US 12,224,621 B2
Power supply device
Hidenobu Tajima, Chuo-ku (JP)
Assigned to TMEIC Corporation, Chuo-ku (JP)
Appl. No. 17/615,178
Filed by TMEIC Corporation, Chuo-ku (JP)
PCT Filed Dec. 26, 2019, PCT No. PCT/JP2019/051214
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2021/130981, PCT Pub. Date Jul. 1, 2021.
Prior Publication US 2022/0239146 A1, Jul. 28, 2022
Int. Cl. H02J 9/06 (2006.01); H02J 7/00 (2006.01); H02M 1/14 (2006.01)
CPC H02J 9/062 (2013.01) [H02J 7/0047 (2013.01); H02M 1/14 (2013.01); H02J 2207/20 (2020.01)] 8 Claims
OG exemplary drawing
 
1. A power supply device comprising:
an inverter that converts DC power into AC power and supplies the AC power to a load;
a voltage converter that performs voltage conversion for a DC voltage from a battery;
a capacitor that smoothes the DC voltage from the voltage converter and inputs the smoothed DC voltage to the inverter;
a current detector that detects a battery current flowing from the battery into the voltage converter;
a counter that measures a discharge time of the battery; and
a controller that controls the voltage converter, wherein
the controller stops the voltage converter when the measured discharge time of the battery exceeds a discharge permissible time, and
when the battery current exceeds a threshold value during discharging of the battery, the controller sets the discharge permissible time based on an output from the current detector such that the discharge permissible time is shorter as the battery current is higher.