公开(公告)号：US09600006B2

公开(公告)日：2017-03-21

申请号：US15000683

申请日：2016-01-19

Applicant: Seiko Instruments Inc.

Inventor： Tadashi Kurozo ,  Takao Nakashimo ,  Michiyasu Deguchi

IPC: G05F1/569 ,  G05F1/571 ,  G05F1/00 ,  H02H7/00 ,  H02H9/00 ,  G05F1/573

CPC classification number: G05F1/569 ,  G05F1/573

Abstract: Provided is a voltage regulator having a simple circuit configuration in which a protection circuit is not erroneously operated, and delay time of activation of the protection circuit is short. The voltage regulator includes: a protection circuit configured to control an output transistor when an abnormality of the voltage regulator is detected; a first constant current circuit configured to supply operating current to the protection circuit; and a detection circuit configured to detect output current flowing through the output transistor, to thereby control the first constant current circuit. The detection circuit is further configured to detect the output current with a predetermined reference current value. The protection circuit is further configured to control the output transistor so that the output current does not fall below the reference current value.

公开(公告)号：US09323258B2

公开(公告)日：2016-04-26

申请号：US14639681

申请日：2015-03-05

Applicant: Seiko Instruments Inc.

Inventor： Takao Nakashimo ,  Tadashi Kurozo

IPC: G05F1/569 ,  G05F1/10 ,  G05F1/56 ,  G05F1/575 ,  H02M1/32

CPC classification number: G05F1/10 ,  G05F1/56 ,  G05F1/575 ,  H02M1/32

Abstract: Provided is a voltage regulator that is low in current consumption and is capable of suppressing the occurrence of an excessive overshoot at an output terminal when a power supply voltage becomes high in a non-regulated state. The voltage regulator includes: an overshoot limiting circuit for detecting an occurrence of an overshoot in an output voltage and limiting a current of the output transistor; and a non-regulated state detection circuit for detecting a non-regulated state of the voltage regulator based on a voltage of an output terminal and a current flowing through the output transistor. The overshoot limiting circuit has an operating current controlled by a detection signal of the non-regulated state detection circuit.

Abstract translation: 提供一种电流消耗低的电压调节器，并且能够抑制在非调节状态下电源电压变高时输出端子发生过大的过冲。 电压调节器包括：过冲限制电路，用于检测输出电压中的过冲的发生并限制输出晶体管的电流; 以及非调节状态检测电路，用于基于输出端子的电压和流过输出晶体管的电流来检测电压调节器的非调节状态。 过冲限制电路具有由非调节状态检测电路的检测信号控制的工作电流。

公开(公告)号：US10061335B2

公开(公告)日：2018-08-28

申请号：US14287999

申请日：2014-05-27

Applicant: Seiko Instruments Inc.

Inventor： Tadashi Kurozo ,  Tomoyuki Yokoyama

IPC: H02M1/08 ,  G05F1/575

CPC classification number: G05F1/575

Abstract: Provided is a voltage regulator having satisfactory transient response characteristics. The voltage regulator includes: a first amplifier for detecting that undershoot occurs in an output voltage; a second amplifier for detecting that overshoot occurs in the output voltage; a first constant current circuit for increasing a bias current of an error amplifier circuit by a first amount for a first time period in response to a signal determined based on one of an output signal of the first amplifier and an output signal of the second amplifier; a second constant current circuit for increasing the bias current of the error amplifier circuit by a second amount larger than the first amount for a second time period shorter than the first time period in response to a signal determined based on the output signal of the first amplifier; and a first switch circuit for pulling up a gate of an output transistor in response to a signal determined based on the output signal of the second amplifier.