Stroboflash-free dialeable current-selecting LED (light-emitting diode) color and light adjusting power supply

Abstract

The utility model discloses a non-stroboscopic dialeable current-selecting LED (Light Emitting Diode) color-adjusting and light-adjusting power supply, and relates to the technical field of LED color-adjusting and light-adjusting. The color and light adjusting power supply comprises an EMC filter circuit, a rectifier bridge circuit, a power factor correction circuit, a flyback circuit, an isolation transformer, a DC constant voltage circuit, a feedback loop, a BUCK constant current color and light adjusting circuit, a DALI control module, a dial switch controller, a light adjusting pin controller, a current and voltage signal, a DALI digital signal and LED lighting equipment. According to the utility model, the DALI control master control sends out signals with specific frequency and wavelength, the signals are decoded by the DALI control module to output dimming signals to the power supplies, and independent control addresses are respectively provided for each power supply under the condition that a plurality of power supplies are connected in parallel, so that each lamp can be respectively controlled, and the problems of existing dimming stroboflash and smooth dimming process are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED dimming, in particular to a flicker-free, dialable, current-selectable LED dimming power supply. Background Art

[0002] With the continuous progress and development of lighting equipment, pure light can no longer meet people's needs, especially in hotel engineering lighting, smart home lighting, commercial lighting, outdoor lighting, etc. People hope that the lights can have some different changes to create various atmospheres and achieve energy-saving and environmental protection effects. Therefore, dimming is undoubtedly an important product of people's needs and technological development. LED lights based on semiconductor technology have brought unlimited development space for intelligent control. On this basis, dimming and color-adjusting LED lights came into being.

[0003] The use of intelligent lighting not only adds color to the space, but also brings a lot of convenience to people, provides more scene experiences, and even achieves energy saving, environmental protection, comfort and convenience. Among the changes in intelligent lighting control, dimming and color adjustment are the most commonly used.

[0004] Dimming: The brightness is adjustable from 3% to 100%. Commonly used scenes include using 3% moonlight for looking after children at night, 30% warm white light for watching TV, and 100% warm white light for dinner and parties.

[0005] Color adjustment: The color temperature is adjusted between warm white and pure white. Pure white can improve people's attention and is suitable for reading and learning; warm white makes people feel relaxed and is suitable for leisure and entertainment. Of course, due to the change of color, pure white is also suitable for hot weather, while warm white makes people feel warmer in winter.

[0006] However, more and more LED lighting currently requires color temperature and brightness control. The output current of existing dimming power supplies is difficult to control, resulting in inaccurate brightness adjustment of LED lamps, inaccurate color temperature, and serious dimming flicker problems.

[0007] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0008] In view of the problems in the related art, the utility model proposes a non-flickering and dial-code-selectable current LED dimming lighting power supply to overcome the above technical problems existing in the existing related art.

[0009] To this end, the specific technical solutions adopted by the utility model are as follows:

[0010] A flicker-free LED color temperature and brightness adjustable power supply with dial code selection of current, which includes: an EMC filter circuit, a rectifier bridge circuit, a power factor correction circuit, a flyback circuit, an isolation transformer, a DC constant voltage circuit, a feedback loop, a BUCK constant current color temperature and brightness adjustable circuit, a DALI control module, a dial switch control, a dimming pin control, current and voltage signals, DALI digital signals, and an LED lighting device;

[0011] Among them, the input end of the EMC filter circuit is connected to the mains power supply. The EMC filter circuit, the rectifier bridge circuit, the power factor correction circuit, the flyback circuit, the isolation transformer, the DC constant voltage circuit, the feedback loop, the BUCK constant current color temperature and brightness adjustable circuit, and the LED lighting device are connected in sequence. The other output end of the DC constant voltage circuit is connected to the feedback loop, and the output end of the feedback loop is connected to the feedback input end of the flyback circuit. The DALI control module is connected to the DALI digital signal. The output end of the BUCK constant current color temperature and brightness adjustable circuit is connected to the DALI control module through the current and voltage signals. The output end of the DALI control module is connected to the dimming pin control and the BUCK constant current color temperature and brightness adjustable circuit through the dial switch control.

[0012] Furthermore, the EMC filter circuit includes: a fuse F101, a varistor RV101, an inductor LF101, an inductor LF102, a safety capacitor CX101, and a terminal block TB101; the rectifier bridge circuit includes a rectifier bridge BD101;

[0013] Among them, the 4th pin of the terminal block TB101 is respectively connected to one end of the varistor RV101 and the input end of the inductor LF101. The 5th pin of the terminal block TB101 is respectively connected to one end of the fuse F101. The other end of the fuse F101 is connected to one end of the varistor RV101 and the other input end of the inductor LF101. The output end of the inductor LF101 is respectively connected to one end of the safety capacitor CX101 and the input end of the inductor LF102. The other output end of the inductor LF101 is respectively connected to the other end of the safety capacitor CX101 and the other input end of the inductor LF102. The two output ends of the inductor LF102 are both connected to the rectifier bridge BD101.

