CN105764178A - Stroboflash-free sectional type constant-current LED driving circuit - Google Patents
Stroboflash-free sectional type constant-current LED driving circuit Download PDFInfo
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- CN105764178A CN105764178A CN201510941658.7A CN201510941658A CN105764178A CN 105764178 A CN105764178 A CN 105764178A CN 201510941658 A CN201510941658 A CN 201510941658A CN 105764178 A CN105764178 A CN 105764178A
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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
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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
- 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]
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Abstract
The invention relates to a stroboflash-free sectional type constant-current LED driving circuit. The stroboflash-free sectional type constant-current LED driving circuit comprises an LC low-pass filtering circuit, a rectification filtering circuit, a bridge inversion circuit, an LC resonance filtering circuit and a sectional type constant-current LED driving circuit. The sectional type constant-current LED driving circuit is enabled to have quite high versatility and adaptability, and the application scope of a sectional type driving scheme in the field of LED illumination is expanded.
Description
Technical field
The invention belongs to technical field of LED illumination, directly drive LED drive circuit especially for exchange, it is proposed that a kind of stagewise constant current LED drive circuit directly driven without the exchange of stroboscopic.
Background technology
LED is forth generation lighting source.LED has the feature such as energy-saving and environmental protection, efficient, safety, therefore, is widely used in the illumination occasions such as view, street lamp and electronic product backlight.Along with LED illumination is in the application of a lot of occasions, the ripe efficient LED drive power of design is vital link in LED illumination.
LED is to driving power supply to have strict requirement, and LED drive circuit is all adopt constant-current driving LED loaded work piece.Although traditional two-stage drive circuit arrangement can reach significantly high driveability, but it is many to there is device used, and driver size is big, the shortcoming that expense is high.From development prospect, current volume is little, integrated, lightweight, is LED drive power common technology in future developing direction, adopts the general orientation that civil power develops directly to LED power supply mode LED drive power especially.
Exchange comparatively popular at present directly drives the mode of LED to be stagewise constant-current LED type of drive, Main Basis alternating voltage tracing type principle proposes, namely adopt staged type of drive progressively light LED load, based on this class method LED drive scheme common structure as shown in Figure 1:
This drive circuit main circuit generally comprises rectification circuit, sample circuit, control circuit, on-off circuit and current control circuit.Sample circuit is the voltage and current signal needed for ON-OFF control circuit offer；ON-OFF control circuit controls the open and close of each section of LED, and switching device mostly is high-voltage MOS pipe；Current control circuit controls the change procedure of LED current, can realize each section of constant current or unsteady flow according to the requirement of design.As can be seen here, the core of this driving method is by switching device, LED load to be carried out packet to drive, so that each group LED load is in turn lighted and extinguishing along with the change of input voltage, and obtains desired LED current waveform by current control circuit.
But for exchanging the drive circuit of the directly stagewise constant-current LED of driving, owing to not having electrochemical capacitor, driving the AC compounent containing twice power frequency in electric current, therefore there is the stroboscopic of 100Hz in LED under 50Hz civil power.Although the frequency that the stroboscopic of 100Hz persists higher than human eye vision, human eye cannot this frequency of perception light pulsation, but research in recent years finds, long-term work under this light source having stroboscopic, the visual system of human eye needs constantly to regulate, and to ensure the clarity of imaging on retina, this can increase the weight of the burden of human eye, produce to use eyestrain's phenomenon, thus constraining the extensive use of this class LED drive scheme.
In order to reduce the harm of stroboscopic, existing solution is parallel filtering electric capacity after rectification circuit mainly, the program utilizes electrochemical capacitor absorption portion AC ripple, but when ripple control (10%) after certain limit, it is difficult to further reduce, stroboscopic phenomenon cannot be eliminated, and electrochemical capacitor can increase the problem of volume, life-span aspect, be difficult to meet alternating-current direct and drive power supply small size, requirement highly reliable, easy of integration.Ye You LED chip producer proposes employing and fills out paddy technology, a certain amount of electric charge is stored in filling out paddy electric capacity, when the voltage after all wave rectification is down near zero-crossing point, fill out paddy electric capacity LED string is discharged, ensure that in the whole commutation cycle, LED load output light efficiency is constant, but also simply alleviate stroboscopic phenomenon to a certain extent.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the problem that present invention is primarily intended to solve the 100HZ stroboscopic that existing stagewise constant current LED drive circuit exists.A kind of stagewise constant current LED drive circuit without stroboscopic is provided, utilize bridge inverter main circuit can improve the feature of AC signal frequency, by improving the operating frequency of the input signal of stagewise constant current LED drive circuit, possessing, the basis of stagewise constant current LED drive circuit feature realizes the LED load function without stroboscopic, stagewise constant current LED drive circuit is made to have stronger versatility and the suitability, thus improve the range of application in field of LED illumination of stagewise drive scheme.
