Power converter system
US-2024364218-A1 · Oct 31, 2024 · US
Temperature compensation of output diode in an isolated flyback converter
US9019727B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9019727-B2 |
| Application number | US-201213552360-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 18, 2012 |
| Priority date | Jul 18, 2012 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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Abstract
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An isolated flyback converter having temperature compensation (TC) uses primary side sensing and an output diode, the output diode having a variable voltage drop related to its temperature. A feedback voltage V FB , proportional to the output voltage V OUT , in a feedback loop is compared to a fixed reference voltage V REF for setting a duty cycle of a power switch, wherein V FB is caused to approximately equal V REF . A TC circuit has a voltage source configured to generate a proportional-to-absolute-temperature voltage V PTAT , wherein V PTAT is at approximately V REF at a calibration temperature T 0 and rises as a temperature exceeds T 0 . The voltage source is connected to the V FB node via a TC resistor R TC , so that at T 0 no current flows through R TC . Therefore, the selection of the optimal R TC does not affect the selection of a scaling resistance for generating V FB . The current through R TC at elevated temperatures compensates V OUT .
First claim
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What is claimed is: 1. A flyback converter having temperature compensation, the converter comprising: a transformer having a primary winding and a secondary winding, the primary winding being part of a primary side of the converter, and the secondary winding being part of a secondary side of the converter, wherein the primary side is isolated from the secondary side such that the converter is an isolated converter; a power switch coupled to the primary winding, wherein a duty cy…
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- What does patent US9019727B2 cover?
- An isolated flyback converter having temperature compensation (TC) uses primary side sensing and an output diode, the output diode having a variable voltage drop related to its temperature. A feedback voltage V FB , proportional to the output voltage V OUT , in a feedback loop is compared to a fixed reference voltage V REF for setting a duty cycle of a power switch, wherein V FB is caused to …
- Who is the assignee on this patent?
- Chen Min, Morris John David, Negrete Michael George, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H02M3/156. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).