CN1276573C - Inverter unit - Google Patents
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- CN1276573C CN1276573C CN 01140669 CN01140669A CN1276573C CN 1276573 C CN1276573 C CN 1276573C CN 01140669 CN01140669 CN 01140669 CN 01140669 A CN01140669 A CN 01140669A CN 1276573 C CN1276573 C CN 1276573C
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Abstract
To smoothly operate an inverter unit, and to prevent breakdown of a smoothing capacitor by evading erroneous detection of ripples contained in the DC link voltage of the inverter unit. The inverter unit is fitted with a voltage detecting means (3) which detects its DC link voltage (VDC) and outputs a detection output, a computing means (7) which computes a ripple (&Delta VDC) contained in the DC link voltage (VDC) from the detection output of the detecting means (39, a comparator (9) for comparing the computed value by the computing means (7) with a reference value (&Delta V*), and an erroneous detection preventing circuit (10) for controlling an inverter (5) by the comparison output of the comparator (9). The preventing circuit (10) is provided with a counter which counts the number of times of detection of ripples (&Delta VDC) which are larger than the reference value (&Delta V*) when the comparator (9) detects the ripples (&Delta VDC), and increases its count value successively, and operation of the inverter (5) is stopped when the comparator (9) detects ripples (&Delta VDC) larger than the reference value (&Delta V*) continuously and the count value of the counter reaches a specified one.
Description
Technical field
The present invention relates to convert direct current to, convert the DC-to-AC converter of interchange again to, particularly relate to the DC-to-AC converter of the damage that can prevent the smoothing capacitor that causes by the fluctuation that is comprised in the DC link voltage exchanging input.
Background technology
For example, open strictly according to the facts shown in the flat 5-43800 communique, do not use the contact relay and detect the broken string of fuse, and the DC-to-AC converter that detects the phase shortage of three-phase alternating-current supply is known.As shown in Figure 5, this DC-to-AC converter, the electric power of three-phase alternating-current supply 51 supplies to full-wave rectifying circuit 53 via each fuse 52 that all has mutually and carries out rectification, and then leans on smoothing capacitor 54 by direct currentization.The output of this direct current supplies to the known inverter circuit 56 that the switch element controlled by the control circuit (not shown) constitutes, and converts assigned frequency to exchanging of voltage and drive motor 57 by inverter circuit 56.In addition, in the DC circuit of DC-to-AC converter, the fuse that burns 58 when preventing short circuit is set.Thereby abnormal detector 61 has in the direct current main circuit that is inserted into DC-to-AC converter two resistors 62 of direct voltage dividing potential drop, 63, reproduce the voltage detecting circuit 64 of direct voltage on electric under the state of insulation, from the output of voltage detecting circuit 64, only take out the AC portion testing circuit 65 of AC portion, the peak holding circuit 66 of the peak value of the output of maintenance AC portion testing circuit 65, and having a peak value and set point compares, judgement is lower than the lower limit that sets or surpasses the higher limit that sets, at two comparators 67 of suitable occasion output abnormality signal, 68.Voltage detecting circuit 64 is by setting and leaning on resistor 62,63 come the duty ratio initialization circuit 69 of the proportional duty ratio of magnitude of voltage of dividing potential drop, switch the transistor 70 that comes the voltage of dividing potential drop by the output signal of duty ratio initialization circuit 69, the signal that switches by transistor 70 is delivered to the photoelectrical coupler 71 of secondary side, the buffer storage 72 that the signal of the secondary side of photoelectrical coupler 71 is carried out shaping, to shaping in buffer storage 72 the signal integrator 73 that carries out integration constitute.
Reproduce by voltage detecting circuit 64 under the state of the voltage of direct current main circuit insulation on electric.Only detect AC portion by AC portion testing circuit 65 from the output signal of voltage detecting circuit 64, the peak value of the voltage fluctuation of direct current main circuit detects by peak holding circuit 66.Whereby, testing agency is by resistor 62,63, voltage detecting circuit 64, and AC portion testing circuit 65 and peak holding circuit 66 constitute.
