US 12,231,036 B2
Work machine
Akira Watanabe, Ushiku (JP); Yasunori Ota, Tsuchiura (JP); Yusuke Imai, Arakawa-ku (JP); and Manabu Yano, Nagareyama (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 17/629,674
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Sep. 2, 2020, PCT No. PCT/JP2020/033332
§ 371(c)(1), (2) Date Jan. 24, 2022,
PCT Pub. No. WO2021/059910, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-175691 (JP), filed on Sep. 26, 2019.
Prior Publication US 2022/0282456 A1, Sep. 8, 2022
Int. Cl. B60L 1/00 (2006.01); B60L 3/00 (2019.01); B60L 3/04 (2006.01); B60L 50/12 (2019.01); B60L 50/13 (2019.01); B60L 50/61 (2019.01); E02F 3/43 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01); E02F 9/26 (2006.01); F02D 29/00 (2006.01); F02D 29/02 (2006.01); F02D 29/04 (2006.01); F02D 41/06 (2006.01); H02M 1/00 (2007.01); H02M 1/10 (2006.01); H02M 1/14 (2006.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01); H02M 3/00 (2006.01); H02P 25/028 (2016.01); H02P 27/06 (2006.01); H02P 29/024 (2016.01); H02P 29/032 (2016.01)
CPC H02M 1/36 (2013.01) [E02F 9/2004 (2013.01); E02F 9/2075 (2013.01); E02F 9/2285 (2013.01); H02M 3/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A work machine comprising:
a controller that controls the work machine;
a low voltage power supply that supplies power to the controller;
a low voltage circuit provided with the low voltage power supply;
an electric drive source necessary for operating the work machine;
a high voltage power supply that supplies power to the electric drive source; and
a high voltage circuit provided with the high voltage power supply, wherein
the work machine further comprises:
a capacitor provided to the high voltage circuit;
a first precharge device provided between the low voltage circuit and the high voltage circuit; and
a second precharge device that is provided to the high voltage circuit and performs precharge of the capacitor by using power from the high voltage power supply, and
the controller is configured to:
perform precharge of the capacitor by using the second precharge device, and
perform precharge of the capacitor by boosting the power from the low voltage power supply using the first precharge device when precharge of the capacitor by using the second precharge device is impossible.