公开(公告)号：US20190020265A1

公开(公告)日：2019-01-17

申请号：US16029005

申请日：2018-07-06

申请人： TDK CORPORATION

发明人： Tomokazu IKARASHI

IPC分类号： H02M1/34 ,  H02M3/24

CPC分类号： H02M1/34 ,  H02M3/24 ,  H02M3/335 ,  H02M3/337 ,  H02M2001/0009 ,  H02M2001/346 ,  H02M2001/348

摘要： An electronic device includes a power converter and a current detector that is disposed at at least one position out of a primary-side position and a secondary-side position for the power converter and detects a current flowing at the at least one position. A snubber circuit including a capacitor is directly connected in parallel to both ends of the current detector.

公开(公告)号：US20180351449A1

公开(公告)日：2018-12-06

申请号：US15777958

申请日：2016-01-07

申请人： TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION

发明人： Keisuke HATTORI ,  Teruo YOSHINO ,  Tomohisa OKAMI

IPC分类号： H02M1/34 ,  H02M7/162

CPC分类号： H02M1/34 ,  H02M1/081 ,  H02M1/32 ,  H02M7/125 ,  H02M7/1623 ,  H02M7/1626 ,  H02M7/19 ,  H02M2001/348

摘要： An AC-DC conversion device that includes a major circuit portion and a control circuit is provided. The major circuit portion includes a converter in which multiple switch portions in a bridge connection include separately-excited switching elements and snubber circuits connected in parallel with the switching elements; and the major circuit portion is connected to an alternating current power supply and a direct current circuit and applies, to the direct current circuit, an alternating current voltage applied from the alternating current power supply by an ON of the multiple switch portions. The control circuit controls the voltage applied to the direct current circuit by controlling the ON timing of the multiple switch portions by inputting a control pulse to each of the multiple switch portions.

公开(公告)号：US20180323576A1

公开(公告)日：2018-11-08

申请号：US15954596

申请日：2018-04-17

申请人： Ian D. Crawford ,  Dwight E. Wildon

发明人： Ian D. Crawford ,  Dwight E. Wildon

IPC分类号： H01S5/042

CPC分类号： H01S5/0428 ,  G01S7/4814 ,  G01S7/484 ,  H02M1/088 ,  H02M1/32 ,  H02M3/156 ,  H02M3/158 ,  H02M3/335 ,  H02M2001/0048 ,  H02M2001/007 ,  H02M2001/348 ,  H03K17/04123 ,  H03K17/08104 ,  H03K17/691 ,  H05B33/0815

摘要： A current driver is disclosed which allows very short pulses at high currents to be generated for high power laser diodes. The parasitic inductance of the laser diode limits the speed at which the laser diode may be turned on and off. A high voltage is used to charge this inductance rapidly and maximize the rise time. The fall time is shortened by allowing a similar high voltage to be generated at turnoff without damage to the laser diode or switching components. A portion of the energy stored in the parasitic inductance may recovered to reduce drain on the power source, and to improve overall efficiency. The anode of the laser may be switched to ground at the end of a pulse.

公开(公告)号：US20180274122A1

公开(公告)日：2018-09-27

申请号：US15465110

申请日：2017-03-21

申请人： Rockwell Automation Technologies, Inc.

发明人： Nickolay N. Guskov ,  Gary L. Skibinski ,  Zhijun Liu ,  William Jonn Sarver

IPC分类号： C25D21/12 ,  C25D17/02

CPC分类号： C25D21/12 ,  C25D17/00 ,  C25D17/02 ,  H02M1/14 ,  H02M3/335 ,  H02M3/33507 ,  H02M7/06 ,  H02M7/5387 ,  H02M2001/007 ,  H02M2001/348

摘要： Electroplating and painting systems, methods and power converters are disclosed to provide regulated individual DC output signals to anode structures distributed in a plating solution in a tank to promote formation of plating material on a workpiece using a PWM inverter to generate a first AC signal, a sinewave filter to provide a filtered AC signal, a multiphase isolation transformer to provide a plurality of isolated AC signals, a multi-pulse diode bridge rectifier to provide a DC rectifier output signal, an output filter to provide a filtered DC rectifier output signal, and a blocking diode to provide the filtered DC rectifier output signal to the corresponding tank anode structure.

公开(公告)号：US20180248475A1

公开(公告)日：2018-08-30

申请号：US15757515

申请日：2016-09-13

申请人： TM4 Inc.

发明人： Maalainine EL YACOUBI ,  Marion NOURRY ,  Benoit BLANCHARD ST-JACQUES ,  Pascal FLEURY ,  Jean-Marc CYR ,  Mohammed AMAR

IPC分类号： H02M1/32 ,  H02M1/08 ,  H03K17/0812

CPC分类号： H02M1/32 ,  H02M1/08 ,  H02M3/158 ,  H02M7/5387 ,  H02M2001/0054 ,  H02M2001/344 ,  H02M2001/348 ,  H03K17/08128 ,  H03K17/0828

摘要： The present disclosure relates to a power converter configured for limiting switching overvoltage. The power converter comprises a bottom commutation cell that includes a bottom power electronic switch and a bottom compensation circuit connected to a bottom parasitic inductance. The bottom compensation circuit applies a sample of the voltage induced across the bottom parasitic inductance at turn-off of the bottom power electronic switch to the reference node of the bottom gate driver. The power converter also comprises a top commutation cell that includes top power electronic switch and a top compensation circuit connected to the bottom parasitic inductance. The top compensation circuit applies a sample of the voltage induced across the bottom parasitic emitter upon turn-off of the top power electronic switch to the reference node of the top gate driver. The top and bottom commutation cells are part of a loop, being connected at a junction of the collector of the bottom power electronic switch and the emitter of the top power electronic switch.

公开(公告)号：US10062685B2

公开(公告)日：2018-08-28

申请号：US15623210

申请日：2017-06-14

申请人： Alpha and Omega Semiconductor Incorporated

发明人： Sik Lui ,  Ji Pan

IPC分类号： H02M1/34 ,  H01L27/06 ,  H01L29/8605 ,  H01L29/66 ,  H01L29/40 ,  H01L49/02 ,  H01L29/94 ,  H01L29/78

CPC分类号： H01L27/0629 ,  H01L28/20 ,  H01L29/407 ,  H01L29/66181 ,  H01L29/66666 ,  H01L29/7803 ,  H01L29/7811 ,  H01L29/7813 ,  H01L29/8605 ,  H01L29/94 ,  H02M1/34 ,  H02M2001/348

摘要： Aspects of the present disclosure describe MOSFET devices that have snubber circuits. The snubber circuits comprise one or more resistors with a dynamically controllable resistance that is controlled by changes to a gate and/or drain potentials of the one or more MOSFET structures during switching events.

公开(公告)号：US20180234010A1

公开(公告)日：2018-08-16

申请号：US15749993

申请日：2015-10-15

申请人： MITSUBISHI ELECTRIC CORPORATION

发明人： Takumi UEMURA ,  Kota TERAMOTO

IPC分类号： H02M1/34 ,  H02M7/5387 ,  H02M1/36 ,  H02M3/155

CPC分类号： H02M1/34 ,  H02M1/36 ,  H02M3/155 ,  H02M3/158 ,  H02M3/1584 ,  H02M7/487 ,  H02M7/5387 ,  H02M2001/348

摘要： A power converter has: switching elements connected in parallel to each of primary-side filter capacitors, freewheel diodes connected in parallel to the switching elements, and snubber resistances connected in parallel to the switching elements. The controller causes stoppage of the power converter by turning off each of the switching elements. After stoppage of the power converter, the controller causes a discharge circuit to operate by turning on a thyristor, thereby discharging the primary-side filter capacitors. By discharging of the primary-side filter capacitors, a secondary-side filter capacitor is discharged via the freewheel diodes.

公开(公告)号：US20180138808A1

公开(公告)日：2018-05-17

申请号：US15705745

申请日：2017-09-15

申请人： Silanna Asia Pte Ltd

发明人： Marshall Stanley

IPC分类号： H02M1/34 ,  H02M3/158

CPC分类号： H02M1/34 ,  H02M3/1588 ,  H02M2001/348 ,  Y02B70/1466

摘要： Various methods and devices that involve snubber circuits for switching power converters are disclosed. An example power converter has a snubbing circuit. The snubber circuit comprises a bypass capacitor connecting an input node of the power converter to a ground node of the power converter, a decoupling capacitor that connects the input node of the power converter to a snubber node, and a snubbing resistor that connects the snubber node to the ground node. The snubbing resistor connects the decoupling capacitor to the ground node of the power converter. The snubbing resistor is greater than 1 ohm. The decoupling capacitor is greater than 5 nanofarads and less than 0.5 microfarads. The bypass capacitor is greater than 1 microfarads.

公开(公告)号：US20180097440A1

公开(公告)日：2018-04-05

申请号：US15819208

申请日：2017-11-21

申请人： FUJI ELECTRIC CO., LTD.

发明人： Haining Wang

IPC分类号： H02M1/34 ,  H02M7/5387 ,  H02M5/458

CPC分类号： H02M1/34 ,  H02M1/32 ,  H02M5/458 ,  H02M5/4585 ,  H02M7/48 ,  H02M7/53871 ,  H02M7/53875 ,  H02M2001/348

摘要： A power conversion device including: a power conversion circuit including a voltage control type first semiconductor switching element configured to convert DC power to polyphase AC power; a brake circuit including a voltage control type second semiconductor switching element configured to protect the power conversion circuit from an overvoltage applied to the power conversion circuit; a control circuit configured to control the first semiconductor switching element in the power conversion circuit and the second semiconductor switching element in the brake circuit; and a snubber circuit including a resistor and a capacitor that are connected between a negative potential side of the power conversion circuit and a negative potential side of the control circuit and are configured to suppress a surge voltage.

公开(公告)号：US09800166B2

公开(公告)日：2017-10-24

申请号：US15216701

申请日：2016-07-22

申请人： SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

发明人： Yung-I Chang ,  Kuo-Hsien Huang

IPC分类号： H02M3/335 ,  H02M1/00 ,  H02M1/34

CPC分类号： H02M3/33592 ,  H02M2001/0009 ,  H02M2001/0058 ,  H02M2001/348 ,  Y02B70/1475 ,  Y02B70/1491

摘要： A power converter and a control method therefor are provided. The power converter includes a transformer, synchronous rectifier and a control circuit. A primary side of the transformer receives an input voltage, and a secondary side of the transformer generates a sensing signal. The synchronous rectifier is coupled to the secondary side of the transformer. The control circuit receives the sensing signal and detects a changing slope of the sensing signal, and accordingly generates a control signal to control the synchronous rectifier to be turned on or turned off, so as to regulate an output voltage of the power converter.