CN107404240B - Single-phase high function is because of AC to DC converter circuit and its control method - Google Patents
Single-phase high function is because of AC to DC converter circuit and its control method Download PDFInfo
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- CN107404240B CN107404240B CN201710552980.XA CN201710552980A CN107404240B CN 107404240 B CN107404240 B CN 107404240B CN 201710552980 A CN201710552980 A CN 201710552980A CN 107404240 B CN107404240 B CN 107404240B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention is suitable for AC to DC switch technology field, the single-phase high function of one kind is provided because of AC to DC converter circuit and its control method, the input terminal of the first rectification circuit connects AC power source in the circuit, the input terminal of the output end connection resonant mode DC-DC converter of first rectification circuit, the input terminal of the output end connection synchronous boost formula converter of resonant mode DC-DC converter, the input terminal of the output end connection synchronous buck formula converter of synchronous boost formula converter, the output end of synchronous buck formula converter connect load；Controller includes the first driving circuit, the second driving circuit and third driving circuit；First driving circuit control resonant mode DC-DC converter opens or closes；Second driving circuit control synchronous boost formula converter opens or closes；Third driving circuit control synchronous buck formula converter opens or closes.The present invention solves the problem of that traditional pfc circuit forms surge current and causes device breakdown, is suitble to application.
Description
Technical field
The invention belongs to AC to DC switch technology fields, more particularly to a kind of single-phase high function is because of AC to DC converter circuit
And its control method.
Background technique
The high function of traditional single phase because switched-mode power supply there is two-stage circuit framework as shown in Figure 1, prime is non-isolated PFC
(Power Factor Correction, PFC) AC-DC (AC-DC) rectifier (rectifier), rear class
For isolated DC-DC converter, Fig. 2 and Fig. 3 are common circuit framework, and Fig. 2 is PFC boost formula AC-DC rectifier
In conjunction with full-bridge type phase shift DC-DC (DC-DC) converter, Fig. 3 is boost type AC-DC rectifier combination LLC (Logical
Link Control, logic link control) resonant mode DC-DC converter.PFC boost formula AC-DC rectifier is that common PFC is whole
Flow device framework, be suitable for global general-use voltage change because of it and alternating voltage be converted into 400VDC voltage, have high efficiency and
The advantages that control is easy, but boost type Pfc converter DC output side is bulky capacitor, therefore alternating voltage input moment is to this
DC capacitor charging, forms sizable input current, be easy to cause device breakdown, be unable to satisfy practical application needs.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of single-phase high function because of AC to DC converter circuit and its control method,
Device breakdown is caused to solve the problem of that traditional pfc circuit forms surge current.
In a first aspect, the embodiment of the invention provides a kind of single-phase high function because of AC to DC converter circuit, including the first rectification
Circuit, resonant mode DC-DC converter, synchronous boost formula converter, synchronous buck formula converter and controller；
The input terminal of first rectification circuit connects AC power source, described in the output end connection of first rectification circuit
The output end of the input terminal of resonant mode DC-DC converter, the resonant mode DC-DC converter connects the synchronization
The input terminal of voltage-boosting converter, the output end of the synchronous boost formula converter connect the defeated of the synchronous buck formula converter
Enter end, the output end of the synchronous buck formula converter connects load；
The controller includes the first driving circuit, the second driving circuit and third driving circuit；
First driving circuit exports the control signal of default duty ratio to the resonant mode DC-DC converter, controls
The resonant mode DC-DC converter opens or closes；
Second driving circuit is referred to according to output voltage, the first pre-set output voltage of the synchronous boost formula converter
The output electricity of value, the input voltage of the resonant mode DC-DC converter and the resonant mode DC-DC converter
Stream, controls the synchronous boost formula converter and opens or closes；
Output voltage of the third driving circuit according to the synchronous buck formula converter, the second pre-set output voltage reference value
With the output electric current of the synchronous buck formula converter, controls the synchronous buck formula converter and open or close.
Second aspect, the embodiment of the invention provides a kind of single-phase high function because of the control method of AC to DC converter circuit, packet
It includes:
The control signal of default duty ratio is exported to resonant mode DC-DC converter, controls resonant mode dc-dc
Converter opens or closes；
According to the output voltage of synchronous boost formula converter, the first pre-set output voltage reference value, resonant mode direct current to straight
The input voltage of stream transformer and the output electric current of resonant mode DC-DC converter, control synchronous boost formula converter are opened
Or it closes；
It is converted according to the output voltage of synchronous buck formula converter, the second pre-set output voltage reference value and synchronous buck formula
The output electric current of device, control synchronous buck formula converter open or close.
Existing beneficial effect is the embodiment of the present invention compared with prior art: combination resonant mode direct current of the embodiment of the present invention
Forming one to direct current transducer and synchronous boost formula converter has a pfc circuit framework being isolated, and alternating current will not when circuit start
Directly to DC capacitor charge, no surge current problem, the output DC voltage of PFC also more general PFC be it is low, not will cause group
Part damage solves the disadvantage that above-mentioned traditional pfc circuit, while DC-DC converter is synchronous buck formula converter, can essence
Output voltage really and is quickly adjusted, practical application needs are met.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the high function of tradition because of switched-mode power supply circuit framework schematic diagram；
Fig. 2 is traditional PFC boost formula AC-DC rectifier combination full-bridge type phase shift DC-DC converter circuit schematic diagram；
Fig. 3 is traditional PFC boost formula AC-DC rectifier combination LLC resonant mode DC-DC converter circuit schematic diagram；
Fig. 4 is the single-phase high function of the offer of the embodiment of the present invention one because of AC to DC converter circuit structural schematic diagram；
Fig. 5 is the structural schematic diagram of resonant mode DC-DC converter provided by one embodiment of the present invention；
Fig. 6 is the structural schematic diagram of synchronous boost formula converter provided by one embodiment of the present invention；
Fig. 7 is the structural schematic diagram of synchronous buck formula converter provided by one embodiment of the present invention；
Fig. 8 is single-phase high function provided by Embodiment 2 of the present invention because of AC to DC converter circuit structural schematic diagram；
Fig. 9 is the equivalent circuit signal of the resonant mode DC-DC converter of high frequency provided by one embodiment of the present invention
Figure；
Figure 10 is that the work wave of the resonant mode DC-DC converter of high frequency provided by one embodiment of the present invention shows
It is intended to；
Figure 11 is the control configuration diagram of synchronous boost formula converter provided by one embodiment of the present invention；
Figure 12 is the control loop schematic diagram of synchronous boost formula converter provided by one embodiment of the present invention；
Figure 13 is schematic equivalent circuit provided by one embodiment of the present invention；
Figure 14 is voltage control loop schematic diagram provided by one embodiment of the present invention；
Figure 15 is voltage-boosting converter voltage control loop design diagram provided by one embodiment of the present invention；
Figure 16 is the control configuration diagram of synchronous buck formula converter provided by one embodiment of the present invention；
Figure 17 is Average Current Control current loop design diagram provided by one embodiment of the present invention；
Figure 18 is voltage circuit schematic equivalent circuit provided by one embodiment of the present invention；
Figure 19 is voltage circuit control block diagram provided by one embodiment of the present invention；
Figure 20 is voltage circuit Bode diagram provided by one embodiment of the present invention；
Figure 21 is artificial circuit schematic diagram provided by one embodiment of the present invention；
Figure 22 is that one embodiment of the invention provides the simulation result schematic diagram of PFC partial circuit；
Figure 23 is the simulation result schematic diagram of buck-converter provided by one embodiment of the present invention；
Figure 24 is the simulation result schematic diagram of resonant circuit provided by one embodiment of the present invention；
Figure 25 is the single-phase high function of the offer of the embodiment of the present invention three because the control method process of AC to DC converter circuit is illustrated
Figure.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one
Structural schematic diagram of the single-phase high function because of AC to DC converter circuit of the offer of the embodiment of the present invention one is shown in Fig. 4.
As shown in figure 4, in this embodiment, which includes the first rectification circuit because of AC to DC converter circuit
BR1401, resonant mode DC-DC converter 402, synchronous boost formula converter 403, synchronous buck formula converter 404 and control
Device 405 processed.
The input terminal of first rectification circuit 401 connects AC power source, and the output end of first rectification circuit 401 connects
Connect the input terminal of the resonant mode DC-DC converter 402, the output end of the resonant mode DC-DC converter 402
The input terminal of the synchronous boost formula converter 403 is connected, the output end connection of the synchronous boost formula converter 403 is described same
The input terminal of buck-converter 404 is walked, the output end of the synchronous buck formula converter 404 connects load.
The controller 405 includes the first driving circuit 4051, the second driving circuit 4052 and third driving circuit 4053.
