CN108075670A - For the power supply change-over device and its control method of transducer air conditioning - Google Patents
For the power supply change-over device and its control method of transducer air conditioning Download PDFInfo
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- CN108075670A CN108075670A CN201611023793.4A CN201611023793A CN108075670A CN 108075670 A CN108075670 A CN 108075670A CN 201611023793 A CN201611023793 A CN 201611023793A CN 108075670 A CN108075670 A CN 108075670A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
Abstract
The present invention provides a kind of power supply change-over device for transducer air conditioning, including：Rectification circuit, for controllably carrying out rectification to three-phase alternating-current supply；AC current collecting circuit, for gathering the input current signal of three-phase alternating-current supply；AC voltage sampling circuit, for gathering input voltage signal in three-phase alternating-current supply；DC voltage Acquisition Circuit, for gathering the output voltage signal after rectified circuit rectifies；Digital signal processor, for calculating the input current value of three-phase alternating-current supply, input voltage value and the output voltage values of rectification circuit, and carry out Real-time Feedback calculating, to provide control signal to rectification circuit according to feedback result of calculation, so that the output voltage stabilization of rectification circuit is in reference voltage level and the input current phase of three-phase alternating-current supply is caused to follow the input voltage phase of three-phase alternating-current supply.The solution of the present invention power factor is high, and harmonic content is small, reduces the complexity and sampling error of circuit.
Description
Technical field
The present invention relates to transducer air conditioning control, more particularly to the power supply change-over device for transducer air conditioning and its control
Method processed.
Background technology
In transducer air conditioning, generally by handing over orthogonal power conversion, drive is provided to frequency-changeable compressor by commutation inversion
Dynamic signal, during power conversion, is present with phase difference, power quality is caused to decline between electric current and voltage, and meeting
It generates and exchanges power loss.
For this problem, occur PFC (Power Factor Correction, letter in the prior art
Claim PFC) technology.PFC technologies are generally divided into passive PFC and active PFC.Wherein current transducer air conditioning manufacturer generally uses
Be passive PFC, technical way be R, S, T three phase mains it is each mutually simultaneously, series connection special parameter lc circuit (capacitor with
The combination of inductor), force current phase offset so that current phase follows voltage-phase, improves power factor.
The shortcomings that passive PFC, is big for inductance volume, and parameter needs to change with load, once it is determined that, it is difficult to it modifies, portion
The harmonic wave of gradation number is more difficult to be passed through.Also there are a large amount of harmonic waves for current waveform.The busbar voltage of rectification output cannot raise and voltage stabilizing,
And freeze with air conditioner, heat isotype variation, it loads non-linear, discretization and fluctuates larger.
The power factor of active PFC can reach 0.999 or higher, THDi (Total Harmonic Current
Distortion, total harmonic current virtual value) 5% can be less than, each harmonic can meet national standard, and expand compressor
Torque range, that is, increase the carrying load ability of air conditioner, but since active PFC technical difficulty is big, signal processing is multiple
Miscellaneous of high cost, seldom air-conditioning producer uses the technology at present.
The content of the invention
It is small it is an object of the present invention to provide a kind of current harmonics, output voltage stabilization for transducer air conditioning
Power supply change-over device and its control method.
The present invention one is further objective is that will reduce the complexity of power supply change-over device signal processing.
Particularly, the present invention provides a kind of power supply change-over device for transducer air conditioning, including：AC power is defeated
Enter circuit, for connecting external three-phase alternating-current supply；Rectification circuit is connected with AC power input circuit, for controllably
Rectification is carried out to three-phase alternating-current supply；AC current collecting circuit, for gathering the input current signal of three-phase alternating-current supply；It hands over
Voltage collection circuit is flowed, for gathering input voltage signal in three-phase alternating-current supply；DC voltage Acquisition Circuit passes through for gathering
Output voltage signal after rectifier circuit rectifies；Digital signal processor, for respectively according to input current signal, input voltage
The defeated of the input current value of three-phase alternating-current supply, input voltage value and rectification circuit is calculated in signal, output voltage signal
Go out voltage value, and Real-time Feedback meter is carried out using reference voltage level and input current value, input voltage value, output voltage values
It calculates, to provide control signal to rectification circuit according to feedback result of calculation so that the output voltage stabilization of rectification circuit is in reference
Voltage value and the input current phase of three-phase alternating-current supply is caused to follow the input voltage phase of three-phase alternating-current supply, wherein
Reference voltage is preset Output Voltage in Rectified Circuits desired value；And inverter circuit, the direct current that rectification circuit is exported
Electric inversion is the driving power of the compressor of driving transducer air conditioning.
