CN1741358A - DC-to-DC converter with high-frequency buckling transformer - Google Patents

Abstract

A multiphase DC to DC boost converter with high frequency folded transformer consists of a folded device with N numbers of iron cores as N being phase number which is greater or equal to 2 , multiple diodes with each diode P type side being coupled to each stand bar of iron core on folded device , and multiple transistors with each transistor drain electrode being coupled to each stand bar of iron core on folded device . -

Description

Direct current with high-frequency buckling transformer is to direct current transducer

Technical field

To direct current transducer, particularly a kind of have the direct current of high-frequency buckling transformer to direct current transducer about a kind of direct current in the present invention.

Background technology

Direct current to direct current transducer generally use with battery as electronic equipment, regeneration energy resource system and the Voltage Regulator Module in power supply source (voltage regulator module, VRM) in, will regulate voltage or the electric current that power supply is produced.Most transducer all needs higher switching frequency, improving transient response, and reduces the volume of passive component.Yet, do not see the transducer that switching frequency surpasses 1MHz so far yet.

Therefore, the transducer with multiple operation of staggered diverter switch control is fit to operate in the condition of low voltage and high current.The efficient that it is preferable makes that the switch type converter of paralleling and interleaving operation is more and more welcome.The I of (PCC) power ²The conducting power loss of R is less.This kind transducer can be eliminated ripple current and transient response preferably.Yet it need divide equally identical electric current jointly parallel module.Therefore, tolerance of assembly (tolerance) and parameter just also all may cause the imbalance of electric current.

Fig. 1 with Figure 2 shows that three-phase voltage increasing and step-down conversion.In Fig. 1, boost converter offers load 20 after power supply 10 is boosted, and includes first inductance L 1 that is connected to the first diode D1, the 3rd inductance L 3 that is connected to second inductance L 2 of the second diode D2 and is connected to the 3rd diode D3.And the other end of first, second and third diode D1, D2, D3 is couple to an end of load 20.In addition, also include the first transistor T1, transistor seconds T2 and the 3rd transistor T 3.The drain electrode of the first transistor T1 is connected between first inductance L 1 and the first diode D1, and the source electrode of the first transistor T1 then is connected to the other end of load 20.The connection of transistor seconds T2 and the 3rd transistor T 3 and the first transistor T1 are similar.In addition, capacitor C is connected with load 20 in parallel.

In Fig. 2, step-down controller offers load 20 after with power supply 10 step-downs.Include the first transistor T1 that is connected to first inductance L 1, the 3rd transistor T 3 that is connected to the transistor seconds T2 of second inductance L 2 and is connected to the 3rd inductance L 3.The other end of first, second, third inductance L 1, L2, L3 and an end that is couple to load 20.In addition, also include the 4th, the 5th, the 6th transistor T 4, T5, T6.The drain electrode of the 4th transistor T 4 is connected between the first transistor T1 and first inductance L 1.The connection of the 5th transistor T 5 and the 6th transistor T 6 and the 4th transistor T 4 are similar.In addition, capacitor C is connected with load 20 in parallel.

Yet there are some technical problems that need to be resolved hurrily in the transformer that prior art disclosed.For example, need three electric currents of sensing, so have quite high ripple current in its electric current also as shunting.In addition, also need a lot of iron cores.

Summary of the invention

The object of the present invention is to provide simple, the high efficiency transducer of a kind of circuit.

Main purpose of the present invention is to provide a kind of direct current with high-frequency buckling transformer to direct current transducer, to solve the existing problem of prior art substantially.Disclosed direct current can be eliminated ripple current, simplifies Current Control and have better transient response direct current transducer.The ripple current of all changeover modules and passive component all can be via adjusting the purpose that near the operating point of boundary condition (boundary condition) reaches elimination, and therefore the conduction loss at these operating points can minimize.In the present invention, the phase current of Transformer Winding all equates because all are flowed through, and therefore no longer needs electric current on average to control, and has transient response faster.Phase shift pulse-width modulation switching signal can provide the voltage of balance on the winding of transformer.

According to purpose of the present invention, disclosed multiphase DC comprises a bending type device to DC boost converter, has N and props up iron core, and wherein N is the number of phases more than or equal to 2; A plurality of diodes, the P type side of each diode is coupled to each leg of the iron core of bending type device; And a plurality of transistors, each transistor drain is coupled to each leg of the iron core of bending type device.

