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System, method and apparatus to transition between pulse-width modulation and pulse-frequency modulation in a switch mode power supply

A technology of pulse frequency modulation and pulse width modulation, applied in the field of switch mode power supply source, can solve problems such as low efficiency

Inactive Publication Date: 2012-05-09
MICROCHIP TECH INC
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Problems solved by technology

PFM control produces higher efficiency of SMPS during light load conditions, but lower efficiency at higher load conditions

Method used

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  • System, method and apparatus to transition between pulse-width modulation and pulse-frequency modulation in a switch mode power supply
  • System, method and apparatus to transition between pulse-width modulation and pulse-frequency modulation in a switch mode power supply
  • System, method and apparatus to transition between pulse-width modulation and pulse-frequency modulation in a switch mode power supply

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Embodiment Construction

[0027] Reference is now made to the drawings, which schematically illustrate details of specific example embodiments. In the drawings, the same elements will be represented by the same numerals, and similar elements will be represented by the same numerals with different lowercase letter suffixes.

[0028] In a general sense, a power converter can be defined as a device that converts one form of energy into another form of energy on a continuous basis. Any energy storage or loss within such a power system while it is performing its conversion function is generally the same as the process of energy conversion. There are many types of devices that can provide this functionality, with varying degrees of cost, reliability, complexity, and efficiency. Mechanisms for power conversion can take many basic forms, such as those that are mechanical, electrical, or chemical in nature. This article will focus on power converters that employ a restricted set of components, including induc...

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Abstract

A switch mode power supply (SMPS) has optimized efficiency over an entire operating range, from no load to full load, by transitioning between pulse frequency modulation (PFM) and pulse width modulation (PWM) for control of the SMPS depending upon load current. Accurate, smooth, and seamless transitions between PFM and PWM modes of operation occur at a preset load current(s), PFM operation improves efficiency during light load conditions, and PWM has better efficiency at higher load currents. This is advantageous in battery powered applications, and thereby results in a longer time before battery replacement or recharge is necessary.

Description

[0001] Related Application Cross Reference [0002] This application petitions Scott Dearborn's application filed on July 8, 2009, entitled "Instrument for Transitioning Between Pulse Width Modulation and Pulse Frequency Modulation in a Switch Mode Power Supply". System, Method and Apparatus To Transition Between Pulse-Width Modulation and Pulse-Frequency Modulation in a Switch Mode Power Supply (System, Method and Apparatus To Transition Between Pulse-Width Modulation and Pulse-Frequency Modulation in a Switch Mode Power Supply)" jointly owns the priority of U.S. provisional patent application No. The aforementioned application is hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to switch mode power supplies, and more particularly to improving the efficiency of switch mode power supplies (SMPS) by transitioning between pulse width modulation (PWM) and pulse frequency modulation (PFM) control depending on the load. Ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/158
CPCH02M3/1582H02M3/156H02P27/085H03K7/06
Inventor 斯科特·C·迪尔伯恩
Owner MICROCHIP TECH INC
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