US 12,334,809 B2
Power supply shut-off control device
Toshiki Asai, Tokyo (JP); and Akihiro Tsumura, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/245,428
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 18, 2020, PCT No. PCT/JP2020/043035
§ 371(c)(1), (2) Date Mar. 15, 2023,
PCT Pub. No. WO2022/107252, PCT Pub. Date May 27, 2022.
Prior Publication US 2023/0353038 A1, Nov. 2, 2023
Int. Cl. H02M 1/32 (2007.01); H02M 1/00 (2006.01); H02M 1/08 (2006.01); H02M 7/537 (2006.01); H02M 7/5387 (2007.01); H03K 17/14 (2006.01); H03K 17/0812 (2006.01)
CPC H02M 1/08 (2013.01) [H02M 1/0009 (2021.05); H02M 1/32 (2013.01); H02M 1/325 (2021.05); H02M 1/327 (2021.05); H02M 7/537 (2013.01); H02M 7/53871 (2013.01); H03K 17/145 (2013.01); H03K 17/0812 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A power supply control device comprising:
a power conversion device configured to perform power conversion to supply power to an object for power supply;
a controller configured to control an operation of the power conversion device;
a current detection device configured to detect a current flowing through the object for power supply;
a comparison device configured to output a shut-off start signal of which a logic of output is inverted when a value of current detected by the current detection device is larger than a preset current threshold value;
a shut-off device configured to shut off, based on a shut-off control signal, a conversion operation signal output by the controller to the power conversion device;
a latch device configured to output the shut-off control signal based on the shut-off start signal output by the comparison device and to perform, until a latch release signal is input, a latch operation, in which the shut-off device is caused to maintain a state in which a conversion operation signal is shut off; and
a delay device configured to output a latch release signal after a delay time elapses since the latch device starts a latch operation, the delay time being determined by components of the delay device,
wherein the controller, when it is configured to judge that an abnormality occurs in at least one of the object for power supply and the power conversion device, is configured to stop outputting the conversion operation signal for a period of time during which output of a signal stops, and
the period of time during which the output of the signal stops is a time set by software executed by the controller, and is a time that is equal to or longer than a time from a point when the latch device starts the latch operation to a point when the latch release signal is output.