CN101202515B - Electric power convertion device - Google Patents
Electric power convertion device Download PDFInfo
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- CN101202515B CN101202515B CN2007101491335A CN200710149133A CN101202515B CN 101202515 B CN101202515 B CN 101202515B CN 2007101491335 A CN2007101491335 A CN 2007101491335A CN 200710149133 A CN200710149133 A CN 200710149133A CN 101202515 B CN101202515 B CN 101202515B
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- cooling fan
- power
- circuit
- power inverter
- short circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
- Power Conversion In General (AREA)
Abstract
The invention provides a power converting device which can achieve the convenient use property of the device no matter used in whatever environments. In order to achieve the proposal of the invention, the invention comprises a power converting circuit (1 to 3) which supplies an AC motor (4) with AC power with variable voltage and variable frequency; a cooling fan (6) arranged for cooling the cooling fin of a power semiconductor carried with the power converting circuit (1 to 3); and a semiconductor switch for driving and stopping the cooling fan (6) in the power supplying circuit of the cooling fan (6); and a detection circuit for detecting the abnormities such as short failure of the cooling fan (6). The detection circuit cuts the power supply of the cooling fan (6) off if detecting any short abnormity.
Description
Technical field
The present invention relates to power inverter.
Background technology
Because bigger loss takes place the power semiconductor in the power inverter, thereby adopt structure to cooling off by heat that this loss produces.That is, possess cooling fin and cooling fan (fan), make and conduct to the cooling fin, and carry air to carry out heat exchange to the cooling fin, carry out heat release through cooling air mode through cooling fan from the semi-conductive heat of power (power) as heater.
In patent documentation 1 (japanese kokai publication hei 7-154976 communique); For the life-span that makes cooling fan longer; Detection is equipped with the temperature on the cooling fin of each module that is made up of power semiconductor, according to the startup of the height control cooling fan of the temperature value that is detected or stop.Through carrying out such control, reduce the degradation of cooling fan, thereby prolong the useful life of parts.And; In patent documentation 2 (japanese kokai publication hei 3-168991 communique) publicity air-cooled power inverter; When fan motor (fan motor) failed because; In order to suppress flowing of short circuit current, use relay (relay) circuit, short circuit current is flowed via resistance.
Cooling fan is to exist as the life-span parts that can reduce through behavior in service, but in power inverter the element of the preferred long service life of employed element.General, cooling fan rotation speed reduces by moment of 20% o'clock for example with respect to its initial stage rotating speed and is defined as life-span of cooling fan.In order to cool off the major component of converter (inverter), this speed of cooling fan is preferably and can promptly, preferably has high-revolving cooling fan with high rotating speed rotation.
But even before the life-span, along with the change of time speed of cooling fan also can reduce along with the elongated of operating time, perhaps, there is the problem that causes cooling fan power supply short circuit fault in dust and the moisture in the environment that be provided with owing to power inverter.Though because cooling fan is rotary body, and use bearing (bearing) and lubricating grease (grease), the difference that environment already plants according to industry is set can has a lot of difference of power inverter, it usually is very difficult having desirable condition.
Therefore; When the Temperature Detector as the major component of the converter of power inverter detects superheat state; Judging main being caused by following which kind of reason is the comparison difficulty, and said each reason comprises: because the speed of cooling fan reduction that major component is cooled off causes cooling capacity to reduce; Because the environment temperature of convertor device rises; Or, cooling fan quits work owing to breaking down.Therefore, under these circumstances, stopping using the equipment of power inverter, the completion reason is judged and is got rid of fault and need spend considerable time, exists such problem.
That is, the situation that can detect the temperature rising of converter major component is caused by many-sided reason, can not accomplish so equipment is carried out the thoughtful protection of prevention completely.Consequently, when situation occurred, judge that the time of reason and service equipment has to become the time that equipment is stopped,, just become the reason of bringing obstacle to productivity ratio for equipment integral.Therefore, hope the ease of use of raising equipment aspect.
In patent documentation 1; Publicity goes out to seek the structure of the long lifetime of cooling fan; In patent documentation 2; Publicity goes out the structure that is used to protect power circuit when fan motor breaks down, but not have to consider when the temperature rising of cooling object the judgement of its reason, perhaps, stops relevant thing with the equipment that is using power inverter.
Summary of the invention
The present invention proposes in view of the above problems, uses the power inverter that also can realize improving the ease of use aspect the equipment even its objective is to provide various be provided with in the environment.
The embodiment of the present invention that is used to reach above-mentioned purpose is following.