[0014] Furthermore, the power factor correction circuit includes: capacitors C101, C102, resistors R100, R101, R102, R103, R117, R118, a field effect transistor Q102, a diode D100, a capacitor CE100, and an inductor L101;

[0015] Among them, the output terminals of the rectifier bridge BD101 are respectively connected to one end of the capacitor C101 and one end of the inductor L101. The other output terminal of the rectifier bridge BD101 is respectively connected to the other end of the capacitor C101, one end of the capacitor C102, and one end of the capacitor CE100. The other end of the inductor L101 is respectively connected to the other end of the capacitor C102, the anode of the diode, one end of the resistor R118, one end of the resistor R100, one end of the resistor R103, one end of the resistor R105, one end of the capacitor C103, and the input terminal of the transformer T100_A. The other end of the capacitor CE100 is respectively connected to the cathode of the diode D10 and one end of the resistor R117. The other end of the resistor R118 is connected to the other end of the resistor R117. The other end of the resistor R100 is connected to one end of the resistor R101. The other end of the resistor R103 is connected to one end of the resistor R102. The other end of the resistor R102 is connected to the drain of the field effect transistor Q102. The gate of the field effect transistor Q102 is connected to the other end of the resistor R101. The source of the field effect transistor Q102 is respectively connected to one end of the resistor R113, one end of the capacitor CE101, one end of the capacitor C105, and the first pin of the chip U101.

[0016] Further, the flyback circuit includes: the resistor R105, the resistor R106, the resistor R107, the capacitor C103, and the diode D104;

[0017] Among them, one end of the resistor R105 and one end of the capacitor C103 are both connected to the input terminal of the transformer T100_A. The other end of the resistor R105 is connected to one end of the resistor R106. The other end of the capacitor C103 is respectively connected to the other end of the resistor R106 and one end of the resistor R107. The other end of the resistor R107 is connected to the cathode of the diode D104. The anode of the diode D104 is respectively connected to the input terminal of the transformer T100_A and the drain of the field effect transistor Q101.

[0018] Further, the DC constant voltage circuit includes the diode D201, the diode D303, the capacitor CE201, the capacitor CE301, the resistor R202, and the resistor R300;

[0019] Among them, the anode of the diode D201 is connected to the output terminal of the transformer T100_A. The cathode of the diode D201 is respectively connected to one end of the capacitor CE201 and one end of the resistor R202. The other end of the capacitor CE201 is connected to the other end of the resistor R202;

[0020] The anode of the diode D303 is connected to the output terminal of the transformer T100_A. The cathode of the diode D303 is connected to one end of the resistor R300. The other end of the resistor R300 is connected to one end of the capacitor CE301. The other end of the capacitor CE301 is connected to the output terminal of the transformer T100_C.

[0021] Further, the feedback loop includes: field effect transistor Q101, resistor RS101, resistor R109, resistor R110, resistor R111, resistor R112, resistor R113, resistor R115, resistor R116, diode D101, diode D102, diode D103, capacitor CE101, capacitor C105, capacitor C106, capacitor C107, transformer T100_B, and chip U101;

[0022] Among them, the second pin of chip U101 is respectively connected to one end of resistor R111, one end of resistor R112, and one end of capacitor C108. The other end of resistor R111 is respectively connected to one end of resistor R110 and the cathode of diode D101. The other end of resistor R110 is respectively connected to the anode of diode D102 and one end of transformer T100_B. The other end of transformer T100_B is respectively connected to the anode of diode D101, the other end of resistor R112, the other end of capacitor C108, the other end of capacitor CE101, the other end of capacitor C105, one end of capacitor C106, one end of capacitor C107, one end of resistor RS101, and one end of capacitor CY101. The third pin of chip U101 is connected to the other end of capacitor C106. The fourth pin of chip U101 is respectively connected to one end of resistor R116 and the other end of capacitor C107. The other end of resistor R116 is respectively connected to one end of resistor R115, resistor RS101, and the source of field effect transistor Q101. The sixth pin of chip U101 is respectively connected to the cathode of diode D303 and one end of resistor R109. The anode of diode D303 is respectively connected to the other end of resistor R109, one end of resistor R115, and the gate of field effect transistor Q101.