In order to achieve the above object, insight of the invention is that
The stagewise constant current LED drive circuit without stroboscopic that the present invention proposes, by mains signal after rectifying and wave-filtering, by bridge inverter main circuit and LC resonator filter circuit, it is changed into the high frequency nearly sine wave AC signal input signal as stagewise constant current LED drive circuit, thus improve the operating frequency of the pulsating current flowing through LED load, solve 50HZ electric main and directly drive the problem that in LED scheme, LED load exists 100HZ stroboscopic, it is achieved that LED load is without stroboscopic.
The output of the high frequency ac signal (more than 1KHZ) in the present invention can be produced by bridge inverter main circuit, by controlling the turn-on and turn-off of switching tube, d. c. voltage signal after rectifying and wave-filtering is converted to high frequency square wave or the output of high frequency quasi-square wave voltage signal, then passes through LC resonator, filter network and obtain high_frequency sine wave signal.High frequency output sine wave inverter circuit structure is as shown in Figure 2.
Described bridge type topology includes full-bridge and half-bridge topology, owing to the voltage stress of bridge type topology switching tube is equal to DC input voitage, use bridge type topology general in the occasion that input ac voltage is 220V or higher.Preferably, when switching tube is MOSFET, by rationally arranging LC resonator, filter network parameter, it is possible to achieve the no-voltage of MOSFET is open-minded, reduce switching loss.Described LC resonator, filter network is passive filter, and including LC series resonance, LC parallel resonance and several topology of LC series parallel resonance, resonator, filter network designs for the frequency of required high frequency ac signal, has good frequency-selective filtering effect.Preferably, when resonator, filter network is LC series parallel resonance network, to the LC of the fundamental series resonance of high frequency square wave with the LC of first-harmonic parallel resonance is used simultaneously, the former makes first-harmonic pressure drop be zero, and harmonic wave then presents perceptual high reactance, and the latter makes the fundamental current summation of parallel circuit be zero, harmonic wave is then presented capacitive Low ESR, there is excellent filtering characteristic, it is possible to make waveform closer to sine wave, the Sofe Switch of switching tube can be realized simultaneously.
For realizing above-mentioned design, the technical solution used in the present invention is:
A kind of stagewise constant current LED drive circuit without stroboscopic, including LC low-pass filter circuit, current rectifying and wave filtering circuit, bridge inverter main circuit, LC resonator filter circuit and stagewise constant current LED drive circuit, it is characterised in that: power supply is successively through LC low-pass filter circuit, current rectifying and wave filtering circuit, bridge inverter main circuit, LC resonator filter circuit is connected to stagewise constant current LED drive circuit；Utilize bridge inverter main circuit can improve the feature of AC signal frequency, by improving the operating frequency of the input signal of stagewise constant current LED drive circuit, possessing, the basis of stagewise constant current LED drive circuit feature realizes the LED load function without stroboscopic.
Described LC low-pass filter circuit 1 is connected to live wire and the zero line side of electric main；Described current rectifying and wave filtering circuit 2 has two inputs and two outfans, and an input couples with LC low-pass filter circuit 1, and another input couples with the zero line of electric main.Two outfans connect described bridge inverter main circuit 3；Described LC resonator filter circuit 4 is connected in parallel on the two ends of described bridge inverter main circuit 3；Described stagewise constant current LED drive circuit 5 is connected with two outfans of described LC resonator filter circuit 4.
Described LC low pass filter can effectively prevent high frequency electric from flowing into exchange input side, and filters higher hamonic wave, reduces the harmonic pollution to electrical network；Described current rectifying and wave filtering circuit includes bridge rectifier and filter capacitor, utilizes the unidirectional general character of diode that electric main is carried out rectification, is converted into the unidirectional current of pulsation, and the unidirectional current of pulsation forms a smooth DC voltage after capacitor filtering；Described bridge inverter main circuit, is converted to the square-wave signal of high frequency by the copped wave of switching tube by direct current signal after rectifying and wave-filtering；Described LC resonator filter circuit, is converted to the nearly sine wave signal of high frequency by high-frequency square-wave signal, as the input signal that described stagewise constant-current LED drives；Described stagewise constant-current circuit, the change in voltage according to input exchange signal, the segmentation realizing LED load by controlling switching device is lighted, and each section is operated in constant current state to adopt linear control technique to ensure.Owing to circuit input signal is the nearly sine wave signal of high frequency, thus improve the operating frequency of the pulsating current flowing through LED load, and then realize the function without stroboscopic.
