CN106550512B - A kind of resonant type soft-switch single stage type LED drive circuit - Google Patents

A kind of resonant type soft-switch single stage type LED drive circuit Download PDF

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Publication number
CN106550512B
CN106550512B CN201710025085.2A CN201710025085A CN106550512B CN 106550512 B CN106550512 B CN 106550512B CN 201710025085 A CN201710025085 A CN 201710025085A CN 106550512 B CN106550512 B CN 106550512B
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China
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capacitance
diode
switching tube
inductance
circuit
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Expired - Fee Related
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CN201710025085.2A
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CN106550512A (en
Inventor
章治国
刘俊良
郭强
李山
陈艳
刘述喜
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Chongqing University of Technology
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Chongqing University of Technology
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of resonant type soft-switch single stage type LED drive circuits, and including AC input, rectification circuit, pfc circuit, DC/DC circuits, LED load and control circuit, the pfc circuit includes inductance LB, diode D1, diode D2, capacitance CBWith switching tube S1；The DC/DC circuits include inductance Lr, capacitance Cr, capacitance Cs, capacitance Co, switching tube S2, transformer T, diode Do1With diode Do2, diode Do2Cathode simultaneously with capacitance CoIt is connected with one end of LED load；The other end of the secondary windings of transformer T simultaneously with diode Do1Anode, capacitance CoAnd one end equipotential of LED load is connected；The switching tube S1With switching tube S2Grid simultaneously be connected with the driving signal output end of control circuit.Circuit structure of the present invention is simple, and can improve efficiency, improves power factor.

