Current transformer terminated by active load elements for providing phase-inverted signals
阅读：506发布：2021-10-23
专利汇可以提供Current transformer terminated by active load elements for providing phase-inverted signals专利检索，专利查询，专利分析的服务。并且The secondary winding of a current transformer is terminated in a virtual short-circuit condition by a pair of active load elements, such as transresistance amplifiers, which provide, for example, a pair of phase-inverted output voltages proportional to current in the primary winding of the current transformer.，下面是Current transformer terminated by active load elements for providing phase-inverted signals专利的具体信息内容。
1. In combination: a current transformer having primary and secondary windings; and, a pair of transresistance amplifiers, each having inverting and non-inverting input terminals as well as an output terminal, the inverting input terminals of said pair of amplifiers being connected to different ends of said secondary winding and the non-inverting input terminals of said pair of amplifiers being commonly connected, each amplifier having a relatively low input impedance, said inverting and non-inverting input terminals of said pair of transresistance amplifiers having substantially the same potential thereat.
2. The combination set forth in claim 1 wherein said secoNdary winding includes a center tap and wherein said non-inverting terminals are commonly connected to said center tap.
3. The combination set forth in claim 1 further comprising a pair of oppositely poled diodes connected in parallel with each other and with said secondary winding.
4. The combination set forth in claim 1 wherein said pair of amplifiers are substantially identical, electrically.
5. The combination set forth in claim 2 wherein said pair of amplifiers are substantially identical, electrically.
6. In combination: a current transformer having primary and secondary windings; a pair of operational amplifiers, each having inverting and non-inverting input terminals as well as an output terminal, the inverting input terminals of said pair of amplifers being connected to different ends of said secondary winding and the non-inverting terminals of said pair of amplifiers being commonly connected; and, a pair of feedback impedances, each being connected in parallel with a different one of said amplifiers between an inverting input and output terminal thereof, said inverting and non-inverting terminals of each amplifier having substantially the same potential thereat.
7. The combination set forth in claim 6 wherein said secondary winding includes a center tap and wherein said non-inverting terminals are commonly connected with said center tap.
8. The combination set forth in claim 6 further comprising a pair of oppositely poled diodes connected in parallel with each other and with said secondary winding.
9. The combination set forth in claim 6 wherein said pair of amplifiers are substantially identical, electrically.
10. In combination: a current transformer having primary and secondary windings adapted for conducting primary and secondary current, respectively; a pair of operational amplifiers, each having inverting and non-inverting input terminals, between which there is substantially no difference of potential, and an output terminal, the inverting input terminals of said pair of amplifiers being connected to different ends of said secondary winding and the non-inverting input terminals being commonly connected so that said secondary winding is terminated in a virtual short circuit; and, a pair of feedback impedances, each being connected in parallel with a different one of said amplifiers between an inverting and output terminal thereof, said pair of amplifiers producing between the output terminals thereof and the commonly connected non-inverting terminals thereof a pair of output voltages in response to current in said secondary winding, said output voltages being proportional to current in the primary winding.
11. The combination set forth in claim 10 wherein said secondary winding includes a center tap and wherein said commonly connected non-inverting terminals are connected to said center tap.
12. The combination set forth in claim 10 wherein said pair of output voltages are phase-displaced relative to each other.
13. The combination set forth in claim 12 wherein said output voltages are 180* out of phase.
14. The combination set forth in claim 11 wherein said pair of output voltages are phase-displaced relative to each other.
15. The combination set forth in claim 14 wherein said output voltages are 180* out of phase.
16. The combinatin set forth in claim 10 wherein said pair of amplifiers are substantially identical, electrically.
17. The combination set forth in claim 16 wherein said pair of amplifiers are operable in their linear ranges.
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