CN107155232B - A kind of High Power Factor LED constant current driving power and its control method - Google Patents

A kind of High Power Factor LED constant current driving power and its control method Download PDF

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CN107155232B
CN107155232B CN201710044958.4A CN201710044958A CN107155232B CN 107155232 B CN107155232 B CN 107155232B CN 201710044958 A CN201710044958 A CN 201710044958A CN 107155232 B CN107155232 B CN 107155232B
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voltage
pfc
control
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CN107155232A (en
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林国庆
李俊
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Fuzhou University
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Fuzhou University
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light emitting diodes [LEDs]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

It includes pfc circuit, half-bridge resonance constant-current network, LED load and control circuit that the present invention, which provides a kind of High Power Factor LED constant current driving power and its control method, the power supply,;Pfc circuit is flowed into after the rectified filtering of electric network source;Pfc circuit output is connected with the input of half-bridge resonance constant-current network;The output of half-bridge resonance constant-current network connects LED load;Pfc circuit is controlled by control circuit;Control circuit carries out composite feedback by acquisition pfc circuit output voltage and LED load electric current, and by both signals to control the output voltage of PFC, realizes the current constant control to the LED load.Pfc circuit is made of for realizing High Power Factor and pressure stabilizing, half-bridge resonance constant-current network the half-bridge resonance network with constant-current characteristics, and control circuit is by acquisition PFC output voltage and LED load electric current, to realize the current constant control to the LED load.Have many advantages, such as that simple, the high-efficient and constant current accuracy of control is high.

Description

A kind of High Power Factor LED constant current driving power and its control method
Technical field
The present invention relates to LED drive power field, more particularly to a kind of High Power Factor LED constant current driving power and its Control method.
Background technique
The lighting method of green energy conservation has become a developing direction of society in recent years, and LED is as a kind of a new generation Green illumination light source is the lighting source of the following mainstream, obtains very extensive answer in fields such as tunnel illumination, street lightings With.According to the C-V characteristic of LED, to guarantee its reliable work, LED needs to drive using constant current.
High-power LED driver mostly uses greatly controlled resonant converter, and LLC resonant converter may be implemented due to its main switch ZVS can be effectively reduced switching loss, and application is relatively broad, but when the LED number difference of driving, working frequency variation Range is larger, is not suitable for the LED operation for requiring wide output voltage to change.LCL or CLC resonant network exports electric current and resonance is joined Number is related with input voltage, and when input voltage and constant resonant parameter, resonant network inherently has constant-current characteristics, by opening LED constant current output can be realized in ring control, but in practical applications, and PFC voltage and resonant parameter have dispersibility, this can Constant current accuracy can be caused to reduce, it is difficult to meet constant current accuracy requirement, propose PFC output voltage thus and LED load electric current is multiple The control method for closing feedback, improves constant current accuracy.
Summary of the invention
The object of the present invention is to provide a kind of High Power Factor LED constant current driving power and its control methods.
The invention adopts the following technical scheme: a kind of High Power Factor LED constant current driving power, it is characterised in that: including Pfc circuit, half-bridge resonance constant-current network, LED load and control circuit;Pfc circuit is flowed into after the rectified filtering of electric network source; Pfc circuit output is connected with the input of half-bridge resonance constant-current network;The output of half-bridge resonance constant-current network connects LED load;The PFC electricity Route test circuit control;Control circuit is by acquisition pfc circuit output voltage and LED load electric current, and by both signals Composite feedback is carried out to control the output voltage of PFC, realizes the current constant control to the LED load.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformer.
Further, the pfc circuit uses Boost.
Further, control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage and current Compound circuit and voltage-regulating circuit;LED load electric current is connected through current sampling circuit and matrix current adjustment circuit input;Electric current Adjustment circuit output is connected with the input of voltage and current compound circuit one;Pfc circuit output voltage is through voltage sample circuit and voltage Another input connection of electric current compound circuit;The output of voltage and current compound circuit is connected with voltage-regulating circuit input;Voltage adjustment Circuit output is for controlling PFC circuit output voltage.