The design according to the present invention, this bending type device is one not have the autotransformer (autotransformer) of isolation.

The design according to the present invention, this N of this bending type device props up iron core and does not have air gap, to form a buckling transformer (zigzag transformer).

The design according to the present invention, this N of this bending type device props up iron core and has air gap, to form a bending type manifold type inductance (zigzag coupled inductor).

The design according to the present invention, each leg of this iron core of this bending type device has two coils.

The design according to the present invention, this multiphase DC also includes an input inductance to DC boost converter, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

The design according to the present invention, this ripple current is eliminated under boundary condition.

The design according to the present invention, the work period of this boundary condition, (duty cycle) was h/N, h=1 wherein, 2,3 ..., N-1.

The design according to the present invention, this transistorized grid is in order to receive suitable phase shift (phase-shifted) signal.

According to purpose of the present invention, disclosed multiphase DC comprises a bending type device to DC decompression converter, has N and props up iron core, and wherein N is the number of phases more than or equal to 2; And many to transistor, each connects with series system transistor, and each leg of iron core is connected between every pair of transistor.

The design according to the present invention, this bending type device is one not have the autotransformer (autotransformer) of isolation.

The design according to the present invention, this N of this bending type device props up iron core and does not have air gap, to form a buckling transformer (zigzag transformer).

The design according to the present invention, this N of this bending type device props up iron core and has air gap, to form a bending type manifold type inductance (zigzag coupled inductor).

The design according to the present invention, each leg of this iron core of this bending type device has two coils.

The design according to the present invention, this multiphase DC also includes an output inductance to DC boost converter, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

The design according to the present invention, this ripple current is eliminated under boundary condition.

The design according to the present invention, the work period of this boundary condition, (duty cycle) was h/N, h=1 wherein, 2,3 ..., N-1.

The design according to the present invention, this transistorized grid is in order to receive suitable phase shift (phase-shifted) signal.

Provide a kind of isolated DC to direct current transducer according to a further aspect in the invention,, had the iron core of one or three legs comprising a buckling transformer; One three-phase transformer has a primary coil and a level coil, and wherein this secondary coil is connected to this buckling transformer; Three pairs of transistors, each connects with series system transistor, and each phase winding of the primary coil of this three-phase transformer is connected between this every pair transistor; And one first, second, third transistor, each transistor drain is coupled to each leg of this iron core of this bending type device.

The design according to the present invention, each leg of this iron core of this buckling transformer has two coils.

The design according to the present invention, this isolated DC also includes an input inductance to direct current transducer, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

The design according to the present invention, this ripple current is eliminated under boundary condition.

The design according to the present invention, the work period of this boundary condition, (duty cycle) was 1/3 or 2/3.

The design according to the present invention, this first, second, third transistorized grid is in order to receive suitable phase shift (phase-shifted) signal.

A kind of twice current rectifier is provided according to a further aspect in the invention, and comprising having: a buckling transformer has two-phase; And a transformer, have a primary coil and a level coil, wherein this secondary coil is connected to this buckling transformer.

The design according to the present invention, this twice current rectifier also includes an output inductance, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

The design according to the present invention, this twice current rectifier also includes two transistor, is connected to the coil of this two-phase of this buckling transformer respectively.

According to principle of the present invention, disclosed direct current has the advantage that does not need electric current on average to control to direct current transducer.

According to principle of the present invention, disclosed direct current has the advantage of the ripple current that can eliminate passive component and changeover module to direct current transducer.

According to principle of the present invention, disclosed direct current has the advantage of low conduction loss to direct current transducer.

According to principle of the present invention, under lower switching frequency, disclosed direct current has the advantage of transient response faster to direct current transducer.

Below in execution mode, be described in detail detailed features of the present invention and advantage, its content is enough to make any related art techniques person of haveing the knack of to understand technology contents of the present invention and implements according to this, and according to content, the claim and graphic that this specification disclosed, any related art techniques person of haveing the knack of can understand purpose and the advantage that the present invention is correlated with easily.