First driving circuit 4051 exports the control signal of default duty ratio to the resonant mode DC-DC converter
402, it controls the resonant mode DC-DC converter 402 and opens or closes.
Second driving circuit 4052 is according to the output voltage V of the synchronous boost formula converter 403d, the first default output
Voltage reference value Vd,ref, the resonant mode DC-DC converter 402 input voltage VinWith the resonant mode direct current to straight
The output electric current I of stream transformer 402L, control the synchronous boost formula converter 403 and open or close.
Third driving circuit 4053 is according to the output voltage V of the synchronous buck formula converter 404o, the second default output
Voltage reference value Vo,refWith the output electric current I of the synchronous buck formula converter 404o, control the synchronous buck formula converter
404 open or close.
Here, the first driving circuit 4051 can be exported close to the square wave signal of 50% duty ratio to resonant mode direct current extremely
Direct current transducer 402, control resonant mode DC-DC converter 402 open or close.
It is evidenced from the above discussion that combination resonant mode DC-DC converter of the embodiment of the present invention and synchronous boost formula are converted
Device forms a pfc circuit framework with isolation, and alternating current will not directly charge to DC capacitor when circuit start, no surge current
Problem, the output DC voltage of PFC also more general PFC be it is low, not will cause device breakdown, solve above-mentioned traditional pfc circuit
Disadvantage, while DC-DC converter is synchronous buck formula converter, can accurately and quickly adjust output voltage.
In addition, in a specific example, second driving circuit includes:
First voltage error amplifier Gv, for according to the first sensing voltage vdIt is referred to first pre-set output voltage
Value Vd,refIt is adjusted signal im, the first sensing voltage vdAccording to the output voltage V of the synchronous boost formula converterdWith
Predeterminated voltage senses ratio KvIt determines.
First current error amplifier Gc, for according to current order iLCWith the first sensing electric current iLObtain the first control electricity
Press Vcon, the current order iLCAccording to the adjustment signal imIt is determined with the second sensing voltage, the first sensing electric current iLRoot
According to the output electric current I of the resonant mode DC-DC converterLRatio K is sensed with predetermined currentsIt determines, second sensing
Voltage is according to the input voltage V of the resonant mode DC-DC converterinRatio K is sensed with the predeterminated voltagevIt determines.
First PWM, for according to the first control voltage VconThe synchronous boost formula converter is controlled to open or close
It closes.
In addition, in a specific example, the third driving circuit includes:
Second voltage error amplifier Gvr, for according to third sensing voltage voIt is referred to second pre-set output voltage
Value Vo,refObtain inductive current order ioc, the third sensing voltage voAccording to the output voltage of the synchronous buck formula converter
VoRatio K is sensed with the predeterminated voltagevIt determines.
Second current error amplifier Gir, for according to the inductive current order iocWith the second sensing electric current ioObtain
Two control voltage vconr, the second sensing electric current ioAccording to the output electric current I of the synchronous buck formula converteroWith it is described pre-
If current sense ratio KsIt determines；
2nd PWM, for according to the second control voltage vconrThe synchronous buck formula converter is controlled to open or close
It closes.
In addition, as shown in figure 5, in a specific example, the resonant mode DC-DC converter includes:
Transformer, the transformer include primary side and primary side.
The input terminal of first order circuit, the first order circuit connects AC power source, the output end of the first order circuit
Connect the primary side, the first order circuit includes the first branch and second branch in parallel, the first branch include according to
Secondary concatenated first switch tube Q1With second switch Q2, the second branch includes the first capacitor C being sequentially connected in series1With second
Capacitor C2, the first tie point setting of the primary side is in the first switch tube Q1With the second switch Q2Between, it is described
Second tie point of primary side is arranged in the first capacitor C1With the second capacitor C2Between.
The input terminal of second level circuit, the second level circuit connects the primary side, the output of the second level circuit
End connects the input terminal of the synchronous boost formula converter, and second level circuit includes the second rectification circuit BR2, second rectification
The input terminal of circuit BR2 connects the primary side, and the first output end of the second rectification circuit BR2 connects the synchronous boost
The input terminal of formula converter, the second output terminal ground connection of second rectification circuit.
In addition, as shown in fig. 6, in a specific example, the synchronous boost formula converter includes the first inductance L, the
Three branches and third capacitor, one end of the third branch be separately connected the third capacitor one end and the synchronous buck formula
The other end of the input terminal of converter, the other end of the third branch and the third capacitor is grounded, the third branch packet
Include the third switching tube S being sequentially connected in series1With the 4th switching tube S2, one end of the first inductance L connects the resonant mode direct current extremely
The output end of direct current transducer, the other end of the first inductance L are connected to the third switching tube S1With the 4th switch
Pipe S2Between.
