CN203596961U - Light-emitting diode (LED) drive circuit - Google Patents
Light-emitting diode (LED) drive circuit Download PDFInfo
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- CN203596961U CN203596961U CN201320833536.2U CN201320833536U CN203596961U CN 203596961 U CN203596961 U CN 203596961U CN 201320833536 U CN201320833536 U CN 201320833536U CN 203596961 U CN203596961 U CN 203596961U
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Abstract
The utility model relates to an light-emitting diode (LED) drive circuit which comprises a rectification module, an LED module and a switching module. The LED module includes multiple LED loads which are connected in series with each. The switching module is used for controlling the ON/OFF states of the LED loads. The rectification module includes a positive half cycle rectification branch, a positive half cycle feed branch, a negative half cycle rectification branch and a negative half cycle feed branch. In the positive half cycle rectification branch, a first power supply end is connected with a first diode through a second diode, and a sixth diode is connected with a second power supply end. In the negative half cycle rectification branch, the second power supply end is connected with a fourth diode through a fifth diode, and a third diode is connected with the first power supply end. In the positive half cycle feed branch, the first power supply end is connected with a fourth diode through a first capacitor; and a fourth capacitor is disposed between the second power supply end and a second output end. In the negative half cycle feed branch, the second power supply end is connected with the first diode through a third capacitor; and the second capacitor is arranged between the first power supply end and the second output end.
Description
Technical field
The utility model relates to a kind of drive circuit, relates in particular to a kind of LED driving circuit.
Background technology
Along with the development of modern industry, the consumption of the energy also increases day by day, energy-conservation, reduce energy consumption and become one of major tasks of Developing, at lighting field, novel LED lighting technology, high energy efficiency utilance is subject to people's favor, but the civilian popularization of LED is really difficult, traces it to its cause, or price is too high, also do not reach ordinary populace acceptable degree.Simultaneously traditional Switching Power Supply, in LED application, has become the bottleneck of restriction LED actual life.Simplify, optimize LED Driving technique, become the task of top priority, exchanging direct driving technologies solves these problems to a great extent, but but cause the stroboscopic problem of LED, although now also do not have conclusive evidence to show the injury of stroboscopic to people, the illumination of high-quality is the target that we pursue.
Along with the development of Electrification Age, the rectifier system of alternating current is development thereupon also, and bridge rectifier is widely used in various circuit, is particularly used for alternating current (AC) to be rectified into direct current (DC).Be illustrated in figure 1 a kind of bridge rectifier of routine.This bridge rectifier comprises 4 diodes 101,102,103,104, and these 4 diodes become electric bridge to connect.At the alternating current of the first input IN1 and the second input IN2 place input, by this bridge rectifier, be transformed to direct current at output OUT1 and OUT2 place.Conventionally can between output OUT1 and OUT2, connect electric capacity 105 in actual applications, press to export galvanic current more.
Due to the impact of filter capacitor 105, after this circuit access load, power factor is lower, cause the waste of electric power resource, therefore in actual applications, often visible circuit as shown in Figure 2, accesses in the bridge rectifier rear end of Fig. 1 the valley fill type circuit of power factor correction being made up of diode 206,207,208 and electric capacity 205,209.In the application of Switching Power Supply, this circuit can, by power factor correction to 0.8 left and right, still increase by three diodes and two electrochemical capacitors, volume is increased, in the time of application, use if do step-down, the voltage of its actual output only has 1/2 of input voltage simultaneously.
