Title:
CURRENT CONTROL CIRCUIT AND METHOD, AND PROJECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/121300
Kind Code:
A1
Abstract:
Provided in the embodiments of the present application are a current control circuit and method, and a projection device. The current control circuit is applied to a projection device that comprises at least a light source and a color wheel. The circuit comprises a main power circuit for connecting to the light source; a discharge circuit connected to the main power circuit; and a control circuit connected to the main power circuit and the discharge circuit, wherein the control circuit is used for controlling, during the spoke time period of the color wheel and when the drive current of the light source needs to be switched from small to large, the main power circuit to pre-raise the voltage at both ends of the light source to a voltage value corresponding to a drive current required after switching, and is used for reducing, during the spoke time period of the color wheel and when the drive current of the light source needs to be switched from large to small, the voltage at both ends of the light source by means of the discharge circuit to a voltage value corresponding to a drive current required after switching. The current control circuit provided by the embodiments of the present application can realize fast and stable switching of any current of a light source.
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Inventors:
LIN YIMING (CN)
HUANG GUOSHENG (CN)
HUANG GUOSHENG (CN)
Application Number:
PCT/CN2020/137081
Publication Date:
June 24, 2021
Filing Date:
December 17, 2020
Export Citation:
Assignee:
APPOTRONICS CORP LTD (CN)
International Classes:
H05B47/10
Foreign References:
| CN103676427A | 2014-03-26 | |||
| CN109814323A | 2019-05-28 | |||
| CN110351541A | 2019-10-18 | |||
| CN108255001A | 2018-07-06 | |||
| CN104580960A | 2015-04-29 |
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