On-chip soft start circuit and power converter

A soft-start circuit and soft-start technology are applied in the directions of high-efficiency power electronic conversion, adjustment of electric variables, and conversion of DC power input to DC power output. The increase of the overshoot current and the effect of realizing the soft start protection work

Pending Publication Date: 2022-08-05
厦门英麦科芯集成科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide an on-chip soft-start circuit, which aims to solve the problem that the traditional on-chip soft-start circuit has a short soft-start time, which leads to a decrease in the protection effect of the soft-start

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  • On-chip soft start circuit and power converter
  • On-chip soft start circuit and power converter
  • On-chip soft start circuit and power converter

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Embodiment Construction

[0047] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0049] The first aspect of the embodiments of the present invention proposes an on-chip soft-start circu...

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Abstract

The invention provides an on-chip soft start circuit and a power converter, the on-chip soft start circuit comprises a current source, a soft start capacitor, a switch connected in parallel with two ends of the capacitor, a first resistor, a conversion circuit and a boost circuit, through multiple on-off control of the switch, charge and discharge control of the soft start capacitor is realized, and meanwhile, the on-chip soft start circuit is connected with the power converter. In the charging and discharging process, the output voltage of the on-chip soft start circuit gradually rises to the preset reference voltage, the switch stops discharging, finally, a voltage signal in a corresponding rising curve is output to a DC-DC converter in the power converter, the duty ratio of a PWM signal is gradually adjusted, the increase of overshoot current is restrained, and soft start protection work in the preset time length is achieved.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, in particular to an on-chip soft-start circuit and a power converter. Background technique [0002] With the rapid development of microelectronics technology, battery-powered portable devices such as mobile phones, PADs, MP4s, and digital cameras have become popular rapidly. Power management chips, especially power converters with high-efficiency current models, have been widely used. [0003] Soft-start circuits have gradually become an essential part of modern power supply designs due to their ability to limit inrush current and protect electronic systems during transient start-up. [0004] The soft-start circuit can set the switching duty cycle of the DC-DC converter working with PWM Pulse Width Modulation at a smaller ratio during the startup phase, thereby suppressing the increase of overshoot current; as the output voltage rises , the start-up current gradually releases th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32H02M3/00H02M1/08
CPCH02M1/36H02M1/32H02M3/00H02M1/08Y02B70/10
Inventor 李垚苏新河
Owner 厦门英麦科芯集成科技有限公司
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