CN101193474A - Lighting device and brightness switching device thereof - Google Patents

Abstract

The invention discloses a lighting device and a brightness switching device thereof, which are used for controlling the brightness of a plurality of light emitting states emitted by an LED light source consisting of at least one light emitting diode, wherein the brightness switching device comprises a switching switch which is electrically connected with the brightness switching device and is used for switching the light emitting states of the LED light source, and the switching switch is provided with a plurality of switching modes corresponding to the light emitting states; a detection circuit for detecting the switching mode corresponding to the switch; the memory unit is used for storing the brightness value of the LED light source corresponding to the switching mode detected by the detection circuit, converting the brightness value of the LED light source into a brightness control signal and transmitting the brightness control signal to the detection circuit; and a power supply conversion circuit for receiving the brightness control signal transmitted by the detection circuit to make the LED light source emit brightness corresponding to the light-emitting state in the switching mode.

Description

Lighting device and brightness switching device thereof

technical field

The invention relates to a lighting device and its brightness switching device, in particular to a brightness switching device with a built-in memory unit for multi-stage switching of various lighting devices.

Background technique

Light Emitting Diodes (LEDs) have been widely used in daily life in recent years, such as displays, home appliances, automotive electronic components, and lighting fixtures. Taking household lighting fixtures as an example, traditional household lighting fixtures usually have multiple bulbs. When the user wants to change the brightness of the environment, a switch will be used to switch multiple bulbs sequentially according to the set value to turn them off. , for example, when the switch is first turned on, all the light bulbs are on; when the switch is turned off and then turned on, at least one light bulb will be turned off, resulting in a decrease in the brightness of the light emitted by the lighting fixture as a whole; When the switching switch is turned off and then turned on again, there will be at least one light bulb that was in the on state in the previous state, and it will be in the off state at this time, so that the purpose of multi-stage switching brightness of the lighting fixture can be achieved. However, if the light bulbs of the lighting fixtures are replaced by light-emitting diodes, due to the large number of light-emitting diode units required by the bulbs, if the light-emitting diodes of the lighting fixtures are turned off sequentially according to the above-mentioned operation method, the brightness of the light emitted by the overall lighting fixtures will be reduced. uneven.

In order to solve the problem of uneven light brightness of the above-mentioned devices using LEDs as light sources, US Patent Publication No. U.S. 6,344,641 discloses a control method for a display system using LEDs as light sources, see FIG. 1 . FIG. 1 is a schematic diagram of a conventional display system. As shown in FIG. 1 , a prior art display system 10 includes two light emitting diodes 12A, 12B, a display device, and a brightness detection control circuit 20 disposed in the display device. The display device includes an image display array 18 for displaying images of the display device. In addition, the display device further includes a controller 22 electrically connected to the brightness detection control circuit 20 to transmit timing and control signals to the brightness detection control circuit 20. Two photo-detectors (photo-detectors) 16A, 16B are arranged between the image display array 18 and the brightness detection control circuit 20. The corresponding sides of the LEDs 12A, 12B are electrically connected to the brightness detection control circuit 20 to respectively detect the brightness of the light emitted by the LEDs 12A, 12B.

When the photodetectors 16A, 16B respectively detect the brightness of the light emitted by the light emitting diodes 12A, 12B, they will convert the measured brightness of the light into a current signal and transmit it to the brightness detection control circuit 20. At this time, if you want to adjust the brightness of the light The brightness of the diodes 12A, 12B, the controller 22 will output a modulation signal to the brightness detection control circuit 20 according to the needs of the user, and then the brightness detection control circuit 20 integrates the light detectors 16A, 16B and the controller 22 Incoming signal, and send out a voltage signal to adjust the luminous brightness of LEDs 12A, 12B respectively, so that the brightness control of the light emitted by LEDs 12A, 12B of the display device can be achieved.

However, although the brightness detection control circuit 20 can control the brightness of the light emitted by the light emitting diodes 12A, 12B respectively, it can only do it for the insufficient brightness of the light emitting diodes 12A, 12B detected by the light detectors 16A, 16B or to adjust the brightness. Compensation, if the user wants to adjust the brightness of the light emitted by the light emitting diodes 12A, 12B to the brightness of different states, so that the display device can present different brightness according to the light emitting diodes 12A, 12B, the photodetectors 16A, 16B will be affected The influence of the light emitted by the adjacent LEDs 12A and 12B, such as the photodetector 16A will also detect the light emitted by the LED 12B, so it is impossible to control the LEDs 12A and 12B to achieve the purpose of emitting light with different brightness. In addition, when the display When a large number of LEDs are used in the device, the brightness detection control circuit 20 cannot control the lights of different brightnesses emitted by the LEDs in a specific state to the specific state again without causing the problem of uneven brightness.

