CN201063542Y - Phase-shift control device and phase transformer using the same - Google Patents
Phase-shift control device and phase transformer using the same Download PDFInfo
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- CN201063542Y CN201063542Y CNU2007201566074U CN200720156607U CN201063542Y CN 201063542 Y CN201063542 Y CN 201063542Y CN U2007201566074 U CNU2007201566074 U CN U2007201566074U CN 200720156607 U CN200720156607 U CN 200720156607U CN 201063542 Y CN201063542 Y CN 201063542Y
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Abstract
The utility model discloses a phase-shift controller and a phase converter using the phase-shift controller. The phase-shift controller is used for the phase converter; the phase converter comprises: an input unit used to input single-phase input power comprising a first-phase input (L3) and a second-phase input (L1), a three-phase motor used to produce three-phase output power comprising a first-phase output (L3), a second-phase output (L1) and a third-phase output (L2), as well as a phase-shift unit connected between the third-phase output and the first-phase output; the phase-shift controller comprises: a switch unit used to control to charge or discharge the phase-shift unit and connected between the phase-shift unit and the first-phase output, and a control unit which is connected with the first-phase output, the second-phase output, the third-phase output as well as the switch unit and is used to control the switch unit, according to the fact that if the phase of the single-phase input power and the voltage output from the third phase are matched with the voltage output from the first phase or the voltage output from the second phase, to ensure that the charge and discharge to the phase-shift unit are in full-phase synchronization with the single-phase input power.
Description
Technical field
The application relates to a kind of phase shift control device and uses its phase converter, relates in particular to the phase converter that 220/240 volt single phase power supply is transformed into 380/415 volt of three-phase power output of equivalent.
Background technology
In the macroscopic view wiring, single phase poaer supply is much simpler than three phase mains, does not have phase sequence, and the electric wire radical is also less, usually open single phase poaer supply than open three phase mains economy many, so single phase poaer supply is only arranged in a lot of zone, even can only arrange single phase poaer supply.
Than single-phase motor, threephase motor has numerous advantages, such as: volume is few, and starting torque is big, stability of rotation, and load capacity is good, and conversion efficiency is high.So some high accuracy, powerful power consumption equipment, manufacturers are without exception employing three-phase power almost.
Utilize machine to replace hand labor, originally be a much progress of social development, but be difficult to enjoy this progress in the zone of having only single phase poaer supply, the three-phase power consumption equipment is not used in the single phase poaer supply zone, manufacturers also are difficult to push the three-phase power consumption equipment to the single-phase electricity zone, and this is as built partition wall together between manufacturer and user.
This single phase poaer supply is converted to three phase mains, be national energy savings, for the user increases the benefit, be that manufacturer increases choice, becomes the power and the target of research phase converter.
Just had the people making and using phase converter at the fifties, they import single phase poaer supply several capacitor strings and on a threephase motor, and motor can start smoothly.Regard motor as a generator (being the piezoelectric voltage source) this moment again, then can obtain simple three phase mains from the output of motor.This principle people call rotary phase transition principle to it, and this machine is exactly a rotary phase converter the earliest.
Development along with electronics technology; people also progressively improve rotary phase converter; people have utilized the control element of relay, contactor and so on that machine line is carried out observing and controlling; and can regulate automatically; at this moment converter technology is ripe relatively; begin to consider starting current, three-phase equilibrium degree, and protection such as under-voltage, overcurrent, and done effective improvement.
The phse conversion system is the basis with this ordinary skill that used 50 years of rotation transformation (rotary conversion).Traditional phase converter is very simple, as shown in Figure 1, it uses the capacitor of single-phase electricity, transformer and fixed value to produce phse conversion basically, thereby auxiliary three phase electric machine is rotated, in case should rotate by auxiliary threephase motor, start capacitor (startcapacitors) and disconnect, motor has also just become engine, thereby has produced the phase place of disappearance.Can the three-phase electricity that this is quite rough draw, for other equipment provide electric power.
Traditional rotating converter has the defective of aspect of performance always, and they can not overcome effectively with the simple control technology of mechanical conversion and so on.In order to remedy these defectives, rotating converter needs to have big and auxiliary motors several increasings always, with the strong starting current (high starting currents) of reply external loading (externalloads).The result who causes like this is the stable extreme difference of output voltage.
System illustrated in figures 1 and 2 has represented the working condition of early stage phase converter.As shown in Figure 1, phase converter holds power supply to obtain the single-phase alternating current of 220V from client, thereby is connected to the individual event alternating current output that booster transformer provides 380V then.
Then the single phase alternating current (A.C.) of this 380V is electrically connected to the L1 and the L3 terminal of threephase motor.Simultaneously, L1 and L3 will extend to the outgoing position of converter, see figure (L1 output, L3 output), and disappearance is the L2 phase mutually now.This L2 is produced by the 3rd terminal of three phase place motors of this converter inside.When motor internal can correctly be rotated, three power supplys that the L1 of output, L2 and L3 will provide industrial machine to need jointly.
Described motor is correctly rotated and correct L2 phase voltage is provided, must between the terminal of L2 and L3, connect capacitor.The capacitor deactivation motor that required power is very big.Sometimes also need a very little capacitor of power to keep correct 380V L2 power supply output (see figure 2).The size of these capacitors is to decide according to the motor of converter inside and concrete client's industrial machinery power.
Capacitor is worked in the following manner.When half period of sine wave of the voltage of the AC alternating current of input, the capacitor of charging carries out supply of electric power just as a battery to motor.When the half period of AC alternating current at the negative string ripple of voltage, capacitor will discharge to motor.In other words, capacitor is produced ' phase shifts ', and this moving makes L1, L2 and L3 can keep correct phase bit relation, and it can also directly cause motor to rotate (forward/backward) on specific direction simultaneously.
Problem is when machine opens or cuts out, and regular meeting changes the voltage of L2 too much during the supply convertor of these prior aries.
Output voltage can the change significantly along with the variation of load.Capacitor conversion meeting produces many useless electric power spikes (power spike).As a result, the useful life of capacitor and startup/operation contactor is very short.
Summary of the invention
Thereby, in view of the problems referred to above of prior art have been made the application.The application's purpose provides a kind of phase converter, and it can provide stable output voltage, increases to start life of capacitors.
An aspect according to the application, a kind of phase shift control device is provided, this phase shift control device is used for phase converter, and described phase converter comprises: input unit is used for input and contains first input (L3) and the second single-phase input of input (L1) mutually mutually; Threephase motor, be used for producing contain first mutually output (L3), second export (L1) and third phase mutually and exports the three-phase of (L2) and export; Phase-shift unit, described phase-shift unit is connected described third phase output and described first mutually between the output, it is characterized in that, described phase shift control device comprises: switch element, described be used for control described phase-shift unit is carried out charge or discharge, be connected described phase-shift unit and described first and export between the electricity mutually; Control unit, be connected with described first output, described second output mutually mutually, the output of described third phase and described switch element, be used for according to the phase place of described single-phase input electricity and the voltage of described third phase output, control described switch element, make discharging and recharging and the full synchronised of described single-phase input electricity described phase-shift unit.
According to the application on the other hand, a kind of phase shift control device is provided, this phase shift control device is used for phase converter, and described phase converter comprises: input unit is used for input and contains first input (L3) and the second single-phase input of input (L1) mutually mutually; Threephase motor, be used for producing contain first mutually output (L3), second export (L1) and third phase mutually and exports the three-phase of (L2) and export; Phase-shift unit, described phase-shift unit are connected described third phase output and described first mutually between the output, and switch element describedly is used for control described phase-shift unit is carried out charge or discharge, is connected described phase-shift unit and described first and exports between the electricity mutually; It is characterized in that described phase shift control device comprises: voltage monitoring unit, be used to monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and the voltage of described third phase between exporting; The phase place observation circuit is used to monitor the electric phase place of described single-phase input; Switch control unit, be used for according to described voltage monitoring unit monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and described third phase output between voltage judge described third phase output whether with described first mutually output or second mutually output mate, and the phase place of the described single-phase input electricity that goes out according to described judged result and described phase place monitoring circuit monitors, described switch element is controlled, thus control discharging and recharging to described phase-shift unit.
Another aspect according to the application also provides the phase converter that uses above-mentioned phase shift control device.
Should be noted that in this application the existence of parts, step, device etc. only represented in the term of " comprising " and " comprising ", do not get rid of the existence of miscellaneous part, step, device etc., i.e. expression " meaning that includes but not limited to ".
Description of drawings
Fig. 1 is the schematic diagram of a kind of phase converter of prior art;
Fig. 2 is the schematic diagram of the another kind of phase converter of prior art;
Fig. 3 is the schematic diagram according to the phase converter of the application's first embodiment;
Fig. 4 shows the block diagram according to the control unit of the application's a embodiment;
Fig. 5 shows embodiment of voltage conversion circuit;
Fig. 6 shows the schematic diagram of phase monitor unit;
Fig. 7 shows the control flow chart according to the phase shifting control structure of the application's a embodiment;
Fig. 8 shows the schematic diagram according to the phase converter of the application's second embodiment; And
Fig. 9 shows the schematic block diagram according to the control unit of the phase converter of the application's second embodiment.
Embodiment
Below in conjunction with accompanying drawing the application's embodiment is carried out very thin explanation.In whole accompanying drawing, represent identical or similar parts, and omit repeat specification these parts with identical label.
Fig. 3 shows the schematic diagram according to the phase converter of the application's first embodiment.The application's phase converter is with the different of phase converter of prior art illustrated in figures 1 and 2, has substituted startup/operation contactor of Fig. 1 with switch element, and has increased control unit.In this application, this switch element 5 and control unit 6 are generically and collectively referred to as the phase shifting control structure.
