CN201345619Y - Low voltage stress single-stage AC-DC converter based on LLC serial connection resonance - Google Patents

Low voltage stress single-stage AC-DC converter based on LLC serial connection resonance Download PDF

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Publication number
CN201345619Y
CN201345619Y CNU2009200505299U CN200920050529U CN201345619Y CN 201345619 Y CN201345619 Y CN 201345619Y CN U2009200505299 U CNU2009200505299 U CN U2009200505299U CN 200920050529 U CN200920050529 U CN 200920050529U CN 201345619 Y CN201345619 Y CN 201345619Y
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China
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diode
inductance
stage
switching tube
electric capacity
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张波
肖文勋
张桂东
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South China University of Technology SCUT
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South China University of Technology SCUT
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The utility model provides a low voltage stress single-stage AC-DC converter based on LLC serial connection resonance, which comprises an input rectification filtering circuit comprising an input filtering circuit (E) and a rectification bridge (Q), a voltage rising and falling circuit comprising a inductance (L), a first switch pipe (S1), a third diode (D) and a first capacitance (C), an output rectification filtering circuit comprising a first diode (D01), a second diode (D02) and a third capacitance (C0), and an LLC serial connection resonance inversion circuit comprising a first switch pipe (S1), a second switch pipe (S2), a first capacitance (C), a second capacitance (Cr), a transformer (T), a leakage inductance (Lr) and a excitation inductance (Lm). The utility model can realize input power factor correction and voltage rising and falling function, has wide output voltage adjusting range, uses less switch pipe, has high efficiency and low cost, and can be used as LCD power supply.

Description

Low voltage stress single-stage AC-DC converter based on the LLC series resonance
Technical field
The utility model relates to the single-stage AC-DC converter technical field, is specifically related to the low voltage stress single-stage AC-DC converter based on the LLC series resonance.
Background technology
The LCD power supply extensively adopts the two-stage AC-DC converter based on the LLC series resonance at present, as shown in Figure 1.In this scheme, converter is divided into two independently power delivery levels.The first order is a power factor correction stage, makes input current follow input voltage waveform by specific control strategy, makes the input current sineization to improve power factor, reduces harmonic content.Control circuit also feeds back output voltage simultaneously, and output voltage is carried out initial adjustment.The second level is based on the DC-DC conversion stage of LLC series resonance, and fine tuning is carried out to first order output voltage in the second level, and all switching tubes are all realized soft switch.Two-stage AC-DC converter can obtain good electric property, as High Power Factor, good voltage-regulation performance etc.But the parts number of circuit is many, has increased cost and circuit complexity.
For reducing the cost of two-stage AC-DC converter, multiple single-stage AC-DC converter has been proposed in recent years.Single-stage AC-DC converter is combined into one-level with power factor correction stage and DC-DC conversion stage, common switch pipe, the single-stage AC-DC converter based on the LLC series resonance as shown in Figure 2.Single-stage type AC-DC converter need not increase device for power switching number and control circuit and just can realize the output voltage quick adjustment when realizing power factor correction, has reduced switching device, has simplified the complexity of circuit.General single-stage AC-DC converter just can be realized power factor correction and output voltage regulatory function simultaneously by regulating a switching variable, but switching tube will bear than higher voltage stress, is not suitable for the LCD power supply of wide input ac voltage scope.
The utility model content
The purpose of this utility model is to overcome the prior art above shortcomings, and a kind of low voltage stress single-stage AC-DC converter based on the LLC series resonance is provided, its by the buck conversion stage and based on the DC-DC conversion stage of LLC series resonance in conjunction with and get.The utility model is achieved through the following technical solutions:
Based on the low voltage stress single-stage AC-DC converter of LLC series resonance, it comprises input filter circuit E, rectifier bridge Q, inductance L, first capacitor C, second capacitor C r, the 3rd capacitor C O, the first switching tube S 1, second switch pipe S 2, the first diode D O1, the second diode D O2With the 3rd diode D; Input filter circuit E and rectifier bridge Q constitute the input rectifying filter circuit; Inductance L, the first switching tube S 1, the 3rd diode D and first capacitor C constitute step-up/step-down circuit; The first diode D O1, the second diode D O2With the 3rd capacitor C OConstitute output rectifier and filter; One end of inductance L is connected with the common cathode of the negative electrode of the 3rd diode D, rectifier bridge Q; One end of the other end of inductance L and capacitor C, the first switching tube S 1Drain electrode connect; The other end of first capacitor C is connected with the anode of the 3rd diode D, again with second switch pipe S 2Source electrode connect; The first switching tube S 1Source electrode be connected with the common anode of rectifier bridge Q, and then with second switch pipe S 2Drain electrode connect.
Above-mentioned low voltage stress single-stage AC-DC converter based on the LLC series resonance, the described first switching tube S 1With second switch pipe S 2All be integrated with body diode and body capacitance; Transformer T is integrated with leakage inductance L rWith magnetizing inductance L m
Above-mentioned low voltage stress single-stage AC-DC converter based on the LLC series resonance, the described first switching tube S 1, second switch pipe S 2, first capacitor C, second capacitor C r, transformer T and leakage inductance L rWith magnetizing inductance L mConstitute LLC series-resonant inverting circuit; The shared first switching tube S of step-up/step-down circuit and LLC series-resonant inverting circuit 1
Above-mentioned low voltage stress single-stage AC-DC converter based on the LLC series resonance, the first switching tube S 1Drain electrode, an end of inductance L be connected with an end of first capacitor C; The first switching tube S 1Source electrode, second switch pipe S 2The drain electrode and second capacitor C rAn end connect, and then be connected with the common anode of rectifier bridge Q; Second switch pipe S 2Source electrode, the other end and the leakage inductance L of first capacitor C rAn end connect, and then be connected with the anode of the 3rd diode D; Second capacitor C rThe other end be connected with the end of the same name of transformer T.
This circuit is by the control first switching tube S 1Thereby duty ratio make the discontinuous work of the electric current of inductance L realize the function that automatic power factor is proofreaied and correct, thereby the terminal voltage that realizes first capacitor C is simultaneously boosted or the voltage stress of step-down limit switch pipe at range of safety operation.This circuit is by the control first switching tube S 1With second switch pipe S 2Switching frequency regulate output voltage.This circuit adopts the LLC resonant technology to realize the soft switch of all power devices.The utility model is realized the input power factor correction, improves the adjustable range and the input ac voltage scope of application of output voltage, can reduce the voltage stress of switching tube, realizes the soft switch of all power devices, improves conversion efficiency.
Compared with prior art the utlity model has following advantage and effect: the low voltage stress single-stage AC-DC converter based on the LLC series resonance of the present utility model is realized the function that automatic power factor is proofreaied and correct with the electric current discontinuous conduction mode of inductance L.With inductance L, the first switching tube S 1, the 3rd diode D and first capacitor C constitute step-up/step-down circuit, when this circuit working during in decompression mode the terminal voltage of first capacitor C be lower than input voltage V InAmplitude, thereby can reduce by first capacitor C, the first switching tube S 1With second switch pipe S 2Voltage stress.The first switching tube S 1With second switch pipe S 2, first capacitor C and second capacitor C r, transformer T and the integrated leakage inductance L of T rWith magnetizing inductance L mConstitute LLC series-resonant inverting circuit, realize the soft switch of all switching tubes.Step-up/step-down circuit and LLC series-resonant inverting circuit common switch pipe S 1The utility model is realized the input power factor correction, and realizes boosting and buck functionality, has the wide output voltage adjustable range, uses less switching tubes, the efficient height, and cost is low, can be used as the LCD power supply.
Description of drawings
Fig. 1 is existing two-stage AC-DC converter based on the LLC series resonance;
Fig. 2 is existing single-stage AC-DC converter based on the LLC series resonance;
Fig. 3 is the low voltage stress single-stage AC-DC converter instance graph based on the LLC series resonance of the present utility model;
Fig. 4 a～Fig. 4 i is the process chart of an interior different phase of switch periods in the execution mode;
Fig. 5 is the work wave of the utility model in a switch periods;
Fig. 6 is the main waveform of the utility model under the power frequency pattern;
Embodiment
Below in conjunction with accompanying drawing execution mode of the present utility model is further described.
Low voltage stress single-stage AC-DC converter based on the LLC series resonance comprises:
Input filter circuit E, rectifier bridge Q, inductance L, capacitor C and C O, two switching tube S 1And S 2, diode D, D O1And D O2, D 1And C 1Be respectively switching tube S 1Integrated body diode and body capacitance, D 2And C 2Be respectively switching tube S 2Integrated body diode and body capacitance, L rAnd L mBe respectively integrated leakage inductance of transformer T and magnetizing inductance;
Input filter circuit E and rectifier bridge Q constitute the input rectifying filter circuit;
Inductance L, switching tube S 1, diode D and capacitor C constitute step-up/step-down circuit;
Switching tube S 1And S 2, capacitor C and C r, transformer T and the integrated leakage inductance L of T rWith magnetizing inductance L mConstitute LLC series-resonant inverting circuit;
Diode D O1, D O2And capacitor C OConstitute output rectifier and filter.
With reference to figure 3, input ac power is powered to the AB end by filter circuit E and rectifier bridge Q, and the AB terminal voltage is a half-sinusoid.Inductance L, switching tube S 1, diode D and capacitor C constitute step-up/step-down circuit.Switching tube S 1And S 2, capacitor C and C r, transformer T and the integrated leakage inductance L of T rWith magnetizing inductance L mConstitute LLC series-resonant inverting circuit.Diode D O1, D O2And capacitor C OConstitute output rectifier and filter.Step-up/step-down circuit and LLC series-resonant inverting circuit common switch pipe S 1One end of inductance L is connected (A end) with the common cathode of the negative electrode of diode D, rectifier bridge Q.One end of the other end of inductance L and capacitor C, switching tube S 1Drain electrode connect.The anode of the other end of capacitor C, diode D, switching tube S 2Source electrode and leakage inductance L rAn end connect.Switching tube S 1Source electrode, S 2Drain electrode, capacitor C rAn end be connected with the common anode (B end) of rectifier bridge Q.Capacitor C rThe other end be connected with the end of the same name of transformer T.The secondary side winding N of transformer T 1Different name end and N 2End of the same name connects, and is connected with negative pole of output end then.N 1End of the same name and diode D O1Anode connect.N 2Different name end and diode D O2Anode connect.D O1Negative electrode and D O2Negative electrode connect, be connected with output head anode then.D 1And C 1Be respectively switching tube S 1Integrated body diode and body capacitance, D 2And C 2Be respectively switching tube S 2Integrated body diode and body capacitance, L rAnd L mBe respectively integrated leakage inductance of transformer T and magnetizing inductance.
Fig. 4 a～Fig. 4 i has provided circuit working process of the present utility model, and Fig. 5 has provided the work wave of the utility model in a switch periods, and Fig. 6 provides the main waveform of the utility model under the power frequency pattern.
(1) the circuit working process in a switch periods, respectively corresponding following each stage of Fig. 4 a～Fig. 4 i:
Stage 1 (t 0～t 1): and t 0Moment switching tube S 1And S 2Turn-off inductance L mCurrent i LmWith resonance current i LrEquate transformer primary side current i pBe zero, output is exported rectifier diode D by transformer isolation O1And D O2Instead end output capacitance C partially ODischarge and powering load.Resonance current i LrTo S 2Body capacitance C 2Charging is S simultaneously 1Body capacitance C 1Discharge.Work as C 1When discharge finishes, S 1On body diode D 1Conducting, stage 1 operating state finishes.