Utility model content
In order to overcome existing LED driving circuit technology above shortcomings, the utility model provides a kind of LED driving circuit, it comprises rectification module, LED module and switch module, wherein, described LED module is made up of the multiple LED loads that are one another in series, described rectification module and described multiple LED load loop in series, and described switch module is for controlling the break-make of described multiple LED loads, it is characterized in that
Described rectification module comprises positive half cycle rectification branch road, positive half cycle feed leg, negative half period rectification branch road and negative half period feed leg, wherein,
Described positive half cycle rectification branch road comprises: the first diode, the second diode and the 6th diode, and wherein, the positive pole of the second diode connects the first feeder ear, and negative pole is connected with the positive pole of the first diode; The negative pole of the first diode is connected with the first output of described rectification module; The positive pole of the 6th diode is connected with the second output of described rectification module, and negative pole is connected with the second feeder ear;
Described negative half period rectification branch road comprises: the 3rd diode, the 4th diode and the 5th diode, and wherein, the negative pole of the 3rd diode is connected with the first feeder ear, is anodally connected with the second output of described rectification module; The positive pole of the 5th diode connects the second feeder ear, and negative pole is connected with the positive pole of the 4th diode; The negative pole of the 4th diode is connected with the first output of described rectification module;
Described positive half cycle feed leg also comprises the first electric capacity and the 4th electric capacity, and wherein, one end of the first electric capacity is connected with the positive pole of the 4th diode, and the other end is connected with the first feeder ear; One end of the 4th electric capacity connects the second feeder ear, and the other end connects the second output of described rectification module;
Described negative half period feed leg also comprises the second electric capacity and the 3rd electric capacity, and wherein, one end of the second electric capacity connects the first feeder ear, and the other end connects the second output of described rectification module; One end of the 3rd electric capacity connects the positive pole of the first diode, and the other end connects the second feeder ear;
Described switch module is made up of voltage sample unit and the multiple switch elements that are connected in parallel to each other, wherein, each switch element is arranged between the output of one of them LED load and described second output of described rectification module, to carry out break-make control according to the voltage signal of described voltage sample unit.
According to a preferred implementation, the voltage sample unit of each switch element comprises respectively the first sampling resistor, the second sampling resistor and the first voltage stabilizing didoe, wherein, described the first sampling resistor and described the second sampling resistor are connected between first output and the second output of described rectification module according to the mode being one another in series, and described the first voltage stabilizing didoe connects according to positive pole the mode that the second output and negative pole connect described the first sampling resistor and is connected in parallel to described the second sampling resistor.
According to a preferred implementation, the each switch element in described switch module comprises respectively the first resistance, the second resistance, the 3rd resistance, the first switching tube, second switch pipe and the second voltage stabilizing didoe, wherein,
One end of described the first resistance is connected to described the first sampling resistor and described the second sampling resistor connected node place between the two, and the other end of described the first resistance is connected to the grid of the first switching tube;
The drain electrode of described the first switching tube is connected to the output of drain electrode and the corresponding LED load of second switch pipe via the second resistance, the source electrode of described the first switching tube is connected to described the second output, and the drain electrode of described the first switching tube is also connected to the grid of described second switch pipe via the 3rd resistance; And
The source electrode of described second switch pipe is connected to described the second output, and the positive pole of described the second voltage stabilizing didoe connects described the second output, and the negative pole of described the second voltage stabilizing didoe connects the source electrode of described the first switching tube.
According to a preferred implementation, described the first switching tube and described second switch pipe are MOSFET.
According to a preferred implementation, the diode in described rectification module is rectifier diode or Schottky diode, oppositely 2 times of the withstand voltage input voltage peak value that is at least described rectification module of described rectifier diode.
According to a preferred implementation, in described rectification module described first, second, third and the 4th electric capacity are polarity free capacitor, described first, second, third and the 4th electric capacity withstand voltage be at least 1.5 times of input voltage peak value of described rectification module, the span of described first, second, third in described rectification module and the 4th electric capacity is 22nF to 330nF.
According to a preferred implementation, between the first output of described rectification module and the second output, be connected with smoothing circuit, described smoothing circuit consists of the voltage regulation resistance and the filter capacitor that are one another in series.
According to a preferred implementation, described voltage regulation resistance is less than 2000 ohm.
According to a preferred implementation, described filter capacitor is for having polar capacitor or polarity free capacitor.
According to a preferred implementation, described drive circuit is with the open circuit protection unit being made up of piezo-resistance, thermistor and/or fuse.
