公开(公告)号：US20100165527A1

公开(公告)日：2010-07-01

申请号：US12627729

申请日：2009-11-30

Applicant: Michael James Callahan, JR.

Inventor： Michael James Callahan, JR.

IPC: H02H3/00 ,  G01R31/08

CPC classification number: G01R19/16571 ,  H03K17/0826

Abstract: A bi-directional protection circuit employs a single comparator for detecting fault conditions. Diodes are coupled between a detection node and voltage dividers setting references for inverting and non-inverting comparator inputs, each diode forward biased during one of the positive and negative halves of the alternating current input signal cycle and coupling the detection node to a respective one of the inverting and non-inverting comparator inputs, and reverse biased during the other of the positive and negative halves and decoupling the detection node from the other of the inverting and non-inverting comparator inputs. Upon an overcurrent condition during the positive half, a voltage at the inverting comparator input is drawn above the reference voltage at the non-inverting input. Upon an overcurrent condition during the negative half, a voltage at the non-inverting comparator input is drawn below the reference voltage at the inverting input.

Abstract translation: 双向保护电路采用单个比较器来检测故障状况。 二极管耦合在检测节点和分压器之间，用于设置反相和非反相比较器输入的参考值，每个二极管在交流输入信号周期的正半周和负半周期期间正向偏置，并将检测节点耦合到 反相和非反相比较器输入，并在正半周和负半周中的另一个反向偏置，并将检测节点与反相和非反相比较器输入中的另一个去耦。 在正半周期的过电流条件下，反相比较器输入端的电压在非反相输入端上被吸引到基准电压之上。 在负半周期的过电流条件下，非反相比较器输入端的电压被拉低到反相输入端的参考电压以下。