US 10,892,688 B2
Switching power supply apparatus control method and control circuit of switching power supply apparatus
Jian Chen, Matsumoto (JP)
Assigned to FUJI ELECTRIC CO., LTD., Kawasaki (JP)
Filed by FUJI ELECTRIC CO., LTD., Kawasaki (JP)
Filed on Nov. 29, 2019, as Appl. No. 16/699,425.
Application 16/699,425 is a continuation of application No. PCT/JP2018/035934, filed on Sep. 27, 2018.
Claims priority of application No. 2017-233888 (JP), filed on Dec. 6, 2017.
Prior Publication US 2020/0099310 A1, Mar. 26, 2020
Int. Cl. H02M 3/335 (2006.01); H02M 1/38 (2007.01); H02M 1/00 (2006.01)
CPC H02M 3/33569 (2013.01) [H02M 1/38 (2013.01); H02M 2001/0009 (2013.01); H02M 2001/0058 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for controlling a switching power supply apparatus which includes a half-bridge circuit having a first high-side switching element and a second low-side switching element connected in series and a resonance circuit having a resonance inductor and a resonance capacitor, the method comprising:
detecting a resonance current of the resonance circuit;
acquiring a feedback signal indicative of an error between an output voltage and a target voltage from an output circuit which outputs a direct-current voltage;
calculating a resonance current after-inversion time, during a half cycle that extends from a time when one of the first high-side switching element or the second low-side switching element is turned off to a time when another of the first switching high-side element or the second low-side switching element is turned off, the calculating of the resonance current after-inversion time extending from a time when a polarity of the resonance current is inverted to a time when the half cycle ends, the calculating being based on a multiplication of time information obtained by performing counting from a time when the half cycle begins and a value of the feedback signal acquired at the time when the half cycle begins, and
turning off said other of the first high-side switching element or the second low-side switching element after the calculated resonance current after-inversion time has elapsed after the polarity of the resonance current is inverted.