US 12,424,927 B2
Power conversion device with loss minimization and synchronized detection and switching frequency changing
Hayato Takeuchi, Tokyo (JP); Takato Toi, Tokyo (JP); and Takaharu Ishibashi, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 18/248,797
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Dec. 8, 2020, PCT No. PCT/JP2020/045601
§ 371(c)(1), (2) Date Apr. 12, 2023,
PCT Pub. No. WO2022/123646, PCT Pub. Date Jun. 16, 2022.
Prior Publication US 2023/0421051 A1, Dec. 28, 2023
Int. Cl. H02M 1/14 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/14 (2013.01) [H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power conversion device which converts an input voltage from a DC voltage source and outputs a resultant voltage as an output voltage, the power conversion device comprising:
a plurality of semiconductor switching elements connected between the DC voltage source and an output side, and connected in series with each other;
an inductor connected between the DC voltage source and the output side;
a controller which controls a switching frequency of each of the plurality of semiconductor switching elements; and
a detector which performs detection of a voltage value of the input voltage, a voltage value of the output voltage, and a current value of an inductor current flowing through the inductor, wherein
the controller includes
a voltage controller which calculates an output voltage command value on the basis of the voltage value of the input voltage and the voltage value of the output voltage which have been obtained through the detection,
a frequency controller which calculates a frequency command value on the basis of the voltage value of the input voltage, the voltage value of the output voltage, the current value of an inductor current, and the output voltage command value, and
a carrier generator which generates a carrier on the basis of the frequency command value, and
detection by the detector and changing of the switching frequency by the controller are each set to be performed at a timing that allows synchronization with the carrier on the basis of the carrier.