公开(公告)号：US20220271650A1

公开(公告)日：2022-08-25

申请号：US17628692

申请日：2019-08-09

Applicant: OMRON Corporation

Inventor： Hiroki ISHIBASHI ,  Hiroyuki ONISHI

IPC: H02M1/42 ,  H02M3/155 ,  H02M7/12 ,  H02M1/00

Abstract: A control circuit is provided for a power converter apparatus including a PFC circuit with an inductor and operating in a current critical mode. The control circuit includes: a first detector circuit that detects an inductor current, amplifies a voltage corresponding to a detected current with a gain, and outputs the voltage as a detected voltage; a comparator that compares the detected voltage with a reference voltage, and outputs a comparison result signal; a second detector circuit that detects an input voltage; and a third detector circuit that detects an output voltage. The control circuit calculates a reference voltage for making a delay on detecting zero value of the inductor current be substantially zero, based on the input voltage, the detected output voltage, a preset delay time, an inductance, a conversion coefficient on current-to-voltage converting, a power supply voltage, and the gain, and outputs the reference voltage to the comparator.

公开(公告)号：US20220255415A1

公开(公告)日：2022-08-11

申请号：US17629259

申请日：2020-07-27

Applicant: OMRON Corporation

Inventor： Hiroki ISHIBASHI ,  Hiroyuki ONISHI ,  Shingo NAGAOKA

IPC: H02M1/00 ,  H02M3/157 ,  H02M1/42

Abstract: In a power converter apparatus including a PFC circuit operating in a current-critical mode, a zero point of an inductor current is accurately detected. The control circuit includes a current detector unit including a first detection circuit that detects an inductor current, amplifies a voltage corresponding to the detected current with a gain, and outputs it as a detection voltage and a comparison circuit that compares the detected voltage with a predetermined reference voltage and outputs a comparison result signal. The control circuit calculates the reference voltage for making a delay when detecting the zero value of the inductor current substantially zero, based on the detected input voltage, the detected output voltage, the preset delay time, the inductance value of the inductor, the conversion factor in current/voltage converting, the power supply voltage, and the gain, and then, outputs it to the comparison circuit.

公开(公告)号：US20200007044A1

公开(公告)日：2020-01-02

申请号：US16482718

申请日：2017-11-20

Applicant: OMRON Corporation

Inventor： Mitsuru SATO ,  Shingo NAGAOKA ,  Hiroyuki ONISHI

IPC: H02M3/335 ,  H02M1/08

Abstract: The LLC resonant converter includes a bridge circuit configured to receive a DC input voltage, an LLC resonant circuit connected to the bridge circuit, a transformer connected to the LLC resonant circuit, a rectifier circuit connected to the transformer and configured to send out a converted DC voltage, a resonant capacitor changeover circuit, a bridge circuit control section, and a resonant capacitor changeover control section. When the input voltage exceeds a changeover voltage, the operating frequency is raised higher than the resonance frequency, and thereafter the switch is turned off.

公开(公告)号：US20180048229A1

公开(公告)日：2018-02-15

申请号：US15784326

申请日：2017-10-16

Applicant: OMRON Corporation

Inventor： Shingo NAGAOKA ,  Hiroyuki ONISHI ,  Takeo NISHIKAWA

IPC: H02M3/155 ,  H02M7/217 ,  H02M5/293 ,  H02M1/32 ,  H02M7/00 ,  H02M3/335 ,  H05K7/20

CPC classification number: H02M3/155 ,  H01L23/34 ,  H02M1/12 ,  H02M1/32 ,  H02M1/4258 ,  H02M3/33592 ,  H02M5/293 ,  H02M7/003 ,  H02M7/217 ,  H02M2001/0006 ,  H02M2001/123 ,  H02M2007/4835 ,  H05K7/20

Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A conductive member of the noise eliminator is connected to a stable potential.

公开(公告)号：US20190068065A1

公开(公告)日：2019-02-28

申请号：US15892369

申请日：2018-02-08

Applicant: OMRON Corporation

Inventor： Kohei TANINO ,  Shingo NAGAOKA ,  Mitsuru SATO ,  Masaaki NAGANO ,  Hiroyuki ONISHI

IPC: H02M3/335 ,  H02M1/40

Abstract: Provided is an LLC resonant converter capable of achieving high efficiency while preventing saturation of a transformer. The LLC resonant converter includes semiconductor switches connected in series between a positive electrode and a negative electrode of a power source, a transformer including a primary winding, a core, and a secondary winding, a capacitor connected between the negative electrode of the power source and a second end of the primary winding of the transformer, a capacitor, and semiconductor switches connected to each other in series and in parallel with the capacitor, and a secondary side circuit connected to the secondary winding of the transformer, wherein the transformer is a swing choke coil.

公开(公告)号：US20180042104A1

公开(公告)日：2018-02-08

申请号：US15785563

申请日：2017-10-17

Applicant: OMRON Corporation

Inventor： Shingo NAGAOKA ,  Hiroyuki ONISHI ,  Takeo NISHIKAWA ,  Kentaro HAMANA

IPC: H05K1/02 ,  H01L23/433 ,  H05K1/18

CPC classification number: H05K1/0216 ,  H01L23/36 ,  H01L23/4332 ,  H01L23/5222 ,  H02M1/44 ,  H02M3/155 ,  H02M7/48 ,  H05K1/0209 ,  H05K1/181 ,  H05K2201/0311 ,  H05K2201/066 ,  H05K2201/0792 ,  H05K2201/10166 ,  H05K2201/10265 ,  H05K2201/10356 ,  H05K2201/10628 ,  H05K2201/10757

Abstract: Provided is a power converter which is applied to a power converter equipped with a switching element provided on a line, and a radiator connected to a predetermined potential such as a ground potential. A noise eliminator in which a conductive member is covered with insulator is provided between the switching element (semiconductor switch) and the radiator (heatsink). A flexible connecting line connected to a conductive member of the noise eliminator is connected to an on-board line disposed on a circuit board.