US 11,750,113 B2
Inverter device
Yuki Makimura, Isesaki (JP); Masataka Matsuda, Isesaki (JP); Shogo Fujisaki, Isesaki (JP); and Masatoshi Saito, Isesaki (JP)
Assigned to SANDEN CORPORATION, Isesaki (JP)
Appl. No. 17/600,770
Filed by SANDEN AUTOMOTIVE COMPONENTS CORPORATION, Isesaki (JP)
PCT Filed Apr. 14, 2020, PCT No. PCT/JP2020/016358
§ 371(c)(1), (2) Date Oct. 1, 2021,
PCT Pub. No. WO2020/226029, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 2019-087414 (JP), filed on May 7, 2019.
Prior Publication US 2022/0200482 A1, Jun. 23, 2022
Int. Cl. H02P 27/08 (2006.01); H02M 7/5387 (2007.01); H02P 29/68 (2016.01); H02M 1/14 (2006.01)
CPC H02M 7/5387 (2013.01) [H02M 1/14 (2013.01); H02P 27/08 (2013.01); H02P 29/68 (2016.02)] 20 Claims
OG exemplary drawing
 
1. An inverter device comprising:
an electrolytic capacitor which smooths an input voltage to generate a DC voltage;
an inverter circuit which generates an AC voltage from the DC voltage to drive an electric motor;
a temperature sensor which detects a temperature of the electrolytic capacitor or an ambient temperature of the electrolytic capacitor; and
a control device which controls the drive of a plurality of switching elements included in the inverter circuit,
wherein in the case where the temperature detected by the temperature sensor is lower than a predetermined temperature, the control device on-drives specific switching elements selected out of the switching elements before starting a normal operation of the electric motor to thereby execute a warming up operation of allowing a current that controls a ripple voltage of the DC voltage in the electrolytic capacitor within a permissible range to flow through the electric motor at a predetermined rate of increase while keeping the electric motor stopped.