Contents of the invention

The technical problem to be solved by the present invention is to provide a lighting device and a brightness switching device thereof, which are used to switch the brightness of multiple lighting states emitted by an LED light source composed of at least one light-emitting diode (LED), so as to solve the problem of lighting in the prior art. uneven problem.

To achieve the above object, the present invention provides a brightness switching device comprising a switch electrically connected to the brightness switching device for switching the light emitting state of the light emitting diode, wherein the switch has a plurality of switching modes corresponding to the light emitting state; The detection circuit is electrically connected to the switch to detect the switching mode of the switch; a memory unit is electrically connected to the detection circuit to store the brightness value of the light-emitting diode corresponding to the switching mode of the switch detected by the detection circuit, and Convert the brightness value of the light emitting diode into a brightness control signal and send it to the detection circuit; and a power conversion circuit, electrically connected to the LED light source, to receive the brightness control signal from the detection circuit, so that the light emitting diode emits a corresponding switching mode The brightness of the luminous state.

Moreover, the present invention further provides a lighting device, which includes an LED light source, which is composed of at least one light-emitting diode (LED), and the LED light source has multiple light-emitting states; a switch is used to switch the light-emitting state of the LED light source, The switch has a plurality of switching modes corresponding to the light-emitting state; a detection circuit is electrically connected to the switch to detect the switching mode of the switch; a memory unit is electrically connected to the detection circuit to store the detection circuit. switch the brightness value of the light-emitting diode of the LED light source corresponding to the switching mode of the switch, and convert the brightness value of the light-emitting diode into a brightness control signal and send it to the detection circuit; and a power conversion circuit, electrically connected to the LED light source, for receiving detection The brightness control signal sent by the circuit enables the light-emitting diode to emit the brightness corresponding to the light-emitting state in the switching mode.

The lighting device and its brightness switching device of the present invention have a built-in memory unit, which can store the brightness value of the light emitted by each light-emitting diode in each setting state, so that the light-emitting diodes can be turned on each time the switch is switched. Present the brightness value of the light that should be emitted, without the phenomenon of uneven light due to the influence of the light emitted by the adjacent light-emitting diodes, so that the LED light source can be provided for multi-stage brightness switching.

The above descriptions about the contents of the present invention and the following descriptions of the embodiments are used to demonstrate and explain the principles of the present invention, and provide further explanations of the claims of the present invention.

Regarding the features and implementation of the present invention, the preferred embodiments are described in detail below in conjunction with the drawings.

Description of drawings

Fig. 1 is a schematic diagram of an existing display system;

2A is a functional block diagram of the lighting device and its brightness switching device of the present invention;

Figure 2B is a simplified circuit diagram of the detection circuit in Figure 2A; and

Fig. 3 shows a schematic diagram of another embodiment of the LED light source of the present invention.

Among them, reference signs:

10: Display system 12A, 12B, 120: Light-emitting diodes

16A, 16B: photodetector 18: image display array

20: Brightness detection control circuit 22: Controller

60: Detection circuit 62: Amplifier

64: Analog/digital conversion circuit 70: Memory unit

90: Power conversion circuit 100: Brightness switching device

102: Signal feed-in terminal 110: LED light source

114: Brightness control signal 130: Switch

140: DC power supply 150: External power supply

Detailed ways

Refer to Figure 2A. FIG. 2A is a functional block diagram of the lighting device and its brightness switching device of the present invention. As shown in FIG. 2A , the lighting device of the present invention includes an LED light source 110 and a brightness switching device 100 . The LED light source is composed of at least one light emitting diode (Light Emitting Diode; LED) 120, and the brightness switching device 100 is used for switching the brightness of multiple light emitting states emitted by each light emitting diode 120 in the LED light source 110. The brightness switching device 100 includes a switch 130 , a detection circuit 60 , a memory unit 70 and a power conversion circuit 90 . In addition, the light emitting diodes 120 of the LED light source 110 can be arranged in series, in parallel or in series and parallel to form a special pattern arrangement.

