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公开(公告)号：US11252384B2
公开(公告)日：2022-02-15
申请号：US17022573
申请日：2020-09-16
Inventor： Takaaki Gyoten
Abstract: A semiconductor light source driving device includes: a switching power supply circuit that converts a voltage across direct current (DC) power supply into a DC output voltage and outputs the DC output voltage to a semiconductor light source; and a light source driving circuit connected in series to the semiconductor light source. The switching power supply circuit includes: a switching circuit; an output capacitor; a controller; and an inductor short circuit. The switching circuit includes: a first switching element for voltage control; a second switching element connected in series to the first switching element; and an inductor connected to a connection point between the first and second switching elements. The inductor short circuit includes a diode and a fourth switching element connected in series to the diode.
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公开(公告)号：US09763290B2
公开(公告)日：2017-09-12
申请号：US14656302
申请日：2015-03-12
Inventor： Takaaki Gyoten
CPC classification number: H05B33/0815 , G03B21/2033 , G03B21/2053
Abstract: The semiconductor light source drive device according to the present disclosure includes: a switching power source that is connected in series with a semiconductor light source element and a constant current circuit to output a predetermined voltage to the semiconductor light source element and the constant current circuit; a detection circuit that detects a voltage at a connecting point between the semiconductor light source element and the constant current circuit; and a controller that controls the voltage output from the switching power source based on the voltage detected by the detection circuit, and controls a current value of the constant current circuit based on a switching signal. The controller, prior to varying the current value of the constant current circuit, varies the voltage output from the switching power source in accordance with an amount to be varied in the current value of the constant current circuit.
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公开(公告)号：US10205529B2
公开(公告)日：2019-02-12
申请号：US15997019
申请日：2018-06-04
Inventor： Takaaki Gyoten , Akiyoshi Yamaguchi
IPC: H04B10/516 , H04B10/524 , H04B10/54
Abstract: A light source modulation circuit includes a pulse width modulator (PWM) PWM-modulating an input PWM carrier signal according to an input on-time ratio signal to output a PWM-modulated signal, a frequency divider circuit frequency-dividing the PWM carrier signal at a predetermined frequency division ratio to output a communication carrier signal, a communication modulator modulating the communication carrier signal according to an input communication modulation code to output a communication modulation signal, an operational circuit performing a logical AND operation of the PWM-modulated signal and the communication modulation signal to output a resulting signal of the operation as a light source modulation signal, and a light source drive circuit generating a light source drive signal based on the light source modulation signal.
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公开(公告)号：US10091477B2
公开(公告)日：2018-10-02
申请号：US15183328
申请日：2016-06-15
Inventor： Akiyoshi Yamaguchi , Masutaka Inoue , Takaaki Gyoten , Takaaki Abe , Ryoji Okubo , Kazuma Tani
Abstract: The projection image display apparatus includes a display element that emits image light generated by modulating light from a light source based, a pixel-shifter that shifts a pixel of a projected image by changing an optical path of the image light, a resampling circuit, a motion-interpolation image processing circuit, and a pixel-shift controller. The resampling circuit generates a plurality of sub-frame image signals having a resolution of the display element, by resampling an image signal having a resolution of the projected image. The motion-interpolation image processing circuit provides a motion-interpolation image process to the sub-frame image signals. The pixel-shift controller receives the sub-frame image signals having undergone the motion-interpolation image process. The pixel-shift controller drives the display element and the pixel shifter at a given timing based on the sub-frame image having undergone the motion-interpolation image process, and then displays the projected image, which involves pixel-shift, on a screen.
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公开(公告)号：US09705281B2
公开(公告)日：2017-07-11
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.
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Patent Agency Ranking
公开(公告)号：US11972706B2
公开(公告)日：2024-04-30
申请号：US17960275
申请日：2022-10-05
Inventor： Takaaki Gyoten
CPC classification number: G09G3/002 , H04N9/3194 , G09G2360/141 , G09G2360/145 , G09G2370/18
Abstract: An image display system includes semiconductor light sources that output optical signals including modulated signal portions at timings different from each other, optical fiber cables that respectively transmit the optical signals, a light synthesizer that synthesizes the optical signals to output a synthesized optical signal, a light amount detector that detects an output light amount of the synthesized optical signal, a modulated signal detector that detects the modulated signal portions from the detected output light amount, an image modulator that modulates the synthesized optical signal according to an input image signal to output a modulated image light, and a light source controller that outputs drive control signals for respectively outputting the optical signals respectively including the modulated signal portions according to the image signal, and detects a failure of the optical fiber cables based on whether a modulated signal portion among the plurality of modulated signal portions is detected.
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公开(公告)号：US10033310B2
公开(公告)日：2018-07-24
申请号：US15623670
申请日：2017-06-15
Inventor： Takaaki Gyoten
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：US09661704B2
公开(公告)日：2017-05-23
申请号：US15154949
申请日：2016-05-14
Inventor： Takaaki Gyoten , Shinji Miyoshi
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0845
Abstract: A semiconductor light source drive device includes a semiconductor light source; a switching element that controls a current flowing through the semiconductor light source by being on/off-controlled by a PWM signal provided to the control end; a current detection element that detects a current flowing through the semiconductor light source; a switching power source that supplies power supply voltage to a series connection of the semiconductor light source, the switching element, and the current detection element; a PWM supply circuit supplies the PWM signal and its on-time ratio information; a target value setting part converts the on-time ratio information to a target average current value and outputs the target average current value; and a comparator compares the target average current value with an average current value detected by the current detection element and outputs comparison output to the switching power source as a signal for control.
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公开(公告)号：US20240364850A1
公开(公告)日：2024-10-31
申请号：US18646291
申请日：2024-04-25
Inventor： Shota Yamamoto , Kazuhiko Nono , Daizou Seko , Takaaki Gyoten
CPC classification number: H04N9/3155 , G01R33/072 , H04N9/3161
Abstract: Provided is a projector configured to modulate light from a light source unit and project image light, the projector including: a current measurement unit that measures a current supplied from a power supply, the current including at least a current supplied to the light source unit of the projector; and a controller that compares a measured current value measured by the current measurement unit with limit value information determined by user input or based on data stored in advance, and controls power output to the light source unit in accordance with a comparison result.
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公开(公告)号：US10756730B2
公开(公告)日：2020-08-25
申请号：US16553502
申请日：2019-08-28
Inventor： Takaaki Gyoten
IPC: H03K17/687 , H03K7/08 , H05B45/10 , H05B45/37 , H05B45/345
Abstract: A semiconductor light-emitting device driving apparatus is disclosed with a semiconductor light-emitting device. In the semiconductor light-emitting device driving apparatus, a switching power supply outputs a driving current for driving the semiconductor light-emitting device, and a switching element controls the driving current to be turned on and off. A PWM modulator generates a PWM modulation signal for controlling the switching element to be turned on and off based on a PWM setting value inputted from outside, and a feedback circuit drives and controls the switching power supply based on the driving current and a target current value that is externally inputted. The feedback circuit drives and controls the switching power supply such that an average value of the driving current for an interval when the driving current flows is equal to the target current value.
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