CN108063437A - The short-circuit protection circuit of classroom blackboard LED light strip - Google Patents
The short-circuit protection circuit of classroom blackboard LED light strip Download PDFInfo
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- CN108063437A CN108063437A CN201711465034.8A CN201711465034A CN108063437A CN 108063437 A CN108063437 A CN 108063437A CN 201711465034 A CN201711465034 A CN 201711465034A CN 108063437 A CN108063437 A CN 108063437A
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- 239000004065 semiconductor Substances 0.000 claims abstract description 69
- 238000004146 energy storage Methods 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 39
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
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Abstract
The invention discloses a kind of short-circuit protection circuits of classroom blackboard LED light strip; 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；Anti- reverse power connection circuit includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, first resistor, second resistance, the first capacitance and light emitting diode.Implement the short-circuit 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, more particularly to a kind of short-circuit protection circuit 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.Traditional classroom blackboard
The circuit structure of LED light strip is complex, and hardware cost is higher.In addition, the circuit of traditional classroom blackboard LED light strip is due to lacking
Few corresponding circuit protection function, the safety and reliability for causing circuit be 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
For the short-circuit protection circuit 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 short circuit of classroom blackboard LED light strip
Protect circuit, including power supply, anti-reverse power connection circuit, energy storage filter circuit, constant-current control circuit, output ballasting circuit 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 anti-electric
Source reversal connection circuit connection, for filter out the electromagnetic interference in the power supply of the anti-reverse power connection circuit output and it is described power supply electricity
Source provides instantaneous power when powering off, and the constant-current control circuit is connected with the energy storage filter circuit, for the energy storage to be filtered
The power supply of wave circuit output provides constant electric current, the output ballast for classroom blackboard LED light strip after being coordinated and being controlled
Circuit is connected with the constant-current control circuit, the constant-current supply for the constant-current control circuit to be exported carries out ballast processing,
There is provided stable voltage for the classroom blackboard LED light strip, the sampling protection circuit respectively with the classroom blackboard LED light strip
It is connected with constant-current control circuit, for gathering the electric current of classroom blackboard LED light strip output and send it to the constant current
Control circuit；
The anti-reverse power connection circuit includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, first resistor, second resistance, the first capacitance
And light emitting diode, the source electrode of first metal-oxide-semiconductor respectively with one end of the first resistor, power supply anode, shine
The anode of diode is connected with one end of energy storage filter circuit, the grid of first metal-oxide-semiconductor respectively with the first resistor
The drain electrode connection of the other end, the cathode of power supply and the second metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and first capacitance
One end connection, the one end of the other end of first capacitance respectively with the grid of second metal-oxide-semiconductor and second resistance is connected,
The other end of the second resistance respectively with the source electrode of second metal-oxide-semiconductor, the cathode of light emitting diode and energy storage filter circuit
Other end connection, the capacitance of first capacitance is 500pF.
In the short-circuit protection circuit of classroom blackboard LED light strip of the present invention, the anti-reverse power connection circuit also wraps
Include the second capacitance, one end of second capacitance is connected with the grid of first metal-oxide-semiconductor, the other end of second capacitance with
The drain electrode connection of second metal-oxide-semiconductor, the capacitance of second capacitance is 470pF.
In the short-circuit protection circuit of classroom blackboard LED light strip of the present invention, the anti-reverse power connection circuit also wraps
The first diode is included, the anode of first diode is connected with one end of the first resistor, the moon of first diode
Pole is connected with the anode of the light emitting diode, the model e-501 of first diode.
In the short-circuit protection circuit of classroom blackboard LED light strip of the present invention, first metal-oxide-semiconductor is P-channel MOS
Pipe, second metal-oxide-semiconductor are N-channel MOS pipe.
