CN219577316U - LED dimming and switching control circuit - Google Patents
LED dimming and switching control circuit Download PDFInfo
- Publication number
- CN219577316U CN219577316U CN202320640606.6U CN202320640606U CN219577316U CN 219577316 U CN219577316 U CN 219577316U CN 202320640606 U CN202320640606 U CN 202320640606U CN 219577316 U CN219577316 U CN 219577316U
- Authority
- CN
- China
- Prior art keywords
- resistor
- terminal
- triode
- control circuit
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses an LED dimming and switching control circuit, and relates to the technical field of LED control circuits. The LED dimming and switching control circuit comprises an AC input end, a rectification filter circuit connected with the AC input end and a power switch connected with the rectification filter circuit; the rectification filter circuit and the power switch are connected with the PWM control end, and the power switch is also connected with the high-frequency isolation transformer T1; further comprises: the LED voltage feedback end is connected with the feedback control end, the constant current control circuit is connected with the LED voltage feedback end, the switch control circuit is connected with the constant current control circuit, and the PWM dimming circuit is also connected with the first rectifying filter and the feedback control end. The improved control circuit eliminates MCU, realizes constant current, switching and dimming of load by using simple discrete elements, and has simple and reliable circuit and low cost.
Description
Technical Field
The utility model relates to the technical field of LED control circuits, in particular to an LED dimming and switching control circuit.
Background
An LED constant current power supply is one type of LED power supply, and is a voltage converter that converts a power supply into a specific voltage and current to drive an LED to emit light.
The traditional AC-DC constant-current power supply only has one path of constant-current direct output circuit, and does not comprise an LED voltage feedback, LED load control switching part and a PWM dimming part. The functions are mainly controlled by an MCU, and the MCU controls the switching and dimming of the LED load by receiving external signals. MCU control peripheral circuit is comparatively complicated, easily causes the malfunction because of external interference and the cost is higher.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the utility model provides an LED dimming and switching control circuit, which solves the problems that MCU control is adopted, and the MCU controls the switching and dimming of an LED load by receiving external signals. MCU control peripheral circuit is comparatively complicated, easily causes the problem that malfunction and cost are higher because of external interference.
(II) technical scheme
In order to achieve the above purpose, the utility model is realized by the following technical scheme: the LED dimming and switching control circuit comprises an AC input end, a rectification filter circuit connected with the AC input end and a power switch connected with the rectification filter circuit;
the rectification filter circuit and the power switch are both connected with the PWM control end, the power switch is also connected with the high-frequency isolation transformer T1, the output of the high-frequency isolation transformer T1 is connected with the rectification filter I and the rectification filter II, the rectification filter II is connected with the LED load, the rectification filter I is connected with the feedback control end, and the optical coupler U2 is connected between the feedback control end and the PWM control end;
further comprises:
the LED voltage feedback end is connected with the feedback control end, the constant current control circuit is connected with the LED voltage feedback end, the switch control circuit is connected with the constant current control circuit, and the PWM dimming circuit is also connected with the first rectifying filter and the feedback control end.
Further, the constant current control circuit comprises a three-terminal voltage stabilizer U1, a capacitor C1, a resistor R7, a MOS tube Q2 and a resistor R10, wherein the cathode of the three-terminal voltage stabilizer U1 is connected with one wiring terminal of the capacitor C1 and the grid electrode of the MOS tube Q2, the anode of the three-terminal voltage stabilizer U1 is connected with one wiring terminal of the resistor R7 and one wiring terminal of the resistor R10, the other wiring terminal of the capacitor C1 is connected with the other wiring terminal of the resistor R7, the other wiring terminal of the resistor R10 is connected with the source electrode of the MOS tube Q2, the drain electrode of the MOS tube Q2 is connected with an LED load, and the three-terminal voltage stabilizer U1 is connected with the PWM dimming circuit.
Further, the switch control circuit comprises a resistor R2, a resistor R6, a resistor R8, a triode Q1, a triode Q4, a resistor R12, a resistor R13 and a capacitor C2, wherein one wiring terminal of the resistor R2 is connected with one wiring terminal of the resistor R6 and an emitter of the triode Q1, a base electrode of the triode Q1 is connected with the other wiring terminal of the resistor R6 and one wiring terminal of the resistor R8, a collector electrode of the triode Q1 is connected with one wiring terminal of the capacitor C2, the other wiring terminal of the capacitor C2 is connected with one wiring terminal of the resistor R13 and an emitter of the triode Q4, a collector electrode of the triode Q4 is connected with the other wiring terminal of the resistor R8, a base electrode of the triode Q4 is connected with the other wiring terminal of the resistor R13 and one wiring terminal of the resistor R12, and two wiring terminals of the capacitor C2 are connected with the PWM dimming circuit.