In addition, as shown in fig. 7, the synchronous buck formula converter includes the second inductance L in a specific example0,
Four branches and the 4th capacitor, one end of the 4th branch connect the output end of the synchronous boost formula converter, and the described 4th
The other end of branch is grounded, and the 4th branch includes the 5th switching tube S being sequentially connected in series3With the 6th switching tube S4, described second
One end of inductance is connected to the 5th switching tube S3With the 6th switching tube S4Between, the other end point of second inductance
One end of not described 4th capacitor and load, the other end ground connection of the 4th capacitor.
In addition, in a specific example, the second level circuit in the resonant mode DC-DC converter further includes
5th capacitor, the first output end of second rectification circuit be separately connected the 5th capacitor one end and the synchronous boost
The other end of the input terminal of formula converter, the second output terminal of second rectification circuit and the 5th capacitor is grounded.
Embodiment two
Foregoing circuit in order to better understand, the single-phase high function of a present invention detailed below is because of AC to DC converter circuit
Application example.
Single-phase high function because AC to DC converter circuit circuit framework as shown in figure 8, the resonant mode direct current comprising a high frequency extremely
Isolated PFC direct current composed by direct current transducer voltage-boosting converter synchronous with one is to a-c transducer and a synchronous mode
Buck-converter, wherein KvAnd KsThe respectively sensing ratio of voltage and current.The resonant converter of high frequency need not control,
The control of PFC is then completed by synchronous boost formula converter, and output voltage is converted to a higher pressure and with secondary ripple
DC voltage, then by synchronous mode buck-converter by voltage be down to load needed for lower and without secondary ripple voltage.
(1) the resonant mode DC-DC converter of high frequency
The movement of the resonant mode DC-DC converter of high frequency can be illustrated with the equivalent circuit of Fig. 9, wherein handing over
Flow bridge rectifier after voltage specific work because under be half-sine wave, therefore high-frequency resonant formula DC-DC converter one switching
It can be inputted under period with a voltage source VinTo indicate.It exports the input electricity due to being connected to synchronous voltage-boosting converter
Sense, therefore can be with a current source ILTo represent.Switching tube Q1And Q2The interaction triggering and conducting in a manner of close to 50% duty ratio, so that
Transformer leakage inductance LrWith output capacitance CrA current source resonant circuit is formed, the work wave of circuit is as shown in Figure 10, switching tube
Q1And Q2Waveform be zero voltage switching.
(2) synchronous boost formula converter
The control of PFC input current is controlling its inductive current by synchronous boost formula converter to carry out such as Figure 11, electricity
Stream order iLCIt is the adjustment signal i generated by voltage circuitmWith the input voltage K of sensingvVinIt is generated after multiplication, it is flat using state
Equal method can be obtained by Figure 11:
Wherein d is the duty ratio of lower arm switch, ignores VdAnd VrVariation, can be obtained by (1):
Consider current sense ratio KsAnd the gain of PWM can obtain:
For the system of single order, current error amplifier (Gc) can be designed using error of the second kind amplifier mode such as figure
Shown in 12, due to being only capable of intersecting with its sawtooth signal once in one period of control voltage of PWM, the maximum of current loop
Bandwidth omegacoBy VconThe rate of rise be less than PWM sawtooth wave (Vt) the rate of rise limitation, VconThe rate of rise can be by feeling
The inductive current descending slope of survey is via GcAmplification determines, can be obtained by above-mentioned limitation:
Wherein fsFor the switching frequency of synchronous boost formula converter, ωcoFor the zero-crossing angular frequency of current loop.(4) weight
New arrange can obtain:
By (3) and (5) and utilize Gc,max(ωco)Hi(ωco)=1 can obtain:
(6) rearranging can obtain:
Therefore the highest bandwidth of current loop may be expressed as:
(8) if pointing out to control voltage VconRate of rise limitation with design, theoretical maximum current loop bandwidth has can
It can be higher than or be too close to switching frequency, therefore can not be set with this value, be generally limited to noise ratio, bandwidth omegacoSelection can
To be set in the 1/4~1/8 of switching frequency.Once bandwidth omegacoAfter selection, can use K-factor method puts error of the second kind
The z=ω of big deviceco/ K, p=ωco/K。
It can be obtained by the power-balance of the import and export side of voltage-boosting converter:
VrIL=VdId (9)
Due to VrIt is the input voltage V by primary sidein=Vm|sinw1T | it is reflected into secondary side via resonant converter,
It can indicate are as follows:
