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Fixed open-circuit time controller and buck converter device using it

A time controller and time control technology, applied in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc. limit, improved signal jitter, improved stability and noise tolerance

Active Publication Date: 2021-09-21
ELITE SEMICON MEMORY TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a buck converter device including a buck converter fixed open-circuit time controller, which is electrically connected to the buck converter, so as to solve the problem of stability and noise sensitivity. Emotional question

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  • Fixed open-circuit time controller and buck converter device using it
  • Fixed open-circuit time controller and buck converter device using it
  • Fixed open-circuit time controller and buck converter device using it

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Embodiment Construction

[0063] In order to make it easier for examiners to understand the purpose, effect and technical characteristics of the present invention, the detailed description and appended Figure 1 and provide.

[0064]An embodiment of the present invention provides a buck converter device, which includes a fixed open-circuit time controller and a buck converter, which is electrically connected to the buck converter, wherein the current of the fixed open-circuit time controller The ripple extractor senses the current flowing in the energy storage inductor, which flows through the equivalent series resistance of the output capacitor (ie, senses a low side current of the buck converter), to remove a DC current component in the sensed current to generate an extracted ripple current, and generate a ripple voltage signal to a comparator of the fixed open-circuit time controller according to the extracted ripple current to extend the fixed The noise margin of the open-circuit time controller. ...

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Abstract

A fixed open-circuit time controller has a voltage divider, a current ripple extractor, a one-shot open-circuit timer, a comparator and a flip-flop. A voltage divider generates a feedback voltage based on the regulator output voltage. The current ripple extractor senses the current in the energy storage inductor of the buck converter, which flows through the equivalent series resistance of the output capacitor, and generates an extracted ripple current without a DC component accordingly. The single-shot open-circuit timer outputs a fixed open-circuit time control signal according to the input voltage of the buck converter and the output voltage of the regulator. The modulation circuit outputs a modulation signal according to the reference voltage signal, the feedback voltage and the extracted ripple current. The flip-flop generates a control signal to the buck converter according to the modulation signal and the fixed open-circuit time control signal. The off-circuit time of the buck converter is determined according to the modulation signal.

Description

technical field [0001] The invention relates to a step-down converter, in particular to a constant on-time controller for a step-down converter device. Background technique [0002] Fixed open circuit time controllers can be used in buck converter devices, whenever the regulator output voltage drops below the reference voltage, the fixed open circuit time controller can use the regulator output voltage ripple to initiate an open circuit time . The open time can be terminated (generated by an open time pulse) by the circuit reacting to other conditions such as the level of the regulator input voltage. During the open-circuit time pulse, energy is supplied directly from the regulator input voltage to the regulator output voltage via the electronic switching device. Similarly, the energy stored in the energy storage inductor will be supplied to the regulator output voltage when the open circuit time pulse has been terminated. [0003] Buck converter devices with fixed open-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/44
CPCH02M1/44H02M3/1584
Inventor 何仪修
Owner ELITE SEMICON MEMORY TECH INC