The beneficial effects of the utility model are:
Rectification unit adopts the bridge rectifier with power factor emendation function, can effectively improve power factor to 0.9 in practical application circuit more than.Compared with traditional rectification circuit, only increase the polarity free capacitor of two diodes and four low capacities, have advantages of that volume is little, performance good.By the number of lighting of LED load in switch module control LED module, i.e. LED segmentation lighting mode, can effectively reduce the stroboscopic degree of depth, improves lighting experience.After rectifier bridge, connect the resistance and the filter capacitor that are less than 2000 ohm of series connection, can make output dc voltage more stable and there is High Power Factor.
Accompanying drawing explanation
Fig. 1 is conventional bridge rectification circuit schematic diagram;
Fig. 2 is the schematic diagram of conventional bridge rectification circuit access valley fill type circuit of power factor correction;
Fig. 3 is rectification unit basic circuit schematic diagram of the present utility model;
Fig. 4 (a) is the capacitor charge and discharge key diagram of the utility model circuit at the positive half cycle of alternating current;
Fig. 4 (b) is the capacitor charge and discharge key diagram of the utility model circuit at alternating current negative half period;
Fig. 4 (c) is the rectification unit basic circuit schematic diagram that the utility model improves power factor;
Fig. 5 (a) is a kind of basic principle block diagram that LED is lighted in the direct segmentation driving of interchange of the present utility model;
Fig. 5 (b) is the preferred version schematic diagram that LED is lighted in the direct segmentation driving of interchange of the present utility model.
Embodiment
Below in conjunction with accompanying drawing explanation the utility model.Fig. 3 is rectification unit basic circuit schematic diagram of the present utility model.Can find out according to Fig. 3, the LED driving circuit that the utility model provides comprises rectification module 120, LED module 130 and switch module, wherein, LED module 130 by the multiple LED load LED1, the LED2 that are one another in series ..., LEDn form, rectification module 120 and multiple LED loads loop in series, switch module is for controlling the break-make of multiple LED loads.Bridge rectifier with power factor emendation function in rectification module 120 is made up of the polarity free capacitor 307,308,309,310 of 301,302,303,304,305,306 and 4 low capacities of 6 diodes.LED module 130 is made up of the multiple LED loads that are one another in series, and wherein each LED load comprises respectively one or more LED chips that are connected in series.Switch module is made up of voltage sample unit and the multiple switch elements that are connected in parallel to each other, wherein, each switch element is arranged between the output of one of them LED load and the second output OUT2 of rectification module 120, to carry out break-make control according to the voltage signal of voltage sample unit.
As seen from Figure 3, the first feeder ear IN1 is connected to diode 302 anodes, 303 negative terminals and electric capacity 307 one end, 308 one end; Diode 302 negative terminals are connected to diode 301 anodes and electric capacity 309 one end; Electric capacity 307 other ends connect diode 304 anodes and diode 305 negative terminals; The other end of diode 305 anodes connection electric capacity 309 and the second feeder ear IN2, the negative terminal of diode 306, one end of electric capacity 310; The negative terminal of diode 301,304 is connected with output OUT1; The other end of the anode of diode 303,306 and electric capacity 308,310 is connected and is connected with output OUT2.Conventionally can between output OUT1 and OUT2, connect in actual applications electric capacity 311, electric capacity 311 can be to have polar capacitor or polarity free capacitor, if add larger filter capacitor in this rectifier bridge back, power factor is subject to the impact of output filter capacitor, can reach 0.85.
Below in conjunction with the figure that makes a practical application of a principle, the utility model operation principle is described.For convenience of description, in figure, diode is all explained as an example of common rectifier diode example.Load unit can be the load unit of character arbitrarily such as resistive, capacitive, perception.Be illustrated in figure 4 the utility model figure that makes a practical application of a principle, at the positive half cycle of alternating current, electric current is got back to power line through power line, rectifier diode 402, rectifier diode 401, load, rectifier diode 406, forms loop and powers to the load.At voltage ascent stage, by rectifier diode 402, electric capacity 409, forming loop is that electric capacity 409 charges; By electric capacity 408, rectifier diode 406, forming loop is that electric capacity 408 charges simultaneously, and in charging process, electric capacity 408,409 is relation in parallel (loop as shown in solid arrow in Fig. 4 (a)) on circuit structure.Simultaneously, in electric capacity 407,410, the electric charge of storage discharges to LED module through rectifier diode 404, now electric capacity 407,410 is series relationship with alternating current source on circuit structure, has been equivalent to increase the voltage of alternating current source so that load can conducting (loop as shown in dotted arrow in Fig. 4 (a)).
