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US 2016/0105095 A1Published application
Pfc shutdown circuit for light load
AssigneePower Integrations, Inc.
InventorsRobert J. Mayell, Bala Sudhakar Singamaneni
Life of this patent
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Abstract
A power converter includes a front end stage having a power factor correction controller, an output stage with a DC/DC controller, and light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage. In response to the detection, the power factor correction controller in the front end stage is turned off.
Claims38
A power converter comprising:
- a front end stage comprising a power factor correction controller;
- an output stage comprising a DC/DC controller;
- and
- light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the output stage and, in response to the detection, turn off the power factor correction controller in the front end stage.
1 more element
A power converter comprising:
- a boost power factor correction stage comprising a power factor correction controller;
- a DC/DC stage comprising a DC/DC controller;
- and
- light load detection circuitry coupled to detect relatively low power consumption by a load on an output of the DC/DC stage and, in response to the detection, turn off the power factor correction controller in the boost power factor correction stage.
1 more element
A power converter comprising:
- a rectifier coupled to rectify an input AC signal and output a first DC signal having a first peak amplitude;
- a power factor correction front end stage configured to,
- in a first state, receive the first DC signal output from the rectifier and output a second DC signal having a larger peak amplitude than the first peak amplitude, and
- in a second state, receive the first DC signal and output a third DC signal having a smaller peak amplitude than the first peak amplitude;
- an output stage coupled to receive either the second DC signal or the third DC signal from the power factor correction front end stage and output a regulated DC signal to power a load;
- and
- load detection circuitry coupled to output a low load signal in response to detection of relatively low power consumption by the load, the power factor correction front end stage configured to switch into the second state in response to the low load signal.
4 more elements
Dependencies are inferred from the claim text.