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1. 发明授权

US10635127B2 Reference voltage generator circuit generating reference voltage based on band gap by controlling currents flowing in first and second voltage generator circuits 有权
公开(公告)号：US10635127B2
公开(公告)日：2020-04-28
申请号：US16484539
申请日：2017-11-09
申请人： RICOH ELECTRONIC DEVICES CO., LTD.
发明人： Yohkoh Hirose
IPC分类号： G05F1/567 , G05F3/30 , G05F1/46
CPC分类号： G05F3/30 , G05F1/567 , G05F1/468
摘要： A reference voltage generator circuit is provided with a first voltage generator circuit that generates a first direct-current voltage; a second voltage generator circuit that generates a second direct-current voltage; and an operational amplifier that generates a voltage difference between the first and second direct-current voltages. The reference voltage generator circuit generates a reference voltage based on a band gap by controlling currents flowing in the first and second voltage generator circuits based on the voltage difference, and includes a third voltage generator circuit including a PNP bipolar transistor, which is connected in parallel with the first voltage generator circuit. The third voltage generator circuit generates a third direct-current voltage corresponding to a base current flowing in the PNP bipolar transistor, and applies it to the operational amplifier with the first direct-current voltage.

2. 发明授权

US10284075B2 Overvoltage protection circuit for protecting overvoltage corresponding to wide range of input voltage 有权
公开(公告)号：US10284075B2
公开(公告)日：2019-05-07
申请号：US16052136
申请日：2018-08-01
申请人： RICOH ELECTRONIC DEVICES CO., LTD. , NATIONAL UNIVERSITY CORPORATION OITA UNIVERSITY
发明人： Shohtaroh Sohma , Yuji Takeyama , Kimihiro Nishijima
IPC分类号： H02M1/32 , H02H7/125 , H02M3/335 , H02M7/06 , H02M7/155
摘要： An overvoltage protection circuit is provided which is connected between a rectifier circuit and a load including an input capacitor element connected to both ends of the load. The overvoltage protection circuit includes a semiconductor switch connected between the rectifier circuit and the load, and a control circuit controls the semiconductor switch. When the rectified voltage exceeds a predetermined value, the control circuit turns off the semiconductor switch, and detects a voltage potential difference between both ends of the semiconductor switch, and then, for an interval when the voltage potential difference is zero or a predetermined minute value, the control circuit generates a control voltage for turning on the semiconductor switch, and outputs the control voltage to a control terminal of the semiconductor switch. The overvoltage protection circuit includes a current change circuit that gradually changes a current flowing through the semiconductor switch.

3. 发明申请

US20180219473A1 POWER SUPPLY APPARATUS CONVERTING INPUT VOLTAGE TO PREDETERMINED OUTPUT VOLTAGE AND CONTROLLING OUTPUT VOLTAGE BASED ON FEEDBACK SIGNAL CORRESPONDING TO OUTPUT VOLTAGE 审中-公开
公开(公告)号：US20180219473A1
公开(公告)日：2018-08-02
申请号：US15420125
申请日：2017-01-31
申请人： Yuuta OGINO , Shohtaroh SOHMA
发明人： Yuuta OGINO , Shohtaroh SOHMA
IPC分类号： H02M1/42 , H02M3/04 , G05F1/575 , H02M7/06 , H05B33/08
CPC分类号： H05B33/0809 , G05F1/575 , H02M3/158 , H02M2003/1566
摘要： A power supply apparatus of the present invention has an input terminal and an output terminal, and converts an input voltage at the input terminal into a predetermined output voltage at the output terminal. The power supply apparatus includes first and second power supply circuits and a smoothing capacitor. The first power supply circuit is coupled between the input terminal and the output terminal, and converts the input voltage into a predetermined voltage to output the predetermined voltage. The smoothing capacitor is coupled to the output terminal. The second power supply circuit outputs a predetermined voltage or current to the output terminal via the smoothing capacitor, based on a feedback signal corresponding to the predetermined output voltage.

4. 发明授权

US09431907B2 Switching regulator incorporating operation monitor 有权
标题翻译：开关调节器并入运行监视器
公开(公告)号：US09431907B2
公开(公告)日：2016-08-30
申请号：US14461554
申请日：2014-08-18
申请人： Yuusuke Michishita
发明人： Yuusuke Michishita
IPC分类号： H02M3/158 , H02M1/00
CPC分类号： H02M3/1588 , H02M2001/0032 , Y02B70/1466 , Y02B70/16
摘要： A switching regulator includes a first switching element and a second switching element in a pair to be switched over to convert an input voltage to a certain constant voltage, and an operation monitor to monitor an operation state of the first switching element, in which a switching of the second switching element is changed according to a result of the monitoring by the operation monitor.
摘要翻译：一种开关调节器包括：第一开关元件和一对第二开关元件，用于切换以将输入电压转换成一定的恒定电压;以及操作监视器，用于监视第一开关元件的操作状态，其中开关根据操作监视器的监视结果来改变第二开关元件。

5. 发明授权

US09136847B2 Signal transmitting-receiving control circuit and secondary battery protection circuit 有权
标题翻译：信号发射接收控制电路和二次电池保护电路
公开(公告)号：US09136847B2
公开(公告)日：2015-09-15
申请号：US13635402
申请日：2011-03-14
申请人： Masashi Oshima
发明人： Masashi Oshima
IPC分类号： H02J7/00 , H03K17/687 , H03K19/0185
CPC分类号： H03K19/018521 , H02J7/0026
摘要： A signal transmitting-receiving circuit includes a first circuit including a first MOS transistor having a gate and a drain, a second MOS transistor having a gate and a drain connected to the gate and drain of the first MOS transistor, and a source connected to ground, and a transmitting terminal transmitting a signal connected to the drains of the first and second MOS transistors; and a second circuit including a receiving terminal receiving the signal transmitted from the transmitting terminal of the first circuit connected to the transmitting terminal, a third MOS transistor having a gate connected to the receiving terminal, a drain connected to a reference voltage generator circuit and a source connected to ground, a resistor connected between the third MOS transistor and the reference voltage generator circuit, and an output terminal connected between the resistor and the third MOS transistor.
摘要翻译：信号发送接收电路包括：第一电路，包括具有栅极和漏极的第一MOS晶体管;第二MOS晶体管，具有连接到第一MOS晶体管的栅极和漏极的栅极和漏极;以及连接到地的源极以及发送端子，发送连接到第一和第二MOS晶体管的漏极的信号; 以及第二电路，包括接收从连接到发送端子的第一电路的发送端子发送的信号的接收端子，具有连接到接收端子的栅极的第三MOS晶体管，连接到参考电压发生器电路的漏极和源极连接到地，连接在第三MOS晶体管和参考电压发生器电路之间的电阻器，以及连接在电阻器和第三MOS晶体管之间的输出端子。

6. 发明申请

US20220006985A1 LASER DRIVE APPARATUS FOR SEMICONDUCTOR LASER FOR VIDEO DISPLAY APPARATUS 有权
公开(公告)号：US20220006985A1
公开(公告)日：2022-01-06
申请号：US17281451
申请日：2018-12-21
申请人： RICOH ELECTRONIC DEVICES CO., LTD.
发明人： Masaki KIYOKAWA
IPC分类号： H04N9/31
摘要： A laser drive apparatus includes a DA converter including current sources of a number corresponding to a bit number of a digital input code, and switches of a number corresponding to the number of bits. The switches are connected to the current sources and selectively switch presence or absence of output of a control current therefrom, and the DA converter outputs control currents corresponding to the digital input code as output respective currents from the switches. The laser drive apparatus includes a driver circuit including current mirror circuits that generate a drive current corresponding to each output current based on each output current to drive a laser diode. In the driver circuit, the current sources are divided into current source sets, to which the current mirror circuits are connected via the switches, and generate a drive current corresponding to each output current to drive the laser diode.

7. 发明申请

US20210191442A1 CONSTANT VOLTAGE GENERATING CIRCUIT 有权
公开(公告)号：US20210191442A1
公开(公告)日：2021-06-24
申请号：US17253725
申请日：2018-06-27
申请人： RICOH ELECTRONIC DEVICES CO., LTD.
发明人： Takahiro HINO
IPC分类号： G05F1/575 , G05F1/46 , G05F1/445
摘要： A constant voltage generator circuit is provided with an operational amplifier including a feedback circuit having a first resistor, and an output transistor. The operational amplifier generates a feedback voltage generated by dividing an output voltage between an output terminal and a substrate voltage potential of the constant voltage generator circuit by the first resistor and a second resistor. Then, the operational amplifier is configured to amplify a voltage potential difference between a predetermined reference voltage and the feedback voltage and to output a control voltage. The output transistor controls an output voltage based on the control voltage from the operational amplifier, and the feedback circuit is further configured to superimpose high-frequency noise components from the substrate voltage potential onto the feedback voltage.

8. 发明授权

US09812959B2 Step up/down switching regulator 有权
公开(公告)号：US09812959B2
公开(公告)日：2017-11-07
申请号：US14463895
申请日：2014-08-20
申请人： Yohichi Shiwaya , Shinya Shimizu
发明人： Yohichi Shiwaya , Shinya Shimizu
IPC分类号： H02M3/158 , H02M1/00
CPC分类号： H02M3/158 , H02M3/1582 , H02M2001/0032 , H02M2001/0041 , Y02B70/16
摘要： A step up/down switching regulator converts an input voltage of an input terminal into a predetermined setting voltage in a step up/down manner and outputs the setting voltage as an output voltage from an output terminal. The step up/down switching regulator includes a bypass mode in which the input voltage is directly bypassed to the output terminal without performing a step up/down switching, and a step up/down switching mode in which the step up/down switching is performed. The step up/down switching regulator includes a step up/down output unit, a step up/down control unit, and a mode select terminal.

9. 发明授权

US09106081B2 Secondary cell protection circuit and battery 有权
标题翻译：二次电池保护电路和电池
公开(公告)号：US09106081B2
公开(公告)日：2015-08-11
申请号：US13578781
申请日：2011-02-15
申请人： Kuniaki Arai
发明人： Kuniaki Arai
IPC分类号： H02J7/00 , H01M10/42
CPC分类号： H02J7/0026 , H01M10/425 , H01M2200/00 , H02J7/0016
摘要： A secondary cell protection circuit configured to protect plural secondary cells connected in series is disclosed that includes plural switching parts configured to be connected in parallel with the secondary cells respectively; and a charge controller configured to turn on the switching part connected to the secondary cell of which cell voltage is greater than or equal to a return voltage, and to turn off the switching part when all cell voltages of the secondary cells become greater than or equal to the return voltage, when the secondary cells are being charged.
摘要翻译：公开了一种被配置为保护串联连接的多个二次电池的二次电池保护电路，其包括被配置为分别与二次电池并联连接的多个开关部件; 以及充电控制器，被配置为接通连接到其电池电压大于或等于返回电压的二次电池的开关部分，并且当所述二次电池的所有电池电压变得大于或等于时关闭所述开关部件当二次电池正在充电时，返回电压。

10. 发明授权

US09071125B2 Switching regulator, control method thereof and power-supply device 有权
标题翻译：开关稳压器及其控制方法及电源装置
公开(公告)号：US09071125B2
公开(公告)日：2015-06-30
申请号：US13761390
申请日：2013-02-07
申请人： Yuusuke Michishita
发明人： Yuusuke Michishita
IPC分类号： H02M3/156 , H02M3/157 , H02M7/04
CPC分类号： H02M7/04 , H02M3/156
摘要： A switching regulator configured to convert an input voltage input to an input terminal into a predetermined constant voltage by switching with at least two elements including a pair of switching elements or a switching element and a rectifying element, and output the converted voltage as an output voltage from an output terminal includes a comparison unit configured to compare a signal showing an oscillating frequency of the switching regulator with a signal showing a constant frequency, and a driver configured to delay a pulse signal generated by feeding-back a control signal and an output signal of the switching regulator according to the comparison result by the comparison unit with a predetermined time, and switch the input voltage by using the at least two elements based on the pulse signal after the delay.
摘要翻译：一种开关调节器，被配置为通过利用包括一对开关元件或开关元件和整流元件的至少两个元件切换将输入到输入端子的输入电压转换为预定的恒定电压，并将转换的电压输出为输出电压输出端子包括比较单元，其被配置为将表示开关调节器的振荡频率的信号与表示恒定频率的信号进行比较;以及驱动器，被配置为延迟通过反馈控制信号和输出信号而产生的脉冲信号根据比较单元的比较结果与预定时间相关的开关调节器，并且基于延迟之后的脉冲信号，通过使用至少两个元件来切换输入电压。

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