CN220087514U - LED control circuit - Google Patents
LED control circuit Download PDFInfo
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- CN220087514U CN220087514U CN202221675995.8U CN202221675995U CN220087514U CN 220087514 U CN220087514 U CN 220087514U CN 202221675995 U CN202221675995 U CN 202221675995U CN 220087514 U CN220087514 U CN 220087514U
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- 238000005070 sampling Methods 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses an LED control circuit, which relates to the technical field of LED control and comprises a power supply module for supplying power; the infrared induction module is used for infrared induction; the brightness adjusting module is used for receiving the induction result and controlling the resistance change of the digital potential circuit; the dimming driving module is used for adjusting the width of the pulse signal; the LED control module is used for adjusting brightness; and the current sampling protection module is used for current sampling, amplifying, peak current detection and circuit protection. According to the LED control circuit, the two-way infrared induction control is carried out through the infrared induction module, the structure of the induction result is matched with the brightness adjustment module, the up-down adjustment of the resistance value and the resistance value preservation of the digital potential circuit are completed, the brightness adjustment of the LED is realized through the two-way infrared induction mode, and the overcurrent protection is realized through the sampling of peak current.
Description
Technical Field
The utility model relates to the technical field of LED control, in particular to an LED control circuit.
Background
The LED (Light Emitting Diode, light-emitting diode) has the advantages of high illumination efficiency and long service life, is popular with the masses, has wide application prospect, ensures that the brightness of a single LED is unchanged, cannot realize dynamic adjustment, has various colors or various brightnesses according to different voltages, realizes the change of the voltage in a singlechip mode at present, changes the brightness of the LED in a market mode, has more complicated control mode, needs more I/0 port resources, has high cost, and adopts a key mode in the adjustment mode of the brightness of the LED in most, so that the LED has trouble and needs to be improved.
Disclosure of Invention
The embodiment of the utility model provides an LED control circuit to solve the problems in the background art.
According to an embodiment of the present utility model, there is provided an LED control circuit including: the LED lamp comprises a power supply module, an infrared sensing module, a brightness adjusting module, a dimming driving module, an LED control module and a current sampling protection module;
the power supply module is used for providing electric energy and carrying out voltage reduction, rectification, filtering and voltage stabilization on the input electric energy;
the infrared induction module is connected with the power supply module and is used for carrying out infrared induction and outputting two infrared induction results;
the brightness adjusting module is connected with the infrared sensing module and is used for receiving a second infrared sensing result and controlling the resistance change trend of the digital potential circuit, receiving a first infrared sensing result and controlling the resistance of the digital potential circuit to rise and fall, and storing the resistance of the digital potential circuit;
the dimming driving module is connected with the power supply module and the brightness adjusting module and is used for outputting pulse signals according to the change of the resistance value of the brightness adjusting module and adjusting the width of the pulse signals;
the LED control module is connected with the dimming driving module and is used for receiving the pulse signals output by the dimming driving module and adjusting the electric energy input into the LED module circuit;
the current sampling protection module is connected with the LED control module, the dimming driving module and the power module, and is used for sampling the current input into the LED control module, amplifying the sampling result and detecting the peak current, and controlling the dimming driving module to work.
Compared with the prior art, the utility model has the beneficial effects that: according to the LED control circuit, the infrared sensing module is used for carrying out double-path infrared sensing control, the brightness adjusting module is matched with the structure of sensing results, the up-down adjustment of the resistance value and the resistance value preservation of the digital potential circuit are completed, the brightness adjustment of the LED is realized in a two-path infrared sensing mode, the brightness adjustment of the LED is driven by the dimming driving module, the current sampling protection module is used for completing the sampling of peak current in the LED control module, overcurrent protection is carried out, the safety of the LED control circuit is improved, the circuit does not need to be controlled by a single chip microcomputer program, more I/0 port resources are not needed, and the circuit is simple and low in cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of an LED control circuit according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of an LED control circuit according to an embodiment of the present utility model.
Fig. 3 is a circuit diagram of a connection of a current sampling protection module according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In embodiment 1, referring to fig. 1, an led control circuit includes: the device comprises a power supply module 1, an infrared sensing module 2, a brightness adjusting module 3, a dimming driving module 4, an LED control module 5 and a current sampling protection module 6;
specifically, the power module 1 is configured to provide electric energy and perform voltage reduction, rectification, filtering and voltage stabilization on input electric energy;
the infrared induction module 2 is connected with the power supply module 1 and is used for carrying out infrared induction and outputting two infrared induction results;
the brightness adjusting module 3 is connected with the infrared sensing module 2 and is used for receiving a second infrared sensing result and controlling the resistance change trend of the digital potential circuit, receiving a first infrared sensing result and controlling the resistance of the digital potential circuit to rise and fall, and storing the resistance of the digital potential circuit;
the dimming driving module 4 is connected with the power supply module 1 and the brightness adjusting module 3 and is used for outputting pulse signals according to the change of the resistance value of the brightness adjusting module 3 and adjusting the width of the pulse signals;
the LED control module 5 is connected with the dimming driving module 4 and is used for receiving the pulse signal output by the dimming driving module 4 and adjusting the electric energy input into the LED module circuit;
and the current sampling protection module 6 is connected with the LED control module 5, the dimming driving module 4 and the power module 1, and is used for sampling the current input into the LED control module 5, amplifying the sampling result and detecting the peak current, and controlling the dimming driving module 4 to work.
