CN106322321A - LED illumination down lamp with protection constant current drive - Google Patents
LED illumination down lamp with protection constant current drive Download PDFInfo
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- CN106322321A CN106322321A CN201610968958.9A CN201610968958A CN106322321A CN 106322321 A CN106322321 A CN 106322321A CN 201610968958 A CN201610968958 A CN 201610968958A CN 106322321 A CN106322321 A CN 106322321A
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- 238000005286 illumination Methods 0.000 title claims description 27
- 239000004065 semiconductor Substances 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims description 9
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- 230000003321 amplification Effects 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
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- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000686 essence Substances 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses an LED lighting down lamp with protection constant current drive, which comprises a lamp body, wherein the lamp body comprises an anti-surge protection circuit, a rectification filter circuit, a constant current drive circuit and an LED lamp tube which are sequentially connected in series, the anti-surge protection circuit comprises first to third resistors, sixth to ninth resistors, first to second capacitors, a fourth electrolytic capacitor, first to second triodes, an MOS (metal oxide semiconductor) tube and a voltage stabilizing tube, and the constant current drive circuit comprises a first reference constant current source, second to third constant current sources, an operational amplifier, a current mirror image tube, a drive tube, tenth to twelfth resistors and a fifth capacitor. The circuit structure of the invention is simple, the cost is low, the direct current surge voltage can be clamped to the voltage range borne by the load, the normal work of the preceding-stage power supply equipment is not influenced even if the load part fails, the power consumption of the constant current driving circuit can be reduced to the maximum extent, the accurate mirror image amplification of the current is realized, the loading capacity of the chip is improved, and the over-current protection and anti-interference functions are realized.
Description
Technical field
The present invention relates to lighting field, particularly to a kind of LED illumination Down lamp with protection constant-current driving.
Background technology
Existing LED illumination Down lamp generally includes lamp body and lampshade, and lamp body includes circuit board and LED lamp tube, and LED lamp tube is solid
Dingan County fills on circuit boards, and circuit board is generally provided with anti-surge protection circuit and constant-current drive circuit.Surge is also electricity
Gush or surging, it is simply that beyond the transient overvoltage of normal working voltage.Essentially, surge generally refers to what power supply had just been opened
The strong pulse that moment breath produces, due to the non-linear pulse likely having higher than power supply itself of circuit itself；Or by
In power supply or circuit, other parts are disturbed by or external spike own.Existing anti-surge circuit can fast and effeciently press down
Overvoltage surge processed, but circuit structure is complicated, and loss is relatively big, and the energy of surge voltage is converted to greatly thermal energy consumption and falls, circuit
It is lost bigger.Although some TVS pipe can suppress surge voltage and surge voltage energy conversion thermal energy is consumed, but also
The input power of feeder ear moves ground short circuit to, causes the equipment of feeder ear prime also cannot work.
In prior art, there is certain lacking in some constant-current drive circuit in terms of reducing power consumption and electric current exact mirror image
Fall into.Some constant-current drive circuit achieves the exact mirror image to electric current and amplifies, it is also possible to output drives the source-drain electrode pressure reduction of pipe
Optimum is set to, but the adjustment pipe of active output-stage circuit also exists power consumption, adds the face of domain in integrated circuit simultaneously
Long-pending.It addition, existing anti-surge protection circuit and constant-current drive circuit all do not have good overcurrent protection and anti-tampering function.
