CN102388528A - DC power source device and inverter device and air-conditioner using these - Google Patents

DC power source device and inverter device and air-conditioner using these Download PDF

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Publication number
CN102388528A
CN102388528A CN2010800156861A CN201080015686A CN102388528A CN 102388528 A CN102388528 A CN 102388528A CN 2010800156861 A CN2010800156861 A CN 2010800156861A CN 201080015686 A CN201080015686 A CN 201080015686A CN 102388528 A CN102388528 A CN 102388528A
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China
Prior art keywords
current
current waveform
voltage
inverter
power
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CN2010800156861A
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Chinese (zh)
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CN102388528B (en
Inventor
京极章弘
土山吉朗
吉田泉
川崎智广
前田志朗
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion 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
    • H02M7/21Conversion 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
    • H02M7/217Conversion 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
    • H02M7/219Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4233Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0083Converters characterised by their input or output configuration
    • H02M1/0085Partially controlled bridges
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/42Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208Arrangements for improving power factor of AC input
    • H02M1/4225Arrangements for improving power factor of AC input using a non-isolated boost converter
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Abstract

A DC power source device that converts AC voltage from an AC power source (1) to DC voltage is provided with: switching means (4) that short-circuits/open-circuits the AC power source (1) through a reactor (2); a current waveform storage section (8c) that stores a plurality of current waveform patterns including a substantially sinusoidal first current waveform pattern and a second current waveform pattern having a depression at the phase where the voltage of the AC power source (1) is a peak; a current waveform selection section (8d) that selects a single current waveform pattern from the current waveform storage section (8c), depending on the load; and a control section that controls the switching means (4) so that the current waveform of the input current from the AC power source (1) is a current waveform having an amplitude proportional to the current waveform pattern selected by the current waveform selection section (8d).

Description

Continuous-current plant and inverter drive device and use its air conditioner
Technical field
The present invention relates in the time will converting direct voltage into from the alternating voltage that exchanges power supply; Above-mentioned AC power is carried out the continuous-current plant of short circuit open circuit through switching mechanism via reactor (reactor); With possess the inverter that this continuous-current plant comes drives inverter and drive device and the air conditioner that uses it.
Background technology
In the prior art, exist a kind ofly in the time will converting direct voltage into, above-mentioned AC power is carried out the continuous-current plant of short circuit open circuit via reactor through switching mechanism from the alternating voltage that exchanges power supply.In this continuous-current plant, generally be connected with the smmothing capacitor of the ripple (ripple) that is used to reduce output voltage at its dc output end.
Generally speaking, in smmothing capacitor, flow through and the corresponding ripple current of output voltage ripple, this ripple current becomes the smmothing capacitor reason for heat.In order to suppress this heating, the ripple current that needs to flow through smmothing capacitor is suppressed at below the permissible value.But,, need make the electric capacity of smmothing capacitor become big for ripple current is suppressed at below the permissible value.So this becomes the main cause that hinders the continuous-current plant miniaturization.
In the prior art, the continuous-current plant of not following the maximization ground of capacitor to reduce the ripple current that flows through smmothing capacitor for example is disclosed in (with reference to Figure 11) in the patent documentation 1.This continuous-current plant has: the reactor 2 of input ac power 1, to the output of reactor 2 carry out rectification rectification circuit 5, to the output of rectification circuit 5 carry out level and smooth smmothing capacitor 6, to the output of rectification circuit 5 the open circuit switch element (switching mechanism) 4 of (chopping) and the circuit breaker that boosts (chopper) circuit that constitutes by diode 8.And; This continuous-current plant is with the voltage waveform (Figure 12 (a)) of the AC power 1 of input and carry out add operation by the voltage waveform (Figure 12 (b)) of settings such as function generator 21a through adder 21b in advance; Drive signal (Figure 12 (c)) through being obtained by add operation drives the breaker circuit that boosts, and obtains the input current of the waveform shown in Figure 12 (d).Become the waveform shown in Figure 12 (d) through input current, can reduce the ripple current of smmothing capacitor 6.
The prior art document
Patent documentation
Patent documentation 1: No. 2590134 communique of patent
Summary of the invention
Invent problem to be solved
But, comprise more harmonic components in the input current of above-mentioned existing continuous-current plant.Promptly; Can not be 1 with power factor controlling; At current capacity (the current capacity that such continuous-current plant is used for through socket (perhaps circuit breaker); Ampacity, current capacity) (below be expressed as the socket capacity) limits under the situation of equipment of its maximum output, and the maximum output of equipment reduces.
In addition; In above-mentioned existing continuous-current plant; The drive signal that adds the waveform generation that the voltage waveform of regulation obtains through the voltage waveform based on AC power drives breaker circuit; So according to the size of AC supply voltage, the ratio of the harmonic current that input current waveform is contained changes.And under the low situation of supply voltage, it is big that the distortion rate of input current becomes relatively.
The present invention is in order to solve above-mentioned existing problem; Its purpose is; Provide a kind of maximum output ground that can not reduce continuous-current plant to suppress the mean value that flows through the ripple current of smmothing capacitor between whole on-stream period lower, and irrespectively the containing ratio of supply harmonic is remained on the continuous-current plant below the certain value with AC supply voltage.In addition, its purpose is, a kind of air conditioner that this continuous-current plant comes the inverter driving device of drives inverter and uses it that possesses is provided.
Be used to solve the method for problem
In first aspect, a kind of continuous-current plant that will convert direct voltage from the alternating voltage that exchanges power supply into is provided.This DC power supply has: switching mechanism, and it carries out the short circuit open circuit via reactor to above-mentioned AC power; The current waveform storage part; It stores a plurality of current waveform patterns; These a plurality of current waveform patterns comprise: roughly sinuous first current waveform pattern and the phase place that has voltage in above-mentioned AC power and become peak value have the waveform pattern of recess or make the second current waveform pattern that becomes any characteristic of the smooth waveform pattern of the corresponding part of the phase place of peak value with the voltage of above-mentioned AC power; Current waveform selection portion, it selects a current waveform pattern according to load from above-mentioned current waveform storage part; And control part, it is controlled above-mentioned switching mechanism, so that become the current waveform that has with the proportional amplitude of being selected by above-mentioned current waveform selection portion of current waveform pattern from the current waveform of the input current of above-mentioned AC power.
In second aspect, provide a kind of inverter to drive device.This drive unit has: load is the continuous-current plant put down in writing of first mode of inverter load and the inverter control part that above-mentioned inverter load is controlled.
