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公开(公告)号：US20200235685A1
公开(公告)日：2020-07-23
申请号：US16747885
申请日：2020-01-21
Inventor： Takaaki GYOTEN
Abstract: An actuator driving device includes: first and second half bridge circuits driven according to modulated drive signals having an inverted relationship, generates a drive voltage for an actuator by switching a DC voltage, and outputs the drive voltage to the actuator; a current detection resistor which generates a current detection signal corresponding to current flowing through a series circuit including first and second switching elements and a series circuit including third and fourth switching elements; a hold circuit which holds the current detection signal from the current detection resistor and generates an output signal; a comparator which compares the output signal with a target amplitude signal to generate a comparison result signal; a multiplier which multiplies the comparison result signal and the drive signal to generate a multiplication result signal; and a PWM modulator which performs PWM modulation according to the multiplication result signal to generate a modulated drive signal.
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公开(公告)号：US20170366118A1
公开(公告)日：2017-12-21
申请号：US15623670
申请日：2017-06-15
Inventor： Takaaki GYOTEN
CPC classification number: H02P6/157 , H02M1/08 , H02M7/537 , H02M7/53871 , H02P3/22 , H02P6/182 , H02P2203/09
Abstract: A drive control device for a motor includes an input terminal, an output terminal, an inverter circuit, a first switch unit, a capacitor, a diode, a rectifier circuit, a photo coupler, a second switch unit, and a voltage detector. The inverter circuit converts a direct current voltage into an alternating current voltage, and outputs the alternating current voltage to the output terminal. The first switch unit shorts the output terminal based on a control signal. The capacitor is connected to the input terminal, and is charged by a direct current voltage. The diode is connected between the input terminal and the capacitor. The diode limits a direction where a charge current for charging the capacitor flows. The rectifier circuit rectifies an induced voltage, which is generated in the motor, and outputs a rectified voltage. The photo coupler converts the rectified voltage into an optical signal, and thereafter, converts the optical signal into a converted signal. The second switch unit outputs the control signal based on the converted signal. The voltage detector detects whether the direct current voltage is input to the input terminal, and determines whether to negate the control signal.
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公开(公告)号：US20170040770A1
公开(公告)日：2017-02-09
申请号：US15227245
申请日：2016-08-03
Inventor： Takaaki GYOTEN , Shinji MIYOSHI
CPC classification number: H01S5/0428 , H01S5/0427 , H01S5/4018 , H01S5/4025 , H05B33/0815 , H05B37/02 , Y02B20/346
Abstract: A semiconductor light source driving apparatus of the present disclosure includes a switching power supply that supplies a DC voltage, a power source switching FET, a coil, an inverting FET driver, a semiconductor light source device, and a free-wheeling diode. The power source switching FET switches on/off an output of a positive terminal of the switching power supply in accordance with an input PWM signal. The coil has a first end connected to the output of the power source switching FET. The inverting FET driver is connected between a second end of the coil and a negative terminal of the switching power supply and switched on/off in accordance with an input signal. The semiconductor light source device is connected between the second end of the coil and the negative terminal of the switching power supply. The first end of the coil and the negative terminal of the switching power supply are connected to the free-wheeling diode.
Abstract translation: 本公开的半导体光源驱动装置包括提供DC电压的开关电源，电源开关FET，线圈，反相FET驱动器，半导体光源装置和续流二极管。 电源开关FET根据输入的PWM信号来接通/断开开关电源的正极端子的输出。 线圈具有连接到电源开关FET的输出的第一端。 反相FET驱动器连接在线圈的第二端和开关电源的负极之间，并根据输入信号接通/断开。 半导体光源装置连接在线圈的第二端和开关电源的负极之间。 线圈的第一端和开关电源的负极端子连接到续流二极管。
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公开(公告)号：US20150264291A1
公开(公告)日：2015-09-17
申请号：US14645032
申请日：2015-03-11
Inventor： Kazuma TANI , Ken MASHITANI , Takaaki GYOTEN
CPC classification number: H04N5/7475 , H04N5/74 , H04N9/3144 , H04N9/3188
Abstract: A projection video display apparatus includes: a converter that converts an input video signal having a first number of pixels and a first frame rate into a conversion video signal having a second number of pixels and a second frame rate, the second number of pixels being smaller than the first number of pixels, and the second frame rate being an n-th multiple (n is an integer of 2 or greater) of the first frame rate; an optical element that displaces an optical axis of the video light beam; an optical element driving unit that drives the optical element at a frequency F being a natural-number multiple of the first frame rate; and a rotating body that rotates at a rotation speed R. The rotation speed R is set so as to become a value within a predetermined range corresponding to the frequency F.
Abstract translation: 投影视频显示装置包括：转换器，其将具有第一数量的像素和第一帧速率的输入视频信号转换成具有第二数量的像素和第二帧速率的转换视频信号，第二数量的像素更小 并且第二帧速率是第一帧速率的第n个倍数（n是2或更大的整数）; 使视频光束的光轴位移的光学元件; 光学元件驱动单元，其以频率F为第一帧率的自然数倍的速率驱动光学元件; 以及以旋转速度R旋转的旋转体。旋转速度R被设定为成为与频率F对应的规定范围内的值。
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