electric vehicle and the hybrid vehicle of motor, (Intelligent Power Module, IPM) inverter has very important effect to Intelligent Power Module.The IPM inverter is power device igbt (the Insulated GateBipolar Transistor with high speed, low-power consumption; IGBT) be main, the hydrid integrated circuit module that kinds of protect circuit such as gate drive circuit and overcurrent protection, short-circuit protection, overheating protection, under-voltage protection are integrated simultaneously.
As shown in Figure 1, common IPM inverter 1 comprises power supply 11, electric capacity 12 and IGBT on-off element 13 in parallel.Power supply 11 is a direct supply.Jumbo electrochemical capacitor is used for energy storage in the electric capacity 12, the ripple of filtering DC component; The absorption electric capacity of low capacity is used for the process of cut-offfing with very high frequency at the IPM inverter, absorbing high-frequency component and noise.
IGBT on-off element 13 comprises six IGBT T1 to T6, and each IGBT sustained diode 1 all in parallel is used for IGBT and entire circuit afterflow protection to D6.Wherein T1 connects with T2, forms U phase brachium pontis; T3 connects with T4, forms V phase brachium pontis; T5 connects with T6, forms W phase brachium pontis.T1, T3 and T5 in parallel are also referred to as brachium pontis, and T2, T4 and T6 in parallel are also referred to as down brachium pontis.
In the practical application, IPM inverter 1 in the electric system receives the various command that electric machine controller 8 sends by light-coupled isolation unit 7, U, W two-phase brachium pontis are connected with U, W two phase windings in magneto 6 three phase windings by first current sensor 4 and second current sensor 5 respectively, and the V phase brachium pontis of IPM inverter 1 directly is connected with the V phase winding of magneto 6.Three-phase alternating current electric signal after the direct supply inversion of current sensor 4 and 5 measurement IPM inverters 1, and flow to the foundation of electric machine controller 8 as calculating torque.
Electric machine controller 8 in the circuit shown in Figure 1 is realized speed change by the turn-on and turn-off time of each on-off element of control pulse width modulation duty control IPM inverter 1, forms electric current loop.But; among six IGBT in the three-phase brachium pontis if there is the current value of an IGBT conducting to surpass the limit value of IPM inverter 1 self electric current; design according to hardware itself; IPM inverter 1 will send alarm signal to electric machine controller 8 by light-coupled isolation unit 7 for self-protection; control IGBT stopped to work on after electric machine controller 8 received alarm signal, and this process is called the IPM overcurrent protection.
Therefore the operate as normal of IPM inverter is the safe and reliable prerequisite of motor, needs to guarantee in the IPM inverter that on-off element is not short-circuited and opens circuit.
When the on-off element of IPM inverter is short-circuited and opens circuit, need detect from hardware.Generally detect not only time-consuming, effort, and can not find out the concrete element that the IPM inverter breaks down the very first time, increased the complicacy that detects from hardware.
Therefore, in practice in the past and the present real electrical machinery control procedure, just bring into use after common finished product process detection to the IPM inverter is no problem, only under having appearred in the IPM inverter, the situation of problem just carries out hardware detection, both lost time, consume the man power and material again, increased cost virtually for product development.
Summary of the invention
The object of the present invention is to provide the method for testing of inverter in a kind of motor, be intended to solve a series of problems that prior art utilizes the hardware detection inverter to cause.
The present invention is achieved in that the method for testing of inverter in a kind of motor, comprising: according to the switching mechanism gauge tap element of all on-off elements of predefined inverter; Detect the overcurrent alarm signal, determine the on-off element of short circuit according to detected overcurrent alarm signal.
Another purpose of the present invention is to provide the proving installation of inverter in a kind of motor, comprising: the on-off element control module, be connected with inverter, and be used for switching mechanism gauge tap element according to predefined all on-off elements of inverter; And the short-circuit detecting module, be connected with inverter, be used to detect the overcurrent alarm signal, and determine the on-off element of short circuit according to detected overcurrent alarm signal.
A further object of the present invention is to provide a kind of motor, comprise the inverter proving installation, the inverter proving installation comprises: the on-off element control module, be connected with inverter, and be used for switching mechanism gauge tap element according to predefined all on-off elements of inverter; And the short-circuit detecting module, be connected with inverter, be used to detect the overcurrent alarm signal, and determine the on-off element of short circuit according to detected overcurrent alarm signal.
In the motor provided by the invention in the method for testing of inverter and device and the motor, adopt switching mechanism gauge tap element, testing result according to the overcurrent alarm signal is determined short-circuit component, therefore need not hardware detection, and do not change the original structure of motor, overcome a series of problems that hardware detection may occur.In addition, switching mechanism adopts mathematical method, and is simple relatively but tight, is fit to add in the master routine of motor.
Description of drawings
Fig. 1 is the synoptic diagram of electric system;
The process flow diagram of the method for testing of inverter in Fig. 2 motor of the present invention;
Fig. 3 is the process flow diagram of method for detecting short circuit of the present invention;
Fig. 4 is the process flow diagram of broken circuit detecting method of the present invention; And
Fig. 5 is the block scheme of the proving installation of inverter in the motor of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The method of testing of inverter can be write in the master routine of electric machinery control device in the motor of the present invention, by the on-off element of predefined switching mechanism control inverter, according to definite fault elements such as detected overcurrent alarm signals in the on-off element moving process.
Please refer to Fig. 1 and Fig. 2, the method for testing of inverter realizes test according to following switching mechanism control IPM inverter in the motor of the present invention, specifically comprises the steps:
In step S101, after 8 energisings of the power supply 11 of IPM inverter 1 and electric machine controller, at first judge whether to enter the IPM trace routine, be execution in step S103 then, otherwise finish;
In step S103, carry out short-circuit detecting;
In step S105, return the short-circuit detecting result;
In step S107, whether judgement has the element short circuit, is then to finish, otherwise execution in step S109;
In step S109, carry out the detection of opening circuit, open circuit to detect and on short-circuit detecting result's basis, carry out, if the element short circuit is arranged, then can't carry out the detection of opening circuit;
In step S111, return the testing result that opens circuit.
As shown in Figure 3, below will describe the method for carrying out short-circuit detecting among the step S103 in detail:
In step S1031, send the shutoff order to all on-off element T1 to T6;
In step S1033, judge whether to receive IPM overcurrent alarm signal, be to prove that then upper and lower brachium pontis in the three-phase brachium pontis respectively has the short circuit simultaneously of an on-off element at least, execution in step S105 then, otherwise execution in step S1035;
In step S1035, respectively last brachium pontis on-off element T1, T3, T5 are carried out short-circuit detecting, judged whether the on-off element short circuit, when detecting a certain on-off element short circuit, short-circuit detecting finishes, execution in step S105, execution in step S1037 when not having the on-off element short circuit, the method for detecting short circuit of wherein going up the brachium pontis on-off element is as follows:
Brachium pontis on-off element T1, T3 and T5 in the shutoff, brachium pontis on-off element T2 under the conducting, turn-off brachium pontis on-off element T4 and T6 down, judge whether to receive IPM overcurrent alarm signal, be then to prove T1 short circuit, end of test (EOT), reported result, otherwise not short circuit of proof T1 is removed IPM overcurrent alarm signal so that carry out subsequent detection;
As T1 not during short circuit, turn-off T1, T3 and T5, conducting T4 turn-offs T2 and T6, judges whether to occur IPM overcurrent alarm signal, is then to prove the T3 short circuit, end of test (EOT), reported result, otherwise not short circuit of proof T3 are removed IPM overcurrent alarm signal;
As T3 not during short circuit, turn-off T1, T3 and T5, conducting T6 turn-offs T2 and T4, judges whether to occur IPM overcurrent alarm signal, is then to prove the T5 short circuit, end of test (EOT), reported result, otherwise not short circuit of proof T5 are removed IPM overcurrent alarm signal.