Further, the PWM dimming circuit includes a resistor R3, a resistor R9, a diode D2, a triode Q3, a triode Q5, a resistor R11, a resistor R14 and a resistor R15, one terminal of the resistor R3 is connected with the anode of the diode D2, the other terminal is connected with one terminal of the resistor R9, the other terminal of the resistor R9 is connected with the collector of the triode Q5, one terminal of the resistor R5 and the base of the triode Q3, the collector of the triode Q3 is connected with the cathode of the diode D2, the base of the triode Q5 is connected with one terminal of the resistor R14 and one terminal of the resistor R11, and the other terminal of the resistor R14 and the resistor R15 is connected with the emitter of the triode Q5 and the emitter of the triode Q3.
Further, the LED voltage feedback end comprises a diode D1 and a resistor R1, wherein the cathode of the diode D1 is connected with one terminal of the resistor R1, and the other terminal of the resistor R1 is connected with an LED load.
(III) beneficial effects
The utility model provides an LED dimming and switching control circuit. The beneficial effects are as follows:
the improved control circuit eliminates MCU, realizes constant current, switching and dimming of load by using simple discrete elements, and has simple and reliable circuit and low cost.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of the present utility model;
fig. 2 is a diagram of an LED voltage feedback terminal, a constant current control circuit, a switch control circuit, and a PWM dimming circuit according to the present utility model.
In the figure: 1. an AC input; 2. a rectifying and filtering circuit; 3. a power switch; 4. a PWM control end; 5. a rectifying filter I; 6. a second rectifying filter; 7. an LED load; 8. a feedback control end; 9. an LED voltage feedback end; 10. a constant current control circuit; 11. a switch control circuit; 12. PWM dimming circuit.
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.
Referring to fig. 1-2, the present utility model provides a technical solution: the LED dimming and switching control circuit comprises an AC input end 1, a rectifying and filtering circuit 2 connected with the AC input end 1 and a power switch 3 connected with the rectifying and filtering circuit 2;
the rectification filter circuit 2 and the power switch 3 are both connected with the PWM control end 4, the power switch 3 is also connected with the high-frequency isolation transformer T1, the output of the high-frequency isolation transformer T1 is connected with the first rectification filter 5 and the second rectification filter 6, the second rectification filter 6 is connected with the LED load 7, the first rectification filter 5 is connected with the feedback control end 8, and the optical coupler U2 is connected between the feedback control end 8 and the PWM control end 4; (the above circuits are all connected by the conventional circuit, and the circuit layout is shown in FIG. 1, which is not repeated here)
Further comprises:
the LED voltage feedback end 9 connected with the feedback control end 8, the constant current control circuit 10 connected with the LED voltage feedback end 9, the switch control circuit 11 connected with the constant current control circuit 10 and the PWM dimming circuit 12, wherein the constant current control circuit 10 is also connected with the first rectifying filter 5 and the feedback control end 8.
The LED voltage feedback end 9, the constant current control circuit 10, the switch control circuit 11 and the PWM dimming circuit 12 replace the existing MCU control chip, and the following combination of the LED voltage feedback end 9, the constant current control circuit 10, the switch control circuit 11 and the PWM dimming circuit 12 is taken as an example for introduction:
the constant current control circuit 10 comprises a three-terminal voltage stabilizer U1, a capacitor C1, a resistor R7, a MOS tube Q2 and a resistor R10, wherein the cathode of the three-terminal voltage stabilizer U1 is connected with one wiring terminal of the capacitor C1 and the grid electrode of the MOS tube Q2, the anode of the three-terminal voltage stabilizer U1 is connected with one wiring terminal of the resistor R7 and one wiring terminal of the resistor R10, the other wiring terminal of the capacitor C1 is connected with the other wiring terminal of the resistor R7, the other wiring terminal of the resistor R10 is connected with the source electrode of the MOS tube Q2, the drain electrode of the MOS tube Q2 is connected with the LED load 7, and the three-terminal voltage stabilizer U1 is connected with the PWM dimming circuit 12. The voltage of the resistor R10 is detected to be used as a basis for controlling the constant current.
