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Pulse Density D/A Converter with Slope Compensation

An analog-to-analog converter and slope compensation technology, applied in the field of switching mode power supplies, can solve the problems that the analog circuit necessary for the slope compensation function is large, cannot be constructed, and is expensive

Active Publication Date: 2018-09-14
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, the necessary analog circuitry required for slope compensation functionality is too large and expensive to build in small process geometry integrated circuits, and is therefore not cost effective for use in price sensitive products

Method used

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  • Pulse Density D/A Converter with Slope Compensation
  • Pulse Density D/A Converter with Slope Compensation
  • Pulse Density D/A Converter with Slope Compensation

Examples

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Embodiment Construction

[0028] PDM DACs (Pulse Density Modulated Digital-to-Analog Converters) provide a low-cost way to generate reference voltages to analog comparators for engine control and SMPS applications. PDM DAC modules are primarily digital designs, so porting is not an issue when moving to new process technologies. Large digital content scales well with craft scaling.

[0029] According to various embodiments of the present invention, slope compensation functionality for SMPS systems may be implemented with a digital-to-analog converter (DAC) using pulse density modulation (PDM), a digital slope generator, and a selectable response with at least one pole mode low-pass filter such as a resistor-capacitor (RC) is provided.

[0030] Referring now to the drawings, details of certain example embodiments are schematically illustrated. Like elements in the drawings will be denoted by like numerals, and similar elements will be denoted by like numerals with different lowercase letter suffixes. ...

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PUM

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Abstract

A slope compensation module provides slope compensation for a switched mode power supply using current mode control. This slope compensation function can be provided by a digital slope compensation generator and a pulse density modulation digital-to-analog converter (PDM DAC) with a selectable response mode low pass filter.

Description

[0001] Related patent applications [0002] This application claims priority to commonly-owned US Provisional Patent Application Serial No. 61 / 777,808, filed March 12, 2013, which is hereby incorporated by reference herein for all purposes. technical field [0003] The present invention relates to switched mode power supplies (SMPSs), and more particularly to providing slope compensation in SMPSs by means of digital-to-analog converters (DACs) using pulse density modulation (PDM). Background technique [0004] Normally, in a switched mode power supply (SMPS), the peak current value is related to the average current in the inductor. But for some SMPS circuit topologies, when the pulse width modulation (PWM) duty cycle is greater than 50%, there is an altered relationship between the peak and average current through the inductor, where the peak current is no longer proportional to the average current. This can cause instabilities, eg, sub-harmonic oscillations. The basic ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157H02M3/335
CPCH02M3/157H02M3/33515H03M7/3028H03M7/3042H03M3/502H03M1/66
Inventor 布赖恩·克里斯安德鲁斯·瑞特提伯·富图亚历克斯·杜梅亚斯
Owner MICROCHIP TECH INC