The output valve of peak holding circuit 66 deliver to comparator 67,68 both, compare with predefined higher limit and lower limit respectively.Break away from the occasion of the scope of higher limit and lower limit, output abnormality signal in the output valve of peak holding circuit 66.In addition, comparator 67,68 only moves when the run signal of DC-to-AC converter becomes running status.Thereby comparator 67,68 is as abnormality detection mechanism performance function.
Though do not draw, but in occasion from control circuit or abnormal detector 61 output abnormality signals, in the outside of DC-to-AC converter, order in accordance with regulations switches to operation of being undertaken by other DC-to-AC converter or the operation of being undertaken by source power supply to the driving of motor 57.
During the DC-to-AC converter operate as normal, in the direct current main circuit, produce 6 times voltage fluctuation of the output frequency that is equivalent to three-phase alternating-current supply 51 according to the give and accept relation of electric power.Though this voltage fluctuation detects by voltage detecting circuit 64 and AC portion testing circuit 65, in that just often its peak value is very little, is in the higher limit and the scope between the lower limit that sets.Thereby, the abnormal signal that blows from comparator 67 or comparator 68 fuse outputs not.
If the generation phase shortage, the power supply that then is input to DC-to-AC converter becomes single-phase state, and the voltage fluctuation that supplies to the direct current main circuit strengthens.Thereby, also strengthening and surpass the higher limit that sets by voltage fluctuation that voltage detecting circuit 64 detected from the peak value that peak holding circuit 66 is exported, the result is from the abnormal signal of comparator 67 output phase shortages.So, detect the voltage of direct current main circuit or the size of current fluctuation, do not use the contact relay just can detect input and the fuse broken string of inside and the phase shortage of three-phase alternating-current supply of DC-to-AC converter.
Shown in Fig. 5 with the three-phase alternating-current supply be the input DC-to-AC converter in, though the pulsation (fluctuation) that is comprised in leaning on the direct current of full-wave rectifying circuit 53 rectifications is level and smooth by smoothing capacitor 54, but it is bad in the power supply situation, phase shortage or unbalanced occasion take place in the power supply or wrong DC-to-AC converter is connected to the occasion of single phase poaer supply, the fluctuation that is comprised in the direct current strengthens.In this occasion, exist the lost of life that causes smoothing capacitor 54 because of fluctuation, or the internal temperature abnormal ascending of smoothing capacitor 54 and inner electrolyte leakage, the explosion-proof valve action is broken and is waited the shortcoming of breakage.In addition, the abnormality detection mechanism that special-purpose input voltage detection circuit detects phase shortage is set, the detecting element of circuit structure complexity and needs high price.In addition, continue to use then cause smoothing capacitor 54 breakages if surpass the expectation life-span of smoothing capacitor 54.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of flase drop of avoiding the fluctuation that comprised in the DC link voltage of DC-to-AC converter to survey and DC-to-AC converter is worked smoothly, and can prevent the DC-to-AC converter of the breakage of smoothing capacitor.