The switch control circuit 11 comprises a resistor R2, a resistor R6, a resistor R8, a triode Q1, a triode Q4, a resistor R12, a resistor R13 and a capacitor C2, wherein one wiring terminal of the resistor R2 is connected with one wiring terminal of the resistor R6 and an emitter of the triode Q1, a base electrode of the triode Q1 is connected with the other wiring terminal of the resistor R6 and one wiring terminal of the resistor R8, a collector electrode of the triode Q1 is connected with one wiring terminal of the capacitor C2, the other wiring terminal of the capacitor C2 is connected with one wiring terminal of the resistor R13 and an emitter of the triode Q4, a collector electrode of the triode Q4 is connected with the other wiring terminal of the resistor R8, a base electrode of the triode Q4 is connected with the other wiring terminal of the resistor R13 and one wiring terminal of the resistor R12, and two wiring terminals of the capacitor C2 are connected with the PWM dimming circuit 12. The purpose of the switch is achieved by controlling the power supply of the constant current circuit.
The PWM dimming circuit 12 comprises a resistor R3, a resistor R9, a diode D2, a triode Q3, a triode Q5, a resistor R11, a resistor R14 and a resistor R15, wherein one terminal of the resistor R3 is connected with the anode of the diode D2, the other terminal of the resistor R9 is connected with one terminal of the resistor R9, the other terminal of the resistor R9 is connected with the collector of the triode Q5, one terminal of the resistor R15 and the base of the triode Q3, the collector of the triode Q3 is connected with the cathode of the diode D2, the base of the triode Q5 is connected with one terminal of the resistor R14 and one terminal of the resistor R11, and the other terminal of the resistor R14 and the other terminal of the resistor R15 are connected with the emitter of the triode Q5 and the emitter of the triode Q3. As shown in fig. 2, two terminals of the capacitor C2 are further connected to one terminal of the resistor R3 and an emitter of the triode Q5, respectively, a cathode of the three-terminal voltage regulator U1 is further connected to an anode of the diode D2, and an anode of the three-terminal voltage regulator U1 is further connected to the emitter. The current of the LED lamp is controlled by the duty ratio of the input PWM signal to realize the aim of dimming.
The LED voltage feedback terminal 9 comprises a diode D1 and a resistor R1, wherein the cathode of the diode D1 is connected with one terminal of the resistor R1, and the other terminal of the resistor R1 is connected with the LED load 7. When the LED voltage is insufficient, the output voltage from AC to DC is adjusted so as to meet the LED output voltage.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An LED dimming and switching control circuit comprises an AC input end (1), a rectifying and filtering circuit (2) connected with the AC input end (1) and a power switch (3) connected with the rectifying and filtering circuit (2);
the rectification filter circuit (2) and the power switch (3) are both connected with the PWM control end (4), the power switch (3) is also connected with the high-frequency isolation transformer T1, the output of the high-frequency isolation transformer T1 is connected with the rectification filter I (5) and the rectification filter II (6), the rectification filter II (6) is connected with the LED load (7), the rectification filter I (5) is connected with the feedback control end (8), and the optical coupler U2 is connected between the feedback control end (8) and the PWM control end (4);
characterized by further comprising:
the LED dimming control circuit comprises an LED voltage feedback end (9) connected with a feedback control end (8), a constant current control circuit (10) connected with the LED voltage feedback end (9), a switch control circuit (11) connected with the constant current control circuit (10) and a PWM dimming circuit (12), wherein the constant current control circuit (10) is also connected with a rectifying filter I (5) and the feedback control end (8).
2. The LED dimming, switching control circuit of claim 1, wherein: the constant current control circuit (10) comprises a three-terminal voltage stabilizer U1, a capacitor C1, a resistor R7, a MOS tube Q2 and a resistor R10, wherein the cathode of the three-terminal voltage stabilizer U1 is connected with one wiring end of the capacitor C1 and the grid electrode of the MOS tube Q2, the anode of the three-terminal voltage stabilizer U1 is connected with one wiring end of the resistor R7 and one wiring end of the resistor R10, the other wiring end of the capacitor C1 is connected with the other wiring end of the resistor R7, the other wiring end of the resistor R10 is connected with the source electrode of the MOS tube Q2, the drain electrode of the MOS tube Q2 is connected with the LED load (7), and the three-terminal voltage stabilizer U1 is connected with the PWM dimming circuit (12).
