Analysis and design of stator terminals reversal connection detector for Synchro-to-Digital converter
In this paper, a stator terminals reversal connection detector is presented for Synchro-to-Digital Converter (SDC). This is useful for identifying inadvertent reversal connection of synchro output signals to SDC. Synchro is a positional sensor excited by a sinusoidal signal and gives three electrical signals. The zero crossing outputs of synchro and a clock based on synchro excitation signal are generated. Then the phase relationship between excitation and synchro output signals is analyzed for possible stator terminal reversal connections between synchro and SDC. This method uses simple electronic components such as operational amplifiers, monoshots and flip flops. The analysis, implementation and experimental results are presented.
Synchro-to-Digital Converter Using Digital Peak Detection Method
— A simple and low cost digital peak detection based Synchro to Digital Converter (SDC) is presented. It is based on a combined analog and digital circuit, which gives the shaft angle of a synchro in a digital form. The proposed method is applied to a synchro transmitter. The paper presents the generation of resolver format signals from a synchro transmitter using electronic scott-T circuit and count for the corresponding scott-T output signals using digital peak detectors. The associated scott-T output signal count enables the determination of mechanical angle for complete 360 0 shaft rotation. The theory of operation, circuit details, computer simulation, and experimental results are presented. Synchro stator terminals V os , V oc Electronic scott-T circuit output signals D 1 , D 2 Digital peak detectors L 1 , L 2 Latching circuits rs 1 , rs 2 reset signals ls 1 , ls 2 latching signals x 0-x 9 10-bit digital data corresponding to peak amplitude of V os y 0-y 9 10-bit digital data corresponding to peak amplitude of V oc Q 0 , Q 1 Quadrant selector output bits
The monotonicity of the threshold detection probability in a stochastic accumulation process
Abstract In this paper we prove for a number of distributions that the probability for the value of the sum of the first k (but not before) of i.i.d.r.v. to exceed a given value A is monotonically increasing in the range k ∗ ( or k ∗ + 1 ) where k ∗ = max k such that kμ ≤A. We conjecture that this monotonicity property is preserved for a much larger family of distribution functions than those examined in the paper.