公开(公告)号：US10044226B2

公开(公告)日：2018-08-07

申请号：US14292044

申请日：2014-05-30

Applicant: ROHM CO., LTD.

Inventor： Masatoshi Watanabe ,  Takeshi Nozawa ,  Tatsuya Iwasaki ,  Manabu Miyata

IPC: H02J50/12 ,  H02J5/00 ,  H04B5/00 ,  H02J50/80 ,  H02J7/02

CPC classification number: H02J50/12 ,  H02J5/005 ,  H02J7/025 ,  H04B5/0031 ,  H04B5/0037 ,  H04B5/0075

Abstract: A first oscillator is configured to be switchable between a disabled state and an oscillation state in which a first clock signal CLK1 having a first frequency is generated. A second oscillator oscillates at a second frequency that is lower than the first frequency, so as to generate a second clock signal. In (i) a power transfer phase in which electric power is transmitted to a wireless power receiving apparatus, a controller instructs the first oscillator to oscillate, and generates a first pulse signal for controlling a driver according to the first clock signal. In (ii) a selection phase in which the presence or absence of the wireless power receiving apparatus is detected, the controller generates a second pulse signal for controlling the driver at a predetermined time interval, which is measured based on the second clock signal, and during which the first oscillator is set to the disabled state.

公开(公告)号：US09723674B2

公开(公告)日：2017-08-01

申请号：US15210297

申请日：2016-07-14

Applicant: ROHM CO., LTD.

Inventor： Takeshi Nozawa ,  Shingo Haruta

IPC: H05B33/08 ,  G02F1/1335

CPC classification number: H05B33/0842 ,  G02F1/133603 ,  G02F2001/133612 ,  H05B33/0815 ,  H05B33/0827

Abstract: A current driver connected with light emitting diode (LED) bars of the maximum number N of channels and driving LED bars of M channels to be driven, includes: PWM input terminal configured to receive PWM-modulated external dimming pulse having duty cycle with a target light quantity common to the LED bars of the M channels; pulse measurement circuit configured to measure period and pulse width of the external dimming pulse and generate digital period data and pulse width data; interface circuit connected to external processor and configured to receive enable data and phase difference setting data; M current sources of the M channels to be driven and respectively connected with corresponding LED bars, and configured to be On-and-Off-switched in response to internal dimming pulse; and pulse generator configured to generate M internal dimming pulses and distribute the M internal dimming pulses to the M current sources.

公开(公告)号：US20160190818A1

公开(公告)日：2016-06-30

申请号：US14980666

申请日：2015-12-28

Applicant: ROHM CO., LTD.

Inventor： Xun He ,  Daisuke Uchimoto ,  Takeshi Nozawa

IPC: H02J5/00

CPC classification number: H02J50/10

Abstract: A control circuit of a wireless power receiver where the wireless power receiver includes a reception coil, a rectification circuit that rectifies a current of the reception coil, and a smoothing capacitor connected to an output of the rectification circuit. The control circuit includes a frequency detecting part configured to determine a frequency of a signal received by the reception coil in a detection period after a lapse of predetermined first time from a predetermined start timing before a lapse of predetermined second time; a modulation detecting part configured to determine whether the signal received by the reception coil is subjected to FSK (Frequency Shift Keying); and a standard determining part configured to determine a standard that a wireless power transmitter complies with, depending on the frequency detected by the frequency detecting part and the presence or absence of FSK.

Abstract translation: 一种无线电力接收机的控制电路，其中无线电力接收机包括接收线圈，对整流电路进行整流的整流电路以及与整流电路的输出相连接的平滑电容器。 控制电路包括：频率检测部，被配置为在经过预定的第二时间之后从预定的开始定时经过预定的第一时间之后的检测周期中确定接收线圈接收到的信号的频率; 调制检测部，被配置为确定接收线圈接收到的信号是否受到FSK（频移键控）的影响; 以及标准确定部件，其被配置为根据由频率检测部分检测的频率和FSK的存在或不存在来确定无线电力发射机遵守的标准。

公开(公告)号：US10075029B2

公开(公告)日：2018-09-11

申请号：US15062783

申请日：2016-03-07

Applicant: ROHM CO., LTD.

