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1. 发明授权

US11303206B2 Semiconductor device and load control system 有权
公开(公告)号：US11303206B2
公开(公告)日：2022-04-12
申请号：US16707948
申请日：2019-12-09
申请人： Rohm Co., Ltd.
发明人： Natsuki Yamamoto , Satoru Nate
IPC分类号： H02M3/156 , H02M3/335 , H03K17/691 , H03K17/60
摘要： A semiconductor device disposed on a primary side of a system generating a secondary side voltage in an insulated form from a primary side voltage includes: a signal generation circuit configured to generate a voltage information signal for transmitting voltage information based on the primary side voltage to a secondary side of the system in the insulated form.

2. 发明申请

US20220034946A1 ZERO-CROSSING DETECTION CIRCUIT 有权
公开(公告)号：US20220034946A1
公开(公告)日：2022-02-03
申请号：US17499138
申请日：2021-10-12
申请人： Rohm Co., Ltd.
发明人： Satoru Nate , Akinobu Sawada , Natsuki Yamamoto
IPC分类号： G01R19/175 , H02M1/08 , H03K5/1536
摘要： A zero-crossing detection circuit includes a zero-crossing detection unit arranged to compare a first monitoring target signal and a second monitoring target signal respectively input through diodes from a first node and a second node between which an AC signal is applied, so as to generate a first comparison signal, and a logic unit arranged to estimate a zero cross of the AC signal from the first comparison signal so as to generate a zero-crossing detection signal. The zero-crossing detection circuit preferably includes a monitoring unit arranged to adjust the first monitoring target signal and the second monitoring target signal to be suitable for input to the zero-crossing detection unit. The logic unit preferably counts a period of the first comparison signal and estimates a zero cross of the AC signal using a count value thereof.

3. 发明申请

US20190207522A1 POWER CONTROL DEVICE 审中-公开
公开(公告)号：US20190207522A1
公开(公告)日：2019-07-04
申请号：US16232442
申请日：2018-12-26
申请人： Rohm Co., Ltd.
发明人： Yoshinori Sato , Satoru Nate , Yuta SHIROISHI
IPC分类号： H02M3/335 , H02M1/08
CPC分类号： H02M3/33523 , H02M1/08 , H02M2001/0025 , H02M2001/0032
摘要： A power control device that acts as a principal controlling agent in an isolating switching power supply has a controller configured to monitor a first output detection signal commensurate with a direct-current output voltage to a load and a second output detection signal commensurate with the difference between the direct-current output voltage and its target value switch among a plurality of operating modes with varying power consumption according to the results of monitoring of the two output detection signals. The power control device may instead have a peak current switch configured to raise the peak current value of a primary current passing in an output switch on detecting a light load.

4. 发明授权

US09231483B2 DC/DC converter 有权
标题翻译： DC / DC转换器
公开(公告)号：US09231483B2
公开(公告)日：2016-01-05
申请号：US13950838
申请日：2013-10-15
申请人： ROHM CO., LTD.
发明人： Satoru Nate
IPC分类号： H02M3/335 , H02M1/00
CPC分类号： H02M3/33515 , H02M3/33507 , H02M2001/0035 , Y02B70/16
摘要： A pulse modulator generates a pulse modulation signal SPM having a duty ratio which is adjusted according to a feedback voltage Vfb that corresponds to the output voltage VOUT of a DC/DC converter. A second oscillator generates a second cyclic signal which is asserted with each of a predetermined second period. A light load detection circuit generates a light load detection signal which is asserted when the feedback voltage Vfb becomes lower than a first threshold voltage. A driving circuit drives a switching transistor according to the pulse modulation signal SPM. Furthermore, the driving circuit suspends the driving of the switching transistor during a period until the second cyclic signal is next asserted after the light load detection signal is asserted.
摘要翻译：脉冲调制器产生具有根据对应于DC / DC转换器的输出电压VOUT的反馈电压Vfb进行调整的占空比的脉冲调制信号SPM。第二振荡器产生第二循环信号，其以预定的第二周期中的每一个被断言。轻负载检测电路产生当反馈电压Vfb低于第一阈值电压时被断言的轻负载检测信号。驱动电路根据脉冲调制信号SPM驱动开关晶体管。此外，驱动电路在轻负载检测信号被断言之后的一段时间内暂停开关晶体管的驱动，直到第二循环信号下一次被断言。

5. 发明授权

US11637489B2 Isolated DC/DC converter and AC/DC converter 有权
公开(公告)号：US11637489B2
公开(公告)日：2023-04-25
申请号：US17539294
申请日：2021-12-01
申请人： ROHM Co., LTD.
发明人： Yifei Tang , Satoru Nate
IPC分类号： H02M3/335 , H02M1/00 , H02M7/217 , H02M3/157
摘要： There is provided an isolated DC/DC converter including a primary side control circuit disposed on the primary side and switching a switching element connected in series with a primary side winding of a power transformer; a secondary side control circuit disposed on the secondary side and generating a control signal including first control information and second control information on the basis of the secondary side voltage; and an insulated transmission circuit transmitting, in an insulated manner, each piece of control information included in the control signal to the primary side control circuit. The primary side control circuit controls a switching frequency of the switching element on the basis of the first control information indicating the frequency of the control signal, and controls a peak value of a primary side current on the basis of the second control information indicating the pulse width of the control signal.

6. 发明申请

US20210099091A1 CURRENT SENSE CIRCUIT 有权
公开(公告)号：US20210099091A1
公开(公告)日：2021-04-01
申请号：US16634631
申请日：2018-05-24
申请人： Rohm Co., Ltd.
发明人： Yoshinori Sato , Satoru Nate
IPC分类号： H02M3/335 , H03K17/687 , H02M1/00 , G01R19/165
摘要： A current limiter 200 (corresponding to an example of a current detection circuit) has a comparator 210 and a variable delay unit 220. The comparator 210 switches a comparison signal OCP from a low level to a high level when the current to be monitored, which flows through an output switch, reaches a predetermined threshold value (in the present figure, when a sense voltage Vcs reaches an overcurrent detection voltage Vocp). The variable delay unit 220 measures a first time T1 from when the output switch turns on by SET=H until when the comparison signal OCP switches to the high level and delays the comparison signal OCP by a second time T2 (=K·T12) proportional to the square of the first time T1 to generate an overcurrent detection signal Sc. The variable delay unit 220 includes a first timer 223 for measuring the first time T1 and a second timer 224 for generating the overcurrent detection signal Sc by delaying the comparison signal OCP by the second time T2.

7. 发明授权

US10957636B2 Semiconductor device 有权
公开(公告)号：US10957636B2
公开(公告)日：2021-03-23
申请号：US16588463
申请日：2019-09-30
申请人： Rohm Co., Ltd.
发明人： Makoto Hirata , Shingo Matsumaru , Satoru Nate
IPC分类号： H01L23/495 , H01L23/31 , H01L23/00 , H01L25/16
摘要： A semiconductor device includes leads, a switching element, a control element that controls the switching element, and a resin member covering the switching element, the control element and parts of the respective leads. The leads include a drain lead connected to a drain electrode of the switching element, a source lead connected to a source electrode of the switching element, and at least one control lead connected to the control element. The resin member includes a drain exposed portion at which the drain lead is exposed, a source exposed portion at which the source lead is exposed, and a control exposed portion at which the control lead is exposed. The distance in a first direction between the drain exposed portion and the source exposed portion is larger than the distance in the first direction between the control exposed portion and the source exposed portion.

8. 发明申请

US20200251991A1 POWER IC 审中-公开
公开(公告)号：US20200251991A1
公开(公告)日：2020-08-06
申请号：US16650639
申请日：2018-08-28
申请人： Rohm Co., Ltd.
发明人： Satoru Nate , Yoshinori Sato
IPC分类号： H02M3/335 , H02M1/42 , H02M1/08
摘要： This power supply IC is a semiconductor integrated circuit device serving as a main part for controlling a switching power supply and is formed by integrating a feedback resistor and an output feedback control unit on a single semiconductor substrate, said feedback resistor generating a feedback voltage by dividing the output voltage of the switching power supply (or the induced voltage appearing across an auxiliary winding provided on the primary side of a transformer included in an insulation-type switching power supply), said output feedback control unit performing output feedback control of the switching power supply in accordance with the feedback voltage. The feedback resistor is a polysilicon resistor having a withstand voltage of 100 V or more. A high-voltage region having higher withstand voltage in the substrate thickness direction than the other region is formed in the semiconductor substrate, and the feedback resistor is formed on the high-voltage region.

9. 发明授权

US09577511B2 PFC DC/AC/DC power converter with reduced power loss 有权
标题翻译： PFC DC / AC / DC电源转换器，降低功耗
公开(公告)号：US09577511B2
公开(公告)日：2017-02-21
申请号：US14570234
申请日：2014-12-15
申请人： ROHM CO., LTD.
发明人： Satoru Nate , Hiroshi Hayashi
IPC分类号： H02M3/335 , H02M1/42 , H02J9/00 , H02M1/00
CPC分类号： H02M1/42 , H02J9/005 , H02M1/4225 , H02M3/33507 , H02M3/33569 , H02M2001/0032 , H02M2001/007 , Y02B70/126 , Y02B70/16
摘要： A second control circuit is configured to switch a pulse signal to a level which turns off a second switching transistor when a coil current that flows through a primary winding reaches a predetermined threshold current. The second control circuit is configured to start a switching operation when a power supply for an electronic device is turned on, to set the threshold current to a first value when an intermediate voltage is higher than a predetermined level, and to set the threshold current to a second value that is lower than the first value when the intermediate voltage is lower than a predetermined level. A first control circuit is configured to start a switching operation upon receiving an instruction from a microcontroller to start operating.
摘要翻译：第二控制电路被配置为当流过初级绕组的线圈电流达到预定阈值电流时，将脉冲信号切换到关闭第二开关晶体管的电平。第二控制电路被配置为当电子设备的电源接通时开始切换操作，当中间电压高于预定电平时将阈值电流设置为第一值，并将阈值电流设置为当所述中间电压低于预定电平时，所述第二值低于所述第一值。第一控制电路被配置为在从微控制器接收到开始操作的指令时开始切换操作。

10. 发明授权

US09190916B2 DC/DC converter, control circuit and control method thereof, power supply, power adapter and electronic apparatus using the same 有权
标题翻译： DC / DC转换器，控制电路及其控制方法，电源，电源适配器及使用其的电子设备
公开(公告)号：US09190916B2
公开(公告)日：2015-11-17
申请号：US14023983
申请日：2013-09-11
申请人： ROHM CO., LTD.
发明人： Yoshinori Sato , Satoru Nate
IPC分类号： H02M3/335
CPC分类号： H02M3/33515 , H02M3/33507
摘要： A control circuit of a DC/DC converter includes: a pulse modulator configured to generate a pulse signal; and a driver configured to switch a switching transistor based on the pulse signal. The pulse modulator includes an on signal generator to generate an on signal. The on signal generator includes: a bottom detection comparator configured to compare a voltage of one end of an auxiliary winding with a predetermined threshold voltage and generate a bottom detection signal; a first time-out circuit configured to generate a first time-out signal asserted when the bottom detection signal is not asserted; a second time-out circuit configured to generate a second time-out signal asserted when the bottom detection signal is not asserted; and a logic part configured to generate the on signal based on the bottom detection signal, the first time-out signal and the second time-out signal.
摘要翻译： DC / DC转换器的控制电路包括：脉冲调制器，被配置为产生脉冲信号; 以及配置为基于脉冲信号切换开关晶体管的驱动器。脉冲调制器包括一个接通信号发生器，用于产生接通信号。导通信号发生器包括：底部检测比较器，被配置为将辅助绕组的一端的电压与预定阈值电压进行比较，并产生底部检测信号; 第一超时电路，被配置为当所述底部检测信号未被置位时产生被确定的第一超时信号; 第二超时电路，被配置为当所述底部检测信号未被置位时产生所述第二超时信号; 以及逻辑部分，被配置为基于所述底部检测信号，所述第一超时信号和所述第二超时信号来产生所述接通信号。

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