CN219678725U - Deep dimming power supply for LED lamp - Google Patents
Deep dimming power supply for LED lamp Download PDFInfo
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- CN219678725U CN219678725U CN202320338223.3U CN202320338223U CN219678725U CN 219678725 U CN219678725 U CN 219678725U CN 202320338223 U CN202320338223 U CN 202320338223U CN 219678725 U CN219678725 U CN 219678725U
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Abstract
The utility model relates to the technical field of LED power supplies, and discloses a deep dimming power supply for an LED lamp, which aims to solve the technical problem that the power waste is caused by too bright due to the lack of deep dimming of the existing LED power supply.
Description
Technical Field
The utility model relates to the technical field of LED power supplies, in particular to a deep dimming power supply for an LED lamp.
Background
The brightness adjustment of LED fixtures is a critical function, especially where different brightness illumination is required, such as residential, commercial and industrial illumination. The dimming range refers to the brightness adjustment range that can be realized by the LED lamp, and in general, the larger the dimming range is, the wider brightness adjustment can be realized by the LED lamp, and different lighting requirements can be better satisfied.
The dimming range of the existing LED power supply can only reach 5-10% at the minimum, and the dimming ratio of 1% cannot be reached, so that the flexibility and the application range of the LED lamp are limited. In particular, a smaller dimming range may result in an LED luminaire that is too bright in certain applications. Meanwhile, flexible brightness adjustment is an energy-saving mode, and the dimming range is small, so that power can be excessively used, and energy waste is caused.
The utility model patent document with publication number CN206559687U discloses an LED dimming power supply, referring to the accompanying figure 1 and the specification [0009] section, the output end of a flyback power supply main control circuit 3 is electrically connected with the input end of an output rectifying and filtering circuit 4, and the output end of the output rectifying and filtering circuit 4 is connected with an LED load. It can be seen that the output rectifying and filtering circuit 4 directly outputs to the LED load, and the deep dimming is absent.
Disclosure of Invention
The utility model aims to provide a deep dimming power supply for an LED lamp, which aims to solve the technical problem that the existing LED power supply is too bright due to lack of deep dimming, so that power is wasted.
In order to achieve the above purpose, the specific technical scheme of the deep dimming power supply for the LED lamp is as follows:
the deep dimming power supply for the LED lamp comprises a rectifying circuit for converting commercial alternating current into direct current, wherein an anti-interference EMC circuit is arranged at the front stage of the rectifying circuit, a voltage conversion circuit for reducing voltage is arranged at the rear stage of the rectifying circuit, the voltage conversion circuit is connected with a control circuit for adjusting voltage, a DC constant current output circuit of the voltage conversion circuit comprises a DC-DC dimming circuit, the DC-DC dimming circuit is provided with a voltage reduction driver for deep dimming, the power input end of the voltage reduction driver is connected with the output positive electrode of the voltage conversion circuit, the enabling end of the voltage reduction driver is connected with the PWM output end of a singlechip, the singlechip is used for receiving an external dimming signal and outputting the PWM signal to the voltage reduction driver, the output positive electrode of the voltage conversion circuit is connected with the first end of an output interface, the first polarity current detection end of the voltage reduction driver is connected with the second end of the output interface through a current limiting resistor, and the second polarity current detection end of the voltage reduction driver is connected with the first end of the output interface through the current limiting resistor.
Further, the voltage conversion circuit comprises a transformer, the control circuit comprises a controller and an MOS tube controlled by the controller, the drain electrode of the MOS tube is connected with one end of the primary side of the transformer, the grid electrode of the MOS tube is connected with the driving end of the controller, the source electrode of the MOS tube is grounded through a pull-down resistor, the MOS tube is an NMOS tube, and the secondary side of the transformer is output to be used for the output anode of LED luminescence through the rectifying circuit.
The deep dimming power supply for the LED lamp has the following advantages:
the front stage of the rectifying circuit is provided with an EMC circuit for resisting interference, so that instability of the LED lamp caused by external interference can be reduced, and the stability and reliability of the LED lamp are improved; the rear stage of the rectifying circuit is provided with a voltage conversion circuit for reducing voltage, and can convert alternating current used in high-voltage markets into low-voltage direct current so as to meet the voltage requirement of the LED lamp; the voltage conversion circuit is connected with a control circuit for adjusting voltage, and the voltage of the LED lamp can be coarsely adjusted according to the requirement so as to adapt to different application occasions; the DC constant current output circuit can stably output constant current so as to ensure the working stability and the service life of the LED lamp, and the DC-DC dimming circuit of the technical scheme can realize the deep dimming control of the LED lamp through the step-down driver for deep dimming, improve the energy-saving effect of the LED lamp and reduce the electric power waste.