At alternating current negative half period, electric current is got back to power line through power line, rectifier diode 405, rectifier diode 404, load, rectifier diode 403, forms loop and powers to the load.At absolute value of voltage ascent stage, by rectifier diode 405, electric capacity 407, form loop and charge to electric capacity 407; By electric capacity 410, rectifier diode 403, form loop and charge to electric capacity 410 simultaneously, in charging process, electric capacity 407,410 is relation in parallel (loop as shown in solid arrow in Fig. 4 (b)) on circuit structure.Simultaneously, in electric capacity 408,409, the electric charge of storage passes through rectifier diode 401 to load discharge, now electric capacity 408,409 is series relationship with alternating current source on circuit structure, is equivalent to increase alternating current source absolute value of voltage so that LED module can conducting (loop as shown in dotted arrow in Fig. 4 (b)).
By above process, four electric capacity alternately discharge and recharge, improve the utilance of each half period of alternating current, increase the current lead-through time in each ac period, make input current waveform approach input voltage waveform as far as possible, reduced current harmonics, thereby improved the stability of output voltage, and improve the power factor of circuit, can effectively improve power factor to 0.9 in practical application circuit more than.By the lighting or extinguish of the corresponding LED load of switch element control in switch module, can realize the segmentation of LED load in LED module 130 and light, can play reduction stroboscopic, improve the effect of alternating current utilance.
According to a preferred implementation, in rectification module 120, diode 301,302,303,304,305,306 can be common rectifier diode, rectifier diode is withstand voltage 2 times of being at least input ac voltage peak value oppositely, can be also other components and parts that meet the Schottky diode of this withstand voltage condition or can realize identical function.Withstand voltage 1.5 times of being at least input AC electricity peak value of nonpolarity little electric capacity 307,308,309,310 in rectification module 120, its capacitance is 22nF～330nF.The magnitude of voltage that electric capacity 307,308,309,310 bears is greater than the peak value of out-put supply, avoids the impact of voltage peak, and described electric capacity is withstand voltage at least wants 1.5 times of input voltage peak value.Simultaneously, stage Capacitance parallel connection charging at magnitude of voltage lower than loaded work piece voltage, therefore electric capacity used should not be too large, otherwise can affect the overall performance of circuit, reduce the power factor correction effect to circuit, electric capacity is too little can not provide enough power outputs, need to adopt described electric capacity value 22nF-330nF according to load.
As shown in Figure 4 (c), the first output OUT1 of rectification module 120 connects filter capacitor 311 by resistance 312, described filter capacitor 311 connects the second output OUT2, and described resistance 312 is less than 2000 ohm, and described filter capacitor 311 is for having polar capacitor or polarity free capacitor.Conventionally can increase in actual applications filter capacitor, as shown in figure 311, press to obtain galvanic current more.Due to the effect of above-mentioned the utility model operation principle, the power factor of the technical scheme that the utility model provides can not be subject to the impact of this filter capacitor or affect very little.But the power factor of traditional bridge rectifier can be subject to the impact of filter capacitor and become very low.The utility model adds larger filter capacitor 311 in rectifier bridge back, power factor is subject to the impact of output filter capacitor, can reach 0.85.Be less than the resistance of 2000 ohm by connecting one as Fig. 4 (c) on filter capacitor, can make power keep more than 0.9 because of factor.
