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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：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：US20230083009A1
公开(公告)日：2023-03-16
申请号：US17760075
申请日：2021-01-27
Applicant: FDK CORPORATION
Inventor： Kenji Hamada
Abstract: A battery voltage equalization device 1 includes: a transformer T including a primary winding T1 into which the output voltage of a battery pack BP is inputted and a plurality of secondary windings T2 corresponding to each of batteries B; a conversion circuit 2 that converts an AC voltage outputted by the secondary windings T2 to a DC voltage; a cutoff circuit 3 provided to cut off a conductive pathway from the conversion circuit 2 to the batteries B; and a control unit 5 that controls the energization of the primary winding T1, wherein the cutoff circuit 3 includes a first switch SW1 and the second switch SW2 which are provided in series on the conductive pathway and which are opened or closed by the control unit, a first body diode Db1 and a second body diode Db2 of which the same terminals are connected to each other and which are respectively connected in parallel with the switches, and a surge suppression resistor Rss connected in parallel with the first body diode Db 1 or the second body diode Db2 for which the direction of charging current to the batteries B is the forward direction.
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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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Patent Agency Ranking
公开(公告)号：US20240217393A1
公开(公告)日：2024-07-04
申请号：US17907258
申请日：2021-01-27
Applicant: FDK CORPORATION
Inventor： Kenji Hamada
CPC classification number: B60L58/22 , B60L58/12 , H02J7/0047 , H02J7/00714 , H02J7/007194
Abstract: A battery voltage equalization device for an automotive battery formed from a plurality of batteries connected in series includes: a voltage measurement unit that measures respective battery voltages of the batteries; a current measurement unit that measures a charge-discharge current of the automotive battery; a cell balancing unit that equalizes the respective battery voltages of the batteries; and a control unit that performs a voltage equalization control through the cell balancing unit on the basis of the battery voltages measured by the voltage measurement unit. The control unit starts the voltage equalization control on the condition that the voltage equalization control is determined to be necessary on the basis of the respective battery voltages and that a discharge current of the automotive battery measured by the current measurement unit is determined to be stable.
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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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公开(公告)号：US10110021B2
公开(公告)日：2018-10-23
申请号：US14761516
申请日：2014-01-21
Applicant: FDK Corporation
Inventor： Kenji Hamada , Masatsuru Miyazaki
Abstract: There is provided a balancing device that equalizes voltages between storage cells of a battery composed of a plurality of series-connected storage cells or voltages between electrical storage modules composed of a plurality of series-connected storage cells of the battery. The balancing device equalizes voltages between the energy storage modules by transferring electric power between the electrical storage modules through an element to which all of the electrical storage modules are connected, the transferring being realized by on-off control of current supply to each of the electrical storage modules, the on-off control being performed with a first duty cycle. Further, the balancing device introduces a period in which the on-off control is performed with a second duty cycle, the second duty cycle being different from the first duty cycle. Furthermore, the balancing device measures a voltage applied to each of the capacitance elements C1 and C2 which connect between the terminals of the electrical storage modules respectively. Furthermore, the balancing device determines the presence of an open circuit in lines which connect the capacitance elements C1 and C2 and the electrical storage modules, the determination being performed based on change of the voltages during the period which are applied to the capacitance elements C1 and C2.
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公开(公告)号：US11196341B2
公开(公告)日：2021-12-07
申请号：US16771351
申请日：2018-09-25
Applicant: FDK CORPORATION
Inventor： Kenji Hamada , Toshio Shibata
Abstract: The switching power supply is provided with a voltage converter including a switching element for inputting a voltage from an input terminal, and has a spread spectrum function of varying a switching frequency in the switching element within a predetermined variation range. The switching power supply has a frequency setting unit that sets the variation range of the switching frequency and raises a lower limit value of the set variation range when a value of the voltage input from the input terminal is equal to or more than a predetermined threshold, and a signal generator that generates a control signal for driving the switching element by varying the switching frequency within the variation range set by the frequency setting unit.
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公开(公告)号：US10008863B2
公开(公告)日：2018-06-26
申请号：US15037145
申请日：2014-10-16
Applicant: FDK CORPORATION
Inventor： Kenji Hamada
CPC classification number: H02J7/0019 , B60L58/22 , B60L2210/10 , B60L2240/547 , H02J7/007 , H02J7/345 , Y02T10/7005 , Y02T10/7055 , Y02T10/7061 , Y02T10/7216
Abstract: In a balance correction circuit including a plurality of converter type balance correction units that control a supply of a current to a plurality of power storage cells by complementarily on/off controlling two switching elements and hereby allowing to exchange power between or among power storage cells via an inductor to equalize the voltages of the power storage cells, a common timing signal used to generate a control signal of a switching element is supplied to each of the above balance correction units. For example, the balance correction circuit generates a timing signal to supply to a first balance correction unit based on a variation in a voltage applied to the capacitive element charged by a voltage difference created between a control signal generated by the second balance correction unit and a second power storage cell cathode of the balance correction unit.
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