CN103906289A - Circuit capable of solving problem of high-voltage linear driving strobing - Google Patents
Circuit capable of solving problem of high-voltage linear driving strobing Download PDFInfo
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- CN103906289A CN103906289A CN201410122768.6A CN201410122768A CN103906289A CN 103906289 A CN103906289 A CN 103906289A CN 201410122768 A CN201410122768 A CN 201410122768A CN 103906289 A CN103906289 A CN 103906289A
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Abstract
The invention discloses a circuit capable of solving the problem of strobing of an LED high-voltage linear constant-current driving scheme. The circuit comprises a rectifying circuit body, a high-voltage linear constant-current driving IC body, an LED lamp string and a capacitor charging and discharging circuit body. The rectifying circuit body converts directly-input alternating-current voltage signals into pulse direct-current signals. The high-voltage linear constant-current driving IC body converts the pulse direct-current signals into voltage applicable to each segment of LEDs in a sectional mode and proper constant currents are provided for the LEDs. The LED lamp string comprises the LEDs and an isolating diode. The capacitor charging and discharging circuit body comprises a capacitor charging circuit and a capacitor discharging circuit. When the high-voltage linear constant-current IC body is connected, a capacitor is charged. When the high-voltage linear constant-current driving IC body is disconnected, the capacitor discharges to provide energy for the LEDs connected with the capacitor in parallel. Thus, it can be guaranteed that each segment of the LEDs is always turned on in the whole input voltage cycle, and the whole circuit solves the problem of strobing of an LED device on the condition that the input power factor and harmonic waves are not affected.
Description
Technical field
The present invention relates to LED illuminating lamp driving circuit design field, particularly a kind of circuit that solves high-voltage linear driving stroboscopic.
Background technology
Light-emitting diode (LED) solid light source has the advantages such as luminous efficiency is high, environmental protection, long-life, be described as the 5th generation lighting source.Because the efficiency of LED light fixture is high, good energy-conserving effect, LED light fixture has progressively substituted white light, and LED light fixture has started to move to maturity.
In theory, the useful life of LED is more than 100,000 hours, but in the useful process of reality, because LED adopts traditional switch power drives mode, be subject to the restriction in inner low life-span of electrochemical capacitor, cause the life-span of the whole lamp of LED mostly lower than 10,000 hours, seriously restrict the development of LED product.
At present in order to solve the bottleneck problem of this technology, a lot of experts, scholar, enterprise start to research and develop the novel Driving technique of LED, no electrolytic capacitor high-voltage linear constant current drive IC technology is rapidly developed, and this Driving technique power factor is high, volume is little, cost is low, reliability is high, the life-span matches with LED light source; But in the case of the energy storage that there is no electrochemical capacitor, the luminous stroboscopic that has 100HZ left and right of light fixture; Although naked eyes can not directly be perceiveed out, in some special applications, the stroboscopic of light fixture can affect take pictures, illuminating effect etc.
In order to settle the matter once and for all, if the electrochemical capacitor directly strengthening in rectification circuit back solves stroboscopic problem, can cause the power factor of whole circuit to reduce, harmonic wave increases; Have a strong impact on the input electrical characteristic of whole light fixture, can not meet the standard-required of country to lighting electric.
In sum, also there is a lot of weak points in prior art, awaits further improving.
Summary of the invention
The problem that the object of the invention is to prior art to exist is solved, and especially needs to solve the problem that adopts the LED light fixture of high-voltage linear constant current drive IC scheme in use to have stroboscopic.
For reaching above object, the present invention adopts following technical scheme to be achieved:
Solve the circuit that linear low density drives stroboscopic, described circuit comprises the rectification circuit, high-voltage linear constant current driver IC circuits, LED lamp string and the capacitor charging discharge circuit that connect successively; Electric capacity in described capacitor charging discharge circuit, resistance are in parallel with the LED light-emitting diode in described LED lamp string, and isolating diode is connected with described LED light-emitting diode.
