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Buck converter with fast dynamic response

A dynamic response, converter technology, used in output power conversion devices, DC power input to DC power output, instruments, etc., can solve the problems of output undershoot, converter response speed reduction, output overshoot, etc. Achieve the effect of reducing overshoot or undershoot and fast load response

Pending Publication Date: 2021-05-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, constant on-time control still has some limitations at sudden load changes
As the load rises, the increase in inductor current is limited by the constant on-time (Ton) and the minimum off-time of the system, which eventually produces output undershoot
On the other hand, in case of load drop, if a load change occurs initially at Ton, the inductor current will increase until the end of the fixed on-time, thus creating an overshoot at the output
This will reduce the response speed of the converter

Method used

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  • Buck converter with fast dynamic response
  • Buck converter with fast dynamic response
  • Buck converter with fast dynamic response

Examples

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Embodiment Construction

[0015] Such as figure 1 As shown, a Buck converter with fast dynamic response includes a power stage circuit, a feedback circuit and a control loop; the feedback circuit is used to sample the output voltage value of the converter and send it to the control loop for processing; the control loop The circuit generates a pulse signal with a corresponding duty cycle according to the sampled output voltage value; the power stage circuit generates an output voltage according to the pulse signal output by the control loop.

[0016] In a further embodiment, the power stage circuit includes a first switch S1, a second switch S2, a power inductor L, an output capacitor Co, a parasitic resistance Resr of the output capacitor, a load resistor RL, a first NMOS transistor MZ, and the first NMOS transistor MZ. One end of a switch S1 is connected to the input voltage, the other end is connected to one end of the second switch S2, the drain stage of the first NMOS transistor MZ, and one end of ...

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Abstract

The invention discloses a Buck converter with quick dynamic response. The Buck converter with quick dynamic response comprises a power level circuit, a feedback circuit and a control loop, wherein the feedback circuit is used for sampling an output voltage value of the converter and sending the output voltage value to the control loop for processing; the control loop generates a pulse signal with a corresponding duty ratio according to the sampled output voltage value; and the power level circuit generates output voltage according to the pulse signal output by the control loop. According to the invention, a compensation module is added on the basis of a traditional COT, and meanwhile, a Ton module is improved to a certain extent, so the working performance of the Buck converter is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to a Buck converter circuit with fast dynamic response. Background technique [0002] The development of the Internet of Things (IOT) puts higher performance on the power management unit. Due to the use of small-capacity batteries, the light-load efficiency of power chips is particularly important for IOT devices. Because the constant on-time (Constant onTime, COT) control has the advantages of fast transient response and small transient voltage change, the operating frequency can be automatically reduced under light load or no-load conditions, which improves light load efficiency. Therefore, the COT control mode can well meet the needs of IOT devices. [0003] However, constant on-time control still has some limitations when the load changes suddenly. As the load rises, the increase in inductor current is limited by the constant on-time (Ton) and the minimum system o...

Claims

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Application Information

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IPC IPC(8): H02M3/158H02M1/088H02M1/34
CPCH02M3/1582H02M1/088H02M1/34
Inventor 孙大鹰付天翔杜明浩陈颖涛顾文华
Owner NANJING UNIV OF SCI & TECH
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