CN103684001B - The control method of power switch and device in convertible frequency air-conditioner - Google Patents
The control method of power switch and device in convertible frequency air-conditioner Download PDFInfo
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- CN103684001B CN103684001B CN201210343873.3A CN201210343873A CN103684001B CN 103684001 B CN103684001 B CN 103684001B CN 201210343873 A CN201210343873 A CN 201210343873A CN 103684001 B CN103684001 B CN 103684001B
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Abstract
The embodiment of the present invention provides control method and the device of power switch in a kind of convertible frequency air-conditioner, calculate pole tension according to three-phase voltage, and described pole tension is loaded on power switch, realize the control to power switch, compared with existing power switch control method, described method directly utilizes pole tension to realize the control to power switch upper and lower bridge arm closure or conducting, because pole tension calculates according to three-phase voltage, thereby the upper and lower bridge arm that makes power switch has certain conducting or closed retention time in whole voltage cycle, but not whole voltage cycle all moves, so reduced the on-off times of power switch, the wearing and tearing of power switch are alleviated.
Description
Technical field
The present invention relates to control field, relate in particular to control method and the device of power switch in convertible frequency air-conditioner.
Background technology
At present, the use of convertible frequency air-conditioner is more and more frequent, and the SPM of convertible frequency air-conditioner is its corePart, SPM comprises power switch, the common usage space electricity of power switch of convertible frequency air-conditionerPress vector pulse duration modulation method to control, that is: judge definite sector adjacent voltage vector by sectorBasic ON time, power ratio control switch I GBT holds in the whole phase voltage cycle incessantly according to dutycycleRow turns on and off, so, cause the on-off times of power switch IGBT frequent, easily wear and tear,Therefore can affect the service life of air-conditioning.
Summary of the invention
In view of this, the invention provides a kind of control method and device of power switch of convertible frequency air-conditioner,Object is the control method of the power switch that the solves existing convertible frequency air-conditioner power switch that easily weares and teares, fromAnd affect the problem in the service life of air-conditioning.
To achieve these goals, the embodiment of the present invention provides following technical scheme:
A control method for convertible frequency air-conditioner power switch, comprising:
Judge whether to meet default condition;
In the time meeting default condition, be three-phase voltage by the voltage transitions under two-phase rotating coordinate system;
According to described three-phase voltage and default computation rule, calculate pole tension;
Described pole tension is supplied with to described power switch, realize the control to described power switch.
Preferably, the described three-phase voltage of described foundation and default computation rule, calculate pole tension and comprise:
The relatively size of three-phase voltage described in current time, determines described in current time in three-phase voltageLarge magnitude of voltage, minimum voltage value and intermediate voltage value;
Calculate described maximum voltage value and described minimum voltage value and;
When described maximum voltage value and described minimum voltage value and while being more than or equal to zero, determine the described utmost pointVoltage is the poor of default value and described maximum voltage value;
When described maximum voltage value and described minimum voltage value and while being less than zero, determine that described pole tension isDefault value and described minimum voltage value poor.
Preferably, described default value comprises:
The half of bus voltage value.
Preferably, described default condition comprises:
Outdoor environment temperature is greater than default temperature value.
Preferably, described default condition comprises:
Empty condition.
A control device for convertible frequency air-conditioner power switch, comprising:
Judge module, for judging whether to meet default condition;
Voltage transformation module, in the time meeting default condition, by the voltage under two-phase rotating coordinate systemBe converted to three-phase voltage;
Computing module, for according to described three-phase voltage and default computation rule, calculates pole tension;
Control module, for described pole tension is supplied with to described power switch, realizes described power switchControl.
Preferably, described computing module comprises:
Comparing unit, for the size of three-phase voltage described in comparison current time, determines described in current timeMaximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage;
Addition unit, for calculate described maximum voltage value and described minimum voltage value and;
Pole tension determining unit, for when described maximum voltage value and described minimum voltage value be more than or equal to, determine that described pole tension is the poor of default value and described maximum voltage value at 1 o'clock; When described maximum voltageValue and described minimum voltage value and be less than at 1 o'clock, determine that described pole tension is default value and described minimumMagnitude of voltage poor.
The control method of power switch and device in convertible frequency air-conditioner described in the embodiment of the present invention, according to three-phasePotentiometer calculates pole tension, and described pole tension is loaded on power switch, realizes the control to power switchSystem, compared with existing power switch control method, described method directly utilizes pole tension to realize powerThe control of switch upper and lower bridge arm closure or conducting, because pole tension calculates according to three-phase voltage, therebyWhile making the upper and lower bridge arm of power switch there is certain conducting or closed maintenance in whole voltage cycleBetween, but not whole voltage cycle all moves, so reduced the on-off times of power switch, alleviatesThe wearing and tearing of power switch.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, apparently, belowAccompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,Do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow process of the control method of the power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present inventionFigure;
Fig. 2 is foundation in the control method of power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present inventionDescribed three-phase voltage and default computation rule, the flow chart of the method for calculating pole tension;
Fig. 3 calculates in the control method of power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present inventionDesign sketch after the pole tension supply power switch going out;
Fig. 4 is that the power switch control method described in traditional power switch control method and the present embodiment is ledThe power switch conducting causing or the schematic diagram of closed number of times;
Fig. 5 is that the structure of the control device of the disclosed a kind of convertible frequency air-conditioner power switch of the embodiment of the present invention is shownIntention;
Fig. 6 calculates mould in the control device of the disclosed a kind of convertible frequency air-conditioner power switch of the embodiment of the present inventionThe structural representation of piece.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried outDescribe clearly and completely, obviously, described embodiment is only the present invention's part embodiment, andNot whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not doingGo out the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of control method of power switch of convertible frequency air-conditioner, as shown in Figure 1,Comprise:
S101: judge whether to meet default condition;
S102: in the time meeting default condition, be three-phase electricity by the voltage transitions under two-phase rotating coordinate systemPress;
In the time not meeting default condition, finish.