Description of drawings

Fig. 1 is the circuit diagram of the boost converter that prior art disclosed;

Fig. 2 is the circuit diagram of the step-down controller that prior art disclosed;

Fig. 3 is the circuit diagram of disclosed boost converter;

Fig. 4 is the circuit diagram of disclosed step-down controller;

Fig. 5 A is the voltage vector diagram of buckling transformer used in the present invention;

Fig. 5 B is the winding of buckling transformer used in the present invention;

Fig. 6 A～Fig. 6 D is the operation waveform diagram of disclosed three-phase voltage increasing transducer;

Fig. 7 is the operation waveform diagram of disclosed three-phase step-down transducer;

Fig. 8 A～Fig. 8 B is the regular ripple current that the inductance of disclosed transducer is exported;

Fig. 9 has the isolated DC of bending deformation depressor to direct current transducer for disclosed;

Figure 10 A is the disclosed current multiplication rectifier with two-phase buckling transformer;

Figure 10 B is the winding of the disclosed current multiplication rectifier with two-phase buckling transformer;

Figure 11 is the iron core of the disclosed direct current with heterogeneous buckling transformer to direct current transducer;

Figure 12 A～Figure 12 B is the voltage phasor-diagram of disclosed four and five commutating phase devices;

Figure 13 is the operation waveform diagram of disclosed four commutating phase devices;

Figure 14 A is the current waveform of experimental result, wherein Vs=36 volt and Vo=48 volt;

Figure 14 B is the Transformer Winding voltage of experimental result, wherein Vs=36 volt and Vo=48 volt; And

Experimental result when Figure 15 is D=33.3%, wherein Vs=32 volt and Vo=48 volt.

Wherein, description of reference numerals is as follows:

The 10-power supply; The 20-load; The 30-buckling transformer; The 40-three-phase transformer;

The 51-transistor; The 52-transistor; The 53-transistor; The 54-transistor;

The 55-transistor; The 56-transistor; The 57-transistor; The 58-transistor;

60-two-phase buckling transformer; The 70-transformer; D1-first diode;

D2-second diode; D3-the 3rd diode; L1-first inductance;

L2-second inductance; L3-the 3rd inductance; The T1-the first transistor;

The T2-transistor seconds; T3-the 3rd transistor; T4-the 4th transistor;

T5-the 5th transistor; T6-the 6th transistor; C-electric capacity;

LS-input inductance; LO-output inductance.

Embodiment

For making purpose of the present invention, structure, feature and function thereof there are further understanding, now cooperate embodiment to be described in detail as follows.Above about content of the present invention explanation and the explanation of following execution mode in order to demonstration with explain principle of the present invention, and provide the protection range of patent of the present invention further to explain.

Please refer to Fig. 3, be the circuit diagram of disclosed boost converter.As shown in the figure, boost converter sends load 20 to after power supply 10 is boosted, and includes a buckling transformer 30, input inductance L S, the first diode D1, the second diode D2, the 3rd diode D3, the first transistor T1, transistor seconds T2, the 3rd transistor T 3.In addition, also including a capacitor C and load 20 connects in parallel by chance.

Buckling transformer 30 is a kind of autotransformer (autotransformer) that does not have isolation, for instance, can be the buckling transformer with three-phase.The core material of buckling transformer 30 is not for having the soft Ferrite (ferrite) of any air gap (airgap).The end of input inductance L S is connected to the central point of buckling transformer 30.With the three-phase installation of Fig. 3, the P type side of the first diode D1, the second diode D2 and the 3rd diode D3 is connected to each phase of buckling transformer 30 respectively by chance.And the drain electrode of the first transistor T1, transistor seconds T2 and the 3rd transistor T 3 also is connected to each phase of buckling transformer 30, source electrode then is connected to the negative input end (earth terminal) of power supply 10, and grid then has the pulse-width modulation signal of suitable phase shift in order to reception.The first transistor T1, transistor seconds T2 and the 3rd transistor T 3 are preferably insulated gate transistor (IGBT).

Please refer to Fig. 4, be the circuit diagram of disclosed step-down controller.Step-down controller offers load 20 after with power supply 10 step-downs, includes buckling transformer 30, output inductance L O, the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6.In addition, also including a capacitor C and load 20 connects in parallel by chance.

Similarly, buckling transformer 30 is a kind of autotransformer (autotransformer) that does not have isolation, for instance, can be the buckling transformer with three-phase.The core material of buckling transformer 30 is not for having the soft Ferrite (ferrite) of any air gap (airgap).The end of output inductance L O is connected to the central point of buckling transformer 30.With the three-phase installation of Fig. 3, the drain electrode of the first transistor T1, transistor seconds T2 and the 3rd transistor T 3 is connected to each phase of buckling transformer 30 respectively, and source electrode then is connected to the negative input end (earth terminal) of power supply 10.The drain electrode of the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6 is connected to power supply 10, and its source electrode is connected to each phase of buckling transformer 30 respectively.The grid of the first transistor T1, transistor seconds T2 and the 3rd transistor T 3 then has the pulse-width modulation signal of suitable phase shift in order to reception.The first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4, the 5th transistor T 5 and the 6th transistor T 6 are preferably insulated gate transistor (IGBT).

Buckling transformer 30 is a kind of autotransformer (autotransformer) that does not have isolation.Its voltage vector and tri-phase iron core winding are shown in Fig. 5 A and Fig. 5 B.Each leg of the tri-phase iron core of buckling transformer 30 all has two windings, and the connected mode of each winding is according to the voltage vector decision of Fig. 5 A.Iron core in the buckling transformer 30 among Fig. 3 and Fig. 4 does not have air gap, and it also can adopt bending type coupling inductance (zigzag coupled inductor), its similar, but its iron core and have air gap.In the present invention, buckling transformer 30 is defined as the bending type device with the bending type coupling inductance.

According to Fig. 3 and Fig. 4, wherein transducer has three inputs that can receive the pulse-width modulation signal, and each pulse-width modulation signal is phase shift 120 degree suitably all, with the three-phase voltage (V of balancing transformer winding _Za+ V _Zb+ V _Zc=0).These three inputs are the grid of the first transistor T1, transistor seconds T2 and the 3rd transistor T 3.Because when the leakage inductance of buckling transformer 30 may not enough maybe can't obtain higher leakage inductance, can in circuit, add an input inductance L S or an output inductance L O, to eliminate ripple current.

Based on the winding voltage of these balances, meet following equation for the winding current that flows into three-phase transformer: $i_{\mathrm{za}}=i_{\mathrm{zb}}=i_{\mathrm{zc}}={-i}_{\mathrm{za}}^{*}={-i}_{\mathrm{zb}}^{*}={-i}_{\mathrm{zc}}^{*},$ I wherein _Zj(j=a, b c) are each phase winding electric current of transformer, and ^*The expression secondary side winding.The electric current of power supply 10 comprises flip-flop, is three times switching frequency, that is three times of winding current, i _s=3i _Za

The winding voltage v of negligible resistance and leakage inductance _ZaCan by: $v_{\mathrm{za}}=L_{\mathrm{za}}\frac{{\mathrm{di}}_{\mathrm{za}}}{\mathrm{dt}}+L_{\mathrm{zb}}\frac{{\mathrm{di}}_{\mathrm{za}}}{\mathrm{dt}}-M_{\mathrm{ab}}\frac{{\mathrm{di}}_{\mathrm{zc}}}{\mathrm{dt}}-M_{\mathrm{ab}}\frac{{\mathrm{di}}_{\mathrm{zb}}}{\mathrm{dt}}$ Expression, wherein L _ZaAnd L _ZbBe the self-induction of a phase winding and b phase winding, and M _AbMutual inductance for a phase winding and b phase winding.Impedance Z for all identical currents _ANBe Z _AN=2 ω (L _Za-M) 0, wherein L _Za=L _Zb M, ω=2 π f and f are switching frequency.

Because leakage inductance is considerably little, therefore, when electric current was flowed through all winding of transformer, transformer can provide enough little impedance substantially.Consideration is Z in the impedance of the balanced three-phase current of a certain switching frequency _AN=3 ω L _Za

Because high impedance, the electric current that therefore flows into buckling transformer can be ignored.And since on the iron core summation of magnetic flux of three legs do not equal zero, make that magnetic flux can be by the path of a little impedance.And because the electric current that enters transformer has phase place, so on the iron core three legs do not have magnetomotive force (MagnetomotiveForce, MMF).Therefore, except leakage flux, just there is not the magnetic flux of extraneoas loss.

About disclosed voltage boosting dc to direct current transducer and decompression DC to the explanation that will be right in following paragraph of the detailed operation process of direct current transducer.At first explanation has the operation of high-frequency buckling transformer.

According to the phase shift switching signal overlapping cycle each other, voltage boosting dc can be divided into three kinds of different operator schemes to direct current transducer: (1) D＜33.3%; (2) 33.3%＜D＜66.7%; And (3) 66.7%＜D＜100%.Similar with traditional transducer, voltage boosting dc of the present invention can be represented by the transfer ratio M of output voltage to input voltage the transfer function (transfer function) of direct current transducer: $M=\frac{V_o}{V_s}=\frac{1}{1-D},$ Wherein D boosts the turn-on cycle of diverter switch than (duty ratio), V _sBe the DC input voitage of power supply 10, and V _oBe output voltage.Turn-on cycle is than the open and close time ratio for the diverter switch of boosting.If magnetoelectricity sense (magnetizing inductance) is enough high, then all winding currents of transformer will equate.The operation waveform diagram of three kinds of different modes is shown in Fig. 6 A～Fig. 6 C.

Ripple current appears at switching frequency frequency tripling part, and three-phase equilibrium voltage can be obtained by three signals, is described as follows.

(1)D＜33.3％：

In this pattern, do not overlap between the signal.The electric current that flows into input inductance L S both sides can be by following and get.The voltage at inductance two ends is V _{LS, neg}=V _s-V _o, V wherein _{LS, neg}For as the defined negative voltage of Fig. 5 A, and V _{LS, pos}Be forward voltage.The represented inductive drop of regional A in graphic and area B must be identical, therefore

$V_{\mathrm{Ls},\mathrm{pos}}=\frac{1-3D}{3D}{V}_{\mathrm{Ls},\mathrm{neg}}=\frac{1-3D}{3(1-D)}{V}_s.$

Therefore, the equation of ripple current is: ${\mathrm{\ΔI}}_s=\frac{V_{\mathrm{Ls},\mathrm{pos}}}{L_s}{\mathrm{DT}}_s=\frac{D(1-3D)}{3(1-D)}\frac{T_s{V}_s}{L_s}.$

(2)33.3＜D＜66.7％：

Shown in Fig. 6 B, in a turn-on cycle, have only the part that overlapping is arranged between two signals to occur.The forward voltage of inductance and negative voltage can be expressed as respectively:

V _{LS, neg}-V _{LS, pos}=V _o-2V _sAnd $V_{\mathrm{LS},\mathrm{pos}}=\frac{2-3D}{3D-1}{V}_{\mathrm{LS},\mathrm{neg}}=\frac{2-3D}{3(1-D)}{V}_s.$

Ripple current in this pattern is: ${\mathrm{\ΔI}}_s=\frac{V_{\mathrm{LS},\mathrm{pos}}}{L_s}\frac{(3D-1)}{3}{T}_s=\frac{(3D-1)(3D-2)}{9(D-1)}\frac{T_s{V}_s}{L_s}.$

(3)66.7＜D＜100％：

Shown in Fig. 6 C, in a turn-on cycle, all there is the part of overlapping to occur between three signals.Therefore, if under the situation that three switching transistors are opened because of conducting, the voltage at inductance two ends will equate.In this pattern, V _{LS, pos}=V _s

Ripple current is: ${\mathrm{\ΔI}}_s=\frac{V_{\mathrm{Ls},\mathrm{pos}}}{L_s}(D-\frac{2}{3})T_s=\frac{D-2}{3}\frac{T_s{V}_s}{L_s}.$

When the boost converter shown in Fig. 6 D operates in D=33.3%.The electric current of input current and three diodes and only comprise flip-flop.These electric currents are less at input inductance and the stress that electric capacity produced in parallel with load end.At the transducer shown in Fig. 1 and Fig. 2, the phase current of each phase all produces ripple current on boundary point, and after the mutual overlapping of input signal, the ripple of the input current that they are whole can be eliminated each other, and ripple current only appears at the part of switching device shifter.Yet on boundary condition point, its changeover module and passive component will can not produce ripple current to the disclosed direct current with buckling transformer to direct current transducer.Shown in Fig. 6 D, all phase currents are flip-flop.Therefore, the conduction loss of changeover module and passive component is than next little of prior art.In addition,, therefore do not need the technology of current uniform, and have attitude response faster because three-phase current is all equal.