Power inverter in first mode; Its structure does; Comprise power conversion circuit and the cooling fan that is used for the cooling fin that is equipped with the power semiconductor in this power conversion circuit is cooled off that the alternating electromotive force of variable voltage variable frequency is provided to alternating current motor; Have the testing circuit of the short circuit that detects this cooling fan, detecting through this testing circuit under the situation of short circuit, cut off the power supply of above-mentioned cooling fan is supplied with.
In addition; Power inverter in second mode; Its structure does; Comprise alternating voltage to AC power carry out rectification be converted into direct voltage positive transducer, make the level and smooth smmothing capacitor of the direct voltage of this positive transducer and the direct voltage of above-mentioned positive transducer converted into the inverse converter of alternating voltage; The alternating electromotive force of this power inverter output variable voltage variable frequency, this power inverter also comprises: the cooling fin that the power semiconductor that constitutes above-mentioned positive transducer and above-mentioned inverse converter is cooled off; Be used to cool off the cooling fan of this cooling fin; Detect the Temperature Detector of the temperature of above-mentioned power semiconductor; Supply with the switch voltage-stabilizing circuit (switching regulator) of direct voltage from above-mentioned smmothing capacitor reception direct voltage and to above-mentioned cooling fan; Detection is to the testing circuit of the service voltage of above-mentioned cooling fan; And control device;, the temperature that is detected by the said temperature detector controls when surpassing set point with the mode of arresting stop; And, when detecting the short circuit of above-mentioned cooling fan by above-mentioned testing circuit, control to cut off the mode that the power supply of above-mentioned cooling fan is supplied with.
Moreover in other words wherein in any one mode, that be more preferably, concrete execution mode is following at above-mentioned dual mode:
(1) is included in by above-mentioned testing circuit and detects the short circuit of above-mentioned cooling fan when unusual, show the unusual display part of short circuit.
(2) comprise the guidance panel of the operating condition of setting this power inverter, above-mentioned display part is arranged on this guidance panel.
(3) when the short circuit that is detected above-mentioned cooling fan by above-mentioned testing circuit was unusual, above-mentioned control device did not cut off the output of above-mentioned power inverter, cuts off the power supply of above-mentioned cooling fan is supplied with.
(4) above-mentioned switch voltage-stabilizing circuit; Except that above-mentioned cooling fan; At least to control circuit that comprises above-mentioned control device and above-mentioned testing circuit supply power; When the short circuit that is detected above-mentioned cooling fan by above-mentioned testing circuit is unusual, do not cut off above-mentioned power inverter output, supply with to the power supply of above-mentioned control circuit and above-mentioned testing circuit, cut off the power supply of above-mentioned cooling fan supplied with.
(5) when the short circuit that is detected above-mentioned cooling fan by above-mentioned testing circuit is unusual, the unusual output signal of notifying above-mentioned cooling fan is not kept.
(6) when the short circuit that is detected above-mentioned cooling fan by above-mentioned testing circuit is unusual, output, stops (releasing) and notifies above-mentioned anomalous signals when the unusual detection of above-mentioned short circuit disappears the signal of notifying unusually of above-mentioned cooling fan.
(7) comprise the semiconductor switch that carries out break-make control to the power supply supply of above-mentioned cooling fan and by above-mentioned control device in order to cut off; Above-mentioned control device; To begin to the time of breaking off till the above-mentioned semiconductor switch from the unusual detection of the short circuit of above-mentioned cooling fan, be controlled to be being lost in when continuing on-state in the time till the heat damage when being in on-state by above-mentioned semiconductor switch.
In addition; Other type of the present invention is a kind of control method of power inverter; This power inverter comprises the power conversion circuit and the cooling fan that is used for the cooling fin that is equipped with the power semiconductor in this power conversion circuit is cooled off that the alternating electromotive force of variable voltage variable frequency is provided to alternating current motor; Above-mentioned power inverter stops when the temperature detection value of above-mentioned power semiconductor surpasses set point, according to detection the output of the testing circuit of the service voltage of above-mentioned cooling fan is cut off the power supply of above-mentioned cooling fan is supplied with.
And, in this mode, preferably when detecting the short circuit of above-mentioned cooling fan, cut off the power supply of above-mentioned cooling fan supplied with.
According to the present invention, use various the setting in the environment even can provide a kind of, also can realize the ease of use of equipment aspect, be easy to maintain the power inverter of detection.
Description of drawings
Fig. 1 is the main circuit structure figure of power inverter.
Fig. 2 is an example of the allocation plan of the main circuit component of expression power inverter.
