CN204408717U - Long LED lamp bead string constant-flow driver - Google Patents
Long LED lamp bead string constant-flow driver Download PDFInfo
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- CN204408717U CN204408717U CN201520131860.9U CN201520131860U CN204408717U CN 204408717 U CN204408717 U CN 204408717U CN 201520131860 U CN201520131860 U CN 201520131860U CN 204408717 U CN204408717 U CN 204408717U
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Abstract
The utility model relates to a kind of circuit arrangement for controlling general electric light source, be specifically related to a kind of long LED lamp bead string constant-flow driver, comprise the EMI filter circuit connected in turn, rectification circuit and Boost circuit, Boost circuit comprises Switching Power Supply control chip and peripheral circuit, between the drain electrode of Switching Power Supply control chip and rectification circuit anode, boost inductance is set, source electrode connects rectification circuit negative pole, Switching Power Supply control chip leaks, isolating diode in sequential series and filter capacitor are set between source electrode, filter capacitor is in parallel with LED lamp bead string in sequential series and current regulator diode, Switching Power Supply control chip controls connection control electric capacity between pole and source electrode, control capacitance current regulator diode in parallel.The utility model adopts Boost circuit, boosts to the Rectified alternating current after rectification, meets more than hundred LED lamp bead strings and drives demand, and realizes generation, the control of lamp pearl string constant current and keep.
Description
Technical field
The utility model relates to a kind of circuit arrangement for controlling general electric light source, is specifically related to a kind of long LED lamp bead string constant-flow driver.
Background technology
LED (Light-Emitting Diode) is light-emitting component of new generation, and because luminous efficiency is high, LED illumination receives heat and holds in both hands, and various forms of LED drive circuit arises at the historic moment.Due to the restriction by monomer power, LED illumination utensil needs the luminescence simultaneously of many LED lamp bead just can meet the demands usually.In order to the alternating current voltage adapting to 85 general ~ 265V is powered, the connected mode that current LED lamp bead is in parallel after mostly adopting first series connection, often a string LED lamp bead quantity is not usually higher than 30.For ensureing the LED energy normal luminous when fluctuation occurs voltage, LED drive circuit adopts BUCK reduction voltage circuit mostly.The forward voltage drop of LED lamp bead has negative temperature coefficient feature, and namely die temperature is higher, and forward voltage drop is lower.LED lamp bead string in parallel, each string both end voltage is identical, if certain LED lamp bead occurs abnormal in wherein a string, pressure drop is on the low side, certainly will cause other lamp pearl dividing potential drop overrate with string.According to the Voltammetric Relation characteristic of LED lamp bead, must cause the increase of lamp pearl electric current, this can increase the weight of again the further rising of die temperature, makes the pressure drop of lamp pearl lower.The result that vicious circle like this causes is that the brightness of a certain cluster of lamps, ornamental pearl is higher, and all the other several string luminance shortage, illuminating effect is affected, and time serious, fault cluster of lamps, ornamental pearl can be burnt.
According to the characteristic of LED, the best way of many LED lamp bead connections is series connection, adopts constant current to drive.For the T8 fluorescent lamp of 12W, approximately need the lamp pearl of about 110 ~ 140 luminescence simultaneously just can meet the demands.The lamp pearl series connection of quantity like this, the driving voltage needed is approximately 450V, just having there are two difficult problems in this: even if one is that so high direct voltage adopts common rectification circuit also cannot obtain under high input voltage (exchanging 265V), can not obtain especially at the lower terminal voltage (exchanging 85V) of common voltage; Two is disconnect based on series circuit the characteristic namely lost efficacy, and how the lamp pearl series connection of quantity like this, ensure reliability.
Utility model content
For solving the deficiency in above-mentioned technology, the purpose of this utility model is: provide a kind of long LED lamp bead string constant-flow driver, adopt Boost circuit, Rectified alternating current after rectification is boosted, meet more than hundred LED lamp bead strings and drive demand, and realize generation, the control of lamp pearl string constant current and keep.
For solving its technical problem, technical solution adopted in the utility model is:
Described long LED lamp bead string constant-flow driver, comprise EMI filter circuit, rectification circuit and Boost circuit, EMI filter circuit input connects power supply, output connects rectification circuit, rectification circuit output end connects Boost circuit, described Boost circuit comprises Switching Power Supply control chip and peripheral circuit, between the drain electrode of Switching Power Supply control chip and rectification circuit anode, boost inductance is set, Switching Power Supply control chip source electrode connects rectification circuit negative pole, between the drain electrode of Switching Power Supply control chip and source electrode, isolating diode I in sequential series and filter capacitor are set, filter capacitor is in parallel with LED lamp bead string in sequential series and current regulator diode, Switching Power Supply control chip controls connection control electric capacity between pole and source electrode, the isolating diode II that control capacitance parallel connection is connected in series in turn, current-limiting resistance and current regulator diode.
