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公开(公告)号：US20240291402A1
公开(公告)日：2024-08-29
申请号：US18573648
申请日：2021-06-29
发明人： Chihiro KAWAHARA , Kenichi MOROKUMA
IPC分类号： H02M7/5395 , H02M1/00 , H02M1/08
CPC分类号： H02M7/5395 , H02M1/0009 , H02M1/08
摘要： In a semiconductor device (100) that drives and controls a semiconductor element (10), a current control unit (1) is provided with a pulse current supply (20) for passing a current between a control terminal (G) and a negative electrode terminal (S) of the semiconductor element (10). A timing control unit (3) causes the pulse current supply (20) to output a pulsed current during an on-period after the semiconductor element shifts to an on state or during an off-period after the semiconductor element shifts to an off state. A temperature estimation unit (7) estimates the temperature of the semiconductor element (10) on the basis of changes in current and voltage due to current supply from the pulse current supply (20).
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2.发明公开公开(公告)号：US20240275265A1
公开(公告)日：2024-08-15
申请号：US18563920
申请日：2021-06-01
发明人： Kenichi MOROKUMA , Yoshiko TAMADA
CPC分类号： H02M1/08 , H02M1/0009 , H02M1/325
摘要： A power semiconductor element drive adjustment circuit is provided with a difference unit to calculate a difference value between a normalized value of the differential value of the collector-emitter voltage and a normalized value of the differential value of the collector current, a comparison unit to compare the difference value with a comparison reference value, a drive control unit to generate, on the basis of a comparison result of the comparison unit, a drive adjustment signal that adjusts a drive signal for the power semiconductor element, and a drive variable circuit to output, on the basis of the drive adjustment signal, the drive signal for the power semiconductor element.
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3.发明公开公开(公告)号：US20230198373A1
公开(公告)日：2023-06-22
申请号：US17927010
申请日：2020-07-14
发明人： Kenichi MOROKUMA , Takuya SAKAI
IPC分类号： H02M1/08
CPC分类号： H02M1/08 , H02M1/0048
摘要： A drive adjustment circuit for a power semiconductor element includes a differentiating circuit to differentiate a gate voltage of a power semiconductor element, a power supply to generate a comparison reference voltage, a comparator having a first input terminal connected to the differentiating circuit and a second input terminal receiving the comparison reference voltage, and a voltage adjusting circuit to adjust a gate voltage of the power semiconductor element based on an output of the comparator.
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公开(公告)号：US20230179196A1
公开(公告)日：2023-06-08
申请号：US17921367
申请日：2020-06-01
IPC分类号： H03K17/082 , H03K3/012
CPC分类号： H03K17/0822 , H03K3/012 , H03K2017/0806
摘要： A classification circuit generates first information for classifying an operating state of a power semiconductor element into one of a plurality of predetermined operating regions. A selector circuit generates second information for selecting a plurality of modes with different switching speeds, based on a user input. A characteristic control circuit stores a drive adjustment signal in advance for each of combinations of the operating regions and the modes and outputs the drive adjustment signal in a combination of one operating region and one mode that is selected in accordance with the first information and the second information. A gate drive circuit charges/discharges a gate at a charge rate and a discharge rate variably set in accordance with the drive adjustment signal from the characteristic control circuit, at the time of on/off of the power semiconductor element.
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公开(公告)号：US20170278811A1
公开(公告)日：2017-09-28
申请号：US15509126
申请日：2015-08-19
发明人： Kenichi SUGA , Takao TSURIMOTO , Hiroki SHIOTA , Kenichi MOROKUMA , Shoichi ORITA , Fumitaka TAMETANI , Takahiro INOUE , Shiori UOTA
CPC分类号： H01L24/03 , G11C11/34 , H01F27/2804 , H01F27/32 , H01F2027/2809 , H01L23/3738 , H01L23/62 , H01L23/645 , H01L25/162 , H01L25/18 , H04L1/0006 , H05K7/1432
摘要： A signal transmission insulating device includes: a first coil; a second coil opposing the first coil to form a transformer together with the first coil; a first insulating film provided between the opposing first coil and second coil and made of a first dielectric material; a second insulating film surrounding the first coil and made of a second dielectric material having a lower resistivity or a higher permittivity than the first dielectric material; and a third insulating film surrounding the second coil and made of a third dielectric material having a lower resistivity or a higher permittivity than the first dielectric material.
