- 专利标题: Utility ground detection
-
申请号: US15920307申请日: 2018-03-13
-
公开(公告)号: US10656196B2公开(公告)日: 2020-05-19
- 发明人: Albert Flack , Scott Garret Berman
- 申请人: Webasto Charging Systems, Inc.
- 申请人地址: US CA Monrovia
- 专利权人: Webasto Charging Systems, Inc.
- 当前专利权人: Webasto Charging Systems, Inc.
- 当前专利权人地址: US CA Monrovia
- 代理商 Christopher R. Balzan, Esq.; Eric J. Aagaard, Esq.
- 主分类号: G01R31/02
- IPC分类号: G01R31/02 ; H02H5/10
摘要:
In an embodiment, a missing utility ground detection circuit includes a pair of balanced resistors each connected to receive utility voltage from a different one of a pair of utility power lines, the balanced resistors being connected together at a summing node to be capable of summing the voltages from the pair of utility power lines. It includes an unbalance resistor connected to shunt voltage from one of the utility power lines. It has a summing amplifier with an input coupled to the summing node and to a reference voltage, and an input coupled to a second reference voltage. It has an averaging circuit connected at the output of the summing amplifier. A comparator is provided having an input connected to the averaging circuit an input connected to a threshold voltage.
公开/授权文献
- US20180275186A1 UTILITY GROUND DETECTION 公开/授权日:2018-09-27