Stages 2 (t 1～t 2): t 1Constantly, S 2Turn-off body diode D 1Conducting is S 1The ZVS conducting create conditions.This moment i p=i Lr-i Lm, inductance L mBack electromotive force V LmRise gradually.t 2' moment V Lm=nV O, export rectifier diode D this moment O1Conducting, transformer primary side voltage is clamped at nV O, L mIn this voltage lower linear charging, do not participate in resonance.As resonance current i LrRise at 0 o'clock, stages 2 operating state finishes.
Stages 3 (t 2～t 3): S 1Added gate electrode drive signals 2 o'clock stages, at t 2Constantly, resonance current i LrBy negative timing, the S of becoming 1Forward conduction, inductance L is at input voltage V ABThe lower linear charging, output rectifier diode D O1Conducting, transformer primary side voltage is clamped at nV O, L mIn this voltage lower linear charging, do not participate in resonance, energy is delivered to V by capacitor C OWork as i LmEqual resonance current i LrThe time, the stage 3 finishes.
Stages 4 (t 3～t 4): t 3Constantly, i LmEqual resonance current i Lr, L mParticipate in resonance, output rectifier diode D O1Instead end output capacitance C partially ODischarge and powering load.Inductance L continues at input voltage V ABThe lower linear charging.
Stages 5 (t 4～t 5): t 4Constantly, S 1And S 2Turn-off output rectifier diode D O1And D O2Instead end output capacitance C partially ODischarge and powering load, resonance current i LrTo body capacitance C 1Charging is body capacitance C simultaneously 2Discharge.Inductance L is at voltage (V AB-V C1) charging down.Work as C 2When discharge finishes, S 2On body diode D 2Conducting, stages 5 operating state finishes.
Stages 6 (t 5～t 6): t 5Constantly, body diode D 2Conducting is S 2The ZVS conducting create conditions.Inductance L is at voltage V CFollowing discharge is also charged to capacitor C.This moment i p=i Lr-i Lm, inductance L mBack electromotive force V LmRise gradually.t 6' moment V Lm=-nV O, export rectifier diode D this moment O2Conducting, transformer primary side voltage is clamped at-nV O, L mThe reverse linear charging does not participate in resonance under this voltage.As resonance current i LrDrop at 0 o'clock, stages 6 operating state finishes.
Stages 7 (t 6～t 7): S 2Added gate electrode drive signals 6 o'clock stages, at t 6Constantly, resonance current i LrWhen just becoming negative, S 2Forward conduction, output rectifier diode D O2Conducting, transformer primary side voltage is clamped at-nV O, L mReverse linear charging under this voltage does not participate in resonance, the resonance current L that flows through mWith the transformer primary side, deliver power to V OInductance L is at voltage V CFollowing continuation discharge is also given storage capacitor C dCharging is as inductive current i LWhen dropping to zero, D instead ends partially, and the stage 7 finishes.
Stages 8 (t 7～t 8): t 7Constantly, inductive current i LWhen dropping to zero, D instead ends partially, and resonance current continues the L that flows through mWith the transformer primary side, deliver power to V OWork as i LmEqual resonance current i LrThe time, the stage 8 finishes.
Stages 9 (t 8～t 9): t 8Constantly, i LmEqual resonance current i Lr, L mParticipate in resonance, output rectifier diode D O2Instead end output capacitance C partially ODischarge and powering load.
(2) operation principle of buck conversion stage
t 2～t 4The stage inductance is at input voltage V ABThe lower linear charging, the increment of electric current is:
Δ i L 1 = V AB L ( t 4 - t 2 ) = V AB L D ON T - - - ( 1 )
D wherein ONBe switching tube S 1The conducting duty ratio, T is a switch periods.
t 4～t 5The stage inductance is at input voltage (V AB-V C1) the lower linear charging, the increment of electric current is:
Δ i L 2 = ∫ t 4 t 5 V AB - V C 1 L dt - - - ( 2 )
t 5～t 6The stage inductance is at input voltage V CThe lower linear discharge, the increment of electric current is:
Δ i L 3 = - V C L ( t 6 - t 5 ) = - V C L T OFF - - - ( 3 )
D wherein OFFIt is the duty ratio of inductance L discharge.
