公开(公告)号：US09219352B2

公开(公告)日：2015-12-22

申请号：US14165406

申请日：2014-01-27

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chi-Hua Lin ,  Chien-Fu Tang ,  Isaac Y. Chen ,  An-Tung Chen

IPC: H02B1/24 ,  H04R3/00

CPC classification number: H02B1/24 ,  H04R3/007 ,  Y10T307/74 ,  Y10T307/766

Abstract: A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system.

Abstract translation: 断电延迟电路包括连接在外部电源输入端子和内部电源端子之间的开关，连接到内部电源端子的电容器和滞后比较器，用于根据外部电力输入端子的电压来切换开关 和内部电源端子。 在接通时，外部电源输入端子连接到内部电源端子，电容器可以通过外部电源充电。 当开关关闭时，电容为内部电路提供电力。 将断电延迟电路应用于音频系统可以消除音频系统的关闭声音。

公开(公告)号：US09276473B1

公开(公告)日：2016-03-01

申请号：US14591250

申请日：2015-01-07

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： An-Tung Chen ,  Li-Wen Fang ,  Chih-Hao Yang ,  Yu-Chiao Hsieh

IPC: G05F1/00 ,  H02M3/158

CPC classification number: H02M3/158 ,  H02M3/156 ,  H02M3/1588 ,  H02M2001/0022 ,  Y02B70/1466

Abstract: A voltage converting controller is applied to a switching voltage converting circuit, in which the voltage converting controller periodically operates a high-side power switch and a low-side power switch in the switching voltage converting circuit with a high-side control signal and a low-side control signal, respectively, so as to convert an input voltage into an output voltage via an inductor. Defining an ideal duty cycle as the rating value of the output voltage divided by the value of the input voltage, when the ideal duty cycle is less than one threshold duty cycle, then the period of the high-side control signal is a constant; and when the ideal duty cycle is greater than the threshold duty cycle, the period of the high-side control signal and the period of the ideal duty cycle are positively correlated.

Abstract translation: 电压转换控制器被应用于开关电压转换电路，其中电压转换控制器周期性地操作具有高侧控制信号和低电平的开关电压转换电路中的高侧电源开关和低侧电源开关 控制信号，以便通过电感将输入电压转换为输出电压。 将理想的占空比定义为输出电压的额定值除以输入电压的值，当理想占空比小于一个阈值占空比时，则高边控制信号的周期为常数; 并且当理想占空比大于阈值占空比时，高侧控制信号的周期和理想占空比的周期是正相关的。

公开(公告)号：US20160043627A1

公开(公告)日：2016-02-11

申请号：US14529111

申请日：2014-10-30

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： An-Tung Chen ,  Li-Wen Fang ,  Chih-Hao Yang

IPC: H02M1/32 ,  H02M1/088 ,  H02M3/158

CPC classification number: H02M3/1584 ,  H02M2001/0045

Abstract: An over-voltage protection circuit is applied to a switching voltage converting circuit. The switching voltage converting circuit manipulates an upper bridge power switch in the circuit, so as to convert an input voltage into an output voltage by an inductor. A channel of the upper bridge power switch and the inductor are coupled to a phase end. The over-voltage protection circuit includes: a comparator, coupled to the switching voltage converting circuit, wherein when a voltage of the phase end is higher than a voltage limiting threshold, an output end of the comparator outputs a first voltage level; and a pulse width detection unit, coupled to the output end of the comparator, wherein when the output end of the comparator remains the first voltage level for a time period longer than a protection period, the pulse width detection unit outputs an over-voltage protection activation signal.

Abstract translation: 过电压保护电路被施加到开关电压转换电路。 开关电压转换电路操纵电路中的上桥式电源开关，以便通过电感将输入电压转换为输出电压。 上桥电源开关和电感器的通道耦合到相端。 所述过电压保护电路包括：比较器，耦合到所述开关电压转换电路，其中当所述相位端的电压高于电压限制阈值时，所述比较器的输出端输出第一电压电平; 以及脉冲宽度检测单元，其连接到所述比较器的输出端，其中当所述比较器的输出端在比保护周期长的时间段内保持第一电压电平时，所述脉冲宽度检测单元输出过电压保护 激活信号。

公开(公告)号：US09356518B2

公开(公告)日：2016-05-31

申请号：US14529111

申请日：2014-10-30

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： An-Tung Chen ,  Li-Wen Fang ,  Chih-Hao Yang

