CN107769592A - A kind of both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance - Google Patents
A kind of both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance Download PDFInfo
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- CN107769592A CN107769592A CN201711277567.3A CN201711277567A CN107769592A CN 107769592 A CN107769592 A CN 107769592A CN 201711277567 A CN201711277567 A CN 201711277567A CN 107769592 A CN107769592 A CN 107769592A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance, belong to field of power electronics.The both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance mainly include：First convertor circuit, the second convertor circuit, filter capacitor, control circuit and detection circuit；First convertor circuit includes the second power switch, the first inductance and the first diode；Second convertor circuit includes the 3rd power switch, the second inductance, the first power switch, the 4th diode, the second diode, the 3rd diode and flat wave capacitor.DC voltage and the line voltage of power network AC power that control circuit gathers according to detection circuit control the on and off of the first to the 3rd power switch.According to the present invention, joint grounding structure is used between AC and DC side, and only needs three power switch, there is high conversion efficiency, cost is low, DC side electric capacity of voltage regulation is small, exports the advantage such as DC voltage stability, practical.
Description
Technical field
The present invention relates to a kind of both ends shape of the mouth as one speaks AC/DC current transformers, more particularly to a kind of AC/DC unsteady flows based on coupling inductance
Device.
Background technology
AC/DC current transformers are mainly used in exchange caused by the alternating current or distributed generation system of AC network output
Electricity is transformed into the direct current needed for direct-current micro-grid.In the prior art, applied to direct-current micro-grid AC/DC current transformers ground connection side
Formula can be generally divided into joint grounding structure, unilateral ground structure, virtual isolation ground structure etc..
Fig. 1 gives the joint grounding structure of AC/DC current transformers in direct-current micro-grid.In the structure shown here, ac high-voltage is first
By splitting phase transformer T1110V AC low-tension is reduced to, then AC low-tension is accessed into AC/DC current transformers and carries out ac/dc turn
Change, finally provide power to direct-current micro-grid.Wherein, AC low-tension system and direct-current micro-grid share ground wire.Joint grounding structure
Advantage is that direct-current micro-grid can be easily mounted in original AC low-tension power network, so as to form hybrid power system.Mixed
Close in power system, low voltage equipment needs safe and reliable ground wire.But if without special or complicated AC/
DC current transformers provide ground wire, and most of low-voltage alternating-current system is not suitable for this structure.Simultaneously, it is desirable to which direct-current micro-grid must be applicable
Bipolar voltage mapped structure in three ports.
Conventionally, as being limited by low-voltage equipment, direct-current micro-grid and the shared ground wire of low-voltage alternating-current system are tired
Difficult.So many scholars take into account unilateral ground structure.Fig. 2 shows unilateral with double DC trunk in direct-current micro-grid
Ground structure.In this configuration, ac high-voltage passes through step-down transformer T2It is transformed into the exchange of suitable AC/DC current transformers input
Low pressure, then provide power to direct-current micro-grid by AC/DC current transformers.Here step-down transformer T2Similar to isolating transformer,
And it is that alternating current of the alternating voltage of direct-current micro-grid offer generally than standard forces down.A such as triphase step-down transformer
200V line voltage, rather than the 380V line voltages of a standard may be exported.In addition, according to direct voltage output work(
The needs of rate and rated power, AC/DC current transformers can be converted into AC power the dc power of different requirements.Such as directly
Flow the system that microgrid is probably a single DC master row, or the system of double DC trunk.
The advantages of this unilateral ground structure is that AC/DC current transformers can use the current transformer of simple structure, such as two level
3-phase power converter, or the 3-phase power converter of three level, or other current transformers.Shortcoming is the output of step-down transformer
It can not be joined directly together with the civilian load of other low-voltage alternating-currents, so the adaptability of direct-current micro-grid can be restricted.
In the prior art, because the presence of low-voltage equipment, to realize that ground wire is mixing AC and DC network system altogether
It is very difficult.Therefore, scholar proposes virtual isolation ground structure.As shown in Figure 3 a-3b, according to transformer type not
Together, virtually isolation ground structure can be generally divided into two classes.