Via rectification circuit 2 alternating electromotive forces from three-phase alternating-current supply 1 input are converted to direct current power, by inverter 5 by smoothing capacitor 4 level and smooth the DC link voltage V of direct current power
DCConvert alternating electromotive force to and power, have and detect DC link voltage V to the DC-to-AC converter of the present invention of load 6
DCAnd produce the voltage detection mechanism 3 that detects output, accept the detection output of this voltage detection mechanism, to DC link voltage V
DCIn the fluctuation Δ V that comprised
DCCarry out the arithmetical organ 7 of calculation process, the operation values of the voltage fluctuation of this arithmetical organ 7 outputs is compared and produce the relatively comparator 9 of output with fiducial value Δ V*, and accept the relatively output of comparator 9 and the flase drop survey that inverter 5 stops to control is prevented circuit 10.Flase drop is surveyed and to be prevented that circuit 10 from having at comparator 9 and detect fluctuation Δ V greater than fiducial value Δ V*
DCThe time, counting fluctuation Δ V
DCThe detection number of times and make the counter of count value progression, detect fluctuation Δ V continuously at comparator 9 greater than fiducial value Δ V*
DCAnd counter is when reaching the count value of regulation, and flase drop is surveyed and prevented that circuit 10 from stopping the operation of inverter 5.In addition, detect fluctuation Δ V continuously at comparator 9 greater than fiducial value Δ V*
DCAnd counter is not when reaching the count value of regulation, and flase drop is surveyed and prevented that circuit 10 from continuing the operation of inverters 5.And then, detect fluctuation Δ V at comparator 9 less than fiducial value Δ V*
DCThe time, flase drop is surveyed and is prevented that circuit 10 is DC link voltage V
DCFluctuation Δ V
DCJudge into suitable value and the count value zero clearing of counter is continued the operation of inverter 5.Whereby, the Δ V that avoids fluctuating
DCThereby flase drop survey inverter 5 successfully worked, and by correctly detecting fluctuation Δ V
DCCan prevent the breakage of smoothing capacitor 4.
In an embodiment of the present invention, arithmetical organ 7 from the detection of voltage detection mechanism 3 output in the regular hour, inherent each small time interval of 100ms for example, for example in the 2ms to DC link voltage V
DCSample, obtain DC link voltage V
DCMaximum voltage value 11 and minimum voltage value 12, then the potential difference 13 of maximum voltage value 11 and minimum voltage value 12 is taken as DC link voltage V
DCFluctuation Δ V
DCThereby can in the small time interval, correctly detect fluctuation Δ V
DCHave or not.Arithmetical organ 7 detects DC link voltage V
DC, DC link voltage V
DCWith maximum V
DCMAXCompare, at DC link voltage V
DCGreater than maximum V
DCMAXShi Gengxin stores maximum V
DCMAXThe maximum storing mechanism in maximum; DC link voltage V
DCWith minimum value V
DCMINCompare, at DC link voltage V
DCLess than minimum value V
DCMINShi Gengxin stores minimum value V
DCMINThe minimum value storing mechanism in minimum value, judge secondary undulation Δ V in the past then
DCComputing play whether passed through certain hour, when having passed through certain hour, calculate fluctuation Δ V
DC, carry out maximum V
DCAXWith minimum value V
DCMINInitialization.Because fluctuation Δ V
DCMaximum V
DCMAXWith minimum value V
DCMINIn the regular hour scope, be updated to optimum value all the time, so can correctly calculate fluctuation Δ V
DC
Flase drop is surveyed and to be prevented that circuit 10 is when the not enough certain ratio of load factor, DC link voltage V
DCRegenerative braking resistance action beginning level V during with deceleration
SVCompare, at DC link voltage V
DCSurpass regenerative braking resistance action beginning level V
SVThe time or whether judge load 6 just in stable operation, not being just in the occasion of stable operation, continue the operation of inverter 5, but when load factor surpasses certain ratio, DC link voltage V
DCLess than regenerative braking resistance action beginning level V
SVThe time or load 6 just when stable operation, stop the operation of inverter 5.
Description of drawings
Fig. 1 is the frame circuit diagram according to DC-to-AC converter of the present invention of drive motor.
Fig. 2 is the oscillogram of the DC link voltage exported from the rectification circuit shown in Fig. 1.
Fig. 3 is the flow chart that calculates the fluctuation that is comprised in the DC link voltage.
Fig. 4 is the flow chart that the flase drop shown in the presentation graphs 1 is surveyed the sequence of movement that prevents circuit.
Fig. 5 is the frame circuit diagram of conventional inversion apparatus.
Embodiment
Below just Fig. 1～Fig. 4 embodiment according to DC-to-AC converter of the present invention is described.