Summary of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, it is provided that a kind of circuit structure is relatively
For simply, cost is relatively low, in voltage range direct current surge voltage clamper to load can born, even if event occurs in loading section
Barrier nor affects on the normal work of prime power supply unit, can maximize the power consumption reducing constant-current drive circuit, and realize electric current
Exact mirror image amplifies, and improves chip belt loading capability, has the LED with protection constant-current driving of overcurrent protection and anti-tampering function
Illumination down lamp.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED with protection constant-current driving
Illumination down lamp, including lamp body, described lamp body includes anti-surge protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit, control electricity
Road and LED lamp tube, described anti-surge protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit and LED lamp tube be sequentially connected in series, institute
State control circuit to be connected with described constant-current drive circuit, described anti-surge protection circuit include the first resistance, the second resistance, the 3rd
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electric capacity, the second electric capacity, the 4th electrochemical capacitor, first
Audion, the second audion, metal-oxide-semiconductor and stabilivolt, one end of described first resistance connects input anode, described first resistance
The other end be connected with one end of described second resistance and one end of the first electric capacity respectively, the other end of described second resistance and institute
The colelctor electrode stating the first audion connects, and the emitter stage of described first audion connects input by described 3rd resistance and bears
Pole, the other end of described first electric capacity is connected with the base stage of described second audion, and the colelctor electrode of described second audion is respectively
It is connected with the grid of positive pole, one end of the 6th resistance, one end of the 7th resistance and the metal-oxide-semiconductor of described stabilivolt, the described 2nd 3
The source electrode of the emitter stage of pole pipe, the negative pole of stabilivolt, the other end of the 7th resistance and metal-oxide-semiconductor is all connected with described input anode,
The base stage of described first audion is respectively with one end of one end, one end of the 8th resistance and the 9th resistance of described second electric capacity even
Connecing, the other end of the other end of described second electric capacity, the other end of the 6th resistance and the 9th resistance is all connected with described input and bears
Pole, the described other end of the 8th resistance is connected with the drain electrode of described metal-oxide-semiconductor, one end and the described 8th of described 4th electrochemical capacitor
The other end of resistance and output head anode connect, the other end of described 4th electrochemical capacitor and the other end of described 9th resistance and
Negative pole of output end connects；Described constant-current drive circuit includes the first benchmark constant-current source, the second constant-current source, the 3rd constant-current source, computing
Amplifier, current mirror image tube, driving pipe, booster circuit, the 11st resistance, the 12nd resistance and the 5th electric capacity, described computing is put
The in-phase input end of big device by described 12nd resistance respectively with one end and the 11st resistance of described first benchmark constant-current source
One end connect, the reverse input end of described operational amplifier respectively with the source electrode of described current mirror image tube and the 14th resistance
One end connects, the outfan of described operational amplifier by described 5th electric capacity respectively with the grid of described current mirror image tube and the
One end of 16 resistance connects, the drain electrode of described current mirror image tube respectively with one end and the 15th resistance of described second constant-current source
One end connect, the other end of described 16th resistance respectively with one end of described 3rd constant-current source and the grid company that drives pipe
Connect, the other end of described 11st resistance, the other end of the 14th resistance, the other end of the 3rd constant-current source and the source electrode of driving pipe
All ground connection, the other end of described 15th resistance is managed with one end of described LED lamp tube, the input of booster circuit and driving respectively
Drain electrode connect, the outfan of described booster circuit is connected with the other end of described LED lamp tube.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described constant-current drive circuit also includes
13rd resistance and the 6th electric capacity, the reverse input end of described operational amplifier by described 13rd resistance respectively with described the
The source electrode of one end of 14 resistance and current mirror image tube connects, and the grid of described driving pipe is by described 6th electric capacity and described the
The other end of 16 resistance connects.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described constant-current drive circuit also includes
17th resistance, the drain electrode of described driving pipe is connected with the other end of described 15th resistance by described 17th resistance.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described anti-surge protection circuit also wraps
Including the 4th resistance, the colelctor electrode of described second audion is connected with described input anode by described 4th resistance.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described anti-surge protection circuit also wraps
Including the 5th resistance, the negative pole of described Zener diode is connected with described input anode by described 5th resistance.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described anti-surge protection circuit also wraps
Including the 3rd electric capacity, the colelctor electrode of described second audion is connected with one end of described 3rd electric capacity, another of described 3rd electric capacity
End is connected with the grid of described metal-oxide-semiconductor.
In the LED illumination Down lamp with protection constant-current driving of the present invention, described anti-surge protection circuit also wraps
Including the tenth resistance, the base stage of described first audion is connected with one end of described tenth resistance, the other end of described tenth resistance
It is connected with described one end of 8th resistance and one end of the 9th resistance respectively.
