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    • 2. 发明授权
    • Control circuit and method for capacitor charging circuit
    • 电容充电电路的控制电路及方法
    • US08237415B2
    • 2012-08-07
    • US12255742
    • 2008-10-22
    • Tatsuya IwasakiIsao Yamamoto
    • Tatsuya IwasakiIsao Yamamoto
    • H02J7/00H02M7/5383H05B41/16
    • H02M3/33523G01R19/0084
    • An output voltage monitoring circuit monitors an output voltage of a capacitor charging circuit. A first sample-and-hold circuit samples and holds a voltage of a connection point of a primary coil of a transformer and a switching transistor. A first monitoring comparator compares output of the first sample-and-hold circuit with a predetermined first reference voltage. When the output of the first sample-and-hold circuit exceeds the first reference voltage, a signal processor executes predetermined signal processing. The first sample-and-hold circuit starts a sampling period after a predetermined first time has elapsed after the switching transistor is turned OFF. When a voltage drop across a detection resistor reaches a third reference voltage, the first sample-and-hold circuit ends the sampling period.
    • 输出电压监视电路监视电容器充电电路的输出电压。 第一采样保持电路对变压器的初级线圈和开关晶体管的连接点的电压进行采样并保持。 第一监视比较器将第一采样保持电路的输出与预定的第一参考电压进行比较。 当第一采样保持电路的输出超过第一参考电压时,信号处理器执行预定的信号处理。 第一采样保持电路在开关晶体管截止之后经过预定的第一时间之后开始采样周期。 当检测电阻上的电压降达到第三参考电压时,第一个采样和保持电路结束采样周期。
    • 3. 发明授权
    • Charge control circuit
    • 充电控制电路
    • US07898217B2
    • 2011-03-01
    • US11801323
    • 2007-05-09
    • Satoru NateIsao Yamamoto
    • Satoru NateIsao Yamamoto
    • H02J7/00
    • H02J7/0052H02J7/0068
    • In a charge control circuit that adjusts a charging current flowing through a battery to be charged from a power supply, a sense resistor is provided on a charging path to the battery from an external power supply. A charging current adjustment circuit adjusts the charging current based on an error voltage between a voltage drop across the sense resistor and a predetermined reference voltage. The charging control circuit is integrated in a package. The charging current is inputted to a current input terminal. A battery terminal outputs the charging current to the battery. The current input terminal and the battery terminal also function as terminals used to measure a resistance value of the sense resistor. A voltage monitoring terminal is provided to measure the reference voltage in an inspection process.
    • 在从电源调整流过待充电电池的充电电流的充电控制电路中,从外部电源向充电路径提供感测电阻。 充电电流调节电路基于检测电阻器两端的电压降与预定参考电压之间的误差电压来调节充电电流。 充电控制电路集成在一个封装中。 充电电流被输入到电流输入端。 电池端子输出到电池的充电电流。 电流输入端子和电池端子也用作测量检测电阻的电阻值的端子。 提供电压监视端子以在检查过程中测量参考电压。
    • 5. 发明授权
    • Data transmission system and cable
    • 数据传输系统和电缆
    • US07724035B2
    • 2010-05-25
    • US12242062
    • 2008-09-30
    • Isao Yamamoto
    • Isao Yamamoto
    • H03K17/16
    • H04L25/45
    • A data transmission system capable of transmitting data at high speed without being bound by a counterpart's power supply voltage can be realized. The data transmission system comprises multiple electronic equipment having individual power supplies, a cable for connecting between the multiple electronic equipment so as to transmit signals therebetween, digital data transmitting circuits extending between the multiple electronic equipment and the cable and each having an open drain type output section at the transmitting end, and an input section provided with a pull-up type resistor at the receiving end, wherein the resistor and the output section are moved from the electronic equipment to the connector of the cable so that parasitic capacitance for restricting time constant of waveforms of signals when rising is changed from a capacitance to a small capacitance.
    • 可以实现能够高速传输数据而不受对方的电源电压限制的数据传输系统。 数据传输系统包括具有单独电源的多个电子设备,用于在多个电子设备之间连接以在其间传输信号的电缆,在多个电子设备和电缆之间延伸的每个具有开漏型输出的数字数据传输电路 在接收端具有上拉式电阻器的输入部分,其中电阻器和输出部分从电子设备移动到电缆的连接器,使得用于限制时间常数的寄生电容 的上升时的信号波形从电容变为小电容。
    • 6. 发明申请
    • Charge Pump Circuit Driver Circuit Having A Plurality Of Oscillators
    • 具有多个振荡器的电荷泵电路驱动器电路
    • US20080094128A1
    • 2008-04-24
    • US11792178
    • 2005-11-18
    • Tomoyuki ItoIsao Yamamoto
    • Tomoyuki ItoIsao Yamamoto
    • G05F1/10H02M3/155
    • H02M3/07H05B33/0815Y02B20/346
    • In a driver circuit for a charge pump circuit capable of switching a step-up ratio, first and second oscillators oscillating at different frequencies are provided. The charge pump circuit is controlled by a control unit. The first oscillator outputs a first periodic signal required for the control unit to control the step-up action of the charge pump circuit. The second oscillator outputs a second periodic signal employed for a time measurement and having a frequency set lower than that of the first periodic signal. The control unit monitors the state of the driver circuit itself or the charge pump circuit and switches the step-up ratio of the charge pump circuit if a predetermined state continues for equal to or more than a predetermined period of time. The control unit turns on only the first oscillator when the step-up ratio of the charge pump circuit is lager than 1 to thereby perform the control of the step-up action and the time measurement based on the first periodic signal. On the other hand, when the step-up ratio is 1, the control unit turns on only the second oscillator and performs the time measurement based on the second periodic signal.
