US 11,870,382 B2
Matrix power conversion device and control method thereof
Ping-Heng Wu, Taoyuan (TW); Kai-Wei Hu, Taoyuan (TW); and Lei-Chung Hsing, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by Delta Electronics, Inc., Taoyuan (TW)
Filed on Jan. 18, 2022, as Appl. No. 17/577,953.
Claims priority of application No. 202111022954.9 (CN), filed on Sep. 1, 2021.
Prior Publication US 2023/0067581 A1, Mar. 2, 2023
Int. Cl. H02M 5/27 (2006.01); H02M 1/12 (2006.01); H02P 27/16 (2006.01); H02M 5/293 (2006.01); H02M 1/42 (2007.01)
CPC H02P 27/16 (2013.01) [H02M 1/4216 (2013.01); H02M 5/2932 (2021.05)] 11 Claims
OG exemplary drawing
 
1. A matrix power conversion device, coupled between a three-phase input power and a motor, wherein the matrix power conversion device comprises:
a plurality of three-phase switching modules, switching the three-phase input power to generate a three-phase output power, wherein each of the plurality of three-phase switching modules comprises a plurality of bidirectional switches, each of the plurality of bidirectional switches in each of the plurality of three-phase switching modules is connected to a corresponding input phase voltage of the three-phase input power, and each of the plurality of three-phase switching modules outputs a corresponding output phase voltage of the three-phase output power; and
a controller, acquiring all input phase voltages of the three-phase input power, and determining a maximum voltage, an intermediate voltage and a minimum voltage among all the input phase voltages to acquire a waveform of a control carrier wave in a switching cycle;
wherein the controller acquires output expected values corresponding to all output phase voltages of the three-phase output power;
wherein the controller compares the waveform of the control carrier wave with all the output expected values respectively for acquiring a turning-on time of each of the plurality of bidirectional switches;
wherein according to the turning-on time of each of the plurality of bidirectional switches, the controller controls the matrix power conversion device to switch the three-phase input power so as to change the three-phase output power for driving the motor,
wherein the waveform of the control carrier wave comprises a first linear carrier wave and a second linear carrier wave, and the controller is further configured to:
acquire a time ratio value according to the maximum voltage, the intermediate voltage and the minimum voltage;
multiply the switching cycle by the time ratio value to acquire a first switching interval of the switching cycle; and
subtract the first switching interval from the switching cycle to acquire a second switching interval of the switching cycle,
wherein the first switching interval is a cycle variation of the first linear carrier wave, and the second switching interval is a cycle variation of the second linear carrier wave, wherein the controller is further configured to:
select one of the input phase voltages with the largest absolute voltage value to be a base voltage command; and
identify whether the base voltage command is positive or negative, and determine a voltage variation of the first linear carrier wave and a voltage variation of the second linear carrier waves according to identifying result,
wherein if the controller identifies that the base voltage command is positive, the controller is further configured to:
calculate a first voltage difference between the maximum voltage and the intermediate voltage;
calculate a second voltage difference between the maximum voltage and the minimum voltage; and
calculate the time ratio value according to the first voltage difference, the second voltage difference, the intermediate voltage and the minimum voltage,
wherein when the base voltage command is positive, the first voltage difference is the voltage variation of the first linear carrier wave, and the second voltage difference is the voltage variation of the second linear carrier wave, wherein a slope of the first linear carrier wave is negative, and a slope of the second linear carrier wave is positive.