阅读说明：本技术 电机控制电路及空调器 (Circuit for controlling motor and air conditioner ) 是由 杨建宁 于 2019-08-23 设计创作，主要内容包括：本发明公开一种电机控制电路及空调器,电机控制电路包括电流补偿电路、驱动电源电路和控制器,电流补偿电路具有多个电流值不同的电流补偿支路,驱动电源电路输出驱动电源信号驱动电机运行。控制器获取当前电机运行功率,并根据当前电机运行功率确定驱动电源信号需要的谐波补偿电流值,控制与谐波补偿电流值对应的电流补偿支路接入至驱动电源电路,以对驱动电源信号进行谐波电流补偿。本发明解决了现有技术中滤波器在谐波数量较大时容易出现过载甚至烧毁的技术问题。(The present invention discloses a kind of circuit for controlling motor and air conditioner, circuit for controlling motor includes current compensation circuit, driving power circuit and controller, the current compensation branch that current compensation circuit has multiple current values different, the operation of driving power circuit output driving power signal drive motor.Controller obtains current motor and runs power, and the harmonic compensation current value that power determines driving power signal needs is run according to current motor, it controls current compensation branch corresponding with harmonic compensation current value and accesses to driving power circuit, to carry out harmonic current compensation to driving power signal.The present invention solves the technical issues of filter in the prior art is easy to appear overload when harmonic wave quantity is larger or even burns.)

1. a kind of circuit for controlling motor, which is characterized in that the circuit for controlling motor includes:

Current compensation circuit, with the different current compensation branch of multiple current values；

Driving power circuit is run for output driving power supply signal driving motor；

Controller has current compensation input terminal, the output of the current compensation input terminal and multiple current compensation branches End connection；

The controller for obtaining current motor operation power, and runs power according to the current motor and determines the drive The harmonic compensation current value that dynamic power supply signal needs controls current compensation branch access corresponding with the harmonic compensation current value To the driving power circuit, to carry out harmonic current compensation to the driving power signal.

2. circuit for controlling motor as described in claim 1, which is characterized in that the driving power circuit includes:

Current rectifying and wave filtering circuit, for carrying out rectifying and wave-filtering processing to the ac supply signal of input；

PFC control circuit, for exporting PFC control signal；

Multichannel pfc circuit carries out power factor (PF) to rectifying and wave-filtering treated power supply signal for controlling signal according to the PFC Correction process is exported to inverter circuit, is run with driving motor.

3. circuit for controlling motor as claimed in claim 2, which is characterized in that the current compensation circuit includes controlled end and defeated Outlet, each pfc circuit include input, output end and controlled end, and the PFC control circuit includes multiple control signal Output end and biasing resistor input terminal, the driving power circuit includes input, output end and detects signal output end, described Controller includes electric machines test signal input part and control signal output；

The input terminal of pfc circuit described in multichannel is connect with the output end of the current rectifying and wave filtering circuit, pfc circuit described in multichannel it is defeated Outlet is connect with the input terminal of the inverter circuit, and the output end of the inverter circuit is connected to motor；Multiple pfc circuits Controlled end and the PFC control circuit the one-to-one connection of multiple control signal output end；The biasing of the PFC control circuit Resistance input terminal is connect with the output end of the current compensation circuit；The control signal output of the controller and the electric current The controlled end of compensation circuit connects.

4. circuit for controlling motor as claimed in claim 3, which is characterized in that the current compensation branch includes first switch tube And biasing resistor, the controlled end of the first switch tube are the controlled end of the current compensation circuit, the first switch tube Input terminal is connect with the first end of the biasing resistor, and the output end of the first switch tube is the defeated of the current compensation circuit Outlet；The second end of the biasing resistor is connect with the first power supply.

5. circuit for controlling motor as claimed in claim 4, which is characterized in that the biasing resistor of multiple current compensation branches Same first power supply or respectively identical first power supply of access output size are accessed,

The motor operation power of the preset multiple grades of controller, and configure the motor operation power and multiple electricity of multiple grades The mapping relations of the biasing resistor of stream compensation branch, the resistance value of the biasing resistor of multiple current compensation branches is according to multiple etc. The grade size of the motor operation power of grade is correspondingly arranged, to control corresponding electric current benefit according to the harmonic compensation current value It repays branch and accesses to the driving power circuit, to carry out harmonic current compensation to the driving power signal.

