CN208113029U

CN208113029U - Automatic dimming circuit

Info

Publication number: CN208113029U
Application number: CN201820591241.1U
Authority: CN
Inventors: 崔玉峰
Original assignee: Shanghai North Medicine Polytron Technologies Inc
Current assignee: Shanghai North Medicine Polytron Technologies Inc
Priority date: 2018-04-24
Filing date: 2018-04-24
Publication date: 2018-11-16
Anticipated expiration: 2028-04-24

Abstract

The utility model provides a kind of automatic dimming circuit, including control chip, filtering adjust unit, light source voltage regulation unit, optical coupling isolation circuit, pwm signal interface and lamp source socket, and pwm signal interface passes through optical coupling isolation circuit connection control chip；It controls chip and unit ground connection is adjusted by filtering；Lamp source socket passes through light source voltage regulation unit connection control chip.The utility model structure is simple, easy for installation and cost is relatively low；The utility model circuit design is simple, and lamp source automatic adjustment can be realized by few device；The utility model stability is high, realizes continuous 16800 hours operation fault-frees；Based on the utility model, the switching frequency of adjusting LED lamp source is realized by adjusting the duty ratio of pwm signal, can be adjusted to the most bright state of LED lamp source with maximum 100% duty cycle.

Description

Automatic dimming circuit

Technical field

The utility model relates to light fields, and in particular, to a kind of automatic dimming circuit.

Background technique

Light is artificially to illuminate, and provides enough illumination at night or the insufficient occasion of natural light.But light consumption electricity Power, turn off when not needed light be can be energy saving.But in some periods and situation, if light can be transferred to compared with Dark degree, and energy consumption can be greatly reduced.

Many utilities buildings or place, such as airport, station, harbour, parking lot, street hospital, ward, factory, at night Light should not be all turned off, otherwise have action inconvenient or the misgivings of public security.Park, general merchandise, market, school, office block The places such as hall, lavatory, corridor, staircase, maintain the illumination of appropriateness after work, also can be convenient the member to work overtime Work, and avoid the dead angle of public security.Convenience store, gas station, hotel of 24 HOUR ACCESS etc., can also business at dead of night it is lighter When, light is dimmed a part, to save the electricity charge.

Traditional light adjusting circuit is all to achieve the purpose that adjust light-source brightness, current limliting electricity by adjusting the voltage value of lamp source What resistance was usually fixed, pwm signal adjust automatically in automation equipment cannot be utilized.This circuit can access pwm signal, PWM Signal is to achieve the purpose that adjust light-source brightness by adjusting the switching frequency of lamp source.

Utility model content

For the defects in the prior art, the purpose of the utility model is to provide a kind of automatic dimming circuits.

It is steady according to a kind of automatic dimming circuit provided by the utility model, including control chip, filtering adjusting unit, light source Unit, optical coupling isolation circuit, pwm signal interface and lamp source socket are pressed, wherein：

Pwm signal interface passes through optical coupling isolation circuit connection control chip；

It controls chip and unit ground connection is adjusted by filtering；

Lamp source socket passes through light source voltage regulation unit connection control chip.

Preferably, the control chip uses NCL30160 chip.

Preferably, it includes first resistor R1, second resistance R2 and capacitor C that the filtering, which adjusts unit, wherein：

One end of the first resistor R1 is grounded, the other end and control the first pin of chip, two of the first resistor R1 Pin connection；

One end connection control the 4th pin of chip of the second resistance R2, the other end of the second resistance R2 connect control The 5th pin of coremaking piece；

One end of the capacitor C is grounded；Other end connection control the 4th pin of chip of the capacitor C；

The third pin ground connection of the control chip.

Preferably, the light source voltage regulation unit includes inductance L, Schottky diode D and LED light, wherein：

The anode connection of the one end the inductance L, Schottky diode D controls the 8th pin of chip；

The first electrode of the inductance L other end access lamp source socket；

Cathode connection control the 7th pin of chip of the Schottky diode D；

LED light one end connection control the 7th pin of chip, the other end access the second electrode of lamp source socket.

Preferably, the optical coupling isolation circuit includes optocoupler, wherein：

The control terminal anode of the optocoupler constitutes the first power connector end；The control terminal cathode connection PWM letter of the optocoupler Number interface；

Controlled terminal one end access of the optocoupler constitutes second source connecting pin, and other end access control chip the 6th draws Foot.

It preferably, further include protective resistance R3, the one end protective resistance R3 is grounded, and other end connection control chip the 6th draws Foot.

Compared with prior art, the utility model has following beneficial effect：

1, the utility model structure is simple, easy for installation and cost is relatively low；

2, the utility model circuit design is simple, and the hardware platform of lamp source automatic adjustment can be realized by few device；

3, the utility model stability is high, realizes continuous 16800 hours operation fault-frees；

4, it is based on the utility model, the switching frequency of adjusting LED lamp source, energy are realized by adjusting the duty ratio of pwm signal With maximum 100% duty cycle, the most bright state of LED lamp source can be adjusted to.

