公开(公告)号：US09673656B2

公开(公告)日：2017-06-06

申请号：US14711307

申请日：2015-05-13

Applicant: Seiko Instruments Inc.

Inventor： Takashi Ono ,  Toshiyuki Koike ,  Satoshi Abe ,  Fumihiko Maetani

IPC: H02J7/00

CPC classification number: H02J7/0072 ,  H02J7/0029 ,  H02J2007/0039

Abstract: Provided is a highly safe battery device in which the accuracy of an overcurrent detection current value and a short-circuit current value is improved and current consumption is reduced. A short-circuit and overcurrent detecting circuit includes: a reference voltage circuit configured to output a reference voltage generated when a constant current flows through an impedance element and a transistor having a resistance value that is changed depending on a voltage of a secondary battery; a first comparator circuit configured to compare a voltage of an overcurrent detecting terminal with the reference voltage; and a second comparator circuit configured to compare a voltage based on the voltage of the overcurrent detecting terminal with the reference voltage.

公开(公告)号：US09401615B2

公开(公告)日：2016-07-26

申请号：US14489204

申请日：2014-09-17

Applicant: Seiko Instruments Inc.

Inventor： Satoshi Abe ,  Atsushi Sakurai

IPC: H02J7/00

CPC classification number: H02J7/0063 ,  H02J7/0031 ,  H02J7/007 ,  H02J2007/0037 ,  H02J2007/004 ,  H03K2217/0054

Abstract: A charging and discharging control circuit includes a switching circuit that controls the gate of a bidirectional conduction type field effect transistor; a first transistor of which the drain is connected to the drain of the bidirectional conduction type field effect transistor, the gate is connected to the source of the bidirectional conduction type field effect transistor, and the source and the back gate are connected to a first terminal of the switching circuit; and a second transistor of which the drain is connected to the source of the bidirectional conduction type field effect transistor, the gate is connected to the drain of the bidirectional conduction type field effect transistor, and the source and the back gate are connected to the first terminal of the switching circuit. The back gate of the bidirectional conduction type field effect transistor is connected to the first terminal of the switching circuit.

Abstract translation: 充放电控制电路包括控制双向导通型场效应晶体管的栅极的开关电路; 第一晶体管，其漏极连接到双向导电型场效应晶体管的漏极，栅极连接到双向导电型场效应晶体管的源极，源极和后栅极连接到第一端子 的开关电路; 以及第二晶体管，其漏极连接到双向导电型场效应晶体管的源极，栅极连接到双向导电型场效应晶体管的漏极，源极和后栅极连接到第一 端子的开关电路。 双向导通型场效应晶体管的背栅极连接到开关电路的第一端。

公开(公告)号：US09647465B2

公开(公告)日：2017-05-09

申请号：US14711343

申请日：2015-05-13

Applicant: Seiko Instruments Inc.

Inventor： Takashi Ono ,  Toshiyuki Koike ,  Satoshi Abe ,  Fumihiko Maetani

IPC: H02J7/00 ,  G01R31/36 ,  G01R31/02

CPC classification number: H02J7/00 ,  G01R31/025 ,  G01R31/3606 ,  H02J7/0029 ,  H02J7/0063 ,  H02J7/0072 ,  H02J7/0077 ,  H02J2007/0039 ,  H02J2007/0067

Abstract: A short-circuit and overcurrent detecting circuit includes a reference voltage circuit including a constant current circuit, a first impedance element, a first transistor having a resistance value depending a voltage of a secondary battery, a second impedance element, and a second transistor having a resistance value depending the voltage of the secondary battery, which are connected in series. The reference voltage circuit outputs a first reference voltage from a node of the constant current circuit and the first impedance element, and outputs a second reference voltage from a node of the first transistor and the second impedance element. The short-circuit and overcurrent detecting circuit further includes: a first comparator circuit for comparing a voltage of an overcurrent detecting terminal with the first reference voltage; and a second comparator circuit for comparing the voltage of the overcurrent detecting terminal with the second reference voltage.

公开(公告)号：US09203119B2

公开(公告)日：2015-12-01

申请号：US14195252

申请日：2014-03-03

Applicant: Seiko Instruments Inc.

Inventor： Takashi Ono ,  Toshiyuki Koike ,  Satoshi Abe

IPC: H01M10/42 ,  H02J7/00

CPC classification number: H01M10/4257 ,  H02J7/0029 ,  H02J2007/0039

Abstract: Provided is a battery device with high safety, which has improved accuracy of overcurrent detection. In the battery device, an overcurrent detection terminal of a battery state monitoring circuit is connected to a node between a discharge control switch and a charge control switch via a resistor.

Abstract translation: 提供了一种具有高安全性的电池装置，具有提高的过电流检测精度。 在电池装置中，电池状态监视电路的过电流检测端子通过电阻连接到放电控制开关和充电控制开关之间的节点。