6. circuit for controlling motor as claimed in claim 5, which is characterized in that the resistance of the biasing resistor of the current compensation branch Value and the grade of motor operation power are positively correlated.

7. circuit for controlling motor as claimed in claim 4, which is characterized in that the first switch tube is optocoupler, described Optocoupler includes light-emitting tube and light receiving tube, and the input terminal of the light-emitting tube is the controlled end of the first switch tube, The output end of the light-emitting tube is grounded, and the input terminal of the light receiving tube is the input terminal of the first switch tube, the light The output end of reception pipe is the output end of the first switch tube.

8. circuit for controlling motor as claimed in claim 2, which is characterized in that the controller further includes supply voltage detection End, the supply voltage test side of the controller is connect with the input terminal of pfc circuit described in multichannel；

The controller, the supply voltage after being also used to detect current rectifying and wave filtering circuit rectifying and wave-filtering, and according to the current electricity of acquisition Machine operation power and the supply voltage of detection determine the harmonic compensation current value that the driving power signal needs, control with The corresponding current compensation branch of the harmonic compensation current value accesses to the driving power circuit, to believe the driving power Number carry out harmonic current compensation.

9. a kind of circuit for controlling motor, which is characterized in that the circuit for controlling motor includes:

Current compensation circuit, with the different current compensation branch of multiple current values；

Driving power circuit, for accessing AC power source, and AC power source successively carried out rectifying and wave-filtering, Active PFC and Output driving power supply signal driving motor is run after inversion processing；

Controller, has current compensation input terminal, and the current compensation input terminal is connect with multiple current compensation branches；

The controller, for detecting the supply voltage after current rectifying and wave filtering circuit rectifying and wave-filtering, and according to the power supply of detection Voltage determines the harmonic compensation current value that the driving power signal needs, and controls electricity corresponding with the harmonic compensation current value Stream compensation branch accesses to the driving power circuit, to carry out harmonic current compensation to the driving power signal.

10. a kind of air conditioner, which is characterized in that including air conditioner mainboard, casing and such as any one of claim 1-8 or such as Circuit for controlling motor as claimed in claim 9, the circuit for controlling motor are set on air conditioner mainboard, and are set to the machine Inside shell.

Technical field

The present invention relates to technical field of motors, in particular to circuit for controlling motor and air conditioner.

Background technique

Summary of the invention

The main object of the present invention is to propose a kind of circuit for controlling motor, it is intended to solve existing filter in harmonic wave quantity The technical issues of being easy to appear overload when larger or even burning.

To achieve the above object, the present invention proposes that a kind of circuit for controlling motor, the circuit for controlling motor include:

Current compensation circuit, with the different current compensation branch of multiple current values；

Driving power circuit is run for output driving power supply signal driving motor；

Controller has current compensation input terminal, the current compensation input terminal and multiple current compensation branches Output end connection；

The controller for obtaining current motor operation power, and runs power according to the current motor and determines institute The harmonic compensation current value of driving power signal needs is stated, current compensation branch corresponding with the harmonic compensation current value is controlled The driving power circuit is accessed to, to carry out harmonic current compensation to the driving power signal.

Optionally, the driving power circuit includes:

Current rectifying and wave filtering circuit, for carrying out rectifying and wave-filtering processing to the ac supply signal of input；

PFC control circuit, for exporting PFC control signal；

Multichannel pfc circuit carries out power to rectifying and wave-filtering treated power supply signal for controlling signal according to the PFC Factor correction processing output is run to the inverter circuit with driving motor.

Optionally, the current compensation circuit includes controlled end and output end, each pfc circuit include input terminal, Output end and controlled end, the PFC control circuit include multiple control signal output end and biasing resistor input terminal, the driving Power circuit include input, output end and detection signal output end, the controller include electric machines test signal input part and Control signal output；

The input terminal of pfc circuit described in multichannel is connect with the output end of the current rectifying and wave filtering circuit, pfc circuit described in multichannel Output end connect with the input terminal of the inverter circuit, the output end of the inverter circuit is connected to motor；The pfc circuit Controlled end connect with the control signal output of the PFC control circuit；The biasing resistor input terminal of the PFC control circuit With the one-to-one connection of output end of the current compensation circuit；The control signal output of the controller and the current compensation The controlled end of circuit connects.

