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1. 发明授权

US09841805B2 Power management circuit and electronic device employing the same 有权
公开(公告)号：US09841805B2
公开(公告)日：2017-12-12
申请号：US14799016
申请日：2015-07-14
申请人： ROHM CO., LTD.
发明人： Kazuaki Shimada
IPC分类号： G06F1/00 , G06F1/32
CPC分类号： G06F1/324 , G06F1/26 , G06F1/3212 , G06F1/3293
摘要： A power management circuit that controls a plurality of power circuits for generating supply voltages at least for a processor is disclosed. The circuit includes: a real time clock that generates clock signals with a predetermined frequency; a power-on terminal to which a power-on key is connected, wherein the power-on terminal receives a voltage whose level depends on whether the power-on key is pressed or not; a power-on detecting unit that monitors a voltage at the power-on terminal and asserts a start signal if it is determined using the clock signals that the power-on key is pressed and held for a predetermined time period; and a power management controller that receives a system voltage based on a battery voltage or a DC voltage from a DC power source and, upon the start signal is asserted, starts up the plurality of power circuits in a predetermined sequence using the clock signals.

2. 发明申请

US20160018868A1 POWER MANAGEMENT CIRCUIT AND ELECTRONIC DEVICE EMPLOYING THE SAME 有权
标题翻译：电源管理电路和使用该电路的电子设备
公开(公告)号：US20160018868A1
公开(公告)日：2016-01-21
申请号：US14799016
申请日：2015-07-14
申请人： ROHM CO., LTD.
发明人： Kazuaki Shimada
IPC分类号： G06F1/32
CPC分类号： G06F1/324 , G06F1/26 , G06F1/3212 , G06F1/3293
摘要： A power management circuit that controls a plurality of power circuits for generating supply voltages at least for a processor is disclosed. The circuit includes: a real time clock that generates clock signals with a predetermined frequency; a power-on terminal to which a power-on key is connected, wherein the power-on terminal receives a voltage whose level depends on whether the power-on key is pressed or not; a power-on detecting unit that monitors a voltage at the power-on terminal and asserts a start signal if it is determined using the clock signals that the power-on key is pressed and held for a predetermined time period; and a power management controller that receives a system voltage based on a battery voltage or a DC voltage from a DC power source and, upon the start signal is asserted, starts up the plurality of power circuits in a predetermined sequence using the clock signals.
摘要翻译：公开了一种功率管理电路，其控制至少为处理器产生电源电压的多个电源电路。该电路包括：产生具有预定频率的时钟信号的实时时钟; 连接有上电键的上电端子，其中所述通电端子接收其电平取决于所述通电键是否被按下的电压; 上电检测单元，如果使用所述电源接通键被按下并保持预定时间段的时钟信号确定，则监视所述电源接通端子处的电压并断言起始信号; 以及功率管理控制器，其基于来自DC电源的电池电压或DC电压接收系统电压，并且在启动信号被断言时，使用时钟信号以预定的顺序启动多个电源电路。

3. 发明授权

US10079498B2 Charging circuit, power management circuit, and electronic device using the same 有权
公开(公告)号：US10079498B2
公开(公告)日：2018-09-18
申请号：US14692037
申请日：2015-04-21
申请人： ROHM CO., LTD.
发明人： Kazuaki Shimada
IPC分类号： H02J7/00 , H02H3/087 , H02H3/20 , H02H7/18
CPC分类号： H02J7/0052 , H02H3/087 , H02H3/202 , H02H7/18 , H02J7/0077 , H02J2007/0059
摘要： Charging circuit includes: DC input terminal; battery terminal; system terminal; first transistor; second transistor; gate controller for controlling turning on/off of first transistor; charging controller for controlling gate voltage of second transistor to control charging of secondary battery; overcurrent protection circuit for comparing an input current flowing in DC input terminal and first transistor with threshold current having multiple steps of values, and vary gate voltage such that on-resistance is increased when input current reaches threshold current; low-voltage detection circuit for comparing voltage at DC input terminal with predetermined threshold voltage, and decrease threshold current of overcurrent protection circuit by one step when voltage of DC input terminal is below predetermined threshold voltage; and DC power detecting unit for determining, when threshold current is at minimum value and voltage of DC input terminal is below threshold voltage, that DC power source is not connected to charging circuit.

4. 发明授权

US11569807B2 Voltage comparator circuit, power management circuit, electronic device 有权
公开(公告)号：US11569807B2
公开(公告)日：2023-01-31
申请号：US17583684
申请日：2022-01-25
申请人： ROHM CO., LTD.
发明人： Kazuaki Shimada
IPC分类号： H03F3/00 , H03K5/24 , H02M1/00
摘要： The present disclosure provides a voltage comparator circuit, a power management circuit and an electronic device. The voltage comparator circuit compares a voltage difference between a positive electrode input terminal and a negative electrode input terminal with a threshold voltage. An amplifier circuit includes a first input node and a second input node, and amplifies a voltage difference between the first input node and the second input node. The input switch circuit, in a first phase, applies a predetermined voltage of one of the positive electrode input terminal and the negative electrode input terminal to the first input node and the second input node of the amplifier circuit; and in a second phase, applies a voltage of the positive electrode input terminal to the first input node of the amplifier circuit, and applies a voltage of the negative electrode input terminal to the second input node.

5. 发明授权

US10862175B2 Battery fuel gauge circuit 有权
公开(公告)号：US10862175B2
公开(公告)日：2020-12-08
申请号：US15989415
申请日：2018-05-25
申请人： ROHM CO., LTD.
发明人： Kazuaki Shimada
IPC分类号： H02J7/00 , H01M10/42
摘要： A battery fuel gauge circuit is coupled to a rechargeable battery. A first A/D converter samples a voltage VBAT of the battery. A logic circuit receives the output of the first A/D converter. The logic circuit acquires the output of the first A/D converter when an electronic device mounting the battery fuel gauge circuit is turned on for the first time.

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