CN210745616U

CN210745616U - Stroboscopic removing circuit for improving dimming effect of LED lamp

Info

Publication number: CN210745616U
Application number: CN201921843764.1U
Authority: CN
Inventors: 田鹏
Original assignee: Shenzhen Jieke Digital Co ltd
Current assignee: Shenzhen Jieke Digital Co ltd; Shenzhen GIEC Electronics Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-06-12
Anticipated expiration: 2029-10-28

Abstract

The utility model is suitable for a LED dimming technical field provides a remove stroboscopic circuit of LED lamps and lanterns light modulation effect improves, including voltage analog control module, light modulation chip and power control module; the dimming chip comprises a first pin, a second pin, a third pin, a fourth pin and a fifth pin; the fifth pin is connected with power supply voltage, and the second pin is grounded; the output end of the voltage analog control module is connected with the third pin and provides analog voltage for the dimming chip; the power control module is respectively connected with the fourth pin and the first pin, the fourth pin is further connected with the input end of the LED lighting module, and the first pin is further connected with the output end of the LED lighting module. Through the utility model discloses can reduce the factor that leads to stroboscopic phenomenon, improve LED lamps and lanterns effect of adjusting luminance.

Description

Stroboscopic removing circuit for improving dimming effect of LED lamp

Technical Field

The utility model relates to a LED technical field that adjusts luminance especially relates to an improve stroboscopic circuit that removes of LED lamps and lanterns effect of adjusting luminance.

Background

Whether the existing lighting product has the dimming function is very important, and the lighting product with the dimming function not only aims at creating a more comfortable environment in a home, but also aims at reducing unnecessary electric rays so as to further achieve the purposes of energy conservation and emission reduction. For the lamp using the LED as the light source, the dimming function is easier to be realized than the lamp using other light sources, such as fluorescent lamp, energy saving lamp, and high pressure sodium lamp.

At present, a PWM (Pulse Width Modulation) technology is generally used to implement a dimming function of an LED, and dimming of an LED lamp is accomplished by modulating an LED driving current. However, in the process of changing the magnitude of the driving current, the color temperature of the LED chip is affected to some extent, which causes a stroboscopic phenomenon.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides an improve LED lamps and lanterns effect of adjusting luminance remove stroboscopic circuit to in solving current LED technique of adjusting luminance, drive current's variation in size can lead to stroboscopic phenomenon's problem.

In order to achieve the above object, a first aspect of the embodiments of the present invention provides a stroboscopic removing circuit for improving a dimming effect of an LED lamp, including a voltage analog control module, a dimming chip and a power control module;

the dimming chip comprises a first pin, a second pin, a third pin, a fourth pin and a fifth pin;

the fifth pin is connected with a power supply voltage, and the second pin is grounded;

the output end of the voltage analog control module is connected with the third pin and provides analog voltage for the dimming chip;

the power control module is respectively connected with the fourth pin and the first pin, the fourth pin is further connected with the input end of the LED lighting module, and the first pin is further connected with the output end of the LED lighting module.

Optionally, the output voltage of the voltage analog control module is 0-3.3V.

Optionally, the operating frequency of the dimming chip is between 233KHz and 1000 KHz.

Optionally, the voltage analog control module comprises a microprocessor and a digital-to-analog converter;

the microprocessor is connected with the digital-to-analog converter;

the digital-to-analog converter is connected with the third pin.

Optionally, the power control module comprises a linear resistor.

Optionally, the dimming chip comprises a PWN dimming mode and an analog voltage dimming mode.

Optionally, the stroboscopic removing circuit for improving the dimming effect of the LED lamp further comprises a leakage protection module;

the leakage protection module comprises a rectifier diode and a capacitor;

the anode of the rectifier diode is connected with the first pin, and the cathode of the rectifier diode is connected with the fifth pin;

one end of the capacitor is connected with the anode of the rectifier diode, and the other end of the capacitor is grounded.

Optionally, the stroboscopic removing circuit for improving the dimming effect of the LED lamp further comprises a current conversion module;

the current conversion module is connected in series between the first pin and the output end of the LED lighting module.

The embodiment of the utility model provides a stroboscopic removing circuit for improving the dimming effect of an LED lamp, which is characterized in that an LED lighting module and a voltage simulation control module are connected into a dimming chip, the LED lighting module is powered by the dimming chip, the voltage between a first pin and a fourth pin of the dimming chip for powering the LED lighting module is controlled by the voltage simulation control module, the analog voltage output from the dimming chip to the LED lighting module is controlled by the voltage simulation control module, and the power control module determines, wherein, the LED lighting module is powered by the analog voltage, the voltage can be accurately output step by step in the dimming process, the variation of the driving current between the dimming chip and the LED lighting module is reduced, and, analog voltage still makes the operating frequency of chip of adjusting luminance stable within the certain limit, consequently, the utility model provides a remove stroboscopic circuit can reduce the factor that leads to stroboscopic phenomenon, improves LED lamps and lanterns effect of adjusting luminance.