Drawings
FIG. 1 is a functional block diagram of a deep dimming power supply for an LED lamp provided by the utility model;
FIG. 2 is a block diagram of a voltage conversion circuit and a control circuit provided by the utility model;
fig. 3 is a block diagram of a DC-DC dimming circuit according to the present utility model.
In the figure: u4, a step-down driver; u12, a controller; ZD1, a voltage stabilizing tube; CON1, output interface; led+, output anode; q8, MOS tube; r6, a current limiting group; and T7, a transformer.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1 to 3, the deep dimming power supply for an LED lamp provided by the utility model includes a rectifying circuit for converting ac power for the market into DC power, an EMC circuit for anti-interference is disposed at a front stage of the rectifying circuit, a voltage conversion circuit for reducing voltage is disposed at a rear stage of the rectifying circuit, the voltage conversion circuit is connected with a control circuit for adjusting voltage, a DC constant current output circuit of the voltage conversion circuit includes a DC-DC dimming circuit, the DC-DC dimming circuit is provided with a buck driver U4 for deep dimming, a power input end of the buck driver U4 is connected with an output positive led+ of the voltage conversion circuit, an enabling end of the buck driver U4 is connected with a PWM output end of a single chip microcomputer, the single chip microcomputer is used for receiving an external dimming signal and outputting the PWM signal to the buck driver U4, the output positive led+ of the voltage conversion circuit is connected with a first end of an output interface CON1, a first polarity current detection end of the buck driver U4 is connected with a second end of the output interface CON1 through a current limiting resistor R6, and a first polarity current detection end of the buck driver U4 is connected with a first end of the output interface CON1 through a capacitive coupling interface.
The front stage of the rectifying circuit is provided with an EMC circuit for resisting interference, so that instability of the LED lamp caused by external interference can be reduced, and stability and reliability of the LED lamp are improved. The rear stage of the rectifying circuit is provided with a voltage conversion circuit for reducing voltage, and can convert alternating current used in high-voltage markets into low-voltage direct current so as to meet the voltage requirement of the LED lamp. The voltage conversion circuit is connected with a control circuit for adjusting voltage, and the voltage of the LED lamp can be coarsely adjusted according to the requirement so as to adapt to different application occasions. The DC constant current output circuit can stably output constant current so as to ensure the working stability and the service life of the LED lamp. According to the DC-DC dimming circuit, through the step-down driver U4 for deep dimming, deep dimming control of the LED lamp can be achieved, and the adjustability and energy-saving effect of the LED lamp are improved. The singlechip is used for receiving an external dimming signal and outputting a PWM signal to the step-down driver U4, so that the LED lamp is accurately controlled. The output positive pole LED+ is connected with the first end of the output interface CON1, the first polarity current detection end of the voltage reduction driver U4 is connected with the second end of the output interface CON1 through the current limiting resistor R6, the second polarity current detection end of the voltage reduction driver U4 is connected with the first end of the output interface CON1 through the coupling capacitor, and an LED power supply can be connected with a power line of an LED lamp, so that the voltage reduction driver U4 is convenient and practical.
Referring to fig. 2, the voltage conversion circuit includes a transformer T7, the control circuit includes a controller U12, a MOS transistor Q8 controlled by the controller U12, a drain electrode of the MOS transistor Q8 is connected with one end of a primary side of the transformer T7, a gate electrode of the MOS transistor is connected with a driving end of the controller U12, a source electrode of the MOS transistor Q8 is grounded through a pull-down resistor, the MOS transistor Q8 is an NMOS transistor, and a secondary side of the transformer T7 outputs an output positive electrode led+ for LED light emission through a rectifying circuit.
The controller U12 can control the MOS transistor Q8, and control the output voltage and current by adjusting the on time and the off time of the MOS transistor Q8. The MOS transistor Q8 is used as a power switch, and has the characteristics of low on-resistance and high switching speed, so that the switching loss of the circuit is reduced, and the efficiency is improved. The drain electrode of the MOS tube Q8 is grounded through a pull-down resistor, so that the problems of voltage surge, electrostatic breakdown and the like can be avoided, and the reliability and stability of the circuit are improved.
