CN105406722A - High-voltage direct-current transformer connected with diode clamping power switch in series - Google Patents
High-voltage direct-current transformer connected with diode clamping power switch in series Download PDFInfo
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- CN105406722A CN105406722A CN201510958920.9A CN201510958920A CN105406722A CN 105406722 A CN105406722 A CN 105406722A CN 201510958920 A CN201510958920 A CN 201510958920A CN 105406722 A CN105406722 A CN 105406722A
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- power switch
- voltage
- topological structure
- diode
- road
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Classifications
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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
- 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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a high-voltage direct-current transformer connected with a diode clamping power switch in series, belonging to the technical field of electrical and electronic applications. The high-voltage direct-current transformer connected with the diode clamping power switch in series can be applied to direct direct-current electric energy voltage grade transformation in a high-voltage high-power occasion, such as direct-current transmission. The invention discloses a high-voltage direct-current transformer connected with a unilateral diode clamping power switch in series; a topological structure included in the invention is used for enabling voltage between capacitors included in the topological structure to be balanced and enabling voltage between power switches to be balanced; and simultaneously, the topological structure is used respectively in combination with auxiliary circuits, such that voltage at two ends of the power switches included in the topological structure can be limited. To realize bidirectional transformation of direct-current voltage of the direct-current transformer, the invention further discloses a high-voltage direct-current transformer connected with a bidirectional diode clamping power switch in series; and the technical problem to be solved by the invention is to provide the high-voltage direct-current transformer connected with the diode clamping power switch in series, which can enable voltage at two ends of the serial power switches to be balanced, limit voltage at two ends of the power switches, and satisfy high-voltage high-power application.
Description
Technical field
The present invention relates to diode clamp power switch series high voltage DC transformer, particularly relate to the diode clamp power switch series high voltage DC transformer for DC converting, can be applicable to the direct direct current energy electric pressure conversion of the high pressure large-power occasions such as direct current transportation, belong to applied power electronics technical field.
Background technology
Compared with ac transmission, high voltage direct current transmission has the features such as transmission power capacity is large, loss is little, fed distance is far away, good stability, and it has broad application prospects.Rectification side and inverter side in HVDC (High Voltage Direct Current) transmission system, still want the Industrial Frequency Transformer that volume is large, quality is large to realize being connected with AC network at present.Direct current transportation still as a kind of miscellaneous function of ac transmission, is not directly used in power consumption equipment.Along with the development of HVDC Transmission Technology and generation of electricity by new energy technology, direct current transmission and distribution will run with AC network simultaneously, in order to adapt in the future DC network to be directly applied to power consumption equipment, especially to isolated power systems such as large scale non-grid connected wind power generations, former scheme just seems heavy and uneconomical.Need that there is the functionally similar direct current transformation device with AC transformer, high voltage direct current is converted to the direct current energy meeting the different electric pressures that power consumption equipment requires of isolation.
Novel transformer-the electric power electric transformer (PET) being realized voltage transformation and energy transferring by Technics of Power Electronic Conversion technology obtains increasing concern, and commutator transformer is exactly one wherein.Commutator transformer works under close to the equivalent duty ratio of 100%, and export and eliminate filter inductance, structure is simple; Adopt opened loop control, be easy to realize Sofe Switch, can further improve switching frequency, improve power density.
Because the electric pressure of the occasions such as direct current transportation is higher, Capacity Ratio is comparatively large, the electric pressure of commutator transformer improving constantly, power also constantly increases, and to the voltage withstand class of used power switch and the requirement of power grade also more and more higher.Power switch series direct current transformation device is the important method realizing high-power commutator transformer, and the key of power switch series direct current transformation device, be ensure the power switch both end voltage U in circuit
cEequilibrium, prevent power switch from damaging because there is overvoltage.Electric voltage equalization mainly comprises static state voltage equipoise and dynamic voltage balancing two parts.Static state voltage equipoise, refers to each power switch both end voltage U
cEbalance is kept under power switch is opened stable state and turned off stable state; Dynamic voltage balancing, refers to each power switch both end voltage U
cEturn on and off at power switch and keep the balance of voltage instantaneously.All pressures of series power switch depend on several factors, the parasitic capacitance of such as main circuit stray capacitance, gate-drive, power switch parasitic parameter and gate-drive control signal etc.When the manufacturer of used power switch is identical, other parameters are substantially identical, and now gate electrode drive signals is asynchronous becomes the factor had the greatest impact.The asynchronous meeting of gate electrode drive signals causes device delayed in opening process producing due to voltage spikes and higher quiescent voltage, causes each power switching voltage unbalanced.The asynchronous degree of gate electrode drive signals, depends on control circuit and the transmission line between control circuit and gate-drive, and therefore its asynchronous degree is difficult to expect in advance.Gate electrode drive signals is asynchronous was generally for tens nanoseconds to hundreds of nanosecond.Even and if series power switch commutator transformer will ensure to exist between each power switch gate electrode drive signals of connecting asynchronously also normally to run.
Therefore, for this requirement, design can from the high-pressure series power switch commutator transformer of all pressing, and circuit structure is succinct, and control strategy is simple, and all pressures of power switch are effective, are the feasible way realizing high-power commutator transformer.
Summary of the invention
Diode clamp power switch series high voltage DC transformer disclosed by the invention, a kind of unilateral diode clamper power switch series high voltage DC transformer and a kind of bidirectional diode clamper power switch series high voltage DC transformer can be divided into, it is balanced that the technical problem solved is to provide the both end voltage that can realize series power switch, and power-limiting switch ends voltage, meet the diode clamp power switch series high voltage DC transformer of high-power application.
Described a kind of bidirectional diode clamper power switch series high voltage DC transformer also soluble technical problem is the two-way transformation realizing direct voltage.
A kind of unilateral diode clamper power switch series high voltage DC transformer disclosed by the invention, comprises input side dc-link capacitance C
in, capacitance C
0, high frequency transformer Tr, single-phase rectification bridge REC, outlet side dc-link capacitance C
outand auxiliary circuit, described auxiliary circuit is divided into A road auxiliary circuit and B road auxiliary circuit.A kind of unilateral diode clamper power switch series high voltage DC transformer disclosed by the invention, also comprise the single channel topological structure (A, B) of two-way parallel connection, be respectively A road topological structure and B road topological structure, described single topological structure (A, B) for topological structure is comprised electric capacity between electric voltage equalization and make between power switch electric voltage equalization, the topological structure (A, B) is simultaneously combined the power switch both end voltage that can realize limiting topological structure and comprise respectively with auxiliary circuit (A, B).Described single channel topological structure (A, B) is made up of even number diode clamp power switch series average-voltage units in series, and described single diode clamp power switch series average-voltage unit comprises power switch T
i(1≤i≤2n), clamp diode D
i1(1≤i≤2n), clamp capacitor C
i(1≤i≤2n) and sustained diode
i2(2≤i≤2n), power switch T
ithe collector electrode of (1≤i≤2n) and clamp capacitor C
ithe one end of (1≤i≤2n) is connected, clamp capacitor C
ithe other end of (1≤i≤2n) and clamp diode D
i1the anode of (1≤i≤2n) is connected, clamp diode D
i1the negative electrode of (1≤i≤2n) and power switch T
ithe emitter of (1≤i≤2n) is connected, sustained diode
i2the anode of (2≤i≤2n) and clamp diode D
i1the anode of (1≤i≤2n) is connected.When forming single channel topological structure (A, B), first diode clamp power switch series average-voltage unit is only by power switch T
1, clamp diode D
11with clamp capacitor C
1composition.Two diode clamp power switch series average-voltage unit composition diode clamp power switch series average-voltage unit groups adjacent in single channel topological structure (A, B), the annexation of two adjacent diode clamp power switch series average-voltage unit is: sustained diode
(i+1) 2the negative electrode of (1≤i≤2n-1) and clamp diode D
i1the anode of (1≤i≤2n-1) is connected, power switch T
ithe emitter of (1≤i≤2n-1) and power switch T
(i+1)the collector electrode of (1≤i≤2n-1) is connected.Described diode clamp power switch series average-voltage unit group is for making the electric voltage equalization between two electric capacity comprising in unit group and making the electric voltage equalization between power switch, the power switch both end voltage simultaneously for comprising in limiting unit group.
Input side dc-link capacitance C
inpositive pole and A road topological structure in power switch T
a1collector electrode be connected, input side dc-link capacitance C
innegative pole and A road topological structure in power switch T
a2nemitter be connected; Capacitance C
0one end and A road topological structure in power switch T
anemitter be connected, capacitance C
0other end one end elementary with high frequency transformer Tr be connected; Power switch T in the other end that described high frequency transformer Tr is elementary and B road topological structure
bnemitter be connected; The ac input end of the secondary and described single-phase rectification bridge REC of high frequency transformer Tr is in parallel; The positive pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outpositive pole be connected, the negative pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outnegative pole be connected.
