公开(公告)号：WO1991009467A1

公开(公告)日：1991-06-27

申请号：PCT/US1990006561

申请日：1990-11-08

Applicant: SUNDSTRAND CORPORATION

Inventor： SUNDSTRAND CORPORATION ,  LATOS, Thomas, S. ,  WINGATE, Kevin, L.

IPC: H03K17/687

CPC classification number: H03K17/567 ,  H03K17/162

Abstract: Previous drives for insulated gate devices had undesirably low noise immunity. This advantage is overcome by a circuit providing improved noise immunity having a first transistor (10) including power terminals and a gate, the power terminals being connected to a power supply and to a load, and the gate being connected to receive control pulses from a pulse source (26) for turning the first transistor (10) on and off. A second transistor (44) has power terminals connected across the gate and one power terminal of the first transistor (10), and a gate connected to a varying voltage circuit (42, 43). This varying voltage circuit (42, 43) provides a voltage on the gate of the second transistor (44) which varies in proportion to the spacing between the control pulses and turns on the second transistor (44) when the spacing is greater than a preset value. The pulse source (26) charges the varying voltage circuit (42, 43) during normal operation and the charge turns off the second transistor (44). During inactivity of the pulse source (26) for a preset time period, the varying voltage circuit (42, 43) changes to the level where the second transistor (44) turns on and shunts the first transistor (10), thereby preventing the first transistor (10) from being turned on by noise signals.

Abstract translation: 用于绝缘栅极器件的先前驱动器具有不期望的低噪声抗扰度。 通过提供改进的抗噪声性的电路克服了这个优点，该电路具有包括电源端子和栅极的第一晶体管（10），电源端子连接到电源和负载，并且栅极被连接以从 用于使第一晶体管（10）接通和断开的脉冲源（26）。 第二晶体管（44）具有连接在第一晶体管（10）的栅极和一个电源端子之间的电源端子，以及连接到变化电压电路（42,43）的栅极。 这个变化的电压电路（42,43）在第二晶体管（44）的栅极上提供一个电压，当第二晶体管（44）的间隔大于预设值时，该电压与第二晶体管（44）之间的间隔成比例地变化， 值。 脉冲源（26）在正常操作期间对变化的电压电路（42,43）充电，并且电荷关断第二晶体管（44）。 在脉冲源（26）处于预置时间段的不活动状态期间，变化电压电路（42,43）变为第二晶体管（44）导通的电平，并分流第一晶体管（10），从而防止第一晶体管 晶体管（10）不被噪声信号导通。