US 12,224,659 B2
Charging device and safety function control circuit and method thereof
Che-Min Lin, Taoyuan (TW); Kuo-Chieh Chan, Taoyuan (TW); Kuan-Jung Lee, Taoyuan (TW); Chi-Chang Lien, Taoyuan (TW); and Ching-Chia Chu, Taoyuan (TW)
Assigned to FSP TECHNOLOGY INC., Taoyuan (TW)
Filed by FSP TECHNOLOGY INC., Taoyuan (TW)
Filed on Jan. 30, 2023, as Appl. No. 18/102,784.
Claims priority of application No. 111105171 (TW), filed on Feb. 11, 2022.
Prior Publication US 2023/0261564 A1, Aug. 17, 2023
Int. Cl. H02J 7/00 (2006.01); H02M 1/32 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/325 (2021.05) [H02J 7/00308 (2020.01); H02M 3/33523 (2013.01); H02J 2207/20 (2020.01)] 17 Claims
OG exemplary drawing
 
1. A safety function control circuit for a charging device, the charging device comprising a power conversion circuit, a power connection terminal, a switch circuit coupled between the power connection terminal and the power conversion circuit, and a first control module coupled to the switch circuit, the power connection terminal and the power conversion circuit; a voltage detection section being defined between the switch circuit and the power conversion circuit, the first control module operating in a safe mode when the power connection terminal is not connected to a load; the safety function control circuit comprising:
a first constant voltage control zone, configured at the first control module, and coupled to a feedback control module of the power conversion circuit via a first control terminal of the first control module, wherein in the safe mode, the first control module generates, based on a comparison between a first predetermined voltage value and a first detection voltage value obtained from the voltage detection section, a first control signal used for a converted voltage value of the power conversion circuit to be lower than a safe voltage value; and
a second constant voltage control zone, comprising a second control module coupled to the power connection terminal, a second control terminal of the second control module being coupled to the feedback control module of the power conversion circuit, wherein in the safe mode, the second control module generates, based on a comparison between a second predetermined voltage value and a second detection voltage value obtained from the voltage detection section, a second control signal used for the converted voltage value of the power conversion circuit to be lower than the safe voltage value;
wherein in the safe mode, when the first control signal is not used for the converted voltage value of the power conversion circuit to be lower than the safe voltage value, the feedback control module is controlled by the second control signal, and
wherein in the safe mode, when the second control signal is not used for the converted voltage value of the power conversion circuit to be lower than the safe voltage value, the feedback control module is controlled by the first control signal.