Specifically, as shown in Figure 3, phase converter according to an embodiment of the application comprises: input unit 1, be used to import single-phase voltage (for example 220/240 volt single-phase voltage), and also the single-phase voltage of importing is input single-phase electricity or input voltage hereinafter; Step-up transformer 2; Threephase motor 3; Phase shifting equipment 4 and switch element 5, phase shifting equipment 4 and switch element 5 are connected in series between the L2 output and L3 output of threephase motor 3; Control unit 6, be connected between L1 output, L2 output and the L3 output of three phase electric machine 3, and link to each other, be used to measure the voltage of L2 with switch element 5, monitor the phase place of described input single-phase electricity, and switch element 5 is controlled based on voltage that records and the phase place of being monitored; And output unit 7.Output unit 7 is used for the three-phase voltage that the output translator conversion comes.As shown in Figure 3, it comprises the L1 output that is used to export the L1 phase voltage, is used to the L3 output exporting the L2 output of L2 phase voltage and be used to export the L3 phase voltage.With illustrated in figures 1 and 2 identical, wherein the L2 phase voltage is the phase voltage that middle phase (middle phase) voltage generates in other words conj.or perhaps.
In the application's a embodiment, this switch element 5 adopts solid-state silicon controlled rectifier.As shown in Figure 3, in one embodiment, can adopt the switch element of triac as the application.Controllable silicon also claims thyristor (SCR).Certainly, switching device 5 also can be realized by other devices, as relay etc.
In addition, in the application's a embodiment, phase shifting equipment 4 is embodied as capacitor.It can certainly be other phase shifting equipment of realization and capacitor identical function.In addition, though only show an electric capacity (startup electric capacity) among the figure, those skilled in the art should be appreciated that this electric capacity can be by being in series and/or a plurality of electric capacity in parallel are formed.
Introduce the application's control unit 6 below.
Fig. 4 shows the block diagram according to the control unit 6 of the application's a embodiment.As shown in Figure 4, an embodiment according to the application, control unit 6 comprises voltage monitoring unit 61, whether the voltage that is used to monitor between L2 and L1 or the L3 mates, for example can measure voltage and the voltage between L2 and the L3 between L1 and the L2 and compare, whether whether those skilled in the art can adopt voltage that other mode determines L2 to mate with the voltage of L1 or L3; Phase monitor unit 62 is used to monitor the electric phase place (Phase synchronization) of described single-phase input; Switch control unit 63 is used for according to the monitoring result of voltage monitoring unit 61 and the monitoring result of phase monitor unit 62, and the Kai Heguan of switch element is controlled.
Particularly, voltage monitoring unit 61 is used for monitoring the voltage of L2 and L1 or L3, and in the present embodiment, it measures voltage between L1 and the L2 and the voltage between L1 or the L3, and measured voltage is compared.When the voltage between L1 and L2 is lower than the L1 that records or the voltage between the L3 (when the voltage of L2 and the voltage of L3 do not match), and monitoring result according to phase monitor unit 62, single-phase electricity (L1, L3) is when being in positive half period, switch control unit 63 will provide switch controlling signal, capacitor is charged, thereby produce L2 (with the phase place of L1 and the identical voltage of L3) together with threephase motor 3 (effect is to produce the phase angle), three stable electricity outputs are provided.
In addition, threephase motor 3 is all being worked always after machine is opened, and reason is can produce the phase angle by it.
Phase unit monitoring means 62 monitoring exchanges the zero cross point of single-phase input electricity (L1, L3), and (i.e. Zheng Xianbo zero phase zero-phase), and is sent and is represented that voltage enters the positive pulse of positive half period and represents the negative pulse that enters negative half-cycle.Switch control unit 63 is according to the monitoring result of phase monitor unit 62, the sine voltage of judging input signal (being the single-phase input of 220/240V) is in positive half period or negative half-cycle, when positive half period, if the voltage of L2 is less than the voltage of L1 or L3, then unit 5 is controlled diode pair capacitor 4 chargings of control switch unit.The frequency that normal 50Hz alternating current changes polarity is 100 per seconds.When the sine voltage of judging input signal (being the single-phase input of 220/240V) is in negative half-cycle, send control signal, the switch of control switch unit 5, thus make capacitor 4 change into discharge condition from charged state.
In one embodiment, phase monitor unit 62 is realized by optical coupler or photoisolator.In another embodiment, phase monitor unit 62 is formed by optical coupler that is in series and pressure drop unit.Fig. 6 shows the schematic diagram of the phase monitor unit of realization like this.Utilize optical coupler to realize that the measurement (specifically, realizing the monitoring to zero phase) to phase place is well-known to those skilled in the art, thereby do not repeat them here.Further, can be by the measurement of other device realizations known to those skilled in the art to phase place.
