CN103684001A - Method and device for controlling power switch in frequency-variable air conditioner - Google Patents
Method and device for controlling power switch in frequency-variable air conditioner Download PDFInfo
- Publication number
- CN103684001A CN103684001A CN201210343873.3A CN201210343873A CN103684001A CN 103684001 A CN103684001 A CN 103684001A CN 201210343873 A CN201210343873 A CN 201210343873A CN 103684001 A CN103684001 A CN 103684001A
- Authority
- CN
- China
- Prior art keywords
- voltage value
- power switch
- default
- value
- pole tension
- 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.)
- Granted
Links
Images
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
The embodiments of the invention provide a method and device for controlling a power switch in a frequency-variable air conditioner. A gate voltage is calculated based on a three-phase voltage and the gate voltage is loaded onto the power switch to achieve the effect of controlling the power switch. Compared with the existing power switch control method in the prior art, the method directly utilizes a gate voltage to achieve the effect of controlling the switch-on/-off of upper/lower arms of a power switch, and as the gate voltage is calculated based on a three-phase voltage, the upper/lower arms of the power switch have a certain switch-on/-off retention time during the whole voltage period rather than acting always during the whole voltage period, as a result, the switch-on/-off frequency of the power switch is reduced, and the wear damage of the power switch is reduced.
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, the Intelligent Power Module of convertible frequency air-conditioner is its core, Intelligent Power Module comprises power switch, the common usage space voltage vector of the power switch pulse duration modulation method of convertible frequency air-conditioner is controlled, that is: by sector, judge the basic ON time of determining the adjacent voltage vector in sector, power ratio control switch I GBT carries out and turns on and off incessantly in the whole phase voltage cycle according to duty ratio, so, cause the on-off times of power switch IGBT frequent, easily wear and tear, therefore can affect the useful 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, the control method that object is to solve the power switch of the existing convertible frequency air-conditioner power switch that easily weares and teares, thus affect the problem in the useful 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;
When meeting default condition, by the voltage transitions under two-phase rotating coordinate system, be three-phase voltage;
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 size of three-phase voltage described in current time relatively, determines maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
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 that described pole tension 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 is the poor of default value and described minimum voltage value.
Preferably, described default value comprises:
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, for when meeting default condition, is three-phase voltage by the voltage transitions under two-phase rotating coordinate system;
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 the control to described power switch.
Preferably, described computing module comprises:
Comparing unit, for the size of three-phase voltage described in current time relatively, determines maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
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 and while being more than or equal to zero, determine that described pole tension 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 is the poor of default value and described minimum voltage value.
The control method of power switch and device in convertible frequency air-conditioner described in the embodiment of the present invention, according to three-phase voltage, calculate pole tension, and described pole tension is loaded on power switch, the control of realization to power switch, compare 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 have been alleviated.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, 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 chart of control method of the power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present invention;
Fig. 2 be in the control method of power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present invention according to described three-phase voltage and default computation rule, calculate the flow chart of the method for pole tension;
Fig. 3 is the design sketch after the pole tension supply power switch calculating in the control method of power switch of the disclosed a kind of convertible frequency air-conditioner of the embodiment of the present invention;
Fig. 4 is the power switch conducting that causes of traditional power switch control method and the power switch control method described in the present embodiment or the schematic diagram of closed number of times;
Fig. 5 is the structural representation of the control device of the disclosed a kind of convertible frequency air-conditioner power switch of the embodiment of the present invention;
Fig. 6 is the structural representation of computing module in the control device of the disclosed a kind of convertible frequency air-conditioner power switch of the embodiment of the present invention.
Embodiment
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, 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, comprising:
S101: judge whether to meet default condition;
S102: when meeting default condition, be three-phase voltage by the voltage transitions under two-phase rotating coordinate system;
When 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 size of three-phase voltage described in current time relatively, determine maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
In the present embodiment, maximum voltage value is designated as to V
max, minimum voltage value is designated as to V
min, intermediate voltage value is designated as to V
mid.
S202: calculate described maximum voltage value and described minimum voltage value and;
Calculate V
max+ V
min.