Described A road auxiliary circuit and A road topological structure composition A road and bridge arm, described A road auxiliary circuit and A road topological structure are combined the power switch both end voltage that can realize restriction A road topological structure and comprise.Described B road auxiliary circuit and B road topological structure composition B road and bridge arm, described B road auxiliary circuit and B road topological structure are combined the power switch both end voltage that can realize restriction B road topological structure and comprise.Described A road auxiliary circuit comprises power switch Ts
1and Ts
2, afterflow inductance L s, capacitance Cs, high frequency transformer Trs (elementary with secondary no-load voltage ratio is 1:2n), single-phase rectification bridge RECs.Power switch Ts
1the positive pole of current collection very auxiliary circuit input, power switch Ts
2the negative pole of transmitting very auxiliary circuit input; Power switch Ts
1emitter and power switch Ts
2collector electrode be connected; Capacitance Cs one end and power switch Ts
2emitter be connected, the capacitance Cs other end is connected with high frequency transformer Trs primary side one end; The high frequency transformer Trs primary side other end is connected with one end of afterflow inductance L s; The other end of afterflow inductance L s and power switch Ts
2collector electrode be connected; High frequency transformer Trs primary side is in parallel with the ac input end of single-phase rectification bridge RECs; The positive pole of the just very auxiliary circuit output of the DC output end of single-phase rectification bridge RECs, the negative pole of the DC output end of single-phase rectification bridge RECs is the negative pole of auxiliary circuit output.Described B road auxiliary circuit is identical with the circuit structure of A road auxiliary circuit.
Described power switch is preferably insulated gate bipolar transistor (IGBT) or mos field effect transistor (MOSFET).
The quantity of the diode clamp power switch series average-voltage unit of described needs is determined according to the electric pressure of applying working condition and power grade.
For realizing the two-way transformation of commutator transformer direct voltage, the present invention also discloses a kind of bidirectional diode clamper power switch series high voltage DC transformer, comprise two brachium pontis groups, be respectively I side brachium pontis group and O side brachium pontis group, described single brachium pontis group removes high frequency transformer Tr, single-phase rectification bridge REC, capacitance C by above-mentioned unilateral diode clamper power switch series high voltage DC transformer
0, input side bus capacitor C
inwith outlet side bus capacitor C
outand increase high frequency transformer TR, input side bus capacitor C
iinwith outlet side bus capacitor C
ooutcomposition.I side brachium pontis group is connected by high frequency transformer TR with O side brachium pontis group, capacitance C
i0one end and I side brachium pontis group in the power switch T of A road topological structure
iAnemitter be connected, capacitance C
i0other end one end elementary with high frequency transformer TR be connected; The power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and I side brachium pontis group
iBnemitter be connected; Input side bus capacitor C
iinpositive pole and I side brachium pontis group in the power switch T of A road topological structure
iA1collector electrode be connected, input side bus capacitor C
iinnegative pole and I side brachium pontis group in the power switch T of A road topological structure
iA (2n)emitter be connected.Capacitance C
o0one end and O side brachium pontis group in the power switch T of A road topological structure
oAnemitter be connected, capacitance C
o0other end one end elementary with high frequency transformer TR be connected; The middle power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and O side brachium pontis group
oBnemitter be connected; Outlet side bus capacitor C
oinpositive pole and O side brachium pontis group in the power switch T of A road topological structure
oA1collector electrode be connected, outlet side bus capacitor C
oinnegative pole and O side brachium pontis group in the power switch T of A road topological structure
oA (2n)emitter be connected.
Described power switch is preferably insulated gate bipolar transistor (IGBT) or mos field effect transistor (MOSFET).
Beneficial effect:
1, the subject matter that series power switch commutator transformer faces is the electric voltage equalization between the collector and emitter of each power switch.Existing several Series power commutator transformer is the electric voltage equalization by controlling to realize power switch to gate drive signal, therefore needs the drive singal of extra control circuit to grid to control.This not only adds component number, improve the cost of system and complexity, and its control strategy will be comparatively complicated, higher to the requirement of controller chip, antijamming capability declines.Diode clamp power switch series high voltage DC transformer disclosed by the invention, by the outside clamp diode that arranges at power switch and electric capacity, can realize good voltage clamping effect to power switch nearby.The capacitance voltage of clamp circuit can provide the balanced loop of capacitance voltage from balanced by afterflow inductance and diode.The both end voltage that described diode clamp power switch series high voltage DC transformer can realize series power switch is balanced, and power-limiting switch ends voltage, meet the diode clamp power switch series high voltage DC transformer of high-power application.
2, a kind of diode clamp power switch series high voltage DC transformer disclosed by the invention, steady-state pressure and the dynamic voltage balancing of power switch only just can be completed by topological structure, and do not need extra control circuit, greatly simplifie circuit structure, reduce hardware cost.Control strategy is comparatively simple simultaneously, so the good stability of system, antijamming capability are strong, lower to the requirement of controller chip.