In the third aspect, provide a kind of inverter to drive device.This inverter drives device to have: load is the continuous-current plant that first mode of inverter load is put down in writing; With inverter is controlled so that become the inverter control part below the current limit value that the operating condition according to above-mentioned inverter load is predetermined from the input current of above-mentioned AC power.Current waveform selection portion; Under according to the current limit value of the operating condition of the above-mentioned inverter load decision situation bigger, select the above-mentioned first current waveform pattern, selecting the above-mentioned second current waveform pattern under than the little situation of the current threshold of afore mentioned rules according to the above-mentioned current limit value of the operating condition decision of above-mentioned inverter load than predetermined electric current threshold value.
In fourth aspect, provide a kind of inverter to drive device.This inverter drives device to have: load is the continuous-current plant that the first aspect of inverter load is put down in writing; With the inverter control part that above-mentioned inverter load is controlled.Current waveform selection portion; Select the above-mentioned first current waveform pattern in the driving frequency of above-mentioned inverter control part under than the big situation of the assigned frequency that is predetermined, selecting the said second current waveform pattern under than the little situation of the current threshold of afore mentioned rules according to the current limit value of the operating condition decision of above-mentioned inverter load.
In aspect the 5th, a kind of air conditioner is provided.This air conditioner has the described continuous-current plant of first aspect.
In aspect the 6th, a kind of air conditioner is provided.This air conditioner has the described inverter of second aspect and drives device.
The invention effect
According to above-mentioned modes; From comprising the roughly sinuous first current waveform pattern; Having the waveform pattern of recess with the phase place that has voltage in above-mentioned AC power and become peak value or making with the voltage of above-mentioned AC power becomes in a plurality of current waveform patterns of the second current waveform pattern of any characteristic of the smooth waveform pattern of the corresponding part of the phase place of peak value, according to current waveform pattern of load selection.And, above-mentioned switching mechanism is controlled, so that become the current waveform that has with the proportional amplitude of selecting by above-mentioned current waveform selection portion of current waveform pattern from the current waveform of the input current of above-mentioned AC power.
For example during near the heavy duty of the current value of socket capacity action,, can power factor roughly be controlled to be 1 through input current waveform is adopted the roughly sinuous first current waveform pattern with input current.The first current waveform pattern is a sinusoidal wave shape, and the containing ratio of supply harmonic is very low.Therefore, can the socket capacity limitation be brought up in the maximum output of continuous-current plant.In other words, according to this mode, when load is supplied with, can design the maximum consumption current value of the equipment of continuous-current plant and even lift-launch continuous-current plant lower identical maximum output.
Therewith relatively; The socket capacity is had under the situation of enough and to spare at input current; The waveform pattern that has recess through the phase place that input current waveform is adopted the voltage have in above-mentioned AC power become peak value; Perhaps making with the corresponding part of phase place that the voltage of AC power becomes peak value is the second current waveform pattern of arbitrary characteristic of smooth waveform pattern, can reduce the ripple current of smmothing capacitor.Generally speaking, drive at inverter in the equipment such as device and air conditioner, input current has the operating condition of enough and to spare to account for major part between whole on-stream period; And in the continuous-current plant of this mode; When this state, can reduce the ripple current of smmothing capacitor, suppress the heating of smmothing capacitor.
In addition; Because switching mechanism is controlled; So that become the current waveform that has with the proportional amplitude of selecting by above-mentioned current waveform selection portion of current waveform pattern from the current waveform of the input current of AC power; So with AC supply voltage irrespectively, the containing ratio of supply harmonic is constant.
As stated; Continuous-current plant according to this mode; The maximum output ground that can not reduce continuous-current plant suppresses the mean value that flows through the ripple current of smmothing capacitor between whole on-stream period lower, and irrespectively the containing ratio of supply harmonic is remained on below the certain value with AC supply voltage.
Description of drawings
Fig. 1 is the figure of circuit structure of the continuous-current plant of expression execution mode 1.
Fig. 2 is the input current and the direct voltage of the continuous-current plant of expression execution mode 1, and the figure of the voltage of AC power (when selecting the first current waveform pattern).
Fig. 3 A is the input current and the direct voltage of the continuous-current plant of expression execution mode 1, and the figure of the voltage of AC power (when selecting the second current waveform pattern).
Fig. 3 B is the input current and the direct voltage of the continuous-current plant of expression execution mode 1, and the figure of the voltage of AC power (other example when selecting the second current waveform pattern).
Fig. 4 A is the figure of system of selection of the current waveform pattern in the continuous-current plant of expression execution mode 1.
Fig. 4 B is other routine figure of system of selection of the current waveform pattern in the continuous-current plant of expression execution mode 1.
Fig. 5 A is expression first other routine figure (except the control part) about the circuit structure of the continuous-current plant of execution mode 1.
Fig. 5 B is expression second other routine figure (except the control part) about the circuit structure of the continuous-current plant of execution mode 1.
Fig. 5 C is expression the 3rd other routine figure (except the control part) about the circuit structure of the continuous-current plant of execution mode 1.
Fig. 6 is the figure that the inverter of expression execution mode 2 drives the structure of device.
Fig. 7 is the figure of the structure of inverter that expression has an execution mode 2 air conditioner that drives device.
Fig. 8 A be the expression execution mode 3 continuous-current plant (inverter driving device) alternating voltage phase detecting circuit 9 first the example figure.
Fig. 8 B is the figure of expression from the output waveform of the first routine circuit of the alternating voltage phase detecting circuit 9 of the continuous-current plant (inverter driving device) of execution mode 3.
Fig. 9 A be the expression execution mode 3 continuous-current plant (inverter driving device) alternating voltage phase detecting circuit 9 second the example figure.
Fig. 9 B is the figure of expression from the output waveform of the second routine circuit of the alternating voltage phase detecting circuit 9 of the continuous-current plant (inverter driving device) of execution mode 3.
Figure 10 is the figure of deduction method of alternating voltage phase place of the continuous-current plant (inverter driving device) of expression execution mode 3.
Figure 11 is the figure of the circuit structure of the existing continuous-current plant of expression.
Figure 12 is the figure of each waveform in the existing continuous-current plant of expression.Particularly, (a) waveform of the input voltage of expression AC power, (b) waveform of the voltage of expression add operation, (c) waveform of expression drive signal, (d) waveform of expression input current.
Embodiment
With reference to the accompanying drawings execution mode is described.In addition, the technological thought put down in writing of claim scope is not limited by execution mode.
(execution mode 1)
1. structure
Fig. 1 is the figure of circuit structure of the continuous-current plant of expression execution mode 1.
As shown in Figure 1, the continuous-current plant of execution mode 1 has: reactor 2, input current test section 3, switching mechanism 4, rectification circuit 5 and smmothing capacitor 6, direct voltage is supplied with to load 7.