When circuit working in inductive current i LDuring discontinuous mode, Δ i is arranged L1+ Δ i L2=| Δ i L3|.Because t 4～t 5Time in stage is very short, this stage current i LIncrement can ignore, can get thus
V C V AB = D ON D OFF - - - ( 4 )
V ABAmplitude equal power supply V InAmplitude, therefore
V C V in = D ON D OFF - - - ( 5 )
Work as D as can be known by formula (5) ON＞D OFFThe time, V C＞V InWork as D ON＜D OFFThe time, V C＜V InCan carry out initial adjustment to the terminal voltage of capacitor C by the control duty ratio, and reduce duty ratio D ONEffectively the terminal voltage of control capacitance C is lower than the input voltage amplitude, thereby has reduced switching tube S 1And S 2Voltage stress.
(3) input power factor correction principle
Because inductive current i LIntermittently, at MOSFET pipe S 1Each conducting phase i LCurrent peak and this conducting phase input voltage V CAB(V CAB=| V In|) mean value proportional, again because the average voltage of each conducting phase is a sinusoidal variations, so the peak value of input current also is a sinusoidal variations.And the inductive current pulse always starts from scratch, so their mean value also is sinusoidal variations, as shown in Figure 6.All alternating current pulses have been formed waveform and have been comprised 50 or first-harmonic and the switching frequency component of 60Hz frequency, through L In, C InFilter circuit E gets Sinusoidal Input Currents i Lin

Claims (4)

1,, it is characterized in that comprising input filter circuit (E), rectifier bridge (Q), inductance (L), first electric capacity (C), the second electric capacity (C based on the low voltage stress single-stage AC-DC converter of LLC series resonance r), the 3rd electric capacity (C O), the first switching tube (S 1), second switch pipe (S 2), the first diode (D O1), the second diode (D O2) and the 3rd diode (D); Input filter circuit (E) constitutes the input rectifying filter circuit with rectifier bridge (Q); Inductance (L), the first switching tube (S 1), the 3rd diode (D) and first electric capacity (C) constitutes step-up/step-down circuit; First diode (the D O1), the second diode (D O2) and the 3rd electric capacity (C O) the formation output rectifier and filter; One end of inductance (L) is connected with the common cathode of the negative electrode of the 3rd diode (D), rectifier bridge (Q); One end of the other end of inductance (L) and electric capacity (C), the first switching tube (S 1) drain electrode connect; The other end of first electric capacity (C) is connected with the anode of the 3rd diode (D), again with second switch pipe (S 2) source electrode connect; First switching tube (the S 1) source electrode be connected with the common anode of rectifier bridge (Q), and then with second switch pipe (S 2) drain electrode connect.
2, the low voltage stress single-stage AC-DC converter based on the LLC series resonance according to claim 1 is characterized in that, the described first switching tube (S 1) and second switch pipe (S 2) all be integrated with body diode and body capacitance; Transformer (T) is integrated with leakage inductance (L r) and magnetizing inductance (L m).
3, the low voltage stress single-stage AC-DC converter based on the LLC series resonance according to claim 2 is characterized in that, the first switching tube (S 1), second switch pipe (S 2), first electric capacity (C), the second electric capacity (C r), transformer (T) and leakage inductance (L r) and magnetizing inductance (L m) formation LLC series-resonant inverting circuit; The shared first switching tube (S of step-up/step-down circuit and LLC series-resonant inverting circuit 1).
