CN216852435U

CN216852435U - LED drive circuit capable of adjusting light and conducting color and turning on for gradually brightening

Info

Publication number: CN216852435U
Application number: CN202123028197.4U
Authority: CN
Inventors: 李希龙; 张琤; 何增军
Original assignee: Xiamen Longstar Lighting Co Ltd
Current assignee: Xiamen Longstar Lighting Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-06-28
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a dimming and turning on gradually bright LED drive circuit, which comprises a rectification filter module, a main control chip U4, and constant current drive chips U1 and U3; the rectification filtering module is used for converting commercial power into direct-current bus voltage and supplying power to the main control chip U4; a first signal output end of the main control chip U4 is connected with a signal input end of the constant current driving chip U1, and a second signal output end of the main control chip U4 is connected with a signal input end of the constant current driving chip U3; the main control chip outputs PWM1 signals and PWM2 signals to the constant current driving chips U1 and U3 through a first signal output end and a second signal output end; when the commercial power is electrified, the main control chip U4 outputs a PWM1 signal and a PWM2 signal with the duty ratios gradually increased from 0-100% to the constant current driving chips U1 and U3; when the main control chip U4 receives the color temperature switching signal, the main control chip U4 outputs a PWM1 signal and a PWM2 signal, the sum of the proportions of which is 100%, to the constant current driving chips U1 and U3; when the main control chip U4 receives the dimming signal, the main control chip U4 outputs a fixed PWM1 signal and a fixed PWM2 signal to the constant current driving chips U1 and U3.

Description

LED drive circuit capable of adjusting light and conducting color and turning on for gradually brightening

Technical Field

The utility model relates to a LED especially relates to LED's drive circuit.

Background

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the main technical problem that a LED drive circuit is provided, for realizing the tone modulation and tone and open the hardware circuit basis that brightens gradually.

In order to solve the technical problem, the utility model provides a dimming and turning on the LED drive circuit that brightens gradually, including rectification filter module, main control chip U4, constant current drive chip U1, U3;

the rectification filtering module is used for converting commercial power into direct-current bus voltage and supplying power to the main control chip U4; a first signal output end of the main control chip U4 is connected with a signal input end of the constant current driving chip U1, and a second signal output end of the main control chip U4 is connected with a signal input end of the constant current driving chip U3; the main control chip outputs PWM1 signals and PWM2 signals to the constant current driving chips U1 and U3 through a first signal output end and a second signal output end;

when the commercial power is electrified, the main control chip U4 outputs a PWM1 signal and a PWM2 signal with the duty ratios gradually increased from 0-100% to the constant current driving chips U1 and U3; when the main control chip U4 receives the color temperature switching signal, the main control chip U4 outputs a PWM1 signal and a PWM2 signal, the sum of the proportions of which is 100%, to the constant current driving chips U1 and U3; when the main control chip U4 receives the dimming signal, the main control chip U4 outputs a fixed PWM1 signal and a fixed PWM2 signal to the constant current driving chips U1 and U3.

In a preferred embodiment: the rectifying and filtering module comprises a rectifying bridge, an inductor L1, a capacitor C1 and a capacitor C2;

the alternating current input end of the rectifier bridge is connected to the commercial power, the direct current output positive electrode is connected to the inductor L1, and the capacitor C1 and the capacitor C2 are connected between the two ends of the inductor L1 and the direct current output negative electrode respectively.

In a preferred embodiment: the output end of the constant current driving chip U1 is connected to the anode of the LED 2; the anode and the cathode of the LED2 are connected through a resistor R1, the resistor R1 is connected in parallel with an electrolytic capacitor EC6, and the resistor R1 is connected to the cathode of the direct current output through a capacitor C3.

In a preferred embodiment: the output end of the constant current driving chip U3 is connected to the anode of the LED 1; the anode and the cathode of the LED1 are connected through a resistor R2, the resistor R2 is connected in parallel with an electrolytic capacitor EC5, and the resistor R2 is connected to the cathode of the direct current output through a capacitor C4.

In a preferred embodiment: the color temperature of the light emitted by the LED1 is different from that of the light emitted by the LED 2.

In a preferred embodiment: and a pin 5 of the constant current driving chip U3 is connected to the cathode of the LED1 through an inductor T1.

In a preferred embodiment: and a pin 5 of the constant current driving chip U1 is connected to the cathode of the LED2 through an inductor T1.

Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:

the utility model provides a light-adjustable color mixing and open LED drive circuit who brightens gradually, when the LN was gone up the electricity, U4 passed through after power supply unit obtains a stable supply voltage through PWM1 and PWM2 output one 0-100% increase gradually the signal for U1 with U3 for two way drives increase gradually from the 0-100% of setting for the electric current, realize the function of brightens gradually. When the two ends of the GS detect set high and low level signals (color temperature switching signals), the main control chip U4 outputs a PWM signal with a certain proportion and the proportion sum of 100% to the U1 and U3 driving circuits through the pins PWM1 and PWM2, so that the two paths of driven LED lamp beads are mixed, and the color temperature switching function is realized. When a set high-low level signal (dimming signal) is detected at two ends of the GS, the main control core U4 outputs a fixed PWM signal to the U1 and U3 driving circuits through the PWM1 and the PWM2 pins, so that the output current of the two-way driving is selected to be fixed at 0-100%. Thereby realizing a dimming function.

