CN104953854A - Variable-frequency air conditioner, power circuit of outdoor unit of variable-frequency air conditioner and PFC (power factor correction) control method - Google Patents
Variable-frequency air conditioner, power circuit of outdoor unit of variable-frequency air conditioner and PFC (power factor correction) control method Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims abstract description 171
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- 238000004378 air conditioning Methods 0.000 claims description 47
- 239000000284 extract Substances 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 6
- 230000002194 synthesizing effect Effects 0.000 claims description 6
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a variable-frequency air conditioner, a power circuit of an outdoor unit of the variable-frequency air conditioner and a PFC (power factor correction) control method. The power circuit comprises a rectifying circuit, a PFC circuit, an electrolytic capacitor group, a three-phase inverting circuit, a first voltage sampling unit, a second voltage sampling unit, a current sampling unit and a control unit, wherein the electrolytic capacitor group comprises N electrolytic capacitors connected in parallel and is connected between a positive terminal of a direct-current bus and a negative terminal of the direct-current bus, and N is an integer larger than 2; the first voltage sampling unit is used for sampling voltage Uac input to the PFC circuit; the second voltage sampling unit is used for sampling voltage Udc of the direct-current bus; the current sampling unit is used for sampling current iPFC of the PFC circuit during working; the control unit is used for generating control signals according to the voltage Uac, the voltage Udc and the current iPFC to control the PFC circuit, and reducing ripple voltage borne by the electrolytic capacitor group through closed-loop control on voltage of the direct-current bus. Therefore, ripple current is shared by the N electrolytic capacitors, the ripple current borne by each electrolytic capacitor is reduced, the heat generating amount of each electrolytic capacitor is reduced, the reliability of each electrolytic capacitor is improved, and the service life of each electrolytic capacitor is prolonged.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly the PFC control method of the power circuit of off-premises station in the power circuit of off-premises station, a kind of transducer air conditioning and a kind of transducer air conditioning in a kind of transducer air conditioning.
Background technology
Generally electrochemical capacitor is equipped with in the power circuit of relevant frequency-change air conditioner outdoor machine, and electrochemical capacitor heating in use can affect the performance of electrochemical capacitor and then reduce the reliability of electrochemical capacitor and the useful life shortening electrochemical capacitor, the major reason causing electrochemical capacitor in use to generate heat is the ripple current flowing through electrochemical capacitor self, ripple current is larger, and corresponding electrochemical capacitor temperature rise is also higher.The main power power-supply circuit of frequency-change air conditioner outdoor machine as shown in Figure 1 can contain two big capacity electrolyte capacitors, and D1 '-D4 ' is the full-bridge rectification module of four diode compositions; E11 ', E21 ' are two big capacity electrolyte capacitors, for carrying out filtering to the output voltage of full-bridge rectification module; Q1 '-Q6 ' is six power switch pipe composition three phase inverter bridges, for carrying out inversion to filtered voltage to realize direct current to the conversion exchanged; PMSM ' is compressor electric motor.
In the correlation technique of Fig. 1, in transducer air conditioning actual moving process, the ripple current of electrochemical capacitor E11 ' and E21 ' is flow through in generation by the busbar voltage fluctuation caused by load, each electrochemical capacitor will bear total ripple current of 1/2, the equivalent series resistance effect of the ripple current that each electrochemical capacitor is born and electrochemical capacitor self will produce active power, this active power finally converts heat energy to thus causes electrochemical capacitor internal temperature to rise, affect serviceability and the useful life of electrochemical capacitor, and, along with the increase of load, ripple current increases accordingly, the heat produced by ripple current also increases accordingly, electrochemical capacitor heating is also more serious, this will impact the serviceability of electrochemical capacitor, and then reduce the reliability of electrochemical capacitor and the useful life shortening electrochemical capacitor.
In sum, in correlation technique there are the needs improved in the power circuit of frequency-change air conditioner outdoor machine.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is the power circuit proposing off-premises station in a kind of transducer air conditioning, the caloric value of each electrochemical capacitor of this reduction, improves the reliability of electrochemical capacitor.
Another object of the present invention is to propose a kind of transducer air conditioning.Another object of the present invention is the PFC control method of the power circuit proposing off-premises station in a kind of transducer air conditioning.
For achieving the above object, the power circuit of off-premises station in a kind of transducer air conditioning that one aspect of the present invention embodiment proposes, comprising: convert the alternating current of input to galvanic rectification circuit, the input of described rectification circuit is connected with AC power; Pfc circuit, the input of described pfc circuit is connected with the output of described rectification circuit, and described pfc circuit has the first output and the second output, and described first output is as DC bus positive terminal, and described second output is as DC bus negative pole end; Electrochemical capacitor group, described electrochemical capacitor group is made up of N number of electrochemical capacitor parallel connection, and described electrochemical capacitor group is connected between described DC bus positive terminal and described DC bus negative pole end, wherein, N be greater than 2 integer; Three-phase inverting circuit, described three-phase inverting circuit is connected between described DC bus positive terminal and described DC bus negative pole end, and the three-phase output end of described three-phase inverting circuit is connected with the compressor electric motor in described off-premises station; First voltage sampling unit, described first voltage sampling unit is connected to sample with the input of described pfc circuit and is input to the voltage U of described pfc circuit
ac; Second voltage sampling unit, described second voltage sampling unit is connected with the voltage U of DC bus of sampling with described DC bus negative pole end respectively with described DC bus positive terminal
dc; Current sampling unit, described current sampling unit is connected with described pfc circuit to sample the current i of described pfc circuit when working
pFC; Control unit, described control unit is connected with described pfc circuit with described first voltage sampling unit, described second voltage sampling unit, described current sampling unit respectively, and described control unit is according to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce described electrochemical capacitor group to the voltage of described DC bus.
According to the power circuit of off-premises station in the transducer air conditioning that the embodiment of the present invention proposes, by N number of electrochemical capacitor in parallel between DC bus positive terminal and DC bus negative pole end, thus the ripple current in utilizing N number of electrochemical capacitor to share, reduce the ripple current that each electrochemical capacitor is born, reduce the caloric value of each electrochemical capacitor, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor.In addition, the voltage U of pfc circuit is input to by the first voltage sampling unit sampling
ac, and the voltage U of DC bus of being sampled by the second voltage sampling unit
dc, and by current i during current sampling unit sampling pfc circuit work
pFC, control unit is according to voltage U
ac, voltage U
dcgenerate control signal with current i PFC to control pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce electrochemical capacitor group to the voltage of DC bus, thus by pfc circuit, closed-loop control is carried out to the voltage of DC bus, the fluctuation of DC bus-bar voltage is limited within preset range, and then effectively can reduce the ripple voltage that electrochemical capacitor group bears, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, and then reduce the cost of transducer air conditioning.
According to one embodiment of present invention, described control unit specifically comprises: voltage error calculator, and described voltage error calculator is connected with described second voltage sampling unit, and described voltage error calculator calculates described voltage U
dcwith voltage given U
* dcbetween voltage error value; Voltage regulator, described voltage regulator is connected with described voltage error calculator, and described voltage regulator regulates to export PFC current-order amplitude i to described voltage error value
* pFCM; Synthesizer, described synthesizer is connected with described first voltage sampling unit with described voltage regulator respectively, and described synthesizer extracts described voltage U
acphase place, and by described voltage U
acphase place and described PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC; Current error calculator, described current error calculator is connected with described synthesizer with described current sampling unit respectively, and described current error calculator calculates described current i
pFCwith described PFC current-order i
* pFCbetween current error value; Current regulator, described current regulator is connected with described current error calculator, and described current regulator regulates with output regulation signal to described current error value; Pulse generator, described pulse generator is connected with described pfc circuit with described current regulator respectively, and described pulse generator generates pwm signal to control opening or turning off of switching tube in described pfc circuit according to described conditioning signal.
According to one embodiment of present invention, the capacity of each electrochemical capacitor in described N number of electrochemical capacitor is less than or equal to preset capacity.
According to one embodiment of present invention, N is the integer of 8 ~ 15.
According to one embodiment of present invention, described compressor electric motor is permagnetic synchronous motor.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of transducer air conditioning, comprises the power circuit of off-premises station in described transducer air conditioning.
According to the transducer air conditioning that the embodiment of the present invention proposes, by the power circuit of above-described embodiment, the caloric value of each electrochemical capacitor in circuit capable of reducing power source, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, reduce the production cost of transducer air conditioning.
For achieving the above object, another aspect of the invention embodiment proposes the PFC control method of the power circuit of off-premises station in a kind of transducer air conditioning, the power circuit of described off-premises station comprises and converts the alternating current of input to galvanic rectification circuit, pfc circuit, electrochemical capacitor group and three-phase inverting circuit, the input of described pfc circuit is connected with the output of described rectification circuit, described pfc circuit has the first output and the second output, described first output is as DC bus positive terminal, described second output is as DC bus negative pole end, described electrochemical capacitor group is made up of N number of electrochemical capacitor parallel connection, described electrochemical capacitor group is connected between described DC bus positive terminal and described DC bus negative pole end, wherein, N be greater than 2 integer, described PFC control method comprises the following steps: sampling is input to the voltage U of described pfc circuit
ac, and the voltage U of DC bus of sampling
dc, current i during described pfc circuit of sampling work
pFC, according to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, and by controlling described pfc circuit to carry out closed-loop control to the voltage of described DC bus, to reduce the ripple voltage that described electrochemical capacitor group is born.
According to the PFC control method of the power circuit of off-premises station in the transducer air conditioning that the embodiment of the present invention proposes, sampling is input to the voltage U of pfc circuit
ac, and the voltage U of DC bus of sampling
dc, and the current i during work of sampling pfc circuit
pFC, then, according to voltage U
ac, voltage U
dcgenerate control signal with current i PFC to control pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce electrochemical capacitor group to the voltage of DC bus, thus by pfc circuit, closed-loop control is carried out to the voltage of DC bus, the fluctuation of DC bus-bar voltage is limited within preset range, and then effectively can reduce the ripple voltage that electrochemical capacitor group bears, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, and then reduce the cost of transducer air conditioning.In addition, by N number of electrochemical capacitor in parallel between DC bus positive terminal and DC bus negative pole end, thus the ripple current in utilizing N number of electrochemical capacitor to share, reduce the ripple current that each electrochemical capacitor is born, reduce the caloric value of each electrochemical capacitor, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor.
According to one embodiment of present invention, according to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, specifically comprise: calculate described voltage U
dcwith voltage given U
* dcbetween voltage error value, and regulate to export PFC current-order amplitude i to described voltage error value
* pFCM; Extract described voltage U
acphase place, and by described voltage U
acphase place and described PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC; Calculator calculates described current i
pFCwith described PFC current-order i
* pFCbetween current error value, and regulate with output regulation signal to described current error value; Pwm signal is generated to control opening or turning off of switching tube in described pfc circuit according to described conditioning signal.
According to one embodiment of present invention, the capacity of each electrochemical capacitor in described N number of electrochemical capacitor is less than or equal to preset capacity.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the power circuit of off-premises station in correlation technique;
Fig. 2 is the circuit diagram of the power circuit of off-premises station in the transducer air conditioning according to the embodiment of the present invention;
Fig. 3 is the control principle schematic diagram controlled pfc circuit according to the control unit of the present invention's specific embodiment;
Fig. 4 is the flow chart of the PFC control method of the power circuit of off-premises station in the transducer air conditioning according to the embodiment of the present invention; And
Fig. 5 is the flow chart of the PFC control method of the power circuit of off-premises station in the transducer air conditioning according to the present invention's specific embodiment.
Reference numeral:
Rectification circuit 10, pfc circuit 20, electrochemical capacitor group 30, three-phase inverting circuit 40, first voltage sampling unit 50, second voltage sampling unit 60, current sampling unit 70, control unit 80, voltage error calculator 81, voltage regulator 82, synthesizer 83, current error calculator 84, current regulator 85 and pulse generator 86.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings the PFC control method of the power circuit of off-premises station in the power circuit of off-premises station in the transducer air conditioning of embodiment of the present invention proposition, the transducer air conditioning with this power circuit and transducer air conditioning is described.According to an example of the present invention, the power circuit of off-premises station can be the main power power-supply filter circuit of high pressure.
Fig. 2 is the circuit diagram of the power circuit of off-premises station in the transducer air conditioning according to the embodiment of the present invention.As shown in Figure 2, in this transducer air conditioning, the power circuit of off-premises station comprises: rectification circuit 10, PFC (Power Factor Correction, power factor correction) circuit 20, electrochemical capacitor group 30, three-phase inverting circuit 40, first voltage sampling unit 50, second voltage sampling unit 60, current sampling unit 70 and control unit 80.
Wherein, rectification circuit 10 converts the alternating current of input to direct current, and the input of rectification circuit 10 is connected with AC power AC such as 220V electric main; The input of pfc circuit 20 is connected with the output of rectification circuit 10, and pfc circuit 20 has the first output and the second output, and the first output is as DC bus positive terminal, and the second output is as DC bus negative pole end; Three-phase inverting circuit 40 is connected between DC bus positive terminal and DC bus negative pole end, and the three-phase output end of three-phase inverting circuit 40 is connected with the compressor electric motor PMSM in off-premises station.According to a concrete example of the present invention, compressor electric motor PMSM can be permagnetic synchronous motor.
As shown in Figure 2, rectification circuit 10 can comprise the rectifier bridge of D1-D4 tetra-diode compositions, and three-phase inverting circuit 40 can comprise Q1-Q6 six power switch pipe composition three phase inverter bridges.Should be understood that, the operation principle of rectifier bridge and three phase inverter bridge, to be specifically connected etc. be prior art all, and be well known to those skilled in the art, and here for succinct object, repeats no longer one by one.
Electrochemical capacitor group 30 is made up of N number of electrochemical capacitor E1-EN parallel connection, and electrochemical capacitor group 30 is connected between DC bus positive terminal and DC bus negative pole end.That is, each electrochemical capacitor is connected between DC bus positive terminal and DC bus negative pole end, namely says, the positive pole of the 1st electrochemical capacitor E1 is connected with DC bus positive terminal, and the negative pole of the 1st electrochemical capacitor E1 is connected with DC bus negative pole end; The positive pole of the 2nd electrochemical capacitor E2 is connected with DC bus positive terminal, and the negative pole of the 2nd electrochemical capacitor E2 is connected with DC bus negative pole end; The positive pole of N number of electrochemical capacitor EN is connected with DC bus positive terminal, and the negative pole of N number of electrochemical capacitor EN is connected with DC bus negative pole end, wherein, N be greater than 2 integer.
First voltage sampling unit 50 is connected to sample with the input of pfc circuit 20 and is input to the voltage U of pfc circuit 20
ac; Second voltage sampling unit 60 is connected with DC bus positive terminal and DC bus negative pole end respectively with the voltage U of DC bus of sampling
dc; The current i that current sampling unit 70 is connected when working with pfc circuit of sampling with pfc circuit 20
pFC; Control unit 80 is connected with pfc circuit 20 with the first voltage sampling unit 50, second voltage sampling unit 60, current sampling unit 70 respectively, and control unit 80 is according to voltage U
ac, voltage U
dcand current i
pFCgenerate control signal to control pfc circuit 20, with by carrying out the ripple voltage that closed-loop control is born to reduce electrochemical capacitor group 30 to the voltage of DC bus.
As shown in Figure 2, pfc circuit 20 can comprise inductance L 1, switching tube S1 and diode D5.Wherein, rectification circuit 10 has the first output and the second output, and one end of inductance L 1 is connected with the first output of rectification circuit 10; The anode of diode D5 is connected with the other end of inductance L 1, and the anode of diode D5 is as the first output of pfc circuit 20; The collector electrode of switching tube S1 is connected with the other end of inductance L 1, as the second output of pfc circuit 20 after the emitter of switching tube S1 is connected with the second output of rectification circuit 10, the grid of switching tube S1 is connected with control unit 80, and switching tube S1 can open or turn off under the driving of control unit 80.Particularly, control unit 80 can generate pwm signal according to voltage U ac, voltage U dc and current i PFC, and export the grid of pwm control signal to switching tube S1 with driving switch pipe S1, like this, control unit 80 is by just controlling the voltage U dc of DC bus to the control of pfc circuit 20 breaker in middle pipe S1, and then the ripple voltage that control is applied in electrochemical capacitor group 30.
As mentioned above, the embodiment of the present invention adopts 2 electrochemical capacitor E11 ' and E21 ' in N number of electrochemical capacitor E1-EN replacement correlation technique, like this, the total ripple current flowing through electrochemical capacitor group 30 is shared by N number of electrochemical capacitor E1-EN, the ripple current born of each electrochemical capacitor only for total ripple current 1/N (N be greater than 2 integer), with electrochemical capacitor each in Fig. 1 need bear total ripple current 1/2 compared with, the ripple current that in the power circuit of the embodiment of the present invention, each electrochemical capacitor is born significantly reduces, thus the heating of reduction electrochemical capacitor can be reached, improve electrochemical capacitor reliability and the object increased the service life.
Further, the control unit 80 of the power circuit of the embodiment of the present invention also controls the voltage U dc of DC bus by controlling pfc circuit 20, the fluctuation of DC bus-bar voltage Udc to be limited within prescribed limit, and then effectively reduce the ripple voltage that electrochemical capacitor group 30 bears.And, controlled by the voltage U dc of pfc circuit 20 pairs of DC buss, also can reduce the total capacity of N number of electrochemical capacitor E1-EN, and have substantial connection with capacity due to the cost of electrochemical capacitor, the larger cost of capacity is higher, therefore the total capacity reducing electrochemical capacitor group on the basis of quality ensureing DC bus-bar voltage can reduce the cost of electrochemical capacitor, reduces the cost of transducer air conditioning.
