US 11,894,713 B2
Power supply circuit providing control over adaptive charging and charging capability, power supply unit thereof, and charging control method thereof
Yi-Lun Shen, Taipei (TW)
Assigned to ARK MICROELECTRONIC CORP. LTD., Shenzhen (CN)
Filed by Ark Semiconductor Corp. Ltd., Shenzhen (CN)
Filed on Mar. 14, 2021, as Appl. No. 17/200,884.
Claims priority of application No. 109145697 (TW), filed on Dec. 23, 2020.
Prior Publication US 2022/0200323 A1, Jun. 23, 2022
Int. Cl. H02J 7/06 (2006.01); H02M 1/08 (2006.01); H02M 7/217 (2006.01)
CPC H02J 7/06 (2013.01) [H02M 1/08 (2013.01); H02M 7/217 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A power supply circuit comprising:
a rectifier circuit configured to receive an input voltage to generate a rectified energy;
a charging circuit coupled to the rectifier circuit, configured to receive the rectified energy, and having a modulation input terminal and an energy supply terminal, the modulation input terminal being configured to receive a control voltage, the charging circuit being configured to selectively output a charging energy at the energy supply terminal according to the control voltage, and stop outputting the charging energy when the rectified energy is higher than a power extraction threshold voltage, the outputted charging energy being positively correlated to the control voltage when the rectified energy is less than the power extraction threshold voltage;
a driving voltage adjustment circuit coupled to the modulation input terminal, and configured to receive an output voltage signal, and control the control voltage to be within a clamping voltage according to the output voltage signal;
a sampling and feedback circuit coupled to the energy supply terminal, and configured to generate the output voltage signal according to a voltage at the energy supply terminal; and
a storage circuit coupled to the energy supply terminal, and configured to store the charging energy to pull up the voltage at the energy supply terminal;
wherein when the voltage at the energy supply terminal is a lower voltage, the driving voltage adjustment circuit controls the clamping voltage to have a higher upper limit according to the output voltage signal corresponding to the lower voltage, when the voltage at the energy supply terminal is a higher voltage, the driving voltage adjustment circuit controls the clamping voltage to have a lower upper limit according to the output voltage signal corresponding to the higher voltage, wherein the lower voltage is lower than the higher voltage, and the higher upper limit is higher than the lower upper limit.