Fig. 3 a are illustrated that based on Industrial Frequency Transformer T3Virtual isolation ground structure.The structure and unilateral ground structure phase
Seemingly, but transformer and low-voltage alternating-current power system connect herein, rather than high-voltage alternating system.Fig. 3 b are illustrated that based on height
Frequency power transformer T4Virtual isolation ground structure.Compared with the method shown in Fig. 3 a, high frequency transformer T has been used in Fig. 3 b4With two
Current transformer.Because wherein current transformer has higher conversion efficiency, so the high frequency transformer based on this method is with respect to power frequency
It is more advantageous for voltage transformer system.
Virtually although isolation earthing mode can extremely flexibly adapt to the needs of direct-current micro-grid structure, the change used in it
Depressor and multiple current transformers with extra power attenuation, can reduce the conversion efficiency of whole system.
In direct-current micro-grid, if using virtual isolation ground structure connection AC electric power systems, system can be reduced
Conversion efficiency.If using unilateral ground structure, the adaptability of direct-current micro-grid can be restricted.So in the prior art,
A kind of AC/DC current transformers of joint grounding structure are given, as shown in Figure 4.The AC/DC current transformers have efficient, low cost, peace
The advantages of complete reliable.But there is also defect for the AC/DC current transformers.Such as due in the positive half cycle of power frequency or power frequency negative half period only
There are the first convertor circuit or the work of the second convertor circuit, it is therefore desirable in the flat ripple electricity that output one capacity of DC side parallel is larger
Hold, so that output DC voltage keeps basicly stable.Simultaneously as the first power output and the second power output are equal, if
The power difference that two DC loads of DC output end absorb is connected on, then the first output DC voltage E1With the second output direct current
Voltage E2Be difficult to keep balance, and then the requirement of DC load stabilized input voltage can not be met.Please refer to Fig. 5 and figure
6, it is respectively BUCK (decompression) working state figures and BOOST (boosting) work shapes of the AC/DC current transformers of the joint grounding structure
State figure.If it is intended to solving the above problems, it must just increase a dc-voltage balance adjustment electricity in the circuit shown in Fig. 4
Road, so as to add cost.
The shortcomings that for AC/DC current transformers shown in Fig. 4 in the prior art, it is necessary to propose a kind of new A C/DC unsteady flows
Device.
The content of the invention
It is an object of the invention to propose a kind of safe, reliable, efficient AC/DC current transformers.
Both ends shape of the mouth as one speaks AC/DC current transformers provided by the invention based on coupling inductance, including：First convertor circuit, second
Convertor circuit, filter capacitor, control circuit and detection circuit；
First convertor circuit includes the second power switch, the first inductance and the first diode；The exchange of current transformer is defeated
Enter the first end that end is connected to the first inductance by the first diode, the second end of the first inductance is connect by the second power switch
Ground；
Second convertor circuit includes the 3rd power switch, the second inductance, the first power switch, the 4th diode, the
Two diodes, the 3rd diode and flat wave capacitor；Current transformer is connected to after 4th diode and the 3rd the power switch series connection
Ac input end and the second inductance the second end between；Second end of second inductance is also grounded by the second diode；
The first end of second inductance is grounded by the first power switch；The first end of second inductance is also connected to directly by the 3rd diode
Flow output end；Flat wave capacitor is connected in parallel between DC output end and ground；
First inductance is mutually coupled with the second inductance, and the first end of the first inductance and the first end of the second inductance
For Same Name of Ends；
The filter capacitor is used to be filtered the alternating current of the first convertor circuit of input and the second convertor circuit；
The detection circuit is used for the DC voltage for detecting DC output end output, and the power network electricity of power network AC power
Pressure, and feed back to the control circuit；
The control circuit is used to send switch controlling signal to institute according to the DC voltage and line voltage of detection
The first power switch is stated to the controlled end of the 3rd power switch, to control by first convertor circuit and the second convertor circuit structure
Into convertor circuit be operated in flyback, boosting and the mode of operation of decompression.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that the control
Circuit controls the convertor circuit to be operated in flyback mode in the positive half cycle of power frequency, is higher than institute in power frequency negative half period and DC voltage
