CN201479428U - Constant current and constant voltage LED lighting circuit - Google Patents
Constant current and constant voltage LED lighting circuit Download PDFInfo
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- CN201479428U CN201479428U CN2009202048067U CN200920204806U CN201479428U CN 201479428 U CN201479428 U CN 201479428U CN 2009202048067 U CN2009202048067 U CN 2009202048067U CN 200920204806 U CN200920204806 U CN 200920204806U CN 201479428 U CN201479428 U CN 201479428U
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Abstract
The utility model discloses a constant current and constant voltage LED lighting circuit which comprises a rectifying and wave filtering circuit (1), a voltage stabilizing circuit (2), an LED load (3) and a constant current controlling circuit (4), wherein the constant current controlling circuit (4) is connected with the voltage stabilizing circuit (2) and the LED load (3), and the constant current controlling circuit (4) comprises a constant current controlling IC (U2), an electric current sampling resistance (R11) and a power type MOSFET(Q2); and the constant current controlling IC (U2) comprises a power source positive terminal (VDD), a ground terminal (VSS), an output terminal (G) and an electric current feedback terminal (CS), wherein the power source positive terminal (VDD) obtains voltage from the voltage stabilizing circuit (2), two ends of the electric current sampling resistance (R11) are respectively connected with the ground terminal (VSS) and the electric current feedback terminal (CS), a grid electrode of the power type MOSFET(Q2) is connected with the output terminal (G), and a source electrode and a drain electrode of the power type MOSFET(Q2) are respectively connected with the electric current feedback terminal (CS) and the LED load (3). The constant current and constant voltage LED lighting circuit can be applied to the field of LED lighting.
Description
Technical field
The utility model relates to a kind of constant current constant voltage LED lighting circuit.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.In the circuit of LED light fixture, though the power consumption of LED is little, require the power supply provided must electric current, voltage keeps relative stability within the specific limits, requiring simultaneously has certain overcurrent, overvoltage protection effect to LED.The LED lighting circuit generally need be exported the 220V alternating current direct current up to 300～400V behind the process rectifying and wave-filtering; because the discreteness of the forward voltage drop of LED; causing under up to the voltage of 300～400V directly, driving LED string group also needs to use constant-current driving; inconsistent influence with the overall presure drop of eliminating every group of LED; constant current or stabilized voltage power supply are normally adopted in the power supply that solves this class load; and in power circuit, also need to add to the circuit overcurrent protection of some element under abnormal conditions in the load, this just makes this class power supply exist element many; the circuit complexity; the drawback that the consumed power ratio is big.Present led drive circuit generally all is that constant current or voltage stabilizing circuit are set separately, and the circuit that has constant current and two kinds of functions of constant voltage simultaneously is still rare.Fig. 1 is a kind of existing isolation type switching power supply voltage stabilizing circuit, so-called " isolated " is meant that the earth terminal of the both sides of transformer is independently, though it is stable that the voltage of the power output end of sort circuit can keep, but because its conducting voltage can descend after the LED long-term work at high temperature, if therefore the voltage at LED two ends remains unchanged, then its operating current can raise.So in the practical application of voltage stabilizing circuit, in use for some time, the phenomenon that the rising owing to electric current causes LED to be burnt usually can take place, reduction of service life.Fig. 2 is a kind of existing non-isolated power LED constant-current circuit, though sort circuit can guarantee the current stabilization of output, but under the situation of a plurality of load parallel connections, then can cause the inequality of electric current in each branch road to distribute, so that after a paths of LEDs burns, quicken to cause all burning of a paths of LEDs easily.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, a kind of LED lighting circuit that has constant current and two kinds of functions of constant voltage simultaneously is provided, this constant current constant voltage LED lighting circuit is simple in structure, efficient is high, low in energy consumption, energy-conservation, can prolong the useful life of LED load.