Optionally, the current compensation branch includes first switch tube and biasing resistor, the first switch tube it is controlled End is the controlled end of the current compensation circuit, the first end company of the input terminal of the first switch tube and the biasing resistor It connects, the output end of the first switch tube is the output end of the current compensation circuit；The second end of the biasing resistor and the The connection of one power supply.

Optionally, the biasing resistor of multiple current compensation branches accesses same first power supply or respectively accesses defeated Identical first power supply of size out,

The motor operation power of the preset multiple grades of controller, and configure the motor operation power of multiple grades and more The mapping relations of the biasing resistor of a current compensation branch, the resistance value of the biasing resistor of multiple current compensation branches is according to more The grade size of the motor operation power of a grade is correspondingly arranged, to control corresponding electricity according to the harmonic compensation current value Stream compensation branch accesses to the driving power circuit, to carry out harmonic current compensation to the driving power signal.

Optionally, the resistance value of the biasing resistor of the current compensation branch and the grade of motor operation power are positively correlated.

Optionally, the first switch tube is optocoupler, and the optocoupler includes light-emitting tube and light receiving tube, institute The input terminal for stating light-emitting tube is the controlled end of the first switch tube, and the output end of the light-emitting tube is grounded, and the light connects The input terminal of closed tube is the input terminal of the first switch tube, and the output end of the light receiving tube is the defeated of the first switch tube Outlet.

Optionally, the controller further includes supply voltage test side, the supply voltage test side of the controller and more The input terminal of pfc circuit described in road connects；

The controller, the supply voltage after being also used to detect current rectifying and wave filtering circuit rectifying and wave-filtering, and working as according to acquisition Front motor operation power and the supply voltage of detection determine the harmonic compensation current value that the driving power signal needs, control It makes current compensation branch corresponding with the harmonic compensation current value and accesses to the driving power circuit, to the driving electricity Source signal carries out harmonic current compensation.

To achieve the above object, the present invention also proposes that a kind of circuit for controlling motor, the circuit for controlling motor include:

Current compensation circuit, with the different current compensation branch of multiple current values；

AC power source for accessing AC power source, and is successively carried out rectifying and wave-filtering, power factor (PF) school by driving power circuit Just and after inversion processing output driving power supply signal driving motor is run；

Controller, has current compensation input terminal, and the current compensation input terminal and multiple current compensation branches connect It connects；

The controller, for detecting the supply voltage after detecting current rectifying and wave filtering circuit rectifying and wave-filtering, and according to detection The supply voltage determines the harmonic compensation current value that the driving power signal needs, control and the harmonic compensation current value Corresponding current compensation branch accesses to the driving power circuit, to carry out harmonic current benefit to the driving power signal It repays.

To achieve the above object, the present invention also proposes a kind of air conditioner, including air conditioner mainboard, casing and as described above Circuit for controlling motor, the circuit for controlling motor is set on air conditioner mainboard, and is set to the casing internal.

The present invention in circuit for controlling motor by being arranged current compensation circuit, driving power circuit and controller, electric current The current compensation branch that compensation circuit has multiple current values different, driving power circuit output driving power signal drive motor Operation, and current motor operation power is detected, controller obtains current motor and runs power, and is run according to the current motor Power determines the harmonic compensation current value that the driving power signal needs, and controls electricity corresponding with the harmonic compensation current value Stream compensation branch accesses to the driving power circuit, to carry out harmonic current compensation to the driving power signal.The present invention The harmonic compensation current value needed is determined by detection motor operation power, and accesses suitable current compensation branch to the drive Dynamic power supply signal carries out harmonic current compensation, reduces harmonic wave from source in such a way that this is by carrying out current compensation to harmonic wave Generation.Solve the problems, such as that filter is easy to appear overload when harmonic wave quantity is larger or even burns.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with The structure shown according to these attached drawings obtains other attached drawings.

Fig. 1 is the module diagram of one embodiment of circuit for controlling motor of the present invention；

Fig. 2 is the module diagram of one embodiment of circuit for controlling motor of the present invention；

Fig. 3 is the schematic diagram of the current compensation subcircuits of circuit for controlling motor of the present invention；

Fig. 4 is the PFC control circuit of circuit for controlling motor of the present invention and the circuit diagram of multichannel pfc circuit；

Fig. 5 is the block diagram of the first chip in the present invention.

The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description is somebody's turn to do retouching for " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention It states and is used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated technology spy The quantity of sign." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one of the features.

The present invention proposes a kind of circuit for controlling motor, holds for solving filter in the prior art when harmonic wave quantity is larger Easily there is the problem of overload is even burnt.

In one embodiment of this invention, as shown in Figure 1, circuit for controlling motor includes current compensation circuit 10, driving electricity Source circuit 30 and controller 20.Controller 20 has current compensation input terminal, the current compensation input terminal and multiple electricity The output end connection of stream compensation branch.

Wherein, the current compensation branch that current compensation circuit 10 has multiple current values different, driving power circuit 30 are defeated 50 driving motor of driving power signal is run out, and detects current motor operation power, and controller 20 is according to the current motor Operation power determines the harmonic compensation current value that the driving power signal needs, and controls corresponding with the harmonic compensation current value Current compensation branch access to the driving power circuit 30 to the driving power signal carry out harmonic current compensation progress Harmonic current compensation, to correct the driving power signal of the driving power circuit output.

In the process, it needs in advance to test the different operation power of motor 40, with the determination current motor Generated harmonic signal size under power is run, the corresponding required harmonic compensation current of different motor operation power is obtained Value, this test process can carry out in laboratory, or test after circuit for controlling motor finished product it, to obtain Under the different operation power situations of motor 40, the corresponding harmonic compensation current value for eliminating low-order harmonic.In practical applications, right The different operation power for answering motor 40, can generate different harmonic signals size, by carrying out harmonic current benefit to these harmonic waves It repays, accesses suitable harmonic compensation current value, harmonic wave can be corrected, that is, correct driving power signal at this time, generate it Harmonic wave tails off, so as to avoid because harmonic wave it is larger caused by motor overload even burn the case where, in various motor operation function Under rate, reduce harmonic signal, and hence it is also possible to make the work of motor 40 under a variety of different motor operation power situations, What it is such as script normal work is motor operation power greater than 70% rated power, and is the specified function of 0-70% in motor operation power The case where being easy to appear various overloads when rate or even burning, and obtained in test under different motor operation power situations, it will be right After the harmonic compensation current value for the harmonic carcellation signal answered accesses suitable current compensation branch later, it can be further reduced humorous Wave, when so that motor operation power being greater than the 30% of 30% rated power, motor 40 can be worked normally, to expand motor 40 job applications range.

Specifically, the setting of harmonic compensation current value how is carried out, below can be one of embodiment: actual test When middle motor operation power is 30% rated power, electric current at this time is too small, and driving power signal is interfered, and waveform becomes Change so that 3,5,7 inferior low-order harmonics are very big, then plus one bigger (specific value is determined according to test result) harmonic wave Compensation current.When motor operation power is 60% motor rated power, electric current at this time is bigger, driving power signal It is not easily susceptible to interfere, waveform variation is smaller, and 3,5,7 subharmonic are smaller, and can adding one, smaller (specific value is according to test As a result determine) harmonic compensation current value.Waveform is fine when fully loaded (rated operation), and there is no need to harmonic compensation electricity is arranged Flow valuve does not need connection current compensation branch.

It should be noted that any connection relationship for realizing signal transmitting between above-mentioned each functional circuit, and it is unlimited It is fixed, in the present embodiment, realize that signal transmits between above-mentioned each functional circuit using following connection relationship, specifically, such as Fig. 1 institute Show, the current compensation circuit 10 include controlled end and output end, the driving power circuit 30 include input, output end and Signal output end is detected, the controller 20 includes electric machines test signal input part and control signal output, and the electric current is mended The controlled end for repaying circuit 10 is connect with the control signal output of the controller 20, the output end of the current compensation circuit 10 It is connect with the input terminal of the driving power circuit 30.The output end of the driving power circuit 30 is connect with motor 40, described The detection signal output end of driving power circuit 30 is connect with the detection signal input part of the controller 20.