Wherein VmFor the amplitude of input ac voltage, w1For the frequency of alternating voltage, N1And N2For resonant converter transformation
The number of turns of device primary side and secondary side.Again at PFC, the control block diagram of Figure 11, I are utilizedLIt may be expressed as:
Wherein ImFor ILAmplitude.Utilize (9) can obtain:
It utilizes (12) to be expressed as Figure 13 the small-signal model of two-stage circuit voltage circuit, and can be obtained using Figure 13:
Recycle (11) can obtain:
Utilize (14) can draw voltage circuit control block diagram it is as shown in figure 14, for this single order HvSystem, voltage miss
Poor amplifier (Gv) can be designed using error of the second kind amplifier mode, Bode diagram is as shown in figure 15, and Bandwidth-Constrained is in straight
Flow chain VdThe secondary ripple of voltage, therefore the amplitude i for making current order can be designed at 20HzmHas lower secondary ripple, most
Make inductive current order i eventuallyLCFor the waveform of low distortion, then by convection loop adjustment so that iLAnd the exchange input of primary side
Electric current isFor the sine wave of low distortion, achieve the purpose that PFC.
(3) synchronous buck formula converter
Synchronous buck formula converter is responsible for adjusting output voltage, uses double loop Average Current Control, average current control
The control block diagram of system is as shown in figure 16, by external loop voltage error amplifier (Gvr) make voltage adjustment generation inductive current
Order (ioc), recycle the inductive current (i of sensingo) and iocCompare and the error amplifier (G through overcurrentir) produce after adjustment
Control voltage (V needed for raw PWMconr), finally again by VconrWith the sawtooth wave (V of PWMt) compare the trigger signal switched.
A. current loop designs
Using state averaging method, can be obtained by Figure 16:
Ignore VoAnd VdVariation, can be obtained by (15):
Consider that the gain of current sense ratio and PWM can obtain:
For the system of the single order of (17), current error amplifier (Gir) can be set using error of the second kind amplifier mode
Meter is as shown in figure 17, due to being only capable of intersecting with its sawtooth signal once in one period of control voltage of PWM, current loop
Maximum bandwidth (wco) by VconrThe rate of rise be less than PWM sawtooth wave (Vt) the rate of rise limitation, VconrRising it is oblique
Rate can be by the inductive current descending slope that senses via GirAmplification determines, can be obtained by above-mentioned limitation:
(18) rearranging can obtain:
By (17) and (19) and utilize Gir,max(wco)Hi(wco)=1 can obtain:
(20) rearranging can obtain:
Therefore the highest bandwidth of current loop may be expressed as:
It is generally limited to noise ratio, bandwidth (wco) selection may be set in the 1/4~1/8 of switching frequency.Once bandwidth
(wco) after selection, can use K-factor method makes the z=w of error of the second kind amplifierco/ K, p=wco/K。
B. voltage circuit designs
The response speed of general voltage circuit is far below the response speed of current loop, therefore in medelling voltage circuit
When, current loop can be considered as to ideal, that is, the response that the inductive current sensed is ordered with it is considered as 1, it may be assumed that
Based on this it is assumed that the voltage circuit equivalent circuit of Average Current Control can simplify as shown in figure 18, wherein ReFor
The equivalent series resistance of output capacitance can be obtained by Figure 18:
The control block diagram for utilizing (23) and (24) can draw voltage circuit is as shown in figure 19, the error difference amplification of voltage
Device (Gvr) can also be designed using error of the second kind amplifier above-mentioned as shown in figure 20, the bandwidth of voltage circuit can be set
Meter is the 1/3~1/5 of current loop bandwidth.
In order to verify above-mentioned proposed high function because of AC to DC converter circuit, Figure 21 devises a 1kW according to the above method,
48VdcThe converter of output, wherein the output voltage of voltage-boosting converter is set as 130Vdc, analog result such as Figure 22-24 institute
Show, the part Figure 22 shows the movement of PFC partial circuit, and voltage-boosting converter, which can make its electric current follow its order, makes input current
For low distortion and the input power factor approaches, and output voltage also can accurately be maintained 130Vdc.Figure 23 show buck and turns
The waveform of output voltage and the inductive current tracking of parallel operation, display output voltage can accurately be adjusted to 48V, and inductive current is also
Its secret order is closely tracked, the design of buck-converter is verified.Figure 24 show the waveform of resonant converter part, display
Switch can reach zero voltage switching and diode current can also reach zero current switching, and converter is made to have high efficiency.More than
These proof of analog result principle and design of the above-mentioned single-phase high function because of AC to DC converter circuit.