Drawings

Fig. 1 is a circuit diagram of the preferred embodiment of the present invention.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be a wall-mounted connection, a detachable connection, or an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention in a specific case.

Referring to fig. 1, the present embodiment provides an LED driving circuit capable of dimming and turning on and dimming, including a rectifying and filtering module, a main control chip U4, and constant current driving chips U1 and U3;

When the LN is powered on, the U4 obtains a stable power supply voltage through the power supply device, and then outputs a 0-100% increasing signal to the U1 and the U3 through the PWM1 and the PWM2, so that the two paths of drives increase from 0-100% of the set current, and the brightness-reducing function is realized. When the two ends of the GS detect set high and low level signals (color temperature switching signals), the main control chip U4 outputs a PWM signal with a certain proportion and the proportion sum of 100% to the U1 and U3 driving circuits through the pins PWM1 and PWM2, so that the two paths of driven LED lamp beads are mixed, and the color temperature switching function is realized. When a set high-low level signal (dimming signal) is detected at two ends of the GS, the main control core U4 outputs a fixed PWM signal to the U1 and U3 driving circuits through the PWM1 and the PWM2 pins, so that the output current of the two-way driving is selected to be fixed at 0-100%. Thereby realizing a dimming function.

Specifically, in order to implement the above circuit principle, the rectifier and filter module in this embodiment includes a rectifier bridge, an inductor L1, a capacitor C1, and a capacitor C2; the alternating current input end of the rectifier bridge is connected to the commercial power, the direct current output positive electrode is connected to the inductor L1, and the capacitor C1 and the capacitor C2 are respectively connected between the two ends of the inductor L1 and the direct current output negative electrode.

The output end of the constant current driving chip U1 is connected to the anode of the LED 2; the anode and the cathode of the LED2 are connected through a resistor R1, the resistor R1 is connected in parallel with an electrolytic capacitor EC6, and the resistor R1 is connected to the cathode of the direct current output through a capacitor C3. The output end of the constant current driving chip U3 is connected to the anode of the LED 1; the anode and the cathode of the LED1 are connected through a resistor R2, the resistor R2 is connected in parallel with an electrolytic capacitor EC5, and the resistor R2 is connected to the cathode of the direct current output through a capacitor C4.

In order to realize color modulation, the color temperature of the light emitted by the LED1 is different from that of the light emitted by the LED 2.

In addition, the pin 5 of the constant current driving chip U3 is connected to the cathode of the LED1 through an inductor T1. And a pin 5 of the constant current driving chip U1 is connected to the cathode of the LED2 through an inductor T1.

The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.

Claims

1. A LED drive circuit capable of adjusting light and dimming and turning on and brightening is characterized by comprising a rectification filter module, a main control chip U4, and constant current drive chips U1 and U3;

2. The LED driving circuit for dimming and turning on dimming as claimed in claim 1, wherein: the rectifying and filtering module comprises a rectifying bridge, an inductor L1, a capacitor C1 and a capacitor C2;

the alternating current input end of the rectifier bridge is connected to the commercial power, the direct current output positive electrode is connected to the inductor L1, and the capacitor C1 and the capacitor C2 are respectively connected between the two ends of the inductor L1 and the direct current output negative electrode.

3. The LED driving circuit for dimming and turning on dimming as claimed in claim 2, wherein: the output end of the constant current driving chip U1 is connected to the anode of the LED 2; the anode and the cathode of the LED2 are connected through a resistor R1, the resistor R1 is connected in parallel with an electrolytic capacitor EC6, and the resistor R1 is connected to the cathode of the direct current output through a capacitor C3.

4. The LED driving circuit of claim 3, wherein: the output end of the constant current driving chip U3 is connected to the anode of the LED 1; the anode and the cathode of the LED1 are connected through a resistor R2, the resistor R2 is connected in parallel with an electrolytic capacitor EC5, and the resistor R2 is connected to the cathode of the direct current output through a capacitor C4.

5. The LED driving circuit for dimming and turning on dimming as claimed in claim 4, wherein: the color temperature of the light emitted by the LED1 is different from that of the light emitted by the LED 2.

6. The LED driving circuit for dimming and turning on dimming as claimed in claim 5, wherein: and a pin 5 of the constant current driving chip U3 is connected to the cathode of the LED1 through an inductor T1.

7. The LED driving circuit of claim 6, wherein: and a pin 5 of the constant current driving chip U1 is connected to the cathode of the LED2 through an inductor T1.