CN107949119A - Classroom blackboard LED light strip drive circuit - Google Patents
Classroom blackboard LED light strip drive circuit Download PDFInfo
- Publication number
- CN107949119A CN107949119A CN201711465042.2A CN201711465042A CN107949119A CN 107949119 A CN107949119 A CN 107949119A CN 201711465042 A CN201711465042 A CN 201711465042A CN 107949119 A CN107949119 A CN 107949119A
- Authority
- CN
- China
- Prior art keywords
- resistance
- diode
- capacitance
- led light
- light strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Led Devices (AREA)
Abstract
The invention discloses a kind of classroom blackboard LED light strip drive circuit, including bridge rectifier, voltage detecting circuit, power supply circuit, microcontroller and power conditioning circuitry, the positive output end of the bridge rectifier input terminal with voltage detecting circuit respectively, the input terminal of power supply circuit is connected with the positive input terminal of blackboard LED light strip, the output terminal of voltage detecting circuit and the output terminal of power supply circuit are connected with microcontroller, the output terminal of microcontroller and the signal control terminal of power conditioning circuitry connect, the negative output terminal of bridge rectifier and the input terminal of power conditioning circuitry connect, the output terminal of power conditioning circuitry is connected with the negative input end of blackboard LED light strip；Voltage detecting circuit includes first resistor, second resistance, 3rd resistor, photoelectrical coupler, the first electrolytic capacitor, the second capacitance, the first power supply and the first output terminal.Circuit structure of the present invention 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, more particularly to a kind of classroom blackboard LED light strip drive circuit.
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, it is alternative originally using fluorescent tube illumination place.Designed using environmentally friendly new and high technology LED light source and special optical, make 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 drive circuit could work normally, and the driving circuit structure of traditional classroom blackboard LED light strip is more multiple
Miscellaneous, hardware cost is higher.In addition, the drive circuit of traditional classroom blackboard LED light strip is due to lacking corresponding circuit protection work(
Can, cause the safety and reliability of circuit 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, there is provided a kind of circuit structure compared with
For classroom blackboard LED light strip drive circuit 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 classroom blackboard LED light strip driving electricity
Road, including bridge rectifier, voltage detecting circuit, power supply circuit, microcontroller and power conditioning circuitry, the bridge rectifier
Circuit an input terminal connection 220V alternating currents one end, the bridge rectifier another input terminal connection described in
The other end of 220V alternating currents, the positive output end of the bridge rectifier respectively the input terminal with the voltage detecting circuit,
The input terminal of power supply circuit is connected with the positive input terminal of blackboard LED light strip, the output terminal and power supply electricity of the voltage detecting circuit
The output terminal on road is connected with the microcontroller, the signal control of the output terminal of the microcontroller and the power conditioning circuitry
End connection processed, the negative output terminal of the bridge rectifier are connected with the input terminal of the power conditioning circuitry, the power tune
The output terminal on economize on electricity road is connected with the negative input end of the blackboard LED light strip；
The voltage detecting circuit includes first resistor, second resistance, 3rd resistor, photoelectrical coupler, the first electrolysis electricity
Appearance, the second capacitance, the first power supply and the first output terminal, the cathode of first electrolytic capacitor respectively with the bridge rectifier
The positive output end of circuit is connected with the first pin of photoelectrical coupler, the anode ground connection of first electrolytic capacitor, and described first
One end of resistance is connected with the second pin of the photoelectrical coupler, the other end ground connection of the first resistor, the photoelectricity coupling
The 4th pin ground connection of clutch, one end of the 3rd resistor are connected with first output terminal, first output terminal and institute
Microcontroller connection is stated, the other end of the 3rd resistor is connected with one end of second capacitance, and the one of the second resistance
End is connected with first power supply, the other end of the other end of the second resistance and the second capacitance with the photoelectricity coupling
The 5th pin connection of clutch, the resistance value of the first resistor is 5.6k Ω, and the resistance value of the 3rd resistor is 6.6k Ω, described
The capacitance of second capacitance is 120pF.
In classroom blackboard LED light strip drive circuit of the present invention, the power supply circuit includes the 3rd capacitance, the 4th
Capacitance, the 4th resistance, the 5th resistance, bidirectional trigger diode, the second diode, the 3rd zener diode, the 4th diode,
One triode, the second power supply and second voltage output terminal, one end and the bridge rectifier of the 3rd capacitance
Positive output end connects, the other end of the 3rd capacitance by the 4th resistance respectively with the bidirectional trigger diode one
End is connected with the anode of the 4th diode, the other end ground connection of the bidirectional trigger diode, the cathode of the 4th diode
The cathode with second diode, one end of the 5th resistance and the second power supply are connected respectively, the 5th resistance it is another
One end is connected with the base stage of first triode, and the emitter of first triode and one end of the 6th resistance connect
Connect, the anode of second diode and the other end of the 6th resistance are grounded, the cathode of the 3rd zener diode, the 4th
One end of capacitance and second voltage output terminal are connected with second power supply, the collector of first triode,
The other end of the anode of three zener diodes and the 4th capacitance is grounded.
In classroom blackboard LED light strip drive circuit of the present invention, the model S-103 of the 4th diode,
The resistance value of 6th resistance is 2.7k Ω.
In classroom blackboard LED light strip drive circuit of the present invention, the power supply circuit further includes the 7th resistance, institute
The one end for stating the 7th resistance is connected with the cathode of the 4th diode, the other end of the 7th resistance and the described second power supply
Power supply connects, and the resistance value of the 7th resistance is 3.6k Ω.
In classroom blackboard LED light strip drive circuit of the present invention, first triode is NPN type triode.
In classroom blackboard LED light strip drive circuit of the present invention, the power conditioning circuitry includes pulsewidth modulation
Chip, the 5th diode, the 6th diode, transformer, the first metal-oxide-semiconductor, the 8th resistance, the 9th resistance, the tenth resistance, the 11st
Resistance, the 12nd resistance, the 13rd resistance, the 5th capacitance and the 6th capacitance, one end of the primary coil of the transformer and institute
State the output terminal connection of microcontroller, the other end ground connection of the primary coil of the transformer, the secondary coil of the transformer
One end be connected respectively with one end of the 5th capacitance and the positive input terminal of blackboard LED light strip, the 5th capacitance it is another
End is connected with the cathode of the 5th diode, the anode of the 5th diode respectively one end with the 13rd resistance,
One end of the other end of the secondary coil of transformer and the 6th capacitance connects, and the other end of the 6th capacitance passes through the described tenth
One resistance eutral grounding, the other end of the 13rd resistance are connected with the drain electrode of first metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor
Pole is connected with the cathode of the 6th diode and the 6th pin of pulse width modulating chip respectively by the 12nd resistance, institute
State the plus earth of the 6th diode, the source electrode of first metal-oxide-semiconductor one end with the tenth resistance and the 9th resistance respectively
One end connection, the other end ground connection of the tenth resistance, the other end of the 9th resistance respectively with the 8th resistance
One end is connected with the 3rd pin of pulse width modulating chip, the other end ground connection of the 8th resistance.
In classroom blackboard LED light strip drive circuit of the present invention, the resistance value of the 12nd resistance is 6.6k Ω,
The resistance value of 13rd resistance is 3.6k Ω.
In classroom blackboard LED light strip drive circuit of the present invention, first metal-oxide-semiconductor is N-channel MOS pipe.