In the short-circuit protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit includes molten
Disconnected device, bridge rectifier, the 9th resistance, the tenth resistance, the 11st resistance, the 6th diode, the 7th diode, the four or three pole
Pipe, the 5th triode, the 8th capacitance, the 9th electrolytic capacitor, the tenth electrolytic capacitor, the 11st capacitance, the 12nd capacitance and brilliant lock
Pipe, one end of the fuse are connected with one end of the classroom blackboard LED light strip, the other end of the fuse and the bridge
The input terminal connection of formula rectification circuit, another input terminal of the bridge rectifier and the classroom blackboard LED light
The other end connection of band, the positive output end of the bridge rectifier respectively with the anode of the 8th electrolytic capacitor, the 9th electricity
One end of resistance, the anode of the 9th electrolytic capacitor and the 5th triode emitter connection, the cathode of the 8th electrolytic capacitor with
The negative output terminal connection of the bridge rectifier, the other end of the 9th resistance base stage with the 4th triode respectively
It being connected with the cathode of the 6th diode, the anode of the 6th diode is connected with the cathode of the 8th electrolytic capacitor, and the 9th
The cathode of 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 short-circuit protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit further includes
12nd resistance, one end of the 12nd resistance are connected with the cathode of the thyristor, the other end of the 12nd resistance
It is connected with the other end of the tenth resistance, the resistance value of the 12nd resistance is 30k Ω.
In the short-circuit protection circuit of classroom blackboard LED light strip of the present invention, the sampling protection circuit further includes
13rd resistance, one end of the 13rd resistance are connected with the collector of the 5th triode, the 13rd resistance
The other end is connected with the anode of the tenth electrolytic capacitor, and the resistance value of the 13rd resistance is 47k Ω.
Implement the short-circuit protection circuit of the classroom blackboard LED light strip of the present invention, have the advantages that：Due to being equipped with confession
Power supply, anti-reverse power connection circuit, energy storage filter circuit, constant-current control circuit, output ballasting circuit and sampling protection circuit, prevent
Reverse power connection circuit includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, first resistor, second resistance, the first capacitance and light emitting diode, should
For anti-reverse power connection circuit compared with traditional anti-reverse power connection circuit, the component used is less, can so reduce hardware
Cost, in addition, the first capacitance is coupled capacitor, for preventing the interference between the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, therefore road is tied
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 the structure diagram in short-circuit protection circuit one embodiment of classroom blackboard LED light strip of the present invention；
Fig. 2 is the circuit diagram of anti-reverse power connection 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 short-circuit protection circuit embodiment of classroom blackboard LED light strip of the present invention, the short circuit of the classroom blackboard LED light strip
The structure diagram for protecting circuit is as shown in Figure 1.In Fig. 1, the short-circuit protection circuit of the classroom blackboard LED light strip includes power supply electricity
Source 1, anti-reverse power connection circuit 2, energy storage filter circuit 3, constant-current control circuit 4, output ballasting circuit 5 and sampling protection circuit 6,
Wherein, anti-reverse power connection circuit 2 is connected with power supply 1, and energy storage filter circuit 3 is connected with anti-reverse power connection circuit 2, for filtering
Instantaneous power, constant current control are provided except the electromagnetic interference in the power supply of anti-reverse power connection circuit 2 output and when power supply 1 powers off
It is religion after circuit 4 processed is connected with energy storage filter circuit 3, the power supply for energy storage filter circuit 3 to be exported is coordinated and controlled
Room blackboard LED light strip provides constant electric current, and output ballasting circuit 5 is connected with constant-current control circuit 4, for current constant control is electric
The constant-current supply that road 4 exports carries out ballast processing, and stable voltage is provided for classroom blackboard LED light strip, and sampling protection circuit 6 divides
Be not connected with classroom blackboard LED light strip and constant-current control circuit 4, for gather classroom blackboard LED light strip output electric current and will
It is transmitted to constant-current control circuit 4.Sampling protection circuit 6, which can be played, to be protected when short circuit occurs in constant-current control circuit 4 in circuit
Electronic component effect.
Fig. 2 is the circuit diagram of anti-reverse power connection circuit in the present embodiment, and in Fig. 2, which includes
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, first resistor R1, second resistance R2, the first capacitance C1 and Light-emitting diode LED 1,
In, the source electrode of the first metal-oxide-semiconductor M1 respectively with one end of first resistor R1, the anode of power supply 1, Light-emitting diode LED 1 sun
Pole is connected with one end of energy storage filter circuit 3, and the grid of the first metal-oxide-semiconductor M1 is electric with the other end of first resistor R1, power supply respectively
The drain electrode connection of the cathode in source 1 and the second metal-oxide-semiconductor M2, the drain electrode of the first metal-oxide-semiconductor M2 are connected with one end of the first capacitance C1, and first
The one end of the other end of capacitance C1 respectively with the grid of the second metal-oxide-semiconductor M2 and second resistance R2 is connected, and second resistance R2's is another
The other end respectively with the source electrode of the second metal-oxide-semiconductor M2, the cathode of Light-emitting diode LED 1 and energy storage filter circuit 3 is held to be connected.
