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    • 4. 发明授权
    • Switching power supply device, semiconductor device, and control method
    • 开关电源装置,半导体装置和控制方法
    • US07782638B2
    • 2010-08-24
    • US11525716
    • 2006-09-22
    • Kazuhiro MurataTetsuji YamashitaYoshihiro Mori
    • Kazuhiro MurataTetsuji YamashitaYoshihiro Mori
    • H02H7/12
    • H02M3/33507H02M1/32
    • A plurality of arrangements for detecting an overload of energy supplied to an output part enables selecting latch-off or auto-recovery overload protection by the operation of a switching device. When the drain current peak of the switching device exceeds a predetermined level denoting an overload, the FB pin voltage also rises to latch off, and when the drain current peak then reaches a maximum level, the CC pin voltage drops to a predetermined level and limits the oscillation period of the switching device because output power cannot be increased even if the load increases further. Latch-off overload protection can be applied when the drain current peak exceeding a predetermined level is detected, and auto-recovery overload protection can be applied when the CC pin voltage is detected to drop to a predetermined level.
    • 用于检测提供给输出部件的能量过载的多个布置使得能够通过开关装置的操作来选择闭锁或自动恢复过载保护。 当开关器件的漏极电流峰值超过表示过载的预定电平时,FB引脚电压也上升到锁存状态,当漏极电流峰值达到最大值时,CC引脚电压下降到预定值 即使负载进一步增加,开关器件的振荡周期也不能增加。 当检测到超过预定电平的漏极电流峰值时,可以应用锁存过载保护,并且当检测到CC引脚电压下降到预定电平时,可以应用自动恢复过载保护。
    • 7. 发明授权
    • Semiconductor device for controlling switching power supply
    • 用于控制开关电源的半导体器件
    • US07075802B2
    • 2006-07-11
    • US11089332
    • 2005-03-25
    • Tetsuji Yamashita
    • Tetsuji Yamashita
    • H02M3/335H02M7/44
    • H02M3/33523H02M2001/0032Y02B70/16
    • A semiconductor device (51) for controlling a switching power supply, includes a switching element (1) and a switching control circuit. During an intermittent switching operation of the switching element (1), when a return signal is outputted from a light load detection circuit (32) before the counting of a counter circuit (14), the switching operation of the switching element (1) is restarted at the timing of a transformer reset signal from a transformer reset detection circuit (13) after the return signal is outputted. When the return signal is outputted from the light load detection circuit (32) after the counting of the counter circuit (14), the switching operation of the switching element (1) is restarted, regardless of the transformer reset signal, only when the return signal is outputted.
    • 用于控制开关电源的半导体器件(51)包括开关元件(1)和开关控制电路。 在开关元件(1)的间歇切换动作期间,当在计数器电路(14)的计数之前从轻负载检测电路(32)输出返回信号时,开关元件(1)的开关动作为 在输出返回信号之后,从变压器复位检测电路(13)的变压器复位信号的定时重新开始。 当在计数器电路(14)的计数之后从轻负载检测电路(32)输出返回信号时,不管变压器复位信号如何,开关元件(1)的开关操作仅在返回 信号被输出。
    • 8. 发明授权
    • High-voltage generator
    • 高压发电机
    • US5394048A
    • 1995-02-28
    • US95911
    • 1993-07-23
    • Tetsuji YamashitaHitoshi Kawabata
    • Tetsuji YamashitaHitoshi Kawabata
    • H01L41/04H01L41/107H02M3/24H02M7/48H01L41/08
    • H01L41/107H01L41/044
    • A high-voltage generator employing a piezoelectric transformer has an inverter having input and output terminals connected to input terminals of the piezoelectric transformer, respectively; a feedback resistor connected to the input terminals of the piezoelectric transformer in parallel with the inverter; and first and second capacitors. The first capacitor is connected between the input terminal of the inverter and a ground. The second capacitor is connected between the output terminal of the inverter and the ground. The inverter, feedback resistor, and capacitors form a self-exciting oscillator to drive the piezoelectric transformer so that the piezoelectric transformer produces a high-voltage output. Since the inverter, feedback resistor, and capacitors are small, thin and light, the high-voltage generator as a whole is also small, thin and light.
    • 使用压电变压器的高压发生器具有分别连接到压电变压器的输入端的输入和输出端的逆变器; 反馈电阻器与变压器并联连接到压电变压器的输入端子; 以及第一和第二电容器。 第一个电容器连接在变频器的输入端和地之间。 第二个电容连接在变频器的输出端和地之间。 逆变器,反馈电阻和电容器形成自激振荡器来驱动压电变压器,使得压电变压器产生高压输出。 由于变频器,反馈电阻和电容器体积小,重量轻,高压发生器整体也小,薄,轻。
    • 10. 发明授权
    • Semiconductor device that converts input direct current voltage to regulated output voltage by intermittently switching on and off the input direct current voltage
    • 通过间歇地接通和关断输入直流电压将输入直流电压转换成稳压输出电压的半导体器件
    • US08335097B2
    • 2012-12-18
    • US12816686
    • 2010-06-16
    • Tetsuji Yamashita
    • Tetsuji Yamashita
    • H02M7/44H02M3/335
    • H02M3/33507H02M2001/0032Y02B70/16
    • A semiconductor device providing a control circuit for controlling a switching power supply apparatus includes: an intermittent-oscillation control circuit which outputs an enable signal providing instructions to execute and suspend switching alternately; a turn-on control circuit which changes between an execution state and a suspension state of the switching according to the enable signal, and outputs, only in the execution state, a turn-on signal which turns on the switching element with a switching period; and an intermittent-oscillation frequency control circuit which causes the turn-on control circuit to delay the changing between the execution state and the suspension state so that an intermittence period including periods during which the turn-on control circuit is in the execution state and the turn-on control circuit is in the suspension state falls outside of a specific time range. Intermittent oscillation is thus operated out of a specific frequency band within an audible frequency range.
    • 提供用于控制开关电源装置的控制电路的半导体装置包括:间歇振荡控制电路,其输出提供执行和交替切换指令的使能信号; 导通控制电路,其根据使能信号在执行状态和切换的暂停状态之间变化,并且仅在执行状态下输出以开关周期接通开关元件的导通信号; 以及间歇振荡频率控制电路,其使得导通控制电路延迟执行状态和暂停状态之间的变化,使得包括导通控制电路处于执行状态的周期的间歇周期和 导通控制电路处于暂停状态,超出特定时间范围。 因此,在可听频率范围内的特定频带内进行间歇振荡。