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US 9,960,686 B2Granted
System and method for detecting a loss of AC power in a switched-mode power supply
AssigneeInfineon Technologies Austria AG
InventorsWeifu Yu, Nitin Agarwal, Mingping Mao, Guoxing Zhang
Life of this patent
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Abstract
In accordance with an embodiment, a method of operating a power supply includes detecting a loss of at least one of an AC input voltage an AC input power at an input of the power supply, and increasing a switching frequency of the power supply upon detection of the loss of the AC input voltage or AC input power.
Claims26
A method of operating a switched-mode power supply having an AC/DC converter followed by a DC/DC converter, the method comprising:
- operating the switched-mode power supply in a normal operation mode comprising providing a first switching signal to the AC/DC converter and providing a second switching signal to the DC/DC converter;
- detecting a loss of an AC input signal coupled to an input of the AC/DC converter;
- and
- in response to detecting the loss of the AC input signal, deactivating the first switching signal and increasing a frequency of the second switching signal.
1 more element
A system comprising:
- a pulse generator configured to provide a first switching signal to an AC/DC converter, and configured to provide a second switching signal to a DC/DC converter having an input coupled to an output of the AC/DC converter;
- and
- control circuit configured to
- detect a loss of an AC input signal coupled to an input of the AC/DC converter;
- and
- in response to detecting the loss of the AC input signal, deactivating the first switching signal and increasing a frequency of the second switching signal.
3 more elements
A system comprising:
- an AC/DC converter;
- a resonant converter having an input coupled to an output of the AC/DC converter;
- a pulse generator configured to provide a first switching signal to the AC/DC converter, and configured to provide a second switching signal to the resonant converter;
- and
- control circuit configured to
- detect a loss of an AC input signal coupled to an input of the AC/DC converter;
- and
- in response to detecting the loss of the AC input signal, deactivating the first switching signal and increasing a frequency of the second switching signal.
5 more elements
Dependencies are inferred from the claim text.