Implement the classroom blackboard LED light strip drive circuit of the present invention, have the advantages that：Due to equipped with bridge rectifier
Circuit, voltage detecting circuit, power supply circuit, microcontroller and power conditioning circuitry；Voltage detecting circuit includes first resistor, the
Two resistance, 3rd resistor, photoelectrical coupler, the first electrolytic capacitor, the second capacitance, the first power supply and the first output terminal, should
For voltage detecting circuit relative to traditional voltage sampling circuit, the component that it is used is less, can so reduce hardware cost,
In addition, first resistor is used to carry out current-limiting protection, the second capacitance forms filter circuit with 3rd resistor, for filtering clutter, this
Outer 3rd resistor is additionally operable to carry out current-limiting protection, therefore circuit structure is relatively simple, cost is relatively low, the security of circuit and reliable
Property is higher.
Brief description of the drawings
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, drawings in the following description are 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 the structure diagram in classroom blackboard LED light strip drive circuit one embodiment of the present invention；
Fig. 2 is the circuit diagram of voltage detecting circuit in the embodiment；
Fig. 3 is the circuit diagram of power supply circuit in the embodiment；
Fig. 4 is the circuit diagram of power conditioning circuitry in the embodiment.
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 classroom blackboard LED light strip drive circuit embodiment of the present invention, the knot of the classroom blackboard LED light strip drive circuit
Structure schematic diagram is as shown in Figure 1.In Fig. 1, which includes bridge rectifier 1, voltage detecting electricity
Road 2, power supply circuit 3, microcontroller 4 and power conditioning circuitry 5, wherein, the input terminal connection 220V of bridge rectifier 1
One end L of alternating current, the other end N of another input terminal connection 220V alternating currents of bridge rectifier 1, bridge rectifier
The positive input of 1 the positive output end input terminal with voltage detecting circuit 2, the input terminal of power supply circuit 3 and blackboard LED light strip respectively
LED+ connections are held, the output terminal of voltage detecting circuit 2 and the output terminal of power supply circuit 3 are connected with microcontroller 4, microcontroller
4 output terminal is connected with the signal control terminal of power conditioning circuitry 5, negative output terminal and the power adjusting electricity of bridge rectifier 1
The input terminal connection on road 5, the output terminal of power conditioning circuitry 5 are connected with the negative input end LED- of blackboard LED light strip.
In the present embodiment, 220V AC conversions are direct current by bridge rectifier 1, and power supply circuit 3 does decompression processing
Low tension is supplied into microcontroller 4 afterwards, voltage detecting circuit 2 samples the output voltage of bridge rectifier 1, and feeds back
To microcontroller 4, microcontroller 4 controls the output of power conditioning circuitry 5 according to feedback voltage, ensures classroom blackboard LED light strip
Stabilized input voltage within 220V.
Fig. 2 is the circuit diagram of voltage detecting circuit in the present embodiment, and in Fig. 2, which includes first
Resistance R1, second resistance R2,3rd resistor R3, photoelectrical coupler U2, the first electrolytic capacitor C1, the power supplies of the second capacitance C2 and first
Power supply VCC, wherein, the cathode of the first electrolytic capacitor C1 positive output end and photoelectrical coupler U2 with bridge rectifier 1 respectively
The first pin (the first pin of input terminal) connection, the first electrolytic capacitor C1 anode ground connection, one end of first resistor R1 with
Second pin (second pin of the input terminal) connection of photoelectrical coupler U2, the other end ground connection of first resistor R1, photoelectric coupling
The 4th pin (the emitter pin of the output terminal) ground connection of device U2, one end of 3rd resistor R3 are connected with the first output end vo 1, the
One output end vo 1 is connected with microcontroller 4, and the other end of 3rd resistor R3 is connected with one end of the second capacitance C2, second resistance
One end of R2 is connected with the first power supply VCC, and the other end of the other end of second resistance R2 and the second capacitance C2 are and photoelectricity
The 5th pin (the collector pin of the output terminal) connection of coupler U2.
For the voltage detecting circuit 2 relative to traditional voltage sampling circuit, the component that it is used is less, circuit structure compared with
To be simple, hardware cost can be so reduced.First resistor R1 is used for the branch where the second pin of photoelectrical coupler U2
Current-limiting protection is carried out, the second capacitance C2 and 3rd resistor R3 form filter circuit, and for filtering clutter, 3rd resistor R3 is also in addition
For carrying out current-limiting protection, therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment, the first electricity
The resistance value of resistance R1 be 5.6k Ω, and the resistance value of 3rd resistor R3 is 120pF for the capacitance of 6.6k Ω, the second capacitance C2, certainly,
In practical application, the resistance value of first resistor R1 and the resistance value of 3rd resistor R3 can adjust accordingly as the case may be, the
The capacitance of two capacitance C2 can adjust accordingly as the case may be.
Fig. 3 is the circuit diagram of power supply circuit in the present embodiment, in Fig. 3, the power supply circuit 3 include the 3rd capacitance C3,
4th capacitance C4, the 4th resistance R4, the 5th resistance R5, bidirectional trigger diode TVS1, the second diode D2, two pole of the 3rd voltage stabilizing
Pipe D3, the 4th diode D4, the first triode Q1, the second power supply VDD and second voltage output end vo 2, wherein, the 3rd electricity
The one end for holding C3 is connected with the positive output end of bridge rectifier 1, and the other end of the 3rd capacitance C3 is distinguished by the 4th resistance R4
It is connected with one end of bidirectional trigger diode TVS1 and the anode of the 4th diode D4, the other end of bidirectional trigger diode TVS1
Ground connection, the cathode with the second diode D2, one end of the 5th resistance R5 and the second power supply are electric respectively for the cathode of the 4th diode D4
Source VDD connections, the other end of the 5th resistance R5 are connected with the base stage of the first triode Q1, the emitter of the first triode Q1 and
One end connection of six resistance R6, the anode of the second diode D2 and the other end of the 6th resistance R6 are grounded, two pole of the 3rd voltage stabilizing
The cathode of pipe D3, one end of the 4th capacitance C4 and second voltage output end vo 2 are connected with the second power supply VDD, and the one or three
The other end of the collector of pole pipe Q1, the anode of the 3rd zener diode D3 and the 4th capacitance C4 is grounded.
The power supply circuit 3 is relative to traditional power circuit, and the component that it is used is less, and circuit structure is relatively simple,
It so can further reduce hardware cost.4th diode D4 is Current Limiting Diodes, for supplying the 4th resistance R4 and second
Branch between electric power vd D carries out current-limiting protection.6th resistance R6 is current-limiting resistance, for the transmitting to the first triode Q1
Electrode current carries out current-limiting protection, to further enhance the safety and reliability of circuit.It is noted that in the present embodiment,
The resistance value of the model S-103 of 4th diode D4, the 6th resistance R6 are 2.7k Ω, certainly, in practical applications, the four or two pole
Pipe D4 can select diode of other models with similar functions, and the resistance value of the 6th resistance R6 can carry out as the case may be
Corresponding adjustment.
The output voltage of bridge rectifier 1 is depressured by the 3rd capacitance C3 and the 4th resistance R4, and passes through first
Stable small voltage direct current is exported after triode Q1 and the 3rd zener diode D3.Since the power supply circuit 3 is only with one
A little basic devices, therefore the magnetism produced in its work process is smaller, so as to avoid producing interference to the circuit on periphery.Together
When can also put together with other circuits, can so reduce the volume of circuit again.In addition, the power supply circuit 3 is used only cheaply
Basic device so that its production cost is relatively low.
In the present embodiment, which further includes the 7th resistance R7, one end and the 4th diode D4 of the 7th resistance R7
Cathode connection, the other end of the 7th resistance R7 is connected with the second power supply VDD.7th resistance R7 is current-limiting resistance, is used for
Current-limiting protection is carried out to the branch between the 4th diode D4 and the second power supply VDD, further to strengthen the peace of circuit
Full property and reliability.It is noted that in the present embodiment, the resistance value of the 7th resistance R7 is 3.6k Ω, certainly, in practical application
In, the resistance value of the 7th resistance R7 can adjust accordingly as the case may be.
