CN108055732A - The current constant control protection circuit of classroom blackboard LED light strip - Google Patents
The current constant control protection circuit of classroom blackboard LED light strip Download PDFInfo
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- CN108055732A CN108055732A CN201711465041.8A CN201711465041A CN108055732A CN 108055732 A CN108055732 A CN 108055732A CN 201711465041 A CN201711465041 A CN 201711465041A CN 108055732 A CN108055732 A CN 108055732A
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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]
Abstract
A kind of current constant control the invention discloses classroom blackboard LED light strip protects circuit; including power supply, anti-reverse power connection circuit, energy storage filter circuit, constant-current control circuit, output ballasting circuit and sampling protection circuit; anti- reverse power connection circuit is connected with power supply; energy storage filter circuit is connected with anti-reverse power connection circuit; constant-current control circuit is connected with energy storage filter circuit; output ballasting circuit is connected with constant-current control circuit, and sampling protection circuit is connected respectively with classroom blackboard LED light strip and constant-current control circuit；Constant-current control circuit includes control signal input, DC supply input, the first triode, the second triode, first resistor, the first capacitance and the second capacitance.Implement the current constant control protection circuit of the classroom blackboard LED light strip of the present invention, have the advantages that：Circuit structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Description
Technical field
The present invention relates to education sector, the current constant control protection circuit of more particularly to a kind of classroom blackboard LED light strip.
Background technology
Classroom blackboard LED light strip is the lamps and lanterns that a professional application is illuminated in classroom blackboard.It is positioned at classroom, sound
The environment occasions such as happy classroom, natural classroom, scientific and technological classroom, Psychological Counseling Room, office, meeting room, fine arts room, laboratory make
With alternative original use fluorescent tube illuminates place.It is designed using environmentally friendly new and high technology LED light source and special optical, makes this
Lamp becomes the lamps and lanterns with lamps that combines together such as anti-dazzle, high energy saving, corrosion-resistant and graceful curve modelings.Classroom blackboard LED light
The driving that band is required to driving circuit could work normally, and the internal circuit configuration of traditional classroom blackboard LED light strip is more multiple
Miscellaneous, hardware cost is higher.In addition, the internal circuit of traditional classroom blackboard LED light strip is due to lacking corresponding circuit protection work(
Can, the safety and reliability for causing circuit is not high.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provide a kind of circuit structure compared with
Circuit is protected for the current constant control of classroom blackboard LED light strip simple, that cost is relatively low, the safety and reliability of circuit is higher.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of constant current of classroom blackboard LED light strip
Control protection electric circuit, including power supply, anti-reverse power connection circuit, energy storage filter circuit, constant-current control circuit, output ballast electricity
Road and sampling protection circuit, the anti-reverse power connection circuit is connected with the power supply, the energy storage filter circuit with it is described
The connection of anti-reverse power connection circuit, for filtering out the electromagnetic interference in the power supply of the anti-reverse power connection circuit output and in the confession
There is provided instantaneous power during electric power cut-off, the constant-current control circuit is connected with the energy storage filter circuit, for by the storage
The power supply of energy filter circuit output provides constant electric current, the output for classroom blackboard LED light strip after being coordinated and being controlled
Ballasting circuit is connected with the constant-current control circuit, the constant-current supply for the constant-current control circuit to be exported is carried out at ballast
Reason provides stable voltage for the classroom blackboard LED light strip, the sampling protect circuit respectively with the classroom blackboard LED
Light bar connects with constant-current control circuit, for gathering the electric current of the classroom blackboard LED light strip output and send it to described
Constant-current control circuit；
The constant-current control circuit includes control signal input, DC supply input, the first triode, the two or three pole
Pipe, first resistor, the first capacitance and the second capacitance, the control signal input respectively with the energy storage filter circuit, second
One end of capacitance is connected with the collector of the second triode, the base stage of the other end of second capacitance and first triode
Connection, the collector of first triode is connected with one end of the output ballasting circuit, described to export the another of ballasting circuit
One end is connected respectively with one end of first capacitance and DC supply input, the other end ground connection of first capacitance, institute
State the emitter ground connection of the second triode, the base stage of second triode respectively with the emitter of first triode and the
One end connection of one resistance, the other end ground connection of the first resistor, the capacitance of second capacitance is 390pF.
