CN111836425A - Hardware design circuit for realizing LED breathing animation effect - Google Patents
Hardware design circuit for realizing LED breathing animation effect Download PDFInfo
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- CN111836425A CN111836425A CN202010585339.8A CN202010585339A CN111836425A CN 111836425 A CN111836425 A CN 111836425A CN 202010585339 A CN202010585339 A CN 202010585339A CN 111836425 A CN111836425 A CN 111836425A
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- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 27
- 230000000694 effects Effects 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000033228 biological regulation Effects 0.000 claims abstract description 6
- 230000010354 integration Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000005282 brightening Methods 0.000 description 2
- 240000006829 Ficus sundaica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
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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]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides a hardware design circuit for realizing LED breathing animation effect, which comprises a square wave generation module, a triangular wave generation module, a current regulation module and an LED module, wherein the output end of the square wave generation module is connected with the input end of the triangular wave generation module; the output end of the triangular wave generation module is connected with the input end of the current adjustment module; the output end of the current adjusting module is connected with the negative end of the LED module, and the square wave generating module comprises a timer circuit capable of outputting a voltage signal with 50% duty ratio; the triangular wave generation module comprises a reference voltage circuit, an operational amplifier U21 and a resistance-capacitance integration circuit; the current adjusting module comprises a voltage divider circuit, an operational amplifier U31, a triode T31 and a current detection resistor R33; the LED module comprises an LED string consisting of at least one LED light source. The control circuit has the advantages of simple structure, easy realization, low cost and good EMC performance.
Description
Technical Field
The invention relates to the field of automobile illumination, in particular to a hardware design circuit for realizing LED breathing animation effect.
Background
As a car light called as car 'eyes', with the rapid development and innovation of car technology, the current car light not only has a basic lighting indication function, but also is added with various effects of welcome animation to express the individuality and innovation of the car light, the dynamic lighting is an additionally attractive eyeball, the concept and the lighting mode of a breathing lamp are different from the flowing dynamic lighting, the breathing lamp gradually lights and then gradually becomes dark, and the gradually lighting and the dark cycle of the period makes the car light as a dynamic effect of breathing during breathing, the car light not only moves, but also as a life-moving motion, and gives people strong vision and internal 'holding power'.
The design scheme for realizing the LED breathing animation effect (namely the periodical gradually-on and gradually-off brightness of the LED) of the current automobile lamp is that the LED is driven by a Microcontroller (MCU) and an LED driver in a combined mode to realize the LED breathing animation effect, the design is simple and convenient, but the scheme is additionally provided with the MCU and the LED driver and also needs to additionally develop a corresponding software program, so that the problem of higher cost exists, meanwhile, the MCU can generate high-frequency noise, the electromagnetic compatibility (EMC) is greatly influenced, and the problem of electromagnetic compatibility (EMC) can be brought by great risk.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a hardware design circuit for realizing the LED breathing animation effect, which not only obviously reduces the design and application cost, but also has good EMC performance.
The invention provides a hardware design circuit for realizing LED breathing animation effect, which comprises a square wave generation module, a triangular wave generation module, a current regulation module and an LED module, wherein the output end of the square wave generation module is connected with the input end of the triangular wave generation module; the output end of the triangular wave generation module is connected with the input end of the current adjustment module; the output end of the current adjusting module is connected with the negative end of the LED module, and the square wave generating module comprises a timer circuit capable of outputting a voltage signal with 50% duty ratio; the triangular wave generation module comprises a reference voltage circuit, an operational amplifier U21 and a resistance-capacitance integration circuit; the current adjusting module comprises a voltage divider circuit, an operational amplifier U31, a triode T31 and a current detection resistor R33; the LED module comprises an LED string consisting of at least one LED light source.
