US 11,699,955 B2
Feedback voltage modulation to reduce power converter quiescent current
Aleksandar Radic, Toronto (CA)
Assigned to Silanna Asia Pte Ltd, Singapore (SG)
Filed by Silanna Asia Pte Ltd, Singapore (SG)
Filed on Jun. 14, 2022, as Appl. No. 17/806,872.
Claims priority of provisional application 63/202,679, filed on Jun. 21, 2021.
Prior Publication US 2022/0407424 A1, Dec. 22, 2022
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33523 (2013.01) [H02M 1/0032 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
determining, by a primary side controller of a power converter, that the power converter is in a no-load or ultra-light load mode of operation;
in response to determining that the power converter is in a no-load or ultra-light load mode of operation, allowing, by the primary side controller, a voltage amplitude of a feedback signal to rise towards a voltage amplitude that is greater than or equal to a first threshold voltage level;
upon determining, by the primary side controller, that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, issuing a first sequence of one or more enabling pulses to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal;
upon determining, by the primary side controller, that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, entering a normal mode of operation of the power converter; and
issuing, by the primary side controller, a second sequence of one or more enabling pulses to the primary side switch of the power converter during normal operation of the power converter;
wherein:
the voltage amplitude of the feedback signal is less than the first threshold voltage level during the normal mode of operation of the power converter.