Optionally, ac current measurement circuit includes：It is serially connected with the electric current of two-phase in the supply line of three-phase alternating-current supply
Sensor and two groups of signal followers being connected respectively with current sensor；Alternating current voltage measuring circuit includes：It is respectively used to
Two groups of signal amplifiers that two groups of line voltages of three-phase alternating-current supply are handled；Digital signal processor, with two groups of signals
The output terminal of follower and two groups of signal amplifiers connects respectively, and is configured to be believed according to the biphase current of three-phase alternating-current supply
The three-phase input current value of three-phase alternating-current supply number is calculated, three are calculated according to the two of three-phase alternating-current supply groups of line voltages
The three-phase input voltage value of cross streams power supply.
Optionally, digital signal processor is configured to：Carry out the first proportional integral derivative adjusting and corresponding first
Signal converts, so that the output voltage stabilization of rectification circuit is in reference voltage level and obtains three-phase current setting value, the first ratio
Example integral calculus is adjusted using output voltage signal as feedback signal, and reference voltage level is as echo signal；Carry out second
Proportional integral derivative adjusts and corresponding secondary signal conversion so that the input current phase of three-phase alternating-current supply follows three-phase
The input voltage phase of AC power simultaneously obtains three-phase voltage setting value, and the second proportional integral derivative is adjusted with input current signal
As feedback signal, and three-phase current setting value is as echo signal.
Optionally, rectification circuit is three phase full bridge PWM rectification circuits；And digital signal processor is configured to basis
The make-and-break time and duty cycle of each bridge arm of three-phase voltage preset value calculation three phase full bridge PWM rectification circuits, and according to make-and-break time
With duty cycle corresponding control signal is provided to the switching device of each bridge arm.
Optionally, above-mentioned power supply change-over device further includes：Three-phase reactor is serially connected with the supply line of three-phase alternating-current supply
In；And bus capacitor, it is parallel to the output terminal of rectification circuit.
According to another aspect of the present invention, a kind of control of the power supply change-over device for transducer air conditioning is additionally provided
Method, wherein power supply change-over device include：AC power input circuit, for connecting external three-phase alternating-current supply；Rectified current
Road is connected with the AC power input circuit, for controllably carrying out rectification to three-phase alternating-current supply；AC current collecting electricity
Road, for gathering the input current signal of three-phase alternating-current supply；AC voltage sampling circuit, for gathering in three-phase alternating-current supply
Input voltage signal；DC voltage Acquisition Circuit, for gathering the output voltage signal after rectified circuit rectifies；Inversion electricity
The DC inverter of rectification circuit output is the driving power of the compressor of driving transducer air conditioning by road, and control method
Including：The input of three-phase alternating-current supply is calculated according to input current signal, input voltage signal, output voltage signal respectively
The output voltage values of current value, input voltage value and rectification circuit；Utilize reference voltage level and input current value, input electricity
Pressure value, output voltage values carry out Real-time Feedback calculating, and reference voltage is preset Output Voltage in Rectified Circuits desired value；Root
There is provided control signal to rectification circuit according to feedback result of calculation so that the output voltage stabilization of rectification circuit in reference voltage level,
And the input current phase of three-phase alternating-current supply is caused to follow the input voltage phase of three-phase alternating-current supply.
Optionally, carrying out the step of Real-time Feedback calculating includes：Carry out the first proportional integral derivative adjusting and corresponding
First signal converts, so that the output voltage stabilization of rectification circuit is in reference voltage level and obtains three-phase current setting value, the
One proportional integral derivative is adjusted using output voltage signal as feedback signal, and reference voltage level is as echo signal；It carries out
Second proportional integral derivative adjusts and corresponding secondary signal conversion so that the input current phase of three-phase alternating-current supply follows
The input voltage phase of three-phase alternating-current supply simultaneously obtains three-phase voltage setting value, and the second proportional integral derivative is adjusted with input current
Signal is as feedback signal, and three-phase current setting value is as echo signal.
Optionally, rectification circuit is three phase full bridge PWM rectification circuits；And it is carried according to feedback result of calculation to rectification circuit
It is further included for the step of control signal：According to the break-make of each bridge arm of three-phase voltage preset value calculation three phase full bridge PWM rectification circuits
Time and duty cycle, and according to make-and-break time and duty cycle corresponding control signal is provided to the switching device of each bridge arm.
Optionally, the step of providing corresponding control signal to the switching device of each bridge arm includes：According to make-and-break time and
Duty cycle updates PWM comparand registers, to export modulated pwm control signal according to the fiducial value of PWM comparand registers.
Optionally, further included before the step of carrying out Real-time Feedback calculating：Judge whether power supply change-over device opens work(
Rate factor correcting function, and only in the case where opening the power factor emendation function, just perform the step that Real-time Feedback calculates
Suddenly.
The power supply change-over device and its control method for transducer air conditioning of the present invention employs active power correction skill
Art gathers the DC voltage after the input current of each phase of three-phase alternating-current supply and input voltage and rectification, utilizes these letters
Number to rectification circuit carry out real-time feedback control so that the output voltage stabilization of rectification circuit in reference voltage level and cause
The input current phase of three-phase alternating-current supply follows the input voltage phase of three-phase alternating-current supply.Carrying out the process of feedback control
In, it is adjusted in real time according to the working condition of circuit in real time, it is ensured that power factor is close to 1, and harmonic content is small.
Further, the power supply change-over device for transducer air conditioning of the invention, by AC current collecting circuit,
AC voltage sampling circuit is improved, and reduces the complexity of circuit, is simplified acquisition signal, is reduced sampling error,
Save hardware cost.
Further, the power supply change-over device for transducer air conditioning of the invention is effectively guaranteed rectification output
Voltage expands the torque range of compressor continually and steadily in set-point, increases the carrying load ability of air conditioner.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Description of the drawings
Some specific embodiments of detailed description of the present invention by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference numeral denotes same or similar component or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing：
Fig. 1 is the schematic structure frame of the power supply change-over device according to an embodiment of the invention for transducer air conditioning
Figure；
Fig. 2 is the circuit diagram of the power supply change-over device according to an embodiment of the invention for transducer air conditioning；
Fig. 3 is showing for the control method of the power supply change-over device according to an embodiment of the invention for transducer air conditioning
It is intended to；
Fig. 4 be the power supply change-over device according to an embodiment of the invention for transducer air conditioning control method in into
The control principle drawing of row feedback control；And
Fig. 5 is the stream of the control method of the power supply change-over device according to an embodiment of the invention for transducer air conditioning
Journey schematic diagram.
Specific embodiment
Fig. 1 is the schematic knot of the power supply change-over device 100 according to an embodiment of the invention for transducer air conditioning
Structure block diagram.This can include in general manner for the power supply change-over device 100 of transducer air conditioning：AC power input circuit 110,
Rectification circuit 120, AC current collecting circuit 130, AC voltage sampling circuit 140, DC voltage Acquisition Circuit 150, number
Signal processor 160, inverter circuit 170.
AC power input circuit 110, for connecting external three-phase alternating-current supply, in the present embodiment, three-phase is marked respectively
Know for R phases, S-phase, T-phase.The three-phase alternating-current supply can be obtained generally by external electrical network.
Rectification circuit 120 is connected with AC power input circuit 110, three-phase alternating-current supply is carried out for controllably whole
Stream.Rectification circuit 120 can preferably use three phase full bridge PWM rectification circuits 120, and each of which bridge arm includes an IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) and corresponding afterflow two in parallel
Pole pipe.
AC current collecting circuit 130, for gathering the input current signal of three-phase alternating-current supply.AC voltage sampling electricity
Road 140, for gathering input voltage signal in three-phase alternating-current supply.DC voltage Acquisition Circuit 150, for gathering rectified electricity
Output voltage signal after 120 rectification of road.It is intersecting that digital signal processor 160 can be calculated three according to input current signal
The input current value in galvanic electricity source；The input voltage value of three-phase alternating-current supply is calculated according to input voltage signal；According to output
The output voltage values of rectification circuit 120 are calculated in voltage signal.
In order to reduce signal acquisition amount, the complexity of circuit is reduced, ac current measurement circuit can be serially connected with three-phase
It the current sensor of two-phase and is followed in the supply line of AC power with two groups of signals that current sensor is connected respectively
Device.Alternating current voltage measuring circuit includes：It is respectively used to the two groups of signals handled two groups of line voltages of three-phase alternating-current supply
Amplifier.Digital signal processor 160 is connected respectively with the output terminal of two groups of signal followers and two groups of signal amplifiers,
And it is configured to be calculated the three-phase input current value of three-phase alternating-current supply, root according to the biphase current signal of three-phase alternating-current supply
The three-phase input voltage value of three-phase alternating-current supply is calculated according to two groups of line voltages of three-phase alternating-current supply.Since three phase mains exists
In the state of balance, three-phase voltage and three-phase current are in equilibrium state, and digital signal processor 160 can pass through two-way phase
Current signal, two-route wire voltage signal by the way that three-phase voltage value and three-phase electricity flow valuve is calculated, compared with the prior art in often
Six tunnels of Yong gather signal, reduce two-way.