The anti-reverse power connection circuit 2 is compared with traditional anti-reverse power connection circuit, and the component used is less, circuit knot
Structure is relatively simple, can so reduce hardware cost.In addition, the first capacitance C1 is coupled capacitor, for preventing the first metal-oxide-semiconductor M1
With the interference between the second metal-oxide-semiconductor M2, therefore the safety and reliability of circuit is higher.It is noted that in the present embodiment,
The capacitance of first capacitance C1 is 500pF, and certainly, in practical applications, the capacitance of the first capacitance C1 can be according to specific feelings
Condition adjusts accordingly.
When power supply 1 normally accesses, the gate-source voltage of the first metal-oxide-semiconductor M1 is negative, the second metal-oxide-semiconductor M2 conductings, together
Reason, the gate-source voltage of the second metal-oxide-semiconductor M2 are then connected to the hair of the source electrode of the second metal-oxide-semiconductor M2 for just, the second metal-oxide-semiconductor M2 is turned on
Optical diode LED1 has electric current by the way that then 1 bright light of Light-emitting diode LED prompting power supply 1 normally accesses.
When 1 reversal connection of power supply, the gate-source voltage of the first metal-oxide-semiconductor M1 is just, the first metal-oxide-semiconductor M1 ends, similarly, the
The gate-source voltage of two metal-oxide-semiconductor M2 is negative, the second metal-oxide-semiconductor M2 cut-offs, then is connected to the light-emitting diodes of the source electrode of the second metal-oxide-semiconductor M2
Pipe LED1 no currents are by the way that then Light-emitting diode LED 1 does not shine, and in the state of turning off the light, prompts 1 reversal connection of power supply.
The anti-reverse power connection circuit 2 is by setting the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 to work as 1 reversal connection of power supply
When, it is supplied to the bias voltage of the grid source electrode of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 and the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2
The polarity of required bias voltage then connects on the contrary, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is caused to be in cut-off state during conducting
3 no current of energy storage filter circuit of the source electrode of the second metal-oxide-semiconductor M2 is connected to by the way that then power supply Non voltage output, reaches anti-reverse mesh
's.
In the present embodiment, which further includes the second capacitance C2, one end and first of the second capacitance C2
The grid connection of metal-oxide-semiconductor M1, the other end of the second capacitance C2 are connected with the drain electrode of the second metal-oxide-semiconductor M2.Second capacitance C2 is coupling
Capacitance, for further preventing the interference between the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2, to further enhance the safety of circuit
Property and reliability.It is noted that in the present embodiment, the capacitance of the second capacitance C2 is 470pF, certainly, in practical application
In, the capacitance of the second capacitance C2 can adjust accordingly as the case may be.
In the present embodiment, which further includes the first diode D1, the anode of the first diode D1 and
One end connection of one resistance R1, the cathode of the first diode D1 are connected with the anode of Light-emitting diode LED 1.First diode D1
For Current Limiting Diodes, for carrying out current-limiting protection to the branch between first resistor R1 and Light-emitting diode LED 1, with more into one
The safety and reliability of step enhancing circuit.It is noted that in the present embodiment, the model e-501 of the first diode D1,
Certainly, in practical applications, the first diode D1 can also select diode of other models with similar functions.
It is noted that in the present embodiment, the first metal-oxide-semiconductor M1 is P-channel metal-oxide-semiconductor, and the second metal-oxide-semiconductor M2 is N-channel MOS
Pipe.Certainly, in practical applications, the first metal-oxide-semiconductor M1 or N-channel MOS pipe, the second metal-oxide-semiconductor M2 or P-channel
Metal-oxide-semiconductor, but at this moment the structure of circuit also will accordingly change.
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 energy storage filter circuit 3, constant-current control circuit 4 and output ballasting circuit 5.