Drawings

Fig. 1 is a schematic structural diagram of a stroboscopic removing circuit for improving a dimming effect of an LED lamp according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a stroboscopic removing circuit for improving the dimming effect of the LED lamp provided by the embodiment of the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Suffixes such as "module", "part", or "unit" used to denote elements herein are used only for the convenience of description of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.

In the following description, the serial numbers of the embodiments of the present invention are for description only, and do not represent the merits of the embodiments.

Example one

As shown in fig. 1, an embodiment of the present invention provides a stroboscopic removing circuit 100 for improving dimming effect of an LED lamp, including a voltage analog control module 10, a dimming chip 20, and a power control module 30. The dimming chip 20 includes a first pin 221, a second pin 22, a third pin 23, a fourth pin 24, and a fifth pin 25.

Referring to fig. 1, in the embodiment of the present invention, the connection relationship between the device modules in the circuit is as follows:

the output terminal of the voltage analog control module 10 is connected to the third pin 23 to provide an analog voltage to the dimming chip 20, the fifth pin 25 is further connected to a power voltage, and the second pin 22 is grounded, wherein the input voltage of the dimming chip 20 is determined by the power supply, but the operating voltage of the dimming chip 20 and the voltage output to other devices are determined by the analog voltage.

The power control module 30 is connected in parallel between the fourth pin 24 and the first pin 25, the fourth pin 24 is connected with the input terminal of the LED lighting module 50, and the first pin 221 is connected with the output terminal of the LED lighting module 40. The power control module 30 is equivalently connected in parallel with the LED lighting module 40 with the same voltage value, while the value of the current through the LED lighting module 40 is influenced by the power control module 30.

The utility model provides an improve stroboscopic circuit 100's that removes of LED lamps and lanterns effect of adjusting luminance theory of operation does:

the maximum power of the LED lighting module is set through the power control module, then the voltage simulation control module sets the range of the simulation voltage according to the maximum power, and the simulation voltage is output to the third pin of the dimming chip, so that the working frequency of the dimming chip is controlled. After the range of the analog voltage is set, the value of the analog voltage which changes from 0 to the maximum voltage step by step is set, the frequency in the dimming chip is stably increased or decreased gradually due to the accurate output of the analog voltage, and the change of the driving current between the dimming chip and the LED lighting module is also in a stable state.

The embodiment of the utility model provides an in, voltage analog control module's output voltage is 0 ~ 3.3V. The working frequency of the light adjusting chip is between 233KHz and 1000 KHz. Wherein, when the operating frequency of the chip of adjusting luminance is at certain numerical value, will influence the effect of adjusting luminance, consequently the operating frequency of the chip of adjusting luminance of analog voltage control through voltage analog control module is above 233KHz, avoids the stroboscopic phenomenon that the low frequency caused.

The stroboscopic eliminating circuit for improving the dimming effect of the LED lamp provided by the embodiment of the utility model has the advantages that the LED lighting module and the voltage simulation control module are connected into the dimming chip, the dimming chip supplies power to the LED lighting module, the voltage between the first pin and the fourth pin of the dimming chip supplying power to the LED lighting module is controlled by the voltage simulation control module, the analog voltage output from the dimming chip to the LED lighting module is controlled by the voltage simulation control module, and the power control module determines, wherein, the LED lighting module is powered by the analog voltage, the voltage can be accurately output step by step in the dimming process, the variation of the driving current between the dimming chip and the LED lighting module is reduced, and, analog voltage still makes the operating frequency of chip of adjusting luminance stable within the certain limit, consequently, the utility model provides a remove stroboscopic circuit can reduce the factor that leads to stroboscopic phenomenon, improves LED lamps and lanterns effect of adjusting luminance.

Example two

As shown in fig. 2, the embodiment of the utility model provides a still provide improve the structural schematic diagram that removes the stroboscopic circuit of LED lamps and lanterns effect of adjusting luminance, fig. 2 shows voltage analog control module, the specific structure of adjusting luminance chip and power control module in embodiment one, has still provided other functional structures, supplements the stroboscopic circuit that removes of improvement LED lamps and lanterns effect of adjusting luminance in embodiment one.

In the embodiment of the utility model provides an in, use PAM2861 chip as the chip of adjusting luminance, realize above-mentioned embodiment one the embodiment of the utility model provides an in function. The first pin 21 is a low level input LX, the second pin is a ground GND, the third pin is a set voltage input VSET, the fourth pin is an inductive current sensor access ISENSE, and the fifth pin 25 is a VCC voltage input VIN.

Referring to fig. 2, in the embodiment of the present invention, the voltage analog control module 10 includes a microprocessor 11 and a digital-to-analog converter 12; the microprocessor 11 is connected with the digital-to-analog converter 12; the digital-to-analog converter 11 is connected 23 to the third pin.

In a specific application, the microprocessor is used for controlling the digital-to-analog converter to accurately output 0V-3.3V to the third pin of the PAM2861 chip.

In a specific application, the microprocessor may be an MCU (micro controller Unit), and if the MCU has a DAC output, digital-to-analog conversion in the MCU may be directly adopted.

Referring to fig. 2, in the embodiment of the present invention, the power control module 30 includes a linear resistor, wherein a value of the linear resistor is related to an operating voltage of the LED lighting module.

In a specific application, as long as the value of the linear resistor is reasonable, the direct current power supply is not influenced, and the pulse component of the direct current is reduced to be not influenced for amplifying a signal.

The power control module may also be any type of linearly varying or adjustable resistance in a particular application.

In the embodiment of the present invention, the dimming chip includes a PWN dimming mode and an analog voltage dimming mode; when the dimming chip is in the PWN dimming mode, the voltage analog control module does not output analog voltage to the dimming chip, and the dimming of the LED lamp is completed by directly modulating the LED driving current through the dimming chip.

When the circuit has overload or short circuit fault, the chip will be damaged, and then the leakage protection circuit should be designed in the light modulation chip to prevent the above-mentioned fault and chip damage accident.

Referring to fig. 2, the stroboscopic removing circuit 100 for improving the dimming effect of the LED lamp according to the embodiment of the present invention further includes an earth leakage protection module 50.

The earth leakage protection module 50 includes a rectifying diode 51 (not shown) and a capacitor 52 (not shown), wherein an anode of the rectifying diode 51 is connected to the first pin 21, and a cathode of the rectifying diode 51 is connected to the fifth pin 25; one end of the capacitor 52 is connected to the anode of the rectifier diode 51, and the other end of the capacitor 52 is grounded.

In a particular application, rectifier diode 51 converts alternating current to direct current, while capacitor 52 filters the direct current and grounds other leakage currents.

Referring to fig. 2, the stroboscopic removing circuit 100 for improving the dimming effect of the LED lamp according to the embodiment of the present invention further includes a current conversion module 60;

the current conversion module 60 is connected in series between the first pin 21 and the output end of the LED lighting module 30, so as to achieve the effect of rectification and filtering, and make the current output to the LED lighting module 30 be direct current.

In a specific application, the current conversion module may be any circuit component that implements ac-dc conversion, such as a current converter, an analog-to-digital converter, an inductor, and the like.

The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the foregoing embodiments illustrate the present invention in detail, those skilled in the art will appreciate that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. A stroboscopic removing circuit for improving the dimming effect of an LED lamp is characterized by comprising a voltage analog control module, a dimming chip and a power control module;

2. The stroboscopic removing circuit for improving the dimming effect of the LED lamp as claimed in claim 1, wherein the output voltage of the voltage analog control module is 0-3.3V.

3. The stroboscopic removing circuit for improving the dimming effect of the LED lamp as claimed in claim 1, wherein the operating frequency of the dimming chip is between 233KHz and 1000 KHz.

4. The stroboscopic removing circuit for improving the dimming effect of the LED lamp as claimed in claim 1, wherein the voltage analog control module comprises a microprocessor and a digital-to-analog converter;

the microprocessor is connected with the digital-to-analog converter;

the digital-to-analog converter is connected with the third pin.

5. The stroboscopic removal circuit for improving the dimming effect of an LED lamp as claimed in claim 1, wherein the power control module comprises a linear resistor.

6. The stroboscopic removal circuit for improving dimming effect of LED lamp according to claim 1, wherein the dimming chip comprises PWN dimming mode and analog voltage dimming mode.

7. The stroboscopic removing circuit for improving the dimming effect of the LED lamp as claimed in claim 1, further comprising a leakage protection module;

the leakage protection module comprises a rectifier diode and a capacitor;

8. The stroboscopic removing circuit for improving the dimming effect of the LED lamp as claimed in claim 1, further comprising a current conversion module;