The input current value of three-phase alternating-current supply, input voltage value and whole is being calculated in digital signal processor 160
After the output voltage values of current circuit 120, reference voltage level and input current value, input voltage value, output can also be utilized
Voltage value carries out Real-time Feedback calculating, to provide control signal to rectification circuit 120 according to feedback result of calculation so that rectified current
The output voltage stabilization on road 120 is in reference voltage level and the input current phase of three-phase alternating-current supply is caused to follow three to intersect
The input voltage phase in galvanic electricity source, wherein reference voltage are preset 120 output voltage desired value of rectification circuit.In this reality
Apply in example, digital signal processor 160 can use DSP or other with certain computing capability, and input/output interface
(I/O) device met the requirements.
The feedback control algorithm of digital signal processor 160 can use dual proportional integral derivative to feed back (PID) algorithm,
Such as digital signal processor 160 can carry out the first proportional integral derivative adjusting and the conversion of corresponding first signal first,
So that the output voltage stabilization of rectification circuit 120 is in reference voltage level and obtains three-phase current setting value, second is then carried out
Proportional integral derivative adjusts and corresponding secondary signal conversion so that the input current phase of three-phase alternating-current supply follows three-phase
The input voltage phase of AC power simultaneously obtains three-phase voltage setting value.Wherein the first proportional integral derivative is adjusted with output voltage
Signal is as feedback signal, and reference voltage level is as echo signal；Second proportional integral derivative, which is adjusted, can use input
Current signal is as feedback signal, and three-phase current setting value is as echo signal.
In the case where rectification circuit 120 uses three phase full bridge PWM rectification circuits 120, digital signal processor 160 may be used also
With the make-and-break time and duty cycle according to 120 each bridge arm of three-phase voltage preset value calculation three phase full bridge PWM rectification circuits, and according to
Make-and-break time and duty cycle provide corresponding control signal inverter circuit 170 to the switching device of each bridge arm, by rectification circuit 120
The DC inverter of output is the driving power of the compressor of driving transducer air conditioning.
Inverter circuit 170, the DC inverter that rectification circuit 120 is exported are the drive of the compressor of driving transducer air conditioning
Dynamic power supply.Inverter circuit 170 can be according to air conditioner
In addition, the power supply change-over device of the present embodiment further includes three-phase reactor and bus capacitor, three-phase reactor
It is serially connected in the supply line of three-phase alternating-current supply, bus capacitor is parallel to the output terminal of rectification circuit 120, so as to utilize electricity
Anti- device and capacitor carry out energy storage, exoergic.
Fig. 2 is the circuit signal of the power supply change-over device 100 according to an embodiment of the invention for transducer air conditioning
Figure.In this embodiment, three-phase alternating current R, S, T is connected to rectification circuit 120 by three-phase reactor LR, LS, LT respectively,
The first electric transducer CaR is serially connected in middle R phases, the second electric transducer CaS, the first electric transducer CaR and second is serially connected in S-phase
The electric current passed through in R phases, S-phase is converted to voltage signal by electric transducer CaS respectively.Operational amplifier OP3 and resistance R9,
R10 forms the first signal follower, and the corresponding voltage signal of R phase currents is isolated, and improves input impedance, and output corresponds to
The first ac current signal IR.Operational amplifier OP4 and resistance R11, R12 form secondary signal follower, to S-phase electric current
Corresponding voltage signal is isolated, and improves input impedance, exports corresponding second ac current signal IS.
Operational amplifier OP1 and resistance R5, R6, R7 form the first signal amplifier, and input terminal passes through resistance respectively
R1, R3 are connected to R phases, T-phase, so as to be detected to the line voltage of R phase T-phase, so as to be carried out to the line voltage signal of R phase T-phase
Isolation, and input impedance is improved, export corresponding first ac voltage signal VTR.Wherein voltage Vref1 is operational amplifier
Reference voltage.
Operational amplifier OP2 and resistance R8 forms secondary signal amplifier, and input terminal is connected respectively by resistance R2, R4
S-phase, R phases are connected to, so as to be detected to the line voltage of R phase S-phase, so as to isolate to the line voltage signal of R phase S-phase, and
Input impedance is improved, exports corresponding second ac voltage signal VRS.
The busbar voltage that resistance R13, R14 export rectification circuit 120 divides, and obtains reflecting rectified circuit 120
The output voltage signal Vdc of busbar voltage after rectification.