Fig. 7 a shows the control flow chart according to the phase shifting control structure of the application's a embodiment.As shown in the figure, in step 701, the phase place of the single-phase input electricity of phase monitor unit 62 monitorings.Subsequently, in step 702, judge whether the single-phase input electricity of this input is in positive half period.If (step 702 not), is then handled and is proceeded to step 703, in step 703, sends switch controlling signal, makes the capacitor discharge, and discharge does not refer to when charging the electricity that was stored in originally in the capacitor is discharged not to be in positive half period.Relatively, be in positive half period (step 702 if judge single-phase input electricity in step 702, be), then whether the voltage of judging L2 in step 704 matches with the voltage of L1 or L3, (consistent) (step 704 if voltage of judging L2 and the voltage of L1 or L3 match, be), then enter step 706.In step 706, do not make capacitor 4 chargings, promptly cut-off switch 5.On the other hand, (step 704 not), is then handled and is entered into step 705, in step 705, makes the electric capacity charging if the voltage of judging the voltage of L2 and L1 or L3 in step 704 mismatches.In this way, control unit 6 carries out monitoring to discharge by control switch unit (silicon controlled rectifier) 5, thereby control puts on the energy level of L2 phase.L1, the phase relation between three kinds of waveforms of L2 and L3 just becomes a kind of function that central three phase electric machine runs well, and real three-phase output has also just realized.
Match and be meant that the difference between the voltage differs in certain scope, for example in 5% scope, comprises on all four situation between the voltage certainly.
It is apparent to those skilled in the art that top flow process is just schematic, also can carry out the judgement whether voltage mates, the judgement that whether has entered positive half period then earlier.Fig. 7 b shows this situation.Shown in Fig. 7 b, in step 701, the voltage of voltage monitoring unit 61 monitoring L2, L1, L3.Subsequently, in step 702, whether the voltage of judging L2 is complementary with the voltage of L1 and L3.If be complementary (step 702 is), then handle and proceed to step 703, in step 703, send switch controlling signal, switch 5 cuts out, promptly, if L2 matches (or consistent) with the voltage of L1, L3, controller cuts out command switch so, does not so just have any charging, discharge process of waiting.In other words, when their voltage of three is identical, the work that capacitor just need not charge, discharge.Relatively, (step 702 not), then judges whether to be in positive half period in step 704, is in positive half period (step 704 is) if judge, and then enters step 706 if the voltage of judging L2 and L1, L3 in step 702 does not match.In step 706, make capacitor 4 chargings.On the other hand,, then handle and enter into step 705,, do not make the electric capacity charging in step 705 if judge to being in positive half period (step 704 denys) in step 704.In this way, control unit 6 by control switch unit (silicon controlled rectifier) 5 carry out to the discharge monitoring, also may command puts on the energy level of L2 phase.L1, the phase relation between three kinds of waveforms of L2 and L3 just becomes a kind of function that central three phase electric machine runs well, and real three-phase output has also just realized.
Conversion capacitor in this way, can be in whole process by the in addition strict control of each sine wave period ground, guaranteeing MIN electromagnetic interference, and can make capacitor have longer life.This is because capacitor will be charged to 380 volts/415 volts sinusoidal wave (real peak-to-peak (peak-to-peak) voltages), so capacitor, diode and silicon controlled rectifier must have the dc voltage value that is equivalent to or surpasses this electric pressure.That is to say that because capacitor can be recharged, thereby capacitor 4, SCR52, diode 51 must have a direct voltage grade to be used for equilibrium or surpass this electric pressure when the real peak value of 380V/415V is sinusoidal wave to crest voltage.And the application's control unit 6 can be made very fast reaction to the change of voltage, thereby can guarantee capacitor circuit can not be connected (in 100 milliseconds) too for a long time, can prolong life of capacitors, and can avoid SCR device or capacitor to be destroyed by impulse current (pulse current).Utilize the application's phase shift control device, can realize to phase-shift unit (as electric capacity) discharge and recharge with as described in the full synchronised of single-phase input electricity.
Fig. 8 shows the schematic diagram according to the phase converter of the application's second embodiment.
The difference of the phase converter of this second embodiment and phase converter shown in Figure 3 is that it has the group that many groups are made up of capacitor and switch element, and has replaced control unit 6 with control unit 6 '.
Be noted that,, it is apparent to those skilled in the art that according to circumstances that 2,3 or more a plurality of (for example 5) this combination can be arranged though figure 8 illustrates the combination of 4 controllable silicons and diode.Have the situation of the combination of 4 controllable silicons and diode in this introduction, the situation with 2,3 or more a plurality of combination is similar with the situation of the combination with 4 controllable silicons and diode.
Fig. 9 shows the schematic block diagram of control unit 6 '.As shown in Figure 9, compare, increased energy level judging unit 64 and selected cell 65 in the control unit 6 ' of Fig. 9 with the control unit of Fig. 4.When different loads is applied to single-phase output to to-three Phase Convertor, the decrease speed difference of the output voltage of three-phase inverter, thereby energy level judging unit 64 can be according to the monitoring result of voltage monitoring unit 61, determine the output voltage decrease speed, and then determine the energy level of load.Selected cell 65 is determined a group or more groups of groups of being made up of described switch element and described capacitor start according to described energy level, and the indicator cock control unit starts and described organizes in the group of being made up of capacitor and switch element one group or more groups more thus.Here the startup of saying is to instigate their participation work.
