CN106322321B - LED illumination downlight with protection constant current driving - Google Patents
LED illumination downlight with protection constant current driving Download PDFInfo
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- CN106322321B CN106322321B CN201610968958.9A CN201610968958A CN106322321B CN 106322321 B CN106322321 B CN 106322321B CN 201610968958 A CN201610968958 A CN 201610968958A CN 106322321 B CN106322321 B CN 106322321B
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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]
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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]
- 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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- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED illumination downlights with protection constant current driving; including lamp body; lamp body includes the anti-surge protection circuit being sequentially connected in series, current rectifying and wave filtering circuit, constant-current drive circuit and LED lamp tube; anti-surge protection circuit includes first to 3rd resistor, the 6th to the 9th resistance, the first to the second capacitor, the 4th electrolytic capacitor, the first to the second triode, metal-oxide-semiconductor and voltage-stabiliser tube, and constant-current drive circuit includes the first benchmark constant-current source, second to third constant-current source, operational amplifier, current mirror pipe, driving tube, the tenth to twelfth resistor and the 5th capacitor.Circuit structure of the invention is relatively simple; cost is relatively low; in the voltage range that direct current surge voltage clamper can be born to load; even if loading section, which breaks down, nor affects on the normal work of prime power supply unit; the power consumption for reducing constant-current drive circuit can be maximized; and realize that electric current exact mirror image amplifies, chip load capacity is improved, there is overcurrent protection and anti-tampering function.
Description
Technical field
The present invention relates to lighting area, in particular to a kind of LED illumination downlight with protection constant current driving.
Background technique
Existing LED illumination downlight 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 anti-surge protection circuit and constant-current drive circuit are generally provided on circuit board.Surge is also electricity
It gushes or surging, is just above 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 generates, due to the non-linear pulse being possible to higher than power supply itself of circuit itself；Or by
Other parts are by itself or the interference of external sharp pulse in power supply or circuit.Existing anti-surge circuit can fast and effeciently press down
Overvoltage surge processed, but circuit structure is complicated, and loss is larger, and the energy of surge voltage is converted to greatly thermal energy consumption and falls, circuit
It is lost larger.Although some TVS pipes are able to suppress surge voltage and surge voltage energy conversion thermal energy are consumed, but also
The input power of feeder ear is drawn to ground short circuit, causes the equipment of feeder ear prime that can not also work.
In the prior art, there is in terms of reducing power consumption and electric current exact mirror image certain lack in some constant-current drive circuits
It falls into.Some constant-current drive circuits realize the exact mirror image amplification to electric current, can also be by the source-drain electrode pressure difference of output driving pipe
It is arranged to optimum value, but there is power consumptions for the adjustment pipe of active output-stage circuit, while increasing the face of domain in integrated circuit
Product.In addition, existing anti-surge protection circuit and constant-current drive circuit are without good overcurrent protection and anti-tampering function.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, provide a kind of circuit structure compared with
To be simple, cost is relatively low, in the voltage range that direct current surge voltage clamper can be born to load, even if event occurs in loading section
Barrier nor affects on the normal work of prime power supply unit, can maximize the power consumption for reducing constant-current drive circuit, and realize electric current
Exact mirror image amplification, improves chip load capacity, the LED with protection constant current driving with overcurrent protection and anti-tampering function
Illumination down lamp.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of LED with protection constant current driving
Illumination down lamp, including lamp body, the lamp body include anti-surge protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit, control electricity
Road and LED lamp tube, the anti-surge protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit and LED lamp tube are sequentially connected in series, institute
It states control circuit to connect with the constant-current drive circuit, the anti-surge protection circuit includes first resistor, second resistance, third
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, first capacitor, the second capacitor, the 4th electrolytic capacitor, first
One end of triode, the second triode, metal-oxide-semiconductor and voltage-stabiliser tube, the first resistor connects input anode, the first resistor
The other end connect respectively with one end of one end of the second resistance and first capacitor, the other end of the second resistance and institute
The collector connection of the first triode is stated, the emitter of first triode connects input terminal by the 3rd resistor and bears
Pole, the other end of the first capacitor are connect with the base stage of second triode, the collector difference of second triode
It is connect with the anode of the voltage-stabiliser tube, one end of the 6th resistance, one end of the 7th resistance and the grid of metal-oxide-semiconductor, the described 2nd 3
The emitter of pole pipe, the cathode of voltage-stabiliser tube, the other end of the 7th resistance and the source electrode of metal-oxide-semiconductor are all connected with the input anode,
The base stage of first triode connects with one end of one end of second capacitor, one end of the 8th resistance and the 9th resistance respectively
It connects, it is negative that the other end, the other end of the 6th resistance and the other end of the 9th resistance of second capacitor are all connected with the input terminal
The other end of pole, the 8th resistance is connect with the drain electrode of the metal-oxide-semiconductor, one end and the described 8th of the 4th electrolytic capacitor
The other end of resistance is connected with output head anode, the other end of the 4th electrolytic capacitor and the other end of the 9th resistance and
Negative pole of output end connection；The constant-current drive circuit includes the first benchmark constant-current source, the second constant-current source, third constant-current source, operation
Amplifier, current mirror pipe, driving tube, booster circuit, eleventh resistor, twelfth resistor and the 5th capacitor, the operation are put
The non-inverting input terminal of big device by the twelfth resistor respectively with one end of the first benchmark constant-current source and eleventh resistor
One end connection, the reverse input end of the operational amplifier respectively with the source electrode of the current mirror pipe and the 14th resistance
One end connection, the output end of the operational amplifier by the 5th capacitor respectively with the grid of the current mirror pipe and the
One end of 16 resistance connects, the drain electrode of the current mirror pipe respectively with one end of second constant-current source and the 15th resistance
One end connection, the other end of the 16th resistance respectively with the grid of one end of the third constant-current source and driving tube connect
It connects, the other end of the eleventh resistor, the other end of the 14th resistance, the other end of third constant-current source and the source electrode of driving tube
It is grounded, the other end of the 15th resistance input terminal and driving tube with one end of the LED lamp tube, booster circuit respectively
Drain electrode connection, the output end of the booster circuit connect with the other end of the LED lamp tube.
In the LED illumination downlight with protection constant current driving of the present invention, the constant-current drive circuit further includes
Thirteenth resistor and the 6th capacitor, the reverse input end of the operational amplifier is by the thirteenth resistor respectively with described
One end of 14 resistance is connected with the source electrode of current mirror pipe, and the grid of the driving tube passes through the 6th capacitor and described the
The other end of 16 resistance connects.
In the LED illumination downlight with protection constant current driving of the present invention, the constant-current drive circuit further includes
The drain electrode of 17th resistance, the driving tube is connect by the 17th resistance with the other end of the 15th resistance.
In the LED illumination downlight with protection constant current driving of the present invention, the anti-surge protection circuit is also wrapped
The 4th resistance is included, the collector of second triode is connect by the 4th resistance with the input anode.
In the LED illumination downlight with protection constant current driving of the present invention, the anti-surge protection circuit is also wrapped
The 5th resistance is included, the cathode of the zener diode is connect by the 5th resistance with the input anode.
In the LED illumination downlight with protection constant current driving of the present invention, the anti-surge protection circuit is also wrapped
Include third capacitor, the collector of second triode is connect with one end of the third capacitor, the third capacitor it is another
End is connect with the grid of the metal-oxide-semiconductor.
In the LED illumination downlight with protection constant current driving of the present invention, the anti-surge protection circuit is also wrapped
The tenth resistance is included, the base stage of first triode is connect with one end of the tenth resistance, the other end of the tenth resistance
It is connect respectively with one end of one end of the 8th resistance and the 9th resistance.