The switch 130 is electrically connected to the detection circuit 60 of the brightness switching device 100, and is used to switch multiple light emitting states emitted by the light emitting diode 120 of the LED light source 110, and the switch 130 has multiple switching modes corresponding to these light emitting states .

The detection circuit 60 is electrically connected to the switch 130 for detecting the switching mode corresponding to the switch 130 . The memory unit 70 is electrically connected to the detection circuit 60, and is used to store the brightness value of the light emitted by each light-emitting diode 120 corresponding to the switch 130 detected by the detection circuit 60 in a certain switching mode, and to store the brightness value of each light-emitting diode 120. The brightness values of the light are converted into brightness control signals respectively.

In this embodiment, the power conversion circuit 90 is an AC/DC converter circuit (AC/DC Converter), which is electrically connected between the detection circuit 60 and the LED light source 110, and is used to convert the brightness control signal sent by the detection circuit 60 to It is transmitted to the LED light source 110 , and the AC power input by the external power source 150 into the light source brightness switching device 100 is converted into a DC power that can be received and used by the light source brightness switching device 100 and the LED light source 110 . In addition, the power conversion circuit 90 of the present invention can also be a DC/DC converter circuit (DC/DC Converter), and the external power source 150 at this time is a DC power source to provide the light source brightness switching device 100 and the LED light source 110 for use.

Refer to Figure 2B. FIG. 2B is a simplified circuit diagram of the detection circuit 60 in FIG. 2A. As shown in FIG. 2B , the detection circuit 60 of the present invention includes an amplifier 62 and an analog/digital (Analog/Digital) conversion circuit 64 . The positive input terminal of the amplifier 62 is used to receive the brightness signal of each LED 120 in the LED light source 110 , such as a current signal, and the negative input terminal of the amplifier 62 is electrically connected to the switch 120 . The analog/digital conversion circuit 64 is electrically connected to the amplifier 62 and the memory unit 70, and is used to convert the analog control signal transmitted from the amplifier 62 and the memory unit 70 into a digital control signal, and then transmit it to the power conversion circuit 90, and then through the power conversion The circuit 90 converts it into a brightness control signal to control the brightness of light emitted by each LED 120 in the LED light source 110 .

Through the light source brightness switching device 100 of the present invention, the brightness value of the light to be emitted by each light emitting diode 120 in the LED light source 110 can be accurately adjusted, and its operation principle is as follows. Please refer to FIG. 2A and FIG. 2B together. As shown in FIG. 2A and FIG. 2B, when the switch 130 is not activated (Off), the brightness switching device 100 will detect the brightness of the light emitted by each light emitting diode 120 in the LED light source 110 and use a brightness signal 112 from the brightness. A signal feeding end 102 of the switching device 100 is input to the positive input end of the detection circuit 60, and the brightness signal 112 can be a current signal, which carries the brightness value of the light emitted by each light emitting diode 120 in the LED light source 110. The amplifier 62 of the detection circuit 60 amplifies the brightness signal 112, and then converts it into a digital signal by the analog/digital conversion circuit 64 and transmits it to the memory unit 70. At this time, the memory unit 70 can store the brightness of the light emitted by each LED 120 state; when the switch 130 is turned on, the multiple light emitting diodes 120 in the LED light source 110 will present the same or different brightness states according to an original setting state (assuming that each light emitting diode 120 is in a fully bright state and the brightness of the emitted light is uniform. equal), and store the brightness value of the light emitted by each light emitting diode 120 through the memory unit, the memory unit 70 will convert the stored brightness state of the light emitting diode 120 into an analog signal through a conversion interface (not shown) and then send it to the analog signal. /digital conversion circuit 64, and then transmit the control signal to the power conversion circuit 90 of the brightness value of the light emitted by each light-emitting diode 120 to the power conversion circuit 90, so as to convert the control signal into the brightness control that the LED light source 110 can receive signal 114 so that each LED 120 exhibits a predetermined light brightness value. The brightness control signal 114 mentioned above can be a pulse width modulation (Pulse Width Modulation; PWM) signal, a voltage control signal, or a current control signal.

When the switch 130 is turned off first and then turned on again, at this time, the brightness switching device 100 will control the brightness value of the light emitted by each LED 120 according to the original setting state. The light brightness of the diode 120 will be weakened, and the picture presented by the overall LED light source 110 will present different visual effects due to the light-emitting diode 120 changing the brightness, because the memory unit 70 of the present invention can store According to the different brightness values of the light emitting diodes 120 to be presented according to the original setting, the brightness value of each light emitting diode 120 in the LED light source 110 can be controlled without being affected by the light emitted by the adjacent light emitting diodes 120. uneven phenomenon.

