CN105991045A - Control method and control device for rectifier circuits of three-phase uninterruptible power supply - Google Patents
Control method and control device for rectifier circuits of three-phase uninterruptible power supply Download PDFInfo
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Abstract
The invention provides a control method and a control device for the rectifier circuits of a three-phase uninterruptible power supply. Rectifier circuits comprise first, second and third rectifier circuits, and the first, second and third rectifier circuits respectively comprise first, second and third input inductors which are electrically connected with three-power alternating-current power. The control method comprises the following steps: (1) respectively measuring a first input current, a second input current and a third input current of the first, second and third input inductors; (2) comparing the first input current, the second input current and the third input current respectively with a predetermined percentage of the rated input current of a three-phase uninterruptible power supply to get a first enable signal, a second enable signal and a third enable signal; and (3) making one or more of the first rectifier circuit, the second rectifier circuit and the third rectifier circuit work according to the first enable signal, the second enable signal and the third enable signal. Through the control method of the invention, the efficiency of the rectifier circuits of a three-phase uninterruptible power supply is improved.
Description
Technical field
The present invention relates to the control method of the rectification circuit of uninterrupted power source, be specifically related to three-phase uninterrupted
The control method of the rectification circuit of power supply and control device.
Background technology
Three-phase uninterrupted power supply is to apply a kind of uninterrupted power source widely at present.Fig. 1 is existing
The circuit diagram of the rectification circuit in a kind of three-phase uninterrupted power supply in technology.In mains-supplied pattern,
Needed for pulse-width modulation signal generation unit 40 provides directly to rectification circuit 10,20 and 30 respectively
Pulse-width signal PWM1, PWM1 ', PWM2, PWM2 ', PWM3 and PWM3 ', because of
And rectification circuit 10,20 and 30 works and is inputted the three-phase alternating current (Fig. 1 is not shown) of end simultaneously
Carry out rectification, and at dc bus (the positive direct-current bus 41 shown in Fig. 1 being connected with its outfan
With negative dc bus 42) on obtain required voltage and power output.Due to rectification circuit 10,20
Loss, the especially inductance L1 in rectification circuit 10, switching tube is there is with the electronic device in 30
Q1 and Q1 ', the inductance L2 in rectification circuit 20, switching tube Q2 and Q2 ', and rectification circuit
Inductance L3 in 30, switching tube Q3 and Q3 ', so that the efficiency of three-phase uninterrupted power supply reduces.
Research finds, for three-phase uninterrupted power supply known to a rated output power, when it is defeated
Go out the load factor (i.e. actual negative carrying capacity is divided by rated weight capacity) of the load (Fig. 1 is not shown) that end connects
During reduction, the efficiency of three-phase uninterrupted power supply also reduces.Such as, it is 20KW for rated output power
Three-phase uninterrupted power supply, when load factor is 50%, its efficiency is 94%；When load factor is reduced to
When 24%, its efficiency is reduced to 92%.
In actual applications, the load connected due to the outfan of three-phase uninterrupted power supply is it may happen that become
Changing, when load capacity changes and is far below rated weight capacity, existing control method can reduce effect
Rate.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to improve the rectification circuit of three-phase uninterrupted power supply
Efficiency.
An embodiment provides the control of the rectification circuit of a kind of three-phase uninterrupted power supply
Method, described rectification circuit includes the first rectification circuit, the second rectification circuit and the 3rd rectification circuit,
Described first rectification circuit, the second rectification circuit and the 3rd rectification circuit include and three-phase alternating current respectively
First input inductance of electrical connection, the second input inductance and the 3rd input inductance, described control method bag
Include the following step:
1) described first input inductance, the second input inductance and the of the 3rd input inductance are measured respectively
One input current, the second input current and the 3rd input current；
2) by described first input current, the second input current and the 3rd input current respectively with described
The predetermined percentage of the specified input current of three-phase uninterrupted power supply compares, it is thus achieved that first enables letter
Number, second enable signal and the 3rd enable signal；
3) enable signal, the second enable signal and the 3rd enable signal according to described first, control institute
State the one or more work in the first rectification circuit, the second rectification circuit and the 3rd rectification circuit.