Reactor 2 is connected with an end of AC power 1.
Input current test section 3 detects the electric current that flows through reactor 2.
Switching mechanism 4 carries out the short circuit open circuit via 2 pairs of AC powers of reactor 1.As long as switching mechanism 4 is for amphitropic, for example by the combinational circuit of a diode bridge and an IGBT, or two formations such as power MOSFET of connection in the other direction each other.
The ac input end of rectification circuit 5 is connected with the two ends of switching mechanism 4.
Smmothing capacitor 6 is connected between the dc output end of rectification circuit 5.
In addition, the continuous-current plant of this execution mode has: by control part 8 that constitutes and zero crossing (zero cross) testing circuits (alternating voltage phase detecting circuit 9) that is connected in the line-to-line of AC power 1 such as microcomputers.
Control part 8 has voltage-phase operational part 8a, voltage control division 8b, current waveform storage part 8c, the current waveform selection 8d of portion and current detecting part 8i.
The voltage-phase that voltage-phase operational part 8a infers computing AC power 1 according to the zero cross point and the power cycle of the AC power 1 that is obtained by alternating voltage phase detecting circuit 9.
Voltage control division 8b carries out the proportional integral compensation operation, so that the direct voltage of smmothing capacitor 6 becomes the direct voltage command value.
Current waveform storage part 8c stores two kinds of current waveform patterns.
Current detecting part 8i is through carrying out peak value and keep (peak hold) to handle or low pass filter processing etc. to the signal from input current test section 3, detect peak value and the virtual value of input current or be the size of the input current of benchmark with it.
The current waveform selection 8d of portion selects a current waveform pattern based on the size by the detected input current of current detecting part 8i from current waveform storage part 8c.
Control part 8 also has the current-order generation 8e of portion, current control division 8f, the carrier wave generation 8g of portion and the pwm signal generation 8h of portion, carries out the switch control of switching mechanism 4.
The alternating voltage phase place of the current-order generation 8e of portion through will being obtained by voltage-phase operational part 8a, the current amplitude value of calculating according to the current waveform pattern of being selected by the current waveform selection 8d of portion and from the output multiplication of voltage control division 8b generate current instruction value.
Current control division 8f carries out the proportional integral compensation operation, so that the instantaneous value of the input current that obtains from input current test section 3 becomes current instruction value.
The carrier wave generation 8g of portion generates carrier wave.
The pwm signal generation 8h of portion with the output of current control division 8f with make comparisons from the carrier wave of the carrier wave generation 8g of portion, generate the PWM drive signal of switching mechanism 4.
In addition, among the figure, in control part 8, for the direct voltage that constitutes by A/D change-over circuit etc. and the test section of input current, for easy and omit mark.
Fig. 2, Fig. 3 A and Fig. 3 B are input current and the figure of direct voltage of the continuous-current plant of expression execution mode 1.
Store and the identical current waveform pattern of input current waveform shown in Fig. 2, Fig. 3 A and Fig. 3 B at current waveform storage part 8c.
Fig. 2 has selected the input current and the direct voltage of the situation of the first current waveform pattern and the figure of the voltage of AC power 1 by the current waveform selection 8d of portion in the continuous-current plant of expression execution mode 1.The first current waveform pattern is the sinuous waveform with AC power 1 same frequency, same phase place, and is identical with the current waveform pattern of in the continuous-current plant of power-factor improvement type, using usually.
Fig. 3 A is illustrated in input current and the direct voltage of having selected the situation of the second current waveform pattern in the continuous-current plant of execution mode 1, and the figure of an example of the voltage of AC power 1.Shown in Fig. 3 A, the peak phase that the second current waveform pattern has at the voltage of AC power 1 has the shape of recess.That is 90 degree and 270 that, have the voltage peak phase place that is in AC power 1 are spent near the absolute value low characteristic of the absolute value of electric current than the electric current of the peak phase (P1, P2 and P3, P4 among the figure) of the electric current before and after it.Therefore; Under situation, littler than the situation of the first current waveform pattern shown in Figure 2 by the pulsation of the instantaneous electric power (=supply voltage * input current) of the product representation of the wave height value of the wave height value of the voltage of AC power 1 and input current with second current waveform pattern action.
Generally speaking; From rectification circuit 5 flow to the electric current voltage/direct voltage of input current * AC power 1 (be expressed as=) of smmothing capacitor 6 and the amplitude of the difference of the direct current supplied with to load 7 from smmothing capacitor 6 big more, the voltage ripple of smmothing capacitor 6 is just big more.In the continuous-current plant of this execution mode,, can suppress the ripple voltage and even the ripple current of smmothing capacitor 6 through selecting the second current waveform pattern.
In addition, the second current waveform pattern can be the waveform with a plurality of recesses, as long as the peak phase of the voltage of AC power 1 is included in the scope of this recess.
In addition, Fig. 3 B is illustrated in the continuous-current plant of execution mode 1, uses the situation of the waveform pattern different with Fig. 3 A, the figure of the example of the voltage of input current and direct voltage and AC power 1 as the second current waveform pattern.In the continuous-current plant of this execution mode; Be under the situation of the second current waveform pattern with the current waveform model selection shown in Fig. 3 B; Reduce a little though compare effect, compare the pulsation that also can suppress instantaneous electric power (=supply voltage * input current) with the situation of having selected the first current waveform pattern shown in Figure 2 with Fig. 3 A.Therefore, even when the current waveform pattern of having selected shown in Fig. 3 B, the same effect that can realize reducing the ripple current of smmothing capacitor 6 during also with the current waveform pattern of having selected Fig. 3 A.
2. the selection of current waveform pattern
Fig. 4 A is the figure of system of selection of current waveform pattern of the current waveform selection 8d of portion of the continuous-current plant of expression this execution mode 1.
Under the situation bigger than the threshold value of the input current shown in Fig. 4 A 1 by the size of the detected input current of current detecting part 8i, the current waveform selection 8d of portion selects the first current waveform pattern.
When selecting the first current waveform pattern, as shown in Figure 2, become sine wave from the input current of AC power 1 by FEEDBACK CONTROL.Therefore, can power factor roughly be remained 1.
In addition, under the situation that input current reduces, keep the first current waveform pattern, under the situation of the threshold value that is lower than input current 2, select the second current waveform pattern up to the threshold value that reaches the input current shown in Fig. 4 A 2.Like this, be provided with hysteresis (hysteresis) in the threshold value of input current, but this hysteresis is set at than follows the big value of variation of the input current value of power factor change.
