CN219761380U - High-frequency driving circuit for LED dimming power supply - Google Patents
High-frequency driving circuit for LED dimming power supply Download PDFInfo
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- CN219761380U CN219761380U CN202321167636.6U CN202321167636U CN219761380U CN 219761380 U CN219761380 U CN 219761380U CN 202321167636 U CN202321167636 U CN 202321167636U CN 219761380 U CN219761380 U CN 219761380U
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Abstract
The utility model discloses a high-frequency driving circuit for an LED dimming power supply, which comprises a power supply main circuit, a dimming signal processing circuit, a singlechip circuit, a driving circuit, a MOS tube Q1, a capacitor C1, a resistor R1 and a triode Q2, wherein the power supply main circuit is connected with the singlechip circuit; when the driving signal with high frequency Pulse Width (PWM) and low duty ratio is used, waveform is still ensured not to be distorted, and the lamp is maintained at a certain brightness and cannot be extinguished.
Description
Technical Field
The utility model relates to the field of LED power supplies, in particular to a high-frequency driving circuit for an LED dimming power supply.
Background
With the rapid development of the LED illumination industry, the LED lamps are used for illumination of various households and outdoor, so that the LED power supply market is vigorously developed, and the requirements on the LED power supply are higher and higher.
At present, most of dimming modes of an LED power supply adopt Pulse Width (PWM) for dimming, stroboscopic effect is generated, headache, eye fatigue and physical and mental fatigue are caused, the Pulse Width (PWM) is increased to 3.125KHZ, so that high-frequency avoidance can be achieved, but noise is also generated during dimming, the noise caused by dimming can be eliminated only by increasing the frequency of the Pulse Width (PWM) to 20K, and the waveform of a driving circuit is easily distorted when the dimming duty ratio is lower, for example, 0.1% duty ratio, so that a lamp is extinguished; accordingly, a high frequency driving circuit for an LED dimming power supply is urgently needed to solve the above-described problems.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a high frequency driving circuit for an LED dimming power supply.
The technical scheme adopted by the embodiment of the utility model for solving the technical problems is as follows: the utility model provides a high frequency drive circuit for LED power that adjusts luminance, includes power supply main circuit, dimming signal processing circuit, singlechip circuit, drive circuit, MOS pipe Q1, electric capacity C1, resistance R1 and triode Q2, power supply main circuit's input is connected with live wire L and zero line N, power supply main circuit output V+ end and GND end, MOS pipe Q1's source and GND end are connected, the lamps and lanterns inserts between V+ end and the drain electrode of MOS pipe Q1, MOS pipe Q1's grid is passed through drive circuit is connected with triode Q2's collecting electrode, triode Q2's base is connected with electric capacity C1's one end, resistance R1's one end, triode Q2's projecting pole and GND end respectively, dimming signal is connected with singlechip circuit's input through dimming signal processing circuit, singlechip circuit's output is connected with electric capacity C1's the other end and resistance R1's the other end respectively.
Further, the driving circuit comprises a triode Q3-5, a resistor R2-3 and a capacitor C2, the power supply main circuit outputs a VDD end and a VCC end, the grid electrode of the MOS transistor Q1 is respectively connected with the emitter electrode of the triode Q3 and the emitter electrode of the triode Q4, the collector electrode of the triode Q3 is respectively connected with the VDD end, one end of the resistor R2, one end of the capacitor C2 and one end of the resistor R3, the base electrode of the triode Q3 is respectively connected with the other end of the resistor R2, the collector electrode of the triode Q5 and the base electrode of the triode Q4, and the other end of the capacitor C2 is respectively connected with the other end of the resistor R3, the collector electrode of the triode Q2 and the base electrode of the triode Q5, and the emitter electrode of the triode Q4 and the GND end.
Further, the high-frequency driving circuit for the LED dimming power supply further comprises a diode D1, wherein the anode of the diode D1 is connected with the emitter of the triode Q2, and the cathode of the diode D1 is connected with the base of the triode Q2.
Further, the high-frequency driving circuit for the LED dimming power supply further comprises a diode D2, wherein the anode of the diode D2 is connected with the emitter of the triode Q5, and the cathode of the diode D2 is connected with the base of the triode Q5.
The utility model has the beneficial effects that: the high-frequency driving circuit for the LED dimming power supply comprises a power supply main circuit, a dimming signal processing circuit, a singlechip circuit, a driving circuit, a MOS tube Q1, a capacitor C1, a resistor R1 and a triode Q2, wherein the input end of the power supply main circuit is connected with a live wire L and a zero line N, the power supply main circuit outputs a V+ end and a GND end, the source electrode of the MOS tube Q1 is connected with the GND end, a lamp is connected between the V+ end and the drain electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the collector electrode of the triode Q2 through the driving circuit, the base electrode of the triode Q2 is respectively connected with one end of the capacitor C1, one end of the resistor R1, the emitter of the triode Q2 and the GND end, a dimming signal is connected with the input end of the singlechip circuit through the dimming signal processing circuit, and the output end of the singlechip circuit is respectively connected with the other end of the capacitor C1 and the other end of the resistor R1; by the structure, when a driving signal with high frequency Pulse Width (PWM) and low duty ratio is used, waveform is still ensured not to be distorted, so that the lamp is maintained at certain brightness and is not extinguished.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a functional block diagram of a high frequency drive circuit for an LED dimming power supply;
fig. 2 is a circuit schematic of a high frequency drive circuit for an LED dimming power supply.
Detailed Description
Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.
In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the present utility model, unless clearly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and may be connected directly or indirectly through an intermediary; the connecting device can be fixedly connected, detachably connected and integrally formed; may be a mechanical connection; may be a communication between two elements or an interaction between two elements. The specific meaning of the words in the utility model can be reasonably determined by a person skilled in the art in combination with the specific content of the technical solution.
Referring to fig. 1-2, a high-frequency driving circuit for an LED dimming power supply includes a power supply main circuit, a dimming signal processing circuit, a singlechip circuit, a driving circuit, a MOS transistor Q1, a capacitor C1, a resistor R1 and a triode Q2, wherein an input end of the power supply main circuit is connected with a live wire L and a zero wire N, a v+ end and a GND end of the power supply main circuit output, a source electrode of the MOS transistor Q1 is connected with the GND end, a lamp is connected between the v+ end and a drain electrode of the MOS transistor Q1, a gate electrode of the MOS transistor Q1 is connected with a collector electrode of the triode Q2 through the driving circuit, a base electrode of the triode Q2 is connected with one end of the capacitor C1, one end of the resistor R1, an emitter electrode of the triode Q2 and the GND end respectively, a dimming signal is connected with an input end of the singlechip circuit through the dimming signal processing circuit, and an output end of the singlechip circuit is connected with the other end of the capacitor C1 and the other end of the resistor R1 respectively.
The driving circuit comprises a triode Q3-5, a resistor R2-3 and a capacitor C2, wherein the power supply main circuit outputs a VDD end and a VCC end, the grid electrode of the MOS transistor Q1 is respectively connected with the emitter electrode of the triode Q3 and the emitter electrode of the triode Q4, the collector electrode of the triode Q3 is respectively connected with the VDD end, one end of the resistor R2, one end of the capacitor C2 and one end of the resistor R3, the base electrode of the triode Q3 is respectively connected with the other end of the resistor R2, the collector electrode of the triode Q5 and the base electrode of the triode Q4, and the other end of the capacitor C2 is respectively connected with the other end of the resistor R3, the collector electrode of the triode Q2 and the base electrode of the triode Q5, and the emitter electrode of the triode Q4 is connected with the GND end.
The high-frequency driving circuit for the LED dimming power supply further comprises a diode D1, wherein the anode of the diode D1 is connected with the emitter of the triode Q2, and the cathode of the diode D1 is connected with the base of the triode Q2.
The high-frequency driving circuit for the LED dimming power supply further comprises a diode D2, wherein the anode of the diode D2 is connected with the emitter of the triode Q5, and the cathode of the diode D2 is connected with the base of the triode Q5.
The working principle of the utility model is as follows:
the power supply circuit transmits the received alternating current input voltage to the two input ends of the power supply main circuit through the input live wire terminal L and the input zero line terminal N, the voltage is processed by the power supply main circuit and then is output to the V+ end, the VDD end, the VCC end and the GND end respectively, the lamp LED1 is connected to the two output ends of the power supply main circuit, meanwhile, a driving signal with the Pulse Width (PWM) of 100% duty ratio is output by the 7 th pin of the singlechip U1, the triode Q2 is conducted through the capacitor C1 and the resistor R1, and the driving voltage of the triode Q5 is pulled down by the triode Q2, so that the triode Q5 is cut off; the voltage VDD is used for conducting the MOS tube Q1 through the resistor R2 and the triode Q3, and the lamp LED1 is lightened; the diode D1 and the diode D2 are clamp diodes of the transistor Q2 and the transistor Q5, respectively.
When a dimmer is used for dimming to a Pulse Width (PWM) duty ratio of 0.1%, a dimming signal is connected to a 3 rd pin of a singlechip U1 through a dimming signal processing circuit, the singlechip U1 outputs a driving signal with the Pulse Width (PWM) of 0.1% duty ratio with the frequency of 20KHz through a 7 th pin of the singlechip U1 after analysis, and a triode Q2 and a triode Q5 are started and closed in an accelerating way through a capacitor C1 and a capacitor C2, so that the driving signal with the Pulse Width (PWM) of 0.1% duty ratio with the frequency of 20KHz is not distorted, the MOS tube Q1 can still be conducted, and the LED1 of the lamp can maintain the brightness with the Pulse Width (PWM) of 0.1% duty ratio under the frequency of 20 KHz; the utility model has the advantages that: by the structure, when a driving signal with high frequency and low Pulse Width (PWM) duty ratio is used, waveform is still ensured not to be distorted, so that the lamp is maintained at certain brightness and is not extinguished.
Of course, the present utility model is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications and substitutions without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are included in the scope of the present utility model as defined in the appended claims.
Claims (4)
1. A high frequency drive circuit for an LED dimming power supply, characterized by: the LED dimming circuit comprises a power supply main circuit, a dimming signal processing circuit, a singlechip circuit, a driving circuit, a MOS tube Q1, a capacitor C1, a resistor R1 and a triode Q2, wherein the input end of the power supply main circuit is connected with a live wire L and a zero wire N, the power supply main circuit outputs a V+ end and a GND end, the source electrode of the MOS tube Q1 is connected with the GND end, a lamp is connected between the V+ end and the drain electrode of the MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the collector electrode of the triode Q2 through the driving circuit, the base electrode of the triode Q2 is respectively connected with one end of the capacitor C1, one end of the resistor R1, the emitting electrode of the triode Q2 and the GND end, the dimming signal is connected with the input end of the singlechip circuit through the dimming signal processing circuit, and the output end of the singlechip circuit is respectively connected with the other end of the capacitor C1 and the other end of the resistor R1.
2. A high frequency driving circuit for an LED dimming power supply as claimed in claim 1, wherein: the driving circuit comprises a triode Q3-5, a resistor R2-3 and a capacitor C2, wherein the power supply main circuit outputs a VDD end and a VCC end, a grid electrode of the MOS transistor Q1 is respectively connected with an emitter electrode of the triode Q3 and an emitter electrode of the triode Q4, a collector electrode of the triode Q3 is respectively connected with the VDD end, one end of the resistor R2, one end of the capacitor C2 and one end of the resistor R3, a base electrode of the triode Q3 is respectively connected with the other end of the resistor R2, a collector electrode of the triode Q5 and a base electrode of the triode Q4, and the other end of the capacitor C2 is respectively connected with the other end of the resistor R3, the collector electrode of the triode Q2 and the base electrode of the triode Q5, and the emitter electrode of the triode Q4 and the GND end.
3. A high frequency driving circuit for an LED dimming power supply according to any one of claims 1 to 2, wherein: the diode D1 is connected with the emitter of the triode Q2 at the anode and connected with the base of the triode Q2 at the cathode.
4. A high frequency driving circuit for an LED dimming power supply as claimed in claim 2, wherein: the diode D2 is connected with the emitter of the triode Q5 at the anode and connected with the base of the triode Q5 at the cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321167636.6U CN219761380U (en) | 2023-05-15 | 2023-05-15 | High-frequency driving circuit for LED dimming power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321167636.6U CN219761380U (en) | 2023-05-15 | 2023-05-15 | High-frequency driving circuit for LED dimming power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219761380U true CN219761380U (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321167636.6U Active CN219761380U (en) | 2023-05-15 | 2023-05-15 | High-frequency driving circuit for LED dimming power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219761380U (en) |
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2023
- 2023-05-15 CN CN202321167636.6U patent/CN219761380U/en active Active
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