Preferably, in described step 3) in, will be used for controlling described first rectification circuit, second whole
The pulse-width signal of current circuit and the work of the 3rd rectification circuit enable with described first respectively signal, the
Two enable signals and the 3rd enable signal and carry out logical operations, according to the output control of described logical operations
One or more work in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit.
Preferably, described logical operations is and computing.
Preferably, in described step 2) in, when described first input current, the second input current and
When 3rd input current is both less than the first predetermined percentage of described specified input current, obtain for controlling
Make two in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit idle
One enables signal, the second enable signal and the 3rd enable signal.
Preferably, in described step 2) in, when described first input current, the second input current and
3rd input current is all not less than the first predetermined percentage and the both less than institute of described specified input current
When stating the second predetermined percentage of specified input current, obtain for control described first rectification circuit,
In second rectification circuit and the 3rd rectification circuit one idle first enables signal, the second enable
Signal and the 3rd enables signal.
Preferably, in described step 2) in, when described first input current, the second input current and
In 3rd input current both equal to zero, another one is not less than the of described specified input current
Three predetermined percentage and during less than four predetermined percentage of described specified input current, obtain for controlling
Make in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit idle
One enables signal, the second enable signal and the 3rd enable signal.
Preferably, in described step 2) in, when described first input current, the second input current and
In 3rd input current one is equal to zero, and two other is both less than the of described specified input current
During five predetermined percentage, obtain for controlling described first rectification circuit, the second rectification circuit and the 3rd
In rectification circuit two idle first enable signal, the second enable signal and the 3rd enables signal.
One embodiment of the present of invention additionally provides the control of the rectification circuit of a kind of three-phase uninterrupted power supply
Device processed, described rectification circuit includes the first rectification circuit, the second rectification circuit and the 3rd rectification circuit,
Described first rectification circuit, the second rectification circuit and the 3rd rectification circuit include and three-phase alternating current respectively
First input inductance of electrical connection, the second input inductance and the 3rd input inductance, described control device bag
Include:
Current measuring unit, is used for measuring described first input inductance, the second input inductance and the 3rd defeated
Enter the first input current of inductance, the second input current and the 3rd input current；
Comparing unit, for by described first input current, the second input current and the 3rd input current
Predetermined percentage with the specified input current of described three-phase uninterrupted power supply compares respectively, it is thus achieved that
First enables signal, the second enable signal and the 3rd enable signal；And
Control device, for enabling signal, the second enable signal and the 3rd enable letter according to described first
Number, control or many in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit
Individual work.
Preferably, described control device is logical calculation device, described first whole for being used for controlling
The pulse-width signal of current circuit, the second rectification circuit and the work of the 3rd rectification circuit is respectively with described the
One enables signal, the second enable signal and the 3rd enable signal carries out logical operations, according to described logic
In first rectification circuit, the second rectification circuit and the 3rd rectification circuit described in the output control of computing one
Individual or multiple work.
Preferably, described logical calculation device is and arithmetic unit.
Preferably, it is both less than when described first input current, the second input current and the 3rd input current
During the first predetermined percentage of described specified input current, the output of described enable signal generation device is used for
Control two in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit idle
First enables signal, the second enable signal and the 3rd enable signal.
Preferably, the least when described first input current, the second input current and the 3rd input current
The first predetermined percentage and the of the most described specified input current in described specified input current
During two predetermined percentage, the output of described enable signal generation device be used for controlling described first rectification circuit,
In second rectification circuit and the 3rd rectification circuit one idle first enables signal, the second enable
Signal and the 3rd enables signal.
Preferably, as two in described first input current, the second input current and the 3rd input current
Individual being equal to zero, another one is not less than the 3rd predetermined percentage of described specified input current and is less than
During four predetermined percentage of described specified input current, the output of described enable signal generation device is used for
Control in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit idle
First enables signal, the second enable signal and the 3rd enable signal.
Preferably, as in described first input current, the second input current and the 3rd input current
Individual it is equal to zero, and when two other is both less than five predetermined percentage of described specified input current, institute
State enable signal generation device output for controlling described first rectification circuit, the second rectification circuit and the
In three rectification circuits two idle first enable signal, the second enable signal and the 3rd enables letter
Number.