After the utility model connects AC power, first through high-frequency interferencing signal filtering that EMI filter circuit will be superimposed upon industrial-frequency alternating current and presses, industrial-frequency alternating current becomes the direct current of pulsation after being rectified circuit rectifies, first Rectified alternating current passes through boost inductance, the drain electrode of Switching Power Supply control chip and its internal circuit are charged to control capacitance, when the voltage at control capacitance two ends reaches 5.7V, the internal oscillator of Switching Power Supply control chip is started working, the high-power switch tube conducting of Switching Power Supply control chip inside, drain electrode and source shorted, boost inductance is charged.Meanwhile, control capacitance starts electric discharge, and when the voltage at control capacitance two ends is lower than 4.7V, the high-power switch tube of Switching Power Supply control chip inside is closed, and boost inductance is discharged by isolating diode I, and filter capacitor is charged, and output voltage is set up.After boost inductance electric discharge terminates, again repeat said process.
Because LED lamp bead string and current regulator diode are series relationship, the total voltage at its two ends is exactly the output voltage of booster circuit, the voltage at current regulator diode two ends reflects the height of output voltage, this voltage is as the feedback signal of output voltage, a kind of association can be set up, namely Switching Power Supply control chip can adjust output voltage in time according to the size of feedback signal, ensures the voltages keep constant at current regulator diode two ends.It is no matter the fluctuation of AC supply voltage, or the change of the single lamp pearl pressure drop that the change of LED lamp bead die temperature causes, the voltage of capital to current regulator diode two ends has an impact, but by above-mentioned adjustment, the voltage at current regulator diode two ends is limited in scope substantially, and the amplitude of change is very little, current regulator diode always works in the substantially invariable state of dissipation power, namely both end voltage is substantially constant, the current constant flow through, and this is significant to raising overall efficiency.
Wherein, preferred version is:
Described LED lamp bead string comprises a 110-140 in sequential series LED lamp bead.
Described Switching Power Supply control chip adopts TOPSwitch-II family chip; such as TOP221, TOP222, TOP223, TOP224, TOP225, TOP226 or TOP227; this type of chip periphery circuit is very simple; peripheral cell number is few; but on-chip circuit function is very abundant; especially controlling functions and defencive function are very complete, and the power output of chip is mated substantially with the power needed for LED daylight lamp.The more important thing is, chip internal is from having start-up circuit and power supply circuits, and outside does not need to arrange independent circuit, simplifies circuit to greatest extent, no longer needs the parts using transformer equal-volume larger in circuit.If use other chip, needing a transformer, is chip power supply with the auxiliary winding of transformer, save isolating transformer, not only can reduce costs, and reduce height and the volume of drive unit widely, the lamp bracket that angle of scattering is larger can be used, make illuminating effect better.
Described filter capacitor adopts MLCC electric capacity, and SMD encapsulates, and is withstand voltagely not less than 630V.
Described control capacitance adopts tantalum electric capacity, and SMD encapsulates, and is withstand voltagely not less than 16V.
Described rectification circuit adopts full-wave rectification bridge, and alternating current is become direct current, and owing to not adopting big capacity electrolyte capacitor filtering, the output voltage of rectifier bridge is the direct current of pulsation.
Described boost inductance adopts the shielding inductance of band magnetic cover, can reduce power consumption, and reduce electromagnetic radiation, compared with common I-shaped inductance, the magnetic circuit of this inductance is almost closed, can effectively reduce external radiation level like this; In addition, coil turn is few, and D.C. resistance is little, and Q value is high, and power consumption is lower.
Described isolating diode I and isolating diode II adopt fast recovery diode, are withstand voltagely not less than 1000V.
Described EMI filter circuit comprises electric capacity and inductance, has double action, and one is effectively to stop the High-frequency Interference from AC network to enter this circuit, and two is that the High-frequency Interference effectively preventing this circuit from producing pollutes electrical network.