In Fig. 8, the size of capacitor is included into first-class in large, medium and small and very little this fourth class roughly.Use the various combination of these capacitors, 9 grades of electric capacity can be connected to the L2 phase.These combinations will make the interior motor (internal motor) 3 among Fig. 3 that the voltage level of coupling can arranged between phase and phase.The capacitance of four capacitors is different because of the electric machine of different model.
Because everything occurs in the binary combination, binary combination increases or reduces according to table 1.This process is called tracking (tracking).For example, when machine is just started working,,, then control to make rank progressively be reduced to steady standard along with supply of electric power is stable because current/voltage is big, thereby can reach 7,8 grades.Each step is a very little variation, thereby the load that links to each other with converter (load) will move reposefully.For the machinery of many types, this is very important, because the rapid variation of voltage can impel the normal operation that destroys machinery.In case the micromessage processor is determined output voltage and matches that the tracking combination of capacitor will be locked on that one-level in 5 percent scope.
Particularly, table 1 shows the combined situation of four capacitors among Fig. 8.In table 1, the capacitor that " 0 " representative does not start, the capacitor that " 1 " representative has been started by the micromessage processor.
Table 1
| Grade | Capacitor X8 | Capacitor X4 | Capacitor X2 | Capacitor X1 | Explanation |
| 0 | 0 | 0 | 0 | 0 | Capacitor does not start |
| 1 | 0 | 0 | 0 | 1 | |
| 2 | 0 | 0 | 1 | 0 | |
| 3 | 0 | 0 | 1 | 1 | Apply medium-sized load |
| 4 | 0 | 1 | 0 | 0 | |
| 5 | 0 | 1 | 0 | 1 | |
| 6 | 0 | 1 | 1 | 0 | |
| 7 | 0 | 1 | 1 | 1 | Five-star normal tracking |
| 8 | 1 | 1 | 1 | 1 | The situation of boosting (Boost event) |
0 to 7 grade is the normal tracing area that meets most of loading conditions.8 grades is to leave the very superfine of heavy load for, its mode of operation difference.Relevant 8 grades operation will be carried out more detailed explanation in the back.
When a huge load is applied to single-phase to the output of three-phase inverter the time suddenly, can be used to the output voltage that triggers any particular energy source load will descend very soon, this situation may continue 900 milliseconds (900 milliseconds is example) here, meanwhile uses all capacitor switches that can use and operates the requirement that the sufficient energy of guaranteeing supply guarantees to export the operation that reaches common and successful.
When a machine is connected to the output of converter, may be used as a dead load,, and after sizable energy is consumed, just begin mechanical effect because it comprises heatable element or the mechanical load that starts with stall conditions may be arranged.Large fan or air compressor machine may move in this way.A feature of converter just when voltage rapidly descended, discovered rapidly by huge load, and converter will directly jump grade 8, and all can the be activated energy that provides sufficient of all available capacitors guarantees the startup of huge load during grade 8.Voltage is at any time by close supervision, so in case load motor moves, converter is with the tracking of 0 to 7 grade shown in the rapid recovery table 1.
Because energy grade height very, converter can not keep this state always in 900 milliseconds.If the energy of grade 8 is owing to the machine run failure causes, (having stopped up) such as water pump, the state that a lasting grade 8 just will be arranged then forces other electric wire and parts before circuit breaker work.If load motor started success in the past 900 milliseconds of restrictions.The state of grade 8 stops horse back, promptly enters tracking mode, as above shown in the table.If load motor fails to start in 900 milliseconds, converter will be waited for and attempt to start once more for the second time.If load motor continuous several times (for example 5 times) under the situation of grade 8 all fails to start successfully, that just can not be successful, and at this time converter will shut down and open fault detector.
These characteristics of 8 grades also comprise two safety functions: converter is in this state can only continue 900 milliseconds at the most, because energy level is very high.If the accident of 8 grades of generations is caused by mechanical breakdown, such as the water pump obstruction, the accident of 8 grades of generations continues the burden that will increase the weight of other circuit and parts so, opens circuit until circuit brake.If load motor can start before 900 milliseconds the limit smoothly, the accident of 8 grades of generations will stop immediately.
If motor fails to start within 900 milliseconds, converter can wait for for 2 seconds again, managed to make load (motor) to restart.If 8 grades booster continuous several times is made great efforts (for example five times) afterwards, motor still fails to start up, and so, it just may well successfully not start, so converter will cut out and start fault detector.
The function of converter provides not only clean but also stable three phase mains.As long as AC power is within normal specification requirement scope, just can guarantee to reach above-mentioned functions according to the application's phase converter.For instance, if for the heavy-current cable of converter transmission of electricity very thin very long, perhaps not have sufficient energy be customer load (customer load) power supply to converter so, power converter will be adjusted energy level, so that all phase places match to similar voltage in 5 percent scope, if there are enough energy can reach this purpose.