Fig. 3 is the sketch map of the power supply supply structure among the main circuit structure figure of expression power inverter.
The sketch map of the circuit that Fig. 4 controls cooling fan for expression.
The sketch map in the safety operation zone of the semiconductor switch that Fig. 5 uses in this execution mode for expression.
The circuit diagram that Fig. 6 controls cooling fan for expression, expression be the example different with Fig. 4.
Embodiment
Can being embodiment to the power inverter that alternating current motor is supplied with the alternating electromotive force of variable voltage variable frequency; To detecting the short trouble of the cooling fan that power inverter possesses, the structure of cutting off the power supply circuit of cooling fan describes.Through cutting off the power supply of cooling fan, just can avoid because the short circuit current that the short trouble of cooling fan causes destroys the secondary that power supply circuit causes.Therefore, just can use the power inverter that can shorten the time that equipment do not operate significantly.Below, utilize accompanying drawing that embodiments of the invention are described.
Fig. 1 is the main circuit structure figure of the power inverter that relates to of the embodiment of the invention.The power inverter of present embodiment; As power conversion circuit; Comprise: alternating electromotive force is converted into the clockwise parallel operation 1, smmothing capacitor 2 of direct current power and direct current power converted into the inverse converter 3 of the alternating electromotive force of optional frequency, can make alternating current motor 4 with desirable frequency run.And, cooling fan 6 is installed in the position that can cool off the power model (power module) in clockwise parallel operation 1 and the inverse converter 3.
The various control datas of power inverter can be set and change from guidance panel 8.But be provided with the display part of display abnormality at guidance panel 8, when detecting power inverter unusual, just it shown at this display part.Though the kind of the guidance panel 8 of present embodiment does not have special qualification, as numeral (digital) guidance panel, consider the device user operability its be set to the structure that in the demonstration that can see display part, can operate.And, though there is no need must display part and guidance panel 8 be provided with as a whole, the preferred integral structure that also can operate when the operator can see demonstration that it is set at guidance panel 8.Be stored the storage part of not expressing in the drawings from the various control datas of the power inverter of guidance panel 8 input.
In addition, also can use to be arranged on power semiconductor modular temperature inside testing circuit 11, serviceability temperature detector 7, temperature sensing circuit 11 are controlled as required.Below, as the device that the temperature that can detect power semiconductor rises, be that representative describes with Temperature Detector 7.
In the present embodiment, control device is by control circuit 5 and drive (driver) circuit 12 formations, is responsible for the whole power inverter of control.Control circuit 5, based on the various control datas through guidance panel 8 inputs, switch (switching) element of control inverse converter 3 is also handled installing the whole necessary control of implementing in addition.Though omitted narration, also carried the microcomputer computer (microprocessor, main control unit) that performs calculations based on information from the storage data in the storage part that stores various control datas to its internal structure.
Fig. 2 is the example of allocation plan of the main circuit component of expression power inverter.In the present embodiment, used the power semiconductor 13 as composite module that positive transducer 1, inverse converter 3 and Temperature Detector 7 are carried in a module, this power semiconductor 13 carries on cooling fin 14.Be used for the cooling fan 6 (being represented by dotted lines at Fig. 2) that cooling fin 14 cools off is installed in above the cooling fin 14.
Because bigger energy loss can take place in power semiconductor 13, so can in the operation process of power inverter, generate heat.The heat that is produced is passed to cooling fin 14 through heat conduction, carry air by cooling fan 6, carries out heat exchange, thereby makes 14 coolings of cooling fin.In the present embodiment, cooling fan 6 makes the back side circulation of the installed surface of the power semiconductor 13 of air on cooling fin 14, thereby the heat that power semiconductor 13 is sent is distributed.
Through this structure, can be to rising to the effect of overtemperature protection on the temperature as the power semiconductor 13 of composite module.
Fig. 3 is in the main circuit structure figure of the power inverter of present embodiment, the power supply supply structure of the drive circuit 12 of the part of formation control part.
In drive circuit 12, be provided with switch voltage-stabilizing circuit 18 as one of circuit structure element.Omission generally is the circuit structure of feedback (Off ラ イ バ Star Network) mode to the detailed introduction of the switch voltage-stabilizing circuit 18 of present embodiment, in each inner structure of power inverter, generates necessary direct voltage.
Specifically; Accept direct voltage (when converter (inverter) AC-input voltage is the 200V level from the smmothing capacitor 2 of the direct-flow intermediate circuit that is present in main circuit; The voltage of smmothing capacitor 2 is direct current 270V), it is generated as the needed direct voltage of each structure.