In a specific embodiment, the power module 1 may adopt a voltage stabilizing circuit composed of a transformer W, a rectifier T, a filter capacitor C1, a second capacitor C2, a third capacitor C3, and a voltage stabilizer IC1 to realize voltage reduction, rectification, filtering, and voltage stabilizing of the input electric energy, where the voltage stabilizer IC1 may be selected, but is not limited to 7805 chips to complete voltage stabilizing, and details are not repeated.
In this embodiment, referring to fig. 2, the infrared sensing module 2 includes a first infrared sensor J1, a second resistor R2, a first resistor R1, a first switching tube VT1, and a first indicator LED;
specifically, the power end of the first infrared sensor J1 and one end of the first resistor R1 are both connected with the output end of the power module 1, the output end of the first infrared sensor J1 is connected with the base electrode of the first switching tube VT1 through the second resistor R2, the emitter electrode of the first switching tube VT1 and the grounding end of the first infrared sensor J1 are both grounded, the collector electrode of the first switching tube VT1 is connected with the cathode of the first indicator light LED, and the LED of the first indicator light LED is connected with the other end of the first resistor R1.
Further, the infrared sensing module 2 further includes a second infrared sensing unit 202 and a second switching tube VT2;
specifically, the second infrared sensing unit 202 is configured to perform infrared sensing and output a second infrared sensing result;
the circuit structure of the second infrared sensing unit 202 is the same as the circuit structures of the first infrared sensor J1, the second resistor R2, the first resistor R1 and the first indicator light LED, the output end of the second infrared sensing unit 202 is connected to the base electrode of the second switching tube VT2, the emitter electrode of the second switching tube VT2 is grounded, and the collector electrode of the second switching tube VT2 is connected to the indicator end of the second infrared sensing unit 202.
In a specific embodiment, the first infrared sensor J1 may be selected from but not limited to SD02 type infrared sensors; the first switching tube VT1 and the second switching tube VT2 can be NPN type triodes, and the specific model is not limited;
it should be noted that the functions of the first infrared sensor J1 and the second infrared sensing unit 202 are different, the first infrared sensor J1 is used for controlling the resistance of the digital potential circuit to change, and the second infrared sensing unit 202 is used for controlling the resistance of the digital potential circuit to change in a rising or falling manner.
Further, the brightness adjusting module 3 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first key switch S1, and a digital potentiometer U1;
specifically, one end of the third resistor R3, one end of the fourth resistor R4, one end of the fifth resistor R5 and the eighth end of the digital potentiometer U1 are all connected to the output end of the power module 1, the other end of the third resistor R3 is connected to the collector of the first switching tube VT1 and the first end of the digital potentiometer U1, the other end of the fourth resistor R4 is connected to the collector of the second switching tube VT2 and the second end of the digital potentiometer U1, and the other end of the fifth resistor R5 is connected to the seventh end of the digital potentiometer U1 and grounded through the first key switch S1, and the fourth end of the digital potentiometer U1 is grounded.
In a specific embodiment, the digital potentiometer U1 may be an X9313 chip.
Further, the dimming driving module 4 includes a first diode D1, a first diode D2, a sixth resistor R6, a fourth capacitor C4, a pulse generator U2, and a fifth capacitor C5;
specifically, the cathode of the first diode D1 and the anode of the second diode are respectively connected to the third end and the sixth end of the digital potentiometer U1, the sixth end and the second end of the pulse generator U2 are both connected to the fifth end of the digital potentiometer U1 and are connected to the ground end through the fourth capacitor C4, the anode of the first diode D1 and the cathode of the second diode are both connected to the seventh end of the pulse generator U2 and are connected to the fourth end and the eighth end of the pulse generator U2 through the sixth resistor R6, and the fifth end of the pulse generator U2 is grounded through the fifth capacitor C5.
In a specific embodiment, the pulse generator U2 may be a 555-series integrated chip, where a pulse generating circuit is formed, and the specific model is not limited.
Further, the LED control module 5 includes a seventh resistor R7, a first power tube Q1, and an LED module;
specifically, one end of the seventh resistor R7 is connected to the third end of the pulse generator U2, the other end of the seventh resistor R7 is connected to the gate of the first power tube Q1, the source of the first power tube Q1 is connected to the ground end through the current detection module, and the drain of the first power tube Q1 is connected to the output end of the power module 1 through the LED module.
In a specific embodiment, the first power tube Q1 may be an N-channel enhancement MOS tube; the LED modules can be connected in series and then in parallel.
In this embodiment, referring to fig. 3, the current sampling protection module 6 includes an eighth resistor R8, an amplifying circuit, a first OP1, a third diode D3, a sixth capacitor C6, a ninth resistor R9, a fourth diode D4, a tenth resistor R10, an eleventh resistor R11, and a third switching tube VT3;
specifically, one end of the eighth resistor R8 is connected to the source of the first power tube Q1 and the input end of the amplifying circuit, the other end of the eighth resistor R8 is grounded, the output end of the amplifying circuit is connected to the in-phase end of the first operational amplifier OP1, the inverting end of the first operational amplifier OP1 is connected to the cathode of the third diode D3, one end of the sixth capacitor C6, one end of the ninth resistor R9 and the cathode of the fourth diode D4, the cathode of the third diode D3 is connected to the output end of the first operational amplifier OP1, the anode of the fourth diode D4 is connected to one end of the tenth resistor R10 and the base of the third switch tube VT3, the emitter of the third switch tube VT3 is connected to the other end of the tenth resistor R10, the other end of the ninth resistor R9, the other end of the sixth capacitor C6 and the ground through the eleventh resistor R11, and the collector of the third switch tube VT3 is connected to the eighth end of the pulse generator U2 and the output end of the power module 1.
In a specific embodiment, the amplifying circuit may use an operational amplifying circuit to complete the amplifying process of the sampling signal, which is not described herein; the first operational amplifier OP1 may be an OP07 operational amplifier; the third switching transistor VT3 may be an NPN transistor.
In the LED control circuit, the power module 1 supplies the electric energy required by the circuit, the first infrared sensor J1 and the second infrared sensing unit 202 perform control induction, when the first key switch S1 is pressed down, the seventh end of the digital potentiometer U1 is at a low level, after the first infrared sensor J1 senses an object, the first switching tube VT1 is conducted, so that the first end of the digital potentiometer U1 becomes at a low level, meanwhile, when the second infrared sensing unit 202 does not sense, the second switching tube VT2 is disconnected, the second end of the digital potentiometer U1 inputs a high level, at the moment, the resistance value of the digital potentiometer U1 is at an ascending stage, the number of times of the low level input to the first end of the digital potentiometer U1 is controlled by the number of times of the first infrared sensor J1, the resistance value is at an ascending stage when the first time is not input, when the resistance value needs to be reduced, the second infrared sensing unit 202 only needs to continuously detect the object, the second switch tube VT2 can be controlled to be conducted, the second end of the digital potentiometer U1 is continuously low level, when the resistance change is required to be restarted and the last resistance condition is required to be maintained, the first key switch S1 is only required to be opened, the pulse generator U2 regulates the width of an output pulse signal due to the change of the resistance of the digital potentiometer U1, so as to drive the conduction angle of the first power tube Q1, the electric energy condition of the LED module is controlled so as to regulate the brightness of the LED module, meanwhile, the eighth resistor R8 is used for current sampling, the amplifying circuit is used for conditioning the sampling signal, the first operational amplifier OP1 is used for peak current detection, when the peak current exceeds the breakdown voltage of the fourth diode D4, the third switch tube VT3 is conducted, the eighth end of the pulse generator U2 is grounded, the LED module stops working, overcurrent protection is carried out, the safety of the LED control circuit is improved, the circuit is not controlled by a singlechip program, does not need more I/0 port resources, and has simple circuit and low cost.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
- An LED control circuit, characterized in that,the LED control circuit includes: the LED lamp comprises a power supply module, an infrared sensing module, a brightness adjusting module, a dimming driving module, an LED control module and a current sampling protection module;the power supply module is used for providing electric energy and carrying out voltage reduction, rectification, filtering and voltage stabilization on the input electric energy;the infrared induction module is connected with the power supply module and is used for carrying out infrared induction and outputting two infrared induction results;the brightness adjusting module is connected with the infrared sensing module and is used for receiving a second infrared sensing result and controlling the resistance change trend of the digital potential circuit, receiving a first infrared sensing result and controlling the resistance of the digital potential circuit to rise and fall, and storing the resistance of the digital potential circuit;the dimming driving module is connected with the power supply module and the brightness adjusting module and is used for outputting pulse signals according to the change of the resistance value of the brightness adjusting module and adjusting the width of the pulse signals;the LED control module is connected with the dimming driving module and is used for receiving the pulse signals output by the dimming driving module and adjusting the electric energy input into the LED module circuit;the current sampling protection module is connected with the LED control module, the dimming driving module and the power module, and is used for sampling the current input into the LED control module, amplifying the sampling result and detecting the peak current, and controlling the dimming driving module to work.
