CN107204720A - A kind of ac-dc conversion circuit, AC/DC convertor and its control method - Google Patents
A kind of ac-dc conversion circuit, AC/DC convertor and its control method Download PDFInfo
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- CN107204720A CN107204720A CN201710534640.4A CN201710534640A CN107204720A CN 107204720 A CN107204720 A CN 107204720A CN 201710534640 A CN201710534640 A CN 201710534640A CN 107204720 A CN107204720 A CN 107204720A
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- bridge arm
- switching tube
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- inductance
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
Abstract
The present invention provides a kind of ac-dc conversion circuit, AC/DC convertor and its control method, and ac-dc conversion circuit includes the common mode inductance of the filter circuit positioned at DC port, the first HF switch bridge arm, the second HF switch bridge arm, low frequency switch bridge arm, the filter circuit of AC port, AC port filter capacitor and two HF switch bridge arms of connection and AC port filter inductance.Pass through the implementation of this ac-dc conversion circuit, so that AC port ripple current can drop to original 1/4, and each high frequency bridge arm connects a winding of common mode inductance, and it is typically very big so as to flow through the common mode current of two winding relative to differential-mode current very little from the sensibility reciprocal of common mode inductance, therefore the electric current of above-mentioned two windings of common mode inductance is necessarily close to equal, i.e. the electric current of AC port is undertaken by two high frequency bridge arms respectively naturally, power circuit autonomous equalizing current is realized, the operating efficiency of circuit is improved.
Description
Technical field
The present invention relates to ac-dc conversion technology, more particularly to a kind of ac-dc conversion circuit, AC/DC convertor and its
Control method.
Background technology
In various application occasions such as new energy photovoltaic system, energy-storage system and charging system for electric automobile, it is desirable to electric energy
Energy in converter can be with two-way flow：Energy is that the energy-storage units such as battery can be flowed to by power network, realizes the storage of electric energy,
Meanwhile, require that energy can flow to power network or the individually output in the form of AC power from energy-storage units again, realize power network electric energy
Regulation or meet the use of electric energy under the conditions of off-network.Above-mentioned functions are realized, except needing the isolated DC of highly effective straight
Beyond current converter, in addition it is also necessary to the non-isolated AC DC reversible transducer that more efficient, volume is smaller and cost is lower.
For monophase system, traditional two-way AC/DC convertor is typically using the full-bridge circuit of four switching tube compositions
And the circuit structure of AC port LC filtering, two switching tubes are composed in series a bridge arm above and below it, have two bridge arms, such as scheme
Shown in 1, in order to reduce the common mode disturbances of circuit, while in order to which the switching loss for reducing circuit improves circuit efficiency, the full-bridge
One bridge arm of circuit is generally operational in the low frequency switch state with AC frequency with frequency, and another bridge arm is then operated in height
The all complementary conducting of two switching tubes, its switching drive signal waveform such as Fig. 2 institutes above and below frequency SPWM on off states, any one bridge arm
Show that above circuit is limited by switching device own loss, switching frequency can not possibly be made too high, then be carried in AC port
Pulsating volage frequency on LC filtering port would not be too high.The ripple current of AC port is flowed into so as to ensure to hand in order to reduce
The quality of side electric energy is flowed, the volume of rear class LC wave filters particularly filter inductance will be than larger.So, whole alternating current-direct current is caused
Converter volume is big, and cost is high, while the efficiency of converter is also difficult to improve.
The content of the invention
The first mesh of the present invention is to provide a kind of ac-dc conversion circuit of the crisscross parallel of power circuit autonomous equalizing current.
The second mesh of the present invention is to provide a kind of AC/DC convertor of the crisscross parallel of power circuit autonomous equalizing current.
The 3rd mesh of the present invention is to provide a kind of ac-dc conversion circuit of the crisscross parallel of power circuit autonomous equalizing current
Control method.
In order to realize the first object of the present invention, the present invention provides a kind of ac-dc conversion circuit, it is characterised in that including
First filter circuit, low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm, the first filter circuit is with handing over
The DC port connection of DC transfer circuit, low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm point
It is not connected in parallel with DC port；
Low frequency switch bridge arm includes first switch pipe and second switch pipe, the source electrode of first switch pipe and the drain electrode of second switch pipe
Connection；
First HF switch bridge arm includes the 3rd switching tube and the 4th switching tube, the source electrode of the 3rd switching tube and the 4th switching tube
Drain electrode connection；
Second HF switch bridge arm includes the 5th switching tube and the 6th switching tube, the source electrode of the 5th switching tube and the 6th switching tube
Drain electrode connection；
Ac-dc conversion circuit also includes common mode inductance and the second filter circuit, the first Same Name of Ends of the first winding of common mode inductance
It is connected with the source electrode of the 3rd switching tube, the second Same Name of Ends of the second winding of common mode inductance is connected with the source electrode of the 5th switching tube,
Second Same Name of Ends of the first winding, the source electrode of the first Same Name of Ends of the second winding and first switch pipe and the second filter circuit connect
Connect, the AC port connection of the second filter circuit and ac-dc conversion circuit.
Further scheme is, the second filter circuit includes the first inductance and the first electric capacity, the first end of the first inductance,
The first Same Name of Ends connection of second Same Name of Ends of the first winding and the second winding, the of the second end of the first inductance and the first electric capacity
One end is connected, and the second end of the first electric capacity is connected with the source electrode of first switch pipe.
