US 12,261,514 B2
Zero standby power system
Won Tae Lee, Bucheon-si (KR); Won Ji Lee, Daejeon (KR); Chuen Sik Jung, Suwon-si (KR); and Gyu Won Lee, Guri-si (KR)
Assigned to POWER LSI CO., LTD., Daejeon (KR)
Filed by POWER LSI CO., LTD., Daejeon (KR)
Filed on Sep. 15, 2023, as Appl. No. 18/467,774.
Claims priority of application No. 10-2022-0167039 (KR), filed on Dec. 2, 2022.
Prior Publication US 2024/0186881 A1, Jun. 6, 2024
Int. Cl. H02M 1/00 (2007.01)
CPC H02M 1/0032 (2021.05) 12 Claims
OG exemplary drawing
 
1. A zero standby power system, comprising:
a power supply device comprising a plurality of power stages and disposed in a first side of a transformer;
a capacitor configured to supply electric power to one of the plurality of power stages;
an on/off controller disposed in a second side of the transformer and configured to receive an on/off signal from an external device; and
a zero standby power device configured to receive the on/off signal and to control connections respectively to the plurality of power stages based on the receive on/off signal,
wherein, when input power is applied, a relay switch is changed to be in an on state to charge the capacitor,
wherein the on/off controller is configured to obtain electric energy based on an operation of the one of the plurality of power stages and generates a signal for changing the relay switch to be in an off state and controls the relay switch to be repeatedly turned on and off through at least one photocoupler in order that a voltage for the on/off controller is maintained to have a predetermined level, and
wherein, when the capacitor has been discharged, the on/off controller generates a signal for changing the relay switch to be in the on state and controls the relay switch to be changed to be in the on state through the at least one photocoupler so that the capacitor can be re-charged.