The present invention also provides a kind of control methods of High Power Factor LED constant current driving power, it is characterised in that: provides one High Power Factor LED constant current driving power comprising pfc circuit, half-bridge resonance constant-current network, LED load and control circuit;It adopts With the control method of PFC output voltage and LED load electric current composite feedback, pfc circuit output voltage is controlled by composite feedback So that LED load current is kept constant;When output short-circuit and open circuit when, pfc circuit output voltage control Vmin and Vmax it Between, the design of control circuit needs to consider pfc circuit output voltage variation range;The half-bridge circuit of half-bridge resonance constant-current network is adopted It is controlled with constant frequency, working frequency is located near the resonance frequency of half-bridge resonance constant-current network.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformer;It is described Based on CLCL type resonant network half bridge resonant transformer include switching tube S1, switching tube S2, capacitor Cr, capacitor Cs, inductance Lr, Inductance Ls and transformer T1;The drain electrode of the switching tube S1 is connect with resonant network input voltage Uin anode, the source of switching tube S1 Pole is connect with the drain electrode of switching tube S2;The source electrode of switching tube S2 is connect with voltage Uin cathode;The one end capacitor Cr and switching tube S2 Drain electrode connection;The capacitor Cr other end is connect with the one end inductance Lr, the one end capacitor Cs respectively;The inductance Lr other end and switching tube S2 Source electrode connection, the capacitor Cs other end connect with the one end inductance Ls;The inductance Ls other end is connect with transformer T1 primary one end;Become The depressor T1 primary other end is connect with the inductance Lr other end;T1 grade of transformer connects LED load;Assuming that transformer T1 magnetizing inductance Lm is sufficiently large, ignores its influence to load current, then resonant network equivalent load electric current are as follows:Wherein ReqFor LED load conversion Equivalent resistance to after the transformer T1 primary side of CLCL type resonant network half bridge resonant transformer;From formula (1) as can be seen that working asWhen, export current peakWith load resistance ReqIt is unrelated, it is only electric with input Pressure and resonant parameter are related, and resonant network works in constant current mode.
Further, the control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage Electric current compound circuit and voltage-regulating circuit;Matrix current adjustment circuit is by load current feedback signal, current reference and electric current Error amplifier composition, for stablizing output electric current;Voltage and current compound circuit is by the sampled signal of PFC output voltage and load Output signal of the electric current after matrix current adjustment circuit carries out compound, voltage feedback signal of the result as voltage-regulating circuit; Voltage-regulating circuit is made of PFC output voltage feedback signal, voltage reference and voltage error amplifier, for controlling PFC Output voltage.
Further, the pfc circuit uses Boost, and by PFC control chip U1 control, PFC output voltage is taken Sample signal is divided to obtain by resistance R7, R8;Half-bridge resonance constant-current circuit is by switching tube S1, S2, inductance Lr, Ls, capacitor Cr, Cs It is formed with transformer T1, switching tube S1, S2 are controlled by complementary drive signals Vgs1 and Vgs2 that duty ratio is 0.5 respectively, half-bridge Circuit works in the constant current area of resonant network;LED load is driven by two-way flow equalizing circuit, one routing diode D6, capacitor C9 and LED2 composition, another way are made of diode D5, capacitor C0 and LED1, and capacitor C8 is that the equal galvanic electricity of two paths of LED load is held, Rs For the sample resistance of LED1 electric current;Control circuit controls core by in-phase amplifier U4, error amplifier U3, subtracter U2 and PFC Piece U1 composition;LED current sampled signal through in-phase amplifier U4 amplification after compared with reference signal Vref, through error amplifier Subtract each other with PFC output voltage sampled signal the voltage feedback signal as PFC control chip U1 after U3, make PFC output voltage by Voltage sampling signal and LED load electric current complex controll, to realize the current constant control to LED light.
Pfc circuit of the invention is for realizing High Power Factor and pressure stabilizing, and the half-bridge resonance constant-current network is by having The half-bridge resonance network of constant-current characteristics forms, and the control circuit passes through acquisition PFC output voltage and LED load electric current, and Both signals are subjected to composite feedback to control the output voltage of PFC, to realize the constant current control to the LED load System.Have many advantages, such as that simple, the high-efficient and constant current accuracy of control is high.
Detailed description of the invention
Fig. 1 is High Power Factor LED constant current driving power functional block diagram of the present invention.
Fig. 2 is the half bridge resonant transformer based on CLCL type resonant network.
Fig. 3 is the ac equivalent circuit of resonant network.