3, sections in series power switch commutator transformer, realize power switch by the speed that turns on and off of reduction power switch all to press, this increases not only the switching loss of power switch, and reduce the efficiency of commutator transformer, have impact on heat dispersion and the life-span of power switch simultaneously.Diode clamp power switch series high voltage DC transformer disclosed by the invention, power switch is carried out from all pressing owing to using topology, therefore to the switch of power switch and turn-off speed unrestricted, be conducive to the quick shutoff realizing power switch, reduce switching loss.
4, the main purpose of series power switch commutator transformer is the voltage and the power that increase commutator transformer, therefore requires that the power switch quantity of connecting is as far as possible many, preferably realizes modularization.Diode clamp power switch series high voltage DC transformer disclosed by the invention, the power switch quantity that every road topological structure is connected can increase according to practical application or reduce, modularity is strong, be easy to realize voltage levels by series connection, therefore can flexible Application in the occasion of different electric pressure and power.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of unilateral diode clamper power switch series high voltage DC transformer of the present invention.
Fig. 2 is the circuit diagram of bidirectional diode clamper power switch series high voltage DC transformer of the present invention.
Fig. 3 is the circuit diagram of the preferred version of unilateral diode clamper power switch series high voltage DC transformer of the present invention.
Fig. 4 is the circuit diagram of the preferred version of bidirectional diode clamper power switch series high voltage DC transformer of the present invention.
Have in figure: capacitance C
0, high frequency transformer Tr, single-phase rectification bridge REC, input side bus capacitor C
in, outlet side bus capacitor C
out, power switch T
ai(1≤i≤2n), power switch T
bi(1≤i≤2n); Clamp capacitor C
ai(1≤i≤2n), clamp capacitor C
bi(1≤i≤2n); Clamp diode D
ai1(1≤i≤2n), clamp diode D
bi1(1≤i≤2n); Sustained diode
ai2(2≤i≤2n), sustained diode
bi2(2≤i≤2n); Auxiliary circuit power switch Ts
a1, Ts
a2, Ts
b1, Ts
b2; Auxiliary circuit high frequency transformer Trs
a, Trs
b; Auxiliary circuit capacitance Cs
a, Cs
b; Auxiliary circuit inductance L s
a, Ls
b; Auxiliary circuit single-phase rectification bridge REC
a, REC
b.Capacitance C
i0, high frequency transformer TR, input side bus capacitor C
iin, power switch T
iAi(1≤i≤2n), power switch T
iBi(1≤i≤2n); Clamp capacitor C
iAi(1≤i≤2n), clamp capacitor C
iBi(1≤i≤2n); Clamp diode D
iAi1(1≤i≤2n), clamp diode D
iBi1(1≤i≤2n); Sustained diode
iAi2(2≤i≤2n), sustained diode
iBi2(2≤i≤2n); Auxiliary circuit power switch Ts
iA1, Ts
iA2, Ts
iB1, Ts
iB2; Auxiliary circuit high frequency transformer Trs
iA, Trs
iB; Auxiliary circuit capacitance Cs
iA, Cs
iB; Auxiliary circuit inductance L s
iA, Ls
iB; Auxiliary circuit single-phase rectification bridge REC
iA, REC
iB.Capacitance C
o0, outlet side bus capacitor C
oout, power switch T
oAi(1≤i≤2n), power switch T
oBi(1≤i≤2n); Clamp capacitor C
oAi(1≤i≤2n), clamp capacitor C
oBi(1≤i≤2n); Clamp diode D
oAi1(1≤i≤2n), clamp diode D
oBi1(1≤i≤2n); Sustained diode
oAi2(2≤i≤2n), sustained diode
oBi2(2≤i≤2n); Auxiliary circuit power switch Ts
oA1, Ts
oA2, Ts
oB1, Ts
oB2; Auxiliary circuit high frequency transformer Trs
oA, Trs
oB; Auxiliary circuit capacitance Cs
oA, Cs
oB; Auxiliary circuit inductance L s
oA, Ls
oB; Auxiliary circuit single-phase rectification bridge REC
oA, REC
oB.Power switch T
ai(1≤i≤6), power switch T
bi(1≤i≤6); Clamp capacitor C
ai(1≤i≤6), clamp capacitor C
bi(1≤i≤6); Clamp diode D
ai1(1≤i≤6), clamp diode D
bi1(1≤i≤6); Sustained diode
ai2(2≤i≤6), sustained diode
bi2(2≤i≤6); Power switch T
iAi(1≤i≤6), power switch T
iBi(1≤i≤6); Clamp capacitor C
iAi(1≤i≤6), clamp capacitor C
iBi(1≤i≤6); Clamp diode D
iAi1(1≤i≤6), clamp diode D
iBi1(1≤i≤6); Sustained diode
iAi2(2≤i≤6), sustained diode
iBi2(2≤i≤6); Power switch T
oAi(1≤i≤6), power switch T
oBi(1≤i≤6); Clamp capacitor C
oAi(1≤i≤6), clamp capacitor C
oBi(1≤i≤6); Clamp diode D
oAi1(1≤i≤6), clamp diode D
oBi1(1≤i≤6); Sustained diode
oAi2(2≤i≤6), sustained diode
oBi2(2≤i≤6);
Embodiment
In order to better objects and advantages of the present invention are described, below in conjunction with accompanying drawing and example, summary of the invention is described further.