Description

A kind of resonant type soft-switch single stage type LED drive circuit
Technical field
The present invention relates to field of circuit technology more particularly to a kind of resonant type soft-switch single stage type LED drive circuits.
Background technology
LED is a kind of irradiative semiconductor devices, belongs to a kind of completely new illuminating source.It has energy conservation and environmental protection, height Many advantages, such as light efficiency, long-life, various color, gradually replaces traditional lighting lamps and lanterns, becomes the illuminations of a new generation.China Quality certification center（English abbreviation CQC）It was researched and developed in 2014 and is proposed that LED module alternating electron control device is energy saving to be recognized Card business, it is CQC3146-2014 that LED module alternating electron control device, which needs the standard of foundation,《LED module alternating electron The energy saving authentication techniques specification of control device》.The code requirement, when isolated LED drive power power is less than 5W, efficiency needs More than 78.5%, reactive factor requirement；When the power of LED drive power is between 5W and 25W, efficiency need to be more than 84%, power Factor need to be more than 0.8.It is bigger with the power of LED drive power, to its efficiency and power factor command higher.
In existing middle low power LED drive circuit frequently with two-stage type or single stage type.Two-stage type：Prime（PFC grades）It is real Existing PFC, rear class（DC/DC grades）It realizes pressure-stabilizing constant flow output, needs two sets of processing elements and corresponding control circuit, Its circuit is complicated, of high cost, efficiency is low.Then single stage type circuit becomes the hot spot of research：It is integrated by PFC grades and DC/DC grades Together, common switch pipe and control circuit, component is few, at low cost, efficiency and power density are obtained for promotion.It is but big absolutely Most single stage type LED drive circuits limit the promotion of circuit efficiency all in hard switching state.And due in actual circuit There are leakage inductances for transformer, understand the parasitic capacitance resonance in circuit, often can increase other absorbing circuits again to inhibit resonance, This can sacrifice single stage type LED drive circuit performance.Thus, design and develop out a kind of high efficiency, High Power Factor, circuit structure letter Single ully-soft switchingr single stage type LED drive circuit is of great significance.
Invention content
For deficiencies of the prior art, the purpose of the present invention is to provide a kind of resonant type soft-switch single stage types LED drive circuit, circuit structure is simple, and can improve efficiency, improves power factor.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is such：A kind of resonant type soft-switch single-stage Formula LED drive circuit, including AC input, rectification circuit, pfc circuit, DC/DC circuits, LED load and control circuit, It is characterized in that：
The rectification circuit, for AC input alternating current to be converted into direct current；
The pfc circuit includes inductance LB, diode D1, diode D2, capacitance CBWith switching tube S1, wherein：The inductance LBOne end be connected with an output terminal of rectification circuit, inductance LBThe other end simultaneously with diode D1With diode D2Anode It is connected；Diode D1Cathode and switching tube S1Source electrode be connected, diode D2Cathode and capacitance CBOne end be connected；Capacitance CB The other end, switching tube S1Drain electrode and another output terminal of rectification circuit be grounded simultaneously；
The DC/DC circuits include inductance Lr, capacitance Cr, capacitance Cs, capacitance Co, switching tube S2, transformer T, diode Do1 With diode Do2, wherein：The capacitance CrWith inductance LrOne end simultaneously with diode D2Cathode is connected, inductance LrThe other end It is connected with one end of the armature winding of transformer T, the other end of the armature winding of transformer T and switching tube S2Drain electrode simultaneously with Switching tube S1Source electrode be connected；Capacitance CrOther end end and switching tube S2Source electrode be connected；The one of the secondary windings of transformer T End and capacitance CsOne end be connected, capacitance CsThe other end simultaneously with diode Do1Cathode and diode Do2Anode be connected, Diode Do2Cathode simultaneously with capacitance CoIt is connected with one end of LED load；The other end of the secondary windings of transformer T simultaneously with Diode Do1Anode, capacitance CoAnd one end equipotential of LED load is connected；
The switching tube S1With switching tube S2Grid simultaneously be connected with the driving signal output end of control circuit.
Further, the switching tube S of control circuit output1With switching tube S2Drive signal, for complementary pulsewidth driving letter Number, for controlling switching tube S respectively1With switching tube S2Turn-on and turn-off.
Further, the LED light row that the LED load is connected to form for several LED light.
Further, the inductance LrFor resonant inductance, the capacitance CsFor resonant capacitance.
Compared with prior art, the invention has the advantages that：Simple in structure, component is less, efficient；In single stage type On LED drive circuit, resonant type soft-switch technology is combined, resonance is participated in using the magnetizing inductance of transformer, realizes Sofe Switch, subtract Few tradition hard switching causes EMI to interfere, can high-frequency work, and higher power factor can be obtained simultaneously；Simultaneously can compared with Under high alternating voltage input, intermediate dc capacitance voltage is kept in the range of it can bear.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of the present invention.
Fig. 2 is inductance LBThe average current input waveform in half of power frequency period.
Fig. 3 is the equivalent schematic diagram of DC/DC circuits.
Fig. 4 is the circuit simulation oscillogram of the present invention.
Specific embodiment
Below in conjunction with accompanying drawings and embodiments, the invention will be further described.
Embodiment：Referring to Fig. 1, a kind of resonant type soft-switch single stage type LED drive circuit, including AC input, rectification circuit, Pfc circuit, DC/DC circuits, LED load and control circuit.The LED load is the LED light that several LED light are connected to form Row.
The rectification circuit, for AC input alternating current to be converted into direct current；When it is implemented, it includes DR1、 DR2、DR3And DR4, AC input（Vac）One end simultaneously and DR1Anode and DR3Cathode be connected, the other end of AC input While and DR2Anode and DR4Cathode be connected, DR1And DR2Anode be connected after an output terminal as rectification circuit, DR3With DR4Cathode be connected after another output terminal as rectification circuit.
The pfc circuit includes inductance LB, diode D1, diode D2, capacitance CBWith switching tube S1.Wherein：The inductance LBOne end be connected with an output terminal of rectification circuit, inductance LBThe other end simultaneously with diode D1With diode D2Anode It is connected.Diode D1Cathode and switching tube S1Source electrode be connected, diode D2Cathode and capacitance CBOne end be connected.Capacitance CB The other end, switching tube S1Drain electrode and another output terminal of rectification circuit be grounded simultaneously；Power factor school is realized with this Orthofunction.
The DC/DC circuits include inductance Lr, capacitance Cr, capacitance Cs, capacitance Co, switching tube S2, transformer T, diode Do1 With diode Do2.Wherein：The capacitance CrWith inductance LrOne end simultaneously with diode D2Cathode is connected, inductance LrThe other end It is connected with one end of the armature winding of transformer T, the other end of the armature winding of transformer T and switching tube S2Drain electrode simultaneously with Switching tube S1Source electrode be connected；During actual implementation, the inductance LrFor resonant inductance, the capacitance CsFor resonant capacitance；It should Inductance LrIt can be replaced according to the working condition of circuit as the leakage inductance present in transformer T.Capacitance CrOther end end and switching tube S2Source electrode be connected；One end of the secondary windings of transformer T and capacitance CsOne end be connected, capacitance CsThe other end simultaneously with two Pole pipe Do1Cathode and diode Do2Anode be connected, diode Do2Cathode simultaneously with capacitance CoWith one end phase of LED load Even；The other end of the secondary windings of transformer T simultaneously with diode Do1Anode, capacitance CoAnd one end equipotential of LED load It is connected（It is normally grounded）；Adjusting to output voltage, electric current is realized with this.
The switching tube S1With switching tube S2Grid simultaneously be connected with the driving signal output end of control circuit；Wherein, it controls The switching tube S of circuit output processed1With switching tube S2Drive signal, for complementary pulsewidth drive signal, for controlling switch respectively Pipe S1With switching tube S2Turn-on and turn-off.
By inductance LB, diode D1, diode D2, capacitance CBWith switching tube S1The pfc circuit of composition, by determining inductance LB Value and control circuit to switching tube S1The duty ratio of the drive signal of grid input can make the Boost topology works of PFC units Make in DCM patterns, Boost topologys can realize PFC functions automatically in this mode.As shown in Fig. 2, on representation switch pipe is connected, Off representation switch pipe disconnects；ILB, avg are inductance LBIn half of power frequency period average current input waveform, Q1For switching tube S1 Gate drive waveform.
As shown in figure 3, in DC/DC circuits, it can be capacitance CBRegard direct voltage source V asg, as open pipe S2It is off State, switching tube S1During beginning to turn on（t0~t1）, switching tube S1Parasitic capacitance（Coss）With inductance LrWith the excitation of transformer T Inductance LmStart resonance, as switching tube S1Parasitic capacitor voltage（Vcoos）Drop to zero from current value, at this moment（t1）Conducting Switching tube S1It can realize ZVS（Zero voltage switch）.
In switching tube S1It begins to turn on and diode Do1During shutdown（t1~t2）, DC voltage VgIt is added in static exciter electricity Feel LmWith inductance LrOn, while transformer secondary side only has diode Do1Start forward bias, at this time static exciter inductance Lm、 Inductance LrWith capacitance CsStart resonance, as capacitance CsWhen voltage is increased to maximum value, pass through diode Do1Electric current be zero, then, Diode Do1Realize ZCS（Zero Current Switch）.
In switching tube S1Shutdown, switching tube S2Period before conducting（t3~t4）, flow through the electric current switch tube S of inductance Lr1Post Raw capacitance CossCharging, when voltage is increased to DC voltage VgWith capacitance CrVoltage and when, at this moment（t4）Switching tube is connected S2, can realize ZVS（Zero voltage switch）.
In switching tube S2It begins to turn on and diode Do2During disconnection（t4~t5）, it can be understood as capacitance CrOn voltage Vr It is added in static exciter inductance LmWith inductance LrOn, while transformer secondary side only has diode Do2Start forward bias, at this time Static exciter inductance LmWith inductance LrWith capacitance CsStart resonance, as capacitance CsWhen voltage drops to minimum value, pass through diode Do1Electric current be zero, then, diode Do2Realize ZCS（Zero Current Switch）.
As shown in figure 4, VcossAnd VS2Respectively switching tube S1With switching tube S2Drain-source between voltage waveform, Q1And Q2Respectively For switching tube S1With switching tube S2Gate drive waveform, IDo1And IDo2Respectively diode Do1With diode Do2Current wave Shape.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than restriction technologies side Case, it will be understood by those of ordinary skill in the art that, those are modified or replaced equivalently technical scheme of the present invention, and The objective and range of the technical program are not departed from, is intended to be within the scope of the claims of the invention.

Claims (2)

1. a kind of resonant type soft-switch single stage type LED drive circuit, including AC input, rectification circuit, pfc circuit, DC/DC electricity Road, LED load and control circuit, it is characterised in that：
The rectification circuit, for AC input alternating current to be converted into direct current；
The pfc circuit includes inductance LB, diode D1, diode D2, capacitance CBWith switching tube S1, wherein：The inductance LB's One end is connected with an output terminal of rectification circuit, inductance LBThe other end simultaneously with diode D1With diode D2Anode be connected； Diode D1Cathode and switching tube S1Source electrode be connected, diode D2Cathode and capacitance CBOne end be connected；Capacitance CBIt is another One end, switching tube S1Drain electrode and another output terminal of rectification circuit be grounded simultaneously；
The DC/DC circuits include inductance Lr, capacitance Cr, capacitance Cs, capacitance Co, switching tube S2, transformer T, diode Do1With two Pole pipe Do2, the inductance LrFor resonant inductance, the capacitance CsFor resonant capacitance；Wherein：The capacitance CrWith inductance LrOne end Simultaneously with diode D2Cathode is connected, inductance LrThe other end be connected with one end of the armature winding of transformer T, transformer T just The grade other end of winding and switching tube S2Drain electrode simultaneously with switching tube S1Source electrode be connected；Capacitance CrOther end end with switch Pipe S2Source electrode be connected；One end of the secondary windings of transformer T and capacitance CsOne end be connected, capacitance CsThe other end simultaneously with Diode Do1Cathode and diode Do2Anode be connected, diode Do2Cathode simultaneously with capacitance CoWith one end of LED load It is connected；The other end of the secondary windings of transformer T simultaneously with diode Do1Anode, capacitance CoAnd the electricity such as one end of LED load Position is connected；
The switching tube S1With switching tube S2Grid simultaneously be connected with the driving signal output end of control circuit；Control circuit is defeated The switching tube S gone out1With switching tube S2Drive signal, for complementary pulsewidth drive signal, for controlling switching tube S respectively1With open Close pipe S2Turn-on and turn-off.
2. a kind of resonant type soft-switch single stage type LED drive circuit according to claim 1, it is characterised in that：The LED is born Carry the LED light row being connected to form for several LED light.
CN201710025085.2A 2017-01-13 2017-01-13 A kind of resonant type soft-switch single stage type LED drive circuit Expired - Fee Related CN106550512B (en)

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CN106851925B (en) * 2017-04-01 2018-11-02 哈尔滨工业大学 High efficiency single-stage LED drive device based on Flyback and Class-E
CN107659158B (en) * 2017-10-30 2020-03-13 重庆理工大学 Isolated high-gain direct current converter of multi-resonant network unit
CN108684104B (en) * 2018-05-23 2020-07-31 哈尔滨工业大学 L ED automobile headlamp driver based on improved SEPIC soft switch
TWI692189B (en) 2019-01-31 2020-04-21 宏碁股份有限公司 Power conversion device
CN111614243B (en) * 2019-02-25 2021-10-22 宏碁股份有限公司 Power supply conversion device
CN110492737B (en) * 2019-07-26 2021-05-25 江苏大学 Single-stage isolation type electrolytic capacitor-free LED driving power supply and switching method
CN111740622B (en) * 2020-07-07 2020-11-13 奇普电源(常州)有限公司 LLC circuit of single-stage PFC

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