The technical scheme that the utility model adopted is: the utility model comprises current rectifying and wave filtering circuit, voltage stabilizing circuit, the LED load, alternating current becomes the described LED load of flowing through behind the direct current of constant voltage through described voltage stabilizing circuit voltage stabilizing again after described current rectifying and wave filtering circuit rectification and filtering become direct current, described constant current constant voltage LED lighting circuit also comprises constant-current control circuit, described constant-current control circuit is connected with described voltage stabilizing circuit and described LED load, described constant-current control circuit comprises the constant current control IC, current sampling resistor, power-type MOSFET, described constant current control IC comprises power positive end, earth terminal, output, current feedback terminal, described power positive end obtains voltage from described voltage stabilizing circuit, the two ends of described current sampling resistor respectively with described earth terminal, described current feedback terminal is connected, the grid of described power-type MOSFET is connected with described output, the source electrode of described power-type MOSFET, drain electrode is connected with described current feedback terminal and described LED load respectively.
Described constant current control IC comprises generating circuit from reference voltage and at least one output comparator, described generating circuit from reference voltage comprises reference comparator, first triode, second triode, first resistance, second resistance, the 3rd resistance, the base stage of described first triode and described second triode all with the output of described reference comparator, the in-phase input end of described output comparator is connected and constitutes the reference voltage sampling point, the collector electrode of described first triode and described second triode all is connected with described power positive end, the emitter of described first triode is connected with described earth terminal by described the 3rd resistance, the emitter of described second triode is by described first resistance, described second resistance is in series and is connected with described earth terminal, the in-phase input end of described reference comparator and described first resistance, the dividing point of described second resistance is connected, the inverting input of described reference comparator is connected with the emitter of described first triode, the output of described output comparator, inverting input respectively with the described output of described constant current control IC, described current feedback terminal is connected.
Described LED load comprises at least one group of several LED that are in series.
Every group of described LED all is in series with a described constant-current control circuit, and after the series connection some groups in parallel again is connected with described voltage stabilizing circuit.
Perhaps, each is organized to remake after the described LED parallel connection and as a wholely is in series with a described constant-current control circuit, and is connected with described voltage stabilizing circuit.
Further, described constant current control IC comprises several output comparators, and several described output comparators are in parallel and in-phase input end all is connected with described reference voltage sampling point.
Described LED load comprises some groups of several LED that are in series, and described constant current control IC comprises the output and the current feedback terminal of some groups of parallel connections, and each is in series every group of described output and current feedback terminal with one group of described LED.
Described voltage stabilizing circuit is a Switching Power Supply, and described voltage stabilizing circuit comprises circuit of power factor correction.
Described constant current constant voltage LED lighting circuit also comprises the EMI circuit, and described EMI circuit is connected between the input and described current rectifying and wave filtering circuit of AC power, and described current rectifying and wave filtering circuit adopts bridge rectifier.
Described constant current constant voltage LED lighting circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit is connected between the input and described EMI circuit of AC power.
The beneficial effects of the utility model are: because the utility model comprises current rectifying and wave filtering circuit; voltage stabilizing circuit; the LED load; constant-current control circuit; alternating current becomes the described LED load of flowing through behind the direct current of constant voltage through described voltage stabilizing circuit voltage stabilizing again after described current rectifying and wave filtering circuit rectification and filtering become direct current; described constant-current control circuit is connected with described voltage stabilizing circuit and described LED load; described constant-current control circuit comprises the constant current control IC; current sampling resistor; power-type MOSFET; described constant current control IC comprises power positive end; earth terminal; output; current feedback terminal; described power positive end obtains voltage from described voltage stabilizing circuit; the two ends of described current sampling resistor respectively with described earth terminal; described current feedback terminal is connected; the grid of described power-type MOSFET is connected with described output; the source electrode of described power-type MOSFET; drain electrode is connected with described current feedback terminal and described LED load respectively; by described current rectifying and wave filtering circuit; described voltage stabilizing circuit obtains stable voltage output; even described LED load at high temperature works long hours; when the electric current desire of described LED load changes; described constant current control IC can stop electric current to change; prolong the useful life of LED load; avoid burning; described constant current control IC is as an independent devices; convenient peripheral constant voltage and the current stabilization circuit of replacing existing other circuit; make circuit element significantly reduce; circuit is simple; so the utility model has constant current and two kinds of functions of constant voltage simultaneously; this constant current constant voltage LED lighting circuit is simple in structure; the efficient height; low in energy consumption; energy-conservation; can prolong the useful life of LED load; and have the over-current over-voltage protection function, be applied to save in the LED illuminating circuit power consumption of entire circuit.
