CN105392239A - Luminaire brightness control method and LED lamp with adjustable brightness - Google Patents

Abstract

The invention discloses a lamp brightness control method, which comprises the following steps: s1, starting to monitor the state of the power switch and start timing; s2, recording the duration T of the power switch from one state to the other state; s3, recording duration T and pre-recordingSetting value T₀Comparing the values of the two; s4, selecting to execute the following operations according to the comparison result: gradually increasing the brightness of the lamp until the brightness of the lamp is brightest; or gradually reducing the brightness of the lamp until the brightness of the lamp is darkest. By adopting the lamp brightness control method, the original power switch can be utilized to adjust the light of the lamp, the replacement or transformation of the accessories of the existing circuit is not needed, and a special remote controller, a special touch electrode, a special touch pad or a special knob board is not needed. Thereby the installation and the use are more convenient. The invention also discloses an LED lamp capable of adjusting the brightness through the common power switch.

Description

Luminaire brightness control method and LED lamp with adjustable brightness

technical field

The invention relates to a lighting fixture, in particular to a method for controlling the brightness of the lighting fixture and an LED lighting fixture with adjustable brightness.

Background technique

LED is currently the most widely used energy-saving light source in my country, which is advocated by the state. Due to the inherent characteristics of LEDs, it is not suitable to use constant voltage ignition, nor can it be used to adjust the driving voltage to adjust the light. LEDs can be dimmed by adjusting the magnitude of the driving current, but due to the technical structure characteristics of LEDs, adjusting the driving current of LEDs in a large range will cause a large change in the color of light emitted by LEDs.

In order to overcome the above problems, it is generally used to realize the dimming of LED by fast ignition-off and controlling the ignition/extinguishment ratio (duty cycle) on the basis of constant current drive.

There are many kinds of LED dimming available, but each has its own advantages and disadvantages:

Remote dimming: convenient, dimmable and color adjustable. But the price is more expensive, and it consumes power in standby after turning off the light, and requires a dedicated remote control.

Touch Dimming: Convenient, dimmable, and even has a display. But the price is more expensive and it also consumes power after turning off the lights, and there is no need for special touch electrodes or special touchpads.

Knob dimming: convenient, dimmable, and there is even a switch on the knob to avoid power consumption after turning off the light. But it is also more expensive and requires a dedicated knob plate.

Contents of the invention

One object of the present invention is to provide a method for controlling the brightness of a lamp through an ordinary power switch, and another object of the present invention is to provide an LED lamp whose brightness can be adjusted through an ordinary power switch.

According to one aspect of the present invention, a method for controlling brightness of a lamp is provided, comprising the following steps:

S1. Start monitoring the state of the power switch and start timing;

S2. Record the duration T of the power switch from one state until switching to another state;

S3. Comparing the recorded duration T with the preset value _T0 ;

S4. Select to perform the following operations according to the comparison result:

Gradually increase the brightness of the lamp until the brightness of the lamp is the brightest;

or,

Gradually reduce the brightness of the lamp until the brightness of the lamp is the dimmest.

Using the above lamp brightness control method can use the original power switch to dim the lamp, not only does not need to replace or modify the accessories of the existing circuit, but also does not need a special remote control, special touch electrodes, special touch panels or special Knob Board. It is thus more convenient to install and use. Moreover, the brightness control method of the lamp is used for dimming, and no power consumption will be consumed after the lamp is turned off.

In some embodiments, step S1 starts when the power switch is turned on to off, and step S2 records the time from when the power switch is turned off to on again, that is, the duration of the off state of the power switch. Therefore, the brightness control of the lamp is more convenient.

In some embodiments, step S4 includes:

S41. When T≤T ₀ , gradually increase the brightness of the lamp until the brightness of the lamp is the brightest;

S42. When T>T ₀ , gradually reduce the brightness of the lamp until the brightness of the lamp is the darkest.

Therefore, the brightness control of the lamp is more convenient.

In some embodiments, the following steps are also included:

S5. During the brightness adjustment process of the lamp, if it is detected that the power switch is disconnected, the relevant parameters corresponding to the brightness of the lamp when the power switch is disconnected are saved, and when the power switch is turned on next time, the saved relevant parameters are directly imported, so that The brightness of the lamp is the brightness of the lamp when the power switch was turned off last time. Thus, the lamp can be fixed at the corresponding brightness at any time during the process of adjusting the brightness of the lamp.

In some embodiments, step S1 also includes the following steps;

S11. When the recording duration T is greater than the sampling time upper limit T _max , stop timing. In this way, data redundancy caused by collecting the duration of the power switch state when the lamp is turned on or off for a long time can be avoided, and the collection of invalid data is avoided, thereby saving electric energy.

In some implementations, the adjustment of the brightness of the lamp in step S4 is realized by a graded dimming circuit or a stepless dimming circuit.

In some embodiments, the light fixture is an LED light fixture.

In some embodiments, the preset value T ₀ is 0.8 seconds-1.8 seconds, and the sampling time upper limit T _max is greater than or equal to 30 seconds. Therefore, it is more humane and more in line with the habits of most people.

In some embodiments, the initial luminous flux of the lamp is 5%-100%, the luminous flux of the brightest lamp is 100%, and the luminous flux of the dimmest brightness is 5%-20%. It can be used as a night light when the brightness of the lamp is at its dimmest. Therefore, using the method for controlling the brightness of the lamp to control the lamp can meet various luminous flux requirements in different occasions, and the application is more extensive.

According to one aspect of the present invention, there is provided an LED lamp with adjustable brightness, comprising:

LED light source;

The drive circuit is used to drive the LED light source to work. Both ends of the drive circuit are respectively connected to the mains and the LED light source, and a power switch is connected in series between the mains and the drive circuit;

The sampling timing circuit is connected with the power switch signal, and is used to monitor the state of the power switch, and record the duration T of the power switch from one state to another state;

Central processing circuit, including:

The comparison module is connected with the sampling timing circuit, and is used to compare the value of the recorded duration T with the preset value _T0 , and issue a dimming instruction according to the comparison result,

The dimming module is connected with the comparison module, the output terminal of the dimming module is connected with the driving circuit, and is used to receive the dimming instruction sent by the comparing module, and adjust the output power of the driving circuit according to the dimming instruction, thereby adjusting the brightness of the LED lamp.

The energy storage circuit is used to provide working current to the sampling timing circuit and the central processing circuit, the input end of the energy storage circuit is connected to the mains, and the output end of the energy storage circuit is respectively connected to the sampling timing circuit and the central processing circuit.

The brightness-adjustable LED lamp adopting the above technical scheme can use the original power switch to adjust the brightness of the lamp, not only does not need to replace or modify the accessories of the existing circuit, but also does not require a special remote control, a special touch electrode, Dedicated touchpad or dedicated knob pad. It is thus more convenient to install and use.

Description of drawings

Fig. 1 is a schematic circuit diagram of an LED lamp with adjustable brightness according to an embodiment of the present invention.

Fig. 2 is a control flow chart of the LED lamp with adjustable brightness.

FIG. 3 is a graph showing the change in luminous flux of the LED lamp with adjustable brightness shown in FIG. 1 .

Explanation of reference numerals in Fig. 1:

10. Power switch 20, LED light source 30, drive circuit 50, sampling timing circuit 60, energy storage circuit 70, central processing circuit

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings. The "power switch" mentioned in the embodiments refers to a commonly used power switch which has only two states of "on" and "off".

Example 1

1 to 3 schematically show an LED lamp with adjustable brightness according to an embodiment of the present invention.

As shown in FIG. 1 , the device includes an LED light source 20 , a drive circuit 30 , a sampling timing circuit 50 , an energy storage circuit 60 and a central processing circuit 70 .

Wherein, the driving circuit 30 is used to drive the LED light source 20 to work.

Both ends of the drive circuit 30 are respectively connected to the commercial power and the LED light source 20 .

A power switch 10 is connected in series between the commercial power and the drive circuit 30 .

The sampling timing circuit 50 is connected with the power switch 10 for monitoring the state of the power switch 10 and recording the duration T from one state to another state of the power switch 10 .

The central processing circuit 70 includes a comparison module and a dimming module.

