チョッパ回路に関する研究

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This study has been done for establishing analytical theory and design method of a chopper circuit that is a kind of D. C. amplifiers.　This paper cosists of seven chapters and an appendix.　In chapter 1, introduction, chopper circuits are compared with conventional D. C. amplifiers in regard to every characteristics and the fields utilizing effectively chopper circuits are clarified. The purpose and the summary of this study are described in this chapter.　In chapter 2, is described the approximate solution of chopper circuits which have larger time constants than chopper's switching period; general formulas are obtained by using the special characteristics of chopper's terminal voltage and current, and by using the approximation of circuit impedances. The frequency response and so on are easily obtained by inserting elements of Y-matrix of chopper circuits in to the general formulas. Characteristics of each fundamental circuit are investigated in detail and the most suitable contact ratio of choppers at which the gain of chopper amplifiers changes scarcely is obtained by using the general formulas. The error of the approximate solution is also investigated with experiments.　In chapter 3, is first described the performance calculation for chopper circuits comprising two choppers at least of which the performance can not be analysed independently. The performance calculation is obtained by using the products of chopper's characteristic functions and the analytical method used in chapter 2. The performance calculation is available for analysing balanced modulating circuits or chopper amplifiers with negative feedback, and coincides closely with experimental values. The differential type of a wide-band chopper amplifier is described next and is the one which broadens the freqency band width withou tmaking a switchinig frequency higher and by increasing the nurnber of a mechanical chopper. The analysis and the design method of the differential type is also given in this chapter.　In chapter 4, is described the precice analysis of chopper circuits. The general successive formulas of chopper circuits are obtained by the concept of T transform or modified Laplace transform and give the precice values of chopper's terminal voltages. Initial values at each switching period is not neccesary for using the successive formulas, so the chopper's terminal voltages may be easily calculated by the successive formluas. The precice solution coincides with the approximate solution if the time contsants of chopper circuits are sufficiently large. The stability criterion can be obtained by the precice solution.　In chapter 5, it is described how negative feedback has influence on the characteristics of chopper circuits. It is shown by the theory and the experiment that higher harmonics generated in the demodulating circuits of the conventional chopper amplifiers do not change and higher harmonics of the wide-band chopper amplifiers can be sufficiently decreased by negative feedback. The upper limit of negative feedback is obtained by the precice solution for the sake of the design of chopper amplifiers with negtive feedback. It is clarified that a circuit which is considered as stable in general may be unstable with specialmechanism of oscillation. The upper limit of negativefeedback of the complex circuits considered as hard to be calculated by the theory, is obtained by the experiment.
山形大学の論文
1966-01-14

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