As shown in fig. 1, DC-to-AC converter according to the present invention has the rectification circuit 2 that is made of diode bridge that the alternating electromotive force of being imported from three-phase alternating-current supply 1 is converted to direct current power, the direct current power of rectification circuit 2 is converted to the inverter 5 of alternating electromotive force, and the motor 6 of the load that drives as the alternating electromotive force by inverter 5.Between a pair of output line of rectification circuit 2, connecting the DC link voltage V of the direct current power that makes rectification circuit 2
DCLevel and smooth smoothing capacitor 4.Smoothing capacitor 4 makes DC link voltage V usually
DCIn the level and smooth electrolytic capacitor of pulsation fluctuation that comprised.Under normal user mode, because reduce DC link voltage V by smoothing capacitor 4
DCIn the fluctuation that comprised, so smoothing capacitor 4 is not damaged.Yet, the occasion of a phase phase shortage or non-equilibrium state in the middle of the three-phase that becomes AC power 1, DC link voltage V
DCFluctuation become big, if continue drive motor 6 under this state, the internal temperature abnormal ascending of smoothing capacitor 4 and cause that electrolyte leakage, explosion-proof valve move, break etc. then is soon just as for breakage.Though, on rectification circuit 2 one sides' AC line, connecting detection DC link voltage V because known and do not draw in detail
DCVoltage detecting resistance or voltage detection mechanism 3 such as coil.The DC link voltage V that voltage detection mechanism 3 detects
DCSend to arithmetical organ 7, arithmetical organ 7 calculates DC link voltage V
DCIn the fluctuation Δ V that comprised
DC
Fig. 2 is DC link voltage V
DCOscillogram.Arithmetical organ 7 is made of the microcomputer that has programme controlled unillustrated maximum storing mechanism and minimum value storing mechanism, from the detection of voltage detection mechanism 3 output in the certain hour of 100ms in the small time interval of each 2ms to DC link voltage V
DCSample, obtain DC link voltage V
DCMaximum voltage value 11 and minimum voltage value 12.Then the potential difference 13 of maximum voltage value 11 and minimum voltage value 12 is taken as DC link voltage V
DCFluctuation Δ V
DCSo, can in the small time interval, correctly detect fluctuation Δ V
DCHave or not.The operation values of arithmetical organ 7 converts the input that corresponding level supplies to comparator 9 one sides to.On comparator 9 the opposing party's input, add the fiducial value Δ V* of reference power supply 8.Arithmetical organ 7 detects DC link voltage V
DC, DC link voltage V
DCWith maximum V
DCMAXCompare, at DC link voltage V
DCGreater than maximum V
DCMAXShi Gengxin stores maximum V
DCMAXThe maximum storing mechanism in maximum, DC link voltage V
DCWith minimum value V
DCMINCompare, at DC link voltage V
DCLess than minimum value V
DCMINShi Gengxin stores minimum value V
DCMINThe minimum value storing mechanism in minimum value, judge secondary undulation Δ V in the past then
DCComputing play whether passed through certain hour, when having passed through certain hour, calculate fluctuation Δ V
DC, carry out maximum V
DCMAXWith minimum value V
DCMINInitialization.Whereby, because fluctuation Δ V
DCMaximum V
DCMAXWith minimum value V
DCMINIn the regular hour scope, be updated to optimum value all the time, so can correctly calculate fluctuation V
DC
Comparator 9 is the voltage fluctuation Δ V of arithmetical organ 7 outputs
DCOperation values and fiducial value Δ V* compare and take place relatively to export.Flase drop is surveyed and to be prevented that circuit 10 from accepting the relatively output of comparator 9 and inverter 5 is controlled.Flase drop is surveyed and is prevented that circuit 10 from having counting fluctuation Δ V
DCThe unillustrated counter of detection number of times, detect fluctuation Δ V at comparator 9 less than fiducial value Δ V*
DCThe time, DC link voltage V
DCFluctuation Δ V
DCJudge into suitable value, the detection number of times zero clearing of counter is continued the operation of inverter 5.Detect fluctuation Δ V at comparator 9 greater than fiducial value Δ V*
DCThe time, flase drop is surveyed and is prevented circuit 10 counting fluctuation Δ V
DCThe detection number of times and make the count value progression of counter, detect fluctuation Δ V continuously at comparator 9 greater than fiducial value Δ V*
DCAnd counter continues the operation of inverter 5 when not reaching the count value of regulation.In addition, owing to the fluctuation Δ V that detects continuously at comparator 9 greater than fiducial value Δ V*
DCAnd flase drop is surveyed when preventing that circuit 10 interior counters from reaching the count value of regulation, stops the operation of inverter 5, so the Δ V that avoids fluctuating
DCThereby flase drop survey inverter 5 successfully worked, and by correctly detecting fluctuation Δ V
DCCan prevent the breakage of smoothing capacitor 4.