When the second current waveform pattern of selection, input current is controlled to be the waveform that has recess like the voltage peak phase place of Fig. 3 AC power that A is shown in 1, perhaps shown in Fig. 3 B, make the smooth waveform of voltage peak phase bit position of AC power 1.Thus, can be during the voltage peak phase place of AC power 1 and front and back thereof suppress the change of input current and instantaneous electric power less.Therefore, during same load with compare and can the ripple of direct voltage suppressed less with the situation (Fig. 2) of first current waveform pattern action.
In the continuous-current plant of this execution mode, when selecting the second current waveform pattern, power factor step-down when comparing the first current waveform pattern of selection and selecting is so the input current during same load operation increases.But; In the continuous-current plant of this execution mode; As stated, owing in the threshold value of input current, be provided with than follow the bigger hysteresis of variation of the input current value of power factor change, so the vibration (hunting) can positively prevent the current waveform mode switch time.
3. sum up
As stated, the continuous-current plant of this execution mode stores a plurality of current waveform patterns, big and maximum the output under the load condition that limits by input current at input current, and being controlled to be becomes sinuous current waveform.Thus, realization remains power factor 1 action.On the other hand; Under the smaller load condition of input current; Input current is controlled to be the current waveform that has recess in the voltage peak phase place of AC power 1, perhaps makes the voltage and the suitable smooth current waveform of part of phase place that becomes peak value of AC power.Thus, can reduce the voltage ripple of smmothing capacitor 6.
In addition, in the continuous-current plant of this execution mode 1,, also can be employed in the only overlapping current waveform pattern of triple-frequency harmonics on the sine wave as the second current waveform pattern.
Triple-frequency harmonics is compared the supply harmonic restriction with the harmonic wave of other number of times limit value is high, so even also can fully overlapping current value with enough and to spare for the harmonic wave limits value of IEC.Thus, can constitute the current waveform pattern of this execution mode of the generation effect shown in Fig. 3 A or Fig. 3 B.
And in the continuous-current plant of this execution mode 1, its input current does not comprise five times bigger and seven times harmonic current composition of electric power system influence basically.Therefore, compare the situation that input current waveform is controlled to be waveforms such as trapezoidal wave, can reduce influence electric power system.
In addition, the storage means of current waveform pattern can be for storing the method for the reference amplitude data of every phase place at current waveform storage part 8c.Shown in the continuous-current plant of this execution mode, under the situation that only constitutes the second current waveform pattern, also can try to achieve through twice SIN computing sum of first-harmonic and triple-frequency harmonics by first-harmonic and triple-frequency harmonics.
4. other example
Fig. 4 B is other routine figure of system of selection of current waveform pattern of the continuous-current plant of expression this execution mode 1.
In this example, as shown in Figure 1, continuous-current plant also has the temperature detecting part 31 that detects environment temperature.Shown in Fig. 4 B, in the method, the reference current value of regulation is set to high more then its high more current value of environment temperature.Particularly, the effect on service life of smmothing capacitor 6 is being become under the high state of big environment temperature the second current waveform pattern of preferentially selecting the ripple current of smmothing capacitor 6 to reduce.Thus, can further prolong the life-span of smmothing capacitor 6.
In this execution mode; Circuit structure as continuous-current plant; Interchange input side at rectification circuit 5 is illustrated via the situation of reactor 2 with the circuit structure shown in Figure 1 of AC power 1 short circuit; But, shown in Fig. 5 A~5C, under the situation of the allocation position different circuits structure of reactor 2 or switching mechanism 4, also can realize same effect.
(execution mode 2)
Fig. 6 is the figure that the inverter of expression second execution mode drives the structure of device.
As shown in Figure 6; The inverter of second execution mode drives device and has the continuous-current plant of the structure identical with the continuous-current plant of execution mode shown in Figure 11, and has the inverter 11 of motor 10, drive motor 10 and be the inverter control part 12 that load drives with inverter 11.
In addition, drive the continuous-current plant of device for the inverter of execution mode 2, since identical with the continuous-current plant structure of execution mode 1, so omit explanation, only the continuous-current plant different portions with execution mode 1 is described.
The inverter of execution mode 2 drives device also to have: current limit value storage part 13, current limit value selection portion 14 and comparison portion 15.
The current limit value of a plurality of input currents of current limit value storage part 13 storages.
The condition that current limit value selection portion 14 is predetermined based on size and operating condition according to motor load, the current limit value of selection input current.
The indication of the rotary speed that reduces motor 10 is made being surpassed under the situation of the current limit value of being selected by current limit value selection portion 14 by the detected input current of current detecting part 8i by comparison portion 15 to inverter control part 12.
It is identical with execution mode 1 that the inverter of execution mode 2 drives device, can access: select the first current waveform pattern shown in Figure 2 also will become the operate condition that has the input current waveform (the second current waveform pattern) of the bimodality of recess at the peak phase of AC power 1 with selecting the second current waveform pattern shown in Fig. 3 A and will controlling from the input current that exchanges power supply 1 from the operate condition of the sinuous electric current of input current control becoming that exchanges power supply 1.In this execution mode, the current waveform selection 8d of portion is based on the current limit value decision operate condition of the input current of being selected by current limit value selection portion 14.
The current limit value of input current near the socket capacity limitation and till this socket capacity limitation existence need under the situation of operating condition of possibility of input current, the current waveform selection 8d of portion selects the first current waveform pattern in order to pay attention to power factor.
Otherwise when the running that the current limit value of the input current input current little and bigger than socket capacity can not flow through, the current waveform selection 8d of portion selects the second current waveform pattern for the ripple current that reduces smmothing capacitor 6.
In addition, the inverter of this execution mode 2 drives in the device, and the change speed setting of current limit value is a variation speed fully slowly of comparing input current.Thus, the possibility that produces vibration when the first current waveform pattern and the second current waveform mode switch reduces.Therefore, the current threshold of the current limit value of the benchmark when becoming the switch current waveform pattern needn't be provided with hysteresis especially.
As stated, the inverter of execution mode 2 drives device, and under the situation of maximum output by the operating condition of socket or the restriction of circuit breaker capacity of inverter 11, carrying out can be 1 sinuous input current control with power factor controlling.The maximum output ground that thus, can not reduce inverter 11 makes inverter driving device action.On the other hand, under the situation of current limit value lower operating condition of input current, the ripple current of smmothing capacitor 6 is reduced than socket capacity.Thus, can realize that smmothing capacitor 6 and even inverter drive the long lifetime and the miniaturization of device.
The inverter that in addition, can possess execution mode 2 drives device and constitutes air conditioner.
