CN106329932A - Control method and control device for direct-current converter - Google Patents
Control method and control device for direct-current converter Download PDFInfo
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- CN106329932A CN106329932A CN201510395673.6A CN201510395673A CN106329932A CN 106329932 A CN106329932 A CN 106329932A CN 201510395673 A CN201510395673 A CN 201510395673A CN 106329932 A CN106329932 A CN 106329932A
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Abstract
The invention discloses a control method and a control device for a direct-current converter in order to solve the problem of high-frequency oscillation occurring to input current and filter capacitor voltage. According to the control method, when there is a need to switch the state of a first switching unit in a direct-current converter from high-frequency chopping to power-frequency long pass, the duty ratio of the drive signal of the first switching unit is changed to a first preset duty ratio under control according to a first preset step length.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to control method and the dress of a kind of DC converter
Put.
Background technology
Current some equipment such as uninterrupted power source (UPS, Uninterruptible Power Supply),
In order to cost-effective, PFC (PFC, Power Factor the most all can be made when circuit design
Correction) circuit as far as possible with DC converter common parts.The such as uninterrupted power source shown in Fig. 1,
I.e. illustrate one and preferably share scheme；Under accumulator pattern, in dotted line frame, DC converter is to electric power storage
Cell voltage carries out boosting inverter, under utility mode, and the rectifier bridge structure of DC converter and prime in dotted line frame
PFC circuit, it is achieved power factor emendation function.Wherein, electric capacity C1 is for solution never
The cathode voltage high frequency jump problem of uninterruptible power accumulator under utility mode and the filter capacitor that introduces, should
One end of filter capacitor C1 connects two switch element (i.e. switching tube Q1 and switching tubes in DC converter
Q2) junction point, the other end of this filter capacitor C1 is connected between inductance L1 and battery positive voltage,
Certainly the other end of this filter capacitor C1 can also be connected between inductance L2 and battery terminal negative.
In prior art, the uninterrupted power source shown in Fig. 1 under accumulator pattern, the control of DC converter
As in figure 2 it is shown, wherein, g1 is the driving signal of switching tube Q1 to scheme, and g2 is the driving of switching tube Q2
Signal.When the positive half cycle inversion of the inverter of DC converter rear class works, DC converter needs to it defeated
The positive direct-current bus BUS+ going out end provides energy, and now, switching tube Q2 power frequency length is led to, switching tube Q2
The dutycycle driving signal be first to preset dutycycle, in fig. 2 this first to preset dutycycle be 1, open
Closing pipe Q1 high frequency chopping, the dutycycle driving signal of switching tube Q1 is second to preset dutycycle, and this is the years old
Two to preset dutycycle be not 1；When the inverter negative half period inversion of DC converter rear class works, direct current becomes
Parallel operation needs to provide energy to the negative dc bus BUS-of its outfan, and now, switching tube Q1 power frequency length is led to,
The dutycycle driving signal of switching tube Q1 is first to preset dutycycle, switching tube Q2 high frequency chopping, opens
The dutycycle driving signal closing pipe Q2 is second to preset dutycycle.
But, the uninterrupted power source shown in Fig. 1 is under accumulator pattern, when switching tube Q2 power frequency length is led to,
During switching tube Q1 high frequency chopping, when DC converter is in steady-working state, filter capacitor C1 voltage
It is about battery tension；When switching tube Q1 power frequency length is led to, during switching tube Q2 high frequency chopping, DC converting
When device is in steady-working state, filter capacitor C1 voltage is about 0.Therefore, in the state of switching tube Q1
By high frequency chopping switch to power frequency length state logical, switching tube Q2 switched to high frequency chopping by power frequency length is logical time,
Inductance L1 and filter capacitor C1 can produce resonance, due to filtered electrical under the excitation of filter capacitor C1 voltage
Holding C1 capacity typically small, therefore this harmonic period is far smaller than half power frequency period, makes DC converter
Input current and filter capacitor C1 voltage high frequency oscillation occurs, until filter capacitor C1 voltage consumption is complete
Finish；And switched to that power frequency length is logical in the state of switching tube Q2 by high frequency chopping, the state of switching tube Q1 by
Power frequency length is logical when switching to high frequency chopping, inductance L2 and filter capacitor C1 meeting under the excitation of battery tension
Producing resonance, this harmonic period is also far smaller than half power frequency period, make the input current of DC converter with
There is high frequency oscillation in filter capacitor C1 voltage, until filter capacitor C1 voltage is about battery tension.Should
The existence of the higher-order of oscillation not only can make DC converter noise occur when working, and more can make input electromagnetic interference
(EMI, Electromagnetic Interference) is unsatisfactory for demand.
Summary of the invention
The embodiment of the present invention provides control method and the device of a kind of DC converter, in order to solve input current
The problem higher-order of oscillation occurring with filter capacitor voltage.
Embodiments providing the control method of a kind of DC converter, described DC converter includes
DC/DC translation circuit and at least one filter capacitor；For each filter capacitor, one end of this filter capacitor
Connect the junction point that the first switch element in DC/DC translation circuit is connected, this filter with second switch unit
The first input inductance that the other end of ripple electric capacity is connected in DC/DC translation circuit supplies with for DC converter
Between the positive pole of the DC source of electricity, or, the other end of this filter capacitor is connected to DC/DC conversion electricity
The second input inductance in road and between the negative pole of DC source powered for DC converter；Described controlling party
Method, including:
Lead to needing by high frequency chopping, the state of the first switch element in DC converter is switched to power frequency length
Time, the dutycycle of the driving signal controlling the first switch element is preset step change according to first and is preset to first
Dutycycle.
It is also preferred that the left preset step change in the dutycycle driving signal controlling the first switch element according to first
Before presetting dutycycle to first, also include:
The driving signal of the driving signal and second switch unit that control the first switch element is opened at least one
In the cycle of pass identical.
Further, described first conducting duration variable quantity corresponding to step-length is preset less than the first appointment input electricity
Sense and the first harmonic period specifying filter capacitor；Described first specifies input inductance and described first to specify filter
Ripple electric capacity is can be with the input inductance of described first switch element composition resonant tank and filter unit.
It is also preferred that the left described first presets conducting duration variable quantity corresponding to step-length less than the first appointment input inductance
With first specify filter capacitor harmonic period 1/4, and described first preset step-length make described first switch
The change in duty cycle driving signal of unit presets the required duration of dutycycle less than power frequency period to first
1/4。
It is also preferred that the left said method also includes:
The state of second switch unit in DC converter is switched to high frequency chopping by power frequency length is logical needing
Time, the dutycycle of the driving signal controlling second switch unit is preset step change according to second and is preset to second
Dutycycle.
Further, described second conducting duration variable quantity corresponding to step-length is preset less than the second appointment input electricity
Sense and the second harmonic period specifying filter capacitor；Described second specifies input inductance and described second to specify filter
Ripple electric capacity is can be with the input inductance of described second switch unit composition resonant tank and filter unit.
It is also preferred that the left described second presets conducting duration variable quantity corresponding to step-length less than the second appointment input inductance
With the 1/4 of the second harmonic period specifying filter capacitor, and described second presets step-length and makes described second switch
The change in duty cycle driving signal of unit presets the required duration of dutycycle less than power frequency period to second
1/4。
The embodiment of the present invention additionally provides the control device of a kind of DC converter, and described DC converter includes
DC/DC translation circuit and at least one filter capacitor；For each filter capacitor, one end of this filter capacitor
Connect the junction point that the first switch element in DC/DC translation circuit is connected, this filter with second switch unit
The first input inductance that the other end of ripple electric capacity is connected in DC/DC translation circuit supplies with for DC converter
Between the positive pole of the DC source of electricity, or, the other end of this filter capacitor is connected to DC/DC conversion electricity
The second input inductance in road and between the negative pole of DC source powered for DC converter；Described control fills
Put, including:
First control unit, for being cut the state of the first switch element in DC converter by high frequency needing
Ripple switches to power frequency length when leading to, and the dutycycle driving signal controlling the first switch element presets step according to first
Length is changed to first and presets dutycycle.
It is also preferred that the left the first control unit, it is additionally operable to controlling the dutycycle driving signal of the first switch element
Preset before step change presets dutycycle to first according to first, control the driving signal of the first switch element
With the driving signal of second switch unit at least one switch periods identical.
Further, described first conducting duration variable quantity corresponding to step-length is preset less than the first appointment input electricity
Sense and the first harmonic period specifying filter capacitor；Described first specifies input inductance and described first to specify filter
Ripple electric capacity is can be with the input inductance of described first switch element composition resonant tank and filter unit.
It is also preferred that the left described first presets conducting duration variable quantity corresponding to step-length less than the first appointment input inductance
With first specify filter capacitor harmonic period 1/4, and described first preset step-length make described first switch
The change in duty cycle driving signal of unit presets the required duration of dutycycle less than power frequency period to first
1/4。
It is also preferred that the left said apparatus also includes:
Second control unit, for needing long by power frequency for the state of second switch unit in DC converter
Logical when switching to high frequency chopping, the dutycycle driving signal controlling second switch unit presets step according to second
Length is changed to second and presets dutycycle.
Further, described second conducting duration variable quantity corresponding to step-length is preset less than the second appointment input electricity
Sense and the second harmonic period specifying filter capacitor；Described second specifies input inductance and described second to specify filter
Ripple electric capacity is can be with the input inductance of described second switch unit composition resonant tank and filter unit.
It is also preferred that the left described second presets conducting duration variable quantity corresponding to step-length less than the second appointment input inductance
With the 1/4 of the second harmonic period specifying filter capacitor, and described second presets step-length and makes described second switch
The change in duty cycle driving signal of unit presets the required duration of dutycycle less than power frequency period to second
1/4。
The beneficial effect comprise that
In the scheme that the embodiment of the present invention provides, needing the state of the first switch element in DC converter
By high frequency chopping switch to power frequency length lead to time, control the first switch element drive signal dutycycle gradually become
Change presets dutycycle to first；The scheme using the embodiment of the present invention to provide, can destroy inductance and filtered electrical
Hold the resonant tank produced, make the time that resonant tank exists less than harmonic period, it is to avoid input current and
There is high frequency oscillation in filter capacitor voltage, thus avoids operating noise that this higher-order of oscillation introduces and electromagnetism to do
Disturb.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with this
Bright embodiment is used for explaining the present invention together, is not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is one of schematic diagram of DC converter in prior art；
Fig. 2 is the schematic diagram of the control program of DC converter in prior art；
One of schematic diagram of control program of DC converter that Fig. 3 provides for the embodiment of the present invention；
The realization signal driving signal of the switching tube in the DC converter that Fig. 4 provides for the embodiment of the present invention
Figure；
One of schematic diagram of duty of DC converter that Fig. 5 (a) provides for the embodiment of the present invention；
The two of the schematic diagram of the duty of the DC converter that Fig. 5 (b) provides for the embodiment of the present invention；
The three of the schematic diagram of the duty of the DC converter that Fig. 6 (a) provides for the embodiment of the present invention；
The four of the schematic diagram of the duty of the DC converter that Fig. 6 (b) provides for the embodiment of the present invention；
The five of the schematic diagram of the duty of the DC converter that Fig. 6 (c) provides for the embodiment of the present invention；
The six of the schematic diagram of the duty of the DC converter that Fig. 7 (a) provides for the embodiment of the present invention；
The seven of the schematic diagram of the duty of the DC converter that Fig. 7 (b) provides for the embodiment of the present invention；
The eight of the schematic diagram of the duty of the DC converter that Fig. 7 (c) provides for the embodiment of the present invention；
The nine of the schematic diagram of the duty of the DC converter that Fig. 7 (d) provides for the embodiment of the present invention；
The two of the schematic diagram of the control program of the DC converter that Fig. 8 provides for the embodiment of the present invention；
The realization driving signal of the switching tube in the DC converter that Fig. 9 (a) provides for the embodiment of the present invention is shown
One of it is intended to；
The realization driving signal of the switching tube in the DC converter that Fig. 9 (b) provides for the embodiment of the present invention is shown
The two of intention；
Figure 10 is in prior art the two of the schematic diagram of DC converter；
Figure 11 is in prior art the three of the schematic diagram of DC converter；
The schematic diagram controlling device of the DC converter that Figure 12 provides for the embodiment of the present invention.
Detailed description of the invention
Solve input current and filter capacitor voltage to be given the implementation of higher-order of oscillation problem occurs, this
Inventive embodiments provides control method and the device of a kind of DC converter, in conjunction with Figure of description to this
Bright preferred embodiment illustrates, it will be appreciated that preferred embodiment described herein be merely to illustrate and
Explain the present invention, be not intended to limit the present invention.And the enforcement in the case of not conflicting, in the application
Feature in example and embodiment can be mutually combined.
Embodiments providing the control method of a kind of DC converter, this DC converter includes
DC/DC translation circuit and at least one filter capacitor；For each filter capacitor, one end of this filter capacitor
Connect the junction point that the first switch element in DC/DC translation circuit is connected, this filter with second switch unit
The first input inductance that the other end of ripple electric capacity is connected in DC/DC translation circuit supplies with for DC converter
Between the positive pole of the DC source of electricity, or, the other end of this filter capacitor is connected to DC/DC conversion electricity
The second input inductance in road and between the negative pole of DC source powered for DC converter；This control method
Including:
Lead to needing by high frequency chopping, the state of the first switch element in DC converter is switched to power frequency length
Time, the dutycycle of the driving signal controlling the first switch element is preset step change according to first and is preset to first
Dutycycle.I.e. control the dutycycle driving signal of the first switch element to gradually change to first and preset duty
Ratio, generally, this is changed to increase change.
Wherein, first to preset dutycycle be to make the first switch element keep the logical dutycycle of power frequency length for this,
Can be, but not limited to be 1.
First presets step-length is i.e. switched to, by high frequency chopping, the mistake that power frequency length is logical in the state of the first switch element
Cheng Zhong, the change step of the dutycycle driving signal of the first switch element；From the definition of dutycycle,
Different dutycycle is corresponding different conducting duration, it is corresponding different that the most different first presets step-length
Conducting duration variable quantity.
In embodiments of the present invention, the first conducting duration variable quantity presetting step-length corresponding should be less than the first appointment
Input inductance and first specifies the harmonic period of filter capacitor；Wherein, first input inductance and first is specified to refer to
Determining filter capacitor is can be with the input inductance of the first switch element composition resonant tank and filter unit.
First to preset step-length the least, and the inhibition of concussion is the best；First to preset step-length the biggest, the first switch
The state switch speed of unit is the fastest.
It is also preferred that the left first presets conducting duration variable quantity corresponding to step-length less than the first appointment input inductance and the
The 1/4 of one harmonic period specifying filter capacitor, and first preset step-length and make the driving of the first switch element believe
Number change in duty cycle preset the required duration of dutycycle less than the 1/4 of power frequency period to first.
