CN204795788U - Linear constant current LED drive circuit of high pressure - Google Patents
Linear constant current LED drive circuit of high pressure Download PDFInfo
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- CN204795788U CN204795788U CN201520536034.2U CN201520536034U CN204795788U CN 204795788 U CN204795788 U CN 204795788U CN 201520536034 U CN201520536034 U CN 201520536034U CN 204795788 U CN204795788 U CN 204795788U
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Abstract
The utility model discloses a linear constant current LED drive circuit of high pressure, organize, transport including rectification filter circuit, LED load and put supply circuit, constant current control circuit and PFC regulator circuit, wherein: constant current control circuit utilizes feedback control to keep organizing the invariant of intermediate -current through the LED load, high power factor is carried to the PFC regulator circuit pressure drop through adjustment LED load group improvement arrival current's wave form, the rectification filter circuit connect respectively supply circuit, LED load group and PFC regulator circuit are put to fortune, the supply circuit connection is put to fortune constant current control circuit and the PFC regulator circuit, constant current control circuit connects LED load group, PFC adjusts circuit connection LED load group. The utility model discloses circuit structure is simple reasonable, through current feedback control and lamp pearl piggyback control, has realized the linear constant current function of high PFC, high efficiency, high flexibility.
Description
Technical field
The utility model relates to electronic circuit field, specifically a kind of high-voltage linear constant current LED drive circuit.
Background technology
Due to LED have that luminous efficiency is high, energy ezpenditure is low, the life-span is long, not mercurous and there is good dimming behavior, because being widely used in lighting of home, become the lighting source of a new generation.
The lighting system of LED lamp is different from the lighting system of conventional lamp, and it can not directly be linked in electric main electrical network, but first electric main will be converted into DC power supply by drive circuit and just can be linked in LED load.Existing LED drive circuit can be divided into switching regulator and linear constant current formula two kinds of LED drive circuits, and switching regulator driving circuit structure is complicated, therefore market starts to tend to use the linear constant current formula drive circuit being more conducive to produce in batches.
It is simple that linear constant current formula drive circuit has circuit, be convenient to volume production and the high advantage of efficiency, but, it still comes with some shortcomings, such as, existing linear constant current formula drive circuit mostly have employed high-voltage linear constant current IC chip and realizes, IC chip relative price is more expensive, its cost of manufacture correspondingly just adds, simultaneously, existing linear constant current formula drive circuit general linear regulation is poor, power factor is lower, and generally can not realize light modulation, the high-performance of LED drive circuit and multi-functional requirement can not be met, therefore there is a kind of cost to be developed lower, performance is good and have the linear constant current LED drive circuit of dimming function.
Utility model content
The purpose of this utility model is to provide a kind of structure simple, and cost is low, and performance is good and have the high-voltage linear constant current LED drive circuit of dimming function.
The technical solution of the utility model is achieved in that a kind of high-voltage linear constant current LED drive circuit, comprises current rectifying and wave filtering circuit, LED load group, amplifier power supply circuits, constant-current control circuit and PFC Circuit tuning, wherein:
Described constant-current control circuit utilizes FEEDBACK CONTROL to be maintained by the constant of electric current in LED load group;
Described amplifier power supply circuits are described constant-current control circuit, operational amplifier in PFC Circuit tuning is powered;
Described PFC Circuit tuning is apt to the waveform of input current by the pressure drop of adjustment LED load group, improves power factor;
Described current rectifying and wave filtering circuit connects described amplifier power supply circuits and LED load group, PFC Circuit tuning respectively, described amplifier power supply circuits connect described constant-current control circuit and described PFC Circuit tuning, described constant current Drive and Control Circuit connects described LED load group, and described PFC Circuit tuning connects described LED load group.
Further, described LED load group comprises multiple LED lamp bead.