Embodiment 1: be described to use 12 diode clamp power switch series average-voltage unit.
As shown in Figure 3, disclosed in the present embodiment, a kind of unilateral diode clamper power switch series high voltage DC transformer, comprises input side dc-link capacitance C
in, capacitance C
0, high frequency transformer Tr, single-phase rectification bridge REC, outlet side dc-link capacitance C
outand auxiliary circuit, described auxiliary circuit is divided into A road auxiliary circuit and B road auxiliary circuit.Also comprise the single channel topological structure (A, B) of two-way parallel connection, be respectively A road topological structure and B road topological structure, described single channel topological structure (A, B) for topological structure is comprised electric capacity between electric voltage equalization and make between power switch electric voltage equalization, the single channel topological structure (A, B) is simultaneously combined the power switch both end voltage that can realize limiting topological structure and comprise with auxiliary circuit (A, B).Described single channel topological structure (A, B) is made up of even number diode clamp power switch series average-voltage units in series, and described single diode clamp power switch series average-voltage unit comprises power switch T
i(1≤i≤6), clamp diode D
i1(1≤i≤6), clamp capacitor C
i(1≤i≤6) and sustained diode
i2(2≤i≤6), power switch T
ithe collector electrode of (1≤i≤6) and clamp capacitor C
ithe one end of (1≤i≤6) is connected, clamp capacitor C
ithe other end of (1≤i≤6) and clamp diode D
i1the anode of (1≤i≤6) is connected, clamp diode D
i1the negative electrode of (1≤i≤6) and power switch T
ithe emitter of (1≤i≤6) is connected, sustained diode
i2the anode of (2≤i≤6) and clamp diode D
i1the anode of (2≤i≤2n) is connected.When forming single channel topological structure (A, B), first diode clamp power switch series average-voltage unit is only by power switch T
1, clamp diode D
11with clamp capacitor C
1.Two diode clamp power switch series average-voltage unit composition diode clamp power switch series average-voltage unit groups adjacent in single channel topological structure (A, B), the annexation of two adjacent diode clamp power switch series average-voltage unit is: sustained diode
(i+1) 2the negative electrode of (1≤i≤5) and clamp diode D
i1the anode of (1≤i≤5) is connected, power switch T
ithe emitter of (1≤i≤5) and power switch T
(i+1)the collector electrode of (1≤i≤5) is connected.Described diode clamp power switch series average-voltage unit group is for making the electric voltage equalization between two electric capacity comprising in unit group and making the electric voltage equalization between power switch, the power switch both end voltage simultaneously for comprising in limiting unit group.
Input side dc-link capacitance C
inpositive pole and A road topological structure in power switch T
a1collector electrode be connected, input side dc-link capacitance C
innegative pole and A road topological structure in power switch T
a6emitter be connected; Capacitance C
0one end and A road topological structure in power switch T
a6emitter be connected, capacitance C
0other end one end elementary with high frequency transformer Tr be connected; Power switch T in the other end that described high frequency transformer Tr is elementary and B road topological structure
b3emitter be connected; The ac input end of the secondary and described single-phase rectification bridge REC of high frequency transformer Tr is in parallel; The positive pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outpositive pole be connected, the negative pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outnegative pole be connected.