Optionally, as shown in Fig. 2, the driving power circuit further includes current rectifying and wave filtering circuit 301, PFC (Power Factor Correction, PFC) control circuit 302, multichannel pfc circuit 303 and inverter circuit 304, multichannel institute Stating pfc circuit includes input, output end and controlled end, and the PFC control circuit 302 includes control signal output and biasing The input terminal of resistance input terminal, pfc circuit described in multichannel is electrically connected with the output of the current rectifying and wave filtering circuit 301, described in multichannel The output end of pfc circuit is connect with the input terminal of the inverter circuit 304, and the output end and motor of the inverter circuit 304 connect It connects.The one-to-one connection of multiple control signal output end of the controlled end of pfc circuit described in multichannel and the PFC control circuit 302. The biasing resistor input terminal of PFC control circuit 302 is connect with the output end of the current compensation circuit 10.

Wherein, the ac supply signal of 301 pairs of current rectifying and wave filtering circuit inputs carries out rectifying and wave-filtering processing, PFC control circuit It exports PFC and controls signal, multichannel pfc circuit controls signal according to the PFC and carries out to rectifying and wave-filtering treated power supply signal To the inverter circuit 304, the signal that inversion handles 304 pairs of multichannel pfc circuit outputs is carried out for Active PFC processing output Inversion processing, is run with driving motor.Wherein, PFC control circuit 302, multichannel pfc circuit 303 physical circuit can refer to Fig. 5 It realizes.

Optionally, the controller 20 further includes supply voltage test side, the supply voltage test side of the controller 20 It is connect with the input terminal of pfc circuit described in multichannel.

Wherein, controller 20 is also used to detect the supply voltage after 301 rectifying and wave-filtering of current rectifying and wave filtering circuit, according to the electricity Source voltage determines the harmonic compensation current value that the driving power signal needs, and controls corresponding with the harmonic compensation current value Current compensation branch accesses to the driving power circuit and carries out harmonic current compensation to the driving power signal, to correct State the driving power signal of driving power circuit output.The harmonic compensation current value of the current compensation branch accessed at this time is according to survey Examination obtains under different supply voltages, and the harmonic compensation current value of corresponding harmonic carcellation signal determines, under normal circumstances, works as electricity When source voltage is lower, electric current is bigger, and harmonic signal is smaller, therefore does not also need very big harmonic compensation current value.Work as electricity When source voltage is relatively high, electric current reduces accordingly, and harmonic signal is bigger, then just needing to increase harmonic compensation current value.Tool The corresponding harmonic compensation current value needs of the voltage value of the input voltage of body are measured according to experiment.At this time according to supply voltage to humorous Wave carries out current compensation, and the effect of driving power signal waveform correction may be implemented, so as on the source that generates from harmonic wave Reduce the quantity of harmonic wave.It is worth noting that, " determining the harmonic compensation electricity that the driving power signal needs according to supply voltage The scheme of flow valuve ", which could alternatively be, " runs the harmonic compensation that power determines the driving power signal needs according to current motor The scheme of current value ", the two can also carry out simultaneously, it is only necessary to while supply voltage and current motor operation power are acquired to build Vertical associated harmonic compensation current relationship.

Optionally, as shown in figure 3, the current compensation branch includes first switch tube and biasing resistor R1, described first The controlled end of switching tube is the controlled end of the current compensation circuit 10, the input terminal of the first switch tube and the biased electrical The first end connection of R1 is hindered, the output end of the first switch tube is the output end of the current compensation circuit 10；The biasing The second end of resistance R1 is connect with the first power supply.

Wherein, the motor operation power has multiple gears changed step by step, in each current compensation branch The resistance value of biasing resistor correspond to the motor operation power gear setting, with the gear of motor operation power control under, It is accessed with suitable current compensation branch and carries out harmonic current compensation, to correct driving power signal, to reduce harmonic wave.Access It carries out harmonic current compensation and specifically calculates the corresponding first switch tube of opening, different harmonic wave electricity is realized by the difference of biasing resistor Stream compensation.When the control signal for the controller 20 that the controlled end of first switch tube receives is open signal, by biasing resistor R1 accesses PFC control circuit 302, at this point, the biased electrical resistance value of the biasing resistor of circuit for controlling motor access is biasing resistor The biased electrical resistance value of R1.In the present invention, by the way that multichannel current compensation branch is arranged, and in multichannel current compensation branch respectively The biased electrical resistance value of biasing resistor R1 is set, after first switch tube conducting, generates a harmonic compensation in current compensation branch Current value, at this point, harmonic compensation current value I1 is equal to the first supply voltage U1 divided by biasing resistor resistance value R1 (I1=U1/R1), Then by the multi-way control signals of controller 20 control the different harmonic compensation current values in multichannel current compensation branch according to It needs to access PFC control circuit 302, the access of different harmonic compensation current values is realized with this.

Optionally, the biasing resistor of multiple current compensation branches accesses same first power supply or respectively accesses defeated Identical first power supply of size out, the motor operation power of the preset multiple grades of controller, and configure multiple grades Motor operation power and multiple current compensation branches biasing resistor mapping relations, multiple current compensation branches it is inclined The resistance value for setting resistance is correspondingly arranged according to the grade size of the motor operation power of multiple grades, according to the harmonic compensation Current value controls corresponding current compensation branch and accesses to the driving power circuit to driving power signal progress harmonic wave When current compensation, the driving power signal of the driving power circuit output is corrected.After limiting the first power supply size, for electricity Machine runs power and harmonic wave compensation current, acquires the motor operation power of multiple grades and the biasing of multiple current compensation circuits The mapping relations of resistance.

Wherein, when the value of the first power supply is fixed, it is only necessary to be equal to voltage divided by resistance according to harmonic compensation current value It obtains, therefore, the voltage value of the first power supply can also be not fixed, it is only necessary to guarantee that the harmonic compensation current value of setting corresponds to motor fortune The grade size of row power is correspondingly arranged.When the first supply voltage is fixed, can directly in the resistance value of biasing resistor and Mapping relations are established between harmonic compensation current value, it is more convenient.It is worth noting that, at this time can also be with preset rectifying and wave-filtering electricity The mapping relations of the biasing resistor of supply voltage and multiple current compensation branches after 301 rectifying and wave-filtering of road.It can also be with preset electricity The mapping relations of the biasing resistor of source voltage, motor operation power and multiple current compensation branches.

Optionally, the resistance value of the biasing resistor of the current compensation branch and the grade of motor operation power are positively correlated.Institute The grade of the resistance value and supply voltage of stating the biasing resistor of current compensation branch is negatively correlated.

Optionally, the first switch tube is optocoupler IC1, and the optocoupler includes light-emitting tube and light-receiving Pipe, the input terminal of the light-emitting tube are the controlled end Contrul of the first switch tube., the input terminal of the light-emitting tube For the input terminal of the first switch tube, the input terminal of the light-emitting tube is the first switch tube, the light and then longevity The output end of light is the output end IO of the first switch tube.

Wherein, optocoupler IC1 works under the action of the control signal of controller 20, controlled as optocoupler IC1 When the control signal for terminating the controller 20 being subject to is open signal, biasing resistor R1 is accessed into PFC control circuit 302, at this point, The harmonic compensation current value of circuit for controlling motor access is the current value on biasing resistor R1.Optocoupler IC1 will be controlled simultaneously Signal processed and resistive isolation come, and may make to the harmonic compensation current value of access PFC control circuit 302 to avoid control signal At influence.The resistance value of biasing resistor R1 is also known as biased electrical resistance value.

Optionally, circuit for controlling motor can be applied to compressor.

Wherein, when circuit for controlling motor is applied to compressor, circuit for controlling motor reduces low-order harmonic, can also make A variety of different motor operation power (compressor rated power percentage) range of compressor operating expands, and will not be to compression Machine causes irreversible damage.

Optionally, the circuit for controlling motor is applied to blower.

Wherein, when circuit for controlling motor is applied to blower, circuit for controlling motor reduces low-order harmonic, can also make wind Machine 40 works in the range expansion of a variety of different motor operation power (blower rated power percentage), and will not make to motor At irreversible damage.