Fig. 7 representes to utilize the structure example of the air conditioner of above-mentioned control device for inverter.As shown in the drawing, air conditioner uses above-mentioned inverter to drive device (100), in addition, except that motor compressor 41, also has the kind of refrigeration cycle that is made up of indoor unit 52, outdoor unit 55 and cross valve 51.Indoor unit 52 is made up of indoor blower 53 and indoor heat converter 54, and in addition, outdoor unit 55 is made up of outdoor heat converter 56, outdoor draft fan 57 and expansion valve 58.
Motor compressor 41 is driven by motor 10, and motor 10 drives device 100 by inverter and drives.In the kind of refrigeration cycle as the refrigerant cycle of thermal medium.Cold-producing medium is by motor compressor 41 compressions; By outdoor heat converter 56 through carrying out heat exchange from the air-supply of outdoor draft fan 57 and outdoor air; In addition, by indoor heat converter 54 through carrying out heat exchange from the air-supply of indoor blower 53 and indoor air.
In this air conditioner, when heat supply running when hanging down the extraneous gas temperature and running beginning, input current becomes to the electric current of the maximum limit of socket capacity.But if consider between whole on-stream period, then the air conditioner time scale with the input current running lower than socket capacity such as when the ambient-temp-stable state is bigger.In addition, the situation that outdoor temperature (ambient temperature) is high etc. are even the operational situation that the heat load of smmothing capacitor 6 is also bigger under the low slightly operational situation of input current is more.Therefore, the inverter of execution mode 2 drives device and brings into play very large effect.
In addition; In between whole on-stream period; Under also can the be big situation in the ratio of the low operating condition of input current; The ripple current of smmothing capacitor 6 is flow through in setting can the 3rd further low than second current waveform pattern current waveform pattern, selects the 3rd current waveform pattern during than the lower loading condition of the reference current value of afore mentioned rules at input current.Thus, can further prolong the life-span of smmothing capacitor 6.
In addition, in the inverter driving device of execution mode 2,,, current limit value carries out the electric current restriction but also can being set the electric current that flows through motor 10 or inverter 11 to carry out the electric current restriction from AC power 1 input current.In this case, also can access same effect.
In addition; Inverter at execution mode 2 drives in the device; Also with execution mode 1 the same temperature detecting part 31 with testing environment temperature; Also can set the threshold value of the input current limits value that switches the first current waveform pattern and the second current waveform pattern the dull increase of for relative environment temperature.Thus, to the high state of the big environment temperature of the effect on service life of smmothing capacitor 6 time, selection can reduce by the second current waveform pattern of the ripple current of smmothing capacitor 6 easily.Therefore, can further prolong the life-span that smmothing capacitor 6 and even inverter drive device.
In addition, in execution mode 2, the control system of the switching mechanism 4 of continuous-current plant is made up of identical control part 8 with the control system of inverter 11, but also can be made up of other controlling organization that constitutes through microcomputer and DSP etc. respectively.In this case, also can access same effect.
(execution mode 3)
Fig. 8 A and Fig. 9 A are the figure of structure example of alternating voltage phase detecting circuit 9 of the continuous-current plant (inverter driving device) of expression execution mode 3.Through these alternating voltage phase detecting circuits 9 with after the voltage-phase operational part 8a that states constitute the voltage-phase test section of AC power 1.
Fig. 8 A be the expression can distinguish AC power 1 the generating positive and negative voltage phase place circuit structure one the example figure.Shown in Fig. 8 B, in this circuit structure, in the moment that the voltage wave height value of AC power 1 equates with the voltage V1 of regulation, the value of the output signal (binary signal) that alternating voltage phase detecting circuit 9 generates changes.That is, only when the phase place of the half-wave side of AC power 1 value of binary signal change.Thus, can differentiate positive and negative (0~180 degree and 180~360 degree) of the voltage of AC power 1.
Fig. 9 A be the expression can not distinguish AC power 1 the generating positive and negative voltage phase place circuit structure one the example figure.In this circuit structure, in the moment of the voltage V2 (>0) that equals to stipulate at the absolute value of the voltage wave height value of AC power 1, the value of the output signal (binary signal) of alternating voltage phase detecting circuit 9 changes.
In this circuit, can infer the voltage-phase from 0 to 180 degree to each half-wave of AC power 1.That is, no matter, can both infer voltage-phase at the positive and negative voltage-phase of AC power 1.The electric voltage exception of AC powers 1 such as power failure is promptly surveyed in the variation of value that thus, can be through binary signal.This circuit goes for need not distinguishing in the circuit construction of electric power of generating positive and negative voltage phase place of AC power 1.In addition, can carry out the control of switching mechanism 4 to each half-wave.
In arbitrary circuit of Fig. 8 A, Fig. 9 A; The moment of the central authorities between the variation of output signals point (edge) in continuous two alternating voltage phase detecting circuits 9; Be defined as 0 degree in phase place with the real zero cross point of AC power 1; To through phase place after the time that being equivalent to power cycle and be defined as 360 when spending, be equivalent to arbitrary phase place of 0,90,180,270 degree.Particularly, in the circuit of Fig. 8 A, the central authorities between trailing edge (edge, edge)-rising edge always are equivalent to voltage-phase 90 degree, in the circuit of Fig. 9 A, are equivalent to 90 degree or 270 degree.
Thus, the moment through asking for the central authorities between above-mentioned edge and the power cycle T of AC power 1, the voltage-phase (specifying like the back said) that can infer AC power 1.
In addition; Though have potential difference between the power line of AC power 1 and the control part 8 that constitutes by microcomputer etc.; But shown in Fig. 8 A or Fig. 9 A; Through in the circuit that uses photoelectrical coupler (photo coupler) 9d, obtaining insulation between the two, can constitute voltage-phase testing circuit 9 at an easy rate.
In addition, under the situation of using cheap general transistor output type photoelectrical coupler, produce the operating lag of tens of microsecond levels (order).In this case, when asking for the moment of the central authorities of continuous two edges between constantly through computing, as long as with the time that is equivalent to above-mentioned response time correspondingly in the front side operation result is revised.Thus, can improve the deduction precision of the voltage-phase of AC power 1.
Then, the phase place deduction method to the alternating voltage of the continuous-current plant (inverter driving device) of this execution mode describes.Figure 10 is a routine figure of the phase place method of deductioning of continuous-current plant or the inverter of this execution mode of the expression alternating voltage that drives device.In addition, in the following explanation, simple and describe as example with the situation that the situation of using High Speed ICs output type photoelectrical coupler etc. can be ignored above-mentioned response time in order to make explanation.
The continuous-current plant of this execution mode (inverter driving device) has the alternating voltage phase detecting circuit shown in Fig. 8 A.Voltage-phase operational part 8a (with reference to Fig. 1) in the control part 8 that constitutes by microcomputer etc.; Equal based on the voltage of AC power 1 two periodic quantities in moment of V1 the moment (A1, B1 and be equivalent to each power cycle after A2, B2), carry out the voltage-phase computing of AC power 1.
