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1. 发明授权

US09876426B2 On-period setting circuit, power control IC, and switching power supply device 有权
公开(公告)号：US09876426B2
公开(公告)日：2018-01-23
申请号：US15086215
申请日：2016-03-31
申请人： Rohm Co., Ltd.
发明人： Tetsuo Tateishi , Genki Tsuruyama
IPC分类号： H02M3/158 , H02M1/08 , H02M1/00
CPC分类号： H02M3/158 , H02M1/08 , H02M3/1588 , H02M2001/0009 , H02M2001/0032 , Y02B70/1466 , Y02B70/16
摘要： An ON-period setting circuit is provided in a fixed-ON-period switching power supply device that produces a desired output voltage from an input voltage by driving a coil by turning ON and OFF an output transistor and a synchronous rectification transistor. The ON-period setting circuit shortens the ON period the more the lighter the load is in a discontinuous-current mode. Or, the ON-period setting circuit transiently shortens the ON period on completion of a transition from a discontinuous-current mode to a continuous-current mode.

2. 发明授权

US11374556B2 Logic circuit, sequence circuit, power supply control circuit, switching power supply device 有权
公开(公告)号：US11374556B2
公开(公告)日：2022-06-28
申请号：US16753458
申请日：2018-10-01
申请人： Rohm Co., Ltd.
发明人： Genki Tsuruyama , Tetsuo Tateishi
IPC分类号： H02M3/156 , H03K3/017 , H03K5/04 , H03K5/153
摘要： A sequence circuit (1) includes a detector (2) that detects an occurrence of an event based on an input signal, an acceptor (4) that accepts the event whose occurrence has been detected by the detector, an inhibitor (4) that inhibits the acceptor from accepting another event for a first period using the acceptance of one event by the acceptor as a trigger, a clock pulse generator (3) that generates one or more clock pulses during a period after a second period shorter than the first period elapses from the start of the first period until the first period ends, a determiner (5) that determines a next state based on a current slate and the event accepted by the acceptor, and a latch (6) that latches the next state using the clock pulse. An output of the latch is the current state.

3. 发明授权

US10205393B2 Comparator circuit, power supply control IC, and switching power supply device 有权
公开(公告)号：US10205393B2
公开(公告)日：2019-02-12
申请号：US15918218
申请日：2018-03-12
申请人： Rohm Co., Ltd.
发明人： Genki Tsuruyama , Tetsuo Tateishi
IPC分类号： H02M3/157 , H02M3/158 , G01R19/00 , H02M3/156
摘要： A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).

4. 发明公开

US20230179097A1 Switching Power Device 审中-公开
公开(公告)号：US20230179097A1
公开(公告)日：2023-06-08
申请号：US18070836
申请日：2022-11-29
申请人： ROHM CO., LTD.
发明人： Genki Tsuruyama
IPC分类号： H02M3/158 , H02M1/08 , B60R16/02
CPC分类号： H02M3/158 , H02M1/083 , B60R16/02
摘要： The present disclosure provides a switching power device. A control unit of the switching power device includes a first state, a second state, a third state and a fourth state. In the first state, a first switch is turned on, and a second switch is turned off. In the second state, the first switch is turned off, and the second switch is turned on. In the third state, the first and second switches are turned off. In the fourth state, a voltage of a connection node of the first and second switches is less than that in the third state. The control unit repeats the first state, the second state, the third state, and the fourth state, and lengthens a period of the fourth state as an input voltage increases.

5. 发明授权

US10498243B2 Comparator circuit, power supply control IC, and switching power supply device 有权
公开(公告)号：US10498243B2
公开(公告)日：2019-12-03
申请号：US16166471
申请日：2018-10-22
申请人： Rohm Co., Ltd.
发明人： Genki Tsuruyama , Tetsuo Tateishi
IPC分类号： H02M3/158 , H03K5/24
CPC分类号： H02M3/1588 , H03K5/2472 , Y02B70/1466
摘要： A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.

6. 发明授权

US09954442B2 Comparator circuit, power supply control IC, and switching power supply device 有权
公开(公告)号：US09954442B2
公开(公告)日：2018-04-24
申请号：US15459100
申请日：2017-03-15
申请人： Rohm Co., Ltd.
发明人： Genki Tsuruyama , Tetsuo Tateishi
IPC分类号： H02M3/157 , H02M3/158
CPC分类号： H02M3/1588 , G01R19/0038 , H02M3/156
摘要： A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).

7. 发明申请

US20160224049A1 CONSTANT VOLTAGE GENERATING CIRCUIT 有权
标题翻译：恒电压发生电路
公开(公告)号：US20160224049A1
公开(公告)日：2016-08-04
申请号：US15012195
申请日：2016-02-01
申请人： ROHM CO., LTD.
发明人： Kiyotaka Umemoto , Genki Tsuruyama
IPC分类号： G05F3/08
CPC分类号： G05F3/08 , G05F3/24
摘要： A constant voltage generating circuit includes an ED-type reference voltage supply that generates a predetermined constant voltage by using a first transistor of depletion-type and a second transistor of enhancement-type that are connected in series between a power supply terminal and a ground terminal, and a third transistor a source of which is connected to an output terminal for the constant voltage, a drain of which is connected to the power supply terminal or the ground terminal, and a gate of which is connected to a connection node between the first transistor and the second transistor.
摘要翻译：恒定电压发生电路包括ED型参考电压源，其通过使用在电源端子和接地端子之间串联连接的耗尽型第一晶体管和增强型第二晶体管产生预定的恒定电压以及第三晶体管，源极连接到用于恒定电压的输出端子，其漏极连接到电源端子或接地端子，并且其栅极连接到第一和第二端子之间的连接节点晶体管和第二晶体管。

8. 发明申请

US20230013839A1 PULSE CONTROL DEVICE 有权
公开(公告)号：US20230013839A1
公开(公告)日：2023-01-19
申请号：US17946721
申请日：2022-09-16
申请人： Rohm Co., Ltd.
发明人： Hiroto OSHITA , Tetsuo Tateishi , Yosuke Fukumoto , Yuhei Yamaguchi , Yoju IMAMURA , Genki Tsuruyama
IPC分类号： H01H47/32 , H02M1/08 , H03K7/08
摘要： A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

9. 发明申请

US20200083009A1 PULSE CONTROL DEVICE 审中-公开
公开(公告)号：US20200083009A1
公开(公告)日：2020-03-12
申请号：US16469790
申请日：2018-01-29
申请人： Rohm Co., Ltd.
发明人： Hiroto OSHITA , Tetsuo Tateishi , Yosuke Fukumoto , Yuhei Yamaguchi , Yoju IMAMURA , Genki Tsuruyama
IPC分类号： H01H47/32 , H02M1/08 , H03K7/08
摘要： A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.

10. 发明授权

US10379564B2 Constant voltage generating circuit 有权
公开(公告)号：US10379564B2
公开(公告)日：2019-08-13
申请号：US15974880
申请日：2018-05-09
申请人： Rohm Co., Ltd.
发明人： Kiyotaka Umemoto , Genki Tsuruyama
IPC分类号： G05F3/08 , G05F3/24
摘要： A constant voltage generating circuit includes an ED-type reference voltage supply that generates a predetermined constant voltage by using a first transistor of depletion-type and a second transistor of enhancement-type that are connected in series between a power supply terminal and a ground terminal, and a third transistor a source of which is connected to an output terminal for the constant voltage, a drain of which is connected to the power supply terminal or the ground terminal, and a gate of which is connected to a connection node between the first transistor and the second transistor.

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