Described A road auxiliary circuit and A road topological structure composition A road and bridge arm, described A road auxiliary circuit and A road topological structure are combined the power switch both end voltage that can realize restriction A road topological structure and comprise.Described B road auxiliary circuit and B road topological structure composition B road and bridge arm, described B road auxiliary circuit and B road topological structure are combined the power switch both end voltage that can realize restriction B road topological structure and comprise.Described A road auxiliary circuit comprises power switch Ts
1and Ts
2, afterflow inductance L s, capacitance Cs, high frequency transformer Trs (elementary with secondary no-load voltage ratio is 1:2n), single-phase rectification bridge RECs.Power switch Ts
1the positive pole of current collection very auxiliary circuit input, power switch Ts
2the negative pole of transmitting very auxiliary circuit input; Power switch Ts
1emitter and power switch Ts
2collector electrode be connected; Capacitance Cs one end and power switch Ts
2emitter be connected, the capacitance Cs other end is connected with high frequency transformer Trs primary side one end; The high frequency transformer Trs primary side other end is connected with one end of afterflow inductance L s; The other end of afterflow inductance L s and power switch Ts
2collector electrode be connected; High frequency transformer Trs primary side is in parallel with the ac input end of single-phase rectification bridge RECs; The positive pole of the DC output end of single-phase rectification bridge RECs is connected with the positive pole of DC bus power supply U; The DC output end of described auxiliary circuit single-phase rectification bridge RECs is auxiliary circuit output.Described B road auxiliary circuit is identical with the circuit structure of A road auxiliary circuit.
As shown in Figure 3, a kind of unilateral diode clamper power switch series high voltage DC transformer disclosed in the present embodiment, the course of work is: adopt Single-phase SPWM modulation or single-phase SVPWM to modulate the drive singal producing each power switch, make unilateral diode clamper power switch series high voltage DC transformer be outlet side direct voltage by input side DC voltage conversion.Power switch T
a1, T
a2, T
a3, T
b4, T
b5and T
b6drive singal consistent, power switch T
a4, T
a5, T
a6, T
b1, T
b2, T
b3drive singal consistent.For A road and bridge arm, to power switch T
ai(1≤i≤6), due to clamp diode D
ai1effect, make the voltage U between its collector and emitter
cEAialways lower than clamp capacitor C
aivoltage U
cAi.Therefore, as long as control clamp capacitor C
aivoltage U
cAi, just can by power switch T
aicollector and emitter between voltage U
cEAibe limited in U
cAibelow, thus prevent power switch T
aiovervoltage.For power switch T
aiwith power switch T
a (i+1)(1≤i≤5), as power switch T
aiwhen opening, if now clamp capacitor C
aivoltage U
cAihigher than clamp capacitor C
a (i+1)voltage U
cA (i+1), then clamp capacitor C
aiwill by clamp capacitor C
ai, power switch T
ai, clamp capacitor C
a (i+1)and sustained diode
a (i+1)the loop formed is to clamp capacitor C
a (i+1)charging, due to sustained diode
a (i+1) 2effect, as clamp capacitor C
aivoltage U
cAiwith clamp capacitor C
a (i+1)voltage U
cA (i+1)time equal, charging process stops; If now clamp capacitor C
a (i+1)voltage U
cA (i+1)higher than clamp capacitor C
aivoltage U
cAi, then diode D
a (i+1) 2effect, make clamp capacitor C
a (i+1)can not to clamp capacitor C
aicharging.Owing to there is the factor such as parasitic parameter, conduction voltage drop in side circuit, therefore during circuit actual motion, clamp capacitor C
aithe voltage U of (1≤i≤6)
cAiincrease with i is raised, wherein clamp capacitor C
a6voltage U
cA6the highest.Now, auxiliary circuit will be started working, by electric capacity C
a6voltage stabilization at U/3, thus by clamp capacitor C
a1, C
a2, C
a3, C
a4, C
a5voltage all control at U/3, and thus by power switch T
a1, T
a2, T
a3, T
a4, T
a5, T
a6collector emitter voltage be limited in below U/3, thus prevent each power switch overvoltage.As power switch T
a1, T
a2, T
a3drive singal or power switch T
a4, T
a5, T
a6drive singal not exclusively synchronous time, postpone the power switch opening and turn off in advance due to be subject to the clamp capacitor in parallel with it and clamp diode effect and can not overvoltage.The course of work of B road and bridge arm is identical with said process.Therefore single-phase diode clamper power switch series high voltage DC transformer can drive singal should be synchronous the drive singal of power switch asynchronous time also can run by safety and steady.
Embodiment 2:
As shown in Figure 4, for realizing the two-way transformation of commutator transformer direct voltage, the present embodiment also discloses a kind of bidirectional diode clamper power switch series high voltage DC transformer, comprise two brachium pontis groups, be respectively I side brachium pontis group and O side brachium pontis group, described single brachium pontis group removes high frequency transformer Tr, single-phase rectification bridge REC, capacitance C by above-mentioned unilateral diode clamper power switch series high voltage DC transformer
0, input side bus capacitor C
inwith outlet side bus capacitor C
outand increase high frequency transformer TR, input side bus capacitor C
iinwith outlet side bus capacitor C
ooutcomposition.I side brachium pontis group is connected by high frequency transformer TR with O side brachium pontis group, capacitance C
i0one end and I side brachium pontis group in the power switch T of A road topological structure
iA3emitter be connected, capacitance C
i0other end one end elementary with high frequency transformer TR be connected; The power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and I side brachium pontis group
iBnemitter be connected; Input side bus capacitor C
iinpositive pole and I side brachium pontis group in the power switch T of A road topological structure
iA1collector electrode be connected, input side bus capacitor C
iinnegative pole and I side brachium pontis group in the power switch T of A road topological structure
iA6emitter be connected.Capacitance C
o0one end and O side brachium pontis group in the power switch T of A road topological structure
oA3emitter be connected, capacitance C
o0other end one end elementary with high frequency transformer TR be connected; The middle power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and O side brachium pontis group
oB3emitter be connected; Outlet side bus capacitor C
oinpositive pole and O side brachium pontis group in the power switch T of A road topological structure
oA1collector electrode be connected, outlet side bus capacitor C
oinnegative pole and O side brachium pontis group in the power switch T of A road topological structure
oA6emitter be connected.
The operation principle of a kind of bidirectional diode clamper power switch series high voltage DC transformer disclosed in the present embodiment and working method and unilateral diode clamper power switch series high voltage DC transformer ' s type are seemingly.The main distinction is that bidirectional diode clamper power switch series high voltage DC transformer can not only realize input side DC voltage conversion being outlet side direct voltage, and can also realize outlet side DC voltage conversion is input side direct voltage.
Above-described specific descriptions; the object of inventing, technical scheme and beneficial effect are further elaborated; be understood that; the foregoing is only specific embodiments of the invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a unilateral diode clamper power switch series high voltage DC transformer, comprises input side dc-link capacitance C
in, capacitance C
0, high frequency transformer Tr, single-phase rectification bridge REC, outlet side dc-link capacitance C
outand auxiliary circuit, described auxiliary circuit is divided into A road auxiliary circuit and B road auxiliary circuit; It is characterized in that: the single channel topological structure (A, B) also comprising two-way parallel connection, be respectively A road topological structure and B road topological structure, described single channel topological structure (A, B) for topological structure is comprised electric capacity between electric voltage equalization and make between power switch electric voltage equalization, the topological structure (A, B) is simultaneously combined the power switch both end voltage that can realize limiting topological structure and comprise respectively with auxiliary circuit (A, B); Described single channel topological structure (A, B) is made up of even number diode clamp power switch series average-voltage units in series, and described single diode clamp power switch series average-voltage unit comprises power switch T
i(1≤i≤2n), clamp diode D
i1(1≤i≤2n), clamp capacitor C
i(1≤i≤2n) and sustained diode
i2(2≤i≤2n), power switch T
ithe collector electrode of (1≤i≤2n) and clamp capacitor C
ithe one end of (1≤i≤2n) is connected, clamp capacitor C
ithe other end of (1≤i≤2n) and clamp diode D
i1the anode of (1≤i≤2n) is connected, clamp diode D
i1the negative electrode of (1≤i≤2n) and power switch T
ithe emitter of (1≤i≤2n) is connected, sustained diode
i2the anode of (2≤i≤2n) and clamp diode D
i1the anode of (1≤i≤2n) is connected; When forming single channel topological structure (A, B), first diode clamp power switch series average-voltage unit is only by power switch T
1, clamp diode D
11with clamp capacitor C
1composition; Two diode clamp power switch series average-voltage unit composition diode clamp power switch series average-voltage unit groups adjacent in single channel topological structure (A, B), the annexation of two adjacent diode clamp power switch series average-voltage unit is, sustained diode
(i+1) 2the negative electrode of (1≤i≤2n-1) and clamp diode D
i1the anode of (1≤i≤2n-1) is connected, power switch T
ithe emitter of (1≤i≤2n-1) and power switch T
(i+1)the collector electrode of (1≤i≤2n-1) is connected; Described diode clamp power switch series average-voltage unit group is for making the electric voltage equalization between two electric capacity comprising in unit group and making the electric voltage equalization between power switch, the power switch both end voltage simultaneously for comprising in limiting unit group.
2. a kind of unilateral diode clamper power switch series high voltage DC transformer according to claim 1, is characterized in that: input side dc-link capacitance C
inpositive pole and A road topological structure in power switch T
a1collector electrode be connected, input side dc-link capacitance C
innegative pole and A road topological structure in power switch T
a2nemitter be connected; Capacitance C
0one end and A road topological structure in power switch T
anemitter be connected, capacitance C
0other end one end elementary with high frequency transformer Tr be connected; Power switch T in the other end that described high frequency transformer Tr is elementary and B road topological structure
bnemitter be connected; The ac input end of the secondary and described single-phase rectification bridge REC of high frequency transformer Tr is in parallel; The positive pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outpositive pole be connected, the negative pole of the DC output end of single-phase rectification bridge REC and outlet side bus capacitor C
outnegative pole be connected.