S103: according to described three-phase voltage and default computation rule, calculate pole tension;
Described pole tension is the terminal voltage of supply power switch.
Concrete computational process as shown in Figure 2, can comprise:
S201: the relatively size of three-phase voltage described in current time, determine three-phase voltage described in current timeIn maximum voltage value, minimum voltage value and intermediate voltage value;
In the present embodiment, maximum voltage value is designated as to Vmax, minimum voltage value is designated as to Vmin, by medium voltageValue is designated as Vmid。
S202: calculate described maximum voltage value and described minimum voltage value and;
Calculate Vmax+Vmin。
S203: judge Vmax+VminWhether be less than zero;
S204: when described maximum voltage value and described minimum voltage value and while being more than or equal to zero, determineDescribed pole tension is the poor of default value and described maximum voltage value;
The default preferred busbar voltage of value in the present embodiment, is designated as VDC, i.e. pole tension
S205: when described maximum voltage value and described minimum voltage value and while being less than zero, determine the described utmost pointVoltage is the poor of default value and described minimum voltage value, i.e. pole tension
S104: described pole tension is supplied with to described power switch, realize the control to described power switch.
From the computation rule of above-mentioned pole tension, after the pole tension supply power switch calculating, causeDirect effect as shown in Figure 3, a voltage cycle is divided into 6 equal portions, each in the front and back that comprise crestIn 30 degree intervals, the upper brachium pontis of power switch is always in conducting state, and each in the front and back that comprise troughIn 30 degree intervals, the lower brachium pontis of power switch always in conducting state, that is to say, is comprising crestOr in the interval of trough, the brachium pontis of power switch keeps conducting state, voltage cycle comprise 2 thisThe interval of sample, so in a voltage cycle, power switch is spent in interval in keeping at 2 60Conducting state, so compared with existing control method, reduced by 1/3rd on-off times.
Fig. 4 is that the power switch control method described in traditional power switch control method and the present embodiment is ledThe power switch conducting causing or the schematic diagram of closed number of times, wherein SVPWM method is that traditional power is openedClose control method, visible, use SVPWM method at whole voltage cycle power switch incessantlyMove, as shown in 401, and use the method described in the present embodiment, there is the non-action of power switchThe interval 402 of (conducting or closed maintenance).
From above-mentioned analysis, the method described in the present embodiment, calculates pole tension according to three-phase voltage,And by described pole tension supply power switch, realize and having forced respectively near the crest and trough of phase voltageTwo 60 degree release of section or stopcocks, power switch loss is reduced to 1/3, compressor still can be put downSteady operation, thereby the wearing and tearing that alleviated power switch, and saved electric energy.
Further, described in the present embodiment, default condition is specially:
Outdoor environment temperature is greater than default temperature value, when outdoor environment temperature is greater than default temperature valueTime, carry out the above-mentioned control method to power switch, be not more than default temperature and work as outdoor environment temperatureWhen value, can use the control method of traditional power switch.
Or default condition can be empty condition, no matter outdoor temperature how, in convertible frequency air-conditioner, beginUse eventually the control method of power switch in the present embodiment.
In actual use, can select default condition according to different demands, not limit here.
Embodiment is corresponding with said method, the embodiment of the invention also discloses a kind of convertible frequency air-conditioner powerThe control device of switch, as shown in Figure 5, comprising:
Judge module 501, for judging whether to meet default condition;
Voltage transformation module 502, in the time meeting default condition, by the electricity under two-phase rotating coordinate systemPressure is converted to three-phase voltage;
Computing module 503, for according to described three-phase voltage and default computation rule, calculates pole tension;
Control module 504, for described pole tension is supplied with to described power switch, realizes described power is openedThe control of closing.
The course of work of installing described in the present embodiment is: judge module judges whether to meet default condition,If so, voltage transformation module is three-phase voltage by the voltage transitions under two-phase rotating coordinate system, calculates mouldPiece, according to described three-phase voltage and default computation rule, calculates pole tension, and control module supplies pole tensionGive described power switch, realize the control to described power switch.