First ac current signal IR, the second ac current signal IS, the first ac voltage signal VTR, the second alternating current
Signal VRS, output voltage signal Vdc are pressed, the analog input interface of digital signal processor 160 is respectively connected to, by counting
Word signal processor 160 is sampled, and is converted to digital signal and is calculated, so as to obtain the respective reality of R, S, T three-phase
Phase voltage VR, VS, VT, R, S, T three-phase respective actual phase current IR, IS, IV；120 output voltage Vdc of rectification circuit.
Digital signal processor 160 carries out computing to above-mentioned signal according to default feedback, according to by SPWM
(sinusoidal pulse width modulation, Sinusoidal Pulse Width Modulation) rule exports six tunnels control letter to rectified signal
Number PWM1 to PWM6.
Rectification circuit 120 uses three phase full bridge PWM rectification circuits, wherein each bridge arm includes an IGBT (Insulated
Gate Bipolar Transistor, insulated gate bipolar transistor) and corresponding fly-wheel diode in parallel.Wherein Q1
The upper bridge arm of R phases is formed with D1, Q3 and D3 form the upper bridge arm of S-phase, and Q5 and D5 are the upper bridge arm for forming T-phase, and Q2 and D2 form R
The lower bridge arm of phase, Q4 and D4 form the lower bridge arm of S-phase, and Q5 and D5 are the lower bridge arm for forming T-phase.Six tunnel control signal PWM1 are extremely
PWM6 is respectively used to control Q1 to Q6, this six IGBT is made to make R, S, T three-phase current according to certain rules according to control signal break-make
It is stored up by reactor LR, LS, LT, Q1 to Q6 and sustained diode 1 to D6, bus capacitor C1 in reactor LR, LS, LT
It deposits energy and releases energy, so that R, S, T three-phase current phase follow the phase of corresponding phase voltage in real time, improve power factor
With raising and the output voltage of stable rectification circuit 120.
The present embodiment additionally provides a kind of control method of the power supply change-over device 100 for transducer air conditioning, the control
Method can be used for the power supply change-over device for controlling any of the above-described embodiment, and Fig. 3 is according to an embodiment of the invention is used for
The schematic diagram of the control method of the power supply change-over device 100 of transducer air conditioning, this is used for the power supply change-over device of transducer air conditioning
100 control method can include in general manner：
It is intersecting to be calculated three according to input current signal, input voltage signal, output voltage signal respectively by step S302
The output voltage values of the input current value in galvanic electricity source, input voltage value and rectification circuit 120；
Step S304 is carried out anti-in real time using reference voltage level and input current value, input voltage value, output voltage values
Feedback calculates, and reference voltage is preset 120 output voltage desired value of rectification circuit；
Step S306 provides control signal so that rectification circuit 120 according to feedback result of calculation to rectification circuit 120
Output voltage stabilization is in reference voltage level and the input current phase of three-phase alternating-current supply is caused to follow three-phase alternating-current supply
Input voltage phase.
The pid algorithm of double feedback loops may be employed in step S304, and detailed process can be：The first proportion differential is carried out first
Integral adjustment and corresponding first signal conversion so that the output voltage stabilization of rectification circuit 120 in reference voltage level simultaneously
Three-phase current setting value is obtained, then carries out the second proportional integral derivative adjusting and the conversion of corresponding secondary signal so that three
The input current phase of cross streams power supply follows the input voltage phase of three-phase alternating-current supply and obtains three-phase voltage setting value.The
One proportional integral derivative is adjusted using output voltage signal as feedback signal, and reference voltage level is as echo signal；Second
Proportional integral derivative is adjusted using input current signal as feedback signal, and three-phase current setting value is as echo signal.
In the case that rectification circuit 120 is three phase full bridge PWM rectification circuits, step S306 can also be set according to three-phase voltage
The make-and-break time and duty cycle of each bridge arm of fixed value calculation three phase full bridge PWM rectification circuits, and according to make-and-break time and duty cycle to
The switching device of each bridge arm provides corresponding control signal.Specifically control signal presentation mode is：According to make-and-break time and account for
Sky is than update PWM comparand registers, to export modulated pwm control signal according to the fiducial value of PWM comparand registers.
In addition, it is further included before the step of carrying out Real-time Feedback calculating：Judge whether power supply change-over device opens power
Factor correcting function, and only in the case where opening the power factor emendation function, just perform the step of Real-time Feedback calculates.
Fig. 4 is the control method of the power supply change-over device 100 according to an embodiment of the invention for transducer air conditioning
The middle control principle drawing for carrying out feedback control.