Description of drawings
Fig. 1 is a kind of schematic diagram of existing isolation type switching power supply voltage stabilizing circuit;
Fig. 2 is a kind of schematic diagram of existing non-isolated power LED constant-current circuit;
Fig. 3 is the circuit diagram of the utility model embodiment one;
Fig. 4 is the internal circuit schematic diagram of the constant current control IC of the utility model embodiment one;
Fig. 5 is the circuit diagram of the utility model embodiment two;
Fig. 6 is the circuit diagram of the utility model embodiment three;
Fig. 7 is the circuit diagram of the utility model embodiment four;
Fig. 8 is the internal circuit schematic diagram of the constant current control IC of the utility model embodiment four.
Embodiment
Embodiment one:
As shown in Figure 3, Figure 4, present embodiment is a kind of non-isolated constant current constant voltage LED lighting circuit, comprise current rectifying and wave filtering circuit 1, voltage stabilizing circuit 2, LED load 3, constant-current control circuit 4, EMI circuit 5, short-circuit protection circuit 6, alternating current become the described LED load 3 of flowing through behind the direct current of constant voltage through described voltage stabilizing circuit 2 voltage stabilizings again after described current rectifying and wave filtering circuit 1 rectification and filtering become direct current; Described current rectifying and wave filtering circuit 1 adopts bridge rectifier, comprises rectifier bridge D1, filter capacitor C5; Described EMI circuit 5 comprises transformer T1 and four capacitor C 1, C2, C3, C4, is connected between the input and described current rectifying and wave filtering circuit 1 of AC power; Described short-circuit protection circuit 6 comprises fuse F1, is used for overcurrent and short-circuit protection, is connected between the input and described EMI circuit 5 of AC power; Described voltage stabilizing circuit 2 is Switching Power Supplies, described voltage stabilizing circuit 2 comprises circuit of power factor correction U1, the model that described circuit of power factor correction U1 adopts ST company to produce is the power supply PFC power factor control circuit of L6561, it has, and circuit is simple, the efficient advantages of higher, be widely used at present in the power circuit of required power factor correctings such as electricity-saving lamp, its peripheral cell comprises five capacitor C 6～C10, ten resistance R 1～R10, two diode D2, D3, a metal-oxide-semiconductor Q1, voltage-stabiliser tube Z1, a transformer T2; Described constant-current control circuit 4 is connected with described voltage stabilizing circuit 2 and described LED load 3, described constant-current control circuit 4 comprises constant current control IC U2, current sampling resistor R11, power-type MOSFET Q2, described constant current control IC U2 comprises power positive end VDD, earth terminal VSS, output G, current feedback terminal CS, described power positive end VDD obtains voltage from described voltage stabilizing circuit 2, the two ends of described current sampling resistor R11 respectively with described earth terminal VSS, described current feedback terminal CS is connected, the grid of described power-type MOSFET Q2 is connected with described output G, the source electrode of described power-type MOSFET Q2, drain electrode is connected with described current feedback terminal CS and described LED load 3 respectively; Described constant current control IC U2 comprises generating circuit from reference voltage and an output comparator OP1, described generating circuit from reference voltage comprises reference comparator OP0, the first triode Q10, the second triode Q20, first resistance R 21, second resistance R 22, the 3rd resistance R 23, the base stage of described first triode Q10 and the described second triode Q20 all with the output of described reference comparator OP0, the in-phase input end of described output comparator OP1 is connected and constitutes reference voltage sampling point Vref, the collector electrode of described first triode Q10 and the described second triode Q20 all is connected with described power positive end VDD, the emitter of the described first triode Q10 is connected with described earth terminal VSS by described the 3rd resistance R 23, the emitter of the described second triode Q20 is by described first resistance R 21, described second resistance R 22 is in series and is connected with described earth terminal VSS, the in-phase input end of described reference comparator OP0 and described first resistance R 21, the dividing point of described second resistance R 22 is connected, the inverting input of described reference comparator OP0 is connected with the emitter of the described first triode Q10, the output of described output comparator OP1, inverting input respectively with the described output G of described constant current control IC U2, described current feedback terminal CS is connected, described power positive end VDD obtains the operating voltage that is fit to described constant current control IC U2 from described voltage stabilizing circuit 2, the output of described output comparator OP1 directly drives the grid of described power-type MOSFET Q2, the electric current that flows through described current sampling resistor R11 produces the inverting input of a Voltage Feedback to described output comparator OP1, control the output of described output comparator OP1, thereby make current stabilization by described power-type MOSFET Q2 at following value: Vref/R11, this value is the constant current value of design; Described LED load 3 comprises the one group of N that is in series LED, and each described LED and a described constant-current control circuit 4 are in series, and is connected with described voltage stabilizing circuit 2 after the series connection, to constitute the loop again.
