Patent ID: 11869602
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 5:
6. An auxiliary power supply circuit comprising:
an auxiliary power monitoring circuit configured to receive an external power through a first power line and to provide the received external power or an auxiliary power to a solid state drive (SSD) through a second power line; and
a charging circuit including at least one capacitor and connected to the auxiliary power monitoring circuit,
wherein the auxiliary power monitoring circuit comprises:
switching circuit configured to electrically connect the first power line to the second power line;
a converter configured to convert the external power to a charging voltage and to provide the charging voltage to the charging circuit; and
a voltage monitoring circuit configured to control the converter based on capacitance of the charging circuit,
wherein the auxiliary power supply circuit is configured such that the voltage monitoring circuit controls the converter to provide:
a first charging voltage to the charging circuit when the capacitance of the charging circuit is equal to or greater than a first reference capacitance, and
a second charging voltage higher than the first charging voltage to the charging circuit when the capacitance of the charging circuit is less than the first reference capacitance,
wherein, when sudden power off (SPO) occurs and the external power is not normally supplied to the auxiliary power monitoring circuit through the first power line, the auxiliary power supply circuit is configured such that:
the auxiliary power monitoring circuit provides the auxiliary power through the second power line to the SSD for retaining data stored in the SSD, and
the switching circuit blocks the external power from being output to the second power line, and
wherein the auxiliary power is generated based on the capacitance of the charging circuit.