Further scheme is that the second filter circuit includes the first inductance, the second inductance and the first electric capacity, the first inductance
First end be connected with the second Same Name of Ends of the first winding, the first Same Name of Ends of the first end of the second inductance and the second winding connects
Connect, the connection of the first end at the second end of the first inductance, the second end of the second inductance and the first electric capacity, the second end of the first electric capacity with
The source electrode connection of first switch pipe.
In order to realize the first object of the present invention, the present invention provides a kind of ac-dc conversion circuit, it is characterised in that including
First filter circuit, low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm, the first filter circuit is with handing over
The DC port connection of DC transfer circuit, low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm point
It is not connected in parallel with DC port；
Low frequency switch bridge arm includes first switch pipe and second switch pipe, the source electrode of first switch pipe and the drain electrode of second switch pipe
Connection；
First HF switch bridge arm includes the 3rd switching tube and the 4th switching tube, the source electrode of the 3rd switching tube and the 4th switching tube
Drain electrode connection；
Second HF switch bridge arm includes the 5th switching tube and the 6th switching tube, the source electrode of the 5th switching tube and the 6th switching tube
Drain electrode connection；
Ac-dc conversion circuit also includes the first inductance, the second inductance and the first electric capacity, and the first end of the first inductance is opened with the 3rd
The source electrode connection of pipe is closed, the first end of the second inductance is connected with the source electrode of the 5th switching tube, the second end of the first inductance, the second electricity
Second end of sense is connected with the first end of the first electric capacity, and the second end of the first electric capacity is connected with the source electrode of first switch pipe, and first
Electric capacity is in parallel with the AC port of ac-dc conversion circuit.
In order to realize the first object of the present invention, the present invention provides a kind of ac-dc conversion circuit, it is characterised in that including
The DC port connection of first filter circuit, three-phase bridge arm component, the first filter circuit and ac-dc conversion circuit, each phase
Bridge arm component is connected in parallel with DC port respectively；
The bridge arm component of each phase includes：
First HF switch bridge arm, including first switch pipe and second switch pipe, source electrode and the second switch pipe of first switch pipe
Drain electrode connection；
Second HF switch bridge arm, including the 3rd switching tube and the 4th switching tube, the source electrode and the 4th switching tube of the 3rd switching tube
Drain electrode connection；
Common mode inductance, the first Same Name of Ends of the first winding of common mode inductance is connected with the source electrode of the 3rd switching tube, common mode inductance
Second Same Name of Ends of the second winding is connected with the source electrode of first switch pipe, the second Same Name of Ends of the first winding, the of the second winding
The output end connection of one Same Name of Ends and bridge arm component；
Ac-dc conversion circuit also includes the second filter circuit, the output end of the bridge arm component of each phase respectively with the second filtered electrical
Road is connected, and the AC port of the second filter circuit and ac-dc conversion circuit is connected.
Further scheme is, the second filter circuit is AC three-phase LC wave filters, the bridge arm component of each phase it is defeated
Go out input of the end respectively with AC three-phase LC wave filters to be connected.
From such scheme, the ripple frequency that the ac-dc conversion circuit of this case is carried in the voltage on AC port can
For twice of switching frequency, and half of the amplitude of pulsing when there was only noninterlace control, therefore in the feelings of same ac filter inductance
Under condition, pass through the implementation of this ac-dc conversion circuit so that AC port ripple current can drop to original 1/4, moreover, by
A winding of common mode inductance is connected in each high frequency bridge arm, and it is typically very big so as to flow through it from the sensibility reciprocal of common mode inductance
The common mode current of two windings can be ignored relative to differential-mode current very little, therefore two windings of above-mentioned common mode inductance
Electric current is necessarily close to equal.That is, due to the presence of above-mentioned common mode inductance, the electric current of AC port is naturally respectively by two
Individual high frequency bridge arm undertakes, and realizes power circuit autonomous equalizing current, improves the operating efficiency of circuit.And it is equal applied to this electric current
The design of stream, can also be used on three-phase AC/DC conversion circuit, can also realize the purpose of the present invention.
In order to realize the second object of the present invention, the present invention provides a kind of AC/DC convertor, it is characterised in that including handing over
DC transfer circuit and control unit, ac-dc conversion circuit are the ac-dc conversion circuit of any one of such scheme, control
Unit includes：
Frequency plot identification circuit, for receiving alternating voltage sampled signal；
First drive circuit, the control signal exported for receives frequency phase identification circuit, the first drive circuit is opened low frequency
Bridge arm is closed to be driven
Device is controlled to adjust, for receiving alternating voltage sampled signal, alternating current sampled signal and DC voltage sampled signal；
Carrier signal generator, for outgoing carrier signal；
Phase-shift circuit, for receiving carrier signal；
First SPWM modulators, the control signal and carrier signal of device output are controlled to adjust for receiving；
2nd SPWM modulators, the control signal of device output and the phase shift carrier wave letter of phase-shift circuit output are controlled to adjust for receiving
Number；
Second drive circuit, the modulated signal for receiving the output of the first SPWM modulators, the second drive circuit is to the first high frequency
Switch bridge arm is driven；
3rd drive circuit, the modulated signal for receiving the output of the 2nd SPWM modulators, the 3rd drive circuit is to the second high frequency
Switch bridge arm is driven.