It is noted that in the present embodiment, the first triode Q1 is NPN type triode, certainly, in practical applications,
First triode Q1 can also be PNP type triode, but at this moment the structure of circuit also will accordingly change.
Fig. 4 is the circuit diagram of power conditioning circuitry in the present embodiment, and in Fig. 4, which includes pulsewidth
Modulate chip U1, the 5th diode D5, the 6th diode D6, transformer T, the first metal-oxide-semiconductor M1, the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 5th capacitance C5 and the 6th capacitance
C6, wherein, one end of the primary coil of transformer T is connected with the output terminal of microcontroller 4, the primary coil of transformer T it is another
One end is grounded, one end of the secondary coil of transformer T respectively with one end of the 5th capacitance C5 and the positive input terminal of blackboard LED light strip
LED+ connections, the other end of the 5th capacitance C5 are connected with the cathode of the 5th diode D5, the anode of the 5th diode D5 respectively with
One end connection of one end of the 13rd resistance R13, the other end of the secondary coil of transformer T and the 6th capacitance C6, the 6th capacitance
The other end of C6 is grounded by the 11st resistance R11, and the other end of the 13rd resistance R13 is connected with the drain electrode of the first metal-oxide-semiconductor M1,
The grid of first metal-oxide-semiconductor M1 by the 12nd resistance R12 respectively with the cathode of the 6th diode D6 and pulse width modulating chip U1
6th pin connects, the plus earth of the 6th diode D6, the source electrode of the first metal-oxide-semiconductor M1 one end with the tenth resistance R10 respectively
Connected with one end of the 9th resistance R9, the other end ground connection of the tenth resistance R10, the other end of the 9th resistance R9 is electric with the 8th respectively
One end of resistance R8 is connected with the 3rd pin of pulse width modulating chip U1, the other end ground connection of the 8th resistance R8.
For the power conditioning circuitry 5 relative to traditional power conditioning circuitry, the component that it is used is less, circuit structure compared with
To be simple, hardware cost so can be further reduced.12nd resistance R12 and the 13rd resistance R13 is current-limiting resistance,
12nd resistance R12 is used to carry out the grid current of the first metal-oxide-semiconductor M1 current-limiting protection, and the 13rd resistance R13 is used for first
The drain current of metal-oxide-semiconductor M1 carries out current-limiting protection, to further enhance current limitation effect.It is noted that in the present embodiment, the
The resistance value of 12 resistance R12 is that the resistance value of 6.6k Ω, the 13rd resistance R13 are 3.6k Ω, the model of pulse width modulating chip U1
UC3842,.Certainly, in practical applications, the resistance value of the 12nd resistance R12 and the resistance value of the 13rd resistance R13 can bases
Concrete condition adjusts accordingly, and pulse width modulating chip U1 can select chip of other models with similar functions.
