CN201416980Y - Direct-current frequency-varying air-conditioning compressor intelligent controller and air-conditioner controlled by same - Google Patents

Abstract

The utility model provides a technical scheme of a direct-current frequency-varying air-conditioning compressor intelligent controller and a controlling method thereof. The hardware scheme includes arectified filter circuit and a power module which are sequentially and electrically connected, the rectified filter circuit (220) is electrically connected with a single DPS controller which is used as a core processing unit through a switch power source (240) additionally, and the single DPS controller is respectively electrically connected with the power module, a communication separating circuit used for communicating with an air-conditioner indoor machine, a blower-driven circuit (280) and a temperature sampling circuit (270). A controlling software is implanted into the DSP controller, adouble closed ring FOC no-sensor magnetic field vector controlling mode is employed, a current ring of an inner ring realizes decoupling control of driving current of a permanent magnetic synchronousmotor of a compressor and indirectly controls output torque of the motor, and a speed ring of an outer ring is used for controlling working frequency of the compressor, thereby enabling the working frequency to meet stable state requirement when in fixed frequency and dynamic response when in changing frequency. Besides, the controlling software consists of a primitive recursive function and a primitive interrupt function.

Description

A kind of DC frequency converting air-conditioner compressor intelligent controller and the air conditioner of being controlled thereof

Technical field

The utility model belongs to electronic intelligence control technology field, relates to a kind of DC frequency converting air-conditioner compressor intelligent controller and control method thereof, also relates to the air conditioner that it is controlled simultaneously.

Background technology

Tradition fixed frequency air conditioner machine (fixed frequency air conditioner machine) employing " open--close " the secured adjusted pattern, energy consumption is big, and noise and temperature fluctuation are big, and comfortableness is poor, during switch compressor of air conditioner is also had bigger infringement.Compare with it, transducer air conditioning is the frequency converter change frequency by microcomputerized control by interior dress, thus the rotating speed of control cooler compressor.Compressor rotary speed can be changed continuously, realize the step-less adjustment of compressor energy.

What is fixed frequency air conditioner and convertible frequency air-conditioner: difference frequently fixed and frequency conversion just is the control mode of the rotating speed of compressor.The rotating speed of fixed frequency air conditioner compressor is fixed, and is immutable; Cold (heat) of output amount also is fixing, unadjustable during its refrigeration (heat); So the adjusting of temperature can only opening or stopping and regulate by compressor.The rotating speed of convertible frequency air-conditioner---compressor is not fixing, can change; Cold (heat) of output amount also can be regulated during its refrigeration (heat); So the adjusting of temperature can be exported cold thereby change air-conditioning by changing the rotating speed of compressor.

The difference of fixed machine frequently, AC frequency conversion, DC frequency-changing and full DC frequency-changing: from the power saving aspect, be reference with fixed machine frequently, in general the AC frequency conversion power saving 30%, and the DC frequency-changing power saving is more than 40%.Analyze from comfortableness, the noise of DC frequency-changing is lower, temperature fluctuation is lower, and comfortableness is higher.The three presses the ordering of its energy saving, comfortableness and price: DC frequency-changing＞AC frequency conversion＞constant speed machine.

The main distinction that the rotating speed air-conditioner decided in convertible frequency air-conditioner and common air-conditioning device or title is that the former has increased frequency converter.The micro computer of convertible frequency air-conditioner collect at any time indoor environment for information about with the setting value of inside relatively, through calculation process output control signal.The operation principle of AC frequency conversion air-conditioning is that industrial-frequency alternating current is converted to dc source, and it is delivered to power model (high power transistor switch combination); The control signal that the while module is sent here by micro computer is controlled, the alternating source that output frequency is adjustable (synthetic waveform near sinusoidal ripple), make the rotating speed of compressor electric motor do corresponding the variation, thereby the discharge capacity of control compressor is regulated refrigerating capacity or heating capacity with the variation of supply frequency.DC frequency converting air-conditioner is converted to dc source to industrial-frequency alternating current equally, and delivers to power model, and the control signal that module is sent here by micro computer is equally controlled; Different is that the sine-wave current that the AC frequency conversion Climate Control Module is exported is synthesized by hardware, and the sine-wave current of module output is produced by software algorithm in the DC frequency converting air-conditioner, and speed adjusting performance is identical with direct current generator, so more power saving of DC frequency converting air-conditioner, and noise is littler.

The DC frequency-changing technology is real power-saving technology, also is the state-of-the-art power-saving technology of generally acknowledging in the world at present, and it is more energy-conservation more than 40% than common air-conditioning.Compare with the conventional DC converter technique, sinusoidal wave DC frequency-changing technology has plurality of advantages such as efficient is higher, operation is more steady, noise is lower.

120 degree square waves and the sinusoidal wave difference of 180 degree: 120 degree square wave controls occur several years earlier, and 180 degree sine waves are the products after its upgrading.The sinusoidal wave control mode of present 180 degree is also ripe, and it is controlled at aspects such as energy-conservation, refrigerating efficiency, stability, control accuracy than 120 degree square waves all have better performance, representing the highest level of converter technique at present.

Convertible frequency air-conditioner in the market mainly adopts direct current 120 degree frequency conversions (square wave driving) and two kinds of schemes of direct current 180 degree frequency conversions (just profound ripple drives).The former cost is low, control algolithm is simple, but energy-saving effect and noise control are unsatisfactory, and is superseded substantially abroad.Compare with the former, direct current 180 degree convertible frequency air-conditioners have superior energy-saving effect, and it is more steady quiet to turn round, and cooperate novel refrigerant can accomplish that zero pollutes, and meet very much the developing direction of current energy-saving and emission-reduction.But the controller core technology of present 180 degree DC frequency converting air-conditioners is all grasped in the multinational hand of several families, these trans-corporations always block its core technology, though domestic air-conditioning producer is producing 180 degree DC frequency converting air-conditioners, it remains blank at the controller core technical elements.So domestic air-conditioning producer all is the controller that these trans-corporations of high price whole set procurement produce basically, cause the production cost of 180 degree DC frequency converting air-conditioners can not to be in any more.

In recent years, domestic Haier of main air-conditioning producer of several families, beautiful, Gree etc. are also developed 180 degree DC variable frequency air conditioner controllers, but break through frequency conversion inversion control key core technology owing to fail, frequency conversion inversion control module must dependence on import, its forecast scheme configuration needs two microcontrollers that can enroll software at least, the i.e. module that is used for the frequency conversion inversion control of enrolling other people software of a dependence on import and another module that is used for other Based Intelligent Control that can enroll independent research software.(applying date: 2006-11-29, open day: open source literature CN101192807A 2008-06-04), described be exactly typical such scheme to China's utility application 200610144999.2.Such scheme also exists frequency conversion inversion control key core technology need rely on other people naturally, and cost still is in not inferior defective.

The applicant has retrieved the relevant prior art document of a large amount of the application, thinks that Chinese patent literature CN1083170C, CN1266428C, CN101192807A, CN101191651A, CN201072207Y are the utility model related art document; And think that wherein open source literature CN101192807A is the immediate prior art document of the utility model.