The convertor circuit is controlled to be operated in boost mode during the absolute value for stating line voltage instantaneous value, in power frequency negative half period and direct current
Force down and control the convertor circuit to be operated in decompression mode when the absolute value of the line voltage instantaneous value；Or the control
Circuit controls the convertor circuit to be operated in flyback mode in power frequency negative half period, is higher than institute in the positive half cycle of power frequency and DC voltage
The convertor circuit is controlled to be operated in boost mode during the absolute value for stating line voltage instantaneous value, in the positive half cycle of power frequency and direct current
Force down and control the convertor circuit to be operated in decompression mode when the absolute value of the line voltage instantaneous value.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described first
The anode of diode is connected with ac input end, and negative electrode is connected with the first end of the first inductance；The anode of second diode
It is connected with the second end of the second inductance, minus earth；The anode of 3rd diode is connected with DC output end, negative electrode and
The first end connection of two inductance；The negative electrode of 4th diode is connected with ac input end, and anode and the 3rd power switch connect
Connect.Therefore, control circuit is when it is determined that DC voltage is higher than the absolute value of line voltage instantaneous value：In the positive half cycle of power frequency, make
Second power switch high-frequency work, the 3rd and first power switch disconnect；In power frequency negative half period, close the 3rd power switch
Close, the first power switch high-frequency work, the second power switch disconnects.Control circuit is it is determined that DC voltage is less than line voltage wink
During the absolute value of duration：In the positive half cycle of power frequency, make the second power switch high-frequency work, the 3rd and first power switch disconnect；
In power frequency negative half period, make the 3rd power switch high-frequency work, the second and first power switch disconnects.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described first
The negative electrode of diode is connected with ac input end, and anode is connected with the first end of the first inductance；The negative electrode of second diode
It is connected with the second end of the second inductance, plus earth；The negative electrode of 3rd diode is connected with DC output end, anode and
The first end connection of two inductance；The anode of 4th diode is connected with ac input end, and negative electrode and the 3rd power switch connect
Connect.Correspondingly, control circuit is when it is determined that DC voltage is higher than the absolute value of line voltage instantaneous value：In power frequency negative half period,
Make the second power switch high-frequency work, the 3rd and first power switch disconnect；In the positive half cycle of power frequency, close the 3rd power switch
Close, the first power switch high-frequency work, the second power switch disconnects.Control circuit is it is determined that DC voltage is less than line voltage wink
During the absolute value of duration：In power frequency negative half period, make the second power switch high-frequency work, the 3rd and first power switch disconnect；
In the positive half cycle of power frequency, make the 3rd power switch high-frequency work, the second and first power switch disconnects.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described to be based on
The both ends shape of the mouth as one speaks AC/DC current transformers of coupling inductance also include being connected between the power network AC power and the ac input end
The 3rd inductance.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described first
Power switch to the 3rd power switch is MOS type FET, insulated gate bipolar transistor or integrated gate commutated thyristor.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described first
Diode and the 4th diode are substituted by MOS type FET, insulated gate bipolar transistor or integrated gate commutated thyristor.
According in the both ends shape of the mouth as one speaks AC/DC current transformers of the present invention based on coupling inductance, it is preferable that described first
Diode and the second power switch are integrated into entirety, and the 4th diode and the 3rd power switch are integrated into entirety, exhausted by inverse-impedance type
Edge grid bipolar transistor is replaced.
The both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance of the present invention, the first inductance and the second inductance are subjected to coupling
Close, and the state of the first to the 3rd power switch be controlled according to VD, line voltage by control circuit,
So that the DC voltage of convertor circuit output keeps stable.Three switch power devices are used only in the AC/DC current transformers of the present invention
Part, reduce the cost of system.
Brief description of the drawings
By that will become more and the specific embodiment part provided, the features and advantages of the present invention referring to the drawings
It is readily appreciated that, in the accompanying drawings：
Fig. 1 is the joint grounding structure of prior art AC/DC current transformers；
Fig. 2 is the unilateral ground structure of prior art AC/DC current transformers；
Fig. 3 a are the virtual isolation ground structure based on Industrial Frequency Transformer of prior art AC/DC current transformers；
Fig. 3 b are the virtual isolation ground structure based on high frequency transformer of prior art AC/DC current transformers；
Fig. 4 is a kind of AC/DC current transformers of joint grounding structure of prior art；
Fig. 5 is a kind of decompression working state figure of the AC/DC current transformers of joint grounding structure of prior art；
Fig. 6 is a kind of boosting working state figure of the AC/DC current transformers of joint grounding structure of prior art；
Fig. 7 is the convertor circuit of the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance of first embodiment of the invention
Schematic diagram；
Fig. 8 be first embodiment of the invention the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance control circuit and
Detect the schematic diagram of circuit；
Fig. 9 is the convertor circuit of the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance of second embodiment of the invention
Schematic diagram；
100th, the first convertor circuit；200th, the second convertor circuit；300th, circuit is detected；400th, control circuit；S1, the first work(
Rate switchs；D1, the first diode；L1, the first inductance；S2, the second power switch；D2, the second diode；D3, the 3rd diode；C、
Flat wave capacitor；R, Equivalent DC loads；S3, the 3rd power switch；L2, the second inductance；D4, the 4th diode；Lg, the 3rd inductance；
Cf, filter capacitor.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained on the premise of creative work is not made, belongs to the scope of protection of the invention.
For in the prior art be applied to direct-current micro-grid AC/DC current transformer ground structures the defects of, in particular for Fig. 4
The defects of AC/DC current transformers of shown joint grounding structure are present, the invention provides a kind of both ends based on coupling inductance
Shape of the mouth as one speaks AC/DC current transformers.The main thought of the present invention is, by the first inductance and the second convertor circuit in the first convertor circuit
The second inductance coupled, and the first end of the first end of the first inductance and the second inductance is Same Name of Ends；Then control electricity
The DC voltage E and line voltage V that road obtains according to detection electric circuit inspectiong, the state of the first to the 3rd power switch is entered
Row control, so as to so that the DC voltage stability of output is reliable.
Embodiments of the invention are described in detail 7-8 below in conjunction with the accompanying drawings.Fig. 7 and Fig. 8 respectively illustrate the present invention
The convertor circuit and control section schematic diagram of the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance of first embodiment.This hair
The AC/DC current transformers of bright first embodiment comprise at least：First convertor circuit 100, the second convertor circuit 200, filter capacitor Cf、
Detect circuit 300 and control circuit 400.First convertor circuit 100 and the second convertor circuit 200 form total convertor circuit.
First convertor circuit 100 includes the first inductance L1, the second power switch S2With the first diode D1.The friendship of current transformer
Stream input passes through the first diode D1It is connected to the first inductance L1First end, the first inductance L1The second end pass through the second work(
Rate switchs S2Ground connection.Preferably, in this first embodiment, the first diode D1Anode and exchanging for power network AC power it is defeated
Enter end connection, the first diode D1Negative electrode and the first inductance L1First end be connected.
Second convertor circuit 200 includes the 3rd power switch S3, the second inductance L2, the first power switch S1, the 4th diode
D4, the second diode D2, the 3rd diode D3With flat wave capacitor C.R loads for Equivalent DC in Fig. 7.4th diode D4With
Three power switch S3The ac input end and the second inductance L of current transformer are connected to after series connection2The second end between.Second inductance L2
The second end also pass through the second diode D2Ground connection.Second inductance L2First end pass through the first power switch S1Ground connection, the second electricity
Feel L2First end also pass through the 3rd diode D3It is connected to DC output end.Flat wave capacitor C is connected in parallel on DC output end and ground
Between.Preferably, in this first embodiment, the second diode D2Anode and the second inductance L2The second end connection, the two or two pole
Pipe D2Minus earth；3rd diode D3Anode be connected with DC output end, the 3rd diode D3Negative electrode and the second inductance
L2First end connection；4th diode D4Negative electrode be connected with ac input end, the 4th diode D4Anode and the 3rd power
Switch S3Connection.
First inductance L1With the second inductance L2It is mutually coupled, and the first inductance L1First end and the second inductance L2
One end is Same Name of Ends.
The ac input end of current transformer is connected with one end of power network AC power, the other end ground connection of power network AC power.
Filter capacitor Cf, for being filtered to the alternating current of the first convertor circuit 100 of input and the second convertor circuit 200.Preferably,
AC/DC current transformers in the embodiment of the present invention also include being connected between power network AC power and the ac input end of current transformer
3rd inductance Lg.Filter capacitor CfOne end be connected with ac input end, one end ground connection.
Detection circuit 300 is used to detect the convertor circuit i.e. DC voltage E of DC output end output, and power network alternating current
The line voltage V in sourceg, and by the DC voltage E and line voltage V of detectiongSend to control circuit 400.
Control circuit 400 is used for the DC voltage E and line voltage V detected according to detection circuit 300gTo current work
Pattern judges, the to first to the 3rd power switch S1~S3Controlled end send switch controlling signal, to control convertor circuit
It is operated in flyback, boosting and the mode of operation of decompression.Preferably, the detection circuit 300 is additionally operable to detect power network AC power
Power network output current ig, and it is sent to control circuit 400.Control circuit 400 is additionally operable to root when sending switch controlling signal
The dutycycle of switch controlling signal is determined according to circuit parameter.Specifically, control circuit 400 is used for what is exported according to DC output end
DC voltage E and reference DC voltage ErefIt is compared, gives its error to DC voltage outer ring controller；Outside DC voltage
The output result of ring controller is multiplied by a sinusoidal signal again and the power network output current i that feeds back togIt is compared, by its error
Give ring controller in alternating current；Last control circuit 400 determines to open according to the output result of ring controller in alternating current
Close the dutycycle of control signal.
In the first embodiment, control circuit 400 controls convertor circuit to be operated in flyback mode in the positive half cycle of power frequency,
Power frequency negative half period and DC voltage E is higher than the line voltage VgInstantaneous value absolute value when control convertor circuit be operated in liter
Die pressing type, in the absolute value for the instantaneous value that power frequency negative half period and DC voltage are less than line voltage, control convertor circuit is operated in
Decompression mode.
Specifically, control circuit 400 is when determination DC voltage E is higher than (containing being equal to) line voltage VgInstantaneous value it is absolute
Following operate is carried out during value：
In the positive half cycle of power frequency, the first convertor circuit 100 is worked in flyback mode, specifically include：Second power switch
S2High-frequency work, the 3rd power switch S3With the first power switch S1Disconnect；In power frequency negative half period, make the second convertor circuit 200
Boost mode is worked in, is specifically included：Make the 3rd power switch S3Closure, the first power switch S1High-frequency work, the second power are opened
Close S2Disconnect.
Control circuit 400 is less than line voltage V as determination DC voltage EgInstantaneous value absolute value when carry out following grasp
Make：
In the positive half cycle of power frequency, the first convertor circuit 100 is worked in flyback mode, specifically include：Second power switch
S2High-frequency work, the 3rd power switch S3With the first power switch S1Disconnect；In power frequency negative half period, make the second convertor circuit 200
Decompression mode is worked in, is specifically included：3rd power switch S3High-frequency work, the second power switch S2With the first power switch S1
Disconnect.
In the embodiment of the present invention, in the positive half cycle of power frequency, the 3rd power switch S3With the first power switch S1Disconnect.Pass through
In the first inductance L1The energy storage stage close the second power switch S2So that power network AC power and the first inductance L1Form closure
Loop, and then strengthen the energy storage in coupling inductance.And in the first inductance L1Release can the stage, disconnect the second power switch S2,
Make to be stored in the energy in coupling inductance is supplied to Equivalent DC to load R in a manner of flyback.Control, ensure more than
The stability of AC/DC current transformer DC load both end voltages.
In the embodiment of the present invention, by the way that the first inductance is coupled with the second inductance, obtained by detecting electric circuit inspection
The DC voltage of convertor circuit output, the state of the first to the 3rd power switch is then controlled by control circuit, so as to
The normal operation of AC/DC current transformers is ensured under various operating modes.The both ends shape of the mouth as one speaks AC/DC current transformers of the present invention are compared with prior art
For, because required number of devices is few, and joint grounding structure is used, had both reduced cost and the ripple rate of DC voltage,
The security of AC/DC current transformers is improved again.
In the embodiment of the present invention, the first to the 3rd power switch can use MOS type FET (MOSFET), insulated gate
Bipolar transistor (IGBT) or integrated gate commutated thyristor (IGCT) etc. are realized.Preferably, the first power switch S1Extremely
3rd power switch S3Use N-channel MOS type FET (MOSFET).By using MOS type FET as switch
Device, it can further reduce conduction loss.
In this embodiment, the first diode D1With the second power switch S2Physical location, the 4th diode D4With the 3rd
Power switch S3Physical location can exchange.First diode D1With the second power switch S2It is integrated into entirety, the 4th diode
D4With the 3rd power switch S3Entirety is integrated into, an inverse-impedance type insulated gate bipolar transistor can also be used to replace, Ke Yijin
One step reduces the number of device.First diode D1With the 4th diode D4Corresponding MOS type FET can be used
(MOSFET), insulated gate bipolar transistor (IGBT) or integrated gate commutated thyristor (IGCT) replace, for example with N ditches
Road MOS type FET replaces, further to reduce conduction loss.
As shown in figure 9, it is unsteady flow in the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance of second embodiment of the invention
The schematic diagram of circuit.The second embodiment provides another topological structure.Compared with Fig. 7, in addition to polarity of voltage is different, its
Operation principle and mode of operation are identical with Fig. 7.It is in place of difference, wherein it is preferred to, in this second embodiment, the one or two
Pole pipe D1Negative electrode be connected with ac input end, anode and the first inductance L1First end connection；Second diode D2Negative electrode with
Second inductance L2The second end connection, the second diode D2Plus earth；3rd diode D3Negative electrode and DC output end connect
Connect, the 3rd diode D3Anode and the second inductance L2First end connection；4th diode D4Anode and ac input end connect
Connect, the 4th diode D4Negative electrode and the 3rd power switch S3Connection.
In this second embodiment, correspondingly, control circuit 400 controls convertor circuit to be operated in instead in power frequency negative half period
Energizing mode, it is higher than the line voltage V in the positive half cycle of power frequency and DC voltage EgInstantaneous value absolute value when control unsteady flow electricity
Road is operated in boost mode, is less than line voltage V in the positive half cycle of power frequency and DC voltage EgInstantaneous value absolute value when control
Convertor circuit is operated in decompression mode.
Specifically, control circuit 400 is when determination DC voltage E is higher than (containing being equal to) line voltage VgInstantaneous value it is absolute
Following operate is carried out during value：
In power frequency negative half period, the first convertor circuit 100 is worked in flyback mode, specifically include：Second power switch
S2High-frequency work, the 3rd power switch S3With the first power switch S1Disconnect；In the positive half cycle of power frequency, make the second convertor circuit 200
Boost mode is worked in, is specifically included：Make the 3rd power switch S3Closure, the first power switch S1High-frequency work, the second power are opened
Close S2Disconnect.
Control circuit 400 is less than line voltage V as determination DC voltage EgInstantaneous value absolute value when carry out following grasp
Make：
In power frequency negative half period, the first convertor circuit 100 is worked in flyback mode, specifically include：Second power switch
S2High-frequency work, the 3rd power switch S3With the first power switch S1Disconnect；In the positive half cycle of power frequency, make the second convertor circuit 200
Decompression mode is worked in, is specifically included：3rd power switch S3High-frequency work, the second power switch S2With the first power switch S1
Disconnect.
In summary, joint grounding structure is used between AC and DC side of the invention, and only needs three power to open
Close, there is high conversion efficiency, cost is low, DC side electric capacity of voltage regulation is small, exports the advantage such as DC voltage stability, practical.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
- A kind of 1. both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance, it is characterised in that the both ends based on coupling inductance Shape of the mouth as one speaks AC/DC current transformers include：First convertor circuit, the second convertor circuit, filter capacitor, control circuit and detection circuit；First convertor circuit includes the second power switch, the first inductance and the first diode；The ac input end of current transformer The first end of the first inductance is connected to by the first diode, the second end of the first inductance is grounded by the second power switch；Second convertor circuit includes the 3rd power switch, the second inductance, the first power switch, the 4th diode, the two or two Pole pipe, the 3rd diode and flat wave capacitor；The friendship of current transformer is connected to after 4th diode and the 3rd the power switch series connection Flow between input and the second end of the second inductance；Second end of second inductance is also grounded by the second diode；Second The first end of inductance is grounded by the first power switch；It is defeated that the first end of second inductance is also connected to direct current by the 3rd diode Go out end；Flat wave capacitor is connected in parallel between DC output end and ground；First inductance is mutually coupled with the second inductance, and the first end of the first inductance and the first end of the second inductance are same Name end；The filter capacitor is used to be filtered the alternating current of the first convertor circuit of input and the second convertor circuit；The detection circuit is used for the DC voltage for detecting DC output end output, and the line voltage of power network AC power, And feed back to the control circuit；The control circuit is used to send switch controlling signal to described the according to the DC voltage and line voltage of detection The controlled end of one power switch to the 3rd power switch, it is made up of with control first convertor circuit and the second convertor circuit Convertor circuit is operated in flyback, boosting and the mode of operation of decompression.
- 2. the both ends shape of the mouth as one speaks AC/DC current transformers according to claim 1 based on coupling inductance, it is characterised in that：The control circuit controls the convertor circuit to be operated in flyback mode in the positive half cycle of power frequency, in power frequency negative half period and directly Stream voltage controls the convertor circuit to be operated in boost mode when being higher than the absolute value of the line voltage instantaneous value, is born in power frequency Half cycle and DC voltage control the convertor circuit to be operated in decompression mode when being less than the absolute value of the line voltage instantaneous value； OrThe control circuit controls the convertor circuit to be operated in flyback mode in power frequency negative half period, in the positive half cycle of power frequency and directly Stream voltage controls the convertor circuit to be operated in boost mode when being higher than the absolute value of the line voltage instantaneous value, in power frequency just Half cycle and DC voltage control the convertor circuit to be operated in decompression mode when being less than the absolute value of the line voltage instantaneous value.
- 3. the both ends shape of the mouth as one speaks AC/DC current transformers according to claim 2 based on coupling inductance, it is characterised in that described The anode of one diode is connected with ac input end, and negative electrode is connected with the first end of the first inductance；The sun of second diode Pole is connected with the second end of the second inductance, minus earth；The anode of 3rd diode is connected with DC output end, negative electrode with The first end connection of second inductance；The negative electrode of 4th diode is connected with ac input end, anode and the 3rd power switch Connection.
- 4. the both ends shape of the mouth as one speaks AC/DC current transformers according to claim 3 based on coupling inductance, it is characterised in that：The control circuit is when it is determined that DC voltage is higher than the absolute value of line voltage instantaneous value：In the positive half cycle of power frequency, make Second power switch high-frequency work, the 3rd and first power switch disconnect；In power frequency negative half period, close the 3rd power switch Close, the first power switch high-frequency work, the second power switch disconnects；The control circuit is when it is determined that DC voltage is less than the absolute value of line voltage instantaneous value：In the positive half cycle of power frequency, make Second power switch high-frequency work, the 3rd and first power switch disconnect；In power frequency negative half period, make the 3rd power switch high frequency Work, the second and first power switch disconnect.