The further improvement lies in that: the triangular wave generation module comprises an operational amplifier U21, resistors R21, R22 and R23 and a capacitor C21, wherein one end of the resistor R21 is pulled up to 5V voltage, the other end of the resistor R22 is connected with one end of the resistor R22 in series, the other end of the resistor R22 is connected to the ground, a common end of the resistors R21 and R22 is connected with an inverting input end of the operational amplifier U21, and the connection mode is a reference voltage circuit and provides a reference voltage for the operational amplifier U21; one end of a resistor R23 is connected with the output end of the square wave generation module, the other end of the resistor R23 is connected with the non-inverting input end of the operational amplifier U21, one end of a capacitor C21 is also connected with the non-inverting input end of the operational amplifier U21, the other end of the capacitor C21 is connected with the output end of the operational amplifier U21, and the connection mode is an integrating circuit, so that the operational amplifier U21 can be used for integrating operation, and square waves can be converted into triangular waves.
The further improvement lies in that: the triangular wave generation module converts the square wave signal into a triangular wave signal.
The further improvement lies in that: the current adjusting module comprises an operational amplifier U31, resistors R31, R32, R33 and a triode T31, one end of a resistor R31 is connected with the output end of the triangular wave generating module, the other end of the resistor R32 is connected with one end of a resistor R32 in series, the other end of the resistor R32 is connected to the ground, the common end of the resistors R31 and R32 is connected with the non-inverting input end of the operational amplifier U31, the connection mode is a voltage dividing circuit, and the triangular wave voltage signal output by the triangular wave generating module is divided and further adjusted to a proper voltage level; the resistor R33 is a current detection resistor, one end of the resistor R33 is connected to the ground, the other end of the resistor R33 is connected with the inverting input end of the operational amplifier U31, the current detection circuit is used for converting the current value of the LED into a voltage value, and the voltage value is input into the operational amplifier U31 for current detection; the base electrode of the triode is connected with the output end of the operational amplifier U31, the collector electrode of the triode is connected with the negative end of the LED module, and the emitter electrode of the triode is connected with the common end of the resistor R33 and the reverse input end of the operational amplifier U31.
The further improvement lies in that: the input end of the operational amplifier U31 in the current adjustment module in the closed loop state has a "virtual short" characteristic, that is, the potentials of the non-inverting input end and the inverting input end of the operational amplifier U31 are equal, a triangular wave voltage signal is applied to the non-inverting input end, based on the "virtual short" characteristic of the input end of the operational amplifier in the closed loop state, the output end of the operational amplifier U31 outputs a corresponding voltage signal to adjust the triode T31 to dynamically work in an amplification region or a cut-off region, so that the voltage across the current detection resistor R33, that is, the voltage across the inverting input end of the operational amplifier U31, is the same triangular wave voltage as the voltage across the non-inverting input end, and accordingly, the current across the current detection resistor R33 is also.
The further improvement lies in that: the current detection resistor R33 in the current adjustment module is connected with the LED of the LED module in series, so that the current of the LED is triangular wave current, and the dynamic respiration effect of the LED is realized.
The further improvement lies in that: the operational amplifier U21 in the triangular wave generation module has a "virtual short" characteristic in a closed loop state, that is, the potentials of the non-inverting input end and the inverting input end of the operational amplifier U21 are equal, so that the square wave is converted into the triangular wave when the operational amplifier U21 in the integrating circuit of the triangular wave generation module performs the integrating operation.
The invention has the beneficial effects that: only a circuit built by hardware is needed, a Microcontroller (MCU) and an LED driver are not added, and corresponding software programs do not need to be additionally developed, so that the principle and the structure of the control circuit are simple and easy to realize; compared with the prior art, the cost is obviously reduced, and the hardware circuit adopted by the invention only generates low-frequency signals, so that the influence on the EMC is obviously reduced, and the EMC performance is good.
Drawings
FIG. 1 is a schematic diagram of a hardware design circuit structure of the present invention.
Fig. 2 is a current schematic of an LED of the present invention.
Fig. 3 is a schematic diagram of a square wave signal of the present invention.
Fig. 4 is a schematic circuit diagram of the square wave generating module of the present invention.