Implement the LED illumination Down lamp with protection constant-current driving of the present invention, have the advantages that due to lamp body bag
Include anti-surge protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit, control circuit and LED lamp tube, anti-surge protection circuit bag
Include the first resistance, the second resistance, the 3rd resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electric capacity,
Two electric capacity, the 4th electrochemical capacitor, the first audion, the second audion, metal-oxide-semiconductor and Zener diode, constant-current drive circuit includes
First benchmark constant-current source, the second constant-current source, the 3rd constant-current source, operational amplifier, current mirror image tube, drive pipe, booster circuit, the
11 resistance, the 12nd resistance and the first electric capacity；When metal-oxide-semiconductor turns on, the resistance between source electrode and the grid of metal-oxide-semiconductor is the least,
Therefore DC power output voltage is i.e. equal to load input voltage, in the case of DC source is constant, improves load capacity,
Significantly reduce the power consumption of protection circuit；By doing that the first electric capacity is possible to prevent between the second audion and the 3rd audion
Disturb, overcurrent protection can be carried out by the 3rd resistance；Can be by surge electricity by the resistance of regulation the 8th resistance and the 9th resistance
Pressure is restricted in the voltage range that load can be born；It is amplified to LED lamp tube by constant-current source electric current is carried out precise proportions, this
Sample can arrange current detection circuit, reduces the power consumption of constant-current drive circuit, improves drive efficiency, improves band simultaneously and carries
Ability, it is possible to simplify the heat radiation in the IC chip manufacturing process of this LED illumination Down lamp with protection constant-current driving
Device, by arranging the pressure reduction between grid and the source electrode of current mirror image tube and the pressure reduction between the grid and the source electrode that drive pipe
Become essentially equal, the pressure reduction between drain electrode and the source electrode of current mirror image tube and the pressure reduction between the drain electrode and the source electrode that drive pipe are set
It is set to essentially equal, it is achieved that the exact mirror image of benchmark constant-current source electric current is amplified, stream can be carried out by the 12nd resistance
Protection, can avoid the interference between operational amplifier and current mirror image tube by the 5th electric capacity, and therefore its circuit structure is more
Simply, cost is relatively low, in voltage range direct current surge voltage clamper to load can born, even if loading section breaks down
Nor affect on the normal work of prime power supply unit, the power consumption reducing constant-current drive circuit can be maximized, and realize electric current essence
Really mirror image amplifies, and improves chip belt loading capability, has overcurrent protection and anti-tampering function.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation that the present invention has in one embodiment of LED illumination Down lamp of protection constant-current driving；
Fig. 2 is the electrical block diagram of anti-surge protection circuit in described embodiment；
Fig. 3 is the electrical block diagram of constant-current drive circuit in described embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In the present invention has the LED illumination Down lamp embodiment of protection constant-current driving, this has the LED of protection constant-current driving
The structural representation of illumination down lamp is as shown in Figure 1.In Fig. 1, this LED illumination Down lamp with protection constant-current driving includes lamp body
(not shown), above-mentioned lamp body includes anti-surge protection circuit 1, current rectifying and wave filtering circuit 2, constant-current drive circuit 3, control circuit
4 and LED lamp tube 5, wherein, anti-surge protection circuit 1, current rectifying and wave filtering circuit 2, constant-current drive circuit 3 and LED lamp tube 5 are gone here and there successively
Connecing, control circuit 4 is connected with constant-current drive circuit 3.