In the present embodiment, the 8th resistance R8, the 9th resistance R9, the 5th capacitance C5, the 11st resistance R11, the 6th capacitance C6
Buffer is formed with the 5th diode D5, the buffer and the first metal-oxide-semiconductor M1 simultaneously connect, and subtract the voltage stress of the first metal-oxide-semiconductor M1
Few, EMI is reduced, and second breakdown does not occur, when the first metal-oxide-semiconductor M1 is turned off, the secondary coil of transformer T is also easy to produce peak voltage
And peak current, these element groups are unified, and can absorb peak voltage and electric current well, the electricity flowed through from the tenth resistance R10
Stream peak value signal participates in the Duty ratio control of work at present cycle, when the voltage on the 8th resistance R8 reaches the first setting magnitude of voltage
When the big I of magnitude of voltage (setting carry out respective change as the case may be), pulse width modulating chip U1 is stopped, the first MOS
Pipe M1 is immediately turned off, and the 12nd resistance R12 forms RC network together with junction capacity Cgs, Cgd in the first metal-oxide-semiconductor M1, capacitance
Discharge and recharge directly affects the switching speed of the first metal-oxide-semiconductor M1, when the resistance value of the 12nd resistance R12 is too small, easily causes vibration, electricity
Magnetic disturbance also can be very big；When the resistance value of 12nd resistance R12 is excessive, the switching speed of the first metal-oxide-semiconductor M1, the six or two pole can be reduced
The gate source voltage of first metal-oxide-semiconductor M1 is usually limited in certain value by pipe D6, so as to protect the first metal-oxide-semiconductor M1, the first metal-oxide-semiconductor M1
Grid controlled voltage be saw-shaped ripple, when its duty cycle is bigger, the ON time of the first metal-oxide-semiconductor M1 is longer, and transformer T is stored up
The energy deposited is also more；When the first metal-oxide-semiconductor M1 ends, transformer T passes through the 5th diode D5, the 8th resistance R8, the 9th
Resistance R9 and the 5th capacitance C5 release energy, while have also achieveed the purpose that magnetic field resets, the storage next time for being transformer T,
Energy is transmitted to get ready；Pulse width modulating chip U1 adjusts the saw-shaped of its 6th pin according to output voltage and electric current moment
The size of ripple duty cycle, so as to stablize output current and voltage, thus stablizes the power of output, makes classroom blackboard LED light strip steady
Fixed, the 6th capacitance C6 and the 11st resistance R11 form peak voltage absorption circuit.
It is noted that in the present embodiment, the first metal-oxide-semiconductor M1 is N-channel MOS pipe, certainly, in practical applications, the
One metal-oxide-semiconductor M1 can also be P-channel metal-oxide-semiconductor, but at this moment the structure of circuit also will accordingly change.
In short, in the present embodiment, relative to traditional LED drive circuit, it makes the classroom blackboard LED light strip drive circuit
Component is less, and circuit structure is relatively simple, can so reduce hardware cost.In addition, the classroom blackboard LED light strip is driven
Current-limiting resistance and Current Limiting Diodes are equipped with dynamic circuit, 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 modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.
Claims (8)
1. a kind of classroom blackboard LED light strip drive circuit, it is characterised in that including bridge rectifier, voltage detecting circuit, confession
Circuit, microcontroller and power conditioning circuitry, the one of the input terminal connection 220V alternating currents of the bridge rectifier
End, another input terminal of the bridge rectifier connect the other end of the 220V alternating currents, the bridge rectifier
The positive output end input terminal with the voltage detecting circuit, the input terminal of power supply circuit and blackboard LED light strip respectively it is just defeated
Enter end connection, the output terminal of the voltage detecting circuit and the output terminal of power supply circuit are connected with the microcontroller, described
The output terminal of microcontroller is connected with the signal control terminal of the power conditioning circuitry, the negative output terminal of the bridge rectifier
It is connected with the input terminal of the power conditioning circuitry, the output terminal of the power conditioning circuitry is negative with the blackboard LED light strip
Input terminal connects；
The voltage detecting circuit includes first resistor, second resistance, 3rd resistor, photoelectrical coupler, the first electrolytic capacitor, the
Two capacitances, the first power supply and the first output terminal, the cathode of first electrolytic capacitor respectively with the bridge rectifier
Positive output end connected with the first pin of photoelectrical coupler, the anode of first electrolytic capacitor ground connection, the first resistor
One end be connected with the second pin of the photoelectrical coupler, the other end of first resistor ground connection, the photoelectrical coupler
The 4th pin ground connection, one end of the 3rd resistor is connected with first output terminal, first output terminal with it is described micro-
Controller connects, and the other end of the 3rd resistor is connected with one end of second capacitance, one end of the second resistance and
The other end of first power supply connection, the other end of the second resistance and the second capacitance with the photoelectrical coupler
The connection of the 5th pin, the resistance value of the first resistor be 5.6k Ω, and the resistance value of the 3rd resistor is 6.6k Ω, described second
The capacitance of capacitance is 120pF.