Output voltage signal VDCAnd the reference voltage level V of settingrefAnd R, S, T three-phase is measured is calculated
Actual phase voltage VR, VS, VT obtain the electric current setting of R, S, T three-phase after the first PID is adjusted and corresponding first converts
Value Iref_R、Iref_S、Iref_T.First PID adjusts the outer loop feedback control adjusted as 120 voltage of rectification circuit, ensures rectification
The output voltage V of circuit 120DCStablize the reference voltage level V for being held in settingref。
R, measured actual phase current IR, IS, IV being calculated of S, T three-phase；And phase voltage VR, VS, VT pass through
After 2nd PID adjustings and corresponding second conversion, the reference target value V of the respective phase voltage of R, S, T three-phase is obtainedPWM_R、
VPWM_S、VPWM_T.2nd PID adjust as three-phase phase current IR, IS, IV adjust inner loop feedback control, in real time adjustment IR,
The phase of IS, IV make it follow the phase of corresponding phase voltage VR, VS, VT respectively, so that power factor improves, close to
1.And since the waveform of three-phase phase current IR, IS, IV maintain sinusoidal waveform, the humorous of each phase of three phase mains can be greatly reduced
Wave component and content.
Reference target value VPWM_R、VPWM_S、VPWM_TIt as input, is modulated by SPWM, 120 three-phase of rectification circuit of calculating
Corresponding make-and-break time TR, TS, TV of bridge arm and duty cycle d1, d2, d3, the calculation formula of wherein duty cycle are：
In the formula, x represents phase, value R, S, T, and Vo is DC output voltage, and L, r are coefficient, Vdc- it is rectified current
The benchmark of the output voltage on road 120.
It is modulated by SPWM, the drive signal control signal PWM1 to PWM6 of output is respectively used to control Q1 to Q6, makes this
Six IGBT are according to control signal break-make, wherein PWM1 and PWM2, PWM3 and PWM4, PWM5 and PWM6, complementary respectively namely work as
When the upper bridge arm of one phase is connected, lower bridge arm accordingly turns off.In the initial state, Q1 to Q6 is off-state, digital signal
Processor 160 provides the pwm signal of the break-make of rectification circuit 120IGBT according to duty cycle d1, d2, d3.
Feedback control is carried out according in the control method for the power supply change-over device 100 of transducer air conditioning of the present embodiment
Principle controls required measuring signal (including IR, IS, IV, VR, VS, VT, VDC) both from AC current collecting circuit 130,
This few fractional hardware circuit of AC voltage sampling circuit 140, DC voltage Acquisition Circuit 150, the control signal of final output
PWM1 to PWM6 pressure acquisitions are supplied to rectification circuit 120.
When pwm signal is high level, the IGBT for corresponding to bridge arm is turned on, and complementary pair answers the IGBT of bridge arm to turn off.Using R phases as
Example, when Q2 is turned on, electric current flows through D4 or D6, reaches S-phase or T-phase and its corresponding reactor from R phase Q2.On reactor current
It rises, stores energy, when Q2 is turned off, reactor current declines, and the energy of storage is transferred to by D4 or D6 in capacitance group, for negative
It carries and uses, then reach S-phase or T-phase.By adjusting the duty cycle of pwm signal, make three-phase input current and corresponding input electricity
Same-phase is pressed, and 120 output voltage of rectification circuit is made to be increased to a steady state value.
Fig. 5 is the control method of the power supply change-over device 100 according to an embodiment of the invention for transducer air conditioning
Flow diagram；The control method of the embodiment can perform following steps successively：
Step S502 interrupts entrance into PWM；
Step S504 reads the sampled result by ADC；
Step S506 carries out sampled-data processing, show that three-phase electricity flow valuve, three-phase voltage value, rectification circuit 120 export electricity
Pressure value；
Step S508 carries out protection processing, detection three-phase electricity flow valuve, three-phase voltage value, 120 output voltage values of rectification circuit
It is whether abnormal, and the starting protection in exception；
Step S510, it is determined whether to enable PFC functions, if continuing to execute step S512 and subsequent step, if otherwise moving back
Go out to interrupt, finishing control；
Step S512 carries out Voltage loop feedback control calculating；
Step S514 carries out electric current loop reference value calculating；
Step S516 carries out electric current loop feedback control calculating；
Step S518 calculates PWM comparand register values；
Step S520 exits interruption, finishing control.
The control method of the present embodiment is controlled using bicyclic PID/feedback, and inner ring carries out current phase adjusting, and outer shroud carries out whole
Galvanic electricity pressure is adjusted.After power factor emendation function is opened, the analog signal of acquisition is subjected to ADC (Analog-digital Converter), and
Sampled data is handled.Then input current, input voltage are carried out, output voltage is abnormal and temperature of power module is abnormal etc.
