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Dynamically enhancing loop response after recovery from fault conditions

A dynamic enhancement, loop response technology, applied in output power conversion devices, DC power input conversion to DC power output, instruments and other directions, can solve problems such as bad transients and slow recovery of converters

Pending Publication Date: 2021-01-05
NXP USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recovery from saturation can be slow and thus can induce undesirably large transients at the output of the converter

Method used

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  • Dynamically enhancing loop response after recovery from fault conditions
  • Dynamically enhancing loop response after recovery from fault conditions
  • Dynamically enhancing loop response after recovery from fault conditions

Examples

Experimental program
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Embodiment Construction

[0044]Embodiments described herein provide a method and apparatus for preventing an output of a PWM converter from overshooting during recovery from a fault condition. Overshoot is avoided by predictively determining the error output level of the error amplifier to speed recovery from fault conditions. More specifically, the output of an error amplifier that is prone to saturation during a fault condition is dynamically preset to the state (eg, voltage level) that is closest to the state the error amplifier will be in after recovery from the fault condition. In one embodiment, the state is preset for each cycle of the PWM converter during the presence of the fault condition, so recovery from the fault does not depend on the length of time the PWM converter spends in the fault condition. The value of the state is dynamically determined based on other conditions of the PWM power stage that are less likely to saturate during a fault condition.

[0045] figure 1 An example embod...

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PUM

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Abstract

The invention relates to dynamically enhancing loop response after recovery from fault conditions. A method for dynamically enhancing loop response after recovery from a fault condition includes detecting a fault condition in response to a programmed output voltage of a pulse width modulation (PWM) converter decreasing below an input voltage of the PWM converter; in response to detecting the faultcondition, sampling a peak voltage at the end of at least one of a plurality of clock cycles of the PWM converter, wherein the peak voltage is proportional to a sense current conducted through a transistor; and presetting the error output of the error amplifier as an error value determined by the peak voltage; controlling a PWM driver with the error value to drive the transistor; and in responseto the input voltage increasing above the programming output voltage, charging an output load to the programming output voltage with the transistor.

Description

technical field [0001] The present disclosure relates generally to pulse width modulation (PWM) converters, and more particularly, to enhancing the loop response of a PWM converter in response to recovering from a fault condition. Background technique [0002] Current mode PWM converters may enter various limiting conditions outside of normal operation. It is generally desirable for a converter to enter and leave these limiting conditions slowly, and preferably to have a predictable and controlled amount of disturbance at its output, or no disturbance at all. These limiting conditions may include dropout voltage, current limiting, etc., which would cause one of the converter's state variables to saturate. [0003] A dropout condition is defined as the condition when the converter's input voltage drops below its programmed output voltage. During dropout conditions, the duty cycle of the converter may saturate to a 100% duty cycle. The dropout condition in turn saturates ot...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M3/156H02M1/32
CPCH02M1/08H02M3/156H02M1/32H02M1/0025H02M1/325H02M3/1566H03K7/08H02M1/0012
Inventor P·E·聂拉J·R·古德费洛O·波克
Owner NXP USA INC