Flase drop is surveyed and to be prevented that circuit 10 is when the not enough certain ratio of the load factor of motor 6, DC link voltage V
DCRegenerative braking resistance action beginning level V during with deceleration
SVCompare, at DC link voltage V
DCSurpass regenerative braking resistance action beginning level V
SVThe time or whether judge motor 6 just in stable operation, not being just in the occasion of stable operation, continue the operation of inverter 5, but when the load factor of motor 6 surpasses certain ratio, DC link voltage V
DCLess than regenerative braking resistance action beginning level V
SVThe time or motor 6 just when stable operation, flase drop is surveyed and is prevented that circuit 10 from stopping the operation of inverter 5.Here, so-called stable operation represents that the acceleration of motor 6 finishes back target frequency (setpoint frequency) running status consistent with the output frequency of inverter 5.
Fig. 3 is that DC link voltage V is calculated in expression
DCFluctuation Δ V
DCThe flow chart of sequence of movement.At the step 14 Δ V that li begins to fluctuate
DCCalculating, li carry out DC link voltage V in step 15
DCDetection handle.Then in step 16 DC link voltage V
DCWith maximum V
DCMAXCompare, at DC link voltage V
DCGreater than maximum V
DCMAXThe time, store maximum V in step 17 a li renewal
DCMAXThe maximum storing mechanism in maximum.Then in step 18 DC link voltage V
DCWith minimum value V
DCMINCompare, at DC link voltage V
DCLess than minimum value V
DCMINThe time, store minimum value V in step 19 a li renewal
DCMINThe minimum value storing mechanism in minimum value.Then, at step 20 li judgement the past secondary undulation Δ V
DCComputing play whether passed through 100ms, when having passed through 100ms, at step 21 li computing fluctuation Δ V
DC, the maximum V in the maximum storing mechanism after just upgrading
DCMAXWith upgrade after the minimum value storing mechanism in minimum value V
DCMINDifference V
DCMAX-V
DCMIN, li carry out maximum V in step 22
DCMAXWith minimum value V
DCMINInitialization, finish calculation process in step 23 li.
Fig. 4 is that expression is fluctuation Δ V
DCProcessing that compares with fiducial value Δ V* and flase drop are surveyed the flow chart of the sequence of movement that prevents circuit 10.After step 24 li begins to handle, in step 25 fluctuation Δ V
DCV* compares with the fiducial value Δ.At fluctuation Δ V
DCLess than the occasion of fiducial value Δ V*, flase drop is surveyed and is prevented that circuit 10 is DC link voltage V
DCFluctuation Δ V
DCJudge into suitable value and enter step 27, in step 27 the detection number of times zero clearing of counter, in the operation of step 33 li continuation inverter 5 and enter step 35.In step 25 li at fluctuation Δ V
DCOccasion greater than fiducial value Δ V* enters step 26, step 26 li by for example in counter, add one by one 1 make the count value progression of counter after, enter step 28.Li judge in step 28 whether the count value of counter for example reaches 10 and detected continuously 10 times, reach 10 occasion in count value and enter step 29, when count value less than 10, enter the operation that step 33 continues inverter 5, enter step 35.Here, flase drop is surveyed and to be prevented that circuit 10 from judging whether to have detected continuously stipulated number, and for example 10 times reason is when fluctuation increases in the relatively shorter time inverter 5 unnecessarily to be stopped for flase drop survey that the noise in voltage detection mechanism 3 causes, instantaneous power-off, load change etc.
