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Adaptive conduction time generation circuit applied in dc-dc converter

A DC-DC, on-time technology, used in analog integrated circuits, DC-DC converters, and adaptive on-time generation circuits, can solve problems such as weak transient response capabilities, and achieve good transient response capabilities, The effect of avoiding electromagnetic interference

Active Publication Date: 2015-10-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the transient response capability of the traditional current and voltage control mode DC-DC chip is weak and the traditional fixed on-time control mode will bring electromagnetic interference (EMI), and propose a DC-DC The adaptive on-time generation circuit in the converter generates the output voltage V by sampling the input and output voltage and load information. OUT proportional to the input voltage V IN It is inversely proportional to the on-time of the main switch tube that increases with the increase of the load current, avoiding the electromagnetic interference (EMI) brought to the subsequent system due to the change of the chip switching frequency with the duty cycle, and improving the transient response speed

Method used

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  • Adaptive conduction time generation circuit applied in dc-dc converter
  • Adaptive conduction time generation circuit applied in dc-dc converter
  • Adaptive conduction time generation circuit applied in dc-dc converter

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Embodiment 1

[0022] refer to figure 2 , The adaptive on-time generation circuit of the present invention includes: an input voltage sampling unit 1 , an output voltage and current sampling compensation unit 2 and a comparison and time logic generation unit 3 .

[0023] The input voltage sampling unit 1 is provided with three input terminals a, b, c and an output terminal d; wherein the first input terminal a and the second input terminal b are respectively connected to the input voltage V of the DC-DC converter IN and DC-DC converter internal reference voltage V R , for the DC-DC converter input voltage V IN Sampling; the third input terminal c is connected with the pulse inverse signal output by the time logic generation unit 3 ;Output d output voltage signal V C To compare and time logic generation unit 3, the voltage signal V C proportional to the DC-DC converter input voltage V IN and the conduction time of the main switch in the DC-DC converter.

[0024] The output voltage and...

Embodiment 2

[0070] The output voltage and current sampling compensation unit 2 and the comparison and time logic generation unit 3 of the present invention are the same as those in the first embodiment.

[0071] refer to Figure 5 , the input voltage sampling unit 1 of the present invention comprises: operational amplifier 401, 2 PMOS transistors M 401 , M 402 , 2 NMOS tubes M 404 , M 405 , the third capacitor C 3 and 3 resistors, the tenth resistor R 10 , Eleventh resistance R 11 and the twelfth resistor R 12 ;

[0072] The eleventh resistor R 11 with the twelfth resistor R 12 in series, across the DC-DC converter’s input voltage V IN between the ground;

[0073] The operational amplifier 401, its non-inverting input terminal is connected to the eleventh resistor R 11 with the twelfth resistor R 12 The common end; its inverting input and NMOS tube M 404 The source is connected; its output is connected to the NMOS tube M 404 grid;

[0074] The NMOS tube M 404 , its drain ...

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Abstract

The invention discloses an adaptive turn-on time generation circuit applied to a DC-DC converter, which mainly solves problems that the transient response capacity of an existing current and voltage control mode is weak and that a fixed turn-on time control mode brings about electromagnetic interferences. The adaptive turn-on time generation circuit comprises an input voltage sampling unit (1), an output voltage and current sampling compensation unit (2) and a comparison and logic time generation unit (3), wherein the input voltage sampling unit (1) samples input voltage VIN of the converter and outputs a voltage signal VC; the output voltage and current sampling compensation unit (2) samples voltage of a joint point of two switching tubes in the converter and outputs a compensated output voltage sampling signal VOUT1; and the comparison and logic time generation unit (3) compares the voltage signal VC and the compensated output voltage sampling signal VOUT1 and calculates, and outputs a pulse signal DR controlling turn-on of the master switching tube. The adaptive turn-on time generation circuit disclosed by the invention improves the transient response capacity of the converter, avoids influences imposed on a rear-stage circuit by electromagnetic interferences, and can be applied to the DC-DC converter.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an analog integrated circuit, in particular to an adaptive conduction time generation circuit, which can be used for a DC-DC converter in a conduction time control mode. Background technique [0002] As high-speed digital systems such as CPU processors, DSP, etc. become more and more complex, the requirements for the load transient response capability of power management chips are also getting higher and higher. Traditional current control modes and voltage control modes require error amplifiers And the compensation network, and the fixed frequency signal generated by the oscillator triggers the opening of the main switch, which greatly affects the transient response capability of the chip. [0003] The constant on-time control mode has good transient response capability because it does not require an error amplifier and compensation circuit. The system structure of a t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10H02M1/44
Inventor 来新泉邵丽丽李演明徐灵炎
Owner XIDIAN UNIV