It is evidenced from the above discussion that the present embodiment combination resonant converter and synchronous mode boost type (Boost) converter shape
The pfc circuit framework that there is isolation at one；The control of PFC is located at secondary side, can carry out with the control of DC-DC converter
Integration is to reduce control cost；Alternating current will not directly charge to DC capacitor when circuit start, no surge current problem, PFC's
Export DC voltage also more general PFC be it is low, solves the disadvantage that it is above-mentioned tradition pfc circuit；DC-DC converter is to synchronize
Buck-converter can accurately and quickly adjust output voltage.
Embodiment three
The reality of control method of the single-phase high function of the offer of the embodiment of the present invention three because of AC to DC converter circuit is shown in Figure 25
Existing process.In this embodiment it is that being illustrated by taking the treatment process of controller as an example.
As shown in figure 25, in this embodiment, details are as follows for the treatment process of controller:
Step S251 exports the control signal of default duty ratio to resonant mode DC-DC converter, controls resonant mode
DC-DC converter opens or closes.
Step S252, according to the output voltage of synchronous boost formula converter, the first pre-set output voltage reference value, resonant mode
The input voltage of DC-DC converter and the output electric current of resonant mode DC-DC converter, control synchronous boost formula turn
Parallel operation opens or closes.
Step S253, according to the output voltage of synchronous buck formula converter, the second pre-set output voltage reference value with it is synchronous
The output electric current of buck-converter, control synchronous buck formula converter open or close.
In addition, in a specific example, the output voltage according to synchronous boost formula converter, the first default output
The output electricity of voltage reference value, the input voltage of resonant mode DC-DC converter and resonant mode DC-DC converter
Stream, control synchronous boost formula converter, which opens or closes, includes:
Signal, first sensing are adjusted according to the first sensing voltage and the first pre-set output voltage reference value
Voltage senses ratio-dependent according to the output voltage and predeterminated voltage of the synchronous boost formula converter；
The first control voltage is obtained according to current order and the first sensing electric current, the current order is believed according to the adjustment
Number and the second sensing voltage determine that the first sensing electric current is according to the output electric current of the resonant mode DC-DC converter
Ratio-dependent is sensed with predetermined current, second sensing voltage is electric according to the input of the resonant mode DC-DC converter
Pressure and the predeterminated voltage sense ratio-dependent；
The synchronous boost formula converter is controlled according to the first control voltage to open or close.
In addition, in a specific example, the output voltage according to synchronous buck formula converter, the second default output
The output electric current of voltage reference value and synchronous buck formula converter, control synchronous buck formula converter, which opens or closes, includes:
Inductive current order, the third are obtained according to third sensing voltage and the second pre-set output voltage reference value
Sensing voltage senses ratio-dependent according to the output voltage of the synchronous buck formula converter and the predeterminated voltage；
The second control voltage, the second sensing electric current root are obtained according to the inductive current order and the second sensing electric current
Ratio-dependent is sensed according to the output electric current of the synchronous buck formula converter and the predetermined current；
The synchronous buck formula converter is controlled according to the second control voltage to open or close.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process
Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit
It is fixed.
It is evidenced from the above discussion that alternating current will not directly charge to DC capacitor when the present embodiment circuit start, no surge electricity
Flow problem, the output DC voltage of PFC also more general PFC be it is low, not will cause device breakdown, solve above-mentioned traditional pfc circuit
The shortcomings that, while DC-DC converter is synchronous buck formula converter, can accurately and quickly adjust output voltage.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different functions
Unit, module are completed, i.e., the internal structure of described device are divided into different functional unit or module, to complete above description
All or part of function.It can be each unit in embodiment to physically exist alone, it can also be with two or more lists
Member is integrated in one unit, and above-mentioned integrated unit both can take the form of hardware realization, can also use software function
The form of unit is realized.In addition, the specific name of each functional unit, module is also only for convenience of distinguishing each other, it is not used to
Limit the protection scope of the application.The specific work process of module in above-described embodiment, can be with reference to pair in previous embodiment
Process is answered, details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that mould described in conjunction with the examples disclosed in the embodiments of the present disclosure
Block can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions actually with hardware still
Software mode executes, specific application and design constraint depending on technical solution.Professional technician can be to each
Specific application is to use different methods to achieve the described function, but this realization is it is not considered that exceed model of the invention
It encloses.