Particularly, described PFC Circuit tuning comprises operational amplifier IC2, voltage reference IC4, the first sampling resistor, switching tube Q3 and Q2, and described amplifier power supply circuits connect described operational amplifier IC2 for its power supply; The plus earth of described voltage reference IC4, the normal phase input end of negative electrode concatenation operation amplifier IC2; Described first sampling resistor one end connects the voltage bus that described current rectifying and wave filtering circuit exports, other end ground connection; The inverting input of described first sampling resistor concatenation operation amplifier IC2, the output of described operational amplifier IC2 connects described triode Q3; Described triode Q3 one end ground connection, the other end connects the voltage bus of described current rectifying and wave filtering circuit output by resistance R20, R21, R22 of series connection, and the tie point of described resistance R20 and R21 connects described switching tube Q2; Described switching tube Q2 one end connects the voltage bus that described current rectifying and wave filtering circuit exports, and the other end is connected between any two the lamp pearls in multiple LED lamp bead.
Further, described constant-current control circuit comprises sampling resistor RS, switching tube Q1 and operational amplifier IC1, voltage reference IC4; Described voltage reference IC4 plus earth, the normal phase input end of negative electrode concatenation operation amplifier IC1; Described LED load group negative pole connects described power switch pipe Q1, and described power switch pipe Q1 connects sampling resistor RS, the other end ground connection of described sampling resistor RS; Described sampling resistor RS is connected to the inverting input of described operational amplifier IC1, and the output of described operational amplifier IC1 connects described switching tube Q1.
Further, described constant-current control circuit comprises the second sampling resistor, switching tube Q1, sampling resistor RS and operational amplifier IC1, described second sampling resistor comprises resistance R7, R8, R9 of series connection, described resistance R7 connects the voltage bus that described current rectifying and wave filtering circuit exports, described resistance R9 ground connection; Voltage sample on described resistance R9 is to the normal phase input end of described operational amplifier IC1; The positive pole of described LED load group connects the voltage bus of described current rectifying and wave filtering circuit output, and the negative pole of described LED load group connects one end of described switching tube Q1, and the other end of described switching tube Q1 connects sampling resistor RS, the other end ground connection of described sampling resistor RS; Described sampling resistor RS is connected to the inverting input of described operational amplifier IC1, and the output of described operational amplifier IC1 connects described switching tube Q1.
Further, described constant-current control circuit also comprises power compensating circuit, described power compensating circuit comprises operational amplifier IC3, resistance R23, resistance R24, voltage reference IC4, and described resistance R9 connects the inverting input of described operational amplifier IC3 by resistance R24; The normal phase input end of described operational amplifier IC3 is by ground connection after resistance R23 connection voltage reference IC4; The normal phase input end of operational amplifier IC3 output concatenation operation amplifier IC1.
Further, also comprise the passive leadage circuit for providing the maintenance electric current needed for controllable silicon work, described passive leadage circuit is connected with described current rectifying and wave filtering circuit.
Owing to having possessed passive leadage circuit, a kind of high-voltage linear constant current LED drive circuit of the utility model can mate with outside controllable silicon dimmer, makes it to possess light modulation effect, extends the function of LED drive circuit.
Particularly, described passive leadage circuit comprises the passive leadage circuit of the passive leadage circuit of the first order and the second level in parallel, and the passive leadage circuit of the described first order comprises resistance R1 and electric capacity CX1, and described resistance R1 connects with described electric capacity CX1; The passive leadage circuit in the described second level comprises resistance R2 and connects with described electric capacity CX2.
