US 11,923,757 B2
Electronic device for cutting off power
Changho Kim, Anyang-si (KR)
Appl. No. 17/609,881
Filed by Changho Kim, Anyang-si (KR)
PCT Filed May 8, 2020, PCT No. PCT/KR2020/006092
§ 371(c)(1), (2) Date Nov. 9, 2021,
PCT Pub. No. WO2020/226452, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 10-2019-0054029 (KR), filed on May 9, 2019; and application No. 10-2020-0038895 (KR), filed on Mar. 31, 2020.
Prior Publication US 2022/0216780 A1, Jul. 7, 2022
Int. Cl. H02M 1/00 (2006.01); H02J 9/00 (2006.01); H02M 1/08 (2006.01); H02M 3/155 (2006.01); H02M 7/06 (2006.01); H02M 1/32 (2007.01)
CPC H02M 1/0032 (2021.05) [H02J 9/00 (2013.01); H02M 1/0048 (2021.05); H02M 1/08 (2013.01); H02M 3/155 (2013.01); H02M 7/06 (2013.01); H02M 1/0054 (2021.05); H02M 1/327 (2021.05)] 15 Claims
OG exemplary drawing
 
1. An electronic device comprising:
a power converter configured to generate DC (direct current) power based on power obtained from outside;
a state detecting unit, comprising a first photo coupler and a first diode electrically connected with the first photo coupler, configured to detect a state of a user device that comprises the electronic device or is electrically connected with the electronic device;
a driving power supply unit configured to supply driving power for the user device based on the DC power;
a power cut-off unit, comprising a first field effect transistor (FET), configured to cut off the DC power provided to the driving power supply unit according to the state of the user device; and
a control unit electrically connected with the state detecting unit,
wherein the control unit is configured to:
in response to detecting, by the state detecting unit, the state of the user device is switched from a first designated state requiring application of the driving power to a second designated state requiring cut-off of the driving power, switch a state of a first signal from a first state to a second state to turn off a light emitting diode (LED) of the first photo coupler,
wherein a transistor of the first photo coupler is turned off based on turning off the LED of the first photo coupler,
wherein an anode and a cathode of the first diode is changed to a low state based on the turning-off of the transistor of the first photo coupler,
wherein the first FET of the power cut-off unit is turned off by changing a state of a gate of the first FET to a low state by changing the cathode of the first diode connected with the gate of the first FET to the low state, and
wherein the power cut-off unit is configured to cut off the DC power provided to the driving power supply unit based on the turning-off of the first FET.