Switching power supply capable of increasing response frequency
A technology of switching power supply and frequency response, applied in the field of power supply, can solve the problems of affecting the display effect of the panel, increasing the voltage ripple, and relatively large voltage fluctuation
Inactive Publication Date: 2017-01-25
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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Problems solved by technology
[0002] As the size of the panel becomes larger, the resolution is higher and the refresh rate is higher and higher, the load on the panel will become heavier, and the voltage provided in the power structure of the panel will change with the load. This makes the voltage ripple larger and affects the display effect of the panel. The boost architecture commonly used in VAA in the panel is a fixed frequency. When the load changes from light load to heavy load, the switching frequency of the IC internal transistor (MOS tube) is Fixed frequency, slow response to voltage changes, large voltage fluctuations, resulting in larger voltage ripples
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[0012] The inventive concepts will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the inventive concepts are shown. Advantages and features of the inventive concept and methods for realizing them will be apparent from the following exemplary embodiments which will be described in more detail with reference to the accompanying drawings. It should be noted, however, that the inventive concept is not limited to the following exemplary embodiments, and may be implemented in various forms. Therefore, the exemplary embodiments are provided only to disclose the inventive concepts and to let those skilled in the art understand the scope of the inventive concepts. In the drawings, embodiments of the inventive concept are not limited to the specific examples provided herein.
[0013] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the embodiments disclosed in the present...
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The invention provides a switching power supply capable of increasing response frequency. The switching power supply comprises a pulse modulation chip, a voltage input end, a voltage output end and a photocoupler connected with the voltage output end, wherein the pulse modulation chip comprises a comparison module, a boost controller and a frequency multiplier and is connected with the voltage input end; the photocoupler is connected with a detection end of the pulse modulation chip through a first resistor; the comparison module is used for sending a control signal to the frequency multiplier when judging that the voltage at the detection end is higher than reference voltage; the frequency multiplier is sued for sending a clock signal to the boost controller after receiving the control signal so as to increase the response frequency of the boost controller to the voltage output end.
Description
technical field [0001] The invention relates to the field of power supplies, in particular to a switching power supply with improved response frequency. Background technique [0002] As the size of the panel becomes larger, the resolution is higher and the refresh rate is higher and higher, the load on the panel will become heavier, and the voltage provided in the power structure of the panel will change with the load. This makes the voltage ripple larger and affects the display effect of the panel. The boost architecture commonly used in VAA in the panel is a fixed frequency. When the load changes from light load to heavy load, the switching frequency of the IC internal transistor (MOS tube) is With a fixed frequency, the response speed of the voltage change is slow, and the voltage will fluctuate greatly, resulting in a larger voltage ripple. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the present invention provides a switc...
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IPC IPC(8): H02M1/14
CPCH02M1/14
Inventor 李文芳曹丹
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD