CN101119097A - Method for suppressing harmonic current of high-power AC motor - Google Patents
Method for suppressing harmonic current of high-power AC motor Download PDFInfo
- Publication number
- CN101119097A CN101119097A CNA2007100698070A CN200710069807A CN101119097A CN 101119097 A CN101119097 A CN 101119097A CN A2007100698070 A CNA2007100698070 A CN A2007100698070A CN 200710069807 A CN200710069807 A CN 200710069807A CN 101119097 A CN101119097 A CN 101119097A
- Authority
- CN
- China
- Prior art keywords
- motor
- power
- phase shifting
- harmonic current
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The present invention discloses a method of restrain the harmonic current of large power AC motor and consists of a DC power supply circuit, a waveform rectification circuit, a power output set circuit, a single chip microprocessor and a two-way controllable silicon moving phase control circuit. In continuous semiwave that follows one by one to supply the AC motor with voltage, different moving phase angle is used for slightly increasing the circuit value of even-numbered resonance wave and to greatly reduce the current of odd-numbered resonance wave. The boundary is to keep the resonance current value within EMC standard; when controlling the two-way controllable silicon moving phase, the phase angel can be moved according to the output power of the motor. Three different phase shifting angles of large, middle and small are adopted and the odd-numbered resonance waveform current value that is produced by restraining the work of motor uses the method of equalizing the medium value of the three phase shifting angles and the needed phase shifting angle. The present invention can make the large power motor to achieve the requirement of resonance waveform current stipulated by the EMC standard by only increasing a small amount of control procedure and with the method of shifting phase and needless of alternating the common motor to achieve the aim of economically employing resources.
Description
Technical field
What the present invention relates to is a kind of method that suppresses harmonic current of high-power AC motor, particularly relates to the method that alternating current machines such as being used for high power vacuum cleaner and electric tool suppresses harmonic current.
Background technology
Advantages such as in exchanging dust catcher and electric tool, extensively the power regulating method that adopts is the controllable silicon phase-shifting control method, and this is a kind of very classical control method, and it has the reliability height, cost is low and the power output gamut is adjustable continuously.But, because this method is by the symmetrical copped wave to alternating current, regulate the supply power voltage of motor, reach the purpose of regulating the motor power output, therefore can produce a certain amount of harmonic current, the odd harmonic electric current is especially obvious.When motor rated power during less than 1400W, the also less energy of its harmonic current can also meet the requirement of EMC standard after tested; But when motor rated power during greater than 1400W, the requirement that odd ripple electric current in its harmonic current just exceeds the EMC standard, at above-mentioned situation, domestic and international many companies have all proposed the method for various inhibition harmonic currents, wherein main has: the asymmetric phase shifting control of continuous all-wave of German KURZ company (be commonly called as two long two short), suppress the method for harmonic current; Meaning method (ST) semiconductor company in continuous three half-waves, adopt two equal little angles of flow to carry out complementary phase shifting control (be commonly called as two long short) in conjunction with a big angle of flow, suppress the method for harmonic current, and provide special integrated circuit; The disclosed patent No. of Chinese patent is " ZL03142104.0 ", " Low harmonic exchange motor controller and control method ", and it is to adopt the method for zero cross fired in conjunction with phase shifting control, suppresses harmonic current; The disclosed application number of Chinese patent is that " 200410069306.9 ", " high power vacuum cleaner speed changer " are to adopt the method for double silicon control in conjunction with tap motor segmentation phase shifting control, suppresses harmonic current.Above several method all can make harmonic wave reach the EMC standard-required, and heavy-duty motor is controlled power of motor output continuously.But above SOME METHODS also respectively is weak, as application number be " 200410069306.9 ", the high power vacuum cleaner speed changer cost higher, the motor manufacturing technology relative complex, and when motor rated power arrives 1800W greatly when above, controllable silicon must be increased again and the motor tap number just can reach the ECM standard-required; The method of other several companies exists the problem of power output instability (motor shake).The patent No. be " ZL03142104.0 ", " Low harmonic exchange motor controller and control method " and ST company method motor rated power during greater than 1600W the motor shake quite obvious, the method of KURZ company motor rated power during greater than 1800W the motor shake quite obvious, so these three kinds of methods all can influence motor useful life.
Summary of the invention
The present invention be directed to above-mentioned the deficiencies in the prior art, a kind of method that suppresses harmonic current of high-power AC motor is provided, to be implemented on the existing bidirectional triode thyristor phase shifting control technical foundation, in conjunction with chip microprocessor and control program, so that the harmonic current value of heavy-duty motor (the highest 2400W) meets the harmonic current value requirement of EMC standard code, and can stably control the purpose of motor power output.
The technical solution used in the present invention is for achieving the above object: the method for this inhibition harmonic current of high-power AC motor, comprise DC power-supply circuit, waveform shaping circuit, power output initialization circuit, chip microprocessor and bidirectional triode thyristor phase-shift control circuit, in the continuous half-wave one by one of supplying with alternating current machine voltage, by with different phase shifting angles, the even-order harmonic current value is increased in a small amount, and the odd harmonic electric current reduces greatly, and being no more than the EMC standard with the harmonic current value is the boundary.
Described when the bidirectional triode thyristor phase shifting control, can be according to the required phase shifting angle of motor power output, adopt large, medium and small three kinds of different phase shifting angles, and the method that equates with required phase shifting angle by the mean value of three phase shifting angles, the odd harmonic current value that the work of inhibition alternating current machine is produced.
The present invention adopts in continuous three half-waves, in given phase shifting angle reference range, adopt different values to carry out the method for phase shifting control phase shifting angle, as long as harmonic current is exceeded the motor power output section of EMC standard-required, employing is adopted the asymmetric control of continuous half-wave to the angle of flow of bidirectional triode thyristor, suppress the harmonic current that motor produced, make the harmonic current value meet the EMC standard-required, and all the other partly still adopt traditional symmetrical expression phase-shifting control method.As long as the present invention is increase controlled step seldom, method with phase shifting control, just can make heavy-duty motor (the highest 2400W) reach the harmonic current requirement of EMC standard code, that is to say and to do any change to common electric machine that the present invention just can reach the purpose that less expensive utilizes resource.
Description of drawings
Fig. 1 alternating supply voltage of the present invention and the curve chart of time.
The electric theory diagram of Fig. 2 control circuit.
Fig. 3 control program flow chart.
Embodiment
Through existing traditional symmetrical chopped mode controllable silicon phase-shift circuit test is found, when phase shifting angle in 90 degree time-harmonic wave current value maximums, seriously exceed the EMC standard-required, toward less than 90 degree or greater than 90 degree directions transfer phase shifting angles then the harmonic current value can obviously reduce.Therefore, constant and one of former and later two phase shifting angle of phase shifting angle in the middle of imagination makes in phase shifting angle is three half-waves that link to each other continuously of 90 degree increase one and reduce, keep average power constant, the harmonic current value is reduced greatly and can stably control the motor power output.Through test, the even-order harmonic current value can increase in a small amount, and the odd harmonic electric current then reduces greatly, illustrates that the method is effective and feasible.
As shown in Figure 1, the alternating supply voltage of exporting to motor from control circuit is sinusoidal wave basically.The phase shifting angle of control circuit when first half-wave is δ 1, the phase shifting angle of second half-wave is δ 2, the phase shifting angle of the 3rd half-wave is δ 3, as can be seen from the figure δ 1＜δ 2＜δ 3, therefore the actual power of exporting when first half-wave is bigger, the actual power of exporting during second half-wave is less, the actual power minimum of exporting during the 3rd half-wave.The phase shifting angle of our hypothetical target power output is 70 degree (but this value root is set at other value by the required power output of reality certainly) in actual applications, the phase shifting angle of first half-wave is 30 degree so, the phase shifting angle of second half-wave is 60 degree, the phase shifting angle of the 3rd half-wave be 120 the degree, such three phase shifting angles and mean value be 70 the degree.In continuous one by one half-wave by adopting different phase shifting angles to be based on above-mentioned already mentioned cognition, adopt different phase shifting angle even-order harmonics slowly to increase and odd harmonic decline rapidly in adjacent half-wave, this is fit to the output control of motor fully.In continuous half-wave, adopt different phase shifting angles that harmonic current of high-power AC motor is reached in the harmonic current limit value of EMC standard code in a word.
Fig. 2 has provided the electric theory diagram of control circuit, entire circuit is by ac power supply, through the DC power-supply circuit output DC, for circuit provides work required DC power supply, waveform shaping circuit converts AC sine wave to square wave, and an input port of waveform shaping circuit and chip microprocessor links; The power output initialization circuit is used to set required motor power output, and the input port of power output initialization circuit and chip microprocessor links; Delivery outlet, circuits for triggering and a bidirectional triode thyristor of chip microprocessor are connected successively.When the level that detects waveform shaping circuit output when chip microprocessor changes, the value that sets by the power output initialization circuit, by the computing of tabling look-up, by the delivery outlet output control trigger impulse that links with circuits for triggering, through the switching of circuits for triggering control bidirectional triode thyristor, to reach the purpose of control motor power output.
Fig. 3 is the flow chart of control program, be preset with phase shift numerical tabular time of delay of three parts of required half-waves of corresponding different output power in the program, the The whole control program at first is that the hardware such as mouth, timer that respectively input or output to chip microprocessor carry out the initial condition setting by job requirement, and the used variablees of control program such as half-wave counter are carried out initial value setting initialize routine partly.Initialize routine finishes the back control program and enters into main program partly, and this part is a cyclic program that moves in circles and carry out.First step chip microprocessor reads in the power output set point from the power output initialization circuit, the output level of the second step chip microprocessor detection waveform shaping circuit, not changing then continuation as level detects, as change explanation alternating voltage zero passage, then the value of half-wave counter adds the value that 1, the three step was a differentiation half-wave counter, judges just sine wave is to be in which half-wave state, value as the half-wave counter is 1, then looks into the 1st half-wave numerical tabular by output power value; Value as the half-wave counter is 2, then looks into the 2nd half-wave numerical tabular by output power value; Otherwise just think the 3rd half-wave, at this moment the value of at first half-wave being counted is clearly zero, look into the 3rd half-wave numerical tabular by output power value then, the 4th step was driven the timer of chip microprocessor inside, the beginning phase shift postpones time of delay, the 5th step judged whether the value of timer is identical with the income value of tabling look-up, then continue to judge as difference, illustrate then that as identical phase shift arrives time of delay, chip microprocessor output trigger impulse, trigger the bidirectional triode thyristor conducting, last control program turns back to the execution that moves in circles of main program porch.Control program can obtain alternating voltage waveform as shown in Figure 1 thus.Adopt the maximum harmonic current result of the measured alternating current machine of method of the present invention by shown in the following subordinate list:
Measure institute's employing standard: EN/IEC61000-3-2A14 (2000) Short cyclic-Equipment class A
Measure used instrument: EM-Test DPA 500
Measure applied voltage: AC 230V 50Hz
Measuring object: the FJ-133 type vacuum cleaner motor power 1600W that NingBo FuJia Industry Co., Ltd produced
| Maximum harmonic current test result | ||||
| The harmonic current number of times | Measured value (A) | Percentage (%) | Standard value (A) | The result |
| 1 | 6.233 | 100.00 | ||
| 2 | 37.696E-3 | 0.605 | 1.08 | By |
| 3 | 1.842 | 29.558 | 2.30 | By |
| 4 | 30.130E-3 | 0.483 | 430.00E-3 | By |
| 5 | 663.686E-3 | 10.649 | 1.14 | By |
| 6 | 24.122E-3 | 0.387 | 300.00E-3 | By |
| 7 | 454.879E-3 | 7.298 | 770.00E-3 | By |
| 8 | 24.321E-3 | 0.390 | 230.00E-3 | By |
| 9 | 244.920E-3 | 3.930 | 400.00E-3 | By |
| 10 | 16.046E-3 | 0.257 | 184.00E-3 | By |
| 11 | 120.724E-3 | 1.937 | 330.00E-3 | By |
| 12 | 9.865E-3 | 0.158 | 153.00E-3 | By |
| 13 | 85.153E-3 | 1.366 | 210.00E-3 | By |
| 14 | 10.934E-3 | 0.175 | 131.00E-3 | By |
| 15 | 67.675E-3 | 1.086 | 150.00E-3 | By |
| 16 | 9.998E-3 | 0.160 | 115.00E-3 | By |
| 17 | 58.475E-3 | 0.938 | 132.00E-3 | By |
| 18 | 8.154E-3 | 0.131 | 102.00E-3 | By |
| 19 | 50.289E-3 | 0.807 | 118.00E-3 | By |
| 20 | 8.744E-3 | 0.140 | 92.00E-3 | By |
| 21 | 50.362E-3 | 0.808 | 107.00E-3 | By |
| 22 | 9.781E-3 | 0.157 | 84.00E-3 | By |
| 23 | 44.899E-3 | 0.720 | 98.00E-3 | By |
| 24 | 9.207E-3 | 0.148 | 77.00E-3 | By |
| 25 | 31.988E-3 | 0.513 | 90.00E-3 | By |
| 26 | 7.332E-3 | 0.118 | 71.00E-3 | By |
| 27 | 37.003E-3 | 0.594 | 83.00E-3 | By |
| 28 | 8.259E-3 | 0.133 | 66.00E-3 | By |
| 29 | 33.533E-3 | 0.538 | 78.00E-3 | By |
| 30 | 7.809E-3 | 0.125 | 61.00E-3 | By |
| 31 | 30.891E-3 | 0.496 | 73.00E-3 | By |
| 32 | 5.982E-3 | 0.096 | 58.00E-3 | By |
| 33 | 16.376E-3 | 0.263 | 68.00E-3 | By |
| 34 | 4.945E-3 | 0.079 | 54.00E-3 | By |
| 35 | 18.788E-3 | 0.301 | 64.00E-3 | By |
| 36 | 6.085E-3 | 0.097 | 51.00E-3 | By |
| 37 | 18.788E-3 | 0.301 | 61.00E-3 | By |
| 38 | 6.085E-3 | 0.098 | 48.00E-3 | By |
| 39 | 20.952E-3 | 0.336 | 58.00E-3 | By |
| 40 | 5.497E-3 | 0.088 | 46.00E-3 | By |
Claims (2)
1. method that suppresses harmonic current of high-power AC motor, comprise DC power-supply circuit, waveform shaping circuit, power output initialization circuit, chip microprocessor and bidirectional triode thyristor phase-shift control circuit, it is characterized in that in the continuous half-wave one by one of supplying with alternating current machine voltage, by with different phase shifting angles, the even-order harmonic current value is increased in a small amount, and the odd harmonic electric current reduces greatly, and being no more than the EMC standard with the harmonic current value is the boundary.
2. the method for inhibition harmonic current of high-power AC motor according to claim 1, it is characterized in that described bidirectional triode thyristor phase shifting control is for the required phase shifting angle of motor power output, adopt large, medium and small three kinds of different phase shifting angles, and the method that the mean value of pressing three phase shifting angles equates with required phase shifting angle suppresses the odd harmonic current value that alternating current machine work is produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100698070A CN101119097A (en) | 2007-06-29 | 2007-06-29 | Method for suppressing harmonic current of high-power AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100698070A CN101119097A (en) | 2007-06-29 | 2007-06-29 | Method for suppressing harmonic current of high-power AC motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101119097A true CN101119097A (en) | 2008-02-06 |
Family
ID=39055068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100698070A Pending CN101119097A (en) | 2007-06-29 | 2007-06-29 | Method for suppressing harmonic current of high-power AC motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101119097A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546085A (en) * | 2013-11-13 | 2014-01-29 | 苏州工业园区艾思科技有限公司 | Constant-power dust collector and control method thereof |
| CN105245095A (en) * | 2014-07-03 | 2016-01-13 | 波音公司 | Design of electromagnetic interference filters for power converter applications |
| CN105373184A (en) * | 2015-11-23 | 2016-03-02 | 九阳股份有限公司 | Power control method for food processor |
-
2007
- 2007-06-29 CN CNA2007100698070A patent/CN101119097A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546085A (en) * | 2013-11-13 | 2014-01-29 | 苏州工业园区艾思科技有限公司 | Constant-power dust collector and control method thereof |
| CN105245095A (en) * | 2014-07-03 | 2016-01-13 | 波音公司 | Design of electromagnetic interference filters for power converter applications |
| US9977858B2 (en) | 2014-07-03 | 2018-05-22 | The Boeing Company | Electromagnetic interference filters for power converter applications |
| CN105373184A (en) * | 2015-11-23 | 2016-03-02 | 九阳股份有限公司 | Power control method for food processor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI430070B (en) | A power factor correction circuit | |
| CN1959583B (en) | Power source apparatus | |
| CN100496849C (en) | High frequency inverted direct-current spot-welding power supply device and its application | |
| CN101841236A (en) | Power factor correction converter and control method thereof | |
| TW202038038A (en) | Totem-pole bridgeless pfc conversion device and method of operating the same | |
| JP2011199976A (en) | Power source unit | |
| CN100382416C (en) | Variable-frequency air-condition power supply power factor correcting device | |
| CN101119097A (en) | Method for suppressing harmonic current of high-power AC motor | |
| CN102231510A (en) | Pulsating DC (direct current) aftercurrent protector and running method thereof | |
| CN110492729B (en) | Circuit for optimizing PF value and THDI of switching power supply and switching power supply | |
| CN108847803B (en) | Variable frequency control circuit, variable frequency air conditioner control circuit and variable frequency air conditioner | |
| WO2024082715A1 (en) | Power conversion system and ripple current suppression method therefor | |
| CN108667316A (en) | Ac-input type Switching Power Supply | |
| CN202261002U (en) | Conduction control circuit with dummy load resistor inside direct-current power supply | |
| CN201374649Y (en) | Power supply circuit and air conditioner provided with same | |
| Saravanan et al. | A novel power factor correction modified bridge less-CUK converter for LED lamp applications | |
| JP2009261143A (en) | Power supply apparatus and air conditioner equipped with the same | |
| CN204063282U (en) | Air-conditioning system | |
| CN100421335C (en) | Method for inhibiting harmonic current | |
| CN216649542U (en) | Power supply circuit and cooking utensil | |
| CN110429811A (en) | A kind of pressure equalizing control method of three-level buck convertor, system and device | |
| CN204231218U (en) | A kind of voltage-doubler rectification output power supply circuit of step-up transformer | |
| CN108828991A (en) | A kind of universal self-adaption constant power heater circuit and its device | |
| CN207638565U (en) | A kind of AC power | |
| TWI469479B (en) | Passive power factor correction circuit, electronic device applying the same and operation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080206 |