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公开(公告)号：US11171574B2
公开(公告)日：2021-11-09
申请号：US16616777
申请日：2018-04-02
IPC分类号： H02M7/48
摘要： To provide a power conversion device capable of estimating a load voltage with high accuracy without directly detecting the load voltage to be applied to a load, a control circuit includes an estimator for estimating the load voltage to be applied to the load based on an electric current of a resonant circuit, an AC frequency of an inverter and an electrostatic capacitance of the load, or an estimator for estimating the load voltage based on the electric current of the resonant circuit, the AC frequency of the inverter, an inductance of a resonant coil and a correction coefficient previously set from a relationship between a voltage of the resonant coil and the load voltage, and which controls an output to a target load voltage based on the estimated load voltage.
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公开(公告)号：US10522978B2
公开(公告)日：2019-12-31
申请号：US15769120
申请日：2016-10-07
发明人： Taichiro Tamida , Takahiro Inoue , Takashi Hashimoto , Akira Nakagawa , Tomokazu Sakashita , Takayoshi Nagai , Kimihiko Tanaya , Hiroyuki Kameda , Yuichi Yamada , Kenji Ban
摘要： In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.
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3.发明授权公开(公告)号：US11527947B2
公开(公告)日：2022-12-13
申请号：US17257868
申请日：2019-05-14
发明人： Hiroyasu Iwabuki , Tomokazu Sakashita , Ryota Kondo , Takaaki Takahara , Hiroto Mizutani , Takuya Nakanishi , Yusuke Higaki
摘要： An output terminal of a contact type charger connected to an AC power supply 1 and being for boosting or stepping down an input voltage, and an output terminal of a non-contact type charger for receiving power in a non-contact manner are connected to an input terminal of a DC/DC converter via an integrated bus, a DC link capacitor is connected between an AC/DC converter and an isolated DC/DC converter included in the contact type charger, an integrated capacitor is connected to the integrated bus, and a control circuit adjusts a DC voltage of the DC link capacitor or the integrated capacitor such that at least one of power losses or a total power loss of the contact type charger, the non-contact type charger, and the DC/DC converter is reduced.
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公开(公告)号：US10516337B2
公开(公告)日：2019-12-24
申请号：US16310906
申请日：2017-04-13
摘要： A DC voltage conversion circuit in which the miniaturization of the inductor is attained and the frequency of control band can be widened, by suppressing the ripple current which flows into the inductor using a general magnetic core without using a special multi-leg magnetic core. A DC voltage conversion circuit is provided with two sets of magnetic flux cancellation conversion circuits each of which is provided with two sets of series circuits of two semiconductor circuits, a first magnetic flux cancellation type transformer, and a inductor; a second magnetic flux cancellation type transformer connected to the two sets of magnetic flux cancellation conversion circuits; and a control circuit which controls switching devices of semiconductor circuits.
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公开(公告)号：US12040716B2
公开(公告)日：2024-07-16
申请号：US17642704
申请日：2019-11-21
CPC分类号： H02M3/1586 , H02M1/0048
摘要： A DC/DC converter includes N converters connected in parallel and each having an inductor, a switching element, and a reverse-flow preventing element. Each converter is controlled at phases different from each other and such that a sum of switching frequencies F is out of a first non-selected frequency band. The inductor has an inductance that decreases as the switching frequency F increases. The switching element is controlled using the switching frequency F higher than a second non-selected frequency band of which upper and lower limit frequencies are 1/N of upper and lower limit frequencies of the first non-selected frequency band, and has a total gate charge such that a total loss is smaller than that in a case where the switching frequency F is set to be lower than the second non-selected frequency band.
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公开(公告)号：US11936304B2
公开(公告)日：2024-03-19
申请号：US17049583
申请日：2018-06-14
发明人： Satoshi Ojika , Tomokazu Sakashita
CPC分类号： H02M3/33592 , F03H1/00 , H02M1/0054 , H02M3/33584
摘要： The DC/DC converter circuit includes: a primary-side circuit configured to convert DC power from a DC power source into a pulse voltage; an isolation transformer configured to transform the pulse voltage while isolating the pulse voltage; a secondary-side circuit connectable in a switching manner by a switching circuit to one of a rectifier circuit for a high-voltage low-current output mode or a current doubler circuit for a low-voltage high-current output mode; and a control circuit configured to perform connection switching control of the switching circuit so as to establish, depending on target supply power, connection to the rectifier circuit in the high-voltage low-current output mode, and connection to the current doubler circuit in the low-voltage high-current output mode.
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公开(公告)号：US10907606B2
公开(公告)日：2021-02-02
申请号：US16646151
申请日：2018-05-24
摘要： An ignition device according to the present invention includes: an ignition plug, which includes a first electrode, a second electrode, and a dielectric body arranged between the electrodes; an AC power supply configured to generate an AC voltage to be applied between the electrodes; a thermal plasma detection portion configured to output a thermal plasma occurrence signal when thermal plasma has occurred between the electrodes; and an application time period determination portion configured to determine an application time period for the AC voltage during one cycle of the internal combustion engine in advance before the application, and when the thermal plasma occurrence signal is received while the AC voltage is being applied based on the application time period, change the application time period so as to shorten the application time period.
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公开(公告)号：US11462946B2
公开(公告)日：2022-10-04
申请号：US17257585
申请日：2019-07-05
摘要： A first converter performs power conversion and outputs AC power. The AC power outputted from the first converter is supplied to a first coil. The first coil is magnetically coupled with a second coil, and the AC power is transmitted from the first coil to the second coil. A second converter is connected to the second coil, and converts the AC power transmitted to the second coil to DC power and supplies the DC power to a load. A first control unit controls the first converter so as to alternately switch between a first state of outputting rectangular wave voltage which cyclically changes and a second state of outputting constant reference voltage, on the basis of required power of the load.
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公开(公告)号：US11070054B2
公开(公告)日：2021-07-20
申请号：US16070931
申请日：2016-02-26
摘要： A power controller includes: a plurality of switching elements provided in one-to-one correspondence with a plurality of power supplies, and each of which switches on or off to switch between supplying and stopping supplying a load with electric power from a corresponding one of the plurality of power supplies; a processing unit which computes an operation amount for adjusting an amount of the electric power supplied to the load; and a signal generator which determines, for each control, a switching-element count indicating a total number of switching elements to be turned on among the plurality of switching elements, and a duty ratio of the switching-element count, based on the operation amount, and generates a drive signal for driving the plurality of switching elements successively, based on the switching-element count and the duty ratio.
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公开(公告)号：US09709017B2
公开(公告)日：2017-07-18
申请号：US14894139
申请日：2014-05-30
CPC分类号： F02P7/077 , F02P3/01 , F02P3/02 , F02P3/0442 , F02P3/0876 , F02P9/002 , F02P9/007 , F02P23/045 , H01T15/00
摘要： In an ignition device of a spark-ignition internal combustion engine that performs ignition with high energy efficiency while reducing power to be input to a spark plug, after a DC-voltage-pulse generation circuit that generates a DC voltage pulse between electrodes of a spark plug is operated by a control circuit, an AC-pulse generation circuit that generates an AC pulse between the electrodes of the spark plug is operated. Furthermore, the control circuit controls the AC-pulse generation circuit with a plurality of group pulses and quiescent periods between the group pulses are provided.
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