Concrete, first presets step-length can be according to actual application scenarios, based on actual application scenarios to switching
The requirement of speed, input current require to be determined with the concussion of filter capacitor voltage.
It is also preferred that the left preset step change in the dutycycle driving signal controlling the first switch element according to first
Before presetting dutycycle to first, it is also possible to control driving signal and the second switch unit of the first switch element
Driving signal identical at least one switch periods.I.e. in this at least one switch periods, open for two
Pass unit simultaneously turns off and simultaneously turns on, and can accelerate the energy variation of filter capacitor, such that it is able to accelerate switching
Process.
In one particular embodiment of the present invention, needing the shape of second switch unit in DC converter
When state is switched to high frequency chopping by power frequency length is logical, the dutycycle driving signal of second switch unit can be controlled
Directly it is changed to second and presets dutycycle.Generally, this is changed to reduce change.
Wherein, second to preset duty be not 1 for this, is specifically set as prior art, is not described in detail in this.
The control method that the embodiment of the present invention provides can be, but not limited to the uninterrupted power source being applied to shown in Fig. 1
In DC converter.Below with the uninterrupted power source shown in Fig. 1 under accumulator pattern, DC converter
Control as a example by, the principle of control method providing the embodiment of the present invention is described in detail.
In Fig. 1, when the duty of the inverter of DC converter rear class is switched to by negative half period inversion work
During positive half cycle inversion work, the state by DC converter breaker in middle pipe Q2 is needed to be switched to by high frequency chopping
Power frequency length is logical, the state of switching tube Q1 is switched to high frequency chopping by power frequency length is logical, the most now, and above-mentioned first
Switch element is switching tube Q2, and above-mentioned second switch unit is switching tube Q1；When DC converter rear class
When the duty of inverter is switched to negative half period inversion work by positive half cycle inversion work, need to become direct current
By high frequency chopping, the state of parallel operation breaker in middle pipe Q1 switches to that power frequency length is logical, the state of switching tube Q2 is by work
Frequency is long logical when switching to high frequency chopping, and the most now, above-mentioned first switch element is switching tube Q1, and above-mentioned the
Two switch elements are switching tube Q2.
The control method provided according to the embodiment of the present invention, the DC converting of the uninterrupted power source shown in Fig. 1
The driving signal g2 of the driving signal g1 and switching tube Q2 of device breaker in middle pipe Q1 can be as shown in Figure 3.
When implementing, the driving signal g1 of Fig. 3 breaker in middle pipe Q1 can be, but not limited to use in Fig. 4
G1 first-harmonic and triangular carrier realize, and the driving signal g2 of Fig. 3 breaker in middle pipe Q2 can be, but not limited to use
G2 first-harmonic and triangular carrier in Fig. 4 realize.
According to the control program shown in Fig. 3, the uninterrupted power source shown in Fig. 1 under accumulator pattern,
The state of DC converter breaker in middle pipe Q2 is switched to power frequency length by high frequency chopping logical, switching tube Q1
When state is switched to high frequency chopping by power frequency length is logical, the duty of DC converter is divided into three phases:
Stage 1:
The dutycycle driving signal of switching tube Q1 is directly decreased to second and presets dutycycle, switching tube Q2
Drive signal driving signal with switching tube Q1 in first switch periods identical.I.e. open at first
In the cycle of pass, switching tube Q1 and switching tube Q2 drives the dutycycle of signal identical, switching tube Q1 and opening
Closing pipe Q2 to simultaneously turn on, simultaneously turn off, DC converter provides to the positive and negative dc bus of its outfan
Identical energy.
When switching tube Q1 and switching tube Q2 simultaneously turns on, the current direction of DC converter such as Fig. 5 (a)
Shown in:
Electric current is flowed through inductance L1 by battery positive voltage, switching tube Q1, switching tube Q2, inductance L2 return to store
Battery cathode, inductance L1 and inductance L2 energy storage during this.Simultaneously because filter capacitor C1 initial voltage
Being 0, electric current is flowed through filter capacitor C1 by battery positive voltage, switching tube Q2, inductance L2 return to storage battery negative
Pole, charges to filter capacitor C1, and filter capacitor C1 voltage raises.
When switching tube Q1 and switching tube Q2 simultaneously turns on, the current direction of DC converter such as Fig. 5 (b)
Shown in:
Electric current by battery positive voltage flow through inductance L1, diode D3, bus capacitor C2, bus capacitor C3,
Diode D4, inductance L2 return to battery terminal negative, charge to bus capacitor C2, bus capacitor C3, this
During filter capacitor C1 stop charging.
Visible, in this stage 1, although when switching tube Q1 and switching tube Q2 simultaneously turns on, inductance L2
Resonance can be produced under the excitation of battery tension with filter capacitor C1, but at switching tube Q1 and switching tube
When Q2 simultaneously turns off, resonant tank is destroyed, therefore, it is possible to the generation of suppression concussion.
Stage 2: the dutycycle driving signal of switching tube Q1 is that second to preset dutycycle constant, switching tube
The dutycycle driving signal of Q2 is preset dutycycle by second and is gradually increased.I.e. open from second switch periods
Beginning, the dutycycle of the driving signal of switching tube Q1 and switching tube Q2 is the most identical, and it is given by DC converter
The energy that the positive direct-current bus of outfan provides is more than the energy provided to negative dc bus.
The change step of the dutycycle driving signal of switching tube Q2 should be less than inductance L2 and filter capacitor C1
Harmonic period.
When switching tube Q1 and switching tube Q2 simultaneously turns on, the current direction of DC converter such as Fig. 6 (a)
Shown in:
Electric current is flowed through inductance L1 by battery positive voltage, switching tube Q1, switching tube Q2, inductance L2 return to store
Battery cathode, inductance L1 and inductance L2 energy storage during this.Meanwhile, electric current is flowed through filter by battery positive voltage
Ripple electric capacity C1, switching tube Q2, inductance L2 return to battery terminal negative, charge to filter capacitor C1, filtering
Electric capacity C1 voltage raises.
When switching tube Q1 shutoff, switching tube Q2 conducting, the current direction of DC converter such as Fig. 6 (b)
Shown in:
Electric current by battery positive voltage flow through inductance L1, diode D3, bus capacitor C2, switching tube Q2,
Inductance L2 returns to battery terminal negative, charges to bus capacitor C2.Simultaneously because filter capacitor C1 voltage is low
In battery tension, electric current is flowed through filter capacitor C1 by battery positive voltage, switching tube Q2, inductance L2 return
To battery terminal negative, charging to filter capacitor C1, filter capacitor C1 voltage persistently raises.
When switching tube Q1 and switching tube Q2 simultaneously turns on, the current direction of DC converter such as Fig. 6 (c)
Shown in:
Electric current by battery positive voltage flow through inductance L1, diode D3, bus capacitor C2, bus capacitor C3,
Diode D4, inductance L2 return to battery terminal negative, charge to bus capacitor C2, bus capacitor C3, this
During filter capacitor C1 stop charging.
Visible, in this stage 2, although when switching tube Q1 and switching tube Q2 simultaneously turns on, and to open
When closing pipe Q1 shutoff, switching tube Q2 conducting, inductance L2 and filter capacitor C1 swashing at battery tension
Resonance can be produced under encouraging, but when switching tube Q1 and switching tube Q2 simultaneously turns off, resonant tank is destroyed,
Therefore, it is possible to the generation of suppression concussion.
Stage 3: the dutycycle driving signal of switching tube Q1 is that second to preset dutycycle constant, switching tube
The dutycycle driving signal of Q2 is first to preset dutycycle, and in this specific embodiment, first presets and account for
Empty ratio is 1.I.e. after several switch periods, switching tube Q2 power frequency length is led to, and it is only given by DC converter
The positive direct-current bus of outfan provides energy.
When switching tube Q1 conducting, switching tube Q2 power frequency length are led to, initial time, the electricity of DC converter
Stream flows to as shown in Fig. 7 (a):
Electric current is flowed through inductance L1 by battery positive voltage, switching tube Q1, switching tube Q2, inductance L2 return to store
Battery cathode, inductance L1 and inductance L2 energy storage during this.Meanwhile, electric current is flowed through filter by battery positive voltage
Ripple electric capacity C1, switching tube Q2, inductance L2 return to battery terminal negative, charge to filter capacitor C1, filtering
Electric capacity C1 voltage raises.
Owing to inductance L2 electric current is in constant current state, filter capacitor C1 electric current and inductance L1 electric current sum etc.
In inductance L2 electric current, inductance L1 electric current is gradually increased, and filter capacitor C1 electric current is gradually reduced, and works as inductance
When L1 electric current is more than inductance L2 electric current, filter capacitor C1 anti-phase, the now electric current of DC converter
Flow to as shown in Fig. 7 (b).
When switching tube Q1 shutoff, switching tube Q2 power frequency length are led to, initial time, the electricity of DC converter
Stream flows to as shown in Fig. 7 (c):
Electric current by battery positive voltage flow through inductance L1, diode D3, bus capacitor C2, switching tube Q2,
Inductance L2 returns to battery terminal negative, charges to bus capacitor C2.Simultaneously as filter capacitor C1 electric current
Anti-phase, inductance L1 electric current is gradually reduced, when inductance L1 electric current is less than inductance L2 electric current, and filter capacitor
C1 electric current becomes positive, now shown in the current direction of DC converter such as Fig. 7 (d).
Obviously, the control method that the embodiment of the present invention provides is used, by DC converter breaker in middle pipe Q2
State switched to power frequency length state logical, switching tube Q1 by high frequency chopping and switched to high frequency by power frequency length is logical
During copped wave, it is possible to destroy the resonant tank that inductance L2 and filter capacitor C1 produces, make resonant tank exist
Time is less than harmonic period, therefore, it is possible to the higher-order of oscillation occur in suppression input current and filter capacitor voltage.
