US 12,308,775 B2
Motor drive device
Satoshi Furukawa, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/043,774
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Jul. 30, 2021, PCT No. PCT/JP2021/028260
§ 371(c)(1), (2) Date Mar. 2, 2023,
PCT Pub. No. WO2022/064840, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 2020-159133 (JP), filed on Sep. 23, 2020.
Prior Publication US 2023/0336103 A1, Oct. 19, 2023
Int. Cl. H02P 27/06 (2006.01); H02P 21/22 (2016.01)
CPC H02P 27/06 (2013.01) [H02P 21/22 (2016.02)] 4 Claims
OG exemplary drawing
 
1. A motor drive device that drives a motor using a three-phase alternating current as a power source, the motor drive device comprising:
a rectifier circuit that rectifies the three-phase alternating current to generate a rectified current;
a current detection circuit that detects the rectified current rectified by the rectifier circuit;
a cross point detection circuit that detects a cross point between the rectified current detected by the current detection circuit and a predetermined current value, counts a number of times of the detection of the cross point in one cycle of the three-phase alternating current, and outputs a control signal indicating whether or not to drive the motor based on the number of times of the detection of the cross point in one cycle of the three-phase alternating current; and
a power calculation circuit that calculates a power for driving the motor, wherein:
the cross point detection circuit outputs the control signal indicating that the motor is not to be driven in a case where the number of times of the detection of the cross point in one cycle of the three-phase alternating current is 2, and
the cross point detection circuit suppresses an output of the control signal indicating that the motor is not to be driven, in a case where a power calculated by the power calculation circuit is smaller than a predetermined power value.