In power inverter, need multiple direct voltage corresponding to each circuit; For example, 24V (power supply of cooling fan 6, converter and upper interface power supply), 5V (digital circuit power supply such as MCU), ± 12V (analog circuit power supply such as testing circuit), ± 15V (the gate circuit power supply of inverse converter IGBT) etc.
In possessing the power inverter of this spline structure, when the temperature anomaly around this device uprised, the temperature that sucks surrounding air and flow to cooling fan 6 air that sucks of cooling fin 14 itself uprised the cooling effect variation of power semiconductor 13.When through Temperature Detector 7 detected temperature, when being higher than predefined set point, Temperature Detector 7 is on-state.Receive this information, control circuit 5 is presented at " temperature overheating " of power semiconductor 13 display part of guidance panel 8.
But,, also might show " temperature overheating " of the power semiconductor 13 in the power inverter even environment temperature is in the prescribed limit sometimes.Because cooling fan 6 is rotary bodies, so wherein used bearing (bearing) and lubricating grease (grease).The life-span of cooling fan 6 also receives the influence of bearing and lubricating grease.Therefore, through the regular hour, can produce the problem that the rotating speed of cooling fan 6 descends along with the increase of running time.
In addition; By following situation; Being provided with under the situation that environment is a lot of velveteen dust of existence as fibre machinery etc. of power inverter; At places such as cooling fins 14 eyelet can take place and stop up, increase because the pipe loss of said eyelet obstruction causing cooling fin 14 takes place, also cause the rotating speed of cooling fan 6 to reduce.
If the rotating speed of the cooling fan 6 that the power semiconductor 13 as major component is cooled off reduces; Cooling capacity descends; The temperature that equally also possibly be the suction air of cooling fan 6 uprises, and cooling effect reduces, more than predefined temperature; Carry out work, the state of Temperature Detector 7 becomes connection.The temperature overheating that at this moment, also can show the power semiconductor 13 in the power inverter.
And; The set environment of power inverter, if during the situation that fine hair is more and humidity is higher as fibre machinery etc., fine hair can be attached to the inner circuit of cooling fan 6; And the fine hair that is adhered to can absorb moisture, thereby possibly cause the short circuit of cooling fan 6 inside.At this moment,, just do not have cooling effect, can show the temperature overheating of power semiconductor 13 yet because cooling fan 6 breaks down.
Under above-mentioned various situation; The main cause that shows the temperature overheating of power semiconductor 13; Possibly be that environment temperature raises unusually, perhaps, might be along with the prolongation of time variation speed of cooling fan with the running time reduces; Also might be that cooling fan breaks down, its main cause can not judge at once.
When judging when being above-mentioned certain main cause, for example,, following described countermeasure can be arranged when the main cause of the temperature overheating that shows power semiconductor 13 is the rotating speed of cooling fan 6 when descending.That is, reduce at for example 20% o'clock,, can judge the life-span of cooling fan owing to be " unusually lowly " in advance with this data setting if the degree that the rotating speed of cooling fan 6 reduces is an initial rotating speed than said cooling fan 6.
Because from the rotating speed proportional spike train of cooling fan 6 outputs with cooling fan 6; Magnetic pole detecting sensor (sensor) paired pulses row through by cooling fan 6 carry out counting statistics; The rotating speed that can detect cooling fan 6 descends; Under such situation, just can only cooling fan be replaced by new product.Like this, owing to the running time change to wait the cooling fan rotation speed that causes to reduce, be not the inner circuit of cooling fan such fault that is short-circuited, so can not destroy power supply circuit to the cooling fan power supply.
But if the environment that is provided with of power inverter is the more humidity condition with higher of fine hair, then fine hair is attached on the circuit of cooling fan inside and absorb moisture, and the inner circuit of cooling fan might be short-circuited.At this moment cooling fan can produce fault, and the power supply circuit that also can produce cooling fan simultaneously receives the problem of the secondary destruction of short circuit current.
At this moment, be not destroyed, will power inverter be pulled down the cooling fan that only more renews if the user of device finds the power supply circuit of the cooling fan in the power inverter.But; When the power supply of connecting power inverter once more finds that but cooling fan does not rotate; Because the fault of cooling fan, the power supply circuit to the cooling fan power supply that can not judge usually in the power inverter also is destroyed, during this; Equipment quits work, and also can become the reason of production efficiency being brought very big infringement certainly.
In addition; Even the reason in cooling fan life-span also is the comparison difficulty but will judge this reason, is necessary to make equipment to quit work the reason of temperature overheating is judged; Owing to wanting temporary transient arrestment to search the work of reason, make productivity ratio reduce.
Fig. 4 is the sketch map of expression circuit that the cooling fan 6 of present embodiment is controlled.Carry out abnormality detection through this structure to cooling fan 6.In drive circuit 12, be provided with the abnormal detection circuit 17 of the unusual condition that is used to detect cooling fan 6.At first, utilize Fig. 4 that the circuit structure of abnormal detection circuit 17 is described.
The abnormal detection circuit 17 of present embodiment possesses semiconductor switch 9, and control is broken off to the connection of the power supply of cooling fan 6 power supplies.In semiconductor switch 9, for example use transistor, when turning round usually, be on-state.When cooling fan 6 was normal condition, the power supply terminal voltage Vc of cooling fan 6 approximately was about 24V.In addition, though at cooling fan 6 because the variation of operating time etc. and in the state that rotating speed reduces, the power supply terminal voltage Vc of cooling fan 6 also approximately is 24V.
But as stated, owing to the environment that is provided with of power inverter, when cooling fan 6 caused the power supply short circuit faults, the power supply terminal voltage Vc of cooling fan 6 was approximately 0V.That is to say that when cooling fan 6 failed because, the current potential of the power supply terminal voltage Vc of cooling fan 6 is compared with normal condition, demonstrates extremely unusual state.
Here, the abnormal detection circuit of present embodiment possesses comparison circuit 10, and the mensuration current potential of the power supply terminal voltage Vc through keeping watch on cooling fan 6 can detect the short trouble of cooling fan 6.Specifically, be through comparing with the voltage of usefulness relatively, and the result is outputed to control circuit 5 with the power supply terminal voltage Vc (normal condition approximately is 24V) of 10 pairs of cooling fans 6 of comparator.Then; If the output of comparator 10 is sent to the microcomputer MCU of lift-launch on control circuit 5 via input port P1, then microcomputer MCU carries out the semiconductor switch 9 of break-make control usefulness to the power supply 24V of cooling fan 6 based on the output control of comparator 10.
MCU receives the information of cooling fan 6 failed because from the output signal of comparator 10, breaks off semiconductor switch 9.Like this, can cut off power supply circuit, so can protect power supply circuit not destroyed by the secondary of the short circuit current that the short trouble by cooling fan 6 causes to cooling fan 6 power supply.That is,, thereby can suppress the secondary that short trouble causes and destroy according to the break-make of the value control semiconductor switch 9 of the power supply terminal voltage Vc of cooling fan 6.
At this,, should use and be shorted to the matched transistor of its cut-out required time from detecting as semiconductor switch 9.That is, if when short circuit, continue to keep on-state, then semiconductor switch 9 will be by heat damage, so be necessary before semiconductor switch 9 is by heat damage, to transmit from the open command of microcomputer MCU, accomplish and cuts off control.
What Fig. 5 represented is the area of safety operaton of the employed semiconductor switch of present embodiment (transistor).This field, the loss P=V that is taken place under the on-state by transistor
CE* I
C(applying voltage and the product that applies electric current) decision.
The transistor of normal condition, when breaking off, voltage is high between collector emitter, collector current little (usually, being the degree of leakage current).In addition, when connecting, voltage is low between collector emitter, and collector current is big.That is work under such state usually.
But; When unusual as the power supply short circuit fault of cooling fan 6 takes place when; Even transistor is an on-state, also to bear voltage high (moving to the active region) between collector emitter from the zone of saturation, (voltage is high between collector emitter for the such double burden of collector current big (short circuit current); And collector current is big), transistor finally can be because of the loss heat damage of its generation.
If transistor is destroyed, then semiconductor switch 9 loses its function, even therefore detect the generation that short trouble can not prevent that secondary from destroying.
Fig. 5 is the sketch map of expression to the dependency relation of voltage, collector current and application time thereof between the collector emitter of said loss.As shown in Figure 5, for example, if detect the power supply short circuit fault of cooling fan 6, and can be at 1ms with the internal cutting off transistor, then voltage and collector current can be at I between the collector emitter of transistor
C1, C, D, V
CE1Institute's area surrounded is inboard to be used, and can not make the transistor heat damage.
In addition, if transistor is cut off with interior at 100ms, voltage and collector current can be at I between the collector emitter of transistor so
C1, A, F, V
CE1Institute's area surrounded is inboard to be used, and so just can not make the transistor heat damage.