In order to realize the second object of the present invention, the present invention provides a kind of AC/DC convertor, including ac-dc conversion electricity
Road and control unit, ac-dc conversion circuit are the ac-dc conversion circuit in such scheme；
Control unit includes：
Frequency plot identification circuit, for receiving alternating voltage sampled signal；
First drive circuit, the control signal exported for receives frequency phase identification circuit, the first drive circuit is opened low frequency
Bridge arm is closed to be driven
Device is controlled to adjust, for receiving alternating voltage sampled signal and DC voltage sampled signal；
First comparator, the alternating current reference signal of device output and the current sample letter of the first inductance are controlled to adjust for receiving
Number；
Second comparator, the alternating current reference signal of device output and the current sample letter of the second inductance are controlled to adjust for receiving
Number；
First current regulator, the Regulate signal for receiving first comparator output；
Second current regulator, the Regulate signal for receiving the output of the second comparator；
Carrier signal generator, for outgoing carrier signal；
Phase-shift circuit, for receiving carrier signal；
First SPWM modulators, control signal and carrier signal for receiving the first current regulator；
2nd SPWM modulators, are carried for receiving the control signal of the second current regulator output and the phase shift of phase-shift circuit output
Ripple signal；
Second drive circuit, the modulated signal for receiving the output of the first SPWM modulators, the second drive circuit is to the first high frequency
Switch bridge arm is driven；
3rd drive circuit, the modulated signal for receiving the output of the 2nd SPWM modulators, the 3rd drive circuit is to the second high frequency
Switch bridge arm is driven.
From such scheme, negative-feedback regu- lation is carried out according to different control purposes, corresponding control signal is exported to first
SPWM modulators and the 2nd SPWM modulators, and different control purposes include but is not limited to stablize alternating voltage, stable alternating current
Stream or stable DC voltage etc. so that the ripple frequency for the voltage being carried on AC port can be twice of switching frequency, and
Pulsation amplitude only has half during noninterlace control, therefore in the case of same ac filter inductance, is become by this alternating current-direct current
The implementation of parallel operation so that AC port ripple current can drop to original 1/4, is additionally, since the connection of each high frequency bridge arm
One winding of common mode inductance, and the very big common mode current phase so as to flow through two winding of sensibility reciprocal typically from common mode inductance
For differential-mode current very little, can be ignored, thus two windings of above-mentioned common mode inductance electric current necessarily close to equal.Also
It is to say, due to the presence of above-mentioned common mode inductance, the electric current of AC port is undertaken by two high frequency bridge arms respectively naturally, is realized
Power circuit autonomous equalizing current, improves the operating efficiency of circuit.
In order to realize the third object of the present invention, the present invention provides a kind of control method for ac-dc conversion circuit,
Characterized in that, ac-dc conversion circuit is the ac-dc conversion circuit of any one of such scheme；
Control method includes：
Control first switch pipe and the complementation conducting of second switch pipe, the working frequency of low frequency switch bridge arm and the voltage of AC port
Frequency is identical, and the duty cycle of switching of low frequency switch bridge arm is 50%, the action moment of first switch pipe, the action of second switch pipe
Moment and the voltage zero-cross timing synchronization of AC port；
The 3rd switching tube and the complementation conducting of the 4th switching tube are controlled, the working frequency of the first HF switch bridge arm is default high frequency
Switching frequency, the duty cycle of switching of the first HF switch bridge arm is according to alternating voltage sampled signal, alternating current sampled signal
Gained is calculated with DC voltage sampled signal；
The 5th switching tube and the complementation conducting of the 6th switching tube are controlled, the working frequency of the second HF switch bridge arm is default high frequency
Switching frequency, the duty cycle of switching of the second HF switch bridge arm be according to alternating voltage sampled signal, alternating current sampled signal,
DC voltage sampled signal and phase signal calculate gained, and phase signal is the output signal and the 5th switching tube of the 3rd switching tube
Output signal between phase difference.
In order to realize the second object of the present invention, the present invention provides a kind of AC/DC convertor, including ac-dc conversion electricity
Road and control unit, control unit are realized when being used to perform the computer program stored in memory as controlled in claim 9
The step of method.
From such scheme, by the control method of this case, the non-equal duty ratio misphase work of two groups of high frequency bridge arms of control,
The current uniform of two groups of high frequency bridge arms is realized using double-current inner ring, the ac-dc conversion controlling party provided by the present invention
Method, not only realizes the operating efficiency that power circuit autonomous equalizing current improves circuit, can also reduce AC by misphase work
The volume of filter circuit, and realize the current uniform of misphase work bridge arm and improve circuit operating efficiency possess good practicality
Property.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing full-bridge AC/DC convertor.
Fig. 2 is the drive waveforms figure of the corresponding power tube of Fig. 1 circuit diagrams.
Fig. 3 is the circuit diagram of ac-dc conversion circuit first embodiment of the present invention.
Fig. 4 is the circuit diagram of ac-dc conversion circuit second embodiment of the present invention.
Fig. 5 is the circuit diagram of control unit in AC/DC convertor first embodiment of the present invention.
Fig. 6 is the waveform diagram of AC/DC convertor first embodiment of the present invention.
Fig. 7 is the circuit diagram of ac-dc conversion circuit 3rd embodiment of the present invention.
Fig. 8 is the circuit diagram of ac-dc conversion circuit fourth embodiment of the present invention.
Fig. 9 is the circuit diagram of control unit in AC/DC convertor second embodiment of the present invention.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
Ac-dc conversion circuit first embodiment：
Reference picture 3, ac-dc conversion circuit includes the first filter circuit, low frequency switch bridge arm, the first HF switch bridge arm and the
The DC port connection of two HF switch bridge arms, the first filter circuit and ac-dc conversion circuit, it is low frequency switch bridge arm, first high
Frequency switch bridge arm and the second HF switch bridge arm are connected in parallel with DC port respectively, and the voltage of DC port is Vdc, the first filter
Wave circuit includes the electric capacity C2 for being connected in parallel on DC port.
Low frequency switch bridge arm includes first switch pipe Q1 and second switch pipe Q2, and first switch pipe Q1 source electrode is opened with second
Close pipe Q2 drain electrode connection.
First HF switch bridge arm includes the 3rd switching tube Q3 and the 4th switching tube Q4, the 3rd switching tube Q3 source electrode and the
Four switching tube Q4 drain electrode connection.
Second HF switch bridge arm includes the 5th switching tube Q5 and the 6th switching tube Q6, the 5th switching tube Q5 source electrode and the
Six switching tube Q6 drain electrode connection, first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube and the 5th switching tube,
The grid of 6th switching tube connects with control unit and receives drive signal and realizes corresponding conducting and block, first switch respectively
The positive pole of pipe, the drain electrode of the 3rd switching tube and the 5th switching tube and DC port is connected, second switch pipe, the 4th switching tube and the
The source electrode of six switching tubes and the negative pole of DC port are connected.
Ac-dc conversion circuit also includes common mode inductance L2 and the second filter circuit, the of common mode inductance L2 the first winding
One Same Name of Ends is connected with the 3rd switching tube Q3 source electrode, the second Same Name of Ends and the 5th switching tube of common mode inductance L2 the second winding
Q5 source electrode connection, the second Same Name of Ends is one end for being represented with * in figure.
The LC filter circuits of second filter circuit, the second filter circuit includes the first inductance L1 and the first electric capacity C1, first
The first Same Name of Ends connection of inductance L1 first end, the second Same Name of Ends of the first winding and the second winding, the of the first inductance L1
Two ends are connected with the first electric capacity C1 first end, and the first electric capacity C1 the second end is connected with first switch pipe Q1 source electrode, and first
Electric capacity C1 is connected in parallel on the two ends of AC port.
Ac-dc conversion circuit second embodiment：
It is based on above-mentioned first embodiment in identical principle, ac-dc conversion circuit second embodiment is mainly to common mode inductance
The filter circuit of L2 rear classes is improved.
Reference picture 4, the second filter circuit includes the first inductance L11, the first inductance L12 and the first electric capacity C1, the first inductance
L11 first end is connected with the second Same Name of Ends of the first winding, the first inductance L12 first end and the first of the second winding of the same name
End connection, the first end connection at the first inductance L11 the second end, the first inductance L12 the second end and the first electric capacity C1, the first electricity
The second end for holding C1 is connected with first switch pipe Q1 source electrode, and the first electric capacity C1 is connected in parallel on the two ends of AC port.
AC/DC convertor first embodiment：
Reference picture 5, AC/DC convertor includes ac-dc conversion circuit and control unit 1, and ac-dc conversion circuit is above-mentioned
Ac-dc conversion circuit in one embodiment, control unit 1 includes drive circuit 11, drive circuit 12, drive circuit 13, frequency
Phase identification circuit 14, SPWM modulators 15, SPWM modulators 16, carrier signal generator 17, phase-shift circuit 18 and control are adjusted
Device 19 is saved, frequency plot identification circuit 14 is used to receive alternating voltage sampled signal Vac, drive circuit 11 is for receives frequency phase
The control signal that position identification circuit 14 is exported, drive circuit 11 is to first switch pipe Q1 in low frequency switch bridge arm and second switch pipe
Q2's is driven.
Controlling to adjust device 19 is used to receive alternating voltage sampled signal Vac, alternating current sampled signal iL1And DC voltage
Sampled signal Vdc, carrier signal generator 17 is used for outgoing carrier signal, and carrier signal includes but is not limited to sawtooth waveforms and triangle
Ripple, phase-shift circuit 18 is used to receive carrier signal and phase shift is carried out to carrier signal, and SPWM modulators 15, which are used to receive, to be controlled to adjust
Control signal Va and carrier signal vtr1 that device 19 is exported are saved, controlling to adjust device can control purpose to carry out negative-feedback regu- lation according to it
Corresponding control signal is exported, difference control purpose includes but is not limited to stablize alternating voltage, stable alternating current or stable straight
Flow voltage.SPWM modulators 16 are used to receive the control signal for controlling to adjust the output of device 19 and the phase shift of the output of phase-shift circuit 18 is carried
Ripple signal vtr2.
Drive circuit 12 is used for the modulated signal for receiving the output of SPWM modulators 15,12 pair of first HF switch of drive circuit
3rd switching tube Q3 of bridge arm and the 4th switching tube Q4 are driven, and drive circuit 13 is used to receive the output of SPWM modulators 16
Modulated signal, the 5th switching tube Q5 and the 6th switching tube Q5 of 13 pair of second HF switch bridge arm of drive circuit are driven.
Reference picture 6, is illustrated by the control method of waveform diagram combination ac-dc conversion circuit.
The control method of ac-dc conversion circuit includes：
Control first switch pipe Q1 and second switch pipe Q2 complementation conductings, the working frequency of low frequency switch bridge arm and AC port
Electric voltage frequency is identical, and the duty cycle of switching of low frequency switch bridge arm is 50%, first switch pipe Q1 action moment, second switch pipe
Q2 action moment and the voltage zero-cross timing synchronization of AC port.
The 3rd switching tube Q3 and the 4th switching tube Q4 complementation conductings are controlled, the working frequency of the first HF switch bridge arm is pre-
If HF switch frequency, the duty cycle of switching of the first HF switch bridge arm is according to alternating voltage sampled signal, alternating current
Sampled signal and DC voltage sampled signal calculate gained.
The 5th switching tube Q5 and the 6th switching tube Q6 complementation conductings are controlled, the working frequency of the second HF switch bridge arm is pre-
If HF switch frequency, the duty cycle of switching of the second HF switch bridge arm is according to alternating voltage sampled signal, alternating current
Sampled signal, DC voltage sampled signal and phase signal calculate gained, and phase signal is the 3rd switching tube Q3 output signal
Phase difference between the 5th switching tube Q5 output signal.
By analyzing the circuit of above-described embodiment, opening and closing due to the corresponding switching tube of two HF switch bridge arms
Certain phase angle is opened in dislocation, then causing will be in three kinds of state in same switch periods internal memory：Two high frequency bridge arms it is upper
Pipe (such as Q3 and Q5) simultaneously turns on that state, the down tube of two high frequency bridge arms simultaneously turn on state and the upper pipe of a high frequency bridge arm is led
The state of logical and another high frequency bridge arm simultaneously down tube conducting.Analysis is understood：The state that (Q3 and Q5) is simultaneously turned on is managed in correspondence,
Then the voltage of common mode inductance L2 two winding one end is all DC port voltage Vdc, so as to be carried in ac filter port
Voltage VB is DC port voltage Vdc, correspondence down tube (Q4 and Q6) state for simultaneously turning on, then the two of common mode inductance L2 around
Group one end voltage be all zero, the voltage VB for being carried in ac filter port is zero, correspondence one high frequency bridge arm on pipe conducting and
The state of another high frequency bridge arm down tube conducting, then the terminal voltage of common mode inductance L2 a winding one is Vdc, and another winding one
Terminal voltage is zero, and because two umber of turns are equal, its voltage is also equal, therefore is carried in the voltage VB of ac filter port and is
Vdc/2 .Its correspondence waveform correlation is as shown in fig. 6, there it can be seen that the arteries and veins for the voltage VB being carried on ac filter port
Dynamic frequency is twice of switching frequency, and pulsation amplitude only has half during noninterlace control, therefore in same ac filter inductance
In the case of, AC port ripple current drops to original 1/4.
Further analysis, because each high frequency bridge arm connects a winding of common mode inductance, and typically from common mode electricity
The very big common mode current so as to flow through two winding of the sensibility reciprocal of sense can be ignored relative to differential-mode current very little, therefore on
The electric current of two windings of common mode inductance is stated necessarily close to equal.That is, due to the presence of above-mentioned common mode inductance, AC port
Electric current undertaken respectively by two high frequency bridge arms naturally, improve the operating efficiency of circuit.
Ac-dc conversion circuit 3rd embodiment：
Ac-dc conversion circuit includes the first filter circuit, three-phase bridge arm component, the first filter circuit and ac-dc conversion circuit
DC port connection, the bridge arm component of each phase is connected in parallel with DC port respectively.
The composition all same of each bridge arm component, is illustrated, it includes with a phase bridge arm component below：First high frequency is opened
Bridge arm, the second HF switch bridge arm, common mode inductance L11 and the second filter circuit are closed, the first HF switch bridge arm is opened including first
Pipe Q1 and second switch pipe Q2 is closed, first switch pipe Q1 source electrode is connected with second switch pipe Q2 drain electrode, the second HF switch
Bridge arm includes the 3rd switching tube Q3 and the 4th switching tube Q4, and the drain electrode of the 3rd switching tube Q3 source electrode and the 4th switching tube Q4 connects
Connect.The positive pole of switching tube Q1, Q3, Q5, Q7, Q9, Q11 drain electrode and DC port is connected, switching tube Q2, Q4, Q6, Q8, Q10,
Q12 source electrode and the negative pole of DC port are connected.
First Same Name of Ends of common mode inductance L11 the first winding is connected with the 3rd switching tube Q3 source electrode, common mode inductance L11
The second Same Name of Ends of the second winding be connected with first switch pipe Q1 source electrode.Second filter circuit filters for AC three-phase LC
Device, AC three-phase LC wave filters include three inductance LA、LB、LCWith three electric capacity CAB、CBC、CCA, the second of the first winding be of the same name
End, the output end connection of the first Same Name of Ends of the second winding and bridge arm component, the output end of the bridge arm component of each phase respectively with
It is used as the inductance L of filter input endA、LB、LCConnection, electric capacity CAB、CBC、CCAConnected in three-legged structure, as shown in Figure 7.
Ac-dc conversion circuit fourth embodiment：
Reference picture 8, ac-dc conversion circuit includes the first filter circuit, low frequency switch bridge arm, the first HF switch bridge arm and the
The DC port connection of two HF switch bridge arms, the first filter circuit and ac-dc conversion circuit, it is low frequency switch bridge arm, first high
Frequency switch bridge arm and the second HF switch bridge arm are connected in parallel with DC port respectively, and low frequency switch bridge arm includes first switch pipe
Q1 and second switch pipe Q2, first switch pipe Q1 source electrode are connected with second switch pipe Q2 drain electrode, the first HF switch bridge arm
Including the 3rd switching tube Q3 and the 4th switching tube Q4, the 3rd switching tube Q3 source electrode is connected with the 4th switching tube Q4 drain electrode, the
Two HF switch bridge arms include the 5th switching tube Q5 and the 6th switching tube Q6, the 5th switching tube Q5 source electrode and the 6th switching tube Q6
Drain electrode connection.The positive pole connection of first switch pipe, the drain electrode of the 3rd switching tube and the 5th switching tube and DC port, second opens
Guan Guan, the source electrode of the 4th switching tube and the 6th switching tube and DC port negative pole connection.
Ac-dc conversion circuit also includes the first inductance L21, the second inductance L22 and the first electric capacity C21, the first inductance L21
First end be connected with the 3rd switching tube Q3 source electrode, the second inductance L22 first end is connected with the 5th switching tube Q5 source electrode,
First inductance L21 the second end, the second inductance L22 the second end are connected with the first electric capacity C21 first end, the first electric capacity C21
The second end be connected with first switch pipe Q1 source electrode, the first electric capacity C21 is in parallel with the AC port of ac-dc conversion circuit.
AC/DC convertor second embodiment：
Reference picture 9, AC/DC convertor includes ac-dc conversion circuit and control unit 2, and ac-dc conversion circuit is above-mentioned the
Ac-dc conversion circuit in four embodiments.
Control unit 2 includes drive circuit 21, drive circuit 22, drive circuit 23, frequency plot identification circuit 24, SPWM
Modulator 25, SPWM modulators 26, carrier signal generator 27, phase-shift circuit 28, control to adjust device 291, first comparator, the
Two comparators, the first current regulator 293 and the second current regulator 292, frequency plot identification circuit 24, which is used to receive, to be exchanged
Voltage sampling signal Vac, the control signal that drive circuit 21 is exported for receives frequency phase identification circuit 24, drive circuit 22
First switch pipe Q2 in low frequency switch bridge arm and second switch pipe Q2 are driven.
Controlling to adjust device 291 is used to receive alternating voltage sampled signal VacWith DC voltage sampled signal Vdc, first compares
Device, which is used to receive, controls to adjust the alternating current reference signal i that device 291 is exportedrefWith the first inductance L21 current sampling signal
iL21, the second comparator, which is used to receive, controls to adjust the alternating current reference signal i that device 291 is exportedrefWith the second inductance L22 electricity
Flow sampled signal iL22, carrier signal generator 27 is used for outgoing carrier signal, and carrier signal includes but is not limited to sawtooth waveforms and three
Angle ripple, phase-shift circuit 28 is used to receive carrier signal and carries out phase shift to carrier signal.First current regulator 293 is used to receive
The Regulate signal of first comparator output, the second current regulator 292 is used for the Regulate signal for receiving the output of the second comparator.
Control to adjust device and receive alternating voltage sampled signal and DC voltage sampled signal, according to the difference of control purpose
Negative-feedback regu- lation is carried out, corresponding alternating current reference signal i is exportedref.The different control purposes include but is not limited to stabilization
Alternating voltage, stable DC voltage.
Current reference signal is compared with the first ac filter inductive current sampled signal to be carried out through the first current regulator afterwards
Negative feedback control, exports the first control signal Va1, and current reference signal is compared with the second ac filter inductive current sampled signal
Negative feedback control is carried out by the second current regulator, the second control signal Va2 is exported.
SPWM modulators 25 are used for the control signal Va1 and carrier signal vtr1 for receiving the output of the first current regulator 293.
SPWM modulators 26 are used to receive the phase shift that the control signal Va2 and phase-shift circuit 28 of the output of the second current regulator 292 are exported
Carrier signal vtr2.
Drive circuit 22 is used for the modulated signal for receiving the output of SPWM modulators 25,22 pair of first HF switch of drive circuit
3rd switching tube Q3 of bridge arm and the 4th switching tube Q4 are driven, and drive circuit 23 is used to receive the output of SPWM modulators 26
Modulated signal, the 5th switching tube Q5 and the 6th switching tube Q5 of 23 pair of second HF switch bridge arm of drive circuit are driven.
AC/DC convertor 3rd embodiment：
AC/DC convertor includes ac-dc conversion circuit and control unit, and ac-dc conversion circuit can be using above-described embodiment
In ac-dc conversion circuit, such as above-mentioned controlling party is realized when control unit is used to perform the computer program stored in memory
The step of method.Control unit can be CPU (Central Processing Unit, CPU), can also be other
General processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) or other PLDs, discrete gate or transistor logic device
Part, discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processing
Device etc..
Claims (10)
1. a kind of ac-dc conversion circuit, it is characterised in that opened including the first filter circuit, low frequency switch bridge arm, the first high frequency
Bridge arm and the second HF switch bridge arm are closed, first filter circuit is connected with the DC port of the ac-dc conversion circuit,
The low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm respectively with the DC port
It is connected in parallel；
The low frequency switch bridge arm includes first switch pipe and second switch pipe, the source electrode of the first switch pipe and described second
The drain electrode connection of switching tube；
The first HF switch bridge arm include the 3rd switching tube and the 4th switching tube, the source electrode of the 3rd switching tube with it is described
The drain electrode connection of 4th switching tube；
The second HF switch bridge arm include the 5th switching tube and the 6th switching tube, the source electrode of the 5th switching tube with it is described
The drain electrode connection of 6th switching tube；
The ac-dc conversion circuit also includes common mode inductance and the second filter circuit, the of the first winding of the common mode inductance
One Same Name of Ends is connected with the source electrode of the 3rd switching tube, the second Same Name of Ends of the second winding of the common mode inductance and described the
The source electrode connection of five switching tubes, the second Same Name of Ends of first winding, the first Same Name of Ends of second winding and described the
The source electrode of one switching tube is connected with second filter circuit, the friendship of second filter circuit and the ac-dc conversion circuit
Flow port is connected.
2. ac-dc conversion circuit according to claim 1, it is characterised in that：
Second filter circuit includes the first inductance and the first electric capacity, the first end of first inductance, first winding
The second Same Name of Ends and second winding the connection of the first Same Name of Ends, the second end of first inductance and first electric capacity
First end connection, the second end of first electric capacity is connected with the source electrode of the first switch pipe.
3. ac-dc conversion circuit according to claim 1, it is characterised in that：
Second filter circuit includes the first inductance, the second inductance and the first electric capacity, the first end of first inductance and institute
State the first Same Name of Ends company of the second Same Name of Ends connection of the first winding, the first end of second inductance and second winding
Connect, the connection of the first end at the second end of first inductance, the second end of second inductance and first electric capacity, described the
Second end of one electric capacity is connected with the source electrode of the first switch pipe.
4. a kind of ac-dc conversion circuit, it is characterised in that opened including the first filter circuit, low frequency switch bridge arm, the first high frequency
Bridge arm and the second HF switch bridge arm are closed, first filter circuit is connected with the DC port of the ac-dc conversion circuit,
The low frequency switch bridge arm, the first HF switch bridge arm and the second HF switch bridge arm respectively with the DC port
It is connected in parallel；
The low frequency switch bridge arm includes first switch pipe and second switch pipe, the source electrode of the first switch pipe and described second
The drain electrode connection of switching tube；
The first HF switch bridge arm include the 3rd switching tube and the 4th switching tube, the source electrode of the 3rd switching tube with it is described
The drain electrode connection of 4th switching tube；
The second HF switch bridge arm include the 5th switching tube and the 6th switching tube, the source electrode of the 5th switching tube with it is described
The drain electrode connection of 6th switching tube；
The ac-dc conversion circuit also includes the first inductance, the second inductance and the first electric capacity, the first end of first inductance
It is connected with the source electrode of the 3rd switching tube, the first end of second inductance is connected with the source electrode of the 5th switching tube, institute
State the second end of the first inductance, the second end of second inductance to be connected with the first end of first electric capacity, first electricity
The second end held is connected with the source electrode of the first switch pipe, and first electric capacity exchanges end with the ac-dc conversion circuit
Mouth is in parallel.
5. a kind of ac-dc conversion circuit, it is characterised in that including the first filter circuit, three-phase bridge arm component, first filter
Wave circuit is connected with the DC port of the ac-dc conversion circuit, the bridge arm component of each phase respectively with the DC terminal
Mouth is connected in parallel；
The bridge arm component of each phase includes：
The first HF switch bridge arm, including first switch pipe and second switch pipe, the source electrode of the first switch pipe and institute
State the drain electrode connection of second switch pipe；
The second HF switch bridge arm, including the 3rd switching tube and the 4th switching tube, the source electrode of the 3rd switching tube and institute
State the drain electrode connection of the 4th switching tube；
Common mode inductance, the first Same Name of Ends of the first winding of the common mode inductance is connected with the source electrode of the 3rd switching tube, institute
The second Same Name of Ends for stating the second winding of common mode inductance is connected with the source electrode of the first switch pipe, and the second of first winding
The output end connection of Same Name of Ends, the first Same Name of Ends of second winding and the bridge arm component；
The ac-dc conversion circuit also includes the second filter circuit, the output end of the bridge arm component of each phase respectively with institute
The connection of the second filter circuit is stated, second filter circuit is connected with the AC port of the ac-dc conversion circuit.
6. ac-dc conversion circuit according to claim 5, it is characterised in that：
Second filter circuit is AC three-phase LC wave filters, and the output end of the bridge arm component of each phase is respectively with exchanging
The input connection of three-phase LC wave filters.