Fig. 5 is a schematic diagram of a triangular wave signal output by the triangular wave generating module of the present invention.
Wherein: the LED light source comprises a 10-square wave generation module, a 20-triangular wave generation module, a 30-current regulation module and a 40-LED module.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
It should be noted that the time period value, the LED current range value, the LED voltage range value, the square wave voltage amplitude, the triangular wave voltage amplitude, and other related data values taken in this embodiment are preferred values in this embodiment, and the related values may be adjusted according to the specific project requirements and the design practical situation during the project design.
The breathing animation effect of the LED can be realized by dynamically and periodically adjusting the current of the LED. Setting the breathing mode of the LED to be a period from gradual brightness to gradual darkness every 3s as a breathing animation, gradually brightening the brightness of the LED from 0% to 100% within 0-1.5 s of each period of 3s, and gradually brightening the brightness of the LED from 100% to 0% within 1.5 s-3 s, so as to reciprocate; accordingly, the current of the LED is gradually increased from 0mA to 100mA within 0 to 1.5s of each period of 3s, and then gradually decreased from 100mA to 0mA within 1.5 s. Fig. 1 shows the change of the LED current corresponding to the LED breathing animation effect, where the LED current is a triangular wave current.
Fig. 2 is a schematic diagram of a hardware design circuit structure according to a preferred embodiment of the present invention, which includes a square wave generating module 10, a triangular wave generating module 20, a current adjusting module 30, and an LED module 40. The output end of the square wave generation module 10 is connected with the input end of the triangular wave generation module 20; the output end of the triangular wave generation module 20 is connected with the input end of the current regulation module 30; the output of the current regulation module 30 is connected to the negative terminal of the LED module 40.
The square wave generating module 10 is configured to output a square wave voltage signal with a fixed period and a duty ratio of 50%, in this embodiment, in order to meet the requirement that the brightness of the LED gradually increases within the first 1.5s of each period of the 3s and gradually decreases within the last 1.5s of each period of the 3s, the internal parameters of the square wave generating module 10 are adjusted, so that the output square wave is a voltage signal with a period of 3s, a duty ratio of 50%, and an amplitude of 5V, as shown in fig. 3. Fig. 4 is a circuit design structure diagram of an example of the square wave generation module, and a 555 timer is adopted and matched with components such as a peripheral resistor, a capacitor and a diode, so that a square wave voltage signal with a fixed period and a duty ratio of 50% can be output. The period time of the square wave generating module 10 breathing can be adjusted according to the actual design.
The triangular wave generating module 20 is used for converting the square wave voltage signal into a triangular wave voltage signal, and the triangular wave generating module 20 comprises an operational amplifier U21, resistors R21, R22, R23 and a capacitor C21. One end of the resistor R21 is pulled up to 5V voltage, the other end of the resistor R22 is connected with one end of the resistor R22 in series, the other end of the resistor R21 is connected with the ground, the common end of the resistors R21 and R22 is connected with the inverting input end of the operational amplifier U21, and the connection mode is a reference voltage circuit and provides a reference voltage for the operational amplifier U21; one end of the resistor R23 is connected with the output end of the square wave generation module 10, the other end is connected with the non-inverting input end of the operational amplifier U21, one end of the capacitor C21 is also connected with the non-inverting input end of the operational amplifier U21, and the other end is connected with the output end of the operational amplifier U21, and the connection mode is an integrating circuit, so that the operational amplifier U21 can be used for integrating operation to convert the square wave into a triangular wave; the resistances of the resistors R21 and R22 are adjusted to make the reference voltage 2.5V, and the capacitance values of R23 and C21 are adjusted to convert the square wave from the square wave generating module 10 into a triangular wave voltage signal with a period of 3s and an amplitude of 2.5V, as shown in fig. 5.
