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Power Dissipation Monitor for Current Sinking Function of Power Switching Transistors

A technology of current regulator and switch, which is applied in the direction of electric light source, electric lamp circuit layout, light source, etc., and can solve the problem of not being able to draw current

Active Publication Date: 2016-03-09
DIALOG SEMICONDUCTOR GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, traditional LED lights are not capable of drawing current from the dimmer switch in a way that allows the dimmer's internal circuitry to function properly

Method used

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  • Power Dissipation Monitor for Current Sinking Function of Power Switching Transistors
  • Power Dissipation Monitor for Current Sinking Function of Power Switching Transistors
  • Power Dissipation Monitor for Current Sinking Function of Power Switching Transistors

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Embodiment Construction

[0015] The figures and the following description refer to various embodiments by way of illustration only. It should be noted that from the following discussion, it will be readily recognized that alternative embodiments of the structures and methods disclosed herein are available substitutions that may be employed without departing from the principles discussed herein.

[0016] Reference will now be made in detail to various embodiments, examples of which are illustrated in the accompanying drawings. It is noted that wherever applicable similar or identical reference numerals may be used in the figures and may indicate similar or identical functionality. These figures depict various embodiments for purposes of illustration only. Those skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods described herein may be employed without departing from the principles described herein.

[0017] Embodiments d...

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PUM

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Abstract

The embodiments disclosed herein describe a method of a power controller for monitoring for unsafe operating conditions of a drive transistor in a switching power converter of a LED lamp system by predicting the power dissipation of the drive transistor based on knowledge of the current through the drive transistor and a continuous observation of the voltage across the drive transistor. When the drive transistor approaches unsafe operating conditions, the power controller turns off the drive transistor.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of co-pending US Provisional Patent Application No. 61 / 610,377, filed March 13, 2012, which is hereby incorporated by reference in its entirety. technical field [0003] Embodiments disclosed herein relate generally to switching power converters, and more particularly to monitoring of unsafe operating states of switching transistors of switching power converters. Background technique [0004] LED light systems generally include conventional LED lights used with conventional dimmer switches. Traditional dimmer switches use a TRIAC circuit to adjust the lamp input voltage. A TRIAC is a bi-directional device that conducts current in either direction when it is triggered (ie, turned on). Once triggered, the TRIAC continues to conduct until the current drops below a certain threshold, known as the sustaining current threshold. For a TRIAC dimmer's internal timing to work correctly, cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor J·W·克斯特松R·M·迈尔斯
Owner DIALOG SEMICONDUCTOR GMBH