That is to say,, and cut off semiconductor switch (transistor) 9, just can only will cut off to the power supply of cooling fan 6 power supplies if detect the unusual power supply short trouble of cooling fan 6 at once.In other words, when certain single parts takes place when unusual,, just can prevent in advance that secondary from destroying if can only cut off the power supply at unusual position.
Power inverter as present embodiment; Possess acceptance and constitute the switch voltage-stabilizing circuit 18 of service voltage from the direct voltage of smmothing capacitor 2 and to each; From each structure that this switch voltage-stabilizing circuit 18 is supplied with; Through cutting off the supply of the big and cooling fan 6 that place as the life-span element of the voltage supplied with, can significantly improve the reliability of power inverter itself.Specifically, be a kind of through using semiconductor switch 9 that power supply 24V separated structures from main circuit of unusual cooling fan can only will take place, thereby can electrification conversion equipment in the environment be set various.
Through such structure; There is no need to stop the running of main circuit (power converting section of converter etc.) itself; MCU on the control circuit sends the short trouble of cooling fan to guidance panel 8, (for example: the cooling fan short trouble) can on the display of guidance panel 8, demonstrate this mistake.Therefore, it is unusual that the user just can know that the cooling fan 6 that has only in the power inverter takes place, thereby can the equipment dwell time be limited in the Min..
To be expression carry out the circuit diagram of the circuit of control to cooling fan 6 to Fig. 6, expression be the example different with Fig. 4.When cooling fan 6 failed because are unusual, demonstrate and should unusual relevant abnormal show at the display part of guidance panel 8, this is identical with example shown in Figure 4 on the one hand.Different with before embodiment is, this structure can be with the fault output signal Sig1 of the short trouble of cooling fan 6 as alarm (alarm) warning signal from 16 outputs of control terminal platform.
Owing to can take place so the alarm warning signal Sig1 of short trouble supposes the situation of such transience, not keep (latch: latch) also passable because the dust in cooling fan 6 internal circuits causes the situation of transience short circuit.That is, alarm warning signal Sig1 is disengaged.
In addition; The circuit of following structure also can be set in addition; When the short circuit that is detected cooling fan 6 by abnormal detection circuit 17 was unusual, the output signal that 6 generations are notified unusually to cooling fan stopped the signal to notifying unusually when detected short circuit disappears unusually.
Certainly; Because bigger loss takes place the power semiconductor in the power inverter, the heat that causes because of this loss carries out heat conduction to the cooling fin, if through cooling fan the cooling fin is not cooled off; Just can not protect power semiconductor to avoid the heat damage of overheated initiation; So, carry out the temperature overheating protection when the temperature t of Temperature Detector 7 reaches as the temperature that can surpass anything but and during predefined set point T, is necessary to stop power inverter.Promptly; Set point T is set to the temperature that power inverter can not remain in operation again; Control part compares predefined set point T in the storage part of not expressing among the detected temperature t of Temperature Detector 7 and the figure; If t reaches the T value, then, stop its running in order to protect power inverter.
Therefore, when cooling fan 6 breaks down, can realize following running.When cooling fan 6 breaks down, can detect through abnormal detection circuit 17, and, in the content of display part demonstration fault.Thus, the electrification conversion equipment, or use the user of equipment just can recognize the fault of cooling fan 6, and adopt the counter-measure of necessity with this power inverter.
In addition, even without noticing that immediately fault shows, the secondary destruction of causing owing to the fault by cooling fan 6 is prevented from, so can not work the mischief to power inverter and equipment thereof.At this moment, for example, when around temperature low, or situation about turning round with low output etc. under; Even cooling fan 6 breaks down, but,, do not destroy secondary because can not taking place as long as power inverter itself is an operating condition; Even so remain in operation like this, can not hinder to some extent yet.
And, if under the state that cooling fan 6 breaks down, remain in operation, surpass set point T by Temperature Detector 7 detected temperature, then in order to protect power inverter to shut down, power inverter can not damaged.
At this moment; Because what the generating means user did not expect stops; When reason that user's testing fixture stops; Can understand because the fault of cooling fan 6 causes running to be stopped through showing, thereby to change cooling fan and just can solve that the time restriction that can equipment be stopped is in Min..
According to embodiment discussed above, can also obtain following effect.