Fig. 2 is the electrical block diagram of anti-surge protection circuit in the present embodiment；In Fig. 2, this anti-surge protection circuit 1
Including the first resistance R1, the second resistance R2, the 3rd resistance R3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th electricity
Resistance R9, the first electric capacity C1, the second electric capacity C2, the 4th electrochemical capacitor C4, the first audion Q1, the second audion Q2, metal-oxide-semiconductor Q3 and
Zener diode ZD1, wherein, the first electric capacity C1 is coupling electric capacity, be used for avoiding the second audion Q2 and the 3rd audion Q3 it
Between interference.In the present embodiment, the second audion Q2 is PNP type triode, and the 3rd audion Q3 is NPN type triode, certainly,
In actual applications, the second audion Q2 can also be NPN type triode, and the 3rd audion Q3 can also be PNP type triode,
But at this moment the structure of anti-surge protection circuit also to change accordingly.Above-mentioned 3rd resistance R3 is current-limiting resistance, for the
The branch road at the emitter stage place of one audion Q1 carries out overcurrent protection, so it has overcurrent protection and anti-tampering function.
One end of above-mentioned first resistance R1 connects input anode Vi+, and the other end of the first resistance R1 is electric with second respectively
One end of resistance R2 and one end of the first electric capacity C1 connect, and the other end of the second resistance R2 and the colelctor electrode of the first audion Q1 are even
Connecing, the emitter stage of the first audion Q1 connects input cathode Vi-by the 3rd resistance R3, the other end of the first electric capacity C1 and the
The base stage of two audion Q2 connects, the colelctor electrode of the second audion Q2 respectively with positive pole, the 6th resistance R6 of Zener diode ZD1
One end, one end of the 7th resistance R7 and metal-oxide-semiconductor Q3 grid connect, the emitter stage of the second audion Q2, Zener diode ZD1
The source electrode of negative pole, the other end of the 7th resistance R7 and metal-oxide-semiconductor Q3 be all connected with input anode Vi+, Zener diode ZD1 sets
Put and be possible to prevent the source electrode of metal-oxide-semiconductor Q3 and grid voltage difference excessive and cause metal-oxide-semiconductor Q3 breakdown, go here and there with Zener diode ZD1
The 6th resistance R6 that connection connects then is avoided that Zener diode ZD1 is burned out.
In the present embodiment, the base stage of the first audion Q1 respectively with one end, one end of the 8th resistance R8 of the second electric capacity C2
Connecting with one end of the 9th resistance R9, the other end of the second electric capacity C2, the other end of the 6th resistance R6 and the 9th resistance R9's is another
One end is all connected with input cathode Vi-, and the other end of the 8th resistance R8 is connected with the drain electrode of metal-oxide-semiconductor Q3, the 4th electrochemical capacitor C4
One end be connected with the other end and the output head anode Vo+ of the 8th resistance R8, the other end of the 4th electrochemical capacitor C4 and the 9th electricity
The other end and the negative pole of output end Vo-of resistance R9 connect.In the present embodiment, the concrete resistance root of the 8th resistance R8 and the 9th resistance R9
According to being actually needed regulation.Second electric capacity C2 is for compensating electric capacity.Thunderbolt or voltage wave can be effectively suppressed by anti-surge protection circuit 1
The peak voltage of the dynamic power supply input caused, improves security of system, increases the service life.
During normal circuit operation, due to the dividing potential drop effect of the 7th resistance R7, the source voltage of metal-oxide-semiconductor Q3 is more than grid electricity
Pressure, and cut-in voltage VGS (th), the metal-oxide-semiconductor Q3 conducting more than metal-oxide-semiconductor Q3, the drain-source resistance R of metal-oxide-semiconductor Q3DSThe least, the most only
There are tens milliohms, so the voltage of outfan is approximately equal to the voltage of input, equal to the voltage at the 4th electrochemical capacitor C4 two ends.
Dividing potential drop due to the 9th resistance R9 is less than conducting voltage V of the first audion Q1be, the first audion Q1 is in cut-off state.Phase
With, due to the dividing potential drop effect of the first resistance R1, cause the voltage U between base stage and the emitter stage of the second audion Q2be＜ 0,
So the second audion Q2 is also at cut-off state.