Implement the LED illumination downlight with protection constant current driving of the invention, has the advantages that due to lamp body packet
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 packet
Include first resistor, second resistance, 3rd resistor, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, first capacitor,
Two capacitors, the 4th electrolytic capacitor, the first triode, the second triode, metal-oxide-semiconductor and zener diode, constant-current drive circuit include
First benchmark constant-current source, the second constant-current source, third constant-current source, operational amplifier, current mirror pipe, driving tube, booster circuit,
11 resistance, twelfth resistor and first capacitor；When metal-oxide-semiconductor conducting, resistance very little between the source electrode and grid of metal-oxide-semiconductor,
Therefore DC power output voltage is equal to load input voltage, in the case where DC power supply is constant, improves load capacity,
Significantly reduce the power consumption of protection circuit；It can be prevented by first capacitor dry between the second triode and third transistor
It disturbs, overcurrent protection can be carried out by 3rd resistor；Resistance value by adjusting the 8th resistance and the 9th resistance can be by surge electricity
Pressure is restricted in the voltage range that load is able to bear；By the way that constant current source current progress precise proportions are amplified to LED lamp tube, this
Sample can not have to setting current detection circuit, reduce the power consumption of constant-current drive circuit, improve drive efficiency, while improving band and carrying
Ability, and can simplify the heat dissipation in the IC chip manufacturing process with the LED illumination downlight for protecting constant current driving
Device is arranged by the pressure difference between the grid and source electrode of pressure difference and driving tube between the grid and source electrode by current mirror pipe
At essentially equal, the pressure difference between the drain electrode and source electrode of pressure difference and driving tube between the drain electrode and source electrode of current mirror pipe is set
It is set to essentially equal, realizes to the amplification of the exact mirror image of benchmark constant current source current, overcurrent can be carried out by twelfth resistor
Protection, can be to avoid the interference between operational amplifier and current mirror pipe by the 5th capacitor, therefore its circuit structure is more
Simply, cost is relatively low, in the voltage range that direct current surge voltage clamper can be born to load, even if loading section breaks down
The normal work of prime power supply unit is nor affected on, the power consumption for reducing constant-current drive circuit can be maximized, and realizes electric current essence
True mirror image amplification, improves chip load capacity, has overcurrent protection and anti-tampering function.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram in LED illumination downlight one embodiment that there is the present invention protection constant current to drive；
Fig. 2 is the electrical block diagram of anti-surge protection circuit in the embodiment；
Fig. 3 is the electrical block diagram of constant-current drive circuit in the embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the LED illumination downlight embodiment that the present invention has protection constant current driving, this has the LED of protection constant current driving
The structural schematic diagram of illumination down lamp is as shown in Figure 1.In Fig. 1, it includes lamp body that this, which has the LED illumination downlight of protection constant current driving,
(not shown), above-mentioned lamp body include 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 successively gone here and there
It connects, control circuit 4 is connect 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, the anti-surge protection circuit 1
Including first resistor R1, second resistance R2,3rd resistor R3, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th electricity
Hinder R9, first capacitor C1, the second capacitor C2, the 4th electrolytic capacitor C4, the first triode Q1, the second triode Q2, metal-oxide-semiconductor Q3 and
Zener diode ZD1, wherein first capacitor C1 be coupled capacitor, for avoid the second triode Q2 and third transistor Q3 it
Between interference.In the present embodiment, the second triode Q2 is PNP type triode, and third transistor Q3 is NPN type triode, certainly,
In practical applications, the second triode Q2 may be NPN type triode, and third transistor Q3 may be PNP type triode,
But at this moment the structure of anti-surge protection circuit also will accordingly change.Above-mentioned 3rd resistor R3 is current-limiting resistance, for the
Branch where the emitter of one triode Q1 carries out overcurrent protection, so it is with overcurrent protection and anti-tampering function.
One end of above-mentioned first resistor R1 connects input anode Vi+, and the other end of first resistor R1 is electric with second respectively
One end of resistance R2 is connected with one end of first capacitor C1, and the collector of the other end of second resistance R2 and the first triode Q1 connect
It connects, the emitter of the first triode Q1 is by 3rd resistor R3 connection input cathode Vi-, the other end of first capacitor C1 and the
The base stage of two triode Q2 connects, the collector of the second triode Q2 respectively with the anode of zener diode ZD1, the 6th resistance R6
One end, the 7th resistance R7 one end connected with the grid of metal-oxide-semiconductor Q3, emitter, the zener diode ZD1 of the second triode Q2
Cathode, the other end of the 7th resistance R7 and the source electrode of metal-oxide-semiconductor Q3 be all connected with input anode Vi+, zener diode ZD1's sets
It sets the source electrode that can prevent metal-oxide-semiconductor Q3 and grid voltage difference is excessive and cause metal-oxide-semiconductor Q3 breakdown, gone here and there with zener diode ZD1
6th resistance R6 of connection connection is then avoided that zener diode ZD1 is burned out.
In the present embodiment, the base stage of the first triode Q1 one end with one end of the second capacitor C2, the 8th resistance R8 respectively
Connected with one end of the 9th resistance R9, the other end of the second capacitor C2, the other end of the 6th resistance R6 and the 9th resistance R9 it is another
One end is all connected with input cathode Vi-, and the other end of the 8th resistance R8 is connect with the drain electrode of metal-oxide-semiconductor Q3, the 4th electrolytic capacitor C4
One end connect with the other end of the 8th resistance R8 and output head anode Vo+, the other end of the 4th electrolytic capacitor C4 and the 9th electricity
The other end of resistance R9 is connected with negative pole of output end Vo-.In the present embodiment, the specific resistance value root of the 8th resistance R8 and the 9th resistance R9
It is adjusted according to actual needs.Second capacitor C2 is compensating electric capacity.Lightning stroke or voltage wave can effectively be inhibited by anti-surge protection circuit 1
The peak voltage of power input caused by dynamic improves security of system, prolongs the service life.
When circuit works normally, since the partial pressure of the 7th resistance R7 acts on, the source voltage of metal-oxide-semiconductor Q3 is greater than grid electricity
Pressure, and it is greater than the cut-in voltage VGS (th) of metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 conducting, the drain-source resistance R of metal-oxide-semiconductor Q3DSVery little, usually only
There are tens milliohms, so the voltage of output end is approximately equal to the voltage of input terminal, equal to the voltage at the 4th both ends electrolytic capacitor C4.
Conducting voltage V due to the partial pressure of the 9th resistance R9 less than the first triode Q1be, the first triode Q1 is in off state.Phase
With, since the partial pressure of first resistor R1 acts on, lead to the voltage U between the base stage and emitter of the second triode Q2be< 0,
So the second triode Q2 is also at off state.
When there is surge voltage in DC power supply, since surge voltage is greater than normal working voltage, surge voltage is first
First to charge to the 4th electrolytic capacitor C4, as the 4th electrolytic capacitor C4 both end voltage increases, the partial pressure of the 9th resistance R9
It is gradually increased, when the partial pressure of the 9th resistance R9 is greater than the conducting voltage V of the first triode Q1be, the first triode Q1 conducting, then
The partial pressure of first resistor R1 and second resistance R2 is greater than the conducting voltage U of the second triode Q2be, the second triode Q2 is also switched on,
Metal-oxide-semiconductor Q3 shutdown, the 4th electrolytic capacitor C4 start powering load.Output voltage VbeFor the base stage and transmitting of the first triode Q1
Pole conducting voltage changes surge protection voltage value by changing the ratio of the 8th resistance R8 and the 9th resistance R9.
When DC power supply restores normal, partial pressure the leading less than the first triode Q1 of the 8th resistance R8 and the 9th resistance R9
The pressure that is powered VbeWhen, the first triode Q1 works in off state, and metal-oxide-semiconductor Q3 is normally open-minded, restores normal power supply.
Metal-oxide-semiconductor Q3 is connected when normal work, the resistance very little between the source electrode and grid of metal-oxide-semiconductor Q3, therefore DC power supply
Output voltage i.e. be equal to load input voltage, in the case where DC power supply is constant, improve load capacity, significantly reduce
Protect the power consumption of circuit；Surge voltage can be restricted to load energy by the resistance value by adjusting the 8th resistance R8 and the 9th resistance R9
It is simple, convenient quick in the voltage range enough born, reduce misuse rate, meanwhile, improve the spirit of protection circuit
Activity and adaptability, convenient for promoting the use of.It is special using the first triode Q1, the conducting of the second triode Q2 and metal-oxide-semiconductor Q3, cut-off
Property, so that the present invention is had self-disabling protection and anti-reverse automatic protection functions.Circuit structure of the invention is simple, volume compared with
It is small, 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, which includes
First benchmark constant-current source I1, the second constant-current source I2, third constant-current source I3, operational amplifier A, current mirror pipe Q4, driving tube Q5,
Booster circuit, eleventh resistor R11, twelfth resistor R12 and the 5th capacitor C5, wherein the first benchmark constant-current source I1 is 20uA
Constant-current source, the second constant-current source I2 be 40uA constant-current source, third constant-current source I3 be 20uA constant-current source.Certainly, it is actually answering
In, the first benchmark constant-current source I1, the second constant-current source I2 and third constant-current source I3 also can choose the constant-current source of other sizes.On
Stating twelfth resistor R12 is current-limiting resistance, carries out overcurrent protection for the non-inverting input terminal to operational amplifier A.5th capacitor
C5 is coupled capacitor, for avoiding the interference between operational amplifier A and current mirror pipe Q4.
The non-inverting input terminal of above-mentioned operational amplifier A is by twelfth resistor R12 respectively with the first benchmark constant-current source I1's
One end is connected with one end of eleventh resistor R11, the reverse input end of the operational amplifier A source electrode with current mirror pipe Q4 respectively
Connected with one end of the 14th resistance R14, the output end of operational amplifier A by the 5th capacitor C5 respectively with current mirror pipe Q4
Grid and the 16th resistance R16 one end connection, current mirror pipe Q4 drain electrode respectively with one end of the second constant-current source I2 and
One end of 15th resistance R15 connects, the other end of the 16th resistance R16 respectively with one end of third constant-current source I2 and driving tube
The grid of Q5 connects, the other end of eleventh resistor R11, the other end of the 14th resistance R14, third constant-current source I3 the other end
With the source grounding of driving tube Q5, the other end of the 15th resistance R15 respectively with one end of LED lamp tube 5, booster circuit it is defeated
Enter end to connect with the drain electrode of driving tube Q5, the output end of booster circuit is connect with the other end of LED lamp tube 5.
The output electric current of constant-current drive circuit 3 can be changed in control circuit 2, to adjust the brightness of the LED illumination downlight.
As shown in figure 3, constant-current drive circuit 3 further includes thirteenth resistor R13 and the 6th capacitor C6, fortune in the present embodiment
Calculate amplifier A reverse input end by thirteenth resistor R13 respectively with one end of the 14th resistance R14 and current mirror pipe Q4
Source electrode connection, the grid of driving tube Q5 connect by the 6th capacitor C6 with the other end of the 16th resistance R16.Wherein, the tenth
Three resistance R13 are current-limiting resistance, are carried out for the direct current between the reverse input end to operational amplifier A and current mirror pipe Q4
Overcurrent protection.6th capacitor C6 is coupled capacitor, for avoiding the interference between operational amplifier A and driving tube Q5.
In the present embodiment, which further includes the 17th resistance R17, and the drain electrode of driving tube Q5 passes through the tenth
Seven resistance R17 are connect with the other end of the 15th resistance R15.17th resistance R17 is current-limiting resistance, for driving tube Q5's
Branch where drain electrode carries out overcurrent protection.
It is noted that above-mentioned current mirror pipe Q4 and driving tube Q5 are N-channel MOS pipe in the present embodiment, when
So, in practical applications, current mirror pipe Q4 and driving tube Q5 are also an option that P-channel metal-oxide-semiconductor, but at this moment constant current driving electricity
The structure on road also will accordingly change.
First benchmark constant-current source I1 generates pressure drop V1, the reference voltage as operational amplifier A on eleventh resistor R11
Its noninverting input is accessed, the output of operational amplifier A is connected to the grid of current mirror pipe Q4, to driving current mirror image pipe
Q4, operational amplifier A, current mirror pipe Q4 and the 14th resistance R14 constitute degeneration factor, in this way on current mirror pipe Q4
The electric current flowed through is equal to the first benchmark constant-current source I1, realizes current mirror pipe Q4 to the accurate of the electric current of the first benchmark constant-current source I1
Duplication.
In the present embodiment, source electrode, the drain and gate of driving tube Q5 and current mirror pipe Q4 are in identical circuit
In state, i.e., the pressure difference between the pressure difference between the grid and source electrode of driving tube Q5 and the grid and source electrode of current mirror pipe Q4 is complete
Complete equal, the pressure difference between the pressure difference between the drain electrode and source electrode of driving tube Q5 and the drain electrode and source electrode of current mirror pipe Q4 is complete
It is equal.This ensures that driving tube Q5 amplifies the exact mirror image of electric current on current mirror pipe Q4.
In the present embodiment, the drain voltage of driving tube Q5 is limited at the Vdsat (max) of booster circuit.Pass through boosting
Voltage difference between the drain electrode and source electrode of circuit acquisition driving tube Q5 makes LED lamp tube 5 to adjust the voltage of LED lamp tube 5
Voltage reaches optimum value, to make the voltage difference between the drain electrode and source electrode of driving tube Q5 close to saturation pressure depreciation, further drops
Low-power consumption.
As shown in Fig. 2, above-mentioned anti-surge protection circuit 1 further includes the 4th resistance R4, the collector of the second triode Q2 is logical
The 4th resistance R4 is crossed to connect with input anode Vi+.4th resistance R4 is current-limiting resistance, for the transmitting to the second triode Q2
Branch where pole carries out overcurrent protection.In the present embodiment, which further includes the 5th resistance R5, pressure stabilizing two
The cathode of pole pipe ZD1 is connect by the 5th resistance R5 with input anode Vi+.5th resistance R5 is current-limiting resistance, for steady
Branch where pressing diode ZD1 carries out overcurrent protection.
In the present embodiment, which further includes third capacitor C3, the collector of the second triode Q2 and
One end of three capacitor C3 connects, and the other end of third capacitor C3 is connect with the grid of metal-oxide-semiconductor Q3.Third capacitor C3 is coupling electricity
Hold, for avoiding the interference between the second triode Q2 and third transistor Q3.
In the present embodiment, which further includes the tenth resistance R10, the base stage of the first triode Q1 and the
One end of ten resistance R10 connects, the other end of the tenth resistance R10 respectively with one end of the 8th resistance R8 and the 9th resistance R9 one
End connection.Tenth resistance R10 is current-limiting resistance, for carrying out overcurrent protection to the branch where the first triode Q1.
In short, in the present embodiment, after system electrification, 220V alternating current passes through the rectification and filtering of current rectifying and wave filtering circuit 2
After be converted into direct current, to constant-current drive circuit 3 power.Constant-current drive circuit 3 works normally, can be by opening multiple open step by step
It closes, successively lights all downlights for being serially connected in LED lamp tube 5 therein, realize high-efficiency high-power-factor.In the present embodiment, on
It states and control button (not shown) can be set on lamp body, by pressing control button come adjusting control circuit 4, to change
The output electric current of constant-current drive circuit 3, the thus brightness of the adjustable LED illumination downlight.Pass through anti-surge protection circuit 1
The peak voltage that can be effectively generated in suppression circuit due to lightning stroke or voltage fluctuation, reaches lightning protection effect, improves system safety
Property, prolong the service life.Can be maximized by constant-current drive circuit 3 reduces circuit power consumption, and realizes that electric current exact mirror image amplifies,
Improve chip load capacity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of LED illumination downlight with protection constant current driving, which is characterized in that including lamp body, the lamp body includes wave resistance
Gush protection circuit, current rectifying and wave filtering circuit, constant-current drive circuit, control circuit and LED lamp tube, it is the anti-surge protection circuit, whole
Stream filter circuit, constant-current drive circuit and LED lamp tube are sequentially connected in series, and the control circuit is connect with the constant-current drive circuit,
The anti-surge protection circuit include first resistor, second resistance, 3rd resistor, the 6th resistance, the 7th resistance, the 8th resistance,
9th resistance, first capacitor, the second capacitor, the 4th electrolytic capacitor, the first triode, the second triode, metal-oxide-semiconductor and voltage-stabiliser tube,
One end of the first resistor connects input anode, the other end of first resistor one end with the second resistance respectively
It being connected with one end of first capacitor, the other end of the second resistance is connect with the collector of first triode, and described
The emitter of one triode connects input cathode, the other end of the first capacitor and described second by the 3rd resistor
The base stage of triode connects, the collector of second triode respectively with the anode of the voltage-stabiliser tube, the 6th resistance one end,
One end of 7th resistance is connected with the grid of metal-oxide-semiconductor, the emitter of second triode, the cathode of voltage-stabiliser tube, the 7th resistance
The other end and the source electrode of metal-oxide-semiconductor be all connected with the input anode, the base stage of first triode is respectively with described second
One end of capacitor, the 8th resistance one end connected with one end of the 9th resistance, the other end of second capacitor, the 6th resistance
The other end of the other end and the 9th resistance is all connected with the input cathode, the other end and the metal-oxide-semiconductor of the 8th resistance
Drain electrode connection, one end of the 4th electrolytic capacitor is connect with the other end of the 8th resistance and output head anode, described
The other end of 4th electrolytic capacitor is connect with the other end of the 9th resistance and negative pole of output end；The constant-current drive circuit packet
Include the first benchmark constant-current source, the second constant-current source, third constant-current source, operational amplifier, current mirror pipe, driving tube, booster circuit,
The non-inverting input terminal of eleventh resistor, twelfth resistor and the 5th capacitor, the operational amplifier passes through the twelfth resistor