Optionally, the tune of the harmonic compensation current value of the preset motor operation power of the controller 20 and current compensation branch Section relationship: when the motor operation power becomes larger, reducing the harmonic compensation current value of the current compensation branch, that is, increases inclined Set resistance value；When the motor operation power becomes smaller, increases the harmonic compensation current value of the current compensation branch, that is, reduce The biased electrical resistance value of the current compensation branch.

Wherein, motor operation power becomes larger change of the real work power for referring to motor 40 at this time relative to rated power that become smaller Change trend, when the motor operation power becomes larger, real work power is close to rated power, and electric current is larger at this time, and waveform becomes Change is smaller, and 3,5,7 inferior low-order harmonics are smaller, can add a smaller harmonic compensation current value, i.e., biggish biasing Resistance value.When the motor operation power becomes smaller, real work power is far from rated power, and electric current is smaller at this time, and waveform is not Stablize, 3,5,7 inferior low-order harmonics are bigger, need to increase harmonic compensation current value, namely reduce biased electrical resistance value.To subtract Few low-order harmonic.The specific relationship that adjusts can be obtained by experiment, and details are not described herein.

Optionally, the adjusting of the biased electrical resistance value of the preset supply voltage of the controller 20 and current compensation branch is closed System are as follows: when the supply voltage becomes larger, reduce the biased electrical resistance value of the current compensation branch；When the supply voltage becomes smaller When, increase the biased electrical resistance value of the current compensation branch.

Wherein, the resistance value of the biasing resistor of the current compensation branch and the grade of motor operation power are positively correlated.Power supply When voltage is lower, electric current is larger, and low-order harmonic is smaller, and the harmonic compensation current value of the required current compensation branch also compares It is smaller, increase biased electrical resistance value.When supply voltage becomes larger, electric current reduces, and low-order harmonic increases, so needing to increase the electric current The harmonic compensation current value of branch is compensated, biased electrical resistance value is reduced, to optimize the function of reducing low-order harmonic.It is specific to adjust relationship It can be obtained by experiment, details are not described herein.

In above-described embodiment, corresponding current compensation branch is accessed according to demand, can not only reduce low-order harmonic, moreover it is possible to So that 40 job enlargement of motor, in addition, the utilization rate of supply voltage can also be improved.

Optionally, as shown in figure 4, the PFC control circuit 302 includes that the first chip U1, the first chip U1 includes Biasing resistor input pin IAC and control signal output pin (EN1, EN2, EN3), the biasing resistor input pin of the first chip U1 IAC be the PFC control circuit 302 biasing resistor input terminal, the first chip U1 control signal output pin (EN1, EN2, EN3) be the PFC control circuit 302 control signal output.

Wherein, harmonic compensation current value is accessed motor 40 by the biasing resistor input pin IAC of the first chip U1, to realize Reduce the purpose of harmonic wave according to the size of motor operation power or supply voltage, expands the working range of motor 40 with this. The quantity of the control signal output pin (EN1, EN2, EN3) of the first chip U1 determines by the number of branches of multichannel pfc circuit, One-to-one realization control.In one embodiment, pfc circuit is 3 tunnels, and physical circuit figure refers to Fig. 4.

In above-described embodiment, the model of the first chip U1 can be FAN9673.

In one embodiment, as shown in figure 4, tri- road crisscross parallel of multichannel pfc circuit 303 and 302 Ke Wei of PFC control circuit Pfc circuit, at this point, respectively corresponding pfc circuit all the way there are three the settings of multichannel pfc circuit 303 that PFC control circuit 302 controls (501、502、503)。

Wherein, by wherein all the way for pfc circuit 503, pfc circuit 503 includes first switch Q1, the first inductance L1, the One diode D1, first resistor R1 and first capacitor C1, it is defeated by the biasing resistor of the first chip U1 in harmonic compensation current value After entering the first chip U1 of foot IAC input, as shown in Figure 5, the gain tune of the biasing resistor input pin IAC connection of the first chip U1 Device (with reference to the block diagram of FAN9673 chip as shown in Figure 5) processed then starts to carry out operation, last output current signal passes through again The pin of first chip U1 exports the unlatching and closure for controlling the first switch Q1 in pfc circuit 503, due at this time The harmonic compensation current of the biasing resistor input pin IAC input of one chip U1 is the harmonic compensation electricity generated after via controller control Stream, and, the current signal that current control loop is sent by gain modulator, can by control first switch Q1 unlatching and The electric current of the first inductance of closed pair L1 carries out shaping, corrects the driving power signal of the first inductance L1, wherein first diode D1, first resistor R1 and first capacitor C1 form one-way conduction circuit, so that the current signal of output is direct current signal, into one Step filters out harmonic wave.Wherein, the direction of dotted arrow is all the way signal of the harmonic compensation current value in the first chip U1 in Fig. 5 It flows to and is exported by OPFC1, similarly export the path to the signal flow of OPFC2/OPFC3 referring to dotted arrow.