When surge voltage occurs in DC source, owing to surge voltage is more than normal working voltage, therefore, surge voltage is first
First the 4th electrochemical capacitor C4 is charged, along with the 4th electrochemical capacitor C4 both end voltage increases, the dividing potential drop of the 9th resistance R9
It is gradually increased, when the dividing potential drop of the 9th resistance R9 is more than conducting voltage V of the first audion Q1be, the first audion Q1 conducting, then
The dividing potential drop of the first resistance R1 and the second resistance R2 conducting voltage U more than the second audion Q2be, the second audion Q2 is also switched on,
Metal-oxide-semiconductor Q3 turns off, and the 4th electrochemical capacitor C4 starts powering load.Output voltage VbeIt is base stage and the transmitting of the first audion Q1
Pole conducting voltage, changes surge protection magnitude of voltage by changing the ratio of the 8th resistance R8 and the 9th resistance R9.
When DC source recovers normal, the dividing potential drop of the 8th resistance R8 and the 9th resistance R9 is led less than the first audion Q1's
Energising pressure VbeTime, the first audion Q1 is operated in cut-off state, and metal-oxide-semiconductor Q3 is the most open-minded, recovers normal power supply.
Metal-oxide-semiconductor Q3 conducting during normal work, the resistance between source electrode and the grid of metal-oxide-semiconductor Q3 is the least, therefore DC source
Output voltage i.e. equal to load input voltage, in the case of DC source is constant, improve load capacity, significantly reduce
The power consumption of protection circuit；Can be restricted to surge voltage load energy by the resistance of regulation the 8th resistance R8 and the 9th resistance R9
In the voltage range enough born, it is simple, convenient fast, decreases misuse rate, meanwhile, improves the spirit of protection circuit
Activity and adaptability, it is simple to promote the use of.Utilize the first audion Q1, the second audion Q2 and the conducting of metal-oxide-semiconductor Q3, cut-off spy
Property, make the present invention possess self-disabling protection and anti-reverse automatic protection functions.The circuit structure of the present invention is simple, volume relatively
Little, cost is relatively low, reliability is higher.
Fig. 3 is the electrical block diagram of constant-current drive circuit in the present embodiment, and in Fig. 3, this constant-current drive circuit 2 includes
First benchmark constant-current source I1, the second constant-current source I2, the 3rd constant-current source I3, operational amplifier A, current mirror image tube Q4, drive pipe Q5,
Booster circuit, the 11st resistance R11, the 12nd resistance R12 and the 5th electric capacity C5, wherein, the first benchmark constant-current source I1 is 20uA
Constant-current source, the second constant-current source I2 is the constant-current source of 40uA, and the 3rd constant-current source I3 is the constant-current source of 20uA.Certainly, should in reality
In with, the first benchmark constant-current source I1, the second constant-current source I2 and the 3rd constant-current source I3 can also select the constant-current source of other sizes.On
Stating the 12nd resistance R12 is current-limiting resistance, for the in-phase input end of operational amplifier A is carried out overcurrent protection.5th electric capacity
C5 is coupling electric capacity, for avoiding the interference between operational amplifier A and current mirror image tube Q4.
The in-phase input end of above-mentioned operational amplifier A passes through the 12nd resistance R12 respectively with the first benchmark constant-current source I1's
One end of one end and the 11st resistance R11 connects, the reverse input end of operational amplifier A respectively with the source electrode of current mirror image tube Q4
Connect with one end of the 14th resistance R14, the outfan of operational amplifier A by the 5th electric capacity C5 respectively with current mirror image tube Q4
Grid and one end of the 16th resistance R16 connect, the drain electrode of current mirror image tube Q4 respectively with one end of the second constant-current source I2 and
One end of 15th resistance R15 connects, and the other end of the 16th resistance R16 is managed with one end of the 3rd constant-current source I2 and driving respectively
The grid of Q5 connects, the other end of the 11st resistance R11, the other end of the 14th resistance R14, the other end of the 3rd constant-current source I3
With drive pipe Q5 source grounding, the other end of the 15th resistance R15 respectively with one end of LED lamp tube 5, booster circuit defeated
Entering end and drive the drain electrode of pipe Q5 to connect, the outfan of booster circuit is connected with the other end of LED lamp tube 5.