Wherein, the comparison module is connected with the sampling timing circuit 50, and is used to compare the magnitude or value of the recorded duration T with the preset value _T0 , and issue a dimming instruction according to the comparison result,

The dimming module is connected to the comparison module, and the output end of the dimming module is connected to the driving circuit 30 for receiving the dimming instruction issued by the comparing module, and adjusting the output power of the driving circuit 30 according to the dimming instruction, thereby adjusting the brightness of the LED lamp 20. brightness.

In this embodiment, the dimming module includes a stepless dimming circuit. In another embodiment, the dimming module may also include a graded dimming circuit.

The energy storage circuit 60 is used to provide working current to the sampling timing circuit 50 and the central processing circuit 70 . The input end of the energy storage circuit 60 is connected to the mains, and the output end of the energy storage circuit 60 is respectively connected to the sampling timing circuit 50 and the central processing circuit 70 .

The central processing circuit 70 is usually integrated into a single-chip microcomputer, and realizes its effect of adjusting the brightness of the LED lamp through the single-chip microcomputer.

The working process of the single chip microcomputer:

1. Set the duty ratio output as the initial value when powering on and initializing, and choose between 5-100.

2. The critical value of the operation time of the combination state of "off-on" is stipulated, and it is set at 0.8-1.8 seconds according to the operation process of ordinary switches and people's operating habits.

3. Determine whether it is the "off-conduction" combination state whose duration is lower than the critical value or the "off-conduction" combination state whose duration is higher than the critical value.

4. The control program is set as follows: in the application of stepless dimming: do a combination state operation of "power-off-power-on" whose duration is lower than the critical value, and it is required to make it larger (or more smaller and smaller), until 100 (or 5), and fix it at the current brightness when the lamp is dimming; do an "off-on" combined state operation with a duration higher than the critical value, requiring that the output occupy the When the duty cycle remains constant, it becomes smaller (or larger) until 5 (or 100), and it is fixed at the current duty cycle when the lamp is dimming. In the application of step dimming: do a combined state operation of "power-off-power-on" whose duration is lower than the critical value, and the output duty cycle jumps to a larger (or smaller) level until 100 (or at most 5) ; Do an "off-on" combined state operation with a duration higher than the critical value, and the output duty cycle will jump to a smaller (or larger) level until it reaches 5 (or 100).

Duty cycle 5 is the night light mode; it is not only a function commonly used by people, but also avoids confusion with the switch being disconnected and power consumption in standby.

The duty ratio signal output by the microcontroller is input to the LED constant current driver IC with duty ratio input, and the constant current output according to the required duty ratio can be obtained. For the LED constant current driver IC without duty cycle input, we need to connect an electronic switch in series to the LED end of the drive power supply and use the duty cycle signal output by the microcontroller to control its on and off. A constant current output according to the required duty cycle can be obtained.

The brightness-adjustable LED lamp adopting the above technical scheme can use the original power switch to adjust the brightness of the lamp, not only does not need to replace or modify the accessories of the existing circuit, but also does not require a special remote control, a special touch electrode, Dedicated touchpad or dedicated knob pad. It is thus more convenient to install and use.

The control process of the brightness-adjustable LED lamp is shown in Figure 2, which mainly includes the following steps:

S1, the power switch turns from on to off, and the sampling timing circuit 50 starts to monitor the state of the power switch, and starts timing;

S11. When the recorded duration T is greater than the sampling time upper limit T _max , that is, when the power switch is not detected to be switched from off to on within the time range of T _max , give up timing; within the time range of T _max When it is detected that the power switch turns from off to on, proceed to S2;

S2. Record the duration T of the off state of the power switch;

S3. Comparing the recorded duration T with the preset value _T0 ;

S41. When T≤T ₀ , gradually increase the brightness of the lamp until the luminous flux of the lamp reaches 100%;

S42. When T>T ₀ , gradually reduce the brightness of the lamp until the luminous flux of the lamp reaches 10%.