[0023] Further, the BUCK constant current dimming and color mixing circuit includes: resistor RI301, resistor RI302, resistor R301, resistor R302, resistor R303, resistor R304, resistor R307, resistor R308, resistor R309, resistor R310, capacitor C301, capacitor C302, capacitor C307, capacitor C308, capacitor CE302, capacitor CE303, field effect transistor Q301, field effect transistor Q302, diode D301, diode D302, diode D304, diode D305, inductor L301_A, inductor L302_A, chip U301, chip U302, and terminal block TB301;

[0024] Among them, the first pin of the terminal block TB301 is respectively connected to one end of the resistor R309, one end of the resistor RI302, one end of the capacitor CE303, and the first pin of the chip U302. The other end of the resistor R309 is respectively connected to one end of the resistor R310 and one end of the capacitor C308. The other end of the resistor R310 is respectively connected to the other end of the capacitor C308, the fourth pin of the chip U302, one end of the resistor R304, and the source electrode of the field effect transistor Q302. The other end of the resistor R304 is respectively connected to the gate of the field effect transistor Q302, one end of the resistor R303, and the anode of the diode D305. The other end of the resistor R303 is respectively connected to the cathode of the diode D305 and the fifth pin of the chip U302. The other end of the resistor RI302 is respectively connected to one end of the inductor L302_A and the second pin of the chip U302. The other end of the inductor L302_A is respectively connected to the drain of the field effect transistor Q302 and the anode of the diode D302. The cathode of the diode D302 is respectively connected to the other end of the capacitor CE303, one end of the capacitor CE302, the cathode of the diode D301, and the second pin of the terminal block TB301;

[0025] The third pin of the terminal block TB301 is respectively connected to one end of the resistor R307, one end of the resistor RI301, one end of the capacitor CE302, and the first pin of the chip U301. The other end of the resistor R307 is respectively connected to one end of the resistor R308 and one end of the capacitor C307. The other end of the resistor R308 is respectively connected to the other end of the capacitor C307, the fourth pin of the chip U301, one end of the resistor R302, and the source electrode of the field effect transistor Q301. The other end of the resistor R302 is respectively connected to the gate of the field effect transistor Q301, one end of the resistor R301, and the anode of the diode D304. The other end of the resistor R301 is respectively connected to the cathode of the diode D304 and the fifth pin of the chip U301. The other end of the resistor RI301 is respectively connected to one end of the inductor L301_A and the second pin of the chip U301. The other end of the inductor L301_A is respectively connected to the drain of the field effect transistor Q301 and the anode of the diode D301.

[0026] Furthermore, the DALI control module includes: a switch SW301, a resistor RS301, a resistor RS302, a resistor RS303, and a connector CN301;

[0027] Among them, the first pin of the connector CN301 is respectively connected to the fourth, fifth, and sixth pins of the switch SW301. The seventh pin of the connector CN301 is respectively connected to one end of the resistor RS301, the resistor RS302, and the resistor RS303. The other end of the resistor RS301 is connected to the first pin of the switch SW301. The resistor RS302 is connected to the second pin of the switch SW301. The other end of the resistor RS303 is connected to the third pin of the switch SW301.

[0028] The beneficial effects of the present utility model are as follows: The DALI control main control emits signals with specific frequencies and wavelengths, which are decoded by the DALI control module and output dimming signals to the power supply. When multiple power supplies are connected in parallel, separate control addresses are provided for each power supply, enabling individual control of each lamp. The minimum brightness is not greater than 0.01%. Adjusting the output current through the DIP switch allows the LED driver to be applicable to more LEDs. The optimized driver can maintain a current regulation rate of ±3% under an ultra-wide load voltage. The optimized BUCK circuit has excellent regulation rate under a load of 3 - 45V output. Also, the DIP switch can adjust the output current, greatly increasing the compatibility of the LED lamp. The DALI digital dimming has strong anti-interference ability, with a minimum current of 0.01%. The innovative use of the analog + PWM variable frequency pulse width dimming method can effectively solve the existing problems of dimming flicker and smooth dimming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 is a schematic block diagram of a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0031] Figure 2 is a schematic circuit diagram of a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0032] Figure 3 is a schematic circuit diagram of an EMC filter circuit in a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0033] Figure 4 is a schematic circuit diagram of a power factor correction circuit in a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0034] Figure 5 is a schematic circuit diagram of a flyback circuit in a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0035] Figure 6 is a schematic circuit diagram of a DC constant voltage circuit in a flicker-free and DIP-switch selectable current LED color temperature dimming power supply according to an embodiment of the present utility model;

[0036] Figure 7It is the circuit schematic diagram of the feedback loop in a flicker-free and digitally-codable current-selectable LED color-tuning and dimming power supply according to an embodiment of the present invention;

[0037] Figure 8 It is the circuit schematic diagram of the BUCK constant-current color-tuning and dimming circuit in a flicker-free and digitally-codable current-selectable LED color-tuning and dimming power supply according to an embodiment of the present invention;

[0038] Figure 9 It is the circuit schematic diagram of the DALI control module in a flicker-free and digitally-codable current-selectable LED color-tuning and dimming power supply according to an embodiment of the present invention.

[0039] In the figure:

[0040] 1. EMC filtering circuit; 2. Rectifier bridge circuit; 3. Power factor correction circuit; 4. Flyback circuit; 5. Isolation transformer; 6. DC constant-voltage circuit; 7. Feedback loop; 8. BUCK constant-current color-tuning and dimming circuit; 9. DALI control module; 10. DIP switch control; 11. Dimming pin control; 12. Current and voltage signal; 13. DALI digital signal; 14. LED lighting device. Detailed implementation manners

[0041] According to an embodiment of the present invention, a flicker-free and digitally-codable current-selectable LED color-tuning and dimming power supply is provided.

