CN108684104B - L ED automobile headlamp driver based on improved SEPIC soft switch - Google Patents

L ED automobile headlamp driver based on improved SEPIC soft switch Download PDF

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CN108684104B
CN108684104B CN201810505713.1A CN201810505713A CN108684104B CN 108684104 B CN108684104 B CN 108684104B CN 201810505713 A CN201810505713 A CN 201810505713A CN 108684104 B CN108684104 B CN 108684104B
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capacitor
circuit
inductor
diode
main circuit
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CN108684104A (en
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王懿杰
高珊珊
邱玉萍
张相军
管乐诗
徐殿国
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Harbin Institute of Technology
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Harbin Institute 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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

Abstract

A L ED automobile headlamp driver based on an improved SEPIC soft switch belongs to the field of L ED driving and solves the problems of low system efficiency and insufficient and unstable brightness of a driven L ED automobile headlamp of an existing L ED automobile headlamp driver.A main circuit is used for driving a L ED automobile headlamp according to an input driving signal, a target signal output end of the main circuit is connected with a target signal input end of a sampling circuit, a sampling signal output end of the sampling circuit is connected with a sampling signal input end of a control circuit, a driving signal output end of the control circuit is connected with a driving signal input end of the main circuit through a driving circuit, the driving circuit is used for enhancing a driving signal output by the control circuit, and the main circuit can drive the control circuitQCapacitor CQAnd is connected with the switching tube of the improved SEPIC circuit in parallel.

