CN208477800U - A kind of circuit for the teaching of LED luminance regulative mode - Google Patents
A kind of circuit for the teaching of LED luminance regulative mode Download PDFInfo
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- CN208477800U CN208477800U CN201721800706.1U CN201721800706U CN208477800U CN 208477800 U CN208477800 U CN 208477800U CN 201721800706 U CN201721800706 U CN 201721800706U CN 208477800 U CN208477800 U CN 208477800U
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Abstract
The utility model provides a kind of circuit for the teaching of LED luminance regulative mode, belongs to electronic technology field.Circuit generates impulse wave by the adjustable pulse wave generator of duty ratio, and impulse wave directly drives triode all the way, then drives first via LED by triode, to show the effect of pulse width modulation manner；Another way impulse wave is low-pass filtered, obtain the analog voltage directly proportional to impulse wave duty ratio, voltage controlled current source is driven by analog voltage again, voltage controlled current source drives the second paths of LEDs, the second paths of LEDs is set to obtain the electric current directly proportional to impulse wave duty ratio, to show the effect of current-mode analog quantity regulative mode.This circuit is applied to teaching, student passes through comparative experiments, it is readily appreciated that the working principle of pulse width modulation manner, to improve teaching effect.
Description
Technical field
The utility model is a kind of circuit for the teaching of LED luminance regulative mode, belongs to electronic technology field.
Background technique
Current LED illumination has entered public family, and LED illumination circuit especially LED luminance adjusts circuit, gradually becomes height
One of the main contents of duty universities and colleges electronics curriculum.LED luminance regulative mode mainly has the pulse width modulation manner (side PWM
Formula) and current-mode analog quantity regulative mode, due to lacking practice, many students do not understand the principle of pulse width modulation manner, to arteries and veins
The effect of wide regulative mode fosters suspicion.
Utility model content
To solve the above-mentioned problems, the utility model provides a kind of circuit for the teaching of LED luminance regulative mode, electricity
It routes the adjustable pulse wave generator of duty ratio and generates impulse wave, impulse wave directly drives triode all the way, makes triode operation
First via LED is driven in switch state, then by triode, to show the effect of pulse width modulation manner；Another way impulse wave is through low
Pass filter obtains the analog voltage directly proportional to impulse wave duty ratio, drives voltage controlled current source, voltage-controlled constant current again by analog voltage
Source drives the second paths of LEDs, so that the second paths of LEDs is obtained the electric current directly proportional to impulse wave duty ratio, to show current-mode analog quantity tune
The effect of section mode.
It is that the utility model is taken the specific technical proposal is:
1, a kind of circuit for the teaching of LED luminance regulative mode, it is characterized in that: the circuit includes 555 chip U1, amplifier
U2, triode Q1 and Q2, resistance R1~R4, three end adjustable resistance RV1 and RV2, diode D1 and D2,1 and of Light-emitting diode LED
LED2, capacitor C1 and C2, wherein 1 foot of 555 chip U1 is grounded, 4 feet and 8 feet connect+5V power supply, and 2 feet and 6 feet connect the one of capacitor C1
It holds, the anode of the cathode of diode D1 and diode D2, the other end ground connection of capacitor C1, the anode of diode D1 connects 555 chips
The mobile terminal of 7 feet of U1 and three end adjustable resistance RV1, the fixed termination+5V power supply of one of three end adjustable resistance RV1, another
The cathode of fixed terminating diode D2；The emitter of triode Q1 is grounded, the cathode of collector sending and receiving optical diode LED1, is shone
One end of the positive connecting resistance R3 of diode (LED) 1, another termination+5V power supply of resistance R3, the base stage connecting resistance R1 of triode Q1
One end, 3 feet of the 555 chip U1 of another termination of resistance R1 and one end of resistance R2；Another termination capacitor C2's of resistance R2
One fixing end of anode and three end adjustable resistance RV2, the cathode ground connection of capacitor C2, another of three end adjustable resistance RV2 are solid
Fixed end ground connection；Positive supply termination+5V the power supply of amplifier U2, negative power end ground connection, normal phase input end connect three end adjustable resistance RV2's
Mobile terminal, the base stage of output termination triode Q2；The cathode of the collector sending and receiving optical diode LED2 of triode Q2, light-emitting diodes
The anode of pipe LED2 connects+5V power supply, and triode Q2 emitter meets the inverting input terminal of amplifier U2 and one end of resistance R4, resistance R4
The other end ground connection；Amplifier U2 uses integrated transporting discharging LM358.
The utility model has the following beneficial effects: the utility model provide it is a kind of for LED luminance regulative mode teaching
This circuit is applied to teaching by circuit, and student passes through comparative experiments, it is readily appreciated that the working principle of pulse width modulation manner, thus
Improve teaching effect.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing.