The utility model is by described current rectifying and wave filtering circuit 1; described voltage stabilizing circuit 2 obtains stable voltage output; even described LED load 3 at high temperature works long hours; when the electric current desire of described LED load 3 changes; described constant current control IC U2 can stop electric current to change; prolong the useful life of LED load; avoid burning; described constant current control IC U2 is as an independent devices; convenient peripheral constant voltage and the current stabilization circuit of replacing existing other circuit; make circuit element significantly reduce; circuit is simple; can prolong the useful life of LED load; therefore; the utility model can provide the output of voltage and current stabilization simultaneously to load; especially suitable for demanding LED load in useful life; this constant current constant voltage LED lighting circuit efficient height; low in energy consumption; energy-conservation and have the over-current over-voltage protection function, be applied to can save in the LED lighting circuit power consumption of entire circuit.
Embodiment two:
As shown in Figure 5, the difference of present embodiment and embodiment one is: the described LED load 3 of present embodiment comprises M group LED, every group has N LED to be in series, be in parallel between the M group, each is organized to remake after the described LED parallel connection and as a wholely is in series with a described constant-current control circuit 4, and is connected to form the loop with described voltage stabilizing circuit 2.Present embodiment can only be controlled and respectively organize electric current whole after the described LED parallel connection.
All the other features of present embodiment are with embodiment one.
Embodiment three:
As shown in Figure 6, the difference of present embodiment and embodiment one is: the described load 3 of present embodiment comprises two groups of several LED that are in series, every group has N LED, every group of described LED all is in series with a described constant-current control circuit 4, after the series connection two groups in parallel again is connected to form the loop with described voltage stabilizing circuit 2, therefore present embodiment has two described constant current control IC U2, U3 and current sampling resistor R11, R12, power-type MOSFET Q2, Q3.Certainly, described load 3 is not limited to two groups, also can be many groups.Present embodiment can be controlled the electric current of the described LED of place group separately separately by several described constant-current control circuits 4.
All the other features of present embodiment are with embodiment one.
Embodiment four:
As Fig. 7, shown in Figure 8, the difference of present embodiment and embodiment one is: the described LED load 3 of present embodiment comprises four groups of LED that are in series, every group has N LED, described constant current control IC U2 comprises four output comparator OP1, OP2, OP3, OP4, four described output comparator OP1, OP2, OP3, OP4 is in parallel and in-phase input end all is connected with described reference voltage sampling point Vref, described constant current control IC U2 comprises the output G1 of four groups of parallel connections, G2, G3, G4 and current feedback terminal CS1, CS2, CS3, CS4, every group of described output G1, G2, G3, G4 and current feedback terminal CS1, CS2, CS3, CS4 is in series each with one group of described LED, simultaneously, described current sampling resistor, the quantity of described power-type MOSFET is consistent with the quantity of described output comparator.Present embodiment just can independently be controlled the electric current of respectively organizing described LED by a described constant-current control circuit 4.
All the other features of present embodiment are with embodiment one.
The utility model can be widely used in the LED lighting field.
Claims (10)
1. constant current constant voltage LED lighting circuit, comprise current rectifying and wave filtering circuit (1), voltage stabilizing circuit (2), LED load (3), alternating current passes through the described LED load (3) of flowing through behind the direct current that described voltage stabilizing circuit (2) voltage stabilizing becomes constant voltage again after (1) rectification of described current rectifying and wave filtering circuit and filtering become direct current, it is characterized in that: described constant current constant voltage LED lighting circuit also comprises constant-current control circuit (4), described constant-current control circuit (4) is connected with described voltage stabilizing circuit (2) and described LED load (3), described constant-current control circuit (4) comprises constant current control IC (U2), current sampling resistor (R11), power-type MOSFET (Q2), described constant current control IC (U2) comprises power positive end (VDD), earth terminal (VSS), output (G), current feedback terminal (CS), described power positive end (VDD) obtains voltage from described voltage stabilizing circuit (2), the two ends of described current sampling resistor (R11) respectively with described earth terminal (VSS), described current feedback terminal (CS) is connected, the grid of described power-type MOSFET (Q2) is connected with described output (G), the source electrode of described power-type MOSFET (Q2), drain electrode is connected with described current feedback terminal (CS) and described LED load (3) respectively.
2. LED light fixture energy-saving control circuit according to claim 1, it is characterized in that: described constant current control IC (U2) comprises generating circuit from reference voltage and at least one output comparator (OP1), described generating circuit from reference voltage comprises reference comparator (OP0), first triode (Q10), second triode (Q20), first resistance (R21), second resistance (R22), the 3rd resistance (R23), the base stage of described first triode (Q10) and described second triode (Q20) all with the output of described reference comparator (OP0), the in-phase input end of described output comparator (OP1) is connected and constitutes reference voltage sampling point (Vref), the collector electrode of described first triode (Q10) and described second triode (Q20) all is connected with described power positive end (VDD), the emitter of described first triode (Q10) is connected with described earth terminal (VSS) by described the 3rd resistance (R23), the emitter of described second triode (Q20) is by described first resistance (R21), described second resistance (R22) is in series and is connected with described earth terminal (VSS), the in-phase input end of described reference comparator (OP0) and described first resistance (R21), the dividing point of described second resistance (R22) is connected, the inverting input of described reference comparator (OP0) is connected with the emitter of described first triode (Q10), the output of described output comparator (OP1), inverting input respectively with the described output (G) of described constant current control IC (U2), described current feedback terminal (CS) is connected.
3. LED light fixture energy-saving control circuit according to claim 1 and 2 is characterized in that: described LED load (3) comprises at least one group of several LED that are in series.
4. constant current constant voltage LED lighting circuit according to claim 3 is characterized in that: every group of described LED all is in series with a described constant-current control circuit (4), and after the series connection some groups in parallel again is connected with described voltage stabilizing circuit (2).
5. constant current constant voltage LED lighting circuit according to claim 3 is characterized in that: each is organized to remake after the described LED parallel connection and as a wholely is in series with a described constant-current control circuit (4), and is connected with described voltage stabilizing circuit (2).
6. LED light fixture energy-saving control circuit according to claim 2, it is characterized in that: described constant current control IC (U2) comprises several output comparators (OP1, OP2, OP3, OP4), and several described output comparators (OP1, OP2, OP3, OP4) are in parallel and in-phase input end all is connected with described reference voltage sampling point (Vref).
7. constant current constant voltage LED lighting circuit according to claim 6, it is characterized in that: described LED load (3) comprises some groups of several LED that are in series, described constant current control IC (U2) comprises the output (G1, G2, G3, G4) and the current feedback terminal (CS1, CS2, CS3, CS4) of some groups of parallel connections, and each is in series every group of described output (G1, G2, G3, G4) and current feedback terminal (CS1, CS2, CS3, CS4) with one group of described LED.
8. constant current constant voltage LED lighting circuit according to claim 1 and 2 is characterized in that: described voltage stabilizing circuit (2) is a Switching Power Supply, and described voltage stabilizing circuit (2) comprises circuit of power factor correction.
9. constant current constant voltage LED lighting circuit according to claim 1 and 2, it is characterized in that: described constant current constant voltage LED lighting circuit also comprises EMI circuit (5), described EMI circuit (5) is connected between the input and described current rectifying and wave filtering circuit (1) of AC power, and described current rectifying and wave filtering circuit (1) adopts bridge rectifier.