When three-phase uninterrupted power output end connects the load having low-load rate, the controlling party of the present invention
Method improves its efficiency in the case of not increasing response time.
Accompanying drawing explanation
Embodiments of the present invention is further illustrated referring to the drawings, wherein:
Fig. 1 is the circuit diagram of the rectification circuit in a kind of three-phase uninterrupted power supply of the prior art.
Fig. 2 is the circuit diagram of the rectification circuit according to presently preferred embodiments of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage are clearer, below in conjunction with accompanying drawing
By specific embodiment, the present invention is described in more detail.
The present inventor finds through research, to known to a rated output power and nominal input voltage
For three-phase uninterrupted power supply (as a example by Fig. 1), when load capacity changes, inductance L1,
Electric current in L2 and L3 also can correspondingly change.Further, the present inventors have additionally discovered that, by measuring electricity
Input current I in sense L11Input current I in (virtual value), inductance L22(virtual value) and
Input current I in inductance L33(virtual value), and with specified input current virtual value Ir(it is equal to
Rated output power/(3* nominal input voltage * overall efficiency)) predetermined percentage compare, can
To judge size and the change of load capacity.Wherein overall efficiency is UPS efficiency.
Therefore, the control method of the present invention according to the size of the input current in inductance L1, L2 and L3,
Defeated by the power needed for providing of one or two work in control rectification circuit 10,20 and 30
Go out, do not have the inductance in harness rectification circuit and switching tube to there will be no loss, thus improve efficiency.
Below referring still to Fig. 1, the control method of the present invention is described in detail.
First electric current I is measured1、I2And I3.According to the result measured, there is following several situation:
The first situation (1): 0 ＜ I1＜ Ir× 25%, 0 ＜ I2＜ Ir× 25%, 0 ＜ I3＜ Ir× 25%:
This current measurement result shows that three rectification circuits 10,20 and 30 all work and provide power defeated
Go out, and load factor is less than 25%.Due to the maximum output when normal table works of each rectification circuit
The rated output power of about 1/3rd, i.e. one rectification circuit work can be 33% to load factor
Load provide needed for power.In order to improve efficiency, reality only needs rectification circuit 10,20 and 30
In a job (i.e. rectification circuit is switched to the first mode of operation).
According to the current measurement result of the first situation (1), control rectification circuit 10,20 and 30
Work in one of following three kinds of modes.
(11) control rectification circuit 10 work and power output is provided, and control rectification circuit 20 and 30
Not working, controlling result is: 0 ＜ I1＜ Ir× 75%, I2=0, I3=0；Or
(12) control rectification circuit 20 work and power output is provided, and control rectification circuit 10 and 30
Not working, controlling result is: I1=0,0 ＜ I2＜ Ir× 75%, I3=0；Or
(13) control rectification circuit 30 work and power output is provided, and control rectification circuit 10 and 20
Not working, controlling result is: I1=0, I2=0,0 ＜ I3＜ Ir× 75%.
The second situation (2): Ir× 25%≤I1＜ Ir× 50%, Ir× 25%≤I2＜ Ir× 50%, Ir× 25%≤
I3＜ Ir× 50%:
This current measurement result shows that rectification circuit 10,20 and 30 all works provides power output, and
Load factor is between 25%～50%.Therefore, in order to improve efficiency, reality only need rectification circuit 10,
In 20 and 30 two work and get final product (i.e. rectification circuit is switched to the second mode of operation).
According to the current measurement result of the second situation (2), control rectification circuit 10,20 and 30
Work in one of following three kinds of modes.
(21) control the power output needed for rectification circuit 10 and 20 work provides, and control rectification
Circuit 30 does not works, and controls result and is: Ir× 37.5%≤I1＜ Ir× 75%, Ir× 37.5%≤I2＜ Ir× 75%,
I3=0；Or
(22) control rectification circuit 10 and 30 work, and control rectification circuit 20 does not works, control
Result processed is: Ir× 37.5%≤I1＜ Ir× 75%, I2=0, Ir× 37.5%≤I3＜ Ir× 75%；Or
(23) control rectification circuit 20 and 30 work, and control rectification circuit 10 does not works, control
Result processed is: I1=0, Ir× 37.5%≤I2＜ Ir× 75%, Ir× 37.5%≤I3＜ Ir× 75%.
The third situation (3): Ir× 50%≤I1,Ir× 50%≤I2,Ir× 50%≤I3:
This current measurement result shows all to work rectification circuit 10,20 and 30, and (i.e. rectification circuit is in
The third mode of operation) power output is provided, and load factor is more than 50%.So that three-phase not between
Power-off source steady operation, it is not necessary to adjust the mode of operation of rectification circuit 10,20 and 30.
According to the control method of the present invention, need the amplitude of variation according to actual loading rate and frequency, no
Measure electric current I disconnectedly1、I2And I3With adjustment duty.
When a job provides power output in rectification circuit 10,20 and 30, again measure electric current
I1、I2And I3, it may appear that following several situations:
(111)Ir× 75%≤I1＜ Ir× 150%, I2=0, I3=0, this current detecting result shows: whole
Current circuit 10 work provides power output, and load factor increases between 25%～50%.In order to make
Obtain the work of three-phase uninterrupted power good and improve efficiency, it is therefore desirable to rectification circuit 10,20 and 30
In two work.
(121)I1=0, Ir× 75%≤I2＜ Ir× 150%, I3=0, current detecting result shows: rectification
Circuit 20 work provides power output, and load factor increases between 25%～50%, it is therefore desirable to
Two work in rectification circuit 10,20 and 30.
(131)I1=0, I2=0, Ir× 75%≤I3＜ Ir× 150%, current detecting result shows: rectification
Circuit 30 work provides power output, and load factor increases between 25%～50%, it is therefore desirable to
Two work in rectification circuit 10,20 and 30.
(112)Ir× 150%≤I1, I2=0, I3=0, current detecting result shows: rectification circuit 10
Work provides power output, and load factor increases to more than 50%, it is therefore desirable to rectification circuit 10,20
All work with 30.
(122)I1=0, Ir× 150%≤I2, I3=0, current detecting result shows: rectification circuit 20
Work provides power output, and load factor increases to more than 50%, it is therefore desirable to rectification circuit 10,20
All work with 30.
(132)I1=0, I2=0, Ir× 150%≤I3, current detecting result shows: rectification circuit 30
Work provides power output, and load factor increases to more than 50%, it is therefore desirable to rectification circuit 10,20
All work with 30.
Equally, when two work in rectification circuit 10,20 and 30 provide power output, again
Measure electric current I1、I2And I3, it may appear that following several situations:
(211) 0 ＜ I1＜ Ir× 37.5%, 0 ＜ I2＜ Ir× 37.5%, I3=0, this current detecting result table
Bright: rectification circuit 10 and 20 work provides power output, and load factor decreases below 25%, because of
This only needs one in rectification circuit 10,20 and 30 to work.
(221) 0 ＜ I1＜ Ir× 37.5%, I2=0,0 ＜ I3＜ Ir× 37.5%, this current detecting result table
Bright: rectification circuit 10 and 30 work provides power output, and load factor decreases below 25%.Cause
This, need one controlled in rectification circuit 10,20 and 30 to work.
(231)I1=0,0 ＜ I2＜ Ir× 37.5%, 0 ＜ I3＜ Ir× 37.5%, current detecting result shows:
Rectification circuit 20 and 30 work provides power output, and load factor decreases below 25%.Therefore,
One controlled in rectification circuit 10,20 and 30 is needed to work.
(212)Ir× 75%≤I1, Ir× 75%≤I2, I3=0, this current detecting result shows: rectification
Circuit 10 and 20 work provides power output, and load factor increases to more than 50%, it is therefore desirable to control
Rectification circuit 10,20 and 30 processed all works.
(222)Ir× 75%≤I1, I2=0, Ir× 75%≤I3, this current detecting result shows: rectification
Circuit 10 and 30 work provides power output, and load factor increases to more than 50%, it is therefore desirable to control
Rectification circuit 10,20 and 30 processed all works.