[0042] Now, the present invention will be further described in conjunction with the accompanying drawings and specific implementation manners. As Figures 1-9 shown, the flicker-free and digitally-codable current-selectable LED color-tuning and dimming power supply according to an embodiment of the present invention includes: an EMC filtering circuit 1, a rectifier bridge circuit 2, a power factor correction circuit 3, a flyback circuit 4, an isolation transformer 5, a DC constant-voltage circuit 6, a feedback loop 7, a BUCK constant-current color-tuning and dimming circuit 8, a DALI control module 9, a DIP switch control 10, a dimming pin control 11, a current and voltage signal 12, a DALI digital signal 13, and an LED lighting device 14;

[0043] Among them, the input end of the EMC filter circuit 1 is connected to the mains power supply. The EMC filter circuit 1, the rectifier bridge circuit 2, the power factor correction circuit 3, the flyback circuit 4, the isolation transformer 5, the DC constant voltage circuit 6, the feedback loop 7, the BUCK constant current dimming and color temperature adjustment circuit 8, and the LED lighting device are connected in sequence. Another output end of the DC constant voltage circuit is connected to the feedback loop 7, and the output end of the feedback loop 7 is connected to the feedback input end of the flyback circuit 4. The DALI control module 9 is connected to the DALI digital signal 13. The output end of the BUCK constant current dimming and color temperature adjustment circuit 8 is connected to the DALI control module 9 through the current-voltage signal 12. The output end of the DALI control module 9 is connected to the BUCK constant current dimming and color temperature adjustment circuit 8 through the DIP switch control 10 and the dimming pin control 11.

[0044] In one embodiment, the EMC filter circuit 1 includes: a fuse F101, a varistor RV101, an inductor LF101, an inductor LF102, a safety capacitor CX101, and a terminal block TB101; the rectifier bridge circuit 2 includes a rectifier bridge BD101.

[0045] Among them, the 4th pin of the terminal block TB101 is respectively connected to one end of the varistor RV101 and the input end of the inductor LF101. The 5th pin of the terminal block TB101 is respectively connected to one end of the fuse F101. The other end of the fuse F101 is connected to one end of the varistor RV101 and the other input end of the inductor LF101. The output end of the inductor LF101 is respectively connected to one end of the safety capacitor CX101 and the input end of the inductor LF102. The other output end of the inductor LF101 is respectively connected to the other end of the safety capacitor CX101 and the other input end of the inductor LF102. Both output ends of the inductor LF102 are connected to the rectifier bridge BD101.

[0046] In one embodiment, the power factor correction circuit 3 includes: capacitors C101, C102, resistors R100, R101, R102, R103, R117, R118, a field effect transistor Q102, a diode D100, a capacitor CE100, and an inductor L101.

[0047] Among them, the output terminals of the rectifier bridge BD101 are respectively connected to one end of the capacitor C101 and one end of the inductor L101. The other output terminal of the rectifier bridge BD101 is respectively connected to the other end of the capacitor C101, one end of the capacitor C102, and one end of the capacitor CE100. The other end of the inductor L101 is respectively connected to the other end of the capacitor C102, the anode of the diode, one end of the resistor R118, one end of the resistor R100, one end of the resistor R103, one end of the resistor R105, one end of the capacitor C103, and the input terminal of the transformer T100_A. The other end of the capacitor CE100 is respectively connected to the cathode of the diode D10 and one end of the resistor R117. The other end of the resistor R118 is connected to the other end of the resistor R117. The other end of the resistor R100 is connected to one end of the resistor R101. The other end of the resistor R103 is connected to one end of the resistor R102. The other end of the resistor R102 is connected to the drain of the field effect transistor Q102. The gate of the field effect transistor Q102 is connected to the other end of the resistor R101. The source of the field effect transistor Q102 is respectively connected to one end of the resistor R113, one end of the capacitor CE101, one end of the capacitor C105, and the first pin of the chip U101.

[0048] In one embodiment, the flyback circuit 4 includes: a resistor R105, a resistor R106, a resistor R107, a capacitor C103, and a diode D104;

[0049] Among them, one end of the resistor R105 and one end of the capacitor C103 are both connected to the input terminal of the transformer T100_A. The other end of the resistor R105 is connected to one end of the resistor R106. The other end of the capacitor C103 is respectively connected to the other end of the resistor R106 and one end of the resistor R107. The other end of the resistor R107 is connected to the cathode of the diode D104. The anode of the diode D104 is respectively connected to the input terminal of the transformer T100_A and the drain of the field effect Q101.

