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    • 1. 发明授权
    • DC/DC converter and television using same
    • DC / DC转换器和电视机使用相同
    • US08830405B2
    • 2014-09-09
    • US13413833
    • 2012-03-07
    • Kazuhiro Murakami
    • Kazuhiro Murakami
    • H04N5/63
    • H02M3/156H02M2001/0022H04N5/63
    • A DC/DC converter 10 has a high-side transistor QH as a switching element and a low-side transistor QL as a synchronous rectifier element. A first primary electrode D and secondary primary electrode S of the high-side transistor QH are connected to an input voltage VIN and an external terminal T1, respectively. A detection transistor QD is provided in a row with the high-side transistor QH, and the ON voltage of the high-side transistor QH when ON is output as detection voltage VQD from the detection transistor QD. The output detection voltage VQD is added to a feedback voltage VFB1 by an adder CB, and inputted to a comparator CMP1. The ON period of a one-shot pulse PS1 outputted from the comparator CMP1 is regulated so as to be in direct proportion to the sum of the detection voltage VQD and the feedback voltage VFB1.
    • DC / DC转换器10具有作为开关元件的高侧晶体管QH和作为同步整流元件的低侧晶体管QL。 高侧晶体管QH的第一初级电极D和次级主电极S分别连接到输入电压VIN和外部端子T1。 检测晶体管QD与高侧晶体管QH成一行地设置,并且当从检测晶体管QD输出ON作为检测电压VQD时,高侧晶体管QH的导通电压。 输出检测电压VQD由加法器CB加到反馈电压VFB1,并输入到比较器CMP1。 从比较器CMP1输出的单触发脉冲PS1的导通期间被调整为与检测电压VQD和反馈电压VFB1的和成正比。
    • 2. 发明申请
    • OVERVOLTAGE PROTECTION CIRCUIT, POWER SUPPLY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, ELECTRONIC DEVICE AND TELEVISION SET
    • 过电压保护电路,电源装置,液晶显示装置,电子装置和电视机
    • US20140146426A1
    • 2014-05-29
    • US14129582
    • 2012-06-11
    • Kazuhiro Murakami
    • Kazuhiro Murakami
    • G02F1/1362H02H9/04
    • G02F1/136204H01L27/0251H02H9/043H03K19/00315
    • An overvoltage protection portion (14) includes a transistor (P1) that achieves continuity with an input voltage (VIN) used as an output voltage (VOUT) to an internal circuit when the input voltage (VIN) applied to an external terminal (T1) is not in an overvoltage state. The overvoltage protection portion (14) also includes: a transistor (P2) operating as a short circuit that short-circuits the source and the gate of the transistor (P1) and that interrupts the input voltage (VIN) when the input voltage (VIN) is in the overvoltage state; a resistor (R2); and a Zener diode (ZD1). The overvoltage protection portion (14) also includes: a transistor (NTr1) operating as a bypass circuit that supplies a constant output voltage (VOUT) from the external terminal (T1) to the internal circuit when the input voltage (VIN) is brought into the overvoltage state; a resistor (R3); and a Zener diode (ZD2).
    • 过电压保护部分(14)包括晶体管(P1),当施加到外部端子(T1)的输入电压(VIN)时,晶体管(P1)实现与用作内部电路的输出电压(VOUT)的输入电压(VIN) 不处于过电压状态。 过电压保护部分(14)还包括:作为短路的晶体管(P2),其在输入电压(VIN)时短路晶体管(P1)的源极和栅极并且中断输入电压(VIN) )处于过电压状态; 电阻器(R2); 和齐纳二极管(ZD1)。 过电压保护部分(14)还包括:当输入电压(VIN)进入时,作为旁路电路工作的晶体管(NTr1),其将外部端子(T1)的恒定输出电压(VOUT)提供给内部电路 过电压状态; 电阻器(R3); 和齐纳二极管(ZD2)。