Circuit for the detection of an asymmetry in the magnetization current of a magnetic modulator
US4912396A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Oct 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/185
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Circuit for detection of an asymmetry in the magnetization current, generated by a reference alternating voltage, in a magnetic modulator, in particular a magnetic modulator for zero-flux detection. This magnetic modulator comprises two virtually identical, wound magnet cores (T2, T3), each with a primary winding (W1) to be fed with a modulating current (i.sub.1) and a series circuit of an auxiliary winding (W3) and an impedance (Z2, Z3) across which a voltage proportional to the magnetization current arises during operation. The reference alternating voltage (U.sub.m) is fed to the respective series circuits (W3, Z2; W3, Z3) such that no resultant induction current is induced in the modulating current (i.sub.1). The voltages over the impedances (Z2, Z3) form input signals for two peak value detectors (PD1, PD2), the strength of the output signal of which represents the degree of asymmetry of magnetization current. For processing the output signals of the two peak value detectors (PD1, PD2), devices (D) are provided which produce a virtually ripple-free output signal in the case of a symmetrical magnetization current. The invention also relates to a measurement circuit for the accu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.