公开(公告)号：US20130147399A1

公开(公告)日：2013-06-13

申请号：US13706984

申请日：2012-12-06

Applicant: TDK Corporation

Inventor： Kazunori OSHIMA ,  Hironobu MASUOKA ,  Mitsuyuki TSUJISAKA ,  Yukiharu MIYAOKA

IPC: H05B37/02

CPC classification number: H05B37/02 ,  H05B33/0815 ,  H05B33/0887

Abstract: A light emitting element drive device includes an electric conduction switch that is provided along a power input line, a voltage detection unit that detects a power source voltage containing a noise component when the electric power is supplied to the power input line, a conversion processing unit that converts the detected power source voltage containing the noise component to a digital value, a data generation unit that generates data of a predetermined number of bits, and a control unit that turns on the electric conduction switch. The control unit determines a delay time based on the predetermined number of bits. The delay time corresponds to a time between supplying the electric power to the power input line and turning on the electric conduction switch. The control unit turns on the electric conduction switch after the delay time passes. Thus, an excessive rush current is prevented.

Abstract translation: 一种发光元件驱动装置，包括沿着电力输入线设置的导电开关，电压检测单元，当电力被提供给电力输入线时，检测包含噪声分量的电源电压;转换处理单元 将检测到的包含噪声分量的电源电压转换为数字值，产生预定位数的数据的数据生成单元以及导通导通开关的控制单元。 控制单元基于预定位数确定延迟时间。 延迟时间对应于向电力输入线供电和接通导通开关之间的时间。 延迟时间过后，控制单元接通导通开关。 因此，防止了过大的冲击电流。

公开(公告)号：US20130099834A1

公开(公告)日：2013-04-25

申请号：US13654513

申请日：2012-10-18

Applicant: TDK Corporation

Inventor： Kazunori OSHIMA ,  Hironobu MASUOKA ,  Mitsuyuki TSUJISAKA ,  Yukiharu MIYAOKA

IPC: H03K4/06

CPC classification number: H03K4/58 ,  H02M3/156

Abstract: A ramp signal generation circuit comprises a first input terminal that receives a clock signal, a plurality of second input terminals that receive high-level or low-level signals, and a discharge and charge circuit that discharges and charges the capacitor and that outputs a ramp signal corresponding to a voltage generated by the capacitor. The discharge and charge circuit comprises a discharge circuit that discharges the capacitor, and a charge circuit that is configured with a plurality of paired resistors and rectifying elements connected between the capacitor and the plurality of second input terminals. The discharge and charge circuit selects at least one of the plurality of second input terminals so as to change a current value for charging the capacitor by inputting the high-level signal to the selected one of the plurality of second input terminals.

Abstract translation: 斜坡信号产生电路包括接收时钟信号的第一输入端子，接收高电平或低电平信号的多个第二输入端子，以及放电和充电电路，其对电容器进行放电和充电，并输出斜坡 信号对应于由电容器产生的电压。 放电和充电电路包括放电电容器，以及充电电路，其配置有连接在电容器和多个第二输入端子之间的多个成对电阻器和整流元件。 放电和充电电路选择多个第二输入端子中的至少一个，以便通过将高电平信号输入到多个第二输入端子中的所选择的一个来改变用于对电容器充电的电流值。

公开(公告)号：US20240022243A1

公开(公告)日：2024-01-18

申请号：US17620556

申请日：2021-02-26

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA

IPC: H03K17/687 ,  H03K17/60 ,  B41J2/045

CPC classification number: H03K17/687 ,  H03K17/60 ,  B41J2/04541

Abstract: A bridge circuit (30) alternately applies a first voltage and a second voltage having mutually different polarities to a capacitor (200). A diode (41) is connected to one end of the capacitor (200). A diode (42) is connected to another end of the capacitor (200). A capacitor (50) is connected to the diode (41) and the diode (42). A control circuit (60) controls a plurality of switch elements included in the bridge circuit (30) in such a way that electric charge stored in the capacitor (200) moves to the capacitor (50) via the diode (41) when a voltage applied to the capacitor (200) transitions from the first voltage to the second voltage and electric charge stored in the capacitor (200) moves to the capacitor (50) via the diode (42) when a voltage applied to the capacitor (200)transitions from the second voltage to the first voltage.

公开(公告)号：US20200012007A1

公开(公告)日：2020-01-09

申请号：US16489184

申请日：2018-05-29

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Akira GOTANI ,  Kazuki KONDO

IPC: G01V3/10 ,  H02J5/00 ,  H02J50/80 ,  H02J50/60

Abstract: A metallic foreign object detector is used in a wireless power transmission system that transmits power by wireless from a feeding coil to a receiving coil and includes an antenna coil, a capacitor that forms a resonance circuit together with the antenna coil, a vibration detection circuit configured to detect generation of a vibration signal in the resonance circuit, and a determination circuit that detects the presence/absence of a metallic foreign object according to the vibration signal. The vibration detection circuit is configured to output a detection state signal indicating the detection state of generation of the vibration signal. The determination circuit is configured to execute an operation of detecting the presence/absence of a metallic foreign object according to the detection state signal.

公开(公告)号：US20190305613A1

公开(公告)日：2019-10-03

申请号：US16365236

申请日：2019-03-26

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Ryo MIYAZAWA ,  Shinya OFUJI

IPC: H02J50/90 ,  H02J50/12

Abstract: A wireless power reception device that can detect a position of a power receiving coil relative to a power transmitting coil irrespective of a connection state of a load is provided. A wireless power reception device includes: a power receiving coil that is magnetically coupled to the power transmitting coil; a first rectifier circuit that rectifies an AC voltage supplied from the power receiving coil and outputs the rectified voltage to a load; a first capacitor connected between an 11th output terminal on the high potential side among output terminals included in the first rectifier circuit and a 12th output terminal on the low potential side among the output terminals included in the first rectifier circuit between the first rectifier circuit and the load; a second rectifier circuit that is connected to the power receiving coil in parallel to the first rectifier circuit and rectifies the AC voltage supplied from the power receiving coil; a second capacitor connected between a 21st output terminal on the high potential side among output terminals included in the second rectifier circuit and a 22nd output terminal on the low potential side among the output terminals included in the second rectifier circuit; a second voltage detecting circuit that detects a voltage between the 21st output terminal and the 22nd output terminal; and a position detecting circuit that detects a position of the power receiving coil relative to the power transmitting coil on the basis of the voltage detected by the second voltage detecting circuit.

公开(公告)号：US20190305612A1

公开(公告)日：2019-10-03

申请号：US16359967

申请日：2019-03-20

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Ryo MIYAZAWA ,  Kenji FURUKAWA ,  Shinya OFUJI

IPC: H02J50/90 ,  H02J50/12

Abstract: A wireless power reception device detects a power receiving coil position relative to a power transmitting coil while curbing an increase in power loss. The wireless power reception device includes: a power receiving coil magnetically coupled to the power transmitting coil; a first rectification and smoothing circuit rectifying an AC voltage supplied from the power receiving coil and outputs the rectified AC voltage to a load; first and second capacitors respectively connected to first and second transmission lines; a first resistor having one terminal connected to the first capacitor and the other terminal is supplied with a predetermined reference potential; a second resistor having one terminal connected to the second capacitor and the other terminal is supplied with the reference potential; and a position detecting circuit detecting the power receiving coil position relative to the power transmitting coil on the basis of first and second junction point potentials.

公开(公告)号：US20170279310A1

公开(公告)日：2017-09-28

申请号：US15461938

申请日：2017-03-17

Applicant: TDK CORPORATION

Inventor： Akihiro II ,  Kazunori OSHIMA ,  Yasuhiro OZAWA ,  Ken MATSUURA

IPC: H02J50/12

CPC classification number: H02J50/12 ,  H02J50/80

Abstract: A wireless power transmission system includes a power feeding device and a power receiving device, wherein the power feeding device includes: a power feeding coil which receives an electric power to generate an AC magnetic field; an inverter for supplying an alternating-current power under a predetermined driving frequency to the power feeding coil; a current detection circuit for detecting a peak value of an alternating current flowing in the power feeding coil; and a controller for controlling the alternating current flowing in the power feeding coil. The power receiving device includes: a power receiving coil for receiving electric power wirelessly via the AC magnetic field; a power receiving side resonance capacitor which configures a power receiving side LC resonance circuit together with the power receiving coil; and a rectifier for rectifying the electric power received by the power receiving coil.

公开(公告)号：US20130187570A1

公开(公告)日：2013-07-25

申请号：US13744767

申请日：2013-01-18

Applicant: TDK Corporation

Inventor： Kazunori OSHIMA ,  Hironobu MASUOKA ,  Yukiharu MIYAOKA ,  Mitsuyuki TSUJISAKA

IPC: H05B33/08

CPC classification number: H05B33/0848

Abstract: A light emitting element drive device with PWM dimming includes an LED module, a power conversion circuit that supplies electric power to the LED module, a dimming switch element that performs an open/close operation for a path in which a current flows in the LED module, and a voltage detection circuit that detects a voltage value of a voltage that is output from the power conversion circuit. When the dimming switch element is turned ON, a control circuit performs feedback control so as to make a current value of the current close to a first target value. When the dimming switch element is turned OFF, the control circuit performs feedback control so as to make the voltage value close to a second target value. Wherein, the first target value is a predetermined value and the second target value is set based on the voltage value.

Abstract translation: 具有PWM调光的发光元件驱动装置包括LED模块，向LED模块提供电力的电力转换电路，对LED电流在LED模块中流动的路径执行打开/关闭操作的调光开关元件 以及检测从电力变换电路输出的电压的电压值的电压检测电路。 当调光开关元件接通时，控制电路执行反馈控制，以使电流的当前值接近第一目标值。 当调光开关元件关闭时，控制电路执行反馈控制，使得电压值接近第二目标值。 其中，第一目标值是预定值，并且基于电压值设置第二目标值。

公开(公告)号：US20130076259A1

公开(公告)日：2013-03-28

申请号：US13623498

申请日：2012-09-20

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Hironobu MASUOKA ,  Mitsuyuki TSUJISAKA

IPC: H05B39/04 ,  G05F1/00

CPC classification number: H05B33/0815 ,  H02M3/157 ,  H05B33/0818 ,  Y02B20/346

Abstract: A power supply device includes a convertor and an arithmetic circuit. The convertor supplies electric power by performing an ON and OFF operation of a switching element. The arithmetic circuit calculates a control command value at predetermined intervals based on a digital value, which reflects an output voltage of the convertor, from a conversion circuit. Based on the control command value, a pulse signal generation circuit determines a duty ratio of a pulse signal to make the output voltage of the convertor stable. A driving signal with a finely adjusted duty ratio can be generated by an operation clock signal having a lower frequency than a conventional device. As a result, the number of output lines is appropriate if there is at least a single output line for the pulse signal from the pulse signal generation circuit.

Abstract translation: 电源装置包括转换器和运算电路。 转换器通过执行开关元件的ON和OFF操作来提供电力。 算术电路基于从转换电路反映转换器的输出电压的数字值，以预定间隔计算控制指令值。 基于控制指令值，脉冲信号生成电路确定脉冲信号的占空比，使变换器的输出电压稳定。 具有微调占空比的驱动信号可以通过具有比常规装置低的频率的操作时钟信号来产生。 结果，如果来自脉冲信号发生电路的脉冲信号至少存在一条输出线，则输出线的数量是合适的。

公开(公告)号：US20130076258A1

公开(公告)日：2013-03-28

申请号：US13623401

申请日：2012-09-20

Applicant: TDK CORPORATION

Inventor： Kazunori OSHIMA ,  Hironobu MASUOKA ,  Mitsuyuki TSUJISAKA

IPC: G05F1/10 ,  H05B37/02

CPC classification number: H05B33/0815 ,  H02M3/157 ,  H05B33/0818

Abstract: A power supply device includes a converter and an arithmetic circuit. The arithmetic circuit calculates a present control command value at predetermined intervals based on a digital value, which reflects an output voltage of a converter, from a conversion circuit. The arithmetic circuit calculates the difference value between the present control command value and a previous control command value. Based on the difference value, it is determined whether a signal output circuit outputs a high-level signal toward a charge terminal or a low-level signal toward a discharge terminal. As a result, the number of output lines corresponds to at least the number of charge terminals and discharge terminals. The above features can be achieved with a simple circuit configuration by adding a discharge and charge circuit and without increasing the number of output lines.

Abstract translation: 电源装置包括转换器和运算电路。 算术电路基于从转换电路反映转换器的输出电压的数字值以预定间隔计算当前控制指令值。 算术电路计算当前控制命令值和先前控制命令值之间的差值。 基于差值，确定信号输出电路是否向充电端子输出高电平信号或向放电端子输出低电平信号。 结果，输出线的数量至少对应于充电端子和放电端子的数量。 通过添加放电和充电电路并且不增加输出线的数量，可以通过简单的电路配置来实现上述特征。