Below, concrete action is described.
At first, voltage-phase operational part 8a through detecting the time of (perhaps between B1-B2) between A1-A2 constantly, asks for the power cycle T of AC power 1 at moment B2.
When detecting the time of (between B1-B2) between A1-A2, if by each cycle of AC power 1 will by the trailing edge of alternating voltage phase detecting circuit 9 outputs constantly An (n is an integer) or rising edge constantly Bn (n is an integer) be stored in the interior RAM of microcomputer and carry out Difference Calculation.Perhaps, constantly during the edge of An or Bn, make timer begin action by the above-mentioned edge (edge) of voltage-phase testing circuit 9 output pressing power cycle, as long as the edge that behind an about power cycle, detects A constantly N+1Perhaps B N+1, utilize the count value of the above-mentioned timer that begins to move to ask for and get final product.
Then, voltage-phase operational part 8a will be equivalent to constantly A2 and constantly the moment P2 of the central authorities between B2 try to achieve through computing as the moment of voltage-phase 90 degree.
In addition, voltage-phase operational part 8a will be from the moment of the moment P2 that the tries to achieve moment P3 after through a power cycle T as next voltage-phase 90 degree.And; Voltage-phase operational part 8a moves at each power cycle repeatedly as follows; Promptly; Through P2 constantly with the voltage-phase X (degree) that will arrive any time R till the following moment B3 infers with following formula (formula 1) as time of each degree time of time (being power cycle T) 360 five equilibriums between P3 constantly.
(formula 1) X=90+ (R-P2)/360
(in above-mentioned deduction formula, under voltage-phase X surpasses 360 situation, for deducting 360 value.)
In the detection method of the voltage-phase of execution mode 3, with the supply frequency or the independent of power voltage ground of AC power 1, P1, P2 always equal voltage-phase 90 degree (under the situation of the circuit that uses Fig. 9 A, being equivalent to 90 degree or 270 degree) in theory constantly.Therefore, even supply frequency or power supply voltage variation, the middle position as the first or second current waveform pattern of the target (instruction current) of current feedback can not become 90 degree of peak value or the phase deviation of 270 degree from the voltage of AC power 1 yet.Therefore, always can access High Power Factor when selecting the first current waveform pattern, and always can the ripple current of capacitor suppressed lower when selecting the second current waveform pattern.
In addition, on average trying to achieve of the interval (time between A1-A2) that the cycle T of AC power can be through getting trailing edge and interval (time between B1-B2) of rising edge.In addition, the interval of trailing edge that also can be through getting continuous n periodic quantity average, promptly the time between A1-A2, the time between A2-A3 ..., A N-1On average trying to achieve of time between-An.Perhaps, the interval of rising edge that also can be through getting continuous n periodic quantity average, promptly the time between B1-B2, the time between B2-B3 ..., B N-1On average trying to achieve of time between-Bn.Perhaps, average on average the trying to achieve at the interval of the rising edge of the average and continuous n periodic quantity at the interval of the trailing edge through getting continuous n periodic quantity.
In addition, utilize the continuous-current plant (inverter driving device) of execution mode 3 can equally with execution mode 2 constitute air conditioner.
(execution mode 4)
The inverter of execution mode 4 drives device to have: the continuous-current plant that execution mode 1 or 3 is put down in writing, the inverter controlling organization of driven load of inverse, do not judge the approximate size of load through the driving frequency of inverter through input current.And, when carrying out the selection of current waveform pattern, through switching with the magnitude relationship of the inverter frequency of stipulating.Particularly; Inverter drives the current waveform selection 8d of portion of device; Select the first current waveform pattern in the driving frequency of inverter control part 12 under than the big situation of the assigned frequency that is predetermined, under according to the current limit value of the operating condition decision of the inverter load situation littler, select the second current waveform pattern than predetermined electric current threshold value.
Drive in the device at the inverter of execution mode 4, when the switching of carrying out between the first current waveform pattern and the second current waveform pattern, input current is changed, power factor is changed according to the difference of selected current waveform pattern.But the frequency (electric frequency) that inverter drives is almost constant.Therefore, needn't in the threshold value of the frequency of the selection of carrying out the current waveform pattern, switching, hysteresis be set, confirm that the design (frequency of regulation) of the parameter of switching condition becomes simpler.
In addition, utilize the continuous-current plant (inverter driving device) of execution mode 4 can equally with execution mode 2 constitute air conditioner.
(summary)
In the first embodiment, provide a kind of in the time will converting direct voltage into, carry out the continuous-current plant of short circuit open circuit via reactor 2 through 4 pairs of AC powers of switching mechanism 1 from the alternating voltage that exchanges power supply 1.This continuous-current plant has: current waveform storage part 8c; It stores a plurality of current waveform patterns; It is the waveform pattern that the phase place of peak value has recess with having voltage in AC power 1 that these a plurality of current waveform patterns comprise the roughly sinuous first current waveform pattern, and perhaps making with the voltage of AC power 1 is the second current waveform pattern of arbitrary characteristic of the smooth waveform pattern of the corresponding part of the phase place of peak value; The current waveform selection 8d of portion, it selects a current waveform pattern according to load from current waveform storage part 8c; And the control part (control part in the respective rights requirement 1; Constitute by the current-order generation 8e of portion, current control division 8f, the pwm signal generation 8h of portion, the carrier wave generation 8g of portion and voltage control division 8b); It is controlled switching mechanism 4, so that become the current waveform that has with the proportional amplitude of being selected by the current waveform selection 8d of portion of current waveform pattern from the current waveform of the input current of AC power 1.
According to this execution mode, can switch the current waveform pattern of utilizing according to load 7.For example paying the utmost attention under the situation of power factor, can power factor roughly be controlled to be 1 through selecting the first current waveform pattern.Therewith relatively, under the situation of paying the utmost attention to the ripple current that reduces smmothing capacitor 6, can reduce the ripple current that flows through smmothing capacitor 6 through selecting the second current waveform pattern.Therefore, needn't reduce the maximum output of continuous-current plant, and irrespectively can the containing ratio of supply harmonic be remained on below the certain value with the height of AC supply voltage.In addition, can realize the long lifetime and the miniaturization of smmothing capacitor 6.
In second execution mode; Continuous-current plant also has voltage-phase test section (the voltage-phase test section of respective rights requirement 2 of the voltage-phase that detects AC power 1; Constitute with voltage-phase operational part 8a by alternating voltage phase detecting circuit 9); Control part (respective rights requires the control part in 2, is made up of the current-order generation 8e of portion, current control division 8f, the pwm signal generation 8h of portion, the carrier wave generation 8g of portion and voltage control division 8) makes the cycle and the voltage-phase and synchronous through the cycle and the voltage-phase of the detected AC power 1 of voltage-phase test section of the first and second current waveform patterns.