(232)I1=0, Ir× 75%≤I2, Ir× 75%≤I3, this current detecting result shows: rectification
Circuit 20 and 30 work provides power output, and load factor increases to more than 50%, it is therefore desirable to control
Rectification circuit 10,20 and 30 processed all works.
According to conclusion above, as the current value I measured1、I2、I3Meet any one feelings following
During condition:
0 ＜ I1＜ Ir× 25%, 0 ＜ I2＜ Ir× 25%, 0 ＜ I3＜ Ir× 25%；Or
0 ＜ I1＜ Ir× 37.5%, 0 ＜ I2＜ Ir× 37.5%, I3=0；Or
0 ＜ I1＜ Ir× 37.5%, I2=0,0 ＜ I3＜ Ir× 37.5%；Or
I1=0,0 ＜ I2＜ Ir× 37.5%, 0 ＜ I3＜ Ir× 37.5%；
Any one work in the control method rectification circuit to be controlled 10,20 and 30 of the present invention provides
Power exports.
As the current value I measured1、I2、I3When meeting any one situation following:
Ir× 25%≤I1＜ Ir× 50%, Ir× 25%≤I2＜ Ir× 50%, Ir× 25%≤I3＜ Ir× 50%；Or
Ir× 75%≤I1＜ Ir× 150%, I2=0, I3=0；Or
I1=0, Ir× 75%≤I2＜ Ir× 150%, I3=0；Or
I1=0, I2=0, Ir× 75%≤I3＜ Ir× 150%；
Any two work in the control method rectification circuit to be controlled 10,20 and 30 of the present invention carries
Export for power.
Use the control method of the present invention, control one or two in rectification circuit 10,20 and 30
Work to provide power output, there will be no damage hence without the electronic device in the rectification circuit of work
Consumption, thus improve efficiency.
As the current value I measured1、I2、I3When meeting any one situation following:
Ir× 50%≤I1,Ir× 50%≤I2,Ir× 50%≤I3；Or
Ir× 150%≤I1, I2=0, I3=0；Or
I1=0, Ir× 150%≤I2, I3=0；Or
I1=0, I2=0, Ir× 150%≤I3；Or Ir× 75%≤I1, Ir× 75%≤I2, I3=0；Or
Ir× 75%≤I1, I2=0, Ir× 75%≤I3；Or
I1=0, Ir× 75%≤I2, Ir× 75%≤I3；
The control method rectification circuit to be controlled 10,20 and 30 of the present invention all works provides power output.
According to one embodiment of present invention, any one in rectification circuit 10,20 and 30 to be controlled
Work, can be realized by the duty controlling the switching tube in this rectification circuit.
According to still another embodiment of the invention, can be by controlling the arteries and veins of the switching tube on rectification circuit
Wide modulated signal PWM1, PWM1 ', PWM2, PWM2 ', the presence or absence of PWM3 and PWM3 '
Control switching tube Q1, Q1 ', Q2, Q2 ', the duty of Q3 and Q3 '.
In the above embodiments, the percentage ratio that inventor is the most above-mentioned is respectively defined as 25%, 50%,
75%, 150%, 37.5%, but for the person of ordinary skill of the art, it is also possible to according to
Demand is by electric current I1、I2、I3Respectively with specified input current virtual value IrOther predetermined percentage carry out
Relatively, such as above-mentioned percentage ratio 25%, 50%, 75%, 150%, 37.5% can be replaced respectively
It is changed to 33%, 66%, 100%, 200%, 50%.
According to other embodiments of the invention, above-mentioned control method is not limited to control three shown in Fig. 1
Rectification circuit in phase uninterrupted power source, it is also possible to being used for controlling rectification circuit 10,20 and 30 is three
The situation of level circuit.
According to one embodiment of present invention, the control device of a kind of three-phase uninterrupted power supply is additionally provided.
As in figure 2 it is shown, this control device is in addition to the element comprising Fig. 1, also include the first current measurement
Device the 210, second current measuring device the 220, the 3rd current measuring device 230, comparison means 201
And with arithmetic unit 202.
First current measuring device 210 measures the input current I in inductance L11(virtual value), second
Current measuring device 220 measures the input current I in inductance L22(virtual value), the 3rd current measurement
Device 230 measures the input current I in inductance L33(virtual value).
Comparison means 201 is by input current I1, input current I2, input current I3With specified input electricity
Stream virtual value IrPredetermined percentage compare, output controls the of rectification circuit 10,20 and 30
One enables signal, the second enable signal and the 3rd enable signal.
Such as, as 0 ＜ I1＜ Ir× 25%, 0 ＜ I2＜ Ir× 25%, 0 ＜ I3＜ Ir× 25%；Or 0 ＜ I1＜
Ir× 37.5%, 0 ＜ I2＜ Ir× 37.5%, I3=0；Or 0 ＜ I1＜ Ir× 37.5%, I2=0,0 ＜ I3＜ Ir× 37.5%；
Or I1=0,0 ＜ I2＜ Ir× 37.5%, 0 ＜ I3＜ IrWhen × 37.5%, comparison means 201 export 1 high
Level " 1 " and 2 low levels " 0 ", i.e. the enable signal of the first mode of operation.
Work as Ir× 25%≤I1＜ Ir× 50%, Ir× 25%≤I2＜ Ir× 50%, Ir× 25%≤I3＜ Ir× 50%；
Or Ir× 75%≤I1＜ Ir× 150%, I2=0, I3=0；Or I1=0, Ir× 75%≤I2＜ Ir× 150%, I3=0；
Or I1=0, I2=0, Ir× 75%≤I3＜ IrWhen × 150%, comparison means 201 exports 2 high level " 1 "
With 1 low level " 0 ", i.e. the enable signal of the second mode of operation.
Work as Ir× 50%≤I1,Ir× 50%≤I2,Ir× 50%≤I3；Or Ir× 150%≤I1, I2=0, I3=0；
Or I1=0, Ir× 150%≤I2, I3=0；Or I1=0, I2=0, Ir× 150%≤I3；Or Ir× 75%≤I1,
Ir× 75%≤I2, I3=0；Or Ir× 75%≤I1, I2=0, Ir× 75%≤I3；Or I1=0, Ir× 75%≤I2,
Ir× 75%≤I3Time, comparison means 201 exports 3 high level " 1 ", i.e. the third mode of operation
Enable signal.
6 and door are included with arithmetic unit 202.An each and door input receives pulsewidth respectively
Modulated signal generator 40 provide pulse-width signal PWM1, PWM1 ', PWM2,
PWM2 ', PWM3 and PWM3 '.First enable signal respectively with the arteries and veins being supplied to rectification circuit 10
Wide modulated signal PWM1 and PWM1 ' carry out with computing after be supplied in rectification circuit 10 grid drive
Dynamic device；Second enable signal respectively be supplied to rectification circuit 20 pulse-width signal PWM2 and
PWM2 ' carries out being supplied to the gate drivers in rectification circuit 20 after computing；3rd enables signal
Carry out with pulse-width signal PWM3 and PWM3 ' being supplied to rectification circuit 30 respectively with computing after
It is supplied to the gate drivers in rectification circuit 30.
The pulse-width signal enabling signal be supplied to corresponding rectification circuit is carried out and computing, can
With the pulse-width signal produced by this enable signal control pulse-width modulation signal generation unit 40 it is
The no gate drivers being provided in corresponding rectification circuit, to control the switch of each rectification circuit
The duty of pipe, under not increasing response time, can moment (within such as 100 microseconds) reality
The switching of the mode of operation of the rectification circuit in existing three-phase uninterrupted power supply.
In other embodiments of the invention, whole with three with the quantity of door with arithmetic unit 202
The quantity of the switching tube of current circuit is equal, such as, can comprise more than 6 and door.
In other embodiments of the invention, it is possible to use 6 MUX replace filling with computing
Put 6 in 202 and door.
In other embodiments of the invention, comparison means 201 can be also used for according to electric current I1、I2
And I3With specified input current virtual value IrOther predetermined percentage compare, such as can be by upper
The percentage ratio 25%, 50%, 75%, 150%, 37.5% stated replaces with 33% respectively, 66%, 100%,
200%, 50%, and export the first mode of operation, the second mode of operation or the third mode of operation
First enable signal, second enable signal and the 3rd enable signal.
Although the present invention has been described by means of preferred embodiments, but the present invention is not limited to
Embodiment as described herein, the most also includes done various
Change and change.
Claims (14)
1. a control method for the rectification circuit of three-phase uninterrupted power supply, described rectification circuit includes
First rectification circuit, the second rectification circuit and the 3rd rectification circuit, described first rectification circuit, second
The first input inductance that rectification circuit and the 3rd rectification circuit include electrically connecting with three-phase alternating current respectively,
Second input inductance and the 3rd input inductance, it is characterised in that described control method comprises the following steps:
1) measure respectively in described first input inductance, the second input inductance and the 3rd input inductance
First input current, the second input current and the 3rd input current；
2) by described first input current, the second input current and the 3rd input current respectively with described
The predetermined percentage of the specified input current of three-phase uninterrupted power supply compares, it is thus achieved that first enables letter
Number, second enable signal and the 3rd enable signal；
3) enable signal, the second enable signal and the 3rd enable signal according to described first, control institute
State the one or more work in the first rectification circuit, the second rectification circuit and the 3rd rectification circuit.
Control method the most according to claim 1, it is characterised in that in described step 3) in,
Described first rectification circuit, the second rectification circuit and the pulsewidth of the 3rd rectification circuit work is controlled by being used for
Modulated signal enables signal respectively with described first, the second enable signal and the 3rd enables signal and patrols
Collect computing, according to the first rectification circuit, the second rectification circuit described in the output control of described logical operations
With the one or more work in the 3rd rectification circuit.
Control method the most according to claim 2, it is characterised in that described logical operations is
With computing.
Control method the most according to any one of claim 1 to 3, it is characterised in that
Described step 2) in, when described first input current, the second input current and the 3rd input current all
During less than the first predetermined percentage of described specified input current, obtain for controlling described first rectification
In circuit, the second rectification circuit and the 3rd rectification circuit two idle first enable signals, the
Two enable signal and the 3rd enables signal.
Control method the most according to any one of claim 1 to 3, it is characterised in that
Described step 2) in, when described first input current, the second input current and the 3rd input current all
Not less than the first predetermined percentage of described specified input current and the most described specified input current
The second predetermined percentage time, obtain for control described first rectification circuit, the second rectification circuit and
In 3rd rectification circuit one idle first enables signal, the second enable signal and the 3rd enables
Signal.
Control method the most according to any one of claim 1 to 3, it is characterised in that
Described step 2) in, when in described first input current, the second input current and the 3rd input current
Both equal to zero, another one not less than described specified input current the 3rd predetermined percentage and
During less than four predetermined percentage of described specified input current, obtain for controlling described first rectification
In circuit, the second rectification circuit and the 3rd rectification circuit one idle first enable signal, the
Two enable signal and the 3rd enables signal.
Control method the most according to any one of claim 1 to 3, it is characterised in that
Described step 2) in, when in described first input current, the second input current and the 3rd input current
One equal to zero, and when two other is both less than five predetermined percentage of described specified input current,
Obtain for controlling two in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit
Idle first enables signal, the second enable signal and the 3rd enable signal.
8. a control device for the rectification circuit of three-phase uninterrupted power supply, described rectification circuit includes
First rectification circuit, the second rectification circuit and the 3rd rectification circuit, described first rectification circuit, second
The first input inductance that rectification circuit and the 3rd rectification circuit include electrically connecting with three-phase alternating current respectively,
Second input inductance and the 3rd input inductance, it is characterised in that described control device includes:
Current measuring unit, is used for measuring described first input inductance, the second input inductance and the 3rd defeated
Enter the first input current of inductance, the second input current and the 3rd input current；
Comparing unit, for by described first input current, the second input current and the 3rd input current
Predetermined percentage with the specified input current of described three-phase uninterrupted power supply compares respectively, it is thus achieved that
First enables signal, the second enable signal and the 3rd enable signal；And
Control device, for enabling signal, the second enable signal and the 3rd enable letter according to described first
Number, control or many in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit
Individual work.
Control device the most according to claim 8, it is characterised in that described control device is
Logical calculation device, for being used for controlling described first rectification circuit, the second rectification circuit and the 3rd
Rectification circuit work pulse-width signal respectively with described first enable signal, second enable signal and
3rd enables signal carries out logical operations, according to the first rectification described in the output control of described logical operations
One or more work in circuit, the second rectification circuit and the 3rd rectification circuit.
Control device the most according to claim 9, it is characterised in that described logical operations fills
It is set to and arithmetic unit.
11. according to Claim 8 to the control device according to any one of 10, it is characterised in that
When described first input current, the second input current and the 3rd input current are both less than described specified input
During the first predetermined percentage of electric current, the output of described enable signal generation device is used for controlling described first
In rectification circuit, the second rectification circuit and the 3rd rectification circuit two idle first enable signals,
Second enables signal and the 3rd enables signal.
12. according to Claim 8 to the control device according to any one of 10, it is characterised in that
When described first input current, the second input current and the 3rd input current are all not less than described specified defeated
Enter the first predetermined percentage and second predetermined percentage of the most described specified input current of electric current
Time, the output of described enable signal generation device is used for controlling described first rectification circuit, the second rectified current
In road and the 3rd rectification circuit one idle first enables signal, the second enable signal and the 3rd
Enable signal.
13. according to Claim 8 to the control device according to any one of 10, it is characterised in that
When in described first input current, the second input current and the 3rd input current both equal to zero,
Another one is not less than the 3rd predetermined percentage of described specified input current and less than described specified defeated
When entering four predetermined percentage of electric current, the output of described enable signal generation device is used for controlling described the
One idle first in one rectification circuit, the second rectification circuit and the 3rd rectification circuit enables letter
Number, second enable signal and the 3rd enable signal.
14. according to Claim 8 to the control device according to any one of 10, it is characterised in that
When in described first input current, the second input current and the 3rd input current is equal to zero, and
When two other is both less than five predetermined percentage of described specified input current, described enable signal produces
Generating apparatus output is used for controlling in described first rectification circuit, the second rectification circuit and the 3rd rectification circuit
Two idle first enable signals, second enable signals and the 3rd enable signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050229.0A CN105991045A (en) | 2015-01-30 | 2015-01-30 | Control method and control device for rectifier circuits of three-phase uninterruptible power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510050229.0A CN105991045A (en) | 2015-01-30 | 2015-01-30 | Control method and control device for rectifier circuits of three-phase uninterruptible power supply |
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| Publication Number | Publication Date |
|---|---|
| CN105991045A true CN105991045A (en) | 2016-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510050229.0A Pending CN105991045A (en) | 2015-01-30 | 2015-01-30 | Control method and control device for rectifier circuits of three-phase uninterruptible power supply |
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| JP2000184779A (en) * | 1998-12-17 | 2000-06-30 | Kawasaki Steel Corp | Method for controlling dc electric motor for winder |
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| CN101483387A (en) * | 2008-01-07 | 2009-07-15 | 半导体元件工业有限责任公司 | Multi-phase power supply controller and method therefor |
| CN202111493U (en) * | 2011-06-08 | 2012-01-11 | 大连大工安道船舶技术有限责任公司 | Three-phase high-power-factor uninterrupted power source |
| CN102484393A (en) * | 2009-09-16 | 2012-05-30 | 东芝三菱电机产业系统株式会社 | Power conversion system and uninterruptible power source system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000184779A (en) * | 1998-12-17 | 2000-06-30 | Kawasaki Steel Corp | Method for controlling dc electric motor for winder |
| CN201134749Y (en) * | 2007-12-24 | 2008-10-15 | 赵启阳 | Energy saving apparatus of switch power supply |
| CN101483387A (en) * | 2008-01-07 | 2009-07-15 | 半导体元件工业有限责任公司 | Multi-phase power supply controller and method therefor |
| CN102484393A (en) * | 2009-09-16 | 2012-05-30 | 东芝三菱电机产业系统株式会社 | Power conversion system and uninterruptible power source system |
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Application publication date: 20161005 |