S203: judgement V
max+ V
minwhether be less than zero;
S204: when described maximum voltage value and described minimum voltage value and while being more than or equal to zero, determine that described 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 V
dC, i.e. pole tension
S205: when described maximum voltage value and described minimum voltage value and while being less than zero, determine that described pole tension 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.
Computation rule from above-mentioned pole tension, after the pole tension supply power switch calculating, the direct effect causing as shown in Figure 3, a voltage cycle is divided into 6 equal portions, in each 30 degree interval, the front and back that comprise crest, the upper brachium pontis of power switch is always in conducting state, and in each 30 degree interval, the front and back that comprise trough, the lower brachium pontis of power switch is always in conducting state, that is to say, in the interval that comprises crest or trough, the brachium pontis of power switch keeps conducting state, a voltage cycle comprises 2 such intervals, so, in a voltage cycle, power switch is spent in interval in keeping conducting state at 2 60, so compare with existing control method, reduced by 1/3rd on-off times.
Fig. 4 is the power switch conducting that causes of traditional power switch control method and the power switch control method described in the present embodiment or the schematic diagram of closed number of times, wherein SVPWM method is traditional power switch control method, visible, use SVPWM method moving incessantly at whole voltage cycle power switch, as shown in 401, and method described in use the present embodiment has the non-action of the power switch interval 402 of (conducting or closed maintenance).
From above-mentioned analysis, method described in the present embodiment, according to three-phase voltage, calculate pole tension, and by described pole tension supply power switch, realized two 60 degree release of sections or the stopcock forced respectively near the crest of phase voltage and trough, power switch loss is reduced to 1/3, compressor still can even running, thereby alleviated the wearing and tearing of 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 value, carry out the above-mentioned control method to power switch, and when outdoor environment temperature is not more than default temperature 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, use all the time 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 control device of convertible frequency air-conditioner power switch, as shown in Figure 5, comprising:
The course of work of installing described in the present embodiment is: judge module judges whether to meet default condition, if, voltage transformation module is three-phase voltage by the voltage transitions under two-phase rotating coordinate system, computing module is according to described three-phase voltage and default computation rule, calculate pole tension, control module is supplied with described power switch by pole tension, realizes the control to described power switch.
Device described in the present embodiment, comprise and calculate the computing module of pole tension and described pole tension is supplied with to described power switch, realized the control module that described power switch is controlled, two 60 degree release of sections or the stopcock forced respectively near the crest of phase voltage and trough have been realized, power switch loss is reduced to 1/3, compressor still can even running, thereby alleviated the wearing and tearing of 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 current time relatively, determines maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
Pole tension determining unit 603, for when described maximum voltage value and described minimum voltage value and while being more than or equal to zero, determine that described pole tension 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 is the poor of default value and described minimum voltage value.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment same or similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, 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 will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a control method for convertible frequency air-conditioner power switch, is characterized in that, comprising:
Judge whether to meet default condition;
When meeting default condition, by the voltage transitions under two-phase rotating coordinate system, be three-phase voltage;
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.
2. method according to claim 1, is characterized in that, the described three-phase voltage of described foundation and default computation rule calculate pole tension and comprise:
The size of three-phase voltage described in current time relatively, determines maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
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 that described pole tension 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 is the poor of default value and described minimum voltage value.
3. method according to claim 2, is characterized in that, described default value comprises:
Half of bus voltage value.
4. method according to claim 1, is characterized in that, described default condition comprises:
Outdoor environment temperature is greater than default temperature value.
5. method according to claim 1, is characterized in that, described default condition comprises:
Empty condition.
6. 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, for when meeting default condition, is three-phase voltage by the voltage transitions under two-phase rotating coordinate system;
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 the control to described power switch.
