公开(公告)号：US20160099644A1

公开(公告)日：2016-04-07

申请号：US14968002

申请日：2015-12-14

Applicant: Seiko Instruments Inc.

Inventor： Toshiyuki TSUZAKI

IPC: H02M3/158 ,  H02M1/32

CPC classification number: G05F1/573 ,  G05F1/575 ,  H02M1/32

Abstract: Provided is a voltage regulator in which an output current can be controlled stably and accurately to an overcurrent protection set value without the need of providing a phase compensation circuit including an element having a large area. The voltage regulator includes a constant voltage control circuit including: a first differential amplifier circuit for comparing a first reference voltage and a feedback voltage to each other; and an output transistor to be controlled by an output voltage of the first differential amplifier circuit, and an overcurrent protective circuit including: a resistor for measuring the output current; a second differential amplifier circuit for measuring a difference between voltages at both terminals of the resistor; a comparator for comparing an output voltage of the second differential amplifier circuit and a second reference voltage to each other; and a switch to be controlled by a detection signal of the comparator. When the output current equal to or larger than an overcurrent protection set value flows, the output voltage of the second differential amplifier circuit is input to the first differential amplifier circuit via the switch, to thereby switch control of the output transistor from control based on the constant voltage control circuit to control based on the overcurrent protective circuit.

Abstract translation: 提供一种电压调节器，其中可以将输出电流稳定且精确地控制为过电流保护设定值，而不需要提供包括具有大面积的元件的相位补偿电路。 电压调节器包括：恒压控制电路，包括：第一差分放大器电路，用于将第一参考电压和反馈电压彼此进行比较; 以及由第一差分放大器电路的输出电压控制的输出晶体管，以及过电流保护电路，包括：用于测量输出电流的电阻; 用于测量电阻器两端的电压差的第二差分放大器电路; 比较器，用于将第二差分放大器电路的输出电压和第二参考电压彼此进行比较; 以及由比较器的检测信号控制的开关。 当流过等于或大于过电流保护设定值的输出电流时，第二差分放大电路的输出电压经由开关输入到第一差分放大电路，从而基于输出晶体管的控制切换输出晶体管的控制 恒压控制电路根据过电流保护电路进行控制。

公开(公告)号：US20140240042A1

公开(公告)日：2014-08-28

申请号：US14190862

申请日：2014-02-26

Applicant: Seiko Instruments Inc.

Inventor： Toshiyuki TSUZAKI

IPC: H03F3/45

CPC classification number: H03F3/45 ,  H03F1/52 ,  H03F3/45475 ,  H03F2200/441 ,  H03F2203/45101 ,  H03F2203/45604 ,  H03F2203/45616

Abstract: There is provided an operational amplifier capable of detecting that an input terminal has been open circuited without restricting the voltage range of an input signal. The operational amplifier includes a first comparator which detects that an inverting input terminal of an operational amplifier has been open circuited, a second comparator which detects that a non-inverting input terminal of the operational amplifier has been open circuited, a first resistor and a first switch which are controlled by output signals of the first comparator and the second comparator and which are connected in series between the non-inverting input terminal and a ground terminal of the operational amplifier, and a second resistor and a second switch which are connected in series between the inverting input terminal and a supply terminal of the operational amplifier.

Abstract translation: 提供了一种能够检测输入端已经断开而没有限制输入信号的电压范围的运算放大器。 运算放大器包括检测运算放大器的反相输入端已经断开的第一比较器，检测运算放大器的非反相输入端已经断开的第二比较器，第一电阻和第一 开关，其由第一比较器和第二比较器的输出信号控制，并串联连接在运算放大器的非反相输入端子和接地端子之间，第二电阻器和第二开关串联连接 在反相输入端子和运算放大器的电源端子之间。

公开(公告)号：US20160105113A1

公开(公告)日：2016-04-14

申请号：US14969688

申请日：2015-12-15

Applicant: Seiko Instruments Inc.

Inventor： Toshiyuki TSUZAKI ,  Tadashi KUROZO ,  Manabu FUJIMURA

IPC: H02M3/158

CPC classification number: H02M3/158 ,  G05F1/571 ,  G05F1/573 ,  H02M1/32

Abstract: Provided is a voltage regulator capable of stably suppressing overshoot. The voltage regulator includes a non-regulated state detection circuit for detecting a non-regulated state, and an overshoot suppression circuit. The overshoot suppression circuit is configured to operate when the non-regulated state detection circuit detects the non-regulated state.

Abstract translation: 提供能够稳定地抑制过冲的电压调节器。 电压调节器包括用于检测非调节状态的非调节状态检测电路和过冲抑制电路。 超调抑制电路被配置为在非调节状态检测电路检测到非调节状态时动作。