According to this execution mode, can chase after the Phase synchronization that makes the voltage and the input current waveform of AC power 1 from supply frequency arbitrarily.Therefore, even the supply frequency of AC power 1 change also can always keep High Power Factor, and can be always the ripple current of smmothing capacitor 6 be remained on low state.
In the 3rd execution mode; On the basis of first execution mode or second execution mode; (respective rights requires 3 voltage-phase test section to the voltage-phase test section; Constitute with voltage-phase operational part 8a by alternating voltage phase detecting circuit 9); The value of the voltage of AC power 1 or its absolute value and regulation compared generate binary signal,, try to achieve the cycle of AC power with the mean value at the interval of the interval of the interval of the interval of the rising edge of the above-mentioned binary signal that generates, trailing edge or rising edge and trailing edge.In addition; Rising edge and the computing in the central authorities moment between trailing edge and the cycle of the AC power 1 of being tried to achieve of voltage-phase test section (voltage-phase testing circuit 9 and voltage-phase operational part 8a) through using continuous binary signal inferred the voltage-phase of AC power 1.
In this execution mode; Because the deduction of the voltage-phase of AC power 1 and the influence that the operation result in cycle does not receive the voltage swing of AC power 1; Even so power supply voltage variation, voltage infers that phase place can not squint yet, and can the ripple current of smmothing capacitor 6 kept lower.
In the 4th execution mode, on the basis of the 3rd execution mode, voltage-phase test section (voltage-phase testing circuit 9 and voltage-phase operational part 8a) is made up of the circuit that uses photoelectrical coupler 9d.
According to this execution mode, can carry out the insulation of 8 of AC power 1 and control parts by simple circuit configuration.Therefore, can become cheap structure.
In the 5th execution mode, on the basis of first or second execution mode, the second current waveform pattern is by constituting with the sine wave of AC power 1 same frequency and the composite wave of triple-frequency harmonics thereof.
According to this execution mode, particularly do not export basically to be the representative and the odd harmonics composition of high reps more to electric power system burden bigger five times and the seventh harmonic, restriction also can guarantee to design fully enough and to spare for supply harmonic.
In the 6th execution mode, on the basis of first or second execution mode, the current waveform selection 8d of portion selects the first current waveform pattern under the big situation of input current, under the little situation of input current, select the second current waveform pattern.In addition, the threshold value to the input current that carries out the first current waveform pattern and the second current waveform mode switch is provided with hysteresis.
According to this execution mode, the vibration of the power factor difference in the time of can positively preventing to result from the current waveform mode switch through simple control.
In the 7th execution mode; On the basis of the 6th execution mode; Continuous-current plant also has the temperature detecting part 31 that detects environment temperature, and environment temperature is high more, carries out the value that the threshold value of the input current of the first current waveform pattern and the second current waveform mode switch is set at bigger and bigger.
According to this execution mode, when the temperature rising of smmothing capacitor 6 is moved to the big high temperature of the influence in life-span, can preferentially reduce the ripple current of smmothing capacitor 6, further prolong the life-span of smmothing capacitor 6.
In the 8th execution mode, in the inverter driving device of inverter control load 7, has the continuous-current plant of first execution mode or second execution mode as an execution mode.
In the load change scope of usually inverter load greatly but when not needing the load of so high power factor, adopt the second current waveform pattern.Thus, can reduce the ripple current of smmothing capacitor 6, prolong the life-span of smmothing capacitor 6.
Perhaps, in the 8th execution mode, in the inverter driving device of inverter control load 7, has the continuous-current plant of the 6th execution mode as an execution mode.
, adopts the big but input current of the load change scope of usually inverter load the first current waveform pattern when being big heavy duty.Thus, can access High Power Factor, can suppress the maximum current that inverter drives in the device lower.On the other hand, when load from the low slightly underload of input current becomes, adopt the second current waveform pattern.Thus, can suppress the ripple current of smmothing capacitor 6, prolong the life-span of smmothing capacitor 6.
In the 9th execution mode, provide a kind of inverter to drive device, it has: load is the continuous-current plant of first or second execution mode of inverter load; With inverter 11 is controlled so that be the inverter control part 12 below the current limit value that is predetermined according to the operating condition of inverter load from the input current of AC power 1.Inverter drives the current waveform selection 8d of portion of device; Under according to the current limit value of the operating condition of the inverter load decision situation bigger, select the first current waveform pattern, under according to the current limit value of the operating condition decision of the inverter load situation littler, select the second current waveform pattern than predetermined electric current threshold value than predetermined electric current threshold value.
According to this execution mode, big at the current limit value of input current, have in the running under the situation that big input current flows through, select the first current waveform pattern.Thus, can make input current waveform sinusoidal wave for roughly, be 1 with power factor controlling.On the other hand, identical with first mode when selecting the second current waveform model selection, do not use the voltage waveform information of AC power and use storage in advance current waveform so that the pulsation of input electric power tail off.Thus, can reduce the ripple current of smmothing capacitor 6.In addition, can irrespectively the containing ratio of supply harmonic be remained on below the certain value, can prevent the decline of the maximum output of continuous-current plant, and can suppress the ripple current that flows through smmothing capacitor 6 lower with the height of AC supply voltage.
In the tenth execution mode, provide that a kind of to have load be that the inverter of inverter control part 12 of continuous-current plant and control inverter load of first or second execution mode of inverter load drives device.This inverter drives the current waveform selection 8d of portion of device; Select the first current waveform pattern in the driving frequency of inverter control part 12 under than the big situation of the assigned frequency that is predetermined, under according to the current limit value of the operating condition decision of the inverter load situation littler, select the second current waveform pattern than predetermined electric current threshold value.
According to this execution mode, even power factor changes when the current waveform mode switch, the driving frequency of inverter control part 12 is also constant.Therefore, needn't worry the vibration between the current waveform pattern, it is easy that the design of the frequency of switch current waveform pattern becomes.
In the 11 execution mode, a kind of air conditioner with continuous-current plant of first or second execution mode is provided.
Generally speaking, in air conditioner, when removing the heat supply running when hanging down the extraneous gas temperature or turning round beginning; Input current during running is lower than socket capacity; In addition, in the whole duration of runs of air conditioner, like this input current so not high during proportion bigger.Therefore, can be with to set longlyer during the second current waveform mode operation than miscellaneous equipment.Therefore, can more effectively reduce the heating of smmothing capacitor 6.In addition, can further prolong the life-span of product.