Specifically, the 2 nd end of the buck driver U4 is connected with the output positive electrode led+ of the voltage conversion circuit through a resistor R2 and a voltage stabilizing tube ZD1, the 2 nd end of the buck driver U4 is also connected with the collector of an NPN triode Q3 through a resistor R4, the base of the triode Q3 is connected with the PWM output end of the singlechip, and the emitter of the triode Q3 is connected to the ground SGND, namely, one end of the secondary coil of the transformer T7. The 3 rd end of the step-down driver U4 is connected to the ground SGND through a capacitor C6, and alternating current ripple on the reference voltage is filtered to realize linear dimming; the 4 th end of the buck driver U4 is directly connected to the ground SGND; the 5 th end and the 6 th end of the voltage reduction driver U4 are drains of the internal MOS, and are commonly connected with an output positive electrode LED+ of the voltage conversion circuit through a diode D1, wherein a cathode of the diode D1 is connected with the output positive electrode LED+ of the voltage conversion circuit, and an anode of the diode D1 is connected with the 5 th end of the voltage reduction driver U4; the second end of the output interface CON1 is connected with the 5 th end of the step-down driver U4 through a plurality of resistors connected in parallel and then through an inductor L1; the 1 st end of the step-down driver U4 is a second polarity current detection end and is connected with an output positive electrode LED+ of the voltage conversion circuit through a coupling capacitor, the coupling capacitor comprises a capacitor C3 and a capacitor C4, and the 1 st end of the step-down driver U4 is simultaneously connected with an inductor L1.
In summary, according to the deep dimming power supply for the LED lamp provided by the utility model, the front stage of the rectifying circuit is provided with the EMC circuit for resisting interference, so that the instability of the LED lamp caused by external interference can be reduced, and the stability and reliability of the LED lamp are improved; the rear stage of the rectifying circuit is provided with a voltage conversion circuit for reducing voltage, and can convert alternating current used in high-voltage markets into low-voltage direct current so as to meet the voltage requirement of the LED lamp; the voltage conversion circuit is connected with a control circuit for adjusting voltage, and the voltage of the LED lamp can be coarsely adjusted according to the requirement so as to adapt to different application occasions; the DC constant current output circuit can stably output constant current so as to ensure the working stability and the service life of the LED lamp, and the DC-DC dimming circuit of the technical scheme can realize the deep dimming control of the LED lamp through the step-down driver for deep dimming, improve the energy-saving effect of the LED lamp and reduce the electric power waste.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (2)
1. The deep dimming power supply for the LED lamp comprises a rectifying circuit for converting commercial alternating current into direct current, wherein an EMC circuit for resisting interference is arranged at the front stage of the rectifying circuit, a voltage conversion circuit for reducing voltage is arranged at the rear stage of the rectifying circuit, the voltage conversion circuit is connected with a control circuit for regulating voltage, and a DC constant current output circuit of the voltage conversion circuit is characterized in that the DC constant current output circuit comprises a DC-DC dimming circuit, the DC-DC dimming circuit is provided with a voltage reduction driver (U4) for deep dimming, the power input end of the voltage reduction driver (U4) is connected with an output positive electrode LED+ of the voltage conversion circuit, the enabling end of the voltage reduction driver (U4) is connected with a PWM output end of a singlechip, the singlechip is used for receiving an external dimming signal and outputting the PWM signal to the voltage reduction driver (U4), an output positive electrode LED+ of the voltage conversion circuit is connected with a first end of an output interface (CON 1), and a polarity detection end of the voltage reduction driver (U4) is connected with a second end of the voltage reduction driver (C1) through a current limit resistor (R6) and a second end of the voltage reduction driver (U1) through a current limit resistor (CON 1).
2. The deep dimming power supply for the LED lamp according to claim 1, wherein the voltage conversion circuit comprises a transformer (T7), the control circuit comprises a controller (U12), a MOS tube (Q8) controlled by the controller (U12), a drain electrode of the MOS tube (Q8) is connected with one end of a primary side of the transformer (T7), a grid electrode of the MOS tube is connected with a driving end of the controller (U12), a source electrode of the MOS tube (Q8) is grounded through a pull-down resistor, the MOS tube (Q8) is an NMOS tube, and a secondary side of the transformer (T7) outputs an output positive electrode LED+ for LED luminescence through a rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320338223.3U CN219678725U (en) | 2023-02-28 | 2023-02-28 | Deep dimming power supply for LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320338223.3U CN219678725U (en) | 2023-02-28 | 2023-02-28 | Deep dimming power supply for LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN219678725U true CN219678725U (en) | 2023-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320338223.3U Active CN219678725U (en) | 2023-02-28 | 2023-02-28 | Deep dimming power supply for LED lamp |
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| Country | Link |
|---|---|
| CN (1) | CN219678725U (en) |
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2023
- 2023-02-28 CN CN202320338223.3U patent/CN219678725U/en active Active
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