Then, the operating process to direct current transducer of decompression DC with buckling transformer is described.

Similar to direct current transducer with voltage boosting dc, decompression DC also can be divided into three kinds of operator schemes to direct current transducer: (1) D＜33.3%; (2) 33.3%＜D＜66.7%; And (3) 66.7%＜D＜100%.The pass of its output voltage and input voltage is: V _o=DV _s

The fundamental equation of the ripple current of output inductance L O is as follows, and its derivation and the above embodiments are similar, no longer repeat specification.Operation waveform diagram please refer to Fig. 7.

(1)D＜33.3％：

The voltage of output inductance L O both sides: V _{Lo, neg}=DV _s

The ripple current of output inductance L O both sides:

${\mathrm{\ΔI}}_{\mathrm{Lo}}=\frac{V_{\mathrm{Lo},\mathrm{neg}}}{L_o}(\frac{1}{3}-D)T_s=\frac{D(1-3D)}{3}\frac{T_s{V}_s}{L_o}.$

(2)33.3％＜D＜66.7％：

The voltage of output inductance L O both sides: $V_{\mathrm{Lo},\mathrm{neg}}=\frac{3D-1}{3}{V}_s.$

The ripple current of output inductance L O both sides:

${\mathrm{\ΔI}}_{\mathrm{Lo}}=\frac{V_{\mathrm{Lo},\mathrm{neg}}}{L_o}\{D-2\{D-\frac{1}{3}\}{T}_s=\frac{(3D-1)(2-3D)}{9}\frac{T_s{V}_s}{L_o}.$

(3)66.7％＜D＜100％：

The voltage of output inductance L O both sides: V _{Lo, pos}=(1-D) V _s

The ripple current of output inductance L O both sides:

${\mathrm{\ΔI}}_{\mathrm{Lo}}=\frac{V_{\mathrm{Lo},\mathrm{neg}}}{L_o}(D-\frac{2}{3})T_s=\frac{(1-D)(3D-2)}{3}\frac{T_s{V}_s}{L_o}.$

Voltage boosting dc can be via TsVs/Ls normalization to the ripple current of the inductance of direct current transducer, the figure of an one turn-on cycle (duty cycle) please refer to Fig. 8 A, by among the figure as can be known, in the appearance that does not almost have ripple current near near the point the boundary condition, with three phase windings is example, and its boundary condition point that does not have the ripple current appearance is greatly about D=33.3% and D=66.7% part.Therefore, occur in order to reduce ripple current, voltage boosting dc to direct current transducer must boundary condition or near the operating point operation.

The figure of the ripple current of decompression DC after to direct current transducer normalization please refer to Fig. 8 B, by among the figure as can be known, disclosed decompression DC to direct current transducer equally in the appearance that does not almost have ripple current near near the point the boundary condition.Such decompression DC can be widely used in having in the Voltage Regulator Module (VRM) of high current low voltage to direct current transducer.

According to principle of the present invention, disclosed transducer can be applicable to three times of electric current devices (currenttripler).Please refer to Fig. 9 is a kind of insulation type converter with buckling transformer, in this embodiment, needs the iron core of two groups of three-phases.

Isolated DC with buckling transformer shown in Figure 9 includes a bending type buckling transformer 30 to direct current transducer, iron core with three legs, its connected mode, function and operation and the first transistor T1, transistor seconds T2, the 3rd transistor T 3 are similar to the above embodiments.In addition, also include a three-phase transformer 40 and transistor 51～56, three-phase transformer 40 has a primary coil and a level coil, and wherein secondary loops is connected to buckling transformer 30.Transistor 51～56 forms three pairs, and each is to mutual series connection, and each phase winding of the primary coil of transformer 40 is connected to each between the transistor.

According to principle of the present invention, please refer to the 10th figure, be a kind of current multiplication rectifier with buckling transformer.Wherein, transformer is a kind of two-phase buckling transformer that does not have air gap, and its winding connection is shown in the 10th figure.The current multiplication rectifier includes a transformer 70, has elementary winding and secondary winding, and a two-phase buckling transformer 60, and its two phase winding is connected to the secondary winding of transformer 70.

In addition, an output inductance L O is connected to the central point of transformer 60, and load 20 is parallel with a capacitor C.Transistor 57,58 is connected to two phase windings of transformer 60.

In the above description, as an illustration with the transformer of three phase windings.According to the present invention, can become the transducer of heterogeneous structure via the pin number form that increases iron core, as shown in figure 11.Core material is not for having the soft Ferrite (ferrite) of any air gap (airgap), can be applicable to voltage boosting dc transducer, decompression DC transducer, Cuk transducer, single ended primary induction transducer (Single-Ended PrimaryInductance Converter, SEPIC), insulation type converter or the like, also can use the manifold type inductance of vomitting of the bending type with air gap.In addition, according to the present invention, other direct current also can replace by buckling transformer the electric current smoothing inductor in the direct current transducer (current smoothing inductor).In the embodiment of heterogeneous structure, when all winding voltages all during balance, if there is the electric current of winding will equate i ₁=i ₂=...=i _N-1, n 〉=2, wherein n is the number of phases.Output/incoming frequency then is n a times of switching frequency.The turn-on cycle D of boundary condition _nDecide according to the number of phases: Dn=h/n, h=1,2 ..., n-1.

Figure 12 A and Figure 12 B are respectively the voltage vector diagram of four phase structures and five phase structure transducers.From Fig. 3 and Figure 12 A～Figure 12 B as can be known, the ratio of winding voltage is as follows:

${\mathrm{<figure-callout\; id="1"\; label="V\; z"\; filenames="A20041006419800191.png,A20041006419800201.png"\; state="\{\{state\}\}">V</figure-callout>}}_z=\frac{1}{\sqrt{3}}{V}_{1N}=0.577V_{1N},(n=3)$

${\mathrm{<figure-callout\; id="1"\; label="V\; z"\; filenames="A20041006419800191.png,A20041006419800201.png"\; state="\{\{state\}\}">V</figure-callout>}}_z=\frac{1}{\sqrt{2}}{V}_{1N}=0.707V_{1N},(n=4)$

Winding voltage is determined by the angle between transformer two windings.The operation waveform diagram of four phase structures shown in Figure 13.

The output voltage of disclosed three-phase voltage increasing transducer is 48 volts, 200 watts of power.Switching frequency is set at 167kHz.And use the input inductance of a low capacity.The present invention gives up three different signals of sensing and the single current signal of sensing only.

Experimental result please refer to the 14th figure and Figure 15.By the 14th figure can, under the technology of not using current uniform, the present invention can obtain three equal electric currents.Turn-on cycle is approximately 25%.The frequency of input current and the summation of diode current are three times (500kHz) of switching frequency.Figure 14 A is depicted as the winding voltage of primary coil and secondary coil.Operation waveform shown in Figure 15 is with near the boundary condition the operating point adjustment turn-on cycle D=33.3% of transducer.Input voltage is 32 volts, and output voltage is 45 volts (direct currents).Three input currents are flip-flop, and ripple current shown in the figure is quite small, does not almost have.And stream claims that the electric current of Transformer Winding is all equal, and the electric current on changeover module does not have ripple yet.

To direct current transducer, its transformer can make the phase current of each phase equate automatically according to the direct current of disclosed heterogeneous high-frequency buckling transformer.Therefore,, only need electric current of sensing, do not need to make Current Control be simplified current uniform for heterogeneous (more than the two-phase) structure.In addition, when transducer is set in the operating point of boundary condition, can eliminate ripple current, and have transient response faster.

Though the present invention discloses as above with aforesaid embodiment, so it is not in order to limit the present invention.Without departing from the spirit and scope of the present invention, change of doing and retouching all belong to scope of patent protection of the present invention.Please refer to appended claim about the protection range that the present invention defined.

Claims (27)

1. a multiphase DC is to DC boost converter, comprising:

One bending type device has N and props up iron core, and wherein N is the number of phases more than or equal to 2;

A plurality of diodes, the P type side of each this diode is coupled to each leg of this iron core of this bending type device; And

A plurality of transistors, each this transistor drain is coupled to each leg of this iron core of this bending type device.

2. multiphase DC as claimed in claim 1 is to DC boost converter, it is characterized in that this bending type device is one not have the autotransformer of isolation.

3. multiphase DC as claimed in claim 1 is to DC boost converter, and this N that it is characterized in that this bending type device props up iron core and do not have air gap, to form a buckling transformer.

4. multiphase DC as claimed in claim 1 is to DC boost converter, and this N that it is characterized in that this bending type device props up iron core and has air gap, to form a bending type manifold type inductance.

5. multiphase DC as claimed in claim 1 is characterized in that to DC boost converter each leg of this iron core of this bending type device has two coils.

6. multiphase DC as claimed in claim 1 is characterized in that also including an input inductance to DC boost converter, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

7. multiphase DC as claimed in claim 6 is characterized in that to DC boost converter this ripple current is eliminated under boundary condition.

8. multiphase DC as claimed in claim 7 is to DC boost converter, and the work period that it is characterized in that this boundary condition is h/N, h=1 wherein, and 2,3 ..., N-1.

9. multiphase DC as claimed in claim 1 is characterized in that to DC boost converter this transistorized grid is in order to receive suitable phase shift signalling.

10. a multiphase DC is to DC decompression converter, comprising:

One bending type device has N and props up iron core, and wherein N is the number of phases more than or equal to 2; And

Many to transistor, each connects with series system transistor, and each leg of this iron core is connected between this every pair transistor.

11. multiphase DC as claimed in claim 10, is characterized in that this bending type device is one not have the autotransformer of isolation to DC decompression converter.

12. multiphase DC as claimed in claim 10, is characterized in that this N of this bending type device props up iron core and do not have air gap to DC decompression converter, to form a buckling transformer.

13. multiphase DC as claimed in claim 10, is characterized in that this N of this bending type device props up iron core and has air gap to DC decompression converter, to form a bending type manifold type inductance.

14. multiphase DC as claimed in claim 10, is characterized in that each leg of this iron core of this bending type device has two coils to DC decompression converter.

15. multiphase DC as claimed in claim 10 to DC decompression converter, is characterized in that also including an output inductance, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

16. multiphase DC as claimed in claim 15, is characterized in that this ripple current is eliminated to DC decompression converter under boundary condition.

17. multiphase DC as claimed in claim 16, is characterized in that the work period of this boundary condition is h/N to DC decompression converter, h=1 wherein, and 2,3 ..., N-1.

18. multiphase DC as claimed in claim 10, is characterized in that this transistorized grid is in order to receive suitable phase shift signalling to DC decompression converter.

19. an isolated DC is to direct current transducer, comprising:

One buckling transformer has the iron core of one or three legs;

One three-phase transformer has a primary coil and a level coil, and wherein this secondary coil is connected to this buckling transformer;

Three pairs of transistors, each connects with series system transistor, and each phase winding of the primary coil of this three-phase transformer is connected between this every pair transistor; And

One first, second, third transistor, each transistor drain are coupled to each leg of this iron core of this bending type device.

20. isolated DC as claimed in claim 19, is characterized in that each leg of this iron core of this buckling transformer has two coils to direct current transducer.

21. isolated DC as claimed in claim 20 to direct current transducer, is characterized in that also including an input inductance, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

22. isolated DC as claimed in claim 21, is characterized in that this ripple current is eliminated to direct current transducer under boundary condition.

23. isolated DC as claimed in claim 22 is to direct current transducer, wherein the work period of this boundary condition is 1/3 or 2/3.

24. isolated DC as claimed in claim 19, is characterized in that this first, second, third transistorized grid is in order to receive suitable phase shift signalling to direct current transducer.

25. a twice current rectifier, comprising having:

One buckling transformer has two-phase; And

One transformer has a primary coil and a level coil, and wherein this secondary coil is connected to this buckling transformer.

26. twice current rectifier as claimed in claim 25 is characterized in that also including an output inductance, is coupled to this bending type device, in order to eliminate the ripple current of this transducer.

27. twice current rectifier as claimed in claim 25 is characterized in that also including two transistor, is connected to the coil of this two-phase of this buckling transformer respectively.

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