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Power supply topologies with PWM frequency control

A frequency control and circuit technology, applied in control/regulation systems, output power conversion devices, electrical components, etc., can solve problems such as difficulty in selecting inductance

Inactive Publication Date: 2008-03-26
O2 MICRO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the DC rated current is inversely proportional to the inductive reactance, it is difficult to select an inductor that meets the above two requirements

Method used

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  • Power supply topologies with PWM frequency control
  • Power supply topologies with PWM frequency control
  • Power supply topologies with PWM frequency control

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Embodiment Construction

[0012] Reference will now be made in detail to embodiments of the present invention. While the invention is described in conjunction with these embodiments, it will be understood that it is not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.

[0013] Moreover, in the following detailed description of the invention, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, one of ordinary skill in the art will recognize that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure the present invention.

[0014] In one embodiment, the present invention provides a p...

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Abstract

A power supply topology with pulse width modulation frequency control allows the use of an inductor with higher inductance in a converter. By controlling the switching frequency of the pulse width modulation signal, the inductor can achieve high efficiency during a light load condition and is also suitable for a heavy load condition.

Description

technical field [0001] The present invention relates to power management circuit topologies, and more particularly to power management circuit topologies with pulse width modulation (PWM) control capable of supporting multiple load level applications. Background technique [0002] When selecting an inductor in a switching circuit (eg, a buck-boost converter), concerns include inductive reactance, DC current rating, and DC resistance (DCR) value. A basic characteristic of an inductor is the DC rated current, which indicates the maximum current allowed to flow through the inductor. The DC rated current is determined by inductive reactance, inductance size, winding length and wire diameter ratio. For a given inductor size, the DCR value is directly proportional to the inductive reactance, and the DC current rating is inversely proportional to the inductive reactance. [0003] For a DC / DC boost converter, its efficiency is also directly proportional to the inductive reactance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/157
Inventor 林春喜王佛贤龚键俞振祥
Owner O2 MICRO INC