2. classroom blackboard LED light strip drive circuit according to claim 1, it is characterised in that the power supply circuit includes
3rd capacitance, the 4th capacitance, the 4th resistance, the 5th resistance, bidirectional trigger diode, the second diode, the 3rd zener diode,
4th diode, the first triode, the second power supply and second voltage output terminal, one end and the bridge of the 3rd capacitance
The positive output end connection of formula rectification circuit, the other end of the 3rd capacitance two-way are touched with described respectively by the 4th resistance
One end of hair diode is connected with the anode of the 4th diode, the other end ground connection of the bidirectional trigger diode, and the described 4th
The cathode with second diode, one end of the 5th resistance and the second power supply are connected the cathode of diode respectively, described
The other end of 5th resistance is connected with the base stage of first triode, the emitter of first triode and the described 6th electricity
One end connection of resistance, the anode of second diode and the other end of the 6th resistance are grounded, the 3rd zener diode
Cathode, the 4th capacitance one end and second voltage output terminal be connected with second power supply, first triode
Collector, the anode of the 3rd zener diode and the other end of the 4th capacitance be grounded.
3. classroom blackboard LED light strip drive circuit according to claim 2, it is characterised in that the 4th diode
Model S-103, the resistance value of the 6th resistance is 2.7k Ω.
4. classroom blackboard LED light strip drive circuit according to claim 3, it is characterised in that the power supply circuit also wraps
The 7th resistance is included, one end of the 7th resistance is connected with the cathode of the 4th diode, the other end of the 7th resistance
It is connected with second power supply, the resistance value of the 7th resistance is 3.6k Ω.
5. classroom blackboard LED light strip drive circuit according to claim 4, it is characterised in that first triode is
NPN type triode.
6. the classroom blackboard LED light strip drive circuit according to claim 1 to 5 any one, it is characterised in that the work(
Rate, which adjusts circuit, includes pulse width modulating chip, the 5th diode, the 6th diode, transformer, the first metal-oxide-semiconductor, the 8th resistance, the
Nine resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 5th capacitance and the 6th capacitance, the transformation
One end of the primary coil of device is connected with the output terminal of the microcontroller, another termination of the primary coil of the transformer
Ground, one end of the secondary coil of the transformer respectively with one end of the 5th capacitance and the positive input terminal of blackboard LED light strip
Connection, the other end of the 5th capacitance are connected with the cathode of the 5th diode, the anode difference of the 5th diode
The other end of secondary coil of one end, transformer with the 13rd resistance and one end of the 6th capacitance are connected, and the described 6th
The other end of capacitance passes through the 11st resistance eutral grounding, the other end of the 13rd resistance and the leakage of first metal-oxide-semiconductor
Pole connects, and the grid of first metal-oxide-semiconductor passes through the 12nd resistance cathode and pulsewidth with the 6th diode respectively
Modulate the 6th pin connection of chip, the plus earth of the 6th diode, the source electrode of first metal-oxide-semiconductor respectively with it is described
One end of tenth resistance is connected with one end of the 9th resistance, the other end of the tenth resistance ground connection, the 9th resistance it is another
One end is connected with one end of the 8th resistance and the 3rd pin of pulse width modulating chip respectively, the other end of the 8th resistance
Ground connection.
7. classroom blackboard LED light strip drive circuit according to claim 6, it is characterised in that the 12nd resistance
Resistance value is 6.6k Ω, and the resistance value of the 13rd resistance is 3.6k Ω.