3. a kind of unilateral diode clamper power switch series high voltage DC transformer according to claim 1 and 2, it is characterized in that: described A road auxiliary circuit and A road topological structure composition A road and bridge arm, described A road auxiliary circuit and A road topological structure are combined the power switch both end voltage that can realize restriction A road topological structure and comprise; Described B road auxiliary circuit and B road topological structure composition B road and bridge arm, described B road auxiliary circuit and B road topological structure are combined the power switch both end voltage that can realize restriction B road topological structure and comprise; Described A road auxiliary circuit comprises power switch Ts
1and Ts
2, afterflow inductance L s, capacitance Cs, high frequency transformer Trs, single-phase rectification bridge RECs; Power switch Ts
1the positive pole of current collection very auxiliary circuit input, power switch Ts
2the negative pole of transmitting very auxiliary circuit input; Power switch Ts
1emitter and power switch Ts
2collector electrode be connected; Capacitance Cs one end and power switch Ts
2emitter be connected, the capacitance Cs other end is connected with high frequency transformer Trs primary side one end; The high frequency transformer Trs primary side other end is connected with one end of afterflow inductance L s; The other end of afterflow inductance L s and power switch Ts
2collector electrode be connected; High frequency transformer Trs primary side is in parallel with the ac input end of single-phase rectification bridge RECs; The positive pole of the just very auxiliary circuit output of the DC output end of single-phase rectification bridge RECs, the negative pole of the DC output end of single-phase rectification bridge RECs is the negative pole of auxiliary circuit output; Described B road auxiliary circuit is identical with the circuit structure of A road auxiliary circuit.
4. a kind of unilateral diode clamper power switch series high voltage DC transformer according to claim 1 and 2, is characterized in that: described power switch is preferably insulated gate bipolar transistor (IGBT) or mos field effect transistor (MOSFET).
5. a kind of unilateral diode clamper power switch series high voltage DC transformer according to claim 1 and 2, is characterized in that: the quantity of the diode clamp power switch series average-voltage unit of described needs is determined according to the electric pressure of applying working condition and power grade.
6. a bidirectional diode clamper power switch series high voltage DC transformer, it is characterized in that: comprise two brachium pontis groups, be respectively I side brachium pontis group and O side brachium pontis group, described single brachium pontis group removes high frequency transformer Tr, single-phase rectification bridge REC, capacitance C by a kind of unilateral diode clamper power switch series high voltage DC transformer according to claim 1
0, input side bus capacitor C
inwith outlet side bus capacitor C
outand increase high frequency transformer TR, input side bus capacitor C
iinwith outlet side bus capacitor C
ooutcomposition; I side brachium pontis group is connected by high frequency transformer TR with O side brachium pontis group, capacitance C
i0one end and I side brachium pontis group in the power switch T of A road topological structure
iAnemitter be connected, capacitance C
i0other end one end elementary with high frequency transformer TR be connected; The power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and I side brachium pontis group
iBnemitter be connected; Input side bus capacitor C
iinpositive pole and I side brachium pontis group in the power switch T of A road topological structure
iA1collector electrode be connected, input side bus capacitor C
iinnegative pole and I side brachium pontis group in the power switch T of A road topological structure
iA (2n)emitter be connected; Capacitance C
o0one end and O side brachium pontis group in the power switch T of A road topological structure
oAnemitter be connected, capacitance C
o0other end one end elementary with high frequency transformer TR be connected; The middle power switch T of B road topological structure in the other end that described high frequency transformer TR is elementary and O side brachium pontis group
oBnemitter be connected; Outlet side bus capacitor C
oinpositive pole and O side brachium pontis group in the power switch T of A road topological structure
oA1collector electrode be connected, outlet side bus capacitor C
oinnegative pole and O side brachium pontis group in the power switch T of A road topological structure
oA (2n)emitter be connected.
7. a kind of bidirectional diode clamper power switch series high voltage DC transformer according to claim 6, is characterized in that: described power switch is preferably insulated gate bipolar transistor (IGBT) or mos field effect transistor (MOSFET).
8. a kind of bidirectional diode clamper power switch series high voltage DC transformer according to claim 6 or 7, is characterized in that: the quantity of the diode clamp power switch series average-voltage unit of described needs is determined according to the electric pressure of applying working condition and power grade.
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| CN105406722B (en) | 2018-10-02 |
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