CN104168698A

CN104168698A - Practical keyed LED light dimming device

Info

Publication number: CN104168698A
Application number: CN201410402124.2A
Authority: CN
Inventors: 叶鸣
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-08-15
Filing date: 2014-08-15
Publication date: 2014-11-26

Abstract

The invention discloses a practical keyed LED light dimming device which is provided with two control keys. When the practical keyed LED light dimming device is used, light becomes bright gradually when the key S1 is pressed for a long time, the key S1 is released until the needed brightness is achieved, and a lamp keeps the brightness achieved when the key S1 is released; light becomes dark gradually when the key S2 is pressed for a long time, the key S2 is released until the needed brightness is achieved, and the lamp keeps the brightness achieved when the key S1 is released; the lamp can be turned on or turned off immediately by pressing the key S1 and the key S2 at the same time. In this way, the two keys are used as power switches.

Description

A kind of keying LED light modulating device of practicality

Technical field

The present invention relates to a kind of LED light modulating device that can be used for illumination of practicality.

Background technology

In existing technology, the mode that realizes LED light modulation is generally to adopt analog circuit to carry out light modulation, this light-dimming method is generally that the pattern taking operational amplifier as core realizes, it is the light modulation chip that oneself has been released in basis that a lot of integrated circuit companies has also adopted technique, but exist light-modulating mode to solidify, certain chip only has just can have good dimming effect to specific certain light source, be difficult to realize the light source applications without voltage drop and size of current is carried out to good brightness linear regulation, in light modulation process, there will be in the time of light modulation, the all or part of womp or prominent dark phenomenon of light source, be difficult to meet real requirement.

Summary of the invention

The technical problem to be solved in the present invention is: for existing technological deficiency, provide a kind of keying light modulating device of desirable figure pattern, the ideal linearity of realizing the brightness of lighting regulates.

The technical solution adopted for the present invention to solve the technical problems is, designs a kind of LED light modulating device of keying, and it comprises:

1. button inputting circuits: formed by key switch S1 and S2, this switch in press...withing one's finger, in conducting state, in the time that finger leaves, the just state in opening circuit;

2. single-chip microcomputer change-over circuit: the function of single-chip microcomputer change-over circuit be output duty cycle between 0 and 1, the peak value pwm signal that is 5V, as dim signal.Its working method is, if press touch key S1, when touch key S1 is during in conducting state, corresponding I/O mouth is in low level, software detection arrives corresponding port after low level, just make the PWM duty ratio of output signal increase gradually, seeing the brightness of light when eyes is increased to when suitable, just decontrol S1, at this moment S1 opens circuit, corresponding I/O mouth is in high level state, at this moment the duty ratio of the pwm signal of output just maintains constant at that moment that S1 opens circuit, if press touch key S2, when touch key S2 is during in conducting state, corresponding I/O mouth is in low level, software detection arrives corresponding port after low level, just make the PWM duty ratio of exporting new signal reduce gradually, in the time that eyes see that the brightness of light reduces to suitable, just decontrol S2, at this moment S2 opens circuit, corresponding I/O mouth is in high level state, at this moment the duty ratio of the pwm signal of output just maintains constant at that moment that S2 opens circuit! in the moment of complete machine start, can in software, set arbitrarily a fixing PWM and export a corresponding corresponding brightness, such as being 50%, a half bright state that this LED light source that is is 50% in brightness! then can use as required S1 and S2 brightness adjusting easily.

If light source is in the time of a brightness; Single Chip Microcomputer (SCM) PWM is exported between 0-100; while pinning S1 and S2, after software will detect, making the pwm signal output of single-chip microcomputer will become 0 is no-output state simultaneously; namely light source extinguishes state; when brightness before extinguishing as recovered, then press simultaneously S1 and S2 both can, use so press the switch that S1 and S2 can be used as light source simultaneously; or pin S1, make brightness increase and also can gradually;

3. level shifting circuit: due to the difference of LED driving power; requirement to dim signal also need not; has plenty of the direct current signal of requirement 0-10V; has plenty of the direct current signal of requirement 0-5V; has plenty of requirement pwm signal; so need a level shifting circuit to come single-chip microcomputer output signal to be transformed to the dim signal that is applicable to driving power needs, if the dim signal that LED driving power used needs just in time mates with single-chip microcomputer output signal, this part level shifting circuit can save;

4. LED driving power: the circuit of this part is that general high frequency switch power forms, controls the interface with a light modulation on IC at center, by changing this interface signal, can control the electric current by LED light source, seems namely brightness;

5. LED light source: according to the actual needs, can be monochromatic light source, can be also colored light source, both single chips composition, also can be made up of the chip of many;

6. complete machine DC power supply; This small power supply is to provide working power for the IC of complete machine.

The keying LED light modulating device of above-described a kind of practicality, it is characterized in that: use intelligent single-chip microcomputer, with 2 hand switch S1 and S2, make respectively the functional switch that brightness increase and brightness reduce, pin one of them switch, when switch connection, the pwm signal that single-chip microcomputer output duty cycle is variable, by (if required) after level conversion, offer the signal that LED HF switch driving power does light modulation, can change by the light source to different the parameter of programming, make the light modulation of various light sources realize the linearisation of handfeel of keys, make keying light modulation be achieved perfect condition, pin 2 switches simultaneously, the quick switch that can make complete machine uses!