The present invention compared with prior art, has following apparent prominent substantive distinguishing features and marked improvement:
1. present invention employs LC resonator filter circuit, resonant network has good filtering characteristic and system stability, and resonance circuit can realize the Sofe Switch of bridge inverter main circuit, thus reducing the loss of power supply, improves the efficiency of power supply.
2. the present invention effectively can drive with stagewise LED and combine, compare traditional exchange and directly drive LED scheme, improve the current operating frequency of LED load, eliminate stroboscopic phenomenon, and improve drive efficiency, higher power factor can be obtained, and remain the advantage that original stagewise constant-current LED drives.
3., it addition, bridge inverter main circuit and stagewise constant current LED drive circuit can adopt special LED chip to be controlled, thus the operating frequency realizing integrated circuit is adjustable, stagewise constant current LED drive circuit also can realize dimming function, it is easy to product commercialization.
In sum, stagewise constant current LED drive circuit without stroboscopic of the present invention solves the problem that the LED load existed in the stagewise constant-current LED drive scheme that existing exchange directly drives has 100HZ stroboscopic, integrated circuit simple in construction, volume is little, cost is low, easy modularity, generalization, it is with a wide range of applications.
Accompanying drawing explanation
The stagewise constant-current LED drive scheme figure that the existing exchange of Fig. 1 directly drives
The high frequency output sine wave inverter circuit structured flowchart of Fig. 2 present invention
The stagewise constant-current LED without stroboscopic of Fig. 3 present invention drives structured flowchart
The stagewise constant-current LED without stroboscopic in Fig. 4 embodiment of the present invention drives structured flowchart
The stagewise constant current LED drive circuit schematic diagram without stroboscopic in Fig. 5 embodiment of the present invention.
Detailed description of the invention
Details are as follows in conjunction with accompanying drawing for the preferred embodiments of the present invention:
Embodiment one:
Referring to Fig. 3, the stagewise constant current LED drive circuit of this nothing stroboscopic, including LC low-pass filter circuit 1, current rectifying and wave filtering circuit 2, bridge inverter main circuit 3, LC resonator filter circuit 4 and stagewise constant current LED drive circuit 5, it is characterized in that: power supply is successively through LC low-pass filter circuit 1, current rectifying and wave filtering circuit 2, bridge inverter main circuit 3, LC resonator filter circuit 4 is connected to stagewise constant current LED drive circuit 5；Utilize bridge inverter main circuit can improve the feature of AC signal frequency, by improving the operating frequency of the input signal of stagewise constant current LED drive circuit, possessing, the basis of stagewise constant current LED drive circuit feature realizes the LED load function without stroboscopic.
Embodiment two:
Referring to Fig. 4, the stagewise constant current LED drive circuit of this nothing stroboscopic includes the LC low-pass filter circuit 1 being sequentially connected in series, current rectifying and wave filtering circuit 2, half-bridge inversion circuit 3, LC series parallel resonance circuit 4 and stagewise constant current LED drive circuit 5.
Described LC low pass filter 1 can prevent high frequency electric from flowing into exchange input side, and filters higher hamonic wave, reduces the harmonic pollution to electrical network；The alternating current of input is converted to a relatively smooth unidirectional current of waveform by described current rectifying and wave filtering circuit 2；Direct current signal is converted to the square-wave signal of high frequency by described half-bridge inversion circuit 3 by the copped wave of switching tube；Described LC series parallel resonance circuit 4 has good filtering characteristic, and high-frequency square-wave signal passes through LC series parallel resonance network, it is possible to generate the nearly sine wave signal of high frequency；The input signal of described stagewise LED drive circuit 5 is the nearly sine wave AC signal of high frequency, is controlled the open and close of MOSFET field effect transistor by the ON-OFF control circuit of chip, and then sequentially turns on LED load.Owing to improve the operating frequency of input exchange signal, thus improve the operating frequency of the pulsating current flowing through LED load, solve the problem that in 50HZ electric main direct drive segment formula constant-current LED drive scheme, LED load exists 100HZ stroboscopic, it is achieved that LED load is without stroboscopic.