Then, li whether judge motor 6, when motor 6 acceleration-deceleration work, enter the operation that step 33 continues inverter 5, enter step 35 just in stable operation in step 29.When motor 6 acceleration-decelerations, because big output current takes place inverter 5, so DC link voltage V
DCChange easily.Thereby the flase drop under the normal user mode is surveyed, so be necessary at motor 6 it is not to continue to make inverter 5 to work during just in stable operation.In addition, survey, so do not detect fluctuation Δ V in order when inverter 5 stops, also avoiding flase drop
DCJust in the occasion of stable operation, enter step 30 at motor 6, survey at step 30 li flase drop and prevent that circuit 10 from judging whether load factor surpasses 50%, enters step 33 and continue to enter step 35 after the operation of inverter 5 when load factor less than 50%.Surpass at 50% o'clock in load factor and enter step 31.Here, the reason that continues the operation of inverter 5 when load factor less than 50% is, even for example in the input power supply phase shortage DC link voltage V when underload takes place
DCFluctuation Δ V
DCAlso smaller, so and the differentiation difficulty of normal user mode, the cause that the flase drop under these normal conditions that cause is surveyed.
Then, prevent that in step 31 a li flase drop survey circuit 10 is DC link voltage V
DCRegenerative braking resistance action beginning level V during with deceleration
SVCompare, at DC link voltage V
DCSurpass regenerative braking resistance action beginning level V
SVThe time, in the operation of step 33 li continuation inverter 5 and enter step 35.If during owing to slow down via inverter 5 from motor 6 to DC-link circuit regenerative electric energy, then DC link voltage V
DCRise, so distinguish this variation in voltage and fluctuation voltage is difficult.Therefore, preferably at DC link voltage V
DCSurpass regenerative braking resistance action beginning level V
SVThe operation of Shi Jixu inverter 5.
At step 31 li DC link voltage V
DCLess than regenerative braking resistance action beginning level V
SVThe time enter step 32, stop the work of inverter 5, protection smoothing capacitor 4, and li make unillustrated siren or the work of optics siren in step 34 is reported DC link voltage V
DCFluctuation Δ V
DCBig situation enters step 35, finishes all to handle.
Previous embodiment of the present invention can change.For example, though use motor 6 as load in the aforementioned embodiment, load is not limited to motor, also can apply to the present invention by the power converter that constitutes with the same main circuit of Fig. 1.In addition; though the protection with smoothing capacitor 4 is a purpose in the aforementioned embodiment; excessively increase but also can detect the fluctuation that results from the unusual and recurrent DC link voltages of input voltage such as phase shortage, imbalance, carry out the unusual alarm of input voltage.And then because the capacity of aging smoothing capacitor 4 is when reducing, fluctuation also strengthens, and detects and reports the device in the life-span of smoothing capacitor 4 and utilize so also can be used as.
As described above, thereby the error detection of avoiding fluctuating is successfully worked inverter, and logical After correctly detecting fluctuation inverter is stopped, can preventing the breakage of smoothing capacitor. Exist The internal temperature that suppresses whereby smoothing capacitor and rise, prevent the life-span contracting of smoothing capacitor Short, electrolyte leakage or break and wait the advantage of breakage.