In embodiment provided by the present invention, it should be understood that disclosed device, it can be real by another way
It is existing.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the module, only one kind are patrolled
Volume function division, there may be another division manner in actual implementation, such as multiple units or components can combine or can be with
It is integrated into another system, or some features can be ignored or not executed.Another point, it is shown or discussed mutual
Coupling or direct-coupling or communication connection can be through some interfaces, and the INDIRECT COUPLING or communication connection of device or unit can
To be electrically mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It is physically existed alone in addition, can be each unit in each embodiment of the present invention, it can also be two or two
The above unit is integrated in one unit.Above-mentioned integrated unit both can take the form of hardware realization, can also use soft
The form of part functional unit is realized.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (8)
1. a kind of single-phase high function is because of AC to DC converter circuit, which is characterized in that including the first rectification circuit, resonant mode direct current to straight
Stream transformer, synchronous boost formula converter, synchronous buck formula converter and controller；
The input terminal of first rectification circuit connects AC power source, and the output end of first rectification circuit connects the resonance
The output end of the input terminal of formula DC-DC converter, the resonant mode DC-DC converter connects the synchronous boost
The input terminal of formula converter, the output end of the synchronous boost formula converter connect the input of the synchronous buck formula converter
The output end at end, the synchronous buck formula converter connects load；
The controller includes the first driving circuit, the second driving circuit and third driving circuit；
First driving circuit exports the control signal of default duty ratio to the resonant mode DC-DC converter, described in control
Resonant mode DC-DC converter opens or closes；
Output voltage of second driving circuit according to the synchronous boost formula converter, the first pre-set output voltage reference value, institute
The input voltage of resonant mode DC-DC converter and the output electric current of the resonant mode DC-DC converter are stated, is controlled
The synchronous boost formula converter opens or closes；Wherein, second driving circuit includes:
First voltage error amplifier, for being adjusted according to the first sensing voltage and the first pre-set output voltage reference value
Entire signal, first sensing voltage are true according to the output voltage and predeterminated voltage of the synchronous boost formula converter sensing ratio
It is fixed；
First current error amplifier, for obtaining the first control voltage, the electricity according to current order and the first sensing electric current
Stream order determines according to the adjustment signal and the second sensing voltage, the first sensing electric current according to the resonant mode direct current extremely
The output electric current and predetermined current of direct current transducer sense ratio-dependent, and second sensing voltage is according to the resonant mode direct current
Ratio-dependent is sensed to the input voltage of direct current transducer and the predeterminated voltage；
First PWM is opened or closed for controlling the synchronous boost formula converter according to the first control voltage；
Third driving circuit is according to the output voltage of the synchronous buck formula converter, the second pre-set output voltage reference value and institute
The output electric current for stating synchronous buck formula converter controls the synchronous buck formula converter and opens or closes.
2. single-phase high function according to claim 1 is because of AC to DC converter circuit, which is characterized in that the third driving circuit
Include:
Second voltage error amplifier, for obtaining electricity according to third sensing voltage and the second pre-set output voltage reference value
Inducing current order, output voltage and the predeterminated voltage sense of the third sensing voltage according to the synchronous buck formula converter
Survey ratio-dependent；
Second current error amplifier, for obtaining the second control electricity according to the inductive current order and the second sensing electric current
Pressure, the second sensing electric current are true according to the output electric current of the synchronous buck formula converter and predetermined current sensing ratio
It is fixed；
2nd PWM is opened or closed for controlling the synchronous buck formula converter according to the second control voltage.
3. single-phase high function according to claim 1 is because of AC to DC converter circuit, which is characterized in that the resonant mode direct current is extremely
Direct current transducer includes:
Transformer, the transformer include primary side and primary side；
First order circuit, the input terminal of the first order circuit connect AC power source, the output end connection of the first order circuit
The primary side, the first order circuit include the first branch and second branch in parallel, and the first branch includes successively going here and there
The first switch tube and second switch of connection, the second branch include the first capacitor being sequentially connected in series and the second capacitor, described
First tie point of primary side is arranged between the first switch tube and the second switch, and the second of the primary side connects
Contact is arranged between the first capacitor and second capacitor；
Second level circuit, the input terminal of the second level circuit connect the primary side, and the output end of the second level circuit connects
The input terminal of the synchronous boost formula converter is connect, second level circuit includes the second rectification circuit, second rectification circuit
Input terminal connects the primary side, and the first output end of second rectification circuit connects the defeated of the synchronous boost formula converter
Enter end, the second output terminal ground connection of second rectification circuit.