If what link to each other with converter is a very big threephase load, such as compression pump (compressor pump) or electric fan, converter can be discovered this situation, provides all available energy to start this heavy duty rapidly.In case heavy duty is removed, converter can reduce energy level rapidly.
According to the design of converter, output frequency is always identical with incoming frequency.Because interior motor-locking is on this frequency, the phase shift of three electricity between mutually always is in admirable proportion.
If breaking down in supply of electric power or converter inside, causes very high voltage, converter can be discovered this situation, closes whole system and exempts from possible infringement with protection customer equipment (customer equipment).
In the scope of certain model, power converter has the interior motor of different size.The peak power output of every kind of rating of machine and converter roughly the same (kilowatt to be unit).For instance, interior one eight kilowatt motor of converter can bear 0 to 8 kilowatt outer load.The interior transformer of every converter also is rated for converter rated output power a hundred per cent duty cycle.
The cross dimension of circuit and terminal equipment (terminals) is a hundred per cent electric current expense that choosing can stand up to the converter nominal load in every converter.
Shell, motor and transformer that converter is all and protection property-line point join, and this point links to each other with the protection property-line of service cable (supply cable) again.This protection property-line also extends to all output loadings and device.
Other embodiment
Top example only is schematically, can also comprise following parts or step.
Protective earthing
All converters all have their packing, and motor and transformer have all been received on the end points of protective earthing.This protective earthing also can extend on all output loadings and the device.
Use the radio frequency interference screen pack
Used various strategies that the radio frequency interference degree is controlled within the international standard.Each stage of four capacitor conversion stages has all used and has cast ferrite core (wound ferrite rings) stops radio frequency interference as electrofilter (power filters) emission.This four-stage (across the switching thyristors.) when crossing over the conversion semiconductor rectifier diode has also used radio interference damper (snubber)
Low radio interference electric current contact-making switch
Each supply convertor all has two electromagnetic contactors.The contactor of being responsible for starting is used for guaranteeing carrying out the reasonable reclosing energy in main supply discontinuity.The contactor of being responsible for operation is to be used for guaranteeing that motor built-in before output loading is connected can reach full-speed operation.Each contactor all has a filter capacitor to pass circuitous two contactors of voltage contact of coil arrival and is all had additional braking and transient state protection electric crystal switch (TRIAC) control by one.Guarantee that contact-making switch only just in time uses with crossing under the zero degree phase state at the alternating current sine wave.
The interior direct current requirement of logical memory bank (logic module) is very little, so it is to obtain from 220/240 volt of AC mains power supply of direct rectification.This method can not produce the electric noisiness that the adjustment of any alteration switch waveform voltage brings.The secondary linear regulator at first produces 15 volts of direct current electricity rails (power rail), and it is subjected to further adjusting again, to obtain the usefulness of 5 volts of direct currents for logical program sheet (logic module).
The micromessage processor of control logic memory bank is a kind of have high anti-electric noise acoustic performance, robust device.In the suitable property process of the test of electromagnetism, 8 kilovolts of Electro-Static Discharge tests do not produce the influence that can measure to the running of converter.In addition, the micromessage processor is a characteristic with control circuit in having; It can guarantee the startup once more of program when contingency ruptures (disruption).The program that is included in the micromessage processor is very complicated, and it utilizes point-device logical circuit (logic) and timing function to control all electronic capacitor conversion and external tentaculum.In case the program of enrolling, the coding that is included in the micromessage processor will not be subjected to Cha Suo and plagiarism.
Start and restart security protocol (protocols)
Under normal conditions, logical memory bank is starting " startup " contactor (motor in its startup) before, the bottom line delay in four seconds can be arranged.If find the motor that rotates residual voltage is arranged, this start delay time perhaps can prolong, because all motors must stop operating before startup, this point is extremely important.
In case interior electric motor starting can have the short delay in about 2 seconds again, reaches normal running speed with motor in guaranteeing.This section end time of delay one, the " RUN " Contactor Starting links to each other converter with the load of three-phase customer.
If mains electricity interrupts having only short 300 milliseconds, logical storage is known from experience this situation of discovery, just as top said, opens two contactors, attempts to carry out once logical restarting.This way be in order to ensure any motor that has interrupted and begun reduction of speed not can with the situation of 220/240 volt of supply power voltage out-phase under start once more.
The product practicality
The technology that presents is set forth is developed by the phase converter manufactory under the Australian research company.
The application's power converter can be applicable to (but being not limited to)
Air compressor (all size)
Water under high pressure cutting (fluid power) machine
In sum, the application not only provides a kind of phase shift control device, and a kind of phase shift control method is provided.This method comprises the voltage monitoring step, is used to monitor described first voltage that output, described second is exported mutually and third phase is exported mutually; The phase place monitoring step is used to monitor the electric phase place of described single-phase input; The switch controlled step, be used for described first output and/or described second voltage of output and third phase output mutually mutually of being monitored according to described voltage monitoring step, and the phase place of the described single-phase input electricity that goes out of described phase place monitoring circuit monitors, described switch element is controlled, thus control discharging and recharging to described phase-shift unit.