It is connect respectively with one end of one end of the first benchmark constant-current source and eleventh resistor, the reversed input of the operational amplifier
End is connect with one end of the source electrode of the current mirror pipe and the 14th resistance respectively, and the output end of the operational amplifier passes through
5th capacitor is connect with one end of the grid of the current mirror pipe and the 16th resistance respectively, the current mirror pipe
Drain electrode is connect with one end of one end of second constant-current source and the 15th resistance respectively, the other end point of the 16th resistance
It is not connect with the grid of one end of the third constant-current source and driving tube, the other end of the eleventh resistor, the 14th resistance
The other end, the other end of third constant-current source and the source grounding of driving tube, the other end of the 15th resistance respectively with
One end of the LED lamp tube, the input terminal of booster circuit are connected with the drain electrode of driving tube, the output end of the booster circuit and institute
State the other end connection of LED lamp tube；
The constant-current drive circuit further includes thirteenth resistor and the 6th capacitor, and the reverse input end of the operational amplifier passes through
The thirteenth resistor is connect with the source electrode of one end of the 14th resistance and current mirror pipe respectively, the grid of the driving tube
Pole is connect by the 6th capacitor with the other end of the 16th resistance；
The constant-current drive circuit further includes the 17th resistance, the drain electrode of the driving tube by the 17th resistance with it is described
The other end of 15th resistance connects；
When surge voltage occurs in DC power supply, surge voltage is greater than normal working voltage, and surge voltage first has to the 4th electricity
Solution capacitor charges, and as the 4th electrolytic capacitor both end voltage increases, the partial pressure of the 9th resistance is gradually increased, when the 9th resistance
Partial pressure be greater than the first triode conducting voltage, the first triode ON, then the partial pressure of first resistor and second resistance is big
In the conducting voltage of the second triode, the second triode is also switched on, and metal-oxide-semiconductor shutdown, the 4th electrolytic capacitor starts powering load；
Output voltage is the base stage and emitter conducting voltage of the first triode, by change the ratio of the 8th resistance and the 9th resistance come
Change surge protection voltage value；
When DC power supply restores normal, the partial pressure of the 8th resistance and the 9th resistance less than the first triode conducting voltage when,
For first triode operation in off state, metal-oxide-semiconductor is normally open-minded, restores normal power supply.
2. the LED illumination downlight with protection constant current driving according to claim 1, which is characterized in that the Anti-surging
Protecting circuit further includes the 4th resistance, and the collector of second triode passes through the 4th resistance and the input anode
Connection.
3. the LED illumination downlight with protection constant current driving according to claim 2, which is characterized in that the Anti-surging
Protection circuit further includes the 5th resistance, and the cathode of the zener diode is connected by the 5th resistance and the input anode
It connects.
4. the LED illumination downlight with protection constant current driving according to claim 3, which is characterized in that the Anti-surging
Protecting circuit further includes third capacitor, and the collector of second triode is connect with one end of the third capacitor, and described the
The other end of three capacitors is connect with the grid of the metal-oxide-semiconductor.
5. the LED illumination downlight with protection constant current driving according to claim 4, which is characterized in that the Anti-surging
Protecting circuit further includes the tenth resistance, and the base stage of first triode is connect with one end of the tenth resistance, and the described tenth
The other end of resistance is connect with one end of one end of the 8th resistance and the 9th resistance respectively.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN106322321B true CN106322321B (en) | 2019-10-18 |
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| CN107993618B (en) * | 2017-11-01 | 2020-09-29 | 昆山龙腾光电股份有限公司 | Level generating circuit of display device |
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| CN107846759B (en) * | 2017-12-12 | 2024-01-05 | 上海灿瑞科技股份有限公司 | LED driving 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 |
| CN108683167B (en) * | 2018-07-03 | 2024-04-09 | 苏州锴威特半导体股份有限公司 | Anti-surge circuit of PD equipment |
| CN108848594B (en) * | 2018-07-11 | 2024-08-06 | 上海艾为电子技术股份有限公司 | LED drive circuit and multi-path LED lighting system |
| CN109474361B (en) * | 2018-12-06 | 2020-05-19 | 广州荣锋电子科技有限公司 | Sound console |
| CN109618466B (en) * | 2019-01-21 | 2024-02-20 | 广东基地灯饰有限公司 | LED drive circuit based on power tube safety 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 |
| 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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| CN106322321A (en) | 2017-01-11 |
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