Protection detection.
After PFC open commands are received, outer voltage, then calculating current inner ring are calculated first, are finally calculated PWM and are relatively posted
The fiducial value of storage.Fiducial value and fixed cycle of the digital signal processor 160 according to the PWM comparand registers of real-time update
Value draws the driving pwm signal of control IGBT.
The power supply change-over device 100 and its control method for transducer air conditioning of the present embodiment, employs active power
Alignment technique gathers the DC voltage after the input current of each phase of three-phase alternating-current supply and input voltage and rectification, utilizes
These signals carry out real-time feedback control to rectification circuit 120 so that the output voltage stabilization of rectification circuit 120 is in reference voltage
It is worth and cause the input current phase of three-phase alternating-current supply to follow the input voltage phase of three-phase alternating-current supply.It is carrying out instead
Feedback control during, adjusted in real time according to the working condition of circuit in real time, it is ensured that power factor close to 1, and
And harmonic content is small.And the power supply change-over device 100 and its control method for transducer air conditioning of the present embodiment pass through it is right
AC current collecting circuit 130, AC voltage sampling circuit 140 are improved, and are reduced the complexity of circuit, are simplified and adopt
Collect signal, reduce sampling error, save hardware cost.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or derive many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of power supply change-over device for transducer air conditioning, including：
AC power input circuit, for connecting external three-phase alternating-current supply；
Rectification circuit is connected with the AC power input circuit, for controllably carrying out rectification to the three-phase alternating-current supply；
AC current collecting circuit, for gathering the input current signal of the three-phase alternating-current supply；
AC voltage sampling circuit, for gathering input voltage signal in the three-phase alternating-current supply；
DC voltage Acquisition Circuit, for gathering the output voltage signal after the rectifier circuit rectifies；
Digital signal processor, for respectively according to the input current signal, the input voltage signal, the output voltage
The output voltage of the input current value of the three-phase alternating-current supply, input voltage value and the rectification circuit is calculated in signal
Value, and carried out using reference voltage level and the input current value, the input voltage value, the output voltage values real-time anti-
Feedback calculates, to provide control signal to the rectification circuit according to feedback result of calculation so that the output electricity of the rectification circuit
Pressure is stable at the reference voltage level and so that the input current phase of the three-phase alternating-current supply follows the three-phase alternating current
The input voltage phase of power supply, wherein the reference voltage is the preset Output Voltage in Rectified Circuits desired value；With
And
Inverter circuit, the DC inverter that the rectification circuit is exported are the driving for the compressor for driving the transducer air conditioning
Power supply.
2. power supply change-over device according to claim 1, wherein,
The ac current measurement circuit includes：It is serially connected with the current sense of two-phase in the supply line of the three-phase alternating-current supply
Device and two groups of signal followers being connected respectively with the current sensor；
The alternating current voltage measuring circuit includes：It is respectively used to what two groups of line voltages of the three-phase alternating-current supply were handled
Two groups of signal amplifiers；
The digital signal processor is distinguished with the output terminal of two groups of signal followers and two groups of signal amplifiers
Connection, and it is configured to be calculated the three-phase of the three-phase alternating-current supply according to the biphase current signal of the three-phase alternating-current supply
The three-phase input of the three-phase alternating-current supply is calculated according to the two of the three-phase alternating-current supply groups of line voltages for input current value
Voltage value.
3. power supply change-over device according to claim 1, wherein the digital signal processor is configured to：
The first proportional integral derivative adjusting and the conversion of corresponding first signal are carried out, so that the output electricity of the rectification circuit
Pressure is stable at the reference voltage level and obtains three-phase current setting value, and first proportional integral derivative is adjusted with the output
Voltage signal is as feedback signal, and the reference voltage level is as echo signal；
Carry out the second proportional integral derivative adjusting and the conversion of corresponding secondary signal so that the input of the three-phase alternating-current supply
Current phase follows the input voltage phase of the three-phase alternating-current supply and obtains three-phase voltage setting value, and second ratio is micro-
Divide integral adjustment using the input current signal as feedback signal, and the three-phase current setting value is as echo signal.
4. power supply change-over device according to claim 3, wherein
The rectification circuit is three phase full bridge PWM rectification circuits；And
The digital signal processor is configured to the three phase full bridge PWM rectifications according to the three-phase voltage preset value calculation
The make-and-break time and duty cycle of each bridge arm of circuit, and according to the make-and-break time and the duty cycle to the switch of each bridge arm
Device provides corresponding control signal.