    • 在能够切换升压比的电荷泵电路的驱动电路中,提供以不同频率振荡的第一和第二振荡器。 电荷泵电路由控制单元控制。 第一振荡器输出控制单元所需的第一周期信号以控制电荷泵电路的升压动作。 第二振荡器输出用于时间测量并具有低于第一周期信号的频率的第二周期信号。 如果预定状态持续等于或大于预定时间段,则控制单元监视驱动器电路本身或电荷泵电路的状态,并切换电荷泵电路的升压比。 当电荷泵电路的升压比大于1时,控制单元仅接通第一振荡器,由此执行基于第一周期信号的升压动作和时间测量的控制。 另一方面,当升压比为1时,控制单元仅接通第二振荡器,并且基于第二周期信号执行时间测量。
    • 7. 发明申请
    • Voltage Generating Circuit, Constant Current Circuit and Light Emitting Diode Driving Circuit
    • 电压发生电路,恒流电路和发光二极管驱动电路
    • US20080048737A1
    • 2008-02-28
    • US11791772
    • 2005-10-26
    • Tomoyuki ItoIsao Yamamoto
    • Tomoyuki ItoIsao Yamamoto
    • H02M3/155G05F1/00G05F1/577H03L5/00H03K3/015G06F3/038
    • H05B33/0851
    • A voltage generating circuit includes a voltage generating unit which generates plural constant voltages, plural switches, a control signal generating unit and a decoding circuit. The switches select any one of the plural constant voltages generated from the voltage generating unit and outputs it from a voltage output terminal. The control signal generating unit generates plural control signals which are switched between a high level and a low level through trimming on plural fuse resistors. The decoding circuit controls the state of connection of the switches-according to the control signals. The reference voltage Vx output from the voltage output terminal is applied to an electric-current generating resistor through an operational amplifier and a transistor to generate a constant electric current.
    • 电压产生电路包括产生多个恒定电压的电压产生单元,多个开关,控制信号产生单元和解码电路。 开关选择从电压产生单元产生的多个恒定电压中的任何一个,并从电压输出端子输出。 控制信号生成单元通过对多个熔丝电阻进行修整来生成在高电平和低电平之间切换的多个控制信号。 解码电路根据控制信号控制开关的连接状态。 从电压输出端子输出的参考电压Vx通过运算放大器和晶体管施加到电流产生电阻器,以产生恒定的电流。
    • 8. 发明授权
    • Power supply apparatus capable of supplying a stable converted voltage
    • 能够提供稳定转换电压的电源装置
    • US07253596B2
    • 2007-08-07
    • US10970757
    • 2004-10-21
    • Isao YamamotoYoichi Tamegai
    • Isao YamamotoYoichi Tamegai
    • G05F1/40
    • H02M3/1588H02M1/32H02M2001/0045Y02B70/1466
    • A power supply apparatus switchably operates an LDO regulator and a DC/DC converter connected in parallel so as to control a battery voltage Vbat from a power supply at a constant output voltage VO. A detected voltage Vs at a shared output terminal shared by the LDO regulator and the DC/DC converter is input to a feedback input terminal and fed back to the LDO regulator and the DC/DC converter. In order to suppress an undershoot occurring when switching from the LDO regulator to the DC/DC converter, a timing signal generating unit supplies a capability switching timing signal to a pre-drive circuit and switches the control capability of the DC/DC converter from a low capability mode at startup to a high capability mode.
    • 电源装置可切换地操作并联连接的LDO调节器和DC / DC转换器,以便以恒定的输出电压VO控制来自电源的电池电压Vbat。 在LDO调节器和DC / DC转换器共享的共享输出端子处的检测电压Vs被输入到反馈输入端子并反馈到LDO调节器和DC / DC转换器。 为了抑制从LDO调节器切换到DC / DC转换器时发生的下冲,定时信号生成单元将能力切换定时信号提供给预驱动电路,并将DC / DC转换器的控制能力从 启动时的低容量模式为高容量模式。