The current adjusting module 30 is used for adjusting the LED current in a triangular wave form to achieve the LED breathing animation effect. The current adjustment module 30 includes an operational amplifier U31, resistors R31, R32, R33, and a transistor T31. One end of the resistor R31 is connected with the output end of the triangular wave generation module 20, the other end is connected with one end of the resistor R32 in series, the other end of the resistor R32 is connected to the ground, the common end of the resistors R31 and R32 is connected with the non-inverting input end of the operational amplifier U31, the connection mode is a voltage divider circuit, the triangular wave voltage signal output by the triangular wave generation module 20 is divided and further adjusted to a proper voltage level, and then the required LED current is adjusted; the resistor R33 is a current detection resistor, one end of the resistor R33 is connected to the ground, the other end of the resistor R33 is connected with the inverting input end of the operational amplifier U31, the current detection circuit is used for converting the current value of the LED into a voltage value, and the voltage value is input into the operational amplifier U31 for current detection; the base of the triode T31 is connected to the output terminal of the operational amplifier U31, the collector is connected to the negative terminal of the LED module 40, and the emitter is connected to the common terminal of the resistor R33 and the inverting input terminal of the operational amplifier U31. Adjusting the resistance values of the resistors R31 and R32 to adjust the square wave from the square wave generation module 10 into a triangular wave voltage signal with a period of 3s and an amplitude of 0.1V; the resistance value of the current detection resistor R33 is adjusted to convert the current value of the LED into a voltage value, the current range of the LED is from 0mA to 100mA, and correspondingly, the current value is converted into a voltage range from 0V to 0.1V. The input end of the operational amplifier in the closed loop state has a 'virtual short' characteristic, namely, the potentials of the non-inverting input end and the inverting input end of the operational amplifier U31 are equal, a triangular wave voltage signal is applied to the non-inverting input end, in order to keep the non-inverting input end of the operational amplifier to have the 'virtual short' characteristic, the output end of the operational amplifier U31 outputs a corresponding voltage signal to adjust the triode T31 to dynamically work in an amplification region or a cut-off region, so that the voltage on the current detection resistor, namely the voltage of the inverting input end of the operational amplifier U31 is the same triangular wave voltage as the voltage of the non-inverting input end, correspondingly, the current on the current detection resistor R33 is also a triangular wave current, and the LED is connected in series with the current detection resistor R33, so that the current of the LED is also a triangular wave, and the.
The voltage connected to the positive terminal of the LED module 40 is 12V as shown in the figure or other power supply voltage, and includes at least one LED, and the LEDs may be connected in series or in parallel, and are selected according to actual design requirements.
The operational amplifier U21 of the triangular wave generation module 20 also has a "virtual short" characteristic in a closed loop state, that is, the potentials of the non-inverting input terminal and the inverting input terminal of the operational amplifier U21 are equal, and the "virtual short" characteristic is used here as an operation of converting a square wave into a triangular wave when the operational amplifier U21 in the integrating circuit of the triangular wave generation module 20 performs an integrating operation.
Claims (7)
1. The utility model provides a realize hardware design circuit of LED breathing animation effect which characterized in that: the LED lamp comprises a square wave generating module (10), a triangular wave generating module (20), a current adjusting module (30) and an LED module (40), wherein the output end of the square wave generating module (10) is connected with the input end of the triangular wave generating module (20); the output end of the triangular wave generation module (20) is connected with the input end of the current regulation module (30); the output end of the current adjusting module (30) is connected with the negative end of the LED module (40), and the square wave generating module comprises a timer circuit capable of outputting a voltage signal with 50% duty ratio; the triangular wave generation module (20) comprises a reference voltage circuit, an operational amplifier U21 and a resistance-capacitance integration circuit; the current adjusting module (30) comprises a voltage divider circuit, an operational amplifier U31, a triode T31 and a current detection resistor R33; the LED module comprises an LED string consisting of at least one LED light source.
2. The hardware design circuit for implementing LED breathing animation effects as recited in claim 1, wherein: the triangular wave generation module (20) comprises an operational amplifier U21, resistors R21, R22, R23 and a capacitor C21, wherein one end of the resistor R21 is pulled up to 5V voltage, the other end of the resistor R22 is connected with one end of the resistor R22 in series, the other end of the resistor R22 is connected to the ground, the common end of the resistors R21 and R22 is connected with the inverting input end of the operational amplifier U21, and the connection mode is a reference voltage circuit and provides a reference voltage for the operational amplifier U21; one end of a resistor R23 is connected with the output end of the square wave generation module, the other end of the resistor R23 is connected with the non-inverting input end of the operational amplifier U21, one end of a capacitor C21 is also connected with the non-inverting input end of the operational amplifier U21, the other end of the capacitor C21 is connected with the output end of the operational amplifier U21, and the connection mode is an integrating circuit, so that the operational amplifier U21 can be used for integrating operation, and square waves can be converted into triangular waves.
3. The hardware design circuit for implementing LED breathing animation effects as recited in claim 2, wherein: the triangular wave generation module (20) converts the square wave signal into a triangular wave signal.
4. The hardware design circuit for implementing LED breathing animation effects as recited in claim 1, wherein: the current adjusting module (30) comprises an operational amplifier U31, resistors R31, R32, R33 and a triode T31, one end of a resistor R31 is connected with the output end of the triangular wave generating module 20, the other end of the resistor R32 is connected with one end of a resistor R32 in series, the other end of the resistor R32 is connected to the ground, the common end of the resistors R31 and R32 is connected with the non-inverting input end of the operational amplifier U31, the connection mode is a voltage dividing circuit, and the triangular wave voltage signal output by the triangular wave generating module (20) is divided and further adjusted to a proper voltage level; the resistor R33 is a current detection resistor, one end of the resistor R33 is connected to the ground, the other end of the resistor R33 is connected with the inverting input end of the operational amplifier U31, the current detection circuit is used for converting the current value of the LED into a voltage value, and the voltage value is input into the operational amplifier U31 for current detection; the base electrode of the triode is connected with the output end of the operational amplifier U31, the collector electrode of the triode is connected with the negative end of the LED module, and the emitter electrode of the triode is connected with the common end of the resistor R33 and the reverse input end of the operational amplifier U31.
5. The hardware design circuit for implementing LED breathing animation effects as recited in claim 4, wherein: the input end of an operational amplifier U31 in the current adjusting module (30) in a closed loop state has a 'virtual short' characteristic, that is, the potentials of the non-inverting input end and the inverting input end of the operational amplifier U31 are equal, a triangular wave voltage signal is applied to the non-inverting input end, based on the 'virtual short' characteristic of the input end of the operational amplifier in the closed loop state, the output end of the operational amplifier U31 outputs a corresponding voltage signal to adjust the triode T31 to dynamically work in an amplification region or a cut-off region, so that the voltage on a current detection resistor R33, that is, the voltage on the inverting input end of the operational amplifier U31, is the same triangular wave voltage as the voltage on the non-inverting input end, and the current on a current detection resistor R33 is.
6. The hardware design circuit for implementing LED breathing animation effects as recited in claim 5, wherein: the current detection resistor R33 in the current adjusting module (30) is connected with the LED of the LED module (40) in series, and the current of the LED is triangular wave current, so that the dynamic respiration effect of the LED is realized.
7. The hardware design circuit for implementing LED breathing animation effects as recited in claim 2, wherein: the operational amplifier U21 in the triangular wave generation module (20) has the characteristic of 'virtual short' in a closed loop state, namely the potentials of the non-inverting input end and the inverting input end of the operational amplifier U21 are equal, so that the square wave is converted into the triangular wave when the operational amplifier U21 in the integrating circuit of the triangular wave generation module (20) performs the integrating operation.
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| CN202010585339.8A CN111836425A (en) | 2020-06-24 | 2020-06-24 | Hardware design circuit for realizing LED breathing animation effect |
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| CN202010585339.8A CN111836425A (en) | 2020-06-24 | 2020-06-24 | Hardware design circuit for realizing LED breathing animation effect |
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Application publication date: 20201027 |