Segmented slope compensation circuit applicable to BUCK converter

A technology of slope compensation and converter, applied in electrical components, output power conversion devices, improved amplifiers to improve efficiency, etc., can solve the problems of current mode noise sensitivity, large mismatch, ripple, etc., and achieve the goal of improving accuracy Effect

A technology of slope compensation and converter, applied in electrical components, output power conversion devices, improved amplifiers to improve efficiency, etc., can solve the problems of current mode noise sensitivity, large mismatch, ripple, etc., and achieve the goal of improving accuracy Effect

CN107707103AActive Publication Date: 2018-02-16UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Segmented slope compensation circuit applicable to BUCK converter
  • Segmented slope compensation circuit applicable to BUCK converter
  • Segmented slope compensation circuit applicable to BUCK converter

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Experimental program
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Effect test

Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Such as figure 2 The current feedback control model based on the DC-DC converter is shown, where Tcm is the duty cycle modulation coefficient, Tps is the control amount of the duty cycle to the inductor current, Zcf is the equivalent sampling resistance, and He(s) is the sample and hold Behavior introduces double zeros.

[0046] The appropriate slope compensation can be found through the control-to-output transfer function when the current loop is closed.

[0047]

[0048] Among them, Tcl represents the transfer function of the control loop from the control voltage to the output voltage, Zcf represents the equivalent sampling resistance, s is the frequency term of Laplace, ω n Represents one-half of the switching frequency, ζ represents the damping factor, and there are:

[0049]

[0050] Among them, L is the external inducta...

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Abstract

A segmented slope compensation circuit applicable to a BUCK converter belongs to the technical field of an electronic circuit. An oscillator circuit is used for introducing output voltage informationof the BUCK converter, a negative input end voltage of an operational amplifier is clamped to a positive input end voltage thereof, a first capacitor is charged by a current mirror, the negative inputend voltage, namely a slop voltage signal, of the operational amplifier is obtained, the slop voltage signal is compared with a second reference voltage to obtain a periodic slope voltage signal, a slope current generation circuit is used for generating compensation slopes with different slope rates under different duty ratios, a slope voltage correlated to the duty ratios is generated on a sampling resistor after passing through a slope summing circuit, and a base current compensation circuit is used for stabilizing a system. Compared with a traditional slope compensation circuit, the segmented slope compensation circuit has the advantages that the system stability is improved by employing different slope compensation rates under different duty ratios; and with the adoption of a triode as a buffer, the segmentation accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a segmented slope compensation circuit for a Buck converter. Background technique [0002] The peak current mode DC-DC converter is prone to sub-harmonic oscillation when the duty cycle D>50%. The slope compensation is the key to ensure the normal operation of the current mode DC-DC converter. Traditional slope compensation proposes to use a fixed slope, which usually results in overcompensation in the case of a small duty cycle, thereby affecting the transient response characteristics and load capacity of the DC-DC converter. [0003] Such as figure 1 The conventional slope compensation circuit shown includes a slope voltage generating circuit and a slope compensation circuit. The non-inverting input terminal of the operational amplifier OP1 is connected to the reference voltage V REF2 , the negative phase input terminal is connected to the source t...

Claims

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Application Information

Patent Timeline
16 Feb 2018
Publication
CN107707103A
IPC
H02M1/088; H03F1/02
Inventors
明鑫; 辛杨立