Summary of the invention

The technical problem that the utility model at first will solve is the technical scheme that a kind of DC frequency converting air-conditioner compressor intelligent controller and control method thereof are provided at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above by the following technical solutions:

The basic scheme of the utility model controller hardware configuration: a kind of DC frequency converting air-conditioner compressor intelligent controller, comprise and carry out current rectifying and wave filtering circuit (220) that is electrically connected and the power model (210) that is used to drive DC frequency-changeable compressor (140) successively, described current rectifying and wave filtering circuit (220) has the electrical interface that is used to connect electric main (150), and described power model (210) has the electrical interface that is used to connect DC frequency-changeable compressor (140); It is characterized in that, described current rectifying and wave filtering circuit (220) the in addition Switching Power Supply (240) through being used to provide low-tension supply is electrically connected with single dsp controller (200) as core processing unit, described single dsp controller (200) also respectively with described power model (210), be used for communication buffer circuit (250) with indoor apparatus of air conditioner (100) communication, be used to drive the blower fan drive circuit (280) of fan of outdoor unit of air conditioner, be used for temperature signal is converted into and can be electrically connected by the temperature sampling circuit (270) of the signal of telecommunication of described dsp controller (200) reception, described temperature sampling circuit (270) has the electrical interface that is used to connect temperature sensor (120).

Switch for air conditioner refrigeration, the mode of heating that realization is controlled, described dsp controller (200) also connects the relay (260) that is used to control air-conditioner outdoor unit cross valve (110).

For improving power factor, described current rectifying and wave filtering circuit (220) through circuit of power factor correction (230), is electrically connected with described power model (210) and Switching Power Supply (240) respectively earlier again.

Switch for air conditioner refrigeration, the mode of heating that realization is controlled, improve power factor simultaneously, described current rectifying and wave filtering circuit (220) through circuit of power factor correction (230), is electrically connected with described power model (210) and Switching Power Supply (240) respectively earlier again; Described dsp controller (200) also connects the relay (260) that is used to control air-conditioner outdoor unit cross valve (110).

Further scheme as such scheme, described power model (210) comprises one group of single resistor current sample circuit, described single resistor current sample circuit is by the direct current signal on the resistance R that is captured in bus negative terminal serial connection, by the motor phase current reconstruction technology, restore 3 phase current information of motor.

As preferably, described sampling resistor is the overcurrent protection resistance of IPM power model (210).This preferred version sampling resistor has utilized the overcurrent protection resistance of IPM power model just, so can not increase any hardware cost.

As above-mentioned further scheme scheme arranged side by side, described power model (210) comprises one group of three resistor current sample circuit, described three resistor current sample circuits are serially connected in three resistance R 1 on the brachium pontis negative terminal, the direct current signal on R2, the R3 under described power model (210) three-phase respectively by gathering, and directly obtain the three-phase current information of motor.

As preferably, described three sampling resistor R1, R2, R3 are the overcurrent protection resistance of IPM power model (210).

As further concrete scheme, the main power circuit of described circuit of power factor correction (230) comprises the following components and parts that begin to be electrically connected successively from input side: diode full-wave rectifying circuit, energy storage inductor L, power tube S, booster diode D, output capacitance C, and related load; Continuous mode PFC algorithm structure is divided into outer voltage, given algorithm and current inner loop three parts; Outer voltage realization output dc voltage is followed given voltage; The electric current given algorithm produces the sinusoidal waveform consistent with input voltage, and adds permanent power voltage feedforward; Current inner loop realizes input AC current following input ac voltage waveform, finishes the PFC function.

The basic scheme of the utility model controller intelligence control method: a kind of intelligence control method of DC frequency converting air-conditioner compressor, control enforcement with DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 1 or 2, in described dsp controller (200), implant control software, employing abbreviates the no sensor magnetic field vector control mode of FOC as, described FOC adopts two closed-loop controls, interior ring is electric current loop, and outer shroud is a speed ring; Electric current loop is realized the decoupling zero control to the compressor permanent magnet synchronous electric motor drive current, controls the output torque of motor indirectly; Speed ring is used for controlling the operating frequency of compressor, the dynamic response when making it can satisfy stable state when deciding frequency and require to satisfy frequency conversion again.

As the further preferred version of the basic scheme of above-mentioned control method, described in the control flow of circular current ring be:

A1, at first the compressor phase current is sampled, carry out the coordinate transform of electric current decoupling zero then.By the Clake conversion three-phase current is transformed to the static orthogonal coordinate system of two-phase, it is transformed to the two-phase rotating coordinate system by the Park conversion.In the two-phase rotating coordinate system, hand over shaft current just can reach the effect of control motor output torque by control.

A2, the biphase current of the rotating coordinate system after the conversion is carried out electric current loop PID closed-loop control.Wherein d-axis (D axle) component is the exciting current of motor, makes it be always zero; And hand over axle (Q axle) component is the torque current of motor, makes it follow the set-point of speed ring output automatically.

A3, the output quantity of electric current loop is carried out anti-Park conversion, and be translated into the dutycycle of PWM ripple by space vector algorithm (SVPWM).

The dutycycle of a4, the PWM ripple that calculates according to the space vector algorithm by 3 groups of PWM output ports of DSP, is exported the PWM waveform of 6 tunnel complementations, is used for controlling the power inverting bridge and directly drives the DC frequency-changing press.

The control flow of described outer shroud speed ring is:

The dutycycle and the actual press current sampling data of b1, the three-phase PWM ripple that calculates according to the space vector algorithm are by the physical location of sliding mode observer estimation press rotor.Its angle value that estimates will be in order to the coordinate transform of next interrupt cycle and the calculating of motor speed.

B2, calculate the actual motion frequency of press according to the estimated value of motor rotor position, and the PID closed-loop adjustment by speed ring, make the actual motion frequency of press effectively follow target frequency, reach the automatic control of press frequency.

Further preferred version as the basic scheme of above-mentioned control method, this control software comprises a primitive recursive function and a main interrupt function, the main interrupt function of preferential execution, the described cycle in the primitive recursive function time interval is set at the moment T in ms, is used to carry out compressor rotary speed detection, speed ring PID adjusting, compressor position feedback compensation, controls with indoor set communication, running state of air conditioner; The described main cycle in the interrupt function time interval is set at the moment t in 0.1ms much smaller than T, is used to carry out compressor phase current, DC bus-bar voltage, AC-input voltage AD sampling, coordinate transform, electric current loop PID adjusting, anti-Park conversion, space vector and calculates vector converter control, the motor rotor position estimation that SVPWM is a compressor.

As the further preferred version of the basic scheme of above-mentioned control method, the control step that described primitive recursive function is used for carrying out comprises:

Behind c1, the electrification reset, at first system is carried out initialization, comprising: to the initialization of each hardware module register, the initialization of software variable initial value and the setting and the unlatching of each system break, program just entered primitive recursive function after system initialization was finished;

Whether c2, determining program operation reach the time interval T1 of setting, include but not limited to following control flow if reach T1 then carry out: the press rotating speed detects, speed ring PID regulates, the press position feedback compensation; Wherein, the press rotating speed detects the rotating speed that subfunction mainly is responsible for calculating in real time according to the external feedback information of compressor press; Speed ring PID regulates the difference that subfunction then compares compressor actual frequency and target frequency, and carry out the PID closed-loop control, make compressor actual frequency automatically track target frequency, reach the purpose of effective control press frequency, the output quantity of speed ring will be as the specified rate of electric current loop;

Whether the operation of c3, determining program reaches the setting-up time interval T 2 greater than T1 of setting, if reach T2 then carry out flow process with the indoor set communication; Mainly comprise the exchange of exchange, system error message and the guarded command of air-conditioning system indoor set and off-premises station operational factor with the communication of indoor set;

C5, system then carry out running state of air conditioner control flow and system protection flow process etc. at one's leisure; Wherein, to the real-time control of compression frequency, guarantee that air-conditioning is always operating under the state of Energy Efficiency Ratio the best under the different condition such as the running state of air conditioner control flow mainly carries out air conditioner refrigerating, heat; The system protection flow process then mainly is responsible for each hardware cell of protection air-conditioner outdoor unit and all is operated in the safe range, includes but not limited to voltage, the current protection of controller, all temps protection and the frequency limitation of compressor.