Control circuit 2 can change the output electric current of constant-current drive circuit 3, thus regulates the brightness of this LED illumination Down lamp.
As it is shown on figure 3, in the present embodiment, constant-current drive circuit 3 also includes the 13rd resistance R13 and the 6th electric capacity C6, fortune
Calculate the reverse input end of amplifier A by the 13rd resistance R13 respectively with one end and the current mirror image tube Q4 of the 14th resistance R14
Source electrode connect, drive the grid of pipe Q5 by the connection of the other end of the 6th electric capacity C6 and the 16th resistance R16.Wherein, the tenth
Three resistance R13 are current-limiting resistance, for carrying out the direct current between reverse input end and the current mirror image tube Q4 of operational amplifier A
Overcurrent protection.6th electric capacity C6 is coupling electric capacity, for avoiding operational amplifier A and driving the interference between pipe Q5.
In the present embodiment, this constant-current drive circuit 3 also includes the 17th resistance R17, drives the drain electrode of pipe Q5 by the tenth
The other end of seven resistance R17 and the 15th resistance R15 connects.17th resistance R17 is current-limiting resistance, for driving pipe Q5's
The branch road at drain electrode place carries out overcurrent protection.
It is noted that in the present embodiment, above-mentioned current mirror image tube Q4 and driving pipe Q5 is N-channel MOS pipe, when
So, in actual applications, current mirror image tube Q4 and driving pipe Q5 can also select P-channel metal-oxide-semiconductor, but at this moment this constant-current driving is electric
The structure on road also to change accordingly.
First benchmark constant-current source I1 produces pressure drop V1 on the 11st resistance R11, as the reference voltage of operational amplifier A
Accessing its input in the same direction, the output of operational amplifier A is connected to the grid of current mirror image tube Q4, in order to driven current mirror image tube
Q4, operational amplifier A, current mirror image tube Q4 and the 14th resistance R14 constitute degeneration factor, so on current mirror image tube Q4
The electric current flow through is equal to the first benchmark constant-current source I1, it is achieved current mirror image tube Q4 is accurate to the electric current of the first benchmark constant-current source I1
Replicate.
In the present embodiment, pipe Q5 and the source electrode of current mirror image tube Q4, drain and gate is driven to be in identical circuit
In state, i.e. drive the pressure reduction between pressure reduction and grid and the source electrode of current mirror image tube Q4 between grid and the source electrode of pipe Q5 complete
The most equal, drive the pressure reduction between pressure reduction and drain electrode and the source electrode of current mirror image tube Q4 between drain electrode and the source electrode of pipe Q5 complete
Equal.Thus can guarantee that and drive pipe Q5 that the exact mirror image of electric current on current mirror image tube Q4 is amplified.
In the present embodiment, the drain voltage driving pipe Q5 is limited to Vdsat (max) place of booster circuit.By boosting
Circuit collection drives the voltage difference between drain electrode and the source electrode of pipe Q5, adjusts the voltage of LED lamp tube 5, makes LED lamp tube 5
Voltage reaches optimum, so that driving the voltage difference between drain electrode and the source electrode of pipe Q5 close to saturation pressure depreciation, drops further
Low-power consumption.
As in figure 2 it is shown, above-mentioned anti-surge protection circuit 1 also includes the 4th resistance R4, the colelctor electrode of the second audion Q2 leads to
Cross the 4th resistance R4 to be connected with input anode Vi+.4th resistance R4 is current-limiting resistance, for the transmitting to the second audion Q2
The branch road at place, pole carries out overcurrent protection.In the present embodiment, this anti-surge protection circuit 1 also includes the 5th resistance R5, voltage stabilizing two
The negative pole of pole pipe ZD1 is connected with input anode Vi+ by the 5th resistance R5.5th resistance R5 is current-limiting resistance, for surely
The branch road at pressure diode ZD1 place carries out overcurrent protection.