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公开(公告)号：US20210028702A1
公开(公告)日：2021-01-28
申请号：US17042190
申请日：2019-03-12
发明人： Kenichi MOROKUMA , Takuya SAKAI
摘要： A power semiconductor device protection circuit includes: a drive circuit that drives a power semiconductor device; a current detector which includes a first resistor and an inductor connected in parallel; and a detection circuit that detects a short-circuit condition of the power semiconductor device. One end of the first resistor and one end of the inductor are connected to one terminal of the power semiconductor device. The detection circuit detects the short-circuit condition of the power semiconductor device by comparing a voltage of the one terminal of the power semiconductor device, which changes as a function of current flow through the first resistor and the inductor, with a short-circuit detection voltage. A reference potential of the drive circuit is connected to the other end of the first resistor and the other end of the inductor.
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公开(公告)号：US20190222107A1
公开(公告)日：2019-07-18
申请号：US16321997
申请日：2017-05-18
发明人： Kenichi MOROKUMA , Motoki IMANISHI
IPC分类号： H02M1/08 , H02M7/12 , H03K17/691 , H03K19/0175 , H04L25/02 , H04B3/54
CPC分类号： H02M1/08 , H02M7/12 , H03K17/691 , H03K19/0175 , H04B3/54 , H04L25/02
摘要： A first circuit generates and outputs a transmission signal to a first end and a second end of a first coil in response to variation in logical value of an input first signal. A detection circuit detects a voltage signal generated at each of a first end and a second end and outputs a second signal which reflects the first signal based on a result of detection. A control circuit controls a voltage to be applied across opposing ends of each of a first diode and a second diode of a first rectifier circuit and a voltage to be applied to opposing ends of each of a third diode and a fourth diode of a second rectifier circuit.
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公开(公告)号：US20180175847A1
公开(公告)日：2018-06-21
申请号：US15579790
申请日：2016-05-12
发明人： Kenichi MOROKUMA , Jun TOMISAWA , Tetsuya UCHIDA , Shoichi ORITA
IPC分类号： H03K17/081 , H02M1/08
CPC分类号： H03K17/08104 , H02M1/08 , H03K17/0812 , H03K17/691
摘要： A first circuit outputs transmission signals that change between “H” and “L” in a period of an oscillation signal in addition to a transition time of an input signal when it changes to “H” or “L”. Control protection elements invalidate induced voltage signals obtained from transformers for first and second mask periods in response to transmission signals. Buffer circuits and Schmitt circuits generate a first signal and a second signal, each indicating “H” for a relatively long period, on the basis of “H” of the induced voltage signals. A control circuit invalidates the first signal and the second signal when both the first signal and the second signal indicate “H”.
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公开(公告)号：US20180013424A1
公开(公告)日：2018-01-11
申请号：US15543080
申请日：2016-01-12
发明人： Tetsuya UCHIDA , Kenichi MOROKUMA
IPC分类号： H03K17/691 , H03K3/3565 , H03K3/356 , H03K3/012 , H01L27/02 , H03K5/24 , H01L23/538
CPC分类号： H03K17/691 , H01L23/5386 , H01L27/0255 , H01L2224/48091 , H01L2224/48137 , H03K3/012 , H03K3/356104 , H03K3/3565 , H03K5/08 , H03K5/2481 , H04L25/0266 , H04L25/493 , H01L2924/00014
摘要： This invention, is concerning a signal voltage device, in which transformers 22a, 22b and a reception circuit 24 are formed on the same chip, and accordingly, no ESD protective element connected to a transformer connection terminal of the reception circuit 24 is required, and negative pulses generated in reception-side inductors 11 can be used in signal transmission. Signal transmission using both positive pulses and negative pulses is made possible as a result, and a stable signal transmission operation can be carried out even in a case where delay time varies in a signal detection circuit. Further, a reception circuit of low power consumption can be configured by using a single-ended Schmitt trigger circuit 14 in the signal detection circuit.
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公开(公告)号：US20180013419A1
公开(公告)日：2018-01-11
申请号：US15448184
申请日：2017-03-02
发明人： Motoki IMANISHI , Kenichi MOROKUMA
IPC分类号： H03K17/567 , H03K17/691 , H01L29/16
CPC分类号： H03K17/567 , H01L29/1608 , H03K5/1252 , H03K17/691 , H03K19/0175
摘要： A signal transmission device relating to a technique disclosed in the specification of the present application includes: an isolation transformer; an input-side circuit connected to an input side of the isolation transformer; and an output-side circuit connected to an output side of the isolation transformer. The output-side circuit includes a first differential circuit having a first input and a second input connected to the first terminal and the second terminal respectively. A reference potential of the first differential circuit is connected to the second terminal.
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