Described interruption interrupt function is used for carrying out following steps:

D1, after program operation reaches the time interval t of setting, then enter this interrupt function; At first the phase current of compressor, the DC bus-bar voltage analog quantity of controller are carried out digitized sampling, these analog quantitys are as the external feedback and the control basis of system's control;

D2, compressor phase current sampling value is carried out coordinate transform; By the Clake conversion three-phase current is transformed to the static orthogonal coordinate system of two-phase, it is transformed to the two-phase rotating coordinate system by the Park conversion;

D3, the biphase current of the rotating coordinate system after the conversion is carried out electric current loop PID closed-loop control; Make the direct-axis component of compressor current always remain zero, and quadrature axis component is followed the set-point of speed ring output automatically;

D4, the output quantity of electric current loop is carried out anti-Park conversion, it is transformed into the two-phase rest frame; Output quantity after the conversion will be used to calculate the dutycycle of SVPWM;

D5, according to top output quantity, by spatial vector pulse width modulation algorithm (SVPWM), it is scaled the dutycycle of three-phase PWM ripple; By 3 groups of PWM output ports of DSP, the control power model directly drives the DC frequency-changing press;

D6, according to the dutycycle and the actual press current sampling data of the three-phase PWM ripple of previous step output, by the physical location of sliding mode observer estimation press rotor; Its angle value that estimates will be in order to the coordinate transform of next interrupt cycle;

Further preferred version as the basic scheme of above-mentioned control method, with controlling enforcement as claim 3 or 4 described DC frequency converting air-conditioner compressor intelligent controllers, described primitive recursive function is also carried out the control of PFC (PFC) Voltage loop, accordingly, between step c3 and c5, insert step:

Whether c4, determining program operation reach the time interval T3 greater than T2 of setting, if reach T3, then carry out PFC Voltage loop control flow; PFC (PFC) Voltage loop control is main in order to realize the effective control to system busbar voltage, makes the busbar voltage can be steady in a long-term in claimed range, realizes boosting and the function of voltage stabilizing;

Described main interrupt function is combine digital PFC current loop control also, in step a, also carry out analog quantitys such as the electric current of PFC inductance and AC-input voltage and carry out digitized sampling, after steps d 6 also in steps:

D7, according to the electric current and the AC-input voltage of the PFC inductance that obtains of sampling in the first step, and the output quantity of PFC voltage close loop control in the t5 cycle period is carried out the PID closed-loop control of digital pfc electric current loop.

As preferably, described step c2 also comprises and carries out press position feedback compensation subfunction, is used for eliminating the issuable hysteresis error of compressor position estimation.

As preferably, described space vector algorithm (SVPWM) is that the magnetic field that stator current produces is divided into 6 limit and 6 basic vectors, 2 zero vectors mutually, and the stator field of any direction all is to be synthesized by two adjacent basic vectors to obtain; The all corresponding a kind of state of opening of each basic vector can arbitrarily switch 6 basic vectors by the conducting state that changes 6 switching tubes; The space vector of any direction is divided into 6 limits mutually, and each vector of limitting mutually all is to be made of two adjacent basic vectors and two zero vectors, recently changes the size and Orientation of resultant vector by the duty that changes two basic vectors.

Described motor rotor position estimation method utilizes a kind of sliding mode observer Mathematical Modeling that is called as to estimate, set up state equation according to the model of motor under two-phase rest frame (alpha-beta coordinate system), come correction model by the deviation of constantly obtaining between electric current estimated value and the measured value, deviation is between the two faded away, to realize estimation to angle of rotor and speed; To estimate the poor of electric current and stator measured current, bring saturation function into, carry out phase shift compensation with the adaptive digital low pass filter then, can obtain the sin cos functions of rotor position angle by the output result.

The described utilization a kind ofly is called as the motor rotor position estimation method that the sliding mode observer Mathematical Modeling estimates and comprises following computing flow process:

E1, set up state equation according to the model of plug-in permanent magnet synchronous motor under two-phase rest frame (alpha-beta coordinate system): $\frac{d\stackrel{\·}{i_S}}{\mathrm{dt}}=(-\frac{R_S}{L_d}+\frac{j{\mathrm{\ω}}_r(L_d-L_q)}{L_d})\stackrel{\·}{i_S}+\frac{1}{L_d}(\stackrel{\·}{u_S}-\stackrel{\·}{e_S}),$ Calculate the estimation electric current

E2, relatively estimate electric current

With actual current i _SDifference, the calculating by one group of saturation function then obtains comprising the variable z of counter electromotive force information _S

E3, because signal z _SIn except comprising counter electromotive force information, also comprise many high fdrequency components and noise, so after it is carried out LPF, just obtained useful counter electromotive force information

E4, because counter electromotive force

In comprise the sin cos functions of position angle, so the magnetic linkage angle estimation by arctan function, the angle information that just obtains

E5, owing to adopt low pass filter to obtain counter electromotive force, introduced phase delay.Therefore, need make a phase delay table, command adapted thereto speed omega when obtaining operation according to the phase response of low pass filter _rAngle of phase displacement Δ θ, right

Compensate, obtain the angle of rotor estimated value at last

That is: ${\widetilde{\mathrm{\θ}}}_e=\widetilde{{\mathrm{\θ}}_{\mathrm{eu}}}+\mathrm{\Δ\θ}.$

Described PFC (PFC) is for adopting digital control single phase boost PFC (PFC) technology, be used for DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 7, this digital pfc technology is to adopt inductive current continuous mode (ContinuouS.Onductionmode, Active Power Factor Correction Technology CCM); The PFC of CCM is controlled to be the multiplier principle, and switching frequency is fixed, and the switching tube conduction ratio changes along with inductive current, and it is sinusoidal given finally to make average inductor current follow the tracks of, and realizes PFC.

The workflow of described PFC (PFC) comprises:

F1, sampling busbar voltage U _o, and with set-point U _rCompare, then its error is carried out PID and regulate; After finishing Voltage loop control, the U of output _mAs calculating the given of electric current loop;

F2, carry out the AD sampling, obtain the AC-input voltage u after the rectification exchanging the side input voltage _l, with the output U of itself and Voltage loop _mMultiply each other and obtain the given i of electric current loop _MoGiven i through the electric current loop behind the multiplier _MoIt is the waveform that is directly proportional with AC-input voltage basically; Through the current loop control of back, guarantee the tracking of input current, the PFC of realization again to input voltage;

F3, sampling resistor R by input is connected _sSample, obtain input current signal I _sBy to I _sAnd i _MoError carry out PID control, obtain the dutycycle of switching tube S, by PWM output pin and the IGBT drive circuit gauge tap pipe S of DSP, guarantee actual current I then _sThe tracing preset current i _Mo, realize current closed-loop control;

F4, the above voltage close loop control of process and current closed-loop control realize APFC, and make busbar voltage be stabilized on system's required voltage value, the ripple current of the bus filter capacitor that reduces.

A kind of compressor electric motor method for reconstructing phase current of DC frequency converting air-conditioner compressor intelligent controller, utilize described resistance R sampling inverter dc bus current, according to inverter on off state of living in and three-phase current relation, calculate each phase current, realize the phase current reconstruction of ac motor.

A kind of DC frequency converting air-conditioner machine, it disposes the above-mentioned compressor intelligent controller.

A kind of DC frequency converting air-conditioner machine is characterized in that it disposes the above-mentioned compressor intelligent controller, and uses the above-mentioned intelligence control method that is used to control DC frequency converting air-conditioner compressor.

The utility model has been realized the no sensor vector converter technique and ownization of core algorithm thereof of direct current 180 degree convertible frequency air-conditioners fully, and on this basis, has added some unique innovative designs and peculiar technology.Filled up domestic technological gap in 180 degree DC frequency converting air-conditioner control fields.The utility model 180 degree DC frequency converting air-conditioner electric controllers adopt the no sensor space vector converter technique of main flow in the world today, cooperate unique single resistance bus current Sampling techniques, have realized that frequency-changeable compressor low-cost, high energy efficiency drives.And integrated digital APFC (PFC), made the power factor of complete machine can reach more than 99.5%, satisfied of the requirement of present European market fully household electrical appliances power factor and harmonic wave.Next technical characterstic and the main innovation of controlling scheme at us carried out concise and to the point elaboration.

Core technology of the present utility model:

1, space vector converter technique (SVPWM).Compare with just profound pulsewidth modulation (SPWM) technology that present most 180 degree DC frequency converting air-conditioners adopt, space vector pulse width modulation technology (SVPWM) can make the utilization rate of busbar voltage improve 13.4%.Thereby busbar voltage is maximized the use, and the driving efficient (as maximum speed, max. output torque etc.) of compressor is improved significantly.But compare the software algorithm relative complex of SVPWM with SPWM.Present this technology is ownization all, and carried out unique improvement at the whole control scheme of 180 degree DC frequency converting air-conditioners.Specifically improve in technological innovation and further introduce.

2, magnetic field vector control (FOC) actuation techniques.By the three-phase fixed coordinate system is converted into the two-phase rotating coordinate system, realize decoupling zero control to the three-phase permanent synchronous compressor.Make that the rotating speed of compressor is more steady, electric current is more level and smooth, reduces compressor commutation pulsation, makes its running steadily quiet more, has effectively reduced the running noise of air-conditioning.

No sensor positional feedback technology.Adopt the sliding formwork observation method, estimate the physical location of rotor according to the phase current of busbar voltage and motor stator.This technology has effectively realized the real time position feedback of three-phase permanent magnet synchronous motor rotor, and strong to the adaptability of the parameter of motor, only needs simple several the parameters of adjusting, and just can realize the efficient control to various compressors.And this technology need not to increase extra counter electromotive force sample circuit, the complete machine cost of the controller that effectively reduces.

3, two closed loop automatic control technologies.Adopt two Closed loop Control of current inner loop and speed outer shroud that compressor is carried out efficiently control automatically accurately.Make that the speed of compressor and electric current can independent regulation, promptly compressor can be adjusted the output torque automatically with load variations under the certain situation of frequency.Effectively raise adaptive capacity and the speed responsive ability of compressor to load variations, make that compressor operation is more steady, frequency response is rapider, just make that also the cooling and warming of air-conditioning is rapider, temperature control is more accurate.

4, digital APFC (PFC) technology.This system combination digital APFC, the power factor of complete machine is reached more than 99.5%.We adopt continuous current control model (CCM), by two closed-loop controls of electric current loop and Voltage loop, make busbar voltage can be stabilized in about 400V, and input voltage can adapt to 160VAC～275VAC.Satisfy countries in the world fully to the power factor of household electrical appliances and the requirement of harmonic wave.This scheme has been cancelled the required special integrated circuit of conventional hardware PFC, has effectively saved the hardware cost of complete machine.

Breakthrough and innovation of the present utility model:

One, single resistance bus current Sampling techniques.This technology is sampled to bus current in the form of bus negative terminal with sampling resistor.Cooperate our exclusive bus current reducing process, sample, parse the threephase stator electric current of motor after that by bus current to the special occasion.This algorithm is our exclusive innovative technology, compare with present other like product (adopting the phase current sampling scheme), this single resistance bus current Sampling techniques can effectively be saved the circuit hardware cost, simplify the design of PCB fabric swatch, and the adaptability to the IPM power model is strong, make product wider, more help the update and the cost squeeze of product the choose of electronic parts face.

Two, SVPWM pulsewidth compensation technique.Cooperate single resistance bus current Sampling techniques,, must the impulse modulation width of inverter bridge be compensated in order to make its when minimum and very big (as power output) sampling under limiting case more accurate.My company innovates improvement to existing SVPWM algorithm, makes it can collect effective current in the bus more accurately under limiting case.

Three, no sensor compressor start technology.In traditional position-sensor-free frequency-changeable compressor drive scheme, start is a difficult problem always.Owing under the static situation of compressor, can't detect the counter electromotive force of motor,, it is existed start problems such as difficulty, detent torque are little so just can't learn the accurate position that rotor is initial.The no sensor compressor start technology of our original creation is divided into the several separate flow process with start-up course, makes compressor startup gradually stage by stage, progressively enters into closed-loop control from open loop control.Facts have proved the simple and effective startup that realizes the position-sensor-free compressor of this technology, and single startup success rate is also more intense to the adaptability of starting load more than 95%, and fine practical value is arranged.

Four, digital pfc pulse modulation technology.Current digital power factor correcting technology is the field, forward position of switch power technology, and various control models and scheme are also all each has something to recommend him.The digital pfc pulse modulation technology based on continuous current pattern (CCM) of our independent research is effectively proofreaied and correct the input electric power factor, and the output busbar voltage is stabilized on the reasonable target setting value.Facts have proved that this technology can match in excellence or beauty with the PFC control chip of special use, is stabilized in more than 99.5% its complete machine power factor.Effectively reduce the cost of complete machine, improved the quality of product.

Description of drawings

Fig. 1 is the hardware principle block diagram of the utility model controller.

Fig. 2 is the primitive recursive function flow chart of the utility model controller software.

Fig. 3 is the main interrupt function flow chart of the utility model controller software.

Fig. 4 is the structured flowchart of the no sensor FOC of the utility model controller (magnetic field vector control) system.

Fig. 5 is the space vector schematic diagram of the utility model controller.

Fig. 6 is the converter bridge switching parts view of the utility model controller.

Fig. 7 is the PWM dutycycle schematic diagram of the utility model controller.

Fig. 8 is the hardware elementary diagram of the utility model controller power model bus list resistor current sample circuit.

Fig. 9 is in (Sa, Sb, Sc)=(1,0,0) the current trend schematic diagram during state for the utility model controller power model adopts bus list resistor current sample circuit scheme inverter switching device.

Figure 10 is the structure flow chart that the utility model controller sliding mode observer is estimated motor position.

Figure 11 is the digital pfc system block diagram of the employing inductive current continuous mode of the utility model controller.

Figure 12 is the hardware elementary diagram of the utility model controller power model three resistor current sample circuits.

Figure 13 is in (Sa, Sb, Sc)=(1,0,0) the current trend schematic diagram during state for the utility model controller power model adopts three resistor current sample circuit scheme inverter switching devices.

The specific embodiment

Describe performance of the present utility model in detail below in conjunction with accompanying drawing, but they do not constitute to qualification of the present utility model, only give an example.Simultaneously by illustrating that advantage of the present utility model will become clear more and understanding easily.Be called the DC frequency converting air-conditioner outdoor controller again at this DC frequency converting air-conditioner compressor intelligent controller.

Embodiment one:

Embodiment one compiles all major technique features of the utility model, is the most preferred embodiment of a kind of DC frequency converting air-conditioner compressor intelligent controller of the utility model and control method thereof.

The hardware principle block diagram of the controller of embodiment one as shown in Figure 1, dotted line is with the internal hardware structure of interior representative DC frequency converting air-conditioner outdoor controller, represents controller to connect beyond the dotted line and the external function unit of control.

As shown in Figure 1, the DC frequency converting air-conditioner compressor intelligent controller of embodiment one, comprise and carry out current rectifying and wave filtering circuit (220) that is electrically connected and the power model (210) that is used to drive DC frequency-changeable compressor (140) successively, described current rectifying and wave filtering circuit (220) has the electrical interface that is used to connect electric main (150), and described power model (210) has the electrical interface that is used to connect DC frequency-changeable compressor (140); Described current rectifying and wave filtering circuit (220) the in addition Switching Power Supply (240) through being used to provide low-tension supply is electrically connected with single dsp controller (200) as core processing unit, described single dsp controller (200) also respectively with described power model (210), be used for communication buffer circuit (250) with indoor apparatus of air conditioner (100) communication, be used to drive the blower fan drive circuit (280) of fan of outdoor unit of air conditioner, be used for temperature signal is converted into and can be electrically connected by the temperature sampling circuit (270) of the signal of telecommunication of described dsp controller (200) reception, described temperature sampling circuit (270) has the electrical interface that is used to connect temperature sensor (120).As most preferred embodiment of the present utility model, in the present embodiment, described current rectifying and wave filtering circuit (220) through circuit of power factor correction (230), is electrically connected with described power model (210) and Switching Power Supply (240) respectively earlier again; Described dsp controller (200) also connects the relay (260) that is used to control air-conditioner outdoor unit cross valve (110).

Power model (210) comprises one group of resistor current sample circuit, and the preferred version of two kinds of resistor current sample circuits is provided in the present embodiment:

The preferred version one of described current sampling circuit: power model (210) comprises one group of single resistor current sample circuit, as shown in Figure 8, single resistor current sample circuit is by the direct current signal on the resistance R that is captured in bus negative terminal serial connection, by the motor phase current reconstruction technology, restore 3 phase current information of motor.In the present embodiment, this sampling resistor has utilized the overcurrent protection resistance of IPM power model (210) just, so can not increase any hardware cost.And traditional electric current detecting method is an applied current sensor detection electric current, but more expensive sensor makes system cost increase.Another kind method is to utilize the linear resistance of a plurality of cheapnesss to obtain current information, but under the limited condition of hardware, also is difficult to sometimes realize.From reducing system cost, reducing volume, the method for obtaining motor and drive system current information with single current detection technology becomes a kind of effective means.

The preferred version two of described current sampling circuit: described power model (210) comprises one group of three resistor current sample circuit, as shown in figure 12, described three resistor current sample circuits are serially connected in three resistance R 1 on the brachium pontis negative terminal, the direct current signal on R2, the R3 under described power model (210) three-phase respectively by gathering, and directly obtain the three-phase current information of motor.Described three sampling resistor R1, R2, R3 are the overcurrent protection resistance of IPM power model (210).Compare with preferred version one, the advantage of this preferred version two is that software algorithm is simple relatively, is easy to programming and control enforcement; But hardware cost is high slightly.

As shown in figure 11, the main power circuit of circuit of power factor correction (230) comprises the following components and parts that begin to be electrically connected successively from input side: diode full-wave rectifying circuit, energy storage inductor L, power tube S, booster diode D, output capacitance C, and related load; Continuous mode PFC algorithm structure is divided into outer voltage, given algorithm and current inner loop three parts; Outer voltage realization output dc voltage is followed given voltage; The electric current given algorithm produces the sinusoidal waveform consistent with input voltage, and adds permanent power voltage feedforward; Current inner loop realizes input AC current following input ac voltage waveform, finishes the PFC function.

Each hardware that below is controller is formed the partial function description:

1, the power supply of DC frequency converting air-conditioner outdoor controller is provided by electric main 220VAC (150), through transferring to about direct current 310VDC behind current rectifying and wave filtering circuit (220) and the circuit of power factor correction (230).Circuit of power factor correction (230) is used for improving power factor.As without circuit of power factor correction (230), power factor is about about 95%; After circuit of power factor correction (230) was proofreaied and correct, corresponding power factor can be stabilized in more than 99.5%.

2, the dc source after rectification is given power model (210) power supply, and after Switching Power Supply (240), for the controller complete machine provides low-tension supply.

3, the DC frequency converting air-conditioner outdoor controller is connected with indoor set controller (100), carries out communication by isolating communicating circuit (250) with indoor set, the related data and the control instruction of exchange air-conditioner control system.

4, outdoor controller as core processing unit, adopts the non-shielding system of single CPU scheme by DSP (200), effectively reduces hardware cost.

5, by DSP (200) control, drive DC frequency-changing press (140) by power model (210).Carry out refrigeration, the heat-production functions of air-conditioning.And the refrigeration of the frequency adjustment air-conditioning by changing compressor, heat power.

6, gather every temperature parameter (120) of air-conditioner outdoor unit by temperature sampling circuit (270), carry out effective control of air-conditioning work state, guarantee air conditioner refrigerating, heat and reach peak efficiency and optimum efficiency.

7, by the blower fan (130) outside relevant drive circuit (280) control room, by changing the heat exchange amount of its rotational speed regulation off-premises station.

8, by the cross valve (110) of relevant relay (260) control off-premises station, can change the refrigeration of air-conditioning and heat state.

Below describe the control method of present embodiment in detail:

In described dsp controller (200), implant control software, this control software comprises a primitive recursive function and a main interrupt function, the main interrupt function of the preferential execution of system, the described cycle in the primitive recursive function time interval is set at the moment T in ms, as select T=1ms for use, be used to carry out compressor rotary speed detection, speed ring PID adjusting, compressor position feedback compensation, control with indoor set communication, running state of air conditioner; The described main cycle in the interrupt function time interval is set at the moment t in 0.1ms much smaller than T, as select t=0.1ms for use, be used to carry out compressor phase current, DC bus-bar voltage, AC-input voltage AD sampling, coordinate transform, electric current loop PID adjusting, anti-Park conversion, space vector and calculate vector converter control, the motor rotor position estimation that SVPWM is a compressor.

Control method below in conjunction with description of drawings embodiment one controller:

The software flow pattern of primitive recursive function below describes the software flow pattern of primitive recursive function as shown in Figure 2:

1, behind the electrification reset, at first system is carried out initialization.Comprise: to the initialization of each hardware module register, the initialization of software variable initial value and the setting and the unlatching of each system break.Program just entered primitive recursive function after system initialization was finished.

2, whether determining program operation reaches the 1ms time interval, if reach 1ms then carry out flow processs such as the detection of press rotating speed, speed ring PID adjusting, press position feedback compensation.Wherein, the press rotating speed detects the rotating speed that subfunction mainly is responsible for calculating in real time according to the external feedback information of compressor press; Speed ring PID regulates the difference that subfunction then compares compressor actual frequency and target frequency, and carry out the PID closed-loop control, make compressor actual frequency automatically track target frequency, reach the purpose of effective control press frequency, the output quantity of speed ring will be as the specified rate of electric current loop; Press position feedback compensation subfunction mainly is to be the hysteresis error that produces to the compressor location estimation in order to eliminate sliding mode observer.

3, whether determining program operation reaches the 4ms time interval, if reach 4ms then carry out flow process with the indoor set communication.Mainly comprise the exchange etc. of exchange, system error message and the guarded command of air-conditioning system indoor set and off-premises station operational factor with the communication of indoor set.

4, whether determining program operation reaches the 50ms time interval, if reach 50ms then carry out PFC Voltage loop control flow.PFC (PFC) Voltage loop control is main in order to realize the effective control to system busbar voltage, and it is steady in a long-term in claimed range that busbar voltage can be purchased, and realizes boosting and the function of voltage stabilizing.

5, system then carries out running state of air conditioner control flow and system protection flow process etc. at one's leisure.Wherein, to the real-time control of compression frequency, guarantee that air-conditioning is always operating under the state of Energy Efficiency Ratio the best under the different condition such as the running state of air conditioner control flow mainly carries out air conditioner refrigerating, heat; The system protection flow process then mainly is responsible for each hardware cell of protection air-conditioner outdoor unit and all is operated in the safe range, as voltage, the current protection of controller, and protection of all temps of compressor and frequency limitation etc.

The main interrupt function flow process of system as shown in Figure 3, the time interval of this interruption is 100us, some core control algolithms such as control of the vector converter of compressor and digital power factor correcting are all broken hereinto and are realized in the function.Below the software flow pattern of main interrupt function flow process is described:

1, after the program operation reaches the time interval of 100us, then enters this interrupt function.At first analog quantitys such as the electric current of the DC bus-bar voltage of the phase current of compressor, controller, PFC inductance and AC-input voltage are carried out digitized sampling.These analog quantitys are as the external feedback and the control basis of system's control.

2, compressor phase current sampling value is carried out coordinate transform.By the Clake conversion three-phase current is transformed to the static orthogonal coordinate system of two-phase, it is transformed to the two-phase rotating coordinate system by the Park conversion.

3, the biphase current to the rotating coordinate system after the conversion carries out electric current loop PID closed-loop control.Make the direct-axis component of compressor current always remain zero, and quadrature axis component is followed the set-point of speed ring output automatically.The PID of electric current loop regulates the drive current of effectively having controlled motor, guarantees the most effective of its work.

4, the output quantity of electric current loop is carried out anti-Park conversion, it is transformed into the two-phase rest frame.Output quantity after the conversion will be used to calculate the dutycycle of SVPWM.

5,,, it is scaled the dutycycle of three-phase PWM ripple by spatial vector pulse width modulation algorithm (SVPWM) according to top output quantity.By 3 groups of PWM output ports of DSP, the control power model directly drives the DC frequency-changing press.

6, according to the dutycycle and the actual press current sampling data of the three-phase PWM ripple of previous step output, by the physical location of sliding mode observer estimation press rotor.Its angle value that estimates will be in order to the coordinate transform of next interrupt cycle.

7, the electric current and the AC-input voltage of the PFC inductance that obtains according to sampling in the first step, and the output quantity of PFC voltage close loop control in the 50ms cycle period carry out the PID closed-loop control of digital pfc electric current loop.This flow process makes the power factor that exchanges input reach 99.8%.

Fig. 4 is the structured flowchart of FOC (magnetic field vector control).As shown in Figure 4, FOC adopts two closed-loop controls, and wherein, interior ring is an electric current loop, and outer shroud is a speed ring.

Electric current loop has been realized the decoupling zero control to the permagnetic synchronous motor drive current, because the basic direct ratio of output torque of permagnetic synchronous motor and the friendship shaft current of motor, so can utilize electric current loop to control the output torque of motor indirectly.Speed ring is used for controlling the operating frequency of compressor, the dynamic response when making it can satisfy stable state when deciding frequency and require to satisfy frequency conversion again.The equation of motion according to motor: $J\frac{{\mathrm{d\ω}}_m}{\mathrm{dt}}=T_e-T_l,$ In the formula, J is the rotary inertia of rotor, ω _mBe rotor mechanical angular speed.(ω _e=p _mω _m), T _eBe output torque, T _lBe load torque.Therefore can reach Self Adaptive Control by two closed-loop controls of speed and moment of torsion to varying duty.As when the stable state, when the load of shelves compressor becomes big, can increase drive current, make the output torque of motor become big, reach the purpose of balanced load, stabilized speed.

As Fig. 4, the control flow of interior circular current ring is:

1, at first the compressor phase current is sampled, carry out the coordinate transform of electric current decoupling zero then.By the Clake conversion three-phase current is transformed to the static orthogonal coordinate system of two-phase, it is transformed to the two-phase rotating coordinate system by the Park conversion.In the two-phase rotating coordinate system, hand over shaft current just can reach the effect of control motor output torque by control.

2, the biphase current to the rotating coordinate system after the conversion carries out electric current loop PID closed-loop control.Wherein d-axis (D axle) component is the exciting current of motor, makes it be always zero; And hand over axle (Q axle) component is the torque current of motor, makes it follow the set-point of speed ring output automatically.

3, the output quantity of electric current loop is carried out anti-Park conversion, and be translated into the dutycycle of PWM ripple by space vector algorithm (SVPWM).

4, the dutycycle of the PWM ripple that calculates according to the space vector algorithm by 3 groups of PWM output ports of DSP, is exported the PWM waveform of 6 tunnel complementations, is used for controlling the power inverting bridge and directly drives the DC frequency-changing press.

As Fig. 4, the control flow of outer shroud speed ring is:

1, the dutycycle of the three-phase PWM ripple that calculates according to the space vector algorithm and actual press current sampling data are by the physical location of sliding mode observer estimation press rotor.Its angle value that estimates will be in order to the coordinate transform of next interrupt cycle and the calculating of motor speed.

2, calculate the actual motion frequency of press according to the estimated value of motor rotor position, and pass through the PID closed-loop adjustment of speed ring, make the actual motion frequency of press effectively follow target frequency, reach the automatic control of press frequency.

Fig. 5 is the space vector schematic diagram of the utility model controller; Fig. 6 is the converter bridge switching parts view of the utility model controller; Fig. 7 is the PWM dutycycle schematic diagram of the utility model controller.

Space vector algorithm (SVPWM) is that the magnetic field that stator current produces is divided into 6 limit and 6 basic vectors, 2 zero vectors mutually, as shown in Figure 5.The stator field of any direction all is to obtain by two adjacent basic vectors are synthetic.

As shown in Figure 6, all corresponding a kind of state of opening of each basic vector can arbitrarily switch 6 basic vectors by the conducting state that changes 6 switching tubes.In the form of Fig. 6, the pipe conducting is gone up in 1 representative, the following pipe turn-offed, and conducting is managed in 0 representative down, upward pipe turn-offs.For example, on vector V 1 corresponding A, under the B, conducting under the C, be equivalent to the A phase current for just, B, C phase current are for negative.Wherein, 000 and 111 represent two zero vectors respectively, because go up pipe conducting simultaneously or 3 down during pipe conducting simultaneously when 3, do not have electric current to flow in the motor or flow out.

The space vector of any direction is divided into 6 limits mutually, and each vector of limitting mutually all is to be made of two adjacent basic vectors and two zero vectors, recently changes the size and Orientation of resultant vector by the duty that changes two basic vectors.Fig. 7 is the first dutycycle schematic diagram of vector in the limit mutually, and the dutycycle of PWM ripple adopts 7 sections methods to represent that T1 represents the dutycycle of basic vector V1 among the figure, and T2 represents the dutycycle of basic vector V2, and T0 represents the dutycycle of zero vector.The modulation system of this PWM is exactly space vector pulse width modulation (SVPWM).

Fig. 8 is the hardware principle block diagram of bus list resistance sampling motor phase current reconstruction technology.By the direct current signal on the resistance R that is captured in bus negative terminal serial connection,, restore 3 phase current information of motor among the figure by the motor phase current reconstruction technology.This sampling resistor has utilized the overcurrent protection resistance of IPM power model just, so can not increase any hardware cost.And classical electric current detecting method is an applied current sensor detection electric current, but more expensive sensor makes system cost increase.Another kind method is to utilize the linear resistance of a plurality of cheapnesss to obtain current information, but under the limited condition of hardware, also is difficult to sometimes realize.From reducing system cost, reducing volume, the method for obtaining motor and drive system current information with single current detection technology becomes a kind of effective means.