Detailed description of the invention

Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model Sign, objects and advantages will become more apparent upon：

Fig. 1 is the electrical block diagram of the utility model.

Specific embodiment

The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability For the those of ordinary skill in domain, without departing from the concept of the premise utility, several changes and improvements can also be made. These are all within the protection scope of the present invention.

As shown in Figure 1, being controlled using NCL30160 as LED according to a kind of automatic dimming circuit provided by the utility model Coremaking piece, periphery are equipped with first resistor R1, second resistance R2, protective resistance R3, protective resistance R4, capacitor C, Schottky diode D, inductance L, LED light, lamp source socket P and optocoupler.

Specifically, the first and second pin of control chip connects the one end first resistor R1, the first resistor R1 other end is grounded, First resistor R1 is used to adjust the susceptibility of electric current；Control the third pin ground connection of chip；Control the 4th pin connection of chip The one end capacitor C, capacitor C other end ground connection, capacitor C are used to filter to logic voltage；The one end second resistance R2 connection control chip 4th pin, other end connection control the 5th pin of chip, second resistance R2 are used to adjust the timer switch frequency of chip interior Rate；The 6th pin for controlling chip accesses optocoupler, specifically, the control terminal anode of the optocoupler is accessed by protective resistance R4 3.3V power supply；The control terminal cathode of the optocoupler accesses pwm signal；5V voltage is accessed in controlled terminal one end of the optocoupler, separately One end access control the 6th pin of chip；The anode connection control chip the 8th of the one end the inductance L and Schottky diode D draw Foot；The first electrode of the inductance L other end access lamp source socket P；The cathode connection control chip of the Schottky diode D 7th pin；LED light one end connection control the 7th pin of chip, the other end access the second motor of lamp source socket P.Inductance L is used for the voltage fluctuation of stabilized light source, and Schottky diode D is used to form the current loop in the case of lamp source does not work completely, lamp Supply socket P is used for the socket in mounted LED lamp source.

Based on the utility model, the switching frequency of adjusting LED lamp source, lamp source are realized by adjusting the duty ratio of pwm signal Switch motion is ceaselessly being done, frequency is higher, and brighter display, frequency is about low, and brightness is darker, to realize the automatic of lamp source brightness It adjusts, lamp source can be transferred to most bright state from OFF state with maximum 100% duty cycle.The utility model uses Buck topology structure is passed through NCL30160 and is controlled using output electric current sluggishness, it is intended to maintain electric current with the threshold level of setting The peak value and the lowest point value of ripple can work in up to 1.4MHz frequency.The voltage power supply range of LED light is 6.3 to 40V.This The optical coupling isolation circuit of utility model can be compatible with for the MCU system of 3.3V or the MCU system of 5V or other MCU systems, answer It is wider with range.

Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office It is limited to above-mentioned particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, This has no effect on the substantive content of the utility model.In the absence of conflict, the spy in embodiments herein and embodiment Sign can be arbitrarily combined with each other.

Claims

1. a kind of automatic dimming circuit, which is characterized in that adjust unit, light source voltage regulation unit, optocoupler including control chip, filtering Isolation circuit, pwm signal interface and lamp source socket, wherein：

It controls chip and unit ground connection is adjusted by filtering；

2. automatic dimming circuit according to claim 1, which is characterized in that the control chip uses NCL30160 core Piece.

3. automatic dimming circuit according to claim 2, which is characterized in that it includes first resistor that the filtering, which adjusts unit, R1, second resistance R2 and capacitor C, wherein：

One end of the first resistor R1 is grounded, the other end and control the first pin of chip, two pins of the first resistor R1 Connection；

One end connection control the 4th pin of chip of the second resistance R2, the other end connection control core of the second resistance R2 The 5th pin of piece；

The third pin ground connection of the control chip.

4. automatic dimming circuit according to claim 2, which is characterized in that the light source voltage regulation unit includes inductance L, Xiao Special based diode D and LED light, wherein：

The first electrode of the inductance L other end access lamp source socket；

Cathode connection control the 7th pin of chip of the Schottky diode D；

5. automatic dimming circuit according to claim 2, which is characterized in that the optical coupling isolation circuit includes optocoupler, In：

The control terminal anode of the optocoupler constitutes the first power connector end；The control terminal cathode connection pwm signal of the optocoupler connects Mouthful；

Controlled terminal one end access of the optocoupler constitutes second source connecting pin, other end access control the 6th pin of chip.

6. automatic dimming circuit according to claim 5, which is characterized in that further include protective resistance R3, protective resistance R3 One end ground connection, other end connection control the 6th pin of chip.