[0050] In one embodiment, the DC constant voltage circuit 6 includes a diode D201, a diode D303, a capacitor CE201, a capacitor CE301, a resistor R202, and a resistor R300;

[0051] Among them, the anode of the diode D201 is connected to the output terminal of the transformer T100_A. The cathode of the diode D201 is respectively connected to one end of the capacitor CE201 and one end of the resistor R202. The other end of the capacitor CE201 is connected to the other end of the resistor R202;

[0052] The anode of the diode D303 is connected to the output terminal of the transformer T100_A. The cathode of the diode D303 is connected to one end of the resistor R300. The other end of the resistor R300 is connected to one end of the capacitor CE301. The other end of the capacitor CE301 is connected to the output terminal of the transformer T100_C.

[0053] In one embodiment, the feedback loop 7 includes: field effect transistor Q101, resistor RS101, resistor R109, resistor R110, resistor R111, resistor R112, resistor R113, resistor R115, resistor R116, diode D101, diode D102, diode D103, capacitor CE101, capacitor C105, capacitor C106, capacitor C107, transformer T100_B, and chip U101;

[0054] Among them, the second pin of chip U101 is respectively connected to one end of resistor R111, one end of resistor R112, and one end of capacitor C108. The other end of resistor R111 is respectively connected to one end of resistor R110 and the cathode of diode D101. The other end of resistor R110 is respectively connected to the anode of diode D102 and one end of transformer T100_B. The other end of transformer T100_B is respectively connected to the anode of diode D101, the other end of resistor R112, the other end of capacitor C108, the other end of capacitor CE101, the other end of capacitor C105, one end of capacitor C106, one end of capacitor C107, one end of resistor RS101, and one end of capacitor CY101. The third pin of chip U101 is connected to the other end of capacitor C106. The fourth pin of chip U101 is respectively connected to one end of resistor R116 and the other end of capacitor C107. The other end of resistor R116 is respectively connected to one end of resistor R115, resistor RS101, and the source of field effect transistor Q101. The sixth pin of chip U101 is respectively connected to the cathode of diode D303 and one end of resistor R109. The anode of diode D303 is respectively connected to the other end of resistor R109, one end of resistor R115, and the gate of field effect transistor Q101.

[0055] In one embodiment, the BUCK constant current dimming and color mixing circuit 8 includes: resistor RI301, resistor RI302, resistor R301, resistor R302, resistor R303, resistor R304, resistor R307, resistor R308, resistor R309, resistor R310, capacitor C301, capacitor C302, capacitor C307, capacitor C308, capacitor CE302, capacitor CE303, field effect transistors Q301 and Q302, diodes D301, D302, D304, and D305, inductors L301_A and L302_A, chips U301 and U302, and terminal block TB301;

[0056] Among them, the first pin of the terminal block TB301 is respectively connected to one end of the resistor R309, one end of the resistor RI302, one end of the capacitor CE303, and the first pin of the chip U302. The other end of the resistor R309 is respectively connected to one end of the resistor R310 and one end of the capacitor C308. The other end of the resistor R310 is respectively connected to the other end of the capacitor C308, the fourth pin of the chip U302, one end of the resistor R304, and the source electrode of the field effect transistor Q302. The other end of the resistor R304 is respectively connected to the gate of the field effect transistor Q302, one end of the resistor R303, and the anode of the diode D305. The other end of the resistor R303 is respectively connected to the cathode of the diode D305 and the fifth pin of the chip U302. The other end of the resistor RI302 is respectively connected to one end of the inductor L302_A and the second pin of the chip U302. The other end of the inductor L302_A is respectively connected to the drain of the field effect transistor Q302 and the anode of the diode D302. The cathode of the diode D302 is respectively connected to the other end of the capacitor CE303, one end of the capacitor CE302, the cathode of the diode D301, and the second pin of the terminal block TB301;

[0057] The third pin of the terminal block TB301 is respectively connected to one end of the resistor R307, one end of the resistor RI301, one end of the capacitor CE302, and the first pin of the chip U301. The other end of the resistor R307 is respectively connected to one end of the resistor R308 and one end of the capacitor C307. The other end of the resistor R308 is respectively connected to the other end of the capacitor C307, the fourth pin of the chip U301, one end of the resistor R302, and the source electrode of the field effect transistor Q301. The other end of the resistor R302 is respectively connected to the gate of the field effect transistor Q301, one end of the resistor R301, and the anode of the diode D304. The other end of the resistor R301 is respectively connected to the cathode of the diode D304 and the fifth pin of the chip U301. The other end of the resistor RI301 is respectively connected to one end of the inductor L301_A and the second pin of the chip U301. The other end of the inductor L301_A is respectively connected to the drain of the field effect transistor Q301 and the anode of the diode D301.

[0058] In one embodiment, the DALI control module 9 includes: a switch SW301, a resistor RS301, a resistor RS302, a resistor RS303, and a connector CN301;

[0059] Among them, the first pin of the connector CN301 is respectively connected to the fourth, fifth, and sixth pins of the switch SW301. The seventh pin of the connector CN301 is respectively connected to one end of the resistor RS301, the resistor RS302, and the resistor RS303. The other end of the resistor RS301 is connected to the first pin of the switch SW301. The resistor RS302 is connected to the second pin of the switch SW301. The other end of the resistor RS303 is connected to the third pin of the switch SW301.