Inventor： Hideharu Hayashida ,  Tatsuya Iwasaki ,  Takeshi Nozawa ,  Kazuyoshi Yasuoka

IPC: H02J50/90 ,  H02J50/10 ,  H02J50/80 ,  H02J50/12 ,  H02J7/02

CPC classification number: H02J50/90 ,  H02J7/025 ,  H02J50/12 ,  H02J50/80

Abstract: The position misalignment detection device includes: a comparator configured to compare an electric current induced by a receiving coil in a receiver (RX) to which an electric power is transmitted from a transmitter (TX) with a non-contact power supply transmitter method; a frequency counter connected to the comparator, the frequency counter configured to count transmit frequency fi transmitted from the transmitter; and a register configured to store a counted value Fi counted by the frequency counter. There is provided the position misalignment detection device which can detect a position misalignment of the receiver on the transmitter during electric charging.

公开(公告)号：US10069338B2

公开(公告)日：2018-09-04

申请号：US15009063

申请日：2016-01-28

Applicant: ROHM CO., LTD.

Inventor： Xun He ,  Daisuke Uchimoto ,  Takeshi Nozawa

IPC: H02J50/10 ,  H02J50/80

Abstract: A control circuit is provided for a power receiver apparatus. A target voltage range setting unit sets an upper limit voltage VH and a lower limit voltage VL that define a target voltage range REF to be set for a rectified voltage VRECT that develops across a smoothing capacitor. An electric power control unit compares the rectified voltage VRECT with each of the upper limit voltage VH and the lower limit voltage VL, and generates a power control signal DPC based on the comparison result. A modulator modulates the power control signal DPC, and transmits the modulated signal to a wireless power transmitter apparatus via a reception coil. Upon detection of an oscillation state in the rectified voltage VRECT, the target voltage range setting unit expands the target voltage range REF.

公开(公告)号：US09893565B2

公开(公告)日：2018-02-13

申请号：US14980666

申请日：2015-12-28

Applicant: ROHM CO., LTD.

Inventor： Xun He ,  Daisuke Uchimoto ,  Takeshi Nozawa

IPC: H01F27/42 ,  H02J50/10

CPC classification number: H02J50/10

Abstract: A control circuit of a wireless power receiver where the wireless power receiver includes a reception coil, a rectification circuit that rectifies a current of the reception coil, and a smoothing capacitor connected to an output of the rectification circuit. The control circuit includes a frequency detecting part configured to determine a frequency of a signal received by the reception coil in a detection period after a lapse of predetermined first time from a predetermined start timing before a lapse of predetermined second time; a modulation detecting part configured to determine whether the signal received by the reception coil is subjected to FSK (Frequency Shift Keying); and a standard determining part configured to determine a standard that a wireless power transmitter complies with, depending on the frequency detected by the frequency detecting part and the presence or absence of FSK.

公开(公告)号：US09750113B2

公开(公告)日：2017-08-29

申请号：US15139663

申请日：2016-04-27

Applicant: ROHM CO., LTD.

Inventor： Takeshi Nozawa ,  Shingo Haruta

IPC: H05B37/00 ,  H05B37/02 ,  H05B33/08 ,  G09G3/34

CPC classification number: H05B37/0254 ,  G09G3/3406 ,  H05B33/086

Abstract: A control circuit of a driving circuit for supplying a driving current to a light source includes: a pulse width modulation (PWM) input terminal configured to receive an input dimming pulse having an input duty ratio corresponding to a target light quantity of the light source, the input dimming pulse being pulse-width modulated; and a dimming controller configured to convert a period and a pulse width of the input dimming pulse into digital values, reconvert the digital values into an output dimming pulse having an output duty ratio which is the same as or different from the input duty ratio, and control the driving current to be on and off based on the output dimming pulse.