Refer to Figure 3. FIG. 3 shows a schematic diagram of another embodiment of the LED light source 110 of the present invention. As shown in FIG. 3 , in this embodiment, the LED light source 110 is externally connected with a DC power source 140 to directly serve as the power source for the light-emitting diode 120 .

The switch 130 of the present invention can be a common switch, which can provide an external trigger signal to the brightness switching device 100 through artificial switching action, and the above-mentioned external trigger signal can be a continuous pressing signal, and the user can continue to Press the switching switch 130 by hand, as the user presses the switching switch for a longer time, the brightness of the LED 120 of the LED light source 110 in this continuous switching mode also increases or decreases accordingly. In addition, the above-mentioned external trigger signal can also be a multi-stage pressing signal. The user can divide the switch 130 into multiple switching modes at a preset time interval. When the user continues to press the switch 130 with his hands, the As the time for the user to press the switching switch increases, the brightness of the light emitting diode 120 of the LED light source 110 in this continuous switching mode will also show a multi-stage increasing or multi-stage decreasing phenomenon. In addition, the above-mentioned external trigger signal can also be a multi-stage switching signal. The user can define the switching times of the switch 130 as multiple switching modes. When the user continues to switch the switching switch 130 by hand, as the user As the times of switching the switch 130 increase, the brightness of the light emitting diode 120 of the LED light source 110 in this switching mode will also show a multi-stage increasing or multi-stage decreasing phenomenon. In addition, the switch 130 can also be a programmable circuit used with a computer to perform multi-stage switching of the light emitting diodes 120 of the LED light source.

It should be noted that the brightness switching device 100 of the present invention can not only be applied to general LED display devices, but also can be applied to multi-stage lighting fixtures, color-changing decorative lights, and color-changing lighting fixtures. The LED light source can be assembled and matched with light-emitting diodes of different colors (R, G and B).

Compared with the prior art, the lighting device and its brightness switching device 100 of the present invention have a built-in memory unit, which can store the brightness value of the light emitted by each LED in each preset switching mode of the switch 130, Therefore, each time the switch is switched, the light emitting diodes can show the brightness value of the light that should be emitted, and there will be no uneven light due to the influence of light emitted by adjacent light emitting diodes 120 .

Certainly, the present invention also can have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these Corresponding changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (32)