Output electric current and working frequency relation curve when Fig. 4 is different loads resistance.
Fig. 5 is High Power Factor of embodiment of the present invention LED constant current driving power circuit diagram.
PFC output voltage and load current waveform when Fig. 6 is different resonant parameters.
Specific embodiment
Explanation is further explained to the present invention in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, the present invention provides a kind of High Power Factor LED constant current driving power comprising pfc circuit, half-bridge are humorous Vibration constant-current network, LED load and control circuit;Pfc circuit is flowed into after the rectified filtering of electric network source;Pfc circuit output and half The input connection of bridge resonance constant-current network;The output of half-bridge resonance constant-current network connects LED load;The pfc circuit is by control circuit control System;Control circuit by acquisition pfc circuit output voltage and LED load electric current, and by both signals carry out composite feedback with The output voltage of PFC is controlled, realizes the current constant control to the LED load.
Half-bridge resonance constant-current network can be LCL resonance structure, CLC resonance structure and CLCL resonance structure.Join in resonance In the case that number L, C are certain, LED load electric current is only related with PFC output voltage, in order to reduce the fluctuation of PFC output voltage and The influence to output constant current precision such as resonant network parameter discrete, using PFC output voltage and LED load electric current composite feedback Control method, by composite feedback control PFC output voltage so that LED load constant current hold.Present invention specific implementation Half-bridge resonance constant-current network described in example is based on CLCL type resonant network half bridge resonant transformer.
Further, the pfc circuit uses Boost.
Referring to Fig. 1, control circuit includes that current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage and current are multiple Close circuit and voltage-regulating circuit;LED load electric current is connected through current sampling circuit and matrix current adjustment circuit input;Electric current tune Whole circuit output and the input of voltage and current compound circuit one connect;Pfc circuit output voltage is through voltage sample circuit and voltage electricity Flow another input connection of compound circuit;The output of voltage and current compound circuit is connected with voltage-regulating circuit input;Voltage adjustment electricity Road is exported for controlling pfc circuit output voltage.
The present invention also provides a kind of control methods of High Power Factor LED constant current driving power, provide a High Power Factor LED constant current driving power comprising pfc circuit, half-bridge resonance constant-current network, LED load and control circuit;It is exported using PFC The control method of voltage and LED load electric current composite feedback controls pfc circuit output voltage by composite feedback so that LED is negative Carry constant current hold;When output short-circuit and open circuit, pfc circuit output voltage control is between Vmin and Vmax, control electricity The design on road needs to consider pfc circuit output voltage variation range;The half-bridge circuit of half-bridge resonance constant-current network uses constant frequency control System, working frequency are located near the resonance frequency of half-bridge resonance constant-current network.
Further, the half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformer;CLCL Type resonant network half bridge resonant transformer circuit diagram is referring to fig. 2.It is described to be converted based on CLCL type resonant network half-bridge resonance Device includes switching tube S1, switching tube S2, capacitor Cr, capacitor Cs, inductance Lr, inductance Ls and transformer T1;The switching tube S1's Drain electrode is connect with resonant network input voltage Uin anode, and the source electrode of switching tube S1 is connect with the drain electrode of switching tube S2;Switching tube S2 Source electrode connect with voltage Uin cathode;The one end capacitor Cr is connect with the drain electrode of switching tube S2;The capacitor Cr other end respectively with inductance The one end Lr, the connection of the one end capacitor Cs;The inductance Lr other end is connect with the source electrode of switching tube S2, the capacitor Cs other end and inductance Ls One end connection;The inductance Ls other end is connect with transformer T1 primary one end;The transformer T1 primary other end and the inductance Lr other end Connection;T1 grade of transformer connects LED load;Assuming that transformer T1 magnetizing inductance Lm is sufficiently large, ignore its shadow to load current It rings, Fig. 3 is the equivalent circuit of Fig. 2.
Resonant network equivalent load electric current are as follows:(1);Wherein ReqFor LED load conversion Equivalent resistance to after the transformer primary side of CLCL type resonant network half bridge resonant transformer T1;From formula (1) as can be seen that working asWhen, export current peakWith load resistance ReqIt is unrelated, only with input voltage and humorous Shake relating to parameters, and resonant network works in constant current mode.Fig. 4 is to export electric current I by the calculated resonant network of formula (1)ReqIt is corresponding Frequency characteristic under different loads.As can be seen that in resonance frequency (constant current frequency) frNear, the output of different loads Electric current intersects at a point, and the output electric current of resonant network does not change with the variation of load at this point, that is, it is defeated to be able to achieve constant current Out.
Further, the control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage Electric current compound circuit and voltage-regulating circuit;Matrix current adjustment circuit is by load current feedback signal, current reference and electric current Error amplifier composition, for stablizing output electric current;Voltage and current compound circuit is by the sampled signal of PFC output voltage and load Output signal of the electric current after matrix current adjustment circuit carries out compound, voltage feedback signal of the result as voltage-regulating circuit; Voltage-regulating circuit is made of voltage feedback signal, voltage reference and voltage error amplifier, for controlling PFC output electricity Pressure.
Fig. 5 is High Power Factor LED constant current driving power circuit diagram of the embodiment of the present invention.Pfc circuit is converted using Boost Device, by PFC control chip U1 control, PFC output voltage sampled signal is divided to obtain by resistance R7, R8;Half-bridge constant current resonance electricity Routing switch pipe S1, S2, inductance Lr, Ls, capacitor Cr, Cs and transformer T1 composition, switching tube S1, S2 are by duty ratio respectively 0.5 complementary drive signals Vgs1 and Vgs2 control, half-bridge circuit work in the constant current area of CLCL resonant network, such as Fig. 4 dotted line Shown in frame.LED load is driven by two-way flow equalizing circuit, and routing D6, C9 and LED2 composition, another way is by D5, C0 and LED1 group At C8 is that the equal galvanic electricity of two paths of LED load is held, and Rs is the sample resistance of LED1 electric current;Control circuit by in-phase amplifier U4, Error amplifier U3, subtracter U2 and PFC control chip U1 composition.LED current sampled signal is after in-phase amplifier U4 amplification Compared with reference signal Vref, subtracts each other after error amplifier U3 with PFC output voltage sampled signal and control chip U1 as PFC Voltage feedback signal, make PFC output voltage by voltage sampling signal and LED load electric current complex controll, to realize pair The current constant control of LED light.Fig. 6 is PFC output voltage and LED load current simulations waveform when resonant parameter changes, wherein as it can be seen that When resonant parameter variation, PFC output voltage changes therewith, but exports electric current and be held essentially constant, and realizes constant current.Wherein scheme 6a is Cs=10nF, Ls=258uH, Cr=3.3nF, Lr=500uH;Fig. 6 b is Cs=11nF, Ls=258uH, Cr= 3.3nF, Lr=500uH;Fig. 6 c is Cs=10nF, Ls=283uH, Cr=3.3nF, Lr=500uH.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.

Claims (7)

1. a kind of High Power Factor LED constant current driving power, it is characterised in that: including pfc circuit, half-bridge resonance constant-current network, LED load and control circuit;
Pfc circuit is flowed into after the rectified filtering of electric network source;Pfc circuit output is connected with the input of half-bridge resonance constant-current network;Half The output of bridge resonance constant-current network connects LED load;The pfc circuit is controlled by control circuit;Control circuit passes through acquisition pfc circuit Output voltage and LED load electric current, and both signals are subjected to composite feedback to control the output voltage of PFC, it realizes to institute State the current constant control of LED load;
Control circuit includes current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage and current compound circuit and electricity Press adjustment circuit;
LED load electric current is connected through current sampling circuit and matrix current adjustment circuit input;Matrix current adjustment circuit output and voltage electricity Flow the input connection of compound circuit one;
Pfc circuit output voltage is connected through voltage sample circuit and another input of voltage and current compound circuit;
The output of voltage and current compound circuit is connected with voltage-regulating circuit input;Voltage-regulating circuit output is for controlling PFC electricity Road output voltage.
2. High Power Factor LED constant current driving power according to claim 1, it is characterised in that: the half-bridge resonance is permanent Flow network is based on CLCL type resonant network half bridge resonant transformer.
3. High Power Factor LED constant current driving power according to claim 1, it is characterised in that: the pfc circuit uses Boost.
4. a kind of control method of High Power Factor LED constant current driving power, it is characterised in that: according to claim 1 A kind of High Power Factor LED constant current driving power provides a High Power Factor LED constant current driving power comprising pfc circuit, Half-bridge resonance constant-current network, LED load and control circuit;
A kind of High Power Factor LED constant current driving power according to claim 1, using PFC output voltage and LED load The control method of electric current composite feedback controls pfc circuit output voltage by composite feedback so that LED load electric current keeps permanent It is fixed;
When LED load short circuit and open circuit, pfc circuit output voltage control is between Vmin and Vmax, the design of control circuit Need to consider the variation range of pfc circuit output voltage;The half-bridge circuit of half-bridge resonance constant-current network is controlled using constant frequency, work Frequency is located near the resonance frequency of half-bridge resonance constant-current network.
5. the control method of High Power Factor LED constant current driving power according to claim 4, it is characterised in that: described Half-bridge resonance constant-current network is based on CLCL type resonant network half bridge resonant transformer;
It is described based on CLCL type resonant network half bridge resonant transformer include switching tube S1, switching tube S2, capacitor Cr, capacitor Cs, Inductance Lr, inductance Ls and transformer T1;The drain electrode of the switching tube S1 is connect with resonant network input voltage Uin anode, switch The source electrode of pipe S1 is connect with the drain electrode of switching tube S2;The source electrode of switching tube S2 is connect with voltage Uin cathode;The one end capacitor Cr with open Close the drain electrode connection of pipe S2;The capacitor Cr other end is connect with the one end inductance Lr, the one end capacitor Cs respectively;The inductance Lr other end with open The source electrode connection of pipe S2 is closed, the capacitor Cs other end is connect with the one end inductance Ls;The inductance Ls other end and transformer T1 primary one end Connection;The transformer T1 primary other end is connect with the inductance Lr other end;T1 grade of transformer connects LED load;
Assuming that transformer T1 magnetizing inductance Lm is sufficiently large, ignore its influence to load current, then resonant network equivalent load electricity Stream are as follows:
Wherein ReqFor LED load conversion to the equivalent electricity after the transformer T1 primary side of CLCL type resonant network half bridge resonant transformer Resistance;From formula (1) as can be seen that working asWhen, export current peakWith load resistance ReqIt is unrelated, Only related with input voltage and resonant parameter, resonant network works in constant current mode.
6. the control method of High Power Factor LED constant current driving power according to claim 4, it is characterised in that:
The control circuit include current sampling circuit, matrix current adjustment circuit, voltage sample circuit, voltage and current compound circuit with And voltage-regulating circuit;
Matrix current adjustment circuit is made of load current feedback signal, current reference and current error amplifier, defeated for stablizing Electric current out;Voltage and current compound circuit is defeated after matrix current adjustment circuit by the sampled signal of PFC output voltage and load current Signal carries out compound, voltage feedback signal of the result as voltage-regulating circuit out;Voltage-regulating circuit is by PFC output voltage Feedback signal, voltage reference and voltage error amplifier composition, for controlling PFC output voltage.
7. the control method of High Power Factor LED constant current driving power according to claim 6, it is characterised in that: described Pfc circuit uses Boost, and by PFC control chip U1 control, PFC output voltage sampled signal is divided by resistance R7, R8 It obtains;Half-bridge resonance constant-current circuit is made of switching tube S1, S2, inductance Lr, Ls, capacitor Cr, Cs and transformer T1, switching tube S1, S2 are controlled by complementary drive signals Vgs1 and Vgs2 that duty ratio is 0.5 respectively, and half-bridge circuit works in the perseverance of resonant network Flow area;LED load is driven by two-way flow equalizing circuit, and a routing diode D6, capacitor C9 and LED2 composition, another way is by diode D5, capacitor C0 and LED1 composition, capacitor C8 are that the equal galvanic electricity of two paths of LED load is held, and Rs is the sample resistance of LED1 electric current;Control Circuit is made of in-phase amplifier U4, error amplifier U3, subtracter U2 and PFC control chip U1;LED current sampled signal warp In-phase amplifier U4 amplification after compared with reference signal Vref, after error amplifier U3 with PFC output voltage sampled signal phase Subtract the voltage feedback signal as PFC control chip U1, keeps PFC output voltage multiple by voltage sampling signal and LED load electric current Control is closed, to realize the current constant control to LED light.
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