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Switching regulator

A switching regulator, switching technology, applied in the direction of electronic switches, instruments, electric solid devices, etc., can solve the problems of interference and distortion of nearby circuits

Active Publication Date: 2014-05-07
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This pulse generates EMI that can interfere with or create distortion in nearby circuits

Method used

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Examples

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Embodiment Construction

[0037] In all examples, it is assumed that the gates of the MOSFET switches are connected to a conventional synchronous PWM controller for a DC-DC converter, with a conventional output circuit connected to terminals 1, 2 and 3 as required for the particular type of converter. The output circuit usually consists of one or more inductors and one or more large smoothing capacitors. The data sheet for the LT8611 Synchronous Buck Regulator available online at the Linear Technology Corporation website shows a suitable PWM controller and output circuit for the switches described herein, and is incorporated herein by reference as an example for the synchronous switch. A typical example of a PWM controller and output circuit. Other suitable PWM controllers and output circuits are described in US Patents 5,731,731 and 5,847,554, assigned to the present assignee, also incorporated herein by reference. The controller can switch at fixed or variable frequency.

[0038]According to the pr...

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Abstract

The invention uses a novel switching regulator structure to split a single magnetic loop into multiple magnetic loops, with linked opposing magnetic fields, to cause a cancelling effect, resulting in a much lower overall magnetic field. EMI is thus reduced. In an embodiment, synchronously switched transistors are divided up into parallel topside transistors and parallel bottomside transistors. The topside transistors are positioned to oppose the bottomside transistors, and bypass capacitors are connected between the pairs to create a plurality of current loops. The components are arranged to form a mirror image of the various current loops so that the resulting magnetic fields are in opposite directions and substantially cancel each other out. Creating opposite current loops may also be achieved by forming the conductors and components in a figure 8 pattern with a cross-over point.

Description

[0001] Cross References to Related Applications [0002] This invention claims provisional patent application titled "Magnetic Field Cancellation In Switching Regulators" filed Oct. 19, 2012 by Leonard Shtargot et al. Priority to application 61 / 715,947, the contents of which are hereby incorporated by reference. technical field [0003] The invention relates to a switching regulator, in particular to a technique for reducing electromagnetic interference (EMI) caused by a magnetic field generated by a high-frequency switch. Background technique [0004] Switching regulators generally switch at a frequency of 100KHz-5MHz. The small current loops created at this high speed generate significant magnetic fields. If the switch is formed in an integrated circuit (IC), the current loop may occur entirely within the IC, or partly inside and partly outside the IC. High di / dt can cause high magnetic fields that generate electromagnetic interference (EMI) if the turn off of the power...

Claims

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Application Information

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IPC IPC(8): H02M1/44H02M3/10
CPCH02M1/44H03K17/161H02M3/1588Y02B70/10G05F1/10H01L27/0207
Inventor 伦纳德·什塔戈特丹尼尔·郑约翰·加德纳杰弗里·威特克里斯琴·屈克
Owner ANALOG DEVICES INT UNLTD