8. classroom blackboard LED light strip drive circuit according to claim 7, it is characterised in that first metal-oxide-semiconductor is N
Channel MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465042.2A CN107949119A (en) | 2017-12-28 | 2017-12-28 | Classroom blackboard LED light strip drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465042.2A CN107949119A (en) | 2017-12-28 | 2017-12-28 | Classroom blackboard LED light strip drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107949119A true CN107949119A (en) | 2018-04-20 |
Family
ID=61940745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711465042.2A Pending CN107949119A (en) | 2017-12-28 | 2017-12-28 | Classroom blackboard LED light strip drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107949119A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108944654A (en) * | 2018-08-01 | 2018-12-07 | 杨志超 | A kind of automobile tail light brake degree display control program |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012045475A1 (en) * | 2010-10-08 | 2012-04-12 | Tridonic Ag | Operating circuit for light-emitting diodes |
| CN206100533U (en) * | 2016-07-25 | 2017-04-12 | 广东欧曼科技股份有限公司 | Electrified way of high pressure constant current lamp |
| CN106910474A (en) * | 2017-03-21 | 2017-06-30 | 深圳市华星光电技术有限公司 | A kind of short-circuit protection circuit and backlight drive circuit |
| CN206341447U (en) * | 2016-11-10 | 2017-07-18 | 上海蓝伯科电子科技有限公司 | Self-checking circuit for LED load drive system |
-
2017
- 2017-12-28 CN CN201711465042.2A patent/CN107949119A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012045475A1 (en) * | 2010-10-08 | 2012-04-12 | Tridonic Ag | Operating circuit for light-emitting diodes |
| CN206100533U (en) * | 2016-07-25 | 2017-04-12 | 广东欧曼科技股份有限公司 | Electrified way of high pressure constant current lamp |
| CN206341447U (en) * | 2016-11-10 | 2017-07-18 | 上海蓝伯科电子科技有限公司 | Self-checking circuit for LED load drive system |
| CN106910474A (en) * | 2017-03-21 | 2017-06-30 | 深圳市华星光电技术有限公司 | A kind of short-circuit protection circuit and backlight drive circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108944654A (en) * | 2018-08-01 | 2018-12-07 | 杨志超 | A kind of automobile tail light brake degree display control program |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103648202A (en) | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit | |
| CN201813599U (en) | LED (Light-Emitting Diode) dimmer power | |
| CN205596389U (en) | Constant current AC drive circuit and TV set | |
| CN108650748A (en) | A kind of constant pressure dimming power source device being compatible with a variety of dimming modes | |
| CN106026623B (en) | A kind of isolated electronic switch | |
| CN103491689B (en) | Controllable silicon light modulation LED driving switch power circuit | |
| CN108055731A (en) | Classroom blackboard LED light strip driving circuit with protective effect | |
| CN103220856A (en) | Self-adapting light emitting diode (LED) driving power circuit | |
| CN203136261U (en) | LED light modulation circuit | |
| CN203492241U (en) | Novel LED dimming module | |
| CN107949119A (en) | Classroom blackboard LED light strip drive circuit | |
| CN104010405A (en) | LED light modulation circuit | |
| CN204482133U (en) | A kind of LED constant pressure and flow drive circuit | |
| CN104053282A (en) | Color-mixed LED illumination system and drive circuit thereof | |
| CN207099377U (en) | LED drive system and constant-current control circuit | |
| CN103889123A (en) | LED dimming circuit and LED lamp | |
| CN203618188U (en) | Driving power supply of LED energy-saving lamp | |
| CN203301826U (en) | LED driving circuit composed of discrete components | |
| CN107969053A (en) | Classroom blackboard LED light strip drive circuit with current-limiting protection | |
| CN107592704B (en) | A kind of constant-current circuit for LCD TV | |
| CN106910475A (en) | New type liquid crystal television carries on the back lamp drive circuit | |
| CN207802450U (en) | The light source driving circuit and light source module of tunable optical | |
| CN205356734U (en) | Light -emitting diode (LED) lighting equipment | |
| CN107835547A (en) | LED power-supplying circuit | |
| CN204859676U (en) | LED drive arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |