公开(公告)号：US20220085640A1

公开(公告)日：2022-03-17

申请号：US17472921

申请日：2021-09-13

Applicant: MAKITA CORPORATION

Inventor： Hisakazu OKABAYASHI ,  Masaya MIZUTANI

IPC: H02J7/00 ,  G01R31/36

Abstract: A charger includes a first connection portion, a second connection portion, a power-supply circuit, an integration circuit, a storage device, a first calculation circuit, a threshold setting circuit, a detection circuit, and a reduction circuit. The power-supply circuit includes a heat-generating component. At a start of charging a battery, the first calculation circuit calculates a first detection threshold candidate based on a first correspondence data (or a first correlation data). The first detection threshold candidate corresponds to a first temperature threshold that is calculated, with a calculated integrated capacity assigned to a battery capacity, based on the first correspondence data. The threshold setting circuit sets the first detection threshold candidate as a detection threshold. The reduction circuit performs reduction of a charging current value in response to a detected temperature of the heat-generating component having become higher than or equal to the detection threshold.

公开(公告)号：US20230208179A1

公开(公告)日：2023-06-29

申请号：US18086080

申请日：2022-12-21

Applicant: MAKITA CORPORATION

Inventor： Masaya MIZUTANI ,  Hisakazu OKABAYASHI

IPC: H02J7/00 ,  G01R31/388

CPC classification number: H02J7/00718 ,  G01R31/388 ,  H02J7/0031 ,  H02J7/00036

Abstract: A battery charger in one aspect of the present disclosure includes a terminal, a power-supply circuit, a charge current path, a measurement circuit, and a control circuit. The measurement circuit includes a voltage generator and an amplifier circuit. The voltage generator (i) is provided on the charge current path and (ii) generates one or more voltages with the charge current. The amplifier circuit amplifies the one or more voltages to thereby output at least a first amplified voltage and a second amplified voltage. The control circuit cyclically obtains at least the first and second amplified voltages. The control circuit detects that the measurement circuit is in a fault condition based on at least the first and second amplified voltages obtained.

公开(公告)号：US20130191428A1

公开(公告)日：2013-07-25

申请号：US13738051

申请日：2013-01-10

Applicant: MAKITA CORPORATION

Inventor： Hisakazu OKABAYASHI

IPC: G06F7/58

CPC classification number: G06F7/582 ,  G06F7/588

Abstract: A random number generating device includes: a microcomputer; a first oscillator circuit that has a predetermined temperature characteristic and generates a clock serving as a basis of a behavior of the microcomputer; and an electronic circuit that has a temperature characteristic being different from the predetermined temperature characteristic of the first oscillator circuit and operates in accordance with a command from the microcomputer. The microcomputer measures an operating time of the electronic circuit based upon the clock generated by the first oscillator circuit and generates a random number based upon a result of the measurement.

Abstract translation: 随机数生成装置包括：微型计算机; 第一振荡器电路，具有预定的温度特性并产生用作微计算机的行为的基础的时钟; 以及具有与第一振荡电路的预定温度特性不同的温度特性的电子电路，并根据来自微型计算机的命令进行操作。 微型计算机基于由第一振荡电路产生的时钟来测量电子电路的工作时间，并根据测量结果生成随机数。

公开(公告)号：US20210075233A1

公开(公告)日：2021-03-11

申请号：US17010103

申请日：2020-09-02

Applicant: MAKITA CORPORATION

Inventor： Hisakazu OKABAYASHI ,  Masaya MIZUTANI ,  Makoto ITO

IPC: H02J7/00 ,  H02J7/04

Abstract: A charger according to one aspect of the present disclosure includes a current outputter, a first charge controller, and a second charge controller. The first charge controller receives a first required information from a first device in accordance with a first communication protocol. The first communication protocol requires at least a first minimum volume of communication to acquire the first required information from the first device. The second charge controller receives a second required information from a second device in accordance with a second communication protocol. The second communication protocol requires at least a second minimum volume of communication to acquire a second required information from the second device. The second minimum volume is smaller than the first minimum volume.

公开(公告)号：US20180278071A1

公开(公告)日：2018-09-27

申请号：US15920888

申请日：2018-03-14

Applicant: MAKITA CORPORATION

Inventor： Junichi MURAKAMI ,  Masaya MIZUTANI ,  Hisakazu OKABAYASHI

IPC: H02J7/00 ,  H01M10/44

CPC classification number: H02J7/0045 ,  H01M10/441 ,  H01M10/443 ,  H02J7/0003 ,  H02J7/0013 ,  H02J7/0026

Abstract: A charger (5) includes connecting parts (31, 32), a main converter (83), charging paths (Cpa, Cpb), switching elements (SWa, SWb), and a charging-control part (200). A first battery (Ba) having a first mounting part (11) and a second battery (Bb) having a second, different mounting part (21) are respectively mountable on the connecting parts (31, 32). The charging paths (Cpa, Cpb) respectively connect the main converter (83) to the connecting parts (31, 32). The switching elements (SWa, SWb) respectively connect or disconnect the charging paths (Cpa, Cpb) to/from the main converter (83). The charging-control part (200) selects one of the batteries (Ba, Bb) as the charging target and sets the charging path, to which the charging target (Ba, Bb) is connected, to the connected state. Then, the charger (5) charges the charging target to a predetermined voltage using a charging current suited to the charging target.