Compared with prior art, the utility model circuit structure advantages of simple, eliminates the IC chip of high cost, by Current Feedback Control, lamp pearl Discrete control, achieves the linear constant current function of high PFC, high efficiency and high flexibility; Can also connect controllable silicon dimmer in this circuit, passive leadage circuit provides the electric current of the maintenance needed for controllable silicon dimmer work, prevents the bad phenomenon such as emergent power saltus step, flicker in dimming process; Described power compensating circuit has input power back off function, at circuit start or when carrying out light modulation, even if input voltage alters a great deal, when particularly voltage significantly rises, the power of whole lamp is unlikely to rise cause very soon burning lamp, greatly improve the useful life of LED lamp, reduce the whole lamp cost of LED lamp.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the novel a kind of high-voltage linear constant current LED drive circuit of this use;
Fig. 2 is the circuit theory diagrams of the novel a kind of high-voltage linear constant current LED drive circuit embodiment 1 of this use;
Fig. 3 is the circuit theory diagrams of the novel a kind of high-voltage linear constant current LED drive circuit embodiment 2 of this use;
Fig. 4 is the circuit theory diagrams of the novel a kind of high-voltage linear constant current LED drive circuit embodiment 3 of this use.
Embodiment
As shown in Figure 1, a kind of high-voltage linear constant current LED drive circuit, comprises current rectifying and wave filtering circuit, LED load group, amplifier power supply circuits, constant-current control circuit, PFC Circuit tuning and passive leadage circuit, wherein:
Described constant-current control circuit utilizes FEEDBACK CONTROL to be maintained by the constant of LED load group electric current, and described LED load group comprises multiple LED lamp bead; Described amplifier power supply circuits are that the operational amplifier in described constant-current control circuit and described PFC Circuit tuning is powered; Described PFC Circuit tuning connects LED load group, is improved the waveform of input current, improve the power factor of LED drive circuit by the pressure drop of adjustment LED load group; Described current rectifying and wave filtering circuit connects described amplifier power supply circuits, LED load group and PFC Circuit tuning respectively, described amplifier power supply circuits connect described constant-current control circuit and described PFC Circuit tuning, described constant current Drive and Control Circuit connects described LED load group, and described PFC Circuit tuning connects described LED load group; Described passive leadage circuit is connected with described current rectifying and wave filtering circuit.
Embodiment 1
As shown in Figure 2, in the present embodiment, described amplifier power supply circuits comprise resistance R12, R13, R14 and the electric capacity EC1 of series connection, and described resistance R12 connects the voltage bus that current rectifying and wave filtering circuit exports, and described resistance R14 connects ground connection after described electric capacity EC1.Described PFC Circuit tuning comprises operational amplifier IC2, voltage reference IC4, the first sampling resistor, switching tube Q3 and Q2, described switching tube Q3 is triode, described switching tube Q2 is P type metal-oxide-semiconductor, and the tie point of described resistance R14 and described electric capacity EC1 to be connected with described operational amplifier IC2 by resistance R15 and to be that it is powered; The plus earth of described voltage reference IC4, negative electrode connects the normal phase input end of described operational amplifier IC2, and the normal phase input end for operational amplifier IC2 provides fixing voltage reference value, such as a 2.5V; Described first sampling resistor comprises resistance R16, R17, R18, and described resistance R16, R17, R18 series connection dividing potential drop connects, and one end of described resistance R16 connects the voltage bus of described current rectifying and wave filtering circuit output, one end ground connection of described resistance R18; The tie point of described resistance R17 and R18 connects the inverting input of described operational amplifier IC2.
Voltage compare in the voltage bus that current rectifying and wave filtering circuit exports is low, and when making current potential on resistance R18 lower than fixing voltage reference value, then described operational amplifier IC2 exports high level; The output of described operational amplifier IC2 connects the base stage of described switching tube Q3, the grounded emitter of described switching tube Q3 by resistance R19, collector electrode connects the voltage bus of described current rectifying and wave filtering circuit output by resistance R22, R21, R20; The tie point of described resistance R20 and R21 is connected to the grid of described switching tube Q2, and the source electrode of described switching tube Q2 connects the voltage bus of described current rectifying and wave filtering circuit output, and drain electrode is connected between any two the lamp pearls in multiple LED lamp bead.Because described LED load group comprises multiple LED lamp bead, when operational amplifier IC2 exports high level, described switching tube Q3 conducting, switching tube Q2 grid obtains the current potential on resistance R21, R22, thus conducting, between the voltage bus being connected to current rectifying and wave filtering circuit output due to part LED lamp bead and the drain electrode of power switch pipe Q2, so can be shorted, make described LED load group pressure drop decline thus, electric current is maintained, improve the waveform of input current, improve power factor.