[0060] To facilitate the understanding of the above technical solution of the present utility model, the working principle or operation mode of the present utility model in the actual process will be described in detail below.

[0061] In actual application, the input end of the EMC filter circuit 1 is connected to the mains power supply, and the rectifier bridge circuit 2 is connected to the output end of the EMC filter circuit 1. The rectifier bridge circuit 2 is used to convert the input AC mains power into high-voltage direct current. The power factor correction circuit 3 and the output end of the flyback circuit 4 are connected to the primary of the isolation transformer 5. The power factor correction flyback isolation circuit (the power factor correction circuit 3 and the flyback circuit 4 form a whole) is used to generate a 65KHz PWM switching signal for controlling the on and off of the MOS (field effect transistor) in the isolation transformer 5. The power factor of the mains power supply is corrected by detecting the current on the MOS and the input voltage, and at the same time, the high-voltage direct current is chopped and coupled and transmitted to the secondary through the isolation transformer 5 to provide a stable DC constant voltage power supply for the BUCK constant current dimming and color mixing circuit 8 on the secondary. The low-voltage side of the isolation transformer 5 is connected to the input end of the DC constant voltage power supply and converted into a stable low-voltage DC through capacitor filtering. One output end of the DC constant voltage circuit 6 is connected to the input end of the BUCK constant current dimming and color mixing circuit 8, and the other output end of the DC constant voltage power supply 6 is connected to the feedback input end of the flyback circuit 4 through an isolated feedback loop 7. The output end of the BUCK constant current dimming and color mixing circuit 8 is connected to the power input end of the LED lighting device 14. The other output ends of the BUCK constant current dimming and color mixing circuit 8 are respectively connected to the DIP switch control 10, the DALI control module dimming pin control 11, and the current and voltage signal 12. The DALI control module 9 is connected to the DALI digital signal 13 of the DALI master control.

[0062] When the 220Vac mains power is turned on, the EMC filter circuit 1, rectifier bridge circuit 2, power factor correction circuit 3, flyback circuit 4, and isolation transformer 5 output a constant voltage of 50VDC to power the "BUCK constant current dimming and color temperature adjustment circuit 8" (at this time, the voltage dividers of resistor R110, resistor R111, and resistor R112 detect the magnitude of the 50V voltage to control the voltage to always remain at 50VDC). At this time, the BUCK constant current dimming and color temperature adjustment circuit 8 starts to work, outputting a constant current to the LED lamp with an output voltage of 3 - 45V. The DIP switch SW301 changes the voltage at pin 1 by selecting resistors. The DALI module detects this voltage at pin 1 and controls the PWM signals output from pins 4 and 5 to U301 and U302 respectively to achieve changing the output current by DIP switch selection. The DALI control module 9 detects the voltage signals of two LED lamps through R307, R308, R309, and R310 respectively to determine whether the output lamps are damaged, and makes load adjustment compensation based on this voltage to make the current consistent within the entire output voltage range. The DALI master sends the digital signal 13 of DALI to pins 8, 9, and 10 of the connector CN301 inside the DALI control module 9. After being processed by the single-chip microcomputer, a mixed signal of PWM and DC voltage is output to control the voltage at pin 3 of the BUCK constant current chips U301 and U302, thereby controlling the magnitude of the output current of the two channels to precisely change the brightness of the LED lamp, and adjusting the color temperature of the LED lamp by changing the ratio of the currents of two different color temperature LEDs.

[0063] In summary, by means of the above technical solutions of the present invention, a signal with a specific frequency and wavelength is sent by the DALI control master, decoded by the DALI control module and output as a dimming signal to the power supply, and a separate control address is provided for each power supply under the parallel connection of multiple power supplies, enabling each lamp to be controlled separately, and the minimum brightness is not greater than 0.01%. Adjusting the output current through the DIP switch can make the LED driver applicable to more LEDs. The optimized driver can maintain a current regulation rate of ±3% under an ultra-wide load voltage. The optimized BUCK circuit has excellent regulation rate under the load condition of outputting 3 - 45V. Also, the DIP switch can adjust the output current, greatly increasing the compatibility of the LED lamp; the DALI digital dimming has strong anti-interference ability, with a minimum current of 0.01%. The innovative adoption of the analog + PWM variable frequency pulse width dimming method can effectively solve the existing problems of dimming flicker and smooth dimming process.