According to one embodiment of present invention, the capacity of each electrochemical capacitor in N number of electrochemical capacitor E1-EN is less than or equal to preset capacity, thus ensures that N number of electrochemical capacitor E1-EN is the electrochemical capacitor of low capacity.In other words, the embodiment of the present invention adopts the electrochemical capacitor of multiple low capacity to replace jumbo electrochemical capacitor in correlation technique.
According to one embodiment of present invention, N can be the integer of 8 ~ 15.It should be noted that, the concrete numerical value of N can set according to actual conditions, and on the basis that the quality of guarantee DC bus-bar voltage and ripple voltage be not more than setting, suitably can reduce the number of N.
According to a preferred embodiment of the present invention, on the basis of quality ensureing DC bus-bar voltage, N can be 10, and the capacity of each electrochemical capacitor in 10 electrochemical capacitors all can be 47UF.Specifically, the power circuit of the embodiment of the present invention adopts the low capacity electrochemical capacitor of 10 47UF to replace the big capacity electrolyte capacitor of two 470UF in Fig. 1, like this, the total ripple current flowing through electrochemical capacitor group 30 is shared by 10 low capacity electrochemical capacitors, the ripple current that each electrochemical capacitor is born is only 1/10 of total ripple current, the ripple current that each electrochemical capacitor is born significantly reduces, thus can improve the heating problem of electrochemical capacitor.In addition, in the correlation technique of Fig. 1, the total capacity of electrochemical capacitor is 940UF (i.e. two 470UF), and the total capacity adopting 10 47UF electrochemical capacitors in the embodiment of the present invention is 470UF, the capacity of electrochemical capacitor group 30 is the half of correlation technique, thus also significantly can reduce the cost of electrochemical capacitor.
Below the loop control theory of PFC control method is described in detail.
Particularly, as shown in Figure 3, control unit 80 specifically comprises: voltage error calculator 81, voltage regulator 82, synthesizer 83, current error calculator 84, current regulator 85 and pulse generator 86.
Wherein, voltage error calculator 81 is connected with the second voltage sampling unit 60, voltage error calculator 81 calculating voltage U
dcwith voltage given U
* dcbetween voltage error value; Voltage regulator 82 is connected with voltage error calculator 81, and voltage regulator 82 pairs of voltage error value regulate to export PFC current-order amplitude i
* pFCM; Synthesizer 83 is connected with the first voltage sampling unit 50 with voltage regulator 82 respectively, and synthesizer 83 extracts voltage U
acphase place, and by voltage U
acphase place and PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC; Current error calculator 84 is connected with synthesizer 83 with current sampling unit 70 respectively, current error calculator 84 calculating current i
pFCwith PFC current-order i
* pFCbetween current error value; Current regulator 85 is connected with current error calculator 84, and current regulator 85 pairs of current error values regulate with output regulation signal; Pulse generator 86 is connected with pfc circuit 20 with current regulator 85 respectively, and pulse generator 86 generates pwm signal to control opening or turning off of switching tube S1 in pfc circuit 20 according to conditioning signal.
As mentioned above, in the power circuit course of work, voltage error calculator 81 is sampled by the second voltage sampling unit 60 voltage U of DC bus
dc, and by voltage given U
* dcwith the voltage U of DC bus
dccompare to obtain voltage error value U
* dc-U
dc.Afterwards, this voltage error value U
* dc-U
dcpFC current-order amplitude i will be exported after being regulated by voltage regulator 82
* pFCM, synthesizer 83 is input to the voltage U of pfc circuit 20 by the first voltage sampling unit 50 sampling simultaneously
ac, and extract voltage U
acphase place U
ac/ U
acM, and by voltage U
acphase place U
ac/ U
acMwith PFC current-order amplitude i
* pFCMsynthesis PFC current-order i
* pFC.Afterwards, current error calculator 84 by current sampling unit 70 sample pfc circuit work time current i
pFC, and by PFC current-order i
* pFCcurrent i when working with pfc circuit
pFCcompare to obtain current error value i
* pFC-i
pFC.Afterwards, this current error value i
* pFC-i
pFCafter current regulator 65 regulates, export pulse generator 86 to, pulse generator 86 can generate the pwm signal of driving switch pipe S1.
Thus, the object of the ripple voltage controlling DC bus-bar voltage and then control electrochemical capacitor just can be reached by the control of above-described embodiment.
