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Load detection for a low power mode in an AC-DC adapter
US9054584B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9054584-B2 |
| Application number | US-201213368962-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 8, 2012 |
| Priority date | Feb 16, 2011 |
| Publication date | Jun 9, 2015 |
| Grant date | Jun 9, 2015 |
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Abstract
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Various embodiments of the present invention relate to AC-DC adapters, and more particularly, to systems, devices and methods of employing a load detector to detect a load condition of the AC-DC adapters based on transient variation of a DC output voltage; and therefore, enable the AC-DC adapters to switch from a low power mode to a normal power mode. At the low power mode, a DC output voltage is generated at a target voltage by the AC-DC adapter, and subsequently drops at a decay rate dependent on load condition. The load detector is electrically coupled to monitor the output voltage and measure the decay time between two threshold voltages. An enable instruction is provided to configure the AC-DC adapter to the normal power mode as soon as the decay time is lower than the threshold decay time or the variation of consecutive decay times reaches a certain threshold.
First claim
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We claim: 1. An AC-DC adapter comprising: a switch-mode power supply coupled to receive an input AC voltage, the switch-mode power supply converting the input AC voltage to a DC output voltage that drives a load; a power control loop coupled to the switch-mode power supply, the power control loop receiving the DC output voltage and providing a power control signal to configure the switch mode power supply according to a decay rate of the DC output voltage, wherein the power control…
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Electricity · mapped topic
- H02M7/217Primary
Electricity · mapped topic
Cross-Sectional Technologies · mapped topic
Electricity · mapped topic
Cross-Sectional Technologies · mapped topic
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Frequently asked questions
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- What does patent US9054584B2 cover?
- Various embodiments of the present invention relate to AC-DC adapters, and more particularly, to systems, devices and methods of employing a load detector to detect a load condition of the AC-DC adapters based on transient variation of a DC output voltage; and therefore, enable the AC-DC adapters to switch from a low power mode to a normal power mode. At the low power mode, a DC output voltage …
- Who is the assignee on this patent?
- Haight Carlton Michael, Ortte Jr David Wardell, Maxim Integrated Products
- What technology area does this patent fall under?
- Primary CPC classification H02M7/217. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 09 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).