5. power supply change-over device according to any one of claim 1 to 4, wherein further including：
Three-phase reactor is serially connected in the supply line of the three-phase alternating-current supply；And
Bus capacitor is parallel to the output terminal of the rectification circuit.
6. a kind of control method of power supply change-over device for transducer air conditioning, wherein the power supply change-over device includes：It hands over
Power supply input circuit is flowed, for connecting external three-phase alternating-current supply；Rectification circuit connects with the AC power input circuit
It connects, for controllably carrying out rectification to the three-phase alternating-current supply；AC current collecting circuit, for gathering the three-phase alternating current
The input current signal of power supply；AC voltage sampling circuit, for gathering input voltage signal in the three-phase alternating-current supply；Directly
Voltage collection circuit is flowed, for gathering the output voltage signal after the rectifier circuit rectifies；Inverter circuit, by the rectification
The DC inverter of circuit output is drives the driving power of the compressor of the transducer air conditioning, and the control method bag
It includes：
Respectively described three are calculated according to the input current signal, the input voltage signal, the output voltage signal
The output voltage values of the input current value of cross streams power supply, input voltage value and the rectification circuit；
It is carried out using reference voltage level and the input current value, the input voltage value, the output voltage values anti-in real time
Feedback calculates, and the reference voltage is the preset Output Voltage in Rectified Circuits desired value；
Control signal is provided to the rectification circuit so that the output voltage stabilization of the rectification circuit according to feedback result of calculation
The input of the three-phase alternating-current supply is followed in the input current phase of the reference voltage level, and the three-phase alternating-current supply
Voltage-phase.
7. control method according to claim 6, wherein, the step of carrying out Real-time Feedback calculating, includes：
The first proportional integral derivative adjusting and the conversion of corresponding first signal are carried out, so that the output electricity of the rectification circuit
Pressure is stable at the reference voltage level and obtains three-phase current setting value, and first proportional integral derivative is adjusted with the output
Voltage signal is as feedback signal, and the reference voltage level is as echo signal；
Carry out the second proportional integral derivative adjusting and the conversion of corresponding secondary signal so that the input of the three-phase alternating-current supply
Current phase follows the input voltage phase of the three-phase alternating-current supply and obtains three-phase voltage setting value, and second ratio is micro-
Divide integral adjustment using the input current signal as feedback signal, and the three-phase current setting value is as echo signal.
8. control method according to claim 7, wherein the rectification circuit is three phase full bridge PWM rectification circuits；And
The step of providing control signal to the rectification circuit according to feedback result of calculation further includes：
According to the make-and-break time and duty of each bridge arm of three phase full bridge PWM rectification circuits described in the three-phase voltage preset value calculation
Than, and according to the make-and-break time and the duty cycle corresponding control signal is provided to the switching device of each bridge arm.
9. control method according to claim 8, wherein, provide corresponding control letter to the switching device of each bridge arm
Number the step of include：
According to the make-and-break time and duty cycle update PWM comparand registers, with according to the ratio of the PWM comparand registers
Modulated pwm control signal is exported compared with value.
10. the control method according to any one of claim 6 to 9, wherein carry out Real-time Feedback calculating the step of it
Before further include：
Judge whether the power supply change-over device opens power factor emendation function, and only opening the PFC work(
In the case of energy, the step of Real-time Feedback calculates just is performed.
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| CN201611023793.4A CN108075670A (en) | 2016-11-14 | 2016-11-14 | For the power supply change-over device and its control method of transducer air conditioning |
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| CN201611023793.4A CN108075670A (en) | 2016-11-14 | 2016-11-14 | For the power supply change-over device and its control method of transducer air conditioning |
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| CN109768719A (en) * | 2019-01-21 | 2019-05-17 | 广东美的制冷设备有限公司 | Drive control circuit plate and air conditioner |
| CN109980915A (en) * | 2019-05-17 | 2019-07-05 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
| CN110190760A (en) * | 2019-05-28 | 2019-08-30 | 上海联影医疗科技有限公司 | High pressure generator fairing |
| CN110557038A (en) * | 2019-09-29 | 2019-12-10 | 重庆和诚电器有限公司 | full-MOS tube voltage regulator of motorcycle of full-wave synchronous rectification |
| CN110582153A (en) * | 2019-08-01 | 2019-12-17 | 福建睿能科技股份有限公司 | Driving circuit, driving method thereof and electronic ballast |
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| CN111061330A (en) * | 2019-12-30 | 2020-04-24 | 上海新时达电气股份有限公司 | Frequency converter bus voltage correction method and device, electronic equipment and storage medium |
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