Compared with prior art, the utility model has following beneficial effect:
The utility model adopts Boost circuit, boosts to the Rectified alternating current after rectification, meets more than hundred LED lamp bead strings and drives demand, and realizes generation, the control of lamp pearl string constant current and keep.In the input access EMI filter circuit of power supply, can effectively stop the High-frequency Interference from AC network to enter this circuit on the one hand, the High-frequency Interference effectively preventing this circuit from producing on the other hand pollutes electrical network; Adopt Boost circuit, not only expand the voltage scope of application, and improve power factor; Use band magnetic cover shielding inductance, reduce interference, reduce power consumption, efficiency is improved; Select the advanced serial control chip of TOPSwitch-II, controlling functions enriches, and defencive function is complete; Do not use alminium electrolytic condenser, be equivalent to eliminate the short slab affecting whole circuit lifetime; Element in main circuit is all operated on off state or low power consumpting state, and complete machine is dispelled the heat, without the need to arranging special radiator by the copper film area of printed board; All elements all adopt veneer to install, highly low, take up room little, can adopt the lamp bracket of larger astigmatism angle, improve illuminating effect; Control flexibly, can need to change external LED number according to power, circuit, without the need to variation, if need to change output current, then can adopt two current regulator diode parallel connections, change control chip simultaneously; LED lamp bead is connected in series, and brightness is consistent; Whole number of circuit elements is few, and printed board can adopt single sided board, and due to the obvious element of nothing heating, printed board area reduces, and cost reduces.
Accompanying drawing explanation
Fig. 1 the utility model embodiment 1 electrical block diagram.
In figure: 1, EMI filter circuit; 2, rectification circuit; 3, Boost circuit; 4, Switching Power Supply control chip; 5, boost inductance; 6, isolating diode I; 7, filter capacitor; 8, LED lamp bead string; 9, current regulator diode; 10, control capacitance; 11, isolating diode II; 12, current-limiting resistance.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
Embodiment 1:
As shown in Figure 1, long LED lamp bead string constant-flow driver described in the utility model, comprise EMI filter circuit 1, rectification circuit 2 and Boost circuit 3, EMI filter circuit 1 input connects power supply, output connects rectification circuit 2, rectification circuit 2 output connects Boost circuit 3, described Boost circuit 3 comprises Switching Power Supply control chip 4 and peripheral circuit, Switching Power Supply control chip 4 drains and arranges boost inductance 5 between rectification circuit 2 positive pole, Switching Power Supply control chip 4 source electrode connects rectification circuit 2 negative pole, Switching Power Supply control chip 4 drains and arranges isolating diode I6 in sequential series and filter capacitor 7 between source electrode, filter capacitor 7 is in parallel with LED lamp bead string 8 in sequential series and current regulator diode 9, Switching Power Supply control chip 4 controls connection control electric capacity 10 between pole and source electrode, the isolating diode II 11 that control capacitance 10 parallel connection is connected in series in turn, current-limiting resistance 12 and current regulator diode 9.
Wherein, LED lamp bead string 8 comprises a 110-140 in sequential series LED lamp bead, Switching Power Supply control chip 4 adopts TOPSwitch-II family chip, such as TOP221, TOP222, TOP223, TOP224, TOP225, TOP226 or TOP227, this type of chip periphery circuit is very simple, peripheral cell number is few, but on-chip circuit function is very abundant, especially controlling functions and defencive function are very complete, the power output of chip is mated substantially with the power needed for LED daylight lamp, the more important thing is, chip internal is from having start-up circuit and power supply circuits, outside does not need to arrange independent circuit, simplify circuit to greatest extent, no longer need the parts using transformer equal-volume larger in circuit, if use other chip, need a transformer, be chip power supply with the auxiliary winding of transformer, save isolating transformer, not only can reduce costs, and reduce height and the volume of drive unit widely, the lamp bracket that angle of scattering is larger can be used, make illuminating effect better, filter capacitor 7 adopts MLCC electric capacity, and SMD encapsulates, and is withstand voltagely not less than 630V, control capacitance 10 adopts tantalum electric capacity, and SMD encapsulates, and is withstand voltagely not less than 16V, rectification circuit 2 adopts full-wave rectification bridge, and alternating current is become direct current, and owing to not adopting big capacity electrolyte capacitor filtering, the output voltage of rectifier bridge is the direct current of pulsation, boost inductance 5 adopts the shielding inductance of band magnetic cover, can reduce power consumption, and reduce electromagnetic radiation, compared with common I-shaped inductance, the magnetic circuit of this inductance is almost closed, can effectively reduce external radiation level like this, in addition, coil turn is few, and D.C. resistance is little, and Q value is high, and power consumption is lower, isolating diode I6 and isolating diode II 11 adopts fast recovery diode, is withstand voltagely not less than 1000V, EMI filter circuit comprises electric capacity and inductance, has double action, and one is effectively to stop the High-frequency Interference from AC network to enter this circuit, and two is that the High-frequency Interference effectively preventing this circuit from producing pollutes electrical network.