10. constant current constant voltage LED lighting circuit according to claim 9; it is characterized in that: described constant current constant voltage LED lighting circuit also comprises short-circuit protection circuit (6), and described short-circuit protection circuit (6) is connected between the input and described EMI circuit (5) of AC power.
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| CN2009202048067U CN201479428U (en) | 2009-09-07 | 2009-09-07 | Constant current and constant voltage LED lighting circuit |
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| CN2009202048067U CN201479428U (en) | 2009-09-07 | 2009-09-07 | Constant current and constant voltage LED lighting circuit |
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| CN101917792A (en) * | 2010-07-30 | 2010-12-15 | 深圳市桑达实业股份有限公司 | Constant current source, power circuit and illuminating system |
| CN101925216A (en) * | 2010-07-23 | 2010-12-22 | 中山市威禾电器制造有限公司 | LED street lamp |
| CN102045927A (en) * | 2010-12-06 | 2011-05-04 | 上海正龙实业有限公司 | LED (light-emitting diode) power supply |
| CN102209413A (en) * | 2010-08-16 | 2011-10-05 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and LED (light-emitting diode) lamp drive circuit |
| WO2012022088A1 (en) * | 2010-08-16 | 2012-02-23 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and led lamp driving circuit |
| CN102591386A (en) * | 2012-02-24 | 2012-07-18 | 辽宁省电力有限公司抚顺供电公司 | Full-automatic single-phase voltage stabilized power supply device |
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| CN103052203A (en) * | 2011-10-14 | 2013-04-17 | 欧司朗股份有限公司 | LED (Light Emitting Diode) control circuit and control method thereof |
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| CN102209413A (en) * | 2010-08-16 | 2011-10-05 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and LED (light-emitting diode) lamp drive circuit |
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| CN102958246B (en) * | 2011-08-11 | 2017-03-01 | 半导体元件工业有限责任公司 | The control circuit of light-emitting component |
| CN102958246A (en) * | 2011-08-11 | 2013-03-06 | 半导体元件工业有限责任公司 | Light-emitting device control circuit |
| CN103052203B (en) * | 2011-10-14 | 2015-06-24 | 欧司朗股份有限公司 | LED (Light Emitting Diode) control circuit and control method thereof |
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| CN102591386A (en) * | 2012-02-24 | 2012-07-18 | 辽宁省电力有限公司抚顺供电公司 | Full-automatic single-phase voltage stabilized power supply device |
| CN102904427B (en) * | 2012-09-27 | 2015-02-11 | 成都芯源系统有限公司 | Power supply system and method for inhibiting ripple current thereof |
| CN102904427A (en) * | 2012-09-27 | 2013-01-30 | 成都芯源系统有限公司 | Power supply system and method for inhibiting ripple current thereof |
| CN103346681A (en) * | 2013-06-13 | 2013-10-09 | 重庆雷士实业有限公司 | LED lighting device and anti-explosion power supply thereof |
| CN103346681B (en) * | 2013-06-13 | 2016-08-03 | 雷士照明（中国）有限公司 | LED light device and explosion-proof electrical source thereof |
| CN104093252A (en) * | 2014-07-16 | 2014-10-08 | 浙江大学 | Non-strobe non-isolated LED constant-current driving circuit |
| CN106793311A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | The LED Intelligent constant flow constant-voltage driving power sources of tunable optical |
| CN109152134A (en) * | 2018-08-17 | 2019-01-04 | 思力科（深圳）电子科技有限公司 | Multichannel dimming drive system |
| CN109152134B (en) * | 2018-08-17 | 2021-01-22 | 思力科（深圳）电子科技有限公司 | Multi-path dimming driving system |
| CN109360526A (en) * | 2018-11-16 | 2019-02-19 | 上海得倍电子技术有限公司 | A kind of LED high-efficiency constant-current control device |
| CN109360526B (en) * | 2018-11-16 | 2023-11-28 | 上海得倍电子技术有限公司 | LED high efficiency constant current control device |
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