S5. During the brightness adjustment process of lamps such as S41 or S42, if it is detected that the power switch is disconnected, the relevant parameters corresponding to the brightness of the lamp when the power switch is disconnected will be saved, and the saved relevant parameters will be directly imported when the power switch is turned on next time. parameter, so that the brightness of the lamp is the brightness of the lamp when the power switch was turned off last time.

In order to make the brightness control of lamps more humanized, it is more in line with the habits of most people. In this embodiment, the preset value T ₀ is 1 second, and the sampling time upper limit T _max is 30 seconds. In some other embodiments, the preset value T ₀ may also be 1.8 seconds, and the sampling time upper limit T _max may also be 50 seconds.

Using the above lamp brightness control method can use the original power switch to dim the lamp, not only does not need to replace or modify the accessories of the existing circuit, but also does not need a special remote control, special touch electrodes, special touch panels or special Knob Board. It is thus more convenient to install and use. Moreover, the brightness control method of the lamp is used for dimming, and no power consumption will be consumed after the lamp is turned off.

The luminous flux of the LED lamp with adjustable brightness in different states is shown in FIG. 3 .

In the figure, T _A =2 seconds, T _B =2 seconds, T _C =2 seconds, T _D =0.5 seconds, T _E =2 seconds, T _F =2 seconds,

T _G =0.5 sec, T _H =2 sec, T _I =0.5 sec, T _J =0.5 sec, T _K =0.5 sec, T _L =0.5 sec.

As shown in the figure, in the initial state, the luminous flux of the LED lamp is 80%.

T _A >T ₀ , and T _A is in the stage where the brightness of the LED lamp is stable, therefore, the brightness of the LED lamp gradually decreases when T _A ends.

T _B >T ₀ , but TB is in the stage where the brightness of LED lamps gradually decreases, so the brightness of LED lamps at the end of _TB is stable to the brightness at the beginning of _{T B.}

T _C >T ₀ , and T _C is in the stage where the brightness of the LED lamp is stable, so the brightness of the LED lamp continues to gradually decrease when T _C ends.

T _D < T ₀ , but T _D is in the stage where the brightness of LED lamps gradually decreases, so the brightness of LED lamps at the end of T _D is stable to the brightness at the beginning of T _D.

TE > _{T 0} , and TE is in the stage where the brightness of LED lamps is stable _. Therefore, at the end of _TE , the brightness of LED lamps continues to gradually decrease until the luminous flux of LED lamps decreases to 10%, and then stabilizes at the brightness of 10% of luminous flux.

_{T F} > _{T 0} , and TF is in the stage where the brightness of LED lamps is stable, but at this time the luminous flux of LED lamps has reached 10% of the minimum value and cannot continue to decrease. Therefore, at the end of TF, the LED lamps are stable at 10% of luminous flux brightness.

T _G < T ₀ , and T _G is in the stage where the brightness of the LED lamp is stable, so the brightness of the LED lamp increases gradually when T _G ends.

T _H > T ₀ , but T _H is in the stage where the brightness of LED lamps gradually increases, so the brightness of LED lamps at the end of T _H is stable to the brightness at the beginning of T _H.

T _I < T ₀ , and T _I is in a stage where the brightness of the LED lamp is stable, therefore, the brightness of the LED lamp continues to increase gradually at the end of T _I.

T _J < T ₀ , but T _J is in the stage where the brightness of LED lamps is gradually increasing, so the brightness of LED lamps at the end of T _J is stable to the brightness at the beginning of T _J.

T _K < T ₀ , and T _K is in the stage where the brightness of the LED lamp is stable, so the brightness of the LED lamp continues to gradually increase at the end of T _K until the luminous flux of the LED lamp increases to 100%, and then stabilizes at the brightness of 10% of the luminous flux .

T _L < T ₀ , and T _L is in the stage where the brightness of the LED lamp is stable, but at this time the luminous flux of the LED lamp has reached 100% of the highest value and cannot continue to increase. Therefore, at the end of T _L , the LED lamp is stable at 100% of the luminous flux brightness.

Finally, the power switch is turned off, and the power switch is not detected to be turned on within the sampling time upper limit T _max =30 seconds, the sampling timing circuit gives up timing, and the lamp is turned off.

