Self-adaptive secondary slope compensation circuit for BUCK converter
A slope compensation and self-adaptive technology, which is applied in the electronic field, can solve problems such as constant compensation slope, failure to realize the optimal value of slope compensation, affecting system load capacity, response speed and stability, etc.
Inactive Publication Date: 2016-08-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF3 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] The structure of the fixed slope compensation circuit is simple, but the constant compensation slope leads to overcompensation or undercompensation under certain application conditions, which affects the load capacity, response speed and stability of the system; the compensation slope of the piecewise linear slope compensation is in the whole Several different values can be taken within the range of the duty ratio, which avoids the overcompensation of the fixed slope compensation in the case of a small duty ratio to a certain extent, but it does not realize that the slope compensation is the most optimal under all duty ratios. Excellent value; the quadratic slope compensation solves the correspondence between the optimal compensation slope and the duty cycle well, and achieves good stability and response speed of the system under all duty cycles
However, in order to adapt to more occasions, the current current-mode Buck converter adopts a switching frequency that can be adjusted externally, because different switching frequencies correspond to different inductance values, and the slope of the compensation is related to the inductance value. Slope compensation presents a difficult problem, and none of the above three solutions are applicable anymore
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0037] The technical solution of the present invention will be described in detail below in conjunction with the drawings:
[0038] The present invention provides an adaptive secondary slope compensation circuit, which includes two modules, an adaptive current generating circuit and a secondary voltage signal generating circuit. Such as figure 1 As shown, two sub-module circuits are used in series, which can be applied to a Buck converter in peak current mode. Basic principle analysis: the required secondary ramp signal is shown in equation (1), where Vin is the power source input voltage, Zcf is the current using resistance, and fs is the switching signal with narrow pulse; according to equation (2), the inductance L and The relationship between maximum load current ILOAD, ripple factor a, output voltage and duty cycle can be sorted out to obtain the voltage signal expression (3) related to duty cycle and switching frequency required for adaptive secondary slope compensation. T...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more Abstract
The invention belongs to the field of electronic technology, and particularly relates to a self-adaptive secondary slope compensation circuit for a peak current mode BUCK converter. The circuit in the invention includes a self-adaptive current generating circuit and a secondary voltage signal generating circuit. A first input end of the self-adaptive current generating circuit is connected with a duty cycle signal of a BUCK converter. A second input end of the self-adaptive current generating circuit is connected with reference voltage. An output end of the self-adaptive current generating circuit is connected with a first input end of the secondary voltage signal generating circuit. A second input end of the secondary voltage signal generating circuit is connected with a pulse switch signal. An output end of the secondary voltage signal generating circuit outputs a self-adaptive secondary voltage signal. The invention has the beneficial effects of having the advantage of secondary slope compensation and meanwhile being suitable for a current mode Buck converter with a variable switching frequency.
Description
Technical field [0001] The invention belongs to the field of electronic technology, and specifically relates to an adaptive secondary slope compensation circuit for a peak current mode BUCK converter. Background technique [0002] Most of the increasingly powerful electronic systems use point-of-load power supplies. The requirements for this type of power supply are high reliability, high efficiency, and high power density. Even some battery-powered devices require point-of-load power supplies to be able to operate at very low input voltages. normal work. These high requirements undoubtedly bring new challenges to the design of voltage converters. Current-mode switching power supply chips are widely used as point-of-load power supplies due to their advantages of simple compensation loop and good dynamic performance. However, current mode control is susceptible to some factors, such as improper slope compensation, which can cause sub-harmonic oscillation or poor loop response. ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/1563H02M3/1566
Inventor 罗萍韩晓波王军科周才强曹灿华缪昕昊肖天成
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap