CN1841449A - Drive device for cluster lamp lighting - Google Patents

Abstract

A driving device for cluster light beams uses a controller to receive video data transmitted by a control system, and divides the video data into three sub-video data, which are simultaneously and repeatedly output to a digital/analog converter at each fixed time. The digital/analog converter converts the three sub-video data into three analog voltages, and then outputs them to a voltage-current converter. The voltage-current converter converts the three analog voltages into three analog current outputs to drive and change the light-emitting components to emit light, thereby achieving a driving mode of voltage input and current output. The driving device drives the cluster light beam composed of multiple light-emitting diodes, so that the brightness is generated due to the change of the current, and then cooperates with the control system to produce a variety of color and pattern changes.

Description

Drive device for cluster lamp lighting

technical field

The invention relates to a driving device for driving a cluster lamp composed of a plurality of light-emitting diodes to light beams to emit light.

Background technique

Light Emitting Diode (LED) is a light-emitting component made of semiconductor materials. The component has two electrode terminals. A voltage is applied between the terminals and a very small current is passed through. Through the combination of internal electrons and holes, the The remaining energy is stimulated and released in the form of light, which is the basic light-emitting principle of light-emitting diodes (LEDs).

Different from ordinary incandescent light bulbs, light-emitting diodes (LEDs) are cold-emitting, which have the advantages of low power consumption, long component life, no need to warm up the lamp, and fast response speed. In addition, they are small in size, resistant to vibration and suitable for mass production, and It is easy to make extremely small or array components according to the application requirements. At present, light-emitting diodes (LEDs) have been widely used in indicators and display devices of information communication and consumer electronics products, and have become an indispensable and important component in daily life.

Light-emitting diode LEDs are mainly used in traffic signs, vehicle indicator lights, brake lights, etc.; full-color light-emitting diode LEDs are display screens composed of red, green, and blue primary color light diodes, and are widely used in stadium billboards and street advertisements. Kanban etc. Since the popularity of mobile phones or other portable electronic products, light-emitting diodes (LEDs) have become an indispensable light-emitting device. Due to the advantages of small size, fast lighting speed, and long life, light-emitting diodes (LEDs) will be able to replace part of the lighting in the future. light source.

Since the application of light-emitting diodes (LEDs) has gained popularity, various driving circuits and driving chips have emerged as the times require. Please refer to FIG. 1 , which is a schematic diagram of the voltage and current characteristics of a general diode. Except for some specific uses, diodes generally operate under forward voltage, and the relationship between voltage and current is described by the index e. When the voltage across the two poles of the diode exceeds a certain voltage Vf (generally called the activation voltage or conduction voltage, its value is between 0.5 and 0.8 volts, and this value is different depending on the material of the diode and the doping concentration of impurities). , the current of the diode increases rapidly, and before the activation voltage, the conduction current of the diode is extremely small. The characteristics of the light-emitting diode are the same as those of the general diode. As its name says, it can emit visible light when it is excited.

Light-emitting diodes (LEDs) are usually made of gallium arsenic phosphide or gallium phosphide. When the materials used for manufacturing are different, the wavelengths of the emitted light are also different, and the colors are naturally different. For example, the light emitted by gallium arsenic phosphide is red, while gallium phosphide is between yellow and green. The luminosity (lumen) emitted by a light-emitting diode is proportional to the conduction current, as shown in Figure 2, which is a schematic diagram of the relationship between the luminosity (lumen) and the forward conduction current of a general light-emitting diode. Therefore, in order to maintain a certain brightness driving circuit in practical applications, most of them are designed to be driven by a fixed current, which also prolongs the service life of the light-emitting diode LED.

Contents of the invention

The main purpose of the driving device of the present invention is to use the mode of voltage input and current output to drive a cluster lamp composed of a plurality of light-emitting diodes to light a beam, so that the brightness can be generated due to the change of the current. At the same time, in conjunction with the control system, multiple driving devices can be used to separately drive multiple cluster lamps to light beams, so as to produce various changes in colors and patterns.