In other embodiments, the lamps can also be adjusted in the following ways:

When T>T ₀ , gradually increase the brightness of the lamp until the luminous flux of the lamp reaches 100%;

When T≤T ₀ , gradually reduce the brightness of the lamp until the luminous flux of the lamp reaches 10%.

Example 2

Another LED lamp with adjustable brightness is different from Embodiment 1 in that the energy storage power supply can only work continuously for 30-50 seconds for the sampling timing circuit and the central processing circuit after the power switch is disconnected. Thus, when the power switch is turned off for longer than 30-50 seconds, the sampling timing circuit and the central processing circuit will also stop working due to lack of power, thereby avoiding collection of invalid data and saving electric energy.

What have been described above are only some embodiments of the present invention. For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims (10)

1. The lamp brightness control method is characterized by comprising the following steps:

s1, starting to monitor the state of the power switch and start timing;

s2, recording the duration T of the power switch from one state to the other state;

s3, recording the duration T and the preset value T₀Comparing the values of the two;

s4, selecting to execute the following operations according to the comparison result:

gradually increasing the brightness of the lamp until the brightness of the lamp is brightest;

or,

and gradually reducing the brightness of the lamp until the brightness of the lamp is darkest.

2. The method as claimed in claim 1, wherein the step S1 is started when the power switch is turned from on to off, and the step S2 records the time from off to re-on of the power switch, i.e. the duration of the off state of the power switch.

3. The luminaire brightness control method according to claim 1, wherein the step S4 comprises:

s41, when T is less than or equal to T₀Gradually increasing the brightness of the lamp until the brightness of the lamp is brightest;

s42, when T>T₀And gradually reducing the brightness of the lamp until the brightness of the lamp is darkest.

4. A luminaire brightness control method as claimed in any one of claims 1, 2 or 3, characterized by further comprising the steps of:

s5, in the process of adjusting the brightness of the lamp, if the power switch is detected to be switched off, storing the relevant parameters corresponding to the brightness of the lamp when the power switch is switched off, and directly importing the stored relevant parameters when the power switch is switched on next time, so that the brightness of the lamp is the brightness of the lamp when the power switch is switched off last time.

5. The luminaire brightness control method of claim 1, wherein the step S1 further comprises the steps of;

s11, when the recorded duration T is greater than the upper limit value T of the sampling time_maxWhen so, the timing is abandoned.

6. The method as claimed in any one of claims 1, 2 or 3, wherein the adjusting of the lamp brightness in step S4 is implemented by a step dimming circuit or a stepless dimming circuit.

7. The method for controlling the brightness of a lamp according to any one of claims 1, 2 or 3, wherein the lamp is an LED lamp.

8. The method of claim 5, wherein the preset value T is set as₀0.8-1.8 s, the upper limit value T of the sampling time_maxGreater than or equal to 30 seconds.

9. The method for controlling brightness of a lamp as claimed in claim 1, wherein the initial luminous flux of the lamp is 5% to 100%, the luminous flux is 100% when the brightness of the lamp is the brightest, and the luminous flux is 5% to 20% when the brightness of the lamp is the darkest.

10. LED lamps and lanterns of adjustable luminance characterized in that includes:

an LED light source;

the driving circuit is used for driving the LED light source to work, two ends of the driving circuit are respectively connected with a mains supply and the LED light source, and a power switch is connected between the mains supply and the driving circuit in series;

the sampling timing circuit is in signal connection with the power switch and is used for monitoring the state of the power switch and recording the duration T from one state to the other state of the power switch;

a central processing circuit, comprising:

a comparison module connected with the sampling timing circuit and used for comparing the recorded duration T with a preset value T₀Comparing the two numerical values, and sending out a dimming instruction according to the comparison result;

the output end of the dimming module is connected with the driving circuit and is used for receiving the dimming instruction sent by the comparison module and adjusting the output power of the driving circuit according to the dimming instruction so as to adjust the brightness of the LED lamp;

the energy storage circuit is used for providing working current for the sampling timing circuit and the central processing circuit, the input end of the energy storage circuit is connected with the mains supply, and the output end of the energy storage circuit is respectively connected with the sampling timing circuit and the central processing circuit.