Optionally, controller 20 can select common various chips to realize, preset determining program and motor operation function The corresponding harmonic compensation current value of rate, supply voltage.

Optionally, driving power circuit 30 can be common three-phase motor driving power circuit 30, driven compressor electricity The band such as source circuit 30, blower driving power circuit 30 carries circuit.

Optionally, the inverter circuit 304 is common various motor inverter circuits 304 in existing life.

It is illustrated in conjunction with Fig. 1,2,3 pairs of the principle of the present invention:

In the first case, controller 20 detects the supply voltage after 301 rectifying and wave-filtering of current rectifying and wave filtering circuit, passes through electricity The size of source voltage come configure current compensation branch access harmonic compensation current value, controller pass through preset current rectifying and wave filtering circuit The mapping relations of the biasing resistor of supply voltage and multiple current compensation branches after 301 rectifying and wave-filterings determine harmonic compensation value. Wherein, when supply voltage is lower, electric current is bigger, and low-order harmonic is smaller, the smaller electric current of access harmonic compensation current value Compensate branch, the i.e. bigger current compensation branch of the biased electrical resistance value of biasing resistor R1.When supply voltage becomes larger, electric current subtracts Small, low-order harmonic increases, the bigger current compensation branch of access harmonic compensation current value, the i.e. biasing resistor of biasing resistor R1 It is worth smaller current compensation branch, to optimize the function of reducing low-order harmonic.

In second situation, controller detects the size of motor operation power, when the motor operation power becomes larger, Real work power is close to rated power, and 3,5,7 inferior low-order harmonics are smaller at this time, can access a harmonic compensation current It is worth the bigger current compensation branch of smaller, biasing resistor R1 biased electrical resistance value.When the motor operation power becomes smaller, Real work power is far from rated power, and 3,5,7 inferior low-order harmonics are bigger at this time, needs to access harmonic compensation current value ratio The smaller current compensation branch of larger, biasing resistor R1 biased electrical resistance value.

In the third situation, controller 20 detects the supply voltage and motor after 301 rectifying and wave-filtering of current rectifying and wave filtering circuit Run power, and the mapping of the biasing resistor by preset supply voltage, motor operation power and multiple current compensation branches Relationship determines harmonic compensation value, determines the current compensation branch of access.

In above-mentioned three kinds of schemes, harmonic wave can be reduced by harmonic compensation, to realize harmonic wave optimization function.This When, the corresponding relationship of specific motor operation watt level, supply voltage size and harmonic wave compensation current passes through actual experiment It is preset with testing, when accessing current compensation branch, it is not limited to one-to-one access, when the harmonic compensation electricity of actual needs access When flow valuve compensates branch without corresponding single current, it can be made by accessing two or more current compensation branch Motor operation watt level, supply voltage size and the harmonic wave compensation current that the harmonic compensation current value of access is more in line with Corresponding relationship realizes accurate configuration, extends the harmonic compensation current value range that can be configured.So that even if excessive in low-order harmonic When, can also there be the access of suitable biasing resistor, reduce different motor operation power and different supply voltages to realize Under low-order harmonic current compensation, thus solve existing filter be easy to appear when harmonic wave quantity is larger overload even burn The problem of ruining.

To achieve the goals above, the present invention also proposes a kind of air conditioner, including air conditioner mainboard and motor control electricity Road, the circuit for controlling motor is set on air conditioner mainboard, and is set to the casing internal.

It is worth noting that, because the air condition of that present invention contains the whole embodiments of above-mentioned circuit for controlling motor, The air condition of that present invention has all beneficial effects of above-mentioned circuit for controlling motor, and details are not described herein again.