In the 12 execution mode, provide a kind of inverter that possesses the 8th execution mode of continuous-current plant to drive the air conditioner of device with first, second execution mode as a mode.
According to this execution mode, identical with the 11 execution mode, can be with to set longlyer during the second current waveform mode operation than miscellaneous equipment.Therefore, can further prolong the life-span of smmothing capacitor 6 and product.
In the 12 execution mode, provide a kind of inverter that possesses the 8th execution mode of continuous-current plant to drive the air conditioner of device with the 6th execution mode as an execution mode.In this execution mode, the size of actual input current is judged the current waveform pattern and is switched with when running.
According to this execution mode, through the maximum capacity of socket capacity limit product, the input current condition of High Power Factor can be used the first current waveform pattern as required.Therefore, can further prolong the life-span of smmothing capacitor 6 and even product.
In the 12 execution mode, provide a kind of inverter to drive the air conditioner of device with the 9th execution mode as an execution mode.And only the limits value at the input current that is predetermined according to loading condition is big, exists under the situation of the possibility that big input current flows through, and adopts first waveform pattern.
According to this execution mode, the vibration that power factor change causes in the time of needn't worrying by the current waveform mode switch.Therefore, the enough simple switching controls of ability prolong the life-span of smmothing capacitor 6 and product.
In the 12 execution mode, provide a kind of inverter to drive the air conditioner of device with the tenth execution mode as an execution mode.
Generally speaking, only under the high situation of the driving frequency of the big inverter 11 of input current, use the first current waveform pattern.Thus, the 12 execution mode that drives device with the inverter with the 9th execution mode is identical, the vibration that the power factor change in the time of needn't worrying by the current waveform mode switch causes.Therefore, the enough simple switching controls of ability prolong the life-span of smmothing capacitor 6 and even product.
Utilizability on the industry
As stated, in the continuous-current plant of this execution mode, the power factor during with maximum load remains 1.Thus, account for its operate time during more than half in~during underload, can not reduce the ripple current that the maximum output ground of supplying with to load reduces smmothing capacitor.Therefore, can be applicable to refrigerator, washing machine, Teat pump boiler etc. in case will convert direct voltage into just to the purposes of nearly all household electrical appliances of load supply capability from the alternating voltage that exchanges power supply.
The reference numeral explanation
1 AC power
2 reactors
4 switching mechanisms
6 smmothing capacitors
7 loads
8a voltage-phase operational part test section
8c current waveform storage part
8d current waveform selection portion
9 alternating voltage phase detecting circuit test sections
11 inverters
12 inverter control parts

Claims (12)

1. a continuous-current plant will convert direct voltage into from the alternating voltage that exchanges power supply, it is characterized in that, comprise:
Switching mechanism, it carries out the short circuit open circuit via reactor to said AC power;
The current waveform storage part; It stores a plurality of current waveform patterns; These a plurality of current waveform patterns comprise: roughly sinuous first current waveform pattern and the phase place that has voltage in said AC power and become peak value have the waveform pattern of recess or make the second current waveform pattern that becomes any characteristic of the smooth waveform pattern of the corresponding part of the phase place of peak value with the voltage of said AC power;
Current waveform selection portion, it selects a current waveform pattern according to load from said current waveform storage part; With
Control part, it is controlled said switching mechanism, so that become the current waveform that has with the proportional amplitude of being selected by said current waveform selection portion of current waveform pattern from the current waveform of the input current of said AC power.
2. continuous-current plant as claimed in claim 1 is characterized in that:
The voltage-phase test section that also has the voltage-phase that detects said AC power,
Said control part makes the cycle and the voltage-phase and synchronous by the cycle and the voltage-phase of the detected AC power of said voltage-phase test section of the said first and second current waveform patterns.
3. according to claim 1 or claim 2 continuous-current plant is characterized in that:
Said voltage-phase test section compares the value of the voltage of said AC power or its absolute value and regulation and generates binary signal,
Use the mean value at interval of interval and trailing edge of interval or rising edge of interval, the trailing edge of the rising edge of the said binary signal that is generated, try to achieve the cycle of AC power,
Through the rising edge and the computing in the central authorities' moment between the trailing edge and the cycle of the said AC power of being tried to achieve of using continuous binary signal, the voltage-phase of AC power is inferred.
4. continuous-current plant as claimed in claim 3 is characterized in that:
Said voltage-phase test section is made up of the circuit that uses photoelectrical coupler.
5. according to claim 1 or claim 2 continuous-current plant is characterized in that:
The said second current waveform pattern is by constituting with the sine wave of the same frequency of said AC power and the composite wave of its triple-frequency harmonics.
6. according to claim 1 or claim 2 continuous-current plant is characterized in that:
The said first current waveform pattern is selected by said current waveform selection portion under the big situation of input current, under the little situation of input current, select the said second current waveform pattern,
Threshold value to the input current of the switching of carrying out said first current waveform pattern and the said second current waveform pattern is provided with hysteresis.
7. continuous-current plant as claimed in claim 6 is characterized in that:
Also have the temperature testing organization that detects environment temperature,
The threshold value of said input current, environment temperature be high more to be set to big more value.
8. an inverter drives device, it is characterized in that, comprising:
Load is each described continuous-current plant in the claim 1,2,6 of inverter load; With
Control the inverter control part of said inverter load.
9. an inverter drives device; It has: load is the claim 1 or the 2 described continuous-current plants of inverter load; With inverter is controlled so that from the inverter control part of input current below the current limit value that the operating condition according to said inverter load is predetermined of said AC power, this inverter drives device and is characterised in that:
Said current waveform selection portion; Under according to the current limit value of the operating condition of the said inverter load decision situation bigger, select the said first current waveform pattern, selecting the said second current waveform pattern under than the little situation of said predetermined electric current threshold value according to the said current limit value of the operating condition decision of said inverter load than predetermined electric current threshold value.
10. an inverter drives device, and it has claim 1 or 2 described continuous-current plants and the inverter control part of controlling said inverter load that load is the inverter load, and this inverter drives device and is characterised in that:
Said current waveform selection portion; Select the said first current waveform pattern in the driving frequency of said inverter control part under than the big situation of the assigned frequency that is predetermined, selecting the said second current waveform pattern under than the little situation of said predetermined electric current threshold value according to the current limit value of the operating condition decision of said inverter load.
11. an air conditioner is characterized in that:
Have said claim 1 or 2 described continuous-current plants.
12. an air conditioner is characterized in that:
Has each described inverter driving device in the said claim 8~10.
CN201080015686.1A 2009-04-08 2010-04-05 DC power source device and inverter device and air-conditioner using these Active CN102388528B (en)

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