As shown in Figure 1, it is a kind of for LED luminance regulative mode teaching circuit, circuit include 555 chip U1, amplifier U2,
Triode Q1 and Q2, resistance R1~R4, three end adjustable resistance RV1 and RV2, diode D1 and D2,1 and of Light-emitting diode LED
LED2, capacitor C1 and C2, wherein 1 foot of 555 chip U1 is grounded, 4 feet and 8 feet connect+5V power supply, and 2 feet and 6 feet connect the one of capacitor C1
It holds, the anode of the cathode of diode D1 and diode D2, the other end ground connection of capacitor C1, the anode of diode D1 connects 555 chips
The mobile terminal of 7 feet of U1 and three end adjustable resistance RV1, the fixed termination+5V power supply of one of three end adjustable resistance RV1, another
The cathode of fixed terminating diode D2；The emitter of triode Q1 is grounded, the cathode of collector sending and receiving optical diode LED1, is shone
One end of the positive connecting resistance R3 of diode (LED) 1, another termination+5V power supply of resistance R3, the base stage connecting resistance R1 of triode Q1
One end, 3 feet of the 555 chip U1 of another termination of resistance R1 and one end of resistance R2；Another termination capacitor C2's of resistance R2
One fixing end of anode and three end adjustable resistance RV2, the cathode ground connection of capacitor C2, another of three end adjustable resistance RV2 are solid
Fixed end ground connection；Positive supply termination+5V the power supply of amplifier U2, negative power end ground connection, normal phase input end connect three end adjustable resistance RV2's
Mobile terminal, the base stage of output termination triode Q2；The cathode of the collector sending and receiving optical diode LED2 of triode Q2, light-emitting diodes
The anode of pipe LED2 connects+5V power supply, and triode Q2 emitter meets the inverting input terminal of amplifier U2 and one end of resistance R4, resistance R4
The other end ground connection；Amplifier U2 uses integrated transporting discharging LM358.
555 chip U1, diode D1 and D2, capacitor C1 and three end adjustable resistance RV1 constitute the adjustable arteries and veins of duty ratio
Rushing wave producer, the impulse wave of output makes triode Q1 work in switch state all the way through R1 driving triode Q1, then by
Triode Q1 drives Light-emitting diode LED 1, to show the effect of pulse width modulation manner；Another way impulse wave is through resistance R2 and electricity
Hold C2 filtering, obtain the analog voltage directly proportional to impulse wave duty ratio, this analog voltage is divided through three end adjustable resistance RV2 again
Afterwards, the normal phase input end of amplifier U2 is sent to make control voltage, amplifier U2, triode Q2 and resistance R4 constitute a voltage controlled current source,
Voltage controlled current source drives Light-emitting diode LED 2 again, so that LED2 is obtained the electric current directly proportional to impulse wave duty ratio, to show electricity
The effect of flow field simulation amount regulative mode.
Before energization, the mobile terminal to middle position of three end adjustable resistance RV1 is first adjusted, after energization, adjusts three end adjustable electrics
The mobile terminal for hindering RV2 keeps the brightness of LED2 and LED1 close；Three end adjustable resistance RV1 are adjusted, the duty ratio of impulse wave is changed,
The variation of LED1 and LED2 brilliant synchrotron can be observed, observe impulse wave with oscillograph, it is wider to can be observed impulse wave duty ratio,
LED1 is brighter, with the electric current of multimeter measurement LED2, can observe that LED2 electric current is bigger, and LED2 is brighter.
Claims (1)
1. it is a kind of for LED luminance regulative mode teaching circuit, it is characterized in that: the circuit include 555 chip U1, amplifier U2,
Triode Q1 and Q2, resistance R1~R4, three end adjustable resistance RV1 and RV2, diode D1 and D2,1 and of Light-emitting diode LED
LED2, capacitor C1 and C2, wherein 1 foot of 555 chip U1 is grounded, 4 feet and 8 feet connect+5V power supply, and 2 feet and 6 feet connect the one of capacitor C1
It holds, the anode of the cathode of diode D1 and diode D2, the other end ground connection of capacitor C1, the anode of diode D1 connects 555 chips
The mobile terminal of 7 feet of U1 and three end adjustable resistance RV1, the fixed termination+5V power supply of one of three end adjustable resistance RV1, another
The cathode of fixed terminating diode D2；The emitter of triode Q1 is grounded, the cathode of collector sending and receiving optical diode LED1, is shone
One end of the positive connecting resistance R3 of diode (LED) 1, another termination+5V power supply of resistance R3, the base stage connecting resistance R1 of triode Q1
One end, 3 feet of the 555 chip U1 of another termination of resistance R1 and one end of resistance R2；Another termination capacitor C2's of resistance R2
One fixing end of anode and three end adjustable resistance RV2, the cathode ground connection of capacitor C2, another of three end adjustable resistance RV2 are solid
Fixed end ground connection；Positive supply termination+5V the power supply of amplifier U2, negative power end ground connection, normal phase input end connect three end adjustable resistance RV2's
Mobile terminal, the base stage of output termination triode Q2；The cathode of the collector sending and receiving optical diode LED2 of triode Q2, light-emitting diodes
The anode of pipe LED2 connects+5V power supply, and triode Q2 emitter meets the inverting input terminal of amplifier U2 and one end of resistance R4, resistance R4
The other end ground connection；Amplifier U2 uses integrated transporting discharging LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800706.1U CN208477800U (en) | 2017-11-10 | 2017-11-10 | A kind of circuit for the teaching of LED luminance regulative mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721800706.1U CN208477800U (en) | 2017-11-10 | 2017-11-10 | A kind of circuit for the teaching of LED luminance regulative mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208477800U true CN208477800U (en) | 2019-02-05 |
Family
ID=65204875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721800706.1U Expired - Fee Related CN208477800U (en) | 2017-11-10 | 2017-11-10 | A kind of circuit for the teaching of LED luminance regulative mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208477800U (en) |
-
2017
- 2017-11-10 CN CN201721800706.1U patent/CN208477800U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190205 Termination date: 20191110 |