Device described in the present embodiment, comprises and calculates the computing module of pole tension and described pole tension is supplied withDescribed power switch, the control module of realization to described power switch control, realized and having forced respectively in phaseSpend release of section or stopcock, power switch loss is fallen for two 60 near the crest of voltage and troughLow by 1/3, compressor still can even running, thus the wearing and tearing that alleviated power switch, and saved electric energy.
Further, computing module as shown in Figure 6, comprising described in the present embodiment:
Comparing unit 601, for the size of three-phase voltage described in comparison current time, determines current time instituteState maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage;
Addition unit 602, for calculate described maximum voltage value and described minimum voltage value and;
Pole tension determining unit 603, for when described maximum voltage value and described minimum voltage value be greater thanOr while equalling zero, determine that described pole tension is the poor of default value and described maximum voltage value; When describedLarge magnitude of voltage and described minimum voltage value be less than at 1 o'clock, determine value and the institute of described pole tension for presettingState the poor of minimum voltage value.
In this description, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stressesBe and the difference of other embodiment, between each embodiment same or similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field can be realized or useThe present invention. To be aobvious and easy for those skilled in the art to the multiple amendment of these embodimentSee, General Principle as defined herein can be in the situation that not departing from the spirit or scope of the present invention,Realize in other embodiments. Therefore, the present invention will can not be restricted to these embodiment shown in this article,But to meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a control method for convertible frequency air-conditioner power switch, is characterized in that, comprising:
Judge whether to meet default condition;
In the time meeting default condition, be three-phase voltage by the voltage transitions under two-phase rotating coordinate system;
According to described three-phase voltage and default computation rule, calculate pole tension;
Described pole tension is supplied with to described power switch, realize the control to described power switch;
Wherein, the described three-phase voltage of described foundation and default computation rule, calculate pole tension and comprise:
The relatively size of three-phase voltage described in current time, determines described in current time in three-phase voltageLarge magnitude of voltage, minimum voltage value and intermediate voltage value;
Calculate described maximum voltage value and described minimum voltage value and;
When described maximum voltage value and described minimum voltage value and while being more than or equal to zero, determine the described utmost pointVoltage is the poor of default value and described maximum voltage value;
When described maximum voltage value and described minimum voltage value and while being less than zero, determine that described pole tension isDefault value and described minimum voltage value poor.
2. method according to claim 1, is characterized in that, described default value comprises:
The half of bus voltage value.
3. method according to claim 1, is characterized in that, described default condition comprises:
Outdoor environment temperature is greater than default temperature value.
4. method according to claim 1, is characterized in that, described default condition comprises:
Empty condition.
5. a control device for convertible frequency air-conditioner power switch, is characterized in that, comprising:
Judge module, for judging whether to meet default condition;
Voltage transformation module, in the time meeting default condition, by the voltage under two-phase rotating coordinate systemBe converted to three-phase voltage;
Computing module, for according to described three-phase voltage and default computation rule, calculates pole tension;
Control module, for described pole tension is supplied with to described power switch, realizes described power switchControl;
Wherein, described computing module comprises:
Comparing unit, for the size of three-phase voltage described in comparison current time, determines described in current timeMaximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage;
Addition unit, for calculate described maximum voltage value and described minimum voltage value and;
Pole tension determining unit, for when described maximum voltage value and described minimum voltage value be greater than orWhile equalling zero, determine that described pole tension is the poor of default value and described maximum voltage value; When described maximumMagnitude of voltage and described minimum voltage value and be less than at 1 o'clock, determine described pole tension be default value with described inMinimum voltage value poor.
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| CN201210343873.3A CN103684001B (en) | 2012-09-17 | 2012-09-17 | The control method of power switch and device in convertible frequency air-conditioner |
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Citations (3)
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| CN101958659A (en) * | 2009-07-20 | 2011-01-26 | 通用电气公司 | Be used for direct current power is converted to system, the method and apparatus of alternating electromotive force |
| CN102195505A (en) * | 2010-03-17 | 2011-09-21 | 通用汽车环球科技运作有限责任公司 | Use of discontinuous pulse width modulation for an inverter coupled to an electric motor for a vehicle |
| CN102570882A (en) * | 2010-12-26 | 2012-07-11 | 岳凡 | Maximum linear output pulse width modulation of current transformer |
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| US7190143B2 (en) * | 2005-05-27 | 2007-03-13 | Rockwell Automation Technologies, Inc. | Pulse width modulation (PWM) rectifier with variable switching frequency |
| US7649756B2 (en) * | 2006-05-17 | 2010-01-19 | Rockwell Automation Technologies, Inc. | Common mode noise reduction in converter systems through modification of single phase switching signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958659A (en) * | 2009-07-20 | 2011-01-26 | 通用电气公司 | Be used for direct current power is converted to system, the method and apparatus of alternating electromotive force |
| CN102195505A (en) * | 2010-03-17 | 2011-09-21 | 通用汽车环球科技运作有限责任公司 | Use of discontinuous pulse width modulation for an inverter coupled to an electric motor for a vehicle |
| CN102570882A (en) * | 2010-12-26 | 2012-07-11 | 岳凡 | Maximum linear output pulse width modulation of current transformer |
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