The utility model adopts the motor phase current reconstruction technology: having analyzed under the complementary PWM pattern on the inverter change of current basis, now propose ac motor phase current reconstruction technology under space vector PWM (SVPWM) control mode.This technology according to inverter on off state of living in and three-phase current relation, calculates each phase current with a linear resistance sampling inverter dc bus current, realizes the phase current reconstruction of ac motor.So-called complementary output is promptly with in the inversion system shown in Figure 8, upper and lower two device for power switching of same brachium pontis, and when last brachium pontis break-over of device, following brachium pontis device is in off state, and vice versa.

As previously described, the definition switching variable is got 0 or 1 two states, and wherein the conducting of brachium pontis device for power switching is gone up in 1 expression; 0 expression brachium pontis device for power switching conducting down.8 kinds of inverter switching states shown in the form among Fig. 6 are then arranged.Wherein, (Sa, Sb, Sc)=(0,0,0) and (in the time of Sc)=(1,1,1), inverter output voltage is zero for Sa, Sb, so these two kinds of on off states of inverter are defined as nought state, and all the other 6 kinds of states is defined as effective status.When inverter switching device is in effective status, for example be in that (Sc)=(1,0,0), its current flowing path as shown in Figure 9 for Sa, Sb.As seen from Figure 9, under this state, dc bus current Idc is the A phase current of ac motor.In like manner the stator current based on off state can be expressed as follows:

Idc＝Ia?when(Sa，Sb，Sc)＝(1，0，0)

Idc＝-Ia?when(Sa，Sb，Sc)＝(0，1，1)

Idc＝Ib?when(Sa，Sb，Sc)＝(0，1，0)

Idc＝-Ib?when(Sa，Sb，Sc)＝(1，0，1)

Idc＝Ic?when(Sa，Sb，Sc)＝(0，0，1)

Idc＝-Ic?when(Sa，Sb，Sc)＝(1，1，0)

Idc＝0?when(Sa，Sb，Sc)＝(1，1，1)

Idc＝0?when(Sa，Sb，Sc)＝(0，0，0)

Fig. 9 is in (Sa, Sb, Sc)=(1,0,0) the current trend schematic diagram during state for the utility model controller power model adopts bus list resistor current sample circuit scheme inverter switching device.Therefore, according in the opportune moment of effective status dc bus resistance being sampled, with regard to the three-phase current of energy reconstruct motor with co-relation.

Figure 13 is in (Sa, Sb, Sc)=(1,0,0) the current trend schematic diagram during state for the utility model controller power model adopts three resistor current sample circuit scheme inverter switching devices.As previously mentioned, adopt three resistor current sample circuit schemes, can directly obtain the three-phase current information of motor; Make software algorithm simple relatively, be easy to programming and control enforcement.

The utility model adopts a kind of computation model that is called as sliding mode observer to estimate motor position.

The sliding mode observer computation model is to set up state equation according to the model of motor under two-phase rest frame (alpha-beta coordinate system), it comes correction model by the deviation of constantly obtaining between electric current estimated value and the measured value, deviation is between the two faded away, to realize estimation to angle of rotor and speed.To estimate the poor of electric current and stator measured current, bring saturation function into, carry out phase shift compensation with the adaptive digital low pass filter then, can obtain the sin cos functions of rotor position angle by the output result.

Figure 10 estimates the structure flow chart of motor position for sliding mode observer.The concrete operation flow process is as follows:

1, sets up state equation according to the model of plug-in permanent magnet synchronous motor under two-phase rest frame (alpha-beta coordinate system) $\frac{d\stackrel{\·}{i_S}}{\mathrm{dt}}=(-\frac{R_S}{L_d}+\frac{j{\mathrm{\ω}}_r(L_d-L_q)}{L_d})\stackrel{\·}{i_S}+\frac{1}{L_d}(\stackrel{\·}{u_S}-\stackrel{\·}{e_S}),$ Calculate the estimation electric current

2, relatively estimate electric current

With actual current i _SDifference, the calculating by one group of saturation function then obtains comprising the variable z of counter electromotive force information _S

3, because signal z _SIn except comprising counter electromotive force information, also comprise many high fdrequency components and noise, so after it is carried out LPF, just obtained useful counter electromotive force information

4, because counter electromotive force In comprise the sin cos functions of position angle, so the magnetic linkage angle estimation by arctan function, the angle information that just obtains

5, owing to adopt low pass filter to obtain counter electromotive force, introduced phase delay.Therefore, need make a phase delay table, command adapted thereto speed omega when obtaining operation according to the phase response of low pass filter _rAngle of phase displacement Δ θ,

Right

Compensate, obtain the angle of rotor estimated value at last

That is: ${\widetilde{\mathrm{\θ}}}_e=\widetilde{{\mathrm{\θ}}_{\mathrm{eu}}}+\mathrm{\Δ\θ}.$

This controller adopts digital control single phase boost PFC (PFC) technology, and this digital pfc technology is to adopt inductive current continuous mode (ContinuouS.Onductionmode, Active Power Factor Correction Technology CCM).The PFC of CCM is controlled to be the multiplier principle, and switching frequency is fixed, and the switching tube conduction ratio changes along with inductive current, and it is sinusoidal given finally to make average inductor current follow the tracks of, and realizes PFC.

Figure 11 is for adopting digital power factor correcting (PFC) system block diagram of inductive current continuous mode, and main power circuit is made up of power tube Q, booster diode D, energy storage inductor L and output capacitance C, and input side also comprises the diode full-wave rectifying circuit.Continuous mode PFC algorithm structure is divided into outer voltage, given algorithm and current inner loop three parts.Outer voltage realization output dc voltage is followed given voltage; The electric current given algorithm produces the sinusoidal waveform consistent with input voltage, and adds permanent power voltage feedforward; Current inner loop realizes input AC current following input ac voltage waveform, finishes the PFC function.

The workflow of digital pfc is as follows:

1, sampling busbar voltage U _o, and with set-point U _rCompare, then its error is carried out PID and regulate.After finishing Voltage loop control, the U of output _mAs calculating the given of electric current loop.

2, carry out the AD sampling to exchanging the side input voltage, obtain the AC-input voltage u after the rectification _lOutput U with itself and Voltage loop _mMultiply each other and obtain the given i of electric current loop _Mo, because busbar voltage keeps constant substantially, make the output of Voltage loop also keep constant substantially, so the given i of the electric current loop behind the process multiplier _MoIt is the waveform that is directly proportional with AC-input voltage basically.Through the current loop control of back, just guaranteed the tracking of input current, the PFC of realization again to input voltage.

3, by sampling resistor R to the input series connection _sSample, can obtain input current signal I _sBy to I _sAnd i _MoError carry out PID control, can obtain the dutycycle of switching tube S, by PWM output pin and the IGBT drive circuit gauge tap pipe S of DSP, guarantee actual current I then _sThe tracing preset current i _Mo, realize current closed-loop control.

4, through above voltage close loop control and current closed-loop control, realized APFC, and made busbar voltage be stabilized on system's required voltage value, the ripple current of the bus filter capacitor that reduces.Can reduce the size and the volume of filter capacitor, reduce the hardware cost of system.