Especially, the half-bridge inversion circuit described in this example is the one of described bridge inverter main circuit, is not limited to the detailed description of the invention in this example；Described LC series parallel resonance network is the one of described LC resonator, filter network, is also not limited to the detailed description of the invention given by the present invention.It can be that the segmentation LED that a kind of general exchange directly drives drives that described segmentation LED drives, and is also not limited to the detailed description of the invention given by the present invention.
Without stroboscopic stagewise constant current LED drive circuit specific works principle as shown in Figure 5, described LC low-pass filter circuit 1 includes an an inductance L1 and electric capacity C1, wherein inductance L1 is directly connected with ac input end, electric capacity C1 one end is connected with ac input end, one end is connected with inductance L1, and both common ports are connected in current rectifying and wave filtering circuit 2 positive pole of D1 diode；Described half-bridge inversion circuit includes two resistance R1 and R2, two electric capacity C3, C4 and C5, a fast recovery diode D5, two MOSFET field effect transistor Q1 and Q2, wherein resistance R1 and electric capacity C3 series connection, both common ports are connected to the VCC pin of driving chip IR2153；Resistance R2 and electric capacity CT series connection, wherein resistance R2 mono-terminates the CT pin of the public termination driving chip IR2153 of the RT end of driving chip IR2153, resistance R2 and electric capacity C4；Diode D5 and electric capacity C5 is connected between the VCC pin of driving chip and VS pin；Field effect transistor Q1 and Q2 is connected with HO and the LO pin of driving chip IR2153 respectively, and both common ports are connected with the VS pin of driving chip.Described LC series parallel resonance circuit includes two inductance L2 and L3, two electric capacity C6 and C7, and wherein inductance L2 connects driving chip VS pin, inductance L2 and electric capacity C6 series connection, and inductance L3 and electric capacity C7 is in parallel, exports high frequency sinusoidal AC signal.Described stagewise constant-current circuit drive circuit is by 5 diode D6-D10, nine resistance R3-R11, one electric capacity, four switch mosfet pipe Q3-Q6 and driving chip CL2012 composition, diode D6-D9 forms rectification circuit, dropping resistor R9 and C1 connects, both common ports connect the VCC pin of driving chip, resistance R7-R10 forms resistor network, the G1-G4 pin of driving chip connects the G end of switch mosfet pipe Q3-Q6 respectively, resistance R3-R6 connects, wherein resistance R3 connects chip pin S1, the common port of resistance R3 and R4 connects chip pin S2, the common port of resistance R4 and R5 connects chip pin S3, the common port of resistance R5 and R6 connects chip pin S4.
Specific works process
Present example accesses 50HZ industrial frequency AC civil power according to accompanying drawing 5, after inductance L1 and the electric capacity C1 low pass filter 1 formed, can effectively filter out higher hamonic wave, reduce the harmonic pollution to electrical network.Eliminate the alternating current after interference and be converted into a smooth DC bus-bar voltage through current rectifying and wave filtering circuit 2；
DC bus-bar voltage is through charging to the power capacitor C3 of driving chip 3 by dropping resistor R1, and when the terminal voltage of electric capacity C3 exceedes the under-voltage latch-release threshold value of driving chip 3, chip can self-starting.After driving chip 3 is started working, what high-end HO pin and low side output LO pin output signal controlled switch mosfet pipe opens shutoff, and the dutycycle of two switching tubes is all 0.5, and alternating, complementary conducting.Wherein R2 and C4 determines to drive the switching frequency (be more than or equal to 1KHZ) of switching tube.DC bus-bar voltage is after the copped wave of switch mosfet pipe Q1 and Q2, and the VS pin output services frequency of driving chip 3 is equal to the high frequency square wave voltage of switching frequency;
High frequency square wave voltage obtains the nearly sinusoidal voltage of high frequency after the series parallel resonance filter network 4 that inductance L2 and L3, electric capacity C6 and C7 are constituted.Wherein the resonance angular frequency of the series arm that inductance L2 and electric capacity C6 is constituted approximates switching frequency, the resonant frequency of the parallel branch that inductance L3 and electric capacity C7 is constituted is slightly above switching frequency, make whole resonant network in perception, no-voltage to realize MOS switch pipe S is open-minded, thus reducing switching loss, improving and changing efficiency frequency.
High frequency sinusoidal alternating voltage is converted into the Rectified alternating current of high frequency through rectification circuit 5, by the sample circuit within driving chip 6 and ON-OFF control circuit, driving chip 6 is by controlling the turn-on and turn-off of switch mosfet pipe Q3-Q6, thus LED load is grouped, with reach the LED load of each group along with the change of input voltage in turn luminous with the effect extinguished, and obtain desired LED current waveform by the current control circuit within driving chip 6.The electric current wherein flowing through each section of LED load is set by resistance R3-R6, the G1-G4 pin of driving chip control switch mosfet pipe Q3-Q6 alternation at fully on, linear constant current, complete switch off state.Owing to input exchange signal is the AC signal of high frequency, thus improve the operating frequency of the pulsating current flowing through LED load, solve the problem that in 50HZ electric main direct drive segment formula constant-current LED drive scheme, LED load exists 100HZ stroboscopic, it is achieved that LED load is without stroboscopic.
Above the stagewise constant-current LED without stroboscopic of the present invention is driven and be described in detail, and give application this without the circuit diagram of the stagewise constant current LED drive circuit of stroboscopic, those of ordinary skill in the art can realize stagewise constant current LED drive circuit without stroboscopic accordingly accordingly.Stagewise constant current LED drive circuit without stroboscopic of the present invention, solves 50HZ electric main and directly drives the problem that in LED scheme, LED load exists 100HZ stroboscopic, it is achieved that LED load is without stroboscopic.
Claims (5)
1. the stagewise constant current LED drive circuit without stroboscopic, including LC low-pass filter circuit (1), current rectifying and wave filtering circuit (2), bridge inverter main circuit (3), LC resonator filter circuit (4) and stagewise constant current LED drive circuit (5), it is characterised in that: power supply is successively through LC low-pass filter circuit (1), current rectifying and wave filtering circuit (2), bridge inverter main circuit (3), LC resonator filter circuit (4) is connected to stagewise constant current LED drive circuit (5)；Utilize bridge inverter main circuit can improve the feature of AC signal frequency, by improving the operating frequency of the input signal of stagewise constant current LED drive circuit, possessing, the basis of stagewise constant current LED drive circuit feature realizes the LED load function without stroboscopic.
2. a kind of stagewise constant current LED drive circuit without stroboscopic according to claim 1, it is characterized in that: described LC low-pass filter circuit (1) includes an an inductance L1 and electric capacity C1, described inductance L1 is directly connected with ac input end, electric capacity C1 one end is connected with ac input end, the other end is connected with inductance L1, and the common port of inductance L1 and electric capacity C1 is connected to stream filter circuit (2)；Adopt LC low pass filter, can effectively prevent high frequency electric from flowing into exchange input side, and filter higher hamonic wave, reduce the harmonic pollution to electrical network.
3. a kind of stagewise constant current LED drive circuit without stroboscopic according to claim 1, it is characterized in that: adopt bridge inverter main circuit, by the copped wave of switching tube, direct current signal after rectifying and wave-filtering is converted to the square-wave signal of high frequency, improves the operating frequency of integrated circuit.
4. a kind of stagewise constant current LED drive circuit without stroboscopic according to claim 1, it is characterized in that: adopt LC resonator filter circuit, resonant network has good filtering characteristic and system stability, and resonance circuit can realize the Sofe Switch of bridge inverter main circuit, thus reducing the loss of power supply, improve the efficiency of power supply.
5. a kind of stagewise constant current LED drive circuit without stroboscopic described in claim 1, it is characterized in that: adopt stagewise constant current LED drive circuit, the drive circuit change in voltage according to input ac voltage signal, the segmentation realizing LED load by controlling switching device is lighted, and each section is operated in constant current state to adopt linear control technique to ensure, there is topology simple, the feature that power factor is high.
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| CN201510941658.7A CN105764178A (en) | 2015-12-16 | 2015-12-16 | Stroboflash-free sectional type constant-current LED driving circuit |
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| CN201510941658.7A CN105764178A (en) | 2015-12-16 | 2015-12-16 | Stroboflash-free sectional type constant-current LED driving circuit |
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Cited By (3)
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| CN107270147A (en) * | 2017-07-18 | 2017-10-20 | 浙江阳光美加照明有限公司 | The LED filament bulb lamp that a kind of low frequency dodges |
| CN108023488A (en) * | 2017-12-13 | 2018-05-11 | 中国船舶重工集团公司第七〇九研究所 | The sinusoidal constant current light modulating device and its control method of a kind of compact efficient |
| CN112105112A (en) * | 2020-10-15 | 2020-12-18 | 上海黄龙物联网科技有限公司 | BCD-based stroboflash-free alternating-current direct-drive LED driving system and application thereof |
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| CN112105112A (en) * | 2020-10-15 | 2020-12-18 | 上海黄龙物联网科技有限公司 | BCD-based stroboflash-free alternating-current direct-drive LED driving system and application thereof |
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Application publication date: 20160713 |