Further, rectification circuit converts the direct input AC signal of telecommunication to pulsating direct current signal; And for high-voltage linear constant current driver IC circuits provides operating voltage;
Further, high-voltage linear constant current drive IC is that multi-stage constant current driving IC chip is directly inputted in special interchange, and driving IC chip circuit can be according to the threshold voltage of every section of LED light-emitting diode, turn-on and turn-off LED light-emitting diode respectively; And for every section of LED provides suitable constant current;
Further, LED lamp string circuit comprises LED light-emitting diode and rectifier diode; Rectifier diode directly and LED string and electric capacity, resistance series connection, for LED provides conducting loop, is also kept apart every section of LED light-emitting diode not influence each other within the cycle of LED shutoff;
Further, capacitor charging discharge circuit is made up of LED light-emitting diode, capacitor C, resistance R; In the time that input voltage raises, voltage reaches after the threshold voltage of first paragraph LED light-emitting diode, and first paragraph LED LED circuit starts conducting; Within the cycle of first paragraph LED light-emitting diode conducting, input voltage is the capacitor C charging to first paragraph LED parallel connection by rectifier diode D; Along with the rising of input voltage, in the time that input voltage amplitude reaches front two sections of LED light-emitting diode threshold voltage sums, high-voltage linear constant current drive IC can be turn-offed the LED light-emitting diode of first paragraph conducting; Now the capacitor C of first paragraph LED parallel connection also stops charging, starting provides voltage to the first paragraph LED light-emitting diode turn-offing, and start to discharge, before next input voltage cycle first paragraph LED light-emitting diode again conducting, always by capacitor C for first paragraph LED light-emitting diode provide can, maintain the brightness of first paragraph LED light-emitting diode.The charge and discharge circuit operation principle of other three sections of LED is identical with first paragraph; The in the situation that of every section of LED light-emitting diode of high-voltage linear constant current drive IC turn-on and turn-off, capacitor C can be charged in time and be provided enough energy to LED light-emitting diode in parallel, maintains the energy of LED light-emitting diode; And do not affect the operating characteristic of high-voltage linear constant current driving IC chip; Keep higher input power factor.
Compared with prior art, the invention discloses a kind of solution for LED stroboscopic in high-voltage linear constant current driver IC circuits; By increase charge-discharge circuit in high-voltage linear constant current drive IC scheme circuit; Simple circuit connects and few device, has thoroughly solved the stroboscopic problem of LED light fixture in the situation that not affecting whole circuit power factor.
Brief description of the drawings
Fig. 1 is the particular circuit configurations schematic diagram of an embodiment provided by the present invention;
Fig. 2 is LED matrix input voltage, the current waveform figure after Fig. 1 applies.
Embodiment
Embodiment
Below in conjunction with brief description of the drawings the specific embodiment of the present invention.
As shown in Figure 1, the invention discloses a kind of circuit that solves high-voltage linear constant current driving stroboscopic; This circuit comprises rectification circuit, high-voltage linear constant current driver IC circuits, LED lamp string, capacitor charging discharge circuit; Rectification circuit converts direct input ac voltage signal to pulsating direct current signal; High-voltage linear constant current driver IC circuits changes into pulsating direct current signal subsection to be applicable to the voltage of every section of LED, and provides suitable constant current for LED light-emitting diode; Capacitor charging discharge circuit comprises capacitor charging circuit and capacitor discharging circuit, when the conducting of high-voltage linear constant current driver IC circuits to capacitor charging, the LED light-emitting diodes tube discharge that electric capacity is its parallel connection in the time that high-voltage linear constant current driver IC circuits is turn-offed provides energy, can ensure that every section of light-emitting diode lights within the whole input voltage cycle always.