In the present embodiment, keep watch on the mensuration current potential of the power supply terminal voltage Vc of cooling fans 6 through comparator 10, and receive the information that short trouble has taken place cooling fan from the output signal of comparator 10, MCU makes semiconductor switch 9 break off.Like this, be cut off to the power supply circuit of cooling fan 6 power supply, short circuit current secondary that the short trouble of fan 6 causes destroys therefore can to protect power supply circuit not to be cooled.So, can protect the high price drive circuit 12 that comprises power supply circuit, change drive circuit substrate even under the situation of failed because, also be unlikely to needs.
And; Be provided with the unusual abnormal detection circuits 17 such as short trouble that detect cooling fan 6; When detecting when unusual, the power supply through cutting off cooling fan 6 also shows the unusual of cooling fan 6, can when judging the overheated main cause of power semiconductor 13, use.Therefore, just can judge simply and take what countermeasure or change which kind of element and just can restore, thereby can significantly shorten the time that maintenance time and equipment can not turn round.
Claims (15)
1. power inverter is characterized in that:
Comprise power conversion circuit and the cooling fan that is used for the cooling fin that is equipped with the power semiconductor in this power conversion circuit is cooled off that the alternating electromotive force of variable voltage variable frequency is provided to alternating current motor,
Have the testing circuit of the short circuit that detects this cooling fan, detecting through this testing circuit under the situation of short circuit, cut off the power supply of said cooling fan is supplied with.
2. power inverter according to claim 1 is characterized in that, comprising:
When detecting the short circuit of said cooling fan, show the unusual display part of short circuit by said testing circuit.
3. power inverter according to claim 2 is characterized in that, comprising:
Set the guidance panel of the operating condition of this power inverter, said display part is arranged on this guidance panel.
4. power inverter according to claim 1 is characterized in that:
When detecting the short circuit of said cooling fan, the unusual output signal of notifying said cooling fan is not kept by said testing circuit.
5. power inverter according to claim 1 is characterized in that:
When detecting the short circuit of said cooling fan by said testing circuit, the anomalous signals of the said cooling fan of output notice when the detection of said short circuit disappears, is removed and is notified said anomalous signals.
6. power inverter; Comprise alternating voltage to AC power carry out rectification be converted into direct voltage positive transducer, make the level and smooth smmothing capacitor of the direct voltage of this positive transducer and the direct voltage of said positive transducer converted into the inverse converter of alternating voltage; The alternating electromotive force of this power inverter output variable voltage variable frequency; It is characterized in that, comprising:
The cooling fin that the power semiconductor that constitutes said positive transducer and said inverse converter is cooled off;
Be used to cool off the cooling fan of this cooling fin;
Detect the Temperature Detector of the temperature of said power semiconductor;
Supply with the switch voltage-stabilizing circuit of direct voltage from said smmothing capacitor reception direct voltage and to said cooling fan;
Detection is to the testing circuit of the service voltage of said cooling fan; With
Control device; When surpassing set point, control with the mode that stops power inverter by the temperature that said Temperature Detector detected; And, when detecting the short circuit of said cooling fan by said testing circuit, control to cut off the mode that the power supply of said cooling fan is supplied with.
7. power inverter according to claim 6 is characterized in that, comprising:
When detecting the short circuit of said cooling fan, show the unusual display part of short circuit by said testing circuit.
8. power inverter according to claim 7 is characterized in that, comprising:
Set the guidance panel of the operating condition of this power inverter, said display part is arranged on this guidance panel.
9. power inverter according to claim 6 is characterized in that:
When detecting the short circuit of said cooling fan by said testing circuit, said control device is kept the output of said power inverter and is cut off the power supply of said cooling fan is supplied with.
10. power inverter according to claim 6 is characterized in that:
Said switch voltage-stabilizing circuit is at least to control circuit that comprises said control device and said testing circuit supply power,
When detecting the short circuit of said cooling fan by said testing circuit, keep said power inverter output, supply with to the power supply of said control circuit and said testing circuit, cut off the power supply of said cooling fan supplied with.
11. power inverter according to claim 6 is characterized in that:
When detecting the short circuit of said cooling fan, the unusual output signal of notifying said cooling fan is not kept by said testing circuit.
12. power inverter according to claim 6 is characterized in that:
When detecting the short circuit of said cooling fan by said testing circuit, the anomalous signals of the said cooling fan of output notice when the detection of said short circuit disappears, is removed and is notified said anomalous signals.
13. power inverter according to claim 6 is characterized in that, comprising:
Carry out the semiconductor switch that break-make is controlled in order to cut off to the power supply supply of said cooling fan and by said control device,
Said control device; To begin to the time of breaking off till the said semiconductor switch from the unusual detection of the short circuit of said cooling fan; Be controlled to be in the time till the heat damage; Wherein, said heat damage is the generation loss when being in on-state according to said semiconductor switch and heat damage when continuing on-state.
14. the control method of a power inverter is characterized in that:
This power inverter comprises the power conversion circuit and the cooling fan that is used for the cooling fin that is equipped with the power semiconductor in this power conversion circuit is cooled off that the alternating electromotive force of variable voltage variable frequency is provided to alternating current motor,
Said power inverter stops when the temperature detection value of said power semiconductor surpasses set point,
According to detection the power supply supply to said cooling fan is cut off in the output of the testing circuit of the service voltage of said cooling fan.
15. the control method of power inverter according to claim 14 is characterized in that:
When detecting the short circuit of said cooling fan, cut off the power supply of said cooling fan is supplied with.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006-335249 | 2006-12-13 | ||
| JP2006335249A JP4221436B2 (en) | 2006-12-13 | 2006-12-13 | Power converter |
| JP2006335249 | 2006-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101202515A CN101202515A (en) | 2008-06-18 |
| CN101202515B true CN101202515B (en) | 2012-07-04 |
Family
ID=39517519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101491335A Expired - Fee Related CN101202515B (en) | 2006-12-13 | 2007-09-04 | Electric power convertion device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4221436B2 (en) |
| KR (1) | KR100973369B1 (en) |
| CN (1) | CN101202515B (en) |
| TW (1) | TW200826459A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5114350B2 (en) * | 2008-09-12 | 2013-01-09 | 株式会社日立産機システム | Inverter device |
| WO2010109587A1 (en) * | 2009-03-23 | 2010-09-30 | 東芝三菱電機産業システム株式会社 | Power converter |
| WO2011143087A2 (en) | 2010-05-11 | 2011-11-17 | Carrier Corporation | Chiller motor control system |
| JP5642483B2 (en) * | 2010-09-29 | 2014-12-17 | 三洋電機株式会社 | Inverter device and electric vehicle equipped with the same |
| JP6125287B2 (en) * | 2013-03-21 | 2017-05-10 | 日本電産サンキョー株式会社 | Motor drive device |
| CN104639005A (en) * | 2013-11-07 | 2015-05-20 | 沈阳元生电气有限公司 | Intelligent stepless speed regulation fan |
| WO2015186197A1 (en) * | 2014-06-03 | 2015-12-10 | 三菱電機株式会社 | Control device |
| KR102001287B1 (en) * | 2016-06-23 | 2019-07-17 | 엘지전자 주식회사 | Cooling device and method for controlling the same |
| JP6544322B2 (en) * | 2016-09-05 | 2019-07-17 | 株式会社デンソー | Vehicle lamp controller |
| KR102318722B1 (en) | 2017-03-20 | 2021-10-27 | 엘에스일렉트릭(주) | managing device for cooling inverter |
| JP7166449B2 (en) * | 2019-06-07 | 2022-11-07 | 三菱電機株式会社 | Motor drives, blowers, compressors and air conditioners |
| KR102537776B1 (en) * | 2021-07-21 | 2023-05-31 | 남부산전 주식회사 | Power module with anti-dust function and electric vehicle charging device including the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940000871Y1 (en) * | 1988-06-13 | 1994-02-18 | 삼성항공산업 주식회사 | Inverter |
| JPH07154976A (en) * | 1993-11-30 | 1995-06-16 | Fuji Electric Co Ltd | Operating method of inverter cooling fan |
| JPH08308251A (en) * | 1995-05-11 | 1996-11-22 | Mitsubishi Electric Corp | Inverter cooling circuit |
| JPH09322538A (en) * | 1996-05-30 | 1997-12-12 | Toyo Electric Mfg Co Ltd | Protective circuit of forced-air-cooled power converter |
-
2006
- 2006-12-13 JP JP2006335249A patent/JP4221436B2/en not_active Expired - Fee Related
-
2007
- 2007-08-27 KR KR1020070086298A patent/KR100973369B1/en active IP Right Grant
- 2007-08-28 TW TW096131816A patent/TW200826459A/en not_active IP Right Cessation
- 2007-09-04 CN CN2007101491335A patent/CN101202515B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR100973369B1 (en) | 2010-07-30 |
| CN101202515A (en) | 2008-06-18 |
| TWI350640B (en) | 2011-10-11 |
| JP2008148510A (en) | 2008-06-26 |
| KR20080055601A (en) | 2008-06-19 |
| JP4221436B2 (en) | 2009-02-12 |
| TW200826459A (en) | 2008-06-16 |
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