4. single-phase high function according to claim 1 is because of AC to DC converter circuit, which is characterized in that the synchronous boost formula turns
Parallel operation includes the first inductance, third branch and third capacitor, and one end of the third branch is separately connected the third capacitor
The input terminal of one end and the synchronous buck formula converter, the other end of the other end of the third branch and the third capacitor
Ground connection, the third branch include the third switching tube and the 4th switching tube being sequentially connected in series, one end connection of first inductance
The output end of the resonant mode DC-DC converter, the other end of first inductance be connected to the third switching tube and
Between 4th switching tube.
5. single-phase high function according to claim 1 is because of AC to DC converter circuit, which is characterized in that the synchronous buck formula turns
Parallel operation includes the second inductance, the 4th branch and the 4th capacitor, and one end of the 4th branch connects the synchronous boost formula conversion
The output end of device, the other end ground connection of the 4th branch, the 4th branch includes the 5th switching tube being sequentially connected in series and the
Six switching tubes, one end of second inductance are connected between the 5th switching tube and the 6th switching tube, and described second
The other end of inductance distinguishes one end and the load of the 4th capacitor, the other end ground connection of the 4th capacitor.
6. single-phase high function according to claim 3 is because of AC to DC converter circuit, which is characterized in that the second level circuit is also
Including the 5th capacitor, the first output end of second rectification circuit be separately connected one end of the 5th capacitor with it is described synchronous
The other end of the input terminal of voltage-boosting converter, the second output terminal of second rectification circuit and the 5th capacitor is grounded.
7. it is a kind of based on the single-phase high function of one kind as claimed in any one of claims 1 to 6 because of the controlling party of AC to DC converter circuit
Method characterized by comprising
The control signal of default duty ratio is exported to resonant mode DC-DC converter, controls the conversion of resonant mode dc-dc
Device opens or closes；
Turned according to the output voltage of synchronous boost formula converter, the first pre-set output voltage reference value, resonant mode dc-dc
The input voltage of parallel operation and the output electric current of resonant mode DC-DC converter, control synchronous boost formula converter are opened or are closed
It closes；Wherein, the output voltage according to synchronous boost formula converter, the first pre-set output voltage reference value, resonant mode direct current
To the input voltage of direct current transducer and the output electric current of resonant mode DC-DC converter, synchronous boost formula converter is controlled
Opening or closing includes: to be adjusted signal according to the first sensing voltage and the first pre-set output voltage reference value, described
First sensing voltage senses ratio-dependent according to the output voltage and predeterminated voltage of the synchronous boost formula converter；According to electric current
Order and the first sensing electric current obtain the first control voltage, and the current order is according to the adjustment signal and the second sensing voltage
It determines, the first sensing electric current senses ratio according to the output electric current and predetermined current of the resonant mode DC-DC converter
Example determines that second sensing voltage is according to the input voltage and the predeterminated voltage of the resonant mode DC-DC converter
Sense ratio-dependent；The synchronous boost formula converter is controlled according to the first control voltage to open or close；
According to the output voltage of synchronous buck formula converter, the second pre-set output voltage reference value and synchronous buck formula converter
Electric current is exported, control synchronous buck formula converter opens or closes.
8. single-phase high function according to claim 7 is because of the control method of AC to DC converter circuit, which is characterized in that described
According to the output electricity of the output voltage of synchronous buck formula converter, the second pre-set output voltage reference value and synchronous buck formula converter
Stream, control synchronous buck formula converter, which opens or closes, includes:
Inductive current order, the third sensing are obtained according to third sensing voltage and the second pre-set output voltage reference value
Voltage senses ratio-dependent according to the output voltage of the synchronous buck formula converter and the predeterminated voltage；
The second control voltage is obtained according to the inductive current order and the second sensing electric current, the second sensing electric current is according to institute
State the output electric current and predetermined current sensing ratio-dependent of synchronous buck formula converter；
The synchronous buck formula converter is controlled according to the second control voltage to open or close.
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