7. a kind of AC/DC convertor, it is characterised in that including ac-dc conversion circuit and control unit, the ac-dc conversion
Circuit is the ac-dc conversion circuit described in the claims any one of 1-3, and described control unit includes：
Frequency plot identification circuit, for receiving alternating voltage sampled signal；
First drive circuit, the control signal for receiving the frequency plot identification circuit output, first drive circuit
The low frequency switch bridge arm is driven
Device is controlled to adjust, for receiving the alternating voltage sampled signal, alternating current sampled signal and DC voltage sampling letter
Number；
Carrier signal generator, for outgoing carrier signal；
Phase-shift circuit, for receiving the carrier signal；
First SPWM modulators, control signal and the carrier signal for receiving the control and regulation device output；
2nd SPWM modulators, for receiving the control signal of the control and regulation device output and the shifting of phase-shift circuit output
Phase carrier signal；
Second drive circuit, the modulated signal for receiving the first SPWM modulators output, second drive circuit pair
The first HF switch bridge arm is driven；
3rd drive circuit, the modulated signal for receiving the 2nd SPWM modulators output, the 3rd drive circuit pair
The second HF switch bridge arm is driven.
8. a kind of AC/DC convertor, including ac-dc conversion circuit and control unit, the ac-dc conversion circuit are above-mentioned
Ac-dc conversion circuit described in claim 4；
Described control unit includes：
Frequency plot identification circuit, for receiving alternating voltage sampled signal；
First drive circuit, the control signal for receiving the frequency plot identification circuit output, first drive circuit
The low frequency switch bridge arm is driven
Device is controlled to adjust, for receiving the alternating voltage sampled signal and DC voltage sampled signal；
First comparator, for receiving the alternating current reference signal of the control and regulation device output and the electricity of first inductance
Flow sampled signal；
Second comparator, for receiving the alternating current reference signal of the control and regulation device output and the electricity of second inductance
Flow sampled signal；
First current regulator, the Regulate signal for receiving the first comparator output；
Second current regulator, the Regulate signal for receiving the second comparator output；
Carrier signal generator, for outgoing carrier signal；
Phase-shift circuit, for receiving the carrier signal；
First SPWM modulators, control signal and the carrier signal for receiving first current regulator；
2nd SPWM modulators, control signal and phase-shift circuit output for receiving the second current regulator output
Phase shift carrier signal；
Second drive circuit, the modulated signal for receiving the first SPWM modulators output, second drive circuit pair
The first HF switch bridge arm is driven；
3rd drive circuit, the modulated signal for receiving the 2nd SPWM modulators output, the 3rd drive circuit pair
The second HF switch bridge arm is driven.
9. a kind of control method for ac-dc conversion circuit, it is characterised in that the ac-dc conversion circuit is above-mentioned power
Profit requires the ac-dc conversion circuit described in any one of 1-4；
The control method includes：
Control the first switch pipe and second switch pipe complementation conducting, the working frequency of the low frequency switch bridge arm and institute
The electric voltage frequency for stating AC port is identical, and the duty cycle of switching of the low frequency switch bridge arm is 50%, the first switch pipe it is dynamic
Make the voltage zero-cross timing synchronization at moment, the action moment of the second switch pipe and the AC port；
Control the 3rd switching tube and the 4th switching tube complementation conducting, the working frequency of the first HF switch bridge arm
For default HF switch frequency, the duty cycle of switching of the first HF switch bridge arm be according to alternating voltage sampled signal,
Alternating current sampled signal and DC voltage sampled signal calculate gained；
Control the 5th switching tube and the 6th switching tube complementation conducting, the working frequency of the second HF switch bridge arm
For default HF switch frequency, the duty cycle of switching of the second HF switch bridge arm be according to alternating voltage sampled signal,
Alternating current sampled signal, DC voltage sampled signal and phase signal calculate gained, and the phase signal is the described 3rd to open
Close the phase difference between the output signal of pipe and the output signal of the 5th switching tube.
10. a kind of AC/DC convertor, including ac-dc conversion circuit and control unit, described control unit are used to perform storage
The step of control method as claimed in claim 9 being realized during the computer program stored in device.
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| CN110971123A (en) * | 2018-09-28 | 2020-04-07 | 三垦电气株式会社 | Interleaved converter, control method thereof and interleaved power factor improving circuit |
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| CN110365244A (en) * | 2019-07-30 | 2019-10-22 | 湖北工业大学 | A kind of wrong frequency modulation method reducing single-phase photovoltaic grid-connected inverter THD |
| CN112821792A (en) * | 2021-02-23 | 2021-05-18 | 湖南大学 | Double-frequency staggered hybrid half-bridge circuit and control method thereof |
| CN112821792B (en) * | 2021-02-23 | 2022-04-01 | 湖南大学 | Double-frequency staggered hybrid half-bridge circuit and control method thereof |
| CN113037118A (en) * | 2021-03-04 | 2021-06-25 | 北京润科通用技术有限公司 | Multi-bridge-arm parallel current-sharing circuit and control method and device thereof |
| CN113938030A (en) * | 2021-09-26 | 2022-01-14 | 华为数字能源技术有限公司 | AC/DC converter and charging device |
| WO2023045756A1 (en) * | 2021-09-26 | 2023-03-30 | 华为数字能源技术有限公司 | Ac/dc converter and charging device |
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