In short, in the present embodiment, which uses compared with traditional anti-reverse power connection circuit
Component is less, and circuit structure is relatively simple, can so reduce hardware cost, is in addition equipped in the anti-reverse power connection circuit 2
Coupled capacitor, 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. a kind of short-circuit protection circuit of classroom blackboard LED light strip, which is characterized in that including power supply, anti-reverse power connection electricity
Road, energy storage filter circuit, constant-current control circuit, output ballasting circuit and sampling protection circuit, the anti-reverse power connection circuit with
Power supply connection, the energy storage filter circuit is connected with the anti-reverse power connection circuit, for filtering out the anti-power supply
Electromagnetic interference in the power supply of reversal connection circuit output simultaneously provides instantaneous power, the current constant control when the power supply powers off
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 after being controlled
Classroom blackboard LED light strip provides constant electric current, and the output ballasting circuit is connected with the constant-current control circuit, for by institute
The constant-current supply for stating constant-current control circuit output carries out ballast processing, and stable voltage is provided for the classroom blackboard LED light strip,
The sampling protection circuit is connected respectively with the classroom blackboard LED light strip and constant-current control circuit, for gathering the classroom
The electric current of blackboard LED light strip output simultaneously sends it to the constant-current control circuit；
The anti-reverse power connection circuit includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, first resistor, second resistance, the first capacitance and hair
Optical diode, the source electrode of first metal-oxide-semiconductor respectively with one end of the first resistor, the anode of power supply, light-emitting diodes
The anode of pipe is connected with one end of energy storage filter circuit, and the grid of first metal-oxide-semiconductor is another with the first resistor respectively
The drain electrode connection at end, the cathode of power supply and the second metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and the one of first capacitance
End connection, the one end of the other end of first capacitance respectively with the grid of second metal-oxide-semiconductor and second resistance is connected, described
The other end of second resistance is another with the source electrode of second metal-oxide-semiconductor, the cathode of light emitting diode and energy storage filter circuit respectively
One end connects, and the capacitance of first capacitance is 500pF.
2. the short-circuit protection circuit of classroom blackboard LED light strip according to claim 1, which is characterized in that the anti-power supply
Reversal connection circuit further includes the second capacitance, and one end of second capacitance is connected with the grid of first metal-oxide-semiconductor, second electricity
The other end of appearance is connected with the drain electrode of second metal-oxide-semiconductor, and the capacitance of second capacitance is 470pF.
3. the short-circuit protection circuit of classroom blackboard LED light strip according to claim 2, which is characterized in that the anti-power supply
Reversal connection circuit further includes the first diode, and the anode of first diode is connected with one end of the first resistor, and described
The cathode of one diode is connected with the anode of the light emitting diode, the model e-501 of first diode.
4. the short-circuit protection circuit of classroom blackboard LED light strip according to claim 3, which is characterized in that the first MOS
It manages as P-channel metal-oxide-semiconductor, second metal-oxide-semiconductor is N-channel MOS pipe.
5. the short-circuit protection circuit of classroom blackboard LED light strip according to any one of claims 1 to 4, which is characterized in that
The sampling protection circuit includes fuse, bridge rectifier, the 9th resistance, the tenth resistance, the 11st resistance, the six or two pole
Pipe, 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 is connected with one end of the classroom blackboard LED light strip, described
The other end of fuse is connected with an input terminal of the bridge rectifier, another input of the bridge rectifier
End is connected with the other end of the classroom blackboard LED light strip, and the positive output end of the bridge rectifier is respectively with the described 8th
The anode of electrolytic capacitor, the emitter connection of one end of the 9th resistance, the anode of the 9th electrolytic capacitor and the 5th triode, it is described
The cathode of 8th electrolytic capacitor is connected with the negative output terminal of the bridge rectifier, the other end of the 9th resistance respectively with
The base stage of 4th triode is connected with the cathode of the 6th diode, the anode of the 6th diode and the described 8th electrolysis
The cathode connection of capacitance, the cathode of the 9th electrolytic capacitor are 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 short-circuit protection circuit of classroom blackboard LED light strip according to claim 5, which is characterized in that the sampling is protected
Protection circuit further includes the 12nd resistance, and one end of the 12nd resistance is connected with the cathode of the thyristor, and the described 12nd
The other end of resistance is connected with the other end of the tenth resistance, and the resistance value of the 12nd resistance is 30k Ω.
7. the short-circuit protection circuit of classroom blackboard LED light strip according to claim 6, which is characterized in that the sampling is protected
Protection circuit further includes the 13rd resistance, and one end of the 13rd resistance is connected with the collector of the 5th triode, described
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.
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| CN201711465034.8A CN108063437A (en) | 2017-12-28 | 2017-12-28 | The short-circuit protection circuit of classroom blackboard LED light strip |
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| CN201711465034.8A CN108063437A (en) | 2017-12-28 | 2017-12-28 | The short-circuit protection circuit of classroom blackboard LED light strip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20180522 |