4, the low voltage stress single-stage AC-DC converter based on the LLC series resonance according to claim 3 is characterized in that, the first switching tube (S 1) drain electrode, an end of inductance (L) be connected with an end of first electric capacity (C); First switching tube (the S 1) source electrode, second switch pipe (S 2) the drain electrode and the second electric capacity (C r) an end connect, and then be connected with the common anode of rectifier bridge (Q); Second switch pipe (S 2) source electrode, the other end and the leakage inductance (L of first electric capacity (C) r) an end connect, and then be connected with the anode of the 3rd diode (D); Second electric capacity (the C r) the other end be connected with the end of the same name of transformer (T).
CNU2009200505299U 2009-01-20 2009-01-20 Low voltage stress single-stage AC-DC converter based on LLC serial connection resonance Expired - Lifetime CN201345619Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI463771B (en) * 2010-08-27 2014-12-01 Univ Nat Cheng Kung Llc resonant converting system with continuous-current-mode power-factor-correction
CN104917412A (en) * 2015-07-17 2015-09-16 东南大学 Single stage power factor correction phase-shift full bridge topology circuit
CN106463995A (en) * 2014-03-17 2017-02-22 梅塔系统股份公司 Power supply stage of an electric appliance, in particular a battery charger for charging batteries of electric vehicles
CN106887945A (en) * 2017-04-10 2017-06-23 东莞理工学院 Single-stage resonant mode isolates Sofe Switch boosting power factor correction circuit and bearing calibration
CN106887947A (en) * 2017-04-12 2017-06-23 华中科技大学 A kind of Bridgeless power factor correction converter of high efficiency half
CN109546851A (en) * 2018-10-23 2019-03-29 杭州电子科技大学 Sofe Switch High Power Factor alternating continuous-current commutating machine
CN110391760A (en) * 2019-07-15 2019-10-29 四川大学 A kind of High Power Factor mixed structure multi-output switching converter
CN110707931A (en) * 2019-09-06 2020-01-17 广州金升阳科技有限公司 LLC resonant converter and control method
TWI768888B (en) * 2020-06-10 2022-06-21 美商蘋果公司 Two-stage power converter and method of operating a two-stage converter

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI463771B (en) * 2010-08-27 2014-12-01 Univ Nat Cheng Kung Llc resonant converting system with continuous-current-mode power-factor-correction
CN106463995A (en) * 2014-03-17 2017-02-22 梅塔系统股份公司 Power supply stage of an electric appliance, in particular a battery charger for charging batteries of electric vehicles
CN106463995B (en) * 2014-03-17 2019-12-06 梅塔系统股份公司 Power supply for an electrical appliance, in particular a battery charger for charging the batteries of an electric vehicle
CN104917412A (en) * 2015-07-17 2015-09-16 东南大学 Single stage power factor correction phase-shift full bridge topology circuit
CN106887945A (en) * 2017-04-10 2017-06-23 东莞理工学院 Single-stage resonant mode isolates Sofe Switch boosting power factor correction circuit and bearing calibration
CN106887947B (en) * 2017-04-12 2023-07-04 华中科技大学 High-efficiency semi-bridgeless power factor correction converter
CN106887947A (en) * 2017-04-12 2017-06-23 华中科技大学 A kind of Bridgeless power factor correction converter of high efficiency half
CN109546851A (en) * 2018-10-23 2019-03-29 杭州电子科技大学 Sofe Switch High Power Factor alternating continuous-current commutating machine
CN110391760A (en) * 2019-07-15 2019-10-29 四川大学 A kind of High Power Factor mixed structure multi-output switching converter
CN110707931A (en) * 2019-09-06 2020-01-17 广州金升阳科技有限公司 LLC resonant converter and control method
TWI768888B (en) * 2020-06-10 2022-06-21 美商蘋果公司 Two-stage power converter and method of operating a two-stage converter
US11424684B2 (en) 2020-06-10 2022-08-23 Apple Inc. High performance two stage power converter with enhanced light load management
US11695344B2 (en) 2020-06-10 2023-07-04 Apple Inc. High performance two stage power converter with enhanced light load management

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