In step S1037, as last brachium pontis on-off element T1, T3, T5 all not during short circuit, detect down whether short circuit of brachium pontis on-off element T2, T4, T6, when detecting a certain on-off element short circuit, short-circuit detecting finishes, and reports testing result, and detection method is as follows:
Turn-off T2, T4 and T6, conducting T1 turn-offs T3 and T5, judges whether to occur IPM overcurrent alarm signal, is then to prove the T2 short circuit, end of test (EOT), and reported result, otherwise not short circuit of proof T2 are removed IPM overcurrent alarm signal;
As T2 not during short circuit, turn-off T2, T4 and T6, conducting T3 turn-offs T1 and T5, judges whether to occur IPM overcurrent alarm signal, is then to prove the T4 short circuit, end of test (EOT), reported result, otherwise not short circuit of proof T4 are removed IPM overcurrent alarm signal;
As T4 not during short circuit, turn-off T2, T4 and T6, conducting T5, turn-offing T1 and T3, judge whether to occur IPM overcurrent alarm signal, is then to prove the T6 short circuit, remove IPM overcurrent alarm signal, otherwise not short circuit of proof T6 is removed IPM overcurrent alarm signal so that open circuit detection.
It is to carry out on the basis of the short-circuit detecting of carrying out in step S103 that opening circuit among the step S109 detected, and can not carry out out of circuit test when having the element short circuit.After electric machine controller 8, motor 6 and 1 energising of IPM inverter, last brachium pontis or down complete the and ground wire of the on-off element of brachium pontis open circuit, the three-phase current of motor 6 all is approximately equal to " 0 ", therefore three-phase current and also be approximately equal to " 0 ", can't operate as normal after the IPM inverter energising, so method of the present invention only detects the IPM inverter that can work, promptly need in the present embodiment to guarantee to have to have at least two IGBT not open circuit, can work simultaneously.As shown in Figure 4, in the testing process of step S109, specifically comprise:
In step S1091, each phase brachium pontis of difference moment conducting three-phase brachium pontis;
In step S1093, judge whether each phase brachium pontis receives IPM overcurrent alarm signal when the moment conducting, be that situation about opening circuit does not all appear in two on-off elements then proving this brachium pontis, direct backtrack test result (execution in step S111), otherwise prove that this phase brachium pontis has at least an on-off element to open circuit execution in step S1093;
In step S1095, in order to find out the on-off element that opens circuit, two on-off elements of brachium pontis and the non-homophase of following brachium pontis in the combination, and control each respectively and make up conducting, whether according to the value of detected phase current after every group of combination conducting is zero to judge that whether the on-off element in the combination opens circuit, and wherein makes up as follows:
1, go up brachium pontis on-off element T1 conducting, turn-off T3 and T5, following brachium pontis on-off element T2 and T6 turn-off, and conducting T4, controller 8 judge whether the current sensor 4 and 5 electric machine phase currents that send that receive are " 0 ", are to prove that then on-off element T1 or T4 open circuit;
2, go up brachium pontis on-off element T1 conducting, turn-off T3 and T5, following brachium pontis on-off element T2 and T4 turn-off, and conducting T6 judges whether the electric machine phase current that receives is " 0 ", is to prove that then on-off element T1 or T6 open circuit;
3, go up brachium pontis on-off element T3 conducting, turn-off T1 and T5, following brachium pontis on-off element T4 and T6 turn-off, and conducting T2 judges whether the electric machine phase current that receives is " 0 ", is to prove that then on-off element T3 or T2 open circuit;
4, go up brachium pontis on-off element T3 conducting, turn-off T1 and T5, following brachium pontis on-off element T4 and T2 turn-off, and conducting T6 judges whether the electric machine phase current that receives is " 0 ", is to prove that then on-off element T3 or T6 open circuit;
5, go up brachium pontis on-off element T5 conducting, turn-off T1 and T3, following brachium pontis on-off element T6 and T4 turn-off, and conducting T2 judges whether the electric machine phase current that receives is " 0 ", is to prove that then on-off element T5 or T2 open circuit;
6, go up brachium pontis on-off element T5 conducting, turn-off T1 and T3, following brachium pontis on-off element T6 and T2 turn-off, and conducting T4 judges whether the electric machine phase current that receives is " 0 ", is to prove that then on-off element T5 or T4 open circuit;
In step S1097, be that several situations of 0 combine and determine one or several on-off element and open circuit by electric machine phase current, concrete grammar is:
If detecting one group of combination phase current is non-" 0 " value, 2 on-off elements in detecting the combination that phase current is non-" a 0 " value did not open circuit so, other 4 on-off elements opened circuit.The as above T1 in the brachium pontis, T5, the T4 in the following brachium pontis, T6 opens circuit, and by 6 steps that detect, draws in 3 combination and obtains phase current and be not " 0 " value.Prove that thus T2 and T3 do not open circuit, other several on-off elements open circuit;
If detect two groups of phase current values is non-" 0 " value, comprises same on-off element in these two groups combinations so, and therefore 3 on-off elements in detecting two groups of combinations that phase current is non-" 0 " value did not open circuit, other 3 on-off elements opened circuit;
If detect three groups of phase current values is non-" 0 " value, comprises 2 identical on-off elements in these three groups combinations so, and therefore 4 on-off elements in detecting three groups of combinations that phase current is non-" 0 " value did not open circuit, other 2 on-off elements opened circuit;
If detect four groups of phase current values is non-" 0 " value, and phase current values comprises an identical on-off element for two groups of combinations of " 0 " so, and then this on-off element opens circuit, and all the other do not open circuit.
The proving installation of inverter can be the module that is built in software module, hardware module or software and hardware combining in the computing machine in the motor provided by the invention.
As shown in Figure 5, the on-off element control module 100 of the proving installation of inverter is used for switching mechanism gauge tap element according to predefined all on-off elements of inverter in the motor of the present invention.The shutoff module 101 of on-off element control module 100 is used to turn-off all on-off elements, the first overcurrent alarm signal detection module 301 of short-circuit detecting module 300 detects whether receive the overcurrent alarm signal this moment, and notifies short-circuit component determination module 305 with testing result.
When short-circuit component determination module 305 receives testing result that the first overcurrent alarm signal detection module 301 sends when receiving the overcurrent alarm signal, determine that the last brachium pontis of inverter and following brachium pontis all have an on-off element short circuit at least; When the testing result that receives when not having the overcurrent alarm signal, notify first conduction module 103 in turn each on-off element of conducting further judge.
On-off element of first conduction module, 103 each conductings, and after each conducting, notify the second overcurrent alarm signal detection module 303 to detect the overcurrent alarm signal, the second overcurrent alarm signal detection module 303 is notified short-circuit component determination module 305 with testing result, short-circuit component determination module 305 is determined short-circuit component according to the testing result that receives and the judgment mechanism of storage, for example, when short-circuit component determination module 305 receives the second overcurrent alarm signal detection module, 303 transmission testing results be: detect the overcurrent alarm signal during on-off element T1 conducting, then determine on-off element T2 short circuit with the T1 homophase, when testing result is: detect the overcurrent alarm signal during on-off element T3 conducting, determine on-off element T4 short circuit with the T3 homophase.
After short-circuit component determination module 305 is determined to finish at every turn, notify first conduction module 103 to continue the next on-off elements of conductings, the second overcurrent alarm signal detection module 303 and short-circuit component determination module 305 also all successively cycling all judge until six on-off elements and finish.
It is pointed out that at every turn, also the overcurrent alarm signal removed that so that motor can work on, each module also can continue to carry out detection after the second overcurrent alarm signal detection module 303 detects the overcurrent alarm signal.
Determine that at short-circuit component determination module 305 all on-off elements are not all during short circuit, notify first to open circuit and detect the control module 105 every phase brachium pontis of moment conducting successively, first opens circuit detects control module 105 every conducting one phase brachium pontis and all notifies the detection module 500 that opens circuit, the detection module 500 that opens circuit detects whether receive the overcurrent alarm signal this moment, and preservation testing result, notify first to open circuit and detect control module 105 and continue next phase brachium pontis of conducting then, so circulation is until the testing result that opens circuit that obtains all phases.
The overcurrent alarm signal occurs when detection module 500 detects a wherein phase on-off element conducting if open circuit, prove that two on-off elements of this phase all do not open circuit.
When after comprising a wherein phase on-off element conducting in the testing result of the detection module 500 that opens circuit, the situation of overcurrent alarm signal not occurring, prove that this has at least an on-off element to open circuit mutually, trigger second this moment and open circuit and detect control module 107 and make up out of phase two on-off elements of upper and lower bridge arm respectively, and each combination of conducting respectively.Wherein combination comprises:
1, goes up brachium pontis on-off element T1 and following brachium pontis on-off element T4;
2, go up brachium pontis on-off element T1 and following brachium pontis on-off element T6;
3, go up brachium pontis on-off element T3 and following brachium pontis on-off element T2;
4, go up brachium pontis on-off element T3 and following brachium pontis on-off element T6;
5, go up brachium pontis on-off element T5 and following brachium pontis on-off element T2; And
6, go up brachium pontis on-off element T5 and following brachium pontis on-off element T4.
Second opens circuit detect two on-off elements of a combination of control module 107 conductings simultaneously after, notify the detection module 500 that opens circuit to detect the phase current of motors, and preservation testing result, the detection module 500 that opens circuit then notifies second to open circuit and detect next combination of control module 107 conductings, all circulates conducting once until all combinations.
The detection module 500 that opens circuit is compared the following mechanism of each testing result and storage, determines the on-off element that opens circuit:
When testing result when wherein one group phase current is non-zero, two on-off elements in this group combination do not open circuit, the rest switch element opens circuit;
When testing result when wherein two groups phase current is nonzero value, three on-off elements in two groups of combinations do not open circuit, the rest switch element opens circuit;
When testing result when wherein three groups phase current is nonzero value, four on-off elements in three groups of combinations do not open circuit, the rest switch element opens circuit; And
When testing result when wherein four groups phase current is nonzero value, phase current is that the same on-off element in two groups of combinations of null value opens circuit, the rest switch element does not open circuit.
The present invention also provides a kind of motor, comprises the inverter proving installation that last embodiment provides in its controller, so the motor that provides of the invention process example also has and detects open circuit function with short circuit of IPM inverter.Electric machine controller can adopt single-chip microcomputer with powerful operation processing function or digital signal processor (Digital Signal Processor, DSP).The present invention can adopt the core component of dsp chip as proving installation.
In the motor provided by the invention in the method for testing of inverter and device and the motor, the short circuit that need not hardware detection IPM inverter with open circuit, do not change the structure of original motor, and adopt mathematics permutation and combination method to detect, simple relatively, be fit to add in the master routine of motor, can be complete detect IPM inverter whether short circuit and the various situations that open circuit.Both saved the plenty of time for program debug person, improved the service efficiency of program again, not only reached safe and reliable motor control strategy from another approach, and reduced the cost of product development to a certain extent, solve the control strategy imperfection problem in early stage of motor, also overcome a series of problems that hardware detection may occur simultaneously.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, the method for testing of inverter in a kind of motor is characterized in that described method comprises the steps:
Switching mechanism according to all on-off elements of predefined inverter is controlled described on-off element;
Detect the overcurrent alarm signal, determine the on-off element of short circuit according to detected overcurrent alarm signal.
2, the method for claim 1 is characterized in that, described switching mechanism comprises:
Turn-off all on-off elements;
Each on-off element of conducting in turn, when one of them on-off element of conducting, the rest switch element is all closed.
3, method as claimed in claim 2 is characterized in that, described method is specially:
Turn-off all on-off elements, detect the overcurrent alarm signal, the last brachium pontis of described inverter and following brachium pontis all have an on-off element short circuit at least when detecting the overcurrent alarm signal;
When not detecting the overcurrent alarm signal, each on-off element of conducting in turn, when one of them on-off element of conducting, the rest switch element is all closed;
All detect the overcurrent alarm signal after each on-off element conducting, determine and the whether short circuit of same another on-off element mutually of the on-off element of conducting according to testing result.
4, the method for claim 1 is characterized in that, also comprises:
When not detected the on-off element short circuit, the on-off element of each phase of moment conducting successively, the on-off element of described phase does not all open circuit when detecting the overcurrent alarm signal;
When not detecting the overcurrent alarm signal, make up out of phase two on-off elements of upper and lower bridge arm respectively;
Each combination of conducting respectively;
Detect the phase current of each combination after conducting;
According to detected phase current is zero combination, determines the on-off element that opens circuit.
5, method as claimed in claim 4 is characterized in that, described is zero combination according to detected electric current, determines that the method for the on-off element that opens circuit is:
When detecting the phase current of one group of combination after the conducting and be non-zero, two on-off elements in the described combination do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of two groups of combinations after the conducting and be non-zero, three on-off elements in described two groups of combinations do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of three groups of combinations after the conducting and be non-zero, four on-off elements in described three groups of combinations do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of four groups of combinations after the conducting and be non-zero, phase current is that the same on-off element in two groups of combinations of zero opens circuit, and the rest switch element does not open circuit.
6, inverter proving installation in a kind of motor is characterized in that, described device comprises:
The on-off element control module is connected with described inverter, is used for controlling described on-off element according to the switching mechanism of predefined all on-off elements of inverter; And
The short-circuit detecting module is connected with described inverter, is used to detect the overcurrent alarm signal, and determines the on-off element of short circuit according to detected overcurrent alarm signal.
7, device as claimed in claim 6 is characterized in that, described short-circuit detecting module comprises:
The first overcurrent alarm signal detection module, be used for detecting the overcurrent alarm signal after described on-off element control module is turn-offed the notice of all on-off elements receiving, when not detecting the overcurrent alarm signal, trigger described on-off element control module and take turns each on-off element of conducting, when one of them on-off element of conducting, the rest switch element is all closed;
The second overcurrent alarm signal detection module is used for detecting the overcurrent alarm signal after the notice that at every turn receives described one of them on-off element of on-off element control module conducting; And
The short-circuit component determination module is used for determining short-circuit component according to the testing result of the described first and second overcurrent alarm signal detection modules.
8, device as claimed in claim 7 is characterized in that:
Described on-off element control module further comprises the first detection control module that opens circuit, and is used for the on-off element of each phase of moment conducting;
Described device further comprises the detection module that opens circuit, be used for opening circuit and detecting the overcurrent alarm signal after the notice of the on-off element that detects each phase of control module conducting receiving described first, determine that when detecting the overcurrent alarm signal on-off element of described phase does not all open circuit.
9, device as claimed in claim 8 is characterized in that:
Described on-off element control module further comprises the second detection control module that opens circuit, be used for after the notice that does not detect the overcurrent alarm signal that receives the described detection module output of opening circuit, make up out of phase two on-off elements of upper and lower bridge arm respectively, and each combination of conducting respectively;
The described detection module that opens circuit is further used for detecting the phase current after each combination conducting, and is that the on-off element that opens circuit is determined in zero combination according to detected phase current.
10, device as claimed in claim 9 is characterized in that, the described detection module that opens circuit is that zero combination is compared with the element judgment mechanism that opens circuit of storage with detected phase current, determines the on-off element that opens circuit, and described mechanism is specially:
When detecting the phase current of one group of combination after the conducting and be non-zero, the described detection module that opens circuit determines that two on-off elements in the described combination do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of two groups of combinations after the conducting and be non-zero, the described detection module that opens circuit determines that three on-off elements in described two groups of combinations do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of three groups of combinations after the conducting and be non-zero, the described detection module that opens circuit determines that four on-off elements in described three groups of combinations do not open circuit, and the rest switch element opens circuit;
When detecting the phase currents of four groups of combinations after the conducting and be non-zero, the described detection module that opens circuit determines that phase current is that same on-off element in two groups of combinations of zero opens circuit, and the rest switch element does not open circuit.
11, a kind of motor is characterized in that, described motor comprises the inverter proving installation, and described device comprises:
The on-off element control module is connected with described inverter, is used for controlling described on-off element according to the switching mechanism of predefined all on-off elements of inverter; And
The short-circuit detecting module is connected with described inverter, is used to detect the overcurrent alarm signal, and determines the on-off element of short circuit according to detected overcurrent alarm signal.
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| CN 200710076925 CN101382585B (en) | 2007-09-07 | 2007-09-07 | Test method, apparatus and generator for inverter in generator |
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| CN 200710076925 CN101382585B (en) | 2007-09-07 | 2007-09-07 | Test method, apparatus and generator for inverter in generator |
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| CN101382585B CN101382585B (en) | 2011-01-26 |
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| CN102495350A (en) * | 2011-12-14 | 2012-06-13 | 杭州士兰微电子股份有限公司 | Test device and test method for testing intelligent power module |
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