Claims (6)
1. DC-to-AC converter, via rectification circuit the alternating electromotive force from the three-phase alternating-current supply input is converted to direct current power, by inverter by smoothing capacitor level and smooth the DC link voltage of described direct current power convert the alternating electromotive force supply load to, it is characterized in that
Have: detect described DC link voltage and produce the voltage detection mechanism that detects output; Accept the detection output of this voltage detection mechanism, the fluctuation that is comprised in the described DC link voltage is carried out the arithmetical organ of calculation process; The operation values and the fiducial value of the voltage fluctuation of this arithmetical organ output are compared the comparator that generation is relatively exported; And accept flase drop that relatively exporting of this comparator stop to control to inverter and survey and prevent circuit,
Described flase drop is surveyed and is prevented that circuit from having the counter of counting the detection number of times of described fluctuation and make the count value progression when described comparator detecting described fluctuation greater than described fiducial value,
Detect continuously when having reached the count value of regulation greater than the described fluctuation of described fiducial value and described counter at described comparator, described flase drop is surveyed and is prevented that circuit from stopping the operation of described inverter,
Detect continuously when not reaching the count value of regulation greater than the described fluctuation of described fiducial value and described counter at described comparator, described flase drop is surveyed and is prevented that circuit from continuing the operation of described inverter,
When described comparator detected described fluctuation smaller or equal to described fiducial value, described flase drop was surveyed and is prevented that circuit from judging into suitable value to the described fluctuation of described DC link voltage and the count value zero clearing of described counter and continue the operation of described inverter.
2. DC-to-AC converter as claimed in claim 1, it is characterized in that, described arithmetical organ is sampled to DC link voltage by each small time interval in the regular hour from the detection output of described voltage detection mechanism, obtain the maximum voltage value and the minimum voltage value of DC link voltage, then the potential difference of described maximum voltage value and described minimum voltage value is taken as the fluctuation of DC link voltage.
3. DC-to-AC converter as claimed in claim 2, it is characterized in that, described arithmetical organ detects described DC link voltage, described DC link voltage and maximum voltage value are compared, upgrade maximum voltage value in the maximum voltage value storing mechanism that stores described maximum voltage value during greater than described maximum voltage value at described DC link voltage; Described DC link voltage and minimum voltage value are compared, upgrade minimum voltage value in the minimum voltage value storing mechanism that stores described minimum voltage value during less than described minimum voltage value at described DC link voltage, judge then the computing of secondary undulation plays whether passed through certain hour in the past, when having passed through certain hour, calculate fluctuation, carry out the initialization of maximum voltage value and minimum voltage value.
4. DC-to-AC converter as claimed in claim 1, it is characterized in that, described flase drop is surveyed and is prevented that circuit from continuing the operation of described inverter after described counter has reached the count value of regulation, during load factor is not enough certain ratio, stops the operation of described inverter during more than or equal to certain ratio in load factor.
5. DC-to-AC converter as claimed in claim 1, it is characterized in that, described flase drop is surveyed and is prevented that circuit from beginning level to the regenerative braking resistance action of described DC link voltage when slowing down and comparing after described counter has reached the count value of regulation, when described DC link voltage begins level more than or equal to the action of regenerative braking resistance, continue the operation of described inverter, when described DC link voltage begins level less than the action of regenerative braking resistance, stop the operation of described inverter.
6. DC-to-AC converter as claimed in claim 1, it is characterized in that, described flase drop is surveyed and is prevented that circuit from having reached the count value of stipulating at described counter and having judged that whether described load is just in stable operation later, not the operation that is just continuing described inverter, stopping the operation of described inverter in described load during just in stable operation in the occasion of stable operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP39902/2001 | 2001-02-16 | ||
| JP2001039902A JP3409327B2 (en) | 2001-02-16 | 2001-02-16 | Inverter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1371161A CN1371161A (en) | 2002-09-25 |
| CN1276573C true CN1276573C (en) | 2006-09-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01140669 Expired - Fee Related CN1276573C (en) | 2001-02-16 | 2001-09-20 | Inverter unit |
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|---|---|
| JP (1) | JP3409327B2 (en) |
| CN (1) | CN1276573C (en) |
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2001
- 2001-02-16 JP JP2001039902A patent/JP3409327B2/en not_active Expired - Fee Related
- 2001-09-20 CN CN 01140669 patent/CN1276573C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3409327B2 (en) | 2003-05-26 |
| JP2002247859A (en) | 2002-08-30 |
| CN1371161A (en) | 2002-09-25 |
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