In the current constant control protection circuit of classroom blackboard LED light strip of the present invention, the constant-current control circuit is also
Including the 3rd capacitance, one end of the 3rd capacitance is connected with the base stage of second triode, the 3rd capacitance it is another
One end respectively with the emitter of first triode and first resistor is held to be connected, the capacitance of the 3rd capacitance is
620pF。
In the current constant control protection circuit of classroom blackboard LED light strip of the present invention, the constant-current control circuit is also
Including second resistance, one end of the second resistance is connected with the emitter of second triode, the second resistance it is another
One end is grounded, and the resistance value of the second resistance is 27k Ω.
In the current constant control protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit bag
Include fuse, bridge rectifier, the 9th resistance, the tenth resistance, the 11st resistance, the 6th diode, the 7th diode, the 4th
Triode, the 5th triode, the 8th capacitance, the 9th electrolytic capacitor, the tenth electrolytic capacitor, the 11st capacitance, the 12nd capacitance and
Thyristor, one end of the fuse are connected with one end of the classroom blackboard LED light strip, the other end of the fuse and institute
State the input terminal connection of bridge rectifier, another input terminal and the classroom blackboard of the bridge rectifier
The other end connection of LED light strip, the positive output end of the bridge rectifier respectively with the anode of the 8th electrolytic capacitor, the
The emitter connection of one end of nine resistance, the anode of the 9th electrolytic capacitor and the 5th triode, the 8th electrolytic capacitor are born
Pole is connected with the negative output terminal of the bridge rectifier, the other end of the 9th resistance respectively with the 4th triode
Base stage is connected with the cathode of the 6th diode, and the anode of the 6th diode is connected with the cathode of the 8th electrolytic capacitor,
The cathode of 9th electrolytic capacitor is connected with the emitter of the 4th triode；
The base stage of 5th triode by the 12nd capacitance respectively with the collector of the 4th triode and
One end connection of tenth resistance, the other end of the tenth resistance are connected with the anode of the 6th diode, and the described 5th 3
Anode of the collector of pole pipe respectively with the anode of the thyristor, the anode of the tenth electrolytic capacitor and the 7th diode is connected,
The one end of the cathode of the thyristor respectively with the other end of the tenth resistance and the 11st resistance is connected, the thyristor
The other end of the control pole respectively with the cathode of the tenth electrolytic capacitor and the 11st resistance is connected, the 11st electrolytic capacitor
One end respectively with the cathode of the 7th diode and constant-current control circuit of anode be connected, the 11st electrolytic capacitor
The other end of the cathode respectively with the other end of the 11st resistance and constant-current control circuit is connected, the electricity of the 12nd capacitance
Capacitance is 220pF.
In the current constant control protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit is also
Including the 12nd resistance, one end of the 12nd resistance is connected with the cathode of the thyristor, the 12nd resistance it is another
One end is connected with the other end of the tenth resistance, and the resistance value of the 12nd resistance is 30k Ω.
In the current constant control protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit is also
Including the 13rd resistance, one end of the 13rd resistance is connected with the collector of the 5th triode, the 13rd electricity
The other end of resistance is connected with the anode of the tenth electrolytic capacitor, and the resistance value of the 13rd resistance is 47k Ω.
Implement the current constant control protection circuit of the classroom blackboard LED light strip of the present invention, have the advantages that：Due to setting
There are power supply, anti-reverse power connection circuit, energy storage filter circuit, constant-current control circuit, output ballasting circuit and sampling protection electricity
Road, constant-current control circuit include control signal input, DC supply input, the first triode, the second triode, the first electricity
Resistance, the first capacitance and the second capacitance, the constant-current control circuit compared with traditional constant-current control circuit, the component used compared with
It is few, hardware cost can be so reduced, in addition, the second capacitance is used to prevent between the first triode Q1 and the second triode Q2
Interference, therefore line structure is relatively simple, cost is relatively low, the safety and reliability of circuit is higher.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is that the current constant control of classroom blackboard LED light strip of the present invention protects the structure diagram in circuit one embodiment；
Fig. 2 is the circuit diagram of constant-current control circuit in the embodiment；
Fig. 3 is the circuit diagram of sampling protection circuit in the embodiment.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
In the current constant control protection circuit embodiments of classroom blackboard LED light strip of the present invention, the classroom blackboard LED light strip
The structure diagram of current constant control protection circuit is as shown in Figure 1.In Fig. 1, the current constant control protection electricity of the classroom blackboard LED light strip
Road includes power supply 1, anti-reverse power connection circuit 2, energy storage filter circuit 3, constant-current control circuit 4, output ballasting circuit 5 and adopts
Sample protects circuit 6, wherein, anti-reverse power connection circuit 2 is connected with power supply 1, energy storage filter circuit 3 and anti-reverse power connection circuit
2 connections, for filtering out the electromagnetic interference in the power supply that anti-reverse power connection circuit 2 exports and provide wink when power supply 1 powers off
Between power supply, constant-current control circuit 4 is connected with energy storage filter circuit 3, the power supply for energy storage filter circuit 3 to be exported is coordinated
With constant electric current is provided after control for classroom blackboard LED light strip, output ballasting circuit 5 is connected with constant-current control circuit 4, is used for
The constant-current supply that constant-current control circuit 4 is exported carries out ballast processing, and stable voltage is provided for classroom blackboard LED light strip, is adopted
Sample protection circuit 6 is connected with classroom blackboard LED light strip and constant-current control circuit 4, is defeated for gathering classroom blackboard LED light strip respectively
The electric current that goes out simultaneously sends it to constant-current control circuit 4.Sampling protection circuit 6 can be played when short circuit occurs in constant-current control circuit 4
When protect circuit in electronic component effect.
Fig. 2 is the circuit diagram of constant-current control circuit in the present embodiment, and in Fig. 2, which includes control
Signal input part A, DC supply input Vin, the first triode Q1, the second triode Q2, first resistor R1, the first capacitance C1
With the second capacitance C2, wherein, control signal input A respectively with one end of the second capacitance C2 and the collector of the second triode Q2
Connection, control signal input A also with energy storage filter circuit 3 connects, the other end of the second capacitance C2 and the first triode Q1's
Base stage connects, and the collector of the first triode Q1 is connected with exporting one end of ballasting circuit 5, exports the other end of ballasting circuit 5
It is connected respectively with one end of the first capacitance C1 and DC supply input Vin, the other end ground connection of the first capacitance C1, the two or three pole
The emitter ground connection of pipe Q2, the base stage of the second triode Q2 respectively with the emitter of the first triode Q1 and first resistor R1 one
End connection, the other end ground connection of first resistor R1.
For the constant-current control circuit 4 compared with traditional constant-current control circuit, the component used is less, circuit structure compared with
To be simple, hardware cost can be so reduced.Second capacitance C2 is coupled capacitor, for preventing the first triode Q1 and the two or three
Interference between pole pipe Q2, therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment, the second electricity
Hold the capacitance of C2 for 390pF, certainly, in practical applications, the capacitance of the second capacitance C2 can carry out as the case may be
Corresponding adjustment.
DC supply input Vin receives a DC voltage so that the constant-current control circuit 4 works.Energy storage filter circuit 3
In be equipped with microprocessor, which can generate the control signal of specific frequency, and control signal input A receives the specific frequency
The control signal of rate, and the control signal of the specific frequency is sent to the first triode Q1, the first triode Q1 and passes through its base
Pole receives the control signal of specific frequency, and the control signal of the specific frequency makes the first triode Q1 turned off with specific frequency
Switch between state and opening state.The control signal of specific frequency can be pwm signal.
If the voltage fluctuation inputted from DC supply input Vin is larger, the first capacitance C1 can store electric energy, reduce electricity
It can loss；When the voltage inputted from DC supply input Vin becomes larger, the first capacitance C1 storage electric energy, when from DC power supply
The voltage of input terminal Vin inputs becomes hour, the first capacitance C1 release electric energy, and output ballasting circuit 5 is powered.
In the present embodiment, which further includes the first diode D1, the anode and direct current of the first diode D1
Power input Vin connections, the cathode of the first diode D1 are another with one end of the first capacitance C1 and output ballasting circuit 5 respectively
One end connects, and the first diode D1 is Current Limiting Diodes, for carrying out current-limiting protection to the collector current of the first triode Q1,
To further enhance the safety and reliability of circuit.It is noted that in the present embodiment, the model of the first diode D1
S-701, certainly, in practical applications, the first diode D1 can select diode of other models with similar functions.
In the present embodiment, which further includes the 3rd capacitance C3, one end and the two or three pole of the 3rd capacitance C3
The base stage connection of pipe Q2, the other end of the 3rd capacitance C3 one end with the emitter of the first triode Q1 and first resistor R1 respectively
Connection.3rd capacitance C3 is coupled capacitor, for further preventing the interference between the first triode Q1 and the second triode Q2,
Further to enhance the safety and reliability of circuit.It is noted that in the present embodiment, the capacitance of the 3rd capacitance C3
For 620pF, certainly, in practical applications, the capacitance of the 3rd capacitance C3 can also adjust accordingly as the case may be.
In the present embodiment, which further includes second resistance R2, one end of second resistance R2 and the two or three pole
The emitter connection of pipe Q2, the other end ground connection of second resistance R2.Second resistance R2 is current-limiting resistance, for further enhancing limit
Flow effect.It is noted that in the present embodiment, the resistance value of second resistance R2 is 27k Ω, certainly, in practical applications, second
The resistance value of resistance R2 can adjust accordingly as the case may be.
Fig. 3 is that the circuit diagram for protecting circuit is sampled in the present embodiment, and in Fig. 3, sampling protection circuit 6 includes fusing
Device FU, bridge rectifier T, the 9th resistance R9, the tenth resistance R10, the 11st resistance R11, the 6th diode D6, the seven or two pole
Pipe D7, the 4th triode Q4, the 5th triode Q5, the 8th capacitance C8, the 9th electrolytic capacitor C9, the tenth electrolytic capacitor C10, the tenth
One capacitance C11, the 12nd capacitance C12 and thyristor VS, one end of fuse FU are connected with one end of classroom blackboard LED light strip,
The other end of fuse FU is connected with an input terminal of bridge rectifier T, another input terminal of bridge rectifier T with
The other end connection of classroom blackboard LED light strip, the positive output end of bridge rectifier T respectively with the 8th electrolytic capacitor C8 just
Pole, the emitter connection of one end of the 9th resistance R9, the anode of the 9th electrolytic capacitor C9 and the 5th triode Q5, the 8th electrolysis electricity
The cathode for holding C8 is connected with the negative output terminal of bridge rectifier T, the other end of the 9th resistance R9 respectively with the 4th triode Q4
Base stage connected with the cathode of the 6th diode D6, the anode of the 6th diode D6 is connected with the cathode of the 8th electrolytic capacitor C8,
The cathode of 9th electrolytic capacitor C9 is connected with the emitter of the 4th triode Q4.
The base stage of 5th triode Q5 is electric with the collector of the 4th triode Q4 and the tenth respectively by the 12nd capacitance C12
One end connection of R10 is hindered, the other end of the tenth resistance R10 is connected with the anode of the 6th diode D6, the collection of the 5th triode Q5
Anode of the electrode respectively with the anode of thyristor VS, the anode of the tenth electrolytic capacitor C10 and the 7th diode D7 is connected, thyristor
The one end of the cathode of VS respectively with the other end of the tenth resistance R10 and the 11st resistance R11 is connected, the control pole point of thyristor VS
The other end not with the cathode of the tenth electrolytic capacitor C10 and the 11st resistance R11 is connected, the anode of the 11st electrolytic capacitor C11
One end with the cathode of the 7th diode D7 and constant-current control circuit 4 is connected respectively, the cathode difference of the 11st electrolytic capacitor C11
It is connected with the other end of the 11st resistance R11 and the other end of constant-current control circuit 4.
The sampling protects circuit 6 to protect circuit compared with traditional sampling, and the component used is less, circuit structure compared with
To be simple, hardware cost can be so reduced.In addition, the 12nd capacitance C12 is coupled capacitor, for preventing the 4th triode Q4
With the interference between the 5th triode Q5, to further enhance the safety and reliability of circuit.It is noted that this implementation
In example, the capacitance of the 12nd capacitance C12 is 220pF, and certainly, in practical applications, the capacitance of the 12nd capacitance C12 can be with
It adjusts accordingly as the case may be.
In use, when current overload, the pressure drop increase of the 11st resistance R11, thyristor VS conductings make high current direct
The protection circuit of the compositions such as the 9th resistance R9 and thyristor VS is flowed through, fuse FU is made to fuse, so as to protect power supply electricity rapidly
Source 1 is not damaged.During normal use, bridge rectifier T, the 8th electrolytic capacitor C8, the 4th triode Q4, the 5th triode Q5
And the 6th the current rectifying and wave filtering circuits of the compositions such as diode D6 can guarantee the stable operation of entire circuit.
In the present embodiment, sampling protection circuit 6 further includes the 12nd resistance R12, one end and the crystalline substance of the 12nd resistance R12
The cathode connection of brake tube VS, the other end of the 12nd resistance R12 are connected with the other end of the tenth resistance R10.12nd resistance R12
For current-limiting resistance, for carrying out route protection to the branch where thyristor VS, with further enhance the security of circuit and
Reliability.It is noted that in the present embodiment, the resistance value of the 12nd resistance R12 is 30k Ω, certainly, in practical applications,
The resistance value of 12nd resistance R12 can also adjust accordingly as the case may be.
In the present embodiment, the sampling protection sampling protection circuit of circuit 6 further includes the 13rd resistance R13, the 13rd resistance
One end of R13 is connected with the collector of the 5th triode Q5, the other end of the 13rd resistance R13 and the tenth electrolytic capacitor C10's
Anode connects.13rd resistance R13 is current-limiting resistance, for limiting the branch between thyristor VS and the 7th diode D7
Stream protection, to further enhance current limitation effect.It is noted that in the present embodiment, the resistance value of the 13rd resistance R13 is 47k
Ω, certainly, in practical applications, the resistance value of the 13rd resistance R13 can adjust accordingly as the case may be.
Existing structure may be employed in above-mentioned anti-reverse power connection circuit 2, energy storage filter circuit 3 and output ballasting circuit 5.
In short, in the present embodiment, the constant-current control circuit 4 is compared with traditional constant-current control circuit, the first device used
Part is less, and circuit structure is relatively simple, can so reduce hardware cost, and coupling electricity is in addition equipped in the constant-current control circuit 4
Hold, therefore the safety and reliability of circuit is higher.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (7)
1. the current constant control protection circuit of a kind of classroom blackboard LED light strip, which is characterized in that anti-including power supply, anti-power supply
Connect circuit, energy storage filter circuit, constant-current control circuit, output ballasting circuit and sampling protection circuit, the anti-reverse power connection electricity
Road is connected with the power supply, and the energy storage filter circuit is connected with the anti-reverse power connection circuit, is described anti-for filtering out
Electromagnetic interference in the power supply of reverse power connection circuit output simultaneously provides instantaneous power, the constant current when the power supply powers off
Control circuit is connected with the energy storage filter circuit, the power supply for the energy storage filter circuit to be exported is coordinated and is controlled
Constant electric current is provided for classroom blackboard LED light strip afterwards, the output ballasting circuit is connected with the constant-current control circuit, is used for
The constant-current supply that the constant-current control circuit is exported carries out ballast processing, is provided for the classroom blackboard LED light strip stable
Voltage, the sampling protection circuit are connected with the classroom blackboard LED light strip and constant-current control circuit, are described for gathering respectively
The electric current of classroom blackboard LED light strip output simultaneously sends it to the constant-current control circuit；
The constant-current control circuit include control signal input, DC supply input, the first triode, the second triode,
First resistor, the first capacitance and the second capacitance, the control signal input respectively with the energy storage filter circuit, the second capacitance
One end connected with the collector of the second triode, the base stage of the other end of second capacitance and first triode connects
It connects, the collector of first triode is connected with one end of the output ballasting circuit, described to export the another of ballasting circuit
End is connected respectively with one end of first capacitance and DC supply input, the other end ground connection of first capacitance, described
The emitter ground connection of second triode, the base stage of second triode emitter and first with first triode respectively
One end connection of resistance, the other end ground connection of the first resistor, the capacitance of second capacitance is 390pF.
2. the current constant control protection circuit of classroom blackboard LED light strip according to claim 1, which is characterized in that the perseverance
Flow control circuit further includes the first diode, and the anode of first diode is connected with the DC supply input, described
The other end of the cathode of first diode respectively with one end of first capacitance and output ballasting circuit is connected, and the described 1st
The model S-701 of pole pipe.
3. the current constant control protection circuit of classroom blackboard LED light strip according to claim 2, which is characterized in that the perseverance
Flow control circuit further includes the 3rd capacitance, and one end of the 3rd capacitance is connected with the base stage of second triode, and described
The one end of the other end of three capacitances respectively with the emitter of first triode and first resistor is connected, the 3rd capacitance
Capacitance is 620pF.
4. the current constant control protection circuit of classroom blackboard LED light strip according to claim 3, which is characterized in that the perseverance
Flow control circuit further includes second resistance, and one end of the second resistance is connected with the emitter of second triode, described
The other end ground connection of second resistance, the resistance value of the second resistance is 27k Ω.
5. the current constant control protection circuit of classroom blackboard LED light strip according to any one of claims 1 to 4, feature
It is, the sampling protection circuit includes fuse, bridge rectifier, the 9th resistance, the tenth resistance, the 11st resistance, the
Six diodes, the 7th diode, the 4th triode, the 5th triode, the 8th capacitance, the 9th electrolytic capacitor, the tenth electrolytic capacitor,
11st capacitance, the 12nd capacitance and thyristor, one end of the fuse and one end of the classroom blackboard LED light strip connect
Connect, the other end of the fuse is connected with an input terminal of the bridge rectifier, the bridge rectifier it is another
One input terminal is connected with the other end of the classroom blackboard LED light strip, the positive output end of the bridge rectifier respectively with
Anode, one end, the anode of the 9th electrolytic capacitor and the emitter of the 5th triode of the 9th resistance of 8th electrolytic capacitor
Connection, the cathode of the 8th electrolytic capacitor is connected with the negative output terminal of the bridge rectifier, the 9th resistance it is another
Cathode of the one end respectively with the base stage of the 4th triode and the 6th diode is connected, the anode of the 6th diode and institute
The cathode connection of the 8th electrolytic capacitor is stated, the cathode of the 9th electrolytic capacitor is connected with the emitter of the 4th triode；
The base stage of 5th triode passes through the 12nd capacitance collector and the tenth with the 4th triode respectively
One end connection of resistance, the other end of the tenth resistance are connected with the anode of the 6th diode, the 5th triode
Anode of the collector respectively with the anode of the thyristor, the anode of the tenth electrolytic capacitor and the 7th diode be connected, it is described
The one end of the cathode of thyristor respectively with the other end of the tenth resistance and the 11st resistance is connected, the control of the thyristor
The other end of the pole respectively with the cathode of the tenth electrolytic capacitor and the 11st resistance is connected, and the 11st electrolytic capacitor is just
The one end of pole respectively with the cathode of the 7th diode and constant-current control circuit is connected, the cathode of the 11st electrolytic capacitor
The other end with the other end of the 11st resistance and constant-current control circuit is connected respectively, the capacitance of the 12nd capacitance
For 220pF.
6. the current constant control protection circuit of classroom blackboard LED light strip according to claim 5, which is characterized in that described to adopt
Sample protection circuit further includes the 12nd resistance, and one end of the 12nd resistance is connected with the cathode of the thyristor, and described the
The other end of 12 resistance is connected with the other end of the tenth resistance, and the resistance value of the 12nd resistance is 30k Ω.
7. the current constant control protection circuit of classroom blackboard LED light strip according to claim 6, which is characterized in that described to adopt
Sample protection circuit further includes the 13rd resistance, and one end of the 13rd resistance is connected with the collector of the 5th triode,
The other end of 13rd resistance is connected with the anode of the tenth electrolytic capacitor, and the resistance value of the 13rd resistance is 47k
Ω。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465041.8A CN108055732A (en) | 2017-12-28 | 2017-12-28 | The current constant control protection circuit of classroom blackboard LED light strip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465041.8A CN108055732A (en) | 2017-12-28 | 2017-12-28 | The current constant control protection circuit of classroom blackboard LED light strip |
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| CN108055732A true CN108055732A (en) | 2018-05-18 |
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| CN201711465041.8A Pending CN108055732A (en) | 2017-12-28 | 2017-12-28 | The current constant control protection circuit of classroom blackboard LED light strip |
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| CN204205548U (en) * | 2014-12-09 | 2015-03-11 | 深圳市东方之星电源有限公司 | Circuit overcurrent protection |
| CN104540296A (en) * | 2015-01-08 | 2015-04-22 | 福建思科通电子科技有限公司 | Compatible LED intelligent fluorescent lamp tube and control method thereof |
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| CN101861005A (en) * | 2010-04-01 | 2010-10-13 | 海洋王照明科技股份有限公司 | LED drive circuit and portable lamp |
| CN201708975U (en) * | 2010-06-22 | 2011-01-12 | 刘昌贵 | Constant current source circuit |
| CN102386756A (en) * | 2011-11-20 | 2012-03-21 | 任永斌 | Power frequency switching power supply |
| CN202798489U (en) * | 2012-03-06 | 2013-03-13 | 钭惠星 | Low-power-consumption no-isolation direct current (dc) source |
| CN204205548U (en) * | 2014-12-09 | 2015-03-11 | 深圳市东方之星电源有限公司 | Circuit overcurrent protection |
| CN104540296A (en) * | 2015-01-08 | 2015-04-22 | 福建思科通电子科技有限公司 | Compatible LED intelligent fluorescent lamp tube and control method thereof |
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