Fig. 5 (a) shows segmentation that a kind of interchange with power factor correction of the utility model directly drives and lights a kind of basic principle block diagram of LED; rectifier bridge by the power factor correction of the utility model band substitutes traditional rectifier bridge; also comprise input protection simultaneously; voltage sample unit, switch element.When the voltage after rectifier bridge reach first group of LED load LED1 light voltage time, open unit 1 closure, switch element 2 to switch element N-1 disconnects; When voltage is elevated to the second switched voltage, switch element 2 closures, other switches all disconnect.The overcurrent of input protection to power supply input, overvoltage has protective effect.Switch element can be controlled corresponding LED load, realizes LED segmentation and lights.There is non-luminous time period in existing LED alternating-current direct driving circuit, shows as LED stroboscopic, adopts AC rectification circuit of the present utility model in conjunction with LED segmentation lighting mode, can effectively reduce the stroboscopic degree of depth, improves lighting experience.
As Fig. 5 (b) is depicted as segmentation that a kind of interchange with power factor correction directly drives and lights the preferred version schematic diagram of LED, comprise input protection unit, with the rectifier bridge of power factor correction, sampling unit, switch element.The described rectifier bridge with power factor correction is a kind of bridge rectifier with power factor emendation function of the utility model; Sampling unit is made up of sampling resistor.Switch element is made up of the drive circuit of MOSFET and MOSFET, and switching tube can be also other electronic devices and components with equal effect.Can be according to the actual needs in application, the mode of points two sections or multistage.Described protected location can be made up of piezo-resistance, thermistor, fuse, also can comprise common mode choke and gas discharge tube while being applied to particular surroundings.Input protection circuit is to the overcurrent in ac input circuit, overvoltage protection and metering function.Fuse provides safeguard protection, and general insurance silk specification can be chosen the specified input current of 1.5-2 times, if the input voltage range of rectification module is quite wide, fuse should be selected the maximum input current of 2 times.
Electric main enters Circuits System through protected location, i.e. a kind of feeder ear of the rectifier bridge with power factor correction, about the course of work of this rectifier bridge repeats no more.Resistance 312 one end are connected to rectifier bridge output plus terminal, and resistance 312 other ends are connected to one end of electric capacity 311, and the other end of electric capacity 311 is connected to rectifier bridge output negative terminal.The effect of resistance 312 and electric capacity 311 is voltage waveforms after level and smooth rectifier bridge to a certain extent, reduces the stroboscopic degree of depth of LED.One end of resistance 313 is connected to rectifier bridge output plus terminal; One end, voltage stabilizing didoe 315 negative terminals of the other end of resistance 313, one end of resistance 314, resistance 316 link together; The other end of resistance 316 is connected to the grid of switching tube 317; The drain electrode of one end of resistance 318 and switching tube 320 links together as the second output, one end of the other end of resistance 318, resistance 321, the negative terminal of voltage stabilizing didoe 319, is jointly connected to the drain electrode of switching tube 317; Resistance 314 other ends, voltage stabilizing didoe 315 anodes, switching tube 317 source electrodes, voltage stabilizing didoe 309 anodes, switching tube 321 source electrodes, be connected to rectification unit output negative terminal jointly; The anode of first order load LED1 is connected to rectifier bridge output plus terminal, and the negative terminal of first order load LED1 is connected to the second output; The anode of second level load LED2 is connected to the second output, and the negative terminal of second level load LED2 is connected to rectifier bridge output negative terminal.
When terminal voltage after rectifier bridge is during lower than the first switch element switched voltage, switching tube 320 conductings, second level load LED2 is by short circuit, only has first order load LED1 access, after terminal voltage after rectifier bridge is elevated to switched voltage gradually, the first switch element disconnects, and first order load LED1 and second level load LED2 access simultaneously, and it is luminous that two LED loads are both work.Because a kind of rectifier bridge with power factor correction of the utility model has at voltage during higher than the conducting voltage of LED load, Capacitance parallel connection charging on rectifier bridge, during lower than LED load conducting voltage, the characteristic of discharged in series, therefore a kind of rectifier bridge with power factor correction of the utility model, can make LED, in the time period lower than LED load conducting voltage, also can make LED conducting luminous, thereby reach the effect that reduces the LED stroboscopic degree of depth at input civil power instantaneous value.