1. A lighting device, characterized in that it comprises: A light-emitting diode light source, which is composed of at least one light-emitting diode, and the light-emitting diode light source has a plurality of light-emitting states; A switch, used to switch the light-emitting state of the light-emitting diode light source, the switch has a plurality of switching modes corresponding to the light-emitting state; A detection circuit, electrically connected to the switch, for detecting the switching mode of the switch; A memory unit, electrically connected to the detection circuit, used to store the luminance value of the light-emitting diode of the light-emitting diode light source corresponding to the switching mode of the switch detected by the detection circuit, and convert the luminance value of the light-emitting diode sending the brightness control signal to the detection circuit; and A power conversion circuit, electrically connected with the LED light source, is used to receive the brightness control signal from the detection circuit, so that the LED emits a brightness corresponding to the light-emitting state in the switching mode. 2 . The lighting device according to claim 1 , wherein the brightness of light emitted by at least one LED of the LED light source is different in different switching modes of the switching switch. 3 . 3 . The lighting device according to claim 1 , further comprising an external power supply, which can be switched by the switching switch to provide the lighting device. 4 . 4. The lighting device according to claim 1, further comprising a DC power supply electrically connected to the LED light source for use by the LED light source. 5. The lighting device according to claim 1, wherein the detection circuit comprises: an amplifier having a forward input terminal for receiving the light-emitting state of the light-emitting diode light source, and an inverse an input terminal is electrically connected to the switch to receive the switching pattern of the switch; and An analog/digital conversion circuit, electrically connected to the amplifier and the memory unit, is used to convert the analog control signal from the amplifier and the memory unit into a digital signal. 6 . The lighting device according to claim 2 , wherein the switching switch can execute the switching mode of the LED light source through an external trigger signal. 7 . 7 . The lighting device according to claim 6 , wherein the external trigger signal is a continuous pressing signal, and the brightness value of the LED of the LED light source is proportional or inversely proportional to the time of pressing the switch. 8. The lighting device according to claim 6, wherein the external trigger signal is a multi-stage switching signal, and the brightness value of the light-emitting diode of the light-emitting diode light source is multi-stage with the number of times the switch is switched. Increment or multi-stage decrement. 9. The lighting device according to claim 6, wherein the external trigger signal is a multi-segment pressing signal, and there is a preset time interval between each switching mode, and the light emitting diode of the light emitting diode light source The brightness value increases or decreases in multiple stages along with the time of pressing the toggle switch. 10. The lighting device according to claim 6, further comprising a signal input terminal for receiving the external trigger signal. 11. The lighting device according to claim 1, wherein the switch is a programmable circuit. 12. The lighting device according to claim 1, wherein the power conversion circuit is an AC/DC conversion circuit. 13. The lighting device according to claim 1, wherein the power conversion circuit is a DC/DC conversion circuit. 14. The lighting device according to claim 1, wherein the brightness control signal output by the power conversion circuit is a pulse width modulation signal. 15. The lighting device according to claim 1, wherein the brightness control signal output by the power conversion circuit is a voltage signal. 16. The lighting device according to claim 1, wherein the brightness control signal output by the power conversion circuit is a current signal. 17. A brightness switching device, used to switch the brightness of a plurality of light emitting states emitted by an LED light source composed of at least one light emitting diode, characterized in that the brightness switching device includes: a switch, electrically connected to the brightness switching device, for switching the light-emitting state of the light-emitting diode, wherein the switch has a plurality of switching modes corresponding to the light-emitting state; A detection circuit, electrically connected with the switch, for detecting the switching mode of the switch; a memory unit, electrically connected with the detection circuit, for storing the corresponding switching mode of the switch detected by the detection circuit the brightness value of the light emitting diode, and convert the brightness value of the light emitting diode into a brightness control signal and send it to the detection circuit; and A power conversion circuit, electrically connected with the LED light source, is used to receive the brightness control signal from the detection circuit, so that the LED emits a brightness corresponding to the light-emitting state in the switching mode. 18 . The brightness switching device according to claim 17 , wherein the brightness of light emitted by at least one LED of the LED light source is different in different switching modes of the switching switch. 19. The brightness switching device according to claim 17, further comprising an external power supply, which can be used by the brightness switching device through switching of the switching switch. 20. The brightness switching device according to claim 17, further comprising a DC power supply electrically connected to the LED light source for use by the LED light source. 21. The brightness switching device according to claim 17, wherein the detection circuit comprises: an amplifier, which has a positive input terminal for receiving the light-emitting state of the light-emitting diode light source, and an inverting input terminal electrically connected to the switching switch for receiving the switching mode of the switching switch; and An analog/digital conversion circuit, electrically connected to the amplifier and the memory unit, is used to convert the analog control signal from the amplifier and the memory unit into a digital signal. 22 . The brightness switching device according to claim 18 , wherein the switching switch can execute the switching mode of the LED light source through an external trigger signal. 23. The brightness switching device according to claim 22, wherein the external trigger signal is a continuous pressing signal, and the brightness value of the LED of the LED light source is directly proportional or inversely proportional to the time of pressing the switch. 24. The brightness switching device according to claim 22, wherein the external trigger signal is a multi-stage switching signal, and the brightness value of the light-emitting diode of the light-emitting diode light source becomes multi-stage according to the number of times the switch is switched. incremental or multi-stage decrement. 25. The brightness switching device according to claim 22, wherein the external trigger signal is a multi-stage pressing signal, and there is a preset time interval between each switching mode, and the LED of the LED light source The brightness value of the switch will increase or decrease in multiple stages with the time of pressing the switch. 26. The brightness switching device according to claim 22, further comprising a signal input terminal for receiving the external trigger signal. 27. The brightness switching device according to claim 17, wherein the switching switch is a programmable circuit. 28. The brightness switching device according to claim 17, wherein the power conversion circuit is an AC/DC conversion circuit. 29. The brightness switching device according to claim 17, wherein the power conversion circuit is a DC/DC conversion circuit. 30. The brightness switching device according to claim 17, wherein the brightness control signal output by the power conversion circuit is a pulse width modulation signal. 31. The brightness switching device according to claim 17, wherein the brightness control signal output by the power conversion circuit is a voltage signal. 32. The brightness switching device according to claim 17, wherein the brightness control signal output by the power conversion circuit is a current signal.

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