- 5. the both ends shape of the mouth as one speaks AC/DC current transformers according to claim 2 based on coupling inductance, it is characterised in that described The negative electrode of one diode is connected with ac input end, and anode is connected with the first end of the first inductance；The moon of second diode Pole is connected with the second end of the second inductance, plus earth；The negative electrode of 3rd diode is connected with DC output end, anode with The first end connection of second inductance；The anode of 4th diode is connected with ac input end, negative electrode and the 3rd power switch Connection.
- 6. the both ends shape of the mouth as one speaks AC/DC current transformers according to claim 5 based on coupling inductance, it is characterised in that：The control circuit is when it is determined that DC voltage is higher than the absolute value of line voltage instantaneous value：In power frequency negative half period, make Second power switch high-frequency work, the 3rd and first power switch disconnect；In the positive half cycle of power frequency, close the 3rd power switch Close, the first power switch high-frequency work, the second power switch disconnects；The control circuit is when it is determined that DC voltage is less than the absolute value of line voltage instantaneous value：In power frequency negative half period, make Second power switch high-frequency work, the 3rd and first power switch disconnect；In the positive half cycle of power frequency, make the 3rd power switch high frequency Work, the second and first power switch disconnect.
- 7. according to the both ends shape of the mouth as one speaks AC/DC current transformers according to any one of claims 1 to 6 based on coupling inductance, its feature It is, the both ends shape of the mouth as one speaks AC/DC current transformers based on coupling inductance also include being connected to the power network AC power and described The 3rd inductance between ac input end.
- 8. according to the both ends shape of the mouth as one speaks AC/DC current transformers according to any one of claims 1 to 6 based on coupling inductance, its feature It is, first power switch to the 3rd power switch is MOS type FET, insulated gate bipolar transistor or integrated door Pole commutated thyristor.
- 9. according to the both ends shape of the mouth as one speaks AC/DC current transformers according to any one of claims 1 to 6 based on coupling inductance, its feature It is, first diode and the 4th diode are changed by MOS type FET, insulated gate bipolar transistor or integral gate IGCT is flowed to substitute.
- 10. according to the both ends shape of the mouth as one speaks AC/DC current transformers according to any one of claims 1 to 6 based on coupling inductance, its feature It is, first diode and the second power switch are integrated into entirety, and the 4th diode and the 3rd power switch are integrated into whole Body, replaced by inverse-impedance type insulated gate bipolar transistor.
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| CN112993971A (en) * | 2021-03-12 | 2021-06-18 | 清华大学 | Bipolar bidirectional DC-DC converter with function of inhibiting direct-current voltage unbalance |
| CN112993970A (en) * | 2021-03-12 | 2021-06-18 | 清华大学 | Bipolar bidirectional boost-buck DC-DC converter with function of inhibiting direct-current voltage unbalance |
| CN113472055A (en) * | 2021-06-25 | 2021-10-01 | 中国电子科技集团公司第十八研究所 | High-integration three-port power converter |
| CN117613667A (en) * | 2024-01-23 | 2024-02-27 | 湘潭无线电有限责任公司 | Laser pulse diode driver power supply control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112993971A (en) * | 2021-03-12 | 2021-06-18 | 清华大学 | Bipolar bidirectional DC-DC converter with function of inhibiting direct-current voltage unbalance |
| CN112993970A (en) * | 2021-03-12 | 2021-06-18 | 清华大学 | Bipolar bidirectional boost-buck DC-DC converter with function of inhibiting direct-current voltage unbalance |
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| CN112993970B (en) * | 2021-03-12 | 2022-09-09 | 清华大学 | Bipolar bidirectional boost-buck DC-DC converter with function of inhibiting direct-current voltage unbalance |
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| CN117613667A (en) * | 2024-01-23 | 2024-02-27 | 湘潭无线电有限责任公司 | Laser pulse diode driver power supply control circuit |
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| CN107769592B (en) | 2019-07-09 |
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