In one embodiment, when described single-phase input electricity enters positive half period,, then control described switch element, described phase-shift unit is recharged if the voltage of described third phase output exports mutually with described first or second voltage of exporting does not mutually match.
In another embodiment, judge whether described third phase voltage is complementary with described first phase voltage or second phase voltage, if when not being complementary, then when described single-phase input electricity enters positive half period, control described switch element, described phase-shift unit is recharged.
In addition, the application also provides a kind of computer executable program, and described executable program can be realized said method when being carried out by computer or other logical devices.
In addition, the application also provides a kind of computer executable program, and described executable program can make described computer or logical device realize the function of said apparatus when being carried out by computer or other logical devices.
In addition, the application also provides a kind of computer-readable storage medium, is used to store aforementioned calculation machine program.Described storage medium can be any medium that can storage computation machine executable program known to those skilled in the art, includes but not limited to floppy disk, tape, CD, CD-ROM, RAM, VCD, DVD, Flash memory etc.
For the purpose of illustration and description provides above description to the application's exemplary embodiment.This is not intended to carry out exhaustive or the application is limited to disclosed exact form.Be apparent that, many modified examples and change example to this area professional and technical personnel be clearly.For best illustration is carried out in principle and practical application thereof to the application, selection has also been described this exemplary embodiment, makes others skilled in the art can understand the application's various embodiment and the various modified examples that are suitable for desired concrete use thus.Be intended to limit the application's scope by following claim and equivalent thereof.
Claims (17)
1. phase shift control device, this phase shift control device is used for phase converter, and described phase converter comprises:
Input unit is used for input and contains first input (L3) and the second single-phase input of input (L1) mutually mutually;
Threephase motor, be used for producing contain first mutually output (L3), second export (L1) and third phase mutually and exports the three-phase of (L2) and export;
Phase-shift unit, described phase-shift unit are connected described third phase output and described first mutually between the output,
It is characterized in that described phase shift control device comprises:
Switch element, described switch element are used for control described phase-shift unit are carried out charge or discharge, are connected described phase-shift unit and described first and export between the electricity mutually;
Control unit, be connected with described first output, described second output mutually mutually, the output of described third phase and described switch element, be used for whether mating according between the voltage of the phase place of described single-phase input electricity and the output of described third phase and the voltage that described first voltage of exporting mutually or described second is exported mutually, control described switch element, make discharging and recharging and the full synchronised of described single-phase input electricity described phase-shift unit.
2. phase shift control device according to claim 1 is characterized in that, described control unit comprises:
Voltage monitoring unit, be used to monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and the voltage of described third phase between exporting;
The phase place observation circuit is used to monitor the electric phase place of described single-phase input;
Switch control unit, be used for according to described voltage monitoring unit monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and described third phase output between voltage judge described third phase output whether with described first mutually output or second mutually output mate, and the phase place of the described single-phase input electricity that goes out according to described judged result and described phase place monitoring circuit monitors, described switch element is controlled, thus control discharging and recharging to described phase-shift unit.
3. phase shift control device according to claim 2, it is characterized in that, the electric phase place of described single-phase input that described switch control unit goes out according to described phase place monitoring circuit monitors, when described single-phase input electricity enters positive half period, if the voltage of described third phase output exports mutually with described first or second voltage of exporting does not mutually match, then control described switch element, described phase-shift unit is recharged.
4. phase shift control device according to claim 2, it is characterized in that, the voltage that described switch control unit is monitored out according to described voltage monitoring unit, judge whether described third phase voltage is complementary with described first phase voltage or second phase voltage, if when not being complementary, then when described single-phase input electricity enters positive half period, control described switch element, described phase-shift unit is recharged.
5. phase shift control device according to claim 2 is characterized in that described phase monitor unit comprises photoelectrical coupler.
6. phase shift control device according to claim 5 is characterized in that, described phase monitor unit also comprises the pressure drop unit that links to each other with described photoelectrical coupler.
7. phase shift control device according to claim 2 is characterized in that described switch element is a triac.
8. phase shift control device, this phase shift control device is used for phase converter, and described phase converter comprises:
Input unit is used for input and contains first input (L3) and the second single-phase input of input (L1) mutually mutually;
Threephase motor, be used for producing contain first mutually output (L3), second export (L1) and third phase mutually and exports the three-phase of (L2) and export;
Phase-shift unit, described phase-shift unit are connected described third phase output and described first mutually between the output,
Switch element, described switch element are used for control described phase-shift unit are carried out charge or discharge, are connected described phase-shift unit and described first and export between the electricity mutually;
It is characterized in that described phase shift control device comprises:
Voltage monitoring unit, be used to monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and the voltage of described third phase between exporting;
The phase place observation circuit is used to monitor the electric phase place of described single-phase input;
Switch control unit, be used for according to described voltage monitoring unit monitor described first mutually output and described second mutually the voltage, described first between the output export mutually and described third phase output between voltage judge described third phase output whether with described first mutually output or second mutually output mate, and the phase place of the described single-phase input electricity that goes out according to described judged result and described phase place monitoring circuit monitors, described switch element is controlled, thus control discharging and recharging to described phase-shift unit.