The utility model at least has the following advantages:
1, rectification unit adopts the bridge rectifier with power factor emendation function, can effectively improve power factor to 0.9 in practical application circuit more than.
2, compared with traditional rectification circuit, only increase the polarity free capacitor of two diodes and four low capacities, have advantages of that volume is little, performance good.
3, after rectifier bridge, connect the resistance and the filter capacitor that are less than 2000 ohm of series connection, can make output dc voltage more stable and there is High Power Factor.
4, by the number of lighting of LED load in switch module control LED module, i.e. LED segmentation lighting mode, can effectively reduce the stroboscopic degree of depth, improves lighting experience.
It should be noted that; above-mentioned specific embodiment is exemplary; under above-mentioned instruction of the present utility model, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion drop in protection range of the present utility model.It will be understood by those skilled in the art that specific descriptions are above in order to explain the purpose of this utility model, not for limiting the utility model.Protection range of the present utility model is limited by claim and equivalent thereof.
Claims (10)
1. a LED driving circuit, it comprises rectification module (120), LED module (130) and switch module, wherein, described LED module (130) by the multiple LED loads that are one another in series (LED1, LED2 ..., LEDn) form, described rectification module (120) and described multiple LED loads loop in series, described switch module is for controlling the break-make of described multiple LED loads
It is characterized in that,
Described rectification module (120) comprises positive half cycle rectification branch road, positive half cycle feed leg, negative half period rectification branch road and negative half period feed leg, wherein,
Described positive half cycle rectification branch road comprises: the first diode (301), the second diode (302) and the 6th diode (306), wherein, the positive pole of the second diode (302) connects the first feeder ear (IN1), and negative pole is connected with the positive pole of the first diode (301); The negative pole of the first diode (301) is connected with first output (OUT1) of described rectification module (120); The positive pole of the 6th diode (306) is connected with second output (OUT2) of described rectification module (120), and negative pole is connected with the second feeder ear (IN2);
Described negative half period rectification branch road comprises: the 3rd diode (303), the 4th diode (304) and the 5th diode (305), wherein, the negative pole of the 3rd diode (303) is connected with the first feeder ear (IN1), and second output (OUT2) of anodal and described rectification module (120) is connected; The positive pole of the 5th diode (305) connects the second feeder ear (IN2), and negative pole is connected with the positive pole of the 4th diode (304); The negative pole of the 4th diode (304) is connected with first output (OUT1) of described rectification module (120);
Described positive half cycle feed leg also comprises the first electric capacity (307) and the 4th electric capacity (310), and wherein, one end of the first electric capacity (307) is connected with the positive pole of the 4th diode (304), and the other end is connected with the first feeder ear (IN1); One end of the 4th electric capacity (310) connects the second feeder ear (IN2), and the other end connects second output (OUT2) of described rectification module (120);
Described negative half period feed leg also comprises the second electric capacity (308) and the 3rd electric capacity (309), and wherein, one end of the second electric capacity (308) connects the first feeder ear (IN1), and the other end connects second output (OUT2) of described rectification module (120); One end of the 3rd electric capacity (309) connects the positive pole of the first diode (301), and the other end connects the second feeder ear (IN2);
Described switch module is made up of voltage sample unit and the multiple switch elements that are connected in parallel to each other, wherein, each switch element is arranged between the output of one of them LED load and described second output (OUT2) of described rectification module (120), to carry out break-make control according to the voltage signal of described voltage sample unit.
2. LED driving circuit according to claim 1, it is characterized in that, the voltage sample unit of each switch element comprises respectively the first sampling resistor (313), the second sampling resistor (314) and the first voltage stabilizing didoe (315), wherein, described the first sampling resistor (313) and described the second sampling resistor (314) are connected to according to the mode being one another in series between first output (OUT1) and the second output (OUT2) of described rectification module (120), and described the first voltage stabilizing didoe (315) connects according to positive pole the mode that the second output (OUT2) and negative pole connect described the first sampling resistor (313) and is connected in parallel to described the second sampling resistor (314).