3. The LED dimming, switching control circuit of claim 1, wherein: the switch control circuit (11) comprises a resistor R2, a resistor R6, a resistor R8, a triode Q1, a triode Q4, a resistor R12, a resistor R13 and a capacitor C2, wherein one wiring terminal of the resistor R2 is connected with one wiring terminal of the resistor R6 and an emitter of the triode Q1, a base electrode of the triode Q1 is connected with the other wiring terminal of the resistor R6 and one wiring terminal of the resistor R8, a collector electrode of the triode Q1 is connected with one wiring terminal of the capacitor C2, the other wiring terminal of the capacitor C2 is connected with one wiring terminal of the resistor R13 and an emitter of the triode Q4, a collector electrode of the triode Q4 is connected with the other wiring terminal of the resistor R8, a base electrode of the triode Q4 is connected with the other wiring terminal of the resistor R13 and one wiring terminal of the resistor R12, and two wiring terminals of the capacitor C2 are connected with the PWM dimming circuit (12).
4. The LED dimming, switching control circuit of claim 1, wherein: the PWM dimming circuit (12) comprises a resistor R3, a resistor R9, a diode D2, a triode Q3, a triode Q5, a resistor R11, a resistor R14 and a resistor R15, wherein one terminal of the resistor R3 is connected with the anode of the diode D2, the other terminal of the resistor R9 is connected with one terminal of the resistor R9, the other terminal of the resistor R9 is connected with the collector of the triode Q5, one terminal of the resistor R5 and the base of the triode Q3, the collector of the triode Q3 is connected with the cathode of the diode D2, the base of the triode Q5 is connected with one terminal of the resistor R14 and one terminal of the resistor R11, and the other terminal of the resistor R14 and the resistor R15 are connected with the emitter of the triode Q5 and the emitter of the triode Q3.
5. The LED dimming, switching control circuit of claim 1, wherein: the LED voltage feedback end (9) comprises a diode D1 and a resistor R1, wherein the cathode of the diode D1 is connected with one terminal of the resistor R1, and the other terminal of the resistor R1 is connected with an LED load (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320640606.6U CN219577316U (en) | 2023-03-28 | 2023-03-28 | LED dimming and switching control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320640606.6U CN219577316U (en) | 2023-03-28 | 2023-03-28 | LED dimming and switching control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219577316U true CN219577316U (en) | 2023-08-22 |
Family
ID=87648898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320640606.6U Active CN219577316U (en) | 2023-03-28 | 2023-03-28 | LED dimming and switching control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219577316U (en) |
-
2023
- 2023-03-28 CN CN202320640606.6U patent/CN219577316U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102065600B (en) | LED dimming driving system | |
| US10517151B1 (en) | Linear constant-current LED light circuit | |
| CN103648202A (en) | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit | |
| CN115734428A (en) | Constant-power stepless dimming control system | |
| CN219577316U (en) | LED dimming and switching control circuit | |
| CN104981078A (en) | LED music lamp based on Bluetooth control | |
| US10805996B1 (en) | Dial segmented dimming circuit | |
| CN211267193U (en) | Based on thing networking voice control intelligence lighting switch | |
| CN212211443U (en) | double-PWM dimming circuit | |
| CN211352536U (en) | Constant current load circuit, backlight adjusting circuit, driving board card and electronic equipment | |
| CN204948408U (en) | A kind of LED music lamp based on Bluetooth control | |
| CN211378312U (en) | LED drive circuit of transformer substation | |
| CN212435587U (en) | Constant current output control circuit, switching power supply controller and switching power supply system | |
| CN200987076Y (en) | Charging emergent sun lamp circuit | |
| CN114390756A (en) | Intelligent driving controller for LED illuminating lamp | |
| CN210986538U (en) | Single live wire switch circuit based on relay | |
| CN211831252U (en) | Lamp dimming circuit | |
| CN210075657U (en) | Ripple current control LED power supply circuit | |
| CN204652730U (en) | A kind of High Power Factor LED dimming driving circuit | |
| CN109219191B (en) | Microwave induction dimming circuit | |
| CN217590586U (en) | Switching power supply circuit | |
| CN217643792U (en) | LED low-voltage emergency output adjustable power supply | |
| CN211630464U (en) | Intelligent light-operated brightness desk lamp control circuit | |
| CN211859956U (en) | Half-bridge LLC constant power circuit of adjusting luminance | |
| CN216134622U (en) | Low-power-consumption LED lamp circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |