Efficiency improvement for power factor correction based ac-dc power adapters
AssigneeCypress Semiconductor Corporation
InventorsHariom RAI, Arun KHAMESRA, Aniket Shashikant MATHAD
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Abstract
Controlling power factor correction (PFC) in a secondary-controlled alternating current (AC) to direct current (DC) (AC-DC) power adapter is described. In one embodiment, an apparatus includes a transformer, a primary-side controller coupled to the transformer, a PFC component coupled to the primary-side controller, and a secondary-side controller coupled to the transformer. The secondary-side controller is configured at least to obtain data informative of an amount of power, and control, based on the amount of power, a PFC operating mode of the PFC component.
Claims20
An apparatus comprising:
- a transformer;
- a primary-side controller coupled to the transformer;
- a power factor correction (PFC) component coupled to the primary-side controller;
- and
- a secondary-side controller coupled to the transformer, wherein the secondary-side controller is configured at least to:
- obtain data informative of an amount of power;
- and
- control, based on the amount of power, a PFC operating mode of the PFC component.
A method comprising:
- obtaining, by a secondary-side controller of an alternating current (AC) to direct current (DC) (AC-DC) power adapter, data informative of an amount of power;
- and
- controlling, by the secondary-side controller based on the amount of power, a PFC operating mode of a PFC component of the AC-DC power adapter, wherein the PFC component is coupled to a primary-side controller of the AC-DC power adapter.
A secondary-side controlled (SSC) alternating current (AC) to direct current (DC) (AC-DC) power adapter comprising:
- an AC input;
- a rectifier component coupled to the AC input;
- a USB connector;
- a pulse transformer;
- a power factor correction (PFC) component;
- a primary-side field-effect transistor (FET);
- a secondary-side FET coupled to the USB connector;
- a primary-side controller coupled to the primary-side FET, the pulse transformer, and the PFC component;
- and
- a secondary-side controller coupled to the secondary-side FET, the pulse transformer, and the USB connector, wherein the secondary-side controller is configured at least to:
- obtain data informative of an amount of power;
- and
- control, based on the amount of power, a PFC operating mode of a PFC component of the AC-DC power adapter.
Dependencies are inferred from the claim text.