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公开(公告)号：US20220190647A1
公开(公告)日：2022-06-16
申请号：US17598337
申请日：2020-03-26
Inventor： Hiroyuki HOSOI , Hiroshi YAMAMOTO
Abstract: A power transmitting device includes: an inverter circuit; a power transmitting antenna connected to the inverter circuit, and being electromagnetically coupled to a power receiving antenna in a power receiving device to wirelessly transmit electric power thereto; a detector to detect an output voltage and an output current of the inverter circuit; and a control circuit to control the inverter circuit. The control circuit consecutively drives the inverter circuit at a plurality of frequencies, determines from among the plurality of frequencies a frequency at which a phase difference that is indicative of a lag of a phase of the output current relative to a phase of the output voltage becomes largest, and performs power transmission by driving the inverter circuit at an operating frequency that is based on the determined frequency.
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公开(公告)号：US20230268818A1
公开(公告)日：2023-08-24
申请号：US18166287
申请日：2023-02-08
Inventor： Hiroyuki HOSOI , Atsushi SEKI
CPC classification number: H02M1/0048 , H02M1/08 , H02M7/219 , H02M3/01 , H02M3/33573 , H02J7/02 , H02J2207/20
Abstract: A charging system according to the present disclosure includes an AC-DC converter, a DC-DC converter, and a control circuit. The AC-DC converter is connected between an input node and an intermediate node. The AC-DC converter is connectable to a power source via the input node. The DC-DC converter is connected between the intermediate node and an output node. The DC-DC converter is connectable to a battery via the output node. The control circuit is configured to control a voltage of the intermediate node so as to reduce a sum of a loss in the AC-DC converter and a loss in the DC-DC converter, in accordance with a first parameter, a second parameter, and a third parameter. The first parameter is related to input power of the AC-DC converter. The second parameter is related to output power of the DC-DC converter. The third parameter is related to an ambient temperature.
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公开(公告)号：US20240128886A1
公开(公告)日：2024-04-18
申请号：US18467507
申请日：2023-09-14
Inventor： Hiromu MATSUMOTO , Hiroyuki HOSOI
IPC: H02M7/04
CPC classification number: H02M7/04
Abstract: A power supply device is connectable to a single-phase AC power supply or a multi-phase AC power supply. The power supply device includes power conversion circuits, a relay circuit, and a processor. The relay circuit is capable of switching between a first state and a second state. In the first state, a power supply line of each phase of the multi-phase AC power supply is connected to a corresponding power conversion circuit. In the second state, a power supply line of the single-phase AC power supply is connected to two or more of the power conversion circuits. The processor controls output timing of a control signal for operating the relay circuit on the basis of a detected temperature. The output timing is controlled such that, the first state is switched to the second state at timing when an AC voltage of the single-phase AC power supply crosses zero.
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Patent Agency Ranking
公开(公告)号：US20220263418A1
公开(公告)日：2022-08-18
申请号：US17582608
申请日：2022-01-24
Inventor： Hiroyuki HOSOI
Abstract: A DC-DC converter includes a DC-AC conversion circuit, a transformer, rectifier circuits, smoothing circuits, and an output circuit. The DC-AC conversion circuit converts a DC input voltage to a primary-side AC voltage. The transformer includes a primary-side coil to which the primary-side AC voltage is applied, and secondary-side coils magnetically coupled to the primary-side coil. The rectifier circuits are provided in one-to-one correspondence with the secondary-side coils. Each of the rectifier circuits outputs a rectification voltage resulting from full-wave rectification on the secondary-side AC voltage output from the corresponding secondary-side coil out of the secondary-side coils. The smoothing circuits are provided in one-to-one correspondence with the rectifier circuits. Each of the smoothing circuits smooths the rectification voltage output from the corresponding rectifier circuit out of the rectifier circuits. The output circuit is connected to respective output terminals of the smoothing circuits. The output circuit outputs a DC output voltage.
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公开(公告)号：US20220140637A1
公开(公告)日：2022-05-05
申请号：US17433751
申请日：2020-02-26
Inventor： Hiroyuki HOSOI , Hiroshi YAMAMOTO
Abstract: Power transmission is properly stopped before an electrical storage device becomes fully charged. A power transmitting device includes two transmission electrodes and a power transmitting circuit to supply AC power to the two transmission electrodes. The power receiving device includes: two reception electrodes being respectively opposed to the two transmission electrodes to receive the AC power from the two transmission electrodes; a power receiving circuit to convert the AC power received by the two reception electrodes into DC power and to output the DC power; a charge-discharge control circuit to control charging and discharging of the electrical storage device; and an impedance adjustment circuit to change an input impedance in accordance with a charge state of the electrical storage device as detected by the charge-discharge control circuit. In response to a change in at least one of voltage and current occurring due to a change in the input impedance during power transmission, the power transmitting circuit stops supply of the AC power.
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公开(公告)号：US20240088794A1
公开(公告)日：2024-03-14
申请号：US18517386
申请日：2023-11-22
Inventor： Hiroyuki HOSOI , Hideki NAKATA
IPC: H02M3/335
CPC classification number: H02M3/33573 , H02M3/33576
Abstract: A DC-DC converter includes: a DC-AC conversion circuit that converts a DC input voltage into a primary AC voltage; a transformer including a primary coil to which the primary AC voltage is applied and generates a secondary AC voltage at a secondary coil; a rectifier circuit that outputs a rectified voltage obtained by full-wave rectifying the secondary AC voltage; a smoothing circuit that smooths the rectified voltage; and a control circuit that causes the rectifier circuit to perform rectification by a diode such that, in a free-wheeling period in which power of the input voltage is not transmitted to the transformer, a current does not flow via the rectifier circuit from a first intermediate terminal to a second intermediate terminal, the first and second intermediate terminals connected to the smoothing circuit, and a current flows via the rectifier circuit from the second intermediate terminal to the first intermediate terminal.
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公开(公告)号：US20220294345A1
公开(公告)日：2022-09-15
申请号：US17586295
申请日：2022-01-27
Inventor： Hiroyuki HOSOI
Abstract: A DC-DC converter outputs a DC output voltage between first and second output terminals, and includes: a conversion circuit that outputs an intermediate voltage obtained by performing power conversion on an input voltage, between first and second intermediate terminals; a first coil provided between the first intermediate terminal and the first output terminal; and a diode provided in series with a second coil. A DC voltage is applied to the second coil and the diode, with a polarity in a direction in which a reverse bias is applied to the diode. The first coil and the second coil are magnetically coupled such that a current is made flow through the second coil in a forward direction of the diode by mutual induction as a current flowing through the first coil in a direction from the first intermediate terminal to the first output terminal increases.
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公开(公告)号：US20220181910A1
公开(公告)日：2022-06-09
申请号：US17599238
申请日：2020-03-26
Inventor： Hiroyuki HOSOI , Hiroshi YAMAMOTO , Satoru KIKUCHI , Toru MATSUGI , Masanori AKINAKA , Akira NISHIKAWA
Abstract: A power receiving device includes: a power receiving antenna to wirelessly receive AC power from a power transmitting antenna in the power transmitting device; a power receiving circuit to convert the AC power received by the power receiving antenna into DC power and to output the DC power; an impedance adjustment circuit disposed on a transmission path between a load that utilizes the DC power and the power receiving antenna, the impedance adjustment circuit being capable of causing a change in input impedance thereof; and a power reception control circuit to control the impedance adjustment circuit. The power reception control circuit consecutively changes a value of the input impedance of the impedance adjustment circuit to a value selected from among a plurality of values, determines from among the plurality of values a value at which power to be supplied to the load becomes largest, and sets and maintains the input impedance at an operating impedance value that is based on the determined value.
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