Use the above-mentioned compressor intelligent controller and can obtain a kind of high performance DC frequency converting air-conditioner machine, it disposes the foregoing description one described compressor intelligent controller, each the external electrical interface that is about to described controller is electrically connected with DC frequency converting air-conditioner machine associated components, as shown in Figure 1, mainly comprise: power model (210) is connected with DC frequency-changeable compressor (140), communication buffer circuit (250) is connected with indoor apparatus of air conditioner (100), temperature sampling circuit (270) is connected with temperature sensor (120), and relay (260) is connected with air-conditioner outdoor unit cross valve (110).When current rectifying and wave filtering circuit (220) after indoor apparatus of air conditioner (100) is connected electric main (150), single dsp controller (200) as core processing unit just can be carried out the Based Intelligent Control of described compressor intelligent controller to the DC frequency converting air-conditioner machine by moving the control software that it is implanted.

Embodiment two:

Embodiment two has only saved the relay (260) that is used to control air-conditioner outdoor unit cross valve (110) in the hardware configuration of the controller of embodiment one.Be used for single refrigerating function or single heat-production functions air conditioner.Its corresponding control methods is also identical with embodiment one.Saved the relay (260) that is used to control air-conditioner outdoor unit cross valve (110) in the hardware configuration because of controller, its adaptive DC frequency converting air-conditioner machine do not need outer machine cross valve (110) yet, therefore, with this DC frequency converting air-conditioner machine that obtains can not freeze, the mode of heating switches, and only has single refrigerating function or single heat-production functions; Be applicable to the user of single refrigerating function or single heat-production functions demand.

Embodiment three:

Embodiment three has only saved circuit of power factor correction (230) in the hardware configuration of the controller of embodiment one.Its current rectifying and wave filtering circuit (220) directly is electrically connected with the power model that is used to drive DC frequency-changeable compressor (140) (210), and the same Switching Power Supply (240) through being used to provide low-tension supply in addition of current rectifying and wave filtering circuit (220) is electrically connected with single dsp controller (200) as core processing unit; Other hardware configuration are identical with embodiment one with annexation.Accordingly, its corresponding control methods has also saved the part flow process relevant with PFC, and other and embodiment one are identical, no longer describe in detail at this.Inferior a little with this DC frequency converting air-conditioner acc power factor index that obtains, be about about 95%; But has the relatively low advantage of cost.

Embodiment four:

Embodiment four has only saved the relay (260) and circuit of power factor correction (230) that is used to control air-conditioner outdoor unit cross valve (110) in the hardware configuration of the controller of embodiment one.Its current rectifying and wave filtering circuit (220) directly is electrically connected with the power model that is used to drive DC frequency-changeable compressor (140) (210), and the same Switching Power Supply (240) through being used to provide low-tension supply in addition of current rectifying and wave filtering circuit (220) is electrically connected with single dsp controller (200) as core processing unit; Other hardware configuration are identical with embodiment one with annexation.Accordingly, its corresponding control methods has also saved the PFC part, and other and embodiment one are identical, also no longer describes in detail at this.With this DC frequency converting air-conditioner machine that obtains can not freeze, the mode of heating switches, and only has single refrigerating function or single heat-production functions; Power factor specification is inferior a little, is about about 95%; But have the relatively low advantage of cost, be applicable to the user of single refrigerating function or single heat-production functions demand.

More than the described DC frequency converting air-conditioner machine of each embodiment all have high performance operation, comfortable quiet, energy-conserving and environment-protective, distinguishing feature that energy consumption is low; Compare with common traditional fixed frequency air conditioner, but saves energy reaches more than 40%.

Claims (11)

1, a kind of DC frequency converting air-conditioner compressor intelligent controller, comprise and carry out current rectifying and wave filtering circuit (220) that is electrically connected and the power model (210) that is used to drive DC frequency-changeable compressor (140) successively, described current rectifying and wave filtering circuit (220) has the electrical interface that is used to connect electric main (150), and described power model (210) has the electrical interface that is used to connect DC frequency-changeable compressor (140); It is characterized in that, described current rectifying and wave filtering circuit (220) the in addition Switching Power Supply (240) through being used to provide low-tension supply is electrically connected with single dsp controller (200) as core processing unit, described single dsp controller (200) also respectively with described power model (210), be used for communication buffer circuit (250) with indoor apparatus of air conditioner (100) communication, be used to drive the blower fan drive circuit (280) of fan of outdoor unit of air conditioner, be used for temperature signal is converted into and can be electrically connected by the temperature sampling circuit (270) of the signal of telecommunication of described dsp controller (200) reception, described temperature sampling circuit (270) has the electrical interface that is used to connect temperature sensor (120).

2, DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 1 is characterized in that, described dsp controller (200) also connects the relay (260) that is used to control air-conditioner outdoor unit cross valve (110).

3, DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 1, it is characterized in that, described current rectifying and wave filtering circuit (220) through power factor correction circuit (230), is electrically connected with described power model (210) and Switching Power Supply (240) respectively earlier again.

4, DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 1, it is characterized in that, described current rectifying and wave filtering circuit (220) through power factor correction circuit (230), is electrically connected with described power model (210) and Switching Power Supply (240) respectively earlier again; Described dsp controller (200) also connects the relay (260) that is used to control air-conditioner outdoor unit cross valve (110).

5, as each described DC frequency converting air-conditioner compressor intelligent controller of claim 1 to 4, it is characterized in that, described power model (210) comprises one group of single resistor current sample circuit, described single resistor current sample circuit is by the direct current signal on the resistance R that is captured in described power model (210) bus negative terminal serial connection, by the motor phase current reconstruction technology, restore the three-phase current information of motor.

6, DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 5 is characterized in that, described sampling resistor is the overcurrent protection resistance of IPM power model (210).

7, as each described DC frequency converting air-conditioner compressor intelligent controller of claim 1 to 4, it is characterized in that, described power model (210) comprises one group of three resistor current sample circuit, described three resistor current sample circuits are serially connected in three resistance R 1 on the brachium pontis negative terminal, the direct current signal on R2, the R3 under described power model (210) three-phase respectively by gathering, and directly obtain the three-phase current information of motor.

8, DC frequency converting air-conditioner compressor intelligent controller as claimed in claim 7 is characterized in that, described three sampling resistor R1, R2, R3 are the overcurrent protection resistance of IPM power model (210).

9, as claim 3 or 4 described DC frequency converting air-conditioner compressor intelligent controllers, it is characterized in that, the main power circuit of described circuit of power factor correction (230) comprises the following components and parts that begin to be electrically connected successively from input side: diode full-wave rectifying circuit, energy storage inductor L, power tube S, booster diode D, output capacitance C, and related load; Continuous mode PFC algorithm structure is divided into outer voltage, given algorithm and current inner loop three parts; Outer voltage realization output dc voltage is followed given voltage; The electric current given algorithm produces the sinusoidal waveform consistent with input voltage, and adds permanent power voltage feedforward; Current inner loop realizes input AC current following input ac voltage waveform, finishes the PFC function.

10, as each described DC frequency converting air-conditioner compressor intelligent controller of claim 1 to 4, in described dsp controller (200), implant control software, employing abbreviates the no sensor magnetic field vector control mode of FOC as, described FOC adopts two closed-loop controls, interior ring is electric current loop, and outer shroud is a speed ring; Electric current loop is realized the decoupling zero control to the compressor permanent magnet synchronous electric motor drive current, controls the output torque of motor indirectly; Speed ring is used for controlling the operating frequency of compressor, the dynamic response when making it can satisfy stable state when deciding frequency and require to satisfy frequency conversion again.

11, a kind of DC frequency converting air-conditioner machine is characterized in that, it disposes as each described compressor intelligent controller of claim 1 to 4.

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