After the utility model connects AC power, first through high-frequency interferencing signal filtering that EMI filter circuit 1 will be superimposed upon industrial-frequency alternating current and presses, industrial-frequency alternating current becomes the direct current of pulsation after being rectified circuit 2 rectification, Rectified alternating current is first by boost inductance 5, Switching Power Supply control chip 4 drains and its internal circuit is charged to control capacitance 10, when the voltage at control capacitance 10 two ends reaches 5.7V, the internal oscillator of Switching Power Supply control chip 4 is started working, the high-power switch tube conducting of Switching Power Supply control chip 4 inside, drain electrode and source shorted, boost inductance 5 is charged.Meanwhile, control capacitance 10 starts electric discharge, when the voltage at control capacitance 10 two ends is lower than 4.7V, the high-power switch tube of Switching Power Supply control chip 4 inside is closed, boost inductance 5 is discharged by isolating diode I6, and filter capacitor 7 is charged, and output voltage is set up.After boost inductance 5 electric discharge terminates, again repeat said process.
Because LED lamp bead string 8 and current regulator diode 9 are series relationship, the total voltage at its two ends is exactly the output voltage of booster circuit, the voltage at current regulator diode 9 two ends reflects the height of output voltage, this voltage is as the feedback signal of output voltage, a kind of association can be set up, namely Switching Power Supply control chip 4 can adjust output voltage in time according to the size of feedback signal, ensures the voltages keep constant at current regulator diode 9 two ends.It is no matter the fluctuation of AC supply voltage, or the change of the single lamp pearl pressure drop that the change of LED lamp bead die temperature causes, the voltage of capital to current regulator diode 9 two ends has an impact, but by above-mentioned adjustment, the voltage at current regulator diode 99 two ends is limited in scope substantially, and the amplitude of change is very little, current regulator diode 9 always works in the substantially invariable state of dissipation power, namely both end voltage is substantially constant, the current constant flow through, and this is significant to raising overall efficiency.
Claims (8)
1. one kind long LED lamp bead string constant-flow driver, comprise EMI filter circuit (1), rectification circuit (2) and Boost circuit (3), EMI filter circuit (1) input connects power supply, output connects rectification circuit (2), rectification circuit (2) output connects Boost circuit (3), it is characterized in that, described Boost circuit (3) comprises Switching Power Supply control chip (4) and peripheral circuit, between Switching Power Supply control chip (4) drain electrode and rectification circuit (2) positive pole, boost inductance (5) is set, Switching Power Supply control chip (4) source electrode connects rectification circuit (2) negative pole, between Switching Power Supply control chip (4) drain electrode and source electrode, isolating diode I (6) in sequential series and filter capacitor (7) are set, filter capacitor (7) is in parallel with LED lamp bead string (8) in sequential series and current regulator diode (9), Switching Power Supply control chip (4) controls connection control electric capacity (10) between pole and source electrode, the isolating diode II (11) that control capacitance (10) parallel connection is connected in series in turn, current-limiting resistance (12) and current regulator diode (9).
2. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described LED lamp bead string (8) comprises a 110-140 in sequential series LED lamp bead.
3. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described Switching Power Supply control chip (4) adopts TOPSwitch-II family chip.
4. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described filter capacitor (7) adopts MLCC electric capacity, and SMD encapsulates.
5. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described control capacitance (10) adopts tantalum electric capacity, and SMD encapsulates.
6. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described rectification circuit (2) adopts full-wave rectification bridge.
7. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described boost inductance (5) adopts the shielding inductance of band magnetic cover.
8. long LED lamp bead string constant-flow driver according to claim 1, is characterized in that, described isolating diode I (6) and isolating diode II (11) adopt fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520131860.9U CN204408717U (en) | 2015-03-06 | 2015-03-06 | Long LED lamp bead string constant-flow driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520131860.9U CN204408717U (en) | 2015-03-06 | 2015-03-06 | Long LED lamp bead string constant-flow driver |
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| CN204408717U true CN204408717U (en) | 2015-06-17 |
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| CN201520131860.9U Expired - Fee Related CN204408717U (en) | 2015-03-06 | 2015-03-06 | Long LED lamp bead string constant-flow driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463022A (en) * | 2017-02-17 | 2018-08-28 | 周徐达 | A kind of multi-layer ceramic capacitance constant current driver circuit for LED |
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2015
- 2015-03-06 CN CN201520131860.9U patent/CN204408717U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463022A (en) * | 2017-02-17 | 2018-08-28 | 周徐达 | A kind of multi-layer ceramic capacitance constant current driver circuit for LED |
| CN108463022B (en) * | 2017-02-17 | 2024-05-07 | 周徐达 | Multilayer ceramic capacitor LED constant current driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20180306 |