CN201104351Y - DC frequency converting air-conditioner compressor driving circuit - Google Patents
DC frequency converting air-conditioner compressor driving circuit Download PDFInfo
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- CN201104351Y CN201104351Y CNU2007201737631U CN200720173763U CN201104351Y CN 201104351 Y CN201104351 Y CN 201104351Y CN U2007201737631 U CNU2007201737631 U CN U2007201737631U CN 200720173763 U CN200720173763 U CN 200720173763U CN 201104351 Y CN201104351 Y CN 201104351Y
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Abstract
The utility model relates to the DC variable-frequency air conditioner field and discloses a driving circuit for a DC variable-frequency air condition compressor, comprising a power supply, an intelligent power module (IPM), a detection controller, a DC variable-frequency compressor and a current detection sensor, wherein the current detection sensor is composed of a non-inductive resistor; the power supply undergone the rectification of a rectifier and the filtration of a capacitor is converted into a DC power supply and the non-inductive resistor is connected serially in a DC power supply circuit; the intelligent power module (IPM) is connected with the DC power supply and the DC variable-frequency compressor; the detection controller is connected with the non-inductive resistor and the intelligent power module (IPM). The driving circuit for a DC variable-frequency air condition compressor solves the problem of loss of control of the compressor due to the inaccuracy of the current detection and realizes accurate control over the compressor.
Description
Technical field
The utility model relates to the DC frequency converting air-conditioner field, particularly relates to a kind of DC frequency converting air-conditioner compressor drive circuit.
Background technology
Along with the arrival of energy crisis in the world wide, each state is all promoting energy-saving and cost-reducing technology energetically for sustainable economic development. and as the capital equipment of household electricity, traditional air-conditioning is eliminated by market gradually because its operational efficiency is low.
The energy-saving effect of DC frequency-changing is much better than traditional fixed frequency air conditioner and AC frequency conversion air-conditioning.As everyone knows, the fixed frequency air conditioner power consumption is very big, and the frequency conversion narrow range of AC frequency conversion, compressor efficiency is low.DC frequency-changing is the operation conditions that fundamentally changes compressor, realizes air-conditioning stepless speed regulation, and power savings can improve about 40%.Direct current varied-frequency air conditioner more and more is subjected to liking of users because of characteristics such as good energy-conservation, accurate temperature controlling, ultralow temperature start, heat fast.2004, European convertible frequency air-conditioner occupation rate of market reached more than 50%, wherein 90% be DC frequency converting air-conditioner.Synchronous with international market air-conditioning replacement development trend, present domestic convertible frequency air-conditioner market enters convertible frequency air-conditioner comprehensively and regenerates the epoch, and DC frequency-changing becomes the overriding concern factor that current consumer selects air-conditioning rapidly.
In the DC frequency converting air-conditioner technical field, come branch to have two kinds by the compressor controlling schemes, a kind of is with the scheme of 120 degree controls, is the trapezoidal wave controlling schemes again, and this control mode is simple, parameter dependence to compressor is low, but this control mode is low to the utilization ratio of compressor, and frequency characteristic is poor, and low-frequency vibration is big, high-frequency noise is big, can not well bring into play the advantage of DC frequency-changeable compressor; Another kind of control mode is 180 degree controlling schemes, is sine DC frequency conversion controlling schemes or vector DC frequency-changing controlling schemes again.This controlling schemes does not need not conducting phase when the detection rotor position, the frequency conversion drive pattern is spent sinusoidal wave DC frequency-changing pattern with 180, has improved the service efficiency of compressor greatly, and the frequency characteristic of this control mode also is much better than 120 degree control modes.But 180 degree DC frequency-changing control technology difficulty are big, need set up complicated mathematical model, need to use high-speed chip just can finish related operation, and 180 degree control modes are strong to the parameter dependence of compressor.
There is multiple algorithm can realize not having transducer control at present, traditional method, promptly the zero passage detection method mostly adopts the zero crossing that detects not conducting opposite potential to judge the position of rotor, selects best change of current order according to zero crossing information and phase change logic.Present DC frequency converting air-conditioner mostly adopts this method to detect the position of compressor drum.But because the zero passage detection method can only detect some specific points, and along with the wide variation of motor speed, the frequency conversion rate of back-emf also can change, and the filtering device in the testing circuit can bring certain phase shift, this greatly influence detect the accuracy of zero crossing; Simultaneously because the reverse current effect of fly-wheel diode on the power device, under big current conditions, also can bring certain influence to the detection of zero crossing, and this detection mode needs the not conducting of detected phase, can only be used for 120 degree variable mode, and can't be used for the sinusoidal wave variable mode of 180 degree, this just greatly reduces the utilization ratio of compressor.
