公开(公告)号：US11088666B2

公开(公告)日：2021-08-10

申请号：US16411449

申请日：2019-05-14

Applicant: Microchip Technology Incorporated

Inventor： Keith Edwin Curtis ,  Ward Brown ,  John Charais ,  Steve Kennelly ,  Dave Suda ,  Huamin Zhou ,  Clark Rogers ,  Mudit Gupta

IPC: H03F3/45

Abstract: An operational amplifier with totem pole connected output transistors having inputs coupled to multiplexers for selectable coupling of signals and voltage levels thereto. The high and low output transistors may be forced hard on or hard off in addition to normal coupling of signals thereto. The operation of the output transistors may be dynamically changed to pass only positive going signals, negative going signals, placed in a tristate high impedance state, hard connected to a supply voltage and/or hard connected to supply common return. A core independent peripheral (CIP) may also be coupled to the operational amplifier for dynamically changing the multiplexer inputs in real time, as can external control signals to a control circuit coupled to the multiplexers.

公开(公告)号：US20140176119A1

公开(公告)日：2014-06-26

申请号：US14135351

申请日：2013-12-19

Applicant: Microchip Technology Incorporated

Inventor： Richard Hull ,  John Charais ,  Gabriel Rosca

IPC: G01R19/175

CPC classification number: G01R19/175

Abstract: A mains voltage zero-crossing detector has a constant voltage forced on an external node by driving transistor devices with appropriate control signals provided by a feedback loop around a highly power efficient class B configuration comprising an operational amplifier having single ended dual outputs and a class B control circuit. Mains power zero crossings may then be detected by monitoring the drive current of devices driven by this amplifier. Wherein Class B control and current mode detection provide accurate detection of the driven signal without depending on any voltage threshold that may depend on temperature, process fabrication and/or supply voltage.

Abstract translation: 电源电压过零检测器通过驱动晶体管器件，通过由反馈环路提供的适当的控制信号强制在外部节点上施加恒定电压，所述反馈环路围绕高功率有效的B类配置，包括具有单端双输出的运算放大器和B类 控制电路。 然后可以通过监视由该放大器驱动的器件的驱动电流来检测市电电源过零点。 其中B类控制和电流模式检测提供对驱动信号的精确检测，而不依赖于可能取决于温度，工艺制造和/或电源电压的任何电压阈值。

公开(公告)号：US09404948B2

公开(公告)日：2016-08-02

申请号：US14135351

申请日：2013-12-19

Applicant: Microchip Technology Incorporated

Inventor： Richard Hull ,  John Charais ,  Gabriel Rosca

IPC: G01R19/175 ,  H03K5/1536

CPC classification number: G01R19/175

Abstract: A mains voltage zero-crossing detector has a constant voltage forced on an external node by driving transistor devices with appropriate control signals provided by a feedback loop around a highly power efficient class B configuration comprising an operational amplifier having single ended dual outputs and a class B control circuit. Mains power zero crossings may then be detected by monitoring the drive current of devices driven by this amplifier. Wherein Class B control and current mode detection provide accurate detection of the driven signal without depending on any voltage threshold that may depend on temperature, process fabrication and/or supply voltage.

Abstract translation: 电源电压过零检测器通过驱动晶体管器件，通过由反馈环路提供的适当的控制信号强制在外部节点上施加恒定电压，所述反馈环路围绕高功率有效的B类配置，包括具有单端双输出的运算放大器和B类 控制电路。 然后可以通过监视由该放大器驱动的器件的驱动电流来检测市电电源过零点。 其中B类控制和电流模式检测提供对驱动信号的精确检测，而不依赖于可能取决于温度，工艺制造和/或电源电压的任何电压阈值。