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flicker-free, dial-code-selectable current LED dimming power supply, characterized in that: The dimming power supply comprises: an EMC filter circuit (1), a rectifier bridge circuit (2), a power factor correction circuit (3), a flyback circuit (4), an isolation transformer (5), a DC constant voltage circuit (6), a feedback loop (7), a BUCK constant current dimming circuit (8), a DALI control module (9), a DIP switch control (10), a dimming foot control (11), a current and voltage signal (12), a DALI digital signal (13) and an LED lighting device (14); The input end of the EMC filter circuit (1) is connected to the mains, the EMC filter circuit (1), the rectifier bridge circuit (2), the power factor correction circuit (3), the flyback circuit (4), the isolation transformer (5), the DC constant voltage circuit (6), the feedback loop (7), the BUCK constant current dimming circuit (8) and the LED lighting device are connected in sequence, the other output end of the DC constant voltage circuit is connected to the feedback loop (7), and the output end of the feedback loop (7) is connected to the feedback input end of the flyback circuit (4), the DALI control module (9) is connected to the DALI digital signal (13), the output end of the BUCK constant current dimming circuit (8) is connected to the DALI control module (9) through the current and voltage signal (12), and the output end of the DALI control module (9) is connected to the BUCK constant current dimming circuit (8) through the dip switch control (10) and the dimming foot control (11).

2. According to claim 1, a flicker-free, dialable, current-selectable, LED dimming power supply, characterized in that: The EMC filter circuit (1) comprises: a fuse F101, a varistor RV101, an inductor LF101, an inductor LF102, a safety capacitor CX101 and a terminal block TB101; the rectifier bridge circuit (2) comprises a rectifier bridge BD101; Among them, the 4th pin of the terminal block TB101 is respectively connected to one end of the varistor RV101 and the input end of the inductor LF101, the 5th pin of the terminal block TB101 is respectively connected to one end of the fuse F101, the other end of the fuse F101 is connected to one end of the varistor RV101 and the other input end of the inductor LF101, the output end of the inductor LF101 is respectively connected to one end of the safety capacitor CX101 and the input end of the inductor LF102, the other output end of the inductor LF101 is respectively connected to the other end of the safety capacitor CX101 and the other input end of the inductor LF102, and the two output ends of the inductor LF102 are both connected to the rectifier bridge BD101.

3. A flicker-free, dialable, current-selectable, LED dimming power supply according to claim 2, characterized in that: The power factor correction circuit (3) comprises: a capacitor C101, a capacitor C102, a resistor R100, a resistor R101, a resistor R102, a resistor R103, a resistor R117, a resistor R118, a field effect transistor Q102, a diode D100, a capacitor CE100 and an inductor L101; The output end of the rectifier bridge BD101 is respectively connected to one end of the capacitor C101 and one end of the inductor L101, the other output end of the rectifier bridge BD101 is respectively connected to the other end of the capacitor C101, one end of the capacitor C102 and one end of the capacitor CE100, the other end of the inductor L101 is respectively connected to the other end of the capacitor C102, the anode of the diode, one end of the resistor R118, one end of the resistor R100, one end of the resistor R103, one end of the resistor R105, one end of the capacitor C103 and the input end of the transformer T100_A, the other end of the capacitor CE100 is respectively connected to the other end of the capacitor C101, one end of the capacitor C102 and one end of the capacitor CE100. The first and second ends of the resistor R100 and the second end of the resistor R101 are connected to the cathode of the diode D10 and one end of the resistor R117 respectively. The other end of the resistor R118 is connected to the other end of the resistor R117. The other end of the resistor R100 is connected to one end of the resistor R101. The other end of the resistor R103 is connected to one end of the resistor R102. The other end of the resistor R102 is connected to the drain of the field effect transistor Q102. The gate of the field effect transistor Q102 is connected to the other end of the resistor R101. The source of the field effect transistor Q102 is respectively connected to one end of the resistor R113, one end of the capacitor CE101, one end of the capacitor C105 and the first pin of the chip U101.

4. A flicker-free, dialable, current-selectable, LED dimming power supply according to claim 3, characterized in that: The flyback circuit (4) comprises: a resistor R105, a resistor R106, a resistor R107, a capacitor C103 and a diode D104; Among them, one end of the resistor R105 and one end of the capacitor C103 are both connected to the input end of the transformer T100_A, the other end of the resistor R105 is connected to one end of the resistor R106, the other end of the capacitor C103 is respectively connected to the other end of the resistor R106 and one end of the resistor R107, the other end of the resistor R107 is connected to the cathode of the diode D104, and the anode of the diode D104 is respectively connected to the input end of the transformer T100_A and the drain of the field effect Q101.

5. A flicker-free, dialable, current-selectable, LED dimming power supply according to claim 4, characterized in that: The DC constant voltage circuit (6) comprises a diode D201, a diode D303, a capacitor CE201, a capacitor CE301, a resistor R202 and a resistor R300; The anode of the diode D201 is connected to the output end of the transformer T100_A, the cathode of the diode D201 is connected to one end of the capacitor CE201 and one end of the resistor R202 respectively, and the other end of the capacitor CE201 is connected to the other end of the resistor R202; The anode of the diode D303 is connected to the output end of the transformer T100_A, the cathode of the diode D303 is connected to one end of the resistor R300, the other end of the resistor R300 is connected to one end of the capacitor CE301, and the other end of the capacitor CE301 is connected to the output end of the transformer T100_C.

6. A flicker-free, dialable, current-selectable, LED dimming power supply according to claim 5, characterized in that: The feedback loop (7) includes: a field effect transistor Q101, a resistor RS101, a resistor R109, a resistor R110, a resistor R111, a resistor R112, a resistor R113, a resistor R115, a resistor R116, a diode D101, a diode D102, a diode D103, a capacitor CE101, a capacitor C105, a capacitor C106, a capacitor C107, a transformer T100_B, and a chip U101; Among them, the second pin of the chip U101 is respectively connected to one end of the resistor R111, one end of the resistor R112, and one end of the capacitor C108, the other end of the resistor R111 is respectively connected to one end of the resistor R110 and the cathode of the diode D101, the other end of the resistor R110 is respectively connected to the anode of the diode D102 and one end of the transformer T100_B, the other end of the transformer T100_B is respectively connected to the anode of the diode D101, the other end of the resistor R112, the other end of the capacitor C108, the other end of the capacitor CE101, the other end of the capacitor C105, one end of the capacitor C106, one end of the capacitor C107, One end of the resistor RS101 is connected to one end of the capacitor CY101, the third pin of the chip U101 is connected to the other end of the capacitor C106, the fourth pin of the chip U101 is respectively connected to one end of the resistor R116 and the other end of the capacitor C107, the other end of the resistor R116 is respectively connected to one end of the resistor R115, the resistor RS101 and the source of the field effect transistor Q101, the sixth pin of the chip U101 is respectively connected to the cathode of the diode D103 and one end of the resistor R109, and the anode of the diode D103 is respectively connected to the other end of the resistor R109, one end of the resistor R115 and the gate of the field effect transistor Q101.

7. A flicker-free, dialable, current-selectable, LED dimming power supply according to claim 6, characterized in that: The BUCK constant current dimming circuit (8) comprises: a resistor RI301, a resistor RI302, a resistor R301, a resistor R302, a resistor R303, a resistor R304, a resistor R307, a resistor R308, a resistor R309, a resistor R310, a capacitor C301, a capacitor C302, a capacitor C307, a capacitor C308, a capacitor CE302, a capacitor CE303, a field effect transistor Q301, a field effect transistor Q302, a diode D301, a diode D302, a diode D304, a diode D305, an inductor L301_A, an inductor L302_A, a chip U301, a chip U302 and a terminal block TB301; The first pin of the terminal block TB301 is respectively connected to one end of the resistor R309, one end of the resistor RI302, one end of the capacitor CE303 and the first pin of the chip U302, the other end of the resistor R309 is respectively connected to one end of the resistor R310 and one end of the capacitor C308, the other end of the resistor R310 is respectively connected to the other end of the capacitor C308, the fourth pin of the chip U302, one end of the resistor R304 and the source of the field effect transistor Q302, the other end of the resistor R304 is respectively connected to the gate of the field effect transistor Q302, the first end of the resistor R303 and the second end of the resistor R304. The first end of the first diode D301 is connected to the anode of the diode D305, the other end of the resistor R303 is connected to the cathode of the diode D305 and the 5th pin of the chip U302, the other end of the resistor RI302 is connected to one end of the inductor L302_A and the 2nd pin of the chip U302, the other end of the inductor L302_A is connected to the drain of the field effect transistor Q302 and the anode of the diode D302, the cathode of the diode D302 is connected to the other end of the capacitor CE303, one end of the capacitor CE302, the cathode of the diode D301 and the 2nd pin of the terminal block TB301; The third pin of the terminal block TB301 is respectively connected to one end of the resistor R307, one end of the resistor RI301, one end of the capacitor CE302 and the first pin of the chip U301. The other end of the resistor R307 is respectively connected to one end of the resistor R308 and one end of the capacitor C307. The other end of the resistor R308 is respectively connected to the other end of the capacitor C307, the fourth pin of the chip U301, one end of the resistor R302 and the source of the field effect transistor Q301. The other end of the resistor R302 is respectively connected to the gate of the field effect transistor Q301, one end of the resistor R301 and the anode of the diode D304, the other end of the resistor R301 is respectively connected to the cathode of the diode D304 and the 5th pin of the chip U301, the other end of the resistor RI301 is respectively connected to one end of the inductor L301_A and the 2nd pin of the chip U301, and the other end of the inductor L301_A is respectively connected to the drain of the field effect transistor Q301 and the anode of the diode D301.

8. The flicker-free, dialable, current-selectable, LED dimming power supply according to claim 7, characterized in that: The DALI control module (9) comprises: a switch SW301, a resistor RS301, a resistor RS302, a resistor RS303 and a connector CN301; Among them, the first pin of the connector CN301 is connected to the fourth, fifth and sixth pins of the switch SW301 respectively, the seventh pin of the connector CN301 is connected to one end of the resistor RS301, the resistor RS302 and the resistor RS303 respectively, the other end of the resistor RS301 is connected to the first pin of the switch SW301, the resistor RS302 is connected to the second pin of the switch SW301, and the other end of the resistor RS303 is connected to the third pin of the switch SW301.

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