Description

L ED automobile headlamp driver based on improved SEPIC soft switch
Technical Field
The invention relates to an L ED driver, and belongs to the field of L ED driving.
Background
In addition, L ED has high reaction sensitivity, easy control and small volume, so that L ED has great potential advantages in the application of an automobile adaptive front lighting system.
However, the conventional L ED automotive headlamp driver mainly has the following two problems:
the more the switch tubes of the conventional L ED automobile headlamp driver work in a hard switch state, the higher the working frequency of the L ED automobile headlamp driver, the greater the system loss, which results in the lower system efficiency of the conventional L ED automobile headlamp driver.
The conventional L ED automobile headlamp driver is powered by an automobile-mounted storage battery, the rated output voltage of the conventional automobile-mounted storage battery is lower and is mostly 12V or 24V, and the actual output voltage is unstable, so that the conventional L ED automobile headlamp driver has the problems of insufficient brightness and unstable brightness of a L ED automobile headlamp.
Disclosure of Invention
The invention provides a L ED automobile headlamp driver based on an improved SEPIC soft switch, which aims to solve the problems of low system efficiency and insufficient and unstable brightness of a L ED automobile headlamp driven by the conventional L ED automobile headlamp driver.
The L ED automobile headlamp driver based on the improved SEPIC soft switch comprises a main circuit, a sampling circuit, a control circuit and a driving circuit;
the main circuit is used for driving L ED automobile headlamps according to an input driving signal;
the target signal output end of the main circuit is connected with the target signal input end of the sampling circuit, the sampling signal output end of the sampling circuit is connected with the sampling signal input end of the control circuit, and the driving signal output end of the control circuit is connected with the driving signal input end of the main circuit through the driving circuit;
the driving circuit is used for enhancing the driving signal output by the control circuit so as to drive the main circuit;
the main circuit is additionally provided with a capacitor C on the basis of improving the SEPIC circuitQCapacitor CQAnd is connected with the switching tube of the improved SEPIC circuit in parallel.
Preferably, the main circuit comprises a modified SEPIC circuit and a capacitor CQThe improved SEPIC circuit comprises a DC voltage source VgInductor L1Inductor L2Capacitor CsElectricity, electricityContainer CMCapacitor CoResistance RrefDiode DMDiode DoAnd a switching tube;
switch tube is diode D with bodyQThe drain electrode D and the source electrode S of the NMOS tube are respectively connected with the body diode DQThe cathode is connected with the anode;
DC voltage source VgPositive electrode of (2) and inductor L1Is connected to the first terminal of inductor L1While the second terminal of the capacitor C is connected with the capacitor CsFirst end of NMOS tube, drain electrode D of NMOS tube, and capacitor CQFirst terminal of and diode DMIs connected to the anode of a capacitor CsIs simultaneously connected with the diode DoAnode and inductor L2Are connected to a first terminal of a diode DoCathode and capacitor CoIs connected to the first terminal of inductor L2Is simultaneously connected with the diode DMCathode and capacitor CMIs connected to a first terminal of a resistor RrefFirst terminal of (1), capacitor CoSecond terminal of (1), capacitor CMSecond terminal of (1), capacitor CQSecond terminal of the NMOS transistor, source S of the NMOS transistor and DC voltage source VgThe negative electrodes of the two-phase alternating current transformer are all connected with a power ground;
diode DoAnd a capacitor CoAnd resistor RrefThe second ends of the lamp bodies are respectively two access ends of L ED automobile headlamps;
the grid G of the NMOS tube is the driving signal input end of the main circuit, and the resistor RrefThe common end of the L ED automobile headlamp is the target signal output end of the main circuit;
inductor L1And an inductor L2Inductor L operating in CCM mode and DCM mode, respectively1Inductance value of greater than inductor L2The inductance value of (c).
Preferably, the control circuit is implemented by using a SI8271 series chip.
The main circuit of the L ED automobile headlamp driver based on the improved SEPIC soft switch drives L ED automobile headlamps according to input driving signals, the main circuit enables a switching tube to work in a soft switching state in a mode of additionally arranging parallel capacitors at two ends of the switching tube of the existing improved SEPIC circuit so as to reduce system loss, and further solves the problem of low system efficiency of the existing L ED automobile headlamp driver.
Drawings
The L ED vehicle headlamp driver based on the improved SEPIC soft switch according to the invention will be described in more detail hereinafter on the basis of an embodiment and with reference to the accompanying drawings, in which:
FIG. 1 is a schematic circuit diagram of an L ED automotive headlamp driver based on an improved SEPIC soft switch according to an embodiment;
FIG. 2 is a diagram of a first operation mode of the main circuit according to the embodiment;
FIG. 3 is a second operation mode diagram of the main circuit according to the embodiment;
FIG. 4 is a third operation mode diagram of the main circuit according to the embodiment;
FIG. 5 is a diagram of a fourth mode of operation of the main circuit according to the embodiment;
FIG. 6 is a diagram of a fifth mode of operation of the main circuit according to the embodiment;
FIG. 7 is a comprehensive waveform diagram of the main circuit according to the embodiment;
FIG. 8 is a graph of static gain versus different topologies as mentioned in the examples;
FIG. 9 is a waveform diagram of voltage signal and current signal of the NMOS transistor according to the embodiment;
fig. 10 is a schematic circuit diagram of a control circuit according to an embodiment.
Detailed Description
The L ED automobile headlamp driver based on the improved SEPIC soft switch of the invention will be further explained with reference to the attached drawings.
Example (b): the present embodiment will be described in detail with reference to fig. 1 to 10.
Referring to fig. 1, the L ED automotive headlamp driver based on the improved SEPIC soft switch in the embodiment comprises a main circuit, a sampling circuit, a control circuit and a driving circuit;
the main circuit is used for driving L ED automobile headlamps H L according to an input driving signal;
the target signal output end of the main circuit is connected with the target signal input end of the sampling circuit, the sampling signal output end of the sampling circuit is connected with the sampling signal input end of the control circuit, and the driving signal output end of the control circuit is connected with the driving signal input end of the main circuit through the driving circuit;
the driving circuit is used for enhancing the driving signal output by the control circuit so as to drive the main circuit;
the main circuit is additionally provided with a capacitor C on the basis of improving the SEPIC circuitQCapacitor CQAnd is connected with the switching tube of the improved SEPIC circuit in parallel.
The main circuit of the embodiment comprises an improved SEPIC circuit and a capacitor CQThe improved SEPIC circuit comprises a DC voltage source VgInductor L1Inductor L2Capacitor CsCapacitor CMCapacitor CoResistance RrefDiode DMDiode DoAnd a switching tube;
switch tube is diode D with bodyQThe drain electrode D and the source electrode S of the NMOS tube are respectively connected with the body diode DQThe cathode is connected with the anode;