The keying LED light modulating device of above-described a kind of practicality, is characterized in that: quantity and the color of described LED light source are not limit.

The keying LED light modulating device of above-described a kind of practicality, is characterized in that: the kind of described single-chip microcomputer is not limit.

Brief description of the drawings

Fig. 1 is the schematic diagram of allomeric function.

Embodiment

First single-chip microcomputer is programmed, then turn on the electricity, after power on circuitry, if S1 and S2 are in off state, S1 and S2 are input to the port of single-chip microcomputer at high level state, circuit will keep standing state constant, when pinning S1 and not putting, single-chip microcomputer S1 port is in low level, program in single-chip microcomputer detects that S1 is level state, program increases the duty ratio of single-chip microcomputer output gradually, if finger is decontroled S1, the port that at this moment S1 inputs to single-chip microcomputer is high level, duty ratio size rests on finger and decontrols the instantaneous of button so, with this duty cycle signals by level conversion (during as needs, determine according to different LED driving powers) can control the operating current size that LED driving power provides to light source, thereby control the brightness of LED, in like manner, pin S2, program will detect that single-chip microcomputer connects S2 port in low level state, program reduces single-chip microcomputer output duty cycle gradually, also can control the size of brightness, different LED operating current corresponding to duty ratio, namely corresponding brightness size, thus realize light modulation!

In the time pressing S1 and S2 simultaneously, if light source at illuminating state, so, the PWM of single-chip microcomputer output becomes 0, light source also extinguishes thereupon, presses S1 and S2 simultaneously and can do total power switch and use! When brightness before extinguishing as recovered, then press simultaneously S1 and S2 both can, use so press the switch that S1 and S2 can be used as light source simultaneously, or pin S1, allow brightness increase and also can gradually!

The constant current control method of switch power converter belongs to the technology of disclosed maturation, and this specification no longer relates to description.Core of the present invention is used key switch exactly, and the time length of the switching signal that presses & hold is become to PWM dim signal by single-chip microcomputer, afterwards LED high frequency switch power is carried out to light modulation through level translation!

In sum, change and modification that the design of the present invention of all foundations is made, all in claim protection range of the present invention.

Claims

1. a practical keying LED light modulating device, is characterized in that, comprises:

Button inputting circuits: formed by touch key switch S 1 and S2, this switch in press...withing one's finger, in conducting state, in the time that finger leaves, the just state in opening circuit;

Single-chip microcomputer change-over circuit: the function of single-chip microcomputer change-over circuit be output duty cycle between 0 and 1, the peak value pwm signal that is 5V, as dim signal;

Its working method is, if press touch key S1, when touch key S1 is during in conducting state, corresponding I/O mouth is in low level, software detection arrives corresponding port after low level, just make the PWM duty ratio of output signal increase gradually, seeing the brightness of light when eyes is increased to when suitable, just decontrol S1, at this moment S1 opens circuit, corresponding I/O mouth is in high level state, at this moment the duty ratio of the pwm signal of output just maintains constant at that moment that S1 opens circuit, if press touch key S2, when touch key S2 is during in conducting state, corresponding I/O mouth is in low level, software detection arrives corresponding port after low level, just make the PWM duty ratio of exporting new signal reduce gradually, in the time that eyes see that the brightness of light reduces to suitable, just decontrol S2, at this moment S2 opens circuit, corresponding I/O mouth is in high level state, at this moment the duty ratio of the pwm signal of output just maintains constant at that moment that S2 opens circuit! in the moment of complete machine start, can in software, set arbitrarily a fixing PWM and export a corresponding corresponding brightness, such as being 50%, a half bright state that this LED light source that is is 50% in brightness! then can use as required S1 and S2 brightness adjusting easily,

?if light source is in the time of a brightness; Single Chip Microcomputer (SCM) PWM is exported between 0-100; while pinning S1 and S2, after software will detect, making the pwm signal output of single-chip microcomputer will become 0 is no-output state simultaneously; namely light source extinguishes state; when brightness before extinguishing as recovered, then press simultaneously S1 and S2 both can, use so press the switch that S1 and S2 can be used as light source simultaneously; or pin S1, make brightness increase and also can gradually;

Level shifting circuit: due to the difference of LED driving power; requirement to dim signal also need not; has plenty of the direct current signal of requirement 0-10V; has plenty of the direct current signal of requirement 0-5V; has plenty of requirement pwm signal; so need a level shifting circuit to come single-chip microcomputer output signal to be transformed to the dim signal that is applicable to driving power needs, if the dim signal that LED driving power used needs just in time mates with single-chip microcomputer output signal, this part level shifting circuit can save;

LED driving power: the circuit of this part is that general high frequency switch power forms, controls the interface with a light modulation on IC at center, by changing this interface signal, can control the electric current by LED light source, seems namely brightness;

LED light source: according to the actual needs, can be monochromatic light source, can be also colored light source, both single chips composition, also can be made up of the chip of many;

Complete machine DC power supply; This small power supply is to provide working power for the IC of complete machine.

2. the keying LED light modulating device of a kind of practicality according to claim 1, is characterized in that: change with the PWM that button S1 and S2 port can control single chip computer outputs.

3. the keying LED light modulating device of a kind of practicality according to claim 1, it is characterized in that: with the pwm control signal of single-chip microcomputer output, go to control LED driving power and offer the operating current size of LED light source by level shifting circuit (if required).