In the present embodiment, this anti-surge protection circuit 1 also includes the colelctor electrode and of the 3rd electric capacity C3, the second audion Q2
One end of three electric capacity C3 connects, and the other end of the 3rd electric capacity C3 is connected with the grid of metal-oxide-semiconductor Q3.3rd electric capacity C3 is coupling electricity
Hold, for avoiding the interference between the second audion Q2 and the 3rd audion Q3.
In the present embodiment, this anti-surge protection circuit 1 also includes the tenth resistance R10, the base stage of the first audion Q1 and the
One end of ten resistance R10 connects, the other end of the tenth resistance R10 respectively with one end and the one of the 9th resistance R9 of the 8th resistance R8
End connects.Tenth resistance R10 is current-limiting resistance, for the branch road at the first audion Q1 place is carried out overcurrent protection.
In a word, in the present embodiment, after system electrification, 220V alternating current is through the rectification of current rectifying and wave filtering circuit 2 and filtering
After be converted into unidirectional current, power to constant-current drive circuit 3.Constant-current drive circuit 3 normally works, can be by opening multiple opening step by step
Close, light all Down lamps being serially connected in LED lamp tube 5 therein successively, it is achieved high-efficiency high-power-factor.In the present embodiment, on
State and control button (not shown) can be set on lamp body, carry out adjusting control circuit 4 by pressing control button, thus change
The output electric current of constant-current drive circuit 3, thus can regulate the brightness of this LED illumination Down lamp.By anti-surge protection circuit 1
The peak voltage that can effectively produce due to thunderbolt or voltage pulsation in suppression circuit, reaches lightning protection effect, improves security of system
Property, increase the service life.Reduction circuit power consumption can be maximized by constant-current drive circuit 3, and realize the amplification of electric current exact mirror image,
Improve chip belt loading capability.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (7)
1. a LED illumination Down lamp with protection constant-current driving, it is characterised in that include that lamp body, described lamp body include wave resistance
Gush protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit, control circuit and LED lamp tube, described anti-surge protection circuit, whole
Stream filter circuit, constant-current drive circuit and LED lamp tube are sequentially connected in series, and described control circuit is connected with described constant-current drive circuit,
Described anti-surge protection circuit include the first resistance, the second resistance, the 3rd resistance, the 6th resistance, the 7th resistance, the 8th resistance,
9th resistance, the first electric capacity, the second electric capacity, the 4th electrochemical capacitor, the first audion, the second audion, metal-oxide-semiconductor and stabilivolt,
One end of described first resistance connects input anode, the other end of described first resistance respectively with one end of described second resistance
Connecting with one end of the first electric capacity, the other end of described second resistance is connected with the colelctor electrode of described first audion, and described the
The emitter stage of one audion connects input cathode, the other end of described first electric capacity and described second by described 3rd resistance
The base stage of audion connects, the colelctor electrode of described second audion respectively with the positive pole of described stabilivolt, one end of the 6th resistance,
One end of 7th resistance and the grid of metal-oxide-semiconductor connect, the emitter stage of described second audion, the negative pole of stabilivolt, the 7th resistance
The other end and the source electrode of metal-oxide-semiconductor be all connected with described input anode, the base stage of described first audion is respectively with described second
One end of one end of electric capacity, one end of the 8th resistance and the 9th resistance connects, the other end of described second electric capacity, the 6th resistance
The other end of the other end and the 9th resistance is all connected with described input cathode, the other end of described 8th resistance and described metal-oxide-semiconductor
Drain electrode connect, one end of described 4th electrochemical capacitor is connected with the other end and the output head anode of described 8th resistance, described
The other end of the 4th electrochemical capacitor is connected with the other end and the negative pole of output end of described 9th resistance；Described constant-current drive circuit bag
Include the first benchmark constant-current source, the second constant-current source, the 3rd constant-current source, operational amplifier, current mirror image tube, drive pipe, booster circuit,
11st resistance, the 12nd resistance and the 5th electric capacity, the in-phase input end of described operational amplifier passes through described 12nd resistance
It is connected with described one end of first benchmark constant-current source and one end of the 11st resistance respectively, the reverse input of described operational amplifier
End is connected with the source electrode of described current mirror image tube and one end of the 14th resistance respectively, and the outfan of described operational amplifier passes through
Described 5th electric capacity is connected with the grid of described current mirror image tube and one end of the 16th resistance respectively, described current mirror image tube
Drain electrode is connected with one end of described second constant-current source and one end of the 15th resistance respectively, and the other end of described 16th resistance divides
It is not connected with one end of described 3rd constant-current source and the grid of driving pipe, the other end of described 11st resistance, the 14th resistance
The other end, the other end of the 3rd constant-current source and drive pipe source grounding, the other end of described 15th resistance respectively with
The drain electrode of one end of described LED lamp tube, the input of booster circuit and driving pipe connects, the outfan of described booster circuit and institute
The other end stating LED lamp tube connects.