DC voltage source VgPositive electrode of (2) and inductor L1Is connected to the first terminal of inductor L1While the second terminal of the capacitor C is connected with the capacitor CsFirst end of NMOS tube, drain electrode D of NMOS tube, and capacitor CQFirst terminal of and diode DMIs connected to the anode of a capacitor CsIs simultaneously connected with the diode DoAnode and inductor L2Are connected to a first terminal of a diode DoCathode and capacitor CoIs connected to the first terminal of inductor L2Is simultaneously connected with the diode DMCathode and capacitor CMIs connected to a first terminal of a resistor RrefFirst terminal of (1), capacitor CoSecond terminal of (1), capacitor CMSecond terminal of (1), capacitor CQSecond terminal of the NMOS transistor, source S of the NMOS transistor and DC voltage source VgThe negative electrodes of the two-phase alternating current transformer are all connected with a power ground;
diode DoAnd a capacitor CoAnd resistor RrefThe second ends of the lamp bodies are respectively two access ends of L ED automobile headlamps;
the grid G of the NMOS tube is the driving signal input end of the main circuit, and the resistor RrefThe common end of the L ED automobile headlamp is the target signal output end of the main circuit;
inductor L1And an inductor L2Inductor L operating in CCM mode and DCM mode, respectively1Inductance value of greater than inductor L2The inductance value of (c).
The inductor of the embodiment is a planar inductor, and the capacitor of the embodiment is a patch capacitor, so that the size of the L ED automobile headlamp driver can be reduced, and the power density can be improved.
L ED automobile headlamp driver based on improved SEPIC soft switch, diode D, described in this embodimentMAnd a capacitor CMConstituting a voltage-multiplying unit, diode DoAnd a diode DMHas the same working mode and has a capacitance CQAnd parasitic capacitance and inductance L of NMOS transistor2Forming a resonant network, in order to achieve ZVS, i.e. soft switching, inductor L1Need to operate in CCM mode, inductor L2It is necessary to operate in DCM to reduce the ripple of the input current. Capacitor CMAnd a capacitor CsShould be large enough to ensure a constant voltage across the capacitor. Capacitor CoTo output a voltage stabilization capacitor.
The operation mode of the main circuit of the present embodiment is described in detail below with reference to fig. 2 to 7:
fig. 2 is a diagram of a first working mode of the main circuit.
A first mode of operation (t)0-t1)：t0Time of day, capacitance CQInductor L after charging1Through the diode DMTo a capacitor CMThrough a diode DoTo a capacitor CoLikewise, inductor L2Through the diode DMTo a capacitor CMThrough a diode DoTo a capacitor CoDue to inductance L1Inductance value of greater than inductor L2Inductance value of, inductor L1Current ripple on inductor L2At this time, the inductor L1Voltage across and inductance L2The voltage at both ends is equal to the capacitance CMThe voltage across. In this mode of operation, flows through the diode DMAnd a diode DoThe current of (2) is linearly reduced until the current is reduced to zero, and the working mode is ended.
Fig. 3 is a second operation mode diagram of the main circuit.
Second mode of operation (t)1-t2): in this mode of operation, diode DMAnd DoThe diodes are all turned off. Capacitor CQAnd parasitic capacitance and inductance L of NMOS transistor2Resonance begins. When the resonant current icWhen zero, this mode of operation ends. Meanwhile, the voltage between the drain D and the source S of the NMOS transistor resonates to zero.
Fig. 4 is a third operation mode diagram of the main circuit.
A third mode of operation (t)2-t3): due to the reverse voltage between the drain D and the source S of the NMOS tube, the body diode DQBegins to conduct, inductor L1Voltage across and inductance L2The voltage at both ends is equal to the DC voltage source VgOutput voltage of (8), inductor L1And an inductor L2The stored energy and the passing current start to increase linearly.
Fig. 5 is a diagram of a fourth mode of operation of the main circuit.
Fourth mode of operation (t)3-t4)：t3At the moment, the NMOS tube is conducted, zero voltage conduction is realized, and the inductor L1And an inductor L2The current in the NMOS transistor is still linearly increased until the NMOS transistor is cut off.
Fig. 6 is a diagram of a fifth working mode of the main circuit.
Fifth mode of operation (t)4-t5)：t4At the moment, the NMOS tube is cut off, and the capacitor CQAnd starting to charge, and increasing the voltage between the drain D and the source S of the NMOS tube. Due to the capacitance CQThe capacitance value of (2) is very small, and the duration of the working mode is very short. When the voltage between the drain D and the source S of the NMOS tube is increased to the voltage CMWhen the voltages at the two ends are consistent, the capacitor CQThe charging is completed and the working mode is finished.
Fig. 7 is a comprehensive waveform diagram of the main circuit. Wherein v isgsIs the voltage between the grid G and the source S of the NMOS tube, iDoTo flow through a diode DoCurrent of (i) dMTo flow through a diode DMCurrent of vdsIs the voltage between the drain D and the source S of the NMOS tube, idsI L is the current flowing through the drain D and source S of the NMOS transistor1Is flowing through an inductor L1Current of i L2Is flowing through an inductor L2Current of (v L)1Is an inductor L1Voltage across, v L2Is an inductor L2Voltage across, VoIs the output voltage of the main circuit, VgIs the voltage between the grid G of the NMOS tube and the power ground.
The effect of the L ED vehicle headlamp driver based on the improved SEPIC soft switch according to the present embodiment is described in detail below with reference to FIGS. 8 and 9:
fig. 8 is a graph of static gain versus different topologies. As shown in fig. 8, the static gain of the improved SEPIC of the present embodiment is larger than that of the existing boost topology and SEPIC topology in the duty cycle range where soft switching can be achieved. Thus, it can be seen that: compared with the existing boost topological structure and SEPIC topological structure, the main circuit of the invention has great advantages in the aspect of boost ratio and is very in line with the lighting requirements of the automobile headlamp.
According to the 36W L ED driver built in a laboratory test result, the efficiency of the system is as high as 90.91% when the system is fully loaded, and the current waveforms flowing through the drain D and the source S of the NMOS tube and the voltage waveforms between the drain D and the source S of the NMOS tube are shown in fig. 9.
The control principle of the main circuit of the embodiment is as follows:
according to inductor L in FIG. 71Two terminal voltage and inductance L2The waveform of the voltage at two ends can deduce the transfer function of the main circuit under the soft switching condition by utilizing the volt-second balance principle:
Figure BDA0001670703980000051
wherein D is the on duty ratio and Dd＝td/T，td＝t1-t0，Db＝tb/T，tb＝t3-t2And T is a switching period.
According to the transfer function of the main circuit, the output voltage of the system is constant under the condition of soft switching, but the output of the circuit can be adjusted by adjusting the duty ratio D under the condition of non-soft switching, so that closed-loop control is realized.
The L ED automobile headlamp driver based on the improved SEPIC soft switch has the working frequency of 1MHz, and for the high-frequency L ED driver, a control circuit of a switching tube is very important, and the problems of delay and distortion of a driving signal are avoided.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (2)