- 2. The LED control circuit of claim 1, wherein the infrared sensing module comprises a first infrared sensor, a second resistor, a first switching tube, and a first indicator light;the power supply end of the first infrared sensor and one end of the first resistor are both connected with the output end of the power supply module, the output end of the first infrared sensor is connected with the base electrode of the first switch tube through the second resistor, the emitting electrode of the first switch tube and the grounding end of the first infrared sensor are both grounded, the collecting electrode of the first switch tube is connected with the cathode of the first indicator lamp, and the other end of the first indicator lamp is connected with the other end of the first resistor.
- 3. The LED control circuit of claim 2, wherein the infrared sensing module further comprises a second infrared sensing unit and a second switching tube;the second infrared induction unit is used for carrying out infrared induction and outputting a second infrared induction result;the circuit structure of the second infrared sensing unit is the same as that of the first infrared sensor, the second resistor, the first resistor and the first indicator lamp, the output end of the second infrared sensing unit is connected with the base electrode of the second switching tube, the emitter electrode of the second switching tube is grounded, and the collector electrode of the second switching tube is connected with the indicator end of the second infrared sensing unit.
- 4. The LED control circuit of claim 3, wherein the brightness adjustment module comprises a third resistor, a fourth resistor, a fifth resistor, a first key switch, a digital potentiometer;one end of the third resistor, one end of the fourth resistor, one end of the fifth resistor and the eighth end of the digital potentiometer are all connected with the output end of the power module, the other end of the third resistor is connected with the collector of the first switching tube and the first end of the digital potentiometer, the other end of the fourth resistor is connected with the collector of the second switching tube and the second end of the digital potentiometer, the other end of the fifth resistor is connected with the seventh end of the digital potentiometer and is grounded through the first key switch, and the fourth end of the digital potentiometer is grounded.
- 5. The LED control circuit of claim 4, wherein the dimming driving module comprises a first diode, a second diode, a sixth resistor, a fourth capacitor, a pulse generator, a fifth capacitor;the anodes of the first diode and the second diode are respectively connected with the third end and the sixth end of the digital potentiometer, the sixth end and the second end of the pulse generator are both connected with the fifth end of the digital potentiometer and are connected with the ground end through a fourth capacitor, the anodes of the first diode and the cathodes of the second diode are both connected with the seventh end of the pulse generator and are connected with the fourth end and the eighth end of the pulse generator through a sixth resistor, and the fifth end of the pulse generator is grounded through a fifth capacitor.
- 6. The LED control circuit of claim 5, wherein the LED control module comprises a seventh resistor, a first power tube, an LED module;one end of the seventh resistor is connected with the third end of the pulse generator, the other end of the seventh resistor is connected with the grid electrode of the first power tube, the source electrode of the first power tube is connected with the ground end through the current detection module, and the drain electrode of the first power tube is connected with the output end of the power supply module through the LED module.
- 7. The LED control circuit of claim 6, wherein the current sampling protection module comprises an eighth resistor, an amplifying circuit, a first op-amp, a third diode, a sixth capacitor, a ninth resistor, a fourth diode, a tenth resistor, an eleventh resistor, a third switching tube;one end of the eighth resistor is connected with the source electrode of the first power tube and the input end of the amplifying circuit, the other end of the eighth resistor is grounded, the output end of the amplifying circuit is connected with the in-phase end of the first operational amplifier, the inverting end of the first operational amplifier is connected with the cathode of the third diode, one end of the sixth capacitor, one end of the ninth resistor and the cathode of the fourth diode, the cathode of the third diode is connected with the output end of the first operational amplifier, the anode of the fourth diode is connected with one end of the tenth resistor and the base electrode of the third switching tube, the emitter of the third switching tube is connected with the other end of the tenth resistor, the other end of the ninth resistor, the other end of the sixth capacitor and the ground end through the eleventh resistor, and the collector of the third switching tube is connected with the eighth end of the pulse generator and the output end of the power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221675995.8U CN220087514U (en) | 2022-07-01 | 2022-07-01 | LED control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221675995.8U CN220087514U (en) | 2022-07-01 | 2022-07-01 | LED control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220087514U true CN220087514U (en) | 2023-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221675995.8U Active CN220087514U (en) | 2022-07-01 | 2022-07-01 | LED control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220087514U (en) |
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2022
- 2022-07-01 CN CN202221675995.8U patent/CN220087514U/en active Active
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