According to the video data transmitted by the control system, the driving device of the present invention is used to drive a plurality of light-emitting components in a cluster lamp to emit light. The driving device uses a controller to receive the video data and divide the video data into three sub-video data, And repeatedly output three sub-video data to a digital/analog converter every fixed time. The digital/analog converter converts the three sub-video data into three analog voltages output to a voltage-to-current converter. The voltage-to-current converter converts the three analog voltages into three analog current outputs to drive and change the light emitting component to emit light.

The above summary and the following detailed description are all exemplary, and are intended to further illustrate the protection scope of the claims of the present invention. Other purposes and advantages of the present invention will be described in the subsequent description and accompanying drawings.

Description of drawings:

Figure 1 is a schematic diagram of the voltage and current characteristics of a general diode;

Fig. 2 is a schematic diagram of the relationship waveform between luminosity (lumen) and conduction current of a general light-emitting diode;

Fig. 3 is a schematic block diagram of a drive device circuit for lighting a cluster lamp according to the present invention;

Fig. 4 is a schematic block diagram of a controller circuit used in the present invention;

Fig. 5 is a schematic block diagram of a digital/analog converter circuit used in the present invention;

FIG. 6 is a schematic circuit block diagram of a voltage-to-current converter of the present invention.

Explanation of reference signs:

10 controller

102 external serial interface

104 serial/parallel conversion unit

106 data latch unit

108 parallel/serial conversion units

20 Digital/Analog Converter

202 serial/parallel conversion unit

204 conversion circuit

206 output buffer unit

30 voltage current converter

302 gain control unit

304 current drive unit

40 luminous components

402 LEDs

V _LED fixed driving voltage

Detailed ways

Please refer to FIG. 3 , which is a circuit block diagram of a driving device for lighting a cluster lamp according to the present invention. In this embodiment of the present invention, three light emitting components 40 are driven for illustration. The driving device is used to drive three light-emitting assemblies 40 in a spotlight 4 according to a video data, including: a controller 10 for receiving video data and dividing the video data into three sub-video data outputs; Connected to the controller 10, and convert the three sub-video data into digital/analog converters 20 that output three analog voltages; three voltage-current converters 30 are respectively connected to the digital/analog converters 20 and the The spotlight 4 of the cluster lamp converts the three analog voltages into three analog current outputs to drive the light-emitting component 40 to emit light.

Wherein, the controller 10 repeatedly transmits the three sub-video data to the digital/analog converter 20 every fixed time, so as to change the light emission of the light emitting component 40 . The light-emitting component 40 can be composed of at least one light-emitting diode LED connected, and the cluster lamp lighting 4 described above is composed of at least one series-connected red light-emitting diode, at least one series-connected green light-emitting diode and at least one series-connected The blue light-emitting diodes are connected in parallel, and the voltage-to-current converter 30 is a transconductance amplifier.

In conjunction with FIG. 3 , please refer to FIG. 4 , which is a schematic block diagram of a controller circuit used in the present invention. The controller 10 uses an external serial interface 102 in a serial data transmission mode to receive video data transmitted by a control system (not shown in the figure). The video data will be divided into three sub-video data (responsive to red, green, blue and other three primary colors for matching and dimming) output by a serial/parallel conversion unit 104 connected to the external serial interface 102 . The three data latch units 106 are connected to the serial/parallel conversion unit 104 to receive and lock the three sub-video data respectively. A parallel/serial conversion unit 108 is connected to the three data latch units 106 to convert the three locked sub-video data into serial data for output. At the same time, the parallel/serial conversion unit 108 provides a scanning function to repeatedly send out the sub-video data on the data latch unit 106 within a fixed time. The invention adopts the mode of serial data transmission, which can reduce the source of electromagnetic interference and reduce the failure rate.

In conjunction with FIG. 3 , please refer to FIG. 5 , which is a schematic block diagram of a digital/analog converter circuit used in the present invention. The digital/analog converter 20 includes a serial/parallel conversion unit 202 connected to the controller 10 to obtain a serial sub-video data output from the controller 10 and convert it into parallel data for output. Meanwhile, the digital/analog converter 20 uses a conversion circuit 204 connected to the serial/parallel conversion unit 202 to receive the parallel sub-video data and convert it into an analog voltage output.