The LED illumination Down lamp with protection constant-current driving the most according to claim 1, it is characterised in that described constant current is driven
Galvanic electricity road also includes the 13rd resistance and the 6th electric capacity, and the reverse input end of described operational amplifier passes through described 13rd resistance
Being connected with described one end of 14th resistance and the source electrode of current mirror image tube respectively, the grid of described driving pipe passes through the described 6th
Electric capacity is connected with the other end of described 16th resistance.
The LED illumination Down lamp with protection constant-current driving the most according to claim 2, it is characterised in that described constant current is driven
Galvanic electricity road also includes the 17th resistance, another by described 17th resistance and described 15th resistance of the drain electrode of described driving pipe
One end connects.
4. according to the LED illumination Down lamp with protection constant-current driving described in claims 1 to 3 any one, it is characterised in that
Described anti-surge protection circuit also includes the 4th resistance, and the colelctor electrode of described second audion passes through described 4th resistance with described
Input anode connects.
The LED illumination Down lamp with protection constant-current driving the most according to claim 4, it is characterised in that described Anti-surging
Protection circuit also includes the 5th resistance, and the negative pole of described Zener diode is by described 5th resistance with described input anode even
Connect.
The LED illumination Down lamp with protection constant-current driving the most according to claim 5, it is characterised in that described Anti-surging
Protection circuit also includes that the 3rd electric capacity, the colelctor electrode of described second audion are connected with one end of described 3rd electric capacity, described
The other end of three electric capacity is connected with the grid of described metal-oxide-semiconductor.
The LED illumination Down lamp with protection constant-current driving the most according to claim 6, it is characterised in that described Anti-surging
Protection circuit also includes that the tenth resistance, the base stage of described first audion are connected with one end of described tenth resistance, the described tenth
The other end of resistance is connected with described one end of 8th resistance and one end of the 9th resistance respectively.
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| CN201610968958.9A CN106322321B (en) | 2016-11-03 | 2016-11-03 | LED illumination downlight with protection constant current driving |
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| CN201610968958.9A CN106322321B (en) | 2016-11-03 | 2016-11-03 | LED illumination downlight with protection constant current driving |
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| CN107846759A (en) * | 2017-12-12 | 2018-03-27 | 上海灿瑞科技股份有限公司 | A kind of LED drive chip |
| CN107995749A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The driving short-circuit protection circuit of classroom blackboard LED light strip |
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| CN108683167A (en) * | 2018-07-03 | 2018-10-19 | 苏州锴威特半导体有限公司 | A kind of anti-surge circuit of PD equipment |
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| CN109618466A (en) * | 2019-01-21 | 2019-04-12 | 苏州菲达旭微电子有限公司 | A kind of LED drive circuit based on power tube security protection |
| CN109639145A (en) * | 2019-01-28 | 2019-04-16 | 安徽智训机器人技术有限公司 | Elevator card media system |
| CN111641199A (en) * | 2020-05-07 | 2020-09-08 | 中国科学院声学研究所 | Overvoltage protection device and method applied to submarine observation network connection box |
| CN111641199B (en) * | 2020-05-07 | 2021-12-28 | 中国科学院声学研究所 | Overvoltage protection device and method applied to submarine observation network connection box |
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