发明名称 |
Method and circuit for measuring a current |
摘要 |
A method and circuit arrangement for measuring a current are described, which can be used in electrical engineering to precisely trigger electronic tripping devices in circuit breakers. The current is measured according to magnitude and phase in such a way that only the fundamental wave of the current between precisely determined current zero crossings is sampled at a low sampling rate, and the root mean square is calculated on the basis of the measured phase angle and amplitude. The exact phase angle is measured using a conventional PLL circuit with a downstream zero switch.
|
申请公布号 |
US6617858(B1) |
申请公布日期 |
2003.09.09 |
申请号 |
US20010674882 |
申请日期 |
2001.01.29 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
BAUMGAERTL ULRICH;ROEHL WOLFGANG;HOCHGRAEF HOLGER |
分类号 |
G01R19/25;H02H1/00;(IPC1-7):G01R31/08 |
主分类号 |
G01R19/25 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|