IPC: H02M3/158 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/1584 ,  H02M2001/0045

Abstract: An over-voltage protection circuit is applied to a switching voltage converting circuit. The switching voltage converting circuit manipulates an upper bridge power switch in the circuit, so as to convert an input voltage into an output voltage by an inductor. A channel of the upper bridge power switch and the inductor are coupled to a phase end. The over-voltage protection circuit includes: a comparator, coupled to the switching voltage converting circuit, wherein when a voltage of the phase end is higher than a voltage limiting threshold, an output end of the comparator outputs a first voltage level; and a pulse width detection unit, coupled to the output end of the comparator, wherein when the output end of the comparator remains the first voltage level for a time period longer than a protection period, the pulse width detection unit outputs an over-voltage protection activation signal.

Abstract translation: 过电压保护电路被施加到开关电压转换电路。 开关电压转换电路操纵电路中的上桥式电源开关，以便通过电感将输入电压转换为输出电压。 上桥电源开关和电感器的通道耦合到相端。 所述过电压保护电路包括：比较器，耦合到所述开关电压转换电路，其中当所述相位端的电压高于电压限制阈值时，所述比较器的输出端输出第一电压电平; 以及脉冲宽度检测单元，其连接到所述比较器的输出端，其中当所述比较器的输出端在比保护周期长的时间段内保持第一电压电平时，所述脉冲宽度检测单元输出过电压保护 激活信号。

公开(公告)号：US20150042393A1

公开(公告)日：2015-02-12

申请号：US14078928

申请日：2013-11-13

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： An-Tung Chen ,  Chien-Liang Kuo ,  Jo Yu Wang ,  Kuo-Chung Lee

IPC: H03K19/017 ,  H03K19/0185 ,  H03K3/356

CPC classification number: H03K19/017 ,  H03K3/356104 ,  H03K19/018507

Abstract: A level shifter includes an input stage circuit, a latch circuit and a transient speed-up circuit. The input stage circuit receives an input signal. The latch circuit is coupled to the input stage circuit through a first output terminal and a second output terminal, and determining steady-state levels of the first and the second output terminals according to the input signal. The transient speed-up circuit is coupled to the first and the second output terminals. When the transient speed-up circuit determines the first and the second output terminals are at the same logic level, the transient speed-up circuit accelerates the positive edge transition of the first or the second terminals.

Abstract translation: 电平移位器包括输入级电路，锁存电路和瞬态加速电路。 输入级电路接收输入信号。 锁存电路通过第一输出端和第二输出端耦合到输入级电路，并根据输入信号确定第一和第二输出端的稳态电平。 瞬态加速电路耦合到第一和第二输出端。 当瞬态加速电路确定第一和第二输出端子处于相同的逻辑电平时，瞬态加速电路加速第一或第二端子的正沿转变。

公开(公告)号：US08952741B1

公开(公告)日：2015-02-10

申请号：US14078928

申请日：2013-11-13

Applicant: Richtek Technology Corp

Inventor： An-Tung Chen ,  Chien-Liang Kuo ,  Jo Yu Wang ,  Kuo-Chung Lee

IPC: H03L5/00 ,  H03K19/017 ,  H03K3/356 ,  H03K19/0185

CPC classification number: H03K19/017 ,  H03K3/356104 ,  H03K19/018507

Abstract: A level shifter includes an input stage circuit, a latch circuit and a transient speed-up circuit. The input stage circuit receives an input signal. The latch circuit is coupled to the input stage circuit through a first output terminal and a second output terminal, and determining steady-state levels of the first and the second output terminals according to the input signal. The transient speed-up circuit is coupled to the first and the second output terminals. When the transient speed-up circuit determines the first and the second output terminals are at the same logic level, the transient speed-up circuit accelerates the positive edge transition of the first or the second terminals.

Abstract translation: 电平移位器包括输入级电路，锁存电路和瞬态加速电路。 输入级电路接收输入信号。 锁存电路通过第一输出端和第二输出端耦合到输入级电路，并根据输入信号确定第一和第二输出端的稳态电平。 瞬态加速电路耦合到第一和第二输出端。 当瞬态加速电路确定第一和第二输出端子处于相同的逻辑电平时，瞬态加速电路加速第一或第二端子的正沿转变。