Use the control method that the embodiment of the present invention provides, in the state by DC converter breaker in middle pipe Q1
By high frequency chopping switch to power frequency length state logical, switching tube Q2 switched to high frequency chopping by power frequency length is logical time,
The duty of DC converter is divided into three phases, specific works flow process to be not described in detail in this too.With
Reason, it is also possible to destroy the resonant tank that inductance L1 and filter capacitor C1 produce, make that resonant tank exists time
Between less than harmonic period, therefore, it is possible to there is the higher-order of oscillation in suppression input current and filter capacitor voltage.
In another specific embodiment of the present invention, needing second switch unit in DC converter
When state is switched to high frequency chopping by power frequency length is logical, it is also possible to control second switch unit drives accounting for of signal
Empty ratio is preset step change according to second and is preset dutycycle to second.I.e. control the driving letter of second switch unit
Number dutycycle gradually change to second and preset dutycycle.
Second presets step-length is i.e. led to by power frequency length in the state of second switch unit and switches to the mistake of high frequency chopping
Cheng Zhong, the change step of the dutycycle driving signal of second switch unit；From the definition of dutycycle,
Different dutycycle is corresponding different conducting duration, it is corresponding different that the most different second presets step-length
Conducting duration variable quantity.
In embodiments of the present invention, second preset conducting duration variable quantity corresponding to step-length can less than second finger
Surely input inductance and second specifies the harmonic period of filter capacitor；Wherein, second input inductance and second is specified
Specifying filter capacitor is can be with the input inductance of second switch unit composition resonant tank and filter unit.
Second to preset step-length the least, and the inhibition of concussion is the best；Second to preset step-length the biggest, second switch
The state switch speed of unit is the fastest.
It is also preferred that the left second presets conducting duration variable quantity corresponding to step-length less than the second appointment input inductance and the
The 1/4 of two harmonic periods specifying filter capacitors, and second preset step-length and make the driving of second switch unit believe
Number change in duty cycle preset the required duration of dutycycle less than the 1/4 of power frequency period to second.
Concrete, second presets step-length can be according to actual application scenarios, based on actual application scenarios to switching
The requirement of speed, input current require to be determined with the concussion of filter capacitor voltage.
Now, the driving signal g1 of the DC converter breaker in middle pipe Q1 of the uninterrupted power source shown in Fig. 1
And the driving signal g2 of switching tube Q2 can be as shown in Figure 8.
When implementing, the driving signal g1 of Fig. 8 breaker in middle pipe Q1 can be, but not limited to use Fig. 9 (a),
G1 first-harmonic in Fig. 9 (b) and triangular carrier realize, the driving signal g2 of Fig. 8 breaker in middle pipe Q2 can but
It is not limited to use the g2 first-harmonic in Fig. 9 (a), Fig. 9 (b) and triangular carrier to realize.It should be noted that figure
It is only the two kinds of implementations driving signal shown in Fig. 8 shown in 9 (a), Fig. 9 (b), is not used to limit this
Bright, it is achieved shown in Fig. 8, to drive the first-harmonic form of signal, carrier format all can freely set.Such as, g1
First-harmonic and g2 first-harmonic can also be other forms such as parabolic waveform.
The control method that the embodiment of the present invention provides can also be applied to the direct current in the dotted line frame shown in Figure 10
Changer, principle is similar to.
The control method that the embodiment of the present invention provides can also be applied to the direct current in the dotted line frame shown in Figure 11
Changer, now, a switch element is switching tube Q1 and switching tube Q2, and another switch element is for opening
Closing pipe Q3 and switching tube Q4, according to practical situation, in two switch elements, one switchs as above-mentioned first
Unit, another is as above-mentioned second switch unit.
The control method that the embodiment of the present invention provides can also be applied in other similar DC converter, at this
Illustrate the most one by one.
Based on same inventive concept, according to the controlling party of the DC converter that the above embodiment of the present invention provides
Method, correspondingly, the embodiment of the present invention also provides for the control device of a kind of DC converter, this DC converter
Including DC/DC translation circuit and at least one filter capacitor；For each filter capacitor, this filter capacitor
One end connect the junction point that the first switch element in DC/DC translation circuit is connected with second switch unit,
The first input inductance that the other end of this filter capacitor is connected in DC/DC translation circuit with for DC converting
Between the positive pole of the DC source that device is powered, or, the other end of this filter capacitor is connected to DC/DC and becomes
Change between the in circuit second input inductance and the negative pole of DC source powered for DC converter；This control
Device as shown in figure 12, including:
First control unit 1201, for needing the state of the first switch element in DC converter by height
Frequently copped wave switches to power frequency length when leading to, and control the first switch element drives the dutycycle of signal pre-according to first
If step change presets dutycycle to first.I.e. control the first switch element drives the dutycycle of signal gradually
Being changed to first and preset dutycycle, generally, this is changed to increase change.
Wherein, first to preset dutycycle be to make the first switch element keep the logical dutycycle of power frequency length for this,
Can be, but not limited to be 1.
It is also preferred that the left the first control unit 1201, it is additionally operable to accounting at the driving signal controlling the first switch element
Empty than presetting before step change presets dutycycle to first according to first, control the driving of the first switch element
Signal and the driving signal of second switch unit are identical at least one switch periods.I.e. at this at least one
In switch periods, two switch elements simultaneously turn off and simultaneously turn on, and can accelerate the energy variation of filter capacitor,
Such that it is able to acceleration handoff procedure.
Further, first preset conducting duration variable quantity corresponding to step-length less than first appointment input inductance with
First harmonic period specifying filter capacitor；First specifies input inductance and first to specify filter capacitor to be can
With input inductance and the filter unit that the first switch element constitutes resonant tank.
First to preset step-length the least, and the inhibition of concussion is the best；First to preset step-length the biggest, the first switch
The state switch speed of unit is the fastest.
It is also preferred that the left first presets conducting duration variable quantity corresponding to step-length less than the first appointment input inductance and the
The 1/4 of one harmonic period specifying filter capacitor, and first preset step-length and make the driving of the first switch element believe
Number change in duty cycle preset the required duration of dutycycle less than the 1/4 of power frequency period to first.
Concrete, first presets step-length can be according to actual application scenarios, based on actual application scenarios to switching
The requirement of speed, input current require to be determined with the concussion of filter capacitor voltage.
It is also preferred that the left this control device, also include:
Second control unit 1202, for needing the state of second switch unit in DC converter by work
Frequency is long logical when switching to high frequency chopping, and control second switch unit drives the dutycycle of signal pre-according to second
If step change presets dutycycle to second.I.e. control second switch unit drives the dutycycle of signal gradually
Being changed to second and preset dutycycle, generally, this is changed to reduce change.
Wherein, second to preset duty be not 1 for this, is specifically set as prior art, is not described in detail in this.
Further, second preset conducting duration variable quantity corresponding to step-length less than second appointment input inductance with
Second harmonic period specifying filter capacitor；Second specifies input inductance and second to specify filter capacitor to be can
With input inductance and the filter unit that second switch unit constitutes resonant tank.
Second to preset step-length the least, and the inhibition of concussion is the best；Second to preset step-length the biggest, second switch
The state switch speed of unit is the fastest.
It is also preferred that the left second presets conducting duration variable quantity corresponding to step-length less than the second appointment input inductance and the
The 1/4 of two harmonic periods specifying filter capacitors, and second preset step-length and make the driving of second switch unit believe
Number change in duty cycle preset the required duration of dutycycle less than the 1/4 of power frequency period to second.
Concrete, second presets step-length can be according to actual application scenarios, based on actual application scenarios to switching
The requirement of speed, input current require to be determined with the concussion of filter capacitor voltage.
In other embodiments of the invention, the second control unit 1202, it is also possible to be used for direct current at needs
When the state of second switch unit is switched to high frequency chopping by power frequency length is logical in changer, control second switch list
The dutycycle driving signal of unit is directly changed to second and presets dutycycle.
In sum, the scheme using the embodiment of the present invention to provide, efficiently solve input current and filtered electrical
Hold voltage and higher-order of oscillation problem occurs.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot
The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (include but not limited to disk memory,
CD-ROM, optical memory etc.) form of the upper computer program implemented.
The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not take off
Spirit and scope from the embodiment of the present invention.So, if these amendments of the embodiment of the present invention and modification belong to
Within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention be also intended to comprise these change and
Including modification.
Claims (14)
1. a control method for DC converter, described DC converter include DC/DC translation circuit and
At least one filter capacitor；For each filter capacitor, one end of this filter capacitor connects DC/DC conversion
The junction point that the first switch element in circuit is connected with second switch unit, the other end of this filter capacitor is even
The the first input inductance being connected in DC/DC translation circuit is with the DC source powered for DC converter just
Between pole, or, the second input electricity that the other end of this filter capacitor is connected in DC/DC translation circuit
Between sense and the negative pole of DC source powered for DC converter；Described control method, it is characterised in that
Including:
Lead to needing by high frequency chopping, the state of the first switch element in DC converter is switched to power frequency length
Time, the dutycycle of the driving signal controlling the first switch element is preset step change according to first and is preset to first
Dutycycle.
2. the method for claim 1, it is characterised in that in the driving controlling the first switch element
The dutycycle of signal is preset before step change presets dutycycle to first according to first, also includes:
The driving signal of the driving signal and second switch unit that control the first switch element is opened at least one
In the cycle of pass identical.
3. method as claimed in claim 1 or 2, it is characterised in that described first presets step-length correspondence
Conducting duration variable quantity less than first appointment input inductance with first appointment filter capacitor harmonic period；Institute
State the first appointment input inductance and described first appointment filter capacitor is can be with described first switch element structure
Become input inductance and the filter unit of resonant tank.
4. method as claimed in claim 3, it is characterised in that described first presets corresponding the leading of step-length
Logical duration variable quantity specifies the 1/4 of the harmonic period of filter capacitor less than the first appointment input inductance and first,
And described first preset step-length make described first switch element drive signal change in duty cycle pre-to first
If the required duration of dutycycle is less than the 1/4 of power frequency period.
5. the method for claim 1, it is characterised in that also include:
The state of second switch unit in DC converter is switched to high frequency chopping by power frequency length is logical needing
Time, the dutycycle of the driving signal controlling second switch unit is preset step change according to second and is preset to second
Dutycycle.
6. method as claimed in claim 5, it is characterised in that described second presets corresponding the leading of step-length
Logical duration variable quantity specifies the harmonic period of filter capacitor less than the second appointment input inductance and second；Described
Two specify input inductance and described second to specify filter capacitor to be can to constitute humorous with described second switch unit
Shake the input inductance in loop and filter unit.
7. method as claimed in claim 6, it is characterised in that described second presets corresponding the leading of step-length
Logical duration variable quantity specifies the 1/4 of the harmonic period of filter capacitor less than the second appointment input inductance and second,
And described second preset step-length make described second switch unit drive signal change in duty cycle pre-to second
If the required duration of dutycycle is less than the 1/4 of power frequency period.
8. a control device for DC converter, described DC converter include DC/DC translation circuit and
At least one filter capacitor；For each filter capacitor, one end of this filter capacitor connects DC/DC conversion
The junction point that the first switch element in circuit is connected with second switch unit, the other end of this filter capacitor is even
The the first input inductance being connected in DC/DC translation circuit is with the DC source powered for DC converter just
Between pole, or, the second input electricity that the other end of this filter capacitor is connected in DC/DC translation circuit
Between sense and the negative pole of DC source powered for DC converter；Described control device, it is characterised in that
Including:
First control unit, for being cut the state of the first switch element in DC converter by high frequency needing
Ripple switches to power frequency length when leading to, and the dutycycle driving signal controlling the first switch element presets step according to first
Length is changed to first and presets dutycycle.
9. device as claimed in claim 8, it is characterised in that the first control unit, is additionally operable in control
The dutycycle of the driving signal making the first switch element is preset step change according to first and is preset duty to first
Before, control the first switch element drives the signal driving signal with second switch unit at least one to ratio
In switch periods identical.
10. device as claimed in claim 8 or 9, it is characterised in that described first presets step-length correspondence
Conducting duration variable quantity less than first appointment input inductance with first appointment filter capacitor harmonic period；Institute
State the first appointment input inductance and described first appointment filter capacitor is can be with described first switch element structure
Become input inductance and the filter unit of resonant tank.
11. devices as claimed in claim 10, it is characterised in that described first to preset step-length corresponding
Conducting duration variable quantity specifies the harmonic period of filter capacitor less than the first appointment input inductance and first
1/4, and described first preset step-length make described first switch element drive signal change in duty cycle to first
Preset the required duration of dutycycle less than the 1/4 of power frequency period.
12. devices as claimed in claim 8, it is characterised in that also include:
Second control unit, for needing long by power frequency for the state of second switch unit in DC converter
Logical when switching to high frequency chopping, the dutycycle driving signal controlling second switch unit presets step according to second
Length is changed to second and presets dutycycle.
13. devices as claimed in claim 12, it is characterised in that described second to preset step-length corresponding
Conducting duration variable quantity specifies the harmonic period of filter capacitor less than the second appointment input inductance and second；Described
Second specifies input inductance and described second to specify filter capacitor to be can to constitute with described second switch unit
The input inductance of resonant tank and filter unit.
14. devices as claimed in claim 13, it is characterised in that described second to preset step-length corresponding
Conducting duration variable quantity specifies the harmonic period of filter capacitor less than the second appointment input inductance and second
1/4, and described second preset step-length make described second switch unit drive signal change in duty cycle to second
Preset the required duration of dutycycle less than the 1/4 of power frequency period.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510395673.6A CN106329932B (en) | 2015-07-06 | 2015-07-06 | A kind of control method and device of DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510395673.6A CN106329932B (en) | 2015-07-06 | 2015-07-06 | A kind of control method and device of DC converter |
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| CN106329932B CN106329932B (en) | 2019-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865494A (en) * | 2021-01-19 | 2021-05-28 | 清华大学 | Method for suppressing high-frequency oscillation in alternating-current distribution parameter network of direct-current transformer |
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| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| US20080061628A1 (en) * | 2006-09-08 | 2008-03-13 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
| US20150078036A1 (en) * | 2013-09-16 | 2015-03-19 | Delta Electronics, Inc. | Power converters for wide input or output voltage range and control methods thereof |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499178A (en) * | 1991-12-16 | 1996-03-12 | Regents Of The University Of Minnesota | System for reducing harmonics by harmonic current injection |
| US20080061628A1 (en) * | 2006-09-08 | 2008-03-13 | American Power Conversion Corporation | Method and apparatus for providing uninterruptible power |
| CN102611295A (en) * | 2012-03-13 | 2012-07-25 | 华为技术有限公司 | Power factor corrector |
| US20150078036A1 (en) * | 2013-09-16 | 2015-03-19 | Delta Electronics, Inc. | Power converters for wide input or output voltage range and control methods thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112865494A (en) * | 2021-01-19 | 2021-05-28 | 清华大学 | Method for suppressing high-frequency oscillation in alternating-current distribution parameter network of direct-current transformer |
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| CN106329932B (en) | 2019-05-31 |
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