Described constant-current control circuit comprises sampling resistor RS, switching tube Q1, operational amplifier IC1 and voltage reference IC4; Described voltage reference IC4 plus earth, the normal phase input end of negative electrode concatenation operation amplifier IC1; Described LED load group negative pole connects the drain electrode of described power switch pipe Q1, and described switching tube Q1 is N-type metal-oxide-semiconductor, and the source electrode of described switching tube Q1 connects sampling resistor RS, the other end ground connection of described sampling resistor RS; Described sampling resistor RS comprises resistance RS1, RS2, RS3, and described sampling resistor RS is connected to the inverting input of described operational amplifier IC1, and the output of described operational amplifier IC1 connects the grid of described power switch pipe Q1 by resistance R10.
Fixed voltage value on the more described reference voltage IC4 of described operational amplifier IC1 and the magnitude of voltage on the 3rd sampling resistor, export the grid connecting described power switch pipe Q1, can realize constant current function.Because reference voltage takes from reference voltage IC4, do not change with input voltage, therefore input power is relatively less with input voltage change.
The present embodiment high-voltage linear constant current LED drive circuit also can external controllable silicon dimmer, when connecting controllable silicon dimmer, described passive leadage circuit, for providing the electric current of the maintenance needed for controllable silicon work, prevents the bad phenomenon such as emergent power saltus step, flicker in dimming process.
Described passive leadage circuit connects current rectifying and wave filtering circuit, and particularly, described passive leadage circuit comprises the passive leadage circuit of the passive leadage circuit of the first order and the second level in parallel.Connect with electric capacity CX1 after resistance R1a, R1b, R1c parallel connection and form the passive leadage circuit of the first order, connecting with electric capacity CX2 after described resistance R2a, R2b, R2c parallel connection forms the passive leadage circuit in the second level.
Embodiment 2
As shown in figures 1 and 3, the present embodiment difference from Example 1 is that described constant-current control circuit comprises the second sampling resistor, sampling resistor RS, switching tube Q1 and operational amplifier IC1.The feeder ear of the tie point concatenation operation amplifier IC1 of the resistance R14 in described amplifier power supply circuits and electric capacity EC1 is powered for it, described second sampling resistor comprises resistance R7, R8, R9 of series connection, described resistance R7 connects the voltage bus that described current rectifying and wave filtering circuit exports, described resistance R9 ground connection; Voltage on described resistance R9 is connected to the normal phase input end of described operational amplifier IC1; The positive pole of described LED load group connects the voltage bus of described current rectifying and wave filtering circuit output, and the negative pole of described LED load group connects the drain electrode of described switching tube Q1, and the source electrode of described switching tube Q1 connects sampling resistor RS, the other end ground connection of sampling resistor RS; Sampling resistor RS comprises resistance RS1, RS2, RS3, and described sampling resistor RS is connected to the inverting input of described operational amplifier IC1, and the output of described operational amplifier IC1 connects the grid of described switching tube Q1 by resistance R10.
Magnitude of voltage on the sampled value (voltage on resistance R9) of the voltage bus that the more described current rectifying and wave filtering circuit of described operational amplifier IC1 exports and sampling resistor RS, export the grid connecting described power switch pipe Q1, the On current of power switch pipe Q1 described in Serial regulation, can realize constant current function.Because reference voltage takes from the voltage on the 3rd sampling resistor, this voltage is with input voltage linear change, and namely output current is also along with input voltage linear change, and therefore dimming scope is larger.