In sum, according to the power circuit of off-premises station in the transducer air conditioning that the embodiment of the present invention proposes, by N number of electrochemical capacitor in parallel between DC bus positive terminal and DC bus negative pole end, thus the ripple current in utilizing N number of electrochemical capacitor to share, reduce the ripple current that each electrochemical capacitor is born, reduce the caloric value of each electrochemical capacitor, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor.In addition, the voltage U of pfc circuit is input to by the first voltage sampling unit sampling
ac, and the voltage U of DC bus of being sampled by the second voltage sampling unit
dc, and by current i during current sampling unit sampling pfc circuit work
pFC, control unit is according to voltage U
ac, voltage U
dcgenerate control signal with current i PFC to control pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce electrochemical capacitor group to the voltage of DC bus, thus by pfc circuit, closed-loop control is carried out to the voltage of DC bus, the fluctuation of DC bus-bar voltage is limited within preset range, and then effectively can reduce the ripple voltage that electrochemical capacitor group bears, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, and then reduce the cost of transducer air conditioning.
In addition, the embodiment of the present invention also proposed a kind of transducer air conditioning, comprises the power circuit of off-premises station in the transducer air conditioning of above-described embodiment.
According to the transducer air conditioning that the embodiment of the present invention proposes, by the power circuit of above-described embodiment, the caloric value of each electrochemical capacitor in circuit capable of reducing power source, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, reduce the production cost of transducer air conditioning.
Based on above-described embodiment, the embodiment of the present invention also proposed the PFC control method of the power circuit of off-premises station in a kind of transducer air conditioning.
Fig. 4 is the flow chart of the PFC control method of the power circuit of off-premises station in the transducer air conditioning according to the embodiment of the present invention.The power circuit of off-premises station comprises and converts the alternating current of input to galvanic rectification circuit, pfc circuit, electrochemical capacitor group and three-phase inverting circuit, the input of pfc circuit is connected with the output of rectification circuit, pfc circuit has the first output and the second output, first output is as DC bus positive terminal, second output is as DC bus negative pole end, electrochemical capacitor group is made up of N number of electrochemical capacitor parallel connection, electrochemical capacitor group is connected between DC bus positive terminal and DC bus negative pole end, wherein, N be greater than 2 integer.
According to one embodiment of present invention, the capacity of each electrochemical capacitor in N number of electrochemical capacitor is less than or equal to preset capacity, thus ensures that N number of electrochemical capacitor E1-EN is the electrochemical capacitor of low capacity.In other words, the embodiment of the present invention adopts the electrochemical capacitor of multiple low capacity to replace jumbo electrochemical capacitor in correlation technique.
As described in Figure 4, PFC control method comprises the following steps:
S1: sampling is input to the voltage U of pfc circuit
ac, and the voltage U of DC bus of sampling
dc.
S2: the current i during work of sampling pfc circuit
pFC.
S3: according to voltage U
ac, voltage U
dcand current i
pFCgenerate control signal to control pfc circuit, and by controlling pfc circuit to carry out closed-loop control to the voltage of DC bus, to reduce the ripple voltage that electrochemical capacitor group is born.
According to a specific embodiment of the present invention, as shown in Figure 5, according to voltage U
ac, voltage U
dcand current i
pFCgenerate control signal to carry out control to pfc circuit and step S3 specifically comprises:
S31: calculating voltage U
dcwith voltage given U
* dcbetween voltage error value, and regulate to export PFC current-order amplitude i to voltage error value
* pFCM.
S32: extract voltage U
acphase place, and by voltage U
acphase place and PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC.
S33: calculating current i
pFCwith PFC current-order i
* pFCbetween current error value, and current error value to be regulated with output regulation signal.
S34: generate pwm signal to control opening or turning off of switching tube in pfc circuit according to conditioning signal.
Thus, just can be reached the object of the ripple voltage controlling DC bus-bar voltage and then control electrochemical capacitor by the control of above-described embodiment, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, and then reduce the cost of transducer air conditioning.
In addition, should be understood that, the concrete structure of the power circuit of off-premises station and the loop control theory of PFC control method are described in detail in the embodiment of Fig. 2 and Fig. 3, are in succinct object here, repeat no more.
