US 12,249,912 B2
Power control device and power supply system using the same
Yuta Suzuki, Toyota (JP); and Naoya Odashima, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Oct. 28, 2022, as Appl. No. 17/975,992.
Claims priority of application No. 2021-203318 (JP), filed on Dec. 15, 2021.
Prior Publication US 2023/0188036 A1, Jun. 15, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/32 (2007.01); H05K 7/20 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/32 (2013.01); H05K 7/209 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A power control device comprising:
a step-down converter configured to step down direct current power supplied from a direct current power source;
a temperature sensor configured to detect a temperature of the step-down converter or a temperature correlated with the temperature of the step-down converter; and
a control device configured to control operation of the step-down converter based on upper limit and lower limit target values for an output voltage of the step-down converter, wherein
the control device is further configured to:
change at least one of the upper limit target value and the lower limit target value in accordance with the detected temperature,
set the upper limit target value to a first value when the detected temperature is within a first temperature range,
set the upper limit target value to a second value lower than the first value when the detected temperature is within a second temperature range higher than the first temperature range,
set the lower limit target value to a third value when the detected temperature is within the first temperature range, and
set the lower limit target value to a fourth value lower than the third value when the detected temperature is within the second temperature range.