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An Adaptive Soft-Start Circuit with Unsteady Current Limit

A technology of soft-start circuit and current limitation, which is applied in the direction of electrical components, adjusting electrical variables, control/regulation systems, etc., can solve the problems of long start-up time, burned chips, high duty cycle, etc., and achieve the effect of reducing process deviation

Active Publication Date: 2019-08-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above situation will cause problems such as high duty cycle in some start-up situations
At the same time, because the capacitance and bias current are greatly affected by the process deviation, it is usually necessary to set a large margin to ensure the normal function of the soft start, which often makes the DC-DC converter have a relatively long start-up time
In addition, during soft start and other processes, the converter does not work in a steady state, especially in the current mode DC-DC converter, its unsteady current is not controlled during these processes, and even in extreme cases There is a situation where a large current burns the chip

Method used

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  • An Adaptive Soft-Start Circuit with Unsteady Current Limit
  • An Adaptive Soft-Start Circuit with Unsteady Current Limit
  • An Adaptive Soft-Start Circuit with Unsteady Current Limit

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Embodiment Construction

[0020] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0021] The present invention is suitable for switching converters. The following takes the current mode switching converter as an example, such as figure 1 Shown is the structural block diagram of the adaptive soft-start circuit with astable current limit provided by the present invention, including an adaptive soft-start voltage generating circuit and a voltage selection circuit, the current-to-analog switching converter includes an error amplifier EA, and an adaptive soft start The first input terminal of the voltage generating circuit is connected to the first bias voltage Vref1, the second input terminal is connected to the output signal EA_OUT of the error amplifier EA, and the output terminal outputs the soft start signal SS_OUT which is connected to the first input terminal of the voltage selection circuit; The second input terminal of the circuit is con...

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Abstract

An adaptive soft-start circuit with unsteady-state current limitation belongs to the technical field of electronic circuits. The present invention is applied to a switching converter, including an adaptive soft-start voltage generation circuit and a voltage selection circuit, the switching converter includes an error amplifier, and the voltage selection circuit compares the soft-start signal output by the adaptive soft-start voltage generation circuit with the second bias voltage , and the signal with a lower voltage value is input to the positive input terminal of the error amplifier; the error amplifier amplifies the error of its input signal and outputs it to the second input terminal of the adaptive soft-start voltage generation circuit, the adaptive soft-start The first input terminal of the voltage generating circuit is connected to the first bias voltage, and the charging current of the internal capacitor C is regulated according to the input signal thereof. The above circuit constitutes a negative feedback structure, so that the output signal of the error amplifier is clamped near the first bias voltage during the soft start, so that the inductor current can be kept at an appropriate value during the start.

Description

Technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an adaptive soft start circuit with a function of limiting unsteady current applied to a DC-DC switching converter. Background technique [0002] In many applications of DC-DC converters, a soft-start module is usually designed to prevent problems such as excessive current and logic errors during the hard power-up of the chip. The traditional method of the soft-start circuit is to charge the capacitor with a constant current. The capacitor voltage is used as the output voltage of the soft-start circuit. The output voltage is supplied to one of the inputs of the error amplifier, so that the output voltage of the converter follows the rise of the soft-start voltage. The speed increases to achieve the purpose of soft start. However, since the charging current of the traditional soft start is fixed, the rising slope of its output voltage is also fixed, and the DC-DC converter u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32H02M3/158
CPCH02M1/32H02M1/36H02M3/158H02M1/325
Inventor 罗萍黄龙刘泽浪陈佳伟曾鹏灏杨鹏博周先立
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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