9. phase shift control device according to claim 8, it is characterized in that, the electric phase place of described single-phase input that described switch control unit goes out according to described phase place monitoring circuit monitors, when described single-phase input electricity enters positive half period, if the voltage of described third phase output between output or second is exported mutually mutually with described first does not match, then control described switch element, described phase-shift unit is recharged.
10. phase shift control device according to claim 8, it is characterized in that, the voltage that described switch control unit is monitored out according to described voltage monitoring unit, judge whether described third phase voltage is complementary with described first phase voltage or second phase voltage, if when not being complementary, then when described single-phase input electricity enters positive half period, control described switch element, described phase-shift unit is recharged.
11. phase shift control device according to claim 8 is characterized in that described phase monitor unit comprises photoelectrical coupler.
12. phase shift control device according to claim 8 is characterized in that, described phase converter comprises the group that many groups are made up of described switch element and described phase-shift unit, and described phase shift control device also comprises:
Energy level judging unit, described energy level judging unit are used to judge the energy level of the load of described phase converter;
Selected cell according to the energy level that described energy level judgment unit judges goes out, is selected should start a group or more groups in the group that described many groups are made up of described switch element and described phase-shift unit,
Described switch control unit carries out switch control to selected described one group or more groups of described selected cell.
13. phase shift control device according to claim 12, it is characterized in that, described energy level judging unit comprises the pressure drop monitoring means, described pressure drop monitoring means is monitored the decrease speed of output voltage, and described energy level judging unit is judged the energy level of the load of described phase converter according to the decrease speed of described output voltage.
14. according to claim 12 or 13 described phase shift control device, it is characterized in that, described phase shift control device comprises timing unit, to gone out load by described energy level judgment unit judges is duration of the state of high level to carry out timing, if described timing has surpassed the scheduled time, then described selected cell is reselected groups or more groups of organizing in the group of being made up of described switch element and described phase-shift unit according to load for the low-lying level state more.
15. according to claim 12 or 13 described phase shift control device, it is characterized in that, described phase shift control device comprises load enabling counting unit, described load enabling counting unit is counted the load number of starts within a certain period of time, when the described number of starts surpasses predetermined value, end the startup of described load.
16. a phase converter, described phase converter comprises:
Input unit is used for input and contains first input (L3) and the second single-phase input of input (L1) mutually mutually;
Threephase motor, be used for producing contain first mutually output (L3), second export (L1) and third phase mutually and exports the three-phase of (L2) and export;
Phase-shift unit, described phase-shift unit are connected described third phase output and described first mutually between the output,
Switch element, described switch element are used for control described phase-shift unit are carried out charge or discharge, are connected described phase-shift unit and described first and export between the electricity mutually;
It is characterized in that described phase converter also comprises according to Claim 8-15 each described phase shift control device.
17. phase converter according to claim 16 is characterized in that, described phase converter comprises filter unit, be connected described second mutually the input and described phase-shift unit between, be used for the radio interference of filtering from described phase converter outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201566074U CN201063542Y (en) | 2007-07-10 | 2007-07-10 | Phase-shift control device and phase transformer using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201566074U CN201063542Y (en) | 2007-07-10 | 2007-07-10 | Phase-shift control device and phase transformer using the same |
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| Publication Number | Publication Date |
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| CN201063542Y true CN201063542Y (en) | 2008-05-21 |
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| CNU2007201566074U Expired - Fee Related CN201063542Y (en) | 2007-07-10 | 2007-07-10 | Phase-shift control device and phase transformer using the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847905A (en) * | 2009-03-23 | 2010-09-29 | 安徽聚隆机械有限公司 | Direct-drive disc type motor for full-automatic pulsator washing machine and installation method |
| CN102255553A (en) * | 2010-05-21 | 2011-11-23 | 安奕极电源系统有限责任公司 | Device for distribution of firing pulses, circuit arrangement and procedure for sequence control |
| CN106981869A (en) * | 2016-01-19 | 2017-07-25 | 古德里奇公司 | Three-phase power for earth-free wye-circuit is switched |
-
2007
- 2007-07-10 CN CNU2007201566074U patent/CN201063542Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847905A (en) * | 2009-03-23 | 2010-09-29 | 安徽聚隆机械有限公司 | Direct-drive disc type motor for full-automatic pulsator washing machine and installation method |
| CN102255553A (en) * | 2010-05-21 | 2011-11-23 | 安奕极电源系统有限责任公司 | Device for distribution of firing pulses, circuit arrangement and procedure for sequence control |
| CN106981869A (en) * | 2016-01-19 | 2017-07-25 | 古德里奇公司 | Three-phase power for earth-free wye-circuit is switched |
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