Embodiment 3
As shown in Figure 1 and Figure 4, the present embodiment difference from Example 2 is, the circuit base of embodiment 1 adds power compensating circuit, described power compensating circuit comprises operational amplifier IC3, the normal phase input end of the concatenation operation amplifier IC1 after described power compensating circuit process of the voltage on resistance R9.The feeder ear of the tie point concatenation operation amplifier IC3 of the resistance R14 in described amplifier power supply circuits and electric capacity EC1, the output of described operational amplifier IC3 is that operational amplifier IC1 powers by the normal phase input end of resistance R26 concatenation operation amplifier IC1.Described resistance R9 connects the inverting input of described operational amplifier IC3 by resistance R24.The normal phase input end of described operational amplifier IC3 connects ground connection after voltage reference IC4 by resistance R23, the normal phase input end of described operational amplifier IC3 output concatenation operation amplifier IC1.
When input voltage significantly down fluctuates, fixed voltage value difference on the anti-phase input terminal voltage of described operational amplifier IC3 and voltage reference IC4 increases, therefore the increase that operational amplifier IC3 output voltage is suitable according to a certain percentage, the output of operational amplifier IC1 also increases thereupon, the current peak of lamp pearl also suitably increases, and total input power is substantially remained unchanged in certain voltage excursion.The present embodiment has input power back off function, even if there is fluctuation in utility grid, and, when particularly voltage significantly rises, the power of whole lamp is unlikely to rise cause very soon burning lamp.
The utility model circuit structure advantages of simple, eliminate the IC chip of high cost, pass through Current Feedback Control, lamp pearl Discrete control, (the English full name of PFC is " PowerFactorCorrection " to achieve high PFC, be meant to " power factor correction ", power factor refers to the relation between effective power and apparent power, namely effective power is divided by the ratio of total power consumption, power factor can weigh the degree that electric power is used effectively, when power factor value is larger, represent its electric power utilance higher), the linear constant current function of high efficiency and high flexibility, also comprise the passive leadage circuit for providing the maintenance electric current needed for controllable silicon work in this circuit, described passive leadage circuit is connected with described current rectifying and wave filtering circuit.Owing to having possessed passive leadage circuit, a kind of high-voltage linear constant current LED drive circuit of the utility model can mate with outside controllable silicon dimmer, make it to possess light modulation effect, prevent the bad phenomenon such as emergent power saltus step, flicker in dimming process, extend the merit of LED drive circuit, simultaneously external controllable silicon dimmer, for realizing input power auto-compensation, improves the useful life of LED lamp greatly; Described power compensating circuit has input power back off function, and at circuit start or when carrying out light modulation, even if input voltage alters a great deal, when particularly voltage significantly rises, the power of whole lamp is unlikely to rise cause very soon burning lamp.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned execution mode and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this specification, this does not form any restriction to the utility model.
Claims (8)
1. a high-voltage linear constant current LED drive circuit, comprises current rectifying and wave filtering circuit, LED load group, amplifier power supply circuits and constant-current control circuit, it is characterized in that, also comprise PFC Circuit tuning, wherein:
Described constant-current control circuit utilizes FEEDBACK CONTROL to be maintained by the constant of electric current in LED load group;
Described amplifier power supply circuits are constant-current control circuit, operational amplifier in PFC Circuit tuning is powered;
Described PFC Circuit tuning improves the waveform of input current by the pressure drop of adjustment LED load group, improves power factor;
Described current rectifying and wave filtering circuit connects described amplifier power supply circuits, LED load group and PFC Circuit tuning respectively, described amplifier power supply circuits connect described constant-current control circuit and described PFC Circuit tuning, described constant-current control circuit connects described LED load group, and described PFC Circuit tuning connects described LED load group.
2. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 1, is characterized in that, described LED load group comprises multiple LED lamp bead.
3. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 2, it is characterized in that, described PFC Circuit tuning comprises operational amplifier IC2, voltage reference IC4, the first sampling resistor, switching tube Q3 and Q2, and described amplifier power supply circuits connect described operational amplifier IC2; The plus earth of described voltage reference IC4, the normal phase input end of negative electrode concatenation operation amplifier IC2; Described first sampling resistor one end connects the voltage bus that described current rectifying and wave filtering circuit exports, other end ground connection; The inverting input of described first sampling resistor concatenation operation amplifier IC2, switching tube Q3 described in the output connection control of described operational amplifier IC2; Described switching tube Q3 one end ground connection, the other end connects the voltage bus of described current rectifying and wave filtering circuit output by resistance R20, R21, R22 of series connection, and the tie point of described resistance R20 and R21 connects described switching tube Q2; Described switching tube Q2 one end connects the voltage bus that described current rectifying and wave filtering circuit exports, and the other end is connected between any two the lamp pearls in multiple LED lamp bead.
4. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 1, is characterized in that, described constant-current control circuit comprises sampling resistor RS, switching tube Q1, operational amplifier IC1 and voltage reference IC4; Described voltage reference IC4 plus earth, the normal phase input end of negative electrode concatenation operation amplifier IC1; Described LED load group negative pole connects described switching tube Q1, and described switching tube Q1 connects sampling resistor RS, the other end ground connection of described sampling resistor RS; Described sampling resistor RS is connected to the inverting input of described operational amplifier IC1, and the output of described operational amplifier IC1 connects described switching tube Q1.
5. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 1, is characterized in that, described constant-current control circuit comprises the second sampling resistor, switching tube Q1, sampling resistor RS and operational amplifier IC1; Described second sampling resistor comprises resistance R7, R8, R9 of series connection, and described resistance R7 connects the voltage bus that described current rectifying and wave filtering circuit exports, described resistance R9 ground connection; Voltage sample on described resistance R9 is to the normal phase input end of described operational amplifier IC1; The positive pole of described LED load group connects the voltage bus of described current rectifying and wave filtering circuit output, the negative pole of described LED load group connects one end of described switching tube Q1, the described power switch pipe Q1 other end connects sampling resistor RS, the other end ground connection of described sampling resistor RS; Described 3rd sampling resistor is connected to the inverting input of described operational amplifier IC1, switching tube Q1 described in the output connection control of described operational amplifier IC1.
6. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 5, it is characterized in that, described constant-current control circuit also comprises power compensating circuit, described power compensating circuit comprises operational amplifier IC3, resistance R23, resistance R24, voltage reference IC4, and described resistance R9 connects the inverting input of described operational amplifier IC3 by resistance R24; The normal phase input end of described operational amplifier IC3 connects voltage reference IC4 by resistance R23; The normal phase input end of the output concatenation operation amplifier IC1 of operational amplifier IC3.
7. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 1, is characterized in that, also comprise for providing the passive leadage circuit maintaining electric current needed for controllable silicon work, described passive leadage circuit is connected with described current rectifying and wave filtering circuit.
8. a kind of high-voltage linear constant current LED drive circuit as claimed in claim 7, it is characterized in that, described passive leadage circuit comprises the passive leadage circuit of the passive leadage circuit of the first order and the second level in parallel, the passive leadage circuit of the described first order comprises resistance R1 and electric capacity CX1, and described resistance R1 connects with described electric capacity CX1; The passive leadage circuit in the described second level comprises resistance R2 and electric capacity CX2, and described resistance R2 connects with described electric capacity CX2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520536034.2U CN204795788U (en) | 2015-07-22 | 2015-07-22 | Linear constant current LED drive circuit of high pressure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520536034.2U CN204795788U (en) | 2015-07-22 | 2015-07-22 | Linear constant current LED drive circuit of high pressure |
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| CN204795788U true CN204795788U (en) | 2015-11-18 |
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| CN201520536034.2U Expired - Fee Related CN204795788U (en) | 2015-07-22 | 2015-07-22 | Linear constant current LED drive circuit of high pressure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105072742A (en) * | 2015-07-22 | 2015-11-18 | 佛山冠今光电科技有限公司 | High-voltage linear constant-current LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105072742A (en) * | 2015-07-22 | 2015-11-18 | 佛山冠今光电科技有限公司 | High-voltage linear constant-current LED drive circuit |
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