In sum, according to the PFC control method of the power circuit of off-premises station in the transducer air conditioning that the embodiment of the present invention proposes, sampling is input to the voltage U of pfc circuit
ac, and the voltage U of DC bus of sampling
dc, and the current i during work of sampling pfc circuit
pFC, then, according to voltage U
ac, voltage U
dcgenerate control signal with current i PFC to control pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce electrochemical capacitor group to the voltage of DC bus, thus by pfc circuit, closed-loop control is carried out to the voltage of DC bus, the fluctuation of DC bus-bar voltage is limited within preset range, and then effectively can reduce the ripple voltage that electrochemical capacitor group bears, and the total capacity of electrochemical capacitor can be reduced, reduce the cost of electrochemical capacitor, and then reduce the cost of transducer air conditioning.In addition, by N number of electrochemical capacitor in parallel between DC bus positive terminal and DC bus negative pole end, thus the ripple current in utilizing N number of electrochemical capacitor to share, reduce the ripple current that each electrochemical capacitor is born, reduce the caloric value of each electrochemical capacitor, improve the reliability of electrochemical capacitor, extend the useful life of electrochemical capacitor.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (9)
1. the power circuit of off-premises station in transducer air conditioning, is characterized in that, comprising:
Convert the alternating current of input to galvanic rectification circuit, the input of described rectification circuit is connected with AC power;
Pfc circuit, the input of described pfc circuit is connected with the output of described rectification circuit, and described pfc circuit has the first output and the second output, and described first output is as DC bus positive terminal, and described second output is as DC bus negative pole end;
Electrochemical capacitor group, described electrochemical capacitor group is made up of N number of electrochemical capacitor parallel connection, and described electrochemical capacitor group is connected between described DC bus positive terminal and described DC bus negative pole end, wherein, N be greater than 2 integer;
Three-phase inverting circuit, described three-phase inverting circuit is connected between described DC bus positive terminal and described DC bus negative pole end, and the three-phase output end of described three-phase inverting circuit is connected with the compressor electric motor in described off-premises station;
First voltage sampling unit, described first voltage sampling unit is connected to sample with the input of described pfc circuit and is input to the voltage U of described pfc circuit
ac;
Second voltage sampling unit, described second voltage sampling unit is connected with the voltage U of DC bus of sampling with described DC bus negative pole end respectively with described DC bus positive terminal
dc;
Current sampling unit, described current sampling unit is connected with described pfc circuit to sample the current i of described pfc circuit when working
pFC;
Control unit, described control unit is connected with described pfc circuit with described first voltage sampling unit, described second voltage sampling unit, described current sampling unit respectively, and described control unit is according to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, with by carrying out the ripple voltage that closed-loop control is born to reduce described electrochemical capacitor group to the voltage of described DC bus.
2. the power circuit of off-premises station in transducer air conditioning as claimed in claim 1, it is characterized in that, described control unit specifically comprises:
Voltage error calculator, described voltage error calculator is connected with described second voltage sampling unit, and described voltage error calculator calculates described voltage U
dcwith voltage given U
* dcbetween voltage error value;
Voltage regulator, described voltage regulator is connected with described voltage error calculator, and described voltage regulator regulates to export PFC current-order amplitude i to described voltage error value
* pFCM;
Synthesizer, described synthesizer is connected with described first voltage sampling unit with described voltage regulator respectively, and described synthesizer extracts described voltage U
acphase place, and by described voltage U
acphase place and described PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC;
Current error calculator, described current error calculator is connected with described synthesizer with described current sampling unit respectively, and described current error calculator calculates described current i
pFCwith described PFC current-order i
* pFCbetween current error value;
Current regulator, described current regulator is connected with described current error calculator, and described current regulator regulates with output regulation signal to described current error value;
Pulse generator, described pulse generator is connected with described pfc circuit with described current regulator respectively, and described pulse generator generates pwm signal to control opening or turning off of switching tube in described pfc circuit according to described conditioning signal.
3. the power circuit of off-premises station in transducer air conditioning as claimed in claim 1 or 2, it is characterized in that, the capacity of each electrochemical capacitor in described N number of electrochemical capacitor is less than or equal to preset capacity.
4. the power circuit of off-premises station in transducer air conditioning as claimed in claim 1, it is characterized in that, N is the integer of 8 ~ 15.
5. the power circuit of off-premises station in transducer air conditioning as claimed in claim 1, it is characterized in that, described compressor electric motor is permagnetic synchronous motor.
6. a transducer air conditioning, is characterized in that, comprises the power circuit of off-premises station in the transducer air conditioning according to any one of claim 1-5.
7. the PFC control method of the power circuit of off-premises station in a transducer air conditioning, it is characterized in that, the power circuit of described off-premises station comprises and converts the alternating current of input to galvanic rectification circuit, pfc circuit, electrochemical capacitor group and three-phase inverting circuit, the input of described pfc circuit is connected with the output of described rectification circuit, described pfc circuit has the first output and the second output, described first output is as DC bus positive terminal, described second output is as DC bus negative pole end, described electrochemical capacitor group is made up of N number of electrochemical capacitor parallel connection, described electrochemical capacitor group is connected between described DC bus positive terminal and described DC bus negative pole end, wherein, N be greater than 2 integer, described PFC control method comprises the following steps:
Sampling is input to the voltage U of described pfc circuit
ac, and the voltage U of DC bus of sampling
dc;
Current i during described pfc circuit of sampling work
pFC;
According to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, and by controlling described pfc circuit to carry out closed-loop control to the voltage of described DC bus, to reduce the ripple voltage that described electrochemical capacitor group is born.
8. PFC control method as claimed in claim 7, is characterized in that, according to described voltage U
ac, described voltage U
dcwith described current i
pFCgenerate control signal to control described pfc circuit, specifically comprise:
Calculate described voltage U
dcwith voltage given U
* dcbetween voltage error value, and regulate to export PFC current-order amplitude i to described voltage error value
* pFCM;
Extract described voltage U
acphase place, and by described voltage U
acphase place and described PFC current-order amplitude i
* pFCMcarry out synthesizing to generate PFC current-order i
* pFC;
Calculator calculates described current i
pFCwith described PFC current-order i
* pFCbetween current error value, and regulate with output regulation signal to described current error value;
Pwm signal is generated to control opening or turning off of switching tube in described pfc circuit according to described conditioning signal.
9. PFC control method as claimed in claim 7 or 8, it is characterized in that, the capacity of each electrochemical capacitor in described N number of electrochemical capacitor is less than or equal to preset capacity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510349392.7A CN104953854A (en) | 2015-06-19 | 2015-06-19 | Variable-frequency air conditioner, power circuit of outdoor unit of variable-frequency air conditioner and PFC (power factor correction) control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510349392.7A CN104953854A (en) | 2015-06-19 | 2015-06-19 | Variable-frequency air conditioner, power circuit of outdoor unit of variable-frequency air conditioner and PFC (power factor correction) control method |
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|---|---|
| CN104953854A true CN104953854A (en) | 2015-09-30 |
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|---|---|---|---|
| CN201510349392.7A Pending CN104953854A (en) | 2015-06-19 | 2015-06-19 | Variable-frequency air conditioner, power circuit of outdoor unit of variable-frequency air conditioner and PFC (power factor correction) control method |
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| CN107681939A (en) * | 2017-10-30 | 2018-02-09 | 广东美的制冷设备有限公司 | Electric machine control system, transducer air conditioning |
| CN107990505A (en) * | 2017-12-21 | 2018-05-04 | 广东美的暖通设备有限公司 | Frequency conversion control circuit and air conditioner |
| CN108054913A (en) * | 2018-01-29 | 2018-05-18 | 广东美的制冷设备有限公司 | Pfc circuit, electric machine control system and transducer air conditioning |
| CN108123593A (en) * | 2018-01-29 | 2018-06-05 | 广东美的制冷设备有限公司 | Pfc circuit, electric machine control system and transducer air conditioning |
| CN109708277A (en) * | 2018-12-29 | 2019-05-03 | 广东美的制冷设备有限公司 | Progress control method, system, air conditioner and computer readable storage medium |
| CN110632367A (en) * | 2019-09-29 | 2019-12-31 | 广东美的暖通设备有限公司 | Detection method, detection device, frequency converter, frequency conversion system and storage medium |
| CN110995017A (en) * | 2019-12-27 | 2020-04-10 | 散裂中子源科学中心 | High-voltage resonant network energy fluctuation control circuit and control method |
| CN113394752A (en) * | 2021-06-16 | 2021-09-14 | Tcl空调器(中山)有限公司 | Capacitor bus voltage control method, device, equipment and computer storage medium |
| CN114322228A (en) * | 2022-01-05 | 2022-04-12 | 青岛海信日立空调系统有限公司 | Air conditioner |
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| CN110995017A (en) * | 2019-12-27 | 2020-04-10 | 散裂中子源科学中心 | High-voltage resonant network energy fluctuation control circuit and control method |
| CN113394752B (en) * | 2021-06-16 | 2023-02-17 | Tcl空调器(中山)有限公司 | Capacitor bus voltage control method, device, equipment and computer storage medium |
| CN113394752A (en) * | 2021-06-16 | 2021-09-14 | Tcl空调器(中山)有限公司 | Capacitor bus voltage control method, device, equipment and computer storage medium |
| CN114322228A (en) * | 2022-01-05 | 2022-04-12 | 青岛海信日立空调系统有限公司 | Air conditioner |
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