As described above, the digital/analog converter 20 further includes an output buffer unit 206 connected to the conversion circuit 204 as a buffered output of the analog voltage. Please refer to FIG. 6 , which is a schematic circuit block diagram of the voltage-to-current converter of the present invention. The voltage-to-current converter 30 includes a current driving unit 304 connected in feedback to a gain control unit 302 , and the feedback network can reduce the influence of the gain difference of the current driving unit 304 . The gain control unit 302 is connected to the output buffer unit 206 of the digital/analog converter 20 to amplify and output the analog voltage. The amplified analog voltage is sent to the current driving unit 304 for proportional analog current output. The analog current can be used to drive the light emitting diode 402 in the light emitting component light 40 . The brightness of the LED 402 is controlled by the analog current output from the voltage-to-current converter 30 and a fixed driving voltage V _LED .

As described above, the present invention uses voltage input and current output to drive a cluster lamp composed of multiple light-emitting diodes, so that it can produce different brightness due to changes in current. With the control system, multiple driving devices can It is used to separately drive multiple cluster lights to light beams to produce a variety of color and pattern changes.

Furthermore, the drive device of the present invention uses a controller to receive video data, divide the video data into a plurality of sub-video data, and repeatedly output to a digital/analog converter every fixed time. The digital/analog converter converts the sub-video data into a plurality of analog voltages and outputs them to a voltage-to-current converter. The voltage-to-current converter converts the analog voltage into a plurality of analog current outputs, and drives and changes the light emitting components to emit light respectively, and then achieves voltage input and current output to drive a cluster lamp composed of a plurality of light-emitting diodes to light a beam.

To sum up, the present invention fully meets the conditions for patent application, so the application is filed in accordance with the Patent Law. Please review it in detail and grant the patent as soon as possible to protect the rights and interests of the inventor. If the examiner has any questions, please feel free to write to us for instructions .

However, the above is only a detailed description and accompanying drawings as the best specific embodiment of the present invention, and the features of the present invention are not limited thereto, and it is not intended to limit the present invention, and the entire scope of the present invention shall be As defined by the claims, all embodiments that conform to the spirit of the claims of the present invention and their similar changes should be included in the scope of the present invention, and any person familiar with the technology in the field of the present invention can Any changes or modifications that can easily be thought of can be covered within the patent scope of this case.

Claims (7)

1. A driving device for spotlighting of a cluster lamp, which drives a plurality of light-emitting components in a spotlight of a spotlight according to a video data, including: A controller receives the video data, and divides the video data into a plurality of sub-video data for output; A digital/analog converter, connected to the controller, converts the sub-video data into a plurality of analog voltage outputs; A voltage-to-current converter, connected to the digital/analog converter and the cluster lamp, is to convert the analog voltage into a plurality of analog current outputs to drive the light-emitting component to emit light; Wherein, the controller repeatedly transmits the sub-video data to the digital/analog converter every fixed time, so as to change the light emission of the light emitting component. 2. The driving device for spotting a cluster lamp according to claim 1, characterized in that, the light-emitting assembly can be composed of at least one light-emitting diode connected. 3. The drive device for spotlighting of cluster lamps according to claim 1, wherein the spotting of the cluster lamps is composed of at least one red light-emitting diode connected in series, at least one green light-emitting diode connected in series and at least one The blue light-emitting diodes connected in series are connected in parallel. 4. The driving device for spotlighting of cluster lamps according to claim 1, wherein the controller includes: An external serial interface is used to receive the video data in a serial data transmission mode; A serial/parallel conversion unit, connected to the external serial interface, is to divide the video data into a plurality of sub-video data; A plurality of data latch units, connected to the serial/parallel conversion unit, respectively receive and lock the sub-video data; and A parallel/serial conversion unit, connected to the data latch unit, converts the locked sub-video data into serial data for output. 5. The driving device for spotting beams of cluster lamps according to claim 1, wherein the digital/analog converter includes: A plurality of serial/parallel conversion units, connected to the controller, respectively convert the sub-video data into parallel data for output; and A plurality of conversion circuits are respectively connected to the serial/parallel conversion unit to convert the parallel sub-video data into the analog voltage output. 6 . The driving device for spotting the cluster lamps according to claim 5 , further comprising a plurality of output buffer units respectively connected to the conversion circuit as buffered outputs of the analog voltage. 7 . 7. The driving device for spotting a cluster lamp according to claim 1, wherein the voltage-to-current converter is a transconductance amplifier.

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