At these problems, subsequent development adopts single resistor current prediction algorithm and three resistor current prediction algorithms to estimate the instantaneous position and the velocity information of brushless DC motor rotor, for having transducer control, brushless DC motor do not provide a kind of solution preferably, and do not need not conducting phase during this current forecasting algorithm detection rotor position, the frequency conversion drive pattern is spent sinusoidal wave DC frequency-changing pattern with 180, improve the service efficiency of compressor greatly, improved the high frequency characteristics and the low frequency characteristic of system greatly.
With single resistor current prediction algorithm is example, control section detects bus current (Idc) by detecting resistance, then bus current is analyzed, extrapolate compressor three-phase current (Iu, Iv, Iw), pass through Mathematical Modeling then, utilize the parameter of vector control theory and compressor to extrapolate the angular error and the angular speed of rotor, and then calculate the angle of rotor.For variable frequency control provides the rotor-position foundation, thus control compressor operation that can be reliable and stable.
But, in the process of experiment, find, by detecting the electric current substitution Mathematical Modeling that resistance detection is come out, calculate the angle of rotor, when controlling compressor then, the time and have situation out of control and take place.Especially when electric current changed greatly, it is more frequent that situation out of control occurs.
The utility model content
The purpose of this utility model provides and solves compressor problem out of control, and a kind of DC frequency converting air-conditioner compressor drive circuit particularly is provided.
For reaching above-mentioned purpose, the technical solution of the utility model provides a kind of DC frequency converting air-conditioner compressor drive circuit, comprise power supply, Intelligent Power Module IPM, detect controller, DC frequency-changeable compressor and current detection sensor, described current detection sensor is made of noninductive resistor; Become DC power supply behind the rectification of described power supply process rectifier bridge, the capacitor filtering, described noninductive resistor is connected in the dc power supply circuit; Described Intelligent Power Module IPM is connected with DC frequency-changeable compressor with described DC power supply; Described detection controller is connected with Intelligent Power Module IPM with described noninductive resistor.
Wherein, described noninductive resistor for adopt two-wire and around the resistor made of resistance wire.
Wherein, the nominal power of described noninductive resistor should be two times of actual dissipation power at least.
Technique scheme has following advantage: the utility model is by adopting noninductive resistance, utilize the little characteristics of noninductive resistance induction reactance to improve the precision of resistance, thereby solved the compressor shortcoming out of control that causes because of current detecting is inaccurate, therefore can better control compressor operating.
Description of drawings
Fig. 1 is the structural circuit figure of a kind of DC frequency converting air-conditioner compressor drive circuit of the utility model embodiment;
Fig. 2 is the equivalent schematic of a kind of resistance of the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.
Fig. 1 is the structural circuit figure of a kind of DC frequency converting air-conditioner compressor drive circuit of the utility model embodiment.As seen from Figure 1, AC power provides DC power supply after by rectifier bridge rectification, capacitor filtering, and wherein R1 is a noninductive resistor, has constituted current detection sensor.Noninductive resistor R1, Intelligent Power Module IPM, DC frequency-changeable compressor are connected in the dc power supply circuit successively.Detect controller and be connected with Intelligent Power Module IPM with noninductive resistor R1, detect controller and comprise high-speed microprocessor, high-speed microprocessor is controlled Intelligent Power Module IPM and DC frequency-changeable compressor according to the electric current of gathering by noninductive resistor R1.R1 is connected with current protective device, and current protective device detects the voltage on the R1, is converted into monitoring current then; compare with safe current,, then carry out safeguard protection if monitoring current is higher than safe current; if monitoring current is lower than safe current, then keep operate as normal.
Fig. 2 is the equivalent schematic of a kind of resistance of the utility model embodiment.As shown in Figure 2, the detection resistance before the arrow under the expression perfect condition is its actual equivalent electric circuit behind the arrow.Detection resistance under the perfect condition is equivalent to the resistance series connection sense electric capacity of going up in parallel again that powers in practice, when the electric current that flows through resistance changes, LC can shake, the electric current that concussion is produced can be added on the actual electric current, make the numerical value and the actual deviation that takes place that detect, especially current break the time, deviation at this moment can be very big.In 120 degree control modes in the past, owing to be to control compressor, do not need to detect very accurately bus current by detecting zero crossing, so, less demanding for resistance.And in 180 degree control modes, need come the substitution Mathematical Modeling by detecting bus current, and then calculate the angle of rotor, control compressor.So, very high for the required precision that detects numerical value, so, just need to reduce the influence that electric current brought that the LC concussion is produced.So, just can improve the precision of resistance, improve the precision that detects numerical value with this by reducing induction reactance.Present embodiment adopts noninductive resistor as detecting resistance, as current detection sensor in the sinusoidal wave variable mode drive circuit of 180 degree.The sensibility reciprocal of noninductive resistor stray inductance is very little, and precision is higher.Use noninductive resistance to carry out current detecting, will avoid the existence because of inductance value to a great extent, the detection distortion that is caused is to such an extent as to the situation of calculated data mistake takes place.
Noninductive resistor adopt two-wire and around resistance wire make, for the consideration of safety and heat radiation, nominal power should be two times of actual dissipation power at least.The resistance of noninductive resistor is the milliohm rank, and the maximum current that allows according to compressor parameter and IPM module different and different generally are between 10～40 milliohms.Power is by calculating.That we use now is 5W basically.Concrete computing formula is, what power W equaled that IPM allows maximum current square multiply by the noninductive resistor resistance.
By above embodiment as can be seen, the utility model embodiment is by just using noninductive resistance as detecting resistance in the DC frequency converting air-conditioner compressor drive circuit, can guarantee that detected electric current is more accurate, thereby solved and caused because of current detecting is inaccurate and the problem that compressor control is out of control to have realized accurate control compressor.
The above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1, a kind of DC frequency converting air-conditioner compressor drive circuit comprises power supply, Intelligent Power Module IPM, detects controller, DC frequency-changeable compressor and current detection sensor, it is characterized in that described current detection sensor is made of noninductive resistor;
Become DC power supply behind the rectification of described power supply process rectifier bridge, the capacitor filtering, described noninductive resistor is connected in the dc power supply circuit;
Described Intelligent Power Module IPM is connected with DC frequency-changeable compressor with described DC power supply;
Described detection controller is connected with Intelligent Power Module IPM with described noninductive resistor.
2, DC frequency converting air-conditioner compressor drive circuit as claimed in claim 1 is characterized in that, described noninductive resistor for adopt two-wire and around the resistor made of resistance wire.
3, DC frequency converting air-conditioner compressor drive circuit as claimed in claim 2 is characterized in that, the nominal power of described noninductive resistor should be two times of actual dissipation power at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201737631U CN201104351Y (en) | 2007-10-23 | 2007-10-23 | DC frequency converting air-conditioner compressor driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201737631U CN201104351Y (en) | 2007-10-23 | 2007-10-23 | DC frequency converting air-conditioner compressor driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201104351Y true CN201104351Y (en) | 2008-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201737631U Expired - Lifetime CN201104351Y (en) | 2007-10-23 | 2007-10-23 | DC frequency converting air-conditioner compressor driving circuit |
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| Country | Link |
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| CN (1) | CN201104351Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834559A (en) * | 2010-05-25 | 2010-09-15 | 中山职业技术学院 | Phase-shifting output system of frequency converter of home appliance compressor and implementing method thereof |
| CN102969957A (en) * | 2012-11-19 | 2013-03-13 | 海尔集团公司 | Starting control method and control device of direct-current variable frequency air-conditioning compressor |
| CN106602956A (en) * | 2017-01-24 | 2017-04-26 | 沈阳工业大学 | Variable frequency air condition compressor permanent magnet direct current motor control system and method |
| CN107370390A (en) * | 2016-05-11 | 2017-11-21 | 博世力士乐(西安)电子传动与控制有限公司 | Converter plant and conversion method |
-
2007
- 2007-10-23 CN CNU2007201737631U patent/CN201104351Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834559A (en) * | 2010-05-25 | 2010-09-15 | 中山职业技术学院 | Phase-shifting output system of frequency converter of home appliance compressor and implementing method thereof |
| CN101834559B (en) * | 2010-05-25 | 2012-02-29 | 中山职业技术学院 | Phase-shifting output system of frequency converter of home appliance compressor and implementing method thereof |
| CN102969957A (en) * | 2012-11-19 | 2013-03-13 | 海尔集团公司 | Starting control method and control device of direct-current variable frequency air-conditioning compressor |
| CN102969957B (en) * | 2012-11-19 | 2015-09-02 | 海尔集团公司 | A kind of startup control method of DC frequency converting air-conditioner compressor |
| CN107370390A (en) * | 2016-05-11 | 2017-11-21 | 博世力士乐(西安)电子传动与控制有限公司 | Converter plant and conversion method |
| CN106602956A (en) * | 2017-01-24 | 2017-04-26 | 沈阳工业大学 | Variable frequency air condition compressor permanent magnet direct current motor control system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Qingdao Dingxin Electronics Technology Company Ltd. Assignor: haier group corporation|Haier Air Conditioner Co. Ltd., Qingdao Contract fulfillment period: 2008.10.25 to 2017.10.22 Contract record no.: 2009370000043 Denomination of utility model: DC frequency converting air-conditioner compressor driving circuit Granted publication date: 20080820 License type: Exclusive license Record date: 20090407 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.25 TO 2017.10.22; CHANGE OF CONTRACT Name of requester: QINGDAO HAIER INTELLIGENT ELECTRONICS CO., LTD. Effective date: 20090407 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080820 |