Rectification circuit is mainly made up of rectifier bridge; Convert the ac voltage signal of input to direct current signal;
High-voltage linear constant current driver IC circuits, is mainly made up of high-voltage linear constant current driving IC chip and peripheral resistance; By the DC-voltage supply after rectification, direct and LED light-emitting diode series winding is connected together; For the suitable voltage and current of providing of every section of LED;
LED lamp string; Mainly formed by diode D1, D2, D3, D4 and LED 1, LED2, LED3, LED4;
Capacitor charging discharge circuit, has four sections of LED in the present embodiment scheme; Be respectively LED1, LED2, LED3, LED4; Every section of LED has independently charge and discharge circuit; For LED light-emitting diode separately provides energy;
Described first paragraph LED1; LED1 and C1, R1 parallel connection; Connect with D1; When input voltage raises, when the direct voltage amplitude after rectification exceedes the threshold voltage of LED1, LED1 starts conducting; Slowly brighten; Electric current is flow through and is entered high-voltage linear constant current drive IC and carry out constant current control by D1, LED1; Within the time of LED1 conducting, input voltage charges to C1 by D1; Until LED1 is while being turned off, charging stops; Now C1 starts the electric discharge to LED1, and C1, two devices of LED1 form discharge loop; For LED1 continues to provide energy; Maintain the brightness of LED1 within the cycle of high-voltage linear constant current drive IC shutoff; Discharge process lasts till that D1 is again when conducting; C1 changes into again charged state; R1 resistance is used for discharging the residual voltage of C1;
Described second segment LED2; LED2 and C2, R2 parallel connection, and D2 series connection; When input voltage continues to raise, when the direct voltage amplitude after rectification exceedes the threshold voltage sum of LED1+LED2, LED1 and LED2 conducting simultaneously, slowly brightens; Electric current is flow through and is entered high-voltage linear constant current drive IC and carry out constant current control by D1, LED1, D2, LED2; Within the time of LED1 and LED2 conducting simultaneously, input voltage charges to C2 by D2; Until LED2 is while being turned off, charging stops; Now C2 starts the electric discharge to LED2, and C2, two devices of LED2 form discharge loop; For LED2 continues to provide energy, maintain the brightness in the cycle that LED2 turn-offs in high-voltage linear constant current drive IC, discharge process continues D2 again when conducting, and C2 changes into again charged state; R2 resistance is used for discharging the residual voltage of C2;
Described the 3rd section of LED3; LED3 and C3, R3 parallel connection, and D3 series connection; When input voltage continues to raise, when the direct voltage amplitude after rectification exceedes the threshold voltage sum of LED1+LED2+LED3, LED1, LED2 and LED3 conducting simultaneously, slowly brightens; Electric current is flow through and is entered high-voltage linear constant current drive IC and carry out constant current control by D1, LED1, D2, LED2, D3, LED3; Within the time of LED1, LED2 and LED3 conducting simultaneously, input voltage charges to C3 by D3; Until LED3 is while being turned off, charging stops, now C3 starts to discharge to LED3, C3, two devices of LED3 form discharge loop, for LED3 continues to provide energy, maintain the brightness in the cycle that LED3 turn-offs in high-voltage linear constant current drive IC, discharge process continues D3 again when conducting, C3 changes into again charged state, and R3 resistance is used for discharging the residual voltage of C3.
Described the 4th section of LED4; LED4 and C4, R4 parallel connection, and D4 series connection; When input voltage continues to raise, when the direct voltage amplitude after rectification exceedes the threshold voltage sum of LED1+LED2+LED3+LED4, LED1, LED2, LED3 and LED4 conducting simultaneously, slowly brightens; Electric current is flow through and is entered high-voltage linear constant current drive IC and carry out constant current control by D1, LED1, D2, LED2, D3, LED3, D4, LED4; Within the time of LED1, LED2, LED3 and LED4 conducting simultaneously, input voltage charges to C4 by D4; Until LED4 is while being turned off, charging stops, now C4 starts to discharge to LED4, C4, two devices of LED4 form discharge loop, for LED4 continues to provide energy, maintain the brightness in the cycle that LED4 turn-offs in high-voltage linear constant current drive IC, discharge process continues D4 again when conducting, C4 changes into again charged state, and R4 resistance is used for discharging the residual voltage of C4.
It should be noted that, the high-voltage linear constant current drive IC in the present embodiment, can be substituted by the driving IC chip of multi-form specification; Also can mutually replace with the discrete circuit that can realize said function, but within all belonging to the range of application of indication of the present invention.
The above embodiment has only expressed one of the present invention preferred embodiment, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be noted that; for the person of ordinary skill of the art; without departing from the inventive concept of the premise; can also make some distortion and improvement; for example the embodiment of the present invention increase or reduce LED number of fragments or increase, reduce some external devices, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (3)
1. solve the circuit that high-voltage linear drives stroboscopic, it is characterized in that, described circuit comprises the rectification circuit, high-voltage linear constant current driver IC circuits, LED lamp string and the capacitor charging discharge circuit that connect successively; Electric capacity in described capacitor charging discharge circuit, resistance are in parallel with the LED light-emitting diode in described LED lamp string, and isolating diode is connected with described LED light-emitting diode.