1. The L ED automobile headlamp driver based on the improved SEPIC soft switch is characterized in that the L ED automobile headlamp driver comprises a main circuit, a sampling circuit, a control circuit and a driving circuit;
the main circuit is used for driving L ED automobile headlamps according to an input driving signal;
the target signal output end of the main circuit is connected with the target signal input end of the sampling circuit, the sampling signal output end of the sampling circuit is connected with the sampling signal input end of the control circuit, and the driving signal output end of the control circuit is connected with the driving signal input end of the main circuit through the driving circuit;
the driving circuit is used for enhancing the driving signal output by the control circuit so as to drive the main circuit;
it is characterized in that the main circuit is additionally provided with a capacitor C on the basis of improving the SEPIC circuitQCapacitor CQThe switching tube is connected with the improved SEPIC circuit in parallel;
the main circuit comprises an improved SEPIC circuit and a capacitor CQThe improved SEPIC circuit comprises a DC voltage source VgInductor L1Inductor L2Capacitor CsCapacitor CMCapacitor CoResistance RrefDiode DMDiode DoAnd a switching tube;
switch tube is diode D with bodyQThe drain electrode D and the source electrode S of the NMOS tube are respectively connected with the body diode DQThe cathode is connected with the anode;
DC voltage source VgPositive electrode of (2) and inductor L1Is connected to the first terminal of inductor L1While the second terminal of the capacitor C is connected with the capacitor CsFirst end of NMOS tube, drain electrode D of NMOS tube, and capacitor CQFirst terminal of and diode DMIs connected to the anode of a capacitor CsIs simultaneously connected with the diode DoAnode and inductor L2Are connected to a first terminal of a diode DoCathode and capacitor CoFirst end phase ofInductor L2Is simultaneously connected with the diode DMCathode and capacitor CMIs connected to a first terminal of a resistor RrefFirst terminal of (1), capacitor CoSecond terminal of (1), capacitor CMSecond terminal of (1), capacitor CQSecond terminal of the NMOS transistor, source S of the NMOS transistor and DC voltage source VgThe negative electrodes of the two-phase alternating current transformer are all connected with a power ground;
diode DoAnd a capacitor CoAnd resistor RrefThe second ends of the lamp bodies are respectively two access ends of L ED automobile headlamps;
the grid G of the NMOS tube is the driving signal input end of the main circuit, and the resistor RrefThe common end of the L ED automobile headlamp is the target signal output end of the main circuit;
inductor L1And an inductor L2Inductor L operating in CCM mode and DCM mode, respectively1Inductance value of greater than inductor L2The inductance value of (c).
2. The improved SEPIC soft switch based L ED automotive headlamp driver of claim 1, wherein the control circuit is implemented using a SI8271 series chip.
CN201810505713.1A 2018-05-23 2018-05-23 L ED automobile headlamp driver based on improved SEPIC soft switch Active CN108684104B (en)

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CN109951072A (en) * 2019-03-26 2019-06-28 哈尔滨工业大学 Novel Soft Switching high step-up ratio converter and its working method based on Sepic circuit
CN110012574B (en) * 2019-04-19 2021-06-01 福州大学 LED drive circuit of hybrid control single-stage bridgeless Sepic and LLC
CN110011543A (en) * 2019-04-26 2019-07-12 哈尔滨工业大学 Based on the high step-up ratio DC/DC converter for improving SEPIC circuit
CN110831291B (en) * 2019-11-22 2021-07-20 哈尔滨工业大学 Sepic soft switch-based LED driver and hybrid driving method thereof

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