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Filtering method for DC voltage output by switching power supply and filter device

A technology of DC voltage and switching power supply, which is applied in the field of power supply, can solve problems such as DC voltage ripple, and achieve the effects of high precision, good stability, and good circuit operation stability

Inactive Publication Date: 2011-01-12
SHENZHEN TCL NEW-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a switching power supply output DC voltage filtering method and filtering device, aiming at solving the ripple problem in the switching power supply output DC voltage

Method used

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  • Filtering method for DC voltage output by switching power supply and filter device
  • Filtering method for DC voltage output by switching power supply and filter device
  • Filtering method for DC voltage output by switching power supply and filter device

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] Such as figure 1 As shown, the filter device provided by the embodiment of the present invention includes a switch control unit, a comparator, and a sampling feedback unit, wherein the sampling feedback unit is connected to the output end of the switch control unit and the comparator, and is used to sample patterns from the output end of the switch control unit. After the ripple voltage is output to the comparator, the comparator is used to compare the sampled ripple voltage with the set reference value, and transmit the comparison result to the switch control unit. The DC voltage (referred...

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Abstract

The invention is suitable for the technical field of a power supply, providing a filtering method for DC voltage output by a switching power supply and a filter device. The filter device comprises a switching control unit, a comparator and a sampling feedback unit, wherein the sampling feedback unit is used for sampling ripple voltage from the output end of the switching control unit and outputs the sampled ripple voltage to the comparator; the comparator is used for comparing the sampled ripple voltage with a set reference value and transmitting the comparison result to the switching control unit; the input end of the switching control unit inputs DC ripple voltage which is output by the switching power supply; and according to the comparison result, the DC ripple voltage which is output by the switching power supply, is controlled to be switched on and off.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a method and a filter device for filtering a DC voltage output by a switching power supply. Background technique [0002] In the field of switching power supplies, people usually go through the following five steps to obtain the DC output voltage and current: 1. The AC signal driven by the switch tube is input to the primary side of the transformer; Output AC signals with different amplitudes; 3. The AC signal on the secondary side is rectified by a diode; 4. The signal after diode rectification passes through an inductor to reduce its current peak value; 5. The signal after passing through an inductor is filtered by a capacitor to output a DC signal. [0003] Since the transformer works in switch mode, the output is only a relative "DC signal". In fact, this "DC signal" has a certain amplitude of ripple voltage, which is not an ideal DC signal. If the ripple ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 李锦乐刘睿华
Owner SHENZHEN TCL NEW-TECH CO LTD
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