Depth dimming LED power supply

Abstract

The utility model discloses an LED power supply, belongs to the technical field of LED power supplies, and particularly relates to a deep dimming LED power supply which comprises a Buck voltage reduction constant current circuit, a dimming interface and an LED module. A single chip microcomputer is arranged between the Buck voltage reduction constant current circuit and the dimming interface; the single-chip microcomputer expands 5% of the dimming depth to 1% of the dimming depth, and the single-chip microcomputer is connected with a power supply circuit and a zero cross detection circuit; the single-chip microcomputer serves as a controller of an LED power supply, detects an input power supply signal through the zero-cross detection circuit so as to judge the current control color, and controls the brightness of the lamp through a PWM signal. The power supply circuit increases working voltage for the single-chip microcomputer. According to the utility model, the single-chip microcomputer is adopted for control, a 1-10V deep dimming function can be realized, and 1% dimming depth can be realized, so that the dimming range can be greatly expanded, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model discloses an LED power supply, belongs to the technical field of LED power supplies, and specifically relates to a deep dimming LED power supply. Background Art

[0002] The arrival of LED has driven the development of dimming technology, and when we enter the era of intelligent lighting, the importance of LED dimming technology in the field of lighting control will continue to increase. At present, the application functions of dimming power supply are divided into two categories; on the one hand, facing the background of energy crisis, people need to distinguish the lamps used according to different usage scenarios to avoid the waste of lighting electricity, such as underground garages, large warehouses and factories, road lighting, etc., increase / reduce the lighting brightness based on factors such as the number of users or time periods to achieve energy-saving effects; on the other hand, with the upgrading of residents' consumption experience needs, immersive and intelligent lighting needs to use dimming to set off the atmosphere of high-end restaurants, banquet halls, hotel rooms, clubs and other environments, and create immersive lighting scenes.

[0003] However, the existing LED dimming technology 1-10V dimming is widely used, and the dimming depth is usually 10%. However, customers with high requirements require a lower depth, 5%, or even 1%. The existing 1-10V interface chip can only provide a 5% depth. For example, KP1402 can only reach 7%, which makes it impossible to achieve a deeper dimming. Utility Model Content

[0004] Purpose of the utility model: to provide a deep dimming LED power supply to solve the above-mentioned problems.

[0005] Technical solution: A deep dimming LED power supply, comprising: a Buck step-down constant current circuit, a dimming interface and an LED module; a single-chip microcomputer is arranged between the Buck step-down constant current circuit and the dimming interface;

[0006] The single-chip microcomputer expands the dimming depth of 5% to 1% dimming depth. The single-chip microcomputer is connected to a power supply circuit and a zero-crossing detection circuit. The single-chip microcomputer serves as a controller of an LED power supply. The single-chip microcomputer detects an input power supply signal through a zero-crossing detection circuit to determine the current control color and uses a PWM signal to control the brightness of the lamp. The power supply circuit increases the operating voltage of the single-chip microcomputer.

[0007] In a further embodiment, the zero-crossing detection circuit is divided into four paths, corresponding to red light, green light, blue light and dimming end respectively.

[0008] In a further embodiment, the power supply circuit is composed of a step-down power supply module, a varistor, a fuse, a voltage stabilizing chip and a filter capacitor; the voltage is converted from AC to DC through the step-down power supply module, and the voltage is stabilized at the required working voltage through the filter capacitor and the voltage stabilizing chip; the fuse serves as short-circuit protection; and the varistor serves as overvoltage protection.

[0009] In a further embodiment, the Buck step-down constant current circuit has a built-in Buck control chip.

[0010] In a further embodiment, the input end of the Buck step-down constant current circuit is connected to the power supply, the output end is connected to the LED module, the dimming interface is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the Buck step-down constant current circuit.

[0011] In a further embodiment, the dimming interface consists of a 1-10V dimming interface and a 0-10V dimming interface, and the dimming interface is built with a 5%-10% low dimming depth interface chip.

[0012] In a further embodiment, the zero-crossing detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a diode D1, a fuse FU1, a varistor VR1, a capacitor C1, a capacitor C2 and an optocoupler U1;

[0013] The positive electrode of the diode D1 is connected to one end of the fuse FU1, and the other end of the fuse FU1 is simultaneously connected to the varistor VR1, one end of the capacitor C1 and one end of the resistor R1, pin 1 of the optocoupler U1 is connected to one end of the resistor R1, one end of the resistor R2 is simultaneously connected to the other end of the varistor VR1 and one end of the capacitor C1, pin 2 of the optocoupler U1 is connected to the other end of the resistor R2, pin 4 of the optocoupler U1 is simultaneously connected to one end of the resistor R3 and one end of the capacitor C2 and outputs a signal to the microcontroller, pin 3 of the optocoupler U1 is connected to the other end of the capacitor C2 and is grounded, and the other end of the resistor R3 inputs a voltage.

[0014] Beneficial effects: The utility model discloses an LED power supply, belongs to the technical field of LED power supplies, and specifically relates to a deep dimming LED power supply including: a Buck step-down constant current circuit, a dimming interface and an LED module; a single-chip microcomputer is arranged between the Buck step-down constant current circuit and the dimming interface; the single-chip microcomputer expands the 5% dimming depth to 1% dimming depth, and the single-chip microcomputer is connected to a power supply circuit and a zero-crossing detection circuit; the single-chip microcomputer serves as a controller of the LED power supply, detects the input power supply signal through the zero-crossing detection circuit, thereby judging the current control color, and uses a PWM signal to control the brightness of the lamp; the power supply circuit increases the working voltage of the single-chip microcomputer; the utility model adopts single-chip microcomputer control, can realize the deep dimming 1-10V function, can realize 1% dimming depth, thereby greatly improving the dimming range, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a deep dimming LED power supply in the prior art.

[0016] Figure 2 It is a schematic diagram of the deep dimming LED power supply of the utility model.

[0017] Figure 3 It is a schematic diagram of a single chip microcomputer of the utility model.

[0018] Figure 4 It is a schematic diagram of a zero-crossing detection circuit of the utility model. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] A deep dimming LED power supply, such as Figure 2 As shown, it includes: a Buck step-down constant current circuit, a dimming interface and an LED module; a single chip microcomputer is arranged between the Buck step-down constant current circuit and the dimming interface;

[0023] In one embodiment, Figure 3 As shown, the single-chip microcomputer expands the dimming depth of 5% to 1% dimming depth, and the single-chip microcomputer is connected to a power supply circuit and a zero-crossing detection circuit; the single-chip microcomputer serves as a controller of the LED power supply, detects the input power supply signal through the zero-crossing detection circuit, thereby determining the current control color, and uses a PWM signal to control the brightness of the lamp; the power supply circuit increases the working voltage of the single-chip microcomputer.

[0024] In one embodiment, Figure 3 As shown, the zero-crossing detection circuit is divided into 4 paths, corresponding to the red light, green light, blue light and dimming end respectively.

[0025] In one embodiment, the power supply circuit is composed of a step-down power supply module, a varistor, a fuse, a voltage stabilizing chip and a filter capacitor; the voltage is converted from AC to DC through the step-down power supply module, and the voltage is stabilized at the required working voltage through the filter capacitor and the voltage stabilizing chip; the fuse plays a short-circuit protection role; the varistor plays an overvoltage protection role.

[0026] In one embodiment, Figure 2 As shown, the Buck step-down constant current circuit has a built-in Buck control chip.

[0027] In one embodiment, Figure 2 As shown, the input end of the Buck step-down constant current circuit is connected to the power supply, the output end is connected to the LED module, the dimming interface is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the Buck step-down constant current circuit.

[0028] In one embodiment, Figure 2As shown, the dimming interface consists of a 1-10V dimming interface and a 0-10V dimming interface, and the dimming interface is built with a 5%-10% low dimming depth interface chip.

[0029] In one embodiment, Figure 4 As shown, the zero-crossing detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a diode D1, a fuse FU1, a varistor VR1, a capacitor C1, a capacitor C2 and an optocoupler U1;

[0030] The positive electrode of the diode D1 is connected to one end of the fuse FU1, and the other end of the fuse FU1 is simultaneously connected to the varistor VR1, one end of the capacitor C1 and one end of the resistor R1, pin 1 of the optocoupler U1 is connected to one end of the resistor R1, one end of the resistor R2 is simultaneously connected to the other end of the varistor VR1 and one end of the capacitor C1, pin 2 of the optocoupler U1 is connected to the other end of the resistor R2, pin 4 of the optocoupler U1 is simultaneously connected to one end of the resistor R3 and one end of the capacitor C2 and outputs a signal to the microcontroller, pin 3 of the optocoupler U1 is connected to the other end of the capacitor C2 and is grounded, and the other end of the resistor R3 inputs a voltage.

[0031] Working principle: When the utility model is working, different dimming depths are selected according to the dimming interface, and then the signal is input into the single-chip microcomputer. The power supply circuit provides the working voltage for the single-chip microcomputer, and the single-chip microcomputer controls the output voltage and current of the Buck step-down constant current circuit according to the dimming signal, thereby realizing the dimming control of the LED module; in addition, in the zero-crossing detection circuit, the fuse FU1 is a self-recovering fuse, which plays a short-circuit protection role; the varistor VR1 plays an overvoltage protection role; when there is voltage, the optocoupler U1 has current, is in the on state, and the output end is at a low level. When crossing the zero point, no current flows through the optocoupler U1, it is in the off state, and the output end is at a high level.

[0032] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A deep dimming LED power supply, comprising: Buck step-down constant current circuit, dimming interface and LED module; characterized in that a single chip microcomputer is provided between the Buck step-down constant current circuit and the dimming interface; The single-chip microcomputer expands the dimming depth of 5% to 1% dimming depth. The single-chip microcomputer is connected to a power supply circuit and a zero-crossing detection circuit. The single-chip microcomputer serves as a controller of an LED power supply. The single-chip microcomputer detects an input power supply signal through a zero-crossing detection circuit to determine the current control color and uses a PWM signal to control the brightness of the lamp. The power supply circuit increases the operating voltage of the single-chip microcomputer.

2. A deep dimming LED power supply according to claim 1, characterized in that: The zero-crossing detection circuit is divided into four paths, corresponding to the red light, green light, blue light and dimming end respectively.

3. According to claim 1, a deep dimming LED power supply, characterized in that: The power supply circuit is composed of a step-down power supply module, a varistor, a fuse, a voltage stabilizing chip and a filter capacitor; the voltage is converted from AC to DC through the step-down power supply module, and the voltage is stabilized at the voltage required for work through the filter capacitor and the voltage stabilizing chip; the fuse plays a short-circuit protection role; the varistor plays an overvoltage protection role.

4. According to claim 1, a deep dimming LED power supply, characterized in that: The Buck step-down constant current circuit has a built-in Buck control chip.

5. The deep dimming LED power supply according to claim 1, characterized in that: The input end of the Buck step-down constant current circuit is connected to a power supply, and the output end is connected to the LED module. The dimming interface is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the Buck step-down constant current circuit.

6. The deep dimming LED power supply according to claim 1, characterized in that: The dimming interface consists of a 1-10V dimming interface and a 0-10V dimming interface, and a 5%-10% low dimming depth interface chip is built in the dimming interface.

7. The deep dimming LED power supply according to claim 1, characterized in that: The zero-crossing detection circuit includes: a resistor R1, a resistor R2, a resistor R3, a diode D1, a fuse FU1, a varistor VR1, a capacitor C1, a capacitor C2 and an optocoupler U1; The positive electrode of the diode D1 is connected to one end of the fuse FU1, and the other end of the fuse FU1 is simultaneously connected to the varistor VR1, one end of the capacitor C1 and one end of the resistor R1, pin 1 of the optocoupler U1 is connected to one end of the resistor R1, one end of the resistor R2 is simultaneously connected to the other end of the varistor VR1 and one end of the capacitor C1, pin 2 of the optocoupler U1 is connected to the other end of the resistor R2, pin 4 of the optocoupler U1 is simultaneously connected to one end of the resistor R3 and one end of the capacitor C2 and outputs a signal to the microcontroller, pin 3 of the optocoupler U1 is connected to the other end of the capacitor C2 and is grounded, and the other end of the resistor R3 inputs a voltage.

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