2. solution high-voltage linear according to claim 1 drives the circuit of stroboscopic, it is characterized in that, whole LED serializer circuit has been divided into four sections by described high-voltage linear constant current driver IC circuits; LED1, LED2, LED3, LED4 light-emitting diode are lighted in segmentation.
3. solution high-voltage linear according to claim 1 drives the circuit of stroboscopic, it is characterized in that, described charge and discharge circuit is made up of diode D, LED, resistance R, capacitor C; In the time that input voltage reaches the threshold voltage of LED light-emitting diode, LED starts to light, and charges to capacitor C by isolating diode D; In the time that constant current driver IC circuits is turn-offed this LED string, electric capacity also C stops charging; At this moment capacitor C and LED light-emitting diode form discharge loop; To LED light-emitting diodes tube discharge, maintain the brightness of LED by capacitor C, resistance R, with capacitor C parallel connection, can discharge the unnecessary energy of capacitor C.
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| CN201410122768.6A CN103906289A (en) | 2014-03-28 | 2014-03-28 | Circuit capable of solving problem of high-voltage linear driving strobing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105025627A (en) * | 2015-07-27 | 2015-11-04 | 苏州智浦芯联电子科技有限公司 | LED (Light-Emitting Diode) driving circuit packaging structure packaged with rectifier bridge device and illuminating system |
| CN105491721A (en) * | 2015-12-31 | 2016-04-13 | 吴文武 | Wide-adaptability LED full-voltage drive circuit |
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
| CN106231741A (en) * | 2016-10-13 | 2016-12-14 | 伊戈尔电气股份有限公司 | The anti-dim light circuit of the LED light source that a kind of linear constant current drives |
| CN107524934A (en) * | 2017-10-18 | 2017-12-29 | 安徽建筑大学 | A kind of AC light-emitting diode lamp tool |
| CN108811232A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | LED driving circuit |
| CN110418450A (en) * | 2018-04-27 | 2019-11-05 | 广州市番禺奥莱照明电器有限公司 | A kind of one kind sense light has the solution of remaining light after turning off the light |
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| CN102209415A (en) * | 2011-05-30 | 2011-10-05 | 桂林源通网络软件有限公司朝阳路分公司 | Light emitting diode (LED) alternating-current direct power supply circuit |
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| CN203775453U (en) * | 2014-03-28 | 2014-08-13 | 广州瀚富新材料科技有限公司 | Circuit for solving high-voltage linear drive stroboflash |
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| US20100134018A1 (en) * | 2008-11-30 | 2010-06-03 | Microsemi Corp. - Analog Mixed Signal Group Ltd. | Led string driver with light intensity responsive to input voltage |
| CN201758472U (en) * | 2010-03-19 | 2011-03-09 | 技领半导体(上海)有限公司 | LED lighting string circuit containing long strings connected by a plurality of short strings |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105025627A (en) * | 2015-07-27 | 2015-11-04 | 苏州智浦芯联电子科技有限公司 | LED (Light-Emitting Diode) driving circuit packaging structure packaged with rectifier bridge device and illuminating system |
| CN105764178A (en) * | 2015-12-16 | 2016-07-13 | 上海大学 | Stroboflash-free sectional type constant-current LED driving circuit |
| CN105491721A (en) * | 2015-12-31 | 2016-04-13 | 吴文武 | Wide-adaptability LED full-voltage drive circuit |
| CN106231741A (en) * | 2016-10-13 | 2016-12-14 | 伊戈尔电气股份有限公司 | The anti-dim light circuit of the LED light source that a kind of linear constant current drives |
| CN108811232A (en) * | 2017-05-05 | 2018-11-13 | 东莞艾笛森光电有限公司 | LED driving circuit |
| CN108811232B (en) * | 2017-05-05 | 2020-04-07 | 东莞艾笛森光电有限公司 | Light emitting diode driving circuit |
| CN107524934A (en) * | 2017-10-18 | 2017-12-29 | 安徽建筑大学 | A kind of AC light-emitting diode lamp tool |
| CN110418450A (en) * | 2018-04-27 | 2019-11-05 | 广州市番禺奥莱照明电器有限公司 | A kind of one kind sense light has the solution of remaining light after turning off the light |
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Application publication date: 20140702 |