High-precision sectional type linear slope compensation circuit

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

Active Publication Date: 2012-01-18
ZHEJIANG UNIV
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  • Abstract
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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 su

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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 in more detail, the technical solutions and related principles of the present invention will be described in detail below with reference to the drawings and specific embodiments.

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

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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 generationcircuit, 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 specifically relates to a high-precision segmented linear slope compensation circuit. Background technique [0002] In the 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, inherent cycle-by-cycle current limiting protection, large bandwidth, and easy current sharing. Widely used, LED drive circuit is a typical example of using peak current mode control technology. However, the problem of sub-harmonic oscillation will occur when the converter with peak current control works when the duty cycle is greater than 50%, and slope compensation is usually needed to solve this problem. [0003] Without slope compensation, if the inductor current i L A disturbance Δi L0 , Which will become Where m 1 , M 2 Are the inductor current i L The r...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M3/07
Inventor 宁志华何乐年胡志成
Owner ZHEJIANG UNIV
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