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High-precision sectional type linear slope compensation circuit

A slope compensation, segmented technology, applied in the direction of electrical components, adjusting electrical variables, instruments, etc., can solve problems such as sub-harmonic oscillation, achieve strong signal anti-interference, and ensure the effect of current feedback capability

Active Publication Date: 2013-09-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the converter using peak current control operates at a duty cycle greater than 50%, the problem of sub-harmonic oscillation will occur, and it is usually necessary to introduce slope compensation to solve this problem

Method used

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  • High-precision sectional type linear slope compensation circuit
  • High-precision sectional type linear slope compensation circuit
  • High-precision sectional type linear slope compensation circuit

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Embodiment Construction

[0031] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as image 3 As shown, a high-precision segmented linear slope compensation circuit, including for generating slope compensation signal V Ramp The five-segment slope compensation signal generation circuit 301, the five-segment control signal generation circuit 302 that provides control signals for the five-segment slope compensation signal generation circuit 301, and the bias voltage signal for the five-segment slope compensation signal generation circuit 301 V bias The sawtooth wave generation circuit 303 that provides the sawtooth signal V for the five-segment control signal generation circuit 302, and the narrow pulse signal V for the five-segment slope compensation signal generation circuit 301 and the sawtooth wave ...

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Abstract

The invention discloses a high-precision sectional type linear slope compensation circuit, which comprises a sectional type slope compensation signal generation circuit, a sectional type control signal generation circuit, a sawtooth wave generation circuit and a trigger circuit. Through the sectional type design of the slope compensation signal generation circuit and the control signal generation circuit, when the working duty ratio of a converter is at any condition, the slope complexity can be flexibly controlled, and the current feedback capability, transient response characteristic and load capacity of the converter are ensured; and through regulating the intrinsic standoff ratio and the width-length ratio of a relative metal oxide semiconductor (MOS) tube, the ideal slope compensation signal waveform can be adjusted, the signal anti-jamming performance is strong, so the high-precision sectional type linear slope compensation circuit can be widely applied in peak current mode control direct current / direct current (DC / DC) converters.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high-precision segmented linear slope compensation circuit. Background technique [0002] In small and medium power DC / DC switching power supplies, the peak current mode control technology in the constant frequency PWM closed-loop feedback control system has the advantages of fast transient response, internal inherent cycle-by-cycle current limiting protection, large bandwidth, and easy current sharing. Widely used, LED drive circuits are typical of peak current mode control techniques. However, when the converter using peak current control operates at a duty cycle greater than 50%, the problem of sub-harmonic oscillation will occur, and it is usually necessary to introduce slope compensation to solve this problem. [0003] When slope compensation is not added, if the inductor current i L A disturbance Δi that appears L0 , which will become in the nex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M3/07
Inventor 宁志华何乐年胡志成
Owner ZHEJIANG UNIV
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