3. LED driving circuit according to claim 2, it is characterized in that, each switch element in described switch module comprises respectively the first resistance (316), the second resistance (318), the 3rd resistance (321), the first switching tube (317), second switch pipe (320) and the second voltage stabilizing didoe (319), wherein
One end of described the first resistance (316) is connected to described the first sampling resistor (313) and described the second sampling resistor (314) connected node place between the two, and the other end of described the first resistance (316) is connected to the grid of the first switching tube (317);
The drain electrode of described the first switching tube (317) is connected to the output of drain electrode and the corresponding LED load of second switch pipe (320) via the second resistance (318), the source electrode of described the first switching tube (317) is connected to described the second output (OUT2), and the drain electrode of described the first switching tube (317) is also connected to the grid of described second switch pipe (320) via the 3rd resistance (321); And
The source electrode of described second switch pipe (320) is connected to described the second output (OUT2), the positive pole of described the second voltage stabilizing didoe (319) connects described the second output (OUT2), and the negative pole of described the second voltage stabilizing didoe (319) connects the source electrode of described the first switching tube (317).
4. LED driving circuit according to claim 3, is characterized in that, described the first switching tube (317) and described second switch pipe (320) are MOSFET.
5. according to the LED driving circuit one of claim 1 to 4 Suo Shu, it is characterized in that, diode in described rectification module (120) is rectifier diode or Schottky diode, oppositely 2 times of the withstand voltage input voltage peak value that is at least described rectification module (120) of described rectifier diode.
6. according to the LED driving circuit one of claim 1 to 4 Suo Shu, it is characterized in that, in described rectification module (120) described first, second, third and the 4th electric capacity are polarity free capacitor, described first, second, third and the 4th electric capacity withstand voltage be at least 1.5 times of input voltage peak value of described rectification module (120), the span of described first, second, third and the 4th electric capacity in described rectification module (120) is 22nF to 330nF.
7. according to the LED driving circuit one of claim 1 to 4 Suo Shu, it is characterized in that, between first output (OUT1) of described rectification module (120) and the second output (OUT2), be connected with smoothing circuit, described smoothing circuit consists of the voltage regulation resistance (312) and the filter capacitor (311) that are one another in series.
8. LED driving circuit according to claim 7, is characterized in that, described voltage regulation resistance (312) is less than 2000 ohm.
9. LED driving circuit according to claim 7, is characterized in that, described filter capacitor (311) is for having polar capacitor or polarity free capacitor.
10. according to the LED driving circuit one of claim 1 to 4 Suo Shu, it is characterized in that, described drive circuit is with the open circuit protection unit being made up of piezo-resistance, thermistor and/or fuse.
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| CN201320833536.2U CN203596961U (en) | 2013-12-17 | 2013-12-17 | Light-emitting diode (LED) drive circuit |
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| CN201320833536.2U CN203596961U (en) | 2013-12-17 | 2013-12-17 | Light-emitting diode (LED) drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111090938A (en) * | 2019-12-16 | 2020-05-01 | 南京九芯电子科技有限公司 | OLED sub-circuit model |
| CN114143933A (en) * | 2021-11-12 | 2022-03-04 | 广东东菱电源科技有限公司 | Circuit structure for realizing no afterglow after LED lamp is turned off |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111090938A (en) * | 2019-12-16 | 2020-05-01 | 南京九芯电子科技有限公司 | OLED sub-circuit model |
| CN111090938B (en) * | 2019-12-16 | 2022-05-24 | 南京华大九天科技有限公司 | OLED sub-circuit model |
| CN114143933A (en) * | 2021-11-12 | 2022-03-04 | 广东东菱电源科技有限公司 | Circuit structure for realizing no afterglow after LED lamp is turned off |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Light emitting diode driving circuit Effective date of registration: 20181212 Granted publication date: 20140514 Pledgee: SICHUAN ENERGY INDUSTRY INVESTMENT GROUP CO.,LTD. Pledgor: SICHUAN SUNFOR LIGHT Co.,Ltd. Registration number: 2018510000135 |
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Granted publication date: 20140514 |