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Switching Power Supply and Its Voltage Sampling Circuit

A technology of voltage sampling and sampling voltage, applied in the direction of measuring current/voltage, electrical components, measuring electrical variables, etc., can solve the problem of reducing the constant voltage accuracy of the switching power supply, the difficulty of maintaining the output voltage of the secondary coil stable, and the inability to accurately represent the output voltage. and other problems to avoid the impact of sampling voltage, improve user experience, improve stability and accuracy

Active Publication Date: 2020-04-24
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the disadvantage of the related technology is that the load size will affect the voltage of the voltage feedback pin, resulting in the change of the sampled voltage value, which cannot accurately represent the output voltage. Therefore, the output voltage of the secondary coil is difficult to maintain stability and reduce The constant voltage accuracy of the switching power supply

Method used

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  • Switching Power Supply and Its Voltage Sampling Circuit
  • Switching Power Supply and Its Voltage Sampling Circuit
  • Switching Power Supply and Its Voltage Sampling Circuit

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] For ease of understanding, the working principle of the voltage sampling circuit in the related art will be briefly introduced first.

[0027] In the related art, the voltage sampling circuit performs filtering processing through RC, so as to filter out the high-frequency interference in the voltage V1' waveform of the voltage sampling point. When the voltage V1' at the voltage sampling point rises above the preset threshold such as 0.1V, the output signal of the comparator of the voltage sampling circuit jumps from low le...

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Abstract

The invention discloses a switching power supply and a voltage sampling circuit thereof. The circuit includes: a sampling and holding module, which has a sampling input terminal, a sampling output terminal and a sampling control terminal, and is used for sampling the voltage of a voltage sampling point during the sampling phase to Make the sampling voltage of the sampling output end follow the voltage of the voltage sampling point, and maintain the sampling voltage of the sampling output end after the sampling phase ends; the control module is used to determine that the voltage of the voltage sampling point is in the sampleable voltage range according to the voltage of the voltage sampling point , control the sampling and holding module to enter the sampling phase, and when it is judged that the voltage of the voltage sampling point is at the voltage inflection point according to the voltage of the voltage sampling point and the sampling voltage of the sampling output terminal, the sampling phase of the control sampling and holding module ends so that the sampling voltage of the sampling output terminal The voltage corresponding to the voltage inflection point is maintained, so that by sampling the voltage at the voltage inflection point, the magnitude of the output voltage can be accurately reflected, and the constant voltage accuracy of the switching power supply is improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a voltage sampling circuit and a switching power supply with the circuit. Background technique [0002] Due to the advantages of small size, high efficiency and large current, switching power supply is widely used in power solutions such as mobile phone chargers and adapters. The voltage sampling circuit of the switching power supply in the related art usually samples the voltage change of the feedback coil through the voltage feedback pin, and controls the operating frequency and the conduction duty cycle of the power switch tube according to the sampled voltage value, so as to adjust the secondary coil The output voltage. [0003] However, the disadvantage of the related technology is that the load size will affect the voltage of the voltage feedback pin, resulting in the change of the sampled voltage value, which cannot accurately represent the output voltage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
CPCG01R19/2503H02M1/0009H02M3/33507G01R19/2509G01R19/18H02M3/33523
Inventor 蒋幸福王文情
Owner BYD SEMICON CO LTD
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