CN102223091A - AC (alternating-current)/DC (direct-current) converter - Google Patents
AC (alternating-current)/DC (direct-current) converter Download PDFInfo
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- 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
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Abstract
The invention discloses an AC (alternating-current)/DC (direct-current) converter, comprising a PFC (power factor correction) circuit and a DC/DC converter coupled with one output end of the PFC circuit, wherein the PFC circuit is a PFC circuit without a rectifying bridge; the DC/DC converter comprises an LLC (logical link control) circuit, a transformer and a synchronous rectifying circuit; the output end of the PFC circuit is connected with an input end of the LLC circuit; an output end of the LLC circuit is connected with a primary winding of the transformer; and a secondary winding of the transformer is connected with an input end of the synchronous rectifying circuit. The AC/DC converter can reduce circuit losses and improves power supply efficiency and power density.
Description
Technical field
The present invention relates to Switching Power Supply, particularly relate to a kind of AC/DC (ac/dc) converter.
Background technology
For the AC/DC converter, generally by PFC (Power Factor Correction, PFC) and DC/DC (DC-DC) two-stage circuit form.Pfc circuit is used for realizing the calibration function of rectification function and power factor, makes the input current of AC/DC converter follow the tracks of input voltage on the basis that is converted to direct current from interchange, improves the power factor (PF) of power supply, reduces the Harmonic Interference of power supply.The input of the output termination DC/DC converter of pfc circuit, DC/DC converter by diode rectification, become direct current with AC rectification after earlier direct current being transformed into the alternating current of high frequency again.
Figure 1 shows that AC/DC converter topology commonly used, wherein, power supply AC is an alternating current input power supplying, diode D1～D4 constitutes rectifier bridge, inductance L 1 is the BOOST inductance, and diode D5 is the BOOST stream diode that continues, and capacitor C 1 is a dc-link capacitance, 1 has constituted traditional BOOST converter from power supply AC to capacitor C, is used for realizing the function of PFC.Switching tube S1～S4 is 4 switching tubes of DC/DC converter, inductance L 2 is to be used for realizing that no-voltage opens (Zero Vo1tage Switch, ZVS) inductance, capacitor C 2 is a capacitance, T1 is a transformer, diode D6, D7 constitute full-wave rectifying circuit, and inductance L 3 is an outputting inductance, and capacitor C o is an output capacitance.Constituted the DC/DC converter of a phase-shifting full-bridge from switching tube S1 to capacitor C o, direct current has been transformed to direct current.
But above-mentioned AC/DC converter exists following deficiency:
1. input current flows through rectifier bridge diode D1～D4, makes that the loss on the rectifier bridge is bigger, and the efficient of power supply is difficult to further lifting.
2.DC/DC the topological structure of converter using phase-shifting full-bridge, lagging leg are not easy to realize ZVS.
3. because DC/DC adopts phase shifting control, make output diode D6, D7 be difficult to accomplish zero-current switching (Zero Current Switch is called for short ZCS), the switching loss on output diode is bigger.
4. output has an inductance that volume is bigger, the power density of power supply to be difficult to promote.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of AC/DC converter is provided, and can reduce circuit loss, improves power-efficient and power density.
For achieving the above object, the present invention is by the following technical solutions:
A kind of AC/DC converter, comprise pfc circuit and the DC/DC converter that is coupling in described pfc circuit output, it is characterized in that, described pfc circuit is the non-rectifying bridge pfc circuit, described DC/DC converter comprises LLC circuit, transformer and circuit of synchronous rectification, the input of the described LLC circuit of output termination of described pfc circuit, the former limit winding of the described transformer of output termination of described LLC circuit, the secondary winding of described transformer connects the input of described circuit of synchronous rectification.
Preferably, described pfc circuit is single-phase non-bridge PFC circuits, described single-phase non-bridge PFC circuits comprises first inductance, second inductance, the first stream diode that continues, the second stream diode that continues, the one PFC switching tube, the female stream of the 2nd PFC switching tube and direct current electric capacity, one end of one termination alternating current input power supplying of described first inductance, another termination of described first inductance described first continue a stream anode of diode and an end of described the 2nd PFC switching tube, the other end of the described alternating current input power supplying of one termination of described second inductance, described second inductance another termination described second continue a stream anode of diode and an end of a described PFC switching tube, one end of the female stream of the described direct current of another termination of a described PFC switching tube and described the 2nd PFC switching tube electric capacity, another termination described first of the female stream of described direct current electric capacity the continue negative electrode of stream diode of stream diode and described second that continues.
Preferably, described LLC circuit is a three-phase LLC circuit, described three-phase LLC circuit comprises a phase brachium pontis, b phase brachium pontis, c phase brachium pontis, first resonant inductance, second resonant inductance, the 3rd resonant inductance, first resonant capacitance, second resonant capacitance, the 3rd resonant capacitance, first magnetizing inductance, second magnetizing inductance and the 3rd magnetizing inductance, the a that described a phase brachium pontis comprises series connection is first switching tube and a second switch pipe mutually mutually, the b that described b phase brachium pontis comprises series connection is first switching tube and b second switch pipe mutually mutually, the c that described c phase brachium pontis comprises series connection is first switching tube and c second switch pipe mutually mutually, the former limit winding of described transformer comprises former limit first winding, former limit second winding and the former limit tertiary winding, the mid point of the described a phase of the one termination brachium pontis of described first resonant inductance, one end of described first resonant capacitance of another termination of described first resonant inductance, one end of the described former limit of another termination of described first resonant capacitance first winding, the mid point of the described b phase of the one termination brachium pontis of described second resonant inductance, one end of described second resonant capacitance of another termination of described second resonant inductance, one end of the described former limit of another termination of described second resonant capacitance second winding, the mid point of the described c phase of the one termination brachium pontis of described the 3rd resonant inductance, one end of described the 3rd resonant capacitance of another termination of described the 3rd resonant inductance, one end of the described former limit of another termination tertiary winding of described the 3rd resonant capacitance, described former limit first winding, the other end interconnection of described former limit second winding and the described former limit tertiary winding.
Preferably, described first magnetizing inductance, second magnetizing inductance and the 3rd magnetizing inductance are to provide or adopt external inductance by the former limit of described transformer winding.
Preferably, described transformer is a transformer that adopts connection of △ shape or Y shape to connect.
Preferably, described transformer comprises a plurality of discrete transformer, and each described discrete transformer is corresponding to each phase of described LLC circuit.
Preferably, described circuit of synchronous rectification is a bridge rectifier.
Preferably, described circuit of synchronous rectification is a full-wave rectifying circuit.
Preferably, described pfc circuit is the three-phase non-bridge PFC circuits.
Preferably, described LLC circuit is four phase or four above mutually LLC circuit.
Beneficial technical effects of the present invention is:
In the AC/DC converter of the present invention, pfc circuit adopts the non-rectifying bridge pfc circuit, the DC/DC converter using comprises the DC/DC converter of LLC circuit, adopt this AC/DC topological structure, saved the rectifier bridge of AC/DC converter importation, so can not cause loss because of the diode that input current flows through on the rectifier bridge, therefore promoted the efficient of PFC greatly, simultaneously, DC/DC converter using LLC resonant circuit, can realize the ZVS (labor is asked for an interview the LLC circuit working principle of describing among the embodiment) of the former limit of transformer switching tube, again owing to be sinusoidal wave, so the waveform after the rectification of transformer secondary is the absolute value of primary current through LLC circuit to the electric current on the former limit of transformer, promptly waveform is become positive for negative partial rectification, when sinusoidal wave zero crossing, the secondary rectifying tube turn-offs naturally like this, thereby realizes the ZCS of secondary rectifying tube, therefore, the present invention had both reduced the loss of former limit switching tube, had reduced the loss of secondary rectifying tube again, had therefore promoted the efficient of AC/DC converter greatly.In addition,, make output no longer need very big inductance, promoted the power density of power supply so greatly owing to adopt the topological structure of LLC.The DC/DC converter preferably includes three-phase LLC circuit, adopts the DC/DC converter of three-phase can make the current ripples of output become very little, therefore the filter volume that can also reduce to export.
Description of drawings
Fig. 1 adds the AC/DC topology diagram of phase-shifted full-bridge converter for existing BOOST PFC;
Fig. 2 is the topology diagram of AC/DC converter embodiment one of the present invention;
Fig. 3 is the topology diagram of the present invention's non-bridge PFC shown in Figure 2;
Fig. 4 is the drive waveforms of the present invention's non-bridge PFC shown in Figure 2;
Fig. 5 is the driving sequential of the present invention three-phase LLC shown in Figure 2;
Fig. 6 is the current waveform figure of the present invention three-phase LLC shown in Figure 2;
Fig. 7 is the present invention each brachium pontis mid point a of three-phase LLC shown in Figure 2, the voltage oscillogram of b, c;
Fig. 8 is the topology diagram of AC/DC converter embodiment two of the present invention;
Fig. 9 is the topology diagram of AC/DC converter embodiment three of the present invention;
Figure 10 is the topology diagram of AC/DC converter embodiment four of the present invention;
Figure 11 is the topology diagram of AC/DC converter embodiment five of the present invention.
Embodiment
In conjunction with the accompanying drawings the present invention is further described in detail by the following examples.
AC/DC converter of the present invention comprises pfc circuit and is coupling in the DC/DC converter of pfc circuit output, pfc circuit is the non-rectifying bridge pfc circuit, the DC/DC converter comprises LLC circuit, transformer and circuit of synchronous rectification, the input of the output termination LLC circuit of pfc circuit, the former limit winding of the output termination transformer of LLC circuit, the secondary winding of transformer connects the input of circuit of synchronous rectification.According to AC/DC converter scheme of the present invention, PFC wherein partly adopts the topological structure of non-bridge PFC circuits, DC/DC partly adopts the topological structure of LLC circuit, the topological structure of this AC/DC can obtain the high efficiency and the high power density of power supply, will make specific description to the advantage of this topological structure among the following embodiment.
Embodiment one
Please refer to Fig. 2, the single-phase non-bridge PFC circuits of AC/DC converter using of present embodiment, three-phase LLC circuit, transformer add the topological structure of circuit of synchronous rectification.
Wherein, single-phase non-bridge PFC circuits comprises first inductance L 1, second inductance L 2, first continues flows diode D1, second continues flows diode D2, the one PFC switching tube S1, the female stream of the 2nd PFC switching tube S2 and direct current capacitor C 1, the end of one termination alternating current input power supplying AC of first inductance L 1, another termination first of first inductance L 1 the continue anode of stream diode D1 and the end of the 2nd PFC switching tube S2, the other end of one termination alternating current input power supplying AC of second inductance L 2, another termination second of second inductance L 2 the continue anode of stream diode D2 and the end of a PFC switching tube S1, one end of the female stream of another termination direct current of the one PFC switching tube S1 and the 2nd PFC switching tube S2 capacitor C 1, another termination first of the female stream of direct current capacitor C 1 the continue negative electrode of stream diode D2 of stream diode D1 and second that continues.The equivalent electric circuit topology of single-phase non-bridge PFC circuits is as Fig. 3, and this pfc circuit adopts two switching tubes and two diodes to divide two groups of series connection, has both realized the rectification function to the input AC electricity, has realized the power of Active PFC again.Because the topological structure of this non-bridge PFC has saved the rectifier bridge of input,, therefore promoted the efficient of PFC greatly so can not cause loss because of the diode that input current flows through on the rectifier bridge.
As shown in Figure 2, described three-phase LLC circuit comprises a phase brachium pontis, b phase brachium pontis, c phase brachium pontis, the first resonant inductance Lr1, the second resonant inductance Lr2, the 3rd resonant inductance Lr3, the first resonant capacitance Cr1, the second resonant capacitance Cr2, the 3rd resonant capacitance Cr3, the first magnetizing inductance Lm1, the second magnetizing inductance Lm2 and the 3rd magnetizing inductance Lm3, the a that a phase brachium pontis comprises series connection is the first switching tube Sa1 and a second switch pipe Sa2 mutually mutually, the b that b phase brachium pontis comprises series connection is the first switching tube Sb3 and b second switch pipe Sb4 mutually mutually, and the c that c phase brachium pontis comprises series connection is the first switching tube Sc5 and c second switch pipe Sc6 mutually mutually.Transformer is the three-phase transformer that comprises three discrete transformer, each discrete transformer is corresponding to each phase of LLC circuit, wherein first discrete transformer comprises former limit first winding P1 and the secondary first winding N1, second discrete transformer comprises former limit second winding P2 and the secondary second winding N2, and the 3rd discrete transformer comprises former limit tertiary winding P3 and secondary tertiary winding N3.The mid point of the termination a phase brachium pontis of the first resonant inductance Lr1, the end of another termination first resonant capacitance Cr1 of the first resonant inductance Lr1, the end of the former limit first winding P1 of another termination of the first resonant capacitance Cr1, the mid point of the termination b phase brachium pontis of the second resonant inductance Lr2, the end of another termination second resonant capacitance Cr2 of the second resonant inductance Lr2, the end of the former limit second winding P2 of another termination of the second resonant capacitance Cr2, the mid point of the termination c phase brachium pontis of the 3rd resonant inductance Lr3, the end of another termination the 3rd resonant capacitance Cr3 of the 3rd resonant inductance Lr3, the end of the former limit of another termination tertiary winding P3 of the 3rd resonant capacitance Cr3, the former limit first winding P1, the other end interconnection of former limit second winding P2 and former limit tertiary winding P3 constitutes Y shape and connects.The first magnetizing inductance Lm1, the second magnetizing inductance Lm2 and the 3rd magnetizing inductance Lm3 are provided by the former limit of transformer winding in the present embodiment.The first magnetizing inductance Lm1, the second magnetizing inductance Lm2 and the 3rd magnetizing inductance Lm3 also can adopt external inductance.
Circuit of synchronous rectification is a full-wave rectifying circuit, comprises the first synchronous rectifier Sr1, the second synchronous rectifier Sr2, the 3rd synchronous rectifier Sr3, the 4th synchronous rectifier Sr4, the 5th synchronous rectifier Sr5, the 6th synchronous rectifier Sr6 and output filter capacitor C
0The secondary first winding N1 of transformer secondary, secondary second winding N2 and secondary tertiary winding N3 are three and are with centre tapped winding, the centre cap of three windings of secondary links together and forms the anode of output, the two ends of the secondary first winding N1 connect the end of the first synchronous rectifier Sr1 and the second synchronous rectifier Sr2 respectively, the two ends of the secondary second winding N2 connect the end of the 3rd synchronous rectifier Sr3 and the 4th synchronous rectifier Sr4 respectively, the two ends of secondary tertiary winding N3 connect the end of the 5th synchronous rectifier Sr5 and the 6th synchronous rectifier Sr6 respectively, the other end of the first～six synchronous rectifier links together, the negative terminal of forming output, output filter capacitor C
0Be connected between the anode, negative terminal of output, the anode of output, negative terminal are connected to load R respectively
0Two ends.
See also Fig. 2 to Fig. 4, the operation principle of present embodiment pfc circuit is as follows:
When the input voltage of alternating current input power supplying AC is timing, during t0～t1, the one PFC switching tube S1 and the 2nd PFC switching tube S2 are open-minded simultaneously, and this moment, flow through first inductance L 1, the 2nd PFC switching tube S2, a PFC switching tube S1 and second inductance L 2 of electric current returned power supply negative terminal.During t1～t2, a PFC switching tube S1 and the 2nd PFC switching tube S2 turn-off, and electric current the continue body diode and second inductance L 2 of stream diode D1, a PFC switching tube S1 of first inductance L 1, first of flowing through got back to power supply negative terminal.When the input voltage that exchanges input AC when negative, operating state and input voltage are that timing is similar.
See also Fig. 2, Fig. 5 to Fig. 7, wherein a mutually the first switching tube Sa1, b mutually the first switching tube Sb3 and c mutually three drive signals of the first switching tube Sc5 differ 120 and spend, a is the drive signal and a drive signal complementation of second switch pipe Sa2 mutually of the first switching tube Sa1 mutually, b is the drive signal and the b drive signal complementation of second switch pipe Sb4 mutually of the first switching tube Sb3 mutually, c is the drive signal and the c drive signal complementation of second switch pipe Sc6 mutually of the first switching tube Sc5 mutually, and concrete driving sequential as shown in Figure 5.The electric current of three-phase also differs 120 degree on phase place, the waveform of DC/DC converter current as shown in Figure 6.The voltage that a, b, c are ordered with respect to the voltage waveform of transformer mid point N as shown in Figure 7.The operation principle of present embodiment DC/DC converter is as follows:
Stage 1:t0～t1
The a first switching tube Sa1 mutually begins conducting, this moment, the pipe of conducting had a first switching tube Sa1 mutually together, b phase second switch pipe Sb4 and c be the first switching tube Sc5 mutually, the electric current of the first resonant inductance Lr1 reduces gradually, the electric current negative sense of the first magnetizing inductance Lm1 reduces (to establish electric current from down to up for just, from top to bottom for negative), the electric current forward of the 3rd resonant inductance Lr3 increases (establishes electric current direction from left to right for just, electric current direction from right to left is for negative), the electric current forward of the 3rd magnetizing inductance Lm3 increases, the a first switching tube Sa1 mutually flows through this moment, the first resonant inductance Lr1, the first resonant capacitance Cr1, the electric current of the first magnetizing inductance Lm1 and the c first switching tube Sc5 mutually that flows through, the 3rd resonant inductance Lr3, the 3rd resonant capacitance Cr3, the electric current of the 3rd magnetizing inductance Lm3 converges to b phase second switch pipe Sb4, the second resonant inductance Lr2, the branch road of the second resonant capacitance Cr2, the current reversal of the second resonant inductance Lr2 increases, and the second magnetizing inductance Lm2 electric current negative sense increases.After the first switching tube Sa1 conducting of a phase, forward voltage is born at the first resonant inductance Lr1 two ends, and power supply transmits energy from the former limit of transformer to the transformer secondary, and this moment, the electric current of the first resonant inductance Lr1 began linear the rising, and the first switching tube Sa1 turn-offs until a phase.
Stage 2:t1～t2
The c first switching tube Sc5 mutually turn-offs, and this moment, resonance current began the discharge to c phase second switch pipe Sc6, makes that the voltage at c phase second switch pipe Sc6 two ends is zero, and c phase second switch pipe Sc6 begins conducting, has promptly realized ZVS.This moment, the pipe of conducting had a first switching tube Sa1 mutually together, b phase second switch pipe Sb4 and c be second switch pipe Sc6 mutually, and the first switching tube Sa1, the first resonant inductance Lr1, first this branch road of resonant capacitance Cr1 flow to b phase second switch pipe Sb4, the second resonant inductance Lr2, the second resonant capacitance Cr2 branch road and c second switch pipe Sc6, the 3rd resonant inductance Lr3, the 3rd resonant capacitance Cr3 branch road mutually to electric current mutually by a.Make the electric current of the second resonant inductance Lr2 and the 3rd resonant inductance Lr3 begin to reduce like this, the current reversal of the second magnetizing inductance Lm2 increases, and the electric current forward of the 3rd magnetizing inductance Lm3 increases, and the electric current of the first resonant inductance Lr1 continues to increase.The first magnetizing inductance Lm1 electric current oppositely reduces earlier, and forward increases after the zero crossing.
Stage 3:t2～t3
B phase second switch pipe Sb4 turn-offs, and this moment, resonance current began the first switching tube Sb3 discharge mutually to b, makes that the voltage at the b phase first switching tube Sb3 two ends is zero, and the b first switching tube Sb3 mutually begins conducting, has promptly realized ZVS.This moment, the pipe of conducting had a first switching tube Sa1 mutually together, b is the first switching tube Sb3 and c second switch pipe Sc6 mutually mutually, electric current is by a phase first switching tube Sa1, the first resonant inductance Lr1, the first resonant capacitance Cr1 branch road and b be the first switching tube Sb3 mutually, the second resonant inductance Lr2, the second resonant capacitance Cr2 branch road c phase second switch pipe Sc6 branch road of flowing through, the 3rd resonant inductance Lr3, the 3rd resonant capacitance Cr3 branch road, the electric current of the first resonant inductance Lr1 continues forward and rises, the electric current forward of the first magnetizing inductance Lm1 increases, the second resonant inductance Lr2 bears forward voltage, because previous moment has the negative current second resonant inductance Lr2 that flows through, the electric current of the second resonant inductance Lr2 began negative sense and reduced this moment, and the second magnetizing inductance Lm2 electric current negative sense reduces.The sense of current of the 3rd resonant inductance Lr3 is constant, and continuing oppositely increases, and the electric current of the 3rd magnetizing inductance Lm3 forward before this reduces, and zero crossing after-current negative sense increases.
Stage 4:t3～t4
The a first switching tube Sa1 mutually turn-offs, this moment, resonance current began to discharge to a phase second switch pipe Sa2, make that the voltage at a phase second switch pipe Sa2 two ends is zero, the a first switching tube Sa2 mutually begins conducting, promptly realized ZVS, this moment, the pipe of conducting had a phase second switch pipe Sa2 together, b is the first switching tube Sb3 and c second switch pipe Sc6 mutually mutually, and electric current is by the b first switching tube Sb3 mutually, the second resonant inductance Lr2, the second resonant capacitance Cr2 branch road a phase second switch pipe Sa2 that flows through, the first resonant inductance Lr1, the first resonant capacitance Cr1 branch road and c be second switch pipe Sc6 mutually, the 3rd resonant inductance Lr3 and the 3rd resonant capacitance Cr3 branch road.This moment, reverse voltage was born at the first resonant inductance Lr1 two ends, inductive current begins forward and reduces, but direction is still for just, the first magnetizing inductance Lm1 electric current continued to increase before this, when the electric current of the electric current of the first magnetizing inductance Lm1 and the first resonant inductance Lr1 equated, the electric current of the first magnetizing inductance Lm1 began to descend.The 3rd resonant inductance Lr3 bears forward voltage, but because the electric current that flows through of previous moment is a negative sense, therefore this moment the 3rd resonant inductance Lr3 electric current begin negative sense and reduce, the electric current of the 3rd magnetizing inductance Lm3 begins negative sense and increases.The second resonant inductance Lr2 bears forward voltage, and inductive current begins forward to be increased, and the electric current of second magnetizing inductance Lm2 negative sense before this reduces, and forward increases behind the zero crossing.
Stage 5:t4～t5
C phase second switch pipe Sc6 turn-offs, and this moment, resonance current began the first switching tube Sc5 discharge mutually to c, makes that the voltage at the c phase first switching tube Sc5 two ends is zero, and the c first switching tube Sc5 mutually begins conducting, has promptly realized ZVS.This moment, the conducting pipe had the mutually first switching tube Sb3 and the c first switching tube Sc5 mutually of a phase second switch pipe Sa2, b together.Electric current is by the b first switching tube Sb3, the second resonant inductance Lr2, the second resonant capacitance Cr2 branch road and c flow through a phase second switch pipe Sa2, the first resonant inductance Lr1, the first resonant capacitance Cr1 branch road of the first switching tube Sc5, the 3rd resonant inductance Lr3, the 3rd resonant inductance Cr3 branch road mutually mutually.This moment, the first resonant inductance Lr1 still bore reverse voltage, and inductive current begins negative sense to be increased, and the electric current of first magnetizing inductance Lm1 forward before this reduces, and zero crossing after-current negative sense increases.The second resonant inductance Lr2 continues to bear forward voltage, and the inductive current forward increases, and the electric current forward of the second magnetizing inductance Lm2 increases.The 3rd resonant inductance Lr3 bears forward voltage, but this moment, electric current still was a negative sense, therefore showed as negative sense and reduced, and the 3rd magnetizing inductance Lm3 electric current negative sense reduces.
Stage 6:t5～t6
The b first switching tube Sb3 mutually turn-offs, and this moment, resonance current began the discharge to b phase second switch pipe Sb4, makes that the voltage at b phase second switch pipe Sb4 two ends is zero, and this moment, b phase second switch pipe Sb4 conducting promptly realized ZVS.This moment, the pipe of conducting had a phase second switch pipe Sa2, b phase second switch pipe Sb4 and the c first switching tube Sc5 mutually together.Electric current is by c flow through b phase second switch pipe Sb4, the second resonant inductance Lr2, the second resonant capacitance Cr2 branch road and a second switch pipe Sa2, the first resonant inductance Lr1, the first resonant capacitance Cr1 branch road mutually of the first switching tube Sc5, the 3rd resonant inductance Lr3, the 3rd resonant capacitance Cr3 branch road mutually.This moment, the 3rd resonant inductance Lr3 bore forward voltage, electric current begins forward to be increased, the 3rd magnetizing inductance Lm3 electric current elder generation negative sense reduces, forward increases behind the zero crossing, the second resonant inductance Lr2 bears reverse voltage, and electric current begins forward and reduces, and the second magnetizing inductance Lm2 electric current continues to increase, when the second magnetizing inductance Lm2 electric current equated with the second resonant inductance Lr2 electric current, the second magnetizing inductance Lm2 electric current began to descend.The amplitude that the amplitude that this moment, the 3rd resonant inductance Lr3 forward increased does not have the second resonant inductance Lr2 forward to reduce is big, therefore the total electric current of the first resonant inductance Lr1 still is a negative sense, but beginning reduces gradually, the first magnetizing inductance Lm1 electric current continues negative sense to be increased, when the first magnetizing inductance Lm1 electric current equated with the first resonant inductance Lr1 electric current, the first magnetizing inductance Lm1 electric current began negative sense and reduces.
Crossed t6 after the moment, converter has begun the another one cycle again, and beginning constantly repeats the above course of work.
Because the electric current that the former limit of transformer provides through the LLC circuit is sinusoidal wave, the waveform of transformer secondary after rectification is the absolute value of primary current, and be promptly positive for negative part is made into waveform, like this when sinusoidal wave zero crossing, the secondary rectifying tube turn-offs naturally, has promptly realized ZCS.
Embodiment two
Please refer to Fig. 8, the AC/DC converter of present embodiment still adopts single-phase non-bridge PFC circuits, three-phase LLC circuit, transformer to add the topological structure of circuit of synchronous rectification, but has following difference with embodiment one:
1) transformer in the present embodiment is not to adopt three independently transformers, but adopt the three-phase transformer of a coupling, the former limit of this three-phase transformer and secondary adopt Y shape connected mode, the former limit of transformer comprises former limit first winding, former limit second winding and the former limit tertiary winding, the transformer secondary comprises secondary first winding, secondary second winding and the secondary tertiary winding, former limit first winding, one end mutual connection of former limit second winding and the former limit tertiary winding forms Y shape, the other end of former limit first winding connects the first resonant capacitance Cr1 of LLC circuit, the other end of former limit second winding connects the second resonant capacitance Cr2 of LLC circuit, the other end of the former limit tertiary winding connects the 3rd resonant capacitance Cr3 of LLC circuit, secondary first winding, one end of secondary second winding and the secondary tertiary winding also mutual connection forms Y shape.Compare with adopting a plurality of separate single-phase transformers, the three-phase transformer of a coupling of employing has further improved the utilization ratio of transformer, has reduced the core loss of transformer.
2) circuit of synchronous rectification in the present embodiment is a bridge rectifier, comprises the first synchronous rectifier Sr1, the second synchronous rectifier Sr2, the 3rd synchronous rectifier Sr3, the 4th synchronous rectifier Sr4, the 5th synchronous rectifier Sr5, the 6th synchronous rectifier Sr6 and output filter capacitor C
0The end of the first synchronous rectifier Sr1 and the second synchronous rectifier Sr2 is connected to form first brachium pontis, the end of the 3rd synchronous rectifier Sr3 and the 4th synchronous rectifier Sr4 is connected to form second brachium pontis, the end of the 5th synchronous rectifier Sr5 and the 6th synchronous rectifier Sr6 is connected to form the 3rd brachium pontis, secondary first winding of transformer connects the mid point of first brachium pontis, secondary second winding of transformer connects the mid point of second brachium pontis, the secondary tertiary winding of transformer connects the mid point of the 3rd brachium pontis, the first synchronous rectifier Sr1, the 3rd synchronous rectifier Sr3, the other end of the 5th synchronous rectifier Sr5 links together, the anode of forming output, the second synchronous rectifier Sr2, the 4th synchronous rectifier Sr4, the other end of the 6th synchronous rectifier Sr6 links together, the negative terminal of forming output, output filter capacitor C
0Be connected between the anode, negative terminal of output, the anode of output, negative terminal are connected to load R respectively
0Two ends.
Because adopt non-bridge PFC circuits to add the topology of LLC circuit, the AC/DC converter of present embodiment can obtain the high efficiency and the high power density of power supply equally.Just realize PFC and DC/DC conversion, circuit working principle that present embodiment is basic and embodiment one are similarly, specify and see also embodiment one.
Embodiment three
Please refer to Fig. 9, the AC/DC converter of present embodiment still adopts single-phase non-bridge PFC circuits, three-phase LLC circuit, transformer to add the topological structure of circuit of synchronous rectification, only is that with the difference of embodiment two the former secondary of transformer has adopted △ shape connected mode.As understood by the skilled person, under this situation, winding corresponding changing in three former limits of three-phase LLC circuit and transformer is adapted to being connected of △ shape connected mode, and similarly, corresponding the changing into of three secondary windings of circuit of synchronous rectification and transformer is adapted to being connected of △ shape connected mode.
Because adopt non-bridge PFC circuits to add the topology of LLC circuit, the AC/DC converter of present embodiment can obtain the high efficiency and the high power density of power supply equally.Just realize PFC and DC/DC conversion, circuit working principle that present embodiment is basic and embodiment one are similarly, specify and see also embodiment one.
Embodiment four
Please refer to Figure 10, embodiment four adopts non-bridge PFC circuits, four phase LLC circuit, transformer to add the topological structure of four synchronised rectification circuits.
The transformer of present embodiment and embodiment one are similar, but are four phases, so adopt four separated transformers.Compare with embodiment two, the difference of present embodiment is that the LLC circuit expands to four phases by three-phase, the relative three-phase LLC of four phase LLC circuit circuit increases d phase brachium pontis, the d that d phase brachium pontis comprises series connection is the first switching tube Sd7 and d second switch pipe Sd8 mutually mutually, simultaneously, circuit of synchronous rectification also expands to four phases by three-phase, and the relative three-phase synchronous rectification circuit of four synchronised rectification circuits has increased the 4th brachium pontis of being made up of the 7th synchronous rectifier Sr7 and the 8th synchronous rectifier Sr8.By that analogy, the DC/DC converter among the present invention can also adopt five phases, six to equate more heterogeneous topology.
Because adopt non-bridge PFC circuits to add the topology of LLC circuit, the AC/DC converter of present embodiment can obtain the high efficiency and the high power density of power supply equally.Just realize PFC and DC/DC conversion, circuit working principle that present embodiment is basic and embodiment one are similarly, specify and see also embodiment one.
Embodiment five
Please refer to Figure 11, the AC/DC converter using three-phase non-bridge PFC circuits of present embodiment, three-phase LLC circuit, transformer add the topological structure of circuit of synchronous rectification, only be that with the difference of embodiment two single-phase non-bridge PFC circuits expands to the three-phase non-bridge PFC circuits, three-phase LLC circuit has also carried out corresponding change.This non-bridge PFC circuits comprises three-phase input power supply A, B, C, three PFC inductance L 1, L2, L3, three bidirectional switch pipe S1, S2, S3, two PFC bus capacitor C1, C2 and six rectifier diode D1～D6, this part circuit has been realized the function of three-phase PFC.Three-phase LLC circuit comprises first brachium pontis, second brachium pontis and the 3rd brachium pontis, first brachium pontis comprises four switching tube Q1～Q4, second brachium pontis comprises four switching tube Q5～Q8, the 3rd brachium pontis comprises four switching tube Q9～Q12, switching tube Q1 on first brachium pontis, the mid point of Q2 and switching tube Q3, the mid point of Q4 is with two diode D7, D10 series connection back links to each other, switching tube Q5 on second brachium pontis, the mid point of Q6 and switching tube Q7, the mid point of Q8 is with two diode D8, D11 series connection back links to each other the switching tube Q9 on the 3rd brachium pontis, the mid point of Q10 and switching tube Q11, the mid point of Q12 is with two diode D9, D12 series connection back links to each other.The mid point of the mid point of diode D7, D10, diode D8, D11 and diode D9, D12 are connected to the mid point of two PFC bus capacitor C1 and C2.
Transformer in the present embodiment is a three-phase transformer, adopts Y shape to connect, but equally also can adopt △ shape to connect.
In the present embodiment, bridge rectifier is adopted in the output synchronous rectification of transformer secondary, but equally also can adopt full-wave rectification.
Because adopt non-bridge PFC circuits to add the topology of LLC circuit, the AC/DC converter of present embodiment can obtain the high efficiency and the high power density of power supply equally.Just realize PFC and DC/DC conversion, circuit working principle that present embodiment is basic and embodiment one are similarly, specify and see also embodiment one.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. AC/DC converter, comprise pfc circuit and the DC/DC converter that is coupling in described pfc circuit output, it is characterized in that, described pfc circuit is the non-rectifying bridge pfc circuit, described DC/DC converter comprises LLC circuit, transformer and circuit of synchronous rectification, the input of the described LLC circuit of output termination of described pfc circuit, the former limit winding of the described transformer of output termination of described LLC circuit, the secondary winding of described transformer connects the input of described circuit of synchronous rectification.
2. AC/DC converter as claimed in claim 1, it is characterized in that, described pfc circuit is single-phase non-bridge PFC circuits, described single-phase non-bridge PFC circuits comprises first inductance, second inductance, the first stream diode that continues, the second stream diode that continues, the one PFC switching tube, the female stream of the 2nd PFC switching tube and direct current electric capacity, one end of one termination alternating current input power supplying of described first inductance, another termination of described first inductance described first continue a stream anode of diode and an end of described the 2nd PFC switching tube, the other end of the described alternating current input power supplying of one termination of described second inductance, described second inductance another termination described second continue a stream anode of diode and an end of a described PFC switching tube, one end of the female stream of the described direct current of another termination of a described PFC switching tube and described the 2nd PFC switching tube electric capacity, another termination described first of the female stream of described direct current electric capacity the continue negative electrode of stream diode of stream diode and described second that continues.
3. AC/DC converter as claimed in claim 1 or 2, it is characterized in that, described LLC circuit is a three-phase LLC circuit, described three-phase LLC circuit comprises a phase brachium pontis, b phase brachium pontis, c phase brachium pontis, first resonant inductance, second resonant inductance, the 3rd resonant inductance, first resonant capacitance, second resonant capacitance, the 3rd resonant capacitance, first magnetizing inductance, second magnetizing inductance and the 3rd magnetizing inductance, the a that described a phase brachium pontis comprises series connection is first switching tube and a second switch pipe mutually mutually, the b that described b phase brachium pontis comprises series connection is first switching tube and b second switch pipe mutually mutually, the c that described c phase brachium pontis comprises series connection is first switching tube and c second switch pipe mutually mutually, the former limit winding of described transformer comprises former limit first winding, former limit second winding and the former limit tertiary winding, the mid point of the described a phase of the one termination brachium pontis of described first resonant inductance, one end of described first resonant capacitance of another termination of described first resonant inductance, one end of the described former limit of another termination of described first resonant capacitance first winding, the mid point of the described b phase of the one termination brachium pontis of described second resonant inductance, one end of described second resonant capacitance of another termination of described second resonant inductance, one end of the described former limit of another termination of described second resonant capacitance second winding, the mid point of the described c phase of the one termination brachium pontis of described the 3rd resonant inductance, one end of described the 3rd resonant capacitance of another termination of described the 3rd resonant inductance, one end of the described former limit of another termination tertiary winding of described the 3rd resonant capacitance, described former limit first winding, the other end interconnection of described former limit second winding and the described former limit tertiary winding.
4. AC/DC converter as claimed in claim 3 is characterized in that, described first magnetizing inductance, second magnetizing inductance and the 3rd magnetizing inductance are to provide or adopt external inductance by the former limit of described transformer winding.
5. AC/DC converter as claimed in claim 1 or 2 is characterized in that, described transformer is one and adopts the transformer that △ shape connects or Y shape connects.
6. AC/DC converter as claimed in claim 1 or 2 is characterized in that described transformer comprises a plurality of discrete transformer, and each described discrete transformer is corresponding to each phase of described LLC circuit.
7. AC/DC converter as claimed in claim 1 or 2 is characterized in that, described circuit of synchronous rectification is a bridge rectifier.
8. described AC/DC converter as claimed in claim 1 or 2 is characterized in that described circuit of synchronous rectification is a full-wave rectifying circuit.
9. AC/DC converter as claimed in claim 1 is characterized in that, described pfc circuit is the three-phase non-bridge PFC circuits.
10. AC/DC converter as claimed in claim 1 or 2 is characterized in that, described LLC circuit is four phase or four above mutually LLC circuit.
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| CN2010101659408A CN102223091A (en) | 2010-04-14 | 2010-04-14 | AC (alternating-current)/DC (direct-current) converter |
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| CN2010101659408A CN102223091A (en) | 2010-04-14 | 2010-04-14 | AC (alternating-current)/DC (direct-current) converter |
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| CN103516194A (en) * | 2012-06-29 | 2014-01-15 | 艾默生网络能源系统北美公司 | Power factor correction (PFC) circuit, switching power supply module and PFC method |
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| CN105743356A (en) * | 2014-12-09 | 2016-07-06 | 比亚迪股份有限公司 | LLC resonance converter |
| CN106411162A (en) * | 2016-09-30 | 2017-02-15 | 深圳市奥耐电气技术有限公司 | Three-phase AC-DC (Alternating current-Direct Current) power supply changeover system |
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| CN105743356B (en) * | 2014-12-09 | 2019-01-11 | 比亚迪股份有限公司 | A kind of LLC resonant converter |
| CN105743356A (en) * | 2014-12-09 | 2016-07-06 | 比亚迪股份有限公司 | LLC resonance converter |
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| CN106411162A (en) * | 2016-09-30 | 2017-02-15 | 深圳市奥耐电气技术有限公司 | Three-phase AC-DC (Alternating current-Direct Current) power supply changeover system |
| CN106505858A (en) * | 2016-10-19 | 2017-03-15 | 南京航空航天大学 | A kind of tetra- phase full-bridge converters of ZVS and its phase-shifting control method |
| CN106505858B (en) * | 2016-10-19 | 2019-02-12 | 南京航空航天大学 | A kind of tetra- phase full-bridge converter of ZVS and its phase-shifting control method |
| CN106655786A (en) * | 2016-11-21 | 2017-05-10 | 山东艾诺仪器有限公司 | Multiphase bridge current-multiplying type PWM isolation type direct-current conversion circuit |
| US10873265B2 (en) | 2018-06-12 | 2020-12-22 | Virginia Tech Intellectual Properties, Inc. | Bidirectional three-phase direct current (DC)/DC converters |
| CN111027269A (en) * | 2019-12-26 | 2020-04-17 | 南京工程学院 | Two-stage DC/DC converter modeling method based on harmonic equivalent circuit |
| CN111027269B (en) * | 2019-12-26 | 2023-09-12 | 南京工程学院 | Two-stage DC/DC converter modeling method based on harmonic equivalent circuit |
| CN114070076A (en) * | 2020-08-04 | 2022-02-18 | 明纬(广州)电子有限公司 | DC voltage conversion device |
| CN114070076B (en) * | 2020-08-04 | 2023-08-08 | 明纬(广州)电子有限公司 | DC voltage conversion device |
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