7. device according to claim 6, is characterized in that, described computing module comprises:
Comparing unit, for the size of three-phase voltage described in current time relatively, determines maximum voltage value, minimum voltage value and intermediate voltage value in three-phase voltage described in current time;
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 and while being more than or equal to zero, determine that described pole tension 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 is the poor of default value and described minimum voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210343873.3A CN103684001B (en) | 2012-09-17 | 2012-09-17 | The control method of power switch and device in convertible frequency air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210343873.3A CN103684001B (en) | 2012-09-17 | 2012-09-17 | The control method of power switch and device in convertible frequency air-conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103684001A true CN103684001A (en) | 2014-03-26 |
| CN103684001B CN103684001B (en) | 2016-05-11 |
Family
ID=50320562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210343873.3A Active CN103684001B (en) | 2012-09-17 | 2012-09-17 | The control method of power switch and device in convertible frequency air-conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103684001B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270422A (en) * | 2018-09-11 | 2019-01-25 | 全球能源互联网研究院有限公司 | A kind of evaluation method and device of IGBT device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267542A1 (en) * | 2005-05-27 | 2006-11-30 | Lixiang Wei | Pulse width modulation (PWM) rectifier with variable switching frequency |
| US20070268051A1 (en) * | 2006-05-17 | 2007-11-22 | Rockwell Automation Tecnhologies, Inc. | Modulation methods and apparatus for reducing common mode noise |
| 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 |
-
2012
- 2012-09-17 CN CN201210343873.3A patent/CN103684001B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267542A1 (en) * | 2005-05-27 | 2006-11-30 | Lixiang Wei | Pulse width modulation (PWM) rectifier with variable switching frequency |
| US20070268051A1 (en) * | 2006-05-17 | 2007-11-22 | Rockwell Automation Tecnhologies, Inc. | Modulation methods and apparatus for reducing common mode noise |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270422A (en) * | 2018-09-11 | 2019-01-25 | 全球能源互联网研究院有限公司 | A kind of evaluation method and device of IGBT device |
| CN109270422B (en) * | 2018-09-11 | 2023-08-11 | 全球能源互联网研究院有限公司 | Evaluation method and device of IGBT device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103684001B (en) | 2016-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104214886B (en) | The control method of convertible frequency air-conditioner | |
| CN106066435A (en) | Photovoltaic DC-to-AC converter aging testing system | |
| CN103323664B (en) | Electric power subitem energy consumption timesharing requirement method for early warning | |
| CN103684001A (en) | Method and device for controlling power switch in frequency-variable air conditioner | |
| CN205691700U (en) | Photovoltaic DC-to-AC converter aging testing system | |
| CN203720617U (en) | A communication base station machine room power saving and air exchange energy saving controlling apparatus | |
| CN103760842A (en) | Power saving and air exchange energy saving control device of communication base station room | |
| CN105703420B (en) | Control system and its control method and automobile | |
| CN208369467U (en) | totem PFC circuit and air conditioner | |
| CN104183997B (en) | A kind of control supply socket and control method of avoiding the peak hour based on virtual energy storage | |
| CN105134636A (en) | Environment-friendly fan and control method thereof | |
| CN109931747A (en) | A kind of control method with power saving function refrigerator | |
| CN106549426B (en) | Vehicular charging control method and device | |
| CN105089965B (en) | A kind of AC photovoltaic water pump system and its control method | |
| CN106100489B (en) | A kind of energy-saving control method | |
| CN202334410U (en) | Frequency conversion control system | |
| CN103825481A (en) | Hybrid modulation method for smooth handoff between SHEPWM and SVPWM of three-level converter | |
| CN112015093B (en) | Drive control method, device, household appliance and computer readable storage medium | |
| CN103470520B (en) | Large power power electronic appliance power cabinet volume adjusting apparatus | |
| CN207527785U (en) | A kind of battery saving arrangement of central air-conditioning freezing water circulating pump | |
| CN204615667U (en) | A kind of battery saving arrangement for power-equipment | |
| CN208674884U (en) | A kind of automatic switching energy-storage system | |
| CN204787073U (en) | Air conditioner continuously uses electricity -saving appliance | |
| CN112019027A (en) | Drive control method, device, household appliance and computer readable storage medium | |
| CN106286249A (en) | Method for controlling frequency conversion, controller and refrigerator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |