专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20190393796A1 SWITCHING POWER SUPPLY DEVICE AND SEMICONDUCTOR DEVICE 审中-公开
公开(公告)号：US20190393796A1
公开(公告)日：2019-12-26
申请号：US16447157
申请日：2019-06-20
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA , Yosuke FUKUMOTO
IPC分类号： H02M3/335 , H02H7/12
摘要： A switching power supply device has a switching output stage generating an output voltage from an input voltage by switching operation and a controller controlling the switching output stage based on a feedback voltage commensurate with the output voltage. The switching power supply device can perform switching suspension control whereby it stops switching operation on detecting a light-load condition based on the feedback voltage, though it restarts switching operation on detection of an overvoltage condition during suspension of switching operation.

2. 发明申请

US20180262183A1 OSCILLATOR 审中-公开
公开(公告)号：US20180262183A1
公开(公告)日：2018-09-13
申请号：US15912630
申请日：2018-03-06
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA
IPC分类号： H03K3/353 , H03K21/08 , H03K19/21 , H03M1/66
CPC分类号： H03K3/353 , H03K3/0231 , H03K19/21 , H03K21/08 , H03M1/66
摘要： Provided is an oscillator arranged to output an oscillation signal of an oscillation frequency having an increasing and decreasing component that increases and decreases in one period, and an offset component for each period.

3. 发明申请

US20230130933A1 SWITCHING CIRCUIT, DC/DC CONVERTER, AND CONTROL CIRCUIT OF DC/DC CONVERTER 有权
公开(公告)号：US20230130933A1
公开(公告)日：2023-04-27
申请号：US18048095
申请日：2022-10-20
申请人： ROHM Co., LTD.
发明人： Shun FUKUSHIMA
IPC分类号： H02M3/156 , H02M3/18 , H03K17/30
摘要： Provided is a switching circuit including an input terminal, a switching terminal, a ground terminal, a bootstrap terminal, a high side transistor connected to the input terminal and the switching terminal, a low side transistor connected to the switching terminal and the ground terminal, a bootstrap capacitor connected to the switching terminal and the bootstrap terminal, a bootstrap switch including a PMOS transistor, and a driver circuit that turns on the bootstrap switch in a period in which the low side transistor is on and that turns off the bootstrap switch in a period in which the low side transistor is off, in which the driver circuit includes a level shifter and a buffer, and the level shifter includes an output line, a first resistance, a first transistor, a second resistance, a third resistance, a second transistor, a third transistor, a first capacitor, and a fourth transistor.

4. 发明申请

US20210091671A1 SWITCHING POWER SUPPLY DEVICE 有权
公开(公告)号：US20210091671A1
公开(公告)日：2021-03-25
申请号：US17026595
申请日：2020-09-21
申请人： ROHM Co., LTD.
发明人： Shun FUKUSHIMA , Yosuke FUKUMOTO
IPC分类号： H02M3/158 , H02M1/08 , H02M3/157
摘要： A main control circuit includes a PWM comparator that compares a contrast voltage generated according to a feedback voltage with a ramp voltage having a periodically varying voltage value, and causes an output stage circuit to perform a switching action based on a result of the comparison in the PWM control. A feedback path switch is inserted in a feedback path for propagating a signal according to the feedback voltage to the PWM comparator. The main control circuit controls, upon switching from sleep control that stops the switching action to the PWM control, within a specific period equal to one or more periods of the PWM control, the feedback path switch off and sets a voltage within a variation range of the ramp voltage as an initial voltage for the contrast voltage to thereby start a switching action and controlling the feedback path switch on after the specific period.

5. 发明申请

US20180262098A1 STEP-UP/DOWN DC-DC CONVERTER 审中-公开
公开(公告)号：US20180262098A1
公开(公告)日：2018-09-13
申请号：US15917945
申请日：2018-03-12
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA
IPC分类号： H02M1/08 , H02M3/155
CPC分类号： H02M1/083 , H02M3/155 , H02M3/1582 , H02M2001/0032 , H02M2001/0058 , Y02B70/16
摘要： A switch controller performs first sleep operation, to which a transition from normal operation is made when a light load is detected, and second sleep operation, to which a transition is made after the first sleep operation. In the first sleep operation, a coil current is passed via a body diode of any of a plurality of transistors that is off to an input voltage side or to an output voltage side. In the second sleep operation, a current path from at least one of first and second connection nodes to ground is formed.

6. 发明申请

US20210036616A1 DC-DC CONVERTER 有权
公开(公告)号：US20210036616A1
公开(公告)日：2021-02-04
申请号：US17073721
申请日：2020-10-19
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA , Yuhei Yamaguchi
IPC分类号： H02M3/158 , H02M1/32 , H02M3/156 , H02M1/08
摘要： A DC-DC converter generates an output voltage from an input voltage through current-mode control output feedback control using a current sense signal commensurate with a sampled value obtained by sampling a coil current in a switching output stage, for example, at the midpoint of the ON period or the OFF period of the switching output stage.

7. 发明申请

US20200227101A1 CLOCK GENERATION CIRCUIT, SWITCHING POWER SUPPLY DEVICE, AND SEMICONDUCTOR DEVICE 审中-公开
公开(公告)号：US20200227101A1
公开(公告)日：2020-07-16
申请号：US16834708
申请日：2020-03-30
申请人： Rohm Co., Ltd.
发明人： Takehiro Yoshida , Shun FUKUSHIMA
IPC分类号： G11C7/22 , G11C16/30 , G06F1/04 , H03L7/081 , H03L7/14 , G11C16/12
摘要： A clock generation circuit, which generates an output clock using an external clock as a target clock, includes a circuit arranged to change the output clock to high level in synchronization with an up edge of the target clock, circuits arranged to generate first and second ramp voltages with a period of interval between neighboring up edges of the target clock, and a circuit arranged to hold a comparison voltage corresponding to a second ramp voltage when an up edge of the target clock occurs. The level of the output clock is changed from high level to low level based on a comparison result between the first ramp voltage and the comparison voltage.

8. 发明申请

US20180262110A1 DC-DC CONVERTER 审中-公开
公开(公告)号：US20180262110A1
公开(公告)日：2018-09-13
申请号：US15916350
申请日：2018-03-09
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA , Yuhei YAMAGUCHI
IPC分类号： H02M3/158 , H02M1/08 , H02M1/32
CPC分类号： H02M3/158 , H02M1/08 , H02M1/32 , H02M3/156 , H02M2001/0009 , H02M2001/0025 , H02M2001/0035 , Y02B70/16
摘要： A DC-DC converter generates an output voltage from an input voltage through current-mode control output feedback control using a current sense signal commensurate with a sampled value obtained by sampling a coil current in a switching output stage, for example, at the midpoint of the ON period or the OFF period of the switching output stage.

9. 发明申请

US20180183338A1 Phase Compensation Circuit and DC/DC Converter Using the Same 审中-公开
公开(公告)号：US20180183338A1
公开(公告)日：2018-06-28
申请号：US15849138
申请日：2017-12-20
申请人： Rohm Co., Ltd.
发明人： Shun FUKUSHIMA , Shingo HASHIGUCHI , Tetsuo TATEISHI
IPC分类号： H02M3/158 , H02M3/06 , H03G1/00 , H03K7/08 , H02M1/084 , G05F1/575
CPC分类号： H02M3/1588 , G05F1/575 , H02M1/084 , H02M3/06 , H02M3/156 , H02M2001/0032 , H03G1/0094 , H03K7/08 , Y02B70/1466 , Y02B70/16
摘要： A phase compensation circuit, being for compensating phase of a first voltage inputted to a PWM comparator of a DC/DC converter having a sleep mode, includes: a phase compensation resistor part including a resistor; a phase compensation capacitor part including a plurality of capacitors; and a switch group arranged to change over the capacitors, in the sleep mode, to a first connection state in which at least one of the capacitors is charged with a first bias voltage and to change over the capacitors, at cancellation of the sleep mode, to a second connection state in which the first voltage is set to a desired initial value.

10. 发明申请

US20150326123A1 DC/DC CONVERTER, CONTROL CIRCUIT AND CONTROL METHOD THEREOF, AND ELECTRONIC APPARATUS 有权
标题翻译： DC / DC转换器，控制电路及其控制方法和电子设备
公开(公告)号：US20150326123A1
公开(公告)日：2015-11-12
申请号：US14704234
申请日：2015-05-05
申请人： ROHM CO., LTD.
发明人： Shun FUKUSHIMA , Osamu YANAGIDA
IPC分类号： H02M3/158
CPC分类号： H02M3/156 , H02M3/158 , H02M2001/0009 , H02M2001/0032 , Y02B70/16
摘要： A control circuit of a DC/DC converter is disclosed. The control circuit includes a pulse modulator generating a comparison pulse, which is transitioned to an on level when a feedback voltage depending on an output voltage of the converter is lowered to a threshold voltage and then transitioned to an off level; a peak current detector asserting a detection signal when a coil current of the converter reaches a predetermined peak current; a logic part generating a control pulse which is transitioned to an on level when the comparison pulse is transitioned to the on level, and is transitioned to an off level at a time which is later among the time when the comparison pulse is transitioned to the off level and the time when the peak current detection signal is asserted; and a driver switching a switching transistor of the converter based on the control pulse.
摘要翻译：公开了一种DC / DC转换器的控制电路。所述控制电路包括产生比较脉冲的脉冲调制器，当根据所述转换器的输出电压的反馈电压降低到阈值电压然后转换到关闭电平时，所述脉冲调制器转变为导通电平; 峰值电流检测器，当转换器的线圈电流达到预定的峰值电流时，确定检测信号; 产生控制脉冲的逻辑部分，当比较脉冲转换到导通电平时，转换到导通电平，并且在比较脉冲转换到关闭时间之后的时间过渡到关闭电平电平和峰值电流检测信号被断言的时间; 以及基于所述控制脉冲切换所述转换器的开关晶体管的驱动器。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式