公开(公告)号：US20160191104A1

公开(公告)日：2016-06-30

申请号：US14585281

申请日：2014-12-30

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： CHEN KOK YEOH ,  FRIEDRICH JOSEF BOLLMANN ,  GENG XIANG LEE @ TITUS LEE ,  JOO YIH SEE

IPC: H04B1/40 ,  H03F1/52 ,  H03F3/21 ,  H03F3/183

CPC classification number: H03F3/183 ,  H03F1/52 ,  H03F1/523 ,  H03F3/185 ,  H03F3/21 ,  H03F3/2171 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/432

Abstract: An intrinsically safe audio power circuit includes redundant electronic fuses disposed between the power input of an audio power amplifier and the battery source of the portable two-way radio device. The electronic fuse circuits are connected in series with each other, and each electronic fuse circuit includes a series switch transistor that can shut off the flow of current between the battery and the audio power amplifier. Each electronic fuse circuit also includes a current sense portion, and when the current through the electronic fuse circuits reaches a current threshold, it will shut off its series switch transistor using an active bias circuit in order to ensure sufficiently rapid shut off.

Abstract translation: 本质安全的音频电源电路包括设置在音频功率放大器的电源输入和便携式双向无线电设备的电池源之间的冗余电子保险丝。 电子熔丝电路彼此串联连接，并且每个电子熔丝电路包括可以截止电池和音频功率放大器之间的电流的串联开关晶体管。 每个电子熔丝电路还包括电流感测部分，并且当通过电子熔丝电路的电流达到电流阈值时，它将使用有源偏置电路来切断其串联开关晶体管，以确保充分快速的切断。