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Projection device, light source system and method for digitally controlling current

A light source system and digital current control technology, applied in light sources, electric light sources, lighting devices, etc., can solve problems such as inaccurate current control of projectors, strong transmission interference, and color distortion

Active Publication Date: 2021-07-06
APPOTRONICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the light source of the projector, when the supply current is unstable, color distortion may occur
However, the current control of existing projectors is not very precise. For example, the method of using pulse width modulation to control the constant output current generally includes the following steps: the microcontroller generates a pulse width modulation signal, and then the constant current The driver end integrates into a voltage signal and then controls the setting current pin or feedback pin of the constant current driver chip to control the current
Generally, the integrated voltage signal will be affected by high-level voltage errors. In addition, the system control terminal and the power drive power supply in the existing projector are two independent components, and a long distance is usually used between them. Connecting with transmission lines will also cause strong transmission interference, so it will eventually lead to a constant current that is difficult to precisely control

Method used

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  • Projection device, light source system and method for digitally controlling current
  • Projection device, light source system and method for digitally controlling current
  • Projection device, light source system and method for digitally controlling current

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, it is a schematic structural diagram of the control end of the light source system provided by Embodiment 1 of the present invention, which includes the wavelength conversion device 10 , the light source module 22 and the control module 20 .

[0039] Wherein, the light source module 22 is used for emitting source light. The light source module 22 may include multiple light sources, and the light sources may be laser diodes or other optical devices with controllable brightness.

[0040] Preferably, the plurality of light sources can also be divided into several groups according to actual needs, so as to realize independent control.

[0041] The wavelength conversion device 10 is partly on the light path of the light source module 22, which includes at least one subsection, and the wavelength conversion device 10 moves periodically so that the at least one subsection is located on the optical path of the source light.

[0042] It can be unders...

Embodiment 2

[0059] figure 2 It is a schematic diagram of the connection between the control module and other components provided by Embodiment 2 of the present invention. exist figure 2 Among them, the control module 20 is connected to the system control terminal 21 and the light source module 22 respectively.

[0060] The light source module 22 is electrically connected with the control module 20, and is used for generating corresponding source light according to the constant current output by the control module 20, and projecting the source light onto the wavelength conversion device to generate stimulated light.

[0061] The control module 20 receives the digital current control information sent by the system control terminal 21, and converts the digital current control information into a voltage or current signal to control the input terminal of the power drive unit to finally control the constant output current.

[0062] The control module 20 includes a current information conver...

Embodiment 3

[0073] image 3 It is a flow chart of the method for controlling current at the control end of the light source system provided by Embodiment 3 of the present invention. The method includes the steps of:

[0074] Step S300, receiving digital current control information, and converting the digital current control information into a voltage or current signal;

[0075] Step S310, input the voltage or current signal into the power drive unit to control the input terminal of the power drive unit to finally control the constant output current.

[0076] Further, step S300 is to convert the digital current control information into a voltage or current signal in the following manner:

[0077] converting said digital current control information directly into a voltage or current signal; or

[0078] The digital current control information is converted into current digital information, and the current digital information is converted into a corresponding resistance value, and then conv...

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Abstract

The invention discloses a projection device, a light source system and a method for digitally controlling current. The method includes the steps of: receiving digital current control information, and converting the digital current control information into a voltage or current signal; converting the voltage or current signal The input power drive unit is used to control the input terminal of the power drive unit to finally control the constant output current. Due to the addition of a digital transmission circuit for converting digital signals into analog signals, the transmission distance between the system control terminal and the power drive unit of the light source power supply is indirectly shortened, thereby avoiding transmission interference; in addition, a power drive unit is provided on the power drive unit Reference voltage, thus further improving the accuracy of constant output current.

Description

technical field [0001] The invention relates to the technical field of light source control, and more specifically, to a projection device, a light source system and a method for digitally controlling current thereof. Background technique [0002] In today's projector market, mercury lamps are generally used as lighting sources because they have the advantages of low price and high brightness. With the rapid development of solid-state lighting, the choices of light sources available for projectors tend to be diversified, and light sources are one of them. The light source as the light source of the projector has the advantage of low energy consumption, but at the same time, it is expensive and the brightness is reduced, which is the weakness of the light source. Therefore, it is generally impossible to use different colors of laser diodes to produce different colors, which is the mainstream of the market. direction, usually a pure color laser diode is used as the light sour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20H05B45/345H05B44/00
CPCG03B21/204H05B45/37H05B47/10G03B21/14H05B45/397Y02B20/30
Inventor 黄国生李屹
Owner APPOTRONICS CORP LTD
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