US 12,224,678 B2
Power converter and heat pump system provided therewith
Reiji Kawashima, Osaka (JP); Masaki Kono, Osaka (JP); and Masahide Fujiwara, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 27, 2023, as Appl. No. 18/126,892.
Application 18/126,892 is a continuation of application No. PCT/JP2021/035881, filed on Sep. 29, 2021.
Claims priority of application No. 2020-163992 (JP), filed on Sep. 29, 2020.
Prior Publication US 2023/0246561 A1, Aug. 3, 2023
Int. Cl. H02M 5/458 (2006.01); H02M 1/00 (2007.01); H02M 1/088 (2006.01); H02M 1/12 (2006.01); H02M 1/44 (2007.01); H02M 7/219 (2006.01); H02P 27/06 (2006.01)
CPC H02M 5/4585 (2013.01) [H02M 1/0009 (2021.05); H02M 1/088 (2013.01); H02M 1/12 (2013.01); H02M 1/44 (2013.01); H02M 7/219 (2013.01); H02P 27/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power converter comprising:
a power conversion unit that performs power conversion for a three-phase alternating current output from an alternating-current power source; and
a current compensation unit that supplies a compensating current to the alternating-current power source, the current compensation unit including
a current compensation unit inverter including a plurality of switching elements,
a current compensation unit capacitor connected between direct-current-side nodes of the current compensation unit inverter,
a current compensation unit reactor connected between the alternating current side of the current compensation unit inverter and the alternating-current power source,
a compensation controller that obtains an output voltage command value such that a harmonic component contained in a power-source current supplied to the power converter from the alternating-current power source is reduced by the compensating current, and
a drive signal generator that generates, based on the output voltage command value, a drive signal usable to drive the switching elements by a three-phase modulation method,
the current compensation unit inverter supplying, by switching operation of the switching elements, the compensating current to the alternating-current power source via the current compensation unit reactor, and
Td≤(34.00/fsw−0.145)(1.55−0.055*Pmax), where
fsw represents a carrier frequency employed for generation of the drive signal,
Pmax represents a maximum input power of the power conversion unit, and
Td represents a dead time for the drive signal.