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Patent Agency Ranking
公开(公告)号：US11038429B2
公开(公告)日：2021-06-15
申请号：US16498573
申请日：2018-01-18
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Tadashi Sato , Norio Fukui
Abstract: An insulation-type switching power supply according to the present invention includes: a PWM control circuit that generates and outputs a PWM pulse and a PWM pulse respectively by alternately extracting pulses of a PWM control pulse signal at a field-effect transistor in a flyback converter circuit; a pulse transformer; a bidirectional excitation circuit that excites a primary winding of the pulse transformer in the forward direction using the PWM pulse and excites the primary winding of the pulse transformer in the reverse direction using the PWM pulse; and a switching circuit that generates a pulse signal by inverting a negative pulse of a pulse signal, induced in a secondary winding of the pulse transformer, to a positive pulse and switches the field-effect transistor by using the generated pulse signal.
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公开(公告)号：US20190199197A1
公开(公告)日：2019-06-27
申请号：US16226260
申请日：2018-12-19
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Tadashi Sato , Norio Fukui
Abstract: A switching power supply includes an insulated transformer, a full-bridge circuit which converts input DC power into AC power and outputs the AC power to a primary-side coil, an output circuit which converts AC power input from secondary-side coils into DC power and outputs the DC power, and a control circuit which controls the full-bridge circuit by using a phase shift method based on voltage output by the output circuit. When a measured value of the amount of phase shift determined from at least one of the voltage and current output by the output circuit is smaller than a theoretical value of the amount of phase shift corresponding to the switching power supply operating in a continuous current mode, the control circuit prolongs dead time used in the full-bridge circuit in accordance with the difference between the measured value and the theoretical value.
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公开(公告)号：US10693362B2
公开(公告)日：2020-06-23
申请号：US16226260
申请日：2018-12-19
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Tadashi Sato , Norio Fukui
Abstract: A switching power supply includes an insulated transformer, a full-bridge circuit which converts input DC power into AC power and outputs the AC power to a primary-side coil, an output circuit which converts AC power input from secondary-side coils into DC power and outputs the DC power, and a control circuit which controls the full-bridge circuit by using a phase shift method based on voltage output by the output circuit. When a measured value of the amount of phase shift determined from at least one of the voltage and current output by the output circuit is smaller than a theoretical value of the amount of phase shift corresponding to the switching power supply operating in a continuous current mode, the control circuit prolongs dead time used in the full-bridge circuit in accordance with the difference between the measured value and the theoretical value.
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公开(公告)号：US20180040410A1
公开(公告)日：2018-02-08
申请号：US15555827
申请日：2016-02-25
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Tomoyuki Nagayoshi , Tadashi Sato , Norio Fukui
CPC classification number: H01F27/2804 , H01F30/10 , H01F2027/2809 , H01F2027/2819 , H02M1/00 , H02M3/28 , H02M3/33592 , H02M7/003 , H02M2001/0054 , H05K1/0262 , H05K1/144 , H05K1/16 , H05K1/165 , H05K2201/042 , H05K2201/086 , H05K2201/2036 , Y02B70/1491
Abstract: An isolated switching power supply of the present invention includes: a first circuit board provided with a pattern of a primary winding constituting an isolation transformer; a second circuit board provided with patterns of secondary windings constituting the isolation transformer, wherein a secondary winding pattern portion is arranged to face a primary winding pattern portion of the first circuit board at a predetermined interval; and a core inserted into the primary winding of the first circuit board and the secondary windings of the second circuit board and made of a magnetic body constituting the isolation transformer.
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公开(公告)号：US20210119543A1
公开(公告)日：2021-04-22
申请号：US16498573
申请日：2018-01-18
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Tadashi Sato , Norio Fukui
Abstract: An insulation-type switching power supply according to the present invention includes: a PWM control circuit that generates and outputs a PWM pulse and a PWM pulse respectively by alternately extracting pulses of a PWM control pulse signal at a field-effect transistor in a flyback converter circuit; a pulse transformer; a bidirectional excitation circuit that excites a primary winding of the pulse transformer in the forward direction using the PWM pulse and excites the primary winding of the pulse transformer in the reverse direction using the PWM pulse; and a switching circuit that generates a pulse signal by inverting a negative pulse of a pulse signal, induced in a secondary winding of the pulse transformer, to a positive pulse and switches the field-effect transistor by using the generated pulse signal.
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